阅读说明：本技术 一种同轴双叶轮风机 (Coaxial double-impeller fan ) 是由 童海标 吕晓峰 叶永波 郑龙 陈福东 郑洁清 于 2019-10-15 设计创作，主要内容包括：本发明公开了一种同轴双叶轮风机,包括风筒、电机支架和电机,所述风筒内固定有电机支架,所述电机支架上固定有电机,所述电机的输出轴从壳体两端伸出,所述输出轴一端设置有前叶轮另一端设置有后叶轮,所述前叶轮与所述后叶轮为相同叶片均匀分布的叶轮,所述前叶轮为所述后叶轮沿电机转动方向转动角度为θ,θ=4πn<Sub>1</Sub>s/v-(2n+1)(θ<Sub>1</Sub>+θ<Sub>2</Sub>)/2,其中θ<Sub>1</Sub>为相邻叶片中点间夹角,θ<Sub>2</Sub>为叶片中点间角度,s为所述前叶轮与所述后叶轮的间距,n<Sub>1</Sub>为电机转速,v为额定风速,n为自然数。这种同轴双叶轮风机有效的减小出风风阻,降低噪音,减小能耗,提升总出风量。(The invention discloses a coaxial double-impeller fan which comprises an air duct, a motor support and a motor, wherein the motor support is fixed in the air duct, the motor is fixed on the motor support, an output shaft of the motor extends out of two ends of a shell, one end of the output shaft is provided with a front impeller, the other end of the output shaft is provided with a rear impeller, the front impeller and the rear impeller are impellers with the same blades and are uniformly distributed, the front impeller is an impeller with the rear impeller, the rotation angle of the rear impeller along the rotation direction of the motor is theta, and the theta =4 pi n 1 s/v‑（2n+1）（θ 1 +θ 2 ) /2, where θ 1 Is the angle between the midpoints of adjacent blades, theta 2 Is the angle between the middle points of the blades, s is the distance between the front impeller and the rear impeller, n 1 The motor rotating speed, v is the rated wind speed, and n is a natural number. The coaxial double-impeller fan effectively reduces the air outlet wind resistance and the noiseThe energy consumption is reduced, and the total air output is improved.)

1. The utility model provides a coaxial bilobed wheel fan, includes dryer (1), motor support (2) and motor (3), dryer (1) internal fixation has motor support (2), be fixed with motor (3) on motor support (2), the output shaft of motor (3) stretches out from the casing both ends, output shaft one end is provided with preceding impeller (4) the other end and is provided with back impeller (5), its characterized in that: the front impeller (4) and the rear impeller (5) are impellers with the same blades uniformly distributed, the front impeller (4) is the rear impeller (5) and the rotation angle of the front impeller (4) along the rotation direction of the motor is theta, and theta =4 pi n₁s/v-（2n+1）（θ₁+θ₂) /2, where θ₁Is the angle between the midpoints of adjacent blades, theta₂Is the angle between the middle points of the blades, s is the distance between the front impeller (4) and the rear impeller (5), n₁The rotating speed of the motor (3), v is the rated wind speed, and n is a natural number.

2. A coaxial twin-impeller fan in accordance with claim 1 wherein: four blades are uniformly distributed on the front impeller (4) and the rear impeller (5), and theta = pi/4.

Technical Field

The invention belongs to the technical field of fans, and particularly relates to a coaxial double-impeller fan.

Background

The fan is a driven fluid machine which increases the pressure of gas and discharges the gas by means of input mechanical energy. Fans are widely used for ventilation, dust exhaust and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings, and for ventilation and draught of boilers and industrial furnaces and kilns; cooling and ventilation in air conditioning equipment and household appliances; drying and selecting grain, wind tunnel wind source and air cushion boat inflating and propelling.

The utility model discloses a name is a bilobed wheel axial fan as disclosing No. CN205714872U, specifically discloses this bilobed wheel axial fan includes base, blade, preceding impeller, back impeller and motor, the base upper surface is equipped with safety net, outer casing and tripe frame, outer casing internal surface is equipped with the inner casing, outer casing one end is equipped with the safety net, the outer casing other end is equipped with the tripe frame, the inner casing upper surface is equipped with motor support, inside preceding impeller, back impeller, motor and the small-size fan of being equipped with of inner casing, preceding impeller one side is equipped with wheel hub, back impeller one side is equipped with fixing device and fixing device one side is equipped with the pillar. The double-impeller axial flow fan greatly reduces the noise of the axial flow fan, can effectively improve the working efficiency of the axial flow fan, is provided with the safety net for preventing dust in the air from entering the axial flow fan, has good anti-corrosion effect because the surface of the blade is coated with the anti-corrosion zinc coating, and prolongs the service life of the axial flow fan.

However, in the use process of the double-impeller axial flow fan, due to the blocking of the front side blades, the rear side blades can be blocked during air outlet, so that the wind resistance is increased, the noise is high, the energy consumption is increased, and the total air outlet volume is increased.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the coaxial double-impeller fan which can effectively reduce the air outlet wind resistance, reduce the noise, reduce the energy consumption and improve the total air output.

In order to solve the technical problem, the invention is solved by the following technical scheme: the utility model provides a coaxial bilobed wheel fan, includes dryer, motor support and motor, the dryer internal fixation has motor support, be fixed with the motor on the motor support, the output shaft of motor stretches out from the casing both ends, output shaft one end is provided with preceding impeller other end and is provided with back impeller, preceding impeller with back impeller is the impeller of same blade evenly distributed, preceding impeller does back impeller is for theta, theta =4 pi n along motor direction of rotation turned angle, theta =4 pi n₁s/v-（2n+1）（θ₁+θ₂) /2, where θ₁Is the angle between the midpoints of adjacent blades, theta₂Is the angle between the middle points of the blades, s is the distance between the front impeller and the rear impeller, n₁The motor rotating speed, v is the rated wind speed, and n is a natural number. The air pushed by the blade center of the front impeller of the coaxial double-impeller fan can flow out from the center of the blade gap of the rear impeller when flowing to the rear impeller, so that the blocking of the rear impeller to the front impeller is reduced, the air outlet wind resistance is effectively reduced, the noise is reduced, the energy consumption is reduced, and the total air output is increased.

In the above technical solution, preferably, four blades are uniformly distributed on the front impeller and the rear impeller, and θ = pi/4.

Compared with the prior art, the invention has the following beneficial effects: the air pushed by the blade center of the front impeller of the coaxial double-impeller fan can flow out from the center of the blade gap of the rear impeller when flowing to the rear impeller, so that the blocking of the rear impeller to the front impeller is reduced, the air outlet wind resistance is effectively reduced, the noise is reduced, the energy consumption is reduced, and the total air output is increased.

Drawings

Fig. 1 is a schematic half-section structure diagram of an embodiment of the present invention.

Fig. 2 is a perspective structural diagram of an embodiment of the invention.

Fig. 3 is a schematic structural diagram of a front impeller or a rear impeller in an embodiment of the present invention.

Detailed Description

The invention is described in further detail below with reference to the following detailed description and accompanying drawings: referring to fig. 1 to 3, a coaxial dual-impeller fan comprises an air duct 1, a motor support 2 and a motor 3, wherein the motor support 2 is fixed in the air duct 1, the motor 3 is fixed on the motor support 2, an output shaft of the motor 3 extends out from two ends of a shell, one end of the output shaft is provided with a front impeller 4, the other end of the output shaft is provided with a rear impeller 5, the front impeller 4 and the rear impeller 5 are impellers with the same blades uniformly distributed, the front impeller 4 is an impeller with the rear impeller 5 rotating at an angle of θ along the motor rotation direction, and θ =4 n₁s/2nvθ₁+vθ₁+2nθ₂Wherein theta₁Is the angle between the midpoints of adjacent blades, theta₂Is the angle between the middle points of the blades, s is the distance between the front impeller 4 and the rear impeller 5, n₁The rotating speed of the motor 3, v is the rated wind speed, and n is a natural number. In the present embodiment, four blades are uniformly distributed on the front impeller 4 and the rear impeller 5, and θ = pi/4. The distance between the front impeller 4 and the rear impeller 5 is the included angle theta between the middle points of the adjacent blades according to the rotating speed of the motor 3₁Angle theta between the midpoints of the blades₂And rated wind speed v.

The calculation process is as follows: impeller angular velocity ω =2 π n₁(ii) a The air flow time t = s/v from the front impeller to the rear impeller; since the air from the front impeller to the rear impeller flows out from any blade pitch center of the rear impeller to reduce the wind resistance maximally, 2 n₁× s/v=1/2（θ₁+θ₂）+n（θ₁+θ₂) + θ; thus θ =4 π n₁s/v-（2n+1）（θ₁+θ₂）/2。

The air that this kind of coaxial bilobed wheel fan front vane wheel 4's blade center promoted can flow from the center in 5 blade gaps of back impeller when flowing to back impeller 5 department, reduces the back impeller 5 and to the blockking of front vane wheel 4, and the effectual air-out windage that reduces the noise, reduces the energy consumption, promotes total air output.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.