Three-way high-speed switch electromagnetic valve

Abstract

A three-way high-speed switch electromagnetic valve belongs to the field of switch electromagnetic valves and is characterized in that a sleeve is hollow, a magnetic conductive tube, a magnetic isolation ring and the upper portion of a valve seat are hermetically arranged in an inner cavity of the sleeve from top to bottom, an armature is arranged in the magnetic conductive tube, an electromagnetic coil is arranged outside the sleeve, and the armature is in contact with an ejector pin located in the valve seat; the lower portion of the valve seat is connected with the buckling head, the bottom face of the valve seat is connected with the upper pore plate, the upper pore plate and the lower pore plate are separated through the isolation pad, the ball is located in the isolation pad, the spring and the spring seat are located in the spring guide sleeve, and the spring seat is in contact with the ball through a small hole of the lower pore plate from the lower portion under the action of the spring. Meanwhile, an ejector pin in the valve seat is in contact with the ball body through a long hole in the valve seat and a small hole of the upper pore plate; the oil inlet is located in the lower middle portion of the valve seat, a working oil port is formed in the joint of the outer wall of the lower portion of the valve seat and the buckling head and communicated with a hydraulic oil channel of the isolation pad, and the oil return port is located in the bottom of the buckling head. The speed is higher, the integration level is higher, the size is more compact, and meanwhile the flow is higher.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of on-off electromagnetic valve, and relates to a three-way high-speed on-off electromagnetic valve. BACKGROUND

[0002] In hydraulic control, although on-off control is a common control mode, it is far lower than proportional hydraulic control in control performance. However, on-off control has significant advantages, such as simple structure, easy miniaturization, low cost, strong anti-pollution ability and low manufacturing precision requirement. How to realize high-performance proportional control by on-off control has been an important research direction in the field of fluid transmission such as hydraulic and pneumatic, and the most critical technology is how to realize high-speed on-off control. It is proved in theory and practice that precise proportional continuous control can be realized by using high-speed switching elements through pulse width modulation (PWM) technology, and the technology has been widely used in the field of electronics, such as precise control of motors. Similarly, in the field of fluid transmission, similar technology, i.e. hydraulic PWM control, can be used to realize precise proportional hydraulic continuous control by using high-speed on-off electromagnetic valve, so as to realize precise regulation of pressure or flow. For example, in the automobile ABS brake system, high-speed on-off electromagnetic hydraulic valve is commonly used to realize precise control of automobile braking force, and the structure is simple, the cost is low, and the reliability is high. In addition, in the field of low-power hydraulic control, high-speed on-off valve controlled by hydraulic PWM has also been applied to a certain extent, and it is an important means to realize miniaturization and small size of hydraulic control, and requires high-speed on-off valve with very compact and small size.

[0003] However, the traditional high-speed on-off valve is mostly in the structure of two-way valve, and two on-off valves (usually one normally open valve and one normally closed valve are used in pairs) are needed to realize continuous control of fluid pressure or flow. At the same time, some existing on-off valves need to use precise motion structure, which brings difficulties to the miniaturization of on-off valves.

[0004] In hydraulic control, continuous flow and pressure control is usually achieved by continuously adjusting the flow area on the hydraulic circuit, and the flow area adjustment is usually achieved by slide valve and cone valve. Although the on-off valve cannot continuously adjust the flow area of hydraulic oil, it only has two states of opening and closing, but it usually adopts these two ways in structure. Whether it is a slide valve or a cone valve, high precision is required in processing to ensure that the matching gap between the valve core and the valve hole or valve seat meets the design requirements, which not only increases the manufacturing cost, but also is not conducive to the miniaturization of components, and the cleanliness of the oil is also required. High, and after a long time of use, it is easy to cause leakage or control inaccuracy due to wear. Therefore, how to simplify the structure, reduce the volume, reduce the cost and improve the reliability under the premise of ensuring the performance of the hydraulic valve has become one of the problems to be solved in the development of hydraulic control technology. Among the two structures of slide valve and cone valve, the cone valve structure is relatively simple, and a deformation of the cone valve is to use a spherical structure, replace the conical valve core with a spherical one, and cooperate with the conical hole or flat circular hole valve seat, further simplify the structure and manufacturing, so this ball valve structure is widely used in on-off valve design, especially in small and medium flow on-off valve design. In the design of high-speed on-off valve, in order to improve the switching speed, the valve is usually designed into a two-way structure, divided into two forms of normally open and normally closed.

[0005] The existing high-speed on-off valve is mainly two-way valve. If this high-speed on-off valve is used, pulse width modulation (PWM) is used to achieve continuous control of the pressure and flow of the hydraulic system, which requires the use of a normally open and a normally closed two on-off valves. Through PWM modulation control of the two on-off valves, continuous variable pressure and flow can be output at the working oil port, so as to complete various fine hydraulic control that can only be realized by slide valve. The common high-speed on-off valve products at present mainly include various high-speed on-off valves used in automobile ABS brake systems, various high-speed on-off valves used in engineering machinery hydraulic pilot control, such as high-speed on-off valve of Guizhou Honglin Vehicle Electronic Control Technology Co., Ltd., high-speed on-off valve of Ningbo Saifu Automobile Brake Co., Ltd., high-speed on-off pilot valve for PVG multi-way valve of Danfoss Company of USA, EHPV valve of HUSCO Company of USA, etc. These are typical two-way high-speed on-off valves, which have normally open and normally closed types, and the two types of valves are usually used together.

[0006] There are also high-speed switching valves implemented using a three-way valve design, such as the HSV two-position three-way high-speed switching valve from Guizhou Honglin Automotive Electronic Control Technology Co., Ltd., the CMA series multi-way valve pilot control valve from Eaton Corporation (USA), the pulse electrohydraulic proportional pilot valve (Pulsar electrohydraulic pilot valve) used in the VPL series multi-way valves from Parker Corporation (USA), and the PVEA valve from Danfoss Corporation (USA). Essentially, all of these integrate two switching valves, but their implementation principles differ. Eaton's CMA valve uses a spool valve structure; Parker uses an adjustable hydraulic resistance plus a fixed hydraulic resistance method, essentially replacing the normally open valve with a fixed throttle valve; Guizhou Honglin Automotive Electronic Control Technology Co., Ltd. uses a double-ball valve structure; and Danfoss also uses a double-ball valve structure, all of which can achieve two-position three-way high-speed switching functionality. Compared to other structures, the double-ball structure has hydraulic self-shutdown capability, enabling faster switching speeds.

[0007] In existing high-speed switching valve designs, two-position two-way switching valves have the advantages of simple structure and high switching speed, but their requirement for pairing makes them costly and bulky, which is not conducive to the miniaturization and micro-miniaturization of hydraulic control components. In the design of two-position three-way on / off valves, valves using a spool valve structure, such as Eaton's CMA valve, require high machining and assembly precision, resulting in a larger size and affecting the corresponding switching speed. Parker's pulse electro-hydraulic pilot valve, due to its fixed hydraulic resistance, cannot close the working port and return port, relying solely on the opening and closing of the inlet port for adjustment, leading to large leakage, significant hydraulic power loss, and a larger size, which is not conducive to further miniaturization and integration of hydraulic components. Guizhou Honglin Automotive Electronic Control Technology Co., Ltd. uses a threaded cartridge structure with an internal double ball valve and conical valve seat structure. Although this solves the problem of large leakage, the use of ball valves and conical valve seats results in high machining and assembly precision requirements, hindering further size reduction. Danfoss's PVEA valve also uses a double ball valve structure, but unlike Guiyang Honglin, it uses an orifice plate as the valve seat for the ball valve core, resulting in a smaller size and lower machining and assembly precision requirements. However, the distance between the two balls is too close, affecting the hydraulic oil flow output and resulting in low hydraulic drive power. Summary of the Invention

[0008] To overcome the shortcomings of existing technologies, this invention provides a three-way high-speed switching solenoid valve that combines two miniature high-speed switching valves to form a three-way high-speed switching valve with two valve ports. When one valve port is open, the other valve port is closed. The moving parts do not require precise fitting, which can achieve a very compact miniature structure. Moreover, it has hydraulic self-shutdown characteristics, which not only makes the switching speed faster, but also simplifies the oil circuit during use, reduces the number of switching valves by half, and significantly reduces costs.

[0009] The technical solution adopted by this invention to solve its technical problem is: A three-way high-speed switching solenoid valve includes an electromagnetic coil, a magnetic tube, a sleeve, an armature, a magnetic shielding ring, a pin, a valve seat, an upper orifice plate, a lower orifice plate, an isolation pad, a positioning pin, a ball, a return spring, a spring seat, a spring guide sleeve, and a snap-fit ​​head; The sleeve is hollow, and the magnetic tube, magnetic shielding ring, and upper part of the valve seat are sealed from top to bottom in the inner cavity of the sleeve. The lower end of the magnetic tube is connected to the upper end of the magnetic shielding ring, and the lower end of the magnetic shielding ring is connected to the top of the upper part of the valve seat. There is an armature inside the magnetic tube, and there is an electromagnetic coil outside the sleeve. The armature is in contact with the pin located inside the valve seat. The lower part of the valve seat is connected to the pressing head. The pressing head contains, from top to bottom, an upper orifice plate, a spacer, a ball, a lower orifice plate, a spring seat, a spring, and a spring guide sleeve. The bottom surface of the valve seat is connected to the upper orifice plate. The upper and lower orifice plates are separated by the spacer. The ball is located within the spacer, and the spring and spring seat are located within the spring guide sleeve. Under the action of the spring, the spring seat maintains contact with the ball from below through a small hole in the lower orifice plate. Simultaneously, the ejector pin inside the valve seat contacts the ball through an internal elongated hole in the valve seat and a small hole in the upper orifice plate. The oil inlet is located in the lower middle part of the valve seat. A working oil port is provided at the connection between the lower outer wall of the valve seat and the crimping head. The working oil port is connected to the hydraulic oil passage of the isolation pad. The oil return port is located at the bottom of the crimping head.

[0010] Furthermore, the isolation pad is provided with a plum blossom pattern of holes, and the sphere is located inside the plum blossom pattern of holes.

[0011] Furthermore, the isolation pad has an oil passage groove at the bottom as a hydraulic oil passage.

[0012] Alternatively: the isolation pad has an oil hole in the middle as a hydraulic oil passage.

[0013] The isolation pad is provided with a pin hole, and the bottom of the valve seat is also provided with a pin hole. The isolation pad and the bottom of the valve seat are positioned and assembled by a locating pin.

[0014] Preferably, the spring guide sleeve is tapered with a smaller inner diameter at the top and a larger inner diameter at the bottom.

[0015] The upper orifice plate, isolation pad, ball, lower orifice plate, spring seat, spring and spring guide sleeve are all wrapped by the clamping head, and the clamping structure tightly presses the lower orifice plate, isolation pad and upper orifice plate to the bottom of the valve seat.

[0016] The upper and lower parts of the sleeve cavity are respectively provided with a first sealing ring and a second sealing ring. In this scheme, the magnetic conductor tube and the valve seat are isolated by a magnetic isolation ring, the upper part of the valve seat, the magnetic isolation ring and the magnetic conductor tube are wrapped and connected by the sleeve, and two sealing rings are used to prevent hydraulic oil leakage.

[0017] The outer walls of the valve seats above and below the oil inlet are respectively provided with a third sealing ring and a fourth sealing ring, and the middle of the outer wall of the pressure head is provided with a fifth sealing ring.

[0018] The technical concept of this invention is as follows: using a ball as a valve core, and upper and lower orifice plates as the pressure oil inlet and return oil outlet respectively. Through the combined action of the electromagnetic coil driving the armature and the ejector pin, and the ball's return spring, the ball is controlled to either block the pressure oil inlet channel of the small hole in the upper orifice plate or block the return oil channel of the small hole in the lower orifice plate, thereby realizing the connection between the working oil port and the oil inlet, or the working oil port and the return oil port. By controlling the ball to switch at high speed between the upper and lower orifice plates, the working oil port is controlled to alternately connect with the oil inlet or the return oil port, thereby realizing the control of the output pressure of the working oil port.

[0019] This invention features an upper and lower orifice plate. A single sphere either blocks the upper or lower orifice plate. To provide sufficient working space for the sphere, an isolation pad separates the upper and lower orifice plates at a certain distance. The isolation pad has a quincunx-shaped through hole in its center, allowing the sphere to move up and down within the hole. This precise clearance fit between the sphere and the hole provides accurate guidance for the steel ball and also facilitates the flow of hydraulic oil. An oil passage groove is located at the bottom of the isolation pad, serving as a hydraulic oil passage. A pin hole is present on the isolation pad, and a corresponding pin hole is also present at the bottom of the valve seat. A locating pin ensures the correspondence between the oil passage groove at the bottom of the isolation pad and the groove at the bottom of the valve body, providing a passage for hydraulic oil. The spring guide sleeve has a tapered hole, guiding the tapered steel ball return spring and spring seat, preventing them from shifting during operation.

[0020] The beneficial effects of this invention are mainly reflected in: 1. Compared with two-way switching valves, this invention is a two-position three-way switching valve, which is faster and has a higher degree of integration; 2. Compared with existing two-position three-way switching valves, it is more compact in size and has a higher flow rate, which is conducive to high-power miniaturization; 3. Compared with the existing two-position three-way switch valve, the present invention has only one ball valve core, which can achieve a faster switching speed; 4. By setting quincunx-shaped holes in the isolation pad, precise guidance is provided for the ball valve core, while also providing a sufficiently large channel for hydraulic oil flow, allowing for a larger working flow rate; 5. The perforated design of the isolation pad provides precise guidance for the spherical valve core, ensuring its stability during high-speed switching and accelerating the switching response; 6. Compared with two-position three-way spool valves, the structure of the present invention, which combines a single ball valve core and a double orifice plate, is simpler, requires less precision in processing and assembly, and has a better switching effect; 7. Compared with a two-position three-way switch valve with a fixed throttling orifice, the present invention has a dual variable throttling orifice. Both the upper and lower orifice plates can be opened and closed with a ball valve core. The channels between the working oil port, the oil inlet, and the oil return port can be fully opened and closed. In comparison, this greatly reduces internal leakage and provides better switching performance. 8. Compared with the double-ball structure of the on / off valve, the single-ball valve core structure is simpler, more compact, and more conducive to miniaturization. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of a three-way high-speed switching solenoid valve.

[0022] Figure 2 This is a partial lateral cross-sectional view of a three-way high-speed switching solenoid valve.

[0023] Figure 3 This is an exploded view of a three-way high-speed switching solenoid valve (the solenoid coil is omitted).

[0024] Figure 4 This is a schematic diagram of hydraulic oil flow when the electromagnetic coil is energized.

[0025] Figure 5 This is a schematic diagram of hydraulic oil flow when the electromagnetic coil is de-energized.

[0026] Figure 6 This is a structural diagram of an isolation pad.

[0027] Figure 7 yes Figure 6 The bottom view of the isolation pad.

[0028] Figure 8 This is a structural diagram of another type of isolation pad.

[0029] Figure 9 yes Figure 8 Side view of the isolation pad.

[0030] Figure 10 Is adopted Figure 8 The diagram shows the flow of hydraulic oil when the isolation pad is in the state of the electromagnetic coil being energized.

[0031] Figure 11 Is adopted Figure 8 The diagram shows the flow of hydraulic oil when the electromagnetic coil is de-energized.

[0032] The attached diagram is labeled as follows: 1. First sealing ring, 2. Magnetic tube, 3. Magnetic shielding ring, 4. Second sealing ring, 5. Pressure oil inlet, 6. Fourth sealing ring, 7. Working oil port, 8. Ball, 9. Fifth sealing ring, 10. Spring seat, 11. Return spring, 12. Oil return port, 13. Press head, 14. Spring guide sleeve, 15. Lower orifice plate, 16. Isolation pad, 17. Upper orifice plate, 18. Third sealing ring, 19. Valve seat, 20. Ejector pin, 21. Armature, 22. Sleeve, 23. Electromagnetic coil, 24. Positioning pin, 25. Positioning pin hole, 26. Plum blossom hole, 27. Oil groove, 28. Central oil passage hole. Detailed Implementation

[0033] The present invention will now be further described with reference to the accompanying drawings.

[0034] Reference Figures 1-11 A three-way high-speed switching solenoid valve includes a first sealing ring 1, a magnetic tube 2, a magnetic shielding ring 3, a second sealing ring 4, a fourth sealing ring 6, a ball 8, a fifth sealing ring 9, a spring seat 10, a return spring 11, a pressing head 13, a spring guide sleeve 14, a lower orifice plate 15, an isolation pad 16, an upper orifice plate 17, a third sealing ring 18, a valve seat 19, a ejector pin 20, an armature 21, a sleeve 22, a solenoid coil 23, and a positioning pin 24. The sleeve 22 is hollow. The magnetic tube 2, the magnetic isolation ring 3, and the upper part of the valve seat 19 are sealed from top to bottom inside the sleeve 22. The lower end of the magnetic tube 2 is connected to the upper end of the magnetic isolation ring 3, and the lower end of the magnetic isolation ring 3 is connected to the top of the upper part of the valve seat 19. In this design, the magnetic isolation ring 3 isolates the magnetic tube 2 and the valve seat 19. The sleeve 22 wraps around and connects the upper part of the valve seat 19, the magnetic isolation ring 3, and the magnetic tube 2, and seals them with the first sealing ring 1 and the second sealing ring 4 to prevent hydraulic oil leakage. The magnetic tube 2 has an armature 21 inside, and the sleeve 22 has an electromagnetic coil 23 outside. The armature 21 contacts the ejector pin 20 located inside the valve seat 19. At the same time, the ejector pin 20 passes through the elongated hole inside the valve seat 19 and the small hole on the upper plate 17. The hole and the ball 8 are in contact; the upper hole plate 17 and the lower hole plate 15 are separated by the isolation pad 16, and the ball 8 is located in the plum blossom hole of the isolation pad 16; the return spring 11 and the spring seat 10 are located in the conical hole of the spring guide sleeve 14, and the spring seat 10 is in contact with the ball 8 from below through the small hole of the lower hole plate 15 under the action of the return spring 11; the bottom surface of the valve seat 19 is in contact with the upper hole plate 17, and the upper hole plate 17, the isolation pad 16, the ball 8, the lower hole plate 15, the return spring 11, the spring seat 10 and the spring guide sleeve 14 are all wrapped by the clamping head 13. The clamping structure tightly presses the lower hole plate 15, the isolation pad 16 and the upper hole plate 17 onto the bottom of the valve seat 19. At the same time, the isolation pad 16 and the bottom of the valve seat 19 are also guaranteed to have a certain positional assembly relationship by the positioning pin 24.

[0035] ReferenceFigure 6 and Figure 7 The isolation pad 16 has an oil passage 27 at its bottom as a hydraulic oil passage, such as... Figure 6 As shown; the isolation pad has pin holes 25, as... Figure 7 As shown, the bottom of the valve seat 19 also has a corresponding pin hole, and the positional correspondence between the isolation pad 16 and the valve seat 19 is as follows. Figure 3 As shown, the positioning pin 24 ensures the correspondence between the oil passage groove at the bottom of the isolation pad 16 and the slot at the bottom of the valve seat 19, thus providing a passage for hydraulic oil.

[0036] In this embodiment, refer to Figure 4 and Figure 5 The oil inlet 5 is located in the lower middle part of the valve seat 19. The outer walls of the valve seat above and below the oil inlet 5 are respectively provided with a third sealing ring 18 and a fourth sealing ring 6. The lower outer wall of the valve seat is provided with a working oil port 7 at the connection with the crimping head 13. The return oil port 12 is located at the bottom of the crimping head 13. The middle part of the outer wall of the crimping head 13 is provided with a fifth sealing ring 9. The pressurized oil enters the valve seat from the oil inlet 5, is discharged from the working oil port 7 to drive the working load, then enters from the working oil port 7, and then returns to the oil tank from the oil outlet 12.

[0037] Reference Figure 4 When the electromagnetic coil 23 is energized, the armature 21 pushes the ejector pin 20 downwards, thereby pushing the ball 8 to open the hole in the upper orifice plate 17 while simultaneously blocking the hole in the lower orifice plate 15, forcing the hydraulic oil to flow as... Figure 4 As shown by the middle arrow, the oil enters from the inlet 5, passes through the small holes of the upper perforated plate 17, the plum blossom holes of the isolation pad 16, the oil passage groove at the bottom of the isolation pad 16, and is discharged from the working oil port 7 to drive the working load.

[0038] Reference Figure 5 When the electromagnetic coil 23 is de-energized, the force exerted by the ejector pin 20 on the ball 8 disappears. Under the action of the spring 11, the spring seat 10 presses against the ball 8, opening the small hole in the lower orifice plate 15, while simultaneously blocking the small hole on the upper orifice plate 17 to obstruct the passage of hydraulic oil from the inlet 5 to the working port 7, forcing the hydraulic oil to flow as... Figure 5 As shown by the middle arrow, the working hydraulic oil enters from the working oil port 7, passes through the oil groove at the bottom of the isolation pad 16, the small hole in the lower orifice plate 15, the tapered hole inside the spring guide sleeve 14, and the return oil port 12 at the bottom of the pressure head 13, connecting with the return oil circuit to release the pressure of the working hydraulic oil. Figure 1 , Figure 4 and Figure 5As shown, the lower orifice plate 15, the isolation pad 16, and the upper orifice plate 17 are wrapped by the clamping head 13 and pressed tightly onto the valve seat 19. The ball 8 is confined within the perforated hole of the isolation pad 16. The conical spring 11 and the spring seat 10 are confined within the spring guide sleeve 14 with a conical hole. Under the action of the spring 11, the spring seat 10 passes through the small hole of the lower orifice plate 15 and maintains contact with the ball 8. After removing the solenoid coil, the various parts of the three-way high-speed switching solenoid valve are as follows: Figure 3 As shown.

[0039] Reference Figure 8 and Figure 9 Alternatively, the isolation pad 16 may not have an oil groove at the bottom, but instead has an oil hole 28 in the middle, allowing the hydraulic oil to flow as follows: Figure 10 and Figure 11 The flow indicated by the middle arrow also ensures the smooth flow of hydraulic oil. Figure 10 It shows the passage through which hydraulic oil enters from the inlet 5 and flows out from the working port 7; Figure 11 This shows the path of hydraulic oil entering from the working port 7 and exiting back to the oil tank from the outlet port 12. (Refer to...) Figure 10 When the electromagnetic coil 23 is energized, the armature 21 pushes the ejector pin 20, which in turn pushes the ball 8 to open the hole in the upper orifice plate 17, while simultaneously blocking the hole in the lower orifice plate 15, forcing the hydraulic oil to flow as... Figure 10 As shown by the middle arrow, the oil enters from the working port 5, passes through the small hole in the upper orifice plate 17, the quincunx hole in the isolation pad 16, and the oil passage hole 28 on the isolation pad 16 (see reference). Figure 8 and Figure 9 Through channels such as the working oil port 7, oil is discharged to drive the working load. (Refer to...) Figure 11 When the electromagnetic coil 23 is de-energized, the force exerted by the ejector pin 20 on the ball 8 disappears. Under the action of the spring 11, the spring seat 10 presses against the ball 8, opening the small hole in the lower orifice plate 15, while simultaneously blocking the small hole on the upper orifice plate 17 to obstruct the passage of hydraulic oil from the inlet 5 to the working port 7, forcing the hydraulic oil to flow as... Figure 11 As shown by the middle arrow, the working hydraulic oil enters from the working port 7, and is connected to the return oil circuit through the oil passage 28 on the isolation pad 16, the small hole of the lower orifice plate 15, the conical hole inside the spring guide sleeve 14, and the return oil port 12 at the bottom of the pressure head 13, thereby depressurizing the working hydraulic oil.

[0040] The embodiments described in this specification are merely examples of implementations of the inventive concept and are for illustrative purposes only. The scope of protection of this invention should not be considered limited to the specific forms stated in these embodiments; rather, it extends to equivalent technical means conceived by those skilled in the art based on the inventive concept.

Claims

1. A three-way high-speed switching solenoid valve, characterized in that, The three-way high-speed switching solenoid valve includes an electromagnetic coil, a sleeve, a magnetic tube, an armature, a magnetic isolation ring, a pin, a valve seat, an upper orifice plate, a lower orifice plate, an isolation pad, a positioning pin, a ball, a return spring, a spring seat, a spring guide sleeve, and a pressing head. The sleeve is hollow. The magnetic tube, magnetic isolation ring, and upper part of the valve seat are sealed from top to bottom within the sleeve cavity. The lower end of the magnetic tube is connected to the upper end of the magnetic isolation ring, and the lower end of the magnetic isolation ring is connected to the top of the upper part of the valve seat. An armature is located inside the magnetic tube, and an electromagnetic coil is located outside the sleeve. The valve seat is in contact with a pin located inside the valve seat; the lower part of the valve seat is connected to the snap-fit ​​head, and the snap-fit ​​head is provided with an upper orifice plate, a spacer, a ball, a lower orifice plate, a spring seat, a spring, and a spring guide sleeve in sequence from top to bottom. The bottom surface of the valve seat is connected to the upper orifice plate, and the upper and lower orifice plates are separated by the spacer. The ball is located in the spacer, and the spring and spring seat are located in the spring guide sleeve. Under the action of the spring, the spring seat maintains contact with the ball from below through the small hole in the lower orifice plate; at the same time, the pin inside the valve seat contacts the ball through the elongated hole inside the valve seat and the small hole in the upper orifice plate. The oil inlet is located in the lower middle part of the valve seat. A working oil port is provided at the connection between the lower outer wall of the valve seat and the crimping head. The working oil port is connected to the hydraulic oil passage of the isolation pad. The oil return port is located at the bottom of the crimping head.

2. The three-way high-speed switching solenoid valve as described in claim 1, characterized in that, The isolation pad has a perforated pattern, and the sphere is located inside the perforated pattern.

3. The three-way high-speed switching solenoid valve as described in claim 2, characterized in that, The isolation pad has an oil passage groove at the bottom as a hydraulic oil passage.

4. The three-way high-speed switching solenoid valve as described in claim 2, characterized in that, The isolation pad has an oil hole in the middle as a hydraulic oil passage.

5. The three-way high-speed switching solenoid valve as described in any one of claims 1 to 4, characterized in that, The isolation pad is provided with a pin hole, and the bottom of the valve seat is also provided with a pin hole. The isolation pad and the bottom of the valve seat are positioned and assembled by a locating pin.

6. The three-way high-speed switching solenoid valve as described in any one of claims 1 to 4, characterized in that, The spring guide sleeve is tapered with a smaller inner diameter at the top and a larger inner diameter at the bottom.

7. The three-way high-speed switching solenoid valve as described in any one of claims 1 to 4, characterized in that, The upper orifice plate, isolation pad, ball, lower orifice plate, spring seat, spring and spring guide sleeve are all wrapped by the clamping head, and the clamping structure tightly presses the lower orifice plate, isolation pad and upper orifice plate to the bottom of the valve seat.

8. The three-way high-speed switching solenoid valve as described in any one of claims 1 to 4, characterized in that, The upper and lower parts of the inner cavity of the sleeve are respectively provided with a first sealing ring and a second sealing ring.

9. The three-way high-speed switching solenoid valve as described in any one of claims 1 to 4, characterized in that, The outer walls of the valve seats above and below the oil inlet are respectively provided with a third sealing ring and a fourth sealing ring, and the middle of the outer wall of the pressure head is provided with a fifth sealing ring.

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