A bearing mounting structure

Abstract

This utility model provides a bearing mounting structure, including a rotating shaft, on which a first bearing and a second bearing are sleeved. The rotating shaft has two limiting structures, with the first bearing and the second bearing located between the two limiting structures and a gap between the first bearing, the second bearing and the limiting structures. The first bearing is sleeved on a second mounting base, and the second bearing is sleeved on a first mounting base. A second washer is provided between the first bearing and the second bearing. The first mounting base is sleeved on a base, and along the axial direction of the rotating shaft, a first washer is provided at the end of the base. According to this utility model, the technical problem of the inability to adjust the air gap on both sides of the bearing in the prior art can be solved.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic levitation motor technology, specifically relating to a bearing mounting structure. Background Technology

[0002] Magnetic levitation bearings levitate the shaft in mid-air using electromagnetic force during operation, enabling non-contact rotation between the shaft and the magnetic bearing stator. Compared to traditional mechanical bearings, magnetic levitation bearings offer significant advantages: no mechanical wear, no lubrication required, long lifespan, high speed, and high reliability. These characteristics make them widely used in high-speed rotating equipment such as flywheel energy storage, molecular pumps, compressors, and aerospace applications. However, magnetic levitation bearings can be damaged by impacts upon failure, therefore, protective bearings are typically included as an emergency measure. These protective bearings bear the impact load in the event of failure, and their design requirements include: radial and axial clearances smaller than those of the magnetic bearing, and consistent clearances on both sides. However, in practical applications, due to factors such as manufacturing precision and installation errors, the clearance value of the protective bearing needs to be adjusted according to specific circumstances.

[0003] Related technologies disclose a magnetic levitation bearing device, a compressor, and a method for adjusting the clearance of a protective bearing. The protective bearing is installed radially inside a protective bearing bracket, and washers of different sizes are installed between the protective bearing bracket and the housing. By adjusting the size of the washers, the protective bearing can be moved axially, thereby adjusting the air gap distribution on both sides of the protective bearing. However, this structure cannot adjust the air gap on both sides of the protective bearing. If both air gaps are larger or smaller than the design range, this structure is difficult to adjust, requiring dimensional adjustments to components such as the rotor sleeve and retaining ring. Rotor components generally use interference fits, making disassembly and assembly complex. Furthermore, changes in rotor component dimensions require grinding, and adjustments will affect rotor dynamic balance, modal characteristics, and control accuracy.

[0004] Due to technical problems such as the inability of existing protective bearings to adjust the air gap on both sides of the bearing, this utility model studies and designs a bearing mounting structure. Utility Model Content

[0005] Therefore, this utility model provides a bearing mounting structure that can solve the technical problem in the prior art that the air gap on both sides of the bearing cannot be adjusted to protect the bearing.

[0006] To address the aforementioned problems, this utility model provides a bearing mounting structure, including a rotating shaft. A first bearing and a second bearing are sleeved on the rotating shaft. The rotating shaft has two limiting structures. The first bearing and the second bearing are located between the two limiting structures, and there is a gap between the first bearing, the second bearing, and the limiting structures. The first bearing is sleeved on a second mounting base, and the second bearing is sleeved on a first mounting base. A second washer is provided between the first bearing and the second bearing. The first mounting base is sleeved on a base. Along the axial direction of the rotating shaft, a first washer is provided at the end of the base.

[0007] In some embodiments, the inner rings of the first bearing and the second bearing are fitted onto the rotating shaft, the outer ring of the first bearing is fitted into the second mounting seat, the outer ring of the second bearing is fitted into the first mounting seat, the inner wall of the first mounting seat has a protrusion, and the first bearing, the second bearing and the protrusion are arranged sequentially along the axial direction of the rotating shaft, with the end of the outer ring of the second bearing abutting against the protrusion.

[0008] In some embodiments, a cover plate is further fitted inside the mounting base, the first bearing is located between the cover plate and the second bearing, the cover plate abuts against the outer ring end of the first bearing, and the cover plate is connected to the second mounting base through the fastener.

[0009] In some embodiments, the rotating shaft has a stepped structure, the stepped structure including a first segment, a second segment and a third segment, arranged sequentially along the axial direction of the rotating shaft, the diameters of the first segment, the second segment and the third segment increasing sequentially, the first bearing and the second bearing located on the second segment, and the gap between the inner ring end of the second bearing and the third segment, the step formed between the second segment and the third segment constituting a limiting structure.

[0010] In some embodiments, a retaining ring is fitted onto the first segment. The retaining ring is L-shaped, and the inner ring end of the first bearing has the gap with the retaining ring. The retaining ring constitutes another limiting structure.

[0011] In some embodiments, the cover plate at least partially abuts against the base, the first washer is located between the cover plate and the base, and the fastener passes through the second mounting base and the second washer in sequence before being connected to the first mounting base.

[0012] In some embodiments, the gap between the first bearing and one of the limiting structures is D1, the gap between the second bearing and the other limiting structure is D2, the thickness of the first washer along the axial direction of the rotating shaft is L1, the thickness of the second washer is L2, and the preset gap is D0, which satisfies the following: when D1+D2=2D0, the thickness L1 of the first washer is adjusted; when D1+D2≠2D0, the thickness L2 of the second washer is adjusted.

[0013] In some implementations, when D1+D2=2D0, if D1>D2, the thickness L1 of the first washer is increased; otherwise, the thickness L1 of the first washer is decreased.

[0014] In some implementations, when D1+D2≠2D0, or when D1+D2>2D0, the thickness L2 of the second washer is increased; otherwise, the thickness L2 of the second washer is decreased.

[0015] The bearing mounting structure provided by this utility model has the following beneficial effects:

[0016] By using the first and second washers, and adjusting the second washer, the sum of the air gaps on both sides of the first and second bearings changes. Compared with conventional installation methods, this method can effectively adjust the total length of the protective bearing, more accurately adjust the air gap values ​​on both sides, avoid repeated machining and precision impact on the rotor, and greatly reduce the difficulty of adjustment. Attached Figure Description

[0017] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0018] Figure 1 This is a sectional view of the bearing mounting structure of this utility model;

[0019] Figure 2 This is an exploded view of the bearing mounting structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the bearing mounting structure of this utility model.

[0021] The attached figures are labeled as follows:

[0022] 1. Base; 2. First mounting seat; 3. Second washer; 4. Second bearing; 5. Rotating shaft; 6. Cover plate; 7. First washer; 8. Second mounting seat; 9. Fixing component; 10. First bearing; 11. Retaining ring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms 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 on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0025] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0026] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0027] See also Figure 1-3 As shown, according to an embodiment of the present invention, a bearing mounting structure is provided, comprising: a rotating shaft 5, on which a first bearing 10 and a second bearing 4 are sleeved, the rotating shaft 5 having two limiting structures, the first bearing 10 and the second bearing 4 being located between the two limiting structures, and a gap between the first bearing 10, the second bearing 4 and the limiting structures, the first bearing 10 being sleeved on a second mounting seat 8, the second bearing 4 being sleeved on a first mounting seat 2, a second washer 3 being provided between the first bearing 10 and the second bearing 4, the first mounting seat 2 being sleeved on a base 1, and a first washer 7 being provided at the end of the base 1 along the axial direction of the rotating shaft 5.

[0028] In this technical solution, by adjusting the second washer 3 through the first washer 7 and the second washer 3, the sum of the air gaps on both sides of the first bearing 10 and the second bearing 4 changes. Compared with the conventional installation method, it can effectively adjust the total length of the protective bearing, adjust the protective air gap value on both sides more accurately, and avoid repeated processing and precision impact on the rotor part during adjustment, and greatly reduce the difficulty of adjustment.

[0029] In some embodiments, the inner rings of the first bearing 10 and the second bearing 4 are fitted onto the rotating shaft 5, the outer ring of the first bearing 10 is fitted into the second mounting seat 8, the outer ring of the second bearing 4 is fitted into the first mounting seat 2, the inner wall of the first mounting seat 2 has a protrusion, and along the axial direction of the rotating shaft 5, the first bearing 10, the second bearing 4 and the protrusion are arranged in sequence, and the end of the outer ring of the second bearing 4 abuts against the protrusion.

[0030] In this technical solution, the protrusion serves as an axial limit for the outer ring of the second bearing 4, ensuring the stable installation of the second bearing 4 and the first bearing 10.

[0031] In some embodiments, a cover plate 6 is also fitted inside the mounting base 2, the first bearing 10 is located between the cover plate 6 and the second bearing 4, the cover plate 6 abuts against the outer ring end of the first bearing 10, and the cover plate 6 is connected to the second mounting base 8 through the fastener 9.

[0032] In this technical solution, the outer rings of the second bearing 4 and the first bearing 10 are limited by the cover plate 6 and the protrusion, thereby installing the second bearing 4 and the first bearing 10 in the mounting base. The inner diameter of the cover plate 6 is not greater than the inner diameter of the outer ring of the first bearing 10.

[0033] In some embodiments, the rotating shaft 5 has a stepped structure, the stepped structure including a first segment, a second segment and a third segment, arranged sequentially along the axial direction of the rotating shaft 5, the diameters of the first segment, the second segment and the third segment increasing sequentially, the first bearing 10 and the second bearing 4 located on the second segment, and the gap between the inner ring end of the second bearing 4 and the third segment, the step formed between the second segment and the third segment constitutes a limiting structure.

[0034] In this technical solution, the step formed between the second segment and the third segment, i.e. the shoulder position, axially limits the inner ring of the second bearing 4, and a protective air gap is formed between the shoulder position and the inner ring of the second bearing 4.

[0035] This utility model's bearing mounting structure is simple in structure, highly adjustable, and suitable for various installation positions. The mounting base allows for precise adjustment of the air gap on both sides of the bearing, supporting not only the distribution and adjustment of the air gap values ​​on both sides but also control of the sum of the air gaps on both sides. Furthermore, this design eliminates the need to change the rotor dimensions, avoiding repetitive machining and impacts on precision. Simultaneously, axial positioning can be achieved by replacing the bearing back retainer ring with a shaft shoulder, reducing rotor machining steps and the number of parts.

[0036] In some embodiments, a retaining ring 11 is fitted on the first segment. The retaining ring 11 is L-shaped, and the inner ring end of the first bearing 10 has the gap with the retaining ring 11. The retaining ring 11 constitutes another limiting structure.

[0037] In this technical solution, a protective air gap is formed between the inner ring end of the first bearing 10 and the retaining ring 11, which improves the installation reliability and practicality of the protective bearing.

[0038] The bearing mounting structure of this utility model, through the second washer 3, achieves the function of adjusting the total length of the protective bearing. Even if the air gaps on both sides exceed or fall below the design range, the air gaps on both sides can still be adjusted to a reasonable range. This design structure is simple, easy to install, and suitable for various protective bearing mounting positions. At the same time, it avoids repeated processing of rotor parts, ensures the dynamic balance and control accuracy of the rotor, and significantly reduces the difficulty of adjustment.

[0039] In some embodiments, the first washer 7 is located between the base 1 and the mounting base 2 along the axial direction of the rotating shaft 5.

[0040] In this technical solution, the first washer 7 can be installed between the base 1 and the cover plate 6. By adjusting the thickness of the first washer 7, the relative position of the bearing assembly and the rotating shaft can be adjusted.

[0041] This utility model's bearing mounting structure, through the cooperative design of the protective bearing housing and protective bearing cover, significantly improves the ease of disassembly and assembly of the protective bearing, thereby enhancing its replaceability and facilitating maintenance and replacement. By adjusting the position of the first washer 7, the distance between the entire protective bearing and the upper limit shoulder of the rotor can be effectively changed, thus achieving a balance in the size of the protective air gaps on both sides and ensuring uniform air gaps on both sides. By controlling and adjusting the thickness of the second washer 3, the relative position between the two protective bearings can be flexibly adjusted, thereby adjusting their total length and precisely controlling the sum of the protective air gaps on both sides. This design effectively prevents the air gaps on both sides from simultaneously exceeding or falling below the design range, ensuring that the air gap parameters meet the requirements. It not only allows for precise adjustment of the protective air gaps on both sides of the protective bearing but also avoids repeated machining of the rotor, reducing the impact on rotor accuracy. This design greatly simplifies the adjustment process while improving the installation reliability and practicality of the protective bearing.

[0042] Furthermore, since protective bearings are typically used in pairs and are identical in size, the corresponding first mounting base 2 and second mounting base 8 have the same structure and dimensions in specific implementations, allowing for mass production and strong substitutability. Moreover, adjustments only require modifying the thickness of the second washer 3 to accommodate different protective bearing lengths in design schemes.

[0043] In some embodiments, the gap between the first bearing 10 and one of the limiting structures is D1, the gap between the second bearing 4 and the other limiting structure is D2, the thickness of the first washer 7 along the axial direction of the rotating shaft 5 is L1, the thickness of the second washer 3 is L2, and the preset gap is D0. This satisfies the following conditions: when D1 + D2 = 2D0, the thickness L1 of the first washer 7 is adjusted; when D1 + D2 ≠ 2D0, the thickness L2 of the second washer 3 is adjusted. When D1 + D2 = 2D0, if D1 > D2, the thickness L1 of the first washer 7 is increased; otherwise, the thickness L1 of the first washer 7 is decreased. When D1 + D2 ≠ 2D0, if D1 + D2 > 2D0, the thickness L2 of the second washer 3 is increased; otherwise, the thickness L2 of the second washer 3 is decreased.

[0044] In this technical solution, when the first washer 7 is located between the base 1 and the cover plate 6, the adjustment is based on the design requirement of the protective air gap size D0. The left and right protective air gaps D1 and D2 can be adjusted by adjusting the thickness L1 of the first washer 7 and the thickness L2 of the second washer 3. The specific adjustment method is as follows depending on different initial conditions.

[0045] Initial condition 1: When the sum of the initial protective air gaps on both sides D1+D2=2D0, that is, the total length of the protective bearing meets the design requirements, the size distribution of the air gaps on both sides of the protective bearing needs to be adjusted. The relative position of the protective bearing assembly and the rotating shaft can be adjusted by adjusting the thickness L1 of the first washer 7. If D1>D2, the thickness L1 of the first washer 7 is increased, and vice versa.

[0046] Initial condition two: When the sum of the initial protective air gaps on both sides, D1 + D2, is not equal to 2D0, it means that adjusting only the thickness L1 of the first washer 7 cannot meet the design requirements. Therefore, the total length of the protective bearing needs to be adjusted. In this case, the thickness L2 of the second washer 3 needs to be adjusted. If D1 + D2 > 2D0, the thickness L2 of the second washer 3 needs to be increased; otherwise, the thickness L2 of the second washer 3 needs to be decreased. When D1 + D2 = 2D0, the adjustment operation can be performed according to initial condition one.

[0047] This magnetic levitation bearing bracket has a simple structure, flexible installation, and is easy to assemble and disassemble. Compared with conventional installation methods, it can effectively adjust the overall length of the protective bearing, more precisely adjust the air gap values ​​on both sides, and avoid repeated machining of the rotor and impact on precision during adjustment, greatly reducing the difficulty of adjustment. At the same time, the shaft shoulder can be used directly instead of the bearing retaining ring for axial positioning, reducing the number of parts required for machining.

[0048] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0049] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A bearing mounting structure characterized by: include: A rotating shaft (5) is fitted with a first bearing (10) and a second bearing (4). The rotating shaft (5) has two limiting structures. The first bearing (10) and the second bearing (4) are located between the two limiting structures. There is a gap between the first bearing (10), the second bearing (4) and the limiting structure. The first bearing (10) is fitted on a second mounting seat (8). The second bearing (4) is fitted on a first mounting seat (2). A second washer (3) is provided between the first bearing (10) and the second bearing (4). The first mounting seat (2) is fitted on a base (1). Along the axial direction of the rotating shaft (5), a first washer (7) is provided at the end of the base (1). The rotating shaft (5) has a stepped structure, which includes a first section, a second section and a third section. Along the axial direction of the rotating shaft (5), the first section, the second section and the third section are arranged in sequence, and the diameters of the first section, the second section and the third section increase in sequence. The first bearing (10) and the second bearing (4) are located on the second section, and there is a gap between the inner ring end of the second bearing (4) and the third section. The step formed between the second section and the third section constitutes a limiting structure. A retaining ring (11) is fitted on the first segment. The retaining ring (11) is L-shaped. The inner ring end of the first bearing (10) has the gap with the retaining ring (11). The retaining ring (11) constitutes another limiting structure.

2. The bearing mounting structure according to claim 1, characterized by: The inner rings of the first bearing (10) and the second bearing (4) are fitted on the rotating shaft (5). The outer ring of the first bearing (10) is fitted inside the second mounting seat (8). The outer ring of the second bearing (4) is fitted inside the first mounting seat (2). The inner wall of the first mounting seat (2) has a protrusion. Along the axial direction of the rotating shaft (5), the first bearing (10), the second bearing (4) and the protrusion are arranged in sequence. The end of the outer ring of the second bearing (4) abuts against the protrusion.

3. The bearing mounting structure according to claim 1, characterized by: The mounting base (2) is also fitted with a cover plate (6), the first bearing (10) is located between the cover plate (6) and the second bearing (4), the cover plate (6) abuts against the outer ring end of the first bearing (10), and the cover plate (6) is connected to the second mounting base (8) by a fastener (9).

4. The bearing mounting structure according to claim 3, characterized by: The cover plate (6) at least partially abuts against the base (1), the first washer (7) is located between the cover plate (6) and the base (1), and the fastener (9) passes through the second mounting seat (8) and the second washer (3) in sequence and is connected to the first mounting seat (2).

5. The bearing mounting structure according to claim 1, characterized by The gap between the first bearing (10) and one of the limiting structures is D1, the gap between the second bearing (4) and another limiting structure is D2, along the axial direction of the rotating shaft (5), the thickness of the first washer (7) is L1, the thickness of the second washer (3) is L2, and the preset gap is D0. It satisfies the following: when D1+D2=2D0, the thickness L1 of the first washer (7) is adjusted; when D1+D2≠2D0, the thickness L2 of the second washer (3) is adjusted.

6. The bearing mounting structure according to claim 5, characterized by When D1+D2=2D0, if D1>D2, increase the thickness L1 of the first washer (7), otherwise decrease the thickness L1 of the first washer (7).

7. The bearing mounting structure according to claim 5, characterized by When D1+D2≠2D0, the thickness L2 of the second washer (3) is increased when D1+D2>2D0, and the thickness L2 of the second washer (3) is decreased when D1+D2>2D0.

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