Cabinet type air conditioner indoor unit and control method

Abstract

The invention provides a cabinet type air conditioner indoor unit and a control method. 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 through which 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 through which 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 through which air exits from the upper main air duct and the lower main air duct at the same time.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioners, and particularly relates to a cabinet air conditioner indoor unit and a control method therefor. Background Art

[0002] In existing cabinet air conditioner indoor units, upper and lower air outlets are formed on the side wall of the housing and are arranged opposite to each other up and down, and an air inlet is formed between the upper air outlet and the lower air outlet; 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 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 hot air with a small density accumulates on the upper side of the room, and the cold air with a large density accumulates on the lower side of the room, resulting in these indoor units being unable to balance the cooling and heating requirements, the uneven temperature distribution of the indoor air, and poor energy-saving and comfort effects. Summary of the Invention

[0003] In view of this, the present invention provides a cabinet air conditioner indoor unit and a control method therefor to solve the problems that in existing cabinet 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 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; 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; 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; a lower air return opening is formed on the side wall of the lower main air duct.

[0006] The flow area between the upper air outlet and the upper main air duct is adjustable, and the flow area between the upper air outlet and the upper auxiliary air duct is adjustable; and / or, the flow area between the lower air outlet and the lower main air duct is adjustable, and the flow area between the lower air outlet and the lower auxiliary air duct is adjustable.

[0007] 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.

[0008] 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 from the upper main air duct and the upper auxiliary air duct simultaneously, or a second main flow path with air entering from the upper main air duct and exiting from the lower main air duct and the lower auxiliary air duct simultaneously, or a third main flow path with air exiting from the upper main air duct and the lower main air duct simultaneously.

[0009] Further optionally, the housing further includes a housing top wall and a housing front side wall. The housing top wall forms the upper air opening, and the upper air opening includes an upper auxiliary air opening and an upper main air opening arranged opposite to each other in the front and rear; the housing front side wall is arranged on the front side of the bottom of the housing top wall, and the housing front side wall forms the lower air opening, and the lower air opening includes a lower auxiliary air opening and a lower main air opening arranged opposite to each other in the up and down.

[0010] The upper auxiliary air duct is arranged close to the housing front side wall and communicates with the upper auxiliary air opening; the upper main air duct is arranged behind the upper auxiliary air duct and communicates with the upper main air opening; the lower auxiliary air duct is arranged close to the housing front side wall and communicates with the lower auxiliary air opening, and the lower main air duct is arranged behind the lower auxiliary air duct and communicates with the lower main air opening.

[0011] Further optionally, an upper partition is movably arranged between the end of the upper main air duct close to the upper main air opening and the end of the upper auxiliary air duct close to the upper auxiliary air opening. The upper partition can move to connect or disconnect the upper main air duct and the upper main air opening or adjust the flow area between the upper main air duct and the upper main air opening, and also to connect or disconnect the upper auxiliary air duct and the upper auxiliary air opening or adjust the flow area between the upper auxiliary air duct and the upper auxiliary air opening; when the upper partition moves, it can guide the air flow from the upper main air opening and the upper auxiliary air opening; and / or,

[0012] A lower partition is movably arranged between the end of the lower main air duct close to the lower main air opening and the end of the lower auxiliary air duct close to the lower auxiliary air opening. The lower partition can move to connect or disconnect the lower main air duct and the lower main air opening or adjust the flow area between the lower main air duct and the lower main air opening, and also to connect or disconnect the lower auxiliary air duct and the lower auxiliary air opening or adjust the flow area between the lower auxiliary air duct and the lower auxiliary air opening; when the lower partition moves, it can guide the air flow from the lower main air opening and the lower auxiliary air opening.

[0013] Further optionally, when the lower air return opening is in an open state, the upper air return opening is in a closed state, the upper air blade cavity B outlet is in a closed state, and the lower air blade cavity C outlet is in an 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;

[0014] When the lower air return opening is in a closed state, the upper air return opening is in an open state, and the lower air blade cavity C outlet is in a 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;

[0015] When the upper air return opening, the lower air return opening, the upper air blade cavity B outlet, and the lower air blade cavity C outlet are all in a 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.

[0016] Further optionally, an upper wind shielding structure is movably arranged at the upper air return opening, and the upper wind shielding structure has a first working position for opening the upper air return opening and closing the upper air blade cavity A outlet at the same time and a second working position for closing the upper air return opening and opening the upper air blade cavity A outlet at the same time;

[0017] A lower wind shielding structure is movably arranged at the lower air return opening, and the lower wind shielding structure has a third working position for opening the lower air return opening and closing the lower air blade cavity D outlet at the same time and a fourth working position for closing the lower air return opening and opening the lower air blade cavity D outlet at the same time;

[0018] When the upper wind shielding structure is in the second working position and the lower wind shielding 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 shielding structure is in the first working position and the lower wind shielding 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 shielding structure is in the second working position and the lower wind shielding 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.

[0019] Further optionally, an upper volute tongue is movably arranged in the upper blower cavity, and the structure of the upper volute tongue is adapted to the profile structure of the upper blower cavity; the upper volute tongue has a fifth working position for guiding the air in the upper blower cavity to the outlet A of the upper blower cavity and a sixth working position for guiding the air in the upper blower cavity to the outlet B of the upper blower cavity;

[0020] A lower volute tongue is movably arranged in the lower blower cavity, and the structure of the lower volute tongue is adapted to the profile structure of the lower blower cavity; the lower volute tongue has a seventh working position for guiding the air in the lower blower cavity to the outlet C of the lower blower cavity and an eighth working position for guiding the air in the lower blower cavity to the outlet D of the lower blower cavity;

[0021] 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 inlet and the lower air inlet; 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 inlet and the lower air inlet; 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 inlet and the lower air inlet.

[0022] Further optionally, the axis of the upper blower cavity is in the horizontal direction; the inlet of the upper blower cavity is formed at one axial end of the upper blower cavity, the outlet A of the upper blower cavity is formed on the upper side of the upper blower cavity, and the outlet B of the upper blower cavity is formed on the lower side of the lower blower cavity;

[0023] The axis of the lower blower cavity is in the horizontal direction; the inlet of the lower blower cavity is formed at one axial end of the lower blower cavity, the outlet C of the lower blower cavity is formed on the upper side of the lower blower cavity, and the outlet D of the lower blower cavity is formed on the lower side of the lower blower cavity.

[0024] Further optionally, the housing includes a rear side wall of the housing; the inlets of the upper blower cavity and the lower blower cavity both face the rear side wall of the housing;

[0025] The cabinet-type air conditioner indoor unit further includes an indoor heat exchanger, and 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 inlet of the upper blower cavity, and the lower heat exchange section is arranged between the rear side wall of the housing and the inlet of the lower blower cavity.

[0026] The present invention also provides a control method for a cabinet-type air conditioner indoor unit, and the cabinet-type air conditioner indoor unit is the cabinet-type air conditioner indoor unit described in any one of the above; the control method includes:

[0027] Determine the target operation mode of the cabinet-type air conditioner indoor unit;

[0028] Calculate the temperature difference between the current temperature and the preset temperature of the indoor air;

[0029] Determine the target main flow path and the target main air outlet duct according to the target operation mode and the temperature difference;

[0030] Wherein, the target operation mode is a heating mode or a cooling mode, the target main flow path is the first main flow path or the second main flow path; when the target main flow path is the first main flow path, the target main air outlet duct is one of the upper main air duct and the upper auxiliary air duct; when the target main flow path is the second main flow path, the target main air outlet duct is one of the lower main air duct and the lower auxiliary air duct.

[0031] Further optionally, the determining the target main flow path and the target main air outlet duct according to the target operation mode and the temperature difference includes:

[0032] When the target operation mode is the cooling mode and the temperature difference is within a preset temperature range, determine that the target main flow path is the first main flow path and the target main air outlet duct is the upper auxiliary air duct, so that the flow area between the upper air inlet and the upper main air duct is smaller than the flow area between the upper air inlet and the upper auxiliary air duct;

[0033] When the target operation mode is the cooling mode and the temperature difference is not within the preset temperature range, determine that the target main flow path is the first main flow path and the target main air outlet duct is the upper main air duct, so that the flow area between the upper air inlet and the upper main air duct is larger than the flow area between the upper air inlet and the upper auxiliary air duct.

[0034] Further optionally, the determining the target main flow path and the target main air outlet duct according to the target operation mode and the temperature difference includes:

[0035] When the target operation mode is the heating mode and the temperature difference is within a preset temperature range, determine that the target main flow path is the second main flow path and the target main air outlet duct is the lower auxiliary air duct, so that the flow area between the lower air inlet and the lower main air duct is smaller than the flow area between the lower air inlet and the lower auxiliary air duct;

[0036] When the target operation mode is the heating mode and the temperature difference is not within the preset temperature range, determine that the target main flow path is the second main flow path and the target main air outlet duct is the lower main air duct, so that the flow area between the lower air inlet and the lower main air duct is larger than the flow area between the lower air inlet and the lower auxiliary air duct.

[0037] Compared with the prior art, the beneficial effects of the present invention mainly lie in:

[0038] The positions of the upper air inlet and the lower air inlet are optimized, enabling reversible up-and-down air output and simultaneous up-and-down air output; taking into account the cooling and heating requirements, making full use of the principles that cold air sinks during cooling and hot air rises during heating, expanding the airflow range, and forming large swirling eddies of air in the room where the indoor unit is located; adding upper and lower air inlets to increase the air intake volume; being able to supply air 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 circuits, and improving the air comfort level. Description of the Drawings

[0039] 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 in the following description 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.

[0040] The structures, ratios, sizes, etc. depicted 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 limiting conditions for the implementation of the present invention. Therefore, they do not have any technical essence. 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.

[0041] 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;

[0042] 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;

[0043] 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;

[0044] 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;

[0045] 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;

[0046] Figure 6a and Figure 6bSchematic structural diagram of an embodiment when the cabinet-type air conditioner indoor unit provided by the present invention is in the upper air outlet mode;

[0047] Figure 7a and Figure 7b Schematic structural diagram of an embodiment when the cabinet-type air conditioner indoor unit provided by the present invention is in the lower air outlet mode;

[0048] Figure 8a and Figure 8b Schematic structural diagram of an embodiment when the cabinet-type air conditioner indoor unit provided by the present invention is in the upper and lower simultaneous air outlet mode;

[0049] Figure 9a and Figure 9b Schematic assembly structure diagram of the upper ventilation shell and the upper partition provided by the present invention;

[0050] Figure 10a and Figure 10b Schematic assembly structure diagram of the lower ventilation shell and the lower partition provided by the present invention;

[0051] In the figure:

[0052] 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;

[0053] 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 air return opening; 253 - upper auxiliary air duct; 261 - lower main air duct; 262 - lower air return opening; 263 - lower auxiliary air duct; 27 - upper ventilation shell; 271 - upper ventilation duct; 28 - lower ventilation shell; 281 - lower ventilation duct;

[0054] 31 - upper wind shielding structure; 32 - lower wind shielding structure; 33 - upper volute tongue; 34 - lower volute tongue; 35 - upper partition; 36 - lower partition; 41 - upper heat exchange section; 42 - lower heat exchange section. Detailed implementation manners

[0055] 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 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.

[0056] 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", "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.

[0057] It should be understood that the term "and / or" used herein 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 simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0058] It should also be noted that the terms "comprising", "including" or any other variants thereof are 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 explicitly listed, or further includes elements inherent to such commodity or system. Without more limitations, the element defined by the statement "including one..." does not exclude the existence of another identical element in the commodity or system including the said element.

[0059] In the existing cabinet-type air conditioner indoor unit, upper air outlets and lower air outlets are formed on the side wall of the housing and are arranged opposite to each other up and down, and an air inlet is formed between the upper air outlet and the lower air outlet; by blowing air through the upper air outlet, shower-type cooling can be achieved, and by blowing air through the lower air outlet, carpet-type heating can be achieved; however, the air inlet is located on the back of the indoor unit, and during installation, a certain safety distance needs to be reserved between the indoor unit and the wall, 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 change of the temperature of the indoor air, and the time required for the room where the indoor unit is located to reach the set temperature;

[0060] The present invention creatively provides a cabinet-type 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;

[0061] The air duct assembly is arranged 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;

[0062] 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;

[0063] 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;

[0064] The positions of the upper air inlet and the lower air inlet are optimized, and up-and-down reversible air outlet and up-and-down simultaneous air outlet can be realized; taking into account the cooling and heating requirements, making full use of the principles that cold air sinks during cooling and hot air rises during heating, the airflow range is expanded, and large swirling eddies are formed in the room where the indoor unit is located; the upper air inlet and the lower air inlet are increased, and the air intake is increased; air can be supplied through both the main air duct and the auxiliary air duct, the air supply volume is increased, the temperature change speed of the indoor air is increased, the vertical temperature difference in the room is reduced, the temperature distribution of the indoor air is made uniform, air flow short-circuit is avoided, and the air comfort is improved.

[0065] Embodiment 1

[0066] <Cabinet-type air conditioner indoor unit>

[0067] 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 are all communicated with the indoor;

[0068] 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; a main upper air duct 251 is communicated between the upper air inlet 131 and the upper air blade cavity A outlet 232, and a secondary upper air duct 253 is communicated between the upper air inlet 131 and the lower air blade cavity C outlet 242; a main lower air duct 261 is communicated between the lower air outlet and the lower air blade cavity D outlet 243, and a secondary lower air duct 263 is communicated between the lower air outlet and the upper air blade cavity B outlet 233; a return air inlet 252 is formed on the side wall of the main upper air duct 251, and a return air inlet 262 is formed on the side wall of the main lower air duct 261;

[0069] The flow area between the upper air inlet 131 and the main upper air duct 251 is adjustable, and the flow area between the upper air inlet 131 and the secondary upper air duct 253 is adjustable; and / or, the flow area between the lower air outlet and the main lower air duct 261 is adjustable, and the flow area between the lower air outlet and the secondary lower air duct 263 is adjustable;

[0070] A communication cavity 14 is formed inside the housing 1 between the return air inlet 252 and the return air inlet 262; the return air inlet 252 communicates the main upper air duct 251 and the communication cavity 14, and the air in the main upper air duct 251 can enter the communication cavity 14 through the return air inlet 252; the return air inlet 262 communicates the main lower air duct 261 and the communication cavity 14, and the air in the main lower air duct 261 can enter the communication cavity 14 through the return air inlet 262; the upper air inlet 132 is communicated 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 is communicated 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;

[0071] 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 return air inlet 252 and the return air inlet 262 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 with air entering from the main lower air duct 261 and air exiting simultaneously from the main upper air duct 251 and the secondary upper air duct 253, or a second main flow path with air entering from the main upper air duct 251 and air exiting simultaneously from the main lower air duct 261 and the secondary lower air duct 263, or a third main flow path with air exiting simultaneously from the main upper air duct 251 and the main lower air duct 261;

[0072] Specifically, ① the upper air outlet mode of the floor-standing air conditioner;

[0073] 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, 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, then is discharged through the upper auxiliary air duct 253 and the upper air outlet 131;

[0074] ② the lower air outlet mode of the floor-standing air conditioner;

[0075] 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, 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, then is discharged through the lower auxiliary air duct 253 and the lower air outlet;

[0076] ③ the upper and lower simultaneous air outlet mode of the floor-standing air conditioner;

[0077] 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, 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, then is discharged through the lower main air duct 261 and the lower air outlet.

[0078] Regarding the problem that the open or closed 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 are inappropriate, resulting in the disconnection of the corresponding flow paths, this embodiment proposes 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, and 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;

[0079] 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;

[0080] 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, and a third main flow path can be formed between the upper air inlet 131 and the lower air inlet.

[0081] 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 which 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. 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. 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.

[0082] Further, an upper air dam structure 31 is movably arranged at the upper air return opening 252. The upper air dam structure 31 has a first working position for opening the upper air return opening 252 while closing the outlet 232 of the upper air blade cavity A, and a second working position for closing the upper air return opening 252 while opening the outlet 232 of the upper air blade cavity A. Preferably, the upper air dam structure 31 is an upper baffle, and the upper baffle is rotatably arranged at the upper air return opening 252.

[0083] A lower air dam structure 32 is movably arranged at the lower air return opening 262. The lower air dam structure 32 has a third working position for opening the lower air return opening 262 while closing the outlet 243 of the lower air blade cavity D, and a fourth working position for closing the lower air return opening 262 while opening the outlet 243 of the lower air blade cavity D. Preferably, the lower air dam structure 32 is a lower baffle, and the lower baffle is rotatably arranged at the lower air return opening 262.

[0084] When the upper air dam structure 31 is in the second working position and the lower air dam 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 air dam structure 31 is in the first working position and the lower air dam 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.

[0085] 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 air dam structure 31 is in the second working position, and the lower air dam 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.

[0086] When the cabinet-type 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. 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. 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.

[0087] When the cabinet-type 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. 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 lower main air duct 261 and the lower air outlet.

[0088] 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 volute tongue 33 is movably arranged in the upper air blade cavity 23, and the structure of the upper volute tongue 33 is adapted to the profile structure of the upper air blade cavity 23; the upper volute 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;

[0089] 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 volute tongue 34 is movably arranged in the lower air blade cavity 24, and the structure of the lower volute tongue 34 is adapted to the profile structure of the lower air blade cavity 24; the lower volute 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;

[0090] 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 outlet; 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 outlet; 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 outlet.

[0091] Aiming at the problem that the unreasonable structural design of the upper blade cavity 23 and the lower blade cavity 24 leads to large air flow resistance, in this embodiment, it is proposed that the axial direction of the upper blade cavity 23 is along the horizontal direction; the upper blade cavity inlet 231 is formed at one axial end of the upper blade cavity 23, the upper blade cavity A outlet 232 is formed at the top of the upper blade cavity 23, and the upper blade cavity B outlet 233 is formed at the bottom of the lower blade cavity 24;

[0092] The axial direction of the lower blade cavity 24 is along the horizontal direction; the lower blade cavity inlet 241 is formed at one axial end of the lower blade cavity 24, the lower blade cavity C outlet 242 is formed at the top of the lower blade cavity 24, and the lower blade cavity D outlet 243 is formed at the bottom of the lower blade cavity 24.

[0093] 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, and the upper air inlet 131 is located in front of the upper air intake 132; the housing front side wall 11 is arranged on the front side of the bottom of the housing top wall 13, and a lower air outlet is formed at the lower part of the housing front side wall 11. The lower air outlet includes a lower auxiliary air outlet 111 and a lower main air outlet 112 which are arranged up and down relatively; 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;

[0094] The upper auxiliary 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 auxiliary air duct 253 and communicated with the upper air inlet 131; the lower auxiliary air duct 263 is arranged close to the housing front side wall 11 and communicated with the lower auxiliary air outlet 111, and the lower main air duct 261 is arranged at the rear side of the lower auxiliary air duct 263 and communicated with the lower main air outlet 112.

[0095] Furthermore, both the upper blade cavity inlet 231 and the lower blade cavity inlet 241 face the housing rear side wall 12;

[0096] The cabinet-type air conditioner indoor unit further includes an indoor heat exchanger. The indoor heat exchanger 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. 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. 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. From bottom to top, the flow area of the lower heat exchange area gradually decreases.

[0097] 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 and the left side wall of the housing are correspondingly arranged. The right side wall of the upper main air duct and the right side wall of the housing are correspondingly arranged. 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.

[0098] 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 and the left side wall of the housing are correspondingly arranged. The right side wall of the lower main air duct and the right side wall of the housing are correspondingly arranged. 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.

[0099] The air duct assembly 2 further includes an upper ventilation housing 27 and a lower ventilation housing 28. 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. 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.

[0100] The lower ventilation housing 28 is provided 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 inlet with the lower main air duct 261 and the lower air inlet with the lower auxiliary air duct 263.

[0101] In addition, the upper air inlet 131 includes an upper auxiliary air inlet and an upper main air inlet which are arranged opposite to each other in the front and back; the lower air inlet includes a lower auxiliary air inlet 111 and a lower main air inlet 112 which are arranged opposite to each other in the up and down;

[0102] The upper auxiliary air duct 253 is arranged close to the front side wall 11 of the housing and communicates with the upper auxiliary air inlet; the upper main air duct 251 is arranged at the rear side of the upper auxiliary air duct 252 and communicates with the upper main air inlet; the lower auxiliary air duct 263 is arranged close to the front side wall 11 of the housing and communicates with the lower auxiliary air inlet 111, and the lower main air duct 261 is arranged at the rear side of the lower auxiliary air duct 263 and communicates with the lower main air inlet 112.

[0103] In view of the problem that the temperature distributions of the air discharged through the upper main air duct 251 and the air discharged through the upper auxiliary air duct 253 are uneven, this embodiment proposes that an upper partition plate 35 is movably arranged between the end of the upper main air duct 251 close to the upper main air inlet and the end of the upper auxiliary air duct 253 close to the upper auxiliary air inlet. The upper partition plate 35 can move to connect or disconnect the upper main air duct 251 and the upper main air inlet or adjust the flow area between the upper main air duct 251 and the upper main air inlet, so as to connect or disconnect the upper auxiliary air duct 253 and the upper auxiliary air inlet or adjust the flow area between the upper auxiliary air duct 253 and the upper auxiliary air inlet; when the upper partition plate 35 moves, it can guide the air flow out of the upper main air inlet and the upper auxiliary air inlet; specifically, the upper partition plate 35 is swingably arranged in the upper ventilation duct in the front and back, and thus the upper partition plate 35 plays a role in guiding the air flow and adjusting the flow area between the upper main air duct 251 and the upper main air inlet or the flow area between the upper auxiliary air duct 253 and the upper auxiliary air inlet.

[0104] In view of the problem that the temperature distributions of the air discharged through the lower main air duct 261 and the air discharged through the lower auxiliary air duct 263 are uneven, this embodiment proposes that a lower partition plate 36 is movably arranged between the end of the lower main air duct 261 close to the lower main air inlet 112 and the end of the lower auxiliary air duct 263 close to the lower auxiliary air inlet 111. The lower partition plate 36 can move to connect or disconnect the lower main air duct 261 and the lower main air inlet 112 or adjust the flow area between the lower main air duct 261 and the lower main air inlet 112, so as to connect or disconnect the lower auxiliary air duct 263 and the lower auxiliary air inlet 111 or adjust the flow area between the lower auxiliary air duct 263 and the lower auxiliary air inlet 111; when the lower partition plate 36 moves, it can guide the air flow out of the lower main air inlet 112 and the lower auxiliary air inlet 111; specifically, the lower partition plate 36 is swingably arranged in the lower ventilation duct in the up and down, and thus the lower partition plate 36 plays a role in guiding the air flow and adjusting the flow area between the lower main air duct 261 and the lower main air inlet 112 or the flow area between the lower auxiliary air duct 263 and the lower auxiliary air inlet 111.

[0105] <Control Method>

[0106] This embodiment further provides a control method for a cabinet-type air conditioner indoor unit, where the cabinet-type air conditioner indoor unit is the cabinet-type air conditioner indoor unit described in any one of the above; the control method includes:

[0107] S1. Determine the target operation mode of the cabinet-type air conditioner indoor unit;

[0108] S2. Calculate the temperature difference between the current temperature and the preset temperature of the indoor air;

[0109] S3. Determine the target main flow path and the target main air outlet duct according to the target operation mode and the temperature difference;

[0110] Among them, the target operation mode is the heating mode or the cooling mode, and the target main flow path is the first main flow path or the second main flow path; when the target main flow path is the first main flow path, the target main air outlet duct is one of the upper main air duct 251 and the upper auxiliary air duct 253; when the target main flow path is the second main flow path, the target main air outlet duct is one of the lower main air duct 261 and the lower auxiliary air duct 263.

[0111] Further, S3 includes:

[0112] S31. When the target operation mode is the cooling mode and the temperature difference is within the preset temperature range, determine that the target main flow path is the first main flow path and the target main air outlet duct is the upper auxiliary air duct 253, so that the flow area between the upper air inlet 131 and the upper main air duct 251 is smaller than the flow area between the upper air inlet 131 and the upper auxiliary air duct 253;

[0113] S32. When the target operation mode is the cooling mode and the temperature difference is not within the preset temperature range, determine that the target main flow path is the first main flow path and the target main air outlet duct is the upper main air duct 251, so that the flow area between the upper air inlet 131 and the upper main air duct 251 is larger than the flow area between the upper air inlet 131 and the upper auxiliary air duct 253.

[0114] S33. When the target operation mode is the heating mode and the temperature difference is within the preset temperature range, determine that the target main flow path is the second main flow path and the target main air outlet duct is the lower auxiliary air duct 263, so that the flow area between the lower air inlet and the lower main air duct 261 is smaller than the flow area between the lower air inlet and the lower auxiliary air duct 263;

[0115] S34. When the target operation mode is the heating mode and the temperature difference is not within the preset temperature range, determine that the target main flow path is the second main flow path and the target main air outlet duct is the lower main air duct 261, so that the flow area between the lower air inlet and the lower main air duct 261 is larger than the flow area between the lower air inlet and the lower auxiliary air duct 263.

[0116] The control method further includes:

[0117] S4. Determine the target operating mode of the cabinet air conditioner indoor unit;

[0118] S5. Control the upper air deflector structure 31, the lower air deflector structure 32, the upper volute tongue 33 and the lower volute tongue 34 according to the target operating mode, so that the air duct assembly 2 forms a target flow path;

[0119] Among them, the target flow path is the first main flow path, the second main flow path or the third main flow path.

[0120] Further, S5 includes:

[0121] When the target operating mode is the cooling mode, control the upper air deflector structure 31 to move so that the upper air deflector structure 31 is in the second working position; control the lower air deflector structure 32 to move so that the lower air deflector 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 the first main flow path;

[0122] When the target operating mode is the heating mode, control the upper air deflector structure 31 to move so that the upper air deflector structure 31 is in the first working position; control the lower air deflector structure 32 to move so that the lower air deflector 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 the second main flow path;

[0123] When the target operating mode is the cooling mode or the heating mode, control the upper air deflector structure 31 to move so that the upper air deflector structure 31 is in the second working position; control the lower air deflector structure 32 to move so that the lower air deflector 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 the third main flow path.

[0124] By optimizing the structure of the air duct assembly 2, the cabinet air conditioner indoor unit operates in different air inlet and outlet manners under different working conditions and different 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 air conditioner indoor unit operates in an upper air outlet manner. Using the principle that cold air sinks, the return air temperature at the lower air outlet is lower than the air temperature in the middle return air manner, improving the cooling capacity of the air conditioner and achieving the purpose of energy saving; 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 air conditioner indoor unit operates in a lower air outlet manner. Using the principle that hot air rises, the return air temperature at the upper air outlet 131 is higher than the air temperature in the middle return air manner, reducing the temperature rise time and lowering the blowing feeling index, improving the comfort of the air conditioner;

[0125] The exemplary embodiments of the present disclosure have been specifically shown and described above. It should be understood that the present disclosure is not limited to the detailed structures, arrangements or implementation methods described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent arrangements 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 inlet air vent are formed in the upper part of the housing, and a lower air outlet and a lower inlet air vent are formed in the lower part of the housing. The upper air inlet, the upper inlet air vent, the lower air outlet, and the lower inlet air vent are all in communication with the interior of the room. 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. 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 connected between the upper air inlet and the upper air blade cavity A outlet, and an upper auxiliary air duct is connected between the upper air inlet and the lower air blade cavity C outlet. A lower main air duct is connected between the lower air outlet and the lower air blade cavity D outlet, and a lower auxiliary air duct is connected 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. A lower air return opening is formed on the side wall of the lower main air duct. The flow area between the upper air inlet and the upper main air duct is adjustable, and the flow area between the upper air inlet and the upper auxiliary air duct is adjustable. And / or, the flow area between the lower air outlet and the lower main air duct is adjustable, and the flow area between the lower air outlet and the lower auxiliary air duct is adjustable. 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 inlet air vent is in communication with the communication cavity and forms an upper auxiliary flow path, and the lower inlet air vent is in communication 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 with air entering from the lower main air duct and simultaneously exiting 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 simultaneously exiting from the lower main air duct and the lower auxiliary air duct, or a third main flow path with air simultaneously exiting from the upper main air duct and the lower main air duct.

2. The cabinet-type air conditioner indoor unit according to claim 1, characterized in that, The housing further includes a housing top wall and a housing front side wall. The housing top wall forms the upper air inlet, and the upper air inlet includes an upper auxiliary air inlet and an upper main air inlet which are arranged opposite to each other front and back. The housing front side wall is arranged on the front side of the bottom of the housing top wall, and the housing front side wall forms the lower air outlet. The lower air outlet includes a lower auxiliary air outlet and a lower main air outlet which are arranged opposite to each other up and down. The upper auxiliary air duct is arranged close to the housing front side wall and is connected to the upper auxiliary air inlet. The upper main air duct is arranged behind the upper auxiliary air duct and is connected to the upper main air inlet. The lower auxiliary air duct is arranged close to the housing front side wall and is connected to the lower auxiliary air outlet. The lower main air duct is arranged behind the lower auxiliary air duct and is connected to the lower main air outlet.

3. The cabinet-type air conditioner indoor unit according to claim 2, characterized in that, An upper partition is movably arranged between the end of the upper main air duct near the upper main air outlet and the end of the upper auxiliary air duct near the upper auxiliary air outlet. The upper partition can move to connect or disconnect the upper main air duct and the upper main air outlet or adjust the flow area between the upper main air duct and the upper main air outlet, and to connect or disconnect the upper auxiliary air duct and the upper auxiliary air outlet or adjust the flow area between the upper auxiliary air duct and the upper auxiliary air outlet. When the upper partition moves, it can guide the air flow from the upper main air outlet and the upper auxiliary air outlet. and / or A lower partition is movably arranged between the end of the lower main air duct near the lower main air outlet and the end of the lower auxiliary air duct near the lower auxiliary air outlet. The lower partition can move to connect or disconnect the lower main air duct and the lower main air outlet or adjust the flow area between the lower main air duct and the lower main air outlet, and to connect or disconnect the lower auxiliary air duct and the lower auxiliary air outlet or adjust the flow area between the lower auxiliary air duct and the lower auxiliary air outlet. When the lower partition moves, it can guide the air flow from the lower main air outlet and the lower auxiliary air outlet.

4. The indoor unit of the cabinet air conditioner according to claim 1, characterized in that, When the lower return air outlet is in the open state, the upper return air outlet 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 return air outlet, and the communication cavity are connected in sequence. The communication cavity, the inlet of the upper air blade cavity, the upper air blade cavity, the upper main air duct, and the upper air outlet are connected in sequence. And the communication cavity, the inlet of the lower air blade cavity, the lower air blade cavity, the upper auxiliary air duct, and the upper air outlet are connected in sequence. A first main flow path can be formed between the upper air outlet and the lower air outlet. When the lower return air outlet is in the closed state, the upper return air outlet 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 return air outlet, and the communication cavity are connected in sequence. The communication cavity, the inlet of the lower air blade cavity, the lower air blade cavity, the lower main air duct, and the lower air outlet are connected in sequence. And the communication cavity, the inlet of the upper air blade cavity, the upper air blade cavity, the lower auxiliary air duct, and the lower air outlet are connected in sequence. A second main flow path can be formed between the upper air outlet and the lower air outlet. When the upper return air outlet, the lower return air outlet, 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 inlet of the upper air blade cavity, the upper air blade cavity, the upper main air duct, and the upper air outlet are connected in sequence. And the communication cavity, the inlet of the lower air blade cavity, the lower air blade cavity, the lower main air duct, and the lower air outlet are connected in sequence. A 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, An upper wind blocking structure is movably arranged at the upper return air outlet. The upper wind blocking structure has a first working position for opening the upper return air outlet while closing the outlet of the upper air blade cavity A and a second working position for closing the upper return air outlet while opening the outlet of the upper air blade cavity A. A lower wind blocking structure is movably arranged at the lower return air outlet. The lower wind blocking structure has a third working position for opening the lower return air outlet while closing the outlet of the lower air blade cavity D and a fourth working position for closing the lower return air outlet while opening the outlet of the lower air blade cavity D. When the upper wind shield structure is in the second working position and the lower wind shield 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 shield structure is in the first working position and the lower wind shield 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 shield structure is in the second working position and the lower wind shield 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.

6. The cabinet-type air conditioner indoor unit according to claim 4, characterized in that, An upper volute tongue is movably arranged in the upper wind impeller cavity, and the structure of the upper volute tongue is adapted to the profile structure of the upper wind impeller cavity; the upper volute tongue has a fifth working position for guiding the air in the upper wind impeller cavity to the A outlet of the upper wind impeller cavity and a sixth working position for guiding the air in the upper wind impeller cavity to the B outlet of the upper wind impeller cavity; A lower volute tongue is movably arranged in the lower wind impeller cavity, and the structure of the lower volute tongue is adapted to the profile structure of the lower wind impeller cavity; the lower volute tongue has a seventh working position for guiding the air in the lower wind impeller cavity to the C outlet of the lower wind impeller cavity and an eighth working position for guiding the air in the lower wind impeller cavity to the D outlet of the lower wind impeller cavity; 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.

7. The cabinet-type air conditioner indoor unit according to claim 6, wherein The axis of the upper wind impeller cavity is along the horizontal direction; the inlet of the upper wind impeller cavity is formed at one axial end of the upper wind impeller cavity, the A outlet of the upper wind impeller cavity is formed on the upper side of the upper wind impeller cavity, and the B outlet of the upper wind impeller cavity is formed on the lower side of the lower wind impeller cavity; The axis of the lower wind impeller cavity is along the horizontal direction; the inlet of the lower wind impeller cavity is formed at one axial end of the lower wind impeller cavity, the C outlet of the lower wind impeller cavity is formed on the upper side of the lower wind impeller cavity, and the D outlet of the lower wind impeller cavity is formed on the lower side of the lower wind impeller cavity; The housing includes a rear side wall of the housing; the inlets of the upper wind impeller cavity and the lower wind impeller cavity both face the rear side wall of the housing; the cabinet-type air conditioner indoor unit further includes an indoor heat exchanger, and 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 inlet of the upper wind impeller cavity, and the lower heat exchange section is arranged between the rear side wall of the housing and the inlet of the lower wind impeller cavity.

8. A control method for an indoor unit of a cabinet air conditioner, characterized in that, The cabinet-type air conditioner indoor unit is the cabinet-type air conditioner indoor unit according to any one of claims 1 to 7; the control method includes: Determine the target operation mode of the cabinet-type air conditioner indoor unit; Calculate the temperature difference between the current temperature and the preset temperature of the indoor air; Determine the target main flow path and the target main air outlet duct according to the target operation mode and the temperature difference; Wherein, the target operation mode is the heating mode or the cooling mode, and the target main flow path is the first main flow path or the second main flow path; when the target main flow path is the first main flow path, the target main air outlet duct is one of the upper main air duct and the upper auxiliary air duct; when the target main flow path is the second main flow path, the target main air outlet duct is one of the lower main air duct and the lower auxiliary air duct.

9. The control method of the cabinet air conditioner indoor unit according to claim 8, wherein, Determining the target main flow path and the target main air outlet duct according to the target operation mode and the temperature difference includes: When the target operation mode is the cooling mode and the temperature difference is within a preset temperature range, determining the target main flow path as the first main flow path and the target main air outlet duct as the upper auxiliary air duct, so that the flow area between the upper air outlet and the upper main air duct is smaller than the flow area between the upper air outlet and the upper auxiliary air duct; When the target operation mode is the cooling mode and the temperature difference is not within the preset temperature range, determining the target main flow path as the first main flow path and the target main air outlet duct as the upper main air duct, so that the flow area between the upper air outlet and the upper main air duct is larger than the flow area between the upper air outlet and the upper auxiliary air duct.

10. The control method of the cabinet air conditioner indoor unit according to claim 8, characterized in that, Determining the target main flow path and the target main air outlet duct according to the target operation mode and the temperature difference includes: When the target operation mode is the heating mode and the temperature difference is within a preset temperature range, determining the target main flow path as the second main flow path and the target main air outlet duct as the lower auxiliary air duct, so that the flow area between the lower air outlet and the lower main air duct is smaller than the flow area between the lower air outlet and the lower auxiliary air duct; When the target operation mode is the heating mode and the temperature difference is not within the preset temperature range, determining the target main flow path as the second main flow path and the target main air outlet duct as the lower main air duct, so that the flow area between the lower air outlet and the lower main air duct is larger than the flow area between the lower air outlet and the lower auxiliary air duct.

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