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Supermarket refrigerated showcase refrigeration system safety protection and control elements
supermarket refrigerated showcase refrigeration system safety protection and control elements
refrigeration system safety protection control elements mainly include compressor high or low pressure supermarket refrigerated showcase controller, pressure difference controller, etc. , As well as safety valves, fusible plugs, emergency ammonia vents for refrigeration system auxiliary equipment and pipeline systems.
high and low pressure controller high and low pressure in the refrigeration system mainly refer to suction and discharge pressure. In the supermarket refrigerated showcase system, if the compressor discharge pressure is too high or the suction pressure is too low, it will seriously affect the normal operation of the system, and its hazards are as follows.
①Exhaust pressure is too high. If the pressure on the equipment exceeds the limit, the equipment may explode and cause a safety accident.
②The suction pressure is too low. It will not only cause the increase in power consumption of the compressor in the supermarket refrigerated showcase, resulting in a decrease in efficiency and cooling capacity, but also a decrease in the temperature of the refrigerated material and increase its dry consumption, resulting in a decrease in the quality of food. If the pressure of the system is lower than the pressure of the outside air, it will also cause the outside air and water to seep into the refrigeration system through the gap, which will affect the heat exchange of the refrigeration system or cause the ice block phenomenon of the system. Commonly used pressure controllers include high pressure pressure controller, low pressure pressure controller, high and low pressure combination controller and so on. In the refrigeration system, the pressure controller is also called pressure switch and pressure protector. It mainly introduces the gas or liquid pressure of the controlled pressure part into the bellows of the pressure controller through the pressure guiding tube, and the control switch is generated by the pressure change The displacement action. Supermarket refrigerated showcase The setting value and change range of the pressure controller are adjustable.
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