supermarket refrigerated showcase » article > display refrigerator > Freon display cases Automatic control analysis of refrigeration equipment (2)
Freon display cases Automatic control analysis of refrigeration equipment (2)
Freon display cases Automatic control analysis of refrigeration equipment
For example: if the temperature of the meat cabinet is higher than the specified cabinet temperature, the contact of the temperature controller 1WD is closed, and the solenoid valve is 1DF The coil is energized and the solenoid valve is opened. At this time, the expansion valve is also opened due to the increase in temperature of the display cases, so the refrigerant enters the evaporator of the meat cabinet to cool down: At the same time, the coil of the intermediate relay 1ZJ is energized to close the normally open contact 1ZJi. Cabinet fan start: normally open contact lZJ2 is closed, the green indicator light is on, normally open contact l2.13 is closed, the contactor 1C coil of the cooling water pump is energized, normally open contact 1Cl is closed, and the water pump starts to work. It can be seen from the figure that the cooling water pump is controlled by five display cases temperature controllers and two compressors, as long as any one of them is in the on state (that is, as long as any one of lZJ3-5ZJ3, 2C3 and 3C3 When the contact is turned on), the water pump is put into operation: the water pump stops only when all the five display cases and the two compressors stop working. As the refrigeration device works, the temperature of each cabinet gradually drops. When the temperature of a certain display cases reaches the specified value, the temperature controller cuts off the solenoid valve of the circuit. When the five display cases reach the specified temperature, the five solenoid valves are all cut off and all the liquid supply to the cabinet room evaporator is stopped. At this time, because the compressor is still running, the low pressure pressure drops. When it reaches the low pressure cutoff value, the low pressure controller 1YLi (or 2YL2) is disconnected, causing the coil of the intermediate relay 7ZJ to be de-energized and the normally closed contact 7ZJl Closed, the coil of the intermediate relay 8ZJ is energized, and the normally closed contact 8ZJ: disconnected, so the coil of the contactor 2C is de-energized, the contact 2Cl is disconnected, and the No. I compressor stops. If the temperature of a certain display cases rises and exceeds the specified temperature value, the action process is opposite to the above, and the compressor is put into operation immediately. Therefore, through the work of the above four adjustment elements, the temperature of each display case can be controlled within the required range.
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