Noise reduction type high speed small size axial flow fan

Abstract

The invention discloses a noise reduction type high speed small size axial flow fan, which comprises an air drum (1), wherein a rotor assembly (2) and a stator assembly (3) are arranged in the air drum (1), the air inlet end of the air drum (1) is provided with an impeller (4) connected with the rotor assembly (2), the rotor assembly (2) comprises a rotating shaft (21), a pair of support bearings(22), magnetic steel (24) and an auxiliary bearing (25) are successively arranged on the rotating shaft (21) in an inflow direction of a fan, the support bearings (22) are connected with a steel sleeve in the air drum (1), a spring (23) is arranged between the support bearings (22), and the auxiliary bearing (25) is connected with the stator assembly (3). The noise reduction type high speed smallsize axial flow fan has the advantages of small radial vibration generated by the rotor assembly during high-speed operation, high running stability, low structural vibration noise, small dynamic andstatic interference between the impeller and an axial guide vane, good noise reduction effect and long service life.

Description

technical field [0001] The invention relates to an axial flow fan, in particular to a noise-reducing high-speed small-size axial flow fan. Background technique [0002] Today, when brushless motors are becoming smaller, lighter and faster, there are very few high-efficiency axial flow fans that match high speeds, especially those with a diameter of less than 100mm. After the product was launched, the development of small and medium-sized axial flow fans and high-speed DC brushless motors in the home appliance industry gradually began. For small-sized axial flow fans, the impeller is directly installed on the motor shaft, and two bearings are usually used to support the rotor. One side of the bearing is the impeller, and the other side of the bearing is magnet steel (commonly used NdFeB magnets). Due to high power and For small diameter requirements, the magnetic steel is generally relatively slender, so it is inevitable that the length of the magnetic steel side (load side)...

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Problems solved by technology

[0003] When considering the noise reduction improvement of axial flow fans, at present, domestic and foreign motor production and R&D enterprises generally focus on the improvement of the assembly compactness of the internal parts of the fan, but there are not many studies on the air guide structure of the fan. The improvement of the air guide structure has great impact on the fan. Noise reduction also has an excellent effect. The wind guide structure of the axial flow fan is mainly the matching structure of the impeller in the fan cylinder and the axial guide vane. Large, the distribution of different outflow angles will make the uniformity of the axial guide vane intake worse, and the displacement of the axial guide vane will in turn affect the outflow of the impeller blades, and the interference between the moving blades and the stationary blades will As a result, the sound pressure level at the passing frequency of the blades rises sharply, which is specifically manifested as louder and sharper noises when the fan is running, especially when the distance between the two is small

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