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Scroll-type fluid machine with seal to aid lubrication

  • US 4,743,181 A
  • Filed: 01/16/1986
  • Issued: 05/10/1988
  • Est. Priority Date: 01/23/1985
  • Status: Expired due to Term
First Claim
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1. A scroll compressor for an air conditioning machine, the scroll compressor comprising:

  • a compressor portion having a compression chamber defined by an orbiting scroll member and a stationary scroll member housed in an upper portion of a vertical type hermetically closed cylindrical vessel, said orbiting and stationary scroll members each having a spiral wrap and being assembled together with said spiral wraps meshing with each other;

    a motor disposed in a lower portion of said hermetically closed vessel and connected to said compressor portion through a driving shaft;

    an oil sump portion formed at a bottom portion of said hermetically closed vesesl below said motor;

    oil feeding pump means provided in said driving shaft and having a suction port immersed in said oil sump;

    said hermetically closed vessel communicating with a low pressure side of a refrigerating cycle to form a low pressure chamber in said hermetically closed vessel, said compressor portion drawing a refrigerant gas into said low pressure chamber of said hermetically closed vessel, compressing the same and discharging the compressed gas out of said hermetically closed vessel;

    a first frame facing a lower surface of said orbiting scroll member;

    a sealing member disposed radially outwardly of a bearing means for coupling the driving shaft of the scroll compressor and a bearing means for supporting the driving shaft so that the bearing means are exposed to a lower pressure, said sealing member being disposed between said first frame and the lower surface of said orbiting scroll member with surfaces thereof being in slidable contact with said frame and the lower surface of said orbiting scroll member;

    a chamber provided in said hermetically closed vessel separate from said low pressure chamber by said sealing member and accommodating therein a member for preventing rotation of said orbiting scroll member about its own axis;

    a second frame having at least one bearing for supporting said driving shaft between said first frame and said motor and supporting a stator of said motor secured to said second frame; and

    a passage means provided through an end plate of said orbiting scroll member for introducing the refrigerant gas whcih is in mid course of being compressed in said compression chamber into said separated chamber from said low pressure chamber to maintain said separated chamber at an intermediate pressure between a suction pressure and a discharge pressure of said scroll compressor.

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