A jet flow air extraction hood for building construction and a method of using the same

Abstract

The present invention relates to an induced flow air extraction hood for building construction and a method for using the hood, and belongs to the technical field of the construction industry. The technical solution is: at least one side of the smoke exhaust port (13) of the flue in the hood is provided with an insertion pipe (14) extending upward and parallel thereto, and the outlet of the smoke exhaust port (13) of the flue in the hood merges with the air outlet (4) of the insertion pipe in the middle of the hood; the insertion pipe (14) is a variable diameter air duct, and the inner diameter at the air inlet (3) of the insertion pipe is the largest, and the inner diameter gradually decreases, and the inner diameter at the air outlet (4) of the insertion pipe is the smallest. The positive effects of the present invention: the structure of the hood is improved, and an insertion pipe is provided on at least one side of the hood to form a drainage, jet, and air extraction effect with the smoke exhaust duct, and the exhaust effect is improved by the induced flow.

Description

Technical Field

[0001] The invention relates to an ejection flow air extraction hood for house construction and a use method thereof, belonging to the technical field of the construction industry. Background Art

[0002] The hood is one of the ventilation equipment for building construction, installed on the vents or exhaust pipes on the roof, the top of the factory building, etc. The unpowered hood uses the principle of natural wind speed to promote indoor and outdoor air convection, accelerates the flowing air and converts it into vertical air flow from bottom to top to improve the indoor ventilation effect. It does not require electricity and can operate for a long time to remove indoor heat, moisture and foul air and improve the indoor environment. At present, the roofs of high-rise buildings are all equipped with hoods, which are located at the top of the smoke exhaust duct. The hoods in the existing technology have the following problems: they rely entirely on the natural exhaust of the smoke exhaust duct, have no drainage, jet and air extraction effects, and have low exhaust efficiency. In addition, the hood structure is unreasonable, which affects the exhaust efficiency. Summary of the invention

[0003] The object of the present invention is to provide a hood with an induced jet flow and an air extraction method for building construction, wherein an insertion pipe is arranged on at least one side of the hood to form a drainage, jet and air extraction effect with the smoke exhaust duct, the exhaust effect is improved by the induced jet flow, the hood structure is improved, the exhaust volume is increased, and the above-mentioned problems existing in the background technology are solved.

[0004] The technical solution of the present invention is:

[0005] The utility model discloses an induced flow air extraction hood for building construction, which is arranged at the top of a smoke exhaust duct and comprises an inner smoke duct of the hood, an air inlet of an inserted pipe, an air outlet of the inserted pipe, a smoke exhaust port of the inner smoke duct of the hood and an inserted pipe; the inner smoke duct of the hood is connected with the smoke exhaust duct at the bottom, the inner smoke duct of the hood extends upward to the middle of the hood, the inserted pipe is inserted upward into the inner smoke duct of the hood from the outer side of the inner smoke duct of the hood, the number of inserted pipes is more than one, the air inlet of the inserted pipe is located outside the lower part of the hood, the air outlet of the inserted pipe is located in the middle of the hood, the inner smoke duct exhaust port of the inner smoke duct of the hood and the air outlet of the inserted pipe are merged in the middle of the hood, and the air outlet of the inserted pipe is inserted into the smoke exhaust port of the inner smoke duct of the hood.

[0006] The inserted pipe is a variable diameter air duct, the inner diameter of the inserted pipe air inlet is the largest, the inner diameter gradually decreases, and the inner diameter of the inserted pipe air outlet is the smallest. That is, the inserted pipe is a variable diameter air duct, and the cross-sectional area of ​​the inserted pipe air inlet is larger than the cross-sectional area of ​​the inserted pipe air outlet.

[0007] The middle part of the hood is provided with an inner hood tube, the outlet of the smoke exhaust port of the hood and the outlet of the inserted pipe are located in the inner hood tube, and the height of the inner hood tube is greater than the outlet of the smoke exhaust port of the hood and the outlet of the inserted pipe. The greater the height difference, the better the drainage jet and air extraction effect.

[0008] The top of the inner tube of the hood is an inwardly converging structure, so that the inner diameter of the top opening of the inner tube of the hood is smaller than the inner diameter of the bottom of the inner tube of the hood, which is convenient for the guide flow plate on the outer periphery of the inner tube of the hood to produce upward jet, drainage and air extraction effects. The outer edges of the upper cover of the hood are downwardly bent outer edges, which match the inwardly converging structure of the inner tube of the hood below to prevent rainwater from entering.

[0009] An air outlet cover is provided on the inserted pipe air outlet through a hinge shaft, and the air outlet cover does not completely cover the inserted pipe air outlet; an air outlet cover limiting mechanism is also provided on the inserted pipe air outlet, and the air outlet cover limiting mechanism is composed of a vertical rod and a limiting bolt, the vertical rod is vertically arranged on the inserted pipe air outlet, and is located behind the air outlet cover, and a limiting bolt is provided on the vertical rod, and the limiting bolt matches the air outlet cover to limit the flipping angle of the air outlet cover, and the flipping angle is less than 90 degrees.

[0010] The overall shape of the insertion conduit is arbitrary, for example: an L-shaped insertion conduit, a straight insertion conduit, and the like.

[0011] The "insertion" mentioned in the present invention includes different wording expressions such as embedding, inlaying, merging, sticking close, and so on.

[0012] The inserted pipe air inlet is in a trumpet shape, which is larger on the outside and smaller on the inside. The outside is a rectangular inlet, and the inside is connected to the inserted pipe air outlet. The cross-sectional area of ​​the inserted pipe air outlet is 1 / 4 of the cross-sectional area of ​​the inserted pipe air inlet.

[0013] A deflector plate and a steel plate frame are provided in the middle of the hood, a plurality of deflector plates are fixed on the steel plate frame, the steel plate frame is fixed around the outside of the inner tube of the hood, the plurality of deflector plates are arranged vertically, gaps are left between adjacent deflector plates, and the plurality of deflector plates are arranged in sequence upward and outward, with the lower deflector plate closer to the inside and the upper deflector plate closer to the outside, and the overall structure is larger at the top and smaller at the bottom; the bottom of the deflector plate is tilted outward, which is an outward bending structure to increase the air intake.

[0014] The upper part of the hood is provided with a hood cover, which is fixed to the upper part of the hood by steel plate reinforcement; the upper surface of the hood cover is provided with an upper guide cone, and the lower surface is provided with a lower guide cone; the hood cover is surrounded by a hood smoke exhaust port.

[0015] The lower outer wall of the hood is provided with hood ears, which are convenient for installing and fixing the hood on the top of the house building, and are inserted into the air inlet of the pipeline and fixed on the hood ears.

[0016] There are multiple inserted pipes, which are arranged around the flue in the hood; the air outlets of the multiple inserted pipes are inserted into the exhaust port of the flue in the hood. The multiple inserted pipes arranged around the flue in the hood can be arranged in the same layer or in multiple layers around the flue in the hood.

[0017] The hood is square in shape, and its four sides are provided with inserted pipes, and the four inserted pipes are embedded in the four sides of the flue in the hood, forming five smoke exhaust ports of the flue in the hood and four inserted pipe air outlets in the middle of the hood; among them: one smoke exhaust port of the flue in the hood is located in the center, and the other four smoke exhaust ports of the flue in the hood are located in the four corners, and the four inserted pipe air outlets are located on the four sides, and the four inserted pipe air outlets and the four inserted pipe air outlets are arranged at intervals around the smoke exhaust port of the flue in the hood in the center.

[0018] The steel plate frame is arranged at the four corners of the upper part of the hood, the jet flow plate is connected to the steel plate frame, and the four corners of the upper cover of the hood are pulled on the steel plate frame at the four corners by steel plate tie bars.

[0019] The outer shape of the hood can be any shape, such as square, round, diamond, etc.

[0020] A method for using an ejection flow air extraction hood for building construction, using the hood, comprises the following steps:

[0021] The hood is installed on a smoke exhaust duct which is smaller than the area of ​​the bottom of the hood. A parapet is built around the hood, and the hood is installed on the surrounding parapet with expansion bolts passing through the ears of the hood; the natural wind from the outside enters the inserted pipe through the air inlet of the inserted pipe, and the inserted pipe is a variable diameter air duct. When it passes through the air outlet of the inserted pipe, a pressure change effect is generated; the natural wind from the outside is drained through the air inlet of the inserted pipe, and is ejected through the air outlet of the inserted pipe to generate a jet. When the jet blows the smoke in the inner tube of the hood, negative pressure is generated, and the smoke in the smoke duct in the hood is pulled out. The drainage is first used, and then the jet is used to blow the smoke in the smoke duct in the hood, so that a negative pressure effect of air extraction is generated inside the smoke exhaust duct below the hood.

[0022] The present invention does not require power, but uses natural wind from the outside. It first takes in air through the air inlet of the inserted pipe, and then discharges air through the air outlet of the inserted pipe. It cooperates with the guide flow plate and the upper guide cone in the wind hood to produce multiple points of guide jets and air extraction effects, so that a strong and long-term negative pressure is generated in the smoke exhaust airway under the wind hood, increasing the amount of smoke discharged from the smoke exhaust airway. Using the present invention, the size of the smoke exhaust airway can be reduced by 1 / 3, the use area of ​​the kitchen or bathroom can be expanded, materials can be saved, and energy consumption can be reduced. The present invention prevents backflow and smoke reflux caused by natural wind, and avoids odor transfer between households.

[0023] The present invention is substantially different from the prior art. The prior art all hopes that the natural wind is as small as possible. The present invention is just the opposite. The larger the natural wind, the better the effect and the less backflow. When the weather is windless, the air temperature and the temperature inside the hood produce a thermal pressure difference, forming a driving force, exhausting the smoke downward from the gap of the hood's ejector plate, and the hood's smoke exhaust port discharges the smoke upward, which can make the gas flow around the hood form an upward drainage, jet, and air extraction effect. The present invention is windproof, rainproof, snowproof, and backflow-proof, has no rotating parts, no mechanical failures, and is maintenance-free.

[0024] The positive effects of the present invention are as follows: the hood structure is improved, an insertion pipe is provided on at least one side of the hood to form drainage, jet and air extraction effects with the smoke exhaust airway, and the exhaust effect is improved by the drainage jet flow to increase the exhaust volume. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0026] Figure 2 is a schematic top view of the overall structure of Embodiment 1 of the present invention;

[0027] Figure 3 This is a schematic diagram of the AA cross-sectional structure of the first embodiment of the present invention;

[0028] Figure 4 is a schematic diagram of the hood structure of Embodiment 1 of the present invention;

[0029] Figure 5 is a schematic diagram of a top view of the structure of a hood according to a first embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the structure of the hood upper cover of the first embodiment of the present invention;

[0031] Figure 7 This is a schematic diagram of the top view of the hood cover of Embodiment 1 of the present invention;

[0032] Figure 8 It is a schematic diagram of the internal structure of the first embodiment of the present invention;

[0033] Fig. 9 It is a schematic diagram of a top view of the internal structure of the first embodiment of the present invention;

[0034] Fig.10 is a schematic diagram of an internal airflow channel in a first embodiment of the present invention;

[0035] Fig.11 is a schematic diagram of the internal airflow channel of the second embodiment of the present invention;

[0036] Fig.12 is a schematic structural diagram of Embodiment 3 of the present invention;

[0037] Fig.13 This is a schematic diagram of the structure of the air outlet of the inserted pipe according to the third embodiment of the present invention;

[0038] Fig.14 This is a schematic diagram of the structure of an air outlet inserted into a pipe according to a first embodiment of the present invention;

[0039] In the figure: smoke exhaust duct 1, hood ears 2, inserted pipe air inlet 3, inserted pipe air outlet 4, hood inner pipe 5, guide flow plate 6, steel plate frame 7, hood upper cover 8, steel plate tensioning 9, upper guide cone 10, lower guide cone 11, hood smoke exhaust port 12, hood inner flue smoke exhaust port 13, inserted pipe 14, inward convergence structure 15, outlet cover 16, vertical pole 17, limit bolt 18, bending structure 19, bent outer edge 20. DETAILED DESCRIPTION

[0040] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0041] A jet flow air extraction hood for building construction is arranged on the top of a smoke exhaust duct 1, comprising an inner smoke duct in the hood, an inserted pipe air inlet 3, an inserted pipe air outlet 4, an inner smoke duct exhaust port 13 and an inserted pipe 14; the inner smoke duct in the hood is connected with the smoke exhaust duct 1 at the bottom, the inner smoke duct in the hood extends upward to the middle of the hood, the inserted pipe 14 is inserted upward into the inner smoke duct in the hood from the outer side of the inner smoke duct in the hood, the number of inserted pipes 14 is more than one, the inserted pipe air inlet 3 is located outside the lower part of the hood, the inserted pipe air outlet 4 is located in the middle of the hood, the inner smoke duct exhaust port 13 of the inner smoke duct in the hood and the inserted pipe air outlet 4 are merged in the middle of the hood, and the inserted pipe air outlet 4 is inserted into the inner smoke duct exhaust port 13 of the hood.

[0042] The inserted pipe 14 is a variable diameter air duct, the inner diameter of the inserted pipe air inlet 3 is the largest, the inner diameter gradually decreases, and the inner diameter of the inserted pipe air outlet 4 is the smallest. That is, the inserted pipe 14 is a variable diameter air duct, and the cross-sectional area of ​​the inserted pipe air inlet 3 is larger than the cross-sectional area of ​​the inserted pipe air outlet 4.

[0043] The middle part of the hood is provided with an inner hood tube 5, the outlet of the hood internal flue smoke exhaust port 13 and the inserted pipe air outlet 4 are located in the inner hood tube 5, and the height of the inner hood tube 5 is greater than the outlet of the hood internal flue smoke exhaust port 13 and the inserted pipe air outlet 4. The greater the height difference, the better the drainage jet and air extraction effect.

[0044] The overall shape of the insertion pipe 14 is arbitrary, for example: an L-shaped insertion pipe, a straight insertion pipe, etc.

[0045] The inserted pipe air inlet 3 is in a trumpet shape, which is large on the outside and small on the inside. The outside is a rectangular inlet, and the inside is connected to the inserted pipe air outlet. The cross-sectional area of ​​the inserted pipe air outlet is 1 / 4 of the cross-sectional area of ​​the inserted pipe air inlet.

[0046] In embodiment 1, the insert pipe 14 is an L-shaped insert pipe, which is composed of a horizontal section and a vertical section. The inlet of the horizontal section is the insert pipe air inlet 3, which is located outside the lower part of the hood, and the outlet of the vertical section is the insert pipe air outlet 4, which is located in the middle of the hood. The hood internal flue and the vertical section of the insert pipe 14 are arranged in the hood, and the hood internal flue exhaust port 13 of the hood internal flue merges with the insert pipe air outlet 4 in the middle of the hood.

[0047] A deflector plate 6 and a steel plate frame 7 are provided in the middle of the hood, a plurality of deflector plates 6 are fixed on the steel plate frame 7, the steel plate frame 7 is fixed around the outside of the hood inner tube 5, the plurality of deflector plates 6 are arranged vertically, gaps are left between adjacent deflector plates 6, the plurality of deflector plates 6 are arranged in sequence upward and outward, the lower deflector plates are close to the inside, the upper deflector plates are close to the outside, and the overall structure is larger at the top and smaller at the bottom.

[0048] The upper part of the hood is provided with a hood cover 8, which is fixed to the upper part of the hood by steel plate reinforcement 9; the upper surface of the hood cover 8 is provided with an upper guide cone 10, and the lower surface is provided with a lower guide cone 11; the hood cover 8 is surrounded by a hood smoke exhaust port 12.

[0049] A hood ear 2 is provided on the outer wall of the lower part of the hood, which is convenient for installing and fixing the hood on the top of the building, and is inserted into the air inlet of the pipeline and fixed on the hood ear.

[0050] The number of the inserted pipes is multiple, and they are arranged around the flue in the hood; the multiple inserted pipe outlets 4 are inserted into the smoke exhaust port 13 of the flue in the hood together. The multiple inserted pipes arranged around the flue in the hood can be arranged in the same layer, or in multiple layers around the flue in the hood.

[0051] In this embodiment, refer to the attached Figure 2 The hood is square in shape, and its four sides are provided with inserted pipes 14. The four inserted pipes 14 are embedded in the four sides of the flue in the hood, and five flue exhaust ports 13 in the hood and four inserted pipe air outlets 4 are formed in the middle of the hood; wherein: one flue exhaust port in the hood is located in the center, and the other four flue exhaust ports in the hood are located in the four corners, and the four inserted pipe air outlets are located on the four sides, and the four inserted pipe air outlets and the four inserted pipe air outlets are arranged at intervals around the flue exhaust port in the hood in the center.

[0052] The steel plate frame 7 is arranged at the four corners of the upper part of the hood, the jet flow plate 6 is connected to the steel plate frame 7, and the four corners of the hood upper cover 8 are pulled on the steel plate frame at the four corners by steel plate tie bars 9.

[0053] See attached Fig.14An air outlet cover 16 is provided on the inserted pipe air outlet 4 through a hinge shaft, and the air outlet cover 16 does not completely cover the inserted pipe air outlet 4, but only covers 1 / 4 to 3 / 4 of the inserted pipe air outlet 4; an air outlet cover limiting mechanism is also provided on the inserted pipe air outlet 4, and the air outlet cover limiting mechanism is composed of a vertical rod 17 and a limiting bolt 18. The vertical rod 17 is vertically arranged on the inserted pipe air outlet 4 and is located behind the air outlet cover 16. A limiting bolt 18 is provided on the vertical rod 17, and the limiting bolt 18 matches the air outlet cover 16 to limit the flipping angle of the air outlet cover 16, and the flipping angle is less than 90 degrees.

[0054] The area of ​​the air outlet cover 16 is smaller than the area of ​​the inserted pipe air outlet 4, and has a pressure-changing effect. When the wind force is small, the air outlet cover 16 does not flip over and covers the inserted pipe air outlet 4. When the wind force is large, the air outlet cover 16 is blown to flip over, and the air outlet cover limiting mechanism limits the flipping range of the air outlet cover 16.

[0055] A method for using an ejection flow air extraction hood for building construction, using the hood, comprises the following steps:

[0056] The hood is installed on the smoke exhaust duct 1 which is smaller than the area of ​​the bottom of the hood. A parapet is built around the hood, and the hood is installed on the surrounding parapet with expansion bolts passing through the hood ears 2; the natural wind from the outside enters the insertion pipe 14 through the insertion pipe air inlet 3. The insertion pipe 14 is a variable diameter air duct. When it passes through the insertion pipe air outlet 4, a pressure change effect is generated; the natural wind from the outside is drained through the insertion pipe air inlet 3, and is ejected through the insertion pipe air outlet 4 to generate a jet. When the jet blows the smoke in the inner tube 5 of the hood, negative pressure is generated, and the smoke in the smoke duct in the hood is pulled out. The drainage is first used, and then the jet is used to blow the smoke in the smoke duct in the hood, so that a negative pressure effect of air extraction is generated inside the smoke exhaust duct below the hood.

[0057] The steel plate frame 7 is arranged at the four corners of the upper part of the hood, and the jet guide plate 6 is connected to the steel plate frame 7. The external natural wind generates a jet through the jet guide plate. Since the jet guide plate is arranged to diffuse vertically upward, the wind is guided upward, so that a jet negative pressure is generated inside the hood, driving the smoke in the hood to be discharged upward at high speed.

[0058] The four corners of the hood cover 8 are pulled on the steel plate frame at the four corners by steel plate tie bars 9. The lower guide cone 11 of the hood cover allows the natural wind to flow upward, so that the hood smoke exhaust port 12 around the hood cover forms an air extraction effect, and the upper guide cone 10 of the hood cover allows the smoke discharged from the inside of the hood to be diverted and discharged. When the smoke collides with the upper guide cone, it will not rebound and the discharge is smooth.

[0059] The hood cover must be larger than the size of the hood inner pipe to prevent rainwater from leaking into the main pipe.

[0060] Embodiment 2, refer to the attached Fig.11. An inner tube 5 is provided in the middle of the hood, and the outlet of the smoke exhaust port 13 of the flue in the hood and the air outlet 4 of the inserted pipe are located in the inner tube 5 of the hood, and the height of the inner tube 5 of the hood is greater than the outlet of the smoke exhaust port 13 of the flue in the hood and the air outlet 4 of the inserted pipe. The greater the height difference, the better the drainage jet and air extraction effects. The top of the inner tube 5 of the hood is an inwardly converging structure 15, so that the inner diameter of the top opening of the inner tube 5 of the hood is smaller than the inner diameter of the bottom of the inner tube 5 of the hood, so that the jet guide plate 6 on the periphery of the inner tube 5 of the hood produces an upward jet, drainage and air extraction effect.

[0061] The bottom of the jet guide plate 6 is tilted outwards to form an outward bending structure 19, which increases the air intake.

[0062] Embodiment 3, refer to the attached Fig.12 , 13 The insertion pipe 14 is a straight insertion pipe, which is a variable diameter pipe and is inserted straight upward into the flue in the hood. The insertion pipe air inlet 3 is located outside the lower part of the hood, and the insertion pipe air outlet 4 is located in the middle of the hood. The hood flue exhaust port 13 of the hood flue and the insertion pipe air outlet 4 meet in the middle of the hood.

[0063] The inserted pipe 14 is inserted straight and obliquely, keeping the smoke exhaust port 13 in the hood flush with the inserted pipe air outlet 4; an air outlet cover 16 is provided on the inserted pipe air outlet 4 through a hinge shaft, and the air outlet cover 16 does not completely cover the inserted pipe air outlet 4, but only covers 1 / 4 to 3 / 4 of the inserted pipe air outlet 4; an air outlet cover limiting mechanism is also provided on the inserted pipe air outlet 4, and the air outlet cover limiting mechanism is composed of a vertical rod 17 and a limiting bolt 18, the vertical rod 17 is vertically arranged on the inserted pipe air outlet 4, and is located behind the air outlet cover 16, and a limiting bolt 18 is provided on the vertical rod 17, and the limiting bolt 18 matches the air outlet cover 16 to limit the flipping angle of the air outlet cover 16, and the flipping angle is less than 90 degrees.

[0064] The area of ​​the air outlet cover 16 is smaller than the area of ​​the inserted pipe air outlet 4, and has a pressure-changing effect. When the wind force is small, the air outlet cover 16 does not flip over and covers the inserted pipe air outlet 4. When the wind force is large, the air outlet cover 16 is blown to flip over, and the air outlet cover limiting mechanism limits the flipping range of the air outlet cover 16.

[0065] The bottom of the jet guide plate 6 is tilted outwards to form an outward bending structure 19, which increases the air intake.

[0066] The top of the hood inner tube 5 is an inward convergent structure 15, so that the inner diameter of the top opening of the hood inner tube 5 is smaller than the inner diameter of the bottom of the hood inner tube 5, which is convenient for the guide flow plate 6 on the periphery of the hood inner tube 5 to produce upward jet, drainage and air extraction effects. The outer edges of the hood upper cover 8 are downwardly bent outer edges 20, which match the inward convergent structure 15 of the hood inner tube 5 below to prevent rainwater from entering. This structure makes the hood inner tube 5 a variable pressure structure to prevent backflow.

[0067] Product performance features: The present invention does not require power, but uses natural wind from the outside. It first takes in air through the air inlet of the inserted pipe, and then discharges air through the air outlet of the inserted pipe. It cooperates with the guide flow plate and the lower guide cone in the wind hood to produce multiple points of guide jets and air extraction effects, so that a strong and long-term negative pressure is generated in the exhaust air duct under the wind hood, increasing the exhaust volume of the exhaust air duct. Using the present invention, the size of the exhaust air duct can be reduced by 1 / 3, the use area of ​​the kitchen or bathroom can be expanded, materials can be saved, and energy consumption can be reduced. The present invention prevents backflow and smoke reflux caused by natural wind, and avoids odor transfer between households.

[0068] The function of the upper guide cone is to change the wind direction no matter which direction the wind comes from, thus producing an air extraction effect. The jet flow guide plate is arranged vertically, and no matter which direction the wind comes from, it can be converted into upward power, thus producing an air extraction effect. The present invention has both internal and external drainage and jet air extraction effects.

Claims

1. An ejector air hood for building construction, arranged at the top of a smoke exhaust duct (1), characterized in that: The invention comprises an inner flue of the hood, an inserted pipe air inlet (3), an inserted pipe air outlet (4), an inner flue smoke outlet (13) and an inserted pipe (14); the inner flue of the hood is connected with the smoke exhaust duct (1) at the bottom, the inner flue of the hood extends upward to the middle of the hood, the inserted pipe (14) is inserted upward into the inner flue of the hood from the outer surface of the inner flue of the hood, the number of the inserted pipes (14) is more than one, the inserted pipe air inlet (3) is located outside the lower part of the hood, the inserted pipe air outlet (4) is located in the middle of the hood, the inner flue smoke outlet (13) of the inner flue of the hood and the inserted pipe air outlet (4) are merged in the middle of the hood, and the inserted pipe air outlet (4) is inserted into the inner flue smoke outlet (13) of the hood.

2. The induced flow air extraction hood for building construction according to claim 1, characterized in that: The inserted pipe (14) is a variable diameter air duct, the inner diameter is the largest at the inserted pipe air inlet (3), the inner diameter gradually decreases, and the inner diameter is the smallest at the inserted pipe air outlet (4).

3. The induced flow air extraction hood for building construction according to claim 1 or 2, characterized in that: A hood inner tube (5) is provided in the middle of the hood, the outlet of the hood inner flue smoke exhaust port (13) and the inserted pipe air outlet (4) are located in the hood inner tube (5), and the height of the hood inner tube (5) is greater than the height of the outlet of the hood inner flue smoke exhaust port (13) and the inserted pipe air outlet (4).

4. The induced flow air extraction hood for building construction according to claim 1 or 2, characterized in that: The inserted pipe air inlet (3) is in the shape of a trumpet, which is larger on the outside and smaller on the inside. The outside is a rectangular inlet, and the inside is connected to the inserted pipe air outlet. The cross-sectional area of ​​the inserted pipe air outlet is 1 / 4 of the cross-sectional area of ​​the inserted pipe air inlet.

5. The induced flow air extraction hood for building construction according to claim 1 or 2, characterized in that: A deflector plate (6) and a steel plate frame (7) are provided in the middle of the hood. A plurality of deflector plates (6) are fixed on the steel plate frame (7). The steel plate frame (7) is fixed around the outside of the inner tube (5) of the hood. The plurality of deflector plates (6) are arranged vertically. A gap is left between adjacent deflector plates (6). The plurality of deflector plates (6) are arranged in sequence upward and outward. The lower deflector plates are closer to the inside and the upper deflector plates are closer to the outside. The overall structure is larger at the top and smaller at the bottom. The bottom of the deflector plate (6) is tilted outward and is an outward bending structure (19) to increase the air intake.

6. The induced flow air extraction hood for building construction according to claim 1 or 2, characterized in that: The upper part of the hood is provided with a hood upper cover (8), which is fixed to the upper part of the hood by steel plate tie bars (9); the upper surface of the hood upper cover (8) is provided with an upper guide cone (10), and the lower surface is provided with a lower guide cone (11); and the hood upper cover (8) is surrounded by a hood smoke exhaust port (12).

7. The induced flow air extraction hood for building construction according to claim 1 or 2, characterized in that: The hood is square in shape, and its four sides are each provided with an insert pipe (14), and the four insert pipes are embedded in the four sides of the hood internal flue, forming five hood internal flue smoke exhaust ports (13) and four insert pipe air outlets (4) in the middle of the hood; wherein: one hood internal flue smoke exhaust port is located in the center, and the other four hood internal flue smoke exhaust ports are located at the four corners, and the four insert pipe air outlets are located at the four sides, and the four insert pipe air outlets and the four insert pipe air outlets are arranged at intervals around the hood internal flue smoke exhaust port in the center.

8. The induced flow air extraction hood for building construction according to claim 3, characterized in that: The top of the hood inner tube (5) is an inwardly converging structure (15), so that the inner diameter of the top opening of the hood inner tube (5) is smaller than the inner diameter of the bottom of the hood inner tube (5), so that the guide flow plate (6) on the periphery of the hood inner tube (5) can generate an upward jet, drainage and air extraction effect; the outer edges of the hood upper cover (8) are downwardly bent outer edges (20), and the downwardly bent outer edges (20) match the inwardly converging structure (15) of the hood inner tube (5) below to prevent rainwater from entering.

9. The induced flow air extraction hood for building construction according to claim 3, characterized in that: An air outlet cover (16) is provided on the inserted pipe air outlet (4) via a hinge shaft, and the air outlet cover (16) does not completely cover the inserted pipe air outlet (4); an air outlet cover limiting mechanism is also provided on the inserted pipe air outlet (4), and the air outlet cover limiting mechanism is composed of a vertical rod (17) and a limiting bolt (18), the vertical rod (17) is vertically arranged on the inserted pipe air outlet (4), and is located behind the air outlet cover (16), and a limiting bolt (18) is provided on the vertical rod (17), and the limiting bolt (18) matches the air outlet cover (16) to limit the flip angle of the air outlet cover (16), and the flip angle is less than 90 degrees.

10. A method for using an ejection flow air extraction hood for building construction, using the hood defined in any one of claims 1 to 9, characterized in that The following steps are included: The hood is installed on a smoke exhaust duct (1) smaller than the area of ​​the bottom of the hood, a parapet is built around the hood, and the hood is installed on the surrounding parapet by passing expansion bolts through the hood ears (2); the natural wind from the outside enters the inserted pipe (14) through the inserted pipe air inlet (3), and the inserted pipe (14) is a variable diameter air duct. When passing through the inserted pipe air outlet (4), a pressure change effect is generated; the natural wind from the outside is guided through the inserted pipe air inlet (3) and ejected through the inserted pipe air outlet (4), generating a jet. When the jet blows the smoke in the inner tube (5) of the hood, negative pressure is generated, and the smoke in the smoke duct in the hood is drawn out. The smoke in the smoke duct in the hood is blown out by the jet, so that a negative pressure effect of air extraction is generated inside the smoke exhaust duct below the hood.

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