WO2022062832A1 - 轴流风机的导风圈及轴流风机 - Google Patents

轴流风机的导风圈及轴流风机 Download PDF

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Publication number
WO2022062832A1
WO2022062832A1 PCT/CN2021/114953 CN2021114953W WO2022062832A1 WO 2022062832 A1 WO2022062832 A1 WO 2022062832A1 CN 2021114953 W CN2021114953 W CN 2021114953W WO 2022062832 A1 WO2022062832 A1 WO 2022062832A1
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Prior art keywords
axial flow
flow fan
air guide
diffuser
guide
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PCT/CN2021/114953
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English (en)
French (fr)
Inventor
宋文杰
郭威
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依必安派特风机(上海)有限公司
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Priority claimed from CN202011025721.XA external-priority patent/CN112032110A/zh
Priority claimed from CN202022139304.XU external-priority patent/CN212318379U/zh
Application filed by 依必安派特风机(上海)有限公司 filed Critical 依必安派特风机(上海)有限公司
Publication of WO2022062832A1 publication Critical patent/WO2022062832A1/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
    • 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

Definitions

  • the present application relates to the technical field of fans, for example, to an air guide ring of an axial fan and an axial fan.
  • the axial flow fan will install a metal protective net at the air outlet of the air guide ring.
  • the installation of the metal protective net requires additional installation man-hours, and the metal protective net needs to make additional molds, which improves the performance of the axial flow fan. production cost.
  • an annular integrated protective net is usually integrated into the guide vane of the axial flow fan.
  • the axial thickness of the integrated protective net is usually the same as the axial thickness of the guide vane. Consistently, the distance between the impeller and the protective net is too close, and the airflow hits the integrated protective net, resulting in a louder noise.
  • a diffuser is often installed at the air outlet of the air guide ring, and in order to reduce the axial flow of the axial flow fan
  • the size of the guide vane is usually arranged on the diffuser, but during the manufacturing process of the wind guide ring, the junction between the guide vane and the diffuser cannot be directly demolded, and steps will be generated at the junction, which will destroy the shape of the diffuser. , weakening the effect of the diffuser.
  • the present application provides an air guide ring for an axial flow fan and an axial flow fan, which can reduce the noise of the axial flow fan during operation, and also improve the efficiency, air volume and wind pressure of the axial flow fan.
  • an air guide ring for an axial flow fan including:
  • the diffusing part extends outward from one end of the air guide tube
  • each guide vane includes a first end, a second end, a leading edge and a trailing edge, and the first end is fixed on the air guide tube.
  • the inner wall, the second end is opposite to the first end, the leading edge faces away from the direction of the opening of the diffuser, the trailing edge faces the direction of the opening of the diffuser, and the guide vane faces
  • the surface of the diffuser is a pressure surface, and the surface of the guide vane facing away from the diffuser is a suction surface;
  • the protective net includes a plurality of spliced rings distributed along the radial direction of the air guide tube, each of the spliced rings includes a plurality of arc segments, and each of the arc segments is connected to a between two adjacent guide vanes;
  • each arc segment is fixed at a position where the suction surface of one of the guide vanes is close to the trailing edge, and the second end of each arc segment is fixed on all the adjacent guide vanes.
  • the pressure surface is close to the leading edge.
  • the present application provides an axial flow fan, including the aforementioned wind guide ring of the axial flow fan.
  • Fig. 1 is the schematic diagram of the air guide ring of the axial flow fan of the present application
  • FIG. 2 is a schematic cross-sectional view of the air guide ring of the axial flow fan of the present application.
  • connection should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements.
  • connection may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements.
  • a first feature "on” or “under” a second feature may include direct contact between the first and second features, or may include the first and second features Not directly but through additional features between them.
  • the first feature being “above”, “over” and “above” the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature.
  • the first feature is “below”, “below” and “below” the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.
  • the air guide ring of the axial flow fan and the axial flow fan provided by the present application is suitable for the axial flow fan, the air guide ring can reduce the noise generated by the airflow hitting the protective net 4, and can not damage the air guide ring to diffuse the pressure
  • the partial structure improves the static pressure and efficiency of the axial flow fan, and reduces the noise generated by the airflow hitting the guide vanes 3 and the protective net 4 .
  • the air guide ring of the axial flow fan provided in this embodiment, as shown in FIG. 1 , includes an air guide tube 1 , a diffuser 2 , a guide vane 3 and a protective net 4 , wherein the air guide tube 1 is the main part of the air guide ring , the diffuser 2 extends outward from one end of the air guide tube 1, and the diffuser 2 is set to recover a certain kinetic energy of the airflow to increase the pressure, improve the static pressure and efficiency of the axial flow fan, and can also be set to reduce the flow rate of the airflow , reducing the noise generated by the airflow hitting the guide vanes 3 and the protective net 4 .
  • the first end of the guide vane 3 is fixed on the inner wall of the air guide tube 1, and is set to recover kinetic energy and convert it into potential energy, so as to improve the static pressure and efficiency of the axial flow fan.
  • the protective net 4 includes a plurality of splicing rings distributed along the radial direction of the air guide tube 1, each splicing ring includes a plurality of arc segments 41, and each arc segment 41 is connected to the adjacent two guide vanes 3. and set to prevent the impeller of the axial flow fan from colliding with foreign objects.
  • the center of the air guide tube 1 is provided with a fixing portion 5 , the second end portions 36 of the plurality of guide vanes 3 are fixed to the fixing portion 5 along the circumferential direction, and the fixing portion 5 is set to fix the motor and impeller.
  • the shape of the extension of the diffuser 2 is a straight line, an arc, a curve or a multi-segmented arc, and the diffuser 2 of different shapes It can meet the requirements of efficiency and noise of different types of axial flow fans. In the production operation of axial flow fans, air guide rings of different shapes of the diffuser 2 can be produced according to the needs.
  • the guide vane 3 includes a first end portion 35 , a second end portion 36 , a leading edge 34 and a trailing edge 33 , and the first end portion 35 is fixed to the air guide tube 1 .
  • the second end portion 36 is opposite to the first end portion 35, the leading edge 34 faces away from the opening direction of the diffuser portion 2, the trailing edge 33 faces the opening direction of the diffuser portion 2, and the surface of the guide vane 3 facing the diffuser portion 2 is:
  • the pressure surface 31, the surface of the guide vane 3 away from the diffuser 2 is the suction surface 32, the first end 35 of the guide vane 3 is fixed on the inner wall of the air guide tube 1, and the diffuser 2 of the air guide ring is not connected.
  • the static pressure and efficiency of the axial flow fan can be increased through the recovered kinetic energy, the flow velocity of the airflow can be reduced through the diffuser, and the noise generated by the airflow hitting the guide vanes 3 and the protective net 4 can be reduced.
  • the plurality of guide vanes 3 are evenly distributed in the air guide tube 1 along the circumferential direction, which can improve the effect of the guide vanes 3 recovering kinetic energy.
  • the number of guide vanes 3 is at least 11, which can ensure Guide vanes 3 recover kinetic energy for all airflow.
  • the highest point of the first end portion 35 of the guide vane 3 is lower than the highest point of the second end portion 36 , so that the fixed portion 5 is in the axial direction.
  • the axial dimension of the axial flow fan can be reduced.
  • the highest point of the first end portion 35 is made lower than the highest point of the second end portion 36, while ensuring that the first end portion 35 is on the inner wall of the air guide tube 1 In this way, the distance between the impeller of the axial flow fan and some of the guide vanes 3 can be increased, and the noise generated by the airflow hitting the guide vanes 3 and the protective net 4 can be reduced.
  • the guide vane 3 includes a straight section and a bent section that are connected to each other, one end of the straight section is the second end 36 , the bent section is bent away from the opening of the diffuser 2 and one end of the bent section is the first end 36 .
  • the setting of the straight section can make some of the guide vanes 3 as far away from the impeller as possible, reducing the noise caused by the impeller wake hitting the guide vane 3 and the protective net 4, and the setting of the bent section ensures the first One end portion 35 is located on the inner wall of the air guide tube 1 .
  • the length ratio of the straight section and the bent section in the radial direction is set to 3:1-1:1.
  • the length ratio of the straight section and the bent section in the radial direction can be set to 3:1, which can increase the part of the guide vane 3 away from the impeller and reduce the noise.
  • the length ratio of the segment and the bending segment in the radial direction is set to 1:1 to reduce the processing difficulty.
  • the length ratio of the straight section and the bent section in the radial direction may be any ratio from 3:1 to 1:1.
  • the first end of the arc segment 41 of the protective net 4 is fixed to the position where the suction surface 32 of one of the guide vanes 3 is close to the trailing edge 33, and the second end of the arc segment 41 is fixed to the adjacent guide vane 3.
  • the protective net 4 of the arc segment 41 can be inclined in the axial direction of the air guide ring, and the multiple arc segments 41 in the radial direction are distributed in steps, and the airflow hits The time of the front end of the protective net 4 will be staggered, which reduces the noise.
  • the thickness of the arc segment 41 along the axial direction of the air guide tube 1 is not more than a quarter of the thickness of the guide vane 3 along the axial direction of the air guide tube 1, so as to ensure the air volume, it is convenient for the protection net 4 to be demolded, And can reduce materials and reduce costs.
  • the air guide tube 1 , the diffuser portion 2 , the guide vanes 3 , the protective net 4 and the fixing portion 5 are integrally formed, which can reduce the processing cost and does not require additional man-hours to install the additional protective net 4 .
  • the axial flow fan provided in this embodiment includes the aforementioned air guide ring of the axial flow fan.
  • the axial flow fan has low noise, high efficiency, and large air volume and pressure.
  • the wind guide ring of the axial flow fan and the axial flow fan provided by the present application pass through the protective net 4 of the circular arc segment 41 integrated on the guide vane 3, and the two ends of the circular arc segment 41 are respectively
  • the position where the suction surface 32 of the two adjacent guide vanes 3 is close to the trailing edge 33 and the position where the pressure surface 31 is close to the leading edge 34 can make the protective net 4 of the arc segment 41 appear in the axial direction of the wind guide ring.
  • the time of the impeller wake hitting the front end of the protective net 4 will be staggered, which can reduce the noise of the axial flow fan; the first end 35 of the guide vane 3 is fixed to the wind guide In the cylinder 1, there is no connection with the diffuser 2 of the air guide ring, and the shape of the diffuser 2 is not damaged.
  • the static pressure and efficiency of the axial flow fan can be increased through the recovered kinetic energy, and the flow rate of the airflow can be reduced through the diffuser.
  • the noise generated by the airflow hitting the guide vane 3 and the protective net 4 is reduced.
  • the guide vane 3 as a straight section and a bent section, the distance between the guide vane 3 and the impeller can be reduced, and the impact of the axial flow fan can be reduced. noise.

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

Abstract

轴流风机的导风圈及轴流风机。导风圈包括导风筒（1），导风筒（1）的一端向外延伸有扩压部（2）；多个导叶（3）沿周向均布于导风筒（1）中且一端固定于导风筒（1）内壁；防护网（4）包括多个沿导风筒（1）的径向分布的拼接圆环，每个拼接圆环包括多个圆弧段（41），每个圆弧段（41）均连接于相邻两个导叶（3）之间，圆弧段（41）在导风圈轴向上呈倾斜布置。该导风圈能够减小轴流风机的噪音。

Description

轴流风机的导风圈及轴流风机
本申请要求申请日为2020年9月25日、申请号为202011025721.X，以及申请日为2020年9月25日、申请号为202022139304.X的中国专利申请的优先权，以上申请的全部内容通过引用结合在本申请中。
技术领域
本申请涉及风机技术领域，例如涉及一种轴流风机的导风圈及轴流风机。
背景技术
为了避免叶轮与异物发生碰撞，轴流风机会在导风圈的出风口安装金属的防护网，安装金属防护网需要额外的安装工时，并且金属防护网需要制作额外的模具，提高了轴流风机的制作成本。为了解决上述问题，目前通常会在轴流风机的导叶集成圆环状的一体式的防护网，但是由于脱模技术的限制，集成的防护网轴向的厚度通常与导叶轴向的厚度一致，导致叶轮与防护网之间的距离太近，气流撞击在集成的防护网上，产生较大的噪音。
此外，为了增加轴流风机的效率以及风量和风压，减小气流撞击导叶和防护网产生的噪音，往往在导风圈的出风口处设置扩压器，而为了减小轴流风机轴向的尺寸，导叶通常布置于扩压器上，但是在导风圈的制造过程中，导叶和扩压器的交接处由于无法直接脱模，交接处会产生台阶，破坏扩压器的形状，减弱扩压器的作用。
发明内容
本申请提供一种轴流风机的导风圈及轴流风机，能够减小轴流风机工作时的噪音，还提高了轴流风机的效率以及风量和风压。
一方面，本申请提供了一种轴流风机的导风圈，包括：
导风筒；
扩压部，所述扩压部由所述导风筒的一端向外延伸；
多个导叶，沿周向均布于所述导风筒中，每个导叶包括第一端部、第二端部、前缘及尾缘，所述第一端部固定于所述导风筒的内壁，所述第二端部与所述第一端部相对，所述前缘背离所述扩压部开口的方向，所述尾缘朝向所述扩 压部开口的方向，所述导叶朝向所述扩压部的面为压力面，所述导叶背离所述扩压部的面为吸力面；
防护网，所述防护网包括多个沿所述导风筒的径向分布的拼接圆环，每个所述拼接圆环包括多个圆弧段，每个所述圆弧段均连接于相邻两个导叶之间；
其中，每个圆弧段的第一端固定于其中一个所述导叶的所述吸力面靠近所述尾缘的位置处，每个圆弧段的第二端固定于相邻导叶的所述压力面靠近所述前缘的位置处。
另一方面，本申请提供了一种轴流风机，包括前述的轴流风机的导风圈。
附图说明
图1是本申请轴流风机的导风圈的示意图；
图2是本申请轴流风机的导风圈的截面示意图。
图中：1、导风筒；2、扩压部；3、导叶；31、压力面；32、吸力面；33、尾缘；34、前缘；35、第一端部；36、第二端部；4、防护网；41、圆弧段；5、固定部。
具体实施方式
在本申请的描述中，除非另有明确的规定和限定，术语“相连”、“连接”、“固定”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；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，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，可以具体情况理解上述术语在本申请中的具体含义。
在本申请中，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下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。
在本实施例的描述中，术语“上”、“下”、“右”、等方位或位置关系为基于 附图所示的方位或位置关系，仅是为了便于描述和简化操作，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申请的限制。此外，术语“第一”、“第二”仅仅用于在描述上加以区分，并没有特殊的含义。
本申请提供的轴流风机的导风圈及轴流风机，该导风圈适用于轴流风机，该导风圈能够降低气流撞击防护网4产生的噪音，并且能够不破坏导风圈扩压部分的结构，提高了轴流风机的静压和效率，减小了气流撞击导叶3和防护网4产生的噪音。
本实施例提供的轴流风机的导风圈，如图1所示，包括导风筒1、扩压部2、导叶3以及防护网4，其中导风筒1为导风圈的主体部分，扩压部2由导风筒1的一端向外延伸，且扩压部2设置为回收气流一定的动能进而增加压力，提高轴流风机的静压和效率，还可以设置为降低气流的流速，减小气流撞击导叶3和防护网4产生的噪音。导叶3的第一端固定于导风筒1的内壁，且设置为回收动能且转化成势能，提高轴流风机的静压和效率。防护网4包括多个沿导风筒1的径向分布的拼接圆环，每个拼接圆环包括多个圆弧段41，每个圆弧段41均连接于相邻两个导叶3之间，且设置为避免轴流风机的叶轮与异物发生碰撞。
本实施例中，如图1所示，导风筒1的中心设有固定部5，多个导叶3的第二端部36沿周向固定于固定部5，固定部5设置为固定电机及叶轮。
本实施例中，如图2所示，过导风筒1轴心的截面上，扩压部2延伸的形状为直线、弧线、曲线或多段拼接的弧线，不同形状的扩压部2可以满足不同型号轴流风机效率及噪音的要求，在轴流风机的生产作业中，可以根据需求，生产不同形状扩压部2的导风圈。
本实施例中，如图1、图2所示，导叶3包括第一端部35、第二端部36、前缘34及尾缘33，第一端部35固定于导风筒1的内壁，第二端部36与第一端部35相对，前缘34背离扩压部2开口的方向，尾缘33朝向扩压部2开口的方向，导叶3朝向扩压部2的面为压力面31，导叶3背离扩压部2的面为吸力面32，将导叶3的第一端部35固定于导风筒1的内壁，和导风圈的扩压部2未有交接，不破坏扩压部2的形状，能够通过回收的动能增加轴流风机的静压和效率，通过扩压器降低气流的流速，减小气流撞击导叶3和防护网4产生的噪音。其中，导叶3有多个，多个导叶3沿周向均布于导风筒1中，能够提升导 叶3回收动能的效果，可选地，导叶3的数量至少有11个，能够保证导叶3对所有的气流回收动能。
可选地，如图2所示，在扩压部2开口的朝向上，导叶3第一端部35的最高点低于第二端部36的最高点，使固定部5在轴向上靠近扩压部2的端部，能够减小轴流风机的轴向尺寸。此外，当轴流风机的轴向尺寸确定的时候，使第一端部35的最高点低于第二端部36的最高点，在保证第一端部35处于导风筒1内壁上的情况下，能够增加轴流风机叶轮与部分导叶3之间的距离，减小气流撞击导叶3和防护网4产生的噪音。其中，导叶3包括相互连接的平直段和弯折段，平直段的一端为第二端部36，弯折段向远离扩压部2开口方向弯折且弯折段的一端为第一端部35，平直段的设置能够使部分导叶3尽可能的远离叶轮，减小叶轮尾迹撞击导叶3和防护网4产生的噪音，而弯折段的设置，则是保证了第一端部35处于导风筒1的内壁上。可选地，在不影响导叶3作用的情况下，将平直段与弯折段在径向上的长度比例设为3:1-1:1，当设计的轴流风机噪音较大时，可以将平直段与弯折段在径向上的长度比例设为3:1，能够加大导叶3远离叶轮的部分，降低噪音，当设计的轴流风机噪音较小时，则可以将平直段与弯折段在径向上的长度比例设为1:1，降低加工难度。其中，平直段与弯折段在径向上的长度比例可以为3:1-1:1中的任意一个比例。
本实施例中，防护网4的圆弧段41的第一端固定于其中一个导叶3的吸力面32靠近尾缘33的位置处，圆弧段41的第二端固定于相邻的导叶3的压力面31靠近前缘34的位置处，能够使圆弧段41的防护网4在导风圈轴向上呈倾斜分布，并且径向上多个圆弧段41呈阶梯分布，气流撞击防护网4前端的时间会错开，减小了噪音。可选地，圆弧段41沿导风筒1轴向的厚度不超过导叶3沿导风筒1轴向的厚度的四分之一，保证风量的情况下，便于防护网4脱模，并且能够减少用料，降低成本。
可选地，导风筒1、扩压部2、导叶3、防护网4及固定部5一体成型，能够降低加工成本，不需要额外工时安装额外的防护网4。
本实施例提供的轴流风机，包括前述的轴流风机的导风圈，该轴流风机的噪音小，效率高，风量风压大。
通过上述实施方式可以看出，本申请提供的轴流风机的导风圈及轴流风机，其通过在导叶3上集成圆弧段41的防护网4，且圆弧段41的两端分别固定于相邻两个导叶3的吸力面32靠近尾缘33的位置处和压力面31靠近前缘34 的位置处，能够使圆弧段41的防护网4在导风圈轴向上呈倾斜分布，并且径向上多个圆弧段41呈阶梯分布，叶轮尾迹撞击防护网4前端的时间会错开，能够减小轴流风机的噪音；导叶3的第一端部35固定于导风筒1内，和导风圈的扩压部2未有交接，不破坏扩压部2的形状，能够通过回收的动能增加轴流风机的静压和效率，通过扩压器降低气流的流速，减小气流撞击导叶3和防护网4产生的噪音，此外，通过设置导叶3为平直段与弯折段，能够减小导叶3与叶轮之间的距离，减小轴流风机的噪音。

Claims (10)

  1. 一种轴流风机的导风圈，包括：
    导风筒(1)；
    扩压部(2)，所述扩压部(2)由所述导风筒(1)的一端向外延伸；
    多个导叶(3)，沿周向均布于所述导风筒(1)中，每个导叶(3)包括第一端部(35)、第二端部(36)、前缘(34)及尾缘(33)，所述第一端部(35)固定于所述导风筒(1)的内壁，所述第二端部(36)与所述第一端部(35)相对，所述前缘(34)背离所述扩压部(2)开口的方向，所述尾缘(33)朝向所述扩压部(2)开口的方向，所述导叶(3)朝向所述扩压部(2)的面为压力面(31)，所述导叶(3)背离所述扩压部(2)的面为吸力面(32)；
    防护网(4)，所述防护网(4)包括多个沿所述导风筒(1)的径向分布的拼接圆环，每个所述拼接圆环包括多个圆弧段(41)，每个所述圆弧段(41)均连接于相邻两个导叶(3)之间；
    其中，每个圆弧段(41)的第一端固定于其中一个所述导叶(3)的所述吸力面(32)靠近所述尾缘(33)的位置处，每个圆弧段(41)的第二端固定于相邻导叶(3)的所述压力面(31)靠近所述前缘(34)的位置处。
  2. 根据权利要求1所述的轴流风机的导风圈，其中，所述圆弧段(41)沿所述导风筒(1)轴向的厚度不超过所述导叶(3)沿所述导风筒(1)轴向的厚度的四分之一。
  3. 根据权利要求2所述的轴流风机的导风圈，其中，在所述扩压部(2)开口的朝向上，所述导叶(3)的第一端部(35)的最高点低于所述导叶(3)的第二端部(36)的最高点。
  4. 根据权利要求3所述的轴流风机的导风圈，其中，所述导叶(3)包括相互连接的平直段和弯折段，所述平直段的一端为所述第二端部(36)，所述弯折段向远离所述扩压部(2)开口方向弯折，且所述弯折段的一端为所述第一端部(35)。
  5. 根据权利要求4所述的轴流风机的导风圈，其中，所述平直段与所述弯折段在径向上的长度比例为3:1-1:1。
  6. 根据权利要求1-5任一所述的轴流风机的导风圈，其中，所述扩压部(2)的侧壁沿纵向的截面形状为直线、弧线、曲线或多段拼接的弧线。
  7. 根据权利要求1-5任一所述的轴流风机的导风圈，其中，所述导风筒(1)的中心设有固定部(5)，所述多个导叶(3)的所述第二端部(36)沿周向固 定于所述固定部(5)。
  8. 根据权利要求1-7任一所述的轴流风机的导风圈，其中，所述导叶(3)的数量至少有11个。
  9. 根据权利要求7所述的轴流风机的导风圈，其中，所述导风筒(1)、所述扩压部(2)、所述多个导叶(3)、所述防护网(4)及所述固定部(5)一体成型。
  10. 一种轴流风机，包括如权利要求1-9任一所述的轴流风机的导风圈。
PCT/CN2021/114953 2020-09-25 2021-08-27 轴流风机的导风圈及轴流风机 WO2022062832A1 (zh)

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