Air duct assembly and air conditioner having the same

Abstract

The present invention provides an air duct assembly and an air conditioner having the same, wherein the air duct assembly includes a shell, a primary mixed flow fan blade, a secondary mixed flow fan blade, a motor mounting plate and a secondary guide vane, the shell has a flow cavity and a first air port and a second air port connected to the flow cavity, the flow cavity includes a first flow sub-cavity and a second flow sub-cavity connected in the direction from the first air port to the second air port; the shell forms a constriction structure at the connection between the first flow sub-cavity and the second flow sub-cavity, and the constriction structure is close to the second air port relative to the bottom end of the secondary mixed flow fan blade. The present invention solves the problem that the shell structure of the air duct assembly of the air conditioner in the prior art is unreasonable, resulting in the mixed flow fan blade being able to only absorb air axially, and the air suction capacity of the air duct assembly is poor, which is not conducive to the mixed flow fan blade to work on a sufficient amount of airflow, thereby reducing the air outlet performance of the air duct assembly, resulting in poor cooling or heating effects of the air conditioner.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to an air duct component of an air conditioner. Background Art

[0002] As a household appliance, the air conditioner can deliver cool air to users in hot weather and warm air to users in cold weather, which greatly improves the quality of life of users. It is increasingly favored by consumers and has been widely used.

[0003] The air conditioner includes an outer shell and an air duct assembly arranged in the outer shell. The air duct assembly includes a shell and a mixed flow fan blade located in the shell. However, the shell structure of the existing air duct assembly is unreasonable, which causes the mixed flow fan blade to only absorb air axially. Its air suction capacity is poor, which is not conducive to the mixed flow fan blade to work on a sufficient amount of airflow, thereby reducing the air outlet performance of the air duct assembly, resulting in poor cooling or heating effects of the air conditioner, reducing the practicability of the air conditioner, and affecting the user's experience. Summary of the invention

[0004] The main purpose of the present invention is to provide an air duct assembly and an air conditioner having the same, so as to solve the problem that the shell structure of the air duct assembly of the air conditioner in the prior art is unreasonable, which causes the mixed flow fan blade to only absorb air axially. Since the air suction capacity of the air duct assembly is poor, it is not conducive to the mixed flow fan blade to work on a sufficient amount of airflow, thereby reducing the air outlet performance of the air duct assembly, resulting in poor cooling or heating effect of the air conditioner, reducing the practicability of the air conditioner, and affecting the user's usage experience.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an air duct assembly, comprising a shell, a first-level mixed flow fan blade and a second-level mixed flow fan blade, wherein the shell has a flow cavity and a first air port and a second air port connected to the flow cavity, wherein the flow cavity includes a first-level flow sub-cavity and a second-level flow sub-cavity connected in a direction from the first air port to the second air port; the first-level mixed flow fan blade and the second-level mixed flow fan blade are both rotatably arranged in the flow cavity, and the first-level mixed flow fan blade and the second-level mixed flow fan blade are arranged in sequence at intervals in a direction from the first air port to the second air port; the shell forms a necking structure at the connecting point between the first-level flow sub-cavity and the second-level flow sub-cavity, and the necking structure is close to the second air port relative to the bottom end of the second-level mixed flow fan blade.

[0006] Furthermore, the first-level mixed flow fan blade is arranged in the first-level flow sub-cavity, and the second-level mixed flow fan blade is arranged through the first-level flow sub-cavity and the second-level flow sub-cavity.

[0007] Furthermore, the shell is a rotating body structure, the first air outlet and the second air outlet are respectively located at two ends of the axis of the shell, and the first-stage mixed flow fan blade and the second-stage mixed flow fan blade rotate around the axis of the shell.

[0008] Further, the first sub-shell segment has a first air port and a primary flow sub-cavity, and the cross-sectional area of ​​the primary flow sub-cavity first gradually increases and then gradually decreases in the direction away from the first air port; the second sub-shell segment is connected to the first sub-shell segment, and the second sub-shell segment has a second air port and a secondary flow sub-cavity, and the cross-sectional area of ​​the secondary flow sub-cavity first gradually increases and then gradually decreases in the direction close to the second air port; the necking structure is formed at the connection between the first sub-shell segment and the second sub-shell segment.

[0009] Furthermore, the cross sections of the primary flow sub-cavity and the secondary flow sub-cavity are both circular, and the inner wall surface of the primary flow sub-cavity and the inner wall surface of the secondary flow sub-cavity are smoothly transitioned.

[0010] Furthermore, the air duct assembly also includes a motor mounting plate, the motor mounting plate includes a motor mounting portion, a guide cover structure and a first-level guide vane, the motor mounting portion is connected to the first sub-shell segment, the guide groove structure is connected to the motor mounting portion and is located in the first-level flow sub-cavity, the first-level guide vane is connected to the motor mounting portion and is located in the first-level flow sub-cavity, and the first-level guide vane is located on the outer peripheral side of the guide groove structure, and the guide cover structure is located between the first-level mixed flow blade and the second-level mixed flow blade.

[0011] Furthermore, the air duct assembly also includes a secondary guide vane, which is arranged in the secondary flow sub-cavity and located on a side of the secondary mixed flow blade close to the second air outlet.

[0012] Further, the first-stage mixed flow blade and the second-stage mixed flow blade rotate along the first direction so that the first air outlet is the air inlet and the second air outlet is the air outlet.

[0013] Furthermore, the air duct assembly also includes a motor shaft, and the first-stage mixed flow blade and the second-stage mixed flow blade are connected through the motor shaft to achieve synchronous rotation of the two.

[0014] According to another aspect of the present invention, an air conditioner is provided, comprising a housing and an air duct assembly arranged in the housing, wherein the air duct assembly is the above-mentioned air duct assembly.

[0015] By applying the technical solution of the present invention, the position of the tapered structure of the shell of the air duct assembly is reasonably optimized so that the tapered structure is close to the second air outlet relative to the bottom end of the secondary mixed flow blade. In this way, the gap between the outer peripheral edge of the secondary mixed flow blade and the inner wall surface of the secondary flow sub-cavity in its radial direction is effectively increased, so that a larger inlet space is formed at this position, so that at the bottom end of the secondary mixed flow blade, the airflow can enter the secondary mixed flow blade along the axial direction of the secondary mixed flow blade, and a part of the airflow can use the inlet space to enter the secondary mixed flow blade along the radial direction of the secondary mixed flow blade. Therefore, the secondary mixed flow blade has both axial suction and radial suction capabilities, which greatly improves the suction capacity of the air duct assembly, ensures that the secondary mixed flow blade stably works on a sufficient amount of airflow, so as to increase the air output and air output intensity of the air duct assembly, thereby ensuring that the air conditioner can meet the cooling or heating air volume requirements of the user, improves the practicality of the air conditioner, and increases the user's usage experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 A schematic front view of an air duct assembly according to an optional embodiment of the present invention is shown;

[0018] Figure 2 Shows Figure 1 A schematic diagram of the internal structure of the air duct assembly in a cross-sectional state;

[0019] Figure 3 Shows Figure 1 Schematic diagram of the three-dimensional structure of the air duct component.

[0020] The above drawings include the following reference numerals:

[0021] 10. Shell; 11. Flow chamber; 12. First air outlet; 13. Second air outlet; 111. Primary flow sub-chamber; 112. Secondary flow sub-chamber; 20. Primary mixed flow fan blade; 30. Secondary mixed flow fan blade; 100. Narrowing structure; 101. First sub-shell section; 102. Second sub-shell section; 70. Motor mounting plate; 71. Motor mounting part; 72. Air guide cover structure; 73. Primary guide vane; 50. Secondary guide vane; 60. Motor shaft. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In order to solve the problem that the shell structure of the air duct assembly of the air conditioner in the prior art is unreasonable, which causes the mixed flow fan blade to only absorb air axially, and the air suction capacity of the air duct assembly is poor, which is not conducive to the mixed flow fan blade to work on a sufficient amount of airflow, thereby reducing the air outlet performance of the air duct assembly, resulting in poor cooling or heating effects of the air conditioner, reducing the practicality of the air conditioner, and affecting the user's usage experience, the present invention provides a duct assembly and an air conditioner, wherein the air conditioner includes an outer shell and an air duct assembly arranged in the outer shell, and the air duct assembly is the above-mentioned or following air duct assembly.

[0024] It should be noted that in the illustrated embodiment of the present application, Figure 2 The direction indicated by the arrow A is the first direction described below.

[0025] like Figures 1 to 3 As shown, the air duct assembly includes a shell 10, a first-level mixed flow fan blade 20 and a second-level mixed flow fan blade 30, wherein the shell 10 has a flow cavity 11 and a first air port 12 and a second air port 13 connected to the flow cavity 11, wherein the flow cavity 11 includes a first-level flow sub-cavity 111 and a second-level flow sub-cavity 112 connected in a direction from the first air port 12 to the second air port 13; both are rotatably arranged in the flow cavity 11, and the first-level mixed flow fan blade 20 and the second-level mixed flow fan blade 30 are arranged in sequence from the first air port 12 to the second air port 13; the shell 10 forms a shrinkage structure 100 at the connection point between the first-level flow sub-cavity 111 and the second-level flow sub-cavity 112, and the shrinkage structure 100 is close to the second air port 13 relative to the bottom end of the second-level mixed flow fan blade 30.

[0026] By rationally optimizing the position of the constriction structure 100 of the shell 10 of the air duct assembly, the constriction structure 100 is made closer to the second air port 13 relative to the bottom end of the secondary mixed flow blade 30, so that the gap between the outer periphery of the secondary mixed flow blade 30 and the inner wall surface of the secondary flow sub-cavity 112 in the radial direction is effectively increased, so that a larger inflow space is formed at this position, so that at the bottom end position of the secondary mixed flow blade 30, the airflow can enter the secondary mixed flow blade 30 along the axial direction of the secondary mixed flow blade 30. , and a part of the airflow can utilize the inlet space to enter the secondary mixed flow fan blade 30 along the radial direction of the secondary mixed flow fan blade 30. Therefore, the secondary mixed flow fan blade 30 has both axial suction and radial suction capabilities, which greatly improves the suction capacity of the air duct component, ensures that the secondary mixed flow fan blade 30 stably works on a sufficient amount of airflow, so as to increase the air output and air output intensity of the air duct component, thereby ensuring that the air conditioner can meet the cooling or heating air volume requirements of the user, improves the practicality of the air conditioner, and increases the user's usage experience.

[0027] like Figure 2 As shown, the first-level mixed flow fan blade 20 is arranged in the first-level flow sub-cavity 111 and is located at the position of the first air outlet 12, and the second-level mixed flow fan blade 30 is arranged through the first-level flow sub-cavity 111 and the second-level flow sub-cavity 112. In this way, by reasonably optimizing the specific setting positions of the first-level mixed flow fan blade 20 and the second-level mixed flow fan blade 30 in the flow cavity 11, it is not only beneficial to utilize the internal space of the flow cavity 11, but also can accurately control the specific position where the airflow is worked when flowing through the flow cavity 11, so as to achieve the maximum work on the airflow in a limited space, so as to improve the air outlet strength of the air duct assembly. After the airflow enters the flow cavity 11, it passes through the first-level mixed flow fan blade 20 and the second-level mixed flow fan blade 30 in sequence. The first-level mixed flow fan blade 20 and the second-level mixed flow fan blade 30 respectively work on the airflow, ensuring that the airflow has the ability to overcome greater resistance, improving the air outlet of the air duct assembly, and ensuring that the air conditioner can achieve the preset cooling or heating effect.

[0028] like Figures 1 to 3As shown, the shell 10 is a rotating body structure, the first air outlet 12 and the second air outlet 13 are respectively located at the two ends of the axis of the shell 10, and the first mixed flow blade 20 and the second mixed flow blade 30 rotate around the axis of the shell 10. In this way, the shell 10 is a rotating body structure, which is not only easy to manufacture, but also can effectively guide the airflow, and is conducive to reducing the resistance loss along the way when the airflow flows through the flow cavity 11 of the shell 10, so as to reduce the energy loss of the airflow; in addition, the first mixed flow blade 20 and the second mixed flow blade 30 rotate around the axis of the shell 10, so that the gap between the outer peripheral side of the first mixed flow blade 20 and the second mixed flow blade 30 and the inner wall surface of the shell 10 is equal everywhere along the circumference of the shell 10, so that the intensity of the airflow after the first mixed flow blade 20 and the second mixed flow blade 30 do work on the air outlet surface is evenly distributed, which is more conducive to improving the user experience.

[0029] like Figures 1 to 3 As shown, a first sub-shell segment 101 has a first air port 12 and a primary flow sub-cavity 111, and a cavity cross-sectional area of ​​the primary flow sub-cavity 111 gradually increases and then gradually decreases in a direction away from the first air port 12; a second sub-shell segment 102 is connected to the first sub-shell segment 101, and the second sub-shell segment 102 has a second air port 13 and a secondary flow sub-cavity 112, and a cavity cross-sectional area of ​​the secondary flow sub-cavity 112 gradually increases and then gradually decreases in a direction close to the second air port 13; a necking structure 100 is formed at the connection between the first sub-shell segment 101 and the second sub-shell segment 102. In this way, by optimizing the specific structural form of the shell 10, the cavity shapes of the primary flow sub-cavity 111 and the secondary flow sub-cavity 112 are accurately improved, which is conducive to the smooth flow of the airflow through the flow cavity 11, wherein the cavity cross-sectional area of ​​the primary flow sub-cavity 111 gradually increases and then gradually decreases in the direction away from the first air outlet 12, so that after the flow velocity of the airflow entering the primary flow sub-cavity 111 is instantly reduced, the energy is continuously accumulated under the work action of the primary mixed flow impeller 20, and the flow velocity when flowing out of the primary flow sub-cavity 111 is increased to the predetermined value. Assuming a value, similarly, the cross-sectional area of ​​the secondary flow sub-cavity 112 gradually increases and then gradually decreases in the direction close to the second air outlet 13, which also greatly improves the energy of the airflow, so that the airflow has a large speed and strong kinetic energy after flowing out of the shell 10; it should also be noted that the cavity shape of the above-mentioned primary flow sub-cavity 111 and the secondary flow sub-cavity 112 is also conducive to the installation of the primary mixed flow fan blade 20 and the secondary mixed flow fan blade 30, providing a highly adaptable installation space for the two, so as to ensure that the air duct assembly has a regular overall structure.

[0030] It should be noted that, in the present application, the cross-sections of the primary flow sub-cavity 111 and the secondary flow sub-cavity 112 are both circular, and the inner wall surface of the primary flow sub-cavity 111 and the inner wall surface of the secondary flow sub-cavity 112 are smoothly transitioned. In this way, the inner wall surfaces of the primary flow sub-cavity 111 and the secondary flow sub-cavity 112, both of which have circular cross-sections, have little obstruction to the airflow passing through, which is more conducive to the smooth flow of the airflow; similarly, the smooth transition of the inner wall surface of the primary flow sub-cavity 111 and the inner wall surface of the secondary flow sub-cavity 112 also greatly reduces the obstruction to the airflow, which is conducive to the smooth flow of the airflow through the flow cavity 11, and improves the air outlet efficiency of the air duct assembly.

[0031] like Figures 1 to 3 As shown, the air duct assembly also includes a motor mounting plate 70, the motor mounting plate 70 includes a motor mounting portion 71, a guide cover structure 72 and a first-level guide vane 73, the motor mounting portion is connected to the first sub-housing segment 101, the guide cover structure 72 is connected to the motor mounting portion 71 and is located in the first-level flow sub-cavity 111, the first-level guide vane 73 is connected to the motor mounting portion and is located in the first-level flow sub-cavity 111, and the first-level guide vane is located on the outer peripheral side of the guide cover, and the guide cover structure 72 is located between the first-level mixed flow fan blade 20 and the second-level mixed flow fan blade 30. In this way, the guide cover structure 72 guides the airflow entering the first-level flow sub-cavity 111, ensures that the airflow in the first-level flow sub-cavity 111 flows along the guide channel formed by the guide cover structure 72, and avoids the airflow from being dispersed, disturbed and collided after the first-level mixed flow fan blade 20 does work.

[0032] like Figure 2 As shown, the air duct assembly further includes a secondary guide vane 50, which is disposed in the secondary flow sub-cavity 112 and located on the side of the secondary mixed flow blade 30 close to the second air outlet 13. In this way, the secondary guide vane 50 guides the airflow entering the secondary flow sub-cavity 112 and after the secondary mixed flow blade 30 does work, ensuring that the airflow in the secondary flow sub-cavity 112 flows along the guide channel formed by the secondary guide vane 50, and avoiding dispersion, turbulence and collision of the airflow after the secondary mixed flow blade 30 does work.

[0033] It should be noted that in the present application, the opening area of ​​the first air outlet 12 is greater than or equal to the opening area of ​​the second air outlet 13, and the first-level mixed flow blade 20 and the second-level mixed flow blade 30 rotate along the first direction so that the first air outlet 12 is the air inlet and the second air outlet 13 is the air outlet. In this way, during the operation of the air conditioner, when the first-level mixed flow blades 20 and the second-level mixed flow blades 30 rotate along the first direction, the airflow enters the first-level flow sub-chamber 111 from the first air outlet 12, and the first-level mixed flow blades 20 in the first-level flow sub-chamber 111 perform work on the airflow once, and the airflow after the first work smoothly enters the second-level flow sub-chamber 112 under the guidance of the guide cover structure 72. It should be noted that the airflow after the first work enters the second-level flow sub-chamber 112 under the guidance of the work of the second-level mixed flow blades 30, and the second-level mixed flow blades 30 perform a second work on the airflow, and the airflow after the second work is blown out from the second air outlet 13 under the guidance of the secondary guide vanes 50, which effectively increases the air outlet volume of the second air outlet 13 of the air duct assembly, so that the air conditioner achieves the preset cooling effect, ensures the practicality of the air conditioner, and improves the user's usage experience.

[0034] It should be noted that the air duct assembly in the present application is used in the cooling mode of the air conditioner, and the installation method of the air duct assembly in the housing of the air conditioner is also the same as Figures 1 to 3 In the form of, that is, the first air outlet 12 is the lower air inlet, and the second air outlet 13 is the upper air outlet, so that the cold air will be blown out of the air conditioner from the second air outlet 13 at a high position, so that the cold air can quickly cool the entire space in a sinking manner, so as to enhance the cooling capacity of the air conditioner and improve the practicality of the air conditioner.

[0035] like Figure 2 As shown, the air duct assembly further includes a motor shaft 60, and the primary mixed flow blade 20 and the secondary mixed flow blade 30 are connected through the motor shaft 60 to achieve synchronous rotation of the two. In this way, after the airflow passes through the primary mixed flow blade 20 and the secondary mixed flow blade 30, the uniformity of the wind speed is ensured, and the comfort of the user is improved.

[0036] It should be noted that in the present application, the first-stage mixed flow blades 20 and the second-stage mixed flow blades 30 are installed in the same direction, that is, the first-stage mixed flow blades 20 and the second-stage mixed flow blades 30 are installed in an axially spaced manner in the flow cavity 11, so that the work done by the first-stage mixed flow blades 20 or the second-stage mixed flow blades 30 on the airflow can be reliably superimposed, thereby improving the air outlet effect of the air duct assembly.

[0037] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0039] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0040] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0041] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air duct assembly, characterized in that: include: A housing (10), the housing (10) comprising a flow chamber (11) and a first air port (12) and a second air port (13) connected to the flow chamber (11), wherein the flow chamber (11) comprises a first-level flow sub-chamber (111) and a second-level flow sub-chamber (112) connected to each other in a direction from the first air port (12) to the second air port (13); A first-stage mixed flow blade (20) and a second-stage mixed flow blade (30), both of which are rotatably arranged in the flow cavity (11), and the first-stage mixed flow blade (20) and the second-stage mixed flow blade (30) are arranged in sequence and spaced apart in a direction from the first air outlet (12) to the second air outlet (13); The shell (10) forms a constriction structure (100) at the connection point between the primary flow sub-cavity (111) and the secondary flow sub-cavity (112), and the constriction structure (100) is close to the second air outlet (13) relative to the bottom end of the secondary mixed flow blade (30).

2. The air duct assembly according to claim 1, characterized in that: The first-level mixed flow blade (20) is arranged in the first-level flow sub-cavity (111), and the second-level mixed flow blade (30) is arranged through the first-level flow sub-cavity (111) and the second-level flow sub-cavity (112).

3. The air duct assembly according to claim 1, characterized in that: The shell (10) is a rotating body structure, the first air outlet (12) and the second air outlet (13) are respectively located at two ends of the axis of the shell (10), and the first mixed flow blade (20) and the second mixed flow blade (30) rotate around the axis of the shell (10).

4. The air duct assembly according to any one of claims 1 to 3, characterized in that: a first sub-shell segment (101), the first sub-shell segment (101) having the first air port (12) and the first-level flow sub-cavity (111), the cavity cross-sectional area of ​​the first-level flow sub-cavity (111) first gradually increases and then gradually decreases in a direction away from the first air port (12); a second sub-shell segment (102) connected to the first sub-shell segment (101), the second sub-shell segment (102) having the second air port (13) and the secondary flow sub-cavity (112), the cavity cross-sectional area of ​​the secondary flow sub-cavity (112) gradually increasing and then gradually decreasing in a direction approaching the second air port (13); The necking structure (100) is formed at the connection between the first sub-shell segment (101) and the second sub-shell segment (102).

5. The air duct assembly according to claim 4, characterized in that: The cross sections of the primary flow sub-cavity (111) and the secondary flow sub-cavity (112) are both circular, and the inner wall surface of the primary flow sub-cavity (111) and the inner wall surface of the secondary flow sub-cavity (112) are smoothly transitioned.

6. The air duct assembly according to claim 4, characterized in that: The air duct assembly further comprises a motor mounting plate (70), wherein the motor mounting plate (70) comprises a motor mounting portion (71), a flow guide cover structure (72) and a first-level guide vane (73); the motor mounting portion (71) is connected to the first sub-housing segment (101); the flow guide cover structure (72) is connected to the motor mounting portion (71) and is located in the first-level flow sub-cavity (111); the first-level guide vane (73) is connected to the motor mounting portion (71) and is located in the first-level flow sub-cavity (111); the first-level guide vane (73) is located on the outer peripheral side of the flow guide cover structure (72); and the flow guide cover structure (72) is located between the first-level mixed flow blade (20) and the second-level mixed flow blade (30).

7. The air duct assembly according to claim 4, characterized in that: The air duct assembly further comprises a secondary guide vane (50), wherein the secondary guide vane (50) is arranged in the secondary flow sub-cavity (112) and is located on a side of the secondary mixed flow blade (30) close to the second air outlet (13).

8. The air duct assembly according to claim 1, characterized in that: The first-level mixed flow blade (20) and the second-level mixed flow blade (30) rotate in a first direction so that the first air outlet (12) is an air inlet and the second air outlet (13) is an air outlet.

9. The air duct assembly according to claim 1, characterized in that: The air duct assembly further comprises a motor shaft (60), and the first-stage mixed flow blade (20) and the second-stage mixed flow blade (30) are connected via the motor shaft (60) to achieve synchronous rotation of the two.

10. An air conditioner, characterized in that: The invention comprises a housing and an air duct assembly arranged in the housing, wherein the air duct assembly is the air duct assembly according to any one of claims 1 to 9.

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