US3589827A - Centrifugal leakproof fluid pump - Google Patents
Centrifugal leakproof fluid pump Download PDFInfo
- Publication number
- US3589827A US3589827A US849348A US3589827DA US3589827A US 3589827 A US3589827 A US 3589827A US 849348 A US849348 A US 849348A US 3589827D A US3589827D A US 3589827DA US 3589827 A US3589827 A US 3589827A
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- US
- United States
- Prior art keywords
- impeller
- rotor
- discs
- pump
- fluid
- Prior art date
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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
- F04D29/00—Details, component parts, or accessories
- F04D29/18—Rotors
- F04D29/22—Rotors specially for centrifugal pumps
- F04D29/2261—Rotors specially for centrifugal pumps with special measures
- F04D29/2266—Rotors specially for centrifugal pumps with special measures for sealing or thrust balance
-
- 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/041—Axial thrust balancing
- F04D29/0413—Axial thrust balancing hydrostatic; hydrodynamic thrust bearings
-
- 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
- F04D29/04—Shafts or bearings, or assemblies thereof
- F04D29/042—Axially shiftable rotors
Definitions
- the pump has a device for balancing the axial forces acting on the rotor, said device being made in the form of two partitions installed on the inner face walls of the pump casing in the spaced between these walls and the impeller discs; the sealing projection of each disc has a circular groove located on the outer surface of the projection and creating, when the rotor is shifted, an additional flow of fluid which brakes the fluid flow between the impeller disc and the partition.
- the present invention relates to centrifugal leakproof fluid pumps.
- the invention can be utilized in handling various chemically active liquids, such as liquefied gases, condensates, petroleum products, etc., whose leaks are strongly objectionable. Most efficiently, this invention can be used when it is embodied as a single-stage pump.
- the centrifugal leakproof pump known in the art comprises a device for balancing the axial forces acting on the rotor, whose shaft carries an impeller consisting of two discs with blades in between, each disc having a circular projection, sealing a gap between the casing and the disc.
- projections are made on the impeller for balancing the axial forces, acting on the rotor, the projections being made in such a manner, that relatively small gaps are made between them and the casing.
- An object of the present invention resides in eliminating the aforesaid disadvantages.
- the main object of the invention consists in providing a centrifugal leakproof pump with such a device for balancing the axial forces acting on the rotor in which there would be no friction between the bearing surfaces which would extend considerably the life of the pump.
- a centrifugal leakproof fluid pump preferably of a single stage design, comprising a device for balancing the axial forces acting on the rotor whose shaft carries an impeller having two discs with blades in between, each disc provided with a circular sealing projection;
- the device for balancing the axial forces acting on the rotor is made in the form of two partitions installed in the spaces between the inner face walls of the pump casing and the impeller discs; each sealing projection has a circular groove on its outer surface, preferably at the base of the disc and creating, while the rotor is moved by the axial forces, an additional flow of fluid, which brakes the flow of fluid between the impeller disc and the. partition, caused by the rotation of the impeller.
- the width of the circular grooves on the sealing projections of the impeller discs would be not smaller than the width of the passage between the partition and the inner face wall of the pump casing.
- the centrifugal leakproof fluid pump according to the invention has a device for balancing the axial forces acting on the rotor which is simple in design, does not require high precision in manufacture and assembly, extends the service life of the pump owing to the elimination of friction in this device, and takes the axial loads acting on the rotor within the entire range of pump capacities.
- the pump according to the invention renders reliable service both in horizontal and vertical positions.
- FIG. I is a cross section of the centrifugal leakproof singlestage fluid pump, according to the invention.
- FIG. 2 is a cross section of a part of the centrifugal leakproof single-stage pump with a device for balancing the axial forces acting on the rotor (enlarged).
- the casing 1 (FIG. 1) of the pump mounts an electric motor 2 with a rotor 3 and a stator 4.
- the shaft 5 of the rotor 3 carries an impeller 6 consisting of two discs 7 and 8 with blades 9 installed between them.
- Inside the casing 1 there is a device for balancing the axial forces acting on the rotor 3, said device made in the form of partitions 10 and 11 installed on the inner face walls 12 and 13 of the casing l in the spaces between these walls and the discs 7 and 8 of the impeller 6.
- the discs 7, 8 have circular sealing projections 18 and 19 whose outer surfaces at the base of the discs have circular grooves 20 and 21 of identical width, width b, (FIG. 2) of each groove 20 and 21 being not smaller than width b, of each of the passages 14 and 15. While the rotor 3 (FIG. 1) is being moved by the axial forces, these grooves create additional flows offluid in the casing 1.
- the casing I has a suction pipe 22 and a discharge pipe 23.
- the shaft 5 is installed in bearings 24 and 25 accommodated in a sleeve 26 which protects the pack 27 of the stator 4 with the winding 28 against the effect of the handled fluid which is used for the lubrication of said bearings.
- the pack 30 of the rotor 3 accommodated in the sleeve 26 closed with the cover 29 is protected against the effect of the handled fluid by the sleeve 31 and rings 32 and 33.
- Both sleeves 26 and 31 are made of a nonmagnetic material, and installed with a gap through which the handled fluid is delivered to the bearing 25.
- the shaft 5 at the side of the bearing 25 is mounted with a disc 34 intended to limit the axial movement of the rotor 3.
- the pump operates as follows:
- the fluid in the passages 16 and 17 is caught by the impeller discs 7 and 8 and begins rotating so that the pressure in these passages becomes nonuniform, diminishing from the periphery of the impeller 6 towards its center.
- the fluid in the passages 14 and 15 is not put in rotation so that pressure in these passages is actually constant between the periphery of the impeller 6 and its center.
- the rotation of the impeller 6 creates an axial force which shifts the rotor 3 along its axis of rotation, for instance to the left, as shown in FIG. 2.
- the passage 15 will then be put in communication with the passage 17 through the circular groove 21. Due to a difference of pressures in these passages, the fluid flows from the passage 15 downwards around the partition 10 and through the circular groove 21 into the passage 17 and, meeting a flow of fluid in it, brakes this flow. Merging of these two flows increases the pressure applied to the disc 8 of the impeller 6, and the rotor 3 with the impeller 6 is returned to the initial position. A similar process takes place when the rotor 3 with the impeller 6 is displaced to the right.
- a centrifugal leakproof, fluid single-stage pump comprising a casing, a rotor and an impeller including two axially spaced discs with blades therebetween, and installed on the shaft of said rotor, and means for balancing the axial forces acting on said rotor, said means including two fixed annular partitions installed in the spaces between the inner face walls of the pump casing and said discs of said impeller with the sides'thereof communicating with the discharge of the pump, and, two circular sealing projections on said discs of said impeller provided, each, with one circular groove on the outer surface, said grooves being located respectively at the inner portions of said discs and creating, when said rotor is shifted by the axial forces, a passage of varying restriction so that an additional flow of fluid passes in the passage between one of said discs of said impeller and one of said partitions, said axial forces being caused by rotation of the impeller.
- a pump according to claim 1 wherein the width of the circular grooves on the sealing projections of the impeller discs is at least equal to the width of the passagg between said partition and the inner wall of the pump casing.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention relates to centrifugal leakproof fluid pumps. The pump has a device for balancing the axial forces acting on the rotor, said device being made in the form of two partitions installed on the inner face walls of the pump casing in the spaced between these walls and the impeller discs; the sealing projection of each disc has a circular groove located on the outer surface of the projection and creating, when the rotor is shifted, an additional flow of fluid which brakes the fluid flow between the impeller disc and the partition.
Description
United States Patent 1,045,019 11/1912 Gottschling Inventors Sergei Stepanovich Gerasirnenko ulitsa Dimo, 21, kv. 41; Vladimir Semenovich Kurteev, ulitsa Dimitrova, 8, Korpus 2, kv. 34; Jury Kazimirovich Mitsek, ulilsa Schuseva, 37, la. 3, all of Kishlnev. U.S.S.R.
Appl. No. 849,348
Filed Aug. 12, 1969 Patented June 29, 1971 CENTRIFUGAL LEAKPROOF FLUID PUMP 2 Claims, 2 Drawing Figs.
U.S. C1 415/106, 417/365 Int. Cl. ..F 04d 29/66,
References Cited. UNITED STATES PATENTS 3,160,108 12/1964 Sence 415/106 3,253,816 5/1966 Sproule 103/111 3,265,001 8/1966 Detters..... 103/111 3,364,866 1/1968 Sato 103/112 FOREIGN PATENTS 580,639 7/1933 Germany 103/109 582,832 8/1933 Germany 103/109 Primary Examiner-Henry F. Raduazo Attorney-Waters, Roditi, Schwartz & Nissen ABSTRACT: The invention relates to centrifugal leakproof fluid pumps. The pump has a device for balancing the axial forces acting on the rotor, said device being made in the form of two partitions installed on the inner face walls of the pump casing in the spaced between these walls and the impeller discs; the sealing projection of each disc has a circular groove located on the outer surface of the projection and creating, when the rotor is shifted, an additional flow of fluid which brakes the fluid flow between the impeller disc and the partition.
CENTRIFUGAL LEAKPROOF FLUID PUMP The present invention relates to centrifugal leakproof fluid pumps. The invention can be utilized in handling various chemically active liquids, such as liquefied gases, condensates, petroleum products, etc., whose leaks are strongly objectionable. Most efficiently, this invention can be used when it is embodied as a single-stage pump.
The centrifugal leakproof pump known in the art comprises a device for balancing the axial forces acting on the rotor, whose shaft carries an impeller consisting of two discs with blades in between, each disc having a circular projection, sealing a gap between the casing and the disc. In this pump, projections are made on the impeller for balancing the axial forces, acting on the rotor, the projections being made in such a manner, that relatively small gaps are made between them and the casing. When the rotor is moved by theaxial forces one of said gaps is reduced, and simultaneously the liquid being handled creates increased pressure in the space adjacent to said gap. Under the action of this pressure the rotor together with the impeller is moved to the opposite direction (see, for example, the pump produced by KSB, type CM, Federal Republic of Germany). However, the axial clearances in the bearing pivot of the known pump are small, therefore its parts have to be manufactured and assembled with a high degree of precision. Moreover, the bearing pivot operates in contact with the fluid handled, this fluid not possessing, as a rule, lubricating properties; therefore, in view of small axial clearances, friction is occasioned between the bearing surfaces which leads to their rapid wear.
An object of the present invention resides in eliminating the aforesaid disadvantages.
The main object of the invention consists in providing a centrifugal leakproof pump with such a device for balancing the axial forces acting on the rotor in which there would be no friction between the bearing surfaces which would extend considerably the life of the pump.
This object is achieved by providing a centrifugal leakproof fluid pump, preferably of a single stage design, comprising a device for balancing the axial forces acting on the rotor whose shaft carries an impeller having two discs with blades in between, each disc provided with a circular sealing projection; according to the invention, the device for balancing the axial forces acting on the rotor is made in the form of two partitions installed in the spaces between the inner face walls of the pump casing and the impeller discs; each sealing projection has a circular groove on its outer surface, preferably at the base of the disc and creating, while the rotor is moved by the axial forces, an additional flow of fluid, which brakes the flow of fluid between the impeller disc and the. partition, caused by the rotation of the impeller.
It is desirable, that the width of the circular grooves on the sealing projections of the impeller discs would be not smaller than the width of the passage between the partition and the inner face wall of the pump casing.
The centrifugal leakproof fluid pump according to the invention has a device for balancing the axial forces acting on the rotor which is simple in design, does not require high precision in manufacture and assembly, extends the service life of the pump owing to the elimination of friction in this device, and takes the axial loads acting on the rotor within the entire range of pump capacities. The pump according to the invention renders reliable service both in horizontal and vertical positions.
Now the invention will be described in detail by way of example with reference .to the accompanying drawings, in which:
FIG. I is a cross section of the centrifugal leakproof singlestage fluid pump, according to the invention;
FIG. 2 is a cross section of a part of the centrifugal leakproof single-stage pump with a device for balancing the axial forces acting on the rotor (enlarged).
- The casing 1 (FIG. 1) of the pump mounts an electric motor 2 with a rotor 3 and a stator 4. The shaft 5 of the rotor 3 carries an impeller 6 consisting of two discs 7 and 8 with blades 9 installed between them. Inside the casing 1 there is a device for balancing the axial forces acting on the rotor 3, said device made in the form of partitions 10 and 11 installed on the inner face walls 12 and 13 of the casing l in the spaces between these walls and the discs 7 and 8 of the impeller 6. There are passages 14 and 15 between the partitions l0 and 11 and the face walls 12 and 13, whereas there are passages 16 and 17 between the discs 7, 8 and the same partitions.
The discs 7, 8 have circular sealing projections 18 and 19 whose outer surfaces at the base of the discs have circular grooves 20 and 21 of identical width, width b, (FIG. 2) of each groove 20 and 21 being not smaller than width b, of each of the passages 14 and 15. While the rotor 3 (FIG. 1) is being moved by the axial forces, these grooves create additional flows offluid in the casing 1.
The casing I has a suction pipe 22 and a discharge pipe 23.
The shaft 5 is installed in bearings 24 and 25 accommodated in a sleeve 26 which protects the pack 27 of the stator 4 with the winding 28 against the effect of the handled fluid which is used for the lubrication of said bearings. The pack 30 of the rotor 3 accommodated in the sleeve 26 closed with the cover 29 is protected against the effect of the handled fluid by the sleeve 31 and rings 32 and 33. Both sleeves 26 and 31 are made of a nonmagnetic material, and installed with a gap through which the handled fluid is delivered to the bearing 25. The shaft 5 at the side of the bearing 25 is mounted with a disc 34 intended to limit the axial movement of the rotor 3.
The pump operates as follows:
As the winding 28 of a stator 4 is energized, the rotor 3 starts rotating with the impeller 6. The fluid entering the suction pipe 22 is delivered by the impeller 6 into the discharge pipe 23 from which part of the fluid is taken off through the pipe 35 for cooling the electric motor 2 and lubricating the bearings 24 and 25.
The fluid in the passages 16 and 17, is caught by the impeller discs 7 and 8 and begins rotating so that the pressure in these passages becomes nonuniform, diminishing from the periphery of the impeller 6 towards its center. The fluid in the passages 14 and 15 is not put in rotation so that pressure in these passages is actually constant between the periphery of the impeller 6 and its center.
The rotation of the impeller 6 creates an axial force which shifts the rotor 3 along its axis of rotation, for instance to the left, as shown in FIG. 2.
The passage 15 will then be put in communication with the passage 17 through the circular groove 21. Due to a difference of pressures in these passages, the fluid flows from the passage 15 downwards around the partition 10 and through the circular groove 21 into the passage 17 and, meeting a flow of fluid in it, brakes this flow. Merging of these two flows increases the pressure applied to the disc 8 of the impeller 6, and the rotor 3 with the impeller 6 is returned to the initial position. A similar process takes place when the rotor 3 with the impeller 6 is displaced to the right.
We claim:
1. A centrifugal leakproof, fluid single-stage pump comprising a casing, a rotor and an impeller including two axially spaced discs with blades therebetween, and installed on the shaft of said rotor, and means for balancing the axial forces acting on said rotor, said means including two fixed annular partitions installed in the spaces between the inner face walls of the pump casing and said discs of said impeller with the sides'thereof communicating with the discharge of the pump, and, two circular sealing projections on said discs of said impeller provided, each, with one circular groove on the outer surface, said grooves being located respectively at the inner portions of said discs and creating, when said rotor is shifted by the axial forces, a passage of varying restriction so that an additional flow of fluid passes in the passage between one of said discs of said impeller and one of said partitions, said axial forces being caused by rotation of the impeller.
2. A pump according to claim 1 wherein the width of the circular grooves on the sealing projections of the impeller discs is at least equal to the width of the passagg between said partition and the inner wall of the pump casing.
Claims (2)
1. A centrifugal leakproof, fluid single-stage pump comprising a casing, a rotor and an impeller including two axially spaced discs with blades therebetween, and installed on the shaft of said rotor, and means for balancing the axial forces acting on said rotor, said means including two fixed annular partitions installed in the spaces between the inner face walls of the pump casing and said discs of said impeller with the sides thereof communicating with the discharge of the pump, and, two circular sealing projections on said discs of said impeller provided, each, with one circular groove on the outer surface, said grooves being located respectively at the inner portions of said discs and creating, when said rotor is shifted by the axial forces, a passage of varying restriction so that an additional flow of fluid passes in the passage between one of said discs of said impeller and one of said partitions, said axial forces being caused by rotation of the impeller.
2. A pump according to claim 1 wherein the width of the circular grooves on the sealing projections of the impeller discs is at least equal to the width of the passage between said partition and the inner wall of the pump casing.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US84934869A | 1969-08-12 | 1969-08-12 |
Publications (1)
Publication Number | Publication Date |
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US3589827A true US3589827A (en) | 1971-06-29 |
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ID=25305610
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US849348A Expired - Lifetime US3589827A (en) | 1969-08-12 | 1969-08-12 | Centrifugal leakproof fluid pump |
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US (1) | US3589827A (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4782740A (en) * | 1986-05-28 | 1988-11-08 | Co-Ordinated Railway Services, Inc. | Piston and shaft assembly for an end-of-car cushioning unit |
US4793777A (en) * | 1986-03-21 | 1988-12-27 | Ernst Hauenstein | Centrifugal pump with auxiliary impeller operatively associated with a primary impeller to balance the forces on the opposite sides thereof |
WO2000066894A1 (en) * | 1999-04-30 | 2000-11-09 | Technology Commercialization Corp. | Method and device for reducing axial thrust in rotary machines and a centrifugal pump using same |
US20060057003A1 (en) * | 2004-09-15 | 2006-03-16 | Mitsubishi Heavy Industries, Ltd. | Sealless pump |
US20090322033A1 (en) * | 2008-06-25 | 2009-12-31 | Dresser-Rand Company | Shaft isolation seal |
FR3008749A1 (en) * | 2013-07-22 | 2015-01-23 | Snecma | CENTRIFUGAL PUMP, ESPECIALLY FOR FEEDER ENGINES |
WO2017100291A1 (en) | 2015-12-07 | 2017-06-15 | Fluid Handling Llc | Opposed impeller wear ring undercut to offset generated axial thrust in multi-stage pump |
WO2018078239A1 (en) * | 2016-10-27 | 2018-05-03 | Arianegroup Sas | Impeller for centrifugal pump, centrifugal pump and manufacturing method |
US20180291928A1 (en) * | 2017-04-09 | 2018-10-11 | Technology Commercialization Corp. | Methods and devices for reducing circumferential pressure imbalances in an impeller side cavity of rotary machines |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1045019A (en) * | 1912-03-01 | 1912-11-19 | Thomas P Kingsford | Automatic balancing device for rotors of pumps, turbines, blowers, and the like. |
DE580639C (en) * | 1933-07-14 | Otto Parnow | Centrifugal pump with several stages in one wheel | |
DE582832C (en) * | 1933-08-23 | Otto Parnow | Centrifugal pump with several stages in one wheel | |
US3160108A (en) * | 1962-08-27 | 1964-12-08 | Allis Chalmers Mfg Co | Thrust carrying arrangement for fluid handling machines |
US3253816A (en) * | 1965-03-12 | 1966-05-31 | Dominion Eng Works Ltd | De-aeration of sealing fluid in aerated rotary fluid machines |
US3265001A (en) * | 1964-04-24 | 1966-08-09 | Red Jacket Mfg Company | Centrifugal pump |
US3364866A (en) * | 1964-08-17 | 1968-01-23 | Teikoku Denki Seisakusho Kk | Device for lubricating pump bearings and balancing axial thrust thereof |
-
1969
- 1969-08-12 US US849348A patent/US3589827A/en not_active Expired - Lifetime
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE580639C (en) * | 1933-07-14 | Otto Parnow | Centrifugal pump with several stages in one wheel | |
DE582832C (en) * | 1933-08-23 | Otto Parnow | Centrifugal pump with several stages in one wheel | |
US1045019A (en) * | 1912-03-01 | 1912-11-19 | Thomas P Kingsford | Automatic balancing device for rotors of pumps, turbines, blowers, and the like. |
US3160108A (en) * | 1962-08-27 | 1964-12-08 | Allis Chalmers Mfg Co | Thrust carrying arrangement for fluid handling machines |
US3265001A (en) * | 1964-04-24 | 1966-08-09 | Red Jacket Mfg Company | Centrifugal pump |
US3364866A (en) * | 1964-08-17 | 1968-01-23 | Teikoku Denki Seisakusho Kk | Device for lubricating pump bearings and balancing axial thrust thereof |
US3253816A (en) * | 1965-03-12 | 1966-05-31 | Dominion Eng Works Ltd | De-aeration of sealing fluid in aerated rotary fluid machines |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4793777A (en) * | 1986-03-21 | 1988-12-27 | Ernst Hauenstein | Centrifugal pump with auxiliary impeller operatively associated with a primary impeller to balance the forces on the opposite sides thereof |
US4782740A (en) * | 1986-05-28 | 1988-11-08 | Co-Ordinated Railway Services, Inc. | Piston and shaft assembly for an end-of-car cushioning unit |
WO2000066894A1 (en) * | 1999-04-30 | 2000-11-09 | Technology Commercialization Corp. | Method and device for reducing axial thrust in rotary machines and a centrifugal pump using same |
US20060057003A1 (en) * | 2004-09-15 | 2006-03-16 | Mitsubishi Heavy Industries, Ltd. | Sealless pump |
US7785082B2 (en) * | 2004-09-15 | 2010-08-31 | Mitsubishi Heavy Industries, Ltd | Sealless pump |
US20090322033A1 (en) * | 2008-06-25 | 2009-12-31 | Dresser-Rand Company | Shaft isolation seal |
US8146922B2 (en) | 2008-06-25 | 2012-04-03 | Dresser-Rand Company | Shaft isolation seal |
US10167874B2 (en) | 2013-07-22 | 2019-01-01 | Arianegroup Sas | Centrifugal pump, in particular for supplying power to rocket engines |
WO2015011366A3 (en) * | 2013-07-22 | 2015-03-26 | Snecma | Centrifugal pump, in particular for supplying power to rocket engines |
FR3008749A1 (en) * | 2013-07-22 | 2015-01-23 | Snecma | CENTRIFUGAL PUMP, ESPECIALLY FOR FEEDER ENGINES |
WO2017100291A1 (en) | 2015-12-07 | 2017-06-15 | Fluid Handling Llc | Opposed impeller wear ring undercut to offset generated axial thrust in multi-stage pump |
CN108496010A (en) * | 2015-12-07 | 2018-09-04 | 流体处理有限责任公司 | Opposed type impeller abrasion-proof ring for offsetting the axial thrust generated in multistage pump is undercut |
EP3387262A4 (en) * | 2015-12-07 | 2019-07-24 | Fluid Handling LLC. | Opposed impeller wear ring undercut to offset generated axial thrust in multi-stage pump |
US10533570B2 (en) * | 2015-12-07 | 2020-01-14 | Fluid Handling Llc | Opposed impeller wear ring undercut to offset generated axial thrust in multi-stage pump |
WO2018078239A1 (en) * | 2016-10-27 | 2018-05-03 | Arianegroup Sas | Impeller for centrifugal pump, centrifugal pump and manufacturing method |
FR3058190A1 (en) * | 2016-10-27 | 2018-05-04 | Airbus Safran Launchers Sas | WHEEL FOR CENTRIFUGAL PUMP, CENTRIFUGAL PUMP AND METHOD OF MANUFACTURE |
US20180291928A1 (en) * | 2017-04-09 | 2018-10-11 | Technology Commercialization Corp. | Methods and devices for reducing circumferential pressure imbalances in an impeller side cavity of rotary machines |
WO2018191022A1 (en) * | 2017-04-09 | 2018-10-18 | Technology Commercialization Corp. | Methods and devices for reducing circumferential pressure imbalances in an impeller side cavity of rotary machines |
US10746196B2 (en) * | 2017-04-09 | 2020-08-18 | Technology Commercialization Corp. | Methods and devices for reducing circumferential pressure imbalances in an impeller side cavity of rotary machines |
EA037381B1 (en) * | 2017-04-09 | 2021-03-23 | Текнолоджи Коммершелайзейшн Корп. | Method and device for reducing circumferential pressure imbalance in an impeller side cavity of rotary machines |
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