High pressure slow closing butterfly valve

Abstract

The utility model provides a kind of high-pressure slow-closing butterfly valve, including butterfly valve and slow-closing component, the center of butterfly valve is equipped with mounting hole, slow-closing component includes damper body, elastic member and locking piece, damper body includes plugging bottom disc and damping cylinder, damping cylinder is movably arranged in mounting hole, damping cylinder is equipped with damping hole, plugging bottom disc is used to block mounting hole.Such in butterfly valve realizes mechanical closure, damper body temporarily retains a small amount of flow area by damping hole, then damper body under the action of fluid pressure difference, a small amount of fluid is leaked to low pressure side through damping hole, fluid itself momentum pushes damper body to sealing surface to move until plugging bottom disc completely blocks mounting hole, so as to greatly reduce water hammer pressure peak value, to protect host pump shell and pipe network from impact, reach the purpose of prolonging its service life, it does not need to change the flange spacing and driving interface of existing butterfly valve, integrated structure greatly reduces the space occupation of parts, and installation is simple, convenient to operate.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, and in particular to a high-pressure slow-closing butterfly valve. Background Technology

[0002] Thin slab continuous casting and rolling is a core and critical step in modern steel production. The high-pressure, large-diameter water supply system, as a core supporting unit of this process, undertakes key functions such as roller cooling, equipment lubrication, and temperature control. In actual industrial scenarios, this water supply system often faces sudden operating conditions such as pump shutdowns and power outages, or emergency valve closures due to operational errors. Such situations can cause a sharp change in fluid velocity within the pipeline, creating a strong water hammer effect and generating instantaneous pressure peaks far exceeding the design pressure range of the pipeline and equipment. These peak pressures can easily cause catastrophic accidents such as pipe bursts, weld tears, and impact deformation of the main pump casing, leading not only to prolonged production interruptions but also incurring high equipment maintenance costs and economic losses.

[0003] In existing technologies, ordinary high-pressure water valves used in such high-pressure water transmission systems generally suffer from serious reliability defects under frequent opening and closing conditions. The most typical failure mode is stem necking fracture, with the fracture surface often exhibiting characteristic fatigue shell-like patterns. Industry research has confirmed that the core cause of this failure problem is the coupled alternating load formed by water hammer waves and mechanical vibration. This load acts repeatedly on the stress concentration points of the valve stem over a long period, leading to the continuous accumulation of material fatigue damage and ultimately causing sudden fracture, severely affecting the stability of system operation. To mitigate the hazards of water hammer, some slow-closing valve products on the market require modifications to the flange spacing or drive interface dimensions of the original pipeline. This necessitates large-scale pipeline dismantling and reconstruction for upgrading existing equipment, resulting in long construction cycles, high modification costs, and prolonged production downtime, making it difficult to meet the economic and convenient requirements of enterprises for equipment upgrades.

[0004] Therefore, it is necessary to propose a high-pressure slow-closing butterfly valve to solve or at least alleviate the above-mentioned defects. Utility Model Content

[0005] The main purpose of this utility model is to provide a high-pressure slow-closing butterfly valve to solve the problem that water valves in the prior art are prone to valve stem breakage, but replacing the product requires a lot of pipeline modification, resulting in high costs.

[0006] To achieve the above objectives, this utility model provides a high-pressure slow-closing butterfly valve, comprising a butterfly valve and a slow-closing assembly; wherein, The butterfly valve has a mounting hole at its center that extends along its own axial direction. The slow-closing assembly includes a damping body, an elastic element, and a locking element. The damping body includes a sealing base and a damping cylinder arranged perpendicularly to each other. The damping cylinder passes through the mounting hole and is movably disposed along the axial direction of the butterfly valve. The first end of the damping cylinder is used to abut against one side of the butterfly valve by the locking member, and the damping cylinder has a damping hole for water supply. The sealing base is connected to the second end of the damping cylinder and disposed on the other side of the butterfly valve. The elastic member is connected between the sealing base and the butterfly valve. The sealing base is used to seal the mounting hole.

[0007] Preferably, the butterfly valve includes a valve body, a butterfly disc, and two pins. The two pins are arranged radially opposite to each other along the valve body and connected to both ends of the butterfly disc. The pins penetrate the side wall of the valve body to drive the butterfly disc to be rotatably disposed in the valve body. The mounting hole is formed at the center of the butterfly disc.

[0008] Preferably, the butterfly valve further includes a bushing, which is connected to one side of the butterfly plate and is coaxially arranged with the mounting hole. The sealing base plate has an annular protrusion on the side near the butterfly plate, which is used to fit against the inner wall of the bushing.

[0009] Preferably, the elastic element is a spring, which is sleeved on the damping cylinder and disposed inside the annular protrusion, and the spring is connected between the sealing chassis and the disc.

[0010] Preferably, the locking element is a retaining ring, the first end of the damping cylinder is recessed to form an annular groove, the inner circumferential side of the retaining ring is engaged in the annular groove, and the outer circumferential side of the retaining ring is used to abut against one side of the disc.

[0011] Preferably, the annular protrusion has an annular groove formed by a recess at one end near the disc, and a sealing ring is provided in the annular groove.

[0012] Preferably, the valve also includes a cylinder, the drive end of which is connected to a pin of the butterfly valve.

[0013] Preferably, the reserved gap between the sealing chassis and the bushing is 6mm to 8mm.

[0014] Preferably, a group of damping holes arranged circumferentially along the damping cylinder is a damping hole group, and the damping cylinder has multiple groups of damping holes arranged axially along its own axis.

[0015] Preferably, the diameter of each damping orifice is 2mm to 3mm.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This utility model provides a high-pressure slow-closing butterfly valve, including a butterfly valve and a slow-closing assembly. The butterfly valve has a mounting hole extending axially at its center. The slow-closing assembly includes a damping body, an elastic element, and a locking element. The damping body includes a sealing base and a damping cylinder arranged perpendicularly to each other. The damping cylinder passes through the mounting hole and is movably arranged axially along the butterfly valve. The first end of the damping cylinder is held against one side of the butterfly valve by the locking element, and the damping cylinder has a damping hole for water supply. The sealing base is connected to the second end of the damping cylinder and is arranged on the other side of the butterfly valve. The elastic element is connected between the sealing base and the butterfly valve. The sealing base is used to seal the mounting hole. After the butterfly valve achieves mechanical closure, the damping body temporarily retains a small amount of flow area through the damping orifice. Subsequently, under the action of fluid pressure difference, a small amount of fluid leaks to the low-pressure side through the damping orifice. The momentum of the fluid itself pushes the damping body to move towards the sealing surface until the mounting hole is completely sealed by the sealing chassis. This significantly reduces the peak water hammer pressure, protecting the main pump casing and pipeline from impact and extending their service life. It does not require modification of the flange spacing and drive interface of the existing butterfly valve. The integrated structure greatly reduces the space occupied by the components and is simple to install and easy to operate. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a three-dimensional schematic diagram of the overall structure in one embodiment of the present utility model; Figure 2 This is a three-dimensional schematic diagram of the slow-closing state in one embodiment of the present invention; Figure 3 This is a three-dimensional schematic diagram of the slow-closing component in one embodiment of the present invention; Figure 4 This is an exploded view of the overall structure in one embodiment of the present invention; Figure 5 This is a cross-sectional schematic diagram of the state before slow closing in one embodiment of the present invention. Figure 6 This is a cross-sectional schematic diagram of the slow-closing state in one embodiment of the present invention.

[0019] The purpose, features, and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0020] Explanation of icon numbers: 10. Butterfly valve; 110. Valve body; 120. Butterfly disc; 121. Mounting hole; 122. Bushing; 130. Pin rod; 20. Slow-closing assembly; 210. Damping body; 211. Sealing base; 212. Damping cylinder; 213. Damping hole; 214. Annular protrusion; 215. Annular groove; 220. Elastic element; 221. Spring; 230. Locking element; 231. Snap ring. Detailed Implementation

[0021] It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0024] Furthermore, the use of terms such as "first" and "second" in this utility model is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0025] Please see the appendix Figure 1-6 The present invention provides a high-pressure slow-closing butterfly valve 10 in one embodiment, comprising a butterfly valve 10 and a slow-closing assembly 20, the specific details of which are as follows: The butterfly valve 10 has a mounting hole 121 extending axially at its center; the slow-closing assembly 20 includes a damping body 210, an elastic element 220, and a locking element 230. The damping body 210 includes a sealing base 211 and a damping cylinder 212 arranged perpendicularly to each other. The damping cylinder 212 passes through the mounting hole 121 and is movably arranged axially along the butterfly valve 10. The first end of the damping cylinder 212 is held against one side of the butterfly valve 10 by the locking element 230, and the damping cylinder 212 has a damping hole 213 for water flow. The sealing base 211 is connected to the second end of the damping cylinder 212 and is arranged on the other side of the butterfly valve 10. The elastic element 220 is connected between the sealing base 211 and the butterfly valve 10. The sealing base 211 is used to seal the mounting hole 121.

[0026] Specifically, the high-pressure slow-closing butterfly valve 10 in this application includes a butterfly valve 10 and a slow-closing assembly 20. The butterfly valve 10 is a commonly used valve, which typically includes a valve body 110, a butterfly plate 120, and two pins 130. The two pins 130 are arranged radially opposite to each other along the valve body 110 and connected to both ends of the butterfly plate 120. The pins 130 penetrate the side wall of the valve body 110 to drive the butterfly plate 120 to be rotatably disposed inside the valve body 110. Usually, the valve body 110 is opened / closed by rotating the pins 130 to drive the butterfly plate 120 to rotate. In this application, a mounting hole 121 is provided at the center of the butterfly plate 120 to install the slow-closing assembly 20 in the mounting hole 121, thereby integrating it with the entire butterfly valve 10 to construct the core structural framework of the "two-step closing" slow-closing function.

[0027] The slow-closing assembly 20 includes a damping body 210, an elastic element 220, and a locking element 230. The damping body 210 adopts a vertical design between the sealing chassis 211 and the damping cylinder 212. The damping hole 213 on the damping cylinder 212 is used for water supply, realizing controllable fluid leakage and serving as the core carrier of the "variable damping" effect. Under the action of fluid pressure difference, a small amount of fluid leaks to the low-pressure side through the damping hole 213. The momentum of the fluid itself pushes the damping body 210 to move towards the sealing surface until the sealing chassis 211 completely seals the mounting hole 121, thereby significantly reducing the peak water hammer pressure and achieving the slow-closing effect. The elastic element 220 ensures... Under pressureless conditions, the damping body 210 quickly returns to its original position to keep the butterfly valve 10 open, while the locking element 230 limits the axial sliding range of the damping body 210 to prevent overtravel failure. In this way, there is no need to modify the flange spacing and drive interface of the existing butterfly valve 10. The water hammer suppression function can be achieved simply by using the built-in slow-closing component 20, which perfectly meets the upgrade and transformation needs of existing equipment. At the same time, the integrated structure greatly reduces the space occupied by the components, avoids the complex installation of traditional external auxiliary equipment (such as energy absorption tanks), and improves the overall structural compactness and operational stability of the valve. It fundamentally solves the technical pain point that ordinary high-pressure water valves cannot actively resolve the water hammer effect.

[0028] During operation: After receiving a closing signal, the actuator of the butterfly valve 10 (butterfly plate 120) quickly performs a closing rotation stroke of 0° to 90°. At this time, the butterfly plate 120 is in the "mechanically closed" position, and the damping body 210 still retains a small amount of flow area. Subsequently, under the action of fluid pressure difference, a small amount of fluid leaks to the low-pressure side through the damping hole 213 of the damping body 210. The momentum of the fluid itself pushes the damping body 210 to move towards the sealing surface. The damping hole 213 is blocked piece by piece by the bushing 122 of the valve body 110 along the stroke, and the flow area decreases, presenting a double slow-closing effect until it is completely sealed, thereby reducing the peak water hammer pressure and protecting the main pump casing and pipeline from impact, thus extending their service life. When it is necessary to open the valve normally, the actuator rotates 90° to open the butterfly plate 120. When the pressure is lost, the elastic element 220 drives the damping body 210 to reset, in preparation for the next slow closure.

[0029] In a preferred embodiment of the present invention, the butterfly valve 10 further includes a bushing 122, which is connected to one side of the butterfly plate 120 and is coaxially arranged with the mounting hole 121. The sealing base 211 has an annular protrusion 214 protruding on the side near the butterfly plate 120, which is used to fit against the inner wall of the bushing 122.

[0030] It should be noted that the close fit between the bushing 122 and the annular protrusion 214 can limit the radial displacement of the damping body 210 during the sliding process, ensuring that the damping hole 213 on the damping cylinder 212 can be precisely aligned with the bushing 122, thereby achieving the "variable damping" effect of decreasing flow area; at the same time, the fit between the annular protrusion 214 and the bushing 122 can also prevent mud, sand and impurities in the pipe from entering the spring 221 cavity, preventing the elastic element 220 from failing due to impurity intrusion.

[0031] In a preferred embodiment of the present invention, the elastic element 220 is a spring 221, which is sleeved on the damping cylinder 212 and disposed inside the annular protrusion 214, and the spring 221 is connected between the sealing base 211 and the disc 120.

[0032] It is worth noting that spring 221, as a standardized component, has the advantages of low cost, easy availability, and convenient disassembly and assembly. It can meet the needs of online replacement and can complete maintenance without disassembling the pipeline. Thus, by utilizing the elastic restoring force of spring 221, it can ensure that the damping body 210 can quickly return to the open state when there is no pressure.

[0033] In a preferred embodiment of the present invention, the locking member 230 is a retaining spring 231, the first end of the damping cylinder 212 is recessed to form an annular groove, the inner circumferential side of the retaining spring 231 is engaged in the annular groove, and the outer circumferential side of the retaining spring 231 is used to abut against one side of the disc 120.

[0034] It is worth noting that the application of the standard snap ring 231 significantly reduces the cost of purchasing and replacing parts, and the assembly process is simple. It reliably ensures that when the damping cylinder 212 is in the open state, it returns to its original position with the spring 221 and its first end can be engaged with the snap ring 231 and locked onto the disc 120, so that it will not slip off axially.

[0035] Furthermore, an annular groove 215 is formed by a recess at one end of the annular protrusion 214 near the disc 120, and a sealing ring (not shown in the figure) is provided in the annular groove 215.

[0036] It should be noted that the annular protrusion 214 and the bushing 122 are attached to each other and cooperate with the sealing ring to form a double sealing structure between the damping body 210 and the bushing 122. The sealing ring can effectively fill the tiny gap between the annular protrusion 214 and the bushing 122, preventing high-pressure fluid from leaking out of the gap, and further blocking mud and impurities from entering the spring 221 cavity. It is worth mentioning that the sealing ring can adopt a structure of high-pressure resistant O-ring and step seal combination.

[0037] Furthermore, it also includes a cylinder (not shown in the figure), the drive end of which is connected to a pin 130 of the butterfly valve 10.

[0038] It should be understood that the cylinder has a fast response speed and can be directly connected to the pneumatic control interface of the existing high-pressure water transmission system without the need to reconstruct the drive circuit, thus reducing the cost of equipment upgrades.

[0039] Furthermore, the reserved gap between the sealing chassis 211 and the bushing 122 is 6mm~8mm.

[0040] It should be noted that this interval is the axial sliding stroke of the damper 210. It needs to ensure that the damper 210 has enough room to move so that the damping hole 213 can be blocked by the bushing 122 piece by piece, thereby reducing the flow area and meeting the slow closing time requirement; while avoiding valve closing delay caused by excessive stroke, ensuring that the system can cut off the flow in time. Preferably, it can be set to 6mm, and those skilled in the art can set it according to actual needs.

[0041] Furthermore, a group of damping holes 213 arranged circumferentially along the damping cylinder 212 is a damping hole 213 group, and the damping cylinder 212 has multiple groups of damping holes 213 arranged axially along its own axis.

[0042] It should be noted that when the damper 210 slides axially, the damping holes 213 are blocked by the bushing 122 from one end to the other, so that the flow area gradually decreases as the damper 210 moves. At the same time, the circumferentially spaced damping holes 213 design ensures the uniformity of fluid leakage and avoids the damper 210 from impact or vibration caused by excessive local flow velocity. Preferably, the diameter of each damping hole 213 is 2mm to 3mm, and the specific value can be set by those skilled in the art according to the fluid characteristics and slow closure requirements of the high-pressure water transmission system.

[0043] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A high-pressure slow-closing butterfly valve, characterized in that, This includes butterfly valves and slow-closing components; among which, The butterfly valve has a mounting hole at its center that extends along its own axial direction. The slow-closing assembly includes a damping body, an elastic element, and a locking element. The damping body includes a sealing base and a damping cylinder arranged perpendicularly to each other. The damping cylinder passes through the mounting hole and is movably disposed along the axial direction of the butterfly valve. The first end of the damping cylinder is used to abut against one side of the butterfly valve by the locking member, and the damping cylinder has a damping hole for water supply. The sealing base is connected to the second end of the damping cylinder and disposed on the other side of the butterfly valve. The elastic member is connected between the sealing base and the butterfly valve. The sealing base is used to seal the mounting hole.

2. The high-pressure slow-closing butterfly valve according to claim 1, characterized in that, The butterfly valve includes a valve body, a butterfly disc, and two pins. The two pins are arranged radially opposite to each other along the valve body and connected to both ends of the butterfly disc. The pins pass through the side wall of the valve body to drive the butterfly disc to be rotatably mounted in the valve body. The mounting hole is formed at the center of the butterfly disc.

3. The high-pressure slow-closing butterfly valve according to claim 2, characterized in that, The butterfly valve also includes a bushing, which is connected to one side of the butterfly plate and is coaxially arranged with the mounting hole. The sealing base plate has an annular protrusion on the side near the butterfly plate, which is used to fit against the inner wall of the bushing.

4. The high-pressure slow-closing butterfly valve according to claim 3, characterized in that, The elastic element is a spring, which is sleeved on the damping cylinder and located inside the annular protrusion, and the spring is connected between the sealing chassis and the disc.

5. The high-pressure slow-closing butterfly valve according to claim 4, characterized in that, The locking element is a retaining ring. The first end of the damping cylinder is recessed to form an annular groove. The inner circumference of the retaining ring is engaged in the annular groove, and the outer circumference of the retaining ring is used to abut against one side of the disc.

6. The high-pressure slow-closing butterfly valve according to claim 3, characterized in that, The annular protrusion has an annular groove formed by a recess at one end near the disc, and a sealing ring is provided in the annular groove.

7. The high-pressure slow-closing butterfly valve according to claim 2, characterized in that, It also includes a cylinder, the drive end of which is connected to a pin of the butterfly valve.

8. The high-pressure slow-closing butterfly valve according to claim 3, characterized in that, The reserved gap between the sealing chassis and the bushing is 6mm~8mm.

9. The high-pressure slow-closing butterfly valve according to claim 1, characterized in that, Multiple damping holes arranged at intervals along the circumference of the damping cylinder constitute a damping hole group, and multiple damping hole groups arranged at intervals along their own axial direction are provided on the damping cylinder.

10. The high-pressure slow-closing butterfly valve according to claim 9, characterized in that, The diameter of each damping orifice is 2mm to 3mm.

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