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Scroll compressor reverse phase and high discharge temperature protection

  • US 5,290,154 A
  • Filed: 12/23/1992
  • Issued: 03/01/1994
  • Est. Priority Date: 12/23/1992
  • Status: Expired due to Fees
First Claim
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1. A scroll compressor comprising:

  • a shell through which a gas flows when said compressor is in operation, said shell defining a suction pressure portion and a discharge pressure portion;

    a first scroll member disposed in said shell, said first scroll member having an involute wrap and defining a discharge aperture in flow communication with said discharge pressure portion of said shell;

    a second scroll member disposed in said shell, said second scroll member having an involute wrap in interleaving engagement with the involute wrap of said first scroll member and cooperating therewith to define a plurality of compression pockets, one of said pockets being a discharge pocket which is in flow communication with said discharge aperture and out of which compressed gas flows when said compressor is in normal operation;

    means for defining a passage internal of said shell between said suction pressure portion and said discharge pocket; and

    means for permitting selective bi-directional gas flow between said discharge pocket and said suction pressure portion of said shell through said passage, said means for permitting selective bi-directional flow comprising a valve assembly, said valve assembly including a thermally responsive portion and a portion other than said thermally responsive portion, both said thermally responsive portion of said assembly and said portion of said valve assembly other than said thermally responsive portion defining at least one aperture, said assembly being operable to permit the flow of gas in a first direction and at a first rate when gas pressure in said discharge pocket is less than gas pressure in said suction pressure portion of said shell and in a direction opposite said first direction and at a second rate which is less than said first rate when discharge gas temperature exceeds a predetermined temperature.

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