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在客车空调降温装置或机械保温车的制冷装置中,采用机械压缩式制冷机时,感温自动膨胀阀(节流阀)是其中的一个很重要的组成部分,在制冷系统的设计中,确切地算出从膨胀阀流出的冷媒量,正确地定出膨胀阀的产冷量;确定吸入蒸汽的过热度和冷媒流量间的关系以及使蒸发器的产冷量与膨胀阀的产冷量相配合,都是十分必要的。例如,若膨胀阀的产冷量比蒸发器的产冷量大得多时,则感温自动膨胀阀的作用就不易稳定,亦即易使蒸发器的温度发生变化,并使吸入蒸汽的过热
In the cooling device of passenger car air-condition cooling device or mechanical warm-keeping vehicle, the temperature-sensing automatic expansion valve (throttle valve) is one of the most important components when adopting a mechanical compression refrigerator. In the design of the refrigeration system, Calculate the amount of refrigerant flowing out of the expansion valve and correctly determine the cooling capacity of the expansion valve; determine the relationship between the superheat degree of the suction steam and the refrigerant flow rate, and match the output of the evaporator with the cooling capacity of the expansion valve , Are all very necessary. For example, if the capacity of the expansion valve is much larger than that of the evaporator, then the function of the temperature-sensing automatic expansion valve is not easily stabilized, that is, the temperature of the evaporator is easily changed and the superheat of the suction steam