Air duct assembly, air conditioner indoor unit and air conditioner unit

Abstract

The utility model relates to an air duct assembly, an air conditioner indoor unit and an air conditioner unit, and the air duct assembly comprises a shell (1), a first air outlet (10) is formed in the top wall (11), a second air outlet (20) is formed in the bottom wall (12), and a reversing air duct (14) communicating with the first air outlet (10) and the second air outlet (20) is arranged in the shell (1); the centrifugal fan (2) is arranged in the shell (1) and located at the end, in the first direction (x), of the shell (1), the central axis of the centrifugal fan (2) extends in the first direction (x), and an outlet (21) of the centrifugal fan (2) communicates with the reversing air duct (14); the first flow guide assembly (6) and the second flow guide assembly (7) are movably arranged in the reversing air duct (14); in an upper air outlet state, the first flow guide assembly (6) is in an open state, and the second flow guide assembly (7) is in a closed state; and in the lower air outlet state, the first flow guide assembly (6) is in a closed state, and the second flow guide assembly (7) is in an open state.

Description

Air duct components, indoor air conditioning units and air conditioning units Technical Field

[0001] This disclosure relates to the field of air conditioning unit technology, and in particular to a duct assembly, an indoor air conditioning unit, and an air conditioning unit. Background Technology

[0002] As the application scope of air conditioning expands, users have increasingly higher requirements for the experience of ventilation devices. Generally, wall-mounted units adopt a cross-flow duct structure. Due to the large axial distance of the cross-flow fan blades, it is difficult to meet the requirements for changing the air outlet direction. If the duct reversal is to be achieved, a reversing duct that matches the axial dimensions of the cross-flow fan blades needs to be designed. However, there are significant problems in terms of the structural strength and reversing stability of the reversing duct. Summary of the Invention

[0003] The embodiments of this disclosure provide an air duct assembly, an indoor air conditioning unit, and an air conditioning unit that can easily meet the needs of switching the air outlet direction.

[0004] According to a first aspect of this disclosure, a duct assembly is provided, comprising:

[0005] The shell has a first air outlet on its top wall and a second air outlet on its bottom wall. The shell also has a reversing air duct that connects to the first and second air outlets.

[0006] A centrifugal fan is housed within a casing and located at the end of the casing along a first direction; the outlet of the centrifugal fan is connected to a reversing duct.

[0007] The first flow guiding component and the second flow guiding component are movably disposed in the reversing air duct. The first flow guiding component is configured to connect the outlet and the first air outlet in the open state and to disconnect the connection between the outlet and the first air outlet in the closed state. The second flow guiding component is configured to connect the outlet and the second air outlet in the open state and to disconnect the connection between the outlet and the second air outlet in the closed state.

[0008] Specifically, in the upper air outlet state of the air duct assembly, the first air guide component is in the open state and the second air guide component is in the closed state; in the lower air outlet state of the air duct assembly, the first air guide component is in the closed state and the second air guide component is in the open state.

[0009] In some embodiments, the central axis of the centrifugal fan extends along a first direction, and the housing has an opening on one side along a second direction, the second direction being perpendicular to the first direction. The duct assembly further includes:

[0010] A heat exchanger is installed at the opening, extending along a first direction and located on the side of the centrifugal fan near its inlet, with the windward side of the heat exchanger facing outward from the casing.

[0011] In some embodiments, the reversing duct is located inside the housing on the side away from the heat exchanger along the second direction, and the outlet faces the reversing duct.

[0012] In some embodiments, the first flow guiding component and / or the second flow guiding component includes a first plate rotatably connected to the housing to switch between an open state and a closed state.

[0013] In some embodiments, the first flow guiding component and / or the second flow guiding component includes:

[0014] At least two first boards;

[0015] A connecting rod connects at least two first plates, and in the open state, the connecting rod is spaced apart from the rotation axis of the first plates; and

[0016] A first drive mechanism is configured to drive the hinge shaft of one of the first plates to rotate, so that the first flow guide assembly or the second flow guide assembly switches between an open state and a closed state.

[0017] In the open state, at least two first plates are arranged in parallel with a gap between them; in the closed state, at least two first plates are arranged on the same plane and adjacent first plates are connected.

[0018] In some embodiments, the air duct assembly further includes:

[0019] The third airflow guiding component is fixedly installed in the reversing air duct and is configured to guide the airflow from the outlet to the first air outlet and / or the second air outlet.

[0020] In some embodiments, in the closed state, the two ends of the first flow guide component and the second flow guide component respectively abut against the third flow guide component and the housing.

[0021] In some embodiments, the third flow guiding component includes a second plate and a third plate, the first ends of which are respectively connected to the top wall and the bottom wall, and the second ends of which form a connection end in the middle region of the reversing air duct along the third direction, the third direction being perpendicular to the first direction;

[0022] The second and third plates are set at an angle, and the second end of each plate is closer to the centrifugal fan in the first direction than the first end.

[0023] In some embodiments, in the closed state, the first end of the first flow guiding component or the second flow guiding component abuts against the sidewall of the reversing duct along the second direction, and the second end abuts against the connection end.

[0024] In some embodiments, both the first flow guiding component and the second flow guiding component include a first plate.

[0025] When the first flow guiding component is in the closed state, the straight extension direction of the first plate and the third plate in the first flow guiding component is the same;

[0026] When the second flow guiding assembly is in the closed state, the first plate and the second plate in the second flow guiding assembly extend in the same straight direction.

[0027] In some embodiments, both the second and third plates are recessed toward each other.

[0028] In some embodiments, two centrifugal fans are provided, and the two centrifugal fans are respectively located at both ends of the housing along the first direction. The centrifugal fans include centrifugal fan blades.

[0029] The air duct assembly also includes a second drive mechanism connected between the two centrifugal fan blades and configured to drive the two centrifugal fan blades to rotate synchronously.

[0030] In some embodiments, the top wall is provided with two independent first air outlets along the first direction, and the bottom wall is provided with two independent second air outlets along the first direction. Each centrifugal fan is provided with a first flow guiding component and a second flow guiding component. The outlet of each centrifugal fan can be selectively connected to the first air outlet or the second air outlet on the same side.

[0031] In some embodiments, the duct assembly further includes two third flow guiding components, which are fixedly disposed in the middle region of the reversing duct along the first direction, and the two third flow guiding components are symmetrical with respect to the plane perpendicular to the first direction. The third flow guiding components are configured to guide the airflow of the outlet to the first air outlet and / or the second air outlet. Each centrifugal fan is provided with a first flow guiding component and a second flow guiding component between it and the third flow guiding component on the same side.

[0032] In some embodiments, the centrifugal fan includes a centrifugal fan blade with a diameter of D, a volute tongue on the bottom wall, a first height h1 between the tip of the volute tongue and the top wall, an outlet of the centrifugal fan formed between the volute tongue and the top wall, a second height h2 between the tip of the volute tongue and the bottom wall, and a total height H between the top wall and the bottom wall.

[0033] Wherein, H / D = 1 to 2, and / or h1 / D = 0.65 to 0.75, and / or h2 / D = 0.7 to 0.9.

[0034] In some embodiments, H / D = 1.55, and / or h1 / D = 0.75, and / or h2 / D = 0.8.

[0035] According to a second aspect of this disclosure, an air conditioning indoor unit is provided, including the air duct assembly of the above embodiments, wherein the air conditioning indoor unit is configured to adopt an upper air outlet state in cooling mode and a lower air outlet state in heating mode.

[0036] According to a third aspect of this disclosure, an air conditioning unit is proposed, including the indoor unit of the above-described embodiments.

[0037] Based on the above technical solution, the indoor unit of the air conditioner in this embodiment adopts a centrifugal fan and, in conjunction with the switching of the state of the first and second flow guiding components, achieves an upward air outlet state or a downward air outlet state. Compared with a fixed air outlet, the air outlet direction can be changed according to actual needs, improving the user experience. Moreover, since the axial dimension of the centrifugal fan is small, the gas flowing out from the outlet can enter an independent reversing duct. The first and second flow guiding components are easy to install in the reversing duct, which simplifies the structure of the first and second flow guiding components, makes the installation more flexible, and makes it easier to ensure strength. In addition, even if there is some resistance when the airflow enters the reversing duct from the outlet or flows in the reversing duct, the centrifugal fan can generate high static pressure, which can still maintain a high pressure when the airflow flows out from the first or second air outlet, thereby achieving a longer air delivery distance. Attached Figure Description

[0038] The accompanying drawings, which are included to provide a further understanding of this disclosure and form part of this application, illustrate exemplary embodiments of this disclosure and are used to explain this disclosure, but do not constitute an undue limitation of this disclosure. In the drawings:

[0039] Figure 1 is a structural schematic diagram of some embodiments of the air duct assembly disclosed herein.

[0040] Figure 2 is a cross-sectional view of some embodiments of the air duct assembly of this disclosure in a cross section perpendicular to a third direction.

[0041] Figure 3 is a schematic diagram of gas flow within the air duct assembly shown in Figure 2.

[0042] Figure 4 is a schematic diagram of the end structure of some embodiments of the air duct assembly of this disclosure.

[0043] Figure 5 is a front view of the reversing air duct in the air duct assembly of this disclosure in the upward air outlet state.

[0044] Figure 6 is a schematic diagram of the gas flow in the top-outlet state shown in Figure 5.

[0045] Figure 7 is a front view of the reversing air duct in the air duct assembly of this disclosure in the downward air outlet state.

[0046] Figure 8 is a schematic diagram of the gas flow in the downward air outlet state shown in Figure 7.

[0047] Figure 9 shows a schematic diagram with the first flow guiding component in the open state and the second flow guiding component in the closed state.

[0048] Explanation of reference numerals in the attached figures

[0049] 1. Shell; 11. Top wall; 12. Bottom wall; 13. Rear wall; 14. Reversing air duct; 15. Side wall; 16. Front wall; 17. Transition wall; 18. Partition; 19. Opening; 10. First air outlet; 20. Second air outlet;

[0050] 2. Centrifugal fan; 21. Outlet; 22. Inlet; 23. Centrifugal fan blade; 24. Volute;

[0051] 3. Heat exchanger;

[0052] 4. Second drive mechanism;

[0053] 5. Connecting shaft;

[0054] 6. First flow guiding assembly; 61. First plate; 62. Connecting rod;

[0055] 7. Second flow guiding component;

[0056] 8. Third flow guide assembly; 81. Second plate; 82. Third plate; 83. Fourth plate;

[0057] x, first direction; y, second direction; z, third direction. Detailed Implementation

[0058] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The descriptions of the exemplary embodiments are merely illustrative and are in no way intended to limit the present disclosure or its application or use. The present disclosure may be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided so that the present disclosure will be thorough and complete, and will fully express the scope of the disclosure to those skilled in the art. It should be noted that, unless specifically stated otherwise, the relative arrangement of components and steps, the composition of materials, numerical expressions, and values ​​set forth in these embodiments should be interpreted as exemplary only and not as limiting.

[0059] The terms "first," "second," and similar words used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different parts. Words such as "including" or "contains" mean that the element preceding the word encompasses the element listed after it, and do not exclude the possibility of encompassing other elements as well. Terms such as "above," "below," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, this relative positional relationship may also change accordingly.

[0060] In this disclosure, when a specific device is described as being located between a first device and a second device, an intermediary device may or may not be present between the specific device and the first or second device. When a specific device is described as being connected to other devices, the specific device may be directly connected to the other devices without an intermediary device, or it may be not directly connected to the other devices but have an intermediary device.

[0061] All terms used in this disclosure (including technical or scientific terms) have the same meaning as understood by one of ordinary skill in the art to which this disclosure pertains, unless otherwise specifically defined. It should also be understood that terms defined in a general dictionary, such as a dictionary, should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and not as having an idealized or highly formalized meaning, unless expressly defined herein.

[0062] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0063] Based on the embodiments disclosed above, in the absence of explicit denial or conflict, the technical features of one embodiment may be advantageously combined with one or more other embodiments.

[0064] First, this disclosure proposes an air duct assembly, as shown in Figures 1 to 9. In some embodiments, the air duct assembly includes:

[0065] The housing 1 has a first air outlet 10 on its top wall 11 and a second air outlet 20 on its bottom wall 12. The housing 1 has a reversing air duct 14 inside, which is connected to the first air outlet 10 and the second air outlet 20.

[0066] Centrifugal fan 2 is housed inside casing 1 and located at the end of casing 1 along the first direction x. The outlet 21 of centrifugal fan 2 is connected to reversing duct 14.

[0067] The first flow guiding component 6 and the second flow guiding component 7 are movably disposed within the reversing air duct 14. The first flow guiding component 6 is configured to connect the outlet 21 and the first air outlet 10 in the open state and to disconnect the connection between the outlet 21 and the first air outlet 10 in the closed state. The second flow guiding component 7 is configured to connect the outlet 21 and the second air outlet 20 in the open state and to disconnect the connection between the outlet 21 and the second air outlet 20 in the closed state.

[0068] When the air duct assembly is in the upper air outlet state, the first air guide component 6 is in the open state and the second air guide component 7 is in the closed state; when the air duct assembly is in the lower air outlet state, the first air guide component 6 is in the closed state and the second air guide component 7 is in the open state.

[0069] Specifically, the housing 1 includes a top wall 11 and a bottom wall 12 spaced apart along a third direction z (e.g., the height direction). The top wall 11 is provided with one or more first air outlets 10, and the bottom wall 12 is provided with one or more second air outlets 20. The housing 1 also includes two side walls 15 spaced apart along a first direction x (e.g., the left-right direction). The side walls 15 are connected between the top wall 11 and the bottom wall 12, and the centrifugal fan 2 is disposed near the inner side of the side wall 15.

[0070] As shown in Figure 4, the centrifugal fan 2 includes a volute assembly and centrifugal impeller 23. The volute assembly includes a volute and a volute tongue 24. The volute includes a front wall 16, a top wall 11 covering the portion of the centrifugal impeller 23, a bottom wall 12 covering the portion of the centrifugal impeller 23, a transition wall 17 connecting the front wall 16 and the top wall 11, and a transition wall 17 connecting the front wall 16 and the bottom wall 12. The front wall 16 and the rear wall 13 are spaced apart along a second direction y. The bottom end of the volute tongue 24 is connected to the bottom wall 12, and the top end of the volute tongue 24 extends toward the top wall 11 and is inclined toward the rear wall 13. An outlet 21 is formed between the volute and the volute tongue 24, and the outlet 21 communicates with a reversing duct 14. Optionally, the reversing duct 14 can be located entirely on one side of the centrifugal fan 2, for example, along the second direction y, which is perpendicular to the first direction x.

[0071] For example, the centrifugal fan blade 23 can be a forward-curved static pressure centrifugal fan blade. When the centrifugal fan blade 23 of the centrifugal fan 2 rotates, the gas flow direction is basically consistent with the rotation direction of the centrifugal fan blade 23, which allows the gas to be compressed and accelerated more effectively, thereby generating higher static pressure. Moreover, due to the higher static pressure, the gas can maintain a higher pressure when flowing out of the outlet 21, thereby obtaining greater kinetic energy at the outlet 21 and achieving a longer air delivery distance.

[0072] The first flow guiding component 6 and the second flow guiding component 7 are movably disposed within the reversing air duct 14. For example, the first flow guiding component 6 and the second flow guiding component 7 may include one or more first plates 61. "Modible" means that the first plate 61 changes its position by moving or rotating, thereby realizing the connection or disconnection of the airflow channel between the outlet 21 and the first air outlet 10 or the second air outlet 20.

[0073] In the upper air outlet state of the air duct assembly, the first guide component 6 is in the open state and the second guide component 7 is in the closed state. The airflow from the outlet 21 of the centrifugal fan 2 enters the reversing air duct 14 and flows towards the upper area of ​​the reversing air duct 14, and is discharged from the first air outlet 10. In the lower air outlet state of the air duct assembly, the first guide component 6 is in the closed state and the second guide component 7 is in the open state. The airflow from the outlet 21 of the centrifugal fan 2 enters the reversing air duct 14 and flows towards the lower area of ​​the reversing air duct 14, and is discharged from the second air outlet 20.

[0074] The duct assembly in this embodiment uses a centrifugal fan 2, and works with the first guide assembly 6 and the second guide assembly 7 to switch between upper and lower air outlet states. Compared with fixed air outlet, the air outlet direction can be changed according to actual needs, improving the user experience. Moreover, since the axial dimension of the centrifugal fan 2 is small, the gas flowing out of the outlet 21 can enter the independent reversing duct 14. The first guide assembly 6 and the second guide assembly 7 are easy to install in the reversing duct 14, which simplifies the structure of the first guide assembly 6 and the second guide assembly 7, making the installation more flexible and easier to ensure strength. In addition, even if there is some resistance when the airflow enters the reversing duct 14 from the outlet 21 or flows in the reversing duct 14, the centrifugal fan 2 can generate high static pressure, which can still maintain a high pressure when the airflow flows out of the first outlet 10 or the second outlet 20, thereby achieving a longer air delivery distance.

[0075] In some embodiments, as shown in Figures 1 and 2, the central axis of the centrifugal fan 2 extends along a first direction x, and the housing 1 has an opening 19 on one side along a second direction y, the second direction y being perpendicular to the first direction x. The duct assembly further includes:

[0076] Heat exchanger 3 is installed at opening 19. Heat exchanger 3 extends along the first direction x and is located on the side of centrifugal fan 2 near its inlet 22. The windward side of heat exchanger 3 faces the outside of housing 1.

[0077] The shell 1 has an opening 19 on its front side, located in the middle region of the shell 1 along the first direction x. The remaining portions on both sides of the shell 1 serve as volutes. The heat exchanger 3 can have a C-shaped structure, including two inclined heat exchange plates. The two inclined heat exchange plates are at an angle and connected by an arc-shaped heat exchange plate, with the angle facing inward towards the shell 1. This type of heat exchanger 3 is beneficial for increasing the heat exchange area.

[0078] In this embodiment, the central axis of the centrifugal fan 2 is arranged along the first direction x, and the heat exchanger 3 extends along the first direction x. The heat exchanger 3 is arranged parallel to the central axis of the centrifugal fan 2, which increases the space of the return air cavity downstream of the heat exchanger 3, making the airflow after heat exchange in the heat exchanger 3 more uniform, thereby improving the uniformity of the outlet air temperature. Moreover, the centrifugal fan 2 discharges air circumferentially, and the airflow will concentrate in the two end areas. By turning the airflow towards the central area, the airflow from the outlet in the first direction x can be made more uniform. In addition, the distance between the inlet 22 of the centrifugal fan 2 and the heat exchanger 3 is relatively far, which can prevent the suction force of the centrifugal fan 2 from causing the local wind speed in the end area of ​​the heat exchanger 3 to be too high, resulting in the return airflow concentrating at both ends of the heat exchanger 3 for heat exchange. This can make the airflow velocity in the heat exchanger 3 uniform along the entire first direction x, improving the heat exchange efficiency. In addition, the centrifugal fan 2 and the heat exchanger 3 are arranged side by side in the first direction x, and the centrifugal fan 2 is the largest size in the second direction y. When the air duct assembly is used for a wall-mounted air conditioner, the thickness of the wall-mounted air conditioner can be reduced.

[0079] In some embodiments, the reversing duct 14 is located inside the housing 1 on the side away from the heat exchanger 3 along the second direction y, and the outlet 21 faces the reversing duct 14.

[0080] For example, the heat exchanger 3 is located on the front side of the shell 1, and the reversing air duct 14 is located on the rear side inside the shell 1. The reversing air duct 14 is entirely located on the rear side of the centrifugal fan 2 along the second direction y. Specifically, as shown in Figure 2, a partition 18 is provided inside the shell 1. The partition 18 extends along the first direction x and is parallel and spaced apart from the rear wall 13. The two ends of the partition 18 are spaced apart from the corresponding side walls 15 to form the outlet 21 of the centrifugal fan 2. The reversing air duct 14 is formed by the top wall 11, the bottom wall 12, the rear wall 13, and the partition 18.

[0081] In this embodiment, the reversing duct 14 is entirely located on the side away from the heat exchanger 3 along the second direction y. This creates a large cavity between the partition 18 of the reversing duct 14 and the heat exchanger 3. After the return airflow passes through the heat exchanger 3 for heat exchange, it enters the centrifugal fan 2 through this cavity. The larger cavity facilitates smoother airflow into the inlet 22 of the centrifugal fan 2, and the return airflow can be fully mixed within this cavity after passing through the heat exchanger 3 to ensure uniform airflow temperature, thus resulting in uniform outlet airflow. Furthermore, the reversing duct 14 has ample space for the first guide assembly 6 and the second guide assembly 7, facilitating the switching of outlet airflow direction and reducing resistance during airflow reversal. Moreover, the reversing duct 14 can achieve vertical airflow switching with a relatively small thickness along the second direction y. When this type of duct assembly is installed in a wall-mounted air conditioner indoor unit, it reduces the thickness of the indoor unit along the second direction y.

[0082] In some embodiments, the first flow guiding component 6 and / or the second flow guiding component 7 include a first plate 61, which is rotatably connected to the housing 1 to switch between an open state and a closed state.

[0083] One or more first plates 61 can be provided. When multiple first plates 61 are provided, the air duct can be connected or disconnected through the combination of multiple first plates 61. The first plate 61 can abut between the partition 18 and the rear wall 13. The rotation axis of the first plate 61 is set along the second direction y. The rotation axis can be set at the end or the middle area of ​​the first plate 61.

[0084] In this embodiment, the first flow guiding component 6 and / or the second flow guiding component 7 are set as plate-shaped structures. The structure is simple, occupies little space, and can provide a large space for the airflow channel. Moreover, the plate-shaped structure is easy to rotate under the control of the drive mechanism, and it is also easy to set an appropriate number of first plates 61 according to actual needs to open or close the airflow channel. It can be adapted to reversing air ducts 14 of different sizes or shapes.

[0085] In some embodiments, as shown in Figures 5 to 8, the first flow guiding component 6 and / or the second flow guiding component 7 include:

[0086] At least two first boards of 61;

[0087] Link 62 connects at least two first plates 61, and in the open state, the rotation axes of link 62 and the first plates 61 are spaced apart; and

[0088] The first drive mechanism is configured to drive the hinge shaft of one of the first plates 61 to rotate, so that the first flow guide assembly 6 or the second flow guide assembly 7 switches between an open state and a closed state.

[0089] In the open state, at least two first plates 61 are arranged in parallel with a gap; in the closed state, at least two first plates 61 are arranged on the same plane and adjacent first plates 61 are connected.

[0090] Specifically, the first flow guiding assembly 6 and the second flow guiding assembly 7 in Figure 5 are each provided with three first plates 61, as shown in Figure 9. A connecting rod 62 is connected to the end of all the first plates 61 near the rear wall 13. The dimension of the connecting rod 62 along the second direction y is smaller than the dimension of the first plate 61 along the second direction y, so the connecting rod 62 will not obstruct the gas flow. Each first plate 61 is rotatably mounted between the rear wall 13 and the partition 18, with the axis of rotation along the second direction y. The axis of rotation can be located in the middle region of the first plate 61 along its own length. This structure can reduce the area occupied by the first plate 61 during rotation.

[0091] The first drive mechanism can be a motor or electric motor, etc. The first drive mechanism can be located on the outside of the rear wall 13, and is used to drive the hinge shaft of any one of the first plates 61 to rotate the first plate 61, and drive all the first plates 61 to rotate synchronously through the connecting rod 62. When the adjacent first plates 61 are arranged in parallel intervals, the first flow guide assembly 6 or the second flow guide assembly 7 is in the open state, allowing airflow to pass between the adjacent first plates 61; when all the first plates 61 rotate to coplanar and the adjacent first plates 61 are connected, the first flow guide assembly 6 or the second flow guide assembly 7 is in the closed state, preventing airflow from passing between the adjacent first plates 61.

[0092] The first airflow guiding component 6 and the second airflow guiding component 7 in this embodiment have a simple structure and can automatically switch the airflow channel between open and closed states. Each first plate 61 has a short length, so the airflow channel can be closed by combining multiple first plates 61. The area occupied by multiple first plates 61 in the reversing air duct 14 during rotation is also small, which can prevent interference with other components in the reversing air duct 14. Moreover, when multiple first plates 61 are in the open state, the airflow can flow between adjacent first plates 61 and on the outside of the two side first plates 61, which can make the airflow more uniform when it flows out from the first air outlet 10 or the second air outlet 20. In addition, when all first plates 61 are rotated to the open state, the angle position of the first plates 61 can be precisely controlled, thereby adjusting the air duct width between adjacent first plates 61 to control the speed of airflow, and adjusting the guiding direction of the first plates 61 to control the direction of airflow, thereby improving user comfort.

[0093] In some embodiments, as shown in Figures 5 to 8, the air duct assembly further includes:

[0094] The third airflow guiding component 8 is fixedly installed in the reversing air duct 14 and is configured to guide the airflow of the outlet 21 to the first air outlet 10 and / or the second air outlet 20.

[0095] For example, the third airflow guiding assembly 8 may include a guide plate disposed between the rear wall 13 and the partition 18 for guiding airflow.

[0096] This embodiment, through the fixed third airflow guide component 8 and the movable first airflow guide component 6 and second airflow guide component 7, can flexibly change the airflow direction to achieve an upward airflow state and a downward airflow state.

[0097] Specifically, as shown in Figure 6, in the upward airflow state, the first guide component 6 is in the open state, and the second guide component 7 is in the closed state. The second guide component 7 and the third guide component 8 together limit the flow direction of the gas flowing out of the outlet 21 of the centrifugal fan 2, causing the overall airflow to rise and flow out near the first air outlet 10 under the action of the first guide component 6. As shown by the arrow, after the gas flows out of the outlet 21, it flows downward as the centrifugal fan blade 23 rotates, then turns and flows upward along the second guide component 7 and the third guide component 8. In this process, although the airflow is subject to certain resistance, due to the large static pressure of the centrifugal fan 2, the airflow velocity in the upward airflow state can still be relatively close to that in the downward airflow state.

[0098] As shown in Figure 8, in the downward air outlet state, the second flow guide component 7 is in the open state and the first flow guide component 6 is in the closed state. The first flow guide component 6 and the third flow guide component 8 together limit the flow direction of the gas flowing out of the outlet 21 of the centrifugal fan 2, so that the airflow is downward and flows out under the action of the second flow guide component 7 near the second air outlet 20.

[0099] In some embodiments, in the closed state, the two ends of the first flow guide component 6 and the second flow guide component 7 respectively abut against the third flow guide component 8 and the housing 1.

[0100] As shown in Figure 5, the second flow guide component 7 is in the closed state, with its two ends abutting between the third flow guide component 8 and the bottom wall 12, respectively. In this state, the second flow guide component 7 separates the outlet 21 of the centrifugal fan 2 from the second air outlet 20, allowing gas to flow only towards the first air outlet 10 after exiting the outlet 21. As shown in Figure 7, the first flow guide component 6 is in the closed state, with its two ends abutting between the third flow guide component 8 and the top wall 11, respectively. In this state, the first flow guide component 6 separates the outlet 21 of the centrifugal fan 2 from the first air outlet 10, allowing gas to flow only towards the second air outlet 20 after exiting the outlet 21.

[0101] In this embodiment, when the first flow guiding component 6 and the second flow guiding component 7 are in the closed state, their respective ends abut against the third flow guiding component 8 and the housing 1, which can conveniently isolate the outlet 21 from one of the air outlets and guide the airflow toward the other air outlet, and reduce the airflow resistance.

[0102] In some embodiments, as shown in FIG5, the third flow guiding assembly 8 includes a second plate 81 and a third plate 82, the first ends of which are respectively connected to the top wall 11 and the bottom wall 12, and the second ends of which form a connection end in the middle region of the reversing air duct 14 along the third direction z, which is perpendicular to the first direction x. Specifically, the third direction z is perpendicular to the first direction x and the second direction y. The second plate 81 and the third plate 82 are inclined, and their second ends are closer to the centrifugal fan 2 in the first direction x than their first ends.

[0103] The third flow guiding component 8 may further include a fourth plate 83, which is connected between the first ends of the second plate 81 and the third plate 82, and extends along the third direction z. This third flow guiding component 8 forms a triangular structure, which has better structural strength.

[0104] In this embodiment, a third airflow guiding component 8 is formed by the second plate 81 and the third plate 82. In the upward airflow state, the second plate 81 can guide the airflow, and the tilt direction of the second plate 81 can ensure that the airflow from the outlet 21 reaches the first air outlet 10 smoothly, reducing airflow resistance. In the downward airflow state, the third plate 82 can guide the airflow, and the tilt direction of the third plate 82 can ensure that the airflow from the outlet 21 reaches the second air outlet 20 smoothly, reducing airflow resistance. In addition, the second ends of the second plate 81 and the third plate 82 are connected in the middle region of the reversing air duct 14 along the third direction z, so that the guiding effect of the third airflow guiding component 8 on the airflow is symmetrical in the upward and downward airflow states.

[0105] In some embodiments, in the closed state, the first end of the first flow guide component 6 or the second flow guide component 7 abuts against the side wall of the reversing duct 14 along the second direction y, and the second end abuts against the connection end.

[0106] Specifically, the first flow guiding assembly 6 and the second flow guiding assembly 7 include: at least two first plates 61; a connecting rod 62 connecting the at least two first plates 61, and in the open state, the connecting rod 62 is spaced apart from the rotation axis of the first plates 61; and a first drive mechanism configured to drive the connecting rod 62 to move along its length direction, so as to switch the first flow guiding assembly 6 or the second flow guiding assembly 7 between an open state and a closed state.

[0107] As shown in Figure 5, in the top air outlet state, at least two first plates 61 in the first airflow guiding component 6 are arranged in parallel and spaced apart, and at least two first plates 61 in the second airflow guiding component 7 are arranged in the same plane to form an integral flat plate. The first end of the integral flat plate abuts against the bottom wall 12, and the second end of the integral flat plate abuts against the connecting end.

[0108] As shown in Figure 7, in the downward air outlet state, at least two first plates 61 in the second airflow guide assembly 7 are arranged in parallel and spaced apart, and at least two first plates 61 in the first airflow guide assembly 6 are arranged coplanarly to form an integral flat plate. The first end of the integral flat plate abuts against the top wall 11, and the second end of the integral flat plate abuts against the connecting end.

[0109] In this embodiment, the contact method of the first flow guiding component 6 or the second flow guiding component 7 in the closed state not only enables the movable flow guiding component in the closed state to form an integral and continuous flow guiding wall with the fixed second plate 81 or third plate 82, reducing the flow loss of airflow, but also allows the entire length of the second plate 81 or third plate 82 to participate in the flow guiding.

[0110] In some embodiments, both the first flow guiding component 6 and the second flow guiding component 7 include a first plate 61, wherein,

[0111] When the first flow guiding component 6 is in the closed state, the first plate 61 and the third plate 82 in the first flow guiding component 6 have the same straight extension direction.

[0112] When the second flow guiding assembly 7 is in the closed state, the first plate 61 and the second plate 81 in the second flow guiding assembly 7 have the same straight extension direction.

[0113] Specifically, if the first plate 61, the second plate 81, or the third plate 82 is an arc-shaped structure, its straight extension direction can be understood as the straight line connecting the two ends.

[0114] In this embodiment, the movable first plate 61 is aligned with the straight extension direction of the second plate 81 or the third plate 82 when it is closed. This allows the first plate 61 to be smoothly connected to the second plate 81 or the third plate 82, forming a continuous and smoothly transitioning guide wall. This further reduces airflow loss and allows the air outlet to reach a longer distance.

[0115] In some embodiments, both the second plate 81 and the third plate 82 are recessed toward each other. For example, the second plate 81 and the third plate 82 may be recessed in an arc shape, such as a circular arc.

[0116] Taking the above air outlet as an example, when the airflow flows from the first plate 61 in the closed state to the second plate 81, if the second plate 81 is designed as an inclined flat plate, the airflow will flow directly out in the direction of inclination along the first direction x, which will affect the forward flow of the air outlet. If centrifugal fans 2 are provided at both ends of the housing 1, the airflows discharged at an inclination from the two first air outlets 10 of the top wall 11 will cross in the middle area and interfere with each other.

[0117] In this embodiment, when the airflow flows along the first plate 61 in its closed state to the second plate 81 or the third plate 82, it flows towards the air outlet along the recessed surface. When the airflow approaches the end of the second plate 81 or the third plate 82, it is discharged from the air outlet in a nearly vertical direction, which can increase the flow path of the air outlet towards the front of the air duct assembly. If centrifugal fans 2 are provided at both ends of the housing 1, the airflow discharged from the two first air outlets 10 of the top wall 11 or the airflow discharged from the two second air outlets 20 of the bottom wall 12 can also avoid mutual interference.

[0118] In some embodiments, as shown in FIG2, there are two centrifugal fans 2, which are respectively located at both ends of the housing 1 along the first direction x. The centrifugal fan 2 includes centrifugal fan blades 23.

[0119] The air duct assembly also includes a second drive mechanism 4, which is connected between the two centrifugal fan blades 23 and is configured to drive the two centrifugal fan blades 23 to rotate synchronously.

[0120] The second drive mechanism 4 may include a power component and may further include a reducer. The second drive mechanism 4 is located in the middle region of the housing 1 along the first direction x, and both ends are provided with output shafts. Both ends of the output shafts are coaxially connected to the centrifugal fan blades 23 on both sides through connecting shafts 5.

[0121] This embodiment, by installing two centrifugal fans 2 at both ends of the housing 1, can generate greater driving force for the return airflow, allowing the airflow to pass through the heat exchanger 3 more smoothly, thereby improving heat exchange efficiency and increasing the outlet air rate. Furthermore, installing centrifugal fans 2 at both ends allows airflow to be introduced into both sides of the reversing duct 14 along the first direction x, ensuring balanced airflow on both sides. This facilitates the installation of a larger first air outlet 10 or second air outlet 20 on the housing 1 along the first direction x, further improving outlet air efficiency.

[0122] In some embodiments, as shown in FIG1, the top wall 11 is provided with two independent first air outlets 10 along the first direction x, and the bottom wall 12 is provided with two independent second air outlets 20 along the first direction x. Each centrifugal fan 2 is provided with a first flow guiding component 6 and a second flow guiding component 7. The outlet 21 of each centrifugal fan 2 can be selectively connected to the first air outlet 10 or the second air outlet 20 on the same side.

[0123] The top wall 11 has two first air outlets 10 arranged side by side along the first direction x, and the bottom wall 12 has two second air outlets 20 arranged side by side along the first direction x. The first air outlets 10 and the second air outlets 20 can be rectangular or other shapes.

[0124] In this embodiment, a first flow guide component 6 and a second flow guide component 7 are provided for each centrifugal fan 2, so that the airflow discharged from the outlet 21 of each centrifugal fan 2 can be independently controlled and the air is discharged from the first air outlet 10 or the second air outlet 20 corresponding to the centrifugal fan 2. This can improve the uniformity of the airflow, and even if the centrifugal fan 2 or its corresponding flow guide component on one side fails, the basic air outlet function of the air duct assembly can still be guaranteed.

[0125] In some embodiments, the air duct assembly further includes two third flow guiding components 8, which are fixedly disposed in the middle region of the reversing air duct 14 along the first direction x, and the two third flow guiding components 8 are symmetrical with respect to the plane perpendicular to the first direction x. The third flow guiding components 8 are configured to guide the airflow of the outlet 21 to the first air outlet 10 and / or the second air outlet 20. Each centrifugal fan 2 is provided with a first flow guiding component 6 and a second flow guiding component 7 between it and the third flow guiding component 8 on the same side.

[0126] As shown in Figure 5, each third flow guide assembly 8 includes a second plate 81, a third plate 82, and a fourth plate 83, forming a triangular structure. Optionally, the second plate 81 and the third plate 82 can be arc-shaped and concave inward. Thus, the outer contours of the two third flow guide assemblies 8 form a rhomboid structure. Each centrifugal fan 2 is provided with a first flow guide assembly 6 and a second flow guide assembly 7 between itself and the third flow guide assembly 8 on the same side. The first flow guide assembly 6 and the second flow guide assembly 7 can be symmetrically arranged with respect to the plane where the connection ends of the two third flow guide assemblies 8 are located.

[0127] In this embodiment, a third flow guiding component 8 is provided for each centrifugal fan 2, ensuring that the airflow from each centrifugal fan 2 is guided to the first air outlet 10 or the second air outlet 20. Furthermore, the symmetrical arrangement of the two third flow guiding components 8 ensures that the airflow areas corresponding to the airflow from the two centrifugal fans 2 are consistent, resulting in uniform airflow from the two first air outlets 10 or the two second air outlets 20. In addition, each third flow guiding component 8 is correspondingly provided with a first flow guiding component 6 and a second flow guiding component 7, allowing for independent control of the airflow from each centrifugal fan 2. The third flow guiding component 8 can cooperate with the first flow guiding component 6 or the second flow guiding component 7 to achieve airflow output.

[0128] In some embodiments, as shown in FIG4, the centrifugal fan 2 includes a centrifugal fan blade 23 with a diameter of D. A volute tongue 24 is provided on the bottom wall 12. The top of the volute tongue 24 has a first height h1 between it and the top wall 11. An outlet 21 of the centrifugal fan 2 is formed between the volute tongue 24 and the top wall 11. The top of the volute tongue 24 has a second height h2 between it and the bottom wall 12. The total height H is between the top wall 11 and the bottom wall 12.

[0129] Wherein, H / D = 1 to 2, and / or h1 / D = 0.65 to 0.75, and / or h2 / D = 0.7 to 0.9.

[0130] Specifically, the centrifugal fan 2 includes a volute assembly and a centrifugal fan blade 23, which can rotate clockwise as shown in Figure 4. The volute assembly includes a volute and a volute tongue 24. The volute includes a front wall 16, a top wall 11 covering the portion of the centrifugal fan blade 23, a bottom wall 12 covering the portion of the centrifugal fan blade 23, a transition wall 17 connecting the front wall 16 and the top wall 11, and a transition wall 17 connecting the front wall 16 and the bottom wall 12. The front wall 16 and the rear wall 13 are spaced apart along a second direction y. The bottom end of the volute tongue 24 is connected to the bottom wall 12, and the top end of the volute tongue 24 extends towards the top wall 11 and slopes towards the rear wall 13. The top end of the volute tongue 24 can be designed as an arc to smoothly guide the airflow and reduce airflow resistance. An outlet 21 is formed between the volute and the volute tongue 24, and the outlet 21 is connected to the reversing duct 14.

[0131] This embodiment takes into account that the structure of outlet 21 is a key factor affecting the efficiency of centrifugal fan 2. If the value of H is too small, the flow loss will be too large. If the value of H is too large, the air cannot be effectively directed. Setting H / D within a reasonable range can reduce the flow loss of centrifugal fan 2 at the air outlet while effectively controlling the air outlet direction.

[0132] Considering that the maximum diffusion cross-section of the volute assembly will significantly affect the air outlet stability, if h1 is too large, it will cause diffusion instability, and if h1 is too small, it will cause the air outlet resistance to increase. Setting h1 / D within a reasonable range will improve the air outlet stability of the centrifugal fan 2 and reduce the air outlet resistance.

[0133] After the centrifugal fan 2 is diffused by the volute assembly, if the diffuser opening is too large, it will cause irregular convergence of the upstream and downstream airflows of the volute assembly, resulting in counter-current surge. A downstream air outlet duct is set at the dividing point of the volute tongue 24. If h2 is too small, the upstream and downstream airflows will easily converge and cause surge. If h2 is too large, the coverage area of ​​the volute tongue 24 on the centrifugal fan blade 23 will be too large, affecting the air outlet. Setting h2 / D within a reasonable range can suppress the surge caused by the convergence of upstream and downstream airflows and effectively increase the air volume of the centrifugal fan 2.

[0134] In some embodiments, H / D = 1.55, and / or h1 / D = 0.75, and / or h2 / D = 0.8.

[0135] In this embodiment, setting H / D = 1.55 allows for a suitable distance between the centrifugal fan blade 23 and the top wall 11, effectively controlling the airflow direction and reducing flow losses at the outlet of the centrifugal fan 2. Setting h1 / D = 0.75 allows the centrifugal fan blade 23 to protrude from the volute tongue 24 at a suitable height, achieving optimal airflow stability and reducing airflow resistance. Setting h2 / D = 0.8 effectively suppresses surge caused by the convergence of upstream and downstream airflows and significantly increases the airflow of the centrifugal fan 2.

[0136] In some specific embodiments, forward static pressure centrifugal fan blades 23 are arranged at both ends of the housing 1 of the air duct assembly along the first direction x, with axial air intake and circumferential air outlet. By setting an outlet 21 extending to the downstream section of the volute tongue 24, the upstream and downstream surge problem of the flow channel in the static pressure volute is suppressed. The diffuser is reasonably set to achieve low-noise and high-efficiency air delivery by the centrifugal fan 2. The reversing air duct 14 is located on the back of the housing 1, and has a guide structure for switching between upper and lower air outlets. It realizes low-loss multi-turn torsional air delivery of the air duct structure and meets the requirements for switching air outlet schemes.

[0137] Secondly, this disclosure provides an air conditioning indoor unit, including the air duct assembly of the above embodiments, wherein the air conditioning indoor unit is configured to adopt an upper air outlet state in cooling mode and a lower air outlet state in heating mode.

[0138] For example, the indoor unit of the air conditioner is a wall-mounted unit. The air inlet of the indoor unit can be located at the front or sides, as long as it can enter the heat exchanger 3 from the front of the air duct assembly.

[0139] Since the air duct assembly disclosed herein can achieve both upward and downward air outlet states, the indoor unit of the air conditioner can switch between the upward air outlet state in cooling mode and the downward air outlet state in heating mode, enabling cold air to blow upward and hot air to blow downward, thereby optimizing the cooling and heating effect and improving user comfort. By setting a first air outlet 10 for cooling mode on the top wall 11 and a second air outlet 20 for heating mode on the bottom wall 12, the height difference of the indoor unit casing 1 can be fully utilized to increase the uniformity of the distribution of cold and hot air during indoor movement. By setting air outlets on the top wall 11 and the bottom wall 12 respectively to achieve upward and downward air outlets, it is not necessary to forcibly guide the airflow at the fan outlet to change the airflow direction, which can reduce airflow impact loss.

[0140] Specifically, by setting a first air outlet 10 on the top wall 11 for cooling mode, the cold air blows upward, avoiding direct airflow onto people. At the same time, by making full use of the height of the indoor unit, the air outlet height of the cold air is raised, allowing the cold air to be more evenly distributed in the room as it descends, circulating fully and creating a shower-like cooling effect, thereby improving the cooling effect and user comfort. By setting a second air outlet 20 on the bottom wall 12 for heating mode, the hot air blows downward, allowing the hot air to be directly delivered to the ground. This allows the hot air to be more evenly distributed in the room as it rises, circulating fully and creating a carpet-like heating effect, thereby improving the heating effect and user comfort.

[0141] Furthermore, this type of air conditioner indoor unit can be flexibly and conveniently controlled by switching the air outlet direction through the cooperation of the first air guide component 6 and the second air guide component 7. Since the first air guide component 6 and the second air guide component 7 have simple structures and are easy to ensure strength, the air outlet stability and service life can be improved. In addition, because the centrifugal fan 2 can generate high static pressure, the airflow maintains a high pressure when flowing out from the first air outlet 10 or the second air outlet 20, enabling the air conditioner indoor unit to achieve a longer air delivery distance and optimize cooling and heating effects.

[0142] Furthermore, this disclosure provides an air conditioning unit, including the indoor unit of the above embodiments.

[0143] The air conditioning unit in this embodiment switches between the upper air outlet state in cooling mode and the lower air outlet state in heating mode through the indoor unit, which can optimize the cooling and heating effect, improve user comfort, and improve energy efficiency.

[0144] The present disclosure provides a detailed description of an indoor air conditioning unit and an air conditioning system. Specific embodiments have been used to illustrate the principles and implementation methods of the present disclosure. These embodiments are merely illustrative and are intended to aid in understanding the method and core concepts of the present disclosure. It should be noted that those skilled in the art can make various improvements and modifications to the present disclosure without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of this disclosure.

Claims

1. A duct assembly, characterized in that, include: A housing (1) has a first air outlet (10) on its top wall (11) and a second air outlet (20) on its bottom wall (12). A reversing air duct (14) is provided inside the housing (1), and the reversing air duct (14) is connected to the first air outlet (10) and the second air outlet (20). A centrifugal fan (2) is provided inside the housing (1) and located at the end of the housing (1) along a first direction (x). The outlet (21) of the centrifugal fan (2) is connected to the reversing air duct (14). A first flow guide assembly (6) and a second flow guide assembly (7) are movably provided inside the reversing air duct (14). The first flow guide assembly (6) is configured to connect to the air outlet in the open state. The outlet (21) and the first air outlet (10) are connected, and the connection between the outlet (21) and the first air outlet (10) is cut off in the closed state. The second flow guide component (7) is configured to connect the outlet (21) and the second air outlet (20) in the open state, and cut off the connection between the outlet (21) and the second air outlet (20) in the closed state. In the upper air outlet state of the air duct component, the first flow guide component (6) is in the open state and the second flow guide component (7) is in the closed state. In the lower air outlet state of the air duct component, the first flow guide component (6) is in the closed state and the second flow guide component (7) is in the open state.

2. The air duct assembly according to claim 1, characterized in that, The central axis of the centrifugal fan (2) extends along the first direction (x), and the housing (1) has an opening (19) on one side along the second direction (y), the second direction (y) being perpendicular to the first direction (x). The air duct assembly further includes a heat exchanger (3) installed in the opening (19). The heat exchanger (3) extends along the first direction (x) and is located on the side of the centrifugal fan (2) near its inlet (22). The windward side of the heat exchanger (3) faces outward from the housing (1).

3. The air duct assembly according to claim 2, characterized in that, The reversing duct (14) is located inside the housing (1) on the side away from the heat exchanger (3) along the second direction (y), and the outlet (21) faces the reversing duct (14).

4. The air duct assembly according to claim 1, characterized in that, The first flow guiding assembly (6) and / or the second flow guiding assembly (7) includes a first plate (61) rotatably connected to the housing (1) to switch between the open state and the closed state.

5. The air duct assembly according to claim 4, characterized in that, The first flow guiding assembly (6) and / or the second flow guiding assembly (7) includes: at least two first plates (61); a connecting rod (62) connecting the at least two first plates (61), wherein in the open state, the connecting rod (62) is spaced apart from the rotation axis of the first plate (61); and a first drive mechanism configured to drive the hinge axis of one of the first plates (61) to rotate, thereby switching the first flow guiding assembly (6) or the second flow guiding assembly (7) between the open state and the closed state; wherein, in the open state, the at least two first plates (61) are arranged in parallel and spaced apart; and in the closed state, the at least two first plates (61) are arranged coplanarly and adjacent first plates (61) are abutted.

6. The air duct assembly according to claim 1, characterized in that, Also includes: The third airflow guiding component (8) is fixedly disposed in the reversing air duct (14) and is configured to guide the airflow of the outlet (21) to the first air outlet (10) and / or the second air outlet (20).

7. The air duct assembly according to claim 6, characterized in that, In the closed state, the two ends of the first flow guide component (6) and the second flow guide component (7) respectively abut against the third flow guide component (8) and the housing (1).

8. The air duct assembly according to claim 6, characterized in that, The third flow guiding component (8) includes a second plate (81) and a third plate (82), the first ends of which are respectively connected to the top wall (11) and the bottom wall (12), and the second ends of which form a connection end in the middle region of the reversing air duct (14) along the third direction (z), the third direction (z) being perpendicular to the first direction (x); the second plate (81) and the third plate (82) are inclined, and the second ends of which are closer to the centrifugal fan (2) in the first direction (x) than the first ends.

9. The air duct assembly according to claim 8, characterized in that, In the closed state, the first end of the first flow guide component (6) or the second flow guide component (7) abuts against the side wall of the reversing duct (14) along the second direction (y), and the second end abuts against the connecting end.

10. The air duct assembly according to claim 9, characterized in that, Both the first flow guiding component (6) and the second flow guiding component (7) include a first plate (61). When the first flow guiding component (6) is in the closed state, the first plate (61) in the first flow guiding component (6) has the same straight extension direction as the third plate (82). When the second flow guiding component (7) is in the closed state, the first plate (61) in the second flow guiding component (7) has the same straight extension direction as the second plate (81).

11. The air duct assembly according to claim 8, characterized in that, The second plate (81) and the third plate (82) are both recessed toward each other.

12. The air duct assembly according to any one of claims 1 to 11, characterized in that, Two centrifugal fans (2) are provided, and the two centrifugal fans (2) are respectively located at both ends of the housing (1) along the first direction (x). The centrifugal fan (2) includes centrifugal fan blades (23). The air duct assembly also includes a second drive mechanism (4) connected between the two centrifugal fan blades (23) and configured to drive the two centrifugal fan blades (23) to rotate synchronously.

13. The air duct assembly according to claim 12, characterized in that, The top wall (11) is provided with two independent first air outlets (10) along the first direction (x), and the bottom wall (12) is provided with two independent second air outlets (20) along the first direction (x). Each centrifugal fan (2) is provided with a first flow guide component (6) and a second flow guide component (7). The outlet (21) of each centrifugal fan (2) can be selectively connected to the first air outlet (10) or the second air outlet (20) on the same side.

14. The air duct assembly according to claim 12, characterized in that, It also includes two third flow guiding components (8), which are fixedly disposed in the middle region of the reversing air duct (14) along the first direction (x), and the two third flow guiding components (8) are symmetrical with respect to the plane perpendicular to the first direction (x). The third flow guiding components (8) are configured to guide the airflow of the outlet (21) to the first air outlet (10) and / or the second air outlet (20). Each centrifugal fan (2) is provided with the first flow guiding component (6) and the second flow guiding component (7) on the same side of the third flow guiding component (8).

15. The air duct assembly according to any one of claims 1 to 11, characterized in that, The centrifugal fan (2) includes a centrifugal fan blade (23) with a diameter of D. A volute tongue (24) is provided on the bottom wall (12). The top of the volute tongue (24) and the top wall (11) have a first height h1. The outlet (21) of the centrifugal fan (2) is formed between the volute tongue (24) and the top wall (11). The top of the volute tongue (24) and the bottom wall (12) have a second height h2. The top wall (11) and the bottom wall (12) have a total height H. Wherein, H / D = 1 to 2, and / or h1 / D = 0.65 to 0.75, and / or h2 / D = 0.7 to 0.

9.

16. The air duct assembly according to claim 15, characterized in that, H / D = 1.55, and / or h1 / D = 0.75, and / or h2 / D = 0.

8.

17. An indoor unit for an air conditioner, characterized in that, Including the air duct assembly according to any one of claims 1 to 16, the indoor unit of the air conditioner is configured to use the upper air outlet state in cooling mode and the lower air outlet state in heating mode.

18. An air conditioning unit, characterized in that, Including the air conditioning indoor unit as described in claims 1 to 17.

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