EP0479443A1 - Compresseurs pour appareil de réfrigération - Google Patents

Compresseurs pour appareil de réfrigération Download PDF

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Publication number
EP0479443A1
EP0479443A1 EP91308395A EP91308395A EP0479443A1 EP 0479443 A1 EP0479443 A1 EP 0479443A1 EP 91308395 A EP91308395 A EP 91308395A EP 91308395 A EP91308395 A EP 91308395A EP 0479443 A1 EP0479443 A1 EP 0479443A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
piston
housing
compressor
resilient elements
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Withdrawn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
EP91308395A
Other languages
German (de)
English (en)
Inventor
Denis Martin O'shea
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.)
ZF International UK Ltd
Original Assignee
Lucas Industries 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 Lucas Industries Ltd filed Critical Lucas Industries Ltd
Publication of EP0479443A1 publication Critical patent/EP0479443A1/fr
Withdrawn legal-status Critical Current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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F04B35/045—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids

Definitions

  • This invention relates to compressors for refrigeration apparatus, and in particular to compressors for cryogenic refrigerators.
  • Refrigerator compressors are typically piston and cylinder devices and in compressors for small refrigerators it is known to cause reciprocation between the piston and cylinder by means of a linear motor.
  • the piston and cylinder require to have a very small running clearance, and this requirement is particularly true of cryogenic refrigerators in which the working fluid is commonly helium.
  • a seal between the piston and cylinder is provided by ceramic surfaces on these parts, and the cylinder forms part of a moving armature which is supported on the piston. The rubbing surfaces are therefore subject to wear and increased clearance, and consequent leakage of refrigerant fluid.
  • the piston shall be of a hard material and that the cylinder shall have a relatively soft antifriction lining such as PTFE.
  • the piston is supported within the cylinder so as theoretically to remain concentric therewith.
  • a compressor for a refrigeration apparatus comprising a housing containing a piston which is integral with the housing, a cylinder and an electromagnetic linear motor for effecting reciprocating motion between the piston and cylinder, a stationary element of the motor being secured within the housing, and the cylinder being mounted in the housing by means of radially stiff, axially flexible resilient elements whose radially outer and inner portions are secured directly to the stationary element and the cylinder respectively.
  • Figure 1 is a longitudinal section through a compresssor for a Stirling type cryogenic refrigerator and Figure 2 is an end view of a spring component of Figure 1.
  • An annular permanent magnet 10 is mounted in annular yoke 11 one end 12 of which defines a magnetic pole having a first polarity.
  • An annular pole piece 13 is secured to the magnet and has a second polarity.
  • the gap between the poles 12,13 is occupied by an annular coil 14 which is mounted on the periphery of a non-magnetic carrier 15.
  • the carrier 15 extends radially from a cylinder element 24 which has a blind bore 16 and annular end faces 17,18.
  • the carrier 15 is supported within the yoke 11 by two spring assemblies 19,20 which are radially stiff and axially flexible.
  • the assemblies 19,20 are secured at their radially inner ends to the faces 17, 18 respectively, and at their outer ends to respective opposite end faces 21,22 of the yoke 11.
  • the yoke 11 and carrier 15 are machined so that the distance between the end faces 17,18 is equal to that between the faces 21,22.
  • the assemblies 19,20 each comprise a stack of flat spiral springs 30 which are separated from each other at their peripheries and their radially inner ends by circular spacers 35.
  • each spring 30 comprises a thin metal disc of resilient material, formed with slits 31 which define a multistart spiral. Twelve equi-spaced holes 32 at each of the peripheries and inner circumferences enable the discs 30 and spacers 35 to be secured together and the resulting assemblies 19,20 to be secured by bolts 33 (Fig.1) to the carrier 15, and to the yoke 11 by bolts 34.
  • the bolts 34 also secure the yoke 11 to a housing part 40 in which is mounted one element of a variable displacement transducer 41. The other element of the transducer is secured to the carrier 15. It will be seen that the peripheries of the assemblies 19,20 lie closely adjacent the wall of the housing part 40.
  • the cylinder 24 cooperates with a piston 42 formed integrally with a further housing part 43 to define a volume 44 within which a refrigerant can be compressed.
  • An axial passage 45 in the piston 42 communicates with the volume 44 and with an outlet 46.
  • the housing part 40, the magnet 10, yoke 11 and pole piece 13 may be assembled concentrically with the carrier 15 using a suitable jig which has a part equivalent to the piston 42.
  • the required high accuracy of concentric assembly is rendered more readily achievable than in the prior art by virtue of the relatively few components involved.
  • the yoke 11 and carrier 15 are machined so that the axial distance between the faces 17,18 is as close to the distance between that of the faces 21,22 as is readily obtainable.
  • the bolts 33,34 may therefore be tightened down without introducing any stress which will result in misalignment when the jig, or the part thereof which includes the equivalent to the piston 42, is removed.
  • the housing part 43 may therefore be located with respect to the part 40, using the same or a further jig, to locate the piston 42 concentrically within the bore 16 with the necessary clearance.
  • the housing parts 40,43 are secured together by electron beam welding.
  • the absence of pre-stressing of the assemblies 19,20 also has the effect that the bore 16 will remain concentric with the piston 42 during reciprocation of the former.
  • the diameters of the discs 30 are considerably increased and permit the use of substantial bolts 33,34, which provide an improved clamping load.
  • the described construction also permits the piston 42 to have a greater axial dimension than is possible with prior art arrangements. The clearance between the piston 42 and the bore 16 may thereby be increased without increasing leakage flow through that clearance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
EP91308395A 1990-10-04 1991-09-13 Compresseurs pour appareil de réfrigération Withdrawn EP0479443A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB909021568A GB9021568D0 (en) 1990-10-04 1990-10-04 Compressors for refrigeration apparatus
GB9021568 1990-10-04

Publications (1)

Publication Number Publication Date
EP0479443A1 true EP0479443A1 (fr) 1992-04-08

Family

ID=10683216

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91308395A Withdrawn EP0479443A1 (fr) 1990-10-04 1991-09-13 Compresseurs pour appareil de réfrigération

Country Status (3)

Country Link
EP (1) EP0479443A1 (fr)
JP (1) JPH04298689A (fr)
GB (1) GB9021568D0 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998001674A1 (fr) * 1996-07-08 1998-01-15 Isis Innovation Limited Moteur a compresseur lineaire
EP1045145A1 (fr) * 1999-04-16 2000-10-18 Litton Systems, Inc. Moteur linéaire actionné électriquement avec ressort et circuit intégrés pour utilisation dans un compresseur alternatif
SG107550A1 (en) * 1997-10-15 2004-12-29 Matsushita Refrigeration Improved structure of vibrating compressors
DE10241404B4 (de) * 2001-11-05 2013-01-10 Lg Electronics Inc. Kolbenverdichter
US9605666B2 (en) 2000-10-17 2017-03-28 Fisher & Paykel Appliances Limited Linear compressor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101454550B1 (ko) * 2013-06-28 2014-10-27 엘지전자 주식회사 리니어 압축기

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1069802A (fr) * 1952-01-10 1954-07-13 Roulements A Billes Miniatures Pompe à piston à faible course
GB2062773A (en) * 1979-10-29 1981-05-28 Davey G Improvements In or Relating to Compressors and Refrigeration Plant
WO1989003481A1 (fr) * 1987-10-08 1989-04-20 Helix Technology Corporation Moteur d'entrainement lineaire a amortisseur dynamique ameliore
WO1990012961A1 (fr) * 1989-04-21 1990-11-01 Isis Innovation Limited Machine a cycle de stirling et compresseur utilise dans une telle machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1069802A (fr) * 1952-01-10 1954-07-13 Roulements A Billes Miniatures Pompe à piston à faible course
GB2062773A (en) * 1979-10-29 1981-05-28 Davey G Improvements In or Relating to Compressors and Refrigeration Plant
WO1989003481A1 (fr) * 1987-10-08 1989-04-20 Helix Technology Corporation Moteur d'entrainement lineaire a amortisseur dynamique ameliore
WO1990012961A1 (fr) * 1989-04-21 1990-11-01 Isis Innovation Limited Machine a cycle de stirling et compresseur utilise dans une telle machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998001674A1 (fr) * 1996-07-08 1998-01-15 Isis Innovation Limited Moteur a compresseur lineaire
US6127750A (en) * 1996-07-08 2000-10-03 Isis Innovation Limited Linear compressor motor
SG107550A1 (en) * 1997-10-15 2004-12-29 Matsushita Refrigeration Improved structure of vibrating compressors
EP1045145A1 (fr) * 1999-04-16 2000-10-18 Litton Systems, Inc. Moteur linéaire actionné électriquement avec ressort et circuit intégrés pour utilisation dans un compresseur alternatif
US9605666B2 (en) 2000-10-17 2017-03-28 Fisher & Paykel Appliances Limited Linear compressor
DE10241404B4 (de) * 2001-11-05 2013-01-10 Lg Electronics Inc. Kolbenverdichter

Also Published As

Publication number Publication date
JPH04298689A (ja) 1992-10-22
GB9021568D0 (en) 1990-11-21

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