Protection device for a high side co-rotating scroll compressor

摘要

A high side co-rotating refrigerant scroll compressor having an oil sump (64) in the discharge pressure portion (20) of its shell is protected from the abnormal conditions of high discharge pressure and reverse direction scroll rotation by a normally closed valve arrangement (74, 75) which defines a flow path that selectively opens into the suction pressure (22) or discharge pressure portion of the compressor shell dependent upon the nature of the abnormal operating condition. The valve arrangement includes a standoff portion which permits the valve arrangement and the flow path it defines to traverse the oil sump and open into the discharge pressure portion of the shell at an elevation above the level of oil in the sump.