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Supermarket refrigerated showcase differential pressure controller refrigeration system
supermarket refrigerated showcase differential pressure controller refrigeration system
supermarket refrigerated showcase differential pressure controller The differential pressure controller of the refrigeration system mainly includes oil pressure difference controller, ammonia pump pressure difference controller and so on.
oil pressure difference controller The oil pressure difference controller is a protection device used to prevent supermarket refrigerated showcase refrigeration compressors from damaging the bearings due to insufficient lubricating oil pressure. If the oil pressure cannot be established within 60 seconds after the refrigeration compressor is started, the oil pressure difference controller will automatically cut off the power supply to ensure the safe operation of the system. The real oil supply pressure is the difference between the outlet pressure of the oil pump and the compressor crankcase pressure. Therefore, the protection of oil pressure should be realized by an oil pressure difference controller. At present, the oil pressure difference protection for compressors at home and abroad is a pressure difference controller with a delay device. The typical domestic product is JC3.5 differential pressure controller. Working principle of
: According to two different pressures acting on two opposing pressure-sensitive elements (bellows), the force generated by the difference is balanced by the spring. If it is less than the set value, the switch will be connected due to the action of the lever. The electric heater in the on-delay mechanism will activate the delay switch within a certain delay range (about 60 seconds), cut off the supermarket refrigerated showcase motor power supply to stop the compressor, and at the same time the heater stops heating. The delay mechanism of the controller is equipped with a manual reset device. When the compressor stops because the oil pressure cannot be established, the controller cannot automatically reset after the action. You must press the reset button after troubleshooting to enable the delay mechanism The delay switch in turns on the power of the motor to start the compressor. There is a test button on the cover of the differential pressure controller to test the reliability of the delay mechanism. During the normal operation of the refrigeration compressor, push the button in the direction of the arrow and hold it for more than 60 seconds until the simulated oil pressure disappears. Force the switch K to the position connected with YJ to energize the heater and heat the bimetallic sheet. If the power supply can be cut off and the compressor can be stopped within the time of pushing the test button, it means that the delay mechanism can work normally and the differential pressure controller can play the role of oil pressure protection. It should be noted that it is precisely because of the delay mechanism in the differential pressure regulator circuit that the supermarket refrigerated showcase compressor can be started normally without oil pressure, that is, it takes about 60S from the start of the compressor to the establishment of normal oil pressure. If there is no delay mechanism, when the compressor is just started, because the oil pressure is less than the given value, the switch Ksx of the pressure difference controller will immediately cut off the power of the compressor motor, causing the compressor to fail to start and put into operation. Use an ordinary differential pressure controller with no delay mechanism to protect the oil pressure of the compressor.
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