Anti-overflow 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 an anti-overflow liquid metal bearing suitable for an X-ray tube and a CT bulb tube. The bearing sleeve is used for being coaxially connected with a rotating anode of the X-ray tube, the bearing sleeve is provided with a sleeve cavity with an opening in one side, the bearing sleeve is rotatably arranged on the center shaft in a sleeving mode, and a liquid film gap exists between the bearing sleeve and the center shaft; the sealing cover is arranged on the central shaft in a clearance sleeving manner and is fixedly arranged at the opening end of the bearing sleeve so as to axially restrain the central shaft; an annular flange plate is arranged at one end of a barrel-shaped body of the rotor, an anti-overflow corrugated groove is formed in the inner circumferential wall of the barrel-shaped body and comprises a plurality of annular grooves, the circle center line of each annular groove coincides with the axis of the barrel-shaped body, and all the annular grooves are sequentially arranged in the axial direction of the barrel-shaped body. According to the utility model, small metal liquid drops leaked from a shaft seal gap can be retained in the rotor, so that the sparking phenomenon is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of X-ray tubes, in particular to an anti-overflow liquid metal bearing suitable for X-ray tubes and a CT tube. 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, resistant to high temperatures, in a fluid state at room temperature, and have a high boiling point... until the liquid metal alloy was invented, 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 leads to the degradation of bearing performance and then the bearing is stuck. In addition, liquid metal leaking into the vacuum tube cavity of the X-ray tube will cause the X-ray tube to spark, thus affecting the normal use of the CT machine. Utility Model Content

[0008] In view of the above-mentioned shortcomings of the prior art, the technical problem to be solved by the utility model is to provide an anti-overflow liquid metal bearing and a CT tube suitable for an X-ray tube, which can retain small metal droplets leaking from the shaft seal gap inside the rotor, prevent the small metal droplets from escaping into the vacuum environment of the vacuum tube shell, thereby avoiding sparks.

[0009] In order to solve the above technical problems, the utility model provides an anti-overflow type liquid metal bearing suitable for an X-ray tube, wherein the anti-overflow type liquid metal bearing is arranged in a vacuum tube shell of the X-ray tube, and the anti-overflow type liquid metal bearing comprises:

[0010] The central axis of the stator is formed and arranged horizontally;

[0011] 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 central axis, there is a liquid film gap between the bearing sleeve and the central axis, and the liquid film gap is used to fill liquid metal;

[0012] A sealing cover in an annular shape, the sealing cover gap is sleeved on the central shaft and fixedly arranged on the open end of the bearing sleeve to axially constrain the central shaft, and a shaft sealing gap is formed between the inner peripheral edge of the sealing cover and the outer peripheral wall of the central shaft;

[0013] The rotor comprises a cylindrical body with an inner cavity axially passing through, an annular flange is arranged at one end of the cylindrical body, the annular flange is sleeved on the central axis and coaxially fixed to the sealing cover, an anti-overflow corrugated groove is arranged on the inner circumferential wall of the cylindrical body, the anti-overflow corrugated groove comprises a plurality of annular grooves, the center line of each annular groove coincides with the axis of the cylindrical body, and all the annular grooves are arranged in sequence along the axial direction of the cylindrical body;

[0014] When the rotor rotates at high speed relative to the central shaft, the rotor, the cover and the bearing sleeve rotate synchronously at high speed, and the small metal droplets leaking from the shaft seal gap are retained in the anti-overflow corrugated groove.

[0015] Furthermore, the cross section of the anti-overflow corrugated groove is sawtooth-shaped.

[0016] Furthermore, the cross section of the annular groove is triangular, and two groove walls of the annular groove are respectively a vertical wall and an inclined wall, and the inclined wall is inclined in a direction close to the annular flange.

[0017] Furthermore, the angle between the vertical wall and the inclined wall is 30 to 40 degrees.

[0018] Furthermore, a liquid metal adsorption layer is provided on the groove wall of the annular groove.

[0019] Furthermore, a liquid metal wetting layer is provided on the groove wall of multiple annular grooves of the anti-overflow corrugated groove, and a liquid metal non-wetting layer is provided on the groove wall of the remaining annular grooves of the anti-overflow corrugated groove, and the liquid metal non-wetting layer and the liquid metal wetting layer are alternately distributed in sequence.

[0020] Furthermore, an anti-overflow groove is provided at the connection between the sealing cover and the annular flange, and the anti-overflow groove is located on a side of the shaft sealing gap close to the rotor.

[0021] Furthermore, the two groove walls of the anti-overflow groove are respectively a first groove wall and a second groove wall, the first groove wall is inclined and connected to the inner circumference of the cover, and the second groove wall is vertically arranged and provided with a protrusion, which is located at the opening of the anti-overflow groove.

[0022] The utility model also includes a CT tube, comprising:

[0023] A vacuum tube shell, wherein a tube cavity of the vacuum tube shell forms a vacuum environment;

[0024] A cathode insulating end sealing assembly, which is arranged at one end of the vacuum tube shell;

[0025] A cathode assembly, which is disposed on the cathode insulating end sealing assembly and is located in the tube cavity;

[0026] An anode insulating end sealing assembly, the anode insulating end sealing assembly is arranged at the other end of the vacuum tube shell;

[0027] The rotary anode assembly comprises a rotary anode and the anti-overflow liquid metal bearing suitable for an X-ray tube, wherein the rotary anode is detachably connected to the bearing sleeve of the anti-overflow liquid metal bearing.

[0028] As described above, the utility model of the anti-overflow liquid metal bearing and CT tube suitable for X-ray tubes has the following beneficial effects: since a shaft seal gap is formed between the inner circumference of the cover and the outer circumferential wall of the central axis, small metal droplets may escape from the shaft seal gap. Since the central axis is arranged horizontally, the escaped small metal droplets will fall downward, and the direct channel for the small metal droplets after leakage is the inner cavity of the cylindrical body of the rotor. Based on this, an anti-overflow corrugated groove is provided on the inner circumferential wall of the cylindrical body, and the anti-overflow corrugated groove includes a plurality of annular grooves, the center line of each annular groove coincides with the axis of the cylindrical body, and all the annular grooves are arranged in sequence along the axial direction of the cylindrical body. With such an arrangement, when the rotor rotates at a high speed, the inner circumferential wall of the cylindrical body will directly contact the small metal droplets. More importantly, the overflow-proof corrugated groove includes a plurality of annular grooves, the center line of each annular groove coincides with the axis of the cylindrical body, and all the annular grooves are arranged in sequence along the axial direction of the cylindrical body, and the small metal droplets leaking from the shaft seal gap are retained in the overflow-proof corrugated groove, preventing the small metal droplets from escaping into the vacuum environment of the vacuum shell, so that the small metal droplets are effectively attached to the inside of the rotor. Therefore, the overflow-proof liquid metal bearing suitable for X-ray tubes of the utility model can retain the small metal droplets leaking from the shaft seal gap inside the rotor, preventing the small metal droplets from escaping into the vacuum environment of the vacuum shell, thereby avoiding the occurrence of sparking. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Shown is a cross-sectional schematic diagram of an anti-overflow liquid metal bearing suitable for an X-ray tube of the utility model;

[0030] Figure 2 Display as Figure 1 Enlarged view of part A in the middle;

[0031] Figure 3 Display as Figure 1 Enlarged view of part B in the middle.

[0032] Component number description

[0033] 1 Center axis

[0034] 2 Bearing sleeve

[0035] 21 Cavity

[0036] 3 Capping

[0037] 4 Shaft seal clearance

[0038] 5 Rotor

[0039] 51 cylinder

[0040] 52 Annular flange

[0041] 53 Anti-overflow bellows

[0042] 531 Annular groove

[0043] 531a Vertical wall

[0044] 531b Sloped wall

[0045] 6 Rotating anode

[0046] 7 Metal droplets

[0047] 8 Anti-overflow groove

[0048] 81 First groove wall

[0049] 82 Second groove wall

[0050] 83 Raised part DETAILED DESCRIPTION

[0051] 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.

[0052] 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.

[0053] 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:

[0054] A vacuum tube shell, wherein a tube cavity of the vacuum tube shell forms a vacuum environment;

[0055] A cathode insulating end sealing assembly, which is arranged at one end of the vacuum tube shell;

[0056] 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;

[0057] An anode insulating end sealing assembly, the anode insulating end sealing assembly is arranged at the other end of the vacuum tube shell;

[0058] Rotating anode assembly (see Figure 1 ), the rotating anode assembly includes a rotating anode 6 and an anti-overflow liquid metal bearing suitable for an X-ray tube, the rotating anode 6 is detachably connected to a bearing sleeve 2 of the anti-overflow liquid metal bearing, the rotating anode 6 is used to be bombarded by an electron beam to generate X-rays, and the anti-overflow liquid metal bearing is used to achieve high-speed rotation of the rotating anode 6 relative to the anode insulating end seal assembly.

[0059] 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 is the anti-overflow liquid metal bearing suitable for X-ray tubes, which can effectively prevent the liquid metal from escaping to various areas of the tube cavity of the vacuum tube shell, and more effectively solve the leakage problem of the liquid metal. Figure 1 , Figure 2 as well as Figure 3 As shown, the anti-overflow type liquid metal bearing is arranged in the vacuum tube shell of the X-ray tube, and the anti-overflow type liquid metal bearing includes:

[0060] The central axis 1 constituting the stator is arranged horizontally;

[0061] A bearing sleeve 2, 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 21 with a single-side opening, the bearing sleeve 2 is rotatably sleeved on the central shaft 1, and a liquid film gap exists between the bearing sleeve 2 and the central shaft 1, and the liquid film gap is used for filling liquid metal;

[0062] A sealing cover 3 in an annular shape, which is sleeved on the central shaft 1 and fixed to the open end of the bearing sleeve 2 to axially constrain the central shaft 1, and a shaft sealing gap 4 is formed between the inner circumference of the sealing cover 3 and the outer circumferential wall of the central shaft 1;

[0063] The rotor 5 comprises a cylindrical body 51 with an inner cavity axially passing through, an annular flange 52 is provided at one end of the cylindrical body 51, the annular flange 52 is sleeved on the central axis 1 and coaxially fixed to the cover 3, an anti-overflow corrugated groove 53 is provided on the inner peripheral wall of the cylindrical body 51, the anti-overflow corrugated groove 53 comprises a plurality of annular grooves 531, the center line of each annular groove 531 coincides with the axis of the cylindrical body 51, and all the annular grooves 531 are arranged in sequence along the axial direction of the cylindrical body 51;

[0064] When the rotor 5 rotates at a high speed relative to the central shaft 1 , the rotor 5 , the sealing cover 3 and the bearing sleeve 2 rotate synchronously at a high speed, and the small metal droplets 7 leaking from the shaft seal gap 4 are retained in the anti-overflow corrugated groove 53 .

[0065] In the utility model, since a shaft seal gap 4 is formed between the inner circumference of the cover 3 and the outer circumferential wall of the central shaft 1, small metal droplets 7 may escape from the shaft seal gap 4. Since the central shaft 1 is arranged horizontally, the escaped small metal droplets 7 will fall downward, and the direct channel for the small metal droplets 7 after leakage is the inner cavity of the cylindrical body 51 of the rotor 5. Based on this, an anti-overflow corrugated groove 53 is provided on the inner circumferential wall of the cylindrical body 51, and the anti-overflow corrugated groove 53 includes a plurality of annular grooves 531, and the center line of each annular groove 531 coincides with the axis of the cylindrical body 51, and all the annular grooves 531 are arranged in sequence along the axial direction of the cylindrical body 51. With such a configuration, when the rotor 5 rotates at a high speed, the inner circumferential wall of the cylindrical body 51 will directly contact the small metal droplets 7. More importantly, the anti-overflow corrugated groove 53 includes a plurality of annular grooves 531, the center line of each annular groove 531 coincides with the axis of the cylindrical body 51, and all the annular grooves 531 are arranged in sequence along the axial direction of the cylindrical body 51. The small metal droplets 7 leaking from the shaft seal gap 4 are retained in the anti-overflow corrugated groove 53, preventing the small metal droplets 7 from escaping into the vacuum environment of the vacuum tube shell, so that the small metal droplets 7 are effectively attached to the inside of the rotor 5.

[0066] Therefore, the overflow-proof liquid metal bearing suitable for X-ray tubes of the utility model can retain small metal droplets leaking from the shaft seal gap inside the rotor, preventing the small metal droplets from escaping into the vacuum environment of the vacuum tube shell, thereby avoiding sparking.

[0067] Furthermore, in order to further improve the retention capacity of the rotor for small metal droplets, the cross section of the anti-overflow corrugated groove 53 is serrated. The serrated structural design makes it easy for liquid metal to enter the anti-overflow corrugated groove 53 and not easy to escape again, which can effectively reduce the risk of liquid metal overflowing again.

[0068] Furthermore, in order to further improve the retention capacity of the rotor for small metal droplets, the cross section of the annular groove 531 is triangular, and the two groove walls of the annular groove 531 are respectively a vertical wall 531a and an inclined wall 531b, and the inclined wall 531b is inclined toward the direction close to the annular flange 52. Preferably, the angle between the vertical wall 531a and the inclined wall 531b is 30 to 40 degrees. Most preferably, the angle between the vertical wall 531a and the inclined wall 531b is 34 degrees.

[0069] Furthermore, a liquid metal adsorption layer is provided on the groove wall of the annular groove 531. The coating material of the liquid metal adsorption layer can be a material that reacts with liquid metal, that is, a material that easily reacts with gallium or gallium-based alloy liquid metal. The material that easily reacts with gallium or gallium-based alloy liquid metal is an existing material and will not be described in detail here.

[0070] Furthermore, in order to reduce the risk of liquid metal leakage, a liquid metal wetting layer is provided on the groove wall of the multiple annular grooves 531 of the anti-overflow corrugated groove 53, and a liquid metal non-wetting layer is provided on the groove wall of the remaining annular grooves 531 of the anti-overflow corrugated groove 53, and the liquid metal non-wetting layer and the liquid metal wetting layer are alternately distributed in sequence.

[0071] Further, in order to reduce the risk of liquid metal leakage, an anti-overflow groove 8 is provided at the connection between the cover 3 and the annular flange 52, and the anti-overflow groove 8 is located on the side of the shaft seal gap 4 close to the rotor 5. Preferably, the two groove walls of the anti-overflow groove 8 are respectively a first groove wall 81 and a second groove wall 82, the first groove wall 81 is inclined and connected to the inner circumference of the cover 3, and the second groove wall 82 is vertically arranged and provided with a protrusion 83, and the protrusion 83 is located at the opening of the anti-overflow groove 8.

[0072] In summary, the utility model can retain the small metal droplets leaking from the shaft seal gap inside the rotor, preventing the small metal droplets from escaping into the vacuum environment of the vacuum tube shell, thereby preventing the occurrence of sparks. Therefore, the utility model effectively overcomes various shortcomings of the prior art and has a high industrial utilization value.

[0073] 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. An anti-overflow liquid metal bearing suitable for an X-ray tube, the anti-overflow liquid metal bearing being arranged in a vacuum tube shell of the X-ray tube, the anti-overflow liquid metal bearing comprising: A central axis (1) constituting the stator, wherein the central axis (1) is arranged horizontally; 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) has a sleeve cavity (21) with a single-side opening, the bearing sleeve (2) is rotatably sleeved on the central shaft (1), a liquid film gap exists between the bearing sleeve (2) and the central shaft (1), and the liquid film gap is used for filling liquid metal; A sealing cover (3) in the form of an annular ring, the sealing cover (3) being sleeved on the central shaft (1) with a gap and fixedly arranged on the open end of the bearing sleeve (2) to axially constrain the central shaft (1), and a shaft sealing gap (4) being formed between the inner peripheral edge of the sealing cover (3) and the outer peripheral wall of the central shaft (1); The invention is characterized in that the rotor (5) comprises a cylindrical body (51) with an inner cavity axially passing therethrough, an annular flange (52) is provided at one end of the cylindrical body (51), the annular flange (52) is sleeved on the central axis (1) with a gap and is coaxially fixed to the sealing cover (3), an anti-overflow corrugated groove (53) is provided on the inner peripheral wall of the cylindrical body (51), the anti-overflow corrugated groove (53) comprises a plurality of annular grooves (531), the center line of each annular groove (531) coincides with the axis of the cylindrical body (51), and all the annular grooves (531) are arranged in sequence along the axial direction of the cylindrical body (51); When the rotor (5) rotates at a high speed relative to the central shaft (1), the rotor (5), the sealing cover (3) and the bearing sleeve (2) rotate synchronously at a high speed, and the small metal droplets (7) leaking from the shaft seal gap (4) are retained in the anti-overflow corrugated groove (53).

2. The anti-overflow liquid metal bearing suitable for an X-ray tube according to claim 1, characterized in that: The cross section of the anti-overflow corrugated groove (53) is sawtooth-shaped.

3. The anti-overflow liquid metal bearing suitable for an X-ray tube according to claim 2, characterized in that: The cross section of the annular groove (531) is triangular, and the two groove walls of the annular groove (531) are respectively a vertical wall (531a) and an inclined wall (531b), and the inclined wall (531b) is inclined in a direction close to the annular flange (52).

4. The anti-overflow liquid metal bearing suitable for an X-ray tube according to claim 3, characterized in that: The included angle between the vertical wall (531a) and the inclined wall (531b) is 30 to 40 degrees.

5. The anti-overflow liquid metal bearing suitable for an X-ray tube according to claim 1, characterized in that: A liquid metal adsorption layer is provided on the groove wall of the annular groove (531).

6. The anti-overflow liquid metal bearing for X-ray tubes according to claim 1, characterized in that: A liquid metal wetting layer is provided on the groove wall of the plurality of annular grooves (531) of the anti-overflow corrugated groove (53), and a liquid metal non-wetting layer is provided on the groove wall of the remaining annular grooves (531) of the anti-overflow corrugated groove (53), and the liquid metal non-wetting layer and the liquid metal wetting layer are alternately distributed in sequence.

7. The anti-overflow liquid metal bearing for X-ray tubes according to claim 1, characterized in that: An anti-overflow groove (8) is provided at the connection between the sealing cover (3) and the annular flange (52), and the anti-overflow groove (8) is located on a side of the shaft sealing gap (4) close to the rotor (5).

8. The anti-overflow liquid metal bearing for X-ray tubes according to claim 7, characterized in that: The two groove walls of the anti-overflow groove (8) are respectively a first groove wall (81) and a second groove wall (82); the first groove wall (81) is arranged obliquely and connected to the inner peripheral edge of the cover (3); the second groove wall (82) is arranged vertically and is provided with a protrusion (83); the protrusion (83) is located at the opening of the anti-overflow groove (8).

9. 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 an anti-overflow liquid metal bearing suitable for an X-ray tube as claimed in any one of claims 1 to 8, wherein the rotating anode (6) is detachably connected to a bearing sleeve (2) of the anti-overflow liquid metal bearing.

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