Air conditioner indoor unit and its control method, air conditioner

Abstract

This invention provides an indoor air conditioning unit and its control method, as well as an air conditioner. The indoor air conditioning unit includes an indoor unit body and a fresh air device. The indoor unit body includes a first housing, an air guide plate, and a first fan blade. The first housing has an air duct, a first connecting port, an air supply port for supplying air, and an air inlet for receiving air. The air supply port, air inlet, and first connecting port are all connected to the air duct. The air guide plate is movably connected to the first housing to open and close the air supply port. The fresh air device includes a rotatably disposed second fan blade. When the air guide plate opens the air supply port, indoor stale air is discharged to the outside through the air supply port, the first connecting port, and the exhaust duct under the action of the second fan blade. When the air guide plate closes the air supply port and the first fan blade operates, indoor stale air is discharged to the outside through the air inlet, air duct, first connecting port, and exhaust duct under the combined action of the first and second fan blades. The indoor air conditioning unit of this invention solves the problem of small exhaust volume of the fresh air device in the prior art.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, and more specifically, to an indoor air conditioning unit and its control method, and an air conditioner. Background Technology

[0002] Air conditioners with fresh air functions are becoming increasingly popular and represent a major future trend in air conditioning development, with more and more air conditioners adding fresh air functions.

[0003] However, current fresh air conditioning systems have the following problems:

[0004] The fresh air system has a small exhaust volume and low exhaust efficiency;

[0005] The installation of a fresh air system has led to an increase in the size of the air conditioner, which takes up a lot of space and is not aesthetically pleasing.

[0006] The fresh air system is experiencing poor air intake and high air resistance. Summary of the Invention

[0007] The main objective of this invention is to provide an indoor air conditioning unit and its control method, as well as an air conditioner, to solve the problem of small exhaust volume in existing fresh air devices.

[0008] To achieve the above objectives, according to a first aspect of the present invention, an indoor air conditioning unit is provided, comprising an indoor unit body and a fresh air device. The indoor unit body includes a first housing, an air guide plate, and a first fan blade. The first housing has an air duct, a first connecting port, an air supply port for supplying air, and an air inlet for receiving air. The air supply port, the air inlet, and the first connecting port are all connected to the air duct. The air guide plate is movably connected to the first housing to open and close the air supply port. The first fan blade is rotatably disposed within the air duct. The fresh air device includes a rotatably disposed second fan blade. The exhaust air duct of the fresh air device is connected to the first connecting port. When the air guide plate opens the air supply port, indoor stale air is discharged to the outside through the air supply port, the first connecting port, and the exhaust air duct in sequence under the action of the second fan blade. When the air guide plate closes the air supply port and the first fan blade operates, indoor stale air is discharged to the outside through the air inlet, the air duct, the first connecting port, and the exhaust air duct in sequence under the combined action of the first and second fan blades.

[0009] Furthermore, the fresh air device also includes a second housing, and a second fan blade is disposed inside the second housing; the second housing has an exhaust duct and an inlet, and the first connecting port is connected to the exhaust duct through the inlet.

[0010] Furthermore, the second housing includes a volute and a volute cover, with the second fan blade disposed within the volute. The volute has a volute inlet and a volute outlet. The volute cover has an inlet, a second connecting port, and an air outlet. The volute cover has a first cavity, a second cavity, and a third cavity. The inlet and the volute inlet are both connected to the first cavity, and the second connecting port is connected to the second cavity. The air outlet and the volute outlet are both connected to the third cavity. The first cavity and the second cavity are connected through the third connecting port. The second cavity and the third cavity are connected through a fourth connecting port. The air inlet, outlet, third connecting port, and fourth connecting port are all connected and can be opened and closed. The fresh air device has an exhaust mode. When the fresh air device is in the exhaust mode, the inlet and fourth connecting port are both open, and the third connecting port and outlet are both closed, so that the indoor stale air passes through the inlet, the first cavity, the volute inlet, the volute outlet, the third cavity, the fourth connecting port, and the second cavity in sequence, and is then discharged to the outside through the second connecting port. The first cavity, the cavity of the volute, the third cavity, and the second cavity are connected in sequence to form an exhaust duct.

[0011] Furthermore, the indoor unit body has a first end and a second end that are arranged opposite to each other, the fresh air device is arranged at the second end of the indoor unit body, and the first cavity is located on the side of the volute close to the indoor unit body; the fresh air device has a first end and a second end that are arranged opposite to each other, the first end of the fresh air device is connected to the second end of the indoor unit body, the first communication port is arranged at the second end of the indoor unit body, and the inlet is arranged at the first end of the fresh air device.

[0012] Furthermore, the fresh air device has an air intake state. When the fresh air device is in the air intake state, the inlet and the fourth connecting port are closed, and the third connecting port and the air outlet are open, so that the outdoor fresh air passes through the second connecting port, the second cavity, the third connecting port, the first cavity, the volute inlet, the volute outlet and the third cavity in sequence, and is then delivered to the room through the air outlet; wherein, the second cavity, the first cavity, the cavity of the volute and the third cavity are connected in sequence to form an air intake duct.

[0013] Furthermore, the fresh air device also includes a first damper and a second damper. The first damper is movably connected to the second housing and has a first position where the inlet is open and the third connecting port is closed, and a second position where the inlet is closed and the third connecting port is open. The second damper is movably connected to the second housing and has a third position where the outlet is closed and the fourth connecting port is open, and a fourth position where the outlet is open and the fourth connecting port is closed. When the fresh air device is in exhaust mode, the first damper switches to the first position and the second damper switches to the third position. When the fresh air device is in intake mode, the first damper switches to the second position and the second damper switches to the fourth position.

[0014] Furthermore, the fresh air device is divided into a first side and a second side by a reference plane, the axis of the second fan blade coincides with the reference plane, and the second connecting port and the air outlet are set on the first side or the second side of the fresh air device.

[0015] Furthermore, the angle between the axis of the second connecting port and the plane where the volute inlet is located is the first preset angle A; wherein, 0°<A≤90°.

[0016] Furthermore, the indoor unit body has a first end and a second end that are arranged opposite to each other, and the first end of the indoor unit body is the first end in the length direction of the air conditioner indoor unit; the fresh air device has a first end and a second end that are arranged opposite to each other, and the fresh air device is disposed at the second end of the indoor unit body, the first end of the fresh air device is connected to the second end of the indoor unit body, and the second end of the fresh air device is the second end in the length direction of the air conditioner indoor unit; the mounting end face of the first housing is used for fixed connection with the mounting base, and the included angle between the mounting end face and the end face where the second end of the fresh air device is located is a second preset included angle B; wherein, 30°≤B≤90°.

[0017] According to a second aspect of the present invention, a control method for an indoor air conditioning unit is provided, applicable to the aforementioned indoor air conditioning unit. The control method for the indoor air conditioning unit includes: acquiring the air quality index Z and ambient temperature in the indoor environment; calculating the temperature difference ΔH between the ambient temperature and a set temperature; determining the relationship between the air quality index Z and the air quality index threshold K; and when Z≥K+K*10% and ΔH is less than or equal to the preset temperature difference, controlling the indoor air conditioning unit to enter a first exhaust mode, thereby controlling the air guide vane of the indoor air conditioning unit to close, and controlling the first and second fan blades of the indoor air conditioning unit to operate, so that indoor polluted air is discharged to the outside through the air inlet, air duct, first connecting port and exhaust duct of the indoor air conditioning unit in sequence under the combined action of the first and second fan blades.

[0018] Furthermore, the method for controlling the indoor unit of the air conditioner to enter the first exhaust mode includes: controlling the fresh air device of the indoor unit of the air conditioner to enter the exhaust state, so that the first damper of the indoor unit of the air conditioner is switched to the first position, and the second damper of the indoor unit of the air conditioner is switched to the third position.

[0019] Furthermore, the control method for the indoor unit of the air conditioner includes: when Z≥K+K*10% and △H is greater than the preset temperature difference, controlling the indoor unit of the air conditioner to enter the cooling mode or heating mode, and putting the fresh air device of the indoor unit of the air conditioner into the air intake state, so that the first air damper of the indoor unit of the air conditioner switches to the second position, and the second air damper of the indoor unit of the air conditioner switches to the fourth position.

[0020] Furthermore, the control method for the indoor unit of the air conditioner includes: when Z < K + K * 10%, the fresh air device of the indoor unit of the air conditioner switches to the air intake state after being in the exhaust state for a first preset time, and remains in the air intake state for a second preset time, and repeats this cycle.

[0021] Furthermore, the control method for the indoor unit of the air conditioner also includes: recording the time difference t between the indoor unit's start-up and the last shutdown; after the indoor unit receives the start-up command and before determining the relationship between the air quality index Z and the air quality index threshold K, the control method for the indoor unit further includes: determining the relationship between the time difference t and a third preset duration; when the time difference t is less than the third preset duration, executing the step of determining the relationship between the air quality index Z and the air quality index threshold K; when the time difference t is greater than and equal to the third preset duration, controlling the indoor unit to enter the sterilization mode, so that the fresh air device of the indoor unit enters the exhaust state, so that the first air damper of the indoor unit switches to the first position, and the second air damper of the indoor unit switches to the third position; and controlling the air guide plate to close and controlling the first fan blade to operate.

[0022] Furthermore, when the time difference t is greater than or equal to the third preset duration, the control method for the indoor unit of the air conditioner also includes: as the time difference t increases, the duration of the indoor unit of the air conditioner in the sterilization mode increases.

[0023] According to a third aspect of the present invention, an air conditioner is provided, comprising the above-described indoor air conditioning unit.

[0024] According to the technical solution of this invention, the indoor unit of an air conditioner includes an indoor unit body and a fresh air device. The indoor unit body includes a first housing, an air guide plate, and a first fan blade. The first housing has an air duct, a first connecting port, an air supply port, and an air inlet. The fresh air device includes a second fan blade. When the air guide plate opens the air supply port, the second fan blade rotates, causing indoor stale air to pass sequentially through the air supply port, the first connecting port, and the exhaust duct to be discharged outdoors. When the air guide plate closes the air supply port and the first fan blade rotates, indoor stale air, under the combined action of the first and second fan blades, passes sequentially through the air inlet, the air duct, the first connecting port, and the exhaust duct to be discharged outdoors. Since the exhaust duct of the fresh air unit is connected to the first connecting port, when the air supply port is closed, the first fan blade can, together with the second fan blade, send indoor stale air through the first connecting port into the exhaust duct of the fresh air unit, increasing the air volume supplied to the exhaust duct and increasing the air volume of indoor stale air discharged to the outside by the fresh air unit. This solves the problem of small exhaust volume of the fresh air unit in the prior art and improves exhaust efficiency, enabling a rapid improvement in indoor air quality. Attached Figure Description

[0025] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0026] Figure 1 A schematic diagram of an embodiment of an air conditioner indoor unit according to the present invention is shown from a first angle;

[0027] Figure 2 A first-angle cross-sectional view of an embodiment of an air conditioner indoor unit according to the present invention is shown;

[0028] Figure 3 A schematic diagram of the indoor unit body according to an embodiment of an air conditioner indoor unit of the present invention is shown;

[0029] Figure 4 A schematic diagram showing the air guide plate closed according to an embodiment of an air conditioner indoor unit of the present invention is shown;

[0030] Figure 5 A schematic diagram showing the opening of the air guide plate of an embodiment of an air conditioner indoor unit according to the present invention is shown;

[0031] Figure 6 A schematic diagram from a second angle of an embodiment of an air conditioner indoor unit according to the present invention is shown;

[0032] Figure 7 A schematic diagram from a third angle of an embodiment of an air conditioner indoor unit according to the present invention is shown;

[0033] Figure 8 A schematic diagram of a fresh air device from a first angle according to an embodiment of an air conditioner indoor unit of the present invention is shown;

[0034] Figure 9 A cross-sectional view of a fresh air unit according to an embodiment of an air conditioning indoor unit of the present invention is shown from a first angle.

[0035] Figure 10 A schematic diagram of a fresh air device from a second angle according to an embodiment of an air conditioner indoor unit of the present invention is shown;

[0036] Figure 11 A schematic diagram of a fresh air device from a third angle according to an embodiment of an air conditioner indoor unit according to the present invention is shown;

[0037] Figure 12 A schematic diagram of a fresh air device from a fourth angle according to an embodiment of an air conditioner indoor unit of the present invention is shown;

[0038] Figure 13 An exploded schematic diagram of a fresh air intake device according to an embodiment of an air conditioner indoor unit of the present invention is shown;

[0039] Figure 14 A schematic diagram showing the fresh air device in the exhaust state according to an embodiment of an air conditioner indoor unit of the present invention is illustrated.

[0040] Figure 15 A schematic diagram showing the fresh air device in the air intake state according to an embodiment of an air conditioner indoor unit of the present invention is provided.

[0041] Figure 16A schematic diagram of a control method for an indoor air conditioning unit according to the present invention is shown.

[0042] The above figures include the following reference numerals:

[0043] 1. Indoor unit body; 2. Fresh air device; 10. First housing; 11. Air guide plate; 13. First connecting port; 14. Air outlet; 18. Mounting end face; 20. Second fan blade; 21. Exhaust air duct; 22. Second housing; 221. Volute; 2211. Volute inlet; 2212. Volute outlet; 2213. First cavity; 2214. Second cavity; 2215. Third cavity; 2216. Third connecting port; 2217. Fourth connecting port; 222. Volute cover; 2221. Sealing cover; 2222. Main body; 23. Inlet; 24. Second connecting port; 25. Air outlet; 26. Air inlet duct; 27. First damper; 28. Second damper; 29. ​​Air duct. Detailed Implementation

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0045] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0046] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0047] This invention provides an indoor air conditioning unit; please refer to [the following text is missing]. Figures 1 to 15The system includes an indoor unit body 1 and a fresh air device 2. The indoor unit body 1 includes a first housing 10, an air guide plate 11, and a first fan blade. The first housing 10 has an air duct, a first connecting port 13, an air supply port 14 for supplying air, and an air inlet for receiving air. The air supply port 14, the air inlet, and the first connecting port 13 are all connected to the air duct. The air guide plate 11 is movably connected to the first housing 10 to open and close the air supply port 14. The first fan blade is rotatably disposed within the air duct. The fresh air device 2 includes a rotatably disposed... The second fan blade 20 and the exhaust duct 21 of the fresh air device 2 are connected to the first connecting port 13. When the air guide plate 11 opens the air supply port 14, the indoor polluted air is discharged to the outside through the air supply port 14, the first connecting port 13 and the exhaust duct 21 in sequence under the action of the second fan blade 20. When the air guide plate 11 closes the air supply port 14 and the first fan blade operates, the indoor polluted air is discharged to the outside through the air inlet, the duct, the first connecting port 13 and the exhaust duct 21 in sequence under the combined action of the first fan blade and the second fan blade 20.

[0048] The indoor unit of the air conditioner of the present invention includes an indoor unit body 1 and a fresh air device 2. The indoor unit body 1 includes a first housing 10, an air guide plate 11, and a first fan blade. The first housing 10 has an air duct, a first connecting port 13, an air supply port 14, and an air inlet. The fresh air device 2 includes a second fan blade 20. When the air guide plate 11 opens the air supply port 14, the second fan blade 20 rotates, so that the indoor stale air passes through the air supply port 14, the first connecting port 13, and the exhaust air duct 21 in sequence and is discharged to the outside. When the air guide plate 11 closes the air supply port 14 and the first fan blade rotates, the indoor stale air passes through the air inlet, the air duct, the first connecting port 13, and the exhaust air duct 21 in sequence and is discharged to the outside under the combined action of the first fan blade and the second fan blade 20. Since the exhaust duct 21 of the fresh air device 2 is connected to the first connecting port 13, when the air supply port 14 is closed, the first fan blade can, together with the second fan blade 20, send indoor polluted air through the first connecting port 13 into the exhaust duct 21 of the fresh air device 2, thereby increasing the air volume supplied into the exhaust duct 21 and increasing the air volume of indoor polluted air discharged to the outside by the fresh air device 2. This solves the problem of small exhaust volume of the fresh air device in the prior art and improves the exhaust efficiency, enabling the indoor air quality to improve rapidly.

[0049] Specifically, when the air guide plate 11 is closed, the first fan blade is opened, and the indoor unit of the air conditioner blows air into the exhaust duct 21 of the fresh air device through the first connecting port 13. The first fan blade gives the airflow a certain initial pressure value. When the airflow passes through the second fan blade 20, it is pressurized again and then discharged to the outside, so that the indoor unit of the air conditioner can achieve secondary pressurization and exhaust, thereby increasing the air volume discharged to the outside by the fresh air device 2.

[0050] In this embodiment, the fresh air device 2 also includes a second housing 22, and a second fan blade 20 is disposed inside the second housing 22; the second housing 22 has an exhaust duct 21 and an inlet 23, and the first connecting port 13 is connected to the exhaust duct 21 through the inlet 23.

[0051] Specifically, when the air guide plate 11 opens the air outlet 14, the indoor stale air is discharged to the outside through the air outlet 14, the first connecting port 13, the inlet 23 and the exhaust duct 21 in sequence under the action of the second fan blade 20; when the air guide plate 11 closes the air outlet 14 and the first fan blade operates, the indoor stale air is discharged to the outside through the air inlet, the duct, the first connecting port 13, the inlet 23 and the exhaust duct 21 in sequence under the combined action of the first fan blade and the second fan blade 20.

[0052] In this embodiment, the second housing 22 includes a volute 221 and a volute cover 222, and the second fan blade 20 is disposed inside the volute 221. The volute 221 has a volute inlet 2211 and a volute outlet 2212. The volute cover 222 is provided with an inlet 23, a second connecting port 24, and an air outlet 25. The volute cover 222 has a first cavity 2213, a second cavity 2214, and a third cavity 2215. The inlet 23 and the volute inlet 2211 are both connected to the first cavity 2213, and the second connecting port 24 is connected to the second cavity 2214. The air outlet 25 and the volute outlet 2212 are both connected to the third cavity 2215. The first cavity 2213 and the second cavity 2214 are connected through the third connecting port 2216. The second cavity 2214 and the third cavity... 2215 is connected through the fourth connecting port 2217; the inlet 23, the outlet 25, the third connecting port 2216 and the fourth connecting port 2217 can all be opened and closed. The fresh air device 2 has an exhaust state. When the fresh air device 2 is in the exhaust state, the inlet 23 and the fourth connecting port 2217 are both open, and the third connecting port 2216 and the outlet 25 are both closed, so that the indoor stale air passes through the inlet 23, the first cavity 2213, the volute inlet 2211, the volute outlet 2212, the third cavity 2215, the fourth connecting port 2217 and the second cavity 2214 in sequence and is then discharged to the outside through the second connecting port 24; wherein, the first cavity 2213, the cavity of the volute 221, the third cavity 2215 and the second cavity 2214 are connected in sequence to form the exhaust duct 21.

[0053] Specifically, the fresh air device 2 also includes a duct 29, with both ends of the duct 29 connected to the second connection port 24 and the outside, respectively. Indoor stale air is discharged to the outside after passing through the inlet 23, the first cavity 2213, the volute inlet 2211, the volute outlet 2212, the third cavity 2215, the fourth connection port 2217, the second cavity 2214, the second connection port 24, and the duct 29. The fresh air device 2 only needs to be equipped with one duct 29 to meet the air intake and exhaust needs of the fresh air device 2, without the need to drill additional holes to install other ducts, thereby reducing damage to the wall and making the installation of the air conditioner indoor unit more aesthetically pleasing.

[0054] Specifically, the volute cover 222 includes a sealing cover 2221 and a main body 2222. The sealing cover 2221 and the main body 2222 are detachably connected. The inlet 23 is provided on the sealing cover 2221, and the second connecting port 24 and the air outlet 25 are provided on the main body 2222. The sealing cover 2221 and the main body 2222 are separately provided to facilitate the processing and forming of the volute cover 222. The volute 221 also includes a guide ring, which is provided at the volute inlet 2211 to guide the gas passing through the volute inlet 2211.

[0055] In specific implementation, such as Figure 14 As shown, when the fresh air device 2 is in exhaust mode, both inlet 23 and fourth connecting port 2217 are open, the second cavity 2214 and the third cavity 2215 are connected, the third connecting port 2216 and the air outlet 25 are closed, and the first cavity 2213 and the second cavity 2214 are not connected. Indoor stale air enters the cavity of the volute 221 through inlet 23, the first cavity 2213 and the volute inlet 2211, flows into the third cavity 2215 from the volute outlet 2212, and then enters the second cavity 2214 through the fourth connecting port 2217. Finally, it is discharged outdoors through the second connecting port 24, thus realizing the discharge of indoor stale air.

[0056] In this embodiment, the indoor unit body 1 has a first end and a second end that are arranged opposite to each other. The fresh air device 2 is arranged at the second end of the indoor unit body 1. The first cavity 2213 is located on the side of the volute 221 close to the indoor unit body 1. The fresh air device 2 has a first end and a second end that are arranged opposite to each other. The first end of the fresh air device 2 is connected to the second end of the indoor unit body 1. The first communication port 13 is arranged at the second end of the indoor unit body 1. The inlet 23 is arranged at the first end of the fresh air device 2.

[0057] Specifically, the fresh air device 2 is installed at the second end of the indoor unit body 1. The first cavity 2213 is located on the side of the volute 221 close to the indoor unit body 1 and near the first connecting port 13. The first cavity 2213 is adjacent to the evaporator. The volute 221 and the second fan blade 20 are located on the side away from the evaporator. This arrangement shortens the airflow path, allowing indoor stale air to flow directly into the inlet 23 after exiting from the first connecting port 13, reducing unnecessary airflow loss. The first connecting port 13 is directly connected to the inlet 23 without the need for additional connecting pipes, which saves costs and improves the assembly reliability of the air conditioning indoor unit, further increasing the air volume exhausted to the outside by the fresh air device 2.

[0058] In this embodiment, the fresh air device 2 has an air intake state. When the fresh air device 2 is in the air intake state, the inlet 23 and the fourth connecting port 2217 are both closed, and the third connecting port 2216 and the air outlet 25 are both open, so that the outdoor fresh air passes through the second connecting port 24, the second cavity 2214, the third connecting port 2216, the first cavity 2213, the volute inlet 2211, the volute outlet 2212 and the third cavity 2215 in sequence and is then sent to the room through the air outlet 25; wherein, the cavities of the second cavity 2214, the first cavity 2213, the volute 221 and the third cavity 2215 are connected in sequence to form the air intake duct 26.

[0059] Specifically, such as Figure 15 As shown, when the fresh air device 2 is in the air intake state, both the inlet 23 and the fourth connecting port 2217 are closed, the second cavity 2214 and the third cavity 2215 are not connected, and both the third connecting port 2216 and the air outlet 25 are open. The first cavity 2213 and the second cavity 2214 are connected. Outdoor fresh air enters the cavity of the volute 221 through the second connecting port 24, the second cavity 2214, the third connecting port 2216, the first cavity 2213 and the volute inlet 2211 in sequence, and then enters the third cavity 2215 from the volute outlet 2212 and is sent to the room through the air outlet 25, thus realizing the intake of outdoor fresh air.

[0060] In this embodiment, the fresh air device 2 further includes a first damper 27 and a second damper 28. The first damper 27 is movably connected to the second housing 22. The first damper 27 has a first position where the inlet 23 is opened and the third connecting port 2216 is closed, and a second position where the inlet 23 is closed and the third connecting port 2216 is opened. The second damper 28 is movably connected to the second housing 22. The second damper 28 has a third position where the outlet 25 is closed and the fourth connecting port 2217 is opened, and a fourth position where the outlet 25 is opened and the fourth connecting port 2217 is closed. When the fresh air device 2 is in the exhaust state, the first damper 27 switches to the first position and the second damper 28 switches to the third position. When the fresh air device 2 is in the intake state, the first damper 27 switches to the second position and the second damper 28 switches to the fourth position.

[0061] Specifically, when the fresh air device 2 is in the exhaust state, the first damper 27 moves toward the direction closer to the third connecting port 2216 to close the third connecting port 2216 and open the inlet 23. At this time, the first damper 27 switches to the first position, and the second damper 28 moves toward the direction away from the fourth connecting port 2217 to open the fourth connecting port 2217 and close the outlet 25. At this time, the second damper 28 switches to the third position, and the air duct switches from the inlet air duct 26 to the exhaust air duct 21. When the fresh air device 2 is in the intake state, the first damper 27 moves toward the direction away from the third connecting port 2216 to open the third connecting port 2216 and close the inlet 23. At this time, the first damper 27 switches to the second position, and the second damper 28 moves toward the direction closer to the fourth connecting port 2217 to close the fourth connecting port 2217 and open the outlet 25. At this time, the second damper 28 switches to the fourth position, and the air duct switches from the exhaust air duct 21 to the inlet air duct 26. The air intake and exhaust ducts of the fresh air device 2 can be switched by the first air damper 27 and the second air damper 28. At the same time, it can prevent the backflow of polluted air, reduce the number of air dampers and reduce the size of the fresh air device 2, simplify the control method of the fresh air device and make it easier for users to use.

[0062] In specific implementation, two motors are installed on the volute cover 222. The two motors are respectively driven and connected to the first damper 27 and the second damper 28, so that the two motors drive the first damper 27 and the second damper 28 to rotate. When the fresh air device 2 is in the exhaust state, the first damper 27 switches to the first position and the second damper 28 switches to the third position; when the fresh air device 2 is in the intake state, the first damper 27 switches to the second position and the second damper 28 switches to the fourth position.

[0063] In this embodiment, the fresh air device 2 is divided into a first side and a second side by a reference plane. The axis of the second fan blade 20 coincides with the reference plane. The second connecting port 24 and the air outlet 25 are arranged on the first side or the second side of the fresh air device 2.

[0064] Specifically, the second connecting port 24 and the air outlet 25 are located on the first or second side of the fresh air device 2, which can shorten the air flow path, reduce air loss, and ensure sufficient fresh air volume and exhaust volume.

[0065] In this embodiment, the angle between the axis of the second connecting port 24 and the plane where the volute inlet 2211 is located is a first preset angle A; wherein, 0°<A≤90°. This setting can reduce the resistance encountered by outdoor fresh air when it flows into the volute inlet 2211 from the second connecting port 24, reduce unnecessary wind power loss, and further ensure sufficient fresh air volume entering the room from the air outlet 25.

[0066] In this embodiment, the indoor unit body 1 has a first end and a second end arranged opposite to each other, with the first end of the indoor unit body 1 being the first end along the length of the air conditioner indoor unit; the fresh air device 2 has a first end and a second end arranged opposite to each other, with the fresh air device 2 disposed at the second end of the indoor unit body 1, the first end of the fresh air device 2 connected to the second end of the indoor unit body 1, and the second end of the fresh air device 2 being the second end along the length of the air conditioner indoor unit; the mounting end face 18 of the first housing 10 is used for fixed connection with the mounting base, and the included angle between the mounting end face 18 and the end face where the second end of the fresh air device 2 is located is a second preset included angle B; wherein, 30°≤B≤90°, and the mounting base is a wall. This arrangement reduces the installation height of the fresh air device 2, reduces the size of the air conditioner, saves installation space for the air conditioner indoor unit, helps to beautify the appearance of the air conditioner indoor unit, realizes the diversification of the shape of the air conditioner indoor unit, and allows the air conditioner indoor unit to increase the fresh air volume and exhaust air volume without changing the installation volume.

[0067] It should be noted that the length of the indoor unit body 1 is... Figure 1 The left and right directions are defined in the text, where the indoor unit is a wall-mounted air conditioner, and the length direction of the wall-mounted indoor unit is the horizontal direction when it is installed and used.

[0068] The present invention also provides a control method for an air conditioner indoor unit, applicable to the air conditioner indoor unit in the above embodiments. The control method for the air conditioner indoor unit includes:

[0069] Step S100: Obtain the air quality index Z and ambient temperature in the indoor environment;

[0070] Step S200: Calculate the temperature difference ΔH between the ambient temperature and the set temperature;

[0071] Step S300: Determine the relationship between the air quality index Z and the air quality index threshold K. When Z≥K+K*10% and ΔH is less than or equal to the preset temperature difference, control the indoor unit of the air conditioner to enter the first exhaust mode, so as to control the air guide plate 11 of the indoor unit of the air conditioner to close, and control the first fan blade and the second fan blade 20 of the indoor unit of the air conditioner to operate, so that the indoor polluted air is discharged to the outside through the air inlet, air duct, first connecting port 13 and exhaust air duct 21 of the indoor unit of the air conditioner in sequence under the combined action of the first fan blade and the second fan blade 20.

[0072] The control method for the indoor unit of the air conditioner of the present invention is applicable to the indoor unit of the air conditioner in the above embodiments. The control method for the indoor unit of the air conditioner includes: a control program acquiring the air quality index Z and the ambient temperature in the indoor environment and calculating the temperature difference ΔH between the ambient temperature and the set temperature; the control program judging the relationship between the air quality index Z and the air quality index threshold K. When Z≥K+K*10%, the control program determines that the air quality of the indoor environment is poor, otherwise it determines that the air quality is good; and when ΔH is less than or equal to the preset temperature difference, the control program controls the indoor unit of the air conditioner to enter the first exhaust mode, so that the air guide plate 11 of the indoor unit of the air conditioner closes the air supply port 14, and the first fan blade and the second fan blade 20 together send the indoor polluted air through the air inlet, the air duct and the first connecting port 13 into the exhaust air duct 21 of the fresh air device 2, increasing the air volume sent into the exhaust air duct 21 and increasing the air volume discharged to the outside by the fresh air device 2. Among them, when the indoor unit of the air conditioner is in the first exhaust mode, the indoor unit body suspends cooling and heating.

[0073] In this embodiment, the method for controlling the indoor unit of the air conditioner to enter the first exhaust mode includes: controlling the fresh air device 2 of the indoor unit of the air conditioner to enter the exhaust state, so that the first air damper 27 of the indoor unit of the air conditioner switches to the first position and the second air damper 28 of the indoor unit of the air conditioner switches to the third position.

[0074] In specific implementation, the control program controls the first damper 27 to switch to the first position, so that the first damper 27 closes the third connecting port 2216 and opens the inlet 23. The second damper 28 switches to the third position, so that the second damper 28 opens the fourth connecting port 2217 and closes the air outlet 25. The air duct switches from the air inlet duct 26 to the air outlet duct 21. The indoor air conditioner enters the first exhaust mode. Under the combined action of the first fan blade and the second fan blade 20, the indoor air is discharged to the outside through the air inlet, air duct, first connecting port 13 and exhaust duct 21 of the indoor air conditioner in sequence.

[0075] In this embodiment, the control method for the indoor unit of the air conditioner includes: when Z≥K+K*10% and ΔH is greater than the preset temperature difference, controlling the indoor unit of the air conditioner to enter the cooling mode or heating mode, and causing the fresh air device 2 of the indoor unit to enter the air intake state, so that the first air damper 27 of the indoor unit switches to the second position and the second air damper 28 switches to the fourth position. Specifically, when Z≥K+K*10% and ΔH is greater than the preset temperature difference, the indoor unit of the air conditioner switches to the cooling / heating mode, and the fresh air device 2 enters the air intake state. This maximizes air circulation while ensuring that the indoor temperature does not fluctuate too much.

[0076] Optionally, when ΔH = 1℃, the control program acquires the air quality index Z and ambient temperature in the indoor environment and calculates the temperature difference ΔH between the ambient temperature and the set temperature. When Z ≥ K + K * 10% and ΔH is greater than the preset temperature difference, and when the temperature difference ΔH ≤ 1℃, the air guide plate 11 closes, the first air damper 27 switches to the first position, and the second air damper 28 of the indoor unit switches to the third position, and the indoor unit enters the first exhaust mode. At this time, the indoor unit 1 directly blows air onto the inlet 23, and the airflow is then pressurized again by the fresh air device 2 to improve exhaust efficiency. When the temperature difference ΔH > 1℃, the indoor unit switches to the cooling / heating mode, the air guide plate 11 opens to compensate for the indoor temperature, the first air damper 27 switches to the second position, and the second air damper 28 of the indoor unit switches to the fourth position, and the air conditioner enters the fresh air mode. This setting can maximize air circulation and ensure that the indoor temperature does not fluctuate too much, thus enhancing user comfort.

[0077] In this embodiment, the control method of the indoor unit of the air conditioner includes: when Z < K + K * 10%, the fresh air device 2 of the indoor unit of the air conditioner is in the exhaust state for a first preset time and then switches to the intake state, and is in the intake state for a second preset time, and so on repeatedly.

[0078] In specific implementation, when Z < K + K * 10%, the control program determines that the indoor air quality is good, and the fresh air and exhaust functions of the air conditioner are intelligently switched according to the operating time designed in the program (that is, the fresh air device 2 of the indoor unit of the air conditioner is in the exhaust state for a first preset time, then switches to the intake state, and is in the intake state for a second preset time, and so on).

[0079] Specifically, the indoor unit of the air conditioner also has a second exhaust mode. When the indoor unit is in the second exhaust mode, the air guide plate 11 opens the air supply vent 14, and the indoor stale air is discharged to the outside through the air supply vent 14, the first connecting port 13, and the exhaust duct 21 under the action of the second fan blade 20. When the indoor unit is in the second exhaust mode, the indoor unit can simultaneously cool or heat, and the air guide plate is in the open position. When Z < K + K * 10%, the fresh air device 2 is in exhaust mode, and the indoor unit is in the second exhaust mode.

[0080] In this embodiment, the control method for the indoor unit of the air conditioner further includes: recording the time difference t between the indoor unit of the air conditioner being turned on and the last time it was turned off; after the indoor unit of the air conditioner receives the start command and before determining the relationship between the air quality index Z and the air quality index threshold K, the control method for the indoor unit of the air conditioner further includes: determining the relationship between the time difference t and a third preset duration; when the time difference t is less than the third preset duration, performing the step of determining the relationship between the air quality index Z and the air quality index threshold K; when the time difference t is greater than and equal to the third preset duration, controlling the indoor unit of the air conditioner to enter the sterilization mode, so that the fresh air device 2 of the indoor unit of the air conditioner enters the exhaust state, so that the first air damper 27 of the indoor unit of the air conditioner switches to the first position, and the second air damper 28 of the indoor unit of the air conditioner switches to the third position; and controlling the air guide plate 11 to close, and controlling the first fan blade to operate.

[0081] In specific implementation, after the indoor unit of the air conditioner receives the start command but before determining the relationship between the air quality index Z and the air quality index threshold K, the relationship between the time difference t and the third preset duration is determined. When the time difference t is less than the third preset duration, the step of determining the relationship between the air quality index Z and the air quality index threshold K is executed. When the time difference t is greater than or equal to the third preset duration, the indoor unit of the air conditioner is controlled to enter the sterilization mode, so that the fresh air device 2 of the indoor unit of the air conditioner enters the first exhaust state, so that the first air damper 27 of the indoor unit of the air conditioner switches to the first position, and the second air damper 28 of the indoor unit of the air conditioner switches to the third position. This setting can ensure that the indoor unit of the air conditioner is regularly sterilized and ventilated, avoiding excessive bacteria in the indoor environment and affecting the health of users.

[0082] Optionally, such as Figure 16 As shown, the third preset duration is 24 hours, meaning that when t < 24 hours, the indoor unit of the air conditioner will not enter the sterilization mode; when t ≥ 24 hours, the indoor unit of the air conditioner will enter the sterilization mode before being turned on.

[0083] In this embodiment, when the time difference t is greater than and equal to the third preset duration, the control method of the air conditioner indoor unit further includes: as the time difference t increases, the duration of the air conditioner indoor unit in sterilization mode increases.

[0084] In practice, the duration 'a' of the indoor unit in sterilization mode is determined by the value of 't'. When t = 24 hours, the sterilization mode operation time 'a' = 10 seconds. Thereafter, for every 24-hour increment of 't', the operation time 'a' increases by 10 seconds (e.g., when t = 48 hours, 'a' = 20 seconds, 'a' = t / 24 + 10). Any time exceeding 24 hours is counted as 24 hours. The maximum duration of 'a' is designed to be 120 seconds. This setting ensures that the indoor unit can flexibly adjust the sterilization mode time according to the bacterial content of the indoor environment, guaranteeing the sterilization effect.

[0085] The present invention also provides an air conditioner, including the indoor unit of the air conditioner in the above embodiments.

[0086] The air conditioner of the present invention includes the indoor unit of the air conditioner in the above embodiments. The indoor unit includes an indoor unit body 1 and a fresh air device 2. The indoor unit body 1 includes a first housing 10, an air guide plate 11, and a first fan blade. The first housing 10 has an air duct, a first connecting port 13, an air supply port 14, and an air inlet. The fresh air device 2 includes a second fan blade 20. When the air guide plate 11 opens the air supply port 14, the second fan blade 20 rotates, so that the indoor stale air passes through the air supply port 14, the first connecting port 13, and the exhaust air duct 21 in sequence and is discharged to the outside. When the air guide plate 11 closes the air supply port 14 and the first fan blade rotates, the indoor stale air passes through the air inlet, the air duct, the first connecting port 13, and the exhaust air duct 21 in sequence and is discharged to the outside under the combined action of the first fan blade and the second fan blade 20. Since the exhaust duct 21 of the fresh air device 2 is connected to the first connecting port 13, when the air supply port 14 is closed, the first fan blade can, together with the second fan blade 20, send indoor stale air through the first connecting port 13 into the exhaust duct 21 of the fresh air device 2, thereby increasing the air volume supplied into the exhaust duct 21 and increasing the air volume discharged from the fresh air device 2 to the outside, thus solving the problem of small exhaust volume of the fresh air device in the prior art.

[0087] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects:

[0088] The indoor unit of the air conditioner of the present invention includes an indoor unit body 1 and a fresh air device 2. The indoor unit body 1 includes a first housing 10, an air guide plate 11, and a first fan blade. The first housing 10 has an air duct, a first connecting port 13, an air supply port 14, and an air inlet. The fresh air device 2 includes a second fan blade 20. When the air guide plate 11 opens the air supply port 14, the second fan blade 20 rotates, so that the indoor stale air passes through the air supply port 14, the first connecting port 13, and the exhaust air duct 21 in sequence and is discharged to the outside. When the air guide plate 11 closes the air supply port 14 and the first fan blade rotates, the indoor stale air passes through the air inlet, the air duct, the first connecting port 13, and the exhaust air duct 21 in sequence and is discharged to the outside under the combined action of the first fan blade and the second fan blade 20. Since the exhaust duct 21 of the fresh air device 2 is connected to the first connecting port 13, when the air supply port 14 is closed, the first fan blade can, together with the second fan blade 20, send indoor stale air through the first connecting port 13 into the exhaust duct 21 of the fresh air device 2, thereby increasing the air volume supplied into the exhaust duct 21 and increasing the air volume discharged from the fresh air device 2 to the outside, thus solving the problem of small exhaust volume of the fresh air device in the prior art.

[0089] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0090] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0091] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An indoor unit for an air conditioner, comprising an indoor unit body (1) and a fresh air device (2), characterized in that, The indoor unit body (1) includes a first housing (10), an air guide plate (11), and a first fan blade. The first housing (10) has an air duct, a first connecting port (13), an air outlet (14) for supplying air, and an air inlet for receiving air. The air outlet (14), the air inlet, and the first connecting port (13) are all connected to the air duct. The air guide plate (11) is movably connected to the first housing (10) to open and close the air outlet (14). The first fan blade is rotatably disposed within the air duct. The fresh air device (2) includes a second fan blade (20) that is rotatably arranged. The exhaust duct (21) of the fresh air device (2) is connected to the first connecting port (13). When the air guide plate (11) opens the air supply port (14), indoor polluted air is discharged to the outside through the air supply port (14), the first connecting port (13) and the exhaust duct (21) in sequence under the action of the second fan blade (20). When the air guide plate (11) closes the air supply port (14) and the first fan blade is running, indoor polluted air is discharged to the outside through the air inlet, the duct, the first connecting port (13) and the exhaust duct (21) in sequence under the combined action of the first fan blade and the second fan blade (20). The fresh air device (2) further includes a second housing (22), which includes a volute (221) and a volute cover (222). The volute cover (222) is provided with a second communication port (24). The volute (221) has a volute inlet (2211). The angle between the axis of the second connecting port (24) and the plane where the volute inlet (2211) is located is a first preset angle A; wherein, 0°<A≤90°; The indoor unit body (1) has a first end and a second end that are arranged opposite to each other. The first end of the indoor unit body (1) is the first end of the length direction of the air conditioner indoor unit. The fresh air device (2) has a first end and a second end that are arranged opposite to each other. The fresh air device (2) is disposed at the second end of the indoor unit body (1). The first end of the fresh air device (2) is connected to the second end of the indoor unit body (1). The second end of the fresh air device (2) is the second end of the length direction of the air conditioner indoor unit. The mounting end face (18) of the first housing (10) is used to be fixedly connected to the mounting base. The angle between the mounting end face (18) and the end face where the second end of the fresh air device (2) is located is a second preset angle B; wherein, 30°≤B≤90°.

2. The indoor unit of the air conditioner according to claim 1, characterized in that, The second fan blade (20) is disposed inside the second housing (22); the second housing (22) has the exhaust duct (21) and the inlet (23), and the first communication port (13) is connected to the exhaust duct (21) through the inlet (23).

3. The indoor unit of the air conditioner according to claim 2, characterized in that, The second fan blade (20) is disposed inside the volute (221); the volute (221) has a volute outlet (2212); the volute cover (222) is provided with the inlet (23) and the air outlet (25), the volute cover (222) has a first cavity (2213), a second cavity (2214) and a third cavity (2215), the inlet (23) and the volute inlet (2211) are both connected to the first cavity (2213). The first cavity (2213) and the second cavity (2214) are connected through the third connecting port (2216); the air outlet (25) and the volute outlet (2212) are both connected to the third cavity (2215); the first cavity (2213) and the second cavity (2214) are connected through the third connecting port (2216); the second cavity (2214) and the third cavity (2215) are connected through the fourth connecting port (2217). The inlet (23), the air outlet (25), the third connecting port (2216), and the fourth connecting port (2217) are all closable. The fresh air device (2) has an exhaust mode. When the fresh air device (2) is in the exhaust mode, the inlet (23) and the fourth connecting port (2217) are both open, and the third connecting port (2216) and the air outlet (25) are both closed, so that the indoor stale air passes through the inlet (23), the third connecting port (2216), the fourth connecting port (2217), and the fourth connecting port (2217) in sequence. A cavity (2213), the volute inlet (2211), the volute outlet (2212), the third cavity (2215), the fourth connecting port (2217), and the second cavity (2214) are connected in sequence to form the exhaust duct (21).

4. The indoor unit of the air conditioner according to claim 3, characterized in that, The indoor unit body (1) has a first end and a second end that are arranged opposite to each other. The fresh air device (2) is arranged at the second end of the indoor unit body (1). The first cavity (2213) is located on the side of the volute (221) close to the indoor unit body (1). The fresh air device (2) has a first end and a second end that are arranged opposite to each other. The first end of the fresh air device (2) is connected to the second end of the indoor unit body (1). The first communication port (13) is arranged at the second end of the indoor unit body (1). The inlet (23) is arranged at the first end of the fresh air device (2).

5. The indoor unit of the air conditioner according to claim 3, characterized in that, The fresh air device (2) has an air intake state. When the fresh air device (2) is in the air intake state, the inlet (23) and the fourth connecting port (2217) are both closed, and the third connecting port (2216) and the air outlet (25) are both open, so that the outdoor fresh air passes through the second connecting port (24), the second cavity (2214), the third connecting port (2216), the first cavity (2213), the volute inlet (2211), the volute outlet (2212) and the third cavity (2215) in sequence and is then sent to the room through the air outlet (25); wherein, the second cavity (2214), the first cavity (2213), the cavity of the volute (221) and the third cavity (2215) are connected in sequence to form an air intake duct (26).

6. The indoor unit of the air conditioner according to claim 5, characterized in that, The fresh air device (2) further includes a first damper (27) and a second damper (28). The first damper (27) is movably connected to the second housing (22). The first damper (27) has a first position that opens the inlet (23) and closes the third connecting port (2216) and a second position that closes the inlet (23) and opens the third connecting port (2216). The second damper (28) is movably connected to the second housing (22). The second damper (28) has a third position that closes the air outlet (25) and opens the fourth connecting port (2217) and a fourth position that opens the air outlet (25) and closes the fourth connecting port (2217). When the fresh air device (2) is in the exhaust state, the first damper (27) switches to the first position and the second damper (28) switches to the third position; when the fresh air device (2) is in the intake state, the first damper (27) switches to the second position and the second damper (28) switches to the fourth position.

7. The indoor unit of the air conditioner according to claim 3, characterized in that, The fresh air device (2) is divided into a first side and a second side by a reference plane. The axis of the second fan blade (20) coincides with the reference plane. The second connecting port (24) and the air outlet (25) are located on the first side or the second side of the fresh air device (2).

8. A control method for an indoor unit of an air conditioner, characterized in that, The control method for the air conditioning indoor unit applicable to any one of claims 1 to 7 includes: Obtain the air quality index Z and ambient temperature in the indoor environment; Calculate the temperature difference ΔH between the ambient temperature and the set temperature; Determine the relationship between the air quality index Z and the air quality index threshold K. When Z≥K+K*10% and ΔH is less than or equal to the preset temperature difference, control the indoor unit of the air conditioner to enter the first exhaust mode, so as to control the air guide plate (11) of the indoor unit of the air conditioner to close, and control the first and second fan blades (20) of the indoor unit of the air conditioner to operate, so that the indoor polluted air is discharged to the outside through the air inlet, air duct, first connecting port (13) and exhaust air duct (21) of the indoor unit of the air conditioner in sequence under the combined action of the first fan blade and the second fan blade (20).

9. The control method for an indoor air conditioning unit according to claim 8, characterized in that, The method for controlling the indoor unit of the air conditioner to enter the first exhaust mode includes: Control the fresh air device (2) of the indoor air conditioner to enter the exhaust state, so that the first air damper (27) of the indoor air conditioner is switched to the first position, and the second air damper (28) of the indoor air conditioner is switched to the third position.

10. The control method for an indoor air conditioning unit according to claim 8, characterized in that, The control method for the indoor unit of the air conditioner includes: When Z≥K+K*10% and △H is greater than the preset temperature difference, the air conditioner indoor unit is controlled to enter the cooling mode or heating mode, and the fresh air device (2) of the air conditioner indoor unit is put into the air intake state, so that the first air damper (27) of the air conditioner indoor unit is switched to the second position, and the second air damper (28) of the air conditioner indoor unit is switched to the fourth position.

11. The control method for an indoor air conditioning unit according to claim 8, characterized in that, The control method for the indoor unit of the air conditioner includes: When Z < K + K * 10%, the fresh air device (2) of the indoor unit of the air conditioner switches to the air intake state after being in the exhaust state for a first preset time, and is in the air intake state for a second preset time, and so on.

12. The control method for an indoor air conditioning unit according to claim 8, characterized in that, The control method for the indoor unit of the air conditioner also includes: Record the time difference t between the start-up and the last shutdown of the indoor unit of the air conditioner; After the indoor unit of the air conditioner receives the start command but before determining the relationship between the air quality index Z and the air quality index threshold K, the control method for the indoor unit of the air conditioner further includes: Determine the relationship between the time difference t and the third preset duration. When the time difference t is less than the third preset duration, proceed to determine the relationship between the air quality index Z and the air quality index threshold K. When the time difference t is greater than or equal to the third preset duration, the air conditioner indoor unit is controlled to enter the sterilization mode, so that the fresh air device (2) of the air conditioner indoor unit enters the exhaust state, so that the first air damper (27) of the air conditioner indoor unit is switched to the first position, and the second air damper (28) of the air conditioner indoor unit is switched to the third position; and the air guide plate (11) is controlled to close, and the first fan blade is controlled to operate.

13. The control method for an indoor air conditioning unit according to claim 12, characterized in that, When the time difference t is greater than and equal to the third preset duration, the control method for the indoor unit of the air conditioner further includes: As the time difference t increases, the duration for which the indoor unit of the air conditioner is in the sterilization mode increases.

14. An air conditioner, characterized in that, The indoor unit of the air conditioner includes any one of claims 1 to 7.

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