JPH01310197A - Motor driven blower - Google Patents

Abstract

PURPOSE:To make small the resistance of air generating at the time of high speed revolution of an impeller, thereby lessening the loss of motive power by rounding the corner portions of a caulking portion projecting from a main plate and a side plate. CONSTITUTION:A centrifugal impeller 1 is made up of a circular main plate 2, an annular side plate 3 at whose center an air blowing-in opening portion 3a is formed, and a plurality of blades 4 arranged in a spiral shape between these main plate 2 and side plate 3. And the corner portions of the caulking portion projecting from the main plate 2 and the side plate 3 are formed roundly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric blower used in a vacuum cleaner or the like.

BACKGROUND OF THE INVENTION Usually, as shown in FIG. 5, this type of electric blower includes a casing 21, a commutator motor 22 disposed inside the casing 21, and a rotating shaft 23 of the motor 22. A centrifugal impeller 24, a cover 25 of the impeller 24 having an air suction port 25a formed in the center, and a cover 25 of the impeller 24 disposed between the impeller 24 and the casing z1 to guide the air sucked by the impeller 24 toward the motor 22. It is composed of an air guide 26. In the above configuration, the air discharged from the impeller 24 is transferred to the air guide 2
The air enters the differential user section 26a of No. 6, where the pressure is restored, enters the casing 21, cools the inside of the motor 22, and is discharged to the outside from the outlet 21a. By the way, conventionally, the impeller 24 has a circular main plate (also referred to as a rear shroud) 27 and a suction opening 28 in the center.
Side plate (also called front shroud) 2 where a is formed
8, and a plurality of blades 29 arranged spirally between the main plate 27 and the side plate 28, and the blades 2
9, the main plate 27, and the side plates 28 were integrated with each other by a caulking structure. That is, a rectangular caulking protrusion 30 is formed at a predetermined position on the end edge surface of the blade 29, and after this caulking protrusion 30 is inserted into the hole formed in the main plate 27 and the side plate 28, the sixth As shown in the figure, the protruding portions of the caulking projections 30 were crushed and integrated with each other.

Problems to be Solved by the Invention According to the above-mentioned conventional structure, the caulking protrusion 30 has a square shape and the caulking method is simply to crush it from above, so that the shape after caulking is also a square shape.

Therefore, when the impeller 24 rotates, it disturbs the air flow inside the blower, that is, inside the cover 25, and prevents the smooth flow of the intake air to the air guide 26. At the same time, large air resistance acts on the impeller 24, resulting in power loss. In addition, there was a problem that the noise caused by wind noise was high. In particular, this effect is significant when attempting to increase the speed of rotation due to the miniaturization of blowers in recent years.

Therefore, an object of the present invention is to provide an electric blower that can solve the above problems.

Means for Solving the Problems In order to solve the above-mentioned problems, the electric blower of the present invention has a centrifugal impeller driven by a motor and consisting of five main blades and a side plate. The caulking projections are inserted into holes formed in the main plate and the side plates and are integrated by tightening, and the corners of the caulked parts protruding from the main plate and side plates are rounded.

Effects According to the above configuration, the corners of the caulked portions protruding from the main plate and side plates are rounded, so air resistance generated when the impeller rotates at high speed becomes extremely small.

EXAMPLE Hereinafter, an example of the present invention will be explained based on FIGS. 1 to 4.

Since the gist of the present invention is a centrifugal impeller, the impeller will be explained in this embodiment, and the other configurations are the same as those explained in the conventional example, so the explanation thereof will be omitted.

As shown in FIGS. 1 and 2, a centrifugal impeller 1 according to the present invention includes a circular main plate 2, an annular side plate 3 in which an air suction opening 3a is formed in the center, and these main plates 2. and a plurality of blades 4 spirally arranged between the side plate 3 and the side plate 3.

These are connected to each other by a caulking structure. That is, as shown in FIG. 3, a plurality of caulking protrusions 5 each having a pair of front and rear square-shaped protrusions 5a and 5b are provided on the upper and lower end edges of each blade 4, and
The main plate 2 and side plate 3 corresponding to these projections 5 are formed with holes 6 and 7 through which the projections 5 can be inserted. and 1
Connect each protrusion 5 on the blade 4 side to the holes 6 and 7 in the main plate 2 and side plate 3.
After the blades 4 are inserted through the holes 6 and 7, the protrusions 5a and 5b of the protrusions 5 protruding from the holes 6 and 7 are crushed to integrate the blade 4 with the main plate 2 and side plate 3. and,
As shown in FIG. 4, a protrusion 5a protrudes from the hole 6°7.
, 5b, the corners are rounded so that the protrusions 5a, 5b have a smooth semicircular shape.

Therefore, in the above configuration, when the impeller 1 is rotated by the motor 11, air is transferred to the suction port 12 of the cover 12.
After entering the impeller 1 from a, the air passes through the differential user part 13a of the air guide 13 and enters the inside of the casing 14.

Then, after cooling the motor 11.

It is discharged to the outside from the discharge port 14a. By the way, when the impeller 1 rotates at high speed, the caulked parts protruding from the main plate 2 and side plates 3 disturb the air flow inside the blower, that is, inside the cover 12, and generate air resistance, resulting in power loss. However, the protrusion 5 which is the caulking part
Since a and 5b are rounded in a semicircular shape, air resistance is reduced, the air flow is less turbulent, power loss is reduced, and wind noise is eliminated, resulting in lower noise.

Effects of the Invention According to the above configuration of the present invention, the corners of the caulked portions protruding from the main plate and side plates are rounded, so the air resistance generated during high-speed rotation of the impeller is smaller than that of conventional square-shaped impellers. It is possible to reduce turbulence in the airflow within the vehicle, reduce power loss, and furthermore eliminate wind noise, thereby reducing noise.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view of an electric blower according to an embodiment of the present invention, Fig. 2 is a sectional view of the impeller, Fig. 3 is a side view of the impeller, and Fig. 4 is a perspective view of the caulking part. 5 is a partially cutaway side view of a conventional electric blower, and FIG. 6 is a perspective view of the caulking portion of the impeller. 1... Impeller, 2... Main plate, 3... Side plate, 4...
...Blade, 5...Protrusion, 5a, 5b...Protrusion, 6,
7... Anabe 6 Agent Yoshihiro Morimoto Figure 1 L--A) 6 Guu 2-Kamisama 3...-I Rule I and 4-Kan 4 艮 5-Sora S Figure 2 6," 7-Q section Figure 3 Figure 4 Figure 6 3θ

Claims (1)

[Claims] 1. A centrifugal impeller driven by a motor and consisting of a main plate, blades, and side plates is crimped by inserting square crimping protrusions provided on the blade side into holes formed in the main plate and side plates. The electric blower is integrated with the main plate and the side plates, and has rounded corners of the caulked parts that protrude from the main plate and the side plates.