CN115673760A - High-precision assembling tool and method for Hall thruster - Google Patents
High-precision assembling tool and method for Hall thruster Download PDFInfo
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- CN115673760A CN115673760A CN202310000675.5A CN202310000675A CN115673760A CN 115673760 A CN115673760 A CN 115673760A CN 202310000675 A CN202310000675 A CN 202310000675A CN 115673760 A CN115673760 A CN 115673760A
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Abstract
The invention provides a high-precision assembling tool of a Hall thruster, which is used for assembling the Hall thruster, wherein the Hall thruster comprises a magnetic conduction bottom plate, an inner magnetic assembly and a gas distributor, the gas distributor is annular, the inner magnetic assembly is provided with a central axis, and the high-precision assembling tool comprises: the positioning device comprises an upper positioning boss and a lower positioning boss arranged at one end of the upper positioning boss; the outer side surface of the positioning upper boss is matched with the inner side surface of the gas distributor; a positioning groove is arranged on the magnetic conduction bottom plate, and the shape of the positioning lower boss is matched with that of the positioning groove; when the lower positioning boss is inserted into the positioning groove, the outer side surface of the upper positioning boss is coaxial with the central axis of the inner magnetic assembly. The Hall thruster overcomes the defect that neutral gas and magnetic field centering deviation are easily generated in the assembling and manufacturing process of the Hall thruster in the prior art. The invention also provides an assembly method using the tool.
Description
Technical Field
The invention relates to the technical field of manufacturing of space electric propulsion devices, in particular to a high-precision assembling tool and method of a Hall thruster.
Background
The Hall thruster is an advanced space electric propulsion device, neutral gas is released through an annular gas distributor, electrons are released in an annular magnetic field at the same time, the electrons circularly rotate under the action of an electric field orthogonal to the magnetic field, the neutral gas is ionized by the moving electrons when passing through the annular magnetic field, and then the ions are accelerated and pushed out by the electric field, so that the whole device reversely generates thrust. The neutral gas released annularly needs to have higher requirement on the neutrality of the annular magnetic field, otherwise, after the neutral gas is dislocated relative to the annular magnetic field, even if the neutral gas is distributed uniformly by the gas distributor, the neutral gas can be unevenly distributed relative to the annular magnetic field, and uneven distribution of the propulsion working medium can cause insufficient ionization of the neutral gas and reduce the total thrust of the hall thruster, and can cause uneven distribution of the thrust of the thruster, thereby affecting the linear propulsion performance. In the prior art, the centering property of the neutral gas released annularly and the annular magnetic field is not paid enough attention, and deviation is easily generated by matching and mounting through common mounting hole positions in the assembling and manufacturing process.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect that the hall thruster in the prior art is easy to generate the alignment deviation of neutral gas and a magnetic field in the assembling and manufacturing process.
In order to solve the technical problem, the technical scheme adopted by the application is as follows:
the utility model provides an assembly fixture for hall thruster's assembly, hall thruster includes magnetic conduction bottom plate, interior magnetic component and gas distributor, and gas distributor is cyclic annular, and interior magnetic component has the axis, includes: the positioning device comprises an upper positioning boss and a lower positioning boss arranged at one end of the upper positioning boss;
the outer side surface of the positioning upper boss is matched with the inner side surface of the gas distributor;
a positioning groove is arranged on the magnetic conduction bottom plate, and the shape of the positioning lower boss is matched with that of the positioning groove;
when the lower positioning boss is inserted into the positioning groove, the outer side surface of the upper positioning boss is coaxial with the central axis of the inner magnetic assembly.
Optionally, an inner magnetic assembly mounting hole is formed in the magnetic conductive bottom plate, and a tooling stud is arranged on the positioning lower boss; the tool stud is suitable for penetrating into the inner magnetic assembly mounting hole and is fastened through a tool nut.
Optionally, the hall thruster further comprises an insulating base, the magnetic conductive bottom plate is provided with a distributor mounting hole around the positioning groove, and the bottom of the gas distributor is provided with a columnar piece; the insulating base is sleeved outside the columnar piece and inserted into the distributor mounting hole, the distance d between the outer edges of the insulating bases at opposite positions is smaller than the outer diameter of the upper positioning boss, a reducing section is arranged between the upper positioning boss and the lower positioning boss, and the diameter of the reducing section is not larger than the distance d; when the insulating seat is in a use state, the height of the reducing section is larger than that of the insulating seat.
Optionally, the positioning lower boss is a circular boss.
The assembling method is used for assembling the Hall thruster, the Hall thruster comprises a magnetic conduction bottom plate, an inner magnetic assembly, a gas distributor and a magnetic conduction shell assembly, the gas distributor is annular, the inner magnetic assembly is provided with a central axis, a positioning groove is formed in the magnetic conduction bottom plate, and a positioning table is arranged on the bottom surface of the inner magnetic assembly; the shape of the positioning table is matched with the positioning groove; the method comprises the following steps:
s20: the positioning lower boss is inserted into the positioning groove by using the assembly tool, and the assembly tool is fixed with the magnetic conduction bottom plate;
s30: inserting the gas distributor sleeve outside the assembly tool, and matching the outer side surface of the positioning upper boss with the inner side surface of the distributor main body during insertion; after the gas distributor sleeve is inserted in place, the gas distributor is fixed with the magnetic conduction bottom plate;
s40: the assembly tool is detached from the magnetic conduction bottom plate;
s50: inserting a positioning table of the inner magnetic assembly into the positioning groove, and fixing the inner magnetic assembly and the magnetic conduction bottom plate;
s60: the magnetic conduction shell component is fixed with the magnetic conduction bottom plate.
Optionally, 0.02mm clearance fit is adopted between the positioning table and the positioning groove, between the lower positioning boss and the positioning groove, and between the outer side surface of the upper positioning boss and the inner side surface of the distributor body.
Optionally, when the hall thruster further includes an insulating base, in step S30, after the insulating base is padded between the gas distributor and the magnetic conductive bottom plate, the gas distributor and the magnetic conductive bottom plate are fixed.
Optionally, when the magnetic conductive bottom plate is provided with a distributor mounting hole around the positioning groove and the gas distributor is provided with a column-shaped member at the bottom, the insulating base is set to be in a sleeve shape with an insulating base through hole, in step S10, the diameter of the distributor mounting hole is set to be larger than the diameter of the insertion portion of the insulating base, and the diameter of the insulating base through hole 501 is larger than the diameter of the column-shaped member;
in step S30, the insulator base is inserted into the dispenser mounting hole, and the post is inserted into the insulator base through hole.
Optionally, when the distance d between the outer edges of the insulation holders in the opposite positions is smaller than the outer diameter of the upper positioning boss, step S10 is further included before step S20: the insulator base is inserted into the dispenser mounting hole.
Optionally, the gas distributor is connected to the column by fillet welding at the bottom, and a slope-shaped welding leg is left; in step S30, when the gas distributor sleeve is inserted to the final stage, the welding leg enters the insulating seat counter bore, and the bottom surface of the gas distributor abuts against the top surface of the insulating seat.
By adopting the technical scheme, the invention has the following technical effects:
1. according to the assembly tool provided by the invention, the positioning lower boss is inserted into the positioning groove on the magnetic conduction bottom plate, so that the positioning upper boss which is coaxial with the central axis of the inner magnetic assembly is used for guiding the distributor main body of the gas distributor; when the gas distributor is installed, the circular ring center of the distributor body and the positioning upper lug boss are in a coaxial state through the matching of the positioning upper lug boss and the inner side face of the distributor body. After the assembly fixture is disassembled and the inner magnetic assembly is installed in a replacement mode, the inner magnetic assembly can be located the same as the assembly fixture through the same locating groove, so that the central axis of the inner magnetic assembly is coincident with the axis of the locating upper boss, and finally the center of the ring of the distributor body is in a coaxial relation with the central axis of the inner magnetic assembly through the bridge of the assembly fixture. Because the inner magnetic assembly is used as a core component for generating a magnetic field, the position of the inner magnetic assembly determines the central axis of the annular magnetic field. The annular distributor body is used as a core component for releasing neutral gas, so that the neutral gas can be released outwards in the shape of the distributor body and flows out, the distributor body is ensured, namely after the center of the circular ring of the gas distributor and the central axis of the inner magnetic assembly are in a coaxial relationship, the neutral gas can be ensured to be precisely centered with the annular magnetic field when being released annularly, and finally the thrust performance of the Hall thruster is ensured.
2. According to the assembly tool provided by the invention, the tool stud is arranged on the lower positioning boss; the tool stud is suitable for penetrating the inner magnetic assembly mounting hole and is fastened through the tool nut, the threaded connection portion is tightly adjacent to the positioning lower boss and the positioning groove for positioning, fastening force is directly acted on the fitting surface through the shortest path, and positioning between the assembling tool and the magnetic conduction bottom plate can be firmer and more reliable.
3. According to the assembly tool provided by the invention, the reducing section is arranged, so that the interference effect of an overlarge insulating base on the assembly tool during operation can be avoided, and the insulating base is avoided from the height and the width of the reducing section, namely from the axial direction and the radial direction of the Hall thruster, so that the installation of the insulating base with larger size can be ensured, and the insulating performance grade is improved.
4. According to the assembling method provided by the invention, the clearance fit of 0.02mm is adopted between the positioning table and the positioning groove, between the positioning lower boss and the positioning groove and between the outer side surface of the positioning upper boss and the inner side surface of the distributor main body, so that the assembling precision is ensured, the simplicity and convenience of assembling and disassembling tools in assembling operation are considered, the assembling precision higher than 0.1mm can be finally realized, and the assembling precision is ensured particularly for small-size Hall thrusters.
5. According to the assembling method provided by the invention, the counter bore of the insulating seat is arranged, so that the installation error caused by the welding leg can be avoided, and the axial installation precision of the gas distributor is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic cross-sectional view of a hall thruster according to an embodiment of the present invention;
fig. 2 is a schematic perspective view of a hall thruster according to an embodiment of the present invention, with a gas distributor omitted;
fig. 3 is a schematic perspective view of a gas distributor of a hall thruster according to an embodiment of the present invention;
fig. 4 is a schematic structural sectional view of a gas distributor of a hall thruster according to an embodiment of the present invention;
fig. 5 is a schematic perspective view of a structure of a magnetic bottom plate of a hall thruster according to an embodiment of the present invention;
fig. 6 is a schematic perspective view of a magnetically conductive housing assembly of the hall thruster according to an embodiment of the present invention;
fig. 7 is a schematic perspective view of the structure of the insulating base of the hall thruster according to the embodiment of the present invention;
FIG. 8 is a schematic structural cross-sectional view of an inner magnetic assembly of a Hall thruster according to an embodiment of the present invention;
FIG. 9 is a schematic perspective view of an assembly fixture according to an embodiment of the present invention;
FIG. 10 is a schematic cross-sectional view of an assembled structure at step S10 according to an embodiment of the present invention;
FIG. 11 is a schematic cross-sectional view of an assembled structure at step S20 according to an embodiment of the present invention;
FIG. 12 is a schematic cross-sectional view of an assembled structure at step S30 according to an embodiment of the present invention;
FIG. 13 is a schematic cross-sectional view of an assembled structure at step S40 according to an embodiment of the present invention;
fig. 14 is a schematic sectional view of an assembly structure at step S50 according to an embodiment of the present invention.
Description of reference numerals:
1. a magnetically conductive housing assembly; 2. a gas distributor; 3. an internal magnetic assembly; 4. an inner magnetic assembly nut; 5. an insulating base; 6. an insulating base nut; 7. a magnetically conductive base plate; 8. a baseplate bolt; 9. assembling a tool; 10. a tool nut; 101. a housing mounting hole; 102. mounting a foot; 103. a housing main body; 104. an outer protective ring; 201. an upper cushion member; 202. a middle buffer member; 203. a dispenser base; 204. welding feet; 205. an air inlet column; 206. fixing the stud; 207. a dispenser body; 301. an inner guard ring; 302. a magnetic conducting inner core; 303. a magnetic conductive inner core is added; 304. an annular magnetic assembly; 305. a positioning table; 306. an inner magnetic assembly stud; 307. a central column; 501. an insulating base through hole; 502. insulating seat counter bore; 503. an insulating base body; 504. an insulating base stud; 701. positioning a groove; 702. an inner magnetic assembly mounting hole; 703. a base plate main body; 704. a magnetic conduction shell mounting hole; 705. an external connection hole; 706. a distributor mounting hole 901 and an upper positioning boss; 902. a reducing section; 903. positioning the lower boss; 904. and (5) assembling a stud.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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", and the like 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 referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 a specific case to those of ordinary skill in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment provides an assembly tool for assembling a Hall thruster, wherein the Hall thruster at least comprises a magnetic conduction bottom plate 7, an inner magnetic assembly 3 with a central axis, an annular gas distributor 2 and a magnetic conduction shell assembly 1. The structure thereof can be specifically referred to as shown in fig. 1 to 8.
The magnetic conductive bottom plate 7 is provided with a positioning groove 701, a distributor mounting hole 706 is formed around the positioning groove 701, and a magnetic conductive housing mounting hole 704 and an external connecting hole 705 for connecting the outside are further formed in the bottom plate main body 703. The inner magnetic assembly 3 is a core component that generates a magnetic field and may include a center post 307, an outer annular magnetic assembly 304, a magnetically permeable inner core 302 at the top, and an additional magnetically permeable inner core 303 disposed between the magnetically permeable inner core 302 and the annular magnetic assembly 304, as shown in fig. 8, and an inner guard ring 301 may also be disposed around the magnetically permeable inner core 302. The center post 307 forms the positioning stage 305 on the bottom surface of the inner magnetic assembly 3 and provides the inner magnetic assembly 3 with a central axis. The positioning table 305 is adapted to the positioning groove 701 in shape, and in order to take account of the matching accuracy and the assembling and disassembling convenience, the positioning table and the positioning table can be in clearance fit of 0.02 mm. The inner magnetic assembly 3 is positioned on the magnetic conductive bottom plate 7 through the matching between the positioning table 305 and the positioning groove 701. The gas distributor 2 is arranged on the magnetic conductive bottom plate 7; the gas distributor 2 comprises a distributor body 207 and several columns; the distributor main body 207 is annular, and specifically, as shown in fig. 3, may include an upper buffer 201, a middle buffer 202, and a distributor base 203. Several of the columns may be embodied as an air inlet column 205 and a fixing stud 206, which are attached to one end of the distributor body 207, i.e. the distributor base 203. The internal magnetic assembly 3 is located inside the ring body of the distributor body 207; and the inner magnetic assembly 3 and the distributor body 207 have a gap therebetween and do not contact with each other for the purpose of insulation or increase of the air outlet passage. The post is inserted into the dispenser mounting hole 706 and may have a clearance from the dispenser mounting hole 706 due to manufacturing tolerances or due to design considerations. The gap is adapted to adjustably vary the relative position of the gas distributor 2 and the magnetically conductive base plate 7. As shown in fig. 6, the magnetic conductive housing assembly 1 includes a housing main body 103 and an outer protective ring 104, and a mounting foot 102 may be further disposed on the housing main body 103 for opening a housing mounting hole 101. Which is mounted on a magnetically conductive base plate 7 and surrounds the outside of the dispenser body 207. The specific connection mode can be a threaded connection mode that the baseplate bolt 8 penetrating through the magnetic conduction shell mounting hole 704 is matched with the shell mounting hole 101, and can also be a mode such as welding.
One embodiment of the assembly tool is shown in fig. 9, and includes a positioning upper boss 901 and a positioning lower boss 903 provided at one end of the positioning upper boss 901. The outer side surface of the positioning upper boss 901 is matched with the inner side surface of the distributor main body 207, and the shape of the positioning lower boss 903 is matched with the positioning groove 701. After the positioning lower boss 903 is inserted into the positioning groove 701, the positioning upper boss 901 is coaxial with the central axis of the inner magnetic assembly 3.
The assembling and manufacturing process of the Hall thruster using the assembling tool comprises the following operation steps as shown in FIGS. 10 to 14:
s20: using the assembly fixture, inserting the positioning lower boss 903 into the positioning groove 701, and fixing the assembly fixture 9 and the magnetic conductive bottom plate 7;
s30: inserting the gas distributor 2 outside the assembly tool 9 in a sleeving manner, and matching the outer side surface of the positioning upper boss 901 with the inner side surface of the distributor main body 207 during insertion; after the gas distributor 2 is inserted in place, the gas distributor 2 is fixed with the magnetic conduction bottom plate 7;
s40: the assembling tool 9 is detached from the magnetic conduction bottom plate 7;
s50: inserting the positioning table 305 of the inner magnetic assembly 3 into the positioning groove 701, and fixing the inner magnetic assembly 3 and the magnetic conduction bottom plate 7;
s60: and fixing the magnetic conduction shell component 1 and the magnetic conduction bottom plate 7, and finally installing to form the Hall thruster shown in the figure 1.
It should be noted that the above-mentioned fixing means may be detachable connection, such as screw connection, or non-detachable connection, such as glue or welding.
In the assembly process, the positioning lower boss 903 on the assembly tool 9 is inserted into the positioning groove 701 on the magnetic conductive bottom plate 7, so that the positioning upper boss 901 coaxial with the central axis of the inner magnetic assembly 3 is used for guiding the distributor main body 207 of the gas distributor 2; when the gas distributor 2 is installed, the positioning upper boss 901 is fitted to the inner side surface of the distributor main body 207, so that the annular center of the distributor main body 207 is coaxial with the positioning upper boss 901. Thus, after the assembly fixture 9 is removed and the inner magnetic assembly 3 is installed in a replacement manner, the inner magnetic assembly 3 can be positioned in the same way as the assembly fixture 9 through the same positioning groove 701, so that the central axis of the inner magnetic assembly 3 coincides with the axis of the positioning upper boss 901, and finally the center of the circular ring of the distributor main body 207 and the central axis of the inner magnetic assembly 3 are in a coaxial relationship through the bridge of the assembly fixture 9. Because the inner magnetic assembly 3 is used as a core component for generating a magnetic field, the position of the inner magnetic assembly determines the central axis of the annular magnetic field. The annular distributor main body 207 is used as a core component for releasing neutral gas, so that the neutral gas can be released outwards in the shape of the distributor main body 207 and flows out, the distributor main body 207, namely the center of the circular ring of the gas distributor 2 and the central axis of the inner magnetic assembly 3 are in a coaxial relationship, the neutral gas can be ensured to be precisely centered with the annular magnetic field when released annularly, and finally the thrust performance of the Hall thruster is ensured.
Based on the above embodiments, in an alternative embodiment, as shown in fig. 5 and 8, the positioning groove 701 is a circular sinking groove; the positioning table 305 is a circular boss and is coaxial with the central axis of the inner magnetic assembly 3. The circular sinking groove and the circular boss are convenient for turning, and particularly when the positioning table 305 is coaxial with the central axis of the inner magnetic assembly 3, the circular sinking groove and the circular boss can be conveniently clamped and then manufactured, so that high assembly precision can be obtained through a simple structure and a simple process.
Based on the above embodiments, in an alternative embodiment, as shown in fig. 1, 5 and 9, an inner magnetic assembly mounting hole 702 is provided on the magnetic conductive bottom plate 7, and a tooling stud 904 is provided on the positioning lower boss 903; the tooling studs 904 are adapted to pass through the inner magnetic assembly mounting holes 702 and be tightened by the tooling nut 10. The arrangement enables the threaded connection part to be tightly adjacent to the positioning lower boss 903 and the positioning groove 701 for positioning, and the fastening force directly acts on the matching surface through the shortest path, so that the positioning between the assembly tool 9 and the magnetic conduction bottom plate 7 can be firmer and more reliable.
Similarly, the hall thruster may also be provided with an inner magnetic assembly mounting hole 702 penetrating through the magnetic conductive bottom plate 7 at the center of the positioning groove 701, an inner magnetic assembly stud 306 at the center of the positioning table 305, and the inner magnetic assembly stud 306 penetrates through the inner magnetic assembly mounting hole 702 and is fastened through the inner magnetic assembly nut 4. Besides the advantages of stable positioning and connection, the mounting and fixing of the inner magnetic assembly 3 are also solved, and the inner magnetic assembly 3 is located at the innermost side of the whole device, so that the inner magnetic assembly is not easy to be effectively fixed as a part mounted earlier under the condition of generally following the assembly sequence from inside to outside in the assembly process.
Based on the above embodiment, in an alternative embodiment, as shown in fig. 1, 5 and 9, the hall thruster further includes an insulating base 5, a magnetic conductive bottom plate 7 is provided with a distributor mounting hole 706 around the positioning groove 701, and the gas distributor 2 is provided with a column-shaped member at the bottom; the insulating base 5 is sleeved outside the column and inserted into the distributor mounting hole 706. As shown in fig. 11, a distance d between outer edges of the insulating base 5 in the opposite position is smaller than an outer diameter of the positioning upper boss 901, a reduced diameter section 902 is provided between the positioning upper boss 901 and the positioning lower boss 903, and a diameter of the reduced diameter section 902 is not larger than the distance d. In use, the reduced diameter section 902 has a height greater than the height of the insulator base 5. After the reducing section 902 is arranged, the interference effect of the overlarge insulating base 5 on the assembling tool 9 during operation can be avoided, the reducing section 902 avoids the insulating base 5 from the height and the width, namely, the axial direction and the radial direction of the Hall thruster, so that the installation of the insulating base 5 with a larger size can be ensured, and the insulating performance grade is improved.
Based on the above embodiments, in an alternative embodiment, as shown in fig. 1 and 9, the positioning lower boss 903 is a circular boss. The circular boss can be matched with the circular sinking groove, so that turning is convenient, particularly, when the lower positioning boss 903 and the upper positioning boss 901 are coaxial, the lower positioning boss can be conveniently clamped and then manufactured, and therefore high assembling accuracy can be obtained through a simple structure and a simple process.
Based on the above-described embodiment of the assembly method, in an alternative embodiment, a clearance fit of 0.02mm is adopted between the positioning table 305 and the positioning groove 701, between the positioning lower boss 903 and the positioning groove 701, and between the outer side surface of the positioning upper boss 901 and the inner side surface of the dispenser body 207. By adopting the matching, the assembly precision is ensured, the simplicity of assembling and disassembling the tool during the assembly operation is considered, the assembly precision higher than 0.1mm can be finally realized, and the assembly precision is ensured particularly for small-size Hall thrusters.
Based on the above-mentioned embodiment of the assembling method, in an alternative embodiment, as shown in fig. 1 and 12, when the hall thruster further includes the insulating base 5, in step S30, after the insulating base 5 is padded between the gas distributor 2 and the magnetic conductive bottom plate 7, the gas distributor 2 and the magnetic conductive bottom plate 7 are fixed. With setting up insulating seat 5 between gas distributor 2 and the magnetic conduction bottom plate 7, can make gas distributor 2 play the effect of positive pole, avoid with electric conduction to other parts of hall propeller.
Based on the above-described embodiment of the assembling method, in an alternative embodiment, as shown in fig. 1 to 8, when the magnetically conductive bottom plate 7 is provided with the distributor mounting hole 706 around the positioning groove 701 and the gas distributor 2 is provided with the column member at the bottom, the insulating base 5 is provided in a sleeve shape having the insulating base through hole 501. In step S10, the distributor mounting hole 706 is set to have a diameter larger than that of the insertion portion of the insulator base 5 to form a gap for adjusting the position; similarly, the diameter of the insulator base through hole 501 is greater than the diameter of the post. In step S30, the insulator base 5 is inserted into the dispenser mounting hole 706, and the column is inserted into the insulator base through hole 501.
The gas distributor 2 is provided with a column at the bottom to facilitate self-fixing and gas circuit arrangement, so that the diameter of the insertion part of the insulating base 5 and the column is smaller relative to the diameter of the matching hole, thereby creating a gap capable of adjusting the relative position of the gas distributor 2 and the magnetic conductive bottom plate 7, so that under the guiding action of the assembly tool 9, the column can be placed at a proper position and then fixed. So as not to cause unnecessary stress due to bending deformation of the column relative to the magnetic conduction bottom plate 7 caused by the undersize of the related hole.
Based on the above-mentioned embodiment of the assembling method, in an alternative embodiment, as shown in fig. 1 and 11, when the distance d between the outer edges of the insulation seat 5 in the opposite position is smaller than the outer diameter of the positioning upper boss 901, a step S10 is further included before step S20: the insulator base 5 is inserted into the dispenser mounting hole 706. Thus, the interference of the oversize insulating seat 5 on the assembling tool 9 during operation is avoided.
Based on the above-described embodiment of the assembly method, in an alternative embodiment, as shown in fig. 1, 4 and 7, the gas distributor 2 is connected to the cylindrical member at the bottom by fillet welding, leaving a sloping fillet 204; an insulator seat counterbore 502 adapted to receive the solder tail 204 is provided at an end of the insulator seat through hole 501 proximate the solder tail 204. In step S30, when the gas distributor 2 is inserted to the final stage, the fillet 204 is inserted into the counterbore 502 of the insulator base, and the bottom surface of the gas distributor 2 abuts against the top surface of the insulator base 5.
Specifically, as shown in fig. 7, the insulating base 5 of the present embodiment includes an insulating base main body 503 and an insulating base stud 504 disposed at one end of the insulating base main body 503, an insulating base through hole 501 penetrates through the insulating base main body 503 and the insulating base stud 504, and an insulating base counterbore 502 is disposed on the insulating base main body 503; the outer diameter of the insulator base body 503 is larger than the diameter of the distributor mounting hole 706; the insulator mount studs 504 are inserted into the dispenser mounting holes 706 and tightened by insulator mount nuts 6.
This is because the welding is the most common assembly method of the gas distributor 2, wherein fillet welding is usually adopted for the welding between the column and the surface of the column and the distributor main body 207, and the fillet welding generates the slope-shaped welding foot 204, which causes the root of the column to become larger in size, and usually the heights of the welding feet 204 to be different, if the insulation seat counter bore 502 for accommodating the welding foot 204 is not provided, the actual heights of the batches of the gas distributor 2 after being inserted to the bottom are different, which deteriorates the product consistency, and the slope-shaped welding foot 204 is easily worn in cooperation with the thinner bore, which not only destroys the connection strength, but also makes the position of the gas distributor 2 in the axial direction of the hall thruster easily loose, which causes the equipment to work unstably. And the arrangement of the insulating seat counter bore 502 can avoid the installation error brought by the welding leg 204, so that the axial installation precision of the gas distributor 2 is ensured.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (10)
1. The utility model provides a high accuracy assembly fixture of hall thruster for the assembly of hall thruster, hall thruster includes magnetic conduction bottom plate (7), interior magnetic component (3) and gas distributor (2), and gas distributor (2) are cyclic annular, and interior magnetic component (3) have the axis, its characterized in that includes: the positioning device comprises an upper positioning boss (901) and a lower positioning boss (903) arranged at one end of the upper positioning boss (901);
the outer side surface of the positioning upper boss (901) is matched with the inner side surface of the gas distributor (2);
a positioning groove (701) is arranged on the magnetic conduction bottom plate (7), and the shape of the positioning lower boss (903) is matched with the positioning groove (701);
when the lower positioning boss (903) is inserted into the positioning groove (701), the outer side surface of the upper positioning boss (901) is coaxial with the central axis of the inner magnetic assembly (3).
2. The high-precision assembling tool of the Hall thruster according to claim 1, wherein an inner magnetic assembly mounting hole (702) is formed in the magnetic conductive bottom plate (7), and a tool stud (904) is arranged on the positioning lower boss (903); the tool stud (904) is suitable for penetrating into the inner magnetic assembly mounting hole (702) and is fastened through a tool nut (10).
3. The high-precision assembling tool of the Hall thruster according to claim 1, wherein the Hall thruster further comprises an insulating base (5), a distributor mounting hole (706) is formed in the magnetic conductive bottom plate (7) around the positioning groove (701), and a columnar piece is arranged at the bottom of the gas distributor (2); the insulating seat (5) is sleeved outside the columnar piece and inserted into the distributor mounting hole (706), the distance d between the outer edges of the insulating seat (5) at opposite positions is smaller than the outer diameter of the upper positioning boss (901), a reducing section (902) is arranged between the upper positioning boss (901) and the lower positioning boss (903), and the diameter of the reducing section (902) is not larger than the distance d; when the insulating seat is in a use state, the height of the reducing section (902) is larger than that of the insulating seat (5).
4. The high-precision assembling tool for the Hall thruster according to any one of claims 1 to 3, wherein the positioning lower boss (903) is a circular boss.
5. The assembling method is characterized by being used for assembling the Hall thruster, the Hall thruster comprises a magnetic conduction bottom plate (7), an inner magnetic assembly (3), a gas distributor (2) and a magnetic conduction shell assembly (1), the gas distributor (2) is annular, the inner magnetic assembly (3) is provided with a central axis, a positioning groove (701) is formed in the magnetic conduction bottom plate (7), and a positioning table (305) is arranged on the bottom surface of the inner magnetic assembly (3); the shape of the positioning table (305) is matched with that of the positioning groove (701); the method comprises the following steps:
s20: the high-precision assembling tool of the Hall thruster is used, the lower positioning boss (903) is inserted into the positioning groove (701), and the high-precision assembling tool of the Hall thruster is fixed with the magnetic conductive bottom plate (7);
s30: inserting a gas distributor (2) outside a high-precision assembling tool of the Hall thruster in a sleeved mode, and enabling the outer side face of the positioning upper boss (901) to be matched with the inner side face of the distributor main body (207) during inserting; after the gas distributor (2) is sleeved and inserted in place, the gas distributor (2) is fixed with the magnetic conduction bottom plate (7);
s40: the high-precision assembling tool of the Hall thruster is detached from the magnetic conductive bottom plate (7);
s50: inserting a positioning table (305) of the inner magnetic assembly (3) into a positioning groove (701), and fixing the inner magnetic assembly (3) and a magnetic conduction bottom plate (7);
s60: the magnetic conduction shell component (1) is fixed with the magnetic conduction bottom plate (7).
6. An assembly method according to claim 5, characterized in that a clearance fit of 0.02mm is adopted between the positioning table (305) and the positioning groove (701), between the positioning lower boss (903) and the positioning groove (701) and between the outer side of the positioning upper boss (901) and the inner side of the distributor body (207).
7. The assembling method according to claim 5, wherein when the Hall thruster further comprises an insulating base (5), in step S30, after the insulating base (5) is padded between the gas distributor (2) and the magnetically conductive bottom plate (7), the gas distributor (2) and the magnetically conductive bottom plate (7) are fixed.
8. The assembling method according to claim 7, wherein when the magnetically conductive bottom plate (7) is provided with a distributor mounting hole (706) around the positioning groove (701) and the gas distributor (2) is provided with a column-shaped member at the bottom, the insulating base (5) is provided in a sleeve shape with an insulating base through hole (501), in step S10, the diameter of the distributor mounting hole (706) is set to be larger than that of the insertion portion of the insulating base (5), and the diameter of the insulating base through hole (501) is larger than that of the column-shaped member;
in step S30, the insulator base (5) is inserted into the dispenser mounting hole (706), and the column is inserted into the insulator base through hole (501).
9. The assembling method according to claim 8, wherein when the distance d between the outer edges of the insulating holders (5) in the opposite positions is smaller than the outer diameter of the positioning upper boss (901), the method further comprises step S10 before step S20: the insulator base (5) is inserted into the dispenser mounting hole (706).
10. Assembly method according to claim 7, characterized in that the gas distributor (2) is joined to the cylindrical part at the bottom by means of a fillet weld, leaving a sloping fillet (204); in step S30, when the gas distributor (2) is inserted to the final stage, the solder leg (204) enters the insulating seat counterbore (502), and the bottom surface of the gas distributor (2) abuts against the top surface of the insulating seat (5).
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| CN202310000675.5A CN115673760B (en) | 2023-01-03 | 2023-01-03 | High-precision assembly tool and method for Hall thruster |
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| CN202310000675.5A CN115673760B (en) | 2023-01-03 | 2023-01-03 | High-precision assembly tool and method for Hall thruster |
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| CN115673760B CN115673760B (en) | 2023-05-12 |
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| CN115673760B (en) | 2023-05-12 |
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