Fan and fan control method

Abstract

A fan (100), comprising: an air duct assembly (1), wherein the air duct assembly (1) is provided with an air guide channel (11), and the air guide channel (11) is provided with an air outlet (13); a first fan blade assembly (2) and a second fan blade assembly (3), wherein the first fan blade assembly (2) and the second fan blade assembly (3) are respectively arranged spaced from each other in the air guide channel (11) so as to supply air towards the air outlet (13), and the first fan blade assembly (2) consists of centrifugal fan blades; and an air guide member (4), wherein the air guide member (4) is internally sleeved on the first fan blade assembly (2) and disposed in the air guide channel (11), and the air guide member (4) is configured to guide airflows thrown out by the centrifugal fan blades towards the air outlet (13). The fan has an increased flow velocity and an extended air supply distance, is not prone to shaking, and has good stability and low noise.

Description

Fan and fan control method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application "Fan and Fan Control Method" with application number 202410198986.1 and application date of February 22, 2024, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application belongs to the technical field of household appliances, and specifically relates to a fan and a method for controlling the fan. Background Art

[0004] A fan is a household appliance that uses the rotation of fan blades to drive air flow. It is mainly used for cooling down and circulating air.

[0005] In related art, when a fan's blades rotate, the tilted blades spin, driving air in the axial direction. However, the air directly propelled by the blades not only has momentum along the axial direction but also has momentum perpendicular to the axis of rotation, forming a spiral, forward-flowing airflow. This spiral airflow continuously diffuses radially outward as it advances. As the airflow disperses, its cross-section increases, dramatically increasing the resistance encountered during axial motion and limiting the axial airflow distance. Summary of the Invention

[0006] To this end, the present application proposes a fan that performs secondary acceleration of the air through the cooperation of a first fan blade assembly and a second fan blade assembly, thereby increasing the flow rate of the fan's air outlet and extending the air supply distance of the fan's air outlet; and reducing the fan's noise through centrifugal fan blades.

[0007] This application also proposes a fan control method.

[0008] According to the fan of the embodiment of the present application, it includes: an air duct assembly, the air duct assembly is provided with an air guide channel, and the air guide channel is provided with an air inlet and an air outlet; a first fan blade assembly and a second fan blade assembly, the first fan blade assembly and the second fan blade assembly are respectively arranged in the air guide channel at intervals to supply air toward the air outlet, and the first fan blade assembly is a centrifugal fan blade; an air guide member, the air guide member is outermostly disposed on the outside of the first fan blade assembly and is provided in the air guide channel, and the air guide member is configured to guide the airflow thrown out by the centrifugal fan blade toward the air outlet.

[0009] According to the fan of the embodiment of the present application, the air is accelerated secondary through the cooperation of the first fan blade assembly and the second fan blade assembly, thereby increasing the flow rate of the fan's air outlet and extending the air supply distance of the fan's air outlet; the first fan blade assembly is a centrifugal fan blade, the structure of the centrifugal fan blade is relatively stable, and the possibility of the centrifugal fan blade shaking when rotating is low, thereby improving the stability of the fan when working, and the noise generated by the centrifugal fan blade during operation is low, thereby reducing the noise pollution when the fan is in use.

[0010] Optionally, the first fan blade assembly is located in front of the second fan blade assembly, the first fan blade assembly includes blades with a diameter of d, and the second fan blade assembly includes blades with a diameter of D, wherein d is smaller than D.

[0011] Optionally, the second fan blade assembly is an axial flow fan blade.

[0012] Optionally, d / D satisfies: 0.4≤d / D≤0.9.

[0013] Optionally, the flow area of ​​at least part of the air guide gradually increases in the direction toward the air outlet.

[0014] Optionally, the first fan blade assembly includes: a hub and a plurality of centrifugal blades arranged on the hub, the plurality of centrifugal blades are arranged at intervals around the hub, and in the radial direction of the first fan blade assembly, the centrifugal blades extend away from the hub to drive air radially outward.

[0015] Optionally, the fan further includes: an air outlet mesh cover arranged at the air outlet, the air outlet mesh cover including an air gathering part and an air dispersion part, the air dispersion part being arranged radially outside the air gathering part, the air gathering part being configured to guide the airflow to gather in the direction of the rotation center axis of the centrifugal fan blade, and the air dispersion part being configured to guide the airflow to diffuse in the direction away from the rotation center axis of the centrifugal fan blade.

[0016] Optionally, the end of the air guide member is arranged opposite to the wind gathering part; and / or the end of the air guide member stops at the air outlet mesh cover.

[0017] Optionally, the wind dispersing portion includes a plurality of first grille bars spaced apart along the circumferential direction, and in a cross section parallel to the rotation center axis, a first connecting line between the wind outlet end and the windward end of the first grille bar forms an angle α with the rotation center axis.

[0018] Optionally, the second fan blade assembly is an axial flow fan blade, and in the cross section, the inclination direction of the blades of the axial flow fan blade is opposite to the inclination direction of the first grille bar.

[0019] Optionally, the first grille bar includes a windward end with a thickness of w1 and an exhaust end with a thickness of w2, wherein w1 and w2 satisfy: 1.5mm≤w1≤5mm, 1.5mm≤w2≤5mm; and / or, the width of the first grille bar is L, and L satisfies: 4mm≤L≤15mm.

[0020] Optionally, the air concentrating portion is provided with a plurality of second grille bars arranged at intervals, and each of the second grille bars is provided with a first guide surface for guiding the air to move in a direction parallel to the rotation center axis of the centrifugal fan blade.

[0021] Optionally, the second grid bars are configured as arc-shaped grid bars, and a plurality of the arc-shaped grid bars are distributed at intervals along the circumferential direction.

[0022] According to a fan control method according to an embodiment of the present application, the fan is the fan described in the above technical solution, and the second fan blade assembly is an axial flow fan blade. The control method includes:

[0023] Controlling the rotation speed of the first fan blade assembly to be greater than the rotation speed of the second fan blade assembly to control the fan to be in a wind gathering mode;

[0024] The rotation speed of the first fan blade assembly is controlled to be lower than the rotation speed of the second fan blade assembly, so as to control the fan to be in the wind dispersion mode.

[0025] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become obvious from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0027] FIG1 is a schematic diagram 1 of a fan according to an embodiment of the present application;

[0028] FIG2 is a second schematic diagram of a fan according to an embodiment of the present application;

[0029] FIG3 is an exploded view of a fan head portion of a fan according to an embodiment of the present application;

[0030] FIG4 is a first cross-sectional view of a fan according to an embodiment of the present application;

[0031] FIG5 is a schematic diagram of a first fan blade assembly and a second fan blade assembly;

[0032] FIG6 is a schematic diagram of the air outlet grille;

[0033] FIG7 is a second schematic diagram of the air outlet grille;

[0034] FIG8 is a cross-sectional view taken along line AA in FIG7;

[0035] FIG9 is a second cross-sectional view of a fan according to an embodiment of the present application;

[0036] FIG10 is a schematic diagram of a fan control method.

[0037] Figure markings: 100, fan; 1, air duct assembly; 11, air guide channel; 12, air inlet; 13, air outlet; 14, first channel; 15, second channel; 2, first blade assembly; 21, first motor; 22, hub; 23, centrifugal blade; 24, first annular structure; 25, second annular structure; 3, second blade assembly; 31, second motor; 4, air guide; 5, mounting bracket; 6, air outlet mesh cover; 61, wind gathering part; 611, second grille bar; 6111, first guide surface; 62, wind dispersing part; 621, first grille bar; 6211, windward end; 6212, exhaust end; 63, first positioning member; 64, second positioning member; 65, third positioning member. DETAILED DESCRIPTION

[0038] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0039] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0040] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0041] A fan 100 according to an embodiment of the present application will be described below with reference to FIG. 1 to FIG. 10 .

[0042] 1, 2, and 3, a fan 100 according to an embodiment of the present application includes an air duct assembly 1, the air duct assembly 1 being provided with an air guide channel 11, the air guide channel 11 being provided with an air inlet 12 and an air outlet 13. A first blade assembly 2 and a second blade assembly 3 are provided within the air guide channel 11, and the first blade assembly 2 and the second blade assembly 3 are spaced apart in a direction toward the air outlet 13, and both the first blade assembly 2 and the second blade assembly 3 are configured to deliver air toward the air outlet 13.

[0043] The first blade assembly 2 and the second blade assembly 3 are both used to supply air toward the air outlet 13. When the fan 100 is working, the first blade assembly 2 rotates to drive the air flow and accelerates the air once. The second blade assembly 3 rotates to drive the air flow and also accelerates the air once. That is to say, the first blade assembly 2 and the second blade assembly 3 cooperate to accelerate the air twice, which increases the flow rate of the air discharged by the fan 100, increases the air volume of the air discharged by the fan 100, and extends the air supply distance of the air discharged by the fan 100.

[0044] The first fan blade assembly 2 is a centrifugal fan blade, and the fan 100 also includes an air guide member 4, which is arranged on the outside of the first fan blade assembly 2 and in the air guide channel 11. The air guide member 4 is configured to guide the airflow thrown out by the centrifugal fan blade toward the air outlet 13.

[0045] According to the fan 100 of the embodiment of the present application, the air is accelerated secondary through the cooperation of the first fan blade assembly 2 and the second fan blade assembly 3, thereby increasing the flow rate of the air discharged by the fan 100 and extending the air supply distance of the air discharged by the fan 100; the first fan blade assembly 2 is a centrifugal fan blade, the structure of the centrifugal fan blade is relatively stable, and the possibility of the centrifugal fan blade shaking when rotating is low, thereby improving the stability of the fan 100 during operation, and the noise generated by the centrifugal fan blade during operation is low, thereby reducing the noise pollution when the fan 100 is in use.

[0046] In some embodiments, the flow area of ​​at least part of the air guide 4 gradually increases in the direction toward the air outlet 13 , so that the air guide 4 can guide the air thrown by the centrifugal fan blades toward the air outlet 13 .

[0047] In some specific embodiments, the air guide 4 is constructed as a cylindrical structure with a cross-section gradually increasing toward the air outlet 13 .

[0048] The air guide member 4 in the above technical solution has a simple structure, which reduces the cost of the air guide member 4, that is, reduces the cost of the fan 100.

[0049] In some embodiments, the first fan blade assembly 2 is a centrifugal fan blade, and the second fan blade assembly 3 is an axial flow fan blade. The centrifugal fan blade is arranged on the side of the axial flow fan blade facing the air outlet 13, and the outer side of the centrifugal fan blade is provided with an air guide 4.

[0050] When fan 100 is operating, the axial flow blades drive air toward the centrifugal blades, which throw the air toward the air guide 4. The air guide 4 guides the air to be discharged through the air outlet 13. The axial flow blades and the centrifugal blades cooperate to accelerate the air twice, thereby increasing the wind speed of the fan 100 and extending the air supply distance of the fan 100.

[0051] In the above embodiment, the centrifugal fan blades are arranged on the side of the axial flow fan blades facing the air outlet 13. In other embodiments, the axial flow fan blades may also be arranged on the side of the centrifugal fan blades facing the air outlet 13. As long as the first fan blade assembly 2 and the second fan blade assembly 3 cooperate to accelerate the air twice, it is sufficient.

[0052] In some other embodiments, the first fan blade assembly 2 and the second fan blade assembly 3 are both centrifugal fan blades, and two air guide members 4 are provided, and the two air guide members 4 are respectively outer-mounted on the two centrifugal fan blades.

[0053] When the fan 100 assembly is working, the centrifugal blades cooperate with the corresponding air guide 4 to drive the air toward the air outlet 13. The two centrifugal blades cooperate to accelerate the air twice, thereby increasing the wind speed of the fan 100 and extending the air supply distance of the fan 100.

[0054] Referring to Figures 3, 4 and 5, in some embodiments, the first fan blade assembly 2 is a centrifugal fan blade, the second fan blade assembly 3 is an axial flow fan blade, the first fan blade assembly 2 is located in front of the second fan blade assembly 3, the first fan blade assembly 2 includes fan blades with a diameter of d, and the second fan blade assembly 3 includes fan blades with a diameter of D, where d is less than D.

[0055] When the fan 100 is working, the second fan blade assembly 3 rotates to drive the air to flow toward the first fan blade assembly 2. Because the diameter of the first fan blade assembly 2 is smaller than the diameter of the second fan blade assembly 3, a part of the air blown to the first fan blade assembly 2 by the second fan blade assembly 3 is accelerated by the first fan blade assembly 2 and flows to the air outlet 13, and the other part of the air blown to the first fan blade assembly 2 by the second fan blade assembly 3 flows to the air outlet 13 from the peripheral side of the air guide 4.

[0056] When the fan 100 blows out air, the first fan blade assembly 2 can perform secondary acceleration on part of the air blown out by the second fan blade assembly 3, thereby increasing the flow rate of part of the air, so that part of the air blown out by the fan 100 can be blown farther, extending the air supply distance of the fan 100; and the other part of the air blown out by the second fan blade assembly 3 can bypass the air guide 4 and flow directly to the air outlet 13, forming a scattered soft wind.

[0057] Through the above technical solution, the fan 100 can not only have the function of gathering wind with a long air supply distance, but also have the function of dispersing soft wind with a large air supply area, thereby improving the practicality of the fan 100.

[0058] In some specific embodiments, a mounting bracket 5 is provided in the air guide channel 11, and a first motor 21 is provided on the side of the mounting bracket 5 facing the air outlet 13, and the output shaft of the first motor 21 is connected to the first fan blade assembly 2 for driving the first fan blade assembly 2 to rotate; a second motor 31 is provided on the side of the mounting bracket 5 facing the air inlet 12, and the output shaft of the second motor 31 is connected to the second fan blade assembly 3 for driving the second fan blade assembly 3 to rotate, and the first fan blade assembly 2 and the second fan blade assembly 3 are coaxially arranged.

[0059] Through the above technical solution, the first fan blade assembly 2 and the second fan blade assembly 3 are independently controlled by two motors, so that the speed of the first fan blade assembly 2 and the second fan blade assembly 3 can be adjusted independently, thereby improving the selectivity of the use of the fan 100, and the user can control the speed of the two fan blades separately according to his or her preferences.

[0060] In some embodiments, the fan 100 has a wind gathering mode and a wind dispersion mode. In the wind gathering mode, the rotation speed of the first fan blade assembly 2 is higher than the rotation speed of the second fan blade assembly 3, so that most of the air blown out by the second fan blade assembly 3 is blown out after being accelerated twice by the first fan blade assembly 2. The fan 100 has a high air outlet speed and a small air outlet area.

[0061] In the wind dispersion mode, the rotation speed of the first fan blade assembly 2 is lower than that of the second fan blade assembly 3, so that most of the air blown out by the second fan blade assembly 3 bypasses the air guide 4 and is blown out. While moving forward in a spiral, it spreads radially, resulting in a large air outlet area and low speed. At the same time, the first fan blade assembly 2 rotates to supplement the air outlet in the central area.

[0062] Through the above technical solution, the user can selectively use the wind gathering mode or the wind dispersing mode, thereby improving the practicality of the fan 100.

[0063] In some further embodiments, the first fan blade assembly 2 is located in front of the second fan blade assembly 3, the first fan blade assembly 2 includes blades with a diameter of d, the second fan blade assembly 3 includes blades with a diameter of D, and d / D satisfies: 0.4≤d / D≤0.9.

[0064] If d / D is less than 0.4, the diameter of the first fan blade assembly 2 will be too small, and the amount of air blown out by the first fan blade assembly 2 will be too small, resulting in poor air outlet effect of the fan 100 in the wind gathering mode; if d / D is greater than 0.9, the gap between the air guide 4 and the air guide channel 11 will be too small, and too little air can bypass the air guide 4, resulting in poor air outlet effect of the fan 100 in the wind dispersion mode.

[0065] In the embodiment of the present application, d / D satisfies: 0.4≤d / D≤0.9. The diameter of the first blade assembly 2 is set within a reasonable range, so that the fan 100 has a better air outlet effect in both the wind gathering mode and the wind dispersing mode.

[0066] In some specific embodiments, d / D is 0.4. In some other embodiments, d / D may also be other values ​​such as 0.5, 0.7, 0.8, or 0.9.

[0067] 4 , in some embodiments, the first fan blade assembly 2 includes a hub 22 and a plurality of centrifugal blades 23 disposed on the hub 22. The plurality of centrifugal blades 23 are spaced apart around the hub 22. In the radial direction of the first fan blade assembly 2, the centrifugal blades 23 extend away from the hub 22 to drive air radially outward. An air guide 4 is disposed outside the plurality of centrifugal blades 23. The hub 22 is connected to the first motor 21. When the fan 100 is operating, the first motor 21 drives the hub 22 to rotate, and the hub 22 drives the centrifugal blades 23 to rotate to drive air radially outward from the first fan blade assembly 2.

[0068] In some specific embodiments, the first fan blade assembly 2 further includes: a first annular structure 24 and a second annular structure 25. The first annular structure 24 is externally mounted on and connected to the hub 22, and the plurality of centrifugal blades 23 are disposed on a side of the first annular structure 24 away from the hub 22. The second annular structure 25 is disposed on the rear side of the first annular structure 24, and the centrifugal blades 23 are connected between the first annular structure 24 and the second annular structure 25 to enhance the stability of the centrifugal blades 23.

[0069] The main body of the first motor 21 is disposed between the first annular structure 24 and the second annular structure 25, and the drive shaft of the first motor 21 is connected to the hub 22. By disposing the main body of the first motor 21 between the first annular structure 24 and the second annular structure 25, the utilization rate of the internal space of the fan 100 is improved, the axial thickness of the fan 100 is effectively reduced, and the space occupied by the fan 100 in the room is reduced.

[0070] The second annular structure 25 is spaced apart from the first motor 21 to form an air inlet area on the side of the first blade assembly 2 facing the second blade assembly 3. The second annular structure 25 is spaced apart from the first annular structure 24 to form an air outlet area around the first blade assembly 2. When the fan 100 is in operation, the second blade assembly 3 drives air toward the first blade assembly 2. After the air enters the first blade assembly 2 through the air inlet area, it is driven by the centrifugal blades and discharged from the air outlet area around the first blade assembly 2 to the air guide 4. In the embodiment of the present application, the structure of the first blade assembly 2 is simple, which reduces the cost of the fan 100.

[0071] 4 , 6 and 7 , in some embodiments, the fan 100 further includes an air outlet mesh cover 6 disposed at the air outlet 13, the air outlet mesh cover 6 including an air gathering portion 61 and an air dispersion portion 62, the air dispersion portion 62 being disposed radially outside the air gathering portion 61, the air gathering portion 61 being configured to guide the airflow to gather in the direction of the rotation center axis of the centrifugal fan blades, and the air dispersion portion 62 being configured to guide the airflow to diffuse in a direction away from the rotation center axis of the centrifugal fan blades.

[0072] When fan 100 is operating, first blade assembly 2 and second blade assembly 3 blow out a spiral airflow beam. When the spiral airflow beam passes through air outlet mesh cover 6, a portion passes through air gathering portion 61, and another portion passes through air dispersion portion 62. The airflow passing through air gathering portion 61, under the guidance of air gathering portion 61, converges toward the central axis of rotation of the centrifugal blades, allowing the airflow passing through air gathering portion 61 to flow forward more stably and be transmitted to a greater distance, thereby extending the air supply distance of fan 100. The airflow passing through air dispersion portion 62, under the guidance of air dispersion portion 62, diffuses in a direction away from the central axis of rotation of the centrifugal blades to form a soft and dispersed wind.

[0073] Through the above technical solution, the wind-gathering portion 61 improves the wind-discharging effect of the fan 100 in the wind-gathering mode; and the wind-dispersing portion 62 improves the wind-discharging effect of the fan 100 in the wind-dispersing mode.

[0074] 4 , in some embodiments, the first fan blade assembly 2 is a centrifugal fan blade, and the second fan blade assembly 3 is an axial flow fan blade. The centrifugal fan blade is arranged on the side of the axial flow fan blade facing the air outlet 13, and an air guide 4 is provided on the outer side of the centrifugal fan blade, and the end of the air guide 4 is arranged opposite to the air collecting portion 61.

[0075] Through the above technical solution, the smoothness of the air that has been secondarily accelerated by the centrifugal blades passing through the wind gathering portion 61 is improved, and the air outlet effect of the fan 100 in the wind gathering mode is improved.

[0076] In some further embodiments, the end of the air guide 4 stops at the air outlet mesh cover 6, so that the air outlet end of the air guide channel 11 is divided into two independent channels by the air guide 4. A first channel 14 is formed between the air guide 4 and the inner wall of the air guide channel 11, and a second channel 15 is formed on the inner side of the air guide 4. Because the centrifugal blades are arranged on the inner side of the air guide 4, the air that has been accelerated twice by the centrifugal blades flows to the air outlet mesh cover 6 through the second channel 15; and the air that bypasses the air guide 4 is only the air that has been accelerated once by the first blade assembly 2. The air that has only been accelerated once flows to the air outlet mesh cover 6 through the first flow channel. In the air guide channel 11, the air that has been accelerated once is isolated from the air that has been accelerated twice. This reduces the impact of the air that has been accelerated once on the air that has been accelerated twice in the wind gathering mode, thereby improving the air outlet effect of the fan 100 in the wind gathering mode; it also reduces the impact of the air that has been accelerated twice on the air that has been accelerated once in the wind dispersion mode, thereby improving the air outlet effect of the fan 100 in the wind dispersion mode.

[0077] In some specific embodiments, the maximum diameter of the air guide 4 is less than or equal to the maximum diameter of the wind gathering part 61, so that the air guided by the air guide 4 can be discharged through the wind gathering part 61, thereby improving the air outlet effect of the fan 100 in the wind gathering mode.

[0078] 6 , 7 and 8 , in some embodiments, the wind dispersing portion 62 includes a plurality of first grille bars 621 spaced apart along the circumferential direction, and in a cross section parallel to the central axis of rotation, an angle α is formed between a first connecting line between the air outlet end and the windward end 6211 of the first grille bar 621 and the central axis of rotation.

[0079] Before entering the wind dispersion portion 62, the air flows in a spiral shape, with a tendency to flow in a direction away from the central axis of rotation. When passing through the wind dispersion portion 62, the air flows out from the gap between two adjacent first grille bars 621. Under the guidance of the inclined first grille bars 621, the air flow in a direction away from the central axis of rotation is accelerated, the air diffusion speed is increased, and the air outlet effect of the fan 100 in the wind dispersion mode is improved.

[0080] In some specific embodiments, 5°≤α<90°. The angle α formed between the first connecting line between the air outlet end and the windward end 6211 of the first grille bar 621 and the rotation center axis is limited to not less than 5° to ensure the wind dispersing effect of the first grille bar 621.

[0081] In some specific embodiments, α may be 5°. In other embodiments, α may also be 10°, 20°, 30°, or other angles.

[0082] 9 , in some specific embodiments, the second fan blade assembly 3 is an axial flow fan blade. In a cross section parallel to the central axis of rotation, the inclination direction of the axial flow fan blade is opposite to the inclination direction of the first grille bar 621 .

[0083] When the axial flow fan blades rotate, the inclined fan blades push the air to flow in a direction inclined to the center axis of rotation, so that the air has momentum in a direction parallel to the center axis of rotation and momentum in a direction perpendicular to the center axis of rotation, thereby making the air flow in a spiral shape.

[0084] In an embodiment of the present application, on a cross section parallel to the central axis of rotation, the inclination direction of the axial flow fan blades is opposite to the inclination direction of the first grille bar 621, thereby improving the smoothness of the inclined flow of air pushed by the fan blades into the wind dispersion part 62, and improving the wind outlet effect of the fan 100 in the wind dispersion mode.

[0085] 8 , in some embodiments, the first grille bar 621 includes a windward end 6211 having a thickness w1 and an exhaust end 6212 having a thickness w2 , where w1 and w2 satisfy: 1.5 mm ≤ w1 ≤ 5 mm, and 1.5 mm ≤ w2 ≤ 5 mm.

[0086] Under the influence of the production process, the thickness of the windward end 6211 and the exhaust end 6212 of the first grille bar 621 may be different. The thickness of the windward end 6211 may be greater than the thickness of the exhaust end 6212, or the thickness of the windward end 6211 may be less than the thickness of the exhaust end 6212, or the thickness of the windward end 6211 may be equal to the thickness of the exhaust end 6212.

[0087] If the thickness of first grille bar 621 is less than 1.5 mm, the strength of first grille bar 621 will be low, which may easily damage air outlet grille 6. If the thickness of first grille bar 621 is greater than 5 mm, the wind resistance caused by first grille bar 621 will increase, affecting the air output of fan 100. Therefore, in the embodiment of the present application, w1 and w2 satisfy the following conditions: 1.5 mm ≤ w1 ≤ 5 mm, 1.5 mm ≤ w2 ≤ 5 mm. This ensures that first grille bar 621 has sufficient strength while ensuring that first grille bar 621 effectively guides the air.

[0088] In some specific embodiments, the thickness w1 of the windward end 6211 is 1.5 mm. In other embodiments, the thickness w1 of the windward end 6211 may also be 2 mm, 3 mm, 4.5 mm, 5 mm, or other sizes.

[0089] In some specific embodiments, the thickness w2 of the exhaust end 6212 is 1.5 mm. In other embodiments, the thickness w2 of the exhaust end 6212 can also be other sizes such as 2 mm, 3 mm, 4.5 mm, or 5 mm.

[0090] In some embodiments, the width of the first grid bar 621 is L, and L satisfies: 4 mm ≤ L ≤ 15 mm.

[0091] If the width L of first grille bar 621 is less than 4 mm, the air guiding effect of first grille bar 621 will be poor. If the width L of first grille bar 621 is greater than 15 mm, the wind resistance of first grille bar 621 will be large, affecting the air output of fan 100. Therefore, in the embodiment of the present application, L satisfies the following: 4 mm ≤ L ≤ 15 mm. This reduces the wind resistance caused by first grille bar 621 while ensuring that first grille bar 621 has a better air guiding effect.

[0092] In some specific embodiments, the width L of the first grid bar 621 is 4 mm. In some other embodiments, the width L of the first grid bar 621 may also be 6 mm, 8 mm, 11 mm, 13 mm, 15 mm, or other sizes.

[0093] 6 , in some embodiments, the wind collecting portion 61 is provided with a plurality of second grille bars 611 spaced apart from each other, and each second grille bar 611 is provided with a first guide surface 6111 for guiding the air to move in a direction parallel to the central axis of rotation of the centrifugal fan blade.

[0094] With the above technical solution, when the spiral airflow passes through the air-gathering portion 61, the first guide surface 6111 blocks the airflow from rotating circumferentially in the air outlet grille 6, thereby directing the airflow along the axial direction of the air outlet grille 6. Because the airflow's circumferential rotation is restricted, its radially outward diffusion is restricted. This allows the airflow passing through the air-gathering portion 61 to move forward smoothly, significantly converging the airflow and allowing it to be transmitted over a greater distance, thereby improving the airflow efficiency of the fan 100 in the air-gathering mode.

[0095] In some specific embodiments, a first guide surface 6111 is provided on one side of the second grille bar 611 facing the adjacent second grille bar 611, so that when the airflow passes between the two second grille bars 611, it flows forward under the guidance of the first guide surfaces 6111 on both sides, further improving the effect of the wind gathering part 61 in gathering the airflow.

[0096] In some specific embodiments, the second grid bars 611 are formed as arc-shaped ribs. A plurality of second grid bars 611 are arranged at intervals along the circumferential direction.

[0097] By designing the second grille bars 611 as arcuate ribs, an arcuate air duct is formed between two adjacent second grille bars 611, which matches the spiral airflow beam and allows the spiral airflow beam to more easily enter the air gathering portion 61, thereby reducing wind resistance and improving the airflow gathering effect of the air gathering portion 61. Of course, in other embodiments, the second grille bars 611 can also have other shapes, for example, the second grille bars 611 can also be elongated strips extending radially along the air outlet grille 6, as long as the second grille bars 611 are provided with a first guide surface 6111 that guides the airflow along the axial direction of the air outlet grille 6.

[0098] In some embodiments, the length of the second grille bars 611 in the radial direction of the air outlet grille 6 is greater than the length of the first grille bars 621. By increasing the radial length of the second grille bars 611 in the air outlet grille 6, the area occupied by the air collecting portion 61 is increased, allowing the air outlet grille 6 to transport more air to a farther location, thereby improving the air discharge effect of the fan 100 in the air collecting mode.

[0099] In some specific embodiments, the air outlet grille 6 includes a first positioning member 63 located at the center of a circle, a second positioning member 64 disposed on the first positioning member 63, and a third positioning member 65 disposed on the second positioning member 64, wherein the second positioning member 64 and the third positioning member 65 are both annular structures, and the first positioning member 63, the second positioning member 64, and the third positioning member 65 are coaxially arranged. A wind gathering portion 61 is defined between the first positioning member 63 and the second positioning member 64, wherein the first end of the second grille bar 611 is connected to the first positioning member 63, and the second end of the second grille bar 611 is connected to the second positioning member 64 to ensure the stability of the second grille bar 611; a first air outlet area is defined between the third positioning member 65 and the second positioning member 64, wherein the first grille bar 621 extends radially along the air outlet grille 6, wherein the first end of the first grille bar 621 is connected to the second positioning member 64, and the second end of the first grille bar 621 is connected to the third positioning member 65 to ensure the stability of the first grille bar 621.

[0100] 10 , according to a control method of a fan 100 according to an embodiment of the present application, the fan 100 is the fan 100 in the above technical solution, the first fan blade assembly 2 is a centrifugal fan blade, and the second fan blade assembly 3 is an axial flow fan blade. The control method includes:

[0101] Controlling the rotation speed of the first fan blade assembly 2 to be greater than the rotation speed of the second fan blade assembly 3 to control the fan 100 to be in the wind gathering mode;

[0102] The rotation speed of the first fan blade assembly 2 is controlled to be lower than the rotation speed of the second fan blade assembly 3, so as to control the fan 100 to be in the wind dispersion mode.

[0103] According to the control method of the fan 100 of the embodiment of the present application, in the wind gathering mode, the wind speed of the fan 100 is high and the air supply distance is long. In the wind dispersion mode, the air outlet area of ​​the fan 100 is large. The user can choose to use the wind gathering mode or the wind dispersion mode, which improves the practicality of the fan 100.

[0104] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0105] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A fan, wherein: include: An air duct assembly, wherein the air duct assembly is provided with an air guide channel, and the air guide channel is provided with an air inlet and an air outlet; a first fan blade assembly and a second fan blade assembly, wherein the first fan blade assembly and the second fan blade assembly are respectively arranged in the air guide channel to supply air toward the air outlet, and the first fan blade assembly is a centrifugal fan blade; An air guide member is disposed on the outer side of the first fan blade assembly and in the air guide channel, and the air guide member is configured to guide the airflow thrown out by the centrifugal fan blades toward the air outlet.

2. The fan according to claim 1, wherein The first fan blade assembly is located in front of the second fan blade assembly. The first fan blade assembly includes blades with a diameter of d, and the second fan blade assembly includes blades with a diameter of D, wherein d is smaller than D.

3. The fan according to claim 2, wherein d / D satisfies: 0.4≤d / D≤0.

9.

4. The fan according to any one of claims 1 to 3, wherein: The second fan blade assembly is an axial flow fan blade.

5. The fan according to any one of claims 1 to 4, wherein: The flow area of ​​at least part of the air guide gradually increases in the direction toward the air outlet.

6. The fan according to any one of claims 1 to 5, wherein: The first fan blade assembly includes: a hub and a plurality of centrifugal blades arranged on the hub, the plurality of centrifugal blades are arranged at intervals around the hub, and in the radial direction of the first fan blade assembly, the centrifugal blades extend away from the hub to drive air radially outward.

7. The fan according to any one of claims 1 to 6, wherein: Also includes: An air outlet mesh cover is arranged at the air outlet, and the air outlet mesh cover includes a wind gathering part and a wind dispersing part. The wind dispersing part is arranged radially outside the wind gathering part, and the wind gathering part is configured to guide the airflow to gather in the direction of the rotation center axis of the centrifugal fan blade, and the wind dispersing part is configured to guide the airflow to diffuse in the direction away from the rotation center axis of the centrifugal fan blade.

8. The fan according to claim 7, wherein The end of the air guide is arranged opposite to the air gathering portion; And / or, the end of the air guide member stops at the air outlet mesh cover.

9. The fan according to claim 7 or 8, wherein: The wind dispersing portion includes a plurality of first grille bars spaced apart along the circumferential direction. In a cross section parallel to the rotation center axis, a first connecting line between an exhaust end and a windward end of the first grille bar forms an angle α with the rotation center axis.

10. The fan according to claim 9, wherein The second fan blade assembly is an axial flow fan blade. In the cross section, the inclination direction of the blades of the axial flow fan blade is opposite to the inclination direction of the first grille bars.

11. The fan according to claim 9 or 10, wherein: The first grille bar includes a windward end with a thickness of w1 and an exhaust end with a thickness of w2, wherein w1 and w2 satisfy: 1.5 mm ≤ w1 ≤ 5 mm, 1.5 mm ≤ w2 ≤ 5 mm; And / or, the width of the first grid bar is L, and L satisfies: 4mm≤L≤15mm.

12. The fan according to any one of claims 7 to 11, wherein: The wind gathering portion is provided with a plurality of second grille bars arranged at intervals, and each of the second grille bars is provided with a first guide surface for guiding air to move in a direction parallel to the rotation center axis of the centrifugal fan blade.

13. The fan according to claim 12, wherein The second grid bars are configured as arc-shaped grid bars, and a plurality of the arc-shaped grid bars are distributed at intervals along the circumferential direction.

14. A method for controlling a fan, wherein: The fan is a fan according to any one of claims 1 to 13, the second fan blade assembly is an axial flow fan blade, and the control method includes: Controlling the rotation speed of the first fan blade assembly to be greater than the rotation speed of the second fan blade assembly to control the fan to be in a wind gathering mode; The rotation speed of the first fan blade assembly is controlled to be lower than the rotation speed of the second fan blade assembly, so as to control the fan to be in the wind dispersion mode.

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