CA2264173A1 - Integrated controller pump - Google Patents
Integrated controller pump Download PDFInfo
- Publication number
- CA2264173A1 CA2264173A1 CA002264173A CA2264173A CA2264173A1 CA 2264173 A1 CA2264173 A1 CA 2264173A1 CA 002264173 A CA002264173 A CA 002264173A CA 2264173 A CA2264173 A CA 2264173A CA 2264173 A1 CA2264173 A1 CA 2264173A1
- Authority
- CA
- Canada
- Prior art keywords
- pump
- recited
- rotor
- fluid
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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- 230000005355 Hall effect Effects 0.000 claims abstract description 6
- 238000010438 heat treatment Methods 0.000 claims description 62
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- 230000007613 environmental effect Effects 0.000 claims description 9
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- 238000011156 evaluation Methods 0.000 claims description 7
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- 238000006731 degradation reaction Methods 0.000 description 2
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- 238000010348 incorporation Methods 0.000 description 1
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- 230000037431 insertion Effects 0.000 description 1
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0606—Canned motor pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D13/00—Pumping installations or systems
- F04D13/02—Units comprising pumps and their driving means
- F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
- F04D13/0686—Mechanical details of the pump control unit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
- F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
- F24D19/00—Details
- F24D19/10—Arrangement or mounting of control or safety devices
- F24D19/1006—Arrangement or mounting of control or safety devices for water heating systems
- F24D19/1009—Arrangement or mounting of control or safety devices for water heating systems for central heating
- F24D19/1012—Arrangement or mounting of control or safety devices for water heating systems for central heating by regulating the speed of a pump
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2203/00—Motor parameters
- F04B2203/02—Motor parameters of rotating electric motors
- F04B2203/0209—Rotational speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B2207/00—External parameters
- F04B2207/03—External temperature
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2211/00—Specific aspects not provided for in the other groups of this subclass relating to measuring or protective devices or electric components
- H02K2211/03—Machines characterised by circuit boards, e.g. pcb
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
- H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
- H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/22—Auxiliary parts of casings not covered by groups H02K5/06-H02K5/20, e.g. shaped to form connection boxes or terminal boxes
- H02K5/225—Terminal boxes or connection arrangements
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
A d.c. controller pump (28) includes electronic control mechanisms that permit regulated control within a fluid flow system. A pump head (34) is coupled to a housing (40) allowing the fluid to infiltrate the region surrounding a permanent magnet rotor (52). Stator windings (70) and control electronics fixed to a plurality of printed circuit boards (72, 74, 76) are isolated from the fluid by means of a solid body (62) that encapsulates the stator windings and seals the rear of the cavity. Hall effect sensor-generators (71) and other assemblies are fixed within the solid body to enhance integrity and reduce parts count. Associated electronics include a readily-removable circuit board (76) for housing auxiliary electronic functions. The board is mounted in parallel at the rear of the pump housing with boards of sensor and controller electronics. The auxiliary function electronics pump configurations enable both fixed and variable speed operation in accordance with fluid flow system design and parameters.
Description
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Title: INTEGRATED CONTROLLER PUMP
TECHNICAL FIELD
The present invention relates to apparatus
suitable for regulating fluid flow. More particularly,
this invention relates to a programmable
pump/controller.
BACKGROUND ART
A compact pump is disclosed in United States
patents of Servain et al. entitled "Pump Assembly With
Integral Electronically Commutated Drive System"
(Serial No. 5,096,390) and "Integral Electronically
Commutated Drive System" (Serial No. 5,197,865). The
device of those patents discloses a magnetically
torque-coupled pump that includes a number of
advantageous features. It offers the advantages of an
integrated assembly in which the pump drive shaft is
coextensive with the shaft of the rotor of the
associated electrical drive motor. As such, and in
contrast to pumps of the "direct drive" type, it does
not require dynamic or motor bearing seals that are
known to impose excessive frictional loading and thus
reduce useful life through contamination and seal
failure. Finally, the disclosed pump is desirably
brushless, eliminating the need for a spring-biased
contact that could otherwise act as a source of
intermittent failure.
While offering compactness and freedom from
bearing-induced friction, the integration of pump and
motor requires structures dedicated to preventing
damage to electronic components through the migration
of fluid into areas left "unprotected" by the absence
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of such bearing seals. Pump complexity and cost is
thereby increased through the multiplication of parts
requiring assembly and maintenance which add potential
sources of failure.
Pumps of the aboveâdescribed type are
employed in numerous systems and applications. Some
useful applications are found in the fields of
facilities management, process control and like
technologies. A representative use for a pump of the
aboveâdescribed or similar type is illustrated in
Figure 1, a schematic View of a radiant heating system
in which a flow of heated water is supplied to a panel
10 for controlling temperature within a building.
Referring to the prior art radiant heating
system of Figure 1, optimum operation for efficiency
and economy of use requires that the flow throughout
the closed system take into account multiple factors.
While such factors may vary from one specific
application to another, one advantageous protocol takes
into account the temperature of water heated by means
of a boiler 12 that circulates within the piping 14 of
a primary heating circuit 16. A useful point for
ascertaining such variable in the system of Figure 1,
and thereby locating an appropriate sensor, is adjacent
the tee joint 18. Another critical point in the system
of Figure 1 lies at the tee joint 20 located at the
interface between the primary heating circuit 16 and
the piping 22 of a secondary heating circuit 24 that
includes the radiant heating panel 10. A third sensor
may be appropriately located outside the building for
measuring ambient temperature.
Optimum efficiency within the above protocol
requires continual consideration and review of the
various sensor outputs. For example, it may be
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inefficient for any flow of heated fluid to occur from
the primary heating circuit 16 into the secondary
heating circuit 24 before the boiler 12 has
sufficiently heated the fluid.
Conventionally, systems of the above type,
as well as much more complex systems, are regulated by
means of a constant-speed pump 26 that may act in
conjunction with a calibrated venturi valve 27 for
setting associated gate valves whereby the flow rate is
Such
arrangements are quite expensive in terms of hardware
adjustable to maintain a desired temperature.
as the cost of the calibrated venturi valve may be at
least equal to that of a pump 26 such as the device of
the aboveâreferenced patents. Further, additional time
and expense may be incurred in adjusting the venturi
valve 27 for cooperature utilization with the pump 26.
DISCLOSURE OF THE INVENTION
The foregoing and other shortcomings of the
prior art are addressed by the present invention that
provides,
in a first aspect, an integrated d.c.
controller pump. Such pump includes a pump head having
spaced-apart inlet and outlet ports and means for
A solid body
A rotor is
fixed to the means for controlling fluid flow. Such
controlling a flow of fluid therebetween.
of generally-cylindrical shape is provided.
rotor includes a plurality of radiallyâarranged
permanent magnets.
The body has a closed coaxial interior
cylindrical chamber adapted to receive the rotor. A
stator is encapsulated within the body.
In a second aspect, the invention provides
an integrated d.c. controller pump that includes a pump
head having spacedâapart inlet and outlet ports and
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means for controlling a flow of fluid therebetween. A
substantially cylindrical rotor is fixed to the means
for controlling fluid flow. The rotor includes a
plurality of radially-arrayed permanent magnets.
A stator includes a plurality of windings.
The stator is coaxial with the cylindrical surface of
the rotor. Means are provided in communication with
the rotor and with the stator windings for sensing at
least one predetermined variable and generating a
responsive d.c. signal so that the speed of rotation of
the rotor is adjustable in accordance with a
predetermined protocol.
In a third aspect, the invention provides an
improvement in a radiant heating system of the type
that includes a boiler for heating fluid circulating
within a first closed conduit defining a primary
heating circuit and a second closed conduit defining a
secondary heating circuit. The secondary heating
circuit includes at least one radiant heating panel. A
third conduit defines a fluid flow path between the
primary and secondary heating circuits. Means are
provided for sensing at least one predetermined
environmental variable.
The improvement of the invention includes a
variable speed d.c. pump located within the third
conduit for regulating the flow of fluid from the
primary heating circuit into the secondary heating
circuit. The d.c. pump includes a rotor and at least
one stator winding arranged to induce rotation. Means
for regulating the flow of fluid through the pump is
fixed to the rotor. Means are provided for sensing the
speed of the rotor.
The pump includes (i) means for sensing the
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values of the speed of rotation and of at least one
predetermined environmental variable, (ii) means for
inputting an evaluation criterion and (iii) means for
receiving the aforesaid values and evaluation criterion
and generating a d.c. control signal in response for
application to the windings so that the speed of
rotation is continually adjustable in response to at
least one sensed value and the evaluation criterion.
In a fourth aspect, the invention provides
an improvement in a closed multi-station fluid flow
system of the type that includes a plurality of lines
A
predetermined flow rate is apportioned between the
joined to common return and feed lines.
plurality of lines with a maximum rate associated with
each.
The improvement provided by this aspect of
the invention includes a variable speed d.c. pump
located in each of the plurality of lines for
regulating the flow of fluid therein. Each of the d.c.
pumps includes a rotor and at least one stator winding
arranged to induce rotation. Means for regulating the
flow of fluid through the pump are fixed to the rotor.
Means are provided for sensing the speed of the rotor
and the value of current flow within the stator
winding(s).
Each of the pumps includes (i) means for
receiving the sensed values of speed of rotation and
stator current, (ii) means for inputting the value of
the maximum flow rate and (iii) means for generating a
d.c. control signal in response to the sensed values
and the value of maximum flow rate for application to
the stator windings so that the speed of the rotor is
continuously adjustable in response to flow conditions
throughout the fluid flow system in such a way that the
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maximum flow rate of each line is not exceeded.
The preceding and other features and
advantages of the present invention will become further
apparent from the detailed discussion that follows.
Such discussion is accompanied by a set of drawing
figures. Numerals of the drawing figures,
corresponding to those of the written text, point to
the features of the invention with like numerals
referring to like features throughout both the drawing
figures and the written text.
BRIEF DESCRIPTION OF DRAWINGS
Figure 1 is a schematic diagram of a radiant
heating system for a structure in accordance with the
prior art;
Figure 2 is a perspective view of a metering
pump in accordance to the invention engaged within a
fluid flow conduit;
Figure 3 is a side elevation view in cross-
section of the metering pump of the invention taken at
line 3-3 of Figure 2;
Figure 4 is an exploded perspective view of
the metering pump of the invention:
Figure 5 is an electrical schematic diagram
of the electronics located upon the auxiliary function
board of the invention configured for use as a
controller within the radiant heating system as
illustrated in Figure 1;
Figure 6 is a graph illustrating
representative heating curves for incorporation into an
operational protocol of the radiant heating system of
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Figure 1:
Figure 7 is a schematic diagram of a multi-
station fluid flow system configured to include a
plurality of metering flow pumps in accordance with the
invention:
Figure 8 is an electrical schematic diagram
of the auxiliary function board of a metering pump
configured for use in the multi-station fluid flow
system of Figure 7: and
Figure 9 is a perspective view of the
invention generally in accordance with Figure 2 for
illustrating the ready removal and substitution of
auxiliary function board electronics for facilitating
setup and operational flexibility.
BEST MODE FOR CARRYING OUT THE INVENTION
Figure 2 is a perspective View of a metering
pump 28 in accordance with the invention engaged for
use within a fluid flow conduit comprising an inlet
line 30 and an outlet line 32. Each of the inlet and
outlet lines 30 and 32 is affixed to and communicates
with the interior of a pump head 34. The pump head 34
may house any of a number of well-known types of pump
mechanisms whereby a controllable flow of fluid through
the lines 30 and 32 is obtained by operation of the
pump mechanism upon the fluid as it passes between
spaced-apart inlet and outlet ports 36 and 38.
Numerous well-recognized types of pump mechanisms may
be employed in accordance with the present invention
including, for example, centrifugal pumps, vane pumps,
gear pumps, etc.
A controllable motor mechanism is
incorporated within the metering pump 28 of the
....................m.u, . ., . , v
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invention. It will be seen later that the controllable
nature of the integrated pump-motor mechanism permits
its advantageous employment within numerous fluid flow
systems. While impossible to enumerate in their
entireties, systems incorporating a metering pump 28 in
accordance with the invention may benefit from the
flexibility of the electronic servo system
configurations provided by the invention. In general,
such closed-loop or servoed operation of the pump 28 is
obtained by "reading" the real time performance of the
pump from measurable parameters such as motor speed m
and stator current Is, then adjusting pump output by
updating electrical inputs to the motor. The motor,
and, thus, the pump 28, is programmable, permitting it
to be selectively configured for a number of different
desired modes of operation.
The motor and associated electronics are
located within a cylindrical housing 40. The rear of
the housing 40 is closed by means of a cap 42 having an
associated connector 44. The cap 42 is engageable to a
circular printed circuit board that houses electronic
functions unique to the present invention. The
electronics of the adjacent circuit board interact with
otherwise-conventional pump electronics suitable for
constant speed operation. The contribution of the
additional electronic capabilities to the operation of
the present invention will become further apparent from
the discussion that follows.
Figure 3 is a side elevation View in cross-
section of the metering pump 28 of the invention taken
at line 3-3 of Figure 2 while Figure 4 is a somewhat-
simplified exploded perspective view. Taken together,
the two views disclose the essential mechanical
structures and relationships of the elements of the
metering pump 28.
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A stationary shaft 46 is press-fit into a
central hub 48 of the pump head 34. The shaft 46 is
rotatably received within a central bore 50 of a
generally-cylindrical rotor 52. An impeller 54,
comprising a plurality of radial1yâdirected vanes 56,
is fixed to the end of the rotor, which may be
fabricated of molded NYLON or other nonmagnetic
material.
A plurality of permanent magnet dipoles,
such as the representative magnet 58, is fixed about
the periphery of the rotor 52. The magnets may
comprise, for example, barium ferrite material with
appropriate encapsulation and sheathing. The rotor 52
with peripheral magnets is received within a
cylindrical cavity 60 defined at the interior of a
solid body 62. The body 62, which is sealably fixed to
the pump head 34 by means of an oâring 64, is
preferably formed of EPOXY and offers a number of
features that provide significant operational and
manufacturing advantages over other inductively-driven
motor-pumps such as those taught by the above-defined
United States patents. By virtue of its cylindrical
exterior, integral nonmagnetic composition and
accommodation of a central cylindrical closed cavity
60, the solid body 62 effectively fills the section
within the housing 40 dedicated to the
electromechanical motor-pump mechanisms with the
exception of (1) the rotor 52, including associated
permanent magnets such as the representative magnet 58,
and (2) the small (about 1/64 inch) clearance that
exists between the exterior surface of the rotor 52 and
the interior surface of the cylindrical closed cavity
60.
The clearance between rotor 52 and the
interior of the body 62 is filled with fluid during
. ..l..........,.........e..-.. . .,
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operation of the pump due to the absence of the dynamic
bearing seals, motor shaft bearings or shaft seals that
introduce friction in motors of the direct and magnet
drive types. As such, the central cylindrical closed
cavity 60 of the body 62 effectively contains the fluid
that necessarily infiltrates into regions adjacent
electronic elements and interconnections. A discussion
of such elements, including means for driving the rotor
52, sensing motor speed and other variables and
powering and controlling the metering motor will
follow. In each instance it will become apparent that
the design and arrangement of the solid body 62 serves
an essential function in providing a means for
preserving the integrity of such essential electronic
elements while at the same time simplifying
fabrication, lowering maintenance, enhancing resistance
to environmental degradation and thereby providing a
pump of greater reliability and economy. For example,
the pump of the referenced United States patents
employs a metallic cup-like enclosure for sealing
system electronics from fluid infiltration. The
resultant structure is less sturdy and durable than the
present device in which the solid body 62 provides
encapsulation -âand, thus, environmental isolationâ- of
sensitive electronics, reduces parts count as the
molded piece is designed to incorporate a number of
functions of separate parts of prior art pumps, and
removes a metallic element that can act as a source of
distorting eddy currents.
Referring once again to Figures 3 and 4, a
stator 66 comprising laminations 68 and a
representative coil or winding 70, is positioned about
the periphery of the central cylindrical cavity 60 and
encapsulated within the solid body 62. This is to be
contrasted with prior art devices in which the stator
is arranged exterior to the above-referenced metallic
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cup and thereby exposed to free space and attendant
environmental effects such as vibration. Complex
mounting arrangements of the patented device require
that the stator laminations fill the space between the
interior of the pump housing and the outer surface of
the cup. In contrast, the molded piece 62 provides an
EPOXY matrix in which the stator is located and
suitably positioned. The dimensioning of the solid
body 62 replaces that of the referenced device insofar
as securing a stable structural fit within the
electromechanical section of the metering pump 28.
Thus, the dimensions of the stator of the present
invention may be chosen solely in accordance with
desired motor performance and independent of the
configuration of the other elements of the device.
In a preferred embodiment, an even number of
stator windings (e.g. six) is employed to prevent
asymmetrical side loading of the permanent magnet rotor
52. A plurality of more than two of stator windings is
employed to assure unambiguous control of sense of
rotation. Further, the number of permanent magnet
dipoles of the rotor 52 should differ from the number
of stators to assure that simultaneous alignment of
rotor poles and stator windings can never occur.
A plurality of Hall effect generators, such
as the representative generator 71, are symmetrically
arranged with respect to the axis of rotation of the
rotor 52. Each generator or sensor 71 is fitted and
securely mounted within the molded piece 62 and
appropriately positioned for measuring the angular
position of the rotor. The sensors are wired together
to generate a series of pulses (TACH signal) indicative
of the speed of rotation. The operation of such
sensors, as well as their application to the
measurement of speed of rotation of a rotor within a
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switching electrical field, are well understood by
those skilled in the art.
In the present invention, the accuracy of
the useful outputs of the Hall effect sensor-generators
is enhanced by their positioning within the solid body
62. As in the case of the stator referred to above,
encapsulation simplifies and enhances the accuracy of
mounting arrangements and protects the sensors from
mechanical degradation due to the presence of such
environmental factors as stress, dew deposition and
vibration that can produce corrosion, mechanical
misalignment and other effects that degrade the
reliabilities of sensed outputs. In addition, by
providing a metallic cup enclosure to contain fluid
infiltration and arranging sensors outside the cup,
sensor readings in a device in accordance with the
prior art patents are subject to the generation of
signalâdistorting eddy currents at the surface of the
metallic cup. In contrast, the molded EPOXY
composition of the solid body 62 provides a
nonconductive region of wellâdefined parameters
incapable of corrupting sensor output.
The outputs of, and inputs to, the stator
and sensors for driving and controlling the operation
of the invention are provided by means of electronic
circuitry mounted upon circular circuit boards 72, 74
and 76 mounted concentrically within the housing 40 at
annular shoulders 78 and 80. A board 76 that provides
auxiliary functions which enable the pump 28 to act as
a controller is fixed to the cover 42 in spacedâapart
relationship, maintained by a peripheral edge flange
82.
Figure 5 is an electrical schematic diagram
of the electronics of the auxiliary function board 76
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of the invention. Such electronics is configured for
use as a controller within the radiant heating system
of Figure 1. The single pump 28 replaces both the
constant speed pump 26 and the calibrated venturi 27 of
the prior art configuration. As in the case of the
former elements, the pump 28 is located within the line
connecting the primary heating circuit 16 to the
secondary heating circuit 24 adjacent the common tee
20. Electronics fixed to the circuit boards 72 and 74
perform the recognized functions common to a constant-
speed inductively-driven pump including control of the
excitation of stator windings, motor speed control,
power supply and sensing of rotor speed and position.
Such functions are taught, for example, in and with
reference to the device of the above-cited United
States patents.
In the present invention, electronics
mounted upon the removable auxiliary function board 76
enables the pump 28 to control the output of the
radiant heating panel 10 in such a way as to conform to
a predetermined profile or curve such as that of the
graph of Figure 6. The orthogonal axes of the graph of
Figure 7 relate exterior temperature to that of water
circulating in the secondary heating circuit 24, it
being understood that the ultimate output of the system
is the temperature of the radiantly heated interior of
the building.
Three heating curves 84, 86 and 88 are
plotted on the graph of Figure 6. Each of such curves
plots a fixed ratio between the measured temperatures
of the fluid of the secondary heating circuit and of
the exterior. As shown, ratios of 0.5 (heating curve
84), 1.0 (heating curve 86) and 2.0 (heating curve 88)
are plotted. (It is understood that each of the
heating devices 84, 86 and 88 is calibrated with
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reference to the structure in question. As the
ultimate output of the system of Figure 1 is the
temperature of the interior of the structure, each
heating curve produces a distinct, predictable interior
temperature.)
It is well known that the temperature of
water circulating within the secondary heating circuit
24 is a positive function of both the temperature of
the water heated by the boiler 12 (and circulating in
the primary heating circuit 16) and the rate of flow of
fluid, Q. Referring to the schematic of the auxiliary
function electronics of Figure 5 in conjunction with
the graph of Figure 6, one may appreciate the manner in
which the auxiliary function electronics allows the
pump 28 of the invention to control the radiant heating
system of Figure 1.
Numerous system measurements, generated and
received through the conventional electronics of the
circuit boards 72 and 74, are input to a multiplexer
integrated circuit 90 which may comprise a Model 14051
manufactured by Motorola Corporation. Such inputs
include the TACH signal, discussed above, that
comprises a series of pulses responsive to the speed of
rotation of the rotor 52 (generated from the outputs of
the Hall effect generators), linearized values of the
measured resistances of thermistors 92, 94 and 96
arranged to sense primary heating circuit, common tee
(or "blend point") and exterior temperatures and
settable values of potentiometers 98, 100 and 102
respectively. The latter three values relate to the
graph of Figure 6 and are, of course, obtained from
devices external to the pump 28. The value of the
potentiometer 98 corresponds to a predetermined minimal
temperature of the boiler-heated water in the primary
circuit 16 for operation of the metering pump 28. The
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setting of the potentiometer 100 defines the slope of
and thereby selects the desired heating curve of Figure
6 while the potentiometer 102 provides manual override.
When the potentiometer 102 is set to its maximum value,
this is interpreted at a microcontroller 104 as an
instruction that the control strategy for regulating
the operation of the pump 28 is to be with reference to
the blend point temperature (i.e. the temperature
indicated by the thermistor 94), the outside
temperature (the value indicated at the thermistor 96)
and the selected heating curve (indicated by the
setting of the potentiometer 100). Alternatively,
should the potentiometer 102 be set to some other, non-
maximum resistance value, that value, rather one taken
from the heating curve, is the reference temperature to
which the water fluid circulating in the secondary
heating circuit 24 is regulated. Obviously, the
resultant radiantlyâheated temperature of the structure
will, in the first instance, tend to remain constant
while, in the latter instance, it will tend to mirror
fluctuations in outdoor temperature.
The values input to the multiplexer 90 are
sequentially applied to a timing capacitor 106 with the
resultant charge accumulation time applied to a timer
within the microcontroller 104 which may comprise, for
example, a PICl6C62A RISC computer manufactured by
Microchip Corp. The values input to the
microcontroller 104 may be viewed on a display 108
whose content is controlled via sequential depression
of a switch 110. Both the display 108 and the switch
110 are fixed to the exterior surface of the cap 42 to
permit access and visibility while the pump 28 is in
use. The microcontroller 106, which is capable of
performing thirty-three unique instructions, provides a
pulse width modulated signal that is converted to d.c.
at a filter 112. The resultant CMD ("command") signal
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comprises a d.c. level that affects the speed of
switching between the stators of the threeâphase motor.
This signal varies the speed of rotation of the rotor
52 to alter the flow rate Q in such a way that the
measured temperature of the fluid flowing within the
secondary heating circuit 24 is driven toward the
appropriate reference value. As mentioned, the
temperature reference is programmed into the pump 28 by
the setting of the manual override potentiometer 102.
Thus, in contrast to the prior art arrangement of
Figure 1, the speed of the pump 28 is varied so that
the ultimate system output (structure heating), rather
than motor speed, is tracked. such capability, a
feature of the invention made possible by the
electronics of the auxiliary function board 76, enables
one to regulate the output of a system in accordance
with Figure 1 without incurring the expense of an
additional element (i.e. calibrated venturi). Thus,
the invention provides a simple and elegant system
controller for a radiant heating system.
The controller pump of the invention enables
additional advantages that overcome significant
problems commonly encountered in fluid flow systems.
Figure 7 is a schematic diagram of a multi-station
fluid flow system configured to include a plurality of
metering flow pumps in accordance with the invention.
The fluid flow system consists of a
plurality of parallel lines 114, 116,...1l8 with shared
return and feed lines 120, 122. Each of the parallel
lines of the system may be employed, for example, to
deliver a flow of fluid to an associated output or
utilization device 124, 126,...128. The system of
Figure 7 may be employed to control flows within a
large structure or over an area including a number of
structures.
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Often, a closed fluid flow network such as
that illustrated in Figure 7 will require the
maintenance of differing maximum flow rates within the
various parallel lines. In the prior art, such a
system conventionally employs a single pump for
circulating the fluid and individual valves and
regulators within each line for independently adjusting
flows therein. The setting of the various maximum flow
rates may take weeks in a complex system due to the
interactions inherent in any closed system. As a
result, substantial "downtime" is often encountered in
the setup of a new system of the type disclosed in
Figure 7.
Rather than employing a single heavyâduty
pump in conjunction with a plurality of settable valves
and restrictors, each of the lines 114, 116,...120
includes a single control element, a pump in accordance
with the invention. Each of such pumps 130, 132,...l34
is programmed for automatically regulating the maximum
flow rate through the associated line. Thus, by
appropriately programming each pump, one may be assured
that blockages and other flow aberrations that may
occur over time will not render the entire system out
of calibration and thereby require, as in the case of
prior art systems, significant downtime while it is re-
calibrated.
Figure 8 is a schematic diagram of the
auxiliary function board of a metering pump configured
for use in the multi-station fluid flow system of
Figure 7. The reconfiguration of the auxiliary
function board can be seen to involve the inputting of
an amplified value of Is, the stator current. The value
of Is, conventionally measured for controlling a
constantâspeed motor and therefore made available
through the electronics of the circuit boards 72 and
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74, is amplified at an operational amplifier 136 and
provided as an input to the multiplexer 90. (While a
number of the inputs for use in the radiant heating
system according to Figure 1 are shown in Figure 7,
only two, the TACH signal and Qmx (determined by the
setting of a potentiometer 138), are relevant to the
control of the multi-station device of Figure 7.)
As discussed with reference to the operation
of the circuitry of Figure 5, the values of the TACH
signal and Is are output from the multiplexer 90 and
subsequentially input to the microcontroller 104 as
timed values derived from charging of the capacitor
106. It is readily understood from Euler's impeller
equations that the flow rate Q output by a motor such
as that of the current invention is a function of
stator current and motor speed. More specifically:
Q = (Kt/I-âY) (Is/f(<=>r))
where: Kt = motor torque
r = outside radius of impeller
y = density of fluid
(I)
= motor speed
As the values of Kt, r, and y are constants
which may be programmed into the microcontroller 104,
and as the TACH signal provides a measure of w, each of
the pumps 130, l32,...134 continuously receives all
necessary information for outputting an appropriate CMD
signal so that the preset Qmw of any motor of the
arrangement of Figure 7 will not be exceeded regardless
of changes that may occur throughout the system over
time.
Figure 9 is a perspective view of the pump
28, taken from the rear and generally in accordance
with Figure 2. This view illustrates the arrangements
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of the invention that facilitate ready conversion of
the pump 28 to constant speed applications, enhancing
the flexibility of the device. As mentioned earlier,
the requisite electronics for obtaining the necessary
motor outputs and deriving responsive signals for the
multitude of constant-speed uses to which the pump 28
may be applied are mounted solely upon the printed
circuit boards 72 and 74. Such electronics may
include, for example, a brushless d.c. motor controller
such as that commercially available from Motorola Corp.
under product designation MC 33035.
As mentioned earlier, the auxiliary function
electronics is mounted exclusively upon the circuit
board 76 that is mounted adjacent and abutting the rear
cap 42. Posts 140, 142 extend parallel to the axis of
rotation of the cylindrical housing 40 and pass through
internal apertures 144, 146 respectively of the circuit
board 76. A like pair of apertures (not shown) in the
cap 42 are aligned therewith. The posts 140, 142 are
hollow and internally threaded to receive fasteners
148, 150 through such apertures in the cap 42. As
earlier pointed out, a peripheral edge flange 82
maintains predetermined spacing between the surface of
the board 76 and the cap 42. The aforesaid structure
enables the user to convert the motor 28 between
constant and variable speed operations in a simple and
rapid manner involving the selective insertion or
removal of the auxiliary function board 76. Likewise,
the pump 28 may be distributed in both variable speed
and constant speed versions, affording a uniformity of
elements and structures that permits simplified
logistical support and, thus enhances product
maintenance.
While this invention has been described with
reference to its presentlyâpreferred embodiment, it is
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not limited thereto. Rather, the invention is limited
only insofar as it is described by the following set of
patent claims and includes within its scope all
equivalents thereof.
20
Claims (29)
1. An integrated d.c. controller pump comprising, in combination:
a) a pump head having spaced-apart inlet and outlet ports and means for controlling a flow of fluid therebetween;
b) a solid body of generally-cylindrical shape;
c) a rotor fixed to said means for controlling fluid flow, said rotor including a plurality of radially-arrayed permanent magnets;
d) said body having a closed coaxial interior cylindrical chamber adapted to receive said rotor; and e) a stator encapsulated within said body.
a) a pump head having spaced-apart inlet and outlet ports and means for controlling a flow of fluid therebetween;
b) a solid body of generally-cylindrical shape;
c) a rotor fixed to said means for controlling fluid flow, said rotor including a plurality of radially-arrayed permanent magnets;
d) said body having a closed coaxial interior cylindrical chamber adapted to receive said rotor; and e) a stator encapsulated within said body.
2. A pump as recited in Claim 1 wherein said stator further includes:
a) a plurality of windings; and b) said windings are arranged adjacent the surface of said interior cylindrical chamber.
a) a plurality of windings; and b) said windings are arranged adjacent the surface of said interior cylindrical chamber.
3. A pump as defined in Claim 1 wherein said solid body is of molded nonconductive, nonmagnetic material.
4. A pump as recited in Claim 3 wherein said solid body is of molded EPOXY fabrication.
5. A pump as recited in Claim 1 further comprising:
a) a hollow cylindrical housing; and b) the exterior surface of said solid body contacts the interior surface of said housing throughout the length of said body.
a) a hollow cylindrical housing; and b) the exterior surface of said solid body contacts the interior surface of said housing throughout the length of said body.
6. A pump as recited in Claim 5 further comprising:
a) at least one board having electronic circuitry mounted thereon;
b) said at least one board being located within a rear section of said housing; and c) the closed end of said solid body being intermediate said pump head and said at least one board.
a) at least one board having electronic circuitry mounted thereon;
b) said at least one board being located within a rear section of said housing; and c) the closed end of said solid body being intermediate said pump head and said at least one board.
7. A pump as recited in Claim 6 further comprising:
a) a plurality of boards located within said rear section of said housing;
b) one of said boards including electronic circuitry for generating a signal for adjusting the speed of said pump in accordance with a predetermined protocol; and c) an end cap for fixation to and closure of the rear of said housing; and d) said last-named board being located adjacent said cap.
a) a plurality of boards located within said rear section of said housing;
b) one of said boards including electronic circuitry for generating a signal for adjusting the speed of said pump in accordance with a predetermined protocol; and c) an end cap for fixation to and closure of the rear of said housing; and d) said last-named board being located adjacent said cap.
8. A pump as recited in Claim 7 wherein said boards are mounted in parallel to one another within said rear section of said housing.
9. A pump as recited in Claim 1 further including a plurality of rotor motion sensors fixed within said solid body.
10. An integrated d.c. controller pump comprising, in combination:
a) a pump head having spaced-apart inlet and outlet ports and means for controlling a flow of fluid therebetween;
b) a substantially cylindrical rotor fixed to said means for controlling fluid flow, said rotor including a plurality of radially-arrayed permanent magnets;
c) a stator including a plurality of windings, said stator being coaxial with the cylindrical surface of said rotor; and d) means in communication with said rotor and said stator windings for sensing at least one predetermined variable and generating a responsive d.c.
signal so that the speed of rotation of said rotor is adjustable in accordance with a predetermined protocol.
a) a pump head having spaced-apart inlet and outlet ports and means for controlling a flow of fluid therebetween;
b) a substantially cylindrical rotor fixed to said means for controlling fluid flow, said rotor including a plurality of radially-arrayed permanent magnets;
c) a stator including a plurality of windings, said stator being coaxial with the cylindrical surface of said rotor; and d) means in communication with said rotor and said stator windings for sensing at least one predetermined variable and generating a responsive d.c.
signal so that the speed of rotation of said rotor is adjustable in accordance with a predetermined protocol.
11. A pump as recited in Claim 10 wherein said means is fixed to a circuit board.
12. A pump as recited in Claim 11 further including:
a) a cylindrical housing;
b) a plurality of circuit boards; and c) said means is fixed to the circuit board located at the rear of said housing.
a) a cylindrical housing;
b) a plurality of circuit boards; and c) said means is fixed to the circuit board located at the rear of said housing.
13. A pump as recited in Claim 10 wherein said means further includes:
a) means for continuously receiving the value of at least one operational variable of said pump;
b) means for setting the value of at least one performance parameter; and c) means for receiving the values of said at least one variable and parameter and generating a pump control signal in response thereto.
a) means for continuously receiving the value of at least one operational variable of said pump;
b) means for setting the value of at least one performance parameter; and c) means for receiving the values of said at least one variable and parameter and generating a pump control signal in response thereto.
14. A pump as recited in Claim 13 wherein said pump control signal is applied to said plurality of stator windings.
15. A pump as recited in Claim 14 further including:
a) a plurality of Hall effect generators for sensing angular rotor position; and b) said generators provide said at least one operational variable.
a) a plurality of Hall effect generators for sensing angular rotor position; and b) said generators provide said at least one operational variable.
16. A pump as recited in Claim 15 wherein each means for setting a performance parameter comprises a potentiometer.
17. A pump as recited in Claim 16 further including:
a) a closed cylindrical solid body of molded nonconductive material having an interior cylindrical chamber; and b) said stator windings being encapsulated within said solid body.
a) a closed cylindrical solid body of molded nonconductive material having an interior cylindrical chamber; and b) said stator windings being encapsulated within said solid body.
18. A pump as defined in Claim 17 wherein said windings are arrayed radially adjacent the surface of said interior cylindrical chamber.
19. A pump as defined in Claim 18 wherein said generators are fixed within said solid body.
20. In a radiant heating system of the type that includes a boiler for heating fluid within a first closed conduit defining a primary heating circuit, a second closed conduit defining a secondary heating circuit including at least one radiant heating panel, a third conduit defining a fluid flow path between said primary and secondary heating circuits and means for sensing at least one predetermined environmental variable, the improvement comprising, in combination:
a) a variable speed d.c. pump located within said third conduit for regulating the flow of fluid from said primary heating circuit into said secondary heating circuit;
b) said d.c. pump including a rotor and at least one stator winding arranged to induce rotation thereof;
c) means for regulating the flow of fluid through said pump fixed to said rotor;
d) means for sensing the speed of said rotor; and e) said pump further including (i) means for sensing the values of said speed of rotation and of said at least one predetermined environmental variable, (ii) means for inputting an evaluation criterion and (iii) means for receiving said values and said evaluation criterion and generating a d.c. control signal in response thereto for application to said windings so that the speed of rotation of said rotor is continuously adjustable in response to said at least one sensed value and evaluation criterion.
a) a variable speed d.c. pump located within said third conduit for regulating the flow of fluid from said primary heating circuit into said secondary heating circuit;
b) said d.c. pump including a rotor and at least one stator winding arranged to induce rotation thereof;
c) means for regulating the flow of fluid through said pump fixed to said rotor;
d) means for sensing the speed of said rotor; and e) said pump further including (i) means for sensing the values of said speed of rotation and of said at least one predetermined environmental variable, (ii) means for inputting an evaluation criterion and (iii) means for receiving said values and said evaluation criterion and generating a d.c. control signal in response thereto for application to said windings so that the speed of rotation of said rotor is continuously adjustable in response to said at least one sensed value and evaluation criterion.
21. A radiant heating system as recited in Claim 20 further characterized in that:
a) said means for sensing comprises a plurality of Hall effect generators:
b) said means for inputting an evaluation criterion comprises a plurality of potentiometers; and c) said means for generating a d.c.
control signal comprises a microcontroller.
a) said means for sensing comprises a plurality of Hall effect generators:
b) said means for inputting an evaluation criterion comprises a plurality of potentiometers; and c) said means for generating a d.c.
control signal comprises a microcontroller.
22. A radiant heating system as recited in Claim 21 wherein said means for sensing at least one environmental variable comprises at least one thermistor.
23. A radiant heating system as recited in Claim 22 further including:
a) a pump housing;
b) a plurality of circuit boards located within said housing; and c) said plurality of potentiometers, said microcontroller and said means for receiving are fixed an auxiliary function circuit board.
a) a pump housing;
b) a plurality of circuit boards located within said housing; and c) said plurality of potentiometers, said microcontroller and said means for receiving are fixed an auxiliary function circuit board.
24. A radiant heating system as recited in Claim 22 including a first potentiometer for selectively inputting the selection of either a fixed or an exterior-temperature dependent temperature profile for fluid within said secondary heating circuit.
25. A radiant heating system as recited in Claim 24 further including:
a) a second potentiometer for inputting a predetermined minimum temperature of fluid flow within said primary heating circuit; and b) a third potentiometer for inputting a selected exterior temperature-dependent heating profile for fluid within said secondary heating circuit.
a) a second potentiometer for inputting a predetermined minimum temperature of fluid flow within said primary heating circuit; and b) a third potentiometer for inputting a selected exterior temperature-dependent heating profile for fluid within said secondary heating circuit.
26. In a closed multistation fluid flow system of the type that includes a plurality of lines joined to common return and feed lines and in which a predetermined total flow rate is apportioned between said plurality of lines with a maximum rate associated with each of said lines, the improvement comprising, in combination:
a) a variable speed d.c. pump located within each of said plurality of lines for regulating the flow of fluid therein;
b) each of said d.c. pumps including a rotor and at least one stator winding arranged to induce rotation thereof;
c) means for regulating the flow of fluid through said pump fixed to said rotor;
d) means for sensing the speed of said rotor and the value of current flow within said at least one stator winding; and e) each of said pumps including (i) means for receiving said sensed values of speed of rotation and stator current, (ii) means for inputting the value of said maximum flow rate and (iii) means for generating a d.c. control signal in response to said sensed values and said value of maximum flow rate for application to said stator windings so that the speed of said rotor is continuously adjustable in response to flow conditions throughout said fluid flow system in such a way that the maximum flow rate of each line is not exceeded.
a) a variable speed d.c. pump located within each of said plurality of lines for regulating the flow of fluid therein;
b) each of said d.c. pumps including a rotor and at least one stator winding arranged to induce rotation thereof;
c) means for regulating the flow of fluid through said pump fixed to said rotor;
d) means for sensing the speed of said rotor and the value of current flow within said at least one stator winding; and e) each of said pumps including (i) means for receiving said sensed values of speed of rotation and stator current, (ii) means for inputting the value of said maximum flow rate and (iii) means for generating a d.c. control signal in response to said sensed values and said value of maximum flow rate for application to said stator windings so that the speed of said rotor is continuously adjustable in response to flow conditions throughout said fluid flow system in such a way that the maximum flow rate of each line is not exceeded.
27. A multistation fluid flow system as recited in Claim 26 wherein said means for inputting the value of said maximum flow rate is a potentiometer.
28. A multistation fluid flow system as recited in Claim 27 further characterized in that:
a) said means for generating a d.c.
control signal is a microcontroller; and b) said potentiometer and said micro-controller are fixed to a common circuit board.
a) said means for generating a d.c.
control signal is a microcontroller; and b) said potentiometer and said micro-controller are fixed to a common circuit board.
29. A multistation fluid flow system as recited in Claim 28 wherein said d.c. pump further comprises:
a) a housing; and b) said common circuit board is located within said pump housing.
a) a housing; and b) said common circuit board is located within said pump housing.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US887,535 | 1978-03-17 | ||
US08/887,535 US6065946A (en) | 1997-07-03 | 1997-07-03 | Integrated controller pump |
PCT/US1998/013789 WO1999001665A1 (en) | 1997-07-03 | 1998-07-01 | Integrated controller pump |
Publications (1)
Publication Number | Publication Date |
---|---|
CA2264173A1 true CA2264173A1 (en) | 1999-01-14 |
Family
ID=25391362
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA002264173A Abandoned CA2264173A1 (en) | 1997-07-03 | 1998-07-01 | Integrated controller pump |
Country Status (6)
Country | Link |
---|---|
US (1) | US6065946A (en) |
EP (1) | EP0929745A1 (en) |
AU (1) | AU8284098A (en) |
CA (1) | CA2264173A1 (en) |
HU (1) | HUP0001455A2 (en) |
WO (1) | WO1999001665A1 (en) |
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DE19822704B4 (en) * | 1998-05-20 | 2007-01-11 | Laing, Oliver | Gas-separating process water circulation pump |
US6433448B1 (en) * | 1998-11-17 | 2002-08-13 | Eaton Corporation | Integrated torque motor and throttle body |
IL147174A0 (en) * | 1999-06-21 | 2002-08-14 | Sara Lee De Nv | Dosing device adapted for dispensing a concentrate from a holder in a metered manner |
US6652249B2 (en) * | 1999-12-13 | 2003-11-25 | Parker-Hannifin Corporation | Brushless DC wet motor fuel pump with integral controller |
IT1317197B1 (en) * | 2000-04-07 | 2003-05-27 | Sicce Spa | HYDRAULIC PUMP WITH PERMANENT MAGNET MOTOR WITH DIRECTION OF ROTATION |
JP3752594B2 (en) * | 2000-04-25 | 2006-03-08 | 愛三工業株式会社 | Magnetic coupling pump |
US6659737B2 (en) * | 2001-02-05 | 2003-12-09 | Engineered Machined Products, Inc. | Electronic fluid pump with an encapsulated stator assembly |
JP2002252958A (en) * | 2001-02-23 | 2002-09-06 | Mitsubishi Electric Corp | Brushless dc motor |
GB0105641D0 (en) * | 2001-03-08 | 2001-04-25 | Lucas Industries Ltd | Improvements in electric motor driven hydraulic pumps |
GB0130185D0 (en) * | 2001-12-18 | 2002-02-06 | Imi Plc | Flow control |
US6682309B2 (en) * | 2002-01-22 | 2004-01-27 | John A. Reid | Submersible pump system |
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1997
- 1997-07-03 US US08/887,535 patent/US6065946A/en not_active Expired - Fee Related
-
1998
- 1998-07-01 WO PCT/US1998/013789 patent/WO1999001665A1/en not_active Application Discontinuation
- 1998-07-01 CA CA002264173A patent/CA2264173A1/en not_active Abandoned
- 1998-07-01 HU HU0001455A patent/HUP0001455A2/en unknown
- 1998-07-01 AU AU82840/98A patent/AU8284098A/en not_active Abandoned
- 1998-07-01 EP EP98933097A patent/EP0929745A1/en not_active Withdrawn
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WO1999001665A1 (en) | 1999-01-14 |
HUP0001455A2 (en) | 2000-09-28 |
EP0929745A1 (en) | 1999-07-21 |
AU8284098A (en) | 1999-01-25 |
US6065946A (en) | 2000-05-23 |
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