Air outlet structure of air conditioner type range hood and control method of air outlet structure

Abstract

The invention relates to an air outlet structure of an air conditioner type range hood and a control method thereof, the air outlet structure comprises an air outlet frame, the air outlet frame is provided with an air inlet and an air outlet, an air outlet channel is formed in the air outlet frame, air swinging blades are installed at the air outlet, and the air swinging blades comprise inner air swinging blades and outer air swinging blades; the inner air swinging blades are driven by the first driving mechanism to swing, the outer air swinging blades are driven by the second driving mechanism to swing, an outlet of the air outlet channel is divided into an upper air outlet channel and a lower air outlet channel through the inner air swinging blades, and the outer air swinging blades are used for adjusting the air outlet direction. The air outlet structure has the advantages that the air outlet structure can be independently controlled through the double-swing-blade structure and the double-swing-blade structure, different air outlet angles and air volume ratios can be achieved, a user can adjust the suitable air outlet direction, comfort is better, the swing angles of the control method are matched with range hood gear judgment, the effect that cold air does not interfere with oil smoke is achieved, and the service life of the range hood is prolonged. The requirement for comfort of a user is met, and normal use of the range hood is guaranteed.

Description

Technical Field

[0001] The invention relates to a range hood, and in particular to an air outlet structure of an air-conditioning type range hood and a control method thereof. Background Art

[0002] The kitchen is the main place for people to cook, and the quality of the kitchen air environment directly affects the cooking experience. The kitchen is hot in summer and cold in winter, and there is a need for cooling and heating. For this reason, people have invented range hoods with integrated air conditioning functions to cool the kitchen air in summer and provide warm air to the kitchen in winter to improve cooking comfort. The current integrated kitchen air conditioning range hoods generally set the air outlet on the upper edge of the cabinet door, so that the air outlet is embedded in the cabinet, which has better integrity. However, due to the high air outlet and the angle, the cold air cannot reach or blows on the head when standing in front of the range hood, affecting the user's comfort, the cold air effect is poor, and the air outlet distance is far, so that the user perceives a high air outlet temperature and no coolness. In order to have a good human experience, the cold air needs to be blown downwards, because the fast flow rate will cause low local pressure, and the oil smoke will be attracted by the local low pressure and exhaust smoke. The existing solution uses the air outlet guide plate to adjust the wind direction so that the cold air does not interfere with the fume extraction effect when it blows to people, but this degree is strongly correlated with the wind speed, that is, the higher the wind speed, the lower the local pressure, and the angle must be adjusted to avoid affecting the fume extraction effect. The wind speed is related to the air outlet area. Under the condition of a certain air volume, the smaller the air outlet area, the greater the wind speed. This has a certain impact on the appearance of the product. If the air outlet is too wide, the appearance will appear bloated, and if the air outlet is too narrow, the wind speed will be too high and the angle of the air guide plate must be increased, affecting the user experience. The width of the existing air outlet is generally within 500mm, there is no left and right air guide mechanism, the air outlet area is narrow, and the air outlet direction is controlled by the up and down swing of the air guide door, so it is difficult to blow cold air in the left and right directions. In addition, the air outlet frame of the existing air outlet structure needs to be installed separately on the upper edge of the cabinet and cannot be installed together with the whole machine. Summary of the invention

[0003] The first technical problem to be solved by the present invention is to provide an air outlet structure of an air-conditioning type range hood capable of achieving different air outlet angles and air volume ratios in view of the above-mentioned existing technical status.

[0004] The second technical problem to be solved by the present invention is to provide a control method for the air outlet structure of an air-conditioning type range hood, which can adjust the swing angle according to different range hood gears, in response to the above-mentioned existing technical status.

[0005] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: the air outlet structure of the air-conditioning type range hood includes an air outlet frame, the air outlet frame has an air inlet and an air outlet, an air outlet channel is formed inside the air outlet frame, and a swing blade is installed at the air outlet, characterized in that: the swing blade includes an inner swing blade and an outer swing blade, the inner swing blade swings under the drive of a first driving mechanism, and the outer swing blade swings under the drive of a second driving mechanism, the outlet of the air outlet channel is divided into an upper air outlet channel and a lower air outlet channel by the inner swing blade, and the outer swing blade is used to adjust the air outlet direction.

[0006] In order to support the inner swing blades and the outer swing blades, an inner support frame and an outer support frame are provided in the air outlet frame, the inner swing blades are supported on the inner support frame, and the outer swing blades are supported on the outer support frame.

[0007] Preferably, the outer swing wind blades are arranged in the lower air outlet channel.

[0008] In order to effectively adjust the air outlet direction, the opening angle γ of the outer swing wind blade relative to the vertical plane of the air outlet satisfies 80°≤γ≤90°.

[0009] Preferably, the inner swing blade includes a first bending portion and a second bending portion that are bent to each other, and the rotating portion of the inner swing blade is arranged between the first bending portion and the second bending portion.

[0010] In order to enable the inner swing blade and the outer swing blade to cooperate effectively, the vertical projection of the second bent portion falls on the outer swing blade.

[0011] More preferably, the mutual bending angle θ between the first bending portion and the second bending portion satisfies 150°≤θ≤170°. The optimal angle is 160°.

[0012] Further preferably, when the inner swing blade is open, the first bending portion is arranged on the inner side of the second bending portion, the first bending portion is inclined downward from the outside to the inside, and the first bending portion divides the outlet of the air outlet channel into the upper air outlet channel and the lower air outlet channel.

[0013] In order to obtain a better air outlet effect, when the inner swing blade is open, the inlet height a of the upper air outlet channel and the inlet height b of the lower air outlet channel satisfy 2b≤a≤4b, and the swing angle β of the second bent portion relative to the upper edge of the outlet of the air outlet frame satisfies -10°≤β≤30°. In the optimal state, θ=160°, β=10° and a=3.4b. At this time, the wind speed is about 1m / s at a height of 1500mm and 700mm in front of the range hood, which is comfortable for the human body and has a good fume extraction effect.

[0014] In order to enable the inner swinging air blade to discharge air, the inner swinging air blade is provided with air outlet holes distributed in a mesh shape.

[0015] In order to achieve windless air outlet when the inner swing fan blades are fully closed, the diameter of the air outlet is 2mm to 4mm.

[0016] In order to adjust the air outlet angle without wind feeling, when the inner swing wind blade is fully closed, the angle α between the central axis of the air outlet and the upper edge of the outlet of the air outlet frame satisfies 5°≤α≤30°.

[0017] In order to individually control the double swing blades, the first driving mechanism is a first stepper motor, and the second driving mechanism is a second stepper motor.

[0018] As a preferred embodiment of any of the above schemes, the air outlet frame, the inner swing air blades and the outer swing air blades are all in the shape of long strips.

[0019] The technical solution adopted by the present invention to solve the above-mentioned second technical problem is: the control method can adjust the swing angles of the inner swing air blades and the outer swing air blades according to the different gears of the range hood, and at each different gear, the inner swing air blades can start the corresponding up and down swinging action.

[0020] Further preferably, the control method comprises the following steps:

[0021] s1. Turn on the cooling mode and determine the range hood position.

[0022] If the range hood is not turned on and only the cooling mode is turned on, go to step s2;

[0023] If the range hood is turned on at low setting, go to step s3;

[0024] If the range hood is turned on at high speed, go to step s4;

[0025] If the range hood is in automatic mode, proceed to step s5;

[0026] s2. The default opening angle of the outer swing wind blade is γ = 90°, and the default opening angle of the inner swing wind blade is β = -10° to increase the downward air flow, and then the up and down swing wind is turned on. The outer swing wind blade maintains the opening angle γ = 90° unchanged, and the swing angle β of the inner swing wind blade satisfies -10°≤β≤30°;

[0027] s3. The default opening angle of the outer swing wind blade is γ = 90°, and the default opening angle of the inner swing wind blade is β = 5°, reducing the downward air flow. Then, the upper and lower swing winds are turned on, and the outer swing wind blade maintains the opening angle γ = 90° unchanged, and the swing angle β of the inner swing wind blade satisfies 5°≤β≤30°;

[0028] s4, the default opening angle of the outer swing wind blade is γ=80°, the default opening angle of the inner swing wind blade is β=5°, and the wind is blown horizontally. Then, the up and down swing wind is turned on, the outer swing wind blade maintains the opening angle γ=80° unchanged, and the swing angle β of the inner swing wind blade satisfies 5°≤β≤30°;

[0029] s5. Determine whether the speed of the range hood is greater than or equal to the set speed;

[0030] If yes, it means that the smoke duct resistance is large and the risk of smoke leakage is high, and the process goes to step s6;

[0031] If not, it means that the smoke duct resistance is small and the risk of smoke leakage is small, and the process goes to step s7;

[0032] s6. The default opening angle of the outer swing wind blade is γ=80°, the default opening angle of the inner swing wind blade is β=5°, the wind is blown horizontally, and then the up and down swing wind is turned on. The outer swing wind blade maintains the opening angle γ=80° unchanged, and the swing angle β of the inner swing wind blade satisfies 5°≤β≤30°;

[0033] s7. The default opening angle of the outer swing wind blade is γ=90°, and the default opening angle of the inner swing wind blade is β=5°, reducing the downward air outlet. Then, turn on the up and down swing wind, the outer swing wind blade maintains the opening angle γ=90° unchanged, and the swing angle β of the inner swing wind blade satisfies 5°≤β≤30°.

[0034] Compared with the prior art, the advantages of the present invention are: the air outlet structure adopts a double swing wind structure, and the double swing blades can be controlled separately to achieve different air outlet angles and air volume ratios. The user can adjust the appropriate air outlet direction for better comfort. The swing wind angle of the control method is combined with the range hood gear position judgment to achieve the effect that the cold air does not interfere with the oil smoke, which not only meets the user's comfort needs, but also ensures the normal use of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A schematic diagram of the structure of the air outlet structure according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic diagram of the structure of an air outlet frame according to an embodiment of the present invention;

[0037] Figure 3 A schematic diagram of the structure of an inner swing wind blade according to an embodiment of the present invention;

[0038] Figure 4 for Figure 3 A schematic plan view of the inner swing wind blade shown;

[0039] Figure 5 It is a structural schematic diagram of the air outlet structure of an embodiment of the present invention in the cooling-only mode;

[0040] Figure 6It is a structural schematic diagram of the air outlet structure of an embodiment of the present invention when the range hood is in a low gear mode;

[0041] Figure 7 It is a structural schematic diagram of the air outlet structure of an embodiment of the present invention when the range hood is in the strong gear mode;

[0042] Figure 8 It is a structural schematic diagram of the air outlet structure in a no-wind mode according to an embodiment of the present invention;

[0043] Fig. 9 is a logic diagram of a control method according to an embodiment of the present invention;

[0044] Fig.10 Schematic diagram of air outlet of an air-conditioning type range hood according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The present invention is further described in detail below with reference to the accompanying drawings.

[0046] like Figures 1 to 4 As shown, the air outlet structure of the air-conditioning range hood of this embodiment includes an air outlet frame 1, which is in the shape of an elongated strip and has an air inlet 11 and an air outlet 12, and an air outlet channel 13 is formed inside the air outlet frame 1. An inner support frame 4 and an outer support frame 5 are installed at the air outlet 12 of the air outlet frame 1, and the inner swinging wind blade 2 is supported on the inner support frame 4, and the outer swinging wind blade 3 is supported on the outer support frame 5, and the inner swinging wind blade 2 and the outer swinging wind blade 3 are both in the shape of an elongated strip. The inner swinging wind blade 2 rotates under the drive of the first driving mechanism, i.e., the first stepper motor 6, and the outer swinging wind blade 3 swings under the drive of the second driving mechanism, i.e., the second stepper motor 7, so that the double swinging blades can be controlled separately.

[0047] The outlet of the air outlet channel 13 is divided into an upper air outlet channel 14 and a lower air outlet channel 15 by the inner swing wind blade 2. The outer swing wind blade 3 is arranged in the lower air outlet channel 15. The inner swing wind blade 2 plays the role of flow diversion and flow equalization, and the outer swing wind blade 3 is used to adjust the air outlet direction. The opening angle γ of the outer swing wind blade 3 relative to the vertical plane of the air outlet 12 satisfies 80°≤γ≤90°.

[0048] The inner swing blade 2 includes a first bending portion 21 and a second bending portion 22 that are bent relative to each other. The rotating portion of the inner swing blade 2 is arranged between the first bending portion 21 and the second bending portion 22. The mutual bending angle θ between the first bending portion 21 and the second bending portion 22 satisfies 150°≤θ≤170°, and the vertical projection of the second bending portion 22 falls on the outer swing blade 3.

[0049] like Figures 5 to 8As shown, when the inner swing blade 2 is open, the first bending portion 21 is arranged on the inner side of the second bending portion 22, and the first bending portion 21 is arranged obliquely downward from the outside to the inside, and the first bending portion 21 separates the outlet of the air outlet channel 13 into an upper air outlet channel 14 and a lower air outlet channel 15. The inlet height a of the upper air outlet channel 14 and the inlet height b of the lower air outlet channel 15 satisfy 2b≤a≤4b, and the purpose of separation is to divert. After diversion, the lower air outlet channel 15 has a small flow rate and a low wind speed, while the upper air outlet channel 14 has a large flow rate and a high wind speed. The wind speed of the lower air outlet channel 15 has a great influence on the oil fume absorbing effect, so it is necessary to divert and reduce the flow rate, so that most of the cold air blows upward, and a small part of the cold air blows downward, so as to reduce the height of the air outlet and meet the purpose of oil fume absorbing effect and comfort at the same time. In this embodiment, the swing angle β of the second bent portion 22 relative to the upper edge of the outlet of the air outlet frame 1 satisfies -10°≤β≤30°. By adjusting different swing angles, the air volume of the upper air outlet channel 14 and the lower air outlet channel 15 can be adjusted.

[0050] The inner swing blade 2 is provided with mesh-shaped air outlet holes 23, and the aperture of the air outlet holes 23 is 2 mm to 4 mm, preferably 3 mm. When the inner swing blade 2 is fully closed, the angle α between the central axis of the air outlet hole 23 and the upper edge of the outlet of the air outlet frame 1 satisfies 5°≤α≤30°. When the inner swing blade 2 is closed, when the cold air is blown out through the air outlet hole 23, the total air volume decreases due to the increase in wind resistance, and the speed of the first stepper motor 6 can be reduced to achieve a windless effect. According to experimental tests, β is optimally 10°, and θ is optimally 160°. When β=10°, θ=160°, a=3.4b. At this time, the wind speed is about 1m / s at a height of 1500mm, 700mm in front of the range hood, which is comfortable for the human body and has a good fume extraction effect.

[0051] like Fig. 9 As shown, the control method of this embodiment can adjust the swing angles of the inner swing blade 2 and the outer swing blade 3 according to the different gears of the range hood, and at each different gear, the inner swing blade 2 can start the corresponding up and down swing action. This control method cooperates with the range hood gear judgment to achieve the effect that the cold wind does not interfere with the oil smoke, which not only meets the user's comfort needs, but also ensures the normal use of the range hood.

[0052] The control method specifically comprises the following steps:

[0053] s1. Turn on the cooling mode and determine the range hood position.

[0054] If the range hood is not turned on and only the cooling mode is turned on, go to step s2;

[0055] If the range hood is turned on at low setting, go to step s3;

[0056] If the range hood is turned on at high speed, go to step s4;

[0057] If the range hood is in automatic mode, proceed to step s5;

[0058] s2, the default opening angle of the outer swing wind blade 3 is γ=90°, the default opening angle of the inner swing wind blade 2 is β=-10° to increase the downward air flow, and then the up and down swing wind is turned on, the outer swing wind blade 3 maintains the opening angle γ=90° unchanged, and the swing angle β of the inner swing wind blade 2 satisfies -10°≤β≤30°;

[0059] s3, the default opening angle of the outer swing wind blade 3 is γ=90°, and the default opening angle of the inner swing wind blade 2 is β=5°, reducing the downward air flow. Then, the up and down swing wind is turned on, the outer swing wind blade 3 maintains the opening angle γ=90° unchanged, and the swing angle β of the inner swing wind blade 2 satisfies 5°≤β≤30°;

[0060] s4, the default opening angle of the outer swing wind blade 3 is γ=80°, the default opening angle of the inner swing wind blade 2 is β=5°, and the wind is blown horizontally. Then, the up and down swing wind is turned on, the outer swing wind blade 3 maintains the opening angle γ=80° unchanged, and the swing angle β of the inner swing wind blade 2 satisfies 5°≤β≤30°;

[0061] s5. Determine whether the speed of the range hood is greater than or equal to the set speed, such as 800 rpm;

[0062] If yes, it means that the smoke duct resistance is large and the risk of smoke leakage is high, and the process goes to step s6;

[0063] If not, it means that the smoke duct resistance is small and the risk of smoke leakage is small, and the process goes to step s7;

[0064] s6, the default opening angle of the outer swing wind blade 3 is γ=80°, the default opening angle of the inner swing wind blade 2 is β=5°, horizontal air blowing, then the up and down swing wind is turned on, the outer swing wind blade 3 maintains the opening angle γ=80° unchanged, and the swing angle β of the inner swing wind blade 2 satisfies 5°≤β≤30°;

[0065] s7, the default opening angle of the outer swing wind blade 3 is γ = 90°, and the default opening angle of the inner swing wind blade 2 is β = 5°, reducing the downward air flow. Then, the upper and lower swing winds are turned on, and the outer swing wind blade 3 maintains the opening angle γ = 90° unchanged, and the swing angle β of the inner swing wind blade 2 satisfies 5°≤β≤30°

[0066] Wherein, step s2 refers to Figure 5 As shown, step s3 see Figure 6 As shown, step s4 refers to Figure 7 As shown, in the windless air outlet mode, see Figure 8 shown.

[0067] like Fig.10As shown, the air outlet structure is installed at the lower part of the front side of the casing of the air-conditioning type range hood 8, has good integrity, does not need to be fixed to the cabinet, is simpler to install, and has a lower air outlet position. Through the double swing blade air guide, different air outlet angles and air volume ratios can be achieved, which provides better comfort. The width of the air outlet is roughly the same as the width of the range hood, and can cover a wider air outlet range.

[0068] In addition to being applied to range hoods, the air outlet structure of this embodiment can also be applied to an indoor unit of an air conditioner as an air outlet for an air conditioner, and can also be applied to other machines that require air outlet.

Claims

1. An air outlet structure of an air-conditioning type range hood, comprising an air outlet frame (1), the air outlet frame (1) having an air inlet (11) and an air outlet (12), an air outlet channel (13) being formed inside the air outlet frame (1), and an oscillating blade being installed at the air outlet (12), characterized in that: The swing blades include an inner swing blade (2) and an outer swing blade (3), wherein the inner swing blade (2) swings under the drive of a first drive mechanism, and the outer swing blade (3) swings under the drive of a second drive mechanism, and the outlet of the air outlet channel (13) is divided into an upper air outlet channel (14) and a lower air outlet channel (15) by the inner swing blade (2), and the outer swing blade (3) is used to adjust the air outlet direction.

2. The air outlet structure of the air-conditioning type range hood according to claim 1, characterized in that: An inner support frame (4) and an outer support frame (5) are provided in the air outlet frame (1); the inner swing blades (2) are supported on the inner support frame (4), and the outer swing blades (3) are supported on the outer support frame (5).

3. The air outlet structure of the air-conditioning type range hood according to claim 1, characterized in that: The outer swing wind blades (3) are arranged in the lower air outlet channel (15).

4. The air outlet structure of the air-conditioning type range hood according to claim 3, characterized in that: The opening angle γ of the outer swing wind blade (3) relative to the vertical plane of the air outlet (12) satisfies 80°≤γ≤90°.

5. The air outlet structure of the air-conditioning type range hood according to claim 4, characterized in that: The inner swing blade (2) comprises a first bending portion (21) and a second bending portion (22) which are bent to each other, and the rotating portion of the inner swing blade (2) is arranged between the first bending portion (21) and the second bending portion (22).

6. The air outlet structure of the air-conditioning type range hood according to claim 5, characterized in that: The vertical projection of the second bent portion (22) falls on the outer swing blade (3).

7. The air outlet structure of the air-conditioning type range hood according to claim 6, characterized in that: The mutual bending angle θ of the first bending portion (21) and the second bending portion (22) satisfies 150°≤θ≤170°.

8. The air outlet structure of the air-conditioning type range hood according to claim 7, characterized in that: When the inner swing blade (2) is in an open state, the first bending portion (21) is arranged on the inner side of the second bending portion (22), the first bending portion (21) is arranged to be inclined downward from the outside to the inside, and the first bending portion (21) divides the outlet of the air outlet channel (13) into the upper air outlet channel (14) and the lower air outlet channel (15).

9. The air outlet structure of the air-conditioning type range hood according to claim 8, characterized in that: When the inner swing blade (2) is in the open state, the inlet height a of the upper air outlet channel (14) and the inlet height b of the lower air outlet channel (15) satisfy 2b≤a≤4b, and the swing angle β of the second bent portion (22) relative to the upper edge of the outlet of the air outlet frame (1) satisfies -10°≤β≤30°.

10. The air outlet structure of the air-conditioning type range hood according to claim 1, characterized in that: The inner swing blades (2) are provided with air outlet holes (23) distributed in a mesh pattern.

11. The air outlet structure of the air-conditioning type range hood according to claim 10, characterized in that: The diameter of the air outlet hole (23) is 2 mm to 4 mm.

12. The air outlet structure of the air-conditioning type range hood according to claim 10, characterized in that: When the inner swing blade (2) is in a fully closed state, the angle α between the central axis of the air outlet hole (23) and the upper edge of the outlet of the air outlet frame (1) satisfies 5°≤α≤30°.

13. The air outlet structure of the air-conditioning type range hood according to claim 1, characterized in that: The first driving mechanism is a first stepping motor (6), and the second driving mechanism is a second stepping motor (7).

14. The air outlet structure of the air-conditioning type range hood according to any one of claims 1 to 13, characterized in that: The air outlet frame (1), the inner swing air blades (2) and the outer swing air blades (3) are all in the shape of long strips.

15. A method for controlling an air outlet structure of an air-conditioning range hood, characterized in that: The control method is applied to the air outlet structure described in claim 9, and the control method can adjust the swing angles of the inner swing air blade (2) and the outer swing air blade (3) according to different gears of the range hood, and at each different gear, the inner swing air blade (2) can start the corresponding up and down swing action.

16. The control method according to claim 15, characterized in that The steps include: s1. Turn on the cooling mode and determine the range hood position. If the range hood is not turned on and only the cooling mode is turned on, go to step s2; If the range hood is turned on at low setting, go to step s3; If the range hood is turned on at high speed, go to step s4; If the range hood is in automatic mode, proceed to step s5; s2, the default opening angle of the outer swing wind blade (3) is γ = 90°, the default opening angle of the inner swing wind blade (2) is β = -10° to increase the downward air flow, and then the up and down swing wind is turned on, the outer swing wind blade (3) maintains the opening angle γ = 90° unchanged, and the swing angle β of the inner swing wind blade (2) satisfies -10°≤β≤30°; s3, the default opening angle of the outer swing wind blade (3) is γ = 90°, and the default opening angle of the inner swing wind blade (2) is β = 5°, reducing the downward air flow. Then, the upper and lower swing winds are turned on, the outer swing wind blade (3) maintains the opening angle γ = 90° unchanged, and the swing angle β of the inner swing wind blade (2) satisfies 5°≤β≤30°; s4, the default opening angle of the outer swing wind blade (3) is γ=80°, the default opening angle of the inner swing wind blade (2) is β=5°, and the wind is blown horizontally. Then, the upper and lower swing winds are turned on, the outer swing wind blade (3) maintains the opening angle γ=80° unchanged, and the swing angle β of the inner swing wind blade (2) satisfies 5°≤β≤30°; s5. Determine whether the speed of the range hood is greater than or equal to the set speed; If yes, it means that the smoke duct resistance is large and the risk of smoke leakage is high, and the process goes to step s6; If not, it means that the smoke duct resistance is small and the risk of smoke leakage is small, and the process goes to step s7; s6, the default opening angle of the outer swing wind blade (3) is γ=80°, the default opening angle of the inner swing wind blade (2) is β=5°, the wind is blown horizontally, and then the up and down swing wind is turned on. The outer swing wind blade (3) maintains the opening angle γ=80° unchanged, and the swing angle β of the inner swing wind blade (2) satisfies 5°≤β≤30°; s7. The default opening angle of the outer swing wind blade (3) is γ=90°, and the default opening angle of the inner swing wind blade (2) is β=5°, reducing the downward air outlet. Then, the up and down swing wind is turned on, and the outer swing wind blade (3) maintains the opening angle γ=90° unchanged, and the swing angle β of the inner swing wind blade (2) satisfies 5°≤β≤30°.

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