Pilot operated electromagnetic valve with anti-washout structure

Abstract

The application provides a pilot type electromagnetic valve with an anti-scouring structure, which comprises a main valve body and a pilot valve body, a moving iron core and an electromagnetic coil are arranged in the pilot valve body, a first partition plate in the main valve body divides the main valve body into a first chamber and a second chamber, a first sealing gasket is arranged at the bottom of the moving iron core and located in the first chamber, the first partition plate is provided with a pilot gas guide hole which is connected with an external gas source and the first chamber, the first end of the pilot gas guide hole which is connected with the first chamber has a horn-shaped structure which is large at the top and small at the bottom, the inner wall of the horn-shaped structure has a plurality of arc-shaped steps, a main valve core is arranged in the second chamber, when the coil loses electricity, the sealing gasket blocks the pilot gas guide hole and drives the main valve core to the first working position to close the electromagnetic valve, when the coil obtains electricity, the pilot gas guide hole is opened, the working gas flowing into the first chamber through the pilot gas guide hole changes the scouring direction of the sealing gasket and reduces the scouring intensity through the arc-shaped steps, and the gas flowing from the first chamber into the second chamber drives the main valve core to move downward to the second working position to open the electromagnetic valve.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve technology, and in particular to a pilot-operated solenoid valve with an anti-erosion structure. Background Technology

[0002] Solenoid valves are automatic shut-off valves that rely on electromagnetic force to open and close. They are mainly used for the automated control of pneumatic control system pipelines and pneumatic devices. By remotely controlling the energization and de-energization of the solenoid valve coil, the moving iron core can be controlled to move up and down, thereby realizing the opening, closing, or reversal of the medium in the pipeline and ensuring the normal operation of downstream users.

[0003] Pilot-operated solenoid valves are suitable for controlling large-diameter, high-pressure pipelines. They offer advantages such as rapid operation, low power consumption, and compact design. The up-and-down movement of the moving iron core in a pilot-operated solenoid valve does not directly open or close the main pipeline; instead, it opens and closes the pilot vent. The pressure generated by the gas flowing into the pilot vent pushes down the main valve core, which is lifted by a spring, thus opening, closing, or reversing the flow of media in the main pipeline.

[0004] The bottom of the moving iron core is equipped with a sealing gasket. The repeated opening and closing of the pilot vent is actually a process of repeatedly lifting and pressing down the sealing gasket. During this process, the sealing gasket undergoes slight horizontal displacement, or impurities enter between the sealing gasket and the pilot vent, leading to wear and failure of the sealing surface of the gasket. These are important factors affecting the lifespan of the sealing gasket and even the lifespan of the solenoid valve.

[0005] Therefore, how to provide a pilot-operated solenoid valve with an anti-erosion structure to reduce the erosion force of the gas flowing out of the pilot vent on the sealing gasket below the moving iron core, so as to improve the service life of the sealing gasket and thus improve the service life of the pilot-operated solenoid valve, is an urgent problem to be solved in the industry. Summary of the Invention

[0006] The purpose of this invention is to provide a pilot-operated solenoid valve with an anti-erosion structure, which can effectively increase the service life of the sealing gasket on the lower surface of the moving iron core assembly.

[0007] To achieve the above objectives, the present invention provides a pilot-operated solenoid valve with an anti-erosion structure, comprising: a main valve body and a pilot valve body disposed above the main valve body;

[0008] The pilot valve body is provided with a moving iron core and an electromagnetic coil surrounding the moving iron core.

[0009] The main valve body is divided into a first chamber and a second chamber by a first partition plate inside the main valve body. The first chamber is located above the second chamber. The bottom of the moving iron core is located in the first chamber, and a first sealing gasket is fixedly provided on the bottom surface of the moving iron core. The main valve core is located in the second chamber.

[0010] The top surface of the first partition has a pilot vent hole connecting the first chamber and an external gas source; the first partition also has a connecting hole connecting the first and second chambers; the first end of the pilot vent hole that connects to the first chamber has a trumpet-shaped structure that is larger at the top and smaller at the bottom; along the axial direction of the pilot vent hole, the inner wall of the trumpet-shaped structure has multiple arc-shaped steps; the anti-erosion structure formed by the multiple arc-shaped steps changes the erosion direction of the gas flowing into the first chamber from the pilot vent hole on the first sealing gasket and reduces the erosion force;

[0011] When the electromagnetic coil is de-energized, the moving iron core drives the first sealing gasket to move downward and seals the pilot air hole and the connecting hole. By inputting gas into the second chamber, the main valve core is driven upward to the first working position, and the electromagnetic valve is closed.

[0012] When the electromagnetic coil is energized, the moving iron core drives the first sealing gasket to move upward, the pilot vent opens, and the gas from the external gas source flows into the second chamber through the pilot vent, the first chamber, and the connecting hole in sequence, driving the main valve core to move downward to the second position, and the solenoid valve is in the open state.

[0013] Optionally, the curved surfaces of the plurality of curved steps have the same curvature.

[0014] Optionally, adjacent curved steps can be smoothly transitioned.

[0015] Optionally, the number of curved steps is two.

[0016] Optionally, from top to bottom, the second chamber is provided with a second partition and a third partition; from top to bottom, the second chamber is divided into an exhaust chamber, a working chamber, and an intake chamber by the second and third partitions; the main valve core includes a top plate, a bottom plate, and a connecting rod connected between the top plate and the bottom plate; the top plate is located in the exhaust chamber, and the bottom plate is located in the intake chamber.

[0017] Optionally, the diameter of the top plate is larger than the diameter of the bottom plate.

[0018] Optionally, the pilot valve body is also provided with an air inlet; the pilot valve body is also provided with a first air inlet pipe and a second air inlet pipe; gas from an external gas source flows into the air inlet chamber sequentially through the air inlet and the first air inlet pipe; the second air inlet pipe connects the first air inlet pipe and the pilot air inlet.

[0019] Optionally, the pilot valve body is also provided with an exhaust port and at least one working port; the exhaust port connects the exhaust chamber and the external space, and the working port connects the working chamber and the external pneumatic device.

[0020] Optionally, when the main valve core is in the first position, the bottom plate prevents the air passage of the working chamber from connecting to the air inlet chamber, and the top plate avoids the exhaust port; when the main valve core is in the second position, the working chamber is connected to the air inlet chamber, and the top plate prevents the air passage of the exhaust chamber from connecting to the working chamber.

[0021] Optionally, the pilot-operated solenoid valve with an anti-erosion structure further includes a valve cover, which is fixedly connected between the pilot valve body and the main valve body.

[0022] Compared with the prior art, the beneficial effects of the pilot-operated solenoid valve with anti-erosion structure of the present invention are as follows:

[0023] The pilot vent of this invention, connected to the first chamber, has a flared structure that is wider at the top and narrower at the bottom. Along the axial direction of the pilot vent, the inner wall of the flared structure has multiple arc-shaped steps. These arc-shaped steps alter the direction of the gas flowing into the first chamber from the pilot vent and reduce the scouring force on the first gasket, preventing impurities in the gas from wearing down the sealing surface of the first gasket. This significantly improves the service life of the first gasket and saves production costs. By reducing the frequency of first gasket replacements, the solenoid valve of this invention greatly improves its working efficiency. This invention has significant practical value and economic benefits. Attached Figure Description

[0024] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description will be briefly introduced below. Obviously, the drawings in the following description are one embodiment of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0025] Figure 1 This is a schematic diagram of the internal structure of the pilot solenoid valve with an anti-erosion structure according to the present invention.

[0026] Figure 2 This is a schematic diagram of the external structure of the pilot solenoid valve with an anti-erosion structure according to the present invention.

[0027] Figure 3 This is a schematic diagram of the moving iron core assembly of the present invention;

[0028] Figure 4 This is a schematic diagram showing the solenoid valve in the closed state in this invention;

[0029] Figure 5 This is a schematic diagram showing the solenoid valve in the open state in this invention;

[0030] Figure 6 for Figure 1 Enlarged view of the area circled in dashed text;

[0031] Figure 7This is a schematic diagram of the anti-erosion structure in an embodiment of the present invention;

[0032] In the picture:

[0033] 100. Main valve body; 110. Moving iron core assembly; 111. Moving iron core; 112. First sealing gasket; 120. Electromagnetic coil;

[0034] 200. Pilot valve body; 201. Pilot vent; 202. Anti-erosion structure; 203. Arc-shaped step; 204. Connecting hole;

[0035] 210. First chamber;

[0036] 211. First partition; 212. Second partition; 213. Third partition;

[0037] 220, Second chamber; 220a, Exhaust chamber; 220b, Working chamber; 220c, Intake chamber;

[0038] 231. Top plate; 232. Bottom plate; 233. Connecting rod;

[0039] 241. First intake pipe; 242. Second intake pipe.

[0040] 300. Valve cover. Detailed Implementation

[0041] 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0043] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0044] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0045] As used in this specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrases "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0046] Furthermore, in the description of this application, the terms "first," "second," "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0047] This invention provides a pilot-operated solenoid valve with an anti-erosion structure 202, such as... Figure 1 , Figure 2 As shown, it includes: a main valve body 100, a pilot valve body 200, and a valve cover 300. The pilot valve body 200 is located above the main valve body 100, and the valve cover 300 is fixedly connected between the pilot valve body 200 and the main valve body 100.

[0048] The pilot valve body 200 contains a moving iron core assembly 110 and an electromagnetic coil 120 surrounding the moving iron core assembly 110. For example... Figure 3 As shown, the moving iron core assembly 110 includes a moving iron core 111, and a first sealing gasket 112 is fixedly provided on the bottom surface of the moving iron core 111.

[0049] like Figure 4 , Figure 5 As shown, the main valve body 100 is divided into a first chamber 210 and a second chamber 220 by a first partition 211 inside the main valve body 100, which are arranged vertically. The first chamber 210 is located above the second chamber 220. The bottom of the moving iron core 111 is located inside the first chamber 210.

[0050] like Figure 1 As shown, the top surface of the first partition 211 has a pilot air vent 201 that connects an external gas source and the first chamber 210. Figure 4 , Figure 5 As shown, the first partition 211 also has a connecting hole 204 connecting the first chamber 210 and the second chamber 220. Figure 6 , Figure 7As shown, the first end of the pilot air vent 201, which communicates with the first chamber 210, has a trumpet-shaped structure that is wider at the top and narrower at the bottom. Along the axial direction of the pilot air vent 201, the inner wall of the trumpet-shaped structure has an anti-erosion structure 202. The anti-erosion structure 202 includes multiple arc-shaped steps 203, with smooth transitions between adjacent arc-shaped steps 203. In a preferred embodiment, the arc surfaces of the multiple arc-shaped steps 203 have the same curvature. In this embodiment, the number of arc-shaped steps 203 is two. Figure 4 , Figure 5 Primarily to explain the working principle of the solenoid valve, the pilot air port 201 is... Figure 4 , Figure 5 The connecting hole 204 in the middle is blocked, therefore Figure 4 , Figure 5 The pilot vent 201 is not shown in the image.

[0051] like Figure 4 , Figure 5 As shown, from top to bottom, the second chamber 220 is equipped with a second partition 212 and a third partition 213, which divide the interior of the second chamber 220 into an exhaust chamber 220a, a working chamber 220b, and an intake chamber 220c. The second chamber 220 contains a main valve core, which includes a top plate 231, a bottom plate 232, and a connecting rod 233 connecting the top plate 231 and the bottom plate 232. The top plate 231 is located in the exhaust chamber 220a, and the bottom plate 232 is located in the intake chamber 220c. The diameter of the top plate 231 is larger than the diameter of the bottom plate 232.

[0052] like Figure 4 , Figure 5 As shown, the pilot valve body 200 is also provided with an air inlet, an air outlet, and at least one working port (such as...). Figure 2 As shown, this embodiment includes a working port A and a working port B. The pilot valve body 200 also includes a first air inlet pipe 241 and a second air inlet pipe 242. Gas from an external gas source flows into the intake chamber 220c sequentially through the air inlet and the first air inlet pipe 241. The second air inlet pipe 242 connects the first chamber 210 and the first air inlet pipe 241, allowing gas from an external gas source to flow into the first chamber 210 sequentially through the air inlet, the first air inlet pipe 241, and the second air inlet pipe 242.

[0053] like Figure 4 , Figure 5 The exhaust port shown connects the exhaust chamber 220a to the external space, and the working port connects the working chamber 220b to the corresponding external pneumatic device.

[0054] like Figure 4As shown, when the electromagnetic coil 120 is de-energized, the moving iron core 111 falls naturally, and the first sealing gasket 112 blocks the pilot air vent 201 (the pilot air vent 201 is closed) and the connecting hole 204. Gas is input into the air inlet chamber 220c through the air inlet, thereby driving the main valve core upward to the first position. At this time, the bottom plate 232 is attached to the bottom surface of the third partition 213, the working chamber 220b is not connected to the air inlet chamber 220c through the air passage, the top plate 231 avoids the exhaust port, and the exhaust port is connected to the working chamber 220b. The gas in the working port is discharged from the exhaust port to the outside of the solenoid valve, and the solenoid valve is in the closed state.

[0055] like Figure 5 As shown, when the electromagnetic coil 120 is energized, the moving iron core 111 drives the first sealing gasket 112 to move upward, opening the pilot vent 201. The anti-erosion structure 202 formed by the multiple arc-shaped steps 203 changes the direction of the working gas flowing into the first chamber 210 from the pilot vent 201 and reduces the erosion force on the first sealing gasket 112. This prevents impurities in the gas from wearing down the sealing surface of the first sealing gasket 112, greatly improving its service life and saving production costs. By reducing the frequency of replacement of the first sealing gasket 112, the electromagnetic valve of this invention significantly improves its working efficiency. This invention has excellent practical value and economic benefits.

[0056] Gas flows from the first chamber 210 into the second chamber 220 through the connecting hole 204. Since the area of ​​the top plate 231 is larger than that of the bottom plate 232, the upper surface of the top plate 231 experiences greater pressure relative to the lower surface of the bottom plate 232. This pressure difference between the top plate 231 and the bottom plate 232 drives the main valve core downwards to the second position. When the main valve core is in the second position, the working chamber 220b connects to the inlet chamber 220c, and the bottom surface of the top plate 231 abuts against the top surface of the second partition 212, preventing the exhaust chamber 220a from connecting to the working chamber 220b. The solenoid valve is in the open state. Gas flows sequentially from the inlet port into the inlet chamber 220c and the working chamber 220b, and then into the corresponding pneumatic device through the working port.

[0057] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0058] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A pilot operated electromagnetic valve having a scolping structure, characterized by, The valve comprises a main valve body and a pilot valve body arranged above the main valve body; The pilot valve body is internally provided with a moving iron core and an electromagnetic coil surrounding the moving iron core; The interior of the main valve body is divided into a first chamber and a second chamber arranged in a top-bottom manner by a first partition plate in the main valve body; the first chamber is located above the second chamber; the bottom of the moving iron core is located in the first chamber, and the bottom surface of the moving iron core is fixedly provided with a first sealing gasket; the second chamber is internally provided with a main valve core; The top surface of the first partition plate is provided with a pilot gas guide hole communicating the first chamber and an external gas source; the first partition plate is further provided with a communication hole communicating the first chamber and the second chamber; the first end of the pilot gas guide hole communicating the first chamber has a horn-shaped structure with a large upper part and a small lower part; the inner wall of the horn-shaped structure has a plurality of arc-shaped steps in the axial direction of the pilot gas guide hole; the anti-scouring structure formed by the plurality of arc-shaped steps changes the scouring direction of the gas flowing into the first chamber through the pilot gas guide hole to the first sealing gasket and reduces the scouring intensity; When the electromagnetic coil loses power, the moving iron core drives the first sealing gasket to move downward and block the pilot gas guide hole and the communication hole, and the main valve core is driven upward to the first working position by inputting gas into the second chamber, and the electromagnetic valve is closed; When the electromagnetic coil is powered on, the moving iron core drives the first sealing gasket to move upward, the pilot gas guide hole is opened, and the gas of the external gas source flows into the second chamber through the pilot gas guide hole, the first chamber and the communication hole in sequence, and drives the main valve core to move downward to the second working position, and the electromagnetic valve is in an open state; From top to bottom, the second chamber is internally provided with a second partition plate and a third partition plate; from top to bottom, the second chamber is divided into an exhaust chamber, a working chamber and an intake chamber by the second partition plate and the third partition plate; the main valve core comprises a top plate, a bottom plate and a connecting rod arranged between the top plate and the bottom plate; the top plate is located in the exhaust chamber, and the bottom plate is located in the intake chamber; The diameter of the top plate is greater than the diameter of the bottom plate; The pilot valve body is further provided with an air inlet; the pilot valve body is further internally provided with a first air inlet pipeline and a second air inlet pipeline; the gas of the external gas source flows into the intake chamber through the air inlet and the first air inlet pipeline in sequence; the first air inlet pipeline and the pilot gas guide hole are communicated through the second air inlet pipeline.

2. The pilot operated spool valve type electromagnetic valve having a scoured prevention structure according to claim 1, characterized in that, The arc-shaped surfaces of the plurality of arc-shaped steps have the same curvature.

3. The pilot operated spool valve type electromagnetic valve having a scoured prevention structure according to claim 1, characterized in that, The adjacent arc-shaped steps are smoothly connected.

4. The pilot operated spool valve type electromagnetic valve having a scoured prevention structure according to claim 1, wherein The number of arc-shaped steps is two.

5. The pilot operated spool valve type electromagnetic valve having a scoured prevention structure according to claim 1, wherein The pilot valve body is further provided with an air outlet and at least one working port; the air outlet communicates the exhaust chamber and an external space, and the working port communicates the working chamber and an external pneumatic device.

6. The pilot operated spool valve type electromagnetic valve having a scoured prevention structure according to claim 1, wherein When the main valve core is located at the first working position, the working chamber is prevented from communicating with the intake chamber by the bottom plate, and the top plate avoids the air outlet; when the main valve core is located at the second working position, the working chamber communicates with the intake chamber, and the exhaust chamber is prevented from communicating with the working chamber by the top plate.

7. The pilot operated spool valve type electromagnetic valve having a scoured prevention structure according to claim 1, wherein The valve further comprises a valve cover fixedly and connectively arranged between the pilot valve body and the main valve body.

Images