Double-coil series control driving electromagnetic valve and working method thereof

Abstract

The application discloses a double-coil series control driving electromagnetic valve and a working method thereof. A double-coil series structure is arranged in the shell, a moving iron core is arranged directly below the double-coil series structure, and the moving iron core is slidingly fitted between the lower side space of the double-coil series structure and the internal space of the shell. A pin shaft and a hinged plate are arranged in the shell, the pin shaft is rotationally connected with the shell, the hinged plate is provided with a hole in the middle and is sleeved on the outer cylindrical surface of the pin shaft, the second end of the hinged plate is located directly below the moving iron core, the bottom end of the moving iron core and the first end of the hinged plate are respectively provided with elastic elements between the top surface of the shell, a diaphragm is arranged between the bottom of the shell and the top of a valve body, the central region of the diaphragm is arranged on the surface of the top of the valve body, and the two ends of the diaphragm are respectively located directly below the first end of the hinged plate and the second end of the hinged plate. Three channels are arranged in the valve body and are communicated with the outside and are located directly below the diaphragm. The structure is simple, easy to integrate and install, and quick response in the opening and closing process of the valve is ensured.

Description

Technical Field

[0001] This invention belongs to the field of solenoid valves and relates to a dual-coil series control solenoid valve and its working method. Background Technology

[0002] Typical solenoid valves employ a single-coil solenoid structure. To fully utilize internal space, these valves are typically square or nearly square to provide greater sealing force. This structure results in a larger width, making it less user-friendly for integrated applications and installation. Furthermore, the conventional dual-coil structure is more complex, with one coil serving as the starting coil and the other as the holding coil, enabling high-current operation and low-current holding. This structure generally incorporates a contact switch design, which is prone to oxidation and adhesion, leading to failure. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a dual-coil series control drive solenoid valve and its working method, which has a simple structure, is easy to integrate and install, and ensures rapid response during valve opening and closing.

[0004] To achieve the above objectives, the present invention employs the following technical solution: A dual-coil series-connected control and drive solenoid valve includes an outer shell, a housing, and a valve body connected sequentially from top to bottom. The outer shell has a double coil series structure inside, and a moving iron core is located directly below the double coil series structure. The moving iron core slides between the space below the double coil series structure and the space inside the shell. The housing contains a pin and a rocker plate. The pin is rotatably connected to the housing. The rocker plate has a hole in the middle and is fitted onto the outer cylindrical surface of the pin. The second end of the rocker plate is located directly below the moving iron core. Elastic elements are provided between the bottom end of the moving iron core and the first end of the rocker plate and the top surface inside the housing. A diaphragm is provided between the bottom of the housing and the top of the valve body. The central area of ​​the diaphragm is laid on the top surface of the valve body, and the two ends of the diaphragm are located directly below the first end and the second end of the rocker plate, respectively. The valve body has three channels that communicate with the outside: a common port channel, a normally closed port channel, and a normally open port channel. All three channels are open on the top surface of the valve body. The common port channel is located directly below the center of the diaphragm, the normally open port channel is located directly below the first end of the diaphragm, and the normally closed port channel is located directly below the second end of the diaphragm.

[0005] Optionally, the dual-coil series structure includes a first winding frame and a second winding frame arranged in parallel; the first winding frame has a first fixed iron core inside, and a first coil is wound on the outer surface of the first winding frame; the second winding frame has a second fixed iron core inside, and a second coil is wound on the outer surface of the second winding frame, with the ends of the first coil and the ends of the second coil connected in series.

[0006] Optionally, magnetic sheets are provided at the top and bottom of the dual-coil series structure, and the top of the first fixed iron core and the top of the second fixed iron core are respectively inserted upward into the magnetic sheets located at the top; a magnetic frame is provided outside the dual-coil series structure, the outer wall of the magnetic frame is attached to the inner wall of the outer shell, the top surface of the magnetic frame contacts the magnetic sheet located at the top, and the bottom surface of the magnetic frame contacts the magnetic sheets located at the top and bottom.

[0007] Optionally, the outer cylindrical surface of the moving iron core is recessed towards the center to form an annular groove; an anti-wear ring is provided inside the annular groove, and the outer ring of the anti-wear ring protrudes outside the annular groove.

[0008] Optionally, pin holes are respectively opened on the two side walls of the internal cavity of the housing; the first end of the pin is inserted into the corresponding side pin hole to form a clearance fit, and the second end of the pin is inserted into the corresponding side pin hole to form an interference fit.

[0009] Optionally, the top of the housing is provided with a cover, and the side wall of the cover is provided with lead terminals; the internal metal connector of the lead terminals is connected to the coil of the double coil series structure through a hook structure.

[0010] Optionally, a sealing ring is provided between the top of the housing and the bottom of the outer casing.

[0011] Optionally, a tower spring is used as the elastic element between the bottom end of the moving iron core and the top surface inside the housing, and a compression spring is used as the elastic element between the second end of the rocker plate and the top surface inside the housing.

[0012] A method for operating a dual-coil series-controlled solenoid valve includes a power-off operation process and a power-on operation process: The power-off operation process is as follows: external power supply to the dual-coil series structure stops, and the dual-coil series structure loses its upward electromagnetic attraction to the moving iron core; the moving iron core slides downward under the downward thrust of the elastic element between the bottom end of the moving iron core and the top surface of the housing, and the bottom end of the moving iron core presses down on the second end of the rocker plate; the rocker plate rotates around the pin under pressure, and the first end of the rocker plate overcomes the thrust of the elastic element between itself and the top surface of the housing and lifts upward; the second end of the rocker plate presses down on the second end of the diaphragm located directly below it, and the second end of the diaphragm deforms downward under pressure and adheres to the opening of the normally closed port channel, closing the normally closed port channel; the first end of the diaphragm located directly below the first end of the rocker plate disengages from the pressure and resets upward, and the opening of the normally open port channel is in an open state; fluid enters the valve body through the common port channel, flows inside the valve body, and flows out from the open normally open port channel; Power-on operation: External power is supplied to the dual-coil series structure, which generates an upward electromagnetic attraction. The moving iron core, pulled by the electromagnetic attraction, overcomes the thrust of the corresponding elastic element at its bottom end and slides upward, releasing the second end of the rocker. The first end of the rocker moves downward under the thrust of the elastic element between itself and the top surface inside the housing. The rocker rotates in the opposite direction around the pin shaft, and the second end of the rocker simultaneously lifts upward. The first end of the rocker presses down on the first end of the diaphragm located directly below it, causing the diaphragm to deform downward and adhere to the opening of the normally open port channel, closing the normally open port channel. The second end of the diaphragm located directly below the second end of the rocker releases the pressure and resets upward, leaving the normally closed port channel open. Fluid enters the valve body through the common port channel, flows inside the valve body, and flows out through the open normally closed port channel.

[0013] Optionally, during energized operation, the power supply current enters the internal structure of the dual-coil series connection, and flows sequentially through the first coil and the second coil connected in series. The first coil generates a magnetic field when energized, and the magnetic field passes through the first winding frame and magnetizes the first fixed iron core inside. The second coil generates a magnetic field when energized, and the magnetic field passes through the second winding frame and magnetizes the second fixed iron core inside. The magnetic force generated by the magnetic field of the first fixed iron core and the second fixed iron core together converges and forms a vertically upward electromagnetic attraction force directly below the dual-coil series connection structure. The electromagnetic attraction force acts perpendicularly on the moving iron core below.

[0014] Compared with the prior art, the present invention has the following beneficial effects: This invention utilizes a top-down, vertically integrated layout, resulting in a compact overall structure for the solenoid valve. This effectively reduces the horizontal volume occupied, facilitating installation and integration in confined spaces. Its internal dual-coil series structure, combined with a moving iron core, eliminates the easily damaged contact switch found in traditional solenoid valves. Furthermore, by employing the seesaw lever principle of a rocker plate, the linear up-and-down movement of the moving iron core and elastic element is transformed into alternating pressing motions at both ends of the rocker plate, thereby controlling the sealing of the normally open and normally closed channels by the diaphragm. This rocker-type sealing mechanism not only offers rapid reversing response but also significantly reduces the risk of mechanical jamming, substantially improving the stability of valve flow path switching and extending its overall service life.

[0015] Furthermore, two winding frames are arranged side by side, with the ends of the two coils connected in series. This design eliminates the complex circuitry required for switching between the traditional starting and holding coils via a contact switch, thus preventing valve failure due to oxidation or adhesion of the switch contacts. At the same time, the parallel dual-frame structure makes full use of the internal geometric space of the housing, allowing the solenoid valve to generate a sufficiently large electromagnetic driving force even under low-power conditions in series.

[0016] Furthermore, by adding magnetic sheets to the top and bottom of the dual-coil series structure, and an external magnetic guide frame connected to the internal fixed iron core, a complete and closed low magnetic reluctance circuit is constructed inside the solenoid valve. This circuit can effectively concentrate and guide the magnetic lines of force generated when the coil is energized, significantly reducing magnetic leakage. This maximizes the electromagnetic attraction to the moving iron core below under the same current, effectively improving the solenoid valve's operating efficiency and response sensitivity.

[0017] Furthermore, an annular groove is designed on the outer cylindrical surface of the moving iron core, and an anti-wear ring is embedded therein. Utilizing the characteristic of the anti-wear ring protruding from the outer cylindrical surface, the large-area metal friction between the moving iron core and the surrounding cavity wall is transformed into localized low-friction sliding between the anti-wear ring and the wall. This serves as a guide for the up-and-down sliding motion and provides self-lubrication, effectively preventing uneven wear or jamming of the moving iron core during high-speed reciprocating motion, and ensuring extremely high reliability for the long-term high-frequency operation of the solenoid valve.

[0018] Furthermore, one end of the pin adopts a clearance fit, while the other end adopts an interference fit. This asymmetrical installation method not only reduces the assembly difficulty and facilitates rapid insertion and positioning on the assembly line, but also relies on the strong frictional resistance of the interference fit end to ensure that the pin will not move axially or fall off under the conditions of long-term vibration of the solenoid valve and frequent reciprocating swing of the rocker, greatly enhancing the structural robustness of the mechanical transmission components.

[0019] Furthermore, an independent cover and lead terminal design are adopted, and an internal hook structure is used to achieve electrical connection. This modular lead terminal design allows the external power cord and the solenoid valve body to be manufactured and assembled separately, reducing the operational difficulty caused by dragging long wire harnesses during assembly. This not only improves the efficiency of production and assembly, but also facilitates users to quickly customize, replace, or add protective sleeves for external leads according to different application scenarios.

[0020] Furthermore, a sealing ring is added between the outer shell and the housing. The clamping force during assembly causes the sealing ring to elastically deform and fill the internal gaps. This sealing structure isolates the fluid channel through which the lower medium flows from the electrical component cavity housing the coil in the upper part, completely blocking the upward leakage path of the fluid medium. This effectively prevents short-circuit faults caused by water ingress, moisture, or corrosion of the electromagnetic coil, ensuring the absolute safety of the electrical system. Attached Figure Description

[0021] Figure 1 This is a perspective view of the dual-coil series control drive solenoid valve of the present invention; Figure 2 This is a front view of the dual-coil series control drive solenoid valve of the present invention; Figure 3 This is a top view of the dual-coil series control drive solenoid valve of the present invention; Figure 4 For the purposes of this invention Figure 3 A cross-sectional view along the transverse centerline; Figure 5 This is a bottom view of the dual-coil series control drive solenoid valve of the present invention; Figure 6 This is a left view of the dual-coil series control drive solenoid valve of the present invention; Figure 7 This is a right view of the dual-coil series control drive solenoid valve of the present invention.

[0022] The components are: 1-lead terminal, 2-magnetic guide frame, 3-box cover, 4-first coil, 5-first winding frame, 6-first fixed iron core, 7-magnetic guide sheet, 8-second fixed iron core, 9-second winding frame, 10-second coil, 11-outer shell, 12-moving iron core, 13-anti-wear ring, 14-sealing ring, 15-tower spring, 16-shell, 17-valve body, 18-pin, 19-rocker, 20-diaphragm, 21-compression spring assembly, 22-screw. Detailed Implementation

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terms “installation,” “connection,” and “linkage” should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; a mechanical connection, an electrical connection, or a connection that allows communication; a direct connection or an indirect connection via an intermediate medium; or a connection within two elements or an interaction between two elements. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0026] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0027] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0028] like Figures 1-7As shown, this is the dual-coil series control solenoid valve of the present invention. The top of the solenoid valve is a cover 3, which seals the space above the solenoid valve. Below the cover 3 is a housing 11. The housing 11 is a hollow tubular shape. The upper edge of the housing 11 connects to the lower edge of the cover 3. The housing 11 surrounds the upper part of the electromagnetic drive component inside the solenoid valve. Below the housing 11 is a shell 16. The shell 16 is also an outer support component. The upper edge of the shell 16 connects to the lower edge of the housing 11. The interior of the shell 16 has a cavity to accommodate the intermediate mechanical transmission component.

[0029] Below the housing 16, a valve body 17 is located. The valve body 17 is situated at the bottom of the solenoid valve. The valve body 17 is a base of a certain thickness. The upper surface of the valve body 17 is connected to the lower surface of the housing 16. The interior of the valve body 17 contains conduits for the passage of fluid or gas. Screws 22 are installed at the bottom of the solenoid valve to secure these external components together. Figure 5 As shown, two screws 22 are mounted on the bottom surface of the valve body 17. The screws 22 pass through the solid portion of the valve body 17. The screws 22 extend upwards. The screws 22 are screwed into the upper housing 16.

[0030] In the solenoid valve, fluid flows within the valve body 17 at the bottom, while the electrical components that generate magnetic force are installed in the upper housing 11. A sealing component separating the fluid and electrical components is installed in the middle housing 16.

[0031] A lead terminal 1 is installed on the side of the cover 3. The lead terminal 1 is used to connect an external power cord. The lead terminal 1 has an outwardly protruding metal connector. The external lead can be connected to this metal connector. The lead terminal 1 and the internal electromagnetic structure are connected by a hook-and-loop connection. This hook-and-loop connection method allows the external lead to be separated from the solenoid valve body. The external lead can be installed and used independently. This design reduces the difficulty of assembly operation. It eliminates the need to rotate or move long wires along with the entire valve body, thereby improving assembly efficiency. At the same time, the external lead can be customized according to different usage requirements. The external lead can also be protected with protective sleeves or other protective measures as needed. Current flows from the external conductor through the lead terminal 1 and then into the coil inside the housing 11.

[0032] Inside the housing 11, coils and a bobbin assembly are installed. On one side of the housing 11, a first winding bobbin 5 is placed. The first winding bobbin 5 is a support made of insulating material. A cylindrical hole runs vertically through the center of the first winding bobbin 5. A first coil 4 is wound around the first winding bobbin 5. The first coil 4 is tightly attached to the outer surface of the first winding bobbin 5. On the other side of the housing 11, a second winding bobbin 9 is placed. A second coil 10 is wound around the second winding bobbin 9. In the circuit connection, the first coil 4 and the second coil 10 are connected in series. After the current enters from the lead terminal 1, it first flows through the first coil 4, and then through the second coil 10. This dual-coil series electromagnetic drive design eliminates the easily damaged contact switch. This design simplifies the coil structure, thus reducing the likelihood of solenoid valve failures and ensuring more stable operation of the solenoid valve.

[0033] Magnetic guide sheets 7 are respectively disposed above and below the coil and the frame. The magnetic guide sheets 7 are placed horizontally inside the upper and lower ends of the solenoid valve. The magnetic guide sheet 7 is made of many thin silicon steel sheets stacked together. These thin silicon steel sheets are layered and then riveted and pressed together to form a magnetic guide sheet 7 of a certain thickness. Silicon steel is a soft magnetic material. Stacking multiple silicon steel sheets together as the magnetic guide sheet 7 is designed to increase the permeability. Increased permeability generates a larger magnetic force. The upper magnetic guide sheet 7 has limit holes at both the first winding frame 5 and the second winding frame 9.

[0034] When current flows through the first coil 4 and the second coil 10, a magnetic field is generated. To concentrate the force of this magnetic field on the moving component, a magnetically conductive metal is needed to form a path. Both the first winding frame 5 and the second winding frame 9 are hollow structures. A first fixed iron core 6 is placed inside the first winding frame 5. The first fixed iron core 6 is a cylindrical iron core part, and its top is inserted into one of the limiting holes of the magnetically conductive sheet 7. The outer cylindrical surface of the first fixed iron core 6 is adjacent to the inner cylindrical surface of the first winding frame 5. A second fixed iron core 8 is placed inside the second winding frame 9. The second fixed iron core 8 is also a cylindrical iron core part, positioned stationary in the middle of the hole in the lower frame, and its top is inserted into the other limiting hole of the magnetically conductive sheet 7. The outer cylindrical surface of the second fixed iron core 8 is adjacent to the inner cylindrical surface of the second winding frame 9. The first fixed iron core 6 guides the magnetic lines of force generated by the first coil 4. The second fixed iron core 8 guides the magnetic lines of force generated by the second coil 10.

[0035] A magnetic guide frame 2 is also installed outside the coil and the frame. The outer wall of the magnetic guide frame 2 is in contact with the inner wall of the outer casing 11, and the upper end of the magnetic guide frame 2 contacts the upper magnetic guide sheet 7. The magnetic guide frame 2 extends downward along the inner wall of the outer casing 11. The lower end of the magnetic guide frame 2 extends to the lower magnetic guide sheet 7.

[0036] The first fixed iron core 6, the magnetic conductive sheet 7, the magnetic conductive frame 2, and the second fixed iron core 8 together form a closed loop that encloses the magnetic field lines. Within this loop, the magnetic field lines can flow smoothly.

[0037] Below the second fixed iron core 8, a moving iron core 12 is provided. The moving iron core 12 is a metal cylinder that can move up and down. The top of the moving iron core 12 faces the bottom of the second fixed iron core 8. When the solenoid valve is not energized, the top of the moving iron core 12 and the bottom of the second fixed iron core 8 do not contact each other. There is a gap between them. This gap is the air gap. When the upper coil is energized and generates magnetic force, the magnetic lines of force pull the iron core 12 upward. Under the action of this upward magnetic force, the moving iron core 12 moves upward until the top of the moving iron core 12 touches the bottom of the second fixed iron core 8. The moving iron core 12 needs to slide up and down repeatedly in the channel inside the outer casing 11. On the outer cylindrical surface of the moving iron core 12, an annular groove is carved inward. The annular groove surrounds the moving iron core 12. An anti-wear ring 13 is installed in the annular groove. The inner ring of the anti-wear ring 13 is attached to the bottom surface of the annular groove, and the outer ring of the anti-wear ring 13 protrudes outside the annular groove. When the moving iron core 12 moves up and down, the anti-wear ring 13 slides up and down along with it. The anti-wear ring 13 provides a vertical guide for the moving iron core 12 to slide up and down. This ensures that the moving iron core 12 can move straight up and down. The moving iron core 12 has an annular groove and is designed to be assembled with the anti-wear ring 13 for guidance, preventing parts from getting stuck and rubbing against each other, and ensuring the reliability of the solenoid valve's operation.

[0038] Below the moving iron core 12, between the surfaces where the housing 16 and the outer shell 11 connect, a sealing ring 14 is installed. The sealing ring 14 is an elastic rubber ring. The sealing ring 14 is placed in the gap between the two structures. During assembly, the screw 22 tightens the outer structure, flattening the sealing ring 14. The flattened sealing ring 14 fills all the gaps. Fluid or gas inside the lower valve body 17, when flowing upwards, is blocked by the sealing ring 14 and cannot enter the area where the lead terminal 1, the first coil 4, and the second coil 10 are installed. Inside the housing 16, a tower spring 15 is installed on the outer cylindrical surface near the bottom of the moving iron core 12. In the assembled state, the top of the tower spring 15 contacts the top of the inner shell 16, and the bottom of the tower spring 15 connects to the moving iron core 12. The tower spring 15 is compressed, causing it to continuously exert a downward pushing force on the moving iron core 12.

[0039] Pin holes are provided on the left and right side walls of the cavity of housing 16. Pin 18 spans the internal space of housing 16. The left end of pin 18 is inserted into the left pin hole, and the right end is inserted into the right pin hole. Pin 18 is placed horizontally, serving as the moving central axis. One end of pin 18 has an outer diameter slightly smaller than the inner diameter of the corresponding pin hole. After this end of pin 18 is inserted into the hole, there is a small gap in the middle, forming a clearance fit. The other end of pin 18 has an outer diameter slightly larger than the inner diameter of the corresponding pin hole. This end of pin 18 is forced into the hole, forming an interference fit. The design of a clearance fit at one end and an interference fit at the other end ensures that pin 18 is firmly held in place during long-term vibration. This prevents pin 18 from falling out and improves the reliability of the solenoid valve.

[0040] A rocker arm 19, a metal strip, is fitted around the outside of the pin 18. A through-hole is cut into the center of the rocker arm 19. The pin 18 passes through this hole. The left and right ends of the rocker arm 19 swing up and down around the central pin 18 like a seesaw. The left end of the rocker arm 19 extends below the moving iron core 12, and the downward force of the tower spring 15 acts on the left end of the rocker arm 19. A compression spring 21 is installed on the right end of the rocker arm 19. The top of the compression spring 21 contacts the top of the inner shell 16, and the bottom end of the compression spring 21 connects to the right end of the rocker arm 19. The function of the compression spring 21 is to apply downward pressure to the right end of the rocker arm 19. The tower spring 15, the compression spring 21, and the rocker arm 19 work together to form a linked transmission structure. The force from above is transmitted to the rocker arm 19 through the tower spring 15 and the compression spring 21. The rocker arm 19 transforms this up-and-down thrust into a rotational motion of its left and right ends.

[0041] Diaphragms 20 are positioned below the left and right ends of the rocker arm 19. The diaphragms 20 lie flat on top of the lowermost valve body 17, with their edges sandwiched between the bottom surface of the housing 16 and the top surface of the valve body 17, thus forming a sealed cavity between the diaphragms 20 and the valve body 17. The valve body 17, acting as a base, has three internal channels communicating with the outside. These three channels open on the top surface of the valve body 17, located below the diaphragms 20. These three channels are respectively the channel for the common port COM, the normally closed port NC, and the normally open port NO.

[0042] The COM port channel is in the middle. The normally closed NC port channel is on the left. The normally open NO port channel is on the right. When diaphragm 20 is pressed down, its lower surface presses tightly against the opening on the top surface of the channel, covering it. The upper surface of diaphragm 20 faces the left and right ends of the upper rocker 19. The left end of rocker 19 faces the left side of diaphragm 20, directly below which is the opening of the left NC port channel. The right end of rocker 19 faces the right side of diaphragm 20, directly below which is the opening of the right NO port channel. When rocker 19 rotates downwards on the left, its left end presses against the top of the left side of diaphragm 20, causing diaphragm 20 to concave downwards and press against the opening of the NC port channel. When rocker 19 rotates downwards on the right, its right end presses against the top of the right side of diaphragm 20, causing diaphragm 20 to concave downwards and press against the opening of the NO port channel. The rocker-type sealing mechanism is formed by the alternating pressure of diaphragm 20 from both ends of rocker 19. When one side is pressed down to block the hole, the other side will inevitably rise. The hole will then be open on the raised side.

[0043] When the solenoid valve is not connected to an external power source, terminal 1 receives no current. There is no electricity in the first coil 4 and the second coil 10, and no magnetic force is generated around them. There is no upward attraction between the second fixed iron core 8 and the moving iron core 12. At this time, the tower spring 15 acts as a spring. The tower spring 15 continuously provides a downward thrust. This thrust acts on the rocker arm 19. The tower spring 15 pushes the rocker arm 19 to rotate around the pin 18, causing the left end of the rocker arm 19 to tilt downwards. The downward movement of the left end of the rocker arm 19 directly drives the diaphragm 20 located on the left side to move downwards. The left part of the diaphragm 20 moves downwards, blocking the NC port channel on the left side of the valve body 17. The normally closed port channel on the left side is blocked. At this time, fluid flows into the cavity from the common port COM in the middle of the valve body 17. Because the NC port channel on the left is blocked, the fluid can only flow to the right. The fluid flows out from the NO port channel on the right side of the valve body 17. Therefore, when the power is off, the connection between the common port COM and the right NO port is achieved. Fluid enters from the COM port of valve body 17 and exits from the NO port.

[0044] When the external lead 1 is energized, current enters the solenoid valve. The current flows sequentially through the first coil 4 and the second coil 10 connected in series inside the outer casing 11. The energized coils generate a magnetic field, which magnetizes the first fixed iron core 6, the second fixed iron core 8, and the moving iron core 12. Magnetic lines of force flow within the magnetic guide frame 2 and the magnetic guide plate 7, forming a complete magnetic circuit. The magnetic circuit generates a strong upward magnetic force at the gap between the second fixed iron core 8 and the moving iron core 12. The magnetic force pulls the moving iron core 12 upward. The moving iron core 12 is attracted to the second fixed iron core 8. The moving iron core 12 moves away from the left end of the rocker arm 19, and the compression spring 21 pushes the rocker arm 19 downward. The rocker arm 19 rotates around the pin 18 in the other direction, causing the diaphragm 20 on the right side to move downward. The right side of the diaphragm 20 moves downward, blocking the NO port channel on the right side of the valve body 17. At this point, because the right-side NO channel is blocked, the left-side diaphragm 20 is lifted due to the release of force, and fluid flows into the cavity from the common port COM in the middle of the valve body 17. The fluid flows out from the unobstructed NC port channel on the left side of the valve body 17. This achieves connectivity between the common port COM and the left-side NC port. Fluid flows from the COM port to the NC port of the valve body 17.

[0045] By energizing or de-energizing lead terminal 1, the solenoid valve can continuously cycle and thus repeatedly switch the medium on and off.

[0046] The invention has a simple structure, is easy to integrate and install, and the external leads can be installed and used separately, reducing assembly difficulty and improving assembly efficiency.

[0047] The sealing structure of this invention adopts a rocker-type sealing mechanism to ensure rapid response during valve opening and closing.

[0048] The electromagnetic structure of this invention adopts a dual-coil series solenoid control and drive structure design. At the same time, multiple soft magnetic materials with high permeability are stacked to form a magnetic sheet 7, which increases the permeability, reduces the power consumption of the product, and generates a larger electromagnetic force.

[0049] This invention features a volumetric structure that minimizes thickness, facilitating integration and installation while saving installation space.

[0050] The moving iron core 12 of this invention adopts a grooved anti-wear ring design to ensure reliable operation of the product.

[0051] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0052] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0053] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual coupling, direct coupling, or communication connection may be through some interfaces; the indirect coupling or communication connection between units or modules may be electrical or other forms.

[0054] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0055] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

[0056] It should be understood that the above description is for illustrative purposes and not for limitation. Many embodiments and applications beyond the provided examples will be apparent to those skilled in the art upon reading the above description. Therefore, the scope of this patent should not be determined by reference to the above description, but rather by reference to the foregoing claims and the full scope of their equivalents. For purposes of completeness, all articles and references, including patent applications and publications, are incorporated herein by reference. The omission of any aspect of the subject matter disclosed herein in the foregoing claims is not intended as a waiver of that subject matter, nor should it be construed as an indication that the applicant has not considered that subject matter as part of the disclosed inventive subject matter.

Claims

1. A dual-coil series-controlled solenoid valve, characterized in that, It includes an outer shell (11), a housing (16), and a valve body (17) connected from top to bottom. The shell (11) is provided with a double coil series structure inside, and a moving iron core (12) is provided directly below the double coil series structure. The moving iron core (12) slides between the space below the double coil series structure and the space inside the shell (16). The housing (16) is provided with a pin (18) and a rocker plate (19). The pin (18) is rotatably connected to the housing (16). The rocker plate (19) has a hole in the middle and is sleeved on the outer cylindrical surface of the pin (18). The second end of the rocker plate (19) is located directly below the moving iron core (12). The bottom end of the moving iron core (12) and the first end of the rocker plate (19) are respectively provided with elastic elements between them and the top surface of the housing (16). A diaphragm (20) is provided between the bottom of the housing (16) and the top of the valve body (17). The central area of ​​the diaphragm (20) is laid on the top surface of the valve body (17), and the two ends of the diaphragm (20) are respectively located directly below the first end of the rocker plate (19) and directly below the second end of the rocker plate (19). The valve body (17) is provided with three channels that communicate with the outside, namely a common port channel, a normally closed port channel and a normally open port channel. All three channels are open on the top surface of the valve body (17). The opening of the common port channel is located directly below the center of the diaphragm (20), the opening of the normally open port channel is located directly below the first end of the diaphragm (20), and the opening of the normally closed port channel is located directly below the second end of the diaphragm (20).

2. The dual-coil series control and drive solenoid valve according to claim 1, characterized in that, The double-coil series structure includes a first winding frame (5) and a second winding frame (9) arranged in parallel; the first winding frame (5) has a first fixed iron core (6) inside, and a first coil (4) is wound on the outer surface of the first winding frame (5); the second winding frame (9) has a second fixed iron core (8) inside, and a second coil (10) is wound on the outer surface of the second winding frame (9); the end of the first coil (4) and the end of the second coil (10) are connected in series.

3. The dual-coil series-controlled solenoid valve according to claim 2, characterized in that, The top and bottom of the double coil series structure are respectively provided with magnetic plates (7). The top of the first fixed iron core (6) and the top of the second fixed iron core (8) are respectively inserted upward into the magnetic plates (7) located at the top. The double coil series structure is provided with a magnetic frame (2). The outer wall of the magnetic frame (2) is attached to the inner wall of the outer shell (11). The top surface of the magnetic frame (2) contacts the magnetic plate (7) located at the top, and the bottom surface of the magnetic frame (2) contacts the magnetic plate (7) located at the top and bottom.

4. The dual-coil series-controlled solenoid valve according to claim 1, characterized in that, The outer cylindrical surface of the moving iron core (12) is recessed towards the center to form an annular groove; an anti-wear ring (13) is provided inside the annular groove, and the outer ring of the anti-wear ring (13) protrudes outside the annular groove.

5. The dual-coil series-controlled solenoid valve according to claim 1, characterized in that, Pin holes are provided on both sides of the cavity inside the housing (16); the first end of the pin (18) is inserted into the corresponding side pin hole to form a clearance fit, and the second end of the pin (18) is inserted into the corresponding side pin hole to form an interference fit.

6. The dual-coil series-controlled solenoid valve according to claim 1, characterized in that, The top of the outer casing (11) is provided with a cover (3), and the side wall of the cover (3) is provided with lead terminals (1); the internal metal connector of the lead terminals (1) is connected to the coil of the double coil series structure through a hook structure.

7. The dual-coil series-controlled solenoid valve according to claim 1, characterized in that, A sealing ring (14) is provided between the top of the housing (16) and the bottom of the outer shell (11).

8. The dual-coil series-controlled solenoid valve according to claim 1, characterized in that, The elastic element between the bottom end of the moving iron core (12) and the top surface inside the shell (16) is a tower spring (15), and the elastic element between the second end of the rocker (19) and the top surface inside the shell (16) is a compression spring (21).

9. A method for operating a dual-coil series-controlled solenoid valve according to any one of claims 1-8, characterized in that, Includes both power-off operation and power-on operation processes: The power-off operation process is as follows: external power supply to the double coil series structure stops, and the double coil series structure loses its upward electromagnetic attraction to the moving iron core (12); the moving iron core (12) slides downward under the downward thrust of the elastic element between the bottom end of the moving iron core (12) and the top surface of the inner shell (16), and the bottom end of the moving iron core (12) presses down on the second end of the rocker plate (19); the rocker plate (19) rotates around the pin shaft (18) under pressure, and the first end of the rocker plate (19) lifts up against the thrust of the elastic element between it and the top surface of the inner shell (16); the second end of the rocker plate (19) presses down on the second end of the diaphragm (20) located directly below it, and the second end of the diaphragm (20) deforms downward under pressure and adheres to the opening of the normally closed port channel, and the normally closed port channel is closed; the first end of the diaphragm (20) located directly below the first end of the rocker plate (19) is released from the pressure and resets upward, and the opening of the normally open port channel is in an open state; The fluid enters the valve body (17) through the common port channel, flows inside the valve body (17) and flows out through the open normally open port channel; Power-on operation process: External power is supplied to the double coil series structure, which generates an upward electromagnetic attraction; The moving iron core (12) is pulled by the electromagnetic attraction to overcome the thrust of the elastic element at the bottom of the moving iron core (12) and slide upward. The bottom of the moving iron core (12) is separated from and releases the second end of the rocker (19); The first end of the rocker (19) moves downward under the thrust of the elastic element between it and the top surface of the shell (16); The rocker (19) rotates in the opposite direction around the pin (18) under force, and the second end of the rocker (19) is lifted upward synchronously; The first end of the rocker (19) presses down on the first end of the diaphragm (20) located directly below it. The first end of the diaphragm (20) is deformed downward under pressure and adheres to the opening of the normally open port channel, and the normally open port channel is closed; The second end of the diaphragm (20) located directly below the second end of the rocker (19) is released from the press and reset upward, and the opening of the normally closed port channel is in an open state; Fluid enters the valve body (17) through the common port channel, flows inside the valve body (17) and flows out through the open normally closed port channel.

10. The method for operating a dual-coil series-controlled solenoid valve according to claim 9, characterized in that, During the energized operation, the power supply current enters the double coil series structure and flows sequentially through the first coil (4) and the second coil (10) connected in series. The first coil (4) generates a magnetic field when energized. The magnetic field passes through the first winding frame (5) and magnetizes the first fixed iron core (6) inside. The second coil (10) generates a magnetic field when energized. The magnetic field passes through the second winding frame (9) and magnetizes the second fixed iron core (8) inside. The first fixed iron core (6) and the second fixed iron core (8) together gather the magnetic force generated by the magnetic field and converge directly below the double coil series structure to form a vertically upward electromagnetic attraction. The electromagnetic attraction acts vertically on the moving iron core (12) below.

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