| 摘要 |
PROBLEM TO BE SOLVED: To provide a Roots compressor capable of preventing a failure of start due to freezing of moisture collected inside of a hollow rotor. SOLUTION: Even if moisture intrudes in hollow parts 8a, 9a from a gap between axial direction end surfaces of the rotors 8, 9 and an inner wall surface of the casing 2, moisture in the hollow part 8a, 9a is made flow in a rear end direction of the hollow parts 8a, 9a in relation to rotation direction of the rotors 8, 9 by rotation of the rotors 8, 9, and is discharged to a rotor chamber 7 through communication parts 8b, 9b formed at rear end position of the hollow parts 8a, 9a. Moisture discharged into the rotor chamber 7 is discharged to outside from a delivery port 12 of a rotor chamber 7. COPYRIGHT: (C)2005,JPO&NCIPI
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