Air conditioner indoor unit, air conditioner and control method

Abstract

The invention provides an air conditioner indoor unit, an air conditioner and a control method.The air conditioner indoor unit comprises an air conditioner shell, an indoor heat exchanger and an auxiliary heater are arranged in the inner space of the air conditioner shell, and an air outlet cavity located on the air outlet side of the indoor heat exchanger is formed in the air conditioner shell; the auxiliary heater is provided with a heating position located in the air outlet cavity and a resistance reduction position located outside the air outlet cavity, and the auxiliary heater can be driven to be switched between the heating position and the resistance reduction position. The auxiliary heater can be driven to move to the resistance reduction position when the air outlet flow does not need to be heated, namely, the auxiliary heater is switched to the outside of the air outlet cavity, the phenomenon that the air outlet flow is hindered due to the fact that the auxiliary heater is located in the air outlet cavity is avoided, the air outlet resistance is reduced, and the air outlet amount is increased; and the heat exchange efficiency of the indoor heat exchanger and the performance of the air conditioner are improved.

Description

Technical Field

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

[0002] In the related art, the electric heater of the air conditioner is generally fixed to other parts of the air conditioner by screws and cannot move. This fixed position electric heater will bring the following shortcomings: (1) The electric heater has different effects on the air flow at the air inlet at different installation positions or installation angles, affecting the performance of the air conditioner. In the air duct system, the electric heater plays the role of an obstacle, and the direct impact is to reduce the air volume of the air conditioner; (2) In the air duct system, the electric heater plays the role of an obstacle, and the air flow will form a vortex phenomenon when flowing through the electric heater. When the air conditioner fan runs at a low speed, it will produce obvious surge phenomenon, affecting the comfort of using the air conditioner.

[0003] The utility model patent with authorization announcement number CN222527784U discloses an air conditioner, which is equipped with an auxiliary heater having a rotation axis, and a first windward surface and a second windward surface are arranged in sequence along the direction surrounding the rotation axis; a drive component is connected to the auxiliary heater to drive the auxiliary heater to rotate and thereby change the windward area of the auxiliary heater, so as to improve the performance of the air conditioner by adjusting the windward area of the auxiliary heater to adapt to its own needs. However, since the auxiliary heater in this technical solution is always in the air outlet cavity of the air conditioner, it forms an air outlet wind resistance when there is no need to heat the outlet air flow, thereby reducing the air outlet air volume. Summary of the Invention

[0004] Therefore, the present invention provides an air conditioner indoor unit, an air conditioner and a control method, which can overcome the technical problem in the related art that the auxiliary heater is always arranged in the air outlet cavity of the air conditioner, forming an obstacle to the air outlet airflow, the air outlet wind resistance is large, and the air outlet air volume of the air conditioner is reduced.

[0005] In order to solve the above problems, the present invention provides an air conditioner indoor unit, including an air conditioner casing, an indoor heat exchanger and an auxiliary heater are provided in the internal space of the air conditioner casing, an air outlet cavity is formed in the air conditioner casing on the air outlet side of the indoor heat exchanger, the auxiliary heater has a heating position in the air outlet cavity and a drag reduction position outside the air outlet cavity, and the auxiliary heater can be driven to switch between the heating position and the drag reduction position.

[0006] In some embodiments, the indoor heat exchanger has a first end face and a second end face located on opposite sides of its heat exchange core, wherein the first end face is the end face of the refrigerant collecting and diverting pipe of the indoor heat exchanger. When the auxiliary heater is in the resistance reduction position, the auxiliary heater is in the area corresponding to the second end face. When the auxiliary heater is in the heating position, the auxiliary heater is in the air outlet side area of the heat exchange core.

[0007] In some embodiments, a driving device is further provided in the air-conditioning housing, and the driving device is used to drive the auxiliary heater to switch between the heating position and the drag reduction position in a translational sliding manner.

[0008] In some embodiments, the air conditioner indoor unit is a vertical indoor unit, and the driving device has two groups, and the two groups of driving devices are respectively connected to the top end and the bottom end of the auxiliary heater.

[0009] In some embodiments, the driving device includes a device assembly frame and a rotary driving member installed on the device assembly frame. The device assembly frame is provided with a slider that can be driven to move back and forth by the rotary driving member. The slider is fixedly connected to the auxiliary heater.

[0010] In some embodiments, the slider is an arc-shaped rack, which is slidably connected to the arc-shaped guide rail on the device assembly frame, and the rotary drive member is a rotary motor, and the driving gear on the output shaft of the rotary motor is engaged with the arc-shaped rack.

[0011] The present invention also provides an air conditioner, comprising the above-mentioned air conditioner indoor unit.

[0012] The present invention also provides a method for controlling the air conditioner as described above, comprising the following steps:

[0013] Get the operating mode of the air conditioner;

[0014] When the operation mode is the heating mode, determining whether the indoor fan is running, and if the indoor fan is running, further determining the magnitude relationship between the rotation speed Vs of the indoor fan and the preset rotation speed Vy;

[0015] If Vs<Vy, controlling the auxiliary heater to be in the drag reduction position;

[0016] If Vs≥Vy, it is further determined whether the indoor fan continuously operates for a time not less than a first set time t1. If so, the auxiliary heater is controlled to be in the heating position; otherwise, the auxiliary heater is controlled to be in the resistance reduction position.

[0017] In some embodiments, when Vs≥Vy, the method further comprises:

[0018] It is further determined whether the following conditions are met: T1 ≥ T2 + Ty1, T2 < Ty2, and T3 < Ty3 is detected for the second set time t2 continuously. If so, the auxiliary heater is controlled to be in the heating position; otherwise, the auxiliary heater is controlled to be in the drag reduction position, wherein T1 is the air conditioner set temperature, T2 is the indoor ambient temperature, T3 is the temperature inside the heat exchange tube of the indoor heat exchanger, Ty1 is the first preset temperature value, Ty2 is the second preset temperature value, and Ty3 is the third preset temperature value.

[0019] In some implementations, when the operating mode is a non-heating mode, the auxiliary heater is controlled to be in the drag reduction position.

[0020] The present invention provides an air conditioner indoor unit, an air conditioner, and a control method thereof, which have the following beneficial effects:

[0021] Since the auxiliary heater has a heating position in the air outlet cavity and a drag reduction position outside the air outlet cavity and can be driven to switch between the heating position and the drag reduction position, the auxiliary heater can be driven to the drag reduction position when there is no need to heat the outlet airflow, that is, the auxiliary heater is switched outside the air outlet cavity, thereby eliminating the obstruction of the outlet airflow caused by the auxiliary heater in the air outlet cavity, reducing the outlet wind resistance, increasing the air volume, and thus improving the heat exchange efficiency of the indoor heat exchanger and the performance of the air conditioner. When the outlet airflow needs to be heated, for example, when the air conditioner is operating in heating mode, the auxiliary heater is controlled to be in the air outlet cavity to achieve auxiliary heating of the outlet airflow, thereby improving the heating performance of the air conditioner and enhancing the user experience.

[0022] When the auxiliary heater is in the drag reduction position, it is specifically driven to move to the area corresponding to the second end face. Since the second end face is the end face on the side where the heat exchange tube adapter elbow of the indoor heat exchanger is located, rather than the end face on the side where the refrigerant collecting and distributing pipes of the indoor heat exchanger are located, there is relatively ample space, which can effectively prevent physical interference between the auxiliary heater and the indoor heat exchanger, and ensure the compact structure of the air conditioner indoor unit.

[0023] The auxiliary heater is driven by a driving device to switch between a heating position and a drag reduction position in a translational sliding manner, which can ensure that the position switching of the auxiliary heater is stable and smooth, and is particularly suitable for situations where the auxiliary heater is large in size and mass;

[0024] In view of the fact that the height of the vertical indoor unit is relatively large and the corresponding indoor heat exchanger is relatively large, the driving devices are configured at the top and bottom of the auxiliary heater at the same time. This can achieve reliable position drive switching of the auxiliary heater with a large mass. At the same time, the synchronous movement of the top and bottom of the auxiliary heater can effectively prevent the auxiliary heater from tilting due to the top or bottom getting stuck during the position switching process.

[0025] The arc-shaped rack is meshed with the driving gear on the output shaft of the rotary motor, so that the rotary motor can translate the auxiliary heater in the circumferential direction of the arc-shaped rack, which can further improve the structural compactness of the air conditioner indoor unit.

[0026] If Vs < Vy, it indicates that the speed of the indoor fan is low. At this time, controlling the auxiliary heater to be in the resistance reduction position can effectively avoid eddy currents and backflows generated in the air outlet cavity by the auxiliary heater, effectively solving the surging problem caused by the low fan speed of the air conditioner.

[0027] If Vs ≥ Vy, it is further determined whether the indoor fan has been running continuously for a time not less than a first set time t1. If so, the auxiliary heater is controlled to be in the heating position; otherwise, the auxiliary heater is controlled to be in the resistance reduction position. This can effectively avoid the auxiliary heater being turned on before the indoor fan is started, resulting in the heat generated by the auxiliary heater not being dissipated in time, causing the temperature in the air outlet cavity to rise suddenly, thereby causing a safety hazard.

[0028] The heat demand of the indoor space is judged by whether the conditions T1≥T2+Ty1, T2<Ty2 and T3<Ty3 are detected for the second set time t2 continuously. When the above conditions are met, it means that the indoor space has a large demand for heat. At this time, the auxiliary heater is controlled to be in the energized state and moved to the heating position to increase the air outlet temperature and improve user comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. The drawings described below are merely exemplary. Those skilled in the art can, without inventive effort, derive other implementation drawings based on the provided drawings.

[0030] Figure 1 Schematic diagram of the internal structure of the indoor unit of the air conditioner in an embodiment of the present invention, wherein components such as the indoor fan are not shown in the figure, and the auxiliary heater in the figure is in the heating position;

[0031] Figure 2 Schematic diagram of the internal structure of the indoor unit of the air conditioner in an embodiment of the present invention. Components such as the indoor fan are not shown in the figure, and the auxiliary heater in the figure is in a drag-reducing position;

[0032] Figure 3 yes Figure 1 A schematic diagram of the three-dimensional structure of the driving device;

[0033] Figure 41 is a schematic diagram of the steps of a method for controlling an air conditioner in an embodiment of the present invention.

[0034] The accompanying drawings are:

[0035] 1. Air conditioner casing;

[0036] 2. Indoor heat exchanger; 201. First end surface; 202. Second end surface; 21. Refrigerant manifold and distribution pipe;

[0037] 3. Auxiliary heater;

[0038] 4. Driving device; 41. Device assembly frame; 42. Rotary driving member; 43. Slider;

[0039] 100. Internal space; 101. Air outlet cavity. DETAILED DESCRIPTION

[0040] The following will be combined with the accompanying 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 embodiments described 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 in no way 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 making creative efforts are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying 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 device or element 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 outline of each component itself.

[0042] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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° or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0043] 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. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0044] See also Figures 1 to 4 As shown, according to an embodiment of the present invention, an air conditioner indoor unit is provided, comprising an air conditioner housing 1, wherein an indoor heat exchanger 2, an indoor fan (not shown in the figure, not labeled, in a specific embodiment, a cross-flow fan) and an auxiliary heater 3 are provided in the internal space 100 of the air conditioner housing 1, wherein the indoor fan is arranged on the air outlet side of the indoor heat exchanger 2, so as to be able to draw the air of the indoor space into the internal space 100 through the air inlet (not shown in the figure, not labeled) of the air conditioner housing 1 and send the air into the indoor space after heat exchange through the indoor heat exchanger 2, thereby achieving indoor air conditioning. To control the temperature of the air in the space, an air outlet cavity 101 is formed in the air-conditioning casing 1 on the air outlet side of the indoor heat exchanger 2. The air outlet cavity 101 is specifically formed by an air supply duct in the internal space 100. The auxiliary heater 3 has a heating position in the air outlet cavity 101 and a drag reduction position outside the air outlet cavity 101. The auxiliary heater 3 can be driven to switch between the heating position and the drag reduction position. The auxiliary heater 3 specifically adopts an electric heater commonly used in the industry (such as a PTC ceramic heater).

[0045] In this technical solution, since the auxiliary heater 3 has a heating position in the air outlet cavity 101 and a drag reduction position outside the air outlet cavity 101 and can be driven to switch between the heating position and the drag reduction position, the auxiliary heater 3 can be driven to the drag reduction position when there is no need to heat the outlet airflow, that is, the auxiliary heater 3 is switched outside the air outlet cavity 101, thereby eliminating the obstruction of the outlet airflow caused by the auxiliary heater 3 in the air outlet cavity 101, reducing the outlet wind resistance, increasing the air volume, and thereby improving the heat exchange efficiency of the indoor heat exchanger 2 and the performance of the air conditioner. When the outlet airflow needs to be heated, for example, when the air conditioner is running in heating mode, the auxiliary heater 3 is controlled to be in the air outlet cavity 101 to achieve auxiliary heating of the outlet airflow, thereby improving the heating performance of the air conditioner and enhancing the user experience.

[0046] In some embodiments, the indoor heat exchanger 2 has a first end face 201 and a second end face 202 on opposite sides of its heat exchange core (not marked in the figure), wherein the first end face 201 is the end face of the refrigerant collecting and distributing pipe 21 of the indoor heat exchanger 2. When the auxiliary heater 3 is in the resistance reduction position, the auxiliary heater 3 is in the area corresponding to the second end face 202, that is, the second end face 202 is the end face on one side where the heat exchange tube adapter elbow of the indoor heat exchanger 2 is located. When the auxiliary heater 3 is in the heating position, the auxiliary heater 3 is in the air outlet side area of the heat exchange core. It should be noted that the area corresponding to the second end face 202 is in the internal space of the air-conditioning casing 1, but it is not the area corresponding to the air outlet side of the heat exchange core, so it will not form an obstacle to the airflow out of the heat exchange core.

[0047] In this technical solution, when the auxiliary heater 3 is in the resistance reduction position, it is specifically driven to move to the area corresponding to the second end face 202. Since the second end face 202 is the side end face where the heat exchange tube adapter elbow of the indoor heat exchanger 2 is located rather than the side end face where the refrigerant collecting and diverting pipe 21 of the indoor heat exchanger 2 is located, the space is relatively ample, which can effectively prevent physical interference between the auxiliary heater 3 and the indoor heat exchanger 2, and can ensure the compactness of the structure of the air conditioner indoor unit.

[0048] In some embodiments, a driving device 4 is further provided in the air-conditioning housing 1 , and the driving device 4 is used to drive the auxiliary heater 3 to switch between the heating position and the drag reduction position in a translational sliding manner.

[0049] In this technical solution, the auxiliary heater 3 is driven by the driving device 4 to switch between the heating position and the drag reduction position in a translational sliding manner, which can ensure that the position switching of the auxiliary heater 3 is smooth and stable, and is particularly suitable for situations where the auxiliary heater 3 is large in size and mass.

[0050] See Figure 1 and Figure 2 As shown, in some embodiments, the air conditioner indoor unit is a vertical indoor unit (also called a cabinet unit), the height of the auxiliary heater 3 is roughly equal to the height of the indoor heat exchanger 2 (can be equal), and the driving device 4 has two groups, and the two groups of driving devices 4 are respectively connected to the top and bottom ends of the auxiliary heater 3.

[0051] In this technical solution, in view of the fact that the height of the indoor heat exchanger 2 is relatively large due to the large height of the vertical indoor unit, a driving device 4 is configured at the top and bottom ends of the auxiliary heater 3 at the same time, which can realize reliable position drive switching of the auxiliary heater 3 with a large mass. At the same time, the synchronous movement of the top and bottom ends of the auxiliary heater 3 can also effectively prevent the auxiliary heater 3 from tilting due to getting stuck at the top or bottom end during the position switching process.

[0052] In a specific embodiment, see Figure 3 As shown, the driving device 4 includes a device assembly frame 41 and a rotary driving member 42 installed on the device assembly frame 41. A slider 43 that can be driven to and fro by the rotary driving member 42 is provided in the device assembly frame 41. The slider 43 is fixedly connected to the auxiliary heater 3. Furthermore, the slider 43 is an arc-shaped rack, which is slidably connected to the arc-shaped guide rail (not shown in the figure and not labeled) on the device assembly frame 41. The rotary driving member 42 is a rotary motor (capable of forward and reverse rotation), and a driving gear (not shown in the figure) on the output shaft of the rotary motor is engaged with the arc-shaped rack.

[0053] In this technical solution, the arc-shaped rack is meshed with the driving gear on the output shaft of the rotary motor, so that the rotary motor can translate the auxiliary heater 3 in the circumferential direction of the arc-shaped rack, which can further improve the structural compactness of the air conditioner indoor unit.

[0054] According to an embodiment of the present invention, an air conditioner is also provided, including the above-mentioned air conditioner indoor unit. Since the auxiliary heater 3 has a heating position in the air outlet cavity 101 and a drag reduction position outside the air outlet cavity 101 and can be driven to switch between the heating position and the drag reduction position, the auxiliary heater 3 can be driven to the drag reduction position when there is no need to heat the outlet airflow, that is, the auxiliary heater 3 is switched outside the air outlet cavity 101, thereby eliminating the obstruction of the outlet airflow due to the auxiliary heater 3 in the air outlet cavity 101, reducing the outlet wind resistance, increasing the air volume, and thereby improving the heat exchange efficiency of the indoor heat exchanger 2 and the performance of the air conditioner. When the outlet airflow needs to be heated, for example, when the air conditioner is running in heating mode, the auxiliary heater 3 is controlled to be in the air outlet cavity 101 to achieve auxiliary heating of the outlet airflow, thereby improving the heating performance of the air conditioner and enhancing the user experience.

[0055] According to an embodiment of the present invention, there is also provided a method for controlling the air conditioner as described above, comprising the following steps:

[0056] Acquire an operating mode of the air conditioner, where the operating mode includes a heating mode and a non-heating mode, where the non-heating mode is, for example, one of a cooling mode, a ventilation mode, and a dehumidification mode;

[0057] When the operation mode is the heating mode, determining whether the indoor fan is running, and if the indoor fan is running, further determining the magnitude relationship between the rotation speed Vs of the indoor fan and the preset rotation speed Vy;

[0058] If Vs<Vy, it indicates that the speed of the indoor fan is low. In this case, the auxiliary heater 3 is controlled to be in the resistance reduction position, which can effectively avoid the eddy current and backflow generated by the auxiliary heater 3 in the air outlet cavity 101, and effectively solve the surging problem caused by the low speed of the air conditioner fan.

[0059] If Vs≥Vy, it is further determined whether the indoor fan has been running continuously for a time not less than a first set time t1 (in a specific embodiment, it can be 60s). If so, the auxiliary heater 3 is controlled to be in the heating position, otherwise the auxiliary heater 3 is controlled to be in the resistance reduction position. This can effectively avoid turning on the auxiliary heater 3 before the indoor fan is started, resulting in the heat generated by the auxiliary heater 3 not being dissipated in time, causing the temperature in the air outlet cavity 101 to rise sharply, thereby causing safety hazards.

[0060] In some embodiments, when Vs≥Vy, it also includes: further judging whether the following conditions are met: T1≥T2+Ty1, T2<Ty2 and T3<Ty3 is detected for the second set time t2 continuously (indicating that the heat exchange capacity of the indoor heat exchanger 2 is insufficient at this time); if so, it indicates that the heat demand at this time is large, and the auxiliary heater 3 is controlled to be in the heating position; otherwise, the auxiliary heater 3 is controlled to be in the resistance reduction position, wherein T1 is the air conditioner set temperature, T2 is the indoor ambient temperature, T3 is the tube temperature inside the heat exchange tube of the indoor heat exchanger 2, Ty1 is the first preset temperature value, Ty2 is the second preset temperature value, and Ty3 is the third preset temperature value. In a specific embodiment, Ty1 is 4°C, Ty2 is 25°C, Ty3 is 45°C, and t2 is 180s. That is, when Vs≥Vy and the indoor fan has been running continuously for no less than the first set time t1, it is further detected whether the above conditions are met, and when the above conditions are met, the auxiliary heater 3 is controlled to be in the heating position. Otherwise, it means that no heating is required. At this time, although the heating mode is running, the auxiliary heater 3 is controlled to be in the resistance reduction position to ensure the air output in the heating mode.

[0061] In this technical solution, the heat demand of the indoor space is judged by whether the conditions T1≥T2+Ty1, T2<Ty2 and T3<Ty3 are detected for the second set time t2 continuously. When the above conditions are met, it means that the indoor space has a large demand for heat. At this time, the auxiliary heater 3 is controlled to be in the energized state and moved to the heating position to increase the air outlet temperature and improve the user's comfort.

[0062] In some embodiments, when the operating mode is a non-heating mode, the auxiliary heater 3 is controlled to be in the resistance reduction position, that is, when the air conditioner operates in a cooling mode, a ventilation mode or a dehumidification mode, the auxiliary heater 3 is placed outside the air outlet cavity 101 to prevent it from causing wind resistance in the air outlet cavity 101, thereby ensuring the air output of the air conditioner, improving heat exchange efficiency, reducing energy consumption, and improving energy utilization.

[0063] It is easy for those skilled in the art to understand that, under the premise of no conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0064] The above description is merely 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 shall be included within the scope of protection of the present invention. The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. An air conditioner indoor unit, characterized in that: The invention comprises an air conditioner housing (1), wherein an indoor heat exchanger (2) and an auxiliary heater (3) are arranged in an internal space (100) of the air conditioner housing (1), an air outlet cavity (101) located on the air outlet side of the indoor heat exchanger (2) is formed in the air conditioner housing (1), and the auxiliary heater (3) has a heating position located in the air outlet cavity (101) and a drag reduction position located outside the air outlet cavity (101), and the auxiliary heater (3) can be driven to switch between the heating position and the drag reduction position.

2. The air conditioner indoor unit according to claim 1, characterized in that: The indoor heat exchanger (2) has a first end face (201) and a second end face (202) located on opposite sides of its heat exchange core, wherein the first end face (201) is the end face where the refrigerant collecting and distributing pipe (21) of the indoor heat exchanger (2) is located; when the auxiliary heater (3) is in the resistance reduction position, the auxiliary heater (3) is located in the area corresponding to the second end face (202); when the auxiliary heater (3) is in the heating position, the auxiliary heater (3) is located in the air outlet side area of the heat exchange core.

3. The air conditioner indoor unit according to claim 2, characterized in that: A driving device (4) is also provided in the air-conditioning housing (1), and the driving device (4) is used to drive the auxiliary heater (3) to switch between the heating position and the drag reduction position in a translational sliding manner.

4. The air conditioner indoor unit according to claim 3, characterized in that: The air conditioner indoor unit is a vertical indoor unit, and the driving device (4) has two groups, and the two groups of driving devices (4) are respectively connected to the top end and the bottom end of the auxiliary heater (3).

5. The air conditioner indoor unit according to claim 4, characterized in that: The driving device (4) comprises a device assembly frame (41) and a rotary driving member (42) mounted on the device assembly frame (41); a slider (43) capable of being driven to and fro by the rotary driving member (42) is provided in the device assembly frame (41); the slider (43) is fixedly connected to the auxiliary heater (3).

6. The air conditioner indoor unit according to claim 5, characterized in that: The slider (43) is an arc-shaped rack, which is slidably connected to the arc-shaped guide rail on the device assembly frame (41); the rotary drive member (42) is a rotary motor, and the driving gear on the output shaft of the rotary motor is meshed with the arc-shaped rack.

7. An air conditioner, characterized in that: The invention comprises the air conditioner indoor unit according to any one of claims 1 to 6.

8. A method for controlling an air conditioner according to claim 7, characterized in that: The steps include: Get the operating mode of the air conditioner; When the operation mode is the heating mode, determining whether the indoor fan is running, and if the indoor fan is running, further determining the magnitude relationship between the rotation speed Vs of the indoor fan and the preset rotation speed Vy; If Vs<Vy, the auxiliary heater (3) is controlled to be in the resistance reduction position; If Vs≥Vy, it is further determined whether the indoor fan continuously operates for a time not less than a first set time t1. If so, the auxiliary heater (3) is controlled to be in the heating position; otherwise, the auxiliary heater (3) is controlled to be in the resistance reduction position.

9. The air conditioner control method according to claim 8, characterized in that: When Vs ≥ Vy, it also includes: It is further determined whether the following conditions are met: T1 ≥ T2 + Ty1, T2 < Ty2, and T3 < Ty3 is detected for a second set time t2 continuously. If so, the auxiliary heater (3) is controlled to be in the heating position; otherwise, the auxiliary heater (3) is controlled to be in the resistance reduction position, wherein T1 is the air conditioner set temperature, T2 is the indoor ambient temperature, T3 is the temperature inside the heat exchange tube of the indoor heat exchanger (2), Ty1 is a first preset temperature value, Ty2 is a second preset temperature value, and Ty3 is a third preset temperature value.

10. The air conditioner control method according to claim 8, characterized in that: When the operating mode is a non-heating mode, the auxiliary heater (3) is controlled to be in the resistance reduction position.

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