Indoor unit, air conditioner and control method of indoor unit and air conditioner

Abstract

The invention provides an indoor unit, an air conditioner and a control method thereof.The indoor unit comprises a shell, a main fan, an indoor heat exchanger and a first auxiliary fan, a main air inlet, a first auxiliary air inlet and an air outlet are formed in the shell, and the main fan, the indoor heat exchanger and the first auxiliary fan are all installed in the shell; the indoor heat exchanger is located between the air inlet side of the main fan and the main air inlet, and the first auxiliary air inlet and the air outlet are located in the air inlet side and the air outlet side of the first auxiliary fan correspondingly. According to the indoor unit, the main fan is arranged to return air from the main air inlet and supply air from the air outlet, and the first auxiliary fan is additionally arranged to return air from the first auxiliary air inlet and supply air from the air outlet. Due to the fact that the airflow driven by the first auxiliary fan does not pass through the indoor heat exchanger, the airflow does not exchange heat with the indoor heat exchanger and becomes dry, when the airflow and the airflow driven by the main fan are blown out of the air outlet together, the airflow and the airflow are mixed, and the situation that air supplied by the indoor unit is dry is avoided.

Description

Technical Field

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

[0002] Currently, most air conditioner indoor units on the market use a single cross-flow fan system design. Although this design can meet basic cooling and heating needs, the air output is dry when cooling or heating. Summary of the invention

[0003] Therefore, the present invention provides an indoor unit, which can solve the technical problem of dry air outlet of the existing air conditioner indoor unit during cooling or heating.

[0004] In order to solve the above problems, the present invention provides an indoor unit, comprising: a shell, a main fan, an indoor heat exchanger and a first auxiliary fan, a main air inlet, a first auxiliary air inlet and an air outlet are formed on the shell, the main fan, the indoor heat exchanger and the first auxiliary fan are all installed in the shell, the indoor heat exchanger is located between the air inlet side of the main fan and the main air inlet, the first auxiliary air inlet is located on the air inlet side of the first auxiliary fan, and the air outlet is located on the air outlet side of the first auxiliary fan.

[0005] In some embodiments, the first auxiliary fan is a centrifugal fan, the first auxiliary fan and the first auxiliary air inlet are both located on a first side of the main fan, and the first auxiliary fan is located between the first side of the main fan and the first auxiliary air inlet.

[0006] In some embodiments, a second auxiliary fan is installed in the shell, and a second auxiliary air inlet is formed on the shell. The second auxiliary air inlet is located on the air inlet side of the second auxiliary fan, and the air outlet is located on the air outlet side of the second auxiliary fan.

[0007] In some embodiments, the second auxiliary fan is a centrifugal fan, the second auxiliary fan and the second auxiliary air inlet are both located on the second side of the main fan, and the second auxiliary fan is located between the second side of the main fan and the second auxiliary air inlet.

[0008] In some embodiments, a first control device and a second control device are also installed in the shell, the first control device is communicatively connected with the second control device, the first control device and the first auxiliary fan are located on the first side of the shell, and the second control device and the second auxiliary fan are located on the second side of the shell.

[0009] In some embodiments, the main fan is a cross-flow fan; and / or the first control device is located above the first auxiliary fan, and the second control device is located above the second auxiliary fan.

[0010] In some embodiments, the main fan is a centrifugal fan, and the indoor heat exchanger includes a first heat exchange section, which is inclined relative to the main fan, and the distance between the first heat exchange section and the main fan gradually increases in the direction from the main air inlet to the air outlet.

[0011] In some embodiments, the number of the main fans is two, and the two main fans are spaced apart along the length direction of the shell. The indoor heat exchanger includes two first heat exchange sections, and the two first heat exchange sections are inclined relative to the two main fans, respectively. In the direction from the main air inlet to the air outlet, the distance between the two first heat exchange sections and the two main fans gradually increases.

[0012] The present invention also provides an air conditioner, comprising the aforementioned indoor unit.

[0013] The present invention also provides a control method for an air conditioner, which is used to control the operation of the aforementioned air conditioner, wherein the air conditioner further comprises a compressor, and the control method comprises: when the air conditioner operates in a cooling mode and the compressor operates at a set frequency or stops operating, obtaining an indoor temperature and recording it as T1, obtaining a pipe wall temperature of the indoor heat exchanger and recording it as T2, and when T2>T1-T a When the main fan is controlled to run at a set speed, the first auxiliary fan is controlled to run; wherein, T a Set the temperature to the first level.

[0014] The present invention provides an indoor unit, an air conditioner and a control method thereof, which have the following beneficial effects:

[0015] In addition to the main fan returning air from the air inlet and delivering air from the air outlet, the indoor unit of the present application is also provided with a first auxiliary fan returning air from the first auxiliary air inlet and delivering air from the air outlet. Since the airflow driven by the first auxiliary fan does not pass through the indoor heat exchanger, this part of the airflow will not become dry by heat exchange with the indoor heat exchanger. When it is blown out of the air outlet together with the airflow driven by the main fan, it is mixed, thereby significantly improving the dryness of the air supply of the indoor unit and providing users with a more comfortable and healthy indoor environment. At the same time, the first auxiliary fan can also increase the air output of the indoor unit and improve the air supply distance of the indoor unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0017] Figure 1 is an internal schematic diagram of an air conditioner according to Embodiment 1 of the present invention;

[0018] Figure 2 This is a schematic diagram of the main fan and the auxiliary fan of the air conditioner in the first embodiment of the present invention when the air is supplied in combination;

[0019] Figure 3 This is a schematic diagram of the main fan of the air conditioner according to the first embodiment of the present invention supplying air alone;

[0020] Figure 4 This is a schematic diagram of the auxiliary fan of the air conditioner according to the first embodiment of the present invention supplying air alone;

[0021] Figure 5 is an internal schematic diagram of an air conditioner according to a second embodiment of the present invention;

[0022] Figure 6 A schematic diagram of a main fan and an auxiliary fan of an air conditioner according to a second embodiment of the present invention when mixed air is supplied;

[0023] Figure 7 This is a schematic diagram of the main fan of the air conditioner according to the second embodiment of the present invention supplying air alone;

[0024] Figure 8 This is a schematic diagram of the auxiliary fan of the air conditioner according to the second embodiment of the present invention supplying air alone;

[0025] Fig. 9 4 is a control flow chart of an air conditioner according to an embodiment of the present invention.

[0026] The reference numerals are as follows:

[0027] 1. Shell; 2. Main fan; 3. Indoor heat exchanger; 4. First auxiliary fan; 5. Second auxiliary fan; 6. First control device; 7. Second control device; 8. Main filter; 9. First auxiliary filter; 10. Second auxiliary filter; 11. Air guide plate; 12. Motor; 13. Water tray; 14. Drain outlet. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0030] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0031] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0032] See also Figures 1 to 9As shown, according to an embodiment of the present invention, an indoor unit is provided, comprising: a shell 1, a main fan 2, an indoor heat exchanger 3 and a first auxiliary fan 4, a main air inlet, a first auxiliary air inlet and an air outlet are formed on the shell 1, the main fan 2, the indoor heat exchanger 3 and the first auxiliary fan 4 are all installed in the shell 1, the indoor heat exchanger 3 is located between the air inlet side of the main fan 2 and the main air inlet, the first auxiliary air inlet is located on the air inlet side of the first auxiliary fan 4, and the air outlet is located on the air outlet side of the first auxiliary fan 4.

[0033] In this technical solution, in addition to the main fan 2 for returning air from the air inlet and delivering air from the air outlet, the indoor unit of this application is also provided with a first auxiliary fan 4 for returning air from the first auxiliary air inlet and delivering air from the air outlet. Since the airflow driven by the first auxiliary fan 4 does not pass through the indoor heat exchanger 3, this part of the airflow will not become dry due to heat exchange with the indoor heat exchanger 3. When it is blown out of the air outlet together with the airflow driven by the main fan 2, it is mixed, thereby significantly improving the dryness of the air supply of the indoor unit and providing users with a more comfortable and healthy indoor environment. At the same time, the first auxiliary fan 4 can also increase the air output of the indoor unit and improve the air supply distance of the indoor unit.

[0034] It should be noted that when the air conditioner is cooling, after reaching the specified cooling capacity, the outdoor unit will generally reduce the compressor operating frequency or stop the compressor, and the indoor heat exchanger 3 is prone to rising pipe temperature during continuous heat exchange, causing the blown airflow to produce odor. This application adds a first auxiliary fan 4, and when the pipe temperature of the indoor heat exchanger 3 is high, the speed of the main fan 2 can be reduced, so that the main fan 2 blows out a weak airflow, and the first auxiliary fan 4 starts to compensate, so that the indoor unit can supply air with a mixed airflow, which can greatly dilute the air supply odor and improve the user experience. Among them, the odor generally comes from the temperature rise of the indoor heat exchanger 3 after it stops cooling, and the blown air takes out the water vapor on the indoor heat exchanger 3, and the indoor heat exchanger 3 produces odor due to long-term operation.

[0035] It is understandable that in the hot and humid environment of summer, after the air conditioner is turned off in the cooling state, the condensed water generated on the indoor heat exchanger 3 is often not completely dried, and it is also easy to blow out odor when the air conditioner is started again. However, by adding a first auxiliary fan 4, when the cooling is started again, the first auxiliary fan 4 is started first to send air, and after the condensed water on the indoor heat exchanger 3 evaporates, the main fan 2 is slowly started, so that the blown air can be prevented from having odor.

[0036] See also Figures 1 to 4 As shown, the first auxiliary fan 4 is a centrifugal fan, the first auxiliary fan 4 and the first auxiliary air inlet are both located on the first side of the main fan 2, and the first auxiliary fan 4 is located between the first side of the main fan 2 and the first auxiliary air inlet.

[0037] In this embodiment, the main air inlet is formed at the top of the housing 1, and a main filter 8 is installed at the main air inlet. The air outlet is formed at the intersection of the bottom and the front side of the housing 1, and an air guide plate 11 is installed at the air outlet. The air guide plate 11 is driven by a motor 12 to open or close the air outlet. Figures 1 to 4 As shown, the first side of the main fan 2 refers to the left side of the main fan 2, that is, the first auxiliary air inlet is formed on the left side of the housing 1, the first auxiliary fan 4 is located between the left side of the main fan 2 and the first auxiliary air inlet, and the first auxiliary air inlet is installed with a first auxiliary filter 9. Since the centrifugal fan has the characteristics of axial air inlet and radial air outlet, when the first auxiliary fan 4 is a centrifugal fan, the air inlet side of the first auxiliary fan 4 is just aligned with the first auxiliary air inlet and the air outlet side is just aligned with the air outlet, so as to ensure that the first auxiliary fan 4 can smoothly take in air from the first auxiliary air inlet and smoothly discharge air from the air outlet. Preferably, the axis of the first auxiliary fan 4 is parallel to the center line of the first auxiliary air inlet.

[0038] It should be noted that the axial flow fan can also be arranged obliquely between the first side of the main fan 2 and the first auxiliary air inlet, so that the axial flow fan can also return air through the first auxiliary air inlet and discharge air through the air outlet. Although the axial flow fan cannot accurately align the air inlet side with the first auxiliary air inlet like a centrifugal fan, the axial flow fan is also a feasible solution.

[0039] See also Figures 1 to 4 As shown, a second auxiliary fan 5 is also installed in the shell 1, and a second auxiliary air inlet is also formed on the shell 1. The second auxiliary air inlet is located on the air inlet side of the second auxiliary fan 5, and the air outlet is located on the air outlet side of the second auxiliary fan 5.

[0040] In this technical solution, by adding a second auxiliary fan 5, and making the second auxiliary fan 5 return air from the second auxiliary air inlet and supply air from the air outlet, the airflow driven by the second auxiliary fan 5 does not pass through the indoor heat exchanger 3, so this part of the airflow will not exchange heat with the indoor heat exchanger 3 and become dry. Then, when this part of the airflow is blown out of the air outlet together with the airflow driven by the main fan 2, it is mixed, thereby further improving the dryness of the air supply of the indoor unit. At the same time, the second auxiliary fan 5 can further increase the air output of the indoor unit and improve the air supply distance of the indoor unit. Furthermore, when the air output of the indoor unit produces odor due to condensed water on the indoor heat exchanger 3, the first auxiliary fan 4 and the second auxiliary fan 5 are turned on at the same time to further dilute the odor of the air output.

[0041] See also Figures 1 to 4 As shown, the second auxiliary fan 5 is a centrifugal fan, the second auxiliary fan 5 and the second auxiliary air inlet are both located on the second side of the main fan 2, and the second auxiliary fan 5 is located between the second side of the main fan 2 and the second auxiliary air inlet.

[0042] In this embodiment, if Figures 1 to 4 As shown, the second side of the main fan 2 refers to the right side of the main fan 2, that is, the second auxiliary air inlet is formed on the right side of the housing 1, the second auxiliary fan 5 is located between the right side of the main fan 2 and the second auxiliary air inlet, and the second auxiliary air inlet is installed with a second auxiliary filter 10. Since the centrifugal fan has the characteristics of axial air intake and radial air outlet, when the second auxiliary fan 5 is a centrifugal fan, the air intake side of the second auxiliary fan 5 is just aligned with the second auxiliary air inlet and the air outlet side is just aligned with the air outlet, so as to ensure that the second auxiliary fan 5 can smoothly take in air from the second auxiliary air inlet and smoothly discharge air from the air outlet. Preferably, the axis of the second auxiliary fan 5 is parallel to the center line of the second auxiliary air inlet.

[0043] It should be noted that the axial flow fan can also be arranged obliquely between the second side of the main fan 2 and the second auxiliary air inlet, so that the axial flow fan can also return air through the second auxiliary air inlet and discharge air through the air outlet. Although the axial flow fan cannot accurately align the air inlet side with the second auxiliary air inlet like a centrifugal fan, the axial flow fan is also a feasible solution.

[0044] See also Figures 1 to 8 As shown, a first control device 6 and a second control device 7 are also installed in the shell 1. The first control device 6 is communicatively connected with the second control device 7. The first control device 6 and the first auxiliary fan 4 are located on the first side of the shell 1, and the second control device 7 and the second auxiliary fan 5 are located on the second side of the shell 1.

[0045] In this technical solution, after the first auxiliary fan 4 and the second auxiliary fan 5 are added to the shell 1, the volume of the indoor unit has increased, and the addition of two auxiliary fans also increases the volume of the control device of the indoor unit. If the control device is still an integral piece, the volume of the shell 1 needs to be expanded to accommodate the control device, which will further increase the volume of the indoor unit. However, the present application divides the control device into two parts, namely, the first control device 6 and the second control device 7, so that the two smaller spaces on the side of the first auxiliary fan 4 and the second auxiliary fan 5 in the shell 1 can be used to place the first control device 6 and the second control device 7, thereby avoiding further increase in the volume of the indoor unit. At the same time, the two control devices can parse the data from the three fan systems and implement precise control. The three fan systems can also operate independently without interfering with each other. This feature makes the air conditioner more flexible and changeable during use. For example, when the user only needs to supply air to a specific area on the left side of the indoor unit, the first auxiliary fan 4 system on the left can be selected to operate independently. When the user needs pure cold air or hot air, the main fan 2 system can be selected to operate independently, thereby achieving precise air supply and improving comfort. This design not only improves the efficiency of the air conditioner, but also reduces energy waste to a certain extent. When full cooling or heating is not required, some fan systems can be selected to work, thereby reducing unnecessary energy consumption and achieving energy-saving effects. Since each fan system can be controlled independently, a low-noise fan system can be selected to work at night or in other environments that require quietness, thereby reducing noise interference. Furthermore, by reasonably allocating the use time of each fan system, the workload of each component can be balanced, thereby extending the overall service life of the air conditioner.

[0046] See also Figures 1 to 8 As shown, the first control device 6 is located above the first auxiliary fan 4, and the second control device 7 is located above the second auxiliary fan 5. This design makes the first control device 6 and the second control device 7 away from the indoor heat exchanger 3 and located above the indoor heat exchanger 3, effectively preventing condensed water from invading the control device, enhancing the safety and reliability of the circuit, and achieving a double leap in the performance and safety of the indoor unit.

[0047] See also Figures 1 to 4 As shown, as the first embodiment, the main fan 2 is a cross-flow fan.

[0048] In this embodiment, the crossflow fan is usually designed to be relatively long along the axial direction, so the crossflow fan has the characteristic of a wide air supply range. When the main fan 2 is a crossflow fan, it helps to make the air outlet of each position of the air outlet of the indoor unit uniform. It should be noted that when the main fan 2 is a crossflow fan, the indoor heat exchanger 3 is an arched structure that bulges toward the main air inlet, which can increase the contact area between the airflow driven by the crossflow fan and the indoor heat exchanger 3, thereby improving the heat exchange effect.

[0049] See also Figures 5 to 8 As shown, as embodiment 2, the main fan 2 is a centrifugal fan, and the indoor heat exchanger 3 includes a first heat exchange section, which is inclined relative to the main fan 2, and the distance between the first heat exchange section and the main fan 2 gradually increases in the direction from the main air inlet to the air outlet.

[0050] In this technical solution, since the centrifugal fan has the characteristics of axial air inlet and radial air outlet, when the main fan 2 is a centrifugal fan and the distance between the first heat exchange section and the main fan 2 gradually increases in the direction from the main air inlet to the air outlet, it is possible to ensure that the airflow driven by the centrifugal fan has a larger heat exchange area with the first heat exchange section, thereby ensuring the heat exchange effect. Preferably, the axis of the centrifugal fan is perpendicular to the center line of the main air inlet.

[0051] It should be noted that, compared with the solution in which the main fans 2 are cross-flow fans, the solution in which there are two main fans 2 and both are centrifugal fans has a smaller air volume at the middle part of the air outlet but a longer air supply distance.

[0052] See also Figures 5 to 8 As shown, there are two main fans 2, and the two main fans 2 are spaced apart along the length direction of the shell 1. The indoor heat exchanger 3 includes two first heat exchange sections, and the two first heat exchange sections are inclined relative to the two main fans 2, and the distance between the two first heat exchange sections and the two main fans 2 gradually increases in the direction from the main air inlet to the air outlet.

[0053] In this embodiment, when the main fan 2 is a centrifugal fan, by setting the number of the main fans 2 to two, the indoor heat exchanger 3 also includes two first heat exchange sections, which can ensure that the two main fans 2 are fully heat exchanged with the two first heat exchange sections respectively, and can also ensure that the indoor unit performs uniform and balanced air supply. Preferably, the two main fans 2 are symmetrically distributed in the housing 1, and the two first heat exchange sections are also symmetrically distributed in the housing.

[0054] It should be noted that, when the main fan 2 is a centrifugal fan and the shape of the indoor heat exchanger 3 is adjusted accordingly, a guide plate is also provided in the shell 1. The guide plate is consistent with the inclination direction of the first heat exchange section and extends into the water receiving tray 13. The guide plate is used to guide the condensed water generated by the inclined first heat exchange section to the water receiving tray 13. A drain outlet 14 is provided at the bottom of the water receiving tray 13.

[0055] The present invention also provides an air conditioner, comprising the aforementioned indoor unit.

[0056] The present invention also provides a control method for an air conditioner, which is used to control the operation of the aforementioned air conditioner, wherein the air conditioner further comprises a compressor, and the control method comprises: when the air conditioner operates in a cooling mode and the compressor operates at a set frequency or stops operating, obtaining an indoor temperature and recording it as T1, obtaining a pipe wall temperature of an indoor heat exchanger 3 and recording it as T2, and when T2>T1-T a When the main fan 2 is controlled to run at the set speed, the first auxiliary fan 4 is controlled to run; wherein, T a Set the temperature to the first level.

[0057] In this technical solution, T a is 5°C; after the air conditioner reaches the specified cooling capacity, the compressor runs at the set frequency, that is, the compressor runs at low frequency, and the main fan 2 runs at the set speed, that is, the main fan 2 runs at low speed. When the compressor runs at low frequency or stops running, if it is detected that the difference between the pipe wall temperature of the indoor heat exchanger 3 and the indoor temperature is within 5°C, it means that the pipe wall temperature of the indoor heat exchanger 3 is high, and the air outlet of the indoor unit is very likely to produce odor, so the first auxiliary fan 4 is controlled to run to dilute the odor of the air outlet. Of course, in order to further dilute the odor, the second auxiliary fan 5 can also be controlled to run.

[0058] Fig. 9 is a control flow chart of an air conditioner according to an embodiment of the present invention. Fig. 9 In the figure, the indoor unit pipeline temperature is the tube wall temperature of the indoor heat exchanger 3; the ambient temperature is the indoor temperature; the middle crossflow fan blade is the main fan 2; the centrifugal fans on both sides are the first auxiliary fan 4 and the second auxiliary fan 5; the mixed air supply mode means that the first auxiliary fan 4 and / or the second auxiliary fan 5 are also running while the main fan 2 is running; the single cooling mode means that only the main fan 2 is running in the cooling mode.

[0059] It is easy for those skilled in the art to understand that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0060] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An indoor unit, characterized in that: include: A shell (1), a main fan (2), an indoor heat exchanger (3) and a first auxiliary fan (4); the shell (1) is formed with a main air inlet, a first auxiliary air inlet and an air outlet; the main fan (2), the indoor heat exchanger (3) and the first auxiliary fan (4) are all installed in the shell (1); the indoor heat exchanger (3) is located between the air inlet side of the main fan (2) and the main air inlet; the first auxiliary air inlet is located on the air inlet side of the first auxiliary fan (4); and the air outlet is located on the air outlet side of the first auxiliary fan (4).

2. The indoor unit according to claim 1, characterized in that: The first auxiliary fan (4) is a centrifugal fan, the first auxiliary fan (4) and the first auxiliary air inlet are both located on the first side of the main fan (2), and the first auxiliary fan (4) is located between the first side of the main fan (2) and the first auxiliary air inlet.

3. The indoor unit according to claim 1, characterized in that: A second auxiliary fan (5) is also installed in the shell (1), and a second auxiliary air inlet is also formed on the shell (1), the second auxiliary air inlet is located on the air inlet side of the second auxiliary fan (5), and the air outlet is located on the air outlet side of the second auxiliary fan (5).

4. The indoor unit according to claim 3, characterized in that: The second auxiliary fan (5) is a centrifugal fan, the second auxiliary fan (5) and the second auxiliary air inlet are both located on the second side of the main fan (2), and the second auxiliary fan (5) is located between the second side of the main fan (2) and the second auxiliary air inlet.

5. The indoor unit according to claim 3, characterized in that: A first control device (6) and a second control device (7) are also installed in the shell (1); the first control device (6) is communicatively connected with the second control device (7); the first control device (6) and the first auxiliary fan (4) are located on a first side in the shell (1); and the second control device (7) and the second auxiliary fan (5) are located on a second side in the shell (1).

6. The indoor unit according to any one of claims 1 to 5, characterized in that: The main fan (2) is a cross-flow fan; and / or the first control device (6) is located above the first auxiliary fan (4), and the second control device (7) is located above the second auxiliary fan (5).

7. The indoor unit according to any one of claims 1 to 5, characterized in that: The main fan (2) is a centrifugal fan, and the indoor heat exchanger (3) comprises a first heat exchange section, the first heat exchange section is arranged obliquely relative to the main fan (2), and the distance between the first heat exchange section and the main fan (2) gradually increases in the direction from the main air inlet to the air outlet.

8. The indoor unit according to claim 7, characterized in that: The number of the main fans (2) is two, and the two main fans (2) are spaced apart along the length direction of the shell (1); the indoor heat exchanger (3) comprises two first heat exchange sections, and the two first heat exchange sections are arranged obliquely relative to the two main fans (2), and in the direction from the main air inlet to the air outlet, the distance between the two first heat exchange sections and the two main fans (2) gradually increases.

9. An air conditioner, characterized in that: The indoor unit comprises the indoor unit according to any one of claims 1 to 8.

10. A method for controlling an air conditioner, characterized in that: Used to control the operation of the air conditioner according to claim 9, the air conditioner further comprising a compressor, the control method comprising: when the air conditioner is operating in a cooling mode and the compressor is operating at a set frequency or stops operating, obtaining the indoor temperature and recording it as T1, obtaining the pipe wall temperature of the indoor heat exchanger (3) and recording it as T2, and when T2>T1-T a When the main fan (2) is controlled to run at a set speed, the first auxiliary fan (4) is controlled to run; wherein T a Set the temperature to the first level.

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