WO2019136939A1 - Axial fan blade, axial fan blade assembly, and axial fan duct assembly - Google Patents

Axial fan blade, axial fan blade assembly, and axial fan duct assembly Download PDF

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Publication number
WO2019136939A1
WO2019136939A1 PCT/CN2018/093266 CN2018093266W WO2019136939A1 WO 2019136939 A1 WO2019136939 A1 WO 2019136939A1 CN 2018093266 W CN2018093266 W CN 2018093266W WO 2019136939 A1 WO2019136939 A1 WO 2019136939A1
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WIPO (PCT)
Prior art keywords
fan blade
axial
axial fan
assembly
axial flow
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PCT/CN2018/093266
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French (fr)
Chinese (zh)
Inventor
贾新涛
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
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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 EP18900229.8A priority Critical patent/EP3739218A4/en
Publication of WO2019136939A1 publication Critical patent/WO2019136939A1/en

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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
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • 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
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence

Definitions

  • the invention relates to an axial fan blade, an axial fan blade assembly and an axial fan duct assembly.
  • dB(A) refers to the A-weighted sound level, which is the frequency characteristic of the simulated human ear to low-intensity noise below 55dB.
  • the present invention aims to solve at least one of the technical problems existing in the prior art or related art.
  • One of the objectives of the present invention is to provide an axial flow fan blade, an axial flow fan blade assembly, and an axial flow fan air passage assembly, which solves the problem that the existing wind speed, air volume and noise are not balanced, resulting in a customer experience. Poor question.
  • the present invention provides an axial flow fan blade having a flow guiding section formed on an end of the windward edge near the tip of the blade, and a plurality of flow guiding grooves are formed on the guiding section; the guiding flow
  • the distance between the closest point of the segment and the center of rotation of the axial fan blade is r 1
  • the distance between the farthest point of the flow guiding segment and the center of rotation of the axial fan blade is r 2
  • the depth of the guide groove is gradually reduced.
  • the flow guiding section is in a zigzag shape.
  • the present invention also provides an axial fan blade assembly comprising the above-described axial fan blade and a hub for mounting the axial fan blade.
  • the number of axial fan blades is an odd number.
  • the number of the axial fan blades is three or five.
  • the axial flow fan and the mounting surface of the hub intersect the first curve, and an angle between a tangent to the arbitrary point on the first curve and a vertical plane of the hub is 30 ⁇ 5°.
  • the radius of the hub is r 3
  • the distance between the farthest point on the blade and the center of rotation of the axial fan blade is r 4
  • r 3 : r 4 is 0.2-0.3 .
  • the present invention also provides an axial flow fan duct assembly, comprising the above-described axial flow fan blade assembly, and further comprising an air guide tube, wherein the axial flow fan blade of the axial flow fan blade assembly is located in the air guide tube.
  • the air duct gradually decreases in cross-sectional area along the wind direction.
  • the axial flow fan duct assembly further includes an air outlet hood, and an end of the air duct is fixed on the air outlet hood.
  • the axial flow fan blade of the present invention can guide the airflow into a small airflow at the source formed by the airflow, so that the guide groove on the windward edge can achieve the best noise reduction. effect.
  • the depth of the flow guiding groove gradually decreases toward the center of rotation, that is, the depth is smaller as the distance from the airflow source guiding groove, so that the wind speed can be ensured to be uniform, and the wind experienced by the user is more natural.
  • the axial fan blade of the present invention can reduce the noise without sacrificing wind speed and air volume, and can give the user a good comprehensive experience.
  • FIG. 1 is a schematic structural view of an axial flow fan blade assembly of an embodiment
  • FIG. 2 is a schematic structural view of an axial flow fan duct assembly of an embodiment
  • Figure 3 is a schematic view showing the installation of the grid strip in the embodiment
  • connection and “connected” are to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral, unless otherwise explicitly defined and defined.
  • Ground connection it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium.
  • the specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.
  • the axial flow fan blade 1 of the present embodiment has a flow guiding section formed on one end of the windward edge near the tip of the blade, and a plurality of guiding grooves 2 are defined in the guiding section; the guiding flow is The distance between the closest point of the segment and the center of rotation of the axial fan blade 1 is r 1 , and the distance between the farthest point of the flow guiding segment and the center of rotation of the axial fan blade 1 is r 2 The distance between the farthest point on the windward edge and the center of rotation of the axial fan blade 1 is r, and the ratio of (r 2 -r 1 ) to r is between one third and one half between. And the depth of the flow guiding groove 2 gradually decreases toward the center of rotation.
  • the above nearest point and farthest point are relative to the center of rotation O.
  • the tip refers to the portion of the axial fan blade 1 that is away from the center of rotation O
  • the blade root is the portion of the axial fan blade 1 that is close to the center of rotation O.
  • the flow guiding section can divide the airflow into a small airflow at the source formed by the airflow, so that the guiding groove 2 on the windward edge achieves the best noise reduction effect.
  • the depth of the flow guiding groove 2 gradually decreases toward the center of rotation, that is, the depth is smaller as it is farther away from the airflow source guiding groove 2, so that the wind speed can be ensured to be uniform, and the wind experienced by the user is more natural. Therefore, the axial fan blade 1 of the present embodiment can reduce the noise without sacrificing the wind speed and the air volume, and can give the user a good comprehensive experience.
  • Fig. 1 there is still some distance between the farthest point of the diversion section and the tip of the blade, and the distance can be adjusted within a certain interval, thereby facilitating the processing of the diversion section on the basis of ensuring the cutting airflow.
  • the farthest point of the diversion section can also be designed with the tip of the tip.
  • the flow guiding section is only disposed at one end of the axial fan blade 1 near the tip of the blade, which can not only achieve almost the same reduction effect when forming the guiding section on the entire windward edge, but also can prevent the guiding section from being formed at one end of the blade root.
  • the problem that the axial fan blade 1 is reduced in strength. Once the strength of the axial fan blade 1 is lowered, not only will the service life of the axial fan blade 1 be shortened, but even the vibration of the axial fan blade 1 will increase the noise of the axial fan blade 1 even when used.
  • the guide groove 2 on the guide groove 2 gradually decreases toward the center of rotation, so that it can be processed on the current axial fan blade 1 to obtain the above guide section, and It does not have any influence on the strength of the axial fan blade 1, so that it does not require an additional separate design of the axial fan blade 1.
  • the resistance of the air to the axial fan blade 1 can also be reduced, thereby effectively reducing the motor load, thereby increasing the wind speed at the same power.
  • the flow guiding section has a regular zigzag shape, which is not only convenient for processing, but also has a decorative effect when distributed on the tip of the axial fan blade 1.
  • the flow guiding sections are in a regular zigzag shape, it is further possible to set all the flow guiding grooves 2 to be equal in width.
  • the flow guiding section can be in any other shape besides being in a zigzag shape, as long as it can split the airflow.
  • the present embodiment provides an axial flow fan blade assembly including the above-described axial fan blade 1 and a hub 3 for mounting the axial flow fan blade 1.
  • the number of the axial fan blades 1 is an odd number to reduce the noise generated by the resonance of the axial fan blades 1. Also, it is preferred, but not necessary, that the number of axial fans 1 is three or five, thereby facilitating the performance of the axial fan blade assembly.
  • the axial flow fan blade 1 and the mounting surface of the hub 3 intersect the first curve, and the angle between the tangent to any point on the first curve and the vertical surface of the hub 3 is 30 ⁇ 5 °, the axial fan blade assembly can get more air volume while working, get higher motor performance, and get lower noise under the same conditions.
  • the mounting surface of the hub 3 is also the cylindrical surface on the hub 3 for mounting the axial fan blade 1.
  • the vertical face of the hub 3 is also the plane perpendicular to the central axis of the hub 3.
  • the points on the axial fan blade 1 that are equal to the central axis of the hub 3 are connected to equidistant lines, and the equidistant lines are projected along the radial direction of the hub 3 on the mounting surface of the hub 3 to obtain a projection line. Then, when the maximum value of the angle between the tangent of any point on the projection line and the vertical plane of the hub 3 is 42 ⁇ 5°, the performance of the axial fan blade assembly can be further improved, so that the axial fan fan The leaf assembly is operated with high wind speed, high air volume and low noise.
  • the axial flow blade 1 has a curvature distribution value of 0 to 0.176 so that the axial flow fan blade 1 obtains optimum performance.
  • the radius of the hub 3 is r 3
  • the distance between the farthest point on the blade and the center of rotation of the axial fan blade 1 is r 4
  • the embodiment provides a size of the axial fan blade assembly: the axial fan blade 1 has a thickness of 2.0 mm, r 4 is 185 mm, and r 3 is 42 mm.
  • the wind speed can reach 0.5m/s at a distance of two meters from the outlet when the noise is less than 50dB(A).
  • the embodiment provides an axial flow fan duct assembly including the above-described axial fan blade assembly, and further includes an air duct 4.
  • the air duct 4 is disposed between the air inlet and the air outlet of the axial fan duct assembly.
  • the axial fan blade 1 of the axial fan blade assembly is disposed in the air duct 4, thereby reducing air turbulence and ensuring a more uniform and comfortable wind at the air outlet.
  • the axial flow fan duct assembly further includes an air outlet hood 5, and an end of the air duct 4 is fixed to the air outlet hood 5.
  • the upper air duct 4 is disposed on the air outlet hood 5, thereby protecting the axial fan blade 1 and preventing the axial fan blade 1 from being Bruises.
  • the air duct 4 and the air outlet hood 5 are integrally formed, so that the assembly difficulty of the entire axial flow fan duct assembly can be reduced.
  • the air duct 4 gradually decreases in cross-sectional area along the air exit direction, so that the airflow is accelerated in the air duct 4, and a large wind speed is obtained at the air outlet hood 5 to meet user requirements. .
  • the grille 7 of the air outlet hood includes a plurality of grid bars, and all the grid bars are distributed along the circumference.
  • FIG. 3 does not constitute a limitation on the air outlet hood of the present application.
  • the grid strips of the air outlet hood in the present application may also be disposed at the same time.
  • the outer section of the grid in the direction away from the center of the circumference, is gradually inclined toward the direction of rotation of the blade, and the arrow in Fig. 3 indicates the direction of rotation of the blade.
  • the "outer segment of the grid” refers to a segment of the grid that is away from the center of the circumference. The grid is arranged to ensure that the airflow generated at the fan blades is more easily passed, and the wind resistance is reduced, thereby obtaining a larger wind speed and air volume at the air outlet hood.
  • the entire grid can be designed such that the grid is gradually inclined toward the direction of rotation of the blade in a direction away from the center of the circumference.
  • the air duct is projected on the grille 7 along its own axial direction to obtain a first projection line 8, see FIG.
  • the first projection line 8 intersects the grid bar at a first point, and the angle between the tangent line of the grid strip at the first point and the tangent line 2 of the first projection line 8 at the point is 100°-115°.
  • the resistance of the grille 7 to the airflow can be further reduced to obtain a larger wind speed and air volume.
  • the cross section of the air outlet hood 5 gradually increases along the air flow direction, so that the air flow area between the adjacent grids 7 is gradually reduced along the air flow direction.
  • the airflow passes through the grille 7 to form an accelerating pressure on the grille 7, and a large wind speed is formed at the air outlet, thereby enabling the user to obtain a better experience.
  • the grid strip is streamlined along the direction of the wind. And the number of bars is an odd number to reduce the noise generated by the resonance.
  • the ratio of the air inlet surface area of the inlet air hood 6 to the air outlet surface area of the air outlet hood 5 is 1.1-1.35. In this case, a large wind speed can be obtained on the wind surface while ensuring the aesthetic appearance of the product.
  • the ratio of the air inlet surface area of the air inlet hood 6 to the air surface area of the air outlet hood 5 in this embodiment is 1.25, the user can obtain the best experience from the viewpoint of performance and appearance.
  • the inlet air hood 6 includes a first air inlet surface 601, a second air inlet surface 602, and a third air inlet surface 603 which are angled with each other. Therefore, the air inlet surface area of the intake air hood 6 is the sum of the areas of the first air inlet surface 601, the second air inlet surface 602, and the third air inlet surface 603. In the case that the other structures of the axial flow fan duct assembly are unchanged, the air inlet area of the air inlet hood 6 can be increased by providing a plurality of air inlet surfaces that are mutually angled, thereby ensuring the aesthetic performance of the product. The ratio of the area of the inlet surface of the inlet hood 6 to the area of the outlet surface of the outlet hood 5 is increased.
  • the number of air inlet surfaces on the air inlet hood 6 is not limited by the drawings.
  • the air inlet surface may be any other number, or may be one.
  • the angle between the plurality of air inlet faces is also not limited by the drawings.
  • any of the above-mentioned axial flow fans, axial fan blades and axial fan duct assemblies can be used in any field where axial fans are required.
  • the above-mentioned axial fan blade 1, axial fan blade assembly and axial fan duct assembly can be applied to products such as heaters, chillers, and ordinary fans.

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

Abstract

An axial fan blade, an axial fan blade assembly, and an axial fan duct assembly. A flow guide section is formed on the end on the wind-facing edge of an axial fan blade (1) close to the blade tip; multiple flow guide grooves (2) are provided on the flow guide section; the flow guide section meets the condition that (r 2-r 1):r=1/3-1/2, and the depths of the flow guide grooves (2) are gradually decreased towards the rotating center. According to the axial fan blade, the flow guide section can divide an airflow into small airflows, thereby achieving a noise reduction effect, and the depths of the flow guide grooves are gradually decreased, thereby ensuring uniform wind speed.

Description

轴流扇叶、轴流风机扇叶组件、轴流风机风道组件Axial fan blade, axial fan blade assembly, axial fan duct assembly
交叉引用cross reference
本申请引用于2018年01月13日提交的专利名称为“轴流扇叶、轴流风机扇叶组件、轴流风机风道组件”的第2018200542047号中国专利申请，其通过引用被全部并入本申请。This application is hereby incorporated by reference in its entirety in its entirety in its entirety in the entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire entire This application.
技术领域Technical field
本发明涉及轴流扇叶、轴流风机扇叶组件、轴流风机风道组件。The invention relates to an axial fan blade, an axial fan blade assembly and an axial fan duct assembly.
背景技术Background technique
目前采用轴流风机的产品，例如暖风机和冷风扇上均采用异形的扇叶实现大风量小噪音，但是效果都不好，无法达到风量和噪音的平衡。尤其是暖风机产品，在噪音要求小于50dB(A)的条件下往往牺牲整机风量和风速来达成要求，造成整个暖风行业风速和风量都很微弱，热风在一米外基本感受不到，客户体验很差。其中，dB(A)指的是A计权声级，是模拟人耳对55dB以下低强度噪声的频率特性。At present, products using axial flow fans, such as heaters and cooling fans, use shaped blades to achieve large wind and small noise, but the effect is not good enough to achieve a balance between air volume and noise. Especially for the heater products, under the condition that the noise requirement is less than 50dB(A), the wind volume and wind speed of the whole machine are often sacrificed to achieve the requirements, resulting in the wind speed and air volume of the whole warm air industry are very weak, and the hot air is basically not felt at one meter. The customer experience is very poor. Among them, dB(A) refers to the A-weighted sound level, which is the frequency characteristic of the simulated human ear to low-intensity noise below 55dB.
发明内容Summary of the invention
本发明旨在至少解决现有技术或相关技术中存在的技术问题之一。The present invention aims to solve at least one of the technical problems existing in the prior art or related art.
本发明的其中一个目的是：提供一种轴流扇叶、轴流风机扇叶组件、轴流风机风道组件，解决现有技术中存在的风速、风量与噪音之间无法平衡造成客户体验很差的问题。One of the objectives of the present invention is to provide an axial flow fan blade, an axial flow fan blade assembly, and an axial flow fan air passage assembly, which solves the problem that the existing wind speed, air volume and noise are not balanced, resulting in a customer experience. Poor question.
为了实现该目的，本发明提供了一种轴流扇叶，其迎风缘上靠近叶尖的一端上形成有导流段，所述导流段上开设有多个导流槽；所述导流段的最近点与所述轴流扇叶的旋转中心之间的距离为r 1，所述导流段的最远点与所述轴流扇叶的旋转中心之间的距离为r 2，所述迎风缘上最远点与所述轴流扇叶的旋转中心之间的距离为r，且(r 2－r 1)：r＝1/3-1/2，且朝着旋转中心所述导流槽的深度逐渐减小。 In order to achieve the object, the present invention provides an axial flow fan blade having a flow guiding section formed on an end of the windward edge near the tip of the blade, and a plurality of flow guiding grooves are formed on the guiding section; the guiding flow The distance between the closest point of the segment and the center of rotation of the axial fan blade is r 1 , and the distance between the farthest point of the flow guiding segment and the center of rotation of the axial fan blade is r 2 . The distance between the farthest point on the windward edge and the center of rotation of the axial fan blade is r, and (r 2 -r 1 ): r=1/3-1/2, and the direction toward the center of rotation The depth of the guide groove is gradually reduced.
可选地，所述导流段呈锯齿状。Optionally, the flow guiding section is in a zigzag shape.
本发明还提供一种轴流风机扇叶组件，包括上述轴流扇叶，以及用于安装所述轴流扇叶的轮毂。The present invention also provides an axial fan blade assembly comprising the above-described axial fan blade and a hub for mounting the axial fan blade.
可选地，所述轴流扇叶的数量为奇数。Optionally, the number of axial fan blades is an odd number.
可选地，所述轴流扇叶的数量为三片或者五片。Optionally, the number of the axial fan blades is three or five.
可选地，所述轴流扇叶与轮毂的安装面相交于第一曲线，所述第一曲线上任意点的切线与所述轮毂的垂直面之间的夹角为30±5°。Optionally, the axial flow fan and the mounting surface of the hub intersect the first curve, and an angle between a tangent to the arbitrary point on the first curve and a vertical plane of the hub is 30±5°.
可选地，所述轮毂的半径为r 3，所述扇叶上的最远点与所述轴流扇叶的旋转中心之间的距离为r 4，且r 3：r 4为0.2-0.3。 Optionally, the radius of the hub is r 3 , the distance between the farthest point on the blade and the center of rotation of the axial fan blade is r 4 , and r 3 : r 4 is 0.2-0.3 .
本发明还提供一种轴流风机风道组件，包括上述轴流风机扇叶组件，还包括导风管，所述轴流风机扇叶组件的轴流扇叶位于所述导风管内。The present invention also provides an axial flow fan duct assembly, comprising the above-described axial flow fan blade assembly, and further comprising an air guide tube, wherein the axial flow fan blade of the axial flow fan blade assembly is located in the air guide tube.
可选地，所述导风管沿着出风方向上横截面积逐渐减小。Optionally, the air duct gradually decreases in cross-sectional area along the wind direction.
可选地，所述轴流风机风道组件还包括出风导风罩，所述导风管的端部固定在所述出风导风罩上。Optionally, the axial flow fan duct assembly further includes an air outlet hood, and an end of the air duct is fixed on the air outlet hood.
本发明的技术方案具有以下优点：本发明的轴流扇叶，其导流段可以在气流形成的源头将气流分割成小的气流，从而使得迎风缘上的导流槽达到最好的降噪效果。并且，朝着旋转中心所述导流槽的深度逐渐减小，也即越远离气流源头导流槽深度越小，从而能够保证风速均匀，使得用户体验到的风更加自然。由此，本发明的轴流扇叶，其无需牺牲风速和风量来降低噪音，能给用户很好的综合体验。The technical solution of the present invention has the following advantages: the axial flow fan blade of the present invention can guide the airflow into a small airflow at the source formed by the airflow, so that the guide groove on the windward edge can achieve the best noise reduction. effect. Moreover, the depth of the flow guiding groove gradually decreases toward the center of rotation, that is, the depth is smaller as the distance from the airflow source guiding groove, so that the wind speed can be ensured to be uniform, and the wind experienced by the user is more natural. Thus, the axial fan blade of the present invention can reduce the noise without sacrificing wind speed and air volume, and can give the user a good comprehensive experience.
附图说明DRAWINGS
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any creative work.
图1是实施例的轴流风机扇叶组件的结构示意图；1 is a schematic structural view of an axial flow fan blade assembly of an embodiment;
图2是实施例的轴流风机风道组件的结构示意图；2 is a schematic structural view of an axial flow fan duct assembly of an embodiment;
图3是实施例中栅条的安装示意图；Figure 3 is a schematic view showing the installation of the grid strip in the embodiment;
图中：1、轴流扇叶；2、导流槽；3、轮毂；4、导风管；5、出风导风罩；6、进风导风罩；601、第一进风面；602、第二进风面；603、第三 进风面。In the figure: 1, axial fan blade; 2, diversion trough; 3, hub; 4, air duct; 5, air duct; 6, air duct; 601, first air inlet; 602, the second air inlet surface; 603, the third air inlet surface.
具体实施方式Detailed ways
为了能够更清楚地理解本发明的上述目的、特征和优点，下面结合附图和具体实施方式对本发明进行进一步的详细描述。需要说明的是，在不冲突的情况下，本申请的实施例及实施例中的特征可以相互组合。The present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.
在本发明的描述中，需要说明的是，术语“中心”、“纵向”、“横向”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”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”、“第三”仅用于描述目的，而不能理解为指示或暗示相对重要性。In the description of the present invention, it is to be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", " The orientation or positional relationship of the indications of "upright", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, only for the convenience of describing the present invention and The simplification of the description is not intended to limit or imply that the device or component that is referred to has a particular orientation, is constructed and operated in a particular orientation, and thus is not to be construed as limiting. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
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“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；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本发明中的具体含义。In the description of the present invention, it should be noted that the terms "connected" and "connected" are to be understood broadly, and may be, for example, a fixed connection, a detachable connection, or an integral, unless otherwise explicitly defined and defined. Ground connection; it can be mechanical connection or electrical connection; it can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present invention can be understood in a specific case by those skilled in the art.
请参见图1，本实施例的轴流扇叶1，其迎风缘上靠近叶尖的一端上形成有导流段，所述导流段上开设有多个导流槽2；所述导流段的最近点与所述轴流扇叶1的旋转中心之间的距离为r 1，所述导流段的最远点与所述轴流扇叶1的旋转中心之间的距离为r 2，所述迎风缘上最远点与所述轴流扇叶1的旋转中心之间的距离为r，且(r 2－r 1)与r的比值在三分之一到二分之一之间。且朝着旋转中心所述导流槽2的深度逐渐减小。 Referring to FIG. 1 , the axial flow fan blade 1 of the present embodiment has a flow guiding section formed on one end of the windward edge near the tip of the blade, and a plurality of guiding grooves 2 are defined in the guiding section; the guiding flow is The distance between the closest point of the segment and the center of rotation of the axial fan blade 1 is r 1 , and the distance between the farthest point of the flow guiding segment and the center of rotation of the axial fan blade 1 is r 2 The distance between the farthest point on the windward edge and the center of rotation of the axial fan blade 1 is r, and the ratio of (r 2 -r 1 ) to r is between one third and one half between. And the depth of the flow guiding groove 2 gradually decreases toward the center of rotation.
以上最近点和最远点都是相对旋转中心O而言的。并且，叶尖指的是轴流扇叶1上远离旋转中心O的部分，而叶根则是轴流扇叶1上靠近旋转中心O的部分。The above nearest point and farthest point are relative to the center of rotation O. Also, the tip refers to the portion of the axial fan blade 1 that is away from the center of rotation O, and the blade root is the portion of the axial fan blade 1 that is close to the center of rotation O.
本实施例的轴流扇叶1，其导流段可以在气流形成的源头将气流分割成小的气流，从而使得迎风缘上的导流槽2达到最好的降噪效果。并且，朝着旋转中心所述导流槽2的深度逐渐减小，也即越远离气流源头导流槽2深度越小，从而能够保证风速均匀，使得用户体验到的风更加自然。由 此，本实施例的轴流扇叶1，其无需牺牲风速和风量来降低噪音，能给用户很好的综合体验。In the axial fan blade 1 of the embodiment, the flow guiding section can divide the airflow into a small airflow at the source formed by the airflow, so that the guiding groove 2 on the windward edge achieves the best noise reduction effect. Moreover, the depth of the flow guiding groove 2 gradually decreases toward the center of rotation, that is, the depth is smaller as it is farther away from the airflow source guiding groove 2, so that the wind speed can be ensured to be uniform, and the wind experienced by the user is more natural. Therefore, the axial fan blade 1 of the present embodiment can reduce the noise without sacrificing the wind speed and the air volume, and can give the user a good comprehensive experience.
图1中导流段的最远点与叶尖之间还存在一些距离，该距离可以在一定区间内调整，从而在保证切割气流的基础上，便于导流段的加工。当然，导流段的最远点也可以顶着叶尖设计。In Fig. 1, there is still some distance between the farthest point of the diversion section and the tip of the blade, and the distance can be adjusted within a certain interval, thereby facilitating the processing of the diversion section on the basis of ensuring the cutting airflow. Of course, the farthest point of the diversion section can also be designed with the tip of the tip.
通过实验比对发现，在位于所述轴流扇叶1靠近叶尖的一端形成有导流段，且导流段满足(r 2－r 1)：r＝1/3-1/2的时候，其降噪效果和在整个轴流扇叶1的迎风缘上形成有导流段的降噪效果几乎差不大。 Through experimental comparison, it is found that a diversion section is formed at one end of the axial fan blade 1 near the tip of the blade, and the diversion section satisfies (r 2 -r 1 ): r=1/3-1/2 The noise reduction effect and the noise reduction effect of forming the diversion section on the windward edge of the entire axial fan blade 1 are almost no significant.
并且，导流段仅仅设置在轴流扇叶1靠近叶尖的一端，不仅能够达到在整个迎风缘上形成导流段时几乎一样的降低效果，还能够避免导流段形成在叶根一端时轴流扇叶1强度降低的问题。一旦轴流扇叶1强度降低，不仅将导致轴流扇叶1的使用寿命缩短，甚至在使用的时候因为轴流扇叶1的颤动还会升高轴流扇叶1的噪音。Moreover, the flow guiding section is only disposed at one end of the axial fan blade 1 near the tip of the blade, which can not only achieve almost the same reduction effect when forming the guiding section on the entire windward edge, but also can prevent the guiding section from being formed at one end of the blade root. The problem that the axial fan blade 1 is reduced in strength. Once the strength of the axial fan blade 1 is lowered, not only will the service life of the axial fan blade 1 be shortened, but even the vibration of the axial fan blade 1 will increase the noise of the axial fan blade 1 even when used.
值得一提的是，本实施例导流段，其上的导流槽2朝着旋转中心深度逐渐减小，因此可以在当前的轴流扇叶1上进行加工以得到以上导流段，并且不会对轴流扇叶1的强度造成任何影响，从而其无需额外单独设计轴流扇叶1。It is worth mentioning that, in the guide section of the embodiment, the guide groove 2 on the guide groove 2 gradually decreases toward the center of rotation, so that it can be processed on the current axial fan blade 1 to obtain the above guide section, and It does not have any influence on the strength of the axial fan blade 1, so that it does not require an additional separate design of the axial fan blade 1.
并且，在轴流扇叶1靠近叶尖的一端设置导流段的时候，还可以降低空气对轴流扇叶1的阻力，进而有效降低电机负载，从而在相同功率下提高风速。Moreover, when the flow guiding section is provided at the end of the axial fan blade 1 near the tip end, the resistance of the air to the axial fan blade 1 can also be reduced, thereby effectively reducing the motor load, thereby increasing the wind speed at the same power.
本实施例中，优选导流段呈规则的锯齿状，其不仅便于加工，并且分布在轴流扇叶1叶尖的时候还能起到装饰效果。当导流段呈规则的锯齿状的时候，进一步可以设置成所有导流槽2等宽。当然，导流段除了呈锯齿状之外，还可以呈任何其它的形状，只要能到对气流起到分割效果即可。In this embodiment, it is preferable that the flow guiding section has a regular zigzag shape, which is not only convenient for processing, but also has a decorative effect when distributed on the tip of the axial fan blade 1. When the flow guiding sections are in a regular zigzag shape, it is further possible to set all the flow guiding grooves 2 to be equal in width. Of course, the flow guiding section can be in any other shape besides being in a zigzag shape, as long as it can split the airflow.
进一步的，本实施例提供一种轴流风机扇叶组件，包括上述轴流扇叶1，以及用于安装所述轴流扇叶1的轮毂3。Further, the present embodiment provides an axial flow fan blade assembly including the above-described axial fan blade 1 and a hub 3 for mounting the axial flow fan blade 1.
本实施例中，优选所述轴流扇叶1的数量为奇数，以降低轴流扇叶1共振产生的噪音。并且，优选但是不必须轴流扇叶1的数量为三片或者五片，从而便于保证轴流风机扇叶组件的性能。In the present embodiment, it is preferable that the number of the axial fan blades 1 is an odd number to reduce the noise generated by the resonance of the axial fan blades 1. Also, it is preferred, but not necessary, that the number of axial fans 1 is three or five, thereby facilitating the performance of the axial fan blade assembly.
其中，假设所述轴流扇叶1与轮毂3的安装面相交于第一曲线，当所 述第一曲线上任意点的切线与所述轮毂3的垂直面之间的夹角为30±5°，轴流风机扇叶组件工作的时候能获取更大的风量，同时获取更高的电机效能，并在同等工况下获得更低的噪音。Wherein, it is assumed that the axial flow fan blade 1 and the mounting surface of the hub 3 intersect the first curve, and the angle between the tangent to any point on the first curve and the vertical surface of the hub 3 is 30±5 °, the axial fan blade assembly can get more air volume while working, get higher motor performance, and get lower noise under the same conditions.
其中，轮毂3的安装面也即轮毂3上用于安装轴流扇叶1的圆柱面。轮毂3的垂直面也即垂直于轮毂3中心轴线的平面。The mounting surface of the hub 3 is also the cylindrical surface on the hub 3 for mounting the axial fan blade 1. The vertical face of the hub 3 is also the plane perpendicular to the central axis of the hub 3.
进一步的，将轴流扇叶1上距离轮毂3的中心轴线相等的点连成等距线，那么将等距线沿着轮毂3的径向投影在轮毂3的安装面上，得到投影线，那么该投影线上任意点的切线与所述轮毂3的垂直面之间的夹角的最大值为42±5°的时候，可以进一步提高轴流风机扇叶组件的性能，使得轴流风机扇叶组件工作时候获取高风速、大风量和低噪音。Further, the points on the axial fan blade 1 that are equal to the central axis of the hub 3 are connected to equidistant lines, and the equidistant lines are projected along the radial direction of the hub 3 on the mounting surface of the hub 3 to obtain a projection line. Then, when the maximum value of the angle between the tangent of any point on the projection line and the vertical plane of the hub 3 is 42±5°, the performance of the axial fan blade assembly can be further improved, so that the axial fan fan The leaf assembly is operated with high wind speed, high air volume and low noise.
其中，优选但是不必须轴流扇叶1的曲率分布值为0-0.176，以使得轴流扇叶1获得最佳的性能。Among them, it is preferable, but not necessary, that the axial flow blade 1 has a curvature distribution value of 0 to 0.176 so that the axial flow fan blade 1 obtains optimum performance.
此外，本实施例中，所述轮毂3的半径为r 3，所述扇叶上的最远点与所述轴流扇叶1的旋转中心之间的距离为r 4，且r 3：r 4为0.2到0.3之间的时候，可以在保证轮毂3和轴流扇叶1的安装强度的前提下，获得更大的风量。 Further, in the present embodiment, the radius of the hub 3 is r 3 , the distance between the farthest point on the blade and the center of rotation of the axial fan blade 1 is r 4 , and r 3 :r When 4 is between 0.2 and 0.3, a larger air volume can be obtained while ensuring the mounting strength of the hub 3 and the axial fan blade 1.
在以上基础上，本实施例提供一种轴流风机扇叶组件的尺寸：轴流扇叶1的厚度为2.0mm，r 4为185mm；r 3为42mm。将该轴流风机扇叶组件安装在暖风机上的时候，在保证噪音低于50dB(A)的情况下，距离出风口两米位置处的风速仍旧能达到0.5m/s，。 Based on the above, the embodiment provides a size of the axial fan blade assembly: the axial fan blade 1 has a thickness of 2.0 mm, r 4 is 185 mm, and r 3 is 42 mm. When the axial fan blade assembly is installed on the heater, the wind speed can reach 0.5m/s at a distance of two meters from the outlet when the noise is less than 50dB(A).
进一步的，本实施例提供一种轴流风机风道组件，其包括上述轴流风机扇叶组件，此外还包括导风管4。当然，导风管4是设置在轴流风机风道组件的进风口和出风口之间的。将轴流风机扇叶组件的轴流扇叶1设置在导风管4内，从而能够减少空气扰流，保证出风口获取更均匀舒适的风。Further, the embodiment provides an axial flow fan duct assembly including the above-described axial fan blade assembly, and further includes an air duct 4. Of course, the air duct 4 is disposed between the air inlet and the air outlet of the axial fan duct assembly. The axial fan blade 1 of the axial fan blade assembly is disposed in the air duct 4, thereby reducing air turbulence and ensuring a more uniform and comfortable wind at the air outlet.
请参见图2，轴流风机风道组件还包括出风导风罩5，并且所述导风管4的端部固定在所述出风导风罩5上。出风导风罩5和进风导风罩6安装的过程中，由于出风导风罩5上设置有以上导风管4，从而可以保护轴流扇叶1，防止轴流扇叶1被碰伤。优选但是不必须导风管4和出风导风罩5一体成型，从而能够降低整个轴流风机风道组件的装配难度。Referring to FIG. 2, the axial flow fan duct assembly further includes an air outlet hood 5, and an end of the air duct 4 is fixed to the air outlet hood 5. During the installation of the air outlet hood 5 and the air inlet hood 6, the upper air duct 4 is disposed on the air outlet hood 5, thereby protecting the axial fan blade 1 and preventing the axial fan blade 1 from being Bruises. Preferably, but not necessarily, the air duct 4 and the air outlet hood 5 are integrally formed, so that the assembly difficulty of the entire axial flow fan duct assembly can be reduced.
此外，所述导风管4沿着出风方向上横截面积逐渐减小，从而使得气 流在导风管4内加速，在出风导风罩5处获得较大的风速，以满足用户要求。In addition, the air duct 4 gradually decreases in cross-sectional area along the air exit direction, so that the airflow is accelerated in the air duct 4, and a large wind speed is obtained at the air outlet hood 5 to meet user requirements. .
请参见图3，本实施例中，出风导风罩的格栅7包括多条栅条，且所有栅条沿着圆周分布。当然，图3不构成对本申请出风导风罩的限制，例如本申请中出风导风罩的栅条也可以交叉设置。Referring to FIG. 3, in the present embodiment, the grille 7 of the air outlet hood includes a plurality of grid bars, and all the grid bars are distributed along the circumference. Of course, FIG. 3 does not constitute a limitation on the air outlet hood of the present application. For example, the grid strips of the air outlet hood in the present application may also be disposed at the same time.
图3中，朝着远离圆周中心的方向上，栅条的外侧段逐渐往扇叶的转动方向倾斜，图3中箭头指代的是扇叶转动方向。其中，“栅条的外侧段”指代的是栅条远离圆周中心的一段。栅条如此设置是为了保证扇叶处产生的气流更容易通过，减小风阻，从而在出风导风罩处获得更大的风速和风量。In Fig. 3, in the direction away from the center of the circumference, the outer section of the grid is gradually inclined toward the direction of rotation of the blade, and the arrow in Fig. 3 indicates the direction of rotation of the blade. Wherein, the "outer segment of the grid" refers to a segment of the grid that is away from the center of the circumference. The grid is arranged to ensure that the airflow generated at the fan blades is more easily passed, and the wind resistance is reduced, thereby obtaining a larger wind speed and air volume at the air outlet hood.
朝着远离圆周中心的方向上，图3中的栅条的内侧段的倾斜方向和外侧段的倾斜方向是不同的，其主要是为了使得格栅7获得较好的外观。很显然，为了减小风阻，整条栅条都可以设计成：朝着远离圆周中心的方向上，栅条逐渐往扇叶的转动方向倾斜。In the direction away from the center of the circumference, the inclination direction of the inner side section of the grid bar in Fig. 3 and the inclination direction of the outer side section are different, mainly for the purpose of obtaining a better appearance of the grid 7. Obviously, in order to reduce the wind resistance, the entire grid can be designed such that the grid is gradually inclined toward the direction of rotation of the blade in a direction away from the center of the circumference.
进一步的，当轴流风机风道组件包括导风管的时候，导风管沿着自身轴向投影在格栅7上得到第一投影线8，请参见图3。第一投影线8与栅条相交于第一点，栅条在该第一点上的切线一与第一投影线8在该点上的切线二之间的夹角为100°-115°。该种情况下可以进一步减小格栅7对气流的阻力，以获得较大的风速和风量。Further, when the axial flow fan duct assembly includes the air duct, the air duct is projected on the grille 7 along its own axial direction to obtain a first projection line 8, see FIG. The first projection line 8 intersects the grid bar at a first point, and the angle between the tangent line of the grid strip at the first point and the tangent line 2 of the first projection line 8 at the point is 100°-115°. In this case, the resistance of the grille 7 to the airflow can be further reduced to obtain a larger wind speed and air volume.
并且，通过实验发现，当切线一与切线二之间的夹角为105°的时候，格栅7可以获得最佳的导风性能。Moreover, it has been found through experiments that the grid 7 can obtain the best wind guiding performance when the angle between the tangent 1 and the tangent 2 is 105°.
为了进一步提高风量和风速，出风导风罩5的栅条沿着出风方向上截面逐渐增大，使得相邻格栅7栅条之间的出风面积沿着出风方向上逐渐减小。该种情况下，气流经过格栅7的时候在格栅7上形成加速压力，在出风口处形成较大风速，从而使得用户能够获得较佳的体验。In order to further increase the air volume and the wind speed, the cross section of the air outlet hood 5 gradually increases along the air flow direction, so that the air flow area between the adjacent grids 7 is gradually reduced along the air flow direction. . In this case, the airflow passes through the grille 7 to form an accelerating pressure on the grille 7, and a large wind speed is formed at the air outlet, thereby enabling the user to obtain a better experience.
为了进一步降低风阻，栅条沿着出风方向上呈流线型。并且栅条的数量为奇数条以降低共振产生的噪音。In order to further reduce the wind resistance, the grid strip is streamlined along the direction of the wind. And the number of bars is an odd number to reduce the noise generated by the resonance.
并且，本实施例中，进风导风罩6的进风面面积与所述出风导风罩5的出风面面积之比为1.1-1.35。该种情况下，可以在出风面上获得较大的风速，同时能够保证产品的美观性。通过实现发现，本实施例中进风导风 罩6的进风面面积和出风导风罩5的出风面面积之比为1.25的时候，从性能和美观上用户能获得最佳体验。Further, in the present embodiment, the ratio of the air inlet surface area of the inlet air hood 6 to the air outlet surface area of the air outlet hood 5 is 1.1-1.35. In this case, a large wind speed can be obtained on the wind surface while ensuring the aesthetic appearance of the product. By realizing that the ratio of the air inlet surface area of the air inlet hood 6 to the air surface area of the air outlet hood 5 in this embodiment is 1.25, the user can obtain the best experience from the viewpoint of performance and appearance.
图2中，进风导风罩6包括互成角度的第一进风面601、第二进风面602和第三进风面603。从而，进风导风罩6的进风面面积为第一进风面601、第二进风面602和第三进风面603的面积之和。在轴流风机风道组件其它结构不变的情况下，通过设置多个互成角度的进风面，能够增大进风导风罩6的进风面积，从而在保证产品美观性能的情况下，增大进风导风罩6的进风面面积与所述出风导风罩5的出风面面积的比值。当然，进风导风罩6上进风面数量不受附图限制，例如进风面也可以是其它任意多个，或者也可以是一个。并且，当进风导风罩6形成有多个进风面的时候，多个进风面之间的角度也不受附图的限制。In FIG. 2, the inlet air hood 6 includes a first air inlet surface 601, a second air inlet surface 602, and a third air inlet surface 603 which are angled with each other. Therefore, the air inlet surface area of the intake air hood 6 is the sum of the areas of the first air inlet surface 601, the second air inlet surface 602, and the third air inlet surface 603. In the case that the other structures of the axial flow fan duct assembly are unchanged, the air inlet area of the air inlet hood 6 can be increased by providing a plurality of air inlet surfaces that are mutually angled, thereby ensuring the aesthetic performance of the product. The ratio of the area of the inlet surface of the inlet hood 6 to the area of the outlet surface of the outlet hood 5 is increased. Of course, the number of air inlet surfaces on the air inlet hood 6 is not limited by the drawings. For example, the air inlet surface may be any other number, or may be one. Moreover, when the inlet air hood 6 is formed with a plurality of air inlet faces, the angle between the plurality of air inlet faces is also not limited by the drawings.
不失一般性，任何需要应用轴流风机的领域都可以采用以上提到的轴流扇叶1、轴流风机扇叶组件和轴流风机风道组件。例如，以上提到的轴流扇叶1、轴流风机扇叶组件和轴流风机风道组件，可以应用在暖风机、冷风机、普通风扇等产品上。Without loss of generality, any of the above-mentioned axial flow fans, axial fan blades and axial fan duct assemblies can be used in any field where axial fans are required. For example, the above-mentioned axial fan blade 1, axial fan blade assembly and axial fan duct assembly can be applied to products such as heaters, chillers, and ordinary fans.
以上实施方式仅用于说明本发明，而非对本发明的限制。尽管参照实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，对本发明的技术方案进行各种组合、修改或者等同替换，都不脱离本发明技术方案的精神和范围，均应涵盖在本发明的权利要求范围当中。The above embodiments are merely illustrative of the invention and are not intended to limit the invention. While the invention has been described in detail herein with reference to the embodiments of the embodiments of the present invention Within the scope of the claims of the present invention.

Claims (10)

  1. 一种轴流扇叶，其特征在于，其迎风缘上靠近叶尖的一端上形成有导流段，所述导流段上开设有多个导流槽；所述导流段的最近点与所述轴流扇叶的旋转中心之间的距离为r 1，所述导流段的最远点与所述轴流扇叶的旋转中心之间的距离为r 2，所述迎风缘上最远点与所述轴流扇叶的旋转中心之间的距离为r，且(r 2－r 1)：r＝1/3-1/2，且朝着旋转中心所述导流槽的深度逐渐减小。 An axial flow fan blade is characterized in that a flow guiding section is formed on one end of the windward edge near the tip of the blade, and a plurality of guiding grooves are opened on the guiding section; the closest point of the guiding section is a distance between the center of rotation of the axial fan blade is r 1 , a distance between a farthest point of the flow guiding segment and a center of rotation of the axial fan blade is r 2 , and the windward edge is the most The distance between the far point and the center of rotation of the axial fan blade is r, and (r 2 -r 1 ): r=1/3-1/2, and the depth of the guide groove toward the center of rotation slowing shrieking.
  2. 根据权利要求1所述的轴流扇叶，其特征在于，所述导流段呈锯齿状。The axial fan blade of claim 1 wherein said flow guiding section is serrated.
  3. 一种轴流风机扇叶组件，其特征在于，包括多片权利要求1或2所述的轴流扇叶，以及用于安装所述轴流扇叶的轮毂。An axial fan blade assembly comprising a plurality of axial fans according to claim 1 or 2 and a hub for mounting the axial blades.
  4. 根据权利要求3所述的轴流风机扇叶组件，其特征在于，所述轴流扇叶的数量为奇数。The axial flow fan blade assembly of claim 3 wherein the number of axial fan blades is an odd number.
  5. 根据权利要求4所述的轴流风机扇叶组件，其特征在于，所述轴流扇叶的数量为三片或者五片。The axial fan blade assembly according to claim 4, wherein the number of the axial fan blades is three or five.
  6. 根据权利要求3所述的轴流风机扇叶组件，其特征在于，所述轴流扇叶与轮毂的安装面相交于第一曲线，所述第一曲线上任意点的切线与所述轮毂的垂直面之间的夹角为30±5°。The axial flow fan blade assembly of claim 3, wherein the axial flow fan and the mounting surface of the hub intersect the first curve, the tangent to any point on the first curve and the hub The angle between the vertical faces is 30 ± 5 °.
  7. 根据权利要求3所述的轴流风机扇叶组件，其特征在于，所述轮毂的半径为r 3，所述扇叶上的最远点与所述轴流扇叶的旋转中心之间的距离为r 4，且r 3：r 4为0.2-0.3。 The axial flow fan blade assembly according to claim 3, wherein the radius of the hub is r 3 , the distance between the farthest point on the blade and the center of rotation of the axial fan blade Is r 4 and r 3 :r 4 is 0.2-0.3.
  8. 一种轴流风机风道组件，其特征在于，包括权利要求3-7中任意一项所述的轴流风机扇叶组件，还包括导风管，所述轴流风机扇叶组件的轴流扇叶位于所述导风管内。An axial flow fan duct assembly, comprising the axial flow fan blade assembly of any of claims 3-7, further comprising an air duct, the axial flow of the axial fan blade assembly The fan blades are located within the air duct.
  9. 根据权利要求8所述的轴流风机风道组件，其特征在于，所述导风管沿着出风方向上横截面积逐渐减小。The axial flow fan duct assembly according to claim 8, wherein the air duct is gradually reduced in cross-sectional area along the wind direction.
  10. 根据权利要求8所述的轴流风机风道组件，其特征在于，所述轴流风机风道组件还包括出风导风罩，所述导风管的端部固定在所述出风导风罩上。The axial flow fan duct assembly according to claim 8, wherein the axial flow fan duct assembly further comprises an air outlet hood, and an end of the air duct is fixed to the wind guide Covered.
PCT/CN2018/093266 2018-01-13 2018-06-28 Axial fan blade, axial fan blade assembly, and axial fan duct assembly WO2019136939A1 (en)

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