Scroll type fluid machine

Abstract

Coolling a main bearing from an inner peripheral side with the usage of cooling air flowing in a casing, and enhance heat resistance by providing a cooling air passage in a driving shaft. The driving shaft 8 rotated and driven by a motor 15 is connected to a connection part 3C of a rotating scroll 3, and the driving shaft 8 is constituted by a main shaft part 9 and a joint part 13. A cooling air passage 26 is provided in the main shaft part 9, and an auxiliary cooling air passage 27 and an inlet side opening 28 are provided in the connection part 3C. An outlet side opening 29 is provided in the joint part 13. When a cooling fan 19 is operated, the cooling air to arrows A, B, C and D directions is generated, and a fixing scroll 2, the rotating scroll 3, and an auxiliary crank 7 are cooled. At that time, a part of the cooling air is made to flow into the cooling air passages 26 and 27 as shown in arrows P and Q, thereby effectively cooling the main bearings 10 and 11 and a rotating bearing 12.

Description

technical field [0001] The present invention relates to a scroll type fluid machine suitable for use as a compressor for air, refrigerant, etc., or a vacuum pump, for example. Background technique [0002] In general, a scroll fluid machine is used as, for example, an air compressor (refer to Patent Document 1). [0003] [Patent Document 1] (Japanese) Unexamined Patent Publication No. 2005-139976 [0004] In this conventional scroll air compressor, a fixed scroll provided on a casing faces a revolving scroll rotatably arranged in the casing. The fixed volute and the revolving volute are respectively provided with scroll-shaped overlapping parts on the surface of the disc-shaped mirror plate, and are divided into a plurality of compression chambers between the overlapping parts of the respective volutes. In addition, a connecting portion connected to the driving side is protrudingly provided on the back surface of the mirror plate of the revolving scroll. [0005] In addi...

AI Technical Summary

Problems solved by technology

However, at this time, since mechanisms such as the outer diameter of each volute and the auxiliary crank are separated from the drive shaft, sufficient cooling cannot be achieved.

Therefore, in the prior art of Patent Document 2, in addition to allowing the refrigerant to flow through the drive shaft, a cooling fan for cooling the inside of the housing is required, which complicates the entire cooling structure.

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