Dynamic and static pressure mixed gas bearing, rotating mechanism and turbine device

Abstract

The utility model relates to a dynamic and static pressure mixed gas bearing, a rotating mechanism and a turbine device.The dynamic and static pressure mixed gas bearing comprises a shell, a foil assembly and an air hole, the shell is provided with a first area, a second area and a shaft hole, and the first area and the second area are independent of each other and extend in the circumferential direction of the shaft hole; the foil assembly is arranged in the first area; the air hole is arranged in the second area. According to the dynamic and static pressure mixed gas bearing, the foil assembly and the gas hole are arranged in the first area and the second area which are independent of each other respectively, a gas supply pipe and a gas supply hole do not need to be arranged in the foil assembly, and elastic deformation generated in the working process of the foil assembly does not affect normal gas transmission of the gas hole or gas film formation of the gas bearing. Rigidity and damping are provided through the foil assembly, and the static pressure gas film is provided through the gas hole, so that the dynamic and static pressure mixed gas bearing has high stability of a dynamic pressure gas bearing and high bearing capacity of a static pressure gas bearing, and the application field of the gas bearing can be expanded.

Description

Technical Field

[0001] The present application relates to the field of bearings, and in particular to a dynamic and static pressure mixed gas bearing, a rotating mechanism and a turbine device. Background Art

[0002] With the development of bearing technology, traditional rolling bearings and sliding bearings are gradually being replaced by gas bearings (i.e., air bearings) in devices with high-speed rotating shafts because of the advantages of gas bearings such as low friction and a wide applicable temperature range.

[0003] Common gas bearings are divided into dynamic pressure gas bearings and static pressure gas bearings. Foil dynamic pressure gas bearings use the pressure difference formed by high-speed rotating gas on the foil surface to achieve load-bearing. Due to the relatively low viscosity of the gas, dynamic pressure gas bearings usually have a relatively low load-bearing capacity and are only suitable for high-speed and light-load occasions.

[0004] The static pressure gas bearing uses external high-pressure gas to form a high-pressure gas film (i.e., static pressure gas film) on the bearing surface, and supports it through the high-pressure gas film to achieve load-bearing. The static pressure gas bearing has a higher load-bearing capacity than the dynamic pressure gas bearing. However, since the static pressure gas bearing requires an external high-pressure gas source, its reliability is affected by the stability and reliability of the external high-pressure gas source. At the same time, the static pressure bearing has low damping and poor high-speed stability.

[0005] In order to improve the bearing capacity and reliability of gas bearings, the dynamic and static pressure mixed gas bearings in the prior art are provided with air supply holes on the foil, and then the air supply pipe is connected to the air supply hole on the foil through the bearing housing, and high-pressure gas is input through the air supply pipe, so as to form a high-pressure gas film on the surface of the foil. However, since the foil will undergo elastic deformation during operation, it is easy to affect the air supply holes and air supply pipes in the foil. When the air supply pipe is damaged by the foil extrusion, the high-pressure gas film on the surface of the foil cannot be formed, making the reliability of the dynamic and static pressure mixed gas bearings in the prior art low. Utility Model Content

[0006] The present application provides a dynamic and static pressure mixed gas bearing, a rotating mechanism and a turbine device to solve the technical problem of low reliability of dynamic and static pressure mixed gas bearings in the prior art.

[0007] In a first aspect, the present application provides a dynamic and static pressure mixed gas bearing, comprising:

[0008] A shell body, wherein the shell body has a first area, a second area and an axial hole, the first area and the second area are independent of each other, and both the first area and the second area are extended along the circumference of the axial hole;

[0009] A foil assembly, the foil assembly is disposed in the first area;

[0010] The pores are arranged in the second zone.

[0011] Optionally, the second area is arranged to protrude from the first area, and the foil assembly is arranged to protrude from the air outlet end surface of the air hole.

[0012] Optionally, the second area is connected to the first area in a stepped manner.

[0013] Optionally, the foil assembly includes a bump foil and a top foil, and the top foil is arranged on a side of the bump foil away from the housing;

[0014] The top foil comprises a first connecting portion, a wedge-shaped portion and a matching portion, wherein the first connecting portion is connected to the first region, the wedge-shaped portion is connected between the first connecting portion and the matching portion, and the matching portion is arranged in contact with the bump foil.

[0015] Optionally, the air hole comprises an air inlet section and an air outlet section, and the cross-sectional area of ​​the air inlet section is greater than the cross-sectional area of ​​the air outlet section.

[0016] Optionally, the first zone and the second zone are both in a fan ring shape, and there are multiple first zones and multiple second zones, and the multiple first zones and second zones are alternately arranged on the end surface of the shell.

[0017] Optionally, the foil assembly includes a corrugated foil in a fan-shaped ring shape, and the corrugated foil is provided with a plurality of partition grooves arranged along the radial direction of the shell, and the partition grooves are arc grooves extending along the circumference of the shell.

[0018] Optionally, a plurality of air holes are provided in each second zone, and the plurality of air holes are sequentially arranged along the radial direction of the shell.

[0019] Optionally, the first area includes a first mounting area and a second mounting area connected in a stepped manner, the first mounting area is arranged to protrude from the second mounting area, and the first mounting area is connected between the second area and the second mounting area.

[0020] Optionally, a plurality of fixing parts are provided on the outer periphery of the shell.

[0021] Optionally, the shell is a cylindrical structure, the first zone and the second zone are arranged in sequence along the axial direction of the shell, and the first zone and the second zone are both arranged in an annular shape on the inner circumference of the shaft hole.

[0022] Optionally, a plurality of air holes are provided in the second zone, and the plurality of air holes are evenly arranged along the circumference of the second zone, and the axes of the air holes extend along the radial direction of the shell.

[0023] In a second aspect, the present application provides a rotating mechanism, including the dynamic and static pressure mixed gas bearing provided in the first aspect of the present application, and also including a rotating shaft, the rotating shaft and the shaft hole are rotatably connected, and the foil assembly and the air hole are both arranged toward the rotating shaft.

[0024] In a third aspect, the present application provides a turbine device, including the dynamic and static pressure mixed gas bearing provided in the first aspect of the present application;

[0025] Alternatively, the rotating mechanism includes the rotating mechanism provided in the second aspect of the present application, and blades are provided on the rotating shaft.

[0026] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0027] The dynamic and static pressure mixed gas bearing provided in the embodiment of the present application sets the foil assembly and the air hole in the first and second areas which are independent of each other, respectively. Compared with the prior art, there is no need to set the air supply pipe and the air supply hole inside the foil assembly. During the operation of the dynamic and static pressure mixed gas bearing of the present application, the elastic deformation of the foil assembly will not affect the normal gas supply of the air hole, and will not affect the formation of the air film of the dynamic and static pressure mixed gas bearing, which can improve the reliability of the dynamic and static pressure mixed gas bearing. At the same time, the present application provides stiffness and damping for the dynamic and static pressure mixed gas bearing through the foil assembly, and provides a static pressure air film for the dynamic and static pressure mixed gas bearing through the air hole, which can improve the stability and load-bearing capacity of the dynamic and static pressure mixed gas bearing. The dynamic and static pressure mixed gas bearing of the present application has both the high stability of the dynamic pressure gas bearing and the high load-bearing capacity of the static pressure gas bearing, which can greatly expand the application field of gas bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0030] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0031] Figure 1 Schematic diagram of the structure of the dynamic and static pressure mixed gas bearing provided in the embodiment of the present application Figure 1 ;

[0032] Figure 2 A front view of a dynamic and static pressure mixed gas bearing provided in an embodiment of the present application Figure 1 ;

[0033] Figure 3 Schematic diagram of the arrangement of the corrugated foil on the housing provided in the embodiment of the present application Figure 1 ;

[0034] Figure 4 The embodiment of the present application provides Figure 2 Cross-section of the middle AA;

[0035] Figure 5 Schematic diagram of the structure of the dynamic and static pressure mixed gas bearing provided in the embodiment of the present application Figure 2 ;

[0036] Figure 6 A front view of a dynamic and static pressure mixed gas bearing provided in an embodiment of the present application Figure 2 ;

[0037] Figure 7 Schematic diagram of the arrangement of the corrugated foil on the housing provided in the embodiment of the present application Figure 2 ;

[0038] Figure 8 The embodiment of the present application provides Figure 6 Cross-section of the middle BB;

[0039] Fig. 9 Schematic diagram of the structure of the dynamic and static pressure mixed gas bearing provided in the embodiment of the present application Figure 3 ;

[0040] Fig.10 Schematic diagram of the structure of the dynamic and static pressure mixed gas bearing provided in the embodiment of the present application Figure 4 ;

[0041] Fig.11 Provided in the embodiments of this application Fig. 9 A cross-sectional view of a dynamic and static pressure mixed gas bearing;

[0042] Fig.12 Provided in the embodiments of this application Fig. 9 Left side view of the dynamic and static pressure mixed gas bearing.

[0043] Description of reference numerals:

[0044] 1. Shell; 11. First area; 111. First installation area; 112. Second installation area; 12. Second area; 13. Shaft hole; 14. Fixing part;

[0045] 2. Foil assembly; 21. Corrugated foil; 211. Second connection portion; 212. Corrugated portion; 213. Partitioning groove; 22. Top foil; 221. First connection portion; 222. Wedge-shaped portion; 223. Matching portion;

[0046] 3. Air hole; 31. Air inlet section; 32. Air outlet section. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0048] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the application can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0049] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0050] In order to solve the technical problem of low reliability of dynamic and static pressure mixed gas bearings in the prior art, the present application provides a dynamic and static pressure mixed gas bearing, a rotating mechanism and a turbine device, which can realize the zoned setting of the foil assembly 2 and the pore 3 on the bearing housing 1, avoid mutual interference and mutual influence between the foil assembly 2 and the pore 3, and can improve the load-bearing capacity and reliability of the gas bearing through the coordinated cooperation of the foil assembly 2 in the first zone 11 and the pore 3 in the second zone 12.

[0051] See also Figures 1 to 12In a first aspect, an embodiment of the present application provides a dynamic and static pressure mixed gas bearing, comprising a housing 1, a foil assembly 2 and an air hole 3, wherein the housing 1 has a first area 11, a second area 12 and an axial hole 13, wherein the first area 11 and the second area 12 are independent of each other, and both the first area 11 and the second area 12 are arranged to extend along the circumference of the axial hole 13, such as Figure 2 , Figure 6 and Fig.12 As shown, the foil assembly 2 and the air holes 3 are arranged along the circumference of the shaft hole 13 to achieve circumferential support for the rotating shaft in the shaft hole 13.

[0052] The foil assembly 2 is arranged in the first zone 11, such as Figure 1 , Figure 2 , Figure 5 , Figure 6 and Fig.11 As shown. When the dynamic and static pressure mixed gas bearing is matched with the rotating shaft, since the foil assembly 2 is an elastic assembly, it can produce elastic deformation during the operation process, provide rigidity and damping for the dynamic and static pressure mixed gas bearing, and ensure the stability of the dynamic and static pressure mixed gas bearing during the operation process. When the rotating shaft in the shaft hole 13 rotates at a high speed, the airflow on the supporting surface of the foil assembly 2 (i.e., the surface for contacting and matching with the rotating shaft) rotates at a high speed to form a dynamic pressure air film, which can reduce the friction between the rotating shaft and the foil assembly 2, thereby reducing the friction resistance between the dynamic and static pressure mixed gas bearing and the rotating shaft.

[0053] The air hole 3 is arranged in the second area 12, and can be used to provide high-pressure gas to the support side of the dynamic and static pressure mixed gas bearing (i.e., the side used for contacting and matching with the rotating shaft), thereby forming a static pressure gas film between the matching surface of the dynamic and static pressure mixed gas bearing and the rotating shaft. Since the load-bearing capacity of the static pressure gas film is greater than that of the dynamic pressure gas film, the load-bearing capacity of the dynamic and static pressure mixed gas bearing can be further improved.

[0054] It should be noted that, since the foil assembly 2 and the air hole 3 are respectively arranged in the first zone 11 and the second zone 12 which are independent of each other, compared with the prior art, there is no need to set an air supply pipe and an air supply hole inside the foil assembly 2, so that the dynamic pressure part structure and the static pressure part structure do not affect each other, thereby improving the reliability of the dynamic and static pressure mixing effect. During the operation of the dynamic and static pressure mixed gas bearing of the present application, the elastic deformation of the foil assembly 2 will not affect the normal gas supply of the air hole 3, will not affect the formation of the air film of the dynamic and static pressure mixed gas bearing, and can improve the reliability of the dynamic and static pressure mixed gas bearing. At the same time, the present application provides stiffness and damping for the dynamic and static pressure mixed gas bearing through the foil assembly 2, and provides a static pressure air film for the dynamic and static pressure mixed gas bearing through the air hole 3, which can improve the stability and load-bearing capacity of the dynamic and static pressure mixed gas bearing.

[0055] It should be noted that the dynamic and static pressure mixed gas bearing of the present application can be a thrust bearing, such as Figures 1 to 8As shown, at this time, the foil assembly 2 and the air hole 3 are arranged at one end of the housing 1, and the dynamic pressure air film and the static pressure air film are planar air films, which can provide axial support for the rotating shaft. The dynamic and static pressure mixed gas bearing in this application can also be a radial bearing, such as Figures 9 to 12 As shown, at this time, the foil assembly 2 and the air hole 3 are arranged on the inner circumference of the shaft hole 13, and the dynamic pressure air film and the static pressure air film are cylindrical air films, which can provide radial support for the rotating shaft.

[0056] In some embodiments of this application, please refer to Figure 2 , Figure 4 , Figure 6 , Figure 8 , Fig.11 and Fig.12 , the second area 12 is arranged to protrude from the first area 11, and the foil assembly 2 is arranged to protrude from the outlet end face of the pore 3; this is because the thickness of the static pressure film formed on the outlet end face of the pore 3 is less than the thickness of the foil assembly 2. If the first area 11 is arranged flush with the second area 12, or the first area 11 is arranged to protrude from the second area 12, the distance of the support surface of the foil assembly 2 protruding from the static pressure film will be too large, which will cause the static pressure film to be unable to contact the surface of the rotating shaft, resulting in the failure of the support function of the static pressure film. Therefore, when the second area 12 is arranged to protrude from the first area 11, the height difference H between the support surface of the foil assembly 2 and the outlet end face of the pore 3 in the support direction of the dynamic and static pressure mixed gas bearing can be maintained within a reasonable range. In the initial state, the foil assembly 2 is arranged to protrude from the outlet end face of the pore 3, so that the foil assembly 2 can still ensure that the fluid dynamic pressure effect is always in a working state after undergoing compression deformation.

[0057] In some preferred embodiments of the present application, in the initial state, the height difference H between the support surface of the foil assembly 2 and the outlet end surface of the air hole 3 in the support direction of the dynamic and static pressure mixed gas bearing is in the range of 0<H≤0.2mm. This is because the thickness of the static pressure air film is usually below 0.1mm. If the support surface of the foil assembly 2 exceeds the end surface of the air hole 3 by more than 0.2mm, when the compression deformation of the foil assembly 2 is small, it will still cause the support surface of the foil assembly 2 to exceed the surface of the static pressure air film, making it impossible for the static pressure air film to contact the surface of the rotating shaft, resulting in the failure of the supporting function of the static pressure air film.

[0058] It should be noted that when the dynamic and static pressure mixed gas bearing is a thrust bearing, H is the height difference between the support surface of the foil assembly 2 and the gas outlet end surface of the air hole 3 in the axial direction of the housing 1, such as Figure 4 and Figure 8 When the dynamic and static pressure mixed gas bearing is a radial bearing, H is the difference between the support surface of the foil assembly 2 and the outlet end surface of the air hole 3 in the radial direction of the housing 1, as shown in FIG. Fig.11 shown.

[0059] In some embodiments of the present application, the air hole 3 is arranged through the second area 12 along the supporting direction of the dynamic and static pressure mixed gas bearing. At this time, the surface of the second area 12 facing the shaft mating surface is the outlet end surface of the air hole 3. When the dynamic and static pressure mixed gas bearing is a thrust bearing, the outlet end surface is a plane; when the dynamic and static pressure mixed gas bearing is a radial bearing, the outlet end surface is a cylindrical surface, such as Figure 2 , Figure 4 , Figure 6 , Figure 8 , Fig. 9 and Fig.11 shown.

[0060] In some embodiments of this application, please refer to Figure 4 , Figure 8 and Fig.11 The second area 12 is connected to the first area 11 in a stepped manner, so that the mounting surface of the foil assembly 2 in the first area 11 can be recessed in the gas outlet end surface of the pore 3 in the second area 12, so that the height difference between the supporting surface of the foil assembly 2 and the gas outlet end surface of the pore 3 is maintained within a reasonable range. When the foil assembly 2 is deformed, the dynamic-static pressure mixed gas bearing can still be in an effective working state of dynamic-static pressure mixing.

[0061] In some embodiments of this application, please refer to Figure 3 , Figure 4 , Figure 7 , Figure 8 , Fig. 9 , Fig.10 and Fig.12 The foil assembly 2 includes a bump foil 21 and a top foil 22. Both the bump foil 21 and the top foil 22 are elastic foils that can be deformed during operation to provide stiffness and damping for the dynamic and static pressure mixed gas bearing. The top foil 22 is arranged on the side of the bump foil 21 away from the housing 1. The surface of the top foil 22 away from the bump foil 21 is configured as a supporting surface of the foil assembly 2. A dynamic pressure gas film is formed on the surface of the top foil 22 away from the bump foil 21, which can reduce the friction resistance between the top foil 22 and the mating surface of the rotating shaft.

[0062] The top foil 22 has a first connecting portion 221, a wedge-shaped portion 222 and a matching portion 223. The first connecting portion 221 is connected to the first zone 11 to realize the fixed setting of one end of the top foil 22; the wedge-shaped portion 222 is connected between the first connecting portion 221 and the matching portion 223, and the matching portion 223 is arranged in contact with the bump foil 21 to facilitate the bump foil 21 to undergo synchronous deformation, thereby providing stiffness and damping for the dynamic and static pressure mixed gas bearing. When the airflow flows on the wedge-shaped surface of the wedge-shaped portion 222, a pressure difference can be generated, thereby realizing the supporting effect on the rotating shaft. When the high-speed fluid flows through the surface of the top foil 22 away from the bump foil 21 (i.e., the supporting surface of the foil assembly 2), a dynamic pressure gas film will be formed on the surface of the top foil 22 to realize the support of the rotating shaft.

[0063] In some embodiments of the present application, the corrugated foil 21 has a second connecting portion 211 and a corrugated portion 212 connected thereto, wherein the second connecting portion 211 is used to connect to the first zone 11 to fix the corrugated foil 21, and the corrugated portion 212 is arranged in relative contact with the mating portion 223 of the top foil 22, and the deformation of the corrugated portion 212 can realize the telescopic deformation of the foil assembly 2 in the supporting direction.

[0064] In the above embodiment, if the air flow pressure output by the air hole 3 is too small, a static pressure air film with high bearing capacity cannot be formed on the air outlet end surface of the air hole 3. In order to solve the above problem, in some embodiments of the present application, please refer to Figure 2 , Figure 4 , Figure 6 , Figure 8 , Fig. 9 , Fig.10 and Fig.11 The pore 3 includes an air inlet section 31 and an air outlet section 32. The cross-sectional area of ​​the air inlet section 31 is larger than that of the air outlet section 32. The air inlet section 31 and the air outlet section 32 are connected to form a throttling micropore (i.e., the pore 3). When the cross-sectional area of ​​the air outlet section 32 is reduced relative to the cross-sectional area of ​​the air inlet section 31, the air flow pressure of the air outlet section 32 can be increased, thereby increasing the air flow pressure output by the pore 3, which is conducive to forming a static pressure air film with high bearing capacity on the air outlet end face of the pore 3.

[0065] In some preferred embodiments of the present application, the diameter of the pores 3 of the air outlet section 32 is 0.1-0.3mm. This is because, when the diameter of the pores 3 of the air outlet section 32 is less than 0.1mm, the gas pressure at the air outlet end face will drop too fast after the gas is transported to the air outlet end face through the pores 3, which will lead to a reduction in the bearing capacity. When the diameter of the pores 3 of the air outlet section 32 is greater than 0.3mm, the static pressure air film formed after the gas is transported to the air outlet end face through the pores 3 is insufficient in rigidity, and the air hammer effect is more likely to occur, affecting the operating reliability of the dynamic and static pressure mixed gas bearing. When the diameter of the pores 3 of the air outlet section 32 is 0.1-0.3mm, the external high-pressure gas flows from the pores 3 to the supporting surface of the dynamic and static pressure mixed gas bearing, and a static pressure air film with a higher bearing capacity will be generated. The static pressure air film has a greater bearing capacity than the dynamic pressure air film on the surface of the top foil 22, so it can effectively improve the overall bearing capacity of the dynamic and static pressure mixed gas bearing.

[0066] In some embodiments of the present application, when the dynamic and static pressure mixed gas bearing is a thrust bearing, the rotating shaft has a shoulder end face that matches the thrust bearing (that is, the rotating shaft matching surface is the shoulder end face), and the foil assembly 2 and the air hole 3 are both arranged toward the shoulder end face of the rotating shaft to provide axial support for the rotating shaft. In order to achieve uniform support for the shoulder end face of the rotating shaft, the number of the first zone 11 and the second zone 12 are both multiple, and the first zone 11 and the second zone 12 are both fan-shaped, and the fan ring extends along the circumference of the shaft hole 13. Multiple first zones 11 and second zones 12 are alternately arranged on the end face of the housing 1, such as Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the foil assembly 2 and the air holes 3 can be evenly and alternately arranged along the circumference of the end surface of the shell 1, thereby forming a uniform dynamic pressure air film and a static pressure air film at one end of the shell 1, thereby achieving uniform support for the shoulder end surface of the rotating shaft.

[0067] In some embodiments of this application, please refer to Figure 1 , Figure 3 , Figure 5 and Figure 7 The bump foil 21 and the top foil 22 are also arranged in the first area 11 in a fan ring shape, and can be embedded with the first area 11, so as to facilitate the positioning and installation of the foil assembly 2.

[0068] In some embodiments of the present application, the corrugated foil 21 further has a plurality of partition grooves 213 for dividing the corrugated portion 212 into a plurality of parts. When the pressure on the foil assembly 2 is uneven, the corrugated foil 21 in different areas can be adaptively deformed to different degrees, such as Figure 3 shown.

[0069] Specifically, when the dynamic and static pressure hybrid bearing is a thrust bearing, the larger the radial distance from the center of the shaft hole 13, the greater the linear velocity corresponding to the rotating shaft, which causes the deformation of the wave foil 21 corresponding to the area to increase due to the increase in force. In order to solve this problem, the present application provides a plurality of partition grooves 213 arranged radially along the shell 1 on the wave foil 21. The partition grooves 213 are arc grooves extending circumferentially along the shell 1, which can divide the waveform 212 into a plurality of independent parts, so that the deformation of the waveform 212 in each radial area does not affect each other, so that the wave foil 21 in different radial areas undergoes different degrees of adaptive deformation according to the force conditions.

[0070] In some embodiments of this application, please refer to Figure 1 , Figure 2 , Figure 5 and Figure 6A plurality of air holes 3 are provided in the second area 12, and the plurality of air holes 3 are sequentially arranged along the radial direction of the housing 1, so that the static pressure air film can extend along the radial direction of the thrust bearing, thereby realizing reliable support for the shaft shoulder end face. The number and spacing of the air holes 3 can be designed according to the pressure, thickness and rigidity required by the static pressure air film, and are not limited here.

[0071] In some embodiments of the present application, when the dynamic and static pressure mixed gas bearing is a thrust bearing, the first area 11 includes a first mounting area 111 and a second mounting area 112 connected in a stepped manner, the first mounting area 111 protrudes from the second mounting area 112, and the first mounting area 111 is connected between the second area 12 and the second mounting area 112, so that the second area 12, the first mounting area 111 and the second mounting area 112 are connected in a three-level stepped manner, and the air hole 3, the top foil 22 and the wave foil 21 are sequentially arranged in the second area 12, the first mounting area 111 and the second mounting area 112, as shown in FIG. Figures 4 to 8 While the top foil 22 and the bump foil 21 are respectively installed and positioned by the step structure, the length of the second connecting portion 211 in the bump foil 21 is shortened, thereby saving the manufacturing cost of the bump foil 21 .

[0072] In some embodiments of this application, please refer to Figure 1 and Figure 5 The outer periphery of the housing 1 is provided with a plurality of fixing parts 14, which can be used to fix the dynamic and static pressure mixed gas bearing and improve the stability of the dynamic and static pressure mixed gas bearing during operation.

[0073] Specifically, the fixing portion 14 is a semicircular groove, which is convenient for embedding the fixing piece to achieve the installation of the bearing.

[0074] In other embodiments of the present application, when the dynamic and static pressure mixed gas bearing is a radial bearing, the outer peripheral surface of the rotating shaft is the rotating shaft matching surface, see Figures 8 to 12 The shell 1 is a cylindrical structure, the first area 11 and the second area 12 are sequentially arranged along the axial direction of the shell 1, and the first area 11 and the second area 12 are both arranged in an annular shape on the inner circumference of the shaft hole 13. At this time, the first area 11 has a foil assembly 2 arranged in a cylindrical shape. When the shaft rotates at a high speed, a cylindrical dynamic pressure air film can be formed in the first area 11. A plurality of air holes 3 are provided in the second area 12, and air is transmitted through the plurality of air holes 3 to form a cylindrical static pressure air film. The outer circumference of the shaft is radially supported by the dynamic pressure air film and the static pressure air film.

[0075] Specifically, in order to make the first area 11 and the second area 12 connected in a step-like manner, the diameter of the first area 11 is greater than the diameter of the second area 12, and the difference between the radius of the first area 11 and the radius of the second area 12 is H, such as Fig.11 When assembling the foil assembly 2 , it is preferred to insert the foil assembly 2 from the end of the first area 11 away from the second area 12 , which can reduce the difficulty of assembling the foil assembly 2 .

[0076] In some embodiments of this application, please refer to Fig. 9 The multiple air holes 3 in the second zone 12 are evenly arranged along the circumference of the second zone 12, and the axes of the air holes 3 extend radially along the shell 1, so that a cylindrical static pressure air film with uniform thickness can be formed around the shaft hole 13 to achieve uniform radial support for the outer peripheral surface of the rotating shaft.

[0077] It should be noted that the dynamic and static pressure mixed gas bearing provided in the above embodiments of the present application has both the high stability of the dynamic pressure gas bearing and the high load-bearing capacity of the static pressure gas bearing, which can greatly expand the application field of the gas bearing.

[0078] The second aspect of the embodiments of the present application provides a rotating mechanism, including the dynamic and static pressure mixed gas bearing described in any of the above embodiments, and also including a rotating shaft, which is rotatably connected to the shaft hole 13, and the foil assembly 2 and the air hole 3 are both arranged toward the rotating shaft to support the rotating shaft.

[0079] In some embodiments of the present application, when the dynamic and static pressure mixed gas bearing is a thrust bearing, a shoulder for cooperating with the thrust bearing is provided on the rotating shaft, and the foil assembly 2 and the air hole 3 are arranged opposite to the shoulder end face to provide axial support for the shoulder end face.

[0080] In other embodiments of the present application, when the dynamic and static pressure mixed gas bearing is a radial bearing, the rotating shaft is inserted into the axial hole 13 of the shell 1, and the foil assembly 2 and the air hole 3 are arranged opposite to the outer circumference of the rotating shaft to provide radial support for the outer circumference of the rotating shaft.

[0081] In some embodiments of the present application, two dynamic and static pressure mixed gas bearings are symmetrically arranged at both ends of the rotating shaft, so as to achieve uniform axial support or radial support on both ends of the bearings, make the rotating shaft evenly stressed, and improve the stability of the rotating shaft's rotational motion.

[0082] It should be noted that, since the dynamic and static pressure mixed gas bearing in the present application has the characteristics of high load-bearing capacity, high damping, good reliability and good stability, the application scope of the rotating mechanism of the present application is wider.

[0083] The third aspect of the embodiments of the present application provides a turbine device, including the dynamic and static pressure mixed gas bearing described in any of the above embodiments. The traditional rolling bearings and sliding bearings can be replaced by the dynamic and static pressure mixed gas bearings, and the gas is used as the lubricant in the rotating pair, which is conducive to the development of the turbine device towards oil-free direction.

[0084] In other embodiments of the present application, the turbine device includes the rotating mechanism in the above embodiment, and the rotating shaft is provided with blades, and the blades and the rotating shaft can be driven by the fluid to rotate at high speed to achieve energy conversion. Since the dynamic and static pressure mixed gas bearing has the characteristics of low friction and good stability, it is suitable for high-speed and light-load applications such as turbine devices.

[0085] See also Figures 1 to 8 In some embodiments of the present application, when the dynamic and static pressure mixed gas bearing is a thrust bearing, its working method is as follows:

[0086] Step 1: insert the rotating shaft into the shaft hole 13, so that the foil assembly 2 and the air hole 3 on the housing 1 are arranged opposite to the shoulder end face of the rotating shaft;

[0087] Step 2: When the shaft rotates at high speed, the airflow is driven to rotate at high speed. After the airflow flows through the wedge-shaped portion 222 of the top foil 22, a pressure difference is generated on the surface of the top foil 22 to form a dynamic pressure air film. At the same time, high-pressure gas is input toward the end face of the shaft through the air hole 3 to form a static pressure air film between the outlet end face of the air hole 3 and the shoulder end face, providing axial support for the shoulder end face.

[0088] See also Figures 9 to 12 In some other embodiments of the present application, when the dynamic and static pressure mixed gas bearing is a radial bearing, its working method is as follows:

[0089] Step 1: insert the rotating shaft into the shaft hole 13, so that the foil assembly 2 and the air hole 3 on the housing 1 are arranged opposite to the outer peripheral surface of the rotating shaft;

[0090] Step 2: When the shaft rotates at high speed, the airflow is driven to rotate at high speed. After the airflow flows through the wedge-shaped portion 222 of the top foil 22, a pressure difference is generated on the surface of the top foil 22 to form a dynamic pressure air film. At the same time, high-pressure gas is input toward the outer peripheral surface of the shaft through the air hole 3 to form a cylindrical static pressure air film between the gas outlet end surface of the air hole 3 and the outer peripheral surface of the shaft, providing radial support for the outer peripheral surface of the shaft.

[0091] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described in the text are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0092] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0093] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A dynamic and static pressure mixed gas bearing, characterized in that: include: A shell (1), the shell (1) having a first area (11), a second area (12) and an axial hole (13), the first area (11) and the second area (12) being independent of each other, and the first area (11) and the second area (12) are both arranged to extend along the circumference of the axial hole (13); A foil assembly (2), wherein the foil assembly (2) is arranged in the first area (11); An air hole (3), wherein the air hole (3) is arranged in the second zone (12).

2. The dynamic and static pressure mixed gas bearing according to claim 1, characterized in that: The second area (12) is arranged to protrude from the first area (11), and the foil assembly (2) is arranged to protrude from the gas outlet end surface of the gas hole (3).

3. The dynamic and static pressure mixed gas bearing according to claim 2, characterized in that: The second area (12) is connected to the first area (11) in a stepped manner.

4. The dynamic and static pressure mixed gas bearing according to claim 1, characterized in that: The foil assembly (2) comprises a bump foil (21) and a top foil (22), wherein the top foil (22) is arranged on a side of the bump foil (21) away from the housing (1); The top foil (22) comprises a first connecting portion (221), a wedge-shaped portion (222) and a matching portion (223), wherein the first connecting portion (221) is connected to the first zone (11), the wedge-shaped portion (222) is connected between the first connecting portion (221) and the matching portion (223), and the matching portion (223) is arranged in contact with the corrugated foil (21).

5. The dynamic and static pressure mixed gas bearing according to claim 1, characterized in that: The air hole (3) comprises an air inlet section (31) and an air outlet section (32), and the cross-sectional area of ​​the air inlet section (31) is greater than the cross-sectional area of ​​the air outlet section (32).

6. The dynamic and static mixed gas bearing according to any one of claims 1 to 5, characterized in that: The first area (11) and the second area (12) are both in the shape of a fan ring, and the number of the first area (11) and the number of the second area (12) are both multiple, and the multiple first areas (11) and the second areas (12) are alternately arranged on the end surface of the shell (1).

7. The dynamic and static pressure mixed gas bearing according to claim 6, characterized in that: The foil assembly (2) comprises a fan-shaped corrugated foil (21), on which a plurality of partition grooves (213) arranged radially along the shell (1) are provided, and the partition grooves (213) are arc-shaped grooves extending circumferentially along the shell (1).

8. The dynamic and static pressure mixed gas bearing according to claim 6, characterized in that: A plurality of the air holes (3) are provided in each of the second zones (12), and the plurality of the air holes (3) are arranged in sequence along the radial direction of the shell (1).

9. The dynamic and static pressure mixed gas bearing according to claim 6, characterized in that: The first area (11) comprises a first mounting area (111) and a second mounting area (112) connected in a stepped manner, the first mounting area (111) being arranged to protrude from the second mounting area (112), and the first mounting area (111) being connected between the second area (12) and the second mounting area (112).

10. The dynamic and static pressure mixed gas bearing according to claim 6, characterized in that: A plurality of fixing parts (14) are provided on the outer periphery of the housing (1).

11. The dynamic and static mixed gas bearing according to any one of claims 1 to 5, characterized in that: The shell (1) is a cylindrical structure, the first zone (11) and the second zone (12) are arranged in sequence along the axial direction of the shell (1), and the first zone (11) and the second zone (12) are both arranged in an annular shape on the inner circumference of the axial hole (13).

12. The dynamic and static pressure mixed gas bearing according to claim 11, characterized in that: A plurality of air holes (3) are provided in the second zone (12), and the plurality of air holes (3) are evenly arranged along the circumference of the second zone (12), and the axes of the air holes (3) extend along the radial direction of the shell (1).

13. A rotating mechanism, comprising the dynamic and static pressure mixed gas bearing according to any one of claims 1 to 12, characterized in that: It also comprises a rotating shaft, which is rotatably connected to the shaft hole (13), and the foil assembly (2) and the air hole (3) are both arranged towards the rotating shaft.

14. A turbine device, characterized in that: A dynamic and static pressure mixed gas bearing comprising any one of claims 1 to 12; Alternatively, it includes the rotating mechanism as described in claim 13, wherein blades are provided on the rotating shaft.

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