| 摘要 |
PROBLEM TO BE SOLVED: To enhance operation efficiency of a compressor and reduce noises. SOLUTION: Rotor housing portions 12, 14 and 16 of a compressor housing are provided with an intake port and a discharge port for each rotor pair and with at least two additional ports selected from a group consisting of a first closed lobe port, a final closed lobe port and an economizer port 18. At least one of the additional ports communicates with a first rotor pair of the at least two rotor pairs, and the other of the additional ports communicates with a second rotor pair of the at least two rotor pairs. With this, interaction between the ports is reduced. COPYRIGHT: (C)2004,JPO
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