Static gas radial bearings, compressors and air conditioning equipment

Abstract

The present invention relates to a static pressure gas radial bearing, a compressor and an air conditioning device, wherein the static pressure gas radial bearing comprises: a bearing base (1), comprising an annular seat body (11), the center of the annular seat body (11) having a first through hole (111); a porous layer (4), which is annular in structure and coaxially arranged in the first through hole (111); a first foil (2), which is coaxially sleeved outside the annular seat body (11), and a cavity (Q) is provided between the first foil (2) and the outer wall of the annular seat body (11); and a second foil (3), which is elastic, coaxially sleeved outside the annular seat body (11) and at least partially located in the cavity (Q), and the second foil (3) is pressed against the annular seat body (11) through the first foil (2). Such a radial bearing can adaptively adjust its load-bearing capacity according to the change of load.

Description

Technical Field

[0001] The present disclosure relates to the technical field of bearings, and in particular to a static pressure gas radial bearing, a compressor and an air conditioning device. Background Art

[0002] A centrifugal compressor is an air-conditioning compressor that uses high-speed impeller rotation to generate centrifugal force to compress gas. Currently, commonly used centrifugal compressors include fixed-frequency, variable-frequency, magnetically suspended, and air-suspended centrifugal compressors. Among them, air-suspended centrifugal compressors have become the future development trend of centrifugal compressors due to their simple structure, oil-free, friction-free, and low cost.

[0003] A centrifugal compressor is a device that compresses refrigerant. It mainly includes a pneumatic system, a transmission system, etc. The rotor is supported by a gas radial bearing to balance the radial force on the rotor. When the rotor is at different speeds, the radial force it is subjected to also changes. And for rotating machinery, due to the variable operating state of the moving parts, the load it bears also changes accordingly, so the load on the bearing is also complex and variable.

[0004] It is currently found during the use of compressors that when the compressor is in different operating conditions, the bearing capacity of the gas radial bearing is difficult to adapt to the requirements of the rotor under changing loads. Summary of the invention

[0005] The present disclosure provides a static pressure gas radial bearing, a compressor and an air conditioning device, which can enable the radial bearing to adaptively adjust its load-bearing capacity.

[0006] In one aspect, an embodiment of the present disclosure provides a static pressure gas radial bearing, comprising:

[0007] The bearing base comprises an annular seat body, the center of which has a first through hole;

[0008] The porous layer has an annular structure and is coaxially disposed in the first through hole;

[0009] A first foil is coaxially sleeved on the outside of the annular seat body, and a cavity is defined between the first foil and the outer wall of the annular seat body; and

[0010] The second foil is elastic and is coaxially sleeved outside the annular seat body and at least partially located in the cavity. The second foil is pressed against the annular seat body through the first foil.

[0011] In some embodiments, the portion of the second foil located in the cavity includes: a plurality of bent portions and a plurality of connecting portions, each bent portion and each connecting portion is alternately arranged in the circumferential direction, the bent portion extends axially, and the bent portion protrudes as a whole radially toward one side of the connecting portion, and the protruding direction of each bent portion is consistent.

[0012] In some embodiments, two positioning grooves are provided on the outer side wall of the annular seat body at intervals along the circumferential direction;

[0013] The first foil comprises a first main body and two first bent portions, the first main body is a circumferentially open annular structure, and the two first bent portions are respectively connected to two ends of the first main body along the circumferential direction;

[0014] The second foil comprises a second main body and two second bent parts, the second main body is a circumferentially open annular structure, and the two second bent parts are respectively connected to two ends of the first main body along the circumferential direction;

[0015] The first bending portion and the second bending portion located on the same side are both inserted into corresponding positioning grooves and fixed.

[0016] In some embodiments, a pin is further included. The annular seat body is provided with a pin hole along the axial direction. The pin hole passes through the positioning groove. The pin is passed through the pin hole to fix the first bending portion and the second bending portion.

[0017] In some embodiments, the bearing base further comprises a convex ridge, which is connected to the outer wall of the annular base body between the two positioning grooves and extends in the axial direction;

[0018] A first air introduction hole is provided on the outer end surface of the ridge in the radial direction, and the first air introduction hole is communicated with the first through hole so as to introduce gas into the porous layer.

[0019] In some embodiments, the convex ridge extends along the entire axial direction of the annular seat body, and the first air inlet hole is provided in the middle area of ​​the convex ridge along the axial direction.

[0020] In some embodiments, the two positioning grooves extend in parallel with the center plane of the annular seat body toward the first through hole and are symmetrical with respect to the center plane of the annular seat body. The first air intake hole is provided in the middle area of ​​the convex ridge along the circumferential direction.

[0021] In some embodiments, a first air inlet hole is provided on the side wall of the bearing base, a ventilation groove is provided on the outer wall of the porous layer, the first air inlet hole is connected to the ventilation groove, and the outer wall of the porous layer except the ventilation groove abuts against the inner wall of the first through hole.

[0022] In some embodiments, the ventilation groove includes: a plurality of first groove segments and a plurality of second groove segments, each first groove segment is arranged at intervals along the circumferential direction and extends axially, each second groove segment is arranged at intervals along the axial direction and extends circumferentially, and each first groove segment and each second groove segment are connected to each other.

[0023] In some embodiments, the first through hole includes a first hole segment and two second hole segments along the axial direction, the two second hole segments are respectively located at two ends of the first hole segment, the inner diameter of the second hole segment is smaller than the inner diameter of the first hole segment, the porous layer is located in the first hole segment, and the two ends of the porous layer along the axial direction abut against the connection between the first hole segment and the second hole segment.

[0024] In some embodiments, a chamfer is provided at the connection between the first hole segment and the second hole segment, and the porous layer and the annular seat body are connected by a filling glue.

[0025] Another aspect of the present disclosure provides a compressor, comprising:

[0026] rotor; and

[0027] The static pressure gas radial bearing of the above embodiment;

[0028] The rotor passes through the second through hole in the center of the porous layer, and a second gap for forming an air film is provided between the porous layer and the rotor.

[0029] In some embodiments, a bearing support is also included, and the bearing base also includes a convex ridge connected to the outer wall of the annular base body, and a first air inlet hole is provided on the radial outer end face of the convex ridge. A mounting hole is provided on the bearing support, and a static pressure gas radial bearing is provided in the mounting hole. A groove matching the convex ridge is provided on the inner wall of the mounting hole. A second air inlet hole is provided in the bearing support, and the second air inlet hole is connected to the first air inlet hole.

[0030] In some embodiments, the rotor is provided with at least two static pressure gas radial bearings along the axial direction, each static pressure gas radial bearing is supported by a bearing support, and the second air inlet holes in each bearing support are interconnected.

[0031] According to another aspect of the embodiments of the present disclosure, an air conditioning device is provided, comprising the compressor of the above embodiment.

[0032] The static pressure gas radial bearing of the disclosed embodiment adds an elastic second foil on the outside of the bearing base. Since the second foil has a certain deformation capacity, when the radial load on the bearing changes, the second foil can adjust its own deformation accordingly, and adaptively adjust the bearing capacity. Moreover, due to the elastic effect of the second foil, it can also provide additional damping for the radial bearing, thereby reducing the vibration generated when the rotating system is working, thereby improving the stability of the entire rotor system. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0034] Figure 1 Schematic cross-sectional views of some embodiments of the static pressure gas radial bearing disclosed herein;

[0035] Figure 2 It is a longitudinal cross-sectional schematic diagram of some embodiments of the static pressure gas radial bearing disclosed in the present invention;

[0036] Figure 3 for Figure 1 A in the enlarged view;

[0037] Figure 4 It is a cross-sectional schematic diagram of some embodiments of the bearing base in the static pressure gas radial bearing disclosed in the present invention;

[0038] Figure 5 It is a longitudinal cross-sectional schematic diagram of some embodiments of the bearing base in the static pressure gas radial bearing disclosed in the present invention;

[0039] Figure 6 It is a front view of some embodiments of the first foil in the static pressure gas radial bearing disclosed in the present invention;

[0040] Figure 7 It is a front view of some embodiments of the second foil in the static pressure gas radial bearing disclosed in the present invention;

[0041] Figure 8 for Figure 7 The enlarged view of point B in the figure;

[0042] Fig. 9 It is a front view of some embodiments of the porous layer in the static pressure gas radial bearing disclosed in the present invention;

[0043] Fig.10 Schematic diagrams of longitudinal sections of some embodiments of the porous layer in the static pressure gas radial bearing disclosed in the present invention;

[0044] Fig.11 Schematic diagram of the structure of some embodiments of the compressor disclosed in the present invention.

[0045] Description of Reference Numerals

[0046] 1. bearing base; 2. first foil; 3. second foil; 4. porous layer; 5. rotor; 6. first bearing support; 6', second bearing support; 7. second air inlet; Q, cavity;

[0047] 11, annular seat; 111, first through hole; 111A, first hole section; 111B, second hole section; 111C, chamfer; 112, pin hole; 113, positioning groove; 12, convex edge; 121, first air inlet hole;

[0048] 21. first main body; 22. first bending portion; 221. second mounting hole; 23. first through hole; 24. second groove;

[0049] 31. second main body; 311. bending portion; 312. connecting portion; 32. second bending portion;

[0050] 41. second through hole; 42. first slot section; 43. second slot section;

[0051] 61. mounting hole; 62. groove;

[0052] 71. Air supply section; 72. First guide branch section; 73. Second guide branch section. DETAILED DESCRIPTION

[0053] The present disclosure is described in detail below. In the following paragraphs, different aspects of the embodiments are defined in more detail. Each aspect so defined can be combined with any other aspect or aspects, unless explicitly stated not to be combined. In particular, any feature that is considered to be preferred or advantageous can be combined with one or more other features that are considered to be preferred or advantageous.

[0054] The terms "first", "second", etc. that appear in the present disclosure are only for the convenience of description to distinguish different components with the same name, and do not indicate a sequence or a primary and secondary relationship.

[0055] In the description of the present disclosure, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present disclosure.

[0056] The air suspension compressor uses gas bearings to support its rotor system. Currently, gas bearings are mainly divided into dynamic pressure gas bearings and static pressure gas bearings.

[0057] Gas bearings can be divided into static pressure gas bearings and dynamic pressure gas bearings according to their different principles. The dynamic pressure gas bearing is a self-acting pressure-type flexible bearing that operates on a layer of lubricating gas film formed by itself. Its principle is the dynamic pressure principle. Static pressure gas bearings are a kind of bearing that supports the rotor system through a pressure gas film generated within a small gap range. The gas enters the gap through the bearing air supply hole and then through the small holes on the bearing surface (laser micropores, porous holes). Since the general gap (0.02mm-0.05mm) is small, the gas is squeezed after entering the gap, causing the pressure to increase, thereby playing a supporting role. Since the gas friction coefficient is small, the static pressure gas bearing is a basically frictionless and low-loss bearing.

[0058] At present, the throttling technologies used in the more common air static pressure bearings include single-hole throttling type, multi-hole throttling type, micro-groove throttling type, micro-pore throttling type, and porous material throttling type. Among them, the porous static pressure gas bearing uses a new porous material as the bearing surface to obtain a lubricating air film with good consistency. There are a large number of tiny air supply holes distributed inside the porous material. The external air source enters the bearing surface through the porous material to form a pressure air film to support the load.

[0059] The working principle of porous gas bearings is relatively complicated. When no external driving force is provided to the rotor and only an external gas source is provided, the bearing supply gas enters the small holes (micropores, porous holes) of the static pressure gas bearing through the air inlet hole, and finally forms a pressure gas film in the gap between the rotor and the bearing to support the external load. Under this working condition, the bearing is equivalent to a pure static pressure gas bearing; when no external gas pressure is provided and only an external driving force is provided to the rotor, due to the dynamic pressure effect of the fluid, the lubricating gas is brought into the wedge-shaped gap and forms a lubricating gas film to bear the external load. At this time, the bearing is equivalent to a pure dynamic pressure gas bearing; when an external gas source and an external force to drive the rotor to rotate are provided at the same time, if the speed is high, the dynamic pressure effect generated by the rotor rotation cannot be ignored.

[0060] The direct stiffness coefficients Kxx and Kyy of the porous hydrostatic bearing increase with the increase of speed, while the direct damping coefficients Cxx and Cyy decrease with the increase of speed. This is because at high speeds, the influence of the dynamic pressure effect on the dynamic characteristics of the bearing is much greater than that of the static pressure effect. The higher the speed, the stronger the wedge effect and dynamic pressure effect of the air film, and the greater the bearing capacity. In this case, it is more difficult to change the thickness distribution of the air film that has been formed, so the bearing exhibits greater stiffness.

[0061] In addition, under high-speed conditions, the gas in the bearing gap is compressed to a higher degree and is squeezed out of the bearing rotor system. The reduction in gas reduces the kinematic viscosity of the gas film, which leads to a decrease in the damping coefficient of the bearing. The reduced damping makes it impossible to offset the vibration of the bearing during operation, so the operating stability of the bearing will be greatly affected. And for rotating machinery, due to the variable operating state of the moving parts, the load it bears also varies accordingly, so the load on the bearing is also complex and variable. For porous static pressure gas bearings, their adaptability is general and they cannot automatically adjust their load-bearing capacity.

[0062] Based on this, Figures 1 to 10 As shown, the present disclosure provides a static pressure gas radial bearing, which in some embodiments includes: a bearing base 1, a porous layer 4, a first foil 2 and a second foil 3. The "circumferential direction", "axial direction" and "radial direction" mentioned later are all relative to the radial bearing.

[0063] Among them, Figure 4 and Figure 5As shown, the bearing base 1 includes an annular seat body 11, and the center of the annular seat body 11 has a first through hole 111 along the axial direction of the bearing. The porous layer 4 is annular and coaxially arranged in the first through hole 111, for example, a porous graphite block. Figure 3 As shown, the first foil 2 is coaxially sleeved outside the annular seat body 11, and a cavity Q is formed between the first foil 2 and the outer wall of the annular seat body 11. The second foil 3 is elastic, coaxially sleeved outside the annular seat body 11, and at least partially located in the cavity Q, and the second foil 3 is pressed against the annular seat body 11 through the first foil 2. The first foil 2 mainly serves to connect and transmit force, and is used to transmit the force of the bearing support to the second foil 3.

[0064] The first foil 2 and the second foil 3 are both made of metal. The second foil 3 can be arranged along the entire circle of the bearing base 1 or nearly the entire circle.

[0065] In this embodiment, an elastic second foil 3 is added to the outer wall of the bearing base 1 of the radial bearing. Since the second foil 3 has a certain elastic deformation ability, when the radial force on the rotor changes and generates vibration, the force is transmitted to the second foil 3 through the air film, forcing the second foil 3 to undergo elastic deformation to eliminate the vibration. When the vibration weakens, the second foil 3 can automatically adjust the deformation amount, thereby being able to adaptively adjust the bearing capacity of the bearing.

[0066] Moreover, due to the elastic effect of the second foil 3, additional damping can be provided for the radial bearing, thereby absorbing the vibration energy of the rotor and reducing the vibration of the rotor, thereby improving the operational stability of the entire rotor system.

[0067] In addition, due to the elastic effect of the second foil 3, when the rotor tilts during rotation, its elastic deformation can cause the air film gap to change, so that the rotor returns to its original position and runs smoothly again through the force of the air film, thereby improving the operating stability of the entire rotor system.

[0068] like Figure 8 As shown, the portion of the second foil 3 located in the cavity Q includes: a plurality of curved portions 311 and a plurality of connecting portions 312, each curved portion 311 and each connecting portion 312 are alternately arranged along the circumferential direction, the curved portion 311 extends along the entire axial direction, and the curved portion 311 protrudes as a whole toward one side of the connecting portion 312 in the radial direction, and the protruding direction of each curved portion 311 is consistent. For example, each curved portion 311 may protrude outward or inward in the radial direction. Thus, each curved portion 311 and each connecting portion 312 form a wavy structure along the circumferential direction.

[0069] For example, the bending portion 311 is C-shaped, triangular, square or trapezoidal, and the connecting portion 312 is arc-shaped and fits with the outer wall of the annular seat body 11 .

[0070] This embodiment designs the second foil 3 as a corrugated structure, so that it has good elastic deformation ability. Since the curved portion 311 protrudes radially, when the axial force on the bearing changes, the second foil 3 can be forced to deform by itself, so that the bearing has a certain degree of self-adaptation. Moreover, the second foil 3 can also provide additional high damping to the bearing. Moreover, if each curved portion 311 protrudes radially outward, the connecting portion 312 of the second foil 3 is completely in contact with the outer wall of the annular seat body 11, which can improve the installation stability of the second foil 3; the first foil 2 and the second foil 3 are in contact through the top of the curved portion 311, which makes it easier to force the second foil 3 to deform through the force of the first foil 2.

[0071] like Figure 3 and Figure 4 As shown, two positioning grooves 113 are provided on the outer side wall of the annular seat body 11 at intervals along the circumferential direction. The first foil 2 includes a first main body 21 and two first bent portions 22, the first main body 21 is a circumferentially open annular structure, and the two first bent portions 22 are respectively connected to the two ends of the first main body 21 along the circumferential direction. The second foil 3 includes a second main body 31 and two second bent portions 32, the second main body 31 is a circumferentially open annular structure, and the two second bent portions 32 are respectively connected to the two ends of the first main body 21 along the circumferential direction. The first foil 2 and the second foil 3 can be formed by bending a metal sheet structure.

[0072] The first bending portion 22 and the second bending portion 32 located on the same side are both inserted into the corresponding positioning groove 113 for fixation, and the thickness of the positioning groove 113 is adapted to the total thickness of the first bending portion 22 and the second bending portion 32 .

[0073] This embodiment can reliably fix the first foil 2 and the second foil 3 to the bearing base 1 to prevent them from detaching from the bearing base 1 when subjected to vibration or external force, and can cause the second foil 3 to elastically deform when the bearing is subjected to radial force transmitted by the rotor system.

[0074] In some embodiments, the static pressure gas radial bearing further includes a pin, and the annular seat body 11 is provided with a pin hole 112 along the axial direction, the pin hole 112 passes through the positioning groove 113, and the pin is inserted into the pin hole 112 to fix the first bending portion 22 and the second bending portion 32. This structure can more reliably fix the first bending portion 22 and the second bending portion 32. After the pin is inserted into the pin hole 112, the first bending portion 22 and the second bending portion 32 can be bent toward the side walls of the two pin holes 112 that are close to each other.

[0075] like Figure 3As shown, the bearing base 1 further includes a ridge 12, which is connected to the outer wall of the annular base body 11 between the two positioning grooves 113 and extends in the axial direction. A first air inlet hole 121 is provided on the radial outer end surface of the ridge 12, and the first air inlet hole 121 is connected to the first through hole 111 to introduce gas into the porous layer 4.

[0076] This embodiment provides a convex rib 12. After the first bending portion 22 and the second bending portion 32 are inserted into the corresponding positioning groove 113, the length section of the first bending portion 22 close to the first main body portion 21 can be pressed against the side wall of the convex rib 12 to prevent the first foil 2 from being deformed by external force at the bending portion, thereby improving the reliability of the connection between the first foil 2 and the second foil 3 and the bearing base 1.

[0077] like Fig.11 As shown, the bearing is supported by a bearing support, a mounting hole 61 is provided on the bearing support, a static pressure gas radial bearing is arranged in the mounting hole 61, and a groove 62 is provided on the inner wall of the mounting hole 61 to cooperate with the convex rib 12. During assembly, the convex rib 12 is embedded in the groove 62, which can prevent the bearing from rotating in the radial direction.

[0078] like Figure 5 As shown, the ridge 12 extends along the entire axial direction of the annular seat body 11 , and the first air inlet hole 121 is provided in the middle area of ​​the ridge 12 along the axial direction.

[0079] This embodiment enables the bearing to be smoothly installed into the mounting hole 61 from the side, and the first air inlet hole 121 is arranged in the middle area of ​​the convex ridge 12 along the axial direction, so that the gas can flow axially toward both sides at the same time after being introduced, thereby making the air intake distribution on both sides of the porous layer 4 more symmetrical, improving the stability of the air film formed between the porous layer 4 and the rotor 5, and preventing the rotor 5 from deflecting during operation.

[0080] like Figure 3 As shown, the two positioning grooves 113 extend in a direction close to the first through hole 111 in parallel with the central plane of the annular seat body 11, and are symmetrical with respect to the central plane of the annular seat body 11, and the first air inlet hole 121 is provided in the middle area of ​​the convex ridge 12 along the circumferential direction. For example, the first air inlet hole 121 is a circular hole structure to maintain the pressure of the introduced gas.

[0081] This embodiment can make the wall thickness of the ridge 12 on both sides of the first air duct 121 the same, so as to ensure the structural strength of the ridge 12 and prevent the long-term introduction of high-pressure gas from affecting the strength of weak parts. It can also prevent the positioning groove 113 from being deformed, thereby ensuring the reliability of fixing the first bending portion 22 and the second bending portion 32.

[0082] like Figure 1 and Figure 2As shown, a first air inlet hole 121 is provided on the side wall of the bearing base 1, and a ventilation groove is provided on the outer wall of the porous layer 4 as an air cavity. The first air inlet hole 121 is connected to the ventilation groove, and the outer wall of the porous layer 4 except the ventilation groove abuts against the inner wall of the first through hole 111.

[0083] After entering from the first air inlet hole 121, the external air will enter into the small holes of the porous layer 4 through the ventilation grooves to form an annular air film between the inner wall of the porous layer 4 and the rotor 5. The outer wall of the porous layer 4 is pressed against the inner wall of the first through hole 111, which can provide a stable supporting force for the porous layer 4 and prevent the porous layer 4 from breaking when the force is too large.

[0084] like Figure 1 and Figure 2 As shown, the ventilation groove includes: a plurality of first groove segments 42 and a plurality of second groove segments 43, each first groove segment 42 is arranged at intervals along the circumferential direction and extends along the axial direction, each second groove segment 43 is arranged at intervals along the axial direction and extends along the circumferential direction, each first groove segment 42 and each second groove segment 43 are crossed to form a grid shape and are interconnected, and the ribs between each groove segment are in contact with the inner wall of the first through hole 111 to provide support for the porous layer 4. Figure 4 As shown, four first slot sections 42 extending in the axial direction are evenly spaced along the circumferential direction. Figure 5 As shown, three annular second groove segments 43 are evenly spaced apart in the axial direction.

[0085] By providing each of the first groove sections 42 and the second groove sections 43, the gas entering from the first air inlet holes 121 can be guided to various positions of the porous layer 4 to form a uniform and stable air film. Moreover, the gas first gathers in the ventilation groove, which allows the gas to enter the porous layer 4 more stably and sufficiently, and allows the gas to penetrate into the gap more uniformly.

[0086] like Figure 5 As shown, the first through hole 111 includes a first hole segment 111A and two second hole segments 111B along the axial direction. The two second hole segments 111B are respectively located at the two ends of the first hole segment 111A. The inner diameter of the second hole segment 111B is smaller than the inner diameter of the first hole segment 111A. The porous layer 4 is located in the first hole segment 111A, and the two ends of the porous layer 4 along the axial direction abut against the connection between the first hole segment 111A and the second hole segment 111B.

[0087] This embodiment can limit the two ends of the porous layer 4 along the axial direction after the porous layer 4 is installed in the first through hole 111, so that it is not easy to fall out, thereby improving the firmness of the installation of the porous layer 4.

[0088] like Figure 5As shown, a chamfer 111C is provided at the connection between the first hole section 111A and the second hole section 111B, and the porous layer 4 and the annular seat body 11 are connected by filling glue. This structure is easy to fill with glue and can reliably fix the porous layer 4.

[0089] The hydrostatic gas radial bearing of the above-mentioned embodiment of the present disclosure has good damping characteristics and adaptive capabilities. Under the condition of high speed, it can provide additional high damping to the bearing to prevent the bearing from becoming unstable when the bearing damping decreases due to the enhanced bearing dynamic pressure effect at high speed, which well compensates for the shortcoming of low damping of the porous hydrostatic gas bearing under high speed. Moreover, the deformation ability of the second foil enables the bearing to have a certain adaptive ability, which produces a large deformation when the vibration is large and recovers the deformation when the vibration is small, making good use of the change in the rotor vibration, so that the bearing has flexible vibration resistance, thereby improving the speed operating range of the porous hydrostatic bearing and the stability of the porous hydrostatic gas bearing. Therefore, the bearing can improve the operating stability and reliability of the equipment rotor system, and solve the problem of rotor operation instability caused by the reduction of the damping of the hydrostatic gas bearing under high speed.

[0090] Moreover, the bearing can well fix the first foil 2 and the second foil 3 on the bearing base 1 to prevent the first foil 2 and the second foil 3 from fracturing during operation, thereby improving the operating reliability of the bearing.

[0091] Secondly, the present disclosure provides a compressor, such as a centrifugal compressor. In some embodiments, Fig.11 As shown, the compressor comprises: a rotor 5 and the static pressure gas radial bearing of the above embodiment. The rotor 5 passes through the second through hole 41 at the center of the porous layer 4, and a second gap for forming an air film is provided between the porous layer 4 and the rotor 5.

[0092] When the compressor of this embodiment is in different working conditions, the radial force on the rotor will change greatly. Since the second foil 3 of the radial bearing has a certain deformation ability, it can adjust the air film gap between the radial bearing and the rotor 5 by adjusting its own deformation, and then adaptively adjust the bearing capacity. Therefore, the radial bearing can have a stable bearing capacity under various working conditions of the compressor, improving adaptability. Moreover, due to the elastic effect of the second foil 3, it can also provide additional damping for the radial bearing, thereby reducing the vibration generated when the rotation system is working, thereby improving the stability of the compressor operation.

[0093] In some embodiments, Fig.11As shown, the compressor also includes a bearing support, and the bearing base 1 also includes a ridge 12 connected to the outer wall of the annular seat body 11, and a first air inlet hole 121 is provided on the radial outer end surface of the ridge 12. A mounting hole 61 is provided on the bearing support, and a static pressure gas radial bearing is arranged in the mounting hole 61. A groove 62 matching the ridge 12 is provided on the inner wall of the mounting hole 61. A second air inlet hole 7 is provided in the bearing support, and the second air inlet hole 7 is connected to the first air inlet hole 121.

[0094] This embodiment not only achieves the positioning of the bearing and prevents the bearing from rotating in the mounting hole 61 by matching the ridge 12 with the groove 62, but also supplies gas to the first air inlet hole 121 through the second air inlet hole 7 inside the bearing support, thereby solving the problem of difficulty in air inlet caused by arranging the first foil 2 and the second foil 3 outside the bearing base 1.

[0095] In some embodiments, the rotor 5 is provided with at least two static pressure gas radial bearings along the axial direction, each static pressure gas radial bearing is supported by a bearing support, and the second air inlet holes 7 in each bearing support are interconnected. This structure can make the gas supply pressure of each static pressure gas radial bearing consistent, so that the gas film pressure generated by each radial bearing is close, thereby providing a more balanced support force for the rotor 5 and making the rotor 5 work stably.

[0096] For example, both ends of the rotor 5 are supported by a radial bearing respectively, and the two radial bearings are supported by a first bearing support 6 and a second bearing support 6' respectively. The first foil 2 contacts the hole wall of the mounting hole 61 of the bearing support so that when the bearing support is subjected to vibration caused by radial force, the vibration is transmitted to the second foil 3 through the first foil 2, so that the second foil 3 adapts to the change of radial force through elastic deformation.

[0097] The second air bleed hole 7 includes an air supply section 71, a first guide branch section 72 and a second guide branch section 73. The air supply section 71 is used to introduce external air. The two ends of the first guide branch section 72 are respectively connected to the air supply section 71 and the first air bleed hole 121. The two ends of the second guide branch section 73 are respectively connected to the air supply section 71 and the second guide branch section 73 of another bearing support, which is equivalent to the second guide branch sections 73 of the two bearing supports being connected. Influenced by the layout of the components in the compressor housing, the structures of the first bearing support 6 and the second bearing support 6' are different, and thus the structure of the second air bleed hole 7 is also different.

[0098] Again, the present disclosure also provides an air-conditioning device, comprising the compressor of the above embodiment.

[0099] The above is a detailed introduction to a static pressure gas radial bearing, a compressor and an air conditioning device provided by the present disclosure. Specific embodiments are used herein to illustrate the principles and implementation methods of the present disclosure. The description of the above embodiments is only used to help understand the method of the present disclosure and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present disclosure, several improvements and modifications can be made to the present disclosure, and these improvements and modifications also fall within the scope of protection of the claims of the present disclosure.

Claims

1. A static pressure gas radial bearing, characterized in that: include: A bearing base (1) comprises an annular base body (11), wherein the center of the annular base body (11) has a first through hole (111); A porous layer (4) having an annular structure and coaxially disposed in the first through hole (111); A first foil (2) is coaxially sleeved on the outside of the annular seat (11), and a cavity (Q) is provided between the first foil (2) and the outer wall of the annular seat (11); and A second foil (3) having elasticity, coaxially sleeved on the outside of the annular seat (11), and at least partially located in the cavity (Q), the second foil (3) being pressed against the annular seat (11) through the first foil (2); A first air inlet hole (121) is provided on the side wall of the bearing base (1), a ventilation groove is provided on the outer wall of the porous layer (4), the first air inlet hole (121) is connected to the ventilation groove, and the outer wall of the porous layer (4) except the ventilation groove abuts against the inner wall of the first through hole (111).

2. The static pressure gas radial bearing according to claim 1, characterized in that: The portion of the second foil (3) located in the cavity (Q) comprises: a plurality of bent portions (311) and a plurality of connecting portions (312), wherein the bent portions (311) and the connecting portions (312) are alternately arranged in a circumferential direction, the bent portions (311) extend in an axial direction, and the bent portions (311) protrude as a whole in a radial direction toward one side of the connecting portion (312), and the protruding directions of the bent portions (311) are consistent.

3. The static pressure gas radial bearing according to claim 1, characterized in that: Two positioning grooves (113) are provided on the outer side wall of the annular seat body (11) at intervals along the circumferential direction; The first foil (2) comprises a first main body portion (21) and two first bent portions (22); the first main body portion (21) is a circumferentially open annular structure; the two first bent portions (22) are respectively connected to two ends of the first main body portion (21) along the circumferential direction; The second foil (3) comprises a second main body portion (31) and two second bent portions (32); the second main body portion (31) is a circumferentially open annular structure; the two second bent portions (32) are respectively connected to two ends of the first main body portion (21) along the circumferential direction; Wherein, the first bending portion (22) and the second bending portion (32) located on the same side are both inserted into the corresponding positioning groove (113) for fixation.

4. The static pressure gas radial bearing according to claim 3, characterized in that: It also comprises a pin, the annular seat body (11) is provided with a pin hole (112) along the axial direction, the pin hole (112) passes through the positioning groove (113), and the pin is passed through the pin hole (112) to fix the first bending portion (22) and the second bending portion (32).

5. The static pressure gas radial bearing according to claim 3, characterized in that: The bearing base (1) further comprises a ridge (12), wherein the ridge (12) is connected to an outer wall of the annular base body (11) between the two positioning grooves (113) and extends in the axial direction; A first air inlet hole (121) is provided on the radial outer end surface of the convex ridge (12), and the first air inlet hole (121) is connected to the first through hole (111) so as to introduce gas into the porous layer (4).

6. The static pressure gas radial bearing according to claim 5, characterized in that: The convex ridge (12) extends along the entire axial direction of the annular seat body (11), and the first air inlet hole (121) is provided in a middle area of ​​the convex ridge (12) along the axial direction.

7. The static pressure gas radial bearing according to claim 5, characterized in that: The two positioning grooves (113) extend in a direction close to the first through hole (111) in parallel with the central plane of the annular seat body (11), and are symmetrical with respect to the central plane of the annular seat body (11). The first air inlet hole (121) is arranged in a middle area of ​​the convex ridge (12) along the circumferential direction.

8. The static pressure gas radial bearing according to claim 1, characterized in that: The ventilation groove comprises: a plurality of first groove sections (42) and a plurality of second groove sections (43), each of the first groove sections (42) being arranged at intervals along the circumferential direction and extending along the axial direction, each of the second groove sections (43) being arranged at intervals along the axial direction and extending along the circumferential direction, and each of the first groove sections (42) and each of the second groove sections (43) being communicated with each other.

9. The static pressure gas radial bearing according to claim 1, characterized in that: The first through hole (111) comprises a first hole segment (111A) and two second hole segments (111B) along the axial direction, the two second hole segments (111B) are respectively located at two ends of the first hole segment (111A), the inner diameter of the second hole segment (111B) is smaller than the inner diameter of the first hole segment (111A), the porous layer (4) is located in the first hole segment (111A), and the two ends of the porous layer (4) along the axial direction abut against the connection between the first hole segment (111A) and the second hole segment (111B).

10. The static pressure gas radial bearing according to claim 9, characterized in that: A chamfer (111C) is provided at the connection between the first hole section (111A) and the second hole section (111B), and the porous layer (4) and the annular seat body (11) are connected by means of a filling glue.

11. A compressor, characterized in that: include: Rotor (5); and The static pressure gas radial bearing according to any one of claims 1 to 10; The rotor (5) passes through a second through hole (41) at the center of the porous layer (4), and a second gap for forming an air film is provided between the porous layer (4) and the rotor (5).

12. The compressor according to claim 11, characterized in that The invention also comprises a bearing support (6; 6'), wherein the bearing base (1) further comprises a convex ridge (12) connected to the outer wall of the annular seat body (11), a first air inlet hole (121) being provided on the radial outer end surface of the convex ridge (12), a mounting hole (61) being provided on the bearing support (6; 6'), the static pressure gas radial bearing being arranged in the mounting hole (61), a groove (62) cooperating with the convex ridge (12) being provided on the inner wall of the mounting hole (61), and a second air inlet hole (7) being provided in the bearing support (6; 6'), the second air inlet hole (7) being in communication with the first air inlet hole (121).

13. The compressor according to claim 12, characterized in that The rotor (5) is provided with at least two static pressure gas radial bearings along the axial direction, each static pressure gas radial bearing is supported by one of the bearing supports (6; 6'), and the second air inlet holes (7) in the bearing supports (6; 6') are interconnected.

14. An air conditioning device, characterized in that: Including the compressor described in any one of claims 11 to 13.

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