Mitsubishi Heavy Industries Limited

Mitsubishi Heavy Industries Thermal Systems, Ltd.

Yoshiaki Miyamoto

Hajime Sato

Kosuke Nakamura

Yoshiyuki Kimata

Takuma Yamashita

Takashi Goto

Hisao Mizuno

Yasuharu Maruiwa

Masahiro Taniguchi

Taichi Tateishi

Kazuki Takahashi

Yogo Takasu

Toshiyuki Shikanai

Akihiro Noguchi

Masanari Uno

Toshiyuki Goto

Masashi Hamano

Youhei Hotta

Toshiyuki Hokazono

Shusaku Goto

Syusaku Goto

Takao Ishimoto

Akihisa Ohira

A refrigerant compressor is provided that can be assembled easily and can quickly discharge lubricating oil that leaks from contact sliding parts of its mechanical seal so as to prevent the oil from turning into sludge around the stationary ring. In a refrigerant compressor in which a mechanical seal which shaft seals the inner side and the outer side of a housing is installed at a portion of the housing through which a rotating shaft penetrates, a mechanical seal comprises a stationary ring securely fastened to the inner circumferential surface of a boss portion, a rotary ring securely fastened to the outer circumferential surface of the rotating shaft to the inside of the stationary ring so as to face the stationary ring, whereby sliding contact is formed between sides of the stationary ring and the rotary ring. The inner circumferential surface of the boss portion to the outside of the stationary ring is provided with an inclined portion over the entire circumference or at least the gravitationally lower portion of the inner circumferential surface, which enlarges from the stationary ring side toward an oil discharge hole to the outside of the stationary ring.

Refrigerant compressor

A scroll compressor (CP) in which the cylinder oil circulation rate of lubricant is optimized during the operation to improve the compression efficiency is provided. In the scroll compressor (CP) having a stepped shape, the cylinder oil circulation rate of lubricant taken into the scroll compressor (CP) and circulated together with refrigerant is set to fall within the range from 1% or more to 10% or less.

Scroll compressor having optimized cylinder oil circulation rate of lubricant

A scroll compressor performing three-dimensional compressions, which can optimize a tip clearance in operation while considering a thermal expansion and a pressure deformation and which can reduce a compression leakage to improve a compression efficiency thereby to realize a high performance. The leading end faces (and) and the bottom face of a spiral wrap () have a step portion (), and the wrap height on the outer circumference side of the spiral wrap () is made larger than that on the inner circumference side wrap height. The spiral wrap () on the inner circumference side with respect to the step portion () is stepwise or continuously made gradually lower toward the center side of the spiral wrap (), and the tip clearance (&#x394;i) of the spiral wrap on the inner circumference side with respect to the step portion () is made gradually larger toward the center side of the spiral wrap ().

Scroll compressor having a gradually changing tip clearance

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Aichi, Japan

Yoshiaki Miyamoto