WO2019136940A1 - 一种轴流风机风道组件 - Google Patents

一种轴流风机风道组件 Download PDF

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Publication number
WO2019136940A1
WO2019136940A1 PCT/CN2018/093271 CN2018093271W WO2019136940A1 WO 2019136940 A1 WO2019136940 A1 WO 2019136940A1 CN 2018093271 W CN2018093271 W CN 2018093271W WO 2019136940 A1 WO2019136940 A1 WO 2019136940A1
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WO
WIPO (PCT)
Prior art keywords
air
duct assembly
axial flow
hood
flow fan
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PCT/CN2018/093271
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English (en)
French (fr)
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 US16/960,547 priority Critical patent/US11286954B1/en
Priority to EP18899786.0A priority patent/EP3726061B1/en
Publication of WO2019136940A1 publication Critical patent/WO2019136940A1/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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • 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
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • 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
    • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
    • F04D29/701—Suction grids; Strainers; Dust separation; Cleaning especially adapted for elastic fluid pumps

Definitions

  • the invention relates to an axial flow fan duct assembly.
  • the fan heater product often meets the requirements of the wind volume and wind speed of the whole machine under the condition that the noise requirement is less than 50 dB(A), resulting in the wind speed and air volume of the whole warm air industry being weak, and the basic feeling of the hot air one meter away. Less, the customer experience is poor.
  • the prior art means to reduce the wind surface and increase the air inlet surface, but whether to reduce the wind surface or increase the air inlet surface, it is necessary to adjust other structures of the product, wherein Small winds will also have a bad impact on the user experience.
  • the present invention aims to solve at least one of the technical problems existing in the prior art or related art.
  • One of the objects of the present invention is to provide an axial flow fan duct assembly that solves the problem of small wind speed at the air outlet existing in the prior art.
  • the present invention provides an axial flow fan duct assembly including an intake air hood and an air hood, the air inlet hood including a plurality of inlet faces that are angled at an angle, and The ratio of the air inlet surface area of the air inlet hood to the air outlet surface area of the air outlet hood is 1.1-1.35.
  • the ratio of the air inlet surface area of the air inlet hood to the air outlet surface area of the air outlet hood is 1.25.
  • the air inlet hood includes a first air inlet surface, a second air inlet surface, and a third air inlet surface that are angled with each other.
  • the axial fan duct assembly further includes an air duct, the fan blade being mounted in the air duct.
  • the end of the air duct is fixed to the air outlet hood.
  • the air duct gradually decreases in cross-sectional area along the wind direction.
  • a guiding section is formed on an end of the fan blade on the windward edge near the tip, and the guiding section is provided with a plurality of guiding grooves; a closest point of the guiding section and the fan
  • the distance between the centers of rotation of the leaves is r 1
  • the distance between the farthest point of the flow guiding segments and the center of rotation of the blades is r 2
  • the grille of the air outlet hood includes a plurality of grid bars.
  • all of the grid bars are distributed along the circumference, and at least the outer section of the grid strip is gradually inclined toward the direction of rotation of the blade in a direction away from the center of the circumference.
  • the axial flow fan duct assembly of claim 9 wherein when the axial fan duct assembly includes an air duct, the air duct is projected along the axial direction thereof Obtaining a first projection line on the grid, the first projection line intersecting the grid bar at a first point, a tangent line of the grid strip at the first point and a tangent to the first projection line at the point The angle between the two is 100°-115°.
  • the angle between the tangent 1 and the tangent 2 is 105°.
  • the cross-section of the grid strip gradually increases along the wind direction, such that an air flow area between adjacent grids gradually decreases along the wind direction.
  • the grid strip is streamlined along the wind direction.
  • the number of the bars is an odd number.
  • the axial flow fan air duct assembly of the present invention can provide a plurality of mutually angled air inlet surfaces for the air inlet air hood, and can be increased without changing other structures of the air heater.
  • the heater has a large wind speed and the noise is very high. Small.
  • FIG. 1 is a schematic structural view of an axial flow fan duct assembly of an embodiment
  • FIG. 2 is a schematic structural view of a blade 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 present application will be explained by taking only an axial fan duct assembly applied to a heater as an example.
  • the axial flow fan duct assembly of the present application in addition to being used for a heater, can also be used for other products that are close to or the same as the heater application.
  • the axial flow fan duct assembly of the embodiment includes an air inlet air duct 6 and an air outlet air duct 5 , and the air inlet air duct 6 includes a plurality of air inlet surfaces that are angled with each other, and The ratio of the air inlet surface area of the wind hood 6 to the air outlet surface area of the air outlet hood 5 is 1.1-1.35.
  • the air inlet hood 6 can be enlarged without changing other structures of the heater.
  • the ratio of the area of the inlet surface to the area of the outlet surface of the outlet hood 5 is such that a large wind speed is obtained at the outlet surface.
  • the heater can obtain a large wind speed and the noise is also very small.
  • the ratio of the inlet surface area of the inlet hood 6 to the outlet surface area of the outlet hood 5 is 1.25, the noise control, wind speed, and air volume control have great advantages in similar products.
  • the area of the air inlet surface of the air inlet hood 6 is the sum of the areas of all the air inlet surfaces of the air inlet hood 6.
  • the ratio of the inlet surface area of the inlet hood 6 to the outlet surface area of the outlet hood 5 is designed to be 1.1-1.35, and the air inlet hood is 6 Set a plurality of mutually angled inlet faces, which can beautify the heaters using the axial fan duct assembly, thereby obtaining the user's favor.
  • 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.
  • the air inlet surface area of the air inlet hood 6 can be ensured to be larger than that of the air outlet hood 5. Outlet area.
  • the air inlet surface of the air inlet hood 6 in this embodiment is not limited to three, and may also include one air inlet surface or three or more air inlet surfaces.
  • the axial flow fan duct assembly of the embodiment further includes an air duct 4, and the fan blade 1 of the axial fan duct assembly is installed in the air duct 4.
  • the air duct 4 is disposed between the air inlet hood 6 and the air hood 5 of the axial fan duct assembly.
  • the end portion of the air duct 4 and the air outlet hood 5 are fixed. Therefore, when the air hood 5 and the air inlet hood 6 are installed, the air duct 4 can serve as a protective cover for the blade 1 to prevent the blade 1 from being hit.
  • 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 cross-sectional area of the air guiding duct 4 is gradually decreased along the air blowing direction, so that the airflow is accelerated in the air guiding duct 4, and a large wind speed is obtained at the air guiding hood 5 to further satisfy the user's right.
  • the demand for wind speed and air volume is not limited to, but not limited to, but not limited to,
  • a guide section is formed on one end of the fan blade 1 on the windward edge near the tip end, and a plurality of guide channels 2 are formed on the guide section;
  • the distance between the nearest point of the flow segment and the center of rotation of the blade 1 is r 1
  • the distance between the farthest point of the flow segment and the center of rotation of the blade 1 is r 2
  • the above nearest point and farthest point are relative to the center of rotation O.
  • the tip refers to the portion of the blade 1 that is away from the center of rotation O
  • the root of the blade is the portion of the blade 1 that is near 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 toward the center of rotation of the flow guiding groove 2 is gradually reduced, that is, the depth is further away from the airflow source guiding groove 2, so that the wind speed can be made uniform, and the wind experienced by the user is more natural. Therefore, the 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. 2 there is still some distance between the farthest point of the guiding section and the tip of the blade, and the distance can be adjusted within a certain interval, thereby facilitating the processing of the guiding 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 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 avoid the blade formed when the guiding section is formed at one end of the blade root. 1 problem of reduced strength. Once the strength of the blade 1 is lowered, not only will the service life of the blade 1 be shortened, but even the use of the fan 1 will increase the noise of the blade 1 even when used.
  • the guiding groove 2 on the guiding section 2 gradually decreases toward the center of rotation, so that the current fan blade 1 can be processed to obtain the above guiding section, and It has any influence on the strength of the blade 1 so that it does not require an additional separate design of the blade 1.
  • the resistance of the air to the blade 1 can also be reduced, thereby effectively reducing the motor load, thereby increasing the wind speed at the same power.
  • the guide groove 2 has a regular zigzag shape, which is not only easy to process, but also has a decorative effect when distributed at the tip of the blade 1.
  • the guide grooves 2 are in a regular zigzag shape, it is further possible to select all the guide grooves 2 to be equal in width.
  • the flow guiding groove 2 may have any other shape in addition to the zigzag shape, as long as it can split the air flow.
  • the blade 1 is mounted on the hub 3, assuming that the mounting surface of the blade 1 and the hub 3 intersects the first curve, when the angle between the tangent at any point on the first curve and the vertical plane of the hub 3 is 30 ⁇ 5 °, the axial flow fan duct assembly can get more air volume when working, while obtaining higher motor performance and lower noise under the same working conditions.
  • the mounting surface of the hub 3 is also the cylindrical surface on the hub 3 for mounting the 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 blade 1 that are equal to the central axis of the hub 3 are connected to equidistant lines, and then the equidistant lines are projected along the radial direction of the hub 3 on the mounting surface of the hub 3 to obtain a second projection line. Then, when the maximum value of the angle between the tangent of any point on the second projection line and the vertical plane of the hub 3 is 42 ⁇ 5°, the performance of the axial flow fan duct assembly can be further improved, so that the axial fan wind
  • the tower assembly works with high wind speed, high air volume and low noise.
  • the curvature distribution value of the blade 1 is 0-0.176, so that the blade 1 obtains the best performance.
  • the radius of the hub 3 is r 3
  • the distance between the farthest point on the blade 1 and the center of rotation of the blade 1 is r 4
  • r 3 : r 4 is
  • 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 is gradually inclined toward the direction of rotation of the blade in a direction away from the center of the circumference, 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 wind direction, so that the air flow area between the adjacent grids gradually decreases along the air 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 grid bars of the grid 7 is an odd number to reduce the noise generated by the resonance.

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

Abstract

轴流风机风道组件，包括进风导风罩（6）以及出风导风罩（5），进风导风罩（6）包括互成角度的多个进风面，且进风导风罩（6）的进风面面积与出风导风罩（5）的出风面面积之比为1.1-1.35。进风导风罩设置成互成角度的进风面，可以增大进风导风罩的进风面积与出风导风罩的出风面面积之比，从而获得较大风速的同时，噪音也小。

Description

一种轴流风机风道组件
交叉引用
本申请引用于2018年01月13日提交的专利名称为“一种轴流风机风道组件”的第2018200542028号中国专利申请，其通过引用被全部并入本申请。
技术领域
本发明涉及一种轴流风机风道组件。
背景技术
现有技术中的暖风机产品，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。为了提高风速，现有技术的手段包括减小出风面和增大进风面，但是不论是减小出风面还是增大进风面，都将需要对产品的其它结构进行调整，其中减小出风面也将对用户体验造成不好的影响。
发明内容
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。
本发明的其中一个目的是：提供一种轴流风机风道组件，解决现有技术中存在的出风口处风速小的问题。
为了实现该目的，本发明提供了一种轴流风机风道组件，包括进风导风罩以及出风导风罩，所述进风导风罩包括互成角度的多个进风面，且所述进风导风罩的进风面面积与所述出风导风罩的出风面面积之比为1.1-1.35。
可选地，所述进风导风罩的进风面面积与所述出风导风罩的出风面面积之比为1.25。
可选地，所述进风导风罩包括互成角度的第一进风面、第二进风面和第三进风面。
可选地，所述轴流风机风道组件还包括导风管，扇叶安装在所述导风 管内。
可选地，所述导风管的端部和所述出风导风罩固定。
可选地，所述导风管沿着出风方向上横截面积逐渐减小。
可选地，所述扇叶的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。
可选地，所述出风导风罩的格栅包括多条栅条。
可选地，所有所述栅条沿着圆周分布，朝着远离所述圆周中心的方向上，至少所述栅条的外侧段逐渐往扇叶的转动方向倾斜。10、根据权利要求9所述的轴流风机风道组件，其特征在于，当所述轴流风机风道组件包括导风管的时候，所述导风管沿着自身轴向投影在所述格栅上得到第一投影线，所述第一投影线与所述栅条相交于第一点，所述栅条在该第一点上的切线一与第一投影线在该点上的切线二之间的夹角为100°-115°。
可选地，所述切线一与切线二之间的夹角为105°。
可选地，所述栅条沿着出风方向上横截面逐渐增大，使得相邻所述格栅之间的出风面积沿着出风方向上逐渐减小。
可选地，所述栅条沿着出风方向上呈流线型。
可选地，所述栅条的数量为奇数。
本发明的技术方案具有以下优点：本发明的轴流风机风道组件，通过给进风导风罩设置多个互成角度的进风面，可在不改变暖风机其它结构的情况下，增大进风导风罩的进风面面积与所述出风导风罩的出风面面积之比，从而在出风面出获得较大的风速。并且，通过将所述进风导风罩的进风面面积与所述出风导风罩的出风面面积之比设计为1.1-1.35，使得暖风机获得较大风速的同时，噪音也非常的小。
附图说明
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。
图1是实施例的轴流风机风道组件的结构示意图；
图2是实施例的扇叶的结构示意图；
图3是实施例中栅条的安装示意图；
图中：1、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；7、格栅；8、第一投影线。
具体实施方式
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。
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。
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。
下面本申请将仅仅以应用在暖风机上的轴流风机风道组件为例对本申请进行解释说明。不失一般性，本申请的轴流风机风道组件，其除了可以用于暖风机，也可以用于其它和暖风机应用场合接近或者相同的产品上。
请参见图1，本实施例的轴流风机风道组件，包括进风导风罩6以及出风导风罩5，进风导风罩6包括互成角度的多个进风面，且进风导风罩 6的进风面面积与出风导风罩5的出风面面积之比为1.1-1.35。
本实施例的轴流风机风道组件，通过给进风导风罩6设置多个互成角度的进风面，可在不改变暖风机其它结构的情况下，增大进风导风罩6的进风面面积与出风导风罩5的出风面面积之比，从而在出风面出获得较大的风速。并且，通过将进风导风罩6的进风面面积与出风导风罩5的出风面面积之比设计为1.1-1.35，使得暖风机获得较大风速的同时，噪音也非常的小。尤其是进风导风罩6的进风面面积与出风导风罩5的出风面面积之比为1.25的时候，其噪音控制和风速、风量控制在同类产品中具有非常大的优势。
其中，进风导风罩6的进风面面积也即进风导风罩6所有的进风面的面积之和。
非常值得一提的是，在增大进风导风罩6的进风面面积与出风导风罩5的出风面面积之比的时候，往往使得采用该轴流风机风道组件的暖风机不美观。而本实施例的轴流风机风道组件，将进风导风罩6的进风面面积与出风导风罩5的出风面面积之比设计为1.1-1.35，且进风导风罩6设置多个互成角度的进风面，其可以美化使用该轴流风机风道组件的暖风机，从而获得用户的青睐。
图1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。该种情况下，在进风导风罩6横截面面积小于出风导风罩5横截面面积的时候，也能保证进风导风罩6的进风面面积大于出风导风罩5的出风面面积。
当然，本实施例中进风导风罩6的进风面不局限为三个，其也可以包括一个进风面或者三个以上进风面。
进一步的，本实施例的轴流风机风道组件还包括导风管4，轴流风机风道组件的扇叶1安装在导风管4内。当然，导风管4是设置在轴流风机风道组件的进风导风罩6和出风导风罩5之间的。通过设置导风管4并将扇叶1安装在导风管4内，可以防止空气扰流，从而在出风面获取均匀的气流，提高用户的体验。
本实施例中，将导风管4的端部和出风导风罩5固定。从而，出风导风罩5和进风导风罩6安装的时候，导风管4可以作为扇叶1的保护罩防 止扇叶1被碰上。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。
此外，优选导风管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，以进一步满足用户对风速、风量的需求。
请参见图2，本实施例的轴流风机风道组件，其扇叶1的迎风缘上靠近叶尖的一端上形成有导流段，导流段上开设有多个导流槽2；导流段的最近点与扇叶1的旋转中心之间的距离为r 1，导流段的最远点与扇叶1的旋转中心之间的距离为r 2，迎风缘上最远点与扇叶1的旋转中心之间的距离为r，且(r 2－r 1)：r＝1/3-1/2，且朝着旋转中心导流槽2的深度逐渐减小。
以上最近点和最远点都是相对旋转中心O而言的。并且，叶尖指的是扇叶1上远离旋转中心O的部分，而叶根则是扇叶1上靠近旋转中心O的部分。
本实施例的扇叶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。
图2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。
通过实验比对发现，在位于扇叶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扇叶1的迎风缘上形成有导流段的降噪效果几乎差不大。
并且，导流段仅仅设置在扇叶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扇叶1强度降低的问题。一旦扇叶1强度降低，不仅将导致扇叶1的使用寿命缩短，甚至在使用的时候因为扇叶1的颤动还会升高扇叶 1的噪音。
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，因此可以在当前的扇叶1上进行加工以得到以上导流段，并且不会对扇叶1的强度造成任何影响，从而其无需额外单独设计扇叶1。
并且，在扇叶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。
本实施例中，优选导流槽2呈规则的锯齿状，其不仅便于加工，并且分布在扇叶1叶尖的时候还能起到装饰效果。当导流槽2呈规则的锯齿状的时候，进一步可以选择所有导流槽2等宽。当然，导流槽2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。
将扇叶1安装在轮毂3上，假设扇叶1与轮毂3的安装面相交于第一曲线，当第一曲线上任意点的切线与轮毂3的垂直面之间的夹角为30±5°，轴流风机风道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。
其中，轮毂3的安装面也即轮毂3上用于安装扇叶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。
进一步的，将扇叶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，得到第二投影线，那么该第二投影线上任意点的切线与轮毂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风道组件的性能，使得轴流风机风道组件工作时候获取高风速、大风量和低噪音。
其中，优选但是不必须扇叶1的曲率分布值为0-0.176，以使得扇叶1获得最佳的性能
此外，本实施例中，本实施例中，轮毂3的半径为r 3，扇叶1上的最远点与扇叶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和扇叶1的安装强度的前提下，获得更大的风量。
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。
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。
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。
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。
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。
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。
为了进一步降低风阻，栅条沿着出风方向上呈流线型。并且格栅7栅条的数量为奇数条以降低共振产生的噪音。
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。

Claims (13)

  1. 一种轴流风机风道组件，包括进风导风罩以及出风导风罩，其特征在于，所述进风导风罩包括互成角度的多个进风面，且所述进风导风罩的进风面面积与所述出风导风罩的出风面面积之比为1.1-1.35。
  2. 根据权利要求1所述的轴流风机风道组件，其特征在于，所述进风导风罩的进风面面积与所述出风导风罩的出风面面积之比为1.25。
  3. 根据权利要求1所述的轴流风机风道组件，其特征在于，所述进风导风罩包括互成角度的第一进风面、第二进风面和第三进风面。
  4. 根据权利要求1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导风管，扇叶安装在所述导风管内。
  5. 根据权利要求4所述的轴流风机风道组件，其特征在于，所述导风管的端部和所述出风导风罩固定。
  6. 根据权利要求4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。
  7. 根据权利要求4所述的轴流风机风道组件，其特征在于，所述扇叶的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。
  8. 根据权利要求1至7中任意一项所述的轴流风机风道组件，其特征在于，所述出风导风罩的格栅包括多条栅条。
  9. 根据权利要求8所述的轴流风机风道组件，其特征在于，所有所述栅条沿着圆周分布，朝着远离所述圆周中心的方向上，至少所述栅条的外侧段逐渐往扇叶的转动方向倾斜。10、根据权利要求9所述的轴流风机风道组件，其特征在于，当所述轴流风机风道组件包括导风管的时候，所述导风管沿着自身轴向投影在所述格栅上得到第一投影线，所述第一投影线与所述栅条相交于第一点，所述栅条在该第一点上的切线一与第一投影线在该点上的切线二之间的夹角为100°-115°。
  10. 根据权利要求10所述的轴流风机风道组件，其特征在于，所述 切线一与切线二之间的夹角为105°。
  11. 根据权利要求8所述的轴流风机风道组件，其特征在于，所述栅条沿着出风方向上横截面逐渐增大，使得相邻所述格栅之间的出风面积沿着出风方向上逐渐减小。
  12. 根据权利要求12所述的轴流风机风道组件，其特征在于，所述栅条沿着出风方向上呈流线型。
  13. 根据权利要求8所述的轴流风机风道组件，轴流风机风道组件其特征在于，所述栅条的数量为奇数。
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