EP1055824A1 - Scroll-type apparatus - Google Patents

Scroll-type apparatus Download PDF

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Publication number
EP1055824A1
EP1055824A1 EP00303908A EP00303908A EP1055824A1 EP 1055824 A1 EP1055824 A1 EP 1055824A1 EP 00303908 A EP00303908 A EP 00303908A EP 00303908 A EP00303908 A EP 00303908A EP 1055824 A1 EP1055824 A1 EP 1055824A1
Authority
EP
European Patent Office
Prior art keywords
scroll
scroll member
vacuum pump
housing
shaft
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.)
Withdrawn
Application number
EP00303908A
Other languages
German (de)
French (fr)
Inventor
Alan John Saunders
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.)
BOC Group Ltd
Original Assignee
BOC Group Ltd
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 BOC Group Ltd filed Critical BOC Group Ltd
Publication of EP1055824A1 publication Critical patent/EP1055824A1/en
Withdrawn legal-status Critical Current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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/02—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents
    • F04C18/0207—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form
    • F04C18/0215—Rotary-piston pumps specially adapted for elastic fluids of arcuate-engagement type, i.e. with circular translatory movement of co-operating members, each member having the same number of teeth or tooth-equivalents both members having co-operating elements in spiral form where only one member is moving
    • 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

Definitions

  • the present invention relates to scroll apparatus and, more particularly, to scroll apparatus for use in vacuum pumps.
  • Scroll apparatus for operating compressors or vacuum pumps.
  • the apparatus comprises two scroll members each comprising a flat end plate on which are upstanding strips of uniform width defining a spiral (or scroll) type structure which interact by placing the scroll members substantially co-axially together with the respective spiral type structures inter-engaging and allowing one scroll member to "orbit" relative to a stationary member.
  • the orbiting scroll member is caused to "orbit" by allowing it to inter-engage with bearings positioned eccentrically on a rotating drive shaft which is itself driven by a motor.
  • the orbiting scroll member is constrained from rotating by means such as Oldham couplings or other known means.
  • WO96/26366 there is described a vacuum pump incorporating scroll-type apparatus in which the orbiting scroll member is driven by means of a pump shaft that is centrally located in relation to a stationary body.
  • a mechanism is provided for connecting the orbiting scroll member to the stationary body so that it is supported thereby and controls the circular translational motion of the orbiting scroll member.
  • the mechanism comprises at least one bearing supported by the pump shaft and a metallic bellows for limiting undesirable travel in the circular translation of the orbiting scroll member.
  • a vacuum pump of the scroll-type comprises a housing, a first fixed scroll member having an end plate and an involute spiral wrap attached thereto, a second orbital scroll member having an end plate and an involute spiral wrap attached thereto, the scroll members being arranged in the housing such that their respective wraps intermesh so that on orbital movement of the second scroll member relative to the first scroll member a volume of gas will be urged from one end of the wraps to the other end, a shaft for driving the second scroll member and wherein a member is provided which is adapted to separate the vacuum space in the housing from the shaft and also prevent the second scroll member from rotation, said member being made from a polymer material.
  • a scroll-type apparatus in the form of a vacuum pump 2 includes a housing 4 to which is mounted a fixed scroll member 6. Complimenting the fixed scroll member 6 and intermeshing therewith in a manner known per se is an orbital scroll member 8.
  • the orbital member 8 is mounted on bearings 10 in the housing 4 which bearings are supported on a crank end 12 of a drive shaft 14 which extends from a motor (not shown) into the housing 4.
  • Each scroll member 6, 8 includes an end plate 16, 18 to which is attached and from which extends outwardly therefrom an involute spiral wrap 26, 28.
  • the height of each wrap 26, 28 is substantially the same as the distance between opposed end plates 16, 18 so that the free edge of each wrap 26, 28 forms a seal against the face of the complimentary scroll member end plate.
  • a slot is formed in the free edge of each wrap 26, 28 in which is located a tip seal 20.
  • any vacuum pump it is necessary to seal the vacuum space in the housing 4 from ambient atmosphere where the pump shaft 14 goes through the housing 4 from the motor. Furthermore, in a scroll-type vacuum pump it is necessary to prevent the orbiting scroll 8 from rotating.
  • a radial member 30 of polymer material which, as shown is in the form of a quarter circle translated to form an annulus around the shaft 14.
  • the member 30 as shown is anchored at one edge by bolts 32 to the scroll member 8 and at its opposite end to a stationary part of the pump by bolts 34 between the fixed scroll member 6 and the housing 4.
  • the radial member 30 has sufficient flexibility to allow the orbiting motion of the scroll member 8 whilst being tortionally stiff enough to restrain the scroll member 8 in the correct relationship with the fixed scroll member 6. Furthermore, it will of course divide the vacuum space in the pump 2 from the shaft 14 particularly where it passes through the housing 4 from the motor (not shown).
  • the cross section of the annulus can be quarter circle as shown or half circle or cone as appropriate.
  • the member 30 could be reinforced with fibre material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Applications Or Details Of Rotary Compressors (AREA)
  • Rotary Pumps (AREA)

Abstract

A vacuum pump of the scroll-type comprising a housing, a first fixed scroll member having an end plate and an involute spiral wrap attached thereto, a second orbital scroll member having an end plate and an involute spiral wrap attached thereto, the scroll members being arranged in the housing such that their respective wraps intermesh so that on orbital movement of the second scroll member relative to the first scroll member a volume of gas will be trapped and urged from one end of the wraps to the other end, a shaft for driving the second scroll member and wherein a member is provided which is adapted to separate the vacuum space in the housing from the shaft and also prevent the second scroll member from rotating, said member being made from a polymer material.

Description

  • The present invention relates to scroll apparatus and, more particularly, to scroll apparatus for use in vacuum pumps.
  • Scroll apparatus is known for operating compressors or vacuum pumps. In both cases the apparatus comprises two scroll members each comprising a flat end plate on which are upstanding strips of uniform width defining a spiral (or scroll) type structure which interact by placing the scroll members substantially co-axially together with the respective spiral type structures inter-engaging and allowing one scroll member to "orbit" relative to a stationary member.
  • In this way it is possible to trap a volume of gas between the orbiting scroll member and the fixed scroll member thereby to urge the gas from one end of the respective spirals to the other. In a vacuum pump in particular the gas enters via a pump inlet at the periphery of the scroll members and exits via a pump outlet at the centre of the scroll members.
  • The orbiting scroll member is caused to "orbit" by allowing it to inter-engage with bearings positioned eccentrically on a rotating drive shaft which is itself driven by a motor. The orbiting scroll member is constrained from rotating by means such as Oldham couplings or other known means.
  • In PCT publication WO96/26366 there is described a vacuum pump incorporating scroll-type apparatus in which the orbiting scroll member is driven by means of a pump shaft that is centrally located in relation to a stationary body. A mechanism is provided for connecting the orbiting scroll member to the stationary body so that it is supported thereby and controls the circular translational motion of the orbiting scroll member. The mechanism comprises at least one bearing supported by the pump shaft and a metallic bellows for limiting undesirable travel in the circular translation of the orbiting scroll member.
  • It is an aim of the present invention to provide a vacuum pump of the scroll-type which provides a seal between a vacuum space in the pump from atmosphere where the pump shaft extends through the case and also prevents the orbiting scroll member from rotating.
  • According to the present invention a vacuum pump of the scroll-type comprises a housing, a first fixed scroll member having an end plate and an involute spiral wrap attached thereto, a second orbital scroll member having an end plate and an involute spiral wrap attached thereto, the scroll members being arranged in the housing such that their respective wraps intermesh so that on orbital movement of the second scroll member relative to the first scroll member a volume of gas will be urged from one end of the wraps to the other end, a shaft for driving the second scroll member and wherein a member is provided which is adapted to separate the vacuum space in the housing from the shaft and also prevent the second scroll member from rotation, said member being made from a polymer material.
  • An embodiment of the invention will now be described by way of example reference being made to the Figure of the accompanying diagrammatic drawing which is a cross section through a vacuum pump of the scroll type.
  • As shown in the Figure, a scroll-type apparatus in the form of a vacuum pump 2 includes a housing 4 to which is mounted a fixed scroll member 6. Complimenting the fixed scroll member 6 and intermeshing therewith in a manner known per se is an orbital scroll member 8. The orbital member 8 is mounted on bearings 10 in the housing 4 which bearings are supported on a crank end 12 of a drive shaft 14 which extends from a motor (not shown) into the housing 4.
  • Each scroll member 6, 8 includes an end plate 16, 18 to which is attached and from which extends outwardly therefrom an involute spiral wrap 26, 28. The height of each wrap 26, 28 is substantially the same as the distance between opposed end plates 16, 18 so that the free edge of each wrap 26, 28 forms a seal against the face of the complimentary scroll member end plate. To assist in the sealing process a slot is formed in the free edge of each wrap 26, 28 in which is located a tip seal 20.
  • In any vacuum pump it is necessary to seal the vacuum space in the housing 4 from ambient atmosphere where the pump shaft 14 goes through the housing 4 from the motor. Furthermore, in a scroll-type vacuum pump it is necessary to prevent the orbiting scroll 8 from rotating.
  • According to the present invention, the desiderata mentioned above are met by means of a radial member 30 of polymer material which, as shown is in the form of a quarter circle translated to form an annulus around the shaft 14. The member 30 as shown is anchored at one edge by bolts 32 to the scroll member 8 and at its opposite end to a stationary part of the pump by bolts 34 between the fixed scroll member 6 and the housing 4.
  • It will be apparent that the radial member 30 has sufficient flexibility to allow the orbiting motion of the scroll member 8 whilst being tortionally stiff enough to restrain the scroll member 8 in the correct relationship with the fixed scroll member 6. Furthermore, it will of course divide the vacuum space in the pump 2 from the shaft 14 particularly where it passes through the housing 4 from the motor (not shown). The cross section of the annulus can be quarter circle as shown or half circle or cone as appropriate. An advantage of the embodiment described above is that the use of the member 30 of polymer material will reduce the overall weight of the vacuum pump when compared to a vacuum pump containing a metal bellows.
  • If necessary the member 30 could be reinforced with fibre material.

Claims (7)

  1. A vacuum pump of the scroll-type comprising a housing, a first fixed scroll member having an end plate and an involute spiral wrap attached thereto, a second orbital scroll member having an end plate and an involute spiral wrap attached thereto, the scroll members being arranged in the housing such that their respective wraps intermesh so that on orbital movement of the second scroll member relative to the first scroll member a volume of gas will be trapped and urged from one end of the wraps to the other end, a shaft for driving the second scroll member and wherein a member is provided which is adapted to separate the vacuum space in the housing from the shaft and also prevent the second scroll member from rotating, said member being made from a polymer material.
  2. A vacuum pump as claimed in claim 1 in which polymer material is reinforced with fibres.
  3. A vacuum pump as claimed in claim 1 or claim 2 in which the polymer material is in the form of an annulus surrounding the shaft and attached at one end of the second scroll member and at its opposite end to a stationary part of the pump.
  4. A vacuum pump as claimed in claim 3 in which the cross section of the annulus is in the form of a quarter circle.
  5. A vacuum as claimed in claim 3 in which the cross section of the annulus is in the form of a half circle.
  6. A vacuum pump as claimed in claim 3 in which the cross section of the annulus is in the form of a cone.
  7. A vacuum pump constructed arranged and adapted to operated substantially as here before described with reference and as illustrated in the Figure of the accompanying drawing.
EP00303908A 1999-05-26 2000-05-10 Scroll-type apparatus Withdrawn EP1055824A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9912212.9A GB9912212D0 (en) 1999-05-26 1999-05-26 Scroll-type apparatus
GB9912212 1999-05-26

Publications (1)

Publication Number Publication Date
EP1055824A1 true EP1055824A1 (en) 2000-11-29

Family

ID=10854169

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00303908A Withdrawn EP1055824A1 (en) 1999-05-26 2000-05-10 Scroll-type apparatus

Country Status (2)

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EP (1) EP1055824A1 (en)
GB (1) GB9912212D0 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10225774C1 (en) * 2002-06-10 2003-12-11 Vacuubrand Gmbh & Co Kg Vacuum pump, for condensing and aggressive gases, is a dry pump with a membrane pump stage and a spiral scroll pump stage
EP1413759A3 (en) * 2002-10-25 2004-05-26 Kabushiki Kaisha Toyota Jidoshokki Scroll type compressor
WO2004072483A1 (en) * 2003-02-17 2004-08-26 The Boc Group Plc A scroll pump and method of assembling same
WO2005045249A1 (en) * 2003-10-27 2005-05-19 The Boc Group Plc Scroll-type vacuum pump
DE102005042451A1 (en) * 2005-09-06 2007-03-15 Vacuubrand Gmbh + Co Kg Vacuum pumping device for use as oil-lubricated rotary vane pump, has drive and rotary units arranged such that transient area has sealing units separating conveying area from drive area, where one of sealing units is ferrous fluid seal
EP4083375A3 (en) * 2021-04-26 2023-02-15 Dabir Surfaces, Inc. Center camshaft scroll pump

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3194167A (en) * 1964-01-22 1965-07-13 Lapp Insulator Company Inc Pump
GB2018900A (en) * 1978-04-11 1979-10-24 Ito Kazuichi Rotary positive displacement fluid-machines
JPS5859392A (en) * 1981-10-05 1983-04-08 Nippon Soken Inc Scroll type pump
WO1996026366A1 (en) 1995-02-24 1996-08-29 S.B.P.V. (Societe Des Brevets P. Vulliez) Vacuum pump with circular translation cycle

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3194167A (en) * 1964-01-22 1965-07-13 Lapp Insulator Company Inc Pump
GB2018900A (en) * 1978-04-11 1979-10-24 Ito Kazuichi Rotary positive displacement fluid-machines
JPS5859392A (en) * 1981-10-05 1983-04-08 Nippon Soken Inc Scroll type pump
WO1996026366A1 (en) 1995-02-24 1996-08-29 S.B.P.V. (Societe Des Brevets P. Vulliez) Vacuum pump with circular translation cycle

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 7, no. 149 (M - 225)<1294> 30 June 1983 (1983-06-30) *

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10225774C1 (en) * 2002-06-10 2003-12-11 Vacuubrand Gmbh & Co Kg Vacuum pump, for condensing and aggressive gases, is a dry pump with a membrane pump stage and a spiral scroll pump stage
EP1413759A3 (en) * 2002-10-25 2004-05-26 Kabushiki Kaisha Toyota Jidoshokki Scroll type compressor
US6872063B2 (en) 2002-10-25 2005-03-29 Kabushiki Kaisha Toyota Jidoshokki Scroll type compressor having an elastic member urging the movable scroll member toward the fixed scroll member
WO2004072483A1 (en) * 2003-02-17 2004-08-26 The Boc Group Plc A scroll pump and method of assembling same
WO2005045249A1 (en) * 2003-10-27 2005-05-19 The Boc Group Plc Scroll-type vacuum pump
DE102005042451A1 (en) * 2005-09-06 2007-03-15 Vacuubrand Gmbh + Co Kg Vacuum pumping device for use as oil-lubricated rotary vane pump, has drive and rotary units arranged such that transient area has sealing units separating conveying area from drive area, where one of sealing units is ferrous fluid seal
DE102005042451B4 (en) * 2005-09-06 2007-07-26 Vacuubrand Gmbh + Co Kg Vacuum pump device
EP4083375A3 (en) * 2021-04-26 2023-02-15 Dabir Surfaces, Inc. Center camshaft scroll pump
EP4177439A1 (en) * 2021-04-26 2023-05-10 Dabir Surfaces, Inc. Center camshaft scroll pump

Also Published As

Publication number Publication date
GB9912212D0 (en) 1999-07-28

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