EP0033272B1 - Sicherheitsvorrichtung für Pumpe - Google Patents

Sicherheitsvorrichtung für Pumpe Download PDF

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Publication number
EP0033272B1
EP0033272B1 EP81400088A EP81400088A EP0033272B1 EP 0033272 B1 EP0033272 B1 EP 0033272B1 EP 81400088 A EP81400088 A EP 81400088A EP 81400088 A EP81400088 A EP 81400088A EP 0033272 B1 EP0033272 B1 EP 0033272B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
piston
auxiliary
shaft
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.)
Expired
Application number
EP81400088A
Other languages
English (en)
French (fr)
Other versions
EP0033272A1 (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 the rupture of the dynamic seal separating the high pressure fluid chamber of the pump from the low pressure chamber, according to the preamble of claim 1.
  • 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 possible 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 the primary pumps in service.
  • the device according to the invention is designed to operate only in the event of failure of one of the dynamic seals so as not to be worn when it has to exercise its function.
  • US-A-3,096,985 describes an automatic device intended to drop the fluid pressure and thus limit the leak.
  • This device implements a hollow cylindrical piston whose internal opening which affects a conical shape is provided with a labyrinth seal which can be supported on a complementary conical part of the shaft.
  • Such a device has, on the one hand, the drawback of not ensuring one easy way a total seal and, on the other hand, of being automatic, that is to say of being capable of operating even when the pump shaft is still driven by the motor, which leads to deterioration of the seal before it has played its role.
  • Document AT-B-329 380 also describes a safety device using a hollow cylindrical piston returned to rest by a spring and compressing on an additional pinned ring integral with the shaft an O-ring disposed against a projection of a unexpectedly.
  • Such a device without integrated dynamic seal does not have all the operational safety required in nuclear power plants and cannot be adapted to primary pumps already in service.
  • the present invention allows the realization of a safety device controllable from the outside and ensuring a total seal, in case of failure of a dynamic joint.
  • This device which implements a piston housed in the fixed housing of the dynamic seal separating the high pressure chamber from the low pressure chamber comprises auxiliary means making it possible to move this piston coaxially so as to compress directly between the shaft and the piston a safety O-ring in case of failure of the dynamic seal.
  • the safety device ensuring the longitudinal sealing of the shaft of a pump in the event of a rupture of the dynamic seal separating the high pressure chamber from the low pressure chamber of the fluid in the pump is integral with a sleeve floating.
  • the device comprises a piston placed in the housing of the dynamic seal and auxiliary means constituted by an auxiliary source of pressurized fluid connected to one of the parts of at least one cylinder formed in the housing of the dynamic seal.
  • the device is characterized in that said piston is constituted by said floating bushing and in that said auxiliary means further comprise an auxiliary piston arranged in said cylinder and the rod of which is provided with a stop protruding at its end cooperating with a flange secured to said floating bushing, so that in the event of a rupture of the dynamic seal of the translation movement of said auxiliary piston results in translation movement of said bushing and, consequently, compression of a safety O-ring between said shaft and said bushing.
  • the single figure shows schematically in axial section a device according to an embodiment of the invention ensuring axial sealing.
  • the pump the axis of symmetry of which 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 leakage 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 the shaft (1) is evacuated 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 for that only a film of the fluid escapes from the chamber (4) at high pressure towards the low pressure chamber (5) and ensures the required relative sliding of the parts without overheating.
  • a static O-ring (10) is arranged 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 chamber (5) in the event of a dynamic seal rupture (3), the chamber (5) must withstand the high pressure prevailing in the chamber (4).
  • the safety device essentially comprises a piston (7, 18) constituted by the floating bush (7) and means (15, 19, 20) for axially displacing the bush so that the end (18) of the sleeve (7) compresses the O-ring (14) forming a crown around the shaft (1) of the pump to ensure a seal upstream of the narrowing (11) and, consequently, to prevent the leakage of the fluid under pressure by this narrowing (11), in the reactor enclosure.
  • the preferred means for moving the sleeve (7) consist of an auxiliary source of fluid at a pressure of between 5 and 10 bars, connected to the conduit (15) communicating with one of the parts of a cylindrical chamber (20), and auxiliary pistons (19) arranged in the chamber (20) formed in the housing (2).
  • these auxiliary pistons (19) are three in number and are distributed all around the shaft (1) of the pump, in the cylinders (20) provided for this purpose.
  • each piston (19) is provided, at its end, with a projecting stop (22).
  • the fluid does not escape through the constriction (11), and the floating sleeve (7) can rest on the part (9) of the 'shaft (1) via the dynamic seal (3).
  • the O-ring (14) does not undergo any prior wear and keeps all its effectiveness in case of necessity.
  • the auxiliary source can be disconnected since the pressurized fluid in the chamber (4) then communicating with the chamber (5), tends to push the sleeve (7) further and, therefore, ensures only the required effect.
  • the end 18 of the sleeve 7 can also be covered with a layer of a material reducing friction.

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)

Claims (2)

1. Sicherheitsvorrichtung, welche die Längsabdichtung der Welle (1) einer Pumpe im Falle des Reißens einer dynamischen Dichtung (3) gewährleistet, die mit einer schwimmenden Hülse (7) fest verbunden ist, wobei die dynamische Dichtung (3) die Hochdruckkammer (4) von der Niederdruckkammer (5) für das fluide Medium der Pumpe trennt und wobei die genannte Vorrichtung einen im Aufnahmeraum (2) der dynamischen Dichtung (3) angeordneten zylindrischen Hohlkolben (7, 18), welcher die genannte Welle (1) koaxial umgibt, und Hilfsmittel umfaßt, die durch eine Hilfsquelle für ein unter Druck stehendes fluides Medium gebildet sind, welche an einen der Teile wenigstens eines Zylinders (20) angeschlossen ist, der in dem Aufnahmeraum (2) der genannten dynamischen Dichtung (3) gebildet ist, dadurch gekennzeichnet, daß der genannte Kolben (7, 18) durch die genannte schwimmende Hülse (7) gebildet ist und daß die genannten Hilfsmittel ferner einen Hilfskolben (19) umfassen, welcher in dem genannten Zylinder (20) angeordnet ist und dessen Stange (21) mit einem Anschlag (22) versehen ist, der an ihrem Ende absteht und mit einem Kragen (23) zusammenwirkt, der fest mit der schwimmenden Hülse (7) verbunden ist, dergestalt, daß beim Reißen der dynamischen Dichtung (3) die Translationsbewegung des genannten Hilfskolbens (19) zu einer Translationsbewegung der genannten Hülse (7) und infolgedessen zum Zusammenpressen einer Sicherheitsringdichtung (14) zwischen der genannten Welle (1) und der genannten Hülse (7) führt.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß Mittel vorgesehen sind, um die genannte Hilfsquelle am Ende der Translationsbewegung der genannten Hülse (7) abzutrennen, wobei dann das aus der genannten Hochdruckkammer (4) stammende fluide Medium die erforderliche Wirkung hervorruft.
EP81400088A 1980-01-24 1981-01-22 Sicherheitsvorrichtung für Pumpe Expired EP0033272B1 (de)

Applications Claiming Priority (2)

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

Publications (2)

Publication Number Publication Date
EP0033272A1 EP0033272A1 (de) 1981-08-05
EP0033272B1 true 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) ES8200446A1 (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
WO2007047104A1 (en) * 2005-10-11 2007-04-26 Stein Seal Company Shutdown seal for reactor coolant pump
US7780399B1 (en) 2006-01-12 2010-08-24 Stein Seal Company Reverse pressure double dam face seal
US10436328B2 (en) 2016-06-10 2019-10-08 John Crane Uk Ltd. Dry gas seal with electronically controlled shutdown valve
AU2018270137B2 (en) 2017-05-15 2024-03-28 John Crane Uk Ltd. Dry gas seal with electronically controlled carrier load

Citations (3)

* 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
US4071254A (en) * 1976-10-29 1978-01-31 Westinghouse Electric Corporation Static sealing mechanism for a compressor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717352A (en) * 1969-04-26 1973-02-20 Interatum Int Atomreaktorbau G Seal for rotatable covers of nuclear reactors
AT329380B (de) * 1973-11-02 1976-05-10 Andritz Ag Maschf Dichteinrichtung fur hauptkuhlmittelpumpen
AT352605B (de) * 1975-03-25 1979-09-25 Oesterr Amerikan Magnesit Feuerfeste massen und ungebrannte steine aus magnesia und mischungen von magnesia und chromerz
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 (3)

* 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
US4071254A (en) * 1976-10-29 1978-01-31 Westinghouse Electric Corporation Static sealing mechanism for a compressor

Also Published As

Publication number Publication date
ZA81519B (en) 1982-02-24
FR2474605B1 (de) 1983-03-11
CA1158785A (fr) 1983-12-13
ES498690A0 (es) 1981-11-01
EP0033272A1 (de) 1981-08-05
DE3167244D1 (en) 1985-01-03
ES8200446A1 (es) 1981-11-01
FR2474605A1 (fr) 1981-07-31
JPS57500162A (de) 1982-01-28
US4395048A (en) 1983-07-26
WO1981002184A1 (fr) 1981-08-06

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