制冷量是压缩机的一项重要性能指标。由于测试制冷量比较困难,一般都采用测试压缩机的排气量来进行换算。压缩机的实际制冷量Q_o=λ·q_v·V_s(λ是输气系数;q_v是压缩机的单位容积制冷量,当压缩机的运行工况确定后,q_v是一个定值;V_s是压缩机的实际排气量)。根据上式,只要测出V_s就能求出压缩机在一确定工况下的制冷量。“JB772-65中小型活塞式单级制冷压缩机试验方法”中规定,用“定容积充气试验法”测试压缩机的排气量,被测压缩机向一定容积的容器中排气,使其内压力达到某一规定值,通过测量所需的充气时间来 Refrigeration capacity is an important performance indicator of the compressor. Due to the test cooling capacity is more difficult, generally used to test the displacement of the compressor to be converted. The actual cooling capacity of the compressor Q_o = λ · q_v · V_s (λ is the gas transmission coefficient; q_v is the unit volume of the compressor refrigeration capacity, when the compressor operating conditions are determined, q_v is a constant value; V_s is the compressor Of the actual displacement). According to the above formula, as long as the measured V_s will be able to find the compressor in a determined condition of the cooling capacity. “JB772-65 small and medium piston single stage refrigerant compressor test method” provides that the “constant volume inflation test method” to test the displacement of the compressor, the compressor under test to a certain volume of container exhaust, to make it The pressure reaches a certain value, by measuring the required inflation time