| 摘要 |
PROBLEM TO BE SOLVED: To flow drain out from a back pressure chamber to prevent generation of rust or corrosion and thereby to improve reliability and service life. SOLUTION: To an end plate 12A of a swirl scroll main body 12 constituting a swirl scroll 11, a high pressure side back pressure hole 23 is formed at a position capable of communicating with a high pressure chamber 14, and a low pressure side back pressure hole 24 is formed at a position capable of communicating with a low pressure chamber 14 lower in pressure than the high pressure compression chamber 14. In compression operation, by differential pressureΔP between the high pressure side back pressure hole 23 and the low pressure side back pressure hole 24, compressed air including the drain flowing in the back pressure chamber 22 can flow to the low pressure side back pressure hole 24, and can flow out to the compression chamber 14 from the low pressure back pressure hole 24 together with the drain. Therefore, generation of rust or corrosion is prevented. COPYRIGHT: (C)2009,JPO&INPIT
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