CN112700933A - Gas path insulator and manufacturing method thereof - Google Patents

Gas path insulator and manufacturing method thereof Download PDF

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Publication number
CN112700933A
CN112700933A CN202110030036.4A CN202110030036A CN112700933A CN 112700933 A CN112700933 A CN 112700933A CN 202110030036 A CN202110030036 A CN 202110030036A CN 112700933 A CN112700933 A CN 112700933A
Authority
CN
China
Prior art keywords
pipe plug
ceramic pipe
insulator
ceramic
end cover
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110030036.4A
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Chinese (zh)
Inventor
祁治珲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sichuan Kaisaide Technology Co ltd
Original Assignee
Sichuan Kaisaide Technology Co ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sichuan Kaisaide Technology Co ltd filed Critical Sichuan Kaisaide Technology Co ltd
Priority to CN202110030036.4A priority Critical patent/CN112700933A/en
Publication of CN112700933A publication Critical patent/CN112700933A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B17/00—Insulators or insulating bodies characterised by their form
    • H01B17/56—Insulating bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64G—COSMONAUTICS; VEHICLES OR EQUIPMENT THEREFOR
    • B64G1/00—Cosmonautic vehicles
    • B64G1/22—Parts of, or equipment specially adapted for fitting in or to, cosmonautic vehicles
    • B64G1/52—Protection, safety or emergency devices; Survival aids
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B37/00—Joining burned ceramic articles with other burned ceramic articles or other articles by heating
    • C04B37/02—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles
    • C04B37/023—Joining burned ceramic articles with other burned ceramic articles or other articles by heating with metallic articles characterised by the interlayer used
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/02—Aspects relating to interlayers, e.g. used to join ceramic articles with other articles by heating
    • C04B2237/12—Metallic interlayers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2237/00—Aspects relating to ceramic laminates or to joining of ceramic articles with other articles by heating
    • C04B2237/50—Processing aspects relating to ceramic laminates or to the joining of ceramic articles with other articles by heating
    • C04B2237/52—Pre-treatment of the joining surfaces, e.g. cleaning, machining

Abstract

The invention discloses a gas path insulator and a manufacturing method thereof; the gas path insulator comprises a main insulator made of ceramics, and an A ceramic pipe plug and a B ceramic pipe plug which are alternately arranged in the main insulator, wherein the upper end and the lower end of the main insulator are respectively provided with an upper end cover and a lower end cover which are used for tightly pressing the A ceramic pipe plug and the B ceramic pipe plug in the main insulator. When given voltage is applied to two ends of the gas path insulator, the voltage on the gas in unit length is reduced by the bent gas channel, and meanwhile, due to the fact that the channel is slender and bent, electrons move for a short distance and collide with the channel wall, and sufficient energy cannot be obtained to enable gas molecules to be ionized; under the combined action of the two factors, the gas path insulator not only can ensure the circulation of gas, but also can play the role of electrical insulation.

Description

Gas path insulator and manufacturing method thereof
Technical Field
The invention relates to the technical field of gas discharge, in particular to a gas path insulator and a manufacturing method thereof.
Background
The electric propulsion system of the spacecraft burns the inert gas working medium to generate thrust, the storage tank for storing the inert gas working medium and the thrust unit are often not at the same electric potential, and therefore the electric insulation between the thrust unit and the storage tank is ensured while the gas with a certain flow rate is supplied to the thrust unit. Generally, the thrust unit and the storage tank have a potential difference of several hundreds to several thousands of volts, and even if non-conductive gas pipelines such as plastic pipes and ceramic pipes are adopted, the gas in the pipelines can generate gas breakdown discharge under the action of high voltage. Once gas breakdown occurs in the pipeline, high-density plasma is generated in the pipeline, and the thrust unit and the storage tank are in a short circuit or semi-short circuit state, so that the thrust unit cannot work normally and even the whole spacecraft is paralyzed. The gas path insulator has the functions of ensuring gas supply, preventing gas from breakdown and discharging and playing a role in electrical insulation. The electric thrusters at home and abroad adopt gas circuit electric insulators with different structures to realize gas circuit electric isolation. For example, XIPS-25 and NSTAR-30 ion thrusters in the United states adopt a gas path electric insulator with a multi-stage segmentation structure, and a 40cm ion thruster in the NEXT plan in the United states adopts a gas path insulator with a porous structure filled with micro spherical alumina ceramic particles. However, the existing gas path insulator is prone to structural failure under the condition that the given working voltage, gas flow rate and the like of the thruster are guaranteed.
Disclosure of Invention
Based on the defects of the prior art, the invention discloses a gas path insulator which is firm in structure and convenient to manufacture, can ensure that the thruster does not fail under the conditions of given working voltage, gas flow rate and the like, and can reliably inhibit gas breakdown discharge.
In order to achieve the purpose, the invention adopts the following technical scheme: the gas path insulator comprises a main insulator made of ceramics, an A ceramic pipe plug and a B ceramic pipe plug which are alternately arranged in the main insulator, wherein the upper end and the lower end of the main insulator are respectively provided with an upper end cover and a lower end cover which are used for tightly pressing the A ceramic pipe plug and the B ceramic pipe plug in the main insulator.
As a further description of the above technical solution:
the upper end cover and the lower end cover are respectively connected with the main insulator by adopting a ceramic-metal sealing technology to realize airtight connection, and the ceramic pipe plug A and the ceramic pipe plug B are laminated and tightly pressed in the main insulator.
As a further description of the above technical solution:
and the other ends of the upper end cover and the lower end cover are provided with proper pipeline joints according to use requirements so as to be connected with a pipeline of the air path.
As a further description of the above technical solution:
the upper end cover and the lower end cover are made of metal materials.
As a further description of the above technical solution:
the ceramic pipe plug A and the ceramic pipe plug B are both made of ceramic materials.
As a further description of the above technical solution:
one surface of the ceramic pipe plug A and the ceramic pipe plug B is carved with a channel, and the other surface is a plane.
As a further description of the above technical solution:
the channel surface of the ceramic pipe plug A is in contact with the plane of the ceramic pipe plug B, and the channel surface of the ceramic pipe plug B is in contact with the plane of the ceramic pipe plug A.
As a further description of the above technical solution:
the center of the A ceramic pipe plug is provided with a first vent hole.
As a further description of the above technical solution:
and a second vent hole is formed in the edge of the ceramic pipe plug B.
As a further description of the above technical solution:
the ceramic pipe plugs A and the ceramic pipe plugs B are alternately overlapped according to the sequence of … ABABABA …, and after the overlapping, the channel surface of any one ceramic pipe plug is attached to the plane of the other ceramic pipe plug to form a gas channel. The number of layers of lamination is determined by the operating voltage. When the ceramic pipe plugs A and the ceramic pipe plugs B are overlapped alternately, the first vent holes, the second vent holes, the channels and the inner wall of the main insulator form a slender and zigzag gas channel together.
A method for manufacturing the gas path insulator comprises the following steps:
(1) grinding the main insulating ceramic tube 1 into a required size and then carrying out ceramic metallization treatment;
(2) grinding and polishing the upper and lower surfaces and the side surfaces of the ceramic pipe plug A and the ceramic pipe plug B, respectively drilling a first vent hole and a second vent hole in the center and the edge, and then pressing and molding the channels of the ceramic pipe plug A and the ceramic pipe plug B by a mold when a ceramic blank is pressed;
(3) combining the upper end cover, the lower end cover, the main insulator and the pipe plug together, placing a welding flux at the sealing part, fixing the sealing part into a brazing tool fixture, and finishing brazing according to a brazing process.
The invention has the following beneficial effects:
when given voltage is applied to two ends of the gas path insulator, the voltage on the gas in unit length is reduced by the bent gas channel, and meanwhile, due to the fact that the channel is slender and bent, electrons move for a short distance and collide with the channel wall, and sufficient energy cannot be obtained to enable gas molecules to be ionized; under the combined action of the two factors, the gas path insulator not only can ensure the circulation of gas, but also can play the role of electrical insulation.
From the manufacturing point of view, the gas circuit insulator can adopt mature ceramic materials and ceramic-metal sealing technology, has low process difficulty and high strength, and can bear thermal shock and force impact required by spacecraft application.
Drawings
FIG. 1 is a schematic structural diagram of a gas path insulator according to the present disclosure;
FIG. 2 is a schematic structural view of a ceramic plug A;
FIG. 3 is a schematic structural diagram of a ceramic plug B;
FIG. 4 is a schematic structural diagram of an example disclosed in the present invention;
FIG. 5 is a schematic structural view of an example of a ceramic plug A of the present disclosure;
FIG. 6 is a schematic structural diagram of an example of a B ceramic pipe plug disclosed in the present invention.
Reference numerals:
1-main insulating ceramic tube; 2-A ceramic pipe plug; 3-B ceramic pipe plug; 4-upper end cover; 5-lower end cap; 6-a channel; 7-a first vent; 8-second vent.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and furthermore, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-3, an air path insulator comprises a main insulator 1 made of ceramic, a ceramic pipe plug a2 and a ceramic pipe plug B3 alternately arranged inside the main insulator, wherein the upper end and the lower end of the main insulator 1 are respectively provided with an upper end cover and a lower end cover which tightly press the ceramic pipe plug a2 and the ceramic pipe plug B3 in the main insulator 1; the upper end cover 4 and the lower end cover 5 are respectively connected with the main insulator 1 by adopting a ceramic-metal sealing technology to realize airtight connection, and the ceramic pipe plug A2 and the ceramic pipe plug B3 are tightly laminated in the main insulator 1; the other ends of the upper end cover 4 and the lower end cover 5 are provided with proper pipeline joints according to use requirements so as to be connected with a pipeline of an air path; the upper end cover 4 and the lower end cover 5 are made of metal materials; the ceramic pipe plug 2A and the ceramic pipe plug 3B are both made of ceramic materials; one surfaces of the ceramic pipe plug 2A and the ceramic pipe plug 3B are carved with channels, and the other surfaces are planes; the channel surface of the ceramic pipe plug 2A is contacted with the plane of the ceramic pipe plug 3B, and the channel surface of the ceramic pipe plug 3B is contacted with the plane of the ceramic pipe plug 2A; a first vent hole 7 is formed in the center of the ceramic pipe plug A2; and a second vent hole 8 is formed in the edge of the ceramic pipe plug 3B.
In this embodiment, the a ceramic plugs 2 and the B ceramic plugs 3 are alternately stacked in the order of … A2B3A2 …, and after stacking, the channel surface of one of the ceramic plugs is bonded to the flat surface of the other ceramic plug, thereby forming a gas channel. The number of layers of lamination is determined by the operating voltage. When the A ceramic pipe plug 2 and the B ceramic pipe plug 3 are overlapped alternately, the first vent hole 7, the second vent hole 8, the channel 6 and the inner wall of the main insulator 1 form a slender and tortuous gas channel together.
A method for manufacturing the gas path insulator comprises the following steps:
(1) grinding the main insulating ceramic tube 1 into a required size and then carrying out ceramic metallization treatment;
(2) grinding and polishing the upper and lower surfaces and the side surfaces of the ceramic pipe plug 2A and the ceramic pipe plug 3B, drilling a first vent hole 7 and a second vent hole 8 at the center and the edge respectively, and then pressing and molding the channels of the ceramic pipe plug 2A and the ceramic pipe plug 3B by a mold when a ceramic blank is pressed;
(3) combining the upper end cover, the lower end cover, the main insulator and the pipe plug together, placing a welding flux at the sealing part, fixing the sealing part into a brazing tool fixture, and finishing brazing according to a brazing process.
Examples
As shown in fig. 4 to 6, the gas path insulator of the present example is composed of a main insulating ceramic tube 1, 2 a ceramic plugs 2, 1B ceramic plug 3, an upper end cap 4, and a lower end cap 5. The concrete structure is as follows: the gas path insulator is a vacuum sealed container with gas path connecting joints at two ends formed by a main insulator 1 made of ceramics and two metal end covers 4 and 5 through a ceramic-metal sealing technology, and 2 ceramic pipe plugs A2 and a ceramic pipe plug B3 inside are pressed inside the main insulator 1 by the end covers according to the sequence of the ceramic pipe plugs A, the ceramic pipe plugs B and the ceramic pipe plugs A. And gaps among the first vent hole 7 of the ceramic pipe plug A2, the channel 6, the second vent hole 8 of the ceramic pipe plug B3, the chamfer angles of the ceramic pipe plug A and the ceramic pipe plug B and the inner wall of the main insulator 1 form a gas circulation channel.
The manufacturing process of this example is as follows: grinding the main insulating ceramic tube 1 into a required size and then carrying out ceramic metallization treatment; and grinding and polishing the upper and lower surfaces and the side surfaces of the ceramic pipe plug A and the ceramic pipe plug B, respectively drilling a first vent hole 7 and a second vent hole 8 at the center and the edge, and pressing and molding the channels of the A, B ceramic pipe plugs by a mold when a ceramic blank is pressed. The end cap, the main insulator and the plug are assembled together as shown in fig. 5, and are fixed in a brazing tool after the solder is placed at the sealing part, and the brazing is completed according to the brazing process.
The gas path insulator has the advantages that the manufacturing process is simple, the pipe plug and the main insulator porcelain pipe can be made of ceramic materials with the same components and sintering process, the thermal expansion coefficients are the same, and the good temperature impact resistance of the gas path insulator can be guaranteed. The ceramic-metal sealing process is mature, and the mechanical strength of the sealing piece is high. Therefore, the gas path insulator of the embodiment meets the use requirement of the electric thruster.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (10)

1. The utility model provides a gas circuit insulator which characterized in that: the ceramic pipe plug comprises a main insulator made of ceramic, and an A ceramic pipe plug and a B ceramic pipe plug which are alternately arranged in the main insulator, wherein the upper end and the lower end of the main insulator are respectively provided with an upper end cover and a lower end cover which are used for tightly pressing the A ceramic pipe plug and the B ceramic pipe plug in the main insulator.
2. The gas path insulator of claim 1, wherein: the upper end cover and the lower end cover are respectively sealed with the main insulator by adopting a ceramic-metal sealing technology.
3. A gas path insulator as claimed in claim 2, wherein: and the other ends of the upper end cover and the lower end cover are provided with pipeline joints for connecting with a pipeline of the gas circuit.
4. A gas path insulator as claimed in claim 3, wherein: the upper end cover and the lower end cover are made of metal materials.
5. The gas path insulator of claim 1, wherein: one surface of the ceramic pipe plug A and the ceramic pipe plug B is carved with a channel, and the other surface is a plane.
6. The gas path insulator of claim 5, wherein: the channel surface of the ceramic pipe plug A is in contact with the plane of the ceramic pipe plug B, and the channel surface of the ceramic pipe plug B is in contact with the plane of the ceramic pipe plug A.
7. The gas path insulator of claim 6, wherein: the center of the A ceramic pipe plug is provided with a first vent hole.
8. The gas path insulator of claim 7, wherein: and a second vent hole is formed in the edge of the ceramic pipe plug B.
9. The gas path insulator of claim 1, wherein: and the ceramic pipe plugs A and the ceramic pipe plugs B are alternately overlapped in sequence, and after the overlapping, the channel surface of any one ceramic pipe plug is attached to the plane of the other ceramic pipe plug to form a gas channel.
10. A method for manufacturing a gas path insulator according to any one of claims 1 to 9, comprising the steps of:
(1) grinding the main insulating ceramic tube 1 into a required size and then carrying out ceramic metallization treatment;
(2) grinding and polishing the upper and lower surfaces and the side surfaces of the ceramic pipe plug A and the ceramic pipe plug B, respectively drilling a first vent hole and a second vent hole in the center and the edge, and then pressing and molding the channels of the ceramic pipe plug A and the ceramic pipe plug B by a mold when a ceramic blank is pressed;
(3) combining the upper end cover, the lower end cover, the main insulator and the pipe plug together, placing a welding flux at the sealing part, fixing the sealing part into a brazing tool fixture, and finishing brazing according to a brazing process.
CN202110030036.4A 2021-01-11 2021-01-11 Gas path insulator and manufacturing method thereof Pending CN112700933A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110030036.4A CN112700933A (en) 2021-01-11 2021-01-11 Gas path insulator and manufacturing method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110030036.4A CN112700933A (en) 2021-01-11 2021-01-11 Gas path insulator and manufacturing method thereof

Publications (1)

Publication Number Publication Date
CN112700933A true CN112700933A (en) 2021-04-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110030036.4A Pending CN112700933A (en) 2021-01-11 2021-01-11 Gas path insulator and manufacturing method thereof

Country Status (1)

Country Link
CN (1) CN112700933A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113357113A (en) * 2021-07-02 2021-09-07 兰州空间技术物理研究所 Air supply and insulation integrated structure of space electric thruster

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113357113A (en) * 2021-07-02 2021-09-07 兰州空间技术物理研究所 Air supply and insulation integrated structure of space electric thruster

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