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Air blower

a technology of air blower and air flow, which is applied in the direction of rotors, marine propulsion, vessel construction, etc., can solve the problems of air flow, inability to achieve sufficient noise reduction effect, and the blade cannot suitably deal with changes, so as to prevent the drop in air flow and effectively reduce the noise of the fan

Inactive Publication Date: 2015-06-04
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is a blower with blades that have serrations on their leading edge that change in pitch, height, or direction based on the air flow. The serrations are made up of triangles that stick out from the blade. The front of the blade has a first distance from the center of rotation, and the back of the blade has a second distance from the center of rotation. The front of the blade has slanted sides with serrations that face in one direction, while the back of the blade has slanted sides with serrations that face in a different direction. The distance between the blade and the center of rotation is different at the front and back of the blade. This design helps the blower to improve its performance.

Problems solved by technology

In such a prior art as PLT 1, serrations which were provided with a blade could not sufficiently suitably deal with changes in the flow of air depending on the portion of the blade and a sufficient noise reduction effect sometimes could not be obtained.
Further, a drop in the air flow was sometimes caused or the drive torque increased and a drop in efficiency was caused.

Method used

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Experimental program
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first embodiment

[0025]Referring to FIG. 1, a blower 10 is a so-called electric blower comprising a blower fan 1 which is placed in a shroud 200 and which is driven to rotate by a drive motor (electric motor) 300. The blower 10 is fastened to an engine side of an automobile radiator by mounts 250 which are provided near the four corners of the shroud 200 and blows air for cooling use to the core part of the radiator. The outside shape of the shroud 200 forms a rectangular shape corresponding to the core part of the radiator. At the approximate center, a ring-shaped shroud ring part 210 is formed so as to encircle the blower fan 1 by its outer circumference. This shroud ring part 210 is provided at the shroud 200 so as to be positioned at the outside of the ring 2 of the blower fan 1 in the radial direction. There may also be no ring 2 of the blower fan 1 in the present embodiment. The blower 10 and the later explained blades 3 of the present invention are not limited to use for an automobile radiato...

second and third embodiments

[0031]The second and third embodiments are embodiments corresponding to the case where the air near a blade surface of the blower flows in the circumferential direction of the blower fan. The second embodiment, as shown in FIG. 7, is characterized in that the further to the blade outside diameter side the blade is, the larger the sizes of the serrations are made. The serrations are directed toward the circumferential direction of the blower fan. According to this, the size of the serrations is increased at the portion with a large flow rate at the blade outer circumference side, and the whirled air flow which is formed at the serrations, becomes weaker at a portion further toward the blade inside circumference side and becomes stronger at a portion further toward the blade outer circumference side. Due to this, at the flow with a high flow rate where flow separation would easily occur, it is possible to form a downward flow toward the blade surface and reduce the flow separation to ...

fourth embodiment

[0033]The fourth embodiment, as seen in FIG. 9, is characterized in that the blade trailing edge 7 is also provided with serrations and in that the blade leading edge 6 and blade trailing edge 7 are changed in serration shapes. When the blade trailing edge 7 is provided with serrations, since the flow at the high pressure blade positive pressure surface and the flow at the low pressure blade negative pressure surface are mixed near the blade trailing edge, the flows of the two surfaces gradually cross due to the serrations, so it is possible to suppress the disturbances in the flow of air of the blade trailing edge. The blade leading edge 6 and the blade trailing edge 7 may be suitably set with serration shapes. If the blade trailing edge 7 is made smaller in size of serrations compared with the blade leading edge 6, the serrations at the blade leading edge side, which are provided for suppressing flow separation, can be made larger so as to form a radiated flow. On the other hand, ...

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PUM

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Abstract

An air blower is provided with a drive motor and an air blowing fan which has a hub mounted to the drive motor and blades which are provided to the hub. The air blower is characterized in that serrations comprising triangle-shaped protrusions are provided to the front edge of each of the blades so as to be arranged along the front edge and in that the pitch, the height, or the direction of the serrations is changed according to the flow of air at a radial position on the air blowing fan.

Description

TECHNICAL FIELD[0001]The present invention relates to an axial flow blower, centrifugal blower, diagonal flow blower, etc., more particularly relates to a structure of a fan blade which can suppress disturbances in the air flow and reduce noise.BACKGROUND ART[0002]Better blower performance and lower noise are being sought from axial flow blowers etc. PLT 1 discloses providing a plurality of triangular shape projections in a sawtooth manner (hereinafter referred to as “serrations”) in a chord line direction with an all leading edge part of each blade to reduce the noise of rotation due to the blower fan.[0003]In general, the flow of air near a blade surface of a blower greatly differs depending on the part. The further to the outer circumference side in the radial direction of the blower fan the blower fan is, the higher the flow rate is. Further, the direction of the air flow at the outer circumference side of the blower fan, with respect to the direction of rotation, greatly change...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F04D27/00F04D19/00
CPCF04D19/002F04D27/002F04D29/30F04D29/326F04D29/384F04D29/667F04D29/681F05D2240/303
Inventor KAMIYA, MASARUOOYA, HIDEKIYOSHIDA
Owner DENSO CORP
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