Sealed Scroll Compressor for Helium

Abstract

A sealed scroll compressor for helium having a stationary scroll, an orbiting scroll, and an oil-injection mechanism. The oil-injection mechanism has an oil-injection pipe arranged to pass through a sealed container and connected to an oil-injection port, and 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 the orbital angle of the orbiting scroll is approximately identical to a second range of the orbital angle of the orbiting scroll, where 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.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the foreign priority benefit under 35 U.S.C. §119 of Japanese Patent Application No. 2011-110004, filed on May 17, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a sealed scroll compressor for use in refrigeration or air conditioning, and in particular to a sealed scroll compressor for helium.[0004]2. Description of the Related Art[0005]An example of a sealed scroll compressor for helium is disclosed in Japanese Patent Laid-open No. 2009-156234 (hereinafter referred to as JP2009-156234A).[0006]The sealed scroll compressor disclosed in JP2009-156234A has an oil-injection mechanism, in which an oil-injection pipe for cooling the working helium gas is arranged through the wall of a sealed container and is connected to an oil-injection port arranged in an end plate of the stationary scroll. However, the flow ra...

AI Technical Summary

Benefits of technology

[0010]According to the present invention, the performance of the compressor is improved.

Problems solved by technology

However, the flow rate of the first injected cooling oil into the outer compression chamber on the outer side of the scroll and the flow rate of the second injected cooling oil into the inner compression chamber on the inner side of the scroll are unbalanced, where the outer compression chamber is formed between the outer curved surface of the orbiting scroll (orbital scroll) and the inner curved surface of the stationary scroll, and the inner compression chamber is formed between the inner curved surface of the orbiting scroll and the outer curved surface of the stationary scroll.

The increase in the pressure difference (ΔPI) between the compression chambers can increase the internal leakage.

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