Positive-displacement-type refrigerant compressor with a novel oil-separating and lubricating system

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EP 0 971 128 A3

(12)	EUROPEAN PATENT APPLICATION

(88)	Date of publication A3:
	30.08.2000 Bulletin 2000/35

(43)	Date of publication A2:
	12.01.2000 Bulletin 2000/02

(21)	Application number: 99113594.8

(22)	Date of filing: 08.07.1999

(51)	International Patent Classification (IPC)⁷: F04B 39/02, F04B 27/10, F04C 29/02

(84)	Designated Contracting States:
	AT BE CH CY 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:

09.07.1998 JP 19461698
02.04.1999 JP 9644899

(71)	Applicant: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
	Aichi-ken 448-8671 (JP)

(72)	Inventors:
	Ota, Masaki, Kabushiki Kaisha Toyoda Kariya-shi, Aichi-ken, 448-8671 (JP) Umemura, Satoshi, Kabushiki Kaisha Toyoda Kariya-shi, Aichi-ken, 448-8671 (JP) Yamamoto, Shinya, Kabushiki Kaisha Toyoda Kariya-shi, Aichi-ken, 448-8671 (JP) Nakagaki, Keishi, Kabushiki Kaisha Toyoda Kariya-shi, Aichi-ken, 448-8671 (JP)

(74)	Representative: Hoeger, Stellrecht & Partner
	Uhlandstrasse 14 c 70182 Stuttgart 70182 Stuttgart (DE)

(54)	Positive-displacement-type refrigerant compressor with a novel oil-separating and lubricating system

(57) A positive-displacement refrigerant compressor has an internal oil-separating and lubricating system with an oil-separating unit (41) to separate the oil from the compressed refrigerant, an oil-storing chamber (44) an oil supply passage (61a,61b) from the oil-storing chamber to the suction system, a pressure operated valve (50) arranged in the oil supply passage, which includes a valve chamber (55a) and a movable valve spool (56) to open and close the oil supply passage. The valve spool moves in response to a change in pressure differential between compression and suction chambers and blocks the oil flow from the oil supply passage when the pressure differential is greater than the counteracting spring force (58).

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