A full perimeter reluctance coupling for a 2D proportional flow valve

Abstract

A full circumference magnetic resistance coupling for 2D proportional flow valve, comprising an inner spiral frame and an outer spiral frame which are nested, an output shaft is connected on the rotation axis of the inner spiral frame, an outer spiral tooth and an inner spiral tooth are respectively arranged on the inner wall of the outer spiral frame and the corresponding position of the outer wall of the inner spiral frame, a magnetic circuit air gap is formed at the corresponding circumference surface of the outer spiral frame and the inner spiral frame and the spiral tooth, a pair of closed loop magnetic circuits are formed by the magnetic lines of force through the magnetic circuit air gaps, the closed loop magnetic circuits comprise a left closed loop magnetic circuit and a right closed loop magnetic circuit, and at least one magnetic component is contained in the left closed loop magnetic circuit and the right closed loop magnetic circuit. The full circumference magnetic resistance design of the inner spiral frame and the outer spiral frame realizes the closure of the magnetic circuit, can effectively reduce the leakage coefficient of the permanent magnet, and can also make the circumference air gap be reduced to almost zero (objective physical phenomenon: the magnetic force size is exponentially increased with the reduction of the magnetic circuit air gap), so that the utilization rate of the permanent magnet can be greatly improved.

Description

Technical Field

[0001] This invention relates to magnetic couplings in the field of fluid transmission, and more particularly to a full-circumferential magnetic reluctance coupling for a 2D proportional flow valve. Background Technology

[0002] Electro-hydraulic servo control systems are widely used in important strategic industrial fields such as aerospace and military weaponry due to their high dynamic response and high control precision. Servo valves, as the core component of electro-hydraulic control systems, play a crucial role in the performance of the entire system; however, their high cost makes them difficult to promote in the civilian sector. Compared to servo valves, electro-hydraulic proportional valves, with lower manufacturing costs and static and dynamic characteristics that meet civilian requirements, have emerged. However, because they require an additional pilot stage, pilot valves suffer from problems such as complex structure, large size, and low power-to-weight ratio.

[0003] In recent years, two-dimensional valves (2D valves), proposed by Ruan Jian et al. based on the theory of two-degree-of-freedom motion of valve cores, have been widely used in military and aerospace fields. 2D valves integrate the pilot stage and power stage into a single valve core, offering advantages such as simpler structure, higher power-to-weight ratio, and stronger resistance to contamination compared to traditional multi-stage pilot control structures. However, traditional 2D valves require a rotary motor converter to drive the two-degree-of-freedom motion of the valve core. Compared to commercially available direct-acting proportional electromagnets that are already in mass production, rotary motor converters are expensive to manufacture and have a smaller market.

[0004] To reduce costs and promote the civilian application of 2D valves, Li Sheng et al. proposed a novel, special mechanical linear-rotary motion coupling. This coupling connects a direct-acting proportional electromagnet and a 2D proportional flow valve, enabling displacement feedback and motion conversion. This allows the previously expensive rotary motor to be replaced with a commercially available proportional electromagnet, significantly reducing the cost of using the 2D proportional flow valve. Building on Li Sheng et al.'s work, Liu Guowen et al. proposed a displacement-amplification coupling to shorten the actual working stroke of the proportional electromagnet and improve system response speed. However, this also resulted in a relatively complex structure and poor control accuracy. Zuo Qiang et al. proposed an elastic compression-torsion coupling that transmits flexible torque through low-friction elastic force. However, this coupling suffers from poor valve linearity due to the influence of spring radial stiffness and torque saturation. Zuo Qiang et al. also proposed a ball screw coupling that transmits force through full rolling friction. This coupling has significant advantages such as high transmission efficiency, fewer transmission components, and simple structure, but it suffers from hysteresis and poor linearity.

[0005] The defects of these mechanical linear-rotary couplings mainly stem from the adverse effects of mechanical friction and wear on the static characteristics of the flow proportional valve, such as linearity, repeatability, and hysteresis. Furthermore, mechanical couplings themselves require lubrication, and the vibration and noise that accompany their operation will also reduce the valve's service life.

[0006] To eliminate the adverse effects of friction and wear in mechanical couplings, Meng Bin et al. proposed a novel magnetic repulsion coupling. This magnetic coupling utilizes magnetic repulsion to suspend the inner mover and valve core within the outer mover, offering advantages such as zero friction and wear, low vibration, low noise, and no lubrication required. It is expected to significantly improve the control accuracy, static characteristics, and service life of 2D proportional flow valves. However, this magnetic repulsion coupling suffers from problems such as incomplete magnetic circuit closure and insufficient space utilization, resulting in low magnetic energy utilization, large size, and a large amount of permanent magnets. Furthermore, it has drawbacks such as the need for additional molds due to the complex magnetic sheet structure, and the need for customized installation fixtures due to assembly difficulties. Summary of the Invention

[0007] To overcome the above problems, the present invention provides a full-circumferential magnetic reluctance coupling for a 2D proportional flow valve.

[0008] The technical solution adopted in this invention is: a full-circumferential magnetic reluctance coupling for a 2D proportional flow valve, comprising an inner and outer spiral frame that are fitted together, the inner and outer spiral frames being concentrically assembled; an output shaft is connected to the rotation axis of the inner spiral frame, the direction of which is left-right, defined as the Z-axis of three-dimensional coordinates, with the left direction being the positive Z-axis; the direction perpendicular to the rotation axis in the horizontal plane is the front-back direction, defined as the Y-axis of three-dimensional coordinates, with the back direction being the positive Y-axis; the up-down direction is the X-axis, with the up direction being the positive X-axis; the direction closer to the rotation axis is considered inside, and the opposite direction is considered outside;

[0009] The inner wall of the outer spiral frame and the outer wall of the inner spiral frame are respectively provided with outer spiral teeth and inner spiral teeth at corresponding positions; magnetic air gaps are formed at the corresponding circumferential surfaces and spiral teeth of the outer spiral frame and the inner spiral frame, and magnetic lines of force form a pair of closed-loop magnetic circuits through each magnetic air gap. The closed-loop magnetic circuit includes a left closed-loop magnetic circuit and a right closed-loop magnetic circuit, and each of the left closed-loop magnetic circuit and the right closed-loop magnetic circuit contains at least one magnetic component.

[0010] The outer spiral frame includes, from left to right, an end cap, a left yoke, a left permanent magnet ring, an outer spiral ring, a right permanent magnet ring, and a right yoke. Both the left and right yokes are concentric cylindrical in shape. The left end of the left yoke contacts the end cap, and the right end of the left yoke contacts the left permanent magnet ring; the left end of the right yoke contacts the right end of the right permanent magnet ring. The left and right ends of the outer spiral ring contact the left and right permanent magnet rings, respectively. The left yoke is connected to the outer spiral ring via the left permanent magnet ring, and the right yoke is connected to the outer spiral ring via the right permanent magnet ring. The inner wall of the outer spiral ring has several external spiral teeth evenly spaced inwards along the circumference. The external spiral teeth are inclined at an angle β to the XOY plane, and the end faces of all external spiral teeth are parallel to the XOY plane. The external spiral teeth on the outer spiral ring are magnetized into external spiral magnetic teeth.

[0011] The inner spiral frame has several internal spiral teeth evenly spaced outwards at positions corresponding to the outer spiral teeth. The internal spiral teeth are inclined at an angle β to the XOY plane, and the end faces of all internal spiral teeth are parallel to the XOY plane. The internal spiral teeth are magnetized into internal spiral magnetic teeth. The magnetic pole surface at the left circumference of the inner spiral frame is a full circumference surface centered on the rotation axis. The magnetic pole surface at the internal spiral teeth of the inner spiral frame is a number of spiral surfaces centered on the rotation axis. The magnetic pole surface at the right circumference of the inner spiral frame is a full circumference surface centered on the rotation axis.

[0012] In equilibrium, the inner circumferential surface of the outer helical tooth overlaps with the outer circumferential surface of the inner helical tooth; the gap between the inner and outer circumferential surfaces of the outer and inner helical teeth is δ, that is, the air gap formed in the magnetic circuit is δ; both the left and right permanent magnet rings are magnetized along the Z-axis and their polarities are opposite; the magnetization direction of the left permanent magnet ring is the positive Z-axis direction, and the magnetization direction of the right permanent magnet ring is the negative Z-axis direction. The left and right permanent magnet rings magnetize the left yoke, the outer helical ring, the right yoke, and the inner helical frame and generate a magnetizing magnetic field; in the working state, the outer helical frame makes a linear motion displacement along the Z-axis to drive the inner helical frame to rotate along the rotation axis; the inner helical frame can make a linear motion displacement along the Z-axis while rotating.

[0013] Furthermore, the left circumferential surface and the inner helical teeth of the inner helical frame form a left closed-loop magnetic circuit with the left yoke, left permanent magnet ring, and outer helical ring of the outer helical frame through a magnetic circuit air gap. The inner circumferential surface of the left yoke is spaced δ1 from the left circumferential surface of the inner helical frame, and the inner circumferential surface of the outer helical teeth is spaced δ2 from the outer circumferential surface of the inner helical teeth. The right circumferential surface and the inner helical teeth of the inner helical frame form a right closed-loop magnetic circuit with the right yoke, right permanent magnet ring, and outer helical ring of the outer helical frame through a magnetic circuit air gap. The inner circumferential surface of the right yoke is spaced δ3 from the right circumferential surface. Let δ1 = δ2 = δ3 = δ.

[0014] Furthermore, the end cap is made of non-magnetic material, and the left yoke, outer spiral ring, right yoke, and inner spiral frame are all made of DT material.

[0015] Furthermore, the left permanent magnet ring and the right permanent magnet ring attract the left yoke, the outer spiral ring and the right yoke together with the end cap to form an outer spiral frame through their own magnetic force.

[0016] Furthermore, the end cap has a countersunk hole, and the end faces of the left and right permanent magnet rings have through holes. The end faces of the left yoke, outer spiral ring, and right yoke have threaded holes. The end cap, left yoke, left permanent magnet ring, and outer spiral ring are fixed by screws, and the outer spiral ring, right permanent magnet ring, and right yoke are fixed by screws.

[0017] The principle of this invention is as follows: As shown in Figure 11, the initial equilibrium position is such that the inner circumferential surface of the outer spiral tooth 71 of the outer spiral ring 7 overlaps with the outer circumferential surface of the inner spiral tooth 31 of the inner spiral frame 3. The force distribution between the pair of inner and outer spiral teeth in the outer spiral ring 7 and the inner spiral frame 3 is shown in Figure 13. The inner spiral tooth 31 on the inner spiral frame 3 experiences an outward magnetic attraction force F1 from the outer spiral tooth 71 of the outer spiral ring 7. Since all the inner and outer spiral teeth are evenly distributed, the magnetic attraction force experienced by each inner spiral tooth 31 on the inner spiral frame 3 is equal in magnitude and uniformly emitted outwards. At this point, the total magnetic attraction force experienced by the inner spiral frame 3 is zero, and it is in the initial equilibrium position. As shown in Figure 12, the working state is such that the outer spiral ring 7, during its single-degree-of-freedom movement along the positive Z-axis, experiences a misalignment with the inner spiral frame 3. Figure 14 shows the force situation of a pair of inner and outer helical teeth in the outer helical ring 7 and the inner helical frame 3. The inner helical tooth 31 on the inner helical frame 3 is subjected to an outwardly inclined magnetic attraction force F2 from the outer helical tooth 71 on the outer helical ring 7. The radial component of the magnetic attraction force F2 is F2r, and the tangential component is F2t. Since all the inner and outer helical teeth are uniformly distributed, the radial component Fr of the magnetic attraction force on each inner helical tooth 31 on the inner helical frame 3 is the same in magnitude and is uniformly emitted outward. The tangential component Ft of the magnetic attraction force on each inner helical tooth is the same in magnitude and is tangential in direction along the circumferential direction. At this time, the total radial magnetic attraction force on the inner helical frame 3 is zero, and the total tangential magnetic attraction force forms a torque M (clockwise along the Z-axis). Figure 15 As shown, the inner screw carrier 3, subjected to a torque M, begins to rotate clockwise along the Z-axis. A linear displacement of the outer screw ring 7 corresponds to a rotation angle of the inner screw carrier 3, and the two are proportional.

[0018] The beneficial effects of this invention are:

[0019] 1. The present invention provides a full-circumferential magnetic reluctance coupling for a 2D proportional flow valve, wherein the full-circumferential magnetic reluctance design of the inner and outer spiral frames realizes the closure of the magnetic circuit, which can effectively reduce the leakage coefficient of the permanent magnet, and at the same time reduce the circumferential air gap to almost zero (objective physical phenomenon: the magnetic force increases exponentially as the air gap of the magnetic circuit decreases). In this solution, the utilization rate of the permanent magnet can be greatly improved.

[0020] 2. The full-circumference magnetic reluctance coupling for 2D proportional flow valve designed in this invention innovatively uses a non-contact magnetic reluctance force transmission scheme, which makes the entire motion process frictionless, wear-free, high-speed, and high-precision, fundamentally avoiding the adverse effects on the linearity, repeatability, and hysteresis of the static characteristics of the 2D proportional flow valve.

[0021] 3. The present invention discloses a full-circumferential magnetic reluctance coupling for a 2D proportional flow valve, wherein the outer screw frame 2 is designed to have one degree of freedom of linear motion (linear motion along the Z-axis as shown in Figure 12), and the inner screw frame 3 is designed to have two degrees of freedom of linear-rotational motion (rotation along the Z-axis as shown in Figure 12). After the outer screw frame 2 is subjected to thrust, it drives the inner screw frame 3 to generate torque. This new topology of the magnetic coupling realizes the transmission of thrust to torque.

[0022] 4. The full-circumference magnetic reluctance coupling for 2D proportional flow valves designed in this invention innovatively uses a full-circumference structure, which has the advantages of high space utilization and small size while meeting the requirements of the static and dynamic characteristics of the system.

[0023] 5. The full-circumferential magnetic reluctance coupling for 2D proportional flow valves designed in this invention uses a circular magnetic sheet structure, which is simple in structure and does not require the processing of additional molds. At the same time, it is easy to assemble and does not require the customization of additional installation fixtures. Therefore, the overall structure has low processing cost and high economic benefits.

[0024] 6. The present invention provides a full-circumferential reluctance coupling for a 2D proportional flow valve, wherein a linear displacement of the outer screw carrier 2 corresponds to a rotation angle of the inner screw carrier 3 in a proportional relationship. It exhibits stable performance under low-frequency operating conditions. Attached Figure Description

[0025] Figure 1 This is an assembly diagram of the present invention;

[0026] Figure 2 This invention can be broken down into an outer spiral frame and an inner spiral frame;

[0027] Figure 3 This is an exploded view of the outer spiral frame of the present invention;

[0028] Figure 4 This is a schematic diagram of the end cap structure of the present invention;

[0029] Figure 5 This is a schematic diagram of the left yoke structure of the present invention;

[0030] Figure 6 This is a schematic diagram of the left (right) permanent magnet ring structure of the present invention;

[0031] Figure 7This is a schematic diagram of the outer spiral ring structure of the present invention;

[0032] Figure 8 This is a schematic diagram of the right yoke structure of the present invention;

[0033] Figure 9 This is a schematic diagram of the inner spiral frame structure of the present invention;

[0034] Figure 10 This is a schematic diagram of the magnetization direction and magnetic field of the permanent magnet of the present invention;

[0035] Figures 11a-11c This is a schematic diagram of the outer spiral ring 7 and the inner spiral frame 3 in their initial equilibrium state, where... Figure 11a This is an isometric view of the outer spiral ring 7 and the inner spiral bracket 3 in their initial equilibrium state. Figure 11b This is a front view of the outer spiral ring 7 and the inner spiral frame 3 in their initial equilibrium state. Figure 11c This is an isometric view of a pair of inner and outer spiral teeth I in the initial equilibrium state of the outer spiral ring 7 and the inner spiral frame 3;

[0036] Figures 12a-12c This is a schematic diagram showing the misalignment between the outer spiral ring 7 and the inner spiral frame 3 when the outer spiral ring 7 moves along the positive Z-axis. Figure 12a This is an isometric view of the outer spiral ring 7 and the inner spiral bracket 3 when the outer spiral ring 7 moves and becomes misaligned along the positive Z-axis. Figure 12b This is a front view of the outer spiral ring 7 and the inner spiral bracket 3 when the outer spiral ring 7 moves and becomes misaligned along the positive Z-axis. Figure 12c The isometric view of the outer spiral ring 7 and a pair of inner and outer spiral teeth II in the inner spiral frame 3 when the outer spiral ring 7 moves and becomes misaligned along the positive Z-axis.

[0037] Figures 13a-13b This is a schematic diagram of the outer spiral ring 7 and a pair of inner and outer spiral teeth I in the inner spiral frame 3 in the initial equilibrium state, where, Figure 13a This is a top view of a pair of inner and outer helical teeth I in their initial equilibrium state. Figure 13b A cross-sectional view of a pair of inner and outer helical teeth I in the initial equilibrium state;

[0038] Figures 14a-14b This is a schematic diagram showing a pair of inner and outer helical teeth II in the outer helical ring 7 and the inner helical frame 3 when the outer helical ring 7 moves along the positive Z-axis and misalignment occurs. Figure 14a This is a top view of a pair of inner and outer helical teeth II when misalignment occurs. Figure 14b This is a BB cross-sectional view of a pair of inner and outer helical teeth II when misalignment occurs;

[0039] Figure 15The torque generated by the attraction of the outer spiral ring 7 on the inner spiral frame 3 (clockwise along the Z-axis) after the outer spiral ring 7 moves along the positive Z-axis.

[0040] Figure 16 This is an assembly diagram showing the present invention connected to a proportional electromagnet and a 2D proportional flow valve.

[0041] Figures 17a-17d This is a schematic diagram illustrating the working principle of the present invention used in a 2D proportional flow valve, wherein... Figure 17a This is a schematic diagram showing that the proportional electromagnet 11 is not outputting displacement and the valve core 13 is in an initial equilibrium state. Figure 17b This is a schematic diagram showing the valve core 13 rotating in the working state (the proportional electromagnet 11 outputs linear displacement in the positive Z-axis direction). Figure 17c This is a schematic diagram showing the valve core 13 in a linear displacement state during operation. Figure 17d This is a schematic diagram showing the valve core 13 rotating in the reverse direction during operation. Detailed Implementation

[0042] The technical solution of this invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without inventive effort are within the scope of protection of this invention.

[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Example 1

[0046] See attached document Figure 1-15 A full-circumferential reluctance coupling for a 2D proportional flow valve includes an inner screw frame 3 and an outer screw frame 2, which are concentrically assembled. An output shaft is connected to the rotation axis of the inner screw frame 3. The direction of the rotation axis is left-right, defined as the Z-axis in three-dimensional coordinates, with the left direction as the positive Z-axis. The direction perpendicular to the rotation axis in the horizontal plane is front-back, defined as the Y-axis in three-dimensional coordinates, with the rear direction as the positive Y-axis. The up-down direction is the X-axis, with the up direction as the positive X-axis. The direction closer to the rotation axis is considered inside, and the opposite direction is considered outside.

[0047] The outer spiral frame 2 has an outer spiral tooth 71 and an inner spiral tooth 31 respectively at the corresponding positions of the outer spiral frame 3 and the inner spiral frame 2. Magnetic air gaps are formed at the corresponding circumferential surfaces and spiral teeth of the outer spiral frame 2 and the inner spiral frame 3. Magnetic lines of force form a pair of closed-loop magnetic circuits through each magnetic air gap. The closed-loop magnetic circuit includes a left closed-loop magnetic circuit and a right closed-loop magnetic circuit. The left closed-loop magnetic circuit and the right closed-loop magnetic circuit contain at least one magnetic component.

[0048] The outer spiral frame 2 includes, from left to right, an end cap 4, a left yoke 5, a left permanent magnet ring 6, an outer spiral ring 7, a right permanent magnet ring 8, and a right yoke 9. Both the left yoke 5 and the right yoke 9 are concentric cylindrical in shape. The left end of the left yoke 5 contacts the end cap 4, and the right end of the left yoke 5 contacts the left permanent magnet ring 6. The left end of the right yoke 9 contacts the right end of the right permanent magnet ring 8. The left and right ends of the outer spiral ring 7 contact the left permanent magnet ring 6 and the right permanent magnet ring 8, respectively. The left yoke 5 is connected to the outer spiral ring 7 via the left permanent magnet ring 6, and the right yoke 9 is connected to the outer spiral ring 7 via the right permanent magnet ring 8. The inner wall of the outer spiral ring 7 is uniformly provided with several outer spiral teeth 71 along the circumferential direction. The outer spiral teeth 71 are inclined at an angle β to the XOY plane, and the end faces of all the outer spiral teeth 71 are parallel to the XOY plane. The outer spiral teeth 71 on the outer spiral ring 7 are magnetized into outer spiral magnetic teeth.

[0049] The inner spiral frame 3 has a plurality of inner spiral teeth 31 evenly spaced outward at positions corresponding to the outer spiral teeth 71. The inner spiral teeth 31 are inclined at an angle β to the XOY plane, and the end faces of all the inner spiral teeth 31 are parallel to the XOY plane. The inner spiral teeth 31 are magnetized into inner spiral magnetic teeth. The magnetic pole surface at the left circumference of the inner spiral frame 3 is a full circumference surface centered on the rotation axis. The magnetic pole surface at the inner spiral teeth 31 of the inner spiral frame 3 is a plurality of spiral surfaces centered on the rotation axis. The magnetic pole surface at the right circumference of the inner spiral frame 3 is a full circumference surface centered on the rotation axis.

[0050] In the embodiments of the present invention, the outer spiral frame 2 and the inner spiral frame 3 are concentrically assembled. In equilibrium, the inner circumferential surface of the outer spiral tooth 71 overlaps with the outer circumferential surface of the inner spiral tooth 31, and the gap between them is δ, thus forming a magnetic circuit air gap of δ. The left permanent magnet ring 6 and the right permanent magnet ring 8 are both magnetized along the Z-axis direction, and their polarities are opposite. The magnetization direction of the left permanent magnet ring 6 is the positive Z-axis direction, and the magnetization direction of the right permanent magnet ring 8 is the negative Z-axis direction. The left permanent magnet ring 6 and the right permanent magnet ring 8 magnetize the left yoke 5, the outer spiral ring 7, the right yoke 9, and the inner spiral frame 3, generating a magnetizing magnetic field. Since the outer spiral frame 2 and the inner spiral frame 3 are concentrically assembled, this geometric relationship allows the magnetic circuit air gap δ to be reduced to a very small size (theoretically, the air gap can approach zero). The size of the magnetic circuit air gap δ has a significant impact on the magnetic force; the smaller the air gap, the greater the magnetic force, exhibiting an exponential relationship. The outer screw frame 2 can move linearly along the Z-axis for a certain distance, and the inner screw frame 3 can move linearly along the Z-axis for a certain distance, while simultaneously rotating a certain angle along the rotation axis.

[0051] The working principle of this invention is broken down as shown in Figures 11, 12, 13, 14, and 15. Figure 11 shows the initial equilibrium position, where the inner circumferential surface of the outer spiral tooth 71 of the outer spiral ring 7 overlaps with the outer circumferential surface of the inner spiral tooth 31 of the inner spiral frame 3. Figure 13 shows the force distribution between a pair of inner and outer spiral teeth on the outer spiral ring 7 and the inner spiral frame 3. The inner spiral tooth 31 on the inner spiral frame 3 experiences an outward magnetic attraction force F1 from the outer spiral tooth 71 of the outer spiral ring 7. Since all the inner and outer spiral teeth are evenly distributed, the magnetic attraction force on each inner spiral tooth 31 on the inner spiral frame 3 is equal in magnitude and uniformly emitted outwards. At this point, the total magnetic attraction force on the inner spiral frame 3 is zero, placing it in the initial equilibrium position. Figure 12 shows the working state, where the outer spiral ring 7, during its single-degree-of-freedom movement along the positive Z-axis, experiences a misalignment with the inner spiral frame 3. Figure 14 shows the force situation of a pair of inner and outer helical teeth in the outer helical ring 7 and the inner helical frame 3. The inner helical tooth 31 on the inner helical frame 3 is subjected to an outwardly inclined magnetic attraction force F2 from the outer helical tooth 71 on the outer helical ring 7. The radial component of the magnetic attraction force F2 is F2r, and the tangential component is F2t. Since all the inner and outer helical teeth are uniformly distributed, the radial component Fr of the magnetic attraction force on each inner helical tooth 31 on the inner helical frame 3 is the same in magnitude and is uniformly emitted outward. The tangential component Ft of the magnetic attraction force on each inner helical tooth is the same in magnitude and is tangential in direction along the circumferential direction. At this time, the total radial magnetic attraction force on the inner helical frame 3 is zero, and the total tangential magnetic attraction force forms a torque M (clockwise along the Z-axis). Figure 15 As shown, the inner screw carrier 3, subjected to a torque M, begins to rotate clockwise along the Z-axis. A linear displacement of the outer screw ring 7 corresponds to a rotation angle of the inner screw carrier 3, and the two are proportional.

[0052] Example 2

[0053] Reference Figure 16-1 7. The full-circumference magnetic reluctance coupling described in Example 1 is used in a 2D proportional flow valve, and its assembly drawing is as follows. Figure 16 As shown, the proportional electromagnet 11 is fixed on the base 12. The push rod of the proportional electromagnet 11 is fixedly connected to the end cap 4 of the full-circumferential magnetic reluctance coupling 1. The 2D proportional flow valve includes a valve core 13, a valve sleeve 14, and a plug 15. The valve core 13 of the 2D proportional flow valve is fixedly connected to the inner screw frame 3 of the full-circumferential magnetic reluctance coupling 1. The full-circumferential magnetic reluctance coupling 1 converts the linear displacement in the Z direction output by the proportional electromagnet 11 into the rotation angle of the valve core 13 of the 2D proportional flow valve through the form of thrust-to-torque conversion.

[0054] The specific working principle of the present invention for the 2D proportional flow valve is shown in Figure 17. 17a is the balanced state. Due to the hydraulic resistance half-bridge effect (high pressure oil flows into the high pressure groove 20 through the high pressure hole 19, and reaches the low pressure groove 17 through the sensing channel 18, where the sensing channel 18 is connected to the sensing chamber 21), since the overlapping area of ​​the high and low pressure grooves and the sensing channel is the same, the pressure of the sensing chamber 21 is half the pressure of the high pressure chamber 16, and the force-bearing area of ​​the valve core 13 at the sensing chamber 21 is twice the force-bearing area at the high pressure chamber 16. In addition, the helical teeth of the inner and outer helical frames are in a completely overlapping state and do not output torque. Therefore, the valve core is in a balanced state. Figure 17b In the rotating state, after the proportional electromagnet 11 is energized, it pushes the outer screw frame 2 to move along the positive direction of the Z-axis. At this time, the overlapping surfaces of the inner and outer helical teeth are misaligned, and the valve core 13 is pulled by the magnetic attraction to rotate clockwise along the positive direction of the Z-axis. Figure 17c In a linear motion state, the rotation of valve core 13 causes a change in the overlap area between the high and low pressure grooves on the valve core control stage and the sensing channel 18, resulting in a rapid increase in pressure in the sensing chamber 21. This breaks the force balance of valve core 13, and valve core 13 moves linearly along the positive Z-axis under the action of pressure differential force. Figure 17d In the reverse rotation state, the linear motion of the valve core causes the overlapping surfaces of the inner and outer helical teeth to misalign again. The valve core 13 is then pulled counterclockwise along the positive Z-axis by the magnetic attraction until the inner and outer helical teeth are fully overlapped. Simultaneously, the reverse rotation of the valve core 13 causes a rapid decrease in pressure in the sensitive chamber 21, and the valve core 13 returns to a new position of force equilibrium. If the push rod of the proportional electromagnet 11 moves in the negative Z-axis direction, the above process is reversed. During the movement, the displacement of the valve core 13 follows the displacement of the proportional electromagnet 11 in a 1:1 ratio, thus enabling proportional control of the 2D proportional flow valve.

[0055] The embodiments described in this specification are merely examples of implementations of the inventive concept. The scope of protection of this invention should not be considered as limited to the specific forms stated in the embodiments. The scope of protection of this invention also extends to equivalent technical means that can be conceived by those skilled in the art based on the inventive concept.

Claims

1. A full-circumferential magnetic reluctance coupling for a 2D proportional flow valve, characterized in that: The system includes an inner spiral frame (3) and an outer spiral frame (2) that are fitted together. The inner spiral frame (3) and the outer spiral frame (2) are concentrically assembled. The output shaft is connected to the rotation axis of the inner spiral frame (3). The direction of the rotation axis is left-right, which is defined as the Z-axis of the three-dimensional coordinate system, with the left direction as the positive direction of the Z-axis. The direction perpendicular to the rotation axis in the horizontal plane is the front-back direction, which is defined as the Y-axis of the three-dimensional coordinate system, with the back direction as the positive direction of the Y-axis. The up-down direction is the X-axis, with the up direction as the positive direction of the X-axis. The direction closer to the rotation axis is considered inside, and the opposite direction is considered outside. The inner wall of the outer spiral frame (2) and the outer wall of the inner spiral frame (3) are respectively provided with outer spiral teeth (71) and inner spiral teeth (31); the outer spiral frame (2) and the inner spiral frame (3) form magnetic air gaps at their corresponding circumferential surfaces and spiral teeth, and the magnetic lines of force form a pair of closed-loop magnetic circuits through each magnetic air gap. The closed-loop magnetic circuits include a left closed-loop magnetic circuit and a right closed-loop magnetic circuit, and each of the left closed-loop magnetic circuit and the right closed-loop magnetic circuit contains at least one magnetic component. The outer spiral frame (2) includes, from left to right, an end cap (4), a left yoke (5), a left permanent magnet ring (6), an outer spiral ring (7), a right permanent magnet ring (8), and a right yoke (9). The left yoke (5) and the right yoke (9) are both concentric cylindrical in shape. The left end of the left yoke (5) is in contact with the end cap (4), and the right end of the left yoke (5) is in contact with the left permanent magnet ring (6). The left end of the right yoke (9) is in contact with the right end of the right permanent magnet ring (8). The left and right ends of the outer spiral ring (7) are respectively in contact with the left permanent magnet ring (6). Contact with the right permanent magnet ring (8); the left yoke (5) is connected to the outer spiral ring (7) through the left permanent magnet ring (6), and the right yoke (9) is connected to the outer spiral ring (7) through the right permanent magnet ring (8); the inner wall surface of the outer spiral ring (7) is uniformly provided with a number of outer spiral teeth (71) in the circumferential direction, the outer spiral teeth (71) are inclined at an angle β with the XOY plane, and the end face of all the outer spiral teeth (71) is parallel to the XOY plane; the outer spiral teeth (71) on the outer spiral ring (7) are magnetized into outer spiral magnetic teeth; The inner spiral frame (3) has a number of inner spiral teeth (31) evenly distributed outwards at the positions corresponding to the outer spiral teeth (71). The inner spiral teeth (31) are inclined at an angle β to the XOY plane. The end faces of all the inner spiral teeth (31) are parallel to the XOY plane. The inner spiral teeth (31) are magnetized into inner spiral magnetic teeth. The magnetic pole surface at the left circumference of the inner spiral frame (3) is a full circumference surface with the rotation axis as the center. The magnetic pole surface at the inner spiral teeth (31) of the inner spiral frame (3) is a number of spiral surfaces with the rotation axis as the center. The magnetic pole surface at the right circumference of the inner spiral frame (3) is a full circumference surface with the rotation axis as the center. In equilibrium, the inner circumferential surface of the outer helical tooth (71) overlaps with the outer circumferential surface of the inner helical tooth (31); the gap between the inner circumferential surface of the outer helical tooth (71) and the outer circumferential surface of the inner helical tooth (31) is δ, that is, the air gap of the magnetic circuit is δ; the left permanent magnet ring (6) and the right permanent magnet ring (8) are both magnetized along the Z-axis direction and their polarities are opposite; the magnetization direction of the left permanent magnet ring (6) is the positive direction of the Z-axis, and the magnetization direction of the right permanent magnet ring (8) is the negative direction of the Z-axis. The left permanent magnet ring (6) and the right permanent magnet ring (8) magnetize the left yoke (5), the outer helical ring (7), the right yoke (9) and the inner helical frame (3) and generate a magnetizing magnetic field; in the working state, the outer helical frame (2) makes a linear motion displacement along the Z-axis to drive the inner helical frame (3) to rotate along the rotation axis; the inner helical frame (3) can make a linear motion displacement along the Z-axis while rotating.

2. The full-circumferential magnetic reluctance coupling for a 2D proportional flow valve as described in claim 1, characterized in that: The inner spiral frame (3) and the inner spiral teeth (31) form a left closed-loop magnetic circuit through the magnetic air gap with the left yoke (5), left permanent magnet ring (6), and outer spiral ring (7) of the outer spiral frame (2). The inner circumferential surface of the left yoke (5) and the left circumferential surface of the inner spiral frame (3) are spaced apart. The inner circumferential surface of the outer helical tooth (71) is spaced from the outer circumferential surface of the inner helical tooth (31). The inner spiral frame (3) and the inner spiral tooth (31) form a right closed-loop magnetic circuit through the magnetic circuit air gap with the right yoke (9), right permanent magnet ring (8), and outer spiral ring (7) of the outer spiral frame (2). The inner circumferential surface of the right yoke (9) and the right circumferential surface are spaced apart. ,make .

3. The full-circumferential magnetic reluctance coupling for a 2D proportional flow valve as described in claim 1, characterized in that: The end cap (4) is made of non-magnetic material, and the left yoke (5), outer spiral ring (7), right yoke (9) and inner spiral frame (3) are all made of DT4 material.

4. The full-circumferential magnetic reluctance coupling for a 2D proportional flow valve as described in claim 1, characterized in that: The left permanent magnet ring (6) and the right permanent magnet ring (8) attract the left yoke iron (5), the outer spiral ring (7) and the right yoke iron (9) together with the end cap (4) to form the outer spiral frame (2).

5. The full-circumferential reluctance coupling for a 2D proportional flow valve as described in claim 1, characterized in that: The end cap (4) has a countersunk hole, and the end faces of the left permanent magnet ring (6) and the right permanent magnet ring (8) have through holes. The end faces of the left yoke (5), the outer spiral ring (7) and the right yoke (9) have threaded holes. The end cap (4), the left yoke (5), the left permanent magnet ring (6) and the outer spiral ring (7) are fixed by screws. The outer spiral ring (7), the right permanent magnet ring (8) and the right yoke (9) are fixed by screws.

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