Blower opening operation
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When turning on the blower, first close the inlet baffle, slightly open the blower outlet valve and then start the motor. After the blower is started, gradually open the inlet and outlet. Please tell me, why do you need to close the inlet first and then open the blower? Why don't you open the inlet valve first like a centrifugal pump?
The main consideration is the load issue. If the inlet and outlet are fully opened, the motor starts with a huge load. The main consideration for the pump start-up procedure is that the pump cannot be evacuated. Fans have no such concerns
The blower blades are of axial flow nature, with large flow and low pressure. If the inlet valve is fully opened and started, as mentioned on the second floor, the motor load is too large. I don’t know, right? 》
The main problem is the motor load. If it is fully opened, the motor load will be too great.
The starting current of the motor is about 6 to 7 times the rated current. In this case, increasing the process load will cause the motor to be overloaded.
Protect the motor from overcurrent when starting.
I personally think that both are centrifugal pumps, and they are all turned off to reduce the starting current. The difference lies in the different media. If the liquid pump turns off the inlet, it will be evacuated, but it does not matter for the gas pump, haha!
Just to start, reduce the starting current, start without load, and then increase the amount when the rated speed is reached! ! !
The characteristics of the fan are different from those of the centrifugal pump. You need to check the fan characteristics table to find out. A fully open inlet will overload the fan.
Centrifugal blowers must consider the surge problem. If the inlet baffle is opened when starting the fan, the inlet air volume of the blower will be large, and the fan outlet pressure will rise rapidly to reach or even exceed the surge value, which may easily cause fan failure.； Another consideration is the motor load issue to prevent motor current overload! My little opinion, for reference only
It's also a load issue. Try to start the motor under a small load