在冷库制冷系统中，蒸发器、冷凝器、冷库压缩机和节流阀，是制冷系统中必不可少的四大件，这当中蒸发器是输送冷量的设备，制冷剂在蒸发器中吸收被冷却物体的热量实现制冷。

In the cold storage refrigeration system, evaporators, condensers, refrigerators and throttle valves are four essential parts of refrigeration system. Evaporators are devices that transmit cold quantities. Refrigerants absorb heat from cooled objects to achieve refrigeration in evaporators.

在冷库内，按照制冷原理将制冷压缩机、制冷设备、阀门及控制器等用无缝钢管连接成完整的制冷装置，形成一个封闭系统。在制冷压缩机的作用下，使制冷剂在系统内发生相变(蒸发吸热)而不断循环，以冷间及食品温度达到制冷的目的。而这个系统就是冷库的制冷系统。

In the cold storage, according to the refrigeration principle, the refrigeration compressor, refrigeration equipment, valves and controllers are connected into seamless refrigerating devices by seamless steel tubes, forming a closed system. Under the action of refrigeration compressor, the refrigerant will undergo phase change (evaporation and heat absorption) in the system, and it will circulate continuously, so that the cooling room and food temperature will achieve the purpose of refrigeration. And this system is the refrigeration system of the cold storage.

节流阀对制冷剂起节流降压作用、同时控制和调节流入蒸发器中制冷剂液体的数量，并将系统分为高压侧和低压侧两大部分。

The throttle valve throttled and throttled the refrigerant, controlled and regulated the amount of refrigerant liquid flowing into the evaporator, and divided the system into two parts: the high side and the low side.

冷凝器是放出热量的设备，将蒸发器中吸收的热量连同压缩机功所转化的热量一起传递给冷却介质带走。

The condenser is the equipment to release the heat, which passes the heat absorbed in the evaporator together with the heat transferred from the compressor work to the cooling medium.

实际冷库制冷系统中，除上述四大件之外，还有一些辅助设备，如电磁阀、分配器、干燥器、集热器、易熔塞、压力控制器等部件组成，它们是为了提高运行的经济性，可靠性和安全性而设置的。

The cold storage refrigeration system, in addition to the above four parts, there are some auxiliary equipment, such as solenoid valves, dispensers, dryers, heat collector, fusible plug, pressure controller and other components, they are in order to improve the economic operation, reliability and safety setting.

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