CN210568855U

CN210568855U - Air duct assembly and device with same

Info

Publication number: CN210568855U
Application number: CN201921577057.2U
Authority: CN
Inventors: 梁浩; 侯剑飞; 孙土春; 柳洲; 吴俊�
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2019-09-20
Filing date: 2019-09-20
Publication date: 2020-05-19
Anticipated expiration: 2029-09-20

Abstract

The utility model provides a pair of air duct assembly and device that has air duct assembly, wherein air duct assembly includes: the air conditioner comprises a shell, wherein an air inlet is formed in the first side of the shell, an air outlet is formed in the second side of the shell, and the first side and the second side are arranged oppositely; the wind wheel is arranged in the shell and is positioned between the air inlet and the air outlet; the volute tongue is arranged at the air outlet, and a gap is formed between the volute tongue and the wind wheel; and the guide plate is arranged at the downstream position of the airflow backflow direction of the volute tongue and extends from the second side to the inner side of the shell. Can carry out the water conservancy diversion to the backward flow through the clearance between snail tongue and the wind wheel, make the intersection position of backward flow and incoming flow keep away from the snail tongue, simultaneously, the guide plate also carries out the water conservancy diversion to the incoming flow, avoids the incoming flow direct impact to the downside position of snail tongue and flows back and intersect to can the noise reduction.

Description

Air duct assembly and device with same

Technical Field

The utility model relates to an air conditioner technical field, concretely relates to wind channel subassembly and have device of wind channel subassembly.

Background

The cooling fan, also known as an air-conditioning fan, is a refrigeration device, has the characteristics of low power consumption, environmental protection, health, natural humidification and the like, and is deeply loved by consumers. The principle of the cooling fan is mature, namely, air suction power is provided through the wind wheel and the air channel assembly, outside air is sucked through the wet curtain and then is sent to the outside, and the effects of air exchange and cooling are achieved.

At present, three types of wind wheels, namely a cross-flow wind wheel, a centrifugal wind wheel and an axial flow wind wheel, are adopted, wherein the cross-flow wind wheel and a component are generally applied to a cooling fan due to simple structure, small size and convenience. The design of the cross flow wind wheel and the air duct assembly thereof is relatively mature, but due to the limitation of the appearance size, the arrangement of the whole air inlet and outlet is very different, and the performance of the whole machine is also different. For the vertical cross-flow air duct, the cooling fan structure with air inlet at the rear part and air outlet at the front part, as the air inlet at the rear part, the main air flow and the air flow which flows back through the gap between the volute tongue and the wind wheel meet near the volute tongue to generate squealing sound, and the tone quality experience of the whole machine is seriously influenced.

SUMMERY OF THE UTILITY MODEL

Therefore, the to-be-solved technical problem of the utility model lies in overcoming the great defect of air cooler noise among the prior art to a can reduce the wind channel subassembly of noise and have the device of wind channel subassembly is provided.

In order to solve the technical problem, the utility model provides a pair of air duct assembly, include:

the air conditioner comprises a shell, wherein an air inlet is formed in the first side of the shell, an air outlet is formed in the second side of the shell, and the first side and the second side are arranged oppositely;

the wind wheel is arranged in the shell and is positioned between the air inlet and the air outlet;

the volute tongue is arranged at the air outlet, and a gap is formed between the volute tongue and the wind wheel;

and the guide plate is arranged at the downstream position of the airflow backflow direction of the volute tongue and extends from the second side to the inner side of the shell.

The guide plate is arranged below the volute tongue.

A gap is formed between the guide plate and the volute tongue.

the included angle between the connecting line of the lower end point of the volute tongue close to the wind wheel and the center of the wind wheel and the connecting line of the end point of the guide plate close to the wind wheel and the center of the wind wheel is α, and α is more than or equal to 20 degrees and less than or equal to 50 degrees.

α is 45 deg..

The guide plate is provided with a first surface far 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, and the length of the first surface is greater than that of the second surface.

The length of the first face is h1, the length of the second face is h2, and the ratio of h2/h1 is not less than 0.5 and not more than 0.25.

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 D1 is more than or equal to 0.125D and less than or equal to 0.25D.

The difference between h1 and h2 is C, and C is more than or equal to 10mm and less than or equal to 15 mm.

The distance between the guide plate and the volute tongue is L1, and L1 is more than 40mm and less than 60 mm.

Be equipped with the wind channel board in the casing, the wind channel board by the air intake extends to being close to the air outlet the wind channel board is close to the one end of air intake is first side, is located the position directly over the wind wheel is the top, is located the one end of air outlet is the second side, the wind channel board with the distance of the rotation center of wind wheel, certainly first side end extremely the top crescent.

The included angle between the connecting line of the first side end and the rotation center of the wind wheel and the connecting line of the top end and the rotation center of the wind wheel is theta 1, and theta 1 is more than or equal to 80 degrees and less than or equal to 120 degrees.

The distance between the first side end and the wind wheel is a1, the diameter of the wind wheel is D, and a1/D is more than or equal to 0.03 and less than or equal to 0.09.

A plane is formed between the top end and the second side end and is tangent to the arc surface formed by the top end and the first side end.

The end, close to the plane, of the volute tongue is a top end face, the end, far away from the plane, of the volute tongue is a bottom end face, the top end face is an inclined face, the volute tongue is obliquely and upwards arranged from the end, close to the air outlet, to the end, close to the wind wheel, of the volute tongue, the included angle formed between the inclined face and the plane is theta 2, and theta 2 is larger than or equal to 15 degrees and smaller than or equal to 30 degrees.

The distance between the top end face and the wind wheel is a2, the distance between the bottom end face and the wind wheel is a3, and a2 is more than a 3.

The distance between the volute tongue and the wind wheel is gradually reduced from the top end face to the bottom end face.

The included angle between the connecting line of one end of the bottom end face, close to the wind wheel, and the rotation center of the wind wheel and the connecting line of the first side end and the rotation center of the wind wheel is theta 3, and theta 3 is larger than or equal to 120 degrees and smaller than or equal to 180 degrees.

The air inlet is provided with a wet curtain, the distance between the first side end and the wet curtain is L2, and L2 is not less than 15mm and not more than 40 mm.

The utility model also provides a device with wind channel subassembly, include a wind channel subassembly.

The device with the air duct assembly is an air conditioning fan.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a pair of air duct assembly, the low reaches position through the airflow reflux direction at the snail tongue sets up the guide plate, the guide plate is extended by the inboard of the second lateral casing of casing, can carry out the water conservancy diversion to the backward flow through the clearance between snail tongue and the wind wheel, the snail tongue is kept away from with the position of crossing of incoming flow to the messenger backward flow, and simultaneously, the guide plate also carries out the water conservancy diversion to the incoming flow, the downside position of avoiding the incoming flow direct impact to the snail tongue crosses with the backward flow, therefore, the setting up of guide plate makes the backward flow keep away from the snail tongue with the position of crossing of incoming flow, thereby can the noise reduction.

2. The utility model provides a pair of air duct assembly, the guide plate with have the clearance between the snail tongue, set up like this and can not make the thickness of snail tongue too big to can not reduce the angle of admitting air, under the prerequisite of guaranteeing the intake, the power of this air duct assembly is less.

3. the utility model provides a pair of air duct assembly, being close to of snail tongue the lower extreme point of wind wheel with the line at the center of wind wheel, with being close to of guide plate the extreme point of wind wheel with the contained angle of the line at the center of wind wheel is alpha, 20 ≤ alpha ≤ 50, and the incoming flow receives the influence of guide plate, strikes the change of route behind the guide plate lower side, keeps away from the snail tongue, and the vortex tongue is kept away from with the intersection position of incoming flow to the backward flow is through the water conservancy diversion of guide plate to can reduce the noise.

4. The utility model provides a pair of air duct assembly, the guide plate has and keeps away from the first face of snail tongue, be close to the second face of snail tongue, first face with the distance of second face does the thickness of guide plate, the length of first face is greater than the second face's length, guide plate carry out the water conservancy diversion to the backward flow, make the backward flow through the direction flow of keeping away from the snail tongue towards, carry out the water conservancy diversion to the incoming flow simultaneously, changed the intersection position of incoming flow and backward flow, reduce the impact of air current, effectively improve and whistle.

5. The utility model provides a pair of air duct assembly, the dihedral being close to of second the one end of wind wheel with the interval of wind wheel is D1, the diameter of wind wheel is D, and 0.125D is less than or equal to D1 and is less than or equal to 0.25D, and the setting can effectively water conservancy diversion like this, can not produce new noise yet.

6. The utility model provides a pair of air duct assembly, the guide plate with the interval of snail tongue is L1, and 40mm < L1 < 60mm sets up the thickness that can not make the snail tongue too big like this to can not reduce the angle of admitting air, under the prerequisite of guaranteeing the intake, the power of this air duct assembly is less.

7. The utility model provides a pair of air duct assembly, be equipped with the wind channel board in the casing, the wind channel board by the air intake extends to be close to the air outlet the wind channel board is close to the one end of air intake is first side, is located the position directly over the wind wheel is the top, is located the one end of air outlet is the second side, the wind channel board with the distance of the center of rotation of wind wheel, certainly first side extremely the top crescent can guarantee the normal work of this wind channel assembly, makes the wind get into through the air intake, goes out from the air outlet behind the wind wheel, and the noise is less.

8. The utility model provides a pair of air duct assembly, first side with the line of the rotation center of wind wheel, with the top with the contained angle of the line of the rotation center of wind wheel is theta 1, and 80 is less than or equal to theta 1 and is less than or equal to 120, can guarantee the high efficiency air-out of this air duct assembly.

9. The utility model provides a pair of air duct assembly, first side with the interval of wind wheel is a1, the diameter of wind wheel is D, and 0.03 is less than or equal to a1/D is less than or equal to 0.09, can guarantee this air duct assembly's normal work, can the noise reduction again.

10. The utility model provides a pair of air duct assembly, the top with form the plane between the second side, and this plane with the top with the arc surface that first side end formed is tangent, and the air-out of this air duct assembly is comparatively smooth and easy.

11. The utility model provides a pair of air duct assembly, the snail tongue is close to planar one end is the top face, keeps away from planar one end is the bottom face, the top face is the inclined plane, and is close to certainly the one end of air outlet is to being close to in the direction of the one end of wind wheel, the slope upwards sets up, the inclined plane with planar contained angle is theta 2, and 15 degrees theta 2 that is more than or equal to is less than or equal to 30, sets up like this and makes the angle of air-out great, and can reduce the amount of wind of backward flow.

12. The utility model provides a pair of air duct assembly, the top end face with the interval of wind wheel is a2, the bottom end face with the interval of wind wheel is a3, and a2 > a3 can reduce the amount of wind that returns from the clearance of snail tongue and wind wheel, simultaneously because the interval of top end face and wind wheel is great, can the noise reduction.

13. The utility model provides a pair of air duct assembly, the snail tongue with the interval of wind wheel, certainly top end face extremely the direction of bottom face reduces gradually, and interval between snail tongue and wind wheel constantly changes, and when the air current passed through the snail tongue, the pressure artery is inconsistent, can effectively restrain the air current and produce the ear-pricking sound when passing through the snail tongue, can the noise reduction, and can reduce the amount of wind that returns from the clearance of snail tongue and wind wheel.

14. The utility model provides a pair of air duct assembly, being close to of bottom face the one end of wind wheel with the line of the rotation center of wind wheel, with first side with the contained angle of the line of the rotation center of wind wheel is theta 3, and 120 is less than or equal to theta 3 and is less than or equal to 180, and the angle of air inlet is great, has effectively guaranteed the intake.

15. The utility model provides a pair of air duct assembly, air intake department is equipped with wet curtain, first side with the interval of wet curtain is L2, and 15mm is less than or equal to L2 and is less than or equal to 40mm, can guarantee air inlet efficiency, also can guarantee that the air that gets into in the wind channel does not contain steam.

16. The utility model provides a pair of device with wind channel subassembly, include a wind channel subassembly, the device noise is less.

17. The utility model provides a pair of device with wind channel subassembly, the device with wind channel subassembly is the air cooler, and this air cooler both the noise is less, and the outward appearance is also more pleasing to the eye.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an air duct assembly according to a first embodiment of the present invention;

FIG. 2 is a schematic structural view of an air duct assembly shown in FIG. 1 with portions thereof being indicated in phantom;

FIG. 3 is a schematic structural view of an air duct assembly shown in FIG. 1 with portions thereof being indicated in phantom;

FIG. 4 is a schematic view of the air flow direction of a prior art air duct assembly;

FIG. 5 is a schematic view of an air flow direction of an air duct assembly shown in FIG. 1;

description of reference numerals:

1-a shell; 2-air inlet; 3, air outlet; 4-wind wheel; 5-volute tongue; 6-a deflector; 7-air duct plate; 8-wet curtain; 9-an air inlet grille; 10-wind deflector.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

The present embodiment provides a specific implementation of an air duct assembly, as shown in fig. 1 to 5, including a housing 1, a wind wheel 4, a volute tongue 5, and a baffle 6.

An air inlet 2 is arranged on a first side of the shell 1, an air inlet grille 9 is arranged at the air inlet 2, an air outlet 3 is arranged on a second side, an air deflector 10 is arranged at the air outlet 3, and the first side and the second side are arranged oppositely; the wind wheel 4 is arranged in the shell 1 and is positioned between the air inlet 2 and the air outlet 3; the volute tongue 5 is arranged at the air outlet 3, and a gap is formed between the volute tongue 5 and the wind wheel 4; the baffle 6 is arranged at the downstream position of the volute tongue 5 in the air flow backflow direction and extends from the second side to the inner side of the shell 1.

In the present embodiment, as shown in fig. 1, the baffle 6 is provided below the volute tongue 5. In an alternative embodiment, the deflector 6 is located above the volute tongue 5 and the outlet 3 is located below the volute tongue 5.

As shown in fig. 1, a gap is formed between the baffle 6 and the volute tongue 5, so that the thickness of the volute tongue 5 is not too large, the air inlet angle is not reduced, and the power of the air duct assembly is low on the premise of ensuring the air inlet amount. In an alternative embodiment, the deflector 6 is in direct contact with the volute tongue 5 without a gap, so that the arrangement can also change the intersection position of the incoming flow and the return flow, but the arrangement can cause too long return flow, large air volume loss and small air inlet angle, thereby consuming larger power on the premise of ensuring the same air inlet volume.

as shown in fig. 2, an included angle between a connecting line between the lower end point of the volute tongue 5 close to the wind wheel 4 and the center of the wind wheel 4 and a connecting line between the end point of the guide plate 6 close to the wind wheel 4 and the center of the wind wheel 4 is α, α is greater than or equal to 20 degrees and less than or equal to 50 degrees, as shown in fig. 5, incoming flow is influenced by the guide plate 6, the path is changed after impacting the lower side of the guide plate 6, the incoming flow is far away from the volute tongue 5, and the backflow is guided by the guide plate 6 and the intersection position of the incoming flow is far away from the volute tongue 5, so that noise.

in a preferred embodiment, α is 45 °.

The guide plate 6 is provided with a first surface far 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 that of the second surface. From the direction of second face to first face, the length of guide plate 6 increases gradually to the side that makes guide plate 6 be close to wind wheel 4 is the inclined plane. The guide plate 6 guides the backflow, so that the backflow flows towards the direction far away from the volute tongue 5, and meanwhile, the inflow is guided, the intersection position of the inflow and the backflow is changed, the impact of the airflow is reduced, and the squeaking sound is effectively improved.

In order to further reduce noise, the distance between one 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 D1 is not less than 0.125D and not more than 0.25D.

The diameter D of the wind wheel 4 is 120mm as a specific embodiment, h1 is less than 60mm, the difference value between h1 and h2 is C, C is more than or equal to 10mm and less than or equal to 15mm, the distance between the guide plate 6 and the volute tongue 5 is L1, L1 is more than 40mm and less than 60mm, the thickness of the volute tongue 5 is not too large, the air inlet angle is not reduced, and the power of the air duct assembly is smaller on the premise of ensuring the air inlet amount.

Be equipped with wind channel board 7 in the casing 1, wind channel board 7 by air intake 2 extends to being close to air outlet 3 wind channel board 7 is close to the one end of air intake 2 is first side, is located the position directly over the wind wheel 4 is the top, is located the one end of air outlet 3 is the second side, wind channel board 7 with the distance of the rotation center of wind wheel 4, certainly first side extremely the top crescent.

The included angle between the connecting line of the first side end and the rotation center of the wind wheel 4 and the connecting line of the top end and the rotation center of the wind wheel 4 is theta 1, theta 1 is larger than or equal to 80 degrees and smaller than or equal to 120 degrees, and high-efficiency air outlet of the air duct assembly can be guaranteed.

The distance between the first side end and the wind wheel 4 is a1, the diameter of the wind wheel 4 is D, and a1/D is more than or equal to 0.03 and less than or equal to 0.09.

In order to ensure smooth air outlet, 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 volute tongue 5 is close to one end of the plane and is a top end face, one end of the volute tongue far away from the plane is a bottom end face, the top end face is an inclined face, the volute tongue is obliquely and upwards arranged from one end close to the air outlet 3 to one end close to the wind wheel 4, the inclined face and the plane form an included angle theta 2, theta 2 is larger than or equal to 15 degrees and smaller than or equal to 30 degrees, the air outlet angle is larger due to the arrangement, and the backflow air volume can be reduced.

The distance between the top end face and the wind wheel 4 is a2, the distance between the bottom end face and the wind wheel 4 is a3, a2 is more than a3, the air volume returned from the gap between the volute tongue 5 and the wind wheel 4 can be reduced, and meanwhile, the distance between the top end face and the wind wheel 4 is larger, so that the noise can be reduced.

In 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, the distance between the volute tongue 5 and the wind wheel 4 continuously changes, and when an airflow passes through the volute tongue 5, pressure arteries are inconsistent, so that the generation of a harsh sound when the airflow passes through the volute tongue 5 can be effectively suppressed, noise can be reduced, and the amount of air returning from a gap between the volute tongue 5 and the wind wheel 4 can be reduced.

In order to ensure the air intake, the included angle between the connecting line of one end of the bottom end surface, which is close to the wind wheel 4, and the rotation center of the wind wheel 4 and the connecting line of the first side end and the rotation center of the wind wheel 4 is theta 3, and theta 3 is more than or equal to 120 degrees and less than or equal to 180 degrees.

The air inlet 2 is provided with a wet curtain 8, the distance between the first side end and the wet curtain 8 is L2, L2 is not less than 15mm and not more than 40mm, air inlet efficiency can be guaranteed, and air entering the air duct does not contain water vapor.

When the air duct assembly in the prior art operates, as shown in fig. 4, air directly flows below the volute tongue 5, and then meets with the backflow in the vicinity of the volute tongue 5, so that a howling sound is generated. When the air duct assembly operates, air is cooled after passing through the wet curtain 8, enters the air duct through the air inlet 2, is blown out through the air outlet 3 under the action of the wind wheel 4, and is filled in the shell 1 after entering the air duct, part of the air is blocked by the guide plate 6 and cannot directly impact the lower part of the volute tongue 5, the guide plate 6 guides the part of the air to be far away from the volute tongue 5, meanwhile, part of the air can flow back through the gap between the volute tongue 5 and the wind wheel 4, the guide plate 6 can guide the flow back, the intersection position of the flow back and the incoming flow is far away from the volute tongue 5, and therefore noise can be reduced.

Example 2

The embodiment provides a device with an air duct assembly, which comprises the air duct assembly provided in the embodiment and is low in noise.

As a specific implementation mode, the device with the air duct assembly is an air conditioner fan, the air conditioner fan is low in noise, and when the air conditioner fan is used, the side provided with the air inlet 2 is located on the back of the air conditioner fan, so that the air inlet 2 cannot be seen in appearance, and the air conditioner fan is attractive.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. An air duct assembly, comprising:

the air conditioner comprises a shell (1), wherein an air inlet (2) is formed in the first side of the shell (1), an air outlet (3) is formed in the second side of the shell, and the first side and the second side are arranged oppositely;

the wind wheel (4) is arranged in the shell (1) and is positioned between the air inlet (2) and the air outlet (3);

the volute tongue (5) is arranged at the air outlet (3), and a gap is formed between the volute tongue (5) and the wind wheel (4);

and the guide plate (6) is arranged at the downstream position of the volute tongue (5) in the airflow backflow direction and extends from the second side to the inner side of the shell (1).

2. An air duct assembly according to claim 1, characterized in that the deflector (6) is arranged below the volute tongue (5).

3. An air duct assembly according to claim 2, characterized in that there is a gap between the deflector (6) and the volute tongue (5).

4. an air duct assembly according to claim 3, characterized in that the included angle between the connecting line of 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 connecting line of the end point of the deflector plate (6) close to the wind wheel (4) and the center of the wind wheel (4) is α, and α is more than or equal to 20 degrees and less than or equal to 50 degrees.

5. an air duct assembly according to claim 4, wherein α is 45 °.

6. An air duct assembly according to any of claims 1-5, characterized in that the deflector (6) has a first face remote from the volute tongue (5) and a second face close to the volute tongue (5), the first face being at a distance from the second face of the thickness of the deflector (6), the first face having a length greater than the second face.

7. An air duct assembly according to claim 6, wherein the first face has a length h1 and the second face has a length h2, 0.25 ≦ h2/h1 ≦ 0.5.

8. An air duct assembly according to claim 6, characterized in that the end of the second surface close to the wind wheel (4) is spaced from the wind wheel (4) by a distance D1, the diameter of the wind wheel (4) is D, 0.125D 1D 0.25D.

9. An air duct assembly according to claim 7, wherein the difference between h1 and h2 is C, 10mm ≦ C ≦ 15 mm.

10. An air duct assembly according to claim 3, characterized in that the distance between the deflector (6) and the volute tongue (5) is L1, 40mm < L1 < 60 mm.

11. An air duct assembly according to claim 1, wherein an air duct plate (7) is provided in the housing (1), the air duct plate (7) extends from the air inlet (2) to a position close to the air outlet (3), one end of the air duct plate (7) close to the air inlet (2) is a first side end, a position right above the wind wheel (4) is a top end, one end of the air outlet (3) is a second side end, and a distance between the air duct plate (7) and a rotation center of the wind wheel (4) gradually increases from the first side end to the top end.

12. An air duct assembly according to claim 11, characterized in that the angle θ 1 between the line of the first side end and the centre of rotation of the wind wheel (4) and the angle θ 1 between the top end and the centre of rotation of the wind wheel (4) is 80 ° ≦ θ 1 ≦ 120 °.

13. An air duct assembly according to claim 11, characterized in that the first side end is spaced from the wind wheel (4) by a distance a1, the wind wheel (4) has a diameter D, 0.03 a 1/D0.09.

14. An air chute assembly according to claim 11 wherein a plane is defined between the apex and the second side end and is tangent to the arcuate surface defined by the apex and the first side end.

15. An air duct assembly according to claim 14, wherein the end of the volute tongue (5) close to the plane is a top end surface, the end far away from the plane is a bottom end surface, the top end surface is an inclined surface, and the inclined surface is inclined upwards in the direction from the end close to the air outlet (3) to the end close to the wind wheel (4), and the included angle between the inclined surface and the plane is θ 2, and θ 2 is more than or equal to 15 ° and less than or equal to 30 °.

16. An air duct assembly according to claim 15, characterized in that the top end face is spaced a2 from the wind wheel (4) and the bottom end face is spaced a3 from the wind wheel (4), a2 > a 3.

17. An air duct assembly according to claim 15, wherein the distance between the volute tongue (5) and the wind wheel (4) decreases from the top end surface to the bottom end surface.

18. An air duct assembly according to claim 15, characterized in that the angle θ 3 between the line of the end of the bottom end surface close to the wind wheel (4) and the rotation center of the wind wheel (4) and the line of the first side end and the rotation center of the wind wheel (4) is 120 ° ≦ θ 3 ≦ 180 °.

19. An air duct assembly according to claim 11, characterized in that the air inlet (2) is provided with a wet curtain (8), and the first side end is spaced from the wet curtain (8) by L2, 15mm ≤ L2 ≤ 40 mm.

20. A device having an air duct assembly comprising an air duct assembly as claimed in any one of claims 1 to 19.

21. The apparatus of claim 20, wherein the apparatus is an air conditioning fan.