What are the four steps to the safe operation of screw refrigeration compressors?
1. Preparation:
1. Check that the refrigerant, water and electrical equipment system should be normal
2. Test the rotation of the motor. Since the screw compressor should not be reversed, you can try to rotate the motor after removing the rubber rotating core of the coupling. The rotation of the motor should be counterclockwise when viewed from the side of the compressor. direction;
3. Check the oil level of the oil separator. The correct oil level is when the oil pump is turned on to fill the oil cooler with oil, and the oil level gauge indicates normal;
4. Check whether all pressure gauge valves are open and whether the thermometer socket is filled with lubricant;
5. Check or open all valves on the oil circuit, they should be fully open;
6. Start the oil pump. Check the direction of the oil pump. The oil pressure is not less than 0.05-0.3Mpa gauge pressure (can be adjusted by regulating valve). The differential pressure of the oil filter should not exceed 0.1Mpa. Turn the coupling by hand and operate the energy regulating valve at the same time to make the unloading indication from 0%-100%, then from 100%-0%, and then stop the oil pump;
7. Pull the compressor coupling without jamming;
8. Open the exhaust shut-off valve on the compressor and close the oil return shut-off valve from the compressor to the oil cooler;
9. Supply water to the oil cooler, the amount of water depends on the oil temperature (the injection temperature is preferably 40℃-55℃);
10. Close the main motor power supply and release the control power supply. The power indicator is normal.
2. Start:
1. At the position where the energy adjustment indicator is at 0%, all valves related to the intermediate air supplement are closed, press the joint start button, the oil pump starts first, when the oil pressure reaches normal, the main engine starts, and at the same time opens the suction stop valve (when suction When the air system pressure is high, it should be opened slowly so as not to make the load excessive). First, drive and run, it is not suitable to run for too long, about 3-5 minutes, stop and observe whether the operation is normal
2, the energy adjustment indicator runs at 0% for 30 minutes, and observe the operating conditions;
3. When the compressor is running normally, open the energy regulating valve and gradually load from 0% to 100%. When the pressure ratio between the evaporation pressure and the condensing pressure increases, open the valves of the intermediate air supplement to check the working conditions of each part. Is it normal and reliable.
(1) When the suction and discharge pressure difference is large, and the fuel injection pressure (that is, the difference between the oil pressure after the fine filter oil and the discharge pressure) is small, the oil pressure should be appropriately increased by the oil pressure regulating valve;
(2) If the oil level gauge is found to be leaking, it should be checked and repaired after parking. The upper and lower valves of the oil level gauge should be in the fully open position when working, otherwise the valve will lose safety protection.
Three, check:
1. Check the pressure of suction, exhaust and oil, and the temperature is within the specified range;
2. Observe the opening status of all air valves, oil valves and pipe systems, and check for leaks. A small amount of oil dripping is allowed on the compressor and oil pump shaft seals;
3. Observe the vibration and sound of the machine;
4, check the cooling water system;
5. Observe the current and voltage of the motor.
