CN103762134A - Heat shield component of hollow cathode - Google Patents
Heat shield component of hollow cathode Download PDFInfo
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- CN103762134A CN103762134A CN201310704033.XA CN201310704033A CN103762134A CN 103762134 A CN103762134 A CN 103762134A CN 201310704033 A CN201310704033 A CN 201310704033A CN 103762134 A CN103762134 A CN 103762134A
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- heat shield
- hollow cathode
- shield plate
- emitter
- baffle ring
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Abstract
The invention discloses a heat shield component of a hollow cathode. The hollow cathode comprises a cathode tube and an emitter. The heat shield component comprises at least two heat shield pieces and blocking rings. The heat shield pieces and the blocking rings are coaxially sleeved with the cathode tube, and every two adjacent heat shield pieces are separated by one blocking ring. The heat shield pieces can block axial radiative transfer of the emitter. Due to the fact that one blocking ring is arranged between every two adjacent heat shield pieces, heat contact between the heat shield pieces is effectively reduced, heat conduction loss is small, smooth gasflow of the working medium gas is ensured, the oxidation problem of the emitter is solved, the better heat shield effect is achieved, the service life of the emitter of the hollow cathode is prolonged, and the efficiency of the hollow cathode is improved.
Description
Technical field
The present invention relates to belong to aerospace electric propulsion technology, cryogenic vacuum electronics plasma technology field, relate in particular to a kind of heat shield assembly of hollow cathode.
Background technology
Hollow cathode is the key components of xenon ion thruster, hall thruster or other plasma sources.In the hollow cathode course of work, rely on inertia Working medium gas and form the temperature (more than 1300K) that heat that the gas discharge of controlling oneself produces maintains emitter, make emitter just can possess the ability of electron emission.Therefore, in the hollow cathode course of work, must continue the high-purity inertia Working medium gas that supply oxidizing gas content as far as possible may be low, otherwise, oxidative impurities gas may at high temperature interact with emitter, cause that emitter is poisoning, emitter excessive vaporization, significantly reduces emitter life, simultaneously, hollow cathode should adopt good heat shield assembly, to reduce emitter function of environment heat emission towards periphery, improves hollow cathode efficiency, reduces power consumption.
In existing hollow cathode, reach the Working medium gas purity on emitter surface, rely on source of the gas purity and guarantee, conventionally require in source of the gas oxidizing gas impurity content extremely low, make the cost of source of the gas significantly increase, in addition in some hollow cathodes, use independent purifier, purify oxidizing gas.In addition, existing hollow cathode has only adopted radially heat shielding, suppresses the heat radiation of emitter circumferencial direction, and to emitter, axial heat radiation does not shield, and axial heat radiation is not inhibited, and affects hollow cathode efficiency and improves.
Summary of the invention
Provide hereinafter about brief overview of the present invention, to the basic comprehension about some aspect of the present invention is provided.Should be appreciated that this general introduction is not about exhaustive general introduction of the present invention.It is not that intention is determined key of the present invention or pith, and nor is it intended to limit the scope of the present invention.Its object is only that the form of simplifying provides some concept, usings this as the preorder in greater detail of discussing after a while.
The invention provides a kind of heat shield assembly of hollow cathode, can reduce emitter function of environment heat emission towards periphery, to improve hollow cathode efficiency, to reduce power consumption.
To achieve these goals, the invention provides a kind of heat shield assembly of hollow cathode, wherein hollow cathode comprises: cathode tube and emitter, and described heat shield assembly comprises heat shield plate and baffle ring; Described heat shield plate and described baffle ring, coaxial is set in described cathode tube, described heat shield plate has two at least, and between every two adjacent described heat shield plates by described baffle ring interval.
Than prior art, the heat shield assembly of hollow cathode of the present invention, have two heat shield plates at least, and between each heat shield plate by baffle ring interval, this multilayer heat shield plate can be blocked emitter axial radiation and conduct heat, between adjacent two layers heat shield plate, baffle ring is installed, can effectively reduce thermo-contact between heat shield plate, guarantee that heat transfer conduction loss is little, guarantee that Working medium gas air-flow is unimpeded simultaneously, therefore structure of the present invention can effectively solve emitter problem of oxidation, and there is higher thermal resistance effect, thereby improve the hollow cathode heat efficiency, extend hollow cathode emitter life.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic diagram of the heat shield assembly of hollow cathode of the present invention.
Reference numeral:
1-cathode tube; 2-emitter; 3-heat shield plate; 4-baffle ring.
Embodiment
For making object, technical scheme and the advantage of the embodiment of the present invention clearer, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, rather than whole embodiment.The element of describing in an accompanying drawing of the present invention or a kind of execution mode and feature can combine with element and feature shown in one or more other accompanying drawing or execution mode.It should be noted that for purposes of clarity, in accompanying drawing and explanation, omitted expression and the description of unrelated to the invention, parts known to persons of ordinary skill in the art and processing.Embodiment based in the present invention, the every other embodiment that those of ordinary skills obtain under the prerequisite of not paying creative work, belongs to the scope of protection of the invention.
In the following embodiment of the present invention, the sequence number of embodiment and/or sequencing are only convenient to describe, and do not represent the quality of embodiment.Description to each embodiment all emphasizes particularly on different fields, and there is no the part of detailed description in certain embodiment, can be referring to the associated description of other embodiment.
The invention provides a kind of heat shield assembly of hollow cathode, wherein hollow cathode comprises cathode tube 1, emitter 2 and heat shield assembly, heat shield assembly comprises that heat shield plate 3 and baffle ring 4 form, above-mentioned heat shield plate 3 and baffle ring 4 coaxial sleeves are located in cathode tube 1, coaxially refer to that heat shield plate 3, baffle ring 4 and cathode tube 1 three are coaxial here.Above-mentioned heat shield plate 3 has two at least, and between every two adjacent heat shield plates 3 by baffle ring 4 intervals.
Multilayer heat shield plate 3 can be blocked emitter 2 axial radiations and conduct heat, baffle ring 4 is installed between adjacent two layers heat shield plate 3, can effectively reduce thermo-contact between heat shield plate 3, guarantee that heat transfer conduction loss is little, thermal loss vertically can reduce approximately 30%, guarantees that Working medium gas air-flow is unimpeded simultaneously, therefore structure of the present invention can effectively solve emitter 2 problem of oxidation, and there is higher thermal resistance effect, improve the hollow cathode heat efficiency, thereby extend hollow cathode 2 life-spans of emitter.
In above-mentioned heat shield plate and baffle ring, at least one is processed by oxidizing gas sorbing material.Can certainly be that the two is all oxidizing gas sorbing material.Above-mentioned heat shield plate 3 and baffle ring 4 are oxidizing gas sorbing material, can prevent or reduce oxidative impurities gas and at high temperature interact with emitter 2, cause that emitter 2 is poisoning, and emitter 2 excessive vaporization, to improve 2 life-spans of emitter.
In a kind of optional execution mode, above-mentioned oxidizing gas sorbing material is tantalum, and above-mentioned heat shield plate 3 and baffle ring 4 are made for tantalum material.Utilize tantalum material (more than 700K) under hot conditions can absorb feature, the purifying hollow cathode Working medium gas of oxidizing gas.
Above-mentioned heat shield plate 3 is optionally 10, and baffle ring 4 is 9, and between every two heat shield plates 3, all interval arranges a baffle ring 4, and, be appreciated that whole two ends of commening shield assembly warmly are heat shield plate 3.Can certainly understand heat shield plate 3 and form layer structure with baffle ring 4.
Optionally, on the axial direction of heat shield plate 3, each heat shield plate is formed with air vent hole, and the air vent hole on two adjacent heat shield plates is in axial direction done to orthographic projection, the orthographic projection of air vent hole from; And, take heat shield plate in baffle ring around region be first area, air vent hole is formed in first area at least partly.Also can be understood as, along the axial direction of above-mentioned heat shield plate 3, see heat shield plate 3, the heat shield plate 3(of outermost one deck outermost one deck here refers on this axial direction, first heat shield plate 3 that can see) on, there is an air vent hole, and this air vent hole is not blocked by baffle ring 4 completely, see through this air vent hole and can see the next heat shield plate 3 that makes progress the party.Certainly, on next heat shield plate 3, also have air vent hole, but see in the axial direction, the air vent hole on each heat shield plate 3, at least not can with the heat shield plate 3 adjacent with him on air vent hole have overlapping part.Or can be understood as, heat shield plate 3 axial directions of take are reference direction, and two adjacent heat shield plates 3 are done to orthographic projection along reference direction, in this projection, two air vent holes from.Be appreciated that the distribution mode of air vent hole on heat shield plate 3 has a variety of, but its function is all to guarantee can form optics shielding after each heat shield plate 3 combination, guarantees effective blocking radiant heat loss.Should be appreciated that, heat can be with the form transmission of light, and optics shielding can prevent hot loss of energy, and the heat energy that this form with light is transmitted, can be understood as thermal-radiating a kind of.
In order to guarantee can to locate after heat shield plate 3 and baffle ring 4 pack cathode tube 1 into, and can not skid off (dropping) from the other end of cathode tube 1, in cathode tube 1, form positioning convex, be used for to heat shield plate 3 location (because baffle ring 4 is between two heat shield plates 3, as long as locate a heat shield plate 3, baffle ring 4 will correspondingly be positioned).Optionally in cathode tube 1, form a step surface, this step surface is to heat shield plate 3 location.
Alternatively, after above-mentioned emitter 2 is sheathed in cathode tube 1, with cathode tube 1 welding.Certainly this is optional mode, and other connected mode can be for the present invention.
Describe above accessory size below in detail: heat shield plate 3 thickness are that 0.05-0.2mm, diameter are identical with emitter 2 diameters; Baffle ring 4 thickness are that 0.15-0.25mm, external diameter are identical with emitter 2 diameters, internal diameter is than the little 0.5-0.7mm of external diameter; Air vent hole diameter 0.5-1mm, air vent hole are 1-2mm apart from heat shield plate 3 edges.From then on also can know, baffle ring 4 is identical with heat shield plate 3 diameters, when they coaxially arrange, air vent hole is greater than the poor of baffle ring 4 external diameters and internal diameter apart from the distance at heat shield plate 3 edges, from then on can find out, in the axial direction, air vent hole can not blocked by baffle ring 4 yet.
In a kind of optionally example, it is that 0.1mm, diameter are identical with emitter 2 diameters that above-mentioned part is of a size of heat shield plate 3 thickness; Baffle ring 4 thickness are that 0.2mm, external diameter are identical with emitter 2 diameters, internal diameter is than the little 0.6mm of external diameter; Air vent hole diameter 0.8mm, air vent hole are 1.5mm apart from described heat shield plate 3 edges.
Certainly, above-mentioned accessory size, is optional execution mode, is not limited to the present invention.
Finally it should be noted that: although described above the present invention and advantage thereof in detail, be to be understood that in the situation that do not exceed the spirit and scope of the present invention that limited by appended claim and can carry out various changes, alternative and conversion.And scope of the present invention is not limited only to the specific embodiment of the described process of specification, equipment, means, method and step.One of ordinary skilled in the art will readily appreciate that from disclosure of the present invention, can use carry out with the essentially identical function of corresponding embodiment described herein or obtain process, equipment, means, method or step result essentially identical with it, that existing and will be developed future according to the present invention.Therefore, appended claim is intended to comprise such process, equipment, means, method or step in their scope.
Claims (10)
1. a heat shield assembly for hollow cathode, wherein hollow cathode comprises: cathode tube and emitter, it is characterized in that,
Described heat shield assembly comprises heat shield plate and baffle ring;
Described heat shield plate and described baffle ring, coaxial is set in described cathode tube, described heat shield plate has two at least, and between every two adjacent described heat shield plates by described baffle ring interval.
2. the heat shield assembly of hollow cathode according to claim 1, is characterized in that,
One of at least described heat shield plate and described baffle ring are processed by oxidizing gas sorbing material.
3. the heat shield assembly of hollow cathode according to claim 2, is characterized in that,
Described oxidizing gas sorbing material is tantalum.
4. the heat shield assembly of hollow cathode according to claim 1, is characterized in that,
On the axial direction of described heat shield plate, described in each, heat shield plate is formed with air vent hole, and the air vent hole on two adjacent heat shield plates is done to orthographic projection along described axial direction, the described orthographic projection of described air vent hole each other from;
And, take heat shield plate in described baffle ring around region be first area, described air vent hole is formed in described first area at least partly.
5. the heat shield assembly of hollow cathode according to claim 1, is characterized in that,
In described cathode tube, be formed with positioning convex, heat shield plate described in backstop.
6. the heat shield assembly of hollow cathode according to claim 1, is characterized in that,
Described emitter is set in described cathode tube, and described heat shield plate is kept out in described emitter one end.
7. the heat shield assembly of hollow cathode according to claim 6, is characterized in that,
After described emitter is sheathed in described cathode tube, with described cathode tube welding.
8. according to the heat shield assembly of the hollow cathode described in claim 1-7 any one, it is characterized in that,
Described heat shield plate thickness is that 0.05-0.2mm, diameter are identical with described emitter diameter.
9. according to the heat shield assembly of the hollow cathode described in claim 1-7 any one, it is characterized in that,
Described baffle ring thickness is that 0.15-0.25mm, external diameter are identical with described emitter diameter, internal diameter is than the little 0.5-0.7mm of described external diameter.
10. the heat shield assembly of hollow cathode according to claim 4, is characterized in that,
Described air vent hole diameter 0.5-1mm, described air vent hole are apart from described heat shield plate edge 1-2mm.
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| CN201310704033.XA CN103762134B (en) | 2013-12-19 | 2013-12-19 | The heat shield assembly of hollow cathode |
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| CN201310704033.XA CN103762134B (en) | 2013-12-19 | 2013-12-19 | The heat shield assembly of hollow cathode |
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| CN103762134B CN103762134B (en) | 2016-07-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108571431A (en) * | 2018-04-13 | 2018-09-25 | 哈尔滨工业大学 | A kind of mechanical support structure of magnetic focusing hall thruster hollow cathode |
| CN111120234A (en) * | 2019-12-19 | 2020-05-08 | 上海航天控制技术研究所 | Graphite high-temperature cathode device for electric thruster |
| CN112103155A (en) * | 2020-09-22 | 2020-12-18 | 成都创元电子有限公司 | Electron bombardment type lanthanum hexaboride cathode |
| CN112768325A (en) * | 2021-01-29 | 2021-05-07 | 成都创元电子有限公司 | Directly-heated hollow cathode |
| CN114263581A (en) * | 2021-11-11 | 2022-04-01 | 上海空间推进研究所 | Hollow cathode structure for propellant purification |
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| JPH01169857A (en) * | 1987-12-25 | 1989-07-05 | Mitsubishi Electric Corp | Hollow cathode discharge device |
| US20060132017A1 (en) * | 2002-06-27 | 2006-06-22 | Kaufman & Robinson, Inc. | Industrial hollow cathode with radiation shield structure |
| CN102945778A (en) * | 2012-11-30 | 2013-02-27 | 电子科技大学 | Hollow cathode assembly |
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2013
- 2013-12-19 CN CN201310704033.XA patent/CN103762134B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH01169857A (en) * | 1987-12-25 | 1989-07-05 | Mitsubishi Electric Corp | Hollow cathode discharge device |
| US20060132017A1 (en) * | 2002-06-27 | 2006-06-22 | Kaufman & Robinson, Inc. | Industrial hollow cathode with radiation shield structure |
| CN102945778A (en) * | 2012-11-30 | 2013-02-27 | 电子科技大学 | Hollow cathode assembly |
Non-Patent Citations (1)
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108571431A (en) * | 2018-04-13 | 2018-09-25 | 哈尔滨工业大学 | A kind of mechanical support structure of magnetic focusing hall thruster hollow cathode |
| CN111120234A (en) * | 2019-12-19 | 2020-05-08 | 上海航天控制技术研究所 | Graphite high-temperature cathode device for electric thruster |
| CN112103155A (en) * | 2020-09-22 | 2020-12-18 | 成都创元电子有限公司 | Electron bombardment type lanthanum hexaboride cathode |
| CN112103155B (en) * | 2020-09-22 | 2023-11-21 | 成都创元电子有限公司 | Electron bombardment type lanthanum hexaboride cathode |
| CN112768325A (en) * | 2021-01-29 | 2021-05-07 | 成都创元电子有限公司 | Directly-heated hollow cathode |
| CN112768325B (en) * | 2021-01-29 | 2022-11-29 | 成都创元电子有限公司 | Directly-heated hollow cathode |
| CN114263581A (en) * | 2021-11-11 | 2022-04-01 | 上海空间推进研究所 | Hollow cathode structure for propellant purification |
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| CN103762134B (en) | 2016-07-06 |
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