Air duct assembly and cabinet type air conditioner indoor unit

Abstract

The present invention provides an air duct assembly and a cabinet air conditioner indoor unit, belonging to the technical field of ventilation equipment. The air duct assembly comprises an inner shell, wherein an upper air duct, at least two upper air blade cavities, at least two lower air blade cavities and a lower air duct are formed inside the inner shell; an inner shell upper air inlet, an upper return air inlet, an upper air blade cavity inlet, a lower air return air inlet and an inner shell lower air inlet are formed on the shell wall of the inner shell, an upper air blade cavity outlet is formed in the upper air blade cavity, and a lower air blade cavity outlet is formed in the lower air blade cavity; when the upper air shielding structure opens the upper return air inlet and closes the upper air blade cavity outlet at the same time, and the lower air shielding structure closes the lower return air inlet and opens the lower air blade cavity outlet at the same time, the air duct assembly is in an upper air inlet and lower air outlet mode; when the upper air shielding structure closes the upper return air inlet and opens the upper air blade cavity outlet at the same time, and the lower air shielding structure opens the lower return air inlet and closes the lower air blade cavity outlet at the same time, the air duct assembly is in a lower air inlet and upper air outlet mode; the air supply volume of the air duct assembly is increased, the air supply range is expanded, and the air supply distance is extended.

Description

Technical Field

[0001] The invention belongs to the technical field of ventilation equipment, and in particular relates to an air duct component and a cabinet-type air-conditioning indoor unit. Background Art

[0002] The existing ventilation equipment includes a shell, an upper air outlet is formed on the upper part of the shell, a lower air outlet is formed on the lower part of the shell, and a first air duct and a second air duct connecting the upper air outlet and the lower air outlet are formed inside the shell; an upper fan is arranged in the first air duct, and the upper fan rotates to realize air intake from the upper air outlet and air outlet from the lower air outlet; a lower fan is arranged in the second air duct, and the lower fan rotates to realize air intake from the lower air outlet and air outlet from the upper air outlet; the two fans work alone, the air supply volume is small and the air pressure is low, and long-distance and large-range air supply cannot be realized. Summary of the invention

[0003] In view of this, the present invention provides an air duct assembly and a cabinet air conditioner indoor unit to solve the problems in the prior art that two fans work independently, the air supply volume is small and the air pressure is low, and long-distance and large-range air supply cannot be achieved.

[0004] The present invention provides an air duct assembly, comprising an inner shell, wherein the upper end of the shell wall of the inner shell is formed with an inner shell upper air port, and the lower end is formed with an inner shell lower air port; the inner shell is provided with an upper air duct, an upper cavity, a lower cavity and a lower air duct arranged in sequence from top to bottom;

[0005] The upper cavity is divided into at least two upper wind blade cavities; the shell wall of the inner shell is formed with an upper wind blade cavity inlet at a position corresponding to each of the upper wind blade cavities, and each of the upper wind blade cavities is formed with an upper wind blade cavity outlet at one end close to the upper wind duct; one end of the upper wind duct is connected to the upper wind port of the inner shell, and the other end of the upper wind duct is connected to all of the upper wind blade cavity outlets; the shell wall of the inner shell is formed with an upper return air port at a position corresponding to the upper wind duct; an upper wind shielding structure is movably provided at the upper return air port, and the upper wind shielding structure can open the upper return air port and close all of the upper wind blade cavity outlets at the same time, or close the upper return air port and open all of the upper wind blade cavity outlets at the same time;

[0006] The lower cavity is divided into at least two downwind blade cavities; a downwind blade cavity inlet is formed on the shell wall of the inner shell at a position corresponding to each of the downwind blade cavities, and a downwind blade cavity outlet is formed on one end of each of the downwind blade cavities close to the downwind duct; one end of the downwind duct is connected to the downwind outlet of the inner shell, and the other end of the downwind duct is connected to all of the downwind blade cavity outlets; a lower return air outlet is formed on the shell wall of the inner shell at a position corresponding to the downwind duct; a lower wind shielding structure is movably provided at the lower return air outlet, and the lower wind shielding structure can open the lower return air outlet and close all of the downwind blade cavity outlets at the same time, or close the lower return air outlet and open all of the downwind blade cavity outlets at the same time;

[0007] At least two of all the upper wind blade cavities are rotatably provided with upper wind blades, and at least two of all the lower wind blade cavities are rotatably provided with lower wind blades.

[0008] Further optionally, the air duct assembly further comprises a shell; the upper end of the shell wall of the shell is formed with a shell upper air port, and the lower end is formed with a shell lower air port; the interior of the shell forms a shell cavity; the inner shell is arranged in the shell cavity, and the upper air port of the inner shell is connected to the upper air port of the shell, and the lower air port of the inner shell is connected to the lower air port of the shell; the upper air blade cavity inlet and the lower air blade cavity inlet are both connected to the shell cavity;

[0009] When the upper wind shielding structure opens the upper return air inlet and closes all the upper wind blade cavity outlets at the same time, the upper air duct and the shell cavity are connected through the upper return air inlet, and the upper air duct and all the upper wind blade cavities are not connected; when the upper wind shielding structure closes the upper return air inlet and opens all the upper wind blade cavity outlets at the same time, the upper air duct and the shell cavity are not connected, and the upper air duct and each of the upper wind blade cavities are connected through the corresponding upper wind blade cavity outlet;

[0010] When the lower wind shielding structure opens the lower return air inlet and simultaneously closes all the lower wind blade cavity outlets, the downwind duct and the outer shell cavity are connected through the lower return air inlet, and the downwind duct and all the lower wind blade cavities are not connected; when the lower wind shielding structure closes the lower return air inlet and simultaneously opens all the lower wind blade cavity outlets, the downwind duct and the outer shell cavity are not connected, and the downwind duct and each lower wind blade cavity are connected through the corresponding lower wind blade cavity outlet.

[0011] Further optionally, the air duct assembly is provided with an upper air inlet and lower air outlet mode and a lower air inlet and upper air outlet mode;

[0012] When the upper wind shielding structure opens the upper return air inlet and closes all the upper wind blade cavity outlets, and the lower wind shielding structure closes the lower return air inlet and opens all the lower wind blade cavity outlets, at least two of all the lower wind blades rotate, and the air duct assembly can be in the upper air inlet and lower air outlet mode;

[0013] When the upper wind shield structure closes the upper return air outlet and opens all the upper wind blade cavity outlets, and the lower wind shield structure opens the lower return air outlet and closes all the lower wind blade cavity outlets, at least two of all the upper wind blades rotate, and the air duct assembly can be in the lower air inlet and upper air outlet mode.

[0014] Further optionally, an upper air inlet of the shell is formed at the upper end of the shell wall, and a lower air inlet of the shell is formed at the lower end; the upper air inlet of the shell is located at the rear side of the upper air inlet of the shell, and the lower air inlet of the shell is located at the rear side of the lower air inlet of the shell; the upper air inlet of the shell and the lower air inlet of the shell are both connected to the environment where the shell is located and the shell cavity;

[0015] When the air duct assembly is in the upper air inlet and lower air outlet mode and the lower air inlet and upper air outlet mode, air in the environment where the shell is located can enter the shell cavity through the upper air inlet and the lower air inlet of the shell.

[0016] Further optionally, the air duct assembly is also provided with a mode of simultaneously discharging air from top to bottom;

[0017] When the upper wind shield structure closes the upper return air outlet and opens all the upper wind blade cavity outlets, and the lower wind shield structure closes the lower return air outlet and opens all the lower wind blade cavity outlets, at least two of all the lower wind blades are rotated, and at least two of all the upper wind blades are rotated, the air duct assembly can be in the upper and lower simultaneous air outlet mode.

[0018] Further optionally, the shell wall of the shell includes a shell top wall, a shell bottom wall, a shell front wall and a shell rear wall, the shell top wall and the shell bottom wall are arranged opposite to each other up and down, the shell top wall is formed with the shell upper air outlet and the shell upper air inlet, and the shell bottom wall is formed with the shell lower air inlet; the shell front wall and the shell rear wall are arranged opposite to each other front and back, and the shell front wall and the shell rear wall are both connected between the shell top wall and the shell bottom wall, and the shell front wall is formed with the shell lower air outlet;

[0019] The shell wall of the inner shell includes an inner shell rear wall corresponding to the outer shell rear wall, the inner shell rear wall is formed with the upper return air outlet at a position corresponding to the upper air duct, and the inner shell rear wall is formed with the lower return air outlet at a position corresponding to the lower air duct.

[0020] Further optionally, the shell further comprises a chassis and a left shell wall and a right shell wall which are arranged opposite to each other on the left and right sides, and the left shell wall, the front shell wall, the right shell wall and the rear shell wall are sequentially connected and enclosed with the top shell wall, the bottom shell wall and the chassis to form the shell cavity;

[0021] The shell wall of the inner shell includes an inner shell left wall corresponding to the outer shell left wall and an inner shell right wall corresponding to the outer shell right wall, the inner shell left wall and the inner shell right wall are both formed with the upper wind blade cavity inlet at the corresponding position of each of the upper wind blade cavities, and the inner shell left wall and the inner shell right wall are both formed with the lower wind blade cavity inlet at the corresponding position of each of the lower wind blade cavities.

[0022] Further optionally, the air duct assembly further includes an upper ventilation frame and a lower ventilation frame, the upper ventilation frame is arranged above the inner shell and located in the outer shell cavity, the upper ventilation frame is formed with an upper ventilation duct, and the upper ventilation duct connects the upper air outlet of the outer shell and the upper air outlet of the inner shell;

[0023] The lower ventilation frame is arranged below the inner shell and is located in the outer shell cavity. The lower ventilation frame forms a lower ventilation duct, and the lower ventilation duct connects the lower air outlet of the outer shell and the lower air outlet of the inner shell.

[0024] Further optionally, an upper volute tongue is provided in the upper cavity, and the upper volute tongue divides the upper cavity into two upper wind blade cavities; the volume of one of the upper wind blade cavities is larger than the volume of the other upper wind blade cavity, and the upper wind blade cavity with a larger volume is located above and in front of the upper wind blade cavity with a smaller volume;

[0025] A lower volute tongue is arranged in the lower cavity, and the lower volute tongue divides the lower cavity into two lower wind blade cavities; the volume of one lower wind blade cavity is larger than the volume of the other lower wind blade cavity, and the lower wind blade cavity with a larger volume is located in front and below the lower wind blade cavity with a smaller volume.

[0026] The present invention also provides a cabinet air conditioner indoor unit, comprising an indoor heat exchanger and any one of the above-mentioned air duct components, wherein the indoor heat exchanger is arranged on the air inlet side of the upper wind blade cavity inlet and the lower wind blade cavity inlet.

[0027] Compared with the prior art, the beneficial effects of the present invention are mainly:

[0028] When the upper wind shielding structure opens the upper return air inlet and closes all the upper wind blade cavity outlets at the same time, and the lower wind shielding structure closes the lower return air inlet and opens all the lower wind blade cavity outlets at the same time, at least two of all the lower wind blades rotate, and the air duct assembly can be in an upper air inlet and lower air outlet mode; when the upper wind shielding structure closes the upper return air inlet and opens all the upper wind blade cavity outlets at the same time, and the lower wind shielding structure opens the lower return air inlet and closes all the lower wind blade cavity outlets at the same time, at least two of all the upper wind blades rotate, and the air duct assembly can be in a lower air inlet and upper air outlet mode;

[0029] The air supply volume of the air duct component is increased, the air supply range is expanded, and the air supply distance is extended, solving the problem in the prior art that two fans work alone, the air supply volume is small and the air pressure is low, and long-distance and wide-range air supply cannot be achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0031] The structures, proportions, sizes, etc. illustrated in this specification are only used to match the contents disclosed in the specification so as to facilitate understanding and reading by persons familiar with the technology. They are not used to limit the conditions under which the present invention can be implemented, and therefore have no substantial technical significance. Any structural modification, change in proportion or adjustment of size shall still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0032] Figure 1a and Figure 1b A schematic diagram of the external structure of an embodiment of the air duct assembly provided by the present invention;

[0033] Figure 1c A schematic diagram of the internal structure of an embodiment of the air duct assembly provided by the present invention;

[0034] Figure 2a A schematic diagram of the assembly structure of an embodiment of a cabinet-type air-conditioner indoor unit provided by the present invention;

[0035] Figure 2b A schematic diagram of the exploded structure of an embodiment of a cabinet-type air-conditioner indoor unit provided by the present invention;

[0036] Figure 2c A schematic diagram of the structure of an embodiment of the cabinet air conditioner indoor unit provided by the present invention at the air inlet on the housing;

[0037] Figure 2d A schematic diagram of the structure of an embodiment of the cabinet air conditioner indoor unit provided by the present invention at the air inlet under the casing;

[0038] Figure 3 A schematic structural diagram of an embodiment of the cabinet air conditioner indoor unit provided by the present invention when the indoor unit is in an upper air intake and lower air outlet mode;

[0039] Figure 4 A schematic diagram of the structure of an embodiment of the cabinet air conditioner indoor unit provided by the present invention when the indoor unit is in a bottom air intake and top air outlet mode;

[0040] Figure 5 A schematic diagram of the structure of an embodiment of the cabinet air conditioner indoor unit provided by the present invention when the indoor unit is in a mode of simultaneously discharging air from top to bottom;

[0041] In the figure:

[0042] 1-inner shell; 11-upper air outlet of inner shell; 12-lower air outlet of inner shell; 13-upper air duct; 131-upper return air outlet; 132-upper wind shield structure; 14-lower air duct; 141-lower return air outlet; 142-lower wind shield structure; 15-upper air blade cavity; 151-upper air blade cavity inlet; 152-upper air blade cavity outlet; 153-upper air blade; 154-upper volute tongue; 16-lower air blade cavity; 161-lower air blade cavity inlet; 162-lower air blade cavity outlet; 163-lower air blade; 164-lower volute tongue; 171-rear wall of inner shell; 172-left wall of inner shell; 173-right wall of inner shell;

[0043] 2-housing; 21-housing top wall; 211-housing upper air outlet; 212-housing upper air inlet; 22-housing bottom wall; 221-housing lower air inlet; 23-housing front wall; 231-housing lower air outlet; 24-housing rear wall; 25-housing left wall; 26-housing right wall; 27-partition; 28-housing cavity; 29-chassis;

[0044] 31-upper ventilation frame; 311-upper ventilation duct; 32-lower ventilation frame; 321-lower ventilation duct;

[0045] 4-indoor heat exchanger; 41-left heat exchanger; 411-upper left heat exchange section; 412-lower left heat exchange section; 42-right heat exchanger; 421-upper right heat exchange section; 422-lower right heat exchange section. DETAILED DESCRIPTION

[0046] The following is a description of the implementation of the present invention by specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two, but does not exclude the inclusion of at least one.

[0048] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0049] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such a product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0050] The existing ventilation device includes a shell, an upper air port is formed at the upper part of the shell, a lower air port is formed at the lower part of the shell, and a first air duct and a second air duct are formed inside the shell to connect the upper air port and the lower air port; an upper fan is arranged in the first air duct, and the upper fan rotates to realize air intake from the upper air port and air outlet from the lower air port; a lower fan is arranged in the second air duct, and the lower fan rotates to realize air intake from the lower air port and air outlet from the upper air port; the two fans work alone, the air supply volume is small and the air pressure is low, and air supply over a long distance and a large range cannot be realized;

[0051] The present invention creatively provides an air duct assembly, comprising an inner shell, wherein the shell wall of the inner shell is formed with an inner shell upper air port and an inner shell lower air port; the inner shell is formed with an upper air duct, an upper cavity, a lower cavity and a lower air duct; the upper cavity is divided into at least two upper air blade cavities; the shell wall of the inner shell is formed with an upper air blade cavity inlet corresponding to the upper air blade cavity and an upper return air port corresponding to the upper air duct, and each upper air blade cavity is formed with an upper air blade cavity outlet; one end of the upper air duct is connected to the upper air port of the inner shell, and the other end is connected to all the upper air blade cavity outlets; an upper wind shielding structure is movably provided at the upper return air port;

[0052] The lower cavity is divided into at least two lower wind blade cavities; the shell wall of the inner shell is formed with a lower wind blade cavity inlet corresponding to the lower wind blade cavity and a lower return air outlet corresponding to the lower wind duct, and each lower wind blade cavity is formed with a lower wind blade cavity outlet; one end of the lower wind duct is connected to the lower wind outlet of the inner shell, and the other end of the lower wind duct is connected to all the lower wind blade cavity outlets; a lower wind shielding structure is movably provided at the lower return air outlet;

[0053] At least two of all the upper wind blade cavities are rotatably provided with upper wind blades, and at least two of all the lower wind blade cavities are rotatably provided with lower wind blades;

[0054] When the upper wind shield structure opens the upper return air inlet and simultaneously closes all the upper wind blade cavity outlets, and when the lower wind shield structure closes the lower return air inlet and simultaneously opens all the lower wind blade cavity outlets, at least two of all the lower wind blades are rotated, and the air duct assembly can be in an upper air inlet and lower air outlet mode; when the upper wind shield structure closes the upper return air inlet and simultaneously opens all the upper wind blade cavity outlets, and when the lower wind shield structure opens the lower return air inlet and simultaneously closes all the lower wind blade cavity outlets, at least two of all the upper wind blades are rotated, and the air duct assembly can be in a lower air inlet and upper air outlet mode; the air supply volume of the air duct assembly is increased, and the air supply distance is extended.

[0055] like Figures 1a to 5 As shown, this embodiment provides an air duct assembly, including an inner shell 1, an inner shell upper air port 11 is formed at the upper end of the shell wall of the inner shell 1, and an inner shell lower air port 12 is formed at the lower end; an upper air duct 13, an upper cavity, a lower cavity and a lower air duct 14 are formed inside the inner shell 1 in sequence from top to bottom;

[0056] The upper cavity is divided into at least two upper wind blade cavities 15; the shell wall of the inner shell 1 is formed with an upper wind blade cavity inlet 151 at a position corresponding to each upper wind blade cavity 15, and each upper wind blade cavity 15 is formed with an upper wind blade cavity outlet 152 at one end close to the upper wind duct 13; one end of the upper wind duct 13 is connected to the upper wind port 11 of the inner shell, and the other end of the upper wind duct 13 is connected to all the upper wind blade cavity outlets 152; the shell wall of the inner shell 1 is formed with an upper return air port 131 at a position corresponding to the upper wind duct 13; an upper wind shielding structure 132 is movably provided at the upper return air port 131, and the upper wind shielding structure 132 can open the upper return air port 131 and close all the upper wind blade cavity outlets 152 at the same time, or close the upper return air port 131 and open all the upper wind blade cavity outlets 152 at the same time;

[0057] The lower cavity is divided into at least two lower wind blade cavities 16; the shell wall of the inner shell 1 is formed with a lower wind blade cavity inlet 161 at a position corresponding to each lower wind blade cavity 16, and each lower wind blade cavity 16 is formed with a lower wind blade cavity outlet 162 at one end close to the lower wind duct 14; one end of the lower wind duct 14 is connected to the lower wind port 12 of the inner shell, and the other end of the lower wind duct 14 is connected to all the lower wind blade cavity outlets 162; the shell wall of the inner shell 1 is formed with a lower return air port 141 at a position corresponding to the lower wind duct 14; a lower wind shielding structure 142 is movably provided at the lower return air port 141, and the lower wind shielding structure 142 can open the lower return air port 141 and close all the lower wind blade cavity outlets 162 at the same time, or close the lower return air port 141 and open all the lower wind blade cavity outlets 162 at the same time;

[0058] At least two of all the upper wind blade cavities 15 are rotatably provided with upper wind blades 153, and each upper wind blade 153 can rotate independently; at least two of all the lower wind blade cavities 16 are rotatably provided with lower wind blades 163, and each lower wind blade 163 can rotate independently; preferably, the upper wind blades 153 and the lower wind blades 163 are centrifugal wind blades.

[0059] In this embodiment, the upper cavity is divided into two upper wind blade cavities 15, and the two upper wind blade cavities 15 are arranged opposite to each other front and back and staggered up and down; the two upper wind blade cavities 15 are centrifugal cavities, and upper wind blade cavity inlets 151 are formed on both axial sides of the upper wind blade cavity 15, and an upper wind blade cavity outlet 152 is formed at the upper end of the upper wind blade cavity 15;

[0060] The lower cavity is divided into two lower blade cavities 16, which are arranged front and rear opposite to each other and staggered up and down; both lower blade cavities 16 are centrifugal cavities, and lower blade cavity inlets 161 are formed on both axial sides of the lower blade cavity 16, and lower blade cavity outlets 162 are formed at the lower ends of the lower blade cavity 16;

[0061] Specifically, an upper volute tongue 154 is provided in the upper cavity, and the upper volute tongue 154 divides the upper cavity into two upper wind blade cavities 15; the volume of one upper wind blade cavity 15 is larger than the volume of the other upper wind blade cavity 15, and the power of the upper wind blade in the upper wind blade cavity 15 with a larger volume is smaller than the power of the upper wind blade in the upper wind blade cavity 15 with a smaller volume;

[0062] The positions of the large upper wind blade chamber 15 and the small upper wind blade chamber 15 are interchangeable; preferably, the large upper wind blade chamber 15 is located above and in front of the small upper wind blade chamber 15;

[0063] A lower volute tongue 164 is provided in the lower cavity, and the lower volute tongue 164 divides the lower cavity into two lower blade cavities 16; the volume of one lower blade cavity 16 is larger than the volume of the other lower blade cavity 16, and the power of the lower blade in the lower blade cavity 16 with a larger volume is smaller than the power of the lower blade in the lower blade cavity 16 with a smaller volume;

[0064] The positions of the large downwind blade cavity 16 and the small downwind blade cavity 16 are interchangeable; preferably, the large downwind blade cavity 16 is located in the front and lower part of the small downwind blade cavity 16;

[0065] The upper wind blade cavity 15 with a large volume is not connected to the lower wind blade cavity 16 with a large volume, and the upper wind blade cavity 15 with a small volume is arranged close to the lower wind blade cavity 16 with a small volume.

[0066] Preferably, the upper wind shielding structure 132 is an upper baffle, which is rotatably arranged at the upper return air outlet 131, and is driven by an upper driving motor; when the upper baffle rotates toward the upper wind blade cavity outlet 152, the upper return air outlet 131 can be opened while all the upper wind blade cavity outlets 152 are closed; when the upper baffle rotates toward the upper return air outlet 131, the upper return air outlet 131 can be closed while all the upper wind blade cavity outlets 152 are opened;

[0067] The lower wind shielding structure 142 is a lower baffle, which is rotatably arranged at the lower return air outlet 141 and driven by a lower driving motor; when the lower baffle rotates toward the lower wind blade cavity outlet 162, the lower return air outlet 141 can be opened and all the lower wind blade cavity outlets 162 can be closed at the same time; when the lower baffle rotates toward the lower return air outlet 141, the lower return air outlet 141 can be closed and all the lower wind blade cavity outlets 162 can be opened at the same time.

[0068] It should be noted that the inner shell 1 can be integrally formed, and the inner shell 1 includes a volute and a volute cover, and the volute and the volute cover are buckled together to form an upper air duct 13, an upper cavity, a lower cavity and a lower air duct 14 arranged in sequence from top to bottom; the inner shell 1 can also be separately formed, and the inner shell 1 includes an upper inner shell and a lower inner shell, and the upper inner shell and the lower inner shell are detachably connected; the interior of the upper inner shell is formed with an upper air duct 13 and an upper cavity arranged in sequence from top to bottom, and the interior of the lower inner shell is formed with a lower air duct 14 and a lower cavity arranged in sequence from bottom to top; the upper cavity and the lower cavity are arranged close to each other; preferably, the inner shell 1 is integrally formed.

[0069] Further, the air duct assembly also includes a shell 2; the upper end of the shell wall of the shell 2 is formed with a shell upper air port 211, and the lower end is formed with a shell lower air port 231; the interior of the shell 2 is formed with a shell cavity 28; the inner shell 1 is arranged in the shell cavity 28, and the inner shell upper air port 11 is connected to the shell upper air port 211, and the inner shell lower air port 12 is connected to the shell lower air port 231; the upper air blade cavity inlet 151 and the lower air blade cavity inlet 161 are both connected to the shell cavity 28; specifically, an upper air guide plate is rotatably provided at the upper air port 211 of the shell, and the upper air guide plate can open or close the upper air port 211 of the shell, adjust the flow area of ​​the upper air port 211 of the shell, and adjust the air outlet direction of the upper air port 211 of the shell;

[0070] When the upper wind shielding structure 132 opens the upper return air port 131 and closes all the upper wind blade cavity outlets 152 at the same time, the upper air duct 13 and the shell cavity 28 are connected through the upper return air port 131, and the upper air duct 13 and all the upper wind blade cavities 15 are not connected, then the air in the upper air duct 13 can enter the shell cavity 28 through the upper return air port 131; when the upper wind shielding structure 132 closes the upper return air port 131 and opens all the upper wind blade cavity outlets 152 at the same time, the upper air duct 13 and the shell cavity 28 are not connected, and the upper air duct 13 and each upper wind blade cavity 15 are connected through the corresponding upper wind blade cavity outlet 152, then the air in each upper wind blade cavity 15 can enter the upper air duct 13 through the corresponding upper wind blade cavity outlet 152;

[0071] When the lower wind shielding structure 142 opens the lower return air port 141 and closes all the lower wind blade cavity outlets 162 at the same time, the downwind duct 14 and the outer shell cavity 28 are connected through the lower return air port 141, and the downwind duct 14 and all the downwind blade cavities 16 are not connected, then the air in the downwind duct 14 can enter the outer shell cavity 28 through the lower return air port 141; when the lower wind shielding structure 142 closes the lower return air port 141 and opens all the downwind blade cavity outlets 162 at the same time, the downwind duct 14 and the outer shell cavity 28 are not connected, and the downwind duct 14 and each downwind blade cavity 16 are connected through the corresponding downwind blade cavity outlet 162, then the air in each downwind blade cavity 16 can enter the downwind duct 14 through the corresponding downwind blade cavity outlet 162.

[0072] Thus, the air duct assembly is provided with an upper air inlet and a lower air outlet mode and a lower air inlet and an upper air outlet mode;

[0073] When the upper wind shielding structure 132 opens the upper return air port 131 and closes all the upper wind blade cavity outlets 152, and the lower wind shielding structure 142 closes the lower return air port 141 and opens all the lower wind blade cavity outlets 162, at least two of all the lower wind blades 163 rotate, and the air duct assembly can be in an upper air inlet and lower air outlet mode; the air in the environment where the outer shell 2 is located can flow through the upper air port 211 of the outer shell and the upper air port 11 of the inner shell in turn and enter the upper air duct 13, then enter the outer shell cavity 28 through the upper return air port 131, and then enter the corresponding lower wind blade cavity 16 through the lower wind blade cavity inlet 161, and then be discharged to the environment where the outer shell 2 is located through the lower air duct 14, the lower air port 12 of the inner shell and the lower air port 231 of the outer shell;

[0074] Preferably, when the air duct assembly is in the upper air intake and lower air outlet mode, all the lower wind blades 163 rotate, thereby increasing the air supply volume, improving the air supply pressure, and realizing long-distance air supply;

[0075] When the upper wind shielding structure 132 closes the upper return air outlet 131 and opens all the upper wind blade cavity outlets 152 at the same time, and the lower wind shielding structure 142 opens the lower return air outlet 141 and closes all the lower wind blade cavity outlets 162 at the same time, at least two of all the upper wind blades 153 rotate, and the air duct assembly can be in a lower air inlet and upper air outlet mode; the air in the environment where the outer shell 2 is located can flow through the lower air outlet 231 of the outer shell and the lower air outlet 12 of the inner shell in turn and enter the lower air duct 14, then enter the outer shell cavity 28 through the lower return air outlet 141, and then enter the corresponding upper wind blade cavity 15 through the upper wind blade cavity inlet 151, and then pass through the upper air duct 13, the upper air outlet 11 of the inner shell and the upper air outlet 211 of the outer shell and then be discharged to the environment where the outer shell 2 is located;

[0076] Preferably, when the air duct assembly is in a bottom-inlet and top-outlet mode, all the upper wind blades 153 rotate, thereby increasing the air supply volume, improving the air supply pressure, and achieving long-distance air supply.

[0077] The present embodiment further proposes that an upper air inlet 212 is formed at the upper end of the shell wall of the shell 2, and a lower air inlet 221 is formed at the lower end; the upper air inlet 212 is located at the rear side of the upper air inlet 211, and the lower air inlet 221 is located at the rear side of the lower air inlet 231; the upper air inlet 212 and the lower air inlet 221 are both connected to the environment where the shell 2 is located and the shell cavity 28; the environment where the shell 2 is located can be indoors;

[0078] When the air duct assembly is in the upper air inlet and lower air outlet mode or the lower air inlet and upper air outlet mode, the air in the environment where the housing 2 is located can enter the housing cavity 28 through the upper housing air inlet 212 and the lower housing air inlet 221; the air intake volume is increased and the temperature difference of the air in the environment where the housing 2 is located in the height direction is reduced;

[0079] Therefore, the air duct assembly is also provided with a method of simultaneously discharging air from top to bottom;

[0080] When the upper wind shielding structure 132 closes the upper return air outlet 131 and opens all the upper wind blade cavity outlets 152 at the same time, and the lower wind shielding structure 142 closes the lower return air outlet 141 and opens all the lower wind blade cavity outlets 162 at the same time, at least two of all the lower wind blades 163 are rotated, and at least two of all the upper wind blades 153 are rotated, and the air duct assembly can be in a simultaneous upper and lower air outlet mode; the air in the environment where the outer shell 2 is located can enter the outer shell cavity 28 through the upper air inlet 212 of the outer shell and the lower air inlet 221 of the outer shell, and a part of the air in the outer shell cavity 28 enters the corresponding upper wind blade cavity 15 through the upper wind blade cavity inlet 151, and then is discharged to the environment where the outer shell 2 is located through the upper air duct 13, the upper air outlet 11 of the inner shell and the upper air outlet 211 of the outer shell; another part of the air in the outer shell cavity 28 enters the corresponding lower wind blade cavity 16 through the lower wind blade cavity inlet 161, and then is discharged to the environment where the outer shell 2 is located through the lower air duct 14, the lower air outlet 12 of the inner shell and the lower air outlet 231 of the outer shell;

[0081] Preferably, all the upwind blades 153 rotate, and all the downwind blades 163 rotate.

[0082] Further, the shell wall of the shell 2 includes a shell top wall 21, a shell bottom wall 22, a shell front wall 23 and a shell rear wall 24, and the shell top wall 21 and the shell bottom wall 22 are arranged opposite to each other up and down; the shell top wall 21 is formed with a shell upper air outlet 211 and a shell upper air inlet 212, and the shell bottom wall 22 is formed with a shell lower air inlet 221; the shell front wall 23 and the shell rear wall 24 are arranged opposite to each other front and back, and the shell front wall 23 and the shell rear wall 24 are both connected between the shell top wall 21 and the shell bottom wall 22, and the shell front wall 23 is formed with a shell lower air outlet 231;

[0083] Specifically, a partition 27 is arranged above the top wall 21 of the outer shell, and the partition 27 separates the upper air port 211 of the outer shell from the upper air inlet 212 of the outer shell, so as to prevent a short circuit in the air path between the upper air port 211 of the outer shell and the upper air inlet 212 of the outer shell when air is discharged from the upper air port 211 of the outer shell and air is taken in by the upper air inlet 212 of the outer shell; the partition 27 includes a first guide surface and a second guide surface which are arranged opposite to each other, the first guide surface is arranged close to the upper air inlet 212 of the outer shell, and the first guide surface is used to make the air in the environment where the outer shell 2 is located enter the outer shell cavity 28 through the upper air inlet 212 of the outer shell; the second guide surface is arranged close to the upper air port 211 of the outer shell, and the second guide surface is used to make the air in the upper air duct 13 be discharged to the environment where the outer shell 2 is located through the upper air port 211 of the outer shell.

[0084] The shell wall of the inner shell 1 includes an inner shell rear wall 171 corresponding to the outer shell rear wall 24, and the inner shell rear wall 171 is formed with an upper return air port 131 at a position corresponding to the upper air duct 13, and the inner shell rear wall 171 is formed with a lower return air port 141 at a position corresponding to the lower air duct 14;

[0085] The housing 2 further includes a chassis 29 and a left housing wall 25 and a right housing wall 26 which are arranged opposite to each other. The left housing wall 25, the front housing wall 23, the right housing wall 26 and the rear housing wall 24 are sequentially connected and enclosed with the housing top wall 21, the housing bottom wall 22 and the chassis 29 to form a housing cavity 28.

[0086] The shell wall of the inner shell 1 also includes an inner shell left wall 172 corresponding to the outer shell left wall 25 and an inner shell right wall 173 corresponding to the outer shell right wall 26. The inner shell left wall 172 and the inner shell right wall 173 are each formed with an upper wind blade cavity inlet 151 at a corresponding position to each upper wind blade cavity 15, and the inner shell left wall 172 and the inner shell right wall 173 are each formed with a lower wind blade cavity inlet 161 at a corresponding position to each lower wind blade cavity 16.

[0087] The present embodiment further proposes that the air duct assembly further includes an upper ventilation frame 31 and a lower ventilation frame 32. The upper ventilation frame 31 is arranged above the inner shell 1 and located in the outer shell cavity 28. The upper ventilation frame 31 forms an upper ventilation duct 311, and the upper ventilation duct 311 communicates with the upper air outlet 211 of the outer shell and the upper air outlet 11 of the inner shell.

[0088] The lower ventilation frame 32 is disposed below the inner shell 1 and is located in the outer shell cavity 28. The lower ventilation frame 32 forms a lower ventilation duct 321, and the lower ventilation duct 321 communicates with the lower air outlet 231 of the outer shell and the lower air outlet 12 of the inner shell.

[0089] When the air duct assembly is in the upper air inlet and lower air outlet mode, the air in the lower air duct 14 can flow through the lower air outlet 12 of the inner shell, the lower air duct 321 and the lower air outlet 231 of the outer shell in sequence and then be discharged to the environment where the outer shell 2 is located;

[0090] When the air duct assembly is in the lower air inlet and upper air outlet mode, the air in the upper air duct 13 can flow through the upper air port 11 of the inner shell, the upper air duct 311 and the upper air port 211 of the outer shell in sequence and then be discharged to the environment where the outer shell 2 is located.

[0091] This embodiment further provides a cabinet air conditioner indoor unit, comprising an indoor heat exchanger 4 and any of the above-mentioned air duct components, wherein the indoor heat exchanger 4 is arranged at the air inlet side of the upper air blade cavity inlet 151 and the lower air blade cavity inlet 161; specifically, two indoor heat exchangers 4 are provided, and the two indoor heat exchangers 4 are respectively a left heat exchanger 41 and a right heat exchanger 42, the left heat exchanger 41 is arranged between the left wall 25 of the outer shell and the left wall 172 of the inner shell, and the right heat exchanger 42 is arranged between the right wall 26 of the outer shell and the right wall 173 of the inner shell;

[0092] The left heat exchanger 41 is a plate heat exchanger and includes an upper left heat exchange section 411 and a lower left heat exchange section 412; the upper left heat exchange section 411 extends toward the upper air duct 13, and the upper left heat exchange section 411 is arranged corresponding to the upper air blade chamber inlet 151 on the axial side of the upper air blade chamber 15; the lower left heat exchange section 412 extends toward the lower air duct 14, and the lower left heat exchange section 412 is arranged corresponding to the lower air blade chamber inlet 161 on the axial side of the lower air blade chamber 16; the upper left heat exchange section 411 is arranged above the lower left heat exchange section 412, and satisfies: 90°≤ɑ≤180°;

[0093] The right heat exchanger 42 is a plate heat exchanger and includes an upper right heat exchange section 421 and a lower right heat exchange section 422; the upper right heat exchange section 421 extends toward the upper air duct 13, and the upper right heat exchange section 421 is arranged corresponding to the upper air blade chamber inlet 151 on the other side of the upper air blade chamber 15 axially; the lower right heat exchange section 422 extends toward the lower air duct 14, and the lower right heat exchange section 422 is arranged corresponding to the lower air blade chamber inlet 161 on the other side of the lower air blade chamber 16 axially; the upper right heat exchange section 421 is arranged above the lower right heat exchange section 422, and satisfies: 90°≤β≤180°;

[0094] Wherein, α is the angle between the heat exchange surface of the upper left heat exchange section 411 and the heat exchange surface of the lower left heat exchange section 412, and β is the angle between the heat exchange surface of the upper right heat exchange section 421 and the heat exchange surface of the lower right heat exchange section 422;

[0095] The space between the air duct assembly and the shell 2 is fully utilized, the structure of the left heat exchanger 41 and the right heat exchanger 42 is optimized, and the heat exchange area of ​​the left heat exchanger 41 and the right heat exchanger 42 is increased, so that the air in the shell cavity 28 can complete sufficient heat exchange with the left heat exchanger 41 and the right heat exchanger 42, so that the room where the cabinet indoor unit is located can quickly reach the set temperature, thereby improving the comfort of the air outlet of the cabinet air conditioner indoor unit.

[0096] The cabinet air-conditioning indoor unit in this embodiment can realize up and down reversible air supply, with large air supply volume and long air supply distance; taking the upper cavity being divided into two upper air blade cavities 15 and the lower cavity being divided into two lower air blade cavities 16 as an example, the small upper air blade cavity 15 and the small lower air blade cavity 16 shorten the vertical distance, ensure that the temperature difference at the air inlet position on the indoor heat exchanger 4 is small, realize constant temperature air supply, improve the comfort of the cabinet air conditioner, and solve the problem of uneven air supply temperature of the existing cabinet air conditioner; when the air is inletted from the top and discharged from the bottom or inletted from the bottom and discharged from the top, the two upper air blades 153 and the two lower air blades 163 are rotated to realize air supply, which can reduce the size of the large air blades, thereby reducing the size of the inner shell 1 and the outer shell 2, and realizing the coordination of the appearance of the air duct assembly;

[0097] When the indoor unit of the cabinet air conditioner is in cooling mode, the air duct assembly can be in a lower air inlet and upper air outlet mode; the lower air shielding structure 142 closes the two lower air blade cavity outlets 162 and opens the lower return air outlet 141, and the upper air shielding structure 132 opens the two upper air blade cavity outlets 152 and closes the upper return air outlet 131; the two upper air blades 153 rotate, and the first part of the indoor air enters the lower air duct 14 through the lower air outlet 231 of the outer shell and the lower air outlet 12 of the inner shell, and then enters the outer shell cavity 28 through the lower return air outlet 141, and the second part of the indoor air enters the outer shell cavity through the lower air inlet 221 of the outer shell 28, the third part of the indoor air enters the shell cavity 28 through the upper air inlet 212 of the shell; the air in the shell cavity 28 exchanges heat with the indoor heat exchanger 4 when passing through the indoor heat exchanger 4, and then enters the two upper air blade cavities 15 through the two upper air blade cavity inlets 151, and then passes through the upper air duct 13, the upper air outlet 11 of the inner shell and the upper air outlet 211 of the shell and is discharged to the room; the air supply volume of the upper air outlet 211 of the shell is increased, and the air supply pressure of the upper air outlet 211 of the shell is increased simultaneously, so as to realize large air supply and long-distance blowing, thereby realizing rapid cooling of the room and meeting user needs;

[0098] When the indoor unit of the cabinet air conditioner is in heating mode, the air duct assembly can be in an upper air inlet and lower air outlet mode; the upper air shielding structure 132 closes the two upper air blade cavity outlets 152 and opens the upper return air outlet 131, and the lower air shielding structure 142 opens the two lower air blade cavity outlets 162 and closes the lower return air outlet 141; the two lower air blades 163 rotate, and the first part of the indoor air enters the upper air duct 13 through the upper air outlet 211 of the outer shell and the upper air outlet 11 of the inner shell, and then enters the outer shell cavity 28 through the upper return air outlet 131, and the second part of the indoor air enters the outer shell cavity through the lower air inlet 221 of the outer shell 28, the third part of the indoor air enters the shell cavity 28 through the upper air inlet 212 of the shell; the air in the shell cavity 28 exchanges heat with the indoor heat exchanger 4 when flowing through the indoor heat exchanger 4, and then enters the two downwind blade cavities 16 through the two downwind blade cavity inlets 161 respectively, and then passes through the downwind duct 14, the inner shell downwind port 12 and the shell downwind port 231 and is discharged to the room; the air supply volume of the shell downwind port 231 is increased, and the air supply pressure of the shell downwind port 231 is increased simultaneously, so as to realize large air supply and long-distance blowing, thereby realizing rapid heating of the room and meeting user needs.

[0099] The exemplary embodiments of the present disclosure are specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, configurations or implementations described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent configurations included in the spirit and scope of the appended claims.

Claims

1. An air duct assembly, characterized in that: The invention comprises an inner shell (1), wherein the upper end of the shell wall of the inner shell (1) is formed with an inner shell upper air port (11), and the lower end is formed with an inner shell lower air port (12); the inner shell (1) is provided with an upper air duct (13), an upper cavity, a lower cavity and a lower air duct (14) arranged in sequence from top to bottom; The upper cavity is divided into at least two upper wind blade cavities (15); the shell wall of the inner shell (1) is formed with an upper wind blade cavity inlet (151) at a position corresponding to each of the upper wind blade cavities (15); each of the upper wind blade cavities (15) is formed with an upper wind blade cavity outlet (152) at one end close to the upper wind duct (13); one end of the upper wind duct (13) is connected to the upper air port (11) of the inner shell, and the other end of the upper wind duct (13) is connected to all of the upper wind blade cavities (15). The inner shell (1) has an upper return air port (131) formed on the shell wall at a position corresponding to the upper air duct (13); an upper wind shielding structure (132) is movably provided at the upper return air port (131), and the upper wind shielding structure (132) opens the upper return air port (131) and simultaneously closes all the upper air blade cavity outlets (152), or closes the upper return air port (131) and simultaneously opens all the upper air blade cavity outlets (152); The lower cavity is divided into at least two lower blade cavities (16); a lower blade cavity inlet (161) is formed on the shell wall of the inner shell (1) at a position corresponding to each of the lower blade cavities (16); each of the lower blade cavities (16) is formed with a lower blade cavity outlet (162) at one end close to the lower air duct (14); one end of the lower air duct (14) is connected to the lower air outlet (12) of the inner shell, and the other end of the lower air duct (14) is connected to all of the lower blade cavities (16). The lower air return port (141) is formed on the shell wall of the inner shell (1) at a position corresponding to the lower air duct (14); a lower wind shielding structure (142) is movably provided at the lower air return port (141), and the lower wind shielding structure (142) opens the lower air return port (141) and simultaneously closes all the lower air blade cavity outlets (162), or closes the lower air return port (141) and simultaneously opens all the lower air blade cavity outlets (162); At least two of all the upper wind blade cavities (15) are rotatably provided with upper wind blades (153), and at least two of all the lower wind blade cavities (16) are rotatably provided with lower wind blades (163).

2. The air duct assembly according to claim 1, characterized in that: It also comprises an outer shell (2); an upper shell air port (211) is formed at the upper end of the shell wall of the outer shell (2), and a lower shell air port (231) is formed at the lower end; an outer shell cavity (28) is formed inside the outer shell (2); the inner shell (1) is arranged in the outer shell cavity (28), and the upper shell air port (11) is connected to the upper shell air port (211), and the lower shell air port (12) is connected to the lower shell air port (231); the upper blade cavity inlet (151) and the lower blade cavity inlet (161) are both connected to the outer shell cavity (28); When the upper wind shielding structure (132) opens the upper return air port (131) and simultaneously closes all the upper wind blade cavity outlets (152), the upper air duct (13) and the shell cavity (28) are connected through the upper return air port (131), and the upper air duct (13) and all the upper wind blade cavities (15) are not connected; when the upper wind shielding structure (132) closes the upper return air port (131) and simultaneously opens all the upper wind blade cavity outlets (152), the upper air duct (13) and the shell cavity (28) are not connected, and the upper air duct (13) and each of the upper wind blade cavities (15) are connected through the corresponding upper wind blade cavity outlet (152); When the lower wind shielding structure (142) opens the lower return air port (141) and simultaneously closes all the lower wind blade cavity outlets (162), the lower wind duct (14) and the outer shell cavity (28) are connected via the lower return air port (141), and the lower wind duct (14) and all the lower wind blade cavities (16) are not connected; when the lower wind shielding structure (142) closes the lower return air port (141) and simultaneously opens all the lower wind blade cavity outlets (162), the lower wind duct (14) and the outer shell cavity (28) are not connected, and the lower wind duct (14) and each lower wind blade cavity (16) are connected via the corresponding lower wind blade cavity outlet (162).

3. The air duct assembly according to claim 2, characterized in that: The air duct assembly is provided with an upper air inlet and a lower air outlet mode and a lower air inlet and an upper air outlet mode; When the upper wind shielding structure (132) opens the upper return air port (131) and simultaneously closes all the upper wind blade cavity outlets (152), and the lower wind shielding structure (142) closes the lower return air port (141) and simultaneously opens all the lower wind blade cavity outlets (162), at least two of all the lower wind blades (163) rotate, and the air duct assembly is in the upper air inlet and lower air outlet mode; When the upper wind shielding structure (132) closes the upper return air outlet (131) and opens all the upper wind blade cavity outlets (152), and the lower wind shielding structure (142) opens the lower return air outlet (141) and closes all the lower wind blade cavity outlets (162), at least two of all the upper wind blades (153) rotate, and the air duct assembly is in the lower air inlet and upper air outlet mode.

4. The air duct assembly according to claim 3, characterized in that: The upper end of the shell wall of the shell (2) is also formed with an upper shell air inlet (212), and the lower end is also formed with a lower shell air inlet (221); the upper shell air inlet (212) is located at the rear side of the upper shell air inlet (211), and the lower shell air inlet (221) is located at the rear side of the lower shell air inlet (231); the upper shell air inlet (212) and the lower shell air inlet (221) are both connected to the environment of the shell (2) and the shell cavity (28); When the air duct assembly is in the upper air inlet and lower air outlet mode and the lower air inlet and upper air outlet mode, air in the environment where the housing (2) is located enters the housing cavity (28) through the upper housing air inlet (212) and the lower housing air inlet (221).

5. The air duct assembly according to claim 4, characterized in that: The air duct assembly is also provided with a mode of simultaneously discharging air from top to bottom; When the upper wind shielding structure (132) closes the upper return air outlet (131) and simultaneously opens all the upper wind blade cavity outlets (152), and the lower wind shielding structure (142) closes the lower return air outlet (141) and simultaneously opens all the lower wind blade cavity outlets (162), at least two of all the lower wind blades (163) are rotated, and at least two of all the upper wind blades (153) are rotated, and the air duct assembly is in the upper and lower simultaneous air outlet mode.

6. The air duct assembly according to claim 4, characterized in that: The shell wall of the shell (2) comprises a shell top wall (21), a shell bottom wall (22), a shell front wall (23) and a shell rear wall (24); the shell top wall (21) and the shell bottom wall (22) are arranged opposite to each other in the upper and lower directions; the shell top wall (21) is formed with the shell upper air outlet (211) and the shell upper air inlet (212); the shell bottom wall (22) is formed with the shell lower air inlet (221); the shell front wall (23) and the shell rear wall (24) are arranged opposite to each other in the front and rear directions; the shell front wall (23) and the shell rear wall (24) are both connected between the shell top wall (21) and the shell bottom wall (22); the shell front wall (23) is formed with the shell lower air outlet (231); The shell wall of the inner shell (1) comprises an inner shell rear wall (171) corresponding to the outer shell rear wall (24), the inner shell rear wall (171) being provided with the upper return air outlet (131) at a position corresponding to the upper air duct (13), and the inner shell rear wall (171) being provided with the lower return air outlet (141) at a position corresponding to the lower air duct (14).

7. The air duct assembly according to claim 6, characterized in that: The housing (2) further comprises a chassis (29) and a left housing wall (25) and a right housing wall (26) which are arranged opposite to each other on the left and right sides. The left housing wall (25), the front housing wall (23), the right housing wall (26) and the rear housing wall (24) are sequentially connected and are arranged with the housing top wall (21), the housing bottom wall (22) and the chassis (29) to form the housing cavity (28). The shell wall of the inner shell (1) further comprises an inner shell left wall (172) corresponding to the outer shell left wall (25) and an inner shell right wall (173) corresponding to the outer shell right wall (26); the inner shell left wall (172) and the inner shell right wall (173) are both provided with an upper wind blade cavity inlet (151) at a position corresponding to each of the upper wind blade cavities (15); and the inner shell left wall (172) and the inner shell right wall (173) are both provided with a lower wind blade cavity inlet (161) at a position corresponding to each of the lower wind blade cavities (16).

8. The air duct assembly according to claim 2, characterized in that: It also comprises an upper ventilation frame (31) and a lower ventilation frame (32), wherein the upper ventilation frame (31) is arranged above the inner shell (1) and located in the outer shell cavity (28), and the upper ventilation frame (31) is formed with an upper ventilation duct (311), wherein the upper ventilation duct (311) is connected with the upper air outlet (211) of the outer shell and the upper air outlet (11) of the inner shell; The lower ventilation frame (32) is arranged below the inner shell (1) and is located in the outer shell cavity (28); the lower ventilation frame (32) is formed with a lower ventilation duct (321); the lower ventilation duct (321) is connected to the lower air outlet (231) of the outer shell and the lower air outlet (12) of the inner shell.

9. The air duct assembly according to claim 1, characterized in that: An upper volute tongue (154) is arranged in the upper cavity, and the upper volute tongue (154) divides the upper cavity into two upper wind blade cavities (15); the volume of one of the upper wind blade cavities (15) is larger than the volume of the other upper wind blade cavity (15), and the upper wind blade cavity (15) with a larger volume is located above and in front of the upper wind blade cavity (15) with a smaller volume; A lower volute tongue (164) is arranged in the lower cavity, and the lower volute tongue (164) divides the lower cavity into two lower blade cavities (16); the volume of one lower blade cavity (16) is larger than the volume of the other lower blade cavity (16), and the lower blade cavity (16) with a larger volume is located in front and below the lower blade cavity (16) with a smaller volume.

10. A cabinet-type air conditioner indoor unit, characterized in that: It comprises an indoor heat exchanger (4) and the air duct assembly according to any one of claims 1 to 9, wherein the indoor heat exchanger (4) is arranged on the air inlet side of the upper wind blade cavity inlet (151) and the lower wind blade cavity inlet (161).

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