JPH07180697A - Axial blower - Google Patents

Abstract

PURPOSE:To improve the cooling of a motor in an axial blower in which the motor for driving an impeller is located on the lee side of the impeller. CONSTITUTION:A motor 2 for driving an impeller 1 is located on the lee side of the impeller 1 and fitted into a wall hole or the like by a flange 4 through a stay 3. A taper pipe 10 smaller in diameter onto the lee side is located on the outside of the motor 2. The taper pipe 10 can be fastened to the stay 3 or can be fastened to another stay. Air at the central part of the impeller 1 is guided by the taper pipe 10 to cool the motor 2 desirably. The effect is great especially when static pressure applied to an axial blower is high and the air quantity is lowered to rotate the air 5 by that part so as to further increase the component of velocity outside in the radial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an axial blower in which an electric motor for driving an impeller is arranged on the lee side of the impeller.

[0002]

2. Description of the Related Art FIG. 3 is a side view of a conventional example, and FIG. 4 is Q of FIG.
FIG. In the figure, an electric motor 2 for driving an impeller 1 is arranged on the lee side of the impeller 1, and the electric motor 2 is attached to a wall hole or the like with a flange 4 via a stay 3.

[0003]

In the above-mentioned conventional example, the wind 5 exiting the impeller 1 has a radial partial velocity in addition to the axial partial velocity, so that the electric motor 2 is not cooled well. In particular,
If the static pressure applied to the axial blower is large, the air volume will decrease and
Is rotated by that much, the partial velocity on the outside in the radial direction is further increased, and the cooling of the electric motor 2 is further deteriorated. For this reason,
The electric motor 2 is made large and the static pressure used is limited.

An object of the present invention is to provide an axial blower in which an electric motor for driving an impeller is arranged on the lee side of the impeller, which can improve cooling of the electric motor.

[0005]

In the axial flow fan of the present invention, an electric motor for driving an impeller is arranged on the lee side of the impeller,
A taper pipe having a small diameter is arranged on the outside of the electric motor in the leeward direction.

[0006]

According to this structure, the wind at the center of the impeller is guided by the tapered tube to cool the electric motor well. In particular, when the static pressure applied to the axial blower is large, the air volume is reduced, the wind is rotated by that amount, and the cooling action is secured when the partial velocity on the radially outer side is further increased.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a side view of the embodiment, and FIG. 2 is a view on arrow P of FIG. In the conventional example and each drawing, those having the same reference numerals have approximately the same function. In the figure, an electric motor 2 for driving an impeller 1 is arranged on the lee side of the impeller 1, and the electric motor 2 is attached to a wall hole or the like with a flange 4 via a stay 3. A feature of the embodiment is that the taper pipe 1 having a small diameter in the leeward direction.
0 is arranged outside the electric motor 2. The taper tube 10 may be fixed to the stay 3 or may be fixed to another stay.

According to this structure, the wind 11 at the center of the impeller 1 is guided by the taper tube 10 to cool the electric motor 2 well. In particular, the effect is great when the static pressure applied to the axial blower is large, the air volume is reduced, the wind 5 is rotated by that amount, and the radial outside velocity is further increased.

[0009]

In the axial blower of the present invention, the electric motor for driving the impeller is arranged on the lee side of the impeller, and the taper pipe having a small diameter is arranged on the outer side of the electric motor. The wind is guided by the taper pipe and has the effect of cooling the electric motor well. In particular, there is an effect that the cooling action is secured when the static pressure applied to the axial blower is large, the air volume is reduced, the wind is rotated by that amount, and the radial outside velocity is further increased.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment.

FIG. 2 is a view on arrow P of FIG.

FIG. 3 is a side view of a conventional example.

FIG. 4 is a view on arrow Q in FIG.

[Explanation of symbols]

 1 impeller 2 electric motor 3 stay 4 flange 5 wind 10 taper pipe 11 wind

Claims (1)

[Claims] 1. An axial-flow blower characterized in that an electric motor for driving an impeller is arranged on the leeward side of the impeller, and a taper pipe having a small diameter is arranged on the outer side of the electric motor on the leeward side.