Electro-hydraulic ball valve and control method thereof

Abstract

The invention provides an electro-hydraulic ball valve and a control method of the electro-hydraulic ball valve. The electro-hydraulic ball valve and the control method are suitable for media with different viscosities and high-pressure large-flow occasions. The electro-hydraulic ball valve comprises a driving assembly, a pilot stage assembly, a power stage assembly and a flow distribution valve body assembly which are integrally arranged. The driving assembly comprises a driving motor used for outputting rotation actions. The power level assembly comprises a motor end ball body and a flow distribution side ball body which are oppositely arranged, a first flow distribution groove and a second flow distribution groove are formed in the spherical surface of the flow distribution side ball body, and the first flow distribution groove and the second flow distribution groove are each of an arc-shaped groove structure with three-level gradients and different areas; the flow distribution valve body assembly comprises a connector end cover, and a P-opening pipe connector, a T-opening pipe connector, an A-opening pipe connector and a B-opening pipe connector are arranged on the connector end cover. The driving assembly drives the motor end ball body and the flow distribution side ball body to rotate through the pilot level assembly so as to switch the communication state of the first flow distribution groove and the second flow distribution groove relative to the P-opening pipe connector, the T-opening pipe connector, the A-opening pipe connector and the B-opening pipe connector.

Description

Technical Field

[0001] The present invention relates to the field of fluid transmission and control technology, and in particular to an electro-hydraulic ball valve and a control method of the electro-hydraulic ball valve. Background Art

[0002] With the continuous development of hydraulic or water pressure driven mechanical equipment such as construction machinery, mining machinery, agricultural machinery, etc., the performance requirements of mechanical products are higher. Under the huge market demand at home and abroad, it is of great significance to provide a variable opening servo valve with simple structure, convenient control, high control accuracy, wide range of applicable medium viscosity, and suitable for ultra-high pressure and large flow occasions.

[0003] The main servo valves in the existing technology are of the sliding valve type, but the sliding valve core is subjected to complex forces and has wear and leakage characteristics, so the failure rate is high and the product consistency is poor. Due to structural limitations, it is impossible to achieve high-pressure and high-flow working environments; at the same time, most of the existing servo valves are hydraulic oil media, and the efficiency is greatly reduced or even unable to work stably for low-viscosity fluid media such as water media; finally, the feedback link of the existing digital valve technology is relatively complex, and a combination of multiple mechanical structures is used to achieve closed-loop control. The complex structure leads to high product costs and large errors, making it difficult to promote and apply.

[0004] Therefore, there is an urgent need to develop a servo valve that is suitable for various viscosity media and for ultra-high pressure and large flow situations. Summary of the invention

[0005] The present invention provides an electro-hydraulic ball valve and a control method for the electro-hydraulic ball valve, so as to solve the defects of the servo valve in the prior art, such as limited application in ultra-high pressure and large flow situations, poor adaptability to media of different viscosities, high cost and large errors caused by complex structure, and realize simplification of structure, convenient control, improved control accuracy, and can be widely applied to servo valves with different viscosity media and ultra-high pressure and large flow situations.

[0006] The present invention provides an electro-hydraulic ball valve, comprising an integrated drive component, a pilot stage component, a power stage component and a distribution valve body component; the drive component comprises a drive motor for outputting a rotational motion; the power stage component comprises a motor end ball and a distribution side ball which are arranged relatively to each other, the spherical surface of the distribution side ball is provided with a first distribution groove and a second distribution groove, the first distribution groove and the second distribution groove are both arc groove structures with three-level gradients and different areas; the distribution valve body component comprises a joint end cover, the joint end cover is provided with a P-port pipe joint, a T-port pipe joint, an A-port pipe joint and a B-port pipe joint; wherein the drive component drives the motor end ball and the distribution side ball to rotate through the pilot stage component to switch the connection state of the first distribution groove and the second distribution groove relative to the P-port pipe joint, the T-port pipe joint, the A-port pipe joint and the B-port pipe joint.

[0007] According to an electro-hydraulic ball valve provided by the present invention, the pilot stage assembly includes a pilot stage valve core, a pilot stage copper sleeve, two floating blades arranged opposite to each other, and two fixed blades arranged opposite to each other, and the distribution valve body assembly includes an external pipe joint; the driving motor is transmission-coordinated with the pilot stage valve core, the pilot stage copper sleeve is coaxially arranged with the pilot stage valve core, and the floating blade and the fixed blade are arranged between the pilot stage copper sleeve and the pilot stage valve core to separate four pilot fluid chambers surrounding the pilot stage valve core. The fixed blade is fixed relative to the valve body, and the floating blade is fixed to the pilot copper sleeve, and the pilot copper sleeve is positioned and matched with the motor end ball and the distribution side ball; the pilot pressure oil is introduced into the pilot valve core through the external pipe joint, so that during the rotation process, the connection state between the pilot valve core and the pilot fluid cavity is switched, so that the pressure difference between each pilot fluid cavity acts on the floating blade, so as to drive the pilot copper sleeve to drive the motor end ball and the distribution side ball to rotate.

[0008] According to an electro-hydraulic ball valve provided by the present invention, the pilot-stage valve core is provided with a center hole, a first drainage groove and a second drainage groove, one end of the center hole is connected to the external pipe joint, and the first drainage groove and the second drainage groove are radially connected to the center hole; the floating blade is provided with a first drainage hole and a second drainage hole whose axial positions correspond to the first drainage groove and the second drainage groove respectively, one end of the first drainage hole faces the pilot-stage valve core, and the other end faces the pilot fluid cavity on one side of the floating blade, one end of the second drainage hole faces the pilot-stage valve core, and the other end faces the pilot fluid cavity on the other side of the floating blade; during the rotation of the pilot-stage valve core, the flow area size of the first drainage hole and the first drainage groove is inversely proportional to the flow area size of the second drainage hole and the second drainage groove.

[0009] According to an electro-hydraulic ball valve provided by the present invention, the pilot stage valve core is provided with a limit groove, and the limit groove is an elongated hole or groove whose length direction is perpendicular to the axis of the pilot stage valve core; the floating blade is provided with a limit column matched with the limit groove to limit the rotation angle range of the floating blade relative to the pilot stage valve core; within the rotation angle range, the first drainage hole is always connected to the first drainage groove, and the second drainage hole is always connected to the second drainage groove.

[0010] According to an electro-hydraulic ball valve provided by the present invention, the valve comprises an outer shell and a motor end cover, wherein the motor end cover and the joint end cover are respectively sealed and matched at the two ends of the outer shell, and the pilot stage component and the power stage component are both located in a sealing structure between the outer shell, the motor end cover and the joint end cover; the drive component comprises a motor junction box arranged on the outside of the motor end cover, and a motor mounting bracket arranged on the inside of the motor end cover, and the drive motor is mounted on the motor mounting bracket.

[0011] According to an electro-hydraulic ball valve provided by the present invention, a motor-end copper sleeve is arranged between the motor-end ball and the motor-end cover, and a distribution-side copper sleeve is arranged between the distribution-side ball and the joint end cover; the inner sides of the motor-end copper sleeve and the distribution-side copper sleeve both have concave spherical support structures, and the distribution-side copper sleeve is provided with through holes corresponding to the P-port pipe joint, the T-port pipe joint, the A-port pipe joint, and the B-port pipe joint, respectively; the motor-end ball and the distribution-side ball are spaced apart to form a pressure relief chamber therebetween, and a leakage pipe joint is provided on the outer shell at a position corresponding to the pressure relief chamber.

[0012] According to an electro-hydraulic ball valve provided by the present invention, a spherical spring compression screw is arranged on the side of the motor end cover facing the motor end copper sleeve; under the elastic force supporting force of the spherical spring compression screw, a wear compensation gap exists between the motor end cover and the motor end copper sleeve.

[0013] According to an electro-hydraulic ball valve provided by the present invention, the pilot stage assembly includes a motor-end pilot stage end cover and a joint-side pilot stage end cover; the two ends of the pilot stage valve core are respectively rotatably matched with the motor-end pilot stage end cover and the joint-side pilot stage end cover; the motor-end pilot stage end cover is fixed to the motor end cover, and the joint-side pilot stage end cover is fixed to the joint end cover, and the end of the pilot stage valve core facing the drive motor is provided with a spline passing through the motor-end pilot stage end cover, and the pilot stage valve core is connected to the drive shaft of the drive motor through the spline.

[0014] The present invention also provides a control method for an electro-hydraulic ball valve, which is used to control the electro-hydraulic ball valve described in any of the above embodiments; the method includes: inputting a control instruction; controlling the drive motor to output a counterclockwise rotation action or a clockwise rotation action according to the control instruction to realize an on-off combination of the pressure oil port P, the pressure oil port T, the hydraulic oil port A, and the hydraulic oil port B; the on-off combination includes a first combination of P and A being connected and B and T being connected, and a second combination of P and B being connected and A and T being connected.

[0015] According to a control method for an electro-hydraulic ball valve provided by the present invention, the electro-hydraulic ball valve has an initial state, in which the initial angle is 0°, and the pressure oil port P, the pressure oil port T, the hydraulic oil port A, and the hydraulic oil port B are all disconnected; the control instruction includes a target rotation angle based on the initial angle; the step of controlling the drive motor to output a counterclockwise rotation action or a clockwise rotation action according to the control instruction includes: controlling the drive motor to output a rotation action of the target rotation angle according to the control instruction.

[0016] The electro-hydraulic ball valve and the control method of the electro-hydraulic ball valve provided by the present invention realize effective control of media with different viscosities, and at the same time have high control accuracy, and are suitable for applications with high pressure and large flow. When the drive motor rotates, the motor end ball and the distribution side ball rotate through the action of the pilot stage assembly. The positions of the first distribution groove and the second distribution groove on the distribution side ball change relative to the P port, T port, A port and B port, thereby changing the flow path of the fluid. Since the distribution grooves have different areas, when the ball rotates, the flow area at different positions can be adjusted by precisely controlling the rotation angle, thereby adjusting the flow and pressure through the valve body. Through the integrated structural design and precise distribution groove design, the electro-hydraulic ball valve can be suitable for different media viscosities and can maintain good control performance under high pressure and large flow conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic structural diagram of the electro-hydraulic ball valve of the present invention.

[0019] Figure 2 It is a structural cross-sectional view of the electro-hydraulic ball valve of the present invention.

[0020] Figure 3 It is a radial cross-sectional view of the first drainage hole of the floating blade of the electro-hydraulic ball valve of the present invention.

[0021] Figure 4 It is a radial cross-sectional view of the second drainage hole of the floating blade of the electro-hydraulic ball valve of the present invention.

[0022] Figure 5 It is a radial cross-sectional view of the floating blade limit of the electro-hydraulic ball valve of the present invention.

[0023] Figure 6It is a radial cross-sectional view of the fixed blade limit of the electro-hydraulic ball valve of the present invention.

[0024] Figure 7 It is a schematic structural diagram of the pilot copper sleeve of the electro-hydraulic ball valve of the present invention.

[0025] Figure 8 It is a schematic structural diagram of the pilot stage valve core of the electro-hydraulic ball valve of the present invention.

[0026] Fig. 9 It is a schematic structural diagram of the flow distribution side ball of the electro-hydraulic ball valve of the present invention.

[0027] Fig.10 It is a schematic structural diagram of the motor end ball of the electro-hydraulic ball valve of the present invention.

[0028] Fig.11 It is a schematic structural diagram of the copper sleeve on the flow distribution side of the electro-hydraulic ball valve of the present invention.

[0029] Fig.12 It is a schematic structural diagram of the copper sleeve at the motor end of the electro-hydraulic ball valve of the present invention.

[0030] Fig.13 It is a schematic structural diagram of the joint end cover of the electro-hydraulic ball valve of the present invention.

[0031] Reference numerals: 1. Motor terminal box; 2. Motor end cover; 3. Motor mounting bracket; 4. Felt ring seal; 5. End cover seal ring; 6. Pilot stage copper sleeve; 8. Spherical spring compression screw; 10. Outer shell; 11. Driving motor; 12. Motor end pilot stage end cover; 13. Motor end copper sleeve; 14. Motor end ball; 15. Pilot copper sleeve fixing screw; 16. Limit column; 17. Floating positioning pin; 18. Joint end cover; 19. Pipe joint seal ring; 20. B-port pipe joint; 22. End cover positioning pin; 23. End cover fixing screw; 24. Joint side pilot stage end cover; 26. External pipe joint; 28. Pilot stage valve core; 2801. First limit groove; 2802. First drainage groove; 2803. Second drainage groove; 2804. Second limit groove; 2807, center hole; 29, A-port pipe joint; 30, distribution side ball; 3001, first distribution groove; 3002, second distribution groove; 31, distribution side copper sleeve; 33, P-port pipe joint; 34, T-port pipe joint; 35, leakage pipe joint; 3601, first fixed blade; 3602, second fixed blade; 3701, first floating blade; 3702, second floating blade; 38, first pilot fluid cavity; 39, second pilot fluid cavity; 40, third pilot fluid cavity; 41, fourth pilot fluid cavity; 4201, first drainage hole of second blade; 4202, first drainage hole of first blade; 4203, second drainage hole of second blade; 4204, second drainage hole of first blade; 44, fixing screw of fixed blade. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0033] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. It should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "set", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0034] The purpose of the present invention is to provide a rotary large-flow electro-hydraulic ball valve and a control method thereof. The present invention changes the contact area between the pilot valve core control chamber and the pilot pressure oil drainage port through the rotation angle of the ball valve pilot valve core, completes the feedback and follow-up of the ball valve and the pilot valve core rotation angle under the drive of the pilot pressure oil, and realizes rapid response and high-precision control; adopts two three-level distribution grooves with different gradient areas to realize the function of the three-position four-way electromagnetic reversing valve and variable opening flow, adopts a spherical support sealing method to provide sealing wear compensation by the spherical spring compression screw, realizes high efficiency, low driving power, high stability, high-precision control of the hydraulic valve and is suitable for various viscosity media.

[0035] Combine the following Figures 1 to 13 A specific embodiment of the electro-hydraulic ball valve of the present invention is described.

[0036] like Figure 1 , Figure 2 , Fig. 9 , Fig.10 and Fig.13As shown, the present invention provides an electro-hydraulic ball valve, including an integrated drive assembly, a pilot stage assembly, a power stage assembly and a distribution valve body assembly. The drive assembly includes a drive motor 11 for outputting a rotational motion. The power stage assembly includes a motor end ball 14 and a distribution side ball 30 that are relatively arranged, and the spherical surface of the distribution side ball 30 is provided with a first distribution groove 3001 and a second distribution groove 3002, and the first distribution groove 3001 and the second distribution groove 3002 are both arc groove structures with three-level gradients and different areas. The distribution valve body assembly includes a joint end cover 18, and the joint end cover 18 is provided with a P-port pipe joint 33, a T-port pipe joint 34, an A-port pipe joint 29, and a B-port pipe joint 20. Among them, the driving component drives the motor 11 end ball and the distribution side ball 30 to rotate through the pilot stage component to switch the connection status of the first distribution groove 3001 and the second distribution groove 3002 relative to the P-port pipe joint 33, T-port pipe joint 34, A-port pipe joint 29, and B-port pipe joint 20.

[0037] Specifically, the electro-hydraulic ball valve is composed of four main parts: a drive component, a pilot stage component, a power stage component and a distribution valve body component. Among them, the drive component includes a drive motor 11, which is responsible for outputting rotational motion; the power stage component is composed of a motor end ball 14 and a distribution side ball 30. The surface of the distribution side ball 30 is provided with two arc-shaped distribution grooves (the first distribution groove 3001 and the second distribution groove 3002) with three-level gradient change areas. This design can accurately control the flow direction and flow rate of the fluid; and the distribution valve body component includes a joint end cover 18, on which four pipe joints (P port, T port, A port and B port) are installed for connecting different fluid channels. The entire system drives the two balls to rotate through the drive component through the pilot stage component, thereby changing the connection state between the first distribution groove 3001 and the second distribution groove 3002 and these pipe joints, thereby realizing precise control of the fluid direction and flow rate. This design is not only simple in structure and easy to control, but also can adapt to media of different viscosities and maintain good performance in ultra-high pressure and high flow application scenarios.

[0038] The pilot stage component of the electrohydraulic ball valve is one of the key parts to achieve precise control, such as Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 ,and Figure 8As shown, according to an electro-hydraulic ball valve provided by the present invention, the pilot stage assembly includes a pilot stage valve core 28, a pilot stage copper sleeve 6, two floating blades arranged opposite to each other, and two fixed blades arranged opposite to each other. The distribution valve body assembly includes an external pipe joint 26. The driving motor 11 is in transmission cooperation with the pilot stage valve core 28, the pilot stage copper sleeve 6 is coaxially arranged with the pilot stage valve core 28, the floating blades and the fixed blades are arranged between the pilot stage copper sleeve 6 and the pilot stage valve core 28 to separate four pilot fluid chambers around the pilot stage valve core 28, the fixed blades are fixed relative to the valve body, the floating blades are fixed to the pilot stage copper sleeve 6, and the pilot stage copper sleeve 6 is positioned and cooperated with the motor end ball 14 and the distribution side ball 30. The pilot stage valve core 28 is introduced with pilot pressure oil through the external pipe joint 26, so that during the rotation process, the connection state between the pilot stage valve core 28 and the pilot fluid cavity is switched, so that the pressure difference between the pilot fluid cavities acts on the floating blades to drive the pilot stage copper sleeve 6 to drive the motor end ball 14 and the distribution side ball 30 to rotate.

[0039] Specifically, four pilot fluid chambers are formed between the two floating blades and the two fixed blades. The fixed blades are fixed relative to the valve body, while the floating blades are fixed on the pilot copper sleeve 6. The pilot copper sleeve 6 is coaxially arranged with the pilot valve core 28, and is positioned and matched with the motor end ball 14 and the distribution side ball 30 to ensure that they can rotate synchronously. When the drive motor 11 is started, it will drive the pilot valve core 28 to rotate. At this time, the pilot pressure oil is introduced into the pilot valve core 28 through the external pipe joint 26. As the pilot valve core 28 rotates, the connection state with the four pilot fluid chambers will change, resulting in a difference in pressure between the pilot fluid chambers. This pressure difference will act on the floating blades, causing the pilot copper sleeve 6 to start rotating. Since the pilot copper sleeve 6 is positioned and matched with the motor end ball 14 and the distribution side ball 30, the rotation of the pilot copper sleeve 6 will drive the two balls to rotate together, thereby changing the position of the first distribution groove 3001 and the second distribution groove 3002, and finally realizing the control of the fluid direction and flow in the main valve body.

[0040] According to an electro-hydraulic ball valve provided by the present invention, the pilot stage valve core 28 is provided with a center hole 2807, a first drainage groove 2802 and a second drainage groove 2803, one end of the center hole 2807 is connected to the external pipe joint 26, and the first drainage groove 2802 and the second drainage groove 2803 are radially connected to the center hole 2807. The floating blade is provided with a first drainage hole and a second drainage hole corresponding to the first drainage groove 2802 and the second drainage groove 2803 in axial positions, one end of the first drainage hole faces the pilot stage valve core 28, and the other end faces the pilot fluid cavity on one side of the floating blade, and one end of the second drainage hole faces the pilot stage valve core 28, and the other end faces the pilot fluid cavity on the other side of the floating blade. During the rotation of the pilot stage valve core 28, the flow area of ​​the first drainage hole and the first drainage groove 2802 is inversely proportional to the flow area of ​​the second drainage hole and the second drainage groove 2803. When the pilot stage valve core 28 rotates, the flow area between the first drainage hole and the first drainage groove 2802 will change accordingly. At the same time, the flow area between the second drainage hole and the second drainage groove 2803 will also change accordingly, but the flow area changes of the two are inversely proportional. This means that when the flow area of ​​the first drainage hole and the first drainage groove 2802 increases, the flow area of ​​the second drainage hole and the second drainage groove 2803 will decrease, and vice versa. This design enables the pilot stage component to drive the floating blades by accurately controlling the pressure difference of each pilot fluid chamber during rotation, thereby driving the pilot stage copper sleeve 6 to rotate, and finally controlling the rotation of the motor end ball 14 and the distribution side ball 30 to achieve precise regulation of the fluid direction and flow rate.

[0041] According to an electro-hydraulic ball valve provided by the present invention, a limiting groove is provided on the pilot stage valve core 28, and the limiting groove is a long hole or groove whose length direction is perpendicular to the axis of the pilot stage valve core 28; a limiting column 16 is provided on the floating blade to match the limiting groove to limit the rotation angle range of the floating blade relative to the pilot stage valve core 28; within the rotation angle range, the first drainage hole is always connected to the first drainage groove 2802, and the second drainage hole is always connected to the second drainage groove 2803. The function of the limiting column 16 is to limit the rotation angle range of the floating blade relative to the pilot stage valve core 28, and ensure that the floating blade can only rotate within a specific angle range.

[0042] Specifically, during the rotation of the pilot stage valve core 28, the limit column 16 will move in the limit groove to limit the maximum rotation angle of the floating blade. Within this rotation angle range, the first drainage hole is always connected to the first drainage groove 2802, and the second drainage hole is always connected to the second drainage groove 2803. This design ensures that no matter how the pilot stage valve core 28 rotates, the first drainage hole and the second drainage hole on the floating blade will remain connected to the first drainage groove 2802 and the second drainage groove 2803 on the pilot stage valve core 28, thereby ensuring that the pilot stage assembly can continuously and effectively control the pressure changes in the pilot fluid chamber, thereby achieving precise control of the entire electro-hydraulic ball valve. This limiting mechanism helps to improve the reliability and stability of the system, while also simplifying the control process.

[0043] An electro-hydraulic ball valve provided according to the present invention includes an outer shell 10 and a motor end cover 2, wherein the motor end cover 2 and the joint end cover 18 are respectively sealed and matched at both ends of the outer shell 10, and the pilot stage component and the power stage component are both located in the sealing structure between the outer shell 10, the motor end cover 2 and the joint end cover 18. The motor end cover 2 and the joint end cover 18 are respectively sealed and matched with both ends of the outer shell 10 to form a closed space, ensuring that the pilot stage component and the power stage component are both safely placed inside the sealing structure to prevent external impurities from entering and protect the internal components from damage. The drive component includes a motor junction box 1 arranged on the outside of the motor end cover 2, and a motor mounting bracket 3 arranged on the inside of the motor end cover 2, and the drive motor 11 is mounted on the motor mounting bracket 3.

[0044] like Fig.11 and Fig.12 As shown, according to an electro-hydraulic ball valve provided by the present invention, a motor-end copper sleeve 13 is arranged between the motor-end ball 14 and the motor-end cover 2, and a distribution-side copper sleeve 31 is arranged between the distribution-side ball 30 and the joint end cover 18. The inner sides of the motor-end copper sleeve 13 and the distribution-side copper sleeve 31 both have concave spherical support structures, which can ensure that the motor-end ball 14 and the distribution-side ball 30 are stably supported during rotation. The distribution-side copper sleeve 31 is provided with through holes corresponding to the P-port pipe joint 33, the T-port pipe joint 34, the A-port pipe joint 29, and the B-port pipe joint 20, respectively, for connecting various fluid interfaces to ensure that the fluid can flow along a predetermined path. The motor-end ball 14 and the distribution-side ball 30 are arranged at intervals to form a pressure relief chamber between the two. At the position corresponding to the pressure relief chamber, the outer shell 10 is provided with a leakage pipe joint 35 to guide the possible leakage fluid out to avoid abnormal increase in internal pressure and damage to the system.

[0045] According to an electro-hydraulic ball valve provided by the present invention, a spherical spring compression screw 8 is provided on the side of the motor end cover 2 facing the motor end copper sleeve 13, and the elastic force provided by the spherical spring compression screw 8 is used to support the contact between the motor end cover 2 and the motor end copper sleeve 13. Under the elastic force support of the spherical spring compression screw 8, there is a wear compensation gap between the motor end cover 2 and the motor end copper sleeve 13. The wear compensation gap exists to cope with the wear that may occur during long-term operation. By reserving a certain gap, even if there is slight wear between the components, it will not cause poor contact or jamming, thereby ensuring the stability and reliability of the electro-hydraulic ball valve in long-term use.

[0046] According to an electro-hydraulic ball valve provided by the present invention, the pilot stage assembly includes a motor-end pilot stage end cover 12 and a joint-side pilot stage end cover 24. The two ends of the pilot stage valve core 28 are respectively rotatably matched with the motor-end pilot stage end cover 12 and the joint-side pilot stage end cover 24. The motor-end pilot stage end cover 12 is fixed to the motor end cover 2, and the joint-side pilot stage end cover 24 is fixed to the joint end cover 18. The end of the pilot stage valve core 28 facing the drive motor 11 is provided with a spline passing through the motor-end pilot stage end cover 12, and the pilot stage valve core 28 is connected to the drive shaft of the drive motor 11 through the spline. Through the spline, the pilot stage valve core 28 and the drive shaft of the drive motor 11 achieve a highly synchronized mechanical connection. When the drive motor 11 is running, it will transmit torque to the pilot stage valve core 28 through the spline, thereby driving the pilot stage valve core 28 to rotate.

[0047] like Figures 1 to 13 As shown, according to the electro-hydraulic ball valve of the preferred embodiment of the present invention, the electro-hydraulic ball valve structure includes a drive assembly, a pilot stage assembly, a power stage assembly and a distribution valve body assembly.

[0048] The drive assembly preferably includes a motor junction box 1, a motor end cover 2, a felt ring seal 4, an end cover seal 5, a motor mounting bracket 3, a spherical spring compression screw 8 and a drive motor 11. The drive motor 11 is mounted on the second mounting surface of the motor mounting bracket 3. When the motor connection port is energized, the magnetic field generated between the stator and rotor assembly of the motor generates a torque, causing the rotor assembly to rotate, thereby driving the rotating shaft of the drive motor 11 to move.

[0049] The pilot stage valve core 28 of the pilot stage assembly is connected to the rotating shaft of the driving motor 11 through a spline. When the motor rotating shaft rotates, the pilot stage valve core 28 is driven to rotate. The first to fourth pilot fluid chambers 41 are composed of two groups of fixed blades, two groups of floating blades, the pilot stage valve core 28 and the pilot stage copper sleeve 6. The floating blades are connected to the pilot stage copper sleeve 6 and the pilot stage valve core 28 through the pilot copper sleeve fixing screws 15, the limit column 16, and the floating positioning pin 17. The limit column 16 can limit the maximum relative rotation angle between the floating blade and the pilot valve core to ensure the effectiveness of the distribution area. The fixed blades are in contact with the pilot stage copper sleeve 6 and the pilot stage valve core 28 through surface contact, and are fixed to the end covers on both sides by the fixed blade fixing screws 44. When the motor drive shaft rotates, it drives the pilot stage valve core 28 to rotate, and the fluid medium enters the central hole 2807 through the external pipe joint 26, and then enters the first and second drainage grooves 2803 of the pilot stage valve core 28; at the same time, the fluid medium enters the three-stage stepped distribution groove through the P-port pipe joint 33 to realize spherical distribution.

[0050] The power stage assembly includes a motor end copper sleeve 13, a motor end ball 14, a flow distribution side ball 30, a flow distribution side copper sleeve 31, and a spherical spring compression screw 8. The first mounting surface of the motor end copper sleeve 13 is connected to the second mounting surface of the motor end cover 2 through the spherical spring compression screw 8, and the inner circumference of the motor end copper sleeve 13 is connected to the motor end ball 14. The second mounting surface of the flow distribution side copper sleeve 31 is connected to the first mounting surface of the joint end cover 18, and the inner circumference of the flow distribution side copper sleeve 31 is connected to the flow distribution side ball 30. The inner circumference of the power stage valve core is connected to the pilot stage copper sleeve 6, and the synchronous rotation with the floating blade is achieved through the floating positioning pin 17 and the boss of the pilot stage copper sleeve 6. The surface of the distribution side sphere 30 in the preferred embodiment is processed with two distribution grooves with three-level gradients and different areas. When it is relatively matched and rotated with the distribution hole of the distribution side copper sleeve 31, three different constant flow areas can be achieved. For example, at a rated pressure difference of 4MPa and emulsion medium, the stable flow rates are 100, 300, and 600L / min respectively.

[0051] The distribution valve body assembly includes a rubber gasket, a joint end cover 18, an outer shell 10, a pipe joint sealing ring 19, an external pipe joint 26, an end cover positioning pin 22, an end cover fixing screw 23, a joint side pilot stage end cover 24, a P-port pipe joint 33, a T-port pipe joint 34, an A-port pipe joint 29, a B-port pipe joint 20, and a leakage pipe joint 35. The first mounting surface of the outer shell 10 is connected to the first mounting surface of the motor end cover 2 through a rubber gasket, and the second mounting surface of the outer shell 10 is connected to the first mounting surface of the joint end cover 18 through a rubber gasket. The leakage pipe joint 35 is installed on the outer mounting surface of the outer shell 10, and the P-port pipe joint 33, the A-port pipe joint 29, the B-port pipe joint 20, the T-port pipe joint 34, and the external pipe joint 26 are installed on the second mounting surface of the joint end cover 18. The function of the distribution valve body assembly is to realize the flow distribution to each pipe interface as the power stage valve core rotates.

[0052] Based on the above structure, the process of the pilot stage valve core 28 driving the power stage valve core to realize the three-stage flow distribution is as follows: Taking the counterclockwise rotation angle control analysis as an example, when the first drainage groove 2802 in the pilot stage valve core 28 rotates to a larger area connected with the first drainage hole 4202 of the first blade and the first drainage hole 4201 of the second blade, the high-pressure fluid medium in the first drainage groove 2802 of the pilot stage valve core 28 enters the third pilot fluid chamber 40 and the fourth pilot fluid chamber 41 through the first drainage hole 4202 of the first blade and the first drainage hole 4201 of the second blade. At the same time, the second drainage groove 2803 in the pilot stage valve core 28 rotates to a smaller area connected with the second drainage hole 4204 of the first blade and the first drainage hole 4202 of the first blade, and the low-pressure fluid medium in the second drainage groove 2803 of the pilot stage valve core 28 enters the first pilot fluid chamber 38 and the second pilot fluid chamber 39 through the second drainage hole 4204 of the first blade and the first drainage hole 4202 of the first blade. In this state, the first floating blade 3701 and the second floating blade 3702 push the power stage valve core to rotate through the floating positioning pin 17 and the pilot stage copper sleeve 6 under the pressure difference between the high pressure fluid medium and the low pressure fluid medium in the pilot fluid chamber, and the three distribution grooves with different areas on the power stage ball valve core realize three-level flow distribution during the rotation process. Finally, the driving motor 11 controls the rotation angle of the pilot stage valve core 28, thereby realizing the final rotation angle control of the power stage ball valve core.

[0053] The present invention realizes combined on-off control of the pressure oil port P, the pressure oil port T, the hydraulic oil port A and the hydraulic oil port B through a two-stage transmission ball valve structure, wherein when the valve core rotates counterclockwise, the pressure oil port P is connected with the hydraulic oil port A, and the hydraulic oil port B is connected with the pressure oil port T; when the valve core rotates clockwise, the pressure oil port P is connected with the hydraulic oil port B, and the pressure oil port T is connected with the hydraulic oil port A.

[0054] The control method of the electro-hydraulic ball valve provided by the present invention is described below. The control method of the electro-hydraulic ball valve described below and the electro-hydraulic ball valve described above can be referred to each other.

[0055] The present invention also provides a control method for an electro-hydraulic ball valve, which is used to control the electro-hydraulic ball valve of any of the above embodiments; the method comprises: Step 100: Input control instructions.

[0056] The control system receives control signals or instructions from the outside, which are usually issued by the operator or generated by the automatic control system. The control instructions can be digital signals, analog signals or a specific communication protocol data packet, which are used to instruct the electro-hydraulic ball valve to perform a specific action.

[0057] Step 200: According to the control instruction, the drive motor 11 is controlled to output a counterclockwise rotation action or a clockwise rotation action to realize the on-off combination of the pressure oil port P, the pressure oil port T, the hydraulic oil port A, and the hydraulic oil port B. The on-off combination includes a first combination of P and A being connected and B and T being connected, and a second combination of P and B being connected and A and T being connected.

[0058] According to the control command received, the control system will analyze the type of action to be performed, that is, counterclockwise or clockwise rotation. The control system then sends a corresponding control signal to the drive motor 11 to start the motor and make it rotate in the specified direction. The drive motor 11 drives the pilot stage valve core 28 to rotate through its rotating shaft, thereby controlling the working state of the entire electro-hydraulic ball valve.

[0059] Among them, in the first combination, when the pilot stage valve core 28 rotates counterclockwise, the pressure oil port P is connected with the hydraulic oil port A, and the hydraulic oil port B is connected with the pressure oil port T. In this case, the fluid medium input from the pressure oil port P will flow to the hydraulic oil port A, and the fluid in the hydraulic oil port B will be discharged into the pressure oil port T.

[0060] In the second combination, when the pilot stage spool 28 rotates clockwise, the pressure oil port P is connected to the hydraulic oil port B, and the hydraulic oil port A is connected to the pressure oil port T. In this case, the fluid medium input from the pressure oil port P will flow to the hydraulic oil port B, and the fluid in the hydraulic oil port A will be discharged into the pressure oil port T.

[0061] In practical applications, first ensure that the electro-hydraulic ball valve is in an initial position or a known position so that subsequent control actions can be performed correctly. Initialization may include checking the status of the drive motor 11 to ensure that all components are ready to receive new control instructions. Receive a control instruction from the control system or operator, which contains information about the required on-off combination. Parse the control instruction to determine the required direction of rotation (counterclockwise or clockwise) and the expected on-off combination (first combination or second combination). According to the results of the analysis, control the drive motor 11 to output a rotation action in the corresponding direction. If the first combination needs to be achieved, the motor is controlled to rotate counterclockwise; if the second combination needs to be achieved, the motor is controlled to rotate clockwise. Monitor the rotation state of the motor to ensure that it rotates in the expected manner. A sensor can be used to detect the actual position of the pilot stage valve core 28 to verify whether the predetermined on-off combination has been achieved. Confirming that the electro-hydraulic ball valve has achieved the required on-off combination can be accomplished by detecting the flow of the fluid medium in each pipe port.

[0062] After the control action is completed, the motor can be stopped and the system can be placed in a standby state to wait for the next control instruction. Through the above control method, the on-off combination of the electro-hydraulic ball valve can be effectively controlled, thereby achieving precise control of the hydraulic system.

[0063] In combination with the electro-hydraulic ball valve described above, when the drive motor 11 receives an electrical signal, the coil inside the motor generates a magnetic field. The magnetic field interaction between the motor stator and the rotor generates a torque, which causes the rotor to start rotating. The rotor is connected to the pilot stage valve core 28 through a spline connection mechanism, so the rotation of the rotor is directly transmitted to the pilot stage valve core 28. The rotation of the pilot stage valve core 28 is directly driven by the rotor of the drive motor 11. The rotation of the pilot stage valve core 28 causes the floating blade connected thereto to rotate. There are drainage holes on the floating blade, and when the pilot stage valve core 28 rotates, these drainage holes allow the fluid medium to pass through the pilot fluid cavity. Due to the structural design of the pilot fluid cavity, a pressure difference is formed in the cavity when the fluid medium passes through. The force of the pressure difference drives the power stage valve core to rotate, thereby realizing the on-off control of the fluid medium. This linkage mechanism established between the pilot stage valve core 28 and the power stage valve core provides two-level mechanical position feedback. The first level of feedback comes from the rotation position of the pilot stage valve core 28, which directly affects the position of the floating blade. The second-level feedback indirectly affects the position of the power-level valve core through the position change of the floating vane, thereby controlling the flow direction of the fluid medium. This two-level feedback mechanism ensures that the electro-hydraulic ball valve can work accurately according to the preset control instructions.

[0064] In summary, the control method of the electro-hydraulic ball valve is to drive the pilot stage valve core 28 to rotate by the driving motor 11, and then drive the floating blade by the pilot stage valve core 28, and use the pressure difference of the fluid medium to drive the power stage valve core, and finally realize the control of the fluid medium on and off. This two-stage mechanical position feedback design ensures the accuracy and stability of the control process.

[0065] According to a control method of an electro-hydraulic ball valve provided by the present invention, the electro-hydraulic ball valve has an initial state, in which the initial angle is 0°, and the pressure oil port P, the pressure oil port T, the hydraulic oil port A, and the hydraulic oil port B are all disconnected. The above control instruction preferably includes a target rotation angle based on the initial angle. That is, the control instruction includes information on the target rotation angle, which is based on the initial angle (0°). The control instruction can be counterclockwise rotation or clockwise rotation to achieve different on-off combinations.

[0066] On this basis, the step of controlling the drive motor 11 to output a counterclockwise rotation action or a clockwise rotation action according to the control instruction preferably further includes: Step 201: Control the drive motor 11 to output a rotation motion of a target rotation angle according to a control instruction.

[0067] Specifically, the control system receives a control instruction from the outside, which specifies the required target rotation angle. Based on the received control instruction, the control system calculates the target rotation angle and determines whether the drive motor 11 needs to rotate counterclockwise or clockwise. When counterclockwise rotation is required, the control system will send a control signal for counterclockwise rotation to the drive motor 11. When clockwise rotation is required, the control system will send a control signal for clockwise rotation to the drive motor 11. After the drive motor 11 receives the control signal, a magnetic field is generated between the stator and the rotor of the motor through the coil, and the interaction generates a torque to drive the motor to rotate. The motor drives the pilot stage valve core 28 to rotate through a spline connection to achieve a predetermined target rotation angle. The rotation of the pilot stage valve core 28 causes the fluid medium to flow into the pilot fluid cavity through the drainage hole of the floating blade, generating a pressure difference. The pressure difference acts on the floating blade, and drives the power stage valve core to rotate through the floating positioning pin 17 and the pilot stage copper sleeve 6. The distribution grooves of different areas on the power stage valve core realize three-level flow distribution during the rotation process, thereby realizing the on-off combination of pressure oil port P, pressure oil port T, hydraulic oil port A, and hydraulic oil port B. Among them, when the pilot stage valve core 28 rotates counterclockwise, the first combination can be realized: the pressure oil port P is connected with the hydraulic oil port A, and the hydraulic oil port B is connected with the pressure oil port T. When the pilot stage valve core 28 rotates clockwise, the second combination can be realized: the pressure oil port P is connected with the hydraulic oil port B, and the hydraulic oil port A is connected with the pressure oil port T. In this way, the electro-hydraulic ball valve can realize precise on-off control of the fluid medium according to the control instructions, thereby meeting the needs of different application scenarios.

[0068] In combination with the electro-hydraulic ball valve and control method thereof according to the preferred embodiment of the present invention, the specific control scheme is as follows: When the control command is for PA to be connected and BT to be connected: rotate counterclockwise by an angle of α° (the flow rate is XL / min at this time) for detailed analysis (the relationship between the angle and the flow rate is determined by the specific size structure of the rotary valve, and no restrictions are imposed here).

[0069] The pilot valve angle control process is as follows: the electrical control signal that inputs the command to rotate counterclockwise by an angle of α° generates a magnetic field between the motor stator and the motor rotor through the motor coil, and the interaction generates a torque that drives the drive motor 11 to rotate counterclockwise by α°. The drive motor 11 is connected to the pilot stage valve core 28 through a spline, thereby driving the pilot stage valve core 28 to rotate counterclockwise by α°.

[0070] The high-pressure chamber of the pilot valve is controlled as follows: the first pressure oil enters the center hole 2107 through the pilot valve core oil inlet pipe joint 22, and then enters the first drainage groove 2102 of the pilot valve core. At this time, the pilot valve core 21 rotates counterclockwise by α° to rotate the first drainage groove 2102 of the pilot valve core to a larger connection area with the first drainage hole 3302 of the first floating blade and the first drainage hole 3301 of the second floating blade. The high-pressure fluid medium in the first drainage groove 2102 of the pilot valve core enters the third pilot fluid chamber 30 and the fourth pilot fluid chamber 31 through the first drainage hole 3302 of the first floating blade and the first drainage hole 3301 of the second floating blade, thereby causing the pressure in their fluid chambers to increase.

[0071] The low-pressure chamber of the pilot valve is controlled as follows: the first pressure oil enters the central hole 2107 through the pilot valve core oil inlet pipe joint 22, and then enters the second drainage groove 2103 of the pilot valve core. At this time, the pilot valve core 21 rotates counterclockwise by α°, and the connection area between the second drainage groove 2103 of the pilot valve core and the second drainage hole 3304 of the first floating blade and the second drainage hole 3303 of the second floating blade is reduced. The low-pressure fluid medium in the second drainage groove 2103 of the pilot valve core enters the first pilot fluid chamber 28 and the second pilot fluid chamber 29 through the second drainage hole 3304 of the first floating blade and the second drainage hole 3303 of the second floating blade, thereby reducing the pressure in the fluid chamber.

[0072] The process of the pilot-stage valve core driving the power-stage valve core to rotate is as follows: the driving motor 11 drives the pilot-stage valve core 28 to rotate counterclockwise by α°. Since the pilot-stage valve core 28 moves before the power-stage ball valve, the angle difference caused by the pilot-stage valve core first drainage groove 2802 rotates to a point where the connection area with the first drainage hole 4202 of the first floating blade and the first drainage hole 4201 of the second floating blade is larger than the connection area between the pilot-stage valve core second drainage groove 2803 and the first floating blade second drainage hole 4204 and the second floating blade second drainage hole 4203. At this time, the third pilot fluid chamber 30 and the fourth pilot fluid chamber 31 are high-pressure oil chambers, and the first pilot fluid chamber 28 and the second pilot fluid chamber 29 are low-pressure oil chambers. Therefore, the first floating blade 2701 and the second floating blade 2702 drive the power-stage ball valve core 16 to rotate counterclockwise through the transmission pin 32 under the action of the pressure difference between the high-pressure fluid medium and the low-pressure fluid medium in the pilot fluid chamber.

[0073] The power output process of the power stage valve core is as follows: under the drive of the pilot stage valve core 21, the second hydraulic oil enters the first distribution groove 1601 from the P port pipe joint 15 and then outputs to the A port pipe joint 25 to realize the circulation of PA; at the same time, the third hydraulic oil flows in from the B port pipe joint 24, flows out to the T port pipe joint 23 through the second distribution groove 1604, and realizes the circulation of BT. According to the example analysis, 0°-5° is the first step flow adjustment range, and this angle range can realize the stepless control output of 0-100L / min flow, 5°-7° is the first step stable flow angle range, and this angle range can realize the stable output of 100L / min flow, 7°-16° is the first step flow adjustment angle range, and this angle range can realize 100-300 L / min flow rate can be infinitely regulated and outputted, 16°-18° is the first step stable flow angle range, this angle range can achieve a stable output of 300L / min flow rate, 18°-36° is the first step flow adjustment angle range, this angle range can achieve a stepless regulation and output of 300-600L / min flow rate, 36°-38° is the first step stable flow angle range, this angle range can achieve a stable output of 600L / min flow rate, and realize the grading and constant flow distribution of spherical flow distribution. In the embodiment, at a rated pressure difference of 4MPa and emulsion medium, the stable flow rates are 100, 300, and 600L / min respectively, wherein there is a response error of ±1°, and a constant flow output can still be achieved, meeting the needs of multi-stage constant and precise flow output.

[0074] The correction process of the angle following overshoot is as follows: when the overshoot of the rotation angle of the power stage ball valve is greater than the rotation angle of the pilot stage valve core 28, the reverse angle difference generated causes the first drainage groove 2802 of the pilot stage valve core to rotate to a connection area with the first drainage hole 4202 of the first floating blade and the first drainage hole 4201 of the second floating blade, which is smaller than the connection area between the second drainage groove 2803 of the pilot stage valve core and the second drainage hole 4204 of the first floating blade and the second drainage hole 4203 of the second floating blade. At this time, the third pilot fluid chamber 30 and the first The four pilot fluid chambers 31 are low-pressure oil chambers, and the first pilot fluid chamber 28 and the second pilot fluid chamber 29 are high-pressure oil chambers. Therefore, under the action of the pressure difference between the high-pressure fluid medium and the low-pressure fluid medium in the pilot fluid chamber, the first floating blade 3701 and the second floating blade 3702 drive the power-stage ball valve core to rotate clockwise through the floating blade locating pin 17 and the boss of the pilot-stage copper sleeve 6, thereby correcting the overshoot angle; through the joint action of the above-mentioned response and overshoot correction links, the feedback and following of the rotation angle of the ball valve and the pilot valve core are completed.

[0075] When the control instruction is that PB is connected and AT is connected: a detailed analysis is performed by rotating α° clockwise (the flow rate is XL / min at this time) (the relationship between the rotation angle and the flow rate is determined by the specific size structure of the rotary valve, and no limitation is imposed here).

[0076] The pilot valve angle control process is as follows: the electrical control signal that inputs the command to rotate clockwise by an angle of α° generates a magnetic field between the motor stator and the motor rotor through the motor coil, and the interaction generates a torque that drives the drive motor 11 to rotate clockwise by α°. The drive motor 11 is connected to the pilot stage valve core 28 through a spline and then drives the pilot stage valve core 28 to rotate clockwise by α°.

[0077] The high-pressure chamber of the pilot valve is controlled as follows: the first pressure oil enters the center hole 2107 through the pilot valve core oil inlet pipe joint 22, and then enters the second drainage groove 2103 of the pilot valve core. At this time, the pilot valve core 21 rotates clockwise by α° to rotate the second drainage groove 2103 of the pilot valve core to a larger connection area with the second drainage hole 3304 of the first floating blade and the second drainage hole 3303 of the second floating blade. The high-pressure fluid medium in the second drainage groove 2103 of the pilot valve core enters the first pilot fluid chamber 28 and the second pilot fluid chamber 29 through the second drainage hole 3304 of the first floating blade and the second drainage hole 3303 of the second floating blade, thereby causing the pressure in the fluid chamber to increase.

[0078] The low-pressure chamber of the pilot valve is controlled as follows: the first pressure oil enters the central hole 2107 through the pilot valve core oil inlet pipe joint 22, and then enters the first drainage groove 2102 of the pilot valve core. At this time, the pilot valve core 21 rotates counterclockwise by α°, and the connection area between the first drainage groove 2102 of the pilot valve core and the first drainage hole 3302 of the first floating blade and the first drainage hole 3301 of the second floating blade is reduced. The low-pressure fluid medium in the first drainage groove 2102 of the pilot valve core enters the third pilot fluid chamber 30 and the fourth pilot fluid chamber 31 through the first drainage hole 3302 of the first floating blade and the first drainage hole 3301 of the second floating blade, thereby reducing the pressure in the fluid chamber.

[0079] The process of the pilot-stage valve core driving the power-stage valve core to rotate is as follows: the driving motor 11 drives the pilot-stage valve core 28 to rotate clockwise by α°. Since the pilot-stage valve core 28 moves before the power-stage ball valve, the angle difference caused by the pilot-stage valve core first drainage groove 2802 rotates to a point where the connection area with the first drainage hole 4202 of the first floating blade and the first drainage hole 4201 of the second floating blade is smaller than the connection area between the pilot-stage valve core second drainage groove 2803 and the first floating blade second drainage hole 4204 and the second floating blade second drainage hole 4203. At this time, the third pilot fluid chamber 30 and the fourth pilot fluid chamber 31 are low-pressure oil chambers, and the first pilot fluid chamber 28 and the second pilot fluid chamber 29 are high-pressure oil chambers. Therefore, the first floating blade 2701 and the second floating blade 2702 drive the power-stage ball valve core 16 to rotate clockwise through the transmission pin 32 under the pressure difference between the high-pressure fluid medium and the low-pressure fluid medium in the pilot fluid chamber.

[0080] The power output process of the power stage valve core is as follows: under the drive of the pilot stage valve core 21, the second hydraulic oil enters the second distribution groove 1604 from the P port pipe joint 15 and then outputs to the B port pipe joint 2A to realize the circulation of PB; at the same time, the third hydraulic oil flows in from the A port pipe joint 25, flows out to the T port pipe joint 23 through the first distribution groove 1601, and realizes the circulation of AT. According to the example analysis, 0°-5° is the first step flow adjustment range, and this angle range can realize the stepless control output of 0-100L / min flow, 5°-7° is the first step stable flow angle range, and this angle range can realize the stable output of 100L / min flow, 7°-16° is the first step flow adjustment angle range, and this angle range can realize 100-300 L / min flow rate can be infinitely regulated and outputted, 16°-18° is the first step stable flow angle range, this angle range can achieve a stable output of 300L / min flow rate, 18°-36° is the first step flow adjustment angle range, this angle range can achieve a stepless regulation and output of 300-600L / min flow rate, 36°-38° is the first step stable flow angle range, this angle range can achieve a stable output of 600L / min flow rate, and realize the grading and constant flow distribution of spherical flow distribution. In the embodiment, at a rated pressure difference of 4MPa and emulsion medium, the stable flow rates are 100, 300, and 600L / min respectively, wherein there is a response error of ±1°, and a constant flow output can still be achieved, meeting the needs of multi-stage constant and precise flow output.

[0081] The angle following overshoot correction process is as follows: when the overshoot of the power stage ball valve rotation angle is greater than the pilot stage valve core 28 rotation angle, the reverse angle difference generated causes the first drainage groove 2802 of the pilot stage valve core to rotate to a connection area with the first drainage hole 4202 of the first floating blade and the first drainage hole 4201 of the second floating blade that is larger than the connection area between the second drainage groove 2803 of the pilot stage valve core and the second drainage hole 4204 of the first floating blade and the second drainage hole 4203 of the second floating blade. At this time, the third pilot fluid chamber 30 and the fourth pilot fluid chamber 31 are connected. The guide fluid chamber 31 is a high-pressure oil chamber, and the first pilot fluid chamber 28 and the second pilot fluid chamber 29 are low-pressure oil chambers. Therefore, under the action of the pressure difference between the high-pressure fluid medium and the low-pressure fluid medium in the pilot fluid chamber, the first floating blade 3701 and the second floating blade 3702 drive the power-stage ball valve core to rotate counterclockwise through the floating blade locating pin 17 and the boss of the pilot-stage copper sleeve 6, thereby correcting the overshoot angle; through the joint action of the above-mentioned response and overshoot correction links, the feedback and following of the rotation angle of the ball valve and the pilot valve core are completed.

[0082] In summary, the above control method can realize accurate mechanical position feedback of the present invention. When the input command rotates ±α°, the power stage ball valve core 16 can be synchronously rotated with the pilot stage valve core 21, thereby realizing the control of the rotation angle signal of the driving motor to control the opening control of the rotary valve core, and realizing the mechanical rotation angle closed-loop control of the ball valve.

[0083] Compared with the prior art, the rotary large-flow electro-hydraulic ball valve and its control method proposed in the present invention have significant beneficial effects. First, the present invention adopts a modular design, sequentially superimposing a drive component, a pilot stage component, a power stage component and a distribution valve body component, using a ball valve core structure to achieve spherical distribution, and by setting two distribution grooves with three levels of different gradient areas to achieve graded and constant value distribution. This design not only reduces the difficulty of processing the valve body, but also improves the response speed and feedback accuracy, so that the electro-hydraulic ball valve can be used in higher pressure and larger variable flow occasions. Secondly, the power stage ball valve core assembly adopts a single-turn valve to realize the function of a three-position four-way reversing valve, and adopts a double-cycle symmetrical design and a spherical support sealing method, and provides sealing wear compensation through a spherical spring clamping screw 8. This design can not only improve the stress state of the valve core, reduce vibration, and improve stability, but also effectively prevent fluid medium leakage and ensure good sealing performance. In addition, the present invention proposes for the first time a control method for the power-level ball valve core to follow the rotation angle of the pilot-level valve core 28, effectively solving the problem of large friction torque caused by spherical support, and proposes a control correction method. When the rotation angle of the power-level valve core is too large, the high-pressure and low-pressure oil chamber positions of the pilot fluid chamber can be adjusted to achieve automatic correction of the main valve core rotation angle, thereby ensuring high-precision rotation angle following control. Finally, the present invention has a simple structure, small size, wide application range, high innovation and promotion value, and shows broad market application prospects.

[0084] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "mode", "specific mode", or "some modes" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or mode are included in at least one embodiment or mode of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or mode. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or modes in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or modes described in this specification and the features of the different embodiments or modes, without contradiction.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An electro-hydraulic ball valve, characterized in that: It includes an integrated drive assembly, a pilot stage assembly, a power stage assembly, and a distribution valve body assembly; The drive assembly includes a drive motor for outputting a rotational motion; The power stage assembly comprises a motor end sphere and a flow distribution side sphere which are arranged opposite to each other, the spherical surface of the flow distribution side sphere is provided with a first flow distribution groove and a second flow distribution groove, and both the first flow distribution groove and the second flow distribution groove are arc-shaped groove structures with three-level gradients and different areas; The distribution valve body assembly includes a joint end cover, and the joint end cover is provided with a P-port pipe joint, a T-port pipe joint, an A-port pipe joint, and a B-port pipe joint; Among them, the driving component drives the motor end ball and the distribution side ball to rotate through the pilot stage component to switch the connection status of the first distribution groove and the second distribution groove relative to the P-port pipe joint, the T-port pipe joint, the A-port pipe joint, and the B-port pipe joint.

2. The electro-hydraulic ball valve according to claim 1, characterized in that: The pilot stage assembly includes a pilot stage valve core, a pilot stage copper sleeve, two floating blades arranged opposite to each other, and two fixed blades arranged opposite to each other, and the distribution valve body assembly includes an external pipe joint; The driving motor is in driving cooperation with the pilot stage valve core, the pilot stage copper sleeve is coaxially arranged with the pilot stage valve core, the floating blade and the fixed blade are arranged between the pilot stage copper sleeve and the pilot stage valve core to separate four pilot fluid chambers surrounding the pilot stage valve core, the fixed blade is fixed relative to the valve body, the floating blade is fixed to the pilot stage copper sleeve, and the pilot stage copper sleeve is positioned and cooperated with the motor end ball and the distribution side ball; The pilot pressure oil is introduced into the pilot stage valve core through the external pipe joint, so that the pressure difference between the pilot fluid chambers acts on the floating blade by switching the connection state between the pilot stage valve core and the pilot fluid chamber during the rotation process, so as to drive the pilot stage copper sleeve to drive the motor end ball and the distribution side ball to rotate.

3. The electro-hydraulic ball valve according to claim 2, characterized in that: The pilot stage valve core is provided with a central hole, a first drainage groove and a second drainage groove, one end of the central hole is connected to the external pipe joint, and the first drainage groove and the second drainage groove are radially connected to the central hole; The floating vane is provided with a first drainage hole and a second drainage hole, the axial positions of which correspond to the first drainage groove and the second drainage groove respectively, one end of the first drainage hole faces the pilot stage valve core, and the other end faces the pilot fluid cavity on one side of the floating vane, and one end of the second drainage hole faces the pilot stage valve core, and the other end faces the pilot fluid cavity on the other side of the floating vane; During the rotation of the pilot stage valve core, the flow area between the first drainage hole and the first drainage groove is inversely proportional to the flow area between the second drainage hole and the second drainage groove.

4. The electro-hydraulic ball valve according to claim 3, characterized in that: The pilot stage valve core is provided with a limiting groove, and the limiting groove is a long hole or groove whose length direction is perpendicular to the axis of the pilot stage valve core; The floating blade is provided with a limiting column matched with the limiting groove to limit the rotation angle range of the floating blade relative to the pilot stage valve core; Within the rotation angle range, the first drainage hole is always connected to the first drainage groove, and the second drainage hole is always connected to the second drainage groove.

5. The electro-hydraulic ball valve according to any one of claims 1 to 4, characterized in that: It comprises an outer shell and a motor end cover, wherein the motor end cover and the joint end cover are respectively sealed and matched at two ends of the outer shell, and the pilot stage component and the power stage component are both located in a sealing structure between the outer shell, the motor end cover and the joint end cover; The driving assembly comprises a motor junction box arranged on the outside of the motor end cover, and a motor mounting bracket arranged on the inside of the motor end cover, and the driving motor is mounted on the motor mounting bracket.

6. The electro-hydraulic ball valve according to claim 5, characterized in that: A motor-end copper sleeve is provided between the motor-end ball and the motor end cover, and a flow-distribution-side copper sleeve is provided between the flow-distribution-side ball and the joint end cover; The inner sides of the motor end copper sleeve and the distribution side copper sleeve both have a concave spherical support structure, and the distribution side copper sleeve is provided with through holes corresponding to the P port pipe joint, the T port pipe joint, the A port pipe joint, and the B port pipe joint respectively; The motor end ball and the flow distribution side ball are spaced apart to form a pressure relief chamber therebetween. The outer shell is provided with a leakage pipe joint at a position corresponding to the pressure relief chamber.

7. The electro-hydraulic ball valve according to claim 6, characterized in that: A spherical spring compression screw is provided on one side of the motor end cover facing the motor end copper sleeve; Under the elastic force support force of the spherical spring compression screw, there is a wear compensation gap between the motor end cover and the motor end copper sleeve.

8. The electro-hydraulic ball valve according to claim 5, characterized in that: The pilot stage assembly includes a motor-side pilot stage end cover and a connector-side pilot stage end cover; The two ends of the pilot stage valve core are respectively rotatably matched with the motor end pilot stage end cover and the joint side pilot stage end cover; The motor-end pilot stage end cover is fixed to the motor end cover, the joint-side pilot stage end cover is fixed to the joint end cover, and a spline passing through the motor-end pilot stage end cover is provided at one end of the pilot stage valve core facing the drive motor, and the pilot stage valve core is connected to the drive shaft of the drive motor through the spline.

9. A control method for an electro-hydraulic ball valve, characterized in that: Used to control the electro-hydraulic ball valve according to any one of claims 1 to 8; Methods include: Input control instructions; According to the control instruction, the drive motor is controlled to output a counterclockwise rotation action or a clockwise rotation action to realize the on-off combination of the pressure oil port P, the pressure oil port T, the hydraulic oil port A, and the hydraulic oil port B; The on-off combination includes a first combination of P and A being connected and B and T being connected, and a second combination of P and B being connected and A and T being connected.

10. The control method of the electro-hydraulic ball valve according to claim 9, characterized in that: The electro-hydraulic ball valve has an initial state, in which the initial angle is 0°, and the pressure oil port P, the pressure oil port T, the hydraulic oil port A, and the hydraulic oil port B are all disconnected; The control instruction includes a target rotation angle based on the initial angle; The step of controlling the drive motor to output a counterclockwise rotation action or a clockwise rotation action according to the control instruction comprises: The driving motor is controlled according to the control instruction to output a rotation action of the target rotation angle.

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