CN106373840A - Graphite contact-holding electrode used for hollow negative electrode - Google Patents
Graphite contact-holding electrode used for hollow negative electrode Download PDFInfo
- Publication number
- CN106373840A CN106373840A CN201610796040.0A CN201610796040A CN106373840A CN 106373840 A CN106373840 A CN 106373840A CN 201610796040 A CN201610796040 A CN 201610796040A CN 106373840 A CN106373840 A CN 106373840A
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- Prior art keywords
- heat shielding
- graphite
- support member
- contact
- pole cylinder
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/88—Mounting, supporting, spacing, or insulating of electrodes or of electrode assemblies
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- Physical Vapour Deposition (AREA)
- Electron Sources, Ion Sources (AREA)
Abstract
The invention relates to a graphite contact-holding electrode used for a hollow negative electrode, and belongs to an aerospace electric propulsion technology and the vacuum electronic field. The graphite contact-holding electrode mainly comprises a contact-holding electrode barrel, a thermal screen jacket, a molybdenum-rhenium foil, a thermal screen supporting part, an air exhausting cushion, an insulating ceramic part and a fastening assembly, wherein the graphite contact-holding electrode is prepared from a high-density graphite material, so that the sputtering etching resistance of the graphite contact-holding electrode is improved, the service life of the hollow negative electrode is prolonged, and the reliability of the hollow negative electrode is improved; residual gas in the graphite contact-holding electrode can be exhausted through the air exhausting cushion, so that a partial discharge phenomenon in a vacuum environment is avoided; and by virtue of a convex structure manufactured on the thermal screen jacket, a contact area between the thermal screen jacket and the molybdenum-rhenium foil can be reduced, thereby reducing the thermal loss of the contact-holding electrode and improving the effective thermal efficiency of the contact-holding electrode.
Description
Technical field
The present invention relates to a kind of graphite for hollow cathode in thruster touches holds pole, belong to aerospace electric propulsion skill
Art, vacuum electronic field.
Background technology
The Large Spacecraft that faces the future Orbit Transformation, remote survey of deep space are to high specific impulse, high thrust electric propulsion technology
Demand, long-life, highly reliable hollow cathode designing technique are key technologies being badly in need of in thruster development process breaking through.Deep
The mission requirements hollow cathode life-spans such as empty detection are more than 40000 hours, and switching on and shutting down number of times is more than 20000 times.According to domestic at present
The tantalum of outer development touches hold that pole hollow cathode occurs in thruster life test tactile and holds pole top sputtering etching problem, exposes sky
The heart-yin is extremely touched and held pole sputtering etching problem is restriction thruster product long-life, highly reliable main factor.
Content of the invention
Touch the problem holding pole intolerant to sputtering etching for tantalum in prior art, it is an object of the invention to provide one kind is used for
The graphite of hollow cathode touches and holds pole, and pole cylinder is held using graphite material making is tactile in described tactile pole of holding, and increased its resistant sputtering corrosion energy
Power, improves the life and reliability of hollow cathode.
The purpose of the present invention is achieved through the following technical solutions.
A kind of graphite for hollow cathode touches and holds pole, and described graphite touches to hold extremely mainly holds pole cylinder, heat shielding overcoat, molybdenum by tactile
Rhenium paper tinsel, heat shielding support member, vent pads, insulating ceramics and fastening assembly composition；
The described tactile end face holding pole cylinder blind end is provided with centre bore, and the outer circumference surface of open end is radially machined with peace
Dress plane；The tactile material holding pole cylinder is graphite material；
Described heat shielding overcoat closes the tubular structure of one end open for one end, and the end face of blind end is provided with centre bore；
Described heat shielding support member is divided into cylindrical tube and planar annular two parts, on the outer circumference surface of cylindrical tube one end by
It is sequentially provided with the first positioning step and the second positioning step to interior outward, the planar annular combining with the other end of cylindrical tube
End face is provided with the 3rd positioning step；
Described vent pads are misclosure o type vent pads；
Heat shielding overcoat is located at and touches the inside holding pole cylinder, and the open end of heat shielding overcoat is sleeved on the first positioning of heat shielding support member
On step；Molybdenum-rhenium paper tinsel is contacted with the inner peripheral surface of heat shielding overcoat, and by the second positioning step of heat shielding support member by molybdenum-rhenium
Paper tinsel carries out spacing；Touch the mounting plane holding pole cylinder open end between vent pads and insulating ceramics, insulating ceramics is placed in touch holds pole
Between the mounting plane of cylinder open end and the planar annular of heat shielding support member and by touching outer circumference surface and the heat shielding holding pole cylinder
3rd positioning step of support member is positioned；By fastening assembly by the planar annular of heat shielding support member, insulating ceramics, touch and hold
The mounting plane of pole cylinder open end and vent pads are fixedly connected.
Preferably, described touching holds pole cylinder using density ＞ 2g/cm3And the graphite material of purity ＞ 99.998%.
Preferably, the inner peripheral surface of described heat shielding overcoat is machined with the bulge-structure of irregular alignment, molybdenum-rhenium paper tinsel and heat
Bulge-structure on screen overcoat inner peripheral surface contacts, thus reducing transmission of heat by contact amount.
Beneficial effect:
(1) graphite of the present invention touches and holds pole from highdensity graphite material, increased and touches the resistant sputtering corruption holding pole
Erosion ability, improves the life and reliability of hollow cathode, it is to avoid hollow cathode end of lifetime is unnecessary by sputter that product causes
The risk of the thruster product failure that thing leads to；By vent pads, tactile pole internal residual gas of holding is discharged, it is to avoid vacuum environment
The phenomenon of shelf depreciation occurs；Put outside heat shielding and be machined with bulge-structure, to reduce between heat shielding overcoat and embedded molybdenum-rhenium paper tinsel
Contact area, holds very hot loss thus reducing and touching, and then increase is touched and held the very effective thermal efficiency.
(2) graphite of the present invention touches and holds pole processing technique simply, reduces and touches the difficulty holding pole processing and assembling；
The life-span of the hollow cathode holding pole was touched more than 40000 hours using described graphite, in work process, reliability is high.
Brief description
Fig. 1 is that the graphite described in embodiment touches the structural representation holding pole.
Wherein, 1- touches and holds pole cylinder, 2- heat shielding overcoat, 3- molybdenum-rhenium paper tinsel, 4- heat shielding support member, 5- vent pads, 6- insulating ceramics,
7- fastening assembly, 8- radome.
Specific embodiment
The present invention will be further described with reference to the accompanying drawings and detailed description.
As shown in figure 1, a kind of graphite for hollow cathode touches to hold extremely mainly holds pole cylinder 1, heat shielding overcoat 2, molybdenum-rhenium by tactile
Paper tinsel 3, heat shielding support member 4, vent pads 5, insulating ceramics 6, fastening assembly 7 and radome 8 form；
The described tactile end face holding pole cylinder 1 blind end is provided with centre bore, and the outer circumference surface of open end is radially provided with peace
Dress plane；Touch hold pole cylinder 1 material be density be 2.09g/cm3And the graphite material of purity ＞ 99.998%；Outside described heat shielding
Set 2 is the tubular structure being closed one end open by one end that tantalum foil rolls, and the end face of blind end is provided with centre bore, adopts
Rolling technology is machined with the bulge-structure of irregular alignment on the inner peripheral surface of heat shielding overcoat 2；Described heat shielding support member 4 is divided into
Cylindrical tube and planar annular two parts, the outer circumference surface of cylindrical tube one end is sequentially provided with the first positioning step from outside to inside
With the second positioning step, the end face of the planar annular combining with the other end of cylindrical tube is provided with the 3rd positioning step；Institute
Stating vent pads 5 is the misclosure o type vent pads having sector notch；Shown fastening assembly is mainly by ceramic part and bolt group
Become；
Heat shielding overcoat 2 is located at and touches the inside holding pole cylinder 1, and the open end of heat shielding overcoat 2 is passed through to be welded and fixed to be sleeved on heat shielding
On first positioning step of support member 4；Molybdenum-rhenium paper tinsel 3 be placed in heat shielding overcoat 2 inside and with the inner peripheral surface of heat shielding overcoat 2 on
Bulge-structure contacts, and is carried out molybdenum-rhenium paper tinsel 3 by the second positioning step on heat shielding support member 4 spacing；Tactile pole cylinder 1 of holding opens
The mounting plane at end between vent pads 5 and insulating ceramics 6, insulating ceramics 6 be placed in touch hold the mounting plane of pole cylinder 1 open end with
The outer circumference surface of pole cylinder 1 and the 3rd positioning table of heat shielding support member 4 is held between the planar annular of heat shielding support member 4 and by touching
Rank is positioned, and then the heater in the tactile centre bore holding pole cylinder 1 of guarantee, the centre bore and hollow cathode of heat shielding overcoat 2
Axiality；Radome 8 is placed in and touches the outside holding pole cylinder 1, and contacts with touching the outer surface holding pole cylinder 1；The bolt of fastening assembly 7
Sequentially pass through a ceramic part of fastening assembly 7, the planar annular of heat shielding support member 4, insulating ceramics 6, touch that to hold pole cylinder 1 open
The mounting plane at end, radome 8, another ceramic part of fastening assembly 7 and vent pads 5, thus will by fastening assembly 7
Each assembly described is fastenedly connected.
Described tactile pole cylinder 1 of holding needs to insulate, then be respectively provided with the pottery zero of fastening assembly 7 between vent pads 5 and radome 8
Part；Described touching is held pole cylinder 1 and is needed conduction, then do not need between one of vent pads 5 and radome 8 to arrange fastening assembly 7
Ceramic part.
In sum, these are only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.
All any modification, equivalent substitution and improvement within the spirit and principles in the present invention, made etc., should be included in the present invention's
Within protection domain.
Claims (3)
1. a kind of graphite for hollow cathode touch hold pole it is characterised in that: described graphite touch hold extremely mainly by touch holds pole cylinder
(1), heat shielding overcoat (2), molybdenum-rhenium paper tinsel (3), heat shielding support member (4), vent pads (5), insulating ceramics (6) and fastening assembly (7)
Composition；
The described tactile end face holding pole cylinder (1) blind end is provided with centre bore, and the outer circumference surface of open end is radially machined with peace
Dress plane；The tactile material holding pole cylinder (1) is graphite material；
Described heat shielding overcoat (2) closes the tubular structure of one end open for one end, and the end face of blind end is provided with centre bore；
Described heat shielding support member (4) is divided into cylindrical tube and planar annular two parts, on the outer circumference surface of cylindrical tube one end by
It is sequentially provided with the first positioning step and the second positioning step to interior outward, the planar annular combining with the other end of cylindrical tube
End face is provided with the 3rd positioning step；
Described vent pads (5) are misclosure o type vent pads；
Heat shielding overcoat (2) is located at and touches the inside holding pole cylinder (1), and the open end of heat shielding overcoat (2) is sleeved on heat shielding support member (4)
On first positioning step；Molybdenum-rhenium paper tinsel (3) is contacted with the inner peripheral surface of heat shielding overcoat (2), and by the of heat shielding support member (4)
Molybdenum-rhenium paper tinsel (3) is carried out spacing by two positioning steps；Touch the mounting plane holding pole cylinder (1) open end in vent pads (5) and insulation pottery
Between porcelain (6), insulating ceramics (6) is placed in touch holds the mounting plane of pole cylinder (1) open end and the planar annular of heat shielding support member (4)
Between and positioned by touching the 3rd positioning step of outer circumference surface and heat shielding support member (4) holding pole cylinder (1)；By tight
Gu assembly (7) by the planar annular of heat shielding support member (4), insulating ceramics (6), touch hold the mounting plane of pole cylinder (1) open end with
And vent pads (5) are fixedly connected.
2. a kind of graphite for hollow cathode according to claim 1 touch hold pole it is characterised in that: described touch hold pole cylinder
(1) adopt density ＞ 2g/cm3And the graphite material of purity ＞ 99.998%.
3. a kind of graphite for hollow cathode according to claim 1 touch hold pole it is characterised in that: described heat shielding overcoat
(2) bulge-structure of irregular alignment is machined with inner peripheral surface, on molybdenum-rhenium paper tinsel (3) and heat shielding overcoat (2) inner peripheral surface
Bulge-structure contacts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610796040.0A CN106373840B (en) | 2016-08-31 | 2016-08-31 | A kind of graphite for hollow cathode, which touches, holds pole |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610796040.0A CN106373840B (en) | 2016-08-31 | 2016-08-31 | A kind of graphite for hollow cathode, which touches, holds pole |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106373840A true CN106373840A (en) | 2017-02-01 |
| CN106373840B CN106373840B (en) | 2018-05-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610796040.0A Active CN106373840B (en) | 2016-08-31 | 2016-08-31 | A kind of graphite for hollow cathode, which touches, holds pole |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107031870A (en) * | 2017-03-03 | 2017-08-11 | 兰州空间技术物理研究所 | A kind of polycyclic surface of emission hundred pacifies level hollow cathode |
| CN108461366A (en) * | 2017-12-22 | 2018-08-28 | 兰州空间技术物理研究所 | A kind of integral type 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 |
| CN113357114A (en) * | 2021-07-19 | 2021-09-07 | 哈尔滨工业大学 | Main cathode assembly structure applied to thruster and assembly method thereof |
| CN114379824A (en) * | 2022-01-12 | 2022-04-22 | 哈尔滨工业大学 | Graphite touch electrode assembly of electric propulsion hollow cathode |
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| JP2000243356A (en) * | 1999-02-23 | 2000-09-08 | Hamamatsu Photonics Kk | Hollow cathode lamp |
| JP2004206997A (en) * | 2002-12-25 | 2004-07-22 | Nippon Denshi Kogyo Kk | Method and device for heat treating matter at high temperature |
| JP2009231291A (en) * | 2008-03-20 | 2009-10-08 | E2V Technologies (Uk) Ltd | Magnetron |
| CN204558411U (en) * | 2015-03-06 | 2015-08-12 | 兰州空间技术物理研究所 | A kind of closed hollow cathode with heat insulation effect touches holds pole assembly |
| CN105553298A (en) * | 2016-01-29 | 2016-05-04 | 深圳航天科技创新研究院 | Hollow cathode power converter and control system thereof |
| CN105609395A (en) * | 2015-12-28 | 2016-05-25 | 哈尔滨工业大学 | Novel hollow cathode |
-
2016
- 2016-08-31 CN CN201610796040.0A patent/CN106373840B/en active Active
Patent Citations (6)
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| JP2000243356A (en) * | 1999-02-23 | 2000-09-08 | Hamamatsu Photonics Kk | Hollow cathode lamp |
| JP2004206997A (en) * | 2002-12-25 | 2004-07-22 | Nippon Denshi Kogyo Kk | Method and device for heat treating matter at high temperature |
| JP2009231291A (en) * | 2008-03-20 | 2009-10-08 | E2V Technologies (Uk) Ltd | Magnetron |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107031870A (en) * | 2017-03-03 | 2017-08-11 | 兰州空间技术物理研究所 | A kind of polycyclic surface of emission hundred pacifies level hollow cathode |
| CN108461366A (en) * | 2017-12-22 | 2018-08-28 | 兰州空间技术物理研究所 | A kind of integral type 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 |
| CN111120234B (en) * | 2019-12-19 | 2021-02-23 | 上海航天控制技术研究所 | Graphite high-temperature cathode device for electric thruster |
| CN113357114A (en) * | 2021-07-19 | 2021-09-07 | 哈尔滨工业大学 | Main cathode assembly structure applied to thruster and assembly method thereof |
| CN113357114B (en) * | 2021-07-19 | 2022-05-06 | 哈尔滨工业大学 | Main cathode assembly structure applied to thruster and assembly method thereof |
| CN114379824A (en) * | 2022-01-12 | 2022-04-22 | 哈尔滨工业大学 | Graphite touch electrode assembly of electric propulsion hollow cathode |
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| Publication number | Publication date |
|---|---|
| CN106373840B (en) | 2018-05-08 |
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