CN216975527U

CN216975527U - X-ray tube and liquid metal bearing thereof

Info

Publication number: CN216975527U
Application number: CN202220446118.7U
Authority: CN
Inventors: 段誉
Original assignee: Weirui Technology Suzhou Co ltd
Current assignee: Weirui Technology Suzhou Co ltd
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-07-15
Anticipated expiration: 2032-03-03

Abstract

The utility model discloses a liquid metal bearing which comprises a shaft core and a shaft sleeve, wherein the shaft sleeve is rotatably sleeved on the shaft core, liquid metal is filled between the shaft core and the shaft sleeve, a boss group is arranged on the shaft core, a groove group is arranged on the shaft sleeve, and the boss group and the groove group are matched and connected with each other. The utility model can improve the axial load capacity of the liquid metal bearing on the basis of not changing the size of the liquid metal bearing.

Description

X-ray tube and liquid metal bearing thereof

Technical Field

The utility model relates to the technical field of X-ray tubes, in particular to an X-ray tube and a liquid metal bearing thereof.

Background

As the development of modern medical technology and the demand for medical diagnosis increase, higher requirements are put on the performance of the X-ray tube assembly. The bearing parts as key parts in the X-ray tube play a crucial role in the performance of the whole X-ray tube. To achieve higher anode rotation speeds (at least 12000 revolutions per minute, i.e., 200Hz) and larger anode heat capacity (at least 3.5MHU) designs, liquid metal bearings have replaced conventional ball bearings. When the X-ray tube assembly is used in a computed tomography scanner, the liquid metal bearing drives the anode target disk to rotate at a high speed and also needs to bear the centrifugal force generated by the high-speed rotation of the X-ray imaging device.

In order to improve the load capacity of the liquid metal bearing, the prior art can be improved in the following three aspects, but at the same time, some defects are brought about:

the bearing capacity is increased by reducing the gap filled with liquid metal, but the currently selected bearing gap reaches the micron level, which is a high requirement in consideration of the machinability of each part and the fit and assembly relationship between the parts, so that the gap is difficult to reduce.

The bearing capacity of the liquid metal bearing is increased by increasing the length of the liquid metal bearing-shaft core, but the shaft core is easier to deflect under the given heavy load condition, so that the surfaces of liquid metal bearing parts are contacted, and the shaft clamping phenomenon is caused.

The bearing capacity is increased by increasing the diameter of the liquid metal bearing-shaft core, but the size of the whole anode assembly is increased, and the higher-power stator coil is required to be provided to drive the liquid metal bearing to rotate at a high speed, but the external size of the X-ray tube assembly is limited by the X-ray imaging equipment, and the size cannot be increased arbitrarily.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides an X-ray tube and a liquid metal bearing thereof, wherein the axial load capacity of the metal bearing is strong.

The utility model is realized by the following technical scheme:

a liquid metal bearing comprises a shaft core and a shaft sleeve, wherein the shaft sleeve is rotatably sleeved on the shaft core, liquid metal is filled between the shaft core and the shaft sleeve, a boss group is arranged on the shaft core, a groove group is arranged on the shaft sleeve, and the boss group and the groove group are connected in a matched mode.

Further, the shaft sleeve comprises a lower shaft end cover, and the lower shaft end cover is matched and connected with the shaft core.

Further, the groove group comprises a first groove, a second groove and a third groove, and the first groove, the second groove and the third groove are arranged on the lower shaft end cover.

Further, the boss group comprises a first boss, a second boss and a third boss, the first boss is matched with the first groove, the second boss is matched with the second groove, and the third boss is matched with the third groove.

Furthermore, the shaft sleeve further comprises a side sleeve and an upper shaft end cover, wherein one end of the side sleeve is fixedly connected with the lower shaft end cover, and the other end of the side sleeve is fixedly connected with the upper shaft end cover.

Furthermore, the groove group further comprises a fourth groove, and the fourth groove is arranged at one end, close to the lower shaft end cover, of the side sleeve.

Further, the boss group further comprises a fourth boss, and the fourth boss is matched and connected with the fourth groove.

Further, the gap distance between the lower shaft end cover and the shaft core is 45-65 μm.

Further, the gap distance between the side sleeve and the shaft core is 30-50 μm, and the gap distance between the upper shaft end cover and the shaft core is 45-65 μm.

An X-ray tube comprising a liquid metal bearing as described above.

Compared with the prior art, the utility model has the advantages that:

1. the shaft core is provided with the boss group, the shaft sleeve is provided with the groove group, the boss group and the groove group are matched and connected with each other, and the shaft core and the shaft sleeve are provided with step structures, so that the gap space between the shaft core and the shaft sleeve is enlarged, liquid metal is filled in the gap, the bearing capacity in the axial direction is greatly improved, and the shaft clamping phenomenon is not easy to occur; meanwhile, the step type structural design can also ensure that the liquid metal cannot overflow under the capillary action.

2. The stepped structure design of the shaft core of the liquid metal bearing increases the liquid metal filled in the gap between the bearing and the shaft sleeve, and has good lubricating effect.

Drawings

Fig. 1 is a schematic structural diagram of an X-ray tube according to an embodiment of the present invention;

FIG. 2 is a schematic view of a liquid metal bearing according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of a liquid metal bearing according to an embodiment of the present invention.

1. A shaft core; 10. a boss group; 100. a first boss; 101. a second boss; 102. a third boss; 103. a fourth boss; 2. a shaft sleeve; 20. a groove group; 200. a first groove; 201. a second groove; 202. a third groove; 203. a fourth groove; 21. a lower shaft end cover; 210. a second mounting hole; 22. side sleeves; 220. a first fixing hole; 221. a second fixing hole; 23. an upper shaft end cover; 230. a first mounting hole; 24. a screw; 3. a liquid metal; 4. an anode target disk; 5. an anode rotor; 6. a cathode; 7. a housing.

Detailed Description

The following non-limiting detailed description of the present invention is provided in connection with the preferred embodiments and accompanying drawings. In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

As shown in fig. 1, an X-ray tube according to an embodiment of the present invention includes a housing 7 and a cathode 6, the housing 7 is fixedly connected to the cathode 6, a liquid metal bearing, an anode target disk 4 and an anode rotor 5 are disposed in the housing 7, the liquid metal bearing is rotatably disposed in the housing 7, the anode target disk 4 is fixedly connected to the anode rotor 5, the liquid metal bearing is fixedly connected to the inside of the anode target disk 4 and the inside of the anode rotor 5, and the liquid metal bearing drives the anode target disk 4 and the anode rotor 5 to rotate together at a high speed when the liquid metal bearing is in a high-speed rotation state.

As shown in fig. 2 and fig. 3, the liquid metal bearing in the X-ray tube includes a shaft core 1 and a shaft sleeve 2, the shaft sleeve 2 is rotatably sleeved on the shaft core 1, and liquid metal 3 is filled between the shaft core 1 and the shaft sleeve 2. The shaft core 1 is provided with a boss group 10, and the shaft sleeve 2 is provided with a groove group 20 matched and connected with the boss group 10. The shaft core 1 and the shaft sleeve 2 are both provided with a step structure, the number of steps is not particularly limited, the gap space between the shaft core 1 and the shaft sleeve 2 is increased, the gap is filled with the liquid metal 3, the bearing capacity in the axial direction is greatly improved, and the shaft clamping phenomenon is not easy to occur; meanwhile, the step type structural design can also ensure that the liquid metal 3 cannot overflow under the capillary action.

The shaft sleeve 2 comprises a lower shaft end cover 21, a side sleeve 22 and an upper shaft end cover 23, one end of the side sleeve 22 is fixedly connected with the lower shaft end cover 21, the other end of the side sleeve 22 is fixedly connected with the upper shaft end cover 23, and the lower shaft end cover 21, the side sleeve 22 and the upper shaft end cover 23 are all connected with the shaft core 1 in a matching mode. One end of the side sleeve 22 close to the upper shaft end cover 23 is provided with a plurality of first fixing holes 220, and one end of the side sleeve 22 close to the lower shaft end cover 21 is provided with a plurality of second fixing holes 221. The upper shaft end cover 23 is provided with a plurality of first mounting holes 230 corresponding to the first fixing holes 220; a plurality of second mounting holes 210 corresponding to the second fixing holes 221 are formed in the lower shaft end cover 21, and screws 24 sequentially penetrate through the first mounting holes 230 and the first fixing holes 220 to fix the upper shaft end cover 23 at one end of the side sleeve 22; the screw 24 also passes through the second mounting hole 210 and the second fixing hole 221 in turn to fix the lower shaft end cover 21 on the end of the side sleeve 22 far away from the upper shaft end cover 23. The upper shaft end cover 23 and the lower shaft end cover 21 are detachably fixed at two ends of the side sleeve 22, so that the shaft core 1 can be conveniently detached or replaced.

The groove group 20 includes a first groove 200, a second groove 201, a third groove 202, and a fourth groove 203, the first groove 200, the second groove 201, and the third groove 202 are disposed on the lower shaft cover 21, and the fourth groove 203 is disposed on the side sleeve 22 at an end close to the lower shaft cover 21.

The boss group 10 includes a first boss 100, a second boss 101, a third boss 102 and a fourth boss 103, the first boss 100 is coupled with the first groove 200, the second boss 101 is coupled with the second groove 201, the third boss 102 is coupled with the third groove 202, and the fourth boss 103 is coupled with the fourth groove 203.

The clearance distance d1 between the lower shaft end cover 21 and the shaft core 1 is 45-65 μm, the clearance distance d2 between the side sleeve 22 and the shaft core 1 is 30-50 μm, and the clearance distance d3 between the upper shaft end cover 23 and the shaft core 1 is 45-65 μm.

The liquid metal 3 is typically gallium and its alloys selected as the liquid metal 3 filler fluid, which is liquid at room temperature and has a sufficiently low vapor pressure at the bearing operating temperature. The heat conductivity of the liquid metal 3 can reach 100W/m.K, and the liquid metal is tightly filled in the gap between the shaft core 1 and the shaft sleeve 2, so that the heat conduction area is greatly increased, and compared with a roller bearing, the heat dissipation capability is qualitatively improved.

The liquid metal 3 is filled between the outer surface of the shaft core 1 and the inner surfaces of the lower shaft end cover 21, the side sleeve 22 and the upper shaft end cover 23, the gap distance d1 between the lower shaft end cover 21 and the shaft core 1 is 45-65 μm, the gap distance d2 between the side sleeve 22 and the shaft core 1 is 30-50 μm, the gap distance d3 between the upper shaft end cover 23 and the shaft core 1 is 45-65 μm, and the flowing liquid metal 3 is used for lubrication and is suitable for a vacuum state and can have necessary viscosity when being subjected to higher temperature. The liquid metal bearing is characterized in that the boss group 10 is arranged on the shaft core 1, the groove group 20 matched and connected with the boss group 10 is arranged on the shaft sleeve 2, and the axial load capacity of the liquid metal bearing is improved due to the step type structural design of the shaft core 1 of the liquid metal bearing. When the liquid metal bearing is in a working state, the shaft core 1 is fixed, and the shaft sleeve 2 drives the anode target disk 4 and the anode rotor 5 to do high-speed rotary motion around the shaft core 1. Due to the step type structural design of the shaft core 1, the space between the shaft core 1 and the shaft sleeve 2 is increased, namely the filled liquid metal 3 is also increased, and the supporting and lubricating of the liquid metal 3 between the shaft core 1 and the shaft sleeve 2 are indirectly improved. Due to the step-type structural design of the shaft core 1, under the high-speed rotation state of the liquid metal bearing, the supporting surfaces in the shaft center direction are increased step by step, the lubricating effect is good, and the liquid metal bearing can bear larger anode load and cannot clamp the shaft; meanwhile, the design of a step structure can also ensure that the liquid metal cannot overflow under the capillary action.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.

Claims

1. A liquid metal bearing comprises a shaft core (1) and a shaft sleeve (2), wherein the shaft sleeve (2) is rotatably sleeved on the shaft core (1), and liquid metal (3) is filled between the shaft core (1) and the shaft sleeve (2), and the liquid metal bearing is characterized in that a boss group (10) is arranged on the shaft core (1), a groove group (20) is arranged on the shaft sleeve (2), and the boss group (10) and the groove group (20) are connected in a matched mode.

2. A liquid metal bearing according to claim 1, wherein the shaft sleeve (2) comprises a lower shaft end cap (21), the lower shaft end cap (21) mating with the shaft core (1).

3. Liquid metal bearing according to claim 2, wherein the groove set (20) comprises a first groove (200), a second groove (201) and a third groove (202), the first groove (200), the second groove (201) and the third groove (202) being provided on the lower shaft end cap (21).

4. A liquid metal bearing according to claim 3, wherein the set of lands (10) comprises a first land (100), a second land (101) and a third land (102), the first land (100) mating with a first groove (200), the second land (101) mating with a second groove (201), the third land (102) mating with a third groove (202).

5. A liquid metal bearing according to claim 2, wherein the sleeve (2) further comprises a side sleeve (22) and an upper shaft end cap (23), one end of the side sleeve (22) being fixedly connected to the lower shaft end cap (21) and the other end being fixedly connected to the upper shaft end cap (23).

6. Liquid metal bearing according to claim 5, wherein the groove set (20) further comprises a fourth groove (203), the fourth groove (203) being provided at an end of the side sleeve (22) close to the lower shaft end cap (21).

7. A liquid metal bearing according to claim 6, wherein the set of lands (10) further comprises a fourth land (103), the fourth land (103) mating with the fourth groove (203).

8. A liquid metal bearing according to claim 2, characterized in that the gap distance between the lower shaft end cap (21) and the shaft core (1) is 45-65 μm.

9. Liquid metal bearing according to claim 5, characterized in that the side sleeve (22) and the shaft core (1) have a gap distance of 30-50 μm and the upper shaft end cap (23) and the shaft core (1) have a gap distance of 45-65 μm.

10. An X-ray tube comprising a liquid metal bearing according to any one of claims 1 to 9.