Electromagnetic valve with reverse stop function

Abstract

The utility model relates to the technical field of electromagnetic valves, in particular to an electromagnetic valve with a reverse cut-off function, which realizes a forward opening and reverse closing circulation mode through a valve core and improves the convenience in use. An air inlet is formed in the lower portion of the outer side wall of the valve seat, an exhaust port is formed in the bottom end of the valve seat, and a cavity is formed in the valve seat. The electromagnetic valve further comprises a valve element, a valve deck assembly, a first sealing gasket, a movable iron core, a static iron core, a coil assembly, a fully-closed piston, a small valve needle, a large valve needle and a second sealing gasket, the valve element and the fully-closed piston are installed in the cavity, the valve deck assembly is installed at the top end of the valve seat, a cavity is formed between the valve element and the valve deck assembly, and the coil assembly is installed on the valve deck assembly. A movable iron core and a static iron core are arranged in the coil assembly, a groove is formed in the bottom end of the movable iron core, the second sealing gasket is arranged on the groove in the bottom end of the movable iron core, and the small valve needle and the large valve needle are installed on the valve element in a matched mode.

Description

Technical Field

[0001] This utility model relates to the technical field of solenoid valves, and in particular to a solenoid valve with a reverse shut-off function. Background Technology

[0002] In key areas such as industrial automation, energy transmission, water treatment, and medical equipment, solenoid valves serve as core actuators in fluid pipelines, undertaking tasks such as media on / off switching, flow regulation, and directional control. As industries upgrade towards higher safety, lower energy consumption, and higher integration, the limitations of traditional solenoid valves in reverse media protection and dynamic control performance are becoming increasingly apparent.

[0003] Common solenoid valves include a valve seat, piston, valve cover assembly, return spring, moving iron core, stationary iron core, coil assembly, etc. Air enters through a side hole on the valve seat and exits through a bottom hole. For example, patent CN216618710U discloses a combined solenoid valve, including a valve seat, a solenoid valve body at the top of the valve seat, a valve stem inside the solenoid valve body, a first connecting plate at the top of the valve seat, and a second connecting plate at the bottom of the solenoid valve body. Both the first and second connecting plates have threaded holes on one side. The valve seat has a first flow channel and a second flow channel inside, and flanges on both sides of the valve seat.

[0004] However, it was found during the use of this solenoid valve that it was not convenient to achieve reverse shut-off function, which reduced the ease of use. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a solenoid valve with reverse shut-off function that achieves a forward opening and reverse closing flow mode through the valve core, thereby improving the convenience of use.

[0006] This utility model discloses a solenoid valve with reverse shut-off function, comprising a valve seat, an air inlet on the lower part of the outer wall of the valve seat, an exhaust port at the bottom of the valve seat, and a chamber inside the valve seat; it also includes a valve core, a valve cover assembly, a first sealing gasket, a moving iron core, a stationary iron core, a coil assembly, a fully enclosed piston, a small valve needle, a large valve needle, and a second sealing gasket. The valve core and the fully enclosed piston are installed in the chamber, the valve cover assembly is installed on the top of the valve seat, forming a cavity between the valve core and the valve cover assembly, the coil assembly is installed on the valve cover assembly, and a moving iron core and a stationary iron core are provided inside the coil assembly. A groove is provided at the bottom of the moving iron core, and the second sealing gasket is disposed on the groove at the bottom of the moving iron core. The small valve needle and the large valve needle are respectively fitted onto the valve core; under normal conditions, the first sealing gasket seals the air outlet of the valve seat, and the second sealing gasket seals the upper port of the pressure relief hole at the top of the valve core. When it needs to be opened... When the coil assembly is energized, it generates a magnetic field, causing the moving iron core to move upward. The second sealing gasket separates from the upper port of the pressure relief hole. Air pressure and elasticity force the valve core to move upward, and the first sealing gasket separates from the air outlet. When not in use, the coil assembly is de-energized, the moving iron core moves downward, the second sealing gasket blocks the upper port of the pressure relief hole, and the moving iron core moves downward along with the valve core. The first sealing gasket blocks the air outlet, allowing air to enter through the valve seat's air outlet, while preventing air from exiting through the air inlet. Air enters from the bottom of the valve seat, and the large valve needle is pressed upward, blocking the original air outlet. The air enters the valve seat through the long straight hole of the valve core, pushing the small valve needle upward to allow flow. The air enters the cavity between the valve cover assembly and the valve core, where it is sealed. The difference in the upper and lower force areas ensures that the valve core is always in a closed state, achieving a forward-opening and reverse-closing flow mode through the valve core.

[0007] Preferably, it also includes a spring, which is disposed on the outer wall of the valve core and inside the valve seat; the spring provides an upward pushing force to the valve core, improving the convenience of the valve core moving upward to separate the first sealing gasket from the air outlet.

[0008] Preferably, the coil assembly consists of a coil frame, a coil winding, an injection-molded shell, and a coil yoke. The coil winding is covered by the coil frame, and the two are wrapped by the injection-molded shell. The coil yoke is then mounted on the outside of the injection-molded shell. This improves the convenience of processing and assembling the coil assembly and enhances the overall performance of the coil assembly.

[0009] Preferably, the stationary iron core is fixed to the injection-molded shell by a combination of screws, which improves the ease of installation of the stationary iron core.

[0010] Preferably, the valve cover assembly and the valve seat are connected by pressure welding; this improves the stability of the valve cover assembly installation and enhances the sealing performance of the valve seat.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: Under normal conditions, the first sealing gasket seals the air outlet of the valve seat, and the second sealing gasket seals the upper port of the pressure relief hole at the top of the valve core. When it needs to be opened, the coil assembly is energized to generate a magnetic field, causing the moving iron core to move upward, separating the second sealing gasket from the upper port of the pressure relief hole. Air pressure and elasticity force the valve core to move upward, separating the first sealing gasket from the air outlet. When it is not in use, the coil assembly is de-energized, the moving iron core moves downward, and the second sealing gasket blocks the upper port of the pressure relief hole. The moving iron core moves downwards along with the valve core. The first sealing gasket blocks the air outlet, allowing air to enter through the valve seat's outlet while preventing air from exiting through the inlet. Gas enters from the bottom of the valve seat, and the large valve needle is pressed upwards, blocking the original air outlet. Gas enters the valve seat through the long straight hole of the valve core, pushing the small valve needle upwards to allow flow. The gas enters the cavity between the valve cover assembly and the valve core, where it is sealed. The difference in the upper and lower force areas ensures that the valve core is always in a closed state, achieving a forward-opening and reverse-closing flow mode through the valve core. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a partial isometric structural diagram of the connection between the valve seat and valve cover assembly, etc.

[0014] Figure 3 This is a partial side view of the structure connecting the moving iron core and the stationary iron core, etc.

[0015] Figure 4 This is a partial isometric structural diagram of the connection between the valve seat and valve cover assembly.

[0016] The following are labels in the attached diagram: 1. Valve seat; 2. Valve core; 3. Valve cover assembly; 4. First sealing gasket; 5. Moving iron core; 6. Stationary iron core; 7. Coil assembly; 8. Fully closed piston; 9. Small valve needle; 10. Large valve needle; 11. Second sealing gasket; 12. Spring. Detailed Implementation

[0017] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0018] Example 1

[0019] like Figures 1 to 4As shown, this utility model discloses a solenoid valve with reverse shut-off function, including a valve seat 1, an air inlet provided on the lower part of the outer side wall of the valve seat 1, an exhaust port provided at the bottom end of the valve seat 1, and a chamber provided inside the valve seat 1; it also includes a valve core 2, a valve cover assembly 3, a first sealing gasket 4, a moving iron core 5, a stationary iron core 6, a coil assembly 7, a fully closed piston 8, a small valve needle 9, a large valve needle 10, and a second sealing gasket 11. The valve core 2 and the fully closed piston 8 are installed in the chamber, the valve cover assembly 3 is installed on the top of the valve seat 1, and a cavity is formed between the valve core 2 and the valve cover assembly 3. The coil assembly 7 is installed on the valve cover assembly 3, and the moving iron core 5 and the stationary iron core 6 are provided inside the coil assembly 7. A groove is provided at the bottom end of the moving iron core 5, and the second sealing gasket 11 is provided on the groove at the bottom end of the moving iron core 5. The small valve needle 9 and the large valve needle 10 are respectively fitted and installed on the valve core 2.

[0020] like Figure 4 As shown, it also includes a spring 12, which is disposed on the outer wall of the valve core 2 and inside the valve seat 1.

[0021] In this embodiment, under normal conditions, the first sealing gasket 4 seals the air outlet of the valve seat 1, and the second sealing gasket 11 seals the upper port of the pressure relief hole at the top of the valve core 2. When it needs to be opened, the coil assembly 7 is energized to generate a magnetic field, causing the moving iron core 5 to move upward. The second sealing gasket 11 separates from the upper port of the pressure relief hole, and the air pressure and elastic force force the valve core 2 to move upward, separating the first sealing gasket 4 from the air outlet. When it is not needed, the coil assembly 7 is de-energized, the moving iron core 5 moves downward, the second sealing gasket 11 seals the upper port of the pressure relief hole, and at the same time, the moving iron core 5... As the valve core 2 moves downwards, the first sealing gasket 4 blocks the air outlet, allowing air to enter through the air outlet of the valve seat 1, while preventing air from exiting through the inlet. The gas enters from the bottom of the valve seat 1, and the large valve needle 10 is pressed upwards to block the original air outlet. The gas enters the interior of the valve seat 1 through the long straight hole of the valve core 2, pushing the small valve needle 9 upwards to allow flow. The gas enters the cavity between the valve cover assembly 3 and the valve core 2, sealing the gas within the cavity. The difference in the upper and lower force areas ensures that the valve core 2 is always in a closed state, achieving a forward opening and reverse closing flow mode through the valve core 2.

[0022] Example 2

[0023] Based on Example 1, such as Figure 1 As shown, the present invention provides a solenoid valve with reverse shut-off function. The coil assembly 7 consists of a coil frame, a coil winding, an injection-molded shell, and a coil yoke. The coil frame is covered with a coil winding, and the two are wrapped by the injection-molded shell. The injection-molded shell is fitted with a coil yoke.

[0024] like Figure 3 As shown, the stationary iron core 6 is fixed to the injection molded shell by a combination of screws;

[0025] like Figure 3As shown, the valve cover assembly 3 and the valve seat 1 are connected by pressure welding;

[0026] In this embodiment, the spring 12 provides an upward pushing force to the valve core 2, which improves the convenience of the valve core 2 moving upward to separate the first sealing gasket 4 from the air outlet, improves the convenience of processing and assembling the coil assembly 7, and improves the overall effect of the coil assembly 7.

[0027] This utility model discloses a solenoid valve with a reverse shut-off function. During normal operation, the first sealing gasket 4 seals the air outlet of the valve seat 1, and the second sealing gasket 11 seals the upper port of the pressure relief hole at the top of the valve core 2. When opening is required, the coil assembly 7 is energized to generate a magnetic field, causing the moving iron core 5 to move upwards. The second sealing gasket 11 separates from the upper port of the pressure relief hole, and air pressure and elastic force force the valve core 2 to move upwards, separating the first sealing gasket 4 from the air outlet. When not in use, the coil assembly 7 is de-energized, the moving iron core 5 moves downwards, and the second sealing gasket 11... The sealing gasket blocks the upper port of the pressure relief hole, and at the same time, the moving iron core 5 moves downward with the valve core 2. The first sealing gasket 4 blocks the air outlet, and air enters through the air outlet of the valve seat 1, while air cannot exit through the air inlet. The gas enters from the bottom of the valve seat 1, and the large valve needle 10 is pressed upward to block the original air outlet. The gas enters the interior of the valve seat 1 through the long straight hole of the valve core 2. The gas pushes the small valve needle 9 upward to allow flow. The gas enters the cavity between the valve cover assembly 3 and the valve core 2, and the gas is sealed in the cavity. The valve core 2 is always in the closed state by the difference in the upper and lower force areas.

[0028] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A solenoid valve with reverse shut-off function, comprising a valve seat (1), an air inlet provided on the lower part of the outer side wall of the valve seat (1), an exhaust port provided at the bottom end of the valve seat (1), and a chamber provided inside the valve seat (1); characterized in that, It also includes a valve core (2), a valve cover assembly (3), a first sealing gasket (4), a moving iron core (5), a stationary iron core (6), a coil assembly (7), a fully closed piston (8), a small valve needle (9), a large valve needle (10), and a second sealing gasket (11). The valve core (2) and the fully closed piston (8) are installed in the chamber. The valve cover assembly (3) is installed on the top of the valve seat (1). A cavity is formed between the valve core (2) and the valve cover assembly (3). The coil assembly (7) is installed on the valve cover assembly (3). The moving iron core (5) and the stationary iron core (6) are provided in the coil assembly (7). A groove is provided at the bottom of the moving iron core (5). The second sealing gasket (11) is provided on the groove at the bottom of the moving iron core (5). The small valve needle (9) and the large valve needle (10) are respectively installed on the valve core (2).

2. The solenoid valve with reverse shut-off function as described in claim 1, characterized in that, It also includes a spring (12), which is disposed on the outer wall of the valve core (2) and inside the valve seat (1).

3. A solenoid valve with reverse shut-off function as described in claim 1, characterized in that, The coil assembly (7) consists of a coil frame, a coil winding, an injection-molded shell, and a coil yoke. The coil frame is covered with a coil winding, and the two are wrapped by the injection-molded shell. The injection-molded shell is fitted with a coil yoke.

4. A solenoid valve with reverse shut-off function as described in claim 3, characterized in that, The stationary iron core (6) is fixed to the injection molded shell by a combination of screws.

5. A solenoid valve with reverse shut-off function as described in claim 1, characterized in that, The valve cover assembly (3) and the valve seat (1) are connected by pressure welding.

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