Floor standing air conditioner and control method thereof

Abstract

The application provides a floor type air conditioner and a control method thereof, and belongs to the technical field of air conditioning. The air conditioner comprises a shell, an upper axial flow fan blade and a lower axial flow fan blade are arranged in the shell, at least one of an upper air outlet and a lower air outlet is provided with a guide grille, the guide grille can rotate so that the guide grille pieces of the guide grille can be switched between a first position and a second position, and the deflection direction of the guide grille pieces when the guide grille is in the first position is opposite to the deflection direction of the guide grille pieces when the guide grille is in the second position. Whether the deflection direction of the guide grille pieces on the air conditioner is the same as the air outlet rotation direction of the corresponding axial flow fan blade can be determined, so that the far and near control of the air outlet distance in the corresponding air outlet can be realized. When the user is close to the air conditioner, the corresponding guide grille can be controlled to be flipped to the corresponding position to realize close-range air supply, the heat exchange effect of the heat exchanger is ensured, the energy is fully utilized, and the user comfort is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of air conditioning technology, and particularly relates to a floor type air conditioner and a control method thereof. BACKGROUND

[0002] With the rapid development of air conditioning technology, air conditioner fan systems are not only limited to cross-flow fans and centrifugal fans, but also axial flow fan blades are used in air conditioner indoor units. The cabinet machine with a double air outlet structure is provided with a guide grille at each of the double air outlet. Due to the large air outlet speed of the axial flow fan blade, especially the double air outlet, the user cannot avoid the air blowing by standing or sitting, which will cause discomfort. At this time, the user often closes one of the fans to achieve the purpose of directly blowing the person at the air outlet. However, closing the fan will cause the corresponding heat exchanger to not work normally, resulting in poor heat exchange and energy loss. SUMMARY

[0003] Therefore, the present application provides a floor type air conditioner and a control method thereof, which can solve the technical problem that the floor type air conditioner with a double axial flow fan blade up and down air outlet structure needs to stop the operation of one fan to prevent the discomfort caused by direct air blowing, resulting in poor heat exchange of the heat exchanger and energy loss.

[0004] To solve the above problems, the present application provides a floor type air conditioner, which comprises a shell, the shell is provided with an upper air outlet and a lower air outlet which are arranged at intervals in the height direction, the shell is provided with an upper axial flow fan blade corresponding to the upper air outlet and a lower axial flow fan blade corresponding to the lower air outlet, at least one of the upper air outlet and the lower air outlet is provided with a guide grille, the guide grille is provided with a plurality of spaced guide grille pieces, the guide grille can rotate around a vertical axis to switch the guide grille pieces between a first position and a second position, the deflection direction of the guide grille pieces of the guide grille in the first position around the rotation axis of the corresponding axial flow fan blade is opposite to the deflection direction of the guide grille pieces of the guide grille in the second position around the rotation axis of the corresponding axial flow fan blade.

[0005] In some embodiments, a grille turnover driving component is arranged adjacent to the guide grille, the grille turnover driving component is drivingly connected with the guide grille to drive the guide grille to turn over inside and outside the shell along the vertical axis thereof.

[0006] In some embodiments, the grille turnover driving component comprises a rotary motor, the guide grille further comprises an outer frame, the radial outer end of the guide grille piece is connected with the radial inner side of the outer frame, the radial outer side of the outer frame is provided with a driving sleeve, and the output shaft of the rotary motor is sleeved in the driving sleeve.

[0007] In some embodiments, the radially outer side of the outer frame further has a support rotating shaft, which is coaxial with the driving sleeve and is located on the side of the outer frame away from the driving sleeve, and the support rotating shaft is rotatably connected with the shell.

[0008] In some embodiments, the air guiding grilles are correspondingly arranged in the upper air outlet and the lower air outlet.

[0009] In some embodiments, the upper axial flow fan blade and the lower axial flow fan blade have the same air outlet rotation direction; and / or, the shell further has a heat exchanger, and the upper axial flow fan blade and the lower axial flow fan blade are located on the side of the heat exchanger facing the upper air outlet.

[0010] In some embodiments, the first position and the second position are 180° apart.

[0011] The application further provides a control method of a floor type air conditioner, which is used for controlling the operation of the above floor type air conditioner, and comprises the following steps:

[0012] obtaining the activity area of a user and the operation mode of the air conditioner, wherein the activity area comprises a first area far away from the floor type air conditioner and a second area close to the floor type air conditioner;

[0013] when the obtained activity area of the user is the first area alone, controlling the position switching of the air guiding grilles in the upper air outlet and the lower air outlet, so that the upper air outlet and the lower air outlet both perform long-distance air supply;

[0014] otherwise, according to the obtained operation mode, controlling the position switching of the air guiding grilles in at least one of the upper air outlet and the lower air outlet, so that one of the upper air outlet and the lower air outlet performs long-distance air supply, and the other performs short-distance air supply.

[0015] In some embodiments, the operation mode comprises a heating mode and a cooling mode, and according to the obtained operation mode, the position switching of the air guiding grilles in at least one of the upper air outlet and the lower air outlet is controlled, so that one of the upper air outlet and the lower air outlet performs long-distance air supply, and the other performs short-distance air supply, which specifically comprises:

[0016] when the obtained operation mode is the heating mode, the upper air outlet is controlled to perform short-distance air supply, and the lower air outlet is controlled to perform long-distance air supply; or,

[0017] when the obtained operation mode is the cooling mode, the upper air outlet is controlled to perform long-distance air supply, and the lower air outlet is controlled to perform short-distance air supply.

[0018] In some embodiments, when the upper air outlet and / or the lower air outlet performs long-distance air supply, the deflection direction of the air guide grille blades of the corresponding air guide grille is controlled to be opposite to the air outlet rotation direction of the corresponding axial flow fan blade; or

[0019] When the upper air outlet or the lower air outlet performs close-range air supply, the deflection direction of the air guide grille pieces of the corresponding air guide grille is controlled to be the same as the air outlet rotation direction of the corresponding axial flow fan blade.

[0020] The present invention provides a floor-standing air conditioner and a control method thereof. By setting a flippable air guide grille, it is possible to utilize whether the deflection direction of the air guide grille pieces thereon is the same as the air outlet rotation direction of the corresponding axial flow fan blades, thereby achieving the distance control of the air outlet distance in the corresponding air outlet. In this way, when the user is close to the air conditioner, the corresponding air guide grille can be controlled to flip to the corresponding position to achieve close-range air supply without controlling the corresponding axial flow fan blades to stop running, thereby ensuring the heat exchange effect of the heat exchanger, fully utilizing the energy, preventing the cold air flow from blowing directly onto the human body in the cooling mode, and improving the user's comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of the external structure of a floor-standing air conditioner according to an embodiment of the present invention, wherein arrows in the figure indicate the direction of air flow;

[0022] Figure 2 Schematic diagram of the internal structure of a floor-standing air conditioner according to an embodiment of the present invention (some components are omitted);

[0023] Figure 3 for Figure 1 A schematic structural diagram of the air guide grille in FIG, which is in the first position at this time, and the arrow in the figure shows the rotation direction of the rotary motor;

[0024] Figure 4 for Figure 1 Schematic diagram of the structure of the air guide grille, which is in the second position

[0025] Figure 5 This is a schematic diagram of the state of the floor-standing air conditioner in the present invention in a temperature-controlled space;

[0026] Figure 6 This is a simulation diagram of a long-distance air supply state formed when the deflection direction of the air guide grille blades of the air guide grille in the embodiment of the present invention is opposite to the air outlet rotation direction of the axial flow fan blades;

[0027] Figure 7 This is a simulation diagram of a close-range air supply state formed when the deflection direction of the air guide grille blades of the air guide grille is the same as the air outlet rotation direction of the axial flow fan blades in an embodiment of the present invention.

[0028] The reference numerals indicate:

[0029] 1. Housing; 11. Upper air outlet; 12. Lower air outlet; 2. Air guide grille; 21. Air guide grille blades; 22. Outer frame; 23. Drive sleeve; 31. Upper axial flow fan blade; 32. Lower axial flow fan blade; 4. Rotary motor; 5. Heat exchanger. DETAILED DESCRIPTION

[0030] See also Figures 1 to 7 As shown, according to an embodiment of the present invention, a floor-standing air conditioner is provided, comprising a housing 1, the housing 1 having an upper air outlet 11 and a lower air outlet 12 spaced apart in a height direction, the housing 1 having an upper axial flow fan blade 31 corresponding to the upper air outlet 11 and a lower axial flow fan blade 32 corresponding to the lower air outlet 12, the rotation axes of the upper axial flow fan blade 31 and the lower axial flow fan blade 32 being parallel and horizontal, at least one of the upper air outlet 11 and the lower air outlet 12 being provided with an air guide grille 2, the air guide grille 2 having a plurality of spaced apart air guide grille blades 21 The air guide grille 2 can rotate around the vertical axis so that the air guide grille pieces 21 of the air guide grille 2 can flip and switch between the first position and the second position. When the air guide grille 2 is in the first position, the deflection direction of the air guide grille pieces 21 around the rotation axis of the corresponding axial flow fan blade is opposite to the deflection direction of the air guide grille pieces 21 around the rotation axis of the corresponding axial flow fan blade when the air guide grille 2 is in the second position. That is, when the deflection direction of the air guide grille pieces 21 is clockwise in the first position, the deflection direction of the air guide grille pieces 21 is counterclockwise in the second position, and vice versa. In this technical solution, by providing a reversible air guide grille 2, the deflection direction of the air guide grille slats 21 thereon can be used to determine whether it is the same as the air outlet rotation direction of the corresponding axial flow fan blade, thereby achieving distance control of the air outlet distance of the corresponding air outlet. In this way, when the user is close to the air conditioner, the corresponding air guide grille 2 can be controlled to flip to the corresponding position to achieve close-range air supply without having to control the corresponding axial flow fan blade to stop operating. This ensures the heat exchange effect of the heat exchanger 5, fully utilizes energy, prevents the cold air flow from blowing directly onto the user in cooling mode, and improves user comfort. In a preferred embodiment, the angle difference between the first position and the second position is 180°, that is, the air guide grille 2 can be switched between the first position and the second position by flipping 180°.

[0031] See also Figure 6 and Figure 7 As can be seen from the simulation diagram, see Figure 6 When the axial flow fan blades rotate in the opposite direction to the deflection direction of the air guide grille 21, the blown wind can form a columnar spiral wind, which can achieve a long-distance air supply mode; on the contrary, see Figure 7As shown, the rotation direction of the axial flow fan is the same as the deflection direction of the air guide grille, and the blown air is dispersed, so that the close-range air supply mode can be realized. It should be particularly pointed out that in the present application, the rotation direction of the axial flow fan is the rotation direction of the axial flow fan, which refers to the rotation direction in which the fan can normally blow air. When the rotation direction of the fan is opposite, the fan cannot effectively drive the airflow to blow out. The deflection direction of the air guide grille 21 refers to the direction opposite to the convex direction of the approximately arc-shaped air guide grille 21. For example, the counterclockwise direction in Figure 3 is the deflection direction, and Figure 4 is the deflection direction.

[0032] The wind speed data measured at the air outlet under the conditions that the rotation direction of the fan is the same as or opposite to the deflection direction of the air guide grille 21 is shown in the following table. It can be clearly seen from the table that the air supply distance when the rotation direction of the fan is the same as the deflection direction of the air guide grille 21 is obviously smaller than the air supply distance when the rotation direction of the fan is opposite to the deflection direction of the air guide grille 21.

[0033]

[0034]

[0035] In some embodiments, the air guide grille 2 is provided with a grille overturning driving component, which is drivingly connected with the air guide grille 2 to drive the air guide grille 2 to overturn along its vertical axis inside and outside the shell 1. The automatic switching of the air guide grille 2 between the first position and the second position is realized by controlling the operation of the grille overturning driving component, which is beneficial to the intelligent control of the air conditioner.

[0036] The grille overturning driving component includes a rotary motor 4, which is fixedly connected with the shell 1. The air guide grille 2 further includes an outer frame 22, the radial outer end of the air guide grille 21 is connected with the radial inner side of the outer frame 22, and the radial outer side of the outer frame 22 has a driving sleeve 23, and the output shaft of the rotary motor 4 is sleeved in the driving sleeve 23. In this technical solution, the rotary motor 4 and the driving sleeve 23 are sleeved to realize the reliable driving of the rotary motor 4 to the air guide grille 2, which is simple in structure and has higher driving efficiency by using direct driving.

[0037] In another preferred embodiment, the radial outer side of the outer frame 22 further has a support shaft (not shown in the figure, not referenced), which is coaxial with the driving sleeve 23 and is located on the side of the outer frame 22 away from the driving sleeve 23. The support shaft is rotatably connected with the shell 1. In this technical solution, one side of the air guide grille 2 is reliably supported by the rotary motor 4, and the other side is reliably supported by the support shaft, so that the overall overturning is more stable and reliable.

[0038] As a preferred solution, the air guide grilles 2 are arranged in the upper air outlet 11 and the lower air outlet 12 respectively, so that the upper air outlet 11 and the lower air outlet 12 can have the switching function of close-range air supply and long-range air supply.

[0039] In order to simplify the control logic of the air supply distance, preferably, the air supply rotation directions of the upper axial fan blades 31 and the lower axial fan blades 32 are the same, so that the switching of the close-range air supply and the long-range air supply of the corresponding air outlets can be realized by only turning over the air guide grilles 2.

[0040] Referring to Figure 2 The heat exchanger 5 is arranged in the shell 1, and the upper axial fan blades 31 and the lower axial fan blades 32 are located on the side of the heat exchanger 5 facing the upper air outlet 11, so that the small spacing between the axial fan blades and the air guide grilles 2 can be realized, and the relative relationship of the rotation directions of the two can be utilized to achieve the purpose of close-range air supply and long-range air supply.

[0041] According to the embodiment of the present application, a control method of the floor type air conditioner is also provided, which is used for controlling the operation of the floor type air conditioner, and the control method comprises the following steps:

[0042] Obtaining the activity area of the user and the operation mode of the air conditioner, the activity area comprising a first area far away from the floor type air conditioner and a second area close to the floor type air conditioner;

[0043] When the obtained activity area of the user is the first area alone, the position switching of the air guide grilles 2 in the upper air outlet 11 and the lower air outlet 12 is controlled, so that the upper air outlet 11 and the lower air outlet 12 both perform long-range air supply;

[0044] Otherwise, the position switching of the air guide grilles 2 in at least one of the upper air outlet 11 and the lower air outlet 12 is controlled according to the obtained operation mode, so that one of the upper air outlet 11 and the lower air outlet 12 performs long-range air supply, and the other performs close-range air supply.

[0045] In the technical solution, whether there is a person in the second area close to the air conditioner or the first area far away from the air conditioner, that is, the activity area of the user is obtained, and then the air supply mode of the upper air outlet and the lower air outlet of the air conditioner can be controlled according to the specific activity area of the user, which is beneficial to improve the temperature uniformity and the temperature adjusting efficiency of the temperature adjusting space, ensures the air conditioning use comfort of the user, and realizes the intelligent air supply of the air conditioner.

[0046] In a specific embodiment, the first area (such as the area 1 in Figure 5 ) and the second area (such as the area 2 in Figure 5 ) are limited by 2m away from the air outlet of the air conditioner, the area less than 2m is the second area, and the area more than 2m is the first area.

[0047] Specifically, the operation mode includes a heating mode and a cooling mode, and the position switching of the air guide grating 2 in at least one of the upper air outlet 11 and the lower air outlet 12 is controlled according to the obtained operation mode, so that one of the upper air outlet 11 and the lower air outlet 12 performs long-distance air supply, and the other performs short-distance air supply, which specifically includes: when the obtained operation mode is the heating mode, the upper air outlet 11 is controlled to perform short-distance air supply, and the lower air outlet 12 is controlled to perform long-distance air supply, so that the physical characteristics of the smaller heat airflow density can be utilized, the heat airflow sent out by the lower air outlet 12 can rise from bottom to top, the long-distance air supply of the lower air outlet 12 can ensure that the heat airflow directly contacts the user in the first area and the second area to generate limb contact, thereby improving the comfort of the user and achieving the purpose of carpet heating, and at this time, the upper air outlet 11 performs short-distance air supply without sending out a long distance, which is more energy-saving; or when the obtained operation mode is the cooling mode, the upper air outlet 11 is controlled to perform long-distance air supply, and the lower air outlet 12 is controlled to perform short-distance air supply, so that the physical characteristics of the larger cold airflow density can be utilized, the cold airflow sent out by the upper air outlet 11 can sink from top to bottom, and the short-distance air supply of the lower air outlet 12 can avoid the direct limb contact between the cold air sent out by the lower air outlet 12 and the user as much as possible, thereby improving the comfort of the user and achieving the purpose of bathing cooling.

[0048] As described above, when the upper air outlet 11 and / or the lower air outlet 12 performs long-distance air supply, the deflection direction of the air guide grating piece 21 of the corresponding air guide grating 2 is controlled to be opposite to the air outlet rotation direction of the corresponding axial flow fan blade, that is, when the axial flow fan blade rotates clockwise, and the first position is the deflection of the air guide grating piece 21 of the corresponding air guide grating 2 is counterclockwise, the air guide grating 2 is controlled to be in the first position, and at this time, the deflection of the air guide grating piece 21 in the second position is clockwise; or when the upper air outlet 11 or the lower air outlet 12 performs short-distance air supply, the deflection direction of the air guide grating piece 21 of the corresponding air guide grating 2 is controlled to be the same as the air outlet rotation direction of the corresponding axial flow fan blade, that is, when the axial flow fan blade rotates clockwise, the air guide grating 2 is controlled to be in the second position, and specifically, the air guide grating 2 can be controlled to rotate 180° from the first position to the second position.

[0049] The following will be described in detail with reference to the accompanying drawings Figure 5 Further illustrate the intelligent air supply function of the present application in the cooling mode and the heating mode, taking the rotation direction of the upper axial flow fan blade 31 and the lower axial flow fan blade 32 as counterclockwise as an example:

[0050] (1) Cooling mode:

[0051]

[0052] I. Cooling mode - detecting a single area as a human activity area

[0053] In region 1, representing more than 2 meters distance with human activity, considering the demand for cold, the upper air outlet and the lower air outlet are both far distance air supply mode, so the rotation angle of the guide grille of the upper air outlet and the lower air outlet is 0° (i.e. in the second position, same below). In region 2, representing the air outlet within 2 meters of the human activity, because of the cold air sinking problem in the refrigeration mode, and considering that the lower air outlet blows cold air mostly on the human body affecting the comfort, so the upper air outlet is a far distance air supply mode, and the lower air outlet is a near distance air supply mode, the rotation angle of the guide grille of the upper air outlet is 0°, and the rotation angle of the guide grille of the lower air outlet is 180° (i.e. in the first position, same below).

[0054] II. Refrigeration mode - detecting human activity area as multiple areas

[0055] Multiple air supply areas represent that there are human activities in region 1 and region 2, and because of the problem of near cooling air blowing on the human body affecting the comfort, the detection method is the same as single air supply region 2. The upper air outlet is a far distance air supply mode, and the lower air outlet is a near distance air supply mode, the rotation angle of the guide grille of the upper air outlet is 0°, and the rotation angle of the guide grille of the lower air outlet is 180°.

[0056] (2) Heating mode:

[0057]

[0058] I. Heating mode - detecting human activity area as a single area

[0059] In region 1, representing more than 2 meters distance with human activity, considering the demand for heat, the upper air outlet and the lower air outlet are both far distance air supply mode, so the rotation angle of the guide grille of the upper air outlet and the lower air outlet is 0°. In region 2, representing the air outlet within 2 meters of the human activity, because of the hot air floating problem in the heating mode, so the upper air outlet is a near distance air supply mode, and the lower air outlet is a far distance air supply mode, the rotation angle of the guide grille of the upper air outlet is 180°, and the rotation angle of the guide grille of the lower air outlet is 0°.

[0060] II. Heating mode - detecting human activity area as multiple air supply areas

[0061] Multiple air supply areas represent that there are human activities in region 1 and region 2, and because of the problem of hot air floating in the heating mode, the detection method is the same as single air supply region 2. The upper air outlet is a near distance air supply mode, and the lower air outlet is a far distance air supply mode, the rotation angle of the guide grille of the upper air outlet is 180°, and the rotation angle of the guide grille of the lower air outlet is 0°.

[0062] It is easy for those skilled in the art to understand that the advantageous technical features of each of the above modes can be freely combined and superimposed without conflict.

[0063] The above merely describes the preferred embodiments of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application. The above merely describes the preferred embodiments of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A floor standing air conditioner characterized by comprising: The air conditioner comprises a shell (1) having an upper air outlet (11) and a lower air outlet (12) arranged at intervals in the height direction, and an upper axial-flow fan blade (31) corresponding to the upper air outlet (11) and a lower axial-flow fan blade (32) corresponding to the lower air outlet (12) arranged in the shell (1). At least one of the upper air outlet (11) and the lower air outlet (12) is provided with a wind guide grille (2) having a plurality of spaced wind guide grille pieces (21). The wind guide grille (2) can rotate around a vertical axis to switch the wind guide grille pieces (21) of the wind guide grille (2) between a first position and a second position. The deflection direction of the wind guide grille pieces (21) of the wind guide grille (2) around the rotation axis of the corresponding axial-flow fan blade in the first position is opposite to the deflection direction of the wind guide grille pieces (21) around the rotation axis of the corresponding axial-flow fan blade in the second position.

2. The floor-mounted air conditioner according to claim 1, wherein A grille flipping driving component is arranged near the wind guide grille (2) and is drivingly connected with the wind guide grille (2) to drive the wind guide grille (2) to flip along its vertical axis between the inside and outside of the shell (1).

3. The floor-mounted air conditioner according to claim 2, wherein The grille flipping driving component comprises a rotary motor (4), and the wind guide grille (2) further comprises an outer frame (22), the radially outer end of the wind guide grille piece (21) is connected with the radially inner side of the outer frame (22), and the radially outer side of the outer frame (22) has a driving sleeve (23), and the output shaft of the rotary motor (4) is sleeved in the driving sleeve (23).

4. The floor-mounted air conditioner according to claim 3, wherein The radially outer side of the outer frame (22) further has a support rotating shaft coaxial with the driving sleeve (23) and located on the side of the outer frame (22) away from the driving sleeve (23), and the support rotating shaft is rotatably connected with the shell (1).

5. The floor air conditioner according to any one of claims 1 to 4, characterized in that, The upper air outlet (11) and the lower air outlet (12) are both provided with the wind guide grille (2) correspondingly.

6. The floor type air conditioner according to claim 5, wherein The air outlet rotation directions of the upper axial-flow fan blade (31) and the lower axial-flow fan blade (32) are the same; and / or, a heat exchanger (5) is further arranged in the shell (1), and the upper axial-flow fan blade (31) and the lower axial-flow fan blade (32) are located on the side of the heat exchanger (5) facing the upper air outlet (11).

7. The floor type air conditioner according to claim 1, wherein The first position and the second position are different by 180°.

8. A control method of a floor standing air conditioner, characterized by, The control method for controlling the operation of the floor air conditioner of claim 5 or 6 comprises the following steps: Obtaining the activity area of the user and the operation mode of the air conditioner, the activity area comprising a first area far away from the floor air conditioner and a second area close to the floor air conditioner; When the obtained activity area of the user is the first area alone, the position of the wind guide grille (2) in the upper air outlet (11) and the lower air outlet (12) is switched to make the upper air outlet (11) and the lower air outlet (12) both perform long-distance air supply. Otherwise, according to the obtained operation mode, the position switching of the air guide grille (2) in at least one of the upper air outlet (11) and the lower air outlet (12) is controlled, so that one of the upper air outlet (11) and the lower air outlet (12) performs long-distance air supply, and the other performs short-distance air supply.

9. The control method according to claim 8, characterized by, The operation mode includes a heating mode and a cooling mode, and according to the obtained operation mode, the position switching of the air guide grille (2) in at least one of the upper air outlet (11) and the lower air outlet (12) is controlled, so that one of the upper air outlet (11) and the lower air outlet (12) performs long-distance air supply, and the other performs short-distance air supply, which specifically includes: When the obtained operation mode is the heating mode, the upper air outlet (11) is controlled to perform short-distance air supply, and the lower air outlet (12) is controlled to perform long-distance air supply; or When the obtained operation mode is the cooling mode, the upper air outlet (11) is controlled to perform long-distance air supply, and the lower air outlet (12) is controlled to perform short-distance air supply.

10. The control method according to claim 8 or 9, characterized by, When the upper air outlet (11) and / or the lower air outlet (12) performs long-distance air supply, the deflection direction of the air guide grille piece (21) of the corresponding air guide grille (2) is controlled to be opposite to the air outlet rotation direction of the corresponding axial flow fan blade; or When the upper air outlet (11) or the lower air outlet (12) performs short-distance air supply, the deflection direction of the air guide grille piece (21) of the corresponding air guide grille (2) is controlled to be the same as the air outlet rotation direction of the corresponding axial flow fan blade.

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