A pressure solenoid valve

Abstract

The present invention relates to the technical field of solenoid valves, and specifically refers to a pressure solenoid valve; it includes a valve body, a valve rod and a pressure cover. An electromagnetic component is provided inside the valve body, and a ventilation hole is provided inside the electromagnetic component. The valve rod is inserted into the ventilation hole and is cooperatively connected with the electromagnetic component. The valve rod, the electromagnetic component and the valve body are integrally formed by a molding process. The upper end of the valve rod penetrates through the upper end surface of the valve body, and a nozzle is provided at the upper end of the valve rod. The pressure cover is cooperatively connected with the nozzle and can move up and down along it. A permanent magnet is provided inside the pressure cover. The structure of the present invention is reasonable. The valve body encapsulates the iron core as a whole, preventing the water vapor passing through the valve rod and the ventilation hole from rusting the iron core. The electromagnetic component is integrally encapsulated inside the valve body. The valve body and the valve rod and the electromagnetic component thereon are integrally formed, which is convenient for assembly, and can effectively improve the insulation performance and service life.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, and particularly to a pressure solenoid valve. Background Art

[0002] For existing cooking appliances such as electric pressure cookers, their solenoid valves utilize the principle that a magnetic valve and an electromagnetic chuck can generate both suction and repulsive forces to achieve stepless adjustment of the pressure limit value of the electric pressure cooker. The implementation method is that when the electromagnetic chuck is not energized, the pressure limit of the electric pressure cooker is determined by the suction force generated by the electromagnetic chuck and the magnetic valve; when the electromagnetic chuck is energized with direct current that increases from small to large, the electromagnetic chuck will generate the same magnetic pole as the adjacent surface of the magnetic valve, and the repulsive force of the same magnetic pole will reduce the suction force between the magnetic valve and the electromagnetic chuck until the generated repulsive force completely lifts the magnetic valve.

[0003] Generally, the insulation between the iron core and the winding of the existing solenoid valve is achieved by enameled wire and insulating tape. In the solenoid valve on the electric pressure cooker, it is easy for water vapor to invade, resulting in a decrease in insulation performance. The water vapor will also cause the iron core to rust, thus affecting the service life of the solenoid valve. The valve rod, solenoid valve, and valve structure of the existing pressure solenoid valve are all independent components, and multiple assemblies are required during the assembly process. Especially for the solenoid valve using the tape insulation layer filling and winding process, if the tape insulation layer is cracked or damaged, it will cause the solenoid valve to be damaged. When used in the high-temperature environment of the electric pressure cooker, there are serious safety problems, and the service life of the product is severely restricted. Therefore, the existing technology still needs to be improved and developed. Summary of the Invention

[0004] The purpose of the present invention is to provide a pressure solenoid valve with reasonable structure, good stability, convenient processing, and long service life in view of the defects and deficiencies of the existing technology.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A pressure solenoid valve of the present invention includes a valve body, a valve rod, and a pressure cover. An electromagnetic assembly is provided inside the valve body, and an air vent is provided inside the electromagnetic assembly. The valve rod passes through the air vent and is cooperatively connected with the electromagnetic assembly. The valve rod, the electromagnetic assembly, and the valve body are integrally formed by a molding process; the upper end of the valve rod penetrates through the upper end surface of the valve body, and a nozzle is provided at the upper end of the valve rod. The pressure cover is cooperatively connected with the nozzle and can move up and down along it. A permanent magnet is provided inside the pressure cover.

[0007] According to the above solution, an exhaust hole is provided on the pressure cover. The upper end of the nozzle is inserted from the lower port of the exhaust hole and passes through the exhaust hole. A pressure relief plate is provided at the upper port of the exhaust hole; a plug is provided on the bottom surface of the pressure relief plate, and the plug is movably abutted against the upper port of the nozzle. A plurality of pressure relief holes are provided on the pressure relief plate.

[0008] According to the above solution, a limiting baffle is provided on the inner wall of the exhaust hole, and a guiding port is formed on the limiting baffle; the air nozzle is movably inserted into the guiding port, and an anti - detachment flange is provided at the upper end of the air nozzle above the limiting baffle.

[0009] According to the above solution, the pressure cover further includes an exhaust hood, the lower port of the exhaust hood is detachably connected to the upper end of the valve body, and a sealing gasket is provided between the lower port of the exhaust hood and the valve body; the pressure cover is arranged in the exhaust hood and is cooperatively connected with the air nozzle, an air outlet hole is provided at the upper end of the exhaust hood, and an impeller is arranged in the air outlet hole, and the impeller is rotatably connected to the exhaust hood.

[0010] According to the above solution, the electromagnetic assembly includes a keel and an iron core. The keel is inserted into the valve body and fixedly connected thereto. A coil is wound around the outer periphery of the keel, a first through - hole is formed at the center of the keel, and the iron core is inserted into the first through - hole and fixedly connected thereto; a second through - hole is formed at the center of the iron core, an inner cylinder is inserted into the second through - hole, the inner cylinder is in close contact with the inner wall of the second through - hole of the iron core, and the lower end of the inner cylinder is connected to the lower end of the keel through an extending structure so as to cover the lower end of the iron core.

[0011] According to the above solution, a shielding cover is provided in the valve body. The shielding cover has an end - face partition part and a circumferential partition part and forms a shielding cavity with an upward opening; the keel, the iron core, the inner cylinder and the coil are all arranged in the shielding cavity of the shielding cover. A magnetic conducting suction cup is provided at the upper end of the iron core, the magnetic conducting suction cup is arranged in the upper port of the shielding cover and the magnetic conducting suction cup is attached to the upper end face of the keel.

[0012] According to the above solution, a ventilation hole is formed at the center of the inner cylinder. The end - face partition part of the shielding cover is attached to the lower end face of the keel. A mating hole is formed on the end - face partition part of the shielding cover. A positioning convex ring is provided on the lower end face of the keel, the positioning convex ring is arranged around the ventilation hole, and the positioning convex ring is inserted into the mating hole to form a hole - shaft fit therewith; the air valve rod is inserted into the ventilation hole, and the lower end of the air valve rod passes through the positioning convex ring and is arranged below the valve body.

[0013] According to the above solution, the valve body is an integrally - formed structure, and the valve body covers the lower end face of the end - face partition part of the shielding cover to be fixedly connected to the lower end of the air valve rod, the valve body covers the outer edge face of the circumferential partition part of the shielding cover to be fixedly connected to the shielding cover, the valve body covers the upper end faces of the keel and the magnetic conducting suction cup to be fixedly connected to the two, and the valve body covers the upper end of the air valve rod to be fixedly connected to it.

[0014] According to the above solution, the pressure solenoid valve is applied to an electric pressure cooker.

[0015] The beneficial effects of the present invention are as follows: The structure of the present invention is reasonable. The valve body encapsulates the iron core as a whole, preventing the iron core from being corroded by the water vapor passing through the air valve rod and the ventilation hole. The electromagnetic component is integrally encapsulated in the valve body. The valve body, the air valve rod thereon, and the electromagnetic component are integrally formed and assembled conveniently, which can effectively improve the insulation performance and service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is the overall structural schematic diagram of the pressure solenoid valve of the present invention;

[0017] Figure 2 is the overall sectional structural schematic diagram of the pressure solenoid valve of the present invention;

[0018] Figure 3 is the exploded structural schematic diagram of the valve body of the present invention;

[0019] Figure 4 is the exploded structural schematic diagram of the pressure cover and the exhaust hood in Embodiment 1 of the present invention;

[0020] Figure 5 is the exploded structural schematic diagram of the pressure cover and the exhaust hood in Embodiment 2 of the present invention;

[0021] Figure 6 is the structural schematic diagram of the electric pressure cooker of the present invention.

[0022] In the figure:

[0023] 1. Valve body; 2. Pressure cover; 3. Electromagnetic component; 4. Shielding cover; 5. Electric pressure cooker; 11. Air valve rod; 12. Air nozzle; 13. Anti-detachment flange; 21. Permanent magnet; 22. Exhaust hole; 23. Pressure relief plate; 24. Plug; 25. Limit baffle; 26. Guide port; 27. Exhaust hood; 28. Sealing gasket; 29. Impeller; 31. Ventilation hole; 32. Keel; 33. Iron core; 34. Coil; 35. First through hole; 36. Second through hole; 37. Inner cylinder; 38. Magnetic suction cup; 39. Positioning convex ring; 41. Matching hole. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The technical solutions of the present invention will be described below with reference to the accompanying drawings and embodiments.

[0025] Embodiment 1

[0026] As Figure 1-6As shown in the figure, a pressure solenoid valve according to the present invention is applied to an electric pressure cooker 5. It includes a valve body 1, a valve rod 11, and a pressure cover 2. An electromagnetic component 3 is provided inside the valve body 1. An air vent 31 is provided inside the electromagnetic component 3. The valve rod 11 is inserted through the air vent 31 and is cooperatively connected with the electromagnetic component 3. The valve rod 11, the electromagnetic component 3, and the valve body 1 are integrally formed by a molding process. The upper end of the valve rod 11 penetrates the upper end surface of the valve body 1, and a nozzle 12 is provided at the upper end of the valve rod 11. The pressure cover 2 is cooperatively connected with the nozzle 12 and can move up and down along it. A permanent magnet 21 is provided inside the pressure cover 2. When the electromagnetic component 3 is energized, magnetic poles are generated, and the electromagnetic component 3 changes the direction and magnitude of the current, cooperating with the permanent magnet 21 to make the pressure cover 2 cooperate with the nozzle 12 to achieve the purpose of cutting off the passage of the valve rod 11.

[0027] When the electromagnetic component 3 is not energized, the pressure cover 2 blocks the nozzle 12 under the action of gravity. When a positive current is passed through the electromagnetic component 3, the electromagnetic component 3 generates a suction force on the permanent magnet 21. At this time, the pressure exerted by the pressure cover 2 on the nozzle 12 becomes stronger, and the lower end of the valve rod 11 communicates with the inner cavity of the electric pressure cooker 5. When the pressure inside the electric pressure cooker 5 is sufficient to push the pressure cover 2, the pressure and gas inside the electric pressure cooker 5 are released to the outside through the valve rod 11 and the nozzle 12. Then, when the pressure inside the electric pressure cooker 5 drops, the pressure cover 2 blocks the nozzle 12 again to repeat the above process.

[0028] When a reverse current is passed through the electromagnetic component 3, the electromagnetic component 3 drives the pressure cover 2 to rise along the nozzle 12 to release the pressure inside the electric pressure cooker 5. In particular, the magnitude of the electromagnetic force generated by the electromagnetic component 3 can be adjusted, so as to realize the stepless adjustment function of the working pressure of the electric pressure cooker 5.

[0029] Furthermore, a display module is provided on the electric pressure cooker 5, and the display module can real-time display the set pressure value, real-time pressure value, and temperature value of the electric pressure cooker 5.

[0030] Preferably, the valve rod 11 is inserted through the air vent 31, and the valve rod 11 and the air vent 31 are spaced apart from the electromagnetic component 3. The water vapor flowing through the air vent 31 and the valve rod 11 will not enter the electromagnetic component 3, thereby effectively improving the insulation performance and stability of the pressure solenoid valve.

[0031] An exhaust hole 22 is provided on the pressure cover 2. The upper end of the nozzle 12 is inserted into the lower port of the exhaust hole 22 and passes through the exhaust hole 22. A pressure relief plate 23 is provided at the upper port of the exhaust hole 22. A plug 24 is provided on the bottom surface of the pressure relief plate 23. The plug 24 is movably abutted against the upper port of the nozzle 12, and a plurality of pressure relief holes are provided on the pressure relief plate 23. As shown in the appendix Figure 2 、 3As shown, the plug 24 can adopt a conical structure, and the upper port of the air nozzle 12 adopts a flared shape. The air nozzle 12 is inserted into the exhaust hole 22 so that the pressure cover 2 can move up and down along the air nozzle 12. Under the action of gravity, the plug 24 on the pressure relief plate 23 can block the air nozzle 12. When the pressure in the air valve rod 11 exceeds the acting force generated by the electromagnetic assembly 3, the pressure cover 2 is pushed up by the air pressure, and the pressure in the electric pressure cooker 5 is discharged outward through the air valve rod 11, the air nozzle 12 and the exhaust hole 22 to release the pressure.

[0032] A limiting baffle 25 is provided on the inner wall of the exhaust hole 22, and a guiding port 26 is opened on the limiting baffle 25; the air nozzle 12 is movably inserted into the guiding port 26, and an anti-detachment flange 13 is provided at the upper end of the air nozzle 12 above the limiting baffle 25. The limiting baffle 25 can be made of an elastic material to facilitate the anti-detachment flange 13 to pass through the guiding port 26 during installation. The limiting baffle 25 is used to limit the pressure cover 2 to prevent it from falling off the air nozzle 12 under the impact of pressure. Further, the anti-detachment flange 13 can adopt a threaded structure, and an internal thread is machined on the guiding port 26. The pressure cover 2 can be screwed into and assembled on the air nozzle 12, and the anti-detachment flange 13 and the limiting baffle 25 can only be separated by a spiral fit method to avoid the pressure cover 2 falling off the air nozzle 12 under the impact force.

[0033] The electromagnetic assembly 3 includes a keel 32 and an iron core 33. The keel 32 is inserted into the valve body 1 and fixedly connected thereto. A coil 34 is wound around the outer periphery of the keel 32. A first through hole 35 is formed at the center of the keel 32. The iron core 33 is inserted into the first through hole 35 and fixedly connected thereto; a second through hole 36 is formed at the center of the iron core 33. An inner cylinder 37 is inserted into the second through hole 36 of the iron core 33. The inner cylinder 37 is arranged in contact with the inner wall of the second through hole 36 of the iron core 33, and the lower end of the inner cylinder 37 is connected to the lower end of the keel 32 through an extending structure so as to cover the lower end of the iron core 33. The keel 32 is formed on the iron core 33 by an injection molding process, so that the iron core 33 is inserted into the first through hole 35 between the keel 32 and the inner cylinder 37. In particular, the valve body 1 adopts a secondary molding process to integrally cover the electromagnetic assembly 3, so that the iron core 33 is integrally covered to improve its insulation performance and avoid the problem of the iron core 33 being corroded due to the entry of water vapor. Further, there is a structural partition of the inner cylinder 37, the iron core 33, and the keel 32 between the vent hole 31 and the coil 34, making the overall insulation performance better.

[0034] A shielding cover 4 is provided inside the valve body 1. The shielding cover 4 has an end surface partition portion and a circumferential partition portion and forms a shielding cavity with an opening facing upward. The keel 32, the iron core 33, the inner cylinder 37 and the coil 34 are all arranged in the shielding cavity of the shielding cover 4. A magnetic suction cup 38 is provided at the upper end of the iron core 33. The magnetic suction cup 38 is arranged in the upper port of the shielding cover 4 and the magnetic suction cup 38 is attached to the upper end surface of the keel 32. The shielding cover 4 is used to cut off the magnetism at the lower end of the iron core 33. When the coil 34 is energized, the iron core 33 generates magnetism, and then the magnetic suction cup 38 at the upper end of the iron core 33 generates corresponding magnetic poles and magnetic forces, which cooperate with the permanent magnet 21 to make the pressure cover 2 generate corresponding blocking pressure on the air nozzle 12.

[0035] A ventilation hole 31 is formed at the center of the inner cylinder 37. The end surface partition portion of the shielding cover 4 is attached to the lower end surface of the keel 32. A mating hole 41 is formed on the end surface partition portion of the shielding cover 4. A positioning convex ring 39 is provided on the lower end surface of the keel 32. The positioning convex ring 39 is arranged around the ventilation hole 31, and the positioning convex ring 39 passes through the mating hole 41 to form a hole-shaft fit therewith. The valve stem 11 passes through the ventilation hole 31, and the lower end of the valve stem 11 passes through the positioning convex ring 39 and is thus arranged below the valve body 1.

[0036] Preferably, the valve body 1 is integrally formed by a secondary injection molding process. The valve body 1 covers the lower end surface of the end surface partition portion of the shielding cover 4 and is thus fixedly connected to the lower end of the valve stem 11. The valve body 1 covers the outer edge surface of the circumferential partition portion of the shielding cover 4 and is thus fixedly connected to the shielding cover 4. The valve body 1 covers the upper end surfaces of the keel 32 and the magnetic suction cup 38 and is thus fixedly connected to the two. The valve body 1 covers the upper end of the valve stem 11 and is thus fixedly connected to it. The keel 32 has an I-shaped structure to form a winding slot for the coil 34. When the valve body 1 is injection molded, the injection molding material can be filled on the coil 34 between the keel 32 and the shielding cover 4, thereby further improving the insulation performance of the solenoid valve.

[0037] Embodiment 2

[0038] As Figure 5As shown in the figure, the pressure cover 2 further includes an exhaust hood 27. The lower port of the exhaust hood 27 is detachably connected to the upper end of the valve body 1, and a sealing gasket 28 is provided between the lower port of the exhaust hood 27 and the valve body 1. The pressure cover 2 is arranged in the exhaust hood 27 and is cooperatively connected with the air nozzle 12. An air outlet hole is provided at the upper end of the exhaust hood 27, and an impeller 29 is arranged in the air outlet hole. The impeller 29 is rotatably connected to the exhaust hood 27. A boss is provided on the outer edge of the upper end of the valve body 1 to form an interference fit with the lower port of the exhaust hood 27, and the sealing performance between the exhaust hood 27 and the valve body 1 is improved through the sealing gasket 28. The pressurized gas discharged from the air nozzle 12 will be released into the exhaust hood 27, and the gas will blow the impeller 29 to rotate when flowing through the air outlet. The rotation of the impeller 29 can change the direction of the airflow ejection, thereby avoiding the safety risk caused by the direct injection of high-pressure steam.

[0039] The above is only the preferred embodiment of the present invention. Therefore, all equivalent changes or modifications made according to the structures, features, and principles described in the scope of the present invention patent application are included in the scope of the present invention patent application.

Claims

1. A pressure solenoid valve, comprising a valve body (1), a valve stem (11) and a pressure cover (2), characterized in that: An electromagnetic component (3) is provided inside the valve body (1). An air vent hole (31) is provided inside the electromagnetic component (3). The air valve rod (11) passes through the air vent hole (31) and is cooperatively connected with the electromagnetic component (3). The air valve rod (11), the electromagnetic component (3), and the valve body (1) are integrally formed by a molding process. The upper end of the air valve rod (11) penetrates through the upper end face of the valve body (1), and an air nozzle (12) is provided at the upper end of the air valve rod (11). The pressure cover (2) is cooperatively connected with the air nozzle (12) and can move up and down along it. A permanent magnet (21) is provided inside the pressure cover (2). The electromagnetic component (3) includes a keel (32) and an iron core (33). The keel (32) passes through the valve body (1) and is fixedly connected to it. A coil (34) is wound around the outer periphery of the keel (32). A first through hole (35) is formed at the center of the keel (32). The iron core (33) passes through the first through hole (35) and is fixedly connected to it. A second through hole (36) is formed at the center of the iron core (33). An inner cylinder (37) passes through the second through hole (36) of the iron core (33). The inner cylinder (37) is arranged in contact with the inner wall of the second through hole (36) of the iron core (33). The lower end of the inner cylinder (37) is connected to the lower end of the keel (32) through an extending structure to wrap the lower end of the iron core (33).

2. The pressure solenoid valve according to claim 1, wherein: An exhaust hole (22) is provided on the pressure cover (2). The upper end of the air nozzle (12) is inserted into and passes through the lower port of the exhaust hole (22). A pressure relief plate (23) is provided at the upper port of the exhaust hole (22). A plug (24) is provided on the bottom surface of the pressure relief plate (23). The plug (24) is movably abutted against the upper port of the air nozzle (12). A plurality of pressure relief holes are formed in the pressure relief plate (23).

3. The pressure solenoid valve according to claim 2, characterized in that: A limiting baffle (25) is provided on the inner wall of the exhaust hole (22). A guiding port (26) is formed in the limiting baffle (25). The air nozzle (12) movably passes through the guiding port (26). An anti - detachment flange (13) is provided at the upper end of the air nozzle (12) above the limiting baffle (25).

4. The pressure solenoid valve according to claim 1, wherein: The pressure cover (2) further includes an exhaust hood (27). The lower port of the exhaust hood (27) is paired with the upper end of the valve body (1) to form a detachable connection. A sealing gasket (28) is provided between the lower port of the exhaust hood (27) and the valve body (1). The pressure cover (2) is arranged inside the exhaust hood (27) and is cooperatively connected with the air nozzle (12). An air outlet hole is provided at the upper end of the exhaust hood (27), and an impeller (29) is provided in the air outlet hole. The impeller (29) is rotatably connected to the exhaust hood (27).

5. The pressure solenoid valve according to claim 1, characterized in that: A shielding cover (4) is provided inside the valve body (1). The shielding cover (4) has an end - face partition part and a circumferential partition part and forms a shielding cavity with an opening upward. The keel (32), the iron core (33), the inner cylinder (37), and the coil (34) are all arranged inside the shielding cavity of the shielding cover (4). A magnetic suction cup (38) is provided at the upper end of the iron core (33). The magnetic suction cup (38) is arranged inside the upper port of the shielding cover (4) and is attached to the upper end face of the keel (32).

6. The pressure solenoid valve according to claim 5, characterized in that: A vent hole (31) is formed at the center of the inner cylinder body (37). The end face partition part of the shielding cover (4) is attached to the lower end face of the keel (32). A mating hole (41) is formed in the end face partition part of the shielding cover (4). A positioning convex ring (39) is provided on the lower end face of the keel (32). The positioning convex ring (39) is arranged around the vent hole (31), and the positioning convex ring (39) passes through the mating hole (41) to form a hole-shaft fit therewith. The valve stem (11) passes through the vent hole (31), and the lower end of the valve stem (11) passes through the positioning convex ring (39) and is arranged below the valve body (1).

7. The pressure solenoid valve according to any one of claims 1-6, characterized in that: The valve body (1) is an integrally formed structure. The valve body (1) covers the lower end face of the end face partition part of the shielding cover (4) and is fixedly connected to the lower end of the valve stem (11). The valve body (1) covers the outer edge face of the circumferential partition part of the shielding cover (4) and is fixedly connected to the shielding cover (4). The valve body (1) covers the upper end faces of the keel (32) and the magnetic suction cup (38) and is fixedly connected to the two. The valve body (1) covers the upper end of the valve stem (11) and is fixedly connected to it.

8. The pressure solenoid valve according to any one of claims 1-6, characterized in that: The pressure solenoid valve is applied to an electric pressure cooker (5).

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