Miniature rotary direct-drive valve

Abstract

The invention belongs to the field of fluid machinery, and discloses a miniature rotary direct-drive valve which comprises a claw pole type magnetic suspension inner rotor torque motor and a valve device, the rear end of the valve device is matched with the claw pole type magnetic suspension inner rotor torque motor in an inserted mode, and the front end of the valve device extends out of the claw pole type magnetic suspension inner rotor torque motor. The claw pole type magnetic suspension inner rotor torque motor comprises a shell assembly, a stator device and a rotor device are arranged in the shell assembly, the valve device comprises a valve sleeve fixedly inserted into the shell assembly and a valve element rotationally inserted into the valve sleeve, and the valve element is connected with the rotor device and rotates along with the rotor device. The valve sleeve is provided with an oil return port, a first valve port, an oil inlet valve port and a second valve port, and hydraulic loop structures are arranged on the valve element and the valve sleeve. The sliding of the valve core is changed into rotation through the design of the valve body structure, so that the friction force of the valve core is reduced, the efficiency is improved, meanwhile, pollutants are not easy to accumulate in the valve body to cause blockage, and the oil pollution resistance of the valve can be improved.

Description

Technical Field

[0001] The invention relates to the field of fluid machinery, in particular to a micro rotary direct-drive valve. Background Art

[0002] The rotary direct-drive valve is a commonly used hydraulic control unit in the field of hydraulic engineering. It is generally used as the core control unit of the hydraulic system due to its advantages such as high control accuracy, fast response speed and compact structure. Most of the existing rotary direct-drive valves are driven by servo motors. Due to the inductance of the motor winding, there is a continuous flow after power failure, and the motor shaft cannot return to the center in time. In addition, there is friction in the slide valve, which causes the valve core to return to the center near the middle position for a long time after power failure or cannot return to the center accurately, causing the oil window to close for a long time or unable to close completely, resulting in a large amount of oil leakage. Therefore, motor-driven valve core rotary reversing valves began to appear, but the existing valve devices of this type are large in size, low in integration, have many external pipelines, and are inconvenient to install. Summary of the invention

[0003] The object of the present invention is to provide a miniature rotary direct-drive valve to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions: A miniature rotary direct-drive valve, comprising a claw-pole magnetic suspension inner rotor torque motor and a valve device, wherein the rear end of the valve device is plugged into the claw-pole magnetic suspension inner rotor torque motor, and the front end of the valve device extends from the claw-pole magnetic suspension inner rotor torque motor, wherein the claw-pole magnetic suspension inner rotor torque motor comprises a housing assembly, wherein a stator device and a rotor device are arranged in the housing assembly, wherein the valve device comprises a valve sleeve fixedly plugged into the housing assembly and a valve core rotatably plugged into the valve sleeve, wherein the valve core is connected to the rotor device and rotates with the rotor device, wherein an oil return port, a first valve port, an oil inlet valve port, and a second valve port are arranged on the valve sleeve, and a hydraulic circuit structure is arranged on the valve core and the valve sleeve; The micro rotary direct drive valve is configured as follows: the micro rotary direct drive valve has a no output state, a first output state, and a second output state; When the micro rotary direct drive valve is in a no-output state, the hydraulic circuit structure is not conductive; When the micro rotary direct drive valve is in the first output state, the hydraulic circuit structure is turned on, and the hydraulic circuit structure makes the first valve port communicate with the oil return port, and the second valve port communicate with the oil inlet valve port; When the micro rotary direct drive valve is in the second output state, the hydraulic circuit structure is turned on, and the hydraulic circuit structure connects the second valve port with the oil return port, and the first valve port with the oil inlet valve port.

[0005] Further, a high-pressure oil chamber and a low-pressure oil chamber are formed between the valve core and the valve sleeve, the valve core has a blind hole arranged along the axial direction and a first low-pressure hole located at the front end of the blind hole, a first low-pressure groove, a first high-pressure groove, a second high-pressure groove and a second low-pressure groove are arranged on the outer wall of the valve core, and a second low-pressure hole connected to the blind hole is also arranged on the outer wall of the valve core, the first low-pressure hole and the first low-pressure groove are connected to the oil return port, the first high-pressure groove and the second high-pressure groove are both connected to the high-pressure oil chamber, and the second low-pressure groove and the second low-pressure hole are both connected to the low-pressure oil chamber; The valve core is rotated to switch the first valve port between three states: connected with the first low-pressure groove, connected with the first high-pressure groove, and not connected with both the first low-pressure groove and the first high-pressure groove. The valve core is also rotated to switch the second valve port between three states: connected with the second high-pressure groove, connected with the second low-pressure groove, and not connected with both the second high-pressure groove and the second low-pressure groove. When the micro rotary direct drive valve is in a non-output state, the first valve port is not connected to the first low-pressure groove and the first high-pressure groove, and the second valve port is not connected to the second high-pressure groove and the second low-pressure groove; When the micro rotary direct drive valve is in the first output state, the oil inlet valve port, the high-pressure oil chamber, the second high-pressure groove, and the second valve port are connected in sequence, the first valve port, the first low-pressure groove, and the oil return port are connected in sequence, the second valve port is not connected to the second low-pressure groove, and the first valve port is not connected to the first high-pressure groove; When the micro rotary direct drive valve is in the second output state, the oil inlet valve port, the high-pressure oil chamber, the first high-pressure groove, and the first valve port are connected in sequence, and the second valve port, the second low-pressure groove, the low-pressure oil chamber, the second low-pressure hole, the blind hole of the valve core, and the oil return port of the first low-pressure hole are connected in sequence, the second valve port is not connected with the second high-pressure groove, and the first valve port is not connected with the first low-pressure groove.

[0006] Furthermore, a first shoulder, a second shoulder, and a third shoulder are sequentially arranged on the outer wall of the valve core, a high-pressure oil chamber is formed between the first shoulder and the second shoulder, and a low-pressure oil chamber is formed between the second shoulder and the third shoulder; The first low-pressure groove and the first high-pressure groove are arranged on the outer wall of the first shoulder, the first low-pressure groove and the first high-pressure groove are staggered in the circumferential direction, the front end of the first low-pressure groove is connected to the oil return port, and the rear end of the first high-pressure groove is connected to the high-pressure oil chamber; The second high-pressure groove and the second low-pressure groove are arranged on the outer wall of the second shoulder, the second high-pressure groove corresponds to the first low-pressure groove in the circumferential direction, the second low-pressure groove corresponds to the first high-pressure groove in the circumferential direction, the front end of the second high-pressure groove is connected to the high-pressure oil chamber, and the rear end of the second low-pressure groove is connected to the low-pressure oil chamber.

[0007] Furthermore, the stator device includes a stator pole shoe assembly and a coil, the stator pole shoe assembly includes an upper stator pole shoe with pole shoe teeth facing downward, a lower stator pole shoe with pole shoe teeth facing upward, and a magnetic isolation ring located between the two, the number, size and shape of the pole shoe teeth on the upper stator pole shoe and the lower stator pole shoe are the same, the pole shoe teeth of the upper stator pole shoe and the pole shoe teeth of the lower stator pole shoe are staggered in the circumferential direction, the magnetic isolation ring is fixedly arranged at the closed gap between the upper stator pole shoe and the lower stator pole shoe, and the coil is sleeved on the outside of the stator pole shoe assembly.

[0008] Furthermore, the rotor device includes a rotor base and a plurality of rotor magnets, the magnetic poles of each two adjacent rotor magnets are opposite, the rotor base is rotatably sleeved on the valve sleeve, which is connected to the valve core to drive the valve core to rotate, and the plurality of rotor magnets are evenly distributed on the outer wall of the rotor base, the stator pole shoe assembly is covered on the outside of the rotor device, and a radial gap is provided between the rotor magnet and the stator pole shoe assembly.

[0009] Furthermore, a pin connector is sleeved on the valve core, and a valve sleeve through hole for accommodating the pin connector is provided on the valve sleeve. The pin connector is rotatably matched with the valve sleeve through hole, and the rotation angle range of the pin connector relative to the valve sleeve through hole is set to 6° to 10°. A pin is also radially penetrated on the valve core, and both ends of the pin pass through the pin connector, the valve sleeve and the rotor device to be connected.

[0010] Furthermore, the stator device also includes an end cover and a Hall sensor, the end cover is fixedly arranged between the valve sleeve and the stator pole shoe assembly, and the Hall sensor is arranged on the rear side of the end cover; the rotor device also includes a Hall connecting rod arranged at the rear end of the valve core and a detection magnet arranged at the rear end of the Hall connecting rod, the Hall connecting rod rotates with the valve core, the detection magnet, the Hall sensor, and the valve core shaft are coaxially arranged, and the Hall sensor is used to sense the rotation of the detection magnet.

[0011] Furthermore, the rotor magnetic steel is located in the middle of the stator upper pole shoe and the stator lower pole shoe in the axial direction.

[0012] Furthermore, the housing assembly comprises an outer shell and a connecting seat arranged at the front end of the outer shell, and the valve sleeve is fixedly inserted in the connecting seat.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1) By designing the valve body structure, the sliding of the valve core is changed into rotation, thereby reducing the friction of the valve core and improving efficiency. At the same time, pollutants are not easy to accumulate in the valve body and cause blockage, which can improve the valve's ability to resist oil pollution; 2) The torque motor is used as the driving element, and the magnetic force and tooth torque between the rotor magnet and the stator pole shoe assembly are used to fix the center position, solving the problem of large leakage caused by untimely centering; 3) An axial oil return channel is opened on the valve core to connect the low-pressure hole and the low-pressure groove, so that the servo valve body only needs one oil return hole, simplifying the external oil circuit; 4) The valve core is fixedly connected to the rotor through a pin, eliminating the intermediate transmission mechanism of the traditional servo valve, making the structure simpler and improving the overall reliability of the valve; 5) The servo mechanism of the rotary direct-drive electro-hydraulic servo valve itself has good feedback. In order to further improve the accuracy, sensors are used to collect and feedback the valve core angle displacement to form a closed-loop control. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the axial cross-section structure of the present invention.

[0015] Figure 2 It is a schematic diagram of the radial cross-section structure of the present invention.

[0016] Figure 3 It is a schematic diagram of the axial cross-section structure of the valve device in the present invention.

[0017] Figure 4 It is a schematic diagram of the local structure of the valve sleeve in the present invention.

[0018] Figure 5 This is one of the schematic diagrams of the valve core structure in the present invention.

[0019] Figure 6 This is the second schematic diagram of the valve core structure in the present invention, in which the rear part of the valve core is in a dissected state.

[0020] Figure 7 It is a schematic diagram of the cross-section principle at the first valve port B when the valve core is in the middle position in the present invention.

[0021] Figure 8 It is a schematic diagram of the cross-section principle at the second valve port A when the valve core is in the middle position in the present invention.

[0022] Fig. 9 It is a schematic diagram of the structure of the stator pole shoe assembly in the present invention.

[0023] In the figure: the first sealing ring 1, the second sealing ring 2, the third sealing ring 3, the fourth sealing ring 4, the fifth sealing ring 5, the connecting seat 6, the stator lower pole shoe 7, the sixth sealing ring 8, the coil 9, the magnetic isolation ring 10, the stator upper pole shoe 11, the seventh sealing ring 12, the end cover 13, the first bolt 14, the Hall sensor 16, the second bolt 17, the housing 18, the detection magnetic steel 19, the Hall connecting rod 20, the rotor magnetic steel 21, the rotor base 22, the pin connector 23, the pin 24, the third bolt 25, the valve sleeve 26, the valve core 27, the first shoulder 271, the second shoulder 272, the third shoulder 273, the fourth shoulder 274, the fifth shoulder 275, the second valve port A, the first valve port B, the oil inlet valve port P, the oil return port T, the first low-pressure hole a, the blind hole b, the first low-pressure groove c, the first high-pressure groove d, the second high-pressure groove e, the second low-pressure groove f, the low-pressure oil chamber g, the high-pressure oil chamber h, and the second low-pressure hole t. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] See also Figure 1-Figure 9 A miniature rotary direct-drive valve includes a claw-pole magnetic suspension inner rotor torque motor and a valve device, the rear end of the valve device is plugged into the claw-pole magnetic suspension inner rotor torque motor, and the front end of the valve device extends from the claw-pole magnetic suspension inner rotor torque motor. The claw-pole magnetic suspension inner rotor torque motor includes a housing assembly, in which a stator device and a rotor device are arranged, and the valve device includes a valve sleeve 26 fixedly inserted in the housing assembly and a valve core 27 rotatably inserted in the valve sleeve 26, the valve core 27 is connected to the rotor device and rotates with the rotor device, the valve sleeve 26 is provided with an oil return port T, a first valve port B, an oil inlet valve port P, and a second valve port A, and a hydraulic circuit structure is arranged on the valve core 27 and the valve sleeve 26. The housing assembly includes a housing 18 and a connecting seat 6 arranged at the front end of the housing 18, and the valve sleeve 26 is fixedly inserted in the connecting seat 6.

[0026] The micro rotary direct drive valve has a no-output state, a first output state, and a second output state. When the micro rotary direct drive valve is in the no-output state, the hydraulic circuit structure is not conductive. When the micro rotary direct drive valve is in the first output state, the hydraulic circuit structure is conductive, and the hydraulic circuit structure makes the first valve port B communicate with the oil return port T, and the second valve port A communicates with the oil inlet valve port P. When the micro rotary direct drive valve is in the second output state, the hydraulic circuit structure is conductive, and the hydraulic circuit structure makes the second valve port A communicate with the oil return port T, and the first valve port B communicates with the oil inlet valve port P.

[0027] Continue reading Figure 3-Figure 8 In one embodiment of the present invention, a high-pressure oil chamber h and a low-pressure oil chamber g are formed between the valve core 27 and the valve sleeve 26. The valve core 27 has a blind hole b arranged along the axial direction and a first low-pressure hole a located at the front end of the blind hole b. A first low-pressure groove c, a first high-pressure groove d, a second high-pressure groove e and a second low-pressure groove f are arranged on the outer wall of the valve core 27. A second low-pressure hole t communicating with the blind hole b is also arranged on the outer wall of the valve core 27. The first low-pressure hole a and the first low-pressure groove c are communicated with the oil return port T, the first high-pressure groove d and the second high-pressure groove e are both communicated with the high-pressure oil chamber h, and the second low-pressure groove f and the second low-pressure hole t are both communicated with the low-pressure oil chamber g. The valve core 27 rotates to switch the first valve port B among three states: connected with the first low-pressure groove c, connected with the first high-pressure groove d, and not connected with both the first low-pressure groove c and the first high-pressure groove d. The valve core 27 also rotates to switch the second valve port A among three states: connected with the second high-pressure groove e, connected with the second low-pressure groove f, and not connected with both the second high-pressure groove e and the second low-pressure groove f.

[0028] Among them, the second valve port A, the oil inlet valve port P and the first valve port B are located on the valve sleeve 26, and are equidistantly distributed in the axial direction. There are two of each type of valve ports. The same type of valve ports among the three valve ports are symmetrically distributed in the circumferential direction. The oil inlet valve port P is 90° away from the second valve port A and the first valve port B in the circumferential direction. The second valve port A, the first valve port B, the oil inlet valve port P, the oil return port T, the first low-pressure hole a, the blind hole b, the first low-pressure groove c, the first high-pressure groove d, the second high-pressure groove e, the second low-pressure groove f, the low-pressure oil chamber g, the high-pressure oil chamber h, and the second low-pressure hole t constitute a hydraulic circuit structure.

[0029] When the micro rotary direct drive valve is in a no-output state, the first valve port B is not connected to the first low-pressure groove c and the first high-pressure groove d, and the second valve port A is not connected to the second high-pressure groove e and the second low-pressure groove f.

[0030] When the micro rotary direct drive valve is in the first output state, the oil inlet valve port P, the high-pressure oil chamber h, the second high-pressure groove e, and the second valve port A are connected in sequence, the first valve port B, the first low-pressure groove c, and the oil return port T are connected in sequence, the second valve port A is not connected with the second low-pressure groove f, and the first valve port B is not connected with the first high-pressure groove d.

[0031] When the micro rotary direct drive valve is in the second output state, the oil inlet valve port P, the high-pressure oil chamber h, the first high-pressure groove d, and the first valve port B are connected in sequence, the second valve port A, the second low-pressure groove f, the low-pressure oil chamber g, the second low-pressure hole t, the blind hole b of the valve core 27, and the oil return port T of the first low-pressure hole a are connected in sequence, the second valve port A is not connected with the second high-pressure groove e, and the first valve port B is not connected with the first low-pressure groove c.

[0032] Continue reading Figure 5In one embodiment of the present invention, the first shoulder 271, the second shoulder 272, the third shoulder 273, the fourth shoulder 274, and the fifth shoulder 275 are sequentially arranged on the outer wall of the valve core 27, and a high-pressure oil chamber h is formed between the first shoulder 271 and the second shoulder 272, and a low-pressure oil chamber g is formed between the second shoulder 272 and the third shoulder 273. The first low-pressure groove c and the first high-pressure groove d are arranged on the outer wall of the first shoulder 271, and the first low-pressure groove c and the first high-pressure groove d are staggered in the circumferential direction. The front end of the first low-pressure groove c is connected to the oil return port T, and the rear end of the first high-pressure groove d is connected to the high-pressure oil chamber h. The second high-pressure groove e and the second low-pressure groove f are arranged on the outer wall of the second shoulder 272, and the second high-pressure groove e corresponds to the first low-pressure groove c in the circumferential direction, and the second low-pressure groove f corresponds to the first high-pressure groove d in the circumferential direction. The front end of the second high-pressure groove e is connected to the high-pressure oil chamber h, and the rear end of the second low-pressure groove f is connected to the low-pressure oil chamber g. The first shoulder 271 and the second shoulder 272 are located at the first valve port B and the second valve port A, respectively. The third shoulder 273 has a similar function to the concentric ring. The fourth shoulder 274 is used to cooperate with the pin connector 23. The fifth shoulder 275 has a similar function to the concentric ring and has the same outer diameter as the Hall connecting rod 20. Each shoulder is tightly matched in the valve sleeve 26 to be rotatable.

[0033] Continue reading Figure 1 In one embodiment of the present invention, the stator device includes an end cover 13, a stator pole shoe assembly, a coil 9, and a Hall sensor 16. The end cover 13 is fixedly arranged between the valve sleeve 26 and the stator pole shoe assembly, the end cover 13 and the stator pole shoe assembly are coaxially arranged, and the outer diameter of the end cover 13 is interference fit with the inner diameter of the stator pole shoe assembly; the Hall sensor 16 is arranged on the rear side of the end cover 13. The coil 9 is sleeved on the stator pole shoe assembly.

[0034] Continue reading Fig. 9 In one embodiment of the present invention, the claw pole 6 includes an upper stator pole shoe 11 with claw pole teeth facing downward, a lower stator pole shoe 7 with claw pole teeth facing upward, and a magnetic isolation ring 10 located between the two; the upper stator pole shoe 11 and the lower stator pole shoe 7 have the same number, size and shape, the axial cross-section of the claw pole teeth is an isosceles trapezoid, a rectangle or other combined curves, and tooth slots are formed between adjacent claw pole teeth. The claw pole teeth of the upper stator pole shoe 11 and the claw pole teeth of the lower stator pole shoe 7 are staggered in the circumferential direction, and a magnetic isolation ring 10 is provided at the closed gap between the upper stator pole shoe 11 and the lower stator pole shoe 7. The magnetic isolation ring 10 is connected to the claw pole 6 by welding, and the claw pole teeth of the upper stator pole shoe 11 and the claw pole teeth of the lower stator pole shoe 7 are engaged with each other through the magnetic isolation ring 10; the coil 9 is made of copper, and the coil 9 is wound between the upper stator pole shoe 11 and the lower stator pole shoe 7.

[0035] Continue reading Figure 1In one embodiment of the present invention, the rotor device includes a plurality of rotor magnets 21, a rotor base 22, a detection magnet 19, and a Hall connecting rod 20. The rotor base 22 is rotatably sleeved on the valve sleeve 26, which is connected to the valve core 27 to drive the valve core 27 to rotate. The rotor magnet 21 is arranged between the stator pole shoe assembly and the rotor base 22. The rotor magnet 21 is evenly distributed on the outer wall of the rotor base 22, and the magnetic poles of each adjacent two rotor magnets 21 are opposite. The rotor magnet 21 is fixedly connected to the rotor base 22, and a certain gap is provided between the top surface of the rotor magnet 21 and the bottom surface of the stator pole shoe assembly. The rotor magnet 21 is located in the middle of the stator upper pole shoe 11 and the stator lower pole shoe 7 in the axial direction.

[0036] The housing 18, the stator upper pole shoe 11, the stator lower pole shoe 7 and the rotor base 22 are all made of ferromagnetic materials with high magnetic permeability; the end cover 13 and the magnetic isolation ring 10 are made of non-magnetic materials.

[0037] Continue reading Figure 2 In one embodiment of the present invention, a pin connector 23 is sleeved on the valve core 27, and the pin connector 23 is arranged in a radial direction. A valve sleeve through hole for accommodating the pin connector 23 is provided on the valve sleeve 26, and the valve sleeve through hole is also arranged in a radial direction. The pin connector 23 is rotatably matched with the valve sleeve through hole, and the rotation angle range of the pin connector 23 relative to the valve sleeve through hole is limited to 6° to 10°. A pin 24 is also radially penetrated on the valve core 27, and the pin 24 is arranged in a radial direction, and its two ends pass through the pin connector 23 and the valve sleeve 26 to connect with the rotor device. When the valve core 27 is working, it swings back and forth at a small angle.

[0038] The present invention utilizes the restoring force and tooth slot torque between the stator and the rotor to suspend the rotor in the middle position in the axial and circumferential directions. The working principle can be found in patent CN115313914A.

[0039] During operation, the present invention supplies oil to the oil cylinder in both directions. The first valve port B is connected with the retraction oil chamber of the oil cylinder through a pipeline (oil entering the retraction oil chamber pushes the piston rod to retract), and the second valve port A is connected with the extension oil chamber of the oil cylinder through a pipeline (oil entering the extension oil chamber pushes the piston rod to extend). The oil inlet valve port P is connected with the system oil source, and the oil return port T is connected with the system oil return port.

[0040] The present invention is a three-position four-way valve, and its working principle is as follows: In the initial state, the controller is not powered, the claw-pole magnetic suspension inner rotor torque motor does not provide a rotation signal, the second low-pressure groove f, the low-pressure oil chamber g, the second low-pressure hole t, the blind hole b of the valve core 27, and the first low-pressure hole a of the valve body are connected in sequence, and the first low-pressure hole a and the first low-pressure groove c are connected to the system oil return port through the oil return port T. The first high-pressure groove d is connected to the second high-pressure groove e and the high-pressure oil chamber h, and the high-pressure oil chamber h is connected to the system oil source through the oil inlet valve port P. When working, the high-pressure oil chamber h is always the system pressure. The valve core 27 maintains a static pressure balance state, the second valve port A is not connected to the second high-pressure groove e and the second low-pressure groove f, and the first valve port A is not connected to the first low-pressure groove c and the first high-pressure groove d. At this time, the micro rotary direct drive valve is in a non-output state.

[0041] When the claw-pole magnetic suspension inner rotor torque motor provides a counterclockwise ( Figure 1 The rotor device drives the valve core 27 to rotate counterclockwise according to the rotation signal of the valve core 27 (looking from left to right). The first valve port B is connected to the first low-pressure groove c, and the second valve port A is connected to the second high-pressure groove e. At this time, the oil in the rotary direct-drive electro-hydraulic servo valve will enter the high-pressure oil chamber h from the oil inlet valve port P, and flow out from the second valve port A through the second high-pressure groove e (the first high-pressure chamber d is not connected to the first valve port B at this time, so the oil flowing to the first high-pressure chamber d does not work), flow to the extension oil chamber of the oil cylinder, and then the oil in the retraction oil chamber of the oil cylinder flows back to the first valve port B, and flows from the first valve port B into the flow hydraulic circuit that flows out from the return oil port T through the first low-pressure groove c. At the same time, the Hall sensor 16 will collect the angular displacement of the detection magnet 19 driven by the rotation of the valve core 27, and transmit the displacement to the controller through an electrical signal to realize the closed-loop control of the displacement of the valve core 27. At this time, the micro rotary direct-drive valve is in the first output state.

[0042] On the contrary, when the valve core 27 rotates clockwise, the oil in the rotary direct-drive electro-hydraulic servo valve will form an oil flow from the oil inlet valve port P into the high-pressure oil chamber h, and flow from the first valve port B to the retraction oil chamber of the cylinder through the first high-pressure groove d (the second high-pressure groove e is not connected to the first valve port A at this time, so the oil flowing to the second high-pressure groove e has no effect), and then the oil in the extension oil chamber of the cylinder enters the second valve port A, flows from the second valve port A into the second low-pressure groove f, and then flows from the second low-pressure port t into the blind hole b of the valve core 27 to the first low-pressure port a, and finally flows out from the return oil port T. A flow hydraulic circuit, at this time, the micro rotary direct-drive valve is in the second output state.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A miniature rotary direct-drive valve, comprising a claw-pole magnetic suspension inner rotor torque motor and a valve device, wherein the rear end of the valve device is plugged into the claw-pole magnetic suspension inner rotor torque motor, and the front end of the valve device extends from the claw-pole magnetic suspension inner rotor torque motor, wherein the claw-pole magnetic suspension inner rotor torque motor comprises a housing assembly, wherein a stator device and a rotor device are arranged in the housing assembly, and wherein: The valve device comprises a valve sleeve (26) fixedly inserted in the housing assembly and a valve core (27) rotatably inserted in the valve sleeve (26); the valve core (27) is connected to the rotor device and rotates with the rotor device; the valve sleeve (26) is provided with an oil return port (T), a first valve port (B), an oil inlet valve port (P), and a second valve port (A); and a hydraulic circuit structure is provided on the valve core (27) and the valve sleeve (26); The micro rotary direct drive valve is configured as follows: the micro rotary direct drive valve has a no output state, a first output state, and a second output state; When the micro rotary direct drive valve is in a no-output state, the hydraulic circuit structure is not conductive; When the micro rotary direct drive valve is in the first output state, the hydraulic circuit structure is turned on, and the hydraulic circuit structure makes the first valve port (B) communicate with the oil return port (T), and the second valve port (A) communicate with the oil inlet valve port (P); When the micro rotary direct drive valve is in the second output state, the hydraulic circuit structure is turned on, and the hydraulic circuit structure connects the second valve port (A) with the oil return port (T), and the first valve port (B) with the oil inlet valve port (P).

2. A micro rotary direct drive valve according to claim 1, characterized in that: A high-pressure oil chamber (h) and a low-pressure oil chamber (g) are formed between the valve core (27) and the valve sleeve (26); the valve core (27) has a blind hole (b) arranged along the axial direction and a first low-pressure hole (a) located at the front end of the blind hole (b); a first low-pressure groove (c), a first high-pressure groove (d), a second high-pressure groove (e) and a second low-pressure groove (f) are arranged on the outer wall of the valve core (27); a second low-pressure hole (t) communicating with the blind hole (b) is also arranged on the outer wall of the valve core (27); the first low-pressure hole (a) and the first low-pressure groove (c) are communicated with the oil return port (T); the first high-pressure groove (d) and the second high-pressure groove (e) are both communicated with the high-pressure oil chamber (h); the second low-pressure groove (f) and the second low-pressure hole (t) are both communicated with the low-pressure oil chamber (g); The valve core (27) is rotated to switch the first valve port (B) between three states: being connected to the first low-pressure groove (c), being connected to the first high-pressure groove (d), and being disconnected from both the first low-pressure groove (c) and the first high-pressure groove (d). The valve core (27) is also rotated to switch the second valve port (A) between three states: being connected to the second high-pressure groove (e), being connected to the second low-pressure groove (f), and being disconnected from both the second high-pressure groove (e) and the second low-pressure groove (f). When the micro rotary direct drive valve is in a non-output state, the first valve port (B) is not connected to the first low-pressure groove (c) and the first high-pressure groove (d), and the second valve port (A) is not connected to the second high-pressure groove (e) and the second low-pressure groove (f); When the micro rotary direct drive valve is in the first output state, the oil inlet valve port (P), the high-pressure oil chamber (h), the second high-pressure groove (e), and the second valve port (A) are connected in sequence, the first valve port (B), the first low-pressure groove (c), and the oil return port (T) are connected in sequence, the second valve port (A) is not connected to the second low-pressure groove (f), and the first valve port (B) is not connected to the first high-pressure groove (d); When the micro rotary direct drive valve is in the second output state, the oil inlet valve port (P), the high-pressure oil chamber (h), the first high-pressure groove (d), and the first valve port (B) are connected in sequence, the second valve port (A), the second low-pressure groove (f), the low-pressure oil chamber (g), the second low-pressure hole (t), the blind hole (b) of the valve core (27), and the oil return port (T) of the first low-pressure hole (a) are connected in sequence, the second valve port (A) is not connected to the second high-pressure groove (e), and the first valve port (B) is not connected to the first low-pressure groove (c).

3. A micro rotary direct drive valve according to claim 2, characterized in that: A first shoulder (271), a second shoulder (272), and a third shoulder (273) are sequentially arranged on the outer wall of the valve core (27); a high-pressure oil chamber (h) is formed between the first shoulder (271) and the second shoulder (272); and a low-pressure oil chamber (g) is formed between the second shoulder (272) and the third shoulder (273); The first low-pressure groove (c) and the first high-pressure groove (d) are arranged on the outer wall of the first shoulder (271), the first low-pressure groove (c) and the first high-pressure groove (d) are staggered in the circumferential direction, the front end of the first low-pressure groove (c) is connected to the oil return port (T), and the rear end of the first high-pressure groove (d) is connected to the high-pressure oil chamber (h); The second high-pressure groove (e) and the second low-pressure groove (f) are arranged on the outer wall of the second shoulder (272), the second high-pressure groove (e) corresponds to the first low-pressure groove (c) in the circumferential direction, the second low-pressure groove (f) corresponds to the first high-pressure groove (d) in the circumferential direction, the front end of the second high-pressure groove (e) is connected to the high-pressure oil chamber (h), and the rear end of the second low-pressure groove (f) is connected to the low-pressure oil chamber (g).

4. A micro rotary direct drive valve according to claim 1, characterized in that: The stator device comprises a stator pole shoe assembly and a coil (9), wherein the stator pole shoe assembly comprises an upper stator pole shoe (11) with pole shoe teeth facing downward, a lower stator pole shoe (7) with pole shoe teeth facing upward, and a magnetic isolation ring (10) located between the two, the number, size and shape of the pole shoe teeth on the upper stator pole shoe (11) and the lower stator pole shoe (7) being the same, the pole shoe teeth on the upper stator pole shoe (11) and the pole shoe teeth on the lower stator pole shoe (7) being staggered in the circumferential direction, the magnetic isolation ring (10) being fixedly arranged at the closing gap between the upper stator pole shoe (11) and the lower stator pole shoe (7), and the coil (9) being sleeved on the outside of the stator pole shoe assembly.

5. A micro rotary direct drive valve according to claim 4, characterized in that: The rotor device comprises a rotor base (22) and a plurality of rotor magnets (21), wherein the magnetic poles of two adjacent rotor magnets (21) are opposite to each other, the rotor base (22) is rotatably sleeved on a valve sleeve (26), connected to a valve core (27), and drives the valve core (27) to rotate, the plurality of rotor magnets (21) are evenly distributed on an outer wall of the rotor base (22), the stator pole shoe assembly is covered on the outside of the rotor device, and a radial gap is provided between the rotor magnets (21) and the stator pole shoe assembly.

6. A micro rotary direct drive valve according to claim 5, characterized in that: The valve core (27) is sleeved with a pin connector (23); the valve sleeve (26) is provided with a valve sleeve through hole for accommodating the pin connector (23); the pin connector (23) is rotatably matched with the valve sleeve through hole; the rotation angle range of the pin connector (23) relative to the valve sleeve through hole is set to 6° to 10°; the valve core (27) is further radially penetrated with a pin (24); two ends of the pin (24) pass through the pin connector (23) and the valve sleeve (26) to be connected with the rotor device.

7. A micro rotary direct drive valve according to claim 4, characterized in that: The stator device further comprises an end cover (13) and a Hall sensor (16), wherein the end cover (13) is fixedly arranged between the valve sleeve (26) and the stator pole shoe assembly, and the Hall sensor (16) is arranged at the rear side of the end cover (13); the rotor device further comprises a Hall connecting rod (20) arranged at the rear end of the valve core (27) and a detection magnet (19) arranged at the rear end of the Hall connecting rod (20), wherein the Hall connecting rod (20) rotates together with the valve core (27), the detection magnet (19), the Hall sensor (16) and the valve core (27) are arranged coaxially, and the Hall sensor (16) is used to sense the rotation of the detection magnet (19).

8. A micro rotary direct drive valve according to claim 4, characterized in that: The rotor magnetic steel (21) is located in the middle of the stator upper pole shoe (11) and the stator lower pole shoe (7) in the axial direction.

9. The micro rotary direct drive valve according to claim 1, characterized in that: The housing assembly comprises an outer shell (18) and a connecting seat (6) arranged at the front end of the outer shell (18), and the valve sleeve (26) is fixedly inserted in the connecting seat (6).

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