WO2017128803A1 - 风轮及家用电器 - Google Patents

风轮及家用电器 Download PDF

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Publication number
WO2017128803A1
WO2017128803A1 PCT/CN2016/105079 CN2016105079W WO2017128803A1 WO 2017128803 A1 WO2017128803 A1 WO 2017128803A1 CN 2016105079 W CN2016105079 W CN 2016105079W WO 2017128803 A1 WO2017128803 A1 WO 2017128803A1
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WIPO (PCT)
Prior art keywords
blades
hub
wind wheel
blade
area
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PCT/CN2016/105079
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English (en)
French (fr)
Inventor
叶似锦
罗伟锦
潘新运
马列
Original Assignee
广东美的环境电器制造有限公司
美的集团股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Priority claimed from CN201610865361.1A external-priority patent/CN106930974B/zh
Application filed by 广东美的环境电器制造有限公司, 美的集团股份有限公司 filed Critical 广东美的环境电器制造有限公司
Priority to JP2018539071A priority Critical patent/JP2019504958A/ja
Publication of WO2017128803A1 publication Critical patent/WO2017128803A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades

Definitions

  • the invention relates to the field of household appliances, in particular to a wind wheel and a household appliance.
  • the existing double-window structure wind wheel can ensure the concentration of wind and increase the blowing distance of the wind wheel.
  • the inner blade of the existing double-layer wind blade structure has a small inner blade, which has little effect on the overall airflow, so that the air blowing area of the wind wheel is too small to meet the user's demand.
  • the present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a wind wheel and a household appliance.
  • a wind wheel includes a first hub, a second hub, a plurality of first blades, and a plurality of second blades.
  • the first hub is disposed coaxially with the second hub.
  • the plurality of first vanes are fixedly coupled to the first hub and the second hub.
  • the plurality of first blades are spaced apart.
  • the plurality of second vanes are fixed to an outer side surface of the second hub.
  • the plurality of second blades are spaced apart.
  • the total area of the plurality of first blades is greater than the total area of the plurality of second blades.
  • the first blade since the total area of the first blade is larger than the total area of the second blade, the first blade has a large influence on the overall airflow of the wind wheel, so that the airflow of the first blade and the second blade can be diffused after being merged. Thereby increasing the blowing area of the wind wheel, meeting the needs of the user.
  • the angle of attack of the first blade is greater than the angle of attack of the second blade.
  • the plurality of first vanes are radially spaced about the first hub.
  • the plurality of second vanes are radially spaced about the first hub.
  • the first vanes are evenly distributed along the circumferential direction of the first hub.
  • the second vanes are evenly distributed along the circumferential direction of the second hub.
  • the first blade is an airfoil blade.
  • the second blade is an airfoil blade
  • the ratio of the total area of the plurality of first vanes to the sum of the areas of the gaps between the adjacent two of the first vanes is greater than one and less than three.
  • the ratio of the total area of the plurality of second vanes to the sum of the areas of the gaps between the adjacent two of the second vanes is greater than one and less than four.
  • a ratio of a total area of the plurality of first blades to an area of a gap between two adjacent first blades is smaller than a total area of the plurality of second blades The ratio of the sum of the areas of the gaps between two adjacent said second vanes.
  • the wind wheel is an integrally formed structure.
  • the home appliance of the embodiment of the present invention includes the above-described wind wheel.
  • the air blowing area of the household appliance in the process of use is larger, and the user's demand can be satisfied.
  • FIG. 1 is a schematic plan view of a wind wheel according to an embodiment of the present invention.
  • FIG. 2 is a schematic view showing the working principle of the wind wheel according to the embodiment of the present invention.
  • first and second are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include one or more of the described features either explicitly or implicitly.
  • the meaning of “plurality” is two or more, Unless otherwise specifically defined.
  • connection In the description of the present invention, it should be noted that the terms “installation”, “connected”, and “connected” are to be understood broadly, and may be fixed or detachable, for example, unless otherwise explicitly defined and defined. Connected, or integrally connected; may be mechanically connected, may be electrically connected or may communicate with each other; may be directly connected, or may be indirectly connected through an intermediate medium, may be internal communication of two elements or interaction of two elements relationship.
  • Connected, or integrally connected may be mechanically connected, may be electrically connected or may communicate with each other; may be directly connected, or may be indirectly connected through an intermediate medium, may be internal communication of two elements or interaction of two elements relationship.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • the first feature "on” or “under” the second feature may include direct contact of the first and second features, and may also include first and second features, unless otherwise specifically defined and defined. It is not in direct contact but through additional features between them.
  • the first feature “above”, “above” and “above” the second feature includes the first feature directly above and above the second feature, or merely indicating that the first feature level is higher than the second feature.
  • the first feature “below”, “below” and “below” the second feature includes the first feature directly above and above the second feature, or merely the first feature level being less than the second feature.
  • a wind wheel 100 includes a first hub 10 , a second hub 20 , a plurality of first blades 30 , and a plurality of second blades 40 .
  • the first hub 10 is disposed coaxially with the second hub 20.
  • the plurality of first vanes 30 are fixedly coupled to the first hub 10 and the second hub 20.
  • the plurality of first blades 30 are spaced apart.
  • a plurality of second vanes 40 are secured to the outer side 22 of the second hub 20.
  • the plurality of second vanes 40 are spaced apart.
  • the total area ⁇ S1 of the plurality of first blades 30 is greater than the total area ⁇ S2 of the plurality of second blades 40.
  • the first blades 30 of the wind wheel 100 since the total area of the first blades 30 of the wind wheel 100 is larger than the total area of the second blades 40, the first blades 30 have a greater influence on the overall airflow generated by the wind wheels 100, so that the first blades 30 After the airflow is merged with the second blade 40, the airflow can be diffused, thereby increasing the air blowing area of the wind wheel 100, and satisfying the needs of the user.
  • first blade 30 and the airflow generated by the second blade 40 merge and interact, which can reduce the eddy current generated by the centrifugal force of the wind wheel 100, and make the diffused wind closer to the natural wind, thereby improving the user experience.
  • the inventor will detect the wind wheel 100 according to an embodiment of the present invention and the existing wind wheel under the same conditions The number is compared, where the air volume and noise are compared when the speed is close to obtain Table 1:
  • first hub 10 is an inner hub and the second hub 20 is an outer hub.
  • the first blade 30 is an inner blade and the second blade 40 is an outer blade.
  • the first hub 10 is closer to the center of rotation of the wind wheel 100 than the second hub 20, and the first blade 30 is closer to the center of rotation of the wind wheel 100 than the second blade 40.
  • the inner end edges 32 of the plurality of first vanes 30 are coupled to the outer sidewall 12 of the first hub 10.
  • the outer end edges 34 of the plurality of first vanes 30 are coupled to the inner side 24 of the second hub 20.
  • the first hub 10 and the second hub 20 are directly connected by the first vane 30, which reduces the structural complexity of the wind wheel 100 and makes the wind wheel 100 easier to manufacture.
  • the plurality of first blades 30 are arranged at a radial interval around the first hub 10.
  • the first blade 30 it is advantageous for the first blade 30 to connect the first hub 10 and the second hub 20, and the strength of the wind wheel 100 can be improved.
  • the plurality of second blades 40 are arranged at a radial interval around the first hub 10.
  • This can increase the air inlet area of the wind wheel 100, and is advantageous for increasing the air volume of the wind wheel 100.
  • first vanes 30 are evenly distributed along the circumferential direction of the first hub 10.
  • the distance between any two adjacent first blades 30 in the circumferential direction is equal or arbitrary
  • the angle between the two adjacent first blades 30 is equal, which facilitates the manufacture of the wind wheel 100, and enables the first blade 30 to generate a uniform velocity airflow in the circumferential direction, ensuring the first blade 30 and the second blade. 40 can be diffused after the airflow is merged, thereby increasing the air blowing area of the wind wheel 100.
  • the second vanes 40 are evenly distributed along the circumferential direction of the second hub 20.
  • first vane 30 and the second vane 40 are evenly distributed along the circumferential direction of the wind wheel 100, and it is also ensured that the mass center of gravity of the wind wheel 100 is located at the center of rotation of the wind wheel 100 in the stationary state. This can reduce the vibration when the wind wheel 100 rotates, thereby reducing the noise generated by the rotation of the wind wheel 100.
  • the first hub 10 is provided with a central hole 14 through which the wind wheel 100 can be coupled to the rotating shaft of the motor, and the motor drives the wind wheel 100 to rotate.
  • the angle of attack of the first blade 30 is greater than the angle of attack of the second blade 40.
  • the wind wheel 100 has better aerodynamic performance, improves the efficiency of the wind wheel 100, and makes the wind wheel 100 of the present embodiment generate more air volume at the same rotational speed than the conventional wind wheel 100. Big.
  • the first blade 30 is an airfoil blade.
  • the aerodynamic performance of each of the first blades 30 can be improved, and the first blades 30 have a greater influence on the overall airflow of the wind wheel 100, so that the aerodynamic performance of the wind wheel 100 can be improved.
  • the power loss of the wind wheel 100 is reduced, and energy (such as electric energy) is saved.
  • the structures of the plurality of first blades 30 are all the same, that is, the overall structure of each of the first blades 30 is the same, which facilitates the manufacture of the wind wheel 100.
  • the first blade 30 is a twisted airfoil blade. Since the shape of the twisted blade coincides with the flow pattern of the airflow, the loss of the gas flow can be reduced, and the efficiency of the wind wheel 100 can be improved.
  • the second blade 40 is an airfoil blade. This can further improve the aerodynamic performance of the rotor 100.
  • the airfoil blade is designed, for example, with a wing of a bird as a bionic object.
  • the first blade 30 can be designed as a secondary feather shape
  • the second blade 40 can be designed as a primary feather shape, so that two layers of blades having different shapes can be designed, and the advantages are: 1
  • the shape of the blade adopts the bionic design, which makes the blade have good aerodynamic performance and the overall appearance after assembly; 2.
  • the double-layer blade design can increase the sweeping area and increase the air volume; 3.
  • the design of the double-layer blade for the middle and outer wheel hub improves The strength of the blade extends the working life.
  • the ratio of the sum ⁇ S1' of the total area ⁇ S1 of the plurality of first blades 30 to the gap between the adjacent two first blades 30 is greater than 1 and less than 3.
  • ⁇ S1/ ⁇ S1’ is greater than 1 and less than 3
  • the first blade 30 has better aerodynamic performance
  • the wind wheel 100 has a larger air volume and a larger air blowing area.
  • the ratio of the sum ⁇ S2' of the total area ⁇ S2 of the plurality of second blades 40 to the area of the gap between the adjacent two second blades 40 is larger than 1 and smaller than 4.
  • the ratio ⁇ S1/ ⁇ S1' of the sum ⁇ S1' of the total area ⁇ S1 of the plurality of first blades 30 and the gap between the adjacent two first blades 30 is smaller than the total of the plurality of second blades 40.
  • the first vanes 30 are distributed in the circumferential direction of the first hub 10 and are sparsely distributed in the circumferential direction of the second hub 20 than the second vanes 40. This can ensure that the amount of air entering the wind wheel 100 is sufficient to meet the demand for the large amount of wind of the wind wheel 100.
  • the number of the first blades 30 is seven, and the number of the second blades 40 is nine.
  • the specific number of first and second blades may be determined based on actual conditions.
  • the ratio of the sum of the total area of the plurality of first blades and the area of the gap between the adjacent two first blades is smaller than the total of the plurality of second blades. The ratio of the area to the sum of the areas of the gaps between two adjacent second blades.
  • the total area ⁇ S1 of the plurality of first blades 30, the area S1' of the gap between the adjacent two first blades 30, the total area ⁇ S2 of the plurality of second blades 40, and the adjacent two The area S2' of the gap between the second blades 40 is the area measured after the wind wheel 100 is forward projected, and the view of the forward projection of the wind wheel 100 is the view of the wind wheel 100 in FIG.
  • the area S1 of the gap between the adjacent two first blades 30 is the contour of the adjacent two first blades 30, the contour of the first hub 10, and the first line after the forward projection of the wind wheel 100 The area of the figure enclosed by the contour of the second hub 20.
  • the area of the pattern surrounded by the line segment L1, the line segment L2, the line segment L3, and the line segment L4 is the area S1' of the gap between the adjacent two first blades 30.
  • the total area ⁇ S1 of the plurality of first blades 30 is the sum of the areas S1 of the figures enclosed by the contour lines of each of the first blades 30 after the wind wheel 100 is projected forward.
  • the area S2 of the gap between the adjacent two second blades 40 is the contour of the two adjacent second blades 40 after the forward projection of the wind wheel 100, the contour of the second hub 20, and the second blade 40.
  • the area of the pattern enclosed by the extension of the outer edge contour shown by the dashed line in Figure 1).
  • the wind wheel 100 is an integrally formed structure.
  • the material of the wind wheel 100 may be all plastic, and the structure forming the wind wheel 100 is manufactured by an injection molding process.
  • the processing process of the wind wheel 100 can be simplified, the manufacturing cost of the wind wheel 100 can be reduced, and the strength of the first blade 30 and the second blade 40 can be improved, so that the first blade 30 and the second blade 40 are not easily damaged.
  • the home appliance of the embodiment of the present invention includes the above-described wind wheel 100.
  • the household appliance of the present embodiment applies the wind wheel 100 described above, the air blowing area of the household appliance during use is larger, and the user's demand can be satisfied.
  • the home appliance is, for example, a household appliance having a wind wheel such as a fan, a heater or an air conditioner.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

公开了一种风轮（100）及家用电器。风轮（100）包括第一轮毂（10）、第二轮毂（20）、多个第一叶片（30）及多个第二叶片（40）。第一轮毂（10）和第二轮毂（20）同轴设置。多个第一叶片（30）固定连接第一轮毂（10）与第二轮毂（20）。多个第一叶片（30）间隔排布。多个第二叶片（40）固定在第二轮毂（20）的外侧面。多个第二叶片（40）间隔排布。多个第一叶片（30）的总面积大于多个第二叶片（40）的总面积。该风轮的出风面积大，满足用户的需求。

Description

风轮及家用电器 技术领域
本发明涉及家用电器领域，尤其涉及一种风轮及一种家用电器。
背景技术
现有的双层风叶结构的风轮能够保证风力集中，增大了风轮的吹风距离。然而，现有的双层风叶结构的风轮的内层叶片较小，对整体气流的影响不大，使风轮的吹风面积过小，无法满足用户需求。
发明内容
本发明旨在至少解决现有技术中存在的技术问题之一。为此，本发明提供一种风轮及一种家用电器。
本发明实施方式的风轮包括第一轮毂、第二轮毂、多个第一叶片及多个第二叶片。所述第一轮毂与所述第二轮毂同轴设置。所述多个第一叶片固定连接所述第一轮毂与所述第二轮毂。所述多个第一叶片间隔排布。所述多个第二叶片固定在所述第二轮毂的外侧面。所述多个第二叶片间隔排布。所述多个第一叶片的总面积大于所述多个第二叶片的总面积。
上述风轮中，由于第一叶片的总面积大于第二叶片的总面积，第一叶片对风轮的整体气流产生较大的影响，使第一叶片与第二叶片产生气流汇合后能够扩散，从而增大了风轮的吹风面积，满足了用户的需求。
在某些实施方式中，所述第一叶片的迎角大于所述第二叶片的迎角。
在某些实施方式中，所述多个第一叶片以所述第一轮毂为中心呈放射状间隔排布。
在某些实施方式中，所述多个第二叶片以所述第一轮毂为中心呈放射状间隔排布。
在某些实施方式中，所述第一叶片沿所述第一轮毂的圆周方向均匀分布。
在某些实施方式中，所述第二叶片沿所述第二轮毂的圆周方向均匀分布。
在某些实施方式中，所述第一叶片为翼型叶片。
在某些实施方式中，所述第二叶片为翼型叶片
在某些实施方式中，所述多个第一叶片的总面积与相邻的两个所述第一叶片之间的间隙的面积之和的比值大于1且小于3。
在某些实施方式中，所述多个第二叶片的总面积与相邻的两个所述第二叶片之间的间隙的面积之和的比值大于1且小于4。
在某些实施方式中，所述多个第一叶片的总面积与相邻的两个所述第一叶片之间的间隙的面积之和的比值小于所述多个第二叶片的总面积与相邻的两个所述第二叶片之间的间隙的面积之和的比值。
在某些实施方式中，所述风轮为一体成型结构。
本发明实施方式的家用电器包括上述的风轮。
由于本实施方式的家用电器应用上述的风轮，使得家用电器在使用的过程中的吹风面积更大，可满足用户的需求。
本发明的附加方面和优点将在下面的描述中部分给出，部分将从下面的描述中变得明显，或通过本发明的实践了解到。
附图说明
本发明的上述和/或附加的方面和优点从结合下面附图对实施方式的描述中将变得明显和容易理解，其中：
图1是本发明实施方式的风轮的平面示意图。
图2是本发明实施方式的的风轮的工作原理示意图。
具体实施方式
下面详细描述本发明的实施方式，所述实施方式的示例在附图中示出，其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施方式是示例性的，仅用于解释本发明，而不能理解为对本发明的限制。
在本发明的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本发明的描述中，“多个”的含义是两个或两个以上， 除非另有明确具体的限定。
在本发明的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接或可以相互通讯；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接接触，也可以包括第一和第二特征不是直接接触而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度小于第二特征。
下文的公开提供了许多不同的实施方式或例子用来实现本发明的不同结构。为了简化本发明的公开，下文中对特定例子的部件和设置进行描述。当然，它们仅仅为示例，并且目的不在于限制本发明。此外，本发明可以在不同例子中重复参考数字和/或参考字母，这种重复是为了简化和清楚的目的，其本身不指示所讨论各种实施方式和/或设置之间的关系。此外，本发明提供了的各种特定的工艺和材料的例子，但是本领域普通技术人员可以意识到其他工艺的应用和/或其他材料的使用。
请参阅图1及图2，本发明实施方式的风轮100包括第一轮毂10、第二轮毂20、多个第一叶片30及多个第二叶片40。
第一轮毂10与第二轮毂20同轴设置。多个第一叶片30固定连接第一轮毂10与第二轮毂20。多个第一叶片30间隔排布。多个第二叶片40固定在第二轮毂20的外侧面22。多个第二叶片40间隔排布。多个第一叶片30的总面积ΣS1大于多个第二叶片40的总面积ΣS2。
上述风轮100中，由于风轮100的第一叶片30的总面积大于第二叶片40的总面积，第一叶片30对风轮100产生的整体气流产生较大的影响，使第一叶片30与第二叶片40产生气流汇合后能够扩散，从而增大了风轮100的吹风面积，满足了用户的需求。
另外，第一叶片30与第二叶片40产生的气流汇合相互作用，可降低风轮100离心力产生的涡流作用，使扩散后的风更加接近自然风，提高了用户体验。
发明人在同一条件下将检测到的根据本发明实施例的风轮100和现有的风轮的参 数进行比较，其中当转速接近时对风量和噪音进行比较得到表1：
Figure PCTCN2016105079-appb-000001
表1
当风量相同时对噪音进行比较得到表2：
Figure PCTCN2016105079-appb-000002
表2
由表1可以看出，当转速接近时，本实施方式的风轮100的风量明显大于现有的风轮的风量，但是噪音相差较小，对用户的影响不大。
由表2可以看出，当风量相同时，本实施方式的风轮100的噪音明显低于现有的风轮的噪音，转速和功率也明显低于现有的风轮，因此会节约电量。
需要说明的是，本实施方式中，可以理解为，第一轮毂10为内轮毂，第二轮毂20为外轮毂。第一叶片30为内叶片，第二叶片40为外叶片。
第一轮毂10较第二轮毂20靠近风轮100的转动中心，第一叶片30较第二叶片40靠近风轮100的转动中心。
具体地，多个第一叶片30的内端边缘32连接在第一轮毂10的外侧壁12上。多个第一叶片30的外端边缘34连接在第二轮毂20的内侧面24上。
第一轮毂10及第二轮毂20直接通过第一叶片30连接，降低了风轮100的结构复杂程度，使风轮100更加容易制造。
本实施方式中，多个第一叶片30以第一轮毂10为中心呈放射状间隔排布。
如此，有利于第一叶片30连接第一轮毂10及第二轮毂20，可提高风轮100的强度。
本实施方式中，多个第二叶片40以第一轮毂10为中心呈放射状间隔排布。
这样可增大风轮100的进风面积，有利于增大风轮100的出风量。
本实施方式中，第一叶片30沿第一轮毂10的圆周方向均匀分布。
也就是说，任意相邻的两个第一叶片30之间在圆周方向上的距离相等或者任意相 邻的两个第一叶片30之间的夹角相等，这样可方便风轮100的制造，还能够使第一叶片30在圆周方向上产生速度均匀的气流，保证第一叶片30及第二叶片40产生气流汇合后能够扩散，从而增大风轮100的吹风面积。
本实施方式中，第二叶片40沿第二轮毂20的圆周方向均匀分布。
如此，有利于风轮100的制造，并且使风轮100的产生的气流密度均匀，有利于气体流动。
另外，第一叶片30及第二叶片40沿风轮100的圆周方向均均匀分布，还能够保证风轮100在静止状态下，风轮100的质量重心位于风轮100的转动中心上。这样可以减少风轮100转动时的振动，从而减少风轮100转动产生的噪音。
具体地，第一轮毂10开设有中心孔14，风轮100可通过中心孔14与电机的转动轴连接，电机驱动风轮100转动。
本实施方式中，第一叶片30的迎角大于第二叶片40的迎角。
如此，风轮100具有较好的气动性能，提高了风轮100的效率，并使本实施方式的风轮100与传统的风轮相比，在相同的转速下，风轮100产生的风量更大。
本实施方式中，第一叶片30为翼型叶片。
由于翼型叶片具有较好的气动性能，这样可以提高每个第一叶片30气动性能，并且第一叶片30对风轮100的整体气流影响较大，这样可提高风轮100的气动性能，减小了风轮100的功率损耗，节约了能源(例如电能)。
具体地，多个第一叶片30的结构均相同，也就是说，每个第一叶片30的整体结构相同，这样可方便风轮100的制造。
进一步地，第一叶片30为扭曲的翼型叶片。由于扭曲的叶片的形状与气流的流动规律相符，这样可以减少气体流动的损失，提高风轮100的效率。
较佳地，第二叶片40为翼型叶片。这样可以进一步提高风轮100的气动性能。
另外，翼型叶片例如以飞鸟的羽翼为仿生对象进行设计。具体地，在一个例子中，第一叶片30可设计为次级飞羽状，第二叶片40可设计为初级飞羽状，这样便能设计出外形不同的两层叶片，其优点是：1.叶片的外形采用仿生设计，使叶片具有良好的气动性能，且装配后整体美观；2.双层叶片设计，可增加了扫风面积，提高风量；3.双层叶片的中外轮毂设计，提高了叶片的强度，延长工作寿命。
本实施方式中，多个第一叶片30的总面积ΣS1与相邻的两个第一叶片30之间的间隙的面积之和ΣS1’的比值大于1且小于3。
也就是说，1<ΣS1/ΣS1’<3。根据实验测试而得，ΣS1/ΣS1’在大于1且小于3这个范 围时，第一叶片30具有较好的气动性能，风轮100的风量较大，且吹风面积较大。
本实施方式中，多个第二叶片40的总面积ΣS2与相邻的两个第二叶片40之间的间隙的面积之和ΣS2’的比值大于1且小于4。
也就是说，1<ΣS2/ΣS2’<4。根据实验测试而得，ΣS2/ΣS2’在大于1且小于4这个范围时，可以进一步挺高风轮100的气动性能，使得风轮100的吹风量较大，且吹风面积更广。
本实施方式中，多个第一叶片30的总面积ΣS1与相邻的两个第一叶片30之间的间隙的面积之和ΣS1’的比值ΣS1/ΣS1’小于多个第二叶片40的总面积ΣS2与相邻的两个第二叶片40之间的间隙的面积之和ΣS2’的比值ΣS2/ΣS2’。
也就是说，ΣS1/ΣS1’<ΣS2/ΣS2’。由此可得，第一叶片30沿第一轮毂10的圆周方向分布较第二叶片40沿第二轮毂20的圆周方向分布稀疏。这样可以保证风轮100的进风量充足，满足风轮100的大风量的需求。
具体地，本实施方式中，第一叶片30的数量为7个，第二叶片40的数量为9个。
在其他实施方式中，第一叶片和第二叶片的具体数量可根据实际情况确定。在这样的其他实施方式中，较佳地，也可满足多个第一叶片的总面积与相邻的两个第一叶片之间的间隙的面积之和的比值小于多个第二叶片的总面积与相邻的两个第二叶片之间的间隙的面积之和的比值。
需要说明的是，多个第一叶片30的总面积ΣS1、相邻的两个第一叶片30之间的间隙的面积S1’、多个第二叶片40的总面积ΣS2及相邻的两个第二叶片40之间的间隙的面积S2’为风轮100进行正向投影后测得的面积，风轮100正向投影的视图如图1中风轮100的视图。
其中，相邻的两个第一叶片30之间的间隙的面积S1’为风轮100正向投影后，相邻的两个第一叶片30的轮廓线、第一轮毂10的轮廓线及第二轮毂20的轮廓线围成的图形的面积。
例如图1中，线段L1、线段L2、线段L3及线段L4所围成的图形的面积为相邻的两个第一叶片30之间的间隙的面积S1’。
多个第一叶片30的总面积ΣS1为风轮100正向投影后每个第一叶片30的轮廓线围成的图形的面积S1之和。
相邻的两个第二叶片40之间的间隙的面积S2’为风轮100正向投影后相邻的两个第二叶片40的轮廓线、第二轮毂20的轮廓线及第二叶片40的外边缘轮廓线的延长线(如图1中虚线所示)围成的图形的面积。
本实施方式中，较佳地，风轮100为一体成型结构。
具体地，风轮100的材料可均为塑料，进而通过注塑工艺制造形成风轮100的结构。
这样可使风轮100的加工工艺简单，降低了风轮100的制造成本，还可以提高第一叶片30及第二叶片40的强度，使第一叶片30及第二叶片40不易被损坏。
本发明实施方式的家用电器包括上述的风轮100。
由于本实施方式的家用电器应用上述的风轮100，使得家用电器在使用过程中的吹风面积更大，可满足用户的需求。
家用电器例如是风扇、取暖器或空调器等具有风轮的家用电器。
在本说明书的描述中，参考术语“一个实施方式”、“一些实施方式”、“示意性实施方式”、“示例”、“具体示例”、或“一些示例”等的描述意指结合所述实施方式或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施方式或示例中。在本说明书中，对上述术语的示意性表述不一定指的是相同的实施方式或示例。而且，描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施方式或示例中以合适的方式结合。
尽管已经示出和描述了本发明的实施方式，本领域的普通技术人员可以理解：在不脱离本发明的原理和宗旨的情况下可以对这些实施方式进行多种变化、修改、替换和变型，本发明的范围由权利要求及其等同物限定。

Claims (13)

  1. 一种风轮，其特征在于，包括：
    第一轮毂；
    与所述第一轮毂同轴设置的第二轮毂；
    固定连接所述第一轮毂与所述第二轮毂的多个第一叶片，所述多个第一叶片间隔排布；及
    固定在所述第二轮毂的外侧面的多个第二叶片，所述多个第二叶片间隔排布；
    所述多个第一叶片的总面积大于所述多个第二叶片的总面积。
  2. 如权利要求1所述的风轮，其特征在于，所述第一叶片的迎角大于所述第二叶片的迎角。
  3. 如权利要求1或2所述的风轮，其特征在于，所述多个第一叶片以所述第一轮毂为中心呈放射状间隔排布。
  4. 如权利要求1-3中任一项所述的风轮，其特征在于，所述多个第二叶片以所述第一轮毂为中心呈放射状间隔排布。
  5. 如权利要求1或2所述的风轮，其特征在于，所述第一叶片沿所述第一轮毂的圆周方向均匀分布。
  6. 如权利要求1或2所述的风轮，其特征在于，所述第二叶片沿所述第二轮毂的圆周方向均匀分布。
  7. 如权利要求1-6中任一项所述的风轮，其特征在于，所述第一叶片为翼型叶片。
  8. 如权利要求1-7中任一项所述的风轮，其特征在于，所述第二叶片为翼型叶片。
  9. 如权利要求1-8中任一项所述的风轮，其特征在于，所述多个第一叶片的总面积与相邻的两个所述第一叶片之间的间隙的面积之和的比值大于1且小于3。
  10. 如权利要求1-9中任一项所述的风轮，其特征在于，所述多个第二叶片的总面 积与相邻的两个所述第二叶片之间的间隙的面积之和的比值大于1且小于4。
  11. 如权利要求1-10中任一项所述的风轮，其特征在于，所述多个第一叶片的总面积与相邻的两个所述第一叶片之间的间隙的面积之和的比值小于所述多个第二叶片的总面积与相邻的两个所述第二叶片之间的间隙的面积之和的比值。
  12. 如权利要求1-11中任一项所述的风轮，其特征在于，所述风轮为一体成型结构。
  13. 一种家用电器，其特征在于，包括如权利要求1～12任一项所述的风轮。
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