CN108571431A - A kind of mechanical support structure of magnetic focusing hall thruster hollow cathode - Google Patents
A kind of mechanical support structure of magnetic focusing hall thruster hollow cathode Download PDFInfo
- Publication number
- CN108571431A CN108571431A CN201810332670.1A CN201810332670A CN108571431A CN 108571431 A CN108571431 A CN 108571431A CN 201810332670 A CN201810332670 A CN 201810332670A CN 108571431 A CN108571431 A CN 108571431A
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- Prior art keywords
- insulation layer
- thermal insulation
- outer cover
- support tube
- layer outer
- Prior art date
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- 238000009413 insulation Methods 0.000 claims abstract description 66
- 239000000919 ceramic Substances 0.000 claims abstract description 19
- 238000003466 welding Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 5
- 238000011144 upstream manufacturing Methods 0.000 description 3
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052573 porcelain Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000005439 thermosphere Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H—PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H1/00—Using plasma to produce a reactive propulsive thrust
- F03H1/0081—Electromagnetic plasma thrusters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H—PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H1/00—Using plasma to produce a reactive propulsive thrust
- F03H1/0006—Details applicable to different types of plasma thrusters
- F03H1/0031—Thermal management, heating or cooling parts of the thruster
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H—PRODUCING A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03H1/00—Using plasma to produce a reactive propulsive thrust
- F03H1/0037—Electrostatic ion thrusters
- F03H1/0062—Electrostatic ion thrusters grid-less with an applied magnetic field
- F03H1/0075—Electrostatic ion thrusters grid-less with an applied magnetic field with an annular channel; Hall-effect thrusters with closed electron drift
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Plasma Technology (AREA)
Abstract
The present invention relates to a kind of mechanical support structures of magnetic focusing hall thruster hollow cathode, belong to electric propulsion thruster technical field.The present invention prevents cathode tube under vibration environment from angular deflection occurs to fix heat shielding and cathode tube.Thermal insulation layer outer cover is cylindrical shape with support tube, one end of thermal insulation layer outer cover is equipped with head cover, and circular through hole is provided at top cap central, there is certain taper in the front end of support tube, the diameter of the front end of support tube is equal with the diameter of thermal insulation layer outer cover, the front end of thermal insulation layer outer cover and support tube is integrally formed part using laser welding, thermal insulation layer is set to the inside of thermal insulation layer outer cover, thermal insulation layer is close to the inner wall of thermal insulation layer outer cover, the rear end of support tube is equipped with ceramic fixed frame, and ceramic fixed frame and support tube are linked into an integrated entity part by arc welding.The present invention contributes to the steady operation of emitter and extends working life.
Description
Technical field
The present invention relates to a kind of mechanical support structures of magnetic focusing hall thruster hollow cathode, belong to electric propulsion thruster
Technical field.
Background technology
Hall thruster is a kind of advanced electric propulsion device, with the advantages that its high efficiency, high specific impulse and high reliability
Position through being widely used in satellite is kept and gesture stability, and as the heat in each spacefaring nation electric propulsion device research in the world
Point.Hollow cathode is electric propulsion system reliability and working life critical component.Hollow cathode operating mode is in high temperature, plasma
Close quarters, running environment are severe.In the environment of mechanics shakes, the heat shielding for rotating winding is easy to fall off for existing design, Gu
Determine to be easy bias between the cathode tube of emitter and cathode sleeve, causes hollow cathode performance to decline and even fail.
Invention content
The present invention prevents cathode tube under vibration environment from angular deflection occurs, is taken to fix heat shielding and cathode tube
Technical solution it is as follows：
A kind of mechanical support structure of magnetic focusing hall thruster hollow cathode, including thermal insulation layer outer cover, thermal insulation layer, support
Cylinder, air inlet pipe and ceramic fixed frame；
The thermal insulation layer outer cover is cylindrical shape with support tube, and one end of the thermal insulation layer outer cover is equipped with head cover, and in head cover
Be provided with circular through hole at center, there is certain taper in the front end of the support tube, the diameter of the front end of the support tube with it is heat-insulated
The diameter of layer outer cover is equal, and the front end of the thermal insulation layer outer cover and support tube is integrally formed part using laser welding, described heat-insulated
Layer is set to the inside of thermal insulation layer outer cover, and thermal insulation layer is close to the inner wall of thermal insulation layer outer cover, and the rear end of the support tube is equipped with ceramics admittedly
Determine frame, ceramic fixed frame and support tube are linked into an integrated entity part by arc welding；
The air inlet pipe level is in axial direction disposed through the center of the support tube；The air inlet pipe head end
It extends to inside the thermal insulation layer outer cover, and positioned at the center of the thermal insulation layer outer cover；The tail end of the air inlet pipe extends
To outside ceramic fixed frame.
It further limits, the diameter of the thermal insulation layer outer cover is less than the diameter of support tube rear end.
It further limits, the thermal insulation layer shroud surface is uniformly provided with multiple heat emission holes, and between adjacent two rows of heat emission holes
Interlaced arrangement.
It further limits, support tube surface is uniformly provided with multiple round rectangle through-holes, and adjacent two rows of round rectangle through-holes
Between interlaced arrangement.
It further limits, the thermal insulation layer outer cover, thermal insulation layer, support tube and air inlet pipe are made of heat-resisting material.
It further limits, the air inlet pipe between thermal insulation layer outer cover and support tube is the first half of air inlet pipe, is extended to
It is the latter half of air inlet pipe outside ceramic fixed frame, front and back two parts of the air inlet pipe are linked into an integrated entity by arc welding
Part.
It further limits, the first half caliber of the air inlet pipe is more than the caliber of latter half.
The present invention has the following effects that compared with prior art：The present invention relates to a kind of hollow the moon of magnetic focusing hall thruster
The mechanical support structure of pole, entire support construction use hollow design, the mechanical support structure of design to fix heat shielding and the moon simultaneously
Pole pipe.And the thermal loss for ensureing emitter to greatest extent contributes to the steady operation of emitter and extends working life, together
When avoid hollow cathode upstream structure temperature is excessive from causing harmful effect to other equipment.
Description of the drawings
Fig. 1 is a kind of mechanical support structure structural schematic diagram of magnetic focusing hall thruster hollow cathode of the present invention；
Fig. 2 be a kind of magnetic focusing hall thruster hollow cathode of the present invention mechanics in support tube schematic diagram；
Fig. 3 be a kind of magnetic focusing hall thruster hollow cathode of the present invention mechanics in thermal insulation layer outer cover signal
Figure.
Feature in figure：It touches and holds grade 1, thermal insulation layer outer cover 2, cathode tube 3, emitter 4, thermal insulation layer 5, support tube 6, air inlet pipe 7,
Ceramic fixed frame 8.
Specific implementation mode
With reference to specific embodiment, the present invention will be further described, but the present invention should not be limited by the examples.
Specific implementation mode：Illustrate present embodiment in conjunction with Fig. 1 to Fig. 3：It is poly- that present embodiment carries a kind of magnetic
The mechanical support structure of burnt hall thruster hollow cathode, including thermal insulation layer outer cover 2, thermal insulation layer 5, support tube 6,7 and of air inlet pipe
Ceramic fixed frame 8；The thermal insulation layer outer cover 2 is cylindrical shape with support tube 6, and one end of the thermal insulation layer outer cover 2 is equipped with head cover, and
Be provided with circular through hole at top cap central, there is certain taper in the front end of the support tube 6, the front end of the support tube 6 it is straight
Diameter is equal with the diameter of thermal insulation layer outer cover 2, and the front end of the thermal insulation layer outer cover 2 and support tube 6 is integrally formed using laser welding
Part, the thermal insulation layer 5 are set to the inside of thermal insulation layer outer cover 2, and thermal insulation layer 5 is close to the inner wall of thermal insulation layer outer cover 2, the support tube 6
Rear end be equipped with ceramic fixed frame 8, ceramic fixed frame 8 and support tube 6 are linked into an integrated entity part by arc welding；The air inlet pipe 7
Level is in axial direction disposed through the center of the support tube 6；7 head end of the air inlet pipe extends to the thermal insulation layer
Inside outer cover 2, and positioned at the center of the thermal insulation layer outer cover 2；The tail end of the air inlet pipe 7 extends to ceramic fixed frame 8
Outside.The diameter of the thermal insulation layer outer cover 2 is less than the diameter of 6 rear end of support tube.2 surface of thermal insulation layer outer cover is uniformly provided with multiple
Heat emission hole, and interlaced arrangement between adjacent two rows of heat emission holes.6 surface of support tube is uniformly provided with multiple round rectangle through-holes, and phase
Interlaced arrangement between adjacent two rows round rectangle through-hole.The thermal insulation layer outer cover 2, thermal insulation layer 5, support tube 6 and air inlet pipe 7 are using resistance to
High-temperature material is made.Air inlet pipe 7 between thermal insulation layer outer cover 2 and support tube 6 is the first half of air inlet pipe 7, extends to pottery
It is the latter half of air inlet pipe 7 outside porcelain fixed frame 8, front and back two parts of the air inlet pipe 7 are linked into an integrated entity by arc welding
Part.The first half caliber of the air inlet pipe 7 is more than the caliber of latter half.
The effect of support tube 6 is support thermal insulation layer outer cover 2, and thermal insulation layer outer cover 2 plays the role of fixed heat shielding, due to cathode
Pipe 3 is cantilever design, while contributing to fixed negative pole pipe 3, prevents heat shielding from falling off under mechanics vibrations, has changed simultaneously whole knot
The thermal conduction characteristic of structure, emitter 4 and 3 bottom of cathode tube under working environment by plasma bombardment when generate big calorimetric
Amount, is total main heating source, the transmission of heat is divided into several aspects：Heat is managed from a part from emitter 4 through air inlet pipe 7
To 7 upstream cold end flow of air inlet pipe, a part is conducted to support tube 6 by heat radiation during flowing, and a part is passed through
Radiate and be transmitted to thermal insulation layer outer cover 2 to thermal insulation layer 5, some through 2 head end of thermal insulation layer outer cover by heat transfer to entirely every
Thermosphere outer cover 2.4 heat of emitter passes to hollow cathode upstream by entire support construction in order to prevent, reduces emitter 4
Thermal loss, by entire support construction hollow design, and thermal insulation layer outer cover 2 is using the dislocation design of the strip hole of hollow out, branch
Round rectangle dislocation design of the cylinder 6 using hollow out is supportted, the lateral transport for reducing heat along support construction is maximized, in support construction
Temperature heat conduction transmission is obstructed, and the bulk temperature of emitter 4 is made to increase.6 rear end of support tube setting ceramic fixed frame 8 mainly for
Coordinate with other component, plays fixed insulating ceramics.
A kind of mechanical support structure of magnetic focusing hall thruster hollow cathode of the present invention do not limit to it is above-mentioned each
Concrete structure described in a embodiment can also be the reasonable combination of feature described in above-mentioned each embodiment.
Claims (7)
1. a kind of mechanical support structure of magnetic focusing hall thruster hollow cathode, which is characterized in that including thermal insulation layer outer cover
(2), thermal insulation layer (5), support tube (6), air inlet pipe (7) and ceramic fixed frame (8)；
The thermal insulation layer outer cover (2) and support tube (6) are cylindrical shape, and one end of the thermal insulation layer outer cover (2) is equipped with head cover, and
Circular through hole is provided at top cap central, there is certain taper in the front end of the support tube (6), the front end of the support tube (6)
Diameter is equal with the diameter of thermal insulation layer outer cover (2), and the thermal insulation layer outer cover (2) and the front end of support tube (6) use laser welding
It is integrally formed part, the thermal insulation layer (5) is set to the inside of thermal insulation layer outer cover (2), and thermal insulation layer (5) is close to thermal insulation layer outer cover (2)
The rear end of inner wall, the support tube (6) is equipped with ceramic fixed frame (8), and ceramic fixed frame (8) passes through arc welding with support tube (6)
Link into an integrated entity part；
The horizontal center for being in axial direction disposed through the support tube (6) of the air inlet pipe (7)；The air inlet pipe
(7) head end extends to thermal insulation layer outer cover (2) inside, and positioned at the center of the thermal insulation layer outer cover (2)；The air inlet
The tail end of pipe (7) extends to ceramic fixed frame (8) outside.
2. a kind of mechanical support structure of magnetic focusing hall thruster hollow cathode according to claim 1, feature exist
In the diameter of the thermal insulation layer outer cover (2) is less than the diameter of support tube (6) rear end.
3. a kind of mechanical support structure of magnetic focusing hall thruster hollow cathode according to claim 1, feature exist
In thermal insulation layer outer cover (2) surface is uniformly provided with multiple heat emission holes, and interlaced arrangement between adjacent two rows of heat emission holes.
4. a kind of mechanical support structure of magnetic focusing hall thruster hollow cathode according to claim 1, feature exist
In support tube (6) surface is uniformly provided with multiple round rectangle through-holes, and interlaced arrangement between adjacent two rows of round rectangle through-holes.
5. a kind of mechanical support structure of magnetic focusing hall thruster hollow cathode according to claim 1, feature exist
In the thermal insulation layer outer cover (2), thermal insulation layer (5), support tube (6) and air inlet pipe (7) are made of heat-resisting material.
6. a kind of mechanical support structure of magnetic focusing hall thruster hollow cathode according to claim 1, feature exist
In the air inlet pipe (7) between thermal insulation layer outer cover (2) and support tube (6) is the first half of air inlet pipe (7), extends to ceramics
Fixed frame (8) is the latter half of air inlet pipe (7) outside, and front and back two parts of the air inlet pipe (7) are connected by arc welding
Integral piece.
7. a kind of mechanical support structure of magnetic focusing hall thruster hollow cathode according to claim 6, feature exist
In the first half caliber of the air inlet pipe (7) is more than the caliber of latter half.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810332670.1A CN108571431B (en) | 2018-04-13 | 2018-04-13 | A kind of mechanical support structure of magnetic focusing hall thruster hollow cathode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810332670.1A CN108571431B (en) | 2018-04-13 | 2018-04-13 | A kind of mechanical support structure of magnetic focusing hall thruster hollow cathode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108571431A true CN108571431A (en) | 2018-09-25 |
| CN108571431B CN108571431B (en) | 2019-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810332670.1A Active CN108571431B (en) | 2018-04-13 | 2018-04-13 | A kind of mechanical support structure of magnetic focusing hall thruster hollow cathode |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111927725A (en) * | 2020-08-18 | 2020-11-13 | 哈尔滨工业大学 | Hollow cathode emitter structure |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11111217A (en) * | 1997-08-07 | 1999-04-23 | Smiths Ind Plc | Electrode structure body |
| CN101599400A (en) * | 2008-06-02 | 2009-12-09 | 中国航天科技集团公司第五研究院第五一○研究所 | A kind of assembly type hollow cathode heater |
| CN103762134A (en) * | 2013-12-19 | 2014-04-30 | 兰州空间技术物理研究所 | Heat shield component of hollow cathode |
| CN105788998A (en) * | 2016-04-19 | 2016-07-20 | 北京航空航天大学 | Small-size and miniwatt hollow barium-tungsten cathode |
| CN107387347A (en) * | 2017-07-19 | 2017-11-24 | 哈尔滨工业大学 | hollow cathode thruster for cube satellite |
| US20170367168A1 (en) * | 2016-06-16 | 2017-12-21 | The Government Of The United States Of America, As Represented By The Secretary Of The Navy | Thermally isolated thermionic hollow cathodes |
-
2018
- 2018-04-13 CN CN201810332670.1A patent/CN108571431B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11111217A (en) * | 1997-08-07 | 1999-04-23 | Smiths Ind Plc | Electrode structure body |
| CN101599400A (en) * | 2008-06-02 | 2009-12-09 | 中国航天科技集团公司第五研究院第五一○研究所 | A kind of assembly type hollow cathode heater |
| CN103762134A (en) * | 2013-12-19 | 2014-04-30 | 兰州空间技术物理研究所 | Heat shield component of hollow cathode |
| CN105788998A (en) * | 2016-04-19 | 2016-07-20 | 北京航空航天大学 | Small-size and miniwatt hollow barium-tungsten cathode |
| US20170367168A1 (en) * | 2016-06-16 | 2017-12-21 | The Government Of The United States Of America, As Represented By The Secretary Of The Navy | Thermally isolated thermionic hollow cathodes |
| CN107387347A (en) * | 2017-07-19 | 2017-11-24 | 哈尔滨工业大学 | hollow cathode thruster for cube satellite |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN111927725A (en) * | 2020-08-18 | 2020-11-13 | 哈尔滨工业大学 | Hollow cathode emitter structure |
| CN111927725B (en) * | 2020-08-18 | 2021-07-13 | 哈尔滨工业大学 | Hollow cathode emitter structure |
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| Publication number | Publication date |
|---|---|
| CN108571431B (en) | 2019-07-23 |
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Effective date of registration: 20240423 Address after: Room 1107, 11 / F, National University Science Park, Harbin Institute of technology, No. 434, youyou street, Nangang District, Harbin City, Heilongjiang Province Patentee after: Harbin Institute of Technology Asset Management Co.,Ltd. Country or region after: China Patentee after: Harbin Prashi Power Technology R&D Department (Limited Partnership) Address before: 150001 No. 92 West straight street, Nangang District, Heilongjiang, Harbin Patentee before: HARBIN INSTITUTE OF TECHNOLOGY Country or region before: China |
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Effective date of registration: 20240517 Address after: Room 217, 1st Floor, East Zone, Building 2, Science and Technology Innovation Headquarters, Shenzhen (Harbin) Industrial Park, 288 Zhigu Street, Songbei District, Harbin City, Heilongjiang Province, 150000 RMB Patentee after: Harbin Xingwang Power Technology Co.,Ltd. Country or region after: China Address before: Room 1107, 11 / F, National University Science Park, Harbin Institute of technology, No. 434, youyou street, Nangang District, Harbin City, Heilongjiang Province Patentee before: Harbin Institute of Technology Asset Management Co.,Ltd. Country or region before: China Patentee before: Harbin Prashi Power Technology R&D Department (Limited Partnership) |