Maintenance of vacuum pump of vacuum drying oven

Issue date:2022/03/08    Views：94    Classification：Common problem

1. Generally, the vacuum pump should be overhauled after 2000 hours of operation, check the aging degree of the rubber seal, check whether the exhaust valve disc is cracked, and clean up the dirt deposited on the valve disc and exhaust valve seat. Clean the parts in the whole vacuum pump cavity, such as rotors, rotating blades, springs, etc. It is usually washed with gasoline and dried. After cleaning the rubber parts, dry them with a dry cloth. When cleaning and assembling, handle with care to avoid bumping.

2. Start the motor. When the vacuum pump operates normally, turn on the outlet pressure gauge and the inlet vacuum pump. After it shows appropriate pressure, gradually open the gate valve and check the motor load at the same time.

3. Check the oil level frequently. If it does not meet the requirements, adjust it to meet the requirements. When the vacuum pump is running, the oil level shall be subject to the center of the oil standard.

4. Check the oil quality frequently. If the oil is deteriorated, replace it with new oil in time to ensure that the vacuum pump works normally.

5. When the vacuum pump is to be stopped, close the gate valve and pressure gauge first, and then stop the motor.

6. After reassembly, the test run should be carried out. Generally, it should be operated in an empty state for 2 hours and the oil should be changed twice. Because a certain amount of volatile substances will be left in the vacuum pump during cleaning, it can be put into normal operation after normal operation.

7. The oil change period shall be considered according to the actual service conditions and whether it can meet the performance requirements, and shall be decided by the user at his discretion. Generally, when a new vacuum pump is used to pump clean and dry gas, it is recommended to change the oil once every 100 hours. When ferrous metal powder is not visible in the oil, the oil change period can be appropriately extended in the future.

8. Add bearing lubricating oil into the bearing body, observe that the oil level should be at the center line of the oil standard, and the lubricating oil should be replaced or supplemented in time.

9. Adjust the packing gland frequently to ensure that the leakage in the packing chamber is normal (it is appropriate to leak in drops).

10. Jog the motor to see if the motor turns correctly.

11. Try to control the flow and head of the vacuum pump within the range indicated on the label to ensure that the vacuum pump operates at the efficiency point, so as to obtain the energy-saving effect.

12. Unscrew the water diversion plug of the vacuum pump body and fill the water diversion (or slurry diversion).

13. If the vacuum pump is found to have abnormal sound, stop immediately to check the cause.

14. During the operation of the vacuum pump, the bearing temperature shall not exceed the ambient temperature of 35C and the temperature shall not exceed 80C.

15. Check whether the vacuum pump pipeline and joint are loose. Turn the vacuum pump by hand to see if it is flexible.

16. The lubricating oil of the vacuum pump shall be changed every 100 hours within the working month, and then every 500 hours.

17. Clean the pipe if possible to ensure that the pipeline is unblocked.

18. Regularly check the wear of the shaft sleeve, and replace it in time after the wear is large.

19. Close the gate valve, outlet pressure gauge and inlet vacuum gauge of the water outlet pipeline.

20. If the vacuum pump is out of service for a long time, it is necessary to disassemble the pump completely, wipe the moisture, coat the rotating parts and joints with grease, install them, and keep them properly.

21. When the vacuum pump is used in cold winter, after stopping, unscrew the drain plug at the lower part of the pump body to drain the media. Prevent frost cracking.