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WO1992012366A1 - Ensemble d'etanchement biphase - Google Patents

Ensemble d'etanchement biphase Download PDF

Info

Publication number
WO1992012366A1
WO1992012366A1 PCT/US1992/000147 US9200147W WO9212366A1 WO 1992012366 A1 WO1992012366 A1 WO 1992012366A1 US 9200147 W US9200147 W US 9200147W WO 9212366 A1 WO9212366 A1 WO 9212366A1
Authority
WO
WIPO (PCT)
Prior art keywords
seal
fluid
seal assembly
recited
shaft
Prior art date
Application number
PCT/US1992/000147
Other languages
English (en)
Inventor
William E. Key
George Wang
Original Assignee
Bw/Ip International, Inc.
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 Bw/Ip International, Inc. filed Critical Bw/Ip International, Inc.
Publication of WO1992012366A1 publication Critical patent/WO1992012366A1/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
    • F16J15/002—Sealings comprising at least two sealings in succession
    • F16J15/004—Sealings comprising at least two sealings in succession forming of recuperation chamber for the leaking fluid

Definitions

  • This invention relates to a tandem, bi-phase sealing assembly, for example, the combination of a mechanical seal assembly and a magnetic fluid seal assembly for use in apparatus for handling a fluid which is liquid at a pressure in excess of atmospheric and a gas or vapor at atmospheric pressure.
  • sealing assemblies are associated with pumping apparatus where the emission of gas or vapor to the atmosphere is not permissible, especially where there are humans, so that the invention can be used to meet the most stringent Federal and local emission standards for pumps.
  • sealing assemblies to substantially prevent the escape of product fluid along a shaft connecting a rotary device, such as a pump, is well known in the art.
  • the sealing means can be a simple elastomer ring or the like or a more complicated sealing means, such as a mechanical seal.
  • Mechanical seals generally comprise a pair of seal rings, one arranged for rotation with the shaft and the other stationary within the housing. One or both seal rings can be so arranged to be movable axially, toward and away from the other. Both seal rings have a generally planar seal face, the seal face of one seal ring opposing the seal face of the other seal ring. A narrow gap may exist between the two opposing seal faces or they may be in contact. Because of the construction just explained, there is relative rotation between the seal rings. In the majority of seal assemblies, there is slight leakage across the relatively rotating seal rings, which lubricates the seal faces.
  • the combination of a primary mechanical seal assembly and a secondary magnetic fluid seal assembly is proposed.
  • the mechanical seal assembly is most effective when operating with liquids, while the magnetic fluid seal assembly is only effective when operating with vapors or gases.
  • leakage across the faces of the mechanical seal assembly vaporizes and becomes a gas, which gas leakage is sealed from the immediate atmosphere (environment) using a magnetic fluid seal and is vented to a remotely located vapor recovery system or to a remotely located flare where the gas is burned, thus removing the gases or vapors from the work area and the motor.
  • VOC volatile organic compound
  • Typical VOCs include light hydrocarbons, for example, ethane, propane and butane, and many chemical compounds.
  • the leaking fluid enters the atmosphere as a noxious, toxic or hazardous compound.
  • Local, state and federal (EPA) regulatory limits are being placed on emissions of VOCs and volatile hazardous air pollutants (VHAPs) . Near zero emission levels are specified for new pumps in the Los Angeles Basin (Los Angeles, San Bernardino, Orange and Riverside counties) . The EPA requires that carcinogenic vapor emissions must be less than one part per million.
  • the single figure of the drawing is an illustration, primarily in section, of a zero leakage, bi ⁇ phase sealing assembly as constructed according to the invention described herein.
  • the assembly 10 comprises a primary mechanical seal assembly 12 and a secondary magnetic fluid seal assembly 14.
  • the seal assemblies 12 and 14 encircle a shaft 16 connecting a pump 18 and a driving motor 20 (both shown schematically) .
  • the shaft passes through a pump housing 22.
  • the mechanical seal assembly 12 comprises a pair of seal rings 24 and 26, each having opposing seal faces 28 and 30, respectively.
  • the seal ring 24 is fixed against rotation by a pin 32 connected to a flange 34 of the housing 22, while the seal ring 26 is connected for rotation with the shaft 16.
  • One or both seal rings can be axially movable.
  • the seal ring 26 is axially movable and is urged toward the seal ring 24 by a coil spring 36, one end of which abuts a stop 38, while the other end engages a spring follower and face holder 40 which urges the seal ring 26 to its operative position.
  • the seal ring 24 is sealed to the housing flange 34 and the housing 22 by means of an elastomeric O-ring seal 42, as illustrated.
  • the housing is provided with a vent chamber 44 and a conduit 46 is provided to a remotely located vapor recovery system 48 or, in the alternative, to a remotely located flare 50 (both shown schematically) , so that any vapors or gaseous leakage passes through the conduit 46 to the remote location of the recovery system or flare.
  • This seal assembly 14 comprises a flanged housing 52 connected to the pump housing 22 through the flange 34.
  • An annular permanent magnet 56 is fixed within the housing 52 and is radially spaced from the shaft 16.
  • the magnet 56 abuts an annular pole member 58 which extends between the housing 52 and the shaft 16, being slightly radially spaced from the latter and thus defining, with the shaft, a radial gap 60.
  • a ferrofluid 62 occupies the space between the shaft 16 and the pole member 58.
  • the ferrofluid 62 forms the seal with the shaft, permitting the shaft to rotate, but preventing the escape of gaseous fluid or vapor along the shaft from the housing 22 to the immediate atmosphere or environment.
  • the gap 60 may be on the order of 2 to 12 mil, and a variety of ferrofluids may be employed in the assembly described. Typical ferrofluids would include ferrofluids having a magnetization in gauss ranging from 200 to 1000, and a viscosity of 50 cps to 900 cps, at 27 degrees C.
  • the carrier liquid in the ferrofluid usually comprises a nonvolatile liquid carrier, such as a fluorocarbon, silicone oil, hydrocarbon, ester or other liquid carrier with suspended magnetite particles. Also, a dual seal as described and claimed in U.S. Patent No. 4,407,518 may be used, if desired.
  • the primary mechanical seal may be constructed as a cartridge, the components being assembled on a shaft sleeve which surrounds the shaft when the mechanical seal is placed in the bi-phase assembly.
  • other constructions may be used, such, for example, as a bellows seal.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)

Abstract

L'invention concerne un ensemble d'étanchement biphase (10) destiné à empêcher la fuite d'un fluide qui se trouve à l'état liquide à des pressions supérieures à la pression atmosphérique et qui se trouve à l'état gazeux à la pression atmosphérique. Ledit ensemble d'étanchement est réalisé par combinaison d'une garniture mécanique d'étanchéité (12) et d'une garniture d'étanchéité magnétique (14) montées en tandem. Tout fluide à l'état gazeux s'échappant du dispositif est conduit vers un système éloigné d'élimination de fluide, tel qu'un système de récupération de vapeur (48) ou une torchère (50) pour y être brulé.
PCT/US1992/000147 1991-01-11 1992-01-09 Ensemble d'etanchement biphase WO1992012366A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US63988791A 1991-01-11 1991-01-11
US639,887 1991-01-11

Publications (1)

Publication Number Publication Date
WO1992012366A1 true WO1992012366A1 (fr) 1992-07-23

Family

ID=24565988

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1992/000147 WO1992012366A1 (fr) 1991-01-11 1992-01-09 Ensemble d'etanchement biphase

Country Status (1)

Country Link
WO (1) WO1992012366A1 (fr)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997033107A1 (fr) * 1996-03-05 1997-09-12 A & A Environmental Seals, Inc. Appareil et procede de confinement et d'alignement d'emissions pour systemes fluidiques
EP0999364A3 (fr) * 1998-11-04 2001-02-14 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Assemblage d'étanchéité d'arbre avec passage de drainage
US20150330261A1 (en) * 2014-05-15 2015-11-19 Echogen Power Systems, L.L.C. Waste Heat Recovery Systems Having Magnetic Liquid Seals
US10934895B2 (en) 2013-03-04 2021-03-02 Echogen Power Systems, Llc Heat engine systems with high net power supercritical carbon dioxide circuits
US11187112B2 (en) 2018-06-27 2021-11-30 Echogen Power Systems Llc Systems and methods for generating electricity via a pumped thermal energy storage system
US11293309B2 (en) 2014-11-03 2022-04-05 Echogen Power Systems, Llc Active thrust management of a turbopump within a supercritical working fluid circuit in a heat engine system
US11435120B2 (en) 2020-05-05 2022-09-06 Echogen Power Systems (Delaware), Inc. Split expansion heat pump cycle
US11629638B2 (en) 2020-12-09 2023-04-18 Supercritical Storage Company, Inc. Three reservoir electric thermal energy storage system
US12331664B2 (en) 2023-02-07 2025-06-17 Supercritical Storage Company, Inc. Waste heat integration into pumped thermal energy storage

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4889348A (en) * 1987-06-10 1989-12-26 John Crane-Houdaille, Inc. Spiral groove seal system for high vapor-pressure liquids
US4940248A (en) * 1988-03-10 1990-07-10 Firma Carl Freudenberg Seal for a magnetizable shaft

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4889348A (en) * 1987-06-10 1989-12-26 John Crane-Houdaille, Inc. Spiral groove seal system for high vapor-pressure liquids
US4940248A (en) * 1988-03-10 1990-07-10 Firma Carl Freudenberg Seal for a magnetizable shaft

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
INDUSTRIAL SEALING TECHNOLOGY, JOHN WILEY AND SONS, NEW. NEW YORK, BUTCHER, 1979 (see page 415). *
SEALS AND SEALING HANDBOOK, GULF PUBLISHING CO., HOUSTON, TEXAS, WARRING, 1981 see page 312. *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5921552A (en) * 1994-02-08 1999-07-13 A & A Environmental Seals, Inc. Emission containment and alignment apparatus and method for fluid systems
WO1997033107A1 (fr) * 1996-03-05 1997-09-12 A & A Environmental Seals, Inc. Appareil et procede de confinement et d'alignement d'emissions pour systemes fluidiques
EP0999364A3 (fr) * 1998-11-04 2001-02-14 Kabushiki Kaisha Toyoda Jidoshokki Seisakusho Assemblage d'étanchéité d'arbre avec passage de drainage
US10934895B2 (en) 2013-03-04 2021-03-02 Echogen Power Systems, Llc Heat engine systems with high net power supercritical carbon dioxide circuits
US20150330261A1 (en) * 2014-05-15 2015-11-19 Echogen Power Systems, L.L.C. Waste Heat Recovery Systems Having Magnetic Liquid Seals
US11293309B2 (en) 2014-11-03 2022-04-05 Echogen Power Systems, Llc Active thrust management of a turbopump within a supercritical working fluid circuit in a heat engine system
US11187112B2 (en) 2018-06-27 2021-11-30 Echogen Power Systems Llc Systems and methods for generating electricity via a pumped thermal energy storage system
US11435120B2 (en) 2020-05-05 2022-09-06 Echogen Power Systems (Delaware), Inc. Split expansion heat pump cycle
US11629638B2 (en) 2020-12-09 2023-04-18 Supercritical Storage Company, Inc. Three reservoir electric thermal energy storage system
US12331664B2 (en) 2023-02-07 2025-06-17 Supercritical Storage Company, Inc. Waste heat integration into pumped thermal energy storage

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