BLDC hair dryer Manufacturing.Hair dryer and suction device

　　As disclosed in US patent US4880364, a hair dryer comprises a casing, a motor, a fan, and an air duct. The fan rotates to generate airflow, which is blown out from the air duct. However, the fan of this type of hair dryer uses a centrifugal fan, with the air inlet arranged below the centrifugal fan and the air outlet arranged on the side of the centrifugal fan. Due to the limitations of the structure of the centrifugal fan itself, the air volume blown by this type of blower is often not large, resulting in poor blowing effect and cannot meet the needs of users well.

　　As disclosed in US patent US5975862, a hair dryer uses an engine as its power, which uses gasoline as its fuel as its power, while the fan still uses a centrifugal fan. However, due to the higher power of the engine compared to ordinary motors, it can drive the centrifugal fan to rotate at a higher speed, thereby outputting greater air volume and wind speed, thus meeting user needs to a certain extent. However, due to the high operating noise of hair dryers using gasoline engines, and the use of gasoline for energy supply, it is easy to form atmospheric pollution and not environmentally friendly enough.

　　As disclosed in US patent US7739773, a hair dryer comprises a casing, an engine, a fan, and an air duct. The fan becomes an axial flow fan. The engine is still powered by gasoline, and the engine drives an axial fan through a transmission mechanism to work. However, the engine is arranged far away from the fan, making it appear that the overall volume of the hair dryer is relatively large, which is not in line with the trend of portable and lightweight development. And its power source is still gasoline, which can easily cause pollution to the atmospheric environment.

　　Just like some hair dryers on the market. The motor is located inside the casing and is used to drive the fan to rotate. The air duct includes an air inlet and an air outlet, where air enters and blows out. In order to blow a larger amount of air out of the air outlet, the fan is preferably an axial flow fan. There is also a duct inside the air duct that guides the airflow direction formed by the axial fan. In order to maintain a compact structure of the hair dryer, the motor is installed in the duct. Due to the size of the motor itself, the culvert must also have sufficient dimensions to accommodate the motor. However, the drawback brought about by this is that the work efficiency of the entire hair dryer is reduced.

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