Dynamic gas bearing and compressor

Abstract

This invention provides a dynamic pressure gas radial bearing and a compressor. The dynamic pressure gas radial bearing includes a housing with a shaft hole and a foil assembly disposed within the shaft hole. The foil assembly includes a top foil and a separable corrugated foil component. The separable corrugated foil component is located between the top foil and the housing and has corrugated foils spaced circumferentially along the shaft hole. It also includes a movable support assembly movably disposed between the housing and the corrugated foils. The movable support assembly is configured to drive the corrugated foils to roll relative to the top foil when the top foil is subjected to pressure that causes deformation. Through the action of the movable support assembly, this invention allows the corrugated foils to obtain a shape adapted to the current load condition, meeting the deformation requirements under different loads, reducing the stress during corrugated foil deformation, and improving the operational reliability of the bearing structure.

Description

Technical Field

[0001] This invention relates to the field of bearing technology, and in particular to hydrodynamic gas radial bearings and compressors. Background Technology

[0002] Hydrodynamic gas bearings are increasingly widely used in high-speed rotating machinery due to their oil-free operation, frictionless operation, and ease of maintenance. Hydrodynamic radial gas bearings are primarily used for radial support of high-speed rotors, bearing the rotor's weight and external radial loads to achieve the rotor's radial load-bearing function.

[0003] Dynamic pressure gas radial bearings mainly consist of corrugated foils and top foils. When the top foil is under stress, the corrugated foil deforms, absorbing the vibrational energy of the gas film, reducing rotor vibration during operation, and improving rotor stability. Currently, most corrugated foils adopt an integral structure, that is, multiple waveforms are pressed onto a single top foil to form the corrugated foil. When one waveform deforms, due to the influence of the continuous structure of the corrugated foil, other waveforms will also deform accordingly, thus affecting the reliability of the bearing structure.

[0004] To address this issue, some corrugated foils employ a separate structure, with each foil installed and fixed independently. During operation, the deformation of each foil is less affected by the deformation of other foils. However, existing separate-structure corrugated foils cannot meet the requirements for different foil shapes under varying loads.

[0005] Therefore, how to design a hydrodynamic gas radial bearing that can adapt to different load conditions is a technical problem that the industry urgently needs to solve. Summary of the Invention

[0006] The purpose of this invention is to provide a dynamic pressure gas radial bearing and a compressor to solve the problem that existing dynamic pressure gas radial bearings are difficult to adapt to different load conditions.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] In a first aspect, the present invention provides a hydrodynamic gas radial bearing, comprising a housing having a shaft hole and a foil assembly disposed within the shaft hole. The foil assembly includes a top foil and a separable corrugated foil component. The separable corrugated foil component is located between the top foil and the housing and has corrugated foils spaced circumferentially along the shaft hole. The invention also includes a movable support assembly movably disposed between the housing and the corrugated foils. The movable support assembly is configured to cause the corrugated foils to roll relative to the top foil when the top foil is subjected to force to compress the corrugated foils and cause them to deform.

[0009] Beneficial Effects: This invention employs a separate corrugated foil component for hydrodynamic gas radial bearings, meaning each corrugated foil is independently configured. This ensures that when a single corrugated foil deforms under stress, it does not affect the structural state of other corrugated foils, effectively avoiding the chain deformation problem that easily occurs with integral corrugated foils. Simultaneously, this invention also equips each corrugated foil with a corresponding movable support assembly. This movable support assembly is configured to cause the corrugated foil to roll relative to the top foil when the top foil is compressed and deformed. Through the action of the movable support assembly, the contact position between the corrugated foil and the top foil changes, and the support height and curvature of the corrugated foil on the top foil are adjusted accordingly. This allows the corrugated foil to obtain a shape adapted to the current load condition, meeting the deformation requirements under different loads, reducing the stress during corrugated foil deformation, and improving the operational reliability of the bearing structure.

[0010] Furthermore, the movable support assembly includes a first rolling element with a first slot and a second rolling element with a second slot. The two ends of the corrugated foil are respectively inserted into the first slot and the second slot, and a protruding body is formed between the two ends to abut against the top foil.

[0011] Beneficial effects: By setting a pair of rolling elements, namely the first rolling element and the second rolling element, not only can the corrugated foil be effectively supported, but also when the corrugated foil is subjected to load and deforms, the rolling of the pair of rolling elements can help the corrugated foil to adaptively adjust its support shape, so that the corrugated foil presents a shape that is adapted to the current load condition, thereby meeting the deformation requirements under different loads.

[0012] Furthermore, the movable support assembly also includes a first elastic reset member and / or a second elastic reset member. The first elastic reset member is connected to the first rolling member, and the deformation direction of the first elastic reset member is the same as the movement direction of the central axis of the first rolling member when it rolls. The second elastic reset member is connected to the second rolling member, and the deformation direction of the second elastic reset member is the same as the movement direction of the central axis of the second rolling member when it rolls.

[0013] Beneficial effects: By setting up elastic reset components, namely the first elastic reset component and the second elastic reset component, the first and second rolling components can be assisted in completing the reset when the load decreases, ensuring that the corrugated foil can smoothly deform or return to its initial shape with the load change, and avoiding the corrugated foil from being unable to deform and reset normally due to the rolling component jamming.

[0014] Furthermore, the housing is provided with mounting grooves circumferentially spaced along the shaft hole. The mounting groove has a groove body and a first groove extension and a second groove extension located on both sides of the groove body. A first rolling element is movably disposed in the first groove extension, a second rolling element is movably disposed in the groove body, and a second elastic reset element is fixedly disposed in the second groove extension.

[0015] Beneficial effects: By providing a mounting groove for the housing, this mounting groove is composed of a groove body, a first groove extension, and a second groove extension. The first and second groove extensions define the mounting positions of the first rolling element and the second elastic reset element. Simultaneously, the groove body provides rolling space for the two rolling elements. This structure simplifies the number of parts in the movable support assembly, allowing the reset action to be achieved solely through the second elastic reset element in conjunction with the two rolling elements. When the corrugated foil is under load, causing the first and second rolling elements to roll, the second rolling element compresses the second elastic reset element, causing it to deform. After unloading, the second elastic reset element pushes the second rolling element back, thereby synchronously resetting the first rolling element, thus completing the shape restoration of the corrugated foil. The operation is smooth and reliable.

[0016] Furthermore, the housing is provided with a first mounting groove and a second mounting groove that are circumferentially alternately distributed along the shaft hole. The first mounting groove has a first groove body and a third groove extension that are connected. The second mounting groove has a second groove body and a fourth groove extension that are connected. A first rolling element is movably disposed in the first groove body. A first elastic reset element is fixedly disposed in the third groove extension. A second rolling element is movably disposed in the second groove body. A second elastic reset element is fixedly disposed in the fourth groove extension.

[0017] Beneficial effects: By providing the housing with independent first and second mounting slots, the first mounting slot is composed of a first groove body and a third groove extension, while the second mounting slot is composed of a second groove body and a fourth groove extension. The first groove body and the third groove extension define the mounting positions of the first rolling element and the first elastic reset element, while the second groove body and the fourth groove extension define the mounting positions of the second rolling element and the second elastic reset element, thus making the synchronous rolling of the first and second rolling elements more precise. Simultaneously, the two elastic reset elements provide elastic reset force synchronously, resulting in a stronger reset driving force. Even if one elastic reset element experiences performance degradation, the other elastic reset element can still provide sufficient reset thrust, further improving operational reliability and making it more suitable for applications with large load fluctuations.

[0018] Furthermore, both the first elastic reset component and the second elastic reset component are elastic rubber components.

[0019] Beneficial effects: Compared to springs, elastic rubber parts have lower production costs, are easier to process and mold, and can directly fit the surface of the mounting groove and rolling parts. They do not produce abnormal noises from metal collisions during cushioning, and can also avoid the problem of spring corrosion and jamming after long-term use. They are suitable for the clean and low-vibration working requirements of gas bearings.

[0020] Furthermore, a first included angle θ1 is formed between the line connecting the center distances of the first rolling element and the second rolling element and the first slot, and a second included angle θ2 is formed between the line connecting the center distances of the first rolling element and the second rolling element and the first slot, with both θ1 and θ2 being within the range of 30 degrees to 90 degrees.

[0021] Beneficial effects: By setting the first included angle θ1 and the second included angle θ2 within the range of 30 degrees to 90 degrees, it can not only adapt to the load requirements of bearing stiffness under most conventional working conditions, but also avoid the problem of insufficient buffering and shock absorption caused by excessively small included angles. At the same time, it can also prevent the bearing stiffness from being too low due to excessively large included angles, which would not provide sufficient support force and affect the structural stability of the bearing. While ensuring the working stability of the bearing, it also broadens the applicable scenarios of the bearing.

[0022] Furthermore, the center distance L between the first rolling element and the second rolling element is in the range of 5mm to 20mm.

[0023] Beneficial effects: By setting the center distance L within the range of 5mm to 20mm, it can cover the bearing stiffness requirements of different loads in most conventional working scenarios. It can avoid the problem of excessive bearing stiffness due to excessively small center distance, which reduces the buffering and shock absorption capacity and easily causes vibration and impact during operation. It can also prevent the bearing stiffness from being too low due to excessively large center distance, which can lead to structural instability due to inability to withstand the working load. Under the premise of ensuring stable operation of the bearing, it can adapt to a variety of application requirements from conventional small loads to medium to large loads, thus improving the adaptability and practicality of the hydrodynamic gas radial bearing.

[0024] Furthermore, the housing is provided with a connected flat foil slot and a fixing slot. The two ends of the top foil are a free end and a fixed end, respectively. The fixed end is inserted into the flat foil slot, and the fixing slot is provided with a fixing pin that abuts against the fixed end.

[0025] Beneficial effects: By inserting the fixed end of the top foil into the flat foil slot of the housing, and simultaneously inserting a fixing pin into the fixing slot of the housing, the top foil is secured, preventing it from moving during operation. Furthermore, the free end of the top foil can be extended to a certain extent, thereby improving its load-bearing capacity.

[0026] Secondly, the present invention also provides a compressor, including a rotor with a rotating shaft and a dynamic pressure gas radial bearing as described above, the dynamic pressure gas radial bearing being sleeved on the rotating shaft.

[0027] Beneficial Effects: This invention employs a separate corrugated foil component for the dynamic pressure gas radial bearing, meaning each corrugated foil is independently configured. This ensures that when a single corrugated foil deforms under stress, it does not affect the structural state of other corrugated foils, effectively avoiding the chain deformation problem that easily occurs with integral corrugated foils. Simultaneously, this invention also equips each corrugated foil with a corresponding movable support assembly. This movable support assembly is configured to cause the corrugated foil to roll relative to the top foil when the top foil is compressed and deformed. Through the action of the movable support assembly, the contact position between the corrugated foil and the top foil changes, and the support height and curvature of the corrugated foil on the top foil are adjusted accordingly. This allows the corrugated foil to obtain a shape adapted to the current load condition, meeting the deformation requirements under different loads, reducing the stress during corrugated foil deformation, and improving the operational reliability of the bearing structure. Therefore, the operating stability and service life of the compressor of this invention are also simultaneously improved. Attached Figure Description

[0028] The present invention will now be described in detail with reference to the embodiments and accompanying drawings, wherein:

[0029] Figure 1 This is an exploded view of a hydrodynamic gas radial bearing.

[0030] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;

[0031] Figure 3 This is a side view of the hydrodynamic gas radial bearing.

[0032] Figure 4 for Figure 3 Enlarged structure at point B Figure 1 ;

[0033] Figure 5 for Figure 3 Enlarged structure at point B Figure 2 ;

[0034] Figure 6 for Figure 3 Enlarged structural diagram at point C;

[0035] Figure 7 Side view of the housing in a hydrodynamic gas radial bearing Figure 1 ;

[0036] Figure 8 for Figure 7 Enlarged structural diagram at point D;

[0037] Figure 9 Side view of the housing in a hydrodynamic gas radial bearing Figure 2 ;

[0038] Figure 10 for Figure 9 Enlarged structural diagram at point E in the middle;

[0039] Figure 11 This is a three-dimensional structural diagram of the top foil in a hydrodynamic gas radial bearing;

[0040] Figure 12 This is a schematic diagram illustrating the deformation of the corrugated foil in a dynamic pressure gas radial bearing.

[0041] Explanation of reference numerals in the attached figures:

[0042] 10. Shell;

[0043] 100. Mounting groove; 1001. Groove body; 1002. First groove extension; 1003. Second groove extension;

[0044] 101. First mounting groove; 1011. First groove body; 1013. Third groove extension;

[0045] 102. Second mounting groove; 1021. Second groove body; 1024. Fourth groove extension;

[0046] 103. Shaft hole; 104. Flat foil slot; 105. Fixing slot;

[0047] 20. Foil assembly;

[0048] 21. Top foil; 210. Arc-shaped main body; 211. Fixed end; 212. Free end;

[0049] 22. Corrugated foil; 220. Raised body;

[0050] 30. Activity support components;

[0051] 301, First rolling element; 3011, First slot;

[0052] 302, Second rolling element; 3021, Second slot;

[0053] 303. Second elastic reset component;

[0054] 40. Fixing pin. Detailed Implementation

[0055] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and are not intended to limit the present invention.

[0056] Hydrodynamic gas bearings are increasingly widely used in high-speed rotating machinery due to their oil-free operation, frictionless operation, and ease of maintenance. Hydrodynamic radial gas bearings are primarily used for radial support of high-speed rotors, bearing the rotor's weight and external radial loads, thus achieving the radial load-bearing function of the rotor.

[0057] Dynamic pressure gas radial bearings mainly consist of corrugated foils and top foils. When the top foil is under stress, the corrugated foil deforms, absorbing the vibrational energy of the gas film, reducing rotor vibration during operation, and improving rotor stability. Currently, most corrugated foils adopt an integral structure, that is, multiple waveforms are pressed onto a single top foil to form the corrugated foil. When one waveform deforms, due to the influence of the continuous structure of the corrugated foil, other waveforms will also deform accordingly, thus affecting the reliability of the bearing structure.

[0058] To address this issue, some corrugated foils employ a separate structure, with each foil installed and fixed independently. During operation, the deformation of each foil is less affected by the deformation of other foils. However, existing separate-structure corrugated foils have a single, unchangeable shape for each foil, making it difficult to meet the requirements for different foil shapes under varying loads.

[0059] Based on this, the dynamic pressure gas radial bearing and compressor provided by the present invention not only have each corrugated foil installed and fixed independently, but also the shape of each corrugated foil can be changed to adapt to different load conditions, thereby improving the reliability of the bearing structure operation.

[0060] In some embodiments, such as Figures 1 to 4 , Figure 7 As shown, the hydrodynamic gas radial bearing provided by the present invention includes a housing 10 with a shaft hole 103 and a foil assembly 20 disposed within the shaft hole 103. The foil assembly 20 includes a top foil 21 and a separable corrugated foil component. The separable corrugated foil component is located between the top foil 21 and the housing 10 and has corrugated foils 22 spaced circumferentially along the shaft hole 103. Simultaneously, the hydrodynamic gas radial bearing also includes a movable support assembly 30 movably disposed between the housing 10 and the corrugated foils 22. The movable support assembly 30 is configured to cause the corrugated foils 22 to roll relative to the top foil 21 when the top foil 21 is subjected to pressure that deforms the corrugated foils 22.

[0061] This invention employs a separate corrugated foil component for hydrodynamic gas radial bearings, meaning each corrugated foil 22 is independently configured. This ensures that when a single corrugated foil 22 deforms under stress, it does not affect the structural state of other corrugated foils 22, effectively avoiding the chain deformation problem that easily occurs with integral corrugated foils 22. Simultaneously, this invention also equips each corrugated foil 22 with a corresponding movable support assembly 30. This movable support assembly 30 is configured to cause the corrugated foil 22 to roll relative to the top foil 21 when the top foil 21 compresses it. Through the action of the movable support assembly 30, the contact position between the corrugated foil 22 and the top foil 21 changes, and the support height and curvature of the corrugated foil 22 on the top foil 21 are adjusted accordingly. This allows the corrugated foil 22 to obtain a shape adapted to the current load condition, meeting the deformation requirements under different loads, reducing the stress during corrugated foil 22 deformation, and improving the operational reliability of the bearing structure.

[0062] It should be noted that the number of corrugated foil sheets 22 in the detachable corrugated foil component can be flexibly set according to actual needs, and is not limited here. The number of movable support components 30 is the same as the number of corrugated foil sheets 22, and can also be flexibly adjusted according to actual needs, and is not limited here either.

[0063] In addition, the housing 10 is cylindrical, and its interior has a shaft hole 103 for the rotating shaft to pass through. Although the foil assembly 20 is installed in the shaft hole 103, its overall thickness is relatively thin and will not affect the insertion of the rotating shaft.

[0064] In practical use, the hydrodynamic gas radial bearing is fitted onto the rotor shaft, with a clearance fit between the shaft and the bearing. The clearance between them is used to form a gas film. During operation, the shaft rotates at high speed under the influence of an electromagnetic field. When the speed reaches a preset value, the hydrodynamic gas radial bearing forms a gas film through the hydrodynamic effect, suspending the shaft in the air.

[0065] In some embodiments, such as Figure 1 , Figure 2 and Figure 4 As shown, the movable support assembly 30 includes a first rolling element 301 with a first slot 3011 and a second rolling element 302 with a second slot 3021. The two ends of the corrugated foil 22 are respectively inserted into the first slot 3011 and the second slot 3021, and a protruding body 220 that abuts against the top foil 21 is formed between the two ends.

[0066] It should be noted that the corrugated foil 22 has a raised body 220, which can be manufactured in the following two ways:

[0067] Method 1: The corrugated foil 22 is flat in its natural state and convex in use. Specifically, the two ends of the flat foil are inserted into the first rolling element 301 and the second rolling element 302 respectively, causing the foil to bend naturally, forming a corrugated foil 22 with a protruding main body 220. This method is particularly suitable for corrugated foil 22 with a small degree of bending.

[0068] Method 2: The planar foil is preheated and bent to form a corrugated foil 22 with a raised body 220, and then the two ends of the corrugated foil 22 are respectively inserted into the first rolling member 301 and the second rolling member 302. This method is particularly suitable for corrugated foil 22 with a large degree of bending.

[0069] Compared to method two, method one involves individually mounting each planar foil sheet into a pair of rolling elements, eliminating the need for stamping dies and effectively reducing manufacturing costs.

[0070] Furthermore, after the hydrodynamic gas radial bearing is assembled, in the initial state, the middle position of the protruding body 220 in the corrugated foil 22 abuts against the top foil 21. By driving the corrugated foil 22 to roll relative to each other through the movable support assembly 30, the middle position of the protruding body 220 of the corrugated foil 22 can move and rotate within a small range relative to the top foil 21 in the deformed state, thereby making the support height and support arc of the corrugated foil 22 on the top foil 21 match the deformation of the corrugated foil 22.

[0071] During operation, the top foil 21 is subjected to varying film force, which is transmitted to the corrugated foil 22. The corrugated foil 22 deforms and absorbs the vibrational energy of the film force, thereby stabilizing the bearing structure. Simultaneously with the deformation of the corrugated foil 22, the synchronous rolling of the first rolling element 301 and the second rolling element 302 drives the corrugated foil 22 to roll relative to the top foil 21, allowing the corrugated foil 22 to acquire a shape adapted to the current load conditions. This satisfies the deformation requirements under different loads, reduces the stress during deformation of the corrugated foil 22, and improves the operational reliability of the bearing structure.

[0072] Therefore, by providing a pair of rolling elements, namely the first rolling element 301 and the second rolling element 302, the present invention not only provides effective support for the corrugated foil 22, but also allows the corrugated foil 22 to adaptively adjust its support shape by rolling the pair of rolling elements when it is subjected to load and deforms. This allows the corrugated foil 22 to present a shape adapted to the current load condition, thereby meeting the deformation requirements under different loads. In this way, the problem of existing separate corrugated foil structures having a single, unchangeable shape for each corrugated foil 22, making it difficult to meet the different shape requirements of the corrugated foil 22 under different loads, can be solved.

[0073] In some embodiments, such as Figures 1 to 4 , Figures 7 to 10As shown, the movable support assembly 30 further includes a first elastic reset member and / or a second elastic reset member 303. The first elastic reset member is connected to the first rolling member 301, and the deformation direction of the first elastic reset member is the same as the movement direction of the central axis when the first rolling member 301 rolls. The second elastic reset member 303 is connected to the second rolling member 302, and the deformation direction of the second elastic reset member 303 is the same as the movement direction of the central axis when the second rolling member 302 rolls.

[0074] It should be noted that the number of the first elastic reset member and the second elastic reset member 303 can be flexibly set according to actual needs.

[0075] In a first alternative embodiment, only one first elastic reset member is provided, which abuts against the side of the first rolling member 301 facing away from the second rolling member 302, while no second elastic reset member 303 is provided.

[0076] In the second alternative embodiment, only one second elastic reset member 303 is provided, which abuts against the side of the second rolling member 302 facing away from the first rolling member 301, and no first elastic reset member is provided.

[0077] In the third alternative embodiment, one first elastic reset member and one second elastic reset member 303 are each provided. The first elastic reset member abuts against the side of the first rolling member 301 facing the second rolling member 302, and the second elastic reset member 303 abuts against the side of the second rolling member 302 facing away from the first rolling member 301.

[0078] In the fourth alternative embodiment, there are two first elastic reset members and two second elastic reset members 303. The two first elastic reset members abut against both sides of the first rolling member 301, and the two second elastic reset members 303 abut against both sides of the second rolling member 302.

[0079] During operation, if the top foil 21 is pressed against the corrugated foil 22, causing deformation of the corrugated foil 22, the corrugated foil 22 can be rolled relative to the top foil 21 by the synchronous forward rolling of the first rolling member 301 and the second rolling member 302. This allows the corrugated foil 22 to deform smoothly, reducing the stress on the corrugated foil 22 during deformation. Simultaneously, if the first rolling member 301 rolls towards the first elastic reset member, the first elastic reset member will deform to a certain extent; similarly, if the second rolling member 302 rolls towards the second elastic reset member 303, the second elastic reset member 303 will also deform to a certain extent. When the load decreases or even disappears, the first rolling member 301 and the second rolling member 302 can be synchronously rolled in opposite directions by the first elastic reset member and / or the second elastic reset member 303, allowing the corrugated foil 22 to return to its initial state.

[0080] Therefore, by incorporating elastic reset components, namely the first elastic reset component and the second elastic reset component 303, this invention can assist the first rolling element 301 and the second rolling element 302 in resetting when the load decreases. This ensures that the corrugated foil 22 can smoothly deform or return to its initial shape with changes in load, preventing the corrugated foil 22 from failing to deform and reset properly due to jamming of the rolling elements. Simultaneously, it can also buffer the impact stress during the deformation process of the corrugated foil 22, improving the overall structural stability of the hydrodynamic gas radial bearing and extending its service life.

[0081] Of course, in other alternative embodiments, the rolling element itself can be designed to roll when subjected to force and return to its initial state when the force is removed.

[0082] In one alternative embodiment, such as Figures 1 to 4 , Figures 7 to 8 As shown, the movable support assembly 30 consists of a first rolling element 301, a second rolling element 302, and a second elastic reset element 303. Meanwhile, the housing 10 has mounting grooves 100 spaced circumferentially along the shaft hole 103. Each mounting groove 100 has a groove body 1001 and a first groove extension 1002 and a second groove extension 1003 located on both sides of the groove body 1001. The first rolling element 301 is movably disposed within the first groove extension 1002, the second rolling element 302 is movably disposed within the groove body 1001, and the second elastic reset element 303 is fixedly disposed within the second groove extension 1003.

[0083] It should be noted that the shape of the first groove extension 1002 is adapted to the shape of the first rolling element 301, and the shape of the second groove extension 1003 is adapted to the shape of the second elastic reset element 303. Preferably, the first rolling element 301 is cylindrical, and the second elastic reset element 303 is quadrangular prism. In this case, the first groove extension 1002 has an arc-shaped groove wall, and the second groove extension 1003 has a polygonal groove wall.

[0084] When the corrugated foil 22 is in its initial state, the first rolling element 301 is located in the mounting groove 100 and is in close contact with the first groove extension 1002; the second elastic reset element 303 is located in the mounting groove 100 and is in close contact with the second groove extension 1003; the second rolling element 302 is located in the groove body 1001 of the mounting groove 100 and is in contact with the second elastic reset element 303, and at this time the second elastic reset element 303 does not deform.

[0085] When the corrugated foil 22 is in a deformed state, after the first rolling element 301 and the second rolling element 302 roll slightly in a synchronous forward direction, there is a certain gap between the first rolling element 301 and the first groove extension 1002. The second elastic reset element 303 is still tightly attached to the second groove extension 1003 and undergoes a certain degree of deformation under the pressure of the second rolling element 302.

[0086] Subsequently, when the load decreases or even disappears, the second elastic reset member 303 pushes the second rolling member 302 in the opposite direction under the elastic action of the second elastic reset member 303, causing the first rolling member 301 and the second rolling member 302 to roll slightly in the opposite direction synchronously until the first rolling member 301, the second rolling member 302 and the corrugated foil 22 are reset.

[0087] As can be seen, the present invention provides a mounting groove 100 for the housing 10, which is composed of a groove body 1001, a first groove extension 1002, and a second groove extension 1003. The first groove extension 1002 and the second groove extension 1003 define the mounting positions of the first rolling member 301 and the second elastic reset member 303. Simultaneously, the groove body 1001 provides rolling space for the two rolling members.

[0088] This structure simplifies the number of parts in the movable support assembly 30, allowing the reset action to be achieved solely through the second elastic reset member 303 in conjunction with the two rolling members. When the corrugated foil 22 is under load, causing the first rolling member 301 and the second rolling member 302 to roll, the second rolling member 302 compresses the second elastic reset member 303, causing it to deform. After unloading, the second elastic reset member 303 pushes the second rolling member 302 back, thereby synchronously resetting the first rolling member 301, thus completing the shape restoration of the corrugated foil 22. The operation is smooth and reliable.

[0089] In another alternative embodiment, the movable support assembly 30 comprises a first rolling element 301, a second rolling element 302, a first elastic reset element, and a second elastic reset element 303. Meanwhile, as... Figures 9 to 10 As shown, the housing 10 is provided with a first mounting groove 101 and a second mounting groove 102 that are alternately distributed circumferentially along the shaft hole 103. The first mounting groove 101 has a first groove body 1011 and a third groove extension 1013 that are connected. The second mounting groove 102 has a second groove body 1021 and a fourth groove extension 1024 that are connected. The first rolling member 301 is movably disposed in the first groove body 1011. The first elastic reset member is fixedly disposed in the third groove extension 1013. The second rolling member 302 is movably disposed in the second groove body 1021. The second elastic reset member 303 is fixedly disposed in the fourth groove extension 1024.

[0090] It should be noted that the shape of the first groove body 1011 is adapted to the shape of the first rolling element 301, and the shape of the third groove extension 1013 is adapted to the shape of the first elastic reset element. Preferably, the first rolling element 301 is cylindrical and the first elastic reset element is quadrangular prism. In this case, the first groove body 1011 has an arc-shaped groove wall, and the third groove extension 1013 has a polygonal groove wall.

[0091] Similarly, the shape of the second groove body 1021 is adapted to the shape of the second rolling element 302, and the shape of the fourth groove extension 1024 is adapted to the shape of the second elastic reset element 303. Preferably, the second rolling element 302 is cylindrical, and the second elastic reset element 303 is quadrangular prism. In this case, the second groove body 1021 has an arc-shaped groove wall, and the fourth groove extension 1024 has a polygonal groove wall.

[0092] When the corrugated foil 22 is in its initial state, the first rolling element 301 is located in the first mounting groove 101 and is tightly fitted with the first groove body 1011; the first elastic reset element is located in the first mounting groove 101 and is tightly fitted with the third groove extension 1013. At the same time, the first rolling element 301 is in contact with the first elastic reset element, and the first elastic reset element does not deform at this time.

[0093] The second rolling element 302 is located within the second mounting groove 102 and is tightly fitted with the second groove body 1021; the second elastic reset element 303 is located within the second mounting groove 102 and is tightly fitted with the fourth groove extension 1024. Simultaneously, the second rolling element 302 and the second elastic reset element 303 are in contact, and the second elastic reset element 303 does not deform at this time.

[0094] When the corrugated foil 22 is in a deformed state, after the first rolling element 301 and the second rolling element 302 undergo slight synchronous forward rolling, there is a certain gap between the first rolling element 301 and the first groove body 1011. The first elastic reset element remains tightly fitted with the third groove extension 1013 and undergoes a certain degree of deformation under the pressure of the first rolling element 301. At the same time, there is a certain gap between the second rolling element 302 and the second groove body 1021, and the second elastic reset element 303 remains tightly fitted with the fourth groove extension 1024 and undergoes a certain degree of deformation under the pressure of the second rolling element 302.

[0095] Subsequently, when the load decreases or even disappears, the first rolling element 301 is pushed in the opposite direction under the elastic action of the first elastic reset element, and the second rolling element 302 is pushed in the opposite direction under the elastic action of the second elastic reset element 303, so that the first rolling element 301 and the second rolling element 302 roll slightly in the opposite direction until the first rolling element 301, the second rolling element 302 and the corrugated foil 22 are reset.

[0096] As can be seen, the present invention provides the housing 10 with mutually independent first mounting groove 101 and second mounting groove 102. The first mounting groove 101 is composed of a first groove body 1011 and a third groove extension 1013, and the second mounting groove 102 is composed of a second groove body 1021 and a fourth groove extension 1024. The first groove body 1011 and the third groove extension 1013 define the mounting positions of the first rolling element 301 and the first elastic reset element, while the second groove body 1021 and the fourth groove extension 1024 define the mounting positions of the second rolling element 302 and the second elastic reset element 303, thereby making the synchronous rolling of the first rolling element 301 and the second rolling element 302 more precise.

[0097] Simultaneously, the two elastic reset components provide elastic reset force, resulting in a stronger reset driving force. Even if one elastic reset component experiences performance degradation, the other elastic reset component can still provide sufficient reset thrust, further improving operational reliability and making it more suitable for applications with large load fluctuations.

[0098] In some embodiments, both the first elastic reset member and the second elastic reset member 303 are elastic rubber parts. Compared to springs, elastic rubber parts have lower production costs, are easier to process and mold, and can directly conform to the surfaces of the mounting groove 100 and the rolling element. They do not produce abnormal noises from metal-on-metal collisions during cushioning, and can also avoid the problem of spring corrosion and jamming after long-term use, thus meeting the clean and low-vibration working requirements of gas bearings.

[0099] In some embodiments, such as Figure 4 and Figure 5 As shown, a first included angle θ1 is formed between the line connecting the center distances of the first rolling element 301 and the second rolling element 302 and the first slot 3011, and a second included angle θ2 is formed between the line connecting the center distances of the first rolling element 301 and the second rolling element 302 and the first slot 3011. Both the first included angle θ1 and the second included angle θ2 are within the range of 30 degrees to 90 degrees.

[0100] It should be noted that the corrugated foil 22 has a symmetrical structure, with the first included angle θ1 and the second included angle θ2 being equal. The first included angle θ1 and the second included angle θ2 are key parameters that directly affect the deformation and stiffness of the corrugated foil 22, and consequently, the stability of the bearing structure. The smaller the included angle, the more difficult it is for the corrugated foil 22 to deform, resulting in greater bearing stiffness, suitable for heavy loads; conversely, the larger the included angle, the easier it is for the corrugated foil 22 to deform, resulting in lower bearing stiffness, suitable for light loads.

[0101] This invention sets the first included angle θ1 and the second included angle θ2 within the range of 30 to 90 degrees. This not only adapts to the load requirements for bearing stiffness under most conventional working conditions, but also avoids the problem of insufficient buffering and shock absorption caused by excessively small included angles. At the same time, it also prevents the bearing stiffness from being too low due to excessively large included angles, which would not provide sufficient support force and affect the structural stability of the bearing. While ensuring the working stability of the bearing, it also broadens the applicable scenarios of the bearing.

[0102] In some embodiments, such as Figure 4 and Figure 5 As shown, the center distance L between the first rolling element 301 and the second rolling element 302 is in the range of 5mm to 20mm.

[0103] It should be noted that the center distance between the two rolling elements is a key parameter that directly affects the deformation and stiffness of the corrugated foil 22, and thus the stability of the bearing structure. The smaller the center distance, the more difficult it is for the corrugated foil 22 to deform, and the greater the bearing stiffness, making it suitable for heavy loads; conversely, the larger the center distance, the easier it is for the corrugated foil 22 to deform, and the smaller the bearing stiffness, making it suitable for light loads.

[0104] This invention, by setting the center distance L within the range of 5mm to 20mm, can cover the bearing stiffness requirements of different loads in most conventional working scenarios. It can avoid the problem of excessive bearing stiffness due to an excessively small center distance, which reduces the buffering and shock absorption capacity and easily causes vibration and impact during operation. It can also prevent the bearing stiffness from being too low due to an excessively large center distance, which can lead to structural instability due to the inability to withstand the working load. Under the premise of ensuring stable operation of the bearing, it can adapt to a variety of application requirements from conventional small loads to medium to large loads, thus improving the adaptability and practicality of the hydrodynamic gas radial bearing.

[0105] In some embodiments, such as Figure 2 , Figure 6 and Figure 11 As shown, the housing 10 has a connected flat foil slot 104 and a fixing slot 105. The two ends of the top foil 21 are a free end 212 and a fixed end 211, respectively. The fixed end 211 is inserted into the flat foil slot 104, and the fixing slot 105 has a fixing pin 40 that abuts against the fixed end 211.

[0106] In practical applications, the flat foil slot 104 and the fixing slot 105 can be partially overlapped. In this way, the fixing pin 40 can more firmly fix the top foil 21 after installation. At the same time, the two ends of the top foil 21 are the free end 212 and the fixed end 211, which makes the top foil 21 extendable along the circumference of the shaft hole 103, thereby adapting to certain load changes.

[0107] As can be seen, in this invention, the fixed end 211 of the top foil 21 is inserted into the flat foil slot 104 of the housing 10, and a fixing pin 40 is inserted into the fixing groove 105 of the housing 10 to fix the top foil 21 and prevent the top foil 21 from moving during operation. In addition, the free end 212 of the top foil 21 can be extended to a certain extent, thereby improving the load-bearing capacity of the top foil 21.

[0108] In some embodiments, the compressor provided by the present invention includes a rotating shaft and a dynamic pressure gas radial bearing, wherein the dynamic pressure gas radial bearing is sleeved on the rotating shaft.

[0109] In practical use, the hydrodynamic gas radial bearing is fitted onto the rotor shaft, with a clearance fit between the shaft and the bearing. The clearance between them is used to form a gas film. During operation, the shaft rotates at high speed under the influence of an electromagnetic field. When the speed reaches a preset value, the hydrodynamic gas radial bearing forms a gas film through the hydrodynamic effect, suspending the shaft in the air.

[0110] Because this invention employs a separate corrugated foil component for the dynamic pressure gas radial bearing, each corrugated foil 22 is independently configured. This ensures that when a single corrugated foil 22 deforms under stress, it does not affect the structural state of other corrugated foils 22, effectively avoiding the chain deformation problem that easily occurs with integral corrugated foils 22. Simultaneously, this invention also equips each corrugated foil 22 with a corresponding movable support assembly 30. This movable support assembly 30 is configured to cause the corrugated foil 22 to roll relative to the top foil 21 when the top foil 21 is subjected to pressure and causes deformation. Through the action of the movable support assembly 30, the contact position between the corrugated foil 22 and the top foil 21 changes, and the support height and curvature of the corrugated foil 22 on the top foil 21 are adjusted accordingly. This allows the corrugated foil 22 to obtain a shape adapted to the current load condition, meeting the deformation requirements under different loads, reducing the stress during corrugated foil 22 deformation, and improving the operational reliability of the bearing structure. Therefore, the operating stability and service life of the compressor of this invention are also simultaneously improved.

[0111] For ease of understanding, the preferred hydrodynamic gas radial bearing of the present invention will be described in detail below.

[0112] Please see Figures 1 to 8 The hydrodynamic gas radial bearing includes a housing 10, a foil assembly 20, several movable support assemblies 30, and a fixed pin 40.

[0113] The housing 10 has a shaft hole 103, several mounting slots 100, a flat foil slot 104, and a fixing slot 105. The shaft hole 103 allows the rotor shaft to pass through. The several mounting slots 100 are distributed circumferentially along the shaft hole 103 for mounting the movable support assembly 30. The mounting slot 100 consists of a groove body 1001, a first groove extension 1002, and a second groove extension 1003. The flat foil slot 104 is used to mount the fixing end 211 of the top foil 21, and the fixing slot 105 is used to mount the fixing pin 40.

[0114] The foil assembly 20 consists of a top foil 21 and a separable corrugated foil component. The top foil 21 has a free end 212 and a fixed end 211 at its two ends. The separable corrugated foil component is located between the top foil 21 and the housing 10, and has corrugated foils 22 spaced circumferentially along the axial hole 103. A protruding body 220 is formed between the two ends of the corrugated foils 22, which abuts against the top foil 21.

[0115] The movable support assembly 30 consists of a first rolling element 301, a second rolling element 302, and a second elastic reset element 303. The first rolling element 301 is provided with a first slot 3011, and the second rolling element 302 is provided with a second slot 3021.

[0116] After the hydrodynamic gas radial bearing is assembled, several movable support components 30 correspond one-to-one with several mounting slots 100. The first rolling element 301 contacts the first groove extension 1002, and the second elastic reset element 303 contacts the second groove extension 1003. There is a certain distance between the second rolling element 302 and the first rolling element 301. The second rolling element 302 contacts the second elastic reset element 303, but does not cause deformation of the second elastic reset element 303. The fixed end 211 of the top foil 21 is inserted into the flat foil slot 104, and the fixing pin 40 is inserted into the fixing slot 105 to fix the top foil 21. The two ends of the corrugated foil 22 are respectively inserted into the first slot 3011 and the second slot 3021, and its protruding body 220 abuts against the arc-shaped body 210 of the top foil 21.

[0117] During operation, the top foil 21 is pressed against the corrugated foil 22, causing it to deform. The deformation of a single corrugated foil 22 is not affected by the deformation of other corrugated foils 22. By the synchronous rolling of the first rolling element 301 and the second rolling element 302, the shape of the corrugated foil 22 can be changed, thereby meeting the different shape requirements of the corrugated foil 22 under different loads and improving the stability and reliability of the bearing structure under different loads and operating conditions.

[0118] like Figure 12As shown, the corrugated foil 22 exhibits significant deformation, especially under heavy loads. The synchronous rolling of the first rolling element 301 and the second rolling element 302 causes the corrugated foil 22 to roll relative to the flat foil, adapting to the deformation of the corrugated foil 22, reducing stress on the corrugated foil 22 under large deformation conditions, and improving the reliability of the bearing structure. Furthermore, the second rolling element 302 compresses the second elastic reset element 303 during rolling, causing the second elastic reset element 303 to deform to a certain extent. When the load decreases or even disappears, the second elastic reset element 303 can push the second rolling element 302 in the opposite direction, and the first rolling element 301 rolls synchronously, allowing the corrugated foil 22 to smoothly recover its deformation.

[0119] Therefore, in the hydrodynamic gas radial bearing of the present invention, each corrugated foil 22 is individually installed in two rolling elements. The different corrugated foils 22 are independent of each other and do not affect each other during operation, which can effectively improve the reliability of the bearing structure. The two rolling elements can rotate and move (i.e., roll) appropriately during operation, which can change the support shape of the corrugated foil 22, thereby improving the reliability and stability of the bearing structure under different loads and operating conditions.

[0120] It should be noted that the terminology used above is for describing specific embodiments only and is not intended to limit the exemplary embodiments of the present invention. When the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. The order of execution of actions, steps, etc., in the apparatus and methods shown in the specification and drawings may be implemented in any order unless a specific express order is specified, and as long as the output of a previous process is not used in a subsequent process. Similar sequential terms used for ease of description do not imply that such an order must be followed.

[0121] Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as constraints. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0122] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydrodynamic gas radial bearing, comprising a housing having a shaft bore and a foil assembly disposed within the shaft bore, the foil assembly comprising a top foil and a separable corrugated foil component, the separable corrugated foil component being located between the top foil and the housing, and having corrugated foils spaced circumferentially along the shaft bore, characterized in that, It also includes a movable support assembly disposed between the housing and the corrugated foil, the movable support assembly being configured to cause the corrugated foil to roll relative to the top foil when the top foil is subjected to force to compress the corrugated foil and cause it to deform.

2. The hydrodynamic gas radial bearing according to claim 1, characterized in that, The movable support assembly includes a first rolling element with a first slot and a second rolling element with a second slot. The two ends of the corrugated foil are respectively inserted into the first slot and the second slot, and a protruding body is formed between the two ends to abut against the top foil.

3. The hydrodynamic gas radial bearing according to claim 2, characterized in that, The movable support assembly further includes a first elastic reset member and / or a second elastic reset member. The first elastic reset member is connected to the first rolling member, and the deformation direction of the first elastic reset member is the same as the movement direction of the central axis of the first rolling member when it rolls. The second elastic reset member is connected to the second rolling member, and the deformation direction of the second elastic reset member is the same as the movement direction of the central axis of the second rolling member when it rolls.

4. The hydrodynamic gas radial bearing according to claim 3, characterized in that, The housing is provided with mounting grooves distributed circumferentially along the shaft hole. The mounting groove has a groove body and a first groove extension and a second groove extension located on both sides of the groove body. The first rolling element is movably disposed in the first groove extension, the second rolling element is movably disposed in the groove body, and the second elastic reset element is fixedly disposed in the second groove extension.

5. The hydrodynamic gas radial bearing according to claim 3, characterized in that, The housing is provided with a first mounting groove and a second mounting groove that are alternately distributed circumferentially along the shaft hole. The first mounting groove has a first groove body and a third groove extension that are connected. The second mounting groove has a second groove body and a fourth groove extension that are connected. The first rolling element is movably disposed in the first groove body. The first elastic reset element is fixedly disposed in the third groove extension. The second rolling element is movably disposed in the second groove body. The second elastic reset element is fixedly disposed in the fourth groove extension.

6. The hydrodynamic gas radial bearing according to claim 3, characterized in that, Both the first elastic reset component and the second elastic reset component are elastic rubber components.

7. The hydrodynamic gas radial bearing according to claim 2, characterized in that, A first angle θ1 is formed between the line connecting the center distances of the first rolling element and the second rolling element and the first slot, and a second angle θ2 is formed between the line connecting the center distances of the first rolling element and the second rolling element and the first slot. Both the first angle θ1 and the second angle θ2 are within the range of 30 degrees to 90 degrees.

8. The hydrodynamic gas radial bearing according to claim 2, characterized in that, The center distance L between the first rolling element and the second rolling element is in the range of 5mm to 20mm.

9. The hydrodynamic gas radial bearing according to any one of claims 1 to 8, characterized in that, The housing has a connected flat foil slot and a fixing slot. The top foil has a free end and a fixed end at its two ends, respectively. The fixed end is inserted into the flat foil slot, and the fixing slot has a fixing pin that abuts against the fixed end.

10. A compressor, characterized in that, It includes a rotor with a rotating shaft and a hydrodynamic gas radial bearing as described in any one of claims 1 to 9, the hydrodynamic gas radial bearing being sleeved on the rotating shaft.

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