Gas thrust bearing, compressor and air conditioning system

Abstract

The present application relates to a kind of gas thrust bearing, compressor and air conditioning system, gas thrust bearing includes: bearing seat (1);Smooth foil (3), with the bearing seat (1) along the axial superposition of the gas thrust bearing, the end of the bearing seat (1) along the circumferential of the gas thrust bearing is the fixed end connected with the bearing seat (1), the other end is the free end separated from the bearing seat (1);Wave foil (2), with the bearing seat (1) and the smooth foil (3) along the axial superposition, the wave foil (2) includes multiple wave structures arranged along first direction, the wave foil (2) is arranged between the smooth foil (3) and the bearing seat (1);And thermal deformation piece (8), with the smooth foil (3) and the wave foil (2) along the axial superposition and with the wave foil (2) connection, and be configured to stretch the wave foil (2) along the first direction due to temperature rise.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioning, in particular to a gas thrust bearing, a compressor and an air conditioning system. BACKGROUND

[0002] A centrifugal compressor is a kind of high-speed rotating machinery, and commonly used bearings include rolling bearings, sliding bearings, magnetic suspension bearings and the like. However, with the development of the industry of miniaturization, high-speed and oil-free of the centrifugal compressor, higher requirements are put forward for the high-temperature resistance of the bearings under high-speed conditions, and the gas suspension bearing emerges as the times require. The wave foil type dynamic pressure gas thrust bearing is a kind of gas bearing, which mainly provides axial stiffness and damping for the rotor system.

[0003] The typical structure of the wave foil type dynamic pressure gas thrust bearing is shown in Figure 1 The gas thrust bearing mainly consists of a bearing shell 1, a wave foil 2 and a smooth foil 3, and the working medium of the gas thrust bearing is gas, such as air or refrigerant gas. Similar to the pad of the oil-lubricated thrust bearing, the smooth foil of the wave foil type dynamic pressure gas thrust bearing is generally designed in a fan shape to act as a pad, and the smooth foils are uniformly distributed in the circumferential direction in order to be uniformly stressed. The wave foil 2 under the smooth foil 3 has a special corrugated structure and plays a role of elastic support, which is the main source of the stiffness and damping of the thrust bearing. The wave foil 2 and the smooth foil 3 are fixed at one end of the bearing shell 1. The other end is free, and the front end of the smooth foil 3 and the thrust disc of the rotor form a convergent angle, forming a wedge-shaped area 6, and the size of the convergent angle is also called the wedge degree. The wave foil 2 and the smooth foil 3 are provided with a welding point 4 for connecting the wave foil 2 and the smooth foil 3 with the bearing shell 1 along one end in the circumferential direction. The rear end of the smooth foil 3 is parallel to the thrust disc 5, and the distance therebetween is the bearing gap, and the area is the load-carrying area. When the rotor rotates at high speed, the gas is quickly converged and the pressure is raised in the wedge-shaped area under the action of the above-mentioned convergent angle through the dynamic pressure effect, so that a high-pressure gas film can be formed in the load-carrying area to support the rotor.

[0004] Compared with lubricating oil, the viscosity of air or refrigerant gas is relatively low, so in order to obtain a larger bearing carrying capacity, the working speed of the gas bearing is relatively high (generally greater than 15000 rpm, and the working speed of small bearings even reaches hundreds of thousands of rpm). The heat generation of the bearing is proportional to the speed, and the high working speed brings the problem of large heat generation of the bearing, which is easy to cause failure. SUMMARY

[0005] The present application aims to provide a gas thrust bearing, a compressor and an air conditioning system to improve the problem that the gas thrust bearing in the prior art is easy to fail under high-speed working conditions.

[0006] According to an aspect of some embodiments of the present application, there is provided a gas thrust bearing, the gas thrust bearing comprising:

[0007] a bearing seat;

[0008] a smooth foil stacked with the bearing seat along an axial direction of the gas thrust bearing, the smooth foil having a fixed end connected with the bearing seat and a free end separated from the bearing seat along a circumferential direction of the gas thrust bearing;

[0009] a wave foil stacked with the bearing seat and the smooth foil along the axial direction, the wave foil comprising a plurality of wave structures arranged along a first direction, the wave foil being disposed between the smooth foil and the bearing seat, the first direction intersecting a radial direction of the gas thrust bearing; or, the first direction being consistent with a circumferential direction of the gas thrust bearing; and

[0010] a thermal deformation member stacked with the smooth foil and the wave foil along the axial direction and connected with the wave foil, the thermal deformation member being configured to stretch the wave foil along the first direction due to a temperature rise.

[0011] In some embodiments, two ends of the thermal deformation member along the circumferential direction are connected with two ends of the wave foil along the circumferential direction, respectively.

[0012] In some embodiments, one end of the thermal deformation member along the circumferential direction adjacent to the fixed end of the smooth foil is connected with the bearing seat and the wave foil, and the other end of the thermal deformation member away from the fixed end of the smooth foil is connected with the wave foil and separated from the bearing seat.

[0013] In some embodiments, the thermal deformation member is located between the wave foil and the bearing seat.

[0014] In some embodiments,

[0015] the smooth foil comprises a first smooth foil and a second smooth foil arranged along the circumferential direction sequentially and connected with the first smooth foil, one end of the first smooth foil along the circumferential direction away from the second smooth foil being the fixed end, a distance between the first smooth foil and the bearing seat increasing along a direction from the fixed end to the second smooth foil;

[0016] the wave foil comprises a first wave foil located between the first smooth foil and the bearing seat and a second wave foil located between the second smooth foil and the bearing seat.

[0017] In some embodiments, two ends of the thermal deformation member along the circumferential direction are connected with two ends of the second wave foil along the circumferential direction, respectively.

[0018] In some embodiments, the first wave foil and the second wave foil are separated, the first wave foil being separated from the thermal deformation member

[0019] In some embodiments, one end of the thermal deformation member along the circumferential direction close to the fixed end is connected with the second wave foil and the bearing seat.

[0020] In some embodiments, the thermal deformation member comprises a sheet-shaped component stacked axially with the wave foil and the bearing seat.

[0021] In some embodiments, the gas thrust bearing further comprises a thrust disc stacked axially with the smooth foil and located on a side of the smooth foil away from the wave foil, and a bearing gap is formed between the thrust disc and the smooth foil.

[0022] In some embodiments, the thermal deformation member has a linear expansion coefficient 2 to 3 times that of the wave foil.

[0023] In some embodiments, the thermal deformation member is made of one of stainless steel, copper, zinc, lead, silver and aluminum.

[0024] According to another aspect of the present application, a compressor is also provided, which comprises the above-mentioned gas thrust bearing.

[0025] According to another aspect of the present application, an air conditioning system is also provided, which comprises the above-mentioned gas thrust bearing or the above-mentioned compressor.

[0026] By applying the technical solution of the present application, when the working rotational speed of the gas thrust bearing is increased or the working environment temperature is increased, the thermal deformation member is extended by heat, which drives the wave foil to elastically creep in the first direction, thereby reducing the height of the wave foil, and further increasing the bearing gap between the smooth foil and the thrust disc. By increasing the bearing gap, the heat generation of the bearing is reduced, which is beneficial to improve the problem that the gas thrust bearing in the prior art is prone to failure under high-speed working conditions.

[0027] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Figure 1 A structural schematic diagram of a gas thrust bearing of the related art is shown;

[0030] Figure 2 A cross-sectional structural schematic diagram of the related art is shown at B in Figure 1

[0031] Figure 3 A structural schematic diagram of a gas thrust bearing and a rotor of an embodiment of the present application is shown;​

[0032] Figure 4 a cross-sectional structural schematic view of the embodiment of the application is shown; Figure 3

[0033] Figure 5 a cross-sectional structural schematic view of the embodiment of the application is shown; Figure 3

[0034] Figure 6 a partial enlarged view of C in FIG. 8 is shown; Figure 4

[0035] Figure 7 a layout schematic view of a smooth foil of the gas thrust bearing of the embodiment of the application is shown;

[0036] Figure 8 a layout schematic view of a wave foil of the gas thrust bearing of the embodiment of the application is shown;

[0037] Figure 9 a partial enlarged view of D in FIG. 9 is shown; Figure 8

[0038] Figure 10 a layout schematic view of a thermal deformation piece of the gas thrust bearing of the embodiment of the application is shown;

[0039] Figure 11 a structural schematic view of the thermal deformation piece and the wave foil of the gas thrust bearing of the embodiment of the application is shown;

[0040] Figure 12 a structural schematic view of the wave foil of the gas thrust bearing of the embodiment of the application is shown; and

[0041] Figure 13 a structural schematic view of the thermal deformation piece of the gas thrust bearing of the embodiment of the application is shown. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the application will be apparently and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the application of the application or use of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without any creative work, belong to the protection scope of the application.

[0043] ​​​​Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0044] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0045] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0046] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0047] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0048] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0049] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be direct connection, can also be indirect connection through an intermediate medium, can be internal communication of two elements or interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] In combination Figures 3 to 6 As shown in the drawings, the gas thrust bearing in the embodiment includes a bearing seat 1, a smooth foil 3, a wave foil 2 and a thermal deformation piece 8.

[0051] The smooth foil 3 is stacked with the bearing seat 1 along the axial direction of the gas thrust bearing, and one end of the smooth foil 3 along the circumferential direction of the gas thrust bearing is a fixed end connected with the bearing seat 1, and the other end is a free end separated from the bearing seat 1.

[0052] The wave foil 2 is stacked with the bearing seat 1 and the smooth foil 3 along the axial direction, and the wave foil 2 includes a plurality of wave structures arranged along a first direction, and the wave foil 2 is arranged between the smooth foil 3 and the bearing seat 1.

[0053] The thermal deformation piece 8 is stacked with the smooth foil 3 and the wave foil 2 along the axial direction and is connected with the wave foil 2, and is configured to stretch the wave foil 2 along the first direction due to heating.

[0054] When the working speed of the gas thrust bearing increases or the working environment temperature rises, the elastic creep of the wave foil 2 along the first direction is driven by the thermal extension of the thermal deformation piece 8, so as to reduce the height H2 of the wave foil 2, and further increase the bearing gap H1 between the smooth foil 3 and the thrust disc 5. By increasing the bearing gap H1, the heat generation of the bearing is reduced, which is beneficial to improve the problem that the gas thrust bearing in the prior art is prone to failure under high speed working condition.

[0055] Further, when the working speed of the gas thrust bearing decreases or the working environment temperature decreases, the elastic creep of the wave foil along the first direction driven by the thermal extension of the thermal deformation piece 8 becomes smaller, the height H2 of the wave foil becomes larger, and the bearing gap becomes smaller.

[0056] As can be seen, the bearing gap H1 of the gas thrust bearing of the embodiment can be adaptively adjusted according to the change of temperature to ensure that the gas thrust bearing operates effectively, and the gas thrust bearing of the embodiment can be applied to working conditions with high speed or high temperature.

[0057] The aforementioned first direction intersects the radial direction of the gas thrust bearing; in some embodiments, the first direction coincides with the circumferential direction of the gas thrust bearing, and the two ends of the heat-deformable member 8 along the circumferential direction are respectively connected to the corrugated foil 2. When the rotational speed or temperature of the gas thrust bearing increases, the heat-deformable member 8 stretches the corrugated foil 2 circumferentially, thereby reducing the height H2 of the corrugated foil 2 and increasing the bearing clearance H1; when the rotational speed or temperature of the gas thrust bearing decreases, the heat-deformable member 8 retracts circumferentially, the height H2 of the corrugated foil 2 increases, and the corresponding bearing clearance H1 decreases.

[0058] In some embodiments, one end of the heat-deformable member 8, adjacent to the fixed end of the smooth foil 3 along the circumferential direction, is connected to the bearing housing 1 and the corrugated foil 2, while the other end of the heat-deformable member 8, away from the fixed end of the smooth foil 3, is connected to the corrugated foil 2 and separated from the bearing housing 1. When the rotational speed or temperature of the gas thrust bearing increases, the end of the heat-deformable member 8 separated from the bearing housing 1 extends away from the end connected to the bearing housing 1. When the rotational speed or temperature of the gas thrust bearing decreases, the end of the heat-deformable member 8 separated from the bearing housing 1 retracts towards the end connected to the bearing housing 1.

[0059] In some embodiments, the heat-deformable element 8 is located between the corrugated foil 2 and the bearing housing 1. During bearing operation, the bearing gap H1 between the smooth foil 3 and the thrust disk 5 is filled with gas. This gas applies a certain pressure to the smooth foil 3. This pressure, through the corrugated foil 2, pushes the heat-deformable element 8 against the bearing housing 1. The location of the heat-deformable element 8 between the corrugated foil 2 and the bearing housing 1 helps to ensure that the heat-deformable element 8 adheres to the bearing housing 1 and stretches the corrugated foil 2 during the heat deformation process. This helps to prevent the deformation direction of the heat-deformable element 8 from deviating from the direction parallel to the bearing housing 1, thereby changing the stretching of the corrugated foil 2 and changing the height of the corrugated foil 8.

[0060] like Figure 6 As shown, the smooth foil 3 includes a first smooth foil 31 and a second smooth foil 32 arranged and connected to the first smooth foil 31 in a circumferential direction. The end of the first smooth foil 31 that is circumferentially away from the second smooth foil 32 is a fixed end. The distance between the first smooth foil 31 and the bearing seat 1 gradually increases from the fixed end to the second smooth foil 32, thereby introducing gas into the air intake part of the bearing gap H1 between the second smooth foil 32 and the thrust disk 5.

[0061] The corrugated foil 2 includes a first corrugated foil 21 located between a first smooth foil 31 and a bearing housing 1, and a second corrugated foil 22 located between a second smooth foil 32 and a bearing housing 1. The height of the first corrugated foil 21 located between the first smooth foil 31 and the bearing housing 1 gradually increases along the direction closer to the second corrugated foil 22. The first corrugated foil 21 and the second corrugated foil 22 have different shapes. Designing and manufacturing them separately is beneficial for improving production efficiency and facilitating processing and manufacturing.

[0062] In some embodiments, the two ends of the thermal deformation piece 8 along the circumference are connected with the two ends of the second wave foil 22 along the circumference respectively. The first smooth foil 31 forms a converging area with the thrust disc 5 at an angle θ, and the second smooth foil 32 is parallel to the thrust disc 5, which is a bearing area for mainly bearing the axial thrust of the thrust disc 5. When the thrust disc 5 rotates along the rotation direction A, the gas enters the bearing gap between the second smooth foil 32 and the thrust disc 5 from the converging area. Under the action of the converging area, the gas is rapidly converging and the pressure is rising in the wedge-shaped area by the dynamic pressure effect, so that a high-pressure gas film is formed in the bearing area by the dynamic pressure effect to support the rotor (mainly composed of the thrust disc 5 and the shaft 7).

[0063] The bearing gap H1 between the second smooth foil 32 and the thrust disc 5 is negatively related to the heat generation of the bearing, that is, as the bearing gap H1 decreases, the heat generation increases; as the bearing gap H1 increases, the heat generation decreases.

[0064] In the present embodiment, the two ends of the thermal deformation piece 8 along the circumference are connected with the two ends of the second wave foil 22 along the circumference respectively, so as to adjust the height of the second wave foil 22 which mainly plays a bearing role, and also adjust the height of the first wave foil 31 relative to the thermal deformation piece 8, which is beneficial to ensure the stability of the angle θ of the converging area and the stability of the gas inlet of the bearing gap.

[0065] In the present embodiment, the first wave foil 21 and the second wave foil 22 are separated. The first wave foil 21 is separated from the thermal deformation piece 8, so that the thermal deformation piece 8 only adjusts the height of the second wave foil 22.

[0066] In some embodiments, one end of the thermal deformation piece 8 along the circumference close to the fixed end of the smooth foil 3 is connected with the second wave foil 22 and the bearing seat 1. In combination with the description of the first wave foil 21, the second wave foil 22 and the bearing seat 1 are connected by the first welding point 9. Figure 8 、 9 As shown in Figs. 7, 8 and 11, one end of the second wave foil 22 close to the first wave foil 21, one end of the thermal deformation piece 8 along the circumference close to the fixed end of the smooth foil 3 and the bearing seat 1 are connected together by the first welding point 9. In some embodiments, the second wave foil 22, the thermal deformation piece 8 and the bearing seat 1 are connected together by spot welding, and the first welding point 9 is formed by spot welding.

[0067] In the working process of the gas thrust bearing, the gas enters the bearing area where the second smooth foil 32 is located from the converging area described above. In the present embodiment, the position where the gas first flows through is called the head or front part, and the position where the gas flows through later is called the tail or rear part.

[0068] That is, the head of the second wave foil 22 and the head of the thermal deformation member 8 are fixed together, and the head of the second wave foil 22 and the head of the thermal deformation member 8 are fixed relative to the bearing seat. The tail of the second wave foil 22 and the tail of the thermal deformation member 8 are connected together, and the tail of the second wave foil 22 and the tail of the thermal deformation member 8 are movable relative to the bearing seat 1, so that when the thermal deformation member 8 is extended by heating, the wave foil 2 can be elastically creeped in the first direction, thereby reducing the height of the wave foil 2, and further increasing the bearing gap H1 between the smooth foil 3 and the thrust disc 5, thereby reducing the heat generation of the bearing by increasing the bearing gap H1.

[0069] The end of the second wave foil 22 away from the first wave foil 21 is connected to the thermal deformation member 8 by a second welding spot 10. In some embodiments, the second wave foil 22 and the thermal deformation member 8 are connected by spot welding, and the second welding spot 10 is formed by spot welding.

[0070] In some embodiments, the thermal deformation member 8 includes a sheet-shaped component that is stacked in the axial direction with the wave foil 2 and the bearing seat 1, which is beneficial to increase the contact area or contact position with the wave foil 2 as a whole, and when the thermal deformation member 8 is extended by heating, the wave foil 2 is stretched as a whole to reduce the height of each position of the wave foil 2, which is beneficial to ensure the consistency of the bearing gap H1 between the smooth foil 3 and the thrust disc 5. The two ends of the thermal deformation member 8 in the circumferential direction of the gas thrust bearing are flush with the second wave foil 22. In some embodiments, the shape of the thermal deformation member 8 is consistent or substantially consistent with the shape of the second wave foil 22.

[0071] The gas thrust bearing further comprises a thrust disc 5, which is stacked in the axial direction with the smooth foil 3 and located on the side of the smooth foil 3 away from the wave foil 2, and has a gap H1 between the thrust disc 5 and the smooth foil 3. The thrust disc 5 is connected to the shaft 7, and the bearing seat 1 is a ring structure, and the shaft 7 passes through the center hole of the bearing seat 1. Figure 7 The layout of the plurality of fan-shaped smooth foils 3 in the circumferential direction is shown. Figure 8 The layout of the plurality of wave foils 2 in the circumferential direction is shown, Figure 10 The layout of the thermal deformation member 8 in the circumferential direction is shown.

[0072] The thermal deformation member 8 is extended by heating to drive the wave foil 2 to elastically creep in the first direction, thereby reducing the height of the wave foil 2, and further increasing the bearing gap H1 between the smooth foil 3 and the thrust disc 5, thereby reducing the heat generation of the bearing by increasing the bearing gap H1, which is beneficial to improve the problem of easy failure of the gas thrust bearing in the prior art under high speed working conditions.

[0073] In the present embodiment, the thermal deformation member 8, the wave foil 2, and the smooth foil 3 are arranged in sequence between the bearing seat 1 and the thrust disc 5. The thermal deformation member 8, the wave foil 2, and the smooth foil 3 are arranged one by one in correspondence.

[0074] In some embodiments, the coefficient of linear expansion of the heat-deformable member 8 is 2 to 3 times that of the corrugated foil 2, so that the heat-deformable member 8 can effectively adjust the height of the corrugated foil 2 according to temperature changes.

[0075] In some embodiments, the material of the heat-deformable part 8 is one of stainless steel, copper, zinc, lead, silver and aluminum.

[0076] In terms of material selection, the second wave foil 22 needs to provide stiffness and damping for the bearing, requiring it to have a series of requirements such as strong anti-friction and wear performance, good anti-galling performance, good machinability, and good high temperature resistance. At present, the industry mostly uses nickel-based high temperature alloys as materials. For example, one material of the second wave foil 22 is GH4149, whose coefficient of linear expansion (temperature range of 0 to 100℃) is 11.8 / (10-6C-1). The coefficient of linear expansion of the heat-deformed part 8 is required to be greater than that of the second wave foil 22. At this time, the material of the heat-deformed part 8 can be SUS304, copper, aluminum, etc. If aluminum is selected, its coefficient of linear expansion (temperature range of 0 to 100℃) is 24.3 / (10-6C-1).

[0077] Since the coefficient of linear expansion of aluminum is greater than that of GH4149 by 2.06 times, the extension length of the heat-deformed part 8 is 2.06 times that of the second wave foil 22 after being subjected to the same heating temperature.

[0078] Therefore, when the bearing's operating speed increases or the ambient temperature rises, such as Figure 9 As shown, the heat-deformable part 8 extends and lengthens in the circumferential direction due to heating. Since the first weld point 9 fixes the heat-deformable part 8, the second wave foil 22 and the bearing seat 1 together at the front position, the heat-deformable part 8 extends and lengthens in the direction of rotation toward the tail. At this time, the second wave foil 22 and the heat-deformed part 8 are fixed together by the second weld point 10. Therefore, when the heat-deformed part 8 extends and becomes longer in the direction of rotation towards the tail, it drives the second wave foil 22 to also extend and become longer in the direction of the tail. The second wave foil 22 is composed of multiple waveforms with height H2 having an elastic structure. After being subjected to circumferential extension force, the waveform height H2 of the second wave foil 22 decreases and the waveform width L increases, which increases the bearing clearance H1 and reduces the heat generated by the bearing itself. Conversely, when the bearing operating speed decreases or the operating environment temperature drops, the heat received by the heat-deformed part 8 decreases, and the extension in the circumferential direction becomes smaller or returns to 0. At this time, the elastic waveform height H2 of the second wave foil 22 increases and the waveform width L decreases, the bearing clearance H1 decreases, and it returns to the initial working state.

[0079] The bearing of the wave foil type dynamic pressure gas thrust bearing structure of the embodiment is suitable for high speed and high temperature working environment. When the working speed of the bearing increases or the working temperature of the environment increases, the elastic creep of the bearing wave foil 3 along the circumference is driven by the thermal extension of the thermal deformation piece 8 along the circumference, so as to reduce the height of the bearing wave foil 3, and then increase the bearing gap, thereby reducing the heat generation of the bearing by increasing the bearing gap; on the contrary, when the working speed of the bearing decreases or the working temperature of the environment decreases, the elastic creep of the bearing wave foil 3 along the circumference driven by the thermal extension of the thermal deformation piece 8 along the circumference is small, the height of the bearing wave foil 3 is large, and the bearing gap is small. The patent realizes the dynamic pressure gas thrust bearing technology of the bearing gap suitable for temperature change through mechanical structure.

[0080] According to another aspect of the present application, a compressor is also provided, which comprises the above gas thrust bearing.

[0081] According to another aspect of the present application, an air conditioning system is also provided, which comprises the above gas thrust bearing or the above compressor.

[0082] The above is only an exemplary embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gas thrust bearing characterized by, The gas thrust bearing comprises: a bearing seat (1); a smooth foil (3) stacked with the bearing seat (1) along an axial direction of the gas thrust bearing, one end of the smooth foil (3) along a circumferential direction of the gas thrust bearing being a fixed end connected with the bearing seat (1), and the other end being a free end separated from the bearing seat (1); a wave foil (2) stacked with the bearing seat (1) and the smooth foil (3) along the axial direction, the wave foil (2) comprising a plurality of wave structures arranged along a first direction intersecting with a radial direction of the gas thrust bearing, the wave foil (2) being arranged between the smooth foil (3) and the bearing seat (1), and the first direction being consistent with a circumferential direction of the gas thrust bearing; or the first direction being consistent with the circumferential direction of the gas thrust bearing; and a thermal deformation member (8) stacked with the smooth foil (3) and the wave foil (2) along the axial direction and connected with the wave foil (2), and configured to stretch the wave foil (2) along the first direction due to temperature rise. Two ends of the thermal deformation member (8) along the circumferential direction are respectively connected with two ends of the wave foil (2) along the circumferential direction.

2. The gas thrust bearing of claim 1, wherein, One end of the thermal deformation member (8) along the circumferential direction adjacent to the fixed end of the smooth foil (3) is connected with the bearing seat (1) and the wave foil (2), and the other end of the thermal deformation member (8) away from the fixed end of the smooth foil (3) is connected with the wave foil (2) and separated from the bearing seat (1).

3. The gas thrust bearing of claim 1 or 2, wherein The thermal deformation member (8) is located between the wave foil (2) and the bearing seat (1).

4. The gas thrust bearing of claim 1, wherein, 5. The gas thrust bearing according to claim 1, wherein the smooth foil (3) comprises a first smooth foil (31) and a second smooth foil (32) arranged in sequence along the circumferential direction and connected with the first smooth foil (31), one end of the first smooth foil (31) along the circumferential direction away from the second smooth foil (32) being the fixed end, and a distance between the first smooth foil (31) and the bearing seat (1) gradually increasing along a direction from the fixed end to the second smooth foil (32); the wave foil (2) comprises a first wave foil (21) located between the first smooth foil (31) and the bearing seat (1), and a second wave foil (22) located between the second smooth foil (32) and the bearing seat (1). Two ends of the thermal deformation member (8) along the circumferential direction are respectively connected with two ends of the second wave foil (22) along the circumferential direction.

6. The gas thrust bearing of claim 5, wherein, The first wave foil (21) and the second wave foil (22) are separated, and the first wave foil (21) is separated from the thermal deformation member (8).

7. The gas thrust bearing of claim 5, wherein, One end of the thermal deformation member (8) along the circumferential direction close to the fixed end is connected with the second wave foil (22) and the bearing seat (1).

8. The gas thrust bearing of claim 6, wherein, The thermal deformation member (8) comprises a sheet-shaped component stacked with the wave foil (2) and the bearing seat (1) along the axial direction.

9. The gas thrust bearing of claim 1, wherein, ​ 10. The gas thrust bearing of claim 1, wherein, A thrust disc (5) is further included, which is stacked with the smooth foil (3) along the axial direction and located on the side of the smooth foil (3) away from the wave foil (2), and a bearing gap (H1) is formed between the thrust disc (5) and the smooth foil (3).

11. The gas thrust bearing of claim 1, wherein, The linear expansion coefficient of the thermal deformation member (8) is 2 to 3 times that of the wave foil (2).

12. The gas thrust bearing of claim 1, wherein, The material of the thermal deformation member (8) is one of stainless steel, copper, zinc, lead, silver and aluminum.

13. A compressor characterized by, A gas thrust bearing according to any one of claims 1 to 12.

14. An air conditioning system, characterised in that, A compressor according to claim 13.

Images