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US 6,638,030 B2Granted
Oil free screw compressor
AssigneeHitachi, Ltd.
InventorsHitoshi Nishimura, Akira Suzuki
Life of this patent
Estimating the term…
Abstract
A screw compressor includes a compressor main body, a male rotor having a screw-like male tooth shape and a female rotor having a screw-like female tooth shape meshing with the screw-like male tooth shape or the male rotor. The male and female motors are provided within the compressor main body. A motor casing is operably connected to the compressor main body, and a high speed electric motor provided within the motor casing. The motor includes a motor rotor, a motor stator and a motor shaft for driving at least one of the male and female rotors. A speed ratio of the motor shaft and the at least one of the male and female rotors driven by the motor shaft is in a range of 2:1 to 1:2.
Claims17
A screw compressor comprising:
- a compressor main body;
- a male rotor having a screw-like male tooth shape and a female rotor having a screw-like female tooth shape meshing with the screw-like male tooth shape or the male rotor, the male and female rotors being provided within the compressor main body;
- a casing aligned in a longitudinal direction with and operably connected to the compressor main body;
- and
- a high speed electric motor provided within the casing, the motor comprising a motor rotor, a motor stator and a motor shaft for driving at least one of the male and female rotors;
- wherein a speed ratio of the motor shaft and the at least one of the male and female rotors driven by the motor shaft is in a range of 2:1 to 1:2.
3 more elements
A screw compressor comprising:
- a compressor main body;
- a male rotor having a screw-like male tooth shape and a female rotor having a screw-like female tooth shape meshing with the screw-like male tooth shape or the male rotor, the male and female motors being provided within the compressor main body;
- a motor casing operably connected to the compressor main body;
- a high speed electric motor provided within the motor casing, the motor comprising a motor rotor, a motor stator and a motor shaft for driving at least one of the male and female rotors;
- and
- a cooling jacket provided within the motor casing to which cooling fluid can be supplied to cool the motor;
- wherein the motor shaft and one of the male and female rotors are integral so that a rotational speed of the motor shaft is equal to the rotational speed of the one of the male and female rotors.
4 more elements
A screw compressor comprising:
- a compressor main body;
- a male rotor having a screw-like male tooth shape and a female rotor having a screw-like female tooth shape meshing with the screw-like male tooth shape or the male rotor, the male and female motors being provided within the compressor main body;
- a motor casing operably connected to the compressor main body;
- a high speed electric motor provided within the motor casing, the motor comprising a motor rotor, a motor stator and a motor shaft for driving at least one of the male and female rotors;
- a cooling jacket provided within the motor casing to which cooling fluid can be supplied to cool the motor;
- and
- timing gears connected to the male and female rotors for synchronously rotating the male and female rotors
- wherein a speed ratio of the motor shaft and the at least one of the male and female rotors driven by the motor shaft is in a range of 2:1 to 1:2.
5 more elements
A screw compressor comprising:
- a compressor main body;
- a male rotor having a screw-like male tooth shape and a female rotor having a screw-like female tooth shape meshing with the screw-like male tooth shape or the male rotor, the male and female motors being provided within the compressor main body;
- a motor casing operably connected to the compressor main body;
- a high speed electric motor provided within the motor casing, the motor comprising a motor rotor, a motor stator and a motor shaft for driving at least one of the male and female rotors;
- a cooling jacket provided within the motor casing to which cooling fluid can be supplied to cool the motor;
- and
- a high frequency inverter connected to the motor for driving the motor
- wherein a speed ratio of the motor shaft and the at least one of the male and female rotors driven by the motor shaft is in a range of 2:1 to 1:2.
5 more elements
A screw compressor comprising:
- a compressor main body;
- a male rotor having a screw-like male tooth shape and a female rotor having a screw-like female tooth shape meshing with the screw-like male tooth shape or the male rotor, the male and female motors being provided within the compressor main body;
- a motor casing operably connected to the compressor main body;
- a high speed electric motor provided within the motor casing, the motor comprising a motor rotor, a motor stator and a motor shaft for driving at least one of the male and female rotors;
- a cooling jacket provided within the motor casing to which cooling fluid can be supplied to cool the motor;
- and
- a high frequency inverter connected to the motor for driving the motor
- wherein a speed ratio of the motor shaft and the at least one of the male and female rotors driven by the motor shaft is in a range of 2:1 to 1:2.
5 more elements
Dependencies are inferred from the claim text.