活塞式膨胀机制取冷量的多少,除与高压P1、进气温度T1有关外,还与进气量有关。而进气量的多少直接与进、排气阀的调整有关。为了提高制冷能力,减少冷量损失,活塞式膨胀机的设计和调整都不能忽视进、排气提前角。一般需有8°~10°进气提前角,5°~8°排气提前角。我单位所购的活塞式膨胀机,按照其说明书,“进、排气阀门调整阀杆与顶杆之间的间隙的方法为:①调进气阀时将活塞放在上死点,调排气阀时将活塞放在下死点;②产 Piston expansion mechanism to take the amount of cold, in addition to the high pressure P1, intake temperature T1, but also with the intake volume. The amount of intake air directly into and exhaust valve adjustment. In order to improve the cooling capacity, reduce the loss of cold, piston expander design and adjustment can not ignore the advance and exhaust advance. Generally require 8 ° ~ 10 ° intake advance angle, 5 ° ~ 8 ° exhaust advance angle. Piston expander purchased by our unit, according to its instructions, "into the exhaust valve to adjust the gap between the stem and ejector method is: ① when the valve into the air valve will be placed on the top dead center, scheduling Piston valve on the bottom dead center; ② production