Pilot operated two-position three-way nuclear grade high flow solenoid valve

Abstract

This invention provides a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve, comprising a valve body, a valve stem assembly, and a pilot head. The valve body includes a normally closed pressure port, a normally open pressure port, an exhaust port, a first valve port, a second valve port, a pilot valve port, and a piston chamber. One end of the pilot valve port is connected to the normally closed pressure port via a pressure-facing channel, and the other end is connected to the piston chamber via a pressure-inlet channel. The valve stem assembly is vertically and vertically mounted within the valve body and includes a valve stem, a piston mounted on the valve stem, a first sealing structure, and a second sealing structure. The piston is slidably mounted within the piston chamber. The pilot head is installed at the pilot valve port and is used to open and close the pilot valve port, thereby connecting or disconnecting the normally closed pressure port from the piston chamber, thus driving the valve stem assembly to move up and down. This invention provides a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve suitable for high-flow and high-pressure media, with convenient opening and good sealing performance.

Description

Technical Field

[0001] This invention relates to the field of two-position three-way solenoid valve technology, specifically to a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve. Background Technology

[0002] The 2-position 3-way high-flow solenoid valve is a key component in the nuclear power plant's actuator system, controlling large diaphragm valves, cylinders, and other high-flow-rate components. Due to its characteristics—fast switching speed, large diameter, high pressure, and stringent sealing requirements—many domestic solenoid valve manufacturers have been deterred from developing this technology.

[0003] Firstly, at a DN25 diameter and a gas pressure of 4.0 MPa, the flow rate and response are unmatched by some previous small-diameter solenoid valves. Especially during switching, it's crucial to ensure both flexible and rapid action, as well as excellent sealing with no leakage at either end of the valve in a static state after switching. This presents significant challenges to the sealing structure design, materials, processes, and solenoid coils. Under large diameter and high pressure, the valve port must withstand a 4.0 MPa impact without any leakage when normally closed, which is impossible with previous three-way solenoid valves. Existing two-position three-way solenoid valves are limited to a DN15mm diameter and operate at pressures up to 1.0 MPa. Under normally closed conditions, they rely solely on a strong spring to seal the valve port. While this strong spring achieves leak-free operation at 1.0 MPa, it places even higher demands on the electromagnetic force of the coil. Moreover, nuclear-grade two-position three-way high-flow solenoid valves operate at 4.0 MPa with a DN25mm diameter. In existing two-position three-way solenoid valves, the valve port seals are all assembled by compression. Under high pressure, engineers often overlook the characteristics of high pressure and the design of the sealing structure, causing the overall solenoid valve seal to fail. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] In view of this, the present invention provides a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve, overcoming the shortcomings of existing two-position three-way solenoid valves that are not suitable for high flow and high pressure.

[0006] (II) Technical Solution

[0007] To solve the aforementioned technical problem, the present invention provides a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve, comprising:

[0008] The valve body contains a normally closed pressure port, a normally open pressure port, an exhaust port, a first valve port for connecting the normally closed pressure port and the normally open pressure port, a second valve port for connecting the normally open pressure port and the exhaust port, a pilot valve port, and a piston chamber. One end of the pilot valve port is connected to the normally closed pressure port through a pressure-facing channel, and the other end is connected to the piston chamber through a pressure-inlet channel.

[0009] A valve stem assembly is vertically and retractably mounted in the valve body. It includes a valve stem, a piston mounted on the valve stem, a first sealing structure, and a second sealing structure. The piston is slidably mounted in the piston chamber. The first sealing structure is used to open and close the first valve port, and the second sealing structure is used to open and close the second valve port.

[0010] A pilot head, installed at the pilot valve port, is used to open and close the pilot valve port, thereby connecting or disconnecting the normally closed pressure port from the piston chamber, and driving the valve stem assembly to rise and fall. This design employs a pilot-operated structure with a pressure-receiving channel in the valve body, simplifying the complex structure and introducing the pressure from the normally closed pressure port to the pilot valve port, thus reducing the pressure directly acting on the first valve port and making valve opening easier.

[0011] In some embodiments, the first sealing structure includes a sealing seat mounted on the valve stem, a pressure plate placed inside the sealing seat, and a sealing ring mounted between the sealing seat and the pressure plate. The pressure plate has a tapered wall on one side of the sealing ring, and the sealing seat has an arcuate groove on the other side of the sealing ring.

[0012] Under normal conditions, one end of the sealing ring protrudes from the end faces of the sealing seat and the pressure plate, and an arc-shaped gap cavity is formed between the inner wall of the arc-shaped groove and the sealing ring. When the wall of the first valve port presses against the protruding part of the sealing ring, the sealing ring deforms and fills the arc-shaped gap cavity. This solution, with its first sealing structure, solves the problem of significantly reduced sealing life due to forced compression caused by insufficient sealing interference, thus ensuring a good sealing effect.

[0013] In some embodiments, a buffer zone is formed between the conical wall, the sealing seat, and the sealing ring; one end of the sealing seat is provided with a convex ring, the arcuate groove is provided inside the convex ring, and the interior of the convex ring is provided with a receiving groove for accommodating the pressure plate.

[0014] In some embodiments, the pressure plate and the sealing seat are both fitted onto the valve stem, the valve stem has a shoulder on one side of the pressure plate, and a fastening nut is threaded onto the side of the valve stem located on the sealing seat; after tightening the fastening nut, the shoulder, the pressure plate, and the sealing seat are locked together.

[0015] In some embodiments, the pilot head includes a magnetic shielding tube assembly threaded onto the valve body, a movable iron core that can be lifted and lowered within the magnetic shielding tube assembly, and an electromagnetic coil. The magnetic shielding tube assembly is provided with a pilot exhaust port, and the pressure inlet channel can communicate with the outside through the pilot exhaust port.

[0016] The movable iron core includes a movable iron core body positioned between the pilot valve port and the pilot exhaust port, and an upper floating seal and a lower floating seal respectively installed at the upper and lower ends of the movable iron core body. The upper floating seal corresponds to the pilot exhaust port, and the lower floating seal corresponds to the pilot valve port. An inner spring is installed between the upper floating seal and the lower floating seal. The upper and lower ends of the movable iron core body are respectively expanded outward to form a trumpet-shaped expansion absorption area, which is used to absorb the deformation of the upper floating seal and the lower floating seal.

[0017] In some embodiments, the lower end of the movable iron core body is provided with a lower limiting step for restricting the lower floating seal from dislodging from the movable iron core body, and the upper end is provided with an upper limiting step for restricting the upper floating seal from dislodging from the movable iron core body; the lower end of the movable iron core body is provided with a limiting flange, and a tower spring is installed between the limiting flange and the magnetic shielding tube assembly; the movable iron core body is provided with multiple airflow channels, and the pressure inlet channel is connected to the pilot exhaust port through the airflow channels.

[0018] In some embodiments, a manual opening device is installed inside the valve body for manually driving the movable iron core when the solenoid coil fails. The manual opening device includes a sliding rod slidably installed horizontally inside the valve body, one end of which extends to the underside of the movable iron core, and the extended end of the sliding rod is provided with a shovel-shaped portion. When manually opening, sliding the sliding rod lifts the movable iron core through the shovel-shaped portion, causing it to disengage from the pilot valve port. This solution, with its manual opening device, allows for convenient operation when the surrounding environment is abnormal and power cannot be supplied to the solenoid coil, but the solenoid valve must be switched; simply pressing the sliding rod inward is sufficient.

[0019] In some embodiments, the shovel-shaped portion is provided with an inclined push wall for lifting the movable iron core, and a gap is left on the lower side of the movable iron core, with the shovel-shaped portion extending into the gap; a pressing head is provided at one end of the sliding rod outside the valve body, and a sliding rod spring is installed between the pressing head and the valve body; a limiting hole is provided on the sliding rod, and a limiting pin is vertically inserted into the valve body, with the limiting pin passing through the limiting hole.

[0020] In some embodiments, a muffler communicating with the exhaust port is installed on the valve body; the muffler includes a plurality of vertically stacked sound-absorbing plates and a sound-absorbing cover plate at the top, and a support boss is provided on the end face of the sound-absorbing plates and the sound-absorbing cover plate, the support boss leaving an airflow gap between two adjacent sound-absorbing plates and between the sound-absorbing plates and the sound-absorbing cover plate; the sound-absorbing plates are provided with a central hole, and the diameter of the plurality of central holes gradually decreases from bottom to top.

[0021] In some embodiments, a guide hole is provided in the valve body, the guide hole is arranged coaxially with the piston chamber, a guide rod adapted to the guide hole is provided at the lower end of the valve stem, and a valve stem spring is installed between the valve body and the valve stem assembly.

[0022] (III) Beneficial Effects

[0023] Compared with the prior art, the beneficial effects that at least one technical solution adopted in the embodiments of this specification can achieve include at least:

[0024] 1) Adopting a high-inlet, low-outlet structure, the valve body is equipped with a pressure-facing channel, which introduces the pressure of the normally closed pressure port into the pilot valve port position, simplifying the original complex structure and effectively reducing the pressure directly acting on the first valve port, making the valve opening operation easier and more convenient. Especially in the application of three-way solenoid valves in high-pressure environments, it can achieve opening control of large pressure with a small force, and is suitable for large flow and high pressure media.

[0025] 2) The first sealing structure is adopted. When the wall of the first valve port squeezes the protruding part of the sealing ring, the sealing interference of the sealing ring just fills the arc gap cavity. At this time, the seal is flat and the sealing effect is optimal. This solves the problem that the sealing life is greatly reduced due to the forced compression caused by the sealing interference having nowhere to be released. It effectively extends the service life and ensures the sealing effect.

[0026] 3) An internal spring is added to the movable iron core, which allows the two floating seals to slide up and down within a certain distance. When the seals are squeezed, the two floating seals can automatically adjust their positions within a certain range. The expansion absorption zone allows the deformation of the two floating seals to be released, avoiding excessive compression of the seals, extending the service life of the seals, and ensuring the flatness of the sealing surface, thus improving the sealing effect.

[0027] 4) A manual opening device is added. When the electromagnetic coil fails, the movable iron core can be driven manually. The operation is simple. Without affecting the electromagnetic control function of the pilot head, it also has the function of manual opening, which increases its functionality and makes it more reliable. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve according to the present invention.

[0030] Figure 2 This is a schematic diagram of the structure of a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve of the present invention, in which the normally closed pressure port, the pressure-facing channel and the pilot valve port are connected.

[0031] Figure 3 This is a schematic diagram of the structure of a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve of the present invention, in which the pilot valve port, the pressure inlet channel and the piston chamber are connected.

[0032] Figure 4 This is a schematic diagram of the structure of a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve of the present invention, in which the piston chamber and the guide hole are arranged coaxially.

[0033] Figure 5 This is a schematic diagram of the valve stem assembly in a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve of the present invention.

[0034] Figure 6 This is a schematic diagram of the first sealing structure in a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve of the present invention.

[0035] Figure 7 This is a schematic diagram of the connection between the sealing seat, pressure plate, and sealing ring in a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve of the present invention.

[0036] Figure 8 This is a schematic diagram of the structure of the first sealing structure sealing the first valve port in a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve of the present invention.

[0037] Figure 9 This is a schematic diagram of the sealing seat structure in a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve of the present invention.

[0038] Figure 10 This is a schematic diagram of the connection between the valve body, pilot head, and manual opening device in a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve of the present invention.

[0039] Figure 11 This is a schematic diagram of the movable iron core in a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve of the present invention.

[0040] Figure 12This is a schematic diagram of the connection between the lower floating seal and the movable iron core body in a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve of the present invention.

[0041] Figure 13 This is a schematic diagram of the structure of the magnetic tube assembly in a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve according to the present invention.

[0042] Figure 14 This is a schematic diagram of the silencer structure in a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve of the present invention.

[0043] Figure 15 This is a perspective view of the silencer in a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve according to the present invention.

[0044] Figure 16 This is a schematic diagram of the manual opening device in a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve according to the present invention.

[0045] Figure 17 This is a schematic diagram of the sliding rod structure in a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve of the present invention.

[0046] The component names corresponding to the various reference numerals in the figure are as follows: 1. Valve body; 11. Valve body main body; 12. Side valve block; 13. Valve cover; 101. Normally closed pressure port; 102. Normally open pressure port; 103. Exhaust port; 104. First valve port; 105. Second valve port; 106. Pilot valve port; 107. Piston chamber; 108. Pressure-facing passage; 1081. First section of flow channel; 1082. Second section of flow channel; 083. Three-section flow channel; 109. Pressure inlet channel; 110. Clearance; 111. Guide hole; 2. Valve stem assembly; 21. Valve stem; 22. Piston; 23. Shoulder; 24. Fastening nut; 25. Guide rod; 3. First sealing structure; 31. Sealing seat; 311. Arc groove; 312. Convex ring; 313. Receiving groove; 32. Pressure plate; 321. Conical wall; 33. Sealing ring; 34. Circular 35. Arc gap cavity; 4. Buffer zone; 5. Second sealing structure; 6. Pilot head; 7. Magnetic shielding tube assembly; 8. Pilot exhaust port; 9. Movable iron core; 10. Movable iron core body; 11. Upper floating seal; 22. Lower floating seal; 33. Expansion absorption zone; 4. Lower limit step; 54. Upper limit step; 55. Limit flange; 66. Airflow channel; 77. Electromagnetic coil; 8. Tower spring; 9. Manual opening device; 10. Sliding rod; 11. Shovel-shaped part; 12. Inclined push wall; 13. Press head; 14. Limiting perforation; 15. Sliding rod spring; 16. Limiting pin; 17. Silencer; 18. Silencing plate; 19. Support boss; 20. Center hole; 21. Silencing cover plate; 32. Airflow gap; 43. Valve stem spring. Detailed Implementation

[0047] The embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0048] The following specific examples illustrate the implementation of this application. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. This application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be noted that, in the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0049] It should be noted that various aspects of embodiments within the scope of the appended claims are described below. It will be apparent that the aspects described herein can be embodied in a wide variety of forms, and any particular structure and / or function described herein is merely illustrative. Based on this application, those skilled in the art will understand that one aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspects set forth herein can be used to implement the device and / or practice the method. Additionally, this device and / or method can be implemented using structures and / or functionalities other than one or more of the aspects set forth herein.

[0050] It should also be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. The illustrations only show the components related to this application and are not drawn according to the number, shape and size of the components in actual implementation. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0051] Additionally, specific details are provided in the following description to facilitate a thorough understanding of the examples. However, those skilled in the art will understand that practice can be carried out without these specific details.

[0052] Combination Figures 1-17 As shown, the present invention provides a pilot-operated two-position three-way nuclear-grade high-flow solenoid valve, comprising a valve body 1, a valve stem assembly 2, and a pilot head 5.

[0053] See Figures 1 to 3The valve body 1 includes a valve body main body 11, a side valve block 12 fixed to the side end of the valve body main body 11, and a valve cover 13 fixed to the upper end of the valve body main body 11. The side valve block 12 of the valve body 1 is provided with a normally closed pressure port 101, a normally open pressure port 102, and an exhaust port 103 arranged sequentially from bottom to top. The valve body main body 11 of the valve body 1 is provided with a first valve port 104 for connecting the normally closed pressure port 101 and the normally open pressure port 102, and a second valve port 105 for connecting the normally open pressure port 102 and the exhaust port 103. The two valve ports are arranged coaxially, and the first valve port 104 is located directly below the second valve port 105. The valve body 1 has a pilot valve port 106 and a piston chamber 107 inside the valve cover 13. The pilot valve port 106 is located above the piston chamber 107. One end of the pilot valve port 106 is connected to the normally closed pressure port 101 through the pressure-facing channel 108, and the other end of the pilot valve port 106 is connected to the piston chamber 107 through the pressure-inlet channel 109. The pilot valve port 106 is located between the pressure-facing channel 108 and the pressure-inlet channel 109. By opening or closing the pilot valve port 106, the pressure-facing channel 108 and the pressure-inlet channel 109 can be connected or disconnected, thereby connecting or disconnecting the normally closed pressure port 101 and the piston chamber 107.

[0054] See Figure 2 The pressure-receiving channel 108 consists of three sequentially connected flow channels: a first flow channel 1081, a second flow channel 1082, and a third flow channel 1083. The first end of the first flow channel 1081 is connected to the normally closed pressure port 101, and the last end of the third flow channel 1083 is connected to the pilot valve port 106. In this design, the pressure from the normally closed pressure port 101 is directly introduced to the pilot valve port 106 through the pressure-receiving channel 108, preventing the high-pressure gas from directly acting on the first valve port 104. Under the same pressure, the area of ​​the pilot valve port 106 is much smaller than that of the first valve port 104, making it easier and more convenient to open the solenoid valve.

[0055] See Figure 1 , Figure 4 and Figure 5 The valve stem assembly 2 is vertically and retractably installed within the valve body body 11 of the valve body 1, used to open and close the first valve port 104 and the second valve port 105. The valve stem assembly 2 includes a vertically arranged valve stem 21, a piston 22, a first sealing structure 3, and a second sealing structure 4 mounted on the valve stem 21. The piston 22, the first sealing structure 3, the second sealing structure 4, and the valve stem 21 are arranged coaxially. The walls of the first valve port 104 and the second valve port 105 are parallel, enabling smooth movement of the valve stem assembly 2 and ensuring stable, leak-free sealing at both ends. The piston 22 is slidably installed within the piston cavity 107, and a sealing ring is fitted onto the outer circumferential wall of the piston 22 to ensure a tight seal.

[0056] See Figure 1The pilot head 5 is installed at the pilot valve port 106. The pilot head 5 is used to open and close the pilot valve port 106 so that the normally closed pressure port 101 is connected to or disconnected from the piston chamber 107, thereby driving the valve stem assembly 2 to move up and down.

[0057] In use, the normally closed pressure port 101 is connected to the air source, the normally open pressure port 102 is connected to the cylinder or diaphragm valve, and the exhaust port 103 is open to the atmosphere. When the pilot head 5 opens the pilot valve port 106, the medium at the normally open pressure port 102 enters the piston chamber 107 through the pressure-facing channel 108, the pilot valve port 106, and the pressure-inlet channel 109. Under the action of gas pressure, it overcomes the spring force of the valve stem spring 8 and pushes the valve stem assembly 2 to move downward. At this time, the first sealing structure 3 opens the first valve port 104 to connect the normally closed pressure port 101 and the normally open pressure port 102, and the second sealing structure 4 closes the second valve port 105 to isolate the normally open pressure port 102 from the exhaust port 103. The medium flows from the normally closed pressure port 101 to the normally open pressure port 102. When the pilot head 5 closes the pilot valve port 106, the medium at the normally closed pressure port 101 has nowhere to release pressure. Under the action of the pressure at the normally closed pressure port and the elastic force of the valve stem spring, the valve stem assembly moves upward. At this time, the first sealing structure 3 closes the first valve port 104 to isolate the normally closed pressure port 101 and the normally open pressure port 102, and the medium is disconnected. The second sealing structure 4 opens the second valve port 105 to connect the normally open pressure port 102 and the exhaust port 103. At this time, the medium in the normally open pressure port 102 flows to the exhaust port 103 through the second valve port 105.

[0058] Traditional solenoid valves are mostly low-inlet, high-outlet structures, while this product innovatively adopts a reverse-flow, high-inlet, low-outlet structure. The valve body is equipped with a pressure-facing channel, through which the pressure from the normally closed pressure port is introduced to the pilot valve port. This design simplifies the originally complex structure and effectively reduces the pressure directly acting on the first valve port. As a result, valve opening becomes easier and more convenient, especially in three-way solenoid valve applications under high-pressure environments, enabling the control of opening higher pressures with less force.

[0059] In some embodiments, such as Figure 1 as well as Figures 5 to 9 As shown, the first sealing structure 3 includes a sealing seat 31 mounted on the valve stem 21, a pressure plate 32 placed inside the sealing seat 31, and a sealing ring 33 installed between the sealing seat 31 and the pressure plate 32. A receiving space for installing the sealing ring 33 is formed between the sealing seat 31 and the pressure plate 32, wherein the valve stem, sealing seat, pressure plate, and sealing ring 33 are arranged coaxially. The pressure plate 32 is provided with a conical wall 321 on one side of the sealing ring 33, and the sealing seat 31 is provided with an arcuate groove 311 on the other side of the sealing ring 33. The sealing ring 33 is located between the conical wall and the arcuate groove.

[0060] Under normal conditions, one end of the sealing ring 33 protrudes from the upper surface of the sealing seat 31 and the pressure plate 32, allowing the wall of the first valve port 104 to press against the sealing ring when the valve stem assembly 2 moves. An arc-shaped gap cavity 34 is formed between the inner wall of the arc-shaped groove 311 and the sealing ring 33. When the wall of the first valve port 104 presses against the protruding part of the sealing ring 33 (the part protruding from the sealing seat and the pressure plate), the sealing ring 33 is deformed under pressure. The sealing interference of the sealing ring 33 just fills the arc-shaped gap cavity 34, resulting in a smooth seal and optimal sealing effect. In existing technologies, valve port seals are assembled using a compression method. The sealing interference lacks adequate space for release when the seal is deformed under compression, leading to a significantly shortened seal life and poor sealing performance. This first sealing structure solves the problem of significantly reduced seal life due to forced compression caused by the lack of release space for the sealing interference, effectively extending service life and ensuring sealing performance.

[0061] To simplify the structure and ensure a good seal, the second sealing structure 4 in this embodiment has the same structure as the first sealing structure 3. The second sealing structure 4 is connected to the piston 22, and its sealing seat can be integrally formed with the piston 22.

[0062] In some embodiments, such as Figures 6 to 9 As shown, a buffer zone 35 is formed between the conical wall 321, the sealing seat 31, and the sealing ring 33. The buffer zone and the arc-shaped gap cavity are respectively located on both sides of the sealing ring. The addition of the buffer zone 35 allows the sealing ring 33 to accommodate part of its deformation when it is compressed and deformed, further ensuring that the sealing interference is fully released. A convex ring 312 is integrally provided at one end of the sealing seat 31, and an arc-shaped groove 311 is provided inside the convex ring 312. The interior of the convex ring 312 is provided with a receiving groove 313 for accommodating the pressure plate 32.

[0063] In some embodiments, such as Figure 5 and Figure 6 As shown, both the pressure plate 32 and the sealing seat 31 are fitted onto the valve stem 21, and both the pressure plate 32 and the sealing seat 31 have through holes for the valve stem to pass through. The valve stem 21 expands to form a shoulder 23 on the side located on the pressure plate 32, and a fastening nut 24 is threadedly connected to the side of the valve stem 21 located on the sealing seat 31. The valve stem has a threaded rod that matches the fastening nut. When the fastening nut 24 is tightened, the shoulder 23, the pressure plate 32, and the sealing seat 31 are locked together under the tightening action of the fastening nut. The components are easy to assemble, and the connection is stable and reliable.

[0064] In some embodiments, such as Figure 1 and Figure 10As shown, the pilot head 5 includes a magnetic shielding tube assembly 51 threadedly connected to the valve body 1, a movable iron core 52 vertically mounted inside the magnetic shielding tube assembly 51, and an electromagnetic coil 53 sleeved on the magnetic shielding tube assembly 51. A pilot exhaust port 511 is provided inside the magnetic shielding tube assembly 51. The movable iron core 52 is positioned between the pilot valve port 106 and the pilot exhaust port 511, used to open or close the pilot exhaust port 511 and the pilot valve port 106. The pressure inlet channel 109 can communicate with the outside through the pilot exhaust port 511. The magnetic shielding tube assembly 51 and the electromagnetic coil 53 are existing technologies and will not be described in detail in this embodiment.

[0065] When the solenoid coil 53 is energized, the movable iron core 52 moves upward, opening the pilot valve port and closing the pilot exhaust port 511. At this time, the medium at the normally closed pressure port 101 can enter the piston chamber 107 through the pilot valve port 106. When the solenoid coil 53 is de-energized, the tower spring 54 causes the movable iron core 52 to move downward, closing the pilot valve port and opening the pilot exhaust port 511. At this time, the medium in the piston chamber 107 can be discharged to the outside through the pilot exhaust port 511, facilitating the reset of the valve stem assembly.

[0066] In some embodiments, such as Figures 10 to 13 As shown, the movable iron core 52 includes a movable iron core body 521 placed between the pilot valve port 106 and the pilot exhaust port 511, and an upper floating seal 522 and a lower floating seal 523 respectively installed at the upper and lower ends of the movable iron core body 521. The upper floating seal 522 is opposite to the pilot exhaust port 511 and is used to open and close the pilot exhaust port 511. The lower floating seal 523 is opposite to the pilot valve port 106 and is used to open and close the pilot valve port 106. An inner spring 524 is installed between the upper floating seal 522 and the lower floating seal 523. The inner spring 524 is placed inside the movable iron core body 521. By adding the inner spring, the two floating seals can slide up and down within a certain distance. When the seals are squeezed, the two floating seals can automatically adjust their positions within a certain range. The upper and lower ends of the movable iron core body 521 are respectively expanded outward to form a funnel-shaped expansion absorption area 525. The expansion absorption area 525 is used to absorb the deformation of the upper floating seal 522 and the lower floating seal 523, thereby releasing the deformation of the two floating seals, avoiding excessive compression of the seals, extending the service life of the seals, and ensuring the flatness of the sealing surface, thus improving the sealing effect.

[0067] In some embodiments, such as Figure 11 and Figure 12As shown, the movable iron core body has inlets at both its upper and lower ends, with expansion absorption zones located at these inlets. The outer diameter of the expansion absorption zone is larger than its inner diameter, facilitating the release of deformation from the two floating seals into the expansion absorption zone. The lower end of the movable iron core body 521 has a lower limit step 526 to restrict the lower floating seal 523 from detaching from the movable iron core body 521, and the upper end has an upper limit step 527 to restrict the upper floating seal 522 from detaching from the movable iron core body 521. This structure, through the lower and upper limit steps, limits the two floating seals, preventing them from detaching from the movable iron core body and ensuring effective operation.

[0068] In some embodiments, such as Figure 10 and Figure 11 As shown, a limiting flange 528 is provided at the lower end of the movable iron core body 521. A tower spring 54 is installed between the limiting flange 528 and the magnetic shielding tube assembly 51. The tower spring always causes the movable iron core body to tend to move downward. Multiple airflow channels 529 are provided on the movable iron core body 521. The pressure inlet channel 109 is connected to the pilot exhaust port 511 through the airflow channels 529.

[0069] In some embodiments, such as Figure 1 , Figure 10 , Figure 16 and Figure 17 As shown, a manual opening device 6 is installed inside the valve body 1. The manual opening device 6 is used to manually drive the movable iron core 52 when the electromagnetic coil 53 fails. The manual opening device 6 includes a sliding rod 61 that is slidably installed in the valve body 1 in the horizontal direction. One end of the sliding rod 61 extends to the lower side of the movable iron core 52, and a shovel-shaped part 611 is provided at the extended end of the sliding rod 61. When the electromagnetic coil 53 fails and manual opening is required, the sliding rod 61 is slid horizontally. The sliding rod 61 lifts the movable iron core 52 through the shovel-shaped part 611, causing the movable iron core 52 to disengage from the pilot valve port 106, thereby opening the pilot valve port.

[0070] A manual opening device is added so that the movable iron core can be driven manually when the electromagnetic coil fails. When driven manually, simply press the sliding rod, and the sliding rod will lift the movable iron core through the shovel-shaped part, thereby switching the state of the solenoid valve. The manual opening device has a simple structure and is easy to operate. Without affecting the electromagnetic control function of the pilot head, it also has the function of manual opening, which increases its functionality and makes it more reliable.

[0071] In some embodiments, such as Figure 10 , Figure 16 and Figure 17As shown, the shovel-shaped part 611 is provided with an inclined push wall 612 for lifting the movable iron core 52. The inclined push wall is used to lift the movable iron core. When the sliding rod is pressed, the sliding rod slides towards the movable iron core, and the inclined push wall abuts against the lower end of the movable iron core and squeezes the movable iron core, thereby lifting the movable iron core. This structure, with the inclined push wall, can convert the horizontal sliding of the sliding rod into the vertical sliding of the movable iron core, making the drive simple and reliable. The pilot valve port is provided to protrude upwards. The protruding pilot valve port leaves a gap 110 on the lower side of the movable iron core 52 when the pilot valve port is closed, and part of the shovel-shaped part 611 extends into the gap 110. This structure, with the gap 110 for the shovel-shaped part to extend into, facilitates the shovel-shaped part to scoop up the movable iron core when manually opened, making it convenient for the sliding rod to drive the movable iron core.

[0072] In some embodiments, such as Figure 10 , Figure 16 and Figure 17 As shown, a pressing head 613 is provided at one end of the sliding rod 61 outside the valve body 1 for easy pressing by the operator; during operation, pressing the pressing head 613 causes the sliding rod 61 to slide. A sliding rod spring 62 is installed between the pressing head 613 and the valve body 1, and the sliding rod spring 62 is used to reset the sliding rod 61. A limiting hole 614 is provided on the sliding rod 61, and a limiting pin 63 is vertically inserted into the valve body 1, with the limiting pin 63 passing through the limiting hole 614; wherein, the size of the limiting hole is larger than the size of the limiting pin, so that the sliding rod can slide relative to the limiting pin. The addition of the limiting pin can prevent the sliding rod from detaching from the valve body; through the cooperation of the limiting pin and the limiting hole, the sliding rod can be limited to the left and right, with good limiting effect.

[0073] In some embodiments, such as Figure 14 and Figure 15 As shown, a muffler 7 connected to the exhaust port 103 is installed on the valve body 1. During the switching of the valve stem assembly, the exhaust port is opened, which instantly generates a huge impact force and noise. To overcome this problem, a muffler 7 is added. The muffler 7 includes multiple vertically stacked sound-absorbing plates 71 and a sound-absorbing cover plate 72 at the top. Support bosses 711 are provided on the end faces of the sound-absorbing plates 71 and the sound-absorbing cover plate 72. Under the action of the support bosses 711, airflow gaps 73 are left between two adjacent sound-absorbing plates 71 and between the sound-absorbing plates 71 and the sound-absorbing cover plate 72 adjacent to the sound-absorbing cover plate 72. A central hole 712 is provided on the sound-absorbing plate 71. Multiple central holes are arranged coaxially. The diameter of the multiple central holes 712 gradually decreases from bottom to top. Multiple sound-absorbing plates and sound-absorbing cover plates are fixed by fastening screws. During the exhaust process, the gas enters from the bottom of the muffler. Multiple central holes allow for a buffering process in the exhaust, and the gas is eventually diverted and discharged from the airflow gaps. This not only ensures smooth exhaust but also significantly reduces the exhaust noise.

[0074] In some embodiments, such as Figure 1 , Figure 4 and Figure 5 As shown, a guide hole 111 is provided inside the valve body 1. The guide hole 111 is arranged coaxially with the piston chamber 107. A guide rod 25 adapted to the guide hole 111 is provided at the lower end of the valve stem 21. The guide hole 111 and the guide rod 25 cooperate to guide the raising and lowering of the valve stem 21, so that the valve stem 21 moves smoothly. A valve stem spring 8 is installed between the valve body 1 and the valve stem assembly 2. The valve stem spring 8 always makes the valve stem tend to move upward.

[0075] In this specification, the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the descriptions of the embodiments described later are relatively simple, and relevant parts can be referred to the descriptions of the foregoing embodiments.

[0076] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pilot-operated two-position three-way nuclear-grade high-flow solenoid valve, characterized in that, include: The valve body (1) is provided with a normally closed pressure port (101), a normally open pressure port (102), an exhaust port (103), a first valve port (104) for connecting the normally closed pressure port (101) and the normally open pressure port (102), a second valve port (105) for connecting the normally open pressure port (102) and the exhaust port (103), a pilot valve port (106), and a piston chamber (107). One end of the pilot valve port (106) is connected to the normally closed pressure port (101) through a pressure-facing channel (108), and the other end is connected to the piston chamber (107) through a pressure-inlet channel (109). The valve stem assembly (2) is vertically mounted in the valve body (1). It includes a valve stem (21), a piston (22) mounted on the valve stem (21), a first sealing structure (3), and a second sealing structure (4). The piston (22) is slidably mounted in the piston chamber (107). The first sealing structure (3) is used to open and close the first valve port (104), and the second sealing structure (4) is used to open and close the second valve port (105). A pilot head (5) is installed at the pilot valve port (106) to open and close the pilot valve port (106) so that the normally closed pressure port (101) is connected to or disconnected from the piston chamber (107), thereby driving the valve stem assembly (2) to move up and down.

2. The pilot-operated two-position three-way nuclear-grade high-flow solenoid valve according to claim 1, characterized in that: The first sealing structure (3) includes a sealing seat (31) mounted on the valve stem (21), a pressure plate (32) placed inside the sealing seat (31), and a sealing ring (33) mounted between the sealing seat (31) and the pressure plate (32). The pressure plate (32) has a tapered wall (321) on one side of the sealing ring (33), and the sealing seat (31) has an arc groove (311) on the other side of the sealing ring (33). Under normal conditions, one end of the sealing ring (33) protrudes from the end face of the sealing seat (31) and the pressure plate (32), and an arc-shaped gap cavity (34) is formed between the inner wall of the arc groove (311) and the sealing ring (33); when the wall of the first valve port (104) presses the protruding part of the sealing ring (33), the sealing ring (33) deforms and fills the arc-shaped gap cavity (34).

3. The pilot-operated two-position three-way nuclear-grade high-flow solenoid valve according to claim 2, characterized in that: A buffer zone (35) is formed between the conical wall (321), the sealing seat (31) and the sealing ring (33); a convex ring (312) is provided at one end of the sealing seat (31), the arc groove (311) is provided on the inner side of the convex ring (312), and a receiving groove (313) for accommodating the pressure plate (32) is provided inside the convex ring (312).

4. The pilot-operated two-position three-way nuclear-grade high-flow solenoid valve according to claim 2, characterized in that: The pressure plate (32) and the sealing seat (31) are both fitted onto the valve stem (21). The valve stem (21) has a shoulder (23) on one side of the pressure plate (32), and a fastening nut (24) is threaded onto one side of the valve stem (21) on the sealing seat (31). After tightening the fastening nut (24), the shoulder (23), the pressure plate (32), and the sealing seat (31) are locked together.

5. The pilot-operated two-position three-way nuclear-grade high-flow solenoid valve according to claim 1, characterized in that: The pilot head (5) includes a magnetic shielding tube assembly (51) threaded onto the valve body (1), a movable iron core (52) that can be lifted and installed inside the magnetic shielding tube assembly (51), and an electromagnetic coil (53). The magnetic shielding tube assembly (51) is provided with a pilot exhaust port (511), and the pressure inlet channel (109) can be connected to the outside through the pilot exhaust port (511). The movable iron core (52) includes a movable iron core body (521) placed between the pilot valve port (106) and the pilot exhaust port (511), and an upper floating seal (522) and a lower floating seal (523) respectively installed at the upper and lower ends of the movable iron core body (521). The upper floating seal (522) corresponds to the pilot exhaust port (511), and the lower floating seal (523) corresponds to the pilot valve port (106). An inner spring (524) is installed between the upper floating seal (522) and the lower floating seal (523). The upper and lower ends of the movable iron core body (521) are respectively expanded outward to form a trumpet-shaped expansion absorption area (525). The expansion absorption area (525) is used to absorb the deformation of the upper floating seal (522) and the lower floating seal (523).

6. The pilot-operated two-position three-way nuclear-grade high-flow solenoid valve according to claim 5, characterized in that: The lower end of the movable iron core body (521) is provided with a lower limit step (526) for limiting the lower floating seal (523) from coming out of the movable iron core body (521), and the upper end is provided with an upper limit step (527) for limiting the upper floating seal (522) from coming out of the movable iron core body (521). The lower end of the movable iron core body (521) is provided with a limiting flange (528), and a tower spring (54) is installed between the limiting flange (528) and the magnetic shielding tube assembly (51); the movable iron core body (521) is provided with multiple airflow channels (529), and the pressure inlet channel (109) is connected to the pilot exhaust port (511) through the airflow channel (529).

7. The pilot-operated two-position three-way nuclear-grade high-flow solenoid valve according to claim 5, characterized in that: The valve body (1) is equipped with a manual opening device (6) for manually driving the movable iron core (52) when the electromagnetic coil (53) fails. The manual opening device (6) includes a sliding rod (61) that is slidably installed in the valve body (1) in the horizontal direction. One end of the sliding rod (61) extends to the lower side of the movable iron core (52), and the extended end of the sliding rod (61) is provided with a shovel-shaped part (611). When manually opening, the sliding rod (61) is slid, and the movable iron core (52) is lifted by the shovel-shaped part (611) so that it is disengaged from the pilot valve port (106).

8. The pilot-operated two-position three-way nuclear-grade high-flow solenoid valve according to claim 7, characterized in that: The shovel-shaped part (611) is provided with an inclined push wall (612) for lifting the movable iron core (52), and a gap (110) is left on the lower side of the movable iron core (52), and the shovel-shaped part (611) extends into the gap (110). A pressing head (613) is provided at one end of the sliding rod (61) outside the valve body (1), and a sliding rod spring (62) is installed between the pressing head (613) and the valve body (1); a limiting hole (614) is provided on the sliding rod (61), and a limiting pin (63) is vertically inserted on the valve body (1), and the limiting pin (63) passes through the limiting hole (614).

9. The pilot-operated two-position three-way nuclear-grade high-flow solenoid valve according to claim 1, characterized in that: The valve body (1) is equipped with a muffler (7) that communicates with the exhaust port (103); the muffler (7) includes a plurality of vertically stacked muffler plates (71) and a muffler cover plate (72) at the top. Support bosses (711) are provided on the end faces of the muffler plates (71) and the muffler cover plate (72). The support bosses (711) allow airflow gaps (73) to be left between two adjacent muffler plates (71) and between the muffler plates (71) and the muffler cover plate (72); the muffler plates (71) are provided with central holes (712), and the diameter of the plurality of central holes (712) gradually decreases from bottom to top.

10. The pilot-operated two-position three-way nuclear-grade high-flow solenoid valve according to claim 1, characterized in that: The valve body (1) is provided with a guide hole (111), which is arranged coaxially with the piston chamber (107). The lower end of the valve stem (21) is provided with a guide rod (25) adapted to the guide hole (111). A valve stem spring (8) is installed between the valve body (1) and the valve stem assembly (2).

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