Structure for preventing powder from falling off from rotating anode target disc and target disc
By designing grooves in the heat storage layer of the rotating anode target disk and coating it with a carbide coating, the problems of low heat dissipation efficiency and powder shedding are solved, achieving efficient heat dissipation and preventing powder drift, thus extending the service life of the CT tube.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIAMEN HONGLU TUNGSTEN MOLYBDENUM IND CO LTD
- Filing Date
- 2024-12-13
- Publication Date
- 2026-04-21
AI Technical Summary
Existing rotating anode target disks have low heat dissipation efficiency at high temperatures, and graphite powder is prone to detachment and enter the CT tube, affecting its service life.
Grooves are designed on the surface of the heat storage layer and coated with a refractory metal carbide coating to increase the heat dissipation area and isolate dust to prevent powder from scattering.
It significantly improves heat dissipation efficiency, reduces the number of times the X-ray tube sparks, and extends its service life.
Smart Images
Figure CN224140825U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of rotating anode target technology, and in particular to a structure and target for preventing powder shedding from a rotating anode target. Background Technology
[0002] CT (Computed Tomography) is a medical imaging technique that provides detailed cross-sectional images of the human body's internal structures. A CT scan uses an X-ray tube and detector that rotate around the patient to capture image data from different angles, which is then processed by a computer to generate detailed three-dimensional images. In CT technology, the rotating anode target disk is the source of X-rays in the CT tube and is one of the key components of the X-ray tube.
[0003] The rotating anode target disk is a typical sandwich structure. In the existing target disk structure design, a thin tungsten-rhenium alloy is set on the top as the track layer. Below the track layer, it is combined with a titanium-zirconium-molybdenum alloy (TZM molybdenum alloy) matrix layer. Graphite is welded to the back of the target surface layer as a heat storage layer.
[0004] During the operation of the rotating anode target disk, an ultra-high voltage (100kV) needs to be applied to the cathode to emit electrons, thus requiring a high vacuum and high cleanliness environment inside the X-ray tube. At the same time, the continuous bombardment of the electron beam by the target disk causes the overall temperature of the target disk to rise rapidly, thus requiring the target disk to have good heat dissipation capabilities.
[0005] The heat dissipation optimization design of the rotating anode target disk mainly adopts two methods: one is to use a multi-layer structure and add heat sinks, but this heat dissipation method is limited by space; the other is to improve the heat dissipation efficiency by changing the heat dissipation method, such as using liquid cooling or air cooling, but its heat dissipation effect is greatly affected by the external temperature and the heat dissipation efficiency is low.
[0006] Furthermore, due to its light weight and strong adsorption capacity, graphite will have a layer of graphite powder adsorbed on its surface after processing. This powder is usually removed through cleaning. However, graphite has poor dispersibility in water, and a small amount of graphite powder will remain on the target plate after cleaning. This graphite powder will then be installed into the CT tube along with the target plate. As the CT tube is used, the graphite powder will disperse inside the tube, leading to an increase in the number of arcing events, affecting the lifespan of the target plate, and in severe cases, causing the tube's glass shell to crack, rendering the entire CT tube unusable.
[0007] Therefore, how to develop a rotating anode target disk that can significantly improve heat dissipation efficiency while having a simple heat dissipation structure and not occupying too much space, and at the same time effectively prevent the heat storage layer from shedding powder and scattering inside the tube, is a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content
[0008] To address the shortcomings of the prior art mentioned in the background section, this utility model provides a structure for preventing powder shedding from a rotating anode target disk, the technical solution of which is as follows:
[0009] The structure for preventing powder shedding from a rotating anode target disk provided in this application includes a heat storage layer; the heat storage layer has an upper surface and a lower surface, and the heat storage layer is provided with a through hole extending from the upper surface to the lower surface, so that the outer peripheral surface of the heat storage layer forms an outer surface, and the inner wall surface of the through hole forms an inner surface; wherein, the through hole is coaxial with the heat storage layer; a groove is provided on one or more of the inner surface, outer surface, and lower surface of the heat storage layer; a metal coating is provided on the inner surface, outer surface, and lower surface of the heat storage layer, and the coating is formed on the surface of the groove.
[0010] In one embodiment, the coating is a refractory metal carbide coating.
[0011] In one embodiment, the coating is one or a combination of two of titanium carbide coating and molybdenum carbide coating.
[0012] In one embodiment, the thickness of the coating is 1-100 μm.
[0013] In one embodiment, the groove cross-section is one or more of trapezoidal, arc-shaped, or triangular; the grooves are distributed in a circular pattern with the axis of the heat storage layer as the center.
[0014] In one embodiment, the upper base of the trapezoid is 0.1-5mm long, the lower base of the trapezoid is 0.1-10mm long, the height of the trapezoid is 0.1-10mm, and the distance between the grooves is 0.1-10mm.
[0015] In one embodiment, the radius of curvature of the arc is 0.1-10 mm, the central angle of the arc is 10-180°, and the distance between the grooves is 0.1-10 mm.
[0016] In one embodiment, the base length of the triangle is 0.1-5mm, the height of the triangle is 0.1-5mm, the angle of the vertex angle of the triangle is 25-75°, and the distance between the grooves is 0.1-10mm.
[0017] In one embodiment, the lower surface of the heat storage layer is an annular inclined surface extending from the outer edge of the heat storage layer toward its center, and the height of the inner ring of the inclined surface is greater than the height of the outer ring of the inclined surface.
[0018] In one embodiment, the height of the slope is within 40% of the height of the thermal storage layer.
[0019] In one embodiment, the heat storage layer is made of graphite.
[0020] This application also provides a target disk, which includes a substrate layer, an upper surface of which is covered with a track layer, and the lower part of the substrate layer is connected to the upper surface of a heat storage layer. The heat storage layer is provided with the structure described above to prevent the rotating anode target disk from shedding powder.
[0021] In one embodiment, the substrate layer is made of a molybdenum alloy, and the orbital layer is made of a tungsten-rhenium alloy.
[0022] Compared with the prior art, the structure for preventing powder shedding from the rotating anode target disk provided by this utility model has the following beneficial effects:
[0023] This application increases the surface area of the rotating anode target disk by designing grooves, thereby increasing the heat dissipation area of the rotating anode target disk. It can significantly improve the heat dissipation efficiency while keeping the heat dissipation structure simple and not occupying too much space. At the same time, a coating design is adopted. The coating plays the role of isolating the heat storage layer dust during the use of the target disk, preventing dust from drifting into the PV tube, reducing the number of PV tube ignitions, improving the venting and aging efficiency of the target disk, and thus improving the service life of the product.
[0024] Other features and beneficial effects of this invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objectives and other beneficial effects of this invention can be realized and obtained through the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] Figure 1 A structural schematic diagram of Embodiment 1 provided by this utility model from the front view;
[0027] Figure 2 for Figure 1 AA cross-section view;
[0028] Figure 3 A structural schematic diagram of Embodiment 2 provided by this utility model from the front view;
[0029] Figure 4 for Figure 3 AA cross-section view;
[0030] Figure 5 A structural schematic diagram of Embodiment 3 provided by this utility model from the front view;
[0031] Figure 6 for Figure 5 AA cross-section view.
[0032] Figure label:
[0033] 100 Track layer, 200 Substrate layer, 300 Heat storage layer, 310 Groove, 320 Inner surface, 330 Outer surface, 340 Upper surface, 350 Lower surface, 360 Coating. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0035] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0036] This utility model provides, for example Figure 1-2 Example 1 Figure 3-4 Example 2 Figure 5-6 Example 3 illustrates a structure for preventing powder shedding from a rotating anode target disk:
[0037] The structure for preventing powder shedding from the rotating anode target disk includes a heat storage layer 300, which has an upper surface 340 and a lower surface 350. The heat storage layer 300 is provided with a through hole extending from the upper surface 340 to the lower surface 350, so that the outer peripheral surface of the heat storage layer 300 forms an outer surface 330 and an inner surface 320 is formed at the inner wall surface of the through hole.
[0038] The through hole is coaxial with the heat storage layer 300; a groove 310 is provided on one or more of the inner surface 320, outer surface 330 and lower surface 350 of the heat storage layer 300; a metal coating 360 is provided on the inner surface 320, outer surface 330 and lower surface 350 of the heat storage layer 300, and the coating 360 is formed on the surface of the groove 310.
[0039] Specifically, such as Figure 1-6 As shown, grooves 310 are provided on the inner surface 320, outer surface 330, and lower surface 350 of the heat storage layer 300. The grooves 310 design increases the surface area of the heat storage layer 300 of the rotating anode target disk, thereby increasing the heat dissipation area and improving the heat dissipation efficiency of the rotating anode target disk. Furthermore, the groove-type heat dissipation structure design is simple and does not occupy excessive space. In addition, the inner surface 320, outer surface 330, and lower surface 350 of the heat storage layer 300 are coated with a coating 360. During the use of the target disk, the coating 360 isolates dust from the heat storage layer 300, preventing dust from scattering inside the X-ray tube, reducing the number of X-ray tube firing cycles, improving the venting and aging efficiency of the target disk, and thus extending the product's service life.
[0040] The coating 360 is formed on the outer surface 330 of the heat storage layer 300. If it is not combined with the heat dissipation structure design, it will lead to poor heat dissipation to a certain extent. The heat storage layer 300 of this application is designed with the coating 360 and the heat dissipation structure of the surface groove 310 in combination, so that the anode target disk can both prevent powder shedding and improve heat dissipation efficiency.
[0041] Preferably, the coating 360 is a refractory metal carbide coating 360. Preferably, the coating 360 is one or a combination of two of titanium carbide coating 360 and molybdenum carbide coating 360.
[0042] Preferably, the thickness of the coating 360 is 1-100 μm.
[0043] Preferably, the through holes on the heat storage layer 300 make the upper surface 340 and the lower surface 350 of the heat storage layer 300 annular with equal inner diameters; specifically, the shape of the heat storage layer 300 is one of a cylinder, a frustum, or an inverted frustum with through holes. In this utility model, the shape and structure selection of the heat storage layer 300 includes, but is not limited to, the embodiment scheme.
[0044] Preferably, the cross-section of the groove 310 is one or more of a trapezoidal, arc-shaped, or triangular shape; with the axis of the heat storage layer 300 as the center, the groove 310 is distributed in a circular pattern.
[0045] By adopting the above technical solution, the surface area of the rotating anode target disk heat storage layer 300 can be further increased. With the axis of the heat storage layer 300 as the center, the grooves 310 are distributed in a circular pattern, which can make full use of the space on the surface of the heat storage layer 300, further expand the surface area, make the heat flow distribution uniform, and improve the heat dissipation efficiency.
[0046] It should be noted that the groove 310 can adopt the same shape and structure, for example, Figure 1-2 Example 1 Figure 3-4 Example 2 Figure 5-6 The scheme shown in Embodiment 3; the groove 310 can also be any combination of various shapes and structures; in this utility model, the shape and structure selection of the groove 310 includes, but is not limited to, the scheme of the embodiment.
[0047] It should also be noted that, in addition to the preferred arrangement of the grooves 310 in a circular pattern around the axis of the heat storage layer 300 (e.g., in embodiments 1-3), they can also be arranged in any dispersed manner, including but not limited to the embodiments.
[0048] Preferred, such as Figure 1-2 As shown in Embodiment 1, the length of the upper base of the trapezoid is 0.1-5mm, the length of the lower base of the trapezoid is 0.1-10mm, the height of the trapezoid is 0.1-10mm, and the distance between the grooves 310 is 0.1-10mm.
[0049] More preferably, the trapezoidal groove 310 gradually increases in width along the direction close to its inner surface 320, its outer surface 330, or its lower surface 350. That is, the lower base of the trapezoid is oriented towards the inner surface 320, the outer surface 330, or the lower surface 350; the angle between the base and the waist of the trapezoid is less than 90°.
[0050] This design allows the opening of the groove 310 to face outwards, which is more conducive to heat dissipation.
[0051] Preferred, such as Figure 3-4 As shown in Embodiment 2, the radius of curvature of the arc is 0.1-10mm, the central angle of the arc is 10-180°, and the distance between the grooves 310 is 0.1-10mm.
[0052] Preferred, such as Figure 5-6 As shown in Embodiment 3, the base length of the triangle is 0.1-5mm, the height of the triangle is 0.1-5mm, the angle of the vertex angle of the triangle is 25-75°, and the distance between the grooves 310 is 0.1-10mm.
[0053] By adopting the above technical solution, and by controlling the specific dimensions of the trapezoid, arc and triangle shapes, as well as the distance between the grooves 3103, the stability and mechanical strength of the groove 310 structure can be guaranteed, and the surface area of the heat storage layer 300 can be further increased to improve the heat dissipation efficiency.
[0054] Preferred, such as Figure 1-6 As shown, the lower surface 350 of the heat storage layer 300 is an annular inclined surface extending from its outer edge to its center, and the height of the inner ring of the inclined surface is greater than the height of the outer ring of the inclined surface.
[0055] Preferably, the height of the inclined surface is within 40% of the height of the heat storage layer 300.
[0056] By adopting the above technical solution, by setting the lower surface 350 of the heat storage layer 300 as an inclined surface, the surface area of the heat storage layer 300 can be further increased, the heat dissipation area can be increased, and the heat dissipation efficiency can be improved. By controlling the height of the inclined surface to be within 40% of the height of the heat storage layer 300, the stability of the structure of the heat storage layer 300 can be ensured, while the heat dissipation area can be increased.
[0057] It should be noted that, from bottom to top, the distance from the inner ring to the substrate layer 200 and the distance from the outer ring to the substrate layer 200 are respectively the heights of the inner ring and the outer ring. The height of the inclined plane is the height difference between the inner ring and the outer ring.
[0058] The terms "inner surface 320", "outer surface 330", "inner ring", "outer ring", "inner diameter", and "outer diameter" used in this article refer to directions closer to the axis of the thermal storage layer 300 as "inner" and directions further away from the axis of the thermal storage layer 300 as "outer". Therefore, "the height of the inner ring of the inclined plane is greater than the height of the outer ring of the inclined plane" means that the height of the inclined plane gradually decreases along the direction from the center of the thermal storage layer 300 to the outer edge of the thermal storage layer 300.
[0059] Preferably, the heat storage layer 300 is made of graphite. Utilizing graphite's high emissivity and rapid heat dissipation, it helps to quickly dissipate the heat generated by the anode target disk during operation.
[0060] This utility model also provides a target plate:
[0061] The target disk includes a substrate layer 200, the upper surface 340 of which is covered by a track layer 100, and the lower part of the substrate layer 200 is connected to the upper surface 340 of the heat storage layer 300. The heat storage layer 300 is a structure as described above to prevent powder shedding from the rotating anode target disk.
[0062] like Figure 1-6As shown, a track layer 100 is covered on the upper surface 340 of the substrate layer 200. The substrate layer 200 is connected to the upper surface 340 of the heat storage layer 300 below. The heat storage layer 300 is a hollow cylinder and includes an inner surface 320, an outer surface 330, an upper surface 340, and a lower surface 350. A groove 310 is provided on one or more surfaces of the inner surface 320, outer surface 330, or lower surface 350 of the hollow cylinder.
[0063] Preferably, the substrate layer 200 is made of molybdenum alloy, and the track layer 100 is made of tungsten-rhenium alloy.
[0064] More preferably, the substrate layer 200 is made of TZM molybdenum alloy. The orbital layer 100 is made of tungsten-rhenium alloy as the target surface material. Molybdenum alloy has a lower density than tungsten-rhenium alloy, but a higher specific heat capacity. Therefore, using molybdenum alloy as the substrate layer 200 can improve the heat capacity of the target disk.
[0065] Test on the effect of preventing powder shedding:
[0066] A metal is solidified onto the surface of the thermal storage layer through a specific processing method, forming a metal carbide coating on the surface of the thermal storage layer. This application also provides an operational experimental example and verification experiment comparison of depositing a refractory metal carbide coating on the surface of a graphite thermal storage layer using refractory metals, as follows:
[0067] 1. Experimental Example 1
[0068] (1) Experimental Example 1: The graphite heat storage layer to be coated and pure molybdenum powder with a Fisher particle size of 3-6 μm were placed in a high-vacuum high-temperature furnace with a tungsten wire mesh heating element at 1700-2000℃ and a vacuum degree of less than 5×10 -3 The graphite thermal storage layer with a molybdenum carbide coating deposited on its surface is obtained by processing under a Pa environment for 30-60 minutes. The thickness of the deposited molybdenum carbide coating is 1-100 μm.
[0069] (2) Experimental example with coating: 1. Comparison of experimental design without coating:
[0070] After the untreated graphite heat storage layer was fabricated and assembled into a spherical tube, it was ignited a total of 108 times during the exhaust and aging test cycles.
[0071] In Experiment Example 1, after the graphite heat storage layer with coating was fabricated and assembled into a ball tube, exhaust and aging tests were conducted. The total number of sparks in the test cycle was 41. It can be seen that the deposited coating in Experiment Example 1 can effectively reduce the number of sparks during the exhaust and aging stages after the target plate is assembled into a ball tube.
[0072] 2. Experimental Example 2
[0073] (1) Experimental Example 2: Place the graphite heat storage layer to be coated and the pure titanium sheet with a thickness of 0.1-0.3 mm in a high-vacuum high-temperature furnace with a tungsten wire mesh heating element at 1400-1600℃ and a vacuum degree of less than 5×10 -3 The graphite heat storage layer with a titanium carbide coating deposited on its surface is obtained by processing under a Pa environment for 30-60 minutes. The thickness of the deposited molybdenum carbide coating is 1-100 μm.
[0074] (2) Experimental example 2 with coating deposited, and comparative experiment without coating:
[0075] After the untreated graphite heat storage layer was fabricated and assembled into a spherical tube, it was ignited a total of 108 times during the exhaust and aging test cycles.
[0076] In Experiment Example 2, after the graphite heat storage layer with coating was fabricated and assembled into a ball tube, exhaust and aging tests were conducted. The total number of sparks in the test cycle was 37. It can be seen that the deposited coating in Experiment Example 2 can effectively reduce the number of sparks during the exhaust and aging stages after the target plate is assembled into a ball tube.
[0077] Although this document frequently uses terms such as orbital layer, substrate layer, heat storage layer, and groove, the possibility of using other terms is not excluded. These terms are used merely for the convenience of describing and explaining the essence of this invention; interpreting them as any additional limitation would contradict the spirit of this invention.
[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.
Claims
1. A structure for preventing the release of powder from a rotating anode target disk, characterized by: Including thermal storage layers; The heat storage layer has an upper surface and a lower surface, and the heat storage layer is provided with a through hole extending from the upper surface to the lower surface, so that the outer peripheral surface of the heat storage layer forms an outer surface, and the inner surface is formed at the inner wall surface of the through hole; The through hole is coaxial with the heat storage layer; a groove is provided on one or more of the inner surface, outer surface and lower surface of the heat storage layer; a metal coating is provided on the inner surface, outer surface and lower surface of the heat storage layer, and the coating is formed on the surface of the groove.
2. The structure for preventing the powder scattering of a rotary anode target disk according to claim 1, characterized by: The coating is a refractory metal carbide coating.
3. The structure for preventing the powder scattering of a rotary anode target disk according to claim 1, characterized by: The coating is one or a combination of two of titanium carbide coating and molybdenum carbide coating, and the thickness of the coating is 1-100 μm.
4. The structure for preventing the powder scattering of a rotary anode target disk according to claim 1, characterized by: The cross-section of the groove is one or more of trapezoidal, arc-shaped, or triangular. The grooves are distributed in a circular pattern with the axis of the heat storage layer as the center.
5. The structure for preventing the powder scattering of a rotary anode target disk according to claim 4, characterized by: The upper base of the trapezoid has a length of 0.1-5mm, the lower base has a length of 0.1-10mm, the height of the trapezoid is 0.1-10mm, and the distance between the grooves is 0.1-10mm. And / or, the radius of curvature of the arc is 0.1-10mm, the central angle of the arc is 10-180°, and the distance between the grooves is 0.1-10mm; And / or, the base length of the triangle is 0.1-5mm, the height of the triangle is 0.1-5mm, the angle of the vertex angle of the triangle is 25-75°, and the distance between the grooves is 0.1-10mm.
6. The structure for preventing the powder scattering of a rotary anode target disk according to claim 1, characterized by: The lower surface of the thermal storage layer is an annular inclined plane extending from the outer edge of the thermal storage layer toward its center, and the height of the inner ring of the inclined plane is greater than the height of the outer ring of the inclined plane.
7. The structure for preventing the powder scattering of a rotary anode target disk according to claim 6, characterized by: The height of the inclined plane is within 40% of the height of the thermal storage layer.
8. The structure for preventing the powder scattering of a rotary anode target disk according to claim 1, characterized by: The heat storage layer is made of graphite.
9. A target disk characterized by: It includes a substrate layer, the upper surface of which is covered with a track layer, and the lower part of the substrate layer is connected to the upper surface of the heat storage layer. The heat storage layer is provided with a structure as described in any one of claims 1-8 to prevent powder shedding from the rotating anode target disk.
10. The target disk of claim 9, wherein: The substrate layer is made of molybdenum alloy, and the orbital layer is made of tungsten-rhenium alloy.