Air supply device, air conditioner and control method thereof

Abstract

The application provides an air supply device, an air conditioner and a control method thereof. The air supply device comprises a main air module and a fresh air module; the main air module comprises a main air duct structure and a main air blade, the main air duct structure comprises a first air outlet, the fresh air module comprises a fresh air duct structure and a fresh air blade, and the main air duct structure comprises a first channel between the main air blade and the first air outlet; the fresh air duct structure comprises a fresh air inlet duct; the air supply device comprises a valve arranged between the first channel and the fresh air inlet duct, and the first channel and the fresh air inlet duct are communicated when the valve is opened. The air conditioner comprises the air supply device. The control method comprises the following steps: in a heating mode, if it is confirmed that a preheating fresh air function is started: the fresh air module is controlled to work, the fresh air outlet is controlled to be opened, and the valve is controlled to be in a first open state. The application solves the problem that the experience is affected by the low-temperature fresh air sent in winter without increasing an electric heating device and complicating the structure.

Description

Technical Field

[0001] This invention relates to the field of air conditioning equipment technology, specifically to an air supply device, an air conditioner, and a control method thereof. Background Technology

[0002] A cabinet air conditioner with a fresh air function has an air supply device comprising a main air module and a fresh air module. The main air module includes a main air duct structure and cross-flow fan blades installed within the main air duct structure. The main air duct structure has a main air inlet at the rear and a main air outlet at the front. The axis of the cross-flow fan blades is aligned with the height of the cabinet air conditioner. The main air outlet is an elongated opening along the height direction. The fresh air module is located at the bottom of the cabinet air conditioner and includes a fresh air duct structure and centrifugal fan blades installed within the fresh air duct structure. The inlet of the fresh air duct structure connects to the outside, and the outlet connects to the outside of the main air inlet. The heat exchanger of the air conditioner is located inside the main air inlet. When the main air module and the fresh air module are operating, fresh air is drawn into the fresh air duct structure, then sent to the outside of the main air inlet, and then drawn back into the main air duct structure. After passing through the heat exchanger and the cross-flow fan blades, the fresh air and return air are finally mixed and discharged together from the main air outlet.

[0003] The existing air supply device of this type of cabinet air conditioner has the following problem: the fresh air module cannot operate independently of the main air module to complete the air supply. If the outlet of the fresh air module is set as the fresh air supply outlet, and the air is directly delivered to the room without passing through the heat exchanger of the main air module, then when the outdoor ambient temperature is low in winter, the cold air will be directly delivered into the room, which will affect the user experience. Of course, it is possible to add an electric heating device in the fresh air module, but the electric heating device has low preheating efficiency, high energy consumption and large size, which increases the complexity of the overall structure and is not conducive to compact design. Summary of the Invention

[0004] The primary objective of this invention is to provide an air supply device for use in fresh air conditioning systems, which ensures the independent operation of the fresh air module and solves the problem of low-temperature fresh air affecting the user experience in winter without adding an electric heating device or complicating the structure.

[0005] A second objective of the present invention is to provide an air conditioner equipped with the air supply device of the present invention.

[0006] The third objective of this invention is to provide an air conditioner control method that improves the comfort of fresh air delivery in winter.

[0007] The first objective of this invention is to provide an air supply device comprising a main air module and a fresh air module. The main air module includes a main air duct structure and a main air blade disposed within the main air duct structure. The main air duct structure includes a first air outlet, which serves as the main air supply outlet when the main air module operates in a first mode. The fresh air module includes a fresh air duct structure and a fresh air blade disposed within the fresh air duct structure. The fresh air duct structure includes a fresh air inlet and a fresh air outlet. The main air duct structure includes a first channel connecting the location of the main air blade and the first air outlet. The fresh air duct structure includes a fresh air inlet channel connecting the location of the fresh air inlet and the location of the fresh air blade. The air supply device includes a valve disposed between the first channel and the fresh air inlet channel, which connects the first channel and the fresh air inlet channel when the valve is opened.

[0008] As can be seen from the above solution, the present invention mainly connects the first channel of the main air duct and the fresh air intake duct of the fresh air duct through an openable and closable valve. When the air conditioner is running in winter heating mode (i.e., the first mode) and the fresh air function is activated, the preheating fresh air function can be further activated. At this time, the valve opens at a preset angle, and the preheated airflow drawn into the first channel can be drawn into the fresh air duct through the open valve to mix with the low-temperature fresh air, thereby increasing the temperature of the airflow delivered from the fresh air outlet and solving the problem of low-temperature fresh air affecting the user experience in winter. Moreover, this improvement does not require the addition of an electric heating module in the fresh air module, does not require complicated structure or increase the size of the air conditioner, and is effective in saving energy and will not increase the electricity burden for users.

[0009] A further solution is to have a guide vane on the valve. When the valve is in the open state, a mixing port is formed on one side of the guide vane. The first channel is connected to the fresh air intake channel through the mixing port.

[0010] As can be seen from the above, the oscillation of the air guide plate not only realizes the opening and closing of the valve, but the air guide plate can also be set at a suitable angle to provide better airflow guidance and airflow mixing effect for different functions.

[0011] A further proposed solution is that the first channel includes a connecting port, and the connecting port and the first air outlet are located at opposite ends of the first channel; when the valve is in the first open state, the air guide plate is at a first angle, one side of the mixing port faces the connecting port, and / or, the other side of the mixing port faces the suction side of the fresh air fan blade; when the valve is in the second open state, the air guide plate is at a second angle, one side of the mixing port faces the connecting port, and / or, the other side of the mixing port faces the fresh air inlet.

[0012] As can be seen above, when the valve is in the first open state, the air guide plate is at the first angle. At this time, the warm air entering the first channel from the connecting port can be effectively guided by the air guide plate and flow into the fresh air intake duct. This mode is suitable for use in the preheating fresh air function and the high-temperature sterilization function. When the valve is in the second open state, the air guide plate is at the second angle, which is conducive to the flow of fresh air. Another further option is to have a bend in the first channel, with the valve located on the outside of the bend.

[0013] As can be seen from the above, the valve located on the outside of the turn is opposite to both sides of the first channel (the connecting port and the first air outlet). Regardless of how the airflow needs to be mixed, this position is more conducive to the airflow entering and exiting through the valve.

[0014] Another further option is that the main air module includes a volute and a first air duct component, with the air outlet of the volute connected to one end of the first air duct component, and the other end of the first air duct component connected to the first air outlet; the valve is installed on the wall panel of the first air duct component.

[0015] As can be seen from the above, generally, after the airflow is sent out from the volute, it needs to pass through a duct component to guide the airflow before it is sent out to achieve a better air delivery effect. The wall panel of the first duct component is exactly opposite to the fresh air duct, so it is more appropriate to install a valve on the wall panel of the first duct component.

[0016] Another further solution is that when the main air module operates in the second mode, the first air outlet serves as the return air outlet; when the fresh air module is operating, the main air module operates in the first mode, and the valve is open, the main air in the first channel can enter the fresh air intake duct through the valve; when the fresh air module is operating, the main air module operates in the second mode, and the valve is open, the fresh air in the fresh air intake duct can enter the first channel through the valve.

[0017] As can be seen from the above, air conditioners have different requirements for mixed fresh air in different modes. For example, the first mode is the heating mode, which can introduce the warm air in the main air duct into the fresh air duct for mixing in winter through the preheating fresh air function to alleviate the low temperature of the fresh air; the second mode is the cooling mode, which can send the airflow in the fresh air duct into the main air duct and increase the air volume with the help of the outside airflow.

[0018] A further proposed solution is that the main air module also includes a second air outlet. When the main air module operates in the first mode, the second air outlet serves as a return air outlet; when the main air module operates in the second mode, the second air outlet serves as the main air supply outlet. The second air outlet is located at the top of the air supply device, the first channel and the first air outlet are located at the bottom of the air supply device, and the fresh air module is located below the main air module.

[0019] As can be seen from the above, under this configuration, the air supply device of the present invention is suitable for cabinet air conditioners with reversible air supply from top to bottom.

[0020] The second objective of this invention is to provide an air conditioner that includes the aforementioned air supply device.

[0021] The control method for an air conditioner provided by the third objective of this invention uses the aforementioned air conditioner; the control method includes: in heating mode, if the preheating fresh air function is confirmed to be activated: controlling the fresh air module to work, controlling the opening of the fresh air outlet, and controlling the valve to be in the first open state.

[0022] As can be seen from the above scheme, under this setting, the hot air in the first channel is introduced into the fresh air intake duct through the valve to merge with the fresh air. The fresh air is then accelerated and sent into the room by the fresh air fan blades, preheating the cold outdoor air in advance, greatly reducing the temperature difference and improving the user's comfort experience.

[0023] A further solution is to include control methods that, in cooling mode, such as confirming the activation of the high-volume air supply function or the rapid cooling function, control the operation of the fresh air module, control the closure of the fresh air supply vents, and control the valves to be in a second open state.

[0024] As can be seen from the above, under this setting, after the airflow enters through the fresh air inlet, at least a portion of it enters the main air duct through the valve and mixes with the return air entering from the first air outlet (downwind outlet), effectively increasing the air volume supplied by the reversible air supply platform in the cooling mode, and significantly enhancing the cooling efficiency and air circulation capability.

[0025] A further solution is that the control method also includes determining whether to enter the high-temperature sterilization mode: controlling the indoor heat exchanger to heat, controlling the fresh air module to work, controlling the closure of the first air vent and the fresh air supply vent, and controlling the valve to be in the first open state.

[0026] As can be seen from the above, mold may grow in the fresh air duct due to long-term operation, which seriously affects the quality of fresh air. By opening the valve, high-temperature airflow is introduced into the fresh air duct and the duct is sterilized at high temperature, realizing the self-cleaning of the duct and significantly improving the hygiene and safety of the fresh air system. Attached Figure Description

[0027] Figure 1 This is a cross-sectional view of an embodiment of the air conditioner of the present invention.

[0028] Figure 2 This is a cross-sectional view of the fresh air module and the first channel in an embodiment of the air conditioner of the present invention.

[0029] Figure 3 This is a schematic diagram illustrating the principle of the heating mode operation of an embodiment of the air conditioner of the present invention.

[0030] Figure 4 This is a cross-sectional view of the fresh air module and the first channel in the heating mode of an embodiment of the air conditioner of the present invention.

[0031] Figure 5 This is a schematic diagram illustrating the principle of the air conditioner's cooling mode operation in an embodiment of the present invention.

[0032] Figure 6 This is a cross-sectional view of the fresh air module and the first channel in the cooling mode of an embodiment of the air conditioner of the present invention.

[0033] Figure 7This is a first flowchart of an embodiment of the air conditioner control method of the present invention.

[0034] Figure 8 This is a second flowchart of an embodiment of the air conditioner control method of the present invention.

[0035] Figure 9 This is a third flowchart of an embodiment of the air conditioner control method of the present invention.

[0036] Figure 10 This is a fourth flowchart of an embodiment of the air conditioner control method of the present invention.

[0037] Figure 11 This is the fifth flowchart of an embodiment of the air conditioner control method of the present invention.

[0038] Figure 12 This is the sixth flowchart of an embodiment of the air conditioner control method of the present invention.

[0039] Figure 13 This is the seventh flowchart of an embodiment of the air conditioner control method of the present invention.

[0040] Figure 14 This is the eighth flowchart of an embodiment of the air conditioner control method of the present invention. Detailed Implementation

[0041] Examples of air supply devices, air conditioners and their control methods See Figure 1 In this embodiment, the indoor unit of the air conditioner is a cabinet unit, which includes the air supply device of the present invention. The air supply device in this embodiment includes a main air module and a fresh air module 4.

[0042] The main air module includes an air conditioner housing 9, a main fan, a first air duct component 2, and a second air duct component 3. The main fan is a centrifugal fan, comprising a volute 1 and a main fan blade 19 disposed within the volute 1. The volute 1, the first air duct component 2, and the second air duct component 3 constitute the main air duct structure in this embodiment of the invention. The volute 1 includes a fan blade cavity 11, a first air duct section 12, and a second air duct section 13. The main fan blade 19 is a double-suction centrifugal fan blade, disposed within the fan blade cavity 11 and driven to rotate by a motor. Axial suction inlets are provided on both axial sides of the fan blade cavity 11. The first air duct section 12 and the second air duct section 13 are respectively disposed on opposite sides of the outer periphery of the fan blade cavity 11 and are both connected to the fan blade cavity 11. In this embodiment, the first air duct section 12 and the second air duct section 13 are respectively disposed on the upper and lower sides of the fan blade cavity 11, with the outlet 120 of the first air duct section 12 facing downwards and the outlet 130 of the second air duct section 13 facing upwards.

[0043] A first air vent 101 is provided on the lower front side of the outer casing 9, a second air vent 102 is provided on the top of the outer casing 9, and a first air duct component 2 is provided inside the lower part of the outer casing 9.

[0044] The air conditioner also includes an indoor heat exchanger 5, which is located above the outlet 130 of the second air duct section 13. The second air duct component 3 is arranged vertically and connected to the second air outlet 102 where the indoor heat exchanger 5 is located.

[0045] Combination Figure 2 The first air duct component 2 includes a bend 203 and a first end 201 and a second end 202 located on opposite sides of the bend 203. The first end 201 communicates with the first air outlet 101, and the second end 202 communicates with the outlet 120 of the first air duct section 12. The interior of the first air duct section 12 and the interior of the first air duct component 2 constitute the first channel 200 of the present invention. Furthermore, the second end 202 serves as the communication port of the present invention.

[0046] In addition, this embodiment also includes an openable and closable damper at a suitable location to achieve reversible changes in vertical airflow. It should be noted that the following description of achieving reversible vertical airflow is prior art in this technical field.

[0047] See Figure 3 For example, in heating mode, the air intake is at the top and the air outlet is at the bottom, meaning air enters from the second air inlet 102 and exits from the first air inlet 101. Return air entering the second air inlet 102 first flows downwards through the second air duct 3 and reaches the indoor heat exchanger 5 for heat exchange. Because the inlet of the second air duct 13 is blocked, the airflow is redirected to the flow channel between the outer casing 9 and the volute on both axial sides, until it is drawn into the axial air intakes on both sides of the fan blade cavity 11. Then, due to centrifugal force from the main fan blades, it flows downwards, passes through the first channel 12 and the first air duct 2, and exits from the first air inlet 101.

[0048] See Figure 5 For example, in cooling mode, the air intake is at the bottom and the air outlet is at the top, that is, air enters from the first air inlet 101 and is delivered from the second air inlet 102. In this case, the return air enters the first air inlet 101, passes upward through the first air duct component 2 and enters the first air duct section 12. Since the fan blade cavity 11 is blocked and the axial sides of the first air duct section 12 are open, the airflow is turned to flow into the flow channel between the outer casing 9 and the volute on both sides, until it is drawn into the axial air intake on both sides of the fan blade cavity 11. Then, it flows upward due to the centrifugal force of the main fan blade, passes through the second channel section 13, the indoor heat exchanger 5 and the second air duct component 3 and is delivered from the second air inlet 102.

[0049] See also Figure 1 and Figure 2 In this embodiment, the fresh air module 4 is located directly below the main air module. The fresh air module 4 includes a fresh air duct structure and a fresh air fan blade 49 disposed within the fresh air duct structure. The fresh air duct structure mainly includes the housing assembly constituting the fresh air duct 40.

[0050] The fresh air fan blade 49 is a centrifugal fan blade, with its rotation axis vertically oriented and its intake side 491 facing upwards. The fresh air duct structure includes a fresh air inlet 401 and a fresh air outlet 402, respectively located at the rear and front of the air conditioning unit, with the fresh air outlet 402 positioned directly below the first air vent 101. Additionally, the fresh air duct 40 includes a fresh air inlet duct 40a connecting the fresh air inlet 401 and the intake side of the fresh air fan blade 49.

[0051] Furthermore, the first air duct component 2 is provided with a bend 203, which is the bend of the first channel 200 of the present invention, and a wall panel 29 is provided on the outer side of the bend 203.

[0052] The present invention also includes a valve 21 disposed on the wall panel 29. The valve 21 mainly comprises multiple air guide plates 211, combined with… Figure 4 When the air guide plate 211 rotates away from the position of the wall panel, a mixing port 210 is formed on one side of the air guide plate 211. The mixing port 210 is connected between the first channel 200 and the fresh air inlet duct 40a.

[0053] When the valve is closed, the air guide plate 211 blocks the mixing port 210.

[0054] Combination Figure 2 and Figure 4 ,,like Figure 2 As shown by the dashed air guide plate 211, when the valve is in the first open state, the air guide plate 211 is at the first angle and the mixing port 210 is open. In this embodiment, the first angle is approximately -90 degrees relative to the horizontal direction. At this time, the air guide plate 211 extends vertically downward. At this time, one side of the mixing port 210 faces the second end 202 (connecting port), and the other side of the mixing port 210 faces the suction side 491 of the fresh air fan blade 49.

[0055] Combination Figure 2 and Figure 6 ,like Figure 2 As shown by the dashed air guide plate 211', when the valve is in the second open state, the air guide plate 211 is at the second angle and the mixing port 210 is open. In this embodiment, the second angle is approximately 45 degrees relative to the horizontal direction. At this time, the air guide plate 211 extends upward at an angle. At this time, one side of the mixing port 210 faces the second end 202 (connecting port), and the other side of the mixing port 210 faces the fresh air inlet 401.

[0056] In addition, in this embodiment, the first air vent 101, the second air vent 102 and the fresh air supply vent 402 are all provided with corresponding air guide plates, which can close the first air vent 101, the second air vent 102 and the fresh air supply vent 402.

[0057] The air conditioner control method in this embodiment uses the air conditioner of this embodiment. See also... Figures 7 to 10 and combined Figure 5 and Figure 6 The air conditioner control method in this embodiment includes: Execute step S1 and operate in cooling mode according to the instructions.

[0058] Then proceed to step S2 to determine whether the fresh air function is confirmed to be turned on.

[0059] If the judgment result of step S2 is yes, then step S3 is executed, controlling the fresh air module 4 to work, controlling the opening of the fresh air supply vent 402 and controlling the valve 21 to be in the closed state.

[0060] Then, step S4 is executed to determine whether the function to avoid direct airflow is confirmed to be enabled.

[0061] If the judgment result is yes, then execute step S5 to control the air guide plate of the second air outlet 102 (upper air outlet) to swing upward to the upward state.

[0062] If the judgment result is negative, then step S6 is executed to control the air guide plate of the second air outlet 102 (upper air outlet) to swing downward to the downward pressure state.

[0063] If the judgment result of step S2 is negative, then step S7 is executed, the fresh air module 4 is turned off, and it operates in independent cooling mode.

[0064] Then, step S8 is executed to determine whether the function to avoid direct blowing is confirmed to be enabled.

[0065] If the judgment result is yes, then execute step S9 to control the air guide plate of the second air outlet 102 (upper air outlet) to swing upward to the upward state.

[0066] If the judgment result is negative, then step S10 is executed to control the air guide plate of the second air outlet 102 (upper air outlet) to swing downward to the downward pressure state.

[0067] After executing step S9, a judgment step S11 is executed to determine whether the high-volume air supply function is confirmed to be activated. If the judgment result is yes, then step S12 is executed, controlling the main fan blades to operate at their maximum speed, the fresh air module 4 to operate, the control valve 21 to be in the second open state, and the fresh air outlet 402 to be closed. If the judgment result is no, then step 13 is executed, controlling the main fan blades to operate at the preset speed and the control valve 21 to be closed.

[0068] After executing step S10, a judgment step S14 is executed to determine whether the rapid cooling function is confirmed to be activated. If the judgment result is yes, then step S15 is executed, controlling the main fan blade to operate at its maximum speed, the fresh air module 4 to operate, the control valve 21 to be in the second open state, and the fresh air outlet 402 to be closed. If the judgment result is no, then step 16 is executed, controlling the main fan blade to operate at the preset speed and the control valve 21 to be closed.

[0069] After executing steps S12 and S15, the airflow enters through the fresh air inlet 401 and then enters the first channel 200 through valve 21, mixing with the return air entering from the first air outlet 101 (downwind outlet). This effectively increases the airflow volume of the reversible air supply platform in the cooling mode, significantly enhancing the cooling efficiency and air circulation capability.

[0070] See Figure 11 and Figure 12 and combined Figure 5 and Figure 4 The air conditioner control method in this embodiment includes: Execute step S21 to operate in the heating mode according to the instruction.

[0071] Then proceed to step S22 to determine whether the fresh air function is confirmed to be turned on.

[0072] If the judgment result of step S22 is yes, then step S23 is executed to control the fresh air module 4 to work and control the opening of the fresh air outlet 402.

[0073] Then, step S24 is executed to determine whether the preheating fresh air function is confirmed to be turned on.

[0074] If the judgment result is yes, then step S25 is executed, and valve 21 is controlled to be in the first open state. The hot air in the first channel 200 is introduced into the fresh air intake duct 40a through valve 21 to merge with the fresh air. After being accelerated by the fresh air fan blades, it is sent into the room, preheating the cold outdoor air in advance, greatly reducing the temperature difference and improving the user's comfort experience.

[0075] If the judgment result is yes, then step S25 is executed to control valve 21 to be in the closed state.

[0076] If the judgment result of step S22 is negative, then step S27 is executed to control the fresh air module 4 to shut down and the fresh air outlet 402 to shut down, and the system will operate in independent heating mode.

[0077] Then, step S28 is executed to determine whether the rapid heating function is confirmed to be started. If not, the normal heating mode is operated and the judgment continues. If the judgment result is yes, step S29 is executed to control the fresh air module 4 to work and control the valve 21 to be in the second open state.

[0078] See alsoFigure 13 As shown in Figure 14, the air conditioner control method of the present invention further includes: Step S31 determines that the high-temperature sterilization mode will be entered.

[0079] Then, step S32 is executed to close the first air vent 101 and the fresh air supply vent 402, and to keep the valve 21 in the first open state.

[0080] Then, step S33 is executed to control the indoor heat exchanger 5 to heat, control the fresh air module 4 to operate at a low fan speed, and set the temperature threshold range to 60℃ to 75℃.

[0081] Then, the judgment step S34 is executed to determine whether the shell temperature is greater than the preset temperature. In this embodiment, the preset temperature is 65°C.

[0082] If the judgment result is yes, then execute step S35 to control the air conditioner to automatically reduce its frequency.

[0083] If the judgment result is otherwise, proceed to step S36. After running for the first preset duration, control the fan speed of the fresh air module 4 to run for the second preset duration. In this embodiment, the first preset duration is 30 minutes, and the value range of the second preset duration is 30 to 40 minutes.

[0084] Then, step S37 is executed to determine whether the temperature of the temperature sensor inside the fresh air duct is greater than or equal to a second preset value. In this embodiment, the second preset value is 56 degrees Celsius.

[0085] If the judgment result is "no", continue to step S33, and the indoor heat exchanger 5 continues heating; if the judgment result is "yes", then proceed to step S38, and after running for the third preset time, stop heating and open the fresh air supply vent 402. In this embodiment, the third preset time is 20 minutes.

[0086] Mold may grow in the fresh air duct 40 due to long-term operation, which seriously affects the quality of fresh air. By opening the valve 21, high-temperature airflow is introduced into the fresh air duct 40 and the fresh air duct 40 is sterilized at high temperature, realizing the self-cleaning of the duct and significantly improving the hygiene and safety of the fresh air system.

[0087] Finally, it should be emphasized that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. Air supply device, including main air module and fresh air module; The main air module includes a main air duct structure and a main air fan installed in the main air duct structure. The main air duct structure includes a first air outlet. When the main air module operates in a first mode, the first air outlet serves as the main air supply outlet. The fresh air module includes a fresh air duct structure and a fresh air fan installed within the fresh air duct structure. The fresh air duct structure includes a fresh air inlet and a fresh air outlet. Its features are: The main air duct structure includes a first channel connecting the location of the main fan and the first air outlet; The fresh air duct structure includes a fresh air inlet duct connecting the fresh air inlet and the location of the fresh air fan; The air supply device includes a valve disposed between the first channel and the fresh air inlet duct. When the valve is opened, the first channel and the fresh air inlet duct are connected.

2. The air supply device according to claim 1, characterized in that: The valve is equipped with a guide plate. When the valve is in the open state, the valve forms a mixing port on one side of the guide plate. The first channel and the fresh air inlet duct are connected through the mixing port.

3. The air supply device according to claim 2, characterized in that: The first channel includes a connecting port, and the connecting port and the first air vent are located at opposite ends of the first channel, respectively; When the valve is in the first open state, the air guide plate is at a first angle, one side of the mixing port faces the connecting port, and / or the other side of the mixing port faces the air intake side of the fresh air fan; When the valve is in the second open state, the air guide plate is at a second angle, one side of the mixing port faces the connecting port, and / or the other side of the mixing port faces the fresh air inlet.

4. The air supply device according to claim 1, characterized in that: The first channel has a bend, and the valve is located on the outside of the bend.

5. The air supply device according to claim 1, characterized in that: The main air module includes a volute and a first air duct component. The air outlet of the volute is connected to one end of the first air duct component, and the other end of the first air duct component is connected to the first air outlet. The valve is installed on the wall panel of the first air duct component.

6. The air supply device according to any one of claims 1 to 5, characterized in that: When the main air module is operating in the second mode, the first air outlet serves as the return air outlet. When the fresh air module is running, the main air module is running in the first mode and the valve is open, the main air in the first channel can enter the fresh air intake duct through the valve. When the fresh air module is running, the main air module is running in the second mode, and the valve is open, the fresh air in the fresh air inlet duct can enter the first channel through the valve.

7. The air supply device according to claim 6, characterized in that: The main air module also includes a second air outlet. When the main air module operates in the first mode, the second air outlet serves as a return air outlet; when the main air module operates in the second mode, the second air outlet serves as a main supply air outlet. The second air outlet is located at the upper part of the air supply device, the first channel and the first air outlet are located at the lower part of the air supply device, and the fresh air module is located below the main air module.

8. An air conditioner, characterized in that, The air conditioner includes the air supply device as described in any one of claims 1 to 7.

9. A control method for an air conditioner, characterized in that, The air conditioner described in claim 8 is the air conditioner described above. The control method includes: In heating mode, if you confirm that the preheating fresh air function is activated: Control the operation of the fresh air module, control the opening of the fresh air outlet, and control the valve to be in the first open state.

10. The control method for an air conditioner according to claim 9, characterized in that: The control method includes: In cooling mode, if you confirm that the high-volume airflow function or the rapid cooling function is activated: Control the operation of the fresh air module, control the closure of the fresh air supply outlet, and control the valve to be in the second open state.

11. The control method for an air conditioner according to claim 9 or 10, characterized in that: The control method further includes: If it is determined to enter the high-temperature sterilization mode: The system controls the heating of the indoor heat exchanger, controls the operation of the fresh air module, controls the closure of the first air vent and the fresh air supply vent, and controls the valve to be in the first open state.

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