A vibration-resistant ball bearing fan structure

Abstract

The utility model discloses a kind of vibration-resistant ball bearing fan structures, annular frame step is equipped in fan frame inner side, power component is equipped on fan frame, middle tube is equipped in power component inner sleeve, it is rotatably connected in middle tube with fan blade axis, fan blade axis upper end is connected with fan blade group adaptation, spring is equipped on fan blade axis upper sleeve, spring upper end is located in fan blade group inner side, annular fan blade upper step is equipped in fan blade group inner side around fan blade axis, fan blade upper step and middle tube top are not contacted and form first gap;Fan blade group inner side lower end is equipped with annular fan blade lower step, fan blade lower step and frame step are not contacted and form second gap. When axial relative violent motion occurs, first gap and second gap absorb impact force brought by fan axial violent motion, at this time, spring pitch has space;Avoid the impact ball bearing after spring compression to bottom in middle ball bearing, so protect ball bearing from damage.

Description

Technical Field

[0001] This utility model relates to the technical field of cooling fan devices, and in particular to a vibration-resistant ball bearing fan structure. Background Technology

[0002] The requirements for automotive fans are becoming increasingly stringent. While meeting cooling requirements, higher demands are being placed on fan noise levels, especially at low speeds. Furthermore, automotive fans operate dynamically, making vibration tolerance even more stringent. Regardless of whether the fan operates at high or low speeds, vibration resistance is paramount. However, small ball bearings are products of high-precision manufacturing, leading to a mismatch between their operating conditions and the requirements of automotive fans. Existing ball bearing fans often experience performance instability, increased noise, or even damage when exposed to the continuous vibrations of the automotive environment, severely impacting the normal operation and lifespan of automotive equipment.

[0003] To address this issue, it is necessary to develop a vibration-resistant ball bearing fan structure that effectively improves the fan's stability and durability in vibration environments, thereby minimizing the impact of vibration on fan performance. This represents a direction for further improvement. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a vibration-resistant ball bearing fan structure.

[0005] This utility model provides the following technical solution: a vibration-resistant ball bearing fan structure, including a fan frame, a frame step, a power component, a central tube, a fan blade shaft, a fan blade assembly, and a spring. The fan frame has an annular frame step on its inner side. The fan frame is equipped with a power component. The central tube is fitted inside the power component and is rotatably connected to the fan blade shaft. The upper end of the fan blade shaft is adapted to the fan blade assembly. A spring is fitted on the fan blade shaft, and the upper end of the spring abuts against the inner side of the fan blade assembly.

[0006] Preferably, two ball bearings are spaced apart on the fan blade shaft, and the outer wall of the ball bearing is connected to the middle tube; the upper end of the upper ball bearing is in contact with the lower end of the spring, and the lower end of the lower ball bearing is in contact with the fan frame.

[0007] Preferably, the inner side of the fan blade assembly is provided with an annular upper step around the fan blade axis, and the upper step of the fan blade does not contact the top of the central tube and forms a first gap.

[0008] Preferably, the lower inner end of the fan blade assembly is provided with an annular fan blade lower step, and the fan blade lower step does not contact the frame step and forms a second gap.

[0009] Preferably, the radial projection edge of the lower end face of the fan blade step is at 1 / 2 of the frame step.

[0010] Preferably, the distance between the first gap and the second gap is equal, and the distance between the first gap and the second gap is less than the pitch of the spring after it is compressed.

[0011] Compared with existing technologies, the beneficial effects of this utility model are: (1) The present invention has an annular frame step on the inner side of the fan frame, a power component on the fan frame, a middle tube inside the power component, and a fan blade shaft rotatably connected inside the middle tube. The upper end of the fan blade shaft is adapted to the fan blade assembly. A spring is sleeved on the fan blade shaft, and the upper end of the spring abuts against the inner side of the fan blade assembly. An annular upper fan blade step is provided around the fan blade shaft on the inner side of the fan blade assembly. The upper fan blade step does not contact the top of the middle tube and forms a first gap. An annular lower fan blade step is provided at the lower end of the inner side of the fan blade assembly. The lower fan blade step does not contact the frame step and forms a second gap. When axial relative violent movement occurs, the first points of contact between the fan blade assembly and the fan frame are the first gap formed between the top of the central tube and the upper step of the fan blade, and the second gap formed between the lower step of the fan blade and the frame step. These two points initially absorb the impact force brought by the violent axial movement of the fan. At this time, the spring pitch still has space, preventing the ball bearing in the middle from being impacted after the spring is fully compressed. This protects the ball bearing from damage and achieves vibration resistance. At the same time, the radial projection edge of the lower end face of the fan blade is located at 1 / 2 of the frame step, ensuring that the axial impact force is evenly distributed and avoiding local stress concentration. The distances of the first and second gaps are both smaller than the spring pitch after compression, so that the spring always maintains a certain elastic space during compression, effectively buffering and absorbing vibration energy.

[0012] (2) The fan of this utility model can operate stably in complex vibration environments, which greatly extends its service life and improves its overall reliability. In addition, the fitting precision between the fan blade shaft and the ball bearing is effectively controlled to ensure the stability and concentricity of the fan blade assembly during rotation, further improving the fan's tolerance to high vibration environments. Attached Figure Description

[0013] Figure 1 This is a three-dimensional sectional view of the present invention; Figure 2 This is a parallel sectional view of the present invention; Figure 3 For the present utility model Figure 2 Enlarged view of point A; Figure 4 For the present utility model Figure 2 Enlarged view of point B; Figure 5For the present utility model Figure 1 Enlarged view of point C. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0015] like Figures 1 to 5 As shown, a vibration-resistant ball bearing fan structure includes a fan frame 1, a frame step 2, a power assembly 3, a central tube 4, a fan blade shaft 5, a fan blade assembly 6, a spring 7, an upper fan blade step 8, a lower fan blade step 9, a first gap 10, a second gap 11, a pitch 12, and a ball bearing 13.

[0016] In the description of this utility model, unless otherwise stated, "a plurality of" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," "front end," "rear end," "head," "tail," etc., indicate the orientation or positional relationship 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 do not 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. In addition, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0017] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0018] like Figures 1 to 5As shown, the fan frame 1 has an annular frame step 2 on its inner side. A power assembly 3 is mounted on the fan frame 1, and a central tube 4 is fitted inside the power assembly 3. The central tube 4 is rotatably connected to the fan blade shaft 5. The upper end of the fan blade shaft 5 is adapted to the fan blade assembly 6. A spring 7 is fitted on the fan blade shaft 5, and the upper end of the spring 7 abuts against the inner side of the fan blade assembly 6. The power assembly 3 is fixedly connected to the fan frame 1 through the central tube 4. The overall structure is compact and the force is evenly distributed. Specifically, the power assembly 3 described in this embodiment is a common motor. This utility model does not improve the structure of the motor; therefore, its specific working process is omitted in this embodiment. Existing motors can be driven by a precise electronic control system, which can adjust the speed according to actual needs to adapt to the heat dissipation or air circulation requirements under different vibration environments. Simultaneously, the connection between the motor and the central tube 4 uses high-strength, low-friction materials to reduce energy loss and improve transmission efficiency.

[0019] Two ball bearings 13 are spaced apart on the fan blade shaft 5, with the outer wall of the ball bearing 13 connected to the central tube 4. The upper end of the upper ball bearing 13 contacts the lower end of the spring 7, and the lower end of the lower ball bearing 13 contacts the fan frame 1. The spring 7 can apply a stable axial preload to the fan blade shaft 5. By accurately calculating the stiffness and precompression of the spring 7, it maintains appropriate elasticity under normal operating conditions, responds quickly to external vibration and impact, absorbs excess kinetic energy, and effectively avoids rigid collisions between structural components, improving the overall vibration resistance and operational stability of the fan. This structure, through the reasonable allocation of clearances and spring 7 parameters, allows the fan to buffer the impact force sequentially through the first clearance 10 and the second clearance 11 when subjected to axial vibration, and then the spring 7 further absorbs the residual vibration energy, preventing the ball bearings 13 from directly bearing excessive loads, thereby effectively improving the fan's adaptability and long-term operational stability in harsh vibration environments. In practical applications, this structural design not only effectively improves the fan's vibration resistance but also significantly reduces maintenance frequency and failure rate, improving the overall operating efficiency of the fan.

[0020] An annular upper step 8 is provided on the inner side of the fan blade assembly 6 around the fan blade axis 5. The upper step 8 does not contact the top of the central tube 4 and forms a first gap 10. An annular lower step 9 is provided on the lower inner side of the fan blade assembly 6. The lower step 9 does not contact the frame step 2 and forms a second gap 11.

[0021] The radial projection edge of the lower end face of the fan blade step 9 is at 1 / 2 of the frame step 2, ensuring uniform distribution of axial impact force and avoiding local stress concentration.

[0022] The distance between the first gap 10 and the second gap 11 is equal. The distance between the first gap 10 and the second gap 11 is smaller than the pitch 12 of the spring 7 after compression. This ensures that the spring 7 maintains a certain elastic space during compression, effectively buffering and absorbing vibration energy.

[0023] When the fan undergoes a relatively violent axial movement, the first points of contact between the fan blade assembly 6 and the fan frame 1 are the first gap 10 formed between the top of the central tube 4 and the upper step 8 of the fan blade, and the second gap 11 formed between the lower step 9 of the fan blade and the step 2 of the frame. These two points first absorb the impact force brought about by the violent axial movement of the fan. At this time, there is still space in the pitch 12 of the spring 7. This avoids the ball bearing 13 in the middle being impacted after the spring 7 is fully compressed. This protects the ball bearing 13 from damage and achieves a vibration resistance effect.

[0024] The fan of this invention can operate stably in complex vibration environments, greatly extending its service life and improving overall reliability. Furthermore, the precise control of the fit between the fan blade shaft 5 and the ball bearing 13 ensures the stability and concentricity of the fan blade assembly 6 during rotation, further enhancing the fan's tolerance to high vibration environments.

[0025] The vibration durability test and mechanical shock test data of this utility model are shown in Table 1 below. As can be seen from Table 1, the fan of this utility model shows a significantly smaller increase in noise after vibration testing at low speeds, and can still maintain stable airflow output without significant performance degradation under high-frequency vibration environments. At the same time, the structural design takes into account both assembly accuracy and manufacturing cost, and has good feasibility for mass production.

[0026]

[0027] Table 1 The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in this utility model, based on the technical solution and inventive concept of this utility model, should be included within the scope of protection of this utility model.

Claims

1. A vibration-resistant ball bearing fan structure, characterized in that: The fan frame (1), frame step (2), power assembly (3), central tube (4), fan blade shaft (5), fan blade assembly (6), and spring (7) are included. The fan frame (1) has an annular frame step (2) on its inner side. The fan frame (1) is equipped with a power assembly (3). The power assembly (3) is fitted with a central tube (4). The central tube (4) is rotatably connected to the fan blade shaft (5). The upper end of the fan blade shaft (5) is adapted to the fan blade assembly (6). The fan blade shaft (5) is fitted with a spring (7). The upper end of the spring (7) abuts against the inner side of the fan blade assembly (6).

2. The vibration-resistant ball bearing fan structure according to claim 1, characterized in that: Two ball bearings (13) are spaced apart on the fan blade shaft (5). The outer wall of the ball bearing (13) is connected to the middle tube (4). The upper end of the upper ball bearing (13) is in contact with the lower end of the spring (7), and the lower end of the lower ball bearing (13) is in contact with the fan frame (1).

3. The vibration-resistant ball bearing fan structure according to claim 2, characterized in that: The inner side of the fan blade assembly (6) is provided with an annular upper step (8) around the fan blade axis (5). The upper step (8) does not contact the top of the middle tube (4) and forms a first gap (10).

4. The vibration-resistant ball bearing fan structure according to claim 3, characterized in that: The fan blade assembly (6) has an annular fan blade lower step (9) at the lower inner side. The fan blade lower step (9) does not contact the frame step (2) and forms a second gap (11).

5. The vibration-resistant ball bearing fan structure according to claim 4, characterized in that: The radial projection edge of the lower end face of the fan blade step (9) is at 1 / 2 of the frame step (2).

6. The vibration-resistant ball bearing fan structure according to claim 5, characterized in that: The distance between the first gap (10) and the second gap (11) is equal, and the distance between the first gap (10) and the second gap (11) is less than the pitch (12) of the spring (7) after compression.

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