Scroll fluid machine

Abstract

The scroll-type compressor comprises a fixed scroll 320 and an orbiting scroll which are engaged with each other, a front housing 220 for accommodating the fixed scroll 320 and the orbiting scroll, and a rear housing 240 joined to the open end of the front housing 220. The fixed scroll 320 has the base plate 322 fitted into the front housing 220, and the flange 326 held at a joint surface between the front housing 220 and the rear housing 240. Additionally, at least one of the flange 326 of the fixed scroll 320 and the front housing 220 forms therein a recessed portion 326A or 220E which permits the fixed scroll 320 to be displaced in an axial direction toward the orbiting scroll due to a pressure difference acting on opposite surfaces of the base plate 322 of the fixed scroll 320.

Dependencies are inferred from the claim text.