Air foil bearing and compressor including the same

Abstract

An air foil bearing and a compressor including the air foil bearing, which may include a beam plate arranged in a lower portion thereof, a gasket stacked on the beam plate and partially covering a top surface of the beam plate, and a top foil stacked on the gasket, wherein one side of the beam plate is fixed and the other side of the beam plate is movable in its vertical direction.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority from Korean Patent Application No. 10-2020-0117800, filed on September 14, 2020, which is hereby incorporated by reference in its entirety for all purposes. Technical Field

[0003] The present invention relates to an air foil bearing with a novel structure and a compressor comprising the air foil bearing. Background Art

[0004] A bearing is a mechanical element that supports a moving part (rotating body) to enable smooth rotation. There are various types of bearings, such as ball bearings, plain bearings, and air foil bearings. Air foil bearings consist of a base plate, a wave foil, and a top foil. Air foil bearings are characterized by the formation of an air film between the rotating body and the air foil bearing as the rotating body rotates, thereby providing cooling and support for the rotating body. Such air foil bearings are used in various industrial applications. For example, air foil bearings can be used in compressors to supply compressed air to fuel tanks.

[0005] According to related art, when the pressure around the air foil bearing changes due to the air flow generated by the rotation of the rotating body, the top foil pressurizes the bump foil, causing the shape of the pressurized bump foil to change. Therefore, when the rotating body stops rotating, the bump foil returns to its original shape. In other words, the bump foil has an elastic structure that reversibly changes shape in response to external forces.

[0006] Until now, according to the related art, the bump foil has an embossed structure with an uneven surface. Such a bump foil structure that creates an elastic structure acts as a factor that increases the time required to manufacture the air foil bearing.

[0007] The information disclosed in this background technology section of the present invention is only for enhancing understanding of the general background technology of the present invention and is not to be regarded as an admission or any form of suggestion that the information forms the relevant technology already known to those skilled in the art. Summary of the Invention

[0008] Aspects of the present invention are directed to providing an air foil bearing capable of achieving excellent performance even with a simpler structure than the related art, and a compressor including the air foil bearing.

[0009] According to aspects of the present invention, the air foil bearing may include a beam plate provided in a lower portion thereof, wherein one side of the beam plate may be fixed and the other side of the beam plate may be movable in a vertical direction of the beam plate.

[0010] The air foil bearing may further include a shim stacked on the beam plate and partially covering a top surface of the beam plate.

[0011] The air foil bearing may also include a top foil stacked on the shim.

[0012] The shim may include a plurality of shims, and the plurality of shims may be disposed along a perimeter of the top surface of the beam plate.

[0013] The beam plate may have a circular outer periphery, and a through hole may be formed in a central region of the beam plate. The beam plate may include: an outer peripheral region forming the periphery of the beam plate and extending in a circumferential direction of the beam plate; a spacing region provided between the through hole and the outer peripheral region and spaced apart from the outer peripheral region in a radial direction of the beam plate; and a connecting region connecting the outer peripheral region and the spacing region.

[0014] The gasket may include: a first region disposed on an outer peripheral region of the beam plate; a second region connected to the first region and disposed on the spacing region and the connection region of the beam plate; and a third region connected to the second region and disposed on the spacing region.

[0015] The third region may include a plurality of protrusions extending in a circumferential direction thereof.

[0016] The plurality of protrusions may be spaced apart from each other in a radial direction thereof.

[0017] Among the plurality of protrusions, a protrusion located outward in the radial direction may be longer than a protrusion located inward in the radial direction thereof.

[0018] The width of the connecting region in the circumferential direction is the same as the width of a portion of the second region provided between the outer peripheral region and the spacing region in the circumferential direction.

[0019] The beam plate may have a thickness of 0.8 mm to 3.5 mm.

[0020] The top foil may include: an outer peripheral portion provided on an outer peripheral region of the beam plate; an inner portion spaced inwardly from the outer peripheral portion in a radial direction thereof and provided on a spaced region of the beam plate; and a first connecting portion connecting the outer peripheral portion and the inner portion and provided on a connecting region of the beam plate.

[0021] The inner portion may include a plurality of inner members spaced apart from each other in a circumferential direction thereof, and the top foil may further include a second connection portion connecting the plurality of inner members to each other.

[0022] The width of the first connecting portion in the circumferential direction may be smaller than the width of the connecting region in the circumferential direction thereof.

[0023] According to aspects of the present invention, a compressor may include: a housing; and an air foil bearing attached to a surface of the housing, wherein the air foil bearing includes a beam plate partially attached to the surface of the housing, and the beam plate includes: a fixed end region fixed to the housing; and a free end region that moves relative to the housing.

[0024] The compressor may further include a gasket facing the housing, wherein the beam plate is interposed between the housing and the gasket, and the gasket partially covers a top surface of the beam plate.

[0025] The compressor may further include a top foil facing the beam plate, wherein the spacer is interposed between the beam plate and the top foil.

[0026] The beam plate may have a circular outer perimeter, and a through hole may be formed in a central region of the beam plate. The beam plate may include: an outer peripheral region forming the perimeter of the beam plate and extending in a circumferential direction of the beam plate; a spacing region disposed between the through hole and the outer peripheral region and spaced apart from the outer peripheral region in a radial direction of the beam plate; and a connecting region connecting the outer peripheral region and the spacing region. The fixed end region may correspond to the outer peripheral region, and the free end region may correspond to the spacing region and the connecting region.

[0027] The gasket may include a first region facing the peripheral region of the beam plate, a second region connected to the first region and facing the spacing region and the connection region of the beam plate, and a third region connected to the second region and facing the spacing region.

[0028] The compressor may further include a rotating portion facing one surface of the air foil bearing, the one surface of the air foil bearing being opposite to another surface of the air foil bearing facing the housing, wherein the rotating portion may face the spacing area.

[0029] The method and apparatus of the present invention have other features and advantages that will be more apparent or set forth in more detail from the following detailed description and the accompanying drawings incorporated herein, which together serve to explain certain principles of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 shows a plan view of a stacked structure of an air foil bearing according to various exemplary embodiments of the present invention;

[0031] Figure 2 A plan view showing a stacked structure of beams, plates and spacers in an air foil bearing according to various exemplary embodiments of the present invention;

[0032] Figure 3The structure of a local area of ​​a beam plate in an air foil bearing according to various exemplary embodiments of the present invention and the displacement of each area of ​​the beam plate (indicated by color) are shown;

[0033] Figure 4 sectional views showing the structure of a compressor according to various exemplary embodiments of the present invention;

[0034] Figure 5 A cross-sectional view showing an arrangement of an air foil bearing, a housing, and a rotating portion in a compressor according to various exemplary embodiments of the present invention;

[0035] Figure 6 A side sectional view showing the shape of an air foil bearing when a rotating portion does not rotate in a compressor according to various exemplary embodiments of the present invention;

[0036] Figure 7 A side sectional view illustrating a shape of an air foil bearing when a rotating portion rotates in a compressor according to various exemplary embodiments of the present invention.

[0037] It should be understood that the drawings are not necessarily drawn to scale and present a somewhat simplified representation of various features illustrative of the basic principles of the invention. The specific design features of the present invention as disclosed herein, including, for example, specific dimensions, orientations, positions, and shapes, will be determined in part by the particular intended application and use environment.

[0038] In the drawings, reference numbers refer to the same or equivalent parts of the present invention throughout the several figures of the drawing. DETAILED DESCRIPTION

[0039] Reference will now be made in detail to various embodiments of the present invention, examples of which are illustrated in the accompanying drawings and described below. Although the present invention will be described in conjunction with exemplary embodiments thereof, it should be understood that the present invention is not intended to limit the invention to those exemplary embodiments. On the other hand, the present invention is intended to cover not only the exemplary embodiments of the present invention, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the present invention as defined by the appended claims.

[0040] Hereinafter, an air foil bearing and a compressor including the same according to exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0041] Air foil bearings

[0042] Figure 1 shows a plan view of a stacked structure of an air foil bearing according to various exemplary embodiments of the present invention, and Figure 2 A plan view illustrating a stacked structure of beams and shims in an air foil bearing according to various exemplary embodiments of the present invention is shown. Figure 3 The structures of local regions of a beam plate in an air foil bearing according to various exemplary embodiments of the present invention and the displacement of each region of the beam plate are shown.

[0043] refer to Figure 1 、 Figure 2 and Figure 3 According to various exemplary embodiments of the present invention, the air foil bearing 10 may have a structure in which multiple elements are stacked vertically. The air foil bearing 10 may include a beam plate 100 disposed in the lower portion of the air foil bearing, a shim 200 stacked on the beam plate 100 and partially covering the top surface of the beam plate 100, and a top foil 300 stacked on the shim 200. In other words, the air foil bearing 10 according to various exemplary embodiments of the present invention may have a stacked structure in which the beam plate 100, the shim 200, and the top foil 300 are stacked in order from bottom to top. Furthermore, the beam plate 100, the shim 200, and the top foil 300 forming the air foil bearing 10 according to various exemplary embodiments of the present invention may all have smooth surfaces. Therefore, a separate process for forming an uneven surface (i.e., an embossed structure) may not be required to manufacture the air foil bearing 10 according to various exemplary embodiments of the present invention.

[0044] In this case, it can be determined visually whether the component has a smooth surface.

[0045] As can be seen from the component names, the shim 200 and the top foil 300 can be significantly thinner than the beam plate 100. Therefore, compared to the stiffness of the beam plate 100, the shim 200 and the top foil 300 can have significantly lower physical stiffness. For the purposes of the following description, the beam plate 100 can be reversibly bent in response to pressure changes around the beam plate. The beam plate 100 can have a thickness of 0.8 mm to 3.5 mm. When the thickness of the beam plate 100 is less than 0.8 mm, the stiffness of the beam plate 100 may be too low, which may cause durability issues for the air foil bearing 10. When the thickness of the beam plate 100 exceeds 3.5 mm, the beam plate 100 may not be able to effectively bend in response to pressure changes.

[0046] At the same time, if Figure 1 and Figure 2 As shown, the beam plate 100 and the top foil 300 may have circular outer perimeters. The through hole H may be formed in the central area of ​​the beam plate 100 and the top foil 300. In addition, each of the beam plate 100 and the top foil 300 may be a single element.

[0047] On the other hand, the gasket 200 may include Figure 2 Multiple spacers are shown. For example, Figure 2Six shims 200 are shown spaced equally around the perimeter of the top surface of the beam plate 100. The plurality of shims 200 may be spaced apart from one another in the circumferential direction A of the beam plate.

[0048] refer to Figure 2 and Figure 3 Each of the beam plate 100, the shim 200, and the top foil 300 forming the air foil bearing 10 may be divided into a plurality of regions. Hereinafter, the plurality of regions of the beam plate 100, the shim 200, and the top foil 300 will be described below.

[0049] refer to Figure 2 and Figure 3 The beam plate 100 may include: an outer peripheral area 110 forming the outer periphery of the beam plate and extending in the circumferential direction A of the beam plate; a spacing area 120 provided between the through hole H and the outer peripheral area 110 and spaced apart from the outer peripheral area 110 in the radial direction R of the beam plate; and a connecting area 130 connecting the outer peripheral area 110 and the spacing area 120.

[0050] In addition, reference Figure 2 and Figure 3 The gasket 200 may include a first region 210 disposed on the peripheral region 110 of the beam plate 100, a second region 220 connected to the first region 210 and disposed on the spacing region 120 and the connection region 130 of the beam plate 100, and a third region 230 connected to the second region 220 and disposed on the spacing region 120.

[0051] Here, the third region 230 may include a plurality of protrusions 232 extending in the circumferential direction A. Here, the plurality of protrusions 232 may be spaced apart from each other in the radial direction R. For example, Figure 2 Three protrusions 232 are shown arranged in the third region 230 of each of the plurality of shims 200 in such a manner that the protrusions 232 are spaced apart from each other in the radial direction R.

[0052] refer to Figure 2 The plurality of protrusions 232 provided in the third region 230 of the gasket 200 may have different lengths. That is, the length of one protrusion in the circumferential direction A may be different from the length of another protrusion in the circumferential direction A among the plurality of protrusions 232 .

[0053] According to various exemplary embodiments of the present invention, among the plurality of protrusions 232, protrusions located farther from the center portion (outward) in the radial direction R may be longer than protrusions located inward in the radial direction R. Therefore, as the protrusions are located farther from the center portion in the radial direction R, their lengths may increase.

[0054] In an exemplary embodiment of the present invention, the protrusions located away from the central portion (outward) in the radial direction R may be proportionally longer than the protrusions located inward in the radial direction R.

[0055] In addition, reference Figure 1 The top foil 300 may include an outer peripheral portion 310 disposed on the outer peripheral region 110 of the beam plate 100, an inner portion 320 spaced inwardly from the outer peripheral portion 310 in the radial direction R and disposed on the spacing region 120 of the beam plate 100, and a first connection portion 330 connecting the outer peripheral portion 310 and the inner portion 320 and disposed on the connection region 130 of the beam plate 100. Here, the inner portion 320 may include a plurality of inner members 322 spaced apart from each other in the circumferential direction A. For example, Figure 1 Six inner members 322 are shown forming the inner portion 320. Since the outer peripheral portion 310 is provided in the first region 210 of the gasket 200 and the outer peripheral region 110 of the beam plate 100, the outer peripheral portion can face the first region 210 of the gasket 200 and the outer peripheral region 110 of the beam plate 100. Furthermore, the inner portion 320 can face the second region 220 and the third region 230 of the gasket 200 and the spacing region 120 of the beam plate 100. Furthermore, the number of inner members 322 can be the same as the number of gaskets 200.

[0056] In addition, the top foil 300 may further include a second connection portion 340 connecting the plurality of inner members 322 to one another. That is, according to various exemplary embodiments of the present invention, the outer peripheral portion 310 and the inner portion 320, which occupy most of the size of the top foil 300, may be spaced apart from one another in the radial direction R, and the inner members 322 of the inner portion 320 may be spaced apart from one another in the circumferential direction A, but the first connection portion 330 connecting the outer peripheral portion 310 to the inner portion 320 and the second connection portion 340 connecting the plurality of inner members 322 to one another may allow the top foil 300 to form a single, one-piece structure.

[0057] refer to Figure 1 、 Figure 2 and Figure 3 , the width of the connection area 130 of the beam plate 100 in the circumferential direction A may be the same as the width of a portion of the second area 220 of the gasket 200 disposed between the outer peripheral area 110 and the spacing area 120 in the circumferential direction A. Figure 1 As shown, the entirety of the connection region 130 may cover the second region 220 .

[0058] refer to Figure 1 、 Figure 2 and Figure 3, the width of the first connection portion 330 of the top foil 300 in the circumferential direction A may be smaller than the width of the connection region 130 in the circumferential direction A, and the width of the first connection portion 330 of the top foil 300 in the circumferential direction A may be smaller than the width of the portion of the second region 220 disposed between the outer peripheral region 110 and the spacing region 120 in the circumferential direction A. Therefore, as Figure 1 As shown, when the air foil bearing 10 according to various exemplary embodiments of the present invention is viewed from the top in the axial direction of the air foil bearing 10 , the first connection portion 330 may cover only the portion of the second region 220 .

[0059] compressor

[0060] Figure 4 shows a cross-sectional view of the structure of a compressor according to various exemplary embodiments of the present invention, and Figure 5 Cross-sectional views illustrating arrangements of an air foil bearing, a housing, and a rotating portion in a compressor according to various exemplary embodiments of the present invention.

[0061] like Figure 4 As shown, the compressor according to various exemplary embodiments of the present invention includes a housing 20 forming at least a portion of an exterior of the compressor, and an air foil bearing 10 attached to one surface of the housing 20 . Figure 4 The air foil bearing 10 is shown attached to the inner surface of the housing 20 .

[0062] refer to Figure 1 、 Figure 2 and Figure 3 The air foil bearing 10 may include: a beam plate 100 partially attached to a surface of a housing 20; a gasket 200 facing the housing 20, wherein the beam plate 100 is inserted into the housing 20 and has a top surface interposed between the housing and the gasket and partially covering the beam plate 100; and a top foil 300 facing the beam plate 100, wherein the gasket 200 is interposed between the beam plate and the top foil. For example, one or more through holes may be formed in the outer peripheral region 110 of the beam plate 100 (see Figure 1 ), and screws can be fastened to the through holes so that the beam plate 100 and the shell 20 can be connected to each other.

[0063] Based on the above statements, an air foil bearing and a compressor according to exemplary embodiments of the present invention will be described below.

[0064] In the air foil bearing 10 according to various exemplary embodiments of the present invention, one side of the beam plate 100 may be fixed, and the other side of the beam plate 100 may be fixed. Figure 1 The beam plate 100 is movable in the axial direction.

[0065] like Figure 5 As shown, in the compressor according to various exemplary embodiments of the present invention, the beam plate 100 may include a fixed end region E fixed to the shell 20 and a free end region F movable in the axial direction of the beam plate 100 relative to the shell 20. The fixed end region E may correspond to the outer peripheral region 110 of the beam plate 100 (see FIG. Figure 3 ), and the free end region F may correspond to the spacing region 120 of the beam plate 100 (see Figure 3 ) and connecting region 130 (see Figure 3 ).at the same time, Figure 5 The state in which the free end region F of the beam plate 100 faces the shell 20 is shown. However, the shell 20 may not face the free end region F of the beam plate 100. For example, the shell 20 may face only the fixed end region E of the beam plate 100.

[0066] refer to Figure 4 and Figure 5 The compressor according to various exemplary embodiments of the present invention may further include a rotating portion 30 facing one surface of the air foil bearing 10, the one surface of the air foil bearing being opposite to the other surface of the air foil bearing 10 facing the housing 20. Figure 5 As shown, the rotating portion 30 can face the beam plate 100 (see Figure 3 ) of the spacer area 120, wherein the gasket and the top foil are inserted between the spacer area of ​​the rotating part and the beam plate.

[0067] The rotating portion 30 may include a shaft 32 provided at a central portion thereof and an extension portion 34 extending from the shaft 32 in a radial direction of the shaft. Figure 3 ) can face the extension portion 34.

[0068] At the same time, if Figure 5 As shown, the rotating portion 30 can be aligned with the outer peripheral region 110 (see FIG. Figure 3 The extension portion 34 of the rotating portion 30 may be spaced apart from the outer peripheral region 110 of the beam plate.

[0069] In addition, if Figure 5 As shown, the free end region F of the beam plate 100 can be spaced apart from the shaft 32 in the radial direction of the rotating portion 30. Therefore, a predetermined empty space can be formed between the free end region F and the shaft 32. In addition, the free end region F of the beam plate 100 can be spaced apart from the housing 20 in the longitudinal direction of the rotating portion 30. Therefore, a predetermined empty space can be formed between the free end region F and the housing 20. In the present case, the free end region F can be directed toward the housing 20 ( Figure 5 The right direction in the figure is smoothly curved.

[0070] Figure 6A side sectional view showing the shape of an air foil bearing when a rotating portion does not rotate in a compressor according to various exemplary embodiments of the present invention; and Figure 7 A side sectional view illustrating a shape of an air foil bearing when a rotating portion rotates in a compressor according to various exemplary embodiments of the present invention.

[0071] In the following, reference Figure 6 and Figure 7 , a shape change of the air foil bearing will be described with respect to an operating state of a compressor according to an exemplary embodiment of the present invention.

[0072] When the rotating portion 30 of the compressor does not rotate, as shown in FIG. Figure 6 As shown, the entire area of ​​the beam plate 100 of the air foil bearing may not be bent and may be parallel to the rotating portion 30 .

[0073] When the rotating part 30 of the compressor rotates, air may flow between the rotating part 30 and the air foil bearing, and thus the pressure between the rotating part 30 and the air foil bearing may increase. Therefore, the air foil bearing may receive air in a direction opposite to the direction in which the air foil bearing faces the rotating part 30 ( Figure 7 force in the downward direction).

[0074] However, as described above, the outer peripheral region 110 of the beam plate 100 can be the fixed end region E attached to the housing 20, and the spacer region 120 and the connection region 130 of the beam plate 100 can be the free end region F not attached to the housing 20. Therefore, even when the air foil bearing receives a force in a direction opposite to the direction in which the air foil bearing faces the rotating portion 30, the shape of the fixed end region E may not change, but the shape of the free end region F may bend. However, due to the rigidity of the beam plate 100 itself, the free end region F may bend only to a point where the force balance between the pressure of the air flow and the elastic restoring force of the beam plate 100 is achieved. Therefore, as Figure 6 As shown, when the rotating portion 30 of the compressor stops rotating, it can return to its original state due to the elasticity of the beam plate 100.

[0075] Without forming an embossed structure having an uneven surface for reversible shape change caused by an external force, the air foil bearing according to various exemplary embodiments of the present invention can function appropriately by dividing the beam plate 100 into a fixed end region and a free end region while utilizing the rigidity of the beam plate 100 itself. Meanwhile, the compressor according to various exemplary embodiments of the present invention may be a type of compressor that supplies compressed air to a fuel tank.

[0076] As stated above, according to exemplary embodiments of the present invention, it is possible to manufacture an air foil bearing capable of achieving excellent performance even with a simpler structure than the related art, and an apparatus / device provided with such a novel air foil bearing.

[0077] For ease of explanation and accurate definition in the appended claims, the terms "up," "down," "inside," "outside," "upward," "downward," "upward," "downward," "front," "back," "inside," "outside," "inward," "outward," "interior," "exterior," "inside," "outside," "forward," and "rearward" are used to describe features of the exemplary embodiments with reference to the positions of such features as illustrated in the accompanying drawings. It will also be understood that the term "connect" or its derivatives refers to either direct or indirect connections.

[0078] The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to exclude or limit the invention to the precise forms disclosed, and it is apparent that many modifications and variations are possible in light of the above teachings. The exemplary embodiments are chosen and described to explain certain principles of the present invention and their practical application, so as to enable others skilled in the art to make and utilize various exemplary embodiments of the present invention and their alternatives or modifications. The scope of the present invention is intended to be defined by the appended claims and their equivalents.

Claims

1. An air foil bearing comprising: a beam plate provided in a predetermined portion of the air foil bearing, and a shim stacked on the beam plate and partially covering the top surface of the beam plate, wherein the first side of the beam plate is fixed, wherein the second side of the beam plate is movable relative to the first side in the axial direction of the beam plate, Wherein, the gasket includes a plurality of gaskets, wherein the plurality of spacers are arranged along the perimeter of the top surface of the beam plate, and Wherein, the plurality of spacers are spaced apart from each other on the perimeter of the beam plate. 2 . The air foil bearing of claim 1 , further comprising a top foil stacked on the shim.

3. The air foil bearing according to claim 2, in, The beam plate has a circular outer perimeter, wherein a through hole is formed in the central region of the beam plate, and Wherein, the beam plate further comprises: an outer peripheral region forming the circular outer periphery of the beam plate and extending in the circumferential direction of the beam plate; a spacing region provided between the through hole and the outer peripheral region and spaced apart from the outer peripheral region in a radial direction of the beam plate; and The connecting region connects the peripheral region and the spacer region.

4. The air foil bearing according to claim 3, wherein: The gasket comprises: A first area is provided on the outer peripheral area of ​​the beam plate; a second region connected to the first region and disposed on the spacing region and the connection region of the beam plate; and The third region is connected to the second region and is disposed on the spacer region.

5. The air foil bearing according to claim 4, wherein: The third region includes a plurality of protrusions extending in the circumferential direction of the beam plate.

6. The air foil bearing according to claim 5, wherein: The plurality of protrusions are spaced apart from each other in the radial direction of the beam plate.

7. The air foil bearing according to claim 6, wherein: Among the plurality of protrusions, protrusions located outward in the radial direction are longer than protrusions located inward in the radial direction.

8. The air foil bearing according to claim 4, wherein: The width of the connection region in the circumferential direction is the same as the width of a portion of the second region provided between the outer peripheral region and the spacing region in the circumferential direction.

9. The air foil bearing according to claim 1, wherein: The beam plate has a thickness of 0.8 mm to 3.5 mm.

10. The air foil bearing according to claim 4, wherein: The top foil comprises: an outer peripheral portion, provided on the outer peripheral region of the beam plate; an inner portion, spaced inwardly from the outer peripheral portion in the radial direction and disposed on the spaced region of the beam plate; and A first connection portion connects the outer peripheral portion and the inner portion and is provided on the connection region of the beam plate.

11. The air foil bearing according to claim 10, in, The interior includes a plurality of inner members spaced apart from each other in the circumferential direction, and Wherein, the top foil further includes a second connecting portion connecting the plurality of inner components to each other.

12. The air foil bearing according to claim 10, wherein: The width of the first connection portion in the circumferential direction is smaller than the width of the connection region in the circumferential direction.

13. A compressor comprising: case; as well as Air foil bearing, attached to the surface of the housing, wherein the air foil bearing comprises a beam plate partially attached to the surface of the housing and a gasket facing the housing, wherein the beam plate is interposed between the gasket and the housing, and the gasket partially covers a top surface of the beam plate, Wherein, the beam plate includes: a fixed end region fixed to the housing; and a free end region connected to the fixed end region and movable relative to the housing, Wherein, the gasket includes a plurality of gaskets, wherein the plurality of spacers are arranged along the perimeter of the top surface of the beam plate, and Wherein, the plurality of spacers are spaced apart from each other on the perimeter of the beam plate.

14. The compressor according to claim 13, further comprising a top foil facing the beam plate, wherein The spacer is inserted between the top foil and the beam plate.

15. The compressor according to claim 14, in, The beam plate has a circular outer perimeter, wherein a through hole is formed in the central area of ​​the beam plate, Wherein, the beam plate further comprises: an outer peripheral region forming the circular outer periphery of the beam plate and extending in the circumferential direction of the beam plate; a spacing region provided between the through hole and the outer peripheral region and spaced apart from the outer peripheral region in a radial direction of the beam plate; and a connecting region connecting the peripheral region and the spacer region, wherein the fixed end region corresponds to the peripheral region, and The free end region corresponds to the spacing region and the connection region.

16. The compressor according to claim 15, wherein The gasket comprises: A first area facing the outer peripheral area of ​​the beam plate; a second region connected to the first region and facing the spacing region and the connection region of the beam plate; and The third region is connected to the second region and faces the spaced region.

17. The compressor of claim 15, further comprising: a rotating portion facing a first surface of the air foil bearing, the first surface of the air foil bearing being opposite to a second surface of the air foil bearing facing the housing, Wherein, the rotating portion faces the spacing area.

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