Electromagnetic valve

Abstract

The invention discloses an electromagnetic valve which comprises a valve body, a first valve element assembly and a second valve element assembly. A first mounting cavity and a second mounting cavity which are physically isolated are formed in the valve body. The two valve element assemblies are both of a straight pull type stop valve structure and control connection and disconnection of corresponding gas circuits respectively. The first valve element assembly is used for vacuum adsorption and holding, and a first closing pad of the first valve element assembly directly opens and closes a first channel. The second valve element assembly is used for breaking vacuum under positive pressure, and through linkage of the movable part and the shaft core, the two-step opening action that a small-flow third channel is firstly opened for pressure relief, and then a main second channel is opened is achieved. A stop valve structure without grease lubrication is adopted, so that the problem of clamping stagnation of the slide valve caused by dust invasion is avoided; the double-cavity isolation design prevents cross contamination; the straight pull type electromagnetic drive ensures quick and stable response under low voltage. The valve is particularly suitable for high-dust and high-frequency working conditions such as lithium battery lamination and the like, and has the advantages of long service life and high reliability.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and more specifically to a solenoid valve. Background Technology

[0002] In automated processes such as lithium battery lamination, solenoid valves are often used to achieve vacuum adsorption, holding, and positive pressure air release of the electrodes. This application scenario is characterized by high-frequency operation, high levels of environmental dust (such as toner), and requirements for rapid response and long lifespan.

[0003] Currently, most valves used for this function on the market are three-position five-way pilot-operated solenoid valves (such as the type disclosed in CN115929720A). These valves typically employ a spool valve structure, where the valve stem slides within the valve chamber to achieve pneumatic path switching. They have the following inherent drawbacks: 1. Poor dust resistance: The valve stem and valve chamber of a spool valve require a precise shaft-hole fit clearance and rely on grease lubrication to reduce friction and wear. Dust can easily enter this clearance, causing valve stem jamming, malfunction, and seal failure, seriously affecting product lifespan and reliability.

[0004] 2. Dependence on air source pressure: As a pilot-operated valve, the operation of its main valve core depends on the pressure drive of the pilot air circuit. When the system air pressure is too low or unstable, the valve may fail to operate normally, and the response time may be unstable.

[0005] 3. Cross-contamination due to interconnected chambers: The positive pressure control chamber and vacuum control chamber are usually designed to be interconnected. When vacuum adsorbing dust such as carbon powder, the dust can easily enter the valve and diffuse into the positive pressure chamber, exacerbating wear and the risk of jamming.

[0006] Therefore, it is necessary to provide a new type of solenoid valve to solve the above-mentioned technical problems. Summary of the Invention

[0007] The purpose of this invention is to address the shortcomings of existing technologies by providing a solenoid valve. This solenoid valve adopts a direct-pull shut-off valve structure and has the advantages of being grease-free, dust-resistant, having a fast response, stable operation, and long service life. It is particularly suitable for high-dust, high-frequency industrial applications such as lithium battery stacking.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: An electromagnetic valve includes a valve body, a first valve core assembly, and a second valve core assembly. The valve body contains a first mounting cavity and a second mounting cavity, physically isolated from each other, with no direct fluid passage connecting the two cavities. The first valve core assembly is securely mounted to one side of the valve body and extends into the first mounting cavity. It is a direct-pull shut-off valve structure driven directly by electromagnetic force, used to control the opening and closing of a first air passage connecting to the first mounting cavity. The second valve core assembly is securely mounted to the other side of the valve body and extends into the second mounting cavity. It is also a direct-pull shut-off valve structure driven directly by electromagnetic force, used to control the opening and closing of a second air passage connecting to the second mounting cavity. Both the first and second valve core assemblies include a moving iron core and a sealing gasket disposed at the front end of the moving iron core. The valve body contains a column that corresponds to and cooperates with the sealing gasket to form an end-face seal. The overall internal structure of the electromagnetic valve is designed to be grease-free and lubricated.

[0009] Furthermore, the first mounting cavity has a first pillar at its inner end, on which a first channel is formed; the second mounting cavity has a second pillar at its inner end, on which a second channel is formed. The front end of the first valve core assembly has a first sealing gasket for abutting against or moving away from the first pillar to close or open the first channel; the front end of the second valve core assembly has a second sealing gasket provided through a movable member for abutting against or moving away from the second pillar to close or open the second channel.

[0010] Furthermore, the valve body is provided with a first external connection hole, a second external connection hole, a third external connection hole, and a fourth external connection hole. The first external connection hole connects to a first channel, and the second external connection hole connects to a first mounting cavity, forming the first air passage. The third external connection hole connects to a second mounting cavity, and the fourth external connection hole connects to a second channel, forming the second air passage.

[0011] Furthermore, the second valve core assembly also includes a shaft, a limiting member, a movable member, and a third sealing gasket. The movable member is slidably disposed within the second mounting cavity, and the second mounting cavity is divided into a first compartment and a second compartment by an eighth and a ninth sealing ring. The second sealing gasket is installed at the front end of the movable member, and a third channel connecting the first compartment and the second channel is provided at its center. The third sealing gasket is installed at the front end of the shaft, and the third channel can be controlled to close or open. A bypass channel is provided on the valve body, connecting the third external connection hole and the second compartment.

[0012] Furthermore, when the second valve core assembly is energized, its moving iron core retracts, first pulling the shaft core to open the third channel for pressure relief, and then the limiting member pulls the movable part back to open the second channel, achieving dual-channel gas supply. When the power is off, under the action of the spring, the third sealing pad closes the third channel first, and then the second sealing pad closes the second channel.

[0013] Furthermore, both the first valve core assembly and the second valve core assembly include a stationary iron core, a moving iron core, a coil, a magnetic conductor, and a return spring. When the coil is energized, a magnetic attraction force is generated between the stationary iron core and the moving iron core, which directly overcomes the spring force and pulls the moving iron core and the connected closed assembly to move, opening the corresponding channel.

[0014] Furthermore, the ends of both the first and second pillars can be formed into conical portions, and the corresponding sealing gaskets can be embedded in the conical portions to enhance the sealing effect.

[0015] Furthermore, the solenoid valve is applied in the lithium battery stacking process, wherein the first gas path is used to control vacuum adsorption and holding, and the second gas path is used to control positive pressure vacuum breaking. The physical isolation between the first mounting cavity and the second mounting cavity effectively prevents dust adsorbed on the vacuum side from migrating to the positive pressure side.

[0016] The beneficial effects of this invention are as follows: 1. Strong dust resistance and long service life: Adopting a direct pull stop valve structure, the valve core does not require precise sliding fit and the whole is designed without grease, which fundamentally avoids the jamming problem caused by dust intrusion, and significantly improves the working life and reliability of the valve in dusty environments.

[0017] 2. Fast and stable response, independent of air pressure: It adopts direct electromagnetic force drive, without the need for pilot air pressure, and can operate reliably even under working conditions with low or unstable air pressure. The response time is fast and constant.

[0018] 3. Cavity isolation to avoid cross-contamination: The first installation cavity (vacuum cavity) and the second installation cavity (positive pressure cavity) are physically isolated, which effectively prevents dust from spreading from the vacuum side to the positive pressure side, improving the cleanliness and stability of the system.

[0019] 4. Optimized structure and smooth operation: The second valve core assembly adopts a two-step switching design (first open / close the small flow bypass, then open / close the main channel), which can effectively reduce the starting impact and required power, making the switching operation smoother and further improving valve efficiency and life.

[0020] 5. Reliable sealing: The vacuum adsorption force can enhance the sealing effect when the vacuum is maintained; the positive pressure can enhance the sealing pressure when the vacuum circuit is closed, resulting in excellent sealing performance. Attached Figure Description

[0021] Figure 1 This is a cross-sectional view of the solenoid valve of the present invention. Figure 2 This is an exploded structural diagram of the electromagnetic valve of the present invention; Figure 3 This is a three-dimensional structural diagram of the solenoid valve of the present invention; Figure 4 This is a cross-sectional view of the valve body of the present invention; Figure 5 This is an exploded structural diagram of the first valve core assembly of the present invention; Figure 6 This is an exploded structural diagram of the second valve core assembly of the present invention.

[0022] Illustration: 1. Valve body; 2. First valve core assembly; 3. Second valve core assembly; 4. First mounting cavity; 5. Second mounting cavity; 6. First support; 7. First channel; 8. Second support; 9. Second channel; 10. First external connection hole; 11. Second external connection hole; 12. Third external connection hole; 13. Fourth external connection hole; 14. First valve housing; 15. First electronic control board; 16. First stationary iron core; 17. First coil; 18. First coil post; 19. First magnetic conductor; 20. First spring; 21. First moving iron core; 22. First sealing gasket; 23. First gasket 24. First dust cover; 25. First sealing ring; 26. Second sealing ring; 27. Third sealing ring; 28. First gap; 29. ​​First stepped seat; 30. Second gap; 31. First mounting seat; 32. Fourth sealing ring; 33. First mounting groove; 34. First stepped groove; 35. Second mounting groove; 36. Third mounting groove; 37. Second stepped groove; 38. Fourth mounting groove; 39. Fifth mounting groove; 40. Second mounting seat; 41. First fastener; 42. Second valve body; 43. Second electrical control board; 44. Second stationary iron core; 45. 46. ​​Second coil; 47. Second coil post; 48. Second magnetic conductor; 49. Second washer; 50. Second spring; 51. Second moving iron core; 52. Shaft core; 53. Limiting component; 54. Third washer; 55. Moving component; 56. Second sealing gasket; 57. Third sealing gasket; 58. Second dust cover; 59. Fifth sealing ring; 60. Sixth sealing ring; 61. Seventh sealing ring; 62. Third gap; 63. Eighth sealing ring; 64. Ninth sealing ring; 65. First compartment; 66. Second compartment; 67. Third mounting base; 68. Second cone 68. Third channel; 69. Third conical part; 70. Bypass channel; 71. Fourth mounting seat; 72. Tenth sealing ring; 73. Sixth mounting groove; 74. Third stepped groove; 75. Fifth mounting seat; 76. Seventh mounting groove; 77. Second stepped seat; 78. Fourth gap; 79. Fifth gap; 80. First conical part; 81. Ninth mounting groove; 82. Tenth mounting groove; 83. Eleventh mounting groove; 84. Twelfth mounting groove; 85. Fourth stepped groove; 86. Thirteenth mounting groove; 87. Sixth mounting seat; 88. Second fastener. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0025] Furthermore, in the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components; they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figure 1-6 This invention provides a solenoid valve, comprising a valve body 1, a first valve core assembly 2, and a second valve core assembly 3. The valve body 1 has a first mounting cavity 4 and a second mounting cavity 5, which are structurally isolated from each other. The first mounting cavity 4 and the second mounting cavity 5 are physically separated by the solid structural wall of the valve body 1, and there is no direct fluid channel connecting the two cavities. The first valve core assembly 2 is fastened to one side of the valve body 1 and extends into the first mounting cavity 4. The first valve core assembly 2 is a direct-pull shut-off valve structure directly driven by electromagnetic force. The second valve core assembly 3 is fastened to the other side of the valve body 1 and extends into the second mounting cavity 5. The second valve core assembly 3 is also a direct-pull shut-off valve structure directly driven by electromagnetic force. The first valve core assembly 2 controls the opening and closing of a first air passage connecting to the first mounting cavity 4, and the second valve core assembly 3 controls the opening and closing of a second air passage connecting to the second mounting cavity 5. The overall internal structure of the solenoid valve is designed without grease lubrication, meaning that the solenoid valve of this invention does not require additional grease lubrication.

[0028] The inner end of the first mounting cavity 4 protrudes outward to form a first pillar 6, and a first channel 7 is formed on the first pillar 6, which connects to the first mounting cavity 4. The inner end of the second mounting cavity 5 protrudes outward to form a second pillar 8, and a second channel 9 is formed on the second pillar 8, which connects to the second mounting cavity 5. The front end of the first valve core assembly 2 can abut against or move away from the first pillar 6, thereby closing or opening the first channel 7 to achieve the opening and closing of the first air passage. The front end of the second valve core assembly 3 can abut against or move away from the second pillar 8, thereby closing or opening the second channel 9 to achieve the opening and closing of the second air passage.

[0029] The valve body 1 is provided with a first external connection hole 10 and a second external connection hole 11. The first external connection hole 10 is connected to the first channel 7, and the second external connection hole 11 is connected to the first mounting cavity 4. Thus, when the first valve core assembly 2 is in the open state, the first external connection hole 10, the first channel 7, the first mounting cavity 4 and the second external connection hole 11 can form a smooth channel. When the first valve core assembly 2 is in the closed state, the first channel 7 and the first mounting cavity 4 are isolated.

[0030] The valve body 1 is also provided with a third external hole 12 and a fourth external hole 13. The third external hole 12 is connected to the second mounting cavity 5, and the fourth external hole 13 is connected to the second channel 9. Thus, when the second valve core assembly 3 is in the open state, the third external hole 12, the second mounting cavity 5, the second channel 9 and the fourth external hole 13 can form a smooth channel. When the second valve core assembly 3 is in the closed state, the second channel 9 and the second mounting cavity 5 are isolated.

[0031] The first valve core assembly 2 includes a first valve housing 14, a first electrical control board 15, a first stationary iron core 16, a first coil 17, a first coil post 18, a first magnetic conductor 19, a first spring 20, a first moving iron core 21, a first sealing gasket 22, and a first washer 23. The first electrical control board 15 is fixedly installed on the outer rear end of the first valve housing 14 and encapsulated with the first valve housing 14 by a first dust cover 24. The first coil 17 is wound around the first coil post 18, the center of which has a through structure. The first coil post 18 is installed inside the first valve housing 14 and abuts against the rear end of the first valve housing 14. The first stationary iron core 16 is fixedly installed inside the first valve housing 14 and extends into the through structure of the first coil post 18. The first coil 17 is electrically connected to the first electrical control board 15. A first sealing ring 25 is disposed on the first stationary iron core 16 to form a compression seal with the inner wall of the through structure of the first coil post 18. A first magnetic conductor 19 is fitted onto the front end of the first coil post 18. The first magnetic conductor 19 is equipped with a second sealing ring 26 and a third sealing ring 27 to form a compression seal with the front end face of the first coil post 18. The second sealing ring 26 seals the axial end face of the first coil post 18, and the third sealing ring 27 seals the radial end face of the first coil post 18. A first spring 20 is installed at the front end of the first magnetic conductor 19. A first washer 23 passes through the rear end of the first moving iron core 21 and is inserted into the front end of the through-hole structure of the first coil post 18, causing the first moving iron core 21 to abut against the first spring 20. A first gap 28 is formed between the rear end face of the first moving iron core 21 and the front end face of the first stationary iron core 16. The first gap 28 is used to allow the first moving iron core 21 to retract and open the first channel 7. A first stepped seat 29 is provided on the rear side of the front end of the first moving iron core 21, and the first washer 23 is installed on the first stepped seat 29 to prevent the first moving iron core 21 from directly impacting the first magnetic conductor 19 during its retraction. A second gap 30 exists between the rear end face of the first washer 23 and the front end face of the first magnetic conductor 19. The second gap 30 is smaller than the first gap 28. The second gap 30 should be sufficient to fully open the first channel 7 when the first moving iron core 21 retracts. The first washer 23 is made of impact-resistant material to ensure the long service life of the first moving iron core 21 and the first magnetic conductor 19, thereby improving the overall lifespan and product quality of the first valve core assembly 2. The first sealing gasket 22 is fixedly fitted onto the front end of the first moving iron core 21. It is made of rubber or silicone material. The first sealing gasket 22 is used to seal the first channel 7 when the first valve core assembly 2 is in the closed state, thereby isolating the first mounting cavity 4 and the first channel 7.

[0032] A first mounting base 31 is provided at the rear end of the first mounting cavity 4, which is used to securely mount the first magnetic conductor 19. A fourth sealing ring 32 is disposed on the first magnetic conductor 19, which is used to form a compression seal with the inner sidewall of the first mounting base 31. A first mounting groove 33 is provided on the front end face of the first magnetic conductor 19, and a first stepped groove 34 is formed on the front end of the first moving iron core 21. The first stepped groove 34 and the first mounting groove 33 are used to securely mount the first spring 20. A second mounting groove 35 is formed on the front end of the first moving iron core 21, which is used to securely mount the first sealing gasket 22. A third mounting groove 36 is provided on the outer diameter surface of the first magnetic conductor 19, which is used to securely mount the fourth sealing ring 32. A second stepped groove 37 and a fourth mounting groove 38 are provided on the front end of the first coil post 18. The second stepped groove 37 is used to securely mount the third sealing ring 27, and the fourth mounting groove 38 is used to securely mount the second sealing ring 26. The first stationary iron core 16 has a fifth mounting groove 39 on its outer diameter surface, which is used to securely mount the first sealing ring 25. A second mounting seat 40 is provided at the rear end of the first valve body 14, which is used to securely mount the first stationary iron core 16. The first valve core assembly 2 is fastened to the valve body 1 by a first fastener 41, preferably a bolt.

[0033] After the first valve core assembly 2 is energized, when the first control board 15 is energized in a timely manner according to an external signal command, the first coil 17 is energized to form a magnetic field. The first magnetic conductor 19 strengthens the magnetic field, and the first stationary iron core 16 and the first moving iron core 21 form opposite magnetic poles on both sides of the first gap 28, thereby generating magnetic attraction. The first stationary iron core 16 remains stationary, and the first moving iron core 21 is magnetically attracted and moves backward, compressing the first spring 20, thereby opening the first channel 7. After the first washer 23 reaches the first magnetic conductor 19, the first moving iron core 21 stops moving and remains stationary, and the fluid can flow sequentially through the first external hole 10, the first channel 7, the first mounting cavity 4, and the second external hole 11. When the first control board 15 is de-energized in a timely manner according to an external signal command, the magnetic field on the first coil 17 disappears, the first spring 20 resets, and the force of the first spring 20 pushes the first moving iron core 21 to reset, causing the first sealing pad 22 to move forward and close the first channel 7. Preferably, the rear end of the first column 6 is formed as a first conical portion 80, which can be embedded in the first sealing pad 22 to improve the sealing effect.

[0034] The second valve core assembly 3 includes a second valve housing 42, a second electrical control board 43, a second stationary iron core 44, a second coil 45, a second coil post 46, a second magnetic conductor 47, a second washer 48, a second spring 49, a second moving iron core 50, a shaft core 51, a limiting member 52, a third washer 53, a movable member 54, a second sealing gasket 55, and a third sealing gasket 56. The second electrical control board 43 is fixedly installed on the outer rear end of the second valve housing 42 and encapsulated with the second valve housing 42 by a second dust cover 57. The second coil 45 is wound around the second coil post 46, the center of which has a through structure. The second coil post 46 is installed inside the second valve housing 42 and abuts against the rear end of the second valve housing 42. The second stationary iron core 44 is fixedly installed inside the second valve housing 42 and extends into the through structure of the second coil post 46. The second coil 45 is electrically connected to the second electrical control board 43. A fifth sealing ring 58 is disposed on the second stationary iron core 44 to form a compression seal with the inner wall of the through structure of the second coil post 46. A second magnetic conductor 47 is fitted onto the front end of the second coil post 46. The second magnetic conductor 47 is disposed on a sixth sealing ring 59 and a seventh sealing ring 60 to form a compression seal with the front end face of the second coil post 46. The sixth sealing ring 59 seals the radial end face of the second coil post 46, and the seventh sealing ring 60 seals the axial end face of the second coil post 46. A second washer 48 is installed on the front side of the second magnetic conductor 47, and the front side of the second washer 48 abuts against the inner end face of the second mounting cavity 5. A second spring 49 is installed at the front end of the second washer 48. The rear end of the second moving iron core 50 passes through the second washer 48 and is inserted into the front end of the through structure of the second coil post 46, causing the second moving iron core 50 to abut against the second spring 49. A third gap 61 is formed between the rear end face of the second moving iron core 50 and the front end face of the second stationary iron core 44. The third gap 61 is used to allow the second moving iron core 50 to open the second channel 9 by retracting. A third washer 53 is fitted onto the front end of the shaft core 51, and a limiting member 52 is fitted onto the rear side of the third washer 53. The rear end of the shaft core 51 is threadedly connected to the front end of the second moving iron core 50. A movable member 54 is threadedly fixedly fitted onto the outer surface of the limiting member 52. A second sealing pad 55 is securely installed at the front end of the movable member 54. The second sealing pad 55 can close or open the second channel 9. The movable member 54 is located inside the second mounting cavity 5. An eighth sealing ring 62 and a ninth sealing ring 63 are configured on the movable member 54. The eighth sealing ring 62 and the ninth sealing ring 63 are used to separate the second mounting cavity 5 into a first compartment 64 and a second compartment 65. The two sealing rings ensure the stability of the sealing and separation.

[0035] The front end of the movable part 54 is formed as a third mounting base 66, which is used to securely mount the second sealing gasket 55. The rear end of the second column 8 is formed as a second tapered portion 67, which can be embedded in the second sealing gasket 55 to improve the sealing effect. A third channel 68 is formed in the center of the third mounting base 66, which connects the first compartment 64 and the second channel 9. The rear end of the third channel 68 is formed as a third tapered portion 69. The front end of the shaft core 51 is securely mounted with the third sealing gasket 56, which can close or open the third channel 68. The first compartment 64 and the second compartment 65 are connected by a bypass channel 70, which is provided on the valve body 1 and connects to the first compartment 64 through the third external connection hole 12.

[0036] The rear end of the second mounting cavity 5 is provided with a fourth mounting seat 71, which is used to securely mount the second washer 48 and the second magnetic conductor 47. The second magnetic conductor 47 is also provided with a tenth sealing ring 72, which forms a compression seal with the inner wall of the fourth mounting seat 71. The front end face of the second washer 48 is provided with a sixth mounting groove 73, and the front end of the second moving iron core 50 is formed with a third stepped groove 74. The sixth mounting groove 73 and the third stepped groove 74 are used to securely mount the second spring 49. The front end face of the second moving iron core 50 is provided with a fifth mounting seat 75, which is formed with an internal threaded hole. The rear end of the shaft core 51 is provided with an external thread, and the shaft core 51 is fixedly mounted on the fifth mounting seat 75 by a threaded connection. The front end of the shaft core 51 is provided with a seventh mounting groove 76, which is used to securely mount the third sealing gasket 56. A second stepped seat 77 is provided on the rear side of the front end of the shaft core 51. A third washer 53 is installed on the second stepped seat 77. A fourth gap 78 is formed between the rear end face of the third washer 53 and the front end face of the limiting member 52. The fourth gap 78 is smaller than the third gap 61. The fourth gap 78 should be sufficient to fully open the third channel 68 when the second moving iron core 50 retracts. A fifth gap 79 is formed between the front end face of the second washer 48 and the rear end face of the movable member 54. The fifth gap 79 is smaller than the third gap 61. The fifth gap 79 should be sufficient to fully open the second channel 9 when the second moving iron core 50 retracts. Preferably, the sum of the fourth gap 78 and the fifth gap 79 is smaller than the third gap 61 to ensure that the second channel 9 and the third channel 68 can be fully opened when the second moving iron core 50 retracts.

[0037] The outer diameter surface of the movable part 54 is provided with a ninth mounting groove 81 and a tenth mounting groove 82. The ninth mounting groove 81 is used to securely install the eighth sealing ring 62, and the tenth mounting groove 82 is used to securely install the ninth sealing ring 63. The outer diameter surface of the second magnetic conductor 47 is provided with an eleventh mounting groove 83, which is used to securely install the tenth sealing ring 72. The front end of the second coil post 46 is provided with a twelfth mounting groove 84 and a fourth stepped groove 85. The fourth stepped groove 85 is used to securely install the sixth sealing ring 59, and the twelfth mounting groove 84 is used to securely install the seventh sealing ring 60. The outer diameter surface of the second stationary iron core 44 is provided with a thirteenth mounting groove 86, which is used to securely install the fifth sealing ring 58. The rear end of the second valve body 42 is provided with a sixth mounting seat 87, which is used to securely install the second stationary iron core 44. The second valve core assembly 3 is fastened to the valve body 1 by a second fastener 88, which is preferably a bolt.

[0038] The second washer 48 is installed on the shaft core 51 to prevent the shaft core 51 from directly impacting the limiting member 52 when the second moving iron core 50 moves backward, ensuring the long service life of the shaft core 51. The third washer 53 is installed on the second magnetic conductor 47 to prevent the moving part 54 from directly impacting the second magnetic conductor 47 under the backward pull of the second moving iron core 50, ensuring the long service life of the moving part 54. Both the second washer 48 and the third washer 53 are made of impact-resistant materials, improving the overall service life and product quality of the second valve core assembly 3. The second sealing gasket 55 is fixedly fitted on the front end of the moving part 54, and the third sealing gasket 56 is installed on the front end of the shaft core 51. Both are made of rubber or silicone materials. The second sealing gasket 55 is used to close the second channel 9 when the second valve core assembly 3 is in the closed state, thereby isolating the first compartment 64 and the second channel 9. The third sealing gasket 56 is used to close the third channel 68 when the second valve core assembly 3 is in the closed state, thereby isolating the second compartment 65 and the third channel 68.

[0039] After the second valve core assembly 3 is energized, when the second control board 43 is energized in a timely manner according to the external signal command, the second coil 45 is energized to form a magnetic field, the second magnetic conductor 47 strengthens the magnetic field, and the second stationary iron core 44 and the second moving iron core 50 form opposite magnetic poles on both sides of the third gap 61 to generate magnetic attraction. The second stationary iron core 44 remains stationary, and the second moving iron core 50 is magnetically attracted to move backward and compress the second spring 49. The second moving iron core 50 pulls the shaft core 51 backward to open the third channel 68. The fluid reaches the fourth external port 13 through the third external port 12, the bypass channel 70, the second partition chamber 65, the third channel 68 and the second channel 9 for small-flow pressure relief. The second moving iron core 50 continues to retract, causing the third washer 53 to reach the limiting member 52. The second moving iron core 50 continues to retract, pulling the limiting member 52 and the movable member 54 backward, thereby opening the second channel 9, which serves as the main flow channel. Fluid flows through the third external connection hole 12, the first partition chamber 64, and the second channel 9 to the fourth external connection hole 13, achieving a large flow rate of air supply. Simultaneously, it merges with the fluid in the third channel 68, forming a dual-channel convergence. The second moving iron core 50 continues to retract until the movable member 54 reaches the second washer 48, at which point the second moving iron core 50 stops moving and remains stationary.

[0040] When the second control board 43 cuts off power in a timely manner according to the external signal command, the magnetic field on the second coil 45 disappears, the second spring 49 resets, and the force of the second spring 49 drives the second moving iron core 50 to reset, which in turn pushes the shaft core 51 so that the third sealing pad 56 first closes the third channel 68. The force of the second spring 49 continues to push the second iron core, and then the shaft core 51 pushes the moving part 54 forward through the third sealing pad 56, finally causing the second sealing pad 55 to close the second channel 9.

[0041] The second valve core assembly 3 of the present invention has two-step switching actions: when opening, the third channel 68 is opened first, and then the second channel 9 is opened; when closing, the third channel 68 is closed first, and then the second channel 9 is closed.

[0042] To more intuitively illustrate the solenoid valve of the present invention, the solenoid valve of this embodiment is applied to the adsorption plate in the lithium battery stacking process. The solenoid valve functions as vacuum adsorption, holding, and positive pressure vacuum breaking. Specifically, the first external port 10 and the second external port 11 are control interfaces for vacuum pumping, and the third external port 12 and the fourth external port 13 are control interfaces for vacuum breaking. Specifically, in this application, the first external port 10 is connected to a vacuum source, the second external port 11 is connected to a vacuum suction cup, forming a vacuum adsorption / holding circuit; the third external port 12 is connected to a positive pressure gas source, and the fourth external port 13 is connected to the vacuum breaking circuit of the suction cup, forming a positive pressure release circuit. During operation, the first valve core assembly 2 is first energized to open the vacuum adsorption channel, enabling electrode pickup. Subsequently, both valve core assemblies are de-energized, and the valves are in a neutral closed state, relying on vacuum adsorption to hold the electrode, which also enhances the sealing of the first sealing gasket 22. Finally, the second valve core assembly 3 is energized, and positive pressure gas enters the vacuum breaking circuit in two steps through the third external connection hole 12, bypass channel 70, second mounting cavity 5, second channel 9, third channel 68, and fourth external connection hole 13, quickly and smoothly breaking the vacuum and releasing the electrode. This solenoid valve, through its cavity isolation, direct-pull shut-off valve, grease-free design, and two-step action, perfectly solves the problems of jamming, slow response, and short lifespan of existing slide valve pilot-operated solenoid valves in high-dust, high-requirement scenarios such as lithium battery stacking. The cavity isolation structure of this solenoid valve effectively prevents carbon powder from migrating from the vacuum side to the positive pressure side, and its grease-free and impact-resistant design perfectly adapts to the high-frequency, high-dust conditions of this process.

[0043] In this invention, the positive pressure end of the solenoid valve is adapted by the second valve core assembly 3 to the bypass channel 70 and the third channel 68. During the opening of the second air passage, the solenoid valve first opens the third channel 68 with a small flow rate using a small pulling force to release pressure. At this time, the positive air pressure is depressurized through the bypass channel 70, the second compartment 65, and the third channel 68, reducing the pressure difference between the two ends of the air passage. After the pressure is reduced, the main flow channel—the second channel 9—is opened, which can effectively reduce the working power of the valve assembly, make the opening action smoother, and improve the working efficiency and life of the valve assembly. During the closing of the second air passage, the elasticity of the second spring 49 causes the third sealing pad 56 to close the third channel 68 first. The positive pressure introduced by the bypass channel 70 into the second compartment 65 can play a certain auxiliary role in quickly closing the second channel 9. After the second air passage is closed, under the positive pressure of the external air source, the sealing pressure of the second sealing pad 55 and the third sealing pad 56 is increased, improving the sealing effect.

[0044] In this invention, the negative pressure end of the solenoid valve is directly sealed by the first sealing pad 22 to the first channel 7. During the negative pressure maintenance process, the vacuum adsorption force can further improve the sealing effect of the first sealing pad 22, and the vacuum adsorption force keeps the stacked plates more stable.

[0045] The solenoid valve implementing the present invention has the following significant advantages: 1. Strong dust resistance and long service life: This invention eliminates the need for precise sliding fit between the valve stem and valve cavity and grease lubrication structure required by traditional slide valves. Both the first valve core assembly (2) and the second valve core assembly (3) adopt a direct-pull stop valve structure driven directly by electromagnetic force. The core sealing method is the end face sealing between the sealing gasket (22, 55, 56) and the corresponding column (6, 8). This structure fundamentally eliminates the precision axial sliding pair that is prone to dust intrusion and jamming, and the whole is grease-free, so it is particularly suitable for high dust conditions such as lithium battery stacking, which significantly improves the reliability and service life of the valve.

[0046] 2. Fast and stable response, independent of system air pressure: Since both the first and second valve core assemblies (2, 3) are directly driven by electromagnetic force (direct pull type), the opening action of their moving iron core (21, 50) is directly driven by the magnetic attraction force generated by the energization of the coil (17, 45), without relying on pilot air pressure. Therefore, even when the system air pressure is low or unstable, the valve can still operate quickly and reliably, with a constant response time, and its performance is not affected by air pressure fluctuations.

[0047] 3. Physical isolation of cavities to prevent cross-contamination of media: The first mounting cavity (4) and the second mounting cavity (5) inside the valve body (1) are physically separated by a solid structural wall, with no direct fluid channel connection. This design completely isolates the first gas path controlling vacuum adsorption and the second gas path controlling positive pressure vacuum breaking inside the valve, effectively preventing dust (such as carbon powder) adsorbed on the vacuum side from migrating to the positive pressure side chamber, avoiding valve failure caused by cross-contamination, and improving the overall cleanliness and operational stability of the system.

[0048] 4. Two-step buffer design, smooth operation, low power consumption, and long service life: Specifically, the second valve core assembly (3) integrates the shaft core (51), limit member (52), moving member (54), third channel (68), and bypass channel (70), forming a buffer mechanism for pilot pressure relief followed by main channel opening. When opening, the second moving iron core (50) first pulls the shaft core (51) to open the third channel (68), allowing high-pressure gas to be depressurized at a small flow rate through the bypass channel (70), reducing the pressure difference at both ends of the main channel, and then pulls the moving member (54) to open the second channel (9). This two-step action can significantly reduce the impact force and required electromagnetic power at the moment of opening, making the valve opening and closing action smoother and gentler, further improving the efficiency of the actuator and the overall mechanical life.

[0049] 5. Superior sealing performance and adaptive enhancement under operating conditions: During the vacuum holding stage, the vacuum negative pressure in the first mounting cavity (4) acts on the first sealing pad (22), causing it to press more tightly against the conical part (80) of the first column (6), forming a self-reinforcing seal. During the positive pressure closing stage, the two-step closing mechanism of the second valve core assembly (3) ensures that the third channel (68) closes first. At this time, the positive pressure introduced by the bypass channel (70) can assist in pushing the moving part (54) to quickly close the second channel (9), and after closing, the system positive pressure continues to act on the back of the second and third sealing pads (55, 56), forming a continuous self-reinforcing sealing force. Therefore, the valve can achieve reliable and adaptive sealing under both vacuum and positive pressure conditions.

[0050] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. An electromagnetic valve characterized by comprising: The application relates to a solenoid valve, which comprises the following parts: a valve body (1) internally provided with a first installation cavity (4) and a second installation cavity (5) which are physically isolated from each other; a first valve core assembly (2) in a direct-drive straight-lift type stop valve structure, fastened and installed on one side of the valve body (1) and extending into the first installation cavity (4) and used for controlling the opening and closing of a first gas path connected with the first installation cavity (4); and a second valve core assembly (3) in a direct-drive straight-lift type stop valve structure, fastened and installed on the other side of the valve body (1) and extending into the second installation cavity (5) and used for controlling the opening and closing of a second gas path connected with the second installation cavity (5); wherein the first valve core assembly (2) and the second valve core assembly (3) each comprise a moving iron core and a closing pad arranged at the front end of the moving iron core, and the valve body (1) is internally provided with a columnar abutment which is matched with the closing pad to form an end face seal.

2. The electromagnetic valve according to claim 1, characterized by The internal structure of the solenoid valve is designed without grease lubrication; wherein, the first installation cavity (4) is internally provided with a first columnar abutment (6), the first columnar abutment (6) is internally provided with a first channel (7), the front end of the first valve core assembly (2) is provided with a first closing pad (22), and the first closing pad (22) is configured to abut or be away from the first columnar abutment (6) so as to close or open the first channel (7); the second installation cavity (5) is internally provided with a second columnar abutment (8), the second columnar abutment (8) is internally provided with a second channel (9), the second valve core assembly (3) comprises a movable part (54) and a second closing pad (55) arranged at the front end of the movable part (54), and the second closing pad (55) is configured to abut or be away from the second columnar abutment (8) so as to close or open the second channel (9).

3. The electromagnetic valve according to claim 2, characterized by The second valve core assembly (3) further comprises a shaft core (51) and a third closing pad (56) arranged at the front end of the shaft core (51); the movable part (54) is slidably arranged in the second installation cavity (5) and divides the second installation cavity (5) into a first separated cavity (64) and a second separated cavity (65) through a sealing part, the movable part (54) is internally provided with a third channel (68) which connects the first separated cavity (64) with the second channel (9); the third closing pad (56) is configured to close or open the third channel (68); the valve body (1) is internally provided with a bypass channel (70) which connects the second separated cavity (65) with a third external connecting hole (12) used for connecting with a fluid medium.

4. The electromagnetic valve according to claim 3, characterized by The second valve core assembly (3) further comprises a limiting part (52), and the second valve core assembly (3) is configured to: when energized and opened, the second moving iron core (50) retreats, sequentially drives the shaft core (51) to make the third closing pad (56) open the third channel (68), and then drives the movable part (54) through the limiting part (52) to make the second closing pad (55) open the second channel (9). In the power-off closing, the second moving iron core (50) resets, and in turn, the third passage (68) is closed by the third closing pad (56) and the second passage (9) is closed by the second closing pad (55).

5. The electromagnetic valve according to claim 1, characterized by The first valve core assembly (2) comprises a first static iron core (16), a first moving iron core (21), a first coil (17) and a first spring (20); The second valve core assembly (3) comprises a second static iron core (44), a second moving iron core (50), a second coil (45) and a second spring (49); When the first coil (17) and the second coil (45) are powered, magnetic attraction is generated between the corresponding static iron core and moving iron core, directly driving the moving iron core to move against the elastic force of the corresponding spring.

6. The electromagnetic valve according to claim 2 or 3, characterized by The end of the first column (6) and / or the second column (8) is formed into a tapered portion, and the first closing pad (22) and / or the second closing pad (55) is configured to be embedded into the corresponding tapered portion.

7. The electromagnetic valve according to claim 2, characterized by The valve body (1) is provided with: A first external hole (10) and a second external hole (11), the first external hole (10) communicates with the first passage (7), and the second external hole (11) communicates with the first installation cavity (4), constituting the first gas circuit; A third external hole (12) and a fourth external hole (13), the third external hole (12) communicates with the second installation cavity (5), and the fourth external hole (13) communicates with the second passage (9), constituting the second gas circuit.

8. The electromagnetic valve according to claim 7, characterized by The electromagnetic valve is configured for vacuum suction and positive pressure vacuum breaking control, wherein: The first external hole (10) and the second external hole (11) constitute a vacuum suction circuit interface; The third external hole (12) and the fourth external hole (13) constitute a positive pressure vacuum breaking circuit interface.

9. The electromagnetic valve according to claim 1, characterized by The first valve core assembly (2) and / or the second valve core assembly (3) further comprises a shock-resistant washer arranged between the moving iron core and the adjacent component.

10. The electromagnetic valve according to claim 1, characterized by The first valve core assembly (2) and the second valve core assembly (3) are respectively detachably mounted on both sides of the valve body (1) by fasteners.

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