US3738230A - Variable stroke multiple pump - Google Patents

Variable stroke multiple pump Download PDF

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US3738230A
US3738230A US00120282A US3738230DA US3738230A US 3738230 A US3738230 A US 3738230A US 00120282 A US00120282 A US 00120282A US 3738230D A US3738230D A US 3738230DA US 3738230 A US3738230 A US 3738230A
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eccentric
piston
pump
disk
bushing
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G Censi
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    • 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
    • F04B49/12—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 by varying the length of stroke of the working members
    • F04B49/123—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 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element
    • F04B49/125—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 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element by changing the eccentricity of the actuation means, e.g. cams or cranks, relative to the driving means, e.g. driving shafts
    • F04B49/126—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 by varying the length of stroke of the working members by changing the eccentricity of one element relative to another element by changing the eccentricity of the actuation means, e.g. cams or cranks, relative to the driving means, e.g. driving shafts with a double eccenter mechanism
    • 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
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/06—Control
    • F04B1/07—Control by varying the relative eccentricity between two members, e.g. a cam and a drive shaft

Definitions

  • the invention provides therefore a pluricylinder pump comprising a number of variable stroke pumping units, each pumping a separate fluid, the pistons of these units being reciprocated by a common shaft.
  • the mutual pumping proportions can be selected by means permitting to vary, on said common shaft, the crank radius relatively to each piston. Thereby, said proportions, once set, are not affected by the speed of the pump shaft.
  • the means for varying the crank radius comprise, for each individual piston, an eccentric rigid with said shaft, said eccentric being rotatable within a matching circular opening, which is provided in a disk and offcentered with respect to the latter. On said disk is mounted the annularly shaped eye of the large or crankpin end of the connecting rod. The stroke of each piston is varied by rotating the disk around the eccentric till the required crank radius is obtained, and fixing it in position. Further means are provided to readily vary the relative position of each pair of eccentrics from the exterior. Since all pistons are driven from a common shaft, the proportions at which each liquid is pumped will of course remain constant, independently of the speed of the pump shaft.
  • the pistons present two sets of packings, one at their top portion, the other at the bottom portion, and thereby they divide their associated cylinder into an upper and a lower chamber, the upper communicating with the liquid, the other communicating with the external air through at least one aperture in the cylinder walls. Thereby the liquid in the upper chamber is prevented from coming into contactwith the lubricating oil of the pump, as it will be explained later in greater detail.
  • FIG. 1 is a lateral partial sectional view of a pump embodying the invention
  • FIG. 2 is a sectional view taken along the line 2-2 of FIG. 1, and
  • FIG. 3 is an enlarged sectional view of a detail of FIG.
  • the pump housing also contains the step-up gearing transmitting the drive from a motor to the pump shaft.
  • the drive shaft 16 is rotatably supported in the housing 10 in two bearings 12 and 14 and its end projecting beyond the housing carries a pulley l8 fastened to it by a bolt and a washer 22.
  • a spur gear 24 keyed to shaft 16 meshes with a spur gear 26 ofa much smaller diameter keyed to the pump shaft 28, to form the step-up mechanism transmitting the drive from the motor to the pump.
  • Two circular eccentrics 34 and 36 are keyed to the pump shaft 28. Each eccentric is positioned within a matching circular opening of a disk 38, 40 respectively,
  • a pin 42 and 44 respectively projects laterally from each disk 38, 40, on which are oscillatabiy mounted the annular crankpin ends 55, 57 of connecting rods 54, 56 respectively.
  • each bushing Adjacently to the eccentrics, each bushing forms a circular flange 47, 49 respectively.
  • Each flange is provided with a radial slot 50 and 52 respectively, into which engages the pin 42 and 44 respectively projecting from the adjacent lateral surfaces of each disk 38, 40.
  • Each disk 38, 40 and eye 55, 57 is retained upon its respective eccentric 34, 36 by flange 35, 37 provided on each eccentric 34, 36.
  • a knurled wheel 51 and 53 respectively is keyed to each bushing externally of housing 10.
  • a graduated plate 94 and 96 is keyed to each terminal portion of shaft 28.
  • the disk associated with the bushing by the pin 42, 44 is rotated relatively to the corresponding eccentric, and thereby the crank radius R and thus the stroke of the corresponding piston is varied steplessly.
  • the wheel can be provided with an index mark, and the graduation on the plates 94, 96 may correspond either directly to the stroke of the piston or to the piston displacement.
  • each piston can be set independently of that of the other piston and therefore the proportions of the fluids delivered through each cylinder can be steplessly varied at will by positioning the wheels 51, 53 relatively to the graduated plates 94, 96 and fastening them by tightening the bolts 90, 92 respectively.
  • the pistons 58 and 60 associated with the connecting rods 54 and 56 respectively have two disks 62, 66 and 64, 68 respectively, and operate in two cylinders 70 and 72, respectively.
  • the cylinder 70 is divided by the disks of piston 58 in an upper chamber 74 extending between the cylinder head and the disk 62, and a lower chamber 76 extending between said disk 62 and the disk 66.
  • one of the fluids is pumped from the suction side 78 into the chamber 74 and thence into the discharge side 80, which is provided in the usual manner with an air chamber 82.
  • the chamber 76 communicates with the exterior through slits 97.
  • This chamber serves to prevent any contact between the fluids to be pumped and the lubricating oil of the pump even in case where the piston packings become defective. In fact, either the oil which might leak through the packing of the lower piston disk or the fluid which might leak through the packing of the upper disk are discharged through said slits.
  • the piston 60 divides its relating cylinder 72 into an upper chamber 84 and a lower chamber 86.
  • the pumping circuit is identical to that of the cylinder 70 and is therefore neither described nor illustrated.
  • the discharge pipe of cylinder chamber 84 may be provided with an air chamber 88.
  • the bores of the cylinders might be of identical or different size.
  • A- two-cylinder pump for pumping two fluids at respective variable rates comprising:
  • each of the disks having an opening formed therein for mounting said disk on a respective one of the eccentrics in a selectively variable position
  • each piston member having an associated piston rod formed with an eye at the end thereof rotatably mounted on a respective one of the disks;
  • each bushing having a flange formed thereon which extends over and abuts the other side surface of the associated piston rod eye and corresponding disk for retaining each disk and piston rod eye mounted on its associated eccentric and disk respectively, and means for selectively independently varying the relative position of each disk with respect to its associated eccentric including engaging means provided on each said bushing and eccentric engaging each eccentric to an associated bushing for rotating said eccentric in response to rotation of said associated bushing 2.
  • said means engaging each eccentric to an associated bushing includes a slot provided in either said eccentric or bushing and a pin member provided in the other of said eccentric or bushing extending into said slot for sliding movement therein.
  • each piston member comprises an upper and lower piston, which upper piston defines an upper cylinder chamber extending from the upper piston to the cylinder head and which lower piston defines a lower cylinder chamber extending between the two pistons.
  • each upper cylinder chamber has a fluid inlet and a fluid discharge for passage of each pumped fluid and wherein the lower cylinder chamber has at least one opening formed therein providing fluid communication between the interior of the lower cylinder chamber and the exterior of the pump so that any of the pumped fluid which leaks down past the upper piston or any lubricating oil which is normally disposed in the pump casing which leaks past the lower piston will be discharged through the opening to the pump exterior.

Abstract

The pump comprises two cylinders with pistons actuated from a common shaft fitted with eccentrics corresponding to each piston, between each eccentric and the large end of each connecting rod being interposed a disc with an opening which receives said eccentric, said opening being offcentered with respect to said disc so that by rotating said disc with respect to said eccentric the crank radius of the connecting rod and consequently the stroke of the corresponding piston can be varied at will.

Description

9. 1 P. United States atent 1191 1111 3,738,230 Censi 1 June 12, 1973 [54] VARIABLE STROKE MULTIPLE PUMP 1,640,509 8/1927 Lowe 92/133 X 2,929,334 3/1960 Panhard 92/13 X [761 Invent Gmrg Censi, (561100198 2,935,112 5/1960 Vangerpen 92/13 x Rome, Italy 3,171,287 3/1965 Jesse 92/13.? x 3,180,178 4/1965 Brown et a1. 92/13.? X [22] 1971 3,257,953 6/1966 Pinkerton 92/137 x [21] Appl. No.: 120,282
Primary Examiner-lrwin C. Cohen Foreign Application Priority Data Attorney-Darby & Darby June 26, 1970 Italy 51726 A/70 [57] ABSTRACT [52] US. Cl. 92/13.3, 92/137,;2/325 The pump comprises two cylinders with pistons actw 51 1111. C1. F01b 31/14, F04b 23 06 med a shaft fitted eccemrcs spending to each piston, between each eccentric and [58] Field of Search ..92/l3, 13.3, 3,13.7,
92/86 417/429 539 533 the large end of each connecting rod being interposed a disc with an opening which receives said eccentric, said opening being offcentered with respect to said disc [56] References Cited so that by rotating said disc with respect to said eccen- UNITED STATES PATENTS tric the crank radius of the connecting rod and conse- 1,328,474 1/1920 Astrom 92/86 X quently the stroke of the corresponding piston can be 2,136,599 11/1938 Thompson et a1. 92/86 x varied at m 2,612,839 10/1952 Denny 92/133 2,957,422 10/1960 Loeber 92/13.7 4 Claims, 3 Drawing Figures 54 55 32 5/ 45 155 46 92' 2s .96 CD56 52 .54 .9 4o .55 50 VARIABLE STROKE MULTIPLE PUMP The present invention refers to variable stroke multiple pumps.
In many applications it becomes necessary to pump a number of liquids in a preselected constant mutual proportion. In many other applications it is also imperative to pump these liquids simultaneously but in separate flows, especially in the case of reactive liquids, in order to prevent them from mixing and reacting upstream of or within the pump.
The invention provides therefore a pluricylinder pump comprising a number of variable stroke pumping units, each pumping a separate fluid, the pistons of these units being reciprocated by a common shaft. The mutual pumping proportions can be selected by means permitting to vary, on said common shaft, the crank radius relatively to each piston. Thereby, said proportions, once set, are not affected by the speed of the pump shaft.
The means for varying the crank radius comprise, for each individual piston, an eccentric rigid with said shaft, said eccentric being rotatable within a matching circular opening, which is provided in a disk and offcentered with respect to the latter. On said disk is mounted the annularly shaped eye of the large or crankpin end of the connecting rod. The stroke of each piston is varied by rotating the disk around the eccentric till the required crank radius is obtained, and fixing it in position. Further means are provided to readily vary the relative position of each pair of eccentrics from the exterior. Since all pistons are driven from a common shaft, the proportions at which each liquid is pumped will of course remain constant, independently of the speed of the pump shaft.
The pistons present two sets of packings, one at their top portion, the other at the bottom portion, and thereby they divide their associated cylinder into an upper and a lower chamber, the upper communicating with the liquid, the other communicating with the external air through at least one aperture in the cylinder walls. Thereby the liquid in the upper chamber is prevented from coming into contactwith the lubricating oil of the pump, as it will be explained later in greater detail.
A possible embodiment of the pump will now be described with reference -to the attached drawings, wherein:
FIG. 1 is a lateral partial sectional view of a pump embodying the invention,
FIG. 2 is a sectional view taken along the line 2-2 of FIG. 1, and
FIG. 3 is an enlarged sectional view of a detail of FIG.
With reference to the drawings, the pump housing also contains the step-up gearing transmitting the drive from a motor to the pump shaft. The drive shaft 16 is rotatably supported in the housing 10 in two bearings 12 and 14 and its end projecting beyond the housing carries a pulley l8 fastened to it by a bolt and a washer 22. A spur gear 24 keyed to shaft 16 meshes with a spur gear 26 ofa much smaller diameter keyed to the pump shaft 28, to form the step-up mechanism transmitting the drive from the motor to the pump.
Two circular eccentrics 34 and 36 are keyed to the pump shaft 28. Each eccentric is positioned within a matching circular opening of a disk 38, 40 respectively,
the openings being offcentered with respect to said disks. A pin 42 and 44 respectively projects laterally from each disk 38, 40, on which are oscillatabiy mounted the annular crankpin ends 55, 57 of connecting rods 54, 56 respectively.
The portions of the pump shaft 28 which extend on both sides from the eccentrics 34, 36 to the shaft ends are supported on bushings 46 and 48 respectively, which are in turn rotatable in the housing 10 on bearings 30 and 32 respectively. Adjacently to the eccentrics, each bushing forms a circular flange 47, 49 respectively. Each flange is provided with a radial slot 50 and 52 respectively, into which engages the pin 42 and 44 respectively projecting from the adjacent lateral surfaces of each disk 38, 40. Each disk 38, 40 and eye 55, 57 is retained upon its respective eccentric 34, 36 by flange 35, 37 provided on each eccentric 34, 36. A knurled wheel 51 and 53 respectively is keyed to each bushing externally of housing 10. A graduated plate 94 and 96 is keyed to each terminal portion of shaft 28. By rotating one of the graduated plates 94, 96 respectively relatively to its corresponding wheel 51, 53, also the disk associated with the bushing by the pin 42, 44 is rotated relatively to the corresponding eccentric, and thereby the crank radius R and thus the stroke of the corresponding piston is varied steplessly. The wheel can be provided with an index mark, and the graduation on the plates 94, 96 may correspond either directly to the stroke of the piston or to the piston displacement.
The stroke of each piston can be set independently of that of the other piston and therefore the proportions of the fluids delivered through each cylinder can be steplessly varied at will by positioning the wheels 51, 53 relatively to the graduated plates 94, 96 and fastening them by tightening the bolts 90, 92 respectively.
The pistons 58 and 60 associated with the connecting rods 54 and 56 respectively have two disks 62, 66 and 64, 68 respectively, and operate in two cylinders 70 and 72, respectively. The cylinder 70 is divided by the disks of piston 58 in an upper chamber 74 extending between the cylinder head and the disk 62, and a lower chamber 76 extending between said disk 62 and the disk 66. As shown in FIG. 2, one of the fluids is pumped from the suction side 78 into the chamber 74 and thence into the discharge side 80, which is provided in the usual manner with an air chamber 82. The chamber 76 communicates with the exterior through slits 97. This chamber serves to prevent any contact between the fluids to be pumped and the lubricating oil of the pump even in case where the piston packings become defective. In fact, either the oil which might leak through the packing of the lower piston disk or the fluid which might leak through the packing of the upper disk are discharged through said slits. Also the piston 60 divides its relating cylinder 72 into an upper chamber 84 and a lower chamber 86. The pumping circuit is identical to that of the cylinder 70 and is therefore neither described nor illustrated. Similarly also the discharge pipe of cylinder chamber 84 may be provided with an air chamber 88. The bores of the cylinders might be of identical or different size.
I claim:
1. A- two-cylinder pump for pumping two fluids at respective variable rates comprising:
a rotatable pump shaft;
a pair of eccentrics mounted in spaced relationship on the pump shaft;
a pair of disks, each of the disks having an opening formed therein for mounting said disk on a respective one of the eccentrics in a selectively variable position;
a pair of piston members, each piston member having an associated piston rod formed with an eye at the end thereof rotatably mounted on a respective one of the disks;
a flange formed on each of said eccentrics extending over and abutting a side surface of the associated piston rod eye and corresponding disk for retaining each disk and piston rod eye mounted on its associated eccentric and disk respectively; and
a pair of bushings fitted over respective ends of the pump shaft, each bushing having a flange formed thereon which extends over and abuts the other side surface of the associated piston rod eye and corresponding disk for retaining each disk and piston rod eye mounted on its associated eccentric and disk respectively, and means for selectively independently varying the relative position of each disk with respect to its associated eccentric including engaging means provided on each said bushing and eccentric engaging each eccentric to an associated bushing for rotating said eccentric in response to rotation of said associated bushing 2. A two-cylinder pump as defined in claim 1 wherein said means engaging each eccentric to an associated bushing includes a slot provided in either said eccentric or bushing and a pin member provided in the other of said eccentric or bushing extending into said slot for sliding movement therein.
3. A two cylinder pump as recited in claim 1, wherein each piston member comprises an upper and lower piston, which upper piston defines an upper cylinder chamber extending from the upper piston to the cylinder head and which lower piston defines a lower cylinder chamber extending between the two pistons.
4. A two cylinder pump as recited in claim 3, wherein each upper cylinder chamber has a fluid inlet and a fluid discharge for passage of each pumped fluid and wherein the lower cylinder chamber has at least one opening formed therein providing fluid communication between the interior of the lower cylinder chamber and the exterior of the pump so that any of the pumped fluid which leaks down past the upper piston or any lubricating oil which is normally disposed in the pump casing which leaks past the lower piston will be discharged through the opening to the pump exterior.

Claims (4)

1. A two-cylinder pump for pumping two fluids at respective variable rates comprising: a rotatable pump shaft; a pair of eccentrics mounted in spaced relationship on the pump shaft; a pair of disks, each of the disks having an opening formed therein for mounting said disk on a reSpective one of the eccentrics in a selectively variable position; a pair of piston members, each piston member having an associated piston rod formed with an eye at the end thereof rotatably mounted on a respective one of the disks; a flange formed on each of said eccentrics extending over and abutting a side surface of the associated piston rod eye and corresponding disk for retaining each disk and piston rod eye mounted on its associated eccentric and disk respectively; and a pair of bushings fitted over respective ends of the pump shaft, each bushing having a flange formed thereon which extends over and abuts the other side surface of the associated piston rod eye and corresponding disk for retaining each disk and piston rod eye mounted on its associated eccentric and disk respectively, and means for selectively independently varying the relative position of each disk with respect to its associated eccentric including engaging means provided on each said bushing and eccentric engaging each eccentric to an associated bushing for rotating said eccentric in response to rotation of said associated bushing.
2. A two-cylinder pump as defined in claim 1 wherein said means engaging each eccentric to an associated bushing includes a slot provided in either said eccentric or bushing and a pin member provided in the other of said eccentric or bushing extending into said slot for sliding movement therein.
3. A two cylinder pump as recited in claim 1, wherein each piston member comprises an upper and lower piston, which upper piston defines an upper cylinder chamber extending from the upper piston to the cylinder head and which lower piston defines a lower cylinder chamber extending between the two pistons.
4. A two cylinder pump as recited in claim 3, wherein each upper cylinder chamber has a fluid inlet and a fluid discharge for passage of each pumped fluid and wherein the lower cylinder chamber has at least one opening formed therein providing fluid communication between the interior of the lower cylinder chamber and the exterior of the pump so that any of the pumped fluid which leaks down past the upper piston or any lubricating oil which is normally disposed in the pump casing which leaks past the lower piston will be discharged through the opening to the pump exterior.
US00120282A 1970-06-26 1971-03-02 Variable stroke multiple pump Expired - Lifetime US3738230A (en)

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Cited By (14)

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Publication number Priority date Publication date Assignee Title
US3851798A (en) * 1972-11-10 1974-12-03 Miller Mfg Co Of Schiller Park Automatic colorant dispenser
US3906842A (en) * 1972-01-31 1975-09-23 Iwaki Co Ltd Variable metering pump
US4031778A (en) * 1974-08-28 1977-06-28 The International Nickel Company, Inc. Drive system
US4041844A (en) * 1974-06-12 1977-08-16 Sulzer Brothers Limited Hydrostatic piston machine
US4700549A (en) * 1986-06-11 1987-10-20 Sundstrand Corporation On-board refrigerant charging system
US4776260A (en) * 1980-11-07 1988-10-11 Vincze Alexander L Constant pressure pump
US5951261A (en) * 1998-06-17 1999-09-14 Tecumseh Products Company Reversible drive compressor
FR2786228A1 (en) * 1998-11-23 2000-05-26 Milton Roy Dosapro Drive unit for a dispensing pump with continuous adjustment to the crank arm whilst in operation.
US6190137B1 (en) 1999-09-24 2001-02-20 Tecumseh Products Company Reversible, variable displacement compressor
US6619926B2 (en) 2001-09-12 2003-09-16 Tecumseh Products Company Cam and crank engagement for a reversible, variable displacement compressor and a method of operation therefor
US20060088423A1 (en) * 2004-10-27 2006-04-27 Halliburton Energy Services, Inc. Variable rate pumping system
US20060088425A1 (en) * 2004-10-27 2006-04-27 Halliburton Energy Services, Inc. Variable stroke assembly
US20130047836A1 (en) * 2011-08-19 2013-02-28 Harken, Incorporated (a Wisconsin Corporation) Multi-speed hydraulic pump
CN104728070A (en) * 2015-02-17 2015-06-24 上海金箭水射流设备制造有限公司 Power drive system of high pressure water jet pump

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JPS5726054Y2 (en) * 1972-01-31 1982-06-07
US4141676A (en) * 1977-06-02 1979-02-27 John Blue Company Division Of Subscription Television, Inc. Pump for soil fumigant
DE102010043886A1 (en) * 2010-11-15 2012-05-16 Continental Teves Ag & Co. Ohg Piston pump for conveying pressure fluid in hydraulic brake system, has one pump piston independently rendered stationary by actuation of other pump pistons for reducing pressure fluid delivery, and for switching one of eccentric cams
DE102014005143A1 (en) * 2014-04-07 2015-10-08 Tankol Gmbh Gesellschaft Für Fluidtechnik Positive displacement pump with at least two different delivery rates at input speed
DE102014215056A1 (en) * 2014-07-31 2016-02-04 Skf Lubrication Systems Germany Ag Pump element and piston pump for conveying a liquid medium

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US1328474A (en) * 1919-11-11 1920-01-20 Fort Wayne Engineering & Mfg C Pump
US1640509A (en) * 1926-11-30 1927-08-30 J W Clune Co Fuel-pumping mechanism for internal-combustion engines
US2136599A (en) * 1936-06-15 1938-11-15 Fmc Corp Spray pump
US2612839A (en) * 1947-09-02 1952-10-07 Webster Brinkley Co Variable-delivery pump
US2957422A (en) * 1956-01-09 1960-10-25 Dempster Mill Mfg Co Pumps
US2929334A (en) * 1956-06-11 1960-03-22 Panhard & Levassor Ets Variable-output hydraulic generator
US2936712A (en) * 1958-01-20 1960-05-17 Deere & Co Variable displacement pump
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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3906842A (en) * 1972-01-31 1975-09-23 Iwaki Co Ltd Variable metering pump
US3851798A (en) * 1972-11-10 1974-12-03 Miller Mfg Co Of Schiller Park Automatic colorant dispenser
US4041844A (en) * 1974-06-12 1977-08-16 Sulzer Brothers Limited Hydrostatic piston machine
US4031778A (en) * 1974-08-28 1977-06-28 The International Nickel Company, Inc. Drive system
US4776260A (en) * 1980-11-07 1988-10-11 Vincze Alexander L Constant pressure pump
US4700549A (en) * 1986-06-11 1987-10-20 Sundstrand Corporation On-board refrigerant charging system
US5951261A (en) * 1998-06-17 1999-09-14 Tecumseh Products Company Reversible drive compressor
FR2786228A1 (en) * 1998-11-23 2000-05-26 Milton Roy Dosapro Drive unit for a dispensing pump with continuous adjustment to the crank arm whilst in operation.
US6190137B1 (en) 1999-09-24 2001-02-20 Tecumseh Products Company Reversible, variable displacement compressor
US6619926B2 (en) 2001-09-12 2003-09-16 Tecumseh Products Company Cam and crank engagement for a reversible, variable displacement compressor and a method of operation therefor
US20060088423A1 (en) * 2004-10-27 2006-04-27 Halliburton Energy Services, Inc. Variable rate pumping system
US20060088425A1 (en) * 2004-10-27 2006-04-27 Halliburton Energy Services, Inc. Variable stroke assembly
US7409901B2 (en) 2004-10-27 2008-08-12 Halliburton Energy Services, Inc. Variable stroke assembly
US7563076B2 (en) 2004-10-27 2009-07-21 Halliburton Energy Services, Inc. Variable rate pumping system
US20090252616A1 (en) * 2004-10-27 2009-10-08 Halliburton Energy Services, Inc. Variable Rate Pumping System
US20130047836A1 (en) * 2011-08-19 2013-02-28 Harken, Incorporated (a Wisconsin Corporation) Multi-speed hydraulic pump
US9217424B2 (en) * 2011-08-19 2015-12-22 Harken, Inc. Multi-speed hydraulic pump
AU2012299211B2 (en) * 2011-08-19 2016-08-25 Harken, Inc Multi-speed hydraulic pump
CN104728070A (en) * 2015-02-17 2015-06-24 上海金箭水射流设备制造有限公司 Power drive system of high pressure water jet pump

Also Published As

Publication number Publication date
DE7107550U (en) 1973-11-08
FR2095491A5 (en) 1972-02-11
BE764191A (en) 1971-09-13
AT309991B (en) 1973-09-10
CH530556A (en) 1972-11-15
NL7102850A (en) 1971-12-28
DE2109589A1 (en) 1972-01-05
LU62729A1 (en) 1971-08-23
GB1322469A (en) 1973-07-04

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