Hypersonic hair dryer maker.The Method of Adjusting Flow by Throttling the Inlet of Electric Hair Dryer

　　The method of adjusting flow by using the throttling device set before the inlet of the fan is called inlet throttling adjustment. Because throttling increases pipeline resistance, it also changes the pipeline performance curve. Meanwhile, due to the fact that the inlet throttling device is generally installed in the front of the fan inlet, the non-uniform distribution of cross-sectional velocity during throttling directly affects the normal velocity distribution at the impeller inlet, thus also changing the performance curve of the fan.

　　The operating conditions of the device after throttling adjustment are determined by the two performance curves after changes, as shown in Figure 4-13. The original operating point of the fan device is M, with a flow rate; After adopting throttling regulation, the flow rate decreases to, and its operating point is A, resulting in energy loss through regulation. If outlet throttling regulation is used, the operating point should be and the energy loss should be. Due to<, the inlet throttle adjustment is suitable for regulating small fans.

　　The inlet throttle adjustment not only changes the velocity distribution of the impeller inlet, but also reduces the pressure at the impeller inlet, increasing the risk of cavitation for the water pump. Therefore, the water pump does not use this adjustment method.

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