Patent ID: 7520737
Filing Date: 2009-04-21
Classification: F01C,F04C

Abstract:
1. A positive-displacement fluid machine constituted by a scroll compressor comprising: a housing; a drive scroll unit held rotatably in said housing; and a follower scroll unit grasped slidably by said drive scroll unit so as to be revolved relative to said drive scroll unit; wherein said drive scroll unit comprises a first drive scroll member and a drive scroll receiver; wherein said first drive scroll member comprises a rotation shaft held rotatably by said housing, a first disc-shaped end plate formed unitedly with said rotation shaft, and a plurality of drive scroll wraps formed unitedly with said first end plate, said drive scroll wraps having first and second axially opposed ends, with said first ends of said drive scroll wraps constituting base ends disposed at said first end plate and with said second ends of said drive scroll wraps constituting distal tip ends, said drive scroll wraps extending axially from said base ends thereof at said first end plate to said distal tip ends; wherein said drive scroll receiver comprises a support shaft supported rotatably by said housing, a second disc-shaped end plate formed unitedly on said support shaft and having installation grooves formed therein, said distal tip ends of said drive scroll wraps being received in said installation grooves of said second end plate; wherein said follower scroll unit comprises an outer peripheral ring portion positioned at an outer periphery of said follower scroll unit, a connection block portion positioned in a center portion of said outer peripheral ring portion, and follower scroll wraps connecting spirally between said outer peripheral ring portion and said connection block portion so as to define insertion spaces; wherein said drive scroll wraps have axially-extending side faces extending between said base ends and said distal tip ends thereof; wherein said follower scroll wraps have first and second axially opposed ends, and axially-extending side surfaces extending between said first and second axially opposed ends thereof; wherein said drive scroll wraps are respectively disposed in said insertion spaces so that said side surfaces of said drive scroll wraps and said side surfaces of said follower scroll wraps face each other, respectively, and so that compression spaces are defined between said drive scroll unit and said follower scroll unit and are reduced from an outer peripheral side toward a center side to perform compression action; wherein a clearance is formed between said side surfaces of said drive scroll wraps and said side surfaces of said follower scroll wraps; and wherein a leakage prevention mechanism is provided in said clearance, said leakage prevention mechanism comprising fibers on said side surfaces of said follower scroll wraps such that said fibers extend into said clearance.