CN216975555U

CN216975555U - Liquid metal bearing

Info

Publication number: CN216975555U
Application number: CN202220585727.0U
Authority: CN
Inventors: 段誉
Original assignee: Weirui Technology Suzhou Co ltd
Current assignee: Weirui Technology Suzhou Co ltd
Priority date: 2022-03-17
Filing date: 2022-03-17
Publication date: 2022-07-15
Anticipated expiration: 2032-03-17

Abstract

The utility model discloses a liquid metal bearing, which comprises a bearing rod and a bearing sleeve, wherein the bearing sleeve is rotatably sleeved on the bearing rod, liquid metal is filled between the bearing rod and the bearing sleeve, a circulation hole is formed in the center of the bearing rod, a flow guide pipe is arranged in the center of the circulation hole, and a flow guide piece is arranged between the circulation hole and the flow guide pipe. The liquid metal bearing provided by the utility model has high cooling rate and good heat dissipation effect.

Description

Liquid metal bearing

Technical Field

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

Background

The X-ray tube comprises a cathode and an anode which are positioned in a high-vacuum closed shell, and electrons of the cathode of the X-ray tube bombard an anode target disc at high speed under the action of a high-voltage electric field, so that bremsstrahlung and characteristic radiation are generated, namely X-rays are formed. In the process of generating X-ray, only 1% of the kinetic energy of electrons is converted into X-ray, and more than 99% is converted into heat energy. Temperatures of 2600 ℃ to 2700 ℃ can even be reached in the region of the electron bombardment, so that anode assemblies which can be rotated at high rotational speeds are required in order to bombard the cathode electrons onto an endless track of an anode target disk. The anode assembly structure is typically supported by ball bearings and rotated at high speed under the drive of the stator windings to distribute the heat generated at the focal track. In some advanced medical X-ray imaging systems, higher power and higher rotational speed exposures are required, which places stringent requirements on the ball bearings.

Liquid metal bearings, which use liquid metal to replace conventional balls, are currently available instead of ball bearings, achieving high load capacity and high heat transfer capacity by increasing the amount of contact area. Its advantages include low noise, liquid metal filling the gap between bearing sleeve and bearing rod, no friction sound of ball in track and no impact sound of ball under high-speed rotation. Gallium and its alloys are typically used as liquid metals because they tend to be liquid at room temperature and have a sufficiently low vapor pressure at operating temperatures to meet the stringent high vacuum requirements of X-ray tubes. However, the heat of the anode target disk can thereby be quickly transferred to the liquid metal and also to the bearing component. This heat can cause the temperature of the bearing components themselves to rise, and excessive temperatures can cause the bearing and the expansion of the liquid metal to cause failure such as seizure or leakage of the liquid metal.

The design of current liquid metal bearing is usually with an oil pipe insert inside the cooling of bearing rod, but because the bearing rod size is very narrow and small, the flow direction of insulating oil is also uncontrolled, so produce the disturbance each other easily, lead to the velocity of flow of insulating oil not high, the radiating efficiency is not good.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the utility model provides the liquid metal bearing which is high in cooling rate and good in heat dissipation effect.

The utility model is realized by the following technical scheme:

the liquid metal bearing comprises a bearing rod and a bearing sleeve, wherein the bearing sleeve is rotatably sleeved on the bearing rod, liquid metal is filled between the bearing rod and the bearing sleeve, a circulation hole is formed in the center of the bearing rod, a flow guide pipe is arranged in the center of the circulation hole, and a flow guide part is arranged between the circulation hole and the flow guide pipe.

Further, the flow guide piece is of an integrally formed structure.

Furthermore, the inner side of the flow guide piece is fixedly connected with the outer wall of the flow guide pipe, and the outer side of the flow guide piece is fixedly connected with the inner wall of the flow through hole.

Furthermore, the guide piece comprises a plurality of guide plates which are uniformly distributed, and the guide plates form a radial shape together.

Furthermore, a diversion trench is formed between the diversion plates and used for the circulation of the insulating oil.

Furthermore, a guide block is arranged on the inner wall of the circulation hole and below the flow guide pipe, the upper surface of the guide block is smooth, and when the insulating oil enters from the flow guide pipe and touches the guide block on the inner wall, the guide block contacts the insulating oil and changes the flowing direction of the insulating oil.

Furthermore, the orthographic projection of the guide pipe on the inner wall covers the orthographic projection of the guide block on the inner wall, and the guide pipe and the guide block are spaced from each other.

Furthermore, the height of the guide block is 0.45-0.55 percent of the interval length between the guide pipe and the inner wall, and the included angle between the inclined surface of the guide block and the central axis of the guide block is 30-45 degrees.

Furthermore, the interval between the flow guide pipe and the inner wall is 12-18mm, and the interval between the flow guide piece and the inner wall is 12-18 mm.

Furthermore, the inner diameter of the flow guide pipe is 14-18mm, and the inner diameter of the flow hole is 19-25 mm.

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

1. through set up the water conservancy diversion spare between flow through hole and honeycomb duct, the guiding gutter among the water conservancy diversion spare realizes the water conservancy diversion to insulating oil, has avoided the disturbance of each other of insulating oil, thereby lower flow resistance realizes the high-speed flow of insulating oil, and insulating oil circulates in the bearing rod along the guiding gutter direction, constantly takes away the heat to realize high-speed cooling.

2. The flow guide part is an integrally formed structural part and comprises a plurality of flow guide plates, and flow guide grooves for insulating oil circulation are formed among the flow guide plates, so that the structure is simple and the cost is low; the diversion part is welded with the bearing rod, so that the diversion part is tightly attached to the bearing rod, the processing is simple, the existing bearing structure is not influenced, the diversion part can be made of high-thermal-conductivity metals such as copper and silver and alloys thereof, and good thermal conductivity is guaranteed.

Drawings

FIG. 1 is a schematic structural diagram of a liquid metal bearing according to an embodiment of the present invention;

FIG. 2 is a top view of a liquid metal bearing;

fig. 3 is a sectional view taken along line a-a of fig. 2.

1. A bearing rod; 2. a bearing housing; 20. side sleeves; 21. an end cap; 3. a liquid metal; 4. a flow-through hole; 40. an inner wall; 41. a groove; 5. a flow guide pipe; 50. an outer wall; 51. an oil inlet; 6. a flow guide member; 60. an inner side; 61. an outer side; 62. a baffle; 63. a diversion trench; 7. a guide block; 70. an inclined surface; 71. a central shaft; 72. a convex portion; 8. and (4) screws.

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 orientation 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 such 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 to 3, a liquid metal bearing according to an embodiment of the present invention includes a bearing rod 1, a bearing housing 2, a liquid metal 3, a guide tube 5, a flow guide member 6, and a guide block 7, wherein the bearing housing 2 is rotatably sleeved on the bearing rod 1, the liquid metal 3 is filled between the bearing rod 1 and the bearing housing 2, a flow through hole 4 is formed at a center of the bearing rod 1, the guide tube 5 is disposed at a center of the flow through hole 4, a surface of the guide block 7 is smooth and disposed on an inner wall 40 of the flow through hole 4 and corresponds to a lower portion of the guide tube 5, the flow guide member 6 is disposed between the flow through hole 4 and the guide tube 5, an inner side 60 of the flow guide member 6 is fixedly connected to an outer wall 50 of the guide tube 5, and an outer side 61 of the flow guide member 6 is fixedly connected to the inner wall 40 of the flow through hole 4.

Specifically, the insulating oil enters the inside of the bearing rod 1 along the Y direction from the flow guide pipe 5, and when the insulating oil hits the guide block 7 on the inner wall 40, the guide block 7 contacts the insulating oil and changes the flow direction of the insulating oil, so that the insulating oil continues to flow out of the flow guide 6 along the Y direction. The flow guide piece 6 realizes flow guide of the insulating oil, avoids mutual disturbance of the insulating oil, improves the flow rate of the insulating oil, and further improves the cooling effect of the insulating oil on the metal bearing.

The bearing sleeve 2 comprises a side sleeve 20 and an end cover 21, and the side sleeve 20 and the end cover 21 are detachably connected through a screw 8, so that the maintenance or replacement of the bearing rod 1 in the later period is facilitated.

The circulation hole 4 is provided with a groove 41, and the guide block 7 is fixedly arranged in the groove 41, wherein the inner diameter d of the circulation hole 4 is 19-25 mm.

The draft tube 5 is provided with an oil inlet 51, wherein the inner diameter c of the draft tube 5 is 14-18mm, the orthographic projection of the draft tube 5 on the inner wall 40 covers the orthographic projection of the guide block 7 on the inner wall 40, the draft tube 5 and the guide block 7 are mutually spaced, and the spacing a is 12-18 mm.

The guide piece 6 is of an integrally formed structure and comprises a plurality of uniformly distributed guide plates 62, the guide plates 62 jointly form a radial shape, a circulation guide groove 63 for insulating oil is formed between the guide plates 62, and the guide piece is simple in structure and low in manufacturing cost. The water conservancy diversion spare 6 is through doing the welding with bearing rod 1, guarantees to tightly laminate with bearing rod 1, and processing is simple and does not influence current bearing arrangement to water conservancy diversion spare 6 material can be for copper, high thermal conductivity metal such as silver and alloy, guarantees good heat conductivity.

Specifically, the guide member 6 and the guide block 7 are spaced from each other by a distance b of 12-18 mm. The diversion trench 63 in the diversion piece 6 realizes the diversion of the insulating oil, avoids the mutual disturbance of the insulating oil, realizes the high-speed flow of the insulating oil by lower flow resistance, circulates in the bearing rod 1 along the direction of the diversion trench 63, and continuously takes away heat, thereby realizing the quick cooling.

The guide block 7 is provided with a convex part 72, and the convex part 72 is matched with the groove 41.

The height of the guide block 7 is 0.45-0.55 of the length of the interval a between the draft tube 5 and the inner wall 40, and the included angle between the inclined surface 70 of the guide block 7 and the central axis 71 is 30-45 degrees.

Hereinafter, a specific example of a liquid metal bearing will be described. Wherein, the outer diameter e of the bearing is 70-80mm, the outer diameter f of the bearing rod 1 is 27-35mm, the interval a between the draft tube 5 and the inner wall 40 is 12-18mm, the interval b between the draft tube 6 and the inner wall 40 is 12-18mm, the inner diameter c of the draft tube 5 is 14-18mm, the inner diameter d of the circulation hole 4 is 19-25mm, and the height h of the guide block 7 is 0.45-0.55 of the length of the interval a between the draft tube 5 and the inner wall 40. The inclined surface 70 of the guide block 7 forms an angle of 30 to 45 degrees with the central axis 71 thereof.

When the X-ray tube is in a working state, the anode target disc conducts heat to the liquid metal bearing, the insulating oil enters from the oil inlet 51 of the guide pipe 5 and enters the inside of the bearing rod 1 along the Y direction, when the insulating oil touches the guide block 7 on the inner wall 40, the guide block 7 contacts the insulating oil and changes the flowing direction of the insulating oil, the insulating oil can flow out of the bearing rod 1 along the Y direction and along the guide groove 63, the contact surface between the insulating oil and the bearing rod 1 is greatly increased due to the design of the guide groove 63, and a stable insulating oil flowing loop is formed. The flow guide piece 6 realizes the flow guide of the insulating oil, avoids the mutual disturbance of the insulating oil, improves the flow rate of the insulating oil, further continuously takes away the heat at the bearing, and finally reduces the temperature of the whole liquid metal bearing. The liquid metal bearing can improve the fluidity of insulating oil, and has high cooling rate and good heat dissipation effect.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood 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. The liquid metal bearing is characterized by comprising a bearing rod (1) and a bearing sleeve (2), wherein the bearing sleeve (2) is rotatably sleeved on the bearing rod (1), liquid metal (3) is filled between the bearing rod (1) and the bearing sleeve (2), a circulation hole (4) is formed in the center of the bearing rod (1), a guide pipe (5) is arranged in the center of the circulation hole (4), and a guide piece (6) is arranged between the circulation hole (4) and the guide pipe (5).

2. A liquid metal bearing according to claim 1, characterized in that the flow guide (6) is of one-piece construction.

3. Liquid metal bearing according to claim 1, wherein the inner side (60) of the flow guide (6) is fixedly connected to the outer wall (50) of the flow guide tube (5), and the outer side (61) of the flow guide (6) is fixedly connected to the inner wall (40) of the flow opening (4).

4. A liquid metal bearing according to claim 1, characterized in that the flow guiding element (6) comprises a number of evenly distributed flow guiding plates (62), which flow guiding plates (62) together form a radial pattern.

5. A liquid metal bearing according to claim 4, characterized in that the flow guiding plates (62) form flow guiding grooves (63) between them, which flow guiding grooves (63) are used for the passage of insulating oil.

6. The liquid metal bearing according to claim 1, wherein a guide block (7) is provided on an inner wall (40) of the flow hole (4) corresponding to a lower portion of the flow guide tube (5), an upper surface of the guide block (7) is smooth, and when the insulating oil enters from the flow guide tube (5) and hits the guide block (7) on the inner wall (40), the guide block (7) contacts the insulating oil and changes a flow direction of the insulating oil.

7. Liquid metal bearing according to claim 6, wherein the orthographic projection of the flow duct (5) on the inner wall (40) covers the orthographic projection of the guide block (7) on the inner wall (40), and the flow duct (5) and the guide block (7) are spaced apart from each other.

8. A liquid metal bearing according to claim 6, wherein the height of the guide block (7) is 0.45-0.55 of the distance between the draft tube (5) and the inner wall (40), and the angle between the inclined surface (70) of the guide block (7) and its central axis (71) is 30-45 degrees.

9. Liquid metal bearing according to claim 6, wherein the flow guide (5) is spaced from the inner wall (40) by 12-18mm and the flow guide (6) is spaced from the inner wall (40) by 12-18 mm.

10. A liquid metal bearing according to claim 1, characterized in that the inner diameter of the flow tube (5) is 14-18mm and the inner diameter of the flow opening (4) is 19-25 mm.