Small bistable pulse electromagnetic valve

Abstract

The utility model discloses a small bistable pulse electromagnetic valve, which comprises a valve body, an electromagnetic driving mechanism and a water retaining disc assembly, an inlet channel, a valve cavity and an outlet channel are arranged in the valve body, a water sealing seat is arranged in the valve body, the water retaining disc assembly is arranged in the valve cavity and used for controlling the on-off of the water sealing seat, and the valve cavity is divided into an upper cavity and a lower cavity by the water retaining disc assembly. The water retaining disc assembly comprises a membrane and a water retaining disc, and a through hole is formed in the water retaining disc; a plurality of overflowing holes are formed in the valve seat, the outer circumferential face of the valve seat is tightly attached to the inner circumferential face of the valve cavity, a pressure relief channel is formed between the valve seat and the valve cavity, a middle hole communicated with one end of the pressure relief channel is formed in the middle of the upper end of the valve seat, and the other end of the pressure relief channel is communicated with the outlet channel. The electromagnetic driving mechanism is matched with the valve seat to achieve opening and closing of the pressure relief channel. The electromagnetic valve is smaller in structural size, the switch directly acts on the middle hole of the valve seat, the size affected by parts is smaller and easier to control, the pressure relief opening is directly designed in the cavity of the electromagnetic valve, and the sealing performance is better.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a small bistable pulse solenoid valve. Background Technology

[0002] Existing solenoid valves used to control the on / off state of water circuits have relatively complex structures. Their operation includes three types: normally open water circuit, normally closed water circuit, and on / off switching. The structure of existing solenoid valves on the market is basically composed of components such as a coil, permanent magnet, iron core sleeve, baffle plate, sealing ring, spring, moving iron core, stationary iron core, rubber core, and valve body. The principle is to use a short-time pulse current signal to drive the moving iron core to move, and then the permanent magnet's permanent magnetic property achieves the attraction of the moving iron core, thus achieving the on / off function. A pulse current in the opposite direction of the coil drives the moving iron core and stationary iron core to separate, and the spring force maintains the separation of the moving iron core and stationary iron core, achieving the off state.

[0003] However, existing solenoid valves on the market have the following drawbacks:

[0004] (1) Most products have a large overall structure.

[0005] (2) Pilot-operated solenoid valves have more components to control, their dimensions are more difficult to control, and their failure rate is higher.

[0006] (3) Most pressure relief ports are designed outside the valve body and are sealed by welding, riveting and other methods, which results in higher sealing performance risk, more components and higher development costs.

[0007] Therefore, it is necessary to optimize the existing solenoid valves to address the aforementioned issues. Utility Model Content

[0008] The purpose of this invention is to provide a small bistable pulse solenoid valve. This invention has a smaller structure and volume, the switch acts directly on the valve seat hole, the size affected by the components is smaller and easier to control, and the pressure relief port is designed directly inside the solenoid valve cavity, resulting in better sealing. It also reduces the cost of mold injection and production.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a small bistable pulse solenoid valve, comprising a valve body, an electromagnetic drive mechanism, and a baffle plate assembly. The valve body has an inlet channel, a valve cavity, and an outlet channel connected in sequence. A water-sealing seat is provided between the valve cavity and the outlet channel within the valve body. The baffle plate assembly is disposed within the valve cavity to control the opening and closing of the water-sealing seat. The baffle plate assembly divides the valve cavity into an upper cavity and a lower cavity. The baffle plate assembly includes a diaphragm and a baffle plate disposed on the diaphragm. The baffle plate has a through hole connecting the upper cavity and the lower cavity. It also includes a valve seat disposed above the baffle plate. The valve seat has multiple flow holes. The outer circumferential surface of the valve seat is tightly fitted with the inner circumferential surface of the valve cavity, and a pressure relief channel is formed between them. A central hole connected to one end of the pressure relief channel is opened in the middle of the upper end of the valve seat. The other end of the pressure relief channel is connected to the outlet channel. The electromagnetic drive mechanism cooperates with the valve seat to realize the opening and closing of the pressure relief channel.

[0010] By adopting the above technical solution, in the initial state, the electromagnetic drive mechanism blocks the central hole of the valve seat. Because the upstream medium pressure is greater than the downstream medium pressure, the baffle plate assembly is pressed against the sealing seat by the water pressure, thus blocking the sealing seat. When the electromagnetic drive mechanism is energized, it opens the central hole of the valve seat, allowing the upstream medium to enter the downstream through the pressure relief channel, causing the outlet channel pressure to rise. This, combined with the upstream medium, pushes the baffle plate assembly open, at which point the sealing seat is connected. This structure is smaller in size, the switch acts directly on the central hole of the valve seat instead of the baffle plate assembly, the affected dimensions of the components are fewer and easier to control, and the pressure relief port is designed directly inside the solenoid valve cavity, resulting in better sealing performance. Furthermore, the mold injection and production costs are lower.

[0011] The present invention is further configured such that a pressure relief port is provided vertically on the inner wall of the valve cavity, and a pressure relief hole is provided radially on the side of the valve seat. The two ends of the pressure relief hole are respectively connected to the central hole and the pressure relief port, and the pressure relief hole and the pressure relief port are combined to form the pressure relief channel.

[0012] By adopting the above technical solution, the pressure relief channel consists of a pressure relief port set on the inner wall of the valve cavity and a pressure relief hole set on the valve seat, which is very convenient to process and has better sealing performance.

[0013] The present invention is further configured such that the upper end of the valve body is provided with a positioning protrusion, and the upper end of the valve seat is provided with a positioning groove that matches the positioning protrusion, so that the end of the pressure relief hole away from the central hole is set towards the pressure relief port.

[0014] By adopting the above technical solution, it is easy to quickly and accurately assemble the valve seat and valve body, and ensure the precise connection between the pressure relief hole and the pressure relief port.

[0015] The present invention is further configured such that the valve seat is provided with a first limiting step, the inner wall of the valve cavity is provided with a second limiting step at the position corresponding to the upper end of the pressure relief port, a sealing ring is sandwiched between the first limiting step and the second limiting step, the inner wall of the valve cavity is also provided with a third limiting step, and the outer edge of the diaphragm is sandwiched between the valve seat and the third limiting step.

[0016] By adopting the above technical solution, the pressure relief channel is well sealed.

[0017] The present invention is further configured such that the upper end of the water baffle is provided with an annular flange, and the annular flange and the water baffle form a clearance cavity that communicates with the upper end of the through hole.

[0018] By adopting the above technical solution, it can not only fit tightly with the diaphragm, but also prevent the through holes from being blocked when the baffle plate is formed.

[0019] The present invention is further configured such that the electromagnetic drive mechanism includes a mounting frame, a winding frame mounted on the mounting frame, a coil wound on the winding frame, a guide hole located at the center of the winding frame, a stationary iron core fixedly located in the guide hole, a movable iron core movably located in the guide hole, and a return spring located between the stationary iron core and the movable iron core. When the coil is de-energized, the movable iron core blocks the middle hole by pressing against the upper end of the middle hole under the action of the return spring. When the coil is energized, the movable iron core moves upward and opens the middle hole.

[0020] By adopting the above technical solution, when the coil is energized, the moving iron core moves upward and opens the valve seat hole. When the coil is de-energized, the moving iron core moves downward under the action of the return spring and blocks the valve seat hole, thus realizing the opening and closing of the valve seat hole.

[0021] The present invention is further configured such that the mounting bracket, valve seat and valve body are connected by fasteners, so that the outer edge of the diaphragm is pressed by the valve seat onto the third limiting step.

[0022] By adopting the above technical solution, the disassembly and assembly operations are very convenient, which is beneficial for the early assembly and production as well as the later maintenance operations. Attached Figure Description

[0023] Figure 1 This is a perspective view of the entire utility model;

[0024] Figure 2 This is a cross-sectional view of the entire utility model;

[0025] Figure 3 This is a cross-sectional view of the valve body of this utility model;

[0026] Figure 4 This is a schematic diagram of the valve seat of this utility model;

[0027] Figure 5This is a cross-sectional view of the valve seat of this utility model.

[0028] In the diagram: 1. Valve body; 2. Electromagnetic drive mechanism; 3. Water baffle assembly; 4. Inlet channel; 5. Valve cavity; 6. Outlet channel; 7. Sealing seat; 8. Upper cavity; 9. Lower cavity; 10. Diaphragm; 11. Water baffle; 12. Through hole; 13. Valve seat; 14. Flow hole; 15. Pressure relief channel; 16. Central hole; 17. Pressure relief port; 18. Pressure relief hole; 19. Positioning protrusion; 20. Positioning groove; 21. First limiting step; 22. Second limiting step; 23. Sealing ring; 24. Third limiting step; 25. Annular flange; 26. Relief cavity; 27. Mounting bracket; 28. Winding bracket; 29. ​​Coil; 30. Guide hole; 31. Stationary iron core; 32. Moving iron core; 33. Return spring; 34. Fastener. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example: As attached Figures 1-5The illustrated small bistable pulse solenoid valve includes a valve body 1, an electromagnetic drive mechanism 2, and a baffle plate assembly 3. The valve body 1 has an inlet channel 4, a valve chamber 5, and an outlet channel 6 connected sequentially. A water-sealing seat 7 is integrally provided between the valve chamber 5 and the outlet channel 6 within the valve body 1. The baffle plate assembly 3 is disposed within the valve chamber 5 to control the opening and closing of the water-sealing seat 7. The baffle plate assembly 3 divides the valve chamber 5 into an upper chamber 8 and a lower chamber 9. The baffle plate assembly 3 includes a diaphragm 10 and a baffle plate 11 disposed on the diaphragm 10. More specifically, the diaphragm 10 has a hook-shaped connecting post, and the baffle plate 11... The valve has a connecting hole for the barbed connecting post to pass through, and the baffle plate 11 has a through hole 12 connecting the upper cavity 8 and the lower cavity 9. The solenoid valve also includes a valve seat 13 disposed above the baffle plate 11. The valve seat 13 has multiple flow holes 14. The outer circumferential surface of the valve seat 13 is tightly fitted with the inner circumferential surface of the valve cavity 5, and a pressure relief channel 15 is formed between the two. The upper middle part of the valve seat 13 has a central hole 16 that communicates with one end of the pressure relief channel 15. The other end of the pressure relief channel 15 is connected to the outlet channel 6. The electromagnetic drive mechanism 2 cooperates with the valve seat 13 to realize the opening and closing of the pressure relief channel 15. In the initial state, the electromagnetic drive mechanism 2 blocks the central hole 16 of the valve seat 13. Because the upstream medium pressure is greater than the downstream medium pressure, the baffle plate assembly 3 is pressed against the sealing seat 7 by the water pressure, thus blocking the sealing seat 7. When the electromagnetic drive mechanism 2 is energized, it opens the central hole 16 of the valve seat 13, and the upstream medium enters the downstream through the pressure relief channel 15, causing the pressure in the outlet channel 6 to increase. This, combined with the upstream medium, pushes the baffle plate assembly 3 open, at which point the sealing seat 7 becomes conductive. This structure is smaller in size, and the switch acts directly on the central hole 16 of the valve seat 13 instead of the baffle plate assembly 3. The size of the components affected is smaller and easier to control. Furthermore, the pressure relief port 17 is directly designed inside the electromagnetic valve cavity 5, resulting in better sealing performance and lower mold injection and production costs.

[0031] As attached Figures 2-5 As shown, the inner wall of the valve cavity 5 is vertically provided with a pressure relief port 17, i.e., it has a vertical groove structure. The side of the valve seat 13 is radially provided with a pressure relief hole 18. The two ends of the pressure relief hole 18 are respectively connected to the central hole 16 and the pressure relief port 17, and the pressure relief hole 18 and the pressure relief port 17 are combined to form the pressure relief channel 15. The pressure relief channel 15 is composed of the pressure relief port 17 provided on the inner wall of the valve cavity 5 and the pressure relief hole 18 provided on the valve seat 13, which is very convenient to manufacture and has better sealing performance.

[0032] As attached Figures 2-4 As shown, the valve body 1 has a positioning protrusion 19 on its upper end, and the valve seat 13 has a positioning groove 20 on its upper end that matches the positioning protrusion 19, so that the end of the pressure relief hole 18 away from the central hole 16 is set towards the pressure relief port 17. This design facilitates quick and precise assembly between the valve seat 13 and the valve body 1, and ensures precise alignment between the pressure relief hole 18 and the pressure relief port 17.

[0033] As attached Figure 2 As shown, the valve seat 13 is provided with a first limiting step 21, and the inner wall of the valve cavity 5 is provided with a second limiting step 22 at the position corresponding to the upper end of the pressure relief port 17. A sealing ring 23 is sandwiched between the first limiting step 21 and the second limiting step 22. The inner wall of the valve cavity 5 is also provided with a third limiting step 24, and the outer edge of the diaphragm 10 is sandwiched between the valve seat 13 and the third limiting step 24. This ensures good sealing performance of the pressure relief channel 15.

[0034] As attached Figure 2 As shown, the upper end of the baffle plate 11 is provided with an annular flange 25, and a clearance cavity 26 is formed between the annular flange 25 and the baffle plate 11, which communicates with the upper end of the through hole 12. This design not only allows for a tight fit with the diaphragm 10, but also prevents the through hole 12 from being blocked when the baffle plate 11 is formed.

[0035] As attached Figure 2 As shown, the electromagnetic drive mechanism 2 includes a mounting frame 27, a winding frame 28 mounted on the mounting frame 27, a coil 29 wound on the winding frame 28, a guide hole 30 located at the center of the winding frame 28, a stationary iron core 31 fixedly disposed within the guide hole 30, a movable iron core 32 movably disposed within the guide hole 30, and a return spring 33 disposed between the stationary iron core 31 and the movable iron core 32. When the coil 29 is de-energized, the movable iron core 32, under the action of the return spring 33, abuts against the upper end of the central hole 16, blocking the central hole 16. When the coil 29 is energized, the movable iron core 32 moves upward and opens the central hole 16. When the coil 29 is de-energized, the movable iron core 32 moves upward, opening the central hole 16 of the valve seat 13. When the coil 29 is de-energized, the movable iron core 32, under the action of the return spring 33, moves downward, blocking the central hole 16 of the valve seat 13, thus realizing the opening and closing of the central hole 16 of the valve seat 13.

[0036] As attached Figure 1 and attached Figure 2 As shown, the mounting bracket 27, valve seat 13, and valve body 1 are connected by fasteners 34, such as screws or bolts, so that the outer edge of the diaphragm 10 is pressed against the third limiting step 24 by the valve seat 13. This design makes disassembly and assembly very convenient, which is beneficial for the initial assembly and production as well as the subsequent maintenance.

Claims

1. A small bistable pulse solenoid valve, comprising a valve body (1), an electromagnetic drive mechanism (2), and a baffle plate assembly (3), wherein the valve body (1) is provided with an inlet channel (4), a valve chamber (5), and an outlet channel (6) connected in sequence, and a sealing seat (7) is provided between the valve chamber (5) and the outlet channel (6) in the valve body (1), the baffle plate assembly (3) is disposed in the valve chamber (5) for controlling the opening and closing of the sealing seat (7), the baffle plate assembly (3) divides the valve chamber (5) into an upper chamber (8) and a lower chamber (9), the baffle plate assembly (3) includes a diaphragm (10) and a baffle plate (11) disposed on the diaphragm (10), the baffle plate (11) being provided with a through hole (12) connecting the upper chamber (8) and the lower chamber (9); characterized in that: It also includes a valve seat (13) disposed above the baffle plate (11). The valve seat (13) is provided with multiple flow holes (14). The outer circumferential surface of the valve seat (13) is tightly fitted with the inner circumferential surface of the valve cavity (5), and a pressure relief channel (15) is formed between the two. A central hole (16) connected to one end of the pressure relief channel (15) is opened in the middle of the upper end of the valve seat (13). The other end of the pressure relief channel (15) is connected to the outlet channel (6). The electromagnetic drive mechanism (2) cooperates with the valve seat (13) to realize the opening and closing of the pressure relief channel (15).

2. The miniature bistable pulse solenoid valve according to claim 1, characterized in that: The valve cavity (5) has a pressure relief port (17) arranged vertically on its inner wall, and the valve seat (13) has a pressure relief hole (18) arranged radially on its side. The two ends of the pressure relief hole (18) are connected to the central hole (16) and the pressure relief port (17) respectively, and the pressure relief hole (18) and the pressure relief port (17) together form the pressure relief channel (15).

3. A small bistable pulse solenoid valve according to claim 2, characterized in that: The valve body (1) has a positioning protrusion (19) at its upper end, and the valve seat (13) has a positioning groove (20) at its upper end that matches the positioning protrusion (19), so that the end of the pressure relief hole (18) away from the central hole (16) is set towards the pressure relief port (17).

4. A small bistable pulse solenoid valve according to claim 2, characterized in that: The valve seat (13) is provided with a first limiting step (21), and the inner wall of the valve cavity (5) is provided with a second limiting step (22) at the position corresponding to the upper end of the pressure relief port (17). A sealing ring (23) is sandwiched between the first limiting step (21) and the second limiting step (22). The inner wall of the valve cavity (5) is also provided with a third limiting step (24), and the outer edge of the diaphragm (10) is sandwiched between the valve seat (13) and the third limiting step (24).

5. A small bistable pulse solenoid valve according to claim 4, characterized in that: The upper end of the baffle plate (11) is provided with an annular flange (25), and the annular flange (25) and the baffle plate (11) form a relief cavity (26) that communicates with the upper end of the through hole (12).

6. A small bistable pulse solenoid valve according to claim 1, characterized in that: The electromagnetic drive mechanism (2) includes a mounting frame (27), a winding frame (28) set on the mounting frame (27), a coil (29) wound on the winding frame (28), a guide hole (30) set at the center of the winding frame (28), a stationary iron core (31) fixedly set in the guide hole (30), a movable iron core (32) movably set in the guide hole (30), and a reset spring (33) set between the stationary iron core (31) and the movable iron core (32). When the coil (29) is de-energized, the movable iron core (32) blocks the middle hole (16) by pressing against the upper end of the middle hole (16) under the action of the reset spring (33). When the coil (29) is energized, the movable iron core (32) moves upward and opens the middle hole (16).

7. A small bistable pulse solenoid valve according to claim 6, characterized in that: The mounting bracket (27), valve seat (13) and valve body (1) are connected by fasteners (34), so that the outer edge of the diaphragm (10) is pressed by the valve seat (13) onto the third limiting step (24).

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