It is so simple to change the oil in a half-sealed piston compressor, can you

It is so simple to change the oil in a half-sealed piston compressor, can you?

The semi-hermetic piston compressor must pay attention to the condition of the freezing oil during the first 500 hours of operation. After the first compressor is started, carefully observe the oil temperature and oil pressure changes. If the oil changes color, the oil must be changed until the system is clean. For a compressor unit that is normally put into production and operation, the compressor unit should be operated for 2000 hours for the first time, and then run for a cumulative period of three years or if the operating time exceeds 10,000 to 12,000 hours.
1. Operation Regulation of Refrigerating Oil Replacement
1. Close the high-pressure exhaust and low-pressure suction cut-off valves, use the process valve needle on the press to release the refrigerant inside the press, and make the compressor crankcase communicate with the atmosphere.
2. Unscrew the oil drain plug at the bottom shell of the crankcase, drain the frozen oil in the crankcase and remove the filter to clean it.
3. Nitrogen 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. Injection of frozen oil
Option 1: Unscrew the process port plunger on the side of the crankcase of the compressor as a filling port to pour the freezing oil into the crankcase through a suitable tool;
Option 2: (For the piston machine) Connect the low-pressure pipe of the fluorine-filled meter to the low-pressure process valve needle of the press chamber, use a vacuum pump to pump the crankcase to negative pressure, remove the other fluorine-filled pipe separately, and insert the In the container with 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 suck the freezing oil into the crankcase.
Description:
1. When changing oil, you can add less, generally to the lower limit of the sight line of the sight glass.
2. After the refrigerating oil filling is completed, tighten the process plunger or remove the fluorine filling tube, and connect the fluorine pressure gauge to evacuate the compressor.
3. After the vacuum is completed, open the compressor high and low pressure shut-off valve to check whether there is refrigerant leakage.
4. Check the compressor lubrication and sight glass oil level immediately after starting the unit. If the oil level is lower than the normal range (1/4 sight glass), refrigerating oil must be added. If necessary, oil pressure gauge can be connected to the oil pump needle valve to check the oil pressure.
5. The pressure on the suction side of the oil pump of the semi-sealed piston compressor should be basically the same as the low-pressure suction pressure, and the allowable value of the oil pressure difference is 1.4 to 3.5 bar.
Precautions:
Refrigerated oil is hygroscopic, and water reacts chemically with oil in the oil. Special care is required during work to minimize the air entering the system and the oil storage container; the addition of frozen oil cannot be added excessively. Risk of liquid strike.