Air bearing and rotating machine

Abstract

The utility model belongs to the technical field of air bearings, and particularly relates to an air bearing and a rotating machine. The air bearing comprises an installation part and a cooling pipe, the installation part is used for installing a supporting part capable of supporting a top foil, the supporting part is made of shape memory alloy, the cooling pipe is correspondingly arranged on one side of the installation part and can penetrate through the supporting part, and multiple sets of cooling holes distributed at intervals in the axial direction of the cooling pipe are formed in the cooling pipe. Each group of cooling holes comprises a plurality of sub-holes which are distributed at intervals in the circumferential direction of the cooling pipe, and in the arrangement direction between the mounting piece and the cooling pipe, the sub-holes located in the side, close to the mounting piece, of the cooling pipe and the mounting piece are arranged in a staggered mode. By adopting the air bearing provided by the embodiment of the invention, the cooling gas can be dispersed more uniformly, so that the supporting piece is uniformly cooled, the supporting piece is recovered to the original shape to stably support the top foil, and the rigidity performance of the air bearing is optimized.

Description

Technical Field

[0001] The present application belongs to the technical field of air bearings, and in particular relates to an air bearing and a rotating machine. Background Art

[0002] Air bearings use the principle that the surrounding gas forms a pressure air film in the wedge-shaped space between the top foil and the rotor to achieve rotary support and lubrication. Air bearings use air as the lubrication medium and have the advantages of simple structure, strong adaptability to conditions and high speed. Therefore, they have been widely used in the fields of precision machinery industry, medical equipment, etc.

[0003] In order to ensure the stiffness of the air bearing, the related art uses a support spring made of shape memory alloy to support the top foil. However, in practice, the stiffness performance of the air bearing in which the top foil is supported by the above-mentioned support spring is still insufficient. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide an air bearing and a rotating machine, which can solve the problem of insufficient stiffness performance of current air bearings.

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

[0006] In a first aspect, an embodiment of the present application provides an air bearing, comprising a mounting member and a cooling tube, wherein the mounting member is used to mount a support member capable of supporting a top foil, the support member being made of a shape memory alloy, the cooling tube being correspondingly arranged on one side of the mounting member and being capable of being inserted into the support member, the cooling tube being provided with a plurality of groups of cooling holes spaced apart along its axial direction, each group of cooling holes comprising a plurality of sub-holes spaced apart along the circumference of the cooling tube,

[0007] In the arrangement direction between the mounting member and the cooling pipe, the sub-hole located on the side of the cooling pipe close to the mounting member is staggered with the mounting member.

[0008] In a second aspect, an embodiment of the present application provides a rotating machine, comprising the above-mentioned air bearing.

[0009] In an embodiment of the present application, the cooling tube is provided with a plurality of groups of cooling holes spaced apart along its axial direction, and each group of cooling holes includes a plurality of sub-holes spaced apart along the circumferential direction of the cooling tube, so that the cooling gas can be dispersed not only into a plurality of streams of gas distributed along the vertical direction when passing through the cooling tube, but also each stream of gas distributed in the vertical direction can be dispersed into a plurality of sub-streams of gas distributed along the circumferential direction. That is to say, the air bearing using the embodiment of the present application can disperse the cooling gas more evenly, thereby uniformly cooling the support member, so that the support member can be restored to its original shape to stably support the top foil, thereby optimizing the stiffness performance of the air bearing.

[0010] In addition, in the arrangement direction between the mounting member and the cooling pipe, the sub-hole located on the side of the cooling pipe close to the mounting member is staggered with the mounting member, so that the mounting member can avoid blocking the sub-hole, which allows more cooling gas to enter or be discharged from the corresponding area on the cooling pipe, thereby further optimizing the uniform flow effect; in addition, the mounting member does not block the sub-hole, so that all the sub-holes are facing the support member, so that all the cooling gas entering or being discharged from the cooling pipe can cool the support member, thereby allowing the cooling gas to better cool the support member. 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 This is a schematic diagram of the assembly of the mounting member, the support member and the cooling pipe disclosed in the embodiment of the present application;

[0014] Figure 4 This is a schematic diagram of the structure of the cooling tube disclosed in the embodiment of the present application;

[0015] Figure 5 A schematic diagram of a partial structure of the air bearing disclosed in the embodiment of the present application Figure 2 ;

[0016] Figure 6 A cross-sectional view of a partial structure of an air bearing disclosed in an embodiment of the present application;

[0017] Figure 7 A schematic diagram of a partial structure of the air bearing disclosed in the embodiment of the present application Figure 3 , and an enlarged schematic diagram of point A therein;

[0018] Figure 8 This is a schematic diagram of the structure of the bottom cover disclosed in the embodiment of the present application;

[0019] Fig. 9 An exploded schematic diagram of the bottom cover disclosed in an embodiment of the present application.

[0020] Description of reference numerals:

[0021] 100, mounting part; 200, cooling pipe; 210, sub-hole; 300, bearing housing; 310, air inlet; 320, air outlet; 330, air inlet structure; 331, fluid channel; 332, first inlet; 333, second inlet; 334, air inlet cavity; 335, air inlet section; 340, air outlet cavity; 350, shell body; 360, top cover; 370, bottom cover; 371, jack; 410, top foil; 420, support member; 510, air inlet connector; 520, air outlet connector; 610, rotor. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] The air bearing and rotating machinery 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.

[0025] The inventor found that in the process of using the air bearing, the support spring needs to be heated and cooled alternately. The related art uses a cooling tube to cool the support spring. The cooling tube has multiple groups of cooling holes spaced apart in the vertical direction. When the cooling gas passes through the cooling tube, it will be dispersed into multiple streams of gas distributed in the vertical direction, thereby cooling the support spring. However, the number of each group of cooling holes in the related art is only one. Obviously, the cooling tube cannot disperse the cooling gas more evenly, so the support spring cannot be evenly cooled, which will cause the support spring to be unable to return to its original shape to stably support the top foil, thereby deteriorating the stiffness performance of the air bearing.

[0026] like Figures 1 to 9As shown, the embodiment of the present application discloses an air bearing, including a mounting member 100 and a cooling tube 200, the mounting member 100 is used to mount a support member 420 capable of supporting a top foil 410, the support member 420 is made of a shape memory alloy, the cooling tube 200 is correspondingly arranged on one side of the mounting member 100 and can be penetrated in the support member 420, and the cooling tube 200 is provided with a plurality of groups of cooling holes spaced along its own axial direction, and each group of cooling holes includes a plurality of sub-holes 210 spaced along the circumferential direction of the cooling tube 200. Optionally, the support member 420 here can be a support spring, and the sub-hole 210 can be a round hole, a square hole, etc.

[0027] In the arrangement direction between the mounting member 100 and the cooling pipe 200 , the sub-hole 210 located on the side of the cooling pipe 200 close to the mounting member 100 is staggered with respect to the mounting member 100 .

[0028] In an embodiment of the present application, the cooling tube 200 is provided with a plurality of groups of cooling holes spaced apart along its own axial direction, and each group of cooling holes includes a plurality of sub-holes 210 spaced apart along the circumferential direction of the cooling tube 200, so that the cooling gas can be dispersed not only into a plurality of streams of gas distributed in the vertical direction when passing through the cooling tube 200, but each stream of gas distributed in the vertical direction can also be dispersed into a plurality of sub-streams of gas distributed in the circumferential direction. That is to say, the air bearing using the embodiment of the present application can disperse the cooling gas more evenly, thereby uniformly cooling the support member 420, so that the support member 420 can be restored to its original shape to stably support the top foil 410, thereby optimizing the stiffness performance of the air bearing.

[0029] In addition, in the arrangement direction between the mounting member 100 and the cooling tube 200, the sub-hole 210 located on the side of the cooling tube 200 close to the mounting member 100 is offset from the mounting member 100, thereby preventing the mounting member 100 from blocking the sub-hole 210, which allows more cooling gas to enter or be discharged from the corresponding area on the cooling tube 200, thereby further optimizing the uniform flow effect; in addition, the mounting member 100 does not block the sub-hole 210, so that all the sub-holes 210 are directed toward the support member 420, so that all cooling gas entering or being discharged from the cooling tube 200 can cool the support member 420, thereby allowing the cooling gas to better cool the support member 420.

[0030] In an optional embodiment, the air bearing further includes a bearing housing 300, the mounting member 100 is disposed in the bearing housing 300, the mounting member 100 and the cooling pipe 200 are both disposed in the bearing housing 300, an air inlet 310 is disposed on the peripheral side of the bearing housing 300, the cooling pipe 200 is disposed toward the air inlet 310, and some of the sub-holes 210 on the cooling pipe 200 are disposed toward the air inlet 310. Optionally, the air bearing may further include an air inlet connector 510, the air inlet connector 510 is disposed at the air inlet 310, and cooling gas may be introduced into the air inlet 310 through the air inlet connector 510.

[0031] In this embodiment, the cooling pipe 200 is arranged toward the air inlet 310, and some of the sub-holes 210 on the cooling pipe 200 are arranged toward the air inlet 310 of the bearing housing 300, so that the cooling gas entering from the air inlet 310 can directly enter the part of the sub-holes 210, which helps to make the flow of the cooling gas smoother, so as to improve the cooling effect on the support member 420. It should be noted that, when there are multiple mounting members 100 and cooling pipes 200, each mounting member 100 is arranged corresponding to each cooling pipe 200, in which case one of the cooling pipes 200 can be arranged toward the air inlet 310, and some of the sub-holes 210 of the cooling pipe 200 can be arranged toward the air inlet 310.

[0032] Optionally, the air inlet 310 may not be arranged on the circumferential side of the bearing housing 300, and it may also be arranged on one side of the bearing housing 300 along its own axial direction, that is, the end side of the bearing housing 300. This application does not limit the setting position of the air inlet 310.

[0033] In an optional embodiment, the bearing housing 300 is further provided with an air outlet 320 , and the air inlet 310 and the air outlet 320 are respectively located at two ends of the bearing housing 300 along its own axis. Optionally, the air bearing further includes an air outlet connector 520 , and the air outlet connector 520 is provided at the air outlet 320 .

[0034] If the air inlet 310 is disposed at the middle of the bearing housing 300 and the air outlet 320 is disposed at the second end of the bearing housing 300, since the air outlet 320 is usually subjected to a suction force, the gas entering the middle of the bearing housing 300 from the air inlet 310 will be quickly sucked to the second end of the bearing housing 300, that is, less cooling gas will flow to the first end of the bearing housing 300, which will weaken the cooling effect of the cooling gas on the portion of the support member 420 located at the first end of the bearing housing 300. In this embodiment, the air inlet 310 is located at the first end of the bearing housing 300 and the air outlet 320 is located at the second end of the bearing housing 300. The cooling gas entering from the air inlet 310 will enter the first end of the bearing housing 300 and will be sucked to the second end of the bearing housing 300, and the cooling gas entering from the air inlet 310 will all enter the first end of the bearing housing 300, thereby improving the cooling effect of the cooling gas on the portion of the support member 420 located at the first end of the bearing housing 300.

[0035] In an optional embodiment, a top foil 410 is provided in the bearing housing 300, a cooling space is formed between the top foil 410 and the bearing housing 300, the mounting member 100 and the cooling pipe 200 are provided in the cooling space, the cooling space includes a plurality of cooling areas sequentially distributed in the circumferential direction of the bearing housing 300, a plurality of mounting members 100 and a plurality of cooling pipes 200 are provided at intervals in each cooling area, a plurality of air inlets 310 are provided at intervals on the circumferential side of the bearing housing 300, each air inlet 310 is provided corresponding to each cooling area, that is, each air inlet 310 is connected to each cooling area. In this embodiment, a plurality of air inlets 310 are provided at intervals on the circumferential side of the bearing housing 300, each air inlet 310 is connected to each cooling area, and cooling gas can be introduced into each cooling area through each air inlet 310, which can not only increase the coverage area of ​​the cooling gas, but also more evenly distribute the cooling gas, reduce local hot spots, and thus improve the cooling effect on the support member 420. Of course, the number of the air inlet 310 may be only one, and the present application does not limit the number of the air inlet 310 .

[0036] In an optional embodiment, the portion of the bearing housing 300 provided with the air inlet 310 is the air inlet portion, the number of the air inlet portions is multiple, at least one of the air inlet portions is provided with an air inlet structure 330, a fluid channel 331 connected to the air inlet 310 is formed in the air inlet structure 330, the fluid channel 331 has a first inlet 332 and a second inlet 333 connected to the cooling space, the first inlet 332 and the second inlet 333 are respectively located on both sides of the air inlet structure 330 along the circumference of the bearing housing 300. If the bearing housing 300 is not provided with the air inlet structure 330, the cooling gas introduced from the air inlet 310 will first hit the top foil 410, and then the cooling gas will be diverted to both sides under the obstruction of the top foil 410, which may cause uneven distribution of the cooling gas on both sides. In the present embodiment, at least one air intake portion of the bearing housing 300 is provided with an air intake structure 330, and a fluid channel 331 is formed in the air intake structure 330. The first inlet 332 and the second inlet 333 of the fluid channel 331 are respectively located on both sides of the air intake structure 330 along the circumference of the bearing housing 300, so that the cooling gas introduced into the air inlet 310 will be directly guided to the two sides of the air intake structure 330. In other words, the cooling gas will not directly hit the top foil 410, so that the cooling gas guided to the two sides of the air intake structure 330 can be distributed more evenly.

[0037] In an optional embodiment, the fluid channel 331 includes an air inlet cavity 334 and an air inlet section 335, the air inlet cavity 334 is located upstream of the air inlet section 335, the air inlet port 310 extends to the air inlet cavity 334, and the air inlet section 335 has a first inlet 332 and a second inlet 333. In this embodiment, the fluid channel 331 includes an air inlet cavity 334 and an air inlet section 335 located downstream of the air inlet cavity 334, the air inlet port 310 extends to the air inlet cavity 334 and is connected to the air inlet cavity 334, the cooling gas introduced from the air inlet port 310 will first enter the air inlet cavity 334 and then enter the air inlet section 335, and the air inlet cavity 334 has a large volume, so the air inlet cavity 334 can stabilize the pressure of the cooling gas, thereby ensuring that the cooling gas has a better cooling effect on the support 420.

[0038] In an optional embodiment, a plurality of air outlets 320 and a plurality of mutually isolated air outlet cavities 340 are further provided in the bearing housing 300. The plurality of air outlet cavities 340 are distributed at intervals along the circumference of the bearing housing 300. Each air outlet cavity 340 is respectively arranged corresponding to each cooling area. Each air outlet 320 extends to each cooling area and is connected to the cooling area. At least part of the cooling pipes 200 in each cooling area extend to the corresponding air outlet cavity 340 and are connected to the air outlet cavity 340.

[0039] In this embodiment, each cooling area is provided with an air outlet cavity 340, and each air outlet cavity 340 is provided with an air outlet 320. The air outlet 320 is usually subjected to suction force. The air outlet cavity 340 is connected with the cooling area through at least part of the cooling pipe 200 provided in the cooling area. The cooling gas entering from each air inlet 310 will enter the corresponding cooling area respectively. Under the action of the suction force of the air outlet 320, the cooling gas will pass through the sub-holes 210 of each cooling pipe 200 from the cooling area and enter each cooling pipe 200, thereby evenly dissipating the heat of the support member 420 sleeved on the outside of the cooling pipe 200. The cooling gas entering the cooling pipe 200 will be guided to the air outlet cavity 340 by the cooling pipe 200, so as to be discharged through the air outlet 320. It can be seen that the number of air outlets 320 provided in this embodiment only needs to match the number of cooling areas, and there is no need to configure an air outlet 320 for each cooling pipe 200, which can simplify the structure of the air bearing.

[0040] In an optional embodiment, each air inlet 310 is arranged in the middle of each cooling area along the circumference of the bearing housing 300, so that the cooling gas introduced through the air inlet 310 will enter the middle of the corresponding cooling area, and then diffuse to both sides of the corresponding cooling area, which can improve the uniformity of the air intake.

[0041] In an optional embodiment, the cooling pipe 200 located in the middle of the cooling area is isolated from the air outlet cavity 340. In this embodiment, since the air inlet 310 is arranged corresponding to the middle of the cooling area, if the cooling pipe 200 in the middle of the cooling area is connected to the air outlet cavity 340, part of the cooling gas entering from the air inlet 310 will be sucked into the air outlet cavity 340 through the cooling pipe 200 in the middle, which will reduce the flow of the cooling gas flowing to both sides of the cooling area, thereby reducing the cooling effect on the support members 420 on both sides; and this embodiment isolates the cooling pipe 200 located in the middle of the cooling area from the air outlet cavity 340, so as to prevent part of the cooling gas entering from the air inlet 310 from being sucked into the air outlet cavity 340 by the cooling pipe 200 in the middle, so as to improve the cooling effect on the support members 420 on both sides.

[0042] Optionally, the bearing housing 300 includes a shell body 350, a top cover 360 and a bottom cover 370, the top cover 360 and the bottom cover 370 are respectively detachably connected to the two ends of the shell body 350, the air outlet cavity 340 is provided on the bottom cover 370, and a socket 371 is provided on the bottom cover 370, the socket 371 extends to the air outlet cavity 340, and a part of the cooling pipe 200 is inserted in the socket 371.

[0043] The present application also discloses a rotary machine, including the air bearing described in any of the above embodiments. In this way, the rotary machine has the beneficial effects of the above air bearing, which will not be described in detail here. Optionally, the rotary device is a device that uses the above 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.

[0044] Optionally, the rotary machine further includes a rotor 610 , and the rotor 610 is disposed in the top foil 410 of the air bearing.

[0045] 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 mounting member (100) and a cooling tube (200), wherein the mounting member (100) is used to mount a support member (420) capable of supporting a top foil (410), wherein the support member (420) is made of a shape memory alloy, and the cooling tube (200) is arranged on one side of the mounting member (100) and can be inserted into the support member (420). The cooling tube (200) is provided with a plurality of groups of cooling holes spaced apart along its axial direction, and each group of cooling holes comprises a plurality of sub-holes (210) spaced apart along the circumference of the cooling tube (200). In the arrangement direction between the mounting member (100) and the cooling pipe (200), the sub-hole (210) located on a side of the cooling pipe (200) close to the mounting member (100) is arranged in a staggered manner with respect to the mounting member (100).

2. The air bearing according to claim 1, characterized in that The air bearing further comprises a bearing housing (300), the mounting member (100) being arranged in the bearing housing (300), the mounting member (100) and the cooling pipe (200) being arranged inside the bearing housing (300), an air inlet (310) being arranged on the peripheral side of the bearing housing (300), the cooling pipe (200) being arranged towards the air inlet (310), and part of the sub-holes (210) on the cooling pipe (200) being arranged towards the air inlet (310).

3. The air bearing according to claim 2, characterized in that An air outlet (320) is also provided on the bearing housing (300), and the air inlet (310) and the air outlet (320) are respectively located at two ends of the bearing housing (300) along its own axial direction.

4. The air bearing according to claim 2, characterized in that A top foil (410) is provided in the bearing housing (300), a cooling space is formed between the top foil (410) and the bearing housing (300), the mounting member (100) and the cooling pipe (200) are provided in the cooling space, the cooling space comprises a plurality of cooling areas sequentially distributed in a circumferential direction of the bearing housing (300), a plurality of the mounting members (100) and a plurality of the cooling pipes (200) are provided at intervals in each cooling area, A plurality of air inlets (310) are provided at intervals on the circumferential side of the bearing housing (300), and each of the air inlets (310) is provided corresponding to each of the cooling areas.

5. The air bearing according to claim 4, characterized in that The part of the bearing housing (300) provided with the air inlet (310) is an air inlet part, there are a plurality of air inlet parts, at least one of which is provided with an air inlet structure (330). A fluid channel (331) connected to the air inlet (310) is formed in the air intake structure (330); the fluid channel (331) has a first inlet (332) and a second inlet (333) connected to the cooling space; the first inlet (332) and the second inlet (333) are respectively located on two sides of the air intake structure (330) along the circumference of the bearing housing (300).

6. The air bearing according to claim 5, characterized in that The fluid channel (331) comprises an air intake cavity (334) and an air intake section (335), wherein the air intake cavity (334) is located upstream of the air intake section (335), the air intake port (310) extends to the air intake cavity (334), and the air intake section (335) has the first inlet (332) and the second inlet (333).

7. The air bearing according to claim 4, characterized in that The bearing housing (300) is further provided with a plurality of air outlets (320) and a plurality of mutually isolated air outlet cavities (340), the plurality of air outlet cavities (340) being distributed at intervals along the circumference of the bearing housing (300), each of the air outlet cavities (340) being arranged corresponding to each of the cooling regions, and each of the air outlets (320) extending to each of the cooling regions and being in communication with the cooling regions. At least part of the cooling pipe (200) in each cooling area extends to the corresponding air outlet cavity (340) and is in communication with the air outlet cavity (340).

8. The air bearing according to claim 7, characterized in that Each of the air inlets (310) is arranged corresponding to each of the cooling areas along the middle of the circumference of the bearing housing (300).

9. The air bearing according to claim 8, characterized in that The cooling pipe (200) located in the middle of the cooling area is isolated from the air outlet cavity (340).

10. A rotating machine, characterized in that: Comprising the air bearing according to any one of claims 1 to 9.

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