CN217682807U - Air bearing, rotor assembly, compressor and heating and ventilation equipment - Google Patents

Abstract

The utility model discloses an air supporting bearing, rotor assembly, compressor and warm equipment of leading to, air supporting bearing is including the mount pad that stacks gradually, ripples paper tinsel and top paper tinsel subassembly, and top paper tinsel subassembly includes one or a plurality of top paper tinsels that stack up, and top paper tinsel subassembly has first paper tinsel section and second paper tinsel section, and the thickness of first paper tinsel section and second paper tinsel section is different. Therefore, the utility model discloses an air supporting bearing can balance local radial load, and bearing capacity increases, and stability can improve.

Description

Air bearing, rotor assembly, compressor and heating and ventilation equipment

Technical Field

The utility model relates to a compressor technical field, concretely relates to air supporting bearing, rotor assembly, compressor and warm logical equipment.

Background

During the peak period in summer, the increase of the refrigeration load of an air conditioner and the like not only brings heavy burden to a power grid, but also generates a large amount of greenhouse gas emission. Therefore, the promotion of green high-efficiency refrigeration is an important and urgent need for promoting energy conservation and emission reduction and coping with climate change in various countries.

The core component of the refrigeration system is a refrigeration compressor, in the conventional refrigeration compressor, a lubricating medium of a sliding bearing is lubricating oil, but the lubricating medium has high viscosity, can generate high friction power consumption at high rotating speed, and in addition, the existence of the lubricating oil can influence the heat exchange effect of a heat exchanger after long-term use, so that the performance of the refrigeration system is reduced. The magnetic suspension bearing has the advantages of low friction loss and good stability, but the cost is higher, and the advantages are not obvious in the application of small and medium-sized compressors.

The dynamic pressure gas bearing has the advantages of high rotating speed, high efficiency and low friction loss, and is very suitable for small and medium-sized compressors. The foil gas dynamic pressure bearing is divided into a radial foil gas dynamic pressure bearing and an axial foil gas dynamic pressure bearing, the radial foil gas dynamic pressure bearing is used for supporting the rotor to be in radial suspension, and the axial foil gas dynamic pressure bearing is used for supporting the axial suspension to avoid axial movement; however, the air bearing has the advantages of small gas viscosity coefficient, large leakage, low bearing capacity, low rigidity and damping of the pneumatic-pneumatic air suspension bearing and poor operation stability.

Therefore, the existing air bearing needs to be improved.

SUMMERY OF THE UTILITY MODEL

The present invention aims at solving at least one of the technical problems in the related art to a certain extent. Therefore, an object of the utility model is to provide an air supporting bearing, rotor assembly, compressor and warm logical equipment, this air supporting bearing can balance local radial load, and bearing capacity increases, and stability can improve.

In one aspect of the present invention, the present invention provides an air bearing. According to the utility model discloses an embodiment, this air bearing includes the mount pad, ripples foil and the top foil subassembly that stack gradually, the top foil subassembly includes one or a plurality of top foils that range upon range of, the top foil subassembly has first paper tinsel section and second paper tinsel section, first paper tinsel section with the thickness of second paper tinsel section is different.

According to the utility model discloses air bearing is through stacking gradually mount pad, ripples paper tinsel and top paper tinsel subassembly to the top paper tinsel subassembly that has first paper tinsel section and second paper tinsel section includes one or a plurality of top paper tinsels that range upon range of, and the thickness of first paper tinsel section and second paper tinsel section is different simultaneously, thereby this air bearing can balance local radial load, and bearing capacity increases, and stability can improve.

In addition, the air bearing according to the above embodiment of the present invention may further have the following additional technical features:

in some embodiments of the present invention, the first foil section and the second foil section are located on the same top foil, and the first foil section and the second foil section are arranged along a circumferential direction of the air bearing.

In some embodiments of the present invention, the first foil section and/or the second foil section include a plurality of foil sections, and the first foil section and the second foil section are staggered in the circumferential direction of the air bearing.

In some embodiments of the present invention, the thickness of the top foil varies uniformly along the circumference of the air bearing.

In some embodiments of the present invention, the first foil section and the second foil section are located on the same top foil, the first foil section and the second foil section are arranged in a transverse direction, the transverse direction is the circumferential direction of the air bearing and the direction from the mounting seat to the top foil all have an included angle greater than 0 ° and less than or equal to 90 °.

In some embodiments of the present invention, the first foil section and/or the second foil section comprises a plurality of foil sections, and the first foil section and the second foil section are staggered in the transverse direction.

In some embodiments of the invention, the thickness of the top foil varies uniformly in the transverse direction.

In some embodiments of the invention, the top foil assembly comprises a stack of top foils, the first foil section and the second foil section being provided on different top foils, respectively.

In some embodiments of the invention, the first foil section and the second foil section are stacked in a direction from the mount to the top foil assembly.

In some embodiments of the present invention, one end of the top foil is connected to the mounting seat and extends along a circumferential direction of the air bearing, and a thickness of the top foil is uniformly changed along the circumferential direction of the air bearing.

In some embodiments of the present invention, the air bearing is a radial air bearing or an axial air bearing.

In a second aspect of the present invention, the present invention provides a rotor assembly. The rotor assembly includes a rotor, the rotor assembly further includes: the radial air bearing is sleeved on the periphery of the rotor and is the air bearing, and the mounting seat, the wave foil and the top foil of the radial air bearing are sequentially laminated from outside to inside along the radial direction of the rotor; and/or the axial air bearing is matched with the rotor, the axial air bearing is the air bearing, and the mounting seat, the wave foil and the top foil of the axial air bearing are sequentially stacked along the axial direction of the rotor.

In a third aspect of the present invention, the present invention provides a compressor. The compressor comprises the air bearing; or a rotor assembly as described above.

In a fourth aspect of the present invention, the present invention provides a heating and ventilation device. The heating and ventilation equipment comprises the air bearing; or a rotor assembly as described above; or include a compressor as described above.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

FIG. 1 is a schematic structural view of an air bearing according to an embodiment of the present invention;

FIG. 2 is an enlarged view of portion I of FIG. 1 in accordance with the present invention;

fig. 3 is a schematic view of a rotor assembly according to an embodiment of the present invention.

Reference numerals:

100. an air bearing; 10. a mounting seat; 101. positioning a groove; 103. positioning pins; 20. a bump foil; 21. a first bump foil; 22. A second bump foil; 301. a top foil; 302. a first foil segment; 303. a second foil segment;

200. a rotor assembly; 11. a rotor; 12b, radial air bearing; 12a, axial air bearing.

Detailed Description

China is the biggest world refrigeration product production, consumption and export country, and the refrigeration energy consumption accounts for 15% of the total social energy consumption. During the peak period in summer, the increase of the refrigeration load of an air conditioner and the like not only brings heavy burden to a power grid, but also generates a large amount of greenhouse gas emission. Therefore, promoting green high-efficiency refrigeration has become an important and urgent need for promoting energy conservation and emission reduction and coping with climate change in various countries.

In the context of current "carbon neutralization, carbon peaking," low carbon refrigeration equipment must be developed. The core component of the refrigeration system is a refrigeration compressor, in the conventional refrigeration compressor, a lubricating medium of a sliding bearing is lubricating oil, but the lubricating medium has high viscosity, can generate high friction power consumption at high rotating speed, and in addition, the existence of the lubricating oil can influence the heat exchange effect of a heat exchanger after long-term use, so that the performance of the refrigeration system is reduced. The magnetic suspension bearing has the advantages of low friction loss and good stability, but the cost is higher, and the advantages are not obvious in the application of small and medium-sized compressors. The dynamic pressure air bearing has the advantages of high rotating speed, high efficiency and low friction loss, and is very suitable for small and medium-sized compressors.

Referring to fig. 1, the utility model discloses an air bearing 100 can include top foil 301 and mount pad 10, top foil 301 and mount pad 10 correspond with two parts that are rotatable relatively respectively, when taking place relative rotation between these two parts, can produce the effect of air suspension, thereby reduce the resistance of rotating the in-process, for example, fix with mount pad 10, top foil 301 is fixed with the pivot, when the pivot takes place high-speed rotation, the air current enters into between pivot and the top foil 301, simultaneously because wave foil 20 has certain elastic support power and elastic deformation's ability, can maintain the stable cooperation of top foil 301 with the pivot, and utilize the effect of air suspension to reduce the frictional force between pivot and the top foil 301, thereby maintain the stable rotation of pivot. Referring to fig. 3, the air bearing 100 of the present invention includes an axial air bearing 12a and a radial air bearing 12b, the axial air bearing 12a may be disposed at an end portion of the rotating shaft, and the top foil 301 and the mounting seat 10 may be disposed along an axial direction of the rotating shaft to limit an axial displacement of the rotating shaft; the radial air bearing 12b may be sleeved on the rotating shaft, and the top foil 301 and the mounting seat 10 may be arranged along a radial direction of the rotating shaft to limit a radial displacement of the rotating shaft.

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

In one aspect of the present invention, an air bearing 100 is provided. According to an embodiment of the present invention, referring to fig. 1 and 2, the air bearing 100 includes: a mount 10, a bump foil 20 and a top foil assembly.

The mount 10, the bump foil 20 and the top foil assembly are stacked in sequence, the top foil assembly comprising one or more top foils 301 stacked, the top foil assembly having a first foil section 302 and a second foil section 303, the first foil section 302 and the second foil section 303 having different thicknesses.

It is to be understood that the top foil assembly in the air bearing 100 may employ one top foil 301, or may employ a plurality of stacked top foils 301, and the use of a plurality of top foils 301 may improve the overall rigidity of the top foil assembly, which may be selected by one skilled in the art according to actual needs. Meanwhile, the first foil section 302 and the second foil section 303 in the top foil assembly have different thicknesses and are matched to provide bearing capacity, so that the situation that local pressure is small can be avoided, and the deformation of the top foil assembly is prevented from being too large, so that local radial load is balanced, the bearing performance of the air bearing 100 is improved, and the stability is improved. The material of the bump foil 20 in the present invention is not particularly limited, and may be a foil of beryllium bronze, nickel-based alloy, high-strength stainless steel, or the like. Further, a specific method of manufacturing the bump foil 20 is as follows: the method comprises the steps of performing line cutting or laser cutting on a strip-shaped foil to perform axial segmentation, dividing the middle of the foil into a plurality of segments during line cutting, wherein the foils on two sides are wide, the foils in the middle are narrow, one segment is left at each of two ends of the foil and is not cut, integrity of the foil is guaranteed, the foil is convenient to install after subsequent forming, pressing the linearly-cut foils into the wave foils 20, and the wave foils 20 can have arch wave structures or wave structures. Meanwhile, the specific material of the top foil 301 is not particularly limited, and may be beryllium bronze, nickel-based alloy, high-strength stainless steel and other foils, wherein the inner wall of the top foil 301 is sprayed with a wear-resistant self-lubricating material, which may be molybdenum disulfide, polytetrafluoroethylene, PM304, PS304 and the like.

The embodiment of the utility model provides an air bearing 100 can be axial air bearing 12a or radial air bearing 12b to axial air bearing 12a is the example, and mount pad 10, ripples foil 20 and top foil 301 are along the axial range upon range of arrangement. Taking the radial air bearing 12b as an example, the mounting seat 10, the bump foil 20 and the top foil 301 are sleeved from outside to inside along the radial direction, and in the use process of the radial air bearing 12b, the rotating shaft can be sleeved inside the top foil 301, and in the rotating process of the rotating shaft, the top foil 301 is forced to displace toward the mounting seat 10, so that an air film is formed between the rotating shaft and the top foil 301, and by utilizing the supporting function of the bump foil 20, the dynamic balance of the air film between the rotating shaft and the top foil 301 can be realized, thereby improving the stability of the rotating shaft in the rotating process. In addition, by offsetting the corrugated sections of the first corrugated foil 21 and the second corrugated foil 22, the uniformity and stability of the support of the first corrugated foil 21 and the second corrugated foil 22 to the top foil 301 can be improved, thereby improving the load capacity of the air bearing 100.

It should be noted that the present invention describesbase:Sub>A first directionbase:Sub>A-base:Sub>A,base:Sub>A second direction B-B, andbase:Sub>A third direction (referring to the direction perpendicular to the paper surface in fig. 1), wherein the first direction in the present invention refers to the direction from the mounting seat 10 to the top foil 301, the second direction refers to the circumferential direction of the air bearing 100, and the third direction refers to the direction perpendicular to the first direction and the second direction. Taking a radial bearing as an example, the first direction may be a radial direction of the air bearing 100, the second direction may be a circumferential direction of the air bearing 100, and the third direction may be an axial direction of the air bearing 100. Taking the axial air bearing 12a as an example, the first direction may be an axial direction of the air bearing 100, the second direction may be a circumferential direction of the air bearing 100, and the third direction may be a radial direction of the air bearing 100.

In some embodiments, referring to fig. 1, the first foil segment 302 and the second foil segment 303 are located on the same top foil 301, and the first foil segment 302 and the second foil segment 303 are arranged along the circumferential direction of the air bearing 100, so that when the rotating shaft is operated, the first foil segment 302 and the second foil segment 303 with different thicknesses can better balance the locally generated load force and improve the uniformity of the air film.

In some embodiments, referring to FIG. 1, the first foil segments 302 and/or the second foil segments 303 comprise a plurality, and the first foil segments 302 and the second foil segments 303 are staggered in the circumferential direction of the air bearing 100, so as to further balance the local load and thereby improve the bearing capacity of the air bearing 100.

Specifically, there may be a plurality of first foil segments 302, a plurality of second foil segments 303, or a plurality of first foil segments 302 and second foil segments 303 at the same time, which may be selected according to actual needs. For example, when there are two first foil segments 302 and two second foil segments 303, the first foil segments 302, the second foil segments 303, the first foil segments 302, and the second foil segments 303 are arranged in this order along the circumferential direction of the air bearing 100.

In some embodiments, referring to FIG. 1, the thickness of the top foil 301 varies uniformly along the circumference of the air bearing 100. That is, the thickness of the top foil 301 may be uniformly increased or decreased, so that the air bearing 100 may adapt to external acting forces of different sizes, and the pressure resistance of the air bearing 100 may be improved.

In another embodiment of the present invention, the first foil section 302 and the second foil section 303 are located on the same top foil 301, the first foil section 302 and the second foil section 303 are arranged in a horizontal direction, and both the horizontal direction and the circumferential direction of the air bearing 100 and the direction from the mounting seat 10 to the top foil 301 have an included angle greater than 0 ° and less than or equal to 90 °, for example, the horizontal direction can be the aforementioned third direction, so that the air flow can be smoothly and orderly connected and transited between one side of the first foil section 302 close to the rotating shaft and one side of the second foil section 303 close to the rotating shaft, thereby preventing the air flow from being too large, and further improving the stability of the air bearing 100.

In some embodiments, the first foil segments 302 and/or the second foil segments 303 include a plurality, and the first foil segments 302 and the second foil segments 303 are staggered in the cross direction. That is, there may be a plurality of first foil segments 302, a plurality of second foil segments 303, or a plurality of first foil segments 302 and second foil segments 303 at the same time, and they are selected according to actual needs. For example, when there are two first foil segments 302 and two second foil segments 303, the first foil segments 302, the second foil segments 303, the first foil segments 302, and the second foil segments 303 are staggered in the transverse direction of the air bearing 100.

In some embodiments, the thickness of the top foil 301 varies uniformly in the lateral direction. That is, the thickness of the top foil 301 may be uniformly increased or decreased in the transverse direction, so that the adaptability of the air bearing 100 to external loads is improved.

In some embodiments, the top foil assembly comprises a stack of multiple top foils 301, with the first foil segments 302 and the second foil segments 303 being provided on different top foils 301, respectively. That is, the air bearing 100 has the plurality of top foils 301, so that the rigidity is significantly enhanced. For example, the top foil assembly comprises two laminated top foils 301, the first foil segment 302 being provided on one of the top foils 301, and the second foil segment 303 being provided on the other top foil 301.

The utility model discloses a multilayer top foil 301 (for example double-deck), improve top foil 301's rigidity, reduce top foil 301 at the difference of radial deflection (the deflection of tradition top foil 301 between two wave heights is big, and is outwards sunken easily), traditional single-layer top foil 301 scheme leads to the clearance grow between top foil 301 between two wave heights and rotor 11, influences wedge extrusion effect, leads to partial pressure less, and whole bearing capacity is low, the utility model provides a this problem has effectively been solved to multilayer top foil 301, thereby has improved the holistic bearing capacity of foil through reducing top foil 301 difference between crest and trough position deflection. According to the scheme, the friction area between the pieces is multiplied by increasing the number of the foil pieces, so that the friction damping of the air bearing is greatly improved, and the stability of the bearing is improved.

In some embodiments, the first foil segment 302 and the second foil segment 303 are stacked in a direction from the mounting seat 10 to the top foil assembly, thereby effectively improving the stability of the entire air bearing 100 when operating in cooperation with a rotating shaft.

In some embodiments, referring to FIG. 1, one end of the top foil 301 is connected to the mounting seat 10 and extends along the circumferential direction of the air bearing 100, and the thickness of the top foil 301 varies uniformly along the circumferential direction of the air bearing 100. By fixing one end of the top foil 301 to the mounting seat 10 and extending along the circumferential direction of the air bearing 100, the top foil 301 and the bump foil 20 can be effectively matched to form a relatively effective bearing function for the rotating shaft. The other end of the top foil 301 is free, i.e. free to move, so that the top foil 301 has a certain deformability, better accommodating the movement of the rotating shaft. Meanwhile, the thickness of the top foil 301 is uniformly changed along the circumferential direction of the air bearing 100, so that the air bearing 100 has uniform bearing capacity in the radial direction, thereby improving the bearing performance and stability of the air bearing 100.

Optionally, referring to fig. 1, a positioning groove 101 is disposed on an inner side surface of the mounting base 10, the inner side surface of the mounting base 10 is a surface of the mounting base 10 opposite to the top foil 301, and an end portion of the bump foil 20 is inserted into the positioning groove 101. The positioning groove 101 enables the bump foil 20 to be stably attached to the mounting base 10, and the stability of the bump foil 20 is effectively improved.

Additionally, the utility model discloses in can also set up constant head tank 101 and fix a position top paper tinsel 301, likewise, can set up the connection piece that extends towards mount pad 10 along the first direction in the one end of top paper tinsel 301, peg graft the constant head tank 101 through the connection piece in, realize the installation to top paper tinsel 301.

In some embodiments, one end of the bump foil 20 can be fixed on the mounting base 10 through the positioning groove 101 and the positioning pin 103, one top foil 301 and the bump foil 20 are installed in opposite directions, two top foils 301 are installed in opposite directions, and one end of the top foil 301 is fixed on the mounting base 10 through the matching of the positioning groove 101 and the positioning pin 103, so that the fixing mode can ensure the attaching degree of the bump foil 20 on the inner wall of the mounting base 10, and the influence on the performance and the service life of the bearing due to the poor attaching of the foils can be avoided.

An embodiment of the air bearing 100 of the present invention will be described with reference to the drawings.

As shown in fig. 1, 2 and 3, the air bearing 100 includes: a mount 10, a bump foil 20 and a top foil assembly.

The mount 10, the bump foil 20 and the top foil assembly are stacked in sequence, the top foil assembly comprising a top foil 301 having a first foil section 302 and a second foil section 303, the first foil section 302 and the second foil section 303 having different thicknesses.

The first foil segments 302 and the second foil segments 303 are located on the same top foil 301, and the first foil segments 302 and the second foil segments 303 are arranged along the circumferential direction of the air bearing 100. The first foil segments 302 include 2 foil segments, the second foil segments 303 include 1 foil segment, and the first foil segments 302 and the second foil segments 303 are staggered in the circumferential direction of the air bearing 100.

The thickness of the top foil 301 varies uniformly along the circumferential direction of the air bearing 100.

One end of the top foil 301 is connected to the mount 10 and extends in the circumferential direction of the air bearing 100, and the thickness of the top foil 301 varies uniformly in the circumferential direction of the air bearing 100. The air bearing 100 is a radial air bearing 12b.

According to the utility model discloses a rotor assembly 200, rotor assembly 200 includes rotor 11, and rotor assembly 200 still includes: the radial air bearing 12b, the radial air bearing 12b is sleeved on the periphery of the rotor 11, the radial air bearing 12b is the air bearing 100, and the mounting seat 10, the bump foil 20 and the top foil 301 of the radial air bearing 12b are sequentially stacked from outside to inside along the radial direction of the rotor 11. By providing the air bearing 100, the stability of the rotor assembly 200 during operation can be improved, and the damping of the rotor 11 during rotation can be reduced. The rotor assembly 200 may include a radial air bearing 12b, the radial air bearing 12b is sleeved on the periphery of the rotor 11, the radial air bearing 12b is the air bearing 100 according to the foregoing embodiment, and the mounting seat 10, the bump foil 20 and the top foil 301 of the radial air bearing 12b are sequentially stacked from outside to inside along the radial direction of the rotor 11. During use, during rotation of the rotor assembly 200, the top foil 301 is pushed to move towards the mounting seat 10, and a gas film is formed on the surface of the top foil 301, while the top foil 301 is forced to expand outward and press against the wave foil 20, and the wave foil 20 provides a support for the top foil 301, so that the wave foil 20 and the rotation shaft have a proper distance therebetween, so as to maintain the stability of the gas film between the top foil 301 and the rotation shaft. Meanwhile, the stable rotation of the rotor 11 can be maintained, and the radial play of the rotor 11 is reduced. In addition, the rotor assembly 200 may further include an axial air bearing 12a, the axial air bearing 12a is engaged with the rotor 11, the axial air bearing 12a is the air bearing 100 according to the foregoing embodiment, and the mounting seat 10, the bump foil 20 and the top foil 301 of the axial air bearing 12a are sequentially stacked in the axial direction of the rotor 11. During use, during rotation of the rotor assembly 200, the top foil 301 is pushed to move towards the mounting seat 10, and a gas film is formed on the surface of the top foil 301, the top foil 301 presses against the wave foil 20, and the wave foil 20 provides a support for the top foil 301, so that the wave foil 20 and the rotation shaft have a proper distance therebetween, so as to maintain the stability of the gas film between the top foil 301 and the rotation shaft.

According to the embodiment of the present invention, a compressor includes the above-mentioned rotor assembly 200. Therefore, the running stability of the compressor is high, and the refrigerating performance is improved.

According to the utility model discloses warm equipment of ventilating of embodiment, including foretell compressor.

The utility model provides an air bearing 100 and this air bearing 100's rotor assembly 200, compressor and warm logical equipment, the first paper tinsel section 302 that has in the top paper tinsel subassembly is different with the thickness of second paper tinsel section 303, both cooperations provide the bearing capacity, then can avoid local pressure less, prevent simultaneously that the deformation volume of top paper tinsel subassembly is too big to balanced local radial load, air bearing 100's bearing performance increases, and stability can improve.

The embodiment of the utility model provides an air bearing 100 can be axial air bearing 12a or radial air bearing 12b to axial air bearing 12a is the example, and mount pad 10, ripples foil 20 and top foil 301 are along the axial range upon range of arrangement. Taking the radial air bearing 12b as an example, the mounting seat 10, the wave foil 20 and the top foil 301 are sleeved from outside to inside along the radial direction, during the use of the radial air bearing 12b, the rotating shaft can be sleeved inside the top foil 301, during the rotation of the rotating shaft, the top foil 301 is forced to displace towards the mounting seat 10, and an air film is formed between the rotating shaft and the top foil 301, and by utilizing the supporting function of the wave foil 20, the dynamic balance of the air film between the rotating shaft and the top foil 301 can be realized, thereby improving the stability of the rotating shaft during the rotation. In addition, by offsetting the first corrugated section and the second corrugated section, the uniformity and stability of the first corrugated foil 21 and the second corrugated foil 22 for supporting the top foil 301 can be improved, so that the load capacity of the air bearing is improved.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the present application, unless expressly stated or limited otherwise, a first feature "on" or "under" a second feature may be directly contacting the second feature or the first and second features may be indirectly contacting the second feature through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

While embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the present invention.

Claims (14)

1. An air bearing comprising a mount, a bump foil and a top foil assembly stacked in sequence, the top foil assembly comprising one or more top foils stacked, the top foil assembly having a first foil section and a second foil section, the first foil section and the second foil section having different thicknesses.

2. The airfoil bearing of claim 1, wherein the first foil segment and the second foil segment are located on a same top foil, the first foil segment and the second foil segment being arranged along a circumferential direction of the airfoil bearing.

3. The airfoil bearing as recited in claim 2, wherein the first foil segment and/or the second foil segment includes a plurality and the first foil segment and the second foil segment are staggered in a circumferential direction of the airfoil bearing.

4. The air bearing of claim 2, wherein the thickness of the top foil varies uniformly along a circumferential direction of the air bearing.

5. The airfoil bearing of claim 1, wherein the first and second foil segments are disposed on a common top foil, the first and second foil segments being arranged in a transverse direction having an angle greater than 0 ° and less than or equal to 90 ° with respect to a circumferential direction of the airfoil bearing and a direction from the mount to the top foil.

6. The airfoil bearing of claim 5, wherein the first foil segment and/or the second foil segment comprises a plurality and the first foil segment and the second foil segment are staggered in the cross direction.

7. The air bearing of claim 5, wherein the thickness of the top foil varies uniformly in the transverse direction.

8. The air bearing of any of claims 1-7, wherein the top foil assembly comprises a stack of top foils, the first and second foil sections being provided on different top foils, respectively.

9. The air bearing of claim 8, wherein the first foil segment and the second foil segment are stacked in a direction from the mount to the top foil assembly.

10. The air bearing of any of claims 1-7, wherein the top foil is coupled to the mounting block at one end and extends in a circumferential direction of the air bearing, and wherein a thickness of the top foil varies uniformly in the circumferential direction of the air bearing.

11. The air bearing as recited in any one of claims 1 to 7, wherein the air bearing is a radial air bearing or an axial air bearing.

12. A rotor assembly, the rotor assembly comprising a rotor, the rotor assembly further comprising:

the radial air bearing is sleeved on the periphery of the rotor, the radial air bearing is the air bearing according to any one of claims 1 to 10, and the mounting seat, the bump foil and the top foil of the radial air bearing are sequentially laminated from outside to inside along the radial direction of the rotor; and/or

An axial air bearing cooperating with the rotor, the axial air bearing being as claimed in any one of claims 1 to 10, the mount, the bump foil and the top foil of the axial air bearing being stacked in sequence in an axial direction of the rotor.

13. A compressor, characterized by comprising an air bearing according to any one of claims 1 to 11; or comprising a rotor assembly according to claim 12.

14. Heating and ventilation device, characterized in that it comprises an air bearing according to any one of claims 1 to 11; or comprising a rotor assembly according to claim 12; or comprising a compressor according to claim 13.

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