Bearing mounting structure and fan

Abstract

The utility model discloses a bearing mounting structure and fan, bearing mounting structure includes outer frame, bearing column, upper bearing and lower bearing, and the outer frame is equipped with the medium pipe, and the inner pipe diameter of medium pipe is same from top to bottom, and bearing column, upper bearing and lower bearing are located in the medium pipe, and the medium pipe, upper bearing, lower bearing and bearing column all are located on same axis. Through the medium pipe is designed into the structure of the inner pipe diameter same from top to bottom, and utilize bearing column and divide the position of installing upper bearing and lower bearing in the medium pipe, avoided the error problem caused by setting up the hole of installing upper bearing and lower bearing respectively in the both ends of medium pipe, guaranteed the concentricity after the installation of upper bearing and lower bearing.

Description

Technical Field

[0001] This utility model relates to the field of fan technology, and in particular to a bearing mounting structure and a fan. Background Technology

[0002] The fan frame's central tube is a crucial component for mounting bearings. During production, a boss is machined in the middle of the central tube, and two bearing mounting holes are machined near both ends of the central tube to install and limit the movement of the upper and lower bearings. Existing central tubes can be broadly divided into two types: metal and plastic. For metal central tubes, due to mature manufacturing processes, the precision of the upper and lower bearing mounting holes is generally high, ensuring the concentricity of the two bearings after installation. However, the cost is relatively high. While plastic central tubes are relatively cheaper than metal ones, the limitations of the plastic molding process itself cannot guarantee the precision of the upper and lower bearing mounting holes, meaning that the concentricity of the two bearings after installation cannot be guaranteed. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a bearing mounting structure and fan, which aims to solve the problem that the upper and lower bearings cannot be well concentric when using a low-cost plastic tube.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: On the one hand, this utility model provides a bearing mounting structure, including an outer frame, a bearing column, an upper bearing and a lower bearing. The outer frame is provided with a middle tube, and the inner diameter of the middle tube is the same from top to bottom. The bearing column, the upper bearing and the lower bearing are disposed inside the middle tube, and the middle tube, the upper bearing, the lower bearing and the bearing column are all located on the same axis.

[0005] Furthermore, the bearing post is cylindrical in shape, and the outer diameter of the bearing post is the same as the outer diameter of the upper bearing and the lower bearing.

[0006] Furthermore, the bearing column has a central through hole along its length, and the diameter of the central through hole is the same from top to bottom.

[0007] Furthermore, it also includes an elastic element, which is disposed between the upper bearing and the bearing post or between the lower bearing and the bearing post.

[0008] Furthermore, the elastic element is a return spring, which is coaxially arranged with the bearing post.

[0009] Furthermore, the outer diameter of the elastic element is the same as the outer diameter of the bearing column.

[0010] Furthermore, the central tube is injection molded from plastic material.

[0011] On the other hand, this utility model also provides a fan, including fan blades, iron core, rotating shaft and the above-mentioned bearing mounting structure. The iron core is disposed around the middle tube, the rotating shaft passes through the upper bearing, the bearing column and the lower bearing, and the top of the rotating shaft is connected to the fan blades.

[0012] Furthermore, the lower end of the rotating shaft is provided with a retaining ring, which abuts against the inner ring of the lower bearing.

[0013] Furthermore, the top edge of the middle tube is provided with an inner limiting edge, and the outer ring of the upper bearing abuts against the inner limiting edge.

[0014] The beneficial effects of this utility model compared with the prior art are as follows: A bearing mounting structure includes an outer frame, a bearing column, an upper bearing, and a lower bearing. The outer frame has a middle tube with the same inner diameter from top to bottom. The bearing column, upper bearing, and lower bearing are located inside the middle tube, and the middle tube, upper bearing, lower bearing, and bearing column are all located on the same axis. By designing the middle tube with the same inner diameter from top to bottom, and using the bearing column to divide the inside of the middle tube into positions for installing the upper and lower bearings, the error problem caused by opening holes at both ends of the middle tube to install the upper and lower bearings is avoided, ensuring the concentricity of the upper and lower bearings after installation.

[0015] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model, it can be implemented according to the contents of the specification. In order to make the above and other objectives, features and advantages of this utility model more obvious and easy to understand, the following are preferred embodiments, which are described in detail below. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of a fan provided for a specific embodiment of this utility model; Figure 2 An exploded view of a fan provided for a specific embodiment of this utility model; Figure 3 A cross-sectional view of a fan provided for a specific embodiment of this utility model; Figure 4A partial structural diagram of a bearing mounting structure provided for a specific embodiment of this utility model; Figure 5 This is a schematic diagram of the outer frame provided for a specific embodiment of the present utility model.

[0018] Figure Labels 1. Outer frame; 11. Middle tube; 111. Inner limiting edge; 2. Fan blade; 3. Bearing column; 31. Central through hole; 4. Upper bearing; 5. Lower bearing; 6. Elastic element; 7. Iron core; 8. Rotating shaft; 9. Buckle. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0021] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0022] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0023] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0024] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0025] like Figures 1 to 5 As shown, this utility model embodiment provides a bearing mounting structure, including an outer frame 1, a bearing column 3, an upper bearing 4 and a lower bearing 5. The outer frame 1 is provided with a middle tube 11, and the inner diameter of the middle tube 11 is the same from top to bottom. The bearing column 3, the upper bearing 4 and the lower bearing 5 are disposed inside the middle tube 11, and the middle tube 11, the upper bearing 4, the lower bearing 5 and the bearing column 3 are all located on the same axis.

[0026] Specifically, the outer frame 1 is integrally formed by injection molding using plastic material, that is, the middle tube 11 is made of plastic. The inner wall of the middle tube 11 is a continuous smooth cylindrical surface, and its inner diameter remains consistent from top to bottom. There are no bosses or stepped holes for direct installation and limiting bearings. This structural form of the middle tube 11 greatly reduces the requirements for the precision of the plastic mold and the injection molding process.

[0027] By manufacturing the plastic middle tube 11 into a smooth round tube with a uniform inner diameter, and transferring the axial positioning function of the upper bearing 4 and the lower bearing 5 to the high-precision independent bearing column 3, the coaxiality error that inevitably exists in the traditional plastic middle tube 11 due to the separate molding of bearing seats at both ends is fundamentally eliminated, ensuring that the upper bearing 4 and the lower bearing 5 have excellent concentricity. At the same time, since the middle tube 11 is made of plastic, the manufacturing cost is greatly reduced.

[0028] In such Figure 4 In the illustrated embodiment, the bearing post 3 is cylindrical in shape, having a continuous, smooth outer cylindrical surface with a standard circular cross-section. The outer diameter of the bearing post 3 is the same as that of the upper bearing 4 and the lower bearing 5. Because they share the same outer diameter, the outer surfaces of the upper bearing 4, bearing post 3, and lower bearing 5 can function as a single unit. During installation into the middle tube 11, they automatically use their common outer cylindrical surface as a reference to locate and position themselves on the central axis of the inner hole of the middle tube 11. This design effectively transforms the bearing post 3 into a more precise positioning reference, not only for separating and axially positioning the upper bearing 4 and the lower bearing 5, but also for radially guiding and ensuring that the mounting holes of the upper bearing 4 and the lower bearing 5 are on the same axis, thereby fundamentally eliminating concentricity errors caused by radial offset of the mounting positions of the two bearings (upper bearing 4 and lower bearing 5).

[0029] In such Figure 2 In the illustrated embodiment, the bearing post 3 has a central through hole 31 along its length. The diameter of the central through hole 31 is the same from top to bottom. This design provides a uniform radial clearance for the rotating shaft 8 passing through it, ensuring that the rotating shaft 8 is not subjected to any additional constraints or interference from the inside of the bearing post 3 caused by changes in hole diameter or stepped surfaces. The radial support of the rotating shaft 8 is entirely provided by the inner rings of the upper bearing 4 and the lower bearing 5, while the inner wall of the central through hole 31 remains in a non-contact state with the rotating shaft 8, further ensuring the high concentricity established by the upper bearing 4 and the lower bearing 5.

[0030] In some embodiments, the bearing mounting structure further includes an elastic element 6, which is disposed between the upper bearing 4 and the bearing column 3 or between the lower bearing 5 and the bearing column 3. The elastic element 6 can apply a continuous axial preload, which can automatically absorb and compensate for the manufacturing tolerances of the parts, assembly errors, and wear and thermal deformation caused by long-term operation, and always keep the upper bearing 4 and the lower bearing 5 in a pressed state, effectively preventing axial movement and improving the smoothness of operation.

[0031] In such Figure 3In the embodiment shown, the elastic element 6 is disposed between the lower bearing 5 and the bearing column 3. During operation, after the elastic element 6 is compressed, its restoring force pushes the outer ring of the lower bearing 5 downward and presses the bearing column 3 and the upper bearing 4 upward, thereby realizing axial preload and clearance compensation.

[0032] In such Figure 3 In the embodiment shown, the elastic element 6 is a return spring, which is coaxially arranged with the bearing column 3. In this way, the central axis of the return spring, the central axis of the bearing column 3, and the central axis of the central tube 11 coincide, ensuring that the force transmission of the return spring is always axial during compression and rebound, avoiding deviation, jamming, or the generation of radial component force.

[0033] In some embodiments, the outer diameter of the elastic element 6 is the same as the outer diameter of the bearing column 3. This design ensures the uniformity and continuity of the radial support reference, preventing minor eccentricity or tilting problems that may be caused by the mismatch of the radial dimensions of the elastic element 6.

[0034] like Figures 1 to 5 As shown, this utility model embodiment also provides a fan, including a fan blade 2, an iron core 7, a rotating shaft 8 and the above-mentioned bearing mounting structure. The iron core 7 is located on the periphery of the middle tube 11, and the rotating shaft 8 passes through the upper bearing 4, the bearing column 3 and the lower bearing 5. The top of the rotating shaft 8 is connected to the fan blade 2.

[0035] In some embodiments, the lower end of the rotating shaft 8 is provided with a retaining ring 9, which abuts against the inner ring of the lower bearing 5, thereby achieving axial limiting of the lower bearing 5. The top edge of the middle tube 11 is provided with an inner limiting edge 111, and the outer ring of the upper bearing 4 abuts against the inner limiting edge 111, thereby achieving axial limiting of the upper bearing 4.

[0036] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should all be covered within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A bearing mounting structure, characterized in that, It includes an outer frame, a bearing column, an upper bearing, and a lower bearing. The outer frame is provided with a middle tube, and the inner diameter of the middle tube is the same from top to bottom. The bearing column, the upper bearing, and the lower bearing are located inside the middle tube, and the middle tube, the upper bearing, the lower bearing, and the bearing column are all located on the same axis.

2. The bearing mounting structure according to claim 1, characterized in that, The bearing column is cylindrical in shape, and its outer diameter is the same as that of the upper bearing and the lower bearing.

3. The bearing mounting structure according to claim 1, characterized in that, The bearing column has a central through hole along its length, and the diameter of the central through hole is the same from top to bottom.

4. The bearing mounting structure according to claim 1, characterized in that, It also includes an elastic element, which is disposed between the upper bearing and the bearing post or between the lower bearing and the bearing post.

5. A bearing mounting structure according to claim 4, characterized in that, The elastic element is a return spring, which is coaxially arranged with the bearing column.

6. A bearing mounting structure according to claim 5, characterized in that, The outer diameter of the elastic element is the same as the outer diameter of the bearing column.

7. The bearing mounting structure according to claim 1, characterized in that, The central tube is injection molded from plastic material.

8. A fan, characterized in that, The device includes a fan blade, an iron core, a rotating shaft, and a bearing mounting structure as described in any one of claims 1-7. The iron core is disposed around the periphery of the central tube, and the rotating shaft passes through the upper bearing, the bearing column, and the lower bearing. The top of the rotating shaft is connected to the fan blade.

9. A fan according to claim 8, characterized in that, The lower end of the rotating shaft is provided with a retaining ring, which abuts against the inner ring of the lower bearing.

10. A fan according to claim 8, characterized in that, The top edge of the middle tube is provided with an inner limiting edge, and the outer ring of the upper bearing abuts against the inner limiting edge.

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