| 摘要 |
A multi-rotor screw compressor includes a compressor housing defining at least three parallel rotor housing sections, each rotor housing section containing a rotor, and adjacent rotors defining at least two compressor pairs, the housing further including a suction port and a discharge port for each of the compressor pairs, and further including at least two additional ports selected from the group consisting of first closed lobe ports, last closed lobe ports, and economizer ports, wherein at least one of the additional ports is communicated with a first pair of the at least two pairs, and another of the additional ports is communicated with a second pair of the at least two pairs whereby interaction between the additional ports is reduced. In accordance with a further aspect of the invention, a first compressor pair is communicated with an economizer port and has a first discharge port, and a second compressor pair is not communicated with the economizer port and has a second discharge port, and the first and second discharge ports are selectively sized so as to provide the first discharge port with a lower volume index ratio (Vi) than the second discharge port. In accordance with a further aspect of the invention, a first compressor pair is communicated with an economizer port and has a first discharge port, and a second compressor pair is not communicated with the economizer port and has a second discharge port, and the first and second discharge ports are selectively sized so as to provide the first discharge port with a lower volume index ratio (Vi) than the second discharge port.
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