The role of pressure relays in refrigeration systems

In large and medium-sized installations, because the compressor starting current is large, so many low-voltage relays are not used to automatically start the compressor, so it only serves as a low-voltage protection. In industrial refrigeration, the pressure relay is a kind of electricity controlled by a pressure signal. The switch is often used as a protection and regulating component to directly control the start and stop of the refrigeration compressor or to control the opening and closing of some solenoid valves. Shandong cold storage price pressure relays used in refrigeration units are classified into low-voltage relays and high-voltage relays according to their pressure control ranges.

There are also two types of relays assembled in one housing and sharing one electrical contact to form a combined high and low voltage relay.

The refrigeration compressor is often equipped with a low-voltage relay that directly controls the starting circuit. It uses the compressor suction pressure as the action signal, and its function is:

1) When the suction pressure is too low, the compressor will be automatically stopped to prevent air from leaking into the system from the pipeline or shaft seal, and it will play a role of low pressure protection. Shandong cold storage installation

2) In the small refrigeration device, in addition to the low-pressure protection, the compressor can be automatically started and stopped according to the set suction pressure to keep the temperature of the cold storage stable and to adjust the temperature of the storage.

In the large and medium-sized devices, since the starting current of the compressor is large, the low-voltage relay is not used to automatically start the compressor, so it only serves as a low-voltage protection book. Small cold storage price



In addition, some piston compressors are equipped with a low-voltage relay that controls the electromagnetic automatic adjustment system. It can increase or decrease the number of working cylinders of the compressor according to the change of the suction pressure of the compressor. The evaporation temperature remains stable. Low voltage relays can also be used as low voltage protection devices for other devices in the installation. Built cold storage price

This article is organized by Shandong Dingsheng Refrigeration Equipment Co., Ltd.! If you have any enquiries, please pay attention to the WeChat public account "Dingsheng Refrigeration" or call 15725158383! ! !
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn

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