Scroll-type fluid apparatus provided with means for counteracting a moment exerted on orbiting scroll member

Claim 1

A scroll-type fluid apparatus comprising: a first scroll member including an end plate and spiral wraps extending upright from said end plate; a second scroll member including an end plate and spiral wraps extending upright from said end plate; said first scroll member and said second scroll member being arranged in juxtaposed relationship with the wraps thereof being fitted closely together; a rotation preventing member for preventing said second scroll member from rotating on its own axis; frame means securedly connected to said first scroll member; a crank shaft means rotatably supported by said frame means for rotation about a point coinciding with the center of said first scroll member and provided with an engaging means, said engaging means disposed at a point spaced apart from the center of its rotation by a distance corresponding to an orbit radius and for transmitting power between said scroll member and said crankshaft means; low pressure port means formed in said end plate of said first scroll member at a position near to a terminal end of said spiral wrap; high pressure port means formed in said end plate of said first scroll member in a position near to a beginning of said wrap; a plurality of pockets formed on a sliding surface of one of said first scroll member and said second scroll member for confining liquid therein, said pockets being separated from each other and located on a peripheral position of said end plate outside of the wrap; liquid supply passage means for supplying the liquid to each of said pockets; means mounted in said liquid supply passage means for restricting the outflow of the liquid from each of said pockets via said supply passage means; and a source for supplying the liquid to each of said pockets.