CN205744592U - A kind of fan blade in multi-wing centrifugal fan - Google Patents

Abstract

The utility model discloses a fan blade in a multi-blade centrifugal fan, which comprises a plurality of blade bodies. The other arc surface is provided with a bionic non-smooth structure, and the air flows through the bionic non-smooth structure and then passes through the zigzag structure. The utility model can effectively reduce noise, increase air volume and increase air pressure.

Description

A fan blade in a multi-blade centrifugal fan

technical field

The utility model relates to a fan blade, in particular to a fan blade in a multi-wing centrifugal fan.

Background technique

Multi-blade centrifugal fans have the characteristics of large flow coefficient, high pressure coefficient and compact structure, and have been widely used in industrial products. At present, most of the fans in the range hood industry use multi-blade centrifugal fans. In addition, they are also widely used in household in the air conditioner. The noise and efficiency of air conditioners and range hoods, which are closely related to people's lives, have become two performance indicators that have attracted much attention. At present, multi-blade centrifugal fans mostly adopt the impeller structure of equal-chord straight blades, as shown in Figure 1, that is, the inlet and outlet edges of the blades are parallel to the axis of the impeller, and the shape and size of each section along the span direction are the same. If the pressure coefficient is below 0.5, the pressure under the same conditions can only be achieved by using high speed or large impeller diameter, and increasing the impeller diameter is limited by space, and increasing the speed increases the noise. Secondly, the installation angle of the blade inlet is the same at all points on the edge of the impeller, and the airflow velocity at this place is uneven, which makes the airflow at all points on the edge of the impeller have a great impact on the impeller, reducing the impact of the impeller. The service life of the fan is accompanied by a large noise; and at the air outlet of the sheet, due to the blockage of the flow channel, it is easy to form a vortex, which affects the air output of the fan, making the efficiency of the fan low, and due to the existence of the vortex, it increases the fan's performance. Eddy current noise, therefore, the use of equal-chord straight blade impeller structure greatly reduces the efficiency of the impeller. At present, the efficiency of range hoods is relatively low, only about 25%, and range hoods and air conditioners are widely used in people daily life, so energy saving is very necessary.

Utility model content

The purpose of the utility model is to overcome the above-mentioned shortcomings of the prior art, and provide a fan blade in a multi-blade centrifugal fan, which can effectively reduce noise, increase air volume, and increase wind pressure.

In order to achieve the above purpose, the fan blades in the multi-blade centrifugal fan described in the utility model include several blade bodies, and both ends of the blade bodies are arc surfaces, wherein one arc surface of the blade body is provided with a zigzag structure, Another arc surface of the blade body is provided with a bionic non-smooth structure, and the air flows through the bionic non-smooth structure and then passes through the zigzag structure.

The bionic non-smooth structure is a wavy structure.

The included angle between two adjacent teeth in the zigzag structure is 30-50°.

The height of each tooth in the zigzag structure is 0.4mm-2mm.

The height of each peak in the bionic non-smooth structure is 0.2mm-0.8mm.

The distance between two adjacent troughs in the bionic non-smooth structure is 3mm-7mm.

Two sets of sawtooth structures are provided on the arc surface of the blade body, and the two sets of sawtooth structures are located on both sides of the corresponding arc surface.

Two groups of bionic non-smooth structures are provided on the arc surface of the blade body, and the two groups of bionic non-smooth structures are located on both sides of the corresponding arc surface.

The utility model has the following beneficial effects:

The fan blade in the multi-blade centrifugal fan described in the utility model includes a blade body, and both ends of the blade body are arc-shaped, so that the cross-section of the blade body along the axial direction is different, and the degree of deflection and the degree of inclination of the inlet airflow are reduced. Impact loss, reduce the friction loss at the entrance of the front end of the airflow channel and the blockage of the blade passage entrance, and at the same time make the airflow velocity gradient distribution on the inlet flow section uniform, and make the airflow velocity adapt to the rapid change from the top to the bottom of the fan blade during the turning process , so as to reduce the separation loss caused by the bending of the blade path, reduce the outlet vortex and secondary flow at the top of the impeller, improve the intake flow, reduce turbulent noise, and improve the efficiency of the centrifugal fan. In addition, a zigzag structure is provided on an arc surface of the blade body, which can reduce the vortex generated at the air outlet of the blade due to blockage of the flow channel, and at the same time weaken the intensity of the vortex and improve the flow of air in the blade channel; the blade The other curved surface of the body is equipped with a bionic non-smooth structure, which can weaken the reflection of sound waves, reduce the vortex formed in the inlet area of the fan blade, improve the air intake flow, weaken the impact of the air flow on the front edge of the fan blade, and reduce the centrifugal force. Fan noise.

Description of drawings

Fig. 1 is a schematic structural diagram of a conventional fan blade.

Fig. 2 is the structural representation of the utility model;

Fig. 3 is a partially enlarged view in the utility model;

Fig. 4 is the structural representation of existing multi-blade centrifugal fan;

Fig. 5 is a structural schematic diagram of the multi-blade centrifugal fan in the present invention.

Among them, 1 is the blade body, 2 is the bionic non-smooth structure, and 3 is the zigzag structure.

detailed description

Below in conjunction with accompanying drawing, the utility model is described in further detail:

With reference to Fig. 2, the fan blade in the multi-blade centrifugal fan described in the utility model comprises several blade bodies 1, and both ends of the blade body 1 are arc surfaces, wherein, one arc surface of the blade body 1 is provided with a zigzag Structure 3, the other arc surface of the blade body 1 is provided with a bionic non-smooth structure 2, the airflow passes through the bionic non-smooth structure 2 and then passes through the zigzag structure 3, between two adjacent teeth in the zigzag structure 3 The included angle is 30°-50°, the height of each tooth in the zigzag structure 3 is 0.4mm-2mm, the height of each peak in the bionic non-smooth structure 2 is 0.2mm-0.8mm, and the adjacent The distance between the two troughs is 3mm-7mm. Two sets of zigzag structures 3 are arranged on the arc surface of the blade body 1. The two sets of zigzag structures 3 are located on both sides of the corresponding arc surface. The arc surface of the blade body 1 There are two groups of bionic non-smooth structures 2, the two groups of bionic non-smooth structures 2 are located on both sides of the corresponding arc surface, and the bionic non-smooth structures 2 are wavy structures.

Through experiments, compared with the traditional multi-blade centrifugal fan, the multi-blade centrifugal fan of the present utility model can increase the air volume by more than 5%, increase the wind pressure by more than 6%, and reduce the noise by more than 0.5dB. According to the power P=Q* of the centrifugal fan B shows that the efficiency of the multi-blade centrifugal fan of the present invention is higher, wherein, B is the full wind pressure of the fan, and Q is the air volume. In addition, the utility model has a simple structure and low manufacturing cost, which can greatly reduce the weight of the impeller, thereby improving the working efficiency of the driving motor of the centrifugal fan, so that a motor with a lower power can be selected to meet the original multi-blade centrifugal fan requirements. ,Energy saving and environmental protection.

Claims (3)

1. the fan blade in a multi-wing centrifugal fan, it is characterized in that, including some blade body (1), the both ends of the surface of blade body (1) are cambered surface, wherein, for being provided with zigzag structure (3) in one cambered surface of blade body (1), another cambered surface of blade body (1) is provided with bionic, non-smooth structure (2), air-flow after described bionic, non-smooth structure (2) again through described zigzag structure (3)；

Described bionic, non-smooth structure (2) is wavy shaped configuration；

In described bionic, non-smooth structure (2), the height of each crest is 0.2mm-0.8mm；

In described bionic, non-smooth structure (2), the spacing between adjacent two troughs is 3mm-7mm；

The cambered surface of blade body (1) is provided with two groups of zigzag structures (3), and described two groups of zigzag structures (3) are positioned at the both sides of corresponding cambered surface；

The cambered surface of blade body (1) is provided with two groups of bionic, non-smooth structures (2), and described two groups of bionic, non-smooth structures (2) are positioned at the both sides of corresponding cambered surface.

Fan blade in multi-wing centrifugal fan the most according to claim 1, it is characterised in that in described zigzag structure (3), the angle between adjacent two teeth is 30 °-50 °.

Fan blade in multi-wing centrifugal fan the most according to claim 1, it is characterised in that in described zigzag structure (3), the height of each tooth is 0.4mm-2mm.