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First, the basic information of the equipment

 MS500AD vacuum pump is a two-stage rotary vane pump produced by South Korea BESTECH, is one of the important production equipment for photoelectric enterprises, commonly used in vacuum coating process to create a vacuum environment. The pump was purchased in 2015, has been running overall more stable, but recently there are some abnormalities, affecting the normal production operations, so the maintenance check was arranged.

Second, the fault phenomenon description

1. Vacuum insufficiency

After starting the vacuum pump and running for a period of time, observed through the vacuum detection instrument, the vacuum can not reach the normal working requirements of the set value, always maintained in a significantly higher than the standard range of values, resulting in the production process required by the vacuum environment can not be effectively formed, and the related product quality has been affected.

2. Abnormal operation noise

Accompanied by the problem of insufficient vacuum, the vacuum pump in the operation process also issued an abnormal noise, this noise and the previous normal operation of the smooth, low sound has a clear difference, showing intermittent sharp sound, and with the increase in running time, the noise loudness seems to have a tendency to gradually increase.

Professional vacuum pump maintenance team: Shenzhen Eureka Technology Co., Ltd

Three, the troubleshooting and diagnostic process

(A) Appearance and connection parts inspection

(C) internal mechanical parts inspection

1. Disassemble the pump body

After eliminating the common problems of appearance, connection parts and electrical system, the maintenance personnel decided to further disassemble the vacuum pump and check the internal mechanical parts in depth. Disassemble the pump body's casing, end cover and other parts in order according to the instruction of the equipment manual.

2. check the rotor and rotary vane

3. Check the seals

Then, all kinds of seals inside the pump body were inspected. It was found that some of the sealing fittings had been aging and failing due to long time use, and some of them even had tiny cracks, which obviously could not guarantee a good sealing effect, and was also a potential factor causing insufficient vacuum.

4. Check the bearings

Rotate the rotor by hand, feel the resistance and smoothness of the rotation process, and listen carefully to whether there are abnormal sounds from the bearing parts. Inspection found that the bearing rotation feel slightly dry, and accompanied by a slight stuck phenomenon, indicating that the bearing may have poor lubrication or wear and tear of their own, which not only affects the normal operation of the rotor, but also may be one of the sources of abnormal noise.

Fourth, maintenance measures and implementation process

(A) replacement of worn blades

(ii) Renewal of seals

(C) bearing maintenance and replacement

(D) pump body cleaning and assembly

After completing the replacement and maintenance of key components, the entire pump body was cleaned meticulously, using clean rags to remove internal oil, dust and other impurities, to ensure a clean and tidy internal environment. Then in accordance with the reverse order of disassembly, carefully assembled each component gradually back to its original position, in the assembly process, carefully check the installation position of each part, tighten all the screws to ensure that the connection is firm and reliable.

Five, after maintenance test

1. Initial start-up test

After completing the assembly, the maintenance personnel carried out the initial start-up test on the vacuum pump. After connecting the power supply, the vacuum pump started smoothly, and the running sound became smooth and normal compared with that before the repair, and the abnormal sharp noise disappeared, which initially indicated that the repair measures had played a positive effect.

2. Vacuum degree test

Professional vacuum measuring instruments were used to test the working vacuum of the vacuum pump. After a period of operation, observed that the vacuum value can be stabilized and maintained in the normal operation of the equipment required by the standard range, fully meet the production process on the demand for vacuum environment, so it can be determined that the maintenance has successfully solved the problem of vacuum pump failure.

Sixth. Maintenance Summary and Recommendations

1. Maintenance summary

It can be seen through this MS500AD vacuum pump repair case that, for this type of vacuum pump, the failure of insufficient vacuum and abnormal operation noise is likely to be caused by the wear and aging of internal mechanical parts (such as vanes, seals, bearings, etc.) after a long time of use. In the maintenance process, it is necessary for the maintenance personnel to have solid professional knowledge, skilled maintenance skills and rigorous work attitude, in accordance with the standardized process of comprehensive and detailed investigation of the equipment, accurately determine the cause of the failure and take effective maintenance measures to ensure that the equipment is restored to the normal operating state.

2. Recommendations

In order to prolong the service life of MS500AD vacuum pump and reduce the frequency of failures, it is recommended that the user unit do the following maintenance work:

Professional vacuum pump maintenance team: Shenzhen Eureka Technology Co., Ltd