Surging reduction low-noise fan
A low-noise, fan technology, used in mechanical equipment, machines/engines, liquid fuel engines, etc., can solve the problems of difficult replacement and maintenance work, vibration generated by fans, and unstable airflow, so as to improve fan efficiency and reduce noise. , The effect of reducing the loss of air volume and air pressure
Inactive Publication Date: 2015-03-04
广东佳科风机股份有限公司
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Problems solved by technology
[0002] The current domestic high-speed rail and subway tunnels generally use fans for ventilation. When the axial flow fan is working, the gas backflow will cause the fan to vibrate due to insufficient air outlet pressure or strong pressure difference. This is the surge phenomenon of the fan. The surge phenomenon can seriously damage the fan and even the ventilation ducts connected to the fan
Especially for fans installed in high-speed trains, bullet trains, subways and subway tunnels, when the train passes through the tunnel, there will be an air pressure difference that causes the pressure at the tuyere to drop sharply in an instant, that is, a strong pressure difference will be generated, resulting in severe surge phenomenon; although the high-speed train The air pressure in the car is maintained by the smart piston in the car, but because the speed of the high-speed train is relatively high, the airflow around the train will become unstable due to the high speed of the train. Excellent performance resistance, preventing and improving the surge caused by pressure difference, especially when the fan installed in the tunnel makes the replacement and maintenance work difficult
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[0026] The technical solutions claimed in the present invention will be further described in detail in conjunction with the accompanying drawings and specific embodiments.
[0027] Such as figure 1 and figure 2 As shown, the fan of this embodiment includes the impeller fixed disk 2 and the impeller 1, wherein the impeller 1 is installed on the rotating shaft of the motor and driven by the motor, and the motor aligns with the tuyere on the impeller fixed disk 2 to connect with the impeller fixed disk 2 and The position of the impeller 1 is in the wind guide cover 21 on the impeller fixed disk 2 . In this embodiment, the installation angle of the blades 11 on the impeller 1 can be adjusted between 20-40 degrees, but the whole of the impeller 1 can still be completely inside the wind guide 21 to increase the air outlet pressure of the fan. The edge of the air guide cover 21 is bent outward on one side of the air inlet, and this structure can help to guide the airflow into the ...
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The invention discloses a surging reduction low-noise fan which comprises an impeller and an impeller fixing disk. The impeller comprises a plurality of blades and a hub for fixing the blades; each blade has an uneven thickness from the front edge to the tail edge; each blade comprises six to twenty tooth blocks formed at the tail edge and streamlined bumps which are formed on the outer diameter and protrude out of both surfaces of the blade; each blade also comprises a mounting shaft for being connected with the hub; a round flange is formed on the mounting shaft; the hub is formed by connecting two hub disks and the connecting face of the two hub disks is provided with a mounting groove for fixing the mounting shaft and a flange groove for fixing the flange; an air port in the center of the impeller fixing disk protrudes out of two surfaces of the impeller fixing disk to form an air director; the edge of one side of an air inlet of the air director is flanged outwards and the impeller is integrally positioned in the air director.
Description
technical field [0001] The invention relates to the technical field of fans, in particular to a surge-reducing and low-noise fan. Background technique [0002] The current domestic high-speed rail and subway tunnels generally use fans for ventilation. When the axial flow fan is working, the gas backflow will cause the fan to vibrate due to insufficient air outlet pressure or strong pressure difference. This is the surge phenomenon of the fan. The surge phenomenon can seriously damage the fan and even the ventilation ducts connected to the fan. Especially for fans installed in high-speed trains, bullet trains, subways and subway tunnels, when the train passes through the tunnel, there will be an air pressure difference that causes the pressure at the tuyere to drop sharply in an instant, that is, a strong pressure difference will be generated, resulting in severe surge phenomenon; although the high-speed train The air pressure in the car is maintained by the smart piston in ...
Claims
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IPC IPC(8): F04D29/38F04D29/54F04D29/66
CPCF04D29/384F04D27/0246F04D29/36F04D29/388F04D29/541F04D29/663F04D29/667
Inventor 林伟明
Owner 广东佳科风机股份有限公司