Axial fan for vehicles

Details Axial fan for vehicles Axial fan for vehicles

2002-10-07

2003-12-09

Verdier, Christopher (Department: 3745)

Fluid reaction surfaces (i.e., impellers)

Rotor having flow confining or deflecting web, shroud or...

Radially extending web or end plate

C416S202000, C416S22300B, C416S234000, C416S243000, C416S235000, C416S23600R, C123S041490

Reexamination Certificate

active

06659724

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
This application is based upon and claims priority of Japanese Patent Application No. 2001-31339, filed on Feb. 7, 2001, the contents being incorporated herein by reference, and a continuation of PCT/JP02/01048, filed Feb. 7. 2002.
TECHNICAL FIELD
The present invention relates to an axial fan, for vehicles, having a plurality of blades radially extending from a boss (hub).
BACKGROUND ART
A radiator, and a blower for blowing cold air onto the radiator, have usually been mounted on the portions where the air can be easily taken in, such as at the front end of the vehicle. Therefore, the blower is strongly affected by the air pressure caused by travelling of the vehicle.
Concretely speaking, the axial fan used for the blower is such that the air passes through in the axial direction. When the air pressure caused by travelling of the vehicle is received in the axial direction, therefore, the velocity differential becomes small between the surfaces of the blades and the air, and the resistance becomes small between the blade surfaces and the air.
In an idling condition in which the vehicle is at rest while the axial fan (blower) is in operation, on the other hand, the resistance is great between the blade surfaces and the air when there is almost no air pressure caused by travelling of the vehicle. On the root side of the blades
212
where the peripheral velocity is small, therefore, the air flow peels off the surfaces of the blades
212
and stalls. As shown in
FIG. 7
, therefore, the air that is blown fails to flow in the axial direction but flows in an outer radial direction.
As the air that is blown flows in the outer radial direction, the spatial size W
1
through which the air substantially flows becomes smaller than the spatial size Wo in which the air substantially flows when the air that is blown is flowing in the axial direction, resulting in a decrease in the blow rate and in the fan efficiency of the blower.
This phenomenon (problem) occurs particularly conspicuously when there exists a wall surface having a large air resistance, such as an engine, on the downstream side of the axial fan.
DISCLOSURE OF THE INVENTION
In view of the above-mentioned points, therefore, it is an object of the present invention to provide an axial fan for vehicles, which suppresses a drop in the flow rate that occurs when the air that is blown does not flow in the axial direction but flows in the outer radial direction.
In order to accomplish the above-mentioned object according to one aspect of the present invention, there is provided an axial fan
210
, having a plurality of blades
212
radially extending from a boss
211
to blow the air to a heat exchanger
100
mounted on the vehicle, wherein the axial end surface
211
a
of the boss
211
on the negative pressure side
212
of the blades
212
is so constituted that the air flows toward the root side of the blades
212
from the side of the axial end surface
211
a.
Due to the air flowing toward the root side of the blades
212
from the side of the axial end surface
211
a
, therefore, the resistance decreases between the air and the blade surfaces on the root side of the blades
212
, making it possible to prevent a stall on the root side of the blades
212
. It is, therefore, possible to effectively make the air on the front side of the boss
211
flow toward the outer direction (toward the blades
212
) and, hence, to suppress a drop in the flow rate.
According to another aspect of the present invention, there is provided an axial fan
210
, having a plurality of blades
212
radially extending from a boss
211
to blow the air to a heat exchanger
100
mounted on the vehicle, wherein the front edges
212
b
of the blades
212
are deviated toward the upstream side in the air stream beyond the axial end surface
211
a
at the axial end of the boss
211
as viewed from a direction at right angles to the axial direction of the boss
211
.
It is thus made possible for the air to flow from the side of the axial end surface
211
a
toward the root side of the blades
212
. Due to the air flowing toward the root side of the blades
212
from the side of the axial end surface
211
a
, therefore, the resistance decreases between the air and the blade surfaces on the root side of the blades
212
. It is, therefore, allowed to effectively guide the air on the front side of the boss
211
toward the outer direction (toward the blades
212
) and, hence, to suppress a drop in the flow rate.
The invention can be more fully understood from the accompanying drawings and from the description of preferred embodiments of the invention.


REFERENCES:
patent: 1473066 (1923-11-01), Wells
patent: 2238749 (1941-04-01), Peltier
patent: D131271 (1942-02-01), Collura
patent: 3727593 (1973-04-01), Enke
patent: 4568242 (1986-02-01), Susa et al.
patent: 5066196 (1991-11-01), Morofushi
patent: 6065936 (2000-05-01), Shingai et al.
patent: 6341940 (2002-01-01), Giribaldi
patent: 58-66000 (1983-04-01), None
patent: 60-73000 (1985-05-01), None
patent: 60-156998 (1985-08-01), None
patent: 3-110199 (1991-11-01), None
Search Report dated Aug. 15, 2002 from corresponding PCT Application No. PCT/JP02/01048.

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