Normally closed electromagnetic valve
By adopting a multi-layer O-ring sealing structure and a spring return mechanism in the normally closed solenoid valve, the problem of degradation of sealing performance of normally closed solenoid valves in the prior art is solved, and high sealing and long-term use stability are achieved.
Patent Information
- Application Number
- CN202421662652.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-15
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-07-15
AI Technical Summary
After a long time of use, the sealing performance of the existing normally closed solenoid valves will decrease, resulting in liquid leakage and reduce working efficiency.
A normally closed solenoid valve is designed, adopting a multi-layer O-ring sealing structure and a spring return mechanism to ensure that the valve core is highly sealed during opening and closing and avoid liquid leakage.
Through the multi-layer O-ring sealing structure and spring reset mechanism, the sealing performance of the solenoid valve is significantly improved, liquid leakage is avoided, and the service life of the equipment is extended.
Smart Images
Figure CN222880367U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electromagnetic valves, in particular to a normally closed electromagnetic valve. Background Art
[0002] Solenoid valve is an industrial device controlled by electromagnetics. It is a basic component for controlling fluid automation. It is an actuator and is not limited to hydraulic and pneumatic. It is used in industrial control systems to adjust the direction, flow, speed and other parameters of the medium. Solenoid valves can be used with different circuits to achieve the desired control, and the accuracy and flexibility of the control can be guaranteed. There are many types of solenoid valves, and different solenoid valves play a role in different positions in the control system. The most commonly used ones are check valves, safety valves, directional control valves, speed control valves, etc. The normally closed solenoid valve is also one of the products of solenoid valves.
[0003] The normally closed solenoid valve in the prior art has a simple structure and its sealing performance cannot meet good standards. After long-term use, a certain gap will appear between the internal components of the normally closed solenoid valve, which will cause leakage, thereby reducing the working efficiency of the normally closed solenoid valve. In view of the above problems, a solution is proposed below. Utility Model Content
[0004] The utility model aims to provide a normally closed electromagnetic valve, which has the advantages of convenient use and high sealing performance.
[0005] The above technical objectives of the utility model are achieved through the following technical solutions:
[0006] A normally closed solenoid valve comprises a bracket, a coil is arranged in the bracket, a mounting seat is arranged below the bracket, a flow groove is arranged at the lower end of the mounting seat, a plurality of flow holes are arranged on the outer wall of the mounting seat, a normally closed valve seat is arranged in the mounting seat, a normally closed valve core tube is connected to the upper end of the normally closed valve seat, a normally closed static iron core is passed through the normally closed valve core tube, a screw is arranged at the upper end of the bracket, and the normally closed static iron core is fixed to the lower side of the bracket by the screw, a slidable normally closed moving iron core is passed through the normally closed valve core tube, A valve needle spring is also provided in the normally closed valve core tube, and the two ends of the valve needle spring respectively conflict with the lower end of the normally closed static iron core and the upper end of the normally closed moving iron core; a valve core body is provided in the mounting seat, a ejector pin is provided on the inner side of the valve core body, a valve needle gasket is connected to the upper end of the ejector pin, a mounting seat is passed through the lower end of the normally closed moving iron core, and the valve needle gasket is embedded in the lower end of the normally closed moving iron core; a pagoda spring is provided in the mounting seat, and the two ends of the pagoda spring respectively fit with the inner bottom of the mounting seat and the lower end of the normally closed valve seat.
[0007] Preferably, the valve core body includes a valve core seat and a valve core gasket, a valve core gasket body and a valve needle gasket retaining ring are arranged inside the valve core gasket, a valve core retaining ring is sleeved on the outer side of the valve core seat, and the outer side of the valve core retaining ring is in contact with the inner wall of the normally closed valve seat.
[0008] Preferably, an internal thread is provided on the upper side of the mounting seat, an external thread is provided on the lower side of the normally closed valve seat, and the mounting seat and the normally closed valve seat are detachably connected via threads.
[0009] Preferably, a first O-ring is sleeved on the outer side of the normally closed valve seat, and the outer side of the first O-ring is in contact with the inner wall of the mounting seat, and a second O-ring and a third O-ring are sleeved on the outer side of the mounting seat.
[0010] Preferably, a fourth O-ring is provided on the normally closed valve core tube, and the fourth O-ring is located between the bracket and the normally closed valve seat.
[0011] The beneficial effects of the utility model are:
[0012] 1. When the coil is energized, it can generate electromagnetic force, so that the normally closed static iron core can generate magnetic force. When the normally closed static iron core generates magnetic force, it can attract the normally closed moving iron core to slide upward along the inside of the normally closed valve core tube. At this time, the valve needle spring can be squeezed to generate elastic force. When the normally closed moving iron core moves upward, the ejector pin can be pulled upward, and finally the valve core body can be pulled upward. At this time, the pagoda spring is stretched to generate elastic force. When the valve core body moves upward, the flow groove and several flow holes can be connected, so that the solenoid valve can pass water. On the contrary, when the coil is not energized, the valve core body can be driven back to the initial position through the resetting action of the valve needle spring and the pagoda spring, so that the valve core body can fit with the inner bottom of the mounting seat again. At this time, the flow groove and several flow holes are blocked, thereby realizing the normally closed state of the solenoid valve.
[0013] 2. The valve core retaining ring can increase the sealing between the valve core seat and the normally closed valve seat to prevent water from flowing out from between the valve core body and the normally closed valve seat. The valve core gasket body and the valve needle gasket retaining ring can increase the sealing between the valve core gasket and the mounting seat when the solenoid valve is normally closed to prevent water leakage when the solenoid valve is normally closed. The first O-ring can increase the sealing between the normally closed valve seat and the mounting seat after installation to prevent water droplets from flowing out. The second O-ring and the third O-ring can increase the sealing after the solenoid valve is connected to the external pipeline. Therefore, the overall sealing performance of the solenoid valve can be effectively improved to facilitate popularization and use. The fourth O-ring can increase the sealing performance between the bracket and the normally closed valve seat. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 It is a structural schematic diagram of an embodiment;
[0015] Figure 2 It is a structural explosion diagram of an embodiment.
[0016] : Illustration symbols: 1. bracket; 2. coil; 3. mounting seat; 4. flow hole; 5. normally closed valve seat; 6. normally closed valve core tube; 7. normally closed static iron core; 8. screw; 9. normally closed moving iron core; 10. valve needle spring; 11. valve core body; 12. ejector pin; 13. valve needle gasket; 14. pagoda spring; 15. valve core seat; 16. valve core gasket; 17. valve core gasket body; 18. valve needle gasket retaining ring; 19. valve core retaining ring; 20. first O-ring; 21. second O-ring; 22. third O-ring; 23. fourth O-ring. DETAILED DESCRIPTION
[0017] The following is only a preferred embodiment of the present invention, and the protection scope is not limited to this embodiment. All technical solutions under the concept of the present invention should belong to the protection scope of the present invention. The same parts are represented by the same figure marks. It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to the directions in the drawings, and the words "bottom" and "top", "inside" and "outside" refer to the directions toward or away from the geometric center of a specific component, respectively.
[0018] like Figure 1 to Figure 2 As shown, a normally closed solenoid valve comprises a bracket 1, a coil 2 is arranged in the bracket 1, a mounting seat 3 is arranged below the bracket 1, a flow groove is opened at the lower end of the mounting seat 3, a plurality of flow holes 4 are opened on the outer wall of the mounting seat 3, a normally closed valve seat 5 is arranged in the mounting seat 3, a normally closed valve core tube 6 is connected to the upper end of the normally closed valve seat 5, a normally closed static iron core 7 is passed through the normally closed valve core tube 6, a screw 8 is arranged at the upper end of the bracket 1, and the normally closed static iron core 7 is fixed to the lower side of the bracket 1 by the screw 8, when the coil 2 is energized, the coil 2 can generate electromagnetic force, so that the normally closed static iron core 7 can generate magnetic force. A slidable normally closed moving iron core 9 is passed through the normally closed valve core tube 6. A valve needle spring 10 is also arranged in the normally closed valve core tube 6, and the two ends of the valve needle spring 10 respectively conflict with the lower end of the normally closed static iron core 7 and the upper end of the normally closed moving iron core 9. When the normally closed static iron core 7 generates magnetic force, it can attract the normally closed moving iron core 9 to slide upward along the inside of the normally closed valve core tube 6. At this time, the valve needle spring 10 can be squeezed to generate elastic force.
[0019] A valve core body 11 is arranged in the mounting seat 3, and a ejector pin 12 is arranged on the inner side of the valve core body 11. The upper end of the ejector pin 12 is connected to a valve needle gasket 13. The lower end of the normally closed moving iron core 9 passes through the mounting seat 3, and the valve needle gasket 13 is embedded in the lower end of the normally closed moving iron core 9. A pagoda spring 14 is arranged in the mounting seat 3, and the two ends of the pagoda spring 14 are respectively fitted with the inner bottom of the mounting seat 3 and the lower end of the normally closed valve seat 5. When the normally closed moving iron core 9 moves upward, the ejector pin 12 can be pulled upward, and finally the valve core body 11 can be pulled upward. At this time, the pagoda spring 14 is stretched to generate elastic force. When the valve core body 11 moves upward, the flow groove and several flow holes 4 can be connected, so that the water flow work of the solenoid valve can be realized. On the contrary, when the coil 2 is not energized, the valve core body 11 can be driven back to the initial position through the reset action of the valve needle spring 10 and the pagoda spring 14, so that the valve core body 11 can fit with the inner bottom of the mounting seat 3 again. At this time, the flow groove and several flow holes 4 are blocked, thereby realizing the normally closed state of the solenoid valve.
[0020] The valve core body 11 includes a valve core seat 15 and a valve core gasket 16, a valve core gasket body 17 and a valve needle gasket 13 retaining ring are arranged inside the valve core gasket 16, a valve core retaining ring 19 is sleeved on the outer side of the valve core seat 15, and the outer side of the valve core retaining ring 19 is in contact with the inner wall of the normally closed valve seat 5, and the valve core retaining ring 19 can increase the sealing between the valve core seat 15 and the normally closed valve seat 5 to prevent water from flowing out from between the valve core body 11 and the normally closed valve seat 5. The valve core gasket body 17 and the valve needle gasket 13 retaining ring can increase the sealing between the valve core gasket 16 and the mounting seat 3 in the normally closed state of the solenoid valve to prevent water leakage in the normally closed state of the solenoid valve.
[0021] The outer side of the normally closed valve seat 5 is sleeved with a first O-ring 20, and the outer side of the first O-ring 20 is in contact with the inner wall of the mounting seat 3. The first O-ring 20 can increase the sealing performance between the normally closed valve seat 5 and the mounting seat 3 after installation to prevent water droplets from flowing out. The outer side of the mounting seat 3 is sleeved with a second O-ring 21 and a third O-ring 22. The second O-ring 21 and the third O-ring 22 can increase the sealing performance of the solenoid valve after being connected to the external pipeline, thereby effectively improving the overall sealing performance of the solenoid valve for easy promotion and use. The normally closed valve core tube 6 is penetrated with a fourth O-ring 23, and the fourth O-ring 23 is located between the bracket 1 and the normally closed valve seat 5. The fourth O-ring 23 can increase the sealing performance between the bracket 1 and the normally closed valve seat 5.
[0022] An internal thread is provided on the upper side of the mounting seat 3, an external thread is provided on the lower side of the normally closed valve seat 5, and the mounting seat 3 and the normally closed valve seat 5 are detachably connected via threads, and the internal thread and the external thread can facilitate the disassembly and installation of the normally closed valve seat 5 on the mounting seat 3.
[0023] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A normally closed solenoid valve, characterized in that: The invention comprises a bracket (1), wherein a coil (2) is arranged in the bracket (1), a mounting seat (3) is arranged below the bracket (1), a flow groove is arranged at the lower end of the mounting seat (3), a plurality of flow holes (4) are arranged on the outer wall of the mounting seat (3), a normally closed valve seat (5) is arranged in the mounting seat (3), the upper end of the normally closed valve seat (5) is connected to a normally closed valve core tube (6), a normally closed static iron core (7) is passed through the normally closed valve core tube (6), a screw (8) is arranged at the upper end of the bracket (1), and the normally closed static iron core (7) is fixed to the lower side of the bracket (1) by the screw (8), a slidable normally closed moving iron core (9) is passed through the normally closed valve core tube (6), and the normally closed valve core tube ( 6), a valve needle spring (10) is also arranged in it, and the two ends of the valve needle spring (10) are respectively in contact with the lower end of the normally closed static iron core (7) and the upper end of the normally closed moving iron core (9); a valve core body (11) is arranged in the mounting seat (3), a ejector pin (12) is arranged on the inner side of the valve core body (11), and the upper end of the ejector pin (12) is connected to a valve needle gasket (13); the lower end of the normally closed moving iron core (9) is penetrated by the mounting seat (3), and the valve needle gasket (13) is embedded in the lower end of the normally closed moving iron core (9); a pagoda spring (14) is arranged in the mounting seat (3), and the two ends of the pagoda spring (14) are respectively in contact with the inner bottom of the mounting seat (3) and the lower end of the normally closed valve seat (5).
2. A normally closed solenoid valve according to claim 1, characterized in that: The valve core body (11) includes a valve core seat (15) and a valve core gasket (16), wherein the valve core gasket (16) is provided with a valve core gasket body (17) and a valve needle gasket (13) retaining ring, and the outer side of the valve core seat (15) is sleeved with a valve core retaining ring (19), and the outer side of the valve core retaining ring (19) is in contact with the inner wall of the normally closed valve seat (5).
3. A normally closed solenoid valve according to claim 2, characterized in that: The upper side of the mounting seat (3) is provided with an internal thread, the lower side of the normally closed valve seat (5) is provided with an external thread, and the mounting seat (3) and the normally closed valve seat (5) are detachably connected via threads.
4. A normally closed solenoid valve according to claim 3, characterized in that: The outer side of the normally closed valve seat (5) is sleeved with a first O-ring (20), and the outer side of the first O-ring (20) is in contact with the inner wall of the mounting seat (3). The outer side of the mounting seat (3) is sleeved with a second O-ring (21) and a third O-ring (22).
5. A normally closed solenoid valve according to claim 4, characterized in that: A fourth O-ring (23) is passed through the normally closed valve core tube (6), and the fourth O-ring (23) is located between the bracket (1) and the normally closed valve seat (5).