EP3872352A1

EP3872352A1 - Axial-flow impeller

Info

Publication number: EP3872352A1
Application number: EP20816374.1A
Authority: EP
Inventors: Jian Zou; James Pan; Warren Wang
Original assignee: Ebm Papst Ventilator Shanghai Co Ltd
Current assignee: Ebm Papst Ventilator Shanghai Co Ltd
Priority date: 2019-12-27
Filing date: 2020-07-07
Publication date: 2021-09-01
Also published as: WO2021128803A1; CN211259119U; EP3872352A4

Abstract

Provided is an axial flow impeller including a central hub and multiple blades. The central hub includes a base plate and a stacking sidewall disposed at an edge of the base plate. Multiple first convex portions are disposed at a first edge of the stacking sidewall extending axially, and a first concave portion is disposed between every two adjacent first convex portions. Multiple second convex portions are disposed at a second edge of the stacking sidewall extending axially, and a second concave portion is disposed between every two adjacent second convex portions. The first convex portions are in one-to-one correspondence with the second concave portions in the axial direction, and the first concave portions are in one-to-one correspondence with the second convex portions in the axial direction. The blades are disposed along an external surface of the stacking sidewall, and an edge of each of the multiple blades connected to the stacking sidewall extends from an edge of one of the multiple first convex portions to an edge of an adjacent second convex portion.

Description

The present application claims priority to Chinese Patent Application No. 201922403606.0 filed on December 27, 2019 , the disclosure of which is incorporated herein by reference in its entirety.

TECHNICAL FIELD

The present application relates to the technical field of axial flow fans, for example, to an axial flow impeller.

BACKGROUND

Fans are widely applied in factories, mines, tunnels, cooling towers, vehicles, ships, and buildings for ventilation, dust removal and cooling purposes, and are also used in air conditioning equipment and household appliances for cooling and ventilation purposes. Fans are machinery used for transporting gas. From the energy viewpoint, they are machines for converting mechanical energy of a prime mover into energy of the gas. Depending on the gas flow direction, fans may be divided into centrifugal fans, axial flow fans, diagonal flow fans, and cross-flow fans.
When an axial flow fan is operating, a power machine drives an impeller to rotate in a cylindrical housing. Gas enters from a current collector, gains energy through the impeller thus having increased pressure and speed, and then is discharged axially. The impeller is the main component of the fan, and its geometrical shape, size, number of blades and manufacturing accuracy have a great impact on the performance of the fan.
An impeller made by cold pressing aluminum alloy is typically used in the structural design and production of the axial flow fan. Such impellers however have low efficiency, high energy consumption and loud noise during operation of the fan.
In addition, such impellers are susceptible to deformation during transportation and use due to stack instability and are practically irreparable once deformation occurs. Although a same structure of plastic material may be used for replacement, the problems of low efficiency and loud noise are still not solved.

SUMMARY

The present application provides an axial flow impeller, which can solve the problems of loud noise and stack instability during transportation.
An axial flow impeller provided by an embodiment includes a central hub and a plurality of blades.
The central hub includes a base plate and a stacking sidewall. The stacking sidewall is disposed at an edge of the base plate, a plurality of first convex portions are disposed at a first edge of the stacking sidewall extending axially, a first concave portion is disposed between adjacent two of the plurality of first convex portions, a plurality of second convex portions are disposed at a second edge of the stacking sidewall extending in the axial direction, a second concave portion is disposed between adjacent two of the plurality of second convex portions, the plurality of first convex portions are in one-to-one correspondence with second concave portions in the axial direction, and first concave portions are in one-to-one correspondence with the plurality of second convex portions in the axial direction.
The plurality of blades are disposed along an external surface of the stacking sidewall, and an edge of each of the plurality of blades connecting to the stacking sidewall extends from an edge of one of the plurality of first convex portions to an edge of an adjacent second convex portion.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic view of an axial flow impeller at a viewing angle of the present application; and
FIG. 2 is a schematic view of an axial flow impeller at another viewing angle of the present application.

Reference Signs

1: central hub
2: blades
11: base plate
12: stacking sidewall
21: convex rib
22: reinforcing rib line
111: mounting portion
121: first convex portion
122: first concave portion
123: second convex portion
124: second concave portion

DETAILED DESCRIPTION

In the description of the present application, unless otherwise expressly specified and defined, the term "connected to each other", "connected" or "secured" is to be construed in a broad sense, for example, as securely connected, detachably connected, or integrated; mechanically connected or electrically connected; directly connected to each other or indirectly connected to each other via an intermediary; or internally connected between two elements or interactional relations between two elements. For those of ordinary skill in the art, specific meanings of the preceding terms in the present application may be understood based on specific situations.
In the present application, unless otherwise expressly specified and limited, when a first feature is described as "on" or "below" a second feature, the first feature and the second feature may be in direct contact or be in contact via another feature between the two features instead of being in direct contact. Moreover, when the first feature is described as "on", "above" or "over" the second feature, the first feature is right on, above or over the second feature or the first feature is obliquely on, above or over the second feature, or the first feature is simply at a higher level than the second feature. When the first feature is described as "under", "below" or "underneath" the second feature, the first feature is right under, below or underneath the second feature or the first feature is obliquely under, below or underneath the second feature, or the first feature is simply at a lower level than the second feature.
In the description of the present application, it should be noted that the orientations or position relations indicated by terms such as "above", "below", "left", "right", "vertical", "horizontal", "inside", "outside" and the like are based on orientations or position relations shown in the drawings. These orientations or position relations are intended only to facilitate and simplify description of the present application, and not to indicate or imply that a device or element referred to must have such specific orientations or must be configured or operated in such specific orientations. Thus, these orientations or position relations are not to be construed as limiting the present application. In addition, the terms "first" and "second" are used only to distinguish between descriptions and have no special meaning.
The present application provides an axial flow impeller, which may be used on a fan.
As illustrated in FIG. 1 and FIG. 2, the axial flow impeller includes a central hub 1 and a plurality of blades 2, and the plurality of blades 2 are disposed along a circumferential direction of the central hub 1.
The central hub 1 includes a base plate 11 and a stacking sidewall 12. The stacking sidewall 12 is disposed at an edge of the base plate 11, a plurality of first convex portions 121 are disposed at a first edge of the stacking sidewall 12 extending axially, a first concave portion 122 is disposed between adjacent two of the plurality of first convex portions 121, a plurality of second convex portions 123 are disposed at a second edge of the stacking sidewall 12 extending in the axial direction, a second concave portion 124 is disposed between adjacent two of the plurality of second convex portions 123, the plurality of first convex portions 121 are in one-to-one correspondence with second concave portions 124 in the axial direction, and first concave portions 122 are in one-to-one correspondence with the plurality of second convex portions 123 in the axial direction.
The central hub 1 is provided with a stacking sidewall 12 for stacking, a first edge of the stacking sidewall 12 extending in the axial direction can be axially engaged with a second edge of another stacking sidewall 12 extending in the axial direction, so that a stacking effect of two axial flow impellers is optimized, simultaneously, the weight of a single axial flow impeller is effectively reduced by 20%, and the transportation cost is reduced.
The plurality of blades 2 are disposed along an external surface of the stacking sidewall 12, and an edge of each of the plurality of blades 2 connecting to the stacking sidewall 12 extends from an edge of one of the plurality of first convex portions 121 to an edge of an adjacent second convex portion 123. The edge of each of the plurality of blades 2 connecting to the stacking sidewall 12 is limited between the first edge and second edge of the stacking sidewall 12, so that the plurality of blades 2 of an upper axial flow impeller do not interfere with the plurality of blades 2 of a lower axial flow impeller and the axial flow impellers are stacked better.
The base plate 11 includes a mounting portion 111 and an annular portion 112 disposed at an periphery of the mounting portion 111, the mounting portion 111 is provided with a mounting hole 1111, and a front surface of the annular portion 112 and a rear surface of the annular portion 112 are provided with support ribs. The mounting portion 111 is provided with a mounting hole 1111 to mount the axial flow impeller on a main body of the fan, and the annular portion 112 is provided with support ribs to improve the strength of the axial flow impeller.
The support ribs include a first support rib group 113 disposed on the front surface of the annular portion 112 and a second support rib group 114 disposed on the rear surface of the annular portion 112, and the first support rib group 113 and the second support rib group 114 are different in shape.
The first support rib group 113 and the second support rib group 114 respectively disposed on two surfaces of two sides of the annular portion 112 can improve the strength of the axial flow impeller, and the first support rib group 113 and the second support rib group 114 are of different shapes, so that the mounting surface of the axial flow impeller can be easily distinguished.
A plurality of first support ribs of the first support rib group 113 extend in a rotational direction, and heights of the plurality of first support ribs extending in the axial direction gradually increase from a first end close to the mounting portion 111 to a second end away from the mounting portion 111.
When the axial flow impeller rotates, the first support rib group 113 will generate centrifugal airflow, the efficiency of the airflow passing through the plurality of blades 2 is optimized, so that the effects of energy conservation and emission reduction are achieved, dust accumulated on the plurality of blades 2 can be taken away, the load increase caused by the accumulated dust is reduced, and the accumulation of dust and condensed water can be effectively prevented.
A plurality of second support ribs of the second support rib group 114 extend in a radial direction of the central hub 1, and heights of the plurality of second support ribs extending in the axial direction gradually increase from a first end close to the mounting portion 111 to a second end away from the mounting portion 111.
The second supporting ribs are linear, the first supporting ribs are curved, and the shapes of the second supporting ribs and the first supporting ribs are different, so that the installation surfaces for air suction and for air blowing of the axial flow impeller can be conveniently distinguished.
A plurality of convex ribs 21 parallel to each other are disposed at a first end of each of the plurality of blades 2 close to the central hub 1, and an angle is formed between an arrangement direction of the plurality of convex ribs 21 and the radial direction of the central hub 1.
The roots of the blades 2 are optimized, and the strength of the edges of the plurality of blades 2 with thin walls is increased.
In this embodiment, the length of the convex ribs 21 closer to the central hub 1 is smaller, that is, the convex ribs 21 parallel to each other gradually increase in a direction away from the central hub 1.
The plurality of convex ribs 21 and the second support rib group 114 are disposed on a same surface of each of the plurality of blades 2. At this time, the surface of each of the plurality of blades 2 provided with the plurality of convex ribs 21 and the second support rib group 114 serves as a positive pressure surface, and the surface of each of the plurality of blades 2 provided with the first support rib group 113 serves as a negative pressure surface.
Optionally, a reinforcing rib line 22 is disposed at a second end of each of the plurality of blades 2 away from the central hub 1. The reinforcing rib line 22 disposed can improve the strength of the plurality of blades 2.
Optionally, in this embodiment, reinforcing rib lines 22 are disposed on two surfaces of each of the plurality of blades 2.

Claims

An axial flow impeller, comprising:
a central hub (1), comprising a base plate (11) and a stacking sidewall (12) disposed at an edge of the base plate (11), wherein a first edge of the stacking sidewall (12) extending axially is provided with a plurality of first convex portions, and a first concave portion (122) is provided between every two adjacent first convex portions (121) of the plurality of first convex portions (121), wherein a second edge of the stacking sidewall (12) extending axially is provided with a plurality of second convex portions (123), and a second concave portion (124) is disposed between every two adjacent second convex portions (123) of the plurality of second convex portions (123), wherein the plurality of first convex portions (121) are in one-to-one correspondence with second concave portions (124) in the axial direction, and the first concave portions (122) are in one-to-one correspondence with the plurality of second convex portions (123) in the axial direction; and

a plurality of blades (2), disposed along an external surface of the stacking sidewall (12), and an edge of each of the plurality of blades (2) connecting to the stacking sidewall (12) extends from an edge of one of the plurality of first convex portions (121) to an edge of an adjacent second convex portion (123).
The axial flow impeller of claim 1, wherein the base plate (11) comprises a mounting portion (111) and an annular portion (112) disposed at a periphery of the mounting portion (111), wherein the mounting portion (111) is provided with a mounting hole (1111), and wherein a first and second surface of the annular portion (112) are provided with support ribs.
The axial flow impeller of claim 2, wherein the support ribs comprise a first support rib group (113) disposed on the first surface of the annular portion (112) and a second support rib group (114) disposed on the second surface of the annular portion (112), and wherein the first support rib group (113) and the second support rib group (114) are of different shapes.
The axial flow impeller of claim 3, wherein a plurality of first support ribs of the first support rib group (113) extend in a rotational direction, and heights of the plurality of first support ribs extending in the axial direction gradually increase from a first end close to the mounting portion (111) to a second end away from the mounting portion (111).
The axial flow impeller of claim 4, wherein a plurality of second support ribs of the second support rib group (114) extend in a radial direction of the central hub (1), and heights of the plurality of second support ribs extending in the axial direction gradually increase from a first end close to the mounting portion (111) to a second end away from the mounting portion (111).
The axial flow impeller of claim 5, wherein a first end of each of the plurality of blades (2) close to the central hub (1) is provided with a plurality of convex ribs (21) that run parallel to each other, and an angle is formed between a direction in which the plurality of convex ribs (21) are arranged and the radial direction of the central hub (1).
The axial flow impeller of claim 6, wherein the plurality of convex ribs (21) and the second support rib group (114) are disposed on a same surface of the plurality of blades (2).
The axial flow impeller of claim 7, wherein a reinforcing rib line (22) is disposed at an end of each of the plurality of blades (2) away from the central hub (1).