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在制冷循环中热力膨胀阀有三种基本作用:节流、调节和控制。节流:热力膨胀阀产生压力降,这是压缩制冷系统工作的基础。热力膨胀阀构成高压侧和低压侧之间(蒸发压力和冷凝压力)的分界线。调节:为了避免机械损害,对于往复压缩机很重要的是只能压缩汽态制冷剂。因此,要由热力膨胀阀调节进入蒸发器的液体制冷剂的数量,保证进入压缩机的制冷剂为蒸汽状态。控制:蒸发器的热负荷将随着工作情况而变化。热力膨胀阀根据热负荷按一定比例控制流入蒸发器的液体制冷剂。图1是典型的饱和制冷循环图,它简述了热力膨胀阀的作用。
The thermostatic expansion valve has three basic functions in the refrigeration cycle: throttling, regulation and control. Throttle: The thermal expansion valve creates a pressure drop, which is the basis for the operation of a compression refrigeration system. The thermal expansion valve forms the demarcation line between the high pressure side and the low pressure side (evaporation pressure and condensation pressure). Adjustment: In order to avoid mechanical damage, it is important for reciprocating compressors to compress only vaporous refrigerant. Therefore, by the thermostatic expansion valve to regulate the amount of liquid refrigerant into the evaporator to ensure that the refrigerant into the compressor is steam. Control: The heat load on the evaporator will vary with operating conditions. Thermal expansion valve according to the thermal load by a certain percentage of liquid refrigerant into the evaporator. Figure 1 is a typical saturated refrigeration cycle diagram, which briefly describes the role of thermal expansion valve.