Compressor
AssigneeKabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.)
InventorsShugo TAKAKI, Yoshinori KURIOKA, Masahiro TAJIMA, Hisanori GOTOU, Norio KAWAGUCHI
Life of this patent
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Abstract
In order to adapt a balance piston unit of a compressor to a high speed, and to extend a service life of the compressor, a screw compressor according to the present invention includes a screw rotor including a rotor shaft, a radial bearing, a thrust plate, a balance mechanism, which is a slide bearing, a lubrication oil supply flow passage for supplying a lubrication oil, and a working fluid supply flow passage for supplying a working fluid for pressing the balance mechanism toward the thrust plate so that a reverse thrust load acts on the thrust plate.
Claims7
A compressor comprising:
- a screw rotor that includes a rotor main unit, which is a screw, and rotor shafts which extend from both sides of the rotor main unit;
- radial bearings that are located on both sides of the rotor main unit, and receive a radial load of the rotor shaft;
- a thrust bearing that is located at one shaft portion of the rotor shaft;
- a thrust plate that is fixed to an end of the other shaft portion of the rotor shaft;
- a balance mechanism that reduces a thrust load acting on the thrust bearing,
- wherein the balance mechanism includes:
- a slide bearing that presses the thrust plate via a lubricant between the slide bearing and the thrust plate;
- and
- a balance piston unit that presses the slide bearing toward the thrust plate by a pressure of a working fluid.
Dependencies are inferred from the claim text.