Patent ID: 6299417
Filing Date: 2001-10-09
Classification: F04C,F16K,Y10T

Abstract:
A back pressure structure of a scroll compressor having a fixed scroll forming a plurality of compressive chambers together with an orbiting scroll in its casing, comprising:a suction pressure space having a predetermined volume formed at one side of the fixed scroll;a suction hole formed for guiding a part of an intermediate gas filled in an intermediate pressure space filled in the rear side of the orbiting scroll to the suction pressure space by passing through the fixed scroll;a vent hole formed at the other side of the suction pressure space for guiding the intermediate pressure gas flown into the suction pressure space through the suction hole to the outermost compressive chamber which has a relatively low pressure; anda back pressure control valve elastically supported by an elastic member in the suction pressure space to open and close the suction hole, said control valve having a top covering and an edge connected to said top covering, said edge extending around the suction hole when the valve is in the closed position such that the area of the top covering to which pressure is imparted is the same whether the valve is opened or closed.