supermarket refrigerated showcase » article > display refrigerator > Walk-in cooler evaporation pressure adjustment and its control components (2)
Walk-in cooler evaporation pressure adjustment and its control components (2)
If the walk-in cooler does not install an evaporation pressure regulating valve at high temperatures, each evaporator can only operate at the same evaporation pressure (the evaporation pressure of the low-temperature cabinet) Work, it is easy to cause the deterioration of the refrigerated food in the high temperature cabinet and the increase of dry consumption. Operation principle: When the evaporating pressure rises, it overcomes the pressure of the spring and pushes the valve seat to move up, and the valve opening is opened, so that the amount of refrigerant flowing out of the evaporator increases, and the pressure of the evaporator decreases, keeping it within a given range: On the contrary, if the evaporation pressure drops, the valve opening will be closed, the amount of refrigerant flowing out will decrease, and the evaporation pressure will rise back to the given value range. It is a structural schematic diagram of a direct-acting evaporative pressure regulating valve. The adjustment method of the evaporative pressure regulating valve: Determine the evaporating temperature of the refrigerant according to 5~10℃ lower than the walk-in cooler temperature, and find out its corresponding saturation pressure (ie evaporating pressure), which is the refrigerant gas pressure at the valve inlet The given value. Before adjustment, connect a pressure gauge to the pressure gauge joint and open the pressure gauge valve. Start the adjustment under the normal operating conditions of the refrigeration device. First relax the adjusting rod to reduce the spring force and let the valve open to work. When the cabinet temperature of the walk-in cooler drops to a given cabinet temperature, turn the adjusting rod immediately to change the spring force. Pressure until the reading on the pressure gauge reaches the given value (note that the reading on the pressure gauge is the gauge pressure).
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