Wind cap

Abstract

The utility model belongs to the technical field of building exhaust duct systems, and provides an air cap which is arranged at a roof outlet of a building exhaust duct and comprises a first vertical ventilation pipe, a rainproof cover plate arranged above the air outlet end of the top of the first vertical ventilation pipe and a wind shielding device arranged on the peripheral side of the rainproof cover plate. An external exhaust channel is formed among the wind shielding device, the rainproof cover plate and the top air outlet end of the first vertical ventilation pipe, the wind shielding device comprises movable blades, and when air with certain airflow pressure in the building exhaust channel enters the external exhaust channel, the movable blades are blown open outwards, and the area of an exhaust port of the external exhaust channel is increased; and when the gas in the building exhaust passage is smaller than a certain airflow pressure, the movable blade returns. The wind cap solves the problems that in the prior art, a wind cap with a rainproof wind shield is large in exhaust resistance and large in noise.

Description

Technical Field

[0001] The present application belongs to the technical field of building exhaust duct systems, and more specifically, to a hood. Background Art

[0002] At present, the roof hood used in the building exhaust duct system is used to prevent wind, rain and snow from flowing back into the exhaust duct and facilitate the exhaust gas discharge. However, in the existing hood structure, rainproof and windshield plates are arranged around the top rainproof cover plate. Although an external exhaust channel is formed between the exhaust duct and the top rainproof cover plate and the rainproof and windshield plates, the rainproof and windshield plates are arranged around the circumference, making the exhaust resistance of the external exhaust channel relatively large, which is not conducive to the exhaust of exhaust gas in the building exhaust duct. In particular, the hood with a fan has large wind resistance and generates large noise and environmental pollution. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a hood, aiming to solve the problem of high exhaust resistance and high noise in the hood with rainproof wind shield in the prior art.

[0004] To achieve the above-mentioned purpose, the technical solution adopted in the embodiment of the present application is: to provide a wind hood, which is arranged at the roof outlet of the building exhaust duct, including a first vertical air-through pipe, and a rainproof cover plate arranged above the top air outlet end of the first vertical air-through pipe, and also including a windshield device arranged on the surrounding side of the rainproof cover plate, and an external exhaust channel is formed between the windshield device, the rainproof cover plate, and the top air outlet end of the first vertical air-through pipe. The windshield device includes movable blades. When gas with a certain airflow pressure in the building exhaust duct enters the external exhaust channel, the movable blades are blown outward to increase the exhaust port area of ​​the external exhaust channel; when the gas in the building exhaust duct is less than a certain airflow pressure, the movable blades return to their positions.

[0005] Specifically, the windshield device includes a rainproof and windshield plate arranged around the outside of the first vertical air-permeable pipe, the rainproof and windshield plate is provided with at least one opening, and the movable blades are arranged outside the opening.

[0006] Specifically, the opening is located in the middle of the rainproof and windshield plate; or, the opening is located at the upper end or the lower end of the rainproof and windshield plate and extends to the upper edge or the lower edge of the rainproof and windshield plate; or, the opening passes through the rainproof and windshield plate horizontally or vertically.

[0007] Specifically, the wind shielding device includes a bracket arranged along the circumference of the first vertical hollow tube, and the movable blades are multiple, and the multiple movable blades are evenly arranged on the bracket along the circumference of the first vertical hollow tube.

[0008] Specifically, the movable blades located on the same side are arranged in one layer, or are arranged in at least two layers longitudinally.

[0009] Specifically, the movable blade controls the increase or decrease of its movable angle through an electric control device, and the electric control device controls its opening or closing through at least one of time, pressure, flow, and temperature.

[0010] Specifically, a motor and an impeller driven by the motor are arranged in the first vertical air-permeable pipe, and the impeller blades are fixed or retractable.

[0011] Specifically, a second vertical empty pipe is arranged around the outer side of the first vertical empty pipe, a second exhaust channel is formed between the first vertical empty pipe and the second vertical empty pipe, a check device is arranged at the top or bottom of the second exhaust channel or inside the second exhaust channel, when the motor drives the impeller to exhaust air, the check device closes the second exhaust channel, when the motor turns off the impeller to stop exhausting air, the check device opens the second exhaust channel.

[0012] Specifically, the non-return device is controlled to be opened or closed by an electric device or pneumatic force and / or gravity or spring force.

[0013] Specifically, a sound-absorbing layer is provided on the inner bottom surface of the rainproof cover; and / or, protrusions are provided on the outer top surface and / or the inner bottom surface of the rainproof cover, and / or, a hole is provided on the rainproof cover, and a baffle is fixedly or movably provided on the hole.

[0014] In the present application, an opening is added to the rainproof and windshield plate of the hood, and a movable blade that can open / close the opening is provided at the opening. When exhaust is required, the movable blade is opened, and exhaust is discharged through the opening and the external exhaust channel, thereby increasing the effective exhaust area of ​​the hood, thereby reducing the local resistance of the hood, improving the ventilation efficiency of the exhaust duct system, and reducing noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 A schematic cross-sectional view of a hood provided in Embodiment 1 of the present application;

[0017] Figure 2 for Figure 1 A top view schematic diagram of

[0018] Figure 3 This is a schematic diagram of the structure of the rainproof and windshield plate in the first embodiment of the present application;

[0019] Figure 4 This is a schematic diagram of the structure of another rainproof and windshield plate in the first embodiment of the present application;

[0020] Figure 5 This is a schematic diagram of the structure of another rainproof and windshield plate in the first embodiment of the present application;

[0021] Figure 6 A cross-sectional schematic diagram of a hood provided in Embodiment 2 of the present application;

[0022] Figure 7 for Figure 6 A top view schematic diagram of

[0023] Figure 8 This is a schematic diagram of the structure of the rainproof and windshield plate in the second embodiment of the present application;

[0024] Fig. 9 A cross-sectional schematic diagram of a hood provided in Embodiment 3 of the present application;

[0025] Fig.10 for Fig. 9 A top view schematic diagram of

[0026] Fig.11 A cross-sectional schematic diagram of a hood provided in Embodiment 4 of the present application;

[0027] Fig.12 for Fig.11 Schematic top view of .

[0028] Among them, the reference numerals in the figure are:

[0029] 10-first vertical air-through pipe; 11-mounting plate; 12-screw hole; 13-second vertical air-through pipe; 14-second exhaust channel; 15-check device;

[0030] 20-rain cover; 30-rain and wind shield; 31-opening; 32-movable blades; 40-fixed connector;

[0031] 50-gap; 70-air outlet; 80-bump; 90-motor; 91-impeller. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0033] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0034] It should be understood that the directions or positional relationships indicated by terms such as "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present application.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, and "several" means one or more, unless otherwise clearly and specifically defined.

[0036] The present application provides a hood which is arranged at the roof outlet of a building exhaust duct, and comprises a first vertical air-through pipe and a rainproof cover plate arranged above the top air outlet end of the first vertical air-through pipe, and also comprises a windshield device arranged on the periphery of the first vertical air-through pipe, an external exhaust passage is formed between the windshield device, the rainproof cover plate and the top air outlet end of the first vertical air-through pipe, and movable blades are arranged on the windshield device. When gas with a certain airflow pressure in the building exhaust duct enters the external exhaust passage, the movable blades are blown outwards to increase the exhaust port area of ​​the external exhaust passage; when the gas in the building exhaust duct is less than a certain airflow pressure, the movable blades return to their positions.

[0037] In the present application, movable blades are provided on the wind shielding device. When the exhaust flow rate increases, the movable blades are blown outward, increasing the exhaust port area of ​​the external exhaust channel, thereby reducing the local resistance of the hood, improving the ventilation efficiency of the exhaust duct system, and reducing noise.

[0038] On the basis of achieving the above technical effects, the hood can have a variety of structures, and the hood structure is described in detail below with reference to specific drawings.

[0039] Embodiment 1

[0040] Reference Figure 1 , Figure 2A hood provided in Example 1 of the present application includes a first vertical air-through pipe 10, a rainproof cover plate 20 arranged above the top air outlet end of the first vertical air-through pipe 10, and a windshield device arranged on the side of the rainproof cover plate 20, and an external exhaust channel is formed between the windshield device, the rainproof cover plate 20, and the top air outlet end of the first vertical air-through pipe 10.

[0041] Specifically, the windshield device includes a rainproof windshield plate 30 and a movable blade 32 which are arranged around the outside of the first vertical air-permeable pipe. The rainproof windshield plate 30 is provided with at least one opening 31 , and the movable blade 32 is arranged outside the opening 32 .

[0042] The rainproof windshield 30, the rainproof cover 20 and the first vertical hollow tube 10 are fixed by a fixed connector 40. The lower side end of the fixed connector 40 is fixed to the outer wall of the first vertical hollow tube 10, the top end of the fixed connector 40 is fixed to the rainproof cover 20, and the side end of the fixed connector 40 is fixed to the rainproof windshield 30. In this way, the rainproof cover 20 and the rainproof windshield 30 are fixed by one fixed connector 40. Of course, the rainproof cover 20 and the rainproof windshield 30 can also be fixed by two fixed connectors 40 respectively.

[0043] In this embodiment, an external exhaust passage is formed between the rain cover 20, the rain and wind shield 30 and the air outlet end at the top of the first vertical air-through pipe. There is a gap 50 between the rain cover 20 and the rain and wind shield 30, and the external exhaust passage has an air outlet 70 facing upward through the gap 50 and an air outlet 70 facing downward through the gap 50. In this way, while ensuring that the gas in the building exhaust passage can be discharged through the air outlet 70 facing upward through the gap 50 and the air outlet 70 facing downward through the gap 50, it also effectively prevents rain, snow and wind from flowing back into the building exhaust passage. Of course, there may be no gap 50 between the rain cover 20 and the rain and wind shield 30, and the gas in the external exhaust passage cannot be discharged upward.

[0044] At least one opening 31 is provided on the rainproof and windshield plate 30 (four openings 31 are shown in the figure, i.e., one opening is provided in each of four directions), and a movable blade 32 is provided on the outside of the opening 31 to open / cover the opening 31. When the gas with a certain airflow pressure in the building exhaust duct enters the external exhaust channel, that is, during the peak exhaust time of lunch and dinner, the gas can be discharged from the opening 31, the air outlet 70 of the gap 50 and the downward air outlet 70 through the increased angle of the movable blade 32, thereby increasing the exhaust area, reducing the exhaust resistance, and reducing the noise; when the gas in the building exhaust duct is less than a certain airflow pressure, that is, during the non-peak exhaust time, the movable blade 32 returns to cover the opening 31 to prevent the external rain and wind from flowing back into the building exhaust duct. That is, in this embodiment, on the basis of the existing exhaust outlet 70 and the downward air outlet 70 of the exhaust gap 50, exhaust from the opening 31 is added to increase the exhaust area.

[0045] Please refer to Figure 3 In this embodiment, the opening 31 is located in the middle of the rainproof and windshield plate 30. As an alternative, refer to Figure 4 , the opening 31 may also be located at the upper end of the rainproof and windshield plate 30 and extend to the upper edge of the rainproof and windshield plate 30; Figure 5 The opening 31 may also be located at the lower end of the rainproof and windshield plate 30 and extend to the lower edge of the rainproof and windshield plate 30 .

[0046] In this embodiment, the upper end of the movable blade 32 is hinged on the rainproof windshield 30, and the lower end of the movable blade 32 is a movable end. The lower end of the movable blade 32 rotates around the upper end hinge point to increase the angle or cover the opening 31. In this embodiment, the movable blade 32 is blown by a certain air flow to increase the angle, and when the air flow is lower than a certain amount, the movable blade 32 uses its own weight to fall and cover the opening 31. Therefore, the upper end of the movable blade 32 is hinged, and the lower end is a movable end, which is also more convenient for it to fall by its own weight.

[0047] In this embodiment, a mounting plate 11 is provided at the bottom of the first vertical hollow pipe 10, and the mounting plate 11 is arranged in a closed loop along the circumference of the first vertical hollow pipe 10. Of course, the mounting plate 11 can also be arranged in a non-closed loop. The mounting plate 11 is provided with screw holes 12, which are used to install expansion screws to connect with the concrete base of the exhaust duct outlet, or to connect with the flange with bolts to fix the entire hood.

[0048] As an alternative, the movable blade 32 can also be controlled by an electric control device (not shown in the figure) to increase or decrease its activity angle. When the electric control device is used to control the change of the angle of the movable blade 32, the installation of the movable blade 32 is not limited, and it can be hinged at the upper end or not. The opening or closing of the electric control device can be controlled by at least one of time setting, pressure, flow or temperature.

[0049] In this embodiment, a sound-absorbing layer (not shown) is provided on the inner bottom surface of the rainproof cover plate 20 to better reduce noise when the hood is working.

[0050] As an alternative, the rainproof windshield 30 may be omitted from the windshield device, that is, the windshield device includes a bracket arranged along the periphery of the first vertical air-through pipe 10, and there are multiple movable blades 32, and the multiple movable blades are evenly arranged on the bracket along the periphery of the first vertical air-through pipe 10. In this way, when the movable blades 32 are not blown up, the multiple movable blades 32 enclose the equivalent of the rainproof windshield 30, playing the role of wind and rain protection, and preventing external rain and wind from flowing back into the exhaust duct of the building. When the bracket is used to fix the movable blades 32, the movable blades 32 can be arranged on the front, rear, left and right sides of the rainproof cover 20, and the movable blades 32 on the same side are one layer, or are arranged longitudinally in at least two layers.

[0051] Embodiment 2

[0052] Reference Figure 6 , Figure 7 The hood provided in the second embodiment of the present application is different from that in the first embodiment in two main aspects:

[0053] 1. In this embodiment, a protrusion 80 is provided on the outer top surface of the rainproof cover 20. The protrusion 80 increases the strength of the rainproof cover 20. Of course, a protrusion can also be provided on the inner bottom surface of the rainproof cover 20 to facilitate the diffusion of the gas discharged from the first vertical air-through pipe 10 to the surroundings. At the same time, the built-in protrusion also increases the strength of the rainproof cover 20 and reduces the local resistance of the hood. Alternatively, a hole (not shown in the figure) can be opened on the rainproof cover 20, and a baffle can be fixedly or movably provided above the hole. The baffle can open the hole to increase the exhaust area, which is conducive to smooth exhaust.

[0054] Second, in this embodiment, the rainproof windshield plate 30 arranged along the circumference of the rainproof cover plate 20 is not in a closed and surrounding shape, that is, the opening 31 is not a through hole, but cuts off the rainproof windshield plate surface from top to bottom, and the rainproof windshield plate 30 has a cross section, that is, Figure 8 As shown, the opening 31 penetrates the rainproof windshield 30 longitudinally. Of course, the opening 31 can also penetrate the rainproof windshield 30 transversely. Two layers of movable blades 32 are longitudinally arranged at each opening 31. When exhausting, both layers of movable blades 32 are opened, and the gas can be discharged from the opening 31. With such a structure, the effective flow area of ​​the opening 31 is larger and the exhaust effect is better. More layers of movable blades 32 can also be arranged. The smaller the movable blades 32 are, the lighter the mass is, and the smaller the air pressure is, the more the movable blades 32 can be blown open for exhaust.

[0055] The other structures in this embodiment are the same as those in the first embodiment and will not be described again here.

[0056] Embodiment 3

[0057] Reference Fig. 9 , Fig.10 The hood provided in the third embodiment of the present application is different from that in the first embodiment in the following four aspects:

[0058] 1. The cross section of the first vertical hollow tube 10 in this embodiment is circular, while the cross section of the first vertical hollow tube 10 in embodiment 1 is rectangular.

[0059] Second, in this embodiment, a motor 90 and an impeller 91 driven by the motor 90 are provided in the first vertical air vent 10. When exhaust is performed in the building exhaust duct, the motor 90 drives the impeller 91 to extract air, which is conducive to faster exhaust of the gas. The blades of the impeller 91 can be retracted / expanded. When the machine is turned on, the blades are extended to extract air, and when the machine is stopped, the blades are retracted. In this way, the effective exhaust area under the stopped state can be increased. Of course, the blades of the impeller 91 can also be fixed, that is, non-retractable.

[0060] 3. In this embodiment, the rain cover plate 20 is circular and tangentially connected to the rain and wind shield plate 30, and the four corner gaps 50 are used for upward exhaust.

[0061] Fourth, in this embodiment, two layers of movable blades 32 are longitudinally arranged at each opening 31. With such a structure, the exhaust effect is better.

[0062] The other structures in this embodiment are the same as those in the first embodiment and will not be described again here.

[0063] Embodiment 4

[0064] Reference Fig.11 , Fig.12 The hood provided in the fourth embodiment of the present application is different from that in the first embodiment in two main aspects:

[0065] 1. In this embodiment, a motor 90 and an impeller 91 driven by the motor 90 are provided in the first vertical air-through pipe 10. When exhaust is performed in the building exhaust duct, the motor 90 drives the impeller 91 to extract air, which is conducive to faster exhaust of the gas.

[0066] Second, a second vertical air-through pipe 13 is arranged around the outer side of the first vertical air-through pipe 10, and a second exhaust channel 14 is formed between the first vertical air-through pipe 10 and the second vertical air-through pipe 13. A check device 15 is arranged at the top of the second exhaust channel 14. Of course, the check device 15 can also be arranged at the bottom of the second exhaust channel 14 or in the second exhaust channel. When it is necessary to increase the exhaust, when the motor 90 drives the impeller 91 to exhaust air, the check device 15 closes the second exhaust channel 14 to prevent the air from flowing back from the second exhaust channel 14. When the motor 90 turns off the impeller 91 to stop exhausting air, the check device 15 opens the second exhaust channel 14, and the gas in the building exhaust duct enters the first vertical air-through pipe 10 and the second exhaust channel 14 for exhaust, thus increasing the effective flow area and making the exhaust more unobstructed. The check device 15 can be controlled to open or close by an electric device, pneumatic and / or gravity or spring force.

[0067] The other structures in this embodiment are the same as those in the first embodiment and will not be described again here.

[0068] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A hood, arranged at the roof outlet of a building exhaust duct, comprising a first vertical air-through pipe, and a rainproof cover plate arranged above the air outlet end at the top of the first vertical air-through pipe, characterized in that: It also includes a windshield device arranged on the side of the rainproof cover plate, an external exhaust channel is formed between the windshield device, the rainproof cover plate and the top air outlet end of the first vertical air-through pipe, and the windshield device includes movable blades. When gas with a certain airflow pressure in the building exhaust duct enters the external exhaust channel, the movable blades are blown outward to increase the exhaust port area of ​​the external exhaust channel; when the gas in the building exhaust duct is less than a certain airflow pressure, the movable blades return to their positions.

2. A hood according to claim 1, characterized in that: The windshield device comprises a rainproof and windshield plate arranged around the outside of the first vertical air-permeable pipe, the rainproof and windshield plate is provided with at least one opening, and the movable blade is arranged outside the opening.

3. A hood according to claim 2, characterized in that: The opening is located in the middle of the rainproof and windshield plate; or, the opening is located at the upper end or the lower end of the rainproof and windshield plate and extends to the upper edge or the lower edge of the rainproof and windshield plate; or, the opening passes through the rainproof and windshield plate horizontally or vertically.

4. The hood according to claim 1, characterized in that: The wind shielding device comprises a bracket arranged along the circumference of the first vertical hollow tube, and the movable blades are multiple, and the multiple movable blades are evenly arranged on the bracket along the circumference of the first vertical hollow tube.

5. A hood according to claim 3 or 4, characterized in that: The movable blades on the same side are arranged in one layer, or are arranged in at least two layers longitudinally.

6. The hood according to claim 1, characterized in that: The movable blade is controlled to increase or decrease its movable angle by an electric control device, and the electric control device controls its opening or closing by at least one of time, pressure, flow, and temperature.

7. The hood according to claim 1, characterized in that: A motor and an impeller driven by the motor are arranged in the first vertical air-permeable pipe, and the impeller blades are fixed or retractable.

8. A hood according to claim 7, characterized in that: A second vertical empty pipe is arranged around the outer side of the first vertical empty pipe, and a second exhaust channel is formed between the first vertical empty pipe and the second vertical empty pipe. A check device is arranged at the top or bottom of the second exhaust channel or inside the second exhaust channel. When the motor drives the impeller to exhaust air, the check device closes the second exhaust channel. When the motor turns off the impeller to stop exhausting air, the check device opens the second exhaust channel.

9. A hood according to claim 8, characterized in that: The non-return device is controlled to be opened or closed by an electric device or pneumatic force and / or gravity or spring force.

10. The hood according to claim 1, characterized in that: The inner bottom surface of the rainproof cover is provided with a sound-absorbing layer; and / or the outer top surface and / or the inner bottom surface of the rainproof cover are provided with protrusions, and / or the rainproof cover is provided with a hole, and a baffle is fixedly or movably arranged on the hole.

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