Indoor unit and control method thereof

Abstract

The embodiment of the invention provides an indoor unit and a control method thereof, and relates to the technical field of air conditioners. The indoor unit comprises a winding shaft, an unwinding shaft, a support, a filter screen, a detection sensor and a controller, the two ends of the filter screen are wound between the unwinding shaft and the winding shaft respectively, the middle of the filter screen is supported on the support, the air inlet and the air outlet are located in the two opposite sides of the filter screen respectively, and the filter screen is used for filtering air entering the air inlet; the detection sensor is used for detecting the cleanliness of the filter screen; and the controller is used for controlling the winding shaft to wind the dirty part of the filter screen and the unwinding shaft to unwind the clean part of the filter screen under the condition that the cleanliness of the filter screen is lower than a preset value, so that the filter screen is automatically recycled and updated in time, the waste of the filter screen is avoided, and the filtering performance of the filter screen can be ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and in particular to an indoor unit and a control method thereof. Background Art

[0002] After the filter in the existing indoor unit has been used for a period of time, it is generally manually disassembled to clean the filter, which is not only troublesome to operate and has low cleaning efficiency, but also frequent disassembly and assembly can easily cause damage to the indoor unit.

[0003] At present, some indoor units are designed with automatic filter recycling and updating structures. For example, the filter is set on a rotating shaft, and the dirty filter is rolled up and the clean filter is laid by rotating the rotating shaft. However, there is no clear and accurate judgment on when to roll up and lay the filter. If it is completely based on the user's subjective judgment, it is easy to cause the filter to be rolled up too early and wasted, or laid too late and reduce the filtering performance. Summary of the invention

[0004] The problem solved by the present invention is that there is no clear and accurate judgment on when to roll up and lay the filter screen, which easily causes the filter screen to be wasted due to premature rolling up or reduced filtering performance due to late laying.

[0005] In order to solve the above problems, in a first aspect, the present invention provides an indoor unit, the indoor unit comprising:

[0006] A shell body, wherein an air inlet is provided at the top of the shell body, and an air outlet is provided at the bottom of the shell body;

[0007] A reel is rotatably mounted on the top of the housing;

[0008] An unwinding shaft is rotatably mounted at the bottom of the housing;

[0009] A bracket is installed in the housing and located between the unwinding shaft and the rewinding shaft;

[0010] The filter screen has two ends wound between the unwinding shaft and the rewinding shaft, the middle part of the filter screen is supported on the bracket, the air inlet and the air outlet are located on opposite sides of the filter screen, and the filter screen is used to filter the air entering the air inlet;

[0011] A detection sensor is installed in the housing, and is used to detect the cleanliness of the filter;

[0012] The controller is connected to the detection sensor. When the cleanliness of the filter is lower than a preset value, the controller is used to control the reel to reel in the dirty part of the filter and the unreel to unreel the clean part of the filter.

[0013] The indoor unit provided by the embodiment of the present invention has the following beneficial effects:

[0014] 1. The filter is supported in the housing by the unwinding shaft, bracket and rewinding shaft. When the cleanliness of the part of the filter being used is too low, the dirty part of the filter can be rewound by the rewinding shaft. At the same time, the unwinding shaft releases a new clean filter to realize the recycling and updating of the filter. There is no need to disassemble the machine, the operation is simple and the updating efficiency is high.

[0015] 2. A detection sensor is provided to detect the cleanliness of the filter. When the cleanliness of the filter is lower than the preset value, the reel automatically reels in the dirty part of the filter and the unreel automatically unreels the clean part of the filter, thereby realizing timely and automatic recovery and updating of the filter. This not only avoids waste of the filter but also ensures the filtering performance of the filter.

[0016] In an optional embodiment, the detection sensor includes:

[0017] At least one set of brightness sensors is arranged on two opposite sides of the filter to detect the brightness difference between the two opposite sides of the filter;

[0018] The controller is used to determine that the cleanliness of the filter is lower than a preset value when the brightness difference between the two opposite sides of the filter exceeds a preset brightness difference value.

[0019] Because the dirt is mainly concentrated on the windward side of the filter (the side facing the air inlet), after the filter has been used for a period of time, there is more dirt on the windward side than on the leeward side (the side facing the air outlet). The brightness of the windward side is significantly lower than that of the leeward side, and the brightness difference between the two will gradually increase. When the brightness difference exceeds the preset brightness difference value, it means that there is a lot of dirt on the filter and the filter needs to be recovered and updated.

[0020] In an optional embodiment, the detection sensor further includes:

[0021] At least one set of first bacteria concentration detection sensors is arranged between the unwinding shaft and the winding shaft. The first bacteria concentration detection sensor is used to detect the bacteria concentration on the filter. The controller is used to determine that the cleanliness of the filter is lower than a preset value when the bacteria concentration on the filter exceeds a first preset concentration.

[0022] By using the first bacteria concentration detection sensor to detect the bacteria concentration on the filter, the cleanliness of the filter can be accurately obtained in real time, so that the filter can be automatically recovered and updated in time.

[0023] In an optional implementation manner, the indoor unit further includes:

[0024] The second bacteria concentration detection sensor is installed on one side of the winding shaft. The second bacteria concentration detection sensor is used to detect the bacteria concentration on the filter screen that has been rolled up on the winding shaft. The controller is used to send a prompt signal to clean or replace the filter screen that has been rolled up on the winding shaft when the bacteria concentration on the filter screen that has been rolled up on the winding shaft exceeds a second preset concentration.

[0025] In this way, when the cleanliness of the filter screen rolled up on the winding shaft is too low, a prompt signal can be automatically issued in time so that the dirt on the filter screen can fall off to other parts in the housing.

[0026] In an optional embodiment, the windward surface of the filter screen facing the air inlet is curled toward the winding shaft to be wound around the winding shaft.

[0027] In this way, after the dirt falls on the filter, it will be rolled up onto the reel along with the filter, which can reduce the further spread of the dirt on the filter to other parts in the shell.

[0028] In an optional implementation manner, the indoor unit further includes:

[0029] The first anti-pollution cover is arranged on the reel and is used to prevent the dirt reeled onto the reel along with the filter screen from spreading.

[0030] In this way, it can be further prevented that the dirt on the reel will contaminate other parts in the housing.

[0031] In an optional embodiment, the first anti-pollution cover comprises:

[0032] The cylindrical cover body has a winding shaft arranged in the cylindrical cover body, and a notch is provided on the side wall of the cylindrical cover body, and the notch is used for the filter screen to pass through.

[0033] In this way, the first anti-pollution cover has a simple structure and can provide relatively comprehensive protection for the winding shaft.

[0034] In an optional embodiment, the first anti-pollution cover further comprises:

[0035] A slider connected to the outer wall of the cylindrical cover;

[0036] The slide rail is connected in the shell, and the slider can be slidably matched on the slide rail. The length direction of the slide rail, the length direction of the cylindrical cover body and the length direction of the winding shaft are parallel or overlapped with each other.

[0037] In this way, the cylindrical cover body is slidably connected to the slide rail through the slider, and when the filter screen on the reel needs to be disassembled and cleaned, the cylindrical cover body can be moved first, thereby improving the convenience of disassembly and assembly.

[0038] In a second aspect, the present invention provides a control method for an indoor unit, the control method is used to control the indoor unit of the aforementioned embodiment, and the control method includes:

[0039] Use detection sensors to detect the cleanliness of the filter;

[0040] When the cleanliness of the filter is lower than a preset value, the reel is controlled to reel in the dirty part of the filter and the unreel is controlled to unreel the clean part of the filter.

[0041] In an optional embodiment, the step of detecting the cleanliness of the filter screen using a detection sensor includes:

[0042] The brightness sensor is used to detect the brightness difference between the two opposite sides of the filter; when the brightness difference between the two opposite sides of the filter exceeds a preset brightness difference value, it is determined that the cleanliness of the filter is lower than the preset value;

[0043] And / or, using a first bacteria concentration detection sensor to detect the bacteria concentration on the filter; when the bacteria concentration on the filter exceeds a first preset concentration, determining that the cleanliness of the filter is lower than a preset value. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of the structure of an indoor unit provided by an embodiment of the present invention;

[0045] Figure 2 is a schematic structural diagram of a first anti-fouling cover and its connecting components;

[0046] Figure 3 and Figure 4 This is a flow chart of a control method for an indoor unit provided by an embodiment of the present invention.

[0047] Description of reference numerals:

[0048] 1-indoor unit; 2-housing; 21-air inlet; 22-air outlet; 3-reeling shaft; 4-unreeling shaft; 5-bracket; 6-filter; 7-first anti-fouling cover; 71-cylindrical cover body; 711-notch; 72-slide rail; 8-evaporator; 9-fan blade; 10-brightness sensor; 11-first bacteria concentration detection sensor; 12-second bacteria concentration detection sensor. DETAILED DESCRIPTION

[0049] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0050] See also Figure 1 The present embodiment provides an indoor unit 1, which includes a housing 2, a reel 3, an unreel 4, a bracket 5, a filter 6, a first anti-fouling cover 7, an evaporator 8, a fan blade 9, a detection sensor and a controller (not shown in the figure). The detection sensor includes a brightness sensor 10 and a first bacteria concentration detection sensor 11.

[0051] The top of the housing 2 is provided with an air inlet 21, and the bottom of the housing 2 is provided with an air outlet 22. The reel 3, the unreel 4, the bracket 5, the filter 6, the first anti-fouling cover 7, the evaporator 8, the fan blade 9 and the detection sensor are all installed in the housing 2.

[0052] The reel 3 is rotatably mounted at the top of the housing 2, and the unwinding shaft 4 is rotatably mounted at the bottom of the housing 2. The reel 3 and the unwinding shaft 4 can both be driven to rotate by a motor. The bracket 5 is located between the unwinding shaft 4 and the reel 3. The bracket 5 can be a guide roller.

[0053] The two ends of the filter 6 are respectively wound between the unwinding shaft 4 and the reeling shaft 3, the middle part of the filter 6 is supported on the bracket 5, the air inlet 21 and the air outlet 22 are respectively located on the opposite sides of the filter 6, and the filter 6 is used to filter the air entering the air inlet 21. In this way, the filter 6 is supported in the housing 2 by the unwinding shaft 4, the bracket 5 and the reeling shaft 3. When the cleanliness of the part of the filter 6 in use is too low, the dirty part of the filter 6 can be reeled up by the reeling shaft 3, and at the same time, the unwinding shaft 4 releases a new clean filter 6, so that the filter 6 can be recycled and updated without disassembling the machine, with simple operation and high updating efficiency.

[0054] The windward surface of the filter 6 facing the air inlet 21 is curled toward the reel 3 to be wound around the reel 3. In this way, after the dirt falls on the filter 6, it will be reeled onto the reel 3 along with the filter 6, which can reduce the dirt on the filter 6 from spreading further to other parts in the housing 2.

[0055] Among them, the part of the filter 6 close to the air inlet 21 generally accumulates more dirt. In this embodiment, the winding shaft 3 is also arranged on the top of the shell 2, so that the dirty and blocked filter 6 can be rolled up onto the winding shaft 3 nearby to prevent the dirt on the filter 6 from further spreading to other internal parts such as the evaporator 8.

[0056] The first anti-pollution cover 7 is arranged on the reel 3, and the first anti-pollution cover 7 is used to prevent the dirt reeled onto the reel 3 with the filter screen 6 from spreading. In this way, the dirt on the reel 3 can be further prevented from contaminating other parts in the housing 2.

[0057] The detection sensor is used to detect the cleanliness of the filter 6. The controller is connected to the detection sensor, and the controller is used to control the reel 3 to reel in the dirty part of the filter 6 and the unreel 4 to unreel the clean part of the filter 6 when the cleanliness of the filter 6 is lower than the preset value, so as to realize the timely automatic recovery and update of the filter 6, which not only does not cause the waste of the filter 6, but also can ensure the filtering performance of the filter 6.

[0058] Specifically, at least one set of brightness sensors 10 is arranged on opposite sides of the filter 6 to detect the brightness difference between the opposite sides of the filter 6; the controller is used to determine that the cleanliness of the filter 6 is lower than the preset value when the brightness difference between the opposite sides of the filter 6 exceeds the preset brightness difference value. Because the dirt is mainly concentrated on the windward side of the filter 6 (the side facing the air inlet 21), after the filter 6 is used for a period of time, the dirt on the windward side is more than the leeward side (the side facing the air outlet 22), and the brightness of the windward side is significantly lower than that of the leeward side. The brightness difference between the two will gradually increase. When the brightness difference exceeds the preset brightness difference value, it can be said that there is a lot of dirt on the filter 6, and the filter 6 needs to be recycled and updated.

[0059] In this embodiment, two groups of brightness sensors 10 are provided, which are respectively provided at positions near the air inlet 21 and the air outlet 22 on the filter 6. The brightness sensors 10 at different positions can be set with preset brightness difference values ​​of different sizes. For example, the preset brightness difference value corresponding to the brightness sensor 10 near the air inlet 21 can be greater than the preset brightness difference value corresponding to the brightness sensor 10 near the air outlet 22.

[0060] At least one set of first bacteria concentration detection sensors 11 is arranged between the unwinding shaft 4 and the reeling shaft 3. The first bacteria concentration detection sensor 11 is used to detect the bacteria concentration on the filter 6. The controller is used to determine that the cleanliness of the filter 6 is lower than a preset value when the bacteria concentration on the filter 6 exceeds a first preset concentration. By using the first bacteria concentration detection sensor 11 to detect the bacteria concentration on the filter 6, the cleanliness of the filter 6 can be accurately obtained in real time, so as to automatically recycle and update the filter 6 in a timely manner.

[0061] In this embodiment, two groups of first bacteria concentration detection sensors 11 are provided, which are respectively provided at positions near the air inlet 21 and the air outlet 22 on the filter 6. The first bacteria concentration detection sensors 11 at different positions can be set with first preset concentrations of different sizes. For example, the first preset concentration corresponding to the first bacteria concentration detection sensor 11 near the air inlet 21 can be greater than the first preset concentration corresponding to the first bacteria concentration detection sensor 11 near the air outlet 22.

[0062] Of course, when the width of the filter screen 6 is relatively large, a plurality of brightness sensors 10 or first bacteria concentration detection sensors 11 may be arranged at intervals along the width direction of the filter screen 6 to obtain accurate cleanliness of the filter screen 6 .

[0063] See also Figure 2The first anti-fouling cover 7 includes a cylindrical cover body 71, a slider (not shown) and a slide rail 72. The reel 3 is arranged in the cylindrical cover body 71. A notch 711 is provided on the side wall of the cylindrical cover body 71. The notch 711 is used for the filter screen 6 to pass through. In this way, the cylindrical cover body 71 has a simple structure and can provide a relatively comprehensive protection for the reel 3. The slider is connected to the outer wall of the cylindrical cover body 71; the slide rail 72 is connected to the housing 2, and the slider can be slidably matched on the slide rail 72. The length direction of the slide rail 72, the length direction of the cylindrical cover body 71 and the length direction of the reel 3 are parallel or overlapped with each other. In this way, the cylindrical cover body 71 is slidably connected to the slide rail 72 through the slider. When the filter screen 6 on the reel 3 needs to be disassembled and washed, the cylindrical cover body 71 can be moved first to improve the convenience of disassembly and assembly.

[0064] The length of the cylindrical cover 71 is greater than the width of the filter 6 , which is beneficial for the filter 6 rolled up onto the winding shaft 3 to be stored in the cylindrical cover 71 as much as possible even if dirt falls off.

[0065] The diameter of the cylindrical cover 71 can be determined according to the diameter of the winding shaft 3 and the thickness of the filter 6, or the cylindrical cover 71 with various diameters can be designed for use in different scenarios. The cylindrical cover 71 can also be designed as multiple sections of mutually spliced ​​and detachable cylindrical sections, which facilitates the removal and cleaning of the cylindrical cover 71 and the filter 6 on the winding shaft 3.

[0066] In other embodiments, the first anti-fouling cover 7 may also be designed to be detachably engaged with the housing 2 to accommodate a situation in which there is insufficient sliding space in the housing 2 .

[0067] It is easy to understand that a second anti-fouling cover (not shown) can also be provided on the unwinding shaft 4 to prevent the dirt in the housing 2 from contaminating the filter screen 6 on the unwinding shaft 4 .

[0068] The indoor unit 1 further includes a second bacteria concentration detection sensor 12. The second bacteria concentration detection sensor 12 is installed on one side of the reel 3. The second bacteria concentration detection sensor 12 is used to detect the bacteria concentration on the reeled filter 6 on the reel 3. The controller is used to send a prompt signal to clean or replace the reeled filter 6 on the reel 3 when the bacteria concentration on the reeled filter 6 on the reel 3 exceeds a second preset concentration. In this way, when the cleanliness of the reeled filter 6 on the reel 3 is too low, a prompt signal can be automatically sent in time so that the dirt on the filter 6 falls off to other parts in the housing 2.

[0069] See also Figure 3 This embodiment also provides a control method for the indoor unit 1, the control method comprising:

[0070] S1: Detect the cleanliness of the filter 6 using a detection sensor.

[0071] The detection sensor includes a brightness sensor 10, a first bacteria concentration detection sensor 11 and a second bacteria concentration detection sensor 12. The brightness sensor 10 is used to detect the brightness difference between the two opposite sides of the filter 6. The first bacteria concentration detection sensor 11 is used to detect the bacteria concentration on the filter 6. The second bacteria concentration detection sensor 12 is used to detect the bacteria concentration on the filter 6 rolled up on the winding shaft 3.

[0072] S2: Determine whether the cleanliness of the filter 6 is lower than a preset value.

[0073] When the cleanliness of the filter screen 6 is lower than the preset value, S3 is executed.

[0074] Among them, when the brightness difference on the two opposite sides of the filter 6 exceeds the preset brightness difference value, the cleanliness of the filter 6 is determined to be lower than the preset value; or, when the bacteria concentration on the filter 6 exceeds the first preset concentration, the cleanliness of the filter 6 is determined to be lower than the preset value.

[0075] Of course, in order to further extend the service life of the filter 6, it can be set that when the brightness difference on the two opposite sides of the filter 6 exceeds the preset brightness difference value and the bacteria concentration on the filter 6 exceeds the first preset concentration, the cleanliness of the filter 6 is determined to be lower than the preset value.

[0076] When the cleanliness of the filter screen 6 is not lower than the preset value, S4 is executed.

[0077] S3: Control the reel-up shaft 3 to reel up the dirty part of the filter screen 6 and the unreel-up shaft 4 to unreel the clean part of the filter screen 6 until the cleanliness detected by the detection sensor is not lower than a preset value.

[0078] S4: Maintain the current state of the filter 6.

[0079] See also Figure 4 , S5 can also be executed in real time during the entire process of executing the control method.

[0080] S5: Utilize the second bacteria concentration detection sensor 12 to detect the bacteria concentration on the filter screen 6 rolled up on the winding shaft 3 .

[0081] S6: Determine whether the bacterial concentration on the filter screen 6 rolled up on the winding shaft 3 exceeds a second preset concentration.

[0082] When the bacteria concentration on the filter screen 6 rolled up on the winding shaft 3 exceeds the second preset concentration, wherein the second preset concentration is greater than the first preset concentration, S7 is executed.

[0083] When the bacteria concentration on the filter screen 6 rolled up on the winding shaft 3 does not exceed the second preset concentration, the process returns to S5.

[0084] S7: Sending a prompt signal to clean or replace the rolled filter screen 6 on the winding shaft 3.

[0085] The indoor unit 1 and the control method thereof provided in this embodiment have the following beneficial effects:

[0086] 1. The filter 6 is supported in the housing 2 by the unwinding shaft 4, the bracket 5 and the reeling shaft 3. When the cleanliness of the part of the filter 6 in use is too low, the dirty part of the filter 6 can be reeled up by the reeling shaft 3. At the same time, the unwinding shaft 4 releases a new clean filter 6, so that the filter 6 can be recycled and updated without disassembling the machine, which is simple to operate and has high updating efficiency.

[0087] 2. A detection sensor is provided to detect the cleanliness of the filter 6. When the cleanliness of the filter 6 is lower than a preset value, the reel 3 automatically reels the dirty part of the filter 6 and the unreel 4 automatically unreels the clean part of the filter 6, so that the filter 6 is automatically recovered and updated in time, which not only does not cause waste of the filter 6, but also ensures the filtering performance of the filter 6;

[0088] 3. A first anti-fouling cover 7 is provided to prevent the dirt rolled onto the reel 3 with the filter screen 6 from spreading, and further prevent the dirt on the reel 3 from contaminating other parts in the housing 2.

[0089] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. An indoor unit, characterized in that: The indoor unit comprises: A shell (2), wherein an air inlet (21) is provided at the top of the shell (2), and an air outlet (22) is provided at the bottom of the shell (2); A reel (3) rotatably mounted on the top of the housing (2); An unwinding shaft (4) rotatably mounted at the bottom of the housing (2); A bracket (5) is installed in the housing (2) and is located between the unwinding shaft (4) and the rewinding shaft (3); A filter (6), wherein two ends of the filter (6) are respectively wound between the unwinding shaft (4) and the reeling shaft (3), a middle portion of the filter (6) is supported on the bracket (5), the air inlet (21) and the air outlet (22) are respectively located on opposite sides of the filter (6), and the filter (6) is used to filter the air entering the air inlet (21); A detection sensor is installed in the housing (2), and is used to detect the cleanliness of the filter (6); A controller is connected to the detection sensor, and is used to control the reel (3) to reel in the dirty part of the filter (6) and the unreel (4) to unreel the clean part of the filter (6) when the cleanliness of the filter (6) is lower than a preset value.

2. The indoor unit according to claim 1, characterized in that: The detection sensor comprises: At least one set of brightness sensors (10) is arranged on two opposite sides of the filter (6) to detect the brightness difference between the two opposite sides of the filter (6); The controller is used to determine that the cleanliness of the filter (6) is lower than a preset value when the brightness difference between the two opposite sides of the filter (6) exceeds a preset brightness difference value.

3. The indoor unit according to claim 1, characterized in that: The detection sensor also includes: At least one set of first bacteria concentration detection sensors (11) is arranged between the unwinding shaft (4) and the reeling shaft (3), the first bacteria concentration detection sensors (11) being used to detect the bacteria concentration on the filter (6), and the controller being used to determine that the cleanliness of the filter (6) is lower than a preset value when the bacteria concentration on the filter (6) exceeds a first preset concentration.

4. The indoor unit according to claim 1, characterized in that: The indoor unit further comprises: A second bacteria concentration detection sensor (12) is installed on one side of the reel (3), and the second bacteria concentration detection sensor (12) is used to detect the bacteria concentration on the filter screen (6) that has been rolled up on the reel (3). The controller is used to send a prompt signal to clean or replace the filter screen (6) that has been rolled up on the reel (3) when the bacteria concentration on the filter screen (6) that has been rolled up on the reel (3) exceeds a second preset concentration.

5. The indoor unit according to claim 1, characterized in that: The windward surface of the filter (6) facing the air inlet (21) is curled toward the reel (3) so as to be wound onto the reel (3).

6. The indoor unit according to claim 1, characterized in that: The indoor unit further comprises: A first anti-pollution cover (7) is arranged on the reel (3), and the first anti-pollution cover (7) is used to prevent dirt that is reeled onto the reel (3) along with the filter screen (6) from spreading.

7. The indoor unit according to claim 6, characterized in that: The first anti-fouling cover (7) comprises: a cylindrical cover body (71), the winding shaft (3) is arranged in the cylindrical cover body (71), and a notch (711) is provided on the side wall of the cylindrical cover body (71), and the notch (711) is used for the filter screen (6) to pass through.

8. The indoor unit according to claim 7, characterized in that: The first anti-fouling cover (7) further comprises: a sliding block connected to the outer wall of the cylindrical cover body (71); A slide rail (72) is connected inside the housing (2), and the slider can be slidably engaged on the slide rail (72). The length direction of the slide rail (72), the length direction of the cylindrical cover (71), and the length direction of the winding shaft (3) are parallel to or overlap each other.

9. A control method for an indoor unit, characterized in that: The control method is used to control the indoor unit according to claim 1, and the control method comprises: Utilizing the detection sensor to detect the cleanliness of the filter (6); When the cleanliness of the filter (6) is lower than a preset value, the reeling shaft (3) is controlled to reel in the dirty part of the filter (6) and the unreeling shaft (4) is controlled to unreel the clean part of the filter (6).

10. The control method of the indoor unit according to claim 9, characterized in that: The step of using the detection sensor to detect the cleanliness of the filter (6) comprises: A brightness sensor (10) is used to detect the brightness difference between two opposite sides of the filter (6); when the brightness difference between two opposite sides of the filter (6) exceeds a preset brightness difference value, it is determined that the cleanliness of the filter (6) is lower than a preset value; And / or, using a first bacteria concentration detection sensor (11) to detect the bacteria concentration on the filter (6); when the bacteria concentration on the filter (6) exceeds a first preset concentration, determining that the cleanliness of the filter (6) is lower than a preset value.

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