| 摘要 |
A scroll-type compressor for compressing helium gas includes stationary and orbiting scroll members each having an end plate and a spiral wrap, with the scroll members being assembled together to define compression spaces therebetween. A driven main shaft driven by has an eccentric mechanism engageable with the orbiting scroll member to cause an orbiting movement of the orbiting scroll member with respect to the stationary scroll member while preventing the orbiting scroll member to rotate about its own axis. The orbiting movement of the scroll member causes a radially inward movement of the compression spaces while progressively decreasing the volumes of the compression spaces, whereby the helium gas sucked through a suction port of the stationary scroll member is progressively compressed finally discharged from a discharge port. An oil injection system includes at least one oil injection port formed to open in the surface of the end plate of the stationary scroll member and injects an oil into the helium gas under compression in order to cool the same. The size of the oil injection port as measured in the direction of thickness of the scroll wrap is greater than the thickness of the scroll wrap of the orbiting scroll member.
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