CN105070425B - Electric thruster insulation assembly having anti-sputtering labyrinth structure - Google Patents

Electric thruster insulation assembly having anti-sputtering labyrinth structure Download PDF

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Publication number
CN105070425B
CN105070425B CN201510409678.XA CN201510409678A CN105070425B CN 105070425 B CN105070425 B CN 105070425B CN 201510409678 A CN201510409678 A CN 201510409678A CN 105070425 B CN105070425 B CN 105070425B
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CN
China
Prior art keywords
radome
insulating ceramics
annular
electrode
angle locating
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CN201510409678.XA
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Chinese (zh)
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CN105070425A (en
Inventor
李沛
王亮
张天平
顾左
李娟�
唐福俊
赵以德
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兰州空间技术物理研究所
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Priority to CN201510409678.XA priority Critical patent/CN105070425B/en
Publication of CN105070425A publication Critical patent/CN105070425A/en
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Publication of CN105070425B publication Critical patent/CN105070425B/en

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Abstract

The invention discloses an electric thruster insulation assembly having an anti-sputtering labyrinth structure. The assembly comprises an exhaust hood, a first shielding case, a second shielding case, a third shielding case, a first insulation ceramic, a second insulation ceramic, a screw and a nut. The first shielding case is connected with the first insulation ceramic through brazing to form a part, the second shielding case and the third shielding case are connected with the second insulation ceramic through brazing to form another part, the exhaust hood and the two parts are connected together through the screw in a serial-connection screwed manner then, and electrical isolation between different electrodes is achieved. The electrical isolation between the different electrodes can be achieved. On one aspect, sputtering deposition pollution for surfaces of insulation ceramics when an electric thruster works can be obviously reduced, and a phenomenon of insulation capability reduction caused by ceramic pollution is prevented; and, on the other aspect, through exhaust design performed on the shielding cases, a risk of low-pressure discharge between two electrodes is effectively prevented, and stable working of the electric thruster is facilitated.

Description

A kind of electric thruster insulation assembly of Anti-splash labyrinth structure
Technical field
The present invention relates to a kind of insulation assembly of electric thruster, particularly a kind of insulation assembly of Anti-splash labyrinth structure, Belong to space technology and electrovacuum insulation technology field.
Background technology
Insulation assembly in electric thruster is mainly used to the part of different potentials in electric thruster is electrically insulated, if its It is unable to reliably working, then can cause each potential short circuit of electric thruster, thus causing electric thruster function to lose, meeting under serious conditions Affect whole star steady operation, or even satellite Important Components burn.
Insulation assembly in existing thruster can occur insulating ceramics pollution to lead to insulating capacity to decline often, gas discharge Punch-through, occurs in mechanical test that insulant is scaling-off, phenomenon of rupture, thus affecting the reliably working of insulation assembly.
Content of the invention
In view of this, the invention provides a kind of electric thruster insulation assembly, employ Anti-splash radome labyrinth structure, Improved by the design of structure, can effectively solve the problem that the pollution of its insulating ceramics, gas discharge puncture and mechanical test in insulation Material is scaling-off, phenomenon of rupture, and the job stability of insulation assembly is greatly improved.
In order to solve above-mentioned technical problem, the present invention is achieved in that
A kind of electric thruster insulation assembly of Anti-splash labyrinth structure, for the electrode x to different potentials in electric thruster Carry out insulating mounting with electrode y;This insulation assembly includes: have the hood of same diameter central through hole, the first insulating ceramics, First radome, secondary shielding cover, the second insulating ceramics and the 3rd radome, also include screw and nut;
First insulating ceramics and the second insulating ceramics are cylindrical structural, the central fovea on the first insulating ceramics end face Matched with the central boss on the second insulating ceramics end face in hole;
First radome is the cylinder with annular bottom surface, and its inner bottom surface has a step surface a with the corner of medial surface, The inner bottom surface of this first radome and step surface a collectively form annular right-angle locating surface a;On first insulating ceramics, there is central fovea The outer rim of the end face in hole is placed at annular right-angle locating surface a, and carries out soldering at annular right-angle locating surface a, thus by One insulating ceramics is fixed with the first radome, forms first assembly;
Secondary shielding cover is notch cuttype two-part cylinder;Form annular right-angle at segment and the external corner of interior joint face of big section Locating surface b, has a step surface b at inner corner trim, segment collectively forms annular right-angle positioning with the interior joint face of big section with step surface b Face c;The secondary shielding enclosure is connected at the step surface of the second insulating ceramics, the inner corner trim of the step surface of this second insulating ceramics and external corner Contact with annular right-angle locating surface b and annular right-angle locating surface c respectively, and in annular right-angle locating surface b and annular right-angle positioning Carry out soldering, thus the second insulating ceramics is fixed with secondary shielding cover at the c of face;
3rd radome is the cylinder with annular bottom surface, is arranged on one end that the second insulating ceramics is not provided with central boss Face, and carry out soldering at the 3rd radome inner bottom surface with medial surface formation annular right-angle locating surface d, thus the second insulation is made pottery Porcelain is fixed with the 3rd radome;Secondary shielding cover, the second insulating ceramics and the 3rd radome form the second assembly;
Hood is the cylinder with annular bottom surface, and annular bottom surface has the outgassing groove of connection central through hole;
Together with hood, first assembly, electrode x, the second assembly are arranged in order with electrode y, passed through described using bolt Central through hole is spirally connected with nut;After being spirally connected, hood is arranged on the first insulating ceramics and does not set outside the end face of central pit hole, and second The central boss of insulating ceramics passes through electrode x and the first radome to stretch in the central pit hole of the first insulating ceramics, secondary shielding The segment of cover stretches into electrode x, stretches into the thickness that distance is less than electrode x;First radome and secondary shielding cover are located at electrode x's Both sides;3rd radome contact electrode y;
With bolt axially as reference, there is between hood and the first radome axially spaced-apart, secondary shielding cover and the 3rd Also there is between radome axially spaced-apart.
Preferably, the outer joint face of two sections of described secondary shielding cover with the depth of parallelism of the 3rd radome bottom surface outer surface is 0.02mm, the 3rd radome bottom surface outer surface has the flatness of 0.02mm.
Preferably, there is at soldering the fit-up gap of 0.15mm~0.25mm.
Beneficial effect:
Designed by radome labyrinth structure, maximize and cover the outer drain surface of insulating ceramics, decrease insulating ceramics table The phenomenon of face sputtering pollution, increased the reliability of two electric electrode insulations.
Meanwhile, vent design has been carried out to radome, effectively reduced the risk of local low pressure discharge.
And, radome is connected using soldering processes with insulating ceramics, improves its mechanical performance, it is to avoid in power Learn insulating ceramics in test and scaling-off, fracture phenomenon occurs.
Brief description
Fig. 1 is the electric thruster insulation assembly structural representation of Anti-splash labyrinth structure of the present invention;
Fig. 2 is the first radome and the first assembly structural representation of the first insulating ceramics composition;
Fig. 3 is the second modular construction schematic diagram of secondary shielding cover, the 3rd radome and the second insulating ceramics composition;
Fig. 4 is hood anti-low pressure discharge notching construction schematic diagram.
Fig. 5 is the schematic diagram of secondary shielding cover.
Wherein, 1- hood, 11- outgassing groove, 2- first insulating ceramics, 21- central pit hole, 3- first radome, 31 Terrace a, 4- secondary shielding cover, the interior joint face of two sections of 41- secondary shielding cover, 42- annular right-angle locating surface b, 43- step surface b, 44- annular right-angle locating surface c, the outer joint face of two sections of 45- secondary shielding cover, 5- second insulating ceramics, 51- central boss, 6- 3rd radome, 61- annular right-angle locating surface d, 62- the 3rd radome bottom surface outer surface, 7- screw, 8- nut.
Specific embodiment
Develop simultaneously embodiment below in conjunction with the accompanying drawings, describes the present invention.
The invention provides a kind of electric thruster insulation assembly of Anti-splash labyrinth structure, for different in electric thruster The electrode x of current potential and electrode y carries out insulating mounting.As shown in figure 1, this insulation assembly includes: hood 1, the first insulating ceramics 2nd, the first radome 3, secondary shielding cover 4, the second insulating ceramics 5 and the 3rd radome 6, screw 7 and nut 8.Radome is permissible Using metal material.
Hood 1, the first insulating ceramics 2, the first radome 3, secondary shielding cover 4, the second insulating ceramics 5 and the 3rd shielding Cover 6 has the central through hole of same diameter, is matched with screw 7 external diameter in the aperture of this central through hole.
Hood 1 and the first radome 3 are arranged on the first insulating ceramics 2 two ends, secondary shielding cover 4 and the 3rd radome 6 It is separately mounted at the step of two-part the second insulating ceramics 5 and big section end, then the boss of the second insulating ceramics 5 passes through Electrode x is fitted together with the shrinkage pool positioning of the first insulating ceramics 2.Finally hood 1, first is sequentially passed through using screw 7 exhausted Edge pottery 2, the first radome 3, electrode x, secondary shielding cover 4, the second insulating ceramics 5, the 3rd radome 6, electrode y and nut 8 After be screwed together, realize the electric insulation between Different electrodes.
In order to form labyrinth structure, the present invention is directed to each radome especially first radome 3 and secondary shielding cover 4 enters Gone particular design so that by the formation labyrinth structure nested against one another of each radome.Ensureing enough clearance for insulations (l1) In the case of the maximized outer drain surface covering two insulating ceramicses, make the sputtering to insulating ceramics surface for the metal sputtering product Deposition pollution greatly reduces, it is to avoid the phenomenon that the insulating capacity being caused due to ceramic pollution is declined.For this each building block Concrete structure be:
First insulating ceramics 2 and the second insulating ceramics 5 are cylindrical structural, on the first insulating ceramics 2 end face in Heart shrinkage pool 21 is matched with the central boss 51 on the second insulating ceramics 5 end face.
As shown in Fig. 2 the first radome 3 is the cylinder with annular bottom surface, its inner bottom surface is had with the corner of medial surface There is a step surface a 31, the inner bottom surface of this first radome 3 and step surface a 31 collectively form annular right-angle locating surface a.First The outer rim on insulating ceramics 2 with the end face of central pit hole 21 is placed at annular right-angle locating surface a, and in annular right-angle positioning Carry out soldering at a of face, thus will be fixing to the first insulating ceramics 2 and the first radome 3, form first assembly.Here, step surface a 31 purpose of design has two, and one is that form right angle face is used for being formed structure positioning, two be an up the barrel of the first radome 3 with Distance on first insulating ceramics 2, thus on the basis of as far as possible increasing shielding surface, can increase clearance for insulation l1 away from From thus increasing reliability.
As shown in figure 3, secondary shielding cover 4 is notch cuttype two-part cylinder.The external corner of the interior joint face 41 of segment and big section Place forms annular right-angle locating surface b 42, has a step surface b 43, the interior joint face 41 of segment and big section and step at inner corner trim Face b 43 collectively forms annular right-angle locating surface c 44.Second insulating ceramics 5 is because the presence of boss is so as to have a step Face, secondary shielding cover 4 is socketed at the step surface of the second insulating ceramics 5, and the inner corner trim of this step surface and external corner are straight with annular respectively Angle locating surface b contacts with annular right-angle locating surface c, and carries out pricker at annular right-angle locating surface b and annular right-angle locating surface c Weldering, thus will be fixing to the second insulating ceramics 5 and secondary shielding cover 4.Here, the purpose of design of step surface b 43 has two, and one is Form right angle face is used for being formed structure positioning, and two are an up the distance on the barrel and the second insulating ceramics 5 of secondary shielding cover 4, Thus on the basis of increasing shielding surface, the distance of clearance for insulation l1 can be increased, thus increasing reliability as far as possible.
3rd radome 6 is the cylinder with annular bottom surface, is arranged on the second insulating ceramics 5 and is not provided with central boss 51 End face, and formed in the 3rd radome 6 inner bottom surface and medial surface and carry out soldering at annular right-angle locating surface d 61, thus by the Two insulating ceramicses 5 and the 3rd radome (6) are fixing.Secondary shielding cover 4, the second insulating ceramics 5 and the 3rd radome 6 form second Assembly.
Above-mentioned first radome 3, secondary shielding cover 4, the 3rd radome 6 and the first insulating ceramics 2, the second insulating ceramics 5 It is connected using soldering processes in order to be increased the drag ability of insulation assembly, it is to avoid it occurs in mechanical test Scaling-off, phenomenon of rupture.Its assembling need to ensure the fit-up gap of 0.15mm~0.25mm, full to ensure that brazing solder can be filled Full, solder adopts pure ag solder, welding temperature >=900 DEG C.
As shown in figure 4, hood 1 is the cylinder with annular bottom surface, annular bottom surface has going out of connection central through hole Air drain 11.After installation, the gas in two insulating ceramics fit-up gap l2 can effectively be discharged it is therefore prevented that occurring locally low at l2 The environment of air pressure, effectively reduces the risk of low pressure discharge between two electrodes, is conducive to the steady operation of electric thruster.The present embodiment In, the groove of a long 4.5mm width 1mm is opened at hood top.
During installation, together with hood 1, first assembly, electrode x, the second assembly are arranged in order with electrode y, using bolt 7 Central through hole through each assembly is spirally connected with nut 8.After being spirally connected, hood 1 is arranged on the first insulating ceramics 2 and does not set central pit hole End face outside, the central boss 51 of the second insulating ceramics 5 passes through electrode x and the first radome 3 to stretch in the first insulating ceramics 2 In heart shrinkage pool 21, secondary shielding cover 4 segment only stretches into electrode x, stretches into the thickness that distance is less than electrode x;First radome 3 He Secondary shielding cover 4 is located at the both sides of electrode x;3rd radome 6 contacts electrode y.
With bolt axially as reference, there is between hood 1 and the first radome 3 axially spaced-apart, secondary shielding cover 4 and Between three radomes 6, also there is axially spaced-apart.Axially spaced-apart is ensured by the size design of each radome.
Combined by above-mentioned installation, secondary shielding cover 4 and the 3rd radome 6 form labyrinth knot by way of nested against one another Structure, the maximized outer drain surface covering the second insulating ceramics 5 in the case of ensureing enough clearance for insulation l1, so that metal is splashed Penetrate product the pollution of the sputtering sedimentation on insulating ceramics surface is greatly reduced, it is to avoid the insulating capacity causing due to ceramic pollution The phenomenon declining.
In order to ensure insulation assembly in electric thruster between two electrodes can right angle setting, prevent due to tilt installation cause absolutely Edge assembly stress damaged in addition it is also necessary to 4 two sections of secondary shielding cover of design outer joint face 45 (the radial direction binding face with electrode x, referring to It is Fig. 5) 0.02mm with the depth of parallelism of the 3rd radome 6 bottom surface outer surface, the 3rd radome 6 bottom surface outer surface has 0.02mm's Flatness.
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 electric thruster insulation assembly of Anti-splash labyrinth structure, for the electrode x of different potentials in electric thruster and Electrode y carries out insulating mounting;It is characterized in that, this insulation assembly includes: have same diameter central through hole hood (1), First insulating ceramics (2), the first radome (3), secondary shielding cover (4), the second insulating ceramics (5) and the 3rd radome (6), also Including screw (7) and nut (8);
First insulating ceramics (2) and the second insulating ceramics (5) are cylindrical structural, on the first insulating ceramics (2) end face Central pit hole (21) is matched with the central boss (51) on the second insulating ceramics (5) end face;
First radome (3) is the cylinder with annular bottom surface, and its inner bottom surface has a step surface a with the corner of medial surface (31), the inner bottom surface of this first radome (3) and step surface a (31) collectively form annular right-angle locating surface a;First insulating ceramics (2) outer rim on the end face of central pit hole (21) is placed at annular right-angle locating surface a, and in annular right-angle locating surface a Place carries out soldering, thus the first insulating ceramics (2) is fixing with the first radome (3), form first assembly;
Secondary shielding cover (4) is notch cuttype two-part cylinder;Form annular at segment and the external corner of interior joint face (41) of big section Right angle locating surface b (42), has a step surface b (43), the interior joint face (41) of segment and big section and step surface b (43) at inner corner trim Collectively form annular right-angle locating surface c (44);Secondary shielding cover (4) is socketed at the step surface of the second insulating ceramics (5), and this The inner corner trim of step surface of two insulating ceramicses (5) is contacted with annular right-angle locating surface b and annular right-angle locating surface c respectively with external corner, And carry out soldering at annular right-angle locating surface b and annular right-angle locating surface c, thus by the second insulating ceramics (5) and the second screen Cover cover (4) fixing;
3rd radome (6) is the cylinder with annular bottom surface, is arranged on the second insulating ceramics (5) and is not provided with central boss (51) End face, and form annular right-angle locating surface d (61) place in the 3rd radome (6) inner bottom surface and medial surface and carry out soldering, from And the second insulating ceramics (5) is fixing with the 3rd radome (6);Secondary shielding cover (4), the second insulating ceramics (5) and the 3rd screen Cover cover (6) and form the second assembly;
Hood (1) is the cylinder with annular bottom surface, and annular bottom surface has the outgassing groove (11) of connection central through hole;
Together with hood (1), first assembly, electrode x, the second assembly are arranged in order with electrode y, institute is passed through using bolt (7) State central through hole to be spirally connected with nut (8);After being spirally connected, hood (1) is arranged on the first insulating ceramics (2) and does not set the one of central pit hole Outside end face, the central boss (51) of the second insulating ceramics (5) passes through electrode x and the first radome (3) to stretch into the first insulating ceramics (2), in central pit hole (21), the segment of secondary shielding cover (4) stretches into electrode x, stretches into the thickness that distance is less than electrode x;The One radome (3) and secondary shielding cover (4) are positioned at the both sides of electrode x;3rd radome (6) contact electrode y;
With bolt axially as reference, there is between hood (1) and the first radome (3) axially spaced-apart, secondary shielding cover (4) with Between 3rd radome (6), also there is axially spaced-apart.
2. the electric thruster insulation assembly of Anti-splash labyrinth structure as claimed in claim 1 is it is characterised in that described second screen The depth of parallelism of the outer joint face (45) and the 3rd radome (6) bottom surface outer surface that cover (4) two sections of cover is 0.02mm, the 3rd radome (6) bottom surface outer surface has the flatness of 0.02mm.
3. the electric thruster insulation assembly of Anti-splash labyrinth structure as claimed in claim 1 is it is characterised in that have at soldering The fit-up gap of 0.15mm~0.25mm.
CN201510409678.XA 2015-07-13 2015-07-13 Electric thruster insulation assembly having anti-sputtering labyrinth structure CN105070425B (en)

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CN106340360B (en) * 2016-08-31 2017-11-03 兰州空间技术物理研究所 A kind of electric thruster superelevation Electric insulator of resistance to pressure gas channel
EP3402027B1 (en) * 2017-05-08 2020-12-09 ABB Power Grids Switzerland AG High-voltage insulator arrangement for insulation of a conductor of a dc gas-insulated system, and gas-insulated system for dc operation comprising a high-voltage insulator arrangement
CN109712861A (en) * 2018-12-25 2019-05-03 哈工大机器人(岳阳)军民融合研究院 A kind of ion-optic system of anti-short-circuit function and minitype ion source

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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
CN104317371B (en) * 2014-10-31 2017-07-07 山东超越数控电子有限公司 A kind of ruggedized computer with labyrinth type electromagnetic armouring structure

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