CN210715259U

CN210715259U - Coaxial double-impeller fan

Info

Publication number: CN210715259U
Application number: CN201921726166.6U
Authority: CN
Inventors: 童海标; 吕晓峰; 叶永波; 郑龙; 陈福东; 郑洁清
Original assignee: Zhejiang Shangjian Blower Fan Co ltd
Current assignee: Zhejiang Shangjian Blower Fan Co ltd
Priority date: 2019-10-15
Filing date: 2019-10-15
Publication date: 2020-06-09
Anticipated expiration: 2029-10-15

Abstract

The utility model discloses a coaxial bilobed wheel fan, including 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 the preceding impeller other end and is provided with the back impeller, preceding impeller with back impeller is the impeller of same blade evenly distributed, preceding impeller does back impeller is theta 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 coaxial double-impeller fan effectively reduces air outlet wind resistance, reduces noise, reduces energy consumption and promotes total air output.

Description

Coaxial double-impeller fan

Technical Field

The utility model belongs to the technical field of the fan, specifically a coaxial bilobed wheel 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 utility model discloses a setting up of bilobed wheel makes this axial fan's noise obtain great reduction, can effectual improvement axial fan's work efficiency, and the safety net that is equipped with prevents during dust gets into axial fan in the air, and the blade surface scribbles the anticorrosive galvanizing coat, and it is effectual to anticorrosive to extension axial fan's life.

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

The utility model discloses it is not enough to prior art, provide a coaxial bilobed wheel fan, this kind of coaxial bilobed wheel fan can effectively reduce the air-out windage, and the noise reduction reduces the energy consumption, promotes total air output.

In order to solve the technical problem, the utility model discloses a following technical scheme can solve: 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 utility model, following beneficial effect has: 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 view of a half-section structure of the embodiment of the present invention.

Fig. 2 is a perspective schematic view of an embodiment of the present 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 will be described in further detail 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, a plurality of 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.

Claims

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.