US3898014A - Self-priming centrifugal pump - Google Patents

Self-priming centrifugal pump Download PDF

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Publication number
US3898014A
US3898014A US411262A US41126273A US3898014A US 3898014 A US3898014 A US 3898014A US 411262 A US411262 A US 411262A US 41126273 A US41126273 A US 41126273A US 3898014 A US3898014 A US 3898014A
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US
United States
Prior art keywords
opening
priming
fluid
volute
pump
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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.)
Expired - Lifetime
Application number
US411262A
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English (en)
Inventor
David L Meister
Edward L Ohler
Jr Frank D Makowski
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gorman Rupp Co
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Gorman Rupp Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Gorman Rupp Co filed Critical Gorman Rupp Co
Priority to US411262A priority Critical patent/US3898014A/en
Priority to AU72588/74A priority patent/AU476857B2/en
Priority to ZA00745463A priority patent/ZA745463B/xx
Priority to CA207,967A priority patent/CA997210A/en
Priority to GB4229474A priority patent/GB1464027A/en
Priority to JP12325974A priority patent/JPS5410361B2/ja
Application granted granted Critical
Publication of US3898014A publication Critical patent/US3898014A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/004—Priming of not self-priming pumps
    • F04D9/005—Priming of not self-priming pumps by adducting or recycling liquid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D9/00—Priming; Preventing vapour lock
    • F04D9/02—Self-priming pumps

Definitions

  • ABSTRACT A self-priming centrifugal pump having suction and separation chambers defined within a casing. and a ro tatable impeller positioned in a volute for transferring fluid from the suction chamber to the separation chamber Reprime lift capability and priming rate are substantially improved by an elbow-shaped priming passage communicating the lower region of the separation chamber with the lower region of the volutc, and by an upstanding ramplike shoulder formed in the volute below the impeller.
  • the improved priming passage configuration and the ramp-like shoulder are believed to effect a more efi'lcient delivery of fluid from the separation chamber to the impeller during pump priming, and to effect a more turbulent mixing in the impeller of fluid with air from the suction chamber whereby air is efficiently entrained in the exhausted fluid and the pump is rapidly reprimed,
  • the present invention relates generally to centrifugal pumps, and more particularly to an improved self priming centrifugal pump of the type designed to handle large solids encountered in domestic and industrial waste water and sewage systems.
  • Prior Art Centrifugal self-priming pumps having a capacity to handle fluids containing relatively large solids are known, as illustrated by the referenced patents. These pumps typically include a casing which defines separate suction and separation chambers. A rotatable impeller positioned in a volute is arranged to transfer fluid from the suction chamber to the separation chamber.
  • a suction check valve is normally provided adjacent the inlet to the suction chamber to retain fluid in the pump when the pump is shut down. If the check valve does not seat completely due to damage or due to de bris trapped in the valve, much of the fluid which has entered the pump is siphoned back out of the pump. The fluid backflow continues until the siphon leg is broken in the pump. The fluid which remains in the pump has a much lower level than results when the check valve seats properly. This lower level is defined in the industry as the pump reprime level.
  • Pump installation specifications typically specify that a pump be provided which can achieve a designated suction lift within a specified period of time with pump operation initiated at the reprime level. If a pump which has the required capacity to handle normal pumping requirements will not effect the required lift within the specified time starting at reprime level, it has been necessary to drive the pump at a higher speed to meet the reprime level starting specifications even though the larger pump capacity is not required once the pump is primed. The higher drive speed requires a higher power input which in turn requires a larger drive motor and heavier drive system components, etc.
  • a priming opening communicates lower regions of the separation chamber and the volute. During priming, fluid is drawn through this opening from the separation chamber into the pump impeller where it mixes with air from the suction chamber.
  • the present invention relates to an improved selfpriming centrifugal pump capable of achieving substantially improved suction lift in substantially less time than has been possible with known self-priming centrifugal pumps.
  • Pumps constructed in accordance with the present invention have been shown to exhibit vastly improved reprime capabilities.
  • a 4-inch pump constructed in accordance with the referenced CENTRIFUGAL PUMP patent will effect a reprime lift of about 19 feet in 5 minutes time when driven at a speed of i750 RPM.
  • An identical pump provided with the improvements of the present invention has been shown in tests to effect a reprime lift of about 26 feet in l minute time when driven at the same speed.
  • Corresponding improvements in reprime lift and priming rate occur across the full range of pump operating speeds.
  • the improvements of the present invention relate to an improved configuration of the priming passage which communicates lower regions of the separation chamber and the volute, and to an improved configuration of the lower volute region. These improvements cooperate to substantially improve the self-priming ca pability of the pump.
  • the priming passage is defined by an elbow-shaped conduit having an inlet opening in the separation chamber and an outlet opening in the volute.
  • the conduit defines a non-restricted passage of sufficient size to pass such solids as are present in the fluid.
  • the lower region of the pump volute is provided with a ramp-like shoulder which directs fluid entering from the priming passage upwardly and into the impeller.
  • This shoulder has been found to substantially improve pump reprime performance. It is believed the shoulder contributes to the development and maintenance of a turbulent air-fluid mixing action in the pump impeller during pump priming, whereby air is more efficiently evacuated from the suction chamber than has been possible with prior pump designs.
  • Still another feature of the present invention relates to the orientation of the priming passage inlet opening.
  • Fluids in the separation chamber normally circulate along a flow path which corresponds to the direction of fluid travel established as fluid is impelled through the volute.
  • the priming passage inlet opening is positioned beside the normal fluid flow path in the separation chamber and is oriented such that fluid entering the inlet opening from the flow path must at least partially reverse their direction of flow.
  • the inlet opening is oriented to face opposite the direction of flow whereby entering fluids must effect a full l direction reversal to enter the reprime passage.
  • the 180 entering direction change combines with the turn encountered by the fluids in traversing the reprime passage, and with the upward turn of about 90 as the fluids enter the impeller to provide a full 360 of tortuous turns. It is believed that the effect of this tortuous flow path is to reduce the pressure of the fluid which enters the impeller. whereby a more continuous and larger flow of fluid is delivered to the impeller and an improved pump-priming performance results.
  • FIG. 1 is a cross-sectional view of an improved cen trifugal pump constructed in accordance with the present invention
  • FIG. 2 is a cross sectional view on a reduced scale as seen from the plane indicated by the line 22 in FIG. I;
  • FIG. 3 is a perspective view on an enlarged scale of lower portions of the pump, upper portions being broken away to permit several features of the present invention to be illustrated with greater clarity.
  • a self-priming centrifugal pump is shown generally at 10.
  • the pump includes a casing 11 having a front wall 12, a rear wall 13, a partition wall 14, a top wall 15, and a bottom wall 16.
  • the partition wall 14 extends generally vertically and cooperates with the other casing walls to define separate side-by side suction and separation chambers l7, 18. Lower portions of the partition wall 14 form a wall 19 which is arcuate in transverse cross section. As best seen in FIG. 2. the wall 19 circumferentially defines a volute 20. A reinforcing strut ZI extends through the separation chamber [8 and connects the circumferential wall 19 to the rear wall 13.
  • An inlet fitting 22 is secured to the front wall 12 and communicates with the suction chamber 17.
  • a check valve 23 is provided adjacent the inlet fitting to prevent the backflow of fluid from the suction chamber 17.
  • the check valve 23 normally seats against an annular surface 24 formed on the inlet fitting 22.
  • An outlet fitting 25 is secured to the top wall l5 and communicates with the separation chamber 18.
  • a rotatable impeller 26 is positioned in the volute 20 and is mounted on a drive shaft 27.
  • the impeller drive shaft 27 is journaled for rotation by an assembly 30 which is removably carried in the casing 11.
  • the assembly 30 includes a generally cylindrical housing 31 having front and rear radially extending mounting flanges 32, 33. Front and rear ball bearings 34, 35 are carried in the housing 31 and journal the drive shaft for rotation.
  • the flanges 32. 33 have circumferentially extending grooves formed therein which carry O-rings 36, 37.
  • Axially aligned openings 40, 41 are formed through the front wall 12 and through forward portions of the circumferential wall 19 to permit the impeller 26 and its bearing assembly 30 to be installed as an assembled unit in the casing 11.
  • a disc-shaped cover 42 closes the opening 40.
  • Spaced projections 43 formed integrally with the cover 42 extend through the suction chamber 17 toward the impeller 26.
  • An annular ring assembly 44 is secured by threaded fasteners 45 to the projections 43.
  • the ring assembly 44 fits snugly within the opening 41 and provides a central opening 46 for admitting fluid from the suction chamber 17 to the impeller 26.
  • a threaded drain opening 50 is provided in the lower region of the front wall 12.
  • a drain plug 51 is threaded into the opening 50.
  • a drain passage 52 extends from the threaded opening 50 to an opening 53 which com municates with the volute 20.
  • the improvements of the present invention relate to the configuration ofa priming passage which communicates the lower region of the separation chamber 18 with the lower region of the volute 20.
  • an elbow-shaped conduit is cast integrally with the bottom wall 16 and the circumferential wall 19.
  • the conduit extends from an inlet opening 61 in the separation chamber 18, to an outlet opening 63 in the volute 20.
  • the conduit 60 preferably tapers upwardly slightly from the region of the inlet opening 6], as is best seen in FIG. I, and provides a non-restricted channel including a 90 turn which directs fluid into a sump 62 formed in the lower region of the volute 20.
  • a raised. ramp-like shoulder is provided in the lower region of the volute 20 at a position near to and spaced slightly downstream from the outlet opening 63 adjacent one side of the sump 62. While the shoulder 65 can extend substantially vertically, it is preferably inclined from the vertical, as indicated in FIG. 2 by the angle A," within the range of about 5 to about 35. The preferred range is about 15 to 30, with the most preferred angle of inclination being in the range of about 20 to about 25 from the vertical.
  • the shoulder 65 is believed to assist in directing fluids from the sump 62 upwardly and into the region of operation of the impeller 26 during pump priming. It has been found that the shoulder 65 does not interfere with hydraulic flow in the volute 20 during normal (fully primed) pump operation, and that it does add measurably to reprime performance of the pump.
  • the fluids circulate through the volute 20 as indicated by the arrows and discharge into the separation chamber 18. After the pump has reached an equilibrium operating condition, most of the fluid is discharged directly through the outlet fitting 25. Some fluid circulation occurs in the separation chamber 18, as indicated by the arrows 71, 72.
  • the check valve 23 When the pump 10 is shut down, the check valve 23 normally seats against the surface 24 and prevents backflow of fluid from the suction chamber 17. If the valve 23 fails to seat properly due to damage or to the presence of debris across the seating surface 24, fluid will backflow from the suction chamber [7 through the inlet fitting 22. This backflow or siphoning action will continue until the siphon leg is broken in the pump.
  • the level of the fluid remaining in the pump is known as the pump reprime level.
  • the improvements of the present invention facilitate the rapid evacuation of air from the suction chamber so that pump priming takes place in minimal time.
  • Fluid from the separation chamber 18 is drawn through the conduit 60 and directed upwardly by the shoulder 65 into the impeller.
  • the tortuous flow path followed by the fluid in entering the conduit 60, traversing the length of the conduit, and turning upwardly over the shoulder 65 into the impeller is believed to cause the fluid entering the impeller to have a lower presure than is achieved in pumps constructed in accordance with the referenced CENTRIFUGAL PUMP patent.
  • This lower pressure of entering pump fluid is believed to draw more fluid into the impeller and to provide a better mixing of fluid with air from the suction chamber.
  • the mixed air and fluid is then exhausted from the volute into the separation chamber 18.
  • the exhausted fluid separates from the entrained air and travels back into the lower region of the separation chamber along the path indicated by the arrows 71.
  • the fluid then reenters the conduit 60 and recirculates through the im' peller 26 to mix with and pump more air out of the suction chamber 17. This recirculation continues to effect a rapid evacuation of air from the suction chamber 17, whereby a new supply of fluid is drawn in through the inlet fitting 22 and the pump reprimes.
  • a self-priming centrifugal pump capable of handling fluid containing solids comprising:
  • volute in said casing and having a peripheral discharge opening in its upper portion, a priming opening in its lower portion, and a suction opening;
  • a rotatable impeller positioned in said volute and being operable when rotated to draw fluid through said suction opening and discharge it through said discharge opening;
  • a priming passage communicating with said priming opening and defining a conduit which requires fluid passing therethrough to change its direction of flow before entering said volute;
  • said volute is arranged to discharge fluid into said separation chamber in a manner which will establish a fluid circulation in said separation chamber 5 along a predetermined flow path;
  • said priming passage defines an inlet opening in said separation chamber facing away from the direction of fluid flow along said flow path whereby fluid entering said inlet opening from said flow path must at least partially reverse its direction of flow.
  • a self-priming centrifugal pump capable of handling fluids containing solids. comprising:
  • volute in said casing having a suction opening communicating with said suction chamber and a peripheral discharge opening communicating with said separation chamber;
  • an impeller journaled for rotation within said cas ing and positioned in said volute to draw fluid from said suction chamber through said suction opening and discharge it through said discharge opening into said separation chamber;
  • a priming passage communicating the lower region of said separation chamber and the lower region of said volute and defining a conduit of sufficiently large cross section to pass such solids as may be present in the fluid;
  • conduit defining an inlet opening in said separation chamber and an outlet opening in said volute beneath said impeller;
  • conduit defines a non-restricted turn intermediate said inlet and outlet openings which requires fluid passing therethrough to execute a turn of at least about 90 degrees before entering said volute.
  • said volute is arranged to discharge fluid into said separation chamber in a manner which will establish a fluid circulation in said separation chamber along a predetermined flow path;
  • said faces inlet opening faces away from the direction of fluid flow along said flow path whereby fluid entering said inlet opening from said flow path must at least partially reverse its direction of flow.
  • a self-priming centrifugal pump comprising a casing. a volute in said casing formed on a single spiral curve and having a suction opening a peripheral discharge opening in its upper portion and a priming opening in its lower portion. a rotatable impeller arranged in said volute to draw fluid through said suction opening into the center of said impeller and discharge the fluid through said discharge opening and an upstanding ramp-like shoulder formed in the lower portion of said volute adjacent to and downstream from said priming opening, said shoulder being arranged to direct fluid entering said volute through said priming opening upwardly into said impeller 13.
  • a self-priming centrifugal pump according to claim 12 including a priming passage communicating with said priming opening and extending from said vo lute. said priming passage having an inlet which faces away from the direction of fluid circulation in said cas ing so that fluid entering said passage is caused to at least partially reverse its direction of flow.
  • a self-priming pump according to claim 13 in which said passage has a bend of about 90 between its inlet and said priming opening.
  • a self-priming centrifugal pump according to claim 13 in which said ramp-like shoulder defines a fluid deflecting surface inclined from the vertical at an angle in the range of from about to about 35.
  • a self-priming centrifugal pump comprising a casing having a suction inlet, a separation chamber and an outlet a volute in said casing formed on a single spiral curve and having a central suction opening, a pcripheral discharge opening in its upper portion and a priming opening in its lower portion, a rotatable impel Lit ler arranged in said volute to draw fluid through said suction opening into the center of said impeller and discharage the fluid through said discharge opening, a ramp-like shoulder formed in the lower portion of said volute and having a fluid deflecting surface adjacent to and downstream from said priming opening, said su rface being inclined to the vertical in order to direct fluid entering said volute through said priming opening upwardly into said impeller, and a priming passage communicating with said priming opening and extending from said volute through a bend of about said passage having an inlet facing away from the direction of fluid circulation in said separation chamber so that fluid entering said passage is caused to at least partially reverse its direction of flow.
  • a self-priming centrifugal pump comprising a casing, a volute in said casing having a suction opening, a peripheral discharge opening in its upper portion and a priming opening in its lower portion, a rotatable impeller arranged in said volute to draw fluid through said suction opening into the center of said impeller and dis charge such fluid through said discharge opening. and a conduit defining a priming passage communicating with said priming opening and having an inlet facing away from the direction of fluid circulation in said casing so that fluid entering said passage is caused to at least partially reverse its direction of flow.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US411262A 1973-10-31 1973-10-31 Self-priming centrifugal pump Expired - Lifetime US3898014A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US411262A US3898014A (en) 1973-10-31 1973-10-31 Self-priming centrifugal pump
AU72588/74A AU476857B2 (en) 1973-10-31 1974-08-22 Self-priming centrifugal pump
ZA00745463A ZA745463B (en) 1973-10-31 1974-08-26 Self-priming centrifugal pump
CA207,967A CA997210A (en) 1973-10-31 1974-08-26 Self-priming centrifugal pump
GB4229474A GB1464027A (en) 1973-10-31 1974-09-30 Self-priming centrifugal pump
JP12325974A JPS5410361B2 (enrdf_load_stackoverflow) 1973-10-31 1974-10-25

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US411262A US3898014A (en) 1973-10-31 1973-10-31 Self-priming centrifugal pump

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US3898014A true US3898014A (en) 1975-08-05

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US411262A Expired - Lifetime US3898014A (en) 1973-10-31 1973-10-31 Self-priming centrifugal pump

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US (1) US3898014A (enrdf_load_stackoverflow)
JP (1) JPS5410361B2 (enrdf_load_stackoverflow)
AU (1) AU476857B2 (enrdf_load_stackoverflow)
CA (1) CA997210A (enrdf_load_stackoverflow)
GB (1) GB1464027A (enrdf_load_stackoverflow)
ZA (1) ZA745463B (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4661041A (en) * 1985-11-05 1987-04-28 Itt Corporation Self-draining pump arrangement
US5102607A (en) * 1991-01-14 1992-04-07 Gsw Inc. Method for molding products with undercut regions
US6799943B2 (en) 2000-01-26 2004-10-05 The Gorman-Rupp Company Centrifugal pump with multiple inlets
US20050013689A1 (en) * 2000-01-26 2005-01-20 The Gorman-Rupp Company Centrifugal pump with multiple inlets
US6887034B2 (en) 2000-05-19 2005-05-03 The Gorman-Rupp Company Centrifugal pump having adjustable clean-out assembly
US20100092276A1 (en) * 2008-09-30 2010-04-15 John Cartwright Chopper pump
US20100172751A1 (en) * 2007-06-01 2010-07-08 Scott Thomas M Pump and pump impeller
CN102022342A (zh) * 2010-11-30 2011-04-20 浙江大学 便捷污水自吸离心泵
US20110155938A1 (en) * 2006-03-27 2011-06-30 Koenig Kevin J Pump header and implementation thereof
US20150118024A1 (en) * 2013-10-24 2015-04-30 Bryce Thiel Centrifugal pump with self-cleaning wear plate
EP2980411A1 (en) * 2014-07-29 2016-02-03 Honda Motor Co., Ltd. Centrifugal pump
CN107435639A (zh) * 2016-05-25 2017-12-05 大井泵浦工业股份有限公司 抽水泵结构
CN109578288A (zh) * 2019-01-02 2019-04-05 三联泵业股份有限公司 一种气液混合型自吸式离心泵
US20190162189A1 (en) * 2017-04-10 2019-05-30 Nidec Sankyo Corporation Pump device
USD925608S1 (en) 2019-06-19 2021-07-20 The Gorman-Rupp Company Pump housing

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5361704U (enrdf_load_stackoverflow) * 1976-10-26 1978-05-25
FI118089B (fi) * 2005-12-13 2007-06-29 Metso Paper Inc Menetelmä ja laitteisto öljyn poistamiseksi taipumakompensoidusta telasta
CN110242581B (zh) * 2019-07-04 2024-08-02 安徽莱恩电泵有限公司 一种便于拆装且工作效率高的自吸泵

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2580347A (en) * 1946-10-29 1951-12-25 Barnes Mfg Company Centrifugal pump
US2627817A (en) * 1949-07-08 1953-02-10 Goulds Pumps Self-priming centrifugal pump
US3072063A (en) * 1960-04-22 1963-01-08 Gorman Rupp Co Self-priming pump
US3279386A (en) * 1965-01-21 1966-10-18 Gorman Rupp Co Centrifugal pump
US3322071A (en) * 1965-06-10 1967-05-30 Textron Inc Pump

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5146642U (enrdf_load_stackoverflow) * 1974-10-01 1976-04-06

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2580347A (en) * 1946-10-29 1951-12-25 Barnes Mfg Company Centrifugal pump
US2627817A (en) * 1949-07-08 1953-02-10 Goulds Pumps Self-priming centrifugal pump
US3072063A (en) * 1960-04-22 1963-01-08 Gorman Rupp Co Self-priming pump
US3279386A (en) * 1965-01-21 1966-10-18 Gorman Rupp Co Centrifugal pump
US3322071A (en) * 1965-06-10 1967-05-30 Textron Inc Pump

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4661041A (en) * 1985-11-05 1987-04-28 Itt Corporation Self-draining pump arrangement
US5102607A (en) * 1991-01-14 1992-04-07 Gsw Inc. Method for molding products with undercut regions
US6799943B2 (en) 2000-01-26 2004-10-05 The Gorman-Rupp Company Centrifugal pump with multiple inlets
US20050013689A1 (en) * 2000-01-26 2005-01-20 The Gorman-Rupp Company Centrifugal pump with multiple inlets
US7156614B2 (en) 2000-01-26 2007-01-02 The Gorman-Rupp Company Centrifugal pump with multiple inlets
US6887034B2 (en) 2000-05-19 2005-05-03 The Gorman-Rupp Company Centrifugal pump having adjustable clean-out assembly
US8202040B2 (en) * 2006-03-27 2012-06-19 Koenig Kevin J Pump header and implementation thereof
US20110155938A1 (en) * 2006-03-27 2011-06-30 Koenig Kevin J Pump header and implementation thereof
US20100172751A1 (en) * 2007-06-01 2010-07-08 Scott Thomas M Pump and pump impeller
US8439642B2 (en) 2007-06-01 2013-05-14 The Gorman-Rupp Company Pump and pump impeller
US20100092276A1 (en) * 2008-09-30 2010-04-15 John Cartwright Chopper pump
US8500393B2 (en) * 2008-09-30 2013-08-06 The Gorman-Rupp Company Chopper pump
CN102022342A (zh) * 2010-11-30 2011-04-20 浙江大学 便捷污水自吸离心泵
US20150118024A1 (en) * 2013-10-24 2015-04-30 Bryce Thiel Centrifugal pump with self-cleaning wear plate
EP2980411A1 (en) * 2014-07-29 2016-02-03 Honda Motor Co., Ltd. Centrifugal pump
US9903388B2 (en) 2014-07-29 2018-02-27 Honda Motor Co., Ltd. Centrifugal pump
CN107435639A (zh) * 2016-05-25 2017-12-05 大井泵浦工业股份有限公司 抽水泵结构
US20190162189A1 (en) * 2017-04-10 2019-05-30 Nidec Sankyo Corporation Pump device
US11268517B2 (en) * 2017-04-10 2022-03-08 Nidec Sankyo Corporation Pump and impeller with auxiliary blades on the underside of the impeller and a permanent magnet rotor
CN109578288A (zh) * 2019-01-02 2019-04-05 三联泵业股份有限公司 一种气液混合型自吸式离心泵
USD925608S1 (en) 2019-06-19 2021-07-20 The Gorman-Rupp Company Pump housing

Also Published As

Publication number Publication date
AU7258874A (en) 1976-02-26
JPS5078901A (enrdf_load_stackoverflow) 1975-06-27
JPS5410361B2 (enrdf_load_stackoverflow) 1979-05-04
GB1464027A (en) 1977-02-09
ZA745463B (en) 1975-08-27
AU476857B2 (en) 1976-10-07
CA997210A (en) 1976-09-21

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