SCROLL COMPRESSOR

WIPO Patent Application WO/2004/029461

A1

A scroll compressor comprises a compression mechanism portion (4), a main shaft (5) for driving the compression mechanism portion (4), an electric motor (7) for driving the main shaft (5), and a journal bearing portion (20) for supporting the main shaft (5). A circular groove (21) is provided in an end portion of the journal bearing portion (20) so as to form a circular portion (22) on the internal periphery side of the circular groove (21). The ratio of the depth of the circular groove to the diameter of the main shaft is set to 0.15-0.34, and the ratio of the thickness of the circular portion structuring the circular groove to the diameter of the main shaft is set to 0.09-0.19. With the structure above, damage including wear and seizure of the journal bearing that supports the main shaft (5) can be prevented from occurring even if the main shaft (5) is deformed by a radial force derived from a compression load, so that high reliability is provided. A scroll compressor with simple structure and high efficiency, having no degradation in performance in a wide operation range is provided.

NISHIWAKI FUMITOSHI (JP)
HASEGAWA HIROSHI (JP)
OKAICHI ATSUO (JP)

PCT/JP2003/011996

April 08, 2004

September 19, 2003

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MATSUSHITA ELECTRIC IND CO LTD (JP)
NISHIWAKI FUMITOSHI (JP)
HASEGAWA HIROSHI (JP)
OKAICHI ATSUO (JP)

F04C18/02; F04C23/00; F04C29/00; (IPC1-7): F04C18/02; F04C29/00

JPS62142888A	1987-06-26
JP2001065458A	2001-03-16
JP2002031055A	2002-01-31
JP2002161856A	2002-06-07
JP2002266762A	2002-09-18
JPH11247761A	1999-09-14

Shimizu, Yoshihiro (Yashiro Building 14-4, Takadanobaba 2-chom, Shinjuku-ku Tokyo, JP)

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