A center type screw type butterfly valve

Abstract

The application discloses a center type spiral butterfly valve, and relates to the application field of butterfly valves. The center type spiral butterfly valve comprises external connecting pipelines I and II, a center type butterfly valve is arranged between the external connecting pipelines I and II, an extension sleeve is arranged on one side of the center type butterfly valve, a bolt assembly is rotatably connected to the side of the extension sleeve, the bolt assembly extends into the extension sleeve, a pressing plate is movably arranged in the extension sleeve, the pressing plate is in threaded connection with the bolt assembly, a sealing assembly is movably arranged in the extension sleeve, and rotating the bolt assembly drives the pressing plate to move, so that the sealing assembly is pushed to abut against the flange plate of the external connecting pipeline II, and then the center type butterfly valve, the extension sleeve and the external connecting pipeline II are sealingly connected. The extension sleeve, the bolt assembly, the pressing plate and the sealing assembly arranged on one side of the center type butterfly valve can actively adapt to a gap of a certain size when the butterfly valve is installed, and the pressing plate can push the sealing assembly to actively abut against the flange plate of a pipeline system.

Description

TECHNICAL FIELD

[0001] The application relates to the field of butterfly valves, and particularly relates to a center type spiral butterfly valve. BACKGROUND

[0002] A pipeline valve is a mechanical device installed in a pipeline system for controlling the flow state of a fluid (liquid, gas, steam, slurry, etc.), and the valve realizes the regulation of the fluid in the pipeline by changing the on-off or the size of the cross-sectional area of the internal passage. There are various types of valves, such as valve, ball valve, stop valve, butterfly valve, check valve, safety valve and regulating valve. The butterfly valve can be divided into center butterfly valve, single eccentric butterfly valve, double eccentric butterfly valve and triple eccentric butterfly valve. The center butterfly valve is a valve in which the axis of the valve rod coincides with the center of the butterfly plate and the axis of the pipeline, and the butterfly plate is in full-diameter contact with the valve seat (valve body).

[0003] For the actual application of various types of valves, taking the butterfly valve as an example, the butterfly valve is usually installed between two sections of pipelines to achieve the function of cutting off the flow. The installation between the two ends of the butterfly valve and the two sections of pipelines is usually flange connection. In some large-size pipeline systems, a gap may occur when the butterfly valve is installed between two sections of pipelines, which is usually related to the deviation of the flange spacing, the unevenness of the pipeline / butterfly valve flange surface or the installation misalignment.

[0004] When the gap is small, the appropriate gasket (such as thickened rubber gasket, neoprene rubber gasket, etc.) can be replaced to fill the gap by using the compressibility of the gasket, and then the butterfly valve and the pipeline system are forcibly corrected by the combination of bolts and nuts. At this time, the pipeline system will slightly deform and generate a certain pressure between the supports, and the slight deformation pressure will not affect the sealing performance of the butterfly valve.

[0005] When the gap is slightly large, a multi-layer combined gasket (multi-layer metal gasket + non-metal gasket) can be used to fill the gap, and the installation of the butterfly valve and the pipeline system can also be realized by cooperating with the correction of the pipeline system.

[0006] When the gap is large, a custom-made short pipe (the material is consistent with that of the pipeline / butterfly valve, and the diameter is matched) needs to be added between the butterfly valve and the pipeline. The flanges are processed at both ends of the short pipe, and the butterfly valve and the pipeline are connected through the flanges or directly welded, so as to accurately fill the gap.

[0007] When the gap is too large, a custom short tube or a set of matching diameter telescopic compensation pipes (both ends are flanges) can also be used. The typical representative of telescopic compensation pipe is bellows compensator and sleeve compensator. The core element of bellows compensator is "bellows" (annular corrugated structure formed by metal sheet (such as stainless steel) through hydraulic forming). The annular corrugated design of bellows has good axial flexibility (the maximum amount of stretching / compression is called "compensation amount", usually tens to hundreds of millimeters), thereby absorbing axial displacement. Sleeve compensator is composed of "inner sleeve" and "outer sleeve". The inner sleeve is connected with one end of the pipe / butterfly valve, and the outer sleeve is connected with the other end of the pipe / butterfly valve. The relative telescopic expansion and contraction of the two is realized by sliding fit. When the pipe is elongated, the inner sleeve is retracted into the outer sleeve. When the pipe is contracted, the inner sleeve is extended from the outer sleeve. The displacement is absorbed by the axial sliding between the inner sleeve and the outer sleeve. The inner sleeve and the outer sleeve are sealed by elastic sealing elements (O-shaped sealing ring, etc.).

[0008] When the butterfly valve is installed in the pipe system, if the installation gap is slightly large or too large, custom short tube (flange connection / welding) or installation of telescopic compensator can effectively solve the problem. The custom short tube can adapt to a larger range of gap size changes (slightly large gap-large gap), but the custom short tube is more troublesome and needs to be made after measuring the actual pipe system. The telescopic compensator is usually only suitable for large installation gap due to its own length. The advantage is that it is easy to install and can be quickly connected by purchasing the corresponding size and diameter, but due to its telescopic nature, its sealing performance is inferior to that of the original pipe system, especially in high-pressure pipe systems. Therefore, we propose a butterfly valve with good sealing performance and suitable for small installation gap. SUMMARY

[0009] Therefore, the purpose of the present application is to provide a center type spiral butterfly valve to solve the technical problems mentioned in the above background.

[0010] To achieve the above object, the present application provides the following technical scheme: a center type spiral butterfly valve, comprising an external pipeline one and an external pipeline two, a center type butterfly valve is installed between the external pipeline one and the external pipeline two, an extension sleeve is arranged on one side of the center type butterfly valve, a bolt assembly is rotatably connected to the side surface of the extension sleeve, the bolt assembly extends into the interior of the extension sleeve, a top pressing plate is movably installed in the interior of the extension sleeve, the top pressing plate is threadedly connected with the bolt assembly, a sealing assembly is movably installed in the interior of the extension sleeve, rotating the bolt assembly drives the top pressing plate to move, which can push the sealing assembly to adhere to the flange plate of the external pipeline two, so as to seal and connect the center type butterfly valve, the extension sleeve and the external pipeline two, the sealing assembly comprises an inner pressing plate, an extrusion block is movably installed on the side surface of the inner pressing plate through an embedded groove, a middle pressing plate is installed on the side surface of the inner pressing plate, the edge extension of the middle pressing plate can wrap the extrusion block, a wide body sealing ring and an O-shaped sealing ring are respectively sleeved on the side surface of the middle pressing plate through a first installation groove and a second installation groove, and an installation pipe is arranged on the side surface of the middle pressing plate, and a second sealing gasket and an outer pressing plate are sleeved on the outside of the installation pipe.

[0011] By adopting the above technical scheme, the extension sleeve, the bolt assembly, the top pressing plate and the sealing assembly are arranged on one side of the center type butterfly valve, so that the butterfly valve can actively adapt to a certain size gap during installation, the extension sleeve is integrally formed with the valve body of the butterfly valve, a plurality of bolt assemblies are arranged in the interior of the extension sleeve to install the top pressing plate, rotating the bolt assembly can drive the top pressing plate to move along the axis of the pipeline system, the sealing assembly is movably installed on the side surface of the top pressing plate, and the sealing assembly and the inner wall of the extension sleeve are in sliding sealing connection, when the butterfly valve is installed and there is a certain installation gap in the pipeline system, rotating the plurality of bolt assemblies drives the top pressing plate to move, the top pressing plate pushes the sealing assembly to actively adhere to the flange plate of the pipeline system, and then the top pressing plate, the sealing assembly and the flange of the pipeline system are locked in the interior of the extension sleeve, so that the installation of the butterfly valve is convenient and fast, has certain installation strength and sealing performance, and can be adapted to installation in different pipeline system gaps.

[0012] The present application further provides that the center type butterfly valve comprises a valve body, one end of the valve body is a flange plate, the other end is connected with the extension sleeve, a barrel type sealing ring is installed in the interior of the valve body, a butterfly plate is movably installed in the interior of the barrel type sealing ring, a lengthened pipe is connected with the top flange of the valve body, a nameplate groove is arranged on the side surface of the lengthened pipe, a valve rod is rotatably connected in the interior of the valve body and the lengthened pipe, a sealing ring is arranged at the top installation connection of the valve rod and the lengthened pipe, the valve rod penetrates through the barrel type sealing ring and the butterfly plate, a limiting groove matched with the head of the valve rod is arranged in the interior of the butterfly plate, and a hand wheel is arranged on the top of the valve rod.

[0013] As a preferred, the extension sleeve and related components are arranged at one end of the valve body of the center type butterfly valve, so that the center type butterfly valve can be applied to different installation gaps.

[0014] The application is further provided that the valve flange plate is connected to the flange plate of the first external pipeline through a rubber sealing gasket.

[0015] Preferably, the installation sealing of the first external pipeline and the center butterfly valve support can be improved by setting the rubber sealing gasket.

[0016] The application is further provided that the bolt assembly includes a first threaded rod rotatably connected to the extension sleeve, the first threaded rod is externally provided with a gear, one side of the first threaded rod is provided with a second threaded rod, the end of the second threaded rod is provided with a third threaded rod, the third threaded rod is threadedly connected to the inner wall of the first threaded rod, and the outer part of the second threaded rod is threadedly connected with a fixing nut.

[0017] Preferably, the first threaded rod, the second threaded rod and the fixing nut of the bolt assembly are also used to fix the flange plate of the second external pipeline, so the length of the whole bolt assembly needs to match the installation gap between the first external pipeline and the second external pipeline, and the bolt assembly is set to a combination of the first threaded rod and the second threaded rod, when the center butterfly valve is initially clamped between the first external pipeline and the second external pipeline, the second threaded rod is not installed at this time, because the first threaded rod is relatively short, so the center butterfly valve, the extension sleeve and the multiple first threaded rods can be more conveniently clamped at an angle between the first external pipeline and the second external pipeline, and after the center butterfly valve, the extension sleeve and the multiple first threaded rods complete the angle clamping, the multiple second threaded rods are assembled with the multiple first threaded rods respectively, so that the second threaded rod can penetrate the flange plate of the second external pipeline and the fixing nut to engage, thereby achieving the purpose of locking the second external pipeline.

[0018] The application is further provided that the third threaded rod penetrates the other end of the first threaded rod, the second threaded rod, the third threaded rod and the first threaded rod are locked by setting a locking nut, and the size of the first threaded rod and the second threaded rod and the thread groove on the outer part thereof match.

[0019] Preferably, the first threaded rod and the second threaded rod can be fastened into a whole by the third threaded rod and the locking nut, and the thread groove on the outer part of the first threaded rod and the second threaded rod matches and connects, so that the whole bolt assembly can be rotated, and the pressing plate can be smoothly threadedly engaged and moved outside the first threaded rod and the second threaded rod.

[0020] The application is further provided that multiple bolt assemblies are provided, and the multiple bolt assemblies are evenly distributed on the side of the extension sleeve, the side of the extension sleeve is rotatably connected with a rotating wheel, the inner side of the rotating wheel is provided with an inner ring gear, and the inner ring gear and the gears of the multiple bolt assemblies are intermeshed.

[0021] Preferably, by setting a rotating and internal gear ring to drive the rotation of multiple bolt assemblies, the rotation of multiple bolt assemblies is made more convenient.

[0022] The present invention is further configured such that the extrusion blocks are provided in multiple sets, and the multiple sets of extrusion blocks are evenly distributed on the side of the inner pressure plate, and the side of each set of extrusion blocks is provided with a guide slope.

[0023] Preferably, by setting multiple sets of extrusion blocks to uniformly extrude the extension portion of the side edge of the intermediate pressure plate, the wide-body sealing ring can expand more evenly, thereby improving the sealing performance between the intermediate pressure plate and the inner wall of the extension sleeve.

[0024] The present invention is further configured such that the inner pressure plate and the middle pressure plate are fixed together by a plurality of screws, the inner pressure plate has a plurality of first threaded holes matching the screws on its side, and the middle pressure plate has a plurality of second threaded holes matching the screws on its side.

[0025] Preferably, the inner plate and the middle pressure plate are fixed with screws, so that the inner pressure plate and the middle pressure plate can be disassembled to facilitate the installation of the extrusion block on the inner pressure plate.

[0026] The present invention is further configured such that a first sealing gasket is provided between the top pressure plate and the inner pressure plate, and a third sealing gasket is provided between the outer pressure plate and the flange of the second external pipe. The first sealing gasket, the third sealing gasket, and the sealing assembly are all provided with through holes that match the bolt assembly.

[0027] Preferably, by providing through holes in the first sealing gasket, the third sealing gasket, and the sealing assembly that match the bolt assembly, the first sealing gasket, the third sealing gasket, and the sealing assembly can all be fitted onto the outside of the bolt assembly.

[0028] In summary, the present invention has the following main beneficial effects:

[0029] This invention, by incorporating an extension sleeve, bolt assembly, top pressure plate, and sealing assembly on one side of a central butterfly valve, allows the valve to actively adapt to gaps of a certain size during installation. The extension sleeve is integrally formed with the valve body. Multiple bolt assemblies are installed inside the extension sleeve to mount the top pressure plate. Rotating the bolt assemblies drives the top pressure plate to move along the axis of the piping system. The sealing assembly is movably mounted on the side of the top pressure plate, and the sealing assembly slides and seals against the inner wall of the extension sleeve. When there is a certain installation gap between the butterfly valve and the piping system, rotating the multiple bolt assemblies drives the top pressure plate to move. The top pressure plate pushes the sealing assembly to actively conform to the flange of the piping system. Then, located inside the extension sleeve, the flanges of the top pressure plate, sealing assembly, and piping system are locked together. This makes the butterfly valve easy and quick to install, provides a certain installation strength and sealing performance, and can be adapted to installation between different gaps in the piping system.

[0030] This invention improves the sealing performance of a butterfly valve installation by incorporating a sealing assembly. The sealing assembly includes an inner pressure plate, a middle pressure plate, and an outer pressure plate. Multiple sets of compression blocks are movably mounted on the side edge of the inner pressure plate. The middle pressure plate is fixed to the side of the inner pressure plate, and the inner wall of the extended portion of the middle pressure plate's side edge can wrap around the multiple sets of compression blocks of the inner pressure plate. A wide-body sealing ring is fitted onto the outer wall of the extended portion, fitting snugly against the inner wall of the extended sleeve. The outer pressure plate is movably mounted on the side of the middle pressure plate, and an O-ring seal is fitted between the middle pressure plate and the outer pressure plate. When the top pressure plate moves, it pushes the seal... When the component actively fits and locks onto the piping system flange, the top pressure plate pushes multiple sets of extrusion blocks to move and expand radially, extruding the extended portion on the side of the intermediate pressure plate. This allows the wide-body sealing ring fitted on the outside of the extended portion to fit more tightly against the inner wall of the extended sleeve. At the same time, the intermediate pressure plate and the outer pressure plate extrude the O-ring seal, causing the O-ring seal to also expand and fit against the inner wall of the extended sleeve. Under the dual sealing action of the wide-body sealing ring and the O-ring seal, the sealing effect between the sealing component and the extended sleeve is better, reducing media leakage from the extended sleeve. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0032] Figure 2 This is a schematic diagram showing the distribution of the central butterfly valve, extension sleeve, bolt assembly, and rotor of the present invention;

[0033] Figure 3 This is a schematic diagram of the internal structure of the center-type butterfly valve of the present invention;

[0034] Figure 4 This is a schematic diagram of the valve stem and butterfly plate installation according to the present invention;

[0035] Figure 5 This is a schematic diagram of the valve stem and butterfly plate fitting together according to the present invention;

[0036] Figure 6 This is a schematic diagram of the bolt assembly structure of the present invention;

[0037] Figure 7 This is a schematic diagram of the bolt assembly of the present invention;

[0038] Figure 8 A schematic diagram illustrating the process of installing the sealing assembly and the first sealing gasket of the present invention into the extension sleeve;

[0039] Figure 9 This is a schematic diagram showing the distribution of the rotating wheel and internal gear ring of the present invention;

[0040] Figure 10 This is a schematic diagram of the installation of the bolt assembly, top pressure plate, and sealing assembly of the present invention;

[0041] Figure 11 This is a schematic diagram of the sealing assembly structure of the present invention;

[0042] Figure 12 This is a schematic diagram showing the distribution of the inner pressure plate and multiple sets of extrusion blocks according to the present invention;

[0043] Figure 13 This is a schematic diagram showing the distribution of the inner pressure plate, extrusion block, and intermediate pressure plate of the present invention;

[0044] Figure 14 This is a schematic diagram of the installation of the bolt assembly, top pressure plate, first sealing gasket, sealing assembly, second sealing gasket, and external pipe of the present invention.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. External Pipeline 1; 2. External Pipeline 2; 3. Center-type Butterfly Valve; 301. Valve Body; 302. Cylindrical Sealing Ring; 303. Butterfly Plate; 304. Extension Pipe; 305. Nameplate Groove; 306. Sealing Gasket; 307. Valve Stem; 308. Handwheel; 309. Limit Groove; 4. Extension Sleeve; 5. Bolt Assembly; 501. First Threaded Rod; 502. Gear; 503. Second Threaded Rod; 504. Third Threaded Rod; 505. Lock Nut; 506. Fixing Nut; 6. Rotary Wheel; 7. Internal Gear Ring; 8. 9. Top pressure plate; 10. First sealing gasket; 11. Sealing assembly; 12. Inner pressure plate; 13. Fitting groove; 14. Extrusion block; 15. Guide slope; 16. First threaded hole; 17. Middle pressure plate; 18. Second threaded hole; 19. Screw; 20. First mounting groove; 21. Wide-body sealing ring; 22. Second mounting groove; 33. O-ring; 44. Mounting tube; 55. Second sealing gasket; 66. Outer pressure plate; 77. Third sealing gasket. Detailed Implementation

[0047] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0048] The embodiments of the present invention will now be described.

[0049] Please see Figures 1-14A central-type spiral butterfly valve includes an external pipe 1 and an external pipe 2. Both external pipes 1 and 2 have flanges at their ends. A central-type butterfly valve 3 is installed between the external pipes 1 and 2. The central-type butterfly valve 3 can intercept and regulate the flow of the medium. An extension sleeve 4 is provided on one side of the central-type butterfly valve 3, and a bolt assembly 5 is rotatably connected to the side of the extension sleeve 4, extending into the interior of the extension sleeve 4. A pressure plate 8 is movably installed inside the extension sleeve 4, and the pressure plate 8 is threadedly connected to the bolt assembly 5. A sealing assembly 10 is movably installed inside the extension sleeve 4. Rotating the bolt assembly 5 drives the pressure plate 8 to move, which pushes the sealing assembly 10 to fit against the flange of the external pipe 2. Thus, the central-type butterfly valve 3 and the extension sleeve 4... The sealing assembly 10 is sealed to the external pipe 2. The sealing assembly 10 includes an inner pressure plate 1001. An extrusion block 1003 is movably installed on the side of the inner pressure plate 1001 through an interlocking groove 1002. A middle pressure plate 1006 is installed on the side of the inner pressure plate 1001. The edge extension of the middle pressure plate 1006 can wrap the extrusion block 1003. The extrusion block 1003 can extrude the edge extension of the middle pressure plate 1006 by moving radially along the inner pressure plate 1001. A wide-body sealing ring 1010 and an O-ring sealing ring 1012 are respectively fitted on the side of the middle pressure plate 1006 through a first mounting groove 1009 and a second mounting groove 1011. An installation tube 1013 is provided on the side of the middle pressure plate 1006. A second sealing gasket 1014 and an outer pressure plate 1015 are fitted on the outside of the installation tube 1013.

[0050] Please refer to the above embodiments for further details. Figures 3-5 The central butterfly valve 3 includes a valve body 301, one end of which is a flange, and the other end is connected to an extension sleeve 4. A cylindrical sealing ring 302 is installed inside the valve body 301, and a butterfly plate 303 is movably installed inside the cylindrical sealing ring 302. An extension pipe 304 is connected to the top flange of the valve body 301. A nameplate groove 305 is provided on the side of the extension pipe 304. A valve stem 307 is rotatably connected inside the valve body 301 and the extension pipe 304. A sealing gasket 306 is provided at the top connection between the valve stem 307 and the extension pipe 304. The valve stem 307 passes through the cylindrical sealing ring 302 and the butterfly plate 303. A limiting groove 309 matching the head of the valve stem 307 is opened inside the butterfly plate 303. A handwheel 308 is provided at the top of the valve stem 307. By providing an extension sleeve 4 and related components at one end of the valve body 301 of the central butterfly valve 3, the central butterfly valve 3 can adapt to different installation gaps.

[0051] Please refer to the above embodiments for further details. Figure 1The flange of valve body 301 and the flange of external pipe 1 are connected by a rubber sealing gasket. The installation sealing between external pipe 1 and center butterfly valve 3 can be improved by setting a rubber sealing gasket.

[0052] Please refer to the above embodiments for further details. Figure 6 and Figure 7 The bolt assembly 5 includes a first threaded rod 501 rotatably connected to the extension sleeve 4, and a gear 502 is provided on the outside of the first threaded rod 501. A second threaded rod 503 is provided on one side of the first threaded rod 501, and a third threaded rod 504 is provided at the end of the second threaded rod 503. The third threaded rod 504 is threadedly connected to the inner wall of the first threaded rod 501, and a fixing nut 506 is threadedly connected to the outside of the second threaded rod 503. The first threaded rod 501, the second threaded rod 503, and the fixing nut 506 of the bolt assembly 5 are also used to fix and lock the flange of the external pipe 2. Therefore, the overall length of the bolt assembly 5 needs to match the installation gap between the external pipe 1 and the external pipe 2. Thus, the bolt assembly 5 is configured with the first threaded rod 501 and... The second threaded rod 503 is used in combination. When the central butterfly valve 3 needs to be initially engaged between external pipe 1 and external pipe 2, the second threaded rod 503 is not installed at this time. Since the first threaded rod 501 is shorter, the central butterfly valve 3, extension sleeve 4 and multiple sets of first threaded rods 501 can be more easily engaged between external pipe 1 and external pipe 2 at an inclined angle. After the central butterfly valve 3, extension sleeve 4 and multiple sets of first threaded rods 501 have completed the engagement angle and are aligned, multiple sets of second threaded rods 503 are then passed through the flange of external pipe 2 and assembled with multiple sets of first threaded rods 501 respectively. This allows the second threaded rod 503 to penetrate the flange of external pipe 2 and engage with the fixing nut 506, thereby achieving the purpose of locking external pipe 2.

[0053] Please refer to the above embodiments for further details. Figure 6 and Figure 7 The third threaded rod 504 passes through the other end of the first threaded rod 501. The second threaded rod 503, the third threaded rod 504 and the first threaded rod 501 are locked together by a locking nut 505. The dimensions of the first threaded rod 501 and the second threaded rod 503 and their external thread grooves are matched. The first threaded rod 501 and the second threaded rod 503 can be fastened together by the third threaded rod 504 and the locking nut 505 to make them a whole. The external thread grooves of the first threaded rod 501 and the second threaded rod 503 are matched and connected, so that the rotating bolt assembly 5 is a whole. The top pressure plate 8 can move smoothly in thread engagement with the outside of the first threaded rod 501 and the second threaded rod 503.

[0054] Please refer to the above embodiments for further details. Figure 8 andFigure 9 Multiple sets of bolt assemblies 5 are provided, and the multiple sets of bolt assemblies 5 are evenly distributed on the side of the extension sleeve 4. A rotating wheel 6 is rotatably connected to the side of the extension sleeve 4, and an internal gear ring 7 is provided on the inner side of the rotating wheel 6. The internal gear ring 7 and the gears 502 of the multiple sets of bolt assemblies 5 mesh with each other. By setting the rotating wheel 6 and the internal gear ring 7 to drive the multiple sets of bolt assemblies 5 to rotate, the rotation of the multiple sets of bolt assemblies 5 is made more convenient.

[0055] Please refer to the above embodiments for further details. Figure 12 Multiple sets of extrusion blocks 1003 are provided, and the multiple sets of extrusion blocks 1003 are evenly distributed on the side of the inner pressure plate 1001. The side of each set of extrusion blocks 1003 is provided with a guide slope 1004. By setting multiple sets of extrusion blocks 1003 to evenly extrude the extension of the side edge of the middle pressure plate 1006, the wide-body sealing ring 1010 can expand more evenly, thereby improving the sealing performance between the middle pressure plate 1006 and the inner wall of the extension sleeve 4.

[0056] Please refer to the above embodiments for further details. Figure 11 The inner pressure plate 1001 and the middle pressure plate 1006 are fixed together by a plurality of screws 1008. The inner pressure plate 1001 has a plurality of first threaded holes 1005 that match the screws 1008 on its side. The middle pressure plate 1006 has a plurality of second threaded holes 1007 that match the screws 1008 on its side. The inner pressure plate 1001 and the middle pressure plate 1006 are fixed together by screws 1008, so that the inner pressure plate 1001 and the middle pressure plate 1006 can be disassembled so that the extrusion block 1003 can be installed on the inner pressure plate 1001.

[0057] Please refer to the above embodiments for further details. Figure 14 A first sealing gasket 9 is provided between the top pressure plate 8 and the inner pressure plate 1001, and a third sealing gasket 11 is provided between the outer pressure plate 1015 and the flange of the external pipe 2. The first sealing gasket 9, the third sealing gasket 11 and the sealing assembly 10 are all provided with through holes that match the bolt assembly 5. By providing through holes that match the bolt assembly 5 in the first sealing gasket 9, the third sealing gasket 11 and the sealing assembly 10, the first sealing gasket 9, the third sealing gasket 11 and the sealing assembly 10 can all be fitted onto the outside of the bolt assembly 5.

[0058] In practical operation, the central butterfly valve 3, extension sleeve 4, first threaded rod 501, gear 502, rotating wheel 6, internal gear ring 7, and top pressure plate 8 are assembled immediately after manufacturing. In actual use, the construction personnel first clean the flange faces of external pipe 1 and external pipe 2. Then, the construction personnel need to assemble the central butterfly valve 3 and related equipment. First, the sealing assembly 10 is assembled. The construction personnel first engage multiple sets of extrusion blocks 1003 into the fitting groove 1002 of the inner pressure plate 1001. Then, the intermediate pressure plate 1006 is installed on the side of the inner pressure plate 1001 and fixed with screws 1008. The screws 1008 are secured by the second thread. Hole 1007 and first threaded hole 1005 fix inner pressure plate 1001 and middle pressure plate 1006 together. The edge extension of middle pressure plate 1006 wraps multiple sets of extrusion blocks 1003 to prevent multiple sets of extrusion blocks 1003 from sliding out of fitting groove 1002. Next, wide-body sealing ring 1010 is fitted into first mounting groove 1009, O-ring 1012 is fitted into second mounting groove 1011, second sealing gasket 1014 is fitted into the outside of mounting tube 1013, and finally outer pressure plate 1015 is fitted into the outside of mounting tube 1013. During the assembly of sealing assembly 10, the through holes of each component and bolt assembly 5 are aligned and installed.

[0059] Next, the construction workers aligned the through hole of the first sealing gasket 9 with the multiple sets of first threaded rods 501, and then fitted the first sealing gasket 9 onto the outside of the multiple sets of first threaded rods 501, making it fit against the top pressure plate 8. Then, the construction workers applied lubricant to the side of the sealing assembly 10, aligned the through hole of the sealing assembly 10 with the multiple sets of first threaded rods 501, and fitted the sealing assembly 10 onto the outside of the multiple sets of first threaded rods 501. Finally, they aligned the through hole of the third sealing gasket 11 with the multiple sets of first threaded rods 501 and fitted the third sealing gasket 11 onto the multiple sets of first threaded rods 501. The outer side of the first threaded rod 501 is then fitted with the center butterfly valve 3 and its assembled parts at an inclined angle between the external pipe 1 and the external pipe 2. During the fitting, the entire equipment is tilted so that the extension sleeve 4 is first fitted onto the outside of the external pipe 2, allowing the external pipe 2 to extend into the interior of the extension sleeve 4. Subsequently, the other end of the center butterfly valve 3 can be aligned and a set of rubber sealing gaskets can be installed to connect with the flange of the external pipe 1. The external pipe 1 and the center butterfly valve 3 are then fixed using a combination of bolts and nuts.

[0060] Next, the construction workers will pass a set of second threaded rods 503 through the through hole of the external pipe 2 flange and through the through hole of the sealing component 10. They will continuously rotate the second threaded rods 503 and use the internal threads of the third threaded rod 504 at its end to connect with the first threaded rod 501. The third threaded rod 504 at the end of the second threaded rod 503 will pass through the first threaded rod 501. After the first threaded rod 501 and the second threaded rod 503 are assembled, the locking nut 505 is screwed onto the outside of the third threaded rod 504 to fix the first threaded rod 501 and the second threaded rod 503 together. After the first threaded rod 501 and the second threaded rod 503 are combined, their external thread grooves form a whole. The installation of other second threaded rods 503 is completed in the same way.

[0061] Next, rotating the wheel 6 drives the internal gear ring 7 on its inner side to rotate. The rotation of the internal gear ring 7 drives multiple sets of gears 502 to rotate, which in turn drives multiple sets of first threaded rods 501 to rotate. The multiple sets of first threaded rods 501 drive the second threaded rods 503 connected to them to rotate synchronously. When the multiple sets of first threaded rods 501 and second threaded rods 503 rotate synchronously, the top pressure plate 8, which is threaded to the outside of the multiple sets of first threaded rods 501 and second threaded rods 503, moves along the axis of external pipe 1 and external pipe 2. Then, the top pressure plate 8 pushes the first sealing gasket 9, sealing assembly 10, and third sealing gasket 11 to move and actively approach and fit the flange of external pipe 2.

[0062] After the top pressure plate 8, the first sealing gasket 9, the sealing assembly 10, the third sealing gasket 11, and the flange of the external pipe 2 are properly fitted, the external force is used to fix the rotating wheel 6, and multiple sets of fixing nuts 506 are screwed onto the outside of multiple sets of second threaded rods 503 one by one in the order of their relative positions. Tightening the multiple sets of fixing nuts 506 will cause the external pipe 2 to move and deform slightly, thus completing the fitting of the top pressure plate 8, the first sealing gasket 9, the sealing assembly 10, the third sealing gasket 11, and the external pipe 2. The flanges are interlocked. During the locking process, the side edge of the top pressure plate 8 presses against the guide slope 1004 of the multiple sets of extrusion blocks 1003, causing the multiple sets of extrusion blocks 1003 to move radially along the inner pressure plate 1001 and press the side edge extension of the middle pressure plate 1006. As a result, the side edge extension of the middle pressure plate 1006 expands and presses against the wide-body sealing ring 1010, making the wide-body sealing ring 1010 fit more tightly against the inner wall of the extension sleeve 4, and making the middle pressure plate 1006 and the extension sleeve... The inner walls of the extension sleeve 4 are sealed, and the side of the top pressure plate 8 presses against the first sealing gasket 9, thus sealing the top pressure plate 8 and the inner pressure plate 1001. Simultaneously, the outer pressure plate 1015 is compressed and moves along the axis of the mounting tube 1013, compressing the second sealing gasket 1014, thus sealing the middle pressure plate 1006 and the outer pressure plate 1015. At the same time, the outer pressure plate 1015 compresses the O-ring 1012, thus sealing the middle pressure plate 1006 and the interior of the extension sleeve 4 again. The flange of external pipe 2 compresses the third sealing gasket 11 to seal the gap between the external pressure plate 1015 and the flange of external pipe 2. After the central butterfly valve 3 is installed in this way, the medium flows from the external pipe 1, flows through the central butterfly valve 3 into the inside of the extension sleeve 4, and enters the inside of external pipe 2. Under the double expansion and compression sealing action of the wide-body sealing ring 1010 and the O-ring sealing ring 1012 of the sealing assembly 10, the medium will not leak from the inner wall of the extension sleeve 4.

[0063] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the invention and are not intended to limit it. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the invention, but such modifications, substitutions, and variations are protected by patent law as long as they are within the scope of the claims of the present invention.

Claims

1. A center-body screw-type butterfly valve comprising an outer pipe 1 and an outer pipe 2, characterized in that: The outer pipeline one (1) and outer pipeline two (2) are provided with a center type butterfly valve (3), one side of the center type butterfly valve (3) is provided with an extension sleeve (4), the side of the extension sleeve (4) is rotatably connected with a bolt assembly (5), and the bolt assembly (5) extends to the inside of the extension sleeve (4), the inside of the extension sleeve (4) movably installs a top pressing plate (8), the top pressing plate (8) and the bolt assembly (5) are threadedly connected, and the inside of the extension sleeve (4) movably installs a sealing assembly (10), rotating the bolt assembly (5) drives the top pressing plate (8) to move, which can push the sealing assembly (10) to adhere to the flange plate of the outer pipeline two (2), and then the center type butterfly valve (3), the extension sleeve (4) and the outer pipeline two (2) are sealingly connected, the sealing assembly (10) comprises an inner pressing plate (1001), a plurality of extrusion blocks (1003) are movably installed on the side of the inner pressing plate (1001) by opening a fitting groove (1002), the plurality of extrusion blocks (1003) are evenly distributed on the side of the inner pressing plate (1001), the side of the plurality of extrusion blocks (1003) is provided with a guide inclined surface (1004), the side of the inner pressing plate (1001) is provided with a middle pressing plate (1006), the edge extension part of the middle pressing plate (1006) can wrap the extrusion block (1003), the side of the middle pressing plate (1006) is provided with a first mounting groove (1009) and a second mounting groove (1011), and the side of the middle pressing plate (1006) is provided with a mounting pipe (1013), and the outside of the mounting pipe (1013) is provided with a second sealing gasket (1014) and an outer pressing plate (1015), in the locking process, the side edge of the top pressing plate (8) extrudes the guide inclined surface (1004) of the plurality of extrusion blocks (1003), so that the plurality of extrusion blocks (1003) move along the radial direction of the inner pressing plate (1001) and extrude the side edge extension part of the middle pressing plate (1006), so that the side edge extension part of the middle pressing plate (1006) expands and extrudes the wide body sealing ring (1010), so that the wide body sealing ring (1010) is more closely adhered to the inner wall of the extension sleeve (4), so that the middle pressing plate (1006) and the inner wall of the extension sleeve (4) are sealed.

2. A center-body screw-type butterfly valve according to claim 1, characterized in that: Said center type butterfly valve (3) includes valve body (301), one end of valve body (301) is flange plate, the other end is connected with extension sleeve (4), and the inside of valve body (301) is provided with cylindrical sealing ring (302), the inside of cylindrical sealing ring (302) is movably provided with butterfly plate (303), the top flange of valve body (301) is connected with lengthening pipe (304), the side of lengthening pipe (304) is provided with nameplate groove (305), the inside of valve body (301) and lengthening pipe (304) is rotatably connected with valve stem (307), and the top of valve stem (307) and lengthening pipe (304) is provided with sealing washer (306) at the connecting place, valve stem (307) penetrates cylindrical sealing ring (302) and butterfly plate (303), the inside of butterfly plate (303) is provided with limit slot (309) matched with the head of valve stem (307), and the top of valve stem (307) is provided with hand wheel (308).

3. A center-body screw-type butterfly valve according to claim 2, characterized in that: The flange plate of valve body (301) is connected with the flange plate of external pipeline one (1) through rubber sealing washer.

4. A center-body type spiral butterfly valve according to claim 3, wherein: Said bolt assembly (5) includes first threaded rod (501) rotatably connected with extension sleeve (4), the outside of first threaded rod (501) is provided with gear (502), one side of first threaded rod (501) is provided with second threaded rod (503), the end of second threaded rod (503) is provided with third threaded rod (504), third threaded rod (504) is threadedly connected with the inner wall of first threaded rod (501), and the outside of second threaded rod (503) is threadedly connected with fixing nut (506).

5. A center-body screw-type butterfly valve according to claim 4, characterized in that: Said third threaded rod (504) penetrates the other end of first threaded rod (501), second threaded rod (503), third threaded rod (504) and first threaded rod (501) are locked through locking nut (505), and the size of first threaded rod (501) and second threaded rod (503) and the thread groove outside them are matched.

6. A center-body type screw-type butterfly valve according to claim 5, characterized in that: Said bolt assembly (5) is provided with multiple groups, and the multiple groups of bolt assemblies (5) are evenly distributed on the side of extension sleeve (4), the side of extension sleeve (4) is rotatably connected with rotating wheel (6), the inside of rotating wheel (6) is provided with inner ring gear (7), and inner ring gear (7) and the gears (502) of multiple groups of bolt assemblies (5) are meshed with each other.

7. A center-body screw-type butterfly valve according to claim 6, characterized in that: Said inner pressure plate (1001) and middle pressure plate (1006) are fixed through multiple groups of screws (1008), a plurality of first threaded holes (1005) matched with screws (1008) are formed on the side of inner pressure plate (1001), and a plurality of second threaded holes (1007) matched with screws (1008) are formed on the side of middle pressure plate (1006).

8. A center-body screw-type butterfly valve according to claim 7, characterized in that: Said first sealing washer (9) is arranged between top pressure plate (8) and inner pressure plate (1001), third sealing washer (11) is arranged between outer pressure plate (1015) and the flange plate of external pipeline two (2), and first sealing washer (9), third sealing washer (11) and sealing assembly (10) are all provided with through holes matched with bolt assembly (5).

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