WO1990010166A1 - Joint d'etancheite pour arbre - Google Patents

Joint d'etancheite pour arbre Download PDF

Info

Publication number
WO1990010166A1
WO1990010166A1 PCT/GB1990/000325 GB9000325W WO9010166A1 WO 1990010166 A1 WO1990010166 A1 WO 1990010166A1 GB 9000325 W GB9000325 W GB 9000325W WO 9010166 A1 WO9010166 A1 WO 9010166A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaft
pressure
enclosure
seal
sealing
Prior art date
Application number
PCT/GB1990/000325
Other languages
English (en)
Inventor
Lawrence William Gatehouse
John David Hooley
Original Assignee
Baker Hughes Limited
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 Baker Hughes Limited filed Critical Baker Hughes Limited
Publication of WO1990010166A1 publication Critical patent/WO1990010166A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/40—Sealings between relatively-moving surfaces by means of fluid
    • F16J15/42—Sealings between relatively-moving surfaces by means of fluid kept in sealing position by centrifugal force
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/002—Sealings comprising at least two sealings in succession
    • F16J15/008—Sealings comprising at least two sealings in succession with provision to put out of action at least one sealing; One sealing sealing only on standstill; Emergency or servicing sealings

Definitions

  • the present invention relates to a seal for a shaft of the type that projects through a bearing into an enclosure such as a reaction vessel.
  • the seal is to prevent vapour from the enclosure reaching the atmosphere.
  • labyrinth seal such as a helical grooved windback seal around the shaft.
  • This seal provides a barrier to the vapour from the enclosure to the atmosphere so that diffusion of the vapour into the atmosphere is prevented.
  • a windback seal will prevent that escape while the shaft is rotating.
  • a sealing assembly for a rotatable shaft which passes into an enclosure.
  • a two part seal is provided which seals the enclosure at least under certain conditions.
  • the two part seal comprises a first non-rotating part which surrounds the shaft, which is axially movable under the influence of pressure and which has a first sealing face thereon, and a second part which rotates with the shaft and has a second sealing face which when contacting the first, substantially seals a potential leakage path between the first part and the shaft.
  • the axial movement of the first part of the seal depends on the pressure difference between a liquid in a chamber and the contents of the enclosure, so that an overpressure in the enclosure forces the sealing faces together.
  • the chamber is defined by an impeller mounted on the shaft and a stationary stator, the impeller and stator cooperating to form means for raising the pressure of the liquid in the chamber with respect to the enclosure under a first predetermined condition, e.g. when the shaft rotates, so that the movement of the first part is controlled by a pressure sensitive member, e.g. a diaphragm, which is responsive to the pressure of the liquid in the chamber.
  • the first part of the seal may be a cylindrical member around the centre of the diaphragm which is a wall between the enclosure and the chamber and whose central part moves axially in response to the pressure difference between the chamber and the enclosure.
  • the first sealing face may be the end edges of the cylinder.
  • the second sealing face is preferably and conveniently on the same member which forms the impeller.
  • An additional seal e.g. a labyrinth seal, is preferably provided for sealing the enclosure from the shaft when there is a clearance between the sealing faces.
  • This additional seal may be a helical groove windback seal. The function of this seal will be assisted by the overpressure of the liquid in the chamber during rotation.
  • This shaft is preferably a vertical shaft and may be a driving or driven shaft of any vertical machine, such as a pump, agitator, autoclave or similar.
  • Figure 1 shows a vertical rotatable shaft 1, a bearing assembly 2 for the shaft 1 below which is a volume
  • the shaft 1 enters an enclosure 4 e.g. a reactor vessel, the contents of which give off vapour.
  • a liquid reservoir 5 is annular, surrounds the shaft 1 and is partially filled with liquid. This may be an oil having lubricant properties.
  • a helical grooved windback labyrinth seal " 7 is provided on a sleeve 6 surrounding the shaft 1, the labyrinth seal being close fitting to the shaft 1.
  • the labyrinth seal 7 helps to seal the volume 3, particularly during rotation of the shaft.
  • a flexible diaphragm 8 which surrounds the shaft.
  • the central part of the diaphragm 8 adjacent the shaft is formed into an axially movable cylinder 9 whose further end face from the diaphragm is a first sealing face 10.
  • a member 11 is attached to the shaft 1, part of which has a second sealing face 12 which can contact the first sealing face 10 so as to seal the potential leakage path between the cylinder 9 and the shaft 1.
  • Another part of the member 11 is an impeller 13 which, with a stationary stator member 14, defines a chamber 15 between the reservoir 5 and the sealing faces 10,12. On rotation of the impeller 13 with the shaft 1, the impeller 13 cooperates with the stator member 14 and liquid in the reservoir 5 is driven into the chamber 15, so raising the pressure of liquid therein.
  • the function of the seal thus described is as follows: when the shaft 1 is stationary, there is an overpressure in the enclosure 4 as compared with the reservoir 5 and chamber 15. The diaphragm flexes towards the chamber 15 and the cylinder 9 is pushed towards the member 11. The first sealing face 10 contacts the second sealing face 12 so as to seal the chamber 15 and reservoir 5 from the enclosure 4. The greater the overpressure in the enclosure 4, the harder the sealing faces are forced together.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

Un joint d'étanchéité pour un arbre rotatif (1) saillant dans une enceinte (4) comprend entre autre une première partie (9) non rotative, mobile axialement, entourant l'arbre (1) et présentant une première face d'étanchéité (10), ainsi qu'une seconde partie (11) tournant avec l'arbre (1) et présentant une seconde face d'étanchéité (10), ainsi qu'une seconde partie (11) tournant avec l'arbre (1) et présentant une seconde face d'étanchéité (12). Lorsque l'arbre est stationnaire l'excédent de pression se trouvant dans l'enceinte (4) provoque le mouvement axial de la première partie (9), afin de produire un joint d'étanchéité entre les faces (10, 12), empêchant ainsi les fuites de vapeur à partir de l'enceinte (4). Lorsque l'arbre tourne une roue d'hélice (13) coopérant avec un stator stationnaire (14) fait monter la pression du liquide se trouvant dans une chambre (15), par rapport à celle régnant dans l'enceinte, ce qui provoque la flexion d'un diaphragme (8) et la rupture du joint d'étanchéité entre les faces (10, 12) empêchant ainsi l'usure des faces d'étanchéité (10, 12) tout en empêchant encore les fuites de vapeur.
PCT/GB1990/000325 1989-03-02 1990-03-02 Joint d'etancheite pour arbre WO1990010166A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8904796.3 1989-03-02
GB8904796 1989-03-02

Publications (1)

Publication Number Publication Date
WO1990010166A1 true WO1990010166A1 (fr) 1990-09-07

Family

ID=10652606

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1990/000325 WO1990010166A1 (fr) 1989-03-02 1990-03-02 Joint d'etancheite pour arbre

Country Status (2)

Country Link
AU (1) AU5192090A (fr)
WO (1) WO1990010166A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0561014A1 (fr) * 1992-03-16 1993-09-22 BECKER VERFAHRENSTECHNIK, DIPL. ING. ERNST BECKER GmbH & CO KG Joint dynamique d'étanchéité sans contact

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2646999A (en) * 1948-01-23 1953-07-28 Filton Ltd Fluid seal
US2738208A (en) * 1952-03-17 1956-03-13 Francis A Utecht Jr Seal
FR2234496A1 (fr) * 1973-06-22 1975-01-17 Burgmann Dichtungswerk Feodor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2646999A (en) * 1948-01-23 1953-07-28 Filton Ltd Fluid seal
US2738208A (en) * 1952-03-17 1956-03-13 Francis A Utecht Jr Seal
FR2234496A1 (fr) * 1973-06-22 1975-01-17 Burgmann Dichtungswerk Feodor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0561014A1 (fr) * 1992-03-16 1993-09-22 BECKER VERFAHRENSTECHNIK, DIPL. ING. ERNST BECKER GmbH & CO KG Joint dynamique d'étanchéité sans contact

Also Published As

Publication number Publication date
AU5192090A (en) 1990-09-26

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