Fan and fan control method

Abstract

The invention discloses a fan and a fan control method, the fan comprises a first fan blade and a second fan blade, the diameter of the blade tip of the first fan blade is D1, the diameter of the blade tip of the second fan blade is D2, D1 is smaller than D2, the first fan blade is located on the air outlet side of the second fan blade, and the control method comprises the steps that an operation mode instruction is received; when it is judged that the operation mode is the natural wind mode, the first fan blade and the second fan blade are controlled to supply air in the same direction, and the rotating speed of the first fan blade is smaller than or equal to that of the second fan blade; and when it is judged that the operation mode is the wind gathering mode, the first fan blade and the second fan blade are controlled to supply wind in the same direction, and the rotating speed of the first fan blade is larger than that of the second fan blade. According to the control method of the fan, the fan can convey the natural wind and the gathered wind respectively, and meanwhile, the air supply effect of the natural wind and the gathered wind can be guaranteed, so that the working performance of the fan is improved, and the use experience of a user is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to a fan and a control method thereof. Background Art

[0002] Although the existing fans are provided with a natural wind mode, when the wind is blown out in the natural wind mode, generally only the wind speed changes and the blowing area remains unchanged, resulting in a poor blowing effect of the fan, being unable to effectively simulate the natural wind and reducing the user experience.

[0003] At the same time, the existing fans can only achieve a single natural wind mode and cannot achieve a more concentrated air output, resulting in a single air output mode of the fan and being difficult to meet the user's usage requirements. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. For this purpose, the present invention provides a control method for a fan. While enabling the fan to respectively deliver natural wind and concentrated wind, the control method of the fan can also ensure the air supply effects of the natural wind and the concentrated wind, solving the technical problems of the single air output mode and poor air output effect of the existing fans.

[0005] The present invention also aims to provide two other control methods for a fan.

[0006] The present invention also aims to provide a fan that executes the above control method.

[0007] According to the control method of the fan according to an embodiment of the present invention, the fan includes a first fan blade and a second fan blade. The diameter of the tip of the first fan blade is D1, and the diameter of the tip of the second fan blade is D2, where D1 < D2. The first fan blade is located on the air outlet side of the second fan blade. The control method includes: receiving an operation mode instruction; when it is determined that the operation mode is the natural wind mode, controlling the first fan blade and the second fan blade to blow air in the same direction, and the rotation speed of the first fan blade is less than or equal to the rotation speed of the second fan blade; when it is determined that the operation mode is the concentrated wind mode, controlling the first fan blade and the second fan blade to blow air in the same direction, and the rotation speed of the first fan blade is greater than the rotation speed of the second fan blade.

[0008] According to the control method of the fan according to an embodiment of the present invention, by controlling the rotation speeds of the first fan blade and the second fan blade, while ensuring that the fan can respectively deliver natural wind and concentrated wind, the air supply effects of the natural wind and the concentrated wind can also be ensured, thereby improving the working performance of the fan and guaranteeing the user experience.

[0009] In some embodiments, in the natural wind mode, the value range of the ratio of the maximum rotational speed of the second fan blade to the maximum rotational speed of the first fan blade is 1 - 1.8; and / or, in the wind concentrating mode, the value range of the ratio of the maximum rotational speed of the second fan blade to the maximum rotational speed of the first fan blade is 0.5 - 0.6.

[0010] In some embodiments, it is controlled that the minimum rotational speed of the first fan blade in the wind concentrating mode is greater than the maximum rotational speed in the natural wind mode.

[0011] In some embodiments, the value range of the ratio of the minimum rotational speed of the first fan blade in the wind concentrating mode to the maximum rotational speed in the natural wind mode is 1.5 - 6.

[0012] In some embodiments, in the natural wind mode, it is controlled that the rotational speed of the first fan blade reciprocally switches between a first rotational speed and a second rotational speed, and the first rotational speed is greater than the second rotational speed.

[0013] In some embodiments, the first rotational speed is the first target rotational speed of the first fan blade, and the second rotational speed is the starting rotational speed of the first fan blade.

[0014] In some embodiments, in the natural wind mode, it is controlled that the second fan blade switches from a first starting rotational speed to a second target rotational speed within a first set time according to a first set rule, and the second target rotational speed includes a first minimum rotational speed and a first maximum rotational speed.

[0015] In some embodiments, in the wind concentrating mode, it is controlled that the second fan blade switches from a second starting rotational speed to a third target rotational speed within a second set time according to a set rule, the third target rotational speed includes a second minimum rotational speed and a second maximum rotational speed, and the second minimum rotational speed is greater than the first minimum rotational speed.

[0016] In some embodiments, the third target rotational speed is 700 r / min - 800 r / min.

[0017] In some embodiments, in the natural wind mode, first, it is controlled that the second fan blade switches to the second target rotational speed and rotates at the current rotational speed, then it is controlled that the first fan blade first switches to the first rotational speed, and then it is controlled that the first fan blade switches between the first rotational speed and the second rotational speed, and the first rotational speed is greater than the second rotational speed.

[0018] In some embodiments, in the wind concentrating mode, first, it is controlled that the first fan blade switches to a fourth target rotational speed and rotates at the current rotational speed, and then it is controlled that the second fan blade switches to the third target rotational speed and rotates at the current rotational speed.

[0019] In some embodiments, the fan satisfies: 0.4 ≤ D1 / D2 ≤ 0.9.

[0020] In some embodiments, the installation directions of the first fan blade and the second fan blade are opposite, and in the air-gathering mode and the natural wind mode, the rotation directions of the first fan blade and the second fan blade are controlled to be opposite.

[0021] For the control method of the fan according to an embodiment of the present invention, the fan includes a first fan blade and a second fan blade. The diameter of the tip of the first fan blade is D1, and the diameter of the tip of the second fan blade is D2, where D1 < D2. The first fan blade is located on the air outlet side of the second fan blade. The control method includes: controlling the second fan blade to switch to a second target speed and maintain rotation at the current speed; controlling the first fan blade to first switch to a first speed, and then controlling the first fan blade to switch between the first speed and a second speed, where the first speed is greater than the second speed and less than or equal to the second target speed.

[0022] For the control method of the fan according to an embodiment of the present invention, due to the difference in the diameters of the first fan blade and the second fan blade, by first controlling the second fan blade to switch to the second target speed and maintain rotation at the current speed, and then controlling the first fan blade to first switch to the first speed and then switch between the first speed and the second speed, the natural wind outlet of the fan can be realized, and the natural wind blowing effect can be guaranteed, thereby improving the working performance of the fan and ensuring the user experience.

[0023] For the control method of the fan according to an embodiment of the present invention, the fan includes a first fan blade and a second fan blade. The diameter of the tip of the first fan blade is D1, and the diameter of the tip of the second fan blade is D2, where D1 < D2. The first fan blade is located on the air outlet side of the second fan blade. The control method includes: controlling the first fan blade to switch to a fourth target speed and maintain rotation at the current speed, and then controlling the second fan blade to switch to a third target speed and maintain rotation at the current speed, where the fourth target speed is greater than the third target speed.

[0024] For the control method of the fan according to an embodiment of the present invention, due to the difference in the diameters of the first fan blade and the second fan blade, by first controlling the first fan blade to switch to the fourth target speed and maintain rotation at the current speed, and then controlling the second fan blade to switch to the third target speed and maintain rotation at the current speed, the air-gathering outlet of the fan can be realized, and the air-gathering blowing effect can be guaranteed, thereby improving the working performance of the fan and ensuring the user experience.

[0025] The fan according to an embodiment of the present invention includes a controller, and the controller executes the foregoing control method.

[0026] According to the fan of the embodiment of the present invention, by setting a controller to execute the foregoing control method, the fan can deliver natural wind and concentrated wind respectively, and at the same time, the air supply effect of the fan when delivering natural wind and concentrated wind can be ensured, the working performance of the fan can be improved, and the user experience can be guaranteed.

[0027] In some embodiments, the fan further includes a front grille, and the front grille is arranged on the air outlet side of the first fan blade.

[0028] In some embodiments, the front grille includes multiple circles of air outlet areas, and the multiple circles of air outlet areas are arranged in sequence along the radial direction of the front grille; the multiple circles of air outlet areas include an outer circle air outlet area and an inner circle air outlet area, and the guide ribs of the outer circle air outlet area are formed into straight ribs; the guide ribs of the inner circle air outlet area are formed into arc-shaped ribs.

[0029] The additional aspects and advantages of the present invention will become apparent in the following description or be understood through the practice of the present invention. Description of the Drawings

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] Figure 1 is an exploded view of the fan according to some embodiments of the first aspect of the present invention.

[0032] Figure 2 is a front view of the first fan blade and the second fan blade in cooperation according to some embodiments of the present invention.

[0033] Figure 3 is a schematic diagram of the air outlet directions of the first fan blade and the second fan blade when the fan operates in the natural wind mode according to some embodiments of the present invention.

[0034] Figure 4 is a schematic diagram of the air outlet directions of the first fan blade and the second fan blade when the fan operates in the concentrated wind mode according to some embodiments of the present invention.

[0035] Figure 5 is a schematic diagram of the front grille according to some embodiments of the second aspect of the present invention.

[0036] Figure 6 is a front view of the front grille according to some embodiments of the second aspect of the present invention.

[0037] Figure 7 is a flowchart of the control method of the fan according to some embodiments of the present invention.

[0038] Figure 8 is a flowchart of the fan when it operates in the natural wind mode according to some embodiments of the present invention.

[0039] Figure 9 Flow chart of the fan operating in the air-concentrating mode according to some embodiments of the present invention.

[0040] Figure 10 Simulation streamline diagram of the air flow when the fan operates in the air-concentrating mode according to some embodiments of the present invention.

[0041] Figure 11 Simulation cross-sectional velocity distribution diagram of the air flow when the fan operates in the air-concentrating mode according to some embodiments of the present invention.

[0042] Figure 12 Simulation streamline diagram of the air flow when the fan operates in the natural wind mode according to some embodiments of the present invention.

[0043] Figure 13 Simulation cross-sectional velocity distribution diagram of the air flow when the fan operates in the natural wind mode according to some embodiments of the present invention.

[0044] Reference numerals:

[0045] 1000, fan;

[0046] 100, first fan blade;

[0047] 200, second fan blade;

[0048] 300, front grille;

[0049] 310, air outlet area;

[0050] 311, outer ring air outlet area; 3111, straight rib;

[0051] 312, inner ring air outlet area; 3121, arc-shaped rib;

[0052] 400, first motor;

[0053] 500, second motor;

[0054] 600, air guide tube; 610, first mounting portion;

[0055] 700, rear grille. Detailed description of the specific embodiments

[0056] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0057] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention 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 should not be construed as a limitation on the present invention.

[0058] The control method of the fan 1000 according to an embodiment of the present invention will be described below with reference to the accompanying drawings of the specification.

[0059] Among them, in combination with Figure 1 and Figure 2 As shown, the fan 1000 includes a first fan blade 100 and a second fan blade 200. The diameter of the tip of the first fan blade 100 is D1, and the diameter of the tip of the second fan blade 200 is D2, where D1 < D2. The first fan blade 100 is located on the air outlet side of the second fan blade 200. Here, it can be understood that the diameter of the tip of the first fan blade 100 is smaller than the diameter of the tip of the second fan blade 200, and the first fan blade 100 is located on the air outlet side of the second fan blade 200. In this way, the air flowing through the second fan blade 200 can flow towards the first fan blade 100 and reach the first fan blade 100, so as to facilitate the use of the first fan blade 100 to continue to guide the air flow, thereby realizing the use of the first fan blade 100 to change the flow direction, flow velocity, etc. of the air flow to ensure the air outlet effect of the fan 1000.

[0060] It should be noted that the air outlet side of the second fan blade 200 mentioned above can also be understood as the side of the second fan blade 200 close to the air outlet of the fan 1000, that is, the first fan blade 100 is located between the second fan blade 200 and the air outlet of the fan 1000. In this way, when the fan 1000 is used to guide the air, the air outside the fan 1000 can first enter the fan 1000 through the air inlet of the fan 1000, flow through the second fan blade 200 and the first fan blade 100 in sequence, and then be discharged through the air outlet of the fan 1000, so as to facilitate the use of the first fan blade 100 and the second fan blade 200 to cooperate to guide the air and ensure the air outlet effect of the fan 1000.

[0061] It should also be noted that the diameter of the tip of the first fan blade 100 mentioned above can be understood as the diameter of the outer circumferential circle that takes the rotation center of the fan 1000 as the center and is tangent to the outermost end of the first fan blade 100, that is, Figure 2 the D1 shown inFigure 2 D2 shown in

[0062] By setting the diameter of the tip of the first fan blade 100 to be smaller than the diameter of the tip of the second fan blade 200, the first fan blade 100 and the second fan blade 200 can achieve different ranges of air supply, thereby ensuring the air outlet effect of the fan 1000 and realizing rich air outlet modes of the fan 1000.

[0063] In a specific example, the first fan blade 100 with a smaller tip diameter can achieve a small-range air-gathering air outlet effect, and the second fan blade 200 with a larger tip diameter can achieve a large-range air-diffusing air outlet effect, that is, achieve a natural wind air outlet effect, so that the fan 1000 of the present application has a natural wind mode and an air-gathering mode, to enrich the air outlet modes of the fan 1000, meet different usage requirements of users, and improve the user experience.

[0064] Such as Figure 7 As shown, a control method for a fan 1000 according to an embodiment of the present invention includes:

[0065] S1. Receive an operation mode instruction.

[0066] S2. When it is determined that the operation mode is the natural wind mode, control the first fan blade 100 and the second fan blade 200 to supply air in the same direction, and the rotation speed of the first fan blade 100 is less than or equal to the rotation speed of the second fan blade 200.

[0067] Here, it means that when the natural wind mode is running, the rotation speed of the first fan blade 100 is not greater than the rotation speed of the second fan blade 200.

[0068] Among them, the air supply in the same direction mentioned here can be understood as that the first fan blade 100 and the second fan blade 200 simultaneously supply air to the front side, rear side or circumferential side of the fan 1000 to ensure the air supply volume, air supply speed and air supply range of the fan 1000.

[0069] That is to say, when it is determined that the operation mode of the fan 1000 is the natural wind mode, both the first fan blade 100 and the second fan blade 200 rotate. In this way, during the rotation process, the first fan blade 100 and the second fan blade 200 can respectively drive the air flow around themselves to flow, so as to form an air flow with a certain flow rate to achieve air supply in the same direction. And because the rotation speed of the first fan blade 100 is less than or equal to the rotation speed of the second fan blade 200, when the air flow led out by the second fan blade 200 flows towards the first fan blade 100, a part of the air flow will directly flow out from the outer periphery of the first fan blade 100 (as Figure 3 shown), realizing a large-area air outlet of the fan 1000, and the air outlet wind speed is small, thereby realizing the delivery of natural wind, and the other part of the air flow will smoothly flow through the first fan blade 100 (as Figure 3As shown, the first fan blade 100 can be used to supplement the air flow at this time, ensuring the air volume at the radial middle of the fan 1000, and thus ensuring the uniformity of the air output of the fan 1000 in the natural wind mode.

[0070] In summary, by creatively setting the diameter relationship of the tips of the first fan blade 100 and the second fan blade 200 and the rotational speed relationship between the first fan blade 100 and the second fan blade 200, the present application can ensure the uniformity of the air output while realizing the natural wind output, thereby ensuring the air output effect of the fan 1000 in the natural wind mode.

[0071] S3. When it is determined that the operating mode is the air gathering mode, control the first fan blade 100 and the second fan blade 200 to blow air in the same direction, and the rotational speed of the first fan blade 100 is greater than that of the second fan blade 200.

[0072] Here, it means that when it is determined that the operating mode of the fan 1000 is the air gathering mode, both the first fan blade 100 and the second fan blade 200 rotate. During the rotation, the first fan blade 100 and the second fan blade 200 can drive the air flow around themselves respectively, so as to form an air flow with a certain flow rate to realize blowing air in the same direction. And set the rotational speed of the first fan blade 100 to be greater than that of the second fan blade 200, that is, the rotational speed of the second fan blade 200 is lower than that of the first fan blade 100. In this way, when the air flow led out by the second fan blade 200 flows towards the first fan blade 100, most of the air flow will directly flow to the first fan blade 100 (as Figure 4 shown). At this time, the first fan blade 100 with a higher rotational speed can be used to increase the flow rate of the air flow passing through it, thereby increasing the flow speed of the air flow. And because the diameter of the tip of the first fan blade 100 is smaller, the air output area of the air flow passing through the first fan blade 100 can also be reduced, so as to realize the air gathering effect and enable the air flow to be transported to a farther area. In this way, while enabling the fan 1000 to realize the air gathering output, the air output effect of the fan 1000 in the air gathering mode can also be ensured.

[0073] In summary, by creatively setting the diameter relationship of the tips of the first fan blade 100 and the second fan blade 200 and the rotational speed relationship between the first fan blade 100 and the second fan blade 200, the present application can ensure the air output effect of the fan 1000 in the air gathering mode while realizing the air gathering output.

[0074] With the above structural method, the control method of the fan 1000 according to the embodiment of the present invention can adjust the rotational speeds of the first fan blade 100 and the second fan blade 200 to make there be a rotational speed difference between the first fan blade 100 and the second fan blade 200. In this way, while enabling the fan 1000 to output natural wind and gathered wind respectively, the air output effect can be ensured, and at the same time, the adjustment difficulty between the natural wind mode and the air gathering mode of the fan 1000 can be reduced.

[0075] In other words, by changing the rotation speeds of the first fan blade 100 and the second fan blade 200 and creating a rotation speed difference between the first fan blade 100 and the second fan blade 200, the present application can achieve large-range air output and small-range air output of the fan 1000, thereby enriching the air output modes of the fan 1000 and ensuring the air output effects in different air output modes to improve the user experience.

[0076] In a specific example, in the natural wind mode, especially when the rotation speed of the first fan blade 100 is less than that of the second fan blade 200, due to the low rotation speed of the first fan blade 100 and the high rotation speed of the second fan blade 200, at this time, after the air flow is initially accelerated by the second fan blade 200, most of the air flow directly flows out from the outer periphery of the first fan blade 100 to achieve large-area air output of the fan 1000, and a small part of the air flow will flow through the second fan blade 200 for secondary acceleration to facilitate air flow replenishment in the radial middle area of the fan 1000 and achieve the air supply effect of simulating natural wind.

[0077] In the wind concentrating mode, due to the high rotation speed of the first fan blade 100 and the low rotation speed of the second fan blade 200, at this time, after the air flow is initially accelerated by the second fan blade 200, most of the air flow will enter the first fan blade 100 again for secondary acceleration to increase the flow speed of the air flow and reduce the air output area, achieving wind concentrating air output.

[0078] It can be understood that, compared with the prior art, by adjusting the rotation speeds of the first fan blade 100 and the second fan blade 200 and creating a rotation speed difference between the first fan blade 100 and the second fan blade 200, the present application can achieve natural wind air output and wind concentrating air output of the fan 1000, ensure the air output effect, and improve the user experience.

[0079] It should also be emphasized that since the structure of the fan 1000 does not change in the natural wind mode and the wind concentrating mode, only the rotation speeds of the first fan blade 100 and the second fan blade 200 change. Therefore, when switching the mode of the fan 1000, the mode of the fan 1000 can be directly adjusted by adjusting the rotation speeds of the first fan blade 100 and the second fan blade 200, thereby reducing the difficulty of mode switching of the fan 1000, improving the response speed of the fan 1000, and ensuring the user experience.

[0080] In some embodiments, the fan 1000 further includes a driving member, which is used to drive the first fan blade 100 and the second fan blade 200 to rotate and can adjust the rotation speeds of the first fan blade 100 and the second fan blade 200 by using the driving member, thereby ensuring the working performance of the first fan blade 100 and the second fan blade 200 and reducing the control difficulty of the first fan blade 100 and the second fan blade 200, and thus reducing the difficulty of mode switching of the fan 1000.

[0081] Optionally, as Figure 1As shown, the driving member includes a first motor 400 and a second motor 500. The first motor 400 is connected to the first fan blade 100, and the second motor 500 is connected to the second fan blade 200. The first motor 400 is used to drive the first fan blade 100 to rotate and adjust the rotation speed of the first fan blade 100, and the second motor 500 is used to drive the second fan blade 200 to rotate and adjust the rotation speed of the second fan blade 200, so as to achieve the purpose of driving the first fan blade 100 and the second fan blade 200 to rotate, and reducing the control difficulty of the first fan blade 100 and the second fan blade 200.

[0082] Optionally, both the first motor 400 and the second motor 500 are rotating motors to ensure that the first motor 400 can effectively drive the first fan blade 100 to rotate and the second motor 500 can effectively drive the second fan blade 200 to rotate.

[0083] Of course, in some other embodiments, the first motor 400 and the second motor 500 are not limited to rotating motors. The first motor 400 and the second motor 500 can also be formed as linear motors. At this time, the first motor 400 and the second motor 500 are respectively connected to the first fan blade 100 and the second fan blade 200 through transmission components, and the purpose of driving the first fan blade 100 to rotate by the first motor 400 and driving the second fan blade 200 to rotate by the second motor 500 can also be achieved.

[0084] In some embodiments, as Figure 1 shown, the fan 1000 further includes a wind guide cylinder 600. The wind guide cylinder 600 has a first mounting portion 610 and a second mounting portion. The first mounting portion 610 is used to mount the first motor 400, and the second mounting portion is used to mount the second motor 500. To improve the position stability of the first motor 400 and the second motor 500, thereby ensuring the working performance of the first motor 400 and the second motor 500.

[0085] At the same time, by setting the wind guide cylinder 60, the installation difficulty of the first motor 400 and the second motor 500 can also be reduced, making the installation of the first motor 400 and the second motor 500 convenient.

[0086] Optionally, the wind guide cylinder 600 has an outer cylinder and an inner cylinder. The inner cylinder is connected to the outer cylinder by several radial rods. The first mounting portion 610 and the second mounting portion are provided on the inner cylinder, and a wind guide channel is formed between the inner cylinder and the outer cylinder. In this way, while realizing the support of the first motor 400 and the second motor 500 by the wind guide cylinder 600, the first motor 400, the second motor 500 and the wind guide cylinder 600 can also be prevented from obstructing the air flow, thereby ensuring the air outlet effect of the fan 1000.

[0087] Optionally, the diameter of the outer cylinder is greater than the diameter of the second fan blade 200, and the diameter of the inner cylinder is less than the diameter of the first fan blade 100, so as to ensure that in the axial direction of the fan 1000, the first fan blade 100 and the second fan blade 200 can be directly opposite to the air guiding channel of the air guiding cylinder 600, further avoiding the air guiding cylinder 600 from obstructing the air flow, thereby ensuring the air outlet effect of the fan 1000.

[0088] Meanwhile, the air guiding channel can also be used to restrict the air flow, preventing the air flow from diverging between the first fan blade 100 and the second fan blade 200, so as to facilitate the cooperation of the first fan blade 100 and the second fan blade 200 to guide the air, thereby ensuring the air outlet effect of the fan 1000.

[0089] In some embodiments, in the natural wind mode, the value range of the ratio of the maximum rotation speed of the second fan blade 200 to the maximum rotation speed of the first fan blade 100 is 1 - 1.8. In this way, in the natural wind mode, the maximum rotation speed of the second fan blade 200 is greater than the maximum rotation speed of the first fan blade 100, that is, the maximum rotation speed of the first fan blade 100 is less than the maximum rotation speed of the second fan blade 200. When the air flow guided by the second fan blade 200 flows towards the first fan blade 100, it can effectively ensure that a part of the air flow can directly flow out from the outer periphery of the first fan blade 100 (as Figure 3 shown), realizing the large-area air outlet of the fan 1000, and the air outlet wind speed is small, thereby realizing the delivery of natural wind.

[0090] It should be noted that the above describes the ratio relationship between the maximum rotation speeds of the second fan blade 200 and the first fan blade 100 in the natural wind mode. It can also be understood that in the natural wind mode, the first fan blade 100 and the second fan blade 200 also have other rotation speeds.

[0091] In a specific example, when the fan 1000 is operating in the natural wind mode, the fan 1000 has six gears, among which:

[0092] In the first natural wind gear, the rotation speed corresponding to the first fan blade 100 is 230 r / min, and the rotation speed corresponding to the second fan blade 200 is 400 r / min;

[0093] In the second natural wind gear, the rotation speed corresponding to the first fan blade 100 is 350 r / min, and the rotation speed corresponding to the second fan blade 200 is 500 r / min;

[0094] In the third natural wind gear, the rotation speed corresponding to the first fan blade 100 is 450 r / min, and the rotation speed corresponding to the second fan blade 200 is 600 r / min;

[0095] In the fourth natural wind gear, the rotation speed corresponding to the first fan blade 100 is 550 r / min, and the rotation speed corresponding to the second fan blade 200 is 700 r / min;

[0096] In the fifth natural wind gear position, the rotational speed corresponding to the first fan blade 100 is 650 r / min, and the rotational speed corresponding to the second fan blade 200 is 750 r / min;

[0097] In the sixth natural wind gear position, the rotational speed corresponding to the first fan blade 100 is 750 r / min, and the rotational speed corresponding to the second fan blade 200 is 800 r / min, so that at the same gear position, the rotational speed of the first fan blade 100 is less than that of the second fan blade 200, thereby ensuring the air outlet effect of the fan 1000 in the natural wind mode.

[0098] Optionally, in the natural wind mode, the ratio of the maximum rotational speed of the second fan blade 200 to the maximum rotational speed of the first fan blade 100 is controlled to be 1.06.

[0099] In the description of the present invention, the features defined as "first", "second", "third", "fourth", "fifth", and "sixth" may explicitly or implicitly include one or more of such features, which are used to distinguish and describe the features, without order or importance.

[0100] In some embodiments, in the air gathering mode, the value range of the ratio of the maximum rotational speed of the second fan blade 200 to the maximum rotational speed of the first fan blade 100 is 0.5 - 0.6. This can make the maximum rotational speed of the second fan blade 200 less than that of the first fan blade 100 in the air gathering mode, that is, make the maximum rotational speed of the first fan blade 100 greater than that of the second fan blade 200. In this way, when the air flow derived from the second fan blade 200 flows towards the first fan blade 100, most of the air flow will directly flow to the first fan blade 100 (as Figure 4 shown). At this time, the first fan blade 100 with a higher rotational speed can be used to increase the air flow speed flowing through it, thereby improving the air flow speed, and because the diameter of the tip of the first fan blade 100 is smaller, the air outlet area of the air flow flowing through the first fan blade 100 can also be reduced, thereby realizing air gathering and air outlet, and ensuring the air outlet effect of the fan 1000 in the air gathering mode.

[0101] It should be noted that the above describes the ratio relationship between the maximum rotational speeds of the second fan blade 200 and the first fan blade 100 in the air gathering mode. It can also be understood that in the air gathering mode, the first fan blade 100 and the second fan blade 200 also have other rotational speeds.

[0102] In a specific example, when the fan 1000 is operating in the air gathering mode, the fan 1000 has six gears, among which:

[0103] In the first air gathering gear position, the rotational speed corresponding to the first fan blade 100 is 1250 r / min, and the rotational speed corresponding to the second fan blade 200 is 700 r / min;

[0104] In the second air - gathering gear position, the corresponding rotational speed of the first fan blade 100 is 1350 r / min, and the corresponding rotational speed of the second fan blade 200 is 800 r / min;

[0105] In the third air - gathering gear position, the corresponding rotational speed of the first fan blade 100 is 1400 r / min, and the corresponding rotational speed of the second fan blade 200 is 800 r / min;

[0106] In the fourth air - gathering gear position, the corresponding rotational speed of the first fan blade 100 is 1450 r / min, and the corresponding rotational speed of the second fan blade 200 is 800 r / min;

[0107] In the fifth air - gathering gear position, the corresponding rotational speed of the first fan blade 100 is 1500 r / min, and the corresponding rotational speed of the second fan blade 200 is 800 r / min;

[0108] In the sixth air - gathering gear position, the corresponding rotational speed of the first fan blade 100 is 1550 r / min, and the corresponding rotational speed of the second fan blade 200 is 800 r / min, so that at the same gear position, the rotational speed of the first fan blade 100 is greater than that of the second fan blade 200, thereby ensuring the air - outlet effect of the fan 1000 in the air - gathering mode.

[0109] In some embodiments, in the air - gathering mode, the ratio of the maximum rotational speed of the second fan blade 200 to the maximum rotational speed of the first fan blade 100 is controlled to be 0.516.

[0110] Meanwhile, through the above - mentioned structure, it can also be known that when the air - gathering mode is running, at six gear positions, the rotational speed corresponding to the second fan blade 200 is within 700 r / min - 800 r / min. Among them, when the rotational speed of the second fan blade 200 is less than 700 r / min during the operation of the air - gathering mode, the air - guiding air volume of the second fan blade 200 is too small; when the rotational speed of the second fan blade 200 is greater than 800 r / min, it will cause a relatively large noise of the second fan blade 200 and a poor air - gathering effect, thus affecting the air - outlet effect of the fan 1000 in the air - gathering mode.

[0111] Therefore, when the air - gathering mode is running, at six gear positions, the rotational speed corresponding to the second fan blade 200 is set between 700 r / min and 800 r / min. In this way, while ensuring the air - guiding air volume of the second fan blade 200, the working noise of the second fan blade 200 can be reduced, and the air - gathering effect of the second fan blade 200 can be improved, thereby ensuring the air - outlet effect of the fan 1000 in the air - gathering mode and enhancing the user experience.

[0112] In some embodiments, when the air - gathering mode is running, the rotational speed corresponding to the second fan blade 200 can be 700 r / min, 750 r / min, 800 r / min, etc.

[0113] In some embodiments, the minimum rotational speed of the first fan blade 100 in the air-gathering mode is greater than the maximum rotational speed in the natural wind mode. That is to say, in the air-gathering mode, the first fan blade 100 has multiple air-gathering rotational speeds, and in the natural wind mode, the first fan blade 100 has multiple natural wind rotational speeds. The lowest air-gathering rotational speed is greater than the highest natural wind rotational speed. Thus, in the air-gathering mode, the rotational speed of the first fan blade 100 is relatively high to effectively ensure that the rotational speed of the first fan blade 100 is greater than that of the second fan blade 200. In this way, when the fan 1000 operates in the air-gathering mode, it can be ensured that when the airflow discharged by the second fan blade 200 flows towards the first fan blade 100, it can directly flow to the first fan blade 100, and the relatively high rotational speed of the first fan blade 100 can be used to increase the airflow speed flowing through it, thereby improving the airflow speed and ensuring the air outlet effect of the fan 1000 in the air-gathering mode.

[0114] In a specific example, in the air-gathering mode, the minimum rotational speed of the first fan blade 100 is 1250 r / min, and in the natural wind mode, the maximum rotational speed of the first fan blade 100 is 750 r / min. Thus, the minimum rotational speed of the first fan blade 100 in the air-gathering mode can be greater than the maximum rotational speed of the first fan blade 100 in the natural wind mode to ensure the air-gathering effect of the first fan blade 100 in the air-gathering mode.

[0115] In some embodiments, the value range of the ratio of the minimum rotational speed of the first fan blade 100 in the air-gathering mode to the maximum rotational speed in the natural wind mode is 1.5 - 6. To further ensure that the lowest air-gathering rotational speed of the first fan blade 100 can be greater than the highest natural wind rotational speed of the first fan blade 100, so that in the air-gathering mode, the rotational speed of the first fan blade 100 is relatively high, to effectively ensure that when the airflow discharged by the second fan blade 200 flows towards the first fan blade 100, it can directly flow to the first fan blade 100, and the relatively high rotational speed of the first fan blade 100 can be used to increase the airflow speed flowing through it, thereby improving the airflow speed and ensuring the air outlet effect of the fan 1000 in the air-gathering mode.

[0116] In some embodiments, the ratio of the minimum rotational speed of the first fan blade 100 in the air-gathering mode to the maximum rotational speed of the first fan blade 100 in the natural wind mode is 1.7.

[0117] In some embodiments, in the natural wind mode, the rotational speed of the first fan blade 100 is controlled to reciprocally switch between a first rotational speed and a second rotational speed, and the first rotational speed is greater than the second rotational speed. That is to say, when the fan 1000 operates in the natural wind mode, the rotational speed of the first fan blade 100 is controlled to reciprocally switch between a high rotational speed and a low rotational speed. In this way, the intermittent wind speed change and the change of the blowing area from large to small of the fan 1000 can be realized by using the first fan blade 100 to achieve the effect of simulating the blowing of natural wind, thereby ensuring the air outlet effect of the fan 1000 in the natural wind mode and improving the user experience.

[0118] In addition, by reciprocally switching the rotational speed of the first fan blade 100 between the first rotational speed and the second rotational speed, the difference in the rotational speeds of the first fan blade 100 and the second fan blade 200 can also be changed. Among them, when the difference in the rotational speeds of the first fan blade 100 and the second fan blade 200 is large, the blowing area of the fan 1000 is large at this time, and the wind speed is small. When the difference in the rotational speeds of the first fan blade 100 and the second fan blade 200 is not large, the blowing area of the fan 1000 is small at this time, and the wind speed is large. In this way, the first fan blade 100 and the second fan blade 200 can achieve intermittent wind speed changes and sudden changes in the blowing area of the fan 1000, so as to achieve the effect of simulating natural wind blowing.

[0119] In some embodiments, when controlling the rotational speed of the first fan blade 100 to switch to the first rotational speed, the first fan blade 100 can be first controlled to operate at the first rotational speed for a first period of time (e.g., 5 s to 30 s), and then the first fan blade 100 can be controlled to switch to the second rotational speed and operate at the second rotational speed for a second period of time (e.g., 5 s to 30 s). Then, the first fan blade 100 can be controlled to switch to the first rotational speed and operate at the first rotational speed for the first period of time, and so on, thereby realizing the reciprocal switching of the rotational speed of the first fan blade 100 between the first rotational speed and the second rotational speed, so as to ensure the air outlet effect of the fan 1000 in the natural wind mode.

[0120] In some embodiments, the first rotational speed is the first target rotational speed of the first fan blade 100, and the second rotational speed is the starting rotational speed of the first fan blade 100. Among them, the first target rotational speed mentioned here can be understood as the rotational speed of the first fan blade 100 corresponding to the six gears of the fan 1000 when the fan 1000 operates in the natural wind mode, that is, the rotational speed of the first fan blade 100 when in the first natural wind gear - the sixth natural wind gear in the above text. The starting rotational speed of the first fan blade 100 is the starting speed of the first fan blade 100.

[0121] In a specific example, the starting speed of the first fan blade 100 is 200 r / min.

[0122] That is to say, in the natural wind mode, the rotational speed of the first fan blade 100 is reciprocally switched between the first target rotational speed and the starting speed of the first fan blade 100, so as to realize the reciprocal switching of the first fan blade 100 between the high rotational speed and the low rotational speed, so as to ensure the air outlet effect of the fan 1000 in the natural wind mode and improve the user experience.

[0123] In a specific example, when the natural wind mode is running and the first natural wind gear is turned on, the rotation speed of the first fan blade 100 can be controlled to reciprocally switch between 230 r / min and 200 r / min; when the natural wind mode is running and the second natural wind gear is turned on, the rotation speed of the first fan blade 100 can be controlled to reciprocally switch between 350 r / min and 200 r / min, and so on, to ensure the air outlet effect of the fan 1000 in the natural wind mode.

[0124] In some embodiments, as Figure 8 shown, in the natural wind mode, the second fan blade 200 is controlled to switch from the first starting rotation speed to the second target rotation speed at a first set rule within a first set time. The second target rotation speed includes a first minimum rotation speed and a first maximum rotation speed. Herein, the second target rotation speed mentioned can be understood as the rotation speed of the second fan blade 200 corresponding to the six gears of the fan 1000 when the fan 1000 is running in the natural wind mode, that is, the rotation speed of the second fan blade 200 corresponding to the first natural wind gear - the sixth natural wind gear in the above text. Since the fan 1000 has six gears when running in the natural wind mode and the rotation speeds of the second fan blade 200 corresponding to the six gears are different, therefore, the second target rotation speed includes a first minimum rotation speed and a first maximum rotation speed.

[0125] In a specific example, the first minimum rotation speed is 400 r / min; the first maximum rotation speed is 800 r / min.

[0126] At the same time, by controlling the second fan blade 200 to switch from the first starting rotation speed to the second target rotation speed at a first set rule within a first set time, the rotation speed of the second fan blade 200 can be slowly increased or decreased, avoiding the phenomenon that the air supply of the second fan blade 200 is suddenly large or small, thereby ensuring the air outlet effect of the fan 1000 in the natural wind mode.

[0127] It should be noted that the above-mentioned first starting rotation speed can be 0 r / min, or the rotation speed of the second fan blade 200 corresponding to the first natural wind gear - the sixth natural wind gear. For example: when the fan 1000 is switched from the power-on state to the natural wind sixth gear state, the first starting rotation speed is 0 r / min at this time, and the second target rotation speed is 800 r / min; when the fan 1000 is switched from the natural wind first gear state to the natural wind sixth gear state, the first starting rotation speed is 400 r / min at this time, and the second target rotation speed is 800 r / min; when the fan 1000 is switched from the natural wind sixth gear state to the natural wind first gear state, the first starting rotation speed is 800 r / min at this time, and the second target rotation speed is 400 r / min, and so on.

[0128] In some embodiments, the first set time is 4 s to 8 s. That is to say, in the natural wind mode, the rotation speed of the second fan blade 200 is controlled to switch from the first starting speed to the second target speed at the first set rule within 4 s to 8 s.

[0129] In some embodiments, the first set rule is that the rotation speed increases or decreases in the form of an arithmetic progression. That is to say, in the natural wind mode, the rotation speed of the second fan blade 200 is controlled to switch from the first starting speed to the second target speed in the form of an arithmetic progression within 4 s to 8 s.

[0130] It should be noted that the difference value of the arithmetic progression of the first set rule is not limited and can be calculated according to the first set time, the first starting speed, and the second target speed.

[0131] Among them, the difference value of the arithmetic progression of the first set rule = (the second target speed - the first starting speed) / 60 ÷ the first set time.

[0132] For example: in the natural wind mode, when the fan 1000 is switched from the startup state to the natural wind sixth gear state, at this time, the difference value of the arithmetic progression of the first set rule = (800 r / min - 0 r / min) / 60 ÷ (4 s to 8 s), that is, the difference value of the arithmetic progression of the first set rule = 1.67 r / s to 3.3 r / s.

[0133] That is, in the natural wind mode, when the fan 1000 needs to be switched from the startup state to the natural wind sixth gear state, the rotation speed of the second fan blade 200 is controlled to increase from 0 r / min to 800 r / min at a rotation speed of 1.67 r / s to 3.3 r / s within 4 s to 8 s, so as to make the rotation speed of the second fan blade 200 increase slowly, avoid the phenomenon of sudden increase in the air supply of the second fan blade 200, and thus ensure the air outlet effect of the fan 1000 in the natural wind mode.

[0134] In some embodiments, as Figure 9 shown, in the air gathering mode, the rotation speed of the second fan blade 200 is controlled to switch from the second starting speed to the third target speed at the second set rule within the second set time. The third target speed includes the second lowest speed and the second highest speed, and the second lowest speed is greater than the first lowest speed. Among them, the third target speed mentioned here can be understood as the rotation speed of the second fan blade 200 corresponding to the six gears of the fan 1000 when the fan 1000 is operating in the air gathering mode, that is, the rotation speed of the second fan blade 200 corresponding to the first air gathering gear - the sixth air gathering gear in the above text. Since the fan 1000 has six gears when operating in the air gathering mode and the rotation speeds of the second fan blade 200 corresponding to the six gears are different, therefore, the third target speed includes the second lowest speed and the second highest speed.

[0135] In a specific example, the second lowest rotational speed is 700 r / min; the second highest rotational speed is 800 r / min.

[0136] Meanwhile, by controlling the second fan blade 200 to switch from the second starting rotational speed to the third target rotational speed at a second set rule within a second set time, the rotational speed of the second fan blade 200 can be increased or decreased slowly, avoiding the phenomenon that the air supply of the second fan blade 200 is suddenly large or small, thereby ensuring the air outlet effect of the fan 1000 in the air gathering mode.

[0137] In addition, by setting the second lowest rotational speed to be greater than the first lowest rotational speed, the lowest rotational speed of the second fan blade 200 in the air gathering mode is greater than the lowest rotational speed of the second fan blade 200 in the natural wind mode, thereby ensuring the air guiding air volume of the second fan blade 200, improving the air outlet effect of the fan 1000 in the air gathering mode, and enhancing the user experience.

[0138] It should be noted that the above-mentioned second starting rotational speed can be 0 r / min, or the rotational speed corresponding to the second fan blade 200 in the first air gathering gear - the sixth air gathering gear. For example: when the fan 1000 is switched from the power-on state to the air gathering sixth gear state, the second starting rotational speed is 0 r / min at this time, and the third target rotational speed is 800 r / min; when the fan 1000 is switched from the air gathering first gear state to the air gathering sixth gear state, the second starting rotational speed is 700 r / min at this time, and the third target rotational speed is 800 r / min, and so on.

[0139] In some embodiments, the second set time is 3 s to 5 s. That is to say, in the air gathering mode, the rotational speed of the second fan blade 200 is controlled to switch from the second starting rotational speed to the third target rotational speed at a second set rule within 3 s to 5 s.

[0140] In some embodiments, the second set rule is that the rotational speed increases or decreases in the form of an arithmetic progression. That is to say, in the air gathering mode, the rotational speed of the second fan blade 200 is controlled to switch from the second starting rotational speed to the third target rotational speed in the form of an arithmetic progression within 3 s to 5 s.

[0141] It should be noted that the difference of the arithmetic progression of the second set rule is not limited, and can be calculated according to the second set time, the second starting rotational speed and the third target rotational speed.

[0142] Among them, the difference of the arithmetic progression of the second set rule = (the third target rotational speed - the second starting rotational speed) / 60 ÷ the second set time.

[0143] In some embodiments, the third target rotational speed is 700 r / min to 800 r / min. This means that in the air-gathering mode, the target rotational speed of the second fan blade 200 is between 700 r / min and 800 r / min. In this way, while ensuring the air guiding volume of the second fan blade 200, the working noise of the second fan blade 200 can be reduced, and the air-gathering effect of the second fan blade 200 can be improved, thereby ensuring the air outlet effect of the fan 1000 in the air-gathering mode and enhancing the user experience.

[0144] In some embodiments, as Figure 8 shown, in the natural wind mode, first control the second fan blade 200 to switch to the second target rotational speed and maintain rotation at the current rotational speed, then control the first fan blade 100 to first switch to the first rotational speed, and then control the first fan blade 100 to switch between the first rotational speed and the second rotational speed, where the first rotational speed is greater than the second rotational speed. That is to say, in the natural wind mode, when controlling the second fan blade 200 to switch from the first starting rotational speed to the second target rotational speed within the first set time according to the first set rule, control the second fan blade 200 to maintain rotation at the current second target rotational speed, and then control the first fan blade 100 to first switch to the first rotational speed, and then control the first fan blade 100 to switch between the first rotational speed and the second rotational speed, so as to realize controlling the first fan blade 100 to reciprocally switch between high rotational speed and low rotational speed, achieving intermittent wind speed change and sudden change of the blowing area of the fan 1000 by using the first fan blade 100, thereby ensuring the air outlet effect of the fan 1000 in the natural wind mode and enhancing the user experience.

[0145] Optionally, as Figure 8 shown, when it is necessary to control the first fan blade 100 to switch to the first rotational speed, control the first fan blade 100 to switch from the third starting rotational speed to the first rotational speed within the third set time according to the third set rule, so that the rotational speed of the first fan blade 100 can increase or decrease slowly, avoiding sudden changes in the air supply of the first fan blade 100, thereby ensuring the air outlet effect of the fan 1000 in the natural wind mode.

[0146] It should be noted that when controlling the first fan blade 100 to switch from the second rotational speed to the first rotational speed, the third starting rotational speed is the second rotational speed.

[0147] Optionally, the third set time is 4 s to 8 s, the third set rule is that the rotational speed increases or decreases in an arithmetic progression, and the difference of the arithmetic progression of the third set rule is not limited and can be calculated according to the third set time, the third starting rotational speed and the first rotational speed.

[0148] Among them, the difference of the arithmetic progression of the third set rule = (the first rotational speed - the third starting rotational speed) / 60 ÷ the third set time.

[0149] Optionally, as Figure 8As shown, when it is necessary to control the first fan blade 100 to switch from the first rotational speed to the second rotational speed, control the first fan blade 100 to switch from the first rotational speed to the second rotational speed at a fourth set rule within a fourth set time, so that the rotational speed of the first fan blade 100 can be slowly decreased, avoiding the phenomenon that the air supply of the first fan blade 100 suddenly becomes small, thereby ensuring the air outlet effect of the fan 1000 in the natural wind mode.

[0150] Optionally, the fourth set time is 4s to 8s, the fourth set rule is that the rotational speed decreases in the form of an arithmetic progression, and the difference of the arithmetic progression of the fourth set rule is not limited and can be calculated according to the fourth set time, the second rotational speed, and the first rotational speed.

[0151] Wherein, the difference of the arithmetic progression of the fourth set rule = (the second rotational speed - the first rotational speed) / 60 ÷ the fourth set time.

[0152] It should be noted that the first rotational speed is the first target rotational speed of the first fan blade 100, the second rotational speed is the starting rotational speed of the first fan blade 100. The first target rotational speed can be understood as the rotational speed of the first fan blade 100 corresponding to the six gears of the fan 1000 when the fan 1000 is operating in the natural wind mode, that is, the rotational speed of the first fan blade 100 corresponding to the first natural wind gear - the sixth natural wind gear in the above text. The starting rotational speed of the first fan blade 100 is the starting speed of the first fan blade 100.

[0153] In summary, as Figure 8 shown, when operating the natural wind mode of the fan 1000, first determine the second target rotational speed of the second fan blade 200, then control the second fan blade 200 to switch from the first starting rotational speed to the second target rotational speed at a first set rule within a first set time and maintain the current rotational speed to rotate, then control the first fan blade 100 to switch from the third starting rotational speed to the first rotational speed at a third set rule within a third set time and operate at the first rotational speed for a first time, then control the first fan blade 100 to switch from the first rotational speed to the second rotational speed at a fourth set rule within a fourth set time and operate at the second rotational speed for a second time, then control the first fan blade 100 to switch from the second rotational speed to the first rotational speed at a third set rule within a third set time and operate at the first rotational speed for a first time, and so on until the user switches the mode, gear, or stops the machine.

[0154] In some embodiments, as Figure 9As shown, in the air-concentrating mode, first control the first fan blade 100 to switch to the fourth target speed and maintain rotation at the current speed, and then control the second fan blade 200 to switch to the third target speed and maintain rotation at the current speed. That is to say, when operating the air-concentrating mode of the fan 1000, first control the first fan blade 100 to rotate, and then control the second fan blade 200 to rotate. Since the diameter of the tip of the first fan blade 100 is small and the speed is high, at this time, it can be ensured that when the air flow discharged from the second fan blade 200 flows towards the first fan blade 100, most of the air flow can directly flow to the first fan blade 100, so as to increase the air flow speed flowing through the first fan blade 100 and reduce the air outlet area of the air flow flowing through the first fan blade 100, thereby achieving the air-concentrating effect and ensuring the air outlet effect of the fan 1000 in the air-concentrating mode.

[0155] Among them, the fourth target speed mentioned here can be understood as the speed of the first fan blade 100 corresponding to the six gears of the fan 1000 when the fan 1000 operates in the air-concentrating mode, that is, the speed of the first fan blade 100 in the first air-concentrating gear - the sixth air-concentrating gear in the above text. Since the fan 1000 has six gears when operating in the air-concentrating mode and the speeds of the first fan blade 100 corresponding to the six gears are different, therefore, the fourth target speed includes the third lowest speed and the third highest speed.

[0156] In a specific example, the third lowest speed is 1250 r / min; the first highest speed is 1550 r / min.

[0157] Optionally, as Figure 9 shown, when it is necessary to control the first fan blade 100 to switch to the fourth target speed, control the first fan blade 100 to switch from the fourth starting speed to the fourth target speed at a fifth set rule within a fifth set time, so that the speed of the first fan blade 100 can be increased or decreased slowly, avoiding the phenomenon that the air supply of the first fan blade 100 is suddenly large or small, thereby ensuring the air outlet effect of the fan 1000 in the air-concentrating mode.

[0158] Optionally, the fifth set time is 3 s to 5 s, the fifth set rule is that the speed increases or decreases in the form of an arithmetic progression, and the difference of the arithmetic progression of the fifth set rule is not limited and can be calculated according to the fifth set time, the fourth starting speed and the fourth target speed.

[0159] Among them, the difference of the arithmetic progression of the fifth set rule = (the fourth target speed - the fourth starting speed) / 60 / the fifth set time.

[0160] Optionally, as Figure 9As shown, when controlling the second fan blade 200 to switch to the third target speed, control the second fan blade 200 to switch from the second starting speed to the third target speed within the second set time according to the second set rule. The third target speed, the second set time, the second set rule, and the second starting speed can be referred to above and will not be elaborated here.

[0161] In summary, as Figure 9 shown, when operating the air-gathering mode of the fan 1000, first determine the fourth target speed of the first fan blade 100, and then control the first fan blade 100 to switch from the fourth starting speed to the fourth target speed within the fifth set time according to the fifth set rule and maintain the current speed of rotation. Then control the second fan blade 200 to switch from the second starting speed to the third target speed within the second set time according to the second set rule and maintain the current speed of rotation until the user switches the mode, gear, or shuts down the machine.

[0162] In some embodiments, the fan 1000 satisfies: 0.4 ≤ D1 / D2 ≤ 0.9. The ratio of the diameter of the tip of the first fan blade 100 to the diameter of the tip of the second fan blade 200 is between 0.4 and 0.9.

[0163] Among them, when the ratio of the diameter of the tip of the first fan blade 100 to the diameter of the tip of the second fan blade 200 is less than 0.4, on the premise that the diameter of the tip of the second fan blade 200 is certain, it will cause the diameter of the tip of the first fan blade 100 to be smaller, that is, it will cause the size of the first fan blade 100 to be smaller. At this time, when operating the air-gathering mode, it will cause the airflow to be gathered by the first fan blade 100 in an overly small area, resulting in an overly small air outlet area, affecting the user experience. And when operating the natural wind mode, it will also cause the effect of the first fan blade 100 supplementing the airflow to be poor, resulting in a poor air dispersion effect. At the same time, there will also be a problem that the inner cylinder of the air guide cylinder 600 blocks the first fan blade 100 in the airflow direction, thereby affecting the air outlet effect of the fan 1000; when the ratio of the diameter of the tip of the first fan blade 100 to the diameter of the tip of the second fan blade 200 is greater than 0.9, on the premise that the diameter of the tip of the second fan blade 200 is certain, it will cause the diameter of the tip of the second fan blade 200 to be larger. At this time, when operating the air-gathering mode, it will cause the airflow to be gathered by the first fan blade 100 in an overly large area, resulting in an overly large air outlet area and a poor air-gathering effect, affecting the user experience. And when operating the natural wind mode, it will also cause the area of the first fan blade 100 supplementing the airflow to be large, while the area of the second fan blade 200 diverging the air outlet is overly small, resulting in a poor air dispersion effect, thereby affecting the air outlet effect of the fan 1000.

[0164] Therefore, in the present application, the ratio of the diameter of the tip of the first fan blade 100 to the diameter of the tip of the second fan blade 200 is set between 0.4 and 0.9. In this way, while ensuring that the first fan blade 100 can guarantee the air-gathering area in the air-gathering mode, it can also ensure that in the natural wind mode, the first fan blade 100 can effectively supplement the air flow and ensure that the second fan blade 200 can emit air divergently, thereby ensuring the air outlet effect of the fan 1000 in both the air-gathering mode and the natural wind mode and improving the user experience.

[0165] In a specific example, the ratio of the diameter of the tip of the first fan blade 100 to the diameter of the tip of the second fan blade 200 can be 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc.

[0166] In some embodiments, as shown in Figure 1 and Figure 2 the installation directions of the first fan blade 100 and the second fan blade 200 are opposite, and in the air-gathering mode and the natural wind mode, the rotation directions of the first fan blade 100 and the second fan blade 200 are controlled to be opposite. Here, the opposite installation directions can be understood as that the inclination directions of the blades of the first fan blade 100 and the second fan blade 200 are different, and the opposite rotation directions can be understood as that the rotation directions of the first fan blade 100 and the second fan blade 200 are different.

[0167] In a specific example, when the blade of the first fan blade 100 extends obliquely to the left, the blade of the second fan blade 200 extends obliquely to the right; or when the blade of the first fan blade 100 extends obliquely to the right, the blade of the second fan blade 200 extends obliquely to the left, so that the inclination directions of the blades of the first fan blade 100 and the second fan blade 200 are different; correspondingly, when the first fan blade 100 rotates clockwise, the second fan blade 200 rotates counterclockwise; or when the first fan blade 100 rotates counterclockwise, the second fan blade 200 rotates clockwise, so that the rotation directions of the first fan blade 100 and the second fan blade 200 are different.

[0168] Through the above settings, the cooperation of the first fan blade 100 and the second fan blade 200 can be effectively used to change the air outlet direction of the fan 1000 to ensure the air outlet effect of the fan 1000, especially significant when operating in the air-gathering mode.

[0169] Among them, when the second fan blade 200 rotates counterclockwise in the air-gathering mode, the air flow generated by the second fan blade 200 will diverge outward along the rotation axis of the fan 1000. At this time, when the first fan blade 100 rotates clockwise, because the rotation speed of the first fan blade 100 is greater than that of the second fan blade 200 in the air-gathering mode, the second fan blade 200 can effectively control the air flow flowing to it to converge inward along the rotation axis of the fan 1000 to improve the air flow guiding effect, thereby realizing the air-gathering air outlet effect and making the air outlet effect in the air-gathering mode better.

[0170] The following describes another control method for the fan 1000 according to an embodiment of the present invention with reference to the accompanying drawings of the specification.

[0171] Among them, in combination with Figure 1 and Figure 2 As shown, the fan 1000 includes a first fan blade 100 and a second fan blade 200. The diameter of the tip of the first fan blade 100 is D1, and the diameter of the tip of the second fan blade 200 is D2, where D1 < D2. The first fan blade 100 is located on the air outlet side of the second fan blade 200. The control method includes:

[0172] Control the second fan blade 200 to switch to a second target speed and maintain rotation at the current speed.

[0173] Control the first fan blade 100 to first switch to a first speed, and then control the first fan blade 100 to switch between the first speed and a second speed, where the first speed is greater than the second speed and less than or equal to the second target speed.

[0174] That is to say, another control method of the fan 1000 is to first control the second fan blade 200 to switch to the second target speed and maintain rotation at the current speed. Since the diameter of the tip of the second fan blade 200 is larger than that of the first fan blade 100, and the second target speed of the second fan blade 200 is greater than the first speed of the first fan blade 100, at this time, the second fan blade 200 can be used to initially accelerate the air to ensure the air flow speed. Subsequently, control the first fan blade 100 to switch to the first speed. Since the diameter of the tip of the first fan blade 100 is smaller and the first speed of the first fan blade 100 is less than or equal to the second target speed, at this time, after the air flow is initially accelerated by the second fan blade 200, most of the air flow directly flows out from the outer periphery of the first fan blade 100 to achieve large-area air outlet of the fan 1000. A small part of the air flow will flow through the second fan blade 200 for secondary acceleration to facilitate air flow supplement in the radial middle area of the fan 1000, achieve the air supply effect of simulating natural wind, and ensure the natural wind outlet effect.

[0175] In addition, by controlling the first fan blade 100 to switch between the first speed and the second speed, since the first speed is greater than the second speed, it is possible to control the first fan blade 100 to reciprocally switch between a high speed and a low speed. In this way, the first fan blade 100 can be used to achieve intermittent wind speed changes and changes in the blowing area of the fan 1000 that are sometimes large and sometimes small, so as to achieve the effect of simulating natural wind blowing, thereby ensuring the air outlet effect of the fan 1000 in the natural wind mode and improving the user experience.

[0176] In summary, based on the difference in the diameters of the first fan blade 100 and the second fan blade 200, by controlling the sequence of starting the first fan blade 100 and the second fan blade 200, and controlling the rotational speed of the first fan blade 100 to be less than or equal to the rotational speed of the second fan blade 200, while ensuring that the fan 1000 can deliver natural wind, the natural wind delivery effect can also be guaranteed, thereby improving the working performance of the fan 1000 and ensuring the user experience.

[0177] Next, refer to the accompanying drawings of the specification to describe another control method of the fan 1000 according to an embodiment of the present invention.

[0178] Among them, in combination with Figure 1 and Figure 2 As shown, the fan 1000 includes a first fan blade 100 and a second fan blade 200. The diameter of the tip of the first fan blade 100 is D1, and the diameter of the tip of the second fan blade 200 is D2, where D1 < D2. The first fan blade 100 is located on the air outlet side of the second fan blade 200. The control method includes:

[0179] Control the first fan blade 100 to switch to the fourth target rotational speed and maintain rotation at the current rotational speed, and then control the second fan blade 200 to switch to the third target rotational speed and maintain rotation at the current rotational speed. The fourth target rotational speed is greater than the third target rotational speed.

[0180] That is to say, another control method of the fan 1000 is to first control the first fan blade 100 to switch to the fourth target rotational speed and maintain rotation at the current rotational speed. Since the diameter of the tip of the first fan blade 100 is smaller than the diameter of the tip of the second fan blade 200, and the fourth target rotational speed of the first fan blade 100 is greater than the third rotational speed of the second fan blade 200, at this time, the first fan blade 100 can be used to initially accelerate the air to ensure the air flow speed. Subsequently, control the second fan blade 200 to switch to the third target rotational speed and maintain rotation at the current rotational speed. After the air flow is accelerated by the second fan blade 200, most of the air flow will enter the first fan blade 100 again for secondary acceleration, so as to increase the air flow speed and reduce the air outlet area, realizing concentrated air outlet.

[0181] In summary, based on the difference in the diameters of the first fan blade 100 and the second fan blade 200, by controlling the sequence of starting the first fan blade 100 and the second fan blade 200, and controlling the rotational speed of the first fan blade 100 to be greater than the rotational speed of the second fan blade 200, while ensuring that the fan 1000 can deliver concentrated air, the concentrated air delivery effect can also be guaranteed, thereby improving the working performance of the fan 1000 and ensuring the user experience.

[0182] Next, refer to the accompanying drawings of the specification to describe the fan 1000 according to an embodiment of the present invention.

[0183] A fan 1000 according to an embodiment of the present invention includes: a controller (not shown in the figure), and the controller executes the foregoing control method, and the specific steps of the control method will not be elaborated here.

[0184] As can be seen from the above structure, for the fan 1000 according to the embodiment of the present invention, by setting a controller to execute the foregoing control method, the fan 1000 can respectively deliver natural wind and concentrated wind, and at the same time, the air supply effect of the fan 1000 when delivering natural wind and concentrated wind can be ensured, the working performance of the fan 1000 can be improved, and the user experience can be guaranteed.

[0185] In some embodiments, as Figure 1 shown, the fan 1000 further includes a front grille 300, and the front grille 300 is provided on the air outlet side of the first fan blade 100. Herein, the air outlet side mentioned here can be understood as the side of the first fan blade 100 away from the second fan blade 200, so as to protect the first fan blade 100 and the second fan blade 200 by using the front grille 300, extend the service life of the first fan blade 100 and the second fan blade 200, and ensure the use performance of the first fan blade 100 and the second fan blade 200.

[0186] In some embodiments, the front grille 300 is provided at the air outlet of the fan 1000. In this way, while realizing that the front grille 300 is provided on the air outlet side of the first fan blade 100, the internal structure of the fan 1000 can be shielded by the front grille 300, preventing the blades of the first fan blade 100 and the second fan blade 200 from breaking during the operation of the fan 1000 and flying out through the air outlet of the fan 1000 to cause harm to the user, and at the same time preventing the user from accidentally touching the blades of the first fan blade 100 and the second fan blade 200 and getting injured, thereby improving the safety of the fan 1000.

[0187] In addition, the front grille 300 can also be used to reduce the risk of dust and other sundries accumulating inside the fan 1000, so as to ensure the air guiding effect of the fan 1000.

[0188] Optionally, a mesh hole structure is formed on the front grille 300, and the air flow inside the fan 1000 can be discharged through the mesh hole structure to avoid the front grille 300 from hindering the air flow, thereby ensuring the working performance of the fan 1000.

[0189] Optionally, the front grille 300 is detachably connected to the air guiding cylinder 600, so as to support the front grille 300 by using the air guiding cylinder 600, improve the position stability of the front grille 300, and at the same time reduce the fixing difficulty of the front grille 300.

[0190] In some embodiments, as Figure 1As shown, the fan 1000 further includes a rear grille 700, and the rear grille 700 is disposed on the air inlet side of the second fan blade 200. Here, the so-called air inlet side can be understood as the side of the second fan blade 200 away from the first fan blade 100, so as to protect the second fan blade 200 and the first fan blade 100 by means of the rear grille 700, extend the service life of the first fan blade 100 and the second fan blade 200, and ensure the service performance of the first fan blade 100 and the second fan blade 200.

[0191] In some embodiments, the rear grille 700 is disposed at the air inlet of the fan 1000. In this way, while achieving the arrangement of the rear grille 700 on the air inlet side of the second fan blade 200, the internal structure of the fan 1000 can also be shielded by the rear grille 700 to prevent the blades of the first fan blade 100 and the second fan blade 200 from breaking during the operation of the fan 1000 and flying out through the air inlet of the fan 1000 to cause harm to users. At the same time, it can prevent users from accidentally touching the blades of the first fan blade 100 and the second fan blade 200 and getting injured, thereby improving the safety of the fan 1000.

[0192] In addition, the risk of accumulation of dust and other sundries inside the fan 1000 can be reduced by means of the rear grille 700 to ensure the air guiding effect of the fan 1000.

[0193] Optionally, the rear grille 700 is formed with a mesh structure, and external air can enter the fan 1000 through the mesh structure to avoid the rear grille 700 from obstructing the air inlet of the fan 1000, thereby ensuring the working performance of the fan 1000.

[0194] Optionally, the rear grille 700 is detachably connected to the air guiding cylinder 600, so as to support the rear grille 700 by means of the air guiding cylinder 600, improve the position stability of the rear grille 700, and at the same time reduce the fixing difficulty of the rear grille 700.

[0195] In some embodiments, in combination with Figure 5 and Figure 6As shown, the front grille 300 includes multiple circles of air outlet areas 310, and the multiple circles of air outlet areas 310 are arranged in sequence along the radial direction of the front grille 300; the multiple circles of air outlet areas 310 include an outer air outlet area 311 and an inner air outlet area 312, and the air guiding ribs of the outer air outlet area 311 are formed into straight ribs 3111; the air guiding ribs of the inner air outlet area 312 are formed into arc-shaped ribs 3121. That is to say, the front grille 300 includes an outer air outlet area 311 and an inner air outlet area 312, the outer air outlet area 311 and the inner air outlet area 312 are arranged in sequence along the radial direction of the front grille 300, the air guiding ribs of the outer air outlet area 311 are formed into straight ribs 3111, and the air guiding ribs of the inner air outlet area 312 are formed into arc-shaped ribs 3121. In this way, when the air flow passes through the outer air outlet area 311 and the inner air outlet area 312, the outer air outlet area 311 and the inner air outlet area 312 can be respectively used to guide the air flow to ensure the air outlet effect of the fan 1000.

[0196] Among them, when the fan 1000 operates in the natural wind mode, most of the air flow will flow to the outer air outlet area 311. At this time, the straight ribs 3111 on the outer air outlet area 311 are used to guide the air flow, so that the air flow can flow towards the radial outside of the fan 1000 to ensure the air outlet effect of the fan 1000 in the natural wind mode; when the fan 1000 operates in the concentrated wind mode, most of the air flow will flow to the inner air outlet area 312. At this time, the arc-shaped ribs 3121 on the inner air outlet area 312 are used to guide the air flow and reduce the resistance of the inner air outlet area 312 to the air flow to ensure the air outlet effect of the fan 1000 in the concentrated wind mode.

[0197] It should be noted that the above-mentioned outer air outlet area 311 can be understood as the area far from the rotation axis of the fan 1000, and the inner air outlet area 312 can be understood as the area close to the rotation axis of the fan 1000. By forming the air guiding ribs of the outer air outlet area 311 into straight ribs 3111, the outer air outlet area 311 can be used to guide the air flow towards the direction away from the rotation axis to achieve the air dispersion effect, thereby ensuring the air outlet effect of the fan 1000 in the natural wind mode. By forming the air guiding ribs of the inner air outlet area 312 into arc-shaped ribs 3121, the resistance of the inner air outlet area 312 to the air flow can be reduced, thereby ensuring the air outlet effect of the fan 1000 in the concentrated wind mode.

[0198] Specifically, in the concentrated wind mode, refer to Figure 10 and Figure 11 As shown, among them, in Figure 10 a and Figure 10 b, the simulation streamline diagrams of the air flow of the fan 1000 when operating in the concentrated wind mode are respectively shown. From Figure 10 a and Figure 10As can be seen from [b], in the air-gathering mode, the airflow generated by the fan 1000 of the present application is in a bundled shape and concentrated on the middle area corresponding to the first fan blade 100. In Figure 11 a and Figure 11 Figure [b] respectively show the simulated cross-sectional velocity distribution diagrams of the airflow when the fan 1000 is operating in the air-gathering mode. As can be seen from Figure 11 Figure [a] and Figure 11 Figure [b], the airflow velocity in the radial middle part of the fan 1000 is faster, and the airflow velocity in the area adjacent to the rotation axis is fast, with a small area, and the air-gathering effect is good.

[0199] In the natural wind mode, refer to Figure 12 and Figure 13 as shown. Among them, in Figure 12 Figure [a] and Figure 12 Figure [b] respectively show the simulated streamline diagrams of the airflow when the fan 1000 is operating in the natural wind mode. As can be seen from Figure 12 Figure [a] and Figure 12 Figure [b], in the natural wind mode, the airflow generated by the fan 1000 of the present application is in a divergent shape and covers most of the radial area of the fan 1000 corresponding to the first fan blade 100 and the second fan blade 200. The air supply area is large. In Figure 13 Figure [a] and Figure 13 Figure [b] respectively show the simulated cross-sectional velocity distribution diagrams of the airflow when the fan 1000 is operating in the natural wind mode. As can be seen from Figure 13 Figure [a] and Figure 13 Figure [b], in the natural wind mode, the overall airflow velocity of the fan 1000 is slower, the air outlet area is large, the gas flow velocity is small, and the air-dispersing effect is good.

[0200] In some embodiments, as shown in combination with Figure 5 and Figure 6 , both the outer air outlet area 311 and the inner air outlet area 312 are formed in a ring shape. The outer air outlet area 311 and the inner air outlet area 312 are coaxially arranged, and the outer air outlet area 311 is sleeved on the outer periphery of the inner air outlet area 312, so as to realize the setting of multiple air outlet areas 310 on the front grille 300 and ensure the aesthetics of the fan 1000.

[0201] Optionally, as shown in combination with Figure 5 and Figure 6 , a plurality of straight ribs 3111 are formed in the outer air outlet area 311. The plurality of straight ribs 3111 are evenly spaced in the circumferential direction and extend along the radial direction of the fan 1000. In this way, it can be ensured that the airflow flowing through the outer air outlet area 311 can flow along the radial direction of the fan 1000, so as to ensure the air outlet area of the fan 1000 in the radial direction, thereby ensuring the air-dispersing effect of the fan 1000.

[0202] Optionally, as shown in combination with Figure 5 and Figure 6As shown, a plurality of arc-shaped ribs 3121 are formed in the inner ring air outlet area 312. The plurality of arc-shaped ribs 3121 are evenly spaced apart in the circumferential direction, and the arc-shaped protrusions of the plurality of arc-shaped ribs 3121 are in the same direction. This can reduce the resistance of the inner ring air outlet area 312 to the air flow, thereby ensuring the air outlet effect.

[0203] Of course, in some other embodiments, the air guide ribs in the inner ring air outlet area 312 are not limited to forming arc-shaped ribs 3121, but can also be formed as straight-line ribs (such as Figure 1 This helps to ensure the wind gathering effect of the inner circle air outlet area 312.

[0204] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0205] Through the above settings, in a specific example, in the wind gathering mode, the rotation speed of the first fan blade 100 is greater than the rotation speed of the second fan blade 200, so that after the airflow is initially accelerated by the second fan blade 200, it will flow into the first fan blade 100, and the first fan blade 100 will be used to further accelerate the airflow, and the airflow will flow out after being rectified by the inner circle air outlet area 312 of the front mesh cover 300, which can effectively increase the airflow speed and reduce the air outlet area to improve the wind gathering effect; in the natural wind mode, the rotation speed of the first fan blade 100 is less than the rotation speed of the second fan blade 200, so that after the airflow is accelerated by the second fan blade 200, most of the airflow directly enters the front mesh cover 300, increasing the air outlet area and reducing the airflow speed to improve the natural wind outlet effect.

[0206] The control method of the fan 1000 of the present application is described in detail below with reference to the drawings in the specification, wherein the fan 1000 here may be a floor-standing fan 1000.

[0207] Among them, combined Figure 1 and Figure 2 As shown, the fan 1000 includes a first blade 100, a second blade 200 and a front mesh cover 300. The first blade 100 is located on the air outlet side of the second blade 200, and the front mesh cover 300 is arranged on the air outlet side of the first blade 100. The installation direction of the first blade 100 is opposite to that of the second blade 200. In the wind gathering mode and the natural wind mode, the directions of the first blade 100 and the second blade 200 are controlled to be opposite. The diameter of the tip of the first blade 100 is D1, and the diameter of the tip of the second blade 200 is D2, and D1<D2.

[0208] like Figure 5 and Figure 6As shown, the front grille 300 includes an outer air outlet area 311 and an inner air outlet area 312. The outer air outlet area 311 and the inner air outlet area 312 are arranged in sequence along the radial direction of the front grille 300. The air guiding ribs in the outer air outlet area 311 are formed into straight ribs 3111, and the air guiding ribs in the inner air outlet area 312 are formed into arc-shaped ribs 3121.

[0209] The control method of the fan 1000 includes the following steps:

[0210] S21. Receive the instruction to operate in the natural wind mode;

[0211] S22. Determine the second target speed of the second fan blade 200;

[0212] S23. Control the second fan blade 200 to switch from the first starting speed to the second target speed within the first set time according to the first set rule and maintain the current speed of rotation;

[0213] S24. Determine the first speed of the first fan blade 100;

[0214] S25. Control the first fan blade 100 to switch from the third starting speed to the first speed within the third set time according to the third set rule and operate at the first speed for the first time;

[0215] S26. Control the first fan blade 100 to switch from the first speed to the second speed within the fourth set time according to the fourth set rule and operate at the second speed for the second time, and execute S25.

[0216] S31. Receive the instruction to operate in the concentrated wind mode;

[0217] S32. Determine the fourth target speed of the first fan blade 100;

[0218] S33. Control the first fan blade 100 to switch from the fourth starting speed to the fourth target speed within the fifth set time according to the fifth set rule and maintain the current speed of rotation;

[0219] S34. Determine the third target speed of the second fan blade 200;

[0220] S35. Control the second fan blade 200 to switch from the second starting speed to the third target speed within the second set time according to the second set rule and maintain the current speed of rotation.

[0221] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0222] Other components of the fan 1000 and the control method of the fan 1000 according to the embodiments of the present invention are known to those of ordinary skill in the art and will not be described in detail herein.

[0223] In the description of this specification, the descriptions referring to the terms "embodiment", "example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations 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 one or more embodiments or examples in a suitable manner.

[0224] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A control method for a fan, characterized in that, the fan includes a first fan blade and a second fan blade, the diameter of the tip of the first fan blade is D1, the diameter of the tip of the second fan blade is D2, D1 < D2, the first fan blade is located on the air outlet side of the second fan blade, and the control method includes: Receiving an operation mode instruction; When it is determined that the operation mode is the natural wind mode, controlling the first fan blade and the second fan blade to blow air in the same direction, and the rotational speed of the first fan blade is less than or equal to the rotational speed of the second fan blade; When it is determined that the operation mode is the air gathering mode, controlling the first fan blade and the second fan blade to blow air in the same direction, and the rotational speed of the first fan blade is greater than the rotational speed of the second fan blade.

2. The control method for a fan according to claim 1, characterized in that, in the natural wind mode, the value range of the ratio of the maximum rotational speed of the second fan blade to the maximum rotational speed of the first fan blade is 1 - 1.8; and / or, in the air gathering mode, the value range of the ratio of the maximum rotational speed of the second fan blade to the maximum rotational speed of the first fan blade is 0.5 - 0.

6.

3. The control method for a fan according to claim 1, characterized in that, controlling the minimum rotational speed of the first fan blade in the air gathering mode to be greater than the maximum rotational speed in the natural wind mode.

4. The control method for a fan according to claim 3, characterized in that, the value range of the ratio of the minimum rotational speed of the first fan blade in the air gathering mode to the maximum rotational speed in the natural wind mode is 1.5 - 6.

5. The control method for a fan according to claim 1, characterized in that, in the natural wind mode, controlling the rotational speed of the first fan blade to reciprocally switch between a first rotational speed and a second rotational speed, and the first rotational speed is greater than the second rotational speed.

6. The control method for a fan according to claim 5, characterized in that, the first rotational speed is the first target rotational speed of the first fan blade, and the second rotational speed is the starting rotational speed of the first fan blade.

7. The control method for a fan according to claim 1, characterized in that, in the natural wind mode, controlling the second fan blade to switch from a first starting rotational speed to a second target rotational speed within a first set time according to a first set rule, and the second target rotational speed includes a first minimum rotational speed and a first maximum rotational speed.

8. The control method for a fan according to claim 7, characterized in that, in the air gathering mode, controlling the second fan blade to switch from a second starting rotational speed to a third target rotational speed within a second set time according to a second set rule, and the third target rotational speed includes a second minimum rotational speed and a second maximum rotational speed, and the second minimum rotational speed is greater than the first minimum rotational speed.

9. The control method for a fan according to claim 8, characterized in that, the third target rotational speed is 700 r / min - 800 r / min.

10. The control method for a fan according to claim 1, characterized in that, In the natural wind mode, first control the second fan blade to switch to the second target speed and maintain rotation at the current speed, and then control the first fan blade to first switch to the first speed, and then control the first fan blade to switch between the first speed and the second speed, where the first speed is greater than the second speed.

11. The control method of the fan according to claim 1, wherein, in the wind gathering mode, first control the first fan blade to switch to the fourth target speed and maintain rotation at the current speed, and then control the second fan blade to switch to the third target speed and maintain rotation at the current speed.

12. The control method of the fan according to claim 1, wherein, the fan satisfies: 0.4 ≤ D1 / D2 ≤ 0.

9.

13. The control method of the fan according to any one of claims 1-12, wherein, the installation directions of the first fan blade and the second fan blade are opposite, and in the wind gathering mode and the natural wind mode, control the rotation directions of the first fan blade and the second fan blade to be opposite.

14. A control method of a fan, wherein, the fan includes a first fan blade and a second fan blade, the diameter of the tip of the first fan blade is D1, the diameter of the tip of the second fan blade is D2, D1 < D2, the first fan blade is located on the air outlet side of the second fan blade, and the control method includes: controlling the second fan blade to switch to the second target speed and maintain rotation at the current speed; controlling the first fan blade to first switch to the first speed, and then controlling the first fan blade to switch between the first speed and the second speed, where the first speed is greater than the second speed and less than or equal to the second target speed.

15. A control method of a fan, wherein, the fan includes a first fan blade and a second fan blade, the diameter of the tip of the first fan blade is D1, the diameter of the tip of the second fan blade is D2, D1 < D2, the first fan blade is located on the air outlet side of the second fan blade, and the control method includes: controlling the first fan blade to switch to the fourth target speed and maintain rotation at the current speed, and then controlling the second fan blade to switch to the third target speed and maintain rotation at the current speed, where the fourth target speed is greater than the third target speed.

16. A fan, wherein, including a controller, and the controller executes the control method according to any one of claims 1-15.

17. The fan according to claim 16, wherein, further including a front grille, and the front grille is provided on the air outlet side of the first fan blade.

18. The fan according to claim 17, wherein, the front grille includes multiple circles of air outlet areas, and the multiple circles of air outlet areas are arranged in sequence along the radial direction of the front grille; the multiple circles of air outlet areas include an outer circle air outlet area and an inner circle air outlet area, and the guide ribs of the outer circle air outlet area are formed into straight ribs; the guide ribs of the inner circle air outlet area are formed into arc-shaped ribs.

Images