Fan structure of elastic prepressing single ball

Abstract

The utility model discloses a fan structure of an elastic prepressing single ball. The fan structure comprises a fan frame, fan blades, a shaft core, a ball bearing, a first limiting piece, a second limiting piece, an elastic supporting piece and a driving assembly. The fan frame is provided with a middle pipe, the fan blades are fixedly connected with the top end of the shaft core, a main body of the shaft core is arranged in the middle pipe in a penetrating mode, the ball bearing is arranged between the shaft core and the middle pipe, the first limiting piece is fixed to the top position in the middle pipe, and the second limiting piece is arranged at the bottom position of the shaft core. The elastic supporting piece is arranged at the bottom of the middle pipe, and the driving assembly is in driving connection with the fan blades. The first limiting piece and the second limiting piece are used for limiting the ball bearing in the middle pipe up and down; and pre-pressure is applied to the ball bearing through the elastic supporting piece, so that the running stability of the ball bearing is improved, and the service life of the ball bearing can be guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of cooling fan manufacturing and processing technology, specifically to a fan structure with elastic preloaded single ball bearing. Background Technology

[0002] In the electronics industry, the heat generated by electronic components during operation is immeasurable, especially electronic chips, which control the operation of the entire electronic system. Heat can severely damage the components themselves and accelerate the aging of surrounding devices, reducing their lifespan. Heat sinks have emerged to address this issue, and fans, as commonly used active heat dissipation components in heat sinks, are indispensable. They play a crucial role in the entire heat dissipation process, so the quality of the fan's structure and performance directly affects the heat dissipation performance of the heat sink.

[0003] Single ball bearings are a common fan structure in cooling fans. Because ball bearings are precision components, using a tight-fitting assembly method will significantly reduce their lifespan. However, if a tight-fitting assembly method is not used, the ball bearing is prone to displacement during operation. Alternatively, the stator and mover of the drive assembly can be offset axially to generate axial magnetic thrust to apply preload to the ball bearing, but this can lead to large vibrations and high magnetic losses. All of these situations can negatively impact the ball bearing, resulting in a reduced lifespan or causing vibration and abnormal noise in the fan blades, making it difficult to improve the fan's lifespan and performance. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of this utility model is to provide a fan structure with elastic preload single ball bearing, which can increase the stability of the ball bearing operation, ensure the service life of the ball bearing, and improve the performance of the fan.

[0005] The first technical solution of this utility model is as follows:

[0006] A fan structure with elastic preload single ball bearing includes: a fan frame, fan blades, a shaft core, ball bearings, a first limiting member, a second limiting member, an elastic support member, and a drive assembly. The fan frame has a central tube at its center, the inner cavity of which is closed at the bottom and extends through at the top. The top ends of the fan blades and the shaft core are fixedly connected. The main body of the shaft core passes through the central tube. The ball bearing is disposed between the shaft core and the central tube, and the ball bearing slides in cooperation with both the shaft core and the central tube. The first limiting member is fixed at the top position inside the central tube, and the second limiting member is disposed at the bottom position of the shaft core. The elastic support member is disposed at the bottom of the central tube, and the bottom end of the shaft core abuts against the top surface of the elastic support member. The drive assembly is disposed on the fan frame and is drivenly connected to the fan blades.

[0007] Furthermore, the first limiting component is an oil-impregnated bearing or a positioning ring.

[0008] Furthermore, the first limiting member and the inner wall of the middle tube are interference-fitted, and the inner diameter of the first limiting member is larger than the outer diameter of the shaft core.

[0009] Furthermore, the second limiting member is a buckle, and the bottom end of the shaft is provided with a locking block, which cooperates with the buckle.

[0010] Furthermore, a circumferentially extending movable groove is provided above the card block, so that the top surface of the card block forms a support surface. The inner diameter of the buckle is smaller than the outer diameter of the card block. The buckle has multiple radially extending through grooves from its inner ring, and the multiple through grooves are arranged in an array.

[0011] Furthermore, the card block is hemispherical.

[0012] Furthermore, the elastic support is a spherical spring sheet, which is disposed at the bottom of the central tube, and the shaft abuts against the top of the spherical spring sheet.

[0013] Furthermore, the elastic support includes a cylindrical spring and a wear-resistant plate. The cylindrical spring is disposed at the bottom of the central tube, the wear-resistant plate is disposed at the top of the cylindrical spring, and the shaft core abuts against the wear-resistant plate.

[0014] Furthermore, the drive assembly includes a mover and a stator, the mover being disposed on the fan blade, the stator being disposed outside the central tube, and the center of the magnet of the mover and the center of the silicon steel sheet of the stator being on the same radial plane.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] By designing the first limiting member inside the central tube and the second limiting member on the shaft core, the ball bearing inside the central tube is limited in both upward and downward positions. Furthermore, the preload applied to the ball bearing by the elastic support member causes the first and second limiting members to elastically clamp the upper and lower sides of the ball bearing, thereby increasing the stability of the ball bearing operation, ensuring the service life of the ball bearing, and improving the performance of the fan. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional view of the fan structure in this utility model;

[0019] Figure 2 This is a partial cross-sectional view of the central tube in this utility model;

[0020] Figure 3 This is a schematic diagram of the fit between the shaft and the retaining ring of this utility model;

[0021] Figure 4 This is a partial enlarged view of the elastic support member (spherical spring sheet) in one embodiment of this utility model.

[0022] Figure 5 This is a partially enlarged view of an elastic support member (cylindrical spring with wear-resistant sheet) in one embodiment of this utility model.

[0023] Explanation of reference numerals: 1-fan frame; 11-middle tube; 2-fan blade; 3-shaft core; 31-block; 301-moving groove; 4-ball bearing; 5-first limiting component; 6-second limiting component; 61-ring; 601-through groove; 7-elastic support component; 71-spherical spring sheet; 72-cylindrical spring; 73-wear-resistant sheet; 81-moving element; 82-stator. Detailed Implementation

[0024] To facilitate a better understanding of the purpose, structure, features, and effects of this utility model, it will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that the features shown in the figures are not necessarily drawn to scale. Furthermore, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0025] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," "right," "front," and "back" are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] like Figure 1-2 As shown, this embodiment provides a fan structure with elastic preload single ball bearing, including: fan frame 1, fan blade 2, shaft core 3, ball bearing 4, first limiting member 5, second limiting member 6, elastic support member 7, and drive assembly;

[0027] The fan frame 1 has a central tube 11 at its center. The bottom of the inner cavity of the central tube 11 is closed and the top is through. The top ends of the fan blade 2 and the shaft core 3 are fixedly connected. The main body of the shaft core 3 passes through the central tube 11. The ball bearing 4 is disposed between the shaft core 3 and the central tube 11. The ball bearing 4 slides in cooperation with the shaft core 3 and the central tube 11 respectively.

[0028] The first limiting member 5 is fixed at the top position inside the middle tube 11 to limit the upper part of the ball bearing 4, and the second limiting member 6 is disposed at the bottom position of the shaft core 3 to provide support for the lower part of the ball bearing 4.

[0029] The elastic support 7 is disposed at the bottom of the middle tube 11, the bottom end of the shaft core 3 abuts against the top surface of the elastic support 7, and the elastic support 7 provides an upward preload to the ball bearing 4, so that the top end of the ball bearing 4 abuts against the first limiting member 5.

[0030] The drive component is mounted on the fan frame 1 and is driven to connect with the fan blade 2.

[0031] By designing the first limiting member 5 inside the central tube 11 and the second limiting member 6 on the shaft core 3, the ball bearing 4 is positioned vertically within the central tube 11. Furthermore, the pre-pressure applied to the ball bearing 4 by the elastic support member 7 causes the first limiting member 5 and the second limiting member 6 to elastically clamp the upper and lower sides of the ball bearing 4, thereby increasing the operational stability of the ball bearing 4, ensuring its service life, and improving the fan's performance.

[0032] like Figure 1 As shown, as a preferred embodiment, the first limiting member 5 is an oil-impregnated bearing or a positioning ring; specifically, the first limiting member 5 and the inner wall of the middle tube 11 are interference-fitted, and the inner diameter of the first limiting member 5 is larger than the outer diameter of the shaft core 3. In this way, the ball bearing 4 is limited while the shaft core 3 can move up and down within the first limiting member 5. A specific accessory of the first limiting member 5 can be selected based on factors such as cost, performance and lifespan.

[0033] like Figure 3 As shown, in a preferred embodiment, the second limiting member 6 is a retaining ring 61, and the bottom end of the shaft core 3 is provided with a locking block 31. The locking block 31 and the retaining ring 61 cooperate to provide support for the ball bearing 4.

[0034] like Figure 3 As shown, further, a circumferentially extending movable groove 301 is provided above the locking block 31, so that the top surface of the locking block 31 forms a support surface. The inner diameter of the buckle 61 is smaller than the outer diameter of the locking block 31. The buckle 61 has multiple radially extending through grooves 601 from its inner ring, and the multiple through grooves 601 are arranged in an array. During assembly, the locking block 31 is passed through the buckle 61, so that the buckle 61 is placed in the movable groove 301 and abuts against the support surface, which facilitates assembly and positioning.

[0035] like Figure 1 As shown, preferably, the locking block 31 is hemispherical, which facilitates the assembly of the locking block 31 with the buckle 61 and reduces the contact area between the locking block 31 and the elastic support 7, thereby reducing the friction between the shaft core 3 and the elastic support 7 when the shaft core 3 rotates.

[0036] like Figure 4 As shown, in a preferred embodiment, the elastic support 7 is a spherical spring sheet 71, which is disposed at the bottom of the central tube 11, and the shaft core 3 abuts against the top of the spherical spring sheet 71, so that the locking block 31 and the top of the spherical spring sheet 71 make point-to-point contact, thereby reducing friction.

[0037] like Figure 5 As shown, in another preferred embodiment, the elastic support 7 includes a cylindrical spring 72 and a wear-resistant plate 73. The cylindrical spring 72 is disposed at the bottom of the central tube 11, and the wear-resistant plate 73 is disposed at the top of the cylindrical spring 72. The shaft core 3 abuts against the wear-resistant plate 73. The cylindrical spring 72 can achieve pre-pressure correction to further improve stability. The contact between the locking block 31 and the wear-resistant plate 73 can reduce friction. A specific component of the elastic support 7 can be selected based on factors such as cost, performance, and lifespan.

[0038] like Figure 1 As shown, in a preferred embodiment, the drive assembly includes a mover 81 and a stator 82. The mover 81 is disposed on the fan blade 2, and the stator 82 is disposed on the outside of the central tube 11. The center of the magnet of the mover 81 and the center of the silicon steel sheet of the stator 82 are on the same radial plane. This reduces the axial resistance between the magnet on the fan blade 2 and the silicon steel sheet of the stator 82 when the fan is running, effectively improving the flexibility of the fan blade 2.

[0039] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A fan structure with elastic preloaded single ball bearing, characterized in that, include: The fan frame (1), fan blade (2), shaft core (3), ball bearing (4), first limiting member (5), second limiting member (6), elastic support member (7), and drive assembly are provided. The fan frame (1) has a central tube (11) at its center. The bottom of the inner cavity of the central tube (11) is closed, and the top of the central tube (11) is through. The top ends of the fan blade (2) and the shaft core (3) are fixedly connected. The main body of the shaft core (3) passes through the central tube (11). The ball bearing (4) is located between the shaft core (3) and the central tube (11). Between the ball bearings (4) and the shaft core (3), the ball bearings (4) and the shaft core (3) are slidably engaged with the middle tube (11); the first limiting member (5) is fixed at the top position inside the middle tube (11), and the second limiting member (6) is located at the bottom position of the shaft core (3); the elastic support member (7) is located at the bottom of the middle tube (11), and the bottom end of the shaft core (3) abuts against the top surface of the elastic support member (7); the drive assembly is located on the fan frame (1) and is drivenly connected to the fan blade (2).

2. The fan structure with elastic preloaded single ball bearing as described in claim 1, characterized in that, The first limiting component (5) is an oil-impregnated bearing or a positioning ring.

3. The fan structure with elastic preloaded single ball bearing according to claim 2, characterized in that, The first limiting member (5) and the inner wall of the middle tube (11) are interference-fitted, and the inner diameter of the first limiting member (5) is greater than the outer diameter of the shaft core (3).

4. The fan structure with elastic preloaded single ball bearing according to claim 1, characterized in that, The second limiting member (6) is a buckle (61), and the bottom end of the shaft core (3) is provided with a locking block (31), which cooperates with the buckle (61).

5. The fan structure with elastic preloaded single ball bearing according to claim 4, characterized in that, The card block (31) has a circumferentially extending movable groove (301) on its upper part, so that the top surface of the card block (31) forms a support surface. The inner diameter of the buckle (61) is smaller than the outer diameter of the card block (31). The buckle (61) has multiple radially extending through grooves (601) from its inner ring. The multiple through grooves (601) are arranged in an array.

6. The fan structure with elastic preloaded single ball bearing according to claim 5, characterized in that, The card block (31) is hemispherical.

7. The fan structure with elastic preloaded single ball bearing according to claim 1, characterized in that, The elastic support (7) is a spherical spring sheet (71), which is located at the bottom of the central tube (11), and the shaft core (3) abuts against the top of the spherical spring sheet (71).

8. The fan structure with elastic preloaded single ball bearing according to claim 1, characterized in that, The elastic support (7) includes a cylindrical spring (72) and a wear-resistant plate (73). The cylindrical spring (72) is located at the bottom of the central tube (11), and the wear-resistant plate (73) is located at the top of the cylindrical spring (72). The shaft core (3) abuts against the wear-resistant plate (73).

9. The fan structure with elastic preloaded single ball bearing according to claim 1, characterized in that, The drive assembly includes a mover (81) and a stator (82). The mover (81) is disposed on the fan blade (2), and the stator (82) is disposed outside the middle tube (11). The center of the magnet of the mover (81) and the center of the silicon steel sheet of the stator (82) are on the same radial plane.

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