EP0033272A1 - Sicherheitsvorrichtung für Pumpe - Google Patents

Sicherheitsvorrichtung für Pumpe Download PDF

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Publication number
EP0033272A1
EP0033272A1 EP81400088A EP81400088A EP0033272A1 EP 0033272 A1 EP0033272 A1 EP 0033272A1 EP 81400088 A EP81400088 A EP 81400088A EP 81400088 A EP81400088 A EP 81400088A EP 0033272 A1 EP0033272 A1 EP 0033272A1
Authority
EP
European Patent Office
Prior art keywords
piston
shaft
seal
chamber
pump
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
Application number
EP81400088A
Other languages
English (en)
French (fr)
Other versions
EP0033272B1 (de
Inventor
Francis Timmermans
Jean Vandervorst
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.)
Jeumont Schneider SA
Original Assignee
Jeumont Schneider SA
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 Jeumont Schneider SA filed Critical Jeumont Schneider SA
Publication of EP0033272A1 publication Critical patent/EP0033272A1/de
Application granted granted Critical
Publication of EP0033272B1 publication Critical patent/EP0033272B1/de
Expired 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/10—Shaft sealings
    • F04D29/14—Shaft sealings operative only when pump is inoperative
    • F04D29/146—Shaft sealings operative only when pump is inoperative especially adapted for liquid pumps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/914—Backup seal for failure of primary seal
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S277/00—Seal for a joint or juncture
    • Y10S277/929—Seal feature where change in operation or condition induces additional leakage control

Definitions

  • the present invention relates to a safety device ensuring the longitudinal sealing of the shaft of a pump in the event of rupture of the dynamic seal separating the high pressure fluid chamber of the pump from the low pressure chamber.
  • Such a device is especially intended to be adapted to the primary pumps of nuclear reactors.
  • the primary pumps circulate the cooling fluid in the reactor, a fluid which is generally contaminated by radioactivity.
  • a set of three successive dynamic seals of the leakage type ensure the longitudinal sealing of the shaft normally.
  • the downstream elements undergo a pressure for which they were not designed and, after possibly rupture of the seals located downstream, the contaminated pressurized fluid overflows and fills the the enclosure itself of the reactor building.
  • the object of the present invention is to obviate this drawback by means of a safety device easily. adaptable to primary pumps in service.
  • the device according to the invention is intended to operate only in the event of failure of one of the seals so as not to be worn when it has to exercise its function.
  • this device comprises a hollow cylindrical piston coaxially surrounding the pump shaft and normally housed in a chamber provided for this purpose in the fixed housing of the dynamic seal separating the high pressure chamber from the low pressure chamber, and means making it possible to coaxially move this piston so as to compress between the shaft and the piston a safety O-ring in the event of failure of the dynamic seal.
  • Figure 1 shows schematically in axial section a device according to a first embodiment of the invention ensuring a radial seal
  • Figure 2 shows schematically in axial section a device according to a second embodiment of the invention ensuring an axial seal.
  • the pump whose axis of symmetry is shown in phantom, comprises a shaft 1 in rotation and a housing 2 of the dynamic seal 3 fixed in rotation.
  • the fluid circulating in the pump is at high pressure in the chamber 4 and flows, through the fluid of the dynamic seal 3 into the chamber 5 where there is a pressure lower than that of the chamber 4.
  • the leakage fluid is channeled along from the shaft 1 and is discharged through the conduit 6 communicating with the low pressure chamber 5.
  • the dynamic seal 3 is integral with a floating sleeve 7 movable in translation and a compressed spring 8 keeps the seal 3 in close contact with the part 9 of the shaft so that only a film of the fluid escapes from chamber 4 at high pressure to chamber 5 at low pressure and ensures the required relative sliding of the parts without heating.
  • a static O-ring 10 is disposed between the sleeve 7 and the housing 2 so as to prevent any non-functional leakage of the fluid between the two chambers 4 and 5.
  • the safety device which is added essentially comprises a piston 12 and means for axially moving this piston so as to apply it against the crown 13 provided for this purpose on the shaft 1 and thus compress a seal. toric 14 to reduce and suppress the escape of fluid in the reactor enclosure.
  • the preferred means for moving this piston 12 consist of an auxiliary source of pressurized fluid, for example compressed air at a pressure of between 5 and 10 bars, connected to the conduit 15 communicating with a chamber 16.
  • a static O-ring 17 prevents any mixture of different fluids under pressure.
  • the fluid does not escape through the constriction 11, and the piston 12 can rest in the chamber 13 provided for this purpose in the housing 2.
  • the seal toric 14 does not undergo any prior wear and retains its effectiveness when necessary.
  • FIG. 2 A second embodiment of a device according to the invention is shown diagrammatically in FIG. 2 for a pump of greater power.
  • elements similar to those of Figure 1 have the same references.
  • the sleeve 7 itself constitutes the piston in the event of failure of the seal 3.
  • the O-ring 14 forming a crown around the pump shaft is compressed by the end 18 of the sleeve 7 so as to ensure a seal upstream of the constriction 11 and, consequently, to prevent the leakage of the pressurized fluid by this constriction 11.
  • auxiliary pistons 19 are, for example arranged in the housing 2.
  • these auxiliary pistons are three in number and are distributed all around the shaft 1 of the pump, in cylinders 20 provided for this purpose.
  • each piston 19 is provided, at its end, with a projecting stop 22.
  • an auxiliary source of pressurized fluid is connected to the conduit 15 communicating with one of the parts of the cylinder 20.
  • the segments 24 on the one hand, and the O-rings 25 on the other hand, ensure the sealing of the device.
  • the auxiliary source when the seal 14 is compressed the auxiliary source can be disconnected since the pressurized fluid in the chamber 4 then communicating with the chamber 5, tends to push the bush 7 further and, consequently, ensures only the effect required.
  • the end 18 of the sleeve 7 can also be covered with a layer of a material reducing friction.
  • the means for ensuring the displacement of the piston can also be of the electrical type, an electrical coil then being appropriately disposed in the housing 2 and being connected to an external electrical voltage source.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP81400088A 1980-01-24 1981-01-22 Sicherheitsvorrichtung für Pumpe Expired EP0033272B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8001517A FR2474605A1 (fr) 1980-01-24 1980-01-24 Dispositif de securite pour pompe
FR8001517 1980-01-24

Publications (2)

Publication Number Publication Date
EP0033272A1 true EP0033272A1 (de) 1981-08-05
EP0033272B1 EP0033272B1 (de) 1984-11-21

Family

ID=9237831

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81400088A Expired EP0033272B1 (de) 1980-01-24 1981-01-22 Sicherheitsvorrichtung für Pumpe

Country Status (9)

Country Link
US (1) US4395048A (de)
EP (1) EP0033272B1 (de)
JP (1) JPS57500162A (de)
CA (1) CA1158785A (de)
DE (1) DE3167244D1 (de)
ES (1) ES498690A0 (de)
FR (1) FR2474605A1 (de)
WO (1) WO1981002184A1 (de)
ZA (1) ZA81519B (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4746268A (en) * 1987-07-29 1988-05-24 Hitachi, Ltd. End face mechanical shaft seal for use in hydraulic machines and seal ring assembly for use in the shaft seal
FR2686658B1 (fr) * 1992-01-24 1994-04-29 Jeumont Schneider Dispositif de securite pour pompe primaire.
GB0202468D0 (en) * 2002-02-02 2002-03-20 Crane John Uk Ltd Seals
US20070235946A9 (en) * 2004-05-28 2007-10-11 Garrison Glenn M Air riding seal
US20070140877A1 (en) * 2005-10-11 2007-06-21 Sanville Mark E Shutdown seal for reactor coolant pump
US7780399B1 (en) 2006-01-12 2010-08-24 Stein Seal Company Reverse pressure double dam face seal
MX2018015325A (es) 2016-06-10 2019-08-14 Crane John Uk Ltd Sello de gas seco con valvula de cierre electronicamente controlada.
US10677357B2 (en) 2017-05-15 2020-06-09 John Crane Uk Ltd. Dry gas seal with electronically controlled carrier load

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT329380B (de) * 1973-11-02 1976-05-10 Andritz Ag Maschf Dichteinrichtung fur hauptkuhlmittelpumpen

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3096985A (en) * 1961-12-14 1963-07-09 Worthington Corp Empergency shaft sealing device
FR1504545A (fr) * 1966-07-29 1967-12-08 Virax Sa Perfectionnements aux joints d'étanchéité pour machines tournantes, en particulier pour pompes centrifuges
US3717352A (en) * 1969-04-26 1973-02-20 Interatum Int Atomreaktorbau G Seal for rotatable covers of nuclear reactors
AT352605B (de) * 1975-03-25 1979-09-25 Oesterr Amerikan Magnesit Feuerfeste massen und ungebrannte steine aus magnesia und mischungen von magnesia und chromerz
US4071254A (en) * 1976-10-29 1978-01-31 Westinghouse Electric Corporation Static sealing mechanism for a compressor
SE414219B (sv) * 1977-12-23 1980-07-14 Derman Ab K G Anordning for avtetning av en ringformig oppning mellan en inre del som foretredesvis utgores av en axel och en denna omgivande yttre del
US4212475A (en) * 1979-01-15 1980-07-15 Crane Packing Co. Self aligning spiral groove face seal
US4174843A (en) * 1978-06-08 1979-11-20 The United States Of America As Represented By The Secretary Of The Navy Self-adjusting tandem seal

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT329380B (de) * 1973-11-02 1976-05-10 Andritz Ag Maschf Dichteinrichtung fur hauptkuhlmittelpumpen

Also Published As

Publication number Publication date
WO1981002184A1 (fr) 1981-08-06
JPS57500162A (de) 1982-01-28
EP0033272B1 (de) 1984-11-21
ZA81519B (en) 1982-02-24
FR2474605A1 (fr) 1981-07-31
US4395048A (en) 1983-07-26
DE3167244D1 (en) 1985-01-03
FR2474605B1 (de) 1983-03-11
ES8200446A1 (es) 1981-11-01
CA1158785A (fr) 1983-12-13
ES498690A0 (es) 1981-11-01

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