A high-speed switching valve driven by dual electromagnets

Abstract

This invention provides a high-speed switching valve driven by dual electromagnets, comprising a valve body, a gland, a magnetic valve sleeve, a lower electromagnet assembly, a valve core assembly, and an upper electromagnet assembly. The valve body has an axially extending valve sleeve receiving space at its center. The gland is threadedly fixed to the upper end of the valve sleeve receiving space, sealing the upper end of the space to form a valve sleeve receiving cavity. The magnetic valve sleeve is pressed and fixed within the valve sleeve receiving cavity by the gland. The lower electromagnet assembly is located at the bottom and includes a lower fixed iron core, a lower coil frame, a lower coil, and a lower magnetic ring. The valve core assembly includes a valve seat, an iron core ring seat, a moving iron core, a guide roller, and a valve core, and is installed in the middle. The upper electromagnet assembly is located at the top and includes an upper fixed iron core, an upper magnetic ring, an upper coil frame, and an upper coil. This switching valve has a simple structure and reliable performance, effectively reducing the load resistance during valve core opening and closing, and significantly shortening the response time of digital valves.

Description

Technical Field

[0001] This invention belongs to the field of electromagnetic valve technology, specifically relating to a high-speed switching valve driven by dual electromagnets. Background Technology

[0002] Electro-hydraulic digital valves, as key components of digital hydraulic control, possess numerous advantages such as low control energy consumption, high maintainability, and strong anti-pollution capabilities. They effectively meet the higher requirements of modern industrial development for the maintainability, reliability, and intelligence of hydraulic valves, and are widely used in the automotive, aerospace, and industrial fields. However, current digital valves still have many drawbacks. For example, during the operation of high-speed switching valves, energy loss occurs in the armature and valve core due to inertia and friction, thus limiting the improvement of the response speed. Furthermore, traditional high-speed switching valve structures often employ spring return, but elastic elements inevitably suffer fatigue damage after long-term operation, affecting the reliability of the digital valve.

[0003] In some existing control valves, the extension rod on the moving iron core acts on the switching valve ball, causing it to move upward or downward against the spring force of the return spring, thereby raising or lowering the oil circuit. However, the presence of the return spring delays the opening response, thus affecting the valve's response time. To solve this problem, some high-speed switching valves adopt a four-coil double-armature structure. This structure increases the energy loss of the armature and valve core due to inertia and friction, which also limits the improvement of the response speed of high-speed switching valves. Summary of the Invention

[0004] To address the problems existing in the prior art, the present invention provides a high-speed switching valve driven by dual electromagnets. This switching valve has a simple structure and reliable performance. It can effectively reduce the load resistance during the opening and closing process of the valve core, significantly shorten the response time of the digital valve, and effectively avoid fatigue damage to the elastic element, making it easy to widely apply and promote.

[0005] This invention provides a high-speed switching valve driven by dual electromagnets, comprising a valve body, a gland, a magnetic valve sleeve, a lower electromagnet assembly, a valve core assembly, and an upper electromagnet assembly.

[0006] The valve body has an axially extending valve sleeve receiving space at its axis. The lower end of the valve sleeve receiving space extends to a position near the lower end face of the valve body and communicates with the outside through an oil outlet hole opened at the center of the lower end of the valve body. The upper end of the valve sleeve receiving space extends to the upper end face of the valve body and has an internal thread on the inner side of the upper end.

[0007] The size of the gland is adapted to the size of the valve sleeve receiving space. Its outer circular surface is provided with external threads. The gland is fixedly connected to the upper end of the valve sleeve receiving space through threaded connection, and seals the upper end of the valve sleeve receiving space to form a valve sleeve receiving cavity. The upper end of the valve sleeve receiving cavity is connected to the outside through an oil inlet hole opened in the center of the gland.

[0008] The outer diameter of the magnetic valve sleeve is adapted to the size of the valve sleeve cavity, and it is pressed and fixed in the valve sleeve cavity by the pressure cap. The inner side of the upper end and the inner side of the lower end of the magnetic valve sleeve are provided with internal threads.

[0009] The lower electromagnet assembly is located at the bottom of the valve sleeve receiving cavity. It includes a lower fixed iron core, a lower coil frame, a lower coil, and a lower magnetic ring. The lower fixed iron core consists of a large circular disc segment A and a small cylindrical segment A coaxially fixedly connected to the upper central area of ​​the large circular disc segment A. A stepped hole is axially penetrated at the axis of the lower fixed iron core. The outer surface of the large circular disc segment A is provided with external threads and is fixedly connected to the lower end of the magnetic valve sleeve through threaded engagement. A lower annular receiving space is formed between the small cylindrical segment A and the magnetic valve sleeve. The stepped hole consists of a large-diameter oil passage hole A located at the top and a small-diameter oil passage hole A located at the bottom. The inner diameter of the small-diameter oil passage hole A is adapted to the size of the oil outlet hole, and it is aligned with the oil outlet hole. The lower coil frame is annular, and its size is adapted to the size of the lower annular mounting cavity. The lower coil frame is pressed against the inner side of the magnetic valve sleeve by a small cylindrical segment A, and its lower end face is sealed to the upper end face of the large disc segment A. Its upper end face is higher than the upper end face of the lower fixed iron core. The lower coil frame has an annular mounting groove A circumferentially opened on its outer side, and the opening end of the annular mounting groove A extends to the outer circular surface of the lower coil frame. The lower coil is wound on the lower coil frame and located in the annular mounting groove A. The size of the lower magnetic ring matches the size of the lower coil frame. It is coaxially mounted on the upper end of the lower coil frame, and its lower end face is sealed to the upper end face of the lower coil frame.

[0010] The valve core assembly includes a valve seat, an iron core ring seat, a moving iron core, guide rollers, and a valve core. The valve seat is a stepped shaft adapted to the stepped bore, with an axially penetrating oil passage B at its center. The upper inner side of the oil passage B has an inverted frustum-shaped bevel. The valve seat is fixedly inserted into the stepped portion of the stepped bore, with its upper end lower than the upper end of the stepped bore. The iron core ring seat is annular, with its outer diameter matching the inner diameter of the magnetic valve sleeve. Multiple pairs of ball grooves are spaced vertically along the ring's interior. An annular partition is provided between the two parts. The radial opening ends of multiple pairs of ball grooves extend to the inner circular surface of the iron core ring seat, and their axial opening ends extend to the axial end face of the iron core ring seat. The cross-section of the ball grooves is adapted to the guide rollers. The outer diameter of the moving iron core is smaller than the inner diameter of the annular partition. It is inserted into the inner cavity of the iron core ring seat. An annular groove B is formed in the middle of its outer surface. The annular groove B corresponds to multiple pairs of ball grooves, and its height meets the vertical sliding stroke requirements of the moving iron core. An axial groove is formed at the axis of the moving iron core. A through-hole C is provided, and an annular groove A is formed on the outer side of the lower end of the through-hole C. The inner diameter of the annular groove A is smaller than the inner diameter of the large-diameter through-hole A. The middle part of the through-hole C is connected to the outside of the moving iron core through four radial through holes formed on the moving iron core. Multiple pairs of guide rollers are nested in multiple pairs of ball grooves respectively. The valve core is stepped, which consists of a large cylindrical section I at the upper end, a conical section at the lower end, and a small cylindrical section I that transitions between the conical section and the large cylindrical section I. The size of the large cylindrical section I is similar to that of the large cylindrical section I. The size of the annular groove A is matched and it is fixedly inserted into the annular groove A; the taper of the conical section is the same as the taper of the bevel; the valve core assembly is installed in the middle of the valve sleeve receiving cavity, and the lower end face of the iron core ring seat is sealed to the upper end face of the lower magnetic ring. The lower opening ends of the multiple ball grooves located on the lower side are blocked by the lower magnetic ring. The lower end of the moving iron core abuts against the upper end of the lower fixed iron core. The conical section cooperates with the upper end of the oil passage hole B, which is used to open or close the oil passage hole B during axial movement.

[0011] The upper electromagnet assembly is located at the top of the valve sleeve receiving cavity. It includes an upper fixed iron core, an upper magnetic ring, an upper coil frame, and an upper coil. The upper fixed iron core consists of a large circular disc segment B and a small cylindrical segment B coaxially fixedly connected to the lower center region of the large circular disc segment B. An oil passage hole D is opened at the axis of the upper fixed iron core. The outer surface of the large circular disc segment B is provided with external threads and is fixedly connected to the inner side of the upper end of the magnetic valve sleeve through threaded engagement. The upper end face of the large circular disc segment B is sealed to the lower end face of the pressure cap. The distance between the lower end of the small cylindrical segment B and the upper end of the small cylindrical segment A is greater than the length of the moving iron core, and an upper annular receiving space is formed between the small cylindrical segment B and the magnetic valve sleeve. The size of the upper magnetic ring matches the size of the lower magnetic ring, and they are coaxially fixed. The upper magnetic ring is mounted on the upper end of the core ring seat. The lower end face of the upper magnetic ring is sealed to the upper end face of the core ring seat, and the upper opening ends of the multiple ball grooves located on the upper side are blocked. The upper coil frame is annular, and its size is adapted to the size of the upper annular mounting cavity. The upper coil frame is pressed against the inner side of the magnetic valve sleeve by a small cylindrical section B, and the upper end face of the upper coil frame is sealed to the lower end face of the large circular section B. The lower end face of the upper coil frame is located below the lower end of the small cylindrical section B and is sealed to the upper end face of the upper magnetic ring. An annular mounting groove B is opened circumferentially on the outside of the upper coil frame, and the opening end of the annular mounting groove B extends to the outer surface of the upper coil frame. The upper coil is wound on the upper coil frame and located in the annular mounting groove B.

[0012] The moving iron core, upper magnetic ring, upper fixed iron core, lower magnetic ring, lower fixed iron core, and magnetic valve sleeve are all made of soft magnetic material electrical pure iron.

[0013] Furthermore, to ensure the reliability of the assembly, the valve core and the moving iron core are interference-fitted, and the valve seat and the lower fixed iron core are interference-fitted.

[0014] As a preferred embodiment, the oil inlet and oil outlet have the same diameter.

[0015] As a preferred embodiment, sealing rings are installed between the lower end face of the gland and the upper end face of the large disc segment B of the upper fixed iron core, between the lower end face of the large disc segment B of the upper fixed iron core and the upper end face of the upper coil frame, between the lower end face of the upper coil frame and the upper end face of the upper magnetic ring, between the lower end face of the upper magnetic ring and the upper end face of the iron core ring seat, between the lower end face of the iron core ring seat and the upper end face of the lower magnetic ring, between the lower end face of the lower magnetic ring and the upper end face of the lower coil frame, between the lower end face of the lower coil frame and the upper end face of the large disc segment A of the lower fixed iron core, and between the lower end face of the large disc segment A of the lower fixed iron core and the closed end of the valve sleeve accommodating space, and together they form a sealing assembly.

[0016] As a preferred option, the number of pairs of ball grooves is 4, and they are arranged symmetrically along the axis of the moving iron core.

[0017] In this invention, multiple pairs of ball grooves are arranged vertically opposite each other inside the iron core ring seat, and guide rollers are embedded in them. The moving iron core is then inserted into the iron core ring seat, and an annular groove B is formed in the middle of the moving iron core to allow the guide rollers to roll axially. This allows the moving iron core to make indirect line contact with the iron core ring seat through the guide rollers, thus ensuring that the moving iron core is in a low-resistance state during movement. This low-resistance moving iron core structure effectively reduces the resistance during valve core movement, reducing wear on the valve core during operation and ensuring the valve core's alignment. The valve features stable coaxiality, significantly reducing oil leakage. The moving iron core, upper magnetic ring, upper fixed iron core, lower magnetic ring, lower fixed iron core, and magnetic valve sleeve are all made of soft magnetic electrical pure iron. The upper electromagnet assembly, valve core assembly, and lower electromagnet assembly are sequentially arranged inside the magnetic valve sleeve from top to bottom. Under the excitation of the upper coil, a closed upper magnetic flux loop is formed between the moving iron core, upper magnetic ring, upper fixed iron core, and magnetic valve sleeve. Simultaneously, under the excitation of the lower coil, a closed lower magnetic flux loop is formed between the moving iron core, lower magnetic ring, lower fixed iron core, and magnetic valve sleeve. A radial through-hole in the center of the moving iron core effectively connects the oil passage C at the shaft center of the moving iron core to the external space. This encompasses the oil passage to the gap between the iron core ring seat and the moving iron core, ensuring the entire interior of the valve is filled with oil, further reducing the resistance of the moving iron core during operation. Because the valve core is fixedly installed at the lower end of the moving iron core, and the lower end of the oil passage C is also blocked, when neither the upper nor lower electromagnet assembly is energized, the moving iron core is only subjected to the pressure of the oil injection entering through the oil inlet, thus pressing the valve core tightly against the valve seat and sealing the upper end of the oil passage B. This effectively ensures that the switching valve can be in a stable normally closed state when neither the upper nor lower electromagnet assembly is energized. The upper electromagnet assembly has an upper coil wound in the upper coil frame, and the lower electromagnet assembly has a lower coil wound in the lower coil frame. This dual-coil drive method, forming an upper and lower magnetic flux circuit, results in high-speed response performance of the switching valve. At the same time, this structure eliminates the small return spring, reducing the load resistance during valve core movement. While improving the response of the digital valve, it also effectively avoids fatigue damage to elastic elements. The structure is simple, safe, reliable, and easy to widely promote. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the high-speed switching valve opening process in this invention;

[0020] Figure 3 This is a schematic diagram of the high-speed switching valve closing process in this invention;

[0021] Figure 4This is a schematic diagram of the structure of the lower fixed iron core in this invention;

[0022] Figure 5 This is a schematic diagram of the valve core structure in this invention;

[0023] Figure 6 This is a schematic diagram of the lower coil frame in this invention;

[0024] Figure 7 This is a schematic diagram of the valve core assembly in this invention;

[0025] Figure 8 This is a schematic diagram of the moving iron core in this invention;

[0026] Figure 9 This is a schematic diagram of the upper fixed iron core in this invention;

[0027] Figure 10 This is a schematic diagram of the upper coil frame in this invention.

[0028] In the diagram: 1. Gland, 2. Valve body, 3. Magnetic valve sleeve, 4. Upper fixed iron core, 5. Upper coil frame, 6. Upper coil, 7. Upper magnetic ring, 8. Iron core ring seat, 8a. Ball groove, 9. Guide roller, 10. Lower magnetic ring, 11. Lower coil, 12. Lower coil frame, 13. Lower fixed iron core, 14. Moving iron core, 14a. Oil passage hole C, 14b. Radial through hole, 15. Valve core, 16. Valve seat, 17. Oil outlet hole, 18. Valve sleeve receiving cavity. 9. Oil inlet hole; 20. Large disc section A; 21. Small cylindrical section A; 22. Large diameter oil passage hole A; 23. Small diameter oil passage hole A; 24. Annular mounting groove A; 25. Oil passage hole B; 26. Annular groove B; 27. Annular mounting groove B; 28. Oil passage hole D; 29. ​​Annular groove A; 30. Small cylindrical section B; 31. Large cylindrical section one; 32. Conical section; 33. Small cylindrical section one; 34. Large disc section B; 35. Stepped hole; 36. Annular partition. Detailed Implementation

[0029] The invention will now be further described with reference to the accompanying drawings.

[0030] like Figures 1 to 10 As shown, the present invention provides a high-speed switching valve driven by dual electromagnets, including a valve body 2, a pressure cap 1, a magnetic valve sleeve 3, a lower electromagnet assembly, a valve core assembly, and an upper electromagnet assembly.

[0031] The valve body 2 has an axially extending valve sleeve receiving space at its axis. The lower end of the valve sleeve receiving space extends to a position close to the lower end face of the valve body 2 and communicates with the outside through an oil outlet hole 17 opened at the center of the lower end of the valve body 2. The upper end of the valve sleeve receiving space extends to the upper end face of the valve body 2 and has an internal thread on the inner side of the upper end.

[0032] The size of the pressure cap 1 is adapted to the size of the valve sleeve receiving space. Its outer circular surface is provided with external threads. The pressure cap 1 is fixedly connected to the upper end of the valve sleeve receiving space through threaded connection, and seals the upper end of the valve sleeve receiving space to form the valve sleeve receiving cavity 18. The upper end of the valve sleeve receiving cavity 18 is connected to the outside through the oil inlet hole 19 opened in the center of the pressure cap 1.

[0033] The outer diameter of the magnetic valve sleeve 3 is adapted to the size of the valve sleeve receiving cavity 18, and it is pressed and fixed in the valve sleeve receiving cavity 18 by the pressure cap 1. The inner side of the upper end and the inner side of the lower end of the magnetic valve sleeve 3 are provided with internal threads.

[0034] The lower electromagnet assembly is located at the bottom of the valve sleeve receiving cavity 18, and includes a lower fixed iron core 13, a lower coil frame 12, a lower coil 11, and a lower magnetic ring 10. The lower fixed iron core 13 consists of a large circular disc segment A20 and a small cylindrical segment A21 coaxially fixedly connected to the upper central area of ​​the large circular disc segment A20. A stepped hole 35 is axially opened at the axis of the lower fixed iron core 13. The outer surface of the large circular disc segment A20 is provided with external threads and is fixedly connected to the lower end of the magnetic valve sleeve 3 by threaded engagement. A lower annular receiving space is formed between the small cylindrical segment A21 and the magnetic valve sleeve 3. The stepped hole 35 consists of a large-diameter oil passage hole A22 located at the top and a small-diameter oil passage hole A23 located at the bottom. The inner diameter of the small-diameter oil passage hole A22 is adapted to the size of the oil outlet hole 17, and it is consistent with the oil outlet hole. 17 are connected; the lower coil frame 12 is annular, and its size is adapted to the size of the lower annular mounting cavity. The lower coil frame 12 is pressed by the small cylindrical segment A21 on the inner side of the magnetic valve sleeve 3, and its lower end face is sealed to the upper end face of the large disc segment A20. Its upper end face is higher than the upper end face of the lower fixed iron core 13. The lower coil frame 12 is provided with an annular mounting groove A24 in the outer circumferential direction. The opening end of the annular mounting groove A24 extends to the outer circular surface of the lower coil frame 12. The lower coil 11 is wound on the lower coil frame 12 and located in the annular mounting groove A24. The size of the lower magnetic ring 10 matches the size of the lower coil frame 12. It is coaxially mounted on the upper end of the lower coil frame 12, and its lower end face is sealed to the upper end face of the lower coil frame 12.

[0035] The valve core assembly includes a valve seat 16, an iron core ring seat 8, a moving iron core 14, a guide roller 9, and a valve core 15. The valve seat 16 is a stepped shaft adapted to the stepped hole 35, with an axially penetrating oil passage B25 at its center. The upper inner side of the oil passage B25 has an inverted frustum-shaped bevel. The valve seat 16 is fixedly inserted into the stepped portion of the stepped hole 35, and its upper end is lower than the upper end of the stepped hole 35. The iron core ring seat 8 is annular, and its outer diameter matches the inner diameter of the magnetic valve sleeve 3. Multiple pairs of ball grooves 8a are spaced vertically along the ring inside, with annular partitions 36 between the multiple pairs of ball grooves 8a. The radial direction of the multiple pairs of ball grooves 8a... The opening end extends to the inner circular surface of the iron core ring seat 8, and its axial opening end extends to the axial end face of the iron core ring seat 8. The cross-section of the ball groove 8a is adapted to the guide roller 9. The outer diameter of the moving iron core 14 is smaller than the inner diameter of the annular partition 36. It is inserted into the inner cavity of the iron core ring seat 8. An annular groove B26 is formed in the middle of its outer surface. The annular groove B26 corresponds to multiple pairs of ball grooves 8a, and its height meets the vertical sliding stroke requirements of the moving iron core 14. Since the outer diameter of the moving iron core 14 is smaller than the inner diameter of the annular partition 36, an oil space can be formed between the two to facilitate the entry of oil. An axial through-hole is formed at the axis of the moving iron core 14. The oil passage hole C14a has an annular groove A29 on the outer side of the lower end of the oil passage hole C14a. The inner diameter of the annular groove A29 is smaller than the inner diameter of the large-diameter oil passage hole A22. The middle part of the oil passage hole C14a is connected to the outside of the moving iron core 14 through four radial through holes 14b opened on the moving iron core 14. Multiple pairs of guide rollers 9 are nested in multiple pairs of ball grooves 8a respectively. The valve core 15 is stepped, which consists of a large cylindrical section 31 at the upper end, a conical section 32 at the lower end, and a small cylindrical section 33 that transitions between the conical section 32 and the large cylindrical section 31. The size of the large cylindrical section 31 is adapted to the size of the annular groove A29. The valve core assembly is fixedly inserted into the annular groove A29; the taper of the conical section 32 is the same as the taper of the bevel; the valve core assembly is installed in the middle of the valve sleeve receiving cavity 18, and the lower end face of the iron core ring seat 8 is sealed to the upper end face of the lower magnetic ring 10. The lower opening ends of the multiple ball grooves 8a located on the lower side are blocked by the lower magnetic ring 10. The lower end of the moving iron core 14 abuts against the upper end of the lower fixed iron core 13. The conical section 32 cooperates with the upper end of the oil passage hole B25, which is used to open or close the oil passage hole B25 during axial movement. In this way, the valve core 15 and the valve seat 16 form a pair of sealing assemblies, which can be opened or closed as needed.

[0036] The upper electromagnet assembly is located at the top of the valve sleeve receiving cavity 18, and includes an upper fixed iron core 4, an upper magnetic ring 7, an upper coil frame 5, and an upper coil 6. The upper fixed iron core 4 is composed of a large circular disc segment B34 and a small cylindrical segment B30 coaxially fixedly connected to the lower center area of ​​the large circular disc segment B34. An oil passage hole D28 is opened at the axis of the upper fixed iron core 4. The outer surface of the large circular disc segment B34 is provided with external threads, and it is fixedly connected to the inner side of the upper end of the magnetic valve sleeve 3 through threaded engagement, and the upper end face of the large circular disc segment B34 is sealed to the lower end face of the pressure cover 1. As a preferred embodiment, the outer diameter of the small cylindrical segment B30 is the same as the outer diameter of the small cylindrical segment A21, the distance between the lower end of the small cylindrical segment B30 and the upper end of the small cylindrical segment A21 is greater than the length of the moving iron core 14, and an upper annular receiving space is formed between the small cylindrical segment B30 and the magnetic valve sleeve 3; the size of the upper magnetic ring 7 is the same as that of the upper magnetic ring 6. The lower magnetic ring 10 is sized to match the upper core ring seat 8 and is coaxially mounted on the upper end of the core ring seat 8. The lower end face of the upper magnetic ring 7 is sealed to the upper end face of the core ring seat 8 and blocks the upper opening ends of the multiple ball grooves 8a located on the upper side. The upper coil frame 5 is annular and its size is adapted to the size of the upper annular mounting cavity. The upper coil frame 5 is pressed against the inner side of the magnetic valve sleeve 3 by the small cylindrical section B30, and the upper end face of the upper coil frame 5 is sealed to the lower end face of the large disc section B34. The lower end face of the upper coil frame 5 is located below the lower end of the small cylindrical section B30 and is sealed to the upper end face of the upper magnetic ring 7. The upper coil frame 5 has an annular mounting groove B27 circumferentially opened on its outer side, and the opening end of the annular mounting groove B27 extends to the outer surface of the upper coil frame 5. The upper coil 6 is wound around the upper coil frame 5 and is located in the annular mounting groove B27.

[0037] The moving iron core 14, the upper magnetic ring 7, the upper fixed iron core 4, the lower magnetic ring 10, the lower fixed iron core 13, and the magnetic valve sleeve 3 are all made of soft magnetic material electrical pure iron.

[0038] To ensure assembly reliability, the valve core 15 and the moving iron core 14 are interference-fitted, and the valve seat 16 and the lower fixed iron core 13 are interference-fitted.

[0039] As a preferred embodiment, the oil inlet hole 19 and the oil outlet hole 17 have the same diameter.

[0040] As a preferred embodiment, sealing rings are installed between the lower end face of the pressure cap 1 and the upper end face of the large disc segment B34 of the upper fixed iron core 4, between the lower end face of the large disc segment B34 of the upper fixed iron core 4 and the upper end face of the upper coil frame 5, between the lower end face of the upper coil frame 5 and the upper end face of the upper magnetic ring 7, between the lower end face of the upper magnetic ring 7 and the upper end face of the iron core ring seat 8, between the lower end face of the iron core ring seat 8 and the upper end face of the lower magnetic ring 10, between the lower end face of the lower magnetic ring 10 and the upper end face of the lower coil frame 12, between the lower end face of the lower coil frame 12 and the upper end face of the large disc segment A20 of the lower fixed iron core 13, and between the lower end face of the large disc segment A20 of the lower fixed iron core 13 and the closed end of the valve sleeve accommodating space, and together they form a sealing group.

[0041] As a preferred option, the number of pairs of ball grooves 8a is 4, and they are arranged symmetrically along the axis of the moving iron core 14.

[0042] In this invention, multiple pairs of ball grooves are arranged vertically opposite each other inside the iron core ring seat, and guide rollers are embedded in them. The moving iron core is then inserted into the iron core ring seat, and an annular groove B is formed in the middle of the moving iron core to allow the guide rollers to roll axially. This allows the moving iron core to make indirect line contact with the iron core ring seat through the guide rollers, thus ensuring that the moving iron core is in a low-resistance state during movement. This low-resistance moving iron core structure effectively reduces the resistance during valve core movement, reducing wear on the valve core during operation and ensuring the valve core's alignment. The valve features stable coaxiality, significantly reducing oil leakage. The moving iron core, upper magnetic ring, upper fixed iron core, lower magnetic ring, lower fixed iron core, and magnetic valve sleeve are all made of soft magnetic electrical pure iron. The upper electromagnet assembly, valve core assembly, and lower electromagnet assembly are sequentially arranged inside the magnetic valve sleeve from top to bottom. Under the excitation of the upper coil, a closed upper magnetic flux loop is formed between the moving iron core, upper magnetic ring, upper fixed iron core, and magnetic valve sleeve. Simultaneously, under the excitation of the lower coil, a closed lower magnetic flux loop is formed between the moving iron core, lower magnetic ring, lower fixed iron core, and magnetic valve sleeve. A radial through-hole in the center of the moving iron core effectively connects the oil passage C at the shaft center of the moving iron core to the external space. This encompasses the oil passage to the gap between the iron core ring seat and the moving iron core, ensuring the entire interior of the valve is filled with oil, further reducing the resistance of the moving iron core during operation. Because the valve core is fixedly installed at the lower end of the moving iron core, and the lower end of the oil passage C is also blocked, when neither the upper nor lower electromagnet assembly is energized, the moving iron core is only subjected to the pressure of the oil injection entering through the oil inlet, thus pressing the valve core tightly against the valve seat and sealing the upper end of the oil passage B. This effectively ensures that the switching valve can be in a stable normally closed state when neither the upper nor lower electromagnet assembly is energized. The upper electromagnet assembly has an upper coil wound in the upper coil frame, and the lower electromagnet assembly has a lower coil wound in the lower coil frame. This dual-coil drive method, forming an upper and lower magnetic flux circuit, results in high-speed response performance of the switching valve. At the same time, this structure eliminates the small return spring, reducing the load resistance during valve core movement. While improving the response of the digital valve, it also effectively avoids fatigue damage to elastic elements. The structure is simple, safe, reliable, and easy to widely promote.

[0043] The work process is as follows:

[0044] When the switch valve is in the open state, the electromagnetic force provided by the upper electromagnet assembly is greater than the hydraulic pressure on the moving iron core 14.

[0045] like Figure 2As shown, when it is necessary to connect the oil inlet 19 (P port) and the oil outlet 17 (T port), the upper coil 6 is energized and the lower coil 11 is de-energized. The moving iron core 14, the upper magnetic ring 7, the upper fixed iron core 4, and the magnetic valve sleeve 3 form a closed upper magnetic flux circuit under the excitation of the upper coil 6. At this time, the electromagnetic force provided by the upper electromagnet assembly is greater than the oil pressure on the moving iron core 14. The moving iron core 14 is positively acted upon by the electromagnetic force and moves towards the oil inlet 19 (P port) against the oil pressure, causing the valve core 15 to separate from the valve seat 16, thereby opening the valve port of the switching valve and connecting the oil inlet 19 (P port) and the oil outlet 17 (T port).

[0046] like Figure 3 As shown, when the oil inlet 19 (P port) and oil outlet 17 (T port) need to be disconnected, the upper coil 6 is de-energized and the lower coil 11 is energized. The moving iron core 14, the lower magnetic ring 10, the lower fixed iron core 13, and the magnetic valve sleeve 3 form a closed lower magnetic flux circuit under the excitation of the lower coil 11. At this time, the moving iron core 14 is subjected to both oil pressure and electromagnetic force, causing it to move more quickly toward the oil outlet 17 (T port) until the valve core 15 seals with the valve seat 16, thereby closing the valve port of the switching valve and disconnecting the oil inlet 19 (P port) and oil outlet 17 (T port).

Claims

1. A high-speed switching valve driven by dual electromagnets, comprising a valve body (2); characterized in that, It also includes a pressure cap (1), a magnetic valve sleeve (3), a lower electromagnet assembly, a valve core assembly, and an upper electromagnet assembly; The valve body (2) has a valve sleeve receiving space extending axially at its axis. The lower end of the valve sleeve receiving space extends to a position close to the lower end face of the valve body (2) and communicates with the outside through an oil outlet hole (17) opened at the center of the lower end of the valve body (2). The upper end of the valve sleeve receiving space extends to the upper end face of the valve body (2) and has an internal thread on the inner side of the upper end. The size of the pressure cap (1) is adapted to the size of the valve sleeve accommodating space. Its outer circular surface is provided with external threads. The pressure cap (1) is fixedly connected to the upper end of the valve sleeve accommodating space through threaded connection, and the upper end of the valve sleeve accommodating space is sealed to form a valve sleeve accommodating cavity (18). The upper end of the valve sleeve accommodating cavity (18) is connected to the outside through an oil inlet hole (19) opened in the center of the pressure cap (1). The outer diameter of the magnetic valve sleeve (3) is adapted to the size of the valve sleeve receiving cavity (18), and it is pressed and fixed in the valve sleeve receiving cavity (18) by the pressure cap (1). The inner side of the upper end and the inner side of the lower end of the magnetic valve sleeve (3) are provided with internal threads. The lower electromagnet assembly is located at the bottom of the valve sleeve receiving cavity (18), and includes a lower fixed iron core (13), a lower coil skeleton (12), a lower coil (11) and a lower magnetic ring (10). The lower fixed iron core (13) is composed of a large circular disk section A (20) and a small cylindrical section A (21) coaxially fixedly connected to the upper center area of ​​the large circular disk section A (20). A stepped hole (35) is axially opened at the axis of the lower fixed iron core (13). The outer surface of the large disc segment A (20) is provided with external threads, and is fixedly connected to the lower end of the magnetic valve sleeve (3) by threaded connection; a lower annular receiving space is formed between the small cylindrical segment A (21) and the magnetic valve sleeve (3); the stepped hole (35) is composed of a large-diameter oil passage hole A (22) located at the upper part and a small-diameter oil passage hole A (23) located at the lower part. The inner diameter of the small-diameter oil passage hole A (23) is adapted to the size of the oil outlet hole (17), and it is consistent with... The oil outlet (17) is connected; the lower coil frame (12) is annular, and its size is adapted to the size of the lower annular mounting cavity. The lower coil frame (12) is pressed by the small cylindrical section A (21) on the inner side of the magnetic valve sleeve (3), and its lower end face is sealed to the upper end face of the large disc section A (20). Its upper end face is higher than the upper end face of the lower fixed iron core (13); the lower coil frame (12) is provided with an annular mounting groove A (24) in the outer circumferential direction. The opening end of the annular mounting groove A (24) extends to the outer circular surface of the lower coil frame (12); the lower coil (11) is wound on the lower coil frame (12) and located in the annular mounting groove A (24); the size of the lower magnetic ring (10) matches the size of the lower coil frame (12). It is coaxially mounted on the upper end of the lower coil frame (12), and its lower end face is sealed to the upper end face of the lower coil frame (12). The valve core assembly includes a valve seat (16), an iron core ring seat (8), a moving iron core (14), guide rollers (9), and a valve core (15). The valve seat (16) is a stepped shaft adapted to the stepped hole (35), and its axis has an axially penetrating oil passage B (25). The upper inner side of the oil passage B (25) is provided with an inverted frustum-shaped bevel. The valve seat (16) is fixedly inserted into the stepped part of the stepped hole (35), and its upper end is lower than the upper end of the stepped hole (35). The iron core ring seat (8) is annular, and its outer diameter matches the inner diameter of the magnetic valve sleeve (3). Multiple pairs of ball grooves (8a) are opened at intervals along the ring. An annular partition (36) is provided between the two parts. The radial opening ends of multiple pairs of ball grooves (8a) extend to the inner circular surface of the iron core ring seat (8), and their axial opening ends extend to the axial end face of the iron core ring seat (8). The cross-section of the ball groove (8a) is adapted to the guide roller (9). The outer diameter of the moving iron core (14) is smaller than the inner diameter of the annular partition (36). It is inserted into the inner cavity of the iron core ring seat (8). An annular groove B (26) is provided in the middle of its outer surface. The annular groove B (26) corresponds to multiple pairs of ball grooves (8a). Its height meets the vertical sliding stroke requirements of the moving iron core (14). An axially penetrating oil hole C is provided at the axis of the moving iron core (14). (14a), and an annular groove A (29) is provided on the outer side of the lower end of the oil passage C (14a). The inner diameter of the annular groove A (29) is smaller than the inner diameter of the large diameter oil passage A (22). The middle part of the oil passage C (14a) is connected to the outside of the moving iron core (14) through four radial through holes (14b) opened on the moving iron core (14); multiple pairs of guide rollers (9) are nested in multiple pairs of ball grooves (8a); the valve core (15) is stepped, which consists of a large cylindrical section (31) at the upper end, a conical section (32) at the lower end, and a small cylindrical section (33) that connects the conical section (32) and the large cylindrical section (31); the large cylindrical section The dimensions of one (31) are adapted to the dimensions of the annular groove A (29) and are fixedly inserted into the annular groove A (29); the taper of the conical section (32) is the same as the taper of the bevel; the valve core assembly is installed in the middle of the valve sleeve receiving cavity (18), and the lower end face of the iron core ring seat (8) is sealed to the upper end face of the lower magnetic ring (10); the lower opening ends of the multiple ball grooves (8a) located on the lower side are blocked by the lower magnetic ring (10); the lower end of the moving iron core (14) abuts against the upper end of the lower fixed iron core (13); the conical section (32) cooperates with the upper end of the oil passage hole B (25) for opening or closing the oil passage hole B (25) during axial movement; The upper electromagnet assembly is located at the top of the valve sleeve receiving cavity (18), and includes an upper fixed iron core (4), an upper magnetic ring (7), an upper coil frame (5), and an upper coil (6). The upper fixed iron core (4) is composed of a large circular disk section B (34) and a small cylindrical section B (30) coaxially fixedly connected to the lower center area of ​​the large circular disk section B (34). An oil passage hole D (28) is opened at the axis of the upper fixed iron core (4); the outer surface of the large circular disk section B (34) is provided with external threads. And it is fixedly connected to the inner side of the upper end of the magnetic valve sleeve (3) by threaded connection, and the upper end face of the large disc section B (34) is sealed to the lower end face of the pressure cap (1); the distance between the lower end of the small cylindrical section B (30) and the upper end of the small cylindrical section A (21) is greater than the length of the moving iron core (14), and the small cylindrical section B (30) and the magnetic valve sleeve (3) form an upper annular receiving space; the size of the upper magnetic ring (7) matches the size of the lower magnetic ring (10), It is coaxially mounted on the upper end of the iron core ring seat (8), and the lower end face of the upper magnetic ring (7) is sealed to the upper end face of the iron core ring seat (8), and the upper opening ends of the multiple ball grooves (8a) located on the upper side are blocked; the upper coil frame (5) is annular, and its size is adapted to the size of the upper annular mounting cavity. The upper coil frame (5) is pressed by the small cylindrical section B (30) on the inner side of the magnetic valve sleeve (3), and the upper end face of the upper coil frame (5) is connected to the large disc section B (30). 4) The lower end face of the upper coil frame (5) is sealed and connected with the lower end face of the small cylindrical section B (30), and is sealed and connected with the upper end face of the upper magnetic ring (7); the outer circumferential opening of the upper coil frame (5) is provided with an annular mounting groove B (27), and the opening end of the annular mounting groove B (27) extends to the outer surface of the upper coil frame (5); the upper coil (6) is wound on the upper coil frame (5) and located in the annular mounting groove B (27); The moving iron core (14), upper magnetic ring (7), upper fixed iron core (4), lower magnetic ring (10), lower fixed iron core (13) and magnetic valve sleeve (3) are all made of soft magnetic material electrical pure iron.

2. The high-speed switching valve driven by dual electromagnets according to claim 1, characterized in that, The valve core (15) and the moving iron core (14) are interference-fitted, and the valve seat (16) and the lower fixed iron core (13) are interference-fitted.

3. A high-speed switching valve driven by dual electromagnets according to claim 1 or 2, characterized in that, The oil inlet (19) and the oil outlet (17) have the same diameter.

4. A high-speed switching valve driven by dual electromagnets according to claim 3, characterized in that, Sealing rings are installed between the lower end face of the pressure cap (1) and the upper end face of the large disc segment B (34) of the upper fixed iron core (4), between the lower end face of the large disc segment B (34) of the upper fixed iron core (4) and the upper end face of the upper coil frame (5), between the lower end face of the upper coil frame (5) and the upper end face of the upper magnetic ring (7), between the lower end face of the upper magnetic ring (7) and the upper end face of the iron core ring seat (8), between the lower end face of the iron core ring seat (8) and the upper end face of the lower magnetic ring (10), between the lower end face of the lower magnetic ring (10) and the upper end face of the lower coil frame (12), between the lower end face of the lower coil frame (12) and the upper end face of the large disc segment A (20) of the lower fixed iron core (13), and between the lower end face of the large disc segment A (20) of the lower fixed iron core (13) and the closed end of the valve sleeve accommodating space, and together they form a sealing group.

5. A high-speed switching valve driven by dual electromagnets according to claim 4, characterized in that, The number of pairs of ball grooves (8a) is 4, and they are arranged symmetrically along the axis of the moving iron core (14).

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