Roof natural ventilator

Abstract

The application discloses a roof natural ventilator, comprising at least one natural ventilator unit; the natural ventilator unit comprises a bottom beam frame, a main body frame and two arc-shaped frames; the main body frame is vertically arranged on the bottom beam frame and has two opposite first sides and two opposite second sides; the first side forms an end surface of the natural ventilator unit, and a reinforcing beam assembly is arranged in the first side; the two arc-shaped frames are connected to the two second sides respectively. The roof natural ventilator has the advantages that the reinforcing beam assembly is arranged on the end surface of the natural ventilator unit, the number of longitudinal beams on the side surface is increased, the wind resistance of the side frame and the protective plate on the end surface is improved, the ability of resisting super typhoon is improved, and the roof natural ventilator has the ability of resisting super typhoon of 16 or above.

Description

Technical Field

[0001] This invention relates to a natural ventilator, and more particularly to a roof natural ventilator. Background Technology

[0002] The ventilation system in the turbine hall of Fangchenggang Nuclear Power Plant uses a combination of mechanical air supply and natural exhaust. Five natural ventilators are installed on the roof of the turbine hall to exhaust the heat and harmful gases generated in the turbine hall, ensuring air quality.

[0003] Roof natural ventilators are widely used in large factories such as industrial plants and warehouses. They are characterized by being noiseless, highly reliable, and energy-free. They have excellent ventilation, smoke extraction, dust removal, odor elimination, cooling, and dehumidification performance, and are cost-effective, helping enterprises reduce costs and improve efficiency.

[0004] Most existing rooftop natural ventilators only have a main frame structure and can generally only be used normally under typhoon wind speeds below level 13. When level 13 or higher, or even super typhoons, occur, problems such as ventilator protective panels cracking, large-scale detachment, and steel beam deformation often occur. Safety and quality incidents such as water entering the factory and equipment damage occur frequently, seriously affecting the operation of factory equipment and posing great safety risks. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a roof natural ventilator that can withstand super typhoons.

[0006] The technical solution adopted by the present invention to solve its technical problem is: to provide a roof natural ventilator, including at least one natural ventilator unit; the natural ventilator unit includes a bottom beam frame, a main frame and two arc-shaped frames; the main frame is erected on the bottom beam frame and has two opposing first sides and two opposing second sides; the first side forms the end face of the natural ventilator unit, and a reinforcing beam assembly is provided in the first side;

[0007] The two arc-shaped frames are respectively connected to the two second sides; each arc-shaped frame includes two arc-shaped beams, at least four longitudinal beams, and a protective plate; the two arc-shaped beams are spaced apart and connected to the opposite edges of the second side, and the longitudinal beams extend along the length of the second side and are spaced apart and connected between the two arc-shaped beams; the protective plate is laid between the two arc-shaped beams and fixed on the longitudinal beams.

[0008] Preferably, the main frame includes two inverted trapezoidal side frames that are perpendicularly disposed on opposite sides of the bottom beam frame; the surface of each side frame forms the first side surface;

[0009] The side frame includes two vertical beams that are inclinedly connected to both ends of the side of the bottom beam frame, and a horizontal beam connected between the tops of the two vertical beams; the reinforcing beam assembly includes a first inclined beam, a second inclined beam, at least one third inclined beam, at least one fourth inclined beam, and several reinforcing beams.

[0010] One end of the first and second inclined beams is connected to the two vertical beams respectively, and the other ends of the first and second inclined beams face each other and meet at an angle to form a herringbone beam frame. The meeting point of the first and second inclined beams is located on the vertical centerline of the side frame.

[0011] The third inclined beam is parallel and spaced apart from the first inclined beam, and is connected between the corresponding vertical beam and horizontal beam; the fourth inclined beam is parallel and spaced apart from the second inclined beam, and is connected between the corresponding vertical beam and horizontal beam; a plurality of reinforcing beams are connected between the first inclined beam, the second inclined beam and the side of the bottom beam frame.

[0012] Preferably, the angle between the vertical beam and the horizontal beam is 75°; the angle between the upward-facing side of the first inclined beam and the vertical beam it is located in is 75°; and the angle between the upward-facing side of the second inclined beam and the vertical beam it is located in is 75°.

[0013] Preferably, the plurality of reinforcing beams include a first reinforcing beam and at least two second reinforcing beams;

[0014] The first reinforcing beam is connected between the first inclined beam and the second inclined beam; the second reinforcing beam is vertically arranged and connected between the first reinforcing beam and the side of the bottom beam frame.

[0015] Preferably, the plurality of reinforcing beams further includes a third reinforcing beam; the third reinforcing beam is connected between the two vertical beams parallel to the first reinforcing beam, and the third reinforcing beam is intersected with the second reinforcing beam.

[0016] Preferably, the arc-shaped frame includes nine longitudinal beams; two of the longitudinal beams are connected in parallel and spaced apart between the crossbeams of the two side frames; the remaining longitudinal beams are arranged at intervals along the extension direction of the arc-shaped beams and connected between the two arc-shaped beams.

[0017] Preferably, the top of each of the curved beams is aligned with the top of the vertical beam, and the bottom of the curved beams faces and is spaced from the side of the bottom beam frame.

[0018] Preferably, the arc-shaped frame further includes a bracing assembly connecting the arc-shaped beam and the corresponding crossbeam; the bracing assembly includes a first brace, a second brace, a third brace, and a reinforcing beam;

[0019] One end of the first diagonal brace is connected to the arc-shaped beam of the arc-shaped frame, and the other end is inclined downwards and connected to the corresponding vertical beam; the second diagonal brace is located below the first diagonal brace, one end of the second diagonal brace is connected to the arc-shaped beam of the arc-shaped frame, and the other end is inclined upwards and connected to the corresponding vertical beam; the third diagonal brace is located below the second diagonal brace, parallel to and spaced apart from the second diagonal brace, and connected between the arc-shaped beam of the arc-shaped frame and the corresponding vertical beam.

[0020] The reinforcing beam is vertically connected between the first and second diagonal braces.

[0021] Preferably, the main frame further includes a plurality of connecting beams located above the bottom beam frame and connecting the two side frames.

[0022] Preferably, the natural ventilator unit further includes a top plate disposed within the main frame and supported and connected to the herringbone beam.

[0023] The beneficial effects of the present invention are as follows: by setting a reinforcing beam assembly on the end face of the natural ventilator unit and increasing the number of longitudinal beams on the side, the wind resistance of the side frame and protective plate where the end face is located is improved, the ability to resist super typhoons is enhanced, and the roof natural ventilator is able to withstand super typhoons of level 16 or above. Attached Figure Description

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0025] Figure 1 This is a schematic diagram of the structure of a natural ventilator unit of a roof natural ventilator according to an embodiment of the present invention. Detailed Implementation

[0026] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0027] like Figure 1 As shown, the roof natural ventilator of the present invention includes at least one natural ventilator unit. Two or more natural ventilator units are connected in sequence to form an integral roof natural ventilator.

[0028] In practical applications, the natural ventilator unit is set to the required length according to the length of the installation location on the roof, or two or more natural ventilator units are connected to form the required roof natural ventilator for use. Two side frames 20, reinforcing beam assembly.

[0029] The natural ventilator unit may include a bottom beam 10, a main frame, and two curved frames 30.

[0030] The main frame is erected on the bottom beam 10, and the main frame has two opposing first sides and two opposing second sides. The two first sides form the end faces of the natural ventilator unit, and reinforcing beam assemblies are provided within the first sides; two arc-shaped frames 30 are respectively connected to the two second sides. In each natural ventilator unit, its two end faces are open (not closed) and connected to each other, forming a ventilation channel running through the natural ventilator unit.

[0031] Among them, the bottom beam 10 can be Figure 1 The square frame structure shown is formed by a square or rectangular frame on each side, and the frame is reinforced with vertical and / or diagonal beams inside.

[0032] The main frame further includes two inverted trapezoidal side frames 20 perpendicularly disposed on opposite sides of the bottom beam 10; the surface of each side frame 20 forms a first side of the main frame. Two opposite sides of the bottom beam 10 are designated as the first side, and the other two opposite sides as the second side. The first side faces the same direction as the first side of the main frame, and the second side faces the same direction as the second side of the main frame.

[0033] Two side frames 20 are respectively disposed on two opposite first sides of the bottom beam frame 10, and two arc-shaped frames 30 are respectively disposed on two opposite second sides of the bottom beam frame 10. The side where the side frame 20 is located is the end face of the natural ventilator unit and is open; the side where the arc-shaped frame 30 is located is the side of the natural ventilator unit and is closed. The two side frames 20 are perpendicularly disposed on opposite sides of the bottom beam frame 10, and each side frame 20 is provided with a reinforcing beam assembly. The two arc-shaped frames 30 are disposed on the other opposite sides of the bottom beam frame 10 and connected between the two side frames 20.

[0034] Specifically, each side frame 20 may include two vertical beams 21 and one horizontal beam 22. The two vertical beams 21 are respectively inclined to the two ends of the side (U-shaped frame or H-shaped frame) of the bottom beam frame 10, and are respectively inclined (not perpendicular) to the bottom beam frame 10. It can be said that the two vertical beams 21 are symmetrically distributed on both sides of the side of the bottom beam frame 10 with respect to the midline of the side of the bottom beam frame 10, and are inclined in opposite directions. The horizontal beam 22 is connected between the tops of the two vertical beams 21, and its length is greater than the length of the side of the bottom beam frame 10. The upper beam 11 of the side of the bottom beam frame 10 (i.e., the upper beam of the U-shaped frame or H-shaped frame) also forms the bottom beam of the side frame 20, which together with the vertical beams 21 and the horizontal beam 22 constitutes an inverted trapezoidal frame structure.

[0035] The bottom of the vertical beam 21 is fixed to the side of the bottom beam frame 10 by welding and / or fastening bolts. The bottom of each vertical beam 21 can also extend vertically downward, with the extended section parallel to and attached to the side beam 12 of the bottom beam frame 10 (i.e., the side beam of the U-shaped frame or the H-shaped frame), and further fastened by fastening bolts.

[0036] Each side frame 20 is equipped with a reinforcing beam assembly, which enhances the structural strength and wind resistance of the side frame 20, thereby increasing the fixing strength of the arc frame 30 and avoiding local stress concentration of the protective plate in the arc frame 30.

[0037] exist Figure 1 In the illustrated embodiment, the reinforcing beam assembly further includes a first inclined beam 41, a second inclined beam 42, at least one third inclined beam 43, at least one fourth inclined beam 44, and several reinforcing beams. One end of the first inclined beam 41 and the second inclined beam 42 are respectively connected to two vertical beams 21, and the other ends of the first inclined beam 41 and the second inclined beam 42 approach each other and meet at an angle, forming a herringbone beam frame. The meeting point of the first inclined beam 41 and the second inclined beam 42 is located on the vertical centerline of the side frame 20 (which is also the midpoint of the side of the bottom beam frame 10). The included angle between the first inclined beam 41 and the second inclined beam 42 is preferably as follows: Figure 1 The angle shown is obtuse. In addition, the connection (angle) between the first inclined beam 41 and the second inclined beam 42 also faces the crossbeam 22 near the side frame 20, and is spaced apart from the crossbeam 22 without connecting with the crossbeam 22.

[0038] The third inclined beam 43 is arranged parallel to and spaced apart from the first inclined beam 41, connecting the corresponding vertical beam 21 and horizontal beam 22. Since the third inclined beam 43 is closer to the junction of the vertical beam 21 and horizontal beam 22 than the first inclined beam 41, its length is also shorter. In a preferred embodiment, the vertical beam 21 is divided into three equal parts along its length, with the connection points of the first inclined beam 41 and the third inclined beam 43 on the vertical beam 21 located at two of these division points.

[0039] Similarly, the fourth inclined beam 44 is arranged parallel to and spaced apart from the second inclined beam 42, connecting the corresponding vertical beam 21 and horizontal beam 22. The fourth inclined beam 44 is closer to the junction of the vertical beam 21 and horizontal beam 22 than the second inclined beam 42, and its length is also shorter than that of the second inclined beam 42. In a preferred embodiment, the vertical beam 21 is divided into three equal parts along its length, with the connection points of the second inclined beam 42 and the fourth inclined beam 44 on the vertical beam 21 located at two of these division points.

[0040] Furthermore, the third inclined beam 43 and the fourth inclined beam 44 are not limited to one each, in Figure 1In the embodiment shown, there are two third inclined beams 43, which are parallel to each other; there are two fourth inclined beams 44, which are parallel to each other.

[0041] Several reinforcing beams are connected between the first inclined beam 41, the second inclined beam 42 and the side of the bottom beam frame 10, which strengthens the structure and wind resistance of the small frame formed between the first inclined beam 41, the second inclined beam 42 and the side of the bottom beam frame 10.

[0042] The included angle between the vertical beam 21 and the horizontal beam 22 is preferably 75°; the included angle between the upward side of the first inclined beam 41 and the vertical beam 21 is preferably 75°; the included angle between the upward side of the second inclined beam 12 and the vertical beam 21 is preferably 75°.

[0043] The reinforcement beams may specifically include a first reinforcement beam 45, at least two second reinforcement beams 46, and a third reinforcement beam 47. The first reinforcement beam 45 connects between a first inclined beam 41 and a second inclined beam 42. The at least two second reinforcement beams 46 are vertically arranged and spaced apart in parallel, connecting the first reinforcement beam 45 to the sides of the bottom beam frame 10. The third reinforcement beam 47 is located below the first reinforcement beam 45, parallel to the first reinforcement beam 45, and connects between two vertical beams 21. The third reinforcement beam 47 also intersects with the second reinforcement beams 46. The length of the third reinforcement beam 47 is less than the length of the first reinforcement beam 45.

[0044] As an optional configuration, a fourth reinforcing beam 48 parallel to the first reinforcing beam 45 can also be installed above it as needed.

[0045] Furthermore, the main frame also includes several connecting beams (not shown) located above the bottom beam frame 10 and connecting between the two side frames 20. The connecting beams are respectively connected between opposing first inclined beams 41, opposing second inclined beams 42, opposing third inclined beams 43, and opposing fourth inclined beams 44.

[0046] Specifically, the connecting beams may include a first connecting beam, a second connecting beam, a third connecting beam, and a fourth connecting beam. There is at least one first connecting beam, connecting between the first inclined beams 41 of the two side frames 20. There is at least one second connecting beam, connecting between the second inclined beams 42 of the two side frames 20. There is at least one third connecting beam, connecting between the third inclined beams 43 of the two side frames 20. There is at least one fourth connecting beam, connecting between the fourth inclined beams 44 of the two side frames 20.

[0047] Furthermore, each beam of the bottom beam frame 10, each beam of the side frame 20, each beam of the reinforcing beam assembly, and each diagonal brace can be formed from I-beams, with Q235B material being more preferred. As a reinforcing structure, the pipe diameter of each beam of the reinforcing beam assembly and each diagonal brace can be smaller than the pipe diameter of each beam of the bottom beam frame 10 and the side frame 20. For the connection and locking between the beams, self-tapping screws and / or rivets are preferred.

[0048] Two arc-shaped frames 30 are positioned on opposite second sides of the bottom beam frame 10, and simultaneously on the second side of the main frame. Each arc-shaped frame 30 connects between the two side frames 20 of the main frame, enclosing the second side of the main frame.

[0049] Each arc-shaped frame 30 includes two arc-shaped beams 32 ( Figure 1 The designation includes curved beams (represented by circular black dots), at least four longitudinal beams 33, and a protective plate (not shown). Two curved beams 32 are spaced apart and located outside the vertical beams 21 of the two side frames 20, respectively connecting to opposite edges of the second side. The top of each curved beam 32 aligns with the top of the vertical beam 21, and the bottom of the curved beam 32 faces and is close to the side of the bottom beam frame 10, spaced apart from the side of the bottom beam frame 10. The longitudinal beams 33 extend along the length direction of the second side, i.e., the length direction of the longitudinal beams 33 corresponds to the length direction of the second side. At least four longitudinal beams 33 are spaced apart and connected between two curved beams 32. The protective plate is laid between the two curved beams 32 and fixed to the longitudinal beams 33.

[0050] Preferably, there are nine longitudinal beams 33, arranged at intervals along the arcuate extension direction of the arcuate beam 32. Increasing the number of longitudinal beams 33 enhances the support strength of the protective plate, distributes the stress evenly on the protective plate, and avoids stress concentration after the protective plate deforms.

[0051] refer to Figure 1 In the diagram, nine circular black dots represent nine longitudinal beams 33 and their positions. Among the nine longitudinal beams 33, two longitudinal beams 33 are parallel and spaced apart between the crossbeams 22 of the two side frames 20; the remaining longitudinal beams 33 are arranged at intervals along the extension direction of the arc beams 32 and connected between the two arc beams 32.

[0052] The protective plate can be a single, integral arc-shaped plate, installed on the arc-shaped beams 32 and longitudinal beams 33 using fasteners; alternatively, the protective plate can comprise several guard strips, each guard strip spanning between two arc-shaped beams 32 and simultaneously covering and connecting to at least one longitudinal beam 33. The guard strips are arranged sequentially and connected. The protective plate is laid along the arc-shaped surface of the arc-shaped frame, enclosing the open arc-shaped surface of the arc-shaped frame.

[0053] Each longitudinal beam 33 is reinforced with a stainless steel pressure strip to ensure even stress distribution on the protective plate, prevent excessive local stress, improve the stability of the protective plate, and extend its service life.

[0054] Furthermore, the arc-shaped frame also includes a bracing assembly connecting the arc-shaped beam 32 and the corresponding crossbeam 22. The bracing assembly includes a first brace 34, a second brace 35, a third brace 36, and a reinforcing beam 37.

[0055] One end of the first diagonal brace 34 is connected to the arc-shaped beam 32 of the arc-shaped frame, and the other end is inclined downwards and connected to the corresponding vertical beam 21. The second diagonal brace 35 is located below the first diagonal brace 34, with one end connected to the arc-shaped beam 32 of the arc-shaped frame and the other end inclined upwards and connected to the corresponding vertical beam 21; the third diagonal brace 36 is located below the second diagonal brace 35, parallel to and spaced apart from the second diagonal brace 35, and connected between the arc-shaped beam 32 and the corresponding vertical beam 21 of the arc-shaped frame.

[0056] exist Figure 1 In the embodiment shown, the angle between the upward-facing side of the first diagonal brace 34 and the corresponding vertical beam 21 is 40°; the angle between the downward-facing side of the second diagonal brace 35 and the corresponding vertical beam 21 is 40°.

[0057] The reinforcing beam 37 is vertically connected between the first diagonal brace 34 and the second diagonal brace 35, further improving the structural strength of the end face where the diagonal brace is located. The included angle between the reinforcing beam 37 and the first diagonal brace 34 can be 60°.

[0058] In this invention, the bottom beam frame 10, the main frame, the reinforcing beam assembly, and the arc-shaped frame together constitute the skeleton structure (support frame) of the natural ventilator unit.

[0059] Furthermore, in the roof natural ventilator of the present invention, the natural ventilator unit also includes a top plate (not shown) disposed within the main frame and supported and connected to the A-frame beam, the top plate serving to shield against rainwater, etc. The natural ventilator unit also includes a shade net (not shown) disposed on the top of the main frame.

[0060] To analyze the stress on the roof natural ventilator of the present invention under wind speeds of 62 m / s (above level 17), vertical and parallel models of the roof natural ventilator of the present invention under wind speeds of 62 m / s (above level 17) were established, and the film + bending stress cloud diagrams of the whole, end face and top were combined.

[0061] The protective plate is made of 316L stainless steel, and the support frame is made of Q235B. The material parameters are shown in Table 1 below.

[0062] Table 1.

[0063]

[0064] Stress evaluation of protective plate:

[0065] The evaluation was conducted using the RCC-MH3325 evaluation criteria.

[0066] Table 2. Evaluation Criteria for Stress Analysis of Protective Plates

[0067]

[0068] In the table, σ m Overall primary membrane stress; σ b : Primary bending stress; S: Basic allowable stress.

[0069] The absolute values ​​of the stress values ​​of the natural ventilator under a wind speed of 62 m / s (level 17 or above) were selected for evaluation, and the results are shown in Table 3 below.

[0070] Table 3. Stress Evaluation of Protective Plates

[0071]

[0072] As shown in Table 3, the stress results of the protective plate meet the requirements of the RCC-M specification.

[0073] Evaluation of axial tensile and shear forces on the support frame:

[0074] The evaluation limits for the support frame are shown in Table 4. The shear stress was calculated by extracting the maximum axial stress, maximum bending stress, and maximum shear force of the beam and dividing by the minimum beam cross-sectional area. The maximum value was used for evaluation, and the results are shown in Table 5 below.

[0075] Table 4. Evaluation Limits for Support Frames

[0076]

[0077] In the table, F t Tensile stress, F v Shear stress, F b Bending stress, f t The calculated axial stress, f v f b The bending stresses of the two inertial planes of the cross sections were calculated.

[0078] According to RCC-MZF1370, the values ​​for r are as follows:

[0079] When S u >1.2S y r = min(1.66, 1.67 * S) u / S y Otherwise, r = 1.4. From Table 1, we know that r = 1.66.

[0080] Table 5. Evaluation Results of Support Frame

[0081]

[0082] Stability evaluation of the support frame structure:

[0083] (1) Limit of compressive stress

[0084] According to RCC-MZVI2214 requirements, the compressive stress u of the beam section of the support frame is related to the slenderness ratio kl / r of the beam. When the slenderness ratio kl / r is less than the limiting slenderness ratio C... c At that time, the compressive stress limit is:

[0085]

[0086] Among them, the limiting slenderness ratio K is the length factor; r is the minimum radius of inertia of the beam cross section.

[0087] When the slenderness ratio is greater than C c At that time, the compressive stress limit is:

[0088]

[0089] (2) Evaluation results

[0090] The maximum axial stress value of the beam in the support frame was extracted and evaluated. The results are shown in Table 6 below.

[0091] Table 6

[0092]

[0093] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A roof natural ventilator, characterized in that, It includes at least one natural ventilator unit; the natural ventilator unit includes a bottom beam frame, a main frame and two arc-shaped frames; the main frame is erected on the bottom beam frame and has two opposing first sides and two opposing second sides; the first side forms the end face of the natural ventilator unit, and a reinforcing beam assembly is provided in the first side; The two arc-shaped frames are respectively connected to the two second side surfaces; each arc-shaped frame includes two arc-shaped beams, at least four longitudinal beams, and a protective plate; the two arc-shaped beams are spaced apart and connected to opposite edges of the second side surface, and the longitudinal beams extend along the length of the second side surface and are spaced apart and connected between the two arc-shaped beams; the protective plate is laid between the two arc-shaped beams and fixed to the longitudinal beams; the longitudinal beams are provided with stainless steel pressure strips for fixing the protective plate; The main frame includes two inverted trapezoidal side frames that are perpendicular to the bottom beam and arranged on opposite sides of the bottom beam; the surface of each side frame forms the first side surface; The side frame includes two vertical beams that are inclinedly connected to both ends of the side of the bottom beam frame, and a horizontal beam connected between the tops of the two vertical beams; the reinforcing beam assembly includes a first inclined beam, a second inclined beam, at least one third inclined beam, at least one fourth inclined beam, and several reinforcing beams. One end of the first and second inclined beams is connected to the two vertical beams respectively, and the other ends of the first and second inclined beams face each other and meet at an angle to form a herringbone beam frame. The meeting point of the first and second inclined beams is located on the vertical centerline of the side frame. The third inclined beam is parallel and spaced apart from the first inclined beam, and is connected between the corresponding vertical beam and horizontal beam; the fourth inclined beam is parallel and spaced apart from the second inclined beam, and is connected between the corresponding vertical beam and horizontal beam; a plurality of the reinforcing beams are connected between the first inclined beam, the second inclined beam and the side of the bottom beam frame; The plurality of reinforcing beams include a first reinforcing beam, at least two second reinforcing beams, and a third reinforcing beam; the first reinforcing beam is connected between the first inclined beam and the second inclined beam; the second reinforcing beam is vertically arranged and connected between the first reinforcing beam and the side of the bottom beam frame; the third reinforcing beam is parallel to the first reinforcing beam and connected between the two vertical beams, and the third reinforcing beam intersects with the second reinforcing beam. The arc-shaped frame also includes a bracing assembly connecting the arc-shaped beam and the corresponding crossbeam, the bracing assembly including a first brace, a second brace, a third brace and a reinforcing beam; One end of the first diagonal brace is connected to the arc beam of the arc frame, and the other end is inclined downwards and connected to the corresponding vertical beam; The second diagonal brace is located below the first diagonal brace. One end of the second diagonal brace is connected to the arc beam of the arc frame, and the other end is inclined upward and connected to the corresponding vertical beam. The third diagonal brace is located below the second diagonal brace, parallel to and spaced apart from the second diagonal brace, and connected between the arc-shaped beam and the corresponding vertical beam of the arc-shaped frame; The reinforcing beam is vertically connected between the first and second diagonal braces.

2. The roof natural ventilator according to claim 1, characterized in that, The included angle between the vertical beam and the horizontal beam is 75°; the included angle between the upward side of the first inclined beam and the vertical beam it is located on is 75°; the included angle between the upward side of the second inclined beam and the vertical beam it is located on is 75°.

3. The roof natural ventilator according to claim 1, characterized in that, The arc-shaped frame includes nine longitudinal beams; two of the longitudinal beams are parallel and spaced apart between the crossbeams of the two side frames; the remaining longitudinal beams are spaced apart along the extension direction of the arc-shaped beams and connected between the two arc-shaped beams.

4. The roof natural ventilator according to claim 1, characterized in that, The top of each of the curved beams abuts against the top of the vertical beam, and the bottom of the curved beams faces and is spaced from the side of the bottom beam frame.

5. The roof natural ventilator according to claim 1, characterized in that, The main frame also includes several connecting beams located above the bottom beam frame and connecting the two side frames.

6. The roof natural ventilator according to claim 5, characterized in that, The natural ventilation unit also includes a top plate disposed within the main frame and supported on the herringbone beam.

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