High-air-tightness air valve

Abstract

The invention belongs to the technical field of air duct valves, and discloses a high-air-tightness air valve which comprises a valve frame and a plurality of rotating shafts and valve blades with the same number, the valve blades are divided into middle blades and side blades according to mounting positions, and the number of the rotating shafts is even; different from the mode that multiple blades synchronously rotate in the same direction and then are in lap joint to achieve sealing, sealing is conducted by innovatively utilizing inserting connection between the blades, the valve blades of the even number are arranged, rotating shafts of the valve blades are equally divided into two sets at the odd number position and the even number position, and the two sets of rotating shafts are connected through two sets of connecting rod mechanisms; synchronous and same-direction rotation of each group of rotating shafts is realized; the sealing structure is arranged between the two blades, so that the sealing performance between the two blades is effectively improved, complete sealing of the air valve is achieved, air circulation is effectively blocked, the resistance of the blades to air pressure is enhanced, and the sealing structure is internally coated with a fireproof material, so that the air valve has efficient fireproof capacity.

Description

Technical Field

[0001] The invention belongs to the technical field of air duct valves, and in particular relates to a high-air-tightness air valve. Background Art

[0002] The traditional air valve closes and opens the air duct by means of a structure in which the blades overlap each other. This structure has low strength, poor sealing performance, and is very complicated to maintain, or even impossible to maintain. Therefore, it is necessary to redesign the driving structure and sealing mechanism of the air valve blades to solve the many technical problems existing in the above-mentioned prior art. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a high airtightness air valve to solve the above-mentioned problem.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions: A high airtight air valve comprises a valve frame and a plurality of rotating shafts and valve blades of the same number, wherein the valve blades are divided into middle blades and side blades according to the installation positions, the number of the plurality of rotating shafts is an even number, and the plurality of rotating shafts are evenly connected to the inside of the valve frame along the horizontal direction with bearings, the two rotating shafts located in the center of the valve frame are both set as drive shafts, a synchronous driving mechanism is set between the tops of the two driving shafts, the two driving main shafts are driven by the synchronous driving mechanism to rotate synchronously in opposite directions, the rotating shafts at odd-numbered positions and the rotating shafts at even-numbered positions are respectively connected to two groups of connecting rod mechanisms to realize synchronous rotation, the rotating shaft closest to one side of the valve frame is vertically fixedly installed with the side blades, and the remaining rotating shafts are fixedly installed with the middle blades, the vertical side of one side of the middle blade is provided with a sealing structure, and the sealing structure of two adjacent middle blades The sealing structures are not on the same side, one of the two side blades is fixedly installed with the sealing structure, the sealing structure of the side blade and the sealing structure of the adjacent middle blade are not on the same side, the sealing structure of the middle blade is plugged and sealed with the adjacent side blade or the non-installed vertical edge of the adjacent middle blade, the sealing structure of the side blade is plugged and sealed with the non-installed vertical edge of the adjacent middle blade, the side blade is rotated close to the side of the inner wall of the valve frame and is bent to form a sealing fold, the sealing fold is plugged into the sealing groove, and the sealing groove is fixedly installed vertically at the middle part of the inner wall of the valve frame, each of the middle blades and each of the side blades are driven by the synchronous drive mechanism to be connected end to end or arranged parallel to each other, and any one of the drive shafts is fixedly installed with the rotating end of the rotating motor or the manual crank.

[0005] Further, the synchronous drive structure includes an A synchronization mechanism 4 and a B synchronization mechanism; The A synchronization mechanism 4 includes two wheels and a steel wire rope. The two wheels are fixedly installed on the two driving shafts near the top respectively. The steel wire rope is wound between the two wheels in an "8" shape. The steel wire rope is fixed to the two wheels at one point through two sets of fixing bolts.

[0006] Furthermore, the B synchronization mechanism includes two gears and a chain. The two gears are fixedly installed on the two driving shafts near the top, and the chain is connected between the two gears in an "8" shape.

[0007] Furthermore, the connecting rod mechanism includes a pulling rod and multiple rotating rods, one end of the multiple rotating rods are evenly arranged along the length direction of the pulling rod and hinged to it, and the other ends of the multiple rotating rods are respectively fixedly connected to each of the rotating shafts at odd positions or even positions.

[0008] Furthermore, the sealing structure includes a steel plate and two elastic steel sheets, the steel plate is bent into an H-shaped structure, one side of the H-shaped structure is turned outward to form a trumpet-shaped structure, both ends of the trumpet-shaped structure are bent inward to respectively press and fix one end of the two elastic steel sheets, the other end of the H-shaped structure is plugged into the vertical edge of one side of the valve blade, and the spacing between the two elastic steel sheets is less than the thickness of the valve blade.

[0009] Furthermore, the sealing structure includes a steel plate and two elastic steel sheets, the steel plate is bent into an H-shaped structure, both ends of one side of the H-shaped structure are turned outward to form a trumpet-shaped structure, and the other end of the H-shaped structure is bent inward to form a U-shaped groove, one end of the elastic steel sheet is inserted into the bending gap of the U-shaped groove and fixed, the spacing between the two elastic steel sheets is smaller than the thickness of the valve blade, and the U-shaped groove is plugged into the vertical edge of one side of the valve blade.

[0010] Furthermore, the sealing structure includes a steel plate, which is bent into an H-shaped structure. Both ends of one side of the H-shaped structure are turned outward to form a trumpet-shaped structure. A fire-retardant coating that expands when exposed to high temperatures is arranged in the trumpet-shaped structure. The other end of the H-shaped structure is bent inward to form a U-shaped groove, and the U-shaped groove is plugged into the vertical edge of one side of the valve blade.

[0011] Furthermore, the sealing structure includes two elastic steel sheets and two pressure plates, the two pressure plates are fixedly installed on the front and back sides of one side of the valve blade by rivets respectively, the elastic steel sheet is clamped between the pressure plate and the valve blade and fixed by the rivets, the front ends of the two pressure plates are folded outward to form a trumpet-shaped structure, and the spacing between the two elastic steel sheets is smaller than the thickness of the valve blade.

[0012] Furthermore, the sealing structure includes two elastic steel sheets and a pressure plate, the vertical edge of one side of the valve blade is pressed out with a step portion, the two elastic steel sheets are clamped between the step portion and the pressure plate and fixed by rivets, the front ends of the step portion and the pressure plate are turned outward to form a trumpet-shaped structure, and the spacing between the two elastic steel sheets is smaller than the thickness of the valve blade.

[0013] Furthermore, the sealing structure includes two elastic steel sheets, a vertical edge on one side of the valve blade is pressed out with a step portion, the two valve blades are attached and fixed by rivets, the two step portions form a trumpet-shaped structure, the two elastic steel sheets are inside the trumpet-shaped structure, and the spacing between the two elastic steel sheets is smaller than the thickness of the valve blade.

[0014] Compared with the prior art, the present invention has the following beneficial effects: The present invention is different from the method of sealing by overlapping each other after synchronously rotating multiple blades in the same direction. It innovatively uses the plug-in connection between blades to achieve sealing. An even number of valve blades are set, and the rotating shafts of the valve blades are equally divided into two groups of odd and even positions, and the two groups of rotating shafts are connected by two groups of connecting rod mechanisms, so as to achieve synchronous and same-direction rotation of each group of rotating shafts; thereby, the rotation directions of two adjacent valve blades are opposite, and the head and tail are actually engaged with each other to form a straight-line sealing state, thereby effectively improving the sealing performance between the two blades, thereby achieving complete sealing of the air valve, thereby effectively blocking air circulation, and enhancing the resistance of the blades to wind pressure. Moreover, by coating fire-proof material in the sealing structure, the air valve has high efficient fire-proof capability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall planar structure of the present invention; Figure 2 It is a schematic diagram of the planar structure of the A synchronization mechanism; Figure 3 It is a schematic diagram of the planar structure of the B synchronization mechanism; Figure 4 It is a schematic diagram of the planar structure of the connecting rod mechanism; Figure 5 are planar structural diagrams of six embodiments of the sealing structure; Figure 6 It is a flow chart of the present invention from closed state to open state.

[0016] In the figure: 1. valve frame; 11. sealing groove; 2. middle blade; 3. connecting rod mechanism; 31. pull rod; 32. rotary rod; 4. A synchronization mechanism; 41. rotating wheel; 42. wire rope; 43. fixing bolt; 5. sealing structure; 51. elastic steel sheet; 52. steel plate; 53. rivet; 54. pressure plate; 55. step difference; 56. fire retardant coating; 6. B synchronization mechanism; 61. gear; 62. chain; 7. side blade; 71. sealing folding edge; 8. driving shaft. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0018] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0019] Please refer to Figure 1-6 As shown, an embodiment of the present application provides a high airtightness air valve, comprising a valve frame 1 and a plurality of rotating shafts and valve blades of the same number, the valve blades being divided into a middle blade 2 and a side blade 7 according to the installation position, the number of the plurality of rotating shafts being an even number, and being evenly bearing-connected to the inside of the valve frame 1 along the transverse direction, the two rotating shafts located in the center of the valve frame 1 are both set as drive shafts 8, a synchronous driving mechanism is arranged between the tops of the two drive shafts 8, the two driving main shafts are driven to rotate synchronously in opposite directions by the synchronous driving mechanism, the rotating shafts at odd-numbered positions and the rotating shafts at even-numbered positions are respectively connected to two groups of connecting rod mechanisms 3 to realize synchronous rotation, the rotating shaft closest to one side of the valve frame 1 is vertically fixedly installed with a side blade 7, the remaining rotating shafts are all fixedly installed with a middle blade 2, a sealing structure 5 is arranged on the vertical side of one side of the middle blade 2, and two adjacent middle blades are sealed with each other. 2, the sealing structure 5 is not on the same side, one of the two side blades 7 is fixedly installed with the sealing structure 5, the sealing structure 5 of the side blade 7 is not on the same side as the sealing structure 5 of the adjacent middle blade 2, the sealing structure 5 of the middle blade 2 is plugged and sealed with the adjacent side blade 7 or the non-installed vertical edge of the adjacent middle blade 2, the sealing structure 5 of the side blade 7 is plugged and sealed with the non-installed vertical edge of the adjacent middle blade 2, the side blade 7 is rotated to form a sealing fold 71 by bending on one side close to the inner wall of the valve frame, the sealing fold 71 is plugged into the sealing groove 11, and the sealing groove 11 is fixedly installed vertically at the middle part of the inner wall of the valve frame, each middle blade 2 and each side blade 7 are driven by a synchronous drive mechanism to be connected end to end or arranged parallel to each other, and any drive shaft 8 is fixedly installed with the rotating end of the rotating motor or the manual crank.

[0020] Specifically, Figure 1 , 6 As shown, the air valve is different from the conventional sealing method, i.e., the shutter-type structure, and is different from the sealing achieved by overlapping each other after synchronous and unidirectional rotation of multiple blades. It innovatively uses the plug-in connection between blades for sealing, and sets an even number of valve blades, and divides the rotating shaft of the valve blade into two groups of odd and even positions, and connects the two groups of rotating shafts through two groups of connecting rod mechanisms 3, so as to achieve synchronous and unidirectional rotation of each group of rotating shafts; At the same time, by setting the two rotating shafts located in the center of the valve frame as the driving shafts 8, the two driving shafts 8 are synchronously driven to rotate in opposite directions at the same time through the synchronous driving structure, so that the two sets of rotating shafts are respectively driven to rotate in different directions through the two sets of connecting rod mechanisms 3, so that the rotation directions of the two adjacent valve leaves are opposite, and the head and tail are actually engaged with each other in a straight-line sealing state. In addition, in order to increase the sealing performance of the leaf engagement gap, the valve leaves are provided with a plurality of middle leaves 2 and two side leaves 7. Since the two adjacent middle leaves 2 rotate in opposite directions, the vertical leaves on different sides of the two adjacent middle leaves 2 are A sealing structure 5 is arranged on the side, so that after rotation, the sealing structure 5 can be plugged into the vertical side of the adjacent middle blade 2 where the sealing structure 5 is not installed, thereby improving the sealing performance between the two blades. According to this logic, it is only necessary to install the sealing structure 5 on the vertical side corresponding to one side blade 7, and the other side blade 7 does not need to be equipped with a sealing structure 5. Finally, by bending the end of the side blade 7 that contacts the valve frame to form a sealing fold 71 and inserting it into the sealing groove 11 provided on the inner wall of the valve frame, the air valve can be completely sealed, thereby effectively blocking the air circulation and enhancing the blade's resistance to wind pressure.

[0021] Further, the synchronous drive structure includes an A synchronous mechanism 4 and a B synchronous mechanism 6; A synchronization mechanism 4 includes two wheels 41 and a wire rope 42. The two wheels 41 are fixedly installed on the two drive shafts 8 near the top respectively. The wire rope 42 is wound between the two wheels 41 in an "8" shape. The wire rope 42 is fixed to the two wheels 41 at one point through two sets of fixing bolts 43.

[0022] Specifically, Figure 2As shown, in order to realize synchronous and reverse rotation of the two driving shafts 8, a steel wire rope 42 in the shape of "8" is wound between two rotating wheels 41 respectively fixedly installed at the ends of the driving shafts 8, and two points on the steel wire rope 42 are respectively fixed to the two rotating wheels 41 by fixing bolts 43, and then one of the driving shafts 8 can be rotated by a rotating motor or a manual crank to drive one of the rotating wheels 41 to rotate, so that the other driving shaft 8 and the rotating wheel 41 are synchronously rotated in opposite directions under the transmission connection of the steel wire rope 42. Since the two driving shafts 8 belong to two groups of rotating shafts, the two groups of rotating shafts at odd and even positions can be driven by the transmission of the two groups of connecting rod mechanisms 3, so as to finally realize the synchronous rotation of the directions of the two groups of rotating shafts at odd and even positions, thereby realizing the opening and closing of each valve blade.

[0023] The synchronous mechanism 6 includes two gears 61 and a chain 62. The two gears 61 are fixedly mounted on the two driving shafts 8 near the top, respectively. The chain 62 is connected between the two gears 61 in an "8" shape.

[0024] Specifically, Figure 3 As shown, in order to further stabilize and improve the transmission force, it is achieved through the practical use of gears 61 and chains 62. This structure is another implementation form of the air valve, which is beneficial to further improve the overall performance of the air valve, and also further enhances the strength of the structure and can withstand stronger wind pressure.

[0025] The connecting rod mechanism 3 includes a pull rod 31 and a plurality of rotating rods 32. One ends of the plurality of rotating rods 32 are evenly arranged along the length direction of the pull rod 31 and are hinged thereto. The other ends of the plurality of rotating rods 32 are respectively fixedly connected to the rotating shafts at odd positions or even positions.

[0026] Specifically, Figure 4 As shown, the connecting rod mechanism 3 is a parallel connecting rod mechanism 3, and the rule that the pull rod 31 can only move forward and backward is used to realize the synchronous and same-direction rotation of the rotating shafts connected thereto.

[0027] The air valve is designed with the following five sealing structures 5 according to different practical environments, cost control and production processes: The sealing structure 5a includes a steel plate 52 and two elastic steel sheets 51. The steel plate 52 is bent into an H-shaped structure. One side of the H-shaped structure is turned outward to form a trumpet-shaped structure. The two ends of the trumpet-shaped structure are bent inward to press and fix one end of the two elastic steel sheets 51 respectively. The other end of the H-shaped structure is plugged into the vertical edge of one side of the valve blade. The distance between the two elastic steel sheets 51 is less than the thickness of the valve blade.

[0028] The sealing structure 5b includes a steel plate 52 and two elastic steel sheets 51. The steel plate 52 is bent into an H-shaped structure. The two ends of one side of the H-shaped structure are turned outward to form a trumpet-shaped structure. The other end of the H-shaped structure is bent inward to form a U-shaped groove. One end of the elastic steel sheet 51 is inserted into the bending gap of the U-shaped groove and fixed. The distance between the two elastic steel sheets 51 is smaller than the thickness of the valve blade. The U-shaped groove is plugged into the vertical edge of one side of the valve blade.

[0029] The sealing structure 5c includes a steel plate 52, which is bent into an H-shaped structure. The two ends of one side of the H-shaped structure are turned outward to form a trumpet-shaped structure. A fire-retardant coating 56 that expands when exposed to high temperatures is arranged in the trumpet-shaped structure. The other end of the H-shaped structure is bent inward to form a U-shaped groove, which is plugged into the vertical edge of one side of the valve blade.

[0030] The sealing structure 5d includes two elastic steel sheets 51 and two pressure plates 54. The two pressure plates 54 are fixedly installed on the front and back sides of one side of the valve blade by rivets 53 respectively. The elastic steel sheet 51 is clamped between the pressure plate 54 and the valve blade and fixed by rivets 53. The front ends of the two pressure plates 54 are folded outward to form a trumpet-shaped structure. The distance between the two elastic steel sheets 51 is smaller than the thickness of the valve blade.

[0031] The sealing structure 5e includes two elastic steel sheets 51 and a pressure plate 54. A step portion 55 is pressed out from the vertical edge of one side of the valve blade. The two elastic steel sheets 51 are clamped between the step portion 55 and the pressure plate 54 and fixed by rivets 53. The front ends of the step portion 55 and the pressure plate 54 are turned outward to form a trumpet-shaped structure. The distance between the two elastic steel sheets 51 is smaller than the thickness of the valve blade.

[0032] The sealing structure 5f includes two elastic steel sheets 51, and a step portion 55 is pressed out of the vertical edge on one side of the valve blade. The two valve blades are attached and fixed by rivets 53. The two step portions 55 form a trumpet-shaped structure. The two elastic steel sheets 51 are located inside the trumpet-shaped structure, and the distance between the two elastic steel sheets 51 is less than the thickness of the valve blade.

[0033] Specifically, Figure 5 As shown, the sealing structure 5 is divided into detachable type (a, b, c) and integrated type (d, e, f) according to the installation form with the valve blade; In the disassembly and assembly types (a, b, c), the steel plate 52 is bent into an H-shaped structure, and the two ends of one side of the H-shaped structure are turned outward to form a trumpet shape to facilitate plugging with the adjacent vertical edges of the valve blades. At the same time, two elastic steel sheets 51 are fixedly installed in the trumpet-shaped structure by turning the edges inward or clamping them in the bending gap of the U-shaped groove to clamp and stabilize the valve blades. The U-shaped groove is plugged and installed with the vertical edges of the valve blades. The advantage of this structure is that it can be produced separately in modular form, which is convenient for installation and disassembly, thereby facilitating the maintenance of the air valve. In addition, in order to make the air valve have efficient fireproof performance, the elastic steel sheet 51 is removed and the fireproof coating 56 is applied inside the trumpet-shaped structure. In a sealed state, if a fire occurs, the fireproof coating 56 expands after encountering a high-temperature open flame, thereby completely blocking the connecting gaps between the valve blades, thereby completely preventing the diffusion of high-temperature air.

[0034] In the integrated type (d, e, f), a pressure plate 54 is added to the vertical side of the valve blade, and the two added pressure plates 54 form a trumpet-shaped structure, and then the pressure plate 54 and the internal elastic steel sheet 51 are assembled by rivets 53 to form a sealing structure 5, thereby simplifying the production process and production cost, and also increasing the overall rigidity of the blade, making the blade more durable; In addition, in order to further simplify the production process and reduce costs, a step portion 55 is formed by pressing and bending one side of the vertical side of the valve blade, and the step portion 55 is formed into a trumpet-shaped structure with the pressure plate 54, thereby further saving materials. In addition, in order to further improve the strength of the blades, the step portions 55 of the two valves are aligned to form a trumpet-shaped structure, and then the two are fixed by rivets 53. This method can further simplify the production process.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A high airtightness air valve, comprising a valve frame (1) and a plurality of rotating shafts and valve blades of the same number, characterized in that: The valve blades are divided into a middle blade (2) and a side blade (7) according to the installation position. The number of the plurality of rotating shafts is an even number and they are evenly connected to the inside of the valve frame (1) along the horizontal direction. The two rotating shafts located in the center of the valve frame (1) are both set as drive shafts (8). A synchronous drive mechanism is provided between the tops of the two drive shafts (8). The two drive main shafts are driven by the synchronous drive mechanism to rotate synchronously in opposite directions. The rotating shafts at odd positions and the rotating shafts at even positions are respectively connected to two groups of connecting rod mechanisms (3) to achieve synchronous rotation. The rotating shaft closest to the valve frame (1) is fixedly installed with the side blade (7) in the vertical direction, and the remaining rotating shafts are fixedly installed with the middle blade (2). A sealing structure (5) is provided on the vertical side of one side of the middle blade (2). The sealing structures (5) of two adjacent middle blades (2) are not on the same side. One of the two side blades (7) is fixedly installed. The sealing structure (5) is provided, wherein the sealing structure (5) of the side blade (7) and the sealing structure (5) of the adjacent middle blade (2) are not on the same side, the sealing structure (5) of the middle blade (2) is plugged and sealed with the adjacent side blade (7) or the non-installed vertical edge of the adjacent middle blade (2), the sealing structure (5) of the side blade (7) is plugged and sealed with the non-installed vertical edge of the adjacent middle blade (2), the side blade (7) is rotated to be close to the inner wall of the valve frame and then bent to form a sealing fold (71), the sealing fold (71) is plugged into a sealing groove (11), and the sealing groove (11) is fixedly installed in the middle of the inner wall of the valve frame in the vertical direction, each of the middle blades (2) and each of the side blades (7) are driven by the synchronous drive mechanism to be connected end to end or arranged in parallel with each other, and any one of the drive shafts (8) is fixedly installed with the rotating end of the rotating motor or the manual crank.

2. A high airtightness air valve according to claim 1, characterized in that: The synchronous drive structure comprises an A synchronous mechanism 4 (4) and a B synchronous mechanism (6); The A synchronization mechanism 4 (4) comprises two rotating wheels (41) and a steel wire rope (42). The two rotating wheels (41) are respectively fixedly mounted near the top of the two driving shafts (8). The steel wire rope (42) is wound between the two rotating wheels (41) in an "8" shape. The steel wire rope (42) is respectively connected to the two rotating wheels (41) at one point through two sets of fixing bolts (43).

3. A high airtightness air valve according to claim 2, characterized in that: The synchronous mechanism (6) with B comprises two gears (61) and a chain (62), wherein the two gears (61) are respectively fixedly mounted near the top of the two drive shafts (8), and the chain (62) is connected between the two gears (61) in an "8" shape.

4. A high airtightness air valve according to claim 1, characterized in that: The connecting rod mechanism (3) comprises a pulling rod (31) and a plurality of rotating rods (32), one end of the plurality of rotating rods (32) being evenly arranged along the length direction of the pulling rod (31) and hinged thereto, and the other ends of the plurality of rotating rods (32) being fixedly connected to the rotating shafts at odd-numbered positions or even-numbered positions, respectively.

5. The high airtightness air valve according to claim 1, characterized in that: The sealing structure (5) comprises a steel plate (52) and two elastic steel plates (51); the steel plate (52) is bent into an H-shaped structure; one side of the H-shaped structure is turned outward to form a trumpet-shaped structure; two ends of the trumpet-shaped structure are bent inward to respectively press and fix one end of the two elastic steel plates (51); the other end of the H-shaped structure is plugged into a vertical edge of one side of the valve blade; and the distance between the two elastic steel plates (51) is less than the thickness of the valve blade.

6. A high airtightness air valve according to claim 1, characterized in that: The sealing structure (5) comprises a steel plate (52) and two elastic steel plates (51); the steel plate (52) is bent into an H-shaped structure; both ends of one side of the H-shaped structure are turned outward to form a trumpet-shaped structure; the other end of the H-shaped structure is bent inward to form a U-shaped groove; one end of the elastic steel plate (51) is inserted into the bending gap of the U-shaped groove for fixation; the distance between the two elastic steel plates (51) is less than the thickness of the valve blade; the U-shaped groove is plugged into the vertical edge of one side of the valve blade.

7. The high airtightness air valve according to claim 1, characterized in that: The sealing structure (5) comprises a steel plate (52), wherein the steel plate (52) is bent into an H-shaped structure, wherein both ends of one side of the H-shaped structure are turned outward to form a trumpet-shaped structure, wherein a fire-retardant coating (56) that expands when exposed to high temperatures is arranged in the trumpet-shaped structure, and the other end of the H-shaped structure is bent inward to form a U-shaped groove, wherein the U-shaped groove is plugged into the vertical edge of one side of the valve blade.

8. The high airtightness air valve according to claim 1, characterized in that: The sealing structure (5) comprises two elastic steel sheets (51) and two pressure plates (54), the two pressure plates (54) being fixedly mounted on the front and back sides of one side of the valve blade respectively by means of rivets (53), the elastic steel sheet (51) being clamped between the pressure plates (54) and the valve blade and being fixed by means of the rivets (53), the front ends of the two pressure plates (54) being folded outwards to form a trumpet-shaped structure, and the distance between the two elastic steel sheets (51) being smaller than the thickness of the valve blade.

9. The high airtightness air valve according to claim 1, characterized in that: The sealing structure (5) comprises two elastic steel sheets (51) and a pressure plate (54); a step portion (55) is pressed out from a vertical edge of one side of the valve blade; the two elastic steel sheets (51) are clamped between the step portion (55) and the pressure plate (54) and fixed by rivets (53); the front ends of the step portion (55) and the pressure plate (54) are turned outward to form a trumpet-shaped structure; and the distance between the two elastic steel sheets (51) is smaller than the thickness of the valve blade.

10. The high airtightness air valve according to claim 1, characterized in that: The sealing structure (5) comprises two elastic steel sheets (51), a step portion (55) is pressed out of a vertical edge on one side of the valve blade, the two valve blades are attached and fixed by rivets (53), the two step portions (55) form a trumpet-shaped structure, the two elastic steel sheets (51) are located inside the trumpet-shaped structure, and the distance between the two elastic steel sheets (51) is less than the thickness of the valve blade.

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