Rotary vane blower operation failure
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As the title indicates, our facility has several two-stage Roots blowers; one of them experiences a drop in current lasting for about ten minutes while in operation, along with a decrease in outlet pressure and a reduction in noise level. The fan is primarily used to blow air into the water tank; the liquid level in the tank remains constant. The other fan, which operates in parallel as a backup, functions normally, but it is this particular fan that experiences the aforementioned abnormalities when it is in operation. Could some expert please diagnose this? It has been several days now; the motor, lubrication, belt tension, and there are no leaks at the inlet or outlet. The inlet filter has been removed to facilitate diagnosis of the problem.
Is the outlet for the alternate extension fully closed?
If the pressure drops suddenly while the operating parameters of the equipment remain unchanged, check the inlet and outlet valves anyway.
A decrease in current means less work is done. Less work being done could be due to a large gap in the fan rotor, or an obstructed inlet pipeline resulting in low flow rate
An inlet filter, if it exists, hehe
Check whether there are any fluctuations in the process, whether the gas supply volume has decreased, and whether there are any variations in the outlet load
The current has decreased and the load has dropped; the cause should be sought in the medium system, such as whether the inlet pipe is blocked or the gap is too large
A decrease in current means reduced work being done, but the backup fan is functioning normally. Consider whether there are any process-related operational changes when the two fans are used in alternation; if not, consider issues with the system piping. Determine the root cause of the issues by examining factors such as the presence of resonance ranges, blockages, and consistency in the piping system.
Pay special attention to checking the outlet pipeline for any bypass leaks or leaks in the pipeline itself~~~
This post was last edited by Xiamen Juhong on 2018-1-3 at 08:41. Hello, the reason for the decrease in current in the Roots blower is a reduction in load. Here are some points for reference: 1. Please check whether the belt is too loose, as this can affect the transmission efficiency. 2. Test the motor individually to rule out any motor faults. 3. Remove the inlet silencer, start the machine for a test run, and check whether the spindle and impeller are rotating synchronously. If the spindle and impeller become loose, the load will naturally be reduced, and the equipment will not produce any air pressure.