Air pump structure

Abstract

The utility model relates to the technical field of fluid conveying equipment, in particular to an air pump structure. The air pump structure comprises a pump body, a rotating shaft, a first bearing assembly, a second bearing assembly and an elastic gasket. The first bearing assembly comprises a first bearing and a first end cover. The second bearing assembly comprises a second bearing and a second end cover, in the axis direction of the pump body, the first end cover is arranged in the first bearing chamber in a covering mode and abuts against the first bearing for limiting, and an elastic gap is formed between the second bearing and the inner wall of the second bearing chamber. And the elastic gasket can be arranged in the elastic gap to abut against the inner walls of the second bearing and the second bearing chamber. According to the air pump structure, the machining tolerance and the assembly tolerance of the air pump structure in the axial direction are automatically compensated through elastic deformation of the elastic gasket, so that mechanical noise generated by poor matching of all parts is reduced, the service life of the air pump structure is prolonged, the second end cover and the second bearing are arranged at intervals in the axial direction, and the service life of the air pump structure is prolonged. And it can be guaranteed that the air pump structure can be adjusted to a good matching state.

Description

Technical Field

[0001] This application relates to the field of fluid transport equipment technology, and in particular to an air pump structure. Background Technology

[0002] Air pumps are primarily used for compressing or transporting gases. Existing air pump structures generally consist of a pump body, transmission components, and bearing assemblies that are tightly fitted together, operating through the mechanical cooperation between these components.

[0003] However, in actual production or assembly, due to limitations in the processing level and material properties of each component, there may be processing tolerances in dimensions such as diameter and length, as well as assembly tolerances such as assembly gaps and concentricity. This can lead to significant mechanical noise generated when the components are subjected to gas impact forces during operation due to poor fit, thus affecting the service life of the air pump. Utility Model Content

[0004] Therefore, it is necessary to provide an air pump structure that can reduce mechanical noise caused by poor fit of various components and extend their service life.

[0005] To solve the above-mentioned technical problems, this application provides the following technical solution:

[0006] An air pump structure, the air pump structure comprising:

[0007] The pump body has a shaft hole, a first bearing chamber and a second bearing chamber. Along the axial direction of the shaft hole, the first bearing chamber is located at one end of the shaft hole and the second bearing chamber is located at the other end of the shaft hole.

[0008] A rotating shaft is rotatably mounted in the shaft hole and has a first end and a second end, the first end being located in the first bearing chamber and the second end being located in the second bearing chamber;

[0009] A first bearing assembly includes a first bearing and a first end cap. The first bearing is housed in a first bearing chamber and sleeved on the first end cap. The first end cap covers the first bearing chamber and is connected to the bearing housing.

[0010] The first bearing abuts against the limiting position in the axial direction;

[0011] The second bearing assembly includes a second bearing and a second end cap. The second bearing is housed in the second bearing chamber and sleeved on the second end. In the axial direction, an elastic gap is formed between the side of the second bearing facing the first bearing and the inner wall of the second bearing chamber. The second end cap covers the second bearing chamber and is spaced apart from the second bearing in the axial direction.

[0012] An elastic gasket is fitted onto the second end and located within the elastic gap, and in the axial direction, the elastic gasket abuts against the inner wall of the second bearing and the second bearing chamber, respectively.

[0013] Understandably, this application, by setting up a first bearing assembly, a second bearing assembly, and an elastic gasket, and by placing a first end cover on the first bearing chamber and abutting against and limiting the first bearing in the axial direction, forms an elastic gap between the second bearing and the inner wall of the second bearing chamber, and allows the elastic gasket to be placed within the elastic gap and abut against the inner walls of the second bearing and the second bearing chamber. Thus, during operation, the second bearing can move axially away from the first bearing assembly under the action of the elastic gasket, adjusting the axial fit between the rotating shaft, the first bearing assembly, and the second bearing assembly. This utilizes the elastic deformation of the elastic gasket to automatically compensate for machining and assembly tolerances in the axial direction of the air pump structure, thereby reducing mechanical noise caused by poor fit of components and extending the service life of the air pump structure. Furthermore, the second end cover and the second bearing are spaced apart in the axial direction, ensuring sufficient clearance for the second bearing to allow the air pump structure to adjust to an optimal fit, further reducing mechanical noise.

[0014] In one embodiment, the first bearing chamber includes a first limiting wall and a second limiting wall, the first limiting wall and the second limiting wall respectively abutting against the first bearing in the axial direction and the circumferential direction of the shaft hole.

[0015] Understandably, the first bearing is positioned against the first limiting wall and the second limiting wall. This position and fixes the first bearing within the first bearing chamber, preventing the first bearing from colliding with the first bearing chamber during operation of the air pump structure and generating collision noise. It also reduces the possibility of damage to the first bearing due to collision.

[0016] In one embodiment, the second bearing chamber has a third limiting wall, and the elastic gasket abuts against the third limiting wall on the side of the first bearing chamber in the axial direction.

[0017] In one embodiment, the elastic pad is configured as a wave-shaped pad.

[0018] Understandably, corrugated gaskets have the characteristics of fatigue resistance and controllable elasticity. By setting the elastic gasket as a corrugated gasket, the air pump structure can be adjusted in the axial direction through the controllable elasticity of the corrugated gasket, thereby reducing mechanical noise caused by poor fit of various components. Moreover, its fatigue resistance extends the service life of the elastic gasket.

[0019] In one embodiment, the rotating shaft is provided with a first limiting step near the first end in the axial direction, and the side of the first bearing facing the second end is limited and abuts against the first limiting step.

[0020] It is understandable that the limiting step of the first limiting step can limit and fix the first bearing on the rotating shaft, so as to prevent the first bearing from being displaced relative to the rotating shaft in the axial direction during the operation of the air pump structure, or from rubbing or colliding with the rotating shaft and generating noise.

[0021] In one embodiment, the rotating shaft is provided with a second limiting step near the second end in the axial direction, and one side of the second bearing facing the first end can be limited and abutted against the second limiting step.

[0022] Understandably, the limiting step of the second limiting step can limit and fix the second bearing on the rotating shaft, thereby reducing the possibility of the second bearing being displaced relative to the rotating shaft in the axial direction during the operation of the air pump structure, or generating collision noise.

[0023] In one embodiment, the second bearing is further provided with a fastener, and the rotating shaft is provided with a fixing hole at one end near the second bearing along the axial direction;

[0024] The fastener can be inserted into the fixing hole and abut against and limit the second bearing in the axial direction.

[0025] Understandably, the fasteners are designed to secure the second bearing to the rotating shaft, preventing it from detaching from the shaft along the axial direction and improving the stability of the assembly between the second bearing and the rotating shaft.

[0026] In one embodiment, the second end cap is provided with a clearance groove on the side facing the second bearing, the clearance groove being used to avoid the fastener.

[0027] Understandably, the clearance groove is designed to avoid fasteners, allowing the second bearing to have movable space in the axial direction. This prevents the second bearing from colliding with the second end cover and generating mechanical noise when it moves toward the second end cover under the action of the elastic pad.

[0028] In one embodiment, the second bearing chamber further has a fourth limiting wall, and the second bearing has a fluctuating gap with the fourth limiting wall in the circumferential direction.

[0029] Understandably, the set fluctuation gap can reduce the friction between the second bearing and the fourth limiting wall, so that the second bearing can move in the axial direction towards the second end cover after being subjected to the elastic force of the elastic pad, so as to ensure that the components in the air pump structure can be adjusted to a better fit in the axial direction and reduce the generation of mechanical noise.

[0030] In one embodiment, the end of the first end cap near the first bearing extends into the first bearing chamber and is tightly fitted with the second limiting wall;

[0031] And / or, the end of the second end cap near the second bearing extends into the second bearing chamber and is tightly fitted with the fourth limiting wall.

[0032] Understandably, this ensures the stability of the installation of the first and second end caps, enabling them to stably shield the first and second bearing chambers, thereby preventing mechanical noise from the internal parts of the air pump structure from being transmitted to the external environment.

[0033] Compared with existing technologies, this application, by setting up a first bearing assembly, a second bearing assembly, and an elastic gasket, and by placing a first end cover on the first bearing chamber and abutting and limiting it in the axial direction, forms an elastic gap between the second bearing and the inner wall of the second bearing chamber, and allows the elastic gasket to be placed within the elastic gap and abutting against the inner walls of the second bearing and the second bearing chamber. In this way, during operation, the second bearing can move axially away from the first bearing assembly under the action of the elastic gasket, adjusting the axial fit between the rotating shaft, the first bearing assembly, and the second bearing assembly. That is, the elastic deformation of the elastic gasket automatically compensates for machining and assembly tolerances in the axial direction of the air pump structure, thereby reducing mechanical noise caused by poor fit of components and extending the service life of the air pump structure. Furthermore, the second end cover and the second bearing are spaced apart in the axial direction, ensuring sufficient movement clearance for the second bearing, allowing the air pump structure to be adjusted to an optimal fit, further reducing the generation of abnormal mechanical noise. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the overall structure of the air pump provided in this application.

[0036] Figure 2 This is an exploded structural diagram of the air pump structure provided in this application.

[0037] Figure 3 This is a schematic diagram of the pump body near the first bearing chamber provided in this application.

[0038] Figure 4 This is a schematic diagram of the pump body near the second bearing chamber provided in this application.

[0039] Figure 5 This is a structural schematic diagram of the air pump structure provided in this application from another perspective.

[0040] Figure 6 Provided for this application Figure 5 A schematic diagram of the cross-sectional structure at point AA.

[0041] Figure 7 Provided for this application Figure 6 A schematic diagram of the structure at point B.

[0042] Figure 8 Provided for this application Figure 6 A schematic diagram of the structure at point C.

[0043] The component labels are as follows:

[0044] 100. Air pump structure; 10. Pump body; 11. Shaft hole; 12. First bearing chamber; 121. First limiting wall; 122. Second limiting wall; 13. Second bearing chamber; 131. Third limiting wall; 132. Fourth limiting wall; 133. Fluctuating clearance; 20. Rotating shaft; 21. First end; 22. Second end; 23. First limiting step; 24. Fixing hole; 25. Second limiting step; 26. Fastener; 261. Gasket; 30. First bearing assembly; 31. First bearing; 32. First end cover; 40. Second bearing assembly; 41. Second bearing; 42. Second end cover; 421. Circumvention groove; 43. Elastic clearance; 50. Elastic gasket; 60. Valve plate. Detailed Implementation

[0045] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0046] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0047] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0048] In this application, unless otherwise expressly 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 and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates 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 indicates that the first feature is at a lower horizontal level than the second feature.

[0049] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0050] Please see Figures 1 to 8This application provides an air pump structure 100, which includes a pump body 10, a rotating shaft 20, a first bearing assembly 30, a second bearing assembly 40, and an elastic gasket 50. The pump body 10 has a shaft hole 11, a first bearing chamber 12, and a second bearing chamber 13. Along the axial direction x of the shaft hole 11, the first bearing chamber 12 is located at one end of the shaft hole 11, and the second bearing chamber 13 is located at the other end of the shaft hole 11. The rotating shaft 20 is rotatably mounted in the shaft hole 11 and has a first end 21 and a second end 22. The first end 21 is located in the first bearing chamber 12, and the second end 22 is located in the second bearing chamber 13. The first bearing assembly 30 includes a first bearing 31 and a first end cap 32. The first bearing 31 is housed in the first bearing chamber 12 and... A first end cap 32 is fitted onto the first bearing chamber 12 and abuts against and limits the first bearing 31 in the axial direction x. The second bearing assembly 40 includes a second bearing 41 and a second end cap 42. The second bearing 41 is housed in the second bearing chamber 13 and fitted onto the second end 22. In the axial direction x, an elastic gap 43 is formed between the side of the second bearing 41 facing the first bearing 31 and the inner wall of the second bearing chamber 13. The second end cap 42 is fitted onto the second bearing chamber 13 and is spaced apart from the second bearing 41 in the axial direction x. An elastic gasket 50 is fitted onto the second end 22 and located within the elastic gap 43. In the axial direction x, the elastic gasket 50 abuts against the inner walls of the second bearing 41 and the second bearing chamber 13, respectively.

[0051] It is understandable that during the production process, the air pump structure 100 will typically have machining tolerances and assembly tolerances for its parts. In addition, the pump body 10 is equipped with components such as ball bearings. These components cause clearances between the various parts of the air pump structure 100. Furthermore, when compressing or transporting gas, i.e. during the operation of the air pump structure 100, the rotating shaft 20 and bearings and other components inside the pump body 10 will inevitably be impacted by the reaction force of the gas. Especially during the gas transport process, the pressure of the gas reaction force on the components inside the air pump structure 100 can reach five to six times the atmospheric pressure. At this time, due to the existence of tolerances and clearances, the above-mentioned components may not fit well and cannot be stabilized in the optimal operating state, thereby generating strong mechanical noise. At the same time, it will also cause abnormal friction and collision between components, leading to an increase in temperature inside the pump body 10, abnormal operation, or a reduction in the overall lifespan of the air pump structure 100. Therefore, this application provides a first bearing assembly 30, a second bearing assembly 40, and an elastic gasket 50. In the axial direction x, the first end cap 32 is placed on the first bearing chamber 12 and abuts against and limits the first bearing 31. An elastic gap 43 is formed between the second bearing 41 and the inner wall of the second bearing chamber 13. The elastic gasket 50 can be placed in the elastic gap 43 and abut against the inner wall of the second bearing 41 and the second bearing chamber 13. In this way, when the air pump structure 100 is running, the second bearing 41 can move away from the first bearing assembly 30 in the axial direction x under the action of the elastic shim 50, thereby adjusting the fit between the rotating shaft 20, the first bearing assembly 30 and the second bearing assembly 40 in the axial direction x. That is, the elastic deformation of the elastic shim 50 is used to automatically compensate for the machining tolerance and assembly tolerance of the air pump structure 100 in the axial direction x, thereby reducing the mechanical noise caused by poor fit of the components and extending the service life of the air pump structure 100. In addition, the second end cover 42 and the second bearing 41 are spaced apart in the axial direction x, which can ensure that the second bearing 41 has sufficient movement clearance, so that the air pump structure 100 can be adjusted to a better fit, thereby further reducing the generation of mechanical noise. At the same time, the first end cover 32 and the second end cover 42 can form a closed space inside the pump body 10, thereby shielding the noise generated by the components inside the pump body 10 during operation, so as to reduce the noise perceived by the outside of the pump body 10.

[0052] like Figures 2 to 8 As shown, the first bearing chamber 12 includes a first limiting wall 121 and a second limiting wall 122. The first limiting wall 121 and the second limiting wall 122 respectively limit and abut against the first bearing 31 in the axial direction x and the circumferential direction y of the shaft hole 11. In this way, the first bearing 31 can be limited and fixed in the first bearing chamber 12, so that it will not collide with the first bearing chamber 12 and generate collision noise when the air pump structure 100 is running, and it can also prevent the first bearing 31 from being damaged by collision.

[0053] Furthermore, the second bearing chamber 13 has a third limiting wall 131, and the elastic gasket 50 abuts against the third limiting wall 131 on the side of the first bearing chamber 12 in the axial direction x. It is understood that the elastic gasket 50 abuts against the third limiting wall 131 so that when the second bearing 41 moves towards the third limiting wall 131 in the axial direction x after being impacted by gas during the operation of the air pump structure, the elastic gasket 50 can buffer the movement, preventing it from directly colliding with the third limiting wall 131 and generating excessive noise. Moreover, after being compressed and deformed by the second bearing 41, the elastic gasket 50 will have a rebound tendency and return to its original position, thereby driving the second bearing 41 back to its normal mating position. This ensures better fit between the components of the air pump structure 100, reducing mechanical noise and structural damage caused by friction and collision between components.

[0054] In one embodiment, the second bearing chamber 13 further includes a fourth limiting wall 132, and the second bearing 41 has a fluctuating gap 133 between itself and the fourth limiting wall 132 in the circumferential direction y. It is understood that the fluctuating gap 133 reduces the friction between the second bearing 41 and the fourth limiting wall 132, thereby allowing the second bearing 41 to move in the axial direction x towards the second end cover 42 after being subjected to the elastic force of the elastic pad 50. This further ensures that the components in the air pump structure 100 can be adjusted to a better fit in the axial direction x, reducing mechanical noise.

[0055] Here, the size of the fluctuation gap 133 is L, where 5μm≤L≤10μm. Here, the value of L can be 5μm, 6μm, 7μm, 8μm, 9μm, and 10μm, etc.

[0056] Please refer to Figures 2 to 7 The rotating shaft 20 has a first limiting step 23 near the first end 21 in the axial direction x. The side of the first bearing 31 facing the second end 22 is limited and abuts against the first limiting step 23. In this way, the first bearing 31 can be limited and fixed on the rotating shaft 20 to avoid displacement of the first bearing 31 relative to the rotating shaft 20 in the axial direction x during the operation of the air pump structure 100, or friction and collision with the rotating shaft 20 that would generate noise.

[0057] Here, a fixing adhesive can be provided on the inner wall of the first bearing 31 facing the rotating shaft 20 in the circumferential direction y and on the outer side of the rotating shaft 20 opposite to it, so as to further ensure a stable connection between the first bearing 31 and the rotating shaft 20.

[0058] Furthermore, the rotating shaft 20 is provided with a second limiting step 25 near the second end 22 in the axial direction x, and the side of the second bearing 41 facing the first end 21 can be limited and abutted against the second limiting step 25. In this way, the second bearing 41 can be limited and fixed on the rotating shaft 20, so as to avoid the second bearing 41 from being displaced relative to the rotating shaft 20 in the axial direction x during the operation of the air pump structure 100, or from rubbing or colliding with the rotating shaft 20 and generating noise.

[0059] Here, a fixing adhesive can be provided on the inner wall of the rotating shaft 20 and the outer side of the rotating shaft 20 in the circumferential direction y to further ensure a stable connection between the second bearing 41 and the rotating shaft 20.

[0060] In one embodiment, a fixing hole 24 is provided at one end of the rotating shaft 20 near the second bearing 41 along the axial direction x, and a fastener 26 is also provided on the second bearing 41; wherein, the fastener 26 can pass through the fixing hole 24 and abut against and limit the second bearing 41 in the axial direction x. In this way, the second bearing 41 can be stably fixed on the rotating shaft 20, improving the stability of the assembly between the second bearing 41 and the rotating shaft 20.

[0061] Here, the fastener 26 can be one of the following components: screw, bolt, rivet, etc., and there is no limitation. In this embodiment, the fastener 26 is configured as a screw.

[0062] Preferably, a gasket 261 is provided between the fastener 26 and the second bearing 41 to make the fastener 26 and the second bearing 41 more firmly abut against each other, thereby increasing the degree of locking between the second bearing 41 and the rotating shaft 20.

[0063] Please continue to refer to this. Figures 3 to 8 The first end cap 32 extends into the first bearing chamber 12 near the first bearing 31 and is tightly fitted with the second limiting wall 122; and / or, the second end cap 42 extends into the second bearing chamber 13 near the second bearing 41 and is tightly fitted with the fourth limiting wall 132. This ensures the installation stability of the first end cap 32 and the second end cap 42, allowing them to stably shield the first bearing chamber 12 and the second bearing chamber 13, thereby preventing mechanical noise from the internal parts of the air pump structure 100 from being transmitted to the external environment.

[0064] Here, fixing adhesive can be provided at the parts where the first end cover 32 and the second end cover 42 are tightly fitted with the first bearing chamber 12 and the second bearing chamber 13, respectively, to further increase the tight fit between the first end cover 32 and the second end cover 42 and the first bearing chamber 12 and the second bearing chamber 13, respectively, and ensure the reliability of the installation of the first end cover 32 and the second end cover 42.

[0065] For example, the second end cap 42 is provided with a relief groove 421 on the side facing the second bearing 41, and the relief groove 421 is used to avoid the fastener 26. In this way, it can be ensured that the second bearing 41 has movable space in the axial direction x, and the second bearing 41 will not generate mechanical noise due to collision with the second end cap 42 when it moves towards the second end cap 22 under the action of the elastic washer 50.

[0066] In one embodiment, the elastic gasket 50 is configured as a corrugated gasket. It is understood that corrugated gaskets have the characteristics of fatigue resistance and controllable elasticity. By configuring the elastic gasket 50 as a corrugated gasket, the air pump structure can be adjusted in the axial direction through the controllable elasticity of the corrugated gasket, thereby reducing mechanical noise caused by poor fit of various components, and its fatigue resistance extends the service life of the elastic gasket 50.

[0067] Please continue to refer to this. Figure 2 The air pump structure 100 also includes a valve plate 60, which is existing technology and will not be described in detail here.

[0068] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. An air pump structure, characterized in that, The air pump structure includes: The pump body (10) has a shaft hole (11), a first bearing chamber (12) and a second bearing chamber (13). Along the axial direction of the shaft hole (11), the first bearing chamber (12) is located at one end of the shaft hole (11) and the second bearing chamber (13) is located at the other end of the shaft hole (11). A rotating shaft (20) is rotatably mounted in the shaft hole (11) and has a first end (21) and a second end (22), the first end (21) being located in the first bearing chamber (12) and the second end (22) being located in the second bearing chamber (13); The first bearing assembly (30) includes a first bearing (31) and a first end cap (32). The first bearing (31) is housed in the first bearing chamber (12) and sleeved on the first end (21). The first end cap (32) covers the first bearing chamber (12) and abuts against and limits the first bearing (31) in the axial direction. The second bearing assembly (40) includes a second bearing (41) and a second end cap (42). The second bearing (41) is housed in the second bearing chamber (13) and sleeved on the second end (22). In the axial direction, an elastic gap (43) is formed between the side of the second bearing (41) facing the first bearing (31) and the inner wall of the second bearing chamber (13). The second end cap (42) covers the second bearing chamber (13) and is spaced apart from the second bearing (41) in the axial direction. An elastic gasket (50) is fitted onto the second end (22) and located within the elastic gap (43), and in the axial direction, the elastic gasket (50) abuts against the inner walls of the second bearing (41) and the second bearing chamber (13), respectively.

2. The air pump structure according to claim 1, characterized in that, The first bearing chamber (12) includes a first limiting wall (121) and a second limiting wall (122), and the first limiting wall (121) and the second limiting wall (122) respectively limit and abut against the first bearing (31) in the axial direction and the circumferential direction of the shaft hole (11).

3. The air pump structure according to claim 1, characterized in that, The second bearing chamber (13) has a third limiting wall (131), and the elastic pad (50) abuts against the third limiting wall (131) on the side of the first bearing chamber (12) in the axial direction.

4. The air pump structure according to claim 1, characterized in that, The elastic pad (50) is configured as a wave-shaped pad.

5. The air pump structure according to claim 1, characterized in that, The rotating shaft (20) has a first limiting step (23) located near the first end (21) in the axial direction, and the side of the first bearing (31) facing the second end (22) is limited and abuts against the first limiting step (23).

6. The air pump structure according to claim 1, characterized in that, The rotating shaft (20) is provided with a second limiting step (25) near the second end (22) in the axial direction, and the side of the second bearing (41) facing the first end (21) can be limited and abutted against the second limiting step (25).

7. The air pump structure according to claim 1, characterized in that, The second bearing (41) is also provided with a fastener (26), and the rotating shaft (20) is provided with a fixing hole (24) at one end near the second bearing (41) along the axial direction; The fastener (26) can be inserted into the fixing hole (24) and abut against and limit the second bearing (41) in the axial direction.

8. The air pump structure according to claim 7, characterized in that, The second end cap (42) is provided with a relief groove (421) on the side facing the second bearing (41), and the relief groove (421) is used to avoid the fastener (26).

9. The air pump structure according to claim 2, characterized in that, The second bearing chamber (13) also has a fourth limiting wall (132), and the second bearing (41) has a fluctuating gap (133) between itself and the fourth limiting wall (132) in the circumferential direction.

10. The air pump structure according to claim 9, characterized in that, The end of the first end cap (32) near the first bearing (31) extends into the first bearing chamber (12) and is tightly fitted with the second limiting wall (122); And / or, the end of the second end cap (42) near the second bearing (41) extends into the second bearing chamber (13) and is fitted tightly with the fourth limiting wall (132).

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