CN109623061B - Anode brazing structure - Google Patents
Anode brazing structure Download PDFInfo
- Publication number
- CN109623061B CN109623061B CN201811639574.8A CN201811639574A CN109623061B CN 109623061 B CN109623061 B CN 109623061B CN 201811639574 A CN201811639574 A CN 201811639574A CN 109623061 B CN109623061 B CN 109623061B
- Authority
- CN
- China
- Prior art keywords
- anode
- brazing
- positioning step
- brazing structure
- solder
- 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.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K1/00—Soldering, e.g. brazing, or unsoldering
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
- Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
Abstract
The invention provides an anode brazing structure, which comprises an anode cover and a cast target, wherein the end surface of the cast target body part close to an extension part is hermetically combined with a first positioning step of the anode cover through brazing flat seal; a gap surrounding a circle is formed between the outer wall of the cast target body part close to the end part of the extension part and the inner wall of the anode cover close to the outer edge of the first positioning step of the anode cover. In the anode brazing structure, neither the brazing surface nor the solder is directly exposed to the vacuum chamber; in subsequent high-temperature baking, the solder at the welding surface can firstly diffuse to the gap connected with the welding surface after being evaporated, cannot reach the vacuum cavity, cannot form an evapotranspiration area on the glass shell, and ensures the insulating property and the voltage resistance of the glass shell. In addition, the anode brazing structure provided by the invention is stable in assembly, is beneficial to vacuum pumping, and ensures service safety and service life.
Description
Technical Field
The invention relates to the technical field of vacuum devices, in particular to an anode brazing structure.
Background
The electric vacuum device is a component with a complex structure formed by connecting a plurality of materials through a welding method, and the requirements of the electric vacuum device on maintaining high vacuum for a long time and brazing the device are generally carried out in a hydrogen furnace, so that the requirements of various brazing materials and devices are high.
In the practical application process of the anode brazing structure with the glass shell, the anode cover and the cast target are made of oxygen-free copper, the melting point of the oxygen-free copper is 1083 ℃, the softening point of glass is about 800 ℃, and the subsequent processing and baking temperature of the anode is 650 ℃. In order to ensure successful soldering, the melting point of the solder is selected to be at least about 60 ℃ lower than the melting point of the solder metal and at least about 100 ℃ higher than the device baking temperature, but not higher than the melting point of the glass, so that the melting point range of the solder is very narrow. Therefore, avoiding solder evaporation during high temperature baking by selecting a higher melting point solder is very limited while increasing cost.
In the prior art, an anode cover and a casting target are assembled together in a lap joint mode, a welding material ring is placed on a contact surface, flat sealing mode welding is adopted, when a workpiece and the welding material are heated to a temperature slightly higher than the melting point of the welding material, the welding material is melted, the anode cover and the casting target cannot be melted, the anode cover and the casting target are sucked into and filled in a fit gap by virtue of capillary action, liquid welding material is mutually diffused and dissolved with the anode cover and the casting target respectively, a brazing joint is formed after condensation, and the liquid welding material is very easy to diffuse to the surfaces of the anode cover and the casting target through the contact surface. In addition, when the subsequent process (such as exhausting) of the device is carried out for high-temperature baking, the evaporable temperature of the solder is reduced along with the increase of the vacuum degree; and as the temperature increases, the saturated vapor pressure of the solder increases, and more solder is evaporated. In the prior art, a welding line is directly exposed in a vacuum cavity in a glass shell, and after being heated, the welding line is directly evaporated outwards and is deposited on the nearby glass shell to form an annular evaporation area, so that the insulating property and the pressure resistance of the glass shell are poor.
Therefore, it is desirable to provide an anode brazing structure capable of solving the above problems.
Disclosure of Invention
The invention aims to provide a novel anode brazing structure, which adopts the following technical scheme:
an anode brazing structure comprising:
the anode cover is provided with a first positioning step which is inwards sunken at one end;
the casting target comprises a body part and an extension part extending from the body part; wherein
The end surface of the body part close to the extension part is hermetically combined with the first positioning step in a brazing flat sealing mode;
a gap surrounding one circle is formed between the outer wall of the body part close to the end part of the extension part and the inner wall of the anode cover close to the outer edge of the first positioning step.
Preferably, the gap extends for a length of 1-5mm in the axial direction.
Preferably, the gap has a width in the radial direction of 0.05-0.2 mm.
Preferably, the anode brazing structure further comprises a metal cover and a glass bulb; one end of the metal cover is hermetically combined with the glass envelope in a heat-sealing manner.
Preferably, an outer wall of an end of the body portion away from the extension portion is formed with a second positioning step.
Preferably, one end of the metal cover far away from the glass bulb is hermetically combined with the second positioning step in a brazing flat sealing mode.
Preferably, the metal cover is made of kovar metal.
Preferably, the first positioning step surface is formed with a solder groove in a circumferential direction.
Preferably, the solder grooves are formed in a plurality of concentric circles.
Preferably, an annular solder groove is formed on the inner wall surface of the anode cover near the outer edge of the first positioning step.
The invention has the following beneficial effects:
the present invention provides an anode brazing structure in which the outer edges of the joining faces of an anode cup and a cast target are not directly exposed to a vacuum chamber, and a gap for collecting solder after evaporation is formed in the vicinity of the joining faces. In the brazing process, when the solder placed on the welding surface is melted and diffused under the capillary action, the solder cannot be directly diffused to the outer surface of the anode cover or the casting target, and the welding surface and the solder cannot be directly exposed in the vacuum cavity; when high-temperature baking is carried out in the subsequent process, because the surface of the workpiece in contact with the vacuum cavity is free of solder, and the solder at the welding surface can be firstly diffused to the gap connected with the welding surface after being evaporated, the solder cannot reach the vacuum cavity, and an evaporation area cannot be formed on the glass shell, so that the insulating property and the pressure resistance of the glass shell are ensured, and the service safety and the service life of the anode brazing structure with the glass shell are improved.
On the other hand, in the assembly process of the anode cover and the cast target, the anode cover and the cast target are provided with three contact surfaces, the contact surfaces are large, and the extension part of the cast target is inserted into the accommodating cavity of the anode cover and is in nested fit, so that the assembly of the anode cover and the cast target is very stable; and in the assembling process, the three contact surfaces are communicated with each other, but an air cavity is not formed, so that the vacuum pumping process is facilitated.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a schematic view of an anode brazing structure provided by the invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be considered a part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
In the prior art, an anode cover and a cast target are brazed and welded in a flat sealing mode, and a welding seam is positioned at the joint of the anode cover and the cast target and is directly exposed in a vacuum cavity. During the welding process, the liquid solder is easy to diffuse outwards from the contact surface and is attached to the surfaces of the anode cover and the cast target after being condensed. When high-temperature baking is carried out in the subsequent process, the solder on the surfaces of the anode cover and the casting target and the solder in the welding seam are directly evaporated into the vacuum cavity along with the improvement of the temperature and the vacuum degree in the vacuum cavity, and then the solder is deposited on a glass bulb with relatively low temperature, and an annular evaporation area is formed on the glass bulb, so that the insulating property and the pressure resistance of the glass bulb are greatly influenced.
The present invention provides an anode brazing structure, as shown in fig. 1, including:
the anode cover comprises an anode cover 1, wherein one end of the anode cover 1 is provided with a first positioning step 11 which is inwards concave;
a cast target 2, wherein the cast target 2 comprises a main body part 21 and an extension part 22 extending from the main body part 21; wherein
The end surface of the main body 21 close to the extension part 22 is hermetically combined with the first positioning step 11 in a brazing flat sealing mode;
the outer wall of the body part 21 near the end of the extension part 22 and the inner wall of the anode cover 1 near the outer edge of the first positioning step 11 form a gap 3 around the circumference.
It should be noted that, the anode cover 1 includes an accommodating cavity extending along the axial direction, the end surface of the body portion 21 of the cast target 2 close to the extension portion 22 is hermetically combined with the first positioning step 11 in a brazing flat sealing manner, the extension portion 22 is inserted into the accommodating cavity of the anode cover 1, and the outer wall of the body portion 21 close to the end of the extension portion 22 is sleeved on the inner wall of the anode cover 1 close to the outer edge of the first positioning step 11. Because the first positioning step 11 is formed by one end of the anode cover 1 being sunken inwards, and surrounds the inner wall of the anode cover 1 for one circle, the outer line of the first positioning step does not extend to the outer wall of the anode cover 1, after the first positioning step is in braze welding flat sealing airtight combination with the end surface of the body part 21 close to the extension part 22, the outer edge of the welding surface is not directly exposed to the vacuum cavity, namely, a welding seam cannot be seen outside the anode cover 1. The outer wall of the main body 21 near the end of the extension 22 is communicated with the outer edge of the first positioning step 11, namely the outer edge of the welding surface, so that a gap 3 surrounding the circumference is formed between the outer wall of the main body and the inner wall of the anode cover 1 near the outer edge of the first positioning step 11, and the extending direction of the gap 3 is perpendicular to the welding surface.
The welding surface formed by the first positioning step 11 of the anode cover 1 and the end surface of the casting target 2 body part 21 close to the extension part 22 is not directly exposed in the vacuum cavity, and when the solder placed on the welding surface is molten and diffused under the capillary action, the solder is not directly diffused to the outer surface of the anode cover 1 or the casting target 2, and the solder is not directly exposed in the vacuum cavity. In the subsequent process of the device, when high-temperature baking is carried out, the solder can be evaporated away from the welding surface due to the increase of the vacuum degree and the temperature. In the present invention, since the solder is not directly exposed to the vacuum chamber, the solder does not evaporate to the vacuum chamber after leaving the soldering surface, but diffuses to the gap 3 connected to the soldering surface. Therefore, in the invention, the solder can not directly reach the vacuum cavity due to evaporation, and further can not be deposited on the glass bulb 5, and an annular evaporation area can not be formed, thereby effectively preventing the solder from having adverse effects on the insulation and pressure resistance of the glass bulb 5, and further improving the service safety and service life of the anode brazing structure with the glass bulb 5.
On the other hand, in the assembly process of the anode cover 1 and the casting target 2, the anode cover 1 and the casting target 2 have three contact surfaces, the contact surfaces are large, and the extension part 22 of the casting target 2 is inserted into the accommodating cavity of the anode cover 1 and is in nested fit, so that the assembly of the anode cover 1 and the casting target 2 is very stable. In the assembling process, the three contact surfaces are communicated with each other, but an air cavity cannot be formed, so that the vacuum pumping process is facilitated.
In a preferred embodiment, said gap 3 has an extension in the axial direction of 1-5mm and a width in the radial direction of 0.05-0.2 mm. This gap 3 size does not affect the stability of the assembly of the two while providing a sufficient containment chamber for the evaporated solder and is easy to achieve technologically.
Further, for example, the extension length of the gap 3 in the axial direction may also be, but not limited to, 1.2-4.5mm, 1.4-4mm, 1.6-3.5mm, 1.8-3 mm, or 2-2.5mm, etc.; the width in the radial direction may be, but is not limited to, 0.06-0.18mm, 0.07-0.16mm, 0.08-0.14mm, 0.09-0.12 mm, or 0.1-0.11mm, etc.
In a specific embodiment, the anode brazing structure further comprises a metal cover 4 and a glass bulb 5; one end of the metal cover 4 is hermetically and thermally sealed and combined with the glass bulb 5, and the other end is hermetically and horizontally sealed and combined with the cast target 2 through a second positioning step 211 by brazing, wherein the second positioning step 211 is arranged on the outer wall of one end of the body part 21 far away from the extension part 22. In a preferred embodiment, the metal cover 4 is made of kovar. This is because kovar has a coefficient of thermal expansion close to that of glass in the temperature range from room temperature to below the upper annealing temperature limit of glass, and can be used as a transition metal for glass-to-metal bonding.
In a preferred embodiment, the first positioning step 11 surface is formed with solder grooves in the circumferential direction, and more preferably, the solder grooves are formed in a plurality of concentric circles. During the high-temperature baking process in the soldering process or the subsequent process of the device, the solder on the surface of the first positioning step 11 is melted into liquid and flows under the capillary action, and the solder groove can provide a flow guiding groove for the flow of the solder to prevent the solder from exceeding the outer edge of the first positioning step 11. The shape of the solder groove may be rectangular, circular arc, or may be a plurality of concentric circles, which is not limited in the present invention.
In order to prevent the evaporated solder from flowing directly to the surface of the anode cover 1 or the cast target 2 along the axial direction of the gap 3 from the outside of the first positioning step, in a preferred embodiment, an annular solder groove may be formed on the surface of the inner wall of the anode cover 1 near the outside edge of the first positioning step 11 to guide the flow of the solder, thereby further ensuring that the solder does not evaporate to the inner wall of the glass envelope 5 and maintaining the pressure resistance and the insulation performance of the glass envelope 5.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (10)
1. An anode brazing structure, comprising:
one end of the anode cover is inwards sunken to form a first positioning step;
a cast target including a body portion and an extension extending from the body portion; wherein
The end surface of the body part close to the extension part is hermetically combined with the first positioning step in a brazing flat sealing mode;
a gap surrounding one circle is formed between the outer wall of the body part close to the end part of the extension part and the inner wall of the anode cover close to the outer edge of the first positioning step;
the outer wall of the body part near the end part of the extension part is a non-welding surface of the brazing flat seal.
2. The anode brazing structure according to claim 1, wherein the gap extends in the axial direction by 1 to 5 mm.
3. The anode brazing structure according to claim 2, wherein the width of the gap in the radial direction is 0.05-0.2 mm.
4. The anode brazing structure according to claim 1, further comprising a metal cap and a glass envelope; one end of the metal cover is hermetically combined with the glass envelope in a heat-sealing manner.
5. The anode brazing structure according to claim 4, wherein an outer wall of an end of the body portion remote from the extension portion is formed with a second positioning step.
6. The anode brazing structure according to claim 5, wherein the end of the metal cap remote from the glass envelope is hermetically joined to the second positioning step by brazing.
7. The anodic brazing structure according to any one of claims 4 to 6, wherein the metal cap is made of kovar.
8. The anode brazing structure according to claim 1, wherein the first positioning step surface is formed with a solder groove in a circumferential direction.
9. The anodic brazing structure according to claim 8, wherein the solder groove is formed in a plurality of concentric circles.
10. The anode brazing structure according to claim 1, wherein an annular solder groove is formed in the surface of the inner wall of the anode casing in the vicinity of the outer edge of the first positioning step.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811639574.8A CN109623061B (en) | 2018-12-29 | 2018-12-29 | Anode brazing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811639574.8A CN109623061B (en) | 2018-12-29 | 2018-12-29 | Anode brazing structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109623061A CN109623061A (en) | 2019-04-16 |
| CN109623061B true CN109623061B (en) | 2021-07-06 |
Family
ID=66054624
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811639574.8A Active CN109623061B (en) | 2018-12-29 | 2018-12-29 | Anode brazing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109623061B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114334584B (en) * | 2021-12-10 | 2024-05-24 | 上海科颐维电子科技有限公司 | Be used for X-ray tube positive pole welding set |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5178316A (en) * | 1992-02-07 | 1993-01-12 | General Electric Company | Brazed X-ray tube anode |
| JPH11149891A (en) * | 1997-11-13 | 1999-06-02 | Hitachi Medical Corp | Fixed anode x-ray tube apparatus |
| US6829329B1 (en) * | 2002-01-17 | 2004-12-07 | Varian Medical Systems Technologies, Inc. | Target for a stationary anode in an x-ray tube |
| CN201720340U (en) * | 2010-07-19 | 2011-01-26 | 杭州凯龙医疗器械有限公司 | X-ray anode cap forming die device |
| US20170076903A1 (en) * | 2015-09-14 | 2017-03-16 | Michael Turner | X-ray tube |
| CN108321071A (en) * | 2018-02-05 | 2018-07-24 | 公安部第研究所 | A kind of hollow structure X-ray tube |
| CN108109893A (en) * | 2018-02-05 | 2018-06-01 | 公安部第研究所 | One kind can cut down stem grid-controlled X-ray tube |
-
2018
- 2018-12-29 CN CN201811639574.8A patent/CN109623061B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| X射线管中95Al_2O_3和Kovar合金的活性钎焊;陆善平 等;《焊接》;19971231(第10期);2-5 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109623061A (en) | 2019-04-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8456001B2 (en) | Pressure-contact semiconductor device | |
| CN109643773A (en) | Integrated electrical feedthrough component for battery case wall | |
| WO1999028942A1 (en) | X-ray tube | |
| JP2005302368A (en) | Transmitting x-ray tube and its manufacturing method | |
| TWI584545B (en) | Compression sealing type airtight terminal and compression seal type airtight terminal manufacturing method | |
| CN103109337A (en) | Electrochemical device | |
| CN109623061B (en) | Anode brazing structure | |
| JP2005183356A (en) | Sealing technique for hermetical lamp having uniquely sealed component and lamp | |
| US2644907A (en) | Electron tube | |
| US2402029A (en) | Electron device and method of manufacture | |
| US2446269A (en) | Electrode mounting structure for electron tubes | |
| US2880349A (en) | Ceramic electron tube | |
| US6015325A (en) | Method for manufacturing transmission type X-ray tube | |
| US2023931A (en) | Method of mounting tubular electrodes inside the vessels of space discharge devices | |
| KR20080017419A (en) | Electrode system for a lamp | |
| CN107380740B (en) | A kind of efficient cool-bag manufacturing method and its cool-bag of manufacture | |
| CN116978762B (en) | Pocket welding method for anode assembly | |
| US4853596A (en) | Flash discharge lamp with sintered cathode member | |
| US2794933A (en) | Ceramic tetrode | |
| JP6809989B2 (en) | Airtight terminal and its manufacturing method | |
| US2931935A (en) | Electric discharge device | |
| US3953757A (en) | Solder sealed light bulb | |
| US3300673A (en) | Tolerance compensating electrode support structure and method of manufacturing same | |
| JPS6321090Y2 (en) | ||
| JPS608271Y2 (en) | solar heat collector tube |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20230625 Address after: No. 1918, 16th floor, scientific research building, No. 13 Jiuxianqiao Road, Chaoyang District, Beijing 100015 Patentee after: CETC Ruishi Technology (Beijing) Co.,Ltd. Address before: 13 Jiuxianqiao Road, Chaoyang District, Beijing 100015 Patentee before: BEIJING VACUUM ELECTONICS Research Institute |
|
| TR01 | Transfer of patent right |