Fan blade of integrated structure and centrifugal fan

Abstract

The utility model discloses an integrated structure fan blade and centrifugal fan, including fan blade disc, a plurality of fan blades are evenly distributed on the outer edge of fan blade disc through bending, has improved the connection strength between fan blades and fan blade disc, has improved the problem of deformation of blade and round disc junction in the high speed rotation process, has improved the efficiency of fan blade, has improved the efficiency of fan blade. The fan blade with the integrated structure can also be applied to a centrifugal fan; the fan blade with the integrated structure has the advantages of high connection strength of the fan blade and the blade disc, high reliability, high dynamic balance performance and low cost, and is applied to the centrifugal fan, so that the working reliability of the centrifugal fan is remarkably improved, the working noise of the centrifugal fan is reduced, and meanwhile, the production cost of the centrifugal fan is also reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to an integrated structure blade and a centrifugal fan. Background Art

[0002] In existing fans, the blades and the blade discs are mostly of a split structure, and the two are fixedly connected to form a complete fan blade. However, the manufacturing cost of the fan blade with this structure is high, and there are problems with the connection reliability between the fan blade and the blade disc. Therefore, there is room for further improvement.

[0003] The national invention patent with the application number 201410011789.0 discloses an integrated blade for a harvester and its manufacturing method; the integrated blade is composed of a complete circular disc surface, and a number of equal fan-shaped surfaces are processed and arranged on the disc surface. An inscribed circular process hole with the two tangent edges of the fan shape as the tangents is arranged in each fan-shaped surface, and the tangents of the upper half parts of the process holes are twisted to form a number of blades with the same specifications and sizes, thus forming an integrated blade. However, there is a problem when the above integrated blade structure is applied to a centrifugal fan: in a centrifugal fan, the fan blade is perpendicular to its rotation direction. During the forming process, the fan blade needs to be twisted by 90° relative to the circular disc. If the width of the connection between the blade root and the circular disc is too wide, the material will be torn during the twisting process of the blade relative to the circular disc; if the width of the connection between the blade root and the circular disc is reduced, although the problem of material tearing during the twisting process of the blade relative to the circular disc can be solved, the connection strength between the blade and the circular disc will be insufficient. When used in a centrifugal fan, the blade will deform and vibrate during high-speed rotation, so it cannot be applied to a centrifugal fan. Summary of the Utility Model

[0004] In order to overcome the deficiencies in the background art, the utility model discloses an integrated structure blade and a centrifugal fan. The connection structure between the blade and the blade disc is a bending connection, which solves the problem of insufficient torsional connection strength between the blade and the blade disc, so that the integrated structure blade can be applied to a centrifugal fan.

[0005] In order to achieve the purpose of the utility model, the following technical scheme is adopted: an integrated structure blade, including a blade disc and blades. There are several blades, which are evenly distributed on the outer edge of the blade disc around the center of the blade disc; a blade disc mounting hole is arranged in the middle of the blade disc; the blade disc and the blades are of an integrated structure, and a bending connection structure is arranged between the blades and the blade disc.

[0006] Furthermore, several blade connecting plates are evenly distributed around the center of the outer edge of the blade disc, and the side edges of the blades are bent and connected to the blade connecting plates.

[0007] Furthermore, the blades are planar.

[0008] Preferably, a plurality of wind blade disc fins are evenly distributed around the outer edge of the wind blade disc along its center of the circle, and the inner root of the wind blade is bent and connected to the wind blade disc fin.

[0009] Furthermore, the wind blade is in a curved surface shape.

[0010] Furthermore, wind blade reinforcing ribs are provided on the wind blade.

[0011] Furthermore, wind blade disc reinforcing ribs are provided on the wind blade disc and the leaf connecting plate, or on the wind blade disc and the wind blade disc fin.

[0012] Furthermore, it further includes a wind blade reinforcing disc, and a reinforcing disc mounting hole corresponding to the wind blade disc mounting hole is provided in the middle of the wind blade reinforcing disc; the wind blade disc is fixedly connected to the wind blade reinforcing disc.

[0013] Furthermore, a plurality of hemming grooves are evenly distributed around the center of the wind blade reinforcing disc, and the inner root of the wind blade is arranged in the hemming groove.

[0014] A centrifugal fan, wherein the integrated structure wind blade described in any one of the above is adopted in the centrifugal fan.

[0015] Due to the adoption of the technical solution as described above, the present utility model has the following beneficial effects: The integrated structure wind blade disclosed by the present utility model includes a wind blade disc and wind blades. A plurality of wind blades are evenly distributed on the outer edge of the wind blade disc through bending, which improves the connection strength between the wind blades and the wind blade disc, significantly improves the deformation problem at the connection between the blades and the circular disc during high-speed rotation, and enables the integrated structure wind blade to be applied to a centrifugal fan; the integrated structure wind blade has the advantages of high connection strength between the wind blades and the blade disc, high reliability, high dynamic balance performance, and low cost. When applied to a centrifugal fan, it significantly improves the working reliability of the centrifugal fan, reduces the working noise of the centrifugal fan, and at the same time reduces the production cost of the centrifugal fan. Description of the Drawings

[0016] Figure 1 It is a schematic view of the appearance of the integrated structure wind blade of Embodiment 1;

[0017] Figure 2 It is a schematic view of the appearance of the integrated structure wind blade of Embodiment 2;

[0018] Figure 3 It is a schematic view of the appearance of the integrated structure wind blade with a wind blade reinforcing disc of Embodiment 3;

[0019] Figure 4 It is a schematic view of the appearance of the wind blade reinforcing disc of Embodiment 3;

[0020] Figure 5 It is a schematic view of the structural decomposition of the integrated structure wind blade with a wind blade reinforcing disc of Embodiment 3;

[0021] Figure 6 Schematic diagram of the appearance of the integrated structure wind blade with a wind blade reinforcement disk for Embodiment 4;

[0022] Figure 7 Schematic diagram of the appearance of the integrated structure wind blade for Embodiment 4;

[0023] Figure 8 Schematic diagram of the appearance of the wind blade reinforcement disk for Embodiment 4;

[0024] Figure 9 Schematic diagram of the structural decomposition of the integrated structure wind blade with a wind blade reinforcement disk for Embodiment 4;

[0025] Figure 10 Schematic diagram of the appearance of the wind blade reinforcement disk for Embodiment 5;

[0026] Figure 11 Schematic diagram of the appearance of the integrated structure wind blade with a wind blade reinforcement disk for Embodiment 5.

[0027] In the figure: 1. Wind blade disk; 1.1. Wind blade disk mounting hole; 1.2. Wind blade connecting plate; 1.3. Wind blade disk fin; 1.4. Wind blade disk reinforcing rib; 1.5. Wind blade disk riveting hole; 2. Wind blade; 2.1. Wind blade reinforcing rib; 2.2. Wind blade root; 3. Wind blade reinforcement disk; 3.1. Reinforcement disk mounting hole; 3.2. Flanging groove; 3.3. Reinforcement disk riveting hole; 3.4. Flanging hole; 4. Rivet. Specific embodiments

[0028] The present utility model can be explained in detail through the following embodiments. The purpose of disclosing the present utility model is to protect all technical improvements within the scope of the present utility model.

[0029] An integrated structure wind blade is produced by stamping process, including a wind blade disk 1 and wind blades 2. There are several wind blades 2, which are evenly distributed around the center of the wind blade disk 1 on the outer edge of the wind blade disk 1. The wind blade disk 1 and the wind blades 2 are of an integrated structure, and the wind blades 2 and the wind blade disk 1 are connected by a bending process; a wind blade disk mounting hole 1.1 is provided in the middle of the wind blade disk 1 for connecting with the motor shaft; the wind blades 2 of the integrated structure wind blade are evenly distributed on the outer edge of the wind blade disk 1 through bending, which improves the connection strength between the wind blades 2 and the wind blade disk 1, significantly improves the deformation problem at the connection between the blades 2 and the wind blade disk 1 during high-speed rotation, and enables the integrated structure wind blade to be also applied to a centrifugal fan. Embodiment 1:

[0030] See the attached drawings of the specification Figure 1: An integrated structure wind blade, comprising a wind blade disc 1 and wind blades 2. There is a wind blade disc mounting hole 1.1 in the middle of the wind blade disc 1. The wind blade disc mounting hole 1.1 is an oblate round hole for connecting with the motor shaft to transmit torque. 11 wind blade connecting plates 1.2 are evenly arranged around the center of the outer edge of the wind blade disc 1. The wind blades 2 are arranged on one side of the wind blade connecting plates 1.2 and are connected to the wind blade connecting plates 1.2 by bending. In this embodiment, the wind blades 2 are planar, and there is a relatively long length at the bending connection between the wind blades 2 and the wind blade connecting plates 1.2. At the same time, there are wind blade disc reinforcing ribs 1.4 on the wind blade disc 1 and the blade connecting plates 1.2 for strengthening the stiffness of the wind blade disc 1 and the blade connecting plates 1.2 in the thickness direction, fully ensuring the connection strength between the wind blades 2 and the wind blade disc 1, so as to ensure that when the centrifugal fan rotates at high speed, the connection between the wind blades 2 and the wind blade disc 1 does not deform and vibrate. Embodiment 2:

[0031] See the attached Figure 2: In this embodiment, the wind blade 2 is a spatial curved surface. Therefore, compared with the first embodiment, there are several differences in the specific structural design. 13 wind blade disc fins 1.3 are evenly distributed around the outer edge of the wind blade disc 1 in a circular pattern. The wind blade disc 1 and the wind blade disc fins 1.3 are provided with wind blade disc reinforcing ribs 1.4 to reinforce the stiffness of the wind blade disc 1 and the wind blade disc fins 1.3 in the thickness direction and prevent the wind blade 2 from vibrating in the axial direction of the motor shaft when the integrated structure wind blade rotates. An extension section is provided at the inner root of the wind blade 2, and the extension section at the inner root of the wind blade 2 is bent and connected to the wind blade disc fins 1.3. In this embodiment, the wind blade 2 is curved, and two wind blade reinforcing ribs 2.1 are also provided on the wind blade 2. One of the reinforcing ribs 2.1 extends to the extension section at the inner root of the wind blade 2. The groove of the reinforcing rib 2.1 is located inside the curved surface of the wind blade 2, and the reinforcing rib 2.1 is in an open state at the outer end of the wind blade 2. The structural design of the above-mentioned blade reinforcing rib 2.1 has the following three technical effects: First, it reinforces the structural strength of the spatial curved surface-shaped wind blade 2 itself and the strength of the extension section at the inner root of the wind blade 2 to prevent bending deformation during rotation. Second, when the wind blade 2 rotates, when the air flow flows from the surface in the width direction of the inner curved surface of the wind blade 2 into the groove of the reinforcing rib 2.1, a turbulent flow will be formed in the groove of the reinforcing rib 2.1. This turbulent flow will form a low-pressure area in the groove of the reinforcing rib 2.1. The low-pressure area actually causes a pressure on both sides in the width direction of the wind blade 2 towards the center in the width direction of the blade, thereby suppressing the vibration of the wind blade 2 in the axial direction of the motor during rotation, reducing the noise during the operation of the centrifugal fan, and improving the efficiency of the centrifugal fan at the same time. Third, when the wind blade 2 rotates, when the turbulent flow in the groove flows out from the open end at the outer side of the wind blade 2, the turbulent flow disappears, and the original kinetic energy of the turbulent flow will be converted into pressure energy. Therefore, the output pressure of the centrifugal fan will be increased. The centrifugal fan using the integrated structure wind blade of this embodiment has a lower operating noise during operation and higher efficiency and output air pressure when driven by a motor with the same power.

[0032] Embodiment Three. Refer to the attached drawings of the specification Figure 3 、 4 、5:

[0033] Refer to the attached drawings of the specification Figure 3 : In this embodiment, a wind blade reinforcing disc 3 is added on the basis of Embodiment Two. Its purpose is to further reinforce the connection strength between the wind blade 2 and the wind blade disc 1. Therefore, when this integrated structure wind blade is applied to a high-power centrifugal fan, there will be no deformation and vibration caused by insufficient connection strength between the wind blade 2 and the wind blade disc 1.

[0034] Refer to the attached drawings of the specification Figure 4: The wind blade reinforcement disc 3 is disc-shaped, and there is a reinforcement disc mounting hole 3.1 in the middle corresponding to the wind blade disc mounting hole 1.1. In this embodiment, the reinforcement disc mounting hole 3.1 is a flattened circular hole or a circular hole with the same diameter size as the wind blade disc mounting hole 1.1. The purpose is to achieve better coaxiality between the wind blade disc 1 and the wind blade reinforcement disc 3 through the assembly tooling shaft when the integrated wind blade and the wind blade reinforcement disc 3 are fixedly connected, and to prevent the dynamic balance from being affected due to non-coaxiality between the wind blade disc 1 and the wind blade reinforcement disc 3 after assembly; 13 hemming grooves 3.2 are evenly distributed around the center of the wind blade reinforcement disc 3. The width of the top of the hemming groove is slightly smaller than the thickness of the wind blade 2. During assembly, the wind blade root 2.2 at the inner root of the wind blade 2 is pressed into the hemming groove 3.2 by pressure to ensure that the wind blade root 2.2 does not loosen in the hemming groove 3.2; when the integrated wind blade and the reinforcement disc 3 are aligned and press-connected, the wind blade disc fin 1.3 and the reinforcement disc 3 are fixedly connected by spot welding.

[0035] Embodiment 4, see the attached drawings in the specification Figure 6 、 7 、8、9:

[0036] See the attached drawings in the specification Figure 6 : Compared with Embodiment 3, the integrated wind blade and the wind blade reinforcement disc 3 are fixedly connected by rivets 4; see the attached drawings in the specification Figure 7 、 8 : In this embodiment, the wind blade reinforcement ribs 1.4 on the wind blade disc 1 and the wind blade disc fin 1.3 of the integrated wind blade are cancelled, reducing the stamping production cost of the integrated wind blade; in this embodiment, wind blade disc riveting holes 1.5 are provided on the wind blade disc fin 1.3, and corresponding reinforcement disc riveting holes 3.3 are added on the wind blade reinforcement disc 3; when the integrated wind blade and the reinforcement disc 3 are aligned and press-connected, the wind blade disc fin 1.3 and the reinforcement disc 3 are fixedly connected by rivets 4.

[0037] Embodiment 5, see the attached drawings in the specification Figure 10 、 11 :

[0038] Compared with Embodiment 4, the integrated wind blade and the wind blade reinforcement disc 3 are fixedly connected by flanging hole anchoring, not only reducing the stamping production cost of the integrated wind blade, but also saving the cost of the rivets 4; see the attached drawings in the specification Figure 10, there are 13 flanging holes 3.4 arranged in a central array on the fan blade reinforcement disc 3. Correspondingly, there are fan blade disc riveting holes 1.5 corresponding to the flanging holes 3.4 on the fan blade disc fins 1.3. After the integrated fan blade and the reinforcement disc 3 are aligned and press-fitted, the flanging of the flanging hole 3.4 passes through the fan blade disc riveting hole 1.5 and is higher than the surface of the fan blade disc fins 1.3. By using an anchoring tool to extrude the flanging of the flanging hole 3.4 outward, the fixed connection between the integrated fan blade and the fan blade reinforcement disc 3 is realized; in this embodiment, the flanging holes can also be arranged on the fan blade disc fins 1.3 of the integrated fan blade, and the corresponding fan blade reinforcement disc 3 is provided with riveting holes.

[0039] Those skilled in the art should understand that those skilled in the art can achieve variation examples by combining the prior art and the above embodiments. Such variation examples do not affect the essence of this solution and will not be elaborated here.

[0040] It should be understood that this solution is not limited to the above specific implementation manners. The equipment and structures not described in detail should be understood to be implemented in a common manner in this field; any person skilled in the art, without departing from the scope of this solution, can make many possible changes and modifications to this solution by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of this solution. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of this solution without departing from the content of this solution still belong to the scope of protection of this solution.

[0041] The parts not described in detail in this utility model are prior art.

Claims

1. An integrated structure wind blade, comprising a wind blade disc (1) and wind blades (2). There are several wind blades (2), which are evenly distributed around the center of the wind blade disc (1) on the outer edge of the wind blade disc (1); a wind blade disc mounting hole (1.1) is provided in the middle of the wind blade disc (1); the characteristics are as follows: The wind wheel disc (1) and the wind blades (2) are of an integrated structure, and a bending connection structure is provided between the wind blades (2) and the wind wheel disc (1).

2. The integrated structure wind blade according to claim 1, characterized in that: A plurality of wind wheel connecting plates (1.2) are evenly arranged around the center of the outer edge of the wind wheel disc (1), and the side of the wind blade (2) is bent and connected to the leaf connecting plate (1.2).

3. The integrated structure wind blade according to claim 2, characterized in that: The wind blade (2) is planar.

4. The integrated structure wind blade according to claim 1, characterized in that: A plurality of wind wheel disc fins (1.3) are evenly arranged around the center of the outer edge of the wind wheel disc (1), and the inner root of the wind blade (2) is bent and connected to the wind wheel disc fin (1.3).

5. The integrated structure wind blade according to claim 4, characterized in that: The wind blade (2) is curved.

6. The integrated structure wind blade according to claim 5, characterized in that: The wind blade (2) is provided with wind blade reinforcing ribs (2.1).

7. The integrated structure wind blade according to claim 2 or 4, characterized in that: The wind wheel disc (1) and the leaf connecting plate (1.2), or the wind wheel disc (1) and the wind wheel disc fin (1.3) are provided with wind wheel disc reinforcing ribs (1.4).

8. The integrated structure wind blade according to any one of claims 1 to 6, characterized in that: It further includes a wind blade reinforcing disc (3), and a reinforcing disc mounting hole (3.1) corresponding to the wind wheel disc mounting hole (1.1) is provided in the middle of the wind blade reinforcing disc (3); the wind wheel disc (1) is fixedly connected to the wind blade reinforcing disc (3).

9. The integrated structure wind blade according to claim 8, characterized in that: A plurality of hemming grooves (3.2) are evenly arranged around the center of the periphery of the wind blade reinforcing disc (3), and the inner root of the wind blade (2) is arranged in the hemming groove (3.2).

10. A centrifugal fan, characterized in that: The centrifugal fan adopts the wind blade with the integrated structure described in any one of claims 1 to 9.

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