CN219936989U - Cathode assembly and X-ray tube - Google Patents
Cathode assembly and X-ray tube Download PDFInfo
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- CN219936989U CN219936989U CN202321604176.9U CN202321604176U CN219936989U CN 219936989 U CN219936989 U CN 219936989U CN 202321604176 U CN202321604176 U CN 202321604176U CN 219936989 U CN219936989 U CN 219936989U
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- cathode
- grid
- assembly
- grid electrode
- base
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- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 239000012212 insulator Substances 0.000 claims description 15
- 230000000712 assembly Effects 0.000 claims description 3
- 238000000429 assembly Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 description 4
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000005461 Bremsstrahlung Effects 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- KGWWEXORQXHJJQ-UHFFFAOYSA-N [Fe].[Co].[Ni] Chemical compound [Fe].[Co].[Ni] KGWWEXORQXHJJQ-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Abstract
The utility model provides a cathode assembly and an X-ray tube, wherein the cathode assembly comprises a cathode base; a grid electrode connected with the cathode base; the grid electrode is connected with the cathode base through a connecting component; the cathode base is provided with a connecting hole which is formed along the vertical direction; the connecting assembly comprises insulating pieces arranged on two sides of the connecting hole along the vertical direction and connecting pieces penetrating through the insulating pieces and the connecting hole; the connector is configured to be non-contact with the cathode base and fixed in conjunction with the grid. The cathode assembly can ensure the assembly precision of the X-ray tube, reduce the assembly difficulty and increase the reliability.
Description
Technical Field
The utility model relates to the technical field of medical appliances. And more particularly to a cathode assembly and an X-ray tube.
Background
The grid structure is a structure for controlling the on-off of rays, the current implementation mode for controlling the on-off of rays is to directly control the on-off of high voltage between the cathode and the anode, and secondly, the grid structure is designed to control the track of electrons of the electron gun, and the grid structure is more split type grid at present and mainly aims at realizing the technology of a flying focus point and the like. However, the conventional gate is difficult to assemble.
Disclosure of Invention
In order to solve the problems, the utility model provides a cathode assembly which can ensure the assembly precision of an X-ray tube, reduce the assembly difficulty and increase the reliability.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the present utility model provides a cathode assembly comprising:
a cathode base; and
a grid electrode connected with the cathode base;
the grid electrode is connected with the cathode base through a connecting component;
the cathode base is provided with a connecting hole which is formed along the vertical direction;
the connecting assembly comprises insulating pieces arranged on two sides of the connecting hole along the vertical direction and connecting pieces penetrating through the insulating pieces and the connecting hole;
the connector is configured to be non-contact with the cathode base and fixed in conjunction with the grid.
Preferably, the connecting piece comprises a head part and a rod part; the head is abutted with the insulating piece; the surface of the rod part is provided with threads; a threaded hole is formed in the grid electrode; the rod part is in threaded connection with the grid through a threaded hole.
Preferably, both insulating parts are welded and fixed with the cathode base.
Preferably, the insulating piece comprises an upper insulating piece and a lower insulating piece; the head is abutted and fixed with the upper end face of the upper insulating piece; the lower insulating piece is tightly fixed between the cathode base and the grid electrode.
Preferably, the cathode assembly further comprises a cathode head combined and fixed at one end of the cathode base; the cathode head is cylindrical, and the grid electrode is disc-shaped; the cathode head and the cathode base are enclosed to form a containing cavity; the grid electrode is positioned in the accommodating cavity; the cathode head and the grid are coaxially arranged.
Preferably, the cathode assembly further comprises a filament arranged on the cathode base through a lead rod; grid grooves corresponding to the positions of the filaments are formed on the grid electrodes.
Preferably, the grid electrode comprises a limiting groove for limiting the insulating piece; the limit groove and the threaded hole are coaxially arranged.
Preferably, the cathode assembly comprises two groups of symmetrically arranged connecting assemblies.
Preferably, the thickness dimension of the grid electrode ranges from 3 mm to 10mm.
The utility model also provides an X-ray tube comprising a cathode assembly as described above.
The beneficial effects of the utility model are as follows:
according to the utility model, the grid electrode is stably connected with the cathode base through the connecting component, meanwhile, the cathode base and the grid electrode are ensured not to be contacted, the grid electrode can be independently applied with high voltage, and interference with the pressure difference between the anode and the cathode is avoided; the cathode assembly is subjected to primary clamping processing, the processing precision is higher than that of secondary assembly, the grid assembly can be completed only through the connecting assembly, the assembly difficulty is low, and the reliability is high; the utility model can ensure that the distance between the grid electrode and the cathode is shortest and the size of the cathode is smallest under the condition of applying the same voltage, thereby indirectly increasing the distance between the cathode and the anode and increasing the pressure resistance of the X-ray tube.
Drawings
The following describes the embodiments of the present utility model in further detail with reference to the drawings.
Fig. 1 is a schematic view of the overall structure of the present utility model.
Fig. 2 is a schematic structural diagram of a gate according to the present utility model.
Detailed Description
Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present utility model unless it is specifically stated otherwise.
The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the utility model, its application, or uses.
Techniques and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate.
In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of exemplary embodiments may have different values.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
In order to solve the problem that the assembly difficulty of the grid electrode is high. The present utility model provides a cathode assembly, as shown in connection with fig. 1 to 2, in particular comprising: a cathode base 7; and a grid electrode 1 connected to the cathode base 7; the grid electrode 1 is connected with a cathode base 7 through a connecting component; a connecting hole which is formed along the vertical direction is formed on the cathode base 7; the connecting assembly comprises insulating pieces arranged on two sides of the connecting hole along the vertical direction and connecting pieces 6 penetrating through the insulating pieces and the connecting hole; the connecting piece 6 is configured to be fixed in combination with the grid 1 without contact with the cathode base 7; the grid electrode 1 is positioned at the cathode part of the vacuum tube, is connected with an insulating piece, is independently applied with voltage, and is not limited to be used for medical or industrial vacuum tubes, and is an integrated grid electrode. It will be appreciated that the insulator has a through hole formed therein for the connector 6 to pass therethrough, the stem portion of the connector 6 having an outer diameter smaller than the inner diameter of the connecting hole in order to ensure that the connector 6 is not in contact with the cathode base 7.
The primary function of the grid electrode is to realize on-off, control the size of a focus and have higher requirements on the precision of a grid electrode groove; the cathode assembly can be used for a static CT bulb tube, and the effect of 'rotation' can be realized by applying voltage to a grid electrode so as to control the on-off of the bulb tube and control the size of a focus; the device can also be used for rotating an anode CT bulb tube, and can also realize the control of the focal point of the bulb tube and the on-off control of emission; in practical tests, the utility model can realize rapid on-off of the grid voltage of 1.2kV under 160kV high voltage.
Further, regarding the connection manner of the connection member 6 and the gate 1, the connection member 6 includes a head portion and a stem portion; the head is abutted with the insulating piece; the surface of the rod part is provided with threads; a threaded hole is formed in the grid electrode 1; the rod part is in threaded connection with the grid electrode 1 through a threaded hole; by the above arrangement, the gate electrode 1 can be fixed and the gate voltage can be applied, so that the gate voltage can be conducted, and the connection strength between the gate electrode 1 and the cathode base 7 can be increased.
In the above embodiment, two insulating members are connected to the cathode base 7, and in order to ensure stability, a brazing manner may be adopted, or the insulating members may be tightly pressed by fastening the connecting members 6 to the grid 1.
In an alternative embodiment, both insulators are welded to the cathode base 7.
In another alternative embodiment, the insulator comprises an upper insulator 4 and a lower insulator 5; the head is abutted and fixed with the upper end face of the upper insulating piece 4; the upper insulator 4 is tightly fixed between the cathode base 7 and the head part; the lower insulator 5 is tightly fixed between the cathode base 7 and the grid electrode 1; the grid electrode 1 is isolated from the cathode base 7 through the upper insulating piece 4 and the lower insulating piece 5, so that independent grid voltage control is realized, and the grid voltage and the cathode high voltage are ensured not to interfere with each other; the insulating piece can be cylindrical, cuboid or special-shaped hexagonal, and then grooves or protrusions can be formed on the insulating piece according to actual conditions.
In one embodiment, the cathode assembly further comprises a cathode head 2 integrally fixed to the bottom end of the cathode base 7; the cathode head 2 and the cathode base 7 can be connected in a threaded or welding mode; the cathode head 2 is cylindrical, and the grid electrode 1 is disc-shaped; the cathode head 2 and the cathode base 7 are enclosed to form a containing cavity; the grid electrode 1 is positioned in the accommodating cavity; the cathode head 2 and the grid electrode 1 are coaxially arranged, and the consistency of the distance between the grid electrode 1 and the cathode head 2 can be ensured through the matching of the cathode head 2 and the grid electrode 1, so that the consistency of potential difference is ensured, and the possibility of ignition is reduced. The shape of the gate electrode 1 is determined by the shape of the cathode head 2 on the outer side thereof, and the shape of the gate electrode 1 is not limited to the disk shape described above, and the positions of the gate electrode 1 and the cathode head 2 may be ensured to be the same distance.
In order to ensure that the pressure difference between the grid electrode 1 and the cathode does not cause ignition of the cathode in a vacuum environment, in a specific embodiment, the cathode assembly further comprises a filament arranged on the cathode base 7 through a lead rod 3, and the lead rod 3 and the cathode base 7 are connected in a welding mode, so that independent voltage application to the filament can be realized; grid grooves 8 corresponding to the positions of the filaments are formed on the grid electrodes 1; the position tolerance of the grid groove 8 on the grid 1 is high, and the cathode short circuit can be prevented under the condition that the width of the grid groove 8 is minimum; further, the shape and size of the grid grooves 8 are not limited to square grooves, circular grooves, spindle grooves, and the like, according to the shape and design of the electron gun.
In one embodiment, the gate 1 includes a limiting slot 9 for limiting the insulating member; the limit groove 9 is coaxially arranged with the threaded hole. Specifically, a limiting groove 9 may be formed on a surface of one side of the gate 1, which contacts the lower insulator 5, and the shape of the limiting groove 9 may be determined according to the shape of the lower insulator 5, where the depth of the limiting groove 9 is 1-2mm, and the depth may be moderately increased or decreased, and the limiting groove 9 mainly serves to determine the relative position of the lower insulator 5 and the gate 1.
In a specific embodiment, the cathode assembly comprises two groups of symmetrically arranged connecting assemblies, so that two connecting pieces 6 are arranged, and the consistency of grid voltage can be ensured through short circuit.
In a specific embodiment, the thickness dimension of the grid electrode 1 in the vertical direction ranges from 3 mm to 10mm, and the specific dimension can be adjusted according to the electron gun dimension; the material of the grid electrode 1 is not limited to iron-nickel-cobalt porcelain sealing alloy, nonmagnetic stainless steel, molybdenum and other materials, and the material is specifically determined according to the expansion coefficients of metal and insulating parts.
In addition, the utility model also provides an X-ray tube comprising the cathode assembly. It will be appreciated that the X-ray tube mainly comprises a cathode assembly, an anode assembly and an insulating material (glass, ceramic, etc. are commonly used) between the cathode and anode, and the inside is a vacuum environment with the cathode assembly, the anode assembly and the insulating material. The working state is that an electron gun in the cathode assembly is electrified to work, electrons are released, high voltage is applied between the cathode and the anode, the electrons are driven to flow from the cathode to the anode, and the target surface of the anode is bombarded at a high speed to generate bremsstrahlung, so that X-rays are generated. The specific structure of the cathode assembly of the X-ray tube refers to the above embodiment, and since the X-ray tube adopts all the technical solutions of the above embodiment, at least has all the beneficial effects brought by the technical solutions of the above embodiment, and will not be described in detail herein.
In summary, the grid electrode and the cathode base are stably connected through the connecting component, and meanwhile, the cathode base and the grid electrode are ensured not to be contacted, so that the grid electrode can be independently applied with high voltage, and interference with the pressure difference between the cathode and the anode is avoided; the cathode assembly is subjected to primary clamping processing, the processing precision is higher than that of secondary assembly, the grid assembly can be completed only through the connecting assembly, the assembly difficulty is low, and the reliability is high; the utility model can ensure that the distance between the grid electrode and the cathode is shortest and the size of the cathode is smallest under the condition of applying the same voltage, thereby indirectly increasing the distance between the cathode and the anode and increasing the pressure resistance of the X-ray tube.
It should be understood that the foregoing examples of the present utility model are provided merely for clearly illustrating the present utility model and are not intended to limit the embodiments of the present utility model, and that various other changes and modifications may be made therein by one skilled in the art without departing from the spirit and scope of the present utility model as defined by the appended claims.
Claims (10)
1. A cathode assembly, comprising:
a cathode base; and
a grid electrode connected with the cathode base;
the grid electrode is connected with the cathode base through a connecting component;
the cathode base is provided with a connecting hole which is formed along the vertical direction;
the connecting assembly comprises insulating pieces arranged on two sides of the connecting hole along the vertical direction and connecting pieces penetrating through the insulating pieces and the connecting hole;
the connector is configured to be non-contact with the cathode base and fixed in conjunction with the grid.
2. The cathode assembly of claim 1, wherein the connector comprises a head portion and a stem portion; the head is abutted with the insulating piece; the surface of the rod part is provided with threads; a threaded hole is formed in the grid electrode; the rod part is in threaded connection with the grid through a threaded hole.
3. The cathode assembly of claim 1, wherein both insulators are welded to the cathode base.
4. The cathode assembly of claim 2, wherein the insulator comprises an upper insulator and a lower insulator; the head is abutted and fixed with the upper end face of the upper insulating piece; the lower insulating piece is tightly fixed between the cathode base and the grid electrode.
5. The cathode assembly of claim 1, further comprising a cathode head coupled to one end of the cathode base; the cathode head is cylindrical, and the grid electrode is disc-shaped; the cathode head and the cathode base are enclosed to form a containing cavity; the grid electrode is positioned in the accommodating cavity; the cathode head and the grid are coaxially arranged.
6. The cathode assembly of claim 1, further comprising a filament disposed on the cathode base by a lead stem; grid grooves corresponding to the positions of the filaments are formed on the grid electrodes.
7. The cathode assembly of claim 2, wherein the grid includes a limiting groove thereon for limiting the insulator; the limit groove and the threaded hole are coaxially arranged.
8. The cathode assembly of claim 1, wherein the cathode assembly comprises two sets of symmetrically disposed connection assemblies.
9. The cathode assembly of claim 1, wherein the gate electrode has a thickness dimension in the range of 3-10mm.
10. An X-ray tube comprising a cathode assembly according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321604176.9U CN219936989U (en) | 2023-06-21 | 2023-06-21 | Cathode assembly and X-ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321604176.9U CN219936989U (en) | 2023-06-21 | 2023-06-21 | Cathode assembly and X-ray tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219936989U true CN219936989U (en) | 2023-10-31 |
Family
ID=88499114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321604176.9U Active CN219936989U (en) | 2023-06-21 | 2023-06-21 | Cathode assembly and X-ray tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219936989U (en) |
-
2023
- 2023-06-21 CN CN202321604176.9U patent/CN219936989U/en active Active
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