US3918272A - Centrifugal pump assembly for use in nuclear reactor plants or the like - Google Patents

Centrifugal pump assembly for use in nuclear reactor plants or the like Download PDF

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Publication number
US3918272A
US3918272A US426629A US42662973A US3918272A US 3918272 A US3918272 A US 3918272A US 426629 A US426629 A US 426629A US 42662973 A US42662973 A US 42662973A US 3918272 A US3918272 A US 3918272A
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US
United States
Prior art keywords
coupling
shaft
intermediate shaft
combination
section
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.)
Expired - Lifetime
Application number
US426629A
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English (en)
Inventor
Ernst Honold
Michael Rupp
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.)
Klein Schanzlin and Becker AG
Original Assignee
Klein Schanzlin Becker Aktieng
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
Priority claimed from DE19722261643 external-priority patent/DE2261643C3/de
Application filed by Klein Schanzlin Becker Aktieng filed Critical Klein Schanzlin Becker Aktieng
Application granted granted Critical
Publication of US3918272A publication Critical patent/US3918272A/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
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • 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
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T403/00—Joints and connections
    • Y10T403/50—Bridged by diverse connector

Definitions

  • ABSTRACT IN NUCLEAR REACTOR PLANTS OR THE A vertical centrifugal pump assembly for use as a pri- LIKE mary recirculating pump in a nuclear reactor plant has [75] Inventors: Ernst Honold; Michael Riipp, both an uppermost which dnYen by a motor a of Frankenthal Germany ermost shaft WhlCh drives the impeller of the pump, t j and an intermediate shaft which is movable axially be- Asslgneel in, Schan ln Becker tween the uppermost and lowermost shafts and carries Aktlellgesellschaft,Ffaflkenthal, a housing for radial and/or thrust bearings.
  • a rigid Germany coupling between the lowermost shaft and the inter- [22] Filed; 12, 1973 mediate shaft is disengaged when the intermediate shaft is lifted to thereby afford access to certain parts PP 426,629 of the lowermost shaft.
  • the uppermost shaft can drive the intermediate shaft through the medium of a flexi- [30] Foreign Application priority Data ble coupling having coupling elements mounted on the D l 6 1972 G 2261643 lower end of the uppermost shaft and the upper end of the intermediate shaft, and a distancing sleeve whose internal threads are in permanent mesh with external [52] Cl threads of the two coupling elements.
  • a shroud which [51] Int Cl 1516!
  • the minimum-diameter section When the minimum-diameter section is UNITED STATES PATENTS detached from the casing of the motor, it can be slid, 521,677 6/1884 Smith 64/1 C together with the intermediate section, into the max- 2,830,801 4/1 58 Stratico o et 403/286 imum-diameter section to thereby afford access to the 2,959,943 11/1960 Allen 69/9 fl ibl coupling
  • the rigid coupling has two coaxial 3 32; E
  • the present invention relates to improvements in centrifugal pump assemblies in general, and more particularly to improvements in upright pump assemblies of the type which may constitute the primary recirculating pumps for use in nuclear reactor plants, for example, in pressurized water reactors.
  • a primary recirculating pump with three coaxial shafts including a lower shaft or pump shaft, an intermediate shaft for the necessary radial and/or thrust bearings, and an upper shaft or motor shaft which is driven by the prime mover.
  • the torque-transmitting connection between the pump shaft and the intermediate shaft constitutes a rigid coupling
  • the torque-transmitting connection between the intermediate shaft and the motor shaft constitutes a flexible coupling.
  • the second unit including the bearing housing, the thrust bearing and the upper radial bearing is installed in a supporting bellows and is connected with the prime mover by the aforementioned flexible coupling.
  • the coupling between the first unit and the second unit is rigid.
  • a relatively long removable liner or envelope is provided to allow for rapid installation or removal of the antifriction bearing for the pump shaft and/or shaft seal without interrrupting the connection between the bearing housing and the prime mover.
  • the just mentioned liner contributes to the overall length of the assembly including the three shafts.
  • the upper and lower ends of the removable liner must be installed in the aggregate by resorting to two discrete auxiliary couplings which contribute to the initial and maintenance cost and whose engagement or disengagement takes up substantial amounts of time.
  • An object of the invention is to provide a novel and improved vertical pump assembly which is'more rigid, shorter and less complex than heretofore known pump assemblies, and wherein the parts which require frequent inspection, repair and/or replacement can be reached with little loss in time.
  • Another object of the invention is to provide a pump assembly which can dispense with the aforediscussed liner and auxiliary couplings and wherein the intermediate shaft is connected with the output shaft of the prime mover in a novel and improved way.
  • a further object of the invention is to provide an improved primary recirculating pump assembly for use in nuclear reactor plants.
  • An additional object of the invention is to provide a novel shroud between the prime mover and the intermediate shaft of the improved pump assembly.
  • the invention is embodied in a centrifugal pump assembly, particularly in a primary recirculating pump for use in nuclear reactor plants.
  • the pump assembly comprises an upright motor shaft, a pump shaft which is coaxial with and is spaced apart from the motor shaft,
  • a bearings-carrying intermediate shaft which is coaxial with, disposed between and movable axially relative to the other two shafts between an operative position in which it can drive the pump shaft and an inoperative position, a first coupling (preferably a flexible coupling) which is provided between the motor shaft and the intermediate shaft, and a second coupling (preferably a rigid coupling) which is provided between the intermediate shaft and the pump shaft.
  • One of the cou plings (preferably the second coupling) is disengaged in automatic response to movement of the intermediate shaft from its operative position.
  • the motor shaft is normally disposed above the intermediate shaft.
  • the flexible coupling preferably includes a first externally toothed coupling element rigid with the motor shaft, a second externally toothed coupling element rigid with the intermediate shaft, and a distancing sleeve preferably having two discrete sets of internal teeth in permanent mesh with the external teeth of the two coupling elements.
  • the flexible coupling is normally surrounded by a variable-length shroud which has a maximum-diameter tubular section secured to the housing for bearings on the intermediate shaft, a minimum-diameter section separably secured to the casing of the prime mover which drives the motor shaft, and a median section which is telescoped into the maximum-diameter section and telescopically receives the minimum-diameter section.
  • a variable-length shroud which has a maximum-diameter tubular section secured to the housing for bearings on the intermediate shaft, a minimum-diameter section separably secured to the casing of the prime mover which drives the motor shaft, and a median section which is telescoped into the maximum-diameter section and telescopically receives the minimum-diameter section.
  • the coupling between the pump shaft and the intermediate shaft may include two coaxial coupling elements having radially extending complementary teeth which mate in the operative position of the intermediate shaft.
  • FIG. 1 is a fragmentary axial sectional view of a pump assembly which embodies one form of the invention, the intermediate shaft being shown in its operative position;
  • FIG. 2 illustrates the structure of FIG. 1 but with the intermediate shaft in raised or inoperative position
  • FIG. 3 is a partly elevational and partly axial sectional view of a modified rigid coupling between the pump shaft and the intermediate shaft.
  • FIG. 1 shows the novel parts of the pump assembly in 4 mover.
  • the shroud is then collapsed by respectively pushing its sections 5, 5 downwardly into the sections 5, 5" so that the overall axial length of the shroud is reduced to equal or closely approximate the axial ln pump assemblies to which the present invention pertains, it is normally desirable to leave the prime mover in fully assembled condition when the parts which are mounted on the shaft la and/or 2 require attention.
  • the torque-transmitting connection between the prime mover and the pump should be as short as possible without, however, preventing access to parts on the shaft la and/or 2.
  • Such parts include primarily the shaft seals, the bearing or bearings for the pump shaft, and the axial and/or radial bearings (in the housing 1) for the output shaft 8a of the prime mover. All this is achieved by the aforedescribed construction of the improved pump assembly with the additional advantage that the distance between the bearings for the shafts 8a, 2 is less than in conventional pump assemblies which contributes to rigidity and longer useful life of the apparatus.
  • a combination comprising an upright motor shaft; a pump shaft coaxial with and spaced apart from said motor shaft; a bearings-carrying intermediate shaft coaxial with, disposed between-and movable axially relative to said first mentioned shafts between an operative position and an inoperative position; a first coupling provided between said motor shaft and said intermediate shaft; a variable-length shroud normally surrounding said first coupling; and a second coupling provided between said pump shaft and said intermediate shaft, one of said couplings being respectively engaged and disengaged in said operative and inoperative positions of said intermediate shaft.
  • said second coupling comprises a first coupling element rigid with said pump shaft and a second coupling element rigid with said intermediate shaft and engaging 6 said first coupling element only in said operative position of said intermediate shaft.
  • said first coupling is a flexible coupling and includes a sleeve-like first coupling element receiving torque from said motor shaft, a second coupling element provided on and movable axially with said intermediate shaft, and means for maintaining said second coupling element in torque-receiving engagement with said first coupling element in all axial positions of said intermediate shaft.
  • said shroud comprises a plurality of telescopically connected tubular sections including a first section mov-' able with said intermediate shaft, a second section normally connected with said motor shaft and a median section.
  • said first coupling is a flexible coupling and comprises a first coupling element rigid with said motor shaft, a second coupling element rigid with said intermediate shaft, and a distancing sleeve arranged to transmit torque from said first to said second coupling element.
  • first and second coupling elements have external teeth and said sleeve has internal teeth mating with said external teeth of said coupling elements in each axial position.of said intermediate shaft.
  • said internal teeth include discrete first and second sets of teeth which respectively mate with the external teeth of said first and second coupling elements.
  • said one coupling is said second coupling and said second coupling comprises coaxial first and second coupling elements respectively rigid with said pump shaft and said intermediate shaft, said coupling elements having complementary teeth which mate in said operative position of said intermediate shaft.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)
US426629A 1972-12-16 1973-12-12 Centrifugal pump assembly for use in nuclear reactor plants or the like Expired - Lifetime US3918272A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19722261643 DE2261643C3 (de) 1972-12-16 Kreiselpumpe vertikaler Bauart

Publications (1)

Publication Number Publication Date
US3918272A true US3918272A (en) 1975-11-11

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Family Applications (1)

Application Number Title Priority Date Filing Date
US426629A Expired - Lifetime US3918272A (en) 1972-12-16 1973-12-12 Centrifugal pump assembly for use in nuclear reactor plants or the like

Country Status (4)

Country Link
US (1) US3918272A (enrdf_load_stackoverflow)
JP (1) JPS5755915B2 (enrdf_load_stackoverflow)
AT (1) AT325953B (enrdf_load_stackoverflow)
GB (1) GB1448097A (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4120175A (en) * 1975-09-25 1978-10-17 Klein, Schanzlin & Becker Aktiengesellschaft Flexible shaft coupling
US4389368A (en) * 1980-08-15 1983-06-21 Duncan Richard J Failsafe coolant pump for nuclear reactor
US4913563A (en) * 1988-11-07 1990-04-03 Westinghouse Electric Corp. Hydrodynamic pivoted pad bearing assembly for a reactor coolant pump
EP0403049A3 (en) * 1989-06-12 1991-07-31 Westinghouse Electric Corporation An assembly for facilitating inservice inspection of a reactor coolant pump rotor
RU2238440C1 (ru) * 2003-05-05 2004-10-20 Открытое акционерное общество "Татнефть" им. В.Д. Шашина Привод вертикального скважинного центробежного насоса
US20080019831A1 (en) * 2004-07-16 2008-01-24 Kenichi Kajiwara Centrifugal Pump
US20100234850A1 (en) * 2005-02-01 2010-09-16 Smith And Nephew, Inc. Lockable Orientation Instrument Assembly
US20100284830A1 (en) * 2009-05-05 2010-11-11 National Oilwell Varco, L.P. Surface Pump Assembly Having a Thrust Chamber with a Telescoping Shaft

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US521677A (en) * 1894-06-19 Island
US2830801A (en) * 1956-12-28 1958-04-15 Philadelphia Gear Works Inc Seal-bearing agitator drives
US2959943A (en) * 1958-09-11 1960-11-15 Zurn Ind Inc Coupling for driving a machine
US3282614A (en) * 1963-10-10 1966-11-01 Patterson Ind Inc Coupling device
US3306076A (en) * 1964-09-15 1967-02-28 Saginaw Machine And Tool Compa Axially adjustable coupling
US3487432A (en) * 1967-03-09 1969-12-30 Grundfos As Coupling element for connection between a centrifugal pump and its drive motor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US521677A (en) * 1894-06-19 Island
US2830801A (en) * 1956-12-28 1958-04-15 Philadelphia Gear Works Inc Seal-bearing agitator drives
US2959943A (en) * 1958-09-11 1960-11-15 Zurn Ind Inc Coupling for driving a machine
US3282614A (en) * 1963-10-10 1966-11-01 Patterson Ind Inc Coupling device
US3306076A (en) * 1964-09-15 1967-02-28 Saginaw Machine And Tool Compa Axially adjustable coupling
US3487432A (en) * 1967-03-09 1969-12-30 Grundfos As Coupling element for connection between a centrifugal pump and its drive motor

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4120175A (en) * 1975-09-25 1978-10-17 Klein, Schanzlin & Becker Aktiengesellschaft Flexible shaft coupling
US4389368A (en) * 1980-08-15 1983-06-21 Duncan Richard J Failsafe coolant pump for nuclear reactor
US4913563A (en) * 1988-11-07 1990-04-03 Westinghouse Electric Corp. Hydrodynamic pivoted pad bearing assembly for a reactor coolant pump
EP0403049A3 (en) * 1989-06-12 1991-07-31 Westinghouse Electric Corporation An assembly for facilitating inservice inspection of a reactor coolant pump rotor
RU2238440C1 (ru) * 2003-05-05 2004-10-20 Открытое акционерное общество "Татнефть" им. В.Д. Шашина Привод вертикального скважинного центробежного насоса
US20080019831A1 (en) * 2004-07-16 2008-01-24 Kenichi Kajiwara Centrifugal Pump
US20100234850A1 (en) * 2005-02-01 2010-09-16 Smith And Nephew, Inc. Lockable Orientation Instrument Assembly
US20100284830A1 (en) * 2009-05-05 2010-11-11 National Oilwell Varco, L.P. Surface Pump Assembly Having a Thrust Chamber with a Telescoping Shaft
US8529222B2 (en) * 2009-05-05 2013-09-10 National Oilwell Varco, L.P. Surface pump assembly having a thrust chamber with a telescoping shaft

Also Published As

Publication number Publication date
JPS4989204A (enrdf_load_stackoverflow) 1974-08-26
AT325953B (de) 1975-11-25
JPS5755915B2 (enrdf_load_stackoverflow) 1982-11-26
ATA1047873A (de) 1975-01-15
GB1448097A (en) 1976-09-02
DE2261643A1 (de) 1974-06-27
DE2261643B2 (de) 1976-11-18

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