Screw compressor

  • US 10,947,976 B2
  • Filed: 11/15/2016
  • Issued: 03/16/2021
  • Est. Priority Date: 12/17/2015
  • Status: Active Grant
First Claim
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1. A screw compressor comprising:

  • a first-stage compressor main body and a second-stage compressor main body respectively configured to compress fluid with screw rotors;

    an electric motor configured to drive the first-stage compressor main body and the second-stage compressor main body; and

    a gear box connected to the first-stage compressor main body, the second-stage compressor main body, and the electric motor, and configured to transmit a driving force of the electric motor to the screw rotors of the first-stage and second-stage compressor bodies, the gear box including a first attachment hole for attaching the first-stage compressor main body and a second attachment hole for attaching the second-stage compressor main body, and being provided with an annular rib surrounding an entire contour of the first attachment hole and an entire contour of the second attachment hole,wherein the annular rib includes;

    a first rib region being a portion provided around the first attachment hole,a second rib region being a portion provided around the second attachment hole, anda third rib region being a region between the first rib region and the second rib region,wherein a maximum space in a vertical direction between an upper portion and a lower portion of a first rib portion constituting the first rib region is a first space,wherein a maximum space in a vertical direction between an upper portion and a lower portion of a second rib portion constituting the second rib region is a second space,wherein a maximum space in a vertical direction between an upper portion and a lower portion of a third rib portion constituting the third rib region is a third space,wherein the third space is not more than the first space and not more than the second space,wherein a central upper rib being a rib on an upper side of the third rib portion is arranged above an imaginary center line connecting a center of the first attachment hole and a center of the second attachment hole, andwherein a central lower rib being a rib on a lower side of the third rib portion is arranged below the imaginary center line, andwherein the screw compressor further comprises, between the central upper rib and the central lower rib, an additional rib portion extending along the central upper rib or the central lower rib, or extending along the central lower rib within a range of an angle formed between the central upper rib and the central lower rib.

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