WO2006049512A2 - Raccord de tige de piston pour compresseur lineaire - Google Patents

Raccord de tige de piston pour compresseur lineaire Download PDF

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Publication number
WO2006049512A2
WO2006049512A2 PCT/NZ2005/000289 NZ2005000289W WO2006049512A2 WO 2006049512 A2 WO2006049512 A2 WO 2006049512A2 NZ 2005000289 W NZ2005000289 W NZ 2005000289W WO 2006049512 A2 WO2006049512 A2 WO 2006049512A2
Authority
WO
WIPO (PCT)
Prior art keywords
piston
aperture
crown
piston rod
pin
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.)
Ceased
Application number
PCT/NZ2005/000289
Other languages
English (en)
Other versions
WO2006049512A3 (fr
Inventor
David Julian White
Ian Campbell Mcgill
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.)
Fisher and Paykel Appliances Ltd
Original Assignee
Fisher and Paykel Appliances 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 Fisher and Paykel Appliances Ltd filed Critical Fisher and Paykel Appliances Ltd
Publication of WO2006049512A2 publication Critical patent/WO2006049512A2/fr
Publication of WO2006049512A3 publication Critical patent/WO2006049512A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/10—Connection to driving members
    • F16J1/12—Connection to driving members with piston-rods, e.g. rigid connections
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • F04B53/144—Adaptation of piston-rods

Definitions

  • the present invention relates to linear compressors, and in particular linear compressors of the type suitable for use in a vapour compression refrigeration system.
  • Linear compressors of a type for use in a vapour compression refrigeration system are the subject of many documents in the prior art.
  • One such document is our co-pending PCT patent application PCT/NZ2004/000108. That specification describes a variety of developments relating to such compressors, many of which have particular application to the linear compressors.
  • the present invention relates to further improvements to compressor embodiments such as are described in that patent application which provides a general exemplification of a compressor to which the present invention may be applied. However the present may also be applied beyond the scope of the particular embodiments of a linear compressor disclosed in that application. Persons skilled in the art will appreciate the general application of the ideas herein to other embodiments of linear compressors such as are found in the prior art.
  • the present invention relates generally to connection of a piston rod or connecting member to the crown of a hollow piston.
  • the invention may broadly be said to consist in a linear compressor having a piston rod and a hollow piston with a cylindrical wall and an enclosing crown, the improvement comprising a connection between an end of said piston rod and said crown wherein said crown includes an aperture of a first size extending from an outer face to an inner face, said piston rod includes an axial hollow of a second size in cross-section extending into one end, said second size being similar to but not larger than said size of said aperture in said piston crown, and a pin has a shank that extends through said aperture into said hollow, with the end of said piston rod contacting said crown adjacent said aperture, said pin exhibiting a frictional engagement with at least said hollow of said piston rod and engaging said end of said piston rod to said piston crown.
  • said pin includes a flange adjacent the outer face of said piston crown, said flange being larger than said aperture and preventing said pin passing fully into said aperture.
  • the pin may have a driving fit in the aperture, or the pin may expand the piston rod end to engage features on the inner face of the piston crown. In either of these cases neither flange nor driving fit are required to retain the piston rod to the crown. However a flange may still be present to secure a valve member to the piston crown.
  • said piston crown includes features on its inner face defining one or more surrounding surfaces facing inwardly toward said aperture to collectively define a socket for the end of said piston rod, and said end of said piston rod is compressed or gripped between said shank of said pin and said inwardly facing surface or surfaces.
  • said inwardly facing surface or surfaces is defined by an inward cylindrical surface of an annular upstand wall extending from the inner face of the piston crown surrounding said aperture.
  • said end of said piston rod is divided into a plurality of fingers surrounding said hollow with said fingers gripped between said shank of said pin and said inward surfaces.
  • a planar suction valve is secured to said piston crown with a portion thereof located between a flange of said pin and the surface of said crown adjacent said aperture, said pin passing through an aperture in said valve member.
  • the invention may broadly be said to consist in a method of securing a piston to a piston rod, said piston having a piston crown with an aperture of a first size, and said piston rod having an end with a hollow of a second size, said method comprising the step of driving a pin having a shank which is of a size to have a close fit through said aperture and a driving fit into said hollow, through said aperture into said hollow until said piston crown is secured against said end of said piston rod.
  • said piston crown includes on its inner face, features having one or more surrounding surfaces facing inwardly toward said aperture to collectively define a socket, and said method includes the step of fitting said end of said piston rod into said socket of said piston crown prior to driving said pin through said aperture.
  • Figure 1 is a side elevation in cross-section of a refrigeration compressor including a linear compressor suspended in a housing.
  • Figure 2 is a cross-sectional side elevation of the relevant portion of the piston to piston rod assembly according to the preferred embodiment of the present invention.
  • Figure 3 is a side elevation of a pin or rivet according to the preferred embodiment of the present invention.
  • Figure 4 is a cross-sectional side elevation of a piston rod member according to a preferred embodiment of the present invention.
  • Figure 5 is an end elevation of the piston rod member of Figure 4.
  • Figure 6 is an end elevation of the inside of the piston crown.
  • the compressor for a vapour compression refrigeration system includes a linear compressor 1 supported inside a housing 2.
  • the housing 2 is hermetically sealed and includes a gases inlet port 3 and a compressed gases outlet port 4. Uncompressed gases flow within the interior of the housing, surrounding the compressor 1.
  • the intake to the compression space may be through the piston (with an aperture and valve in the crown) or through the head, divided to include suction and discharge manifolds and valves.
  • the illustrated linear compressor 1 has, broadly speaking, a cylinder part and a piston part connected by a main spring.
  • the cylinder part includes cylinder chassis 10, cylinder head 11, valve plate 5 and a cylinder liner 12.
  • the cylinder part also includes stator parts 15 for a linear electric motor.
  • the main spring is formed as a combination of coil spring 19 and flat spring 20.
  • the piston part includes a hollow piston 22 with sidewall 24 and crown 14.
  • a rod 26 connects between the crown 14 and a supporting body 30 for linear motor armature 17.
  • the rod has a flexible portion 28 in approximately the centre of the hollow piston 22.
  • the linear motor armature 17 comprises a body of permanent magnet material (such as ferrite or neodymium) magnetised to provide one or more poles directed transverse to the axis of reciprocation of the piston within the cylinder liner.
  • An end portion 32 of armature support 30 which is distal from the piston 22 is connected with the main spring 19, 20.
  • the linear compressor 1 is mounted within the shell 2 on a plurality of suspension springs to isolate it from the shell.
  • the cylinder part In use the large outer body of the linear compressor, the cylinder part, will oscillate along the axis of reciprocation of the piston part within the cylinder part.
  • the piston part In the preferred compressor the piston part is purposely kept very light compared to the cylinder part so that the oscillation of the cylinder part is small compared with the relative reciprocation between the piston part and cylinder part.
  • Li the illustrated form the linear compressor is mounted on a set of four suspension springs 31 generally positioned around the periphery. Alternate suspension spring arrangements are illustrated in PCT/NZ2004/000108. The ends of each suspension spring fit over elastomeric snubbers connected with the linear compressor 1 at one end of each spring and connected with the compressor shell 2 at the other end of each spring.
  • the piston crown includes a small central aperture 42.
  • the piston rod 26 includes a central hollow 44 extending in from one end.
  • a rivet or pin 45 has a shank 46 that preferably has a transition fit through the aperture 42 and a driving fit within the hollow 44.
  • the pin 45 is driven through the aperture 42 to engage in the hollow 44 and hold the piston crown 14 to the piston rod 26.
  • the pin 45 has a head 47 with an outward flange to engage on the outer face of piston crown 14.
  • the flange may also retain a planar valve member 52 against the outer surface of the piston crown.
  • the shank 46 of the pin 45 may be also a driving fit within aperture 42 and/or may cause the end of piston rod 26 to expand and engage features on the inner side of piston crown 14.
  • annular upstand wall 48 protrudes from the inner side of the piston crown 14, defining an inwardly facing cylindrical surface surrounding the aperture 42.
  • the outer surface of the end of the piston rod 26 is an interference fit within this annular wall 48.
  • the piston rod may be terminated with a slight chamfer to aid pushing the piston rod end into this socket.
  • the piston rod end is formed, around said hollow 44, as a plurality of fingers, for example by two or more longitudinal slots 50. With the pin 46 driven into the hollow 44 the fingers are splayed apart so that the outer surface of the fingers engages against the inner surface of the annular wall 48.
  • a friction force created between the rivet and the rod and between the rod and the socket is significantly greater than the rivet insertion force or the piston insertion force into the socket. It is intended that the pin is a "heavy drive" fit into the hollow end of the piston rod, requiring, for example, a 200N drive force to insert a pin approximately 10mm long with a 2mm shank diameter. Additional security of the joint can be achieved by applying adhesives before assembly.
  • a suitable adhesive may include epoxy or cyanoacrylate for example.
  • the piston will be constructed with a sintered steel crown and a steel tube cylindrical wall, the two components being brazed or welded together.
  • the piston rod and the connecting pin may both be formed of suitable steel alloys.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Compressor (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

Cette invention concerne un compresseur linéaire comprenant une tige de piston et un piston creux avec une paroi cylindrique et une couronne. Un raccord entre l'extrémité de la tige de piston et la couronne comporte une ouverture ménagée dans la couronne du piston et s'étendant depuis une face externe jusqu'à une face interne. La tige de piston présente un creux axial s'étendant jusque dans l'une des extrémités. Ce creux est d'une taille similaire et non supérieure à la taille de l'ouverture ménagée dans la couronne du piston. Une broche comporte une tige qui s'étend à travers l'ouverture jusque dans le creux. L'extrémité de la tige de piston est en contact avec la couronne à proximité adjacente de l'ouverture. La broche coopère par friction avec le creux de la tige de piston, de façon à mettre en prise l'extrémité de la tige de piston avec la couronne du piston.
PCT/NZ2005/000289 2004-11-02 2005-11-01 Raccord de tige de piston pour compresseur lineaire Ceased WO2006049512A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US62442504P 2004-11-02 2004-11-02
US60/624,425 2004-11-02

Publications (2)

Publication Number Publication Date
WO2006049512A2 true WO2006049512A2 (fr) 2006-05-11
WO2006049512A3 WO2006049512A3 (fr) 2006-06-01

Family

ID=36319575

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NZ2005/000289 Ceased WO2006049512A2 (fr) 2004-11-02 2005-11-01 Raccord de tige de piston pour compresseur lineaire

Country Status (1)

Country Link
WO (1) WO2006049512A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2563873C2 (ru) * 2013-12-30 2015-09-27 Общество с ограниченной ответственностью "Краснодарский Компрессорный Завод" Шток составного дифференциального поршня
US11885325B2 (en) 2020-11-12 2024-01-30 Haier Us Appliance Solutions, Inc. Valve assembly for a reciprocating compressor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0088952B1 (fr) * 1982-03-05 1986-05-28 Feldmühle Aktiengesellschaft Pièce de déplacement pour une pompe avec piston
DE3218320A1 (de) * 1982-05-14 1983-11-17 Ficht GmbH, 8011 Kirchseeon Vorrichtung zum loesbaren befestigen der kolben an den kolbenstangen einer brennkraftmaschine
DE3734547A1 (de) * 1987-10-13 1989-05-03 Festo Kg Kolben-zylinder-aggregat
US5080565A (en) * 1991-01-04 1992-01-14 Tecumseh Products Company Retainer for piston head subassembly and method of retaining piston head subassembly
DE19649247A1 (de) * 1996-11-28 1998-01-29 Mannesmann Sachs Ag Kolbenstange mit wenigstens einem Anschlußzapfen
US6273688B1 (en) * 1998-10-13 2001-08-14 Matsushita Electric Industrial Co., Ltd. Linear compressor
US6216647B1 (en) * 1999-02-22 2001-04-17 Caterpillar Inc. Free piston internal combustion engine with piston head having non-metallic bearing surface

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2563873C2 (ru) * 2013-12-30 2015-09-27 Общество с ограниченной ответственностью "Краснодарский Компрессорный Завод" Шток составного дифференциального поршня
US11885325B2 (en) 2020-11-12 2024-01-30 Haier Us Appliance Solutions, Inc. Valve assembly for a reciprocating compressor

Also Published As

Publication number Publication date
WO2006049512A3 (fr) 2006-06-01

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