Scroll compressor

Abstract

A scroll compressor, wherein the external wall curve of the spiral lap of a fixed scroll and the internal wall curve of the spiral lap of a rotary scroll are formed of an involute curve with a base circle radius 'a', the internal wall curve of the spiral lap of the fixed scroll and the external wall curve of the spiral lap of the rotary scroll are formed of an involute curve with a base circle radius 'b', and a value a / b as the ratio of the base circle radius 'a' to the base circle radius 'b' is set to more than 1.0 to less than 1.5. Since a compression chamber formed on the internal wall side of the spiral lap of the rotary scroll is compressed faster than a compression chamber formed on the external wall side of the spiral lap of the rotary scroll, leakage loss during compression can be reduced.

Description

technical field

[0001] The present invention relates to a scroll compressor, wherein a fixed scroll and an orbiting wrap whose scroll wraps rise from an end plate are engaged with each other so as to form a compression chamber therebetween, and When the shaped track rotates while the rotation is restricted by the restricting rotation mechanism, the compression chamber moves and simultaneously changes its volume, thereby performing suction, compression and discharge operations. Background technique

[0002] In such conventional scroll compressors, the two scroll wraps forming the fixed wrap and the orbiting wrap are formed by involute curves, which in many cases are involutes of circles with a constant radius.

[0003] In some scroll compressors, the thickness of part or the entire wrap wrap of the fixed wrap and the orbiting wrap changes from the center of the wrap toward the outer edge (see Patent Document 1, for example).

[0004] In some scroll compressors, a step is add...

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