Hydrodynamic Gas Bearings

Abstract

The present application is applicable to the field of gas bearing technology, and provides a hydrodynamic gas bearing, including: a bearing sleeve; a top foil, arranged in the bearing sleeve; a supporting foil group, supported between the bearing sleeve and the top foil; the supporting foil group includes a plurality of corrugated belts distributed in sequence along the axial direction, each corrugated belt is periodically extended in the circumferential direction, and the wave crests of two adjacent corrugated belts are alternately distributed in sequence along the circumferential direction; the wave crests of the corrugated belts are in contact with the top foil, and the wave troughs of the corrugated belts are in contact with the bearing sleeve. In the hydrodynamic gas bearing of this embodiment, the contact positions of the corrugated belts with the top foil and the bearing sleeve are more, more refined, and more dispersed along the circumferential direction, and the stiffness of the entire supporting foil group is more dispersed and uniform along the circumferential direction, thereby greatly reducing the phenomenon of top foil depression, and the corrugated belts have better damping performance with the top foil and the bearing sleeve, respectively, and are more likely to slide in the actual dynamic process.

Description

Technical Field

[0001] The present application belongs to the technical field of gas bearings, and more specifically, to a hydrodynamic gas bearing. Background Art

[0002] Hydrodynamic gas bearings are currently widely used in high-speed rotating machinery. Compared with hydrostatic bearings, they have the advantages of low manufacturing cost, low use and maintenance cost, so the application of hydrodynamic gas bearings is more widely popularized.

[0003] The most mature and widely used type of dynamic pressure gas bearing is the wave foil bearing. In the traditional wave foil bearing, the supporting foil is composed of a plurality of arc-shaped arches and a straight section connected between the bottoms of two adjacent arc-shaped arches, and plays the main supporting role; the top of the arc-shaped arch contacts the top foil, and the straight section contacts the bearing sleeve. Therefore, the top foil between the two adjacent arc-shaped arches forms a simply supported beam, and the middle part is suspended. When the rotor rotates, the upper surface of the top foil is subjected to the air film pressure, resulting in a concave phenomenon in the suspended part of the top foil. Summary of the invention

[0004] One of the purposes of the embodiments of the present application is to provide a hydrodynamic gas bearing, aiming to solve the technical problem in the prior art that a top foil between two adjacent arc-shaped protrusions is suspended in the air, resulting in a depression phenomenon.

[0005] In order to solve the above technical problems, the technical solution adopted in the embodiment of the present application is:

[0006] A hydrodynamic gas bearing is provided, comprising:

[0007] Bearing sleeves;

[0008] A top foil is disposed in the bearing sleeve;

[0009] A supporting foil group is supported between the bearing sleeve and the top foil; the supporting foil group includes a plurality of corrugated belts distributed in sequence along the axial direction, each of the corrugated belts is periodically extended in the circumferential direction, and the crests of two adjacent corrugated belts are alternately distributed in sequence along the circumferential direction; the crests of the corrugated belts are all in contact with the top foil, and the troughs of the corrugated belts are all in contact with the bearing sleeve.

[0010] In one embodiment, the corrugation periods of the plurality of corrugated bands are the same, and the crests of the corrugated bands and the troughs of adjacent corrugated bands are located at the same circumferential position.

[0011] In one embodiment, a plurality of the corrugated bands are spaced apart in the axial direction.

[0012] In one embodiment, the projection of the corrugated belt on the axial normal plane is arranged as a smooth curve or a broken line segment extending periodically along the circumferential direction.

[0013] In one embodiment, the axial widths of the plurality of corrugated bands gradually increase from both ends to the middle along the axial direction.

[0014] In one embodiment, the axial width of each of the corrugated bands varies periodically along the circumferential direction, and the axial width at the crest of each of the corrugated bands is greater than the axial width at the trough of each of the corrugated bands.

[0015] In one embodiment, the hydrodynamic gas bearing further comprises a plurality of elastic members spaced apart along the circumferential direction, wherein the elastic members are axially extending and one of the elastic members is embedded between the wave crests and wave troughs of the plurality of the corrugated bands at the same circumferential position.

[0016] In one embodiment, the supporting foil group further includes a straight belt and a bent belt, wherein the straight belt and the bent belt are respectively connected to the circumferential ends of the plurality of corrugated belts; the bent belt is connected to the bearing sleeve, and the straight belt and the bent belt are spaced apart and suspended.

[0017] In one embodiment, the supporting foil group includes a first supporting foil and a second supporting foil, a plurality of the corrugated bands are first corrugated bands, and the first supporting foil includes a plurality of the first corrugated bands distributed at intervals along the axial direction; a plurality of the corrugated bands are second corrugated bands, and the second supporting foil includes a plurality of the second corrugated bands distributed at intervals along the axial direction; a plurality of the first corrugated bands and a plurality of the second corrugated bands are distributed alternately and at intervals in the axial direction, and the peaks of the first corrugated bands and the peaks of the second corrugated bands adjacent thereto are distributed alternately in the circumferential direction.

[0018] In one embodiment, the plurality of corrugated belts are an integrally connected structure.

[0019] The beneficial effect of the hydrodynamic gas bearing provided by the embodiment of the present application is that: compared with the prior art, in the present application, each corrugated belt is periodically extended in the circumferential direction, and the crests of two adjacent corrugated belts are alternately distributed in the circumferential direction in sequence, so that after the crest of the corrugated belt contacts the top foil and the trough of the corrugated belt contacts the bearing sleeve, within one corrugation cycle of the corrugated belt, the top foil has two positions in contact with the corrugated belt along the circumferential direction, and the bearing sleeve also has two positions in contact with the corrugated belt along the circumferential direction. It can be understood that the contact positions of the corrugated belt with the top foil and the bearing sleeve are more, more refined and dispersed along the circumferential direction, and the stiffness of the entire supporting foil group is more dispersed and uniform along the circumferential direction, thereby greatly reducing the phenomenon of top foil concavity, and the corrugated belt has better damping performance with the top foil and the bearing sleeve, respectively, and is more likely to slide in the actual dynamic process. In addition, the corrugated belt contacts the bearing sleeve through the trough, and compared with the traditional way of contacting the bearing sleeve with the straight section, the corrugated belt has a more moderate stiffness value. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 This is an axial schematic diagram of a hydrodynamic gas bearing provided in Example 1 of the present application;

[0022] Figure 2 for Figure 1 Exploded diagram of a medium dynamic pressure gas bearing;

[0023] Figure 3 for Figure 1 A three-dimensional schematic diagram of a support foil assembly of a medium dynamic pressure gas bearing before assembly;

[0024] Figure 4 for Figure 1 A three-dimensional schematic diagram of the support foil assembly of the medium dynamic pressure gas bearing after assembly;

[0025] Figure 5 for Figure 3 A partial enlarged side view of

[0026] Figure 6 for Figure 4 Axial schematic diagram of

[0027] Figure 7 for Figure 4 Schematic diagram of the decomposition of

[0028] Figure 8 for Figure 1 A three-dimensional schematic diagram of a bearing sleeve of a medium dynamic pressure gas bearing;

[0029] Fig. 9 for Figure 1 A three-dimensional schematic diagram of the top foil of a medium dynamic pressure gas bearing;

[0030] Fig.10 A three-dimensional view of the support foil assembly of the hydrodynamic gas bearing provided in the second embodiment of the present application before assembly;

[0031] Fig.11 This is an axial schematic diagram of a hydrodynamic gas bearing provided in Embodiment 3 of the present application;

[0032] Fig.12 for Fig.11 Exploded diagram of a medium dynamic pressure gas bearing;

[0033] Fig.13A three-dimensional view of a support foil assembly of a hydrodynamic gas bearing provided in Embodiment 4 of the present application before assembly;

[0034] Fig.14 A schematic plan view of a first supporting foil of a hydrodynamic gas bearing provided in Embodiment 5 of the present application;

[0035] Fig.15 for Fig.14 A partial enlarged view of the middle A;

[0036] Fig.16 This is a schematic plan view of the first supporting foil of the hydrodynamic gas bearing provided in Example 6 of the present application.

[0037] Among them, the reference numerals in the figure are:

[0038] 10-bearing sleeve; 101-fixing groove; 20-top foil; 201-opening; 21-fixing block; 30-support foil group; 30a-first supporting foil; 30b-second supporting foil; 301a-first belt groove; 301b-second belt groove; 302-center line; 31-corrugated belt; 31a-first corrugated belt; 31b-second corrugated belt; 311-peak; 311a-first peak; 311b-second peak; 312-trough; 312a-first trough; 312b-second trough; 32-straight belt; 32a-first straight belt; 32b-second straight belt; 33-bending belt; 33a-first bending belt; 33b-second bending belt; 40-elastic member; L1-first bandwidth; L2-second bandwidth; L3-first slot width; L4-second slot width. DETAILED DESCRIPTION

[0039] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0040] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0042] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] The following is a detailed description with reference to the accompanying drawings and embodiments:

[0044] Embodiment 1

[0045] Please also read Figures 1 to 6 The hydrodynamic gas bearing provided in the embodiment of the present application includes a bearing sleeve 10, a top foil 20 and a supporting foil group 30. The bearing sleeve 10 is cylindrical, the top foil 20 is installed in the bearing sleeve 10, the rotor is installed in the top foil 20, and the supporting foil group 30 is supported between the inner circumferential wall of the bearing sleeve 10 and the outer circumferential wall of the top foil 20, and is used for supporting. Among them, the inner circumferential wall of the bearing sleeve 10 refers to the inner side wall of the bearing sleeve 10 along the circumferential direction, and the outer circumferential wall of the top foil 20 refers to the outer side wall of the top foil 20 along the circumferential direction.

[0046] The supporting foil group 30 includes a plurality of corrugated bands 31 sequentially distributed along the axial direction, and each corrugated band 31 is periodically extended in the circumferential direction; it can be understood that each corrugated band 31 is extended in a corrugated shape periodically distributed in the circumferential direction, and each corrugated band 31 has corrugations periodically distributed in the circumferential direction, and the corrugations have crests 311 and troughs 312, that is, each corrugated band 31 has crests 311 and troughs 312 alternately distributed in the circumferential direction. It should be noted here that the supporting foil group 30 is in a straight state before assembly, as shown in FIG3 , and after assembly, the supporting foil group 30 is bent by an external force, as shown in FIG3 . Figure 1 and Figure 4As shown, the supporting foil group 30 contacts between the inner peripheral wall of the bearing sleeve 10 and the outer peripheral wall of the top foil 20. Specifically, the trough 312 on each corrugated band 31 of the supporting foil group 30 contacts the inner peripheral wall of the bearing sleeve 10, and the crest 311 on each corrugated band 31 contacts the outer peripheral wall of the top foil 20. Here, in order to ensure that the crest 311 of each corrugated band 31 contacts the outer peripheral wall of the top foil 20, and the trough 312 of each corrugated band 31 contacts the inner peripheral wall of the bearing sleeve 10, the corrugation height of each corrugated band 31 in the radial direction is set to be the same, thereby improving the stability of the entire supporting foil group 30. Among them, a complete corrugation on each corrugated band 31 forms a corrugation cycle, and each corrugated band 31 includes a crest 311 and a trough 312 in a corrugation cycle. Figure 5 L indicated in the figure is a corrugation period. It should be noted that, in the present embodiment, the crests 311 and the troughs 312 on the corrugated belt 31 are relative, and in other embodiments, the crests 311 on the corrugated belt 31 can also be arranged to contact the inner peripheral wall of the bearing sleeve 10, and the troughs 312 on the corrugated belt 31 contact the outer peripheral wall of the top foil 20.

[0047] It should be noted that the wave crests 311 on any two axially adjacent corrugated bands 31 are staggered and alternately distributed in sequence in the circumferential direction, and accordingly, the wave troughs 312 on any two axially adjacent corrugated bands 31 are also staggered and alternately distributed in sequence in the circumferential direction. Here, it is temporarily assumed that the two adjacent corrugated bands 31 are respectively the first corrugated band 31a and the second corrugated band 31b, and the wave crests 311 and the wave troughs 312 on the first corrugated band 31a are respectively the first wave crests 311a and the first wave troughs 312a, and the wave crests 311 and the wave troughs 312 on the second corrugated band 31b are respectively the second wave crests 311b and the second wave troughs 312b. Figure 6 As shown, the specific distribution of the crests 311 on two adjacent corrugated belts 31 is the first crest 311a, the second crest 311b, the first crest 311a, the second crest 311b..., and so on, so that the crests 311 on two adjacent corrugated belts 31 are alternately distributed along the circumferential direction; correspondingly, the specific distribution of the troughs 312 on two adjacent corrugated belts 31 is the second trough 312b, the first trough 312a, the second trough 312b, the first trough 312a..., and so on, so that the troughs 312 on two adjacent corrugated belts 31 are alternately distributed along the circumferential direction.

[0048] In the embodiment of the present application, each corrugated belt 31 is periodically extended in the circumferential direction, and the crests 311 of two adjacent corrugated belts 31 are alternately distributed in the circumferential direction. In this way, after the supporting foil group 30 is assembled, the crests 311 of the corrugated belt 31 are in contact with the top foil 20, and the troughs 312 of the corrugated belt 31 are in contact with the bearing sleeve 10. At this time, for any two adjacent corrugated belts 31 in the axial direction, within one corrugation period of the corrugated belt 31, the top foil 20 has two positions in contact with the corrugated belt 31 in the circumferential direction, and the bearing sleeve 10 also has two positions in contact with the corrugated belt 31 in the circumferential direction, that is, within an average of each corrugation period of the corrugated belt 31 in the circumferential direction, multiple corrugated belts 31 are in contact with each other in the circumferential direction. There are two adjacent wave crests 311 in contact with the top foil 20, and the plurality of corrugated bands 31 also have two adjacent wave troughs 312 in contact with the bearing sleeve 10 along the circumferential direction; therefore, it can be understood that the provision of two adjacent corrugated bands 31 increases the wave crests 311 in contact with the top foil 20 along the circumferential direction, and also increases the wave troughs 312 in contact with the bearing sleeve 10 along the circumferential direction. Then, the entire supporting foil group 30 has more, more dispersed and more uniform contact positions with the top foil 20 and the bearing sleeve 10 along the circumferential direction, respectively. Then, the stiffness of the entire supporting foil group 30 is more dispersed and uniform along the circumferential direction, and the size of the suspended portion of the top foil 20 along the circumferential direction is reduced, thus greatly alleviating the phenomenon of the top foil 20 being sunken. Moreover, the increase and dispersion of the contact positions of the supporting foil group 30 with the top foil 20 and the bearing sleeve 10 along the circumferential direction respectively make the entire supporting foil group 30 with the top foil 20 and the bearing sleeve 10 respectively have better damping performance, and in the actual dynamic process, the supporting foil group 30 is more likely to slide. In addition, the corrugated belt 31 contacts the bearing sleeve 10 through the trough 312. Compared with the traditional way of contacting the bearing sleeve 10 with the straight section, the contact area between each trough 312 and the bearing sleeve 10 is smaller, which theoretically reduces the stiffness of the contact between the corrugated belt 31 and the bearing sleeve 10, so the supporting foil group 30 composed of multiple corrugated belts 31 has a more moderate stiffness value.

[0049] Please also read Figure 5 and Figure 6 In this embodiment, the corrugation periods of the plurality of corrugated bands 31 are the same, and the crests 311 of the corrugated bands 31 and the troughs 312 of the adjacent corrugated bands 31 are located at the same circumferential position. It can be understood that the plurality of crests 311 on one corrugated band 31 and the plurality of troughs 312 on the adjacent corrugated bands 31 are arranged one by one in the axial direction. Thus, in the view of the supporting foil group 30 in the axial direction, as shown in FIG. Figure 6As shown, any two adjacent corrugated belts 31 form a butterfly-shaped cross design, the supporting foil group 30 has a center line 302 extending in the circumferential direction, and the crests 311 on the supporting foil group 30 and the troughs 312 on the supporting foil group 30 are symmetrically arranged along the center line 302, thereby improving the cross stability of the two adjacent corrugated belts 31, thereby improving the overall stability of the supporting foil group 30. In addition, for any two adjacent corrugated belts 31, it can be ensured that there are two crests 311 and two troughs 312 in each corrugation cycle, thereby further ensuring that within one corrugation cycle of the corrugated belt 31, the top foil 20 has two positions in contact with the corrugated belt 31 along the circumferential direction, and the bearing sleeve 10 also has two positions in contact with the corrugated belt 31 along the circumferential direction, thereby achieving more dispersed and uniform contact positions between the supporting foil group 30 and the bearing sleeve 10 and the top foil 20, respectively.

[0050] In this embodiment, a plurality of corrugated belts 31 are spaced apart in the axial direction to avoid contact between adjacent corrugated belts 31 and interference during operation.

[0051] Please also read Figures 2 to 6 In the present embodiment, the corrugations on the corrugated belt 31 are arranged to be formed by continuous bending of a smooth curved surface, so that the projection line of the corrugated belt 31 on the axial normal plane (a plane perpendicular to the axial direction) is arranged to be a smooth curve periodically extending along the circumferential direction, wherein the smooth curve can be arranged to be a sinusoidal wave curve, a periodically arranged and connected tangent arc or other smooth curve, so that the corrugated belt 31 can slide more easily relative to the bearing sleeve 10 and the top foil 20 during operation.

[0052] Please also read Figure 4 and Figure 6 In the present embodiment, the supporting foil group 30 further includes a straight belt 32 and a bending belt 33, and the straight belt 32 and the bending belt 33 are respectively connected to the two circumferential ends of the plurality of corrugated belts 31; wherein the straight belt 32 is connected to one end of the plurality of corrugated belts 31 along the circumferential direction, that is, to realize the connection of one end of the plurality of corrugated belts 31 along the circumferential direction, and the bending belt 33 is connected to the other end of the plurality of corrugated belts 31 along the circumferential direction, that is, to realize the connection of the other end of the plurality of corrugated belts 31 along the circumferential direction.

[0053] In a specific embodiment, the bending belt 33 is connected to the inner peripheral wall of the bearing sleeve 10, and the straight belt 32 and the bending belt 33 are spaced apart and suspended. The spacing between the straight belt 32 and the bending belt 33 makes the supporting foil group 30 have better elastic deformation ability as a whole, and can quickly achieve load-bearing work by deformation when subjected to loading force.

[0054] See also Figure 7In this embodiment, the supporting foil group 30 is formed by combining two supporting foils. Specifically, the supporting foil group 30 includes a first supporting foil 30a and a second supporting foil 30b. The plurality of corrugated bands 31 are first corrugated bands 31a. The first supporting foil 30a includes a plurality of first corrugated bands 31a distributed at intervals along the axial direction. The plurality of corrugated bands 31 are second corrugated bands 31b. The second supporting foil 30b includes a plurality of second corrugated bands 31b distributed at intervals along the axial direction. It should be noted here that the first corrugated band 31a and the second corrugated band 31b are both periodically extended in the circumferential direction. The crests 311 and troughs 312 on the first corrugated band 31a are first crests 311a and first troughs 312a, respectively. The crests 311 and troughs 312 on the second corrugated band 31b are second crests 311b and second troughs 312b, respectively.

[0055] When the first supporting foil 30a and the second supporting foil 30b are combined and connected, the plurality of first corrugated bands 31a and the plurality of second corrugated bands 31b are alternately and spacedly distributed in the axial direction, and the crests 311 of adjacent first corrugated bands 31a and second corrugated bands 31b are staggered and alternately distributed in the circumferential direction. It can be understood that in adjacent first corrugated bands 31a and second corrugated bands 31b, the first crests 311a and second crests 311b are alternately distributed in the circumferential direction, and correspondingly, the first troughs 312a and second troughs 312b are alternately distributed in the circumferential direction.

[0056] In a specific embodiment, a plurality of first corrugated belts 31a are arranged at intervals along the axial direction, and two adjacent first corrugated belts 31a are arranged at intervals to form a first belt groove 301a; a plurality of second corrugated belts 31b are arranged at intervals along the axial direction, and two adjacent second corrugated belts 31b are arranged at intervals to form a second belt groove 301b. When the first supporting foil 30a and the second supporting foil 30b are combined and connected, the first corrugated belt 31a is embedded in the second belt groove 301b, and the second corrugated belt 31b is embedded in the first belt groove 301a, so that the plurality of first corrugated belts 31a and the plurality of second corrugated belts 31b are alternately and spacedly distributed in the axial direction. Among them, the axial width of the first belt groove 301a is greater than the axial width of the second corrugated belt 31b, and the axial width of the second belt groove 301b is greater than the axial width of the first corrugated belt 31a, so as to avoid interference between the adjacent first corrugated belt 31a and the second corrugated belt 31b during operation. Specifically, the axial width of the first belt groove 301a is 0.2mm greater than the axial width of the second corrugated belt 31b, and the axial width of the second belt groove 301b is 0.2mm greater than the axial width of the first corrugated belt 31a.

[0057] For specific embodiments, please refer to Figure 7 and Figure 8The straight belt 32 includes a first straight belt 32a and a second straight belt 32b, and the bending belt 33 includes a first bending belt 33a and a second bending belt 33b. The first straight belt 32a is connected to one end of the plurality of first supporting foils 30a along the circumferential direction, and the first bending belt 33a is connected to the other end of the plurality of first supporting foils 30a along the circumferential direction. Correspondingly, the second straight belt 32b is connected to one end of the plurality of second supporting foils 30b along the circumferential direction, and the second bending belt 33b is connected to the other end of the second supporting foil 30b along the circumferential direction. After the first supporting foil 30a and the second supporting foil 30b are connected, the first straight belt 32a is connected to the second straight belt 32b, and the first bending belt 33a is connected to the second bending belt 33b. A fixing groove 101 is formed on the inner peripheral wall of the bearing sleeve 10, and the first bending belt 33a and the second bending belt 33b are fixed in the fixing groove 101. It can be understood that the first bending band 33a and the second bending band 33b are both bent radially toward the bearing sleeve 10. During installation, after the first supporting foil 30a and the second supporting foil 30b form a combined connection, the first bending band 33a and the second bending band 33b can be directly inserted into the fixing groove 101; in other embodiments of the present application, the first bending band 33a and the second bending band 33b can be fixed to the bearing sleeve 10 by welding, riveting or screw locking, which is not the only limitation here.

[0058] Correspondingly, the first straight band 32a and the first bent band 33a are respectively connected to the first corrugated band 31a as a whole, and of course, they can also be fixed by welding, riveting or screw locking; the second straight band 32b and the second bent band 33b are respectively connected to the second corrugated band 31b as a whole, and of course, they can also be fixed by welding, riveting or screw locking, which is not the only limitation here.

[0059] In another embodiment, the plurality of corrugated strips 31 are integrally connected structures, that is, the supporting foil is formed by one supporting foil. Compared with the structure formed by combining two supporting foils, the structure of the supporting foil group 30 is simpler.

[0060] In the specific embodiment, please see Fig. 9The top foil 20 is formed with an opening 201 along the circumferential direction. The top foil 20 is interrupted by the opening 201 to form two ends, one of which is fixed on the bearing sleeve 10, and the other end is suspended. The opening 201 is provided to make the elastic deformation ability of the top foil 20 better, and when subjected to a loading force, it can quickly bear the load through deformation, and at the same time, it can transmit the loading force to the support foil group 30 through deformation, and bear and consume the loading force through the elastic deformation of the support foil group 30. By fixing one end of the top foil 20 on the bearing sleeve 10, the top foil 20 is prevented from circumferentially moving in the bearing sleeve 10 due to the force, and the other end of the top foil 20 is suspended, the elastic deformation ability of the top foil 20 can be improved.

[0061] A fixing block 21 bent toward the bearing sleeve 10 is provided at one end of the top foil 20. The fixing block 21 and the fixing groove 101 both extend along the axial direction of the bearing sleeve 10. When installing, the fixing block 21 is inserted into the fixing groove 101 along the axial direction to be fixed. It can be understood that in other embodiments of the present application, one end of the top foil 20 can also be directly fixed to the bearing sleeve 10 by welding, riveting, and screw locking, which is not limited here.

[0062] Embodiment 2

[0063] See also Fig.10 The difference between this embodiment and the first embodiment is that the corrugations on the corrugated belt 31 are arranged to be formed by bending a plurality of planes, so that the projection line of the corrugated belt 31 on the axial normal plane (a plane perpendicular to the axial direction) is arranged to be a broken line segment extending periodically along the circumferential direction.

[0064] The rest of this embodiment is the same as the first embodiment. The features not explained in this embodiment are all based on the explanations in the first embodiment and will not be described in detail here.

[0065] Embodiment 3

[0066] Please also read Fig.11 and Fig.12, the difference between this embodiment and the first embodiment is that: the hydrodynamic gas bearing further includes a plurality of elastic members 40 spaced apart along the circumferential direction, each elastic member 40 is extended along the axial direction, and an elastic member 40 is embedded between the wave crests 311 and the wave troughs 312 of the plurality of corrugated bands 31 at the same circumferential position. The elastic member 40 can be set as a thin-walled circular tube or other elastic attachment. The embedded design of the elastic member 40 increases the overall support stiffness of the supporting foil group 30, which can meet people's demand for greater stiffness, and further slows down the axial movement between adjacent corrugated bands 31. It can be understood that an elastic member 40 is embedded between the plurality of first wave crests 311a and the second wave troughs 312b at the same circumferential position, and the elastic member 40 is connected to the first wave crest 311a or the second wave trough 312b; and an elastic member 40 is also embedded between the plurality of second wave crests 311b and the first wave trough 312a at the same circumferential position, and the elastic member 40 is connected to the second wave crest 311b or the first wave trough 312a. Generally, the elastic member 40 is not fixedly connected to the wave crest 311 and the wave trough 312 of the wave crest 311 at the same time, so as to avoid the damping performance of the entire supporting foil assembly 30 .

[0067] The rest of this embodiment is the same as the first embodiment. The features not explained in this embodiment are all based on the explanations in the first embodiment and will not be described in detail here.

[0068] Embodiment 4

[0069] See also Fig.13 The difference between this embodiment and the first embodiment is that the distribution of the plurality of corrugated bands 31 is set such that the axial width of the plurality of corrugated bands 31 gradually increases from the two ends to the middle along the axial direction, that is, the axial width of the corrugated bands 31 at the two ends of the axial direction is the smallest, and the axial width of the corrugated bands 31 at the middle portion of the axial direction is the largest. Generally, during operation, the pressure on the top foil 20 gradually increases from the two ends to the middle along the axial direction, so that the supporting foil group 30 and the middle portion of the top foil 20 along the axial direction are more likely to deform. In this embodiment, by designing the axial width of the plurality of corrugated bands 31 to gradually increase from the two ends to the middle along the axial direction, the rigidity of the entire supporting foil group 30 gradually increases from the two ends to the middle along the axial direction, so that the overall deformation of the supporting foil group 30 is slowed down, thereby slowing down the sinking phenomenon of the top foil 20.

[0070] The rest of this embodiment is the same as the first embodiment. The features not explained in this embodiment are all based on the explanations in the first embodiment and will not be described in detail here.

[0071] Embodiment 5

[0072] Please also read Fig.14 and Fig.15The difference between this embodiment and the first embodiment is that the axial width of each corrugated band 31 varies periodically along the circumferential direction, and the axial width at the crest 311 of each corrugated band 31 is greater than the axial width at the trough 312 of each corrugated band 31. In this way, the contact area between the crest 311 of each corrugated band 31 and the top foil 20 is greater than the contact area between the trough 312 of each corrugated band 31 and the bearing sleeve 10. For the entire supporting foil group 30, the axial length of the contact line between the entire crest 311 of the supporting foil group 30 and the top foil 20 along the axial direction increases. On the one hand, the stiffness distribution of the supporting foil group 30 along the axial direction is more uniform, that is, it can provide a more uniform supporting effect for the top foil 20. On the other hand, the size of the suspended part of the top foil 20 formed between two adjacent crests 311 along the axial direction is reduced, that is, the size of the suspended part of the top foil 20 along the circumferential direction is reduced as a whole. Therefore, the collapse effect of the top foil 20 is greatly slowed down, and the use of the top foil 20 is guaranteed.

[0073] In a specific embodiment, the axial width of the corrugated belt 31 is periodically extended in the circumferential direction. It can be understood that the contours of each corrugated belt 31 along both sides of the axial direction are periodically extended, so that the axial width of each corrugated belt 31 is periodically distributed, that is, the axial width gradually increases, gradually decreases, then gradually increases, then gradually decreases..., and so on. In this embodiment, the axial contour of the corrugated belt 31 is a smooth curve, which can be set as a sine wave curve, a periodically arranged and connected tangent arc, or other smooth curves.

[0074] In a specific embodiment, to ensure the stable supporting capacity of each corrugated belt 31, each corrugated belt 31 is arranged symmetrically along the axial perpendicular midline. In this way, the contours of each corrugated belt 31 on both sides of the axial direction are symmetrical along the axial perpendicular midline of the corrugated belt 31.

[0075] In a specific embodiment, the period of the axial width distribution of the corrugated belt 31 is the same as the corrugation period of the corrugated belt 31, and since the crest 311 of the corrugated belt 31 contacts the top foil 20, the trough 312 of the corrugated belt 31 contacts the bearing sleeve 10, and the axial width of the corrugated belt 31 at the crest 311 is greater than the axial width of the corrugated belt 31 at the trough 312, it can be understood that the axial width of each corrugated belt 31 at its crest 311 is the largest, and the axial width of each corrugated belt 31 at its trough 312 is the smallest. Therefore, the axial length of the contact line between each corrugated belt 31 and the top foil 20 is maximized as much as possible, and the axial length of the contact line between each corrugated belt 31 and the bearing sleeve 10 is minimized, so that the rigidity of the support foil group 30 formed by the combination of multiple corrugated belts 31 can be evenly distributed in the axial direction to the greatest extent, thereby maximally slowing down the collapse of the top foil 20. Among them, as Fig.14 and Fig.15As shown, the axial width of the first corrugated band 31a at the first crest 311a is the first bandwidth L1, which is the maximum axial width of the first corrugated band 31a, and the axial width of the first corrugated band 31a at the first trough 312a is the second bandwidth L2, which is the minimum axial width of the second corrugated band 31b. Correspondingly, for the first band groove 301a formed by two adjacent first corrugated bands 31a, the axial width of the first band groove 301a at the first wave valley 312a is the first groove width L3, which is the maximum groove width, and the axial width of the first band groove 301a at the first wave peak 311a is the second groove width L4, which is the minimum groove width; and, the first band groove 301a formed by two adjacent first corrugated bands 31a is used to embed the second corrugated band 31b, the second wave valley 312b of the second corrugated band 31b is embedded in the first wave peak 311a of the first band groove 301a, and the second wave peak 311b of the second corrugated band 31b is embedded in the first wave valley 312a of the first band groove 301a, so as to avoid mutual interference between the first corrugated band 31a and the second corrugated band 31b.

[0076] The rest of this embodiment is the same as the first embodiment. The features not explained in this embodiment are all based on the explanations in the first embodiment and will not be described in detail here.

[0077] Embodiment 6

[0078] See also Fig.16 The difference between this embodiment and the fifth embodiment is that the contours of the two axial sides of the corrugated belt 31 are set as broken line segments.

[0079] The rest of this embodiment is the same as that of the fifth embodiment. The features not explained in this embodiment are all based on the explanations in the fifth embodiment and will not be described in detail here.

[0080] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A hydrodynamic gas bearing, characterized in that: include: Bearing sleeves; A top foil is disposed in the bearing sleeve; A supporting foil group is supported between the bearing sleeve and the top foil; the supporting foil group comprises a plurality of corrugated belts sequentially distributed along the axial direction, each of the corrugated belts is periodically extended in the circumferential direction, and the crests of two adjacent corrugated belts are alternately distributed in the circumferential direction; the crests of the corrugated belts are in contact with the top foil, and the troughs of the corrugated belts are in contact with the bearing sleeve; The hydrodynamic gas bearing also includes a plurality of elastic members spaced apart along the circumferential direction. The elastic members are axially extending and one elastic member is embedded between the crests and troughs of the plurality of corrugated belts at the same circumferential position. The elastic member is a thin-walled circular tube.

2. The hydrodynamic gas bearing according to claim 1, wherein: The corrugation periods of the plurality of corrugated bands are the same, and the crests of the corrugated bands and the troughs of the adjacent corrugated bands are located at the same circumferential position.

3. The dynamic pressure gas bearing according to claim 1, characterized in that: A plurality of the corrugated bands are spaced apart and distributed along the axial direction.

4. The dynamic pressure gas bearing according to claim 1, characterized in that: The projection of the corrugated belt on the axial normal plane is arranged as a smooth curve or a broken line segment that is periodically extended along the circumferential direction.

5. The hydrodynamic gas bearing according to claim 1, wherein: The axial widths of the plurality of corrugated bands gradually increase from both ends to the middle along the axial direction.

6. The hydrodynamic gas bearing according to claim 1, wherein: The axial width of each of the corrugated belts varies periodically along the circumferential direction, and the axial width at the crest of each of the corrugated belts is greater than the axial width at the trough of each of the corrugated belts.

7. The hydrodynamic gas bearing according to any one of claims 1 to 6, characterized in that: The supporting foil group also includes a straight belt and a bending belt, which are respectively connected to the circumferential ends of the plurality of corrugated belts; the bending belt is connected to the bearing sleeve, and the straight belt and the bending belt are distributed at intervals and suspended.

8. The hydrodynamic gas bearing according to any one of claims 1 to 6, characterized in that: The supporting foil group includes a first supporting foil and a second supporting foil, the plurality of corrugated bands are first corrugated bands, the first supporting foil includes a plurality of the first corrugated bands distributed at intervals along the axial direction; the plurality of the corrugated bands are second corrugated bands, the second supporting foil includes a plurality of the second corrugated bands distributed at intervals along the axial direction; the plurality of the first corrugated bands and the plurality of the second corrugated bands are distributed alternately and at intervals in the axial direction, and the peaks of the first corrugated bands and the peaks of the second corrugated bands adjacent thereto are distributed alternately in the circumferential direction.

9. The hydrodynamic gas bearing according to any one of claims 1 to 6, characterized in that: The plurality of corrugated belts are an integrally connected structure.

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