CN112032110A - Axial fan's wind-guiding circle and axial fan - Google Patents

Abstract

The invention belongs to the technical field of fans, and discloses an air guide ring of an axial flow fan and the axial flow fan, which comprise an air guide cylinder; one end of the air duct extends outwards to form a diffuser; the guide vanes are uniformly distributed in the air guide cylinder along the circumferential direction, and one end of each guide vane is fixed on the inner wall of the air guide cylinder; the protection network includes a plurality of concatenation rings along the radial distribution of guide duct, and every concatenation ring includes a plurality of circular arc sections, and every circular arc section all connects between two adjacent stator, and the circular arc section is the slope in the wind-guiding circle axial and arranges. The protection network of the integrated circular arc section of stator, the circular arc section is the slope distribution in wind-guiding circle axial direction, and radial a plurality of circular arc sections are the ladder distribution, and the time that the impeller wake strikes the protection network front end can stagger, can reduce axial fan's noise. One end of the guide vane is fixed in the air duct, and is not connected with the diffuser of the air guide ring, so that the shape of the diffuser is not damaged, the diffuser can recover kinetic energy and reduce flow velocity, static pressure and efficiency are increased, and noise generated when the wake of the impeller impacts the guide vane and a protective screen is reduced.

Description

An air guide ring of an axial flow fan and an axial flow fan

technical field

The invention relates to the technical field of fans, in particular to an air guide ring of an axial flow fan and an axial flow fan.

Background technique

In order to prevent the impeller from colliding with foreign objects, 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, improving the axial flow fan. production cost. In order to solve the above problems, an annular integrated protective net is usually integrated into the guide vane of the axial flow fan. However, due to the limitation of the demoulding technology, 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.

In addition, in order to increase the efficiency of the axial flow fan, as well as the air volume and wind pressure, and reduce the noise caused by the airflow hitting the guide vanes and the protective net, 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.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an air guide ring of an axial flow fan and an axial flow fan, which can reduce the noise when the axial flow fan is working, and also improve the efficiency of the axial flow fan, as well as the air volume and wind pressure.

In order to achieve this purpose, on the one hand, the present invention provides an air guide ring for an axial flow fan, including:

air guide;

a diffuser, extending outward from one end of the air guide tube;

A plurality of guide vanes are evenly distributed in the air guide tube along the circumferential direction, the guide vanes include 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;

One end of the arc segment is fixed at the position where the suction surface of one of the guide vanes is close to the trailing edge, and the other end of the arc segment is fixed on the pressure surface of the other guide vane near the leading edge.

Preferably, the thickness of the arc segment along the axial direction of the air guide tube does not exceed a quarter of the thickness of the guide vane along the axial direction of the air guide tube.

Preferably, in the direction of the opening of the diffuser, the highest point of the first end portion is lower than the highest point of the second end portion.

Preferably, the guide vane includes a straight section and a bent section that are connected to each other, one end of the straight section is the second end, and the bent section is bent in a direction away from the opening of the diffuser section And one end of the bending section is the first end.

Preferably, the length ratio of the straight section to the bent section in the radial direction is 3:1-1:1.

Preferably, the cross-sectional shape of the side wall of the diffuser portion along the longitudinal direction is a straight line, an arc, a curve or a multi-segmented arc.

Preferably, the center of the air guide tube is provided with a fixing portion, and the second end portions of the plurality of guide vanes are fixed to the fixing portion along the circumferential direction.

Preferably, the number of the guide vanes is at least 11.

Preferably, the air guide tube, the diffuser portion, the guide vane, the protective net and the fixing portion are integrally formed.

In another aspect, the present invention provides an axial flow fan, comprising the aforementioned wind guide ring of the axial flow fan.

Beneficial effects of the present invention: the wind guide ring and the axial flow fan of the axial flow fan provided by the present invention integrate the protective net of the arc segment on the guide vane of the air guide ring, and the two ends of the arc segment are respectively fixed to the phase The suction surface of the two adjacent guide vanes is close to the trailing edge and the pressure surface is close to the leading edge, so that the protective net of the arc segment can be distributed obliquely in the axial direction of the wind guide ring, and there are multiple arcs in the radial direction. The sections are distributed in steps, and the time when the impeller wake hits the front end of the protective net will be staggered, which can reduce the noise of the axial flow fan. In addition, the first end of the guide vane is fixed in the air guide tube without being connected with the diffuser part of the air guide ring, so that the shape of the diffuser part can not be damaged, and the kinetic energy can be recovered to increase the static pressure and efficiency of the axial flow fan , reduce the flow rate of the airflow through the diffuser, and further reduce the noise generated by the airflow hitting the guide vanes and the protective net.

Description of drawings

Fig. 1 is the schematic diagram of the air guide ring of the axial flow fan of the present invention;

2 is a schematic cross-sectional view of the air guide ring of the axial flow fan of the present invention.

In the figure: 1, air guide tube; 2, diffuser; 3, guide vane; 31, pressure surface; 32, suction surface; 4, protective net; 41, arc segment; 5, fixed part.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, the drawings only show some but not all structures related to the present invention.

In the description of the present invention, unless otherwise expressly specified and limited, the terms "connected", "connected" and "fixed" 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. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, 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.

In the description of this embodiment, the terms "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the accompanying drawings, which are only for convenience of description and simplified operation, rather than indicating Or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first" and "second" are only used for distinction in description, and have no special meaning.

The present invention provides an air guide ring for an axial flow fan and an axial flow fan, the air guide ring is suitable for an axial flow fan, and 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 two-part structure improves the static pressure and efficiency of the axial flow fan, and further reduces the noise generated by the airflow hitting the guide vanes 3 and the protective net 4. The structure of the air guide ring of the axial flow fan and the axial flow fan of the present invention will be described below with specific embodiments.

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, which is used 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 used to reduce the flow rate of the airflow and reduce the impact of the airflow. The noise generated by the guide vanes 3 and the protective net 4. One end of the guide vane 3 is fixed on the inner wall of the air guide tube 1 for recovering kinetic energy and converting it into potential energy, thereby improving 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. It is used to prevent the impeller of the axial flow fan from colliding with foreign objects.

In this embodiment, as shown in FIG. 1 , the center of the air guide tube 1 is provided with a fixing portion 5 , the second ends of the plurality of guide vanes 3 are fixed to the fixing portion 5 along the circumferential direction, and the fixing portion 5 is used for fixing the motor and the impeller.

In this embodiment, as shown in FIG. 2 , on the section passing through the axis of the air guide tube 1, 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.

In this embodiment, as shown in FIG. 1 and FIG. 2 , the guide vane 3 includes a first end, a second end, a leading edge and a trailing edge. The first end is fixed on the inner wall of the air guide tube 1 , and the second end is The front edge faces away from the opening direction of the diffuser part 2, the trailing edge faces the opening direction of the diffuser part 2, the surface of the guide vane 3 facing the diffuser part 2 is the pressure surface 31, and the guide vane 3 faces away from the diffuser part 2. The surface of the pressing part 2 is the suction surface 32, the first end of the guide vane 3 is fixed on the inner wall of the air guide tube 1, and the diffuser part 2 of the air guide ring is not connected, and the shape of the diffuser part 2 is not damaged, The static pressure and efficiency of the axial flow fan can be increased through the recovered kinetic energy, the flow rate 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 further reduced. Further, there are a plurality of guide vanes 3, and 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 to recover kinetic energy. Preferably, the number of guide vanes 3 is at least 11, which can ensure Guide vanes 3 recover kinetic energy for all airflow.

As a preferred technical solution, as shown in FIG. 2 , in the direction of the opening of the diffuser 2 , the highest point of the first end of the guide vane 3 is lower than the highest point of the second end, so that the fixed part 5 is in the axial direction. Approaching the end of the diffuser portion 2, the axial dimension of the axial flow fan can be reduced. In addition, when the axial dimension of the axial flow fan is determined, the highest point of the first end is lower than the highest point of the second end, and the first end is ensured on the inner wall of the air guide tube 1. Increase the distance between the impeller of the axial flow fan and part of the guide vanes 3 to reduce the noise generated by the airflow hitting the guide vanes 3 and the protective net 4 . Further, 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, the bent section is bent away from the opening of the diffuser 2, and one end of the bent section is the first end. At one end, the setting of the straight section can make some 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 The end is on the inner wall of the air guide tube 1 . Further, without affecting the function of the guide vane 3, the length ratio of the straight section and the bent section in the radial direction is 3:1-1:1. When the designed axial flow fan is noisy, it can be The ratio of the length of the straight section to the bent section in the radial direction is set to 3:1, which can increase the part of the guide vane 3 away from the impeller and reduce the noise. When the designed axial flow fan has low noise, the straight section can be The ratio of the length to the bending section in the radial direction is set to 1:1 to reduce the processing difficulty. It can be understood that, the length ratio of the straight section and the bent section in the radial direction may be any ratio of 3:1-1:1.

In this embodiment, one 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, and the other end of the arc segment 41 is fixed to the pressure surface of the other guide vane 3 The position of 31 close to the front edge can make the protective net 4 of the arc segment 41 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 time for the airflow to hit the front end of the protective net 4 will be staggered, reducing noise. Further, the thickness of the circular arc segment 41 along the axial direction of the air guide tube 1 does not exceed a quarter of the thickness of the guide vane 3 along the axial direction of the air guide tube 1. Under the condition of ensuring the air volume, it is convenient for the protection net 4 to be demolded, and It can reduce the use of materials and reduce costs.

Preferably, 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.

It can be seen from the above embodiments that the wind guide ring of the axial flow fan and the axial flow fan provided by the present invention 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 of the suction surface 32 fixed to the adjacent two guide vanes 3 near the trailing edge and the position of the pressure surface 31 near the leading edge can make the protective net 4 of the arc segment 41 inclined in the axial direction of the wind guide ring. , and the multiple arc segments 41 are distributed in steps in the radial direction, 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 of the guide vane 3 is fixed in the air guide tube 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 by the diffuser, which is further reduced. The noise generated by the airflow hitting the guide vane 3 and the protective net 4, in addition, by setting 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 further reduced. noise.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the embodiments of the present invention. For those of ordinary skill in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. There is no need and cannot be exhaustive of all implementations here. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. an air guide ring of an axial-flow fan, is characterized in that, comprises: Air deflector (1); The diffuser (2) extends outward from one end of the air guide tube (1); A plurality of guide vanes (3) are uniformly distributed in the air guide tube (1) along the circumferential direction, the guide vanes (3) include a first end, a second end, a leading edge and a trailing edge, the first The end is fixed on the inner wall of the air guide tube (1), the second end is opposite to the first end, the front edge is away from the direction of the opening of the diffuser (2), the tail The edge faces the opening direction of the diffuser (2), the surface of the guide vane (3) facing the diffuser (2) is the pressure surface (31), and the guide vane (3) faces away from the diffuser (2). The surface of the pressing part (2) is the suction surface (32); A protective net (4), the protective net (4) includes a plurality of splicing rings distributed along the radial direction of the air guide tube (1), and each of the splicing rings includes a plurality of arc segments (41) , each of said circular arc segments (41) is connected between two adjacent said guide vanes (3); One end of the circular arc segment (41) is fixed at a position where the suction surface (32) of one of the guide vanes (3) is close to the trailing edge, and the other end of the circular arc segment (41) is fixed At the position where the pressure surface (31) of the other guide vane (3) is close to the leading edge. 2 . The wind guide ring of an axial flow fan according to claim 1 , wherein the thickness of the circular arc segment ( 41 ) along the axial direction of the wind guide tube ( 1 ) does not exceed the guide vane ( 3 ). 3 . ) is a quarter of the thickness along the axial direction of the air guide tube (1). 3. The wind guide ring of an axial flow fan according to claim 2, characterized in that, in the direction of the opening of the diffuser (2), the highest point of the first end is lower than the second the highest point of the end. 4 . The wind guide ring of an axial flow fan according to claim 3 , wherein the guide vane ( 3 ) comprises a straight section and a bent section that are connected to each other, and one end of the straight section is the At the second end, the bending section is bent in a direction away from the opening of the diffuser (2), and one end of the bending section is the first end. 5 . The wind guide ring of an axial flow fan according to claim 4 , wherein the length ratio of the straight section and the bent section in the radial direction is 3:1-1:1. 6 . 6. The air guide ring of an axial flow fan according to any one of claims 1-5, characterized in that, the cross-sectional shape of the side wall of the diffuser (2) along the longitudinal direction is a straight line, an arc, a curve or multiple sections Stitched arcs. 7. The air guide ring of an axial flow fan according to any one of claims 1-5, wherein the center of the air guide tube (1) is provided with a fixed portion (5), and a plurality of the guide vanes ( The second end portion of 3) is fixed to the fixing portion (5) in the circumferential direction. 8. The wind guide ring of an axial flow fan according to any one of claims 1-7, wherein the number of the guide vanes (3) is at least 11. 9 . The air guide ring of an axial flow fan according to claim 7 , wherein the air guide tube ( 1 ), the diffuser portion ( 2 ), the guide vane ( 3 ), the protection The net (4) and the fixing part (5) are integrally formed. 10. An axial-flow fan, characterized in that it comprises an air guide ring of the axial-flow fan according to any one of claims 1-9.

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