US20080124236A1 - Scroll-Type Apparatus - Google Patents
Scroll-Type Apparatus Download PDFInfo
- Publication number
- US20080124236A1 US20080124236A1 US11/792,337 US79233705A US2008124236A1 US 20080124236 A1 US20080124236 A1 US 20080124236A1 US 79233705 A US79233705 A US 79233705A US 2008124236 A1 US2008124236 A1 US 2008124236A1
- Authority
- US
- United States
- Prior art keywords
- scroll member
- orbital
- stator
- rods
- drive 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.)
- Abandoned
Links
- 238000005086 pumping Methods 0.000 claims abstract description 3
- 239000002131 composite material Substances 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Images
Classifications
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- 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
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/0042—Driving elements, brakes, couplings, transmissions specially adapted for pumps
- F04C29/005—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions
- F04C29/0057—Means for transmitting movement from the prime mover to driven parts of the pump, e.g. clutches, couplings, transmissions for eccentric movement
-
- 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
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/008—Hermetic pumps
-
- 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
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
-
- 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
Definitions
- the present invention relates to scroll-type apparatus and, more particularly, to scroll-type apparatus for use in vacuum pumps.
- Scroll-type apparatus for operating compressors or vacuum pumps.
- the apparatus comprises two scroll members each comprising a flat end plate on which are upstanding strips defining a spiral (or scroll) type structure which interact by placing the scroll members together with the respective spiral type structures inter-engaging and allowing one scroll member to “orbit” relative to the other.
- a spiral (or scroll) type structure which interact by placing the scroll members together with the respective spiral type structures inter-engaging and allowing one scroll member to “orbit” relative to the other.
- 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.
- FIG. 1 illustrates one known arrangement of such scroll-type apparatus in the form of a vacuum pump 2 , which includes a stator 4 comprising 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 , which are supported on a crank end 12 of a drive shaft 14 extending from a motor 16 . Bearings 17 serve to support the drive shaft 14 relative to the housing 4 .
- Each scroll member 6 , 8 includes an end plate to which is attached and from which extends outwardly therefrom a spiral wrap 18 , 20 .
- each wrap 18 , 20 is substantially the same as the distance between the opposed end plates so that the free edge of each wrap 18 , 20 forms a seal against the face of the complimentary scroll member end plate.
- complaint tip seals are commonly provided at the free edge of each wrap 18 , 20 to take up the axial clearance between the edge of each wrap 18 , 20 and the end plate of the opposing scroll member.
- a pumped gas is drawn into the pump 2 from inlet 22 and exits via outlet 24 and non-return valve 25 .
- a metal bellows 26 is disposed substantially co-axially with the drive shaft 14 .
- the metal bellows is attached at one end by bolts 28 to the orbital scroll member 8 and at its opposite end to a stationary part 30 of the pump by bolts 32 .
- O-rings 29 , 31 serve to seal the attachment of the metal bellows 26 .
- the bellows 26 serves to limit undesirable travel in the circular translation of the orbital scroll member 26 and thus maintain the correct angular position between the fixed scroll member 6 and the orbital scroll member 8 .
- the use of such bellows restricts the design of any vacuum pump incorporating such bellows to the dimensions of adequately sized bellows having the required torsional stiffness and sufficient radial freedom for required crank throw to achieve in practice an acceptable life.
- compliant tip seals to provide axial sealing between the scroll members 6 , 8 can generate the dust due to erosion of tip seals during use of the pump. Whilst this dust is generally conveyed through the outlet 24 together with the exhaust gas, when the pump is switched off this dust could migrate through the inlet 22 towards the evacuated apparatus, leading to unwanted contamination of the evacuated apparatus.
- the tip seals therefore require regular replacement, and their use further restricts the design of any vacuum pump incorporating such seals to the dimensions of adequately sized tip seals.
- the present invention provides scroll-type pumping apparatus comprising a stator comprising a fixed scroll member having an end plate with a first spiral wrap extending therefrom, an orbital scroll member having an end plate with a second spiral wrap extending therefrom to intermesh with the first spiral wrap, means for driving the orbital scroll member to orbit relative to the fixed scroll member, and a plurality of flexible rods each having one end connected to the orbital scroll member and another end connected to the stator to support the orbital scroll member relative to the stator.
- the rods may also serve to inhibit rotation of the orbital scroll member relative to the fixed scroll member, so that there is no requirement for a separate device for inhibiting rotation of the orbital scroll member. Therefore, the present invention also provides use of a plurality of rods in a scroll-type apparatus having a fixed scroll member and a orbital scroll member, to inhibit rotation of the orbital scroll member relative to the fixed scroll member. Whilst a bellows may be provided to separate a vacuum space from the ambient atmosphere, there is no requirement for the bellows to have a particular torsional stiffness. As a result, there is a greater freedom of design of a vacuum pump incorporating the apparatus of the present invention, enabling a relatively small, low cost pump to be provided which has good axial sealing between the scroll members. However, an additional device such as an Oldham coupling may be provided between the orbital scroll member and the stator for preventing rotation of the orbital scroll member relative to the fixed scroll member.
- an additional device such as an Oldham coupling may be provided between the orbital scroll member and the
- An abrasive coating may be provided on a surface of at least one of the scroll members.
- the coating may extend over the surface of the end plate and the spiral wrap of the, or each, scroll member.
- the driving means preferably comprises a drive shaft having a crank connected to the orbital scroll member and positioned such that rotation of the drive shaft about a longitudinal axis thereof causes the orbital scroll member to orbit about the longitudinal axis.
- the flexible rods preferably extend about a longitudinal axis of the drive shaft.
- a flexible member such as a bellows may be provided for separating a vacuum space in the stator from ambient atmosphere.
- the flexible member may be substantially co-axial with, and/or arranged about, the flexible rods.
- the rods may be formed from a metallic or composite material.
- the scroll-type apparatus may be used as either a compressor or as an expander, and so the present invention further provides scroll-type apparatus comprising a stator comprising a fixed scroll member having an end plate with a first spiral wrap extending therefrom, an orbital scroll member having an end plate with a second spiral wrap extending therefrom to intermesh with the first spiral wrap, means for driving the orbital scroll member to orbit relative to the fixed scroll member, and a plurality of flexible rods each having one end connected to the orbital scroll member and another end connected to the stator to support the orbital scroll member relative to the stator.
- a stator comprising a fixed scroll member having an end plate with a first spiral wrap extending therefrom, an orbital scroll member having an end plate with a second spiral wrap extending therefrom to intermesh with the first spiral wrap, means for driving the orbital scroll member to orbit relative to the fixed scroll member, and a plurality of flexible rods each having one end connected to the orbital scroll member and another end connected to the stator to support the orbital scroll member
- FIG. 1 is a cross-section through a known scroll-type vacuum pump
- FIG. 2 is a simplified cross-section through a first embodiment of a scroll-type vacuum pump
- FIG. 3 is a simplified cross-section through a second embodiment of a scroll-type vacuum pump.
- FIG. 4 is a cross-section through the vacuum pump of FIG. 1 modified according to the present invention.
- a first embodiment of a scroll-type apparatus is in the form of a vacuum pump 102 , which includes a stator 104 comprising a fixed scroll member 106 . Complimenting the fixed scroll member 106 and intermeshing therewith in a manner known per se is an orbital scroll member 108 .
- the orbital member 108 is attached to a crank provided at one end of the drive shaft 112 , which extends from a motor 114 .
- Bearings 116 serve to radially support the drive shaft 112 relative to the stator 104 .
- Each scroll member 106 , 108 includes an end plate to which is attached and from which extends outwardly therefrom a spiral wrap 118 , 120 .
- each wrap 118 , 120 is substantially the same as the distance between the opposed end plates so that the free edge of each wrap 118 , 120 forms a seal against the face of the complimentary scroll member end plate.
- An abrasive coating may be provided on the end plate and wrap of at least one of the scroll members 106 , 108 .
- the orbital scroll member 108 is supported axially relative to the fixed scroll member 106 by a plurality of flexible rods 122 provided about the longitudinal axis of the drive shaft 112 .
- One end of each rod 122 is secured to the stator 104 by any suitable means, for example, adhesive or bolts, and the other end of each rod is similarly secured to the end plate of the orbital scroll member 108 .
- At least three rods 122 are generally required, although any number may be provided.
- the rods 122 may be formed from any suitable material having a stiffness that allows the rods 122 to flex to allow the orbital scroll member 108 to orbit about the longitudinal axis of the drive shaft 112 relative to the fixed scroll member 106 .
- the rods 122 may be formed from metallic material, such as steel, or a composite material, such as an organic matrix composite material comprising a resin filled with reinforcing particles and/or fibres. This material is preferably a thermosetting resin, such as epoxy, filled with reinforcing carbon fibres.
- the rods 122 also serve to inhibit rotation of the orbital scroll member 108 relative to the fixed scroll member 106 .
- an Oldham coupling may be provided between the stator 102 and the orbital member 108 to inhibit rotation of the orbital scroll member 108 relative to the fixed scroll member 106 .
- the end plate of the fixed scroll member 106 is integral with the stator 104 .
- the end plate of the fixed scroll member 106 may be provided in the form of a plate mounted on the stator by any convenient method.
- the fixed scroll member 106 is mounted on, or integral with, an enclosure 124 for the motor 114 , the drive shaft 112 passing through an aperture provided in the fixed scroll member 106 and supported therein by bearings 116 .
- the rods 122 may be provided in combination with a flexible member 126 for sealing a vacuum space of the pump from the ambient atmosphere, as previously illustrated in FIG. 1 , and where like reference numerals indicate the same features as shown in FIG. 1 .
- the rods 122 are external to the flexible member, preferably provided in the form of a bellows 126 , although, as an alternative, the bellows 126 may surround the rods 122 .
- the bellows 126 are not required to have a torsional stiffness necessary to inhibit rotation of the orbital scroll member 8 , as this functionality is provided by the rods 122 , and so the bellows 126 may be formed from less rigid, and therefore less expensive, material.
- the stiffness of the rods 122 is such that the natural frequency of the orbital scroll member 8 , 108 in a translational (x or y, or combination of both, i.e. circular) mode is matched to the operating speed of the pump 2 , 102 .
- radial forces on the drive crank are greatly reduced, allowing a smaller bearing to be used.
- Damping devices may also be used to give a flatter response curve and make tuning of the pump more tolerant.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
Description
- The present invention relates to scroll-type apparatus and, more particularly, to scroll-type apparatus for use in vacuum pumps.
- Scroll-type 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 defining a spiral (or scroll) type structure which interact by placing the scroll members together with the respective spiral type structures inter-engaging and allowing one scroll member to “orbit” relative to the other. In this way it is possible to trap a volume of gas between the scroll members 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.
-
FIG. 1 illustrates one known arrangement of such scroll-type apparatus in the form of avacuum pump 2, which includes astator 4 comprising afixed scroll member 6. Complimenting thefixed scroll member 6 and intermeshing therewith in a manner known per se is anorbital scroll member 8. Theorbital member 8 is mounted onbearings 10, which are supported on acrank end 12 of adrive shaft 14 extending from amotor 16.Bearings 17 serve to support thedrive shaft 14 relative to thehousing 4. Eachscroll member spiral wrap wrap wrap wrap wrap - In use, a pumped gas is drawn into the
pump 2 frominlet 22 and exits viaoutlet 24 andnon-return valve 25. In order to seal the vacuum space in thehousing 4 from ambient atmosphere and the pump drive system, ametal bellows 26 is disposed substantially co-axially with thedrive shaft 14. The metal bellows is attached at one end bybolts 28 to theorbital scroll member 8 and at its opposite end to astationary part 30 of the pump bybolts 32. O-rings metal bellows 26. - By virtue of the torsional stiffness of the
metal bellows 26, thebellows 26 also, serves to limit undesirable travel in the circular translation of theorbital scroll member 26 and thus maintain the correct angular position between thefixed scroll member 6 and theorbital scroll member 8. However, the use of such bellows restricts the design of any vacuum pump incorporating such bellows to the dimensions of adequately sized bellows having the required torsional stiffness and sufficient radial freedom for required crank throw to achieve in practice an acceptable life. - Furthermore, the use of compliant tip seals to provide axial sealing between the
scroll members outlet 24 together with the exhaust gas, when the pump is switched off this dust could migrate through theinlet 22 towards the evacuated apparatus, leading to unwanted contamination of the evacuated apparatus. The tip seals therefore require regular replacement, and their use further restricts the design of any vacuum pump incorporating such seals to the dimensions of adequately sized tip seals. - It is an aim of at least the preferred embodiment of the present invention to solve these and other problems.
- The present invention provides scroll-type pumping apparatus comprising a stator comprising a fixed scroll member having an end plate with a first spiral wrap extending therefrom, an orbital scroll member having an end plate with a second spiral wrap extending therefrom to intermesh with the first spiral wrap, means for driving the orbital scroll member to orbit relative to the fixed scroll member, and a plurality of flexible rods each having one end connected to the orbital scroll member and another end connected to the stator to support the orbital scroll member relative to the stator.
- The use of such rods can provide support of the orbital scroll member relative to the stator with a high degree of axial accuracy, thus enabling very close running clearances between the edge of each spiral wrap and the end plate of the opposite scroll member without the need for tip seals, and so the generation of dust associated with the use of tip seals is avoided.
- The rods may also serve to inhibit rotation of the orbital scroll member relative to the fixed scroll member, so that there is no requirement for a separate device for inhibiting rotation of the orbital scroll member. Therefore, the present invention also provides use of a plurality of rods in a scroll-type apparatus having a fixed scroll member and a orbital scroll member, to inhibit rotation of the orbital scroll member relative to the fixed scroll member. Whilst a bellows may be provided to separate a vacuum space from the ambient atmosphere, there is no requirement for the bellows to have a particular torsional stiffness. As a result, there is a greater freedom of design of a vacuum pump incorporating the apparatus of the present invention, enabling a relatively small, low cost pump to be provided which has good axial sealing between the scroll members. However, an additional device such as an Oldham coupling may be provided between the orbital scroll member and the stator for preventing rotation of the orbital scroll member relative to the fixed scroll member.
- An abrasive coating may be provided on a surface of at least one of the scroll members. The coating may extend over the surface of the end plate and the spiral wrap of the, or each, scroll member.
- The driving means preferably comprises a drive shaft having a crank connected to the orbital scroll member and positioned such that rotation of the drive shaft about a longitudinal axis thereof causes the orbital scroll member to orbit about the longitudinal axis. The flexible rods preferably extend about a longitudinal axis of the drive shaft.
- As mentioned above, a flexible member such as a bellows may be provided for separating a vacuum space in the stator from ambient atmosphere. The flexible member may be substantially co-axial with, and/or arranged about, the flexible rods.
- The rods may be formed from a metallic or composite material.
- The scroll-type apparatus may be used as either a compressor or as an expander, and so the present invention further provides scroll-type apparatus comprising a stator comprising a fixed scroll member having an end plate with a first spiral wrap extending therefrom, an orbital scroll member having an end plate with a second spiral wrap extending therefrom to intermesh with the first spiral wrap, means for driving the orbital scroll member to orbit relative to the fixed scroll member, and a plurality of flexible rods each having one end connected to the orbital scroll member and another end connected to the stator to support the orbital scroll member relative to the stator.
- Preferred features of the present invention will now be described with reference to the accompanying drawings, in which:
-
FIG. 1 is a cross-section through a known scroll-type vacuum pump; -
FIG. 2 is a simplified cross-section through a first embodiment of a scroll-type vacuum pump; -
FIG. 3 is a simplified cross-section through a second embodiment of a scroll-type vacuum pump; and -
FIG. 4 is a cross-section through the vacuum pump ofFIG. 1 modified according to the present invention. - With reference to
FIG. 2 , a first embodiment of a scroll-type apparatus is in the form of avacuum pump 102, which includes astator 104 comprising a fixedscroll member 106. Complimenting the fixedscroll member 106 and intermeshing therewith in a manner known per se is anorbital scroll member 108. Theorbital member 108 is attached to a crank provided at one end of thedrive shaft 112, which extends from amotor 114.Bearings 116 serve to radially support thedrive shaft 112 relative to thestator 104. Eachscroll member spiral wrap wrap wrap scroll members - The
orbital scroll member 108 is supported axially relative to thefixed scroll member 106 by a plurality offlexible rods 122 provided about the longitudinal axis of thedrive shaft 112. One end of eachrod 122 is secured to thestator 104 by any suitable means, for example, adhesive or bolts, and the other end of each rod is similarly secured to the end plate of theorbital scroll member 108. At least threerods 122 are generally required, although any number may be provided. Therods 122 may be formed from any suitable material having a stiffness that allows therods 122 to flex to allow theorbital scroll member 108 to orbit about the longitudinal axis of thedrive shaft 112 relative to thefixed scroll member 106. For example, therods 122 may be formed from metallic material, such as steel, or a composite material, such as an organic matrix composite material comprising a resin filled with reinforcing particles and/or fibres. This material is preferably a thermosetting resin, such as epoxy, filled with reinforcing carbon fibres. In this embodiment, therods 122 also serve to inhibit rotation of theorbital scroll member 108 relative to thefixed scroll member 106. Alternatively, an Oldham coupling may be provided between thestator 102 and theorbital member 108 to inhibit rotation of theorbital scroll member 108 relative to thefixed scroll member 106. - In the embodiment shown in
FIG. 2 , the end plate of the fixedscroll member 106 is integral with thestator 104. Alternatively, the end plate of the fixedscroll member 106 may be provided in the form of a plate mounted on the stator by any convenient method. For example, in the second embodiment shown inFIG. 3 , thefixed scroll member 106 is mounted on, or integral with, anenclosure 124 for themotor 114, thedrive shaft 112 passing through an aperture provided in thefixed scroll member 106 and supported therein bybearings 116. - As shown in
FIG. 4 , therods 122 may be provided in combination with aflexible member 126 for sealing a vacuum space of the pump from the ambient atmosphere, as previously illustrated inFIG. 1 , and where like reference numerals indicate the same features as shown inFIG. 1 . In the example shown inFIG. 4 , therods 122 are external to the flexible member, preferably provided in the form of abellows 126, although, as an alternative, thebellows 126 may surround therods 122. In this example, unlike thebellows 26 of the prior art shown inFIG. 1 , thebellows 126 are not required to have a torsional stiffness necessary to inhibit rotation of theorbital scroll member 8, as this functionality is provided by therods 122, and so thebellows 126 may be formed from less rigid, and therefore less expensive, material. - In a further refinement of the design, the stiffness of the
rods 122 is such that the natural frequency of theorbital scroll member pump
Claims (11)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0426937.9 | 2004-12-08 | ||
GBGB0426937.9A GB0426937D0 (en) | 2004-12-08 | 2004-12-08 | Scroll-type apparatus |
PCT/GB2005/004417 WO2006061559A1 (en) | 2004-12-08 | 2005-11-16 | Scroll-type apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080124236A1 true US20080124236A1 (en) | 2008-05-29 |
Family
ID=34073397
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/792,337 Abandoned US20080124236A1 (en) | 2004-12-08 | 2005-11-16 | Scroll-Type Apparatus |
Country Status (7)
Country | Link |
---|---|
US (1) | US20080124236A1 (en) |
EP (1) | EP1825145A1 (en) |
JP (1) | JP2008523301A (en) |
KR (1) | KR20070091136A (en) |
CN (1) | CN101072949A (en) |
GB (1) | GB0426937D0 (en) |
WO (1) | WO2006061559A1 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20070269327A1 (en) * | 2006-05-22 | 2007-11-22 | Nanjing Aotecar Refrigerating Compressor Co., Ltd. | Constant Pressure Type and Fully Enclosed Scroll Compressor for Vehicle |
US20090180909A1 (en) * | 2006-01-12 | 2009-07-16 | Nigel Paul Schofield | Scroll-Type Apparatus |
US20130039791A1 (en) * | 2010-04-28 | 2013-02-14 | Edwards Limited | Scroll pump |
US20140271305A1 (en) * | 2013-03-13 | 2014-09-18 | Agilent Technologies, Inc. | Scroll Pump Having Bellows Providing Angular Synchronization and Back-up System For Bellows |
US9328730B2 (en) | 2013-04-05 | 2016-05-03 | Agilent Technologies, Inc. | Angular synchronization of stationary and orbiting plate scroll blades in a scroll pump using a metallic bellows |
US9366255B2 (en) | 2013-12-02 | 2016-06-14 | Agilent Technologies, Inc. | Scroll vacuum pump having external axial adjustment mechanism |
WO2021202189A1 (en) * | 2020-04-02 | 2021-10-07 | Idex Health And Science Llc | Precision volumetric pump with a bellows hermetic seal |
US11933296B2 (en) | 2019-02-18 | 2024-03-19 | Edwards Limited | Orbital pump |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2472635A (en) * | 2009-08-14 | 2011-02-16 | Edwards Ltd | Seal-less tip scroll booster pump for spectrometer |
CN102588286B (en) * | 2011-01-13 | 2015-03-18 | 珠海格力节能环保制冷技术研究中心有限公司 | Vortex compressor sealing structure and vortex compressor containing same |
JP5594846B2 (en) * | 2011-04-22 | 2014-09-24 | 株式会社ヴァレオジャパン | Scroll compressor |
CN104653451A (en) * | 2015-02-09 | 2015-05-27 | 温岭市红宝石真空设备厂(普通合伙) | Vortex pump |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3560119A (en) * | 1967-12-18 | 1971-02-02 | Krauss Maffei Ag | Fluid pump or motor |
US3802809A (en) * | 1971-06-01 | 1974-04-09 | P Vulliez | Completely dry and fluid-tight vacuum pumps |
US4610611A (en) * | 1985-10-15 | 1986-09-09 | Sundstrand Corporation | Scroll type positive displacement apparatus with tension rods secured between scrolls |
US5366358A (en) * | 1993-01-27 | 1994-11-22 | Grenci Charles A | Oil free scroll vacuum pump |
US5987894A (en) * | 1996-07-16 | 1999-11-23 | Commissariat A L'energie Atomique | Temperature lowering apparatus using cryogenic expansion with the aid of spirals |
US6764288B1 (en) * | 2003-11-06 | 2004-07-20 | Varian, Inc. | Two stage scroll vacuum pump |
-
2004
- 2004-12-08 GB GBGB0426937.9A patent/GB0426937D0/en not_active Ceased
-
2005
- 2005-11-16 US US11/792,337 patent/US20080124236A1/en not_active Abandoned
- 2005-11-16 WO PCT/GB2005/004417 patent/WO2006061559A1/en active Application Filing
- 2005-11-16 KR KR1020077012854A patent/KR20070091136A/en not_active Withdrawn
- 2005-11-16 CN CNA2005800423471A patent/CN101072949A/en active Pending
- 2005-11-16 EP EP05803793A patent/EP1825145A1/en not_active Withdrawn
- 2005-11-16 JP JP2007544967A patent/JP2008523301A/en not_active Abandoned
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Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090180909A1 (en) * | 2006-01-12 | 2009-07-16 | Nigel Paul Schofield | Scroll-Type Apparatus |
US8323006B2 (en) * | 2006-01-12 | 2012-12-04 | Edwards Limited | Scroll pump with an electromagnetic drive mechanism |
US20070269327A1 (en) * | 2006-05-22 | 2007-11-22 | Nanjing Aotecar Refrigerating Compressor Co., Ltd. | Constant Pressure Type and Fully Enclosed Scroll Compressor for Vehicle |
US20130039791A1 (en) * | 2010-04-28 | 2013-02-14 | Edwards Limited | Scroll pump |
KR101837213B1 (en) * | 2010-04-28 | 2018-03-09 | 에드워즈 리미티드 | Scroll pump |
US9097252B2 (en) * | 2010-04-28 | 2015-08-04 | Edwards Limited | Scroll pump including drive shaft extending through fixed scroll |
US9404491B2 (en) * | 2013-03-13 | 2016-08-02 | Agilent Technologies, Inc. | Scroll pump having bellows providing angular synchronization and back-up system for bellows |
US20140271305A1 (en) * | 2013-03-13 | 2014-09-18 | Agilent Technologies, Inc. | Scroll Pump Having Bellows Providing Angular Synchronization and Back-up System For Bellows |
US20160201670A1 (en) * | 2013-04-05 | 2016-07-14 | Agilent Technologies, Inc. | Angular Synchronization of Stationary and Orbiting Plate Scroll Blades in a Scroll Pump Using a Metallic Bellows |
US9328730B2 (en) | 2013-04-05 | 2016-05-03 | Agilent Technologies, Inc. | Angular synchronization of stationary and orbiting plate scroll blades in a scroll pump using a metallic bellows |
US10294939B2 (en) * | 2013-04-05 | 2019-05-21 | Agilent Technologies, Inc. | Angular synchronization of stationary and orbiting plate scroll blades in a scroll pump using a metallic bellows |
US9366255B2 (en) | 2013-12-02 | 2016-06-14 | Agilent Technologies, Inc. | Scroll vacuum pump having external axial adjustment mechanism |
US11933296B2 (en) | 2019-02-18 | 2024-03-19 | Edwards Limited | Orbital pump |
WO2021202189A1 (en) * | 2020-04-02 | 2021-10-07 | Idex Health And Science Llc | Precision volumetric pump with a bellows hermetic seal |
US12018672B2 (en) | 2020-04-02 | 2024-06-25 | Idex Health And Science Llc | Precision volumetric pump with a bellows hermetic seal |
Also Published As
Publication number | Publication date |
---|---|
JP2008523301A (en) | 2008-07-03 |
EP1825145A1 (en) | 2007-08-29 |
CN101072949A (en) | 2007-11-14 |
KR20070091136A (en) | 2007-09-07 |
WO2006061559A1 (en) | 2006-06-15 |
GB0426937D0 (en) | 2005-01-12 |
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Legal Events
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Owner name: EDWARDS LIMITED, UNITED KINGDOM Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:THE BOC GROUP PLC;BOC LIMITED;REEL/FRAME:020083/0897 Effective date: 20070531 Owner name: EDWARDS LIMITED,UNITED KINGDOM Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:THE BOC GROUP PLC;BOC LIMITED;REEL/FRAME:020083/0897 Effective date: 20070531 |
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