A high temperature and high pressure totally enclosed blind plate valve with harmful gas medium pipeline control

Abstract

The application discloses a high-temperature and high-pressure fully-closed blind plate valve with harmful gas medium pipeline control, and belongs to the blind plate valve field. The high-temperature and high-pressure fully-closed blind plate valve with harmful gas medium pipeline control comprises two annular rings which are symmetrically arranged with a square plate as the center, a middle ring is arranged at the round hole of the square plate, a ring groove is formed in the outer side of the middle ring, the ring groove completely penetrates the middle ring and the square plate along the axial direction, and a limiting block is fixedly connected to the side of the annular ring close to the middle ring. The problems of low assembly precision of the bolt fixing frame body and easy dislocation are solved. The ring groove and the limiting block are in concave-convex engagement clamping cooperation. Under the high-temperature thermal expansion or high-pressure medium impact, the engagement structure can resist the axial and radial forces, prevents the frame body components from loosening and separating, realizes the precise positioning of the clamping guide fitting structure, and avoids the problem of the leakage gap caused by the dislocation of the sealing surface.

Description

Technical Field

[0001] This invention relates to a high-temperature, high-pressure, fully enclosed blind valve for controlling pipelines carrying harmful gas media, and pertains to the field of blind valves. Background Technology

[0002] Blind plate valves, as core control devices for media on / off switching and pipeline isolation in pipeline transportation systems, are widely used in industrial fields such as chemical, metallurgical, power, and coal chemical industries where hazardous gas media are transported. Especially in hazardous gas pipelines operating under high temperature and high pressure conditions, their sealing performance, structural stability, and impact resistance directly affect production safety, equipment operating efficiency, and environmental protection. In high-temperature and high-pressure hazardous gas media pipeline applications, the media are often corrosive, toxic, flammable, and explosive, and the pipelines are constantly subjected to temperatures of hundreds of degrees Celsius and pressures of several megapascals. This places extremely high demands on the structural design, assembly precision, sealing protection, and resistance to thermal expansion and deformation of blind plate valves.

[0003] In the prior art, such as the sector-shaped blind valve with a top-opening clamping device in patent number CN117072693B, the support rod on the connecting rod is rotated by twisting the connecting rod, thereby opening the first valve body and the second valve body of the clamping valve plate, which facilitates the operation of the blind valve. However, traditional blind valves often use bolts to fix the valve plate frame. In high-temperature environments, bolts are prone to loosening and relative displacement of the frame components. At the same time, bolt fixing can easily cause misalignment of the frame components, resulting in inaccurate sealing surface fit and leakage gaps. Furthermore, under the continuous axial impact of high-temperature, high-pressure, and harmful gas media, the valve plate is prone to slippage and misalignment, making it impossible to stably maintain the conduction or cut-off position. Summary of the Invention

[0004] To address the aforementioned problems, this invention discloses a high-temperature, high-pressure, fully enclosed blind flange valve for controlling hazardous gas media pipelines. The valve includes a housing and a base fixedly installed at the bottom of the housing. Two valve bodies are fixedly connected inside the housing, symmetrically arranged within the housing. A protective shell is fixedly connected to the side of the housing. A drive component is externally connected to the outer side of the protective shell, with its output end penetrating the protective shell and extending inwards to be fixedly connected to the side plate of a square plate. Two protective shells are symmetrically arranged on both sides of the housing. A cooling pipe is fixedly connected inside the housing. The cooling pipes at the upper and lower ends of the valve body form a symmetrical cooling structure, which achieves all-round uniform cooling of the valve body, valve plate and frame area. This prevents the elastic ring from aging, softening or losing elasticity due to high temperature, and ensures that it can maintain good elastic deformation ability under compression, so as to achieve reliable sealing. In addition, uniform cooling can prevent the valve body, square plate, intermediate ring and other sealing mating parts from deforming due to high temperature thermal expansion, avoid misalignment of sealing surface and large gap, and ensure that the elastic ring can be in close contact with the mating surface when compressed, without gap leakage, and ensure the effectiveness of compression sealing. There are two cooling pipes, which are symmetrically arranged above and below the valve body. The valve plate is fixedly installed inside the middle of the housing, and the valve plate is located in the gap between the two valve bodies. The valve plate includes a guide rod, a square plate is slidably connected to the outside of the guide rod, a positioning groove is provided on the protrusion of the square plate near the middle ring, there are two square plates, a round hole is provided in the middle of the square plate, and a frame is provided on the inner wall of the square plate. The frame includes two rings symmetrically arranged around a square plate. An intermediate ring is located at the circular hole of the square plate. Two elastic rings are embedded into the limiting grooves of the two intermediate rings, completing the pre-assembly of the elastic seals. Then, the two intermediate rings with elastic rings are inserted from both sides of the circular hole in the square plate, so that the protrusions of the intermediate rings engage with the positioning grooves of the square plate, ensuring that the annular grooves are axially connected on the square plate. The two rings with limiting blocks are aligned with the annular grooves of the intermediate rings from the top and bottom, allowing the limiting blocks to slide completely into the annular grooves. This causes the two rings on both sides of the square plate to rotate relative to each other. At this point, the inclined arc-shaped contact of the two limiting blocks is reached. The frame is installed on the square plate by compression. Finally, the two ends of the intermediate part are fixedly connected to the inner sides of the two circular rings on the frame, completing the overall assembly of the frame and the intermediate part. The ring groove and the limiting block are engaged by a convex-concave interlocking fit. Under the impact of high temperature thermal expansion or high pressure medium, the interlocking structure can resist the axial and radial forces, prevent the frame parts from loosening or separating, and make the frame stably embedded in the circular hole of the square plate. This ensures that the elastic ring can be compressed to achieve effective sealing. The outer side of the intermediate ring has a ring groove that completely penetrates the intermediate ring and the square plate along the axial direction. The side of the circular ring closest to the intermediate ring is fixedly connected to a limiting block, which is located inside the ring groove.

[0005] Furthermore, there are two guide rods, symmetrically arranged at both ends of the square plate. The square plate has through holes along the direction of the guide rods, with the guide rods located inside the through holes. The outer side of the square plate has slots. The high-temperature and high-pressure medium will continuously impact the valve plate. The rigid engagement of the locking block with the slots forms a mechanical lock, achieving precise mechanical locking of the valve plate in the on and off positions. This effectively counteracts the continuous impact of the high-temperature and high-pressure medium on the valve plate, preventing the valve plate from slipping or misaligning. It ensures that the round hole of the square plate is precisely aligned with the flow channel of the valve body when the valve is on, and that the solid area completely blocks the flow channel when the valve is off. This improves the stability and sealing of the on / off switching, adapts to the structural strength requirements under high-pressure conditions, ensures stable on / off states, and avoids leakage of sealing gaps and medium due to valve body loosening. There are four slots, evenly distributed around the round hole. An intermediate component is fixedly connected inside the frame, with one intermediate component.

[0006] Furthermore, there are two intermediate rings, symmetrically arranged around the square plate. A protrusion is fixedly connected to the side of each intermediate ring closest to the square plate. Multiple protrusions are evenly distributed around the intermediate ring. The limiting blocks on the two rings are arranged in an inclined arc shape on opposite sides. A limiting groove is formed on the side of the intermediate ring closest to the square plate. An elastic ring is provided at the gap between the intermediate ring and the square plate. The frame adopts a dual structure of elastic ring sealing and intermediate component elastic compensation sealing, combined with the rigid seal of the valve body end sealing ring, forming triple sealing protection. The sliding fit between the limiting block and the ring groove allows the intermediate ring to move slightly axially with the extrusion force. The elastic ring is fully filled by compression. The compression spring and elastic plate of the intermediate component compensate for the small gaps in the sealing surface processing and assembly through elastic deformation. The multiple sealing structures work together to maintain a tight seal even under high-pressure medium impact, achieving zero leakage of harmful gas media. There are two elastic rings, symmetrically arranged around the square plate, located inside the limiting groove.

[0007] Furthermore, the intermediate component includes two circular plates, which are fixedly connected to two circular rings. An elastic plate is fixedly connected to the space between the two circular plates, with both ends of the elastic plate fixedly connected to the two circular plates respectively. A compression spring is fixedly connected to the middle of the opposite sides of the two circular plates. The compression spring and elastic plate of the intermediate component have good elastic deformation capability. When subjected to the pressure of the pressure plate, they undergo compression deformation, using the rebound force to push the two side rings and the intermediate ring towards the valve body side. This precisely compensates for the tiny gaps in the sealing surface caused by processing, assembly errors, or high-temperature thermal expansion, ensuring that the elastic ring is always tightly pressed against the contact surface, preventing high-pressure harmful gases from leaking out through the gaps. To achieve zero-leakage sealing, multiple concentric connecting rings and evenly distributed intermediate plates in the intermediate components form a rigid support skeleton. Combined with the axial impact resistance of the compression spring, this effectively enhances the overall pressure resistance of the frame structure inside the valve plate, resists the axial impact of high-pressure media on the sealing structure, and prevents excessive displacement or deformation of the circular ring and intermediate ring due to high pressure, ensuring the integrity of the sealing structure. An intermediate plate is fixedly connected to the side of the circular plate near the elastic plate, and a connecting ring is fixedly connected to the outside of the intermediate plate. There are multiple connecting rings, which are concentrically arranged. There are also multiple intermediate plates, which are evenly distributed on the circular plate.

[0008] Furthermore, the housing includes an outer shell, with a side hole on the outer side that extends through the outer shell along the direction of the guide rod. A hydraulic cylinder is fixedly connected to the inner wall of the outer shell, and a movable plate is fixedly connected to the output end of the hydraulic cylinder. A locking block is fixedly connected to the corner of the movable plate, and the locking block is located inside the slot.

[0009] Furthermore, the valve body includes a cylindrical body, which is fixedly connected to the outer shell. The cylindrical body penetrates the outer shell and extends to the outside of the outer shell. A flange is fixedly connected to the end of the cylindrical body, and the flange is located outside the outer shell. A sliding groove is formed on the outer side of the cylindrical body, and a moving plate is slidably connected to the cylindrical body through the sliding groove. A through groove is formed on the end face of the cylindrical body away from the flange. A pressure plate is slidably connected to the inner wall of the through groove, and a return spring is fixedly connected to the inner wall of the through groove. The end of the return spring away from the through groove is fixedly connected to the pressure plate. The pressing force of the pressure plate on the valve body is transmitted to the inside of the valve body, pushing the two middle rings on both sides to move slightly towards the circular direction, thus limiting the movement. The block slides axially within the annular groove. The elastic ring is further compacted by the pressure of the square plate and the intermediate ring, filling the gap and forming an elastic seal. At the same time, the extrusion force pushes the circular ring towards the middle part. The compression spring and elastic plate are compressed and undergo elastic deformation. The rebound force pushes the circular ring and the intermediate ring towards the valve body side to compensate for the small gaps in the sealing surface and achieve zero-leakage elastic compensation seal. An extension block is fixedly connected to the outside of the pressure plate. There are multiple extension blocks, which are evenly distributed on the pressure plate. A sealing ring is set on the side of the pressure plate away from the return spring. The extension blocks are located inside the slide groove.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: (i) The high-temperature and high-pressure fully enclosed blind plate valve for controlling harmful gas medium pipelines has a snap-fit ​​engagement between the annular groove and the limiting block. This engagement structure can resist axial and radial forces under high temperature thermal expansion or high pressure medium impact, preventing the components of the frame from loosening or separating. This ensures that the frame is stably embedded in the round hole of the square plate, and that the elastic ring can be compressed to achieve effective sealing.

[0011] (II) The high-temperature and high-pressure fully enclosed blind plate valve for controlling the pipeline of harmful gas medium has a mechanical lock formed by the rigid engagement of the locking block and the slot, which realizes the precise mechanical locking of the valve plate in the conduction position and the cut-off position. It can effectively counteract the continuous impact of high-temperature and high-pressure medium on the valve plate, prevent the valve plate from slipping or misaligning, and ensure that the square plate round hole and the valve body flow channel are precisely aligned when conducting.

[0012] (III) This high-temperature and high-pressure fully enclosed blind plate valve for controlling harmful gas media pipelines achieves a dual structure of elastic ring sealing and intermediate elastic compensation sealing in the frame body. Combined with the hard sealing of the valve body end sealing ring, it forms a triple sealing protection. The sliding fit between the limiting block and the ring groove allows the intermediate ring to move slightly axially with the extrusion force. The elastic ring is fully filled by the extrusion. The compression spring and elastic plate of the intermediate part compensate for the small gaps in the sealing surface processing and assembly through elastic deformation.

[0013] (iv) The high-temperature and high-pressure fully enclosed blind plate valve for controlling harmful gas medium pipelines realizes that multiple sets of concentric connecting rings and uniformly distributed intermediate plates in the intermediate parts form a rigid support skeleton. Combined with the axial impact resistance of the compression spring, it effectively enhances the overall pressure resistance of the frame structure inside the valve plate, resists the axial impact of high pressure medium on the sealing structure, prevents the ring and intermediate ring from excessive displacement or deformation due to high pressure, and ensures the integrity of the sealing structure. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a partial cross-sectional structural schematic diagram of the present invention; Figure 3 This is a partial structural schematic diagram of the present invention; Figure 4 This is a schematic diagram of the valve plate of the present invention; Figure 5 This is a partial cross-sectional view of the valve plate of the present invention. Figure 6 For the present invention Figure 5 A structural schematic diagram of the enlarged view at point A in the middle; Figure 7 This is a schematic diagram of the structure of the intermediate ring of the present invention; Figure 8 This is a schematic diagram of the structure of the ring of the present invention; Figure 9 This is a schematic diagram of the structure of the middleware of the present invention; Figure 10 This is a schematic diagram of the structure of the housing of the present invention; Figure 11 This is a cross-sectional structural schematic diagram of the housing of the present invention; Figure 12 This is a cross-sectional structural schematic diagram of the cylindrical body of the present invention.

[0015] In the diagram: 1. Base; 2. Housing; 21. Outer shell; 22. Side hole; 23. Hydraulic cylinder; 24. Moving plate; 25. Clamping block; 3. Valve body; 31. Cylinder; 32. Slide groove; 33. Flange; 34. Pressure plate; 35. Extension block; 36. Sealing ring; 37. Through groove; 38. Return spring; 4. Valve plate; 41. Guide rod; 42. Square plate; 43. Groove; 44. Frame; 441. Circular ring; 442. Intermediate ring; 443. Elastic ring; 444. Circular groove; 445. Protrusion; 446. Limiting block; 45. Intermediate component; 451. Circular plate; 452. Elastic plate; 453. Intermediate plate; 454. Connecting ring; 455. Compression spring; 46. Through hole; 5. Cooling pipe; 6. Protective shell. Detailed Implementation

[0016] Example 1, as Figures 1 to 8 As shown, this embodiment discloses a high-temperature and high-pressure fully enclosed blind valve for controlling a hazardous gas medium pipeline, including a housing 2 and a base 1 fixedly installed at the bottom of the housing 2. A valve body 3 is fixedly connected inside the housing 2. There are two valve bodies 3, symmetrically arranged inside the housing 2. A protective shell 6 is fixedly connected to the side of the housing 2. A drive component is externally connected to the outside of the protective shell 6. The output end of the drive component penetrates the protective shell 6 and extends into the interior, where it is fixedly connected to the side plate of a square plate 42. There are two protective shells 6, symmetrically arranged on both sides of the housing 2. A cooling pipe 5 is fixedly connected inside the housing 2. The valve bodies 3 are positioned vertically and horizontally. The cooling pipes 5 at the ends form a symmetrical cooling structure, which can achieve all-round uniform cooling of the valve body 3, valve plate 4 and frame 44 area, avoid the elastic ring 443 from aging, softening or losing elasticity due to high temperature, and ensure that it can still maintain good elastic deformation ability under compression, so as to achieve reliable sealing. In addition, uniform cooling can prevent the sealing mating parts such as valve body 3, square plate 42, and intermediate ring 442 from thermal expansion and deformation due to high temperature, avoid misalignment of sealing surface and large gap, and ensure that the elastic ring 443 can be in close contact with the mating surface when compressed, without gap leakage, and ensure the effectiveness of compression sealing. There are two cooling pipes 5, and the two cooling pipes 5 are symmetrically arranged above and below the valve body 3. Valve plate 4 is fixedly installed in the middle of the inside of housing 2, and the valve plate 4 is located in the gap between the two valve bodies 3. Among them, the valve plate 4 includes a guide rod 41, a square plate 42 is slidably connected to the outside of the guide rod 41, a positioning groove is provided on the protrusion 445 of the square plate 42 near the middle ring 442, there are two square plates 42, a round hole is provided in the middle of the square plate 42, and a frame 44 is provided on the inner wall of the square plate 42. The frame 44 includes two circular rings 441, symmetrically arranged around the square plate 42. An intermediate ring 442 is provided at the circular hole of the square plate 42. Two elastic rings 443 are respectively embedded into the limiting grooves of the two intermediate rings 442, completing the pre-assembly of the elastic seal. Then, the two intermediate rings 442 with elastic rings 443 are respectively embedded from both sides of the circular hole of the square plate 42, so that the protrusions 445 of the intermediate rings 442 engage with the positioning grooves of the square plate 42, ensuring that the annular grooves 444 are axially connected on the square plate 42. The two circular rings 441 with limiting blocks 446 are aligned with the annular grooves 444 of the intermediate rings 442 from the top and bottom, so that the limiting blocks 446 slide completely into the annular grooves 444. The two rings 441 on both sides of the square plate 42 rotate relative to each other. At this time, the inclined arc of the two limiting blocks 446 contacts and presses against each other, so that the frame 44 is installed on the square plate 42. Finally, the two ends of the intermediate part 45 are fixedly connected to the inner side of the two rings 441 on the frame 44, completing the overall assembly of the frame 44 and the intermediate part 45, so that the frame 44 is stably embedded in the round hole of the square plate 42, ensuring that the elastic ring 443 can be compressed to achieve effective sealing. The outer side of the intermediate ring 442 is provided with an annular groove 444, which completely penetrates the intermediate ring 442 and the square plate 42 along the axial direction. The side of the ring 441 near the intermediate ring 442 is fixedly connected to the limiting block 446, which is located inside the annular groove 444.

[0017] There are two guide rods 41, which are symmetrically arranged at both ends of the square plate 42. The square plate 42 has through holes 46 along the direction of the guide rods 41. The guide rods 41 are located inside the through holes 46. The outer side of the square plate 42 has a slot 43. The high temperature and high pressure medium will continuously impact the valve plate 4. The rigid engagement of the locking block 25 with the slot 43 forms a mechanical lock, realizing the precise mechanical locking of the valve plate 4 in the conduction position and the cut-off position. It can effectively offset the continuous impact of the high temperature and high pressure medium on the valve plate 4, prevent the valve plate 4 from slipping or misaligning, and ensure that the round hole of the square plate 42 is precisely aligned with the flow channel of the valve body 3 when conducting. When cutting off, the solid area completely blocks the flow channel, improving the stability and sealing of the on / off switching, adapting to the structural strength requirements under high pressure conditions, ensuring the stability of the on / off state, and avoiding sealing gaps and medium leakage due to loosening of the valve body 3. There are four slots 43, which are evenly distributed around the round hole. There is one intermediate part 45 fixedly connected inside the frame 44.

[0018] There are two intermediate rings 442, symmetrically arranged around the square plate 42. A protrusion 445 is fixedly connected to the side of each intermediate ring 442 near the square plate 42. Multiple protrusions 445 are evenly distributed around the intermediate ring 442. The limiting blocks 446 on the two rings 441 are arranged in an inclined arc shape on opposite sides. A limiting groove is formed on the side of the intermediate ring 442 near the square plate 42. An elastic ring 443 is provided at the interval between the intermediate ring 442 and the square plate 42. The frame 44 adopts a dual structure of sealing with the elastic ring 443 and elastic compensation sealing with the intermediate component 45, in conjunction with... The rigid seals of the three end sealing rings of the valve body form a triple sealing protection. The sliding fit between the limiting block 446 and the ring groove 444 allows the intermediate ring 442 to move slightly axially with the extrusion force. The elastic ring 443 is fully filled by the extrusion force. The compression spring 455 and the elastic plate 452 of the intermediate part 45 compensate for the small gaps in the processing and assembly of the sealing surface through elastic deformation. The multiple sealing structures work together to maintain a tight fit of the sealing surface under the impact of high pressure medium, achieving zero leakage of harmful gas medium. There are two elastic rings 443, which are symmetrically arranged with the square plate 42 as the center. The elastic rings 443 are located inside the limiting groove.

[0019] Example 2, based on Example 1, combined with... Figure 9 Therefore, the intermediate component 45 includes a circular plate 451, which is fixedly connected to a circular ring 441. There are two circular plates 451, and an elastic plate 452 is fixedly connected at the interval between the two circular plates 451. The two ends of the elastic plate 452 are fixedly connected to the two circular plates 451 respectively. A compression spring 455 is fixedly connected to the middle of the opposite side of the two circular plates 451. The compression spring 455 and the elastic plate 452 of the intermediate component have good elastic deformation ability. When subjected to the pressure of the pressure plate, they undergo compression deformation. The rebound force pushes the two circular rings 441 and the intermediate ring 442 towards the valve body side, accurately compensating for the small gaps caused by processing, assembly errors or high temperature thermal expansion of the sealing surface. This ensures that the elastic ring 443 is always tightly pressed against the contact surface, preventing high-pressure harmful gases from leaking from the gaps. To achieve zero-leakage sealing, multiple concentric connecting rings 454 of the intermediate component 45 and the evenly distributed intermediate plates 453 form a rigid support skeleton. Combined with the axial impact resistance of the compression spring 455, this effectively enhances the overall pressure resistance of the frame structure 44 inside the valve plate 4, resists the axial impact of high-pressure media on the sealing structure, and prevents excessive displacement or deformation of the circular ring 441 and intermediate ring 442 due to high pressure, thus ensuring the integrity of the sealing structure. The intermediate plate 453 is fixedly connected to the side of the circular plate 451 near the elastic plate 452, and connecting rings 454 are fixedly connected to the outer side of the intermediate plate 453. There are multiple connecting rings 454, which are concentrically arranged. There are also multiple intermediate plates 453, which are evenly distributed on the circular plate 451.

[0020] Example 3, based on Examples 1 and 2, combined with... Figures 10 to 12 It can be seen that the housing 2 includes an outer shell 21, and a side hole 22 is provided on the outer side of the outer shell 21. The side hole 22 penetrates the outer shell 21 along the direction of the guide rod 41. A hydraulic cylinder 23 is fixedly connected to the inner wall of the outer shell 21. A moving plate 24 is fixedly connected to the output end of the hydraulic cylinder 23. A locking block 25 is fixedly connected to the corner of the moving plate 24. The locking block 25 is located inside the slot 43.

[0021] The valve body 3 includes a cylindrical body 31, which is fixedly connected to the outer shell 21. The cylindrical body 31 penetrates the outer shell 21 and extends to the outside of the outer shell 21. A flange 33 is fixedly connected to the end of the cylindrical body 31, and the flange 33 is located outside the outer shell 21. A sliding groove 32 is provided on the outer side of the cylindrical body 31. A moving plate 24 is slidably connected to the cylindrical body 31 through the sliding groove 32. A through groove 37 is provided on the end face of the cylindrical body 31 away from the flange 33. A pressure plate 34 is slidably connected to the inner wall of the through groove 37. A return spring 38 is fixedly connected to the inner wall of the through groove 37. The end of the return spring 38 away from the through groove 37 is fixedly connected to the pressure plate 34. The squeezing force of the pressure plate 34 on the valve body 3 is transmitted to the inside of the valve body 3, pushing the two intermediate rings 442 on both sides to move slightly towards the circular ring 441. The limiting block 446 slides axially within the annular groove 444. The elastic ring 443 is further compacted by the squeezing of the square plate 42 and the intermediate ring 442, filling the gap and forming an elastic seal. At the same time, the squeezing force pushes the circular ring 441 to move towards the intermediate part 45. The compression spring 455 and the elastic plate 452 are squeezed and undergo elastic deformation. The rebound force pushes the circular ring 441 and the intermediate ring 442 to the valve body 3 side to compensate for the small gaps in the sealing surface and achieve zero-leakage elastic compensation seal. An extension block 35 is fixedly connected to the outside of the pressure plate 34. There are multiple extension blocks 35, which are evenly distributed on the pressure plate 34. A sealing ring 36 is provided on the side of the pressure plate 34 away from the return spring 38. The extension blocks 35 are located inside the slide groove 32.

[0022] When in use, the hydraulic cylinder 23 is activated. The output end of the hydraulic cylinder 23 drives the moving plate 24 to slide horizontally away from the valve plate 4. The locking block 25 on the moving plate 24 is completely disengaged from the slot 43 of the square plate 42, releasing the position fixation of the valve plate 4. At the same time, the moving plate 24 slides in the slide groove 32 of the cylinder 31, driving the extension block 35 on the pressure plate 34 to move synchronously. The pressure plate 34 is pulled and compresses the reset spring 38, and the sealing ring 36 separates from the end face of the valve plate 4, releasing the hard seal at the end of the valve body 3.

[0023] Subsequently, the driving component pushes the square plate 42 to slide along the guide rod 41, causing the square plate 42 to move the intermediate component 45, so that the solid area of ​​the valve body 3 is accurately moved between the cylinder 31 flow channel of the two valve bodies 3, completely blocking the medium channel and realizing the physical isolation of the pipeline. During the sliding process, a uniform speed must be maintained to avoid the limit block 446 from getting stuck with the annular groove 444.

[0024] Restart the hydraulic cylinder 23. The hydraulic cylinder 23 drives the moving plate 24 to reset and fit against the valve plate 4. The locking block 25 is re-embedded into the slot 43, completing the fixation of the valve plate 4 at the cut-off position. At the same time, the moving plate 24 pushes the extension block 35 to reset. The reset spring 38 extends naturally, pushing the pressure plate 34 to move towards the valve plate 4. The sealing ring 36 fits tightly against the end face of the valve plate 4 again, restoring the hard seal at the end of the valve body 3.

Claims

1. A high-temperature, high-pressure, fully enclosed blind valve for controlling harmful gas media pipelines, characterized in that: Includes a housing (2) and a base (1) fixedly installed at the bottom of the housing (2). A valve body (3) is fixedly connected inside the housing (2). There are two valve bodies (3), which are symmetrically arranged inside the housing (2). A protective shell (6) is fixedly connected to the side of the housing (2). Valve plate (4), the valve plate (4) is fixedly installed in the middle of the inside of the housing (2), the valve plate (4) is located in the gap between the two valve bodies (3); The valve plate (4) includes a guide rod (41), and a square plate (42) is slidably connected to the outside of the guide rod (41). There are two square plates (42). A round hole is opened in the middle of the square plate (42), and a frame (44) is provided on the inner wall of the square plate (42). The frame (44) includes two rings (441). The two rings (441) are symmetrically arranged with the square plate (42) as the center. An intermediate ring (442) is provided at the circular hole of the square plate (42). An annular groove (444) is provided on the outer side of the intermediate ring (442). The annular groove (444) completely penetrates the intermediate ring (442) and the square plate (42) along the axial direction. A limiting block (446) is fixedly connected to the side of the ring (441) near the intermediate ring (442). The limiting block (446) is located inside the annular groove (444).

2. The high-temperature and high-pressure fully enclosed blind valve for controlling harmful gas medium pipelines according to claim 1, characterized in that: There are two protective shells (6), and the two protective shells (6) are symmetrically arranged on both sides of the shell (2) as the center. The shell (2) is fixedly connected with a cooling pipe (5), and there are two cooling pipes (5), which are symmetrically arranged vertically with the valve body (3) as the center.

3. The high-temperature and high-pressure fully enclosed blind valve for controlling harmful gas medium pipelines according to claim 1, characterized in that: There are two guide rods (41), which are symmetrically arranged at both ends of the square plate (42). The square plate (42) has through holes (46) along the direction of the guide rods (41). The guide rods (41) are located inside the through holes (46). There are four slots (43) on the outer side of the square plate (42). The four slots (43) are evenly distributed around the round hole. There is one intermediate component (45) fixedly connected inside the frame (44).

4. The high-temperature and high-pressure fully enclosed blind valve for controlling hazardous gas media pipelines according to claim 1, characterized in that: There are two intermediate rings (442), and the two intermediate rings (442) are symmetrically arranged with the square plate (42) as the center. A protrusion (445) is fixedly connected to the side of the intermediate ring (442) near the square plate (42). There are multiple protrusions (445), and the multiple protrusions (445) are evenly distributed with the intermediate ring (442) as the center. The limiting blocks (446) on the two rings (441) are arranged in an inclined arc shape on opposite sides.

5. A high-temperature, high-pressure, fully enclosed blind valve for controlling hazardous gas media pipelines according to claim 4, characterized in that: The intermediate ring (442) has a limiting groove on the side near the square plate (42). An elastic ring (443) is provided at the interval between the intermediate ring (442) and the square plate (42). There are two elastic rings (443), which are symmetrically arranged with the square plate (42) as the center. The elastic rings (443) are located inside the limiting groove.

6. A high-temperature, high-pressure, fully enclosed blind valve for controlling hazardous gas media pipelines according to claim 3, characterized in that: The intermediate component (45) includes a circular plate (451), which is fixedly connected to a ring (441). There are two circular plates (451), and an elastic plate (452) is fixedly connected at the interval between the two circular plates (451). The two ends of the elastic plate (452) are fixedly connected to the two circular plates (451) respectively. A compression spring (455) is fixedly connected to the middle of the opposite side of the two circular plates (451).

7. A high-temperature, high-pressure, fully enclosed blind valve for controlling hazardous gas media pipelines according to claim 6, characterized in that: A middle plate (453) is fixedly connected to the side of the circular plate (451) near the elastic plate (452). A connecting ring (454) is fixedly connected to the outer side of the middle plate (453). There are multiple connecting rings (454), which are concentrically arranged. There are multiple middle plates (453), which are evenly distributed on the circular plate (451).

8. A high-temperature, high-pressure, fully enclosed blind valve for controlling hazardous gas media pipelines according to claim 1, characterized in that: The housing (2) includes an outer shell (21), and a side hole (22) is provided on the outer side of the outer shell (21). The side hole (22) passes through the outer shell (21) along the direction of the guide rod (41). A hydraulic cylinder (23) is fixedly connected to the inner wall of the outer shell (21). A moving plate (24) is fixedly connected to the output end of the hydraulic cylinder (23). A locking block (25) is fixedly connected to the corner of the moving plate (24). The locking block (25) is located inside the slot (43).

9. A high-temperature, high-pressure, fully enclosed blind valve for controlling hazardous gas media pipelines according to claim 8, characterized in that: The valve body (3) includes a cylinder (31), which is fixedly connected to the outer shell (21). The cylinder (31) penetrates the outer shell (21) and extends to the outside of the outer shell (21). A flange (33) is fixedly connected to the end of the cylinder (31). The flange (33) is located outside the outer shell (21). A sliding groove (32) is provided on the outer side of the cylinder (31). The moving plate (24) is slidably connected to the cylinder (31) through the sliding groove (32). A through groove (37) is provided on the end face of the cylinder (31) away from the flange (33).

10. A high-temperature, high-pressure, fully enclosed blind valve for controlling hazardous gas media pipelines according to claim 9, characterized in that: A pressure plate (34) is slidably connected to the inner wall of the through groove (37), and a return spring (38) is fixedly connected to the inner wall of the through groove (37). The end of the return spring (38) away from the through groove (37) is fixedly connected to the pressure plate (34). An extension block (35) is fixedly connected to the outer side of the pressure plate (34). There are multiple extension blocks (35), which are evenly distributed on the pressure plate (34). A sealing ring (36) is provided on the side of the pressure plate (34) away from the return spring (38). The extension block (35) is located inside the slide groove (32).

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