EP0502487A1 - Unité moteur-compresseur avec la culasse composée en partie de matériaux différents - Google Patents

Unité moteur-compresseur avec la culasse composée en partie de matériaux différents Download PDF

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Publication number
EP0502487A1
EP0502487A1 EP92103641A EP92103641A EP0502487A1 EP 0502487 A1 EP0502487 A1 EP 0502487A1 EP 92103641 A EP92103641 A EP 92103641A EP 92103641 A EP92103641 A EP 92103641A EP 0502487 A1 EP0502487 A1 EP 0502487A1
Authority
EP
European Patent Office
Prior art keywords
motor
cylinder head
compressor unit
portions
cylinder
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.)
Granted
Application number
EP92103641A
Other languages
German (de)
English (en)
Other versions
EP0502487B1 (fr
Inventor
Vittorio Bianchi
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.)
Whirlpool Europe BV
Original Assignee
Whirlpool Europe BV
Whirlpool International BV
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 Whirlpool Europe BV, Whirlpool International BV filed Critical Whirlpool Europe BV
Publication of EP0502487A1 publication Critical patent/EP0502487A1/fr
Application granted granted Critical
Publication of EP0502487B1 publication Critical patent/EP0502487B1/fr
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
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/12—Casings; Cylinders; Cylinder heads; Fluid connections
    • F04B39/125—Cylinder heads

Definitions

  • This invention relates to a motor-compressor unit, in particular for a refrigerator, comprising a cylinder body within which a piston moves to compress a gas, a cylinder head fixed to one end of said cylinder body, and a plate (valve plate) which is interposed between said cylinder head and body and with which usual valves are associated acting on the intake port and delivery port.
  • Cavities are provided in the cylinder head.
  • the intake cavity is positioned to correspond with the intake valve to collect the gas to be compressed within the cylinder body (or simply cylinder).
  • a further cavity is positioned to correspond with the delivery valve, to receive the compressed gas which is to be discharged from the cylinder head.
  • the cylinder head is constructed of metal (cast iron, pressed plate, aluminium), to reliably resist the mechanical stresses generated within it during gas compression and the thermal stresses deriving from the gas after its compression.
  • metal cast iron, pressed plate, aluminium
  • the high temperature of the compressed gas present in the discharge cavity is transferred by conduction through the material of the head to reach the part which defines its intake cavity.
  • An object of the invention is therefore to provide a motor-compressor unit in which the heating of the cylinder head intake cavity is reduced, so preventing excessive heating of the intake gas.
  • a further object is to provide a motor-compressor unit having a thermodynamic efficiency greater than motor-compressor units of the state of the art.
  • a further object is to provide a motor-compressor unit of the stated type which is of simple construction, low cost and reliable operation.
  • a motor-compressor unit of the aforesaid type characterised in that the cylinder head is formed of at least two mutually coupled hollow portions defining respectively at least one intake cavity and one discharge cavity, at least one of said portions being constructed of a material of low thermal conductivity.
  • the compressor is indicated overall by 1 and comprises a casing 2 comprising two half-casings 3 and 4 joined together in known manner.
  • the casing 2 contains a cylinder body 5 (or simply cylinder) within which a usual piston 6 moves, operated by a connecting rod 7 associated with a usual shaft (not shown) driven in known manner.
  • the cylinder 5 is connected in the usual manner to a stator 8, the assembly thus formed being supported by usual springs 9 (only one of which is shown) secured in known manner to the half-casing 4.
  • a cylinder head 10 is associated with one end of the cylinder 5. Between the cylinder and head 10 there is a plate 11 in which ports 12 and 13 are provided for the intake and discharge of the gas to be compressed respectively, and on which movable valves 14 and 15 (not shown in Figure 4) are positioned.
  • the plate 11 therefore acts as a valve plate and is separated from the head 10 and cylinder 11 by seal members or gaskets 16 and 17.
  • the body 18 of the cylinder head 10 is provided with holes 19 for receiving usual elements (screws) 19A for fixing the head 10 to the cylinder 5.
  • a usual gas intake duct 20 is also connected to the head 10.
  • the head 10 comprises at least two hollow portions 21 and 22 to be coupled together, a first portion 21 being constructed of metal and the second portion 22 being constructed of plastics material or in any event a material of low thermal conductivity.
  • the two portions 21 and 22 are physically separated from each other by a space 23 and comprise cavities 21A and 22A acting as the discharge and intake cavity respectively.
  • the first portion 21 comprises a flat part 25 containing the holes 19 for the elements or screws 19A for its fixing to the cylinder 5. From the part 25 there extends a raised part 26 (in which the discharge cavity 21A is formed) comprising a recess 28 to receive a projecting part or projection 29 of the second portion 22, which has a sunken part 31 from which there extends a raised part 32 provided with the projection 29. In this latter there is provided the intake cavity 22A, which is connected to other cavities 22B and 22C. The projection 29 is prolonged so that the intake cavity is positioned over the port 12 in the valve plate 11.
  • projections 33 facing the interior of said recess, and undercuts 34.
  • the projections are intended to cooperate with indentations 35 in the projection 29, whereas the undercuts 34 are intended to cooperate with shoulders 36 provided on the sides of said projection.
  • This latter also comprises further lateral hollow seats 41 and 42 intended to cooperate with feet 44 provided on the sunken part 31 (overlying this latter).
  • the cooperation between the feet 39 and 44 and the seats 40, 41 and 42 maintains the two portions 21 and 22 coupled to each other on tightening the screws 19A, and maintains the plastics portion 22 clamped against the gasket 16 and against the valve plate 5.
  • the portion 21 presses against the foot 32 and feet 44. In this manner the clamping force of the screws against said portion 21 is also transferred to the portion 22, which is pressed against the gasket 16. By this means the portion 22 is secured to the body of the cylinder 5.
  • feet 39 and 44 can deform under the action (pressing towards the plate 11) of the portion 21, ie under the clamping force of the screws in the holes 19.
  • the feet 39 and 44 deform elastically by an amount which can be previously evaluated and be chosen by the designer.
  • the relationship between deformation and elastic reaction of the material and the relationship between the elastic reaction and temperature of the material as a function of time enables the designer to determine the dimensions of the feet, the system for fixing the portion 22 onto the plate 11 and hence the dimensions of this portion and of its feet in a very reliable manner.
  • the portion 22 is constructed of a material of low thermal conductivity (ie a poor heat conductor) and as it is physically separated from the metal portion 21 (by the space 23), there is no heat passage between said portions 21 and 22.
  • Heat passage is further impeded by the presence of the usual refrigerant gas within the casing 2 of the motor-compressor unit and thus within the space 23.
  • the portion 22 acts as a silencer as it does not function as a resonance box for the sounds generated by the fluid passing through it. This may allow the silencer present in known motor-compressor units to be dispensed with, thus reducing construction time, and contributes to noise reduction.
  • a plastics muffler (indicated by 50 in Figure 4) can be provided, associated with the portion 22.
  • the motor-compressor unit is of simpler construction than known units, is of lower cost than these and is very reliable in use.
  • plastics portion 22 there are no mechanical strength problems associated with the cylinder head, as the gas present in the portion 22 is of low temperature and pressure such as not to generate within the head any stresses harmful to its mechanical integrity.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
EP19920103641 1991-03-05 1992-03-03 Unité moteur-compresseur avec la culasse composée en partie de matériaux différents Expired - Lifetime EP0502487B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000170 IT221682Z2 (it) 1991-03-05 1991-03-05 Motocompressore con testata realizzata in parti di materiali differenti
ITMI910170U 1991-03-05

Publications (2)

Publication Number Publication Date
EP0502487A1 true EP0502487A1 (fr) 1992-09-09
EP0502487B1 EP0502487B1 (fr) 1995-05-17

Family

ID=11358248

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19920103641 Expired - Lifetime EP0502487B1 (fr) 1991-03-05 1992-03-03 Unité moteur-compresseur avec la culasse composée en partie de matériaux différents

Country Status (5)

Country Link
EP (1) EP0502487B1 (fr)
AR (1) AR247442A1 (fr)
BR (1) BR9200703A (fr)
DE (1) DE69202495T2 (fr)
IT (1) IT221682Z2 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2793848A1 (fr) * 1999-01-13 2000-11-24 Toyota Motor Co Ltd Pompe a fluide
FR2800425A1 (fr) * 1999-10-27 2001-05-04 Sanden Corp Compresseur et cycle de refrigeration utilisant un tel compresseur
FR2847953A1 (fr) * 2002-11-28 2004-06-04 Zexel Valeo Compressor Europe Compresseur a piston axial, notamment compresseur a co2, pour des installations de climatisation de vehicules automobiles, avec une culasse de cylindre en plusieurs parties.
FR2925623A1 (fr) * 2007-12-21 2009-06-26 Danfoss Commercial Compressors Culasse pour compresseur frigorifique a piston, unite de compression comprenant cette culasse, et compresseur frigorifique a piston comprenant cette unite de compression

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3332259A1 (de) * 1983-09-07 1985-03-28 Danfoss A/S, Nordborg Kaeltemaschinenverdichter
EP0195486A2 (fr) * 1985-03-21 1986-09-24 Whirlpool International B.V. Ensemble moteur-compresseur hermétique pour un circuit de réfrigération
GB2199620A (en) * 1987-01-12 1988-07-13 White Consolidated Ind Inc Compressor head and suction muffler for hermetic compressor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3332259A1 (de) * 1983-09-07 1985-03-28 Danfoss A/S, Nordborg Kaeltemaschinenverdichter
EP0195486A2 (fr) * 1985-03-21 1986-09-24 Whirlpool International B.V. Ensemble moteur-compresseur hermétique pour un circuit de réfrigération
GB2199620A (en) * 1987-01-12 1988-07-13 White Consolidated Ind Inc Compressor head and suction muffler for hermetic compressor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2793848A1 (fr) * 1999-01-13 2000-11-24 Toyota Motor Co Ltd Pompe a fluide
FR2800425A1 (fr) * 1999-10-27 2001-05-04 Sanden Corp Compresseur et cycle de refrigeration utilisant un tel compresseur
FR2847953A1 (fr) * 2002-11-28 2004-06-04 Zexel Valeo Compressor Europe Compresseur a piston axial, notamment compresseur a co2, pour des installations de climatisation de vehicules automobiles, avec une culasse de cylindre en plusieurs parties.
FR2925623A1 (fr) * 2007-12-21 2009-06-26 Danfoss Commercial Compressors Culasse pour compresseur frigorifique a piston, unite de compression comprenant cette culasse, et compresseur frigorifique a piston comprenant cette unite de compression
WO2009081019A1 (fr) * 2007-12-21 2009-07-02 Danfoss Commercial Compressors Culasse pour compresseur frigorifique à piston, unité de compression comprenant cette culasse, et compresseur frigorifique à piston comprenant cette unité de compression.

Also Published As

Publication number Publication date
DE69202495T2 (de) 1996-02-01
ITMI910170U1 (it) 1992-09-05
IT221682Z2 (it) 1994-09-13
BR9200703A (pt) 1992-11-10
AR247442A1 (es) 1994-12-29
EP0502487B1 (fr) 1995-05-17
ITMI910170V0 (it) 1991-03-05
DE69202495D1 (de) 1995-06-22

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