An air deflector, indoor unit and control method

Abstract

The application provides a register, an indoor unit and a control method, wherein the register is provided with a gap extending along a first direction, the gap separates the register into a front edge part and a main body part in a register direction, and the first direction is perpendicular to the register direction; in a cross section perpendicular to the first direction, the cross section profile of the main body part is a first airfoil profile, the head of the first airfoil profile is located at a side of the main body part close to the front edge part, the cross section profile of the front edge part outside the gap is a head profile of a second airfoil profile, the included angle of the chord line of the front edge part and the chord line of the main body part is β, the chord length of the front edge part is L1, the width of the narrowest part of the gap is L2, and the chord length of the main body part is L3; β = 10-30°, and L3 = 6L1-10L1, L1 = 2L2-5L2. According to the application, the flow blockage of the leeward surface of the register can be reduced, the air volume of the register is almost not attenuated when the register is deflected at a large angle, and the air supply volume of the register is improved; and the unsteady vortex flow can be avoided, and the vortex noise generated by the register is reduced.

Description

Technical Field

[0001] This invention belongs to the field of air conditioning technology, specifically relating to an air guide plate, an indoor unit, and a control method. Background Technology

[0002] Wall-mounted air conditioners are an indispensable appliance in modern homes and offices, with a wide range of applications. As living standards improve, people have higher requirements for the comfort and health of their indoor environment, making the air delivery performance of air conditioners a focus of attention.

[0003] Wall-mounted air conditioners have an indoor unit with an upper and lower air vent. The indoor unit features an upper air outlet mode, where air is drawn in through the lower vent and expelled through the upper vent. An air guide vane is located at the upper vent, assisting in airflow during the upper air outlet operation. This vane has a flat, flat structure. When the vane deflects air at a large angle, the airflow is significantly deflected, resulting in substantial flow separation on the leeward side of the vane. This separation zone contains large-scale vortices, reducing the effective flow area and creating additional resistance. This significantly reduces the airflow delivered by the vane, negatively impacting the user experience. Summary of the Invention

[0004] Therefore, the present invention provides an air guide plate, an indoor unit, and a control method, which can solve the technical problem in the prior art that the air guide plate has high resistance when guiding air at a large angle, resulting in a reduction in air volume.

[0005] To solve the above problems, the present invention provides an air guide plate, wherein the air guide plate is provided with a slit extending along a first direction, the slit dividing the air guide plate into a leading edge portion and a main body portion in the air guiding direction; the first direction is perpendicular to the air guiding direction;

[0006] In a cross section perpendicular to the first direction, the cross-sectional profile of the main body is a first airfoil profile, the head of the first airfoil profile is located on the side of the main body near the leading edge, the cross-sectional profile of the leading edge outside the gap is the head profile of the second airfoil profile, the angle between the chord of the leading edge and the chord of the main body is β, the chord length of the leading edge is L1, the width of the narrowest part of the gap is L2, and the chord length of the main body is L3;

[0007] Where β = 10°~30°, and L3 = 6L1~10L1, L1 = 2L2~5L2.

[0008] In some embodiments, within a cross section perpendicular to the first direction, the cross-sectional profile of the leading edge at the gap is taken as the first profile. The first profile and the leeward surface of the leading edge intersect at point O1, and the angle between the tangent of the first profile at point O1 and the tangent of the leeward surface of the leading edge at point O1 is α, where α = 10° to 20°.

[0009] In some embodiments, within a cross section perpendicular to the first direction, the cross-sectional profile of the leading edge at the gap is taken as the first profile, the first profile and the windward surface of the leading edge intersect at point O2, and the angle between the tangent of the first profile at point O2 and the tangent of the windward surface of the leading edge at point O2 is 90 degrees.

[0010] In some embodiments, the number of slits is two or more, and they are arranged sequentially at intervals along a first direction on the air guide plate; wherein, a rib is formed between two adjacent slits to connect the leading edge and the main body.

[0011] In some embodiments, the air guide plate has a first lug at one end along the first direction, connecting one end of the leading edge and one end of the main body, and a second lug at the other end along the first direction, connecting the other end of the leading edge and the other end of the main body; wherein, the first lug is used to connect with an external motor, and the second lug is used to connect with an external rotating shaft.

[0012] The present invention also provides an indoor unit comprising the air guide plate described in any one of the above-mentioned embodiments.

[0013] In some embodiments, the indoor unit includes a housing with a wall-mounting bracket, the housing having a back side facing the wall and a front side facing the back side; the housing also has an upper air vent and a lower air vent; an air guide plate is rotatably disposed at the upper air vent, one end of the air guide plate being a rotating end and the other end being a free end; when the air guide plate is closed, the rotating end of the air guide plate is closer to the back side relative to the free end;

[0014] The number of air guide plates is two or more, and they are arranged at intervals from the front to the back at the upper air outlet; the indoor unit has a bottom air outlet mode, in which air enters at the upper air outlet and exits at the bottom air outlet, and the opening angle of each air guide plate gradually increases from the front to the back.

[0015] In some embodiments, from the front to the back, each of the air guide plates includes a first air guide plate, a second air guide plate, and a third air guide plate arranged sequentially; wherein, in the downward air outlet mode, the opening angle of the first air guide plate is 60° to 70°, the opening angle of the second air guide plate is 70° to 80°, and the opening angle of the third air guide plate is 80° to 90°.

[0016] In some embodiments, the indoor unit also has an upward air outlet mode, in which air enters through the downward air outlet and exits through the upward air outlet, and the opening angle of each of the air guide vanes is consistent and is between 30° and 45°.

[0017] In some embodiments, the indoor unit further includes a reversible axial flow fan, which is disposed inside the housing and located between the upper air vent and the lower air vent.

[0018] The reversible axial flow fan is used to drive airflow from the downwind inlet to the upwind outlet when rotating in the forward direction; the reversible axial flow fan is used to drive airflow from the upwind outlet to the downwind outlet when rotating in the reverse direction.

[0019] This invention also provides a control method for an indoor unit, characterized by comprising the following steps:

[0020] Step S1: Obtain the operating mode of the indoor unit, which includes a cooling mode and a heating mode;

[0021] Step S2: When the indoor unit is in the cooling mode, the indoor unit controls the reversible axial flow fan to rotate forward by default, and controls each of the air guide plates to open at a first preset angle when air is supplied at a first distance, and controls each of the air guide plates to open at a second preset angle when air is supplied at a second distance; wherein, the first distance is less than the second distance, and the first preset angle is greater than the second preset angle;

[0022] When the indoor unit is in heating mode, the indoor unit controls the reversible axial flow fan to reverse and controls each of the air guide vanes to open in the downward air outlet mode by default.

[0023] The air guide plate, indoor unit, and control method provided by this invention have the following beneficial effects:

[0024] 1. The present invention designs a gap between the front edge of the air guide plate and the main body. This gap allows a small stream of air to accelerate under the pressure difference between the windward and leeward sides of the air guide plate, thereby blowing the airflow on the leeward side of the air guide plate and avoiding flow separation on the leeward side of the air guide plate. This reduces flow blockage on the leeward side of the air guide plate, so that the airflow is almost unaffected when the air guide plate is deflected at a large angle, thus increasing the air delivery volume of the air guide plate.

[0025] 2. Because the structure of the wind guide plate of the present invention reduces the flow separation on the leeward side of the wind guide plate, it also avoids unsteady vortex flow and reduces the vortex noise generated by the wind guide plate. Attached Figure Description

[0026] To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of a structure reflecting the leeward side of a wind guide plate according to an embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure reflecting the windward side of the air guide plate according to an embodiment of the present invention;

[0029] Figure 3 This is a schematic diagram reflecting the chord lengths of both the leading edge and the main body, provided by an embodiment of the present invention;

[0030] Figure 4 This is a schematic diagram reflecting the angle between the chord lines of the leading edge and the main body, provided by an embodiment of the present invention;

[0031] Figure 5 The simulated streamline diagram of the flow field of a traditional flat plate air guide plate when the airflow is turned 45° at the outlet;

[0032] Figure 6 The diagram shows the flow field simulation streamline of the air guide plate of the present invention when the outlet airflow is turned by 45°;

[0033] Figure 7 The simulated streamline diagram of the flow field of a traditional flat plate air guide plate when the airflow turns 60° at the outlet;

[0034] Figure 8 The diagram shows the flow field simulation streamline of the air guide plate of the present invention when the outlet airflow is turned by 60°;

[0035] Figure 9 This is a perspective view of an indoor unit provided in an embodiment of the present invention;

[0036] Figure 10 This is a schematic diagram of an indoor unit with air outlet at the top, provided in an embodiment of the present invention;

[0037] Figure 11 This is a schematic diagram of an indoor unit with downward airflow provided in an embodiment of the present invention;

[0038] Figure 12 This is the control flowchart of the indoor unit of the present invention.

[0039] The attached figures are labeled as follows:

[0040] 1. Front edge; 2. Main body; 3. First hanging ear; 4. Second hanging ear; 5. Rib plate; 6. Gap; 7. Motor; 8. Lower air guide plate; 9. Housing; 10. Air guide plate; 11. Chord line of the front edge; 12. Windward side of the front edge; 13. Leeward side of the front edge; 14. Heat exchanger; 15. Reversible axial flow fan; 16. Water tray; 17. First outline; 18. Wall mount bracket; 21. Chord line of the main body; 31. First connecting hole; 41. Second connecting hole; 91. Back; 92. Front; 101. First air guide plate; 102. Second air guide plate; 103. Third air guide plate; 901. Upper air outlet; 902. Lower air outlet; a. Air guiding direction; b. First direction; 10a. Rotating end; 10b. Free end. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0043] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0044] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0045] See also Figure 1-4 As shown, according to an embodiment of the present invention, an air guide plate 10 is provided, the air guide plate 10 having a slit 6 extending along a first direction b, the slit 6 dividing the air guide plate 10 into a leading edge portion 1 and a main body portion 2 in the air guiding direction a. The first direction b is perpendicular to the air guiding direction a.

[0046] In a cross-section perpendicular to the first direction b, the cross-sectional profile of the main body 2 is a first airfoil profile. The head of this first airfoil profile is located on the side of the main body 2 near the leading edge 1. The cross-sectional profile of the leading edge 1 outside the gap 6 is the head profile of the second airfoil profile. The angle between the chord of the leading edge 1 and the chord of the main body 2 is β. The chord length of the leading edge 1 is L1. The width at the narrowest point of the gap 6 is L2. The chord length of the main body 2 is L3. Wherein, β = 10° to 30°, and L3 = 6L1 to 10L1, L1 = 2L2 to 5L2. Preferably, β = 15°, and L3 = 8L1, L1 = 3L2.

[0047] Traditional plate-type air guides exhibit high resistance when deflecting airflow at large angles, reducing the air volume delivered. Furthermore, large-scale flow separation easily occurs on the leeward side, which can block the flow channel and generate vortex noise. In contrast, this invention, through the aforementioned design, allows a small stream of air to flow through the gap 6 between the leading edge 1 and the main body 2 of the air guide 10. This airflow is accelerated by the pressure difference between the windward and leeward sides of the air guide, thus agitating the airflow on the leeward side of the air guide 10. This prevents flow separation on the leeward side of the air guide 10, reducing flow blockage and ensuring almost no airflow reduction when the air guide 10 deflects at large angles, thereby increasing the air volume delivered by the air guide 10.

[0048] In addition, since the present invention reduces the flow separation on the leeward side of the air guide plate through the above-described structure, it also avoids unsteady vortex flow and reduces the vortex noise generated by the air guide plate 10.

[0049] Figure 5 The diagram shows the flow field simulation streamlines of a traditional flat plate air guide when the airflow is turned 45°. Figure 6 The diagram shows the flow field simulation streamline of the air guide plate 10 of the present invention when the airflow is turned 45°. Figure 7 The diagram shows the flow field simulation streamlines of a traditional flat plate air guide when the outlet airflow is turned 60°. Figure 8 The diagram shows a simulated streamline of the flow field of the air guide plate 10 of the present invention when the outlet airflow is turned by 60°. Figure 5 and Figure 7 It can be seen that during large-angle turns, the leeward side of a traditional flat-plate air guide plate experiences significant flow separation. This separation zone contains large-scale vortices, reducing the effective flow area and thus generating additional resistance, thereby decreasing the fan's flow rate. However, by... Figure 6 and Figure 8 It can be seen that when the air guide plate 10 of the present invention guides air at a large angle, only the leeward surface 13 of the leading edge has a very small separation zone, which has very little impact on the flow channel cross-section and hardly causes blockage, thereby reducing flow resistance and increasing the flow rate compared with the traditional flat plate air guide plate. Experimental measurements have verified that the air delivery volume of the air guide plate 10 of the present invention is increased by 7% to 10% compared with the plate air guide plate, and the noise is reduced by 1 dB(A) to 1.5 dB(A).

[0050] It should be noted that the windward surface of the aforementioned air guide plate 10 includes the windward surface 12 of the leading edge and the windward surface of the main body 2. The windward surface of the aforementioned air guide plate 10 refers to the surface of the air guide plate 10 that directly faces the airflow, and the normal of the windward surface points in the direction of the airflow source. The leeward surface of the air guide plate 10 refers to the surface of the air guide plate 10 that faces away from the airflow. In addition, the air guide plate 10 of the present invention may sometimes also be referred to as a slatted air guide plate.

[0051] In some implementations, such as Figure 4As shown, in a cross-section perpendicular to the first direction b, the cross-sectional profile of the leading edge 1 at the gap 6 is taken as the first profile 17. The first profile 17 intersects the leeward surface 13 of the leading edge at point O1, and the angle between the tangent of the first profile 17 at point O1 and the tangent of the leeward surface 13 of the leading edge at point O1 is α, where α = 10° to 20°. Preferably, α = 15°.

[0052] In the above example, by setting α to 10° to 20°, the airflow on the leeward side of the leading edge 1 and the airflow at the gap 6 can be nearly parallel when they converge, thereby reducing airflow impact, facilitating smooth air delivery by the guide plate 10, and reducing impact noise. In addition, setting α to 10° to 20° also ensures the structural strength between the first contour 17 and the leeward side of the leading edge 1, avoiding any weakening of structural strength due to small included angles.

[0053] like Figure 4 As shown, the aforementioned first contour 17 is a curve, and the distance between the first contour 17 and the leeward surface 13 of the leading edge gradually increases along the windward direction a of the wind guide plate 10.

[0054] In some implementations, such as Figure 4 As shown, in a cross section perpendicular to the first direction b, the cross section profile of the front edge 1 at the gap 6 is taken as the first profile 17. The first profile 17 and the windward surface 12 of the front edge intersect at point O2, and the angle between the tangent of the first profile 17 at point O2 and the tangent of the windward surface 12 of the front edge at point O2 is 90 degrees. This facilitates processing and allows the airflow to flow more smoothly into the gap 6.

[0055] In some implementations, such as Figure 1-2 As shown, there are two or more of the aforementioned gaps 6, and they are arranged sequentially at intervals along the first direction b on the air guide plate 10. Among them, a rib plate 5 is formed between two adjacent gaps 6 to connect the front edge portion 1 and the main body portion 2.

[0056] In the above example, the stiffening plate 5 serves to fix the relative position of the leading edge 1 and the main body 2 and to provide support. Specifically, the stiffening plate 5 keeps the leading edge 1 and the main body 2 relatively fixed, thereby improving the overall structural stability of the air guide plate 10.

[0057] In some implementations, such as Figure 2 As shown, the aforementioned air guide plate 10 may have a first lug 3 at one end along the first direction b, connecting one end of the leading edge portion 1 and one end of the main body portion 2. The air guide plate 10 may have a second lug 4 at the other end along the first direction b, connecting the other end of the leading edge portion 1 and the other end of the main body portion 2. The first lug 3 is used to connect with the external motor 7, and the second lug 4 is used to connect with the external rotating shaft.

[0058] In the above example, the first hook 3 and the second hook 4 further fix the front edge 1 and the main body 2 relatively, thereby further improving the overall structural stability of the air guide plate 10. In addition, the cooperation of the first hook 3 and the second hook 4 allows the air guide plate 10 to be installed by rotation, thereby making the air guiding angle of the air guide plate 10 adjustable.

[0059] In some implementations, such as Figure 2 As shown, the aforementioned first lug 3 may be provided with a first connecting hole 31, through which the first lug 3 is connected to the output shaft of the external motor 7. The aforementioned second lug 4 may be provided with a second connecting hole 41, through which the second lug 4 is connected to an external rotating shaft. The center lines of the first connecting hole 31 and the second connecting hole 41 coincide.

[0060] In some embodiments, the external motor 7 described above can be a stepper motor, and the external shaft described above can be a locating pin.

[0061] Stepper motor 7 can drive air guide plate 10 to rotate. Stepper motor 7 can drive air guide plate 10 to rotate to a specified angle according to the instructions of the air conditioner main control board. The assembly of air guide plate 10 and indoor unit body is as follows: Figure 9 As shown, the stepper motor 7 is fixed to the housing 9 of the indoor unit. The output shaft of the stepper motor 7 is inserted into the first connecting hole 31 on the first hanging ear 3, so that the rotation of the stepper motor 7 drives the air guide plate 10 to rotate, thereby adjusting the angle of the air guide plate 10. A rotating shaft, such as a positioning pin, passes through the second connecting hole 41 on the second hanging ear 4 and is fixed to the housing 9.

[0062] It should be noted that, in a specific application example, the aforementioned gap 6 extends along the length of the air guide plate 10, and the aforementioned leading edge portion 1 and main body portion 2 are arranged alternately along the width of the air guide plate 10. The aforementioned first hook 3 and second hook 4 are located at both ends of the length of the air guide plate 10.

[0063] In some implementations, such as Figure 9 As shown, the present invention also provides an indoor unit, which may include the air guide plate 10 of any of the above.

[0064] In some implementations, such as Figure 10-11As shown, the aforementioned indoor unit also includes a housing 9, on which a wall-mount bracket 18 is provided. This wall-mount bracket 18 is used to suspend the indoor unit on a wall. The housing 9 has a rear side 91 facing the wall and a front side 92 facing the rear side 91. The housing 9 also has an upper air vent 901 and a lower air vent 902. The aforementioned air guide plate 10 is rotatably disposed at the upper air vent 901, with one end of the air guide plate 10 being a rotating end 10a and the other end being a free end 10b. When the air guide plate 10 is closed, the rotating end 10a of the air guide plate 10 is closer to the rear side 91 than the free end 10b.

[0065] The number of air guide plates 10 can be two or more, and they are arranged alternately from the front 92 to the back 91 at the upwind opening 901. For example... Figure 11 As shown, the aforementioned indoor unit has a bottom air outlet mode. In the bottom air outlet mode, air enters through the aforementioned upper air outlet 901 and exits through the lower air outlet 902. The opening angle of each air guide plate 10 gradually increases from the front 92 to the back 91.

[0066] In the above example, in the down-discharge mode, the air guide vane 10 at the upper air vent 901 does not guide the airflow. Therefore, the intake resistance caused by the air guide vane 10 should be minimized. Specifically, in the down-discharge mode, by gradually increasing the opening angle of each air guide vane 10 from the front 92 towards the back 91, the intake resistance at the upper air vent 901 can be reduced. In detail, during down-discharge, airflow flows in from around the upper air vent 901. Since the back 91 of the indoor unit is against the wall and the top is a ceiling, most of the airflow flows in from the front 92 and the sides, with a small portion flowing in through the gap between the indoor unit and the ceiling. Simulation verification shows that in the down-discharge mode, gradually increasing the opening angle of each air guide vane 10 from the front 92 towards the back 91 increases the consistency of the airflow direction, thereby reducing intake resistance.

[0067] In a specific application example, such as Figure 11 As shown, from the front 92 to the back 91, the aforementioned air guide plates 10 may include a first air guide plate 101, a second air guide plate 102, and a third air guide plate 103 arranged sequentially. In the downward airflow mode, the opening angle of the first air guide plate 101 is 60°–70°, the opening angle of the second air guide plate 102 is 70°–80°, and the opening angle of the third air guide plate 103 is 80°–90°. Preferably, in the downward airflow mode, the opening angle of the first air guide plate 101 is 65°, the opening angle of the second air guide plate 102 is 75°, and the opening angle of the third air guide plate 103 is 85°. Simulation verification shows that these three angles have the best consistency with the airflow streamline direction, thus minimizing resistance.

[0068] In some implementations, such as Figure 10As shown, the aforementioned indoor unit also has an upward air outlet mode. In the upward air outlet mode, the aforementioned downward air outlet 902 receives air and the upward air outlet 901 discharges air. The opening angle of each air guide plate 10 is consistent and is 30° to 45°.

[0069] In the example above, in the top air outlet mode, by making the opening angle of each air guide plate 10 consistent and between 30° and 45°, long-distance air supply can be achieved and condensation from the wind blowing on the roof can be avoided.

[0070] like Figure 10 As shown, a lower air guide plate 8 can be provided at the aforementioned downwind outlet 902. In the upward air outlet mode, the opening angle of the lower air guide plate 8 can be 90 degrees to maximize the opening and increase the air intake.

[0071] In some implementations, such as Figure 10 As shown, the aforementioned indoor unit may further include a reversible axial flow fan 15, which is disposed within the housing 9 and located between the upper air inlet 901 and the lower air inlet 902. The reversible axial flow fan 15, when rotating forward, drives airflow to enter through the lower air inlet 902 and exit through the upper air inlet 901. When rotating in reverse, the reversible axial flow fan 15 drives airflow to enter through the upper air inlet 901 and exit through the lower air inlet 902.

[0072] In some implementations, such as Figure 10 As shown, the aforementioned indoor unit also includes a heat exchanger 14 and a drip tray 16. The heat exchanger 14 is disposed inside the casing 9 and located between the aforementioned upper air vent 901 and the reversible axial flow fan 15. The drip tray 16 is used to receive condensate dripping from the heat exchanger 14.

[0073] like Figure 10 As shown, the aforementioned heat exchanger 14 can be arranged in an inverted V shape. There can be two water receiving trays 16, one of which is located at one end of the lower side of the inverted V-shaped heat exchanger 14, and the other is located at the other end of the lower side of the inverted V-shaped heat exchanger 14.

[0074] It should be noted that the indoor unit mentioned above can sometimes also be called a wall-mounted air conditioner.

[0075] like Figure 12 As shown, in some embodiments, the present invention also provides a method for controlling an indoor unit, which includes the following steps:

[0076] Step S1: Obtain the operating mode of the indoor unit, which includes cooling mode and heating mode.

[0077] Step S2: When the indoor unit is in cooling mode, the indoor unit defaults to controlling the reversible axial flow fan 15 to rotate forward, causing air to be discharged from the top of the indoor unit. During the first distance air delivery, all air guide vanes 10 are controlled to open at a first preset angle, and during the second distance air delivery, all air guide vanes 10 are controlled to open at a second preset angle; wherein the first distance is less than the second distance, and the first preset angle is greater than the second preset angle. In some embodiments, the first distance air delivery can be conventional distance air delivery, and the second distance air delivery can be ultra-long distance air delivery. The first preset angle can be 45°, and the second preset angle can be 30°.

[0078] When the indoor unit is in heating mode, the indoor unit controls the reversible axial flow fan 15 to reverse and controls the air outlet mode of each air guide plate 10 to open, so that the opening angle of each air guide plate 10 gradually increases from the front 92 to the back 91.

[0079] Figure 12 A control flowchart for an indoor unit is shown. After the indoor unit is turned on, it first determines its operating mode. The indoor unit has two operating modes: cooling mode and heating mode, which respectively realize cooling and heating functions. The default air outlet mode for cooling is top air outlet, which utilizes the high density of cold air to create natural circulation in the room. The default air outlet mode for heating is bottom air outlet, which utilizes the low density of hot air to create natural circulation in the room, thereby making the room temperature more uniform.

[0080] The indoor unit can also change the airflow direction according to user needs. After determining the operating mode and airflow direction, adjust the air guide vanes 10 at the upper air vent 901 to the specified angle: when airflow is directed upwards, the opening angle of each air guide vane 10 at the upper air vent 901 is the same, and all are between 30° and 45°. When supplying air over extremely long distances, the opening angle of each air guide vane 10 at the upper air vent 901 is 30°; when supplying air over normal distances, the opening angle of each air guide vane 10 is 45°. This completes the control process. When the user issues a new command, it will be executed accordingly.

[0081] For ease of understanding, the overall structure of the present invention will be described below, and its working principle will be explained.

[0082] The main structure of the indoor unit of this invention is as follows: Figure 10-11As shown, its main structure is as follows: (1) The upper air outlet 901 uses a guide plate 10 with three slat configurations. Its function is: when the indoor unit is in the upper air outlet mode, the guide plate 10 rotates to a specified angle to guide the airflow and avoid direct blowing to the roof to generate condensation; (2) The heat exchanger 14 is used as a condenser when heating and as an evaporator when cooling; (3) The casing 9 is the main support structure of the indoor unit; (4) The water tray 16 is used to collect the condensate on the surface of the heat exchanger 14; (5) The reversible axial flow fan 15 is the power source for the airflow of the indoor unit. When the indoor unit is in the upper air outlet mode, the reversible axial flow fan 15 rotates forward; when the indoor unit is in the lower air outlet mode, the reversible axial flow fan 15 rotates in reverse; (7) The lower air guide plate 8 is used to guide the lower air outlet airflow; (8) The wall-mounted bracket is used to hang the indoor unit on the wall.

[0083] The air guide plate 10 of the present invention adopts a slotted airfoil structure. Due to its streamlined shape and slotted overflow, flow separation on the air guide plate 10 is avoided, flow blockage is avoided, and flow resistance is reduced. When the air guide plate 10 is deflected at a large angle in the air outlet mode of the indoor unit, the air volume is almost unaffected, thus increasing the air outlet flow rate. Furthermore, due to the reduction of flow separation, unsteady vortex flow is avoided, and the vortex noise generated by the air guide plate 10 is reduced. Compared with a flat air guide plate, the air outlet flow rate is increased by 7% to 10%, and the noise is reduced by 1 dB(A) to 1.5 dB(A).

[0084] In addition, the indoor unit of the present invention can improve the air supply pattern of existing air conditioners. By changing the rotation direction of the reversible axial flow fan 15 under the user's command, the air inlet and outlet direction of the indoor unit can be changed, avoiding cold air blowing directly into people, improving the large air circulation in the room, and improving the comfort of air conditioning.

[0085] Among them, the present invention solves the problems of high resistance when the traditional air guide plate guides air at a large angle, resulting in a significant reduction in air volume, easy flow separation to form unsteady vortices, flow-induced noise, and poor comfort; and also solves the problem of large vertical temperature difference in the room of traditional single-outlet air conditioner wall-mounted units.

[0086] It will be readily understood by those skilled in the art that, without conflict, the advantageous technical features of the above-mentioned methods can be freely combined and superimposed.

[0087] 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 should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A wind deflector (10) characterised in that: The air deflector (10) is provided with a slit (6) extending along a first direction (b), the slit (6) separates the air deflector (10) into a leading edge portion (1) and a main body portion (2) in a deflection direction (a); the first direction (b) is perpendicular to the deflection direction (a); In a cross section perpendicular to the first direction (b), the cross-sectional profile of the main body portion (2) is a first airfoil profile, the head of the first airfoil profile is located on the side of the main body portion (2) close to the leading edge portion (1), the cross-sectional profile of the leading edge portion (1) outside the slit (6) is the head profile of a second airfoil profile, the included angle of the chord line of the leading edge portion (1) and the chord line of the main body portion (2) is β, the chord length of the leading edge portion (1) is L1, the width of the narrowest part of the slit (6) is L2, and the chord length of the main body portion (2) is L3; Wherein, β = 10°-30°, and L3 = 6L1-10L1, L1 = 2L2-5L2.

2. The air deflector (10) according to claim 1, characterized in that: In a cross section perpendicular to the first direction (b), the cross-sectional profile of the leading edge portion (1) at the slit (6) is a first profile (17), the first profile (17) and the leeward surface (13) of the leading edge portion intersect at point O1, and the included angle of the tangent line of the first profile (17) at point O1 and the tangent line of the leeward surface (13) of the leading edge portion at point O1 is α, α = 10°-20°.

3. The air deflector (10) according to claim 1, characterized in that: In a cross section perpendicular to the first direction (b), the cross-sectional profile of the leading edge portion (1) at the slit (6) is a first profile (17), the first profile (17) and the windward surface (12) of the leading edge portion intersect at point O2, and the included angle of the tangent line of the first profile (17) at point O2 and the tangent line of the windward surface (12) of the leading edge portion at point O2 is 90 degrees.

4. The air deflector (10) according to any one of claims 1-3, characterized in that: The number of slits (6) is two or more, and they are arranged in sequence along the first direction (b) on the air deflector (10); wherein, the two adjacent slits (6) form a web plate (5) connecting the leading edge portion (1) and the main body portion (2).

5. The air deflector (10) according to any one of claims 1-3, characterized in that: One end of the air deflector (10) along the first direction (b) is provided with a first hanging ear (3) connecting one end of the leading edge portion (1) and one end of the main body portion (2), and the other end of the air deflector (10) along the first direction (b) is provided with a second hanging ear (4) connecting the other end of the leading edge portion (1) and the other end of the main body portion (2); wherein, the first hanging ear (3) is used to connect with an external motor (7), and the second hanging ear (4) is used to connect with an external rotating shaft.

6. An indoor unit, characterized by: The air deflector (10) according to any one of claims 1-5.

7. The indoor unit of claim 6, characterized in that: The device includes a housing (9) on which a wall-mounted bracket (18) is provided. The housing (9) has a back side (91) facing a wall and a front side (92) facing the back side (91). The housing (9) also has an upper air vent (901) and a lower air vent (902). A guide plate (10) is rotatably disposed at the upper air vent (901). One end of the guide plate (10) is a rotating end (10a), and the other end is a free end (10b). When the guide plate (10) is closed, the rotating end (10a) of the guide plate (10) is closer to the back side (91) than the free end (10b). The number of air guide plates (10) is two or more, and they are arranged at intervals from the front (92) to the back (91) at the upper air outlet (901); the indoor unit has a down-air outlet mode, in which air enters through the upper air outlet (901) and air exits through the lower air outlet (902), and the opening angle of each air guide plate (10) gradually increases from the front (92) to the back (91).

8. The indoor unit according to claim 7, characterized in that: From the front (92) to the back (91), each of the air guide plates (10) includes a first air guide plate (101), a second air guide plate (102), and a third air guide plate (103) arranged sequentially; wherein, in the downward air outlet mode, the opening angle of the first air guide plate (101) is 60° to 70°, the opening angle of the second air guide plate (102) is 70° to 80°, and the opening angle of the third air guide plate (103) is 80° to 90°.

9. The indoor unit according to claim 7 or 8, characterized in that: The indoor unit also has an upward air outlet mode. In the upward air outlet mode, air enters through the downward air outlet (902) and exits through the upward air outlet (901). The opening angle of each of the air guide plates (10) is consistent and is 30° to 45°.

10. The indoor unit according to claim 7 or 8, characterized by: The indoor unit also includes a reversible axial flow fan (15), which is disposed inside the housing (9) and located between the upper air outlet (901) and the lower air outlet (902); The reversible axial flow fan (15) is used to drive airflow from the downwind port (902) to the upwind port (901) when rotating in the forward direction; the reversible axial flow fan (15) is used to drive airflow from the upwind port (901) to the downwind port (902) when rotating in the reverse direction.

11. A control method of the indoor unit as claimed in claim 10, characterized by: Includes the following steps: Step S1: Obtain the operating mode of the indoor unit, which includes a cooling mode and a heating mode; Step S2: When the indoor unit is in the cooling mode, the indoor unit controls the reversible axial flow fan (15) to rotate forward by default, and controls each of the air guide plates (10) to open at a first preset angle when air is supplied at a first distance, and controls each of the air guide plates (10) to open at a second preset angle when air is supplied at a second distance; wherein, the first distance is less than the second distance, and the first preset angle is greater than the second preset angle; When the indoor unit is in heating mode, the indoor unit controls the reversible axial flow fan (15) to reverse and controls each of the air guide plates (10) to open in the downward air outlet mode.

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