Leakage-proof enhanced liquid metal bearing suitable for X-ray tube and CT bulb tube

Abstract

The utility model relates to the technical field of X-ray tubes, and provides a leakproof enhanced liquid metal bearing suitable for an X-ray tube and a CT bulb tube, the leakproof enhanced liquid metal bearing suitable for the X-ray tube comprises a bearing sleeve which is rotatably sleeved on a first shaft section and is in backstop fit with one end face of a thrust plate; the sealing cover is provided with a central through hole, and the bearing sleeve and the sealing cover jointly and axially restrain the thrust plate; the flow guide microgroove structure is arranged on the peripheral wall of the first shaft section, and all flow guide microgroove groups are sequentially arranged at intervals in the axial direction of the first shaft section; each flow guide microgroove group comprises a plurality of herringbone microgrooves which are circumferentially arrayed by taking the axis of the first shaft section as a circle center line, and a herringbone boss is formed between every two adjacent herringbone microgrooves in the circumferential direction; the groove width of each branch groove is gradually narrowed in the direction from the free end to the convergence end, and the groove depth of each branch groove is gradually shallower in the direction from the free end to the convergence end. According to the utility model, the bearing capacity can be maintained, and the leakage risk of liquid metal can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of X-ray tubes, in particular to a leak-proof enhanced liquid metal bearing and a CT tube suitable for X-ray tubes. Background Art

[0002] X-ray tubes are key components of medical equipment such as X-ray machines and CT machines. Under the action of external high voltage, they can generate radiation such as X-rays. When an object is placed between the X-ray tube and the detector, the radiation will pass through the object and hit the detector. Since the internal structure of the object will affect the spatial variation of the radiation, the detector receives the radiation change signal and can convert the radiation change into image information through the system. The image information can be used to evaluate the internal structure of the object, which can be either a living object or an inanimate object.

[0003] The X-ray tube includes a cathode and an anode in a high vacuum sealed environment. Under the action of high voltage, the cathode of the X-ray tube generates electrons that are accelerated and bombarded onto the anode target disk, thereby generating X-rays. In this process, only 1% of the electron kinetic energy is converted into X-rays, and the remaining 99% of the energy is converted into heat. Therefore, the temperature in the electron bombardment area can even reach 2600℃~2700℃. In order to improve heat dissipation, the high-speed rotating anode target disk can effectively disperse the heat accumulation at the focal position.

[0004] The rotating anode assembly mainly consists of two parts: the anode target and the bearing system, in which the bearing system includes the stator and the rotor. The anode target is fixed on the rotor and placed in a vacuum. The stator coil is energized to generate a magnetic field to drive the rotor to rotate. Mechanically, the rotor is generally divided into two types: rolling bearing rotor and sliding bearing rotor. However, structurally speaking, the rotor as a moving part will inevitably produce mechanical vibration, which is transmitted to the shaft through the rigid ball and finally to the sleeve component. There is almost no buffering and shock absorption in the middle, so the rotation of the ball bearing will inevitably have a relatively significant noise. In terms of materials, the bearing assembly is a pure metal composite structure, which is sensitive to thermal deformation. Excessive deformation will cause the ball and the inner and outer grooves to wear more and even the bearing to get stuck. The temperature that the shaft can withstand generally does not exceed 600℃, which requires that the connection between the anode and the bearing rotor must use materials with low thermal conductivity. In addition, the point contact between the ball and the inner and outer grooves also weakens the heat transfer from the anode target to the shaft to a certain extent, which also requires the anode target to have higher thermal radiation efficiency and heat storage capacity. Therefore, as high-end medical X-ray imaging systems require higher power and faster speeds, the advantages of ball bearings in meeting the needs of higher-end systems have become less and less obvious.

[0005] The application of liquid hydrodynamic sliding bearings solves these problems well, but the introduction of this type of bearing is not achieved overnight. The fluid material necessary for the sliding bearing to form a liquid film has long been a problem for the use of this technology in the field of electric vacuum. It needs to be conductive, high temperature resistant, fluid at room temperature, and have a high boiling point... until the liquid metal alloy was developed, it can finally make its debut. This liquid metal alloy is generally composed of several low-melting-point metals such as gallium, tin, and indium. It is a fluid at room temperature, has good conductivity, and has an extremely high boiling point (close to 2000°C), so it is not easy to volatilize. At the same time, it is a metal itself with excellent thermal conductivity. Therefore, liquid metal bearings are currently the main method to replace ball bearings.

[0006] Before the liquid metal bearing operates, gallium or gallium-based alloy liquid metal must be injected into the micron-level gap between the bearing rod and the bearing sleeve to replace the traditional ball. Gallium or gallium-based alloy is liquid at room temperature and has a sufficiently low vapor pressure at the operating temperature to meet the high vacuum environment requirements of the X-ray tube. Liquid metal bearings have a long trial life due to their low wear characteristics.

[0007] At present, existing liquid metal bearings cannot completely prevent the leakage of liquid metal. The final failure of liquid metal bearings is often due to the leakage of liquid metal, which causes the bearing performance to deteriorate and then causes the bearing to become stuck. At the same time, the leakage of liquid metal can cause the X-ray tube to ignite, thus affecting the normal use of the CT machine.

[0008] The internal surface micro-groove structure of the liquid metal bearing of the existing X-ray tube generally adopts the design of herringbone spiral grooves, for example Figure 1 As shown, the shapes of the grooves in the existing patent documents (application numbers: CN202410157646.4, CN202410124115.5 and CN202410157646.4) are all of equal width and depth along their travel direction, that is, the groove 01 is of equal width and depth along its own extension direction, and the boss 02 is also of equal width and depth along its own extension direction. When the X-ray tube is working, the liquid metal bearing has a convergence gap due to eccentricity, and the rotation of the rotor produces a wedge-shaped dynamic pressure effect. The herringbone spiral grooves of equal width and depth change the flow direction of the liquid metal in the liquid metal bearing. The alternating steps formed by the grooves and the platforms change the pressure distribution of the liquid metal bearing, and high and low pressure alternating areas are formed at the ends of the liquid metal bearing. Although the risk of liquid metal leakage is reduced, the anti-leakage effect on liquid metal is still relatively limited. Utility Model Content

[0009] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a leak-proof enhanced liquid metal bearing and CT tube suitable for X-ray tubes, which can maintain the bearing capacity while more effectively reducing the risk of liquid metal leakage.

[0010] In order to solve the above technical problems, the utility model provides a leak-proof enhanced liquid metal bearing suitable for an X-ray tube, wherein the leak-proof enhanced liquid metal bearing is arranged in a vacuum tube shell of the X-ray tube, and the leak-proof enhanced liquid metal bearing comprises:

[0011] The central axis of the stator is composed of a shaft body, a thrust plate is arranged on the outer peripheral wall of the shaft body, and the shaft body is divided into a first shaft section and a second shaft section by the thrust plate;

[0012] A bearing sleeve, the bearing sleeve is used for coaxially connecting the rotating anode of the X-ray tube, the bearing sleeve has a sleeve cavity with a single-side opening, the bearing sleeve is rotatably sleeved on the first shaft section and cooperates with an end surface stopper of the thrust plate;

[0013] A cover with a central through hole, the cover gap is sleeved on the second shaft section and is sealed to the open end of the bearing sleeve, the cover cooperates with the other end surface stopper of the thrust plate, the bearing sleeve and the cover jointly axially constrain the thrust plate, and a shaft seal gap is formed between the inner peripheral wall of the cover and the outer peripheral wall of the second shaft section;

[0014] A flow guiding micro groove structure, the flow guiding micro groove structure is arranged on the outer peripheral wall of the first shaft segment, the flow guiding micro groove structure includes a plurality of flow guiding micro groove groups, all of which are arranged in sequence along the axial direction of the first shaft segment; each flow guiding micro groove group includes a plurality of herringbone micro grooves in a circular array with the axis of the first shaft segment as the center line, a herringbone boss is formed between two circumferentially adjacent herringbone micro grooves, the herringbone micro groove includes two branch grooves that converge and connect at an angle, the convergence and connection of the two branch grooves constitutes a convergence end of the herringbone micro groove, one end of the branch groove away from the convergence end constitutes a free end, and the direction of the convergence end of the herringbone micro groove is consistent with the rotation direction of the bearing sleeve relative to the central axis; the groove width of each branch groove gradually narrows in the direction from the free end to the convergence end, and the groove depth of each branch groove gradually shallows in the direction from the free end to the convergence end;

[0015] There are liquid film gaps between the bearing sleeve and the shaft body and the thrust plate respectively, and there is a liquid film gap between the cover and the thrust plate, and the liquid film gap is used to fill liquid metal.

[0016] Furthermore, the circumferential groove of the outer peripheral wall of the first shaft section where the free end is located accounts for 0.25-0.5, and the groove of the outer peripheral wall of the first shaft section where the converging end is located accounts for 0.15-0.33.

[0017] Furthermore, the ratio between the groove width of the free end and the groove depth of the free end is 1 to 2, and the ratio between the groove width of the converging end and the groove depth of the converging end is 0.5 to 1.5.

[0018] Furthermore, the leakproof enhanced liquid metal bearing suitable for the X-ray tube also includes a cylindrical rotor, which is coaxially fixed to the cover.

[0019] Furthermore, the leakproof enhanced liquid metal bearing suitable for X-ray tubes also includes a sealing ring, which is sealed and connected to the bearing sleeve and the cover respectively, and the sealing ring gap is sleeved on the thrust plate, and a liquid film gap exists between the sealing ring and the thrust plate.

[0020] Furthermore, the sealing cover comprises a sealing flange portion and a shaft sealing sleeve portion integrally formed with the sealing flange portion, and the sealing flange portion is indirectly sealed and connected to the bearing sleeve.

[0021] Furthermore, an anti-overflow groove is provided on the inner peripheral wall of the shaft sealing sleeve.

[0022] Furthermore, the bearing sleeve is in a cap shape, and includes a cap body and a brim portion integrally formed with the cap body, and the brim portion is indirectly sealed and connected to the cover.

[0023] Furthermore, the cap body comprises a cap barrel having a hollow cavity and a cap top cover detachably arranged at a top port of the cap barrel.

[0024] The utility model also provides a CT tube, comprising:

[0025] A vacuum tube shell, wherein a tube cavity of the vacuum tube shell forms a vacuum environment;

[0026] A cathode insulating end sealing assembly, which is arranged at one end of the vacuum tube shell;

[0027] A cathode assembly, which is disposed on the cathode insulating end sealing assembly and is located in the tube cavity;

[0028] An anode insulating end sealing assembly, the anode insulating end sealing assembly is arranged at the other end of the vacuum tube shell;

[0029] The rotary anode assembly comprises a rotary anode and the leakproof enhanced liquid metal bearing suitable for an X-ray tube, wherein the rotary anode is detachably connected to the bearing sleeve of the leakproof enhanced liquid metal bearing.

[0030] As described above, the leak-proof enhanced liquid metal bearing and CT tube suitable for X-ray tubes of the utility model have the following beneficial effects: in the leak-proof enhanced liquid metal bearing of the utility model, a thrust plate is provided on the outer peripheral wall of the shaft body, and the bearing sleeve and the cover jointly axially constrain the thrust plate. With such an arrangement, the bearing sleeve will not axially move relative to the central axis, which is beneficial to the stable high-speed rotation of the rotating anode. More importantly, the flow guiding micro groove structure is arranged on the outer peripheral wall of the first shaft segment, and the flow guiding micro groove structure includes a plurality of flow guiding micro groove groups, and all the flow guiding micro groove groups are arranged in sequence along the axial direction of the first shaft segment; each flow guiding micro groove group includes a plurality of herringbone micro grooves in a circular array with the axis of the first shaft segment as the center line, and a herringbone boss is formed between two circumferentially adjacent herringbone micro grooves, and the herringbone micro grooves include two branch grooves that converge and connect at an angle, and the convergence and connection of the two branch grooves constitute the convergence end of the herringbone micro groove, and the end of the branch groove away from the convergence end constitutes a free end, and the direction of the convergence end of the herringbone micro groove is consistent with the rotation direction of the bearing sleeve relative to the central axis. In this way, a plurality of supporting areas can be formed; specifically, each flow guiding micro groove group provides two supporting areas, that is, the number of supporting areas is twice the number of the flow guiding micro groove groups. When the bearing sleeve rotates at a high speed relative to the central axis, in each supporting area, the liquid metal flows from the free end of the branch groove to the convergence end of the branch groove, and then refluxes from the adjacent herringbone boss, and so on. Of course, some liquid metal also flows circumferentially. The most important thing is that the width of each branch groove gradually narrows in the direction from the free end to the converging end; the depth of each branch groove gradually shallows in the direction from the free end to the converging end. With this arrangement, on the one hand, the first shaft section will not lose too much load-bearing capacity; on the other hand, a large negative pressure will be formed at the free end, especially at the free end closest to the thrust plate, and the proportion of the circumferential grooves on the outer peripheral wall of the first shaft section where the free end is located is greater than the proportion of the grooves on the outer peripheral wall of the first shaft section where the converging end is located, which can reduce the risk of liquid metal leakage. Therefore, the leak-proof enhanced liquid metal bearing of the utility model can more effectively reduce the risk of liquid metal leakage while maintaining the load-bearing capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The circumferential development diagram of the micro-groove structure on the inner surface of the existing liquid metal bearing is shown;

[0032] Figure 2 A three-dimensional diagram showing a leak-proof enhanced liquid metal bearing suitable for an X-ray tube according to the present invention;

[0033] Figure 3 A cross-sectional view of a leak-proof enhanced liquid metal bearing suitable for an X-ray tube according to the utility model is shown;

[0034] Figure 4An exploded view of the leak-proof enhanced liquid metal bearing suitable for an X-ray tube of the utility model is shown;

[0035] Figure 5 Shown as a perspective view of the central axis 1;

[0036] Figure 6 Shown is a side view of the central axis 1;

[0037] Figure 7 A circular flow diagram of liquid metal is shown with the central axis 1;

[0038] Figure 8 The circumferential expansion diagram of the guide microgroove group of the leakage-proof enhanced liquid metal bearing is shown.

[0039] Description of component numbers: central axis 1, shaft body 11, first shaft section 111, second shaft section 112, thrust plate 12, bearing sleeve 2, cap body 21, cap cylinder 211, cap top cover 212, cap brim 22, sealing cover 3, sealing flange 31, shaft sealing sleeve 32, anti-overflow groove 33, guide microgroove structure 4, guide microgroove group 41, herringbone microgroove 411, branch groove 411a, converging end 411b, free end 411c, herringbone boss 412, rotor 5, rotating anode 6, sealing ring 7. DETAILED DESCRIPTION

[0040] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0041] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the utility model. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the utility model without substantial change of the technical content.

[0042] The utility model provides a CT tube (the overall structure of the CT tube is not shown in the figure), the CT tube is an X-ray tube, and the CT tube comprises:

[0043] A vacuum tube shell, wherein a tube cavity of the vacuum tube shell forms a vacuum environment;

[0044] A cathode insulating end sealing assembly, which is arranged at one end of the vacuum tube shell;

[0045] A cathode assembly, which is arranged on the cathode insulating end sealing assembly and is located in the tube cavity, and is used to emit an electron beam;

[0046] An anode insulating end sealing assembly, the anode insulating end sealing assembly is arranged at the other end of the vacuum tube shell;

[0047] Rotating anode assembly (such as Figure 2 , Figure 3 as well as Figure 4 The rotating anode assembly includes a rotating anode 6 and a leakproof enhanced liquid metal bearing suitable for an X-ray tube, and the rotating anode 6 is detachably connected to a bearing sleeve 2 of the leakproof enhanced liquid metal bearing. The rotating anode 6 is used to be bombarded by an electron beam to generate X-rays, and the leakproof enhanced liquid metal bearing is used to achieve high-speed rotation of the rotating anode 6 relative to the anode insulation end seal assembly.

[0048] In the rotating anode assembly, the rotating anode 6 is an existing structure and will not be described in detail here; the main innovation of the utility model lies in the leak-proof enhanced liquid metal bearing suitable for the X-ray tube, which can improve its own bearing capacity on the one hand; on the other hand, it can reduce the risk of liquid metal leakage.

[0049] Recombination Figure 5 , Figure 6 , Figure 7 as well as Figure 8 ,exist Figure 7 In the figure, the solid curved arrow indicates the flow direction of the liquid metal, and the non-solid straight arrow indicates the leakage direction of the liquid metal.

[0050] The leak-proof enhanced liquid metal bearing suitable for X-ray tubes is now introduced in detail:

[0051] The leakproof enhanced liquid metal bearing is arranged in a vacuum tube shell of an X-ray tube, and the leakproof enhanced liquid metal bearing comprises:

[0052] The central shaft 1 of the stator comprises a shaft body 11, a thrust plate 12 is arranged on the outer peripheral wall of the shaft body 11, and the shaft body 11 is divided into a first shaft section 111 and a second shaft section 112 by the thrust plate 12;

[0053] The bearing sleeve 2 is used for coaxially connecting the rotating anode 6 of the X-ray tube. The bearing sleeve 2 has a sleeve cavity with a single-side opening. The bearing sleeve 2 is rotatably sleeved on the first shaft section 111 and cooperates with an end surface stopper of the thrust plate 12;

[0054] A cover 3 with a central through hole, the cover 3 is sleeved on the second shaft section 112 and is sealed to the open end of the bearing sleeve 2, the cover 3 cooperates with the other end surface stopper of the thrust plate 12, the bearing sleeve 2 and the cover 3 jointly axially constrain the thrust plate 12, and a shaft seal gap is formed between the inner peripheral wall of the cover 3 and the outer peripheral wall of the second shaft section 112;

[0055] The flow guiding micro groove structure 4 is arranged on the outer peripheral wall of the first shaft segment 111, and the flow guiding micro groove structure 4 includes a plurality of flow guiding micro groove groups 41, and all the flow guiding micro groove groups 41 are sequentially arranged at intervals along the axial direction of the first shaft segment 111; each flow guiding micro groove group 41 includes a plurality of herringbone micro grooves 411 in a circular array with the axis of the first shaft segment 111 as the center line, and a herringbone boss 412 is formed between two circumferentially adjacent herringbone micro grooves 411, and the herringbone micro groove 411 includes two branch grooves 411a that converge and communicate at an angle, and the two branch grooves 411a are connected to each other. The convergence connection of the branch grooves 411a constitutes the convergence end 411b of the herringbone microgroove 411, and the end of the branch groove 411a away from the convergence end 411b constitutes the free end 411c. The direction of the convergence end 411b of the herringbone microgroove 411 is consistent with the rotation direction of the bearing sleeve 2 relative to the central axis 1; the groove width of each branch groove 411a gradually narrows in the direction from the free end 411c to the convergence end 411b, and the groove depth of each branch groove 411a gradually shallows in the direction from the free end 411c to the convergence end 411b;

[0056] There are liquid film gaps between the bearing sleeve 2 and the shaft body 11 and the thrust plate 12 respectively, and there is a liquid film gap between the cover 3 and the thrust plate 12. The liquid film gap is used to fill liquid metal.

[0057] In the leak-proof enhanced liquid metal bearing of the utility model, a thrust plate 12 is provided on the outer peripheral wall of the shaft body 11, and the bearing sleeve 2 and the cover 3 jointly axially constrain the thrust plate 12. With this arrangement, the bearing sleeve 2 will not axially move relative to the central axis 1, which is beneficial to the stable high-speed rotation of the rotating anode 6. More importantly, the guide microgroove structure 4 is arranged on the outer peripheral wall of the first shaft segment 111, and the guide microgroove structure 4 includes a plurality of guide microgroove groups 41, and all the guide microgroove groups 41 are arranged in sequence along the axial direction of the first shaft segment 111; each guide microgroove group 41 includes a plurality of herringbone microgrooves 411 in a circular array with the axis of the first shaft segment 111 as the center line, and a herringbone boss 412 is formed between two circumferentially adjacent herringbone microgrooves 411, and the herringbone microgroove 411 includes two branch grooves 411a that converge and connect at an angle, and the converging connection of the two branch grooves 411a constitutes a converging end 411b of the herringbone microgroove 411, and the end of the branch groove 411a away from the converging end 411b constitutes a free end 411c, and the orientation of the converging end 411b of the herringbone microgroove 411 is consistent with the rotation direction of the bearing sleeve 2 relative to the central axis 1. In this way, a plurality of supporting areas can be formed; specifically, each guide microgroove group 41 provides two supporting areas, that is, the number of supporting areas is twice the number of guide microgroove groups 41. Figure 7 When the bearing sleeve 2 rotates at high speed relative to the central axis 1, in each supporting area, the liquid metal will circulate roughly in the direction of the liquid flow as shown in the figure, that is, the liquid metal flows from the free end 411c of the branch groove 411a to the converging end 411b of the branch groove 411a, and then flows back from the adjacent herringbone boss 412, and the cycle continues. Of course, some of the liquid metal also flows circumferentially. The most important thing is that the groove width of each branch groove 411a gradually narrows in the direction from the free end 411c to the converging end 411b; the groove depth of each branch groove 411a gradually shallows in the direction from the free end 411c to the converging end 411b. With such a configuration, on the one hand, the first shaft segment 111 will not lose too much load-bearing capacity; on the other hand, the free end 411c will form a large negative pressure, especially the free end 411c closest to the thrust plate 12 will also form a large negative pressure, and the proportion of the circumferential groove on the outer peripheral wall of the first shaft segment 111 where the free end 411c is located is greater than the proportion of the groove on the outer peripheral wall of the first shaft segment 111 where the converging end 411b is located, thereby reducing the risk of leakage of liquid metal.

[0058] Therefore, the leak-proof enhanced liquid metal bearing of the present invention can maintain the load-bearing capacity while more effectively reducing the risk of liquid metal leakage.

[0059] Furthermore, in order to further reduce the risk of liquid metal leakage, the circumferential groove of the outer peripheral wall of the first shaft section 111 where the free end 411c is located accounts for 0.25-0.5, and the groove of the outer peripheral wall of the first shaft section 111 where the converging end 411b is located accounts for 0.15-0.33. Figure 6 The angle corresponding to the free end 411c of the branch groove 411a is 15 degrees. On the outer peripheral wall of the first shaft segment 111 where the free end 411c is located, the angle corresponding to the herringbone boss 412 is also 15 degrees. In this way, the circumferential groove of the outer peripheral wall of the first shaft segment 111 where the free end 411c is located accounts for 0.5.

[0060] Furthermore, in order to further reduce the risk of liquid metal leakage, the ratio between the groove width of the free end 411c and the groove depth of the free end 411c is 1-2, and the ratio between the groove width of the converging end 411b and the groove depth of the converging end 411b is 0.5-1.5.

[0061] Furthermore, in order to drive the cover 3 and the bearing sleeve 2 to rotate synchronously, thereby driving the rotating anode 6 to rotate relative to the central axis 1, the leak-proof enhanced liquid metal bearing suitable for the X-ray tube also includes a cylindrical rotor 5, which is coaxially fixed to the cover 3.

[0062] Furthermore, in order to facilitate assembly and adjust the liquid film gaps on both sides of the thrust plate 12 in the axial direction, the leakproof enhanced liquid metal bearing suitable for the X-ray tube further includes a sealing ring 7, which is sealed and connected to the bearing sleeve 2 and the cover 3 respectively, and the sealing ring 7 is gap-jacketed on the thrust plate 12, and a liquid film gap exists between the sealing ring 7 and the thrust plate 12. The sealing ring 7 has a variety of thicknesses, which can be selected according to preset requirements.

[0063] Furthermore, in order to facilitate the detachable connection of the cover 3 to the open end of the bearing sleeve 2, the cover 3 includes a sealing flange portion 31 and a shaft sealing sleeve portion 32 integrally formed with the sealing flange portion 31, and the sealing flange portion 31 is indirectly sealed and connected to the bearing sleeve 2.

[0064] Furthermore, in order to further reduce the risk of liquid metal leakage, an anti-overflow groove 33 is provided on the inner peripheral wall of the shaft sealing sleeve 32 .

[0065] Furthermore, the bearing sleeve 2 is in a cap shape, and includes a cap body 21 and a brim 22 integrally formed on the cap body 21, and the brim 22 is indirectly sealed and connected to the cover 3. Specifically, the brim 22 has a plurality of connection holes, and the outer edge of the brim 22 is indirectly sealed and connected to the outer edge of the sealing flange 31 through a sealing ring 7.

[0066] Furthermore, in order to facilitate disassembly and maintenance, the cap body 21 includes a cap barrel 211 having a hollow cavity and a cap top cover 212 detachably disposed at the top end of the cap barrel 211 .

[0067] In summary, the utility model is applicable to the leak-proof enhanced liquid metal bearing of the X-ray tube and the CT tube, which can maintain the bearing capacity while more effectively reducing the risk of liquid metal leakage. Therefore, the utility model effectively overcomes various shortcomings of the prior art and has a high industrial utilization value.

[0068] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A leakproof enhanced liquid metal bearing suitable for an X-ray tube, characterized in that: The leakproof enhanced liquid metal bearing is arranged in a vacuum tube shell of an X-ray tube, and the leakproof enhanced liquid metal bearing comprises: The central axis (1) of the stator is formed, the central axis (1) comprising a shaft body (11), a thrust plate (12) is provided on the outer peripheral wall of the shaft body (11), and the shaft body (11) is divided into a first shaft section (111) and a second shaft section (112) by the thrust plate (12); A bearing sleeve (2), the bearing sleeve (2) is used for coaxially connecting to a rotating anode (6) of an X-ray tube, the bearing sleeve (2) having a sleeve cavity with a single-side opening, the bearing sleeve (2) being rotatably sleeved on the first shaft section (111) and cooperating with an end surface stopper of a thrust plate (12); A cover (3) having a central through hole, the cover (3) being sleeved on the second shaft section (112) in a clearance and being sealed to the open end of the bearing sleeve (2), the cover (3) cooperating with the other end surface stopper of the thrust plate (12), the bearing sleeve (2) and the cover (3) jointly axially constraining the thrust plate (12), and a shaft seal gap being formed between the inner peripheral wall of the cover (3) and the outer peripheral wall of the second shaft section (112); A flow guiding micro groove structure (4) is provided on the outer peripheral wall of a first shaft section (111), the flow guiding micro groove structure (4) comprises a plurality of flow guiding micro groove groups (41), all of the flow guiding micro groove groups (41) are sequentially arranged at intervals along the axial direction of the first shaft section (111); each flow guiding micro groove group (41) comprises a plurality of herringbone-shaped micro grooves (411) in a circular array with the axis of the first shaft section (111) as the center line, a herringbone-shaped boss (412) is formed between two circumferentially adjacent herringbone-shaped micro grooves (411), the herringbone-shaped micro grooves (4111) comprising two branch grooves (411a) that converge and communicate at an angle, the two branch grooves The convergence connection point of the branch grooves (411a) constitutes a convergence end (411b) of the herringbone microgrooves (411), and one end of the branch grooves (411a) away from the convergence end (411b) constitutes a free end (411c), and the direction of the convergence end (411b) of the herringbone microgrooves (411) is consistent with the rotation direction of the bearing sleeve (2) relative to the central axis (1); the groove width of each branch groove (411a) gradually narrows in the direction from the free end (411c) to the convergence end (411b), and the groove depth of each branch groove (411a) gradually shallows in the direction from the free end (411c) to the convergence end (411b); There are liquid film gaps between the bearing sleeve (2) and the shaft body (11) and the thrust plate (12), respectively, and there is a liquid film gap between the cover (3) and the thrust plate (12), and the liquid film gap is used to fill liquid metal.

2. The leakproof enhanced liquid metal bearing suitable for an X-ray tube according to claim 1, characterized in that: The circumferential groove of the outer peripheral wall of the first shaft section (111) where the free end (411c) is located accounts for 0.25 to 0.5, and the groove of the outer peripheral wall of the first shaft section (111) where the converging end (411b) is located accounts for 0.15 to 0.

33.

3. The leakproof enhanced liquid metal bearing suitable for an X-ray tube according to claim 1, characterized in that: The ratio between the groove width of the free end (411c) and the groove depth of the free end (411c) is 1 to 2, and the ratio between the groove width of the converging end (411b) and the groove depth of the converging end (411b) is 0.5 to 1.

5.

4. The leakproof enhanced liquid metal bearing suitable for an X-ray tube according to claim 1, characterized in that: The leakproof enhanced liquid metal bearing suitable for an X-ray tube further comprises a cylindrical rotor (5), and the rotor (5) is coaxially fixedly arranged on the sealing cover (3).

5. The leakproof enhanced liquid metal bearing suitable for X-ray tubes according to claim 1, characterized in that: The leakproof enhanced liquid metal bearing suitable for an X-ray tube further comprises a sealing ring (7), the sealing ring (7) being respectively sealedly connected to the bearing sleeve (2) and the sealing cover (3), the sealing ring (7) being gap-coated on the thrust plate (12), and a liquid film gap being present between the sealing ring (7) and the thrust plate (12).

6. The leakproof enhanced liquid metal bearing suitable for an X-ray tube according to claim 1, characterized in that: The sealing cover (3) comprises a sealing flange portion (31) and a shaft sealing sleeve portion (32) integrally formed with the sealing flange portion (31); the sealing flange portion (31) is indirectly sealed and connected to the bearing sleeve (2).

7. The leakproof enhanced liquid metal bearing suitable for an X-ray tube according to claim 6, characterized in that: An anti-overflow groove (33) is provided on the inner peripheral wall of the shaft sealing sleeve (32).

8. The leakproof enhanced liquid metal bearing suitable for an X-ray tube according to claim 1, characterized in that: The bearing sleeve (2) is in the shape of a cap, and comprises a cap body (21) and a cap brim (22) integrally formed with the cap body (21), and the cap brim (22) is indirectly sealed and connected to the cover (3).

9. The leakproof enhanced liquid metal bearing suitable for an X-ray tube according to claim 8, characterized in that: The cap body (21) comprises a cap barrel (211) having a hollow cavity and a cap top cover (212) detachably arranged at a top end of the cap barrel (211).

10. A CT tube, characterized in that: include: A vacuum tube shell, wherein a tube cavity of the vacuum tube shell forms a vacuum environment; A cathode insulating end sealing assembly, which is arranged at one end of the vacuum tube shell; A cathode assembly, which is disposed on the cathode insulating end sealing assembly and is located in the tube cavity; An anode insulating end sealing assembly, the anode insulating end sealing assembly is arranged at the other end of the vacuum tube shell; A rotating anode assembly, the rotating anode assembly comprising a rotating anode (6) and a leakproof enhanced liquid metal bearing suitable for an X-ray tube as claimed in any one of claims 1 to 9, wherein the rotating anode (6) is detachably connected to a bearing sleeve (2) of the leakproof enhanced liquid metal bearing.

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