Servo valve comprising topological three-dimensional conformal flow channel

Abstract

Disclosed is a servo valve comprising a topological three-dimensional conformal flow channel. Conformal first, second, third and fourth topological flow channels are formed in a valve body. First oil passage holes communicated with the first topological flow channel, second oil passage holes communicated with the second topological flow channel, a third oil passage hole communicated with third topological flow channel, and a fourth oil passage hole communicated with the fourth topological flow channel are formed in a valve sleeve. A valve core is driven by a valve core driving source to axially slide in the valve sleeve, so that the blocking states of the first oil passage holes and second oil passage holes by first annular bosses and second annular bosses in the valve core can be adjusted, and the on / off state of the first topological flow channel and the second topological flow channel in the valve body can be adjusted, thereby controlling the motion state of a hydraulic cylinder communicated with the servo valve. According to the servo valve, the topological flow channels are arranged in the valve body, and under the same valve body envelope size, the flow capacity of the flow channels is improved, and fewer parts and components are used, thus leading to a smaller size.

Description

A servo valve with topological three-dimensional conformal flow channel Technical Field

[0001] The present invention relates to the technical field of servo valves, and in particular to a servo valve with a topological three-dimensional conformal flow channel. Background Art

[0002] The servo valve is an important basic hydraulic component widely used in various precision control systems. Its main function is to convert low-power input electrical signals into precise, fast, high-power liquid flow or pressure output to achieve efficient control of the system.

[0003] Traditional mechanical feedback electro-hydraulic servo valves have been developed over the past sixty years and are widely used in various fields such as industry, aerospace, and military. However, traditional mechanical feedback valves also have the following disadvantages:

[0004] 1. Limited accuracy: The accuracy of mechanical feedback systems is inherently limited, and the physical components of the feedback mechanism (such as springs and linkages) may introduce nonlinearities and hysteresis, resulting in reduced accuracy in controlling valve position.

[0005] 2. Limited response time: Mechanical systems typically have slower response times than electronic or digital control systems. This limitation can be critical in applications that require fast and precise control.

[0006] 3. Limited bandwidth: Mechanical components in feedback systems have limited bandwidth, or frequency response, which means they may have difficulty responding accurately to high-frequency input signals.

[0007] 4. Complexity: Due to the need for physical connections and feedback mechanisms, traditional mechanical feedback servo valves may have complex structures and numerous parts. This complexity increases the manufacturing cost of the servo valve and reduces its reliability. In fact, the manufacturing process of mechanical feedback servo valves is very complex, and it cannot achieve automated production and interchangeability of parts.

[0008] 5. Poor anti-contamination: Many mechanical feedback servo valves are prone to valve failure due to particle contamination. Mechanical valves require regular maintenance to ensure they work properly, which includes cleaning, lubrication and possible replacement of worn parts, which may cause downtime and increase operating costs.

[0009] 6. Low energy efficiency: The pilot stage of a mechanical feedback valve requires a certain internal leakage flow and pressure to operate. This results in the pilot stage always consuming considerable energy to maintain normal operation regardless of whether the valve is actuated. The efficiency is particularly low at higher flow rates or higher pressures. For example, the commonly used G761 series servo valve has a typical internal leakage of 2.1L / min for a valve with a flow rate of 19L / min at 7MPa. Under the standard operating condition of 21MPa, its power consumption is 0.735kW, accounting for 33.1% of its rated output power. This low efficiency does not meet the industry's technical development requirements for low emissions and low power consumption.

[0010] 7. Limited flexibility: Changing the behavior or characteristics of a mechanical feedback servo valve usually requires adjusting or replacing physical parts, a process that is often complex and costly; it is less flexible and adaptable than reprogrammable digital or electronic control systems.

[0011] Many modern industrial applications have shifted to digital or electronic control systems, which offer greater precision, faster response times, and increased adaptability compared to traditional mechanical feedback servovalves. While mechanical feedback systems are still used in some applications, their limitations have led many industries to develop and adopt more advanced control technologies. With the advancement of microelectronics, direct-drive proportional servovalves, a different type of servovalves, have gradually replaced mechanical feedback servovalves in various industrial sectors. Direct-drive proportional servovalves eliminate the pilot stage and instead use a proportional solenoid, voice coil motor, or linear force motor to directly drive the valve spool.

[0012] With the emergence of direct-drive proportional servo valves, the above-mentioned shortcomings of mechanical feedback servo valves have been compensated in some applications. In particular, direct-drive proportional servo valves have significant advantages in terms of anti-pollution performance and energy efficiency: direct-drive proportional servo valves eliminate the pilot stage design, avoiding the disadvantage of easy clogging of the pilot stage; direct-drive proportional servo valves use a linear force motor to directly drive the valve core without the need for a pilot stage to drive the power stage valve core, resulting in zero pilot stage leakage and reducing the power consumption of the valve. However, because linear force motors often cannot achieve the main valve core driving force of mechanical feedback servo valves of the same volume, direct-drive proportional servo valves often have larger volumes, slower response times, and smaller control bandwidths. The above shortcomings limit the application of direct-drive proportional servo valves, such as in the aerospace field.

[0013] To meet the volume requirements of aerospace and other fields, rotary direct-drive servo valves gradually emerged from the late 1980s to the early 21st century (patents KR100293005B1, US5722460, US4645178, US4641812, US4825904, etc.). Like direct-drive proportional servo valves, rotary direct-drive servo valves eliminate the servo valve pilot stage design. However, they use a rotary motor to convert motor torque into valve spool force through a cam-type transmission mechanism. Due to the leverage effect of the transmission mechanism, rotary direct-drive proportional servo valves can more easily obtain higher valve spool driving force under the same volume. Therefore, compared with direct-drive proportional servo valves, rotary direct-drive proportional servo valves have a volume advantage, but compared with mechanical feedback servo valves, rotary direct-drive valves are still relatively large.

[0014] With the development of drive technology, modern hydraulic servo drive control systems have increasingly demanded higher requirements for servo valve size, precision, and response speed. This is particularly true in the robotics field, where traditional servo valves are no longer able to meet the requirements of multi-degree-of-freedom hydraulic robots. Therefore, developing smaller, more responsive servo valves has become a critical task. Summary of the Invention

[0015] To this end, the technical problem to be solved by the present invention is to overcome the problem of large size of the servo valve in the prior art, and to provide a servo valve with a topological three-dimensional conformal flow channel. A topological flow channel is arranged in the valve body. Under the same valve body envelope size, the flow capacity of the flow channel is improved, and there are fewer parts, so the volume is smaller.

[0016] To solve the above technical problems, the present invention provides a servo valve with a topological three-dimensional conformal flow channel, comprising:

[0017] A valve body, wherein a first topological flow channel, a second topological flow channel, a third topological flow channel, and a fourth topological flow channel are opened in the valve body, wherein: the first topological flow channel and the second topological flow channel each include an oil inlet and multiple oil outlets, that is, there are multiple branch flow channels, the oil inlets of the first topological flow channel and the second topological flow channel are respectively connected to the external high-pressure oil and the external return oil, the third topological flow channel and the fourth topological flow channel each include an oil inlet and an oil outlet, and the oil inlets of the third topological flow channel and the fourth topological flow channel are respectively connected to the first oil chamber and the second oil chamber of the external controlled cylinder;

[0018] a valve sleeve fixedly disposed in the valve body, the valve sleeve being a cylindrical structure, and having a plurality of first oil passage holes communicating with the plurality of oil outlets of the first topology flow channel, a plurality of second oil passage holes communicating with the plurality of oil outlets of the second topology flow channel, a third oil passage hole communicating with the oil outlet of the third topology flow channel, and a fourth oil passage hole communicating with the oil outlet of the fourth topology flow channel;

[0019] a valve core movably disposed in the valve sleeve, the valve core having a first annular boss and a second annular boss capable of completely blocking the first oil passage hole and the second oil passage hole, and two annular flow channels, the two annular flow channels being respectively connected to the third oil passage hole and the fourth oil passage hole;

[0020] A valve core driving source is connected to the valve core, and the valve core driving source drives the valve core to slide axially in the valve sleeve, so that the first annular boss and the second annular boss partially block the first oil passage hole and the second oil passage hole.

[0021] In one embodiment of the present invention, the first oil channel hole and the second oil channel hole are arranged on the same straight line, the third oil channel hole and the fourth oil channel hole are arranged on the same straight line, and the first oil channel hole and the second oil channel hole are perpendicular to the direction in which the third oil channel hole and the fourth oil channel hole are arranged.

[0022] In one embodiment of the present invention, the oil inlets of the first topological flow channel, the second topological flow channel, the third topological flow channel, and the fourth topological flow channel are all arranged on the same side, the first topological flow channel and the second topological flow channel are bent and arranged in the valve body along the envelope size of the valve body, and the third topological flow channel and the fourth topological flow channel are straight-through flow channels.

[0023] In one embodiment of the present invention, the first topological flow channel and the second topological flow channel each have four oil outlets;

[0024] Four first oil passage holes and four second oil passage holes are formed on the valve sleeve corresponding to the oil outlet, wherein: two of the first oil passage holes and two of the second oil passage holes are arranged on the same side of the valve body, and the other two of the first oil passage holes and two of the second oil passage holes are correspondingly arranged on the other side of the valve body, the two first oil passage holes on the same side are located at both ends of the valve body, and the two second oil passage holes are located in the middle of the valve body;

[0025] The valve core is provided with two first annular bosses and two second annular bosses corresponding to the first oil passage hole and the second oil passage hole, and the annular flow channel is provided between the first annular boss and the second annular boss.

[0026] In one embodiment of the present invention, the cross-sectional areas of the first topological flow channel, the second topological flow channel, the third topological flow channel, and the fourth topological flow channel are the same, and the minimum cross-sectional area should satisfy:

[0027] Where: Q n is the rated flow rate, P s is the oil supply pressure, ρ is the oil density, C dis the flow coefficient, ranging from 0.60 to 0.65, and N is the number of branches of the fluid in the topological flow channel.

[0028] In one embodiment of the present invention, a through hole is further provided on the valve sleeve for the valve core driving source to pass through, and the output end of the valve core driving source passes through the through hole and is connected to the valve core to drive the valve core to move.

[0029] In one embodiment of the present invention, the valve core driving source includes:

[0030] Motor;

[0031] An eccentric shaft is connected to the output end of the motor. The eccentric shaft is not coaxial with the motor. The eccentric distance between the eccentric shaft and the motor is 0.2 to 2 mm. The eccentric shaft is driven by the motor to rotate eccentrically. The other end of the eccentric shaft is inserted into the valve core to push the valve core to move horizontally.

[0032] In one embodiment of the present invention, when the valve core is in an initial state, the first annular boss and the second annular boss can completely block the first oil channel hole and the second oil channel hole. After the valve core moves horizontally driven by the valve core driving source, the first annular boss and the second annular boss partially block the first oil channel hole and the second oil channel hole. The blocking area is changed according to the moving distance of the valve core, which can change the flow rate in the first oil channel hole and the second oil channel hole.

[0033] In one embodiment of the present invention, a ball head is provided at the end of the eccentric shaft, and a transmission hole for inserting the ball head is provided on the valve core. There is a gap between the ball head and the transmission hole, and the ball head can rotate in the transmission hole.

[0034] In one embodiment of the present invention, a sensor is further provided in the valve core driving source, and the sensor can detect the rotation angle of the rotor in the motor in real time.

[0035] The above technical solution of the present invention has the following advantages over the prior art:

[0036] The servo valve with a topological three-dimensional conformal flow channel described in the present invention is provided with a conformal first topological flow channel, a second topological flow channel, a third topological flow channel, and a fourth topological flow channel in the valve body, and a first oil channel hole, a second oil channel hole, a third oil channel hole, and a fourth oil channel hole are provided on the valve sleeve, which are connected to the first topological flow channel, the second topological flow channel, the third topological flow channel, and the fourth topological flow channel. The valve core is driven by a valve core driving source to slide axially in the valve sleeve, and the first annular boss and the second annular boss in the valve core can be adjusted to block the first oil channel hole and the second oil channel hole, so as to adjust the on-off state of the first topological flow channel and the second topological flow channel in the valve body, thereby controlling the motion state of the hydraulic cylinder connected to the servo valve; compared with the servo valve of the present invention, the servo valve with a topological three-dimensional conformal flow channel is provided with a topological flow channel in the valve body. Under the same valve body envelope size, the flow capacity of the flow channel is improved, and there are fewer parts, so the volume is smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings, wherein:

[0038] FIG1 is a schematic diagram of the exploded structure of a servo valve with a topological three-dimensional conformal flow channel according to the present invention;

[0039] FIG2 is a schematic diagram of the distribution structure of the topological flow channels in the valve body of the present invention;

[0040] FIG3 is a schematic diagram of the overall structure of the valve sleeve of the present invention;

[0041] FIG4 is a schematic structural diagram of the valve sleeve and the topological flow channel in the valve body according to the present invention;

[0042] FIG5 is a schematic structural diagram of the valve core of the present invention;

[0043] FIG6 is a schematic cross-sectional view of the valve sleeve and valve body of the present invention;

[0044] 7 is a schematic structural diagram of the servo valve controlling the hydraulic cylinder of the present invention when it is in an initial state;

[0045] 8 is a schematic structural diagram of the servo valve controlling the hydraulic cylinder of the present invention when the hydraulic cylinder is in a retracted state;

[0046] FIG9 is a schematic structural diagram of the servo valve of the present invention when the hydraulic cylinder is in an extended state.

[0047] Explanation of the reference numerals in the specification: 1. valve body; 11. first topological flow channel; 12. second topological flow channel; 13. third topological flow channel; 14. fourth topological flow channel; 2. valve sleeve; 21. first oil channel hole; 22. second oil channel hole; 23. third oil channel hole; 24. fourth oil channel hole; 25. through hole; 3. valve core; 31. first annular boss; 32. first annular boss; 33. annular flow channel; 4. eccentric shaft; 5. motor; 6. housing; 7. sensor; 8. valve cover; 9. hydraulic cylinder; 91. piston rod; 92. first oil chamber; 93. second oil chamber. DETAILED DESCRIPTION

[0048] The present invention will be further described below with reference to the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it. However, the embodiments are not intended to limit the present invention.

[0049] As shown in Figure 1, the present invention discloses a servo valve with a topological three-dimensional conformal flow channel, including: a valve body 1, a valve sleeve 2 fixedly arranged in the valve body 1, a valve core 3 movably arranged in the valve sleeve 2, a valve core driving source that drives the valve core 3 to slide, and a valve cover 8 that blocks both ends of the valve body 1.

[0050] As shown in Figure 2, the valve body 1 is provided with a first topological flow channel 11, a second topological flow channel 12, a third topological flow channel 13, and a fourth topological flow channel 14. The first topological flow channel 11, the second topological flow channel 12, the third topological flow channel 13, and the fourth topological flow channel 14 are all three-dimensional flow channels and are opened in the valve body 1 according to the shape of the valve body 1. The first topological flow channel 11 and the second topological flow channel 12 each include an oil inlet and multiple oil outlets, that is, the first topological flow channel 11 and the second topological flow channel 12 have multiple branch flow channels, the oil inlets of the first topological flow channel 11 and the second topological flow channel 12 are respectively connected to the external high-pressure oil and the external return oil, the third topological flow channel 13 and the fourth topological flow channel 14 each include an oil inlet and an oil outlet, and the oil inlets of the third topological flow channel 13 and the fourth topological flow channel 14 are respectively connected to the first oil chamber and the second oil chamber of the external controlled cylinder.

[0051] 3 and 4 , the valve sleeve 2 is a cylindrical structure, and is provided with a plurality of first oil channel holes 21 connected to the plurality of oil outlets of the first topological flow channel 11, a plurality of second oil channel holes 22 connected to the plurality of oil outlets of the second topological flow channel 12, a third oil channel hole 23 connected to the oil outlet of the third topological flow channel 13, and a fourth oil channel hole 24 connected to the oil outlet of the fourth topological flow channel 14.

[0052] Specifically, in this embodiment, the first oil channel hole 21 and the second oil channel hole 22 are arranged on the same straight line, the third oil channel hole 23 and the fourth oil channel hole 24 are arranged on the same straight line, and the first oil channel hole 21 and the second oil channel hole 22 are perpendicular to the direction in which the third oil channel hole 23 and the fourth oil channel hole 24 are arranged. The oil inlets of the first topological flow channel 11, the second topological flow channel 12, the third topological flow channel 13, and the fourth topological flow channel 14 are all arranged on the same side, so that the first topological flow channel 11 and the second topological flow channel 12 are bent and arranged in the valve body 1 along the envelope size of the valve body 1, and the third topological flow channel 13 and the fourth topological flow channel 14 are straight-through flow channels.

[0053] Moreover, in this embodiment, in order to meet the oil supply in the servo valve and improve the flow capacity of the flow channel in the servo valve, the first topology flow channel 11 and the second topology flow channel 12 are provided with four oil outlets, and the corresponding oil outlets are opened on the valve sleeve 2 with four first oil channel holes 21 and four second oil channel holes 22, wherein: two of the first oil channel holes 21 and two of the second oil channel holes 22 are arranged on the same side of the valve body 1, and the other two of the first oil channel holes 21 and two of the second oil channel holes 22 are correspondingly arranged on the other side of the valve body 1, and the two first oil channel holes 21 on the same side are located at both ends of the valve body 1, and the two second oil channel holes 22 are located in the middle position of the valve body 1, so that two groups of first oil channel holes 21 and second oil channel holes 22 are formed along the extension direction of the valve sleeve 2.

[0054] 5 and 6 , the valve core 3 has a first annular boss 31 and a second annular boss 32 that can completely block the first oil passage hole 21 and the second oil passage hole 22, and two annular flow passages 33 for oil flow. The two annular flow passages 33 are respectively connected to the third oil passage hole 23 and the fourth oil passage hole 24. The valve core driving source drives the valve core 3 to slide axially in the valve sleeve 2, and can adjust the first annular boss 31 and the second annular boss 32 in the valve core 3. By controlling the blocking state of the first oil passage hole 21 and the second oil passage hole 22, i.e., controlling the first annular boss 31 and the second annular boss 32 to completely block the first oil passage hole 21 and the second oil passage hole 22, or controlling the first annular boss 31 and the second annular boss 32 to partially block the first oil passage hole 21 and the second oil passage hole 22, the on-off state of the first topological flow channel 11 and the second topological flow channel 12 in the valve body 1 can be adjusted, thereby controlling the motion state of the hydraulic cylinder 9 connected to the servo valve;

[0055] The valve core 3 has two first annular bosses 31 and two second annular bosses 32 corresponding to the first oil passage hole 21 and the second oil passage hole 22 , and the annular flow channel 33 is provided between the first annular boss 31 and the second annular boss 32 .

[0056] Compared with the servo valve in the prior art, the servo valve of the present invention having a topological three-dimensional conformal flow channel has a topological flow channel arranged in the valve body 1. Under the same envelope size of the valve body 1, the flow capacity of the flow channel is greatly improved, and there are fewer parts, so the volume is smaller.

[0057] Taking the control of the movement of the hydraulic cylinder 9 as an example, the working state of the servo valve of the present application is described: in this embodiment, the oil inlet of the first topological flow channel 11 is connected to the external high-pressure oil, the oil inlet of the second topological flow channel 12 is connected to the external return oil, the oil inlet of the third topological flow channel 13 is connected to the first oil chamber 92 in the hydraulic cylinder 9, and the oil inlet of the fourth topological flow channel 14 is connected to the second oil chamber 93 in the hydraulic cylinder 9;

[0058] As shown in Figure 7, when in the initial state, the position of the valve core 3 in the valve sleeve 2 is fixed, that is, the first annular boss 31 and the second annular boss 32 completely block the first oil channel hole 21 and the second oil channel hole 22, and the first topological flow channel 11, the second topological flow channel 12, the third topological flow channel 13, and the fourth topological flow channel 14 in the valve body 1 are not connected. The entire servo valve will not output control force to the hydraulic cylinder 9, and the piston rod 91 in the hydraulic rod will not be forced to move.

[0059] As shown in Figure 8, when it is necessary to control the movement of the hydraulic cylinder 9, for example: control the hydraulic cylinder 9 to retract, control the valve core driving source to move the valve core 3 to the right, so that the first annular boss 31 and the second annular boss 32 on the right side partially block the first oil channel hole 21 and the second oil channel hole 22, so that the first oil channel hole 21 and the second oil channel hole 22 on the right side of the valve sleeve 2 are respectively connected to the first topological flow channel 11 and the second topological flow channel 12 in the valve body 1. Since the oil inlet of the first topological flow channel 11 is connected to the external high-pressure oil, the high-pressure oil in the first topological flow channel 11 passes through the second topological flow channel 12. An oil passage hole 21 enters the valve sleeve 2, and then passes through the fourth oil passage hole 24 through the fourth topological flow channel 14 to enter the second oil chamber 93 of the hydraulic cylinder 9; at the same time, the hydraulic oil in the first oil chamber 92 of the hydraulic cylinder 9 passes through the third topological flow channel 13, enters the valve sleeve 2 through the third oil passage hole 23, and enters the second topological flow channel 12 of the valve body 1 through the second oil passage hole 22 of the valve sleeve 2 to return oil from the outside and flow out of the valve; in summary, at this time, the second oil chamber 93 of the hydraulic cylinder 9 is in communication with the external high-pressure oil source, the first oil chamber 92 of the hydraulic cylinder 9 is in communication with the external low-pressure return oil to form a passage, and the piston rod 91 of the hydraulic cylinder 9 retracts in the direction shown in Figure 7.

[0060] As shown in Figure 9, if you want to control the hydraulic cylinder 9 to extend, control the valve core driving source to move the valve core 3 to the left, so that the first annular boss 31 and the second annular boss 32 on the left side partially block the first oil channel hole 21 and the second oil channel hole 22, so that the first oil channel hole 21 and the second oil channel hole 22 on the left side of the valve sleeve 2 are respectively connected to the first topological flow channel 11 and the second topological flow channel 12 in the valve body 1, and the high-pressure oil in the first topological flow channel 11 enters the valve sleeve 2 through the first oil channel hole 21, and then passes through the third oil channel hole 23 through the third topological flow channel 13 into the first oil chamber 92 of the hydraulic cylinder 9; at the same time, the hydraulic oil in the second oil chamber 93 of the hydraulic cylinder 9 passes through the fourth topological flow channel 14, enters the valve sleeve 2 through the fourth oil channel hole 24, and then enters the second topological flow channel 12 through the second oil channel hole 22 of the valve sleeve 2 and returns to the outside and flows out of the valve. In summary, at this time, the first oil chamber 92 of the hydraulic cylinder 9 communicates with the external high-pressure oil source, the second oil chamber 93 of the hydraulic cylinder 9 communicates with the external low-pressure return oil to form a passage, and the piston rod 91 of the hydraulic cylinder 9 extends in the direction shown in Figure 9.

[0061] In other embodiments, the oil inlet of the first topological flow channel 11 can also be set to be connected to the external high-pressure oil, and the oil inlet of the second topological flow channel 12 can be set to be connected to the external return oil. Compared with this embodiment, the movement direction of the servo valve controlling the hydraulic cylinder 9 is opposite, which will not be repeated here.

[0062] Specifically, in this embodiment, in order to ensure that the oil supply of the servo valve can control the movement of the hydraulic cylinder 9, it is necessary to limit the minimum cross-sectional area of ​​each topological flow channel in the servo valve. In order to ensure the stability of the oil pressure in each flow channel, the cross-sectional areas of the first topological flow channel 11, the second topological flow channel 12, the third topological flow channel 13, and the fourth topological flow channel 14 are set to be the same, and the minimum cross-sectional area should meet the following requirements:

[0063] Where: Q n is the rated flow rate, P s is the oil supply pressure, ρ is the oil density, C d is the flow coefficient, ranging from 0.60 to 0.65, and N is the number of branches of the fluid in the topological flow channel.

[0064] According to the above formula, the minimum cross-sectional area of ​​the topological flow channel required to be opened in different types of servo valves can be calculated to meet the structural design of different types of servo valves.

[0065] Specifically, as described in the background technology, the existing mechanical servo valve has the following defects: limited accuracy, limited response time, limited bandwidth, complex structure, poor anti-pollution ability, low energy efficiency and poor flexibility. Therefore, in the present application, the structure of the mechanical servo valve is abandoned and the servo valve is set as a digital rotary direct-drive servo valve. As shown in Figure 1, the valve core driving source includes: an eccentric shaft 4, a motor 5 and a housing 6. One end of the eccentric shaft 4 is connected to the output end of the motor 5. The eccentric shaft 4 and the motor 5 are not coaxial. The eccentric distance between the eccentric shaft 4 and the motor 5 is 0.2 to 2 mm. The eccentric shaft 4 is driven by the motor 5 to rotate eccentrically. The other end of the eccentric shaft 4 is inserted into the valve core 3. The valve sleeve 2 is also provided with a through hole 25 for the eccentric shaft 4 to pass through. The eccentric shaft 4 passes through the through hole 25 and is connected to the valve core 3 to drive the valve core 3 to move horizontally, thereby realizing control of the valve core 3.

[0066] Specifically, when the valve core 3 is in the initial state, the first annular boss 31 and the second annular boss 32 can completely block the first oil channel hole 21 and the second oil channel hole 22. After the valve core 3 moves horizontally under the drive of the valve core driving source, the first annular boss 31 and the second annular boss 32 partially block the first oil channel hole 21 and the second oil channel hole 22. According to the moving distance of the valve core 3, the blocking area is changed, and the flow rate in the first oil channel hole 21 and the second oil channel hole 22 can be changed. In this embodiment, in order to accurately control the flow rate in the first oil channel hole 21 and the second oil channel hole 22, it is necessary to control the rotation angle of the motor 5 so as to achieve the purpose of controlling the position of the eccentric shaft 4. Therefore, referring to Figure 1, a sensor 7 is also provided in the valve core driving source, and the sensor 7 can detect the rotation angle of the rotor in the motor 5 in real time.

[0067] Specifically, a ball head is provided at the end of the eccentric shaft 4, and a transmission hole for inserting the ball head is provided on the valve core 3. There is a gap between the ball head and the transmission hole, and the ball head can rotate in the transmission hole. This can ensure that the eccentric shaft 4 can drive the valve core 3 to move, without affecting the rotation of the eccentric shaft 4 itself.

[0068] The digital rotary direct-drive servo valve used in the present invention has the following advantages over the existing mechanical feedback servo valve:

[0069] There are no small-sized flow channels, so the anti-pollution performance is excellent and the reliability is high;

[0070] The stability is higher because the valve core 3 is directly and rigidly connected to the rotor of the motor 5 through the eccentric shaft 4. The valve core 3 of the traditional mechanical feedback servo valve is connected to the pilot stage through elastic elements such as the feedback rod. When the valve encounters sudden pressure changes, external shocks or high acceleration values, the valve core 3 of the present invention is rigidly connected to the motor 5, so abnormal phenomena such as oscillation and sticking will not occur.

[0071] The control accuracy and frequency response will be higher because: the valve core 3 is directly and rigidly connected to the rotor of the motor 5 through the eccentric shaft 4, and the sensor 7 directly measures the angle of the rotor. The displacement of the valve core 3 can be monitored by detecting the angle, and the control system can directly control the displacement of the valve core 3, thereby improving the control accuracy and frequency response of the valve core 3; traditional mechanical feedback servo valves generally do not monitor the displacement of the valve core 3, and there are many intermediate links, and generally cannot achieve the control accuracy and frequency response of the servo valve proposed in the present invention.

[0072] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will appreciate that other variations or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A servo valve with a topological three-dimensional conformal flow channel, characterized in that: include: A valve body, wherein a first topological flow channel, a second topological flow channel, a third topological flow channel, and a fourth topological flow channel are opened in the valve body, wherein: the first topological flow channel and the second topological flow channel each include an oil inlet and multiple oil outlets, that is, there are multiple branch flow channels, the oil inlets of the first topological flow channel and the second topological flow channel are respectively connected to the external high-pressure oil and the external return oil, the third topological flow channel and the fourth topological flow channel each include an oil inlet and an oil outlet, and the oil inlets of the third topological flow channel and the fourth topological flow channel are respectively connected to the first oil chamber and the second oil chamber of the external controlled cylinder; a valve sleeve fixedly disposed in the valve body, the valve sleeve being a cylindrical structure, and having a plurality of first oil passage holes communicating with the plurality of oil outlets of the first topology flow channel, a plurality of second oil passage holes communicating with the plurality of oil outlets of the second topology flow channel, a third oil passage hole communicating with the oil outlet of the third topology flow channel, and a fourth oil passage hole communicating with the oil outlet of the fourth topology flow channel; a valve core movably disposed in the valve sleeve, the valve core having a first annular boss and a second annular boss capable of completely blocking the first oil passage hole and the second oil passage hole, and two annular flow channels, the two annular flow channels being respectively connected to the third oil passage hole and the fourth oil passage hole; A valve core driving source is connected to the valve core, and the valve core driving source drives the valve core to slide axially in the valve sleeve, so that the first annular boss and the second annular boss partially block the first oil passage hole and the second oil passage hole.

2. The servo valve with a topological three-dimensional conformal flow channel according to claim 1, characterized in that: The first oil passage hole and the second oil passage hole are arranged on the same straight line, the third oil passage hole and the fourth oil passage hole are arranged on the same straight line, and the first oil passage hole and the second oil passage hole are perpendicular to the direction in which the third oil passage hole and the fourth oil passage hole are arranged.

3. The servo valve with a topological three-dimensional conformal flow channel according to claim 2, characterized in that: The oil inlets of the first topological flow channel, the second topological flow channel, the third topological flow channel, and the fourth topological flow channel are all arranged on the same side, the first topological flow channel and the second topological flow channel are bent and arranged in the valve body along the envelope size of the valve body, and the third topological flow channel and the fourth topological flow channel are straight-through flow channels.

4. The servo valve with a topological three-dimensional conformal flow channel according to claim 1, characterized in that: The first topology flow channel and the second topology flow channel each have four oil outlets; Four first oil passage holes and four second oil passage holes are formed on the valve sleeve corresponding to the oil outlet, wherein: two of the first oil passage holes and two of the second oil passage holes are arranged on the same side of the valve body, and the other two of the first oil passage holes and two of the second oil passage holes are correspondingly arranged on the other side of the valve body, the two first oil passage holes on the same side are located at both ends of the valve body, and the two second oil passage holes are located in the middle of the valve body; The valve core is provided with two first annular bosses and two second annular bosses corresponding to the first oil passage hole and the second oil passage hole, and the annular flow channel is provided between the first annular boss and the second annular boss.

5. The servo valve with a topological three-dimensional conformal flow channel according to claim 1, characterized in that: The cross-sectional areas of the first topological flow channel, the second topological flow channel, the third topological flow channel, and the fourth topological flow channel are the same, and the minimum cross-sectional area should satisfy: Where: Q n is the rated flow rate, P s is the oil supply pressure, ρ is the oil density, C d is the flow coefficient, ranging from 0.60 to 0.65, and N is the number of branches of the fluid in the topological flow channel.

6. The servo valve with a topological three-dimensional conformal flow channel according to claim 1, characterized in that: The valve sleeve is also provided with a through hole for the valve core driving source to pass through, and the output end of the valve core driving source passes through the through hole and is connected to the valve core to drive the valve core to move.

7. The servo valve with a topological three-dimensional conformal flow channel according to claim 6, characterized in that: The valve core driving source includes: Motor; An eccentric shaft is connected to the output end of the motor. The eccentric shaft is not coaxial with the motor. The eccentric distance between the eccentric shaft and the motor is 0.2 to 2 mm. The eccentric shaft is driven by the motor to rotate eccentrically. The other end of the eccentric shaft is inserted into the valve core to push the valve core to move horizontally.

8. The servo valve with a topological three-dimensional conformal flow channel according to claim 7, characterized in that: When the valve core is in an initial state, the first annular boss and the second annular boss can completely block the first oil channel hole and the second oil channel hole. After the valve core moves horizontally driven by the valve core driving source, the first annular boss and the second annular boss partially block the first oil channel hole and the second oil channel hole. The blocking area is changed according to the moving distance of the valve core, which can change the flow rate in the first oil channel hole and the second oil channel hole.

9. The servo valve with a topological three-dimensional conformal flow channel according to claim 7, characterized in that: A ball head is provided at the end of the eccentric shaft, and a transmission hole for inserting the ball head is provided on the valve core. There is a gap between the ball head and the transmission hole, and the ball head can rotate in the transmission hole.

10. The servo valve with a topological three-dimensional conformal flow channel according to claim 7, characterized in that: A sensor is also provided in the valve core driving source, and the sensor can detect the rotation angle of the rotor in the motor in real time.

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