EP0033272B1 - Safeguarding device for a pump - Google Patents
Safeguarding device for a pump Download PDFInfo
- 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
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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
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- 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.
Description
La présente invention concerne un dispositif de sécurité assurant l'étanchéité longitudinale de l'arbre d'une pompe en cas de rupture du joint dynamique séparant la chambre à haute pression de fluide de la pompe de la chambre à basse pression, selon le préambule de la revendication 1.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.
Un tel dispositif est notamment prévu pour être adapté aux pompes primaires des réacteurs nucléaires.Such a device is especially intended to be adapted to the primary pumps of nuclear reactors.
En effet, les pompes primaires assurent la circulation du fluide de refroidissement dans le réacteur, fluide qui est généralement contaminé par la radio-activité.In fact, the primary pumps circulate the cooling fluid in the reactor, a fluid which is generally contaminated by radioactivity.
Un jeu de trois joints dynamiques successifs du type à fuite assurent l'étanchéité longitudinale de l'arbre normalement. Toutefois, en cas de défaillance de l'un des joints, les éléments en aval subissent une pression pour laquelle ils n'ont pas été conçus et, après éventuellement rupture des joints situés en aval, le fluide sous pression contaminé vient déborder et emplir l'enceinte elle-même du bâtiment du réacteur.A set of three successive dynamic seals of the leakage type ensure the longitudinal sealing of the shaft normally. However, in the event of a failure of one of the seals, 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.
La présente invention a pour but d'obvier à cet inconvénient au moyen d'un dispositif de sécurité aisément adaptable aux pompes primaires en service.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.
Le dispositif selon l'invention est prévu pour ne fonctionner q'uen cas de défaillance de l'un des joints dynamiques de manière à ne pas être usé lorsqu'il doit exercer sa fonction.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.
On connaît des dispositifs de sécurité selon le préambule de la revendication 1. Par exemple, US-A-3 096 985 décrit un dispositif auto- matjque destiné à faire chuter la pression de fluide et ainsi limiter la fuite. Ce dispositif met en oeuvre un piston cylindrique creux dont l'ouverture interne qui affecte une forme conique est pourvue d'un joint labyrinthe pouvant s'appuyer sur une partie conique complémentaire de l'arbre. Un tel dispositif présente, d'une part, l'inconvénient de ne pas assurer l'une manière facile une etanchéité totale et, d'autre part, d'être automatique, c'est-à-dire d'être susceptible de fonctionner même lorsque l'arbre de la pompe est encore entrainé par le moteur, ce qui entraine une détérioration du joint avant qu ce dernier ait joué son rôle.Safety devices are known according to the preamble of claim 1. For example, 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.
Le document AT-B-329 380 décrit également un dispositif de sécurité mettant en oeuvre un piston cylindrique creux rappelé au repos par un ressort et venant compresser sur un anneau additionnel goupillé solidaire de l'arbre un joint torique disposé contre une saillie d'un encourbellement.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.
Un tel dispositif sans joint dynamique intégré ne présente pas toute la sécurité de fonctionnement requise dans les centrales nucléaires et ne peut pas être adapté aux pompes primaires déjà en service.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.
La présente invention permet la réalisation d'un dispositif de sécurité commandable de l'extérieur et assurant une étanchéité totale, en cas de défaillance d'un joint dynamique.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.
Ce dispositif qui met en oeuvre un piston logé dans le logement fixe du joint dynamique séparant la chambre à haute pression de la chambre à basse pression comprend des moyens auxiliaires permettant de déplacer coaxialement ce piston de manière à comprimer directement entre l'arbre et le piston un joint torique de sécurité en cas de défaillance du joint dynamique.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.
Plus précisément, le dispositif de sécurité assurant l'étanchéité longitudinale de l'arbre d'une pompe en cas de rupture du joint dynamique séparant la chambre à haute pression de la chambre à basse pression du fluide dans la pompe est solidaire d'une douille flottante. Le dispositif comprend un piston placé dans le logement du joint dynamique et des moyens auxiliaires constitués par une source auxiliaire de fluide sous pression connectée à l'une des parties d'au moins un cylindre ménagé dans le logement du joint dynamique. Selon l'invention le dispositif conforme an préambule de la revendication 1 est caractérisé en ce que ledit piston est constitué par ledite douille flottante et en ce que lesdits moyens auxiliaires comprennent en outre un piston auxiliaire disposé dans ledit cylindre et dont la tige est pourvue d'une butée en saillie à son extrémité coopérant avec une collerette solidaire de ladite douille flottante, de telle manière qu'en cas de rupture du joint dynamique du mouvement de translation dudit piston auxiliaire résulte un mouvement de translation de ladite douille et, par suite, la compression d'un joint torique de sécurité entre ledit arbre et ladite douille.More specifically, 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. According to the invention the device according to the preamble of claim 1 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.
L'invention sera mieux comprise et appar- aitrô plus clairement à la lecture de la description qui suit d'un mode préféré de réalisation donné à tire non limitatif, description à laquelle une planche de dessin est annexée.The invention will be better understood and will appear more clearly on reading the following description of a preferred embodiment given without limitation, description to which a drawing board is appended.
La figure unique représente schématiquement en coupe axiale un dispositif conforme à un mode de réalisation de l'invention assurant une etanchéité axiale.The single figure shows schematically in axial section a device according to an embodiment of the invention ensuring axial sealing.
En référence maintenant à cette figure, la pompe dont l'axe de symétrie est représenté en traits mixtes, comprend un arbre (1) en rotation et un logement (2) du joint dynamique (3) fixe en rotation. Le fluide circulant dans la pompe est à haute pression dans la chambre (4) et s'écoule, par la fuite du joint dynamique (3) dans la chambre (5) où règne une pression inférieure à celle de la chambre (4).Referring now to this figure, 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).
Le fluide de fuite est canalisé le long de l'arbre (1) est évacué par le conduit (6) communiquant avec la chambre à basse pression (5).The leakage fluid is channeled along the shaft (1) is evacuated through the conduit (6) communicating with the low pressure chamber (5).
De manière connue, le joint dynamique (3) est solidaire d'une douille flottante (7) mobile en translation et un ressort comprimé (8) maintient le joint (3) en contact étroit avec la partie (9) de l'arbre pour que seul un film du fluide s'échappe de la chambre (4) à haute pression vers la chambre (5) à basse pression et assure le glissement relatif requis des pièces sans échauffement.In known manner, 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.
Un joint torique statique (10) est disposé entre la douille (7) et le logement (2) de manière à éviter toute fuite non fonctionnelle du fluide entre les deux chambres (4 et 5).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).
Dans le dispositif conforme à l'invention, en cas de rupture de joint dynamique (3), la chambre (5) doit supporter la haute pression régnant dans la chambre (4).In the device according to the invention, in the event of a dynamic seal rupture (3), the chamber (5) must withstand the high pressure prevailing in the chamber (4).
Le conduit d'évacuation (6) devient inopérant et le fluide sous pression, s'échappant par le rétrécissement (11) vient inonder l'enceinte du réacteur. Pour obvier à cet inconvénient, le dispositif de sécurité comprend essentiellement un piston (7, 18) constitué par le douille flottante (7) et des moyens (15, 19, 20) pour déplacer axialement la douille de manière à ce que l'extrémité (18) de la douille (7) comprime le joint torique (14) formant couronne autour de l'arbre (1) de la pompe pour assurer une étanchéité en amont du rétrécissement (11) et, par suite, interdire la fuite du fluide sous pression par ce rétrécissement (11), dans l'enceinte du réacteur.The discharge duct (6) becomes inoperative and the pressurized fluid, escaping through the narrowing (11), floods the reactor enclosure. To overcome this drawback, 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.
Les moyens préférés pour déplacer la douille (7) sont constitués par une source auxilaire de fluide sous une pression comprise entre 5 et 10 bars, connectée au conduit (15) communiquant avec l'une des parties d'une chambre cylindrique (20), et des pistons auxiliaires (19) disposés dans la chambre (20) ménagée dans le logement (2).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).
De préférence, ces pistons auxiliaires (19) sont au nombre de trois et sont répartis tout autour de l'arbre (1) de la pompe, dans les cylindres (20) prévus à cet effet.Preferably, 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.
La tige (21) de chaque piston (19) est pourvue, à son extrémité, d'une butée en saillie (22).The rod (21) of each piston (19) is provided, at its end, with a projecting stop (22).
En dehors de toute anomalie de fonctionnement du ou des joints dynamiques (3) de la pompe, le fluide ne s'échappe pas par le rétrécissement (11), et la douille flottante (7) peut reposer sur la partie (9) de l'arbre (1) par l'intermédiaire du joint dynamique (3). Ainsi, le joint torique (14) ne subit aucune usure préalable et garde toute son efficacité en cas de nécessité.Apart from any malfunction of the dynamic seal (s) (3) of the pump, 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). Thus, the O-ring (14) does not undergo any prior wear and keeps all its effectiveness in case of necessity.
Lors d'une défaillance d'un joint dynamique et, plus précisément du joint (3), le fluide déborde par le rétrécissement (11). ).In the event of a failure of a dynamic seal and, more precisely of the seal (3), the fluid overflows through the narrowing (11). ).
Il est alors possible de limiter la fuite en ralentissant d'abord la pompe puis en l'arrêtant après avoir connecté la source auxiliaire de fluide sous pression au conduit (15) les segments (24) d'une part, et les joints toriques (25) d'autre part, assurant l'étanchéité du dispositif. Le piston (19) se meut alors axialement et la butée (22) entre en contact avec une collerette (23) solidaire de la douille (7) qui est, de ce fait, entrainée en translation par le piston (19).It is then possible to limit the leak by first slowing down the pump and then stopping it after having connected the auxiliary source of pressurized fluid to the conduit (15) the segments (24) on the one hand, and the O-rings ( 25) on the other hand, ensuring the tightness of the device. The piston (19) then moves axially and the stop (22) comes into contact with a flange (23) integral with the sleeve (7) which is, therefore, driven in translation by the piston (19).
Lorsque le joint torique (14) est comprimé la source auxiliaire peut être déconnectée puisque le fluide sous pression dans la chambre (4) communiquant alors avec la chambre (5), tend à pousser encore la douille (7) et, par suite, assure seul l'effet requis.When the O-ring (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 sleeve (7) further and, therefore, ensures only the required effect.
Bien évidemment, de manière à permettre le fonctionnement du dispositif à faible vitesse de rotation de l'arbre (1), l'extrémité 18 de la douille 7 peut également être recouverte d'une couche d'un matériau réduisant la friction.Obviously, so as to allow the device to operate at low speed of rotation of the shaft (1), the
Mais une telle couche n'est pas nécessaire si le dispositif de sécurité est prévu pour ne fonctionner qu'après l'arrêt total de l'arbre (1) de la pompe.However, such a layer is not necessary if the safety device is intended to operate only after the pump (1) shaft has completely stopped.
Claims (2)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8001517 | 1980-01-24 | ||
| FR8001517A FR2474605A1 (en) | 1980-01-24 | 1980-01-24 | PUMP SAFETY DEVICE |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0033272A1 EP0033272A1 (en) | 1981-08-05 |
| EP0033272B1 true EP0033272B1 (en) | 1984-11-21 |
Family
ID=9237831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP81400088A Expired EP0033272B1 (en) | 1980-01-24 | 1981-01-22 | Safeguarding device for a pump |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4395048A (en) |
| EP (1) | EP0033272B1 (en) |
| JP (1) | JPS57500162A (en) |
| CA (1) | CA1158785A (en) |
| DE (1) | DE3167244D1 (en) |
| ES (1) | ES498690A0 (en) |
| FR (1) | FR2474605A1 (en) |
| WO (1) | WO1981002184A1 (en) |
| ZA (1) | ZA81519B (en) |
Families Citing this family (8)
| 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 (en) * | 1992-01-24 | 1994-04-29 | Jeumont Schneider | SAFETY DEVICE FOR PRIMARY PUMP. |
| 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 |
| EP3469238B1 (en) | 2016-06-10 | 2022-07-13 | John Crane UK Ltd. | Dry gas seal with electronically controlled shutdown valve |
| JP7093792B2 (en) | 2017-05-15 | 2022-06-30 | ジョン・クレーン・ユーケイ・リミテッド | Dry gas seal with electronically controlled carrier load |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3096985A (en) * | 1961-12-14 | 1963-07-09 | Worthington Corp | Empergency shaft sealing device |
| FR1504545A (en) * | 1966-07-29 | 1967-12-08 | Virax Sa | Improvements to seals for rotating machines, in particular for centrifugal pumps |
| US4071254A (en) * | 1976-10-29 | 1978-01-31 | Westinghouse Electric Corporation | Static sealing mechanism for a compressor |
Family Cites Families (6)
| 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 (en) * | 1973-11-02 | 1976-05-10 | Andritz Ag Maschf | SEALING DEVICE FOR MAIN COOLANT PUMPS |
| AT352605B (en) * | 1975-03-25 | 1979-09-25 | Oesterr Amerikan Magnesit | Refractory masses and unfired stones made from magnesia and mixtures of magnesia and chrome |
| SE414219B (en) * | 1977-12-23 | 1980-07-14 | Derman Ab K G | DEVICE FOR SEALING AN ANIMAL OPENING BETWEEN AN INTERNAL PART PREFERRED BY AN AXLE AND THIS SURROUNDING OUTER PART |
| 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 |
-
1980
- 1980-01-24 FR FR8001517A patent/FR2474605A1/en active Granted
-
1981
- 1981-01-21 ES ES498690A patent/ES498690A0/en active Granted
- 1981-01-22 JP JP56500455A patent/JPS57500162A/ja active Pending
- 1981-01-22 WO PCT/FR1981/000006 patent/WO1981002184A1/en unknown
- 1981-01-22 EP EP81400088A patent/EP0033272B1/en not_active Expired
- 1981-01-22 DE DE8181400088T patent/DE3167244D1/en not_active Expired
- 1981-01-22 US US06/306,615 patent/US4395048A/en not_active Expired - Lifetime
- 1981-01-23 CA CA000369209A patent/CA1158785A/en not_active Expired
- 1981-01-26 ZA ZA00810519A patent/ZA81519B/en unknown
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3096985A (en) * | 1961-12-14 | 1963-07-09 | Worthington Corp | Empergency shaft sealing device |
| FR1504545A (en) * | 1966-07-29 | 1967-12-08 | Virax Sa | Improvements to seals for rotating machines, in particular for centrifugal pumps |
| US4071254A (en) * | 1976-10-29 | 1978-01-31 | Westinghouse Electric Corporation | Static sealing mechanism for a compressor |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57500162A (en) | 1982-01-28 |
| ES8200446A1 (en) | 1981-11-01 |
| ZA81519B (en) | 1982-02-24 |
| EP0033272A1 (en) | 1981-08-05 |
| ES498690A0 (en) | 1981-11-01 |
| DE3167244D1 (en) | 1985-01-03 |
| FR2474605B1 (en) | 1983-03-11 |
| US4395048A (en) | 1983-07-26 |
| FR2474605A1 (en) | 1981-07-31 |
| CA1158785A (en) | 1983-12-13 |
| WO1981002184A1 (en) | 1981-08-06 |
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