Liquid metal bearing for CT bulb tube

Abstract

The invention relates to the technical field of X-ray tubes, in particular to a liquid metal bearing for a CT bulb tube, which comprises a shaft core, a shaft sleeve and an intercepting mechanism, the shaft sleeve is coaxially and rotatably arranged outside the shaft core, and the end of the shaft sleeve is in sliding sealing with the shaft sleeve through a sealing ring. An isosceles trapezoid ring groove is formed in the center of the inner wall of the shaft sleeve, a plurality of rectangular penetrating grooves are formed in the inner wall of the isosceles trapezoid ring groove, and the multiple sets of intercepting mechanisms are arranged in the corresponding rectangular penetrating grooves and can intercept chippings along with rotation of the shaft sleeve. Each intercepting mechanism comprises a hollow block and a partition plate; the hollow blocks are arranged in the corresponding rectangular penetrating grooves, the center of the side, close to the shaft core, of each hollow block is provided with a strip-shaped groove communicated with the interior of the corresponding hollow block, the rectangular frames are arranged in the corresponding strip-shaped grooves, and the center of the interior of each rectangular frame is provided with a partition plate. Through cooperation of the isosceles trapezoid ring groove and the right trapezoid ring groove, chippings can be intercepted step by step, so that the running stability of the bearing is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of X-ray tubes, and in particular to a liquid metal bearing for a CT tube. Background Art

[0002] The X-ray tube consists of a cathode and an anode located in a high vacuum closed shell. Under the action of a high voltage electric field, the electrons in the cathode of the X-ray tube bombard the anode target at high speed, thereby generating bremsstrahlung and characteristic radiation, namely, forming X-rays.

[0003] Currently, commercial tubes on the market are mainly composed of two types of bearings: liquid metal bearings and ball bearings. Among them, liquid metal bearings are the preferred accessories for high heat capacity CT tubes due to their many advantages such as high speed, long life and quietness.

[0004] The basic principle of liquid metal bearings is that when the rotor rotates, the liquid metal between the rotor and the stator gathers to the gap between the stator and the rotor through the herringbone groove texture on the surface of the stator and finally forms a liquid with a certain film thickness, which greatly reduces the friction between the stator and the rotor. In the existing liquid metal structure, when the bearing rotates at a high speed, the liquid metal stored in the guide groove will eventually gather in the middle of the herringbone groove through the pumping effect of the herringbone groove. The faster the speed, the more obvious the pumping effect. However, when the bearing speed is not enough, the debris caused by the rigid friction between the stator and the rotor will spread to the rotor end along with the liquid metal due to the centrifugal force, which can easily cause the bearing to get stuck. Summary of the invention

[0005] The main purpose of the present application is to provide a liquid metal bearing for a CT tube, which can gradually intercept debris through the cooperation of isosceles trapezoidal annular grooves and right-angled trapezoidal annular grooves, thereby ensuring the stability of the bearing operation.

[0006] To achieve the above-mentioned purpose, the present application provides a liquid metal bearing for a CT tube, comprising a shaft core, a shaft sleeve and an interception mechanism; the shaft sleeve is coaxially and rotatably arranged outside the shaft core, and the end of the shaft sleeve is slidably sealed with the shaft sleeve through a sealing ring; a cavity for storing liquid metal is formed between the shaft sleeve, the shaft core and the sealing ring; an isosceles trapezoidal annular groove is arranged at the center of the inner wall of the sleeve, and a plurality of rectangular through grooves are equidistantly arranged on the inner wall of the isosceles trapezoidal annular groove along the axial direction, and there are multiple groups of interception mechanisms, which are arranged in corresponding rectangular through grooves and can intercept debris as the shaft sleeve rotates; each group of interception mechanisms includes a hollow block and a partition plate; the hollow block is arranged in the corresponding rectangular through groove, and a strip groove connected to the inside of the hollow block is arranged at the center of one side of each hollow block close to the shaft core, and a rectangular frame is arranged in the corresponding strip groove, and a partition plate is arranged at the center of the inner part of each rectangular frame.

[0007] Preferably, arc-shaped guide plates are arranged on both sides of one end of the partition plate close to the hollow block, and one end of each arc-shaped guide plate away from the partition plate faces the outer wall of the corresponding rectangular frame.

[0008] Preferably, the outer wall of the shaft core is provided with a plurality of herringbone guide grooves along the axial direction.

[0009] Preferably, the inner wall of the sleeve is mirror-imaged with a plurality of right-angled trapezoidal annular grooves, the right-angled trapezoidal annular grooves are located on both sides of the isosceles trapezoidal annular groove, and the inclined surface of each right-angled trapezoidal annular groove faces the corresponding inclined surface of the isosceles trapezoidal annular groove.

[0010] Preferably, arc-shaped guiding surfaces are provided on both sides of one end of each partition plate away from the hollow block.

[0011] Preferably, a first annular plate is provided at the edge of the sealing ring, a second annular plate is provided at one end of the first annular plate away from the sealing plate, and the second annular plate abuts against the outer wall of the shaft sleeve.

[0012] Preferably, an annular retaining groove is provided on the inner wall of the sealing ring.

[0013] Preferably, a heat dissipation hole is provided at the center of the shaft core.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. The present application provides an isosceles trapezoidal annular groove at the center of the inner wall of the sleeve. The isosceles trapezoidal annular groove can not only store liquid metal, but also utilize the centrifugal force of the liquid metal to discharge the debris generated by the rigid friction between the sleeve and the shaft core at low speed into the isosceles trapezoidal annular groove when the sleeve rotates, thereby reducing the content of debris during the circulation of liquid metal and avoiding the accumulation of debris; and the debris can follow the liquid metal along the rectangular frame into the hollow block, thereby intercepting the debris, further preventing the debris from participating in the circulation of liquid metal, and ensuring the stability of the sleeve rotation.

[0016] 2. The present application is provided with a plurality of right-angled trapezoidal annular grooves. When there are a lot of debris, the metal debris can be pressed into the right-angled trapezoidal grooves by centrifugal force during the liquid metal circulation process. Due to the larger tangential flow resistance in the right-angled trapezoidal annular grooves, the metal debris is prevented from continuing to move with the liquid metal flow and does not enter the next liquid metal flow circulation, thereby gradually intercepting the debris and ensuring the stability of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting a part of this application are used to provide a further understanding of this application, so that other features, purposes and advantages of this application become more obvious. The schematic embodiment drawings and their descriptions of this application are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0018] Figure 1 is a stereogram of the present invention;

[0019] Figure 2 It is a right side view of the present invention;

[0020] Figure 3 yes Figure 2 Plane section view along AA direction;

[0021] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;

[0022] Figure 5 is a front view of the present invention;

[0023] Figure 6 yes Figure 5 A partial enlarged view of point C in the middle;

[0024] Figure 7 yes Figure 6 A partial enlarged view of point D in the middle.

[0025] The numbers in the above figure are:

[0026] 1-shaft core; 11-cavity; 12-herringbone guide groove; 13-heat dissipation hole;

[0027] 2-shaft sleeve; 21-sealing ring; 211-first annular plate; 212-second annular plate; 213-annular retention groove; 22-isosceles trapezoidal annular groove; 23-rectangular through groove; 24-right-angled trapezoidal annular groove;

[0028] 3-interception mechanism; 31-hollow block; 311-strip groove; 32-rectangular frame; 33-partition plate; 331-arc guide plate; 332-arc guide surface. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0030] See also Figures 1 to 7As shown, a liquid metal bearing for a CT tube comprises a shaft core 1, a shaft sleeve 2 and an interception mechanism 3; the shaft sleeve 2 is coaxially rotatably arranged outside the shaft core 1, and the end of the shaft sleeve 2 is slidably sealed with the shaft sleeve 2 through a sealing ring 21; a cavity 11 for storing liquid metal is formed between the shaft sleeve 2, the shaft core 1 and the sealing ring 21; an isosceles trapezoidal annular groove 22 is arranged at the center of the inner wall of the shaft sleeve 2, and a plurality of rectangular through grooves 23 are equidistantly arranged on the inner wall of the isosceles trapezoidal annular groove 22 along the axial direction, and the interception mechanism There are multiple groups of interception mechanisms 3, the interception mechanisms 3 are arranged in the corresponding rectangular through grooves 23 and can intercept the debris as the shaft sleeve 2 rotates; each group of interception mechanisms 3 includes a hollow block 31 and a partition plate 33; the hollow block 31 is arranged in the corresponding rectangular through groove 23, and a strip groove 311 communicating with the inside of the hollow block 31 is arranged at the center of one side of each hollow block 31 close to the shaft core 1, and the rectangular frame 32 is arranged in the corresponding strip groove 311, and a partition plate 33 is arranged at the center of the inside of each rectangular frame 32.

[0031] The cavity 11 is filled with liquid metal, which can form a liquid film of a certain thickness between the sleeve 2 and the shaft core 1 when the sleeve 2 rotates, thereby reducing the friction between the sleeve 2 and the shaft core 1. However, when the bearing speed is not enough, rigid friction will be generated between the sleeve 2 and the shaft core 1, and the resulting debris will spread to the end of the shaft core 1 along with the liquid metal due to centrifugal force, which is very likely to cause the bearing to get stuck.

[0032] Based on this situation, by providing an isosceles trapezoidal annular groove 22 at the center of the inner wall of the sleeve 2, the isosceles trapezoidal annular groove 22 can not only store the liquid metal, but also, when the sleeve 2 rotates, the centrifugal force of the liquid metal can be used to discharge the debris generated by the rigid friction between the sleeve 2 and the shaft core 1 at low speed into the isosceles trapezoidal annular groove 22, thereby reducing the content of debris during the circulation of the liquid metal, thereby concentrating the debris and avoiding the accumulation of debris; and during the rotation of the sleeve 2, the liquid metal can contact the partition plate 33 and enter the hollow block 31 along the partition plate 33, so that the debris It can follow the liquid metal along the rectangular frame 32 into the interior of the hollow block 31, and under the action of the centrifugal force of the liquid metal, the debris can fit the inner wall of the hollow block 31 away from the shaft core 1, thereby intercepting the debris, further preventing the debris from participating in the circulation of the liquid metal, ensuring the stability of the rotation of the sleeve 2, and when the liquid metal enters the interior of the hollow block 31, the liquid metal originally located in the hollow block 31 is squeezed, so that it can be discharged through the other side of the partition plate 33, thereby timely replenishing the liquid metal in the cavity 11, ensuring the filling degree of the liquid metal in the cavity 11.

[0033] See also Figure 7 As shown, arc guide plates 331 are provided on both sides of one end of the partition plate 33 close to the hollow block 31 , and one end of each arc guide plate 331 away from the partition plate 33 faces the outer wall of the corresponding rectangular frame 32 .

[0034] A certain gap is left between each arc guide plate 331 and the corresponding outer wall of the rectangular frame 32. When the liquid metal carries debris into the hollow block 31 through the gap between the arc guide plate 331 and the rectangular frame 32, since one end of each arc guide plate 331 away from the partition plate 33 is toward the corresponding outer wall of the rectangular frame 32, the flow of the incoming liquid metal and the discharged liquid metal can be prevented from affecting each other. In the process of liquid metal flow, the arc guide plate 331 can block the debris in the liquid metal, thereby reducing the loss of debris inside the hollow block 31, retaining the debris in the hollow block 31 to the greatest extent, and reducing the circulation of debris with the liquid metal.

[0035] See also Figure 4 As shown, the outer wall of the shaft core 1 is provided with a plurality of herringbone guide grooves 12 along the axial direction.

[0036] By providing a plurality of herringbone guide grooves 12, the liquid metal in the cavity 11 can be guided. The herringbone grooves push the liquid metal to move in the cavity 11, so that the liquid metal is concentrated in the middle section and refluxes along the isosceles trapezoidal annular grooves 22 to the two ends of the shaft core 1 (such as Figure 4 As shown by the arrow, it can not only make the liquid metal more evenly distributed, but also improve the fluidity of the liquid, improve the heat dissipation effect, and the flowing liquid metal can better contact with the partition plate 33, so as to intercept and collect the debris remaining in the liquid metal, thereby improving the stability of the bearing rotation.

[0037] See also Figure 4 As shown, the inner wall of the sleeve 2 is mirror-imaged with a plurality of right-angled trapezoidal annular grooves 24 , which are located on both sides of the isosceles trapezoidal annular groove 22 , and the inclined surface of each right-angled trapezoidal annular groove 24 faces the corresponding inclined surface of the isosceles trapezoidal annular groove 22 .

[0038] By providing a plurality of right-angled trapezoidal annular grooves 24, when there are a lot of debris, the metal debris can be pressed into the right-angled trapezoidal grooves by centrifugal force during the circulation of liquid metal, and due to the large tangential flow resistance in the right-angled trapezoidal annular grooves 24, the metal debris is prevented from continuing to move with the liquid metal flow. It does not enter the next liquid metal flow cycle, thereby gradually intercepting the debris, improving the interception efficiency, and preventing the metal debris from accumulating in the gap between the sleeve 2 and the shaft core 1, causing the bearing to get stuck.

[0039] See also Figure 7 As shown, arc-shaped guiding surfaces 332 are provided on both sides of one end of each partition plate 33 away from the hollow block 31 .

[0040] By providing an arc-shaped guide surface 332 at the end of the partition plate 33 , the liquid metal and debris entering the isosceles trapezoidal annular groove 22 can be guided so that they can flow along the curvature of the arc-shaped guide surface 332 , thereby increasing the flow speed of the liquid metal and ensuring that the debris can enter the hollow block 31 .

[0041] See also Figure 3 As shown, a first annular plate 211 is disposed at the edge of the sealing ring 21 , and a second annular plate 212 is disposed at one end of the first annular plate 211 away from the sealing plate, and the second annular plate 212 abuts against the outer wall of the shaft sleeve 2 .

[0042] By providing the first annular plate 211 and the second annular plate 212 , the liquid metal overflowing from between the sealing ring and the sleeve 2 can be blocked so as to remain in the space formed by the first annular plate 211 , the second annular plate 212 and the sleeve 2 .

[0043] See also Figure 3 As shown, an annular retaining groove 213 is provided on the inner wall of the sealing ring 21 .

[0044] By providing an annular retaining groove 213 on the inner wall of the sealing ring 21, the annular retaining groove 213 can block the liquid metal overflowing from between the sealing ring and the shaft core 1, further avoiding the overflow of the liquid metal and ensuring the overall stability of the bearing.

[0045] See also Figure 3 As shown, a heat dissipation hole 13 is provided at the center of the shaft core 1.

[0046] By providing the heat dissipation holes 13, the heat dissipation efficiency of the shaft core 1 can be further improved, thereby improving the stability of the bearing operation.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A liquid metal bearing for a CT tube, characterized in that: It includes a shaft core, a shaft sleeve and an interception mechanism; The shaft sleeve is coaxially rotatably arranged outside the shaft core, and the end of the shaft sleeve is slidably sealed with the shaft sleeve through a sealing ring; a cavity for storing liquid metal is formed between the shaft sleeve, the shaft core and the sealing ring; An isosceles trapezoidal annular groove is arranged at the center of the inner wall of the sleeve, and a plurality of rectangular through grooves are arranged equidistantly along the axis direction on the inner wall of the isosceles trapezoidal annular groove, and there are multiple groups of interception mechanisms, which are arranged in the corresponding rectangular through grooves and can intercept the debris as the sleeve rotates; Each set of interception mechanisms includes a hollow block, a rectangular frame and a partition plate; the hollow block is arranged in the corresponding rectangular through groove, and a strip groove connecting the interior of the hollow block is arranged at the center of one side of each hollow block close to the shaft core, and the rectangular frame is arranged in the corresponding strip groove, and a partition plate is arranged at the center of each rectangular frame.

2. The liquid metal bearing for a CT tube according to claim 1, characterized in that: Arc guide plates are arranged on both sides of one end of the partition plate close to the hollow block, and one end of each arc guide plate away from the partition plate faces the outer wall of the corresponding rectangular frame.

3. The liquid metal bearing for a CT tube according to claim 2, characterized in that: The outer wall of the shaft core is provided with a plurality of herringbone guide grooves along the axial direction.

4. The liquid metal bearing for a CT tube according to claim 3, characterized in that: The inner wall of the shaft sleeve is mirror-imaged with a plurality of right-angled trapezoidal ring grooves, which are located on both sides of the isosceles trapezoidal ring groove, and the inclined surface of each right-angled trapezoidal ring groove faces the corresponding inclined surface of the isosceles trapezoidal ring groove.

5. The liquid metal bearing for a CT tube according to claim 1, characterized in that: Arc-shaped guiding surfaces are arranged on both sides of one end of each partition plate away from the hollow block.

6. The liquid metal bearing for a CT tube according to claim 1, characterized in that: A first annular plate is arranged at the edge of the sealing ring, a second annular plate is arranged at one end of the first annular plate away from the sealing plate, and the second annular plate abuts against the outer wall of the shaft sleeve.

7. The liquid metal bearing for a CT tube according to claim 6, characterized in that: An annular retaining groove is arranged on the inner wall of the sealing ring.

8. The liquid metal bearing for a CT tube according to claim 1, characterized in that: A heat dissipation hole is arranged at the center of the shaft core.

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