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

Abstract

The present invention discloses an indoor unit structure, a control method for the indoor unit structure, and an air conditioner. The indoor unit structure includes a control module, an indoor unit housing, a main air duct, an air inlet, a heat exchanger, a fan, and an air outlet sequentially arranged along the main air duct, a heating component disposed within the main air duct, and a bypass air inlet connected to the portion of the main air duct located between the heat exchanger and the fan. In defrost mode, the control module closes the air outlet of the heat exchanger, opens the bypass air inlet, and activates the heating component to achieve continuous heating during defrost. This invention maintains the original piping design of the air conditioner and achieves continuous heating during defrost, thereby improving user comfort.

Description

Technical Field

[0001] The present invention relates to the technical field of air-conditioning indoor units, and in particular to an indoor unit structure capable of continuously heating during defrosting. Background Art

[0002] When the outdoor temperature and humidity reach certain levels during winter heating, the air conditioner begins to frost. This reduces the efficiency of the system's heat exchanger and increases power consumption. As frost accumulates, the unit must be defrosted.

[0003] The existing defrost solution is to switch the direction of the four-way valve, with the outdoor machine heating and the indoor machine cooling. During defrosting, heat cannot be provided to the room and continuous heating cannot be achieved. Therefore, the air conditioner in the existing technology has the disadvantage of not being able to continuously heat in defrost mode.

[0004] Furthermore, cooling the indoor unit causes the indoor temperature to drop. To prevent a sudden drop in indoor temperature that affects comfort, traditional indoor units shut down their fans during defrosting. The heat exchanger absorbs heat from the indoor air through radiation, resulting in low heat exchange efficiency, long defrosting duration, and a rapid drop in indoor temperature, all of which affect user comfort.

[0005] In order to enable the air conditioner to achieve continuous heating in defrost mode, most of the existing technologies for continuous heating use heat storage modules. The heat required for outdoor unit defrosting and indoor unit heating must be provided by the heat storage module. However, adding a heat storage module will result in a large unit size and high cost, which cannot be fully promoted.

[0006] Therefore, how to provide an indoor unit structure that can continuously heat during defrosting is a technical problem that the industry needs to solve. Summary of the Invention

[0007] In order to solve the technical problems of large volume and high cost caused by achieving continuous heating through a heat storage module during defrosting of an air conditioner in the prior art, the present invention proposes an indoor unit structure, a control method for the indoor unit structure, and an air conditioner.

[0008] The indoor unit structure proposed in the present invention includes a control module, an indoor unit housing, a main air duct, an air inlet, a heat exchanger, a fan, and an air outlet arranged in sequence along the main air duct, a heating component arranged in the main air duct, and a bypass air inlet connected to the portion of the main air duct located between the heat exchanger and the fan;

[0009] In the defrost mode, the control module closes the air outlet of the heat exchanger, opens the bypass air inlet, and turns on the heating component to achieve continuous heating during defrosting.

[0010] Furthermore, the heating component is arranged between the heat exchanger and the fan, and the bypass air inlet is connected to a portion of the main air duct located between the heat exchanger and the heating component.

[0011] Furthermore, the heating component is arranged at the air outlet.

[0012] Furthermore, it also includes an air inlet baffle hinged between the heat exchanger and the bypass air inlet, and the control module controls the rotation of the air inlet baffle so that the opening and closing states of the air outlet end of the heat exchanger and the bypass air inlet are opposite.

[0013] Furthermore, it also includes an outer shell arranged outside the indoor unit shell, the outer shell is provided with a return air port and a supply air port, an external air duct connecting the return air port with the air inlet and the bypass air inlet, and an air supply duct connecting the air outlet and the supply air port is provided between the outer shell and the indoor unit shell.

[0014] Furthermore, the outer shell is formed by the wall and ceiling of the building where the indoor unit casing is installed.

[0015] Furthermore, the air outlet includes a lower air outlet and a horizontal air outlet, and the air supply outlet includes a lower air supply outlet and a horizontal air supply outlet.

[0016] Furthermore, it also includes a first baffle for opening or closing the lower air outlet, and / or a second baffle for opening or closing the horizontal air outlet.

[0017] Furthermore, it also includes a bypass air outlet, which is connected to the external air duct and is connected to the part of the main air duct located between the fan and the horizontal air outlet.

[0018] Furthermore, the second baffle is hinged between the bypass air outlet and the horizontal air outlet, and the control module controls the second baffle to rotate so that the opening and closing states of the horizontal air outlet and the bypass air outlet are opposite.

[0019] Furthermore, the first baffle is hinged between the horizontal air outlet and the lower air outlet, and the control module controls the first baffle to rotate so that the opening and closing states of the horizontal air outlet and the lower air outlet are opposite.

[0020] Further, when the heating component is arranged at the air outlet, the heating component is arranged at the lower air outlet.

[0021] Furthermore, the control module is arranged in the indoor unit casing, or in the outdoor unit casing.

[0022] When the air outlet in the above technical solution includes a lower air outlet and a horizontal air outlet, the control method of the indoor unit structure proposed in the present invention controls the heating component to turn on, and opens the bypass air inlet and the lower air outlet, and closes the air outlet end, bypass air outlet and horizontal air outlet of the heat exchanger in the defrosting and continuous heating mode.

[0023] Furthermore, when the heating component is arranged between the heat exchanger and the fan, the air conditioner has a rapid defrost mode, and in the rapid defrost mode, the heating component is controlled to turn on, the air outlet end and the bypass air outlet of the heat exchanger are opened, and the bypass air inlet, the lower air outlet and the horizontal air outlet are closed.

[0024] Furthermore, in the heating mode, the heating component is controlled to be turned on or off, the air outlet end and the lower air outlet of the heat exchanger are opened, and the bypass air inlet, the horizontal air outlet and the bypass air outlet are closed.

[0025] Furthermore, in cooling mode, the heating component is controlled to be closed, the air outlet end and the horizontal air outlet of the heat exchanger are opened, and the bypass air inlet, the lower air outlet and the bypass air outlet are closed.

[0026] The air conditioner proposed by the present invention adopts the indoor unit structure described in the above technical solution.

[0027] Without changing the original piping design of the air conditioner, the present invention utilizes the existing unit configuration, adds heating components, and improves the structure of the indoor unit, thereby achieving continuous heating while the unit defrosts, thereby improving user comfort. The present invention utilizes the outer shell and the corresponding bypass air inlet and bypass air outlet on the indoor unit housing to achieve other operating modes besides heating and cooling, enriching the functions of the air conditioner. In addition, the present invention realizes the switching of the opening and closing states of different air inlets and the switching of the opening and closing states of different air outlets by providing multiple rotatable baffles. For example, the present invention has five air inlets and outlets, and only uses three baffles, which saves the number of controlled components and simplifies the control logic. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The present invention is described in detail below with reference to the embodiments and accompanying drawings, in which:

[0029] Figure 1 It is a structural diagram of an embodiment of the present invention.

[0030] Figure 2 This is an air flow diagram for defrosting and continuous heating according to an embodiment of the present invention.

[0031] Figure 3 This is a quick defrosting air flow diagram of an embodiment of the present invention.

[0032] Figure 4 FIG. 1 is an air flow diagram of the heating air outlet according to an embodiment of the present invention.

[0033] Figure 5 This is a diagram of the cooling upper air flow direction of an embodiment of the present invention.

[0034] Figure 6 It is a structural diagram of another embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1. Indoor unit housing; 2. Air inlet; 3. Heat exchanger; 4. Fan; 5. Lower air outlet; 6. Horizontal air outlet; 7. Heating element; 8. Duct volute; 9. Bypass air inlet; 10. Bypass air outlet; 11. Air inlet baffle; 12. First baffle; 13. Second baffle; 14. Vertical baffle; 15. Return air outlet; 16. Through hole; 17. Drain tray; 18. Ceiling. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] Thus, a feature indicated in this specification is intended to illustrate one of the features of one embodiment of the present invention, rather than to imply that every embodiment of the present invention must have the described feature. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other, not explicitly described, combinations. Thus, unless otherwise noted, the described combinations are not intended to be limiting.

[0039] The indoor unit structure of the present invention includes a control module, an indoor unit housing 1, a main air duct, and an air inlet 2, a heat exchanger 3, a fan 4, and an air outlet sequentially arranged along the main air duct.

[0040] In addition to the above structure, the present invention further includes a heating element 7 in the main air duct and a bypass air inlet 9 in the portion of the main air duct between the heat exchanger 3 and the fan 4. The heating element 7 can be arranged along the direction of the airflow and can be placed at any position in the main air duct.

[0041] When the air conditioner is in defrost mode, the control module closes the air outlet of the heat exchanger 3, opens the bypass air inlet 9, and turns on the heating component 7, so that the air does not pass through the heat exchanger 3 of the indoor unit, but enters directly from the bypass air inlet 9, is heated by the heating component 7, and is then transmitted out from the air outlet through the fan 4, thereby realizing the continuous heating function of the air conditioner during defrost, improving the user's comfort, and the pipeline setting configuration of the unit itself does not need to be changed, and the implementation cost is low. It avoids the problem of indoor temperature drop caused by the cooling of the heat exchanger 3 of the indoor unit during the defrost process, and also avoids the problem of excessive unit size caused by the use of energy storage modules in the prior art.

[0042] The control module in the above technical solution can be a controller for independent use of the indoor unit, etc., which is arranged in the indoor unit housing 1. The control module can also be a controller for the outdoor unit, which is arranged in the housing of the outdoor unit. The indoor unit and the outdoor unit share the same controller through a communication line.

[0043] In one embodiment, the heating element 7 is specifically disposed between the heat exchanger 3 and the fan 4. Specifically, there is a distance between the heat exchanger 3 and the heating element 7, and the heating element 7 is closer to the fan 4, thereby reducing heat loss when continuous heating is achieved through the heating element 7. The bypass air inlet 9 is specifically connected to the portion of the main air duct located between the heat exchanger 3 and the heating element 7. When the air outlet is divided into a lower air outlet 5 and a horizontal air outlet 6, the placement of the heating element 7 between the heat exchanger 3 and the fan 4 will increase air resistance during cooling, but can achieve rapid defrosting during defrosting. The specific control of the baffle and the air flow direction will be described in detail in the control method of the indoor unit.

[0044] In another embodiment, the heating element 7 can also be arranged at the air outlet. When the air outlet is divided into a lower air outlet 5 and a horizontal air outlet 6, the heating element 7 is usually arranged at the lower air outlet. During cooling, the airflow comes out from the horizontal air outlet 6, achieving continuous heating during defrosting without increasing wind resistance during cooling. However, rapid defrosting cannot be achieved.

[0045] In a specific embodiment, the present invention uses an air inlet 2 baffle to achieve the opposite opening and closing states of the air outlet of the heat exchanger 3 and the bypass air inlet 9. The air inlet 2 baffle is hinged between the heat exchanger 3 and the bypass air inlet 9, and the air inlet 2 baffle can be controlled to rotate by the control module so that the air outlet of the heat exchanger 3 and the bypass air inlet 9 have opposite opening and closing states. The same baffle can be used to switch the opening and closing states of the two air inlets 2, saving the number of controlled components and simplifying the control logic. In other embodiments, different baffles can also be used. The specific movement form of the baffle can be a rotational form or a translational form. Different baffles are used to control the opening and closing states of the air outlet of the heat exchanger 3 and the bypass air inlet 9 respectively. Regardless of which specific implementation method is used, the control principle is the same, that is, the opening and closing states of the air outlet of the heat exchanger 3 and the bypass air inlet 9 are opposite.

[0046] In one embodiment, an outer shell is disposed outside the indoor unit housing 1. The outer shell is provided with a return air port 15 and a supply air port. An external air duct is provided between the outer shell and the indoor unit housing 1. For example, the external air duct can be formed by the gap between the outer shell and the indoor unit housing 1. The external air duct not only connects the return air port 15 with the air inlet 2, but also connects the return air port 15 with the bypass air inlet 9. An air supply duct is also provided inside the outer shell, connecting the air outlet and the air supply port.

[0047] In a specific embodiment, the outer shell can be formed by the wall and ceiling 18 of the building where the indoor unit housing 1 is installed, which simplifies the structure of the indoor unit itself.

[0048] In a preferred embodiment, the air outlet includes a lower air outlet 5 and a horizontal air outlet 6, and the air supply outlet includes a lower air supply outlet and a horizontal air supply outlet, that is, the air supply duct includes the air supply duct between the lower air outlet 5 and the lower air supply outlet, and the air supply duct between the horizontal air outlet 6 and the horizontal air supply outlet. By arranging the return air outlet 15 and the horizontal air outlet 6 on the front side of the indoor unit, and arranging the lower air outlet 5 on the lower side, a series of continuous heating air conditioners of "front return air-upper and lower air outlet" is realized. All return air of the air conditioner enters from the front of the indoor unit, and the lower air outlet 5 for heating air outlet is below. The cooling is horizontal air outlet because cold air sinks quickly, and the heating is because hot air floats easily. If it is directly discharged horizontally, the temperature of the space will rise slowly, which improves the industry difficulty of "heating but not heating".

[0049] In one embodiment, the indoor unit structure also includes a first baffle 12 and / or a second baffle 13. The first baffle 12 is used to open or close the lower air outlet 5, and the second baffle 13 is used to open or close the horizontal air outlet 6. The opening and closing states of the two air inlets can be switched by a baffle, and the structure is very compact.

[0050] In one embodiment, the indoor unit structure also includes a bypass air outlet 10, one side of the bypass air outlet 10 is connected to the external air duct, and the other side is connected to the part of the main air duct located between the fan 4 and the horizontal air outlet 6. The bypass air outlet 10 is one of the necessary components for realizing the rapid defrost mode.

[0051] In a preferred embodiment, a second baffle 13 is hinged between the bypass air outlet 10 and the horizontal air outlet 6. The control module controls the rotation of the second baffle 13 to reverse the opening and closing states of the horizontal air outlet 6 and the bypass air outlet 10. A single baffle can switch the opening and closing states of the two air outlets, resulting in a very compact structure.

[0052] In a preferred embodiment, a first baffle 12 is hinged between the horizontal air outlet 6 and the lower air outlet 5. The control module controls the rotation of the first baffle 12 to reverse the opening and closing states of the horizontal air outlet 6 and the lower air outlet 5. Here, too, a single baffle can be used to switch the opening and closing states of the two air outlets, making the overall structure of the indoor unit very compact.

[0053] In the above embodiment, if the heating component 7 is provided at the air outlet, the heating component 7 can be provided at the lower air outlet 5. This arrangement can reduce the wind resistance of the indoor unit when the air conditioner is cooling, and can reduce heat loss when the air conditioner is heating.

[0054] The above embodiments may also be combined with each other to form new embodiments. The present invention will illustrate embodiments formed by partial combination of the above embodiments with reference to the specific embodiments in the drawings.

[0055] Figure 1The figure shows a schematic structural diagram of a specific embodiment of the present invention. In this embodiment, an indoor unit housing 1 is fixed to a wall of a building. An air inlet 2 is provided on the left side of the indoor unit housing 1, and a bypass air inlet 9 is provided on the top side near the air inlet 2. A heat exchanger 3 is provided near the air inlet 2 in the indoor unit housing 1. The air inlet 2 baffle is hingedly connected to the indoor unit housing 1 at the top of the heat exchanger 3, that is, the air inlet 2 baffle is hingedly connected to point O3 in the figure. A heating component 7 is provided in the indoor unit casing 1 on the right side of the bypass air inlet 9, and the top of the heating component 7 is connected to the air duct volute 8. The fan 4 (such as a cross-flow fan 4) is provided in the air duct volute 8. A horizontal air outlet 6 is provided on the right side of the outdoor unit casing. The left side of the air duct volute 8 is located on the right side of the bypass air inlet 9. The right side of the air duct volute 8 extends to the right side of the indoor unit casing 1, that is, the front side of the indoor unit casing 1 facing the user. A lower air outlet 5 is provided on the side of the bottom of the indoor unit casing 1 near the horizontal air outlet 6. The lower air outlet 5 is located below the air duct volute 8. The return air outlet 15 of the outer casing formed by the building and the ceiling 18 is also located on the same side as the horizontal air outlet 6. A bypass return air outlet 15 is provided on the top of the indoor unit near the horizontal air outlet 6 or the return air outlet 15, that is, the corresponding position of the air duct volute 8 and the corresponding position of the top of the indoor unit casing 1 are provided with a through hole, thereby forming a bypass air outlet 10, and the second baffle 13 is hinged at the O2 point between the bypass air outlet 10 and the horizontal air outlet 6, that is, the O2 point between the air duct volute 8 and the horizontal air outlet 6. When the bypass air outlet 10 is closed, the free end of the second baffle 13 is connected to the air duct volute 8, and the horizontal air outlet 6 is opened at this time. When the free end of the second baffle 13 moves to the horizontal air outlet 6 in a vertical state, the horizontal air outlet 6 is closed and the bypass air outlet 10 is opened. The first baffle 12 is hinged at point O1 between the horizontal air outlet 6 and the lower air outlet 5. When the free end of the first baffle 12 is connected to the air duct volute 8, the air connection between the horizontal air outlet 6 and the main air duct is blocked, and the lower air outlet 5 is opened. When the first baffle 12 is connected to the vertical baffle 14 on the left side of the lower air outlet 5, the air connection between the lower air outlet 5 and the main air duct is blocked, and the main air duct is connected to the horizontal air outlet 6.

[0056] The present invention also proposes a control method for the indoor unit structure. Since the specific control method of the air-conditioning indoor unit has been described in the above technical solution when there is only one air outlet, the control method of the indoor unit structure introduced below refers to the indoor unit structure specifically referring to the indoor unit structure with a horizontal air outlet 6 and a lower air outlet 5.

[0057] Based on the above embodiments or a combination thereof, the air conditioner may have at least one of a defrost and continuous heating mode, a rapid defrost mode, a cooling mode, and a heating mode.

[0058] like Figure 2As shown, in the defrost continuous heating mode, it is necessary to control the heating component 7 to be turned on, control the air inlet 2 baffle to rotate to the air outlet end of the heat exchanger 3, open the bypass air inlet 9, and simultaneously close the air inlet 2 and the air outlet end of the heat exchanger 3. Control the first baffle 12 to connect with the air duct volute 8, the connection point is located on the left side of the bypass air outlet 10, which is position A1 in the figure, thereby opening the lower air outlet 5 and blocking the connection between the main air duct and the horizontal air outlet 6 and the bypass air outlet 10. Control the second baffle 13 to close the horizontal air outlet 6, that is, the free end of the second baffle 13 is connected to position B2. Under the action of the fan 4, air enters from the return air inlet 15, passes through the external air duct, enters the bypass air inlet 9, and after being heated by the heat exchange component, blows out from the lower air outlet 5. This achieves the purpose of achieving defrosting of the outdoor unit while the indoor unit can achieve continuous heating.

[0059] like Figure 3 As shown, in the rapid defrost mode, the heating element 7 is disposed between the heat exchanger 3 and the fan 4. Rapid defrost mode requires controlling the heating element 7 to be turned on, controlling the air inlet 2 baffle to rotate to connect to the left side of the air duct volute 8, thereby opening the air outlet of the heat exchanger 3 and the air inlet 2, closing the bypass air inlet 9, controlling the first baffle 12 to connect to the vertical baffle 14 on the left side of the lower air outlet 5, that is, the free end of the first baffle 12 connects to position B1, closing the lower air outlet 5, controlling the second baffle 13 to close the horizontal air outlet 6, thereby opening the bypass air outlet 10. Under the action of the fan 4, air enters the air inlet 2 from the external air duct, exchanges heat through the heat exchanger 3, and then passes through the heating element 7. After being heated by the heating element 7, it exits the bypass air outlet 10 into the external air duct, and then enters the air inlet 2 from the external air duct, realizing internal air circulation within the indoor unit and accelerating the defrost process.

[0060] like Figure 4 As shown, in heating mode, the heating component 7 can be controlled to be turned on or off, and the air inlet 2 baffle is controlled to rotate to connect with the left side of the air duct volute 8, thereby opening the air outlet of the heat exchanger 3 and the air inlet 2, closing the bypass air inlet 9, and controlling the first baffle 12 to connect with the air duct volute 8, with the connection point located on the left side of the bypass air outlet 10, thereby opening the lower air outlet 5 and blocking the connection between the main air duct and the horizontal air outlet 6 and the bypass air outlet 10. The second baffle 13 is controlled to close the horizontal air outlet 6. Under the action of the fan 4, air enters from the return air inlet 15, passes through the external air duct, enters the indoor unit housing 1 from the air inlet 2, is heated by the heat exchanger 3, passes through the fan 4, and is blown out from the lower air outlet 5.

[0061] like Figure 5As shown, in cooling mode, it is necessary to control the heating component 7 to be closed, control the air inlet 2 baffle to rotate to connect with the left side of the air duct volute 8, thereby opening the air outlet end and air inlet 2 of the heat exchanger 3, closing the bypass air inlet 9, control the first baffle 12 to connect with the vertical baffle 14 on the left side of the lower air outlet 5, closing the lower air outlet 5, and control the second baffle 13 to rotate to the air duct volute 8, which is position A2 in the figure, blocking the through hole 16 of the air duct volute 8, thereby closing the bypass air outlet 10 and opening the horizontal air outlet 6. Under the action of the fan 4, air enters from the return air inlet 15, passes through the external air duct, and enters the indoor unit housing 1 from the air inlet 2. After being cooled by the heat exchanger 3, it passes through the fan 4 and is blown out from the horizontal air outlet 6.

[0062] Figure 6 The schematic diagram of another specific embodiment of the present invention shows the structure of an indoor unit housing 1, which is also fixed to the wall of a building. The left side of the indoor unit housing 1 is an air inlet 2, and a bypass air inlet 9 is provided on the top side near the air inlet 2. The air inlet 2 baffle is hingedly connected to the indoor unit housing 1 on top of the heat exchanger 3, that is, the air inlet 2 baffle is hinged at point O3 in the figure. The fan 4 (such as a cross-flow fan 4) is disposed within the air duct volute 8. The right side of the outdoor unit housing is provided with a horizontal air outlet 6. The bottom side of the indoor unit housing 1 is provided with a lower air outlet 5 near the horizontal air outlet 6. The return air outlet 15 of the housing formed by the building and the ceiling 18 is also located on the same side as the horizontal air outlet 6. A bypass return air vent 15 is provided at the top of the indoor unit, near the horizontal air outlet 6 or the return air vent 15. A second baffle 13 is hinged at point O2 between the bypass air outlet 10 and the horizontal air outlet 6. When the bypass air outlet 10 is closed, the free end of the second baffle 13 is connected to the air duct volute 8, and the horizontal air outlet 6 is opened. When the free end of the second baffle 13 moves to the point where the horizontal air outlet 6 is in a vertical position, the horizontal air outlet 6 is closed and the bypass air outlet 10 is opened. A first baffle 12 is hinged at point O1 between the horizontal air outlet 6 and the lower air outlet 5. When the free end of the first baffle 12 is connected to the air duct volute 8, the air connection between the horizontal air outlet 6 and the main air duct is blocked, and the lower air outlet 5 is opened. When the first baffle 12 is connected to the vertical baffle 14 on the left side of the lower air outlet 5, the air connection between the lower air outlet 5 and the main air duct is blocked, and the main air duct is connected to the horizontal air outlet 6. The heating component 7 is arranged at the lower air outlet 5, so that the above-mentioned defrosting continuous heating mode, cooling mode, and heating mode can be realized, but the rapid defrosting mode cannot be realized.

[0063] The air conditioner proposed in the present invention adopts the indoor unit structure of the above-mentioned technical solution. The present invention does not limit the specific type of the controller, nor does it limit the specific shape of the heating element 7. For example, the heating element 7 can adopt the heating element 7 of products such as electric heaters in the prior art.

[0064] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An indoor unit structure, comprising a control module, an indoor unit housing, a main air duct, an air inlet, a heat exchanger, a fan, and an air outlet arranged in sequence along the main air duct, characterized in that: The air outlet includes a lower air outlet and a horizontal air outlet; The indoor unit structure further includes a heating component disposed in the main air duct between the heat exchanger and the fan, and a bypass air inlet connected to a portion of the main air duct between the heat exchanger and the fan; A housing is provided outside the indoor unit housing, the housing is provided with a return air port and an air supply port, an external air duct connecting the return air port with the air inlet and the bypass air inlet, and an air supply duct connecting the air outlet and the air supply port is provided between the housing and the indoor unit housing; a second baffle for opening or closing the horizontal air outlet; the bypass air outlet is connected to the external air duct and to a portion of the main air duct located between the fan and the horizontal air outlet; the second baffle is hinged between the bypass air outlet and the horizontal air outlet, and the control module controls the rotation of the second baffle so that the opening and closing states of the horizontal air outlet and the bypass air outlet are opposite; In the defrost mode, the control module closes the air outlet of the heat exchanger, opens the bypass air inlet, and turns on the heating component to achieve continuous heating during defrosting.

2. The indoor unit structure according to claim 1, characterized in that: The bypass air inlet is connected to a portion of the main air duct located between the heat exchanger and the heating component.

3. The indoor unit structure according to claim 2, characterized in that: It also includes an air inlet baffle hinged between the heat exchanger and the bypass air inlet, and the control module controls the rotation of the air inlet baffle so that the opening and closing states of the air outlet end of the heat exchanger and the bypass air inlet are opposite.

4. The indoor unit structure according to claim 1, characterized in that: The outer shell is formed by the wall and ceiling of the building where the indoor unit casing is installed.

5. The indoor unit structure according to claim 1, characterized in that: The air supply port includes a lower air supply port and a horizontal air supply port.

6. The indoor unit structure according to claim 1, characterized in that: It also includes a first baffle for opening or closing the lower air outlet.

7. The indoor unit structure according to claim 6, characterized in that: The first baffle is hinged between the horizontal air outlet and the lower air outlet, and the control module controls the first baffle to rotate so that the opening and closing states of the horizontal air outlet and the lower air outlet are opposite.

8. The indoor unit structure according to claim 1, wherein: The control module is arranged in the indoor unit casing, or in the outdoor unit casing.

9. A control method for an indoor unit structure according to any one of claims 1, 5 to 7, characterized in that: In the defrosting continuous heating mode, the heating component is controlled to be turned on, and the bypass air inlet and the lower air outlet are opened, and the air outlet end, the bypass air outlet and the horizontal air outlet of the heat exchanger are closed.

10. The control method of the indoor unit structure according to claim 9, characterized in that: When the heating component is arranged between the heat exchanger and the fan, the indoor unit has a rapid defrost mode, and in the rapid defrost mode, the heating component is controlled to turn on, the air outlet end and the bypass air outlet of the heat exchanger are opened, and the bypass air inlet, the lower air outlet and the horizontal air outlet are closed.

11. The control method of the indoor unit structure according to claim 9, characterized in that: In heating mode, the heating component is controlled to be turned on or off, the air outlet end and the lower air outlet of the heat exchanger are opened, and the bypass air inlet, the horizontal air outlet and the bypass air outlet are closed.

12. The control method of the indoor unit structure according to claim 9, characterized in that: In cooling mode, the heating component is controlled to be closed, the air outlet end and the horizontal air outlet of the heat exchanger are opened, and the bypass air inlet, the lower air outlet and the bypass air outlet are closed.

13. An air conditioner, characterized in that: The indoor unit structure according to any one of claims 1 to 8 is adopted.

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