CN110778472A

CN110778472A - Hall thruster compresses tightly assembly structure

Info

Publication number: CN110778472A
Application number: CN201911060016.0A
Authority: CN
Inventors: 李鸿; 丁永杰; 魏立秋; 于达仁; 刘星宇
Original assignee: Harbin Institute of Technology
Current assignee: Harbin Institute of Technology
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-02-11
Anticipated expiration: 2039-11-01
Also published as: CN110778472B

Abstract

The invention provides a Hall thruster compressing and assembling structure, wherein an anode stud of the compressing and assembling structure sequentially penetrates through a ceramic channel, a bottom plate and an insulator mounting hole, a compression nut and the anode stud are matched and compressed on the lower surface of an insulator, and an anode and the compression nut are matched to compress the ceramic channel, the insulator and the bottom plate; the end faces of the compression section and the assembling thread section of the compression nut are concentric ring end faces, the assembling thread section is in threaded fit with the stud below the anode, the inner diameter of the assembling thread section is equal to the outer diameter of the stud of the anode, and the outer diameter of the compression section is equal to the outer diameter of the bottom face of the insulator. The problem of when current hall thrustor assembles the insulator bear the too big breakable shearing force, and then influence its overall structure reliability and operational reliability is solved, a hall thrustor compresses tightly assembly structure is proposed, adopts gland nut can compress tightly fixed such as positive pole, ceramic channel, bottom plate and insulator, can reduce the shearing force effect that the insulator receives by a wide margin, improves the thrustor reliability.

Description

Hall thruster compresses tightly assembly structure

Technical Field

The invention relates to a Hall thruster compressing and assembling structure, and belongs to the field of electric propulsion Hall thrusters.

Background

The Hall thruster is a power device which utilizes orthogonal electromagnetic fields to ionize and accelerate working media so as to convert electric energy into kinetic energy. The spacecraft attitude control system has the advantages of simple structure, high efficiency, long service life and the like, is suitable for tasks of attitude control, orbit correction, position maintenance, deep space exploration and the like of various spacecrafts, and is one of the research hotspots in the electric propulsion field at home and abroad at present. The hall thruster is one of the electric thrusters which are internationally mature at present, and the hall thruster enters the stage of on-rail application generally, so that the reliability of the on-rail application is concerned.

The stress distribution of each structural component during the working period of the Hall thruster can influence the reliability of the structure and further influence the reliability of the whole machine. In the traditional Hall thruster assembling process, an anode-gas distributor, a ceramic channel and an insulator are fixed in an assembling structure on a bottom plate, and an anode stud or an air guide column is matched with a nut to play a role of a bolt and is used for connecting and fixing the ceramic channel, the bottom plate and the insulator. The connecting piece is provided with a through hole, the anode stud is inserted into the through hole at one time, the other end of the anode stud is screwed with a nut, and a disc spring is used for providing pretightening force. At this moment, the pre-tightening fit between the stud and the nut provides pressure along the axial direction between the connected pieces, wherein the front end face of the insulator is subjected to backward axial pressure provided by the bottom plate and acts on the outermost side position of the insulator, the rear end face of the insulator is subjected to forward axial pressure provided by the nut and the disc spring and acts on the inner side of the insulator, so that the shearing force is formed, the insulator is made of ceramic, the ceramic is pressure-resistant but weak in capability of resisting the shearing force, the shearing force is fragile, and the reliability of the working of the thruster is influenced. Therefore, the assembly structure needs to be specially designed to reduce the shearing force borne by the insulator and further improve the reliability of the insulator.

Disclosure of Invention

The invention provides a pressing assembly structure of a Hall thruster, which aims to solve the problems that when the existing Hall thruster is assembled, an insulator bears too large shearing force and is fragile, and the reliability of the whole structure and the working reliability of the existing Hall thruster are affected.

In order to achieve the purpose, the invention provides a Hall thruster compressing and assembling structure which comprises an anode, a ceramic channel, a bottom plate, an insulator and a compression nut, wherein the section of the anode at the installation position is T-shaped, studs of the anode sequentially penetrate through installation holes of the ceramic channel, the bottom plate and the insulator, the compression nut and the studs of the anode are matched and compressed on the lower surface of the insulator, and the anode and the compression nut are matched to compress the ceramic channel, the insulator and the bottom plate; the compression nut is divided into a compression section and an assembly thread section, the end faces of the compression section and the assembly thread section are concentric ring end faces, the assembly thread section is in threaded fit with a stud below an anode, the inner diameter of the assembly thread section is equal to the outer diameter of the stud of the anode, the outer diameter of the compression section is equal to the outer diameter of the bottom face of the insulator, so that the pressure on the upper end face and the lower end face of the insulator can be completely opposite, the compression section acts on the same straight line, the shearing force formed by the stress dislocation of the upper end face and the lower end face on the insulator is reduced, and the.

The working principle of the Hall thruster compressing and assembling structure provided by the invention is as follows:

the invention relates to a Hall thruster compressing assembly structure, which designs a new compression nut to replace a standard nut in the traditional assembly method, and comprises an assembly thread section and a compression section which are connected into a whole, belonging to a concentric revolving body structure.

The Hall thruster compressing and assembling structure has the beneficial effects that:

according to the Hall thruster compressing assembly structure, the newly designed compression nut is adopted to replace a standard nut in an original assembly structure, the structures such as an anode (gas distributor), a ceramic channel, a bottom plate and an insulator can be fixedly compressed, the shearing force applied to the insulator can be greatly reduced, the insulator structure is protected, and the application reliability of the thruster is improved.

Drawings

Fig. 1 is a schematic structural diagram of a conventional hall thruster compressing assembly structure;

FIG. 2 is a schematic diagram of a compressing and assembling structure of the Hall thruster according to the present invention;

FIG. 3 is a schematic perspective view of a compression nut according to the present invention;

FIG. 4 is an ANSYS software analysis chart of the shearing force applied to the insulator with the standard nut structure;

FIG. 5 is an ANSYS software analysis of the shear force experienced by the compression nut construction insulator;

FIG. 6 is an ANSYS software analysis of equivalent stress experienced by a standard nut construction insulator;

FIG. 7 is an ANSYS software analysis of the equivalent stress experienced by a compression nut structural insulator;

in the figure: 1-anode (gas distributor); 2-a ceramic channel; 3-a bottom plate; 4, an insulator; 5-pressing the nut; 6-a compacting section; 7-assembling the thread section.

Detailed Description

The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:

the first embodiment is as follows: the present embodiment is explained with reference to fig. 1. The pressing and assembling structure of the hall thruster comprises an anode 1, a ceramic channel 2, a bottom plate 3, an insulator 4 and a pressing nut 5, wherein the cross section of the anode 1 at the installation position is in a T shape, studs of the anode 1 sequentially penetrate through installation holes of the ceramic channel 2, the bottom plate 3 and the insulator 4, the pressing nut 5 and the studs of the anode 1 are matched and pressed on the lower surface of the insulator 4, and the anode 1 and the pressing nut 5 are matched to press the ceramic channel 2 and the insulator 4 with the bottom plate 3;

the compression nut 5 is divided into a compression section 6 and an assembly thread section 7, the end faces of the compression section 6 and the assembly thread section 7 are concentric ring end faces, the assembly thread section 7 is in threaded fit with a stud below the anode 1, the inner diameter of the assembly thread section 7 is equal to the outer diameter of the stud of the anode 1, the outer diameter of the compression section 6 is equal to the outer diameter of the bottom face of the insulator 4, so that the pressure on the upper end face and the lower end face of the insulator 4 can be completely opposite, the compression section acts on the same straight line, the shearing force formed by the upper end face and the lower end face in stress dislocation on the insulator 4 is reduced, and the compression section 6.

As shown in fig. 1 to 3, the hall thruster compressing assembly structure of the present embodiment designs a new compression nut to replace a standard nut in an original conventional assembly structure, and includes an assembly thread section 7 and a compression section 6 connected as a whole, and end faces of the two sections are concentric ring end faces and have a small inner diameter and a large outer diameter, respectively.

The hall thruster pressing assembly structure according to the present embodiment can fix the anode (gas distributor) 1, the ceramic passage 2, and the insulator 4 to the assembly structure on the base plate 3. The concrete process is that the stud of the anode (gas distributor) 1 respectively passes through the ceramic channel 2 and the mounting hole of the bottom plate 3, the stud passes through the insulator 4 after passing through the bottom plate 3, and then the axial position is fixed by the compression nut 5.

When the compression nut related to the embodiment is designed, the assembling thread section 7 keeps a small inner diameter to match a stud, the inner diameter of the assembling thread section is kept to be 5mm same as that of a standard nut, and the compression section 6 has a large outer diameter to transfer the action position of the compression nut 5 on the insulator 4.

The inner diameter and the outer diameter of the compression section 6 are determined according to the structural size of the action positions of the insulator 4 and the thruster bottom plate 3, the inner diameter and the outer diameter of the end face of the compression section 6 are kept consistent with the inner diameter and the outer diameter of the action positions of the insulator 4 and the thruster bottom plate 3, so that the pressure on the upper end face and the lower end face of the insulator 4 can be completely opposite to each other, the compression is acted on the same straight line, the action of shearing force is reduced, the structure of the insulator 4 is protected, and the reliability of the thruster is.

In this embodiment, a structure size of a kW-level hall thruster with a channel caliber of 100mm is taken as an example to describe a pressing and assembling structure of the hall thruster. In order to illustrate the effect of reducing the shearing force applied to the insulator by the Hall thruster compressing and assembling method, through ANSYS software analysis and comparison, as can be seen by comparing fig. 4 and 5, under the same constraint condition, the concentrated stress positions on the two sides of the insulator 4 in the standard nut structure are staggered, the shearing force obliquely penetrates through the outer edge of the hexagon nut and the inner edge of the bottom plate, the concentrated stress positions on the upper side and the lower side of the insulator in the compression nut 5 structure are better corresponding, the shearing stress on the insulator 4 is reduced by 86%, and therefore the torque generated on the insulator 4 is smaller. Although the maximum shearing stress in the structure of the compression nut 5 is not reduced, a large shearing force acts on the compression nut 5, and the compression nut 5 is made of stainless steel and has strong shearing resistance.

Comparing fig. 6 and fig. 7, it can be seen that under the same constraint, the maximum stress applied to the insulator 4 by using the compression nut 5 is 71.8% smaller. Therefore, the insulator 4 can be better protected by replacing the standard nut with the compression nut 5 from the viewpoint of safety and reliability.

The above-mentioned embodiments further explain the objects, technical solutions and advantages of the present invention in detail. It should be understood that the above-mentioned embodiments are only examples of the present invention, and are not intended to limit the present invention, and that the reasonable combination of the features described in the above-mentioned embodiments can be made, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The Hall thruster compressing and assembling structure is characterized by comprising an anode (1), a ceramic channel (2), a bottom plate (3), an insulator (4) and a compression nut (5), wherein the cross section of the anode (1) at the installation position is T-shaped, studs of the anode (1) sequentially penetrate through installation holes of the ceramic channel (2), the bottom plate (3) and the insulator (4), the compression nut (5) and the studs of the anode (1) are matched and compressed on the lower surface of the insulator (4), and the anode (1) and the compression nut (5) are matched to compress the ceramic channel (2) and the insulator (4) with the bottom plate (3);

gland nut (5) divide into and compress tightly section (6) and assembly screw thread section (7), the terminal surface that compresses tightly section (6) and assembly screw thread section (7) is concentric ring terminal surface, assembly screw thread section (7) and the double-screw bolt screw-thread fit of positive pole (1) below, the internal diameter of assembly screw thread section (7) equals with the double-screw bolt external diameter of positive pole (1), the bottom surface external diameter that compresses tightly section (6) external diameter and insulator (4) equals for both ends face stress can be relative completely about insulator (4), acts on same straight line, and the shearing force that terminal surface atress dislocation formed insulator (4) about the reduction, it compresses tightly on the lower surface of insulator (4) to compress tightly section (6).