Split anode target disk, anode assembly, and x-ray tube

Abstract

A split type anode target disc, an anode assembly and an X-ray tube are disclosed. The anode target disc comprises a main body provided with a plurality of mounting slots arranged along the circumference of the main body; a plurality of target disc pieces corresponding to the mounting slots, each target disc piece comprising a plug-in part which is detachably inserted into the corresponding mounting slot, and the plurality of target disc pieces located in the corresponding mounting slots are spliced to form the bombarded surface of the anode target disc; and a locking member detachably connected with the main body, the locking member being used to lock the plurality of target disc pieces in the corresponding mounting slots. The technical solution of the present application can effectively prolong the service life of the anode target disc, the anode assembly and the X-ray tube.

Description

Technical Field

[0001] This utility model relates to the field of X-ray tube technology, and in particular to a split-type anode target disk, anode assembly, and X-ray tube. Background Technology

[0002] X-ray tubes are widely used in medical imaging diagnostic equipment, especially CT (Computed Tomography) and DSA (Digital Subtraction Angiography) equipment. An X-ray tube consists of a tube shell and cathode and anode assemblies housed within the shell. During operation, the cathode emits an electron beam that bombards an anode target disk on the anode assembly to generate X-rays. The anode target disk is connected to a rotor and driven by the rotor to rotate at high speed, causing the bombardment position of the electron beam on the target disk surface to continuously change, thus preventing localized overheating of the target disk.

[0003] However, the anode target disk is continuously bombarded by high-energy electron beams during operation. The temperature at the bombarded areas rises sharply, while the temperature in unbombarded areas remains relatively low, creating a significant temperature gradient on the target disk surface. This temperature gradient generates substantial thermal stress within the target disk, and the monolithic structure cannot effectively release this stress. Over time, this stress accumulates, easily leading to failure modes such as melting pits and cracks on the target disk surface, severely impacting the lifespan of the X-ray tube. How to effectively release the thermal stress of the target disk to suppress surface failure while ensuring the structural reliability of the anode target disk is a problem that urgently needs to be solved by existing technologies. Utility Model Content

[0004] The technical problem solved by this utility model is to provide an improved split-type anode target disk, anode assembly, and X-ray tube.

[0005] To solve the above-mentioned technical problems, this utility model provides a split-type anode target disk, comprising: a main body having a plurality of mounting slots arranged at intervals along the circumference of the main body; a plurality of target disk pieces corresponding one-to-one with the plurality of mounting slots, each target disk piece including an insertion part detachably inserted into the corresponding mounting slot, the plurality of target disk pieces located in the corresponding mounting slots being spliced ​​to form the bombarded surface of the anode target disk; and a locking member detachably connected to the main body, the locking member being used to lock the plurality of target disk pieces in the corresponding mounting slots.

[0006] Optionally, each of the mounting slots includes a slot bottom and a slot opening, wherein the slot opening opens radially outward along the body portion, and at least a portion of the projection of the slot bottom extends beyond the area of ​​the slot opening along the radial direction of the body portion.

[0007] Optionally, the cross-sectional shape of the portion of the plug-in part located within the mounting groove is adapted to the cross-sectional shape of the mounting groove.

[0008] Optionally, the cross-sectional shape of the mounting groove is T-shaped or trapezoidal.

[0009] Optionally, each of the mounting slots extends through the opposite two end faces of the main body along the axial direction of the main body, and the locking member includes a first locking part and a second locking part, which are detachably connected to the two end faces of the main body along the axial direction, respectively, to close the openings on both sides of the mounting slot.

[0010] Optionally, the mounting groove has an open end and a closed end along the axial direction of the main body, the insertion part is inserted into the corresponding mounting groove through the open end, and the locking member is detachably connected to the main body and closes the open end.

[0011] Optionally, for any two adjacent target discs among the plurality of target discs, the preceding target disc has a protrusion extending toward the following target disc, and the following target disc has a receiving portion for receiving the protrusion.

[0012] Optionally, the protrusion and the receiving part are located on the other side of the target disk used to assemble the bombarded surface.

[0013] Optionally, the multiple target discs may have the same shape.

[0014] Optionally, along the axial direction of the main body, the thickness of the protrusion does not exceed one-third of the total thickness of the target disc.

[0015] Optionally, along the axial direction of the main body, at least one end face of the protrusion is in contact with the inner wall of the receiving part.

[0016] Optionally, the main body is generally in the shape of a regular polygon, and the outer edge of the projection of the main body along the axial direction includes multiple straight edges. The multiple straight edges are connected end to end along the circumference of the main body, and each mounting groove is opened at the middle position of the corresponding straight edge.

[0017] Optionally, each target disc further includes a bombarded portion connected to one end of the insertion portion radially away from the mounting groove. The side surface of the bombarded portion near the main body is adapted to the shape of the straight edge. The bombarded portions of the multiple target discs installed in place are spliced ​​together circumferentially to form a complete bombarded surface.

[0018] Optionally, a gap is provided between two adjacent target discs along the circumference of the main body.

[0019] Optionally, the target disc is made of tungsten, molybdenum, or a tungsten-molybdenum alloy.

[0020] Optionally, the number of target discs is 4 to 12.

[0021] To address the aforementioned technical problems, this application also provides an anode assembly, comprising: the aforementioned anode target disk; and a rotor for driving the anode target disk to rotate.

[0022] Optionally, it also includes: a central shaft portion that passes through the anode target disk; a bushing portion that is sleeved on the central shaft portion, wherein the anode target disk and the rotor are respectively fixedly connected to both ends of the bushing portion, and the rotor drives the anode target disk to rotate about the central shaft portion through the bushing portion.

[0023] Optionally, the bushing includes a connecting section along the axial direction, the anode target disk is sleeved on the connecting section, at least a portion of the connecting section extends out of the anode target disk, and the locking member is connected to the connecting section.

[0024] Optionally, there is a non-zero gap between the outer peripheral surface of the central shaft portion and the inner wall of the bushing portion, the gap forming a filling cavity, the filling cavity being filled with liquid metal, and the central shaft portion, the bushing portion, and the liquid metal in the filling cavity cooperating to form a liquid metal bearing.

[0025] Optionally, sealing flanges are provided at both ends of the bushing portion along the axial direction, and the sealing flanges are sleeved on the central shaft portion and close the openings of the filling cavity on both sides along the axial direction.

[0026] To address the aforementioned technical problems, this application also provides an X-ray tube, including the aforementioned anode assembly.

[0027] Compared with the prior art, the technical solution of this utility model embodiment has the following beneficial effects: The technical solution of this application employs a split-type structure for the anode target disk. The target disk pieces are detachably inserted into the mounting slots of the main body via a connector and locked in place by a locking component. When individual target disk pieces fail due to electron beam bombardment resulting in melting pits or cracks, the failed target disk piece can be removed and replaced individually without replacing the entire anode target disk, significantly reducing maintenance costs. Furthermore, the split-type structure naturally creates separation between the target disk pieces, meaning there are certain gaps between adjacent target disk pieces, which provides conditions for thermal expansion and thermal stress release compared to traditional integral target disks.

[0028] Furthermore, the projection of the bottom of the groove extends at least partially beyond the groove opening area, meaning the mounting groove has a cross-sectional shape that is wider at the bottom and narrower at the opening. After the insertion part is inserted, the portion of the groove bottom that is wider than the groove opening forms a radial engagement with the insertion part, effectively preventing the target plate from radially dislodging from the mounting groove under centrifugal force when the anode target plate rotates at high speed, thus improving the locking reliability.

[0029] Furthermore, the cross-sectional shape of the plug part is adapted to the cross-section of the mounting groove, so that the two fit tightly, reducing assembly gaps and loosening during operation; the T-shaped or trapezoidal cross-section utilizes the geometric characteristics of a wide bottom and narrow opening, and the plug part is radially limited after being inserted axially, which can prevent the target plate from flying out radially without additional fasteners, simplifying the structure.

[0030] Furthermore, the mounting groove extends axially through both ends of the main body, allowing the insertion part to be directly inserted from the end, simplifying the assembly process. The first and second locking parts respectively close the openings on both sides, restricting the movement of the insertion part from both axial ends. The double-end locking provides uniform force, improving structural stability under high-speed rotation.

[0031] Furthermore, the mounting groove has an open end and a closed end. The closed end provides an axial positioning stop for the insertion part. The insertion part is inserted from the open end to the closed end and is in place, with clear positioning. Thus, only one locking element is needed to close the open end to complete the fixation, reducing the number of locking elements and simplifying the assembly steps.

[0032] Furthermore, adjacent target discs are interlocked circumferentially through the cooperation of the protrusions and the receiving part, which prevents relative misalignment of adjacent target discs in the circumferential direction, ensures the flatness and continuity of the bombarded surface formed by splicing, and avoids steps at the joints of adjacent target discs that would affect the quality of X-ray generation.

[0033] Furthermore, the protrusion and the receiving part are located on the other side of the bombarded surface, so they do not affect the flatness of the bombarded surface.

[0034] Furthermore, the consistent shape of multiple target discs facilitates mass production and reduces mold costs.

[0035] Furthermore, the thickness of the protrusion should not exceed one-third of the total thickness of the target disc to ensure the structural strength of the main body of the target disc and avoid the protrusion being too thick, which would result in a weak cross section.

[0036] Furthermore, the end face of the protrusion fits into the inner wall of the receiving part, increasing the contact area, improving interlocking stability, and enhancing heat conduction between adjacent target discs.

[0037] Furthermore, the main body is a regular polygon, with each mounting slot located in the middle of its corresponding straight edge. The geometric conditions of the straight edges containing each mounting slot are completely consistent, ensuring uniform mounting angles and stress states for the target discs, thus simplifying machining and assembly. The straight edges provide a flat machining reference surface for the mounting slots, facilitating precise slot creation.

[0038] Furthermore, gaps exist between adjacent target discs, providing space for thermal expansion, effectively releasing thermal stress, and suppressing crack formation caused by temperature gradients. Attached Figure Description

[0039] Figure 1 This is an exploded view of an anode assembly according to an embodiment of this application; Figure 2 yes Figure 1 A schematic diagram of the target plate; Figure 3 yes Figure 1 A schematic diagram showing the fit between the main body and the target plate; Figure 4 yes Figure 1 A sectional view of the structure in its assembled state; Figure 5 yes Figure 4 A schematic diagram showing the fit between the central sleeve, the central shaft, and the main body. Figure 6 yes Figure 5 A magnified view of a portion of region A in the middle. Detailed Implementation

[0040] As mentioned in the background section, existing anode target disks generate a large temperature gradient due to electron beam bombardment during operation. The integral target disk structure cannot effectively release thermal stress, which easily leads to failure modes such as melting pits and cracks on the target disk surface, severely reducing the service life of the X-ray tube.

[0041] To address the aforementioned technical problems, this utility model provides a split-type anode target disk, anode assembly, and X-ray tube. The anode target disk includes: a main body with multiple mounting slots spaced circumferentially along the main body; multiple target disk pieces corresponding one-to-one with the mounting slots, each target disk piece including an insertion portion detachably inserted into its corresponding mounting slot; the multiple target disk pieces located in their respective mounting slots being joined to form the bombarded surface of the anode target disk; and a locking member detachably connected to the main body, used to lock the multiple target disk pieces within their corresponding mounting slots.

[0042] The technical solution of this application employs a split structure for the anode target disk. The target disk pieces are detachably inserted into the mounting slots of the main body via a connector and locked in place by a locking mechanism. When a target disk piece fails due to electron beam bombardment resulting in a melting pit or crack, the failed target disk piece can be removed and replaced individually without replacing the entire anode target disk, significantly reducing maintenance costs. Simultaneously, the split structure naturally creates separation between the target disk pieces, providing conditions for thermal expansion and thermal stress release compared to a monolithic target disk.

[0043] To make the above-mentioned objectives, features and beneficial effects of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0044] Figure 1 This is an exploded view of an anode assembly 100 according to an embodiment of this application. Figure 2 yes Figure 1A schematic diagram of the target disk 2. Figure 3 yes Figure 1 A schematic diagram showing the assembly of the main body 1 and the target plate 2. Figure 4 yes Figure 1 The diagram shows a sectional view of the structure in its assembled state.

[0045] Combination Figures 1 to 4 In some embodiments, the anode target disk 10 may include: a main body 1 having a plurality of mounting slots 11 arranged at intervals along the circumference of the main body 1; a plurality of target disk pieces 2, each of the plurality of target disk pieces 2 corresponding to one of the plurality of mounting slots 11, each of the target disk pieces 2 including a plug-in part 21, the plug-in part 21 being detachably inserted into the corresponding mounting slot 11, the plurality of target disk pieces 2 located in the corresponding mounting slots 11 being spliced ​​to form the bombarded surface P of the anode target disk 10; and a locking member 3 detachably connected to the main body 1, the locking member 3 being used to lock the plurality of target disk pieces 2 in the corresponding mounting slots 11.

[0046] Specifically, the main body 1 is located in the central region of the anode target disk 10. Furthermore, the main body 1 can be generally disk-shaped. Furthermore, the outer peripheral region of the main body 1 is used to mount the target disk plate 2.

[0047] In some embodiments, the main body 1 may be made of a metallic material with sufficient strength and heat resistance, such as stainless steel or a high-temperature alloy.

[0048] Furthermore, mounting grooves 11 are formed in the outer peripheral region of the main body 1, and multiple mounting grooves 11 are arranged at uniform intervals along the circumference of the main body 1. The mounting grooves 11 are used to accommodate and constrain the corresponding target discs 2, and the extending direction of the mounting grooves 11 is parallel to the axial direction of the main body 1.

[0049] Furthermore, the target disk 2 is used to withstand electron beam bombardment and generate X-rays. Each target disk 2 corresponds to a mounting slot 11, and each target disk 2 is independently mounted in its corresponding mounting slot 11.

[0050] Furthermore, the insertion part 21 is provided on the target plate 2 for insertion and engagement with the mounting slot 11.

[0051] Furthermore, after each target disk 2 is positioned in its corresponding mounting slot 11 and installed in place, the multiple target disks 2 are sequentially adjacent to each other along the circumference of the main body 1, and the outer surfaces of each target disk 2 are joined together to form the bombarded surface P of the anode target disk 10. The bombarded surface P is used to withstand the bombardment of the electron beam emitted by the cathode, and the bombarded surface P is generally a continuous annular surface.

[0052] Furthermore, the locking member 3 is detachably connected to the main body 1. The locking member 3 can be used to lock each target disc 2 after it is inserted into the mounting groove 11 in the mounting groove 11, preventing the target disc 2 from coming out axially or radially when the anode target disc 10 rotates at high speed.

[0053] In some embodiments, the disassembly direction of the locking member 3 is associated with the rotation direction of the anode target disk 10.

[0054] Specifically, the locking element 3 can be, for example, a fastening nut, and the tightening direction of the fastening nut can be consistent with the rotation direction of the anode target disk 10, so as to prevent the locking element 3 from moving in the loosening direction due to inertia during the start-stop phase.

[0055] When it is necessary to replace a target disc 2, first release the locking state of the locking member 3, and then the target disc 2 can be taken out from the mounting slot 11.

[0056] In some embodiments, the locking element 3 may be, for example, a locking nut.

[0057] In a variation, the locking element 3 can also be connected to the main body 1 by means of snap-fit ​​connection, interference fit, or other methods.

[0058] Therefore, by designing the target plate 2 and the main body 1 as a separate and detachable structure, the anode target disk 10 enables independent installation and replacement of each target plate 2. When electron beam bombardment causes a melting pit or crack in a target plate 2, only the failed target plate 2 needs to be replaced, without replacing the entire anode target disk 10, significantly reducing maintenance costs. At the same time, the separate structure provides space for the target plate 2 to expand under thermal conditions, which is beneficial for the release of thermal stress and suppresses crack propagation caused by temperature gradients.

[0059] In some embodiments, each of the mounting slots 11 includes a slot bottom 111 and a slot opening 112, wherein the slot opening 112 opens outward along the radial direction of the main body portion 1, and at least a portion of the projection of the slot bottom 111 extends beyond the area of ​​the slot opening 112 along the radial direction of the main body portion 1.

[0060] Specifically, the slot 112 is an opening of the mounting slot 11 on the outer peripheral surface of the main body 1. The slot 112 opens radially outward along the main body 1, that is, the connection between the mounting slot 11 and the external space of the main body 1 faces radially outward.

[0061] Furthermore, the groove bottom 111 is the innermost part of the mounting groove 11 along the radial direction. In a cross-section perpendicular to the axial direction, along the radial direction of the main body 1, the circumferential width of the groove bottom 111 is greater than the circumferential width of the groove opening 112, that is, at least a portion of the projection of the groove bottom 111 extends circumferentially beyond the area of ​​the groove opening 112. In other words, the mounting groove 11 has a shape that is wider at the bottom and narrower at the opening in a cross-section perpendicular to the axial direction.

[0062] Therefore, when the plug part 21 is inserted into the mounting groove 11, since the bottom of the groove 111 is wider than the opening of the groove 112, when the anode target plate 10 rotates at high speed and generates centrifugal force, the bottom-wide and opening-narrow structure of the mounting groove 11 can effectively prevent the target plate 2 from coming out of the mounting groove 11 radially, thus improving the locking reliability of the target plate 2 under high-speed rotation conditions.

[0063] refer to Figure 3 In some embodiments, the cross-sectional shape of the portion of the plug 21 located within the mounting groove 11 is adapted to the cross-sectional shape of the mounting groove 11.

[0064] Specifically, in a cross section perpendicular to the axial direction, the outer contour of the portion of the plug-in portion 21 located inside the mounting groove 11 matches the inner contour shape of the mounting groove 11.

[0065] In some embodiments, the cross-sectional shape of the mounting groove 11 is T-shaped or trapezoidal.

[0066] For example, when the cross-sectional shape of the mounting groove 11 is T-shaped, the cross-sectional shape of the portion of the insertion part 21 located inside the mounting groove 11 is also T-shaped. Therefore, the insertion part 21 can fit tightly against the inner wall of the mounting groove 11, reducing the assembly gap and preventing the target plate 2 from becoming loose or wobbling within the mounting groove 11 when the anode target plate 10 rotates at high speed, thereby ensuring the structural stability and rotational accuracy of the anode target plate 10.

[0067] Furthermore, the T-shaped or trapezoidal cross-sectional shape has a geometric feature of being wide at the bottom and narrow at the opening, which enables radial positioning of the insertion part 21 without the aid of additional fasteners.

[0068] In one specific embodiment, the mounting groove 11 has a T-shaped cross-section, with the bottom 111 being the horizontal beam portion of the T-shape and the opening 112 being the vertical beam portion of the T-shape.

[0069] In another specific embodiment, the cross-sectional shape of the mounting groove 11 is trapezoidal, with the long base of the trapezoid located on the radially inner side to form the groove bottom 111, and the short base of the trapezoid located on the radially outer side to form the groove opening 112.

[0070] Therefore, after the insertion part 21 is inserted into the mounting groove 11 along the axial direction, the structure of the groove bottom 111 being wider than the groove opening 112 forms a radial constraint on the insertion part 21, preventing the target plate 2 from flying out radially and simplifying the overall structure.

[0071] In some embodiments, each of the mounting grooves 11 can extend through the opposite two end faces of the main body 1 along the axial direction, and the locking member 3 includes a first locking part and a second locking part, which are detachably connected to the two end faces of the main body 1 along the axial direction, respectively, to close the openings on both sides of the mounting groove 11.

[0072] Specifically, the mounting groove 11 completely penetrates the two axial end faces of the main body 1 along the axial direction, that is, the mounting groove 11 forms openings on the two end faces of the main body 1 respectively. The insertion part 21 can be inserted into the mounting groove 11 from the opening on either end face of the main body 1 along the axial direction, making the assembly path direct and the operation simple.

[0073] Furthermore, the locking member 3 includes a first locking part and a second locking part. The first locking part is detachably connected to a first end face of the main body 1 along the axial direction, and the second locking part is detachably connected to a second end face of the main body 1 along the axial direction. The first locking part and the second locking part respectively close the openings of the mounting groove 11 on the two end faces of the main body 1, thereby restricting the axial movement of the insertion part 21 within the mounting groove 11 from both axial ends.

[0074] Therefore, by locking the first and second locking parts at both ends in the axial direction, the axial constraint force on the plug part 21 in the mounting groove 11 is evenly distributed, and there will be no one-sided load, which is beneficial to maintaining the structural stability and reliability of the anode target disk 10 under high-speed rotation conditions.

[0075] In some embodiments, reference Figure 3 The mounting groove 11 has an open end 113 and a closed end 114 along the axial direction of the main body 1. The insertion part 21 is inserted into the corresponding mounting groove 11 through the open end 113. The locking member 3 is detachably connected to the main body 1 and closes the open end 113.

[0076] Specifically, the open end 113 is the opening of the mounting groove 11 on one of the axial end faces of the main body 1, and the closed end 114 is the closed bottom of the mounting groove 11 on the other axial end face of the main body 1. That is, the mounting groove 11 is open at only one end along the axial direction, and closed at the other end. During assembly, the insertion part 21 is inserted into the mounting groove 11 axially from the open end 113 until the end of the insertion part 21 reaches the closed end 114. The closed end 114 forms a stop for the insertion part 21 to be inserted axially, so that the insertion part 21 can quickly and accurately reach the installation position.

[0077] Furthermore, the locking member 3 is detachably connected to the end face of the main body 1 having an open end 113. The locking member 3 closes the open end 113, thereby restricting the insertion part 21 from exiting the mounting groove 11 from the open end 113.

[0078] Therefore, the single-sided opening mounting groove 11 only requires one locking element 3 to complete the axial locking of all target discs 2, reducing the number of locking elements and simplifying the assembly steps and overall structure of the anode target disc 10. At the same time, the closed end 114 constitutes a reliable positioning reference for the insertion part 21, ensuring that the axial installation positions of each target disc 2 are consistent.

[0079] In some embodiments, combined with Figures 1 to 3 For any two adjacent target discs 2 among the plurality of target discs 2, the preceding target disc 2 has a protrusion 22 extending toward the following target disc 2, and the following target disc 2 has a receiving portion 23 for receiving the protrusion 22.

[0080] Specifically, the protrusion 22 is a circumferentially extending protruding structure on the target disc 2. In two adjacent target discs 2, the protrusion 22 of the preceding target disc 2 extends toward the following target disc 2, and the following target disc 2 is provided with a corresponding receiving part 23. The receiving part 23 can be a recessed structure used to accommodate the protrusion 22 of the preceding target disc 2.

[0081] During assembly, each target disc 2 is installed sequentially, with the protrusion 22 of the previous target disc 2 embedded in the receiving part 23 of the next target disc 2. Adjacent target discs 2 achieve circumferential interlocking through the interlocking of the protrusion 22 and the receiving part 23.

[0082] Thus, through the interlocking of the protrusions 22 and the receiving part 23 between adjacent target disks 2, each target disk 2 is mutually constrained in the circumferential direction, preventing relative misalignment of adjacent target disks 2 in the circumferential direction when the anode target disk 10 rotates, and ensuring the flatness and continuity of the bombarded surface P formed by splicing. The joints between adjacent target disks 2 maintain a smooth transition, avoiding interference with the electron beam bombardment position due to steps at the joints, thereby ensuring the quality of X-ray generation.

[0083] In some embodiments, the protrusion 22 and the receiving portion 23 are located on the other side of the target disk 2 used to splice together the bombarded surface P.

[0084] Specifically, the target disk 2 has two opposing sides, with the outer surface of one side participating in the splicing to form the bombarded surface P, and this side facing the source direction of the electron beam; the protrusion 22 and the receiving part 23 are disposed on the other side of the target disk 2, that is, the side away from the bombarded surface P, and this side faces the main body 1. Thus, the interlocking structure of the protrusion 22 and the receiving part 23 is located on the back side of the bombarded surface P, which does not affect the flatness and integrity of the bombarded surface P, ensuring that the electron beam bombardment effect is not interfered with.

[0085] In some embodiments, the plurality of target discs 2 have the same shape.

[0086] Specifically, each target disc 2 has an identical external structure, including the shape of the insertion part 21, the position and size of the protrusion 22, the position and size of the receiving part 23, and the shape of the portion that participates in forming the bombarded surface P. Therefore, multiple target discs 2 can be mass-produced using the same mold, significantly reducing mold costs and processing difficulty, and improving production efficiency and product consistency. At the same time, the identical shape also allows for interchangeable installation of the target discs 2, facilitating spare parts management and on-site replacement.

[0087] In some embodiments, along the axial direction of the main body 1, the thickness of the protrusion 22 does not exceed one-third of the total thickness of the target disc 2.

[0088] By controlling the thickness ratio of the protrusion 22, it can be ensured that the target disk 2 still has sufficient main structural strength after the receiving part 23 is opened or the protrusion 22 is set, and the connection area of ​​the target disk 2 is prevented from forming a weak cross section due to the excessive thickness of the protrusion 22.

[0089] In one specific embodiment, the thickness of the protrusion 22 may be, for example, one-quarter of the total thickness of the target disc 2.

[0090] In some embodiments, along the axial direction of the main body portion 1, at least one end face of the protrusion 22 is in contact with the inner wall of the receiving portion 23.

[0091] Specifically, when the protrusion 22 is embedded in the receiving part 23, the upper and / or lower end faces of the protrusion 22 along the axial direction are tightly fitted with the corresponding inner wall surface of the receiving part 23. The end face fitting increases the contact area between the protrusion 22 and the receiving part 23, which on the one hand improves the interlocking stability between adjacent target disks 2 and reduces small relative movements during operation; on the other hand, it increases the heat conduction area between adjacent target disks 2, which is beneficial to conduct the heat of the electron beam bombardment area to the adjacent target disks 2 through the fitting surface of the protrusion 22 and the receiving part 23, thereby improving the overall temperature distribution uniformity of the anode target disk 10.

[0092] In some embodiments, the main body 1 may be a regular polygon, and the outer edge of the projection of the main body 1 along the axial direction includes multiple straight edges. The multiple straight edges are connected end to end along the circumference of the main body 1, and each mounting groove 11 is opened at the middle position of the corresponding straight edge.

[0093] Therefore, since the outer contour of the main body 1 is a regular polygon, the geometric conditions of each straight side are exactly the same. The mounting reference surface where the mounting groove 11 is located in the middle of each straight side is a plane, which is conducive to the precise machining of the mounting groove 11 and reduces the machining difficulty. At the same time, each mounting groove 11 is located in the same geometric position, and the mounting angle and stress state of each target plate 2 are consistent, which facilitates assembly quality control and batch consistency assurance. In a variation, the number of sides of the main body 1 can be, for example, equal to the number of target plates 2, to ensure that exactly one mounting groove 11 is opened on each straight side.

[0094] Combination Figure 2 and Figure 3In some embodiments, each target disk 2 further includes a bombarded portion 24, which is connected to one end of the insertion portion 21 that is radially away from the mounting groove 11. The side surface of the bombarded portion 24 near the main body portion 1 is adapted to the shape of the straight edge. The bombarded portions 24 of the plurality of target disks 2 installed in place are spliced ​​together circumferentially to form a complete bombarded surface P.

[0095] Therefore, the side surface of the bombarded part 24 near the main body 1 is adapted to the shape of the corresponding straight edge on the main body 1, so that the side surface of the bombarded part 24 can fit against the straight edge of the main body 1, increasing the contact area and improving the stability of the target plate 2 installation.

[0096] In some embodiments, a gap exists between two adjacent target discs 2 along the circumference of the main body 1.

[0097] Specifically, after two adjacent target discs 2 are spliced ​​together circumferentially, there is a non-zero gap, i.e., a seam, at the circumferential junction of the two.

[0098] It should be understood that the gap is naturally formed by the split structure. When the anode target disk 10 is working, the bombarded surface P is subjected to high temperature by electron beam bombardment, and each target disk plate 2 expands circumferentially due to heat. Since there is a gap between adjacent target disk plates 2, the circumferential thermal expansion of each target disk plate 2 is accommodated by the space of the gap, and no compressive stress is generated between the target disk plates 2. The gap provides the target disk plates 2 with the release space required for thermal expansion, effectively reducing the thermal stress generated by the obstruction of thermal expansion, and inhibiting the generation and propagation of cracks on the surface of the target disk plates 2 caused by the accumulation of thermal stress.

[0099] In one specific implementation, the circumferential width of the gap can be, for example, 0.1 mm to 0.5 mm at room temperature.

[0100] In some embodiments, the target disc 2 is made of tungsten, molybdenum, or a tungsten-molybdenum alloy.

[0101] In one specific embodiment, the bombarded part 24 and the insertion part 21 may also be made of different materials. For example, the bombarded part 24 may be made of tungsten to ensure bombardment resistance, and the insertion part 21 may be made of molybdenum to reduce weight.

[0102] In some embodiments, the number of target discs 2 is 4 to 12.

[0103] Specifically, if the number of target discs 2 is too small, the circumferential span of a single target disc 2 is too large, resulting in a high degree of thermal stress concentration within the disc and limited thermal stress release effect of the split structure. If the number of target discs 2 is too large, the assembly process becomes cumbersome, the splicing precision requirements between the target discs 2 are high, and too many gaps may reduce the effective area ratio of the bombarded surface P. A good balance is achieved between 4 and 12 target discs 2, considering thermal stress release capability, assembly efficiency, and the continuity of the bombarded surface P.

[0104] In one specific implementation, the number of target discs 2 can be, for example, 6 or 8 discs.

[0105] Reference Figure 1 and Figure 4 In some embodiments, the present invention also provides an anode assembly 100. The anode assembly 100 may include: the anode target disk 10 as described in any of the above embodiments; and a rotor 4 for driving the anode target disk 10 to rotate.

[0106] Specifically, the rotor 4 is connected to the anode target disk 10 by transmission. The rotor 4 rotates under the action of an external electromagnetic field, driving the anode target disk 10 to rotate at high speed, so that the bombardment position of the electron beam on the bombarded surface P of the anode target disk 10 changes continuously, avoiding overheating of the local position of the bombarded surface P due to continuous bombardment.

[0107] In one specific embodiment, rotor 4 may be, for example, a permanent magnet rotor.

[0108] In some embodiments, the anode assembly 100 may further include: a central shaft portion 5, which passes through the anode target disk 10; and a bushing portion 6, which is sleeved on the central shaft portion 5. The anode target disk 10 and the rotor 4 are respectively fixedly connected to the two ends of the bushing portion 6, and the rotor 4 drives the anode target disk 10 to rotate about the central shaft portion 5 through the bushing portion 6.

[0109] Specifically, the central shaft portion 5 is fixedly disposed on the anode assembly 100, extends along the axial direction of the anode target disk 10 and passes through the central mounting hole of the anode target disk 10. The central shaft portion 5 remains stationary and does not rotate during operation, providing a rotation axis for each rotating component outside the central shaft portion 5.

[0110] Furthermore, the bushing 6 is fitted outside the central shaft 5 and can rotate around the central shaft 5.

[0111] Furthermore, the inner cavity of the bushing 6 accommodates the central shaft 5, and the outer peripheral surface of the bushing 6 is used to connect the anode target disk 10 and the rotor 4.

[0112] Furthermore, the rotor 4 indirectly drives the anode target disk 10 to rotate via the bushing portion 6. The rotation of the rotor 4 causes the bushing portion 6 to rotate synchronously, and the bushing portion 6 drives the anode target disk 10, which is fixedly connected to the bushing portion 6, to rotate about the central shaft portion 5. The anode target disk 10 and the rotor 4 are located at opposite ends of the bushing portion 6, and are axially spaced apart, facilitating independent assembly and disassembly. When it is necessary to replace the target disk 2, only the locking part 3 in the area of ​​the anode target disk 10 needs to be operated, without disassembling the rotor 4.

[0113] Furthermore, the bushing portion 6 includes a connecting section 61 along the axial direction, the anode target disk 10 is sleeved on the connecting section 61, at least a portion of the connecting section 61 extends out of the anode target disk 10, and the locking member 3 is connected to the connecting section 61.

[0114] Specifically, the connecting section 61 is used to install and position the anode target disk 10, and the main body 1 of the anode target disk 10 is sleeved on the outer periphery of the connecting section 61.

[0115] Furthermore, at least a portion of the connecting section 61 extends out of the main body 1 of the anode target disk 10 along the axial direction, and the locking member 3 is connected to the extended portion of the connecting section 61, thereby pressing and fixing the main body 1 of the anode target disk 10 onto the connecting section 61 of the bushing portion 6 from the axial direction.

[0116] Furthermore, the connection between the locking member 3 and the connecting section 61 can be a threaded connection. For example, the outer circumferential surface of the protruding part of the connecting section 61 is provided with external threads, and the locking member 3 can be a locking nut that mates with the thread of the connecting section 61. Tightening the locking member 3 will press the anode target disk 10 axially against the bushing part 6.

[0117] Thus, the anode target disk 10 is fixed to the connecting section 61 of the bushing part 6 by the locking member 3. When it is necessary to disassemble and replace the anode target disk 10, simply loosen and remove the locking member 3 to remove the entire anode target disk 10 from the connecting section 61. When installing and removing the anode target disk 10, it is not necessary to operate the target disk pieces 2 one by one. After the anode target disk 10 is removed from the bushing part 6, the target disk pieces 2 can be replaced externally, improving maintenance efficiency.

[0118] In some embodiments, the end face of the locking member 3 facing the main body 1 may also be provided with a boss structure. This reduces the contact area between the locking member 3 and the main body 1, as well as the insertion portion 21 of the target disc 2, thereby increasing the pressure and improving the locking effect.

[0119] Combination Figures 4 to 6 In some embodiments, there is a non-zero gap between the outer peripheral surface of the central shaft portion 5 and the inner wall of the bushing portion 6, the gap forming a filling cavity, the filling cavity being filled with liquid metal, and the central shaft portion 5, the bushing portion 6 and the liquid metal in the filling cavity cooperating to form a liquid metal bearing.

[0120] Specifically, the bushing portion 6 is fitted onto the outside of the central shaft portion 5. The outer circumferential surface of the central shaft portion 5 and the inner wall of the bushing portion 6 are not tightly fitted; rather, there is a non-zero gap, meaning a certain radial space is reserved between them. This gap encloses an annular filling cavity, which extends axially within the section where the central shaft portion 5 and the bushing portion 6 are nested together. Furthermore, the filling cavity is filled with liquid metal.

[0121] In some embodiments, the liquid metal may be, for example, a gallium indium tin alloy.

[0122] When the anode assembly 100 is operating, the rotor 4 drives the bushing 6 to rotate at high speed around the central shaft 5. Under the action of rotational centrifugal force and dynamic pressure effect, the liquid metal in the filling cavity forms a liquid metal lubricating film between the outer peripheral surface of the central shaft 5 and the inner wall of the bushing 6, achieving contactless rotational support of the bushing 6 relative to the central shaft 5. The central shaft 5, the bushing 6, and the liquid metal in the filling cavity together constitute a liquid metal bearing.

[0123] Therefore, compared with traditional ball bearings, liquid metal bearings have the advantages of high load-bearing capacity, smooth operation, and low vibration and noise. At the same time, liquid metal itself has a high thermal conductivity, which can conduct the heat generated by the anode target disk 10 under electron beam bombardment to the liquid metal through the bushing part 6, and then from the liquid metal to the central shaft part 5, achieving efficient heat dissipation and effectively extending the service life of the anode assembly 100.

[0124] In some embodiments, the bushing portion 6 is provided with sealing flanges 7 at both ends along the axial direction. The sealing flanges 7 are sleeved on the central shaft portion 5 and close the openings of the filling cavity on both sides along the axial direction.

[0125] Specifically, the sealing flange 7 is sleeved on the outer periphery of the central shaft portion 5, and the sealing flange 7 is located at both ends of the bushing portion 6 along the axial direction, respectively sealing the openings at both ends of the filling cavity that communicate with the outside along the axial direction. The sealing flange 7 is fixedly connected to the bushing portion 6, and when the anode assembly 100 is working, the sealing flange 7 rotates synchronously with the bushing portion 6 around the central shaft portion 5.

[0126] Therefore, the sealing flange 7 seals the openings on both sides of the filling cavity along the axial direction, which can effectively prevent the liquid metal from leaking from both ends of the filling cavity under the centrifugal force generated by the high-speed rotation of the bushing part 6, thus ensuring the sealing performance and long-term stable operation of the liquid metal bearing.

[0127] In some embodiments, a protruding ring portion 51 may also be provided on the central shaft portion 5. The protruding ring portion 51 protrudes radially outward from the outer peripheral surface of the central shaft portion 5, forming an annular step.

[0128] In some embodiments, the convex ring portion 51 may be located approximately at the center of the bushing portion 6 along the axial direction.

[0129] In some embodiments, the bushing portion 6 further includes a mating section 62, wherein the connecting section 61 and the mating section 62 are arranged adjacent to each other along the axial direction, and the radial dimension of the mating section 62 is larger than the radial dimension of the connecting section 61, such that a stepped structure is formed at the junction of the mating section 62 and the connecting section 61. After the main body portion 1 of the anode target disk 10 is fitted onto the connecting section 61, the end face of the main body portion 1 along the axial direction (the other side forming the bombarded surface P) abuts against the stepped structure, and the stepped structure provides axial positioning for the main body portion 1.

[0130] Furthermore, the end of the mating section 62 furthest from the connecting section 61 is directly or indirectly connected to the rotor 4, so that the driving force of the rotor 4 is transmitted to the anode target disk 10 through the mating section 62 and the connecting section 61.

[0131] Furthermore, there is a non-zero gap between the end face of the mating section 62 away from the connecting section 61 and the end face of the convex ring portion 51. This gap connects to the filling cavity and forms part of the filling cavity, and the gap is filled with liquid metal. The convex ring portion 51 forms an axial limit on the mating section 62 through the liquid metal in the gap, restricting the axial movement of the bushing portion 6.

[0132] Furthermore, a connecting ring 8 is sleeved on the outside of the convex ring portion 51, and the connecting ring 8 rotates synchronously with the bushing portion 6.

[0133] Furthermore, the sealing flange 7 is fixedly connected to the connecting ring 8 and the bushing 6. For example, the sealing flange 7, the connecting ring 8 and the mating section 62 can be fixedly connected together simultaneously by connecting screws.

[0134] Furthermore, a sealing groove may be provided on the end face of the sealing flange 7 facing the convex ring portion 51. The sealing groove is used to enhance the sealing effect between the sealing flange 7 and the convex ring portion 51, and further prevent liquid metal leakage.

[0135] In some embodiments, liquid metal is filled between the outer peripheral surface of the convex ring portion 51 and the inner wall of the connecting ring 8, between the inner peripheral surface of the sealing flange 7 and the outer peripheral surface of the convex ring portion 51, and between the inner wall of the bushing portion 6 and the outer peripheral surface of the central shaft portion 5. The above gaps are all components of the filling cavity.

[0136] In some embodiments, the bushing portion 6 may also have a liquid injection hole that communicates with the filling cavity, the liquid injection hole being used to inject liquid metal into the filling cavity after assembly.

[0137] In some embodiments, the central shaft portion 5 may have a hollow structure that extends axially along the central shaft portion 5, with an opening communicating with the outside. The hollow structure may be filled with a cooling medium, such as cooling oil or cooling water, which flows within the hollow structure to remove heat conducted to the central shaft portion 5 via the liquid metal, further enhancing the heat dissipation capacity of the anode assembly 100.

[0138] It should be understood that in the anode assembly 100, the central shaft 5 is fixed during operation; the rotor 4, sealing flange 7, connecting ring 8, bushing 6, main body 1, locking member 3, and each target disc 2 are all rotating parts, and the above rotating parts are directly or indirectly fixedly connected to each other and rotate synchronously with the bushing 6.

[0139] In some embodiments, the central shaft portion 5 may be made of ceramic material to improve the heat resistance and electrical insulation properties of the central shaft portion 5.

[0140] This invention also provides an X-ray tube. The X-ray tube may include the anode assembly 100 described in any of the above embodiments.

[0141] Because the X-ray tube adopts the above-mentioned split anode target plate 10 and liquid metal bearing structure, the X-ray tube has the advantages of replaceable single target plate 2, effective release of thermal stress and long bearing life, while the overall structure is compact and the operation is reliable. It is suitable for medical imaging diagnostic equipment such as CT equipment and DSA angiography equipment.

[0142] Therefore, by adopting the technical solution of this application, the anode target disk 10 adopts a split structure. The target disk pieces 2 are detachably inserted into the mounting groove 11 of the main body 1 through the insertion part 21 and locked by the locking member 3. When individual target disk pieces 2 fail due to electron beam bombardment, the failed target disk piece 2 can be disassembled and replaced individually without replacing the entire anode target disk 10, significantly reducing maintenance costs. Furthermore, the split structure naturally creates a separation between each target disk piece 2, that is, there is a certain gap between adjacent target disk pieces 2, which provides conditions for thermal expansion and thermal stress release compared to the traditional integral target disk.

[0143] Furthermore, the projection of the bottom 111 extends at least partially beyond the area of ​​the opening 112, meaning the mounting groove 11 has a cross-sectional shape that is wider at the bottom and narrower at the opening. After the insertion part 21 is inserted, the portion of the bottom 111 that is wider than the opening 112 forms a radial engagement with the insertion part 21, effectively preventing the target plate 2 from radially dislodging from the mounting groove 11 under centrifugal force when the anode target plate 10 rotates at high speed, thus improving the locking reliability.

[0144] Furthermore, the cross-sectional shape of the insertion part 21 is adapted to the cross-sectional shape of the mounting groove 11, so that the two fit tightly, reducing assembly gaps and loosening during operation; the T-shaped or trapezoidal cross-section utilizes the geometric characteristics of a wide bottom and narrow opening, and the insertion part 21 achieves radial limiting after being inserted axially, which can prevent the target plate 2 from flying out radially without additional fasteners, simplifying the structure.

[0145] Furthermore, the mounting groove 11 extends axially through both ends of the main body 1, allowing the insertion part 21 to be directly inserted from the end, simplifying the assembly path. The first locking part and the second locking part respectively close the openings on both sides, restricting the movement of the insertion part 21 from both axial ends. The double-end locking force is uniform, improving the structural stability under high-speed rotation.

[0146] Furthermore, the mounting groove 11 has an open end 113 and a closed end 114. The closed end 114 forms an axial positioning stop for the insertion part 21. The insertion part 21 is inserted from the open end 113 to the closed end 114 and is in place, with clear positioning. Thus, only one side of the locking member 3 is needed to close the open end 113 to complete the fixation, reducing the number of locking members 3 and simplifying the assembly steps.

[0147] Furthermore, adjacent target discs 2 are interlocked circumferentially through the cooperation of the protrusion 22 and the receiving part 23, which prevents relative misalignment of adjacent target discs 2 in the circumferential direction, ensures the flatness and continuity of the bombarded surface P formed by splicing, and avoids steps at the joint of adjacent target discs 2 that would affect the quality of X-ray generation.

[0148] Furthermore, the protrusion 22 and the receiving part 23 are located on the other side of the target disk 2 used to splice together the bombarded surface P, which does not affect the flatness of the bombarded surface P.

[0149] Furthermore, the multiple target discs 2 have the same shape, which facilitates mass production and reduces mold costs.

[0150] Furthermore, the thickness of the protrusion 22 does not exceed one-third of the total thickness of the target disc 2, ensuring the structural strength of the main body of the target disc 2 and avoiding the protrusion 22 being too thick, which would result in a weak cross section.

[0151] Furthermore, at least one end face of the protrusion 22 is in contact with the inner wall of the receiving part 23, increasing the contact area, improving interlocking stability, and improving heat conduction between adjacent target discs 2.

[0152] Furthermore, the main body 1 is a regular polygon, with each mounting groove 11 located in the middle of its corresponding straight edge. The geometric conditions of the straight edges containing each mounting groove 11 are completely consistent, ensuring uniform mounting angle and stress state of the target disc 2, thus simplifying machining and assembly. The straight edges provide a flat machining reference surface for the mounting grooves 11, facilitating the precise cutting of the mounting grooves 11.

[0153] Furthermore, there are gaps between adjacent target discs 2 to provide space for thermal expansion, effectively release thermal stress, and suppress the generation of cracks caused by temperature gradients.

[0154] It should be understood that the term "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, the character " / " in this document indicates that the preceding and following related objects are in an "or" relationship. As used herein, unless explicitly stated otherwise, the term "or" covers all possible combinations unless impractical. For example, if a component is declared to include A or B, then unless explicitly stated otherwise or impractical, the component can include A, or B, or A and B. As a second example, if a component is declared to include A, B, or C, then unless explicitly stated otherwise or impractical, the component can include A, or B, or C, or A and B, or A and C, or B and C, or A and B and C.

[0155] In this embodiment of the invention, "multiple" refers to two or more.

[0156] Relational terms appearing in the embodiments of this utility model, such as "first," "second," etc., are used only to distinguish an entity or operation from another entity or operation, without requiring or implying any actual relationship or order between these entities or operations. Furthermore, the words "comprising," "having," and "including," and other similar forms, are intended to be equivalent in meaning and are open-ended; one or more items following any of these words do not imply an exhaustive list of such items or that they are limited to only the listed items. Exemplary embodiments have been disclosed in the drawings and specification. However, many variations and modifications can be made to these embodiments. Therefore, although specific terminology is used, it is used only in a general and descriptive sense and not for limiting purposes.

[0157] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A split-type anode target disk, characterized in that, include: The main body is provided with multiple mounting slots, which are arranged at intervals along the circumference of the main body. Multiple target discs are provided, and the multiple target discs and the multiple mounting slots correspond one-to-one. Each target disc includes a plug-in part, which is detachably inserted into the corresponding mounting slot. The multiple target discs located in the corresponding mounting slots are spliced ​​together to form the bombarded surface of the anode target disc. A locking element is detachably connected to the main body and is used to lock the plurality of target discs into the corresponding mounting slots.

2. The anode target disk according to claim 1, characterized in that, Each of the mounting slots includes a slot bottom and a slot opening, wherein the slot opening is radially outward along the body portion, and at least a portion of the projection of the slot bottom extends beyond the area of ​​the slot opening along the radial direction of the body portion.

3. The anode target disk according to claim 2, characterized in that, The cross-sectional shape of the portion of the connector located within the mounting groove is adapted to the cross-sectional shape of the mounting groove; and / or The cross-sectional shape of the mounting groove is T-shaped or trapezoidal.

4. The anode target disk according to claim 2, characterized in that, Each of the mounting slots extends through the opposite two end faces of the main body along the axial direction. The locking member includes a first locking part and a second locking part, which are detachably connected to the two end faces of the main body along the axial direction to close the openings on both sides of the mounting slot.

5. The anode target disk according to claim 2, characterized in that, The mounting groove has an open end and a closed end along the axial direction of the main body. The insertion part is inserted into the corresponding mounting groove through the open end. The locking member is detachably connected to the main body and closes the open end.

6. The anode target disk according to claim 1, characterized in that, For any two adjacent target discs among the plurality of target discs, the preceding target disc has a protrusion extending toward the following target disc, and the following target disc has a receiving portion for receiving the protrusion.

7. The anode target disk according to claim 6, characterized in that, The protrusion and the receiving part are located on the other side of the target disk used to assemble the bombarded surface; and / or The multiple target discs have the same shape; and / or Along the axial direction of the main body, the thickness of the protrusion does not exceed one-third of the total thickness of the target disc; and / or Along the axial direction of the main body, at least one end face of the protrusion is in contact with the inner wall of the receiving part.

8. The anode target disk according to claim 1, characterized in that, The main body is generally in the shape of a regular polygon. The outer edge of the projection of the main body along the axial direction includes multiple straight edges. The multiple straight edges are connected end to end along the circumference of the main body. Each mounting groove is opened at the middle position of the corresponding straight edge.

9. The anode target disk according to claim 8, characterized in that, Each target disc also includes a bombarded portion, which is connected to one end of the insertion portion that is radially away from the mounting groove. The side surface of the bombarded portion near the main body is adapted to the shape of the straight edge. The bombarded portions of the multiple target discs installed in place are spliced ​​together circumferentially to form a complete bombarded surface.

10. The anode target disk according to claim 1, characterized in that, Along the circumferential direction of the main body, there is a gap between two adjacent target discs; and / or The target disk is made of tungsten, molybdenum, or a tungsten-molybdenum alloy; and / or The number of target discs is 4 to 12.

11. An anode assembly, characterized in that, include: Anode target disk as described in any one of claims 1-10; The rotor is used to drive the anode target disk to rotate.

12. The anode assembly according to claim 11, characterized in that, Also includes: The central axis extends through the anode target disk; A bushing portion is fitted onto the central shaft portion. The anode target disk and the rotor are respectively fixedly connected to both ends of the bushing portion. The rotor drives the anode target disk to rotate around the central shaft portion through the bushing portion.

13. The anode assembly according to claim 12, characterized in that, The bushing includes a connecting section along the axial direction, the anode target disk is sleeved on the connecting section, at least a portion of the connecting section extends out of the anode target disk, and the locking member is connected to the connecting section.

14. The anode assembly according to claim 12, characterized in that, There is a non-zero gap between the outer peripheral surface of the central shaft and the inner wall of the bushing, the gap forming a filling cavity, the filling cavity being filled with liquid metal, and the central shaft, the bushing, and the liquid metal in the filling cavity cooperating to form a liquid metal bearing.

15. The anode assembly according to claim 14, characterized in that, The bushing portion is provided with sealing flanges at both ends along the axial direction. The sealing flanges are fitted onto the central shaft portion and close the openings of the filling cavity on both sides along the axial direction.

16. An X-ray tube, characterized in that, Includes the anode assembly as described in any one of claims 11-15.

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