Scroll compressor with controlled fluid venting

摘要

A scroll compressor is provided with a valve plate which selectively blocks communication between a tap and the back pressure chamber. The valve plate is configured such that it blocks communication during portions of the orbiting cycle and allows communication at other portions. In this way, a scroll compressor designer is able to select the portions of the compression cycle at which refrigerant is delivered to the back pressure chamber. A more consistent and stable operation of the scroll compressor can thus be achieved.