Scroll compressor with back pressure hole relief

摘要

A scroll compressor has a recess communicating with a back pressure hole leading to a back pressure chamber. The recess may be formed in either the rear face of the orbiting scroll, or in the mating face of the crankcase. Preferably, the recess surrounds the orbiting axis of the orbiting scroll compressor, and may be circular. The recess serves to quickly supply fluid from the back pressure hole to the back pressure chamber. This is particularly valuable at startup of the scroll compressor. With the inventive recess, a test to determine whether the scroll compressor is capable of reaching its operative pressures may be performed more quickly and more accurately. The recess is preferably relatively shallow, and is preferably of a depth which is less than the diameter of the back pressure hole.