Low-power Micro High-speed On-off Valve and Its Usage Method

Abstract

The present invention relates to a low-power micro high-speed switching valve and its usage method, which includes a valve body mechanism, an electromagnetic mechanism and a valve core mechanism; the electromagnetic mechanism and the valve core mechanism are both arranged inside the valve body mechanism; the valve body mechanism includes a valve sleeve, a first valve cover, a second valve cover, a valve body, a valve seat, a first sealing ring, a second sealing ring, a guide sleeve and a limit fixing iron; the side surface of one end of the first valve cover is connected to the first end of the valve sleeve. Compared with other high-speed switching valves, the present invention has the advantages of low power consumption, small volume, and the ability to actively control the valve opening and closing process, etc.

Description

Technical Field:

[0001] The present invention relates to the field of high-speed on-off valves, and particularly to a low-power micro high-speed on-off valve and its usage method. Background Art:

[0002] A high-speed on-off valve is a hydraulic control component that uses electromagnetic control to open and close an oil circuit. As a key component of electro-hydraulic digital control technology, the electromagnetic on-off valve has the advantages of miniaturization, fast response, and simple structure, and is widely promoted and applied in the field of digital hydraulic engineering technology.

[0003] For a traditional high-speed on-off valve, the opening or closing of the valve core is usually controlled by the on-off current of a coil. When the valve core is in the open or closed state, it is necessary to continuously supply power to the coil to keep the armature with the corresponding electromagnetic force. When the high-speed on-off valve works for a long time, it needs to be energized for a long time, resulting in serious heating of the internal components of the high-speed on-off valve, and there are risks such as coil fusing. This will not only reduce the performance of the high-speed on-off valve, but also shorten the service life of each component of the on-off valve.

[0004] At the same time, a traditional high-speed on-off valve usually cuts off the power when it is closed, and only uses the spring force to close the valve, so that the valve cannot be actively controlled during the closing process, which limits the performance of the high-speed on-off valve. The existence of the above problems limits the widespread application of high-speed on-off valves in industry, and is an urgent problem to be solved in this field. Summary of the Invention:

[0005] Aiming at the deficiencies of the prior art, the present invention provides a low-power micro high-speed on-off valve and its usage method, which solves the problem of a large amount of heat generation when the high-speed on-off valve is kept open or closed by setting a valve body mechanism, an electromagnetic mechanism and a valve core mechanism, and at the same time enables the valve core to be actively controlled when opening and closing.

[0006] To achieve the above object, the present invention discloses the following technical solutions:

[0007] A low-power micro high-speed switching valve, which comprises a valve body mechanism, an electromagnetic mechanism and a valve core mechanism; the electromagnetic mechanism and the valve core mechanism are both arranged inside the valve body mechanism; the valve body mechanism includes a valve sleeve, a first valve cover, a second valve cover, a valve body, a valve seat, a first sealing ring, a second sealing ring, a guide sleeve and a limit fixing iron; the side surface of one end of the first valve cover is connected to the first end of the valve sleeve, the second end of the valve sleeve is connected to the first end of the valve body, and the side wall of the second end of the valve body is connected to one end of the second valve cover; the valve seat is arranged inside the connection between the valve body and the second valve cover, the lower end of the valve seat contacts the second valve cover, and the upper end of the valve seat contacts the valve core mechanism; the first sealing ring is arranged at the connection between the valve body and the second valve cover, and the second sealing ring is arranged at the connection between the valve seat and the second valve cover; the guide sleeve and the limit fixing iron are both arranged inside the electromagnetic mechanism; the electromagnetic mechanism includes a coil, a lead wire, a permanent magnet and an adjusting plug, and the side wall of the adjusting plug contacts the inner side wall of the first valve cover; the lower surface of the adjusting plug is connected to the upper surface of the permanent magnet, the lower surface of the permanent magnet contacts the upper surface of the limit fixing iron, and the lower surface of the limit fixing iron contacts the upper surface of the valve core mechanism; the inner side wall of the guide sleeve contacts the sliding contact surfaces of the limit fixing iron and the armature, the outer side wall of the guide sleeve contacts the inner side wall of the coil, and the outer side wall of the coil contacts the inner side wall of the valve sleeve; multiple lead wires are arranged on the coil; the valve core mechanism includes a spring, a valve core and an armature, the spring is sleeved on the side wall of the armature, the upper surface of the armature contacts the lower surface of the limit fixing iron, the upper end side wall of the armature is connected to the lower end inner side wall of the guide sleeve, the middle end side wall of the armature contacts the upper end inner side wall of the valve body, the lower end side wall of the armature contacts the inner side wall of the spring, the outer side wall of the spring contacts the inner side wall of the valve body, and the valve core is arranged inside the center of the lower end of the armature and contacts the upper surface of the valve seat.

[0008] Preferably, a first valve cover boss side is provided at the lower end of the first valve cover. The outer side wall of the first valve cover boss side contacts the inner side wall of the upper end of the valve sleeve. The first valve cover has a through structure and there is a first space. An internal hexagonal square hole, an adjusting plug mounting hole, and a permanent magnet cavity are sequentially arranged in the first space. The adjusting plug is arranged in the adjusting plug mounting hole, and the upper end of the permanent magnet contacts the permanent magnet cavity. A valve body side groove is provided on the side wall of the valve body. The side wall of the valve body is used to contact a first using device. A second valve cover mounting surface is provided at the bottom of the valve body. The second valve cover mounting surface contacts the inner side surface of the second valve cover. The valve body has a through structure and there is a second space. An armature mating surface, a spring cavity, an oil outlet, and a valve seat mounting surface are sequentially arranged in the second space. The armature mating surface is used to contact the middle end of the armature. The spring is arranged in the spring cavity. The oil outlets are arranged on both sides of the spring cavity and are through ports. The valve seat is arranged in the valve seat mounting surface.

[0009] Preferably, the side of the valve seat is provided with a valve seat upper boss side and a valve seat lower boss side. The valve seat lower boss side contacts the inner wall of the lower end of the valve seat. The center position of the upper surface of the valve seat is provided with a valve seat oil outlet chamfer. One end of the valve seat oil outlet chamfer contacts the valve core. The valve seat is of a through structure and has a third space. In the third space, a throttle port, a throttle cone surface, and a valve seat inlet port side are sequentially arranged. The upper end of the throttle port is connected to one end of the valve seat oil outlet chamfer. The lower end of the throttle port is connected to the upper end of the throttle cone surface. The lower end of the throttle cone surface is connected to the upper end of the valve seat inlet port side. The outer side wall of the second valve cover is provided with a second valve cover side groove, which can be connected to the using device. The second valve cover is of a through structure and has a fourth space. In the fourth space, a first seal ring installation groove, a valve body installation surface, a second seal ring installation groove, and an oil inlet are sequentially arranged. The first seal ring is arranged in the first seal ring installation groove. The second seal ring is arranged in the second seal ring installation groove. The valve body installation surface contacts the side wall of the lower end of the valve body. The lower end of the oil inlet is communicated with the second using device. The upper end of the oil inlet is communicated with the valve seat installation surface. The side wall of the armature is provided with a sliding contact surface and a plurality of radial flow holes. The upper end of the sliding contact surface can move on the inner side wall of the guide sleeve. The middle end of the sliding contact surface can move on the inner side wall of the upper end of the valve body. The lower end of the sliding contact surface can move on the inner side wall of the spring. The first ends of the plurality of radial flow holes contact the inner side wall of the spring. The second ends of the plurality of radial flow holes converge at one place and are communicated with the second end of the axial flow hole. The first end of the axial flow hole is arranged in the middle of the highest surface of the armature. The lower end of the armature is provided with a plurality of flow grooves and a plurality of armature lower bosses. The flow grooves and the armature lower bosses are arranged alternately and cooperate with the middle part of the valve body.

[0010] Preferably, an adjustable air gap is provided between the first valve cover and the permanent magnet.

[0011] Preferably, the first valve cover, the adjusting plug, the limiting iron, the valve sleeve, the armature, and the valve body are made of soft magnetic materials. The guide sleeve is made of stainless steel. The permanent magnet is made of a permanent magnetic material that can work at high temperatures.

[0012] Preferably, grooves are respectively provided on the outer surface of the valve body and the outer surface of the second valve cover for placing rubber seal rings.

[0013] The present invention also provides a using method of a low-power consumption micro high-speed switching valve, which includes the following steps:

[0014] S1. At the initial position, the armature does not move, the valve port is in the closed state, the oil inlet and the oil outlet are not connected, and at the same time, the limit fixed iron is magnetized by the permanent magnet;

[0015] S2. Turn on the external control power supply. The generated electrical signal is connected to the coil through the lead wire. A positive current +I passes through the coil. The magnetic field generated by the coil further magnetizes the limit fixed iron. The magnetic poles on the side of the armature close to the limit fixed iron after passing the positive current +I are of opposite polarity. The magnetic force lines generated by the magnetic field of the armature pass through the fixed iron. The electromagnetic force generated between the fixed iron and the armature is greater than the resistance. The resistance is the sum of the spring force and the hydrodynamic force. The armature quickly drives the valve core to open. The oil inlet and the oil outlet are connected. The working fluid medium flows in from the oil inlet, passes through the inner wall surfaces of the second valve cover and the valve seat respectively to reach the valve port position, and flows out from the oil outlet of the valve body;

[0016] S3. Turn off the external control power supply, disconnect the electrical signal of the lead wire, the coil is powered off, and the magnetic force lines of the magnetic field generated by the permanent magnet still pass through the fixed iron. The electromagnetic force generated between the fixed iron and the armature is greater than the resistance, so that the limit fixed iron and the armature are adsorbed together, and the armature and the valve core remain in the open state; the oil inlet and the oil outlet are connected. The working fluid medium flows in from the oil inlet, passes through the side of the inflow port of the valve seat, the throttling conical surface, the throttling port of the valve seat, reaches the valve port position, and flows out from the oil outlet;

[0017] S4. Turn on the external control power supply, make the electrical signal pass through the lead wire and be connected to the coil. At this time, a reverse current -I is passed through the coil. The coil generates a reverse magnetic field to cancel the magnetic field generated after the magnetization of the permanent magnet and the limit fixed iron. The magnetic poles on the side of the armature close to the limit fixed iron after passing the positive current +I are of the same polarity. The limit fixed iron and the armature repel each other. The electromagnetic force generated between the limit fixed iron and the armature is less than the resistance. The armature drives the valve core to quickly close. The oil inlet and the oil outlet are disconnected, and the working fluid medium cannot pass through this valve body;

[0018] S5. Turn off the external control power supply again, the electrical signal is disconnected, the coil is powered off. At the valve core closing position before the control power supply is turned off, the electromagnetic force generated between the limit fixed iron and the armature is less than the spring resistance, and the armature remains in the closed state. The oil inlet and the oil outlet are not connected, and the working fluid medium cannot pass through this valve body;

[0019] S6. Repeat the above steps S1 - S5, and the continuous opening / closing and maintaining the opening / closing state of the electromagnetic switch valve can be repeated; in addition, using a hex wrench to cooperate with the inner hexagonal square hole on the adjusting plug can adjust the position of the permanent magnet in the valve, and further adjust the magnetic field and electromagnetic force generated by the permanent magnet.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. Compared with other high-speed switching valves, the low-power miniature high-speed switching valve of the present invention has the advantages of low power consumption, small size, and active control of the valve opening and closing process.

[0022] 2. Through the coordinated use and structural design of the coil, permanent magnet, and armature, the present invention enables the valve core to open and close when the coil is energized with positive and negative currents. When the coil is de-energized, the valve core remains in its original open or closed state. This reduces energy loss at the source and effectively prevents severe heating of components during operation. Furthermore, the coordinated operation of the permanent magnet and coil allows the high-speed on-off valve to be subjected to a controllable electromagnetic force when closing, achieving controllability of the valve core closing process and increasing the controllable range of the valve during use.

[0023] 3. The present invention adopts a split structure. By separating the valve body and electromagnetic mechanism, the electromagnetic components are protected from contamination and corrosion by the working medium, and the permanent magnets are also protected from impact, which can reduce their lifespan. This also facilitates valve production and assembly. The electromagnetic force generated during operation can be adjusted by adjusting the adjustable air gap to meet various operating requirements. Description of the drawings:

[0024] Figure 1a This is a cross-sectional view of the overall structure of a low-power miniature high-speed switching valve of the present invention;

[0025] Figure 1b This is a schematic diagram of the overall structure of a low-power miniature high-speed switching valve of the present invention;

[0026] Figure 2a This is a schematic diagram of the overall structure of a first valve cover of a low-power miniature high-speed switching valve of the present invention;

[0027] Figure 2b This is a cross-sectional view of a first valve cover of a low-power miniature high-speed switching valve of the present invention;

[0028] Figure 3a This is a schematic diagram of the overall structure of a valve body of a low-power miniature high-speed switching valve of the present invention;

[0029] Figure 3b This is a cross-sectional view of a valve body of a low-power miniature high-speed switching valve of the present invention;

[0030] Figure 4a This is a schematic diagram of the overall structure of a valve seat of a low-power miniature high-speed switching valve of the present invention;

[0031] Figure 4b This is a cross-sectional view of a valve seat of a low-power miniature high-speed switching valve according to the present invention;

[0032] Figure 5a This is a schematic diagram of the overall structure of a second valve cover of a low-power miniature high-speed switching valve of the present invention;

[0033] Figure 5b Cross-sectional view of the second valve cover of a low-power micro high-speed switching valve according to the present invention;

[0034] Figure 6a Schematic diagram of the overall structure of the armature of a low-power micro high-speed switching valve according to the present invention;

[0035] Figure 6b Cross-sectional view of the armature of a low-power micro high-speed switching valve according to the present invention;

[0036] Figure 7a - Figure 7b Simulation curve of the electromagnetic force received by the armature under forward and reverse excitation of the low-power micro high-speed switching valve in the embodiment of the low-power micro high-speed switching valve of the present invention with respect to the spool displacement and the number of ampere-turns;

[0037] Figure 8a - Figure 8b Simulation curve of the electromagnetic force received by the armature with different air-gap lengths during the opening and closing processes of the low-power micro high-speed switching valve in the embodiment of the low-power micro high-speed switching valve of the present invention.

[0038] Some of the drawings in the drawings are described as follows: First valve cover 1, hexagon socket head cap 101, side of the first valve cover boss 102, adjusting plug mounting hole 103, permanent magnet cavity 104, valve sleeve 2, coil 3, valve body 4, side groove of the valve body 401, second valve cover mounting surface 402, armature mating surface 403, spring cavity 404, oil outlet 405, valve seat mounting surface 406, spring 5, valve seat 6, chamfer of the valve seat oil outlet 601, side of the upper boss of the valve seat 602, side of the lower boss of the valve seat 603, throttle port 604, throttle cone surface 605, side of the inlet port of the valve seat 606, first sealing ring 7, second valve cover 8, side groove of the second valve cover 801, first sealing ring mounting groove 802, valve body mounting surface 803, second sealing ring mounting groove 804, oil inlet 805, second sealing ring 9, spool 10, armature 11, sliding contact surface 1101, radial flow hole 1102, lower boss of the armature 1103, flow channel 1104, spool mounting hole 1105, axial flow hole 1106, lead wire 12, guide sleeve 13, limiting iron 14, permanent magnet 15, adjusting plug 16. Detailed implementation manners:

[0039] Hereinafter, exemplary embodiments, features, and aspects of the present invention will be described in detail with reference to the drawings. Identical reference numerals in the drawings denote elements having the same or similar functions. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0040] The present invention provides a low-power micro high-speed switching valve, as Figure 1a - Figure 1bAs shown in the figure, it includes a valve body mechanism, an electromagnetic mechanism, and a valve core mechanism; the electromagnetic mechanism and the valve core mechanism are both arranged inside the valve body mechanism.

[0041] As Figure 2a - Figure 5b shown: The valve body mechanism includes a valve sleeve 2, a first valve cover 1, a second valve cover 8, a valve body 4, a valve seat 6, a first sealing ring 7, a second sealing ring 9, a guide sleeve 13, and a limit fixing iron 14; the side surface at one end of the first valve cover 1 is connected to the first end of the valve sleeve 2, the second end of the valve sleeve 2 is connected to the first end of the valve body 4, and the side wall at the second end of the valve body 4 is connected to one end of the second valve cover 8.

[0042] As Figure 4a - Figure 4b shown: The valve seat 6 is arranged inside the connection between the valve body 4 and the second valve cover 8, the lower end of the valve seat 6 contacts the second valve cover 8, and the upper end of the valve seat 6 contacts the valve core mechanism; the first sealing ring 7 is arranged at the connection between the valve body 4 and the second valve cover 8, and the second sealing ring 9 is arranged at the connection between the valve seat 6 and the second valve cover 8; the guide sleeve 13 and the limit fixing iron 14 are both arranged inside the electromagnetic mechanism; the electromagnetic mechanism includes a coil 3, a lead wire 12, a permanent magnet 15, and an adjusting plug 16, the side wall of the adjusting plug 16 contacts the inner side wall of the first valve cover 1; the lower surface of the adjusting plug 16 is connected to the upper surface of the permanent magnet 15, the lower surface of the permanent magnet 15 contacts the upper surface of the limit fixing iron 14, and the lower surface of the limit fixing iron 14 contacts the upper surface of the valve core mechanism; the inner side wall of the guide sleeve 13 contacts the sliding contact surface 1101 of the limit fixing iron 14 and the armature 11, the outer side wall of the guide sleeve 13 contacts the inner side wall of the coil 3, and the outer side wall of the coil 3 contacts the inner side wall of the valve sleeve 2; a plurality of lead wires 12 are arranged on the coil 3.

[0043] As Figure 1a 、 Figure 6a and Figure 6b shown: The valve core mechanism includes a spring 5, a valve core 10, and an armature 11. The spring 5 is sleeved on the side wall of the armature 11. The upper surface of the armature 11 contacts the lower surface of the limit fixing iron 14. The upper end side wall of the armature 11 is connected to the lower end inner side wall of the guide sleeve 13. The middle end side wall of the armature 11 contacts the upper end inner side wall of the valve body 4. The lower end side wall of the armature 11 contacts the inner side wall of the spring 5. The outer side wall of the spring 5 contacts the inner side wall of the valve body 4. A valve core installation hole 1105 is arranged in the center inside the lower end of the armature 11. The valve core 10 is installed in the valve core installation hole 1105 and contacts the upper surface of the valve seat 6.

[0044] A first valve cover convex platform side 102 is provided at the lower end of the first valve cover 1. The outer side wall of the first valve cover convex platform side 102 is in contact with the inner side wall of the upper end of the valve sleeve 2. The first valve cover 1 has a through structure and there is a first space. An internal hexagonal square hole 101, an adjusting plug mounting hole 103, and a permanent magnet cavity 104 are sequentially arranged in the first space. The adjusting plug 16 is arranged in the adjusting plug mounting hole 103. The upper end of the permanent magnet 15 is in contact with the permanent magnet cavity 104. A valve body side groove 401 is provided on the side wall of the valve body 4. The side wall of the valve body 4 is used to contact a first using device. A second valve cover mounting surface 402 is provided at the bottom of the valve body 4. The second valve cover mounting surface 402 is in contact with the inner side surface of the second valve cover 8. The valve body 4 has a through structure and there is a second space. An armature mating surface 403, a spring cavity 404, an oil outlet 405, and a valve seat mounting surface 406 are sequentially arranged in the second space. The armature mating surface 403 is used to contact the middle end of the armature 11. The spring 5 is arranged in the spring cavity 404. The oil outlets 405 are arranged on both sides of the spring cavity 404 and are through ports. The valve seat 6 is arranged in the valve seat mounting surface 406.

[0045] On the side of the valve seat 6, there are the side surface of the upper boss 602 of the valve seat and the side surface of the lower boss 603 of the valve seat. The side surface of the lower boss 603 of the valve seat contacts the inner wall at the lower end of the valve seat 6. At the central position of the upper surface of the valve seat 6, there is a chamfer 601 for the oil outlet of the valve seat. One end of the chamfer 601 for the oil outlet of the valve seat contacts the valve core 10. The valve seat 6 is a through structure and has a third space. Inside the third space, there are successively arranged a throttle orifice 604, a throttle conical surface 605, and the side surface 606 of the inlet port of the valve seat. The upper end of the throttle orifice 604 is connected to one end of the chamfer 601 for the oil outlet of the valve seat. The lower end of the throttle orifice 604 is connected to the upper end of the throttle conical surface 605. The lower end of the throttle conical surface 605 is connected to the upper end of the side surface 606 of the inlet port of the valve seat; on the outer side wall of the second valve cover 8, there is a side groove 801 of the second valve cover, and the side groove 801 of the second valve cover can be connected to the using device. The second valve cover 8 is a through structure and has a fourth space. Inside the fourth space, there are successively arranged a first sealing ring installation groove 802, a valve body installation surface 803, a second sealing ring installation groove 804, and an oil inlet 805. The first sealing ring 7 is arranged in the first sealing ring installation groove 802, the second sealing ring 9 is arranged in the second sealing ring installation groove 804, the valve body installation surface 803 contacts the side wall at the lower end of the valve body 4, the lower end of the oil inlet 805 is communicated with the second using device, and the upper end of the oil inlet 805 is communicated with the valve seat installation surface 406; on the side wall of the armature 11, there are a sliding contact surface 1101 and a plurality of radial through-flow holes 1102. The upper end of the sliding contact surface 1101 can move on the inner side wall of the guide sleeve 13, the middle end of the sliding contact surface 1101 can move on the inner side wall at the upper end of the valve body 4, the lower end of the sliding contact surface 1101 can move on the inner side wall of the spring 5. The first ends of the plurality of radial through-flow holes 1102 contact the inner side wall of the spring 5. The second ends of the plurality of radial through-flow holes 1102 converge at one place and are communicated with the second end of the axial through-flow hole 1106. The first end of the axial through-flow hole 1106 is arranged in the middle of the highest surface of the armature 11. The axial through-flow hole 1106 is arranged inside the armature 11. At the lower end of the armature 11, there are a plurality of through-flow grooves 1104 and a plurality of lower bosses 1103 of the armature. The through-flow grooves 1104 and the lower bosses 1103 of the armature are arranged alternately and cooperate with the middle part of the valve body 4.

[0046] An adjustable air gap is provided between the first valve cover 1 and the permanent magnet 15.

[0047] The first valve cover 1, the adjusting plug 16, the limiting iron 14, the valve sleeve 2, the armature 11, and the valve body 4 are made of soft magnetic materials. The guide sleeve 13 is made of stainless steel material, and the permanent magnet 15 is made of a permanent magnetic material that can work at high temperatures.

[0048] On the outer surfaces of both the valve body 4 and the second valve cover 8, there are respectively provided grooves for placing rubber sealing rings.

[0049] The working principle of a low-power micro high-speed switching valve of the present invention is further described below in conjunction with embodiments:

[0050] As Figure 7a - Figure 8b shown: The working process of the present invention includes an initial state, an opening process, an opening holding state, a closing process, and a closing holding state. The working principle of this embodiment is described as follows. In the following descriptions, the upward direction is taken as the positive direction of force:

[0051] Initial state: At the initial position, the armature 11 does not move, and the magnetic force F M , spring force F S and hydraulic pressure F h acting on the spool 10 satisfy the relation F M +F S +F h < 0. The resultant force acting on the spool 10 is downward, the valve port is in the closed state, the oil inlet 805 and the oil outlet 405 are not connected, and at the same time, the limit fixing iron 14 is magnetized by the permanent magnet 15;

[0052] Opening process: When the external control power supply is turned on, the generated electrical signal is connected to the coil 3 through the lead wire 12. A positive current +I passes through the coil 3, and the magnetic field generated by the coil 3 further magnetizes the limit fixing iron 14. The magnetic poles on the side of the armature 11 close to the limit fixing iron 14 after passing the positive current +I are of opposite polarity. The magnetic force lines generated by the magnetic field of the armature 11 pass through the limit fixing iron 14, and the electromagnetic force generated between the limit fixing iron 14 and the armature 11 is greater than the resistance, which is the sum of the spring force and the hydraulic force. At this time, the magnetic force F M , spring force F S and hydraulic pressure F h acting on the spool 10 satisfy the relation F M +F S +F h > 0. The resultant force acting on the spool 10 is upward, the armature 11 quickly drives the spool 10 to open, the oil inlet 805 is connected to the oil outlet 405, and the working fluid medium flows in from the oil inlet 805, passes through the inner wall surfaces of the second valve cover 8 and the valve seat 6 respectively to reach the valve port position, and flows out from the oil outlet 405;

[0053] Opening holding state: When the external control power supply is turned off, the electrical signal of the lead wire 12 is disconnected, the coil 3 is powered off, and the magnetic force lines generated by the magnetic field of the permanent magnet 15 still pass through the limit fixing iron 14. The electromagnetic force generated between the limit fixing iron 14 and the armature 11 is greater than the resistance, so that the limit fixing iron 14 and the armature 11 are adsorbed together. At this time, the magnetic force F M , spring force F S and hydraulic pressure F h acting on the spool 10 satisfy the relation F M +F S +F h> 0, the resultant force on the spool 10 is upward, and the armature 11 and the spool 10 remain in the open state. The oil inlet 805 is in communication with the oil outlet 405, and the working fluid medium flows in from the oil inlet 805, passes through the side 606 of the inlet port of the valve seat, the throttling conical surface 605, the throttling orifice 604 of the valve seat, reaches the valve port position, and flows out from the oil outlet 405;

[0054] Closing process: Turn on the external control power supply, so that the electrical signal is connected to the coil 3 through the lead 12. At this time, a reverse current -I is passed through the coil 3, and the coil 3 generates a reverse magnetic field, canceling the magnetic field generated after the permanent magnet 15 and the limit fixing iron 14 are magnetized. The magnetic poles on the side of the armature 11 close to the limit fixing iron 14 after passing the forward current +I are of the same sex, and the limit fixing iron 14 repels the armature 11. The electromagnetic force generated between the limit fixing iron 14 and the armature 11 is less than the resistance. At this time, the magnetic force F M , spring force F S and hydraulic pressure F h satisfy the relationship F M +F S +F h <0, the resultant force on the spool 10 is downward, the armature 11 drives the spool 10 to close quickly, the oil inlet 805 is disconnected from the oil outlet 405, and the working fluid medium cannot pass through this valve body;

[0055] Closing and holding state: Turn off the external control power supply again, the electrical signal in the lead 7 is disconnected, and the coil 3 is de-energized. At the closing position of the spool 10 before the control power supply is turned off, the electromagnetic force generated between the limit fixing iron 14 and the armature 11 is less than the spring resistance. At this time, the magnetic force F M , spring force F S and hydraulic pressure F h satisfy the relationship F M +F S +F h <0, the resultant force on the spool 10 is downward, the armature 11 remains in the closed state, the oil inlet 805 is not in communication with the oil outlet 405, and the working fluid medium cannot pass through this valve body;

[0056] So far, the high-speed switching valve has completed an opening / closing action. Repeating the above process can realize the continuous opening / closing of the electromagnetic switching valve and maintain the opening / closing state.

[0057] The following further describes how a low-power micro high-speed switching valve of the present invention achieves low power consumption in combination with embodiments:

[0058] In a specific embodiment, the working cycle of the high-speed switching valve is T, the required valve opening time is T / 2, the working voltage is U, and the coil resistance is R. The energization times t s , and under normal circumstances, ts If it is much smaller than T, the electric energy consumed by the low-power high-speed switching valve in one motion cycle is W1:

[0059]

[0060] The electric energy consumed by the traditional high-speed switching valve under the same conditions is W2:

[0061]

[0062] The energy consumption ratio of the low-power high-speed switching valve and the traditional high-speed switching valve in one action cycle is:

[0063]

[0064] If the working frequency of the low-power digital valve is f = 50Hz, that is, T = 1 / f = 0.02s, and the energization time is t s = 0.002s, then the energy consumption ratio of the low-power high-speed switching valve and the traditional high-speed switching valve:

[0065]

[0066] It is only 2 / 5 of the energy consumption of the traditional high-speed switching valve. Thus, it can be obtained that compared with the traditional high-speed switching valve, the low-power micro high-speed switching valve has obvious energy-saving effect, and with the increase of the valve working time, the energy-saving effect is more prominent.

[0067] The following further describes how the spool 10 movement in the opening and closing process of a low-power micro high-speed switching valve of the present invention can be actively controlled in combination with embodiments:

[0068] The principle is verified through electromagnetic field finite element simulation. In the simulation, a positive current +I and a negative current -I are respectively passed through the coil 3, corresponding to generating excitations of positive ampere-turns NI and negative ampere-turns NI. The simulation results are shown in Figure 7.

[0069] As Figure 7a shown, the electromagnetic force F M varies with the given positive excitation, that is, the positive ampere-turns NI. The electromagnetic force F M is positively correlated with the positive ampere-turns NI. The larger the ampere-turns NI, the larger the generated electromagnetic force F M is;

[0070] As Figure 7b shown, the electromagnetic force F M varies with the given negative excitation, that is, the negative ampere-turns NI. The electromagnetic force F M is negatively correlated with the negative ampere-turns NI. The larger the value of the ampere-turns NI, the smaller the generated electromagnetic force F M is;

[0071] It can be obtained that during the opening and closing process of the valve, by controlling the excitation of the given coil 3, that is, controlling the magnitude and positive / negative value of the ampere-turns NI, the electromagnetic force F received by the armature 11 is controlled. M , and then the active control of the movement state of the valve core 10 during the opening and closing processes of the valve is realized.

[0072] The following further describes how a low-power micro high-speed on-off valve of the present invention adjusts the adjusting plug 16 to change the electromagnetic force F in combination with embodiments: M Further description:

[0073] The electromagnetic force F between the armature 11 and the limiting fixed iron 14 M is described as:

[0074]

[0075]

[0076] where φ is the air-gap magnetic flux passing between the armature 11 and the limiting fixed iron 14, μ0 is the vacuum permeability, A is the cross-sectional area of the relative cross-section of the armature 11 and the limiting fixed iron 14, and ∑R i is the sum of the magnetic resistances of each position of the valve electromagnetic mechanism.

[0077] The calculation formula for the air-gap magnetic resistance R1 between the permanent magnet 15 and the limiting fixed iron 14 is:

[0078]

[0079] where x1 is the distance between the permanent magnet 15 and the limiting fixed iron 14, and A1 is the cross-sectional area of the relative cross-section of the permanent magnet 15 and the limiting fixed iron 14.

[0080] From the above formula, it can be obtained that by adjusting the adjusting plug 16 to change the distance x1 between the permanent magnet 15 and the limiting fixed iron 14, the magnetic resistance of the valve electromagnetic mechanism is changed, and then the air-gap magnetic flux φ passing between the armature 11 and the limiting fixed iron 14 is changed. Finally, the adjustment of the electromagnetic force F received by the armature 11 is realized M to meet the requirements of the actual working conditions.

[0081] Furthermore, the adjustment effect of the electromagnetic force F is described through simulation M , as shown in Figure 8.

[0082] As Figure 8a can be seen, changing the air-gap length x1 can change the electromagnetic force F during the opening process M , and the larger the air-gap length x1, the smaller the electromagnetic force F M .

[0083] As Figure 8b can be seen, changing the air-gap length x1 can change the electromagnetic force F during the closing process MMoreover, the greater the air gap length x1, the smaller the electromagnetic force F M becomes;

[0084] From this, it can be obtained that by adjusting the adjusting plug 16 and changing the distance between the permanent magnet 15 and the limit fixed iron 14, the adjustment of the electromagnetic force F M can be achieved to better meet the usage requirements of the high-speed on-off valve.

[0085] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention shall fall within the protection scope determined by the claims of the present invention.

Claims

1. A low-power micro high-speed switching valve, characterized in that: It includes a valve body mechanism, an electromagnetic mechanism, and a valve core mechanism; both the electromagnetic mechanism and the valve core mechanism are arranged inside the valve body mechanism; The valve body mechanism includes a valve sleeve, a first valve cover, a second valve cover, a valve body, a valve seat, a first sealing ring, a second sealing ring, a guide sleeve, and a limit fixed iron; the side surface of one end of the first valve cover is connected to the first end of the valve sleeve, the second end of the valve sleeve is connected to the first end of the valve body, and the side wall of the second end of the valve body is connected to one end of the second valve cover; the valve seat is arranged inside the connection between the valve body and the second valve cover, the lower end of the valve seat contacts the second valve cover, and the upper end of the valve seat contacts the valve core mechanism; the first sealing ring is arranged at the connection between the valve body and the second valve cover, and the second sealing ring is arranged at the connection between the valve seat and the second valve cover; both the guide sleeve and the limit fixed iron are arranged inside the electromagnetic mechanism; The electromagnetic mechanism includes a coil, a lead wire, a permanent magnet, and an adjusting plug, and the side wall of the adjusting plug contacts the inner side wall of the first valve cover; the lower surface of the adjusting plug is connected to the upper surface of the permanent magnet, the lower surface of the permanent magnet contacts the upper surface of the limit fixed iron, and the lower surface of the limit fixed iron contacts the upper surface of the valve core mechanism; the inner side wall of the guide sleeve contacts the sliding contact surfaces of the limit fixed iron and the armature, the outer side wall of the guide sleeve contacts the inner side wall of the coil, and the outer side wall of the coil contacts the inner side wall of the valve sleeve; multiple lead wires are provided on the coil; The valve core mechanism includes a spring, a valve core, and an armature. The spring is sleeved on the side wall of the armature. The upper surface of the armature contacts the lower surface of the limit fixed iron. The upper end side wall of the armature is connected to the lower end inner side wall of the guide sleeve. The middle end side wall of the armature contacts the upper end inner side wall of the valve body. The lower end side wall of the armature contacts the inner side wall of the spring. The outer side wall of the spring contacts the inner side wall of the valve body. The valve core is arranged inside the center of the lower end of the armature and contacts the upper surface of the valve seat.

2. The low-power micro high-speed switching valve according to claim 1, wherein: A first valve cap boss side is provided at the lower end of the first valve cap. The outer side wall of the first valve cap boss side contacts the inner side wall of the upper end of the valve sleeve. The first valve cap has a through structure and has a first space. An internal hexagonal square hole, an adjusting plug mounting hole, and a permanent magnet cavity are sequentially arranged in the first space. The adjusting plug is arranged in the adjusting plug mounting hole, and the upper end of the permanent magnet contacts the permanent magnet cavity. A valve body side groove is provided on the side wall of the valve body. The side wall of the valve body is used to contact a first using device. A second valve cap mounting surface is provided at the bottom of the valve body. The second valve cap mounting surface contacts the inner side surface of the second valve cap. The valve body has a through structure and has a second space. An armature mating surface, a spring cavity, an oil outlet, and a valve seat mounting surface are sequentially arranged in the second space. The armature mating surface is used to contact the middle end of the armature. The spring is arranged in the spring cavity. The oil outlets are arranged on both sides of the spring cavity and are through ports. The valve seat is arranged in the valve seat mounting surface.

3. The low-power micro high-speed switching valve according to claim 1, characterized in that: A valve seat upper boss side and a valve seat lower boss side are provided on the side surface of the valve seat. The valve seat lower boss side contacts the inner wall of the lower end of the valve seat. A valve seat oil outlet chamfer is provided at the center position of the upper surface of the valve seat. One end of the valve seat oil outlet chamfer contacts the valve core. The valve seat has a through structure and has a third space. A throttle orifice, a throttle conical surface, and a valve seat inlet side are sequentially arranged in the third space. The upper end of the throttle orifice is connected to one end of the valve seat oil outlet chamfer. The lower end of the throttle orifice is connected to the upper end of the throttle conical surface. The lower end of the throttle conical surface is connected to the upper end of the valve seat inlet side. A second valve cap side groove is provided on the outer side wall of the second valve cap. The second valve cap side groove can be connected to the using device. The second valve cap has a through structure and has a fourth space. A first seal ring mounting groove, a valve body mounting surface, a second seal ring mounting groove, and an oil inlet are sequentially arranged in the fourth space. The first seal ring is arranged in the first seal ring mounting groove. The second seal ring is arranged in the second seal ring mounting groove. The valve body mounting surface contacts the side wall of the lower end of the valve body. The lower end of the oil inlet is communicated with a second using device. The upper end of the oil inlet is communicated with the valve seat mounting surface. A sliding contact surface and a plurality of radial flow holes are provided on the side wall of the armature. The upper end of the sliding contact surface can move on the inner side wall of the guide sleeve. The middle end of the sliding contact surface can move on the inner side wall of the upper end of the valve body. The lower end of the sliding contact surface can move on the inner side wall of the spring. The first ends of the plurality of radial flow holes contact the inner side wall of the spring. The second ends of the plurality of radial flow holes converge at one place and are communicated with the second end of the axial flow hole. The first end of the axial flow hole is arranged in the middle of the highest surface of the armature. A plurality of flow grooves and a plurality of armature lower bosses are provided at the lower end of the armature. The flow grooves and the armature lower bosses are arranged alternately and cooperate with the middle part of the valve body.

4. The low-power micro high-speed switching valve according to claim 1, wherein: An adjustable air gap is provided between the first valve cover and the permanent magnet.

5. The low-power micro high-speed switching valve according to claim 1, wherein: The first valve cover, the adjusting plug, the limiting iron core, the valve sleeve, the armature and the valve body are made of soft magnetic materials, and the permanent magnet is made of a permanent magnetic material capable of working at high temperatures.

6. The low-power micro high-speed switching valve according to claim 1, characterized in that: Grooves are respectively provided on the outer surface of the valve body and the outer surface of the second valve cover, and the grooves are used for placing rubber sealing rings.

7. A method for using the low-power micro high-speed switching valve according to any one of claims 1-6, characterized in that: It includes the following steps: S1. At the initial position, the armature does not move, the valve port is in the closed state, the oil inlet and the oil outlet are not connected, and at the same time, the limiting iron core is magnetized by the permanent magnet. S2. Turn on the external control power supply, and the generated electrical signal is connected to the coil through the lead wire. A positive current +I passes through the coil, and the magnetic field generated by the coil further magnetizes the limiting iron core. The magnetic poles on the side of the armature close to the limiting iron core after passing the positive current +I are of opposite polarity. The magnetic force lines generated by the magnetic field of the armature pass through the iron core, and the electromagnetic force generated between the iron core and the armature is greater than the resistance. The resistance is the sum of the spring force and the hydrodynamic force. The armature quickly drives the valve core to open, the oil inlet and the oil outlet are connected, and the working fluid medium flows in from the oil inlet, passes through the inner wall surfaces of the second valve cover and the valve seat respectively to reach the valve port position, and flows out from the oil outlet of the valve body. S3. Turn off the external control power supply, disconnect the electrical signal of the lead wire, and the coil is powered off. The magnetic force lines of the magnetic field generated by the permanent magnet still pass through the iron core, and the electromagnetic force generated between the iron core and the armature is greater than the resistance, so that the limiting iron core and the armature are adsorbed together, and the armature and the valve core remain in the open state; the oil inlet and the oil outlet are connected, and the working fluid medium flows in from the oil inlet, passes through the side of the inlet of the valve seat, the throttling conical surface, the throttling orifice of the valve seat, reaches the valve port position, and flows out from the oil outlet. S4. Turn on the external control power supply, connect the electrical signal to the coil through the lead wire. At this time, a reverse current -I is passed through the coil, and the coil generates a reverse magnetic field to cancel the magnetic field generated after the permanent magnet and the limiting iron core are magnetized. The magnetic poles on the side of the armature close to the limiting iron core after passing the positive current +I are of the same polarity. The limiting iron core and the armature repel each other, and the electromagnetic force generated between the limiting iron core and the armature is less than the resistance. The armature drives the valve core to quickly close, the oil inlet and the oil outlet are disconnected, and the working fluid medium cannot pass through this valve body. S5. Turn off the external control power supply again, the electrical signal is disconnected, and the coil is powered off. At the valve core closing position before the control power supply is turned off, the electromagnetic force generated between the limiting iron core and the armature is less than the spring resistance, and the armature remains in the closed state. The oil inlet and the oil outlet are not connected, and the working fluid medium cannot pass through this valve body. S6. Repeat the above steps S1 - S5, and the continuous opening / closing and maintaining the opening / closing state of the electromagnetic switch valve can be repeated; in addition, by using a hex wrench to cooperate with the hexagonal socket on the adjusting plug, the position of the permanent magnet in the valve can be adjusted, and thus the magnetic field and electromagnetic force generated by the permanent magnet can be adjusted.

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