Wind cap capable of preventing wind from flowing backwards

Abstract

The invention belongs to the technical field of exhaust passage systems, and provides a wind cap capable of preventing wind from flowing backwards, which is arranged at an air outlet of an exhaust passage and comprises a base with an air inlet, a rain shielding cover plate arranged above the air inlet, a wind shielding device arranged beside the rain shielding cover plate, and a fixing device for connecting the base, the rain shielding cover plate and the wind shielding device, an air outlet channel communicated with the air inlet is arranged between the rain shielding cover plate and the wind shielding device, an obliquely-arranged flow changing plate is arranged above the rain shielding cover plate, and the included angle between the side, facing the air outlet channel, of the flow changing plate and the rain shielding cover plate is a, 0 degree lt; a < lt >; and 90 degrees. According to the device, the flow changing plate is arranged above the rain shielding cover plate, and the included angle between the side, facing the air outlet channel, of the flow changing plate and the rain shielding cover plate is a, 0 degree lt; a < lt >; under the action of the variable flow plate, the flowing direction of natural wind is changed, the situation that waste gas is blocked from being discharged due to the fact that the natural wind flows backwards into the hood is avoided, and exhaust resistance is greatly reduced.

Description

Technical Field

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

[0002] The hood used for the roof of the building exhaust system is used to prevent natural wind, rain and snow from flowing back into the exhaust duct, and facilitate the exhaust of exhaust gas in the exhaust duct. However, the existing hood structure does not solve the problem of natural wind backflow and large exhaust resistance.

[0003] For example, Figure 1 , Figure 2 As shown, the arrow line indicates the direction of natural wind flow. When the existing wind hood is used, the natural wind flows back from the air outlet into the wind hood to block the discharge of gas. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a hood to prevent wind backflow, aiming to solve the technical problems of wind backflow and large exhaust resistance in the hood in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the embodiment of the present application is: a wind backflow prevention hood is arranged at the air outlet of the exhaust duct, comprising a base with an air inlet, a rain shield cover plate arranged above the air inlet, a wind shield device arranged beside the rain shield cover plate, and a fixing device connecting the base, the rain shield cover plate and the wind shield device, an air outlet channel connected to the air inlet is arranged between the rain shield cover plate and the wind shield device, an inclined deflector plate is arranged above the rain shield cover plate, and the angle between the deflector plate facing the air outlet channel and the rain shield cover plate is a, 0° <a<90°。

[0006] Specifically, the deflector plate is a flat plate or a curved plate or an irregularly shaped plate.

[0007] Specifically, the rain shield cover is a flat plate or a curved plate or an irregularly shaped plate.

[0008] Specifically, there are a plurality of the current transformer plates, and the plurality of the current transformer plates are arranged at intervals.

[0009] Specifically, the converter plates include a plurality of first converter plates and a plurality of second converter plates, and the plurality of first converter plates and the plurality of second converter plates are staggered.

[0010] Specifically, a drainage hole is provided between the deflector plate and the rain shield cover.

[0011] Specifically, the deflector plate is fixed on the rain shield cover, or fixed on the wind shield device, or fixed on the fixing device.

[0012] Specifically, the windshield device is provided with a through hole communicating the air outlet passage with the outside, and a normally closed check plate is hinged at the through hole.

[0013] In this application, a flow deflector is arranged above the rain shield. The included angle between the side of the flow deflector facing the air outlet passage and the rain shield is α, where 0° < α < 90°. Through the action of the flow deflector, the natural wind changes the flow direction, avoiding backflow into the wind cap and blocking the exhaust of waste gas, and greatly reducing the exhaust resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 Schematic cross-section of the wind cap in the prior art Figure 1 ;

[0016] Figure 2 Schematic cross-section of another wind cap in the prior art Figure 2 ;

[0017] Figure 3 Schematic plan view of the wind cap provided in Embodiment 1 of the present application;

[0018] Figure 4 For Figure 3 the cross-sectional schematic diagram;

[0019] Figure 5 Schematic plan view of the wind cap provided in Embodiment 2 of the present application;

[0020] Figure 6 For Figure 5 the cross-sectional schematic diagram;

[0021] Figure 7 Schematic plan view of the rain shield provided in Embodiment 3 of the present application.

[0022] Among them, the reference numerals in the drawings are as follows:

[0023] 10 - Base; 11 - Air inlet; 12 - Rain shield; 13 - Windshield device; 14 - Fixing device; 15 - Air outlet passage; 16 - Flow deflector; 161 - First flow deflector; 162 - Second flow deflector; 18 - Seat body; 19 - Fixing part. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] Embodiment 1

[0029] See also Figure 3 , Figure 4 , a wind backflow prevention hood provided in the first embodiment of the present application is arranged at the air outlet of the exhaust duct (not shown in the figure), and is used to allow the exhaust gas in the exhaust duct to be discharged smoothly from the air outlet, while preventing external gas or rain and snow from entering the exhaust duct and causing backflow. The wind backflow prevention hood includes a base 10 with an air inlet 11, a rain shield cover 12 arranged above the air inlet 11, a wind shield device 13 arranged beside the rain shield cover 12, and a fixing device 14 connecting the base 10, the rain shield cover 12 and the wind shield device 13, and an air outlet channel 15 connected to the air inlet 11 is provided between the rain shield cover 12 and the wind shield device 13. An inclined deflector plate 16 is provided above the rain shield cover 12, and the angle between the deflector plate 16 and the rain shield cover 12 on the side facing the air outlet channel 15 is a, 0° <a<90°。

[0030] Depend on Figure 4It can be seen that in the present application, a flow deflector 16 is provided above the rain shield 12. The angle between the side of the flow deflector 16 facing the air outlet channel 15 and the rain shield 12 is α, where 0° < α < 90°. Due to the effect of the flow deflector 16, the natural wind changes its flow direction, preventing backflow into the wind cap and blocking the exhaust of waste gas, thus greatly reducing the exhaust resistance.

[0031] In this embodiment, the flow deflector 16 is a flat plate, and the rain shield 12 is also a flat plate. In this way, the forming process is simple and the cost is low. Of course, the flow deflector 16 can also be a curved plate or an irregularly shaped plate, and the rain shield 12 can also be a curved plate or an irregularly shaped plate.

[0032] In this embodiment, the flow deflector 16 is directly fixed to the rain shield 12. The flow deflector 16 can also be fixed to the wind blocking device 13 or the fixing device 14, as long as the flow deflector 16 is located above the rain shield 12 and the angle α between the side of the flow deflector 16 facing the air outlet channel 15 and the rain shield 12 satisfies 0° < α < 90°.

[0033] In this embodiment, the rain shield 12 is a rectangular plate, and there are four flow deflectors 16, which are respectively arranged at the four side edges of the rectangular plate, and the adjacent flow deflectors 16 are arranged at intervals. In this way, the rain received by the rain shield 12 flows out from the intervals between the adjacent flow deflectors 16.

[0034] In other embodiments, through holes (not shown in the figure) communicating with the air inlet 11 can also be provided on the wind blocking device 13, and normally closed check plates (not shown in the figure) are hinged at the through holes. In this way, the airflow discharged from the exhaust duct blows open the normally closed check plates, increasing the side air outlet area and being more beneficial to the exhaust of waste gas.

[0035] In this embodiment, the base 10 includes a hollow seat body 18 and a fixing portion 19 extending outward along the edge of the seat body 18. The air inlet 11 is provided on the base 10, and screw holes (not marked in the figure) are provided on the fixing portion 19 for fixing the fixing portion 19 to the supporting surface through bolts.

[0036] Embodiment Two

[0037] Refer to Figure 5 、 Figure 6 A wind cap for preventing wind backflow provided in this Embodiment Two is different from Embodiment One in that:

[0038] 1. The whole wind cap for preventing wind backflow is cylindrical, the rain shield 12 is a circular plate, and the flow deflector 16 is a circular curved plate, that is, the inner surface of the flow deflector 16 is a curved surface.

[0039] 2. In this embodiment, the flow deflectors 16 are connected as a whole, there are no gaps in the circular flow deflectors 16, and drainage holes (not shown in the figure) are provided between the flow deflectors 16 and the rain shield 12 to facilitate the discharge of the rain received by the rain shield 12.

[0040] The other aspects of this embodiment that are the same as those of the first embodiment are not described in detail.

[0041] Embodiment 3

[0042] Reference Figure 7 , this embodiment three provides a wind backflow prevention hood, and other structures are different from those of embodiment one and are not shown in the figure. The rain shield cover 12 shown in embodiment three is a rectangular structure. The deflector plate 16 includes four first deflector plates 161 and four second deflector plates 162. The structure of the first deflector plate 161 is different from that of the second deflector plate 162. The first deflector plate 161 is flat and is arranged at the edge of the rain shield cover 12, while the second deflector plate 162 has a U-shaped cross-section and is located at the four corners of the rain shield cover 12. The four first deflector plates 161 and the four second deflector plates 162 are staggered, so that rainwater is discharged from the staggered position. The arrow line in the figure indicates the direction of rainwater discharge.

[0043] The above is only a specific implementation 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 covered by the protection scope of the present application.

Claims

1. A wind backflow prevention cap, arranged at the air outlet of an exhaust duct, comprising a base with an air inlet, a rain shield plate arranged above the air inlet, a wind shield device arranged beside the rain shield plate, and a fixing device connecting the base, the rain shield plate and the wind shield device, an air outlet channel connected to the air inlet is arranged between the rain shield plate and the wind shield device, characterized in that: The rain shield cover is provided with an inclined deflector plate, and the angle between the deflector plate facing the air outlet passage and the rain shield cover is a, 0° <a<90°。 2. The wind-proof backflow hood according to claim 1, characterized in that: The deflector plate is a flat plate, a curved plate or an irregularly shaped plate.

3. The windproof backflow hood according to claim 1, characterized in that: The rain shield cover is a flat plate, a curved plate or an irregularly shaped plate.

4. The windproof backflow hood according to claim 1, characterized in that: There are multiple converter plates, and the multiple converter plates are arranged at intervals.

5. The wind-proof backflow hood according to claim 1, characterized in that: The converter plates include a plurality of first converter plates and a plurality of second converter plates, and the plurality of first converter plates and the plurality of second converter plates are staggered.

6. The wind-proof backflow hood according to claim 1, characterized in that: A drainage hole is provided between the deflector plate and the rain shield cover plate.

7. The windproof backflow hood according to claim 1, characterized in that: The deflector plate is fixed on the rain shield cover, or fixed on the wind shield device, or fixed on the fixing device.

8. The wind-proof backflow hood according to claim 1, characterized in that: The wind shielding device is provided with a through hole connecting the air outlet channel with the outside, and a normally closed check plate is hinged at the through hole.

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