Fire-fighting air valve structure

Abstract

The invention discloses a fire-fighting air valve structure, and relates to the technical field of fire-fighting air valves. The fire-fighting air valve structure comprises a valve frame, mounting boxes with opposite openings are fixedly connected to an upper wall plate and a lower wall plate of the valve frame in an embedded mode, a plurality of blade shafts are rotationally connected between the two mounting boxes at equal intervals, a pull rod and the lower end face of the valve frame are jointly and fixedly connected with a tension spring, and linkage units are jointly arranged between blades. The pin tongue part, the pin seat part, the limiting and locking mechanism and the sleeving and locking mechanism cooperate with one another to conduct multi-stage locking on the blade so as to ensure normal sealing between the blade and the valve frame, and through cooperation of the pin tongue part, the pin seat part, the limiting and locking mechanism and the sleeving and locking mechanism, multi-stage limiting and forced locking of the blade are achieved; and meanwhile, the sleeve locking mechanism carries out wrapping type locking on the upper sides and the lower sides of the blades, the connecting positions of the blades and the valve frame are effectively pressed, gaps caused by thermal deformation are prevented, and the overall smoke blocking and fireproof performance under the fire disaster working condition is enhanced.

Description

Technical Field

[0001] This invention relates to the field of fire-fighting air valve technology, specifically a fire-fighting air valve structure. Background Technology

[0002] Fire dampers are fire-prevention devices installed in building ventilation ducts. In the event of a fire, they close to prevent flames and smoke from spreading along the duct, thus controlling the spread of fire and protecting the safety of evacuation routes. They are commonly used in high-rise buildings, underground garages, shopping malls, subways, hospitals, and other places that require ventilation, air conditioning, and smoke exhaust systems. Fire dampers can be divided into several types according to their functions. The normally open smoke exhaust fire damper is a typical type. Normally open smoke exhaust fire dampers are open to allow normal airflow. In the event of a fire, the damper initially opens to exhaust toxic smoke. When the smoke temperature rises to about 280°C, the fusible component in the actuator of the damper melts due to heat, causing the blades to close automatically, cutting off the high-temperature smoke passage and preventing it from flowing into other areas and causing secondary combustion that expands the fire.

[0003] The driving force for the closure of the blades in existing fire-fighting damper structures mainly comes from the synergistic action of the actuator and the tension spring. However, in high-temperature environments, the actuator and the tension spring are easily affected by thermal expansion and contraction, leading to performance degradation. For example, the locking components in the actuator are prone to deformation due to thermal expansion, resulting in weakened locking force or even failure. The spring may lose its elasticity due to thermal fatigue, causing the blades to close loosely and not fit properly, resulting in insufficient sealing pressure. In this case, gaps are easily generated between the blades, and smoke and toxic gases can leak through these gaps and enter other fire compartments, accelerating the spread of fire. To improve high-temperature reliability, although some damper designs use a double locking structure (such as a snap ring combined with a mechanical pin) to enhance stability, or increase the number of tension springs to enhance the blade closure force, the overall improvement effect is still limited because the sealing pressure still mainly relies on the single source of the tension spring. It is difficult to completely eliminate the sealing leakage problem in high-temperature environments.

[0004] In addition, most current damper structures use a fitted design for the connection between the blades and the valve body. While this can achieve a good seal at room temperature, in a fire, due to factors such as thermal expansion and deformation and smoke impact, tiny gaps may appear at the joint, allowing smoke to escape from the interface and further reducing the damper's smoke-blocking ability. Summary of the Invention

[0005] This invention provides a fire-fighting damper structure that solves the problem that in existing fire-fighting dampers, the driving force for blade closure mainly relies on the synergistic effect of the actuator and the tension spring. However, in high-temperature environments, the actuator is prone to deformation and failure of the locking components due to thermal expansion, and the tension spring may also lose its elasticity due to thermal fatigue. This results in the blades not closing tightly, insufficient sealing force, and gaps that lead to smoke leakage, weakening the smoke-blocking effect. Although some designs improve stability by using double locking or increasing the number of tension springs, the improvement effect is limited because the sealing and clamping force still mainly relies on the tension spring. It is difficult to fundamentally solve the sealing problem under high temperatures. Furthermore, the current blades and valve body are mostly connected in close contact, which can easily produce minute leaks under thermal expansion deformation or smoke impact during a fire, further affecting the smoke-blocking performance of the damper.

[0006] This invention provides a fire-fighting air valve structure, including a valve frame. Mounting boxes with opposite openings are embedded and fixedly connected to the upper and lower walls of the valve frame. Several blade shafts are equidistantly rotatably connected between the two mounting boxes. Each blade shaft has blades fixedly connected to its exterior. An actuator is provided on the upper surface of the valve frame, which is drivenly connected to the blade shaft located in the middle to control the opening and closing of the blades. The lower end of the blade shaft located in the middle passes through the mounting box and is fixedly connected to a pull rod. A tension spring is fixedly connected to the pull rod and the lower surface of the valve frame. A linkage unit is provided between the blades. Each blade has a pin tongue at its front and a pin seat at its rear. Adjacent blades... The pin tongue and pin seat on the blade complement each other and engage to lock the closed blade in a primary locking connection. A limiting locking mechanism is provided between the upper mounting box and the blade shaft to lock the blade shaft and indirectly lock the closed blade in a secondary locking connection. A sleeve locking mechanism is provided between the two mounting boxes to slide and fit on the upper and lower parts of the closed blade. The sleeve locking mechanism enhances the sealing between the blade and the valve frame and provides a tertiary locking of the blade. The pin tongue, pin seat, limiting locking mechanism and sleeve locking mechanism work together to provide multi-level locking of the blade to ensure proper sealing between the blade and the valve frame.

[0007] In one possible implementation, the locking mechanism includes a C-shaped ring fixedly connected to the outer wall of the blade shaft and located in the upper part of the mounting box cavity, several fixed rings fixedly connected at equal intervals between the front and rear cavity walls of the mounting box by connecting rods, and a pin slidably connected in the fixed ring for engaging with the opening of the C-shaped ring. A compression spring is fixedly connected between the pin and the fixed ring. Two guide grooves are symmetrically opened on the outer wall of the pin, each running along its own axis. Two guide blocks slidably fixedly connected in the guide grooves are symmetrically fixed to the inner wall of the fixed ring.

[0008] In one possible implementation, the locking mechanism includes two rectangular plates that are slidably connected in the mounting box and movably sleeved on the outside of the blade shaft. A top spring is fixedly connected between the rectangular plates and the mounting box. An embedding groove is provided on the opposite side of the two rectangular plates, and the shape of the embedding groove matches the cross-sectional shape of the blade after rotation and closure.

[0009] In one possible implementation, the pin tongue includes several pins that are equidistantly fixed to the front of the right end face of the blade, and each pin has an annular groove on its exterior.

[0010] In one possible implementation, the pin seat includes several pin sleeves that are equidistantly fitted and fixedly connected to the rear of the blade and correspond one-to-one with the pin post. The pin sleeves have openings facing left, and several grooves are equidistantly formed on the inner circumference of the pin sleeves. A spring is fixedly connected to the right wall of each groove. A limit spring is fixedly connected between the spring and the groove. A V-shaped locking plate for engaging with the annular groove is fixedly connected to the left side of the spring.

[0011] In one possible implementation, a push pin is fixedly connected to the front of the outer wall of the insertion post, and a slide rod is slidably connected to the front cavity wall of the upper mounting box, with the left end of the slide rod penetrating the left wall panel of the mounting box, and several wedge-shaped blocks for cooperating with the push pin are fixedly connected at equal intervals to the rear of the slide rod.

[0012] In one possible implementation, a cable is slidably connected to the left side wall of both mounting boxes, and two guide wheels are rotatably connected to the front cavity wall of each mounting box. The cable is located at the right end of the inner cavity section of the mounting box, splits into two along the left-to-right direction, passes through the outside of the guide wheels, and is fixedly connected to the rectangular plate.

[0013] In one possible implementation, the linkage unit includes a connecting rod fixedly connected to the left end face of the blade, with a linkage rod hinged to the front end of the connecting rod.

[0014] In one possible implementation, baffles are fixedly connected to both the left and right walls of the valve frame, a pin tongue is installed at the rear of the baffle on the left, and a pin seat is installed on the baffle on the right.

[0015] As can be seen from the above technical solutions, the present invention has the following advantages: In this invention, the pin tongue, pin seat, limiting locking mechanism and sleeve locking mechanism are combined to perform multi-level limiting and forced locking on the closed blades, ensuring that each blade can be tightly pressed and attached together, which significantly enhances the sealing reliability of the blades in high-temperature environments, avoids the failure of blades due to high temperatures, and improves the overall smoke and fire resistance.

[0016] In this invention, the two vertically distributed rectangular plates in the locking mechanism cooperate with each other, so that the embedded grooves driven by each plate can wrap and lock the closed blade from both the top and bottom directions. This achieves structural compression and wrapping at the connection between the blade and the valve frame, reduces gaps caused by thermal deformation, ensures sealing in a fire, and further enhances smoke blocking and fire prevention performance. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0018] Figure 1 This is a front view schematic diagram of the fire-fighting air valve structure provided by the present invention.

[0019] Figure 2 This is a rear view schematic diagram of the fire-fighting air valve structure provided by the present invention.

[0020] Figure 3 Provided by the present invention Figure 2 An enlarged schematic diagram of part A of the structure.

[0021] Figure 4 This is a cross-sectional view of the pin sleeve installation structure provided by the present invention.

[0022] Figure 5 A cross-sectional view of the valve frame and mounting box connection structure provided by the present invention.

[0023] Figure 6 This is a schematic diagram of the split structure when the blade is closed and engaged with the rectangular plate, as provided by the present invention.

[0024] Figure 7 This is a schematic diagram of the installation structure of the locking mechanism provided by the present invention from a rear-view perspective.

[0025] Figure 8 Provided by the present invention Figure 7 An enlarged schematic diagram of part B of the structure.

[0026] Figure 9 This is a cross-sectional schematic diagram of the connection structure between the insert and the fixing ring provided by the present invention.

[0027] The above figures include the following reference numerals: 1. Valve frame; 2. Mounting box; 3. Impeller shaft; 4. Blade; 5. Pin tongue; 51. Pin post; 52. Annular groove; 6. Pin seat; 61. Pin sleeve; 62. Spring; 63. V-shaped retaining plate; 7. Limiting locking mechanism; 71. C-shaped ring; 72. Fixing ring; 73. Insert post; 74. Pulley post; 75. Slide rod; 76. Wedge block; 8. Locking mechanism; 81. Rectangular plate; 82. Embedded groove; 83. Cable; 84. Guide wheel; 9. Connecting rod; 10. Linkage rod; 11. Baffle; 12. Actuator. Detailed Implementation

[0028] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0029] Please see Figure 1 , Figure 2 and Figure 5 This invention provides a technical solution: a fire-fighting air valve structure, including a valve frame 1. Mounting boxes 2 with opposite openings are embedded and fixedly connected to the upper and lower walls of the valve frame 1. Several blade shafts 3 are rotatably connected at equal intervals between the two mounting boxes 2. Each blade shaft 3 has a blade 4 fixedly connected to its exterior. An actuator 12 is provided on the upper surface of the valve frame 1, which is driven by the blade shaft 3 located in the middle to control the opening and closing of the blades 4. The actuator 12 is a structure found on existing air valves. The lower end of the blade shaft 3 located in the middle passes through the mounting box 2 and is fixedly connected to a pull rod. A tension spring is fixedly connected to the lower surface of the valve frame 1 along with the pull rod. A linkage unit is provided between the blades 4. The linkage unit includes a connecting rod 9 fixedly connected to the left end face of the blade 4. A linkage rod 10 is hinged to the front end of the connecting rod 9. The front part of each blade 4... Each blade 4 is equipped with a pin tongue 5, and each blade 4 is equipped with a pin seat 6 at its rear. The pin tongue 5 and pin seat 6 on two adjacent blades 4 complement each other and engage to lock the blade 4 in a first-level locking connection after it is closed. A limiting locking mechanism 7 is provided between the upper mounting box 2 and the blade shaft 3. The limiting locking mechanism 7 is used to lock the blade shaft 3, thereby indirectly locking the closed blade 4 in a second-level locking. A sleeve locking mechanism 8 is provided between the two mounting boxes 2 for slidingly fitting on the upper and lower parts of the closed blade 4. The sleeve locking mechanism 8 is used to enhance the sealing between the blade 4 and the valve frame 1 and to lock the blade in a third level. The pin tongue 5, pin seat 6, limiting locking mechanism 7 and sleeve locking mechanism 8 work together to lock the blade 4 in multiple levels to ensure the normal closure between the blade 4 and the valve frame 1.

[0030] Please see Figure 2 , Figure 3and Figure 4 In this embodiment, the pin tongue 5 includes several pins 51 that are equidistantly fixed to the front of the right end of the blade 4. Each pin 51 has an annular groove 52 on its outside. The pin seat 6 includes several pin sleeves 61 that are equidistantly embedded and fixed to the rear of the blade 4 and correspond one-to-one with the pins 51. The pin sleeves 61 have their openings facing left. Several grooves are equidistantly formed on the inner circumference of the pin sleeves 61. A spring 62 is fixedly connected to the right groove wall of each groove. A limit spring is fixedly connected between the spring 62 and the groove. A V-shaped locking plate 63 for engaging with the annular groove 52 is fixedly connected to the left side of the spring 62.

[0031] Please see Figure 1 and Figure 2 Both the left and right walls of the valve frame 1 are fixedly connected with baffles 11. A pin tongue 5 is also installed on the rear part of the baffle 11 on the left side, and a pin seat 6 is also installed on the baffle 11 on the right side.

[0032] When the actuator 12 is activated to release the lock on the central blade shaft 3, the tension spring pulls the central blade shaft 3 to rotate. The blade shaft 3 then drives the blade 4 to rotate counterclockwise. The central blade 4 then drives the linkage rod 10 to move via the connecting rod 9. The connecting rod then drives the remaining blades 4 to rotate synchronously via the connecting rod 9 until the blades 4 rotate 90 degrees around the blade shaft 3, and the two adjacent blades 4 are in contact with each other. At the same time, the blade 4 drives the pin 51 to insert into the pin sleeve 61 located on its adjacent blade 4. The V-shaped retaining plate 63 is embedded in the annular groove 52 under the elastic working force of the spring 62 and the limiting spring, so that the pin 51 and the pin sleeve 61 are locked together. To enhance the sealing between adjacent blades 4, the blades 4 located on the left and right sides rotate and close, then adhere to the baffle 11. The pin seat 6 on the left blade 4 engages with the pin tongue 5 installed on the left baffle 11, and the pin tongue 5 on the right blade 4 engages with the pin seat 6 installed on the right baffle 11. The size and tension coefficient of the tension spring are obtained by those skilled in the art through multiple tests based on the tension required for the blades 4 to close. The selection of the tension spring can be adjusted by those skilled in the art to ensure that the tension of the tension spring can meet the force required for the blades to close, thereby ensuring that each blade 4 can fit tightly together.

[0033] When the blade 4 needs to be reset after the fireproofing is completed, the handle on the actuator 12 is manually turned to drive the blade shaft 3 in the middle to rotate clockwise. The blade shaft 3 then drives the blade 4 to rotate. The blade 4 then drives the remaining blades 4 to rotate through the connecting rod 9 and the linkage rod 10. During the clockwise rotation reset process of the blade 4, the pin 51 is gradually pulled out of the pin sleeve 61. As the pin 51 moves outward, it squeezes the inclined surface of the V-shaped clamping plate 63, causing the V-shaped clamping plate 63 to move away from the axis of the pin sleeve 61. Then, the annular groove 52 separates from the V-shaped clamping plate 63, and finally the pin 51 can be completely pulled out of the pin sleeve 61.

[0034] Please see Figure 7 , Figure 8 and Figure 9 In this embodiment, the locking mechanism 7 includes a C-shaped ring 71 fixedly connected to the outer wall of the blade shaft 3 and located in the upper part of the inner cavity of the mounting box 2, several fixed rings 72 fixedly connected at equal intervals between the front and rear cavity walls of the mounting box 2 by connecting rods, and a pin 73 slidably connected in the fixed rings 72 for engaging with the opening of the C-shaped ring 71. The pin 73 is located on the left side of the blade shaft 3. Two guide grooves are symmetrically opened on the outer wall of the pin 73, each running along its own axis. Two guide blocks are symmetrically fixedly connected to the inner wall of the fixed rings 72 and slidably disposed in the guide grooves. A compression spring is fixedly connected between the pin 73 and the fixed rings 72. A lever 74 is fixedly connected to the front part of the outer wall of the pin 73. A sliding rod 75 is slidably connected to the front cavity wall of the upper part of the mounting box 2, and the left end of the sliding rod 75 penetrates through the left wall panel of the mounting box 2. Several wedge-shaped blocks 76 for engaging with the lever 74 are fixedly connected at equal intervals to the rear part of the sliding rod 75.

[0035] The opening of the C-ring 71 is initially located directly behind the blade shaft 3. When the blade shaft 3 rotates and drives the blade 4 to close, the C-ring 71 will be driven to rotate counterclockwise in sync. When the blade 4 rotates 90 degrees to close, the C-ring 71 also rotates 90 degrees counterclockwise with the blade shaft 3. At this time, the opening of the C-ring 71 is located directly below the insert 73. Then, under the pull of the compression spring, the insert 73 moves downward and inserts into the notch of the C-ring 71, locking and limiting the rotated blade shaft 3, thereby indirectly limiting the closed blade 4, ensuring that the closed blades 4 can fit together securely.

[0036] When the blade 4 needs to be reset after fireproofing, manually push the slide bar 75 to the right. The slide bar 75 then moves the wedge block 76. During the movement of the wedge block 76 to the right, its inclined surface abuts against the outer wall of the push post 74, and then pushes the push post 74 upward. The push post 74 then moves the insertion post 73 upward, so that the insertion post 73 moves out of the notch of the C-ring 71. At this time, the push post 74 abuts against the upper plane of the wedge block 76. Then the blade shaft 3 can rotate normally to reset the blade 4. After the blade shaft 3 drives the C-ring 71 to reset to the initial position, pull the slide bar 75 to the left to move the wedge block 76 to the left. The wedge block 76 then separates from the push post 74.

[0037] Please see Figure 1 , Figure 5 and Figure 6 In this embodiment, the locking mechanism 8 includes two rectangular plates 81 that are slidably connected in the mounting box 2 and movably sleeved on the outside of the blade shaft 3. A top spring is fixedly connected between the rectangular plates 81 and the mounting box 2. An embedding groove 82 is provided on the opposite side of the two rectangular plates 81. The shape of the embedding groove 82 matches the cross-sectional shape of the blade 4 after rotation and closure. A pull cable 83 is slidably connected to the left wall of the two mounting boxes 2. Two guide wheels 84 are rotatably connected to the front cavity wall of the mounting box 2. The pull cable 83 is located at the right end of the inner cavity section of the mounting box 2 and is divided into two parts along the left-to-right direction, passing through the outside of the guide wheel 84 and fixedly connected to the rectangular plate 81.

[0038] When blade 4 is open, it is perpendicular to the longitudinal section of rectangular plate 81. At this time, the two rectangular plates 81, under the action of the top spring, respectively contact and adhere to the upper and lower sides of blade 4. After blade 4 rotates and closes, blade 4 is parallel to the longitudinal section of rectangular plate 81, and the upper and lower sides of the rotated blade 4 coincide with the insertion groove 82. Since the path shape of the insertion groove 82 matches the cross-section of the blade 4 after they are attached together, the top spring pushes the two rectangular plates 81 to move closer to each other. The rectangular plates 81 then drive the insertion groove 82 to fit over the upper and lower sides of the closed blade 4. (The specific fit between blade 4 and insertion groove 82 is as follows...) Figure 6 As shown, the upper and lower sides of the blade 4 are covered respectively, which indirectly enhances the sealing between the upper and lower sides of the blade 4 and the valve frame 1, and locks and limits the blade 4 again to ensure that each blade 4 can fit together securely.

[0039] When the locking mechanism 8 needs to release the lock on the blade 4 and the blade 4 needs to be reset, the pin 74 in the locking mechanism 7 is in contact with the upper plane of the wedge block 76. Therefore, the locking mechanism 7 is in the unlocked state for the blade. Then, manually pull the cable 83 to the left. The cable 83 then drives the guide wheel 84 to rotate, and then drives the rectangular plate 81 connected to the end of the cable 83 to move. Pull the two rectangular plates 81 away from each other, so that the rectangular plates 81 retract into the corresponding mounting box 2. The rectangular plates 81 then drive the embedded groove 82 to separate from the blade 4, so that the blade 4 can rotate normally. After the blade 4 rotates to the open position, the cable 83 can be released. Finally, pull the slide bar 75 to the left to separate the wedge block 76 from the pin 74. The pin 73 returns to the initial state of contacting the upper surface of the C-ring 71.

[0040] During operation, the valve frame 1 is installed on the ventilation duct. When a fire is required and the smoke temperature reaches the set temperature, the actuator 12 is activated, causing the blade shaft 3 to rotate and drive the blades 4 to rotate and close. When the blades 4 rotate and come into contact with each other, the pin tongue 5, pin seat 6, locking mechanism 7, and locking mechanism 8 are activated simultaneously. The pin tongue 5 and pin seat 6 on two adjacent blades 4 cooperate to make the two adjacent blades 4 fit together securely. The locking mechanism 7 locks and limits the rotated blade shaft 3, indirectly locking the blades 4 and further ensuring that each blade 4 fits firmly. The locking mechanism 8 is nested on the outside of the upper and lower ends of the blades 4, indirectly enhancing the sealing between the blades 4 and the valve frame 1, and locking and limiting the blades 4 again, preventing smoke from leaking and spreading between the blades 4 when a fire occurs.

[0041] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0042] Furthermore, the terms "first," "second," "number one," and "number two" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "number one," or "number two" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0043] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0044] The embodiments described herein are preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape, and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A fire-fighting air valve structure, comprising a valve frame, characterized in that: The valve frame has mounting boxes with opposite openings embedded and fixedly connected to both upper and lower wall plates. Several blade shafts are rotatably connected between the two mounting boxes at equal intervals. Each blade shaft has blades fixedly connected to its exterior. An actuator is provided on the upper end face of the valve frame and is drivenly connected to the blade shaft located in the middle to control the opening and closing of the blades. The lower end of the blade shaft located in the middle passes through the mounting box and is fixedly connected to a pull rod. The pull rod and the lower end face of the valve frame are fixedly connected to a tension spring. A linkage unit is provided between the blades. Each blade has a pin tongue at the front and a pin seat at the rear. The pin tongues and pin seats on two adjacent blades complement each other and engage to lock the blade in place. A limiting locking mechanism is provided between the upper mounting box and the blade shaft. The limiting locking mechanism is used to lock the blade shaft and thus indirectly lock the blade in place in a secondary manner. A sleeve locking mechanism is provided between the two mounting boxes for sliding on the upper and lower parts of the closed blade. The sleeve locking mechanism is used to enhance the sealing between the blade and the valve frame and to lock the blade in a tertiary manner. The pin tongue, pin seat, locking mechanism, and locking mechanism work together to lock the blade in multiple stages to ensure proper sealing between the blade and the valve frame.

2. The fire-fighting air valve structure according to claim 1, characterized in that: The locking mechanism includes a C-shaped ring fixedly connected to the outer wall of the blade shaft and located in the upper part of the mounting box cavity, several fixed rings fixedly connected at equal intervals between the front and rear cavity walls of the mounting box by connecting rods, and a pin slidably connected in the fixed ring for cooperating with the opening of the C-shaped ring. A compression spring is fixedly connected between the pin and the fixed ring. Two guide grooves are symmetrically opened on the outer wall of the pin, each running along its own axis. Two guide blocks are symmetrically fixedly connected to the inner wall of the fixed ring and slidably set in the guide grooves.

3. The fire-fighting air valve structure according to claim 1, characterized in that: The locking mechanism includes two rectangular plates that are slidably connected in the mounting box and movably sleeved on the outside of the blade shaft. A top spring is fixedly connected between the rectangular plates and the mounting box. An embedding groove is opened on the opposite side of the two rectangular plates, and the shape of the embedding groove matches the cross-sectional shape of the blade after rotation and closure.

4. The fire-fighting air valve structure according to claim 1, characterized in that: The pin tongue includes several pins that are equidistantly fixed to the front of the right end face of the blade, and each pin has an annular groove on its outside.

5. The fire-fighting air valve structure according to claim 4, characterized in that: The pin seat includes several pin sleeves that are equidistantly embedded and fixedly connected to the rear of the blade and correspond one-to-one with the pin post. The pin sleeves have openings facing left, and several grooves are equidistantly formed on the inner circumference of the pin sleeves. A spring is fixedly connected to the right wall of each groove. A limit spring is fixedly connected between the spring and the groove. A V-shaped locking plate for engaging with the annular groove is fixedly connected to the left side of the spring.

6. The fire-fighting air valve structure according to claim 2, characterized in that: A push pin is fixedly connected to the front part of the outer wall of the insertion post, and a slide rod is slidably connected to the front cavity wall of the upper mounting box. The left end of the slide rod passes through the left wall panel of the mounting box, and several wedge-shaped blocks for cooperating with the push pin are fixedly connected at equal intervals to the rear part of the slide rod.

7. The fire-fighting air valve structure according to claim 3, characterized in that: Both mounting boxes have a cable slidably connected to the left wall of each mounting box. The front cavity wall of each mounting box is rotatably connected to two guide wheels that are symmetrically distributed on the left and right. The cable is located at the right end of the inner cavity of the mounting box and is split in two along the left-to-right direction, passing through the outside of the guide wheels and being fixedly connected to the rectangular plate.

8. The fire-fighting air valve structure according to claim 1, characterized in that: The linkage unit includes a connecting rod fixedly connected to the left end face of the blade, and the front end of the connecting rod is hinged to a linkage rod.

9. The fire-fighting air valve structure according to claim 1, characterized in that: Both the left and right walls of the valve frame are fixedly connected to baffles. A pin tongue is also installed on the rear part of the baffle on the left, and a pin seat is also installed on the baffle on the right.

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