Liquid metal bearing with a sealing structure

Abstract

The present application relates to the technical field of liquid bearing, and particularly relates to a liquid metal bearing with a sealing structure, which comprises a shaft sleeve, a rotating shaft, liquid metal and a flange, the rotating shaft is rotatably assembled in the shaft sleeve, the rotating shaft and the shaft sleeve are filled with the liquid metal, and the flange is fixedly installed on the shaft sleeve and axially limits the rotating shaft. The flange and the shaft sleeve form a first sealing surface, the flange and the rotating shaft form a second sealing surface, the first sealing surface is sequentially arranged with an anti-wetting layer and a metal layer along a liquid metal leakage channel, the anti-wetting layer can effectively inhibit capillary penetration of the liquid metal along the end surface micro channel, the metal layer can react with the leaked liquid metal and realize plugging and blocking, and the second sealing surface is provided with a liquid locking structure and can hinder the liquid metal from leaking outward. The present application constructs a multi-stage composite sealing system on the bearing sealing interface, effectively blocks the multi-stage leakage path of the liquid metal, and is suitable for high-end precision equipment.

Description

Technical Field

[0001] This invention relates to the field of liquid bearing technology, and more particularly to a liquid metal bearing with a sealing structure. Background Technology

[0002] Liquid metal bearings are a new type of sliding bearing that uses liquid metal (such as gallium indium tin alloy) as a lubricating medium. Unlike traditional oil-lubricated bearings, they rely on the low vapor pressure, high surface tension, and excellent electrical and thermal conductivity of liquid metal to form an extremely thin liquid film between relatively moving friction pairs, achieving operation without solid contact.

[0003] Existing liquid metal bearings mainly consist of a shaft, bushing, and sealing flange. The internal seal stores liquid metal, which fills the friction gap through capillary action, ensuring low friction and high heat dissipation during operation. To adapt to high-speed operating conditions and improve structural stability, the sealing surfaces of existing bearings are made of high-hardness molybdenum, utilizing molybdenum's high-temperature resistance and good chemical stability to meet the requirements of high-speed operation.

[0004] However, the existing structure has significant defects, the core issue being insufficient sealing reliability. Current bearings rely on the precise bonding of molybdenum hard end faces to achieve sealing, which requires extremely high machining accuracy, end face flatness, and assembly fit, resulting in high manufacturing costs. Furthermore, the rigid bonding of two sets of hard end faces cannot achieve a complete seal, and micropores and micro-permeability channels inevitably exist at the contact surface.

[0005] Under prolonged high-speed rotation and alternating hot and cold operating conditions, microscopic channels gradually expand, leading to slow leakage of liquid metal. Once the medium leaks, the bearing cannot maintain a complete lubricating film, resulting in dry friction, a surge in resistance, and excessive temperature rise, exacerbating wear on the friction pair. Simultaneously, it causes the bearing's electrical and thermal conductivity to fail, easily triggering equipment sparking, operational stalls, and ultimately, bearing failure. Currently, most liquid metal bearing equipment failures in the industry are caused by medium leakage, representing a core technological bottleneck limiting the long-term stable operation of the product.

[0006] In summary, existing liquid metal bearings suffer from problems such as poor sealing reliability, high machining precision requirements, easy leakage during long-term operation, and high failure risk. There is an urgent need to optimize the structure and develop a liquid metal bearing that is suitable for harsh high-speed operating conditions and has excellent sealing performance to solve the defects of existing technologies. Summary of the Invention

[0007] The purpose of this invention is to provide a liquid metal bearing with a sealing structure, which seals the liquid metal inside the bearing and prevents liquid metal leakage.

[0008] To achieve this objective, the present invention adopts the following technical solution: A liquid metal bearing with a sealed structure includes: bushing; A rotating shaft, the end of which is rotatably disposed within the bushing; Liquid metal, which fills the space between the rotating shaft and the bushing; A flange is fixedly connected to the bushing and limits the axial movement of the rotating shaft. The flange and the bushing form a first sealing surface, and the flange and the rotating shaft form a second sealing surface. The first sealing surface is provided with an anti-wetting layer to inhibit the capillary permeation of the liquid metal along the end face microchannel and a metal layer for reacting with the liquid metal. The anti-wetting layer and the metal layer are arranged sequentially along the liquid metal leakage channel. The second sealing surface is provided with a liquid-locking structure to prevent the leakage of the liquid metal.

[0009] Furthermore, a bent structure is formed on the first sealing surface, and the flange and the bushing are fitted together at the bent structure.

[0010] Furthermore, the bending structure includes a sealing groove provided on the bushing and a sealing protrusion provided on the flange; or, The bending structure includes a sealing protrusion on the bushing and a sealing groove on the flange, and the metal layer is disposed in the sealing protrusion and the sealing groove.

[0011] Furthermore, the width-to-depth ratio of the sealing groove is 5:1-10:1, and the depth is 0.1mm-1mm.

[0012] Furthermore, the cross-section of the sealing groove and the sealing protrusion is rectangular.

[0013] Furthermore, the metal layer is a soft metal, and the metal layer is copper, silver, or an alloy containing both.

[0014] Furthermore, the thickness of the metal layer is 5μm-50μm.

[0015] Furthermore, the anti-wetting layer is planar, and the anti-wetting layer is an oxide ceramic, a carbide ceramic, or a nitride ceramic.

[0016] Furthermore, the liquid-locking structure includes liquid-locking protrusions and liquid-locking grooves, and both the rotating shaft and the flange are provided with liquid-locking protrusions and liquid-locking grooves; the liquid-locking protrusions on the rotating shaft and the flange are arranged alternately and are embedded in the liquid-locking grooves of both.

[0017] Furthermore, a liquid storage cavity is provided between one of the liquid-locking protrusions and the liquid-locking groove for storing the leaked liquid metal.

[0018] Furthermore, a rotor copper sleeve is also fitted on the outer side of the bushing and the flange, and a plurality of liquid collecting ring grooves are provided on the inner wall of the rotor copper sleeve, and the plurality of liquid collecting ring grooves are arranged along the axial direction of the rotating shaft.

[0019] Furthermore, the width of the opening of the liquid collecting ring groove is smaller than the width of the bottom of the groove.

[0020] Furthermore, the end of the rotor copper sleeve is bent inward and forms a liquid-retaining ring.

[0021] The beneficial effects of this invention are: The liquid metal bearing with a sealing structure disclosed in this invention includes a bushing, a rotating shaft, liquid metal, and a flange. The end of the rotating shaft is rotatably mounted inside the bushing. Liquid metal for lubrication and heat conduction is filled between the rotating shaft and the bushing. The flange is fixedly installed on the bushing and provides axial restraint for the rotating shaft. The flange and bushing cooperate to form a first sealing surface, and the flange and rotating shaft cooperate to form a second sealing surface. An anti-wetting layer and a metal layer are sequentially arranged along the liquid metal leakage channel on the first sealing surface. The anti-wetting layer effectively inhibits capillary permeation of the liquid metal along the end face microchannels, and the metal layer reacts with the leaking liquid metal to achieve sealing and blocking. The second sealing surface is equipped with a liquid-locking structure to prevent liquid metal from leaking outwards. This invention solves the problems of microscopic gaps at the end face of traditional hard-bonded liquid metal bearings, easy capillary leakage of liquid metal, poor bearing operation stability, and easy sparking failure by constructing a multi-level composite sealing system at the bearing sealing interface. It effectively blocks multi-level leakage paths of liquid metal, significantly improves the sealing reliability and service life of liquid metal bearings under high-speed, high-temperature, and high-power conditions, has a compact structure, excellent sealing effect, and is suitable for the long-term stable operation requirements of high-end precision rotating equipment. Attached Figure Description

[0022] Figure 1 This is an overall schematic diagram of a liquid metal bearing with a sealing structure in an embodiment of the present invention; Figure 2 This is a schematic diagram of removing the rotor copper sleeve from a liquid metal bearing with a sealing structure in an embodiment of the present invention; Figure 3 This is a cross-sectional view of a liquid metal bearing with a sealing structure according to an embodiment of the present invention; Figure 4 This is a cross-sectional view of the liquid metal bearing with a sealing structure in an embodiment of the present invention, showing the removal of the rotor copper sleeve; Figure 5 yes Figure 3 Enlarged view of point A in the middle; Figure 6 yes Figure 3 Enlarged view of point B in the middle.

[0023] In the diagram: 1. Bushing; 2. Shaft; 3. Liquid metal; 4. Flange; 5. First sealing surface; 51. Anti-wetting layer; 52. Metal layer; 53. Bending structure; 531. Sealing groove; 532. Sealing protrusion; 6. Second sealing surface; 61. Liquid-locking structure; 611. Liquid-locking protrusion; 612. Liquid-locking groove; 613. Liquid storage chamber; 7. Rotor copper sleeve; 71. Liquid collecting ring groove; 72. Liquid retaining ring. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0025] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0028] Reference Figures 1 to 6This embodiment specifically discloses a liquid metal bearing with a sealed structure, suitable for high-speed, high-temperature, and high-power-density precision rotating equipment, especially suitable for applications such as medical X-ray tubes where stringent requirements for bearing sealing, operational stability, and service life are placed. The liquid metal bearing of this embodiment primarily addresses the industry pain point of microscopic gaps and capillary leakage channels that exist after the machining and assembly of the molybdenum hard end face, leading to liquid metal leakage, bearing lubrication failure, equipment arcing, and overall machine malfunction.

[0029] The liquid metal 3 bearing in this embodiment includes a bushing 1, a rotating shaft 2, liquid metal 3, a flange 4, and a rotor copper sleeve 7. The overall structure has a clear hierarchy and a progressive sealing logic. Through a multi-coupling mechanism of mechanical structure sealing, material back-wetting and seepage prevention, chemical reaction sealing, labyrinth liquid locking and interception, and end liquid collection interception, the multi-level leakage paths of liquid metal 3 are blocked, which greatly improves the sealing reliability and working condition adaptability of the bearing during long-term high-speed operation.

[0030] In the overall assembly structure, the end of the rotating shaft 2 is rotatably mounted in the internal cavity of the bushing 1. A uniform bearing working clearance is reserved between the rotating shaft 2 and the bushing 1, and the interior of this clearance is completely filled with liquid metal 3 as a lubricating and heat-conducting medium. Compared with traditional lubricating oil, liquid metal 3 has extremely low saturated vapor pressure, ultra-high surface tension, and excellent electrical and thermal conductivity. During high-speed operation of the equipment, liquid metal 3 can form a continuous and stable hydrodynamic film between the friction pair of the rotating shaft 2 and the bushing 1, realizing the operation of the friction pair without solid contact, reducing friction and wear, and at the same time quickly dissipating the large amount of frictional heat generated by the high-speed operation of the friction pair, avoiding component deformation and performance degradation caused by high-temperature heat accumulation, and adapting to the harsh working environment of high speed, high temperature, and high load.

[0031] Reference Figure 3 and Figure 4 Flange 4 is fixedly mounted on the outer end face of bushing 1 and securely locked with fasteners. After assembly, flange 4 provides reliable axial positioning for shaft 2, limiting axial movement and ensuring overall bearing operating accuracy. The end faces of flange 4 and bushing 1 that are in contact with each other form a first sealing surface 5, which is mainly used to seal the liquid metal 3 in the core lubrication area inside the bearing, preventing the liquid metal 3 from leaking outward from the bearing end face gap. The annular area where flange 4 and shaft 2 are in clearance fit forms a second sealing surface 6, which is used to seal the leakage path of liquid metal 3 in the axially extended gap. Together with the first sealing surface 5, they form a double-layer sealing system, constructing the basic sealing and protection structure of the bearing.

[0032] The first sealing surface 5 serves as the first core barrier to prevent leakage of liquid metal 3. Along the direction of outward leakage of liquid metal 3, an anti-wetting layer 51 and a metal layer 52 are sequentially arranged. The two layers are arranged in an orderly manner and complement each other in function, forming a composite sealing mechanism of "pre-seepage prevention and post-sealage". Among them, the anti-wetting layer 51 is a flat planar structure and is made of any one of oxide ceramics, carbide ceramics or nitride ceramics. This type of ceramic material has extremely high chemical stability and interfacial inertness, and exhibits extremely strong anti-wetting characteristics with gallium indium tin liquid metal 3. Liquid metal 3 cannot spread or wet on the surface of ceramic coating, which can inhibit the capillary penetration phenomenon of liquid metal 3 based on the micro gaps of the end face from the source, block the driving force of initial leakage of liquid metal 3, and significantly reduce the flow of liquid metal 3 penetrating the first sealing surface 5.

[0033] The metal layer 52 is tightly fitted downstream of the leakage channel on the outside of the anti-wetting layer 51. It is made of a soft metal material, such as copper, silver, or a composite alloy of the two. The overall thickness of the metal layer 52 is strictly controlled between 5μm and 50μm, with good thickness uniformity, and can completely cover the sealing mating area of ​​the first sealing surface 5. Compared with hard ceramics, the soft metal material has good plastic deformation ability. Under the pressure of mutual mating, it can be tightly fitted together, reducing the generation of capillary channels. At the same time, it can undergo a stable chemical reaction with the trace amount of liquid metal 3 that penetrates the anti-wetting layer 51, forming a dense intermetallic compound solid sealing layer in situ. This layer can fill the microscopic leakage pores, lock the tiny leakage channels, and achieve secondary interception and sealing of the trace amount of escaping liquid metal 3, preventing the continuous penetration and diffusion of liquid metal 3 and ensuring the long-term sealing performance of the first sealing surface 5.

[0034] To further improve the fitting accuracy and sealing performance of the first sealing surface 5, and to achieve automatic centering and positioning during assembly, a bending structure 53 is provided at the position of the first sealing surface 5. The bushing 1 and the flange 4 are assembled by nesting and fitting each other through the bending structure 53, replacing the traditional pure flat fitting sealing form.

[0035] Combination Figure 5The bending structure 53 includes a sealing groove 531 and a sealing protrusion 532. Both the sealing groove 531 and the sealing protrusion 532 are annular structures. The sealing groove 531 and the sealing protrusion 532 can be flexibly adapted to two assembly forms. The first form is that the sealing groove 531 is opened on the end face of the bushing 1 and the sealing protrusion 532 is correspondingly set on the end face of the flange 4. The second form is that the sealing protrusion 532 is set on the end face of the bushing 1 and the sealing groove 531 is opened on the end face of the flange 4. Both mating structures can achieve precise fitting and positioning. Moreover, all mating surfaces of the sealing protrusion 532 and the sealing groove 531 are fully covered with a metal layer 52 to ensure that the entire mating contact surface has the ability to react and seal. In terms of structural dimensions, the sealing groove 531 has a regular rectangular cross-section with a width-to-depth ratio strictly controlled between 5:1 and 10:1. The overall depth of the groove is limited to between 0.1mm and 1mm. Under these dimensional parameters, the concave-convex mating structure has high structural strength, good fitting accuracy, and uniform stress distribution. It will not cause positioning failure due to the groove being too shallow, nor will it cause structural strength deficiency or deformation failure due to the groove being too deep.

[0036] Furthermore, the cross-sections of the sealing groove 531 and the sealing protrusion 532 can be close to rectangular. The lifting angle of the sealing groove 531 is greater than or equal to 70° and the roughness Ra is less than 0.2 micrometers. The lifting angle of the sealing protrusion is greater than or equal to 70° and the roughness Ra is less than 0.2 micrometers. That is, the difference in lifting angle between the sealing protrusion and the sealing groove 531 does not exceed 5°.

[0037] During the assembly of bushing 1 and flange 4, the precise fitting and matching of sealing protrusion 532 and sealing groove 531 automatically completes the coaxial alignment and correction of bushing 1 and flange 4. This eliminates the need for additional special alignment fixtures and separate alignment assembly steps, effectively simplifying the assembly process, reducing assembly errors, and improving the overall assembly accuracy. Simultaneously, the concave-convex fitting structure of the rectangular cross-section transforms the originally straight leakage path into a multi-stage right-angle bend path, significantly extending the effective path length for liquid metal 3 to leak outwards. Multiple right-angle bends greatly increase the resistance of liquid metal 3 to the sealing surface, significantly increasing the difficulty of leakage. The bushing 1 and flange 4 are fastened together with screws. During the fastening process, a uniform axial compressive stress is generated, which can cause the soft metal layer 52 on the surface of the concave and convex structure to undergo uniform and slight plastic deformation. This compensates for the microscopic flatness error caused by machining, and enables the concave and convex mating contact surfaces to achieve a complete and tight fit. This completely eliminates the microscopic gaps and capillary channels that cannot be avoided by traditional hard molybdenum end face bonding, forming a continuous, dense, and non-porous liquid metal 3 capture sealing layer, thus preventing the initial leakage risk from a structural level.

[0038] Reference Figure 6The second sealing surface 6 serves as another protective barrier for the inner sealing layer of the bearing, and it is also equipped with an anti-wetting layer 51. The two anti-wetting layers 51 have the same structure, which will not be described in detail here. The liquid-locking structure 61 is formed on the anti-wetting layer 51 of the second sealing surface 6. The liquid-locking structure 61 includes interlocking liquid-locking protrusions 611 and liquid-locking grooves 612. The outer wall of the rotating shaft 2 and the inner annular surface of the flange 4 are respectively provided with liquid-locking protrusions 611 and liquid-locking grooves 612. The liquid-locking protrusions 611 on the rotating shaft 2 and the flange 4 are arranged in an alternating pattern. After assembly, the liquid-locking protrusions 611 on both sides can be embedded into the liquid-locking grooves 612 on each other, forming a multi-layered, deeply interlocking labyrinthine liquid-locking channel. This labyrinthine structure changes the straight leakage path of the liquid metal 3, making the leakage path tortuous and complex with multiple reversals, which greatly increases the resistance to axial and radial diffusion leakage of the liquid metal 3, effectively delaying and blocking the outward diffusion of the liquid metal 3.

[0039] Between the mating gaps of adjacent liquid-locking protrusions 611 and liquid-locking grooves 612, a closed liquid storage cavity 613 is formed. The liquid storage cavity 613 is specifically used to temporarily collect and store trace amounts of liquid metal 3 that have escaped through the first sealing surface 5, preventing the trace amounts of liquid metal 3 from continuously seeping outward along the gap, thus achieving on-site interception of the leaked medium. At the same time, the anti-wetting layer 51 arranged on the second sealing surface 6 continues the ceramic anti-wetting barrier mechanism, which can further weaken the wetting and penetration ability of liquid metal 3, improve the overall liquid-blocking effect of the labyrinth liquid-locking structure 61, and doubly enhance the sealing and barrier performance of the second sealing surface 6, minimizing the outward leakage of the inner liquid metal 3.

[0040] On the outside of the bearing body sealing structure, the bushing 1 and the flange 4 are integrally fitted to fix the rotor copper sleeve 7, which serves as the outermost ultimate sealing protection structure of the bearing. This structure is used to capture and retain all residual liquid metal 3 that penetrates the inner sealing structure, preventing the liquid metal 3 from spreading into the equipment vacuum cavity and causing malfunctions.

[0041] The rotor copper sleeve 7 is a hollow sleeve with openings at both ends. One end is bent and abuts against the outer wall of the shaft sleeve 1, and the two can be connected by bolts or welding. The other end is also bent inward to form an annular liquid-blocking ring 72. There is a gap between the inner wall of the rotor copper sleeve 7 and the outer peripheral wall of the shaft sleeve 1. The inner wall of the rotor copper sleeve 7 is evenly distributed with multiple liquid-collecting annular grooves 71 along the axial direction of the rotating shaft 2. The multiple liquid-collecting annular grooves 71 are evenly distributed and can completely cover the axial flow path of the liquid metal 3, achieving full interception.

[0042] All liquid collecting ring grooves 71 adopt an asymmetrical irregular cross-sectional structure, specifically a trapezoidal or trumpet-shaped structure with a groove opening width smaller than the groove bottom width, forming a unidirectional liquid-locking structure 61 that is narrow at the top and wide at the bottom. This structure has excellent unidirectional liquid storage characteristics. After the liquid metal 3 flows into the tank under the action of capillary force and centrifugal force, it is difficult for it to flow back or escape from the tank on its own. It can be stably stored inside the liquid collecting ring groove 71 for a long time, achieving long-term lock-in. When a very small amount of liquid metal 3 penetrates the inner first and second sealing structures, leaks outward along the bearing gap and flows axially along the inner wall of the rotor copper sleeve 7, the liquid metal 3 in the flow process will flow into the liquid collecting ring grooves 71 in sequence, and be stably intercepted by layer and zone, preventing the liquid metal 3 from continuously diffusing to the end.

[0043] The liquid-blocking ring 72 can perform the final physical interception of residual liquid metal 3 flowing axially to the end, sealing the last leakage path. This structure can cover the leakage area of ​​liquid metal 3 to the maximum extent. Without affecting the bearing assembly accuracy and high-speed rotation operation, it can confine all the escaping liquid metal 3 within the anode structure area inside the rotor copper sleeve 7, preventing liquid metal 3 from diffusing into the core vacuum cavity. This prevents equipment arcing, insulation failure, accelerated bearing wear, and reduced overall machine life caused by liquid metal 3 leakage, and comprehensively improves the operational stability and sealing reliability of the liquid metal 3 bearing under high-speed, high-temperature, and long-term operating conditions.

[0044] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A liquid metal bearing with a sealed structure, characterized in that, include: Bushing (1); A rotating shaft (2), the end of which is rotatably disposed within the bushing (1); Liquid metal (3) fills the space between the rotating shaft (2) and the bushing (1); A flange (4) is fixedly connected to the bushing (1) and limits the axial movement of the rotating shaft (2). The flange (4) and the bushing (1) form a first sealing surface (5), and the flange (4) and the rotating shaft (2) form a second sealing surface (6). The first sealing surface (5) is provided with an anti-wetting layer (51) to inhibit the capillary permeation of the liquid metal (3) along the end face microchannel and a metal layer (52) for reacting with the liquid metal (3). The anti-wetting layer (51) and the metal layer (52) are arranged sequentially along the leakage channel of the liquid metal (3). The second sealing surface (6) is provided with a liquid-locking structure (61) to prevent leakage of the liquid metal (3); The bushing (1) and the flange (4) are also fitted with a rotor copper sleeve (7). The inner wall of the rotor copper sleeve (7) is provided with a plurality of liquid collecting ring grooves (71), and the plurality of liquid collecting ring grooves (71) are arranged along the axial direction of the rotating shaft (2). The end of the rotor copper sleeve (7) is bent inward and forms a liquid-retaining ring (72).

2. The liquid metal bearing with a sealing structure according to claim 1, characterized in that, A bent structure (53) is formed on the first sealing surface (5), and the flange (4) and the bushing (1) are fitted together at the bent structure (53).

3. The liquid metal bearing with a sealing structure according to claim 2, characterized in that, The bending structure (53) includes a sealing groove (531) provided on the bushing (1) and a sealing protrusion (532) provided on the flange (4); or, The bending structure (53) includes a sealing protrusion (532) disposed on the bushing (1) and a sealing groove (531) disposed on the flange (4), and the metal layer (52) is disposed in the sealing protrusion (532) and the sealing groove (531).

4. The liquid metal bearing with a sealing structure according to claim 3, characterized in that, The width-to-depth ratio of the sealing groove (531) is 5:1-10:1, and the depth is 0.1mm-1mm.

5. The liquid metal bearing with a sealing structure according to claim 4, characterized in that, The sealing groove (531) and the sealing protrusion (532) have rectangular cross sections.

6. The liquid metal bearing with a sealing structure according to any one of claims 1-5, characterized in that, The metal layer (52) is a soft metal, and the metal layer (52) is copper, silver or an alloy containing both.

7. The liquid metal bearing with a sealing structure according to claim 6, characterized in that, The thickness of the metal layer (52) is 5μm-50μm.

8. The liquid metal bearing with a sealing structure according to claim 1, characterized in that, The anti-wetting layer (51) is planar, and the anti-wetting layer (51) is an oxide ceramic, a carbide ceramic, or a nitride ceramic.

9. The liquid metal bearing with a sealing structure according to claim 1, characterized in that, The liquid-locking structure (61) includes a liquid-locking protrusion (611) and a liquid-locking groove (612). The rotating shaft (2) and the flange (4) are both provided with the liquid-locking protrusion (611) and the liquid-locking groove (612). The liquid-locking protrusions (611) on the rotating shaft (2) and the flange (4) are arranged in an alternating manner and are embedded in the liquid-locking grooves (612) of both.

10. The liquid metal bearing with a sealing structure according to claim 9, characterized in that, A liquid storage cavity (613) is provided between one of the liquid-locking protrusions (611) and the liquid-locking groove (612) for storing the leaked liquid metal (3).

11. The liquid metal bearing with a sealing structure according to claim 1, characterized in that, The width of the opening of the liquid collecting ring groove (71) is smaller than the width of the bottom of the groove.

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