Compressor for use in a transcritical refrigeration cycle system

(19)

(11)

EP 0 864 751 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	21.04.1999 Bulletin 1999/16

(43)	Date of publication A2:
	16.09.1998 Bulletin 1998/38

(21)	Application number: 98301867.2

(22)	Date of filing: 12.03.1998

(51)	International Patent Classification (IPC)⁶: F04B 39/02

(84)	Designated Contracting States:
	AT BE CH DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE
	Designated Extension States:
	AL LT LV MK RO SI

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Priority:

12.03.1997 JP 76573/97

(71)	Applicant: Zexel Corporation
	Shibuya-ku Tokyo (JP)

(72)	Inventors:
	Kanai, Hiroshi, c/o Zexel Corporation Higashimatsuyama-shi, Saitama-ken (JP) Furuya, Shunichi, c/o Zexel Corporation Higashimatsuyama-shi, Saitama-ken (JP)

(74)	Representative: Britter, Keith Palmer
	Britter & Co Barn West - Dixies High Street - Ashwell Hertfordshire SG7 5NT High Street - Ashwell Hertfordshire SG7 5NT (GB)

(54)	Compressor for use in a transcritical refrigeration cycle system

(57) A compressor (101) for use in a transcritical refrigeration cycle system, comprises a housing (4), a drive shaft (5) supported rotatably by a bearing (24) within the housing (4), a shaft seal (30, 31) interposed between the housing (4) and the drive shaft (5) so as to prevent a high-pressure fluid consisting essentially of a refrigerant and a lubricating oil from leaking from the compressor (101), and a space (40) in which are received the bearing (24) and the shaft seal (30, 31). Pressure within the space (40) is lower than the discharge pressure of the high-pressure fluid. The housing (4) is formed with a lubricating oil return passage (50) for returning lubricating oil separated from the high-pressure fluid discharged from a discharge port (3a) of the compressor (101, to the space (40).

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