CN115673760B - High-precision assembly tool and method for Hall thruster - Google Patents
High-precision assembly tool and method for Hall thruster Download PDFInfo
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- CN115673760B CN115673760B CN202310000675.5A CN202310000675A CN115673760B CN 115673760 B CN115673760 B CN 115673760B CN 202310000675 A CN202310000675 A CN 202310000675A CN 115673760 B CN115673760 B CN 115673760B
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Abstract
The invention provides a high-precision assembly fixture 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, and the inner magnetic assembly is provided with a central axis and comprises: the positioning upper boss and the positioning lower boss are arranged at one end of the positioning upper 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 formed in the magnetic conduction bottom plate, and the shape of the positioning lower boss is matched with 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 the Hall thruster in the prior art is extremely easy to generate the centering deviation of neutral gas and a magnetic field in the assembly and manufacturing process. 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 assembly 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, the electrons circularly rotate under the action of an electric field orthogonal to the magnetic field, the neutral gas is ionized by the electrons in motion when passing through the annular magnetic field, and then ions are accelerated and pushed out by the electric field, so that the whole device reversely generates thrust. The process is very important in that the requirement on the centering of the annular released neutral gas and the annular magnetic field is higher, otherwise, after the neutral gas is misplaced relative to the annular magnetic field, even if the gas distributor distributes the neutral gas uniformly again, the neutral gas can be distributed unevenly relative to the annular magnetic field, and the uneven distribution of the propelling working medium can cause insufficient ionization of the neutral gas, so that the total thrust of the Hall thruster is reduced, and the uneven distribution of the thrust of the thruster is also caused, so that the linear propelling performance is influenced. In the prior art, the neutrality of the annular released neutral gas and the annular magnetic field is not paid attention to, and the deviation is easily generated by the matching installation of common installation holes in the assembly 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 extremely easy to generate the deviation of the neutrality between neutral gas and magnetic field in the assembly and manufacturing process.
In order to solve the technical problems, the technical scheme adopted by the application is as follows:
an assembly fixture for the assembly of hall thruster, 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 upper boss and the positioning lower boss are arranged at one end of the positioning upper 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 formed in the magnetic conduction bottom plate, and the shape of the positioning lower boss is matched with 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 conduction 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 being fastened through the tool nut.
Optionally, the hall thruster further comprises an insulating seat, the magnetic conduction 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 insulation seat is sleeved outside the columnar piece and inserted into the mounting hole of the distributor, the distance d between the outer edges of the insulation seat at opposite positions is smaller than the outer diameter of the positioning upper boss, a diameter-reducing section is arranged between the positioning upper boss and the positioning lower boss, and the diameter of the diameter-reducing section is not larger than the distance d; when in a use state, the height of the diameter-reducing section is larger than the height of the insulating seat.
Optionally, the positioning lower boss is a circular boss.
The assembly 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, wherein the gas distributor is annular, the inner magnetic assembly is provided with a central axis, a positioning groove is arranged on 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: inserting the lower positioning boss into the positioning groove by using the assembly tool, and fixing the assembly tool and the magnetic conduction bottom plate;
s30: inserting the gas distributor sleeve outside the assembly tool, and matching the outer side surface of the upper positioning 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: removing the assembly fixture 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: and fixing the magnetic conductive shell assembly with the magnetic conductive bottom plate.
Optionally, 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 positioning upper boss outer side surface and the distributor main body inner side surface.
Optionally, when the hall thruster further includes an insulating seat, in step S30, after the insulating seat is provided between the gas distributor and the magnetically conductive bottom plate, the gas distributor and the magnetically 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 air distributor is provided with a column member at the bottom, the insulating seat is set to be a sleeve shape with an insulating seat through hole, and in step S10, the diameter of the distributor mounting hole is set to be larger than the diameter of the inserting part of the insulating seat, and the diameter of the insulating seat through hole 501 is larger than the diameter of the column member;
in step S30, the insulating holder is inserted in the dispenser mounting hole, and the column is inserted in the insulating holder through hole.
Optionally, when the distance d between the outer edges of the insulating seats in the opposite positions is smaller than the outer diameter of the positioning upper boss, step S10 is further included before step S20: the insulator seat is inserted into the dispenser mounting hole.
Optionally, the gas distributor is connected to the column at the bottom by fillet welding, leaving a sloping fillet; in step S30, when the gas distributor sleeve is inserted into the final stage, the welding leg is made to enter the counter bore of the insulating base, and the bottom surface of the gas distributor is made to abut against the top surface of the insulating base.
By adopting the technical scheme, the invention has the following technical effects:
1. according to the assembly fixture 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 coaxial with the central axis of the inner magnetic assembly can be used for guiding the distributor main body of the gas distributor; when the gas distributor is installed, the center of the circular ring of the distributor main body is in a coaxial state with the upper positioning boss through the cooperation of the upper positioning boss and the inner side surface of the distributor main body. Therefore, after the assembly fixture is removed to replace and install the inner magnetic assembly, the inner magnetic assembly can be positioned the same as the assembly fixture through the same positioning groove, so that the central axis of the inner magnetic assembly coincides with the axis of the boss on the positioning, and the center of the circular ring of the distributor main body is finally in coaxial relation with the central axis of the inner magnetic assembly through the bridge of the assembly fixture. Because the inner magnetic assembly serves 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 the accurate centering between the neutral gas and the annular magnetic field when the neutral gas is released in an annular manner can be ensured after the distributor body, namely the center of the annular ring of the gas distributor and the central axis of the inner magnetic assembly are in coaxial relation, 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 boss through positioning; the tool stud is suitable for penetrating into the inner magnetic assembly mounting hole and being fastened through the tool nut, so that the threaded connection part is closely adjacent to the lower positioning boss and the positioning groove for positioning, the fastening force directly acts on the matching surface in the shortest path, and the positioning between the assembly 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 to avoid the interference of the oversized insulating seat on the assembly tool during operation, and the reducing section avoids the insulating seat in the height and width directions, namely the axial direction and the radial direction of the Hall thruster, so that the installation of the insulating seat with a larger size can be ensured, and the insulating performance level is improved.
4. According to the assembly method provided by the invention, the assembly precision is ensured by adopting clearance fit of 0.02mm 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 main body, the simplicity of the assembly and disassembly tool during assembly operation is also considered, and finally, the assembly precision higher than 0.1mm can be realized, especially for a small-size Hall thruster, and the assembly precision is ensured.
5. According to the assembly method provided by the invention, the mounting error caused by welding pins can be avoided by arranging the counter bore of the insulating seat, so that the axial mounting 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 that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
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 cross-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 magnetic conductive bottom plate of a hall thruster according to an embodiment of the present invention;
fig. 6 is a schematic perspective view of a magnetic conductive housing assembly of a hall thruster according to an embodiment of the present invention;
fig. 7 is a schematic perspective view of the insulating base of the hall thruster according to the embodiment of the present invention;
FIG. 8 is a schematic cross-sectional view of the internal magnetic assembly of the Hall thruster in accordance with 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 the assembled structure at step S10 according to the embodiment of the present invention;
fig. 11 is a schematic cross-sectional view of the assembled structure at step S20 according to the embodiment of the present invention;
fig. 12 is a schematic cross-sectional view of the assembled structure at step S30 according to the embodiment of the present invention;
fig. 13 is a schematic cross-sectional view of the assembled structure at step S40 according to the embodiment of the present invention;
fig. 14 is a schematic cross-sectional view of the assembled structure at step S50 according to the embodiment of the present invention.
Reference numerals illustrate:
1. a magnetically permeable housing assembly; 2. a gas distributor; 3. an inner magnetic assembly; 4. an inner magnetic assembly nut; 5. an insulating base; 6. an insulating seat nut; 7. a magnetically conductive bottom plate; 8. a base plate bolt; 9. assembling a tool; 10. a tool nut; 101. a housing mounting hole; 102. a mounting foot; 103. a housing main body; 104. an outer protective ring; 201. an upper buffer member; 202. a middle buffer member; 203. a dispenser base; 204. welding feet; 205. an air inlet column; 206. fixing a stud; 207. a dispenser body; 301. an inner protection ring; 302. a magnetically conductive inner core; 303. adding a magnetic conduction inner core; 304. a toroidal magnetic assembly; 305. a positioning table; 306. an inner magnetic assembly stud; 307. a center column; 501. an insulating seat through hole; 502. an insulating seat counter bore; 503. an insulating seat main body; 504. an insulating seat stud; 701. a positioning groove; 702. an inner magnetic assembly mounting hole; 703. a base plate main body; 704. a magnetic conductive housing mounting hole; 705. an external connection hole; 706. a distributor mounting hole, 901 and a positioning upper boss; 902. a reducing section; 903. positioning a lower boss; 904. tool studs.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are directions or positional relationships based on the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements 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 explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The embodiment provides an assembly fixture 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 and an annular gas distributor 2, and can also comprise a magnetic conduction shell assembly 1. The structure of which is shown in particular in figures 1 to 8.
Wherein, the magnetic conduction bottom plate 7 is provided with a positioning groove 701, and a distributor mounting hole 706 is arranged around the positioning groove 701, and in addition, a magnetic conduction housing mounting hole 704 and an external connection hole 705 for connecting the outside are also arranged on 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 annular magnetic assembly 304 on the outside, a magnetically permeable inner core 302 on the top, and an additional magnetically permeable inner core 303 disposed between the magnetically permeable inner core 302 and the annular magnetic assembly 304, and may further include an inner guard ring 301 disposed around the outer circumference of the magnetically permeable inner core 302, as shown in fig. 8. The center post 307 forms a positioning table 305 on the bottom surface of the inner magnetic assembly 3 and provides the inner magnetic assembly 3 with a central axis. The shape of the positioning table 305 is matched with the positioning groove 701, so that the positioning table and the positioning groove can be matched with each other by adopting a clearance of 0.02mm for both accuracy of matching and convenience of disassembly and assembly. The inner magnetic assembly 3 is positioned on the magnetic conductive bottom plate 7 through the cooperation between the positioning table 305 and the positioning groove 701. The gas distributor 2 is arranged on the magnetic conduction bottom plate 7; the gas distributor 2 comprises a distributor body 207 and several columns; the dispenser body 207 is annular and may include an upper buffer 201, a middle buffer 202, and a dispenser base 203 as shown in fig. 3. A plurality of the columns may be specifically, for example, an intake column 205 and a fixing stud 206, which are connected to one end of the dispenser body 207, i.e., the dispenser base 203. The inner magnetic assembly 3 is located inside the ring body of the dispenser body 207; and the inner magnetic assembly 3 and the distributor body 207 have a gap therebetween, and are not in contact, for the purpose of insulation or enlarging the air outlet passage. The posts are inserted into the dispenser mounting holes 706 and may have a gap with the dispenser mounting holes 706 due to manufacturing tolerances or deliberate design. The gap is adapted to adjust the relative position of the gas distributor 2 and the magnetically permeable soleplate 7. The magnetic conductive housing assembly 1 may include a housing body 103 and an outer protection ring 104, and mounting pins 102 may be provided on the housing body 103 for forming housing mounting holes 101, as shown in fig. 6. Which is mounted on the magnetically permeable base plate 7 and surrounds the outside of the distributor body 207. The connection mode can be a threaded connection mode that the bottom plate bolt 8 penetrating through the magnetic conductive shell mounting hole 704 is matched with the shell mounting hole 101, or a welding mode or the like.
One embodiment of the assembly fixture is shown in fig. 9, and includes an upper positioning boss 901 and a lower positioning boss 903 disposed at one end of the upper positioning boss 901. The outer side of the positioning upper boss 901 is matched with the inner side of the dispenser 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 Hall thruster assembly manufacturing process using the assembly tool, as shown in fig. 10-14, comprises the following operation steps:
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 fixture 9, 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 sleeved in place, the gas distributor 2 is fixed with the magnetic conduction bottom plate 7;
s40: the assembly fixture 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: the magnetic conduction shell component 1 is fixed with the magnetic conduction bottom plate 7, and finally the Hall thruster shown in fig. 1 is formed.
It should be noted that the fixing means may be a detachable connection, such as a threaded connection, or a non-detachable connection, such as an adhesive connection or a welding connection.
In the assembly process, the positioning lower boss 903 on the assembly tool 9 is inserted into the positioning groove 701 on the magnetic conduction bottom plate 7, so that the positioning upper boss 901 coaxial with the central axis of the inner magnetic assembly 3 can be 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 matched with the inner side surface of the distributor main body 207, so that the center of the circular ring of the distributor main body 207 is in a coaxial state with the positioning upper boss 901. Thus, after the assembly fixture 9 is removed to replace the inner magnetic assembly 3, the inner magnetic assembly 3 can be positioned the same 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 the bridge of the assembly fixture 9 finally enables the center of the circular ring of the distributor main body 207 to be in coaxial relation with the central axis of the inner magnetic assembly 3. Since the inner magnetic assembly 3 serves as a core member for generating a magnetic field, its own position determines the central axis of the toroidal magnetic field. The annular distributor 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 body 207, and the accurate centering between the neutral gas and the annular magnetic field when the neutral gas is released in an annular manner can be ensured after the distributor body 207, namely the center of the annular ring of the gas distributor 2 and the central axis of the inner magnetic assembly 3 are in coaxial relation, 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 countersink; the positioning table 305 is a circular boss and is coaxial with the central axis of the inner magnetic assembly 3. The circular countersink 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 countersink and the circular boss can be conveniently clamped and then turned, so that higher assembly precision can be achieved through a simple structure and a simple process.
Based on the above embodiment, 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 base plate 7, and a tooling stud 904 is provided on the positioning lower boss 903; tooling studs 904 are adapted to pass through inner magnet assembly mounting holes 702 and are tightened by tooling nuts 10. The positioning lower boss 903 and the positioning groove 701 for positioning are arranged so that the screw connection part is close to the screw connection part, and the fastening force directly acts on the matching surface with the shortest path, so that the positioning between the assembly fixture 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, and an inner magnetic assembly stud 306 is provided at the center of the positioning table 305, where the inner magnetic assembly stud 306 penetrates into the inner magnetic assembly mounting hole 702 and is fastened by an inner magnetic assembly nut 4. Besides the advantages of stable positioning and connection, the device also solves the problem that the inner magnetic assembly 3 is mounted and fixed, and because the inner magnetic assembly 3 is positioned at the innermost side of the whole device, the inner magnetic assembly is generally in accordance with the assembly sequence from inside to outside in the assembly process, and is not easy to be effectively fixed as a part which is mounted earlier.
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 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 member at the bottom; the insulating base 5 is sleeved outside the columnar member and inserted into the distributor mounting hole 706. As shown in fig. 11, the distance d between the outer edges of the insulating holders 5 at the opposite positions is smaller than the outer diameter of the positioning upper boss 901, and a diameter-reduced section 902 is provided between the positioning upper boss 901 and the positioning lower boss 903, the diameter of the diameter-reduced section 902 being not larger than the distance d. In the use state, the height of the reduced diameter section 902 is larger than the height of the insulating base 5. The reducing section 902 can avoid the interference of the oversized insulating seat 5 on the assembly tool 9 during operation, and the reducing section 902 avoids the insulating seat 5 in the height and width directions, namely the axial direction and the radial direction of the Hall thruster, so that the installation of the insulating seat 5 with a larger size can be ensured, and the insulating performance level 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 a circular sinking groove, so that turning is convenient, particularly when the lower positioning boss 903 and the upper positioning boss 901 are coaxial, turning can be conveniently carried out after clamping, and therefore higher assembly precision can be achieved through a simple structure and process.
Based on the above-described embodiment of the assembly method, in an alternative embodiment, a 0.02mm clearance fit is used 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 dispenser body 207. By adopting the matching, the assembly precision is ensured, the simplicity of the disassembly and assembly tool during the assembly operation is considered, and the assembly precision higher than 0.1mm can be finally realized, especially for the small-size Hall thruster, and the assembly precision is ensured.
Based on the above-mentioned embodiment of the assembly 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 interposed between the gas distributor 2 and the magnetically conductive base plate 7, the gas distributor 2 and the magnetically conductive base plate 7 are fixed. An insulating seat 5 is arranged between the gas distributor 2 and the magnetic conduction bottom plate 7, so that the gas distributor 2 can play the role of an anode, and electric power is prevented from being conducted to other parts of the Hall thruster.
Based on the above-described embodiment of the assembly 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 columnar 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 dispenser mounting hole 706 is provided to have a diameter larger than that of the insertion portion of the insulating holder 5 to form a gap for adjusting the position; similarly, the diameter of the insulating seat through hole 501 is larger than the diameter of the column. In step S30, the insulating holder 5 is inserted in the dispenser mounting hole 706, and the column is inserted in the insulating holder through hole 501.
The gas distributor 2 is provided with a column at the bottom to facilitate self-fixing and gas path arrangement, and the diameter of the insertion part of the insulating base 5 and the column relative to the matching hole is smaller, so that a gap capable of adjusting the relative position of the gas distributor 2 and the magnetic conduction bottom plate 7 is created, and the column can be placed at a proper position under the guiding action of the assembling tool 9 and then fixed. And unnecessary stress caused by bending deformation of the columnar member relative to the magnetic conductive bottom plate 7 due to too small related holes is avoided.
Based on the above-described 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 insulating holders 5 in the opposite positions is smaller than the outer diameter of the positioning upper boss 901, step S10 is further included before step S20: the insulating holder 5 is inserted into the dispenser mounting hole 706. This prevents the excessively large insulating seat 5 from interfering with the assembly fixture 9 during operation.
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 attached to the column at the bottom by fillet welding, leaving a sloping fillet 204; an insulator seat counterbore 502 adapted to receive the fillets 204 is provided at an end of the insulator seat throughbore 501 adjacent the fillets 204. In step S30, when the gas distributor 2 is inserted into the final stage, the fillets 204 are inserted into the insulator seat counterbore 502, and the bottom surface of the gas distributor 2 abuts the top surface of the insulator seat 5.
Specifically, as shown in fig. 7, the insulating holder 5 of the present embodiment includes an insulating holder body 503 and an insulating holder stud 504 provided at one end of the insulating holder body 503, the insulating holder through hole 501 penetrates the insulating holder body 503 and the insulating holder stud 504, and the insulating holder counterbore 502 is provided on the insulating holder body 503; the outer diameter of the insulating seat body 503 is greater than the diameter of the dispenser mounting hole 706; the insulator seat stud 504 is inserted into the dispenser mounting hole 706 and tightened by the insulator seat nut 6.
This is because the most common way of assembling the gas distributor 2 is welding, in which fillet welding is often used for welding the pillar and the distributor body 207, and fillet welding may generate sloping fillets 204, which cause the root of the pillar to become larger, and the heights of the fillets 204 are generally inconsistent, if the insulating seat counter bore 502 for accommodating the fillets 204 is not provided, the actual heights of the gas distributors 2 after being plugged to the bottom of each batch will be different, so that the product consistency will be poor, and the sloping fillets 204 and the finer aperture fit will be easily worn, so that not only the connection strength will be damaged, but also the position of the gas distributor 2 in the axial direction of the hall thruster will be easily loosened, and the equipment will be unstable. The insulating seat counter bore 502 can avoid the installation error caused by the welding leg 204, so that the axial installation accuracy of the gas distributor 2 is ensured.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. The high-precision assembly fixture for the Hall thruster is characterized by comprising a magnetic conduction bottom plate (7), an inner magnetic assembly (3) and a gas distributor (2), wherein the gas distributor (2) is annular, the inner magnetic assembly (3) is provided with a central axis, the Hall thruster further comprises an insulating seat (5), the magnetic conduction bottom plate (7) is provided with a distributor mounting hole (706) around a positioning groove (701), and the bottom of the gas distributor (2) is provided with a columnar piece; the insulating seat (5) is sleeved outside the columnar piece and inserted into the distributor mounting hole (706);
it comprises the following steps: a positioning upper boss (901) and a positioning lower boss (903) arranged 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 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 positioning lower boss (903) is inserted into the positioning groove (701), the outer side surface of the positioning upper boss (901) is coaxial with the central axis of the inner magnetic assembly (3).
2. The high-precision assembly fixture of the Hall thruster according to claim 1, wherein an inner magnetic assembly mounting hole (702) is arranged on a magnetic conduction bottom plate (7), and a fixture stud (904) is arranged on a positioning lower boss (903); the tooling studs (904) are adapted to be threaded into the inner magnet assembly mounting holes (702) and tightened by the tooling nuts (10).
3. The high-precision assembly fixture of the Hall thruster according to claim 1, wherein the distance d between the outer edges of the insulating seats (5) at opposite positions is smaller than the outer diameter of the positioning upper boss (901), a diameter-reducing section (902) is arranged between the positioning upper boss (901) and the positioning lower boss (903), and the diameter of the diameter-reducing section (902) is not larger than the distance d; when in a use state, the height of the diameter-reducing section (902) is larger than the height of the insulating seat (5).
4. A high precision assembly fixture for a hall thruster according to any one of claims 1 to 3, characterized in that the positioning lower boss (903) is a circular boss.
5. The assembly method is characterized by comprising the steps of assembling a Hall thruster, wherein 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 the positioning groove (701); the method comprises the following steps:
s20: inserting a positioning lower boss (903) into a positioning groove (701) by using the high-precision assembly fixture of the hall thruster according to any one of claims 1 to 4, and fixing the high-precision assembly fixture of the hall thruster with a magnetic conduction bottom plate (7);
s30: the gas distributor (2) is sleeved outside the high-precision assembly tool of the Hall thruster, and the outer side surface of the positioning upper boss (901) is matched with the inner side surface of the distributor main body (207) during insertion; after the gas distributor (2) is sleeved in place, the gas distributor (2) is fixed with the magnetic conduction bottom plate (7);
s40: the high-precision assembly fixture of the Hall thruster is detached from the magnetic conduction 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 the magnetic conduction bottom plate (7);
s60: the magnetic conductive shell component (1) is fixed with the magnetic conductive bottom plate (7).
6. The assembly method according to claim 5, wherein a clearance fit of 0.02mm is used between the positioning table (305) and the positioning groove (701), between the positioning lower boss (903) and the positioning groove (701), and between the positioning upper boss (901) outer side and the dispenser body (207) inner side.
7. The assembly method according to claim 5, wherein when the hall thruster further comprises an insulating seat (5), in step S30, after the insulating seat (5) is interposed between the gas distributor (2) and the magnetically permeable base plate (7), the gas distributor (2) and the magnetically permeable base plate (7) are fixed.
8. The assembling method according to claim 7, 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), step S10 is further included before step S20: the insulating holder (5) is inserted into the dispenser mounting hole (706).
9. The assembling method according to claim 8, 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 columnar member at the bottom, the insulating seat (5) is provided in a sleeve shape having an insulating seat through hole (501), and in step S10, the diameter of the distributor mounting hole (706) is set to be larger than the diameter of the inserted portion of the insulating seat (5), and the diameter of the insulating seat through hole (501) is set to be larger than the diameter of the columnar member;
in step S30, the insulating holder (5) is inserted in the dispenser mounting hole (706), and the columnar member is inserted in the insulating holder through hole (501).
10. The assembly method according to claim 7, characterized in that the gas distributor (2) is connected to the column at the bottom by fillet welding, leaving a sloping fillet (204); an insulating seat counter bore (502) suitable for accommodating the welding leg (204) is arranged at one end of the insulating seat through hole (501) close to the welding leg (204), and in step S30, when the gas distributor (2) is sleeved in the final stage, the welding leg (204) enters the insulating seat counter bore (502) and the bottom surface of the gas distributor (2) is abutted with the top surface of the insulating seat (5).
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| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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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| CN115673760A CN115673760A (en) | 2023-02-03 |
| CN115673760B true CN115673760B (en) | 2023-05-12 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007120424A (en) * | 2005-10-28 | 2007-05-17 | Mitsubishi Electric Corp | Hall thruster and aerospace vehicle |
| CN205960897U (en) * | 2016-08-23 | 2017-02-15 | 深圳市航天电机系统有限公司 | Brushless motor hall mounting structure |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7059111B2 (en) * | 2003-10-24 | 2006-06-13 | Michigan Technological University | Thruster apparatus and method |
| JP2007071055A (en) * | 2005-09-05 | 2007-03-22 | Osaka Univ | Hall thruster having magnetic circuit having magnetic field concentrating structure |
| CN105003409A (en) * | 2015-07-16 | 2015-10-28 | 兰州空间技术物理研究所 | Cathode center layout of Hall thruster |
| CN107165793B (en) * | 2017-06-12 | 2019-10-01 | 北京航空航天大学 | A kind of electric propulsion engine gas distributor |
| CN107165794B (en) * | 2017-06-12 | 2019-10-01 | 北京航空航天大学 | A kind of adjustable low-power hall thruster with magnetic screening effect in magnetic field |
| CN110307132B (en) * | 2019-05-24 | 2020-09-18 | 北京控制工程研究所 | Hall thruster positioning structure for improving gas uniformity |
| CN110439770B (en) * | 2019-07-24 | 2020-06-19 | 北京航空航天大学 | Anode layer Hall thruster of deep integrated hollow cathode |
| CN112431732B (en) * | 2020-11-20 | 2021-08-20 | 北京航空航天大学 | Double-magnetic-ring micro cylindrical Hall thruster for friction welding anode |
-
2023
- 2023-01-03 CN CN202310000675.5A patent/CN115673760B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007120424A (en) * | 2005-10-28 | 2007-05-17 | Mitsubishi Electric Corp | Hall thruster and aerospace vehicle |
| CN205960897U (en) * | 2016-08-23 | 2017-02-15 | 深圳市航天电机系统有限公司 | Brushless motor hall mounting structure |
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| CN115673760A (en) | 2023-02-03 |
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