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Axial flow blower

An axial fan and shaft technology, which is applied in mechanical equipment, machines/engines, liquid fuel engines, etc., can solve the problems of increased noise, discontinuous segmentation, etc., and achieve the effect of low noise

Active Publication Date: 2013-06-05
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, in the prior art of Patent Document 1, a serrated protrusion with a sharp front end is added to the entire leading edge portion, thereby discontinuously dividing the airflow flowing into the leading edge of the blade, so there is a possibility of turbulence. The problem of increased noise due to flow

Method used

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Experimental program
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Embodiment approach 1

[0029] Figure 1 ~ Figure 3 It is a figure for demonstrating the axial flow fan concerning Embodiment 1 of this invention. Specifically, figure 1 It is a perspective view of an axial flow fan according to Embodiment 1 of the present invention, figure 2 It is a front view of the axial fan according to Embodiment 1 of the present invention, image 3 It is a figure which schematically shows the flow field in the vicinity of the leading edge of the blade|wing of the axial flow fan of this invention. in addition, Figure 9 It is a figure which schematically shows the flow field near the leading edge of the blade of the conventional axial flow fan.

[0030] Such as Figure 1 ~ Figure 2 As shown, the axial flow fan of the present invention includes an impeller 1 having: a hub 2 rotating around an axis; Each wing 3 is surrounded by a leading edge 31 , a trailing edge 32 , an inner peripheral end 33 and an outer peripheral end 34 . Further, the front edge 31 of the blade 3 has...

Embodiment approach 2

[0037] In order to achieve further reduction of noise, it is preferable to adopt the following structure. Figure 4 and Figure 5 It is a figure for demonstrating the axial flow fan concerning Embodiment 2 of this invention. Specifically, Figure 4 It is a front view of an axial flow fan according to Embodiment 2 of the present invention, Figure 5 It is a figure which schematically shows the form and flow field of the bell mouth of the axial flow fan concerning Embodiment 2 of this invention.

[0038] Such as Figure 4 As shown, regarding the apex 311 of the convex portion of the leading edge 31 of the corrugated blade 3, when the distance between the apexes 311 of adjacent convex portions is L, the distance L becomes larger as it gets closer to the outer peripheral side of the blade 3. constituted in a manner. In addition, although description is omitted in Embodiment 1, as in Figure 5 As shown, the axial flow fan is usually provided with a bell mouth 5 on the outside...

Embodiment approach 3

[0041] As another means of achieving further noise reduction, the following configurations are preferably employed. Image 6 and Figure 7 It is a figure for demonstrating the axial flow fan concerning Embodiment 3 of this invention. Specifically, Image 6 It is a front view of an axial flow fan according to Embodiment 3 of the present invention, Figure 7It is a figure which schematically shows the form and flow field of the bell mouth of the axial flow fan concerning Embodiment 3 of this invention.

[0042] Such as Image 6 As shown, regarding the apex 311 of the convex portion of the leading edge 31 of the wave-shaped wing 3, when the distance between the apexes 311 of adjacent convex portions is L, according to the radial direction distribution of the range of the upstream turbulent vortex 4 Determine the distance L. Additionally, if Figure 7 As shown, on the outer side of the impeller 1 , a bell mouth 5 is provided so as to surround the impeller 1 with a slight gap...

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Abstract

Provided is an impeller having a boss (2) which rotates around an axial center and a plurality of wings (3) which are provided on an outer circumferential portion of the boss (2), and a front rim (31) of the wing (3) has a smooth wave form continuously having an uneven portion in a radial direction. A pitch distance L between tips (311) of projected portions of the wave form which are adjacent to each other is increased toward the outer circumference side or is determined so as to be correlated with a distribution in the radial direction of a scale of an upstream turbulent eddy. With this structure, the upstream turbulent eddy which generates when airflow enters the wings is separated so that a length in the radial direction becomes shorter, the upstream turbulent eddy is made to be random, the development of the eddy is suppressed, and sharp discontinuity of the flow is prevented even when the eddy is separated, with the result that a noise can be reduced.

Description

technical field [0001] The present invention relates to an axial fan used in, for example, an air conditioner or a ventilator. Background technique [0002] For conventional axial flow fans, use Figure 8 Be explained. Figure 8 It is a front view of a conventional axial flow fan. The axial flow fan includes an impeller 1 including: a hub 2 rotating around an axis; and a plurality of blades 3 arranged on the outer periphery of the hub 2 . Each wing 3 is surrounded by a leading edge 31 , a trailing edge 32 , an inner peripheral end 33 and an outer peripheral end 34 . [0003] In addition, conventionally, the following techniques are known as techniques for reducing the noise of an axial flow fan. That is, a plurality of zigzag triangular protrusions are added along the chord direction to the entire leading edge of the blade to form a longitudinal vortex by dividing the intake air, thereby suppressing the separation of the intake air on the entire leading edge and allowing t...

Claims

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Application Information

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IPC IPC(8): F04D29/38F04D29/66
CPCF04D29/384F05D2240/303
Inventor 中岛诚治新井俊胜森淳菊地仁青木普道柴田启子
Owner MITSUBISHI ELECTRIC CORP