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. A shell cavity is defined by the shell, an upper air opening is formed in the front side of the top wall of the shell, and a lower air opening is formed in the lower side of the front side wall of the shell. An upper air inlet is formed in the rear side of the top wall of the shell, and a lower air inlet is formed in the lower side of the rear side wall of the shell. The air duct assembly is arranged in the shell cavity and forms an upper air duct, an upper fan blade cavity, a lower fan blade cavity and a lower air duct which are sequentially arranged from top to bottom, the upper air port, the upper air duct and an outlet of the upper fan blade cavity are sequentially communicated, and an upper air return port is formed in the side wall of the upper air duct; a lower air return opening is formed in the side wall of the lower air duct; opening or closing of the upper return air inlet and the lower return air inlet is controlled, communication or disconnection of the upper air channel and the upper fan blade cavity outlet and communication or disconnection of the lower air channel and the lower fan blade cavity outlet are controlled, and an upper air outlet mode, a lower air outlet mode and an up-down simultaneous air outlet mode can be achieved.

Description

Technical Field

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

[0002] When a cabinet-type air conditioner is operating, due to the difference in air density, there is an uneven phenomenon of temperature stratification in the height direction, resulting in a large vertical temperature difference in the room where the indoor unit is located, thereby affecting the air comfort. The position of the air inlet, the position of the air outlet, and the air flow path are the key factors affecting the vertical temperature; in the prior art, the housing is formed with an upper air outlet, a lower air outlet, and an air inlet; 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 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, the air flow range is narrow, and the time required to reduce the vertical temperature difference in the room where the indoor unit is located is increased. Summary of the Invention

[0003] In view of this, the present invention provides a cabinet-type air conditioner indoor unit and a control method therefor, so as to solve the problems in the existing cabinet-type air conditioners that the unreasonable setting of the positions of the air inlet and the air outlet easily causes air flow short circuit, the air flow range is narrow, and the time required to reduce the vertical temperature difference in the room where the indoor unit is located is increased.

[0004] The present invention provides a cabinet-type air conditioner indoor unit, including a housing and an air duct assembly; the housing encloses a housing cavity, and 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, and the upper air inlet and the lower air inlet are both communicated with the housing cavity;

[0005] The air duct assembly is disposed in the housing cavity, and the air duct assembly is formed with an upper air duct, an upper air blade cavity, a lower air blade cavity, and a lower air duct which are sequentially arranged from top to bottom. The upper air blade cavity includes an upper air blade cavity inlet and an upper air blade cavity outlet; the upper air duct communicates the upper air outlet and the upper air blade cavity outlet, and an upper air return opening is formed on the side wall of the upper air duct; the lower air blade cavity includes a lower air blade cavity inlet and a lower air blade cavity outlet; the lower air duct communicates the lower air outlet and the lower air blade cavity outlet, and a lower air return opening is formed on the side wall of the lower air duct;

[0006] The upper air return opening communicates the upper air duct and the housing cavity, and the lower air return opening communicates the lower air duct and the housing cavity; the upper air blade cavity inlet communicates the upper air blade cavity and the housing cavity, and the lower air blade cavity inlet communicates the lower air blade cavity and the housing cavity;

[0007] Both the upper air return opening and the lower air return opening can be controlled to be opened or closed; both the upper air duct and the outlet of the upper air blade cavity and the lower air duct and the outlet of the lower air blade cavity can be controlled to be connected or disconnected.

[0008] Further optionally, an upper wind shielding structure is movably arranged at the upper air return opening. The upper wind shielding structure can open the upper air return opening while disconnecting the upper air duct and the outlet of the upper air blade cavity, or close the upper air return opening while connecting the upper air duct and the outlet of the upper air blade cavity.

[0009] A lower wind shielding structure is movably arranged at the lower air return opening. The lower wind shielding structure can open the lower air return opening while disconnecting the lower air duct and the outlet of the lower air blade cavity, or close the lower air return opening while connecting the lower air duct and the outlet of the lower air blade cavity.

[0010] Further optionally, an upper air blade is rotatably arranged in the upper air blade cavity, and a lower air blade is rotatably arranged in the lower air blade cavity; 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.

[0011] When the cabinet-type air conditioner indoor unit is in the upper air outlet mode, when the upper wind shielding structure closes the upper air return opening while connecting the upper air duct and the outlet of the upper air blade cavity, and the lower wind shielding structure opens the lower air return opening while disconnecting the lower air duct and the outlet of the lower air blade cavity, the upper air blade rotates. The air near the lower air outlet in the room can enter the lower air duct through the lower air outlet, and then enter the housing cavity through the lower air return opening; the air near the lower air inlet in the room can enter the housing cavity through the lower air inlet, and the air near the upper air inlet in the room can enter the housing cavity through the upper air inlet; the air in the housing cavity enters the upper air blade cavity through the upper air blade cavity inlet, and then is discharged through the upper air duct and the upper air outlet.

[0012] When the cabinet-type air conditioner indoor unit is in the lower air outlet mode, when the upper wind shielding structure opens the upper air return opening while disconnecting the upper air duct and the outlet of the upper air blade cavity, and the lower wind shielding structure closes the lower air return opening while connecting the lower air duct and the outlet of the lower air blade cavity, the lower air blade rotates. The air near the upper air outlet in the room can enter the upper air duct through the upper air outlet, and then enter the housing cavity through the upper air return opening; the air near the upper air inlet in the room can enter the housing cavity through the upper air inlet, and the air near the lower air inlet in the room can enter the housing cavity through the lower air inlet; the air in the housing cavity enters the lower air blade cavity through the lower air blade cavity inlet, and then is discharged through the lower air duct and the lower air outlet.

[0013] When the floor-standing air conditioner indoor unit is in the upper and lower simultaneous air outlet mode, when the upper wind deflector structure closes the upper air return opening and connects the upper air duct and the upper air blade cavity outlet, and the lower wind deflector structure closes the lower air return opening and connects the lower air duct and the lower air blade cavity outlet, both the upper air blade and the lower air blade rotate. The air near the upper air inlet indoors can enter the housing cavity through the upper air inlet, enter the upper air blade cavity through the upper air blade cavity inlet, and then be discharged through the upper air duct and the upper air outlet; the air near the lower air inlet indoors can enter the housing cavity through the lower air inlet, enter the lower air blade cavity through the lower air blade cavity inlet, and then be discharged through the lower air duct and the lower air outlet.

[0014] Further optionally, the housing includes a left side wall of the housing; a left inlet of the upper air blade cavity is formed on the axial left side of the upper air blade cavity, and a left inlet of the lower air blade cavity is formed on the axial left side of the lower air blade cavity; the floor-standing air conditioner indoor unit further includes an indoor heat exchanger, and the indoor heat exchanger includes a left heat exchanger disposed in the housing cavity. The left heat exchanger includes an A1 heat exchange section and a B1 heat exchange section disposed opposite to each other up and down; the A1 heat exchange section is disposed between the left side wall of the housing and the left inlet of the upper air blade cavity; the B1 heat exchange section is disposed between the left side wall of the housing and the left inlet of the lower air blade cavity; and / or,

[0015] The housing includes a right side wall of the housing; a right inlet of the upper air blade cavity is formed on the axial right side of the upper air blade cavity, and a right inlet of the lower air blade cavity is formed on the axial right side of the lower air blade cavity; the floor-standing air conditioner indoor unit further includes an indoor heat exchanger, and the indoor heat exchanger includes a right heat exchanger disposed in the housing cavity. The right heat exchanger includes an A2 heat exchange section and a B2 heat exchange section disposed opposite to each other up and down; the A2 heat exchange section is disposed between the right side wall of the housing and the right inlet of the upper air blade cavity; the B2 heat exchange section is disposed between the right side wall of the housing and the right inlet of the lower air blade cavity.

[0016] Further optionally, an upper air inlet blade is rotatably disposed at the upper air inlet, and a lower air inlet blade is rotatably disposed at the lower air inlet; the rotation speeds of both the upper air inlet blade and the lower air inlet blade can be adjusted according to the temperature difference between the indoor air temperature and the preset temperature.

[0017] Further optionally, the upper air duct includes an upper main air duct and an upper auxiliary air duct. The upper auxiliary air duct is disposed at the top of the upper main air duct and communicates with the upper main air duct and the upper air outlet. The upper main air duct includes an upper main air duct front side wall and an upper main air duct rear side wall that are oppositely disposed front and rear. The upper main air duct rear side wall corresponds to the housing rear side wall and forms an upper air return opening. The upper air duct rear side wall rotatably disposes the upper air blocking structure. When the upper air blocking structure rotates toward the upper main air duct rear side wall, the upper air return opening can be closed. When the upper air blocking structure rotates toward the upper main air duct front side wall, the upper main air duct and the upper air blade cavity outlet are disconnected.

[0018] The lower air duct includes a lower main air duct and a lower auxiliary air duct. The lower auxiliary air duct is disposed at the bottom of the lower main air duct and communicates with the lower main air duct and the lower air outlet. The lower main air duct includes a lower main air duct front side wall and a lower main air duct rear side wall that are oppositely disposed front and rear. The lower main air duct rear side wall corresponds to the housing rear side wall and forms a lower air return opening. The lower main air duct rear side wall rotatably disposes the lower air blocking structure. When the lower air blocking structure rotates toward the lower main air duct rear side wall, the lower air return opening can be closed. When the lower air blocking structure rotates toward the lower main air duct front side wall, the lower main air duct and the lower air blade cavity outlet can be disconnected.

[0019] Further optionally, the air duct assembly includes a volute and a volute cover. The volute and the volute cover are cooperatively connected to form the upper main air duct, the upper air blade cavity, the lower air blade cavity, and the lower main air duct.

[0020] The air duct assembly further includes an upper ventilation shell and a lower ventilation shell. Both the upper ventilation shell and the lower ventilation shell are disposed in the housing cavity. The upper ventilation shell is disposed at the top of the upper main air duct and forms an upper auxiliary air duct. The lower ventilation shell is disposed at the bottom of the lower main air duct and forms a lower auxiliary air duct.

[0021] The present invention further provides a control method for a cabinet-type air conditioner indoor unit. 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:

[0022] Determine the target operation mode of the cabinet-type air conditioner indoor unit;

[0023] Determine the target air return opening and the target air blade according to the target operation mode;

[0024] Control the opening of the target air return opening and the operation of the target air blade;

[0025] Adjust the rotation speeds of the upper air inlet blades and the lower air inlet blades according to the target operation mode and the current temperature of the indoor air;

[0026] Among them, the target operation mode is the upper air outlet mode, or the lower air outlet mode, or the upper and lower air outlet modes at the same time; the target air return opening is the upper air return opening or the lower air return opening, and the target air blade is the upper air blade or the lower air blade.

[0027] Further optionally, determining the target air return opening and the target air blade according to the target operation mode includes:

[0028] When the target operation mode is the upper air outlet mode, the target air return opening is the lower air return opening, and the target air blade is the upper air blade;

[0029] When the target operation mode is the lower air outlet mode, the target air return opening is the upper air return opening, and the target air blade is the lower air blade.

[0030] Further optionally, adjusting the rotation speeds of the upper air inlet blade and the lower air inlet blade according to the target operation mode and the current temperature of the indoor air includes:

[0031] Comparing the current temperature with the preset temperature;

[0032] When the current temperature is less than the preset temperature and the target operation mode is the upper air outlet mode, adjust the rotation speeds of the upper air inlet blade and the lower air inlet blade to the first preset rotation speed;

[0033] When the current temperature is greater than or equal to the preset temperature and the target operation mode is the upper air outlet mode, adjust the rotation speeds of the upper air inlet blade and the lower air inlet blade to the second preset rotation speed;

[0034] When the current temperature is less than the preset temperature and the target operation mode is the lower air outlet mode, adjust the rotation speeds of the upper air inlet blade and the lower air inlet blade to the third preset rotation speed;

[0035] When the current temperature is greater than or equal to the preset temperature and the target operation mode is the lower air outlet mode, adjust the rotation speeds of the upper air inlet blade and the lower air inlet blade to the fourth preset rotation speed;

[0036] When the target operation mode is the upper and lower air outlet modes at the same time, adjust the rotation speeds of the upper air inlet blade and the lower air inlet blade to the fifth preset rotation speed;

[0037] Among them, the first preset rotation speed is less than the second preset rotation speed; the third preset rotation speed is less than the fourth preset rotation speed.

[0038] Compared with the prior art, the beneficial effects of the present invention mainly lie in:

[0039] The positions of the upper air inlet and the lower air inlet are optimized, and the distance between the upper air inlet and the lower air inlet is increased. By making full use of the principle that cold air sinks during refrigeration 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 inlets and the lower air inlets are added, the air intake volume is increased, the temperature change speed of the indoor air is improved, 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 comfort of the air is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] 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.

[0041] The structures, ratios, sizes, etc. shown in this specification are only used to cooperate with the content disclosed in the specification for those who are 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 technical essence. Any modification of the structure, change of 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.

[0042] 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;

[0043] 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;

[0044] Figure 3 It is a schematic internal structure diagram of an embodiment of a cabinet - type air - conditioner indoor unit provided by the present invention;

[0045] Figure 4a and Figure 4b It is a schematic assembly structure diagram of an embodiment of an air duct assembly (without upper and lower auxiliary air ducts) provided by the present invention;

[0046] Figure 5 It is a schematic assembly structure diagram of an embodiment of an air duct assembly (without upper and lower auxiliary air ducts) and an indoor heat exchanger provided by the present invention;

[0047] Figure 6a It is a schematic structure diagram of an embodiment when the cabinet - type air - conditioner indoor unit is in the upper - air - outlet mode provided by the present invention;

[0048] Figure 6bSchematic structural diagram of an embodiment when the floor-standing air conditioner indoor unit provided by the present invention is in the downward air outlet mode;

[0049] Figure 6c Schematic structural diagram of an embodiment when the floor-standing air conditioner indoor unit provided by the present invention is in the simultaneous upper and lower air outlet mode;

[0050] Figure 7a Schematic structural diagram of an embodiment of the mounting frame provided by the present invention;

[0051] Figure 7b Schematic structural diagram of an embodiment of the partition provided by the present invention;

[0052] In the figure:

[0053] 1 - Housing; 11 - Front side wall of the housing; 111 - Lower air outlet; 12 - Left side wall of the housing; 13 - Right side wall of the housing; 14 - Rear side wall of the housing; 141 - Lower air inlet; 15 - Top wall of the housing; 151 - Upper air outlet; 152 - Upper air inlet; 16 - Housing cavity; 17 - Base; 18 - Mounting frame;

[0054] 2 - Air duct assembly; 21 - Volute; 22 - Volute cover; 23 - Upper air blade cavity; 231 - Inlet of the upper air blade cavity; 232 - Outlet of the upper air blade cavity; 233 - Upper air blade; 24 - Lower air blade cavity; 241 - Inlet of the lower air blade cavity; 242 - Outlet of the lower air blade cavity; 243 - Lower air blade; 25 - Upper main air duct; 251 - Rear side wall of the upper main air duct; 252 - Front side wall of the upper main air duct; 253 - Upper return air opening; 26 - Lower main air duct; 261 - Rear side wall of the lower main air duct; 262 - Front side wall of the lower main air duct; 263 - Lower return air opening; 27 - Upper ventilation shell; 271 - Upper auxiliary air duct; 28 - Lower ventilation shell; 281 - Lower auxiliary air duct;

[0055] 31 - Upper wind blocking structure; 32 - Lower wind blocking structure; 33 - Upper inlet air blade; 34 - Lower inlet air blade; 35 - Partition; 351 - Rib;

[0056] 41 - A1 heat exchange section; 42 - B1 heat exchange section; 43 - A2 heat exchange section; 44 - B2 heat exchange section. Specific embodiments

[0057] 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 them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0058] 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 dictates otherwise. "Plural" generally includes at least two, but does not exclude the case of including at least one.

[0059] It should be understood that the term "and / or" used herein is merely 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 associated objects before and after.

[0060] It should also be noted that the terms "comprise", "include" or any other variant 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 expressly listed, or elements inherent to such commodity or system. Without further limitation, an element defined by the statement "comprising one..." does not exclude the existence of another identical element in the commodity or system including the said element.

[0061] In the prior art, the housing is formed with an upper air outlet, a lower air outlet and an air inlet; 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 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, and increases the time required to reduce the vertical temperature difference in the room where the indoor unit is located.

[0062] The present invention creatively provides a cabinet-type air conditioner indoor unit, including a housing and an air duct assembly; the housing encloses a housing cavity, and the upper part of the housing is formed with an upper air opening and an upper air inlet, and the lower part of the housing is formed with a lower air opening and a lower air inlet; the upper air opening, the upper air inlet, the lower air opening and the lower air inlet are all communicated with the room, and the upper air inlet and the lower air inlet are both communicated with the housing cavity;

[0063] The air duct assembly is arranged in the housing cavity and is formed with an upper air duct, an upper air blade cavity, a lower air blade cavity and a lower air duct which are arranged in sequence from top to bottom. The upper air blade cavity includes an upper air blade cavity inlet and an upper air blade cavity outlet; the upper air opening, the upper air duct and the upper air blade cavity outlet are communicated in sequence, and an upper air return opening is formed on the side wall of the upper air duct; the lower air blade cavity includes a lower air blade cavity inlet and a lower air blade cavity outlet; the lower air blade cavity outlet, the lower air duct and the lower air opening are communicated in sequence, and a lower air return opening is formed on the side wall of the lower main air duct;

[0064] The upper air return opening communicates with the upper air duct and the housing cavity, and the lower air return opening communicates with the lower air duct and the housing cavity; the upper air vane cavity inlet communicates with the upper air vane cavity and the housing cavity, and the lower air vane cavity inlet communicates with the lower air vane cavity and the housing cavity;

[0065] Both the upper air return opening and the lower air return opening can be controlled to be opened or closed, and both the upper air duct and the upper air vane cavity outlet and the lower air duct and the lower air vane cavity outlet can be controlled to be connected or disconnected, so that the cabinet-type air conditioner indoor unit can realize upper air outlet, lower air outlet and upper and lower simultaneous air outlet;

[0066] The positions of the upper air outlet and the lower air outlet are optimized, the distance between the upper air outlet and the lower air outlet is increased, the principle that cold air sinks during refrigeration and hot air rises during heating is fully utilized, the airflow range is expanded, and 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, the air intake 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, the airflow short circuit is avoided, and the air comfort is improved.

[0067] <Cabinet-type air conditioner indoor unit>

[0068] As Figures 1 to 7b As shown, this embodiment provides a cabinet-type air conditioner indoor unit, which includes a housing 1 and an air duct assembly 2; the housing 1 encloses a housing cavity 16, and an upper air outlet 151 and an upper air inlet 152 are formed at the upper part of the housing 1, and a lower air outlet 111 and a lower air inlet 141 are formed at the lower part of the housing 1; the upper air outlet 151, the upper air inlet 152, the lower air outlet 111 and the lower air inlet 141 are all communicated with the room, and the upper air inlet 152 and the lower air inlet 141 are both communicated with the housing cavity 16; specifically, the housing 1 includes a housing top wall 15, a housing front side wall 11, a housing rear side wall 14, a housing left side wall 12, a housing right side wall 13 and a base 17, the housing front side wall 11 and the housing rear side wall 14 are arranged opposite to each other front and back, the housing left side wall 12 and the housing right side wall 13 are arranged opposite to each other left and right, the housing front side wall 11, the housing left side wall 12, the housing rear side wall 14 and the housing right side wall 13 are connected in sequence and are all arranged on the base 17, and the housing top wall 15 is connected to the tops of the housing front side wall 11, the housing left side wall 12, the housing rear side wall 14 and the housing right side wall 13; the housing front side wall 11, the housing left side wall 12, the housing rear side wall 14, the housing right side wall 13, the housing top wall 15 and the base 17 enclose the housing cavity 16; the front side of the housing top wall 15 forms the upper air outlet 151, and the lower side of the housing front side wall 11 forms the lower air outlet 111; the rear side of the housing top wall 15 forms the upper air inlet 152, and the lower side of the housing rear side wall 14 forms the lower air inlet 141; the lower air outlet 111 and the lower air inlet 141 are arranged close to the base 17;

[0069] The air duct assembly 2 is disposed within the housing cavity 16, and the air duct assembly 2 is formed with an upper air duct, an upper air blade cavity 23, a lower air blade cavity 24, and a lower air duct that are sequentially arranged from top to bottom. The upper air blade cavity 23 includes an upper air blade cavity inlet 231 and an upper air blade cavity outlet 232; the upper air duct communicates with the upper air inlet 151 and the upper air blade cavity outlet 232, and an upper air return opening 253 is formed on the side wall of the upper air duct; the lower air blade cavity 24 includes a lower air blade cavity inlet 241 and a lower air blade cavity outlet 242; the lower air duct communicates with the lower air inlet 111 and the lower air blade cavity outlet 242, and a lower air return opening 263 is formed on the side wall of the lower air duct; specifically, an upper air blade cavity outlet 232 is formed on one radial side of the upper air blade cavity 23, and an upper air blade cavity inlet 231 is formed on each of the two axial sides of the upper air blade cavity 23; a lower air blade cavity outlet 242 is formed on one radial side of the lower air blade cavity 24, and a lower air blade cavity inlet 241 is formed on each of the two axial sides of the lower air blade cavity 24;

[0070] The upper air return opening 253 communicates the upper air duct and the housing cavity 16, and the lower air return opening 263 communicates the lower air duct and the housing cavity 16; the upper air blade cavity inlet 231 communicates the upper air blade cavity 23 and the housing cavity 16, and the lower air blade cavity inlet 241 communicates the lower air blade cavity 24 and the housing cavity 16;

[0071] Indoor air can enter the housing cavity 16 through the upper air inlet 152 and the lower air inlet 141 respectively. The air within the housing cavity 16 can enter the upper air blade cavity 23 through the upper air blade cavity inlet 231, or enter the lower air blade cavity 24 through the lower air blade cavity inlet 241;

[0072] An upper air dam structure 31 is movably disposed at the upper air return opening 253. The upper air dam structure 31 can open the upper air return opening 253 while disconnecting the upper air duct and the upper air blade cavity outlet 232, or close the upper air return opening 253 while connecting the upper air duct and the upper air blade cavity outlet 232; a lower air dam structure 32 is movably disposed at the lower air return opening 263. The lower air dam structure 32 can open the lower air return opening 263 while disconnecting the lower air duct and the lower air blade cavity outlet 242, or close the lower air return opening 263 while connecting the lower air duct and the lower air blade cavity outlet 242;

[0073] Specifically, an upper air blade 233 is rotatably disposed within the upper air blade cavity 23, and a lower air blade 243 is rotatably disposed within the lower air blade cavity 24; 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; the upper air dam structure 31 is an upper baffle, and the lower air dam structure 32 is a lower baffle;

[0074] When the cabinet-type air conditioner indoor unit is in the upper air outlet mode, when the upper wind deflector structure 31 closes the upper air return opening 253 and at the same time connects the upper air duct and the upper air blade cavity outlet 232, and the lower wind deflector structure 32 opens the lower air return opening 263 and at the same time disconnects the lower air duct and the lower air blade cavity outlet 242; when the upper air blade 233 rotates and the lower air blade 243 does not rotate, the air near the lower air outlet 111 indoors can enter the lower air duct through the lower air outlet 111, and then enter the housing cavity 16 through the lower air return opening 263; the air near the lower air inlet 141 indoors can enter the housing cavity 16 through the lower air inlet 141, and the air near the upper air inlet 152 indoors can enter the housing cavity 16 through the upper air inlet 152; the air in the housing cavity 16 enters the upper air blade cavity 23 through the upper air blade cavity inlet 231, and then is discharged through the upper air duct and the upper air outlet 151; at this time, the cabinet-type air conditioner indoor unit can operate in the cooling mode;

[0075] When the cabinet-type air conditioner indoor unit is in the lower air outlet mode, when the upper wind deflector structure 31 opens the upper air return opening 253 and at the same time disconnects the upper air duct and the upper air blade cavity outlet 232, and the lower wind deflector structure 32 closes the lower air return opening 263 and at the same time connects the lower air duct and the lower air blade cavity outlet 242; when the lower air blade 243 rotates and the upper air blade 233 does not rotate, the air near the upper air outlet 151 indoors can enter the upper air duct through the upper air outlet 151, and then enter the housing cavity 16 through the upper air return opening 253; the air near the upper air inlet 152 indoors can enter the housing cavity 16 through the upper air inlet 152, and the air near the lower air inlet 141 indoors can enter the housing cavity 16 through the lower air inlet 141; the air in the housing cavity 16 enters the lower air blade cavity 24 through the lower air blade cavity inlet 241, and then is discharged through the lower air duct and the lower air outlet 111; at this time, the cabinet-type air conditioner indoor unit can operate in the heating mode;

[0076] When the cabinet-type air conditioner indoor unit is in the upper and lower simultaneous air outlet mode, when the upper wind deflector structure 31 closes the upper air return opening 253 and at the same time connects the upper air duct and the upper air blade cavity outlet 232, and the lower wind deflector structure 32 closes the lower air return opening 263 and at the same time connects the lower air duct and the lower air blade cavity outlet 242; when both the upper air blade 233 and the lower air blade 243 rotate, the air near the upper air inlet 152 indoors can enter the housing cavity 16 through the upper air inlet 152, and this part of the air enters the upper air blade cavity 23 through the upper air blade cavity inlet 231, and then is discharged through the upper air duct and the upper air outlet 151; the air near the lower air inlet 141 indoors can enter the housing cavity 16 through the lower air inlet 141, and this part of the air enters the lower air blade cavity 24 through the lower air blade cavity inlet 241, and then is discharged through the lower air duct and the lower air outlet 111.

[0077] Regarding the problem that the unreasonable positions of the upper air return opening 253 and the lower air return opening 263 result in large resistance when air flows through the upper air return opening 253 and the lower air return opening 263, in this embodiment, it is proposed that the upper air duct includes an upper main air duct 25 and an upper auxiliary air duct 271. The upper auxiliary air duct 271 is arranged on the top of the upper main air duct 25 and communicates with the upper main air duct 25 and the upper air outlet 151. The upper main air duct 25 includes an upper main air duct front side wall 252 and an upper main air duct rear side wall 251 which are arranged opposite to each other front and back. The upper main air duct rear side wall 251 corresponds to the housing rear side wall 14 and forms an upper air return opening 253. An upper wind blocking structure 31 is rotatably arranged on the upper main air duct rear side wall 251. When the upper wind blocking structure 31 rotates towards the upper main air duct rear side wall 251, it can close the upper air return opening 253. When the upper wind blocking structure 31 rotates towards the upper main air duct front side wall 252, it can disconnect the upper main air duct 25 and the upper air blade cavity outlet 232.

[0078] The lower air duct includes a lower main air duct 26 and a lower auxiliary air duct 281. The lower auxiliary air duct 281 is arranged at the bottom of the lower main air duct 26 and communicates with the lower main air duct 26 and the lower air outlet 111. The lower main air duct 26 includes a lower main air duct front side wall 262 and a lower main air duct rear side wall 261 which are arranged opposite to each other front and back. The lower main air duct rear side wall 261 corresponds to the housing rear side wall 14 and forms a lower air return opening 263. A lower wind blocking structure 32 is rotatably arranged on the lower main air duct rear side wall 261. When the lower wind blocking structure 32 rotates towards the lower main air duct rear side wall 261, it can close the lower air return opening 263. When the lower wind blocking structure 32 rotates towards the lower main air duct front side wall 262, it can disconnect the lower main air duct 26 and the lower air blade cavity outlet 242.

[0079] Regarding the problem that when the cabinet-type air conditioner indoor unit is in the upper air outlet mode, the air inlet at the upper air inlet 152 and the air outlet at the upper air outlet 151 are prone to form an air flow short circuit, in this embodiment, it is proposed that a partition 35 is arranged between the upper air inlet 152 and the upper air outlet 151. The partition 35 includes a first diversion surface and a second diversion surface which are arranged opposite to each other. The first diversion surface is arranged close to the upper air inlet 152. The indoor air can enter the housing cavity 16 through the first diversion surface and the upper air inlet 152. The first diversion surface plays a role in guiding the air flow, enabling the indoor air to smoothly enter the housing cavity 16 through the upper air inlet 152.

[0080] The second diversion surface is arranged close to the upper air outlet 151. After the air in the upper main air duct 25 is discharged through the upper air outlet 151, it is then discharged to the indoor through the second diversion surface, realizing air outlet in different directions, expanding the air outlet range, and improving the air outlet effect.

[0081] Specifically, an installation frame 18 is formed at the top of the housing 1, and the installation frame 18 forms an installation groove. A rib 351 is formed at the edge of the partition 35, and the rib 351 is embedded in the installation groove, so that the partition 35 is installed on the installation frame 18.

[0082] In view of the problem that the unreasonable design of the structure and position of the indoor heat exchanger leads to poor heat exchange effect between the air entering the housing cavity 16 and the indoor heat exchanger, in this embodiment, the upper airfoil cavity inlet 231 includes a left upper airfoil cavity inlet and a right upper airfoil cavity inlet; a left upper airfoil cavity inlet is formed on the axial left side of the upper airfoil cavity 23, and a right upper airfoil cavity inlet is formed on the axial right side of the upper airfoil cavity 23; the lower airfoil cavity inlet 241 includes a left lower airfoil cavity inlet and a right lower airfoil cavity inlet; a left lower airfoil cavity inlet is formed on the axial left side of the lower airfoil cavity 24, and a right lower airfoil cavity inlet is formed on the axial right side of the lower airfoil cavity 24;

[0083] The cabinet-type air conditioner indoor unit further includes an indoor heat exchanger, and the indoor heat exchanger includes a left heat exchanger and a right heat exchanger both arranged in the housing cavity 16. The left heat exchanger protrudes towards the left side wall 12 of the housing and includes an A1 heat exchange section 41 and a B1 heat exchange section 42 which are arranged opposite to each other up and down; the A1 heat exchange section 41 is arranged between the left side wall 12 of the housing and the left upper airfoil cavity inlet; the B1 heat exchange section 42 is arranged between the left side wall 12 of the housing and the left lower airfoil cavity inlet;

[0084] The right heat exchanger protrudes towards the right side wall 13 of the housing and includes an A2 heat exchange section 43 and a B2 heat exchange section 44 which are arranged opposite to each other up and down; the A2 heat exchange section 43 is arranged between the right side wall 13 of the housing and the right upper airfoil cavity inlet; the B2 heat exchange section 44 is arranged between the right side wall 13 of the housing and the right lower airfoil cavity inlet;

[0085] When the cabinet-type air conditioner indoor unit is in the upper air outlet mode, the upper airfoil 233 rotates and the lower airfoil 243 does not rotate; the indoor air entering the housing cavity 16 through the upper air inlet 152 enters the upper airfoil cavity 23 through the A1 heat exchange section 41 and the left upper airfoil cavity inlet, or enters the upper airfoil cavity 23 through the A2 heat exchange section 43 and the right upper airfoil cavity inlet; the air entering the housing cavity 16 through the lower air outlet 111, the lower main air duct 26 and the lower air return opening 263 and the air entering the housing cavity 16 through the lower air inlet 141 enter the upper airfoil cavity 23 through the B1 heat exchange section 42 and the left upper airfoil cavity inlet, or enter the upper airfoil cavity 23 through the B2 heat exchange section 44 and the right upper airfoil cavity inlet;

[0086] When the cabinet-type air conditioner indoor unit is in the lower air outlet mode, the upper airfoil 233 does not rotate and the lower airfoil 243 rotates; the indoor air entering the housing cavity 16 through the lower air inlet 141 enters the lower airfoil cavity 24 through the B1 heat exchange section 42 and the left lower airfoil cavity inlet, or enters the lower airfoil cavity 24 through the B2 heat exchange section 44 and the right lower airfoil cavity inlet; the air entering the housing cavity 16 through the upper air outlet 151, the upper main air duct 25 and the upper air return opening 253 and the air entering the housing cavity 16 through the upper air inlet 152 enter the lower airfoil cavity 24 through the A1 heat exchange section 41 and the left lower airfoil cavity inlet, or enter the lower airfoil cavity 24 through the A2 heat exchange section 43 and the right lower airfoil cavity inlet;

[0087] When the floor-standing air conditioner indoor unit is in the up-and-down simultaneous air outlet mode, both the upper air blade 233 and the lower air blade 243 rotate; the indoor air entering the housing cavity 16 through the upper air inlet 141 enters the upper air blade cavity 23 through the A1 heat exchange section 41 and the left inlet of the upper air blade cavity, or enters the upper air blade cavity 23 through the A2 heat exchange section 43 and the right inlet of the upper air blade cavity; the indoor air entering the housing cavity 16 through the lower air inlet 141 enters the lower air blade cavity 24 through the B1 heat exchange section 42 and the left inlet of the lower air blade cavity, or enters the lower air blade cavity 24 through the B2 heat exchange section 44 and the right inlet of the lower air blade cavity.

[0088] Further, the A1 heat exchange section 41 extends upward to the main air duct 25, the B1 heat exchange section 42 extends downward to the main air duct 26, and it satisfies: 90°≤ɑ≤180°; the A2 heat exchange section 43 extends upward to the main air duct 25, the B2 heat exchange section 44 extends downward to the main air duct 26, and it satisfies: 90°≤β≤180°;

[0089] Wherein, ɑ is the included angle between the heat exchange surface of the A1 heat exchange section 41 and the heat exchange surface of the B1 heat exchange section 42, and both the A1 heat exchange section 41 and the B1 heat exchange section 42 are plate structures; β is the included angle between the heat exchange surface of the A2 heat exchange section 43 and the heat exchange surface of the B2 heat exchange section 44, and both the A2 heat exchange section 43 and the B2 heat exchange section 44 are plate structures;

[0090] Make full use of the space between the air duct assembly 2 and the housing 1, optimize the structures of the left heat exchanger and the right heat exchanger, increase the heat exchange areas of the left heat exchanger and the right heat exchanger, enable the air in the housing cavity 16 to complete sufficient heat exchange with the left heat exchanger and the right heat exchanger, quickly reach the set temperature in the room where the indoor unit is located, and improve the comfort of the air outlet of the floor-standing air conditioner indoor unit.

[0091] Aiming at the problem of insufficient air intake during the operation of the floor-standing air conditioner, this embodiment proposes that an upper air inlet blade 33 is rotatably arranged at the upper air inlet 152, and a lower air inlet blade 34 is rotatably arranged at the lower air inlet 141; the rotation speeds of the upper air inlet blade 33 and the lower air inlet blade 34 can both be adjusted according to the temperature difference between the indoor air temperature and the preset temperature; preferably, both the upper air inlet blade 33 and the lower air inlet blade 34 are arranged in the housing cavity 16 and are both axial flow blades.

[0092] Aiming at the problem of unsmooth air intake and air outlet caused by the unreasonable structural design of the air duct assembly 2, this embodiment proposes that the air duct assembly 2 includes a volute 21 and a volute cover 22, and the volute 21 and the volute cover 22 are cooperatively connected to form an upper main air duct 25, an upper air blade cavity 23, a lower air blade cavity 24 and a lower main air duct 26; both the upper air blade 233 and the lower air blade 243 are centrifugal air blades.

[0093] Further, the air duct assembly 2 further includes an upper ventilation housing 27 and a lower ventilation housing 28, both of which are disposed in the housing cavity 16; the upper ventilation housing 27 is disposed at the top of the upper main air duct 25 and forms an upper sub-air duct 271; the lower ventilation housing 28 is disposed at the bottom of the lower main air duct 26 and forms a lower sub-air duct 281.

[0094] <Control method>

[0095] This embodiment 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, and the control method includes:

[0096] S1. Determine the target operation mode of the cabinet-type air conditioner indoor unit;

[0097] S2. Determine the target air return opening and the target air blade according to the target operation mode;

[0098] S3. Control the opening of the target air return opening and the operation of the target air blade;

[0099] S4. Adjust the rotation speeds of the upper air inlet blade 33 and the lower air inlet blade 34 according to the target operation mode and the current temperature of the indoor air;

[0100] Among them, the target operation mode is the upper air outlet mode or the lower air outlet mode or the upper and lower simultaneous air outlet mode; the target air return opening is the upper air return opening 253 or the lower air return opening 263, and the target air blade is the upper air blade 233 or the lower air blade 243.

[0101] Further, S2 includes:

[0102] When the target operation mode is the upper air outlet mode, the target air return opening is the lower air return opening 263, and the target air blade is the upper air blade 233; at this time, the cabinet-type air conditioner can operate in the cooling mode;

[0103] When the target operation mode is the lower air outlet mode, the target air return opening is the upper air return opening 253, and the target air blade is the lower air blade 243; at this time, the cabinet-type air conditioner can operate in the heating mode.

[0104] S4 includes:

[0105] Compare the current temperature with the preset temperature;

[0106] When the current temperature is less than the preset temperature and the target operation mode is the upper air outlet mode, adjust the rotation speeds of both the upper air inlet blade 33 and the lower air inlet blade 34 to the first preset rotation speed;

[0107] When the current temperature is greater than or equal to the preset temperature and the target operation mode is the upper air outlet mode, adjust the rotation speeds of both the upper air inlet blade 33 and the lower air inlet blade 34 to the second preset rotation speed;

[0108] When the current temperature is lower than the preset temperature and the target operation mode is the downward air outlet mode, adjust the rotation speeds of the upper air inlet vane 33 and the lower air inlet vane 34 to the third preset rotation speed;

[0109] When the current temperature is greater than or equal to the preset temperature and the target operation mode is the downward air outlet mode, adjust the rotation speeds of the upper air inlet vane 33 and the lower air inlet vane 34 to the fourth preset rotation speed;

[0110] According to the current temperature of the indoor air, adjust the rotation speeds of the upper air inlet vane 33 and the lower air inlet vane 34 in real time to offset the problem of large air volume loss caused by the upper air inlet vane 33 blocking the upper air inlet 152 and the lower air inlet vane 34 blocking the lower air inlet 141.

[0111] S4 further includes:

[0112] When the target operation mode is the upper and lower simultaneous air outlet mode, adjust the rotation speeds of the upper air inlet vane 33 and the lower air inlet vane 34 to the fifth preset rotation speed;

[0113] Among them, the first preset rotation speed is less than the second preset rotation speed; the third preset rotation speed is less than the fourth preset rotation speed.

[0114] The above specifically shows and describes the exemplary embodiments of the present disclosure. It should be understood that the present disclosure is not limited to the detailed structures, setting methods or implementation methods described here; on the contrary, the present disclosure is intended to cover various modifications and equivalent settings included in 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; the housing encloses a housing cavity, and an upper air inlet and an upper inlet air opening are formed in the upper part of the housing, and a lower air outlet and a lower inlet air opening are formed in the lower part of the housing; the upper air inlet, the upper inlet air opening, the lower air outlet and the lower inlet air opening are all in communication with the room, and both the upper inlet air opening and the lower inlet air opening are in communication with the housing cavity; The air duct assembly is arranged in the housing cavity, and the air duct assembly forms an upper air duct, an upper air blade cavity, a lower air blade cavity and a lower air duct which are arranged in sequence from top to bottom. The upper air blade cavity includes an upper air blade cavity inlet and an upper air blade cavity outlet; the upper air duct communicates the upper air inlet and the upper air blade cavity outlet, and an upper air return opening is formed in the side wall of the upper air duct; the lower air blade cavity includes a lower air blade cavity inlet and a lower air blade cavity outlet; The lower air duct communicates the lower air outlet and the lower air blade cavity outlet, and a lower air return opening is formed in the side wall of the lower air duct; The upper air return opening communicates the upper air duct and the housing cavity, and the lower air return opening communicates the lower air duct and the housing cavity; The upper air blade cavity inlet communicates the upper air blade cavity and the housing cavity, and the lower air blade cavity inlet communicates the lower air blade cavity and the housing cavity; Both the upper air return opening and the lower air return opening can be controlled to be opened or closed; both the upper air duct and the upper air blade cavity outlet and the lower air duct and the lower air blade cavity outlet can be controlled to be communicated or disconnected.

2. The indoor unit of a cabinet air conditioner according to claim 1, characterized in that, An upper wind shielding structure is movably arranged at the upper air return opening. The upper wind shielding structure can open the upper air return opening while disconnecting the upper air duct and the upper air blade cavity outlet, or close the upper air return opening while communicating the upper air duct and the upper air blade cavity outlet; A lower wind shielding structure is movably arranged at the lower air return opening. The lower wind shielding structure can open the lower air return opening while disconnecting the lower air duct and the lower air blade cavity outlet, or close the lower air return opening while communicating the lower air duct and the lower air blade cavity outlet.

3. The cabinet-type air conditioner indoor unit according to claim 2, characterized in that, An upper air blade is rotatably arranged in the upper air blade cavity, and a lower air blade is rotatably arranged in the lower air blade cavity; 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, when the upper wind shielding structure closes the upper air return opening while communicating the upper air duct and the upper air blade cavity outlet, and the lower wind shielding structure opens the lower air return opening while disconnecting the lower air duct and the lower air blade cavity outlet, the upper air blade rotates, and the air near the lower air outlet in the room can enter the lower air duct through the lower air outlet, and then enter the housing cavity through the lower air return opening; The air near the lower inlet air opening in the room can enter the housing cavity through the lower inlet air opening, and the air near the upper inlet air opening in the room can enter the housing cavity through the upper inlet air opening; the air in the housing cavity enters the upper air blade cavity through the upper air blade cavity inlet, and then is discharged through the upper air duct and the upper air inlet. When the floor-standing air conditioner indoor unit is in the downward air outlet mode, when the upper air baffle structure opens the upper air return opening and disconnects the upper air duct and the upper air blade cavity outlet, and the lower air baffle structure closes the lower air return opening and connects the lower air duct and the lower air blade cavity outlet at the same time, the lower air blade rotates, and the air near the upper air outlet in the room can enter the upper air duct through the upper air outlet, and then enter the housing cavity through the upper air return opening; The air near the upper air inlet in the room can enter the housing cavity through the upper air inlet, and the air near the lower air inlet in the room can enter the housing cavity through the lower air inlet; the air in the housing cavity enters the lower air blade cavity through the lower air blade cavity inlet, and then is discharged through the lower air duct and the lower air outlet; When the floor-standing air conditioner indoor unit is in the upper and lower simultaneous air outlet mode, when the upper air baffle structure closes the upper air return opening and connects the upper air duct and the upper air blade cavity outlet at the same time, and the lower air baffle structure closes the lower air return opening and connects the lower air duct and the lower air blade cavity outlet at the same time, both the upper air blade and the lower air blade rotate, and the air near the upper air inlet in the room can enter the housing cavity through the upper air inlet, enter the upper air blade cavity through the upper air blade cavity inlet, and then be discharged through the upper air duct and the upper air outlet; The air near the lower air inlet in the room can enter the housing cavity through the lower air inlet, enter the lower air blade cavity through the lower air blade cavity inlet, and then be discharged through the lower air duct and the lower air outlet.

4. The cabinet-type air conditioner indoor unit according to claim 3, characterized in that, An upper air inlet blade is rotatably arranged at the upper air inlet, and a lower air inlet blade is rotatably arranged at the lower air inlet; the rotation speeds of the upper air inlet blade and the lower air inlet blade can both be adjusted according to the temperature difference between the indoor air temperature and the preset temperature.

5. The cabinet-type air conditioner indoor unit according to claim 4, characterized in that, The housing includes a left housing wall; a left upper air blade cavity inlet is formed on the axial left side of the upper air blade cavity, and a left lower air blade cavity inlet is formed on the axial left side of the lower air blade cavity; the floor-standing air conditioner indoor unit further includes an indoor heat exchanger, and the indoor heat exchanger includes a left heat exchanger arranged in the housing cavity, and the left heat exchanger includes an A1 heat exchange section and a B1 heat exchange section arranged opposite to each other up and down; the A1 heat exchange section is arranged between the left housing wall and the left upper air blade cavity inlet; the B1 heat exchange section is arranged between the left housing wall and the left lower air blade cavity inlet; and / or, The housing includes a right housing wall; a right upper air blade cavity inlet is formed on the axial right side of the upper air blade cavity, and a right lower air blade cavity inlet is formed on the axial right side of the lower air blade cavity; the floor-standing air conditioner indoor unit further includes an indoor heat exchanger, and the indoor heat exchanger includes a right heat exchanger arranged in the housing cavity, and the right heat exchanger includes an A2 heat exchange section and a B2 heat exchange section arranged opposite to each other up and down; the A2 heat exchange section is arranged between the right housing wall and the right upper air blade cavity inlet; the B2 heat exchange section is arranged between the right housing wall and the right lower air blade cavity inlet.

6. The indoor cabinet air conditioner according to claim 4, characterized in that, The upper air duct includes an upper main air duct and an upper auxiliary air duct. The upper auxiliary air duct is arranged at the top of the upper main air duct and communicates with the upper main air duct and the upper air outlet. The upper main air duct includes an upper main air duct front side wall and an upper main air duct rear side wall which are arranged opposite to each other front and back. The upper main air duct rear side wall corresponds to the housing rear side wall and forms an upper air return opening. The upper air duct rear side wall is rotatably provided with the upper air blocking structure. When the upper air blocking structure rotates towards the direction close to the upper air duct rear side wall, it can block the upper air return opening. When the upper air blocking structure rotates towards the direction close to the upper air duct front side wall, it disconnects the upper main air duct and the upper air blade cavity outlet. The lower air duct includes a lower main air duct and a lower auxiliary air duct. The lower auxiliary air duct is arranged at the bottom of the lower main air duct and communicates with the lower main air duct and the lower air outlet. The lower main air duct includes a lower main air duct front side wall and a lower main air duct rear side wall which are arranged opposite to each other front and back. The lower main air duct rear side wall corresponds to the housing rear side wall and forms a lower air return opening. The lower air duct rear side wall is rotatably provided with the lower air blocking structure. When the lower air blocking structure rotates towards the direction close to the lower air duct rear side wall, it can block the lower air return opening. When the lower air blocking structure rotates towards the direction close to the lower air duct front side wall, it can disconnect the lower main air duct and the lower air blade cavity outlet.

7. The cabinet-type air conditioner indoor unit according to claim 6, characterized in that, The air duct assembly includes a volute and a volute cover. The volute and the volute cover are cooperatively connected to form the upper main air duct, the upper air blade cavity, the lower air blade cavity and the lower main air duct. The air duct assembly further includes an upper ventilation shell and a lower ventilation shell. Both the upper ventilation shell and the lower ventilation shell are arranged in the housing cavity. The upper ventilation shell is arranged at the top of the upper main air duct and forms the upper auxiliary air duct. The lower ventilation shell is arranged at the bottom of the lower main air duct and forms the lower auxiliary air duct.

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 4-7. The control method includes: Determine the target operation mode of the cabinet-type air conditioner indoor unit. Determine the target air return opening and the target air blade according to the target operation mode. Control the opening of the target air return opening and the operation of the target air blade. Adjust the rotation speeds of the upper air inlet blade and the lower air inlet blade according to the target operation mode and the current temperature of the indoor air. Wherein, the target operation mode is the upper air outlet mode or the lower air outlet mode or the upper and lower simultaneous air outlet mode. The target air return opening is the upper air return opening or the lower air return opening. The target air blade is the upper air blade or the lower air blade.

9. The control method of the cabinet-type air conditioner indoor unit according to claim 8, characterized in that, The determining the target air return opening and the target air blade according to the target operation mode includes: When the target operation mode is the upper air outlet mode, determine the target air return opening as the lower air return opening and the target air blade as the upper air blade. When the target operation mode is the lower air outlet mode, determine the target air return opening as the upper air return opening and the target air blade as the lower air blade.

10. The control method of the cabinet-type air conditioner indoor unit according to claim 8, characterized in that, The adjusting the rotation speeds of the upper air inlet blade and the lower air inlet blade according to the target operation mode and the current temperature of the indoor air includes: Compare the current temperature with the preset temperature. When the current temperature is less than the preset temperature and the target operation mode is the upper air outlet mode, adjust the rotation speeds of both the upper air inlet blade and the lower air inlet blade to the first preset rotation speed; When the current temperature is greater than or equal to the preset temperature and the target operation mode is the upper air outlet mode, adjust the rotation speeds of both the upper air inlet blade and the lower air inlet blade to the second preset rotation speed; When the current temperature is less than the preset temperature and the target operation mode is the lower air outlet mode, adjust the rotation speeds of both the upper air inlet blade and the lower air inlet blade to the third preset rotation speed; When the current temperature is greater than or equal to the preset temperature and the target operation mode is the lower air outlet mode, adjust the rotation speeds of both the upper air inlet blade and the lower air inlet blade to the fourth preset rotation speed; When the target operation mode is the upper and lower simultaneous air outlet mode, adjust the rotation speeds of both the upper air inlet blade and the lower air inlet blade to the fifth preset rotation speed; Wherein, the first preset rotation speed is less than the second preset rotation speed; the third preset rotation speed is less than the fourth preset rotation speed.

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