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Supermarket refrigerated showcase high pressure and low pressure controller
author: supermarket refrigerated showcase category: commercial refrigeration Views: 516Time: 2016-08-22
supermarket refrigerated showcase high pressure and low pressure controller
high pressure pressure controller is a supermarket refrigerated showcase single pressure controller, its role is to prevent the compressor discharge pressure from being too high, generally installed in the compression The exhaust outlet of the machine.
Principle of action: high-pressure gas acts on the high-pressure bellows. When the high-pressure pressure is lower than the lower limit of the high-pressure set value, the high-pressure adjusting spring overcomes the pressure from the bellows and lifts the drive screw, and the button of the micro switch is lifted accordingly. The circuit is connected and the compressor runs normally; when the high pressure value exceeds the upper limit of the high pressure setting value, the pressure of the high pressure bellows overcomes the spring force to press down the transmission screw, press the button of the micro switch, the circuit is disconnected, and the compressor stops.
low pressure pressure controller
low pressure pressure controller also belongs to supermarket refrigerated showcase single pressure controller, its role is to prevent the compressor suction pressure is too low. It is generally installed at the suction inlet of the compressor, and its shape, structure and operating principle are similar to those of a high-pressure pressure controller. When the low pressure pressure is lower than the lower limit of the normal set value, the low pressure protector will act to stop the compressor, and it can automatically reset to start when the pressure rises. In addition, in the small supermarket refrigerated showcase refrigeration device, the method of directly controlling the suction pressure can also be used to control the parking and driving of the compressor, thereby realizing the control of the cabinet temperature.
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