A micro rotary direct drive valve

Abstract

The present invention belongs to the field of fluid machinery and discloses a miniature rotary direct-drive valve comprising a claw-pole magnetic levitation inner rotor torque motor and a valve device. The rear end of the valve device is plugged into the claw-pole magnetic levitation inner rotor torque motor, and the front end of the valve device extends from the claw-pole magnetic levitation inner rotor torque motor. The claw-pole magnetic levitation inner rotor torque motor comprises a housing assembly, in which a stator assembly and a rotor assembly are disposed. The valve device comprises a valve sleeve fixedly plugged into the housing assembly and a valve core rotatably plugged into the valve sleeve. The valve core is connected to the rotor assembly and rotates with the rotor assembly. The valve sleeve is provided with an oil return port, a first valve port, an oil inlet valve port, and a second valve port. A hydraulic circuit structure is provided on the valve core and the valve sleeve. The present invention, through the design of the valve body structure, converts the sliding of the valve core into rotation, thereby reducing the friction of the valve core and improving efficiency. Contaminants are also less likely to accumulate in the valve body and cause clogging, thereby improving the valve's resistance to oil contamination.

Description

Technical Field

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

[0002] Rotary direct-drive valves are commonly used hydraulic control units in hydraulic engineering. Due to their high control precision, fast response speed, and compact structure, they are widely used as the core control unit of hydraulic systems. Currently, most rotary direct-drive valves are driven by servo motors. Due to the inductance of the motor windings, there is a continuous flow after power failure, which prevents the motor shaft from returning to center in time. Furthermore, friction in the sliding valve causes the valve core to take a long time to return to center near the neutral position after power failure, or it cannot return to center accurately. This causes the oil flow window to close for a long time or not be completely closed, resulting in large oil leakage. Therefore, motor-driven spool rotary reversing valves have begun to appear. However, these valve devices are currently large, have low integration, and require a large number of external pipelines, making installation inconvenient. 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 background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A miniature rotary direct-drive valve includes a claw-pole magnetic levitation inner rotor torque motor and a valve device. The rear end of the valve device is plugged into the claw-pole magnetic levitation inner rotor torque motor, and the front end of the valve device extends from the claw-pole magnetic levitation inner rotor torque motor. The claw-pole magnetic levitation inner rotor torque motor includes a housing assembly, in which a stator assembly and a rotor assembly are disposed. The valve device includes a valve sleeve fixedly plugged into the housing assembly and a valve core rotatably plugged into the valve sleeve. The valve core is connected to the rotor assembly and rotates with the rotor assembly. The valve sleeve is provided with an oil return port, a first valve port, an oil inlet valve port, and a second valve port. A hydraulic circuit structure is provided on the valve core and the valve sleeve.

[0006] 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;

[0007] When the micro rotary direct drive valve is in a no-output state, the hydraulic circuit structure is not conductive;

[0008] 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 connects the first valve port with the oil return port, and the second valve port with the oil inlet valve port;

[0009] When the micro rotary direct drive valve is in the second output state, the hydraulic circuit structure is connected, 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.

[0010] Furthermore, 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 in 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 communicating with 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 communicated with the oil return port, the first high-pressure groove and the second high-pressure groove are both communicated with the high-pressure oil chamber, and the second low-pressure groove and the second low-pressure hole are both communicated with the low-pressure oil chamber;

[0011] The valve core rotates to switch the first valve port between three states: communicating with the first low-pressure groove, communicating with the first high-pressure groove, and not communicating with both the first low-pressure groove and the first high-pressure groove. The valve core also rotates to switch the second valve port between three states: communicating with the second high-pressure groove, communicating with the second low-pressure groove, and not communicating with both the second high-pressure groove and the second low-pressure groove.

[0012] When the micro rotary direct drive valve is in a no-output state, the first valve port is not connected to the first low-pressure tank and the first high-pressure tank, and the second valve port is not connected to the second high-pressure tank and the second low-pressure tank;

[0013] 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 tank, and the second valve port are connected in sequence, the first valve port, the first low-pressure tank, and the oil return port are connected in sequence, the second valve port is not connected to the second low-pressure tank, and the first valve port is not connected to the first high-pressure tank;

[0014] 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 first low-pressure hole oil return port are connected in sequence. The second valve port is not connected to the second high-pressure groove, and the first valve port is not connected to the first low-pressure groove.

[0015] Furthermore, a first shoulder, a second shoulder, and a third shoulder are sequentially provided 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;

[0016] The first low-pressure groove and the first high-pressure groove are arranged on the outer wall of the first shoulder, and 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.

[0017] 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, and 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.

[0018] 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.

[0019] Furthermore, the rotor device includes a rotor base and multiple 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 multiple 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 there is a radial gap between the rotor magnet and the stator pole shoe assembly.

[0020] 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.

[0021] 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.

[0022] Furthermore, the rotor magnet is located in the middle of the stator upper pole shoe and the stator lower pole shoe in the axial direction.

[0023] Furthermore, the housing assembly includes an outer shell and a connecting seat arranged at the front end of the outer shell, and the valve sleeve is fixedly inserted into the connecting seat.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1) The design of the valve body structure changes the sliding of the valve core into rotation, thereby reducing the friction of the valve core and improving efficiency. At the same time, pollutants are not easily accumulated in the valve body to cause blockage, which can improve the valve's ability to resist oil pollution;

[0026] 2) Using a torque motor as the driving element, the magnetic force and cogging 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;

[0027] 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;

[0028] 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;

[0029] 5) The servo mechanism of the rotary direct-drive electro-hydraulic servo valve itself has good feedback. In order to further improve the accuracy, a sensor is used to collect and feedback the valve core angle displacement to form a closed-loop control. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the axial cross-section structure of the present invention.

[0031] Figure 2 It is a schematic diagram of the radial cross-section structure of the present invention.

[0032] Figure 3 It is a schematic diagram of the axial cross-sectional structure of the valve device in the present invention.

[0033] Figure 4 It is a schematic diagram of the local structure of the valve sleeve in the present invention.

[0034] Figure 5 This is one of the schematic diagrams of the valve core structure in the present invention.

[0035] 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.

[0036] 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.

[0037] Figure 8 This 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.

[0038] Figure 9 This is a schematic structural diagram of the stator pole shoe assembly in the present invention.

[0039] In the figure: first sealing ring 1, second sealing ring 2, third sealing ring 3, fourth sealing ring 4, fifth sealing ring 5, connecting seat 6, stator lower pole shoe 7, sixth sealing ring 8, coil 9, magnetic isolation ring 10, stator upper pole shoe 11, seventh sealing ring 12, end cover 13, first bolt 14, Hall sensor 16, second bolt 17, housing 18, detection magnet 19, Hall connecting rod 20, rotor magnet 21, rotor base 22, pin connector 23, pin 24, third bolt 25, valve sleeve 26, valve core 27, first shoulder 271, second shoulder 272, third shoulder 273, fourth shoulder 274, fifth shoulder 275, second valve port A, first valve port B, oil inlet valve port P, oil return port T, first low-pressure hole a, blind hole b, first low-pressure groove c, first high-pressure groove d, second high-pressure groove e, second low-pressure groove f, low-pressure oil chamber g, high-pressure oil chamber h, second low-pressure hole t. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0041] See also Figures 1-9 A miniature rotary direct-drive valve comprises a claw-pole magnetic levitation inner rotor torque motor and a valve assembly. The rear end of the valve assembly is pluggable with the claw-pole magnetic levitation inner rotor torque motor, and the front end of the valve assembly extends from the claw-pole magnetic levitation inner rotor torque motor. The claw-pole magnetic levitation inner rotor torque motor comprises a housing assembly, in which a stator assembly and a rotor assembly are disposed. The valve assembly comprises a valve sleeve 26 fixedly inserted into the housing assembly and a valve core 27 rotatably inserted into the valve sleeve 26. The valve core 27 is connected to the rotor assembly and rotates with the rotor assembly. 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. A hydraulic circuit structure is provided on the valve core 27 and the valve sleeve 26. The housing assembly comprises an outer shell 18 and a connecting seat 6 disposed at the front end of the outer shell 18. The valve sleeve 26 is fixedly inserted into the connecting seat 6.

[0042] The miniature rotary direct-drive valve has a zero-output state, a first output state, and a second output state. When the miniature rotary direct-drive valve is in the zero-output state, the hydraulic circuit structure is closed. When the miniature rotary direct-drive valve is in the first output state, the hydraulic circuit structure is open, connecting the first valve port B with the oil return port T and the second valve port A with the oil inlet valve port P. When the miniature rotary direct-drive valve is in the second output state, the hydraulic circuit structure is open, connecting the second valve port A with the oil return port T and the first valve port B with the oil inlet valve port P.

[0043] 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 in 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 provided on the outer wall of the valve core 27. A second low-pressure hole t communicating with the blind hole b is also provided 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.

[0044] The three valve ports, namely, 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 equally spaced in the axial direction. There are two of each type of valve port. These three valve ports are symmetrically distributed in the circumferential direction, with the oil inlet valve port P being 90° circumferentially spaced from the second valve port A and the first valve port B. 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 port 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 port t form a hydraulic circuit structure.

[0045] 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.

[0046] 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.

[0047] 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, and 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.

[0048] Continue reading Figure 5In one embodiment of the present invention, the outer wall of the valve core 27 is provided with a first land 271, a second land 272, a third land 273, a fourth land 274, and a fifth land 275 in a forward and backward sequence. A high-pressure oil chamber h is formed between the first and second lands 271 and a low-pressure oil chamber g is formed between the second and third lands 272 and 273. A first low-pressure groove c and a first high-pressure groove d are provided on the outer wall of the first land 271, staggered circumferentially. The front end of the first low-pressure groove c communicates with the oil return port T, while the rear end of the first high-pressure groove d communicates with the high-pressure oil chamber h. Second high-pressure grooves e and f are provided on the outer wall of the second land 272, circumferentially corresponding to the first low-pressure groove c and the first low-pressure groove f. The front end of the second high-pressure groove e communicates with the high-pressure oil chamber h, while the rear end of the second low-pressure groove f communicates with the low-pressure oil chamber g. The first and second lands 271 and 272 are located at the first and second valve ports B and A, respectively. The third land 273 functions similarly to the concentric rings. The fourth land 274 is used to mate with the pin connector 23. The fifth land 275 functions similarly to the concentric rings and has the same outer diameter as the Hall effect rod 20. Each land rotatably fits tightly within the valve sleeve 26.

[0049] Continue reading Figure 1 In one embodiment of the present invention, the stator assembly includes an end cap 13, a stator pole shoe assembly, a coil 9, and a Hall effect sensor 16. The end cap 13 is fixedly mounted between the valve housing 26 and the stator pole shoe assembly. The end cap 13 and the stator pole shoe assembly are coaxially arranged, and the outer diameter of the end cap 13 forms an interference fit with the inner diameter of the stator pole shoe assembly. The Hall effect sensor 16 is mounted on the rear side of the end cap 13. The coil 9 is sleeved on the stator pole shoe assembly.

[0050] Continue reading Figure 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. 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. A magnetic isolation ring 10 is provided in 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. 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 via the magnetic isolation ring 10. The coil 9 is made of copper and is wound between the upper stator pole shoe 11 and the lower stator pole shoe 7.

[0051] Continue reading Figure 1In one embodiment of the present invention, the rotor assembly includes multiple rotor magnets 21, a rotor base 22, a detection magnet 19, and a Hall effect connecting rod 20. The rotor base 22 is rotatably mounted on a valve sleeve 26 and connected to a valve core 27, driving the valve core 27 to rotate. The rotor magnets 21 are positioned between the stator pole shoe assembly and the rotor base 22. The rotor magnets 21 are evenly distributed around the outer wall of the rotor base 22, with adjacent rotor magnets 21 having opposite magnetic poles. The rotor magnets 21 are fixedly connected to the rotor base 22, with a gap provided between the top surface of the rotor magnets 21 and the bottom surface of the stator pole shoe assembly. The rotor magnets 21 are axially located directly between the upper stator pole shoe 11 and the lower stator pole shoe 7.

[0052] 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.

[0053] Continue reading Figure 2 In one embodiment of the present invention, a radially disposed pin connector 23 is sleeved on a valve core 27. A radially disposed valve sleeve 26 defines a valve sleeve through-hole for receiving the pin connector 23. The valve sleeve through-hole is also radially disposed. The pin connector 23 rotatably engages the valve sleeve through-hole, and the rotational angle of the pin connector 23 relative to the valve sleeve through-hole is limited to 6° to 10°. A radially disposed pin 24 is also provided through the valve core 27. Pin 24 extends radially, with both ends extending through the pin connector 23 and valve sleeve 26 to connect to the rotor assembly. During operation, the valve core 27 oscillates back and forth at a small angle.

[0054] The present invention utilizes the restoring force and cogging 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.

[0055] During operation, the present invention supplies oil to the oil cylinder in both directions. The first valve port B is connected to 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 to 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 to the system oil source, and the oil return port T is connected to the system oil return port.

[0056] The present invention is a three-position four-way valve, and its working principle is as follows:

[0057] In the initial state, the controller is de-energized, and the claw-pole magnetic levitation inner rotor torque motor provides no rotation signal. The second low-pressure groove f, low-pressure oil chamber g, second low-pressure port t, blind hole b of valve core 27, and first low-pressure port a of the valve body are sequentially connected. The first low-pressure port a and first low-pressure groove c are connected to the system oil return port via oil return port T. The first high-pressure groove d, second high-pressure groove e, and high-pressure oil chamber h are connected. High-pressure oil chamber h is connected to the system oil source via oil inlet valve port P. During operation, high-pressure oil chamber h maintains constant system pressure. Valve core 27 maintains a static pressure equilibrium state. The second valve port A is disconnected from both the second high-pressure groove e and the second low-pressure groove f, and the first valve port A is disconnected from both the first low-pressure groove c and the first high-pressure groove d. At this point, the micro rotary direct-drive valve is in a non-output state.

[0058] When the claw-pole magnetic levitation inner rotor torque motor provides a counterclockwise ( Figure 1 In response to a rotation signal (seen from left to right), the rotor assembly drives valve core 27 to rotate counterclockwise, connecting first valve port B with the first low-pressure groove c and second valve port A with the second high-pressure groove e. This forms a hydraulic circuit in which oil in the rotary direct-drive electro-hydraulic servo valve enters the high-pressure oil chamber h from inlet valve port P, flows out of second valve port A through the second high-pressure groove e (the first high-pressure chamber d is not connected to first valve port B at this time, so oil flowing into the first high-pressure chamber d has no effect), flows into the extension oil chamber of the cylinder, and then flows back to first valve port B, from which it flows into the return port T through the first low-pressure groove c. Simultaneously, Hall effect sensor 16 detects the angular displacement of detection magnet 19 caused by the rotation of valve core 27 and transmits this displacement to the controller via an electrical signal, implementing closed-loop control of valve core 27 displacement. At this point, the micro rotary direct-drive valve is in its first output state.

[0059] On the contrary, when the valve core 27 rotates clockwise, the oil in the rotary direct-drive electro-hydraulic servo valve will be formed. At this time, the oil will enter the high-pressure oil chamber h from the oil inlet valve port P, 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 with 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 through the second low-pressure groove f, and then flows from the second low-pressure port t through 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. The flow hydraulic circuit, at this time, the micro rotary direct-drive valve is in the second output state.

[0060] While 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 these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A miniature rotary direct-drive valve comprising a claw-pole magnetic levitation inner rotor torque motor and a valve assembly, wherein the rear end of the valve assembly is pluggable with the claw-pole magnetic levitation inner rotor torque motor, and the front end of the valve assembly extends from the claw-pole magnetic levitation inner rotor torque motor. The claw-pole magnetic levitation inner rotor torque motor comprises a housing assembly, wherein a stator assembly and a rotor assembly are disposed. The valve assembly is characterized in that: 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) being connected to the rotor device and rotating with the rotor device, the valve sleeve (26) being provided with an oil return port (T), a first valve port (B), an oil inlet valve port (P), and a second valve port (A), the valve core (27) and the valve sleeve (26) being provided with a hydraulic circuit structure, a high-pressure oil chamber (h) and a low-pressure oil chamber (g) being formed between the valve core (27) and the valve sleeve (26), the valve core (27) being provided with a blind hole (b) arranged in 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) being provided on the outer wall of the valve core (27), A second low-pressure hole (t) communicating with the blind hole (b) is also provided on the outer wall, 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: communicating with the first low-pressure groove (c), communicating with the first high-pressure groove (d), and not communicating with both the first low-pressure groove (c) and the first high-pressure groove (d), and the valve core (27) is also rotated to switch the second valve port (A) between three states: communicating with the second high-pressure groove (e), communicating with the second low-pressure groove (f), and not communicating with both the second high-pressure groove (e) and the second low-pressure groove (f); 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 non-output state, the hydraulic circuit structure is disconnected, wherein the first valve port (B) is disconnected from both the first low-pressure groove (c) and the first high-pressure groove (d), and the second valve port (A) is 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 the first output state, the hydraulic circuit structure is connected, and the hydraulic circuit structure connects the first valve port (B) with the return oil port (T), and the second valve port (A) with the inlet valve port (P). The 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, and the first valve port (B), the first low-pressure groove (c), and the return oil 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). 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 return oil port (T), and the first valve port (B) with the inlet valve port (P), wherein the 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, and 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 return oil 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).

2. A micro rotary direct drive valve according to claim 1, 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).

3. The 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 upper stator pole shoe (11) and the lower stator pole shoe (7), wherein the pole shoe teeth on the upper stator pole shoe (11) and the lower stator pole shoe (7) are the same in number, size, and shape, and the pole shoe teeth on the upper stator pole shoe (11) and the pole shoe teeth on the lower stator pole shoe (7) are staggered in the circumferential direction. The magnetic isolation ring (10) is fixedly arranged at the closing gap between the upper stator pole shoe (11) and the lower stator pole shoe (7), and the coil (9) is sleeved on the outside of the stator pole shoe assembly.

4. A micro rotary direct drive valve according to claim 3, 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, and 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, and the plurality of rotor magnets (21) are evenly distributed on the outer wall of the rotor base (22), and the stator pole shoe assembly is covered on the outside of the rotor device, and a radial gap is formed between the rotor magnet (21) and the stator pole shoe assembly.

5. A micro rotary direct drive valve according to claim 4, characterized in that: A pin connector (23) is sleeved on the valve core (27), and a valve sleeve through hole for accommodating the pin connector (23) is provided on the valve sleeve (26). 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 set to 6° to 10°. A pin (24) is also radially penetrated on the valve core (27), and both ends of the pin (24) pass through the pin connector (23) and the valve sleeve (26) to be connected to the rotor device.

6. The 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 on 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), and the detection magnet (19), the Hall sensor (16), and the valve core (27) are coaxially arranged, and the Hall sensor (16) is used to sense the rotation of the detection magnet (19).

7. The 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.

8. 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 plugged into the connecting seat (6).

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