Oil free screw compressor
AssigneeHitachi, Ltd.
InventorsHitoshi Nishimura, Akira Suzuki
Life of this patent
Estimating the term…
Abstract
An oil free screw compressor includes a compressor main body directly connected to a high speed motor via a drive side gear and a driven side gear having a uniform speed ratio. A bearing in a side of the high speed motor employs one having the same size as that of a bearing in a side of the compressor main body. The same material as a viscous seal provided at both end portions of a male rotor and a female rotor is used for a viscous seal provided at both end portions of a motor shaft. The high speed motor is driven by a high frequency type inverter. The electric motor side and the compressor main body side are made in a rotational shaft structure which is dummy symmetrical about a uniform gear portion.
Claims21
An oil free screw compressor comprising a motor shaft to which a motor rotor is mounted, a motor casing for holding a motor stator arranged in opposite to said motor rotor, a male rotor in which a screw-like male tooth shape is formed, a female rotor in which a screw-like female tooth shape is formed, a casing for receiving the male rotor and the female rotor, and timing gears connected to the male rotor and the female rotor for synchronously rotating the male rotor and female rotor, said motor shaft and a rotational shaft of one of said male rotor and said female rotor being integral so that a rotational speed of said motor is equal to a rotational speed of at least one of said male rotor and the female rotor.
An oil free screw compressor comprising a compressor main body provided with a male rotor having a rotational shaft and a female rotor having a rotational shaft, an electric motor having a motor shaft for rotating the compressor main body, and timing gears connected to the male rotor and the female rotor for synchronously rotating the male rotor and female rotor, said motor shaft of electric motor and said rotation shaft of one of said male rotor and said female rotor being integral so that a rotational speed of said motor is equal to a rotation speed of at least one of said male rotor and the female rotor.
An oil free screw compressor comprising a motor shaft to which a motor rotor is mounted, a motor casing for holding a motor stator arranged in opposite to said motor rotor, a male rotor in which a screw-like male tooth shape is formed, a female rotor in which a screw-like female tooth shape is formed, a casing for receiving the male rotor and the female rotor, a coupling for coupling said motor shaft and said rotational shaft at least one of said male rotor and said female rotor so that a rotational speed of said motor is equal to a rotational speed of at least one of said male rotor and the female rotor, and timing gears connected to the male rotor and the female rotor for synchronously rotating the male rotor and female rotor.
An oil free screw compressor comprising a compressor main body provided with a male rotor having a rotational shaft and a female rotor having a rotational shaft, and an electric motor having a motor shaft for rotating the compressor main body, a coupling for coupling said motor shaft and said rotational shaft at least one of said male rotor and said female rotor so that a rotational speed of said motor is equal to a rotation speed of at least one of said male rotor and the female rotor, and timing gears connected to the male rotor and the female rotor for synchronously rotating the male rotor and female rotor.
Dependencies are inferred from the claim text.