High-resistance variable cross-section passage two-way damping valve

Abstract

This invention provides a high-resistance variable cross-section bidirectional shock-absorbing valve, comprising ventilation valve plates, valve body frames, valve cores, guide rods, and a reset elastic element; two valve body frames are arranged parallel to each other, and the ventilation valve plates are arranged sequentially from top to bottom and in opposite directions between the two valve body frames along the height direction of the valve body frames; a variable cross-section air duct is formed between two adjacent but non-adherent ventilation valve plates, which includes a first air duct, an intermediate constricted air duct, and a second air duct connected in sequence, with the ventilation cross-sectional area of ​​the first and second air ducts being larger than that of the intermediate constricted air duct; a valve core is installed in each of the first and second air ducts. When encountering a shock wave, the valve core can slide to adhere to the ventilation valve plate to block the intermediate constricted air duct. When the shock wave acts, the valve core is adhered to the valve plate by the positive pressure thrust and the negative pressure suction of the air duct, blocking the air duct, achieving bidirectional shock absorption, with no installation direction restriction and fast closing response.

Description

Technical Field

[0001] This invention relates to the field of protective engineering technology, and in particular to a high-resistance variable cross-section bidirectional wave-damping valve. Background Technology

[0002] In protective engineering, blast wave valves are core equipment ensuring the airtightness and ventilation control functions of the project; their performance directly determines the protective engineering's ability to withstand shock waves. Currently, commonly used blast wave valves in the industry mainly include three types: swing-type blast wave valves, hose-type blast wave valves, and explosion-proof overpressure exhaust valves.

[0003] Both the pendulum-type explosion-proof wave valve and the explosion-proof overpressure exhaust valve are gravity-sensitive devices. Their opening and closing depend on gravity, which imposes strict restrictions on the installation method (e.g., the pendulum type needs to be installed vertically to ensure that the valve plate is reset by gravity, and the explosion-proof overpressure exhaust valve needs to be installed horizontally to avoid gravity affecting the overpressure response threshold). They cannot meet the multi-angle installation requirements of complex protection projects.

[0004] The conventional shock-absorbing valves mentioned above can only withstand unidirectional shock waves. When the protective structure encounters a reverse shock wave (such as an explosion reflection wave or a secondary impact), the valves cannot achieve effective sealing, causing the residual pressure of the shock wave to intrude into the interior of the structure, damaging equipment and endangering personnel safety.

[0005] Conventional valves rely on gravity or single overpressure to close, resulting in a long closing time. The residual pressure of the shock wave is prone to leak through the valve gaps during the closing delay, leading to poor shock absorption.

[0006] In view of the above-mentioned shortcomings of the existing technology, there is an urgent need for a wave-damping valve that combines bidirectional wave damping, unlimited installation methods, and rapid closure. Summary of the Invention

[0007] To address the problems of existing explosion-proof wave valves, such as gravity sensitivity, installation limitations, unidirectional wave suppression, slow closing speed, and poor wave suppression effect, the present invention aims to provide a high-resistance variable cross-section bidirectional wave suppression valve. Through the variable cross-section duct design and symmetrical elastic reset structure, it achieves bidirectional wave suppression, no installation direction restrictions, and rapid valve core closure.

[0008] The technical solution adopted in this invention is as follows:

[0009] This invention provides a high-resistance variable cross-section bidirectional wave-damping valve, comprising ventilation valve plates, valve body frames, valve cores, guide rods, and a reset elastic element; the valve body frame includes a connecting plate, baffles, and partitions, with the baffles and partitions connected to the same side of the connecting plate; two baffles are located on opposite sides of the connecting plate, and the partition is located between the two baffles; the two valve body frames are arranged parallel to each other, and the ventilation valve plates are arranged sequentially from top to bottom and in opposite directions along the height of the valve body frames between the two valve body frames; a variable cross-section air duct is formed between two adjacent but non-adhesive ventilation valve plates, the variable cross-section air duct including a first air duct and an intermediate compressed air duct connected sequentially. The system includes a first air duct and a second air duct, both with larger cross-sectional areas than the intermediate constricted air duct. Each of the first and second air ducts has a valve core with sliding holes at both ends, allowing the valve core to be slidably fitted onto the guide rod. The guide rod is connected to a baffle and a partition at both ends. Two reset elastic elements are fitted onto the guide rod, one abutting between the valve core and the baffle, and the other abutting between the valve core and the partition. When encountering a shock wave, the valve core can slide to fit against the ventilation valve plate to block the intermediate constricted air duct.

[0010] According to one embodiment of the present invention, the partition is provided with a plurality of first slots along its own height direction, and the ventilation valve is provided with second slots at both ends that are adapted to the first slots; the second slots at both ends of the ventilation valve are respectively engaged into the first slots of the two partitions, and the two ends of the ventilation valve are clamped between the two baffles.

[0011] According to one embodiment of the present invention, the ventilation valve plate is a folded plate with a groove formed in the middle; when two adjacent ventilation valve plates are arranged in opposite directions, their grooves face each other and together enclose the variable cross-section air duct.

[0012] According to one embodiment of the present invention, a rib is connected to one side of the ventilation valve plate with a groove; end plates are also connected to both ends of the ventilation valve plate located at the rib, and the end plates are fixedly connected to the ventilation valve plate and the rib.

[0013] According to one embodiment of the present invention, it further includes valve body sealing plates; the two valve body sealing plates are respectively fixedly connected to the upper and lower ends of the two valve body frames to close the openings at the upper and lower ends of the valve body frames.

[0014] According to one embodiment of the present invention, the valve core has a streamlined structure with a circular or elliptical tubular cross-section.

[0015] According to one embodiment of the present invention, the reset elastic element is a spring.

[0016] According to one embodiment of the present invention, the baffle and partition are provided with corresponding shaft holes along the horizontal direction, and a plurality of shaft holes are arranged along the height direction of the valve body frame; the two ends of the guide rod are respectively installed in the shaft holes of the baffle and partition.

[0017] According to one embodiment of the present invention, the shaft hole is an internally threaded hole, and both ends of the guide rod are threaded ends, with the threaded ends of the guide rod screwed into the internally threaded hole.

[0018] According to one embodiment of the present invention, both the ventilation valve plate and the valve body frame are formed by casting.

[0019] The high-resistance variable cross-section channel bidirectional wave-damping valve of the present invention has the following beneficial effects:

[0020] I. Two-way high-efficiency wave dissipation, protection without blind spots: This invention, by configuring valve cores in the first and second air ducts of the variable cross-section air duct, combined with the structural design of the variable cross-section air duct where "the cross-sectional area of ​​the first and second air ducts is larger than that of the middle constricted air duct", can simultaneously resist two-way shock waves: When the first or second air duct encounters a shock wave, the positive pressure of the shock wave directly acts on the explosion-facing surface of the valve core on the corresponding side, pushing the valve core to slide inward into the air duct; at the same time, the middle constricted air duct forms a negative pressure due to the sudden increase in airflow velocity, further generating suction on the valve core. Under the synergistic effect of "positive pressure thrust + negative pressure suction", the valve core can quickly slide to fit with the ventilation valve plate, accurately sealing the middle constricted air duct, completely blocking the intrusion of the residual pressure of the shock wave, solving the defect of conventional valves that only provide one-way protection, and is suitable for multi-directional impact risk scenarios.

[0021] II. Fast valve core closing speed and significantly improved wave suppression efficiency: Compared with the conventional single-drive valve, this invention relies on the hydrodynamic characteristics of the variable cross-section duct to provide the valve core with "dual push and pull power": the negative pressure of the middle compressed duct can form an additional suction force on the valve core, which, combined with the thrust of the shock wave positive pressure, greatly shortens the time for the valve core to slide along the guide rod to fit the ventilation valve plate, avoiding leakage of residual shock wave pressure due to closing delay, ensuring wave suppression effect, and protecting the safety of personnel and equipment inside the protection project.

[0022] 3. Installation is not limited by gravity and is suitable for complex construction environments: The driving (positive pressure + negative pressure) and reset (reset elastic element) of the valve core of this invention do not rely on gravity. Unlike conventional swing valves and overpressure exhaust valves, the installation direction is not restricted. The valve body frame (including connecting plate, baffle, partition) can be flexibly installed in the horizontal, vertical or inclined direction according to the spatial layout of the protection project opening, reducing the restrictions of the construction scene and improving the convenience of on-site installation.

[0023] IV. Strong structural resistance and high long-term stability: The valve body frame integrates connecting plates, baffles, and partitions, forming an integrated frame structure with excellent rigidity. The shaft holes on the baffles and partitions correspond one-to-one, providing stable installation support for the guide rod and preventing the guide rod from shaking and affecting the sliding accuracy of the valve core. The ventilation valve plates are arranged in an orderly manner "from top to bottom, one in the positive and one in the negative" along the height direction of the valve body frame, which not only forms a regular variable cross-section air duct, but also enhances the overall structural resistance to deformation. The sliding fit between the guide rod and the valve core, and the design of the resetting elastic element abutting at both ends (valve core and baffle / partition), further improve the stability of component connection, enabling the overall valve to withstand high-intensity shock waves, making it less prone to structural loosening or deformation, and extending the service life of the equipment.

[0024] V. Reliable and automatic reset, timely restoration of ventilation function: The two ends of the reset elastic element abut against the valve core and the baffle / partition respectively. After the shock wave ends, the compressed reset elastic element can quickly release the elastic force, pushing the valve core to accurately return to the initial position along the guide rod, so that the variable cross-section air duct (first air duct, intermediate compressed air duct, second air duct) is restored to smooth flow, ensuring the normal ventilation function of the protective project in the non-impact state. No manual intervention is required for reset, improving the convenience and reliability of equipment use. Attached Figure Description

[0025] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but should not be construed as limiting the invention. In the drawings,

[0026] Figure 1 Assembly diagram of the high-resistance variable cross-section bidirectional wave-damping valve of the present invention;

[0027] Figure 2 : Exploded view of the high-resistance variable cross-section channel bidirectional wave-damping valve of the present invention;

[0028] Figure 3 : A cross-sectional view of the high-resistance variable cross-section channel bidirectional wave-damping valve of the present invention.

[0029] Reference numerals: 1. Ventilation valve plate; 2. Valve body frame; 3. Valve core; 4. Guide rod; 5. Reset elastic element; 6. Valve body sealing plate; 21. Connecting plate; 22. Baffle; 23. Shaft hole; 20. Variable cross-section air duct; 10. First air duct; 101. Intermediate compressed air duct; 102. Second air duct; 103. Second slot; 11. Rib plate; 12. End plate; 13. First slot; 231. Detailed Implementation

[0030] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0031] like Figures 1 to 3 As shown, the present invention provides a high-resistance variable cross-section bidirectional wave-damping valve, including a ventilation valve plate 1, a valve body frame 2, a valve core 3, a guide rod 4, and a reset elastic element 5.

[0032] The valve body frame 2 includes a connecting plate 21 and baffles 22 and partitions 23 connected to one side of the connecting plate 21. The two baffles 22 are located on the two side edges of the connecting plate 21, and the partition 23 is located between the two baffles 22. The baffles 22 and partitions 23 have corresponding shaft holes 20 along the horizontal direction, and multiple shaft holes 20 are arranged along the height direction of the valve body frame 2.

[0033] Two valve body frames 2 are arranged parallel to each other. Ventilation valve plates 1 are arranged sequentially from top to bottom and in opposite directions between the two valve body frames 2 along the height direction of the valve body frames 2. A variable cross-section air duct 10 is formed between two adjacent but non-adherent ventilation valve plates 1. The variable cross-section air duct 10 includes a first air duct 101, an intermediate constricted air duct 102, and a second air duct 103 connected in sequence. The ventilation cross-sectional area of ​​the first air duct 101 and the second air duct 103 is larger than the ventilation cross-sectional area of ​​the intermediate constricted air duct 102.

[0034] Both the first air duct 101 and the second air duct 103 are equipped with a valve core 3. The valve core 3 has sliding holes at both ends, allowing it to be slidably fitted onto the guide rod 4. Two reset elastic elements 5 are fitted onto both ends of the guide rod 4. The guide rod 4 is installed at both ends within the shaft holes 20 of the baffle 22 and the partition 23. One reset elastic element 5 abuts against the valve core 3 and the baffle 22; the other reset elastic element 5 abuts against the valve core 3 and the partition 23. The valve core 3 can block the intermediate constricted air duct 102 when encountering a shock wave.

[0035] When the first air duct 101 or the second air duct 103 encounters a shock wave, the positive pressure of the shock wave acts on the explosion-facing side of the valve core 3, pushing the valve core 3 to slide inward into the air duct. At the same time, the intermediate constricted air duct 102 of the variable cross-section air duct 10 forms a negative pressure due to the sudden increase in airflow velocity, further pulling the valve core 3. Under the combined action of the positive pressure thrust and the negative pressure suction, the valve core 3 slides to fit against the ventilation valve plate 1 to block the intermediate constricted air duct 102, compressing the reset elastic element 5 on the explosion-facing side of the valve core 3, achieving valve sealing and blocking the intrusion of residual shock wave pressure. After the shock wave ends, the compressed reset elastic element 5 can quickly release its elastic force, pushing the valve core 3 precisely back to its initial position along the guide rod 4, restoring the variable cross-section air duct 10 to unobstructed flow and ensuring the normal ventilation function of the protective project under non-impact conditions.

[0036] The high-resistance variable cross-section channel bidirectional wave-damping valve of the present invention has the following beneficial effects:

[0037] I. Two-way high-efficiency wave dissipation, protection without blind spots: This invention, by configuring valve cores 3 in the first air duct 101 and the second air duct 103 of the variable cross-section air duct 10, combined with the structural design of the variable cross-section air duct 10 where "the cross-sectional area of ​​the first air duct 101 and the second air duct 103 is larger than that of the intermediate constricted air duct 102", can simultaneously resist two-way shock waves: When the first air duct 101 or the second air duct 103 encounters a shock wave, the positive pressure of the shock wave directly acts on the explosion-facing surface of the valve core 3 on the corresponding side, pushing the valve core 3 to slide inward into the air duct; at the same time, the intermediate constricted air duct 102 forms a negative pressure due to the sudden increase in airflow velocity, further generating suction on the valve core 3. Under the synergistic effect of "positive pressure thrust + negative pressure suction", the valve core 3 can quickly slide to fit with the ventilation valve plate 1, accurately sealing the intermediate constricted air duct 102, completely blocking the intrusion of the residual pressure of the shock wave, solving the defect of conventional valves that only provide one-way protection, and is suitable for multi-directional impact risk scenarios.

[0038] II. Fast valve core closing speed and significantly improved wave suppression efficiency: Compared with the conventional single-drive valve, this invention relies on the hydrodynamic characteristics of the variable cross-section duct 10 to provide "dual push and pull power" for the valve core 3: the negative pressure of the intermediate compressed duct 102 can form an additional suction force on the valve core 3, which, combined with the thrust of the shock wave positive pressure, greatly shortens the time for the valve core 3 to slide along the guide rod 4 to fit the ventilation valve plate 1, avoiding leakage of residual shock wave pressure due to closing delay, ensuring wave suppression effect, and protecting the safety of personnel and equipment inside the protection project.

[0039] 3. Installation is not limited by gravity and is suitable for complex construction environments: The driving (positive pressure + negative pressure) and resetting (resetting elastic element 5) of the valve core 3 of this invention do not rely on gravity. Unlike conventional swing valves and overpressure exhaust valves, the installation direction is not restricted. The valve body frame 2 (including connecting plate 21, baffle 22, partition 23) can be flexibly installed in the horizontal, vertical or inclined direction according to the spatial layout of the protective project opening, reducing the restrictions of the construction scene and improving the convenience of on-site installation.

[0040] IV. Strong structural resistance and high long-term stability: The valve body frame 2 integrates a connecting plate 21, a baffle 22, and a partition 23, forming an integrated frame structure with excellent rigidity. The shaft holes 20 on the baffle 22 and the partition 23 correspond one-to-one, providing stable installation support for the guide rod 4 and preventing the guide rod 4 from shaking and affecting the sliding accuracy of the valve core 3. The ventilation valve plate 1 is arranged in an orderly manner "from top to bottom, positive and negative" along the height direction of the valve body frame 2, which not only forms a regular variable cross-section air duct 10, but also enhances the overall structural resistance to deformation. The sliding fit between the guide rod 4 and the valve core 3, and the design of the resetting elastic element 5 abutting at both ends (valve core 3 and baffle 22 / partition 23) further improve the stability of component connection, making the overall valve able to withstand high-intensity shock waves, less prone to structural loosening or deformation, and extending the service life of the equipment.

[0041] V. Reliable and automatic reset, timely restoration of ventilation function: The two ends of the reset elastic element 5 abut against the valve core 3 and the baffle 22 / partition 23 respectively. After the shock wave ends, the compressed reset elastic element 5 can quickly release the elastic force, pushing the valve core 3 to accurately return to the initial position along the guide rod 4, so that the variable cross-section air duct 10 (first air duct 101, intermediate compressed air duct 102, second air duct 103) is restored to smooth flow, ensuring the normal ventilation function of the protective project in the non-impact state, without the need for manual intervention to reset, improving the convenience and reliability of equipment use.

[0042] In this embodiment, the shaft hole 20 is an internal threaded hole, and both ends of the guide rod 4 are threaded ends, with the threaded ends of the guide rod 4 screwed into the internal threaded hole.

[0043] In this embodiment, the partition 23 has multiple first slots 231 along its height. The ventilation valve plate 1 has second slots 11 at both ends that are adapted to the first slots 231. The second slots 11 at both ends of the ventilation valve plate 1 engage with the first slots 231 of the two partitions 23. The ventilation valve plate 1 is held between two baffles 22.

[0044] The use of the first slot 231 and the second slot 11 to install the partition 23 and the ventilation valve plate 1 has the following beneficial effects:

[0045] I. More Reliable Fixing of Ventilation Valve Plates and Significantly Improved Stability of Variable Cross-Section Air Duct Form: This invention utilizes the first slot 231 of the partition 23 to fit and engage with the second slot 11 of the ventilation valve plate 1, while simultaneously clamping both ends of the ventilation valve plate 1 between two baffles 22, forming a dual fixing structure of "slot positioning + two-sided clamping": the precise engagement of the first slot 231 and the second slot 11 restricts the horizontal displacement of the ventilation valve plate 1; the clamping effect of the two baffles 22 constrains the vertical swaying of the ventilation valve plate 1. This fixing method ensures that the ventilation valve plate 1 is not easily loosened or shifted under long-term ventilation or shock wave action, always maintaining the design form of the variable cross-section air duct 10 formed by adjacent ventilation valve plates 1, avoiding negative pressure failure or airflow leakage due to air duct deformation, and providing a stable air duct foundation for the rapid closing and efficient wave elimination of the valve core 3.

[0046] II. Significantly Improved Assembly Efficiency and Reduced Construction Difficulty: Compared to traditional valves that use bolts to fix the ventilation valve plates, the ventilation valve plate 1 of this invention only needs to be initially positioned by "aligning the second slot 11 with the first slot 231 of the partition 23," and then secured stably with the natural clamping of the two baffles 22. The assembly process does not require specialized tools or precise adjustments, allowing construction personnel to quickly complete the installation of single or even multiple ventilation valve plates 1, significantly shortening the assembly time between the valve body frame 2 and the ventilation valve plate 1, and reducing on-site construction complexity and labor costs.

[0047] In this embodiment, the ventilation valve plate 1 is a folded plate with a groove formed in the middle. The two folded plates are arranged in opposite directions to form a variable cross-section air duct 10.

[0048] The ventilation valve plate 1 is designed as a folded plate structure with a central groove. When arranged in an orderly manner with "one upright and one reversed" along the height direction of the valve body frame 2, the groove contour of the folded plate can directly define the core shape of the variable cross-section air duct 10—the groove of the upright folded plate is opposite to the groove of the inverted folded plate, which can accurately form the first air duct 101, the intermediate compact air duct 102, and the second air duct 103 connected in sequence. Moreover, by presetting the depth and width of the folded plate groove, the ventilation cross-sectional area of ​​the first air duct 101 and the second air duct 103 can be strictly controlled to be larger than the size of the intermediate compact air duct 102. This integrated folded plate forming method avoids the dimensional deviation and joint misalignment problems that are easy to occur when splicing multiple flat plates into air ducts in traditional methods. It ensures that the hydrodynamic characteristics (airflow velocity change, negative pressure formation intensity) of the variable cross-section air duct 10 are stable and consistent, providing a precise air duct structure foundation for the reliable formation of negative pressure in the intermediate compact air duct 102 and the coordinated push of the valve core 3 to close quickly when subjected to shock wave action.

[0049] On the one hand, the inner wall of the folded plate structure of the ventilation valve plate 1 is smooth, without any extra protrusions or seams, which can reduce the flow resistance of airflow in the variable cross-section air duct 10 during normal ventilation, ensuring smooth airflow in the first air duct 101 and the second air duct 103, and improving the overall ventilation efficiency. On the other hand, the intermediate constricted air duct 102 formed by the positive and negative folded plates can accurately achieve the fluid effect of "sudden increase in airflow velocity - formation of negative pressure" when the shock wave is applied: the narrow cross-section of the intermediate constricted air duct 102 can quickly increase the airflow velocity, thereby forming a stable negative pressure, which works in conjunction with the positive pressure of the shock wave on the valve core 3, pushing the valve core 3 to quickly fit the ventilation valve plate 1 to block the air duct, which not only ensures the low wind resistance requirement for daily ventilation, but also enhances the wave-damping response speed during impact, achieving efficient synergy between ventilation and wave-damping functions.

[0050] The "grooved folded plate" of the ventilation valve plate 1 can be mass-produced through integrated processing technologies such as stamping and casting. The processing flow is simple and the precision is easy to control. Compared with the traditional design of forming air ducts by splicing multiple parts, it reduces the number of parts and assembly seams, which not only reduces processing and material costs, but also avoids problems such as airflow leakage (during normal ventilation) or shock wave residual pressure intrusion (during wave dissipation) caused by gaps between multiple parts. At the same time, when the folded plates are arranged in opposite directions, the edges of adjacent ventilation valve plates 1 can be tightly fitted by the clamping of the baffle 22 of the valve body frame 2, further reducing the gap of the air duct sidewalls and improving the overall sealing performance of the variable cross-section air duct 10, thus taking into account both product economy and reliability.

[0051] In this embodiment, a rib plate 12 is connected to one side of the ventilation valve plate 1 with a groove to improve structural rigidity and enhance resistance to impact deformation. End plates 13 are connected to both ends of the ventilation valve plate 1 at the rib plate 12 to further improve structural rigidity and enhance resistance to impact deformation.

[0052] In this embodiment, the high-resistance variable cross-section bidirectional wave-damping valve of the present invention includes a valve body sealing plate 6, and two valve body sealing plates 6 are fixedly connected to the upper and lower ends of two valve body frame 2 respectively by bolts.

[0053] In this embodiment, the valve core 3 has a streamlined structure with a circular or elliptical tubular cross-section. In this embodiment, the reset elastic element 5 is a spring.

[0054] In this embodiment, both the ventilation valve plate 1 and the valve body frame 2 are made by casting.

[0055] Multiple shock-absorbing valves can be arranged side by side in the horizontal or vertical direction, and the valve body frames 2 of adjacent shock-absorbing valves are fixedly connected by bolts.

[0056] Any combination of various embodiments of the present invention, provided it does not violate the inventive concept of the present invention, shall be regarded as the content disclosed by the present invention; within the scope of the technical concept of the present invention, any simple modifications to the technical solution and any combination of different embodiments that do not violate the inventive concept of the present invention shall be within the protection scope of the present invention.

Claims

1. A high resistance variable area two-way damped flapper valve characterized by, Including ventilation valve piece (1), valve body frame (2), valve core (3), guide rod (4) and reset elastic element (5); The valve body frame (2) includes a connecting plate (21), a baffle (22) and a partition plate (23), the baffle (22) and the partition plate (23) are connected to the same side of the connecting plate (21); two baffles (22) are located on the two side edges of the connecting plate (21), and the partition plate (23) is located between the two baffles (22); two valve body frames (2) are arranged in parallel, the ventilation valve pieces (1) are arranged in the height direction of the valve body frame (2) from top to bottom, and the ventilation valve pieces (1) are arranged in the height direction of the valve body frame (2) from top to bottom; two adjacent ventilation valve pieces (1) form a variable cross-section air duct (10), the variable cross-section air duct (10) includes a first air duct (101), an intermediate narrow air duct (102) and a second air duct (103) which are sequentially communicated, and the ventilation cross-sectional areas of the first air duct (101) and the second air duct (103) are greater than that of the intermediate narrow air duct (102); The first air duct (101) and the second air duct (103) are each provided with a valve core (3), both ends of the valve core (3) are provided with sliding holes, and the valve core (3) is slidably sleeved on the guide rod (4) through the sliding holes; both ends of the guide rod (4) are connected with the baffle (22) and the partition plate (23) respectively; two reset elastic elements (5) are sleeved on both ends of the guide rod (4), one reset elastic element (5) is abutted between the valve core (3) and the baffle (22), and the other reset elastic element (5) is abutted between the valve core (3) and the partition plate (23); the valve core (3) can be slid to be attached to the ventilation valve piece (1) when encountering a shock wave, so as to block the intermediate narrow air duct (102).

2. The high-resistance variable-area two-way damped flapper valve according to claim 1, characterized in that, The partition plate (23) is provided with a plurality of first clamping grooves (231) in the height direction of the partition plate (23), and both ends of the ventilation valve piece (1) are provided with second clamping grooves (11) matched with the first clamping grooves (231); the second clamping grooves (11) at both ends of the ventilation valve piece (1) are clamped into the first clamping grooves (231) of two partition plates (23), and both ends of the ventilation valve piece (1) are clamped between the two baffles (22).

3. The high-resistance variable-area two-way damped flap according to claim 1 or 2, characterized in that The ventilation valve piece (1) is a folding plate with a groove formed in the middle; when two adjacent ventilation valve pieces (1) are arranged in one positive and one negative, the grooves of the two are opposite, and together form the variable cross-section air duct (10).

4. The high resistance variable cross-section passage bi-directional damping flap of claim 3, wherein, One side of the ventilation valve piece (1) provided with a groove is connected with a rib plate (12); both ends of the rib plate (12) on the ventilation valve piece (1) are also connected with end plates (13), and the end plates (13) are fixedly connected with the ventilation valve piece (1) and the rib plate (12).

5. The high-resistance variable-area two-way damped flapper valve according to claim 1, wherein It also includes a valve body sealing plate (6); two valve body sealing plates (6) are fixedly connected with the upper and lower ends of the two valve body frames (2) respectively, so as to close the openings of the upper and lower ends of the valve body frame (2).

6. The high-drag variable-area two-way damped flapper according to claim 1, wherein, The cross section of the valve core (3) is a streamline structure of circular tube or elliptical tube.

7. The high-drag variable-area two-way damped flapper according to claim 1, wherein The reset elastic member (5) is a spring.

8. The high-drag variable-area ducted two-way chopper damper of claim 1, wherein, A corresponding shaft hole (20) is formed on the baffle (22) and the partition plate (23) in the horizontal direction, and a plurality of shaft holes (20) are arranged along the height direction of the valve body frame (2); the both ends of the guide rod (4) are correspondingly installed in the shaft holes (20) of the baffle (22) and the partition plate (23).

9. The high-resistance variable-area two-way damped flapper valve according to claim 8, characterized in that, The shaft hole (20) is an internal thread hole, the both ends of the guide rod (4) are threaded ends, and the threaded ends of the guide rod (4) are screwed in the internal thread hole.

10. The high-drag variable-area ducted two-way chopper damper of claim 1, wherein, The ventilation valve plate (1) and the valve body frame (2) are both cast formed.

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