Impact resistant stop valve
By introducing a dual buffer structure of suspension and guide components into the gate valve, the problem of traditional gate valves being easily damaged under high-speed fluid impact is solved, achieving higher sealing reliability and service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG BACH VALVE TECH CO LTD
- Filing Date
- 2025-10-21
- Publication Date
- 2026-06-26
AI Technical Summary
Traditional gate valves, used in industrial pipeline systems such as chemical and water supply and drainage systems, are susceptible to high-speed fluid impacts due to their integral rigid connection of the valve stem. This can lead to bending of the drive rod, breakage of the handwheel, and lateral displacement of the valve core, resulting in misalignment and leakage of the sealing surface.
The system employs a dual buffer structure consisting of a suspension component and a guide component. The magnetic levitation buffer absorbs the impact energy, while the guide groove and the reset spring work together to prevent misalignment of the sealing surface. The flow channel also decomposes the fluid impact force.
It significantly improves the valve's impact resistance and sealing reliability, extends its service life, and reduces the risk of production interruption and maintenance costs.
Smart Images
Figure CN224414495U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of gate valve technology, specifically to an impact-resistant gate valve. Background Technology
[0002] A gate valve is a type of valve that uses the valve core to move up and down along the valve seat axis to achieve fluid flow control and flow regulation. It is widely used in water supply and drainage, petrochemical, thermal engineering, shipbuilding and other fields. Its core function is to accurately cut off or regulate the flow of liquid, gas and other media in pipelines. It is especially suitable for scenarios that require strict control of the flow of media.
[0003] Gate valves are characterized by simple structure, good sealing performance, and convenient operation and maintenance. Since the sealing surface of the gate valve bears the full pressure of the working medium in the closed state, the sealing surface has high requirements to ensure the reliability and service life of the valve.
[0004] In industrial pipeline systems such as chemical and water supply and drainage systems, when a gate valve is closed, it needs to briefly block high-speed fluid, which can easily create water hammer impacts several times the normal pressure. The resulting large impact force acts on the valve core. Traditional gate valves have a rigid, one-piece valve stem, relying solely on the gap between the valve body and the valve stem for guidance. The impact force is directly transmitted to the drive rod and handwheel, which can easily lead to bending of the drive rod and breakage of the handwheel. At the same time, the valve core will experience a certain lateral displacement, causing misalignment of the sealing surface and the formation of gaps, resulting in leakage. Therefore, an impact-resistant gate valve is proposed to address the above problems. Utility Model Content
[0005] The purpose of this invention is to provide an impact-resistant shut-off valve to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution:
[0007] An impact-resistant shut-off valve includes a valve body, a valve stem, and a valve core. The valve core is adapted to a flow hole inside the valve body. The valve stem includes an upper driving rod and a lower driven rod. A suspension assembly is provided between the bottom end of the driving rod and the top end of the driven rod. A guide assembly is provided on the outer side of the bottom end of the driving rod and the top end of the driven rod. The suspension assembly includes an annular magnetic groove formed at the bottom end of the driving rod and the top end of the driven rod. A magnetic sleeve and a magnetic ring are embedded in the inner cavity of the annular magnetic groove. The outer circular surface of the magnetic ring fits against the inner circular surface of the magnetic sleeve, and the outer circular surface of the magnetic sleeve fits against the inner circular surface of the annular magnetic groove. The annular magnetic groove, the magnetic sleeve, and the magnetic ring are all coaxially arranged with the driving rod and the driven rod. The opposing surfaces of the two magnetic rings are arranged with the same magnetic poles.
[0008] As a further optimization of this utility model, the magnetic sleeve and the magnetic ring are at the same height, and the magnetic sleeve and the magnetic ring are flush with the annular magnetic groove.
[0009] As a further optimization of this utility model, the guide assembly includes a guide sleeve, which is sleeved on the outside of the bottom end of the drive rod and the top end of the driven rod. The upper part of the inner wall of the guide sleeve is provided with multiple limiting grooves, and the lower part of the inner wall of the guide sleeve is provided with multiple longitudinally arranged guide grooves.
[0010] As a further optimization of this utility model, the following features are provided: multiple limiting blocks are fixedly connected to the outer side of the bottom end of the drive rod; the limiting blocks and limiting grooves are equal in number, corresponding in position, and matched in specifications; the limiting blocks and limiting grooves are distributed in a circumferential array; and each limiting block is inserted into its corresponding limiting groove.
[0011] As a further optimization of this utility model, a plurality of guide blocks are fixedly connected to the outer side of the top of the driven rod. The guide blocks and guide grooves are equal in number, corresponding in position and matching in specifications. The guide blocks and guide grooves are distributed in a circumferential array, and the guide blocks are inserted one by one into the corresponding guide grooves.
[0012] As a further optimization of this utility model, a reset spring is fixedly connected to the top of the inner cavity of the guide groove, the guide block and the guide groove are longitudinally slidably connected, and the bottom end of the reset spring is fixedly connected to the top end of the guide block.
[0013] As a further optimization of this utility model, the bottom of the valve core is provided with a flow guide seat, and the outer wall of the flow guide seat is provided with a flow guide groove, which is spirally wound.
[0014] Compared with the prior art, the beneficial effects of this utility model are:
[0015] In this invention, the suspension component and the guide component can form a double buffer structure. The double buffer structure can absorb a large amount of impact energy, avoid direct damage to the drive components from the impact, and prevent leakage due to misalignment of the sealing surface. Ultimately, it can significantly improve the valve's impact resistance and sealing reliability, extend its service life, and reduce the risk of production interruption and maintenance costs. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0017] Figure 2 This is a cross-sectional view of the valve body of this utility model;
[0018] Figure 3 This is a schematic diagram of the valve core of this utility model;
[0019] Figure 4 This is a cross-sectional view of the valve core of this utility model;
[0020] Figure 5 This is an exploded view of the drive rod of this utility model from an upward perspective;
[0021] Figure 6 This is an exploded view of the driven rod of this utility model;
[0022] Figure 7 This is a cross-sectional view of the guide sleeve of this utility model.
[0023] In the diagram: 1. Valve body; 2. Valve stem; 21. Drive rod; 22. Driven rod; 23. Suspension assembly; 231. Annular magnetic groove; 232. Magnetic sleeve; 233. Magnetic ring; 24. Guide assembly; 241. Guide sleeve; 242. Limiting groove; 243. Guide groove; 244. Limiting block; 245. Guide block; 246. Return spring; 3. Valve core; 31. Flow guide seat; 32. Flow guide groove. Detailed Implementation
[0024] 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.
[0025] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0026] Please see Figures 1-7 This utility model provides a technical solution:
[0027] An impact-resistant shut-off valve includes a valve body 1, a valve stem 2, and a valve core 3. The valve core 3 is adapted to a flow hole inside the valve body 1. The valve stem 2 includes an upper driving rod 21 and a lower driven rod 22. A suspension component 23 is provided between the bottom end of the driving rod 21 and the top end of the driven rod 22. A guide component 24 is provided on the outer side of the bottom end of the driving rod 21 and the top end of the driven rod 22. The suspension component 23 includes an annular magnetic groove 231 opened at the bottom end of the driving rod 21 and the top end of the driven rod 22. A magnetic sleeve 232 and a magnetic ring 233 are embedded in the inner cavity of the annular magnetic groove 231. The outer circular surface of the magnetic ring 233 fits against the inner circular surface of the magnetic sleeve 232, and the outer circular surface of the magnetic sleeve 232 fits against the inner circular surface of the annular magnetic groove 231. The annular magnetic groove 231, the magnetic sleeve 232, and the magnetic ring 233 are all coaxially arranged with the driving rod 21 and the driven rod 22. The opposite surfaces of the two magnetic rings 233 are arranged with the same magnetic poles.
[0028] It should be noted that: the valve body 1 serves as the main frame of the valve, and its internal flow hole is precisely matched with the valve core 3 to ensure that the valve core 3 can completely block the fluid when closed and allow smooth flow when open; the valve core 3 and the driven rod 22 are fixed by threads or welding to form a "driven rod 22-valve core 3" linkage unit, whose action is directly controlled by the valve rod 2. The valve rod 2 is divided into a drive rod 21 (upper, connecting to the handwheel or drive device) and a driven rod 22 (lower, connecting to the valve core 3). The two are not rigidly connected, but achieve "magnetic levitation buffering" through the suspension component 23;
[0029] Furthermore: Annular magnetic grooves 231 are respectively formed at the bottom of the drive rod 21 and the top of the driven rod 22, providing installation space for the magnetic sleeve 232 and the magnetic ring 233; the magnetic sleeve 232 can concentrate the magnetic field of the magnetic ring 233, enhancing the magnetic repulsion force; the magnetic ring 233 (made of neodymium iron boron strong magnetic material) uses oppositely arranged magnetic poles to generate a continuous magnetic repulsion force, allowing the drive rod 21 and the driven rod 22 to maintain a "suspended and separated" state (with a small gap) when there is no external force. The core function of this design is: when fluid impacts the valve core 3 (such as in a pipeline)... During startup, water hammer impact and sudden increase in medium pressure will cause the impact force to be transmitted to the magnetic ring 233 through the driven rod 22. The repulsive force of the same magnetic poles can buffer most of the impact energy, preventing the impact force from being directly transmitted to the drive rod 21 and the upper drive device (such as handwheel or electric actuator), thus preventing the parts from deforming or being damaged. The guide assembly 24 is sleeved on the outside of the drive rod 21 and the driven rod 22 to ensure that the two are always coaxial during the suspension and buffering process, avoiding valve stem 2 offset and jamming caused by impact, and ensuring stable valve opening and closing action.
[0030] As a further implementation of this scheme, the magnetic sleeve 232 and the magnetic ring 233 are at the same height, and the magnetic sleeve 232 and the magnetic ring 233 are flush with the annular magnetic groove 231.
[0031] It should be noted that the magnetic sleeve 232 and the magnetic ring 233 are at the same height, which allows the magnetic field generated by the magnetic ring 233 to be evenly distributed throughout the circumference of the magnetic sleeve 232. This avoids uneven local magnetic field strength caused by height deviation. If the height is inconsistent, the magnetic repulsion will be greater in areas with strong magnetic fields and less in areas with weak magnetic fields, which will cause an imbalance in the force on the driving rod 21 and the driven rod 22. This may cause tilting during buffering and make it difficult to effectively dissipate the impact. At the same time, the uniform magnetic field can distribute the impact energy throughout the circumference, avoiding excessive local force that could cause the magnetic ring 233 to break.
[0032] Furthermore, both the magnetic sleeve 232 and the magnetic ring 233 are flush with the annular magnetic groove 231 (i.e., there are no protrusions or depressions at the top and bottom), which can prevent fluid or impurities from entering the annular magnetic groove 231 (if there are protrusions or depressions, impurities will easily accumulate and affect the magnetism of the magnetic ring 233), maintaining the long-term stability of the magnetic levitation buffer function, and is especially suitable for fluid working conditions containing a small amount of impurities (such as industrial circulating water and low viscosity oil).
[0033] As a further implementation of this solution, the guide assembly 24 includes a guide sleeve 241, which is sleeved on the outer side of the bottom end of the drive rod 21 and the top end of the driven rod 22. The upper part of the inner wall of the guide sleeve 241 has multiple limiting grooves 242, and the lower part of the inner wall of the guide sleeve 241 has multiple longitudinally arranged guide grooves 243. Multiple limiting blocks 244 are fixedly connected to the outer side of the bottom end of the drive rod 21. The limiting blocks 244 and the limiting grooves 242 are equal in number and corresponding in position. Furthermore, the specifications are matched and the limiting blocks 244 and the limiting grooves 242 are both distributed in a circumferential array, and the limiting blocks 244 are inserted into the corresponding limiting grooves 242. Multiple guide blocks 245 are fixedly connected to the outer side of the top end of the driven rod 22. The guide blocks 245 and the guide grooves 243 are equal in number, corresponding in position, and matched in specifications. The guide blocks 245 and the guide grooves 243 are both distributed in a circumferential array, and the guide blocks 245 are inserted into the corresponding guide grooves 243.
[0034] It should be noted that: the guide sleeve 241 is sleeved on the outside of the drive rod 21 and the driven rod 22, and its inner diameter is adapted to the outer diameter of the valve rod 2. It can constrain the radial displacement of the valve rod 2 from the outside to ensure that the magnetic ring 233 of the suspension assembly 23 is always coaxial and opposite.
[0035] Furthermore, the upper limiting groove 242 and the lower guide groove 243 on the inner wall of the guide sleeve 241 form a layered functional area: the limiting groove 242 (in conjunction with the limiting block 244) allows the drive rod 21 to rotate synchronously with the guide sleeve 241 when the opening and closing are adjusted by rotating the handwheel or drive device, providing a basis for the guide sleeve 241 to drive the driven rod 22 and the valve core 3 to rotate synchronously; the longitudinally opened guide groove 243 provides guidance for the longitudinal movement of the driven rod 22 (in conjunction with the guide block 245). When the fluid impacts the valve core 3 and causes the driven rod 22 to move upward, the guide groove 243 can constrain the driven rod 22 to move in a straight line, avoiding the valve core 3 and the flow hole of the valve body 1 to be misaligned due to lateral offset (misalignment exceeding 0.5mm will cause sealing failure). At the same time, it provides stable space for the extension and retraction of the return spring 246, ensuring accurate reset after buffering.
[0036] As a further implementation of this solution, a reset spring 246 is fixedly connected to the top of the inner cavity of the guide groove 243, the guide block 245 is longitudinally slidably connected to the guide groove 243, and the bottom end of the reset spring 246 is fixedly connected to the top end of the guide block 245.
[0037] It should be noted that: the return spring 246 is fixed between the top of the guide groove 243 and the guide block 245. In the initial state, it is in a slightly compressed state, which can help the magnetic levitation assembly 23 maintain the suspension gap between the drive rod 21 and the driven rod 22. When the fluid impacts the valve core 3, the driven rod 22 moves upward, driving the guide block 245 to compress the return spring 246. At this time, the elastic reaction force generated by the return spring 246 and the magnetic repulsion force of the levitation assembly 23 form a "double buffer", which can absorb most of the impact energy and further weaken the impact force on the drive rod 21 and the upper drive device. When the impact disappears, the elastic force and magnetic repulsion force of the return spring 246 work together to push the driven rod 22 downward to reset, ensuring that the valve core 3 quickly returns to the sealing position and avoids continuous fluid leakage due to reset lag.
[0038] As a further implementation of this solution, the bottom of the valve core 3 is provided with a flow guide seat 31, and the outer wall of the flow guide seat 31 is provided with a flow guide groove 32, which is spirally wound.
[0039] It should be noted that the flow guide seat 31 is located at the bottom of the valve core 3, and its outer diameter is slightly smaller than the inner diameter of the flow hole of the valve body 1. The spiral flow guide groove 32 on the outer wall can change the fluid flow trajectory: when the medium impacts, the flow guide groove 32 decomposes the axial impact force into tangential eddy current and radial damping to reduce the water hammer effect, rather than directly impacting the bottom of the valve core 3. Traditional valve core 3 lacks a flow guide structure, and the fluid will directly impact the bottom of the valve core 3. The impact pressure can easily cause the valve core 3 to vibrate and wear. However, through the spiral flow guide, the direct impact pressure of the fluid on the valve core 3 can be reduced, which greatly reduces the damage of the impact to the valve core 3 and the driven rod 22.
[0040] Work process: When the valve needs to be opened, turn the handwheel clockwise (or start the electric device), drive rod 21 rises, and under the constraint of limit block 244 and limit groove 242, drive guide sleeve 241 to move upward, and drive driven rod 22 to rise synchronously, thereby pulling valve core 3 away from the flow hole of valve body 1 (after valve core 3 rises, flow hole opens, fluid can pass normally). At this time, fluid flows upward from the bottom of flow hole. When it flows through the spiral guide groove 32 on the outer wall of guide seat 31, it is forced to turn into spiral upward flow, avoiding direct impact on the bottom of valve core 3. The impact pressure can be reduced by spiral guide, reducing valve core 3 vibration and wear, and reducing flow noise at the same time.
[0041] When the valve needs to be closed, turn the handwheel counterclockwise (or start the electric device), the drive rod 21 moves down, and the magnetic repulsion of the two magnetic rings 233 pushes the driven rod 22 to move down synchronously, thereby pushing the valve core 3 closer to the flow hole of the valve body 1, until the valve core 3 is tightly fitted with the sealing surface of the flow hole (blocking the flow of fluid).
[0042] During the closing process, if a sudden increase in fluid pressure occurs (such as water hammer), the impact force is transmitted to the driven rod 22 through the valve core 3, pushing the driven rod 22 to move upward in the opposite direction. When the driven rod 22 rises, the guide block 245 compresses the return spring 246, and the return spring 246 generates an elastic reaction force. At the same time, the distance between the magnetic rings 233 of the drive rod 21 and the driven rod 22 decreases, and the magnetic repulsion increases. The two work together to absorb most of the impact energy, preventing the impact force from being directly transmitted to the drive rod 21 and the handwheel, and preventing component deformation (such as handwheel breakage or drive rod 21 bending). The guide groove 243 of the guide sleeve 241 constrains the driven rod 22 to move in a straight line, preventing lateral deviation and preventing misalignment between the valve core 3 and the flow hole (misalignment exceeding 0.5mm will cause sealing failure). This ensures that the valve core 3 accurately fits the sealing surface and maintains the sealing performance.
[0043] During stable operation after the valve is closed, the return spring 246 remains slightly compressed. The auxiliary magnetic levitation assembly 23 maintains the suspension gap between the drive rod 21 and the driven rod 22. The guide sleeve 241 constrains the radial offset of the valve stem 2, ensuring that the magnetic ring 233 is always coaxially opposite, avoiding the loss of buffering due to magnetic repulsion imbalance. When the fluid is light, the spiral guide groove 32 of the guide seat 31 can disperse the pressure through tangential eddy currents, reduce the vibration of the valve core 3, and extend the life of the sealing surface. If an extreme impact occurs, the driven rod 22 drives the guide block 245 to compress the return spring 246 to the limit position. At this time, the spacing of the magnetic ring 233 decreases and the magnetic repulsion increases. Together with the reaction force of the return spring 246, they resist the impact and avoid damage to the sealing surface caused by excessive displacement of the valve core 3. After the impact, the elastic force of the return spring 246 and the magnetic repulsion force push the driven rod 22 to reset, and the valve core 3 returns to the sealing position. Normal operation can be restored without manual intervention.
[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. An impact-resistant shut-off valve, comprising a valve body (1), a valve stem (2), and a valve core (3), characterized in that: The valve core (3) is adapted to the flow hole inside the valve body (1). The valve stem (2) includes an upper driving rod (21) and a lower driven rod (22). A suspension component (23) is provided between the bottom end of the driving rod (21) and the top end of the driven rod (22). A guide component (24) is provided on the outer side of the bottom end of the driving rod (21) and the top end of the driven rod (22). The suspension assembly (23) includes an annular magnetic groove (231) formed at the bottom of the drive rod (21) and the top of the driven rod (22). The inner cavity of the annular magnetic groove (231) is fitted with a magnetic sleeve (232) and a magnetic ring (233). The outer circular surface of the magnetic ring (233) is in contact with the inner circular surface of the magnetic sleeve (232), and the outer circular surface of the magnetic sleeve (232) is in contact with the inner circular surface of the annular magnetic groove (231). The annular magnetic groove (231), the magnetic sleeve (232) and the magnetic ring (233) are all coaxially arranged with the drive rod (21) and the driven rod (22). The opposite surfaces of the two magnetic rings (233) are set with the same magnetic poles.
2. The impact-resistant shut-off valve according to claim 1, characterized in that: The magnetic sleeve (232) and the magnetic ring (233) are at the same height, and the magnetic sleeve (232) and the magnetic ring (233) are flush with the annular magnetic groove (231).
3. The impact-resistant shut-off valve according to claim 1, characterized in that: The guide assembly (24) includes a guide sleeve (241), which is sleeved on the outside of the bottom end of the drive rod (21) and the top end of the driven rod (22). The upper part of the inner wall of the guide sleeve (241) is provided with multiple limiting grooves (242), and the lower part of the inner wall of the guide sleeve (241) is provided with multiple longitudinally arranged guide grooves (243).
4. The impact-resistant shut-off valve according to claim 3, characterized in that: Multiple limiting blocks (244) are fixedly connected to the outer side of the bottom end of the drive rod (21). The limiting blocks (244) and the limiting grooves (242) are equal in number, corresponding in position and matching in specifications. The limiting blocks (244) and the limiting grooves (242) are distributed in a circumferential array, and the limiting blocks (244) are inserted one by one into the corresponding limiting grooves (242).
5. The impact-resistant shut-off valve according to claim 3, characterized in that: Multiple guide blocks (245) are fixedly connected to the outer side of the top of the driven rod (22). The guide blocks (245) and guide grooves (243) are equal in number, corresponding in position and matching in specifications. The guide blocks (245) and guide grooves (243) are distributed in a circumferential array, and the guide blocks (245) are inserted into the corresponding guide grooves (243).
6. The impact-resistant shut-off valve according to claim 5, characterized in that: A reset spring (246) is fixedly connected to the top of the inner cavity of the guide groove (243). The guide block (245) is longitudinally slidably connected to the guide groove (243). The bottom end of the reset spring (246) is fixedly connected to the top end of the guide block (245).
7. The impact-resistant shut-off valve according to claim 1, characterized in that: The bottom of the valve core (3) is provided with a flow guide seat (31), and the outer wall of the flow guide seat (31) is provided with a flow guide groove (32), which is spirally wound.