Single-source 0-mega bulb tube cathode head assembly

Abstract

The invention relates to the field of bulb tube cathode heads, in particular to a single-source 0-mega bulb tube cathode head assembly which comprises a ceramic column core and a blocking wire movably connected to the inner side wall face of the ceramic column core in a sleeving mode, a kovar sleeve is arranged on the inner side wall face of the ceramic column core, two sets of blocking wire sleeve holes are formed in the kovar sleeve, and the blocking wire sleeve holes are connected with the ceramic column core in a sleeving mode. An aerogel heat insulation layer is arranged on the inner side wall face and located in the middle of the wire blocking sleeve hole, the inner side wall faces of the two ends of the wire blocking sleeve hole are movably connected with two butt joint limiting cylinders in a sleeved mode, and four swing plates are connected to the outer side surfaces of the butt joint limiting cylinders in a swing mode. After the blocking wire is installed and during transportation, the anti-contact sleeve heads are connected to the surfaces, exposed out of the two sides of the Kovar sleeve, of the blocking wire in a sleeving mode, at the moment, the perpendicularity of the blocking wire is increased through cooperation with the limiting supporting strips on the inner side wall faces of the anti-contact sleeve heads, meanwhile, the two sets of anti-contact sleeve heads are supported through cooperation with the square anti-deformation wire, and the stability and the anti-shaking force of the anti-contact sleeve heads are kept; and the vertical state is always kept by utilizing the toughness of the plurality of groups of limiting support strips.

Description

Technical Field

[0001] This invention belongs to the field of X-ray tube cathode head technology, specifically a single-source 0 MHz X-ray tube cathode head assembly. Background Technology

[0002] CT scanners are fully functional instruments for detecting diseases. With the development of technology, CT scanners have been widely used due to their high resolution and intuitive, accurate diagnostic results. The main component of a CT tube is the X-ray tube, which mainly consists of an anode, a cathode, and a glass shell. The cathode head assembly in the X-ray tube is mainly composed of a filament, a molybdenum branch, a magnetic bead, a nickel plate, a filament baffle, and the cathode head. Among these, the processing and structural design of the cathode head are crucial. The filament, made of tungsten wire, emits a sufficient number of electrons at high temperatures, serving as an electron source. A sufficient voltage (kilovolt level) is applied between the anode and cathode to form a strong electric field, accelerating the electrons towards the anode and forming a high-speed electron stream. The anode's role is to attract and accelerate electrons, causing the high-speed electrons to strike the target surface of the anode head. The target surface is bombarded by electrons, causing it to be sharply blocked and generating X-rays.

[0003] A patent with publication number CN210120108U discloses a cathode head assembly, including a cathode head body, a filament assembly, a filament groove, a focusing groove, a molybdenum branch, ceramic beads, and a nickel tube. The cathode head body is integrally formed, and its upper end is provided with a V-shaped groove with a longitudinal section that is high on both sides and low in the middle. The focusing groove is disposed on the V-shaped groove, and its groove opening is located within the boundary range of the V-shaped groove. The groove opening range of the filament groove is not greater than the groove opening range of the focusing groove. This utility model has an ingenious structure. By not completely cutting the focusing groove, the focusing groove is contained within the surface of the cathode head, avoiding the generation of sharp corners during processing, which would cause internal damage and cracking on the glass outer shell. This also avoids black marks on the appearance of the X-ray tube and improves the electrical performance of the X-ray tube, thereby increasing the product yield.

[0004] In the current technology, when installing existing cathode head assemblies, the baffle wire cannot be kept in the center of the ceramic core. This causes the baffle wire to be too biased to one side of the ceramic core. If the biased baffle wire is close to other metal parts, uneven local heat radiation will cause thermal stress deformation.

[0005] Therefore, the present invention provides a single-source 0-megawatt X-ray tube cathode head assembly. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical solution adopted by the present invention to solve its technical problem is as follows: A single-source 0-megawatt X-ray tube cathode head assembly of the present invention includes a ceramic core and a baffle wire movably sleeved on the inner wall of the ceramic core. The inner wall of the ceramic core is provided with a Kovar sleeve. The Kovar sleeve has two sets of baffle wire sleeve holes. An aerogel insulation layer is provided on the inner wall of the baffle wire sleeve hole at the middle position. Two sets of docking limiting cylinders are movably sleeved on the inner wall of both ends of the baffle wire sleeve hole. Four sets of swing plates are oscillatingly connected to the outer surface of the docking limiting cylinder. Anti-slip soft blocks that are movably attached to the outer surface of the baffle wire are fixedly connected to the inner wall of the swing plates.

[0008] Preferably, the bottom surface of the Kovar sleeve is provided with a mating groove, and the outer surface of the four sets of swing plates is provided with a deformation cavity.

[0009] Preferably, a docking limiting post is fixedly connected to the bottom inner wall of the ceramic core, and the outer surface of the docking limiting post is movably sleeved on the inner wall of the docking groove.

[0010] Preferably, the inner wall of the ceramic core is fixedly connected with a mating limiting strip, and the outer surface of the Kovar sleeve is provided with a limiting groove.

[0011] Preferably, both ends of the baffle wire are movably sleeved with anti-touch sleeves, and one side surface of the anti-touch sleeves movably overlaps the outer surface of the ceramic core and the Kovar sleeve.

[0012] Preferably, the outer surface of the docking limiting strip is movably attached to the inner wall of the limiting groove, and the outer surface of the anti-touch sleeve head is provided with a square-shaped anti-deformation wire.

[0013] Preferably, the inner wall of the anti-touch sleeve head is provided with multiple sets of limiting support strips, and the outer surface of the limiting support strips is movably attached to the outer surface of the baffle wire.

[0014] Preferably, a cathode head is provided on the outer surface of the ceramic core, a flat filament is provided at one end of the two baffle wires, a spot weld is provided at the junction of the flat filament and the baffle wire, a brazing head is provided at the junction of the Kovar sleeve and the ceramic core, an argon arc weld is provided on the bottom surface of the cathode head, and a slot is provided on the outer surface of the cathode head.

[0015] Preferably, the outer surface of the docking limiting cylinder is provided with four sets of holes and slots, and the bottom surface of the swing plate is disposed on the bottom inner wall of the holes and slots.

[0016] Preferably, the outer surface of the aerogel insulation layer is movably attached to the outer surface of the baffle wire, and the outer surface of the docking limiting cylinder is movably attached to the inner wall surface of the aerogel insulation layer.

[0017] The beneficial effects of this invention are as follows: 1. The single-source 0 MHz X-ray tube cathode head assembly of the present invention involves inserting a baffle wire into the inside of the baffle wire sleeve hole and attaching it to the outer surface of the baffle wire through an aerogel insulation layer. When the baffle wire is energized, the aerogel insulation layer can isolate the heat source generated on the surface of the baffle wire, reducing the heat transfer from the surface of the baffle wire. At this time, two sets of docking limiting cylinders are respectively sleeved on the inner walls of both ends of the baffle wire, and one end of the docking limiting cylinder is squeezed and clamped into the inside of the baffle wire sleeve hole. As the docking limiting cylinder goes deeper, the inner wall of the baffle wire sleeve hole will squeeze the outer surface of the swing plate, causing the swing plate to extend and push towards the inner wall of the docking limiting cylinder, and causing the anti-slip soft block on the inner wall of the swing plate to adhere to the outer surface of the baffle wire. With the four sets of swing plates being squeezed in the same direction in the baffle wire sleeve hole, the baffle wire is positioned in the center of the docking limiting cylinder, so that the baffle wire will not deviate from any direction of the docking limiting cylinder. 2. In the single-source 0M tube cathode head assembly of the present invention, after the baffle wire is installed, during transportation, the anti-contact sleeve head is fitted onto the exposed baffle wire surfaces on both sides of the Kovar sleeve. At this time, the limiting support strip on the inner wall of the anti-contact sleeve head increases the verticality of the baffle wire. At the same time, the U-shaped anti-deformation wire supports the two sets of anti-contact sleeve heads, maintaining the stability and anti-shaking force of the anti-contact sleeve heads. The toughness of multiple sets of limiting support strips is used to maintain the vertical state, so that the baffle wire will not be deformed or bent due to external pressure and contact during the transportation of the ceramic core. 3. In the single-source 0 MHz X-ray tube cathode head assembly described in this invention, when the baffle wire is firmly positioned on the inner wall of the baffle wire sleeve hole, the Kovar sleeve is fitted inside the ceramic core. At this time, the mating limiting post is inserted into the mating groove. The mating limiting post ensures that the position of the Kovar sleeve is vertical, which greatly avoids the situation where the baffle wire is tilted and there is no effective mating or poor contact when installing the ceramic core. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a perspective view of the present invention; Figure 2 This is a three-dimensional cross-sectional view of the cathode head in this invention; Figure 3 This is a three-dimensional view of the ceramic core in this invention; Figure 4 This is a perspective cross-sectional view of the Kovar casing in this invention; Figure 5 This is a three-dimensional cross-sectional view of the docking limiting cylinder in this invention; Figure 6 This is a three-dimensional sectional view of the ceramic core and Kovar sleeve in this invention. Figure 7 This is a three-dimensional cross-sectional view of the anti-touch sleeve head in this invention.

[0020] In the diagram: 11. Cathode head; 111. Slot; 112. Brazing head; 113. Argon arc welding; 114. Butt welding head; 115. Flat filament; 12. Ceramic core; 121. Kovar sleeve; a1. Limiting groove; a2. Butt limiting strip; a3. Butt limiting post; 122. Wire-stopping sleeve hole; 123. Aerogel insulation layer; 124. Butt limiting cylinder; 125. Butt groove; 126. Hole slot; 127. Swing plate; 128. Deformation cavity; 129. Anti-slip soft block; 1210. Anti-touch sleeve head; c1. Limiting support strip; c2. U-shaped anti-deformation wire; 13. Wire stop. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figures 2 to 6 As shown, an embodiment of the present invention provides a single-source 0 MHz X-ray tube cathode head assembly, including a ceramic core 12 and a baffle wire 13 movably sleeved on the inner wall of the ceramic core 12. A Kovar sleeve 121 is provided on the inner wall of the ceramic core 12. Two sets of baffle wire sleeve holes 122 are opened inside the Kovar sleeve 121. An aerogel insulation layer 123 is provided on the inner wall of the baffle wire sleeve hole 122 at the middle position. Two sets of docking limiting cylinders 124 are movably sleeved on the inner walls at both ends of the baffle wire sleeve hole 122. The outer surface of the device is oscillatingly connected with four sets of oscillating plates 127. The inner wall of the oscillating plate 127 is fixedly connected with an anti-slip soft block 129 that is movably attached to the outer surface of the baffle wire 13. The outer surface of the docking limiting cylinder 124 is provided with four sets of holes and slots 126. The bottom surface of the oscillating plate 127 is set on the bottom inner wall of the holes and slots 126. The outer surface of the aerogel insulation layer 123 is movably attached to the outer surface of the baffle wire 13. The outer surface of the docking limiting cylinder 124 is movably attached to the inner wall of the aerogel insulation layer 123.

[0023] The baffle wire 13 is inserted into the baffle wire sleeve hole 122 and attached to the outer surface of the baffle wire 13 by the aerogel insulation layer 123. When the baffle wire 13 is energized, the aerogel insulation layer 123 can isolate the heat source generated on the surface of the baffle wire 13, reducing the heat transfer from the surface of the baffle wire 13. At this time, two sets of docking limiting cylinders 124 are respectively sleeved on the inner wall surfaces of both ends of the baffle wire 13, and one end of the docking limiting cylinder 124 is squeezed and clamped into the inside of the baffle wire sleeve hole 122. As the docking limiting cylinder 124 is inserted deeper... When the wire-stopping sleeve hole 122 is inserted, the inner wall surface of the wire-stopping sleeve hole 122 will press against the outer surface of the swing plate 127, causing the swing plate 127 to extend and push towards the inner wall surface of the docking limiting cylinder 124, and causing the anti-slip soft block 129 on the inner wall surface of the swing plate 127 to adhere to the outer surface of the wire-stopping sleeve 13. As the four sets of swing plates 127 are pressed in the same direction by the wire-stopping sleeve hole 122, the wire-stopping sleeve 13 is positioned in the center of the docking limiting cylinder 124, so that the wire-stopping sleeve 13 will not deviate from any direction of the docking limiting cylinder 124. Meanwhile, Kovar casing is a type of pipe made of Kovar alloy, a typical iron-nickel-cobalt alloy with unique thermal properties and excellent sealing performance. It is a material with high thermal expansion, high temperature resistance and mechanical properties.

[0024] like Figures 4 to 6 As shown, the bottom surface of the Kovar sleeve 121 is provided with a docking groove 125, the outer surface of the four sets of swing plates 127 is provided with a deformation cavity 128, and the bottom inner wall of the ceramic core 12 is fixedly connected with a docking limiting post a3, and the outer surface of the docking limiting post a3 is movably sleeved on the inner wall of the docking groove 125.

[0025] When the retaining wire 13 is firmly positioned on the inner wall of the retaining wire sleeve hole 122, the Kovar sleeve 121 is fitted into the ceramic core 12. At this time, the mating limiting post a3 is inserted into the mating groove 125. The mating limiting post a3 ensures that the position of the Kovar sleeve 121 is vertical, which greatly avoids the retaining wire 13 being tilted, which could lead to ineffective mating or poor contact when installing the ceramic core 12.

[0026] like Figures 2 to 4 and Figure 6 - Figure 7As shown, a docking limiting strip a2 is fixedly connected to the inner wall of the ceramic core 12, a limiting groove a1 is opened on the outer surface of the Kovar sleeve 121, and anti-touch sleeves 1210 are movably sleeved at both ends of the baffle wire 13. One side surface of the anti-touch sleeve 1210 is movably overlapped with the outer surface of the ceramic core 12 and the Kovar sleeve 121. The outer surface of the docking limiting strip a2 is movably attached to the inner wall of the limiting groove a1. A U-shaped anti-deformation wire c2 is provided on the outer surface of the anti-touch sleeve 1210. Multiple sets of limiting support strips c1 are provided on the inner wall of the anti-touch sleeve 1210. The outer surface of the limiting support strip c1 is movably attached to the outer surface of the baffle wire 13.

[0027] When the Kovar sleeve 121 is inserted into the ceramic core 12, it is engaged with the inner wall of the ceramic core 12 by the engagement limiting strip a2, which is then engaged into the limiting groove a1. The multiple engagement limiting strips a2 are used to increase the friction and engagement force between the Kovar sleeve 121 and the Kovar sleeve 121, so that the Kovar sleeve 121 will not be easily removed or become loose. After the baffle 13 is installed, during transportation, the anti-touch sleeve 1210 is fitted onto the exposed baffle 13 surfaces on both sides of the Kovar sleeve 121. At this time, the limiting support strip c1 on the inner wall of the anti-touch sleeve 1210 increases the verticality of the baffle 13. At the same time, the U-shaped anti-deformation wire c2 supports the two sets of anti-touch sleeves 1210, maintaining the stability and anti-shaking force of the anti-touch sleeves 1210. The toughness of the multiple sets of limiting support strips c1 is used to maintain the vertical state, so that the ceramic core 12 will not be deformed or bent due to external pressure or contact during transportation.

[0028] like Figures 1 to 2 As shown, a cathode head 11 is provided on the outer surface of the ceramic core 12, a flat filament 115 is provided at one end of the two baffle wires 13, a spot weld head 114 is provided at the joint between the flat filament 115 and the baffle wires 13, a brazing head 112 is provided at the joint between the Kovar sleeve 121 and the ceramic core 12, an argon arc weld 113 is provided on the bottom surface of the cathode head 11, and a slot 111 is provided on the outer surface of the cathode head 11.

[0029] After the baffle wire 13 is installed, the ceramic core 12 is inserted into the inside of the cathode head 11. The position of the ceramic core 12 is limited by the snap-fit ​​limiting strip on the inner wall of the baffle wire 13. Then, the flat filament 115 is welded to one end of the two sets of baffle wires 13 by the spot welding head 114, which facilitates the subsequent power supply.

[0030] Working principle: The baffle wire 13 is inserted into the baffle wire sleeve hole 122 and is attached to the outer surface of the baffle wire 13 by the aerogel insulation layer 123. When the baffle wire 13 is energized, the aerogel insulation layer 123 can isolate the heat source generated on the surface of the baffle wire 13, reducing the heat transfer from the surface of the baffle wire 13. At this time, two sets of docking limiting cylinders 124 are respectively sleeved on the inner wall surfaces of both ends of the baffle wire 13, and one end of the docking limiting cylinder 124 is squeezed and clamped into the inside of the baffle wire sleeve hole 122. As the docking limiting cylinder 124 moves... As the cutting depth increases, the inner wall of the wire-stopping sleeve hole 122 will press against the outer surface of the swing plate 127, causing the swing plate 127 to extend and push towards the inner wall of the docking limiting cylinder 124, and causing the anti-slip soft block 129 on the inner wall of the swing plate 127 to adhere to the outer surface of the wire-stopping 13. As the four sets of swing plates 127 are pressed in the same direction by the wire-stopping sleeve hole 122, the wire-stopping 13 is positioned in the center of the docking limiting cylinder 124, so that the wire-stopping 13 will not deviate from any direction of the docking limiting cylinder 124. When the stop wire 13 is firmly positioned on the inner wall of the stop wire sleeve hole 122, the Kovar sleeve 121 is fitted into the ceramic core 12. At this time, the mating limit post a3 is inserted into the mating groove 125. The mating limit post a3 makes the position of the Kovar sleeve 121 vertical, which greatly avoids the stop wire 13 being tilted, which may cause ineffective mating or poor contact when installing the ceramic core 12. When the Kovar sleeve 121 is inserted into the ceramic core 12, it is engaged with the inner wall of the ceramic core 12 by the engagement limiting strip a2, which is then engaged into the limiting groove a1. The multiple engagement limiting strips a2 are used to increase the friction and engagement force between the Kovar sleeve 121 and the Kovar sleeve 121, so that the Kovar sleeve 121 will not be easily removed or become loose. After the baffle 13 is installed, during transportation, the anti-touch sleeve 1210 is fitted onto the exposed baffle 13 surfaces on both sides of the Kovar sleeve 121. At this time, the limiting support strip c1 on the inner wall of the anti-touch sleeve 1210 increases the verticality of the baffle 13. At the same time, the U-shaped anti-deformation wire c2 supports the two sets of anti-touch sleeves 1210, maintaining the stability and anti-shaking force of the anti-touch sleeves 1210. The toughness of the multiple sets of limiting support strips c1 is used to maintain the vertical state, so that the ceramic core 12 will not be deformed or bent due to external pressure or contact during transportation.

[0031] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A single-source 0 MHz X-ray tube cathode head assembly, comprising a ceramic core (12) and a retaining wire (13) movably sleeved on the inner wall of the ceramic core (12), characterized in that: The inner wall of the ceramic core (12) is provided with a Kovar sleeve (121). The Kovar sleeve (121) has two sets of wire-stopping holes (122) inside. An aerogel insulation layer (123) is provided on the inner wall of the wire-stopping hole (122) and located in the middle. Two sets of docking limiting cylinders (124) are movably sleeved on the inner wall of both ends of the wire-stopping hole (122). Four sets of swing plates (127) are oscillatingly connected to the outer surface of the docking limiting cylinder (124). Anti-slip soft blocks (129) that are movably attached to the outer surface of the wire (13) are fixedly connected to the inner wall of the swing plate (127).

2. The single-source 0 MHz X-ray tube cathode head assembly according to claim 1, characterized in that: The bottom surface of the Kovar sleeve (121) is provided with a mating groove (125), and the outer surface of the four sets of swing plates (127) is provided with a deformation cavity (128).

3. The single-source 0 MHz X-ray tube cathode head assembly according to claim 1, characterized in that: The bottom inner wall of the ceramic core (12) is fixedly connected to a docking limiting post (a3), and the outer surface of the docking limiting post (a3) ​​is movably sleeved on the inner wall of the docking groove (125).

4. The single-source 0 MHz X-ray tube cathode head assembly according to claim 1, characterized in that: The inner wall of the ceramic core (12) is fixedly connected with a docking limit strip (a2), and the outer surface of the Kovar sleeve (121) is provided with a limit groove (a1).

5. A single-source 0 MHz X-ray tube cathode head assembly according to claim 4, characterized in that: The two ends of the baffle wire (13) are respectively movably sleeved with anti-touch sleeves (1210), and one side surface of the anti-touch sleeves (1210) is movably overlapped on the outer surface of the ceramic core (12) and the Kovar sleeve (121).

6. A single-source 0 MHz X-ray tube cathode head assembly according to claim 5, characterized in that: The outer surface of the docking limiting strip (a2) is movably attached to the inner wall of the limiting groove (a1), and the outer surface of the anti-touch sleeve head (1210) is provided with a square-shaped anti-deformation wire (c2).

7. A single-source 0 MHz X-ray tube cathode head assembly according to claim 5, characterized in that: The inner wall of the anti-touch sleeve (1210) is provided with multiple sets of limiting support strips (c1), and the outer surface of the limiting support strips (c1) is movably attached to the outer surface of the baffle wire (13).

8. A single-source 0 MHz X-ray tube cathode head assembly according to claim 1, characterized in that: The outer surface of the ceramic core (12) is provided with a cathode head (11), one end of the two baffle wires (13) is provided with a flat filament (115), a weld head (114) is provided at the junction of the flat filament (115) and the baffle wire (13), a brazing head (112) is provided at the junction of the Kovar sleeve (121) and the ceramic core (12), an argon arc weld (113) is provided on the bottom surface of the cathode head (11), and a slot (111) is provided on the outer surface of the cathode head (11).

9. A single-source 0 MHz X-ray tube cathode head assembly according to claim 1, characterized in that: The outer surface of the docking limiting cylinder (124) is provided with four sets of holes and slots (126), and the bottom surface of the swing plate (127) is set on the bottom inner wall of the holes and slots (126).

10. A single-source 0 MHz X-ray tube cathode head assembly according to claim 1, characterized in that: The outer surface of the aerogel insulation layer (123) is movably attached to the outer surface of the baffle wire (13), and the outer surface of the docking limiting cylinder (124) is movably attached to the inner wall of the aerogel insulation layer (123).

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