Fan blade assembly and motor fan

Abstract

The invention discloses a fan blade assembly and a motor fan, the fan blade assembly comprises a fan blade main body, a magnet yoke and a rotating shaft which are integrally formed through plastic coating, the fan blade main body comprises a mounting cavity and a fixing column, the magnet yoke is arranged on the inner wall of the mounting cavity, the rotating shaft is arranged in the magnet yoke and located at the axis of the magnet yoke, and the fixing column is arranged in the mounting cavity. The fixing column penetrates into the magnet yoke and wraps one end of the rotating shaft, so that the rotating shaft is fixed to the axis of the magnet yoke. The fan blade assembly is manufactured in an integrated plastic coating mode, so that the influence of overall balance and consistency caused by rear pressing-in of the magnet yoke in the prior art can be reduced, meanwhile, the fixing column penetrates into the magnet yoke and wraps one end of the rotating shaft, the stress of the rotating shaft after stress is released through the toughness of the fixing column, and the stability of the rotating shaft is improved. Therefore, local deformation of the magnet yoke cannot be caused in a stress area, the area where the bottom of the fan blade body cup shrinks and deforms can be reduced, and finally the influence on the perpendicularity of a rotating shaft after the fan blade is stressed is controlled and reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the fan technical field, specifically relates to a fan blade assembly and motor fan. BACKGROUND

[0002] The fan blade assembly of the existing refrigerator evaporator motor fan is composed of a magnetic yoke, a rotating shaft, a fan blade body and a magnetic steel. In the manufacturing process, the fan blade body and the rotating shaft are first fixed together in an integrated plastic package, and then the magnetic yoke and the magnetic steel are pressed into the fan blade body, thereby manufacturing the fan blade assembly.

[0003] However, the existing fan blade assembly has the following problems: the fan blade cup bottom is relatively large, which is easily affected by factors such as injection molding process, resulting in that the rotating shaft is not perpendicular to the fan blade cup bottom; the magnetic yoke is in a rear pressing form, which requires very high process equipment guarantee, easily leading to poor dynamic balance and consistency, and increasing the labor cost of adjusting the fan blade dynamic balance. SUMMARY

[0004] In order to overcome the problems existing in the prior art, the main purpose of the present application is to provide a fan blade assembly capable of improving overall balance and consistency.

[0005] In order to achieve the above purpose, the following technical solutions are specifically adopted in the present application:

[0006] The present application provides a fan blade assembly, which comprises:

[0007] a fan blade body, a magnetic yoke and a rotating shaft formed by integrated plastic packaging;

[0008] The fan blade body comprises a mounting cavity and a fixing column;

[0009] The magnetic yoke is arranged on the inner wall of the mounting cavity;

[0010] The rotating shaft is arranged in the magnetic yoke and located at the axis of the magnetic yoke, and the fixing column penetrates into the magnetic yoke and covers one end of the rotating shaft, so that the rotating shaft is fixed at the axis of the magnetic yoke.

[0011] In some embodiments, one end of the magnetic yoke is provided with an opening, the other end of the magnetic yoke is provided with a through hole, one end of the rotating shaft penetrates out of the magnetic yoke through the through hole, and the fixing column penetrates into the magnetic yoke through the through hole and covers one end of the rotating shaft.

[0012] In some embodiments, the diameter of the through hole is D, and 17mm≤D≤26mm.

[0013] In some embodiments, the fixing column comprises a first step portion, a second step portion and a third step portion, the first step portion, the second step portion and the third step portion are sequentially arranged in the direction of the opening pointing to the through hole, and the diameter of the first step portion is W1, the diameter of the second step portion is W2, and the diameter of the third step portion is W3, W1 < W2 < W3.

[0014] In some embodiments, the fan blade body further comprises a reinforcing rib, the reinforcing rib is connected to the third step portion, and the reinforcing rib protrudes relative to the surface of the third step portion.

[0015] In some embodiments, a plurality of reinforcing ribs are provided, and the plurality of reinforcing ribs are uniformly distributed along the circumference of the third step portion.

[0016] In some embodiments, each of the reinforcing ribs extends towards the inner wall of the through hole, and one end of the reinforcing rib extending towards the inner wall of the through hole is flush with the bottom wall of the yoke.

[0017] In some embodiments, the reinforcing rib is in a linear shape, a spiral shape, an arc shape, a sine wave shape, a snake shape, a square wave shape, a triangular wave shape or a sawtooth wave shape.

[0018] In some embodiments, the distance of the fixing column penetrating into the yoke is L, 5mm ≤ L ≤ 8mm.

[0019] In some embodiments, the surface of the part of the rotating shaft covered by the fixing column is provided with a recess and / or a protrusion, or the surface of the part of the rotating shaft covered by the fixing column is a rough surface.

[0020] Correspondingly, the application also provides an electric motor fan, which comprises a magnetic steel, a stator and the fan blade assembly of any one of the above embodiments, the magnetic steel is arranged in the yoke, and the stator cooperates with the yoke to drive the fan blade assembly to rotate.

[0021] The fan blade assembly of the application comprises a fan blade body, a yoke and a rotating shaft formed by one-piece plastic covering, the fan blade body comprises a mounting cavity and a fixing column, the yoke is arranged on the inner wall of the mounting cavity, the rotating shaft is arranged in the yoke and located at the axis of the yoke, the fixing column penetrates into the yoke and covers one end of the rotating shaft, so that the rotating shaft is fixed at the axis of the yoke. Compared with the prior art, the fan blade assembly of the application is made by one-piece plastic covering, so as to reduce the influence of the overall balance and consistency caused by the rear pressure of the yoke in the prior art. At the same time, by making the fixing column penetrate into the yoke and cover one end of the rotating shaft, the flexibility of the fixing column is used to release the stress of the rotating shaft after being stressed, so that the local deformation of the yoke in the stressed area is also avoided, and the area of the cup bottom of the fan blade body which is shrunk and deformed is reduced, so as to finally control and reduce the influence of the fan blade after being stressed on the perpendicularity of the rotating shaft. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A rear view of the fan blade assembly provided by the embodiment of the present application.

[0023] Figure 2 A side view of the fan blade assembly provided by the embodiment of the present application.

[0024] Figure 3 A front view of the fan blade assembly provided by the embodiment of the present application.

[0025] Figure 4 A sectional view at A-A in Figure 3

[0026] Figure 5 A perspective exploded view of the fan blade assembly provided by the embodiment of the present application.

[0027] Figure 6 A perspective view of the rotating shaft in Figure 5

[0028] The drawings identify:

[0029] 1, fan blade body; 11, body; 111, first side surface; 112, second side surface; 12, fan blade; 13, mounting cavity; 14, fixing column; 141, first step portion; 142, second step portion; 143, third step portion; 15, reinforcing rib; 2, magnetic yoke; 21, opening; 22, through hole; 3, rotating shaft; 31, recess; 100, fan blade assembly. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0031] In the description of the present application, unless explicitly defined and limited, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" means two or more, and the term "multiple" means two or more; the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "connection" can be fixed connection, or detachable connection, or integral connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] ​​In the description of this specification, it should be understood that the directional terms such as "upper" and "lower" used in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should also be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0033] Reference Figures 1 to 5 As shown, Figure 1 A rear view of the fan blade assembly provided in an embodiment of this application; Figure 2 A side view of the fan blade assembly provided in an embodiment of this application; Figure 3 A front view of the fan blade assembly provided in an embodiment of this application; Figure 4 for Figure 3 Sectional view at point AA; Figure 5 This is an exploded perspective view of the fan blade assembly provided in an embodiment of this application. The fan blade assembly 100 includes a fan blade body 1, a magnetic yoke 2, and a rotating shaft 3. The fan blade body 1 includes a mounting cavity 13 and a fixing post 14. The magnetic yoke 2 is disposed on the inner wall of the mounting cavity 13, and the rotating shaft 3 is disposed within the magnetic yoke 2 and located at the axis of the magnetic yoke 2. The fixing post 14 passes through the magnetic yoke 2 and covers one end of the rotating shaft 3, thereby fixing the rotating shaft 3 at the axis of the magnetic yoke 2. The fan blade body 1 is made of plastic injection molding, and the plastic can be polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), or acrylonitrile-butadiene-styrene copolymer (ABS), etc. The magnetic yoke 2 and the rotating shaft 3 are made of metal, and the plastic at least partially covers the magnetic yoke 2 and the rotating shaft 3 during injection molding, that is, the fan blade body, the magnetic yoke, and the rotating shaft are integrally molded by plastic encapsulation.

[0034] Specifically, the fan blade body 1 includes a body 11 and a fan blade 12. The body 11 has a first side 111 and a second side 112 arranged opposite to each other. The first side 111 is provided with a mounting cavity 13, and the fan blade 12 is connected to the second side 112. The magnetic yoke 2 has a hollow cylindrical structure, and one end of the magnetic yoke 2 is provided with an opening 21, and the other end of the magnetic yoke 2 is provided with a through hole 22. One end of the rotating shaft 3 passes through the through hole 22 and exits from the magnetic yoke 2. The fixing post 14 passes through the through hole 22 and enters the magnetic yoke 2 and covers one end of the rotating shaft 3.

[0035] In some embodiments, the distance by which the fixing post 14 penetrates the magnetic yoke 2 is L, that is, the distance between the end of the fixing post 14 away from the through hole 22 and the bottom wall of the magnetic yoke 2 is L, 5mm≤L≤8mm, and L can specifically be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, etc.

[0036] In some embodiments, the fixing post 14 has a stepped structure, specifically including a first stepped portion 141, a second stepped portion 142, and a third stepped portion 143. The first stepped portion 141, the second stepped portion 142, and the third stepped portion 143 are sequentially arranged along the direction from the opening 21 of the yoke 2 to the through hole 22. The diameter of the first stepped portion is W1, the diameter of the second stepped portion is W2, and the diameter of the third stepped portion is W3, where W1 < W2 < W3. Among them, 4 mm ≤ W1 ≤ 6 mm, and W1 can specifically be 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, etc.; 5 mm ≤ W2 ≤ 8 mm, and W2 can specifically be 5 mm, 5.5 mm, 6 mm, 6.4 mm, 7 mm, 7.5 mm, 8 mm, etc.; 6 mm ≤ W3 ≤ 9 mm, and W3 can specifically be 6 mm, 6.5 mm, 7 mm, 7.5 mm, 7.8 mm, 8 mm, 8.5 mm, 9 mm, etc.

[0037] In some embodiments, the distance between the stepped surface of the first stepped portion 141 and the stepped surface of the second stepped portion 142 is L1, where 2 mm ≤ L1 ≤ 4 mm, and L1 can specifically be 2 mm, 2.3 mm, 2.6 mm, 2.9 mm, 3.2 mm, 3.5 mm, 3.8 mm, 4 mm, etc.; the distance between the stepped surface of the second stepped portion 142 and the stepped surface of the third stepped portion 143 is L2, where 1 mm ≤ L2 ≤ 2 mm, and L2 can specifically be 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm. The distance between the stepped surface of the third stepped portion 143 and the bottom wall of the yoke 2 is L3, where 1.5 mm ≤ L3 ≤ 3.5 mm, and L3 can specifically be 1.5 mm, 1.8 mm, 2.1 mm, 2.4 mm, 2.7 mm, 3 mm, 3.3 mm, 3.5 mm, etc.

[0038] [[ID=�]]In some embodiments, the diameter of the through hole 22 is D, where 17 mm ≤ D ≤ 26 mm, and D can specifically be 17 mm, 18 mm, 19 mm, 20 mm, 21 mm, 22 mm, 23 mm, 24 mm, 25 mm, 26 mm, etc. Preferably, the diameter D of the through hole 22 is 20 mm. Through verification, setting the diameter D of the through hole 22 to 20 mm can make the shrinkage deformation of the plastic in the through hole 22 and the fixing strength of the rotating shaft 3 optimal, better control the flatness of the plastic in the through hole 22, ensure the perpendicularity of the rotating shaft 3, and improve the overall dynamic balance quality of the fan blade assembly. As the diameter D of the through hole 22 increases, the injection shrinkage deformation of the plastic in the through hole 22 will also increase, affecting the perpendicularity of the rotating shaft 3; as the diameter D of the through hole 22 decreases, the fixing strength of the plastic in the through hole 22 on the rotating shaft 3 is insufficient.

[0039] This application manufactures the fan blade assembly using a one-piece plastic coating to reduce the impact on overall balance and consistency caused by the subsequent pressing of the magnetic yoke in existing technologies. However, factors such as injection molding and material shrinkage can affect the dynamic balance of the fan blade assembly. Furthermore, under actual operating conditions, when the shaft is subjected to pressure or impact from the outer ring of the fan blades, stress concentrates in a localized area at the root of the plastic-coated shaft. Unreleased stress leads to changes in the shaft's verticality, increased fan blade oscillation, and increased imbalance, resulting in increased user complaints regarding noise. This application addresses this by inserting a fixing post 14 into the magnetic yoke 2 and covering one end of the shaft 3. The toughness of the fixing post 14 releases the stress on the shaft 3 under load, preventing local deformation of the magnetic yoke 2 in the stressed area. It also minimizes the area of ​​plastic shrinkage and deformation at the bottom of the fan blade body 1, thus controlling and reducing the impact of the fan blade 12 on the verticality of the shaft 3 under load.

[0040] Continue to refer to Figure 1 As shown, the fan blade body 1 also includes a reinforcing rib 15, which is connected to the third step portion 143 of the fixing column 14, and the reinforcing rib 15 protrudes relative to the surface of the third step portion 143. In the prior art, the fixing column with a plastic-coated recessed structure at the root of the shaft is small, and the overall strength of the shaft is weak. This application improves the load-bearing strength of the fixing column 14 by providing a reinforcing rib 15 and thickening and enlarging the fixing column 14, thereby improving the connection strength between the shaft 3 and the fixing column 14. While ensuring the perpendicularity of the shaft 3, it also improves the dynamic balance quality of the fan blade body 1 and reduces the manual cost of balancing.

[0041] Specifically, there are multiple reinforcing ribs 15, which are evenly distributed around the third step portion 143 along the circumference of the fixed column 14, and each reinforcing rib 15 extends toward the inner wall of the through hole 22, with one end of the reinforcing rib 15 extending toward the inner wall of the through hole 22 flush with the bottom wall of the magnetic yoke 2.

[0042] In this embodiment, the reinforcing ribs 15 are distributed in a straight line. It can be understood that in other embodiments, the reinforcing ribs 15 may also be spiral, arc, sine wave, snake, square wave, triangular wave or sawtooth wave, etc.

[0043] This application provides a through hole 22 of appropriate diameter on the magnetic yoke 2, and encapsulates the magnetic yoke 2 entirely with plastic injection molding. This allows the plastic's toughness to release the stress on the shaft 3 after being subjected to force, and also prevents the magnetic yoke 2 from deforming locally in the stressed area. Furthermore, it minimizes the area of ​​plastic shrinkage and deformation at the bottom of the fan blade body 1, ultimately controlling and reducing the impact of the fan blade 12 on the perpendicularity of the shaft 3 after being subjected to force.

[0044] Reference Figure 6 As shown, Figure 6 forFigure 5 A perspective view of the rotating shaft. The surface of the portion of the rotating shaft 3 covered by the fixing post 14 has multiple recesses 31. In this embodiment, by making the surface of the portion of the rotating shaft 3 covered by the fixing post 14 have a recessed structure, the surface of the portion of the rotating shaft 3 covered by the fixing post 14 is uneven, thereby making the connection between the rotating shaft 3 and the fixing post 14 more stable and ensuring that the rotating shaft 3 can still maintain its perpendicularity when subjected to external force. It can be understood that in other embodiments, the surface of the rotating shaft 3 covered by the fixing post 14 may also have multiple protrusions, or the surface of the rotating shaft 3 covered by the fixing post 14 may also be a rough surface.

[0045] Accordingly, this application also discloses a motor fan, which includes a motor body, a stator, a magnet, and a fan blade assembly as described in any of the above embodiments. The magnet is disposed in the magnetic yoke 2, the stator is disposed in the motor body, and the stator cooperates with the magnet. The motor body drives the stator and the magnet to work, thereby driving the fan blade assembly to rotate.

[0046] Specifically, after the magnet is pressed into the yoke 2 and magnetized, the stator drives the magnet to rotate, thereby driving the fan blade assembly to rotate.

[0047] In the prior art, the shaking and vibration of the fan blade assembly during rotation are caused by the imbalance of the fan blade assembly, which is generally caused by the inherent imbalance of the fan blade assembly itself. Simultaneously, the perpendicularity of the shaft 3 will change under a large external force, causing the fan blade assembly to wobble, shake, and vibrate during rotation. This application effectively enhances the ability of the shaft 3 to withstand external impacts and utilizes the plastic resilience of the fixing column 14 covering the shaft 3 to release the stress applied by the external force, thereby reducing the impact on the perpendicularity of the shaft 3. This results in higher overall strength and stronger dynamic balance stability of the motor fan.

[0048] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A vane assembly, comprising: The application relates to a fan blade assembly. The fan blade body, the magnetic yoke and the rotating shaft are integrally formed by plastic injection molding; The fan blade body comprises a mounting cavity and a fixing column; The magnetic yoke is arranged on the inner wall of the mounting cavity; The rotating shaft is arranged in the magnetic yoke and located at the axis of the magnetic yoke, the fixing column penetrates into the magnetic yoke and covers one end of the rotating shaft, and the rotating shaft is fixed at the axis of the magnetic yoke.

2. The leaf assembly of claim 1, wherein, One end of the magnetic yoke is provided with an opening, the other end of the magnetic yoke is provided with a through hole, one end of the rotating shaft penetrates out of the magnetic yoke through the through hole, and the fixing column penetrates into the magnetic yoke through the through hole and covers one end of the rotating shaft.

3. The leaf assembly of claim 2, wherein, The diameter of the through hole is D, and 17mm<=D<=26mm.

4. The leaf assembly of claim 2, wherein, The fixing column comprises a first step portion, a second step portion and a third step portion, the first step portion, the second step portion and the third step portion are sequentially arranged along the direction in which the opening points to the through hole, the diameter of the first step portion is W1, the diameter of the second step portion is W2, the diameter of the third step portion is W3, and W1<W2<W3.

5. The leaf assembly of claim 4, wherein, The fan blade body further comprises a reinforcing rib, the reinforcing rib is connected to the third step portion, and the reinforcing rib protrudes relative to the surface of the third step portion.

6. The leaf assembly of claim 5, wherein, A plurality of reinforcing ribs are uniformly distributed along the circumference of the third step portion.

7. The leaf assembly of claim 5, wherein, Each reinforcing rib extends towards the inner wall of the through hole, and one end of the reinforcing rib extending towards the inner wall of the through hole is flush with the bottom wall of the magnetic yoke.

8. The leaf assembly of claim 5, wherein, The reinforcing rib is in a straight line shape, a spiral shape, an arc shape, a sine wave shape, a snake shape, a square wave shape, a triangular wave shape or a sawtooth wave shape.

9. The leaf assembly of claim 1, wherein, The distance between the fixing column and the magnetic yoke is L, and 5mm<=L<=8mm.

10. The leaf assembly of claim 1, wherein, The surface of the part of the rotating shaft covered by the fixing column is provided with a concave portion and / or a convex portion, or the surface of the part of the rotating shaft covered by the fixing column is a rough surface.

11. An electric motor fan characterized by The application further relates to a fan, which comprises a magnetic steel, a stator and the fan blade assembly. The magnetic steel is arranged on the magnetic yoke, and the stator cooperates with the magnetic yoke to drive the fan blade assembly to rotate.

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