Air outlet air duct and air outlet device

Abstract

The utility model relates to the technical field of household appliances discloses air outlet air channel and air outlet device, air outlet air channel includes: first wind wall, its air inlet end is connected with the air deflector, and the air deflector is suitable for surrounding the wind wheel, second wind wall is arranged opposite with first wind wall, and the air deflector extends towards second wind wall and forms the air inlet gap between second wind wall, the annular air channel is formed between second wind wall and first wind wall, and the annular air channel is suitable for surrounding the wind wheel, and the spacing between first wind wall and second wind wall gradually reduces along the flow direction of airflow, the utility model discloses the air deflector is set to the air inlet end of first wind wall, and the air deflector extends towards second wind wall and forms the air inlet gap between second wind wall, when the wind wheel works, can smoothly guide flow to the wind wheel, can effectively reduce the wind resistance, reduce the noise, reduce the energy loss.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, specifically to air outlet ducts and air outlet devices. Background Technology

[0002] The heating devices of related technologies generally use PTC heating elements. The PTC heating element heats the air to achieve the transfer of warm air. Due to the compact spatial structure design of the heating device, the PTC heating element is usually placed at the air outlet, which blocks part of the air outlet area. As a result, the coverage area, wind speed and air volume of the heating device are generally very small, and the air delivery distance is also short, which leads to slow heating of the whole room. Utility Model Content

[0003] In view of this, the present invention provides an air outlet duct and an air outlet device to solve the problems of low wind speed and short air delivery distance in related technologies for heating air devices.

[0004] Firstly, this utility model provides an air outlet duct, comprising:

[0005] The first wind wall has an air inlet end connected to a guide wall, which is adapted to surround the wind turbine.

[0006] The second wind wall is disposed opposite to the first wind wall. The wind guide wall extends toward the second wind wall and forms an air intake gap with the second wind wall. An annular air duct is formed between the second wind wall and the first wind wall. The annular air duct is adapted to surround the wind wheel. Along the flow direction of the airflow, the distance between the first wind wall and the second wind wall gradually decreases.

[0007] Beneficial effects: By setting a guide wall at the air inlet end of the first wind wall, extending towards the second wind wall and forming an air inlet gap between them, the airflow can be smoothly guided to the wind wheel during operation, effectively reducing wind resistance, noise, and energy loss. Since the annular duct surrounds the wind wheel, the airflow enters the annular duct under the action of the wind wheel and flows along it. As the distance between the first and second wind walls gradually decreases, local turbulent kinetic energy on the wall surface is reduced, improving wind concentration, effectively guiding airflow, reducing flow losses within the duct, and pressurizing and accelerating the airflow, increasing air volume, wind speed, and delivery distance, thereby expanding the blowing coverage area.

[0008] In one optional embodiment, the surface of the air guide wall is streamlined, or the inner diameter of the air guide wall gradually increases or decreases along the airflow direction.

[0009] Beneficial effects: The air guide wall can effectively reduce wind resistance, noise, and energy loss.

[0010] In one optional embodiment, the air guide wall is connected to the first air wall by an arc segment with a radius of R, where R > 2 mm.

[0011] Beneficial effects: The connection between the air guide wall and the first air wall via an arc segment allows for a smooth transition of airflow, reducing energy loss and lowering airflow noise.

[0012] In one optional embodiment, the distance between the air guide wall and the second air wall is h, where h ≥ 20 mm.

[0013] Beneficial effects: The distance between the guide wall and the second wind wall is greater than or equal to 20 mm, which reduces the obstruction of airflow and can reduce local turbulence and eddies.

[0014] In one alternative implementation, the first wind wall and the second wind wall are designed asymmetrically.

[0015] Beneficial effects: Due to the asymmetrical design of the first and second wind walls, the airflow can adhere to the wall surface during flow, reducing local turbulent kinetic energy on the wall surface, improving wind concentration, effectively guiding airflow, and reducing flow losses within the duct.

[0016] In one alternative implementation, the first air wall is streamlined or straight, and the second air wall is straight.

[0017] Beneficial effects: The first wind wall is streamlined or straight, and the second wind wall is streamlined. The airflow is smoother when it flows through the annular air duct, which can reduce the local turbulent kinetic energy of the wall surface, improve the concentration of wind force, effectively guide the airflow, and reduce the flow loss in the air duct.

[0018] In one alternative embodiment, the second wind wall extends in the radial direction of the wind turbine.

[0019] Beneficial effects: The second wind wall extends along the radial direction of the wind turbine. The structure of the second wind wall is simple and easy to process and shape.

[0020] In one optional embodiment, a tangent is drawn through the air inlet end of the first air wall, and the angle between the tangent and the second air wall is α, where 0° < α ≤ 35°.

[0021] Beneficial effect: The angle between the tangent at the air inlet end of the first air wall and the second air wall is less than or equal to 35°, which can reduce the space occupied by the air outlet duct in the axial direction.

[0022] In one alternative implementation, 5°≤α≤20°.

[0023] Beneficial effects: The first and second wind walls have a certain opening, which avoids excessive contraction of the first and second wind walls, which would lead to airflow separation and a surge in noise.

[0024] In one alternative embodiment, along the flow direction of the airflow, the first wind wall is connected to a first guide surface, the first guide surface extending along the axial direction of the wind turbine, and the second wind wall is connected to a second guide surface, the second guide surface cooperating with the first wind wall to guide the airflow from radial flow along the wind turbine to axial flow toward the wind turbine.

[0025] Beneficial effects: The first wind wall is connected to the first guide surface, which extends along the axial direction of the impeller. The second wind wall is connected to the second guide surface. The second guide surface works with the first wind wall to guide the airflow from radial flow along the impeller to axial flow towards the impeller, changing the direction of the airflow. This can further pressurize and accelerate the airflow, increase the air volume, wind speed and air delivery distance, thereby expanding the blowing coverage area.

[0026] In one optional embodiment, the maximum distance between the first wind wall and the second wind wall is R1, the distance between the connection point of the second wind wall and the second guide surface and the first wind wall is R2, and the distance between the end of the second guide surface and the first guide surface is R3, where R1 > R2 and / or R2 ≥ R3.

[0027] Beneficial effects: The maximum distance between the first and second wind walls is R1, and the distance between the connection point of the second wind wall and the second guide surface and the first wind wall is R2. R1 > R2, which can reduce the local turbulent kinetic energy of the walls, improve wind concentration, effectively guide airflow, reduce flow losses in the duct, and pressurize and accelerate the airflow, increasing air volume, wind speed, and delivery distance, thereby expanding the blowing coverage area. The distance between the end of the second guide surface and the first guide surface is R3, and R2 ≥ R3, which can further pressurize and accelerate the airflow, increasing air volume, wind speed, and delivery distance.

[0028] Secondly, this utility model also provides an air outlet device, comprising:

[0029] The wind turbine and the air outlet duct, wherein the annular air outlet duct surrounds the wind turbine.

[0030] Beneficial effects: By setting a guide wall at the air inlet end of the first wind wall, extending towards the second wind wall and forming an air inlet gap between them, the airflow can be smoothly guided to the wind wheel during operation, effectively reducing wind resistance, noise, and energy loss. Since the annular duct surrounds the wind wheel, the airflow enters the annular duct under the action of the wind wheel and flows along it. As the distance between the first and second wind walls gradually decreases, local turbulent kinetic energy on the wall surface is reduced, improving wind concentration, effectively guiding airflow, reducing flow losses within the duct, and pressurizing and accelerating the airflow, increasing air volume, wind speed, and delivery distance, thereby expanding the blowing coverage area.

[0031] In one optional embodiment, the distance between the wind turbine and the wind guide wall is d, where 3 mm ≤ d ≤ 6 mm.

[0032] Beneficial effects: If the distance between the impeller and the guide wall is too small, the airflow will be compressed between the two, increasing local resistance and potentially causing turbulence, which will reduce air volume and air pressure. Therefore, keeping the distance between the impeller and the guide wall between 3 mm and 6 mm can avoid increasing local resistance and causing turbulence.

[0033] In one optional embodiment, the air outlet device includes:

[0034] The support has a second wind wall, and the wind turbine is located on the inner side of the wind guide wall;

[0035] The wind wall structure forms the first wind wall;

[0036] The rear net is connected to the side of the wind wall structure away from the support. An air inlet screen is provided at the center of the rear net, and the air inlet screen is opposite to the wind wheel.

[0037] Beneficial effects: When the impeller is working, the airflow passes through the air inlet mesh at the center of the rear net and enters the air outlet device. The guide walls smoothly guide the airflow to the impeller, effectively reducing wind resistance, noise, and energy loss. Because the annular duct surrounds the impeller, the airflow enters the annular duct under the impeller's influence and flows along it. As the distance between the first and second wind walls gradually decreases, local turbulent kinetic energy on the wall surfaces is reduced, improving wind concentration, effectively guiding the airflow, reducing flow losses within the duct, and pressurizing and accelerating the airflow, increasing air volume, wind speed, and delivery distance, thereby expanding the blowing coverage area.

[0038] In one optional embodiment, the bracket is provided with a wind turbine mounting reference surface, and the distance between the wind turbine and the wind turbine mounting reference surface in the axial direction of the wind turbine is h1, where 2 mm ≤ h1 ≤ 5 mm.

[0039] Beneficial effects: The distance between the wind turbine and the wind turbine mounting reference plane on the axial direction of the wind turbine is 2mm-5mm, which can avoid the formation of turbulence between the wind turbine and the support, and ensure that the wind generated by the wind turbine flows out smoothly.

[0040] In one optional embodiment, the air inlet screen is a spherical surface convex in a direction away from the impeller. The impeller includes blades, which have a highest position near the air inlet screen and a lowest position away from the air inlet screen. The minimum distance between the highest position and the air inlet screen is h2, and the maximum distance between the highest position and the air inlet screen is h3, where h2 ≥ 10 mm and / or h3 ≥ 15 mm and / or the distance between the lowest position and the air guide wall is h4, where h4 ≥ 0 mm.

[0041] Beneficial effects: The minimum distance between the highest position and the air inlet screen is h2, and the maximum distance between the highest position and the air inlet screen is h3, with h2 ≥ 10 mm and / or h3 ≥ 15 mm, which can prevent local turbulence caused by an excessively small distance between the air inlet screen and the impeller. The distance between the lowest position and the guide wall is h4, with h4 ≥ 0 mm, which can prevent the increase of local resistance from causing turbulence.

[0042] In one alternative implementation, the air outlet device is a heater.

[0043] In one alternative embodiment, the air outlet device further includes a heating element disposed on the bracket and located at the outlet of the air outlet duct.

[0044] Beneficial effects: When the impeller is working, the airflow passes through the air inlet mesh at the center of the rear screen and enters the air outlet device. The guide walls smoothly guide the airflow to the impeller, effectively reducing wind resistance, noise, and energy loss. Because the annular duct surrounds the impeller, the airflow enters the annular duct under the impeller's influence and flows along it. As the distance between the first and second wind walls gradually decreases, local turbulent kinetic energy on the wall surfaces is reduced, improving airflow concentration, effectively guiding the airflow, reducing flow losses within the duct, and pressurizing and accelerating the airflow, increasing air volume, wind speed, and delivery distance. When the airflow exits the outlet duct, it is heated to form hot air, thereby expanding the hot air blowing coverage area. Attached Figure Description

[0045] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0046] Figure 1This is a schematic diagram of an air outlet duct according to an embodiment of the present utility model;

[0047] Figure 2 This is a cross-sectional view of an air outlet device according to an embodiment of the present utility model. Figure 1 ;

[0048] Figure 3 This is a cross-sectional view of an air outlet device according to an embodiment of the present utility model. Figure 2 ;

[0049] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0050] Figure 5 A cross-sectional view of an air outlet device according to an embodiment of this utility model, with the airflow direction marked.

[0051] Figure 6 This is a cross-sectional view of the windbreak structure.

[0052] Explanation of reference numerals in the attached figures:

[0053] 1. Wind wall structure; 101. First wind wall; 102. Air guide wall; 103. First air guide surface; 2. Support; 201. Second wind wall; 202. Second air guide surface; 203. Wind wheel mounting reference surface; 3. Annular air duct; 4. Air outlet duct; 5. Wind wheel; 501. Blades; 6. Rear screen; 601. Air inlet screen. Detailed Implementation

[0054] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0055] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0056] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0057] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0058] The heating devices of related technologies generally use PTC heating elements. The PTC heating element heats the air to achieve the transfer of warm air. Due to the compact spatial structure design of the heating device, the PTC heating element is usually placed at the air outlet, which blocks part of the air outlet area. As a result, the coverage area, wind speed and air volume of the heating device are generally very small, and the air delivery distance is also short, which leads to slow heating of the whole room.

[0059] The following is combined with Figures 1 to 6 The following describes embodiments of the present invention.

[0060] According to an embodiment of the present invention, an air outlet duct is provided, including a first air wall 101 and a second air wall 201.

[0061] The air inlet end of the first wind wall 101 is connected to a guide wall 102, which is adapted to surround the impeller 5. The second wind wall 201 is arranged opposite to the first wind wall 101. The guide wall 102 extends toward the second wind wall 201 and forms an air inlet gap with the second wind wall 201. An annular air duct 3 is formed between the second wind wall 201 and the first wind wall 101. The annular air duct 3 is adapted to surround the impeller 5. Along the flow direction of the airflow, the distance between the first wind wall 101 and the second wind wall 201 gradually decreases.

[0062] In this embodiment, by setting an air guide wall 102 at the air inlet end of the first air wall 101, the air guide wall 102 extends toward the second air wall 201 and forms an air inlet gap with the second air wall 201. When the impeller 5 is working, the airflow can be smoothly guided to the impeller 5, which can effectively reduce wind resistance, reduce noise, and reduce energy loss. Since the annular air duct 3 surrounds the impeller 5, under the action of the impeller 5, the airflow enters the annular air duct 3 and flows along the annular air duct 3. As the distance between the first air wall 101 and the second air wall 201 gradually decreases, the local turbulent kinetic energy of the wall surface can be reduced, the wind force can be concentrated, the airflow can be effectively guided, the flow loss in the air duct can be reduced, and the airflow can be pressurized and accelerated, increasing the air volume, wind speed and air delivery distance, thereby expanding the blowing coverage area.

[0063] When the airflow blown out from the air outlet passes through the heating element, the heating element heats the airflow to form hot air, which can increase the air volume, air speed and air delivery distance of the hot air, thereby expanding the hot air coverage area.

[0064] In one embodiment, the wall surface of the air guide wall 102 is streamlined, or the inner diameter of the air guide wall 102 gradually increases or decreases along the airflow direction.

[0065] In this embodiment, the air guide wall 102 can effectively reduce wind resistance, noise, and energy loss.

[0066] Specifically in one embodiment, such as Figure 1 and Figure 6 As shown, the air guide wall 102 is located at the air inlet end of the first air wall 101 and extends along the axial direction of the impeller 5.

[0067] In one embodiment, the wind guide wall 102 and the first wind wall 101 are connected by an arc segment with a radius of R, where R > 2 mm.

[0068] In this embodiment, the air guide wall 102 and the first air wall 101 are connected by an arc segment, which can make the airflow transition smoothly, reduce energy loss, and reduce airflow noise.

[0069] In one embodiment, the distance between the wind guide wall 102 and the second wind wall 201 is h, where h ≥ 20 mm.

[0070] In this embodiment, the distance between the wind guide wall 102 and the second wind wall 201 is greater than or equal to 20 mm, which reduces the obstruction to airflow and can reduce local turbulence and eddies.

[0071] It should be noted that the greater the distance between the guide wall 102 and the second wind wall 201, the better. Due to the limitation of installation space, it is preferable that the distance between the guide wall 102 and the second wind wall 201 is greater than or equal to 20 mm. If the distance between the guide wall 102 and the second wind wall 201 is small, it is easy to lead to enhanced local turbulence and eddies.

[0072] In one embodiment, the first wind wall 101 and the second wind wall 201 are designed asymmetrically.

[0073] In this embodiment, due to the asymmetrical design of the first wind wall 101 and the second wind wall 201, the airflow can adhere to the wall surface during flow, reducing the local turbulent kinetic energy of the wall surface, improving wind concentration, effectively guiding the airflow, and reducing flow loss in the duct.

[0074] In one embodiment, the first wind wall 101 is streamlined or straight, and the second wind wall 201 is straight.

[0075] In this embodiment, the first wind wall 101 is streamlined or straight, and the second wind wall 201 is streamlined. The airflow is smoother when it flows through the annular air duct 3, which can reduce the local turbulent kinetic energy of the wall surface, improve the concentration of wind force, effectively guide the airflow, and reduce the flow loss in the air duct.

[0076] Specifically in one embodiment, such as Figure 1 As shown, the first wind wall 101 is streamlined.

[0077] In one embodiment, the second wind wall 201 extends in the radial direction of the wind turbine 5.

[0078] In this embodiment, the second wind wall 201 extends along the radial direction of the wind turbine 5. The structure of the second wind wall 201 is simple and easy to process and shape.

[0079] In one specific embodiment, the second wind wall 201 is formed on the support 2. Since the second wind wall 201 extends along the radial direction of the wind turbine 5, the second wind wall 201 is flat at the end of the support 2. The structure of the support 2 is simple and easy to process and form.

[0080] In one embodiment, a tangent is drawn through the air inlet end of the first wind wall 101, and the angle between the tangent and the second wind wall 201 is α, where 0° < α ≤ 35°.

[0081] In this embodiment, the angle between the tangent at the air inlet end of the first air wall 101 and the second air wall 201 is less than or equal to 35°, which can reduce the space occupied by the air outlet duct in the axial direction.

[0082] In a preferred embodiment, 5°≤α≤20°.

[0083] In this embodiment, the first wind wall 101 and the second wind wall 201 have a certain opening to avoid excessive contraction of the first wind wall 101 and the second wind wall 201, which would lead to airflow separation and a surge in noise.

[0084] In one specific embodiment, α = 15°.

[0085] In one specific embodiment, α = 20°.

[0086] In one specific embodiment, α = 10°.

[0087] In one specific embodiment, α = 5°.

[0088] In one embodiment, along the flow direction of the airflow, the first wind wall 101 is connected to the first guide surface 103, which extends along the axial direction of the impeller 5. The second wind wall 201 is connected to the second guide surface 202, which cooperates with the first wind wall 101 to guide the airflow from radial flow along the impeller 5 to axial flow towards the impeller 5.

[0089] In this embodiment, the first wind wall 101 is connected to the first guide surface 103, which extends along the axial direction of the impeller 5. The second wind wall 201 is connected to the second guide surface 202. The second guide surface 202 cooperates with the first wind wall 101 to guide the airflow from radial flow along the impeller 5 to axial flow towards the impeller 5. By changing the direction of the airflow, the airflow can be further pressurized and accelerated, increasing the air volume, wind speed and air delivery distance, thereby expanding the blowing coverage area.

[0090] In one specific embodiment, the air outlet duct further includes an air outlet flow channel 4, which extends along the axial direction of the impeller 5. The second guide surface 202 cooperates with the first wind wall 101 to guide the airflow annular duct 3 into the air outlet flow channel 4.

[0091] Since the air outlet duct 4 extends along the axial direction of the impeller 5, when the airflow blown out from the air outlet duct passes through the heating element, the heating element heats the airflow to form hot air, which can improve the airflow concentration effect and quickly raise the temperature.

[0092] In one embodiment, the maximum distance between the first wind wall 101 and the second wind wall 201 is R1, the distance between the connection point of the second wind wall 201 and the second guide surface 202 and the first wind wall 101 is R2, and the distance between the end of the second guide surface 202 and the first guide surface 103 is R3, where R1 > R2 and / or R2 ≥ R3.

[0093] In this embodiment, the maximum distance between the first wind wall 101 and the second wind wall 201 is R1, and the distance between the connection point of the second wind wall 201 and the second guide surface 202 and the first wind wall 101 is R2, where R1 > R2. This reduces the local turbulent kinetic energy of the wall surface, enhances wind concentration, effectively guides airflow, reduces flow losses within the duct, and can pressurize and accelerate the airflow, increasing air volume, wind speed, and delivery distance, thereby expanding the blowing coverage area. The distance between the end of the second guide surface 202 and the first guide surface 103 is R3, where R2 ≥ R3, which further pressurizes and accelerates the airflow, increasing air volume, wind speed, and delivery distance.

[0094] In a preferred embodiment, R1 > R2, and R2 ≥ R3.

[0095] In a preferred embodiment, R3 ≥ 20 mm.

[0096] In one specific embodiment, R1 = R2 = 25 mm, R1 = 45 mm.

[0097] In one specific embodiment, the first guide surface 103 is straight or streamlined, and the second guide surface 202 is straight or streamlined.

[0098] Specifically, the second guide surface 202 is streamlined, and the first guide surface 103 is straight.

[0099] According to an embodiment of the present invention, another aspect provides an air outlet device, including a wind turbine 5 and an air outlet duct provided in the above embodiment, with an annular duct 3 surrounding the wind turbine 5.

[0100] In this embodiment, by setting an air guide wall 102 at the air inlet end of the first air wall 101, the air guide wall 102 extends toward the second air wall 201 and forms an air inlet gap with the second air wall 201. When the impeller 5 is working, the airflow can be smoothly guided to the impeller 5, which can effectively reduce wind resistance, reduce noise, and reduce energy loss. Since the annular air duct 3 surrounds the impeller 5, under the action of the impeller 5, the airflow enters the annular air duct 3 and flows along the annular air duct 3. As the distance between the first air wall 101 and the second air wall 201 gradually decreases, the local turbulent kinetic energy of the wall surface can be reduced, the wind force can be concentrated, the airflow can be effectively guided, the flow loss in the air duct can be reduced, and the airflow can be pressurized and accelerated, increasing the air volume, wind speed and air delivery distance, thereby expanding the blowing coverage area.

[0101] In one embodiment, the distance between the wind turbine 5 and the wind guide wall 102 is d, where 3 mm ≤ d ≤ 6 mm.

[0102] In this embodiment, if the distance between the impeller 5 and the guide wall 102 is too small, the airflow will be compressed between the two, increasing local resistance and potentially causing turbulence, which will reduce the air volume and air pressure. Therefore, keeping the distance between the impeller 5 and the guide wall 102 between 3 mm and 6 mm can avoid increasing local resistance and causing turbulence.

[0103] In a preferred embodiment, 3.5 mm ≤ d ≤ 4.5 mm.

[0104] In one embodiment, the air outlet device includes a support 2, a wind wall structure 1, and a rear screen 6. The support 2 forms a second wind wall 201, and the impeller 5 is located inside the wind guide wall 102; the wind wall structure 1 forms a first wind wall 101; the rear screen 6 is connected to the side of the wind wall structure 1 away from the support 2, and an air inlet screen 601 is provided at the center of the rear screen 6, which is opposite to the impeller 5.

[0105] In this embodiment, when the impeller 5 is working, the airflow passes through the air inlet mesh 601 at the center of the rear mesh 6 and enters the air outlet device. The guide wall 102 can smoothly guide the airflow to the impeller 5, which can effectively reduce wind resistance, noise, and energy loss. Since the annular air duct 3 surrounds the impeller 5, the airflow enters the annular air duct 3 under the action of the impeller 5 and flows along the annular air duct 3. As the distance between the first air wall 101 and the second air wall 201 gradually decreases, the local turbulent kinetic energy of the wall surface can be reduced, the wind force can be concentrated, the airflow can be effectively guided, the flow loss in the air duct can be reduced, and the airflow can be pressurized and accelerated, increasing the air volume, wind speed, and air delivery distance, thereby expanding the blowing coverage area.

[0106] In one specific embodiment, the second guide surface 202 is formed on the support 2, and the first guide surface 103 can be formed on the support 2 or on the wind wall structure 1. When the first guide surface 103 is formed on the wind wall structure 1, the first guide surface 103 extends into the interior of the support 2.

[0107] In one specific embodiment, the wind turbine 5 is a centrifugal wind turbine or an axial flow wind turbine.

[0108] In one embodiment, the bracket 2 is provided with a wind turbine mounting reference surface 203, and the distance between the wind turbine 5 and the wind turbine mounting reference surface 203 in the axial direction of the wind turbine 5 is h1, where 2 mm ≤ h1 ≤ 5 mm.

[0109] In this embodiment, the distance between the wind turbine 5 and the wind turbine mounting reference surface 203 in the axial direction of the wind turbine 5 is 2 mm to 5 mm, which can avoid the formation of turbulence between the wind turbine 5 and the support 2 and ensure that the wind generated by the wind turbine 5 flows out smoothly.

[0110] In one specific embodiment, the distance between the wind turbine 5 and the wind turbine mounting reference surface 203 in the axial direction of the wind turbine 5 is 2 mm.

[0111] In one specific embodiment, the distance between the wind turbine 5 and the wind turbine mounting reference surface 203 in the axial direction of the wind turbine 5 is 4 mm.

[0112] In one specific embodiment, the distance between the wind turbine 5 and the wind turbine mounting reference surface 203 in the axial direction of the wind turbine 5 is 5 mm.

[0113] In one specific embodiment, the wind turbine mounting reference surface 203 is the side of the bracket 2.

[0114] In one specific embodiment, the bracket 2 is equipped with a motor, which is connected to the wind turbine 5 and can drive the wind turbine 5 to rotate.

[0115] In one embodiment, the air inlet screen 601 is a spherical surface protruding in a direction away from the impeller 5. The impeller 5 includes blades with a highest position near the air inlet screen 601 and a lowest position away from the air inlet screen 601. The minimum distance between the highest position and the air inlet screen 601 is h2, and the maximum distance between the highest position and the air inlet screen 601 is h3, where h2 ≥ 10 mm and / or h3 ≥ 15 mm and / or the distance between the lowest position and the air guide wall 102 is h4, where h4 ≥ 0 mm.

[0116] In this embodiment, the minimum distance between the highest position and the air inlet screen 601 is h2, and the maximum distance between the highest position and the air inlet screen 601 is h3, where h2 ≥ 10 mm and / or h3 ≥ 15 mm. This avoids local turbulence caused by an excessively small distance between the air inlet screen 601 and the impeller 5. The distance between the lowest position and the guide wall 102 is h4, where h4 ≥ 0 mm. This avoids increasing local resistance and causing turbulence.

[0117] In a preferred embodiment, h2≥10mm, h3≥15mm, and the distance between the lowest position and the air guide wall 102 is h4, h4≥0mm.

[0118] In one embodiment, the air outlet device is a heater.

[0119] In one embodiment, the air outlet device further includes a heating element, which is disposed on the bracket 2 and located at the outlet of the air outlet duct.

[0120] In this embodiment, when the impeller 5 is working, the airflow passes through the air inlet mesh 601 at the center of the rear mesh 6 and enters the interior of the air outlet device. The guide wall 102 can smoothly guide the airflow to the impeller 5, which can effectively reduce wind resistance, noise, and energy loss. Since the annular air duct 3 surrounds the impeller 5, under the action of the impeller 5, the airflow enters the annular air duct 3 and flows along the annular air duct 3. As the distance between the first air wall 101 and the second air wall 201 gradually decreases, the local turbulent kinetic energy of the wall surface can be reduced, the wind force can be concentrated, the airflow can be effectively guided, the flow loss in the air duct can be reduced, and the airflow can be pressurized and accelerated, increasing the air volume, wind speed, and air delivery distance. When the airflow flows out from the air outlet duct, it is heated to form hot air, thereby expanding the coverage area of ​​the hot air blowing.

[0121] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by this application.

Claims

1. An air outlet duct, characterized in that, include: The first wind wall (101) has an air inlet end connected to a guide wall (102), which is adapted to surround the wind wheel (5); The second wind wall (201) is arranged opposite to the first wind wall (101). The guide wall (102) extends toward the second wind wall (201) and forms an air inlet gap with the second wind wall (201). An annular air duct (3) is formed between the second wind wall (201) and the first wind wall (101). The annular air duct (3) is adapted to surround the wind wheel (5). Along the flow direction of the airflow, the distance between the first wind wall (101) and the second wind wall (201) gradually decreases.

2. The air outlet duct according to claim 1, characterized in that, The wall surface of the air guide wall (102) is streamlined, or the inner diameter of the air guide wall (102) gradually increases or decreases along the direction of airflow.

3. The air outlet duct according to claim 1, characterized in that, The wind guide wall (102) is connected to the first wind wall (101) by an arc segment with a radius of R, where R > 2 mm.

4. The air outlet duct according to claim 1, characterized in that, The distance between the air guide wall (102) and the second air wall (201) is h, where h ≥ 20 mm.

5. The air outlet duct according to any one of claims 1 to 4, characterized in that, The first wind wall (101) and the second wind wall (201) are designed asymmetrically.

6. The air outlet duct according to claim 5, characterized in that, The first wind wall (101) is streamlined or straight, and the second wind wall (201) is straight.

7. The air outlet duct according to claim 6, characterized in that, The second wind wall (201) extends in the radial direction of the wind turbine (5).

8. The air outlet duct according to claim 6, characterized in that, Draw a tangent to the first wind wall (101) through the air inlet end of the first wind wall (101), and the angle between the tangent and the second wind wall (201) is α, where 0°<α≤35°.

9. The air outlet duct according to claim 8, characterized in that, 5°≤α≤20°。 10. The air outlet duct according to any one of claims 1 to 4, 6 to 9, characterized in that, Along the direction of airflow, the first wind wall (101) is connected to a first guide surface (103), which extends along the axial direction of the impeller (5). The second wind wall (201) is connected to a second guide surface (202), which cooperates with the first wind wall (101) to guide the airflow from radial flow along the impeller (5) to axial flow towards the impeller (5).

11. The air outlet duct according to claim 10, characterized in that, The maximum distance between the first wind wall (101) and the second wind wall (201) is R1, the distance between the connection point of the second wind wall (201) and the second guide surface (202) and the first wind wall (101) is R2, and the distance between the end of the second guide surface (202) and the first guide surface (103) is R3, where R1 > R2 and / or R2 ≥ R3.

12. An air outlet device, characterized in that, include: The wind turbine (5) and the air outlet duct according to any one of claims 1 to 11, wherein the annular air duct (3) surrounds the wind turbine (5).

13. The air outlet device according to claim 12, characterized in that, The distance between the wind turbine (5) and the wind guide wall (102) is d, 3 mm ≤ d ≤ 6 mm.

14. The air outlet device according to claim 12, characterized in that, The air outlet device includes: The support (2) has a second wind wall (201) and the wind wheel (5) is located on the inner side of the wind guide wall (102); The wind wall structure (1) has the first wind wall (101) formed thereon; The rear net (6) is connected to the side of the wind wall structure (1) away from the support (2). An air inlet cover (601) is provided at the center of the rear net (6), and the air inlet cover (601) is opposite to the wind wheel (5).

15. The air outlet device according to claim 14, characterized in that, The bracket (2) is provided with a wind turbine mounting reference surface (203). The distance between the wind turbine (5) and the wind turbine mounting reference surface (203) on the axial direction of the wind turbine (5) is h1, where 2 mm ≤ h1 ≤ 5 mm.

16. The air outlet device according to claim 14, characterized in that, The air inlet screen (601) is a spherical surface protruding in a direction away from the impeller (5). The impeller (5) includes blades. The blades have a highest position close to the air inlet screen (601) and a lowest position away from the air inlet screen (601). The minimum distance between the highest position and the air inlet screen (601) is h2, and the maximum distance between the highest position and the air inlet screen (601) is h3, where h2 ≥ 10 mm and / or h3 ≥ 15 mm and / or the distance between the lowest position and the air guide wall (102) is h4, where h4 ≥ 0 mm.

17. The air outlet device according to any one of claims 12 to 16, characterized in that, The air outlet device is a heater.

18. The air outlet device according to any one of claims 14 to 16, characterized in that, The air outlet device also includes a heating element, which is disposed on the bracket (2) and located at the outlet of the air outlet duct.

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