JPH0291500A - Impeller for motor fan - Google Patents

Abstract

PURPOSE:To obtain a motor fan having the high blowing efficiency by inclining the shape of the tip surface of projections for caulking along the shape of a front shroud. CONSTITUTION:The shape of the tip surface of multiple projections 15 for caulking formed on the upper side of a blade 14 are inclined along the shape of a front shroud 12. Since the caulking force F applied to the projections for caulking is decomposed to the component Fy of the caulking force in vertical direction to the front shroud 12 and the component Fx of the caulking force in horizontal direction and is transmitted, the projections 15 are evenly spread to both the high position side and the low position side of the front shroud 12 by the work of the component Fx of the caulking force in horizontal direction. Consequently, the front shroud 12 and the blade 14 are securely caulked so as to reduce the gap between the both and the flow by the leakage can be restrained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an impeller used in an electric blower.

2. Description of the Related Art A conventional impeller 1 of this type of electric blower is constructed as shown in FIG. That is, a plurality of arcuately curved blades 4 are arranged between a front shroud 2 which is made of sheet metal and has an umbrella-shaped curved surface, and a flat rear shroud 3.
were installed, and these were swaged together. The caulking part has protrusions 6 for caulking protruding from the upper and lower sides of the blade 4.

It is deformed after penetrating the rear surfaces 2 and 3.

Problems to be Solved by the Invention However, in the impeller 1 of the electric blower having such a configuration, the shape of the front shroud 2 has an umbrella-shaped curved surface, and the tip of the caulking projection 6 is horizontal, so that the caulking force is low. 8, the deformed portion of the caulking protrusion 5 abuts the high side of the front shroud 2, resulting in insufficient caulking on the low side. Furthermore, if further caulking force is applied so that the deformed portion hits the lower side, the higher side of the front shroud 2 will be deformed. This causes the impeller 1 to have poor air blowing efficiency. However, in the past, the caulked portion was incomplete as shown in FIG. 8, and a gap 6 was created between the front shroud 2 and the blade 4, reducing efficiency.

The present invention solves the above-mentioned problems, and aims to provide an electric blower with high air blowing efficiency by devising the shape of the caulking protrusion of the inflator.

Means for Solving the Problems A technical means for solving the above problems is to make the shape of the tip surface of the caulking protrusion slope along the shape of the front shroud.

For production The effects of the above means are as follows.

By slanting the shape of the tip of the caulking protrusion to follow the shape of the front shroud, a portion of the caulking force acts along the shape of the front shroud, allowing the caulking protrusion to conform to the shape of the shroud. It can be uniformly deformed along the line.

Therefore, the shroud and the blades can be firmly caulked, resulting in a small gap and suppressing the flow of leakage seen in conventional systems, thereby improving the efficiency of the stain dynamic blower. .

Example Embodiments of the present invention will be described below with reference to the drawings.

1 to 4, the impeller 11 includes an umbrella-shaped front shroud 12 with a curved surface, a flat rear shroud 13, and a plurality of arcuately curved blades 14 disposed between them. It is formed by These front and rear shrouds 12, 13 and blades 14
are caulked and integrated by deforming caulking protrusions 16 protruding from the upper and lower sides of the blade 14.

By the way, the shape of the tip surface of the plurality of caulking protrusions 15 formed on the upper side of the blade 14 is similar to that of the front shroud 1.
It is inclined along the shape of 2.

Note that although the shape of the end face is approximately circular in this embodiment, the shape is not limited.

In the above configuration, as shown in FIGS. 5 and 6, the crimping force F applied to the crimping protrusion is applied to the front shroud 1.
2, the component force F in the direction perpendicular to the caulking force and the component force F in the horizontal direction are transmitted, so the component force F in the horizontal direction of the caulking force is transmitted! As a result, the caulking protrusions spread uniformly on both the high and low sides of the front shroud. Therefore, the front shroud 12 and the blade 14 can be firmly caulked, the gap between them can be reduced, and flow due to leakage can be suppressed.

Effects of the Invention As explained above, by slanting the shape of the tip of the caulking protrusion formed on the blade side along the shape of the front shroud, the caulking connection between the blade and the shroud is ensured. By making the gap between the shroud and the blades as small as possible, airflow caused by leakage is suppressed, and the efficiency of the electric blower can be improved.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of an impeller of an electric blower according to an embodiment of the present invention, Fig. 2 is a plan view, Fig. 3 is a side view of the blade, Fig. 4 is a top view, and Figs. 5 and 6 are FIG. 7 is a side sectional view of a conventional impeller, and FIG. 8 is a detailed sectional view of the caulking portion. 11... Impeller, 12... Group front shroud, 13... Rear shroud, 14... Old blade, 16... Protrusion for caulking. Name of agent: Patent attorney Shigetaka Awano and one other person

Claims (1)

[Claims] A plurality of blades having a plurality of caulking protrusions on each of the upper and lower sides are arranged between the front shroud and the rear shroud, and at least the tip surface of the upper caulking protrusion is inclined along the shape of the front shroud. , an electric blower impeller that integrates the front and rear shrouds and blades by deforming the caulking protrusions.