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What is the reason for excessive vibration when using Fusheng air compressor?
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Release time:
2023-05-11
During the operation of Fusheng air compressor, vibration is inevitable, but excessive vibration during operation will cause serious damage to the air compressor. The following is an analysis of the causes of excessive air compressor vibration:
1. Fusheng air compressor vibrates after starting: When the unit starts, due to the large starting current and large instantaneous torque of the unit, the motor has a sense of displacement. In addition, passing through the surge zone during startup is an unstable process, with obvious vibration fluctuations.
Take a company’s Fusheng air compressor as an example. Due to irregular start-up, the position and scale of the inlet guide vane are often inconsistent during start-up, resulting in large starting current and even obvious surge sensation, resulting in large vibration after start-up. Therefore, multiple starts will affect the service life of the compressor and require frequent shutdowns for maintenance. Frequent starts and stops will also affect the vibration of the unit. It is forced to start and stop several times a year due to unallowable observation conditions or the effects of mechanical failures, which results in damage to the rotor balance. When parking, dust or other oxides accumulated on the rotor will fall off unevenly, destroying the balance of the rotor. Because the large torque at the start and stop moments has a great impact on the gear shaft and seals. Although the fit between the seal and the shaft is within an acceptable range, it will produce a large axial displacement, which will always cause wear on the seal and bearing at a certain point, thus reducing the surface finish of the seal or bearing, thereby increasing Vibration may even damage the equipment.
2. The influence of Fusheng air compressor bearings: In the past, air compressors often used two sliding bearings. After 2003, the sliding bearings of the air compressor were modified and the bearing bushes were upgraded based on the original air compressor body. Five tilting bearing pads are used, and the amount of oil between the bearing pads and between the bearing pads and the shaft is increased. Although the lubrication and cooling performance have been improved, the sealing performance is not as good as the original sliding bearing; however, the vibration is reduced and the mechanical efficiency is greatly improved, which has been recognized by the industry. The drawback is that bearing temperature and vibration detection equipment often drifts and jumps, and re-adjustment is based only on experience and lack of standards, which makes daily monitoring fail and brings misjudgment to the operator.
3. Effect of condensate on Fusheng air compressor: Condensate containing corrosive gases in the air causes serious corrosion to the rotor, air seal, diffuser and carbon steel air piping, causing air vortex vibration. The erosion of the pipe oxide caused the rotor balance to be damaged and the vibration was strong, so it was forced to stop. This kind of accident has happened twice. The impact of condensation water, especially in humid weather, is that the condensation water is not discharged in time, or the drain valve fails, causing the condensation water to be unable to be discharged, thereby bringing water into the impeller. Vibration intensifies and equipment is damaged.
4. Due to poor alignment of the Fusheng air compressor during maintenance and repair, axial displacement causes increased vibration values: motion and torque are transmitted through the coupling between the cylinders. Due to installation errors of the unit, thermal expansion under working conditions, deformation behind the bearings, and uneven settlement of the unit foundation, misalignment between the cylinder axes may occur during unit operation. Misalignment will result in alternating axial and radial forces, axial vibration, and radial vibration, which will increase with the severity of the misalignment. Coupling failure may be caused by coupling installation errors, coupling manufacturing imbalance, excessive coupling end face deviation, insufficient manufacturing accuracy of flexible couplings, and cancellation. The main causes of bearing defects are excessive bearing clearance and oil film whirl.
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