How to change the refrigeration oil of the compressor

How to change the refrigeration oil of the compressor The replacement of refrigeration compressor refrigeration oil is a relatively common item in refrigeration equipment maintenance projects, so many refrigeration workers hope that they can do this by themselves, but they are struggling to find a relatively simple tutorial on the Internet. Just explain to you in detail. 1. Refrigerating compressor refrigeration oil replacement operation: ① Discharge the refrigerant, close the high-pressure exhaust and low-pressure suction cut-off valves, use the process valve needle on the compressor to release the refrigerant inside the compressor, and make the refrigeration compressor crankcase communicate with the atmosphere. ② Unscrew the oil drain plug at the bottom case of the crankcase, drain the frozen oil in the crankcase and remove the filter to clean it. ③Nitrogen gas can be blown in from the low-pressure inflation valve needle to block the oil drain port by hand to increase the pressure in the body, to further remove the residual oil in the body, blow the cleaned filter into the body and tighten the oil drain plug . 2. Refrigerating compressor refrigeration oil replacement operation: ①Unscrew the process port plunger on the side of the crankcase of the refrigeration compressor, and use this as a filling port to pour the freezing oil into the crankcase through a suitable tool. ②Connect the low-pressure pipe of the fluorine-filled meter to the low-pressure process valve needle of the compressor cavity, use a vacuum pump to pump the crankcase to negative pressure, remove the other fluorine-filled pipe separately, and insert one end into the container containing the freezing oil , The other end is connected to the valve needle of the low-pressure suction end of the oil pump, and the negative pressure in the crankcase is used to draw the freezing oil into the crankcase. 3. Refrigerating compressor refrigeration oil replacement operation: ①Because there may be a certain amount of residual oil in the original system, you can add less when changing the oil, generally add it to the lower limit of the sight line of the sight glass. ②2. After the refrigerating oil filling is completed, tighten the process plunger or remove the fluorine charging tube, and connect the fluorine pressure gauge to vacuum the refrigeration compressor. 3. After the vacuuming is completed, open the compressor high and low pressure shut-off valve to check whether there is refrigerant leakage. 4. If there is no missing point, wait 20 minutes and start the unit. 5. The compressor lubrication and sight glass oil level should be checked immediately after starting the unit. If the oil level is lower than the normal range (1/3 sight glass), refrigerating oil must be added. If necessary, an oil pressure gauge can be connected to the oil pump needle valve to check the oil pressure. The pressure on the suction side of the oil pump should be basically the same as the low-pressure suction pressure. The allowable value of the oil pressure difference is 1.4 to 3.5 bar. The screw machine is a differential pressure return oil. , Without oil pump. 6. Some polyester oils have strong hygroscopicity. The water reacts chemically with the oil in the oil and cannot be removed by vacuuming. Special care is required during work to minimize the entry of air into the system and the oil storage container. 7. It should be noted that when replacing the compressor, a certain amount of frozen oil has been stored in the original refrigeration system. If necessary, the oil stored in the system should be blown out. The danger of striking. 8. Do not operate the compressor refrigeration oil in rainy days.

Recent related posts

Customers frequently viewed

Submitted Successfully
Submission Failed