(19)
(11) EP 1 666 817 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.01.2007 Bulletin 2007/03

(43) Date of publication A2:
07.06.2006 Bulletin 2006/23

(21) Application number: 05026063.7

(22) Date of filing: 30.11.2005
(51) International Patent Classification (IPC): 
F25B 41/06(2006.01)
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
Designated Extension States:
AL BA HR MK YU

(30) Priority: 01.12.2004 JP 2004348850
01.12.2004 JP 2004348889

(71) Applicants:
  • Fujikoki Corporation
    Tokyo 158-0082 (JP)
  • DENSO CORPORATION
    Kariya-shi Aichi 448-8661 (JP)

(72) Inventors:
  • Ise, Sadatake
    Setagaya-ku Tokyo 150-0082 (JP)
  • Yanagisawa, Shu
    Setagaya-ku Tokyo 150-0082 (JP)

(74) Representative: Gleiss, Alf-Olav et al
Gleiss Grosse Schrell & Partner Patentanwälte Rechtsanwälte Leitzstrasse 45
70469 Stuttgart
70469 Stuttgart (DE)

   


(54) Pressure control valve


(57) A pressure control valve to be integrated into a steam-compression type refrigerating cycle (100) comprising a compressor (101) for circulating CO2 employed as a refrigerant, a gas cooler (102) for cooling the refrigerant compressed by the compressor, an evaporator (104) into which the refrigerant is designed to be introduced from the gas cooler, and an internal heat exchanger (103) for performing heat exchange between the refrigerant on the outlet side of the evaporator and the refrigerant on the outlet side of the gas cooler; the pressure control valve being constructed to pass the refrigerant to the evaporator after adjusting, depending on the temperature of the refrigerant on the outlet side of the gas cooler, the pressure of the refrigerant introduced therein via the internal heat exchanger from the gas cooler. This pressure control valve comprises: a temperature-sensing cylinder (30) for sensing the temperature of refrigerant on the outlet side of the gas cooler; a temperature-sensing pressure responding element (20) which is provided with a temperature-sensing chamber (25) communicated through a capillary tube (32) with the temperature-sensing cylinder and designed to drive a valve body (15) into a closed or open state in response to fluctuations of inner pressure of the temperature-sensing chamber; and a valve main body (10A) attached integrally to the pressure responding element; wherein the temperature-sensing cylinder and the temperature-sensing chamber are filled with CO2 at a predetermined density and also with a bulking quantity of an inert gas, thereby enabling to adjust the pressure of refrigerant on the outlet side of the gas cooler in order to secure a maximum coefficient of performance relative to the temperature of refrigerant on the outlet side of the gas cooler.







Search report