Pre-tightening fixing structure of fan bearing system

Abstract

The fan bearing system pre-tightening fixing structure comprises a rotating shaft and a shaft sleeve arranged on the rotating shaft in a sleeving mode, a large limiting bearing and a small limiting bearing which are used for supporting the rotating shaft are arranged on the two sides of the lower portion of the rotating shaft respectively, and the large limiting bearing and the small limiting bearing are both located in the shaft sleeve. A pre-tightening sleeve and a fixing sleeve which are arranged on the rotating shaft in a sleeving mode are arranged between the large limiting bearing and the small limiting bearings, the two ends of the fixing sleeve are in partial contact with the inner side end faces of the large limiting bearing and the small limiting bearings correspondingly, and a pre-tightening nut and an adjusting gasket are arranged on the side, away from the fixing sleeve, between the small limiting bearings. Through lateral pressure of the pre-tightening nut and the adjusting gasket on the small limiting bearing, the small limiting bearing extrudes the fixing sleeve from the lateral direction, and in a word, the fan has the advantages of being high in environmental adaptability, high in operation reliability, long in service life and capable of reducing natural vibration and mechanical noise of the fan and improving the overall quality of the fan.

Description

Technical Field

[0001] The invention relates to the technical field of small axial flow fans, and in particular to a fan bearing system pre-tightening and fixing structure. Background Art

[0002] Air cooling is a cooling method that uses air as a medium to cool the object to be cooled. The basic principle is to increase the surface area of ​​the object to be cooled or to speed up the rate at which air flows through the object per unit time. Usually, air cooling can be achieved by adding heat sinks to the surface of the object or using fans to enhance ventilation, thereby improving the cooling effect. It is widely used in motor vehicles, electronic components, industry and other fields. In addition, air cooling has a relatively simple structure, small size, light weight, and is easy to install and use. It has been widely used in electronic equipment and is the main heat dissipation method currently used. As the core component of air cooling, the small axial flow fan has stable operation, long life and low vibration, which are the key to affecting the operation quality of the cooling system. The preload and fixation method of the bearing system of the small axial flow fan determines whether the fan itself can operate stably for a long time, withstand a wide temperature range and work with low vibration.

[0003] At present, small military axial flow fans need to be used under complex and harsh climatic conditions, which have higher requirements for fan reliability. However, existing small axial flow fans have problems such as easy sliding of shafts, bearings and sleeves, poor adaptability and short service life. Therefore, a fan bearing system pre-tightening and fixing structure is urgently needed to solve the above problems. Summary of the invention

[0004] In view of this, the present invention proposes a fan bearing pre-tightening and fixing structure, which is applied to the technical field of small axial flow fans to solve the technical problems of existing small axial flow fans such as easy sliding of internal fittings, poor environmental adaptability, low operating reliability and short service life.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A pre-tightening and fixing structure of a fan bearing system comprises a rotating shaft and a sleeve sleeved on the rotating shaft, a large limit bearing and a small limit bearing supporting the rotating shaft are respectively arranged on both sides below the rotating shaft, the large limit bearing and the small limit bearing are both located inside the sleeve, a pre-tightening sleeve and a fixing sleeve sleeved on the rotating shaft are arranged between the large limit bearing and the small limit bearing, the fixing sleeve is arranged close to the rotating shaft, the pre-tightening sleeve is located between the sleeve and the fixing sleeve in the diameter direction of the rotating shaft, the pre-tightening sleeve forms a lateral extrusion force on the inner end faces of the large limit bearing and the small limit bearing through the elasticity of its own material and structure, the two ends of the fixing sleeve are also in contact with the inner end faces of the large limit bearing and the small limit bearing respectively, a pre-tightening nut and an adjusting gasket are arranged on the side of the small limit bearing away from the fixing sleeve, the lateral pressure of the pre-tightening nut and the adjusting gasket on the small limit bearing is applied, so that the small limit bearing is pressed against the fixing sleeve from the side, and the fixing sleeve is pressed and fixed to the inner part of the large limit bearing and the small limit bearing by the fixing sleeve.

[0007] Furthermore, both ends of the preload sleeve are provided with a slotted flange end and a plane end, the large limiting bearing and the slotted flange end are both arranged close to the preload sleeve, the end face of the large limiting bearing close to the preload sleeve is in contact with the corresponding slotted flange end, and the end face of the small limiting bearing close to the preload sleeve is in contact with the corresponding plane end.

[0008] Furthermore, the outer ring portion of the large limit bearing close to the sleeve position is arranged between the corner position of the sleeve and the elastic retaining ring for the hole, and the large limit bearing is fixed by the sleeve and the elastic retaining ring for the hole. The small limit bearing is located between the sleeve and the rotating shaft in the diameter direction of the rotating shaft, and the small limit bearing is fixed by the sleeve and the rotating shaft.

[0009] Furthermore, a fastening nut is provided on the outer side of the pre-tightening nut, and the fastening nut is located on the side of the pre-tightening nut away from the limiting small bearing. The adjusting gasket is arranged between the fastening nut and the limiting small bearing. By fastening the fastening nut to the left end face of the pre-tightening nut, a double axial fixation is formed to avoid the disappearance of the bearing pre-tightening force in a vibration environment.

[0010] The present invention has the following beneficial effects:

[0011] The present invention mentions a pre-tightening and fixing structure of a fan bearing system. Through the provision of a pre-tightening sleeve and a fixing sleeve, the inner ring and outer ring of the limit large bearing and the limit small bearing, as well as the rotating shaft and the sleeve will not slide relative to each other even if there is a small clearance between them. This improves the environmental adaptability, operation reliability and service life of the fan, while reducing the self-vibration and mechanical noise of the fan, thereby improving the quality of the fan as a whole. Through the pre-tightening sleeve, the fixing sleeve, the adjusting gasket, the pre-tightening nut and the fixing nut, the limit large bearing and the limit small bearing are pre-tightened and fixed between the rotating shaft and the sleeve. The pre-tightening force can be flexibly adjusted, thereby achieving the purpose of stable, long-term and reliable operation of the fan rotor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 A structural schematic diagram of a fan bearing system pre-tightening and fixing structure provided by the present invention;

[0014] Figure 2 It is a schematic diagram of the structure of the shaft sleeve in a specific embodiment of the present invention;

[0015] Figure 3 It is a structural schematic diagram of a pre-tightening sleeve in a specific embodiment of the present invention;

[0016] Figure 4 It is a structural schematic diagram of a fixing sleeve in a specific embodiment of the present invention;

[0017] Among them: 1. rotating shaft; 2. shaft sleeve; 3. large limit bearing; 4. small limit bearing; 5. preload sleeve; 6. fixing sleeve; 7. preload nut; 9. adjusting gasket; 10. fastening nut; 11. elastic retaining ring for hole. DETAILED DESCRIPTION

[0018] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0020] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present invention, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0021] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention. The drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0022] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0023] Example 1

[0024] like Figures 1 to 4As shown, a pre-tightening and fixing structure of a fan bearing system comprises a rotating shaft 1 and a sleeve 2 sleeved on the rotating shaft 1, a large limit bearing 3 and a small limit bearing 4 supporting the rotating shaft 1 are respectively arranged on both sides below the rotating shaft 1, the large limit bearing 3 and the small limit bearing 4 are both located inside the sleeve 2, a pre-tightening sleeve 5 and a fixing sleeve 6 sleeved on the rotating shaft 1 are arranged between the large limit bearing 3 and the small limit bearing 4, the fixing sleeve 6 is arranged closely against the rotating shaft 1, the pre-tightening sleeve 5 is located between the sleeve 2 and the fixing sleeve 6 in the diameter direction of the rotating shaft 1, and the pre-tightening sleeve 5 Through the elasticity of its own material and structure, a lateral extrusion force is formed on the inner end faces of the large limiting bearing 3 and the small limiting bearing 4. The two ends of the fixed sleeve 6 are also in contact with the inner end faces of the large limiting bearing 3 and the small limiting bearing 4 respectively. The side of the small limiting bearing 4 away from the fixed sleeve 6 is provided with a pre-tightening nut 7 and an adjusting gasket 9. Through the lateral pressure of the pre-tightening nut 7 and the adjusting gasket 9 on the small limiting bearing 4, the small limiting bearing 4 is squeezed from the side of the fixed sleeve 6, thereby completing the extrusion and fixation of the fixed sleeve 6 on the inner parts of the large limiting bearing 3 and the small limiting bearing 4.

[0025] Both ends of the preload sleeve 5 are provided with a slotted flange end and a plane end. The large limit bearing 3 and the slotted flange end are both arranged close to the preload sleeve 5. The end face of the large limit bearing 3 close to the preload sleeve 5 contacts the corresponding slotted flange end, and the end face of the small limit bearing 4 close to the preload sleeve 5 contacts the corresponding plane end. The outer ring portion of the large limit bearing 3 close to the position of the sleeve 2 is arranged between the corner position of the sleeve 2 and the hole elastic retaining ring 11, and the large limit bearing 3 is fixed by the sleeve 2 and the hole elastic retaining ring 11. The small limit bearing 4 is located between the sleeve 2 and the rotating shaft 1 in the diameter direction of the rotating shaft 1, and the small limit bearing 4 is fixed by the sleeve 2 and the rotating shaft 1. A fastening nut 10 is provided on the outer side of the pre-tightening nut 7. The fastening nut 10 is located on the side of the pre-tightening nut 7 away from the limiting small bearing 4. The adjusting gasket 9 is arranged between the fastening nut 10 and the limiting small bearing 4. By fastening the fastening nut to the left end face of the pre-tightening nut 7, axial double fixation is formed to avoid the disappearance of the bearing pre-tightening force in a vibration environment.

[0026] In short, the present invention has the advantages of strong environmental adaptability, high operational reliability, long service life, reduced self-vibration and mechanical noise of the fan, and improved overall quality of the fan.

[0027] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A fan bearing preload fixing structure, characterized in that: The invention comprises a rotating shaft (1) and a sleeve (2) sleeved on the rotating shaft (1); a large limit bearing (3) and a small limit bearing (4) for supporting the rotating shaft (1) are respectively arranged on both sides below the rotating shaft (1); the large limit bearing (3) and the small limit bearing (4) are both located inside the sleeve (2); a pre-tightening sleeve (5) and a fixing sleeve (6) sleeved on the rotating shaft (1) are arranged between the large limit bearing (3) and the small limit bearing (4); the fixing sleeve (6) is arranged in close contact with the rotating shaft (1); the pre-tightening sleeve (5) is located between the sleeve (2) and the fixing sleeve (6) in the diameter direction of the rotating shaft (1); the pre-tightening sleeve (5) is automatically The elasticity of the material and structure of the body forms a lateral extrusion force on the inner end faces of the large limit bearing (3) and the small limit bearing (4); the two ends of the fixing sleeve (6) are also in contact with the inner end faces of the large limit bearing (3) and the small limit bearing (4) respectively; a pre-tightening nut (7) and an adjusting gasket (9) are provided on the side of the small limit bearing (4) away from the fixing sleeve (6); the lateral pressure of the pre-tightening nut (7) and the adjusting gasket (9) on the small limit bearing (4) causes the small limit bearing (4) to squeeze the fixing sleeve (6) from the side, thereby completing the squeezing and fixing of the inner parts of the large limit bearing (3) and the small limit bearing (4) by the fixing sleeve (6).

2. A fan bearing pre-tightening and fixing structure according to claim 1, characterized in that: Both ends of the preload sleeve (5) are provided with a slotted flange end and a plane end. The large limit bearing (3) and the slotted flange end are both arranged close to the preload sleeve (5). The end face of the large limit bearing (3) close to the preload sleeve (5) contacts the corresponding slotted flange end, and the end face of the small limit bearing (4) close to the preload sleeve (5) contacts the corresponding plane end.

3. A fan bearing pre-tightening and fixing structure according to claim 2, characterized in that: The outer ring portion of the large position-limiting bearing (3) close to the shaft sleeve (2) is arranged between the corner position of the shaft sleeve (2) and the hole elastic retaining ring (11), and the large position-limiting bearing (3) is fixed by the shaft sleeve (2) and the hole elastic retaining ring (11); the small position-limiting bearing (4) is located between the shaft sleeve (2) and the rotating shaft (1) in the diameter direction of the rotating shaft (1), and the small position-limiting bearing (4) is fixed by the shaft sleeve (2) and the rotating shaft (1).

4. A fan bearing pre-tightening and fixing structure according to claim 3, characterized in that: A fastening nut (10) is arranged on the outer side of the pre-tightening nut (7), and the fastening nut (10) is located on the side of the pre-tightening nut (7) away from the limiting small bearing (4). The adjusting gasket (9) is arranged between the fastening nut (10) and the limiting small bearing (4). By fastening the fastening nut to the left end face of the pre-tightening nut (7), axial double fixation is formed to prevent the bearing pre-tightening force from disappearing in a vibration environment.

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