Pilot operated solenoid valve

Abstract

The application discloses a pilot electromagnetic valve, which comprises a pilot valve and a stop type main valve. The pilot valve comprises a shell, a pilot chamber arranged in the shell, a pilot assembly arranged in the pilot chamber and a pilot valve port arranged at one end of the shell and connected with the pilot assembly. The stop type main valve comprises a valve body, a main valve chamber connected with the pilot valve port and a main valve assembly arranged in the main valve chamber. The main valve assembly comprises a main valve core arranged in the main valve chamber and a reset spring connected with the main valve core. The pilot electromagnetic valve adopts a bidirectional guiding structure and is additionally provided with the reset spring, thereby avoiding the problems of easy jamming and gas leakage of the traditional pilot electromagnetic valve and improving the working performance of the traditional pilot electromagnetic valve.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluid control, in particular to a pilot electromagnetic valve. BACKGROUND

[0002] The traditional main valve core single-side guide structure and the main valve core without reset spring make the traditional pilot electromagnetic valve prone to jamming and gas leakage. Although such problems do not occur every time, they are still obvious failure modes, and the consequences of failure will directly lead to the failure of the pneumatic control equipment to work normally. This greatly affects the effective function of the pilot electromagnetic valve as an important pneumatic control device. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a pilot electromagnetic valve.

[0004] The technical scheme adopted by the present application to solve the technical problem is: a pilot electromagnetic valve is constructed, which comprises a pilot valve and a shut-off type main valve;

[0005] The pilot valve comprises a shell, a pilot chamber arranged in the shell, a pilot assembly arranged in the pilot chamber, and a pilot valve port arranged at one end of the shell and connected with the pilot assembly;

[0006] The shut-off type main valve comprises a valve body, a main valve chamber connected with the pilot valve port at one end, and a main valve assembly arranged in the main valve chamber;

[0007] The main valve assembly comprises a main valve core arranged in the main valve chamber and a reset spring connected with the main valve core.

[0008] In some embodiments, the pilot electromagnetic valve further comprises an air inlet port in communication with the main valve chamber and arranged vertically with the main valve core, a working port in communication with the main valve chamber and arranged vertically with the main valve core, and an exhaust port arranged at an end of the main valve chamber away from the pilot valve port;

[0009] The working port is arranged on the side of the air inlet port away from the pilot valve port;

[0010] The exhaust port is arranged coaxially with the main valve core.

[0011] In some embodiments, the main valve assembly further comprises a first guide valve port and a second guide valve port arranged at both sides of the working port;

[0012] The first guide valve port and the second guide valve port are used together to position and guide the axial movement of the main valve core;

[0013] The reset spring is connected with the first guide valve port;

[0014] The first O-ring is arranged on the outer periphery of the first guide valve port.

[0015] In some embodiments, the main valve core comprises a base body arranged at one end of the main valve core close to the pilot valve port, a valve rod arranged on the base body, and a guide arranged on the outer periphery of the valve rod.

[0016] The base body is sleeved with a main valve core sealing ring.

[0017] The end of the guide towards the exhaust port is provided with a lock nut.

[0018] The guide is provided with a protruding portion and first and second guide portions arranged at both ends of the protruding portion.

[0019] One end of the protruding portion is used to abut against one end of the first guide valve port towards the second guide valve port, and the other end of the protruding portion is used to abut against one end of the second guide valve port towards the first guide valve port.

[0020] In some embodiments, the valve body comprises a main valve body provided with the main valve chamber, and front and rear valve bodies arranged at both ends of the main valve body; the exhaust port is arranged in the rear valve body.

[0021] A second O-ring is arranged between the main valve body and the rear valve body.

[0022] In some embodiments, the valve body assembly comprises a moving iron core abutting against the pilot valve port at one end, and a stationary iron core abutting against one end of the moving iron core.

[0023] The central axes of the pilot valve port, the moving iron core, and the stationary iron core are on the same straight line.

[0024] In some embodiments, the moving iron core is provided with a hollow portion, and the hollow portion is provided with a first sealing gasket and a second sealing gasket at both ends thereof.

[0025] The first sealing gasket and the second sealing gasket are connected by a supporting spring.

[0026] The end of the stationary iron core away from the moving iron core is sleeved with a fixing nut.

[0027] In some embodiments, the valve body assembly further comprises a pilot reset spring connected to the moving iron core at one end, used to drive the moving iron core to move to close the pilot valve port when the electromagnetic force of the moving iron core disappears.

[0028] In some embodiments, the pilot type electromagnetic valve further comprises a manual switch.

[0029] The manual switch comprises a screwing part, a connecting part arranged at the lower end of the screwing part, and a driving part arranged at the lower end of the connecting part.

[0030] The driving part is in a semi-cylindrical shape, which is used to abut against the moving iron core, so that rotating the screwing part drives the driving part to move, so that the moving iron core can move along the axial direction thereof.

[0031] In some embodiments, an electromagnetic valve coil for driving the pilot electromagnetic valve to work is further arranged in the shell.

[0032] The present application has the following beneficial effects: the pilot electromagnetic valve comprises a pilot valve and a shut-off main valve, the pilot valve comprises a shell, a pilot chamber arranged in the shell, a pilot assembly arranged in the pilot chamber, and a pilot valve port arranged at one end of the shell and connected with the pilot assembly, the shut-off main valve comprises a valve body, a main valve chamber connected with the pilot valve port at one end, and a main valve assembly arranged in the main valve chamber, the main valve assembly comprises a main valve core arranged in the main valve chamber and movably connected with the main valve chamber, and a reset spring sleeved on the outer periphery of the main valve core. The pilot electromagnetic valve adopts a bidirectional guiding structure, and is additionally provided with a reset spring, which avoids the problems of jamming and gas leakage of the traditional pilot electromagnetic valve, and improves the working performance of the traditional pilot electromagnetic valve. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the present application, the present application will be further described below in conjunction with the drawings and embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor. In the drawings:

[0034] Fig. 1 is a perspective structural schematic view of the pilot electromagnetic valve in some embodiments of the present application;

[0035] Fig. 2 is a structural schematic view of the pilot valve in some embodiments of the present application. DETAILED DESCRIPTION

[0036] In order to make the technical features, objectives and effects of the present application clearer, the specific embodiments of the present application will be described in detail below. In the following description, it should be understood that the directions or positional relationships indicated by "front", "back", "upper", "lower", "left", "right", "vertical", "horizontal", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail" and the like are based on the directions or positional relationships shown in the drawings, constructed and operated in a particular direction, and are only for the convenience of describing the technical solutions, and should not be construed as indicating that the devices or elements referred to must have a particular direction, and therefore should not be construed as limiting the present application.

[0037] It should also be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing", "setting" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship between two elements. When an element is referred to as "on" or "under" another element, the element can be "directly" or "indirectly" located on the other element, or one or more intervening elements can be present. The terms "first", "second", "third" and the like are only for the convenience of describing the technical solutions, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features with "first", "second", "third" and the like can be explicitly or implicitly included one or more of the features. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] Please refer to Figs. 1-2 A pilot type electromagnetic valve in some embodiments of the present application, comprising a pilot valve 1 and a shut-off type main valve 2, the pilot valve 1 comprising a housing 11, a pilot chamber 12 provided in the housing 11, a pilot assembly 13 provided in the pilot chamber 12, and a pilot valve port 14 provided at one end of the housing 11 and connected with the pilot assembly 13, the shut-off type main valve 2 comprising a valve body 21, a main valve chamber 22 connected with the pilot valve port 14 at one end, and a main valve assembly 23 provided in the main valve chamber 22, the main valve assembly 23 comprising a main valve core 231 provided in the main valve chamber 22 and a return spring 232 connected with the main valve core 231.

[0039] In some embodiments, the housing 11 and the valve body 21 can be metal parts, which can be made of 45 steel. The 45 steel has high strength and rigidity, high surface hardness, good processability and impact resistance. In other embodiments, the housing 11 and the valve body 21 can also be made of Q235, 20CR or other metal materials.

[0040] Specifically, the pilot electromagnetic valve further comprises an inlet port 221 communicating with the main valve chamber 22 and vertically arranged with the main valve core 231, a working port 222 communicating with the main valve chamber 22 and vertically arranged with the main valve core 231, and an exhaust port 223 arranged at the end of the main valve chamber 22 away from the pilot valve port 14, the working port 222 being arranged on the side of the inlet port 221 away from the pilot valve port 14, and the exhaust port 223 being coaxially arranged with the main valve core 231. Understandably, when the main valve core 231 is not provided with air pressure by the pilot valve 1, and the inlet port 221 is not provided with air pressure, at this time the reset spring 232 can be used to reset the main valve core 231 so that the main valve port connected with the pilot valve port 14 is closed to prevent air leakage from the communication between the inlet port 221 and the pilot valve port 14. If the reset spring 232 is not provided, the main valve core 231 will be in an arbitrary position, and if the air pressure of the inlet port 221 is restored, the main valve core 231 may have a large amount of air leakage.

[0041] The main valve assembly 23 further comprises a first guide valve port 233 and a second guide valve port 234 arranged on both sides of the working port 222, which are used for positioning and guiding the axial movement of the main valve core 231, the reset spring 232 is connected with the first guide valve port 233, and the first guide valve port 233 and the second guide valve port 234 are both provided with a first O-ring 235, which is used for sealing the first guide valve port 233 and the second guide valve port 234 to ensure the sealing performance of the main valve chamber 22 and prevent air pressure leakage between the working port 222 and the inlet port 221 or the exhaust port 223 when the main valve core 231 moves.

[0042] Further, the main valve core 231 comprises a base body portion 2311 arranged at the end of the main valve core 231 close to the pilot valve port 14, a valve rod 2312 arranged on the base body portion 2311, and a guide member 2313 sleeved on the outer periphery of the valve rod 2312, which can be connected with the valve rod 2312 by threading, welding or integrally formed with the valve rod 2312. Specifically, the base body portion 2311 is sleeved with a main valve core sealing ring 2314 to ensure that air pressure does not leak from the main valve port, and the end of the guide member 2313 towards the exhaust port 223 is provided with a locking nut 2315 for fixing the guide member 2313. The guide member 2313 is provided with a protruding portion 23131 and a first guide portion 23132 and a second guide portion 23133 arranged at both ends of the protruding portion 23131, one end of the protruding portion 23131 is used for abutting against the end of the first guide valve port 233 towards the second guide valve port 234, and the other end of the protruding portion 23131 is used for abutting against the end of the second guide valve port 234 towards the first guide valve port 233.

[0043] Understandably, when the main valve core 231 moves, the main valve core 231 ensures that it can be guided on both sides, the inner diameters of the first guide valve port 233 and the second guide valve port 234 can be consistent with the outer diameters of the first guide portion 23132 and the second guide portion 23133, the arrangement of the guide 2313 makes the first guide portion 23132 enter the second guide valve port 234 before it leaves the first guide valve port 233, and similarly, the first guide portion 23132 has entered the first guide valve port 233 before the second guide portion 23133 leaves the second guide valve port 234, thereby forming a double-sided guide, improving the stability and smoothness of the movement of the main valve core 231, and effectively avoiding the problem of jamming when the main valve core 231 moves. Among them, the first guide valve port 233, the main valve core 231 and the second guide valve port 234 are end face sealed, which can further improve the smoothness of the movement of the main valve core 231 and has the advantage of anti-jamming.

[0044] In some embodiments, the valve body 21 includes a main valve body 211 and front and rear valve bodies 212 and 213 arranged at both ends of the main valve body 211, and the rear valve body 213 is provided with an exhaust port 223. The front valve body 212 and the rear valve body 213 can be connected with the main valve body 211 by fasteners or by buckling. Further, a second O-ring 214 is arranged between the main valve body 211 and the rear valve body 213 to further enhance the sealing performance of the main valve chamber 22.

[0045] The pilot assembly 13 includes a moving iron core 131 abutting the pilot valve port 14 and a stationary iron core 132 spaced apart from the moving iron core 131. The center axes of the pilot valve port 14, the moving iron core 131 and the stationary iron core 132 are on the same straight line. Preferably, the stationary iron core 132 is provided with a gas outlet for discharging high-pressure gas from the pilot valve 1. The moving iron core 131 is hollow inside to form a hollow portion 1311. The first and second sealing pads 133 and 134 are arranged at both ends of the hollow portion 1311, respectively. The first and second sealing pads 133 and 134 are connected by a support spring 135. The first sealing pad 133 is arranged on the side close to the stationary iron core 132 and can abut the stationary iron core 132. The second sealing pad 134 is arranged at the end of the moving iron core 131 facing the pilot valve port 14 and can seal the pilot valve port 14. Further, the support spring 135 ensures a certain elasticity between the first and second sealing pads 133 and 134, ensuring the reliability of the sealing. The stationary iron core 132 is provided with a fixed nut 136 at the end away from the moving iron core 131 for fixing the stationary iron core 132.

[0046] Further, the pilot assembly 13 further comprises a pilot reset spring 137 connected to the moving iron core 131, which is used to drive the moving iron core 131 to move to close the pilot valve port 14 when the electromagnetic force disappears. Wherein, the housing 11 of the pilot valve is further provided with an electromagnetic valve coil for driving the pilot electromagnetic valve to work, which is connected with an external power mechanism for providing power for the pilot electromagnetic valve.

[0047] Preferably, the pilot electromagnetic valve further comprises a manual switch 3, which comprises a rotating part 31, a connecting part 32 arranged at the lower end of the rotating part 31, and a driving part 33 arranged at the lower end of the connecting part 32, the driving part 33 is in the shape of a semi-cylinder, which is used to abut against the moving iron core 131, so that rotating the rotating part 31 drives the driving part 33 to move, so that the moving iron core 131 can move along its axial direction.

[0048] Understandably, the working principle of the pilot electromagnetic valve is as follows:

[0049] 1. When the electromagnetic valve coil loses power, the moving iron core 131 abuts against the pilot valve port 14 under the driving action of the pilot reset spring 137, so that the second sealing gasket 134 seals with the pilot valve port 14, at the same time, the space formed by the base body part 2311 and the pilot valve port 14 in the main cavity communicates with the atmosphere, the main valve core 231 is driven by the reset spring 232 and the air flow pressure through the inlet port 221 to make the main valve core 231 located at the leftmost end of the main cavity, the first guide valve port 233 is closed, the inlet port 221 is disconnected with the working port 222, and the working port 222 is connected with the exhaust port 223;

[0050] 2. When the electromagnetic valve coil is powered on, the moving iron core 131 is driven to move left by electromagnetic force, so that the first sealing gasket 133 seals with the gas outlet arranged in the static iron core 132, at this time, the second sealing gasket 134 does not abut against the pilot valve port 14, so that the pilot valve port 14 is opened, high-pressure gas can enter the main cavity through the pilot valve port 14 to drive the main valve core 231 to move right, at the same time, the first guide valve port 233 is opened, the second guide valve port 234 is in a relationship, the inlet port 221 is connected with the working port 222, and the working port 222 is disconnected with the exhaust port 223, so as to realize the opening and closing of the pilot electromagnetic valve;

[0051] 3. When the electromagnetic valve coil is not working, the pilot electromagnetic valve can be driven to open by the manual switch 3, the manual switch 3 is rotated by 180°, the moving iron core 131 is driven to move left or right by the driving part 33 to replace the role of the electromagnetic valve coil, the principle of the manual switch 3 controlling the opening and closing of the pilot electromagnetic valve is consistent with the principle of the electromagnetic valve coil controlling the opening and closing of the pilot electromagnetic valve.

[0052] It can be understood that the above embodiments only express the preferred embodiments of the present application, which are described more specifically and in detail, but cannot be understood as a limitation to the patent scope of the present application; it should be pointed out that the above technical features can be freely combined without departing from the concept of the present application for those skilled in the art, and several modifications and improvements can be made, which all belong to the protection scope of the present application; therefore, any equivalent transformation and modification made to the patent claim scope of the present application shall belong to the coverage of the patent claim of the present application.

Claims

1. A pilot-operated solenoid valve, characterized in that, Includes a pilot valve (1) and a shut-off main valve (2); The pilot valve (1) includes a housing (11), a pilot chamber (12) disposed in the housing (11), a pilot assembly (13) disposed in the pilot chamber (12), and a pilot valve port (14) disposed at one end of the housing (11 and connected to the pilot assembly (13). The shut-off main valve (2) includes a valve body (21), a main valve chamber (22) connected at one end to the pilot valve port (14), and a main valve assembly (23) disposed in the main valve chamber (22). The main valve assembly (23) includes a main valve core (231) disposed in the main valve chamber (22) and a return spring (232) connected to the main valve core (231). The pilot-operated solenoid valve also includes an air inlet (221) that is connected to the main valve chamber (22) and is perpendicular to the main valve core (231), a working port (222) that is connected to the main valve chamber (22) and is perpendicular to the main valve core (231), and an exhaust port (223) located at the end of the main valve chamber (22) away from the pilot valve port (14). The working port (222) is located on the side of the air inlet (221) away from the pilot valve port (14); The exhaust port (223) is coaxially arranged with the main valve core (231); The main valve assembly (23) further includes a first guide valve port (233) and a second guide valve port (234) located on both sides of the working port (222). The first guide valve port (233) and the second guide valve port (234) are used together to position and guide the axial movement of the main valve core (231). The main valve core (231) includes a base portion (2311) disposed at one end of the main valve core (231) near the pilot valve port (14), a valve stem (2312) disposed on the base portion (2311), and a guide member (2313) sleeved on the outer periphery of the valve stem (2312). The guide member (2313) is provided with a protrusion (23131) and a first guide portion (23132) and a second guide portion (23133) at both ends of the protrusion (23131). One end of the protrusion (23131) is used to abut against the end of the first guide valve port (233) facing the second guide valve port (234); the other end of the protrusion (23131) is used to abut against the end of the second guide valve port (234) facing the first guide valve port (233).

2. The pilot-operated solenoid valve according to claim 1, characterized in that, The return spring (232) is connected to the first guide valve port (233); Both the first guide valve port (233) and the second guide valve port (234) are provided with a first O-ring (235) on their outer periphery.

3. The pilot-operated solenoid valve according to claim 2, characterized in that, The base part (2311) is fitted with a main valve core sealing ring (2314). The guide (2313) is provided with a lock nut (2315) on the end facing the exhaust port (223).

4. The pilot-operated solenoid valve according to claim 2, characterized in that, The valve body (21) includes a main valve body (211) and a front valve body (212) and a rear valve body (213) located at both ends of the main valve body (211); the rear valve body (213) is provided with the exhaust port (223); A second O-ring (214) is provided between the main valve body (211) and the rear valve body (213).

5. The pilot-operated solenoid valve according to claim 4, characterized in that, The pilot assembly (13) includes a moving iron core (131) with one end abutting against the pilot valve port (14) and a stationary iron core (132) spaced apart from the moving iron core (131). The central axes of the pilot valve port (14), the moving iron core (131), and the stationary iron core (132) are on the same straight line.

6. The pilot-operated solenoid valve according to claim 5, characterized in that, The moving iron core (131) has a hollow part (1311), and the two ends of the hollow part (1311) are respectively provided with a first sealing gasket (133) and a second sealing gasket (134). The first sealing gasket (133) and the second sealing gasket (134) are connected by a support spring (135); A fixing nut (136) is fitted on the end of the stationary iron core (132) away from the moving iron core (131).

7. The pilot-operated solenoid valve according to claim 6, characterized in that, The pilot assembly (13) also includes a pilot return spring (137) with one end connected to the moving iron core (131). The pilot return spring (137) is used to drive the moving iron core (131) to move and close the pilot valve port (14) when the electromagnetic force of the moving iron core (131) disappears.

8. The pilot-operated solenoid valve according to claim 5, characterized in that, The pilot-operated solenoid valve also includes a manual switch (3); The manual switch (3) includes a screwing part (31), a connecting part (32) located at the lower end of the screwing part (31), and a driving part (33) located at the lower end of the connecting part (32). The drive unit (33) is semi-cylindrical in shape and is used to abut against the moving iron core (131) so that rotating the screwing part (31) drives the drive unit (33) to move so that the moving iron core (131) can move along its axial direction.

9. The pilot-operated solenoid valve according to claim 1, characterized in that, The housing (11) is also provided with a solenoid valve coil for driving the pilot solenoid valve.

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