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When the oil supply system of the refrigeration compressor fails, in order to avoid the transmission parts of the refrigeration compressor burning, it is generally equipped with an oil pressure difference controller, which is particularly necessary in the high-speed refrigeration compressor. The pressure difference controller can automatically cut off the power supply when the difference between the lubricating oil pressure and the suction pressure of the refrigeration compressor is still less than a certain value after a certain period of time. Stop the refrigeration compressor. Oil pressure difference controller is usually used thermal delay pressure difference controller, controller action once, must wait for the heat element is completely cooled manually reset, can start to use again.
Oil pressure difference controller in the installation of the general high and low pressure interface are respectively connected to the oil pump outlet oil pressure and crankcase low pressure, the controller body should be installed vertically, high pressure port at the bottom, low pressure port on the top. The oil pressure difference is equal to the difference between the reading of the oil pressure gauge and the reading of the suction pressure gauge. Do not mistake the reading of the oil pressure gauge as the oil pressure difference. The oil pressure difference of the semi-sealed piston compressor is generally set at 0.15 ~ 0.3MPa.
There are several common reasons for oil pressure difference alarm:
1. Insufficient refrigerated oil in the system causes insufficient oil level, causing the oil pump to not absorb oil normally;
2, the oil in the system is too dirty, causing the filter of the oil pump to be blocked;
3, the oil pressure difference relay work is not sensitive;
4, the failure of the oil pump itself can not absorb oil;
5, the refrigerated oil is mixed with a large amount of refrigerant, resulting in oil pressure can not be established;
6, compressor liquid return, crankcase liquid refrigerant too much; Adjust the expansion valve and check the oil heating.
7, crankcase oil temperature is too low
Oil pressure difference alarm processing method:
1, if the refrigerant oil is not enough, you only need to add lubricating oil to the standard oil level of the oil mirror;
2, if the lubricating oil is too dirty, you need to take out the filter to clean and replace the new frozen oil;
3, replace the new oil pressure difference relay;
4, if the oil pump is faulty, it is necessary to replace the new oil pump in time;
5, use the crankcase heating to separate the refrigerant in the lubricating oil, or discharge the refrigerant in the compressor;
6, find the reason for excessive liquid return;
7, need to check the oil heater.
In the actual application process, the oil filter is dirty and blocked, which is a common phenomenon. In this case, we can clean the filter or replace the frozen oil to solve the problem.
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