(19)
(11) EP 1 403 516 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
18.03.2009 Bulletin 2009/12

(43) Date of publication A2:
31.03.2004 Bulletin 2004/14

(21) Application number: 03021486.0

(22) Date of filing: 23.09.2003
(51) International Patent Classification (IPC): 
F04B 27/18(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT RO SE SI SK TR
Designated Extension States:
AL LT LV MK

(30) Priority: 25.09.2002 JP 2002278764

(71) Applicant: TGK CO., Ltd.
Hachioji-shi, Tokyo 193-0942 (JP)

(72) Inventor:
  • Hirota, Hisatoshi
    Hachioji-shi Tokyo 193-0942 (JP)

(74) Representative: Grünecker, Kinkeldey, Stockmair & Schwanhäusser Anwaltssozietät 
Leopoldstrasse 4
80802 München
80802 München (DE)

   


(54) Capacity control valve for variable displacement compressor


(57) A compact, low-cost capacity control valve 30 for a variable displacement compressor 1 is an integrated structure of first and at least second control valves 30A, 30B. The first control valve 30A, placed on a discharge passageway, functions as a variable orifice whose cross-sectional area can be set as desired by varying the power of a solenoid unit 30C. Part of refrigerant discharged at pressure PdH is supplied to the crank chamber 15, in which the pressure is Pc. The second control valve 30B controls the flow to the crank chamber 15 such that the differential pressure between upstream and downstream pressures PdH, PdL will be regulated at a specified level. This allows to reduce the size of the solenoid unit 30C because the first control valve 30A does not need a large force to yield a small differential pressure as required for the control operation.







Search report