Rotating machinery, air bearings and top foils thereof

Abstract

The present application belongs to the technical field of air bearings, and specifically relates to a rotating machine, an air bearing and a top foil thereof. The bearing housing is used to install the top foil, and a mounting seam is provided on the peripheral side of the bearing housing. The top foil has a fixed portion and a free end facing each other and spaced apart. The top foil also has a first portion located on the side of the fixed portion away from the free end, and the fixed portion is bent relative to the first portion and can be fixed in the mounting seam. An installation space for installing the top foil is provided in the bearing housing, and the installation space includes a first installation position and a second installation position, the first installation position is used to accommodate the first portion, and the second installation position is used to accommodate the free end. A support structure is provided on the bearing housing, and the support structure extends to at least one of the first installation position and the second installation position, so that the support structure abuts against at least one of the outer surface of the first portion and the outer surface of the free end. The present application can solve the problem that the current air bearing cannot keep the rotor in a stable suspended state.

Description

[0001] This application is a divisional application of the applicant's prior application, the application date of which is June 7, 2024, the application number is CN202410733177.6, and the application name is rotating machinery, air bearing and bearing housing thereof. Technical Field

[0002] The present application belongs to the technical field of air bearings, and in particular relates to a rotating machine, an air bearing and a top foil thereof. Background Art

[0003] Air bearings use the principle that the surrounding gas forms a pressure film in the wedge-shaped space between the top foil and the rotor to keep the rotor suspended. Since air bearings can keep the rotor suspended, they have the advantages of high precision, low friction, long life and high speed, and are therefore widely used in the fields of precision machinery industry, medical equipment, etc. However, in practice, the current air bearings cannot keep the rotor in a stable suspended state. Summary of the invention

[0004] The purpose of the present application is to provide a rotating machine, an air bearing and a top foil thereof, which can solve the problem that the current air bearing cannot keep the rotor in a stable suspension state.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application provides a bearing housing of an air bearing, wherein the bearing housing is used to install a top foil, a mounting seam is provided on a peripheral side of the bearing housing, the top foil has a fixed portion and a free end facing each other and spaced apart, the top foil further has a first portion located on a side of the fixed portion away from the free end, the fixed portion is bent relative to the first portion and can be fixed in the mounting seam,

[0007] An installation space for installing the top foil is provided in the bearing housing, and the installation space includes a first installation position and a second installation position, the first installation position is used to accommodate the first part, and the second installation position is used to accommodate the free end. A support structure is provided on the bearing housing, and the support structure extends to at least one of the first installation position and the second installation position so that the support structure abuts against at least one of the outer surface of the first part and the outer surface of the free end.

[0008] In a second aspect, the present application provides an air bearing, comprising a top foil and the above-mentioned bearing housing, wherein the top foil is arranged in an installation space.

[0009] In a third aspect, the present application provides a rotating machine including the above-mentioned air bearing.

[0010] In the present application, an installation space for installing a top foil is provided in the bearing housing, and the installation space includes a first installation position and a second installation position, the first installation position is used to install the first part of the top foil, and the second installation position is used to install the free end of the top foil. A support structure is provided on the bearing housing, and the support structure extends to at least one of the first installation position and the second installation position. In this way, after the top foil is assembled into the installation space, the support structure can abut against at least one of the outer surface of the first part and the outer surface of the free end to support at least one of the first part and the free end, thereby increasing the stiffness of at least one of the first part and the free end. In this way, even if the airflow disturbed by the rotor during rotation impacts the first part and the free end, at least one of the first part and the free end can be prevented from collapsing. Compared with the current air bearing, the bearing housing of the present application can better keep the top foil in an appropriate shape, and thus can better keep the rotor in a stable suspended state. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the structure of an air bearing disclosed in an embodiment of the present application;

[0012] Figure 2 A schematic diagram of a partial structure of the air bearing disclosed in the embodiment of the present application Figure 1 ;

[0013] Figure 3 For this application Figure 2 The enlarged schematic diagram of point A in the middle;

[0014] Figure 4 It is a schematic diagram of the structure of the top foil disclosed in the embodiment of the present application;

[0015] Figure 5 A cross-sectional view of a partial structure of an air bearing disclosed in an embodiment of the present application;

[0016] Figure 6 A schematic diagram of a partial structure of the air bearing disclosed in the embodiment of the present application Figure 2 ;

[0017] Figure 7 For this application Figure 6 The enlarged schematic diagram of point B in the middle;

[0018] Figure 8 It is a schematic diagram of the assembly of the shell body and the air intake connector disclosed in the embodiment of the present application;

[0019] Fig. 9 For this application Figure 8 The enlarged schematic diagram of the center C;

[0020] Fig.10 It is a cross-sectional view of the shell body disclosed in the embodiment of the present application.

[0021] Description of reference numerals:

[0022] 100, bearing housing; 101, mounting seam; 102, slit; 110, supporting structure; 111, first supporting portion; 112, second supporting portion; 120, air inlet; 130, air inlet cavity; 140, air inlet hole; 141, avoidance port; 150, diversion port; 160, shell body; 170, top cover; 180, bottom cover; 200, fluid channel; 300, pin shaft; 400, top foil; 401, gap; 410, fixing portion; 411, sleeve portion; 420, free end; 430, first portion; 500, rotor; 600, air inlet joint. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions 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 creative work are within the scope of protection of this application.

[0024] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0025] The rotating machinery, air bearing and top foil thereof provided in the embodiments of the present application are described in detail below through specific embodiments and their application scenarios in conjunction with the accompanying drawings.

[0026] The inventor discovered that the side wall of the current bearing housing is provided with a mounting seam, the top foil has a fixed portion and a free end facing each other and spaced apart, there is a gap between the fixed portion and the free end, and the top foil also has a first portion located on the side of the fixed portion away from the free end, the fixed portion is bent relative to the first portion and can be fixed in the mounting seam.

[0027] The inventor further discovered that the installation seam is formed by the inner circumferential surface of the bearing housing being sunken. Since a support member for supporting the top foil, such as a support spring made of a shape memory alloy, needs to be installed between the bearing housing and the outer surface of the top foil, the bearing housing is separated from the top foil, and there is a certain distance between the two. When the top foil is installed to the bearing housing, the bearing housing does not abut against the first portion and the free end of the top foil, and the support member will only abut against a part of the circumferential area of ​​the top foil, and it does not abut against the first portion and the free end. It can be seen that the first portion and the free end of the top foil are not supported, and there is a gap between the first portion located on one side of the fixed portion and the free end, that is, the free end and the first portion are both relatively free structures, and the rigidity of both is relatively small. In practice, the rotor will disturb the airflow when it rotates, and the disturbed airflow will cause the first portion and the free end to collapse when it impacts the first portion and the free end, which will make the top foil unable to maintain a proper shape, thereby making the suspension state of the rotor unstable.

[0028] like Figures 1 to 3 as well as Figures 5 to 10 As shown, the embodiment of the present application discloses a bearing housing of an air bearing, the bearing housing 100 is used to install the top foil 400, and a mounting seam 101 is provided on the peripheral side of the bearing housing 100, see Figure 4 The top foil 400 has a fixed portion 410 and a free end 420 facing each other and spaced apart, and the top foil 400 also has a first portion 430 located on a side of the fixed portion 410 away from the free end 420, and the fixed portion 410 is bent relative to the first portion 430 and can be fixed to the installation seam 101. Specifically, the first portion 430 and the free end 420 are both prior art, and the specific structure and positional relationship of the first portion 430 and the free end 420 are not described in detail in this application.

[0029] An installation space for installing the top foil 400 is provided in the bearing housing 100, and the installation space includes a first installation position and a second installation position, the first installation position is used to accommodate the first part 430, and the second installation position is used to accommodate the free end 420, that is, when the top foil 400 is installed in the installation space, the first part 430 is exactly located at the first installation position, and the free end 420 is exactly located at the second installation position, and a support structure 110 is provided on the bearing housing 100, and the support structure 110 extends to at least one of the first installation position and the second installation position, so that the support structure 110 abuts against at least one of the outer surface of the first part 430 and the outer surface of the free end 420.

[0030] In the embodiment of the present application, an installation space for installing the top foil 400 is provided in the bearing housing 100, and the installation space includes a first installation position and a second installation position, the first installation position is used to install the first portion 430 of the top foil 400, and the second installation position is used to install the free end 420 of the top foil 400. A support structure 110 is provided on the bearing housing 100, and the support structure 110 extends to at least one of the first installation position and the second installation position, so that after the top foil 400 is assembled to the installation space, the support structure 110 can be aligned with the outer surface of the first portion 430 and the outer surface of the free end 420. At least one of the first portion 430 and the free end 420 abuts against each other to support at least one of the first portion 430 and the free end 420, thereby increasing the stiffness of at least one of the first portion 430 and the free end 420. In this way, even if the airflow disturbed by the rotor 500 during rotation impacts the first portion 430 and the free end 420, at least one of the first portion 430 and the free end 420 can be prevented from collapsing. Compared with the current air bearing, the bearing housing 100 of the embodiment of the present application can better keep the top foil 400 in an appropriate shape, thereby better keeping the rotor 500 in a stable suspended state.

[0031] Optionally, the bearing housing 100 may include a shell body 160, a top cover 170 and a bottom cover 180, the shell body 160 is a cylindrical structure, the top cover 170 and the bottom cover 180 are respectively and detachably arranged at the two ends of the shell body 160, and the above-mentioned support structure 110 can be arranged on the shell body 160, or on the top cover 170 or the bottom cover 180. The present application does not limit the setting position of the support structure 110.

[0032] Since the air bearing relies on forming a high-pressure air film in the wedge-shaped space between the top foil 400 and the rotor 500 to support the rotor 500 so that the rotor 500 is in a suspended state, in order to enable the rotor 500 to be stably suspended, it is usually necessary to make the pressure distribution of the high-pressure air film uniform. Since the fixed portion 410 and the free end 420 are separated, a gap 401 is formed between the fixed portion 410 and the free end 420, and the wedge-shaped space between the top foil 400 and the rotor 500 is connected to the space between the top foil 400 and the bearing housing 100 through the gap 401. In this way, during the operation of the air bearing, the gas in the wedge-shaped space may leak from the gap 401 to the space between the top foil 400 and the bearing housing 100, which will cause uneven distribution of air pressure in the wedge-shaped space, thereby reducing the stability of the high-pressure air film, causing the rotor 500 to be unable to be stably suspended.

[0033] Therefore, in an optional embodiment, see Figures 2 to 3, the support structure 110 includes a first support portion 111 extending along the axial direction of the bearing housing 100, the first support portion 111 extends to the second installation position, a gap 401 extending along the axial direction of the bearing housing 100 is formed between the fixed portion 410 and the free end 420, and the first support portion 111 can cover at least part of the gap 401 in the circumferential direction of the top foil 400. In this embodiment, the support structure 110 includes a first support portion 111 extending along the axial direction of the bearing housing 100, and the first support portion 111 can cover a part of the gap 401 in the circumferential direction, that is, the first support portion 111 can block a part of the gap 401 in the circumferential direction, so that the first support portion 111 can limit the gas in the wedge-shaped space from passing through the gap 401, so that the gas pressure in the wedge-shaped space is relatively evenly distributed, thereby improving the stability of the high-pressure gas film, so that the rotor 500 can be relatively stably suspended. Of course, the first support portion 111 may not cover the gap 401, and this application is not limited to this.

[0034] In practice, it is necessary to introduce gas into the top foil 400 of the air bearing to form a high-pressure gas film, which requires forming an air inlet channel connected to the space inside the top foil 400 in the bearing housing 100, and introducing gas into the top foil 400 through the air inlet channel. Optionally, the air inlet channel may be located on one side of the top foil 400 along its own axial direction, and in this case, the gas enters the wedge-shaped space between the top foil 400 and the rotor 500 from the end side of the top foil 400, which may fail to form a uniform high-pressure gas film in the wedge-shaped space, resulting in the rotor 500 being unable to stably suspend.

[0035] In order to allow the gas to evenly enter the wedge-shaped space between the top foil 400 and the rotor 500, in an optional embodiment, please continue to refer to Figures 2 to 3 , the fixing portion 410 can be spaced apart from the first supporting portion 111 to form a fluid channel 200 between the fixing portion 410 and the first supporting portion 111, an air inlet 120 is provided on the bearing housing 100, the air inlet 120 is located on the peripheral side of the bearing housing 100 and can be communicated with the fluid channel 200, the fluid channel 200 can extend to the gap 401 and be communicated with the gap 401, that is, the first supporting portion 111 only covers a portion of the gap 401 in the circumferential direction of the top foil 400, and the fluid channel 200 extends to another portion of the gap 401. It should be noted that the air inlet channel described above includes the fluid channel 200 and the air inlet cavity 130 described below. Optionally, an air inlet connector 600 can be provided at the air inlet 120, and gas is introduced into the air inlet 120 through the air inlet connector 600.

[0036] In this embodiment, the fixing portion 410 is spaced apart from the first supporting portion 111, and a fluid channel 200 is formed between the fixing portion 410 and the first supporting portion 111. The air inlet 120 of the bearing housing 100 is located on the peripheral side of the bearing housing 100. The gas introduced from the air inlet 120 can enter the top foil 400 through the fluid channel 200 and the gap 401 in sequence. Since the gap 401 is arranged on the peripheral side of the top foil 400, the gas enters the top foil 400 from the peripheral side of the top foil 400. Since the rotor 500 is penetrated in the top foil 400, the gas entering the top foil 400 from the peripheral side will contact the rotor 500 in the top foil 400, and the gas will be diverted under the obstruction of the rotor 500, so that the gas uniformly surrounds the rotor 500, and the gas is more evenly distributed in the wedge-shaped space between the top foil 400 and the rotor 500, which is conducive to forming a uniform high-pressure gas film so that the rotor 500 is stably suspended.

[0037] In addition, since the fluid channel 200 is located between the first support portion 111 and the fixing portion 410, the first support portion 111 covers a portion of the gap 401 along the circumference of the bearing housing 100, so the gas flow direction of the gas entering the gap 401 from the fluid channel 200 is perpendicular to the width direction of the gap 401, which can make the gas entering from the fluid channel 200 spray vertically on the rotor 500, so that the flow rate of the gas diverted to both sides is roughly the same, which can further improve the uniformity of the gas distribution in the wedge-shaped space. Furthermore, the present embodiment uses the fixing portion 410 and the first support portion 111 to form the fluid channel 200, so there is no need to additionally process the channel for introducing gas on the bearing housing 100, which can reduce the difficulty of processing the bearing housing 100 and simplify the structure of the bearing housing 100.

[0038] Since the cross-sectional area of ​​the air inlet 120 is small, only the portion of the fluid channel 200 opposite to the air inlet 120 has a large gas volume, and the portion of the fluid channel 200 misaligned with the air inlet 120 has a small gas volume. To solve this problem, in an optional embodiment, refer to Figures 5 to 10 The bearing housing 100 is provided with an air inlet cavity 130 located upstream of the fluid channel 200 and corresponding to the fluid channel 200, the air inlet port 120 is communicated with the air inlet cavity 130, and the air inlet cavity 130 extends along the axial direction of the bearing housing 100 and is communicated with the fluid channel 200. Specifically, the air inlet cavity 130 being located upstream of the fluid channel 200 means that the gas first enters the air inlet cavity 130 and then enters the fluid channel 200.

[0039] In this embodiment, the fluid channel 200 is formed between the first support portion 111 and the fixing portion 410, and the first support portion 111 extends along the axial direction of the bearing housing 100, so the fluid channel 200 also extends along the axial direction of the bearing housing 100, that is, the extension length of the fluid channel 200 is relatively long, so in this embodiment, an air inlet cavity 130 extending along the axial direction of the bearing housing 100 is provided on the bearing housing 100, and the air inlet cavity 130 is provided corresponding to the fluid channel 200 and is connected to the fluid channel 200, that is, the air inlet cavity 130 is arranged opposite to the fluid channel 200, and the gas entering the air inlet cavity 130 from the air inlet port 120 will fill the air inlet cavity 130, and the air inlet cavity 130 is arranged corresponding to the fluid channel 200, so the fluid The parts of the body channel 200 corresponding to the air inlet cavity 130 can all receive the gas from the air inlet cavity 130, that is to say, more gas also enters the part where the fluid channel 200 is misaligned with the air inlet port 120, which can increase the air intake volume of the fluid channel 200; in addition, since the air inlet cavity 130 is provided in this embodiment, the gas entering the air inlet cavity 130 from the air inlet port 120 will be dispersed to various parts of the fluid channel 200, so that the gas flow rates of various parts of the fluid channel 200 are roughly equal, so as to avoid the problem of uneven distribution such as the gas volume of the part where the fluid channel 200 corresponds to the air inlet port 120 is larger and the gas volume of the part where the fluid channel 200 is misaligned with the air inlet port 120 is smaller, so as to facilitate the formation of a uniform high-pressure air film.

[0040] In an alternative embodiment, see Figures 3 to 5 An extension portion is extended from a partial area of ​​the edge of the fixing portion 410 away from the first portion 430, and the mounting seam 101 extends to the air inlet cavity 130. A pin shaft 300 is provided in the air inlet cavity 130. The pin shaft 300 blocks the air inlet cavity 130. The extension portion can extend to the air inlet cavity 130 and wrap around a partial area of ​​the pin shaft 300 in its own circumferential direction to form a sleeve portion 411. Specifically, the extension portion can be wound around the pin shaft 300 to form a sleeve portion 411, and the sleeve portion 411 is sleeved on the outside of the pin shaft 300, so that the sleeve portion 411 and the pin shaft 300 can be limitedly matched in the direction extending from one end of the fixing portion 410 away from the first portion 430 to the other end. This can prevent the top foil 400 from moving radially along the bearing housing 100 under factors such as gas impact, so as to keep it in a preset position, thereby preventing the wedge-shaped space formed between the top foil 400 and the rotor 500 from being deformed; it should be noted that the other end of the fixing portion 410 here is the end of the fixing portion 410 close to the first portion 430.

[0041] In addition, to facilitate the processing to form the air inlet cavity 130, the air inlet cavity 130 is usually formed by cutting from the outer surface of the bearing housing 100. After the air inlet cavity 130 is formed, the air inlet cavity 130 will be connected to the external environment. Therefore, the present embodiment uses a pin shaft 300 to seal the air inlet cavity 130 to prevent the air inlet cavity 130 from being connected to the external environment. The present embodiment also uses the pin shaft 300 for sealing the air inlet cavity 130 to limit the top foil 400, thereby achieving the purpose of multiple uses of one object.

[0042] The area where the pin shaft 300 is exposed from the sleeve portion 411 is sunken to form an air guide groove, which extends along the axial direction of the bearing housing 100, and the notch of the air guide groove can face the fluid channel 200 and communicate with the fluid channel 200. In this embodiment, the area where the pin shaft 300 is exposed from the sleeve portion 411 is sunken to form the air guide groove. Since the pin shaft 300 is to block the air inlet cavity 130, the air guide groove does not penetrate the pin shaft 300, and the notch of the air guide groove faces the fluid channel 200 and communicates with the fluid channel 200, which can prevent the pin shaft 300 from blocking the fluid channel 200, so that the fluid channel 200 has a larger air intake.

[0043] Optionally, the bearing housing 100 includes a shell body 160, a top cover 170 and a bottom cover 180, the shell body 160 is a cylindrical structural member, the top cover 170 and the bottom cover 180 are respectively detachably connected to the two ends of the shell body 160, and the air intake cavity 130 can be arranged in the shell body 160. In this case, the air intake cavity 130 extends to at least one end surface of the shell body 160. In this case, a pin shaft 300 is arranged in the air intake cavity 130 to prevent the gas in the air intake cavity 130 from leaking into the external environment from the gap between the shell body 160 and the bottom cover 180 or the top cover 170.

[0044] Generally speaking, the inner space of the bearing housing 100 is usually arranged with a support spring made of shape memory alloy. The support strength of the support spring to the top foil 400 is adjusted by alternately heating and cooling the support spring, and cooling the support spring is usually achieved by introducing cooling gas into the inner space of the bearing housing 100.

[0045] In order to allow the cooling gas to enter the inner space of the bearing housing 100 more evenly, in an optional embodiment, the inner circumference of the bearing housing 100 extends out of the support structure 110, the air inlet 120 extends from the outer circumference of the bearing housing 100 to the inside of the bearing housing 100 to form an air inlet hole 140, and the air inlet cavity 130 is formed by a depression in the inner circumference of the air inlet hole 140. Figure 5As shown, the air inlet 120 can be arranged corresponding to the middle part of the fluid channel 200. At this time, the upper and lower sides of the inner circumference of the air inlet hole 140 are recessed inward to form an air inlet cavity 130. That is to say, a part of the air inlet cavity 130 is located on the upper side of the air inlet hole 140, and the other part of the air inlet cavity 130 is located on the lower side of the air inlet hole 140.

[0046] The bottom wall of the air inlet 140 is provided with an avoidance opening 141, and a part of the end of the fixing part 410 away from the first part 430 can pass through the avoidance opening 141 to enter the air inlet 140. Both sides of the bottom of the air inlet 140 are provided with diverter openings 150, and the air inlet 120 is connected to the internal space of the bearing housing 100 through the diverter openings 150, and the two diverter openings 150 are respectively located on both sides of the fixing part 410. In this embodiment, a part of one end of the fixing part 410 can pass through the avoidance opening 141 to enter the air inlet 140, so that the fixing part 410 can separate the bottom space of the air inlet 140 into two sub-spaces, the two sub-spaces are located on both sides of the fixing part 410, and the two sub-spaces are respectively connected to the internal space of the bearing housing 100 through the diverter openings 150 on both sides, and the gas entering from the air inlet 140 can be separated into two streams of gas under the action of the fixing part 410, so that no other additional diverter structure is required. The two separated gases enter the inner space of the bearing housing 100 from the diversion ports 150 on both sides respectively. That is to say, the present embodiment utilizes the fixing portion 410 to divert the gas so that the gas is evenly diffused to both sides to improve the uniformity of the gas cooling the support spring in the bearing housing 100.

[0047] In an optional embodiment, a support structure 110 extends from the inner circumference of the bearing housing 100, and the support structure 110 includes a first support portion 111 and a second support portion 112 that are spaced apart, the first support portion 111 extends to the second mounting position, the second support portion 112 extends to the first mounting position, a slit 102 is formed between the first support portion 111 and the second support portion 112, the fixing portion 410 is passed through the slit 102, and the mounting slit 101 includes the slit 102. In this embodiment, the support structure 110 includes a first support portion 111 and a second support portion 112, the first support portion 111 is used to support the outer surface of the free end 420, and the second support portion 112 is used to support the outer surface of the first portion 430, so that both the first portion 430 and the free end 420 can be stably supported to prevent the first portion 430 and the free end 420 from collapsing, thereby maintaining the rotor 500 in a stable suspended state. In addition, a slit 102 is formed between the first support portion 111 and the second support portion 112, and the installation slit 101 includes the slit 102, that is, the fixing portion 410 will be installed in the slit 102. Since the first support portion 111 and the second support portion 112 both protrude from the inner circumferential surface of the bearing housing 100, and the first support portion 111 and the second support portion 112 both extend toward the axis of the bearing housing 100 for a certain length, the slit 102 extends toward the axis of the bearing housing 100 for a longer length, which can increase the contact length between the fixing portion 410 and the bearing housing 100, so that the top foil 400 can be more stably fixed to the bearing housing 100.

[0048] In a further embodiment, a fluid channel 200 is formed between the first support portion 111 and the second support portion 112 , a gap 401 is formed between the free end 420 and the fixed portion 410 , the fluid channel 200 is connected to the gap 401 , and gas can be introduced into the top foil 400 through the fluid channel 200 and the gap 401 .

[0049] Furthermore, the fluid channel 200 may be located between the fixed portion 410 and the first supporting portion 111; alternatively, a notch may be provided at the edge of the fixed portion 410 away from the first portion 430, and the notch passes through the fixed portion 410. In this case, a portion of the fluid channel 200 is located between the first supporting portion 111 and the second supporting portion 112, and another portion is located between the fixed portion 410 and the first supporting portion 111.

[0050] The embodiment of the present application also discloses an air bearing, comprising a top foil 400 and the bearing housing 100 described in any of the above embodiments, wherein the top foil 400 is arranged in the installation space. Since the present application includes the above bearing housing 100, the air bearing has the beneficial effects of the above bearing housing 100, which will not be described in detail here.

[0051] In an optional embodiment, a third mounting position is provided on the bearing housing 100, the mounting seam 101 extends to the third mounting position, a pin shaft 300 is provided in the third mounting position, and one end of the fixing portion 410 away from the first portion 430 extends to the third mounting position and winds around the pin shaft 300 to form a sleeve portion 411. It should be noted that when this embodiment is combined with the embodiment of "a pin shaft 300 is provided in the air inlet cavity 130", the air inlet cavity 130 includes the third mounting position.

[0052] In this embodiment, one end of the fixing portion 410 away from the first portion 430 is wound around the pin shaft 300 to form a sleeve portion 411, and the sleeve portion 411 is sleeved on the outside of the pin shaft 300, so that the sleeve portion 411 and the pin shaft 300 can be limitedly matched in the direction extending from one end of the fixing portion 410 away from the first portion 430 to the other end. This can prevent the top foil 400 from moving radially along the bearing housing 100 under factors such as gas impact, so as to keep it in a preset position, thereby preventing the wedge-shaped space formed between the top foil 400 and the rotor 500 from being deformed; it should be noted that the other end of the fixing portion 410 here is the end of the fixing portion 410 close to the first portion 430.

[0053] The embodiment of the present application also discloses a rotary machine, including the above-mentioned air bearing. In this way, the rotary machine has the beneficial effects of the above-mentioned air bearing, which will not be described in detail here. Optionally, the rotary device is a device that uses the above-mentioned air bearing to achieve rotary drive, and its type is not limited. For example, the rotary machine can be an air compressor, an air cycle machine, a high-speed motor, a micro turbojet engine, etc.

[0054] The above embodiments of the present application focus on the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. Considering the simplicity of the text, they will not be repeated here. The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the present application, ordinary technicians in this field can also make many forms without departing from the scope of protection of the purpose of the present application and the claims, all of which are within the protection of the present application.

Claims

1. An air bearing, characterized in that: The invention comprises a bearing housing (100) and a top foil (400), wherein the top foil (400) comprises a fixed portion (410) and a free end (420) which are arranged facing each other and spaced apart from each other, and the top foil (400) further comprises a first portion (430) located on a side of the fixed portion (410) away from the free end (420); The bearing housing (100) is provided with a mounting slit (101) and a third mounting position, the mounting slit (101) extends to the third mounting position, a mounting space is provided in the bearing housing (100), the top foil (400) is installed in the mounting space, and the fixing portion (410) is bent relative to the first portion (430) and can be fixed in the mounting slit (101); A pin shaft (300) is provided in the third installation position, and one end of the fixing portion (410) which is away from the first portion (430) extends to the third installation position and is wound around the pin shaft (300) to form a sleeve portion (411); The installation space comprises a first installation position and a second installation position, the first part (430) is arranged at the first installation position, the free end (420) is arranged at the second installation position, a support structure (110) is provided on the bearing housing (100), the support structure (110) extends to at least one of the first installation position and the second installation position, and the support structure (110) abuts against at least one of an outer surface of the first part (430) and an outer surface of the free end (420); The support structure (110) comprises a first support portion (111) extending along the axial direction of the bearing housing (100), the first support portion (111) extending to the second mounting position, a gap (401) extending along the axial direction of the bearing housing (100) is formed between the fixing portion (410) and the free end (420), and the first support portion (111) covers at least a portion of the gap (401) in the circumferential direction of the top foil (400).

2. The air bearing according to claim 1, characterized in that The fixing portion (410) and the first supporting portion (111) are arranged at intervals to form a fluid channel (200) between the fixing portion (410) and the first supporting portion (111); an air inlet (120) is provided on the bearing housing (100); the air inlet (120) is located on the peripheral side of the bearing housing (100) and is connected to the fluid channel (200); the fluid channel (200) extends to the gap (401) and is connected to the gap (401).

3. The air bearing according to claim 2, characterized in that The bearing housing (100) is provided with an air intake cavity (130) located upstream of the fluid channel (200) and arranged corresponding to the fluid channel (200); the air intake port (120) is communicated with the air intake cavity (130); the air intake cavity (130) extends along the axial direction of the bearing housing (100) and is communicated with the fluid channel (200).

4. The air bearing according to claim 3, characterized in that The inner circumferential surface of the bearing housing (100) extends out of the support structure (110); the air inlet (120) extends from the outer circumferential surface of the bearing housing (100) toward the inside of the bearing housing (100) to form an air inlet hole (140); the air inlet cavity (130) is formed by being recessed from the inner circumferential surface of the air inlet hole (140); a hole bottom wall of the air inlet hole (140) is provided with an escape opening (141); a portion of an end of the fixing portion (410) that is away from the first portion (430) passes through the escape opening (141) and enters the air inlet hole (140); Diversion ports (150) are provided on both sides of the bottom of the air inlet (140); the air inlet (120) is connected to the internal space of the bearing housing (100) via the diversion ports (150); and the two diversion ports (150) are respectively located on both sides of the fixing portion (410).

5. The air bearing according to claim 1, wherein: The support structure (110) extends from the inner circumferential surface of the bearing housing (100), the support structure (110) comprising a first support portion (111) and a second support portion (112) which are arranged at an interval, the first support portion (111) extending to the second installation position, and the second support portion (112) extending to the first installation position. A slit (102) is formed between the first supporting portion (111) and the second supporting portion (112), the fixing portion (410) is inserted through the slit (102), and the installation seam (101) includes the slit (102).

6. A rotating machine, characterized in that: Comprising the air bearing according to any one of claims 1 to 5.

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