Piston operated bypass valve for a screw compressor

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United States of America Patent

PATENT NO 9169840
APP PUB NO 20120247139A1
SERIAL NO

13347214

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Abstract

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A screw compressor includes a valve hole formed at a discharge side end surface of a discharge casing and at a position opening to a compression work chamber; a bypass flow path having the valve hole and a discharge chamber communicate with each other; and a valve body arranged in the valve hole. The screw compressor also includes cylinder chambers provided on a rear surface side of the valve body; a piston reciprocally moving in the cylinder chambers; a rod connecting the piston and the valve body; communication paths for introducing a fluid on a discharge side into the cylinder chamber on a side opposite to a valve body side of the piston and on the valve body side; a pressure discharge path; a plurality of valve means; and a controller controlling the plurality of valves means.

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Patent Owner(s)

Patent OwnerAddress
HITACHI-JOHNSON CONTROLS AIR CONDITIONING INCTOKYO JAPAN TOKYO METROPOLIS

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Kato, Eisuke Shizuoka, JP 10 54
Urashin, Masayuki Shizuoka, JP 13 104
Yamada, Shinichiro Yaizu, JP 92 826
Yonemoto, Ryuichiro Shizuoka, JP 7 21

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