Fan and fan control method

Abstract

The invention discloses a fan and a control method of the fan, the fan comprises a first fan blade and a second fan blade, the first fan blade is provided with a first blade, the first fan blade and the second fan blade are coaxially arranged, the first fan blade is located in front of the second fan blade, the rotation direction of the first fan blade is opposite to that of the second fan blade, and the second fan blade is provided with a second blade. The diameter D1 of the first fan blade is larger than the diameter D2 of the second fan blade, and the blade rear edge of the first blade is adjacent to the blade front edge of the second blade in the axial direction. Therefore, the rotating directions of the first fan blade and the second fan blade are opposite, the diameter of the first fan blade is larger than that of the second fan blade, the first fan blade and the second fan blade can be controlled to rotate simultaneously or independently to achieve air volume adjustment, or the rotating speed difference exists between the first fan blade and the second fan blade to achieve an air gathering mode and an air dispersing mode. The fan can have the air outlet characteristics of a circulating fan and a floor fan, air outlet modes are enriched, different use requirements are met, and the use experience is improved.

Description

Technical Field

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

[0002] In the related art, floor fans and circulation fans are two common types of fans. However, the air outlet forms of floor fans and circulation fans are different. Floor fans can achieve dispersed air outlet (i.e., diffused air), while circulation fans can achieve relatively concentrated air outlet (i.e., concentrated air), which can provide different usage experiences.

[0003] However, with the increasing living standards of people, consumers' requirements for fans are also getting higher and higher. As a result, the single air outlet method of floor fans and circulation fans is difficult to meet the usage requirements. Summary of the Invention

[0004] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, an object of the present invention is to provide a fan that can achieve dispersed air outlet and concentrated air outlet, providing a better usage experience.

[0005] The fan according to an embodiment of the present application includes: a first fan blade and a second fan blade. The first fan blade has first blades. The first fan blade and the second fan blade are coaxially arranged. The first fan blade is located in front of the second fan blade. The rotation directions of the first fan blade and the second fan blade are opposite. The second fan blade has second blades. The diameter D1 of the first fan blade is greater than the diameter D2 of the second fan blade, and the trailing edge of the first blade is axially adjacent to the leading edge of the second blade.

[0006] For the fan according to an embodiment of the present application, by setting the rotation directions of the first fan blade and the second fan blade to be opposite and the diameter of the first fan blade to be greater than that of the second fan blade, the first fan blade and the second fan blade can be controlled to rotate simultaneously or independently to adjust the air volume, or a rotational speed difference can be created between the first fan blade and the second fan blade to achieve the concentrated air mode and the diffused air mode. This enables the fan of the present application to have the air outlet characteristics of a circulation fan and a floor fan, enriching the air outlet modes, meeting different usage requirements, and improving the usage experience.

[0007] The fan according to an embodiment of the present application includes: a first fan blade and a second fan blade. The first fan blade has first blades. The first fan blade and the second fan blade are coaxially arranged. The first fan blade is located in front of the second fan blade. The second fan blade has second blades. The diameter D1 of the first fan blade is greater than the diameter D2 of the second fan blade, and the trailing edge of the first blade is axially adjacent to the leading edge of the second blade.

[0008] According to some embodiments of the present application, the diameter D1 of the first fan blade and the diameter D2 of the second fan blade satisfy: 0.4 ≤ D2 / D1 ≤ 0.9.

[0009] In some embodiments, the extending direction from the leading edge to the trailing edge of the first blade is opposite to the extending direction from the leading edge to the trailing edge of the second blade.

[0010] According to some embodiments of the present application, the distance L1 between the leading edge of the first blade and the trailing edge of the second blade satisfies: 0 < L1 < 80 mm.

[0011] In some embodiments, the fan further includes: a power source for driving the first fan blade and the second fan blade to rotate.

[0012] Further, the power source includes: a first motor and a second motor. The first motor is power-connected to the first fan blade, and the second motor is power-connected to the second fan blade, and is adapted to control the rotation speeds of the first fan blade and the second fan blade respectively.

[0013] According to some embodiments of the present application, the fan further includes: a wind guide cylinder having a first mounting portion and a second mounting portion thereon. The first mounting portion is used for mounting the first motor, and the second mounting portion is used for mounting the second motor.

[0014] Further, the fan further includes: an air outlet grille cover disposed on the air outlet side of the first fan blade and having a first grille ring and a second grille ring arranged in the radial direction in sequence. The first grille ring is used for diverging the air flow away from the rotation axis, and the second grille ring is used for converging the air flow towards the rotation axis.

[0015] Further, the ratio of the outer diameter D3 of the first grille ring to the diameter D1 of the first fan blade satisfies: 1 ≤ D3 / D1 ≤ 1.1, and the ratio of the outer diameter D4 of the second grille ring to the diameter D2 of the second fan blade satisfies: 1 ≤ D4 / D2 ≤ 1.1.

[0016] Further, the angles formed by the multiple first diversion grilles in the first grille ring with the axis are 5° to 90°, and the angles formed by the multiple second diversion grilles in the second grille ring with the axis are 0° to 5°.

[0017] Further, the thickness of the windward side of the grille of the first diversion grille is W1, and the thickness of the air outlet side of the grille of the first diversion grille is W2, and they satisfy: 1.5 mm ≤ W1 ≤ 5 mm, 1.5 mm ≤ W2 ≤ 5 mm.

[0018] According to some embodiments of the present application, the width L2 of the first flow guiding grille satisfies: 4 mm ≤ L2 ≤ 15 mm.

[0019] A control method of a fan according to an embodiment of the second aspect of the present application includes:

[0020] Obtaining an air outlet mode of the fan, where the air outlet mode includes a diffused air mode and a concentrated air mode;

[0021] Adjusting the rotational speeds of the first fan blade and the second fan blade according to the air outlet mode so that there is a rotational speed difference between the first fan blade and the second fan blade.

[0022] Further, the adjusting the rotational speeds of the first fan blade and the second fan blade according to the air outlet mode specifically includes:

[0023] In the diffused air mode, the rotational speed of the first fan blade is lower than that of the second fan blade;

[0024] In the concentrated air mode, the rotational speed of the second fan blade is lower than that of the first fan blade.

[0025] Further, both the diffused air mode and the concentrated air mode have multiple gears, and the control method further includes:

[0026] In the diffused air mode, the rotational speed difference between the first fan blade and the second fan blade is 100 r / min to 250 r / min;

[0027] In the concentrated air mode, the rotational speed difference between the first fan blade and the second fan blade is 500 r / min to 800 r / min, and both are positively correlated with the gear.

[0028] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] 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, where:

[0030] Figure 1 is a three-dimensional schematic diagram of a fan according to a first embodiment of the present application;

[0031] Figure 2 is a front view schematic diagram of a fan according to a first embodiment of the present application;

[0032] Figure 3 is an exploded schematic diagram of a fan according to a first embodiment of the present application;

[0033] Figure 4Schematic diagram of the cooperation between the first fan blade and the second fan blade of the fan according to an embodiment of the present application;

[0034] Figure 5 Stereoscopic schematic diagram of the fan according to the second embodiment of the present application;

[0035] Figure 6 Front view schematic diagram of the fan according to the second embodiment of the present application;

[0036] Figure 7 Explosion schematic diagram of the fan according to the second embodiment of the present application;

[0037] Figure 8 Schematic diagram of an angle of the air outlet grille according to the second embodiment of the present application;

[0038] Figure 9 Schematic diagram of another angle of the air outlet grille according to the second embodiment of the present application;

[0039] Figure 10 Cross-sectional schematic diagram of the air outlet grille according to the second embodiment of the present application;

[0040] Figure 11 Cross-sectional schematic diagram of the fan according to the second embodiment of the present application;

[0041] Figure 12 Explosion schematic diagram of the fan according to the third embodiment of the present application;

[0042] Figure 13 Schematic diagram of the first blade according to the third embodiment of the present application;

[0043] Figure 14 Simulation airflow streamline diagram and simulation airflow cross-sectional velocity distribution diagram of the airflow of the fan in the air gathering mode according to an embodiment of the present application;

[0044] Figure 15 Simulation airflow streamline diagram and simulation airflow cross-sectional velocity distribution diagram of the airflow of the fan in the air scattering mode according to an embodiment of the present application;

[0045] Figure 16 Schematic diagram of the airflow path of the fan in the air gathering mode according to an embodiment of the present application;

[0046] Figure 17 Schematic diagram of the airflow path of the fan in the air scattering mode according to an embodiment of the present application;

[0047] Figure 18 Schematic diagram of the control method of the fan according to an embodiment of the present application.

[0048] Reference numerals:

[0049] Fan 100,

[0050] The first fan blade 10, the first blade 11, the first blade area 111, the first sub - blade 1111, the second blade area 112, the second sub - blade 1121,

[0051] The second fan blade 20, the second blade 21,

[0052] The first motor 30, the second motor 40, the air guide cylinder 50, the first mounting part 51, the second mounting part 52,

[0053] The air outlet grille 60, the first grille ring 61, the first diversion grille 611, the second grille ring 62, the second diversion grille 621,

[0054] The air inlet grille 70. Detailed implementation manners

[0055] To make the objectives, technical solutions and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are some, but not all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0056] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above - mentioned drawings are intended to cover non - exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above - mentioned drawings are used to distinguish different objects and are not used to describe a specific order or primary - secondary relationship.

[0057] Referring to "embodiments" in this application means that specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various positions in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0058] In the description of the present application, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", "linked", "attached" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0059] The term "and / or" in the present application is merely an association relationship describing associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in the present application generally represents an "or" relationship between the associated objects before and after.

[0060] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components shown in the drawings of the embodiments of the present application, as well as the overall thickness, length, width, etc. of the integrated device are only illustrative descriptions and should not constitute any limitation to the present application.

[0061] 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 to the present invention.

[0062] In the description of the present invention, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween.

[0063] In the description of the present invention, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the horizontal height of the first feature is higher than that of the second feature.

[0064] The term "a plurality of" appearing in the present application refers to two or more (including two).

[0065] The following refers to Figures 1 - 18Describe the fan 100 according to an embodiment of the present invention.

[0066] As Figure 1 , Figure 2 , Figure 5 and Figure 6 shown, the fan 100 includes a base and structures such as an air outlet assembly, an air inlet grille 70, and an air outlet grille 60 provided on the base.

[0067] Refer to Figure 3 , Figure 7 and Figure 12 shown, the fan 100 includes: a first fan blade 10 and a second fan blade 20. The first fan blade 10 has a first blade 11, the second fan blade 20 has a second blade 21. The first fan blade 10 and the second fan blade 20 are coaxially arranged. The first fan blade 10 is located in front of the second fan blade 20. The rotation directions of the first fan blade 10 and the second fan blade 20 are opposite. The diameter D1 of the first fan blade 10 is greater than the diameter D2 of the second fan blade 20, and the trailing edge of the first blade 11 is axially adjacent to the leading edge of the second blade 21.

[0068] Specifically, a plurality of first blades 11 are arranged in sequence along the circumferential direction, and a plurality of second blades 21 are arranged in sequence along the circumferential direction. The first fan blade 10 can rotate to drive the surrounding gas to flow during rotation, thereby forming an air flow with a certain flow rate. The second fan blade 20 can also rotate to drive the surrounding gas to flow during rotation, thereby forming an air flow with a certain flow rate.

[0069] Furthermore, it is defined that the leading edge of the blade is located on the air inlet side of the fan blade, and the trailing edge of the blade is located on the air outlet side of the fan blade. Correspondingly, the trailing edge of the first blade 11 of the first fan blade 10 is axially adjacent to the leading edge of the second blade 21 of the second fan blade 20, so that at least part of the air flow with a certain flow rate generated by the first fan blade 10 can further flow through the second fan blade 20 and can flow out after being decelerated or accelerated by the second fan blade 20.

[0070] It should be noted that the rotation directions of the first fan blade 10 and the second fan blade 20 are different. For example, the first fan blade 10 rotates clockwise and the second fan blade 20 rotates counterclockwise, or the first fan blade 10 rotates counterclockwise and the second fan blade 20 rotates clockwise. Furthermore, the rotation speeds of the first fan blade 10 and the second fan blade 20 can be the same to increase the air supply distance, or only one of the fan blades can rotate, such as only the first fan blade 10 rotates or only the second fan blade 20 rotates, to adjust the air volume.

[0071] More importantly, the first fan blade 10 and the second fan blade 20 can be rotated simultaneously with different rotation speeds. Exemplarily, the rotation speed of the first fan blade 10 is higher than that of the second fan blade 20. At this time, the rotation speed of the first fan blade 10 is fast and the rotation speed of the second fan blade 20 is slow. After the air flow is initially accelerated by the first fan blade 10, most of the air flow can flow out from the outer region of the second fan blade 20 (the non-coincident region between the axial projection of the first fan blade 10 and the axial projection of the second fan blade 20 is defined as the outer region). The air outlet area is large and the air flow velocity is low. The second fan blade 20 rotates at a low speed and can supplement the air flow in the middle region adjacent to the rotation axis of the fan 100 (the axial projection region where the second fan blade 20 is located is defined as the middle region), so as to supplement the air flow in the middle region while realizing the outward air dispersion, and improve the air outlet uniformity of the air dispersion mode while realizing the air dispersion mode. It is also possible to make the rotation speed of the first fan blade 10 lower than that of the second fan blade 20. At this time, the rotation speed of the first fan blade 10 is slow and the rotation speed of the second fan blade 20 is fast. After the air flow is initially accelerated by the first fan blade 10, it enters the region where the second fan blade 20 is located. The second fan blade 20 can perform secondary acceleration on the air flow, so as to reduce the air outlet area while increasing the air outlet speed, thereby realizing air concentration and increasing the air flow speed, so that in the air concentration mode, the air flow can act on a farther region or position.

[0072] In other words, by providing the first fan blade 10 and the second fan blade 20 in the present application, the rotation directions of the first fan blade 10 and the second fan blade 20 are different. The air outlet side of the first fan blade 10 is arranged adjacent to the air inlet side of the second fan blade 20, and the diameter of the second fan blade 20 is smaller than that of the first fan blade 10. Thus, a rotation speed difference exists between the first fan blade 10 and the second fan blade 20, and one of the first fan blade 10 and the second fan blade 20 rotates at a high speed and the other rotates at a low speed, so as to realize the switching between the large-range air dispersion in the outer region on the radial outer side and the small-range air concentration mode in the middle region on the radial inner side, enrich the air outlet mode of the fan 100, and improve the use experience.

[0073] In the air concentration mode, after the air flow passes through the first fan blade 10 and is initially accelerated, it enters the second fan blade 20 for secondary acceleration. The air flow speed is high and the air outlet area is small, which can simulate the air outlet of a circulation fan. In the air dispersion mode, after the air flow passes through the first fan blade 10 and is initially accelerated, most of the air flow directly flows out from the outer region. The second fan blade 20 rotates at a low speed and can supplement the air flow in the middle region, so that the air outlet area of the fan 100 is large and the gas flow velocity is low, which can simulate the air outlet of a floor fan.

[0074] Of course, the implementation of the air-concentrating mode and the air-diffusing mode of the fan 100 in the embodiments of the present application is not limited to this. In some other embodiments, the fan 100 includes a first fan blade 10 and a second fan blade 20. The first fan blade 10 has a first blade 11, and the second fan blade 20 has a second blade 21. The first fan blade 10 and the second fan blade 20 are coaxially arranged. The first fan blade 10 is located in front of the second fan blade 20. The diameter D1 of the first fan blade 10 is greater than the diameter D2 of the second fan blade 20, and the trailing edge of the first blade 11 is axially adjacent to the leading edge of the second blade 21.

[0075] Thus, the air outlet side of the first fan blade 10 is arranged adjacent to the air inlet side of the second fan blade 20, and the diameter of the second fan blade 20 is smaller than that of the first fan blade 10. Therefore, a rotational speed difference can exist between the first fan blade 10 and the second fan blade 20, and one of the first fan blade 10 and the second fan blade 20 rotates at a high speed and the other rotates at a low speed, so as to realize the switching between the large-range air diffusion in the outer region on the radial outside and the small-range air-concentrating mode in the middle region on the radial inside, enrich the air outlet mode of the fan 100, and improve the use experience.

[0076] See Figure 14 as shown in Figure 14 In the figure, Figures a and b show the simulated air flow streamline diagrams of the fan 100 at different angles in the air-concentrating mode. It can be seen from Figures a and b that in the air-concentrating mode, the air flow generated by the fan 100 is in a bundle shape and concentrated on the middle region corresponding to the second fan blade 20. Figures c and d show the simulated air flow cross-sectional velocity distribution diagrams of the fan 100 in the air-concentrating mode. It can be seen from Figures c and d that the air flow velocity in the middle region is faster, and the air flow velocity in the region adjacent to the rotation axis is fast and the area is small.

[0077] See Figure 15 as shown in Figure 15 In the figure, Figures e and f show the simulated air flow streamline diagrams of the fan 100 at different angles in the air-diffusing mode. It can be seen from Figures e and f that in the air-diffusing mode, the air flow generated by the fan 100 is in a divergent shape and covers most of the radial region of the fan 100 corresponding to the first fan blade 10 and the second fan blade 20, that is, the middle region plus the outer region. Figures g and h show the simulated air flow cross-sectional velocity distribution diagrams of the fan 100 in the air-diffusing mode. It can be seen from Figures g and h that the overall air flow velocity is slower, the air outlet area is large, and the gas flow velocity is small.

[0078] According to the fan 100 of the embodiment of the present application, the rotation directions of the first fan blade 10 and the second fan blade 20 are opposite, the diameter of the first fan blade 10 is larger than that of the second fan blade 20, and the first fan blade 10 and the second fan blade 20 can be controlled to rotate simultaneously or independently to adjust the air volume, or there is a rotational speed difference between the first fan blade 10 and the second fan blade 20 to achieve the air gathering mode and the air dispersing mode, so that the fan 100 of the present application can have the air outlet characteristics of a circulation fan and a floor fan, enrich the air outlet modes, meet different usage requirements, and improve the usage experience.

[0079] It should be noted that the structure of the fan 100 in the embodiment of the present application is not limited to this. In the first embodiment, the present application sets the first fan blade 10 and the second fan blade 20, and makes the diameter of the first fan blade 10 larger than that of the second fan blade 20. Furthermore, due to the rotational speed difference between the first fan blade 10 and the second fan blade 20, the air dispersing mode and the air gathering mode can be correspondingly achieved. In the second embodiment, an air outlet grille cover 60 with multiple grille rings can be further set in cooperation with the first fan blade 10 and the second fan blade 20 to improve the air outlet effects of the air gathering mode and the air dispersing mode. In the third embodiment, on the basis of the first embodiment or the second embodiment, the first fan blade 10 can be further set as a double-layer fan blade structure to strengthen the air outlet effect of the fan 100.

[0080] The inner and outer directions involved in the present application are relative concepts. Relatively, the vicinity of the rotation axis is the inner, and the distance from the rotation axis is the outer. The front and rear directions are also relative concepts. The second fan blade 20 is located behind the first fan blade 10, and the first fan blade 10 is located in front of the second fan blade 20.

[0081] See Figure 1 、 Figure 2 and Figure 3 As shown, in the first embodiment, the fan 100 is provided with the first fan blade 10 and the second fan blade 20 with different diameters, and is equipped with a conventional air outlet grille cover 60. See Figure 5 、 Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 and Figure 11 As shown, in the second embodiment, while setting the first fan blade 10 and the second fan blade 20 with different diameters, an air outlet grille cover 60 with at least two grille rings is further set. See Figure 12 and Figure 13 As shown, in the third embodiment, the first fan blade 10 and the second fan blade 20 with different diameters can be set, and the first fan blade 10 is configured as a double-layer blade structure. Correspondingly, in the third embodiment, the air outlet grille cover 60 can be a conventional grille cover or an air outlet grille cover 60 with the same structure as that in the second embodiment.

[0082] Exemplarily, in the second embodiment, the air outlet assembly includes a first fan blade 10 and a second fan blade 20. The fan 100 further includes an air outlet grille 60. The air outlet grille 60 is disposed on the air outlet side of the second fan blade 20 and has a first grille ring 61 and a second grille ring 62 arranged in sequence in the radial direction. The first grille ring 61 is used to diverge the air flow away from the rotation axis, and the second grille ring 62 is used to converge the air flow toward the rotation axis.

[0083] Specifically, as Figure 8 , Figure 9 and Figure 10 shown, the second grille ring 62 is disposed closer to the rotation axis than the first grille ring 61, corresponding to the middle region where the second fan blade 20 is located. The first grille ring 61 is disposed farther from the rotation axis than the second grille ring 62, corresponding to the outer region where the first fan blade 10 and the second fan blade 20 do not overlap in the axial projection.

[0084] It can be understood that, referring to Figure 16 and Figure 17 shown, the first grille ring 61 can guide the air flow to flow outward relative to the rotation axis, and the second grille ring 62 can guide the air flow to converge inward relative to the rotation axis. Exemplarily: the first grille ring 61 can guide the air flow that flows at an angle of 20° outward along the rotation axis to flow outward at 25° or 30°, etc., to improve the air dispersion effect, while the second grille ring 62 can change the air flow that originally flows at an angle of 20° outward along the rotation axis into an air flow that flows outward at 10° or 0° angles, to achieve the convergence of the air flow and improve the air concentration effect.

[0085] In the air concentration mode, the rotational speed of the second fan blade 20 is higher than that of the first fan blade 10. After the air flow is initially accelerated by the first fan blade 10, it flows into the second fan blade 20. The second fan blade 20 further accelerates the air flow and flows out after being rectified by the second grille ring 62 of the air outlet grille 60. The rectification effect of the second grille ring 62 is to converge the air flow toward the rotation axis, which can effectively accelerate the air flow speed and further reduce the air outlet area to improve the air concentration effect.

[0086] In the air dispersion mode, the rotational speed of the first fan blade 10 is higher than that of the second fan blade 20. After the air flow is accelerated by the first fan blade 10, most of the air flow directly enters the outer region, and the outer region corresponds to the first grille ring 61. The first grille ring 61 is used to diverge the air flow away from the rotation axis, which can further diverge the air flow, so that the air flow flows out outward at a certain angle with the rotation axis, further increasing the air outlet area and reducing the air flow speed to improve the air dispersion effect.

[0087] According to the fan 100 of the embodiment of the present application, by providing an air outlet grille 60, and at least having a first grille ring 61 for diverging the airflow away from the rotation axis and a second grille ring 62 for converging the airflow towards the rotation axis on the air outlet grille 60, it is possible to implement a diffused air mode and a concentrated air mode, so as to enrich the air outlet modes and improve the user experience. At the same time, during the operation of the fan 100, the airflow in the diffused air mode can be made more divergent to improve the air outlet uniformity, and the airflow in the concentrated air mode can be made more concentrated to improve the concentrated air effect.

[0088] Exemplarily, in the third embodiment, the first fan blade 10 has a first blade 11, the first blade 11 has a first blade region 111 and a second blade region 112 arranged in sequence along the radial direction, the second fan blade 20 has a second blade 21, and the axial projection of the second blade 21 at least partially coincides with that of the second blade region 112.

[0089] Among them, referring to Figure 12 and Figure 13 as shown, the second blade region 112 and the second blade 21 are at least partially opposite in the axial direction, and the first blade region 111 is outside the axial projection range of the second blade 21.

[0090] In the concentrated air mode, the rotational speed of the second fan blade 20 is higher than that of the first fan blade 10. After the airflow is initially accelerated through the first blade region 111 and the second blade region 112, it flows into the second fan blade 20, and the second fan blade 20 further accelerates the airflow, which can effectively increase the airflow speed and further reduce the air outlet area to improve the concentrated air effect.

[0091] In the diffused air mode, the rotational speed of the first fan blade 10 is higher than that of the second fan blade 20. After the airflow is accelerated through the first blade region 111 and the second blade region 112, most of the airflow generated by the first blade region 111 directly enters the external area, and the airflow generated by the second blade region 112 flows into the second fan blade 20. The second fan blade 20 further rotates to generate supplementary airflow to supplement the airflow in the middle area, so that the air outlet uniformity in the diffused air mode is better, and both the external area and the middle area have diffused airflows with slower air velocities, effectively reducing the airflow speed to improve the diffused air effect.

[0092] According to the fan 100 of the embodiments of the present application, the rotation directions of the first fan blade 10 and the second fan blade 20 are opposite, the diameter of the first fan blade 10 is larger than that of the second fan blade 20, the first blade area 111 of the first fan blade 10 is located outside the second fan blade 20, and the second blade area 112 is arranged corresponding to the second fan blade 20. It is possible to control the first fan blade 10 and the second fan blade 20 to rotate simultaneously or separately to adjust the air volume, or there is a rotational speed difference between the first fan blade 10 and the second fan blade 20 to achieve the air gathering mode and the air scattering mode, and the air volume supplement or the air flow acceleration is effectively achieved through the second blade area 112, so that the fan 100 of the present application can have the air outlet characteristics of a circulation fan and a floor fan, enrich the air outlet mode, meet different usage requirements, and improve the usage experience.

[0093] As Figure 4 and Figure 13 shown, according to some embodiments of the present application, the diameter D1 of the first fan blade 10 and the diameter D2 of the second fan blade 20 satisfy: 0.4 ≤ D2 / D1 ≤ 0.9, and the diameter of the second blade area 112 is less than or equal to the diameter of the second fan blade 20, and the diameter of the first blade area 111 is equal to the diameter of the first fan blade 10.

[0094] Exemplarily, the diameter ratio of the second fan blade 20 to the first fan blade 10 can be 0.4, 0.5, 0.6, 0.7, 0.8 or 0.9, etc.

[0095] It should be noted that when the diameter ratio of the second fan blade 20 to the first fan blade 10 is too small, the second fan blade 20 is small. In the air gathering mode, the air flow converges in an area with too small an air outlet area, and the air outlet area is too small, affecting the usage experience. In the air scattering mode, the air flow supplement effect on the middle area is also poor. When the diameter ratio of the second fan blade 20 to the first fan blade 10 is too large, the second fan blade 20 is large. In the air gathering mode, the air flow converges in an area with too large an air outlet area, resulting in a poor air gathering effect. In the air scattering mode, the area for air flow supplement is too large, while the external area for divergent air outlet is too small, resulting in a poor air scattering effect and also reducing the usage experience.

[0096] Therefore, by making the diameter ratio of the second fan blade 20 to the first fan blade 10 fall within the range of 0.4 to 0.9, the sizes of the first fan blade 10 and the second fan blade 20 are more reasonable. The more reasonable-sized first fan blade 10 and second fan blade 20 can balance the air gathering effect and the air scattering effect, so that the air outlet effects of the fan 100 in the air gathering mode and the air scattering mode are both better, improving the usage experience.

[0097] Furthermore, the diameter of the first blade area 111 is greater than or equal to the diameter of the first fan blade 10, and the diameter of the second blade area 112 is the same as the diameter of the second fan blade 20. The second blade area 112 can assist the second fan blade 20 in air flow supplement. The diameter of the second blade area 112 is less than or equal to the diameter of the first fan blade 10, which can avoid excessive diameter of the second blade area 112 causing turbulence while improving the air outlet uniformity in the air-diffusing mode, so as to improve the air outlet effect.

[0098] As Figure 11 and Figure 13 shown, in some embodiments, the extending direction from the leading edge to the trailing edge of the first sub-blade 1111 in the first blade area 111 is opposite to the extending direction from the leading edge to the trailing edge of the second blade 21, and the extending direction from the leading edge to the trailing edge of the second sub-blade 1121 in the second blade area 112 is the same as the extending direction from the leading edge to the trailing edge of the first sub-blade 1111 in the first blade area 111.

[0099] Specifically, the first sub-blade 1111 in the first blade area 111 and the second sub-blade 1121 in the second blade area 112 can be continuously arranged. The first fan blade 10 can have a first ring and a second ring arranged concentrically. The radially inner end of the second sub-blade 1121 is connected to the first ring, the radially outer end of the second sub-blade 1121 is connected to the inner wall of the second ring, the radially inner end of the first sub-blade 1111 is connected to the outer wall of the second ring, and the inner diameter of the second ring is the same as the diameter of the second blade 21, so that the diameter of the second blade area 112 is the same as the diameter of the second fan blade 20. Furthermore, the rotation direction of the first sub-blade 1111 is opposite to the rotation direction of the second blade 21, and the rotation direction of the second sub-blade 1121 is the same as the rotation direction of the first sub-blade 1111.

[0100] Thus, when the first fan blade 10 rotates clockwise or counterclockwise to disturb the air flow, the corresponding second fan blade 20 rotates counterclockwise or clockwise to disturb the air flow. Therefore, in the air-diffusing mode, the air flow generated by the first fan blade 10 can diverge outward along the rotation axis, and in the air-concentrating mode, the air flow generated by the first fan blade 10 can converge inward along the rotation axis, improving the air flow guiding effect and making the air outlet effects in both the air-concentrating mode and the air-diffusing mode better.

[0101] It should be noted that in the first embodiment, the rotation direction of the first blade 11 is opposite to that of the second blade 21. The first fan blade 10 has a first circular ring. The inner end of the blade of the first blade 11 is connected to the first circular ring, and at least part of the first blade 11 faces the second fan blade 20. In the third embodiment, the first sub-blade 1111 is correspondingly located in the outer region, and the second sub-blade 1121 is correspondingly located in the middle region and at least partially overlaps with the second fan blade 20. The first fan blade 10 and the second fan blade 20 can disturb the air flow in opposite directions to achieve the air-gathering mode and the air-dispersing mode.

[0102] According to some embodiments of the present application, the distance L1 between the trailing edge of the blade of the first sub-blade 1111 in the first blade area 111 and the leading edge of the blade of the second blade 21 satisfies: 0 < L1 < 80 mm (that is, the first blade 11 or the first blade area 111 is spaced apart from the second blade 21 in the front-rear direction).

[0103] That is to say, as Figure 11 shown, it can be seen from the cross-sectional view of the fan 100 that the distance between the trailing edge of the blade of the first blade 11 in the first embodiment or the trailing edge of the blade of the first sub-blade 1111 in the third embodiment and the leading edge of the blade of the second blade 21 is in the range of 0 to 80 mm.

[0104] Exemplarily, the axial distance between the first blade 11 and the second blade 21 is 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 60 mm, 70 mm, etc., making the distance between the first blade 11 and the second blade 21 more reasonable. On the one hand, the space occupied by the fan 100 can be reduced; on the other hand, the distance between the first blade 11 and the second blade 21 is more reasonable, and the flow path for the air flow generated by the first fan blade 10 to flow into the second fan blade 20 or directly flow out of the fan 100 is shorter, which can improve the air outlet effect and the cooperation effect between the first fan blade 10 and the second fan blade 20, and further improve the air outlet effect of the fan 100 in the air-gathering mode and the air-dispersing mode.

[0105] It should be noted that the first blade 11 or the first blade area 111 is spaced apart from the second blade 21 in the front-rear direction, which can ensure that after the air flow generated by the first fan blade 10 is initially accelerated by the first fan blade 10, it further flows to the outer region or the middle region where the second fan blade 20 is located, and can avoid the interference between the flow disturbance effect of the second fan blade 20 and the flow disturbance effect of the first fan blade 10 when both the first fan blade 10 and the second fan blade 20 rotate, so as to improve the air outlet effect of the fan 100.

[0106] It can be understood that as Figure 3 、 Figure 7 and Figure 12As shown, in some embodiments, the fan 100 further includes: a power source for driving the first fan blade 10 and the second fan blade 20 to rotate.

[0107] Specifically, the power source may include: a first motor 30 and a second motor 40. The first motor 30 is power-connected to the first fan blade 10, and the second motor 40 is power-connected to the second fan blade 20 and is adapted to control the rotation speeds of the first fan blade 10 and the second fan blade 20 respectively.

[0108] Thus, the first fan blade 10 and the second fan blade 20 can be driven by the first motor 30 and the second motor 40 respectively, so that the control of the rotation speeds of the first fan blade 10 and the second fan blade 20 is simpler and more convenient, and the structure of the fan 100 is simpler.

[0109] Of course, the structure of the power source in the embodiments of the present application is not limited thereto. In some other embodiments, a single motor may also be used to drive the first fan blade 10 and the second fan blade 20 to rotate respectively. The motor drives the first fan blade 10 and the second fan blade 20 through two sets of transmission components, and both sets of transmission components have multiple speed ratios. Based on the required rotation speeds of the first fan blade 10 and the second fan blade 20, the speed ratios of the two sets of transmission components are selected respectively, so as to realize the rotation speed difference between the first fan blade 10 and the second fan blade 20, and the same technical effects as those of the first motor 30 and the second motor 40 can also be achieved.

[0110] As Figure 1 、 Figure 2 、 Figure 5 and Figure 6 As shown, the fan 100 further includes: a wind guide cylinder 50. The wind guide cylinder 50 has a first mounting portion 51 and a second mounting portion 52. The first mounting portion 51 is used for mounting the first motor 30, and the second mounting portion 52 is used for mounting the second motor 40.

[0111] Specifically, the wind guide cylinder 50 has an outer cylinder and an inner cylinder. The inner cylinder is connected to the outer cylinder by several radial rods. The diameter of the outer cylinder is larger than the diameter of the first fan blade 10. A partition may be provided inside the inner cylinder to define the first mounting portion 51 and the second mounting portion 52 on both sides of the partition. The motor housing of the first motor 30 may be arranged in the first mounting portion 51, and the motor shaft is connected to the first fan blade 10 through a coupling or directly. The motor housing of the second motor 40 may be arranged in the second mounting portion 52, and the motor shaft is connected to the second fan blade 20 through a coupling or directly, so as to drive the first fan blade 10 and the second fan blade 20 to rotate by the first motor 30 and the second motor 40 respectively.

[0112] Thus, by providing the air guide tube 50, the assembly structure of the first motor 30, the second motor 40, the first fan blade 10 and the second fan blade 20 is simpler, the overall layout difficulty of the fan 100 is lower, the axial space occupation is more reasonable, the size of the fan 100 is smaller, and the appearance aesthetics is higher.

[0113] See Figure 8 and Figure 9 as shown,

[0114] The ratio of the outer diameter D3 of the first grille ring 61 to the diameter D1 of the first fan blade 10 satisfies: 1 ≤ D3 / D1 ≤ 1.1, and the ratio of the outer diameter D4 of the second grille ring 62 to the diameter D2 of the second fan blade 20 satisfies: 1 ≤ D4 / D2 ≤ 1.1.

[0115] Thus, the first grille ring 61 is arranged corresponding to the outer region, and the second grille ring 62 is arranged corresponding to the middle region, so that the first grille ring 61 can guide the air flow exiting from the outer region, making the divergent air flow further exit outward, improving the air dispersion effect, and the first grille ring 61 can guide the air flow exiting from the middle region, making the converging air flow further converge inward, improving the air converging effect.

[0116] Wherein, the outer diameter of the first grille ring 61 is slightly larger than or equal to the diameter of the first fan blade 10, and the second grille ring 62 is slightly larger than or equal to the diameter of the second fan blade 20. On the one hand, the air guiding effects of the first grille ring 61 and the second grille ring 62 can be ensured, and on the other hand, the outer dimension of the air outlet grille cover 60 can be prevented from being too large, so that the internal components of the fan 100 are arranged more compactly and the space occupation is more reasonable.

[0117] As Figure 10 shown, further, the angles formed by the multiple first guiding grilles 611 in the first grille ring 61 with the axis are 5° to 90° (including the end values), and the angles formed by the multiple second guiding grilles 621 in the second grille ring 62 with the axis are 0° to 5° (including the end values).

[0118] Specifically, the axis refers to the rotation axis. A plurality of first guiding grilles 611 are arranged at intervals in the circumferential direction in the first grille ring 61, and a plurality of second guiding grilles 621 are arranged at intervals in the circumferential direction in the second grille ring 62. The first guiding grilles 611 and the second guiding grilles 621 can be generally arc-shaped and both have an included angle with the axis.

[0119] Among them, the included angle between the first guiding grille 611 and the axis is Figure 10the α angle, and the angle formed by the first flow guiding grille 611 and the axis can be any value between 5° and 90° (such as: 5°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, 90°, etc.), the angle formed by the second flow guiding grille 621 and the axis can be 0°, 1°, 2°, 3°, 4°, 5°, etc., and the first flow guiding grille 611 is inclined outward, and the second flow guiding grille 621 is inclined inward.

[0120] Thus, the inclination angles of the first flow guiding grille 611 and the second flow guiding grille 621 are made more reasonable. The inclination angle of the first flow guiding grille 611 is more reasonable, which realizes the outward diversion of the divergent air flow and improves the air dispersion effect. The angle of the second flow guiding grille 621 is more reasonable, which realizes the inward diversion of the converging air flow and improves the air converging effect.

[0121] It should be noted that if the inclination angle of the first flow guiding grille 611 is too large, the air flow will directly impact the outer edge of the air guiding cylinder 50 or the air outlet grille 60. If the angle is too small, the diversion effect will be poor. If the inclination angle of the second flow guiding grille 621 is too large, the air flow will collide, resulting in a decrease in the air flow velocity and an increase in turbulence, affecting the air converging and outlet effect and reducing the user experience.

[0122] In Figure 10 In the specific embodiment shown, further, the thickness of the windward side of the grille of the first flow guiding grille 611 is W1, and the thickness of the air outlet side of the grille of the first flow guiding grille 611 is W2, and it satisfies: 1.5 mm ≤ W1 ≤ 5 mm, 1.5 mm ≤ W2 ≤ 5 mm, and the width L2 of the first flow guiding grille 611 satisfies: 4 mm ≤ L2 ≤ 15 mm.

[0123] Specifically, the thickness of the windward side end and the air outlet side end of the grille plate of the first flow guiding grille 611 is 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm or 5 mm, etc. The specific shape of the grille plate is not limited, but the thickness of the windward side end and the air outlet side end needs to satisfy the above value range, and the thickness of the windward side and the air outlet side can be the same or different.

[0124] Thus, the thickness of the windward side end and the air outlet side end of the first flow guiding grille 611 can be made more reasonable to ensure the structural strength and stability of the flow guiding grille, and to avoid the thickness of the first flow guiding grille 611 being too low, resulting in shaking during the air flow diversion process, reducing the diversion effect and causing problems, and avoiding the thickness of the first flow guiding grille 611 being too large, increasing the wind resistance, reducing the gas flow velocity, and affecting the air outlet effect.

[0125] Furthermore, the width of the first flow guiding grille 611 can be 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, etc., which can prevent the width of the first flow guiding grille 611 from being too short, resulting in too short a flow guiding path length, and can also prevent the width of the first flow guiding grille 611 from being too long, resulting in too long a flow guiding path length, so as to ensure the flow guiding effect and take into account the material cost of the first flow guiding grille 611, reducing the production cost of the fan 100.

[0126] It should be noted that the fan 100 also has an air inlet grille 70. The air inlet grille 70 is arranged at one axial end of the air guiding cylinder 50, and the air outlet grille 60 is arranged at the other axial end of the air guiding cylinder 50 to prevent foreign objects from entering the fan 100 and improve the stability and reliability of the fan 100.

[0127] It should be noted that the inclination direction of the second flow guiding grille 621 of the second grille ring 62 is opposite to the extending direction of the first blade 11 of the first fan blade 10.

[0128] Specifically, in the second embodiment, the inclination direction of the second flow guiding grille 621 is opposite to the extending direction of the first blade 11, while in the solution of the first fan blade 10 of the third embodiment, the inclination direction of the second flow guiding grille 621 is opposite to the extending directions of the first sub-blade 1111 and the second sub-blade 1121.

[0129] In other words, the inclination direction of the grille leaf shape of the second flow guiding grille 621 is opposite to the inclination direction of the first blade 11 of the first fan blade 10. Relative to the rotation direction of the first fan blade 10, the leading edge (air inlet side) of the first blade 11 is in a position ahead in the rotation direction, and the trailing edge (air outlet side) is behind the leading edge, that is, the blade leaf shape inclines in the rotation direction. And the leading edge of the grille of the second flow guiding grille 621 is in a position behind in the rotation direction of the first fan blade 10, behind the trailing edge of the grille, so that the second flow guiding grille 621 can guide the air flow generated by the first fan blade 10 towards the rotation axis. By making the inclination direction of the second flow guiding grille 621 opposite to that of the first blade 11, the air flow generated by the first fan blade 10 can be specifically guided, effectively improving the air gathering effect.

[0130] As Figures 1 - 4 shown, in the first embodiment, the fan 100 includes a first fan blade 10, a second fan blade 20, a first motor 30, a second motor 40, an air outlet grille 60, an air inlet grille 70, and an air guiding cylinder 50.

[0131] Among them, the first motor 30 is connected to the first fan blade 10, the second motor 40 is connected to the second fan blade 20, the first motor 30 is arranged in the first installation part 51 of the air guide cylinder 50, the second motor 40 is arranged in the second installation part 52 of the air guide cylinder 50, the air outlet grille 60 is covered on one end of the air guide cylinder 50, and the air inlet grille 70 is covered on the other end of the air guide cylinder 50.

[0132] The diameter of the first fan blade 10 is larger than that of the second fan blade 20, and the air outlet grille 60 is configured as a grille structure with a conventional grille.

[0133] In the first embodiment, by setting the first fan blade 10 and the second fan blade 20 with different diameters, and through the reverse rotation and speed difference of the first fan blade 10 and the second fan blade 20, the air gathering mode and the air scattering mode are realized, enriching the air outlet modes of the fan 100 and providing the use experience of the fan 100.

[0134] As Figures 5 - 11 shown, in the second embodiment, the fan 100 includes a first fan blade 10, a second fan blade 20, a first motor 30, a second motor 40, an air outlet grille 60, an air inlet grille 70, and an air guide cylinder 50.

[0135] Among them, the first motor 30 is connected to the first fan blade 10, the second motor 40 is connected to the second fan blade 20, the first motor 30 is arranged in the first installation part 51 of the air guide cylinder 50, the second motor 40 is arranged in the second installation part 52 of the air guide cylinder 50, the air outlet grille 60 is covered on one end of the air guide cylinder 50, and the air inlet grille 70 is covered on the other end of the air guide cylinder 50.

[0136] The diameter of the first fan blade 10 is larger than that of the second fan blade 20, and the air outlet grille 60 is configured to have a first grille ring 61 and a second grille ring 62. The first grille ring 61 is used for guiding air away from the rotation axis, and the second grille ring 62 is used for guiding air towards the rotation axis.

[0137] In the second embodiment, by setting the first fan blade 10 and the second fan blade 20 with different diameters, and through the reverse rotation and speed difference of the first fan blade 10 and the second fan blade 20, in cooperation with the first grille ring 61 and the second grille ring 62, the air gathering mode and the air scattering mode are realized, enriching the air outlet modes of the fan 100 and providing the use experience of the fan 100.

[0138] As Figure 12 and Figure 13 shown, in the third embodiment, the fan 100 includes a first fan blade 10, a second fan blade 20, a first motor 30, a second motor 40, an air outlet grille 60, an air inlet grille 70, and an air guide cylinder 50.

[0139] Among them, the first motor 30 is connected to the first fan blade 10, the second motor 40 is connected to the second fan blade 20. The first motor 30 is arranged in the first installation part 51 of the air guide cylinder 50, the second motor 40 is arranged in the second installation part 52 of the air guide cylinder 50, the air outlet grille 60 is covered on one end of the air guide cylinder 50, and the air inlet grille 70 is covered on the other end of the air guide cylinder 50.

[0140] The diameter of the first fan blade 10 is larger than that of the second fan blade 20, and the air outlet grille 60 is configured as a conventional grille with ordinary grilles. The first blade 11 includes a first blade area 111 and a second blade area 112. The second blade area 112 coincides with the axial projection of the second fan blade 20, and the first blade area 111 is located outside the axial projection range of the second fan blade 20.

[0141] In the third embodiment, by setting the first fan blade 10 and the second fan blade 20 with different diameters, and through the reverse rotation and speed difference of the first fan blade 10 and the second fan blade 20, and cooperating with the auxiliary air supply of the second blade area 112, the air gathering mode and the air scattering mode are realized, enriching the air outlet modes of the fan 100 and providing the use experience of the fan 100.

[0142] Preferably, the fan 100 adopts the first fan blade 10 and the second fan blade 20. The first fan blade 10 has a first blade area 111 and a second blade area 112, and the diameter of the first fan blade 10 is larger than that of the second fan blade 20. At the same time, the air outlet grille 60 with a first grille ring 61 and a second grille ring 62 is set to achieve better air gathering effect and air scattering effect.

[0143] Other components and operations of the fan 100 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 here.

[0144] As Figure 18 shown, the control method of the fan 100 according to the embodiments of the present application, the control method includes:

[0145] Obtain the air outlet mode of the fan 100, and the air outlet mode includes an air scattering mode and an air gathering mode;

[0146] According to the air outlet mode, adjust the rotation speeds of the first fan blade 10 and the second fan blade 20 so that there is a speed difference between the first fan blade 10 and the second fan blade 20.

[0147] Specifically, the air outlet modes may at least include a diffused air mode and a concentrated air mode, and may also include a large air volume mode, etc. For example, in the large air volume mode, both the first fan blade 10 and the second fan blade 20 can output air volume at a high rotational speed. When the fan 100 switches to the diffused air mode or the concentrated air mode, the rotational speeds of the first fan blade 10 and the second fan blade 20 are adjusted to generate a rotational speed difference between the first fan blade 10 and the second fan blade 20, and through the rotational speed difference, the concentrated air mode and the diffused air mode are realized, enriching the air outlet modes of the fan 100 and improving the user experience of the fan 100.

[0148] It should be noted that adjusting the rotational speeds of the first fan blade 10 and the second fan blade 20 according to the air outlet mode specifically includes:

[0149] In the diffused air mode, the rotational speed of the first fan blade 10 is lower than that of the second fan blade 20;

[0150] In the concentrated air mode, the rotational speed of the second fan blade 20 is lower than that of the first fan blade 10.

[0151] Specifically, in the concentrated air mode, the rotational speed of the second fan blade 20 is higher than that of the first fan blade 10. After the air flow is initially accelerated by the first blade 11, it flows into the second fan blade 20, and the second fan blade 20 further accelerates the air flow, which can effectively increase the air flow speed and further reduce the air outlet area to improve the concentrated air effect.

[0152] In the diffused air mode, the rotational speed of the first fan blade 10 is higher than that of the second fan blade 20. After the air flow is accelerated by the first blade 11, most of the air flow generated by the first blade 11 directly enters the external area, and the second fan blade 20 further rotates to generate supplementary air flow to supplement the air flow in the internal area, so that the air outlet uniformity in the diffused air mode is better, and both the external area and the internal area have diffused air flows with a slower gas flow speed, effectively reducing the air flow speed to improve the diffused air effect.

[0153] It can be understood that both the diffused air mode and the concentrated air mode have multiple gears, and the control method further includes:

[0154] In the diffused air mode, the rotational speed difference between the first fan blade 10 and the second fan blade 20 is 100 r / min - 250 r / min;

[0155] In the concentrated air mode, the rotational speed difference between the first fan blade 10 and the second fan blade 20 is 500 r / min - 800 r / min, and both are positively correlated with the gear.

[0156] That is to say, in the concentrated air mode, the rotational speed of the first fan blade 10 is low, and the rotational speed difference is within the range of 100 r / min - 250 r / min. In the diffused air mode, the rotational speed of the first fan blade 10 is high, and the rotational speed difference is 500 r / min - 800 r / min, so as to achieve a better concentrated air effect and a better diffused air effect.

[0157] Among them, the fact that the rotational speed difference is positively correlated with the gear means that there can be multiple gears in the air-diffusing mode, such as the first gear to the fifth gear. In the first gear to the fifth gear, the rotational speeds of the first fan blade 10 and the second fan blade 20 both increase or decrease arithmetically. Correspondingly, the rotational speed difference increases or decreases arithmetically within the range of 100 r / min to 250 r / min. For example, in the first gear, the rotational speed difference is 100 r / min, and in the sixth gear, the rotational speed difference is 250 r / min. There can also be multiple gears in the air-concentrating mode, such as the first gear to the fifth gear. In the first gear to the fifth gear, the rotational speeds of the first fan blade 10 and the second fan blade 20 both increase or decrease arithmetically. Correspondingly, the rotational speed difference increases or decreases arithmetically within the range of 500 r / min to 800 r / min. For example, in the first gear, the rotational speed difference is 500 r / min, and in the sixth gear, the rotational speed difference is 800 r / min.

[0158] In the description of this specification, the descriptions with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples" 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 can be combined in a suitable manner in any one or more embodiments or examples.

[0159] 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. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A fan, characterized in that, comprising: a first fan blade having a first blade; a second fan blade, the first fan blade and the second fan blade are coaxially arranged, the first fan blade is located in front of the second fan blade, the rotation directions of the first fan blade and the second fan blade are opposite, the second fan blade has a second blade, the diameter D1 of the first fan blade is greater than the diameter D2 of the second fan blade, and the trailing edge of the first blade is axially adjacent to the leading edge of the second blade.

2. A fan, characterized in that, comprising: a first fan blade having a first blade; a second fan blade, the first fan blade and the second fan blade are coaxially arranged, the first fan blade is located in front of the second fan blade, the second fan blade has a second blade, the diameter D1 of the first fan blade is greater than the diameter D2 of the second fan blade, and the trailing edge of the first blade is axially adjacent to the leading edge of the second blade.

3. The fan according to claim 1 or 2, characterized in that, the diameters D1 of the first fan blade and D2 of the second fan blade satisfy: 0.4 ≤ D2 / D1 ≤ 0.

9.

4. The fan according to claim 1 or 2, characterized in that, the extending direction from the leading edge to the trailing edge of the first blade is opposite to the extending direction from the leading edge to the trailing edge of the second blade.

5. The fan according to claim 1 or 2, characterized in that, the distance L1 between the trailing edge of the first blade and the leading edge of the second blade satisfies: 0 < L1 < 80 mm.

6. The fan according to claim 1 or 2, characterized in that, further comprising: a power source for driving the first fan blade and the second fan blade to rotate.

7. The fan according to claim 6, characterized in that, the power source comprises: a first motor and a second motor, the first motor is power-connected to the first fan blade, the second motor is power-connected to the second fan blade, and is adapted to separately control the rotation speeds of the first fan blade and the second fan blade.

8. The fan according to claim 7, characterized in that, further comprising: a wind guide cylinder having a first mounting portion and a second mounting portion thereon, the first mounting portion is used for mounting the first motor, and the second mounting portion is used for mounting the second motor.

9. The fan according to claim 8, characterized in that, further comprising: an air outlet grille cover disposed on the air outlet side of the first fan blade and having a first grille ring and a second grille ring sequentially arranged in the radial direction, the first grille ring is used for diverging the air flow away from the rotation axis, and the second grille ring is used for converging the air flow towards the rotation axis.

10. The fan according to claim 9, characterized in that, the ratio of the outer diameter D3 of the first grille ring to the diameter D1 of the first fan blade satisfies: 1 ≤ D3 / D1 ≤ 1.1, and the ratio of the outer diameter D4 of the second grille ring to the diameter D2 of the second fan blade satisfies: 1 ≤ D4 / D2 ≤ 1.

1.

11. The fan according to claim 9, characterized in that, The angles formed by the multiple first flow guiding grilles within the first grille ring and the axis are 5° to 90°, and the angles formed by the multiple second flow guiding grilles within the second grille ring and the axis are 0° to 5°.

12. The fan according to claim 11, wherein, the thickness of the windward side of the grille of the first flow guiding grille is W1, and the thickness of the air outlet side of the grille of the first flow guiding grille is W2, and it satisfies: 1.5 mm ≤ W1 ≤ 5 mm, 1.5 mm ≤ W2 ≤ 5 mm.

13. The fan according to claim 11, wherein, the width L2 of the first flow guiding grille satisfies: 4 mm ≤ L2 ≤ 15 mm.

14. A control method for a fan, the control method being suitable for controlling the fan according to any one of claims 1 - 13, wherein, it includes: obtaining the air outlet mode of the fan, the air outlet mode including a diffused air mode and a concentrated air mode; adjusting the rotational speeds of the first fan blade and the second fan blade according to the air outlet mode so that there is a rotational speed difference between the first fan blade and the second fan blade.

15. The control method for the fan according to claim 14, wherein, the adjusting the rotational speeds of the first fan blade and the second fan blade according to the air outlet mode specifically includes: in the diffused air mode, the rotational speed of the first fan blade is lower than that of the second fan blade; in the concentrated air mode, the rotational speed of the second fan blade is lower than that of the first fan blade.

16. The control method for the fan according to claim 15, wherein, both the diffused air mode and the concentrated air mode have multiple gears, and the control method further includes: in the diffused air mode, the rotational speed difference between the first fan blade and the second fan blade is 100 r / min to 250 r / min; in the concentrated air mode, the rotational speed difference between the first fan blade and the second fan blade is 500 r / min to 800 r / min, and both are positively correlated with the gears.

Images