Surface-mounted permanent magnet suspension spiral coupling for 2D proportional flow valve

Abstract

A surface-mounted permanent magnet suspension spiral coupling for a 2D proportional flow valve comprises an outer mover component, and an inner mover component which rotates relative to the outer mover component and is concentrically assembled is arranged in the outer mover component in a sleeved mode. A plurality of outer magnetic strips are installed on the inner surface of the outer yoke component, a plurality of inner magnetic strips are installed on the outer surface of the inner rotor, the number of the installed inner magnetic strips and the number of the installed outer magnetic strips are the same, the magnetizing directions of the magnetic strips corresponding to the inner rotor and the outer yoke component are the same, and therefore a closed magnetic circuit is formed by the inner rotor and the adjacent inner magnetic strips and the adjacent outer magnetic strips opposite in magnetizing direction. A magnetic circuit air gap delta exists between the inner and outer magnetic strips, so that a magnetic suspension state is formed between the inner and outer rotors. A non-contact force transmission scheme is used, so that the whole movement process is free of friction and abrasion, high in speed and high in precision, and adverse effects on static characteristics such as linearity, repeatability and hysteresis of the 2D proportional flow valve are fundamentally avoided.

Description

Technical Field

[0001] The present invention relates to a magnetic coupling in the field of fluid transmission, and particularly to a surface-mounted permanent magnet suspension spiral coupling for a 2D proportional flow valve. Background Art

[0002] Electro-hydraulic servo control systems are widely used in important strategic industrial fields such as aerospace and military weapons due to their high dynamic response and high control precision. As the core component of the electro-hydraulic control system, the servo valve plays a crucial role in the performance of the entire electro-hydraulic system. However, due to its high cost, it is difficult to be popularized in the civilian field. Compared with the servo valve, the electro-hydraulic proportional valve with low processing cost and static and dynamic characteristics meeting civilian requirements has emerged. However, because it needs to be additionally equipped with a pilot stage, the pilot valve has problems such as complex structure, large volume, and low power-to-weight ratio.

[0003] In recent years, the two-dimensional valve (2D valve) proposed by Ruan Jian et al. based on the theory of two-degree-of-freedom motion of the spool has been widely used in the military and aerospace fields. The 2D valve integrates the pilot stage and the power stage into a single spool, and has the characteristics of simple structure, high power-to-weight ratio, and strong anti-pollution ability compared with the traditional multi-stage pilot control structure. However, the traditional 2D valve requires a rotary motor converter to drive the two-degree-of-freedom motion of the spool. Compared with the commercially available direct-acting proportional electromagnets that can be mass-produced, the rotary motor converter has a high manufacturing cost and a small market.

[0004] In order to reduce costs and popularize the 2D valve to the civilian field, Li Sheng et al. proposed a new type of special mechanical linear-rotary motion coupling. The direct-acting proportional electromagnet and the 2D proportional flow valve are connected through the linear-rotary motion coupling to achieve displacement feedback and motion conversion, which enables the originally expensive rotary motor to be replaced by a commercially available proportional electromagnet, thus greatly reducing the use cost of the 2D proportional flow valve. On the basis of Li Sheng et al., Liu Guowen et al. proposed a displacement amplification coupling to shorten the actual working stroke of the proportional electromagnet and improve the system response speed, but this also led to its relatively complex structure and poor control accuracy. Zuo Qiang et al. proposed an elastic compression-torsion coupling to transmit the flexible torque through the elastic force with low friction. However, the linearity of the valve is poor due to the influence of the radial stiffness of the spring and the torque saturation. Zuo Qiang et al. also proposed a ball screw coupling to achieve the transmission of force through full rolling friction, which has significant advantages such as high transmission efficiency, few transmission components, and simple structure. However, this structure has problems such as hysteresis and poor linearity.

[0005] The defects of the above-mentioned mechanical linear-rotary motion 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. Moreover, the mechanical couplings themselves require lubrication, and the accompanying vibration and noise during operation will also reduce the service life of the valve.

[0006] To eliminate the adverse effects brought about by the friction and wear of the mechanical coupling, Meng Bin et al. proposed a new type of magnetic repulsive coupling. This magnetic coupling uses magnetic repulsive force to suspend the inner rotor and the valve core in the outer rotor, and has the advantages of zero friction and wear, low vibration, low noise, and no need for lubrication. It is expected to greatly improve the control accuracy, static characteristics, and service life of the 2D proportional flow valve. However, this magnetic repulsive coupling has problems such as non-closed magnetic circuit and insufficient space utilization, resulting in low magnetic energy utilization rate, low power-weight ratio, large amount of permanent magnet used, and low torque ratio per unit magnetic consumption. Summary of the Invention

[0007] To overcome the above problems, the present invention provides a surface-mounted permanent magnet suspension spiral coupling for a 2D proportional flow valve.

[0008] The technical solution adopted by the present invention is: a surface-mounted permanent magnet suspension spiral coupling for a 2D proportional flow valve, including an outer rotor component, and an inner rotor component that is rotatably and concentrically assembled inside the outer rotor component;

[0009] The outer rotor component includes a left end cover (1), a linear bearing (2), an outer yoke iron component, and a right end cover (8); the outer yoke iron component includes two outer rotors (6), and the two outer rotors (6) are assembled into a cylindrical structure; the left end of the outer yoke iron component is connected to the left end cover (1), and the right end of the outer yoke iron component is connected to the right end cover (8); several outer magnetic strips (5) are provided on the inner side of the outer yoke iron component, and a first tooth (63) having the same shape as the outer magnetic strip (5) protrudes on the inner surface (64) of each outer rotor. A space for accommodating the outer magnetic strip (5) is formed between the two first teeth (63) on the inner side of the outer yoke iron component. The first tooth (63) is used to prevent the outer magnetic strip (5) from rotating circumferentially during operation; the several outer magnetic strips (5) are tightly arranged circumferentially between the two teeth (63) on the inner side of the outer yoke iron component, and the outer magnetic strips (5) are attached to the inner surface (64) of the outer rotor by their own magnetic force; the magnetization direction of each outer magnetic strip (5) is radial, and the magnetization directions of adjacent magnetic poles are opposite; the outer magnetic strip 5 forms an angle β with the vertical plane, and the end faces of all the outer magnetic strips 5 are parallel to the vertical plane;

[0010] The inner mover component includes an inner mover (3), an inner mover end cover (7), and a plurality of inner magnetic strips (4) mounted on the outer surface (32) of the inner mover; two second teeth (35) having the same shape as the inner magnetic strips (4) protrude from the inner mover surface (32), and the two second teeth (35) are evenly distributed on the inner mover surface (32). A space for accommodating the inner magnetic strips (4) is formed between the two inner mover surfaces (32). The second teeth (35) are used to prevent the inner magnetic strips (4) from rotating circumferentially during operation; a plurality of inner magnetic strips (4) are arranged closely along the circumference between the two second teeth (35) on the inner mover surface (32); the inner magnetic strips (4) are magnetically attached to the inner mover surface (32), and the magnetization direction of each inner magnetic strip (4) is radial, and the magnetization directions of adjacent magnetic poles are opposite; the assembled inner magnetic strips (4) form an angle β with the vertical plane, and the end faces of all inner magnetic strips (4) are parallel to the vertical plane; an output shaft (34) is connected to the rotation axis of the inner mover (3), and the output shaft (34) is supported in the left end cover (1) by a linear bearing (2).

[0011] The number of outer magnetic strips (5) is the same as that of the inner magnetic strips (4). In the balanced state, the outer magnetic strips (5) installed on the outer yoke are radially coincident with the corresponding inner magnetic strips (4) installed on the inner mover, and the magnetization directions are the same, so as to form a closed magnetic circuit with the inner and outer magnetic strips with opposite adjacent magnetization directions. There is a magnetic circuit air gap δ between the inner and outer magnetic strips; the outer magnetic strips (5) and the inner magnetic strips (4) generate a magnetization magnetic field on the outer yoke component and the inner mover; the outer mover component can perform a linear motion displacement along the rotation axis for a certain distance, and the inner mover component can perform a linear motion displacement along the rotation axis for a certain distance and can rotate a certain angle along the rotation axis.

[0012] Furthermore, the left end cover (1) and the right end cover (8) are both provided with shoulders that cooperate with the outer yoke component; through holes are opened in both the left end cover (1) and the right end cover (8), and threaded holes are opened on the left and right end faces of the outer mover (6). The outer mover (6), the left end cover (1), and the right end cover (8) are fixed by screws.

[0013] Furthermore, the outer mover (6) and the inner mover (3) are made of a metal soft magnetic material, while the left end cover (1), the inner mover end cover (7), and the right end cover (8) are made of a non-magnetic metal material.

[0014] The beneficial effects of the present invention are:

[0015] 1. A surface-mounted permanent magnet levitation spiral coupling for a 2D proportional flow valve designed by the present invention. The inner and outer magnetic strips are attracted to the inner and outer rotors by magnetic force, and the permanent magnets in this structure are used most fully. The adjacent magnetic strips have opposite magnetization directions to achieve magnetic circuit closure, which can reduce the length of the magnetic circuit to reduce magnetic energy loss. There is a magnetic circuit air gap δ, that is, the working air gap, between the inner and outer magnetic strips. The closer the excitation source is to the working air gap, the greater the air gap magnetic field strength that can be obtained, which can greatly improve the utilization rate of permanent magnets to transmit a relatively large force.

[0016] 2. A surface-mounted permanent magnet levitation spiral coupling for a 2D proportional flow valve designed by the present invention innovatively uses a non-contact force transmission scheme, which makes the entire movement process frictionless, wear-free, high-speed, and high-precision, fundamentally avoiding the adverse effects on the static characteristics such as linearity, repeatability, and hysteresis of the 2D proportional flow valve. At the same time, since lubrication is not required, no wear powder and lubricant evaporation will occur, so it can be used in a working environment with relatively strict cleanliness requirements.

[0017] 3. A surface-mounted permanent magnet levitation spiral coupling for a 2D proportional flow valve designed by the present invention. Its outer rotor component is designed for linear motion with one degree of freedom (linear motion along the Z-axis as shown in Figure 14), and the inner rotor component is designed for linear-rotary motion with two degrees of freedom (linear motion along the Z-axis and rotation as shown in Figure 14). After the outer rotor component inputs a thrust, it drives the inner rotor component to generate a torque. This new structure of the surface-mounted permanent magnet levitation coupling not only realizes the transmission of thrust to torque but also has a negative feedback effect.

[0018] 4. A surface-mounted permanent magnet levitation spiral coupling for a 2D proportional flow valve designed by the present invention innovatively distributes spiral-like magnetic strips circumferentially. On the premise of meeting the requirements of the static and dynamic characteristics of the system, it has the advantages of high space utilization rate, high magnetic energy utilization rate, large output torque, small volume, and high power-to-weight ratio.

[0019] 5. A surface-mounted permanent magnet levitation spiral coupling for a 2D proportional flow valve designed by the present invention uses a spiral-like magnetic strip shape. The structure is simple and does not require additional molds for processing. At the same time, the assembly is simple and does not require customized additional installation jigs. Therefore, the overall structure has low processing costs and high economic benefits.

[0020] 6. A surface-mounted permanent magnet levitation spiral coupling for a 2D proportional flow valve designed by the present invention. One linear displacement of the outer rotor component at the input end corresponds to one rotation angle of the inner rotor component at the output end and has a proportional relationship. Under low-frequency working conditions, the performance is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the present invention;

[0022] Figure 2 Schematic assembly diagram of the present invention;

[0023] Figure 3 Schematic structure diagram of the left end cover of the present invention;

[0024] Figure 4 Schematic structure diagram of the inner mover of the present invention;

[0025] Figure 5 Schematic assembly diagram of the inner mover and the inner magnetic strip of the present invention;

[0026] Figure 6 Schematic structure diagram of the inner magnetic strip of the present invention;

[0027] Figure 7 Schematic structure diagram of the outer magnetic strip of the present invention;

[0028] Figure 8 Schematic structure diagram of the outer mover of the present invention;

[0029] Figure 9 Schematic assembly diagram of the outer mover and the outer magnetic strip of the present invention;

[0030] Figure 10 Schematic structure diagram of the inner mover end cover of the present invention;

[0031] Figure 11 Schematic structure diagram of the right end cover of the present invention;

[0032] Figure 12 Magnetic circuit magnification diagram and permanent magnet magnetization direction schematic diagram of the outer mover component and the inner mover component of the present invention in the initial equilibrium state;

[0033] Figure 13 Magnetic circuit magnification diagram and permanent magnet magnetization direction schematic diagram of the inner mover component and the outer mover component when the outer mover component moves in the positive Z-axis direction and the inner mover component and the outer mover component are misaligned;

[0034] Figures 14a to 14c Schematic diagram of the outer mover component and the inner mover component in the initial equilibrium state, where, Figure 14a Isometric view of the outer mover component and the inner mover component in the initial equilibrium state, Figure 14b Front view of the outer mover component and the inner mover component in the initial equilibrium state, Figure 14c Isometric view of two pairs of inner and outer magnetic strips Ⅰ of the outer mover component and the inner mover component in the initial equilibrium state;

[0035] Figures 15a to 15c Schematic diagram of the inner mover component and the outer mover component when the outer mover component moves in the positive Z-axis direction and the inner mover component and the outer mover component are misaligned, where, Figure 15aAn isometric view when the inner mover component and the outer mover component are misaligned when the outer mover component moves in the positive Z-axis direction. Figure 15b A front view when the inner mover component and the outer mover component are misaligned when the outer mover component moves in the positive Z-axis direction. Figure 15c An isometric view when two pairs of inner and outer magnetic strips II in the outer mover component and the inner mover component are misaligned.

[0036] Figures 16a to 16b A schematic diagram of a pair of inner and outer magnetic strips I in the outer mover component and the inner mover component in the initial equilibrium state, where Figure 16a A top view of a pair of inner and outer magnetic strips I in the initial equilibrium state. Figure 16b An A-A sectional view of a pair of inner and outer magnetic strips I in the initial equilibrium state.

[0037] Figures 17a to 17b A schematic diagram of a pair of inner and outer magnetic strips II in the inner mover 3 and the outer mover 6 when the inner mover component and the outer mover component are misaligned when the outer mover component moves in the positive Z-axis direction, where Figure 17a A top view of a pair of inner and outer magnetic strips II when misaligned. Figure 17b A B-B sectional view of a pair of inner and outer magnetic strips II when misaligned.

[0038] Figure 18 The torque (clockwise along the Z-axis) generated when the inner mover component is attracted by the outer mover component after the outer mover component moves in the negative Z-axis direction.

[0039] Figure 19 An assembly drawing of the present invention connected to a proportional electromagnet and a 2D proportional flow valve.

[0040] Figures 20a to 20d A working principle diagram of the present invention for a 2D proportional flow valve, where Figure 20a A schematic diagram when the proportional electromagnet 91 does not output displacement and the valve core 93 is in the initial equilibrium state. Figure 20b A schematic diagram when the valve core 93 is in a rotating state under the working condition (the proportional electromagnet 91 outputs a linear displacement in the negative Z-axis direction). Figure 20c A schematic diagram when the valve core 93 is in a linear displacement state under the working condition. Figure 20d A schematic diagram when the valve core 93 is in a reverse rotation state under the working condition.

[0041] Description of the reference numerals in the drawings: 1. Left end cover; 2. Linear bearing; 3. Inner rotor; 4. Inner magnetic strip; 5. Outer magnetic strip; 6. Outer rotor; 7. Inner rotor end cover; 8. Right end cover; 11. Shaft for installing the linear bearing on the left end cover 1; 12. Hole for installing the linear bearing 2 on the left end cover 1; 13. End face of the left end cover 1 that mates with the end face 62 of the outer rotor 6; 14. Shoulder on the left end face of the left end cover 1; 31. Left end face of the inner rotor 3; 32. Outer surface of the inner rotor 3; 33. Shoulder on the right end face of the inner rotor 3; 34. Shaft for installing the inner rotor 3 on the right end with the linear bearing 2; 35. Teeth protruding on the outer surface 32 of the inner rotor 3 and having the same shape as the inner magnetic strip 4; 61. Concave and convex grooves where the two outer rotors 6 engage with each other; 62. Left and right end faces of the outer rotor 6; 63. Teeth protruding on the inner surface 64 of the outer rotor 6 and having the same shape as the outer magnetic strip 5; 64. Inner surface of the outer rotor 6; 71. Left end face of the inner rotor end cover 7; 72. Shoulder on the left end face of the inner rotor end cover 7; 81. Left end face of the right end cover 8; 82. Shoulder on the left end face of the right end cover 8. Detailed implementation manners

[0042] The technical solutions of the present invention patent will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0043] In the description of the present invention, it should be noted that, when terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it should not be construed as a limitation to the present invention. In addition, when terms such as "first", "second", "third" are used only for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, when terms such as "installation", "connection", "linkage" are used, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] Embodiment 1

[0046] Referring to the attached drawings, a surface-mounted permanent magnet levitation spiral coupling for a 2D proportional flow valve, as Figure 1 and Figure 2 shown, includes an outer yoke iron component, a left end cover 1, a linear bearing 2, an inner rotor 3, an inner magnetic strip 4, an outer magnetic strip 5, an inner rotor end cover 7, and a right end cover 8. The outer yoke iron component consists of two outer rotors 6. The outer rotors 6 are fitted together through concave and convex grooves 61 to form a cylindrical outer yoke iron component. The concave and convex grooves enable the outer yoke iron component to bear axial force. The outer yoke iron component connects the two outer rotors 6 by fitting the shoulders on its left and right end faces with the shoulders 14 of the left end cover 1 and the shoulders 82 of the right end cover 8. The left end cover 1 is connected to the inner rotor 3 through the linear bearing 2, which can ensure that the inner rotor and the outer rotor component are coaxial during movement. To prevent the outer magnetic strip 5 from rotating circumferentially during operation, two teeth 63 with the same shape as the outer magnetic strip 5 protrude from the inner surface 64 of the outer yoke iron component and are evenly distributed on the inner surface 64 of the outer yoke iron component.

[0047] The permanent magnets include an inner magnetic strip 4 and an outer magnetic strip 5. The inner magnetic strip is radially magnetized into N and S poles, and the magnetization directions are divided into radially inward and radially outward. The inner surface of the inner magnetic strip 4 adheres to the outer surface 32 of the inner rotor by magnetic force. The magnetization directions of adjacent inner magnetic strips 4 are installed on the surface 32 of the inner rotor 3 in a reverse order. There is no gap between the magnetic strips to form a circumferential surface. The outer magnetic strip is radially magnetized into N and S poles, and the magnetization directions are divided into radially inward and radially outward. The outer surface of the outer magnetic strip 5 adheres to the inner surface 64 of the outer rotor by magnetic force. The magnetization directions of adjacent outer magnetic strips 5 are installed on the surface 64 of the outer rotor 6 in a reverse order. There is no gap between the magnetic strips to form a circumferential surface. The number of inner and outer magnetic strips installed on the inner rotor and the outer yoke iron component is the same, and the magnetization directions of the corresponding inner and outer magnetic strips on the inner rotor and the outer yoke iron component are the same. The installed inner magnetic strip 4 and outer magnetic strip 5 are both inclined at an angle β with respect to the vertical plane (XOY plane), and the end faces of all inner and outer magnetic strips are parallel to the XOY plane. The left end cover 1 and the right end cover 8 are made of non-magnetic materials, and the outer rotor 6 is made of DT4 material (soft magnetic material, which is very easy to be magnetized), which can enhance the magnetic field in the external space. The left end cover 1 and the right end cover 8 are provided with through holes, and threaded holes are provided on the left and right end faces of the outer rotor 6. The outer rotor 6, the left end cover 1, and the right end cover 8 are fixed by screws.

[0048] An output shaft is connected to the rotation axis of the inner rotor 3. The direction of the rotation axis is the left-right direction, which is defined as the Z-axis of the three-dimensional coordinate system, with the leftward direction being the positive direction of the Z-axis; the front-back direction is the X-axis of the three-dimensional coordinate system, with the backward direction being the positive direction of the X-axis; the up-down direction is the Y-axis, with the upward direction being the positive direction of the Y-axis. In order to prevent the inner magnetic strip 4 from rotating circumferentially during operation, two teeth 35 having the same shape as the inner magnetic strip 4 protrude from the surface 32 of the inner rotor 3 and are evenly distributed on the surface 32 of the inner rotor 3. In order to prevent the inner magnetic strip 4 from moving axially and radially during operation, the left end face 31 of the inner rotor 3 is connected to the inner rotor end cover 7 by screws, and the right end face of the inner rotor 3 has a shoulder 33. In order to ensure the concentricity between the inner rotor 3 and the outer rotor 6 during operation, the shaft 34 of the inner rotor 3 is supported in the left end cover 1 by a linear bearing 2. The material used for the inner rotor 3 is DT4, and the inner rotor end cover 7 is made of a non-magnetic material. The inner rotor end cover 7 is fixed to one end of the inner rotor 3 by screws.

[0049] A number of outer magnetic strips 5 are installed on the inner surface of the outer yoke iron component, and a number of inner magnetic strips 4 are installed on the outer surface 32 of the inner rotor. The number of installed inner and outer magnetic strips is the same, and the magnetization directions of the magnetic strips corresponding to the inner rotor and the outer yoke iron component are the same, so as to form a closed magnetic circuit with the inner and outer magnetic strips whose adjacent magnetization directions are opposite; there is a magnetic circuit air gap δ between the inner and outer magnetic strips, so that a "magnetic levitation" state is formed between the inner and outer rotors.

[0050] In the embodiment of the present invention, the outer rotor component moves along the Z-axis to drive the inner rotor 3 to perform a rotational motion.

[0051] In the embodiment of the present invention, the outer rotor component includes a left end cover 1, a linear bearing 2, an outer yoke iron component, a right end cover 8, and a number of outer magnetic strips installed on the inner surface 64 of the outer rotor 6, and the inner rotor component includes an inner rotor 3, an inner rotor end cover 7, and a number of inner magnetic strips installed on the outer surface 32 of the inner rotor 3.

[0052] In the embodiment of the present invention, the outer rotor 6 and the inner rotor 3 are made of a high-permeability metal soft magnetic material, while the left end cover 1, the inner rotor end cover 7, and the right end cover 8 are made of a non-magnetic metal material.

[0053] In the embodiments of the present invention, the axial center lines of the outer mover component and the inner mover component are located on the same straight line, i.e., coaxially arranged. In the balanced state, the outer magnetic strips installed on the outer yoke are radially coincident with the inner magnetic strips installed on the corresponding inner mover, and the magnetization directions are the same, so as to form a closed magnetic circuit with the inner and outer magnetic strips with opposite magnetization directions adjacent to each other. There is a magnetic circuit air gap δ between the inner and outer magnetic strips. The inner and outer magnetic strips generate a magnetization magnetic field on the outer yoke component and the inner mover. Since the outer mover component and the inner mover component are concentrically assembled, such a geometric relationship enables the magnetic circuit air gap δ to be reduced to a very small value (in theory, the air gap can be made to approach zero). The size of the magnetic circuit air gap δ has a great influence on the magnetic force. The smaller the air gap, the greater the magnetic force, showing an exponential relationship. The outer mover component can perform a linear motion displacement along the Z-axis by a certain distance, and the inner mover component can perform a linear motion displacement along the Z-axis by a certain distance, and can also rotate by a certain angle along the rotation axis.

[0054] The working principle implemented by the present invention is decomposed as shown in FIGS. 14, 15, 16, 17, and 18. As shown in FIG. 14, it is the initial balanced position. At this time, the outer magnetic strips installed on the outer yoke are radially coincident with the inner magnetic strips installed on the corresponding inner mover. The force conditions of a pair of inner and outer magnetic strips in the outer mover component and the inner mover component are shown in FIG. 16. The inner magnetic strip 4 on the inner mover 3 is subjected to an outward magnetic suction force F1 from the outer magnetic strip 5 on the outer mover component. Since all the inner and outer magnetic strips are evenly distributed in the circumferential direction, the magnitudes of the magnetic suction forces received by each inner magnetic strip 4 on the inner mover 3 are equal, and the directions are uniformly emitted outward. At this time, the total magnetic suction force received by the inner mover 3 is zero, and it is in the initial balanced position. As shown in FIG. 15, it is the working state. When the outer mover component moves in the positive direction of the Z-axis, the inner mover component and the outer mover component are misaligned. The force conditions of a pair of inner and outer magnetic strips in the outer mover component and the inner mover component are shown in FIG. 17. The inner magnetic strip 4 on the inner mover 3 is subjected to an outwardly inclined magnetic suction force F2 from the outer magnetic strip 5 on the outer mover component. The radial component force of the magnetic suction force F2 is F2r and the tangential component force is F2t. Since all the inner and outer magnetic strips are evenly distributed, the magnitudes of the radial component forces F2r of the magnetic suction forces received by each inner magnetic strip 4 on the inner mover 3 are the same, and the directions are uniformly emitted outward. The magnitudes of the tangential component forces F2t of the magnetic suction forces received by each inner magnetic strip 4 are the same, and the directions are tangent to the circumferential direction in the clockwise direction. At this time, the total radial magnetic suction force received by the inner mover 3 is zero, and the total tangential magnetic suction force received forms a torque M (clockwise along the Z-axis), as Figure 18 shown. The inner mover 3 starts to rotate in the clockwise direction along the Z-axis under the action of the torque M. A linear displacement of the outer mover component corresponds to a rotation angle of the inner mover 3 and has a proportional relationship.

[0055] Embodiment 2

[0056] The assembly drawing of the present invention for the 2D proportional flow valve is as Figure 19As shown, the proportional electro-magnet 91 is fixed on the base 92. The push rod of the proportional electro-magnet 91 is fixedly connected to the left end cover 1 of the surface-mounted permanent magnet suspension coupling. The 2D proportional flow valve includes a valve core 93, a valve sleeve 94 and a plug 95. The valve core 93 of the 2D proportional flow valve is fixedly connected to the inner rotor 6 of the surface-mounted permanent magnet suspension coupling. The surface-mounted permanent magnet suspension coupling converts the linear displacement in the Z direction output by the proportional electro-magnet 91 into the rotation angle of the valve core 93 of the 2D proportional flow valve in the form of thrust converted into torque.

[0057] The specific working principle of the present invention for the 2D proportional flow valve is shown in Figure 20. 20a is the balanced state. Due to the action of the hydraulic resistance half-bridge (high-pressure oil flows into the high-pressure groove 100 through the high-pressure hole 99, reaches the low-pressure groove 97 through the sensing channel 98, and the sensing channel 98 is connected to the sensitive cavity 101), since the overlapping area of the high and low pressure grooves and the sensing channel is the same, the pressure in the sensitive cavity 101 is half of the pressure in the high-pressure cavity 96. And the force-bearing area of the valve core 93 at the sensitive cavity 101 is twice that of the high-pressure cavity 96. Coupled with the fact that the inner magnetic strip 4 and the outer magnetic strip 5 on the inner and outer rotors are in a completely overlapping state and do not output torque, the valve core is in a balanced state. Figure 20b For the rotating state, the proportional electro-magnet 91 reduces the output thrust, causing the outer rotor component to move along the negative Z-axis direction. At this time, the overlapping surface of the inner magnetic strip 4 and the outer magnetic strip 5 is misaligned, and the valve core 93 is pulled by the magnetic suction force and rotates clockwise along the positive Z-axis direction. Figure 20c For the linear motion state, since the rotation of the valve core 93 causes the overlapping area of the high and low pressure grooves and the sensing channel 98 on the valve core pilot stage to change, the pressure in the sensitive cavity 101 rises rapidly, breaking the force balance of the valve core 93. The valve core 93 moves linearly along the negative Z-axis direction under the action of the pressure difference force. Figure 20d For the reverse rotation state, since the linear motion of the valve core causes the overlapping surface of the inner magnetic strip 4 and the outer magnetic strip 5 to be misaligned again, the valve core 93 is pulled by the magnetic suction force again and rotates counterclockwise along the positive Z-axis direction until the inner magnetic strip 4 and the outer magnetic strip 5 are in a completely overlapping state. At the same time, the reverse rotation of the valve core 93 causes the pressure in the sensitive cavity 101 to decrease rapidly, and the valve core 93 returns to the position of the new force balance. Assuming that the push rod of the proportional electro-magnet 91 moves in the positive Z-axis direction, the above process is reversed. During the movement, the displacement of the valve core 93 follows the displacement of the proportional electro-magnet 91 at a ratio of 1:1. Therefore, the proportional control of the 2D proportional flow valve can be achieved.

[0058] The content described in the embodiments of this specification is only an enumeration of the implementation forms of the inventive concept. The protection scope of the present invention should not be regarded as limited to the specific forms stated in the embodiments. The protection scope of the present invention also extends to equivalent technical means that those skilled in the art can think of based on the inventive concept of the present invention.

Claims

1. A surface-mounted permanent magnet levitation spiral coupling for a 2D proportional flow valve, characterized in that: It includes an outer rotor component, and an inner rotor component is sleeved inside the outer rotor component and rotates relative to the outer rotor component and is concentrically assembled. The outer rotor component includes a left end cover (1), a linear bearing (2), an outer yoke iron component, and a right end cover (8); the outer yoke iron component includes two outer rotors (6), and the two outer rotors (6) are assembled into a cylindrical structure; the left end of the outer yoke iron component is connected to the left end cover (1), and the right end of the outer yoke iron component is connected to the right end cover (8); several outer magnetic strips (5) are provided inside the outer yoke iron component, and a first tooth (63) having the same shape as the outer magnetic strip (5) protrudes on the inner surface (64) of each outer rotor, and a space for accommodating the outer magnetic strip (5) is formed between the two first teeth (63) inside the outer yoke iron component. The first tooth (63) is used to prevent the outer magnetic strip (5) from circumferentially rotating during operation; the several outer magnetic strips (5) are tightly arranged circumferentially between the two teeth (63) inside the outer yoke iron component, and the outer magnetic strip (5) adheres to the inner surface (64) of the outer rotor by its own magnetic force; the magnetization direction of each outer magnetic strip (5) is radial, and the magnetization directions of adjacent magnetic poles are opposite; the outer magnetic strip 5 forms an angle β with the vertical plane, and the end faces of all the outer magnetic strips 5 are parallel to the vertical plane. The inner rotor component includes an inner rotor (3), an inner rotor end cover (7), and several inner magnetic strips (4) installed on the inner surface (32) of the inner rotor; two second teeth (35) having the same shape as the inner magnetic strip (4) protrude on the inner surface (32) of the inner rotor, and the two second teeth (35) are evenly distributed on the inner surface (32) of the inner rotor. A space for accommodating the inner magnetic strip (4) is formed between the two inner surfaces (32) of the inner rotor. The second tooth (35) is used to prevent the inner magnetic strip (4) from circumferentially rotating during operation; several inner magnetic strips (4) are tightly arranged circumferentially between the two second teeth (35) on the inner surface (32) of the inner rotor; the inner magnetic strip (4) adheres to the inner surface (32) of the inner rotor by magnetic force, the magnetization direction of each inner magnetic strip (4) is radial, and the magnetization directions of adjacent magnetic poles are opposite; the assembled inner magnetic strips (4) form an angle β with the vertical plane, and the end faces of all the inner magnetic strips (4) are parallel to the vertical plane; an output shaft (34) is connected to the rotation axis of the inner rotor (3), and the output shaft (34) is supported in the left end cover (1) by a linear bearing (2). The number of the outer magnetic strips (5) is the same as that of the inner magnetic strips (4). In the balanced state, the outer magnetic strips (5) installed on the outer yoke iron coincide with the inner magnetic strips (4) installed on the corresponding inner rotor in the radial direction, and the magnetization directions are the same, so as to form a closed magnetic circuit with the inner and outer magnetic strips with opposite adjacent magnetization directions. There is a magnetic circuit air gap δ between the inner and outer magnetic strips; the outer magnetic strips (5) and the inner magnetic strips (4) generate a magnetization magnetic field on the outer yoke iron component and the inner rotor; the outer rotor component can linearly move a certain distance along the rotation axis, and the inner rotor component can linearly move a certain distance along the rotation axis and can rotate a certain angle along the rotation axis.

2. The surface-mounted permanent magnet levitation spiral coupling for a 2D proportional flow valve according to claim 1, wherein: Both the left end cover (1) and the right end cover (8) are provided with shoulders that cooperate with the outer yoke iron component; both the left end cover (1) and the right end cover (8) are provided with through holes, and threaded holes are provided on both the left and right end faces of the outer rotor (6), and the outer rotor (6), the left end cover (1) and the right end cover (8) are fixed by screws.

3. The surface-mounted permanent magnet levitation spiral coupling for a 2D proportional flow valve according to claim 1, characterized in that: The outer rotor (6) and the inner rotor (3) are made of metal soft magnetic materials, while the left end cover (1), the inner rotor end cover (7) and the right end cover (8) are made of non-magnetic conductive metal materials.

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