Crossflow duct and fan

Abstract

The present invention relates to the field of fan technology, and particularly to a cross-flow air duct and a fan, the cross-flow air duct comprising: a volute, the volute comprising a first body, the first side of the first body being an air inlet side, the second side of the first body being an air outlet side, the second side of the first body being provided with a plurality of first air guide plates spaced apart along the axial direction of the volute; a volute tongue, spaced apart from the volute, the volute tongue comprising a second body, the first side of the second body being an air inlet side, the second side of the second body being an air outlet side, an installation space suitable for installing a wind wheel being formed between the first body and the second body, an air inlet being formed between the first side of the first body and the first side of the second body, an air outlet being formed between the second side of the first body and the second side of the second body, the second side of the second body being provided with a plurality of second air guide plates spaced apart along the axial direction of the volute, the first air guide plates and the second air guide plates being staggered in the axial direction of the volute.

Description

Technical Field

[0001] The present invention relates to the technical field of fans, and in particular to a cross-flow air duct and a fan. Background Art

[0002] With the improvement of living standards, people's demand for fan functions and performance diversity has also increased, and fans that can bring a comfortable experience are more preferred. The tower fans currently on the market have a slender appearance, small footprint, no exposed blades, and a higher safety factor; their multi-blade cross-flow impellers are combined with long-stroke air ducts to evenly cut the wind up and down, and provide good air supply continuity. However, due to the tower shape and the smaller impeller diameter, the corresponding air outlet is narrow, and the cross-flow duct volute mostly adopts an Archimedean spiral or logarithmic spiral design. The fluid is delivered along the tangential direction formed by the spiral, and the wind pressure at the position close to the volute line will be higher than the wind pressure at the position far from the volute, resulting in a difference in wind speed at the position close to the volute and the wind speed far from the volute, that is, the wind speed on the left and right sides of the air outlet is uneven, and due to the limited air outlet area, the air supply range is narrow, resulting in poor uniformity of the user's body surface temperature. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the narrow air supply range of the cross-flow air duct in the prior art, thereby providing a cross-flow air duct and a fan that can increase the air supply range.

[0004] In order to solve the above technical problems, the present invention provides a cross-flow air duct, comprising:

[0005] A volute, the volute comprising a first body, a first side of the first body being an air inlet side, a second side of the first body being an air outlet side, and a plurality of first air guide plates spaced apart along the axial direction of the volute being provided on the second side of the first body;

[0006] The volute tongue is spaced apart from the volute, and the volute tongue includes a second body, the first side of the second body is the air inlet side, the second side of the second body is the air outlet side, and an installation space suitable for installing a wind wheel is formed between the first body and the second body. An air inlet is formed between the first side of the first body and the first side of the second body, and an air outlet is formed between the second side of the first body and the second side of the second body. The second side of the second body is provided with a plurality of second wind guide plates spaced apart along the axial direction of the volute, and the first wind guide plates and the second wind guide plates are staggered in the axial direction of the volute.

[0007] Optionally, the first air guide plate includes a first plate body and a first air guide surface provided at an end of the first plate body and extending toward the outside of the installation space, and a second air guide surface is further provided on a second side of the first plate body, and the second air guide surface extends toward the outside of the installation space;

[0008] The second wind guide plate includes a second plate body and a third wind guide surface provided at the end of the second plate body and extending toward the outside of the installation space. A fourth wind guide surface is also provided on the second side of the second plate body, and the fourth wind guide surface extends toward the outside of the installation space.

[0009] Optionally, the central symmetric plane between the first wind guide surface and the second wind guide surface is defined as the first surface, the central symmetric plane between the third wind guide surface and the fourth wind guide surface is defined as the second surface, and the angle between the first surface and the second surface is θ, 0<θ≤40°.

[0010] Optionally, the central symmetry plane between the second side of the first body and the second side of the second body is defined as the misalignment reference plane, the first surface and the second surface are located on both sides of the misalignment reference plane, the angle between the first surface and the misalignment reference plane is θ1, the angle between the second surface and the misalignment reference plane is θ2, 0<θ1≤20°, and / or, 0<θ2≤20°.

[0011] Optionally, a plurality of third air guide plates are provided on the first side of the first body and are distributed at intervals along the axial direction of the volute.

[0012] Optionally, an air inlet guide surface is provided on the first side of the second body.

[0013] Optionally, the crossflow air duct further includes a wind wheel arranged in the installation space, and the diameter of the wind wheel is D.

[0014] Optionally, the cross section of the second body is an arc, and the axis of the second plate body is collinear with the axis of the wind wheel.

[0015] Optionally, the minimum radial distance between the second body and the wind wheel is A, 1D / 28≤A≤1D / 10.

[0016] Optionally, the position where the distance between the first body and the wind wheel is the smallest is the snail throat, and the distance between the snail throat and the wind wheel is B, 1D / 22≤B≤1D / 11.

[0017] Optionally, the wind wheel includes multiple wind wheel segments, and the distance between two adjacent first wind guide plates or two adjacent second wind guide plates is the length of N wind wheel segments, 1≤N≤3.

[0018] The present invention also provides a fan comprising the cross-flow air duct.

[0019] The technical solution of the present invention has the following advantages:

[0020] The cross-flow air duct provided by the present invention is provided with a plurality of first air guide plates distributed at intervals along the axial direction of the volute on the second side of the first body, and a plurality of second air guide plates distributed at intervals along the axial direction of the volute on the second side of the second body. The first air guide plates and the second air guide plates are staggered in the axial direction of the volute. The plurality of areas on the second side of the first body where the first air guide plates are not provided are opposite to the second air guide plates on the second side of the second body one by one, forming a plurality of first air outlet areas. The plurality of first air guide plates on the second side of the first body are opposite to the plurality of areas on the second side of the second body where the second air guide plates are not provided, forming a plurality of second air outlet areas. The side where the volute is located is defined as the left side, and the side where the volute tongue is located is defined as the right side. Then, the left side of the first air outlet area is biased to the left of the left side of the second air outlet area, and the right side of the second air outlet area is biased to the right of the right side of the first air outlet area. Therefore, the air outlet width is expanded as a whole, and the air supply range is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0022] Figure 1 This is a schematic structural diagram of the cross-flow air duct provided in Example 1 of the present invention;

[0023] Figure 2 for Figure 1 A schematic diagram of the structure at the air inlet side;

[0024] Figure 3 for Figure 2 The schematic diagram of the structure of the crossflow air duct shown is not provided with a wind wheel;

[0025] Figure 4 is a structural diagram of the volute;

[0026] Figure 5 It is a structural diagram of the snail tongue at one angle;

[0027] Figure 6 It is a structural diagram of the snail tongue at another angle;

[0028] Figure 7 for Figure 1 A top view of

[0029] Figure 8 for Figure 1 A schematic diagram of a structure in which a cross-flow air duct is provided with an air outlet grille;

[0030] Figure 9 for Figure 8 Schematic diagram of the structure of the wind wheel;

[0031] Figure 10 for Figure 8 Top view of .

[0032] Description of reference numerals:

[0033] 1. Volute; 101. First body; 102. First air guide plate; 1021. First plate body; 1022. First air guide surface; 103. Second air guide surface; 104. Third air guide plate; 105. Volute throat; 2. Volute tongue; 201. Second body; 202. Second air guide plate; 2021. Second plate body; 2022. Third air guide surface; 203. Fourth air guide surface; 204. Air inlet guide surface; 3. Wind wheel; 301. Wind wheel section; 4. Air outlet grille; 401. First grille section; 4011. First central symmetric plane; 402. Second grille section; 4021. Second central symmetric plane; 5. Offset reference plane; 6. First surface; 7. Second surface. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0037] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0038] Example 1

[0039] With the improvement of living standards, people's demand for fan functions and performance diversity has also increased, and fans that can bring a comfortable experience are more preferred. The tower fans currently on the market have a slender appearance, small footprint, no exposed blades, and a higher safety factor; their multi-blade cross-flow impellers are combined with long-stroke air ducts to evenly cut the wind up and down, and provide good air supply continuity. However, due to the tower shape and the smaller impeller diameter, the corresponding air outlet is narrow, and the cross-flow duct volute mostly adopts an Archimedean spiral or logarithmic spiral design. The fluid is delivered along the tangential direction formed by the spiral, and the wind pressure at the position close to the volute line will be higher than the wind pressure at the position far from the volute, resulting in a difference in wind speed at the position close to the volute and the wind speed far from the volute, that is, the wind speed on the left and right sides of the air outlet is uneven, and due to the limited air outlet area, the air supply range is narrow, resulting in poor uniformity of the user's body surface temperature.

[0040] For this reason, Figures 1 to 10 As shown, this embodiment provides a cross-flow air duct, which can increase the air supply range.

[0041] In one embodiment, Figure 1 As shown, the crossflow air duct includes a volute 1 and a volute tongue 2. The volute 1 includes a first body 101, wherein the first side of the first body 101 is the air inlet side, the second side of the first body 101 is the air outlet side, and the second side of the first body 101 is provided with a plurality of first air guide plates 102 spaced apart along the axial direction of the volute 1. The volute tongue 2 is spaced apart from the volute 1 and includes a second body 201, wherein the first side of the second body 201 is the air inlet side, and the second side of the second body 201 is the air outlet side. A mounting space suitable for mounting a wind wheel 3 is formed between the first body 101 and the second body 201. An air inlet is formed between the first side of the first body 101 and the first side of the second body 201, and an air outlet is formed between the second side of the first body 101 and the second side of the second body 201. The second side of the second body 201 is provided with a plurality of second air guide plates 202 spaced apart along the axial direction of the volute 1. The first air guide plates 102 and the second air guide plates 202 are staggered in the axial direction of the volute 1.

[0042] In this embodiment, a plurality of first air guide plates 102 are provided on the second side of the first body 101 and are distributed at intervals along the axial direction of the volute 1, and a plurality of second air guide plates 202 are provided on the second side of the second body 201 and are distributed at intervals along the axial direction of the volute 1, the first air guide plates 102 and the second air guide plates 202 are staggered in the axial direction of the volute 1, and a plurality of areas on the second side of the first body 101 where the first air guide plates 102 are not provided are opposite to the second air guide plates 202 on the second side of the second body 201 one by one, forming a plurality of first air outlet areas, and a plurality of first air guide plates 102 on the second side of the first body 101 are opposite to the plurality of areas on the second side of the second body 201 where the second air guide plates 202 are not provided, forming a plurality of second air outlet areas, defining the side where the volute 1 is located as the left side and the side where the volute tongue 2 is located as the right side, then the left side of the first air outlet area is biased to the left relative to the left side of the second air outlet area, and the right side of the second air outlet area is biased to the right relative to the right side of the first air outlet area, thereby expanding the air outlet width as a whole and improving the air supply range.

[0043] On the basis of the above embodiment, in a preferred embodiment, further reference is made to Figure 1 The first air guide plate 102 includes a first plate body 1021 and a first air guide surface 1022 disposed at an end of the first plate body 1021 and extending toward the outside of the installation space. A second air guide surface 103 is further disposed on a second side of the first plate body 1021, extending toward the outside of the installation space. The second air guide plate 202 includes a second plate body 2021 and a third air guide surface 2022 disposed at an end of the second plate body 2021 and extending toward the outside of the installation space. A fourth air guide surface 203 is further disposed on a second side of the second plate body 2021, extending toward the outside of the installation space. In this embodiment, the arrangement of the first air guide surface 1022, the second air guide surface 103, the third air guide surface 2022, and the fourth air guide surface 203 can guide the outlet direction of the air, ensuring that the air blows outward and avoiding airflow turbulence at the outlet. In an alternative embodiment, guide slopes may be provided on the end face of the first plate body 1021, the end face of the second plate body 2021, the second side of the first body 101, and the second side of the second body 201, respectively, to guide the air outlet direction.

[0044] Specifically in one embodiment, the first wind guide surface 1022 , the second wind guide surface 103 , the third wind guide surface 2022 , and the fourth wind guide surface 203 may be respectively extended outward along the radial direction of the wind wheel 3 .

[0045] On the basis of the above embodiment, in a preferred embodiment, as Figure 7As shown, the central symmetric plane between the first air guide surface 1022 and the second air guide surface 103 is defined as the first surface 6, and the central symmetric plane between the third air guide surface 2022 and the fourth air guide surface 203 is defined as the second surface 7. The angle between the first surface 6 and the second surface 7 is θ, and 0<θ≤40°. In this embodiment, the angle between the first surface 6 and the second surface 7 is also the offset angle between the first air outlet area and the second air outlet area. By limiting the offset angle between the first air outlet area and the second air outlet area, this embodiment can avoid the uneven distribution of air flow velocity and pressure inside the cross-flow duct due to excessive offset angle. This uneven airflow acts on the volute 2, volute 1 and impeller 3, causing the airflow pressure to pulsate over time. The airflow pulsation caused by the rotation of the impeller 3 blades will continuously and periodically impact the volute 2, volute 1 and other air duct features, increasing the peak value of the rotational noise. The greater the unevenness of the airflow, the stronger the noise. When the offset is too large, This will disrupt the flow continuity within the impeller 3 and produce a noticeable left-right deviation in the wind, affecting the air volume and air supply efficiency of the air duct. Therefore, this embodiment limits the offset angle between the first and second air outlet areas, thereby expanding the air outlet width and improving the air supply range without increasing noise or affecting the air volume of the air duct.

[0046] In a specific embodiment, θ is 40°. In some alternative embodiments, θ is 20° or 30°.

[0047] On the basis of the above-mentioned embodiment, in a preferred embodiment, the central symmetric plane between the second side of the first body 101 and the second side of the second body 201 is defined as the offset reference plane 5, the first surface 6 and the second surface 7 are located on both sides of the offset reference plane 5, the angle between the first surface 6 and the offset reference plane 5 is θ1, the angle between the second surface 7 and the offset reference plane 5 is θ2, 0<θ1≤20°, and / or, 0<θ2≤20°. Since the chord of the volute 1 of the cross-flow air duct is spirally arranged, the fluid at the outlet is ejected along the tangent of the original chord of the volute 1, so the wind speed in the extended section of the spiral near the back plate of the volute 1 will be higher than that far from the volute 1. If the offset angle of the first air outlet area and the second air outlet area is too large, the wind pressure gradient of the adjacent segment air duct will increase, thereby making the wind speed of the adjacent first air outlet area and the second air outlet area uneven, and the noise and sound quality will also be affected. Therefore, this embodiment limits the angle between the first surface 6 and the offset reference plane 5, and the angle between the second surface 7 and the offset reference plane 5, that is, the angle between the center of the first air outlet area and the offset reference plane 5, and the angle between the center of the second air outlet area and the offset reference plane 5. This can avoid uneven wind speeds in adjacent first and second air outlet areas without increasing noise and ensuring sound quality.

[0048] Based on the above embodiment, in a preferred embodiment, a plurality of third air guide plates 104 are provided on the first side of the first body 101 and are spaced apart along the axial direction of the volute 1. In this embodiment, the provision of the third air guide plates 104 can ensure the stability of the crossflow air duct.

[0049] Based on the above embodiment, in a preferred embodiment, an air inlet guide surface 204 is provided on the first side of the second body 201. When the fluid passes through the air inlet guide surface 204, there is a clear tendency to flow along the wall, which plays a role in rectification. At the same time, before the fluid flows into the cross-flow duct for the second time, the wind pressure at this location can be effectively reduced, so that the wind speed and pressure gradient of the flow field gradually become consistent, which can effectively reduce the whistling sound generated by the vortex at this location, thereby improving the sound quality. Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 As shown, the air inlet guide surface 204 is an inclined surface extending along the radial direction of the wind wheel 3.

[0050] Based on the above embodiment, in a preferred embodiment, the crossflow air duct further includes a wind wheel 3 disposed in the installation space, and the diameter of the wind wheel 3 is D. In this embodiment, the volute 1, the volute tongue 2 and the wind wheel 3 together form the crossflow air duct.

[0051] Based on the above embodiment, in a preferred embodiment, the cross section of the second body 201 is an arc, and the axis of the second body 201 is collinear with the axis of the wind wheel 3. In this embodiment, the volute tongue 2 can better guide the airflow and play the role of a diverter cone.

[0052] On the basis of the above embodiment, in a preferred embodiment, the minimum radial distance between the second body 201 and the wind wheel 3 is A, 1D / 28≤A≤1D / 10. The radial distance between the second body 201 and the wind wheel 3 is the gap between the volute tongue 2 and the wind wheel 3. The ratio of the gap between the volute tongue 2 and the wind wheel 3 to the diameter of the wind wheel 3 has a significant impact on the flow rate and efficiency, and has a certain impact on the cross-flow duct pressure. When the gap is large, the fan pressure decreases and the flow rate decreases. When the gap is reduced, the pressure increases and the flow rate increases, but the noise peak and sound quality will also deteriorate, and it will affect the subsequent cross-flow duct conversion and the safety regulations of the wind wheel 3. Therefore, this embodiment limits the minimum radial distance between the second body 201 and the wind wheel 3, which can ensure a certain pressure and flow without increasing noise or affecting the sound quality.

[0053] Based on the above embodiment, in a preferred embodiment, the position where the distance between the first body 101 and the wind wheel 3 is the smallest is the snail throat 105, and the distance between the snail throat 105 and the wind wheel 3 is B, 1D / 22≤B≤1D / 11. Increasing the distance between the wind wheel 3 and the volute 1 will lead to a decrease in air volume, and will cause the vortex area on the first side of the volute 1 to gradually increase, and the turbulent flow noise of the diversion will increase. If the distance between the snail throat 105 and the wind wheel 3 is too small, the unevenness of the airflow speed and pressure inside the wind wheel 3 will increase the pulsation force in the area around the volute 1, and increase the rotational noise. Therefore, this embodiment limits the distance between the snail throat 105 and the wind wheel 3, which can ensure the uniformity of the wind speed and pressure inside the wind wheel 3 and reduce noise.

[0054] On the basis of the above embodiment, in a preferred embodiment, as Figure 9 As shown, the wind wheel 3 includes multiple wind wheel segments 301. The distance between two adjacent first wind guide plates 102 or two adjacent second wind guide plates 202 is the length of N wind wheel segments 301, where 1≤N≤3. The distance between two adjacent first wind guide plates 102 or two adjacent second wind guide plates 202 is the height of a single-segment air duct, which is also the height of the offset segment. Due to the action of the volute 1 and the volute tongue 2, the crossflow air duct forms a vortex within the flow field of the wind wheel 3. When the vortex deviates from the center of the rotation axis of the wind wheel 3, crossflow occurs. If the height of a single-segment air duct is too low, the position of the eccentric vortex in the single segment cannot be stabilized, and a stable crossflow area cannot be formed within the wind wheel 3. The flow field between adjacent segments is turbulent, which will have a significant impact on the noise, sound quality, outlet wind speed, and flow rate of the entire machine. If the height of a single-segment air duct is too high, the flow field offset will increase, resulting in the air supply from adjacent segment air ducts not being able to converge at a long distance, resulting in a noticeable left-right deviation in the wind, affecting the user experience. This implementation scheme limits the height of a single-segment air duct, which can not only ensure uniform air outlet on the left and right sides, but also form a stable through-flow area inside the wind wheel 3, reduce noise, ensure sound quality, and ensure outlet wind speed and flow.

[0055] On the basis of the above embodiment, in a preferred embodiment, the crossflow air duct further includes an air outlet grille 4, which is arranged at the air outlet, and the air outlet grille 4 includes a first grille segment 401 and a second grille segment 402 staggered along the axial direction of the volute 1, and a plurality of the first grille segments 401 and the second grille segments 402 are provided, and the longitudinal central symmetry plane of the first grille segment 401 is close to the second side of the first body 101, and the longitudinal central symmetry plane of the second grille segment 402 is close to the second side of the second body 201. In this embodiment, by staggering the first grille segment 401 and the second grille segment 402, and with the longitudinal central symmetry plane of the first grille segment 401 close to the second side of the first body 101 and the longitudinal central symmetry plane of the second grille segment 402 close to the second side of the second body 201, the crossflow air duct is provided with a plurality of the first grille segments 401 and the second grille segment 402 staggered, and with the longitudinal central symmetry plane of the first grille segment 401 close to the second side of the first body 101 and the longitudinal central symmetry plane of the second grille segment 402 close to the second side of the second body 201, Figure 8The second side of the first body 101 is on the left, and the second side of the second body 201 is on the right. Therefore, it can effectively improve the problem of the narrow air supply range of the existing cross-flow air duct. While ensuring the upper and lower wind shear connection lines of the tower fan cross-flow air duct, it can achieve a wider range of air supply, thereby improving the wind feeling of the whole machine and enhancing the user's comfort experience.

[0056] On the basis of the above embodiment, in a preferred embodiment, as Figure 10 As shown, the longitudinal central symmetric plane of first grille segment 401 is defined as first central symmetric plane 4011, and the longitudinal central symmetric plane of second grille segment 402 is defined as second central symmetric plane 4021. The angle between first central symmetric plane 4011 and second central symmetric plane 4021 is β, where 0 < β ≤ 50°. The angle between first central symmetric plane 4011 and second central symmetric plane 4021 represents the offset angle between first grille segment 401 and second grille segment 402. Excessively large offset angles between first grille segment 401 and second grille segment 402 can lead to abnormal noise and airflow. Therefore, this embodiment limits the offset angle between first grille segment 401 and second grille segment 402, ensuring airflow while minimizing noise and maintaining a sufficient airflow range.

[0057] Based on the above embodiment, in a preferred embodiment, the central symmetric plane between the second side of the first body 101 and the second side of the second body 201 is defined as the offset reference plane 5. The angle between the first central symmetric plane 4011 and the offset reference plane 5 is β1, and the angle between the second central symmetric plane 4021 and the offset reference plane 5 is β2, where 0 < β1 ≤ 25° and 0 < β2 ≤ 25°. In this embodiment, the angle between the first central symmetric plane 4011 and the offset reference plane 5 is the angle at which the first grille segment 401 deflects to the left, and the angle between the second central symmetric plane 4021 and the offset reference plane 5 is the angle at which the second grille segment 402 deflects to the right. This embodiment further limits the deflection angles of the first and second grille segments 401, 402, ensuring airflow while minimizing noise and ensuring high airflow.

[0058] Based on the above embodiment, in a preferred embodiment, the length of the first grille segment 401 and / or the second grille segment 402 is C, and 1D / 9≤C≤1D / 4. If the length of the first grille segment 401 and the second grille segment 402 is too short, their air guiding effect will be weakened, and the outlet wind pressure will be insufficient, the wind speed will be reduced, and the air supply effect of the air duct will be affected; if the length of the first grille segment 401 and the second grille segment 402 is too long, the dynamic and static interference between the grille and the air supply fluid will increase, resulting in an increase in the noise peak. Therefore, this embodiment limits the length of the first grille segment 401 and the second grille segment 402, which can ensure the air supply effect without increasing noise. It should be noted that the length of the first grille segment 401 and the second grille segment 402 is the length along the air outlet direction.

[0059] In one embodiment, the lengths of the first grille segments 401 and the second grille segments 402 are equal. In other alternative embodiments, the lengths of the first grille segments 401 and the second grille segments 402 are not equal.

[0060] Based on the above embodiment, in a preferred embodiment, the radial distance between the air grille 4 and the wind wheel 3 is F, where 1D / 6 ≤ F ≤ 1D / 3. If the spacing between the air grille 4 and the wind wheel 3 is too small, pressure pulsation at the air duct outlet will increase, thereby increasing broadband noise within the flow field. Furthermore, an excessively small outlet gap will lead to uneven fluid transition within the flow field, resulting in air volume loss and reduced outlet wind speed. Therefore, this embodiment limits the radial distance between the air grille 4 and the wind wheel 3, preventing excessive noise at the air duct outlet, reducing air volume loss, and ensuring a sufficient outlet wind speed.

[0061] On the basis of the above embodiment, in a preferred embodiment, the distance between two adjacent first grid segments 401 or two adjacent second grid segments 402 is the length of N wind wheel segments 301, 1≤N≤3. The distance between two adjacent first grille segments 401 is the height of the second grille segment 402, and the distance between two adjacent second grille segments 402 is the height of the first grille segment 401. This embodiment limits the height of the first grille segment 401 and the height of the second grille segment 402, that is, limits the discrete dislocation frequency of the grille. Due to the action of the volute 1 and the volute tongue 2, a vortex will be formed in the flow field of the wind wheel 3 in the crossflow air duct. When the vortex deviates from the center of the impeller's rotation axis, crossflow will be generated; if the height of the first grille segment 401 and the second grille segment 402 is too low, the discrete frequency of the flow field at the outlet will increase, affecting the wind pressure inside the air duct, making the position of the single-segment eccentric vortex unstable, and unable to form a stable crossflow area inside the impeller. The flow field between adjacent segments is turbulent, which will have a great impact on the noise, sound quality, outlet wind speed and flow rate of the whole machine; if the height of the first grille segment 401 and the second grille segment 402 is too large, the flow field dislocation amplitude will increase, resulting in the dislocation of the air supply from the adjacent segment air ducts unable to converge at a farther distance, resulting in a significant left and right deviation of the wind feeling, affecting the user experience. Therefore, this embodiment limits the height of the first grille segment 401 and the height of the second grille segment 402, which can ensure that a stable throughflow area is formed inside the impeller, will not affect the noise, sound quality, outlet wind speed and flow of the entire machine, and the wind speed on the left and right sides is uniform.

[0062] Example 2

[0063] This embodiment provides a fan, including the cross-flow air duct provided in the above embodiment.

[0064] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A cross-flow air duct, characterized in that: include: A volute (1), the volute (1) comprising a first body (101), a first side of the first body (101) being an air inlet side, a second side of the first body (101) being an air outlet side, and a plurality of first air guide plates (102) spaced apart and distributed along the axial direction of the volute (1); A volute tongue (2) is spaced apart from the volute (1), the volute tongue (2) includes a second body (201), the first side of the second body (201) is an air inlet side, the second side of the second body (201) is an air outlet side, an installation space suitable for installing a wind wheel (3) is formed between the first body (101) and the second body (201), an air inlet is formed between the first side of the first body (101) and the first side of the second body (201), an air outlet is formed between the second side of the first body (101) and the second side of the second body (201), a plurality of second air guide plates (202) spaced apart along the axial direction of the volute (1) are provided on the second side of the second body (201), and the first air guide plates (102) and the second air guide plates (202) are staggered in the axial direction of the volute (1).

2. The cross-flow air duct according to claim 1, characterized in that: The first wind guide plate (102) comprises a first plate body (1021) and a first wind guide surface (1022) provided at an end of the first plate body (1021) and extending toward the outside of the installation space; a second wind guide surface (103) is further provided on a second side of the first plate body (1021); the second wind guide surface (103) extends toward the outside of the installation space; The second wind guide plate (202) includes a second plate body (2021) and a third wind guide surface (2022) provided at the end of the second plate body (2021) and extending toward the outside of the installation space. A fourth wind guide surface (203) is also provided on the second side of the second plate body (2021), and the fourth wind guide surface (203) extends toward the outside of the installation space.

3. The cross-flow air duct according to claim 2, characterized in that: The central symmetric plane between the first wind guide surface (1022) and the second wind guide surface (103) is defined as the first plane (6), the central symmetric plane between the third wind guide surface (2022) and the fourth wind guide surface (203) is defined as the second plane (7), and the angle between the first plane (6) and the second plane (7) is θ, 0<θ≤40°.

4. The cross-flow air duct according to claim 3, characterized in that: The central symmetry plane between the second side of the first body (101) and the second side of the second body (201) is defined as a misalignment reference plane (5), the first surface (6) and the second surface (7) are located on both sides of the misalignment reference plane (5), the angle between the first surface (6) and the misalignment reference plane (5) is θ1, the angle between the second surface (7) and the misalignment reference plane (5) is θ2, 0<θ1≤20°, and / or, 0<θ2≤20°.

5. The cross-flow air duct according to claim 1, characterized in that: A first side of the first body (101) is provided with a plurality of third air guide plates (104) distributed at intervals along the axial direction of the volute (1).

6. The cross-flow air duct according to claim 1, characterized in that: An air inlet guide surface (204) is provided on the first side of the second body (201).

7. The cross-flow air duct according to any one of claims 1 to 6, characterized in that: The cross-flow air duct further comprises a wind wheel (3) arranged in the installation space, and the diameter of the wind wheel (3) is D.

8. The cross-flow air duct according to claim 7, characterized in that: The cross section of the second body (201) is an arc, and the axis of the second body (201) is collinear with the axis of the wind wheel (3).

9. The cross-flow air duct according to claim 8, characterized in that: The minimum radial distance between the second body (201) and the wind wheel (3) is A, 1D / 28≤A≤1D / 10.

10. The cross-flow air duct according to claim 7, characterized in that: The position where the distance between the first body (101) and the wind wheel (3) is the smallest is the snail throat (105), and the distance between the snail throat (105) and the wind wheel (3) is B, 1D / 22≤B≤1D / 11.

11. The cross-flow air duct according to claim 7, characterized in that: The wind wheel (3) comprises a plurality of wind wheel segments (301), and the distance between two adjacent first wind guide plates (102) or two adjacent second wind guide plates (202) is the length of N wind wheel segments (301), where 1≤N≤3.

12. A fan, characterized in that: The invention comprises the cross-flow air duct according to any one of claims 1 to 11.

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