Cabinet type air conditioner indoor unit

Abstract

The cabinet type air conditioner indoor unit comprises a shell and an air duct assembly, an upper air opening and an upper air inlet are formed in the upper portion of the shell, and a lower air opening and a lower air inlet are formed in the lower portion of the shell; the air duct assembly is arranged in the shell and forms an upper fan blade cavity and a lower fan blade cavity; an upper main air duct is communicated between the upper air port and the outlet of the upper fan blade cavity A, and an upper auxiliary air duct is communicated between the upper air port and the outlet of the lower fan blade cavity C; a lower main air duct is communicated between the lower air port and the outlet of the lower fan blade cavity D; a lower auxiliary air duct is communicated between the lower air port and the outlet of the upper fan blade cavity B; the upper air inlet and the communicating cavity form an upper auxiliary flow path, and the lower air inlet and the communicating cavity form a lower auxiliary flow path; the indoor unit can form a first main flow path where air enters from the lower main air duct and air exits from the upper main air duct and the upper auxiliary air duct at the same time, or a second main flow path where air enters from the upper main air duct and air exits from the lower main air duct and the lower auxiliary air duct at the same time, or a third main flow path where air exits from the upper main air duct and the lower main air duct at the same time. And the air inlet amount and the air supply amount are increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and particularly relates to a floor-standing air conditioner indoor unit. Background Art

[0002] In existing floor-standing air conditioner indoor units, upper and lower air outlets which are arranged opposite to each other up and down and an air inlet formed between the upper and lower air outlets are formed on the side wall of the housing; by blowing air through the upper air outlet, shower cooling can be realized, and by blowing air through the lower air outlet, carpet heating can be realized; however, the positions of the air outlet and the air inlet of the indoor unit are relatively unchanged, the temperature of the indoor air is stratified in the height direction, the air with a high temperature accumulates on the upper side of the room due to its small density, and the air with a low temperature accumulates on the lower side of the room due to its large density, resulting in these indoor units being unable to balance the cooling and heating requirements, the temperature distribution of the indoor air being uneven, and the energy-saving and comfort effects being poor. Summary of the Invention

[0003] In view of this, the present invention provides a floor-standing air conditioner indoor unit to solve the problems that in existing floor-standing air conditioners, the relative positions of the air inlet and the air outlet remain unchanged, resulting in the inability to balance the cooling and heating requirements, the uneven temperature distribution of the indoor air, and poor energy-saving and comfort effects.

[0004] The present invention provides a floor-standing air conditioner indoor unit, including a housing and an air duct assembly. An upper air outlet and an upper air inlet are formed in the upper part of the housing, and a lower air outlet and a lower air inlet are formed in the lower part of the housing; the upper air outlet, the upper air inlet, the lower air outlet and the lower air inlet are all communicated with the room;

[0005] The air duct assembly is arranged inside the housing, and the air duct assembly forms an upper air blade cavity and a lower air blade cavity which are arranged opposite to each other up and down; an upper air blade cavity inlet, an upper air blade cavity A outlet and an upper air blade cavity B outlet are formed in the upper air blade cavity; a lower air blade cavity inlet, a lower air blade cavity C outlet and a lower air blade cavity D outlet are formed in the lower air blade cavity; an upper main air duct is communicated between the upper air outlet and the upper air blade cavity A outlet, and an upper auxiliary air duct is communicated between the upper air outlet and the lower air blade cavity C outlet; a lower main air duct is communicated between the lower air outlet and the lower air blade cavity D outlet, and a lower auxiliary air duct is communicated between the lower air outlet and the upper air blade cavity B outlet; an upper air return opening is formed on the side wall of the upper main air duct, and the vertical distance between the upper air return opening and the upper air outlet is greater than the vertical distance between the upper air return opening and the upper air blade cavity; a lower air return opening is formed on the side wall of the lower main air duct, and the vertical distance between the lower air return opening and the lower air outlet is greater than the vertical distance between the lower air return opening and the lower air blade cavity;

[0006] A communication cavity is formed inside the housing between the upper air return opening and the lower air return opening; the upper air return opening communicates with the upper main air duct and the communication cavity, and the lower air return opening communicates with the lower main air duct and the communication cavity; the upper air inlet communicates with the communication cavity to form an upper auxiliary flow path, and the lower air inlet communicates with the communication cavity to form a lower auxiliary flow path;

[0007] The outlets of the upper air blade cavity A, the upper air blade cavity B, the lower air blade cavity C, the lower air blade cavity D, the upper air return opening, and the lower air return opening can all be controlled to be opened or closed, so that the cabinet-type air conditioner indoor unit can form a first main flow path with air entering from the lower main air duct and exiting simultaneously from the upper main air duct and the upper auxiliary air duct, or a second main flow path with air entering from the upper main air duct and exiting simultaneously from the lower main air duct and the lower auxiliary air duct, or a third main flow path with air exiting simultaneously from the upper main air duct and the lower main air duct.

[0008] Further optionally, when the lower air return opening is in the open state, the upper air return opening is in the closed state, the outlet of the upper air blade cavity B is in the closed state, and the outlet of the lower air blade cavity C is in the open state, the lower air outlet, the lower main air duct, the lower air return opening, and the communication cavity are connected in sequence, the communication cavity, the upper air blade cavity inlet, the upper air blade cavity, the upper main air duct, and the upper air outlet are connected in sequence, and the communication cavity, the lower air blade cavity inlet, the lower air blade cavity, the upper auxiliary air duct, and the upper air outlet are connected in sequence, and the first main flow path can be formed between the upper air outlet and the lower air outlet;

[0009] When the lower air return opening is in the closed state, the upper air return opening is in the open state, and the outlet of the lower air blade cavity C is in the closed state, the upper air outlet, the upper main air duct, the upper air return opening, and the communication cavity are connected in sequence, the communication cavity, the lower air blade cavity inlet, the lower air blade cavity, the lower main air duct, and the lower air outlet are connected in sequence, and the communication cavity, the upper air blade cavity inlet, the upper air blade cavity, the lower auxiliary air duct, and the lower air outlet are connected in sequence, and the second main flow path can be formed between the upper air outlet and the lower air outlet;

[0010] When the upper air return opening, the lower air return opening, the outlet of the upper air blade cavity B, and the outlet of the lower air blade cavity C are all in the closed state, the communication cavity, the upper air blade cavity inlet, the upper air blade cavity, the upper main air duct, and the upper air outlet are connected in sequence, and the communication cavity, the lower air blade cavity inlet, the lower air blade cavity, the lower main air duct, and the lower air outlet are connected in sequence, and the third main flow path can be formed between the upper air outlet and the lower air outlet.

[0011] Further optionally, an upper wind blocking structure is movably arranged at the upper air return opening, and the upper wind blocking structure has a first working position for opening the upper air return opening while closing the outlet of the upper air blade cavity A and a second working position for closing the upper air return opening while opening the outlet of the upper air blade cavity A;

[0012] The lower air return opening is movably provided with a lower wind blocking structure, and the lower wind blocking structure has a third working position for opening the lower air return opening and closing the outlet of the lower airfoil cavity D, and a fourth working position for closing the lower air return opening and opening the outlet of the lower airfoil cavity D;

[0013] When the upper wind blocking structure is in the second working position and the lower wind blocking structure is in the third working position, the first main flow path can be formed between the upper air opening and the lower air opening; when the upper wind blocking structure is in the first working position and the lower wind blocking structure is in the fourth working position, the second main flow path can be formed between the upper air opening and the lower air opening; when the upper wind blocking structure is in the second working position and the lower wind blocking structure is in the fourth working position, the third main flow path can be formed between the upper air opening and the lower air opening.

[0014] Further optionally, an upper scroll tongue is movably arranged in the upper airfoil cavity, and the structure of the upper scroll tongue is adapted to the profile structure of the upper airfoil cavity; the upper scroll tongue has a fifth working position for guiding the air in the upper airfoil cavity to the outlet of the upper airfoil cavity A and a sixth working position for guiding the air in the upper airfoil cavity to the outlet of the upper airfoil cavity B;

[0015] A lower scroll tongue is movably arranged in the lower airfoil cavity, and the structure of the lower scroll tongue is adapted to the profile structure of the lower airfoil cavity; the lower scroll tongue has a seventh working position for guiding the air in the lower airfoil cavity to the outlet of the lower airfoil cavity C and an eighth working position for guiding the air in the lower airfoil cavity to the outlet of the lower airfoil cavity D;

[0016] When the upper scroll tongue is in the fifth working position and the lower scroll tongue is in the seventh working position, the first main flow path can be formed between the upper air opening and the lower air opening; when the upper scroll tongue is in the sixth working position and the lower scroll tongue is in the eighth working position, the second main flow path can be formed between the upper air opening and the lower air opening; when the upper scroll tongue is in the fifth working position and the lower scroll tongue is in the eighth working position, the third main flow path can be formed between the upper air opening and the lower air opening.

[0017] Further optionally, the axis of the upper airfoil cavity is along the horizontal direction; the inlet of the upper airfoil cavity is formed at one axial end of the upper airfoil cavity, the outlet of the upper airfoil cavity A is formed on the upper side of the upper airfoil cavity, and the outlet of the upper airfoil cavity B is formed on the lower side of the lower airfoil cavity;

[0018] The axis of the lower airfoil cavity is along the horizontal direction; the inlet of the lower airfoil cavity is formed at one axial end of the lower airfoil cavity, the outlet of the lower airfoil cavity C is formed on the upper side of the lower airfoil cavity, and the outlet of the lower airfoil cavity D is formed on the lower side of the lower airfoil cavity.

[0019] Further optionally, the housing includes a rear side wall of the housing; the inlets of the upper air blade cavity and the lower air blade cavity both face the rear side wall of the housing;

[0020] The indoor unit further includes an indoor heat exchanger, which includes an upper heat exchange section and a lower heat exchange section. The upper heat exchange section is arranged between the rear side wall of the housing and the inlet of the upper air blade cavity, and the lower heat exchange section is arranged between the rear side wall of the housing and the inlet of the lower air blade cavity.

[0021] Further optionally, the housing further includes a top wall of the housing and a front side wall of the housing. The top wall of the housing forms the upper air outlet; the upper auxiliary air duct is arranged close to the front side wall of the housing, the upper main air duct is arranged at the rear side of the upper auxiliary air duct, and one end of the upper auxiliary air duct close to the upper air outlet and one end of the upper main air duct close to the upper air outlet communicate at the upper air outlet;

[0022] The front side wall of the housing is arranged at the front side of the bottom of the top wall of the housing. The front side wall of the housing forms the lower air outlet; the lower auxiliary air duct is arranged close to the front side wall of the housing, the lower main air duct is arranged at the rear side of the lower auxiliary air duct, and one end of the lower auxiliary air duct close to the lower air outlet and one end of the lower main air duct close to the lower air outlet communicate at the lower air outlet.

[0023] Further optionally, the upper air outlet includes an upper auxiliary air outlet and an upper main air outlet arranged front and back. The upper auxiliary air outlet communicates with the upper auxiliary air duct, and the upper main air outlet communicates with the upper main air duct; the lower air outlet includes a lower auxiliary air outlet and a lower main air outlet arranged up and down relatively. The lower auxiliary air outlet communicates with the lower auxiliary air duct, and the lower main air outlet communicates with the lower main air duct.

[0024] Further optionally, in the direction from the outlet of the upper air blade cavity A to the upper main air outlet, the flow area of the upper main air duct gradually increases; in the direction from the outlet of the lower air blade cavity C to the upper auxiliary air outlet, the flow area of the upper auxiliary air duct gradually increases;

[0025] In the direction from the outlet of the lower air blade cavity D to the lower main air outlet, the flow area of the lower main air duct gradually increases; in the direction from the outlet of the upper air blade cavity B to the lower auxiliary air outlet, the flow area of the lower auxiliary air duct gradually increases.

[0026] Compared with the prior art, the beneficial effects of the present invention mainly lie in:

[0027] The positions of the upper air inlet and the lower air inlet are optimized, enabling reversible air supply up and down and simultaneous air supply up and down. Considering the cooling and heating requirements, it makes full use of the principles that cold air sinks during cooling and hot air rises during heating, expanding the air flow range and forming large swirling eddies of air in the room where the indoor unit is located. The upper air inlets and the lower air inlets are added, increasing the air intake volume. Air can be supplied through both the main air duct and the auxiliary air duct, improving the air supply volume, increasing the speed of temperature change of the indoor air, reducing the vertical temperature difference in the room, making the temperature distribution of the indoor air uniform, avoiding air flow short - circuit, and improving the comfort of the air. Description of the Drawings

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings described below are only exemplary. For those of ordinary skill in the art, without creative efforts, other implementation drawings can also be obtained based on the provided drawings.

[0029] The structures, proportions, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions for the implementation of the present invention. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention.

[0030] Figure 1 It is a schematic assembly structure diagram of an embodiment of a cabinet - type air conditioner indoor unit provided by the present invention;

[0031] Figure 2 It is a schematic exploded structure diagram of an embodiment of a cabinet - type air conditioner indoor unit provided by the present invention;

[0032] Figure 3 It is a schematic axonometric structure diagram of an embodiment of an air duct assembly (without upper and lower air ducts) provided by the present invention;

[0033] Figure 4a 、 Figure 4b 、 Figure 4c and Figure 4d It is a schematic assembly structure diagram of an embodiment of an air duct assembly (without upper and lower air ducts) provided by the present invention;

[0034] Figure 5 It is a schematic assembly structure diagram of an embodiment of an air duct assembly (without upper and lower air ducts) and an indoor heat exchanger provided by the present invention;

[0035] Figure 6a and Figure 6bSchematic structural diagram of an embodiment when the cabinet air conditioner indoor unit provided by the present invention is in the upper air outlet mode;

[0036] Figure 7a and Figure 7b Schematic structural diagram of an embodiment when the cabinet air conditioner indoor unit provided by the present invention is in the lower air outlet mode;

[0037] Figure 8a and Figure 8b Schematic structural diagram of an embodiment when the cabinet air conditioner indoor unit provided by the present invention is in the upper and lower simultaneous air outlet mode;

[0038] In the figure:

[0039] 1 - Housing; 11 - Front side wall of the housing; 111 - Lower auxiliary air outlet; 112 - Lower main air outlet; 12 - Rear side wall of the housing; 121 - Lower air inlet; 13 - Top wall of the housing; 131 - Upper air outlet; 132 - Upper air inlet; 14 - Communication cavity; 15 - Base;

[0040] 2 - Air duct assembly; 21 - Volute; 22 - Volute cover; 23 - Upper air blade cavity; 231 - Upper air blade cavity inlet; 232 - Upper air blade cavity A outlet; 233 - Upper air blade cavity B outlet; 234 - Upper air blade; 24 - Lower air blade cavity; 241 - Lower air blade cavity inlet; 242 - Lower air blade cavity C outlet; 243 - Lower air blade cavity D outlet; 244 - Lower air blade; 251 - Upper main air duct; 252 - Upper return air opening; 253 - Upper auxiliary air duct; 261 - Lower main air duct; 262 - Lower return air opening; 263 - Lower auxiliary air duct; 27 - Upper ventilation shell; 271 - Upper ventilation duct; 28 - Lower ventilation shell; 281 - Lower ventilation duct;

[0041] 31 - Upper wind blocking structure; 32 - Lower wind blocking structure; 33 - Upper volute tongue; 34 - Lower volute tongue; 41 - Upper heat exchange section; 42 - Lower heat exchange section. Specific embodiments

[0042] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0043] The terms used in the embodiments of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The singular forms "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. "Plural" generally includes at least two, but does not exclude the case of including at least one.

[0044] It should be understood that the term "and / or" used herein is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0045] It should also be noted that the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a commodity or system including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such commodity or system. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of additional identical elements in the commodity or system including the said element.

[0046] In the existing cabinet air conditioner indoor unit, upper and lower air outlets arranged oppositely up and down and an air inlet formed between the upper and lower air outlets are formed on the side wall of the housing; by blowing air through the upper air outlet, shower cooling can be achieved, and by blowing air through the lower air outlet, carpet heating can be achieved; however, the air inlet is located at the back of the indoor unit, and a certain safety distance needs to be reserved between the indoor unit and the wall during installation, resulting in a large installation space for the indoor unit; the positions of the air inlet, the upper air outlet and the lower air outlet are fixed, and the distances between the air inlet and the upper air outlet and the lower air outlet are both close, which easily causes air flow short circuit, narrow air flow range, small air supply volume, slow temperature change of indoor air, and long time required for the room where the indoor unit is located to reach the set temperature.

[0047] The present invention creatively provides a cabinet air conditioner indoor unit, including a housing and an air duct assembly. An upper air outlet and an upper air inlet are formed in the upper part of the housing, and a lower air outlet and a lower air inlet are formed in the lower part of the housing.

[0048] The air duct assembly is disposed inside the housing, and the air duct assembly is formed with an upper air blade cavity and a lower air blade cavity which are arranged opposite to each other up and down; the upper air blade cavity is formed with an upper air blade cavity inlet, an upper air blade cavity A outlet and an upper air blade cavity B outlet; the lower air blade cavity is formed with a lower air blade cavity inlet, a lower air blade cavity C outlet and a lower air blade cavity D outlet; there is an upper main air duct communicating between the upper air inlet and the upper air blade cavity A outlet, and an upper auxiliary air duct communicating between the upper air inlet and the lower air blade cavity C outlet; there is a lower main air duct communicating between the lower air outlet and the lower air blade cavity D outlet, and a lower auxiliary air duct communicating between the lower air outlet and the upper air blade cavity B outlet; the side wall of the upper main air duct is formed with an upper air return opening; the side wall of the lower main air duct is formed with a lower air return opening;

[0049] A communication cavity is formed inside the housing between the upper air return opening and the lower air return opening; the upper air return opening communicates the upper main air duct and the communication cavity, and the lower air return opening communicates the lower main air duct and the communication cavity; the upper air inlet communicates with the communication cavity and forms an upper auxiliary flow path, and indoor air can enter the upper auxiliary flow path through the upper air inlet; the lower air inlet communicates with the communication cavity and forms a lower auxiliary flow path, and indoor air can enter the lower auxiliary flow path through the lower air inlet;

[0050] The upper air blade cavity A outlet, the upper air blade cavity B outlet, the lower air blade cavity C outlet, the lower air blade cavity D outlet, the upper air return opening and the lower air return opening can all be controlled to be opened or closed, so that the cabinet-type air conditioner indoor unit can form a first main flow path with air entering through the lower main air duct and air exiting simultaneously through the upper main air duct and the upper auxiliary air duct, or a second main flow path with air entering through the upper main air duct and air exiting simultaneously through the lower main air duct and the lower auxiliary air duct, or a third main flow path with air exiting simultaneously through the upper main air duct and the lower main air duct;

[0051] The positions of the upper air inlet and the lower air inlet are optimized, and the up-and-down reversible air outlet and the up-and-down simultaneous air outlet can be realized; taking into account the cooling and heating requirements, making full use of the principle that cold air sinks during cooling and hot air rises during heating, the airflow range is expanded, so that a large swirling eddy current is formed in the room where the indoor unit is located; the upper air inlet and the lower air inlet are added, increasing the air intake; air can be sent through both the main air duct and the auxiliary air duct, improving the air supply volume, increasing the temperature change speed of the indoor air, reducing the vertical temperature difference in the room, making the temperature distribution of the indoor air uniform, avoiding air flow short circuit, and improving the comfort of the air.

[0052] <Cabinet-type air conditioner indoor unit>

[0053] As Figures 1 to 8b shown, this embodiment provides a cabinet-type air conditioner indoor unit, including a housing 1 and an air duct assembly 2. The upper part of the housing 1 is formed with an upper air inlet 131 and an upper air inlet 132, and the lower part of the housing 1 is formed with a lower air outlet and a lower air inlet 121; the upper air inlet 131, the upper air inlet 132, the lower air outlet and the lower air inlet 121 all communicate with the indoor;

[0054] The air duct assembly 2 is arranged inside the housing 1, and the air duct assembly 2 is formed with an upper air blade cavity 23 and a lower air blade cavity 24 which are arranged opposite to each other up and down; the upper air blade cavity 23 is formed with an upper air blade cavity inlet 231, an upper air blade cavity A outlet 232 and an upper air blade cavity B outlet 233; the lower air blade cavity 24 is formed with a lower air blade cavity inlet 241, a lower air blade cavity C outlet 242 and a lower air blade cavity D outlet 243; there is an upper main air duct 251 communicating between the upper air inlet 131 and the upper air blade cavity A outlet 232, and an upper auxiliary air duct 253 communicating between the upper air inlet 131 and the lower air blade cavity C outlet 242; there is a lower main air duct 261 communicating between the lower air outlet and the lower air blade cavity D outlet 243, and a lower auxiliary air duct 263 communicating between the lower air outlet and the upper air blade cavity B outlet 233; the side wall of the upper main air duct 251 is formed with an upper air return opening 252, and the side wall of the lower main air duct 261 is formed with a lower air return opening 262; specifically, the side wall of the upper main air duct 251 is formed with an upper air return opening 252, and the vertical distance between the upper air return opening 252 and the upper air inlet 131 is greater than the vertical distance between the upper air return opening 252 and the upper air blade cavity 23; the side wall of the lower main air duct 261 is formed with a lower air return opening 262, and the vertical distance between the lower air return opening 262 and the lower air outlet is greater than the vertical distance between the lower air return opening 262 and the lower air blade cavity 24;

[0055] A communication cavity 14 is formed inside the housing 1 between the upper air return opening 252 and the lower air return opening 262; the upper air return opening 252 communicates the upper main air duct 251 and the communication cavity 14, and the air in the upper main air duct 251 can enter the communication cavity 14 through the upper air return opening 252; the lower air return opening 262 communicates the lower main air duct 261 and the communication cavity 14, and the air in the lower main air duct 261 can enter the communication cavity 14 through the lower air return opening 262; the upper air inlet 132 communicates with the communication cavity 14 and forms an upper auxiliary flow path, and indoor air can enter the upper auxiliary flow path through the upper air inlet 132; the lower air inlet 121 communicates with the communication cavity 14 and forms a lower auxiliary flow path, and indoor air can enter the lower auxiliary flow path through the lower air inlet 121; specifically, a housing cavity is formed inside the housing 1, and the air duct assembly 2 is arranged in the housing cavity; the communication cavity 14 is a part of the housing cavity; an air treatment module can be arranged in the communication cavity 14 for filtering, humidifying, dehumidifying, flavoring or deodorizing the air;

[0056] The upper air blade cavity A outlet 232, the upper air blade cavity B outlet 233, the lower air blade cavity C outlet 242, the lower air blade cavity D outlet 243, the upper air return opening 252 and the lower air return opening 262 can all be controlled to be opened or closed; so that the cabinet-type air conditioner indoor unit can form a first main flow path with air entering from the lower main air duct 261 and air exiting simultaneously from the upper main air duct 251 and the upper auxiliary air duct 253, or a second main flow path with air entering from the upper main air duct 251 and air exiting simultaneously from the lower main air duct 261 and the lower auxiliary air duct 263, or a third main flow path with air exiting simultaneously from the upper main air duct 251 and the lower main air duct 261;

[0057] Specifically, ① the upper air outlet mode of the cabinet-type air conditioner;

[0058] When the first main flow path is in circulation, the indoor air near the lower air outlet can enter the lower main air duct 261 through the lower air outlet and enter the communication cavity 14 through the lower return air outlet 262; when the upper auxiliary flow path is in communication, the indoor air near the upper air inlet 132 can enter the upper auxiliary flow path through the upper air inlet 132; when the lower auxiliary flow path is in communication, the indoor air near the lower air inlet 121 can enter the lower auxiliary flow path through the lower air inlet 121; a part of the air in the communication cavity 14 enters the upper air blade cavity 23 through the upper air blade cavity inlet 231, and then is discharged through the upper main air duct 251 and the upper air outlet 131; another part of the air in the communication cavity 14 enters the lower air blade cavity 24 through the lower air blade cavity inlet 241, and then is discharged through the upper auxiliary air duct 253 and the upper air outlet 131.

[0059] ② The lower air outlet mode of the floor-standing air conditioner;

[0060] When the second main flow path is in circulation, the indoor air near the upper air outlet 131 can enter the upper main air duct 251 through the upper air outlet 131 and enter the communication cavity 14 through the upper return air outlet 252; when the upper auxiliary flow path is in communication, the indoor air near the upper air inlet 132 can enter the upper auxiliary flow path through the upper air inlet 132; when the lower auxiliary flow path is in communication, the indoor air near the lower air inlet 121 can enter the lower auxiliary flow path through the lower air inlet 121; a part of the air in the communication cavity 14 enters the lower air blade cavity 24 through the lower air blade cavity inlet 241, and then is discharged through the lower main air duct 261 and the lower air outlet; another part of the air in the communication cavity 14 enters the upper air blade cavity 23 through the upper air blade cavity inlet 231, and then is discharged through the lower auxiliary air duct 253 and the lower air outlet.

[0061] ③ The upper and lower simultaneous air outlet mode of the floor-standing air conditioner;

[0062] When the upper auxiliary flow path is in communication, the indoor air near the upper air inlet 132 can enter the upper auxiliary flow path through the upper air inlet 132; when the lower auxiliary flow path is in communication, the indoor air near the lower air inlet 121 can enter the lower auxiliary flow path through the lower air inlet 121; when the third main flow path is in circulation, a part of the air in the communication cavity 14 enters the upper air blade cavity 23 through the upper air blade cavity inlet 231, and then is discharged through the upper main air duct 251 and the upper air outlet 131; another part of the air in the communication cavity 14 enters the lower air blade cavity 24 through the lower air blade cavity inlet 241, and then is discharged through the lower main air duct 261 and the lower air outlet.

[0063] Regarding the problem that the inappropriate opening or closing states of the upper airfoil cavity A outlet 232, upper airfoil cavity B outlet 233, lower airfoil cavity C outlet 242, lower airfoil cavity D outlet 243, upper air return opening 252, and lower air return opening 262 result in the disconnection of the corresponding flow paths, in this embodiment, it is proposed that when the lower air return opening 262 is in the open state and the lower airfoil cavity D outlet 243 is in the closed state, the lower air inlet, lower main air duct 261, lower air return opening 262, and the communication cavity 14 are connected in sequence; when the upper air return opening 252 is in the closed state, the upper airfoil cavity A outlet 232 is in the open state, and the upper airfoil cavity B outlet 233 is in the closed state, the communication cavity 14, upper airfoil cavity inlet 231, upper airfoil cavity 23, upper main air duct 251, and upper air inlet 131 are connected in sequence; when the lower airfoil cavity C outlet 242 is in the open state, the communication cavity 14, lower airfoil cavity inlet 241, lower airfoil cavity 24, upper auxiliary air duct 253, and upper air inlet 131 are connected in sequence. Thus, a first main flow path with air entering from the lower air inlet and exiting from the upper air inlet 131 can be formed between the upper air inlet 131 and the lower air inlet.

[0064] When the upper air return opening 252 is in the open state and the upper airfoil cavity A outlet 232 is in the closed state, the upper air inlet 131, upper main air duct 251, upper air return opening 252, and the communication cavity 14 are connected in sequence; when the lower air return opening 262 is in the closed state and the lower airfoil cavity D outlet 243 is in the open state, the communication cavity 14, lower airfoil cavity inlet 241, lower airfoil cavity 24, lower main air duct 261, and lower air inlet are connected in sequence; when the upper airfoil cavity B outlet 233 is in the open state, and the communication cavity 14, upper airfoil cavity inlet 231, upper airfoil cavity 23, lower auxiliary air duct 263, and lower air inlet are connected in sequence, a second main flow path with air entering from the upper air inlet 131 and exiting from the lower air inlet can be formed between the upper air inlet 131 and the lower air inlet.

[0065] When the upper air return opening 252 is in the closed state, the upper airfoil cavity A outlet 232 is in the open state, and the upper airfoil cavity B outlet 233 is in the closed state, the communication cavity 14, upper airfoil cavity inlet 231, upper airfoil cavity 23, upper main air duct 251, and upper air inlet 131 are connected in sequence; when the lower air return opening 262 is in the closed state, the lower airfoil cavity D outlet 243 is in the open state, and the lower airfoil cavity C outlet 242 is in the closed state, the communication cavity 14, lower airfoil cavity inlet 241, lower airfoil cavity 24, lower main air duct 261, and lower air inlet are connected in sequence. A third main flow path can be formed between the upper air inlet 131 and the lower air inlet.

[0066] Specifically, the air duct assembly 2 includes a main volute 21, a volute cover 22, an upper auxiliary volute and a lower auxiliary volute. The main volute 21 and the volute cover 22 are cooperatively connected to form an upper main air duct 251, an upper air blade cavity 23, a lower air blade cavity 24, and a lower main air duct 261 that are sequentially arranged from top to bottom. The upper auxiliary volute and the volute cover 22 are cooperatively connected to form an upper auxiliary air duct 253, and the upper auxiliary air duct 253 is horizontally arranged side by side with the upper main air duct 251 and the upper air blade cavity 23. The lower auxiliary volute and the volute cover 22 are cooperatively connected to form a lower auxiliary air duct 263, and the lower auxiliary air duct 263 is horizontally arranged side by side with the lower main air duct 261 and the lower air blade cavity 24. An upper air blade 234 is rotatably arranged in the upper air blade cavity 23, and a lower air blade 244 is rotatably arranged in the lower air blade cavity 24.

[0067] Further, an upper wind blocking structure 31 is movably arranged at the upper air return opening 252. The upper wind blocking structure 31 has a first working position for opening the upper air return opening 252 and closing the outlet 232 of the upper air blade cavity A at the same time, and a second working position for closing the upper air return opening 252 and opening the outlet 232 of the upper air blade cavity A at the same time. Preferably, the upper wind blocking structure 31 is an upper baffle, and the upper baffle is rotatably arranged at the upper air return opening 252.

[0068] A lower wind blocking structure 32 is movably arranged at the lower air return opening 262. The lower wind blocking structure 32 has a third working position for opening the lower air return opening 262 and closing the outlet 243 of the lower air blade cavity D at the same time, and a fourth working position for closing the lower air return opening 262 and opening the outlet 243 of the lower air blade cavity D at the same time. Preferably, the lower wind blocking structure 32 is a lower baffle, and the lower baffle is rotatably arranged at the lower air return opening 262.

[0069] When the upper wind blocking structure 31 is in the second working position and the lower wind blocking structure 32 is in the third working position, a first main flow path can be formed between the upper air outlet 131 and the lower air outlet. When the upper wind blocking structure 31 is in the first working position and the lower wind blocking structure 32 is in the fourth working position, a second main flow path can be formed between the upper air outlet 131 and the lower air outlet.

[0070] The cabinet-type air conditioner indoor unit is provided with an upper air outlet mode, a lower air outlet mode, and an upper and lower simultaneous air outlet mode. When the cabinet-type air conditioner indoor unit is in the upper air outlet mode, the upper wind blocking structure 31 is in the second working position, and the lower wind blocking structure 32 is in the third working position. Both the upper air blade 234 and the lower air blade 244 rotate. The indoor air near the lower air outlet can enter the communication cavity 14 through the lower main air duct 261 and the lower air return opening 262. The indoor air near the upper air inlet 132 can enter the communication cavity 14 through the upper air inlet 132. The indoor air near the lower air inlet 121 can enter the communication cavity 14 through the lower air inlet 121. A part of the air in the communication cavity 14 enters the upper air blade cavity 23 through the upper air blade cavity inlet 231, and then is discharged through the upper main air duct 251 and the upper air outlet 131. Another part of the air in the communication cavity 14 enters the lower air blade cavity 24 through the lower air blade cavity inlet 241, and then is discharged through the upper auxiliary air duct 253 and the upper air outlet 131.

[0071] When the floor-standing air conditioner indoor unit is in the downward air outlet mode, the upper air deflector structure 31 is in the first working position, and the lower air deflector structure 32 is in the fourth working position; the upper air blades 234 and the lower air blades 244 both rotate, and the indoor air near the upper air inlet 131 can enter the communication cavity 14 through the upper main air duct 251 and the upper air return opening 252, the indoor air near the upper air inlet 132 can enter the communication cavity 14 through the upper air inlet 132, and the indoor air near the lower air inlet 121 can enter the communication cavity 14 through the lower air inlet 121; a part of the air in the communication cavity 14 enters the lower air blade cavity 24 through the lower air blade cavity inlet 241, and then is discharged through the lower main air duct 261 and the lower air outlet; another part of the air in the communication cavity 14 enters the upper air blade cavity 23 through the upper air blade cavity inlet 231, and then is discharged through the lower auxiliary air duct 263 and the lower air outlet.

[0072] When the floor-standing air conditioner indoor unit is in the simultaneous upper and lower air outlet mode, the upper air deflector structure 31 is in the second working position and the lower air deflector structure 32 is in the fourth working position; the upper air blades 234 and the lower air blades 244 both rotate, and the indoor air near the upper air inlet 132 can enter the communication cavity 14 through the upper air inlet 132, and the indoor air near the lower air inlet 121 can enter the communication cavity 14 through the lower air inlet 121; a part of the air in the communication cavity 14 enters the upper air blade cavity 23 through the upper air blade cavity inlet 231, and then is discharged through the upper main air duct 251 and the upper air outlet 131; another part of the air in the communication cavity 14 enters the lower air blade cavity 24 through the lower air blade cavity inlet 241, and then is discharged through the lower main air duct 261 and the lower air outlet.

[0073] Aiming at the problem that the air in the upper air blade cavity 23 cannot be smoothly discharged through the upper air blade cavity A outlet 232 or the upper air blade cavity B outlet 233, this embodiment proposes that an upper scroll tongue 33 is movably arranged in the upper air blade cavity 23, and the structure of the upper scroll tongue 33 is adapted to the profile structure of the upper air blade cavity 23; the upper scroll tongue 33 has a fifth working position for guiding the air in the upper air blade cavity 23 to the upper air blade cavity A outlet 232 and a sixth working position for guiding the air in the upper air blade cavity 23 to the upper air blade cavity B outlet 233;

[0074] Aiming at the problem that the air in the lower air blade cavity 24 cannot be smoothly discharged through the lower air blade cavity C outlet 242 or the lower air blade cavity D outlet 243, this embodiment proposes that a lower scroll tongue 34 is movably arranged in the lower air blade cavity 24, and the structure of the lower scroll tongue 34 is adapted to the profile structure of the lower air blade cavity 24; the lower scroll tongue 34 has a seventh working position for guiding the air in the lower air blade cavity 24 to the lower air blade cavity C outlet 242 and an eighth working position for guiding the air in the lower air blade cavity 24 to the lower air blade cavity D outlet 243;

[0075] When the upper volute tongue 33 is in the fifth working position and the lower volute tongue 34 is in the seventh working position, a first main flow path can be formed between the upper air inlet 131 and the lower air inlet. When the upper volute tongue 33 is in the sixth working position and the lower volute tongue 34 is in the eighth working position, a second main flow path can be formed between the upper air inlet 131 and the lower air inlet. When the upper volute tongue 33 is in the fifth working position and the lower volute tongue 34 is in the eighth working position, a third main flow path can be formed between the upper air inlet 131 and the lower air inlet.

[0076] Aiming at the problem that the unreasonable structural design of the upper impeller cavity 23 and the lower impeller cavity 24 leads to large air flow resistance, in this embodiment, it is proposed that the axial direction of the upper impeller cavity 23 is along the horizontal direction; the upper impeller cavity inlet 231 is formed at one axial end of the upper impeller cavity 23, the upper impeller cavity A outlet 232 is formed at the top of the upper impeller cavity 23, and the upper impeller cavity B outlet 233 is formed at the bottom of the lower impeller cavity 24;

[0077] The axial direction of the lower impeller cavity 24 is along the horizontal direction; the lower impeller cavity inlet 241 is formed at one axial end of the lower impeller cavity 24, the lower impeller cavity C outlet 242 is formed at the top of the lower impeller cavity 24, and the lower impeller cavity D outlet 243 is formed at the bottom of the lower impeller cavity 24.

[0078] Aiming at the problem that the unreasonable structural design of the housing 1 leads to insufficient air supply, in this embodiment, it is proposed that the housing 1 includes a housing top wall 13, a housing front side wall 11, a housing rear side wall 12 and a base 15. The housing top wall 13 is formed with an upper air inlet 131 and an upper air intake 132. The upper air inlet 131 is located in front of the upper air intake 132; the upper air inlet 131 includes an upper sub-air inlet and an upper main air inlet arranged front and back. The upper sub-air inlet is communicated with the upper sub-air duct 253, and the upper main air inlet is communicated with the upper main air duct 251; the housing front side wall 11 is arranged on the front side of the bottom of the housing top wall 13. A lower air inlet is formed at the lower part of the housing front side wall 11. The lower air inlet includes a lower sub-air inlet 111 and a lower main air inlet 112 arranged up and down; the lower sub-air inlet 111 is communicated with the lower sub-air duct 263, and the lower main air inlet 112 is communicated with the lower main air duct 261; a lower air intake 121 is formed at the lower part of the housing rear side wall 12; the base 15 is arranged at the bottom of the housing front side wall 11 and the housing rear side wall 12;

[0079] The upper sub-air duct 253 is arranged close to the housing front side wall 11 and communicated with the upper air inlet 131; the upper main air duct 251 is arranged at the rear side of the upper sub-air duct 253 and communicated with the upper air inlet 131; the lower sub-air duct 263 is arranged close to the housing front side wall 11 and communicated with the lower sub-air inlet 111, and the lower main air duct 261 is arranged at the rear side of the lower sub-air duct 263 and communicated with the lower main air inlet 112.

[0080] Further, both the upper impeller cavity inlet 231 and the lower impeller cavity inlet 241 face the housing rear side wall 12;

[0081] The cabinet-type air conditioner indoor unit further includes an indoor heat exchanger, which includes an upper heat exchange section 41 and a lower heat exchange section 42. The upper heat exchange section 41 is arranged between the rear side wall 12 of the housing and the inlet 231 of the upper air blade cavity, and the lower heat exchange section 42 is arranged between the rear side wall 12 of the housing and the inlet 241 of the lower air blade cavity; an upper heat exchange area is formed between the upper heat exchange section 41 and the rear side wall 12 of the housing, and from top to bottom, the flow area of the upper heat exchange area gradually decreases; a lower heat exchange area is formed between the lower heat exchange section 42 and the rear side wall 12 of the housing, and from bottom to top, the flow area of the lower heat exchange area gradually decreases.

[0082] The upper main air duct 251 includes a left side wall of the upper main air duct and a right side wall of the upper main air duct; the left side wall of the upper main air duct corresponds to the left side wall of the housing, and the right side wall of the upper main air duct corresponds to the right side wall of the housing; the left side wall of the upper main air duct or the right side wall of the upper main air duct forms an upper air return opening 252; when the upper air return opening 252 is in an open state and the outlet 232 of the upper air blade cavity A is in a closed state, both the upper air blade 234 and the lower air blade 244 rotate, indoor air enters the upper main air duct 251 through the upper air inlet 131, and then is discharged to the communication cavity 14 through the upper air return opening 252. A part of the air in the communication cavity 14 enters the upper heat exchange area and enters the upper air blade cavity 23 through the upper heat exchange section 41. When the air flows through the upper heat exchange section 41, it exchanges heat with the upper heat exchange section 41; another part of the air in the communication cavity 14 enters the lower heat exchange area and enters the lower air blade cavity 24 through the lower heat exchange section 42. When the air flows through the lower heat exchange section 42, it exchanges heat with the lower heat exchange section 42;

[0083] The lower main air duct 261 includes a left side wall of the lower main air duct and a right side wall of the lower main air duct; the left side wall of the lower main air duct corresponds to the left side wall of the housing, and the right side wall of the lower main air duct corresponds to the right side wall of the housing; the left side wall of the lower main air duct or the right side wall of the lower main air duct forms a lower air return opening 262; when the lower air return opening 262 is in an open state and the outlet 243 of the lower air blade cavity D is in a closed state, both the upper air blade 234 and the lower air blade 244 rotate, indoor air enters the lower main air duct 261 through the lower air inlet, and then is discharged to the communication cavity 14 through the lower air return opening 262. A part of the air in the communication cavity 14 enters the lower heat exchange area and enters the lower air blade cavity 24 through the lower heat exchange section 42. When the air flows through the lower heat exchange section 42, it exchanges heat with the lower heat exchange section 42; another part of the air in the communication cavity 14 enters the upper heat exchange area and enters the upper air blade cavity 23 through the upper heat exchange section 41. When the air flows through the upper heat exchange section 41, it exchanges heat with the upper heat exchange section 41.

[0084] The air duct assembly 2 further includes an upper ventilation housing 27 and a lower ventilation housing 28, and both the upper ventilation housing 27 and the lower ventilation housing 28 are arranged in the communication cavity 14; the upper ventilation housing 27 is arranged at the top of the upper main air duct 251 and the upper auxiliary air duct 253 and forms an upper ventilation duct 271, and the upper ventilation duct 271 communicates the upper air inlet 131 with the upper main air duct 251 and the upper air inlet 131 with the upper auxiliary air duct 253;

[0085] The lower ventilation housing 28 is disposed at the bottom of the lower main air duct 261 and the lower auxiliary air duct 263 and is formed with a lower ventilation duct 281. The lower ventilation duct 281 communicates the lower air outlet with the lower main air duct 261 and the lower air outlet with the lower auxiliary air duct 263.

[0086] <Control method>

[0087] This embodiment also provides a control method for an indoor unit of a cabinet air conditioner. The indoor unit of the cabinet air conditioner is the indoor unit of the cabinet air conditioner described in any one of the above; the control method includes:

[0088] S1. Determine the target operation mode of the indoor unit of the cabinet air conditioner;

[0089] S2. Control the upper wind blocking structure 31, the lower wind blocking structure 32, the upper volute tongue 33 and the lower volute tongue 34 according to the target operation mode to form a target flow path in the air duct assembly 2;

[0090] Wherein, the target operation mode is a heating mode or a cooling mode, and the target flow path is a first main flow path, a second main flow path or a third main flow path.

[0091] Further, S2 includes:

[0092] When the target operation mode is the cooling mode, control the upper wind blocking structure 31 to move so that the upper wind blocking structure 31 is in the second working position; control the lower wind blocking structure 32 to move so that the lower wind blocking structure 32 is in the third working position; control the upper volute tongue 33 to move so that the upper volute tongue 33 is in the fifth working position; control the lower volute tongue 34 to move so that the lower volute tongue 34 is in the seventh working position; and then the air duct assembly 2 can form a first main flow path;

[0093] When the target operation mode is the heating mode, control the upper wind blocking structure 31 to move so that the upper wind blocking structure 31 is in the first working position; control the lower wind blocking structure 32 to move so that the lower wind blocking structure 32 is in the fourth working position; control the upper volute tongue 33 to move so that the upper volute tongue 33 is in the sixth working position; control the lower volute tongue 34 to move so that the lower volute tongue 34 is in the eighth working position; and then the air duct assembly 2 can form a second main flow path;

[0094] When the target operation mode is the cooling mode or the heating mode, control the upper wind blocking structure 31 to move so that the upper wind blocking structure 31 is in the second working position; control the lower wind blocking structure 32 to move so that the lower wind blocking structure 32 is in the fourth working position; control the upper volute tongue 33 to move so that the upper volute tongue 33 is in the fifth working position; control the lower volute tongue 34 to move so that the lower volute tongue 34 is in the eighth working position; and then the air duct assembly 2 can form a third main flow path.

[0095] By optimizing the structure of the air duct assembly 2, the cabinet-type air conditioner indoor unit operates in different air inlet and outlet modes under different working conditions and temperatures. In the cooling mode, the upper air deflector structure 31, the lower air deflector structure 32, the upper volute tongue and the lower volute tongue move to the corresponding positions, and the cabinet-type air conditioner indoor unit operates in an upper air outlet mode. Using the principle of cold air sinking, the return air temperature at the lower air outlet is lower than that of the middle return air mode, improving the cooling capacity of the air conditioner and achieving the purpose of energy conservation. In the heating mode, the upper air deflector structure 31, the lower air deflector structure 32, the upper volute tongue and the lower volute tongue move to the corresponding positions, and the cabinet-type air conditioner indoor unit operates in a lower air outlet mode. Using the principle of hot air rising, the return air temperature at the upper air outlet 131 is higher than that of the middle return air mode, reducing the temperature rise time and lowering the blowing feeling index, improving the comfort of the air conditioner.

[0096] The exemplary embodiments of the present disclosure have been specifically illustrated and described above. It should be understood that the present disclosure is not limited to the detailed structures, setting manners or implementation methods described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent settings included within the spirit and scope of the appended claims.

Claims

1. A cabinet-type air conditioner indoor unit, characterized in that, It includes a housing and an air duct assembly. An upper air inlet and an upper intake air opening are formed in the upper part of the housing, and a lower air outlet and a lower intake air opening are formed in the lower part of the housing. The upper air inlet, the upper intake air opening, the lower air outlet, and the lower intake air opening are all in communication with the interior of the room. The air duct assembly is disposed inside the housing, and the air duct assembly forms an upper air blade cavity and a lower air blade cavity which are arranged opposite to each other up and down. The upper air blade cavity forms an upper air blade cavity inlet, an upper air blade cavity A outlet, and an upper air blade cavity B outlet. The lower air blade cavity forms a lower air blade cavity inlet, a lower air blade cavity C outlet, and a lower air blade cavity D outlet. An upper main air duct is communicated between the upper air outlet and the upper air blade cavity A outlet, and an upper auxiliary air duct is communicated between the upper air outlet and the lower air blade cavity C outlet. A lower main air duct is communicated between the lower air outlet and the lower air blade cavity D outlet, and a lower auxiliary air duct is communicated between the lower air outlet and the upper air blade cavity B outlet. An upper air return opening is formed on the side wall of the upper main air duct, and the vertical distance between the upper air return opening and the upper air outlet is greater than the vertical distance between the upper air return opening and the upper air blade cavity. A lower air return opening is formed on the side wall of the lower main air duct, and the vertical distance between the lower air return opening and the lower air outlet is greater than the vertical distance between the lower air return opening and the lower air blade cavity. A communication cavity is formed inside the housing between the upper air return opening and the lower air return opening. The upper air return opening communicates the upper main air duct and the communication cavity, and the lower air return opening communicates the lower main air duct and the communication cavity. The upper intake air opening is communicated with the communication cavity and forms an upper auxiliary flow path, and the lower intake air opening is communicated with the communication cavity and forms a lower auxiliary flow path. The upper air blade cavity A outlet, the upper air blade cavity B outlet, the lower air blade cavity C outlet, the lower air blade cavity D outlet, the upper air return opening, and the lower air return opening can all be controlled to be opened or closed, so that the indoor unit of the cabinet air conditioner can form a first main flow path in which air enters from the lower main air duct and exits simultaneously from the upper main air duct and the upper auxiliary air duct, or a second main flow path in which air enters from the upper main air duct and exits simultaneously from the lower main air duct and the lower auxiliary air duct, or a third main flow path in which air exits simultaneously from the upper main air duct and the lower main air duct.

2. The indoor cabinet air conditioner according to claim 1, characterized in that, When the lower air return opening is in the open state, the upper air return opening is in the closed state, the upper air blade cavity B outlet is in the closed state, and the lower air blade cavity C outlet is in the open state, the lower air outlet, the lower main air duct, the lower air return opening, and the communication cavity are sequentially communicated, the communication cavity, the upper air blade cavity inlet, the upper air blade cavity, the upper main air duct, and the upper air outlet are sequentially communicated, and the communication cavity, the lower air blade cavity inlet, the lower air blade cavity, the upper auxiliary air duct, and the upper air outlet are sequentially communicated. A first main flow path can be formed between the upper air outlet and the lower air outlet. When the lower air return opening is in the closed state, the upper air return opening is in the open state, and the lower air blade cavity C outlet is in the closed state, the upper air outlet, the upper main air duct, the upper air return opening, and the communication cavity are sequentially communicated, the communication cavity, the lower air blade cavity inlet, the lower air blade cavity, the lower main air duct, and the lower air outlet are sequentially communicated, and the communication cavity, the upper air blade cavity inlet, the upper air blade cavity, the lower auxiliary air duct, and the lower air outlet are sequentially communicated. A second main flow path can be formed between the upper air outlet and the lower air outlet. When the upper air return opening, the lower air return opening, the outlet of the upper vane cavity B, and the outlet of the lower vane cavity C are all in the closed state, the communication cavity, the inlet of the upper vane cavity, the upper vane cavity, the upper main air duct, and the upper air outlet are connected in sequence, and the communication cavity, the inlet of the lower vane cavity, the lower vane cavity, the lower main air duct, and the lower air outlet are connected in sequence. The third main flow path can be formed between the upper air outlet and the lower air outlet.

3. The cabinet-type air conditioner indoor unit according to claim 2, characterized in that, An upper wind-blocking structure is movably arranged at the upper air return opening. The upper wind-blocking structure has a first working position for opening the upper air return opening and closing the outlet of the upper vane cavity A, and a second working position for closing the upper air return opening and opening the outlet of the upper vane cavity A. A lower wind-blocking structure is movably arranged at the lower air return opening. The lower wind-blocking structure has a third working position for opening the lower air return opening and closing the outlet of the lower vane cavity D, and a fourth working position for closing the lower air return opening and opening the outlet of the lower vane cavity D. When the upper wind-blocking structure is in the second working position and the lower wind-blocking structure is in the third working position, the first main flow path can be formed between the upper air outlet and the lower air outlet. When the upper wind-blocking structure is in the first working position and the lower wind-blocking structure is in the fourth working position, the second main flow path can be formed between the upper air outlet and the lower air outlet; when the upper wind-blocking structure is in the second working position and the lower wind-blocking structure is in the fourth working position, the third main flow path can be formed between the upper air outlet and the lower air outlet.

4. The cabinet-type air conditioner indoor unit according to claim 2, characterized in that, An upper volute tongue is movably arranged in the upper vane cavity. The structure of the upper volute tongue is adapted to the profile structure of the upper vane cavity; the upper volute tongue has a fifth working position for guiding the air in the upper vane cavity to the outlet of the upper vane cavity A and a sixth working position for guiding the air in the upper vane cavity to the outlet of the upper vane cavity B. A lower volute tongue is movably arranged in the lower vane cavity. The structure of the lower volute tongue is adapted to the profile structure of the lower vane cavity; the lower volute tongue has a seventh working position for guiding the air in the lower vane cavity to the outlet of the lower vane cavity C and an eighth working position for guiding the air in the lower vane cavity to the outlet of the lower vane cavity D. When the upper volute tongue is in the fifth working position and the lower volute tongue is in the seventh working position, the first main flow path can be formed between the upper air outlet and the lower air outlet; when the upper volute tongue is in the sixth working position and the lower volute tongue is in the eighth working position, the second main flow path can be formed between the upper air outlet and the lower air outlet; when the upper volute tongue is in the fifth working position and the lower volute tongue is in the eighth working position, the third main flow path can be formed between the upper air outlet and the lower air outlet.

5. The cabinet-type air conditioner indoor unit according to claim 4, characterized in that, The axis of the upper vane cavity is along the horizontal direction; the inlet of the upper vane cavity is formed at one axial end of the upper vane cavity, the outlet of the upper vane cavity A is formed on the upper side of the upper vane cavity, and the outlet of the upper vane cavity B is formed on the lower side of the lower vane cavity. The axis of the lower vane cavity is along the horizontal direction; the inlet of the lower vane cavity is formed at one axial end of the lower vane cavity, the outlet of the lower vane cavity C is formed on the upper side of the lower vane cavity, and the outlet of the lower vane cavity D is formed on the lower side of the lower vane cavity.

6. The cabinet-type air conditioner indoor unit according to claim 5, characterized in that, The housing includes a rear side wall of the housing; both the upper air blade chamber inlet and the lower air blade chamber inlet face the rear side wall of the housing; The indoor unit further includes an indoor heat exchanger, the indoor heat exchanger includes an upper heat exchange section and a lower heat exchange section, the upper heat exchange section is arranged between the rear side wall of the housing and the upper air blade chamber inlet, and the lower heat exchange section is arranged between the rear side wall of the housing and the lower air blade chamber inlet.

7. The cabinet-type air conditioner indoor unit according to claim 1, characterized in that, The housing further includes a top wall of the housing and a front side wall of the housing, the top wall of the housing forms the upper air outlet; the upper auxiliary air duct is arranged close to the front side wall of the housing, the upper main air duct is arranged at the rear side of the upper auxiliary air duct, and one end of the upper auxiliary air duct close to the upper air outlet and one end of the upper main air duct close to the upper air outlet communicate at the upper air outlet; The front side wall of the housing is arranged at the front side of the bottom of the top wall of the housing, the front side wall of the housing forms the lower air outlet; the lower auxiliary air duct is arranged close to the front side wall of the housing, the lower main air duct is arranged at the rear side of the lower auxiliary air duct, and one end of the lower auxiliary air duct close to the lower air outlet and one end of the lower main air duct close to the lower air outlet communicate at the lower air outlet.

8. The cabinet-type air conditioner indoor unit according to claim 7, characterized in that, The upper air outlet includes an upper auxiliary air outlet and an upper main air outlet arranged front and back, the upper auxiliary air outlet communicates with the upper auxiliary air duct, and the upper main air outlet communicates with the upper main air duct; the lower air outlet includes a lower auxiliary air outlet and a lower main air outlet arranged up and down relatively, the lower auxiliary air outlet communicates with the lower auxiliary air duct, and the lower main air outlet communicates with the lower main air duct.

9. The cabinet-type air conditioner indoor unit according to claim 8, characterized in that, In the direction from the outlet of the upper air blade chamber A to the upper main air outlet, the flow area of the upper main air duct gradually increases; in the direction from the outlet of the lower air blade chamber C to the upper auxiliary air outlet, the flow area of the upper auxiliary air duct gradually increases; In the direction from the outlet of the lower air blade chamber D to the lower main air outlet, the flow area of the lower main air duct gradually increases; in the direction from the outlet of the upper air blade chamber B to the lower auxiliary air outlet, the flow area of the lower auxiliary air duct gradually increases.

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