Air outlet air duct and air outlet device

Abstract

The utility model relates to the technical field of household appliances discloses air outlet air duct and air outlet device, air outlet air duct includes: first wind wall, second wind wall is opposite to first wind wall setting, the annular air duct is formed between second wind wall and first wind wall, the annular air duct is suitable for surrounding wind wheel and extends along the radial direction of wind wheel, the import of annular air duct is located at the inner circumferential side of annular air duct, along the flow direction of airflow, the spacing between first wind wall and second wind wall gradually increases first and then gradually reduces. The utility model can reduce the local turbulent kinetic energy of wall surface, improve the wind power concentration, effectively guide the airflow, reduce the flow loss in the air duct, and can realize pressure boost acceleration, improve the air volume, air speed and air supply distance, so as to can expand the blowing coverage area.

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 of related heating devices.

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

[0005] First wind barrier;

[0006] The second wind wall is disposed opposite to the first wind wall, and 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 and extend in the radial direction of the wind wheel. The inlet of the annular air duct is located on the inner circumference of the annular air duct. Along the flow direction of the airflow, the distance between the first wind wall and the second wind wall gradually increases and then gradually decreases.

[0007] Beneficial effects: Since the annular air duct surrounds the impeller and extends along the radial direction of the impeller, and the inlet of the annular air duct is located on the inner circumference of the annular air duct, under the action of the impeller, the airflow enters the annular air duct and flows along the annular air duct. Since the distance between the first wind wall and the second wind wall gradually increases and then 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 pressurization and acceleration can be achieved to increase the air volume, wind speed and air delivery distance, thereby expanding the blowing coverage area.

[0008] In one alternative implementation, the first air wall is streamlined or straight, and the second air wall is streamlined.

[0009] 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.

[0010] In one alternative implementation, along the direction of airflow, the second wind wall first extends away from the first wind wall and then extends closer to the first wind wall.

[0011] Beneficial effects: Along the direction of airflow, the second wind wall initially extends away from the first wind wall, so the distance between the first and second wind walls gradually increases, ensuring that the airflow after passing the impeller can smoothly enter the annular air duct, reducing noise. The second wind wall then extends closer to the first wind wall, and the distance between the first and second wind walls gradually decreases, which can achieve pressurization and acceleration, increase air volume, air speed and air delivery distance, thereby expanding the blowing coverage area and allowing the airflow to flow closely along the second wind wall, reducing the formation of wall turbulence.

[0012] In one optional embodiment, the air outlet duct further includes a guide surface that runs parallel to the second air wall along the airflow direction, and an air outlet guide gap is formed between the first air wall and the guide surface. The guide surface is straight or curved.

[0013] Beneficial effects: The air outlet gap formed between the second wind wall and the guide surface can further pressurize and accelerate the airflow, increase the air volume, wind speed and air delivery distance, thereby expanding the blowing coverage area.

[0014] In one optional embodiment, the distance between the connection point of the second wind wall and the guide surface and the first wind wall is R1, the maximum distance between the second wind wall and the first wind wall is R2, and the distance between the second wind wall and the first wind wall at the inlet of the annular air duct is R3, where R2 > 1.3R1 and / or R3 > R1.

[0015] Beneficial effects: The distance between the connection point of the second wind wall and the guide surface and the first wind wall is R1, the maximum distance between the second wind wall and the first wind wall is R2, and the distance between the second wind wall and the first wind wall at the inlet of the annular air duct is R3. R2 > 1.3R1 and / or R3 > R1 can ensure that the airflow after passing through the impeller can smoothly enter the annular air duct, and can achieve pressurization and acceleration, increase air volume, air speed and air delivery distance, thereby expanding the blowing coverage area, and can make the airflow closely follow the first wind wall and the second wind wall, reducing the formation of wall turbulence.

[0016] In one alternative embodiment, along the airflow direction, the first wind wall is connected to a first outlet surface, the guide surface is connected to a second outlet surface, the first outlet surface and the second outlet surface extend in a direction parallel to the axial direction of the impeller, and an air outlet channel is formed between the first outlet surface and the second outlet surface.

[0017] Beneficial effects: Along the direction of airflow, the first wind wall is connected to the first outlet surface, and the guide surface is connected to the second outlet surface. The first outlet surface and the second outlet surface extend in a direction parallel to the axis of the impeller. An air outlet channel is formed between the first outlet surface and the second outlet surface, which can further increase the wind speed, thereby increasing the air delivery distance and expanding the blowing coverage area.

[0018] In one optional embodiment, the distance between the connection point of the second wind wall and the guide surface and the first wind wall is R1, the distance between the connection point of the guide surface and the second outlet surface and the first wind wall is R4, and the distance between the first outlet surface and the second outlet surface is R5, where R1≥R4 and / or R4≥R5.

[0019] Beneficial effects: The distance between the connection between the guide surface and the second outlet surface and the first wind wall is R4, and the distance between the first outlet surface and the second outlet surface is R5. R1≥R4 and / or R4≥R5, the air outlet channel formed between the first outlet surface and the second outlet surface can increase the wind speed, thereby increasing the air delivery distance and expanding the blowing coverage area.

[0020] In one optional embodiment, a first tangent line to the first wind wall is drawn at the position where the distance between the second wind wall and the first wind wall is the greatest, and a second tangent line to the second wind wall is drawn at the position where the distance between the first wind wall and the second wind wall is the greatest. The angle between the first tangent line and the second tangent line is α, where 0° < α < 35°.

[0021] Beneficial effect: The angle between the first tangent and the second tangent is less than 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] Secondly, this utility model also provides an air outlet device, comprising:

[0024] The wind turbine and the air outlet duct, wherein the annular air outlet duct surrounds the wind turbine.

[0025] Beneficial effects: This air outlet device, because the annular air duct surrounds the impeller and extends in the radial direction of the impeller, and the inlet of the annular air duct is located on the inner circumference of the annular air duct, the airflow enters the annular air duct under the action of the impeller and flows along the annular air duct. Since the distance between the first wind wall and the second wind wall gradually increases and then 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.

[0026] In one optional embodiment, the air outlet device includes:

[0027] A support frame having a second wind wall, wherein the wind turbine is disposed on the support frame;

[0028] The rear net is connected to the bracket, and the rear net forms the first wind wall. An air inlet is provided at the center of the rear net, and the air inlet is arranged opposite to the wind wheel.

[0029] Beneficial effects: When the impeller is working, the airflow passes through the air inlet on the rear mesh and enters the air outlet device. Then it enters the annular air duct radially and flows along the annular air duct. Since the distance between the first and second air walls gradually increases and then 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 to increase the air volume, wind speed and air delivery distance, thereby expanding the blowing coverage area.

[0030] In one optional embodiment, the bracket is provided with a wind turbine mounting reference surface, and the axial distance between the end of the wind turbine near the bracket and the wind turbine mounting reference surface is 2-5mm.

[0031] Beneficial effects: The axial distance between the end of the wind turbine near the support and the wind turbine mounting reference surface is 2-5mm, which can avoid turbulence between the wind turbine and the support and ensure that the wind generated by the wind turbine flows out smoothly.

[0032] 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.

[0033] Beneficial effects: The heating element is mounted on the bracket and located at the outlet of the air duct. When the impeller is working, the airflow passes through the air inlet on the rear mesh and enters the interior of the air outlet device. Then, it enters the interior of the annular air duct radially and flows along the annular air duct. Since the distance between the first and second air walls gradually increases and then gradually decreases, the local turbulent kinetic energy of the wall surface can be reduced, the air force concentration can be improved, the airflow can be effectively guided, the flow loss in the air duct can be reduced, and the airflow can be pressurized and accelerated to increase the air volume, air speed and air delivery distance. When the airflow flows out of the air outlet duct, it is heated by the heating element to form hot air. Since the air speed of the hot air is high, the coverage area of ​​the hot air can be expanded.

[0034] In one optional embodiment, along the airflow direction, the first wind wall is connected to a first outlet surface, the second wind wall is connected to a guide surface, and the guide surface is connected to a second outlet surface. The first outlet surface and the second outlet surface extend in a direction parallel to the axial direction of the impeller, and an air outlet channel is formed between the first outlet surface and the second outlet surface. The guide surface, the first outlet surface, and the second outlet surface are all formed on the support. The support also forms an air outlet portion connected to the air outlet channel, and the heating element is disposed on the air outlet portion.

[0035] Beneficial effects: When the impeller is working, the airflow passes through the air inlet on the rear mesh and enters the air outlet device. Then it enters the annular air duct radially and flows along the annular air duct. After passing through the air outlet guide gap between the first air wall and the guide surface, it enters the air outlet channel between the first and second outlet surfaces. Then it passes through the air outlet section. During the process of passing through the air outlet section, it is heated by the heating element to form hot air. Since the airflow flows through the annular air duct, the air outlet guide gap and the air outlet channel in sequence, the wind speed is high when it reaches the air outlet section, which can expand the coverage area of ​​the hot air.

[0036] In one alternative embodiment, the bracket is integrally formed with an air outlet grille, which is opposite to the air outlet portion.

[0037] Beneficial effects: The air vent grille can hide the heating element inside, making it aesthetically pleasing and preventing burns caused by touching the heating element.

[0038] In one alternative implementation, the air outlet device is a heater. Attached Figure Description

[0039] 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.

[0040] Figure 1 This is a schematic diagram of an air outlet duct according to an embodiment of the present utility model;

[0041] Figure 2 This is a schematic diagram of an air outlet device according to an embodiment of the present utility model;

[0042] Figure 3 This is an exploded view of an air outlet device according to an embodiment of the present utility model;

[0043] Figure 4 This is a cross-sectional view of an air outlet device according to an embodiment of the present utility model;

[0044] Figure 5 This is an exploded cross-sectional view of an air outlet device according to an embodiment of the present utility model;

[0045] Figure 6 This is a sectional view of the rear grille and bracket after assembly.

[0046] Figure 7 A cross-sectional view of the rear net, support frame, and wind turbine assembled together;

[0047] Figure 8 This is a schematic diagram of the support structure.

[0048] Figure 9 This is the front view of the bracket;

[0049] Figure 10 This is a schematic diagram of the back net.

[0050] Explanation of reference numerals in the attached figures:

[0051] 1. Rear grille; 101. First air wall; 102. Air inlet; 2. Bracket; 201. Second air wall; 202. Guide surface; 203. First outlet surface; 204. Second outlet surface; 205. Mounting reference surface; 206. Air outlet; 207. Air outlet grille; L1. First tangent; L2. Second tangent; 3. Fan wheel; 4. Motor; 5. Heating element; 6. Display screen; 7. Base; 8. Support rod. Detailed Implementation

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] The following is combined Figures 1 to 10 The following describes embodiments of the present invention.

[0058] 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.

[0059] The second wind wall 201 is arranged opposite to the first wind wall 101, and an annular wind channel is formed between the second wind wall 201 and the first wind wall 101. The annular wind channel is suitable for surrounding the wind turbine 3 and extending in the radial direction of the wind turbine 3. The inlet of the annular wind channel is located on the inner circumference of the annular wind channel. The distance between the first wind wall 101 and the second wind wall 201 gradually increases and then gradually decreases.

[0060] In this embodiment, since the annular air duct surrounds the impeller 3 and extends in the radial direction of the impeller 3, and the inlet of the annular air duct is located on the inner circumference of the annular air duct, under the action of the impeller 3, the airflow enters the annular air duct and flows along the annular air duct. Since the distance between the first wind wall 101 and the second wind wall 201 gradually increases and then gradually decreases, the local turbulent kinetic energy of the wall surface can be reduced, the wind force concentration can be improved, 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.

[0061] When the airflow blown out from the air outlet duct passes through the heating element 5, the heating element 5 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.

[0062] Specifically, the distance between the first wind wall 101 and the second wind wall 201 gradually increases first, which can ensure that the airflow after passing through the impeller 3 can smoothly enter the annular air duct and reduce noise. The distance between the first wind wall 101 and the second wind wall 201 gradually decreases later, which can achieve pressurization and acceleration, increase air volume, air speed and air delivery distance, thereby expanding the blowing coverage area.

[0063] In a preferred embodiment, the air duct formed by the first wind wall 101 and the second wind wall 201 is a biomimetic lotus flower shape. The shape of the first wind wall 101 and the second wind wall 201 is similar to the outline of lotus petals. 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.

[0064] In one embodiment, the first wind wall 101 is streamlined or straight, and the second wind wall 201 is streamlined.

[0065] 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, 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.

[0066] In one specific embodiment, both the first wind wall 101 and the second wind wall 201 are streamlined, and the first wind wall 101 and the second wind wall 201 are asymmetrically designed.

[0067] In a preferred embodiment, the second wind wall 201 is arc-shaped.

[0068] In one embodiment, along the direction of airflow, the second wind wall 201 first extends away from the first wind wall 101, and then extends towards the first wind wall 101.

[0069] In this embodiment, along the airflow direction, the second wind wall 201 first extends away from the first wind wall 101, so the distance between the first wind wall 101 and the second wind wall 201 gradually increases, which can ensure that the airflow after passing through the impeller 3 can smoothly enter the annular air duct and reduce noise. The second wind wall 201 then extends closer to the first wind wall 101, and the distance between the first wind wall 101 and the second wind wall 201 gradually decreases, which can achieve pressurization and acceleration, increase air volume, air speed and air delivery distance, thereby expanding the blowing coverage area and making the airflow flow closely along the second wind wall 201, reducing the formation of wall turbulence.

[0070] In one specific embodiment, the second air wall 201 is formed on the bracket 2, and the second air wall 201 has a recessed design on the surface of the bracket 2.

[0071] In one embodiment, the air outlet duct further includes a guide surface 202, which is connected to the second air wall 201 along the airflow direction. An air outlet guide gap is formed between the first air wall 101 and the guide surface 202. The guide surface 202 is straight or curved.

[0072] In this embodiment, an air outlet guide gap is formed between the second wind wall 201 and the guide surface 202, which can further pressurize and accelerate the airflow, increase the air volume, wind speed and air delivery distance, thereby expanding the blowing coverage area.

[0073] In a preferred embodiment, the guide surface 202 is arc-shaped, which can guide the airflow and reduce turbulence formation.

[0074] In one specific embodiment, the flow guiding surface 202 is formed on the bracket 2, and the flow guiding surface 202 is designed to protrude from the surface of the bracket 2.

[0075] In one embodiment, the distance between the connection point of the second wind wall 201 and the guide surface 202 and the first wind wall 101 is R1, the maximum distance between the second wind wall 201 and the first wind wall 101 is R2, and the distance between the second wind wall 201 and the first wind wall 101 at the inlet of the annular air duct is R3, where R2 > 1.3R1 and / or R3 > R1.

[0076] In this embodiment, the distance between the connection point of the second wind wall 201 and the guide surface 202 and the first wind wall 101 is R1, the maximum distance between the second wind wall 201 and the first wind wall 101 is R2, and the distance between the second wind wall 201 and the first wind wall 101 at the inlet of the annular air duct is R3. R2 > 1.3R1 and / or R3 > R1, which can ensure that the airflow after passing through the impeller 3 can smoothly enter the annular air duct, and can achieve pressurization and acceleration, increase air volume, air speed and air delivery distance, thereby expanding the blowing coverage area, and can make the airflow flow closely along the first wind wall 101 and the second wind wall 201, reducing the formation of wall turbulence.

[0077] In a preferred embodiment, R2 > 1.3R1, and R3 > R1.

[0078] In one specific embodiment, R1 = 16 mm, R2 = 26 mm, R2 = 1.63R1, and R3 = 22 mm.

[0079] In one embodiment, along the flow direction of the airflow, the first air wall 101 is connected to the first outlet surface 203, the guide surface 202 is connected to the second outlet surface 204, the first outlet surface 203 and the second outlet surface 204 extend in the axial direction, and an air outlet channel is formed between the first outlet surface 203 and the second outlet surface 204.

[0080] In this embodiment, along the airflow direction, the first wind wall 101 is connected to the first outlet surface 203, and the guide surface 202 is connected to the second outlet surface 204. The first outlet surface 203 and the second outlet surface 204 extend in a direction parallel to the axial direction of the impeller 3. An air outlet channel is formed between the first outlet surface 203 and the second outlet surface 204, which can further increase the wind speed, thereby increasing the air delivery distance and expanding the blowing coverage area.

[0081] Since the first outlet surface 203 and the second outlet surface 204 extend in a direction parallel to the axis of the impeller 3, when the airflow blown out from the air outlet duct passes through the heating element 5, the heating element 5 heats the airflow to form hot air, which can improve the airflow concentration effect and quickly raise the temperature.

[0082] In one embodiment, the distance between the connection point of the second wind wall 201 and the guide surface 202 and the first wind wall 101 is R1, the distance between the connection point of the guide surface 202 and the second outlet surface 204 and the first wind wall 101 is R4, and the distance between the first outlet surface 203 and the second outlet surface 204 is R5, where R1≥R4 and / or R4≥R5.

[0083] In this embodiment, the distance between the connection between the guide surface 202 and the second outlet surface 204 and the first wind wall 101 is R4, and the distance between the first outlet surface 203 and the second outlet surface 204 is R5, where R1≥R4 and / or R4≥R5. The air outlet channel formed between the first outlet surface 203 and the second outlet surface 204 can increase the wind speed, thereby increasing the air delivery distance and expanding the blowing coverage area.

[0084] In a preferred embodiment, R1≥R4, R4≥R5.

[0085] In a preferred embodiment, R1 > R4, and the air outlet guide gap gradually decreases along the airflow direction.

[0086] In a preferred embodiment, R4 = R5, and the air outlet channel formed between the first outlet surface 203 and the second outlet surface 204 can play the role of concentrating air.

[0087] In one embodiment, a first tangent L1 of the first wind wall 101 is drawn at the position where the distance between the second wind wall 201 and the first wind wall 101 is the greatest, and a second tangent L2 of the second wind wall 201 is drawn at the position where the distance between the first wind wall 101 and the second wind wall 201 is the greatest. The angle between the first tangent L1 and the second tangent L2 is α, where 0° < α < 35°.

[0088] In this embodiment, the angle between the first tangent L1 and the second tangent L2 is less than 35°, which can reduce the space occupied by the air outlet duct in the axial direction.

[0089] In a preferred embodiment, 5°≤α≤20° can prevent excessive contraction of the first wind wall 101 and the second wind wall 201, which could lead to airflow separation and a surge in noise.

[0090] According to an embodiment of the present invention, another aspect provides an air outlet device, including a wind turbine 3 and an air outlet duct provided in the above embodiment, wherein the annular duct surrounds the wind turbine 3.

[0091] The air outlet device, because the annular air duct surrounds the impeller 3 and extends in the radial direction of the impeller 3, and the inlet of the annular air duct is located on the inner circumference of the annular air duct, under the action of the impeller 3, the airflow enters the annular air duct and flows along the annular air duct. Since the distance between the first wind wall 101 and the second wind wall 201 gradually increases and then 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.

[0092] In one embodiment, the air outlet device includes a bracket 2 and a rear screen 1. The bracket 2 forms a second air wall 201, and the impeller 3 is disposed on the bracket 2; the rear screen 1 is connected to the bracket 2, and the rear screen 1 forms a first air wall 101. An air inlet 102 is provided at the center of the rear screen 1, and the air inlet 102 is disposed opposite to the impeller 3.

[0093] In this embodiment, when the impeller 3 is working, the airflow passes through the air inlet 102 on the rear mesh 1 and enters the interior of the air outlet device. Then, it enters the interior of the annular air duct radially and flows along the annular air duct. Since the distance between the first wind wall 101 and the second wind wall 201 gradually increases and then 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 to increase the air volume, wind speed and air delivery distance, thereby expanding the blowing coverage area.

[0094] In one specific embodiment, the guide surface 202, the first outlet surface 203, and the second outlet surface 204 are all formed on the support 2, and the guide surface 202, the first outlet surface 203, and the second outlet surface 204 are integrally formed with the support 2.

[0095] In one specific embodiment, the wind turbine 3 is a centrifugal wind turbine or an axial flow wind turbine.

[0096] In one embodiment, the bracket 2 is provided with a wind turbine mounting reference surface 205, and the axial distance between the end of the wind turbine 3 near the bracket 2 and the wind turbine mounting reference surface 205 is 2-5mm.

[0097] In this embodiment, the axial distance between the end of the impeller 3 near the support 2 and the impeller mounting reference surface 205 is 2-5mm, which can avoid turbulence between the impeller 3 and the support 2 and ensure that the wind generated by the impeller 3 flows out smoothly.

[0098] In one specific embodiment, the axial distance between the end of the wind turbine 3 near the support 2 and the wind turbine mounting reference surface 205 is 2mm.

[0099] In one specific embodiment, the axial distance between the end of the wind turbine 3 near the support 2 and the wind turbine mounting reference surface 205 is 4mm.

[0100] In one specific embodiment, the axial distance between the end of the wind turbine 3 near the support 2 and the wind turbine mounting reference surface 205 is 5mm.

[0101] In one specific embodiment, the wind turbine mounting reference surface 205 is the side of the bracket 2.

[0102] In one specific embodiment, the bracket 2 is equipped with a motor 4, which is connected to the impeller 3 and can drive the impeller 3 to rotate.

[0103] In one embodiment, the air outlet device further includes a heating element 5, which is disposed on the bracket 2 and located at the outlet of the air outlet duct.

[0104] In this embodiment, the heating element 5 is disposed on the bracket 2 and located at the outlet of the air duct. When the impeller 3 is working, the airflow passes through the air inlet 102 on the rear mesh 1 and enters the interior of the air outlet device. Then it enters the interior of the annular air duct radially and flows along the annular air duct. Since the distance between the first wind wall 101 and the second wind wall 201 gradually increases and then gradually decreases, the local turbulent kinetic energy of the wall surface can be reduced, the wind force concentration can be improved, the airflow can be effectively guided, the flow loss in the air duct can be reduced, and the airflow can be pressurized and accelerated to increase the air volume, wind speed and air delivery distance. When the airflow flows out of the air outlet duct, it is heated by the heating element 5 to form hot air. Since the wind speed of the hot air is high, the coverage area of ​​the hot air can be expanded.

[0105] In one embodiment, along the airflow direction, the first wind wall 101 is connected to the first outlet surface 203, the second wind wall 201 is connected to the guide surface 202, the guide surface 202 is connected to the second outlet surface 204, the first outlet surface 203 and the second outlet surface 204 extend in a direction parallel to the axial direction of the impeller 3, and an air outlet channel is formed between the first outlet surface 203 and the second outlet surface 204. The guide surface 202, the first outlet surface 203 and the second outlet surface 204 are all formed on the support 2, and the support 2 also forms an air outlet portion 206 connected to the air outlet channel. The heating element 5 is disposed on the air outlet portion 206.

[0106] In this embodiment, when the impeller 3 is working, the airflow passes through the air inlet 102 on the rear mesh 1 and enters the interior of the air outlet device. Then, it enters the interior of the annular air duct radially and flows along the annular air duct. After passing through the air outlet guide gap between the first air wall 101 and the guide surface 202, it enters the air outlet channel between the first outlet surface 203 and the second outlet surface 204. Then, it passes through the air outlet 206. During the process of passing through the air outlet 206, it is heated by the heating element 5 to form hot air. Since the airflow flows through the annular air duct, the air outlet guide gap and the air outlet channel in sequence, the wind speed is high when it flows to the air outlet 206, which can expand the coverage area of ​​the hot air.

[0107] In one embodiment, such as Figures 3 to 5 As shown, the air outlet device also includes a display screen 6, which is located on the side of the bracket 2 away from the rear mesh 1. Users can adjust the speed and hot / cold air mode of the impeller 3 through the display screen 6.

[0108] In one embodiment, such as Figure 5 As shown, the air outlet device also includes a base 7 and a support rod 8. The support rod 8 is fixed to the base 7, and the bracket 2 is mounted on the support rod 8.

[0109] In one embodiment, the bracket 2 is integrally formed with an air outlet grille 207, which corresponds to the air outlet 206. The air outlet grille 207 can hide the heating element 5 inside, making it aesthetically pleasing and preventing people from touching the heating element 5 and causing burns.

[0110] In one specific embodiment, the air outlet device is a heater.

[0111] 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: First Wind Wall (101); The second wind wall (201) is arranged opposite to the first wind wall (101). An annular air duct is formed between the second wind wall (201) and the first wind wall (101). The annular air duct is adapted to surround the wind wheel (3) and extend in the radial direction of the wind wheel (3). The inlet of the annular air duct is located on the inner circumference of the annular air duct. Along the flow direction of the airflow, the distance between the first wind wall (101) and the second wind wall (201) gradually increases and then gradually decreases.

2. The air outlet duct according to claim 1, characterized in that, The first wind wall (101) is streamlined or straight, and the second wind wall (201) is streamlined.

3. The air outlet duct according to claim 1, characterized in that, Along the direction of airflow, the second wind wall (201) first extends away from the first wind wall (101), and then extends closer to the first wind wall (101).

4. The air outlet duct according to any one of claims 1 to 3, characterized in that, The air outlet duct also includes a guide surface (202), which is connected to the second air wall (201) along the airflow direction. An air outlet guide gap is formed between the first air wall (101) and the guide surface (202). The guide surface (202) is straight or curved.

5. The air outlet duct according to claim 4, characterized in that, The distance between the connection point of the second wind wall (201) and the guide surface (202) and the first wind wall (101) is R1, the maximum distance between the second wind wall (201) and the first wind wall (101) is R2, and the distance between the second wind wall (201) and the first wind wall (101) at the inlet of the annular air duct is R3, where R2 > 1.3R1 and / or R3 > R1.

6. The air outlet duct according to claim 4, characterized in that, Along the direction of airflow, the first wind wall (101) is connected to a first outlet surface (203), and the guide surface (202) is connected to a second outlet surface (204). The first outlet surface (203) and the second outlet surface (204) extend in a direction parallel to the axial direction of the impeller (3), and an air outlet channel is formed between the first outlet surface (203) and the second outlet surface (204).

7. The air outlet duct according to claim 6, characterized in that, The distance between the connection point of the second wind wall (201) and the guide surface (202) and the first wind wall (101) is R1, the distance between the connection point of the guide surface (202) and the second outlet surface (204) and the first wind wall (101) is R4, the distance between the first outlet surface (203) and the second outlet surface (204) is R5, and R1≥R4 and / or R4≥R5.

8. The air outlet duct according to claim 5, characterized in that, Draw a first tangent (L1) to the first wind wall (101) at the position where the distance between the second wind wall (201) and the first wind wall (101) is the greatest. Draw a second tangent (L2) to the second wind wall (201) at the position where the distance between the first wind wall (101) and the second wind wall (201) is the greatest. The angle between the first tangent (L1) and the second tangent (L2) is α, where 0° < α < 35°.

9. The air outlet duct according to claim 8, characterized in that, 5°≤α≤20°。 10. An air outlet device, characterized in that, include: The wind turbine (3) and the air outlet duct according to any one of claims 1 to 9, the annular duct surrounding the wind turbine (3).

11. The air outlet device according to claim 10, characterized in that, The air outlet device includes: The support (2) has the second wind wall (201) formed thereon, and the wind turbine (3) is disposed on the support (2); The rear net (1) is connected to the bracket (2). The rear net (1) forms the first wind wall (101). An air inlet (102) is provided at the center of the rear net (1). The air inlet (102) is arranged opposite to the wind wheel (3).

12. The air outlet device according to claim 11, characterized in that, The bracket (2) is provided with a wind turbine mounting reference surface (205), and the axial distance between the end of the wind turbine (3) near the bracket (2) and the wind turbine mounting reference surface (205) is 2-5mm.

13. The air outlet device according to claim 11, characterized in that, The air outlet device also includes a heating element (5), which is disposed on the bracket (2) and located at the outlet of the air outlet duct.

14. The air outlet device according to claim 13, characterized in that, Along the airflow direction, the first wind wall (101) is connected to a first outlet surface (203), the second wind wall (201) is connected to a guide surface (202), the guide surface (202) is connected to a second outlet surface (204), the first outlet surface (203) and the second outlet surface (204) extend in a direction parallel to the axial direction of the impeller (3), and an air outlet channel is formed between the first outlet surface (203) and the second outlet surface (204). The guide surface (202), the first outlet surface (203) and the second outlet surface (204) are all formed on the support (2), and the support (2) also forms an air outlet part (206) connected to the air outlet channel. The heating element (5) is disposed on the air outlet part (206).

15. The air outlet device according to claim 14, characterized in that, The bracket (2) is integrally formed with an air outlet grille (207), which is opposite to the air outlet part (206).

16. The air outlet device according to any one of claims 10 to 15, characterized in that, The air outlet device is a heater.

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