CN219642773U - Ceramic stem - Google Patents
Ceramic stem Download PDFInfo
- Publication number
- CN219642773U CN219642773U CN202320936169.2U CN202320936169U CN219642773U CN 219642773 U CN219642773 U CN 219642773U CN 202320936169 U CN202320936169 U CN 202320936169U CN 219642773 U CN219642773 U CN 219642773U
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- CN
- China
- Prior art keywords
- ceramic
- insulating ceramic
- shell
- insulating
- stem according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000919 ceramic Substances 0.000 title claims abstract description 75
- 229910000833 kovar Inorganic materials 0.000 claims description 17
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims description 4
- 238000001465 metallisation Methods 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 3
- 230000005684 electric field Effects 0.000 abstract description 5
- 230000005611 electricity Effects 0.000 abstract description 5
- 230000003068 static effect Effects 0.000 abstract description 5
- 229910045601 alloy Inorganic materials 0.000 description 4
- 239000000956 alloy Substances 0.000 description 4
- 230000004907 flux Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- PCEXQRKSUSSDFT-UHFFFAOYSA-N [Mn].[Mo] Chemical compound [Mn].[Mo] PCEXQRKSUSSDFT-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 238000010183 spectrum analysis Methods 0.000 description 1
- 238000012916 structural analysis Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Electron Sources, Ion Sources (AREA)
Abstract
The utility model provides a ceramic core column, which comprises a voltage equalizing cover, insulating ceramics and a shell, wherein the voltage equalizing cover is arranged at the upper end of the insulating ceramics, the shell is connected at the lower end of the insulating ceramics, a lead is arranged on the insulating ceramics, and the voltage equalizing cover is completely isolated from the shell through the insulating ceramics, so that the problem that an electric field generated by static electricity of the shell affects internal electron emission is solved.
Description
Technical Field
The utility model belongs to the technical field of X-ray tube component structures, and particularly relates to a ceramic core column.
Background
The X-ray tube is a vacuum diode working under high voltage and is widely applied to medical diagnosis, medical treatment, nondestructive detection of materials, structural analysis, spectral analysis, negative film exposure and the like, and the ceramic stem is an important component of the X-ray tube and is a part of a cathode of the X-ray tube; the ceramic core column plays roles of cathode insulation, cathode shielding, vacuum degree maintenance, cathode external electric connection and cathode connection with the whole tube shell.
The insulating ceramics in the existing ceramic core column do not completely isolate the voltage equalizing cover from the shell, and the problem that an electric field generated by static electricity of the shell affects the emission of internal electrons may exist.
Disclosure of Invention
The utility model aims to provide a ceramic stem to solve the problem that an electric field generated by static electricity of a shell of the ceramic stem in the prior art affects internal electron emission.
The utility model provides a pottery stem, includes voltage-sharing cover, insulating ceramic and shell, voltage-sharing cover is connected with insulating ceramic's upper end, and the shell is connected with insulating ceramic's lower extreme, keeps apart each other between voltage-sharing cover and the shell, installs the lead wire on the insulating ceramic.
Further, a square window is formed in the pressure equalizing cover.
Further, the insulating ceramic has a concentric cylinder structure with two different diameters.
Furthermore, a plurality of through holes are formed in the insulating ceramic, a boss (6) is arranged on the bottom surface of the insulating ceramic, and the lead wires are arranged in the through holes.
Further, the lead and the bottom surface of the insulating ceramic are sealed by a kovar cap.
Further, the kovar cap is of an inverted T-shaped structure, and a through hole for a lead to pass through is formed in the kovar cap.
Further, the shell is of a convex structure with two open ends.
Further, the insulating ceramic is made of 90% -95% of alumina ceramic, and a metallization layer is coated on the surface of the insulating ceramic.
Furthermore, the pressure equalizing cover and the shell are made of kovar alloy.
Furthermore, the voltage equalizing cover and the shell are connected with the insulating ceramic in a welding mode.
Compared with the prior art, the utility model has the following beneficial technical effects:
the utility model provides a ceramic core column, which comprises a voltage equalizing cover, insulating ceramics and a shell, wherein the voltage equalizing cover is arranged at the upper end of the insulating ceramics, the shell is connected at the lower end of the insulating ceramics, a lead is arranged on the insulating ceramics, and the voltage equalizing cover is completely isolated from the shell through the insulating ceramics, so that the problem that an electric field generated by static electricity of the shell affects internal electron emission is solved.
Preferably, the pressure equalizing cover is provided with a square window, so that the assembly of parts such as filaments in the ceramic core column is facilitated.
Preferably, the lead is welded with the insulating ceramic through the kovar cap, so that the reliability is higher and the air tightness is better.
Drawings
Fig. 1 is a diagram of a ceramic stem structure in an embodiment of the utility model.
Fig. 2 is a cross-sectional view of a ceramic stem insulating ceramic in an embodiment of the utility model.
Fig. 3 is a top view of a ceramic stem insulating ceramic in an embodiment of the utility model.
In the figure, 1, a pressure equalizing cover; 2. insulating ceramics; 3. a housing; 4. a lead wire; 5. kovar cap; 6. a boss.
Detailed Description
In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
As shown in fig. 1, 2 and 3, a ceramic stem comprises a voltage equalizing cover 1, an insulating ceramic 2, a shell 3 and a lead 4, wherein the voltage equalizing cover 1 is arranged at the upper end of the insulating ceramic 2, the shell 3 is connected at the lower end of the insulating ceramic 2, and the lead 4 is arranged on the insulating ceramic 2, and the voltage equalizing cover 1 and the shell 3 are completely isolated through the insulating ceramic 2, so that the problem that an electric field generated by static electricity of the shell 3 possibly affects electron emission inside the voltage equalizing cover 1 is solved.
Specifically, the insulating ceramic 2 is composed of two concentric cylinders with different diameters, a through hole for installing the lead 4 is formed in the insulating ceramic 2, a boss 6 structure, namely a convex cylinder structure, is arranged at the position of the through hole at the bottom end face of the insulating ceramic 2, the through hole is formed in the middle position of the through hole, in addition, a metallization layer is coated on the outer surface of the insulating ceramic 2, the metallization layer is made of molybdenum-manganese, and the insulating ceramic 2 is made of 90% -95% alumina ceramic.
The pressure equalizing cover 1 is of a cylindrical structure, is made of kovar alloy, is provided with two rectangular windows on the side face of the pressure equalizing cover 1, and is subjected to chamfering treatment at four corners of the windows, and the inner wall of the pressure equalizing cover 1 is welded on the outer wall of the small-diameter cylinder at the upper end of the insulating ceramic 2 through welding flux.
The shell 3 is of a convex structure with two open ends, the material is kovar alloy, and the inner wall of a small cylinder at the upper part of the shell 3 is welded on the outer wall of a large-diameter cylinder at the lower end of the insulating ceramic 2 through welding flux.
The lead 4 and the kovar cap 5 are made of kovar alloy, the lead 4 is in a needle-shaped structure, the kovar cap 5 is in an inverted T-shaped structure, a through hole for the lead 4 to pass through is formed in the middle of the kovar cap, and specifically, the kovar cap 5 welds the lead 4 with the boss 6 on the insulating ceramic 2 through solder.
The utility model also protects an X-ray tube using the ceramic core column with the structure as a cathode.
The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model.
Claims (10)
1. The utility model provides a pottery stem, its characterized in that includes voltage-sharing cover (1), insulating ceramic (2) and shell (3), voltage-sharing cover (1) is connected with insulating ceramic (2)'s upper end, and shell (3) are connected with insulating ceramic (2)'s lower extreme, keep apart each other between voltage-sharing cover (1) and shell (3), install lead wire (4) on insulating ceramic (2).
2. A ceramic stem according to claim 1, wherein the pressure equalizing cover (1) is provided with square windows.
3. A ceramic stem according to claim 1, characterized in that the insulating ceramic (2) is of two concentric cylinder structures of different diameters.
4. A ceramic stem according to claim 1, wherein the insulating ceramic (2) is provided with a plurality of through holes, the bottom surface of the insulating ceramic (2) is provided with a boss (6), and the lead wires (4) are mounted in the through holes.
5. A ceramic stem according to claim 4, wherein the lead (4) is sealed to the bottom surface of the insulating ceramic (2) by a kovar cap (5).
6. The ceramic stem according to claim 5, wherein the kovar cap (5) has an inverted T-shaped structure, and a through hole for the lead (4) to pass through is formed in the kovar cap (5).
7. A ceramic stem according to claim 1, wherein the housing (3) has a convex structure with two open ends.
8. The ceramic stem according to claim 1, wherein the insulating ceramic (2) is 90% -95% alumina ceramic, and the surface of the insulating ceramic (2) is coated with a metallization layer.
9. Ceramic stem according to claim 1, characterized in that the pressure equalizing cover (1) and the housing (3) are both made of kovar.
10. A ceramic stem according to claim 1, characterized in that the pressure equalizing cover (1) and the casing (3) are both connected to the insulating ceramic (2) by means of welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320936169.2U CN219642773U (en) | 2023-04-23 | 2023-04-23 | Ceramic stem |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320936169.2U CN219642773U (en) | 2023-04-23 | 2023-04-23 | Ceramic stem |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219642773U true CN219642773U (en) | 2023-09-05 |
Family
ID=87816989
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320936169.2U Active CN219642773U (en) | 2023-04-23 | 2023-04-23 | Ceramic stem |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219642773U (en) |
-
2023
- 2023-04-23 CN CN202320936169.2U patent/CN219642773U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |