Importance

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Abstract

A gas compressor has a first chamber for receiving a low pressure refrigerant gas. A main body has a second chamber for drawing in the low pressure refrigerant gas from the first chamber and undergoing a compression operation to compress the low pressure refrigerant gas into a high pressure refrigerant gas. A third chamber receives the high pressure refrigerant gas from the second chamber. A fourth chamber receives a lubricating oil and is subjected to the pressure of the high pressure refrigerant gas from the third chamber. An oil passage has an inlet port opening into the fourth chamber and an outlet port opening into the main body. The lubricating oil from the fourth chamber is supplied to the main body through the oil passage due to a pressure difference between the third chamber and one of the first chamber and the second chamber. A pressure difference eliminating device releases the high pressure refrigerant gas from the third chamber to the first chamber upon stoppage of the compression operation in the second chamber to thereby eliminate the pressure difference between the third chamber and one of the first chamber and the second chamber.

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First Claim