Anti-crosswind backflow structure and smoke exhaust device

Abstract

The present application relates to a kind of anti-crosswind backflow structure and smoke exhaust device, when along the direction of parallel to wall body side wind attacks, side wind enters flow guide passage, side wind is accelerated in flow guide passage and then enters smoke exhaust tunnel, and, side wind in the smoke exhaust tunnel flows towards the smoke exhaust direction and is discharged from the smoke exhaust tunnel. Since side wind is accelerated in flow guide passage, the flow rate of flue gas is accelerated after side wind enters the smoke exhaust tunnel, so that the emission of flue gas can be promoted. Moreover, the flow direction of side wind in the smoke exhaust tunnel is consistent with the smoke exhaust direction, which not only does not increase the smoke exhaust resistance, but also can generate suction at the communication part of flow guide passage and smoke exhaust tunnel, which can promote the flow of flue gas to this place, more conducive to the smooth emission of flue gas, and improves the smoke exhaust efficiency.

Description

Technical Field

[0001] This invention relates to the field of flue gas emission technology, and in particular to a structure and smoke exhaust device for preventing crosswind backflow. Background Technology

[0002] Wall-mounted boilers, range hoods, and other smoke extraction devices generate fumes during operation, which are typically vented outdoors via exhaust pipes. During strong winds or rain / snow, crosswinds can easily flow back into the room through the exhaust pipes, causing indoor air pollution. Crosswinds refer to winds perpendicular to the exhaust direction. The traditional solution is to install a check valve in the exhaust pipe, which increases exhaust resistance and hinders smooth smoke discharge. Summary of the Invention

[0003] The first technical problem solved by this invention is to provide a structure that prevents backflow of flue gas and ensures smooth discharge of flue gas.

[0004] The second technical problem solved by the present invention is to provide a smoke exhaust device that can prevent backflow of smoke and ensure smooth exhaust of smoke.

[0005] The first technical problem mentioned above is solved by the following technical solution:

[0006] A structure for preventing crosswind backflow includes:

[0007] A connecting pipe, which extends along the exhaust direction and is provided with an exhaust passage cavity for communicating with the exhaust pipe;

[0008] An air guide is provided on the outside of the connecting pipe and is inclined in the opposite direction to the exhaust direction.

[0009] The air guide and the outer wall of the connecting pipe form a flow channel communicating with the smoke exhaust cavity. The flow channel is configured to accelerate the crosswind and allow the crosswind to flow into the smoke exhaust cavity and then flow along the smoke exhaust direction.

[0010] The anti-backdraft structure of this invention offers the following advantages compared to the prior art: When a crosswind parallel to the wall approaches, it enters the guide channel, is accelerated within the channel, and then flows into the smoke exhaust cavity. The crosswind then flows in the direction of smoke exhaust and is discharged from the cavity. Because the crosswind is accelerated within the guide channel, it increases the flow rate of the flue gas upon entering the smoke exhaust cavity, thereby promoting smoke emission. Furthermore, since the flow direction of the crosswind within the smoke exhaust cavity is consistent with the smoke exhaust direction, it not only does not increase smoke exhaust resistance but also generates suction at the connection between the guide channel and the smoke exhaust cavity, promoting the flow of flue gas towards that location and further facilitating smooth smoke emission and improving smoke exhaust efficiency. In addition, when the main unit is not working, the crosswind enters the guide channel, is accelerated, and flows into the smoke exhaust cavity. The accelerated crosswind flows in the smoke exhaust cavity along the smoke exhaust direction, causing the air pressure in the smoke exhaust cavity to drop. This allows indoor air to be drawn into the smoke exhaust cavity through the smoke exhaust pipe and then flow out to the outside with the crosswind, thereby exchanging indoor air and promoting air freshness.

[0011] In one embodiment, the flow channel has a first flow section and a second flow section that are interconnected. The first flow section is used to connect the second flow section and the smoke exhaust cavity. The flow cross-sectional area of ​​the first flow section is smaller than the flow cross-sectional area of ​​the second flow section.

[0012] In one embodiment, the air guide includes a first air guide section and a second air guide section that are connected to each other and arranged at an angle. The first air guide section and the second air guide section are both inclined in the opposite direction to the smoke exhaust direction. The first air guide section and the outer wall of the connecting pipe form the first flow guide section, and the second air guide section and the outer wall of the connecting pipe form the second flow guide section.

[0013] In one embodiment, the angle between the first air guide section and the central axis of the smoke exhaust cavity is smaller than the angle between the second air guide section and the central axis of the smoke exhaust cavity.

[0014] In one embodiment, the connecting pipe has a smoke outlet section and an extension section, the smoke outlet section and the extension section are connected to each other, the smoke outlet section is parallel to and relatively spaced apart from the first air guide section to form the first flow guide section, and the extension section is parallel to and relatively spaced apart from the second air guide section to form the second flow guide section.

[0015] In one embodiment, a support member is provided at the end of the connecting pipe away from the exhaust pipe. The support member extends away from the exhaust pipe along the exhaust direction. There are at least two air guide members, which are arranged along the exhaust direction. Adjacent air guide members are spaced apart to form the flow channel, and at least two air guide members are connected to the support member.

[0016] In one embodiment, the end of the support member away from the connecting pipe is provided with a blocking member, which is used to block crosswinds parallel to the exhaust direction from entering the exhaust cavity.

[0017] In one embodiment, the anti-backflow structure further includes a guide member for guiding the flue gas circumferentially toward the guide fluid. The guide member is connected to the side of the blocking member near the connecting pipe, and the guide member is spaced apart from the connecting pipe.

[0018] In one embodiment, the flow guide is configured as a flow guide cone, which has a large end, a small end, and a flow guide surface located between the large end and the small end. The large end is connected to the blocking member, and the small end is spaced apart from the connecting pipe, so that the flow guide surface can guide the flue gas toward the circumference of the flow guide cone.

[0019] In one embodiment, the guide surface has a windward side and a leeward side along the crosswind direction, and the crosswind pressure on the windward side is higher than the pressure on the leeward side.

[0020] In one embodiment, the connecting pipe has a connecting section for connecting to a smoke exhaust pipe, the outer diameter of which increases along the smoke exhaust direction.

[0021] The second technical problem mentioned above is solved by the following technical solution:

[0022] A smoke exhaust device includes a smoke exhaust pipe and the aforementioned anti-backdraft structure, wherein the smoke exhaust pipe is connected to the connecting pipe.

[0023] The smoke extraction device of this invention offers the following advantages compared to the prior art: When a crosswind traveling parallel to the wall arrives, the crosswind enters the guide channel, is accelerated within the guide channel, and then enters the smoke extraction cavity. Furthermore, the crosswind entering the smoke extraction cavity flows in the direction of smoke extraction and is discharged from the smoke extraction cavity. Because the crosswind is accelerated within the guide channel, it increases the flow rate of the smoke after entering the smoke extraction cavity, thereby promoting smoke emission. Moreover, since the flow direction of the crosswind within the smoke extraction cavity is consistent with the smoke extraction direction, it not only does not increase smoke extraction resistance but also generates suction at the connection point between the guide channel and the smoke extraction cavity, promoting smoke flow towards that location and further facilitating smooth smoke emission, thus improving smoke extraction efficiency. In addition, when the main unit is not working, the crosswind enters the guide channel, is accelerated, and flows into the smoke exhaust cavity. The accelerated crosswind flows in the smoke exhaust cavity along the smoke exhaust direction, causing the air pressure in the smoke exhaust cavity to drop. This allows indoor air to be drawn into the smoke exhaust cavity through the smoke exhaust pipe and then flow out to the outside with the crosswind, thereby exchanging indoor air and promoting air freshness. Attached Figure Description

[0024] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a smoke extraction device according to one embodiment;

[0027] Figure 2 for Figure 1 A schematic diagram of the anti-backdraft structure of the smoke exhaust device;

[0028] Figure 3 for Figure 2 A cross-sectional view of the crosswind backflow prevention structure along the EE direction;

[0029] Figure 4 for Figure 2 A top view of the flow-guiding cone of the anti-backflow structure;

[0030] Figure 5 This is a pressure contour map of crosswinds passing over the guide cone;

[0031] Figure 6 This is a diagram showing the airflow trajectory when crosswinds pass over the guide cone.

[0032] Figure label:

[0033] 100. Anti-backdraft structure; 110. Connecting pipe; 111. Smoke exhaust cavity; 112. Smoke outlet section; 113. Extension section; 114. Connecting section; 120. Air guide; 121. First air guide section; 122. Second air guide section; 130. Flow guide channel; 131. First flow guide section; 132. Second flow guide section; 140. Support component; 150. Blocking component; 160. Flow guide component; 161. Large end; 162. Small end; 163. Flow guide surface; 164. Windward side; 165. Leeward side; 200. Smoke exhaust pipe; 300. Main unit; 400. Wall. Detailed Implementation

[0034] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0040] like Figure 1 As shown, in one embodiment, a smoke exhaust device is provided, including a smoke exhaust pipe 200 and a crosswind backflow prevention structure 100.

[0041] In actual use, one end of the exhaust pipe 200 is connected to the main unit 300, such as the wall-mounted boiler or range hood, while the other end is connected to the anti-backdraft structure 100. The exhaust pipe 200 discharges the fumes generated by the main unit 300 to the outside. Simultaneously, the anti-backdraft structure 100 prevents crosswinds perpendicular to the exhaust direction from entering the exhaust pipe 200, thus avoiding backdraft of fumes.

[0042] It is important to understand that when flue gas flows within the exhaust pipe 200, the flue gas flows along the extension direction of the central axis of the exhaust pipe 200, that is, the direction in which the flue gas flows from the main unit 300 to the outside is the exhaust direction (e.g., Figure 1 shown in direction A).

[0043] like Figure 1 As shown, for the purpose of explaining the principle of the embodiments of this application, the example is taken where the exhaust pipe 200 extends perpendicularly to the wall 400 to the outside. This should not be construed as a limitation on the embodiments of this application. In this case, the crosswind direction is the direction parallel to the wall 400, and the exhaust direction is the direction perpendicular to the wall 400. It should be emphasized that in other embodiments, the exhaust pipe 200 may also extend parallel to the wall 400 to the outside or be set at other angles with the wall 400, and can be flexibly designed or arranged according to the actual installation site conditions.

[0044] like Figure 2 As shown, in one embodiment, a crosswind backflow prevention structure 100 is provided, including a connecting pipe 110 and an air guide 120.

[0045] The connecting pipe 110 can be made of a material that can withstand the corrosion and heating of flue gas.

[0046] Specifically, the connecting pipe 110 extends along the smoke exhaust direction, and the connecting pipe 110 is provided with a smoke exhaust cavity 111. After connecting the connecting pipe 110 and the smoke exhaust pipe 200, the smoke exhaust cavity 111 is connected to the smoke exhaust pipe 200, and the smoke exhaust from the smoke exhaust pipe 200 can enter the smoke exhaust cavity 111 and be discharged to the outside.

[0047] The connection between the connecting pipe 110 and the exhaust pipe 200 can be achieved by sleeve connection or by screw connection.

[0048] like Figure 3 As shown, optionally, the connecting pipe 110 has a connecting section 114, which is connected to the smoke exhaust pipe 200 by means of a sleeve or screw connection, thereby enabling the smoke exhaust cavity 111 to communicate with the smoke exhaust pipe 200.

[0049] like Figure 3 As shown, further, the outer diameter of the connecting section 114 (e.g.) Figure 3 As shown in D1) along the smoke exhaust direction (e.g. Figure 1 and Figure 3 The connection section 114 increases in the direction of A, thereby enabling it to accommodate the installation needs of exhaust pipes 200 with different diameters. Specifically, simply inserting the connection section 114 into the exhaust pipe 200, such that the outer wall of the connection section 114 fits against the inner wall of the exhaust pipe 200, allows for the assembly and connection of the connection pipe 110 with exhaust pipes 200 of different diameters.

[0050] The air guide 120 is installed on the outside of the connecting pipe 110 by means of sleeve installation or other methods. Furthermore, the air guide 120 faces the opposite direction to the smoke exhaust direction (e.g., ...). Figure 2 (As shown in direction D) It is inclined, that is, the air guide 120 extends inclinedly from the outside of the connecting pipe 110 in the opposite direction of the smoke exhaust direction.

[0051] Optionally, the air guide 120 can be in the form of an air guide shroud, an air guide blade, or an air guide housing. The air guide 120 can be made of heat-resistant and corrosion-resistant materials such as plastic.

[0052] like Figure 2 As shown, specifically, after the air guide 120 is installed on the outside of the connecting pipe 110, the air guide 120 can form a guide channel 130 with the outer wall of the connecting pipe 110, which communicates with the smoke exhaust cavity 111.

[0053] Meanwhile, the guide channel 130 is configured to accelerate crosswinds and allow them to flow into the smoke exhaust cavity 111 and then along the smoke exhaust direction. Thus, when a crosswind parallel to the wall 400 arrives, it enters the guide channel 130, is accelerated within it, and then flows into the smoke exhaust cavity 111. The crosswind then flows in the smoke exhaust direction and exits from the smoke exhaust cavity 111. Because the crosswind is accelerated within the guide channel 130, it increases the flow rate of the flue gas upon entering the smoke exhaust cavity 111, thereby promoting flue gas emission. Furthermore, since the flow direction of the crosswind within the smoke exhaust cavity 111 is consistent with the smoke exhaust direction, it not only does not increase smoke exhaust resistance but also generates suction at the connection point between the guide channel 130 and the smoke exhaust cavity 111, promoting flue gas flow towards that location and further facilitating smooth flue gas emission, thus improving smoke exhaust efficiency. In addition, when the main unit 300 is not working, the crosswind enters the guide channel 130 and is accelerated and flows into the smoke exhaust cavity 111. The accelerated crosswind flows in the smoke exhaust cavity 111 along the smoke exhaust direction, causing the air pressure in the smoke exhaust cavity 111 to drop. As a result, the indoor air is drawn into the smoke exhaust cavity 111 through the smoke exhaust pipe 200 and flows out to the outside with the crosswind, thereby exchanging the indoor air and helping to freshen the air.

[0054] like Figure 3 As shown, more specifically, the flow channel 130 has a first flow section 131 and a second flow section 132 that are interconnected. The first flow section 131 is used to connect the second flow section 132 and the smoke exhaust cavity 111. That is, the first flow section 131 is located between the smoke exhaust cavity 111 and the second flow section 132. The crosswind from the outside first enters the second flow section 132, then enters the first flow section 131, and finally flows into the smoke exhaust cavity 111.

[0055] Furthermore, the cross-sectional area of ​​the first guide section 131 is smaller than that of the second guide section 132. Thus, when crosswind flows from the second guide section 132 into the first guide section 131, the smaller cross-sectional area results in a faster crosswind velocity, thereby accelerating the crosswind.

[0056] The first guide section 131 and the second guide section 132 can both be set in a funnel shape, so that the crosswind begins to accelerate when it enters the second guide section 132, and is further accelerated when it enters the first guide section 131, so that the crosswind enters the smoke exhaust cavity 111 at a greater velocity, which can more effectively promote the emission of flue gas.

[0057] like Figure 3 As shown, the air guide 120 further includes a first air guide section 121 and a second air guide section 122 that are connected to each other and arranged at an angle.

[0058] Both the first guide section 121 and the second guide section 122 are inclined in the opposite direction to the smoke exhaust direction, meaning that both the first guide section 121 and the second guide section 122 extend in the opposite direction to the smoke exhaust direction relative to the connecting pipe 110. Furthermore, the first guide section 121 and the outer wall of the connecting pipe 110 form the first guide section 131, and the second guide section 122 and the outer wall of the connecting pipe 110 form the second guide section 132. Thus, when crosswinds occur, the airflow enters the second guide section 132 under the guidance of the second guide section 122, and then enters the first guide section 131 under the guidance of the first guide section 121, ultimately entering the smoke exhaust cavity 111.

[0059] In addition, the angled arrangement between the first guide section 121 and the second guide section 122 also accelerates the crosswind as it flows within the guide channel 130.

[0060] Specifically, the angle between the central axis of the first guide section 121 and the smoke exhaust cavity 111 (e.g.) Figure 3 (As shown by angle α) is less than the angle between the central axis of the second guide section 122 and the smoke exhaust cavity 111 (as shown by angle α). Figure 3 (As shown by the β angle). In this way, the flow cross-sectional area of ​​the first guide section 131 is smaller than that of the second guide section 132, so that the crosswind can be accelerated when it flows from the second guide section 132 into the first guide section 131, ensuring that the crosswind can flow into the smoke exhaust cavity 111 at a higher flow rate, which can promote the emission of flue gas.

[0061] It should be noted that the angle between the first air guide section 121 and the second air guide section 122 can be flexibly adjusted or designed according to actual usage needs, as long as the flow cross-sectional area of ​​the first air guide section 131 is smaller than the flow cross-sectional area of ​​the second air guide section 132.

[0062] like Figure 3 As shown, the connecting pipe 110 also has a smoke outlet section 112 and an extension section 113.

[0063] Specifically, the smoke outlet section 112 and the extension section 113 are interconnected. Preferably, the smoke outlet section 112 and the extension section 113 are integrally formed with the entire connecting pipe 110.

[0064] like Figure 3As shown, the smoke outlet section 112 and the first air guide section 121 are arranged parallel to each other and spaced apart to form the first guide section 131, and the extension section 113 and the second air guide section 122 are arranged parallel to each other and spaced apart to form the second guide section 132. Thus, when a crosswind occurs, the crosswind enters the second guide section 132 under the combined guiding effect of the extension section 113 and the second air guide section 122, and then enters the first guide section 131 under the combined guiding effect of the smoke outlet section 112 and the first air guide section 121, ultimately entering the smoke exhaust cavity 111.

[0065] More specifically, the smoke outlet section 112 can extend toward the smoke exhaust cavity 111, while the outer extension section 113 can extend toward a direction away from the smoke exhaust cavity 111.

[0066] In addition, to ensure that the air guide 120 can be assembled and connected with the connecting pipe 110, such as... Figure 2 and Figure 3 As shown, optionally, a support member 140 is provided at the end of the connecting pipe 110 away from the exhaust pipe 200. Furthermore, the support member 140 extends in the direction away from the exhaust pipe 200 along the exhaust direction, so that the air guide member 120 and the support member 140 can be connected by means of screwing, snap-fitting, etc., so that the air guide member 120 and the outer wall of the connecting pipe 110 can form a guide channel 130.

[0067] The support member 140 can be in the form of a support bar or a support frame. In some embodiments, the support member 140 can be integrally formed with the connecting pipe 110. In other embodiments, the support member 140 and the connecting pipe 110 can be separately formed and then assembled and connected by means of screwing or snap-fitting.

[0068] Specifically Figure 1 From this perspective, when the smoke exhaust direction is from left to right and the smoke exhaust pipe 200 is located on the left side, the air guide 120 is inclined from right to left relative to the connecting pipe 110, that is, both the first air guide section 121 and the second air guide section 122 are inclined from right to left relative to the connecting pipe 110. Furthermore, the support member 140 extends from left to right.

[0069] Furthermore, in order to guide more crosswinds into the smoke exhaust cavity 111 to promote the flow of flue gas, the number of air guides 120 can be flexibly adjusted or designed according to actual usage requirements.

[0070] Optionally, there are at least two air guides 120, which are arranged along the smoke exhaust direction. Furthermore, two adjacent air guides 120 are spaced apart to form a guide channel 130, thus providing at least two guide channels 130 in the smoke exhaust direction. This allows more crosswinds to be guided into the guide channels 130 and ultimately enter the smoke exhaust cavity 111, flowing towards the smoke exhaust direction, thereby better promoting the emission of flue gas.

[0071] Specifically, the air guide 120 can be two, three, four or more, and can be flexibly adjusted or designed according to actual usage requirements.

[0072] In practical use, there is not only the risk of crosswind backflow, but also the risk of crosswind backflow. Crosswind refers to wind parallel to the direction of smoke exhaust, such as... Figure 1 The wind coming from direction C is a crosswind.

[0073] like Figure 2 and Figure 3 As shown, in order to avoid crosswind backflow, in one embodiment, the end of the support member 140 away from the connecting pipe 110 is provided with a blocking member 150, thereby using the blocking member 150 to block the crosswind and prevent the crosswind from entering the smoke exhaust cavity 111 and eventually entering the smoke exhaust pipe 200, which would cause backflow of flue gas.

[0074] The blocking component 150 can be in the form of a blocking cover or a blocking plate, as long as it can block crosswinds to prevent them from entering the smoke exhaust cavity 111.

[0075] Specifically, in the embodiments of this application, the blocking member 150 is set as a blocking plate. The blocking plate is connected to the support member 140 by means of screwing, plugging or other methods. The blocking plate and the connecting pipe 110 are spaced apart, so as not to affect the normal discharge of smoke in the smoke exhaust cavity 111, and also to prevent crosswinds from entering the smoke exhaust cavity 111.

[0076] Understandably, the distance between the blocking component 150 and the connecting pipe 110 can be flexibly designed or adjusted according to the actual use, as long as it does not affect the normal discharge of smoke in the smoke exhaust cavity 111 and can also prevent crosswinds from entering the smoke exhaust cavity 111.

[0077] In addition, to prevent the obstruction component 150 from affecting the smooth discharge of flue gas, such as... Figure 2 and Figure 3As shown, optionally, the anti-backdraft structure 100 also includes a guide member 160. Specifically, the guide member 160 is connected to the side of the blocking member 150 near the connecting pipe 110, that is, the guide member 160 is fixed on the blocking member 150. Furthermore, the guide member 160 and the connecting pipe 110 are spaced apart, so that the smoke and crosswind flowing out of the smoke exhaust cavity 111 can be smoothly discharged to the outside. Moreover, when the smoke and crosswind flowing out of the smoke exhaust cavity 111 passes through the guide member 160, the guide member 160 guides the smoke and crosswind to the circumference of the guide member 160 and discharges them to the outside, which can reduce the smoke exhaust resistance and allow the smoke to be discharged smoothly.

[0078] In one embodiment, the flow guide 160 is configured as a flow guide cone.

[0079] like Figure 3 As shown, the guiding vertebra has a large end 161, a small end 162, and a guiding surface 163 located between the large end 161 and the small end 162, that is, the guiding surface 163 is the circumferential sidewall of the guiding vertebra.

[0080] It is understandable that the large end 161 of the diversion vertebra refers to the end with a relatively larger diameter, and the small end 162 refers to the end with a relatively smaller diameter.

[0081] Among them, the guide surface 163 can be a guide arc surface or a guide slope surface.

[0082] Specifically, the large end 161 is connected to the blocking member 150 by means of bonding, screwing, etc., and the small end 162 is spaced apart from the connecting pipe 110. This allows the guide surface 163 located between the small end 162 and the large end 161 to guide the flue gas around the guide cone, which facilitates the flow of flue gas and crosswinds towards the outside. This not only promotes the flow of flue gas and crosswinds, but also effectively reduces the noise of exhaust.

[0083] Of course, in other embodiments, the guide cone can also be integrally formed with the blocking member 150.

[0084] In addition, the large end 161 can be connected to the blocking member 150 by a rounded transition, so that the smoke and crosswind can flow more smoothly at the connection between the large end 161 and the blocking member 150, which can effectively reduce the smoke exhaust resistance and smoke exhaust noise.

[0085] Furthermore, the projection of the small end 162 onto the blocking member 150 is a dot, thus making the overall guide cone cylindrical and the guide surface 163 a guide arc surface, which has the best guiding effect on smoke and crosswind, and can more effectively reduce smoke exhaust resistance and smoke exhaust noise. Of course, in other embodiments, the projection of the small end 162 onto the blocking member 150 can also be a circle or other shapes.

[0086] like Figure 4As shown, further, along the crosswind direction (such as...) Figure 4 (As shown in direction B), the guide surface 163 has a windward side 164 and a leeward side 165.

[0087] Specifically, along the direction of crosswind flow, the side facing the crosswind is the windward side 164, and the side away from the crosswind is the leeward side 165.

[0088] Specifically Figure 1 From the perspective of the wall 400, when the crosswind flows from bottom to top, the lower side of the guide surface 163 is the windward side 164, and the upper side of the guide surface 163 is the leeward side 165; when the crosswind flows from top to bottom, the upper side of the guide surface 163 is the windward side 164, and the lower side of the guide surface 163 is the leeward side 165.

[0089] like Figure 5 and Figure 6 As shown, the air pressure on the windward side 164 is higher than that on the leeward side 165. For example, the air pressure when the crosswind flows to and near the windward side 164 is H1, and the air pressure when the crosswind flows to and near the leeward side 165 is H2, where H1 is greater than H2. With this configuration, when the crosswind flows to contact the guide surface 163, the pressure difference between the windward side 164 and the leeward side 165 causes the surrounding air to flow towards the area of ​​lower pressure, i.e., towards the leeward side 165. This promotes smoke flow, facilitates smoke extraction, and improves smoke extraction efficiency. Furthermore, when the main unit 300 is not operating, the air in the smoke extraction cavity 111 flows towards the leeward side 165, causing indoor air to continuously flow towards the leeward side 165 after passing through the smoke extraction pipe 200 and then through the smoke extraction cavity 111, thereby exchanging indoor air and promoting air freshness.

[0090] At the same time, the central axis of the guide 160 can be set to coincide with the central axis of the connecting pipe 110, so that the smoke and side air discharged from the smoke passage can flow accurately to the guide 160, and the guide 160 can better guide the smoke and side air discharged from the smoke passage 111, resulting in good smoke exhaust effect.

[0091] Additionally, the inner diameter of the smoke outlet section 112 can be adjusted (e.g., Figure 3 As shown in D2, the exhaust section 112 is set to decrease along the exhaust direction, so that the exhaust section 112 is funnel-shaped, which makes the smoke and crosswind gradually converge toward the middle area during the exhaust process, so that the smoke and crosswind can flow better to the guide member 160, improving the guiding effect of the guide member 160 and improving the exhaust efficiency.

[0092] Furthermore, the central axis of the smoke exhaust section 112 coincides with the central axis of the guide member 160, which further enables the smoke and crosswind to flow better onto the guide member 160, thereby further improving the guiding effect of the guide member 160 and further improving the smoke exhaust efficiency.

[0093] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0094] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A structure for preventing crosswind backflow, characterized in that, include: A connecting pipe (110) extends along the smoke exhaust direction and is provided with a smoke exhaust passage (111) for communicating with the smoke exhaust pipe (200). An air guide (120) is provided on the outside of the connecting pipe (110), and the air guide (120) is inclined in the opposite direction to the smoke exhaust direction; The outer walls of the air guide (120) and the connecting pipe (110) are arranged to form a flow channel (130) that communicates with the smoke exhaust cavity (111). The flow channel (130) is configured to accelerate the crosswind and allow the crosswind to flow into the smoke exhaust cavity (111) and then flow along the smoke exhaust direction. A support member (140) is provided at one end of the connecting pipe (110) away from the exhaust pipe (200). The support member (140) extends along the exhaust direction away from the exhaust pipe (200). A blocking member (150) is provided at one end of the support member (140) away from the connecting pipe (110). The blocking member (150) is used to block crosswinds parallel to the exhaust direction from entering the exhaust cavity (111). The anti-backflow structure also includes a guide member (160). The guide member (160) is used to guide the flue gas in its circumferential direction. The guide member (160) is connected to the blocking member (150) on the side near the connecting pipe (110). The guide element (160) is spaced apart from the connecting pipe (110); the guide element (160) is configured as a guide cone, the guide cone having a large end (161), a small end (162) and a guide surface (163) located between the large end (161) and the small end (162), the large end (161) is connected to the blocking element (150), and the small end (162) is spaced apart from the connecting pipe (110), so that the guide surface (163) can guide the flue gas toward the circumference of the guide cone; along the crosswind direction, the guide surface (163) has a windward side (164) and a leeward side (165), and the crosswind pressure on the windward side (164) is higher than the pressure on the leeward side (165).

2. The anti-backdraft structure according to claim 1, characterized in that, The flow channel (130) has a first flow section (131) and a second flow section (132) that are interconnected. The first flow section (131) is used to connect the second flow section (132) and the smoke exhaust cavity (111). The flow cross-sectional area of ​​the first flow section (131) is smaller than the flow cross-sectional area of ​​the second flow section (132).

3. The anti-backdraft structure according to claim 2, characterized in that, The air guide (120) includes a first air guide section (121) and a second air guide section (122) that are connected to each other and arranged at an angle. The first air guide section (121) and the second air guide section (122) are both inclined in the opposite direction to the exhaust direction. The first air guide section (121) and the outer wall of the connecting pipe (110) form the first flow guide section (131), and the second air guide section (122) and the outer wall of the connecting pipe (110) form the second flow guide section (132).

4. The anti-backdraft structure according to claim 3, characterized in that, The angle between the first air guide section (121) and the central axis of the smoke exhaust cavity (111) is smaller than the angle between the second air guide section (122) and the central axis of the smoke exhaust cavity (111).

5. The anti-backdraft structure according to claim 3, characterized in that, The connecting pipe (110) has a smoke outlet section (112) and an extension section (113). The smoke outlet section (112) and the extension section (113) are connected to each other. The smoke outlet section (112) is parallel to the first air guide section (121) and is arranged at intervals to form the first flow guide section (131). The extension section (113) is parallel to the second air guide section (122) and is arranged at intervals to form the second flow guide section (132).

6. The anti-backdraft structure according to any one of claims 1 to 5, characterized in that, There are at least two air guides (120), and at least two air guides (120) are arranged along the smoke exhaust direction. Two adjacent air guides (120) are spaced apart to form the flow channel (130), and at least two air guides (120) are connected to the support (140).

7. The anti-backdraft structure according to claim 1, characterized in that, The support member (140) and the connecting pipe (110) are integrally formed.

8. The anti-backdraft structure according to any one of claims 1 to 5, characterized in that, The connecting pipe (110) has a connecting section (114) for connecting to the exhaust pipe (200), the outer diameter of the connecting section (114) increasing along the exhaust direction.

9. The anti-backdraft structure according to claim 8, characterized in that, The connecting section (114) is inserted into the exhaust pipe (200) such that the outer wall of the connecting section (114) fits against the inner wall of the exhaust pipe (200).

10. A smoke extraction device, characterized in that, It includes a smoke exhaust pipe (200) and a backflow prevention structure (100) as described in any one of claims 1 to 9, wherein the smoke exhaust pipe (200) is connected to the connecting pipe (110).

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