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Supermarket display cases What are the safety protection originals of the refrigeration system
author: supermarket refrigerated showcase category: walk-in display coolers Views: 515Time: 2016-08-22
display cases Safety protection of the refrigeration system
Supermarket display cases Protective components: high and low pressure controller 19, oil pressure difference controller 18, thermal relay, water solenoid valve, transistor level relay .
(1) Principle of high and low pressure protection: When the high pressure of the system exceeds the upper limit of the safety pressure setting value, or the low pressure pressure is lower than the lower limit of the safety pressure setting value, the high pressure control or low pressure controller will act to stop the compressor , So as not to affect the normal operation of the refrigeration system of display cases due to abnormal pressure. Until the pressure returns to normal, control the compressor to drive again.
(2) Principle of oil pressure protection: When the difference between the outlet pressure of the compressor oil pump and the compressor crankcase pressure is less than the normal oil supply pressure, the oil pressure difference controller stops the compressor to avoid insufficient oil supply and damage the compressor.
(3) Principle of motor overload protection: When the compressor is overloaded and the motor is overheated, the thermal relay will act and disconnect the compressor circuit to stop it to avoid damage to the motor due to overheating.
(4) Cylinder liner cooling protection principle: The water solenoid valve is linked to the compressor, and the display cases are only allowed to start when the cooling water is connected first.
Others use photoelectric cells to control the work of the fuel supply pump to realize automatic refueling: use a micro pressure difference controller to control the thickness of the evaporator frost layer, and realize automatic defrosting from time to time: use a platinum thermal resistance as a temperature measuring element, and indicate the temperature The meter knows the actual temperature of each display case in time, so as to achieve the purpose of roving and telemetering the temperature of the display cases.
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