How to test the quality of centrifugal fans
Abstract:
Determine the pressure near the fan. Measure the dry bu […]
- Determine the pressure near the fan. Measure the dry bulb temperature and wet bulb temperature in the air flow channel of the fan inlet. The temperature is measured in a plane, and all these measured data are used to determine the airflow density at each plane concerned.
- The characteristic parameters of the centrifugal fan with imported guide vane fan, including the running state when the guide vane is in the fully open position. Variable inlet guide vanes are considered to be part of the fan. In order to be able to compare the test results with the fan characteristic parameters, the guide vanes should be fixed in the fully open position during the test.China external rotor motor fan Manufacturers
- Record all relevant nameplate data of the motor centrifugal fan, including voltage value and rated load current value. Measure the fan speed and the amperage, volt and watt values of the motor. If the three-phase current method is used to estimate the output power of the motor, it is not necessary to measure the power of the motor. If the motor is not operating at the rated load point and it is far away, it may be necessary to disconnect the drive and measure the no-load current value.
- For a fan with an unrestricted inlet, the sum of the static pressure and dynamic pressure obtained at the inlet can be considered equal to the sum of the static pressure and dynamic pressure; the static pressure and dynamic pressure are measured at a point far enough from the fan inlet As a result, the static pressure on the store is zero, and the dynamic pressure in the still air is also zero.
- Due to the insufficient length of the air duct on the outlet side of the fan, additional resistance of the system will occur. In order to calculate the value of the additional resistance of the system, the length of the outlet air cylinder, the area of the centrifugal fan outlet of the fan and the air supply area of the fan need to be measured.
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