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Analysis of automatic control of ammonia display cooler refrigeration device
author: supermarket refrigerated showcase category: walk-in display coolers Views: 513Time: 2016-08-22
Analysis of automatic control of ammonia display cooler refrigeration device
1) Temperature adjustment and control components: temperature controller 15, electromagnetic pilot valve 7, main valve 6, air cooler 17, ammonia pump 13.
Principle of temperature regulation: When the display cooler temperature is higher than the upper limit of the given temperature, the temperature controller contacts are turned on, and a cooling signal is sent, so that the solenoid pilot valve opens, the main valve opens, and the ammonia pump runs to supply liquid and cool air The machine starts to work, and the compressor starts to work: if the display cooler temperature is lower than the given temperature lower limit, the temperature controller contact opens, so that the solenoid pilot valve closes, the main valve closes, and the liquid supply of the display cooler is stopped. The display cooler air cooler also stops running, so that the display cooler temperature can be controlled within the required range. When the temperature of each display cooler reaches the lower limit of the given temperature, the ammonia pump and compressor will automatically stop working when there is no need to supply liquid to cool down.
2) Condensing pressure adjustment control elements: temperature controller 15, cooling water pump 4.
Principle of pressure regulation: Control the condensing pressure by adjusting the amount of water. The system has three water pumps. The work of the first water pump is controlled by the temperature controller. As long as any display cooler temperature controller sends out a signal that the temperature needs to be cooled, the water pump will be put into operation while the liquid is being supplied to cool down. The other two water pumps are controlled by the pressure controller. As the heat load increases, the condensing pressure will increase. When the pressure rises to 1.28MPa (gauge pressure), the second water pump is put into operation (when the condensing pressure drops to 1.15) MPa (gauge pressure), the pump stops working); when the pressure rises to 1.4MPa (gauge pressure), the third water pump is also put into operation when the condensing pressure drops to 1.25MPa (gauge pressure), the pump stops working .
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