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US 9,816,553 B2Granted
Compressor having balance mechanism for a thrust bearing
AssigneeKobe Steel, Ltd.
InventorsShugo Takaki, Yoshinori Kurioka, Masahiro Tajima, Hisanori Gotou, Norio Kawaguchi
Life of this patent
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Abstract
A screw compressor 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 each respective rotor shaft;
- a thrust bearing that is located at one shaft portion of the respective rotor shaft;
- a thrust plate that is fixed to an end of another shaft portion of the respective rotor shaft;
- a balance mechanism that reduces a thrust load acting on the thrust bearing, wherein the balance mechanism includes:
- a slide bearing comprising an element having a face that directly presses the thrust plate via a lubricant present between the face of the slide bearing and the thrust plate;
- a lubricant supply flow passage that extends to the face of the slide bearing that directly presses the thrust plate, and that supplies the lubricant to between the thrust plate and the face of the slide bearing;
- and
- a balance piston unit that presses the slide bearing toward the thrust plate by a pressure of a working fluid,
- wherein the lubricant supply flow passage has a portion extending in the interior of the slide bearing to the face of the slide bearing that directly presses the thrust plate.
7 more elements
Dependencies are inferred from the claim text.