Magnetic plasma electric propulsion jet secondary pinch magnetic mirror field adjusting mechanism

Abstract

The invention provides a magnetic plasma electric propulsion jet secondary pinch magnetic mirror field adjusting mechanism. The device is composed of an integrated mounting bottom plate, a displacement mechanism, a displacement mechanism base, a moving platform, a driving piece, a rolling bearing, a bearing fixing pin, a secondary driving sliding groove, a permanent magnet fixing tool assembly, a rectangular permanent magnet, a permanent magnet fixing plate, a permanent magnet positioning clamp, a driven piece, a primary driven sliding groove, a rotating shaft and a hinge base. According to the device, a driving piece is dragged through a displacement mechanism, so that a permanent magnet fixing tool assembly provided with a driven piece is driven, the driving process is divided into two stages of driving a first-stage driven sliding groove through a first-stage driving rod and driving a second-stage driven rod through a second-stage driving sliding groove, and the two stages of the first stage are connected. Therefore, the 0-90-degree inclination angle of the permanent magnet fixing tool assembly can be controlled by a 100mm-stroke small displacement mechanism, and the expansion and contraction degree of a magnetic plasma electric propulsion jet secondary pinch magnetic mirror field can be adjusted to the maximum extent.

Description

Technical Field

[0001] The present invention belongs to the field of space plasma electric propulsion, and particularly relates to a magnetic plasma electric propulsion jet secondary pinch magnetic mirror field adjustment mechanism. Background Art

[0002] Since the 21st century, efficient space propulsion technology has been a limitation for humans to explore a wider space. Therefore, space propulsion technology with higher specific impulse and higher efficiency has always been a forefront hot topic of concern in the international aerospace community. Space electric propulsion technology uses electromagnetic fields to heat and ionize the working medium to generate plasma, and accelerates the plasma to form a high-speed jet to generate thrust. Compared with traditional chemical propulsion relying on combustion, electric propulsion can achieve a cross-order-of-magnitude increase in specific impulse, and is an ideal power choice for current satellite Internet constellations, future manned lunar landings, deep space exploration and other space strategic missions.

[0003] Magnetic plasma electric propulsion is a high-power electromagnetic acceleration plasma electric propulsion technology, with the characteristics of large thrust and high specific impulse. Magnetic plasma electric propulsion usually uses a single-body multi-turn coaxial coil as the magnetic field source to form a divergent magnetic nozzle configuration magnetic field, which is difficult to effectively confine the plasma jet. In this regard, an inclined permanent magnet array is introduced to form a secondary pinch magnetic mirror to generate a boundary maximum magnetic field configuration to efficiently confine the plasma. However, the layout of the permanent magnet array and the design scheme of the adjustment mechanism are currently lacking. Summary of the Invention

[0004] The present invention proposes a magnetic plasma electric propulsion jet secondary pinch magnetic mirror field adjustment mechanism, providing an online adjustment mechanism design scheme for the plasma confinement magnetic field configuration of high-power magnetic plasma electric propulsion jets.

[0005] A magnetic plasma electric propulsion jet secondary pinch magnetic mirror field adjustment mechanism provided by the present invention includes an integrated installation base plate, a displacement mechanism, a permanent magnet fixing tooling assembly, a rotating shaft, a hinge base, etc.

[0006] The first part, the integrated installation base plate is made of stainless steel and presents a circular ring structure. The inner hole is used to place the magnetic plasma electric thruster; a long circular hole array is opened on the integrated installation base plate for fixing the displacement mechanism and the hinge base connected to the permanent magnet fixing tooling assembly;

[0007] The second part, the displacement mechanism is a single lead screw structure driven by a stepping motor, which includes a displacement mechanism base, a moving platform, a driving piece, a rolling bearing, a bearing fixing pin and a secondary driving chute;

[0008] The displacement mechanism base is integrated with a stepping motor, a lead screw and a lead screw driving slider, and the slider is used to connect the moving platform;

[0009] The mobile platform is provided with multiple threaded fixing holes, which are respectively used to connect with the slider of the displacement mechanism base and the driving piece;

[0010] The driving piece is integrally in an L-shaped plate structure, provided with a through hole with a diameter of 3 mm, and is connected to the mobile platform through an M3 bolt;

[0011] The driving piece is provided with an M2 threaded hole, and the bearing fixing pin is connected to the threaded hole to fix the rolling bearing on the driving piece, forming a primary driving rod for driving the primary driven chute in the permanent magnet fixing tooling assembly;

[0012] The driving piece is provided with a secondary driving chute in the shape of an inclined single-sided open long circular hole for driving the secondary driven rod in the permanent magnet fixing tooling assembly;

[0013] In an alternative embodiment, the outer diameter of the rolling bearing is 6 mm, the secondary driving chute is inclined at an angle of 45°, and the width is 6 mm;

[0014] The third part, the permanent magnet fixing tooling assembly includes a rectangular permanent magnet, a permanent magnet fixing plate, a permanent magnet positioning clamp, a driven piece, a bearing fixing pin, a rolling bearing, and a primary driven chute;

[0015] The rectangular permanent magnet is in a cuboid structure and is made of a high-temperature resistant permanent magnet material.

[0016] In an alternative embodiment, the size of the permanent magnet is 150 mm × 100 mm × 25 mm, made of high-temperature resistant samarium cobalt alloy, and the magnetization direction is the normal direction of the 150 mm × 100 mm plane, pointing to the central symmetry axis of the integrated installation base plate.

[0017] The permanent magnet fixing plate is in an aluminum alloy plate structure with a thickness of 3 mm, and is provided with an array of M3 threaded holes on the side for installing the permanent magnet positioning clamp and the driven piece; at one end of the permanent magnet fixing plate, there is a through hole with a diameter of 3 mm and a rectangular hinge connection port for connecting to the hinge base on the integrated installation base plate;

[0018] The positioning clamp is an L-shaped metal structural part with a through hole with a diameter of 3 mm at one end. The 3 mm through hole is used to connect with the threaded hole on the side of the permanent magnet fixing plate, and the L-shaped structure is used to fasten the rectangular permanent magnet. The positioning clamps are symmetrically distributed on the outside of the rectangular permanent magnet to position the rectangular permanent magnet;

[0019] The driven piece is integrally in a rectangular plate structure, provided with a through hole with a diameter of 3 mm, and is connected to the side of the permanent magnet fixing plate through an M3 screw;

[0020] The driven plate is provided with M2 threaded holes, and the bearing fixing pin is connected to the threaded holes to fix the rolling bearing on the driven plate, forming a secondary driven rod for cooperating with the secondary driving chute on the displacement mechanism and reciprocating under the drive of the secondary driving chute;

[0021] The driven plate is provided with a primary driven chute for cooperating with the primary driving rod on the displacement mechanism and reciprocating under the drive of the primary driving rod;

[0022] The primary driven chute is a one-sided open long circular hole, and the open end is an arc-shaped expanded opening to facilitate the off-track of the primary driving rod on the displacement mechanism at the end of the movement;

[0023] In an alternative embodiment, the width of the straight segment of the primary driven chute is 6 mm;

[0024] In the fourth part, the rotating shaft is of a screw structure, connecting the rectangular hinge interface and the hinge base at one end of the permanent magnet fixing plate, and being fixed and limited by nuts at both ends;

[0025] The hinge base is an L-shaped aluminum alloy component, with a threaded opening on one side, connected to the long circular hole array on the integrated installation base plate through bolts, and a through hole at one end for passing through the rotating shaft to form a hinge assembly with the permanent magnet fixing plate;

[0026] In an alternative embodiment, the diameter of the through hole at one end of the hinge base is 3.1 mm, and the diameter of the rotating shaft is 3 mm, forming a clearance fit between the two to ensure the smooth opening and closing of the hinge;

[0027] Integrating the above process, the device can realize the permanent magnet array layout and adjustment of the magnetic plasma electric propulsion secondary pinch magnetic mirror.

[0028] The beneficial effects of the present invention compared with the prior art:

[0029] 1. Fill the gap in the online adjustment mechanism of the permanent magnet magnetic field for magnetic plasma electric propulsion;

[0030] 2. Realize the online real-time adjustment of the contraction-expansion of the magnetic plasma electric propulsion secondary pinch magnetic mirror;

[0031] 3. Change the position where the magnetic field maximum value appears, and realize the focusing control of the maximum value magnetic field at different radial positions on the magnetic plasma electric propulsion jet. Brief Description of the Drawings

[0032] Figure 1 It is a structural assembly drawing of the magnetic plasma electric propulsion jet secondary pinch magnetic mirror field adjustment mechanism provided by the embodiment of the present invention.

[0033] Figure 2Vertical view of the displacement mechanism of the magnetic plasma electro - propulsion jet secondary pinch magnetic mirror field regulating mechanism provided by the embodiment of the present invention, connected to the integrated installation base plate.

[0034] Figure 3 Schematic diagram of the connection between the displacement mechanism of the magnetic plasma electro - propulsion jet secondary pinch magnetic mirror field regulating mechanism provided by the embodiment of the present invention and the permanent magnet fixing tooling assembly.

[0035] Figure 4 Schematic diagram of the driving piece structure of the magnetic plasma electro - propulsion jet secondary pinch magnetic mirror field regulating mechanism provided by the embodiment of the present invention.

[0036] Figure 5 Horizontal view of the connection between the permanent magnet fixing tooling assembly of the magnetic plasma electro - propulsion jet secondary pinch magnetic mirror field regulating mechanism provided by the embodiment of the present invention and the integrated installation base plate.

[0037] Figure 6 Schematic diagram of the displacement mechanism driving the permanent magnet fixing tooling assembly to move in the magnetic plasma electro - propulsion jet secondary pinch magnetic mirror field regulating mechanism provided by the embodiment of the present invention.

[0038] Figure 7 Schematic diagram of the evolution of the magnetic field bimodal structure of the magnetic plasma electro - propulsion jet secondary pinch magnetic mirror field regulating mechanism provided by the embodiment of the present invention.

[0039] The label descriptions in the figure are as follows:

[0040] 1. Integrated installation base plate; 2. Displacement mechanism; 201. Displacement mechanism base; 202. Moving platform

[0041] 203. Driving piece; 204. Rolling bearing; 205. Bearing fixing pin; 206. Secondary driving chute

[0042] 3. Permanent magnet fixing tooling assembly; 301. Rectangular permanent magnet; 302. Permanent magnet fixing plate

[0043] 303. Permanent magnet positioning clamp; 304. Driven piece; 305. Bearing fixing pin; 306. Rolling bearing

[0044] 307. Primary driven chute; 4. Rotating shaft; 5. Hinge base; 6. Magnetic plasma thruster

[0045] 7. Magnetic plasma electro - propulsion jet Detailed implementation manners

[0046] The present invention provides a magnetic plasma electric propulsion jet secondary pinch magnetic mirror field adjustment mechanism. The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.

[0047] In the description of the present invention, it should be noted that the terms "left side", "right side", "vertical", "horizontal", "upper", "lower", "inner", "outer", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings. These are only for the convenience of describing the present invention, and do not indicate or imply that the device or structural member referred to must have a specific orientation. Therefore, it should not be construed as a limitation of the present invention.

[0048] As Figure 1 shown, a magnetic plasma electric propulsion jet secondary pinch magnetic mirror field adjustment mechanism provided in this embodiment includes, from left to right in sequence: an integrated installation base plate 1, a displacement mechanism 2, a permanent magnet fixing tooling assembly 3, a rotating shaft 4, a hinge base 5, a magnetic plasma electric thruster 6, and a magnetic plasma electric propulsion jet 7.

[0049] Among them, the magnetic plasma electric thruster 6 and the magnetic plasma electric propulsion jet 7 do not belong to the scope of the magnetic plasma electric propulsion jet secondary pinch magnetic mirror field adjustment mechanism of the present invention.

[0050] Its specific working steps are as follows:

[0051] Step 1: As Figure 1 , place the integrated installation base plate 1 vertically and keep it coaxial with the magnetic plasma electric thruster 6; as Figure 2 and 3 , install the displacement mechanism base 201 in the elongated hole of the integrated installation base plate 1; as Figure 4 , pass the bearing fixing pin 205 through the rolling bearing 204 and install it in the M2 threaded hole on the driving piece 203 to form a primary driving rod; as Figure 3 , connect the driving piece 203 with the primary driving rod to the moving platform 202 by bolts and further fix it on the displacement mechanism base with bolts, so as to drive the driving piece 203 to reciprocate up and down by the displacement mechanism stepping electrode. Thus, the displacement mechanism 2 is assembled.

[0052] Step 2: As Figure 3, place the rectangular permanent magnet 301 on the permanent magnet fixing plate 302; install 6 permanent magnet positioning clamps 303 on the front, left, and right sides of the permanent magnet fixing plate through bolts for left-right positioning; use 2 bolts for up-down positioning at the lower end of the rectangular permanent magnet 301; pass the bearing fixing pin 5 through the rolling bearing 6 and install it in the M2 threaded hole on the driven piece 304 to form a secondary driven rod; fix the driven piece 304 with the secondary driven rod in the threaded hole on the left side of the permanent magnet fixing plate 302 through bolts. Thus, the permanent magnet fixing tooling assembly 3 is installed completely;

[0053] Step 3: As Figure 2 and 5 , fix the hinge base 5 on the long circular hole array on the integrated installation base plate 1 through bolts; snap the rectangular hinge interface at the lower end of the permanent magnet fixing plate 302 in the permanent magnet fixing tooling assembly 3 into the hinge base 5, and slide the primary driving rod (composed of the rolling bearing 204 and the bearing fixing pin 205) into the primary driven slot 307; insert the rotating shaft 4 into the through hole with a diameter of 3.1 mm at the lower end of the permanent magnet fixing plate 302, and install fixing nuts at both ends of the rotating shaft 4. Thus, all mechanical components are installed completely;

[0054] Step 4: As Figure 6 ①, the displacement mechanism 2 pulls the driving piece 203, thereby driving the driven piece 304 to realize the inclination change of the permanent magnet fixing tooling assembly 3. The main movement process is divided into two stages; at the starting stage, the moving platform 202 of the displacement mechanism 2 is at the lowest position, and the driving piece 203 is at the lowest point position. At this time, the permanent magnet fixing tooling assembly 3 is horizontally placed; the stepping electrode of the displacement mechanism 2 drives the moving platform 202 to move upward, and the primary driving rod on the driving piece 203 slides in the primary driven slot 307 on the driven piece 304, thereby pulling the permanent magnet fixing tooling assembly 3 to rotate upward along the rotating shaft 4. This process is in the primary driving process;

[0055] Step 5: As Figure 6 ② and ③, as the driving piece 203 moves upward, the secondary driven rod gradually enters the secondary driving slot 206, and the primary driven rod gradually slides out of the primary driven slot 307. At this time, it is in the conversion stage between the primary driving process and the secondary driving process; as Figure 6 ③ and ④, the driving piece 203 moves upward, and the secondary driving slot 206 lifts the secondary driven rod upward to realize the upward rotation of the permanent magnet fixing tooling assembly 3. This process is in the secondary driving process until the permanent magnet fixing tooling assembly 3 moves to the vertical state.

[0056] The driving process of the driving piece 203 on the driven piece 304 is divided into two stages, which can form less restrictions on single-density driving, and realize the controllable adjustment of the permanent magnet fixing tooling assembly 3 from the horizontal position to the vertical position within the total stroke of 100 mm of the displacement mechanism 2, and realize the contraction and expansion of the maximum value position of the magnetic field of the magnetic plasma electric propulsion secondary pinch magnetic mirror along the radial direction, so as to provide effective constraint for the plasma jet.

Claims

1. A magnetic plasma electric propulsion jet secondary pinch magnetic mirror field regulating mechanism, characterized in that: The system consists of an integrated installation base plate, a displacement mechanism, a displacement mechanism base, a moving platform, a driving piece, a rolling bearing, a bearing fixing pin, a secondary driving chute, a permanent magnet fixing tooling assembly, a rectangular permanent magnet, a permanent magnet fixing plate, a permanent magnet positioning clamp, a driven piece, a primary driven chute, a rotating shaft, and a hinge base. Among them, the integrated installation base plate is coaxially placed with the magneto-plasma electric thruster and is used to fix the displacement mechanism, the permanent magnet tooling assembly, etc.; the displacement mechanism is used to traction the driving piece to move up and down; the driving piece is connected to the primary driven slot and the secondary driven rod on the driven piece through a primary driving rod and a secondary driving slot respectively, and is divided into two-stage driving processes to traction the driven piece to perform a large-stroke movement; the driven piece is fixed on the permanent magnet fixing tooling assembly and traction the permanent magnet fixing tooling assembly to move together; the permanent magnet fixing tooling assembly is used for fixing the rectangular permanent magnet and is installed on the integrated installation base plate through a hinge base and a rotating shaft to realize the inclination adjustment around the rotating shaft and adjust the contraction and expansion degree of the secondary pinch magnetic mirror field.

2. A magnetic plasma electric propulsion jet secondary pinch magnetic mirror field adjustment mechanism according to claim 1, characterized in that: The rectangular permanent magnet is fixed on the permanent magnet fixing plate through 6 permanent magnet positioning clamps and 2 positioning bolts, and is linked to the L-shaped hinge base through the permanent magnet fixing plate to form a hinge structure around the rotating shaft. The diameter of the through hole on the hinge base is 3.1 mm, and the diameter of the rotating shaft is 3 mm, forming a clearance fit to ensure smooth rotation.

3. The magnetic plasma electric propulsion jet secondary pinch magnetic mirror field regulating mechanism according to claim 1, wherein: The displacement mechanism traction the driving piece, and the driving of the permanent magnet fixing tooling assembly provided with the driven piece is divided into two stages to realize the control of the 0-90° inclination angle of the permanent magnet fixing tooling assembly by a small displacement mechanism with a 100 mm stroke.

4. A magnetic plasma electric propulsion jet secondary pinch magnetic mirror field adjusting mechanism according to claim 1 and claim 3, characterized in that: 2 sets of bearing fixing pins are inserted into the rolling bearings and fixed on the driving piece and the driven piece respectively to form a primary driving rod and a secondary driven rod. The bearing fixing pin is a T-shaped threaded pin, the specification of the threaded end is M2, the diameter of the middle shaft rod is 2 mm, the outer diameter of the T-shaped end is 5 mm, the outer diameter of the bearing is 6 mm, and it rolls in the primary driven chute and the secondary driving chute.

5. A magnetic plasma electric propulsion jet secondary pinch magnetic mirror field regulating mechanism according to claims 1, 3, and 4, characterized in that: The primary driving process is that the primary driving rod on the driving piece is embedded in the primary driven chute on the driven piece, and the displacement mechanism traction the driving piece and then drives the driven piece to move, realizing the upward rotation control of the permanent magnet fixing and installation component starting from the horizontal position.

6. A magnetic plasma electric propulsion jet two-stage pinch magnetic mirror field regulating mechanism according to claims 1, 3 and 4, characterized in that: The primary driven chute is a one-sided open long round hole, and the open end is an arc-shaped expanded opening to facilitate the off-track of the primary driving rod on the displacement mechanism at the end of the movement and control the driving speed to ensure the smooth sliding of the secondary driven rod into the secondary driving chute.

7. A magnetic plasma electric propulsion jet secondary pinch magnetic mirror field regulating mechanism according to claims 1, 3, and 4, characterized in that: The secondary driving process is that the secondary driven rod on the driven piece is embedded in the secondary driving chute on the driving piece, and the displacement mechanism traction the driving piece and then drives the driven piece to move, realizing the control of the upward rotation of the permanent magnet fixing and installation component until it reaches the 90° vertical state.

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