CN109899263B - Grid component of annular ion thruster - Google Patents
Grid component of annular ion thruster Download PDFInfo
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- CN109899263B CN109899263B CN201910321224.5A CN201910321224A CN109899263B CN 109899263 B CN109899263 B CN 109899263B CN 201910321224 A CN201910321224 A CN 201910321224A CN 109899263 B CN109899263 B CN 109899263B
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- 230000003014 reinforcing effect Effects 0.000 claims abstract description 35
- 238000003466 welding Methods 0.000 claims abstract description 28
- 239000000919 ceramic Substances 0.000 claims abstract description 22
- 230000001133 acceleration Effects 0.000 claims description 25
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 claims description 3
- 229910052750 molybdenum Inorganic materials 0.000 claims description 3
- 239000011733 molybdenum Substances 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 description 22
- 238000000034 method Methods 0.000 description 7
- 238000005728 strengthening Methods 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 4
- 238000000605 extraction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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Abstract
The grid component of the annular ion thruster comprises a screen grid, an accelerating grid, a first insulating ceramic ring, a second insulating ceramic ring, a combined screen grid supporting structure and a combined accelerating grid supporting structure. The screen grid and the accelerating grid are both annular, and the cross sections of the end surfaces of the screen grid and the accelerating grid are both convex arcs; the combined screen grid supporting structure comprises an outer ring, an inner ring, an arc-shaped reinforcing rib and a lug; the combined accelerating grid supporting structure comprises an outer ring, an inner ring, arc-shaped reinforcing ribs and protruding pieces, wherein the protruding pieces correspond to the lug pieces in position. The screen grid and the combined screen grid supporting structure, the accelerating grid and the combined accelerating grid supporting structure are fixed by welding, the first insulating ceramic ring and the second insulating ceramic ring are arranged between the screen grid and the accelerating grid, and the combined screen grid supporting structure and the combined accelerating grid supporting structure are fixed by bolts through the lugs and the lugs. The grid electrode assembly is light in weight, high in strength and strong in thermal deformation resistance, can effectively inhibit the phenomena of warping, wrinkling and the like on the surface of the grid electrode assembly, and improves the performance of the annular ion thruster.
Description
Technical Field
The invention relates to the field of electric propulsion of spacecrafts, in particular to an annular ion thruster grid component.
Background
The annular ion thruster is a brand-new on-orbit electric propulsion mode which is proposed in recent years, and has the advantages of high thrust (1-2N), high specific impulse (> 4000 s), high efficiency and the like, so that the annular ion thruster is favored by the electric propulsion market of international spacecrafts.
The grid component is a key component for accelerating and leading out beam ions of the annular ion thruster, and the structure of the grid component mainly comprises: screen grids, insulating ceramics, accelerating grids and a supporting structure. An accelerating electric field is formed by voltage loaded on a grid (the screen is 2000V, and the accelerating grid is-450V), ions in the discharge chamber are accelerated and extracted, and therefore thrust is generated. At present, a grid component of the annular ion thruster adopts a planar design scheme, namely, a screen grid and an accelerating grid are both in a planar structure, and the screen grid, the insulating ceramic, the accelerating grid and a supporting structure are fixed through screws.
Because annular ion thrustor operating power is high (10 kW ~ 20 kW) and the bore is great (> 50 cm), under the long-term heat accumulation effect in the course of the work for above-mentioned current planar structure grid subassembly takes place great thermal deformation easily, mainly includes: the surfaces of the screen grid and the accelerating grid are both irregular warped, wrinkled and the like, and the grid spacing is greatly deviated from an initial design value; at the same time, the binding force of the screw fixing mode becomes weaker, and potential danger exists for the thermal stability of the grid assembly. This will affect the acceleration and extraction of beam ions and cause a severe degradation of the performance of the thruster. Therefore, in order to improve the performance of the ring ion thruster, the structure of the gate assembly needs to be optimized.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the annular ion thruster grid assembly, and the annular ion thruster grid assembly has stronger thermal deformation resistance and can improve the structural strength of the annular ion thruster grid assembly by arranging the screen and the acceleration grid to be convex structures, arranging the reinforcing ribs on the combined screen supporting structure and the combined acceleration grid supporting structure and arranging the corresponding lugs and protruding pieces.
The technical scheme of the invention is as follows: the grid component of the annular ion thruster comprises a screen grid, an accelerating grid, a first insulating ceramic ring, a second insulating ceramic ring, a combined screen grid supporting structure and a combined accelerating grid supporting structure.
The screen grid and the accelerating grid are both annular, and the cross sections of the end surfaces of the screen grid and the accelerating grid are both convex arcs.
The combined screen grid supporting structure comprises an outer ring, an inner ring, an arc-shaped reinforcing rib and a lug piece; the quantity of arc strengthening rib is eight, and eight arc strengthening rib one end is connected with the outer loop through welding respectively, and the other end is connected with the inner ring through welding respectively, and eight arc strengthening rib annular equipartitions are on outer loop and inner ring. The number of the lug pieces is multiple, and the lug pieces are uniformly welded and annularly distributed on the inner ring and the outer ring respectively.
The combined accelerating grid supporting structure comprises an outer ring, an inner ring, arc-shaped reinforcing ribs and protruding pieces; the quantity of arc strengthening rib is eight, and eight arc strengthening rib one end is connected with the outer loop through welding respectively, and the other end is connected with the inner ring through welding respectively, and eight arc strengthening rib annular equipartitions are on outer loop and inner ring. The number of the lugs is multiple, and the lugs are uniformly and annularly distributed on the inner ring and the outer ring in a welding mode respectively.
The screen grid and the combined screen grid support structure are attached together and connected into a whole by welding, and the acceleration grid and the combined acceleration grid support structure are attached together and connected into a whole by welding; the lug on the combined type acceleration grid supporting structure corresponds to the lug on the combined type screen grid supporting structure in position, so that the combined type screen grid supporting structure and the combined type acceleration grid supporting structure can be fixed by screws; the first ring insulating ceramic ring and the second ring insulating ceramic ring are coaxially arranged between the screen grid and the accelerating grid, and are clamped and fixed through the screw and the insulating washer.
The further technical scheme of the invention is as follows: eighteen lugs are arranged, each lug is provided with a screw hole, an insulating sleeve is arranged in each screw hole, six lugs are uniformly welded on the inner ring of the inner ring, and twelve lugs are uniformly welded on the outer ring of the outer ring; the quantity of lug is eighteen, is equipped with the screw hole on every lug, and wherein six lugs adopt the welding evenly to arrange on the inner circle of inner ring, and twelve lugs adopt the welding evenly to arrange on the outer lane of outer loop.
The invention further adopts the technical scheme that: the arch height of the arc-shaped reinforcing ribs is the same as that of the screen grid and the accelerating grid respectively.
The further technical scheme of the invention is as follows: the screen grid and the accelerating grid are made of pure molybdenum materials, and the combined screen grid supporting structure, the combined accelerating grid supporting structure and the arc-shaped reinforcing ribs are made of TC4 titanium alloy materials.
Compared with the prior art, the invention has the following characteristics:
1. according to the invention, the screen grid and the accelerating grid of the annular ion thruster grid component are both of convex structures, so that the thermal deformation directions of the screen grid and the accelerating grid are both the protruding directions when the grid component is heated and expanded in the working process, the phenomena of warping, wrinkling and the like are avoided, and the smooth plasma extraction in the working process of the thruster is ensured.
2. The combined screen grid supporting structure and the combined accelerating grid supporting structure which are matched with the screen grid and the accelerating grid structure and provided with the reinforcing ribs are adopted, the reinforcing ribs can restrict the deformation of the grid assembly, and the displacement of the grid assembly in the protruding direction is hindered or reduced; and the reinforcing ribs and the surface of the grid electrode assembly, the grid electrode assembly and the combined screen grid supporting structure and the combined accelerating grid supporting structure are welded, so that the structural strength of the grid electrode assembly is greatly improved compared with the original grid electrode assembly with the inner ring and the outer ring fixed by screws.
3. The combined screen grid supporting structure and the combined accelerating grid supporting structure are respectively provided with the lug plates and the lug plates, after the lug plates and the lug plates are heated and expanded, the lug plates and the lug plates can generate thermal deformation, compared with the original mode of directly restraining by using screws, the damage of deformation displacement caused by thermal stress is small, and compared with the original mode of fixing rings, the design of the lug plates and the lug plates reduces the weight of the grid assembly.
The detailed structure of the present invention will be further described with reference to the accompanying drawings and the detailed description.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic structural diagram of a modular barrier support structure;
FIG. 4 is a cross-sectional view B-B of FIG. 3;
FIG. 5 is a schematic structural view of a modular acceleration grid support structure;
FIG. 6 is a cross-sectional view C-C of FIG. 5;
FIG. 7 is a schematic structural diagram of a screen grid;
fig. 8 is a cross-sectional view taken along line D-D of fig. 7.
Detailed Description
In one embodiment, as shown in fig. 1 to 8, a gate assembly of a ring ion thruster includes a screen 1, an acceleration grid 2, a first insulating ceramic ring 3-1, a second insulating ceramic ring 3-2, a combined screen support structure 4 and a combined acceleration grid support structure 5.
The screen 1 is annular, the cross section of the end face of the screen is a convex arc 1-1, the arch height of the arc 1-1 is h, and h is 5 mm.
The screen grid 1 is made of pure molybdenum material.
The structure of the accelerating grid 2 is the same as that of the screen grid 1, and the material is also the same.
The combined screen grid supporting structure 4 comprises an outer ring 4-1, an inner ring 4-2, arc-shaped reinforcing ribs 4-3 and lugs 4-4. The number of the arc-shaped reinforcing ribs 4-3 is eight, one ends of the eight arc-shaped reinforcing ribs 4-3 are respectively connected with the outer ring 4-1 through welding, the other ends of the eight arc-shaped reinforcing ribs are respectively connected with the inner ring 4-2 through welding, and the eight arc-shaped reinforcing ribs 4-3 are annularly and uniformly distributed on the outer ring 4-1 and the inner ring 4-2. The number of the lug pieces 4-4 is eighteen, each lug piece 4-4 is provided with a screw hole, an insulating sleeve 4-5 is arranged in each screw hole, six lug pieces 4-4 are uniformly arranged on the inner ring of the inner ring 4-2 in a welding mode, and twelve lug pieces 4-4 are uniformly arranged on the outer ring of the outer ring 4-1 in a welding mode.
The combined screen grid supporting structure 4, the arc-shaped reinforcing ribs 4-3 and the lug plates 4-4 are all made of TC4 titanium alloy materials.
The screen grid 1 is attached to the combined screen grid supporting structure 4 and is connected with the combined screen grid supporting structure 4 into a whole through welding, and the arc-shaped reinforcing ribs 4-3 on the combined screen grid supporting structure 4 can not only enhance the structural strength of the combined screen grid supporting structure 4 in the application process, but also reduce the thermal deformation displacement of the screen grid 1 in the convex surface direction.
The combined accelerating grid supporting structure 5 comprises an outer ring 5-1, an inner ring 5-2, arc-shaped reinforcing ribs 5-3 and protruding pieces 5-4. The number of the arc-shaped reinforcing ribs 5-3 is eight, one ends of the eight arc-shaped reinforcing ribs 5-3 are respectively connected with the outer ring 5-1 through welding, the other ends of the eight arc-shaped reinforcing ribs are respectively connected with the inner ring 5-2 through welding, and the eight arc-shaped reinforcing ribs 5-3 are annularly and uniformly distributed on the outer ring 5-1 and the inner ring 5-2. Eighteen convex sheets 5-4 are arranged, threaded holes are formed in each convex sheet 5-4, six convex sheets 5-4 are evenly arranged on the inner ring of the inner ring 5-2 through welding, and twelve convex sheets 5-4 are evenly arranged on the outer ring of the outer ring 4-1 through welding.
The combined accelerating grid supporting structure 5, the arc-shaped reinforcing ribs 5-3 and the protruding pieces 5-4 are all made of TC4 titanium alloy materials.
Grid 2 with higher speed is in the same place with 5 laminating of combination formula grid bearing structure with higher speed to as an organic whole through welded connection, the arc strengthening rib on the combination formula grid bearing structure with higher speed 5 not only can strengthen the structural strength of combination formula grid bearing structure with higher speed 5 application processes, can also reduce the thermal deformation displacement of grid 2 convex surface direction with higher speed.
Eighteen lugs 5-4 on the combined type acceleration grid support structure 5 correspond to eighteen lugs 4-4 on the combined type screen grid support structure 4 in position, the lugs 4-4 and the lugs 5-4 can generate certain thermal deformation after being heated and expanded, and compared with the original mode that the combined type screen grid support structure and the combined type acceleration grid support structure are directly fixed through screws, on one hand, the weight of the grid assembly is reduced, and on the other hand, the thermal stability of the grid assembly is improved.
When the integrated installation is carried out, the first ring of insulating ceramic ring 3-1 and the second ring of insulating ceramic ring 3-2 are coaxially arranged between the screen grid 1 and the acceleration grid 2, the first ring of insulating ceramic ring 3-1 and the second ring of insulating ceramic ring 3-2 are clamped and fixed through the screw 6 and the insulating washer 7, and the first ring of insulating ceramic ring 3-1 and the second ring of insulating ceramic ring 3-2 are used for insulating and supporting between the screen grid 1 and the acceleration grid 2, so that the screen grid 1 and the acceleration grid 2 are prevented from being broken down by high voltage to generate contact short circuit in the working process.
During the use, high voltage loads on the grid subassembly, the beam ion in the discharge chamber accelerates through screen 1 and acceleration grid 2 in turn and produces thrust, the heat that the acceleration of discharge chamber beam ion in-process accumulated makes screen 1 and acceleration grid 2 take place thermal deformation, because screen 1 and acceleration grid 2 are the convex surface structure, and the convex surface direction is unanimous, when the accumulated heat produced thermal deformation more, the direction of grid subassembly thermal deformation is the convex surface direction of screen 1 and acceleration grid 2, the axial direction at the grid subassembly is concentrated in to the direction of thermal deformation promptly, thereby effectively reduced the radial deformation of grid subassembly, the phenomenon such as grid subassembly warp has been reduced, the fold, ensure that the smooth of beam ion extraction and acceleration in the annular ion thruster working process, and then improve the performance of annular ion thruster.
Claims (4)
1. Annular ion thrust ware grid subassembly, characterized by: the combined type screen grid support structure comprises a screen grid, an accelerating grid, a first insulating ceramic ring, a second insulating ceramic ring, a combined type screen grid support structure and a combined type accelerating grid support structure;
the screen grid and the accelerating grid are both annular, and the cross sections of the end surfaces of the screen grid and the accelerating grid are both convex arcs;
the combined screen grid supporting structure comprises an outer ring, an inner ring, an arc-shaped reinforcing rib and a lug piece; the number of the arc reinforcing ribs is eight, one ends of the eight arc reinforcing ribs are respectively connected with the outer ring through welding, the other ends of the eight arc reinforcing ribs are respectively connected with the inner ring through welding, and the eight arc reinforcing ribs are annularly and uniformly distributed on the outer ring and the inner ring; the number of the lug plates is multiple, and the lug plates are uniformly welded and annularly distributed on the inner ring and the outer ring respectively;
the combined accelerating grid supporting structure comprises an outer ring, an inner ring, arc-shaped reinforcing ribs and protruding pieces; the number of the arc reinforcing ribs is eight, one ends of the eight arc reinforcing ribs are respectively connected with the outer ring through welding, the other ends of the eight arc reinforcing ribs are respectively connected with the inner ring through welding, and the eight arc reinforcing ribs are annularly and uniformly distributed on the outer ring and the inner ring; the number of the lugs is multiple, and the lugs are uniformly and annularly distributed on the inner ring and the outer ring by welding;
the screen grid and the combined screen grid support structure are attached together and connected into a whole by welding, and the acceleration grid and the combined acceleration grid support structure are attached together and connected into a whole by welding; the lug on the combined type acceleration grid supporting structure corresponds to the lug on the combined type screen grid supporting structure in position, so that the combined type screen grid supporting structure and the combined type acceleration grid supporting structure can be fixed by screws; the first insulating ceramic ring and the second insulating ceramic ring are coaxially arranged between the screen grid and the accelerating grid, and are clamped and fixed through the screw and the insulating washer.
2. The ring ion thruster gate assembly of claim 1 wherein: eighteen lugs are arranged, each lug is provided with a screw hole, an insulating sleeve is arranged in each screw hole, six lugs are uniformly welded on the inner ring of the inner ring, and twelve lugs are uniformly welded on the outer ring of the outer ring; the quantity of lug is eighteen, is equipped with the screw hole on every lug, and wherein six lugs adopt the welding evenly to arrange on the inner circle of inner ring, and twelve lugs adopt the welding evenly to arrange on the outer lane of outer loop.
3. The ring ion thruster gate assembly of claim 1 wherein: the arch height of the arc-shaped reinforcing ribs is the same as that of the screen grid and the accelerating grid respectively.
4. The ring ion thruster gate assembly of claim 1 wherein: the screen grid and the accelerating grid are made of pure molybdenum materials, and the combined screen grid supporting structure, the combined accelerating grid supporting structure, the arc-shaped reinforcing ribs, the lugs and the lugs are made of TC4 titanium alloy materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910321224.5A CN109899263B (en) | 2019-04-22 | 2019-04-22 | Grid component of annular ion thruster |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910321224.5A CN109899263B (en) | 2019-04-22 | 2019-04-22 | Grid component of annular ion thruster |
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| CN109899263A CN109899263A (en) | 2019-06-18 |
| CN109899263B true CN109899263B (en) | 2020-07-14 |
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| CN201910321224.5A Expired - Fee Related CN109899263B (en) | 2019-04-22 | 2019-04-22 | Grid component of annular ion thruster |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110594115B (en) * | 2019-10-17 | 2020-12-11 | 大连理工大学 | Ring-shaped ion thruster without discharge cathode |
| CN111526654A (en) * | 2020-05-09 | 2020-08-11 | 航宇动力技术(深圳)有限公司 | Quasi-neutral plasma beam extraction device |
| CN112555113B (en) * | 2020-11-06 | 2022-06-14 | 兰州空间技术物理研究所 | Integrated insulation structure of grid component of ion thruster |
| CN112696329B (en) * | 2020-12-14 | 2022-06-10 | 兰州空间技术物理研究所 | Ion thruster grid insulation connection structure and assembly method |
| CN113279930B (en) * | 2021-06-30 | 2022-07-12 | 哈尔滨工业大学 | Grid component assembly structure and assembly method of micro ion thruster |
| CN114934883A (en) * | 2022-05-25 | 2022-08-23 | 兰州空间技术物理研究所 | Curved surface grid assembly of ion thruster |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4956176A (en) * | 1989-06-20 | 1990-09-11 | Kraft General Foods, Inc. | Solids-fluid contacting apparatus with screen at fluid outlet |
| CN201256138Y (en) * | 2008-08-07 | 2009-06-10 | 冯毓材 | Ion beam leading out system for ionic source |
| CN103742427A (en) * | 2014-01-03 | 2014-04-23 | 中国计量学院 | Ionic fan applied to air-conditioner |
| CN104343651B (en) * | 2014-09-04 | 2017-04-05 | 兰州空间技术物理研究所 | A kind of flexible insulator for ion thruster grid assembly |
| CN104454417B (en) * | 2014-10-29 | 2017-04-12 | 大连理工大学 | Bi-order grid spiral wave ion propulsion device |
| CN105020112B (en) * | 2015-07-13 | 2017-11-03 | 兰州空间技术物理研究所 | A kind of ion thruster screen cylinder of high heat stability |
| CN106271006B (en) * | 2016-08-31 | 2018-07-31 | 兰州空间技术物理研究所 | A kind of ion thruster grid assembly of welding |
| CN206442574U (en) * | 2016-11-24 | 2017-08-25 | 四川智研科技有限公司 | A kind of grid for electron accelerator extraction window |
| CN107020549B (en) * | 2017-05-25 | 2019-03-01 | 西安工业大学 | Realize the focused ion beam level Four aperture plate system and method for fixed point removal |
| CN109576664B (en) * | 2017-09-28 | 2020-08-28 | 中国电子科技集团公司第四十八研究所 | Tri-grid assembly and ion source comprising same |
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Inventor after: Long Jianfei Inventor after: Li Juan Inventor after: Guo Dezhou Inventor after: Zhang Xueer Inventor after: Wang Yanlong Inventor after: Sun Mingming Inventor after: Chen Juanjuan Inventor before: Long Jianfei Inventor before: Sun Mingming |
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Effective date of registration: 20211227 Address after: 421001 Hunan province Hengyang Changsheng Road No. 28 Patentee after: University OF SOUTH CHINA Patentee after: LANZHOU INSTITUTE OF PHYSICS Address before: 421001 Hunan Province, Hengyang Zhengxiang District Road No. 28 Changsheng Patentee before: University OF SOUTH CHINA |
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