supermarket refrigerated showcase » article > walk-in display coolers > The electronic expansion valve in display cooler
The electronic expansion valve in display cooler
author: supermarket refrigerated showcase category: walk-in display coolers Views: 551Time: 2016-08-22
display cooler electronic expansion valve is a kind of throttle valve in refrigeration system. The main advantage of
is that it can precisely control the refrigerant flow rate, so as to achieve the purpose of precise control of the evaporation temperature. It is usually used in places where the temperature control accuracy is relatively high. According to the different driving methods, the display cooler electronic expansion valve can be divided into electromagnetic, thermal, electric and other forms. Commonly used electromagnetic electronic expansion valve
common throttle control methods are as follows.
electronic expansion valve-suction superheat control electronic expansion valve-suction superheat control is generally used in refrigeration devices with suction superheat around 5℃. The suction superheat control system is composed of electronic expansion valve, pressure sensor, temperature sensor and controller. Operation principle: When working, the pressure sensor transmits the evaporator outlet pressure and the temperature sensor to the compressor suction superheat to the controller. After the controller processes the signal, the output command acts on the stepping motor of the electronic expansion main valve (here said The electronic expansion valve is electric), open the valve to the required position to maintain the required liquid supply of the evaporator. The stepping motor of the electronic expansion valve is based on the change of the outlet pressure of the evaporator and the change of the compressor suction superheat. The real-time output change of the power can timely overcome the main expansion valve under various working conditions and various load conditions. The variable spring force makes the opening of the valve meet the demand of the evaporator's liquid supply, and the evaporator's liquid supply can match the evaporation load in real time, that is, the electronic expansion valve can be manually set by the controller and effectively controlled. heat. In addition, it only takes a few seconds for the
display cooler electronic expansion valve to change from fully closed to fully open. The response and action speed are fast. The opening and closing characteristics and speed can be set manually: the electronic expansion valve can be in the range of 10% to 100%. Precise adjustment is made inside, and the display cooler adjustment range can be set according to the characteristics of different products.
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