Sealed Scroll Compressor for Helium

A sealed scroll compressor for helium, comprising:

• a sealed container;
• a stationary scroll being contained in the sealed container and having an end plate and a scroll wrap;
• an oil-injection port having an opening and being arranged in the end plate of the stationary scroll;
• an oil-injection mechanism having an oil-injection pipe which is arranged to pass through the sealed container and connected to the oil-injection port;
• and
• an orbiting scroll contained in the sealed container and interleaved with the stationary scroll to form an outer compression chamber and an inner compression chamber which realize an asymmetric-wrap type compression chambers;
• wherein the opening of the oil-injection port is arranged at a bottom surface of a groove between ridges formed with the scroll wrap of the stationary scroll in such a manner that a first range of an orbital angle of the orbiting scroll is approximately identical to a second range of the orbital angle of the orbiting scroll, and the oil-injection port is connected to the outer compression chamber while the orbital angle of the orbiting scroll is in the first range, and is connected to the inner compression chamber while the orbital angle of the orbiting scroll is in the second range.