CN115182897A

CN115182897A - Diffusion impeller and fan

Info

Publication number: CN115182897A
Application number: CN202210981475.8A
Authority: CN
Inventors: 蔡武杰; 余慧敏; 曹伟
Original assignee: Wolong Electric Group Co Ltd
Current assignee: Wolong Electric Drive Group Co Ltd
Priority date: 2022-08-15
Filing date: 2022-08-15
Publication date: 2022-10-14

Abstract

The invention discloses a diffusion impeller, which relates to the technical field of fans.A top wall and a bottom wall are respectively fixed on two opposite sides of a blade, and the top wall, the bottom wall, the upper wall and the lower wall are connected into a whole; the thickness of each blade is equal, an airflow channel is formed between every two adjacent blades, and airflow flows through the airflow channels; when the whole diffusion impeller rotates, the blades provide power for airflow, the distance between corresponding points between adjacent blades is gradually increased along the direction of airflow, the cross section area of an airflow channel is gradually increased along the direction of airflow, the size of the cross section of the airflow flowing through the impeller is continuously increased in the process of entering and discharging, by means of the principle of a diffusion pipe, the size of the impeller is increased from an inlet to an outlet to form a diffusion section through the design of blade shapes, and after the airflow passes through the diffusion section, the speed is reduced and the pressure is increased; in the working process, the torque of the impeller is unchanged, and the efficiency and the pressure of the impeller are improved in a mode of pressurizing and reducing the rotating speed.

Description

Diffusion impeller and fan

Technical Field

The invention relates to the technical field of fans, in particular to a diffusion impeller. In addition, the invention also relates to a fan.

Background

With the implementation of the national dual-carbon policy, equipment manufacturers put forward higher requirements on the efficiency of the fan, the higher the efficiency of the fan under the same air volume and air pressure, the smaller the power input by the motor, and the more energy is saved.

The airfoil type wind wheel is characterized in that the thickness of blades is different, although the airfoil type wind wheel can improve the efficiency and reduce the power, the investment cost is higher, the period is long, the processing difficulty is high, a plurality of manufacturers expect to stop the operation, and therefore, the uniform-thickness impeller is still in a main flow impeller form. The efficiency improvement of the equal-thickness impeller needs to break through the bottleneck, and the efficiency, the noise and the reliability of the backward tilting centrifugal impeller are always important parameters for evaluating the quality of a backward tilting centrifugal fan system.

The conventional retroverted centrifugal impeller generally adopts blades with equal thickness, and the shape of each blade is simply rounded.

For those skilled in the art, how to further improve the efficiency of the impeller is a technical problem to be solved at present.

Disclosure of Invention

The invention provides a diffusion impeller, which changes the design structure of blades and improves the efficiency of the impeller by using the principle of a diffusion pipe, and the specific scheme is as follows:

a diffusion impeller comprises an upper disc, a lower disc and blades, wherein two opposite sides of each blade are respectively fixed to the upper disc and the lower disc; an airflow channel is formed between the adjacent blades;

the distance between corresponding points between adjacent blades is gradually increased along the direction of air flow passing through, and the cross-sectional area of the air flow channel is gradually increased along the direction of air flow passing through.

Optionally, the length of the cross-section of the vane increases progressively in the direction of airflow therethrough.

Optionally, the cross-sectional length of the blade in a third range close to the air inlet end is N1, the cross-sectional length of the blade in a middle third range is N2, and the cross-sectional length of the blade in a third range close to the air outlet end is N3, which satisfies the following conditions: 1-N2/N1 <2;1< -N3/N2 <1.5.

Optionally, in the cross section of each two adjacent blades, the length of the arc line where the two outer end points are located is M, and the length of the arc line where the two inner end points are located is L, so that the following conditions are met: 1-woven fabric M/L <3.

Optionally, the joints of the blades and the upper disc are welded intermittently, and the joints of the blades and the lower disc are welded intermittently.

Optionally, the upper plate and the lower plate are respectively provided with a flange for mounting a balance buckle.

Optionally, the thickness of the vanes is equal throughout.

The invention also provides a fan which comprises the diffusion impeller.

The invention provides a diffusion impeller, wherein two opposite sides of a blade are respectively fixed on an upper disk and a lower disk, and the two opposite sides of the blade are connected into a whole; the thickness of each blade is equal, an airflow channel is formed between every two adjacent blades, and airflow flows through the airflow channels; when the whole diffusion impeller rotates, the blades provide power for airflow, the distance between corresponding points between adjacent blades is gradually increased along the direction of airflow passing, the cross section area of an airflow channel is gradually increased along the direction of airflow passing, the size of the cross section of the airflow passing through is continuously increased in the process of entering and discharging, a diffusion section is formed by increasing the size from an inlet to an outlet through the design of blade modeling by using the principle of a diffusion pipe, and after the airflow passes through, the speed is reduced and the pressure is increased; in the working process, the torque of the impeller is unchanged, and the efficiency and the pressure of the impeller are improved in a mode of pressurizing and reducing the rotating speed.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is an axial view of the diffuser vane wheel according to the present invention;

FIG. 2 is a schematic view of the diffuser vane wheel according to the present invention viewed from below;

FIG. 3 is a front view of a diffuser vane wheel provided in accordance with the present invention;

FIG. 4 is a top view of a diffuser vane provided in accordance with the present invention;

FIG. 5 is a front sectional view of a diffuser vane wheel according to the present invention;

FIG. 6 is an enlarged, fragmentary, schematic view of a diffuser vane provided in accordance with the present invention;

FIG. 7 is a schematic view of a diffuser vane wheel provided in accordance with the present invention;

fig. 8 is a schematic structural view of a blade provided by the present invention.

The figure includes:

upper disc 1, lower disc 2, blade 3.

Detailed Description

The core of the invention is to provide a diffusion impeller, change the design structure of blades and improve the efficiency of the impeller by using the principle of a diffusion pipe.

In order to make those skilled in the art better understand the technical solution of the present invention, the diffuser impeller and the fan of the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

With reference to fig. 1 to 5, the present invention provides a diffusion impeller, which includes an upper plate 1, a lower plate 2, blades 3 and other structures, wherein two opposite sides of the blades 3 are respectively fixed to the upper plate 1 and the lower plate 2; the upper plate 1 is provided with a connector, the collector is sleeved on the connector of the upper plate, and a certain gap is required to be kept between the outer diameter of the collector and the inner diameter of the connector, so that the effect can be improved, the noise can be reduced, and the installation is facilitated.

Between adjacent blades 3, an air flow passage is formed, and an air flow passes through the air flow passage between the blades.

A plurality of blades 3 are arranged between the upper disc 1 and the lower disc 2, the blades 3 are arranged in a central symmetry mode, and the blades 3 are identical in shape and size. The distance between corresponding points between adjacent blades 3 gradually increases along the direction of air flow passing, the corresponding point between adjacent blades 3 refers to a point at the same position between adjacent blades 3, and the distance between corresponding points between adjacent blades 3 can be the linear distance between two points or the arc length of an arc where two points are located; the distance between corresponding points between adjacent blades 3 is gradually increased along the direction of air flow passing, so that the cross-sectional area of the air flow channel is gradually increased along the direction of air flow passing, the size of the passed cross section is continuously increased in the process of air flow flowing, the size of the air flow channel from an inlet to an outlet is increased to form a diffusion section, the diffusion section is equivalent to a diffusion pipe, the diffusion pipe is used for pressurizing fluid, when the fluid flows through the diffusion pipe, the kinetic energy of the fluid is converted into enthalpy of the fluid, and the enthalpy is expressed as the increase of the fluid pressure at the outlet of the diffusion pipe.

With reference to fig. 7, wherein the arrows indicate the direction of flow of the air stream, two vanes are shown. According to the invention, the cross section area of the airflow channel formed by the blades 3 is gradually increased along the direction of airflow passing through by improving the shape of the blades 3, compared with the traditional structure with the same size at each part of the airflow channel, the pressure after the airflow is discharged is improved, and the efficiency and the pressure of the impeller are improved in a manner of pressurizing and reducing the rotating speed; under the condition of outputting the same wind pressure, the rotating speed of the blade can be correspondingly reduced, and the working efficiency of the fan is improved; under the condition of equal rotation speed, the output airflow pressure is larger. The diffusion impeller provided by the invention utilizes the principle of a diffusion pipe, and integrally improves the working performance of a fan.

On the basis of the scheme, the length of the cross section of the blade 3 is gradually increased along the direction of the air flow, the length of the cross section is the cross section of the blade 3, the length of the cross section is a curve, the size of the curve is gradually increased, and the length change of the cross section of the blade 3 is matched with the size change of the cross section of the air flow channel.

With reference to fig. 8, a schematic structural view of a single blade 3 is shown, in which three cross sections of the blade 3 are shown: n1, N2, N3, each arrow indicating a cross section. The blade 3 is divided into three regions, each region accounts for one third, the cross section length of the blade 3 close to the one third range of the air inlet end is N1, the cross section length of the middle one third range is N2, the cross section length of the blade 3 close to the one third range of the air outlet end is N3, and the requirements are met: 1-N2/N1 <2;1 N3/N2<1.5; normally, the ratio between N2 and N1 is larger than the ratio between N3 and N2, and the variation from N1 to N2 is larger than the variation from N2 to N3.

On the basis of any one of the above technical schemes and the mutual combination thereof, in the cross sections of the two adjacent blades 3, the length of the arc line where the two outer end points are located is M, and the length of the arc line where the two inner end points are located is L, so that the conditions are met: 1< -M/L <3. It should be noted that the inner and outer ends are opposite to the central axis of the impeller, the outer end point is farther away from the central axis, and the inner end point is closer to the central axis.

Referring to fig. 7, M1, M2, and M3 respectively represent the lengths of the curves of the two blades 3 near the outer end point in three different cross sections, L1, L2, and L3 respectively represent the lengths of the curves of the two blades 3 near the inner end point in three different cross sections, and the three different cross sections respectively satisfy the following conditions:

1<M3/L3<3

1<M2/L2<3

1<M1<L1<3

referring to fig. 6, a represents a welding seam of the blade 3, the connection between the blade 3 and the upper disc 1 is welded intermittently, and the connection between the blade 3 and the lower disc 2 is welded intermittently. That is, along the length of the weld, one section of the weld is on the inside, followed by one section of the weld on the outside, and so on. The welding seam is located blade front and back reason both sides, and it is mainly that the blade is when receiving centrifugal force effect, and the welding seam position is invalid earlier most easily, is the weakest position of impeller structure, so this through the welding seam of alternative arrangement, all plays the effect of welding reinforcement to the inboard and the outside of joint edge, promotes joint strength. And the welding lines arranged alternately can effectively reduce the stress deformation of the blades, ensure the air performance of the blades, ensure the jumping of the impeller to be controlled within a reasonable range, and improve the labor production efficiency.

The upper disc 1 and the lower disc 2 are respectively provided with flanges for mounting balance buckles, the flanges are used for mounting the balance buckles, the balance buckles are used for checking the unbalance of the rotor, and the eccentric rotation is restrained.

The thickness of each part of the blade 3 is equal, namely the blade 3 is the equal-thickness blade, and the processing complexity is lower compared with an airfoil-shaped blade.

In conclusion, the pressure of the impeller can be increased by utilizing the diffusion shape of the blades 3, the torque is unchanged, the effect can be improved, the noise can be reduced, the rotating speed of the impeller can be reduced under the condition of meeting the working condition requirements of customers, and the problem of reliability caused by too high rotating speed is further avoided.

The blade welding adopts the inside and outside to be interrupted the welding, has effectively promoted work production efficiency, has eliminated blade stress deformation, has effectively guaranteed the deformation and the beating of impeller, has reduced impeller vibration value, and then has guaranteed the life of whole fan system.

The invention adopts the blade with the same thickness for modeling, and compared with the composite material impeller, the wing type aluminum alloy impeller has the advantages of low investment cost, low price and large market competitiveness.

The invention also provides a fan which comprises the diffusion impeller and can achieve the technical effects. For other structures of the fan, please refer to the prior art, and the description of the present invention is omitted here.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A diffusion impeller is characterized by comprising an upper disk (1), a lower disk (2) and blades (3), wherein two opposite sides of each blade (3) are respectively fixed on the upper disk (1) and the lower disk (2); an airflow channel is formed between the adjacent blades (3);

the distance between corresponding points of the adjacent blades (3) is gradually increased along the direction of air flow passing, and the cross-sectional area of the air flow channel is gradually increased along the direction of air flow passing.

2. A diffuser vane wheel according to claim 1, characterized in that the length of the cross section of the vanes (3) increases gradually in the direction of the gas flow.

3. A diffuser vane wheel according to claim 2, wherein the cross-sectional length of the vane (3) in the region of the inlet end third is N1, the cross-sectional length of the middle third is N2, and the cross-sectional length of the region of the outlet end third is N3, with the following conditions: 1-N2/N1 <2;1< -N3/N2 <1.5.

4. The diffuser impeller according to any one of claims 1 to 3, wherein in the cross section of two adjacent blades (3), the length of the arc line where the two outer end points are located is M, and the length of the arc line where the two inner end points are located is L, and the conditions are satisfied: 1< -M/L <3.

5. The diffuser impeller according to claim 4, characterized in that the connection of the blades (3) and the upper disk (1) is welded intermittently, and the connection of the blades (3) and the lower disk (2) is welded intermittently.

6. The diffuser vane wheel of claim 4, wherein the upper disc (1) and the lower disc (2) are respectively provided with a flanging for mounting a balancing buckle.

7. A diffuser vane wheel according to claim 4, characterized in that the thickness of the vanes (3) is equal throughout.

8. A fan comprising a diffuser impeller according to any one of claims 1 to 7.