Double diaphragm electromagnetic valve with integrated commutating flow passage structure

Abstract

The application relates to the technical field of electromagnetic valves, in particular to a double-diaphragm electromagnetic valve with an integrated reversing flow channel structure, which comprises a valve body, valve covers located on the top and bottom of the valve body, a valve cavity is formed in the valve body, a plurality of first-stage outflow cavities, second-stage outflow cavities and third-stage outflow cavities are formed in the inner wall of the valve cavity and penetrate through the valve body, and an inflow cavity is formed in one side of the valve body and communicates with the top and bottom of the valve cavity; the application can realize multi-grade flow grading control in a single valve through linkage of upper and lower diaphragms, dislocation sliding of inner and outer sliding sleeves and cooperation of the plurality of outflow cavities, the non-working flow channel is automatically blocked, a single valve is used to replace a multi-valve combination, the system layout is simplified and the application range is widened, integrated reversing flow channels and double-diaphragm differential driving are adopted, the diaphragm is opened and closed under the action of a pressure difference and a spring, flow channel switching, reversing and sealing are synchronously completed, the pressure transmission path is short, the response is rapid, and the multi-stage sealing and staggered opening structure effectively reduces the medium leakage risk.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve technology, and more particularly to a dual-diaphragm solenoid valve with an integrated reversing flow channel structure. Background Technology

[0002] Diaphragm solenoid valves use an elastic diaphragm as the core opening, closing, and sealing component. They control the pressure change in the chamber through electromagnetic drive and use the pressure difference on both sides of the diaphragm to switch the valve port on and off. The flow channel is opened and closed by relying on the elastic deformation of the diaphragm itself and the cooperation of the reset component. They have the characteristics of simple structure, good sealing performance, not easy to blockage, and wide range of applicable media. They are widely used in the automatic on / off and reversing control of various fluid pipelines.

[0003] Currently, conventional diaphragm solenoid valves mostly adopt a single diaphragm structure combined with a straight-through flow channel design, which generally suffers from the problem of a single flow regulation mode and fixed gear. They can only achieve two working states: fully open or fully closed, making it difficult to achieve switching and output of multiple gears and different flow rates within the same valve body.

[0004] In applications requiring tiered liquid supply or variable flow control, the only way to meet the demand is often to use multiple solenoid valves of different diameters in parallel. This not only makes the pipeline system structure complex and the assembly process cumbersome, but also increases the overall installation space, increases the probability of pipeline leaks and failures, and increases system cost and control complexity. It is impossible to meet the dual requirements of compact layout and multi-stage flow control.

[0005] To address the aforementioned technical deficiencies, a solution is proposed that aims to provide a dual-diaphragm linkage corresponding to the misaligned sliding of the sliding sleeve and the coordination of the staged outflow chamber, thereby achieving single-valve multi-level flow control, simplifying system layout and broadening the scope of application. Summary of the Invention

[0006] The purpose of this invention is to provide a dual-diaphragm solenoid valve with an integrated reversing flow channel structure to solve the aforementioned technical defects.

[0007] The objective of this invention can be achieved through the following technical solution: a dual-diaphragm solenoid valve with an integrated reversing flow channel structure, including a valve body and valve covers located on the top and bottom sides of the valve body. The valve body has a valve cavity inside, and the inner wall of the valve cavity has multiple primary, secondary and tertiary outflow cavities that penetrate the valve body. An inflow cavity communicating with the top and bottom sides of the valve cavity is provided on one side of the valve body.

[0008] The valve body and the two sets of valve covers are respectively equipped with an upper diaphragm and a lower diaphragm for sealing the top and bottom sides of the valve cavity. The valve cavity is provided with an inner sliding sleeve that cooperates with the lower diaphragm to open the first-stage outflow cavity, and an outer sliding sleeve that cooperates with the upper diaphragm to open the second-stage outflow cavity. The inner sliding sleeve and the outer sliding sleeve cooperate to open the third-stage outflow cavity.

[0009] Preferably, the inner diameter of the secondary outlet cavity is larger than that of the primary outlet cavity and smaller than that of the tertiary outlet cavity.

[0010] Preferably, pressure plates are fixedly installed on the opposite sides of the upper and lower diaphragms, and the diameter of the pressure plates is larger than the diameter of the valve cavity. A telescopic guide rod is installed between the pressure plate and the valve cover, and a spring is sleeved on the outside of the telescopic guide rod.

[0011] Preferably, the upper diaphragm and the outer sliding sleeve, as well as the lower diaphragm and the inner sliding sleeve, are fixedly connected by multiple connecting rods, and the upper diaphragm and the lower diaphragm are each provided with an opening on one side of the inlet cavity.

[0012] Preferably, the valve cover has a main flow chamber inside, and a pilot hole communicating with the valve chamber is provided on the main flow chamber. A valve stem is slidably connected to the valve cover, and a sealing gasket for sealing the pilot hole is installed at one end of the valve stem. An electromagnetic head for driving the valve stem to rise and fall is installed on the valve cover.

[0013] Preferably, the inner and outer sides of the outer sliding sleeve are respectively sealed and slidably connected to the inner sliding sleeve and the valve cavity. A fixing plate is slidably connected to the side of the valve cavity away from the third-stage outlet cavity, and the fixing plate is sealed and slidably connected to the inner and outer sliding sleeves. Semicircular partitions that are sealed and slidably connected to the inner wall of the inner sliding sleeve are fixedly connected to both sides of the fixing plate, and the two sets of semicircular partitions are staggered on the upper and lower sides of the first-stage outlet cavity.

[0014] Preferably, the inner and outer sliding sleeves are provided with a primary opening and a secondary opening on their respective sides, and the primary and secondary openings are staggered vertically. A tertiary opening is provided through the upper part of the inner wall of the inner sliding sleeve, and a crescent-shaped opening is provided through the lower part of the inner wall of the outer sliding sleeve.

[0015] Preferably, an arc-shaped plate is fixedly connected to the bottom side of the semi-circular partition above, which is in a sealing and sliding connection with the inner wall of the inner sleeve.

[0016] The beneficial effects of this invention are as follows:

[0017] (1) This invention achieves a clear and controllable graded flow effect of small flow, medium flow and large flow in a single valve body by means of two sets of diaphragms that are linked to the inner and outer sliding sleeves to make staggered sliding movements, and with the first, second and third stage flow chambers with progressively increasing inner diameter. By controlling the on and off combinations of different electromagnetic heads, the corresponding flow level can be opened independently, and the other flow chambers will be automatically blocked by the sliding sleeve. It can ensure accurate and stable output under small flow conditions, and can also achieve rapid flow and emptying under large flow conditions. The single valve structure replaces the traditional multi-valve combination flow regulation method, which simplifies the system layout and broadens the scope of application.

[0018] (2) The present invention also adopts the combination of internal reversing flow channel and dual diaphragm differential pressure drive. The diaphragm completes the opening and closing action under the combined action of chamber pressure difference and reset spring. Flow channel switching, pressure reversal and port sealing can be realized simultaneously. The diaphragm movement directly drives the inner and outer sliding sleeves through the connecting rod. The pressure transmission path is short and there is no intermediate loss. The reversing response is faster. At the same time, the sliding sleeve and valve cavity and partition form a multi-stage sliding seal cooperation. With the staggered port structure, the risk of medium leakage is effectively reduced during opening, closing and reversing. Attached Figure Description

[0019] The invention will now be further described with reference to the accompanying drawings;

[0020] Figure 1 This is a schematic diagram of the structure of the present invention;

[0021] Figure 2 This is a structural schematic diagram from another perspective of the present invention;

[0022] Figure 3 This is a schematic diagram of the internal structure of the valve body of the present invention;

[0023] Figure 4 This is a cross-sectional view of the valve body of the present invention. Figure 1 ;

[0024] Figure 5 This is a cross-sectional view of the valve body of the present invention. Figure 2 ;

[0025] Figure 6 This is a schematic diagram of the sealing of the inner and outer sliding sleeves of the present invention.

[0026] Figure 7 This is a schematic diagram of the cooperation between the inner and outer sliding sleeves of the present invention and the semi-circular partition when they are used for sealing.

[0027] Figure 8 This is a schematic diagram showing the disassembly of the inner and outer sliding sleeves of the present invention;

[0028] Figure 9 This is a schematic diagram of the first-stage outflow cavity of the present invention;

[0029] Figure 10 This is a schematic diagram of the conduction of the secondary outflow cavity of the present invention;

[0030] Figure 11 This is a schematic diagram of the three-stage outflow cavity of the present invention.

[0031] Legend:

[0032] 1. Valve body; 11. Valve chamber; 12. Primary outlet chamber; 13. Secondary outlet chamber; 14. Tertiary outlet chamber; 15. Inlet chamber; 16. Fixing plate; 17. Semicircular partition; 18. Arc-shaped plate;

[0033] 2. Valve cover; 21. Upper diaphragm; 22. Lower diaphragm; 23. Inner sliding sleeve; 24. Outer sliding sleeve; 25. Spring; 26. Orifice; 27. Main flow chamber; 28. Pilot hole; 29. ​​Valve stem; 210. Solenoid head; 211. Primary port; 212. Secondary port; 213. Tertiary port; 214. Crescent port. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] Example 1: Please refer to Figures 1-11 As shown, the problem of difficulty in switching and outputting multiple different flow rates within the same valve body can be solved by the following solution;

[0036] The dual-diaphragm solenoid valve with integrated reversing flow channel structure in this embodiment includes a valve body 1 and valve covers 2 located on the top and bottom sides of the valve body 1. The valve body 1 has a valve cavity 11 inside, which is used to control the discharge of different flow channels. The inner wall of the valve cavity 11 has multiple primary outlet cavities 12, secondary outlet cavities 13 and tertiary outlet cavities 14 that penetrate the valve body 1. The multi-stage outlet cavities are used to achieve multi-level controllable graded outlet effect within a single valve body 1. An inlet cavity 15 communicating with the top and bottom sides of the valve cavity 11 is opened on one side of the valve body 1.

[0037] An upper diaphragm 21 and a lower diaphragm 22 are respectively installed between the valve body 1 and the two sets of valve covers 2 to seal the top and bottom sides of the valve cavity 11. The valve cavity 11 is provided with an inner sliding sleeve 23 that cooperates with the lower diaphragm 22 to open the first-stage outflow cavity 12, and an outer sliding sleeve 24 that cooperates with the upper diaphragm 21 to open the second-stage outflow cavity 13. The inner sliding sleeve 23 and the outer sliding sleeve 24 cooperate to open the third-stage outflow cavity 14. The upper diaphragm 21 and the lower diaphragm 22 respectively link the inner sliding sleeve 23 and the outer sliding sleeve 24 to make staggered sliding movements. With the first-stage outflow cavity 12, the second-stage outflow cavity 13 and the third-stage outflow cavity 14 with progressively increasing inner diameter, a single valve can achieve multi-stage flow control, simplifying the system layout and broadening the scope of application.

[0038] The inner diameter of the secondary outlet cavity 13 is larger than that of the primary outlet cavity 12, but smaller than that of the tertiary outlet cavity 14.

[0039] Pressure plates are fixedly installed on the opposite sides of the upper diaphragm 21 and the lower diaphragm 22, and the diameter of the pressure plate is larger than that of the valve cavity 11. This is used to assist the fit between the diaphragm and the end face of the valve cavity 11, thereby improving the sealing performance during plugging. A telescopic guide rod is installed between the pressure plate and the valve cover 2, and a spring 25 is sleeved on the outside of the telescopic guide rod.

[0040] The upper diaphragm 21 and the outer sliding sleeve 24, as well as the lower diaphragm 22 and the inner sliding sleeve 23, are fixedly connected by multiple connecting rods. The upper diaphragm 21 and the lower diaphragm 22 are both provided with orifices 26 on one side of the inlet chamber 15. The upper diaphragm 21 and the upper valve cover 2 form an upper chamber, and the lower diaphragm 22 and the lower valve cover 2 form a lower chamber. The liquid inlet chamber is connected to the water inlet pipe. The liquid in the liquid inlet chamber flows through the orifices 26 on the upper diaphragm 21 and the lower diaphragm 22 to the corresponding upper and lower chambers. Through the compression force of the spring 25, combined with the hydraulically assisted contact force between the upper diaphragm 21 and the lower diaphragm 22 and the top and bottom sides of the valve chamber 11, high sealing performance is achieved.

[0041] The valve cover 2 has a main flow chamber 27 inside, and a pilot hole 28 communicating with the valve cavity 11 is provided on the main flow chamber 27. A valve stem 29 is slidably connected to the valve cover 2, and a sealing gasket for blocking the pilot hole 28 is installed at one end of the valve stem 29. An electromagnetic head 210 for driving the valve stem 29 to rise and fall is installed on the valve cover 2. When the electromagnetic head 210 is energized, it pulls the corresponding valve stem 29 to cause the sealing gasket to separate from the pilot hole 28. The liquid in the corresponding chamber enters the valve cavity 11 through the corresponding pilot hole 28 and collects, so that a pressure difference is formed on both sides of the diaphragm, which in turn pushes the diaphragm to move to open the top or bottom opening of the valve cavity 11. Then, the inner sliding sleeve 23 moves down or the outer sliding sleeve 24 moves up simultaneously to open the corresponding outflow chamber.

[0042] The inner and outer sides of the outer sliding sleeve 24 are respectively sealed and slidably connected to the inner sliding sleeve 23 and the valve cavity 11. A fixing plate 16 is slidably connected to the side of the valve cavity 11 away from the third-stage outlet cavity 14, and the fixing plate 16 is sealed and slidably connected to the inner sliding sleeve 23 and the outer sliding sleeve 24. Both sides of the fixing plate 16 are fixedly connected to semi-circular partitions 17 that are sealed and slidably connected to the inner wall of the inner sliding sleeve 23. The fixing plate 16 and the semi-circular partitions 17 are used to divide the interior of the valve cavity 11 into two independent cavities. With the help of two sets of pilot holes 28 and diaphragms, the corresponding flow channels can be opened smoothly. The two sets of semi-circular partitions 17 are staggered on the upper and lower sides of the first-stage outlet cavity 12. The staggered semi-circular partitions 17 avoid the problem that the first-stage outlet cavity 12 and the second-stage outlet cavity 13 open simultaneously during the movement of the inner sliding sleeve 23 and the outer sliding sleeve 24.

[0043] The inner sliding sleeve 23 and the outer sliding sleeve 24 are respectively provided with a primary outlet 211 and a secondary outlet 212 on both sides, and the primary outlet 211 and the secondary outlet 212 are staggered vertically. When the lower diaphragm 22 moves down, the inner sliding sleeve 23 moves down synchronously through the connecting rod. The primary outlet 211 on the inner sliding sleeve 23 and the primary outlet 211 on the outer sliding sleeve 24 are connected to the primary outlet cavity 12. The secondary outlet 212 on the inner sliding sleeve 23 is connected to the secondary outlet 212 on the outer sliding sleeve 24 and is located below the secondary outlet cavity 13. It is discharged only through the primary outlet cavity 12 with a small flow rate.

[0044] As the upper diaphragm 21 moves upward, the outer sliding sleeve 24 moves upward synchronously via the connecting rod. The secondary outlet 212 on the inner sliding sleeve 23 and the secondary outlet 212 on the outer sliding sleeve 24 are connected to the secondary outlet cavity 13. The primary outlet 211 on the inner sliding sleeve 23 is connected to the primary outlet 211 on the outer sliding sleeve 24 and is located above the primary outlet cavity 12. The flow is discharged only through the secondary outlet cavity 13.

[0045] A three-stage through-hole 213 is provided through the upper part of the inner wall of the inner sleeve 23, and a crescent-shaped through-hole 214 is provided through the lower part of the inner wall of the outer sleeve 24. The crescent-shaped through-hole 214 on the outer sleeve 24 is used to prevent the three-stage through-hole 213 and the crescent-shaped through-hole 214 from communicating with the three-stage outflow cavity 14 when either the inner sleeve 23 or the outer sleeve 24 moves. When the inner sleeve 23 moves down and the outer sleeve 24 moves up, the inner sleeve 23 blocks the secondary through-hole 212 on the outer sleeve 24, and the outer sleeve 24 blocks the primary through-hole 211 on the inner sleeve 23. The three-stage through-hole 213 and the crescent-shaped through-hole 214 communicate with the three-stage outflow cavity 14, and the large flow is discharged only through the three-stage outflow cavity 14.

[0046] An arc-shaped plate 18 is fixedly connected to the bottom side of the upper semi-circular partition 17 and is slidably sealed to the inner wall of the inner sliding sleeve 23. When both the upper diaphragm 21 and the lower diaphragm 22 block the valve cavity 11, the three-stage port 213 and the crescent port 214 are located on the upper and lower sides respectively. At this time, the inner sliding sleeve 23 blocks the first-stage port 211 on the outer sliding sleeve 24, the outer sliding sleeve 24 blocks the second-stage port 212 on the inner sliding sleeve 23, and the arc-shaped plate 18 blocks the bottom part of the three-stage outlet cavity 14 to prevent the upper and lower sides of the semi-circular partition 17 from communicating through the three-stage outlet cavity 14, maintain the independent sealing of the two sections, so as to smoothly discharge different flow rates through the corresponding outlet cavity.

[0047] Example 2: Please refer to Figures 1-11 As shown, the present invention also proposes a method for using a dual-diaphragm solenoid valve with an integrated reversing flow channel structure, comprising the following steps:

[0048] Step 1: The liquid inlet chamber is connected to the water inlet pipe. The liquid in the liquid inlet chamber flows through the orifice 26 on the upper diaphragm 21 and the lower diaphragm 22 to the upper chamber formed between the upper diaphragm 21 and the upper valve cover 2, and the lower chamber formed between the lower diaphragm 22 and the lower valve cover 2. The hydraulic assists the contact force between the upper diaphragm 21 and the lower diaphragm 22 and the top and bottom sides of the valve chamber 11, combined with the compression force of the spring 25, to achieve high sealing performance.

[0049] Step 2: Opening the primary outlet chamber 12: Powering on the lower electromagnetic head 210 pulls the lower valve stem 29 downwards. The sealing gasket on the valve stem 29 separates from the pilot hole 28. The liquid in the lower chamber enters the lower pilot hole 28 through the main flow chamber 27, and then flows to the valve chamber 11 below the semi-circular partition 17 to collect. The pressure in the lower chamber decreases accordingly, creating a pressure difference between the upper and lower parts of the lower diaphragm 22. Under the action of the pressure difference, the liquid pressure pushes the lower diaphragm 22 downwards and compresses the spring 25, opening the bottom opening of the valve chamber 11. At the same time as the lower diaphragm 22 moves downwards, the inner sliding sleeve 23 moves downwards synchronously through the connecting rod. The primary port 211 on the inner sliding sleeve 23 and the primary port 211 on the outer sliding sleeve 24 are connected to the primary outlet chamber 12. The secondary port 212 on the inner sliding sleeve 23 is connected to the secondary port 212 on the outer sliding sleeve 24 and is located below the secondary outlet chamber 13. Only a small flow rate is discharged through the primary outlet chamber 12.

[0050] After the lower electromagnetic head 210 is de-energized, the valve stem 29 resets, the sealing gasket blocks the corresponding pilot hole 28, and some liquid enters the lower chamber through the orifice 26. The pressure in the lower chamber increases, and combined with the compression force of the spring 25, the lower diaphragm 22 forms a pressure difference with a lower upper and a higher lower. The fluid pressure pushes the lower diaphragm 22 to move upward, blocking the bottom opening of the valve chamber 11 and closing the first-stage outflow chamber 12.

[0051] Step 3: Opening the secondary outlet chamber 13: Power on the upper electromagnetic head 210 to pull the upper valve stem 29 upward. The sealing gasket on the valve stem 29 separates from the pilot hole 28. The liquid in the upper chamber enters the upper pilot hole 28 through the main flow chamber 27 and then flows to the valve chamber 11 above the semi-circular partition 17 to collect. The pressure in the upper chamber decreases accordingly, creating a pressure difference between the upper diaphragm 21 and the lower diaphragm. Under the action of the pressure difference, the liquid pressure pushes the upper diaphragm 21 upward and compresses the spring 25, opening the top opening of the valve chamber 11. As the upper diaphragm 21 moves upward, it drives the outer sliding sleeve 24 to move upward synchronously through the connecting rod. The secondary port 212 on the inner sliding sleeve 23 and the secondary port 212 on the outer sliding sleeve 24 are connected to the secondary outlet chamber 13. The primary port 211 on the inner sliding sleeve 23 is connected to the primary port 211 on the outer sliding sleeve 24 and is located above the primary outlet chamber 12. The liquid is discharged only through the flow in the secondary outlet chamber 13.

[0052] After the upper electromagnetic head 210 is de-energized, the valve stem 29 resets, the sealing gasket blocks the corresponding pilot hole 28, and some liquid enters the upper chamber through the orifice 26. The pressure in the upper chamber increases, and combined with the compression force of the spring 25, the upper diaphragm 21 forms a pressure difference with a higher upper part and a lower lower part. The fluid pressure pushes the upper diaphragm 21 to move down, blocking the top opening of the valve chamber 11 and closing the secondary outlet chamber 13.

[0053] Step 4: Opening of the three-stage outflow chamber 14: The two sets of electromagnetic heads 210 are energized, pulling the corresponding valve stem 29 to separate the sealing gasket from the pilot hole 28. The liquid in the upper chamber and the lower chamber enters the valve chamber 11 through the corresponding pilot hole 28 and converges, so that a pressure difference is formed on both sides of the upper diaphragm 21 and the lower diaphragm 22. The top and bottom sides of the valve chamber 11 are opened, and the liquid enters the valve chamber 11 quickly from both sides. The inner sliding sleeve 23 moves down and the outer sliding sleeve 24 moves up. The inner sliding sleeve 23 blocks the secondary port 212 on the outer sliding sleeve 24, and the outer sliding sleeve 24 blocks the primary port 211 on the inner sliding sleeve 23. The tertiary port 213 and the crescent port 214 are connected to the three-stage outflow chamber 14, and the liquid is discharged in large flow only through the three-stage outflow chamber 14.

[0054] After the two sets of electromagnetic heads 210 are de-energized, the valve stem 29 resets, the sealing gasket blocks the corresponding pilot hole 28, and some liquid enters the upper and lower chambers through the orifice 26. The pressure in the upper and lower chambers increases, and combined with the compression force of the spring 25, the fluid pressure pushes the upper diaphragm 21 down and the lower diaphragm 22 to move relative to each other, blocking the openings on both sides of the top and bottom of the valve chamber 11 and closing the three-stage outflow chamber 14.

[0055] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A double diaphragm electromagnetic valve integrated with a commutating flow channel structure, comprising a valve body (1), and valve covers (2) located on the top and bottom sides of the valve body (1), characterized in that, The valve body (1) has a valve cavity (11) inside, and a plurality of primary outlet cavities (12), secondary outlet cavities (13) and tertiary outlet cavities (14) penetrating the valve body (1) are provided on the inner wall of the valve cavity (11). An inlet cavity (15) communicating with the top and bottom sides of the valve cavity (11) is provided on one side of the valve body (1). The valve body (1) and the two sets of valve covers (2) are respectively equipped with an upper diaphragm (21) and a lower diaphragm (22) for sealing the top and bottom sides of the valve cavity (11). The valve cavity (11) is provided with an inner sliding sleeve (23) that cooperates with the lower diaphragm (22) to open the first-stage outflow cavity (12), and an outer sliding sleeve (24) that cooperates with the upper diaphragm (21) to open the second-stage outflow cavity (13). The inner sliding sleeve (23) and the outer sliding sleeve (24) cooperate to open the third-stage outflow cavity (14).

2. The dual-diaphragm solenoid valve with integrated reversing flow channel structure according to claim 1, characterized in that, The inner diameter of the secondary outlet cavity (13) is larger than that of the primary outlet cavity (12) and smaller than that of the tertiary outlet cavity (14).

3. The dual-diaphragm solenoid valve with an integrated reversing flow channel structure according to claim 1, characterized in that, Pressure plates are fixedly installed on the opposite sides of the upper diaphragm (21) and the lower diaphragm (22), and the diameter of the pressure plate is larger than the diameter of the valve cavity (11). A telescopic guide rod is installed between the pressure plate and the valve cover (2), and a spring (25) is sleeved on the outside of the telescopic guide rod.

4. The dual-diaphragm solenoid valve with integrated reversing flow channel structure according to claim 3, characterized in that, The upper diaphragm (21) and the outer sliding sleeve (24) and the lower diaphragm (22) and the inner sliding sleeve (23) are all fixedly connected by multiple connecting rods. The upper diaphragm (21) and the lower diaphragm (22) are both provided with orifices (26) on one side of the inlet cavity (15).

5. The dual-diaphragm solenoid valve with integrated reversing flow channel structure according to claim 1, characterized in that, The valve cover (2) has a main flow chamber (27) inside, and a pilot hole (28) communicating with the valve chamber (11) is provided on the main flow chamber (27). A valve stem (29) is slidably connected to the valve cover (2), and a sealing gasket for blocking the pilot hole (28) is installed at one end of the valve stem (29). An electromagnetic head (210) for driving the valve stem (29) to rise and fall is installed on the valve cover (2).

6. The dual-diaphragm solenoid valve with integrated reversing flow channel structure according to claim 1, characterized in that, The outer and inner sides of the outer sliding sleeve (24) are respectively sealed and slidably connected to the inner sliding sleeve (23) and the valve cavity (11). A fixing plate (16) is slidably connected to the side of the valve cavity (11) away from the third-stage outlet cavity (14). The fixing plate (16) is sealed and slidably connected to the inner sliding sleeve (23) and the outer sliding sleeve (24). Both sides of the fixing plate (16) are fixedly connected to semi-circular partitions (17) that are sealed and slidably connected to the inner wall of the inner sliding sleeve (23). The two sets of semi-circular partitions (17) are staggered on the upper and lower sides of the first-stage outlet cavity (12).

7. The dual-diaphragm solenoid valve with an integrated reversing flow channel structure according to claim 6, characterized in that, The inner sliding sleeve (23) and the outer sliding sleeve (24) are respectively provided with a first-level opening (211) and a second-level opening (212), and the first-level opening (211) and the second-level opening (212) are staggered vertically. A third-level opening (213) is provided through the upper part of the inner wall of the inner sliding sleeve (23), and a crescent-shaped opening (214) is provided through the lower part of the inner wall of the outer sliding sleeve (24).

8. The dual-diaphragm solenoid valve with an integrated reversing flow channel structure according to claim 7, characterized in that, An arc-shaped plate (18) is fixedly connected to the bottom side of the semi-circular partition (17) above, which is in a sealing and sliding connection with the inner wall of the inner sleeve (23).

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