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三十一:内平衡式和外平衡式热力膨胀阀的工作特点有何不同?各适合于何种场合使用?当使用于阀体内传动膜片下部的压力为膨胀阀节流后蒸发器入口处的压力时,这种结构的热力膨胀阀称为内平衡式。若传动膜片下部的压力为蒸发器出口处的压力,即通过外接平衡管将蒸发器出口端的压力引入传动膜片下部空间的结构,则称为外平衡式。
Thirty-one: What is the difference between the working characteristics of the internal balanced and external balanced thermal expansion valves? Which is suitable for each occasion? When the pressure used in the lower part of the transmission diaphragm in the valve body is throttled by the expansion valve, the inlet of the evaporator Of the pressure, the thermal expansion valve of this structure is called the internal balance type. If the pressure at the lower part of the transmission diaphragm is the pressure at the outlet of the evaporator, the pressure at the outlet end of the evaporator is introduced into the space below the transmission diaphragm through the external balance tube, then the structure is called external balance.