EP0698185B1 - Rotary screw compressor with seal means - Google Patents

Rotary screw compressor with seal means Download PDF

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Publication number
EP0698185B1
EP0698185B1 EP94910075A EP94910075A EP0698185B1 EP 0698185 B1 EP0698185 B1 EP 0698185B1 EP 94910075 A EP94910075 A EP 94910075A EP 94910075 A EP94910075 A EP 94910075A EP 0698185 B1 EP0698185 B1 EP 0698185B1
Authority
EP
European Patent Office
Prior art keywords
compressor
seal
pressure
cavity
seal means
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 - Lifetime
Application number
EP94910075A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0698185A1 (en
Inventor
Roland Pamlin
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.)
Svenska Rotor Maskiner AB
Original Assignee
Svenska Rotor Maskiner AB
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 Svenska Rotor Maskiner AB filed Critical Svenska Rotor Maskiner AB
Publication of EP0698185A1 publication Critical patent/EP0698185A1/en
Application granted granted Critical
Publication of EP0698185B1 publication Critical patent/EP0698185B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C27/00—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids
    • F04C27/008—Sealing arrangements in rotary-piston pumps specially adapted for elastic fluids for other than working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • F04C27/009—Shaft sealings specially adapted for pumps

Definitions

  • the present invention relates to a rotary screw compressor of the kind specified in the preamble of claim 1.
  • US-A 3 913 346 discloses a refrigeration compressor of the twin-screw type, in which the drive motor is internally cooled by liquid refrigerant of delivery pressure supplied from the condenser, and the liquid and evaporated gas is then drained to a closed working chamber in the compressor working space.
  • the loss in compressor efficiency which is entailed with that system can be avoided by providing a pump for raising the pressure of the liquid before entering the motor space, so that the liquid-gas-mixture leaving the motor can be drained directly to the delivery line of the compressor.
  • US-A 4 669 279 discloses such a system in connection with a centrifugal compressor.
  • the object of the present invention is to attain a compressor with a seal between the low pressure end of the compressor working space and a high pressure cavity at the other side of the low pressure end wall, which seal should be effective as well as economical in operation.
  • Fig. 1 is a schematic illustration of a refrigeration system with a compressor according to the invention.
  • Fig. 2 is a section through the seal means in the low pressure end section of the compressor in fig. 1.
  • the refrigeration system in fig. 1 has a hermetic compressor-motor unit with a twin-screw rotary compressor 1, the low pressure end of which is connected to an electric motor 2. At the high pressure end of the compressor an oil separator 3 is provided for separating oil from the working fluid, which oil has been injected into the compressor working space for sealing, cooling and lubricating purposes.
  • the refrigeration system is of conventional type including a condenser 4, an expansion valve 6 and an evaporator 5 connected by pipes, 8, 9, 10 to form a closed refrigeration circuit. Liquid refrigerant is supplied from the condenser 4 through a pipe 11 to the motor 2 for cooling the motor windings 18. In the pipe 11 a pump 7 is provided for raising the pressure to a level about 1 to 2 bars above delivery pressure.
  • the liquid refrigerant When cooling the motor windings 18 the liquid refrigerant will partly be evaporated, and the gas-liquid mixture is drained to the discharge line of the compressor. In the illustrated embodiment the gas-liquid mixture is drained to the oil separator 3 where the remaining liquid is evaporated for cooling the oil.
  • One of the rotors 13 of the compressor is directly driven by the motor 2 through a shaft 14 extending through the low pressure end section 15 of the compressor.
  • roller bearings 16 and a seal arrangement 17 for sealing between the low pressure end of the compressor, where the pressure is about evaporating or suction pressure and the motor space where the pressure is 1 to 2 bars above condensing or delivery pressure.
  • the seal arrangement is illustrated in fig. 2 in an enlarged section.
  • the shaft 14, including a shaft sleeve 21, is extending through the low pressure end section 15 of the compressor and is at its left end connected to the motor 2 and at its right end to one of the compressor rotors 13.
  • the seal arrangement 17 is on its left side exposed to a cavity communicating with the motor space and thus having a pressure above delivery pressure and on its right side to a cavity communicating with the low pressure end of the compressor working space and thus having a pressure corresponding to the compressor inlet pressure.
  • a lip seal 20 Adjacent to the high pressure cavity a lip seal 20 is provided and adjacent to the low pressure cavity there is a non-contacting seal 24.
  • An intermediate chamber 22 is formed between these two seals 20, 24, to which chamber oil of about delivery pressure is supplied through a nozzle 23, connected by a supply channel 28 to a source of oil under pressure, normally the oil separator of the compressor.
  • the sealing is accomplished by a non-contacting seal 24, allowing the supplied oil to leak from the intermediate chamber 22 through the seal gap 27 to the compressor working space.
  • the non-contacting seal can be of any kind, e.g. a labyrinth seal
  • the preferred embodiment shown in the figure employs a so called floating seal of the type disclosed in US-A 5 009 583.
  • the seal gap 27 can be as small as desired, since the seal body 24 is radially movable while being axially kept in a fixed position by the supports 25, 26 on either side.
  • the seal body 24 is squeezed between these supports 25, 26 with a force large enough to prevent rotation but low enough to allow the seal body 24 to move radially.
  • the seal body 24 thus is self-centering around the sleeve 21 ofthe shaft 14.
  • the blocking oil leaking from the intermediate chamber 22 to the compressor working space passes the roller bearings 16 supporting the shaft and is used to lubricate these.
  • the seal gap 27 therefore must be dimensioned so that the leakage is sufficient for that lubrication requirement.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Compressor (AREA)
EP94910075A 1993-05-14 1994-02-04 Rotary screw compressor with seal means Expired - Lifetime EP0698185B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9301662 1993-05-14
SE9301662A SE9301662L (sv) 1993-05-14 1993-05-14 Skruvkompressor med tätningsorgan
PCT/SE1994/000087 WO1994027050A1 (en) 1993-05-14 1994-02-04 Rotary screw compressor with seal means

Publications (2)

Publication Number Publication Date
EP0698185A1 EP0698185A1 (en) 1996-02-28
EP0698185B1 true EP0698185B1 (en) 1997-10-08

Family

ID=20389942

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94910075A Expired - Lifetime EP0698185B1 (en) 1993-05-14 1994-02-04 Rotary screw compressor with seal means

Country Status (5)

Country Link
EP (1) EP0698185B1 (sv)
DE (1) DE69406134T2 (sv)
DK (1) DK0698185T3 (sv)
SE (1) SE9301662L (sv)
WO (1) WO1994027050A1 (sv)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3493850B2 (ja) * 1995-11-22 2004-02-03 石川島播磨重工業株式会社 機械駆動式過給機のシール構造
WO1998042951A1 (fr) * 1997-03-26 1998-10-01 Zakrytoe Aktsionernoe Obschestvo 'nezavisimaya Energetika' Machine a vapeur a vis
JPH11270484A (ja) * 1998-03-24 1999-10-05 Taiko Kikai Industries Co Ltd スクリューロータ型ウエット真空ポンプ
DE29807796U1 (de) * 1998-04-30 1999-09-09 Ghh Rand Schraubenkompressoren Dichtungsanordnung für einen Wellenzapfen eines trockenlaufenden Rotationsschraubenverdichters
FR2853699B1 (fr) * 2003-04-08 2008-02-29 Cyclam Sas Compresseur rotatif a gaz
CN101975160B (zh) * 2010-11-16 2014-12-03 上海维尔泰克螺杆机械有限公司 双螺杆液体泵
US9022760B2 (en) * 2011-11-02 2015-05-05 Trane International Inc. High pressure seal vent
JP6707021B2 (ja) * 2016-12-22 2020-06-10 株式会社日立産機システム スクリュー圧縮機
DE102018205932A1 (de) * 2018-04-18 2019-10-24 Henkel Ag & Co. Kgaa Pumpe mit einer Produktkammer

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913346A (en) * 1974-05-30 1975-10-21 Dunham Bush Inc Liquid refrigerant injection system for hermetic electric motor driven helical screw compressor
DE3503039A1 (de) * 1985-01-30 1986-07-31 Wankel Gmbh, 1000 Berlin Wellendichtung zwischen kaeltekompressor und antriebsmotor
US4669279A (en) * 1985-03-19 1987-06-02 Ebara Corporation Motor cooling apparatus for refrigerator

Also Published As

Publication number Publication date
EP0698185A1 (en) 1996-02-28
WO1994027050A1 (en) 1994-11-24
SE9301662D0 (sv) 1993-05-14
SE500488C2 (sv) 1994-07-04
SE9301662L (sv) 1994-07-04
DK0698185T3 (da) 1998-05-18
DE69406134T2 (de) 1998-04-09
DE69406134D1 (de) 1997-11-13

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