Air outlet pipe and range hood

Abstract

The utility model provides an air outlet pipe and a range hood, and relates to the technical field of kitchen utensils. The air outlet pipe comprises a flow guide pipe, the flow guide pipe is provided with a first connecting part and a second connecting part, the first connecting part serves as the inlet end of the flow guide pipe, the second connecting part serves as the outlet end of the flow guide pipe, and an included angle is formed between the axis of the first connecting part and the axis of the second connecting part; a flow guide assembly is arranged in the flow guide pipe and comprises a first flow guide piece and a second flow guide piece, and the first flow guide piece and the second flow guide piece are perpendicular to each other. According to the air outlet pipe, the technical problems that in the prior art, a smoke exhaust pipe is large in noise, and use is affected are solved, and the technical effects that stable smoke exhaust is provided, and the noise level is low are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to an air outlet pipe and a range hood. Background Art

[0002] With the introduction of new regulations for range hood performance, market requirements for range hood noise control have expanded from laboratory testing to actual user scenarios. The new national standard not only requires range hoods to meet standard sound power levels in a semi-anechoic chamber, but also emphasizes the product's noise performance in a home environment to meet user demands for a quiet kitchen experience.

[0003] Currently, the main source of noise issues with range hoods in home use is the exhaust duct. Specifically, the exhaust duct plays a key role in the exhaust system, and its design and material selection directly impact the overall system noise level. As range hood air volume increases, the noise issue from the exhaust duct becomes more pronounced. Especially in homes, exhaust ducts often require multiple 90° bends. These bends not only increase airflow resistance, resulting in reduced exhaust efficiency, but also create airflow disturbances and turbulence, further amplifying flow noise.

[0004] Furthermore, the generation of turbulence and vortices can cause secondary vibrations in the duct. This vibration noise is particularly prominent in a home environment, seriously affecting the user experience. Therefore, how to effectively reduce drag and noise in the exhaust duct bend has become a key technical point in improving the overall performance of range hoods. Utility Model Content

[0005] The purpose of the utility model is to provide an air outlet pipe and a range hood, so as to alleviate the technical problem in the prior art that the exhaust pipe makes a lot of noise and affects the use.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0007] In a first aspect, the utility model provides an air outlet duct, comprising a guide pipe, the guide pipe having a first connection portion and a second connection portion, the first connection portion being an inlet end of the guide pipe, the second connection portion being an outlet end of the guide pipe, and an axis of the first connection portion and an axis of the second connection portion forming an angle;

[0008] A flow guide assembly is provided in the flow guide pipe. The flow guide assembly includes a first flow guide plate and a second flow guide plate. The first flow guide plate and the second flow guide plate are arranged perpendicular to each other.

[0009] Furthermore, the first guide plate is arranged along the radial direction of the first connecting part, and the first guide plate passes through the center of the first connecting part in the horizontal direction; the second guide plate is arranged along the extension direction of the guide tube, and the end of the second guide plate passes through the center of the first connecting part in the vertical direction.

[0010] Furthermore, the air outlet pipe further comprises a valve plate fixing seat, in which a check valve plate is provided, and the check valve plate is rotatably mounted in the valve plate fixing seat;

[0011] The valve plate fixing seat and the guide tube have two installation states:

[0012] When in the first installation state, the first connecting portion of the flow guide pipe is connected to the valve plate fixing seat;

[0013] When in the second installation state, the valve plate fixing seat is connected to the second connecting portion of the flow guide pipe.

[0014] Furthermore, when the first connecting portion of the flow guide pipe is connected to the valve disc fixing seat, the distance between the end of the first connecting portion and the flow guide assembly is greater than the rotation radius of the check valve disc.

[0015] Furthermore, the air outlet pipe further comprises a bellows having an air inlet end and an air outlet end;

[0016] In the first installation state, the air inlet end of the bellows is connected to the second connecting portion;

[0017] In the second installation state, the air inlet end of the bellows is connected to the air outlet end of the valve plate fixing seat.

[0018] Furthermore, the inner wall of the valve plate fixing seat is protruded inwardly and provided with a limiting device, and the limiting device is arranged at the front end of the check valve plate along the direction of smoke flow.

[0019] Furthermore, the air outlet pipe further includes an adapter having an air inlet end and an air outlet end;

[0020] In the first installation state, the air inlet end of the adapter is connected to the valve plate fixing seat, and the air outlet end of the adapter is connected to the first connecting portion;

[0021] In the second installation state, the air inlet end of the adapter is connected to the second connecting portion, and the air outlet end of the adapter is connected to the valve plate fixing seat.

[0022] Furthermore, the air outlet pipe further includes a check valve base;

[0023] In the first installation state, the valve plate fixing seat is arranged in the check valve base, the air inlet end of the adapter is connected to the air outlet end of the check valve base, the adapter is provided with four first connection positioning grooves evenly distributed on the air outlet end of the adapter, and the first connection portion has four connecting members adapted to the first connection positioning grooves;

[0024] In the second installation state, the check valve base is provided with four second connection positioning grooves evenly distributed at the air outlet end of the check valve base, the first connection part has four connecting parts adapted to the first connection positioning grooves, the check valve base is arranged in the adapter, and the adapter is connected to the second connection part of the guide pipe.

[0025] Furthermore, the guide pipe includes a curved pipe portion, one end of the curved pipe portion is connected to the first connecting portion, the other end of the curved pipe portion is connected to the second connecting portion, and the angle between the axes of the first connecting portion and the second connecting portion is 90°.

[0026] In a second aspect, the utility model provides a range hood, comprising a range hood and an air outlet pipe as described above, wherein the air outlet pipe is installed on the top of the range hood.

[0027] Based on the above technical solutions, the technical effects that can be achieved by this utility model are analyzed as follows:

[0028] The air outlet duct provided by this utility model forms a cross-shaped structure with first and second guide vanes arranged perpendicular to each other. This unique cross-shaped guide vane design effectively guides and distributes airflow as it passes through, reducing impact and vortexes within the duct, thereby reducing noise and vibration.

[0029] Specifically, the first guide vane is primarily responsible for initially guiding and dispersing the airflow at the inlet of the guide tube, reducing noise caused by airflow directly impacting the tube wall. The second guide vane further refines the airflow's direction as it turns, ensuring smoother airflow as it passes through the axis angle, reducing resistance and noise caused by turbulent airflow.

[0030] Furthermore, the vertical placement of the guide assembly effectively controls airflow in all directions, enhancing the duct's versatility. Whether used in linear exhaust systems or complex exhaust systems requiring multiple turns, the duct provides stable exhaust performance and low noise levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 A schematic structural diagram of the air outlet duct provided in an embodiment of the present invention in a first installation state;

[0033] Figure 2 A schematic structural diagram of a guide tube provided by an embodiment of the present utility model at one angle;

[0034] Figure 3 A schematic structural diagram of a guide tube provided by an embodiment of the present utility model at one angle;

[0035] Figure 4 for Figure 3 Cross-section at AA;

[0036] Figure 5 A schematic structural diagram of a range hood provided by an embodiment of the present invention in a first installation state;

[0037] Figure 6 A schematic structural diagram of the air outlet duct provided in an embodiment of the present utility model in a second installation state;

[0038] Figure 7 A schematic structural diagram of the guide pipe and the check valve base provided by an embodiment of the present invention in one angle in the second installation state;

[0039] Figure 8 A schematic structural diagram of the guide pipe and the check valve base provided by an embodiment of the present invention in one angle in the second installation state;

[0040] Figure 9 for Figure 8 Schematic diagram of the structure at the middle BB;

[0041] Figure 10 A schematic structural diagram of a range hood provided by an embodiment of the present utility model in a second installation state;

[0042] Figure 11 This is a schematic diagram comparing the optimization effects of Dean vortex flow downstream of the draft tube outlet;

[0043] Figure 12 Schematic diagram for comparing the flow field optimization effects of the guide vane.

[0044] icon:

[0045] 100-hood;

[0046] 200-air outlet pipe; 210-valve plate fixing seat; 211-check valve column; 212-check valve plate; 213-limiting device;

[0047] 220- adapter; 221- first connection positioning groove;

[0048] 230 - flow guide tube; 231 - first connecting portion; 232 - second connecting portion; 233 - elbow portion; 234 - flow guide assembly; 2341 - first flow guide plate; 2342 - second flow guide plate; 235 - first thread; 236 - first connecting piece;

[0049] 240- bellows;

[0050] 250 - check valve base; 251 - second connection positioning groove; 252 - second thread. DETAILED DESCRIPTION

[0051] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are also within the scope of protection of the present invention.

[0053] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0054] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," "front," "back," and the like, indicating positions or location relationships, are based on the positions or location relationships shown in the accompanying drawings, or are the positions or location relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate the description of this utility model and to simplify the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0055] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0056] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0057] The following embodiments of the present invention are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features in the embodiments may be combined with each other.

[0058] The air outlet pipe 200 provided in the embodiment of the present invention includes a flow guide pipe 230, such as Figure 2 As shown, the guide tube 230 has a first connection portion 231 and a second connection portion 232. The first connection portion 231 is the inlet end of the guide tube 230, and the second connection portion 232 is the outlet end of the guide tube 230. There is an angle between the axis of the first connection portion 231 and the axis of the second connection portion 232. Figures 2 to 4 A guide assembly 234 is provided in the guide tube 230 . The guide assembly 234 includes a first guide plate 2341 and a second guide plate 2342 . The first guide plate 2341 and the second guide plate 2342 are arranged perpendicular to each other.

[0059] like Figure 11 , a velocity vector cloud diagram on the downstream section of the guide tube 230 is given. The left side shows the situation without the guide component, and the right side shows the situation with the guide component 234. It can be seen that when there is no guide component, obvious vortex stratification occurs on the downstream section. After adding the guide component 234, the velocity distribution is uniform and the Dean vortex disappears, indicating that the guide component 234 has an effective drag reduction effect.

[0060] like Figure 12 , the velocity, pressure cloud map and vector map at the cross section of the bend of the guide pipe 230 are given. From the pressure cloud map, it can be seen that when there are no diversion measures in the pipe, the high-speed airflow will impact the outer wall at the elbow, forming a large pressure gradient, which is the main source of secondary vibration noise of the smoke exhaust pipe. At the same time, a large negative pressure area is formed on the inner wall of the downstream. By observing the velocity vector map, it can be found that obvious vortex phenomenon is generated here, resulting in increased resistance, and the downstream fluid cannot return to a smooth state for a long distance. The distribution of the velocity cloud map also verifies the above view. However, after the guide component 234 is added, the impact at the elbow is significantly weakened, the pressure gradient is more moderate, and the downstream vortex area is significantly reduced.

[0061] See also Figure 2 and Figure 3 The air outlet duct 200 of the present invention forms a cross-shaped structure with the first guide vane 2341 and the second guide vane 2342 arranged perpendicularly to each other. This unique cross-shaped guide vane design effectively guides and distributes airflow as it passes through, reducing impact and vortexes within the duct, thereby reducing noise and vibration.

[0062] Specifically, the first guide vane 2341 is primarily responsible for initially guiding and dispersing the airflow at the inlet of the guide tube 230, thereby reducing noise caused by the airflow directly impacting the tube wall. The second guide vane 2342 further refines the airflow's direction as it turns, ensuring a smoother flow as it passes through the axis angle, reducing resistance and noise caused by turbulent airflow.

[0063] Furthermore, the vertical arrangement of the first guide plate 2341 and the second guide plate 2342 in the guide assembly 234 effectively controls the airflow of the air outlet duct 200 in different directions, enhancing the applicability of the air outlet duct 200. Whether in a linear exhaust system or a complex exhaust system requiring multiple turns, the air outlet duct 200 of the present invention can provide stable exhaust performance and low noise levels. This not only achieves drag and noise reduction in the user's environment, but also offers a high degree of applicability and flexibility, meeting diverse home improvement needs and exhaust system designs, providing users with a quiet and efficient kitchen exhaust solution.

[0064] In an optional solution of the embodiment of the present invention, the first guide plate 2341 is arranged along the radial direction of the first connecting portion 231, and the first guide plate 2341 passes through the center of the first connecting portion 231 in the horizontal direction; the second guide plate 2342 is arranged in the guide tube 230 along the extension direction of the guide tube 230, and the end of the second guide plate 2342 passes through the center of the first connecting portion 231 in the vertical direction. Specifically, as Figure 2 and Figure 3 As shown, the first guide vane 2341 and the second guide vane 2342 are cross-shaped and both pass through the center point of the circle. The first guide vane 2341 is a transverse guide vane, which is arranged radially along the first connecting portion 231. This radial layout helps to effectively guide and disperse the airflow immediately when it enters the guide tube 230, reducing the direct impact of the airflow on the tube wall, thereby reducing noise and vibration. Furthermore, the first guide vane 2341 is specifically designed to pass horizontally through the center of the first connecting portion 231. This layout ensures that the airflow is evenly distributed when entering the guide tube 230, avoiding the generation of local high-speed airflow, further reducing the impact of the airflow on the tube wall, and improving smoke exhaust efficiency.

[0065] Furthermore, the second guide vane 2342 is disposed within the guide tube 230 along its extension direction, with its end vertically passing through the center of the first connecting portion 231. This arrangement enables the second guide vane 2342 to effectively guide the airflow after it passes through the first guide vane 2341, ensuring a smooth transition of the airflow within the guide tube 230 and reducing resistance and noise caused by the airflow diversion.

[0066] Furthermore, the first guide vane 2341 and the second guide vane 2342 form a cross-shaped structure, each precisely passing through the center point of the circle. This cross-shaped layout is not only aesthetically pleasing but also has important functionality. The transverse guide vanes extend along the centerline of the elbow, ensuring that the airflow path in the elbow is as close to the centerline as possible, reducing friction on the pipe wall, thereby reducing energy loss and noise.

[0067] like Figure 1 、 Figure 4 and Figure 6 As shown, in the optional scheme of the embodiment of the present invention, the air outlet duct 200 also includes a valve plate fixing seat 210, and a check valve plate 212 is provided in the valve plate fixing seat 210, and the check valve plate 212 is rotatably installed in the valve plate fixing seat 210; the check valve plate 212 can open or cover the cross-section of the valve plate fixing seat 210, and the rotation setting of the check valve plate 212 in the valve plate fixing seat 210 allows the check valve plate 212 to be opened when needed to allow smoke to be discharged smoothly, or covered when not needed, effectively preventing external air from flowing back into, and flexibly controlling airflow interruption; further, the rotation installation method of the check valve plate 212 provides a smooth airflow transition, reduces the resistance of the airflow at the check valve plate 212, and thus improves the smoke exhaust efficiency.

[0068] like Figure 8 As shown, in an optional embodiment of the present invention, two check valve discs 212 are serially connected to the valve disc holder 210 via a check valve rod 211. This design allows for quick removal and installation, making it easier for users or maintenance personnel to clean and replace the discs, reducing maintenance costs and time. Furthermore, the design of two check valve discs 212 being serially connected to the valve disc holder 210 via the check valve rod 211 enhances structural stability, maintaining the stability and durability of the discs even in high wind speeds or under prolonged use.

[0069] In an optional solution of the embodiment of the present invention, the valve plate fixing seat 210 and the flow guide tube 230 have two installation states:

[0070] like Figures 1 to 5As shown, when in the first installation state, the first connecting portion 231 of the flow guide pipe 230 is connected to one end of the valve plate fixing seat 210, and the other end of the valve plate fixing seat 210 is connected to the range hood 100;

[0071] like Figures 6 to 10 As shown, when in the second installation state, the valve plate fixing seat 210 is connected to the second connecting portion 232 of the flow guide pipe 230 , and the first connecting portion 231 of the flow guide pipe 230 is connected to the range hood 100 .

[0072] By designing two installation methods, by changing the installation position of the valve plate fixing seat 210, the installation requirements of different ceiling heights can be met. When the ceiling height is sufficient, the valve plate fixing seat 210 is set at the front end of the guide pipe 230 along the direction of smoke flow. When the ceiling height is insufficient, the valve plate fixing seat 210 is set at the rear end of the guide pipe 230 along the direction of smoke flow, so as to avoid the check valve plate 212 being fully opened when the range hood is exhausting smoke. If the ceiling height is insufficient, it will interfere with the guide component 234 in the guide pipe 230, thereby meeting different installation requirements.

[0073] In an optional solution of the embodiment of the present invention, when in the first installation state, that is, when the flow guide pipe 230 is connected to the first connecting portion 231, if the rotation radius of the check valve disc 212 is M and the distance between the end of the first connecting portion 231 and the flow guide assembly 234 is N, then the relationship between N and M satisfies: N>M. This further ensures that when the valve disc holder 210 is installed at the front end of the flow guide pipe 230 along the direction of smoke flow, the check valve disc 212 will not interfere with the flow guide assembly 234 in the flow guide pipe 230 when in the open state.

[0074] like Figure 1 、 Figure 5 、 Figure 6 and Figure 10 As shown, in an optional solution of the embodiment of the present invention, the air outlet duct 200 further includes a bellows 240, which significantly improves the flexibility of the air outlet duct 200, enabling it to adapt to various installation environments, especially when space is limited or curved wiring is required.

[0075] Specifically, the bellows 240 has an air inlet end and an air outlet end. In the first installation state, as shown in FIG. Figure 1 As shown, the air inlet end of the bellows 240 is connected to the second connecting portion 232; in the second installation state, as shown Figure 6 As shown, the air inlet end of the bellows 240 is connected to the air outlet end of the valve plate fixing seat 210.

[0076] like Figure 8As shown, in an optional embodiment of the present invention, a stopper 213 is provided on the inner wall of the valve disc holder 210, which is protruded inwardly. The stopper 213 is arranged at the front end of the check valve disc 212 along the direction of smoke flow. Specifically, the stopper 213 is a boss provided on the inner wall of the valve disc holder 210. The boss ensures that the check valve disc 212 cannot be opened in the reverse direction of smoke flow, thereby preventing smoke backflow.

[0077] like Figure 1 、 Figure 5 、 Figure 6 、 Figure 9 and Figure 10 As shown, in an optional solution of the embodiment of the present utility model, the air outlet pipe 200 further includes an adapter 220, and the adapter 220 has an air inlet end and an air outlet end.

[0078] like Figure 1 As shown, in the first installation state, the air inlet end of the adapter 220 is connected to the valve plate fixing seat 210, and the air outlet end of the adapter 220 is connected to the first connecting part 231; when the installation height permits, by setting the adapter 220, the straight pipe section of the check valve base 250 can be increased, which can effectively stabilize the airflow and reduce resistance and swirl noise.

[0079] like Figure 6 As shown, in the second installation state, the air inlet end of the adapter 220 is connected to the second connecting portion 232 , and the air outlet end of the adapter 220 is connected to the valve plate fixing seat 210 .

[0080] In an optional solution of the embodiment of the present invention, the air outlet pipe 200 further includes a check valve base 250 .

[0081] like Figures 1 to 5 As shown, in the first installation state, the valve plate fixing seat 210 is arranged in the check valve base 250, the check valve base 250 protects the valve plate fixing seat 210, and the first end of the adapter 220 is connected to the air outlet end of the check valve base 250, as shown in FIG. Figure 1 As shown, the air outlet end of the adapter 220 is provided with four first connection positioning grooves 221 evenly distributed on the air outlet end of the adapter 220. Figure 7 As shown ( Figure 7 This is a view of the second installation state, but the structure of the adapter 220 is the same as that of the first installation state). The first connecting portion 231 has four first connecting members 236 that are adapted to the first connecting positioning groove 221, thereby satisfying installation in four directions of front, back, left, and right, thereby improving the adaptability of the installation of the air outlet duct 200.

[0082] like Figures 6 to 10As shown, in the second installation state, the air outlet end of the check valve base 250 is provided with four second connection positioning grooves 251 evenly distributed on the air outlet end of the check valve base 250, and the first connection part 231 has four first connection parts 236 adapted to the first connection positioning grooves 221, thereby meeting the installation in the four directions of front, back, left and right, and improving the adaptability of the installation of the air outlet duct 200.

[0083] Furthermore, the valve plate fixing seat 210 is disposed in the adapter 220 , and the adapter 220 is connected to the second connecting portion 232 . The adapter 220 plays a role in protecting the valve plate fixing seat 210 .

[0084] Specifically, such as Figure 1 As shown, the first connection positioning groove 221 and the second connection positioning groove 251 on the adapter 220 have the same structure, both including an inlet groove and a limit groove. The inlet groove of the second connection positioning groove 251 arranged on the check valve base 250 is connected to the end of the check valve base 250 connected to the adapter 220, and is extended along the axis of the check valve base 250. The limit groove arranged on the check valve base 250 is connected to the inlet groove and extends along the circumferential direction of the check valve base 250; the inlet groove of the first connection positioning groove 221 arranged on the adapter 220 is connected to the end of the adapter 220 connected to the guide pipe 230, and is extended along the axial direction of the adapter 220. The limit groove arranged on the adapter 220 is connected to the inlet groove and extends along the circumferential direction of the adapter 220.

[0085] During installation, if Figure 1 As shown, when in the first installation state, the four first connecting members 236 on the first connecting portion 231 of the guide tube 230 enter the introduction groove from the ends of the four first connecting positioning grooves 221 on the swivel joint 220, are inserted axially, and then rotated along the extension direction of the limiting groove, so that the four first connecting members 236 can enter the limiting groove along the extension direction of the limiting groove, thereby realizing the installation of the guide tube 230 and the swivel joint 220. When in the second installation state, as shown Figure 6 As shown, the four first connecting members 236 on the first connecting portion 231 of the guide tube 230 respectively enter the introduction groove from the ends of the four second connecting positioning grooves 251 on the check valve base 250, are inserted axially, and then rotated along the extension direction of the limit groove, so that the four first connecting members 236 can enter the limit groove along the extension direction of the limit groove, thereby realizing the installation of the guide tube 230 and the check valve base 250, which is easy to install.

[0086] Furthermore, if Figure 2As shown, since the four first connecting and positioning grooves 221 at the end of the adapter 220 have the same structure and are compatible with the first connecting member 236 on the guide tube 230, the guide tube 230 can be installed in a reversible direction, meeting the adjustment of the air guide direction and improving its adaptability. Specifically, the connecting and positioning grooves and the connecting members compatible with the connecting and positioning grooves referred to in the present invention are male and female buckle structures commonly used in the field.

[0087] See also Figures 1 to 10 In an optional solution of an embodiment of the present invention, the guide pipe 230 includes a curved pipe portion 233. The streamlined design of the curved pipe portion 233 can allow the smoke to flow more smoothly, thereby meeting the need to reduce noise. One end of the curved pipe portion 233 is connected to the first connecting portion 231, and the other end of the curved pipe portion 233 is connected to the second connecting portion 232. The angle between the axes of the first connecting portion 231 and the second connecting portion 232 is 90°, so that the length of the first connecting portion 231 can be extended as much as possible while meeting the installation height requirement, thereby further reducing noise.

[0088] See also Figure 1 In an optional solution of the embodiment of the present utility model, the air outlet end of the check valve base 250 has a second thread 252, and the air inlet end of the adapter 220 has a first internal thread (not shown in the figure) adapted to the second thread 252. Figure 6 The second connecting portion 232 of the guide tube 230 has a first thread 235 on its outer side. The first thread 235 is consistent with the second thread 252 , thereby facilitating the transposition installation of the adapter 220 .

[0089] like Figure 5 and Figure 10 As shown, the present invention provides a range hood, a range hood and an air outlet pipe 200 and a range hood 100 as described above, wherein the air outlet pipe 200 is connected to the top of the range hood 100 .

[0090] like Figures 1 to 5 As shown, in the first installation state, the adapter 220 is threadedly connected to the check valve base 250. The flow guide tube 230 is connected to the adapter 220 via a male and female buckle. This allows adjustment in four directions (front, back, left, and right) to suit different home environments. The valve plate holder 210 is screwed to the check valve base 250. Finally, the bellows 240 is connected to the outlet of the flow guide tube 230 and secured with tape. This installation method requires sufficient ceiling height in the user's home.

[0091] R4 is the outer diameter of the outlet connection section of the air guide duct 230, and R3 is the outer diameter of the inner ring connected to the aluminum foil smoke exhaust pipe, which needs to be smaller than the inner diameter of the smoke exhaust pipe. The air guide duct 230 is connected to the adapter 220 through male and female buckles, wherein the male buckle is located on the inner wall of the outer ring of the air guide duct 230, and the female buckle is located on the outer surface of the adapter interface of the adapter 220. It can be fixed in four directions. The case shown in the accompanying drawings is a typical configuration of the air outlet facing right in the national standard test environment. This display helps to intuitively understand the structure and installation method of the air outlet duct 200. However, the design of the present invention is highly flexible and adaptable, allowing the air outlet duct 200 to be installed in different directions to accommodate diverse kitchen layouts and smoke exhaust requirements. Its versatility and flexibility allow the air outlet duct 200 to be installed in other directions, which is easy to understand for installers with relevant technical knowledge. The valve disc radius R1 is slightly smaller than the inner radius of the valve disc holder 210. The turning radius of the elbow 233 should be as large as possible within the remaining space in the ceiling. A larger turning radius reduces flow resistance. After connection, the height H1 from the bottom of the flow guide assembly 234 to the check valve disc 212 should be greater than the valve disc radius R1 to ensure non-interference after blowing.

[0092] It's important to note that the first installation state is necessary because the air delivered from the centrifugal fan outlet is not perpendicular to the range hood top plate, but rather at an angle. If the installation height permits, adding a straight section to the check valve base 250 can effectively stabilize the airflow, reducing resistance and swirl noise. Furthermore, when the check valve disc 212 is inflated, it forms an interference fit with the guide assembly 234 within the guide tube 230. Studies have shown that interference fit can further reduce drag.

[0093] like Figures 6 to 10 As shown, the second installation position is suitable for situations where the installation height is insufficient to install the adapter 220 on the check valve disc 212. In this case, the male buckle on the flow guide tube 230 connects to the female buckle on the check valve base 250, also allowing for four-way operation. Due to limited installation space, if the check valve disc 212 is installed at the front end, it will interfere with the flow guide disc when inflated. Therefore, the check valve disc 212 is connected to the outlet of the flow guide tube 230 via the adapter 220. In this installation position, the adapter 220 has a structure reserved for securing the valve disc holder 210. The valve disc holder 210 and the adapter 220 are screwed together, similar to how they are connected to the original check valve base 250. The male thread of the adapter 220 is locked to the female thread at the outlet of the flow guide tube 230. Finally, the aluminum foil bellows 240 is connected to the inner ring of the valve disc holder 210, secured with tape or a metal ring.

[0094] Specifically, the check valve disc 212 is installed at the outlet of the guide pipe 230, and the boss is integrally formed with the valve disc fixing seat 210. By setting the boss, the check valve disc 212 can be guaranteed not to flip back in both installation modes. Figure 8 , H2 is the height of the outer ring at the entrance of the elbow, which should not exceed the female thread to prevent interference.

[0095] This utility model provides a flow guide duct 230 and range hood with significant drag and noise reduction, aiming to provide users with a flexible and efficient smoke exhaust solution suitable for diverse home decoration environments. It takes into account the coordination with the check valve to ensure optimal performance under different installation conditions. The cross-flow guide elbow used in the smoke exhaust section, its connection structure and installation method to the check valve on the range hood body, can adapt to most user installation environments.

[0096] The air outlet duct 200 and range hood of the present invention take into account ceiling height restrictions in residential environments, allowing users to flexibly adjust the position and angle of the check valve to suit specific home space conditions. This increased adjustability not only improves the adaptability of the smoke exhaust system but also ensures optimal smoke exhaust performance within limited spaces.

[0097] Furthermore, the deflector structure within the air outlet duct 200 has been carefully calculated and optimized to ensure a smooth transition of airflow through the curved duct, minimizing turbulence and eddies. This design helps reduce noise levels throughout the exhaust system while also improving exhaust efficiency and minimizing energy loss.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air outlet pipe, characterized in that: include: A flow guide pipe (230), the flow guide pipe (230) having a first connecting portion (231) and a second connecting portion (232), the first connecting portion (231) being the inlet end of the flow guide pipe (230), the second connecting portion (232) being the outlet end of the flow guide pipe (230), and an angle being formed between an axis of the first connecting portion (231) and an axis of the second connecting portion (232); A flow guide assembly (234) is provided in the flow guide tube (230), and the flow guide assembly (234) comprises a first flow guide plate (2341) and a second flow guide plate (2342), wherein the first flow guide plate (2341) and the second flow guide plate (2342) are arranged perpendicular to each other.

2. The air outlet pipe according to claim 1, characterized in that: The first guide plate (2341) is arranged along the radial direction of the first connecting portion (231), and the first guide plate (2341) passes through the center of the first connecting portion (231) in a horizontal direction; The second guide plate (2342) is arranged along the extension direction of the guide tube (230), and the end of the second guide plate (2342) passes through the center of the first connecting portion (231) in the vertical direction.

3. The air outlet pipe according to claim 1, characterized in that , further comprising a valve plate fixing seat (210), wherein a check valve plate (212) is provided in the valve plate fixing seat (210), and the check valve plate (212) is rotatably mounted in the valve plate fixing seat (210); The valve plate fixing seat (210) and the flow guide pipe (230) have two installation states: When in the first installation state, the first connecting portion (231) of the flow guide tube (230) is connected to the valve plate fixing seat (210); When in the second installation state, the valve plate fixing seat (210) is connected to the second connecting portion (232) of the flow guide pipe (230).

4. The air outlet duct according to claim 3, characterized in that: When the first connecting portion (231) of the flow guide pipe (230) is connected to the valve plate fixing seat (210), the distance between the end of the first connecting portion (231) and the flow guide component (234) is greater than the rotation radius of the check valve plate (212).

5. The air outlet duct according to claim 3, characterized in that: Also included is a bellows (240), wherein the bellows (240) has an air inlet end and an air outlet end; In a first installation state, the air inlet end of the bellows (240) is connected to the second connecting portion (232); In the second installation state, the air inlet end of the bellows (240) is connected to the air outlet end of the valve plate fixing seat (210).

6. The air outlet duct according to claim 3, characterized in that: The inner wall of the valve plate fixing seat (210) is protruding inwards and is provided with a limiting device (213), and the limiting device (213) is arranged at the front end of the check valve plate (212) along the direction of smoke flow.

7. The air outlet duct according to any one of claims 3 to 6, characterized in that: It also includes an adapter (220), wherein the adapter (220) has an air inlet end and an air outlet end. In the first installation state, the air inlet end of the adapter (220) is connected to the valve plate fixing seat (210), and the air outlet end of the adapter (220) is connected to the first connecting portion (231); In the second installation state, the air inlet end of the adapter (220) is connected to the second connecting portion (232), and the air outlet end of the adapter (220) is connected to the valve plate fixing seat (210).

8. The air outlet duct according to claim 7, characterized in that: Also included is a check valve seat (250); In a first installation state, the valve plate fixing seat (210) is arranged in the check valve base (250), the air inlet end of the adapter (220) is connected to the air outlet end of the check valve base (250), the adapter (220) is provided with four first connection positioning grooves (221) evenly distributed at the air outlet end of the adapter (220), and the first connection portion (231) has four connection pieces adapted to the first connection positioning grooves (221); In the second installation state, the check valve base (250) is provided with four second connection positioning grooves (251) evenly distributed at the air outlet end of the check valve base (250), the first connection portion (231) has four connecting pieces adapted to the first connection positioning grooves (221), the check valve base (250) is arranged in the adapter (220), and the adapter (220) is connected to the second connection portion (232) of the guide pipe (230).

9. The air outlet duct according to claim 1, characterized in that: The flow guide pipe (230) comprises a curved pipe portion (233), one end of the curved pipe portion (233) is connected to the first connecting portion (231), and the other end of the curved pipe portion (233) is connected to the second connecting portion (232), and the angle between the axes of the first connecting portion (231) and the second connecting portion (232) is 90°.

10. A range hood, characterized in that: It comprises a range hood (100) and an air outlet pipe (200) according to any one of claims 1 to 9, wherein the air outlet pipe (200) is installed on the top of the range hood (100).

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