US3091182A - Centrifugal pumps - Google Patents

Centrifugal pumps Download PDF

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US3091182A
US3091182A US74545A US7454560A US3091182A US 3091182 A US3091182 A US 3091182A US 74545 A US74545 A US 74545A US 7454560 A US7454560 A US 7454560A US 3091182 A US3091182 A US 3091182A
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Prior art keywords
volute
casing
pump
insert
impeller
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Expired - Lifetime
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US74545A
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Victor F Anderson
Russell G Jobe
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Shell USA Inc
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Shell Oil Co
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/44—Fluid-guiding means, e.g. diffusers
    • F04D29/445—Fluid-guiding means, e.g. diffusers especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/428—Discharge tongues
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/62—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps
    • F04D29/628—Mounting; Assembling; Disassembling of radial or helico-centrifugal pumps especially adapted for liquid pumps
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S415/00—Rotary kinetic fluid motors or pumps
    • Y10S415/912—Interchangeable parts to vary pumping capacity or size of pump

Definitions

  • centrifugal pumps designed to meet the various pumping requirements of industry exist. These are commonly employed in the chemical, petroleum and other industries.
  • Another object is to provide a centrifugal pump so constructed that a single pump casing can be used to accommodate different impeller sizes without reducing the efiiciency of the pump.
  • a further object of the invention is to provide a means for closely matching a pump to performance requirements.
  • FIG. 1 is a side view, partly in section of a conventional centrifugal pump with cover removed and a maximum diameter impeller in place.
  • FIG. 2 is a similar view of the centrifugal pump of FIG. 1 with a reduced size impeller and an insert volute in place.
  • FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. 3.
  • FIG. 5 is a view taken along the line 5-5 of FIG. 3.
  • FIG. 6 is a detailed sectional view of part of a centrifugal pump showing an insert volute locating and locking lu".
  • FIG. 7 is a cross-section taken along the line 77 of FIG. 6.
  • FIG. 8 is a front view of part of the casing wall with a filler lug in place.
  • the pump casing consists of a main body structure 1 provided with an inlet piece 2 and an outlet piece 3.
  • an impeller 4 of such dimensions as to closely fit the casing 1 is mounted on a central shaft 5 mounted on bearings external to the pump casing 1.
  • FIG. 2 wherein elements common to FIG. 1 are given like numerals, a reduced size impeller 4a is shown which is generally similar in design to the impeller 4 shown in FIG. 1.
  • an insert element 8 Interposed between the impeller 4a and the volute area 6 of the casing is an insert element 8 with cut water 14 which is sometimes called for convenience the insert volute.
  • This insert volute can be clearly seen by reference to FIGS. 27 and is located and held in the casing by means of lugs 9 and 10.
  • the lug 9 of the insert volute 8 is so shaped that it closely fits the contour of the cut water tip 7 formed integral with the casing.
  • the lugs 9 and 10 are firmly attached to the insert volute by suitable connecting means such as screws 19 shown in FIG. 4 or are formed as a part of the insert volute.
  • the lugs 9 and 10 extend laterally from the face of the insert volute toward the casing cover. A portion of such cover is shown in FIG. 6 and is indicated by numeral 11.
  • the casing is provided with slots or grooves such as 12 for receiving the lugs 9 and 10. When in place in the slots the lugs hold the insert volute 8 locked in position.
  • the casing cover 11 is securely fastened and is fitted liquid-tight to the casing 1 by suitable connecting means such as by studs 13.
  • a conventional single stage centrifugal pump has essentially the parts shown in FIG. 1, with, of course, the addition of a cover plate to the casing 1.
  • the pumps may be individually mounted but quite often the pumps are arranged to be closely coupled to electric motors of suitable horsepower.
  • the casing 1 of the pump shown has a cast volute 6 which terminates at its closest axial point in a out water.
  • This cut water is located between the exit of the volute and the outside running edge of the impeller at a point where the volute has its smallest radius and maintains an adequate clearance for the impeller.
  • the impeller on receiving a liquid at its suction side moves it under a rotational motion (anticlockwise), as shown in FIGS. 1 and 2, discharges the liquid by centrifugal force into a progressively expanding spiral casing, wherein the velocity of the liquid gradually decreases.
  • the out water limits the amount of liquid carried back into the small section of the volute.
  • a correctly designed cut water makes a definite dam seal whereby nearly all the velocity energy is converted into pressure energy.
  • the cut water edge is not of efficient design owing to the fact that the casing is cast and it is not practical to provide the sharp edge cut water desirable.
  • variable volute insert is designed primarily to increase the pump efiiciency in situations where a maximum diameter impeller is reduced in a standard sized casing, for example, in situations where a head-capacity relationship is called for which is less than that which can be given by a maximum sized impeller.
  • the variable insert volute is so arranged that a knife edge is presented to the running edge of the impeller with a minimum permissible clearance for the particular impeller diameter.
  • variable volute insert is further designed to fit the contour of the existing volute 6 forming part of the casing 1 and to be complementary thereto, As a result, the total volute of the pump with the reduced diameter impeller is continuous, and in the form of a gradually expanding spiral proportional to the reduced liquid velocity.
  • the insert volute may be cast of suitable metal and machined, or cast of a suitable smooth plastic material which 3 is resistant to corrosion by the liquid which is being handled by the pump.
  • the insert volute is cast or molded of an epoxy resin suitably reinforced with glass fibers.
  • the cut water indicated at 14 and shown in FIG. 5 is hardened and is fabricated of a corrosion resistant metal formed into a knife edge. 7
  • the outside surface of the insert volute is formed to accurately fit the contour of the pump casing at least for a substantial distance from the original cut water of the casing in a direction anticlockwise towards the pump outlet 3.
  • the inside surface of the insert volute is designed so that it closely follows the periphery of the reduced diameter impeller for a substantial distance from the cut water in an anticlockwise direction.
  • the inside surface Wall of the volute spirals outwardly so that a gap between the periphery of the impeller is formed which increases as the distance from the cut water increases.
  • the insert volute may be of modified U section over part of its length, and as indicated at 15 on FIG. 4. This U section further increases the efficiency of the pump.
  • filler lugs 20 such as shown in FIG. 8 are inserted into the slots in the casing.
  • the filler lugs may be held in place by screws or pins 16.
  • a centrifugal pump comprising: a casing having an inlet opening and a discharge opening, a portion of the casing adjacent said discharge opening forming a fixed cut water, a first volute integral with said casing extending from said out water around the inner periphery of the casing and discharging into the discharge opening, a molded resin second volute removably mounted in said casing to form a liner to said first volute, said second volute being crescent-shaped and contoured to fit closely to said first volute and to provide an inner surface in a References Cited in the file of this patent UNITED STATES PATENTS 616,576 Jennings Dec.

Description

M y 1963 v. F. ANDERSON ET AL 3,
CENTRIFUGAL PUMPS Filed Dec. 8, 1960 2 Sheets$heet 1 A INVENTORS:
w VICTOR F. ANDERSON RUSSELL G. JOBE FIG. 5 \M BY: D @uuf THE IR ATTOR NEY y 1963 v. F. ANDERSON ET AL 3,091,182
CENTRIFUGAL PUMPS 2 Sheets-Sheet 2 Filed Dec. 8, 1960 Fl G.
FIG. 7
INVENTORS:
VICTOR F. ANDERSON RUSSELL G. JOBE ALAN THEIR ATTORNEY United States 3,091,182 CENTRIFUGAL PUMPS Victor F. Anderson and Russell G. Jobe, Pasadena, Tex., assignors to Shell Oil Company, New York, N.Y., a corporation of Delaware Filed Dec. 8, 1960, Ser. No. 74,545 1 Claim. (Cl. 103-403) This invention is particularly concerned with broadening the range of applicability of centrifugal pumps to meet specific pump performance requirements and to in crease the efficiency of these pumps.
A large number of centrifugal pumps designed to meet the various pumping requirements of industry exist. These are commonly employed in the chemical, petroleum and other industries.
In view of this wide use there is a great need for standardization of centrifugal pumps. Some progress has been made along this line through industry-wide standardization programs. However, there is the continual problem of establishing a specific pump size which will handle the largest range of head and capacity. Generally a pump size is set as the standard for a particular range over which the operating efiiciencies do not become so low that increased operating costs completely offset the capital savings realized by using the standardized pump. This problem is discussed in the paper presented at the A.S.M.E. Annual Meeting, Atlantic City, New Jersey, November 29-December 4, 1959, and published in Mechanical Engineering," February 1960 issue, pages 57-59.
It is therefore an object of this invention to provide a centrifugal pump that can readily be altered to meet efliciently a broad range of specific pump performance characteristics.
Another object is to provide a means whereby a given number of different pumps and parts can be used to serve an extended range of pumping requirements.
Another object is to provide a centrifugal pump so constructed that a single pump casing can be used to accommodate different impeller sizes without reducing the efiiciency of the pump.
A further object of the invention is to provide a means for closely matching a pump to performance requirements.
Other objects and advantages of the invention will be apparent from the following description taken in connection with the accompanying drawing which forms a part hereof.
FIG. 1 is a side view, partly in section of a conventional centrifugal pump with cover removed and a maximum diameter impeller in place.
FIG. 2 is a similar view of the centrifugal pump of FIG. 1 with a reduced size impeller and an insert volute in place.
FIG. 3 is a side view of the insert volute.
FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. 3.
FIG. 5 is a view taken along the line 5-5 of FIG. 3.
FIG. 6 is a detailed sectional view of part of a centrifugal pump showing an insert volute locating and locking lu".
FIG. 7 is a cross-section taken along the line 77 of FIG. 6.
FIG. 8 is a front view of part of the casing wall with a filler lug in place.
Referring to FIG. 1 of the drawing, the pump casing consists of a main body structure 1 provided with an inlet piece 2 and an outlet piece 3. In the pump shown in FIG. 1, an impeller 4 of such dimensions as to closely fit the casing 1 is mounted on a central shaft 5 mounted on bearings external to the pump casing 1.
The inside surface of the casing is so shaped as to 3,091,182 Patented May 28, 1963 form a spiral or volute 6, concentric and in close proximity to the periphery of the impeller 4. The inner end of the volute terminates in a out water tip 7.
In FIG. 2, wherein elements common to FIG. 1 are given like numerals, a reduced size impeller 4a is shown which is generally similar in design to the impeller 4 shown in FIG. 1. Interposed between the impeller 4a and the volute area 6 of the casing is an insert element 8 with cut water 14 which is sometimes called for convenience the insert volute. This insert volute can be clearly seen by reference to FIGS. 27 and is located and held in the casing by means of lugs 9 and 10. The lug 9 of the insert volute 8 is so shaped that it closely fits the contour of the cut water tip 7 formed integral with the casing. The lugs 9 and 10 are firmly attached to the insert volute by suitable connecting means such as screws 19 shown in FIG. 4 or are formed as a part of the insert volute. The lugs 9 and 10 extend laterally from the face of the insert volute toward the casing cover. A portion of such cover is shown in FIG. 6 and is indicated by numeral 11.
The casing is provided with slots or grooves such as 12 for receiving the lugs 9 and 10. When in place in the slots the lugs hold the insert volute 8 locked in position.
The casing cover 11 is securely fastened and is fitted liquid-tight to the casing 1 by suitable connecting means such as by studs 13.
The operation of the invention will be understood from the following.
As is well known, a conventional single stage centrifugal pump has essentially the parts shown in FIG. 1, with, of course, the addition of a cover plate to the casing 1. The pumps may be individually mounted but quite often the pumps are arranged to be closely coupled to electric motors of suitable horsepower.
The casing 1 of the pump shown has a cast volute 6 which terminates at its closest axial point in a out water. This cut water is located between the exit of the volute and the outside running edge of the impeller at a point where the volute has its smallest radius and maintains an adequate clearance for the impeller. The impeller on receiving a liquid at its suction side moves it under a rotational motion (anticlockwise), as shown in FIGS. 1 and 2, discharges the liquid by centrifugal force into a progressively expanding spiral casing, wherein the velocity of the liquid gradually decreases. The out water limits the amount of liquid carried back into the small section of the volute. A correctly designed cut water makes a definite dam seal whereby nearly all the velocity energy is converted into pressure energy. In the large majority of centrifugal pumps the cut water edge is not of efficient design owing to the fact that the casing is cast and it is not practical to provide the sharp edge cut water desirable.
The variable volute insert is designed primarily to increase the pump efiiciency in situations where a maximum diameter impeller is reduced in a standard sized casing, for example, in situations where a head-capacity relationship is called for which is less than that which can be given by a maximum sized impeller. As will be seen from FIG. 2, the variable insert volute is so arranged that a knife edge is presented to the running edge of the impeller with a minimum permissible clearance for the particular impeller diameter. The variable volute insert is further designed to fit the contour of the existing volute 6 forming part of the casing 1 and to be complementary thereto, As a result, the total volute of the pump with the reduced diameter impeller is continuous, and in the form of a gradually expanding spiral proportional to the reduced liquid velocity.
The insert volute may be cast of suitable metal and machined, or cast of a suitable smooth plastic material which 3 is resistant to corrosion by the liquid which is being handled by the pump.
In the construction shown in FIGS. 3 and 4, the insert volute is cast or molded of an epoxy resin suitably reinforced with glass fibers. The cut water indicated at 14 and shown in FIG. 5 is hardened and is fabricated of a corrosion resistant metal formed into a knife edge. 7
As will be seen from FIGS. 4 and 6, the outside surface of the insert volute is formed to accurately fit the contour of the pump casing at least for a substantial distance from the original cut water of the casing in a direction anticlockwise towards the pump outlet 3. The inside surface of the insert volute is designed so that it closely follows the periphery of the reduced diameter impeller for a substantial distance from the cut water in an anticlockwise direction. Gradually, however, the inside surface Wall of the volute spirals outwardly so that a gap between the periphery of the impeller is formed which increases as the distance from the cut water increases. As "a result of utilizing the insert volute of our invention, a volute of reduced radius is formed in the pump casing. This insert volute is provided with a smooth inner surface which also aids in improving the efiiciency of the pump.
It will be appreciated that by using the insert volute, excessive clearance and points of surface roughness and stream turbulence will be reduced which in turn decreases hydraulic losses and decreases the horsepower necessary to drive the pump.
It should be noted that the section of the insert volute close to the cut water is so contoured on its peripheral surface as to form a streamline surface with the outlet 3 of the pump. This feature also increases the efficiency of the pump.
As will be seen from FIGS. 4 and 6, the insert volute may be of modified U section over part of its length, and as indicated at 15 on FIG. 4. This U section further increases the efficiency of the pump.
When a maximum size impeller is used in the casing, filler lugs 20 such as shown in FIG. 8 are inserted into the slots in the casing. The filler lugs may be held in place by screws or pins 16.
As will be apparent to those skilled in the art, the use of the insert volute as described in this specification enables pump standardization programs to be carried out so that besides the reduced capital expenditure required,
the operating efiiciency of the pumping units is greatly improved.
By using one casing and volutes designed for each size of impeller a large range of pumping requirements can be met with a small number of elements.
We claim as our invention:
A centrifugal pump comprising: a casing having an inlet opening and a discharge opening, a portion of the casing adjacent said discharge opening forming a fixed cut water, a first volute integral with said casing extending from said out water around the inner periphery of the casing and discharging into the discharge opening, a molded resin second volute removably mounted in said casing to form a liner to said first volute, said second volute being crescent-shaped and contoured to fit closely to said first volute and to provide an inner surface in a References Cited in the file of this patent UNITED STATES PATENTS 616,576 Jennings Dec. 27, 1898 678,223 Christian July 9, 1901 765,969 Hanson July 26, 1904 1,668,183 Albrecht May 1, 1928 1,778,015 Becker Oct. 14, 1930 1,952,179 Milkowski et a1. Mar. 27, 1934 2,007,954 Carlson July 16, 1935 2,260,946 Korte et a1. Oct. 28, 1941 2,280,585 Kapitza Apr. 21, 1942 2,764,096 Engstrom Sept. 25, 1956 2,831,434 Paashaus Apr. 22, 1958 2,868,441 Reutt Ian. 13, 1959 FOREIGN PATENTS 1,616 Great Britain of 1899 110,760 Australia June 20, 1940 333,443 Great Britain Aug. 14, 1930 719,311 Great Britain Dec. 1, 1954 819,174 France July 5, 1937
US74545A 1960-12-08 1960-12-08 Centrifugal pumps Expired - Lifetime US3091182A (en)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3647314A (en) * 1970-04-08 1972-03-07 Gen Electric Centrifugal pump
US3778181A (en) * 1971-03-24 1973-12-11 Gorman Rupp Co Centrifugal pump
US4052133A (en) * 1975-11-12 1977-10-04 The Gorman-Rupp Company Corrosion and abrasion resistant centrifugal pump
US4076450A (en) * 1976-01-14 1978-02-28 United Centrifugal Pumps Double volute pump with replaceable lips
JPS54145006A (en) * 1978-04-26 1979-11-12 Sundstrand Corp Centrifugal pump
US4688293A (en) * 1985-04-08 1987-08-25 Central Quality Industries, Inc. Vacuum cleaner
US4783878A (en) * 1985-04-08 1988-11-15 Central Quality Industries, Inc. Vacuum cleaner
US5076758A (en) * 1990-07-18 1991-12-31 Ingersoll-Rand Company Centrifugal pumps
EP0618369A1 (en) * 1993-03-31 1994-10-05 KSB Aktiengesellschaft Barrel-type pump
US6244855B1 (en) 1999-08-11 2001-06-12 R. W. Beckett Corporation Burner with air flow adjustment
US20060013707A1 (en) * 2004-07-13 2006-01-19 Pump Engineering, Inc. Centrifugal pump
US9587641B2 (en) 2012-04-11 2017-03-07 Waterous Company Integrated reciprocating primer drive arrangement
US20180017073A1 (en) * 2015-01-27 2018-01-18 Mitsubishi Heavy Industries Compressor Corporation Centrifugal compressor casing and centrifugal compressor
US20180320703A1 (en) * 2017-04-28 2018-11-08 Fluid Handling Llc. Technique to improve the performance of a pump with a trimmed impeller using additive manufacturing
US20190017429A1 (en) * 2017-07-12 2019-01-17 Ford Global Technologies, Llc Coolant pump for an internal combustion engine
DE102021122798A1 (en) 2021-05-28 2022-12-01 Huizhou Hanxu Hardware Plastic Technology Co., Ltd. LIQUID-COOLING PUMP AND ITS CONSTRUCTION OF THE FLOW CHANNEL

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US616576A (en) * 1898-12-27 William jennings
GB189901616A (en) * 1899-01-24 1899-05-13 Henry Bernoulli Barlow An Improved Centrifugal Pump.
US678223A (en) * 1900-09-06 1901-07-09 Robert W Christian Centrifugal pump.
US765969A (en) * 1903-10-27 1904-07-26 Nils Knut Fredrik Hanson Centrifugal pump.
US1668183A (en) * 1924-08-18 1928-05-01 Albert W Albrecht Centrifugal pump
GB333443A (en) * 1929-10-02 1930-08-14 Ash Company London Ltd Improvements in centrifugal pumps
US1778015A (en) * 1929-01-24 1930-10-14 Hoover Co Fan casing
US1952179A (en) * 1931-09-21 1934-03-27 Victor J Milkowski Pump lining
US2007954A (en) * 1932-04-21 1935-07-16 Gunard O Carlson Acid handling equipment and method of producing the same
FR819174A (en) * 1936-06-16 1937-10-12 Cem Comp Electro Mec Device for improving the flow rate of centrifugal machines used to move or compress fluids
US2260946A (en) * 1940-04-20 1941-10-28 Carter Carburetor Corp Electric fuel pump
US2280585A (en) * 1938-09-16 1942-04-21 Kapitza Peter Expansion turbine for low temperature plants
GB719311A (en) * 1950-10-19 1954-12-01 Hoechst Ag Centrifugal pump
US2764096A (en) * 1952-12-15 1956-09-25 Continental Motors Corp Water pump for internal combustion engine
US2831434A (en) * 1956-04-05 1958-04-22 Worthington Corp Self-priming centrifugal pump
US2868441A (en) * 1954-02-24 1959-01-13 Armstrong Siddeley Motors Ltd Plastic blades, particularly for a compressor rotor of a gas turbine engine

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US616576A (en) * 1898-12-27 William jennings
GB189901616A (en) * 1899-01-24 1899-05-13 Henry Bernoulli Barlow An Improved Centrifugal Pump.
US678223A (en) * 1900-09-06 1901-07-09 Robert W Christian Centrifugal pump.
US765969A (en) * 1903-10-27 1904-07-26 Nils Knut Fredrik Hanson Centrifugal pump.
US1668183A (en) * 1924-08-18 1928-05-01 Albert W Albrecht Centrifugal pump
US1778015A (en) * 1929-01-24 1930-10-14 Hoover Co Fan casing
GB333443A (en) * 1929-10-02 1930-08-14 Ash Company London Ltd Improvements in centrifugal pumps
US1952179A (en) * 1931-09-21 1934-03-27 Victor J Milkowski Pump lining
US2007954A (en) * 1932-04-21 1935-07-16 Gunard O Carlson Acid handling equipment and method of producing the same
FR819174A (en) * 1936-06-16 1937-10-12 Cem Comp Electro Mec Device for improving the flow rate of centrifugal machines used to move or compress fluids
US2280585A (en) * 1938-09-16 1942-04-21 Kapitza Peter Expansion turbine for low temperature plants
US2260946A (en) * 1940-04-20 1941-10-28 Carter Carburetor Corp Electric fuel pump
GB719311A (en) * 1950-10-19 1954-12-01 Hoechst Ag Centrifugal pump
US2764096A (en) * 1952-12-15 1956-09-25 Continental Motors Corp Water pump for internal combustion engine
US2868441A (en) * 1954-02-24 1959-01-13 Armstrong Siddeley Motors Ltd Plastic blades, particularly for a compressor rotor of a gas turbine engine
US2831434A (en) * 1956-04-05 1958-04-22 Worthington Corp Self-priming centrifugal pump

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3647314A (en) * 1970-04-08 1972-03-07 Gen Electric Centrifugal pump
US3778181A (en) * 1971-03-24 1973-12-11 Gorman Rupp Co Centrifugal pump
US4052133A (en) * 1975-11-12 1977-10-04 The Gorman-Rupp Company Corrosion and abrasion resistant centrifugal pump
US4076450A (en) * 1976-01-14 1978-02-28 United Centrifugal Pumps Double volute pump with replaceable lips
JPS54145006A (en) * 1978-04-26 1979-11-12 Sundstrand Corp Centrifugal pump
US4688293A (en) * 1985-04-08 1987-08-25 Central Quality Industries, Inc. Vacuum cleaner
US4783878A (en) * 1985-04-08 1988-11-15 Central Quality Industries, Inc. Vacuum cleaner
US5076758A (en) * 1990-07-18 1991-12-31 Ingersoll-Rand Company Centrifugal pumps
EP0618369A1 (en) * 1993-03-31 1994-10-05 KSB Aktiengesellschaft Barrel-type pump
US6382959B2 (en) 1999-08-11 2002-05-07 R. W. Beckett Corporation Burner with air flow adjustment
US6244855B1 (en) 1999-08-11 2001-06-12 R. W. Beckett Corporation Burner with air flow adjustment
US20060013707A1 (en) * 2004-07-13 2006-01-19 Pump Engineering, Inc. Centrifugal pump
US8579603B2 (en) * 2004-07-13 2013-11-12 Energy Recovery, Inc. Centrifugal pump
US9587641B2 (en) 2012-04-11 2017-03-07 Waterous Company Integrated reciprocating primer drive arrangement
US20180017073A1 (en) * 2015-01-27 2018-01-18 Mitsubishi Heavy Industries Compressor Corporation Centrifugal compressor casing and centrifugal compressor
US10539151B2 (en) * 2015-01-27 2020-01-21 Mitsubishi Heavy Industries Compressor Corporation Centrifugal compressor casing and centrifugal compressor
US20180320703A1 (en) * 2017-04-28 2018-11-08 Fluid Handling Llc. Technique to improve the performance of a pump with a trimmed impeller using additive manufacturing
US11511372B2 (en) * 2017-04-28 2022-11-29 Fluid Handling Llc Technique to improve the performance of a pump with a trimmed impeller using additive manufacturing
US20190017429A1 (en) * 2017-07-12 2019-01-17 Ford Global Technologies, Llc Coolant pump for an internal combustion engine
US10920652B2 (en) * 2017-07-12 2021-02-16 Ford Global Technologies, Llc Coolant pump for an internal combustion engine
DE102021122798A1 (en) 2021-05-28 2022-12-01 Huizhou Hanxu Hardware Plastic Technology Co., Ltd. LIQUID-COOLING PUMP AND ITS CONSTRUCTION OF THE FLOW CHANNEL
DE102021122798B4 (en) 2021-05-28 2022-12-22 Huizhou Hanxu Hardware Plastic Technology Co., Ltd. LIQUID-COOLING PUMP AND ITS CONSTRUCTION OF THE FLOW CHANNEL

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