Bearing structures, motors and compressors

Abstract

The present invention provides a bearing structure, motor, and compressor, wherein the bearing structure comprises: a bearing seat; a top foil disposed in the bearing seat, the top foil forming a receiving cavity for accommodating a rotor; and a corrugated foil member disposed in the bearing seat, the corrugated foil member being positioned between the top foil member and the bearing seat, the corrugated foil member comprising multiple support structures; wherein the top foil member has a double-layer cavity structure. The technical solution of the present invention enables the support structures and the top foil member to jointly support the rotor, preventing irreversible deformation and damage caused by excessive bearing capacity of the first corrugated foil member, thereby improving the support force and bearing capacity of the rotor.

Description

Technical Field

[0001] The present application belongs to the technical field of compressors, and specifically relates to a bearing structure, a motor and a compressor. Background Art

[0002] In the prior art, the radial foil gas dynamic pressure bearing has low stiffness and damping, and cannot adjust the stiffness according to the load conditions, and thus cannot adjust the load-bearing capacity and cannot withstand greater loads. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0004] To this end, a first aspect of the present invention provides a bearing structure.

[0005] A second aspect of the present invention provides a motor.

[0006] A third aspect of the present invention provides a compressor.

[0007] A first aspect of the present invention provides a bearing structure, comprising: a bearing seat; a top foil, arranged in the bearing seat, the top foil forming a accommodating cavity, the accommodating cavity being used to accommodate a rotor; a wave foil member, arranged in the bearing seat, the wave foil member being located between the top foil and the bearing seat, the wave foil member comprising a plurality of supporting structures; wherein the top foil and is a double-layer cavity structure.

[0008] The present invention provides a bearing structure, which includes a bearing seat, a first corrugated foil member, and a corrugated foil member. A top foil is disposed in the bearing seat and extends circumferentially along the bearing seat to form a housing cavity. The housing cavity can accommodate a rotor, which can rotate within the housing cavity. It is understood that the top foil can contact the rotor and provide radial support for the rotor. When the rotor rotates, the rotor rotates within the housing cavity, forming air film pressure, causing the rotor to gradually levitate and rotate. While supporting the rotor, the air film pressure also squeezes the top foil, allowing the top foil to support the rotor through the air film pressure, thereby effectively supporting the rotor. Furthermore, the corrugated foil member is also disposed in the bearing seat, specifically, between the top foil and the bearing seat, and includes a plurality of support structures for supporting the top foil. It is understood that the plurality of support structures are located between the top foil and the bearing seat, allowing the top foil to contact the plurality of support structures, thereby allowing the plurality of support structures to support the top foil and share the pressure of the top foil. Furthermore, as the rotor rotates within the cavity formed by the top foil, the air film pressure gradually pushes against the top foil as the rotor speed increases. When the rotor is lightly loaded, the top foil alone can effectively support the rotor. When the rotor is heavily loaded or encounters an impact, the air film pressure generated by the rotor's rotation is high. At this time, the multiple support structures contained in the bump foil will support the top foil, resulting in the top foil and the bump foil jointly supporting the rotor, thereby ensuring stable rotor rotation.

[0009] Furthermore, the top foil has a double-layer cavity structure. It is understandable that when the top foil has a double-layer cavity structure, when the air film pressure formed by the rotation of the rotor squeezes the top foil, the cavity inside the top foil will be compressed, thereby improving the damping property of the top foil. In this way, the cavity structure of the top foil can be used to dissipate part of the energy caused by the vibration of the rotor, ensuring the stable rotation of the rotor while providing effective support for the rotor. Furthermore, when the rotor speed gradually decreases, the air film pressure in the accommodating cavity will also decrease, causing the air film pressure on the top foil to gradually decrease, and the corrugated foil will gradually return to its initial state. At this time, the rotor is supported only by the top foil. When the rotor continues to reduce its speed (the rotor stops running), the top foil also begins to gradually return to its original state, and when the rotor stops completely, it returns to its original state.

[0010] Furthermore, the support structure can also be a double-layer cavity structure. The cavity structure can improve the damping properties of the support structure. When the top foil needs to be supported, the multiple support structures of the double-layer cavity structure have greater rigidity. Since the support structure is a double-layer cavity structure, the friction between the upper and lower layers of wave foils forming the cavity is increased, and the friction area between the wave foils is increased, thereby increasing the friction damping, making it able to bear greater pressure, and the cavity structure can further dissipate the vibration energy brought by the rotor through the top foil, ensuring the stability of the rotor rotation, and improving the support capacity of the rotor, thereby improving the bearing capacity of the rotor.

[0011] Furthermore, in one possible scenario, the top foil and multiple support structures can all be double-layer cavity structures, and their working process is as follows: First, the rotor is started to rotate. The rotor speed gradually increases during rotation, thereby forming an air film pressure. The top foil is squeezed by the air film pressure and begins to deform. Because the top foil has a double-layer cavity structure, as the air film pressure increases, the cavity will be continuously compressed to adapt to the changing air film pressure. The cavity structure also has good damping properties and can absorb the vibration energy generated by the rotor rotation, reducing the impact of vibration energy on the rotor. At this time, the air film pressure is relatively low, and the top foil can support the rotor. When the load of the rotor changes, the air film pressure will also change accordingly. When the air film pressure increases, the top foil cannot effectively support the rotor. At this time, the top foil will transmit the extrusion force to the support structure, and the support structure is also a double-layer cavity structure. When the corrugated foil close to the top foil is deformed and contacts the outer corrugated foil, the outer corrugated foil can provide further support. Therefore, the support structure has a high rigidity and can effectively support the top foil to prevent the top foil from being squeezed and deformed, thereby ensuring support for the rotor and making the rotor rotate stably.

[0012] Among them, when the rotor load becomes larger, its vibration energy will also become larger and will be transmitted to the top foil and the supporting structure. The cavities of the top foil and the supporting structure can jointly absorb the vibration energy, thereby reducing the impact of the vibration energy on the rotor.

[0013] Furthermore, in the above scenario, when the rotor speed is low in the early stage, the air film pressure generated is small and cannot support the rotor. The rotor will rotate along the wall of the accommodating cavity. Due to factors such as inertia and air film pressure, the rotor will increase the pressure on the position contacting the wall of the accommodating cavity. The rotor is supported by the first wave foil and the support structure under pressure to ensure effective support for the rotor.

[0014] Furthermore, the materials of the top foil and the corrugated foil can be beryllium bronze, nickel-based alloy, high-strength stainless steel, etc. The inner wall of the accommodating cavity formed by the top foil is sprayed with a wear-resistant self-lubricating material.

[0015] The bearing structure provided by the present invention has a top foil formed with a housing cavity, within which the rotor can rotate. A support structure is disposed between the top foil and the bearing seat, enabling the support structure to support the rotor via the top foil. This allows the support structure and top foil to jointly support the rotor, preventing irreversible deformation and damage caused by excessive bearing capacity of the first wave foil, thereby increasing support for the rotor and its bearing capacity. Furthermore, the top foil has a double-layer cavity structure, which ensures stiffness while improving damping, enabling it to fully absorb or absorb most of the vibration energy generated by the rotor during rotation, thereby improving rotor stability.

[0016] In addition, the rotor structure in the technical solution provided by the present invention may also have the following additional technical features:

[0017] In the above technical solution, further, the supporting structure includes a first wave foil; a second wave foil, the second wave foil and the first wave foil have a gap in the radial direction of the bearing structure to form a cavity structure, and the first wave foil is closer to the top foil than the second wave foil; wherein, when the top foil is subjected to force to press the first wave foil, the first wave foil can move in a direction close to the first wave foil and abut against the second wave foil.

[0018] In this technical solution, the support structure includes a first corrugated foil and a second corrugated foil. It is understood that the first corrugated foil and the second corrugated foil together form the support structure, forming a double-layer structure. This improves the stiffness and damping properties of the support structure, thereby enhancing the support effect on the rotor.

[0019] Furthermore, a gap is defined between the first and second corrugated foils in the radial direction of the bearing structure, forming a cavity structure. The first corrugated foil is closer to the top foil than the second corrugated foil. This cavity structure can, understandably, enhance the damping and stiffness of the support structure, improving rotor support. When the rotor is heavily loaded, the first and second corrugated foils can jointly support the rotor, ensuring sufficient support and increasing its load capacity.

[0020] Furthermore, the arrangement of the first and second corrugated foils increases the overall rigidity of the support structure, preventing deformation and failure, and ensuring stable support for the rotor. Furthermore, the cavity structure further absorbs and dissipates the vibration energy generated by the rotating rotor, reducing its impact and ensuring rotor stability.

[0021] Furthermore, when the top foil is subjected to force to press the first wave foil, the first wave foil can move in the direction close to the first wave foil and abut against the second wave foil. It can be understood that when the load on the rotor is large, the top foil will be subjected to force to press against the first wave foil, causing the first wave foil and the top foil to contact and jointly support the rotor. At this time, if the supporting force of the first wave foil and the top foil can achieve stable support for the rotor, the first wave foil will not continue to move in the direction of the second wave foil, and the rotor will only be supported by the first wave foil and the top foil. If the supporting force of the first wave foil and the top foil cannot effectively support the rotor, the first wave foil will move in the direction of the second wave foil and abut against the second wave foil. At this time, the top foil, the first wave foil and the second wave foil jointly support the rotor, increasing the overall supporting force, so that the rotor can be effectively supported and the load capacity of the rotor can be increased. Furthermore, the gap between the first wave foil and the second wave foil is 0.03mm to 0.12mm. It is understandable that by properly setting the gap between the first and second corrugated foils, the stiffness and damping properties of the support structure can be improved, ensuring the supporting force of the support structure. It is understandable that the gap between the first and second corrugated foils should not be too small. If it is less than 0.03mm, the gap between the first and second corrugated foils will be too small, reducing the damping properties of the support structure and also reducing the absorption of rotor vibration energy, making it impossible to ensure the smooth rotation of the rotor. If the gap between the first and second corrugated foils is greater than 0.12mm, when the rotor is overloaded, the first corrugated foil will be squeezed and irreversibly deformed before it comes into contact with the second corrugated foil, further causing deformation and damage to the top foil and the first corrugated foil, making it unable to support the rotor. Therefore, setting the gap between the first and second corrugated foils within the range of 0.03mm to 0.12mm can ensure the stiffness and damping properties of the support structure, improve the support effect on the rotor, and increase the rotor's load capacity. In the above technical solution, further, the ends of the first corrugated foil and the second corrugated foil are arranged close to the bearing seat, and the middle parts of the first corrugated foil and the second corrugated foil protrude toward the top foil.

[0022] In this technical solution, both ends of the first corrugated foil and the second corrugated foil are close to the bearing seat, and the middle parts of the first corrugated foil and the second corrugated foil protrude toward the top foil, forming an arched cavity structure.

[0023] It can be understood that the protruding portions of the first and second corrugated foils have a certain height relative to their ends, forming a cavity between the first and second corrugated foils. Thus, when the top foil is pressed against the first corrugated foil, the protruding portion of the first corrugated foil first contacts the top foil, providing support for the top foil. As the squeezing force of the first corrugated foil gradually increases, the cavity of the first corrugated foil is gradually compressed, and the first corrugated foil gradually deforms toward the second corrugated foil. At this point, the first corrugated foil contacts the second corrugated foil, allowing the second and first corrugated foils to jointly support the top foil, improving support capacity and thereby providing stable support for the rotor.

[0024] Furthermore, the first and second corrugated foils are arched structures. It is understood that the arched structures formed at both ends and the middle of the first and second corrugated foils gradually deform when squeezed, and their supporting force gradually increases as they deform. This allows the arc-shaped structures to adaptively deform in response to changes in the rotor's load, speed, and other factors to ensure effective supporting force, effectively supporting the rotor and improving its stable operation.

[0025] Furthermore, the arched shape will also improve the elasticity of the first wave foil and the second wave foil. When the load of the rotor is reduced, the first wave foil and the second wave foil can gradually return to the arched shape, ensuring that the rotor can be stably suspended in the accommodating cavity, avoiding unstable rotation of the rotor when the load is reduced.

[0026] Furthermore, by arranging the ends of the first wave foil and the second wave foil close to the bearings, and making the middle positions of the first wave foil and the second wave foil protrude in the direction of the top foil, the first wave foil and the second wave foil can increase the supporting force through deformation, and the first wave foil and the second wave foil can adaptively change the supporting force according to the extrusion force received, thereby achieving stable support for the rotor.

[0027] In the above technical solution, further, the wave height of the first wave foil is greater than the wave height of the second wave foil.

[0028] In this technical solution, the wave height of the first corrugated foil is greater than that of the second corrugated foil. The first and second corrugated foils are constructed as arc-shaped arch structures, that is, the head shape of the first and second corrugated foils in the radial cross section is an arc segment, and the height of the arc can be understood as the wave height of the first and second corrugated foils.

[0029] It can be understood that making the wave height of the first wave foil greater than the wave height of the second wave foil can improve its bearing effect on the rotor. When the rotor is working, the air film pressure formed by the rotor will squeeze the top foil to the first wave foil. Since the wave height of the first wave foil is greater than the wave height of the second wave foil, the first wave foil first supports the top foil and deforms. The first wave foil gradually increases its supporting force as it deforms. When the supporting force provided by the first wave foil and the top foil is not enough to support the stable rotation of the rotor, the first wave foil contacts the second wave foil, thereby driving the second wave foil to deform to increase the supporting force. In this way, the first wave foil and the second wave foil jointly support the top foil, ensuring the supporting strength, thereby achieving stable support for the rotor.

[0030] Because the first corrugated foil has a greater wave height than the second corrugated foil, in some cases the first corrugated foil deforms without contacting the second corrugated foil. The first corrugated foil's support is sufficient to stabilize the top foil. This allows the rotor to be supported solely by the first corrugated foil and the top foil, preventing the second corrugated foil from also supporting the rotor. This reduces the number of times the second corrugated foil deforms and increases its service life.

[0031] In the above technical solution, further, the stiffness of the first corrugated foil is greater than the stiffness of the second corrugated foil.

[0032] In this technical solution, the stiffness of the first corrugated foil is less than that of the second corrugated foil. As can be understood, when the stiffness of the second corrugated foil is greater than that of the first, it can prevent significant deformation of the second corrugated foil, preventing it from collapsing and undergoing irreversible deformation, which would result in an inability to effectively support the rotor. However, when the stiffness of the first corrugated foil is less than that of the second, it can undergo significant deformation in response to changes in load capacity, ensuring that the first corrugated foil continues to deform when in contact with the second corrugated foil, providing continuous support for the top foil and thus providing stable support for the rotor.

[0033] In the above technical solution, further, the bump foil further includes: a connecting structure for connecting any two adjacent supporting structures among the plurality of supporting structures.

[0034] In this technical solution, the bump foil also includes a connecting structure that can connect two adjacent support structures, allowing the multiple support structures to be connected via the connecting structure. It can be understood that the multiple support structures are located between the top foil and the bearing seat, and the connecting structure can connect the multiple support structures to form a single entity, thereby defining the positions of the multiple support members. This ensures that the pressure on the multiple support members is even, preventing excessive pressure on some support structures, which could cause damage.

[0035] Furthermore, there is a first distance between any two adjacent connecting structures. It is understandable that by setting the distance between any two adjacent connecting structures, the specific size of the support structure can be defined, and then by reasonably setting the first distance, the supporting force of the support structure can be improved. It is worth noting that the first distance should not be too large. When the distance between two adjacent connecting structures is relatively large, the wave height of the support structure will decrease, and the rigidity will also decrease, which will reduce the supporting force of the support structure. Similarly, the first distance should not be too small, which will make the wave height of the support structure higher, the rigidity larger, and the deformation more difficult, reducing the damping property, so that the support structure does not have enough compression stroke when subjected to force, and thus cannot effectively support the top foil. Therefore, the size of the first distance should be set within a reasonable range to ensure the rigidity and deformation of the support structure and to ensure its supporting force.

[0036] In the above technical solution, further, the plurality of support structures are distributed at intervals along the circumferential direction of the bump foil; and / or the plurality of support structures extend along the axial direction of the bump foil.

[0037] In this technical solution, multiple support structures are spaced apart along the circumference of the bump foil. As can be understood, these multiple support structures can support the top foil. Evenly distributing these support structures at regular intervals around the circumference of the bump foil ensures uniform contact between the multiple support structures and the top foil. This allows pressure on the top foil to be evenly transferred to the multiple support structures, ensuring that each support structure experiences substantially the same pressure. This improves the support provided by the support structures to the top foil, and consequently, the rotor.

[0038] Furthermore, the distance between two adjacent support structures in the multiple support structures can be adjusted as needed. It is understandable that when the rotor load in the scenario where the bearing structure is used is relatively small, the number of support structures can be reduced. On the one hand, this can reduce the weight of the bearing structure and optimize the overall structure of the bearing structure. On the other hand, it can also reduce the use of support structure materials and reduce the cost of use. When the rotor load in the scenario where the bearing structure is used is relatively large, the number of support structures can be increased to disperse the pressure borne by each support structure, ensure the supporting force of the support structure, avoid the support structure being crushed or causing irreversible deformation, and ensure stable support for the rotor.

[0039] It's important to note that the number of support structures should not be too small. If this is the case, large gaps will form between adjacent support structures, and the top foil in this gap will not be effectively supported, which can easily cause irreversible deformation. This can cause portions of the cavity wall formed by the top foil to deform toward the support structure. In this case, the rotor will collide with the cavity wall at the deformed location during rotation, damaging the rotor and the first wave foil and causing instability during rotor rotation. Therefore, the number of support structures should not be too small.

[0040] Furthermore, multiple support structures extend along the axial direction of the second wave foil, so that the top foil can always be in contact with the support structure in the axial direction. It can be understood that the top foil has a certain length in the axial direction to accommodate the rotation of the rotor in the accommodating cavity. When the rotor rotates in the accommodating cavity, there is air film pressure at all positions of the accommodating cavity in the axial direction of the accommodating cavity. Extending multiple support structures along the axial direction of the second wave foil can increase the contact area between the support structure and the top foil, thereby increasing the support range of the support structure, and effectively supporting all positions in the axial direction of the top foil. Furthermore, the support force obtained by the rotor in the axial direction is uniform, ensuring that both ends of the rotor can be stably suspended in the center position of the accommodating cavity, thereby improving the stability of the rotor during operation. It can also increase the critical speed of the rotor and improve the performance of the rotor.

[0041] Furthermore, multiple support structures can be staggered in the axial direction. As can be appreciated, staggering multiple support structures can, on the one hand, support the top foil at different angles, distributing the pressure of the top foil at different angles, thereby effectively supporting the top foil and further ensuring the stability of the rotor during operation. On the other hand, staggering multiple support structures prevents large gaps from forming between adjacent support structures, preventing the top foil from collapsing into the gaps. While ensuring support for the top foil, it also reduces the number of support structures in the axial direction, reduces the weight of the bearing structure, and reduces its operating cost.

[0042] Furthermore, the axial length of the multiple support structures is equal to the axial length of the top foil. It is understandable that if the axial length of the multiple support structures is less than the axial length of the top foil, part of the top foil will not be supported by the support structure, thereby reducing the support effect on the rotor. If the axial length of the multiple support structures is greater than the axial length of the top foil, on the one hand, the support structure will provide excessive support to the top foil, which is not conducive to cost control and increases the cost of use. On the other hand, the support structure will interfere with other components or external objects, causing collision damage. Therefore, setting the axial length of the multiple support structures to be equal to the axial length of the top foil can enable the support structure to fully support the top foil, avoid the situation where part of the top foil is not effectively supported, ensure the support effect on the top foil, and thereby improve the support effect on the rotor.

[0043] In the above technical solution, further, the top foil further includes: a third wave foil; a fourth wave foil, and a gap is provided between the third wave foil and the fourth wave foil to form a cavity structure.

[0044] In this technical solution, the top foil also includes a third and fourth corrugated foil. The third and fourth corrugated foils are designed to be separated, with a certain gap between them, forming a cavity structure, thus forming a double-layer cavity structure for the first corrugated foil. It can be understood that the certain gap between the third and fourth corrugated foils allows the top foil to have a certain degree of elastic deformation, thereby increasing its bearing capacity and the pressure it can withstand.

[0045] Furthermore, when the rotor works in the accommodating cavity, the vibration energy generated will be transmitted to the cavity structure, and the cavity structure can absorb the vibration energy, thereby reducing the impact of the vibration energy on the rotor rotation and improving the stability of the rotor rotation.

[0046] Furthermore, the third wave foil is closer to the rotor than the fourth wave foil, allowing the rotor to directly contact the third wave foil. During rotor startup, the rotor and the third wave foil generate significant friction, causing more severe wear on the third wave foil than on the fourth wave foil, shortening its service life. Therefore, the third and fourth wave foils can be designed to be detachably connected. This way, if the third wave foil becomes damaged and needs to be replaced, only the third wave foil can be replaced, eliminating the need to replace the entire top foil. This saves costs and extends the service life of the top foil.

[0047] In the above technical solution, further, the bearing structure further includes: a plurality of separation slits, and the plurality of separation slits are distributed at intervals on the bump foil along the axial direction of the bearing structure.

[0048] In this technical solution, multiple separation slits are spaced along the axial direction of the bearing structure, extending through the bump foil element and dividing it into several bump foil segments. This in turn divides the first and second bump foil elements into several bump foil segments, each of which includes multiple support structures to support the top foil. Specifically, the separation slits divide the second bump foil element into several bump foil segments, each of which includes multiple support structures. When a support structure is subjected to force, the compressed support structure causes the corresponding bump foil segment to deform, preventing it from being squeezed and deformed. When the pressure is removed, the bump foil segments return to their original shape, thereby improving the support structure's load-bearing capacity.

[0049] In the above technical solution, further, the multiple separation slits include: a first separation slit, which is a separation slit close to the two axial ends of the bump foil member; a second separation slit, which is arranged between the two first separation slits; wherein, the bump foil segment between the first separation slit and the axial end of the bump foil member is the first bump foil segment, and the bump foil segment between the two first bump foil segments is the second bump foil segment, and along the axial direction, the axial length of the first bump foil segment is greater than the length of the second bump foil segment.

[0050] In this technical solution, the first dividing slit is the one closest to the axial ends of the bump foil element and is located near the axial ends of the second bump foil element. This allows the first dividing slit and the ends of the bump foil element to define multiple first bump foil segments. A second dividing slit is provided between two first dividing slits. There are multiple second dividing slits, and a second bump foil segment is formed between any two dividing slits.

[0051] Furthermore, the length of the first corrugated foil segment is greater than that of the second corrugated foil segment, resulting in greater rigidity at the ends of the corrugated foil and relatively less rigidity in the middle, achieving axially variable rigidity of the corrugated foil. As a result, when the rotor rotates, the first corrugated foil segments at the axial ends of the corrugated foil segment deform less and have greater rigidity than the second corrugated foil segment in the middle. This reduces gas leakage from the ends of the corrugated foil segment, ensures that the gas film pressure effectively supports rotor suspension, and thus improves the bearing capacity of the bearing structure.

[0052] In the above technical solution, further, the distance between any two second separation gaps is equal.

[0053] In this technical solution, the distance between any two second separating slits is equal, and the axial length of the corrugated foil segments formed between any two separating slits is the same. This ensures that the corrugated foil segments in the center of the corrugated foil member are evenly distributed, and the resulting multiple corrugated foil segments have the same stiffness. As can be understood, when multiple support structures support the top foil, they can evenly support the top foil, preventing some support structures from having excessive stiffness, resulting in small deformation and ineffective deformation when supporting the top foil, which could cause a momentary overpressure and lead to collapse and damage. This improves the support structure's load-bearing capacity, ensuring that the support structure can effectively support the top foil, thereby enhancing the stability of the rotor.

[0054] In the above technical solution, further, both ends of any one of the plurality of separation slits are at a preset distance from both radial ends of the bump foil.

[0055] In this technical solution, the multiple separation slits are spaced at predetermined distances from both ends of the second bump foil in the radial direction of the bearing structure. These separation slits do not penetrate the bump foil component, preventing the second bump foil from being segmented by the multiple separation slits, thus ensuring its integrity. Furthermore, after the bump foil component is formed, i.e., after the multiple separation slits are machined, the bump foil component remains a single unit, simplifying installation.

[0056] Specifically, the bump foils are pressed into arched structures, so that the first bump foil has a higher wave height than the second bump foil. The radial ends of the bump foils are then connected so that the bump foils can be arranged circumferentially around the top foil, thereby supporting the top foil.

[0057] Furthermore, fixing holes are provided at both radial ends of the second bump foil. After the bump foil is manufactured, it needs to be placed on the inner wall of the bearing seat, with one end of the bump foil fixed to the bearing seat and the other end installed circumferentially around the top foil, so that the other end of the bump foil overlaps with the first end. In this way, pins are inserted through the fixing holes to secure the two ends of the second bump foil to the bearing seat, completing the installation of the bump foil. This fixing method ensures that the bump foil fits the inner wall of the bearing seat, ensuring the load-bearing performance and life of the bearing structure.

[0058] A second aspect of the present invention provides a motor, including all the beneficial effects of the bearing structure in any of the above technical solutions, which will not be discussed in detail.

[0059] The third aspect of the present invention provides a compressor, including all the beneficial effects of the bearing structure in any of the above technical solutions, which will not be discussed in detail.

[0060] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 A schematic diagram of a radial cross-section of a bearing structure provided in an embodiment of the present application;

[0062] Figure 2 This is a schematic diagram of the structure of the corrugated foil of the bearing structure provided in an embodiment of the present application;

[0063] Figure 3 The second schematic diagram of the structure of the corrugated foil of the bearing structure provided in the embodiment of the present application;

[0064] Figure 4 A schematic diagram of the axial structure of the corrugated foil member of the bearing structure provided in an embodiment of the present application;

[0065] Figure 5 A schematic structural diagram of the top foil and the bump foil of the bearing structure provided in an embodiment of the present application.

[0066] The corresponding relationship between the reference numerals and component names is as follows:

[0067] 100 bearing seat, 200 top foil, 202 accommodating cavity, 300 corrugated foil member, 302 supporting structure, 304 first corrugated foil, 306 second corrugated foil, 308 connecting structure, 310 separation gap, 312 first separation gap, 314 second separation gap. DETAILED DESCRIPTION

[0068] In order to more clearly understand the purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0069] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0070] Refer to the following Figures 1 to 5 A bearing structure according to the present invention is described below, comprising a bearing seat 100, a top foil 200, and a bump foil 300. The top foil 200 is disposed within the bearing seat 100 and defines a housing cavity 202 for accommodating a rotor. The bump foil 300 is disposed within the bearing seat 100, located between the top foil 200 and the bearing seat 100, and includes multiple support structures 302. The top foil 200 has a double-layer cavity structure.

[0071] The present invention provides a bearing structure comprising a bearing seat 100, a first bump foil 304, and a bump foil member 300. A top foil 200 is disposed within the bearing seat 100 and extends circumferentially therefrom to form a housing cavity 202. The housing cavity 202 can accommodate a rotor, which can rotate within the housing cavity 202. It is understood that the top foil 200 can contact the rotor and provide radial support for the rotor. When the rotor rotates, the rotation of the rotor within the housing cavity 202 generates air film pressure, causing the rotor to gradually levitate and rotate. While supporting the rotor, the air film pressure also compresses the top foil 200, allowing the top foil 200 to support the rotor through the air film pressure, effectively supporting the rotor. Furthermore, the bump foil member 300 is also disposed within the bearing seat 100, specifically between the top foil 200 and the bearing seat 100, and includes multiple support structures 302 for supporting the top foil 200. It is understandable that the multiple support structures 302 are located between the top foil 200 and the bearing seat 100, allowing the top foil 200 to contact the multiple support structures 302, thereby enabling the multiple support structures 302 to support the top foil 200 and share the pressure of the top foil 200. Furthermore, when the rotor rotates in the accommodating cavity 202 formed by the top foil 200, as the rotor speed increases, the air film pressure will gradually squeeze toward the top foil 200. When the rotor is lightly loaded, the top foil 200 alone can effectively support the rotor. When the rotor is heavily loaded or encounters an impact, the air film pressure generated by the rotor rotation is high. At this time, the multiple support structures 302 included in the bump foil 300 will support the top foil 200, thereby forming a situation where the top foil 200 and the bump foil 300 jointly support the rotor, thereby ensuring that the rotor can rotate stably.

[0072] Furthermore, the top foil 200 has a double-layer cavity structure. It is understandable that when the top foil 200 has a double-layer cavity structure, when the air film pressure generated by the rotation of the rotor squeezes the top foil 200, the cavity within the top foil 200 will be compressed, thereby improving the damping properties of the top foil 200. In this way, the cavity structure of the top foil 200 can dissipate some of the energy generated by the rotor vibration, ensuring the stable rotation of the rotor while providing effective support for the rotor. Furthermore, when the rotor speed gradually decreases, the air film pressure within the accommodating cavity 202 will also decrease, causing the air film pressure on the top foil 200 to gradually decrease, and the bump foil 300 will gradually return to its initial state, at which point the rotor is supported only by the top foil 200. When the rotor speed continues to decrease (the rotor stops running), the top foil 200 also begins to gradually return to its initial state, and when the rotor completely stops, it returns to its initial state.

[0073] Furthermore, the support structure 302 can also be a double-layer cavity structure. The cavity structure can improve the damping properties of the support structure 302. When it is necessary to support the top foil 200, the multiple support structures 302 of the double-layer cavity structure have greater rigidity. Since the support structure 302 is a double-layer cavity structure, the friction between the upper and lower layers of wave foils forming the cavity is increased, and the friction area between the wave foils is increased, thereby increasing the friction damping, so that it can bear greater pressure. In addition, the cavity structure can further dissipate the vibration energy brought by the rotor through the top foil 200, ensure the stability of the rotor rotation, improve the support capacity of the rotor, and thus improve the bearing capacity of the rotor.

[0074] Furthermore, in one possible scenario, the top foil 200 and the multiple support structures 302 are both double-layer cavity structures, and their operation process is as follows: First, the rotor is started to rotate. During the rotation process, the rotor speed gradually increases, thereby forming an air film pressure. The top foil 200 is squeezed by the air film pressure and begins to deform. Because the top foil 200 has a double-layer cavity structure, as the air film pressure increases, the cavity will be continuously compressed to adapt to the changing air film pressure. The cavity structure also has good damping properties and can absorb the vibration energy generated by the rotor rotation, reducing the impact of vibration energy on the rotor. At this time, the air film pressure is relatively low, and the top foil 200 can support the rotor. When the load of the rotor changes, the air film pressure will also change accordingly. When the air film pressure increases, the top foil 200 cannot effectively support the rotor. At this time, the top foil 200 will transfer the extrusion force to the support structure 302, and the support structure 302 is also a double-layer cavity structure. When the corrugated foil close to the top foil 200 is deformed and contacts the outer corrugated foil, the outer corrugated foil can provide further support. Therefore, the support structure 302 has a high rigidity and can effectively support the top foil 200, preventing the top foil 200 from being squeezed and deformed, thereby ensuring support for the rotor and making the rotor rotate stably.

[0075] When the rotor load increases, its vibration energy also increases and is transmitted to the top foil 200 and the support structure 302 . The cavities of the top foil 200 and the support structure 302 can jointly absorb the vibration energy, thereby reducing the impact of the vibration energy on the rotor.

[0076] Furthermore, in the above scenario, when the rotor speed is low in the early stage, the air film pressure generated is small and cannot support the rotor. The rotor will rotate along the wall of the accommodating cavity 202 in the accommodating cavity 202. Due to factors such as inertia and air film pressure, the rotor will increase the pressure on the position contacting the wall of the accommodating cavity 202. The rotor is supported by the first wave foil 304 and the support structure 302 under pressure to ensure effective support for the rotor.

[0077] Furthermore, the materials of the top foil 200 and the bump foil 300 can be beryllium bronze, nickel-based alloy, high-strength stainless steel, etc. The inner wall of the accommodating cavity 202 formed by the top foil 200 is sprayed with a wear-resistant self-lubricating material.

[0078] The bearing structure provided by the present invention has a top foil 200 formed with a housing cavity 202, within which the rotor can rotate. A support structure 302 is disposed between the top foil 200 and the bearing seat 100, enabling the support structure 302 to support the rotor via the top foil 200. This allows the support structure 302 and the top foil 200 to jointly support the rotor, preventing irreversible deformation and damage caused by excessive bearing capacity of the first wave foil 304. This improves the support force and bearing capacity of the rotor. Furthermore, the top foil 200 has a double-layer cavity structure, which ensures stiffness while increasing damping, enabling it to fully absorb or absorb most of the vibration energy generated by the rotor during rotation, thereby improving the rotor's stability.

[0079] This embodiment provides a bearing structure. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0080] like Figure 1 、 Figure 2 and Figure 3 As shown, the support structure 302 includes a first wave foil 304 and a second wave foil 306. The second wave foil 306 and the first wave foil 304 have a gap in the radial direction of the bearing structure to form a cavity structure. The first wave foil 304 is closer to the top foil 200 than the second wave foil 306. When the top foil 200 is subjected to force to press the first wave foil 304, the first wave foil 304 can move toward the direction close to the first wave foil 304 and abut against the second wave foil 306.

[0081] In this embodiment, the support structure 302 includes a first corrugated foil 304 and a second corrugated foil 306. It is understood that the first corrugated foil 304 and the second corrugated foil 306 together constitute the support structure 302, forming the support structure 302 into a double-layer structure. This improves the stiffness and damping properties of the support structure 302, thereby enhancing the support effect on the rotor.

[0082] Furthermore, a gap is defined between the first corrugated foil 304 and the second corrugated foil 306 in the radial direction of the bearing structure, forming a cavity structure. The first corrugated foil 304 is closer to the top foil 200 than the second corrugated foil 306. As can be appreciated, the cavity structure can enhance the damping force and stiffness of the support structure 302, improving the rotor's support. When the rotor is heavily loaded, the first corrugated foil 304 and the second corrugated foil 306 can jointly support the rotor, ensuring sufficient support and increasing its load capacity.

[0083] Furthermore, the provision of first corrugated foil 304 and second corrugated foil 306 increases the overall rigidity of support structure 302, preventing deformation and failure of support structure 302 and ensuring stable support for the rotor. Furthermore, the cavity structure further absorbs and dissipates the vibration energy generated by the rotating rotor, reducing its impact and ensuring rotor stability.

[0084] Furthermore, when the top foil 200 is subjected to force pressing against the first corrugated foil 304, the first corrugated foil 304 can move toward the first corrugated foil 304 and abut against the second corrugated foil 306. It is understood that when the rotor load is heavy, the top foil 200 will be subjected to force pressing against the first corrugated foil 304, causing the first corrugated foil 304 and the top foil 200 to contact and jointly support the rotor. At this point, if the supporting force of the first corrugated foil 304 and the top foil 200 is sufficient to provide stable support for the rotor, the first corrugated foil 304 will not continue to move toward the second corrugated foil 306, and the rotor will be supported solely by the first corrugated foil 304 and the top foil 200. If the supporting force of the first corrugated foil 304 and the top foil 200 is unable to effectively support the rotor, the first corrugated foil 304 will move toward the second corrugated foil 306 and abut against it. At this time, the top foil 200, the first wave foil 304, and the second wave foil 306 jointly support the rotor, increasing the overall support force, enabling effective support for the rotor and improving the rotor's load capacity. Furthermore, the gap between the first wave foil 304 and the second wave foil 306 is 0.03 mm to 0.12 mm. It is understandable that by reasonably setting the gap between the first wave foil 304 and the second wave foil 306, the stiffness and damping of the support structure 302 can be improved, ensuring the supporting force of the support structure 302. It is understandable that the gap between the first wave foil 304 and the second wave foil 306 should not be too small. If it is less than 0.03 mm, the gap between the first wave foil 304 and the second wave foil 306 will be too small, reducing the damping of the support structure 302 while also reducing the absorption of the rotor's vibration energy, making it impossible to ensure the smooth rotation of the rotor. However, if the gap between the first corrugated foil 304 and the second corrugated foil 306 is greater than 0.12 mm, when the rotor is heavily loaded, the first corrugated foil 304 will be squeezed and irreversibly deformed before it comes into contact with the second corrugated foil 306. This will further damage the top foil 200 and the first corrugated foil 304, rendering them unable to support the rotor. Therefore, setting the gap between the first corrugated foil 304 and the second corrugated foil 306 within the range of 0.03 mm to 0.12 mm can ensure the stiffness and damping properties of the support structure 302, improve the support effect on the rotor, and enhance the rotor's load capacity.

[0085] This embodiment provides a bearing structure. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0086] like Figure 1 and Figure 2 As shown, the ends of the first corrugated foil 304 and the second corrugated foil 306 are disposed close to the bearing seat 100 , and the middle portions of the first corrugated foil 304 and the second corrugated foil 306 protrude toward the top foil 200 .

[0087] In this embodiment, both ends of the first and second corrugated foils 304 and 306 are close to the bearing seat 100 , while the middle portions of the first and second corrugated foils 304 and 306 protrude toward the top foil 200 , forming an arched cavity structure.

[0088] As can be understood, the protruding portions of the first and second corrugated foils 304, 306 have a certain height relative to their ends, forming a cavity between the first and second corrugated foils 304, 306. Thus, when the top foil 200 is pressed against the first corrugated foil 304, the protruding portion of the first corrugated foil 304 first contacts the top foil 200, providing support for the top foil 200. As the compressive force of the first corrugated foil 304 gradually increases, the cavity of the first corrugated foil 304 is gradually compressed, and the first corrugated foil 304 gradually deforms toward the second corrugated foil 306. At this point, the first corrugated foil 304 and the second corrugated foil 306 are in contact, allowing the second and first corrugated foils 306 to jointly support the top foil 200, improving support capacity and thereby providing stable support for the rotor.

[0089] Furthermore, the first and second corrugated foils 304, 306 are arched structures. It is understood that the arched structures formed at both ends and the middle of the first and second corrugated foils 304, 306 gradually deform when squeezed, and their supporting force gradually increases as they deform. This allows the arc-shaped structures to adaptively deform according to changes in the rotor's load, speed, and other factors to ensure effective supporting force, effectively supporting the rotor and improving its stable operation.

[0090] Furthermore, the arched shape also improves the elasticity of the first wave foil 304 and the second wave foil 306. When the load of the rotor is reduced, the first wave foil 304 and the second wave foil 306 can gradually return to the arched shape, ensuring that the rotor can be stably suspended in the accommodating cavity 202, thereby avoiding unstable rotation of the rotor when the load is reduced.

[0091] Furthermore, by arranging both ends of the first wave foil 304 and the second wave foil 306 close to the bearing, and making the middle positions of the first wave foil 304 and the second wave foil 306 protrude in the direction close to the top foil 200, the first wave foil 304 and the second wave foil 306 can increase the supporting force by deformation, and the first wave foil 304 and the second wave foil 306 can adaptively change the supporting force according to the extrusion force received, thereby achieving stable support for the rotor.

[0092] This embodiment provides a bearing structure. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0093] like Figure 1 、 Figure 2 and Figure 3 As shown, the wave height of the first wave foil 304 is greater than the wave height of the second wave foil 306 .

[0094] In this embodiment, the wave height of the first wave foil 304 is greater than the wave height of the second wave foil 306. The first wave foil 304 and the second wave foil 306 are constructed as arc-shaped arch structures, that is, the head shape of the first wave foil 304 and the second wave foil 306 in the radial cross section is an arc segment, and the height of the arc can be understood as the wave height of the first wave foil 304 and the second wave foil 306.

[0095] It is understandable that making the wave height of the first corrugated foil 304 greater than that of the second corrugated foil 306 can improve its bearing effect on the rotor. When the rotor is operating, the air film pressure formed by the rotor will squeeze the top foil 200 against the first corrugated foil 304. Because the wave height of the first corrugated foil 304 is greater than the wave height of the second corrugated foil 306, the first corrugated foil 304 initially supports the top foil 200 and deforms. As the first corrugated foil 304 deforms, its supporting force gradually increases. When the supporting force provided by the first corrugated foil 304 and the top foil 200 is insufficient to support stable rotation of the rotor, the first corrugated foil 304 contacts the second corrugated foil 306, which in turn causes the second corrugated foil 306 to deform and increase the supporting force. In this way, the first corrugated foil 304 and the second corrugated foil 306 jointly support the top foil 200, ensuring support strength and thus achieving stable support for the rotor.

[0096] Because the wave height of the first corrugated foil 304 is greater than that of the second corrugated foil 306, in some cases, the first corrugated foil 304 deforms without contacting the second corrugated foil 306. The supporting force of the first corrugated foil 304 is sufficient to stably support the top foil 200. In this way, the rotor can be supported solely by the first corrugated foil 304 and the top foil 200, preventing the second corrugated foil 306 from also supporting the rotor. This reduces the number of deformations of the second corrugated foil 306 and increases its service life.

[0097] This embodiment provides a bearing structure. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0098] Furthermore, the stiffness of the first wave foil 304 is greater than the stiffness of the second wave foil 306 .

[0099] In this embodiment, the stiffness of the first corrugated foil 304 is less than that of the second corrugated foil 306. It is understood that when the stiffness of the second corrugated foil 306 is greater than that of the first corrugated foil 304, it can prevent the second corrugated foil 306 from undergoing significant deformation, thereby preventing it from collapsing and undergoing irreversible deformation, which would result in an inability to effectively support the rotor. However, when the stiffness of the first corrugated foil 304 is less than that of the second corrugated foil 306, it can undergo significant deformation in response to changes in the load-bearing capacity, ensuring that the first corrugated foil 304 continues to deform when in contact with the second corrugated foil 306, continuously providing support to the top foil 200 and thereby providing stable support for the rotor.

[0100] This embodiment provides a bearing structure. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0101] like Figure 1 、 Figure 2 and Figure 3 As shown, the bump foil 300 further includes a connecting structure 308 for connecting any two adjacent supporting structures 302 among the plurality of supporting structures 302 .

[0102] In this embodiment, the bump foil 300 further includes a connecting structure 308, which can connect two adjacent support structures 302, thereby connecting the multiple support structures 302 via the connecting structure 308. It is understood that the multiple support structures 302 are located between the top foil 200 and the bearing seat 100. The connecting structure 308 can connect the multiple support structures 302 to form a whole, thereby defining the positions of the multiple support members. This ensures that the pressure on the multiple support members is even, preventing some support structures 302 from being subjected to excessive pressure and causing damage.

[0103] Furthermore, a first distance is defined between any two adjacent connecting structures 308. It is understood that by setting the distance between any two adjacent connecting structures 308, the specific size of the support structure 302 can be defined. Furthermore, by properly setting the first distance, the support force of the support structure 302 can be increased. It is worth noting that the first distance should not be too large. When the distance between two adjacent connecting structures 308 is relatively large, the wave height of the support structure 302 will decrease, and the rigidity will also decrease, which will reduce the support force of the support structure 302. Similarly, the first distance should not be too small, as it will result in a higher wave height and greater rigidity for the support structure 302, making deformation more difficult and reducing damping properties. This will result in the support structure 302 not having sufficient compression stroke when subjected to force, and thus being unable to effectively support the top foil 200. Therefore, the first distance should be set within a reasonable range to ensure the rigidity and deformation of the support structure 302, thereby ensuring its support force.

[0104] This embodiment provides a bearing structure. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0105] like Figure 1 、 Figure 2 and Figure 3 As shown, the plurality of support structures 302 are spaced apart along the circumferential direction of the bump foil 300 ; and / or the plurality of support structures 302 extend along the axial direction of the bump foil 300 .

[0106] In this embodiment, multiple support structures 302 are spaced apart along the circumferential direction of the bump foil 300. It will be appreciated that the multiple support structures 302 can support the top foil 200. Evenly distributing the multiple support structures 302 at regular intervals along the circumferential direction of the bump foil 300 ensures uniform contact between the multiple support structures 302 and the top foil 200. The pressure on the top foil 200 can be evenly transmitted to the multiple support structures 302, ensuring that each support structure 302 experiences substantially the same pressure. This improves the support effect of the support structures 302 on the top foil 200, and thereby, on the rotor.

[0107] Furthermore, the spacing between two adjacent support structures 302 in the plurality of support structures 302 can be adjusted as needed. It is understood that when the rotor load in the scenario where the bearing structure is used is relatively small, the number of support structures 302 can be reduced. This, on the one hand, reduces the weight of the bearing structure and optimizes the overall structure of the bearing structure. It can also reduce the material used in the support structures 302 and reduce the cost of use. When the rotor load in the scenario where the bearing structure is used is relatively large, the number of support structures 302 can be increased to disperse the pressure borne by each support structure 302, ensure the supporting force of the support structures 302, prevent the support structures 302 from being crushed or undergoing irreversible deformation, and ensure stable support for the rotor.

[0108] It's worth noting that the number of support structures 302 should not be too small. If this number is too small, a large gap will appear between adjacent support structures 302. The top foil 200 in this gap is not effectively supported, which can easily cause irreversible deformation. This can cause portions of the cavity 202 formed by the top foil 200 to deform toward the support structures 302. In this case, the rotor will collide with the deformed cavity wall during rotation, damaging the rotor and the first wave foil 304 and causing instability during rotor rotation. Therefore, the number of support structures 302 should not be too small.

[0109] Furthermore, multiple support structures 302 extend along the axial direction of the second corrugated foil 306, ensuring that the top foil 200 is always in contact with the support structures 302 in the axial direction. It is understood that the top foil 200 has a certain length in the axial direction to accommodate the rotation of the rotor within the accommodating cavity 202. When the rotor rotates within the accommodating cavity 202, air film pressure is present at all locations within the accommodating cavity 202 in the axial direction. Extending multiple support structures 302 along the axial direction of the second corrugated foil 306 can increase the contact area between the support structures 302 and the top foil 200, thereby increasing the support range of the support structures 302 and effectively supporting all locations of the top foil 200 in the axial direction. Furthermore, the rotor receives uniform axial support force, ensuring that both ends of the rotor can stably float in the center of the accommodating cavity 202, thereby improving the stability of the rotor during operation. This can also increase the critical speed of the rotor and enhance its performance.

[0110] Furthermore, multiple support structures 302 can be staggered in the axial direction. It is understood that staggering multiple support structures 302 can, on the one hand, support the top foil 200 at different angles, dispersing the pressure of the top foil 200 at different angles, thereby effectively supporting the top foil 200 and further ensuring the stability of the rotor during operation. On the other hand, staggering multiple support structures 302 does not create a large gap between two adjacent support structures 302, preventing the top foil 200 from collapsing into the gap. While ensuring support for the top foil 200, it also reduces the number of support structures 302 in the axial direction, reduces the weight of the bearing structure, and reduces the cost of use.

[0111] Furthermore, the axial length of the multiple support structures 302 is equal to the axial length of the top foil 200. It is understandable that if the axial length of the multiple support structures 302 is less than the axial length of the top foil 200, portions of the top foil 200 will not be supported by the support structures 302, thereby reducing the support effect on the rotor. If the axial length of the multiple support structures 302 is greater than the axial length of the top foil 200, on the one hand, the support structures 302 will not provide sufficient support for the top foil 200, which is not conducive to cost control and increases the cost of use. On the other hand, the support structures 302 may interfere with other components or external objects, causing collision damage. Therefore, setting the axial length of the multiple support structures 302 equal to the axial length of the top foil 200 allows the support structures 302 to fully support the top foil 200, avoiding situations where portions of the top foil 200 are not effectively supported, ensuring the support effect on the top foil 200, and thereby improving the support effect on the rotor.

[0112] This embodiment provides a bearing structure. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0113] Furthermore, the top foil 200 further includes: a third wave foil; and a fourth wave foil. A gap is provided between the third wave foil and the fourth wave foil to form a cavity structure.

[0114] In this embodiment, the top foil 200 also includes a third corrugated foil and a fourth corrugated foil. The third and fourth corrugated foils are designed to be separated, with a certain gap between them, forming a cavity structure, thus forming a double-layer cavity structure for the first corrugated foil 304. It can be understood that the certain gap between the third and fourth corrugated foils allows the top foil 200 to have a certain degree of elastic deformation, thereby increasing its bearing capacity and the pressure it can withstand.

[0115] Furthermore, when the rotor works in the accommodating cavity 202, the generated vibration energy will be transmitted to the cavity structure, and the cavity structure can absorb the vibration energy, thereby reducing the impact of the vibration energy on the rotor rotation and improving the stability of the rotor rotation.

[0116] Furthermore, the third wave foil is closer to the rotor than the fourth wave foil, allowing the rotor to directly contact the third wave foil. During rotor startup, the rotor and the third wave foil generate significant friction, causing more severe wear on the third wave foil than on the fourth wave foil, shortening the service life of the third wave foil compared to the fourth wave foil. Therefore, the third and fourth wave foils can be designed to be detachably connected. This allows only the third wave foil to be replaced when the third wave foil is damaged, eliminating the need to replace the entire top foil 200. This saves costs and extends the service life of the top foil 200.

[0117] This embodiment provides a bearing structure. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0118] like Figure 3 and Figure 4 As shown, the bearing structure further includes: a plurality of separation slits 310 , which are spaced apart and distributed on the bump foil 300 along the axial direction of the bearing structure.

[0119] In this embodiment, a plurality of separation slits 310 are spaced apart along the axial direction of the bearing structure and extend through the bump foil member 300, dividing the bump foil member 300 into a plurality of bump foil segments. This further divides the first and second bump foil members 304, 306 into a plurality of bump foil segments. Each bump foil segment includes a plurality of support structures 302, which are used to support the top foil 200. Specifically, the separation slits 310 divide the second bump foil member 306 into a plurality of bump foil segments, each of which includes a plurality of support structures 302. When a support structure 302 is subjected to force, the compressed support structure 302 causes the corresponding bump foil segment to deform, preventing the support structure 302 from being squeezed and deformed. When the pressure is released, the bump foil segments return to their original shape, thereby improving the load-bearing capacity of the support structure 302.

[0120] This embodiment provides a bearing structure. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0121] like Figure 4As shown, the multiple separation slits 310 include: a first separation slit 312, which is a separation slit 310 close to the two axial ends of the bump foil member 300; and a second separation slit 314, which is arranged between the two first separation slits 312. The bump foil segment between the first separation slit 312 and the axial end of the bump foil member 300 is the first bump foil 304 segment, and the bump foil segment between the two first bump foil 304 segments is the second bump foil 306 segment. In the axial direction, the axial length of the first bump foil 304 segment is greater than the length of the second bump foil 306 segment.

[0122] In this embodiment, the first separating slits 312 are the separating slits 310 closest to the axial ends of the bump foil member 300 and are located near the axial ends of the second bump foil 306. This allows the first separating slits 312 and the ends of the bump foil member 300 to define multiple first bump foil 304 segments. A plurality of second separating slits 314 are provided between two first separating slits 312. A second bump foil 306 segment is formed between any two separating slits 310.

[0123] Furthermore, the length of the first corrugated foil segment 304 is greater than that of the second corrugated foil segment 306, resulting in greater rigidity at the ends of the corrugated foil member 300 and relatively less rigidity in the middle, thus achieving axially variable rigidity for the corrugated foil member 300. Thus, when the rotor rotates, the first corrugated foil segments 304 at the axial ends of the corrugated foil member 300 deform less and have greater rigidity than the second corrugated foil segment 306 in the middle of the corrugated foil member 300. This reduces gas leakage from the ends of the corrugated foil member 300, ensures that the gas film pressure effectively supports rotor suspension, and thereby improves the bearing capacity of the bearing structure.

[0124] This embodiment provides a bearing structure. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0125] like Figure 4 and Figure 5 As shown, the distance between any two second separation gaps 314 is equal.

[0126] In this embodiment, the distance between any two second separation slits 314 is equal, and the axial length of the corrugated foil segments formed between any two separation slits 310 is the same, so that the corrugated foil segments in the middle position of the corrugated foil member 300 are evenly distributed, and the stiffness of the multiple corrugated foil segments formed is the same. It can be understood that when the multiple support structures 302 support the top foil 200, the multiple support structures 302 can evenly support the top foil 200, avoiding the situation where the stiffness of some support structures 302 is too high, resulting in a small deformation, so that when supporting the top foil 200, they cannot effectively deform, resulting in a momentary excessive pressure leading to collapse and damage. This improves the load-bearing effect of the support structures 302, ensures that the support structures 302 can effectively support the top foil 200, and thereby improves the stability of the rotor.

[0127] This embodiment provides a bearing structure. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0128] like Figure 5 As shown, two ends of any one of the plurality of separation slits 310 are respectively at a preset distance from two radial ends of the bump foil 300 .

[0129] In this embodiment, the multiple separation slits 310 are spaced a predetermined distance apart from the ends of the second bump foil 306 in the radial direction of the bearing structure. The multiple separation slits 310 do not penetrate the bump foil 300, preventing the second bump foil 306 from being segmented by the multiple separation slits 310. This ensures the integrity of the second bump foil 306. Furthermore, after the bump foil 300 is formed, i.e., after the multiple separation slits 310 are machined, the bump foil 300 remains a single, integrated structure, simplifying installation. Specifically, the bump foil 300 is formed into an arched structure, ensuring that the first bump foil 304 has a greater corrugation height than the second bump foil 306. The radial ends of the bump foil 300 are then connected, allowing the bump foil 300 to be positioned circumferentially around the top foil 200, thereby providing support for the top foil 200.

[0130] Furthermore, fixing holes are provided at both radial ends of the second bump foil 306. After the bump foil 300 is manufactured, it needs to be placed on the inner wall of the bearing seat 100, with one end of the bump foil 300 fixed to the bearing seat 100 and the other end installed circumferentially around the top foil 200, so that the other end of the bump foil 300 overlaps with the first end. In this way, pins are inserted through the fixing holes to secure the two ends of the second bump foil 306 to the bearing seat 100, completing the installation of the bump foil 300. This fixing method allows the bump foil 300 to fit closely to the inner wall of the bearing seat 100, ensuring the load-bearing performance and life of the bearing structure.

[0131] A second aspect of this embodiment provides a motor, including all the beneficial effects of the bearing structure in any of the above embodiments, which will not be discussed in detail.

[0132] The third aspect of this embodiment provides a compressor, including all the beneficial effects of the bearing structure in any of the above embodiments, which will not be discussed in detail. Specific embodiment:

[0134] The development of low-carbon refrigeration equipment is imperative. The refrigeration compressor is a core component of the refrigeration system. Traditionally, the sliding bearings in refrigeration compressors have been lubricated with oil, but its high viscosity generates significant frictional power loss at high speeds. Furthermore, the presence of oil can affect the heat transfer efficiency of the heat exchanger over time, degrading refrigeration system performance. Magnetic bearings offer the advantages of low friction loss and excellent stability, but their high cost makes them less advantageous in small and medium-sized compressor applications.

[0135] Hydrodynamic gas bearings offer the advantages of high speed, high efficiency, and low friction loss, making them ideal for small and medium-sized compressors. Foil hydrodynamic gas bearings are divided into radial and axial foil hydrodynamic gas bearings. Radial foil hydrodynamic gas bearings are used to support radial suspension of the rotor, while axial foil hydrodynamic gas bearings are used to support axial suspension and prevent axial movement. Radial foil bearings consist of a radial bearing seat, a radial bearing corrugated foil, a radial bearing top foil, and a fixing pin. When the rotor rotates at high speed, gas is introduced, squeezed to form a high-pressure gas film, which radially suspends the rotor. However, air bearings have poor operational stability due to their low gas viscosity, high leakage, and low load-bearing capacity. Furthermore, hydrodynamic gas bearings also have low stiffness and damping, resulting in low stability.

[0136] This embodiment provides a bearing structure, wherein the corrugated foil member 300 adopts a double-layer non-uniform height corrugated foil structure, wherein the wave height of the first corrugated foil 304 is 0.03 mm to 0.12 mm higher than the wave height of the second corrugated foil 306; under light load, only the first corrugated foil 304 performs supporting work, at which time the single-layer corrugated foil supporting the corrugated foil is easily deformed, and the structural damping is high, which can effectively dissipate the energy caused by the rotor vibration and ensure the stability of the rotor; under heavy load or impact, the wave height of the first corrugated foil 304 is lowered to the same level as the wave height of the second corrugated foil 306, and at this time, it is jointly supported by two raised corrugated foils, which can achieve high support stiffness, ensure that the corrugated foil is not crushed or irreversibly deformed, and can increase the critical speed of the rotor, ensuring the stability and impact resistance of the rotor during high-speed operation.

[0137] Furthermore, in order to reduce the gas leakage of the bearing structure and realize the reasonable layout of the bearing structure support stiffness in the axial direction, the two layers of corrugated foil in this embodiment are designed with non-uniform width axial segments, such as Figure 4As shown, the corrugated foil 300 is axially divided into several sections, wherein the two sections on both sides are short and the sections in the middle are evenly distributed. This structure realizes that the corrugated foil in the middle sections has low stiffness and the corrugated foil on both sides has high stiffness, thereby realizing axial variable stiffness. When the bearing structure is working, the deformation of the foil on both sides is smaller than that in the middle, which can reduce the leakage of gas from both ends, thereby increasing the air film pressure in the middle of the foil, and thus improving the overall bearing capacity of the radial bearing structure.

[0138] Both ends of the bump foil 300 of this embodiment are integral structures and are not divided into segments, thereby ensuring the integrity of the bump foil.

[0139] The bearing seat 100 of this embodiment is a finely machined bearing sleeve with two grooves and fixed pin holes on the top for fixing the top foil 200 and the bump foil 300.

[0140] Furthermore, the top foil 200 and the bump foil 300 can be made of beryllium bronze, nickel-based alloy, high-strength stainless steel and other foils, wherein the inner wall of the bump foil 300 is sprayed with wear-resistant self-lubricating material. Figure 4 As shown, the foil is divided into several sections in the middle during wire cutting. The foils on both sides are wide and the middle sections are narrow. A section is left uncut on the left and right ends of the foil to ensure the integrity of the foil and facilitate installation after subsequent forming. The wire-cut foils are pressed into foils. Figure 3 As shown, each of the first wave foil 304 and the second wave foil 306 is arched and wavy, and then the two long strips of arched foil are respectively rolled into rings.

[0141] Furthermore, one end of the top foil 200 and the bump foil piece 300 is fixed to the bearing seat 100 through the fixing holes and the fixing pins, and one end of the top foil 200 and the bump foil piece 300 is fixed to the bearing seat 100 through the fixing holes and the fixing pins. This fixing method can ensure the degree of fit between the top foil 200 and the bump foil piece 300 on the inner wall of the bearing seat 100, thereby avoiding affecting the bearing performance and life due to poor fit.

[0142] This embodiment adopts a double-layer top foil 200 to improve the rigidity of the top foil 200 and reduce the difference in radial deformation of the top foil 200. In the related art, the deformation of the top foil 200 between two wave heights is large and it is easy to sink outward, resulting in a larger gap between the top foil 200 and the rotor between the two wave heights, affecting the wedge extrusion effect, resulting in small local pressure and low overall bearing capacity. The double-layer top foil 200 of this embodiment effectively solves this problem by reducing the difference between the radial deformation of the top foil at the peak and trough positions, thereby improving the overall bearing capacity of the foil.

[0143] This embodiment increases the number of foils, thereby doubling the friction area between the foils, thereby greatly improving the friction damping of the bearing structure and improving the stability of the bearing.

[0144] In the description of the present invention, the term "plurality" refers to two or more than two. Unless otherwise expressly defined, the orientations or positional relationships indicated by the terms "upper" and "lower" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention. The terms "connect," "install," and "fix" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the terms in the present invention can be understood according to the specific circumstances.

[0145] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0146] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A bearing structure, characterized in that: The bearing structure comprises: bearing housing; a top foil disposed in the bearing seat, wherein the top foil forms an accommodating cavity for accommodating a rotor; A bump foil is provided in the bearing seat, the bump foil is located between the top foil and the bearing seat, and the bump foil includes a plurality of supporting structures; Wherein, the top foil is a double-layer cavity structure; The bearing structure further comprises: a plurality of separation slits, wherein the plurality of separation slits are spaced apart and distributed on the bump foil along the axial direction of the bearing structure; The plurality of separation gaps include: a first separation slit, the first separation slit being a separation slit close to both ends of the corrugated foil along the axial direction; a second dividing slit, the second dividing slit being arranged between the two first dividing slits; The corrugated foil segment between the first separation gap and the axial end of the corrugated foil member is a first corrugated foil segment, and the corrugated foil segment between two of the first corrugated foil segments is a second corrugated foil segment. In the axial direction, the length of the first corrugated foil segment is greater than the length of the second corrugated foil segment. The distance between any two of the second separating slits is equal; The top foil further comprises: third wave foils; a fourth wave foil, wherein a gap is provided between the third wave foil and the fourth wave foil to form a cavity structure, the third wave foil is closer to the rotor than the fourth wave foil, and the third wave foil and the fourth wave foil are detachably connected; Two ends of any one of the plurality of separation slits are respectively at preset distances from two radial ends of the bump foil.

2. The bearing structure according to claim 1, characterized in that: The support structure includes First wave of foils; a second corrugated foil, wherein a gap is formed between the second corrugated foil and the first corrugated foil in a radial direction of the bearing structure to form a cavity structure, and the first corrugated foil is closer to the top foil than the second corrugated foil; Wherein, when the top foil is pressed against the first corrugated foil, the first corrugated foil can move toward the second corrugated foil and abut against the second corrugated foil.

3. The bearing structure according to claim 2, characterized in that: Ends of the first corrugated foil and the second corrugated foil are arranged close to the bearing seat, and middle portions of the first corrugated foil and the second corrugated foil protrude toward the top foil.

4. The bearing structure according to claim 2, characterized in that: The wave height of the first wave foil is greater than the wave height of the second wave foil.

5. The bearing structure according to claim 2, characterized in that: The stiffness of the first wave foil is greater than the stiffness of the second wave foil.

6. The bearing structure according to claim 2, characterized in that: The bump foil also includes: The connecting structure is used to connect any two adjacent supporting structures among the multiple supporting structures.

7. The bearing structure according to claim 2, characterized in that: The plurality of support structures are spaced apart and distributed along the circumferential direction of the bump foil; and / or The plurality of support structures extend along the axial direction of the bump foil.

8. A motor, characterized in that: The motor comprises: The bearing structure according to any one of claims 1 to 7; The rotor is arranged in the accommodating cavity.

9. A compressor, characterized in that: The compressor comprises: The bearing structure according to any one of claims 1 to 7; or The motor as claimed in claim 8.

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