Air duct assembly and device having the same

Abstract

The present invention provides an air duct assembly and a device having the air duct assembly, wherein the air duct assembly comprises: a shell, wherein the first side of the shell is provided with an air inlet, the second side is provided with an air outlet, and the first side is arranged opposite to the second side; a wind wheel, which is arranged in the shell and located between the air inlet and the air outlet; a volute tongue, which is arranged at the air outlet, and there is a gap between the volute tongue and the wind wheel; a guide plate, which is arranged at a downstream position of the airflow return direction of the volute tongue and extends from the second side to the inner side of the shell. The guide plate can guide the return flow passing through the gap between the volute tongue and the wind wheel, so that the intersection position of the return flow and the incoming flow is far away from the volute tongue. At the same time, the guide plate also guides the incoming flow to prevent the incoming flow from directly impacting the lower side of the volute tongue and intersecting with the return flow, thereby reducing noise.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air duct component and a device having the air duct component. Background Art

[0002] Cooling fan, also known as air conditioning fan, is a refrigeration device. It has the characteristics of low power consumption, environmental protection, health, natural humidification, etc., and is deeply loved by consumers. The principle of cooling fan is very mature, that is, the wind wheel and air duct components provide suction power, suck the outside air through the wet curtain, and then send it to the outside to achieve the effect of ventilation and cooling.

[0003] At present, there are three types of wind wheels: crossflow wind wheel, centrifugal wind wheel, and axial flow wind wheel. Among them, crossflow wind wheel and its components are widely used in cooling fans due to their simple structure, compactness and convenience. The design of crossflow wind wheel and its air duct components is relatively mature, but due to the limitation of appearance size, the overall inlet and outlet arrangement varies greatly, and the performance of the whole machine will also be different. For the vertical crossflow air duct, the cooling fan structure with air inlet at the rear and air outlet at the front, because the air inlet is at the rear, the main airflow and the airflow returning through the gap between the volute tongue and the wind wheel will meet near the volute tongue, producing a whistling sound, which seriously affects the sound quality experience of the whole machine. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of high noise of the air-conditioning fan in the prior art, thereby providing an air duct component and a device having the air duct component that can reduce noise.

[0005] In order to solve the above technical problems, the present invention provides an air duct assembly, comprising:

[0006] A housing, wherein an air inlet is provided on a first side of the housing, an air outlet is provided on a second side of the housing, and the first side is arranged opposite to the second side;

[0007] A wind wheel, arranged in the housing and located between the air inlet and the air outlet;

[0008] A volute tongue is arranged at the air outlet, and there is a gap between the volute tongue and the wind wheel;

[0009] The guide plate is arranged at a downstream position of the volute tongue in the airflow return direction and extends from the second side to the inner side of the shell.

[0010] The guide plate is arranged below the volute tongue.

[0011] A gap is provided between the guide plate and the volute tongue.

[0012] The angle between the line connecting the lower end point of the volute tongue close to the wind wheel and the center of the wind wheel and the line connecting the end point of the guide plate close to the wind wheel and the center of the wind wheel is α, 20°≤α≤50°.

[0013] α is 45°.

[0014] The guide plate has a first surface away from the volute tongue and a second surface close to the volute tongue. The distance between the first surface and the second surface is the thickness of the guide plate. The length of the first surface is greater than the length of the second surface.

[0015] The length of the first surface is h1, the length of the second surface is h2, and 0.25≤h2 / h1≤0.5.

[0016] The distance between one end of the second surface close to the wind wheel and the wind wheel is d1, the diameter of the wind wheel is D, and 0.125D≤d1≤0.25D.

[0017] The difference between h1 and h2 is C, 10mm≤C≤15mm.

[0018] The distance between the guide plate and the volute tongue is L1, 40mm<L1<60mm.

[0019] An air duct plate is provided in the shell, and the air duct plate extends from the air inlet to near the air outlet. The end of the air duct plate near the air inlet is a first side end, the position directly above the wind wheel is a top end, and the end located at the air outlet is a second side end. The distance between the air duct plate and the rotation center of the wind wheel gradually increases from the first side end to the top end.

[0020] An angle between a line connecting the first side end and the rotation center of the wind wheel and a line connecting the top end and the rotation center of the wind wheel is θ1, 80°≤θ1≤120°.

[0021] The distance between the first side end and the wind wheel is a1, the diameter of the wind wheel is D, and 0.03≤a1 / D≤0.09.

[0022] A plane is formed between the top end and the second side end, and the plane is tangent to an arc surface formed by the top end and the first side end.

[0023] The end of the volute tongue close to the plane is the top end surface, and the end away from the plane is the bottom end surface. The top end surface is an inclined surface, and is inclined upward in the direction from the end close to the air outlet to the end close to the wind wheel. The angle between the inclined surface and the plane is θ2, 15°≤θ2≤30°.

[0024] The distance between the top end surface and the wind wheel is a2, and the distance between the bottom end surface and the wind wheel is a3, and a2>a3.

[0025] The distance between the volute tongue and the wind wheel gradually decreases from the top end surface to the bottom end surface.

[0026] An angle between a line connecting one end of the bottom end surface close to the wind wheel and the rotation center of the wind wheel and a line connecting the first side end and the rotation center of the wind wheel is θ3, and 120°≤θ3≤180°.

[0027] A wet curtain is provided at the air inlet, and a distance between the first side end and the wet curtain is L2, 15mm≤L2≤40mm.

[0028] The present invention also provides a device with an air duct assembly, comprising the air duct assembly.

[0029] The device with the air duct component is an air conditioning fan.

[0030] The technical solution of the present invention has the following advantages:

[0031] 1. The present invention provides an air duct assembly, which, by arranging a guide plate at a downstream position of the airflow return direction of the volute tongue, extends from the second side of the shell to the inner side of the shell, and can guide the return flow passing through the gap between the volute tongue and the wind wheel, so that the intersection position of the return flow and the incoming flow is away from the volute tongue. At the same time, the guide plate also guides the incoming flow to prevent the incoming flow from directly impacting the lower side of the volute tongue and intersecting with the return flow. Therefore, the arrangement of the guide plate makes the intersection position of the return flow and the incoming flow away from the volute tongue, thereby reducing noise.

[0032] 2. The present invention provides an air duct assembly, wherein a gap is provided between the guide plate and the volute tongue. Such an arrangement will not make the thickness of the volute tongue too large, thereby not reducing the air intake angle. Under the premise of ensuring the air intake volume, the power of the air duct assembly is relatively small.

[0033] 3. The present invention provides an air duct assembly, wherein the angle between the line connecting the lower end point of the volute tongue close to the wind wheel and the center of the wind wheel and the line connecting the end point of the guide plate close to the wind wheel and the center of the wind wheel is α, 20°≤α≤50°, the incoming flow is affected by the guide plate, and the path is changed after impacting the lower side of the guide plate, away from the volute tongue, and the backflow passes through the guide of the guide plate, and the intersection with the incoming flow is away from the volute tongue, thereby reducing noise.

[0034] 4. The present invention provides an air duct assembly, wherein the guide plate has a first surface away from the volute tongue and a second surface close to the volute tongue, the distance between the first surface and the second surface is the thickness of the guide plate, the length of the first surface is greater than the length of the second surface, the guide plate guides the return flow so that the return flow flows in a direction away from the volute tongue, and at the same time guides the incoming flow, thereby changing the intersection position of the incoming flow and the return flow, reducing the impact of the airflow, and effectively improving the whistling sound.

[0035] 5. In the air duct assembly provided by the present invention, the distance between the end of the second surface close to the wind wheel and the wind wheel is d1, the diameter of the wind wheel is D, 0.125D≤d1≤0.25D, such a setting can effectively guide the flow without generating new noise.

[0036] 6. The present invention provides an air duct assembly, wherein the distance between the guide plate and the volute tongue is L1, 40mm<L1<60mm. Such an arrangement will not make the thickness of the volute tongue too large, thereby not reducing the air intake angle. Under the premise of ensuring the air intake volume, the power of the air duct assembly is relatively small.

[0037] 7. The present invention provides an air duct assembly, wherein an air duct plate is provided in the shell, and the air duct plate extends from the air inlet to near the air outlet. The end of the air duct plate near the air inlet is a first side end, the position directly above the wind wheel is a top end, and the end located at the air outlet is a second side end. The distance between the air duct plate and the rotation center of the wind wheel gradually increases from the first side end to the top end, which can ensure the normal operation of the air duct assembly, so that wind enters through the air inlet and exits from the air outlet after passing through the wind wheel with less noise.

[0038] 8. The present invention provides an air duct assembly, wherein the angle between the line connecting the first side end and the rotation center of the wind wheel and the line connecting the top end and the rotation center of the wind wheel is θ1, 80°≤θ1≤120°, which can ensure high-efficiency air outlet of the air duct assembly.

[0039] 9. In the air duct assembly provided by the present invention, the distance between the first side end and the wind wheel is a1, the diameter of the wind wheel is D, and 0.03≤a1 / D≤0.09, which can ensure the normal operation of the air duct assembly and reduce noise.

[0040] 10. The present invention provides an air duct assembly, wherein a plane is formed between the top end and the second side end, and the plane is tangent to the arc surface formed by the top end and the first side end, and the air outlet of the air duct assembly is smoother.

[0041] 11. The present invention provides an air duct assembly, wherein the end of the volute tongue close to the plane is a top end surface, and the end away from the plane is a bottom end surface, the top end surface is an inclined surface, and is inclined upward in the direction from the end close to the air outlet to the end close to the wind wheel, and the angle between the inclined surface and the plane is θ2, 15°≤θ2≤30°. Such an arrangement makes the air outlet angle larger and can reduce the amount of backflow air.

[0042] 12. The present invention provides an air duct assembly, wherein the distance between the top end surface and the wind wheel is a2, and the distance between the bottom end surface and the wind wheel is a3, a2>a3, which can reduce the amount of air returned from the gap between the volute tongue and the wind wheel. At the same time, since the distance between the top end surface and the wind wheel is larger, the noise can be reduced.

[0043] 13. The present invention provides an air duct assembly, wherein the distance between the volute tongue and the wind wheel gradually decreases from the top end surface to the bottom end surface, and the distance between the volute tongue and the wind wheel keeps changing. When the airflow passes through the volute tongue, the pressure arteries are inconsistent, which can effectively suppress the harsh sound generated when the airflow passes through the volute tongue, reduce noise, and reduce the amount of air returning from the gap between the volute tongue and the wind wheel.

[0044] 14. The present invention provides an air duct assembly, wherein the angle between a line connecting one end of the bottom end surface close to the wind wheel and the rotation center of the wind wheel and a line connecting the first side end and the rotation center of the wind wheel is θ3, 120°≤θ3≤180°, and the air inlet angle is relatively large, thereby effectively ensuring the air intake volume.

[0045] 15. The present invention provides an air duct assembly, wherein a wet curtain is provided at the air inlet, and the distance between the first side end and the wet curtain is L2, 15mm≤L2≤40mm, which can ensure both air intake efficiency and the air entering the air duct without water vapor.

[0046] 16. The present invention provides a device with an air duct assembly, including the air duct assembly described above, and the device has low noise.

[0047] 17. The present invention provides a device with an air duct component, wherein the device with the air duct component is an air conditioning fan, which has low noise and beautiful appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 A schematic structural diagram of an air duct assembly provided in a first embodiment of the present invention;

[0050] Figure 2 for Figure 1 A schematic diagram of the structure of an air duct assembly with partial dimension markings is shown;

[0051] Figure 3 for Figure 1 A schematic diagram of the structure of an air duct assembly with partial dimension markings is shown;

[0052] Figure 4 A schematic diagram of the air flow direction of an air duct assembly in the prior art;

[0053] Figure 5 for Figure 1 A schematic diagram of the air flow direction of an air duct assembly shown;

[0054] Description of reference numerals:

[0055] 1-shell; 2-air inlet; 3-air outlet; 4-wind wheel; 5-snail; 6-guide plate; 7-air duct plate; 8-wet curtain; 9-air inlet grille; 10-air guide plate. DETAILED DESCRIPTION

[0056] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0058] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0059] 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.

[0060] Example 1

[0061] This embodiment provides a specific implementation of an air duct assembly, such as Figures 1 to 5 As shown, it includes a housing 1, a wind wheel 4, a volute tongue 5, and a guide plate 6.

[0062] An air inlet 2 is provided on the first side of the shell 1, and an air inlet grille 9 is provided at the air inlet 2; an air outlet 3 is provided on the second side, and an air guide plate 10 is provided at the air outlet 3, and the first side and the second side are arranged opposite to each other; a wind wheel 4 is arranged in the shell 1, and is located between the air inlet 2 and the air outlet 3; a volute tongue 5 is arranged at the air outlet 3, and there is a gap between the volute tongue 5 and the wind wheel 4; a guide plate 6 is arranged at a downstream position of the volute tongue 5 in the airflow return direction, and extends from the second side to the inner side of the shell 1.

[0063] In this embodiment, if Figure 1 As shown, the guide plate 6 is arranged below the volute tongue 5. In an alternative embodiment, the guide plate 6 is located above the volute tongue 5, and the air outlet 3 is located below the volute tongue 5.

[0064] like Figure 1 As shown, there is a gap between the guide plate 6 and the volute tongue 5. This arrangement will not make the thickness of the volute tongue 5 too large, thereby not reducing the angle of air intake. Under the premise of ensuring the air intake volume, the power of the air duct assembly is relatively small. In an alternative embodiment, the guide plate 6 is in direct contact with the volute tongue 5 without a gap. This arrangement can also change the intersection position of the incoming flow and the return flow, but it will cause the return flow to be too long, resulting in a large air volume loss and a small air intake angle, so that under the premise of ensuring the same air intake volume, the power consumed is relatively large.

[0065] like Figure 2 As shown, the angle between the line connecting the lower end of the volute tongue 5 close to the wind wheel 4 and the center of the wind wheel 4 and the line connecting the end of the guide plate 6 close to the wind wheel 4 and the center of the wind wheel 4 is α, 20°≤α≤50°. Figure 5 The incoming flow is affected by the guide plate 6, and after impacting the lower side of the guide plate 6, the path is changed, away from the volute tongue 5, and the backflow passes through the guide of the guide plate 6, and the intersection position with the incoming flow is away from the volute tongue 5, thereby reducing noise.

[0066] As a preferred embodiment, α is 45°.

[0067] The guide plate 6 has a first surface away from the volute tongue 5 and a second surface close to the volute tongue 5. The distance between the first surface and the second surface is the thickness of the guide plate 6, and the length of the first surface is greater than the length of the second surface. From the second surface to the first surface, the length of the guide plate 6 gradually increases, so that the side of the guide plate 6 close to the wind wheel 4 is an inclined surface. The guide plate 6 guides the return flow, so that the return flow flows in the direction away from the volute tongue 5, and guides the incoming flow at the same time, changing the intersection position of the incoming flow and the return flow, reducing the impact of the airflow, and effectively improving the whistling sound.

[0068] The length of the first surface is h1, the length of the second surface is h2, and 0.25≤h2 / h1≤0.5.

[0069] To further reduce noise, the distance between the end of the second surface close to the wind wheel 4 and the wind wheel 4 is d1, the diameter of the wind wheel 4 is D, and 0.125D≤d1≤0.25D.

[0070] Taking the diameter D of the wind wheel 4 = 120 mm as a specific embodiment, h1 < 60 mm, the difference between h1 and h2 is C, 10 mm ≤ C ≤ 15 mm, the distance between the guide plate 6 and the volute tongue 5 is L1, 40 mm < L1 < 60 mm, the thickness of the volute tongue 5 will not be too large, thereby not reducing the air intake angle. Under the premise of ensuring the air intake volume, the power of the air duct assembly is relatively small.

[0071] An air duct plate 7 is provided in the shell 1, and the air duct plate 7 extends from the air inlet 2 to near the air outlet 3. The end of the air duct plate 7 near the air inlet 2 is a first side end, the position directly above the wind wheel 4 is a top end, and the end located at the air outlet 3 is a second side end. The distance between the air duct plate 7 and the rotation center of the wind wheel 4 gradually increases from the first side end to the top end.

[0072] The angle between the line connecting the first side end and the rotation center of the wind wheel 4 and the line connecting the top end and the rotation center of the wind wheel 4 is θ1, 80°≤θ1≤120°, which can ensure high-efficiency air outlet of the air duct assembly.

[0073] The distance between the first side end and the wind wheel 4 is a1, the diameter of the wind wheel 4 is D, and 0.03≤a1 / D≤0.09.

[0074] To ensure smooth air flow, a plane is formed between the top end and the second side end, and the plane is tangent to the arc surface formed by the top end and the first side end.

[0075] The end of the volute tongue 5 close to the plane is the top end surface, and the end away from the plane is the bottom end surface. The top end surface is an inclined surface, and is inclined upward in the direction from the end close to the air outlet 3 to the end close to the wind wheel 4. The angle between the inclined surface and the plane is θ2, 15°≤θ2≤30°. This arrangement makes the air outlet angle larger and can reduce the amount of backflow air.

[0076] The distance between the top end surface and the wind wheel 4 is a2, and the distance between the bottom end surface and the wind wheel 4 is a3, a2>a3, which can reduce the amount of wind returning from the gap between the volute tongue 5 and the wind wheel 4. At the same time, since the distance between the top end surface and the wind wheel 4 is large, the noise can be reduced.

[0077] As a preferred embodiment, the distance between the volute tongue 5 and the wind wheel 4 gradually decreases from the top end surface to the bottom end surface, and the distance between the volute tongue 5 and the wind wheel 4 keeps changing. When the airflow passes through the volute tongue 5, the pressure arteries are inconsistent, which can effectively suppress the harsh sound generated when the airflow passes through the volute tongue 5, reduce noise, and reduce the amount of air returning from the gap between the volute tongue 5 and the wind wheel 4.

[0078] To ensure the amount of air entering, the angle between the line connecting the end of the bottom surface close to the wind wheel 4 and the rotation center of the wind wheel 4 and the line connecting the first side end and the rotation center of the wind wheel 4 is θ3, 120°≤θ3≤180°.

[0079] A wet curtain 8 is provided at the air inlet 2, and a distance between the first side end and the wet curtain 8 is L2, 15mm≤L2≤40mm, which can ensure both air intake efficiency and air entering the air duct without water vapor.

[0080] When the air duct assembly in the prior art is in operation, Figure 4 As shown, the air will flow directly to the bottom of the volute tongue 5, and will intersect with the return flow near the volute tongue 5, generating a whistling sound. When the air duct assembly is in operation, the air is cooled after passing through the wet curtain 8, enters the air duct through the air inlet 2, and is blown out through the air outlet 3 under the action of the wind wheel 4. After entering the air duct, the air is filled in the housing 1. Part of the air is blocked by the guide plate 6 and cannot directly impact the bottom of the volute tongue 5. The guide plate 6 guides this part of the air to keep it away from the volute tongue 5. At the same time, part of the air will flow back through the gap between the volute tongue 5 and the wind wheel 4. The guide plate 6 can guide the return flow to keep the intersection of the return flow and the incoming flow away from the volute tongue 5, thereby reducing noise.

[0081] Example 2

[0082] This embodiment provides a device with an air duct assembly, including an air duct assembly provided in the above embodiment, and the device has low noise.

[0083] As a specific implementation, the device with the air duct assembly is an air conditioning fan, which has low noise. When in use, the side with the air inlet 2 is located on the back of the air conditioning fan, so the air inlet 2 is not visible from the appearance, which is more beautiful.

[0084] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. An air duct assembly, characterized in that: include: A shell (1), wherein a first side of the shell (1) is provided with an air inlet (2), a second side of the shell (1) is provided with an air outlet (3), and the first side and the second side are arranged opposite to each other; A wind wheel (4) is arranged in the housing (1) and located between the air inlet (2) and the air outlet (3); A volute tongue (5) is arranged at the air outlet (3), and a gap is provided between the volute tongue (5) and the wind wheel (4); A guide plate (6) is arranged at a downstream position of the volute tongue (5) in the direction of airflow return, and extends from the second side toward the inner side of the housing (1); the guide plate (6) has a first surface away from the volute tongue (5) and a second surface close to the volute tongue (5); the distance between the first surface and the second surface is the thickness of the guide plate (6); the length of the first surface is greater than the length of the second surface; the length of the first surface is h1, the length of the second surface is h2, 0.25≤h2 / h1≤0.5; a line connecting the lower end point of the volute tongue (5) close to the wind wheel (4) and the center of the wind wheel (4) , and the angle between the line connecting the end point of the guide plate (6) close to the wind wheel (4) and the center of the wind wheel (4) is α, 20°≤α≤50°; an air duct plate (7) is provided in the shell (1), and the air duct plate (7) extends from the air inlet (2) to the air outlet (3); the end of the air duct plate (7) close to the air inlet (2) is a first side end, the position directly above the wind wheel (4) is a top end, and the end located at the air outlet (3) is a second side end, and the distance between the air duct plate (7) and the rotation center of the wind wheel (4) gradually increases from the first side end to the top end; The angle between the line connecting the first side end and the rotation center of the wind wheel (4) and the line connecting the top end and the rotation center of the wind wheel (4) is θ1, 80°≤θ1≤120°; the distance between the first side end and the wind wheel (4) is a1, the diameter of the wind wheel (4) is D, 0.03≤a1 / D≤0.09; A plane is formed between the top end and the second side end, and the plane is tangent to the arc surface formed by the top end and the first side end; the end of the volute tongue (5) close to the plane is the top end surface, and the end away from the plane is the bottom end surface; the top end surface is an inclined surface, and is arranged to be inclined upward in the direction from the end close to the air outlet (3) to the end close to the wind wheel (4); the angle between the inclined surface and the plane is θ2, and 15°≤θ2≤30°.

2. The air duct assembly according to claim 1, characterized in that: The guide plate (6) is arranged below the volute tongue (5).

3. The air duct assembly according to claim 2, characterized in that: There is a gap between the guide plate (6) and the volute tongue (5).

4. The air duct assembly according to claim 1, characterized in that: α is 45°.

5. An air duct assembly according to any one of claims 1 to 4, characterized in that: The distance between an end of the second surface close to the wind wheel (4) and the wind wheel (4) is d1, and the diameter of the wind wheel (4) is D, 0.125D≤d1≤0.25D.

6. The air duct assembly according to claim 1, characterized in that: The difference between h1 and h2 is C, 10mm≤C≤15mm.

7. The air duct assembly according to claim 3, characterized in that: The distance between the guide plate (6) and the volute tongue (5) is L1, 40 mm < L1 < 60 mm.

8. The air duct assembly according to claim 1, characterized in that: The distance between the top end surface and the wind wheel (4) is a2, and the distance between the bottom end surface and the wind wheel (4) is a3, where a2>a3.

9. The air duct assembly according to claim 1, characterized in that: The distance between the volute tongue (5) and the wind wheel (4) gradually decreases from the top end surface to the bottom end surface.

10. The air duct assembly according to claim 1, characterized in that: The angle between a line connecting an end of the bottom end surface close to the wind wheel (4) and the rotation center of the wind wheel (4) and a line connecting the first side end and the rotation center of the wind wheel (4) is θ3, and 120°≤θ3≤180°.

11. The air duct assembly according to claim 1, characterized in that: A wet curtain (8) is provided at the air inlet (2), and a distance between the first side end and the wet curtain (8) is L2, 15 mm ≤ L2 ≤ 40 mm.

12. A device having an air duct assembly, characterized in that: An air duct assembly comprising any one of claims 1-11.

13. The device having an air duct assembly according to claim 12, characterized in that: The device with the air duct component is an air conditioning fan.

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