CN213958900U - Directly-heated cathode emitter - Google Patents
Directly-heated cathode emitter Download PDFInfo
- Publication number
- CN213958900U CN213958900U CN202120257123.9U CN202120257123U CN213958900U CN 213958900 U CN213958900 U CN 213958900U CN 202120257123 U CN202120257123 U CN 202120257123U CN 213958900 U CN213958900 U CN 213958900U
- Authority
- CN
- China
- Prior art keywords
- emitter
- spiral structure
- cathode
- direct heating
- tail end
- 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
Landscapes
- Electron Sources, Ion Sources (AREA)
Abstract
The utility model discloses a direct-heating cathode emitter, which comprises a single spiral structure, an emitter initial end and an emitter end; the single-spiral structure is independently arranged in the cavity of the hollow cathode; the single spiral structure is connected between the starting end and the tail end of the emitter; the cathode emitter fixes the spatial position of the spiral structure through the starting end and the tail end of the emitter. The upper end of the single spiral structure is connected with the starting end of the emitter, and the lower end of the single spiral structure is connected with the tail end of the emitter; the starting end of the emitter comprises a structural section which is led out downwards from the upper end of the single-spiral structure, and the extending direction of the structural section is parallel to the axis of the single-spiral structure. The utility model discloses a mode at emitter top and emitter end-to-end connection extraction electrode directly heats the emitter, replaces among the prior art to carry out the mode of indirect heating to the emitter through heating the thermion, has improved hollow cathode's heating efficiency.
Description
Technical Field
The utility model relates to a cathode emitter, concretely relates to structure of directly-heated cathode emitter.
Background
The hollow cathode is widely applied to the fields of plasma sources, plasma welding, plasma cutting, plasma cladding, plasma spraying, plasma injection, plasma coating, plasma ignition and the like, and is an indispensable core device in the technical fields. In military, the cathode is the heart of various vacuum microwave electronic devices, vacuum low-light night vision devices, vacuum infrared imaging devices and vacuum ultraviolet imaging devices. Meanwhile, in industrial and medical devices, an X-ray tube, an image intensifier, an accelerator tube, and a display, which use a cathode as an emission source, play a very important role. In scientific research, cathodes are also indispensable key components in various analytical instruments, electron beam processing, electron beam exposure, electron beam evaporation and other equipment.
The cathode needs to be carried out at high temperature when working, so that the heating power of the hollow cathode needs to be reduced as much as possible under the condition of meeting the working condition of the cathode, the heating efficiency is improved, the heat energy loss is reduced, the material evaporation is reduced, and the service life of the hollow cathode is prolonged. The performance of the existing hollow cathode has a space for continuously improving.
SUMMERY OF THE UTILITY MODEL
The utility model provides a directly-heated cathode emitter heats the emitter through directly, has improved hollow cathode's heating efficiency. The method is realized by the following technical scheme:
a direct-heating cathode emitter comprises a single spiral structure, an emitter initial end and an emitter tail end;
the single-spiral structure is independently arranged in the cavity of the hollow cathode;
the single spiral structure is connected between the starting end and the tail end of the emitter;
the cathode emitter fixes the spatial position of the spiral structure through the starting end and the tail end of the emitter.
The common thermionic structure in the existing hollow cathode is cancelled, the emitter is directly heated in a mode of connecting the leading-out electrode at the starting end of the emitter and the tail end of the emitter, the mode of indirectly heating the emitter by heating the thermions in the prior art is replaced, the heating efficiency of the hollow cathode is improved, the emitting area of the emitter in the cathode cavity can be increased by designing the emitter into a spiral structure, and the electron emission capability of the cathode is further improved.
On the basis of the scheme, the method further comprises the following steps:
the upper end of the single spiral structure is connected with the starting end of the emitter, and the lower end of the single spiral structure is connected with the tail end of the emitter;
the starting end of the emitter comprises a structural section which is led out downwards from the upper end of the single-spiral structure, and the extending direction of the structural section is parallel to the axis of the single-spiral structure.
On the basis of the scheme, the method further comprises the following steps:
the starting end and the tail end of the emitter are respectively connected with an extraction electrode.
On the basis of the scheme, the method further comprises the following steps:
the two leading-out electrodes penetrate through the insulating seat and are clamped on the insulating seat.
On the basis of the scheme, the method further comprises the following steps:
the two leading-out electrodes are clamped and brazed on the insulating base.
On the basis of the scheme, the method further comprises the following steps:
a heat shielding plate is arranged below the spiral structure,
the starting end and the tail end of the emitter penetrate through the heat shielding plate and are respectively connected with a lead-out electrode.
On the basis of the scheme, the method further comprises the following steps:
the heat shield plate and the insulating base are made of alumina.
On the basis of the scheme, the method further comprises the following steps:
and the initial end and the tail end of the emitter are respectively welded with an extraction electrode in an embedded mode.
On the basis of the scheme, the method further comprises the following steps:
the welding mode is laser welding.
On the basis of the scheme, the method further comprises the following steps:
the directly-heated cathode emitter is made of barium tungsten.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
1. the utility model discloses well cancellation is the thermionic structure commonly used in current hollow cathode, through the mode of drawing forth the electrode at emitter top and emitter end-to-end connection, directly heats the emitter, replaces among the prior art to carry out the mode that the indirect heating was carried out to the emitter through heating the thermionic, has improved hollow cathode's heating efficiency.
2. The utility model discloses a with the emitter design for single helical structure, can increase the emission area of emitter in the negative pole cavity, further improved hollow cathode's electron emission ability.
3. The cathode emitter generates heat energy by itself, so that the heating time of the cathode is greatly reduced, and the starting speed of the hollow cathode is improved.
Drawings
A further understanding of the embodiments of the present invention may be obtained by reference to the following claims and the following description of the preferred embodiments of the invention, which are incorporated in and constitute a part of this specification. Individual features of the different embodiments shown in the figures may be combined in any desired manner in this case without going beyond the scope of the invention. In the drawings:
FIG. 1 is a schematic structural view of example 1;
fig. 2 is a schematic structural view of embodiment 2.
Description of reference numerals: 1-single helix structure, 2-cathode top, 3-first heat shield cylinder, 4-second heat shield cylinder, 5-third heat shield cylinder, 6-fixing ring, 7-heat shield plate, 8-transition cylinder, 9-first heat shield cylinder, 10-second heat shield cylinder, 11-support cylinder, 12-insulating seat, 13-leading-out electrode, 14-air inlet pipe, 15-emitter starting end and 16-emitter end.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the following examples and drawings, and the exemplary embodiments and descriptions thereof of the present invention are only used for explaining the present invention, and are not intended as limitations of the present invention.
Example 1:
as shown in fig. 1, in the present embodiment, a direct heating cathode emitter improves the heating efficiency of a hollow cathode by directly heating the emitter. The method is realized by the following technical scheme:
a direct-heating cathode emitter comprises a single-helix structure 1, an emitter start end 15 and an emitter end 16; the single-spiral structure 1 is independently arranged in the cavity of the hollow cathode; the single helix structure 1 is connected between an emitter start 15 and an emitter end 16; the cathode emitter fixes the spatial position of the spiral structure through an emitter starting end 15 and an emitter tail end 16.
Preferably, in order to increase the heat-generating area of the emitter in the hollow cathode cavity, the upper end of the single-helix structure 1 is connected with the emitter starting end 15, and the lower end is connected with the emitter tail end 16; the emitter start 15 comprises a structural section which is led out downwards from the upper end of the single-helix structure 1, and the extension direction of the structural section is parallel to the axis of the single-helix structure 1.
Preferably, a heat shielding plate 7 is arranged below the spiral structure, the heat shielding plate 7 is made of alumina, and the emitter starting end 15 and the emitter tail end 16 are respectively connected with one extraction electrode 13 after penetrating through the heat shielding plate 7.
Preferably, the emitter starting end 15 and the emitter tail end 16 are respectively welded with one extraction electrode 13 in an embedded manner; the welding mode is laser welding.
Preferably, the two extraction electrodes 13 penetrate through the insulating base 12, and are clamped and brazed on the insulating base 12 to provide a support function for the cathode emitter.
Preferably, the heat shield plate 7 and the insulating base 12 are made of alumina.
Preferably, the direct heating cathode emitter is made of barium tungsten or lanthanum hexaboride.
In order to further realize the purpose of the utility model, the utility model discloses still put forward the second embodiment.
Example 2:
as shown in fig. 2, a directly heated hollow cathode, comprising the directly heated cathode emitter of embodiment 1, in order to reduce the heat loss of the side heat radiation and heat conduction, the periphery of the spiral structure 1 is provided with three heat shielding cylinders, which sequentially comprises a first heat shielding cylinder 3, a second heat shielding cylinder 4 and a third heat shielding cylinder 5 from inside to outside, the outer diameter of the first heat shielding cylinder 3 is smaller than the inner diameter of the second heat shielding cylinder 4, and the outer diameter of the second heat shielding cylinder 4 is smaller than the inner diameter of the third heat shielding cylinder 5; the first heat shield 3 and the second heat shield 4 are made of molybdenum metal, and the third heat shield 5 is made of alumina ceramic.
Preferably, the second heat shield 4 radially limits the heat shield plate 7, and the first heat shield 3 axially limits the heat shield plate 7.
Preferably, a first heat shield 9 and a second heat shield 10 are further sequentially disposed below the heat shield plate 7, and the first heat shield 9 and the second heat shield 10 are made of tantalum metal.
Preferably, the cathode top 2 is arranged above the spiral structure 1, the third heat shielding cylinder 5 radially limits the cathode top 2, and the first heat shielding cylinder 3 axially limits the cathode top 2; the cathode top 2 is made of metal tungsten.
Preferably, the direct heating type hollow cathode comprises an air inlet pipe 14, and the air inlet pipe 14 penetrates through the insulating base 12 and is welded on the insulating base 12 between the two extraction electrodes 13.
Preferably, the outer layer of the third heat shielding barrel 5 is also provided with a fixing ring 6 made of metal tantalum, the fixing ring 6 is welded below the metal tantalum, the transition barrel 8 is welded on a support barrel 11 made of kovar, and the support barrel 11 is brazed on an insulating base 12 to provide a supporting effect for the hollow cathode shell.
The utility model is suitable for the manufacture of hollow spiral cathodes which can not be wound such as barium-tungsten cathodes
The above-mentioned embodiments further explain in detail the objects, technical solutions and advantages of the present invention, and it should be understood that the above-mentioned embodiments are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, and all the equivalent structures or equivalent processes that are used in the specification and drawings of the present invention are changed or directly or indirectly used in other related technical fields, and are all included in the scope of the present invention.
Claims (10)
1. A direct heating cathode emitter is characterized in that,
the direct heating type cathode emitter comprises a single spiral structure (1), an emitter initial end (15) and an emitter tail end (16);
the single-spiral structure (1) is independently arranged in the cavity of the hollow cathode;
the single-helix structure (1) is connected between an emitter starting end (15) and an emitter tail end (16);
the cathode emitter fixes the spatial position of the spiral structure (1) through an emitter starting end (15) and an emitter tail end (16).
2. A direct heating cathode emitter according to claim 1,
the upper end of the single-helix structure (1) is connected with the starting end (15) of the emitter, and the lower end of the single-helix structure is connected with the tail end (16) of the emitter;
the emitter initial end (15) comprises a structural section which is led out downwards from the upper end of the single-spiral structure (1), and the extending direction of the structural section is parallel to the axis of the single-spiral structure (1).
3. A direct heating cathode emitter according to claim 1,
the emitter starting end (15) and the emitter tail end (16) are respectively connected with an extraction electrode (13).
4. A direct heating cathode emitter according to claim 3,
the two extraction electrodes (13) penetrate through the insulating base (12) and are clamped on the insulating base (12).
5. A direct heating cathode emitter according to claim 4,
the two extraction electrodes (13) are clamped and brazed on the insulating base (12).
6. A direct heating cathode emitter according to claim 4,
a heat shielding plate (7) is arranged below the spiral structure (1),
the emitter starting end (15) and the emitter tail end (16) penetrate through the heat shielding plate (7) and are respectively connected with an extraction electrode (13).
7. A direct heating cathode emitter according to claim 6,
the heat shielding plate (7) and the insulating seat (12) are made of alumina.
8. A direct heating cathode emitter according to claim 3,
and the starting end (15) and the tail end (16) of the emitter are respectively welded with an extraction electrode (13) in an embedded mode.
9. A direct heating cathode emitter according to claim 8,
the welding mode is laser welding.
10. A direct heating cathode emitter according to claim 1,
the directly-heated cathode emitter is made of barium tungsten.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120257123.9U CN213958900U (en) | 2021-01-29 | 2021-01-29 | Directly-heated cathode emitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120257123.9U CN213958900U (en) | 2021-01-29 | 2021-01-29 | Directly-heated cathode emitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213958900U true CN213958900U (en) | 2021-08-13 |
Family
ID=77198432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120257123.9U Active CN213958900U (en) | 2021-01-29 | 2021-01-29 | Directly-heated cathode emitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213958900U (en) |
-
2021
- 2021-01-29 CN CN202120257123.9U patent/CN213958900U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP1505627B1 (en) | Magnetron | |
| CN102945778B (en) | Hollow cathode assembly | |
| CN212225465U (en) | Hollow cathode | |
| WO2001018842A9 (en) | Miniature x-ray source | |
| CN213958900U (en) | Directly-heated cathode emitter | |
| US3983443A (en) | Vacuum electron device having directly-heated matrix-cathode-heater assembly | |
| CN212318233U (en) | Heater embedded hollow cathode | |
| CN112768325B (en) | Directly-heated hollow cathode | |
| CN112103154A (en) | Indirect-heating lanthanum hexaboride cathode | |
| US4795940A (en) | Large area directly heated lanthanum hexaboride cathode structure having predetermined emission profile | |
| CN105895475B (en) | Composite cold cathode for orthogonal field microwave tube and manufacturing method thereof | |
| CN111997854A (en) | Heater embedded hollow cathode | |
| JP2710914B2 (en) | X-ray generating tube | |
| EP2503588A2 (en) | Cathodoluminiscent lighting system | |
| US5729084A (en) | Thermionic cathode with continuous bimetallic wall | |
| CN111911379A (en) | Hollow cathode | |
| US12119201B2 (en) | Cathode heater assembly and method of manufacture | |
| US4401919A (en) | Indirectly heated Wehnelt cathode | |
| US3319107A (en) | Plural rod getter between the heat source and heat sink of a vacuum tube | |
| CN213150711U (en) | Internal heating type LaB6 cathode | |
| CN212991029U (en) | Tubular lanthanum hexaboride cathode | |
| CN110379690B (en) | Cold cathode electron gun using radio frequency excitation field to emit electron beam | |
| CN112103155A (en) | Electron bombardment type lanthanum hexaboride cathode | |
| JPS63226852A (en) | Cathode structure for magnetron | |
| JPS63124351A (en) | X-ray tube device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |