A double-drive interconnected electromagnetic pilot valve

Abstract

The present application relates to the technical field of valves, and in particular to a dual-drive interconnected electromagnetic pilot valve. The dual-drive interconnected electromagnetic pilot valve includes: a first pilot valve, which forms a first medium chamber; a second pilot valve, which forms a second medium chamber; a valve body, where both the first medium chamber and the second medium chamber are arranged inside the valve body; the valve body forms a medium passage; the valve body is provided with an interface for connecting with a target main valve, and the interface can communicate with the second medium chamber and the cavity of the target main valve; when both the first pilot valve and the second pilot valve are opened, the first medium chamber, the medium passage, the second medium chamber and the interface are sequentially communicated. The dual-drive interconnected electromagnetic pilot valve provided by the present application can enhance the stability of the pilot control of the target main valve, and the first pilot valve and the second pilot valve can be respectively subjected to on-line detection without affecting the state of the target main valve. When a failure occurs, maintenance or replacement can be carried out to ensure the stability of the target main valve.

Description

Technical Field

[0001] The present application relates to the technical field of valves, and particularly to a dual-drive interconnected electromagnetic pilot valve. Background Art

[0002] At present, for the pilot-operated high-pressure or high-temperature and high-pressure nuclear-grade valves of the medium self-driving type applied in related fields such as nuclear power plants, the system has very high requirements for the action reliability of the valves. When the system is operating normally or requires them to perform safety functions, the valves must be reliably closed or opened to achieve their intended functions.

[0003] The pilot drive of such valves generally controls the pressure of the medium in the piston chamber through the on-off of a step-by-step direct-acting electromagnetic pilot valve to achieve the opening and closing of the main valve. That is, once the electromagnetic pilot valve acts, it will inevitably cause the main valve to act. Therefore, the action reliability of the electromagnetic pilot valve is crucial for the reliability and safety of the whole valve. However, due to factors such as the presence of impurities in the medium, after being used for a period of time, impurities are likely to accumulate in the electromagnetic pilot valve, resulting in poor closing of the electromagnetic pilot valve, and then easily affecting the stability of the nuclear-grade valve and causing the nuclear-grade valve to open by mistake.

[0004] As an important device in the system, such nuclear-grade valves are now required to have an online detection function. However, the existing pilot drive valves have low reliability, and once an abnormality occurs, it will easily affect the stability of such nuclear-grade valves. Moreover, the existing pilot drive valves do not have an online detection function. When the pilot drive valve needs to be opened for detection, it will inevitably affect the state of the nuclear-grade valve. The existing pilot drive valves no longer meet this requirement. Summary of the Invention

[0005] The purpose of the present application is to provide a dual-drive interconnected electromagnetic pilot valve to solve, to a certain extent, the technical problems in the prior art that the reliability of the pilot drive mechanism of nuclear-grade valves is low and it does not have an online detection ability.

[0006] The present application provides a dual-drive interconnected electromagnetic pilot valve, including: a first pilot valve, the first pilot valve forming a first medium chamber;

[0007] a second pilot valve, the second pilot valve forming a second medium chamber;

[0008] a valve body, both the first medium chamber and the second medium chamber being arranged in the valve body; the valve body forming a medium channel;

[0009] The valve body is provided with an interface for connecting to a target main valve, and the interface can communicate with the second medium chamber and the cavity of the target main valve;

[0010] When both the first pilot valve and the second pilot valve are opened, the first medium chamber, the medium passage, the second medium chamber, and the interface are communicated in sequence.

[0011] In the above technical solution, further, the valve body is provided with a first connection part and a second connection part, the first pilot valve is arranged on the first connection part, and the second pilot valve is arranged on the second connection part.

[0012] In any of the above technical solutions, further, the first pilot valve includes:

[0013] A first valve sleeve assembly, and a spool assembly is arranged inside the first valve sleeve assembly;

[0014] The first valve sleeve assembly is connected to the first connection part, and a part of the spool assembly is located inside the first connection part.

[0015] In any of the above technical solutions, further, the second pilot valve includes:

[0016] A second valve sleeve assembly, and another set of the spool assembly is arranged inside the second valve sleeve assembly;

[0017] The second valve sleeve assembly is connected to the second connection part, and a part of another set of the spool assembly is located inside the second connection part.

[0018] In any of the above technical solutions, further, the first valve sleeve assembly includes:

[0019] A first housing;

[0020] A second housing, one end of the second housing is connected to the first housing, and the other end of the second housing is connected to the first connection part;

[0021] A valve head sleeve, which is arranged inside the first connection part, and the valve head sleeve forms the first medium chamber;

[0022] The second valve sleeve assembly includes:

[0023] A third housing;

[0024] A fourth housing, one end of the fourth housing is connected to the third housing, and the other end of the fourth housing is connected to the second connection part;

[0025] Another valve head sleeve, which is arranged inside the second connection part, and another valve head sleeve forms the second medium chamber.

[0026] In any of the above technical solutions, further, the spool assembly includes:

[0027] A coil, disposed within the first housing and the third housing;

[0028] A stationary iron core, disposed within the coil;

[0029] A moving iron core, at least partially disposed within the coil, and the moving iron core is capable of moving towards or away from the stationary iron core;

[0030] A valve stem, connected to an end of the moving iron core away from the stationary iron core;

[0031] A valve head, disposed within the valve head sleeve, and the valve head is connected to the valve stem.

[0032] In any of the above technical solutions, further, the valve head sleeve of the first pilot valve is provided with a drainage hole, the drainage hole is connected to a drainage pipe, and one end of the drainage pipe away from the drainage hole communicates with the medium channel.

[0033] In any of the above technical solutions, further, an end portion of the moving iron core facing the stationary iron core has a frustum structure;

[0034] An end of the stationary iron core facing the moving iron core forms an adaptively accommodating groove, and the shape of the space defined by the adaptively accommodating groove is adapted to the shape of the frustum structure;

[0035] The double-drive interconnected electromagnetic pilot valve further includes a connecting rod, the connecting rod is connected to the moving iron core and the connecting rod passes through the stationary iron core; a groove portion is formed at the bottom of the adaptively accommodating groove, a core spring is disposed in the groove portion, the core spring is sleeved on the connecting rod, and one end of the core spring can abut against the moving iron core.

[0036] In any of the above technical solutions, further, the double-drive interconnected electromagnetic pilot valve further includes:

[0037] A heat insulation sleeve, disposed within the second housing, for blocking the heat of the medium after temperature rise and pressure increase between the valve head sleeve and the first housing;

[0038] A guide body, disposed between the heat insulation sleeve and the valve head sleeve, the guide body forms a through channel, and the valve stem passes through the through channel; a limiting portion is formed on the second housing, and the limiting portion presses against the guide body.

[0039] In any of the above technical solutions, further, the first housing is provided with a fixing assembly; the fixing assembly includes:

[0040] A cover, a hoisting member is disposed at the center of the outer wall surface of the cover;

[0041] A connecting plate, the cover is provided on the connecting plate, and a signal component is provided on the connecting plate;

[0042] The connecting plate is connected to the first housing, a magnetic conductive plate is provided between the connecting plate and the first housing, the magnetic conductive plate is connected to the static iron core, and the magnetic conductive plate can limit the coil between the first housing and the static iron core.

[0043] Compared with the prior art, the beneficial effects of the present application are:

[0044] The dual-drive interconnected electromagnetic pilot valve provided by the present application includes: a first pilot valve, a first medium cavity is formed in the first pilot valve; a second pilot valve, a second medium cavity is formed in the second pilot valve; a valve body, both the first medium cavity and the second medium cavity are provided in the valve body; a medium channel is formed in the valve body; the valve body is provided with an interface for connecting to a target main valve, and the interface can communicate with the second medium cavity and the cavity of the target main valve; when both the first pilot valve and the second pilot valve are opened, the first medium cavity, the medium channel, the second medium cavity and the interface are connected in sequence.

[0045] For the dual-drive interconnected electromagnetic pilot valve provided by the present application, the first pilot valve can withstand and buffer the impact of high-temperature and high-pressure media, preventing the media from directly flushing the second pilot valve and causing the second pilot valve to malfunction and lead to unexpected situations such as the target main valve flashing open or malfunctioning, ensuring the stability of the pilot control of the dual-drive interconnected electromagnetic pilot valve over the target main valve. Even if a small amount of impurities in the high-temperature and high-pressure media accumulate, it will not cause abnormalities in both pilot valves simultaneously. And without affecting the state of the target main valve, the first pilot valve and the second pilot valve can be respectively detected online, so that when a failure occurs in the first pilot valve or the second pilot valve, it can be repaired or replaced to ensure the stability of the target main valve. Description of the Drawings

[0046] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0047] Figure 1 It is the first perspective view of the dual-drive interconnected electromagnetic pilot valve provided by the embodiment of the present application;

[0048] Figure 2 It is the second perspective view of the dual-drive interconnected electromagnetic pilot valve provided by the embodiment of the present application;

[0049] Figure 3 For Figure 1Cross-sectional view along A-A.

[0050] Reference numerals:

[0051] 100 - First pilot valve, 200 - Second pilot valve, 1 - Valve body, 101 - Medium passage, 102 - Medium inlet, 103 - Medium outlet, 104 - Outlet flange, 105 - Graphite wound gasket, 201 - First inlet, 202 - First outlet, 203 - Drain pipe, 301 - Second inlet, 302 - Second outlet, 4 - First housing, 5 - Second housing, 501 - Limiting part, 6 - Valve head sleeve, 7 - Insertion middle port, 8 - Insertion flange, 9 - Guide body, 10 - Moving iron core, 11 - Static iron core, 1101 - Adapted accommodation groove, 12 - Coil, 13 - Valve rod, 14 - Valve head, 15 - Piston, 16 - Connecting rod, 17 - Iron core spring, 18 - Buffer pad, 19 - Magnetic conductive plate, 20 - Return spring, 21 - Heat insulation sleeve, 22 - Lifting member, 23 - Connecting plug-in, 24 - Fixing component, 2401 - Cover, 2402 - Connecting plate, 25 - Signal component, 26 - Limiting sleeve, 27 - Fixing piece, 28 - Anti-rotation crimping piece. Detailed implementation manners

[0052] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present application.

[0053] Generally, the components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the present application claimed, but merely represents the selected embodiments of the present application.

[0054] All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0055] In the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present application. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0056] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0057] The following refers to Figures 1 to 3 Describe the dual-drive interconnected electromagnetic pilot valve according to the embodiments of the present application.

[0058] See Figures 1 to 3 As shown, the embodiments of the present application provide a dual-drive interconnected electromagnetic pilot valve for connecting with a target main valve, so that the dual-drive interconnected electromagnetic pilot valve is used as a pilot driving mechanism to drive the target main valve to open or close. Preferably, the target main valve can be a nuclear-grade valve.

[0059] The dual-drive interconnected electromagnetic pilot valve includes a valve body 1 and a series-connected first pilot valve 100 and second pilot valve 200. Among them, both the first pilot valve 100 and the second pilot valve 200 are arranged on the valve body 1. The first pilot valve 100 forms a first medium chamber, and the second pilot valve 200 forms a second medium chamber. Both the first pilot valve 100 and the second pilot valve 200 have an open state and a closed state. When one of them is open, the target main valve cannot be triggered to open. Only when both are in the open state at the same time, can there be a sufficient amount and pressure of the medium flowing to the target main valve to control the opening of the target main valve.

[0060] Specifically, the valve body 1 has an overall cuboid structure or a cylindrical structure. The valve body 1 is provided with a first connection part and a second connection part. The first pilot valve 100 is arranged on the first connection part, and the second pilot valve 200 is arranged on the second connection part. The valve body 1 is provided with a medium inlet 102 and a medium outlet 103. A medium channel 101 is formed inside the valve body 1. The first medium chamber and the second medium chamber are communicated through the medium channel 101.

[0061] Furthermore, the medium outlet 103 is provided with an outlet flange 104. The outlet flange 104 is connected to the valve body 1 through studs and bolts. The outlet flange 104 is used to connect with the target main valve. Preferably, a graphite wound gasket 105 is arranged in the gap between the outlet flange 104 and the medium outlet 103 to ensure the sealing between the two and can also play a role in shock absorption.

[0062] The first medium chamber is provided with a first inlet 201 and a first outlet 202, and the second medium chamber is provided with a second inlet 301 and a second outlet 302. The first inlet 201 is communicated with the medium inlet 102 of the valve body 1, and the first outlet 202 is communicated with the medium passage 101. The second inlet 301 is communicated with the medium passage 101, and the second outlet 302 is communicated with the medium outlet 103 of the valve body 1. When both the first pilot valve 100 and the second pilot valve 200 are in the open state, the medium inlet 102, the first medium chamber, the medium passage 101, the second medium chamber, and the medium outlet 103 are communicated in sequence. At this time, the medium can flow to the target main valve to drive the target main valve to open. When only one of the first pilot valve 100 and the second pilot valve 200 is open and the other is open, the target main valve cannot be controlled to open. In such a setting method, by the mutual cooperation of the first pilot valve 100 and the second pilot valve 200, the stability of the control of the target main valve can be ensured, the accidental opening of the target main valve can be avoided, and the on-line detection of the first pilot valve 100 and the second pilot valve 200 can be realized. When the first pilot valve 100 is closed, the second pilot valve 200 can be detected to confirm whether the second pilot valve 200 can be normally closed and opened. At this time, since the first pilot valve 100 is in the closed state, the target main valve will not be affected or accidentally opened. Similarly, when the second pilot valve 200 is closed, the first pilot valve 100 can be detected.

[0063] Further, the first pilot valve 100 includes a first valve sleeve assembly and a first valve core assembly, and the first valve core assembly is arranged inside the first valve sleeve assembly. In the state as shown in Figure 3 the bottom end of the first valve sleeve assembly is connected to the first connecting portion.

[0064] The first valve sleeve assembly includes a first housing 4 and a second housing 5 which are connected to each other, and further includes a valve head sleeve 6 arranged inside the valve body 1. The inside of the valve head sleeve 6 forms a first medium chamber which can be communicated with the medium passage 101. In the state as shown in Figure 3 the bottom end of the first housing 4 is connected to the top end of the second housing 5, and the bottom end of the second housing 5 is connected to the first connecting portion of the valve body 1. Preferably, the second housing 5 is formed with a fixing portion convex portion, the diameter of the fixing convex portion is larger than the diameter of the second housing 5, and the fixing convex portion is connected to the valve body 1 through a double-headed bolt and a nut. More preferably, when the nut is tightened with the upper end of the double-headed bolt, a washer is arranged between the nut and the fixing convex portion to ensure the stability between the second housing 5 and the valve body 1. Preferably, a gasket is arranged between the valve seat sleeve and the valve body 1.

[0065] Preferably, the embodiment of the present application further includes an anti-rotation crimping member 28. The anti-rotation crimping member 28 has a rod structure. At the position where the first housing 4 is connected to the second housing 5, the anti-rotation crimping member 28 penetrates through the first housing 4 and the second housing 5 along the radial directions of the first housing 4 and the second housing 5, which can not only fix the two but also prevent relative movement between the first housing 4 and the second housing 5. The number of the anti-rotation crimping members 28 is at least two, and the at least two anti-rotation crimping members 28 are arranged at intervals along the circumferences of the first housing 4 and the second housing 5. More preferably, the at least two anti-rotation crimping members 28 are arranged at equal intervals.

[0066] Further, the valve head sleeve 6 is also provided with a drainage hole, and the drainage hole communicates with the first medium chamber. A drainage pipe 203 is arranged in the drainage hole. Preferably, one end of the drainage pipe 203 is detachably connected to the drainage hole, and the other end of the drainage pipe 203 is detachably connected to the medium channel 101, so that both ends of the drainage pipe 203 can communicate with the first medium chamber and the medium channel 101 respectively, and drainage pipes 203 with different apertures can be replaced. When the first pilot valve 100 is opened instantaneously, the medium flows into the medium channel 101 from the first medium chamber. At the same time, a small amount of the medium also flows into the drainage pipe 203, so that a small amount of the medium can flow into the second medium chamber, but this small amount of the medium is not enough to drive the second pilot valve 200 to open, and the second pilot valve 200 remains closed and will not affect the target main valve. With such a design, a small amount of the medium can be retained in the second medium chamber, so that the second pilot valve 200 can have a self-sealing force under the action of the medium, and the passageway from the first medium chamber through the drainage pipe 203 and the medium channel to the second medium chamber is always in a conducting state, which can boost the pressure for the second pilot valve 200 to keep the second medium chamber sealed all the time, thus ensuring the stability of the target valve.

[0067] Preferably, the lower end of the second housing 5 has a stepped structure. Preferably, the number of steps of the stepped structure is not less than three. Along the direction from top to bottom, as the direction of each step goes, the diameter of the second housing 5 gradually decreases, so that the part of the lower end of the second housing 5 closest to the port forms a plugging middle port 7, and the first connecting portion is formed with a plugging flange 8. After arranging the following guiding body 9 on the first connecting portion, a gap is formed between the plugging flange 8 and the guiding body 9. The shape and thickness of this gap are just adapted to the shape and thickness of the plugging middle port 7. The mutually adapted plugging middle port 7 and the plugging flange 8 are adaptively connected. The plugging middle port 7 is located between the plugging flange 8 and the guiding body 9, and the end face of the second-step structure is pressed on the upper end face of the disassembling flange, so that the second housing 5 is adaptively connected to the valve body 1 and has good stability and sealing effect. Preferably, a middle port gasket is arranged between the end face of the plugging middle port 7 and the first connecting portion.

[0068] The first spool assembly includes: a moving iron core 10, a stationary iron core 11, a coil 12, a valve stem 13, and a valve head 14 disposed in the first housing 4. Among them, the coil 12 is laid along the inner wall of the first housing 4. The stationary iron core 11 is disposed inside the coil 12 and is close to the upper opening of the coil 12. The moving iron core 10 is disposed inside the coil 12. When the energized and de-energized states of the coil 12 change, the moving iron core 10 can move relative to the stationary iron core 11. One end of the valve stem 13 is connected to the moving iron core 10, and the valve head 14 is located inside the valve head sleeve 6, and the valve head 14 is connected to the end of the valve stem 13 away from the moving iron core 10, so that the valve head 14 and the valve stem 13 can move synchronously with the moving iron core 10. The specific movement process is as follows: The valve head 14 and the valve stem 13 move up and down with the moving iron core 10 in Figure 3 the state shown.

[0069] Preferably, a groove portion is formed on the end face of the stationary iron core 11 facing the moving iron core 10. A connecting rod 16 is connected to the upper end of the moving iron core 10. A core spring 17 is sleeved on the portion of the connecting rod 16 close to the moving iron core 10, and a part of the core spring 17 is located inside the groove portion. The lower end of the core spring 17 can abut against the moving iron core 10. When the moving iron core 10 moves towards the stationary iron core 11, the core spring 17 can play a buffering role.

[0070] Preferably, as Figure 3 shown, one end of the moving iron core 10 facing the stationary iron core 11 has a frustum structure, and its longitudinal section is trapezoidal. The end face of the stationary iron core 11 facing the moving iron core 10 is recessed inward to form a fitting receiving groove 1101. The shape defined by the fitting receiving groove 1101 is adapted to the shape of the end portion of the moving iron core 10, so that the end portion of the moving iron core 10 can enter the fitting receiving groove 1101 of the stationary iron core 11, which can not only ensure the adsorption effect and movement stroke between the moving iron core 10 and the stationary iron core 11, but also help reduce the space jointly occupied by the stationary iron core 11 and the moving iron core 10 in the vertical direction, thereby helping to reduce the overall volume and weight of the first pilot valve 100. Preferably, a buffer pad 18 is further provided on the end face of the moving iron core 10.

[0071] The valve head 14 is provided with a piston 15. When the coil 12 is de-energized, the valve head 14 and the piston 15 block the first medium chamber in the first medium chamber. When the coil 12 is energized, the valve head 14 and the piston 15 rise with the moving iron core 10. At this time, the valve head 14 and the piston 15 provided on the valve head 14 are in the upper-middle position in the first medium chamber, so that the first medium chamber can communicate with the medium passage 101.

[0072] Further, the first spool assembly further includes a magnetic conductive plate 19. The magnetic conductive plate 19 is disposed at the upper end of the coil 12. A through hole is formed in the center of the magnetic conductive plate 19. A limiting convex portion is formed at the upper end of the static iron core 11. The diameter of the limiting convex portion is smaller than the diameter of the portion of the static iron core 11 other than the limiting convex portion. The diameter and shape of the limiting convex portion are adapted to the diameter and shape of the through hole of the magnetic conductive plate 19, so that the limiting convex portion can be tightly inserted into the through hole. The magnetic conductive plate 19 is formed with a plurality of connection holes for passing through set screws, so that after the set screws pass through the connection holes, they can be connected to the static iron core 11. It can be seen that the magnetic conductive plate 19 can not only interfere with the magnetic field generated after the coil 12 is energized, but also press the coil 12 and the static iron core 11 in the first housing 4 to ensure the stability of the coil 12, the static iron core 11 and the moving iron core 10.

[0073] Further, the second pilot valve 200 includes a second valve sleeve assembly and a second spool assembly. The second spool assembly is disposed within the second valve sleeve assembly. In the state as shown in Figure 3 shown, the bottom end of the second valve sleeve assembly is connected to the second connecting portion. The structure of the second valve sleeve assembly is the same as that of the first valve sleeve assembly, and the connection method is also the same. Those skilled in the art can fully understand and will not be repeated here.

[0074] The structure of the second spool assembly is the same as that of the first spool assembly, and the working principle is also the same. Those skilled in the art can fully understand and will not be repeated here.

[0075] Preferably, both the first pilot valve 100 and the second pilot valve 200 are step-by-step direct-acting normally closed solenoid valves and both have a medium self-sealing structure.

[0076] Further, the first spool assembly further includes a return spring 20. Along the vertical direction, a guide body 9 is disposed above the valve head sleeve 6. The guide body 9 has a cylindrical structure, and a through channel is formed along the height direction of the center of the guide body 9. The valve stem 13 is inserted into the through channel. The guide body 9 can guide the valve stem 13 during the movement of the valve stem 13 along with the moving iron core 10. The valve stem 13 is provided with a limiting sleeve 26 and a fixing member 27. The limiting sleeve 26 is disposed near the lower end of the valve stem 13. The return spring 20 is disposed between the limiting sleeve 26 and the guide body 9. The return spring 20 is respectively connected to the limiting sleeve 26 and the fixing member 27. When the coil 12 is de-energized, under the action of the gravity of the moving iron core 10 and the pulling force of the return spring 20, the valve stem 13, the valve head 14 and the piston 15 can be stably located in the first medium cavity to block the first medium cavity.

[0077] Further, a limiting portion 501 is formed on the inner wall of the second housing 5. The guiding body 9 is arranged between the limiting portion 501 and the valve head sleeve 6, and the height of the guiding body 9 is approximately equal to the height between the limiting portion 501 and the valve head sleeve 6. The shape of the upper end of the guiding body 9 is adapted to the shape of the limiting portion 501, so that the guiding body 9 can be stably selected between the second housing 5 and the valve body 1, and the guiding body 9 can also stably abut against the valve head sleeve 6 to ensure the stability of the valve head sleeve 6 in the valve body 1. That is to say, the guiding body 9 can not only guide the valve rod 13, but also limit and press the valve head sleeve 6.

[0078] Further, the double-drive interconnected electromagnetic pilot valve provided by the present application further includes a heat insulation sleeve 21. The heat insulation sleeve 21 is arranged in the second housing 5 and sleeved on the valve rod 13. The upper end of the heat insulation sleeve 21 is close to the upper end of the second housing 5, and the lower end of the heat insulation sleeve 21 is close to the guiding body 9. The heat insulation sleeve 21 has high-temperature resistance. The medium of the present application is specifically a high-temperature and high-pressure medium. When the medium flows into the first medium chamber and / or the second medium chamber, the temperature in the first medium chamber and the second medium chamber will rise. The heat insulation sleeve 21 plays a blocking role to prevent heat from entering the first housing 4 and affecting the normal operation of the coil 12 or other electronic devices.

[0079] Further, a fixing assembly 24 and a signal assembly 25 are arranged at the upper end of the first housing 4. The fixing assembly 24 includes: a cover 2401 and a connecting plate 2402. The connecting plate 2402 is connected to the upper end opening of the first housing 4, and the cover 2401 is connected to the connecting plate 2402. The connecting plate 2402 is provided with a signal assembly 25 and an electromagnetic head, etc. A lifting channel is formed inside the fixing assembly 24, and the valve rod 13 is arranged in the lifting channel and can rise or fall in the lifting channel.

[0080] In addition, the connecting plate 2402 can press the magnetic conductive plate 19 to keep the magnetic conductive plate 19 in a fixed state without moving or displacing, so as to ensure the stability of the magnetic conductive plate 19 and the coil 12.

[0081] Preferably, a hoisting member 22 is arranged at the central position on the outer surface of the cover 2401 for hoisting the first pilot valve 100 by using a hoisting device.

[0082] Further, the connecting plate is provided with a plurality of quick-connect plugs for connecting the plug-in 23. The quick-connect plugs are connected to the signal assembly 25 and the coil 12 arranged in the cover 2401. The connection method can be electrical connection, communication connection, etc. The quick-connect plugs are at least divided into a power supply connector and a signal connector, so that after being connected to a power supply or a signal transmitting device, the quick-connect plugs can transmit to the signal assembly 25 to control the working state of the first pilot valve 100 and / or the second pilot valve 200.

[0083] The double-drive interconnected electromagnetic pilot valve provided by the present application connects the normally-closed first pilot valve 100 and the second pilot valve 200 in series and installs them in the same valve body 1. When the double-drive interconnected electromagnetic pilot valve is working, both the first pilot valve 100 and the second pilot valve 200 are in the valve-closed state when de-energized, and are in the valve-open state after being energized.

[0084] When the first pilot valve 100 and / or the second pilot valve 200 is energized, the coil 12 is energized and magnetized, the moving iron core 10 pulls up the valve stem 13 to open the valve head 14 and the piston 15, and the high-temperature and high-pressure medium in the upper chamber of the piston 15 is quickly discharged. The pressure in the lower chamber of the piston 15 is higher than that in the upper chamber. Under the action of electromagnetic force and medium pressure difference force, it moves upward against the spring force and its own weight to open the main valve, connect the pipeline medium, and the valve is in the open state. The built-in contact of the valve-opening signal closes, and the built-in contact of the valve-closing signal disconnects.

[0085] When the first pilot valve 100 and / or the second pilot valve 200 is de-energized, the open state changes to the closed state, the coil 12 is de-energized and demagnetized, the moving iron core 10, the valve head 14, etc. move downward under the action of the spring force, close the pilot valve hole, the pressure in the upper chamber of the piston 15 rises rapidly, and the piston 15 moves downward under the action of the spring force and the medium pressure difference force to close the medium chamber, cut off the medium, and the valve is in the valve-closed state. The built-in contact of the valve-closing signal closes, and the built-in contact of the valve-opening signal disconnects.

[0086] It should be noted that the first pilot valve 100 and the second pilot valve 200 can be controlled separately or simultaneously.

[0087] It can be seen that for the double-drive interconnected electromagnetic pilot valve provided by the present application, the first pilot valve can resist and buffer the impact of high-temperature and high-pressure media, avoid the direct scouring of the second pilot valve by the media, and prevent the second pilot valve from accidentally opening, resulting in unexpected situations such as the target main valve suddenly opening or malfunctioning. This ensures the stability of the pilot control of the target main valve by the double-drive interconnected electromagnetic pilot valve. Even if a small amount of impurities in the high-temperature and high-pressure media accumulate, it will not cause abnormalities in both pilot valves at the same time. And without affecting the state of the target main valve, the first pilot valve and the second pilot valve can be respectively detected online, so that when a fault occurs in the first pilot valve or the second pilot valve, it can be repaired or replaced to ensure the stability of the target main valve.

[0088] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A dual-drive interconnected electromagnetic pilot valve, characterized in that, it includes: A first pilot valve, which forms a first medium cavity; A second pilot valve, which forms a second medium cavity; A valve body, both the first medium cavity and the second medium cavity are arranged in the valve body; the valve body forms a medium channel; The valve body is provided with an interface for connecting to a target main valve, and the interface can communicate with the second medium cavity and the cavity of the target main valve; When both the first pilot valve and the second pilot valve are opened, the first medium cavity, the medium channel, the second medium cavity and the interface are connected in sequence; The valve body is provided with a first connecting part and a second connecting part, the first pilot valve is arranged on the first connecting part, and the second pilot valve is arranged on the second connecting part; the valve body is provided with a medium inlet and a medium outlet; The first pilot valve includes: A first valve sleeve assembly, inside which a spool assembly is arranged; The first valve sleeve assembly is connected to the first connecting part, and part of the spool assembly is located inside the first connecting part; The second pilot valve includes: A second valve sleeve assembly, inside which another group of the spool assembly is arranged; The second valve sleeve assembly is connected to the second connecting part, and part of another group of the spool assembly is located inside the second connecting part; The first valve sleeve assembly includes: a valve head sleeve, arranged inside the first connecting part; The valve head sleeve of the first pilot valve is provided with a drainage hole, and a drainage pipe is connected to the drainage hole, and the end of the drainage pipe away from the drainage hole communicates with the medium channel.

2. The dual-drive interconnected electromagnetic pilot valve according to claim 1, characterized in that, The first valve sleeve assembly further includes: A first housing; A second housing, one end of the second housing is connected to the first housing, and the other end of the second housing is connected to the first connecting part; the valve head sleeve forms the first medium cavity; The second valve sleeve assembly includes: A third housing; A fourth housing, one end of the fourth housing is connected to the third housing, and the other end of the fourth housing is connected to the second connecting part; Another valve head sleeve, arranged inside the second connecting part, and another valve head sleeve forms the second medium cavity.

3. The dual-drive interconnected electromagnetic pilot valve according to claim 2, characterized in that, The spool assembly includes: A coil, arranged inside the first housing and the third housing; A static iron core, arranged inside the coil; A moving iron core, at least part of which is arranged inside the coil, and the moving iron core can move towards or away from the static iron core; A valve rod, connected to the end of the moving iron core away from the static iron core; A valve head, arranged inside the valve head sleeve, and the valve head is connected to the valve rod.

4. The dual-drive interconnected electromagnetic pilot valve according to claim 3, characterized in that, One end of the moving iron core facing the static iron core has a frustum structure; One end of the static iron core facing the moving iron core is formed with an adapted receiving groove, and the spatial shape defined by the adapted receiving groove is adapted to the shape of the frustum structure; The double-drive interconnected electromagnetic pilot valve further includes a connecting rod, the connecting rod is connected to the moving iron core and the connecting rod passes through the static iron core; a groove portion is formed at the bottom of the adapted receiving groove, a core spring is arranged in the groove portion, the core spring is sleeved on the connecting rod, and one end of the core spring can abut against the moving iron core.

5. The double-drive interconnected electromagnetic pilot valve according to claim 3, characterized in that the double-drive interconnected electromagnetic pilot valve further includes: a heat insulation sleeve, arranged in the second housing, for blocking the heat of the medium after temperature rise and pressure increase between the valve head sleeve and the first housing; a guide body, arranged between the heat insulation sleeve and the valve head sleeve, the guide body is formed with a through channel, and the valve rod passes through the through channel; a limiting portion is formed on the second housing, and the limiting portion presses against the guide body.

6. The double-drive interconnected electromagnetic pilot valve according to claim 3, characterized in that the first housing is provided with a fixing assembly; the fixing assembly includes: a cover, a hoisting member is arranged at the center of the outer wall surface of the cover; a connecting plate, the cover is covered on the connecting plate, and a signal assembly is arranged on the connecting plate; the connecting plate is connected to the first housing, a magnetic conduction plate is arranged between the connecting plate and the first housing, the magnetic conduction plate is connected to the static iron core, and the magnetic conduction plate can limit the coil between the first housing and the static iron core.

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