EP0224764A1 - Dispositif compensateur de force axiale pour pompes à fluide - Google Patents
Dispositif compensateur de force axiale pour pompes à fluide Download PDFInfo
- Publication number
- EP0224764A1 EP0224764A1 EP86115684A EP86115684A EP0224764A1 EP 0224764 A1 EP0224764 A1 EP 0224764A1 EP 86115684 A EP86115684 A EP 86115684A EP 86115684 A EP86115684 A EP 86115684A EP 0224764 A1 EP0224764 A1 EP 0224764A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sleeve
- bores
- gap
- pump
- channels
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 15
- 239000007788 liquid Substances 0.000 claims abstract description 18
- 230000035515 penetration Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/04—Antivibration arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D3/00—Machines or engines with axial-thrust balancing effected by working-fluid
- F01D3/04—Machines or engines with axial-thrust balancing effected by working-fluid axial thrust being compensated by thrust-balancing dummy piston or the like
-
- 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
- F04D29/0416—Axial thrust balancing balancing pistons
Definitions
- the invention relates to an axial thrust compensation device for a liquid pump, which essentially consists of a fixed bushing and a relief piston rotating in this bushing and firmly connected to the pump wheel shaft.
- Such devices are used in liquid pumps, in particular in multi-stage high-performance radial pumps, and have the purpose and the task of neutralizing or reducing large axial thrust forces.
- a device consists of a rotating pressure compensation or relief piston which is firmly connected to the pump impeller and which runs in a fixed sleeve without contact.
- the sleeve can be designed as a separate part that is firmly connected to the housing, but also as a part that is directly machined onto the pump housing.
- the relief piston itself can be formed as part of the pump rotor shaft or rigidly connected to the rotor shaft as a separate part.
- the axial thrust compensation device is arranged downstream of the last stage in the direction of the following pump stages.
- the pressure conditions in the area of the axial thrust compensating device in the liquid are such that, in the operating state, working liquid constantly flows from the impeller side space to and through the gap between the bushing and the relief piston.
- This liquid is set in rotation in the impeller side space, the intensity of which increases with the flow rate through the gap.
- the working medium therefore enters the gap with a peripheral component. This rotation of the working fluid can interfere with the maximum performance of the pump by increasing the tendency of the rotor to self-oscillate.
- the object of the invention is to completely prevent the impeller-side penetration of liquid with pre-rotation into the gap and to supply liquid without pre-rotation to the gap without complex additional devices.
- the invention as characterized in the claims, solves this problem with the aid of the flowing partial flow from the gap into the impeller side space. Since only pre-rotation-free liquid is fed into the gap via the channels, the rotational movement of the liquid through the gap into the gap space facing away from the pump wheel is reduced, which in turn reduces the tendency of the pump rotor to natural vibrations in the limit load range and thus permits higher pump outputs with the same dimensions of the pump rotor shaft .
- a device according to the invention has particular advantages for multi-stage, high-speed high-pressure radial pumps such as Boiler feed pumps.
- the figure shows schematically in section a part of the last two stages of a radial pump with an axial thrust compensation device.
- the schematic section through the housing and rotor of the last two stages of a radial pump shows the one-part or multi-part, fixed pump housing 1 and the two pump wheels 2, 3, which are rigidly connected to the pump wheel shaft 4.
- the direction of flow of the liquid in the channels 22, 23 of the pump wheels 2, 3, in the pump wheel adjoining rooms 12, 21, 31 and in the main flow channels 11 is indicated by arrows.
- the axial thrust compensation device consists of the bush 5, which is fixedly connected to the housing, and the relief piston 6, which is rigidly connected to the rotor shaft 4 and rotates in the bush 5.
- the sleeve 5 has bores 51, only one of which is shown, which open into an internal groove 52, which in turn opens into the gap 56 between the sleeve 5 and the relief piston 6.
- the bores in the recess 15 are connected to the wheel side space 31 on the outside of the bush 5.
- the outer and inner diameter (D2, D1) of the sleeve 5 and the outer diameter (D3) of the relief piston 6 the flow conditions in this area as shown by the arrows.
- the embodiment of the invention suitable for a particular type of pump can be determined by a pump specialist without any problems.
- the working fluid flows in a secondary flow from the pump wheel 32 into the wheel side space 31.
- the working fluid flows in the pump wheel side space 31 radially to the opening of the gap 56 between the bushing 5 and 5 on the pump wheel side Relief piston 6 of the axial thrust compensation device 5, 6.
- the working fluid experiences in the wheel side space 31 a rotational movement in the direction of rotation of the pump wheel 3, a so-called before rotation. The pre-rotation becomes stronger, the greater the amount of liquid flowing to the gap 56.
- the inflow of working fluid with pre-rotation to the end of the gap 56 on the pump wheel side is completely eliminated by using the Radial bores 51 and groove 52 pre-rotation-free working fluid is fed to the gap 56 between the two ends of the gap.
- Part of the liquid flowing through holes 51 and 52 groove (Q2) flows back through the gap 56 in the impeller side space and thus causes a complete locking effect, so that no liquid with pre-rotation can penetrate into the gap 56. Since the aim of the invention is to reduce the rotation of the liquid in the gap 56, it is also conceivable that the bores 51 are not arranged in the radial direction but in the direction opposite to the direction of rotation of the pump, which additionally reduces the rotation of the working fluid in the gap 56 becomes.
- the groove 52 has the task of uniformly supplying the working fluid to the gap 56 over the circumference of the compensating piston 6 and thus, seen over the circumference, to create pressure conditions which are as balanced as possible. However, it is also conceivable that the groove 52 is completely absent and the bores 51 open directly into the gap 56.
- the working fluid is supplied to the bores 51 via the recess 15.
- the recess 15 is missing and the bores 51 are connected directly to the pump wheel side space 31 by lateral bores in the bushing 5 (not shown here) or inclined bores in the housing 1.
- the rotation of the pump wheel 3 generates a rotating flow of the working fluid in the wheel side space 31 and thus an outward radial pressure gradient.
- the ratios must now be selected so that, in the operating state, the radial pressure difference in the side space 31 between the outer and inner diameter of the bushing (D2, D1) is greater than the pressure loss in the bores 51 and groove 52 at a flow rate (Q 1) alone, ie that part of the flow (Q) that flows in the gap 56 to the end of the gap 56 facing away from the pump wheel. If this condition is met, a ram flow (Q2) flows from the mouth to the pump-wheel-side gap end into the wheel-side space 31, which at the same time completely prevents the penetration of working fluid with pre-rotation into the gap 56.
- a high-speed, multi-stage high-pressure radial pump can be achieved, for example, if the ratio of the outer to inner diameter of the sleeve (D2 / D1) is less than or equal to 1.25, and the sum of the cross sections of the radial bores 51 is at least three times larger than the cross section of the Gap 56 is, and if the radial bores 51 are made only a few millimeters apart, near the end face 50.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
- Rotary Pumps (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH5066/85A CH669241A5 (de) | 1985-11-27 | 1985-11-27 | Axialschub-ausgleichsvorrichtung fuer fluessigkeitspumpe. |
CH5066/85 | 1985-11-27 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0224764A1 true EP0224764A1 (fr) | 1987-06-10 |
EP0224764B1 EP0224764B1 (fr) | 1989-05-03 |
Family
ID=4287365
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP86115684A Expired EP0224764B1 (fr) | 1985-11-27 | 1986-11-12 | Dispositif compensateur de force axiale pour pompes à fluide |
Country Status (5)
Country | Link |
---|---|
US (1) | US4892459A (fr) |
EP (1) | EP0224764B1 (fr) |
CH (1) | CH669241A5 (fr) |
DE (1) | DE3663165D1 (fr) |
FI (1) | FI93259C (fr) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2687429A1 (fr) * | 1992-02-17 | 1993-08-20 | Alsthom Gec | Procede et dispositif pour supprimer l'instabilite d'une turbine a vapeur. |
DE4313455A1 (de) * | 1993-04-24 | 1994-10-27 | Klein Schanzlin & Becker Ag | Radialer Spalt, beispielsweise einer Strömungsmaschine |
EP2154332A1 (fr) * | 2008-08-14 | 2010-02-17 | Siemens Aktiengesellschaft | Réduction de la charge thermique d'un boîtier extérieur pour une turbomachine |
EP1596069A3 (fr) * | 2004-05-10 | 2010-12-29 | Hitachi Industries Co., Ltd. | Pompe centrifuge |
RU2451920C1 (ru) * | 2010-11-23 | 2012-05-27 | Открытое акционерное общество Научно-производственное объединение "Искра" | Экспериментальная установка для исследования модельных ступеней центробежных компрессоров |
WO2020065674A1 (fr) * | 2018-09-27 | 2020-04-02 | Ksb Tech Pvt. Ltd | Pompe à plusieurs étages, à optimisation de poussée axiale |
EP3896288A1 (fr) * | 2020-04-16 | 2021-10-20 | Sulzer Management AG | Pompe centrifuge pour transporter un fluide |
Families Citing this family (29)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5104284A (en) * | 1990-12-17 | 1992-04-14 | Dresser-Rand Company | Thrust compensating apparatus |
DE29500744U1 (de) * | 1995-01-18 | 1996-05-15 | Sihi Ind Consult Gmbh | Strömungsmaschine mit Entlastungskolben |
US6012898A (en) * | 1996-06-07 | 2000-01-11 | Ebara Corporation | Submerged motor pump |
JPH09324791A (ja) * | 1996-06-07 | 1997-12-16 | Ebara Corp | サブマージドモータポンプ |
US6129507A (en) | 1999-04-30 | 2000-10-10 | Technology Commercialization Corporation | Method and device for reducing axial thrust in rotary machines and a centrifugal pump using same |
US7794199B2 (en) * | 2005-05-24 | 2010-09-14 | Franklin Electric Co., Inc. | Bypass system for purging air from a submersible pump |
US20090004032A1 (en) * | 2007-03-29 | 2009-01-01 | Ebara International Corporation | Deswirl mechanisms and roller bearings in an axial thrust equalization mechanism for liquid cryogenic turbomachinery |
EP2419621A4 (fr) | 2009-04-17 | 2015-03-04 | Echogen Power Systems | Système et procédé pour gérer des problèmes thermiques dans des moteurs à turbine à gaz |
JP5681711B2 (ja) | 2009-06-22 | 2015-03-11 | エコージェン パワー システムズ インコーポレイテッドEchogen Power Systems Inc. | 1または2以上の工業プロセスでの熱流出物処理方法および装置 |
WO2011017476A1 (fr) | 2009-08-04 | 2011-02-10 | Echogen Power Systems Inc. | Pompe à chaleur avec collecteur solaire intégré |
US8613195B2 (en) | 2009-09-17 | 2013-12-24 | Echogen Power Systems, Llc | Heat engine and heat to electricity systems and methods with working fluid mass management control |
US8869531B2 (en) | 2009-09-17 | 2014-10-28 | Echogen Power Systems, Llc | Heat engines with cascade cycles |
US8096128B2 (en) | 2009-09-17 | 2012-01-17 | Echogen Power Systems | Heat engine and heat to electricity systems and methods |
US8813497B2 (en) | 2009-09-17 | 2014-08-26 | Echogen Power Systems, Llc | Automated mass management control |
US8857186B2 (en) | 2010-11-29 | 2014-10-14 | Echogen Power Systems, L.L.C. | Heat engine cycles for high ambient conditions |
US8616001B2 (en) | 2010-11-29 | 2013-12-31 | Echogen Power Systems, Llc | Driven starter pump and start sequence |
US9062898B2 (en) | 2011-10-03 | 2015-06-23 | Echogen Power Systems, Llc | Carbon dioxide refrigeration cycle |
WO2014031526A1 (fr) | 2012-08-20 | 2014-02-27 | Echogen Power Systems, L.L.C. | Circuit de fluide de travail super critique comprenant une turbopompe et une pompe de démarrage en une configuration en série |
US9118226B2 (en) | 2012-10-12 | 2015-08-25 | Echogen Power Systems, Llc | Heat engine system with a supercritical working fluid and processes thereof |
US9341084B2 (en) | 2012-10-12 | 2016-05-17 | Echogen Power Systems, Llc | Supercritical carbon dioxide power cycle for waste heat recovery |
AU2014209091B2 (en) | 2013-01-28 | 2018-03-15 | Brett A. BOWAN | Process for controlling a power turbine throttle valve during a supercritical carbon dioxide rankine cycle |
US9638065B2 (en) | 2013-01-28 | 2017-05-02 | Echogen Power Systems, Llc | Methods for reducing wear on components of a heat engine system at startup |
AU2014225990B2 (en) | 2013-03-04 | 2018-07-26 | Echogen Power Systems, L.L.C. | Heat engine systems with high net power supercritical carbon dioxide circuits |
WO2016073252A1 (fr) | 2014-11-03 | 2016-05-12 | Echogen Power Systems, L.L.C. | Gestion de poussée active d'une turbopompe à l'intérieur d'un circuit de circulation de fluide de travail supercritique dans un système de moteur thermique |
EP3121450B1 (fr) * | 2015-07-23 | 2020-09-02 | Sulzer Management AG | Pompe de transport d'un fluide présentant une viscosité variable |
US10883388B2 (en) | 2018-06-27 | 2021-01-05 | Echogen Power Systems Llc | Systems and methods for generating electricity via a pumped thermal energy storage system |
US11435120B2 (en) | 2020-05-05 | 2022-09-06 | Echogen Power Systems (Delaware), Inc. | Split expansion heat pump cycle |
MA61232A1 (fr) | 2020-12-09 | 2024-05-31 | Supercritical Storage Company Inc | Système de stockage d'énergie thermique électrique à trois réservoirs |
KR102567992B1 (ko) * | 2021-08-09 | 2023-08-18 | 터보윈 주식회사 | 베어링마모요인추력저감보정부가 적용된 공기 압축 수단 |
Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE390366C (de) * | 1924-02-18 | Paul Joseph Charles Marechal | Entlastungsvorrichtung an Turbomaschinen | |
DE407077C (de) * | 1920-11-06 | 1924-12-10 | Paul Joseph Charles Marechal | Entlastungsvorrichtung fuer Turbinen |
DE539225C (de) * | 1931-11-26 | Georg Weyland | Axialschubentlastung mittels stufenfoermiger Entlastungsscheiben | |
DE611232C (de) * | 1935-03-25 | Klein | Einrichtung zur Achsschubentlastung an Kreiselpumpen | |
US2410769A (en) * | 1941-05-07 | 1946-11-05 | Vickers Electrical Co Ltd | Turbine, turbine type compressor, and the like rotating machine |
DE922807C (de) * | 1945-03-06 | 1955-01-24 | Aeg | Einrichtung zum Ausgleich des Axialschubes mehrstufiger Kreiselpumpen |
FR1276208A (fr) * | 1960-12-14 | 1961-11-17 | Pompe sans bourrage ni presse-étoupe avec passage du liquide par une section intérieure du palier d'entrée | |
DE1147120B (de) * | 1959-10-28 | 1963-04-11 | Siemens Ag | Einrichtung zum Ausgleich des Axialschubes bei einer unter Fluessigkeit arbeitenden Kreiselpumpe |
US3393947A (en) * | 1966-04-13 | 1968-07-23 | United Aircraft Corp | Two-directional axial thrust balancer |
DE1940555A1 (de) * | 1969-08-08 | 1971-02-18 | Sp K Bjuro Projektirowaniju Ge | Zentrifugal-Hermetikpumpe |
FR2045276A5 (fr) * | 1969-04-02 | 1971-02-26 | United Aircraft Corp | |
US3614255A (en) * | 1969-11-13 | 1971-10-19 | Gen Electric | Thrust balancing arrangement for steam turbine |
FR2096412A1 (fr) * | 1970-06-22 | 1972-02-18 | Borg Warner | |
FR2264964A1 (fr) * | 1974-03-21 | 1975-10-17 | Maschf Augsburg Nuernberg Ag | Procédé pour élever la limite dynamique de puissance des turbines et des compresseurs et moyens pour sa mise en oeuvre |
FR2362286A1 (fr) * | 1976-08-18 | 1978-03-17 | Mitsui Toatsu Chemicals | Systeme d'etancheite pour une pompe composite a plusieurs etages |
US4170435A (en) * | 1977-10-14 | 1979-10-09 | Swearingen Judson S | Thrust controlled rotary apparatus |
US4493610A (en) * | 1981-10-28 | 1985-01-15 | Hitachi, Ltd. | Axial thrust balancing system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3280750A (en) * | 1964-09-17 | 1966-10-25 | Crane Co | Motor driven pump |
DE2757952C2 (de) * | 1977-12-24 | 1983-02-24 | Sihi Gmbh & Co Kg, 2210 Itzehoe | Selbstansaugende Kreiselpumpe |
-
1985
- 1985-11-27 CH CH5066/85A patent/CH669241A5/de not_active IP Right Cessation
-
1986
- 1986-10-28 FI FI864381A patent/FI93259C/fi not_active IP Right Cessation
- 1986-11-12 DE DE8686115684T patent/DE3663165D1/de not_active Expired
- 1986-11-12 EP EP86115684A patent/EP0224764B1/fr not_active Expired
-
1988
- 1988-12-13 US US07/283,612 patent/US4892459A/en not_active Expired - Lifetime
Patent Citations (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE390366C (de) * | 1924-02-18 | Paul Joseph Charles Marechal | Entlastungsvorrichtung an Turbomaschinen | |
DE539225C (de) * | 1931-11-26 | Georg Weyland | Axialschubentlastung mittels stufenfoermiger Entlastungsscheiben | |
DE611232C (de) * | 1935-03-25 | Klein | Einrichtung zur Achsschubentlastung an Kreiselpumpen | |
DE407077C (de) * | 1920-11-06 | 1924-12-10 | Paul Joseph Charles Marechal | Entlastungsvorrichtung fuer Turbinen |
US2410769A (en) * | 1941-05-07 | 1946-11-05 | Vickers Electrical Co Ltd | Turbine, turbine type compressor, and the like rotating machine |
DE922807C (de) * | 1945-03-06 | 1955-01-24 | Aeg | Einrichtung zum Ausgleich des Axialschubes mehrstufiger Kreiselpumpen |
DE1147120B (de) * | 1959-10-28 | 1963-04-11 | Siemens Ag | Einrichtung zum Ausgleich des Axialschubes bei einer unter Fluessigkeit arbeitenden Kreiselpumpe |
FR1276208A (fr) * | 1960-12-14 | 1961-11-17 | Pompe sans bourrage ni presse-étoupe avec passage du liquide par une section intérieure du palier d'entrée | |
US3393947A (en) * | 1966-04-13 | 1968-07-23 | United Aircraft Corp | Two-directional axial thrust balancer |
FR2045276A5 (fr) * | 1969-04-02 | 1971-02-26 | United Aircraft Corp | |
DE1940555A1 (de) * | 1969-08-08 | 1971-02-18 | Sp K Bjuro Projektirowaniju Ge | Zentrifugal-Hermetikpumpe |
US3614255A (en) * | 1969-11-13 | 1971-10-19 | Gen Electric | Thrust balancing arrangement for steam turbine |
FR2096412A1 (fr) * | 1970-06-22 | 1972-02-18 | Borg Warner | |
FR2264964A1 (fr) * | 1974-03-21 | 1975-10-17 | Maschf Augsburg Nuernberg Ag | Procédé pour élever la limite dynamique de puissance des turbines et des compresseurs et moyens pour sa mise en oeuvre |
FR2362286A1 (fr) * | 1976-08-18 | 1978-03-17 | Mitsui Toatsu Chemicals | Systeme d'etancheite pour une pompe composite a plusieurs etages |
US4170435A (en) * | 1977-10-14 | 1979-10-09 | Swearingen Judson S | Thrust controlled rotary apparatus |
US4493610A (en) * | 1981-10-28 | 1985-01-15 | Hitachi, Ltd. | Axial thrust balancing system |
Non-Patent Citations (1)
Title |
---|
HYDROCARBON PROCESSING, Band 55, Nr. 12, Dezember 1976, Seiten 79-84, Houston, US; E. MAKAY: "How to avoid field problems with ... boiler feed pumps" * |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2687429A1 (fr) * | 1992-02-17 | 1993-08-20 | Alsthom Gec | Procede et dispositif pour supprimer l'instabilite d'une turbine a vapeur. |
DE4313455A1 (de) * | 1993-04-24 | 1994-10-27 | Klein Schanzlin & Becker Ag | Radialer Spalt, beispielsweise einer Strömungsmaschine |
EP0622525A1 (fr) * | 1993-04-24 | 1994-11-02 | KSB Aktiengesellschaft | Eléments de structure avec un interstice radial |
EP1596069A3 (fr) * | 2004-05-10 | 2010-12-29 | Hitachi Industries Co., Ltd. | Pompe centrifuge |
CN102132008B (zh) * | 2008-08-14 | 2014-02-19 | 西门子公司 | 蒸汽涡轮机 |
EP2154332A1 (fr) * | 2008-08-14 | 2010-02-17 | Siemens Aktiengesellschaft | Réduction de la charge thermique d'un boîtier extérieur pour une turbomachine |
WO2010018021A1 (fr) * | 2008-08-14 | 2010-02-18 | Siemens Aktiengesellschaft | Réduction de la charge thermique d’un boîtier extérieur pour une turbomachine |
RU2451920C1 (ru) * | 2010-11-23 | 2012-05-27 | Открытое акционерное общество Научно-производственное объединение "Искра" | Экспериментальная установка для исследования модельных ступеней центробежных компрессоров |
WO2020065674A1 (fr) * | 2018-09-27 | 2020-04-02 | Ksb Tech Pvt. Ltd | Pompe à plusieurs étages, à optimisation de poussée axiale |
CN113227583A (zh) * | 2018-09-27 | 2021-08-06 | Ksb股份有限公司 | 具有轴向推力优化的多级泵 |
US11549512B2 (en) | 2018-09-27 | 2023-01-10 | KSB SE & Co. KGaA | Multistage pump with axial thrust optimization |
CN113227583B (zh) * | 2018-09-27 | 2023-08-08 | Ksb股份有限公司 | 具有轴向推力优化的多级泵 |
EP3896288A1 (fr) * | 2020-04-16 | 2021-10-20 | Sulzer Management AG | Pompe centrifuge pour transporter un fluide |
Also Published As
Publication number | Publication date |
---|---|
FI93259C (fi) | 1995-03-10 |
FI93259B (fi) | 1994-11-30 |
FI864381A (fi) | 1987-05-28 |
US4892459A (en) | 1990-01-09 |
CH669241A5 (de) | 1989-02-28 |
FI864381A0 (fi) | 1986-10-28 |
DE3663165D1 (en) | 1989-06-08 |
EP0224764B1 (fr) | 1989-05-03 |
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