A multi-dimensional discrete micro high-speed switching valve and its working method

Abstract

The present invention discloses a multi-dimensional discrete micro-miniature high-speed on-off valve, comprising: a valve body comprising a first end cap and a second end cap disposed opposite each other, a magnetic yoke connected between the first and second end caps; a valve port within the first end cap, a ball valve core disposed on the side of the valve port facing away from the second end cap to seal the valve port; a push rod disposed within the valve body, the end of the push rod contacting the end of the ball valve core facing the second end cap, and an armature sleeved on the push rod; multiple coil assemblies disposed between the armature and the valve body, each coil assembly comprising an independently controllable axial coil and at least one radial coil, wherein the radial coil within the same coil assembly is located on the side of the axial coil facing away from the armature; when any coil assembly is energized, the armature drives the push rod to push the ball valve core toward or away from the valve port, thereby opening or closing the valve port. Also disclosed is an electrical excitation method for using the above-described on-off valve. The on-off valve has the advantages of high dynamic performance, small axial dimensions, high control accuracy, and a high degree of intelligence.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic technology, and in particular to a multi-dimensional discrete micro high-speed switching valve and a working method thereof. Background Art

[0002] Electro-hydraulic servovalves, with their advantages of fast response, high output power, and high control precision, are widely used in high-end industrial equipment such as aerospace, robotics, rolling mills, and injection molding machines. However, due to the inherent structural characteristics of slide valves, electro-hydraulic proportional / servovalves suffer from low reliability, high energy consumption, low intelligence, and high cost, further limiting the application and development of electro-hydraulic proportional / servo control technology. Compared with traditional proportional / servovalves, high-speed on-off valves are directly driven by digital signals and operate only in the fully open or fully closed state. Therefore, they offer advantages such as low throttling losses and strong resistance to oil contamination. With the rapid development of computer technology and digital drive technology, the switching frequency of high-speed on-off valves has been further increased, and with it, flow control accuracy. This has led to their application in aerospace engines, construction machinery, and automotive brakes.

[0003] According to the different driving modes, high-speed on-off valves can be divided into two categories: electromagnetic drive and intelligent material drive. Compared with the intelligent material drive mode, electromagnetic drive high-speed on-off valves have the advantages of large output displacement and low cost, and have become a research hotspot for relevant scholars at home and abroad. However, for the existing electromagnetic drive high-speed on-off valves, there are still the following problems that need to be solved: (1) Due to the restriction of large inductance of single coil, the opening and closing speed of valve core is difficult to be further improved, resulting in poor dynamic response capability of high-speed on-off valve; (2) Since electromagnetic drive high-speed on-off valves adopt the design concept of hydraulic and electromagnetic structure separation, this will lead to an increase in the axial size of high-speed on-off valves; (3) Since the key parameters of electromagnetic drive high-speed on-off valves such as magnetic induction intensity and valve core displacement cannot be directly measured, it is difficult to realize online monitoring and fault diagnosis of key parameters, resulting in great difficulty in improving the intelligence level of high-speed on-off valves. Summary of the Invention

[0004] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a multi-dimensional discrete micro-sized high-speed switching valve and its working method. It adopts an axial radial discrete coil and a hollow armature structure scheme, which can effectively reduce the axial size of the high-speed switching valve while maintaining its dynamic performance, and uses the induction magnetic field testing technology to calculate the displacement of the ball valve core in real time to realize online monitoring and fault diagnosis of key parameters of the high-speed switching valve.

[0005] To achieve the above objectives, the present invention provides a multi-dimensional discrete micro-miniature high-speed switching valve, comprising a valve body, the valve body comprising a first end cover and a second end cover disposed opposite each other, a magnetic yoke connected between the first end cover and the second end cover; a valve port is defined within the first end cover, and a ball valve core is provided on the side of the valve port facing away from the second end cover to seal the valve port;

[0006] a push rod disposed in the valve body, the end of the push rod being in contact with one end of the ball valve core facing the second end cover, and an armature sleeved on the push rod;

[0007] A plurality of coil assemblies are also provided between the armature and the valve body, each of the coil assemblies including an axial coil and at least one radial coil that can be controlled individually, and in the same coil assembly, the radial coil is located on the side of the axial coil facing away from the armature; when any coil is energized, the armature can drive the push rod to push the ball valve core toward or away from the valve port to open or close the valve port.

[0008] Furthermore, each of the coil assemblies includes an axial coil and a radial coil.

[0009] Furthermore, the plurality of coil assemblies are arranged along the axial direction of the push rod.

[0010] Furthermore, it includes three coil assemblies.

[0011] Furthermore, a hollow flow channel is provided in the push rod, a cover plate is provided at one end of the push rod, a top rod in contact with the ball valve assembly and a plurality of through holes connected to the hollow flow channel are provided on the cover plate, and the other end of the push rod is provided with an opening opposite to the oil outlet on the second end cover.

[0012] Furthermore, a pole shoe is provided on the outer side of the push rod, and in the axial direction of the push rod, the pole shoe is located between the armature and the first end cover.

[0013] Furthermore, a guide sleeve is provided on the outside of the armature, one end of the guide sleeve is sleeved on the guide sleeve located in the second end cover, and the other end of the guide sleeve extends to the outside of the pole shoe; a magnetic isolation ring is provided between the armature and the pole shoe, and the magnetic isolation ring is welded to the guide sleeve.

[0014] Furthermore, it also includes a ball valve assembly, which includes a base arranged in the first end cover, a spring sleeved on the base, and a ball valve core connected to the end of the spring facing away from the base. A mating surface is provided at the valve port, and the surface of the ball valve core can fit with the mating surface in the first end cover to close the valve port in the first end cover. A plurality of oil inlet holes are provided on the base.

[0015] Furthermore, the magnetic yoke includes a first magnetic yoke and a second magnetic yoke arranged along the axial direction of the push rod, and the first magnetic yoke and the second magnetic yoke are connected by bolts.

[0016] The working principle of the multi-dimensional discrete micro-high-speed switching valve of the present invention is as follows:

[0017] In the initial state, all coils are de-energized. Under the action of the spring, the ball valve core fits tightly with the mating surface of the first end cover to ensure that the valve port is completely closed. At this time, the high-speed switching valve does not output flow. In the working state, a coil is energized to generate a magnetic field. Under the action of the magnetic field, the armature drives the push rod, pushing the ball valve core away from the valve port, so that the oil passes through the valve port into the hollow flow channel of the push rod and finally flows out from the oil outlet. At this time, the high-speed switching valve outputs flow.

[0018] The present invention also discloses an electrical excitation method for a multi-dimensional discrete micro-sized high-speed switching valve. The control method is used for closed-loop control of the displacement of a ball valve core and includes the following steps:

[0019] The multiple radial coils are energized separately to make the armature move under the action of the magnetic field;

[0020] The movement of the armature cuts the magnetic induction line to generate an induced current. Multiple axial coils detect the induced current in real time and calculate the movement displacement of the armature.

[0021] The calculated motion displacement is compared with the command motion displacement, and the real-time control voltage is calculated by the PID controller;

[0022] The closed-loop control of the ball valve core displacement is achieved by exciting multiple radial coils with control voltage.

[0023] Furthermore, the following working modes are also included:

[0024] Mode 1, namely ultra-high frequency electric excitation mode:

[0025] In this mode, multiple radial coils and axial coils are energized separately. Compared with the traditional single-coil drive mode, the coil inductance in this mode is the smallest, and the coil current rises and falls the fastest, so the ball valve core opens and closes the fastest.

[0026] Mode 2, high-frequency electrical excitation mode:

[0027] In this mode, only multiple axial coils are energized individually. Compared with mode 1, the magnetic flux and magnetic induction intensity generated in this mode are smaller, so the rising and falling speeds of the coil current are slower than in mode 1, and the opening and closing dynamic performance of the ball valve core is weaker than in mode 1.

[0028] Mode 3, low-frequency electric excitation mode:

[0029] In this mode, only multiple radial coils are energized individually; since the total length of the radial coils is greater than that of the axial coils, the inductance of the radial coils is greater than that of the axial coils; therefore, in this mode, the rise and fall speeds of the coil current are slower than in mode 2, and the opening and closing dynamic performance of the ball valve core is weaker than in mode 2.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) Discrete the coil in the axial and radial dimensions, which not only solves the hysteresis problem caused by the coil inductance, but also realizes the online monitoring and fault diagnosis of high-speed switching valves with the help of axial coil induction magnetic field testing technology, thus improving its intelligence level.

[0032] (2) The armature and push rod adopt a hollow structure, which can effectively reduce the moving mass. In addition, the center hole of the push rod is used as a flow channel, which further reduces the axial size of the high-speed switching valve;

[0033] (3) By integrating the axial coil induction magnetic field testing technology and the PID closed-loop control technology, the excitation voltage of the radial coil is adjusted in real time, and finally the closed-loop control of the movement displacement of the ball valve core is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 A two-dimensional cross-sectional view of a multi-dimensional discrete micro-sized high-speed switching valve according to an embodiment of the present invention;

[0035] Figure 2 A two-dimensional cross-sectional view of the first end cover in an embodiment of the present invention;

[0036] Figure 3 A two-dimensional cross-sectional view of a push rod in an embodiment of the present invention;

[0037] The figure marks of the above drawings are: 1. first end cover; 101. mating surface; 102. valve port; 103. annular groove; 104. first inner hole; 105. second inner hole; 2. ball valve core; 3. spring; 4. base; 5. sealing ring; 6. first magnetic yoke; 7. pole shoe; 8. push rod; 801. limit part; 9. armature; 10. guide sleeve; 11. magnetic isolation ring; 12. guide sleeve; 13. coil skeleton; 14. first axial coil; 15. first radial coil; 16. second axial coil; 17. second radial coil; 18. third axial coil; 19. third radial coil; 20. second magnetic yoke; 21. first bolt; 22. second end cover; 23. second bolt; P, oil inlet; A, oil outlet. DETAILED DESCRIPTION

[0038] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. These embodiments are implemented based on the technical solutions of the present invention. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0039] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "inside" and "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0040] like Figure 1-3 As shown, this embodiment discloses a multi-dimensional discrete micro-sized high-speed switching valve, including a valve body, the valve body including a first end cover 1 and a second end cover 22, and a magnetic yoke connected between the first end cover 1 and the second end cover 22; the first end cover 1 has a valve port 102, and the side of the valve port 102 facing away from the second end cover 22 is provided with a ball valve core 2 for blocking the valve port 102;

[0041] A push rod 8 is provided in the valve body, the end of the push rod 8 contacts the end of the ball valve core 2 facing the second end cover 22, and an armature 9 is sleeved on the push rod 8;

[0042] Multiple coil assemblies are positioned between the armature 9 and the valve body. Each coil assembly includes an independently controllable axial coil and at least one radial coil. The coils within a coil assembly are arranged radially relative to the push rod 8, with the radial coils located on the side of the axial coils facing away from the armature. When any coil is energized, the armature 9 drives the push rod 8 to push the ball valve core 2 toward or away from the valve port, thereby opening or closing the valve port 102.

[0043] The magnetic yoke includes a first magnetic yoke 6 and a second magnetic yoke 20 arranged along the axial direction of the push rod 8. The first magnetic yoke 6 is sleeved on the first end cover 1 with an interference fit. The first magnetic yoke 6 and the second magnetic yoke 20 are connected by a first bolt 21, and the second end cover 22 and the second magnetic yoke 20 are connected by a second bolt 23.

[0044] The first end cap 1 has a valve port 102. The side of the valve port 102 facing the second end cap 22 is connected to a first inner hole 104, and the side of the valve port 102 facing away from the second end cap 22 is connected to a second inner hole 105. A ball valve assembly is disposed within the second inner hole 105. The ball valve assembly includes a base 4 disposed within the second inner hole 105, which has an interference fit with the wall of the second inner hole 105 and is provided with multiple oil inlet holes P for oil to enter the valve body; a spring 3 sleeved on the base 4; and a ball valve core 2 connected to the end of the spring 3 facing away from the base 4. The surface of the ball valve core 2 is adapted to mate with the mating surface 101 of the valve port 102, thereby closing the valve port 102 within the first end cap 1 and completely isolating the first inner hole 104 from the second inner hole 105, ensuring that the valve port 102 is leak-free in the initial state.

[0045] An annular groove 103 is further provided on the end surface of the first end cover 1 facing away from the second end cover 22 , and a sealing ring 5 is provided in the annular groove 103 .

[0046] The push rod 8 has a hollow flow channel formed therein. A cover plate is provided at one end of the push rod 8. The cover plate is provided with a push rod that contacts the ball valve core and a plurality of through holes communicating with the hollow flow channel. The other end of the push rod 8 has an opening that is opposite to the oil outlet A on the second end cover 22. The push rod 8 is used to transmit the displacement of the armature 9 to the ball valve core 2.

[0047] An armature 9 and a pole shoe 7 are provided on the outside of the push rod 8. The pole shoe 7 is located between the armature 9 and the first end cover 1. The armature 9 and the push rod 8 have an interference fit. The surface of the push rod 8 is provided with a raised limiting portion 801. The limiting portion 801 abuts against the end face of the armature 9 facing away from the pole shoe 7, and is used to limit the axial position of the armature 9. A guide sleeve 10 is provided on the outside of the armature 9. One end of the guide sleeve 10 is sleeved on the guide sleeve 12 located in the second end cover 22, and the other end of the guide sleeve 10 extends to the outside of the pole shoe 7. A magnetic isolation ring 11 is provided between the armature 9 and the pole shoe 7. The magnetic isolation ring 11 is welded to the guide sleeve 10 and is used to reduce the main air gap magnetic leakage.

[0048] The pole shoe 7 and the outer side of the guide sleeve 10 are connected to the coil skeleton 13, and the coil skeleton 13 is sequentially arranged with a first annular groove, a second annular groove and a third annular groove along the axial direction of the push rod 8, from the second end cover 22 to the second end cover 22. Preferably, an axial coil and a radial coil are provided in each annular groove. Specifically, a first axial coil 14 and a first radial coil 15 are wound in the first annular groove, a second axial coil 16 and a second radial coil 17 are wound in the second annular groove, and a third axial coil 18 and a third radial coil 19 are wound in the third annular groove. Each of the axial coils and radial coils can be controlled separately. The axial coil and the radial coil generate perpendicular magnetic fields, wherein the radial coil is located on the side of the axial coil facing away from the armature 9.

[0049] The guide sleeve is in the same axial direction as the armature, the push rod, the ball valve core and the spring to ensure that all moving parts will not get stuck.

[0050] In the initial state, all coils are not energized. Under the action of the spring 3, the ball valve core 2 fits tightly with the mating surface 101 of the first end cover 1, ensuring that the valve port 102 is completely closed. At this time, the high-speed switching valve does not output flow; in the working state, a certain coil is energized to generate a magnetic field. Under the action of the magnetic field, the armature 9 drives the push rod 8, pushing the ball valve core 2 to squeeze the spring 3 to leave the valve port 102, so that the oil passes through the gap between the ball valve core 2 and the valve port 102 into the hollow flow channel of the push rod 8, and finally flows out from the oil outlet A. At this time, the high-speed switching valve outputs flow.

[0051] Preferably, this embodiment discloses an electric excitation control method for a multi-dimensional discrete micro-sized high-speed switching valve, which is used for closed-loop control of the displacement of the ball valve core 2 and includes the following steps:

[0052] The radial coils are energized separately to make the armature 9 move under the action of the magnetic field;

[0053] When the armature 9 moves to cut the magnetic induction line and generate an induced current, the multiple axial coils detect the induced current in real time and calculate the movement displacement of the armature 9;

[0054] The calculated motion displacement is compared with the command motion displacement, and the real-time control voltage is calculated by the PID controller;

[0055] The multiple radial coils are excited by the control voltage to achieve closed-loop control of the displacement of the ball valve core 2.

[0056] Furthermore, it also has the following working modes:

[0057] Mode 1, namely ultra-high frequency electric excitation mode:

[0058] In this mode, the first axial coil 14, the first radial coil 15, the second axial coil 16, the second radial coil 17, the third axial coil 18, and the third radial coil 19 are all energized separately; compared with the traditional single-coil drive mode, the coil inductance in this mode is the smallest, and the coil current rises and falls at the fastest speed, so the opening and closing speed of the ball valve core 2 is the fastest.

[0059] Mode 2, high-frequency electrical excitation mode:

[0060] In this mode, only the first axial coil 14, the second axial coil 16, and the third axial coil 18 are energized. Compared with mode 1, the magnetic flux and magnetic induction intensity generated in this mode are smaller, so the rising and falling speeds of the coil current are slower than in mode 1, and the opening and closing dynamic performance of the ball valve core 2 is weaker than in mode 1.

[0061] Mode three is the low-frequency electrical excitation mode.

[0062] In this mode, only the first radial coil 15, the second radial coil 17, and the third radial coil 19 are energized separately. Since the total length of the radial coils is greater than that of the axial coils, the inductance of the radial coils is greater than that of the axial coils. Therefore, in this mode, the rising and falling speeds of the coil current are slower than those in mode 2, and the opening and closing dynamic performance of the ball valve core 2 is weaker than that in mode 2.

[0063] As can be seen from the above, the working method proposed in the present invention can calculate the valve core displacement in real time according to the induced current of the axial coil, and then control the flow output, which significantly improves the working efficiency and control accuracy.

[0064] While the present invention has been disclosed above with reference to preferred embodiments, this is not intended to limit the present invention. Persons skilled in the art will readily appreciate that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. A multi-dimensional discrete micro high-speed switching valve, characterized in that: include: A valve body, the valve body comprising a first end cover and a second end cover arranged opposite to each other, a magnetic yoke connected between the first end cover and the second end cover; a valve port is provided in the first end cover, and a ball valve core is provided on the side of the valve port facing away from the second end cover to block the valve port; a push rod disposed in the valve body, the end of the push rod being in contact with one end of the ball valve core facing the second end cover, and an armature sleeved on the push rod; A plurality of coil assemblies are provided between the armature and the valve body. Each coil assembly includes an independently controllable axial coil and at least one radial coil. Within the same coil assembly, the radial coil is located on the side of the axial coil facing away from the armature. When any coil is energized, the armature can drive the push rod to push the ball valve core toward or away from the valve port, thereby opening or closing the valve port. A ball valve assembly, comprising a base disposed in the first end cover, a spring sleeved on the base, and a ball valve core connected to an end of the spring facing away from the base; a mating surface is provided at the valve port, and the surface of the ball valve core can be in contact with the mating surface in the first end cover to close the valve port in the first end cover; and a plurality of oil inlet holes are provided on the base; A hollow flow channel is provided in the push rod, a cover plate is provided at one end of the push rod, a push rod in contact with the ball valve assembly and a plurality of through holes connected to the hollow flow channel are provided on the cover plate, and an opening is provided at the other end of the push rod opposite to the oil outlet on the second end cover; A pole shoe is further provided on the outer side of the push rod, and in the axial direction of the push rod, the pole shoe is located between the armature and the first end cover; A guide sleeve is provided on the outside of the armature, one end of the guide sleeve is sleeved on the guide sleeve located in the second end cover, and the other end of the guide sleeve extends to the outside of the pole shoe. A magnetic isolation ring is provided between the armature and the pole shoe, and the magnetic isolation ring is welded to the guide sleeve.

2. The multi-dimensional discrete micro-sized high-speed switching valve according to claim 1, characterized in that: Each coil assembly includes an axial coil and a radial coil.

3. The multi-dimensional discrete micro-sized high-speed switching valve according to claim 1, characterized in that: The plurality of coil assemblies are arranged along the axial direction of the push rod.

4. The multi-dimensional discrete micro-sized high-speed switching valve according to claim 1, characterized in that: The coil assembly comprises three of the coil assemblies.

5. The multi-dimensional discrete micro-sized high-speed switching valve according to claim 1, characterized in that: The magnetic yoke includes a first magnetic yoke and a second magnetic yoke arranged along the axial direction of the push rod, and the first magnetic yoke and the second magnetic yoke are connected by bolts.

6. An electric excitation method using the multi-dimensional discrete micro-miniature high-speed switching valve according to claim 1, wherein the method is used for closed-loop control of the displacement of the ball valve core, characterized in that: The method comprises the following steps: energizing a plurality of radial coils respectively to cause the armature to move under the action of a magnetic field; The movement of the armature cuts the magnetic induction line to generate an induced current. Multiple axial coils detect the induced current in real time and calculate the movement displacement of the armature. The calculated motion displacement is compared with the command motion displacement, and the real-time control voltage is calculated by the PID controller; The closed-loop control of the ball valve core displacement is achieved by exciting multiple radial coils with control voltage.

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