Instrument air compressor
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I would like to ask: when the instrument air compressor is operating at full load, the belt fluctuates significantly up and down periodically, and the current also fluctuates; however, the outlet pressure does not change much. What could be the reason?
What model is your compressor?
From a practical perspective, it seems as though the belt is not capable of driving the mechanism; in such cases, it’s necessary to check the wear condition and alignment of both the belt and the pulley. If everything is in order, then redesigning or selecting a different belt might be an option.
It seems to be a piston-type compressor, depending on the circumstances. If the belt is in this condition, please check: 1. Whether there is any difference in the condition between the old and new parts of the belt. There are new ones and old ones; when the load increases, the situation mentioned by the original poster is likely to occur. 2. The belt might be a bit loose. Check it as follows: shut down the machine, then press on the belt with your hand; it should be difficult to press down. The shorter the belt, the smaller the pressing force should be. The outlet pressure remains unchanged, but the current does change; it’s likely that reason 1 is the main factor.
There is another reason that is not a problem with the device itself. The gas supply for the instruments is actually fluctuating; only when all control valves are in operation can the compressor reach its maximum load. This can be seen from the traffic volume. When the gas consumption decreases, the compressor reduces its load while maintaining the outlet pressure (that is, to meet the gas demand downstream), which results in a decrease in current flow. If the air output volume and outlet pressure remain essentially constant, the current should also remain essentially constant; otherwise, the power consumed will be incorrect.
For instrument air, is the required temperature a dew point of -40 degrees at normal conditions, or -40 degrees at 0.6 MPa?
What was said on the 6th floor makes sense; it is recommended to monitor the changes in the current of the instrument air
Is it because your company chose Nanjing compressors that belts are used?； Other models can be considered, such as Liuzhou Fuda and Shanghai Unites ；
Is it because your company chose Nanjing compressors that belts are used?； Other models can be considered, such as Liuzhou Fuda and Shanghai Unites ；
Adjust the belt tension or replace the belt.
"The belt fluctuates significantly up and down periodically, and the current also fluctuates; therefore, I think the possibility of resonance is high. You can replace the belt with one of higher quality, or change the center distance in order to alter the natural frequency.
Based on what you’ve described, it’s more likely that the belt is loose; there should be no issue with the motor matching. Also, is the belt you’re using a single belt, or are several belts used together? If multiple belts are used, uneven tension can occur, but this problem does not arise when using a single belt.