A radial dynamic pressure air bearing, a motor, and an air compressor

Abstract

This invention relates to the field of hydrodynamic gas bearing technology, specifically to a radial hydrodynamic air bearing, a motor, and an air compressor. The radial hydrodynamic air bearing includes a bearing housing and an arch foil. The arch foil is mounted on the bearing housing and provides support for the rotor. The arch foil has two or more segments, arranged sequentially along the axial direction of the bearing housing, and each segment is detachable from the bearing housing. According to the technical solution of this invention, the arch foil segments are arranged in an array along the axial and circumferential directions of the bearing housing. Arch foil segments with different stiffnesses can be provided in the axial and circumferential directions as needed, achieving variable stiffness of the arch foil in both directions. This facilitates differentiated bearing pressure, coordinates arch foil deformation, and improves bearing performance. Furthermore, the detachable assembly method of the arch foil significantly reduces the assembly precision requirements of the bearing and the replacement cost in case of abnormal deformation. When the arch foil is damaged, only the damaged part needs to be replaced, eliminating the need for complete replacement, saving costs and extending the overall lifespan of the equipment.

Description

Technical Field

[0001] This invention relates to the field of dynamic pressure gas bearing technology, and in particular to a radial dynamic pressure air bearing, a motor, and an air compressor. Background Technology

[0002] like Figure 1 As shown, the existing radial dynamic pressure air bearing includes a bearing housing 1, an arch foil 2, and a top foil 3 arranged coaxially from the outside to the inside. Multiple sets of arch foils 2 and top foils 3 are separately arranged along the circumference of the bearing housing 1. Each set of top foils 3 is connected to one end of the arch foil 2 and fixed to the bearing housing 1 through this end, while the other end extends along the inner circumferential wall of the bearing housing 1 to form a free end. A gap 4 is left between adjacent sets of top foils 3 and arch foils 2. In this design, the arch foils 2 and top foils 3 are separately arranged. The gap 4 between adjacent sets of arch foils 2 and top foils 3 can accommodate a certain degree of elastic deformation, increasing the load-bearing capacity. Furthermore, the separate arrangement means that if some arch foils 2 or top foils 3 are damaged, only partial replacement is needed, eliminating the need for complete replacement, saving costs and extending the overall lifespan of the equipment.

[0003] The arch foil 2 is a single, integral structure in the axial direction, making it impossible to achieve variable stiffness in the axial direction to improve bearing performance. Furthermore, when partial damage occurs to the arch foil 2 in the axial direction, the entire structure needs to be replaced, resulting in high maintenance costs. Summary of the Invention

[0004] In view of this, the present invention provides a radial dynamic pressure air bearing, a motor and an air compressor. The main technical problem to be solved is: how to enable the bearing to achieve variable stiffness in the axial direction and improve the bearing performance.

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

[0006] In a first aspect, embodiments of the present invention provide a radial dynamic pressure air bearing, which includes a bearing housing and an arch foil, the arch foil being disposed on the bearing housing and providing support for the rotor;

[0007] The arch foil has two or more arch foil segments, each arch foil segment is arranged sequentially along the axial direction of the bearing seat, and each arch foil segment can be disassembled relative to the bearing seat.

[0008] In some embodiments, the arch foil segments are also arranged sequentially along the circumference of the bearing housing.

[0009] In some embodiments, the inner side of the bearing housing is provided with a recessed limiting groove, the number of the limiting grooves being equal to the number of arch foil segments, each arch foil segment being installed in the corresponding limiting groove in a one-to-one correspondence, and each protruding from the corresponding limiting groove.

[0010] In some embodiments, each of the limiting grooves has a first slot at one end along the circumference of the bearing seat on its bottom surface, and each of the arch foil segments has a first protrusion at one end along the circumference of the bearing seat. Each of the arch foil segments is inserted into the corresponding first slot through the first protrusion, so as to install each arch foil segment in the corresponding limiting groove and make each arch foil segment detachable relative to the bearing seat.

[0011] In some embodiments, each of the limiting grooves has two or more groove depths;

[0012] And / or, each of the limiting grooves has two or more groove widths;

[0013] And / or, each of the aforementioned limiting grooves has two or more central angles;

[0014] And / or, each of the limiting grooves has two or more axial groove spacings;

[0015] And / or, each of the limiting grooves has two or more circumferential groove spacings.

[0016] In some implementations, each arch foil segment has two or more pitches;

[0017] And / or, each arch segment has two or more arch heights;

[0018] And / or, each arched foil segment has two or more waveforms.

[0019] In some embodiments, the radial dynamic pressure air bearing further includes a top foil for being disposed on one side of the arch foil near the center of the bearing housing; the arch foil provides support for the rotor through the top foil;

[0020] The top foil is detachable from the bearing housing.

[0021] In some embodiments, the bearing housing has a second slot on its inner side, and one end of the top foil has a second protrusion. The top foil is inserted into the second slot through the second protrusion, so that the top foil can be disassembled relative to the bearing housing.

[0022] The bearing housing is provided with a fixing hole on one side of the axial direction that connects to the second slot. The fixing pin is used to insert into the fixing hole to secure the second protrusion against the slot wall of the second slot.

[0023] Secondly, embodiments of the present invention provide an electric motor that may include any of the radial dynamic pressure air bearings described above.

[0024] Thirdly, embodiments of the present invention provide an air compressor that may include the motor described above.

[0025] By employing the above technical solutions, the radial dynamic pressure air bearing, motor, and air compressor of the present invention have at least the following beneficial effects:

[0026] 1. In the technical solution provided by the present invention, since each arch foil segment arranged along the bearing seat axial direction is detachable, arch foil segments with different stiffnesses can be set in the axial direction as needed to achieve variable stiffness of the arch foil in the axial direction and improve bearing performance.

[0027] 2. Since each arch foil segment is arranged sequentially along the circumference of the bearing housing, arch foil segments with different stiffnesses can be set in the axial and circumferential directions according to requirements, realizing the variable stiffness of the arch foil in the axial and circumferential directions, which is beneficial for differentiating bearing pressure, coordinating arch foil deformation, and improving bearing performance.

[0028] 3. The detachable assembly method of the arch foil can significantly reduce the assembly precision requirements of the bearings and the replacement cost in case of abnormal deformation. When the arch foil is damaged, only the damaged part needs to be replaced, instead of replacing the whole unit, saving costs and extending the overall life of the equipment.

[0029] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a radial dynamic pressure air bearing in the prior art;

[0032] Figure 2 This is a cross-sectional view of a radial hydrodynamic air bearing provided in an embodiment of the present invention;

[0033] Figure 3 yes Figure 2 Enlarged diagram of point A in the middle.

[0034] Figure 4 This is a sectional view of the longitudinal section of a radial hydrodynamic air bearing;

[0035] Figure 5 This is a cross-sectional view of the radial dynamic pressure air bearing from another perspective, showing its longitudinal section.

[0036] Reference numerals: 1. Bearing housing; 2. Fixing hole; 3. Second slot; 4. First slot; 5. Limiting groove; 6. Arched foil section; 7. Top foil; 61. First protruding edge. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0038] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0039] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0040] like Figures 2 to 4 As shown, an embodiment of the present invention provides a radial dynamic pressure air bearing, which includes a bearing housing 1 and an arch foil. The arch foil is disposed on the bearing housing 1 and provides support for the rotor. The arch foil has two or more arch foil segments 6. Each arch foil segment 6 is arranged sequentially along the axial direction of the bearing housing 1, and each arch foil segment 6 is detachable relative to the bearing housing 1.

[0041] In the above example, since each arch foil segment 6 arranged along the axial direction of the bearing housing 1 is detachable, arch foil segments 6 with different stiffnesses can be set in the axial direction as needed to achieve variable stiffness of the arch foil in the axial direction and improve bearing performance.

[0042] Furthermore, the aforementioned arch foil segments 6 are arranged sequentially along the circumference of the bearing housing 1, thus the aforementioned arch foil segments 6 are arranged in an array along the axial and circumferential directions of the bearing housing 1. For example, in a specific application example, the arch foil has n rows in the axial direction, and each row has m arch foil segments 6 in the circumferential direction, thus the arch foil segments 6 form an n*m array along the axial and circumferential directions of the bearing housing 1.

[0043] In the above example, since each arch foil segment 6 can be disassembled relative to the bearing housing 1, arch foil segments 6 with different stiffnesses can be set in the axial and circumferential directions as needed, realizing variable stiffness of the arch foil in the axial and circumferential directions, which is beneficial for differentiating bearing pressure, coordinating arch foil deformation, improving bearing performance, and extending bearing service life.

[0044] In addition, the detachable assembly method of the arch foil can significantly reduce the assembly precision requirements of the bearings and the replacement cost in case of abnormal deformation. When the arch foil is damaged, only the damaged part needs to be replaced, instead of replacing the whole unit, saving costs and extending the overall life of the equipment.

[0045] like Figure 4 As shown, the inner side of the aforementioned bearing housing 1 may be provided with recessed limiting grooves 5, and the number of limiting grooves 5 is equal to the number of arch foil segments 6. Each arch foil segment 6 is used to be installed in the corresponding limiting groove 5 in a one-to-one correspondence, and each protrudes from the corresponding limiting groove 5. The limiting groove 5 stops and limits the arch foil segments 6 inside the bearing housing 1 by means of the groove wall along the axial and / or circumferential direction.

[0046] In the above example, by setting the limiting groove 5 to limit the arch foil segment 6, the arch foil segment 6 can work within the range defined by the limiting groove 5, preventing the arch foil segment 6 from shifting during operation, which is beneficial to improving the stability of each arch foil segment 6 during operation.

[0047] To achieve the effect that each of the aforementioned arch foil segments 6 can be disassembled relative to the bearing housing 1, such as Figure 3 and Figure 4 As shown, each of the aforementioned limiting grooves 5 has a first retaining groove 4 at one end along the circumference of the bearing seat 1 on its bottom surface. Each arch foil segment 6 has a first protruding edge 61 at one end along the circumference of the bearing seat 1. Each arch foil segment 6 is inserted into the corresponding first retaining groove 4 through the first protruding edge 61 to install each arch foil segment 6 in the corresponding limiting groove 5, and to allow each arch foil segment 6 to be disassembled relative to the bearing seat 1.

[0048] The first protruding edge 61 can be inserted into the first slot 4 to engage with it. The first protruding edge 61 can also be pulled out of the first slot 4 to remove the arched foil section 6 from the bearing seat 1.

[0049] It should be noted that the first protruding edge 61 mentioned above can be a bent portion integrally formed at one end of the arched foil segment 6. The width and depth of the first slot 4 are precisely designed to accommodate the first protruding edge 61, preventing axial and circumferential movement of the arched foil segment 6.

[0050] The aforementioned limiting grooves 5 can have two or more groove depths, so that the variable stiffness of the bearing can be adjusted by adjusting the groove depth of the limiting grooves 5. Specifically, for example, the groove depth h of the limiting groove 5 corresponding to the bearing bearing area can be appropriately increased. When the groove depth and arch foil height of the other limiting grooves 5 are the same, a high-pressure area will be formed in the bearing bearing area during operation, which will effectively improve the bearing bearing performance.

[0051] Each of the aforementioned limiting grooves 5 can have two or more groove widths, so that the variable stiffness of the bearing can be adjusted by adjusting the groove width of the limiting groove 5. Specifically, the larger the groove width of the limiting groove 5, the larger the width of its corresponding arch foil section 6, and the greater the stiffness.

[0052] Each of the aforementioned limiting grooves 5 can have two or more central angles, so that the stiffness of the bearing can be adjusted by adjusting the central angle of the limiting groove 5. Specifically, the larger the central angle of the limiting groove 5, the longer the corresponding arch foil section 6, and the greater the stiffness.

[0053] Each of the aforementioned limiting grooves 5 can have two or more axial groove spacings, so that the variable stiffness of the bearing can be adjusted by adjusting the axial groove spacing of the limiting grooves 5. Specifically, the larger the axial groove spacing, the larger the local stiffness blank area formed in the corresponding area, and the smaller the stiffness.

[0054] Each of the aforementioned limiting grooves 5 can have two or more circumferential groove spacings, so that the variable stiffness of the bearing can be adjusted by adjusting the circumferential groove spacing of the limiting grooves 5. Specifically, the larger the circumferential groove spacing, the larger the local stiffness blank area formed in the corresponding area, and the smaller the stiffness.

[0055] Since the number of limiting grooves 5 is equal to the number of arch foil segments 6 and corresponds one-to-one, when each arch foil segment 6 is arranged in an array along the axial and circumferential directions of the bearing seat 1, each limiting groove 5 is also arranged in an array along the axial and circumferential directions of the bearing seat 1. In a specific application example, each limiting groove 5 forms n rows in the axial direction, and each row has m limiting grooves 5 in the circumferential direction. For example... Figure 3 and Figure 5 As shown, the width of each limiting groove 5 is a. ij (i = 1, 2, 3...n; j = 1, 2,...m), the axial groove spacing width between two adjacent limiting grooves 5 in the axial direction is b. ij (i = 1, 2, 3...n-1; j = 1, 2,...m), the central angle of each limiting groove 5 is θ.ij (i = 1, 2, 3...n; j = 1, 2,...m), the circumferential groove spacing between two adjacent limiting grooves 5 in the circumferential direction is c. ij (i = 1, 2, 3...nj)(i = 1, 2, 3...n; j = 1, 2,...m), the groove depth of each limiting groove 5 is h. ij (i = 1, 2, 3...n; j = 1, 2,...m). The groove width a of the limiting groove 5 is... ij The groove depth h of the limiting groove 5 ij The central angle θ of the limiting groove 5 ij axial groove spacing b of limiting groove 5 ij and the circumferential groove spacing c of the limiting groove 5 ij These five parameters collectively affect the performance of the radial dynamic pressure air bearing, and the value of each parameter can be determined based on the application effect. Preferably, n equals 3, and the axial groove spacing b of the limiting groove 5... ij and the circumferential groove spacing c of the limiting groove 5 ij The value should be as small as possible (less than 1 mm), and the size of m and the central angle θ of the limiting groove 5 should be considered. ij The specific dimensions can be divided according to the specific load-bearing requirements, with the principle being to improve the load-bearing effect of the arch foil. The groove depth h of the aforementioned limiting groove 5... ij The difference between the arch height and deformation amount of the arch foil section 6 must be less than the difference between the arch height and deformation amount to ensure that the top foil 7 of the bearing does not come into frictional contact with the bearing housing 1 during deformation.

[0056] The aforementioned arched foil segments 6 are distributed along the axial and circumferential directions of the bearing housing 1, together forming the arched foil of the bearing. Figure 3 A schematic diagram is shown of an arched foil segment 6 installed within a limiting groove 5. The axial and circumferential stiffness of the radial dynamic pressure air bearing of this invention can be adjusted by changing the arch height of the arched foil segment 6 or the groove depth of the limiting groove 5. For example, the groove depth h of the limiting groove 5 corresponding to the bearing's load-bearing area can be appropriately increased. With the groove depths of the remaining limiting grooves 5 and the height of the arched foil segment 6 being consistent, a high-pressure zone will be formed in the load-bearing area during operation, effectively improving the bearing's load-bearing capacity. Similarly, when the structural parameters of each limiting groove 5 of the bearing are consistent, the arch height of the arched foil segment 6 in the load-bearing area can be appropriately reduced to achieve the purpose of forming a high-pressure zone and improving the load-bearing capacity.

[0057] The axial and circumferential groove spacing of the aforementioned limiting grooves 5 affects the structural layout of the bearing. Excessive axial and circumferential groove spacing creates localized stiffness gaps, which can easily lead to unstable operation and bearing failure. Therefore, the axial and circumferential groove spacing of the limiting grooves 5 should be correctly selected. The central angle of the limiting groove 5 and the corresponding central angle of the arch foil segment 6 will affect the stiffness distribution of the bearing in the axial and circumferential directions. A well-distributed stiffness distribution is beneficial for differentiating bearing pressure, coordinating arch foil deformation, improving performance, and extending bearing service life.

[0058] Each of the aforementioned arched foil sections 6 may have two or more pitches, so that the bearing stiffness can be adjusted by adjusting the pitch of the arched foil section 6. Each of the aforementioned arched foil sections 6 may have two or more arch heights, so that the bearing stiffness can be adjusted by adjusting the arch height of the arched foil section 6. Each of the aforementioned arched foil sections 6 may have two or more waveforms, so that the bearing stiffness can be adjusted by adjusting the waveform of the arched foil section 6.

[0059] In the above example, the structural parameters of the bearing housing 1 in the non-load-bearing area can be made consistent. By changing the pitch, arch height, or waveform of the arch foil segment 6 in the bearing load-bearing area, the stiffness of the bearing arch foil in the bearing load-bearing area can be increased, which can effectively improve the bearing load-bearing effect.

[0060] like Figure 2 As shown, the aforementioned radial dynamic pressure air bearing may further include a top foil 7, which is disposed on the side of the arch foil near the center of the bearing housing 1. The arch foil provides support to the rotor via the top foil 7. The top foil 7 is detachable relative to the bearing housing 1.

[0061] In the example above, the support effect on the rotor can be improved by setting the top foil 7.

[0062] To achieve the aforementioned technical effect that the top foil 7 can be detached from the bearing housing 1, such as... Figure 4 As shown, the inner side of the aforementioned bearing housing 1 may be provided with a second slot 3, and one end of the top foil 7 is provided with a second protrusion. The top foil 7 is inserted and engaged with the second slot 3 through the second protrusion, so that the top foil 7 can be disassembled relative to the bearing housing 1.

[0063] The second protruding edge can be inserted into the second slot 3 to engage with it. The second protruding edge can also be pulled out of the second slot 3 to remove the top foil 7 from the bearing seat 1.

[0064] It should be noted that the aforementioned second protrusion can be a bent portion integrally formed at one end of the top foil 7. The width and depth of the second slot 3 precisely accommodate the second protrusion, preventing axial and circumferential movement of the top foil 7.

[0065] like Figure 4 As shown, the aforementioned bearing housing 1 may also have a fixing hole 2 on one side of its axial direction, which communicates with the second slot 3. A fixing pin is used to insert into the fixing hole 2 to secure the second protrusion against the groove wall of the second slot 3, thereby fixing the top foil 7 and improving the installation stability of the top foil 7.

[0066] An embodiment of the present invention also proposes an electric motor that may include any of the radial dynamic pressure air bearings described above. Because the electric motor employs the aforementioned radial dynamic pressure air bearing, each arch foil segment 6 arranged axially along the bearing housing 1 is detachable, allowing for the provision of arch foil segments 6 with different stiffnesses in the axial direction as needed, thereby achieving variable stiffness of the arch foil in the axial direction and improving bearing performance.

[0067] An embodiment of the present invention also proposes an air compressor that may include any of the motors described above. Because the air compressor uses the aforementioned motor, each arch foil segment 6 arranged axially along the bearing housing 1 is detachable, allowing for the provision of arch foil segments 6 with different stiffnesses in the axial direction as needed, thereby achieving variable stiffness of the arch foil in the axial direction and improving bearing performance.

[0068] For ease of understanding, the overall structure of the present invention will be described below, and its working principle will be explained.

[0069] The present invention relates to the design of a radial dynamic pressure air bearing, which can be applied to motors and air compressors. The radial dynamic pressure air bearing includes a bearing housing 1, an arch foil, and a top foil 7. The bearing housing 1 is provided with a fixing hole 2, a first retaining groove 4, a second retaining groove 3, and a limiting groove 5.

[0070] The aforementioned arched foil has multiple arched foil segments 6 along the circumference and axial direction of the bearing housing 1. The bearing housing 1 has a ring structure, and several limiting grooves 5 with a certain curvature are opened on the inner surface of the bearing housing 1. The limiting grooves 5 are used to install arched foil segments 6 of a certain size. One arched foil segment 6 is placed in each limiting groove 5, and the top foil 7 is attached to the arched foil. The top foil 7 is fixed by the second slot 3 and the fixing hole 2. Each arched foil segment 6 has a first protruding edge 61 at one end. Each arched foil segment 6 is fixed by inserting the first protruding edge 61 at one end into the corresponding first slot 4. The width and depth of the slot 4 are just enough to accommodate the first protruding edge 61, preventing the arched foil segment 6 from moving axially and circumferentially. The installation method of the top foil 7 is similar to that of each arched foil segment 6. The top foil 7 has a second protruding edge at one end. The second protruding edge at one end of the top foil 7 is inserted into the second slot 3, and then fixed by driving in the fixing pin through the fixing hole 2.

[0071] The radial dynamic pressure air bearing of the present invention divides the arch foil into multiple arch foil segments 6 in the axial and circumferential directions of the bearing housing 1, and provides limiting grooves 5 on the bearing housing 1. The number of limiting grooves 5 is equal to the number of arch foil segments 6 and corresponds one-to-one. Each arch foil segment 6 is installed in the corresponding limiting groove 5. By changing the depth, width, and central angle of the limiting grooves 5, or by preparing various types of arch foil segments 6, variable stiffness design of the bearing in the axial and circumferential directions can be achieved. This is beneficial for differentiating bearing pressure, improving bearing performance, and extending bearing service life. In addition, the detachable assembly method of each arch foil segment 6 can significantly reduce the bearing assembly accuracy requirements and replacement costs in case of abnormal deformation.

[0072] The above description is merely a preferred embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A radial dynamic pressure air bearing, characterized in that, It includes a bearing housing (1) and an arch foil, the arch foil being disposed on the bearing housing (1) and providing support for the rotor; the arch foil having two or more arch foil segments (6), each arch foil segment (6) being arranged sequentially along the axial direction of the bearing housing (1), and each arch foil segment (6) being detachable relative to the bearing housing (1); The bearing seat (1) is provided with a limiting groove (5) on its inner side. The number of limiting grooves (5) is equal to the number of arch foil segments (6). Each arch foil segment (6) is used to be installed in the corresponding limiting groove (5) in a one-to-one correspondence, and each protrudes out of the corresponding limiting groove (5). The limiting groove (5) has two or more groove depths; and / or, the limiting groove (5) has two or more groove widths; and / or, the limiting groove (5) has two or more central angles; and / or, the limiting groove (5) has two or more axial groove spacings; and / or, the limiting groove (5) has two or more circumferential groove spacings; so that the bearing has a variable stiffness design and differentiates the bearing pressure.

2. The radial dynamic pressure air bearing as described in claim 1, characterized in that, Each arch foil segment (6) is also arranged sequentially along the circumference of the bearing seat (1).

3. The radial dynamic pressure air bearing as described in claim 1 or 2, characterized in that, Each of the limiting grooves (5) has a first slot (4) at one end along the circumference of the bearing seat (1) on its bottom surface. Each of the arch foil segments (6) has a first protruding edge (61) at one end along the circumference of the bearing seat (1). Each of the arch foil segments (6) is inserted into the corresponding first slot (4) through the first protruding edge (61) to install each arch foil segment (6) in the corresponding limiting groove (5) and to make each arch foil segment (6) detachable from the bearing seat (1).

4. The radial dynamic pressure air bearing as described in claim 1 or 2, characterized in that, Each arch foil segment (6) has two or more pitches; And / or, each arch foil segment (6) has two or more arch heights; And / or, each arch foil segment (6) has more than two waveforms.

5. The radial dynamic pressure air bearing as described in claim 1 or 2, characterized in that, It also includes a top foil (7) for being disposed on one side of the arch foil near the center of the bearing housing (1); the arch foil provides support for the rotor through the top foil (7); The top foil (7) can be detached from the bearing seat (1).

6. The radial dynamic pressure air bearing as described in claim 5, characterized in that, The bearing seat (1) is provided with a second slot (3) on its inner side, and the top foil (7) is provided with a second protrusion at one end. The top foil (7) is inserted into the second slot (3) through the second protrusion so that the top foil (7) can be disassembled relative to the bearing seat (1). The bearing seat (1) is provided with a fixing hole (2) on one side of the axial direction, which is connected to the second slot (3). The fixing pin is used to insert into the fixing hole (2) to fix the second protrusion against the groove wall of the second slot (3).

7. An electric motor, characterized in that, The radial dynamic pressure air bearing includes any one of claims 1 to 6.

8. An air compressor, characterized in that, Includes the motor as described in claim 7.

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