Screw compressor

  • US 4,671,749 A
  • Filed: 07/03/1985
  • Issued: 06/09/1987
  • Est. Priority Date: 07/04/1984
  • Status: Expired due to Term
First Claim
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1. A screw compressor utilizing drive means for rotation of said compressor and for increasing the pressure of a fluid, said compressor comprising:

  • (a) a casing including a casing body defining therein first and second parallel cylindrical chambers axially intersected with each other and having axially opposite ends, an inlet casing member disposed at a first end of said casing body and having a casing seal member and an inlet port positioned downstream of said casing seal member for communicating with said chambers, and an exit casing member disposed at a second end of said casing body opposite said first end for closing said second end and providing an exit port communicating with said chambers;

    (b) a female screw completely axially housed within said casing body and including a first shaft operatively connected to the drive means for rotation, and a plurality of helical grooves extending substantially parallel with one another about an axis of said first shaft, said grooves being accommodated within said first chamber for rotating about said axis of the first shaft;

    (c) a male screw completely axially housed within said casing body including a second shaft operatively connected to the drive means for rotation, and a plurality of alternate helical teeth and tooth grooves substantially in parallel with one another and extending about the axis of said second shaft, said tooth grooves being accommodated within said second chamber for rotating about said axis of said second shaft, said teeth of the male screw and said grooves of the female screw being adapted to counterrotate in an intermeshing relation with each other, and wherein said inlet casing further comprises a first and second tubular seal member for sealing said first and second shafts, respectively,(d) said inlet port being positioned exclusively upstream of said female and male screw members and having a cross-sectional area equal to a combined cross-sectional area of said first and second chambers less a cross-sectional area of said first and second tubular seal members and said first and second shafts, and wherein said inlet port is positioned axially upstream of said female and male screw and has positioned therein said first and second tubular seal members, such that the fluid is allowed to flow freely into said chambers without causing a tubulent fluid flow wherein only said first and second tubular seal members and portions of said first and second shafts are positioned in said inlet port.

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