JPH0378600A - Electric-powered blower - Google Patents

Abstract

PURPOSE:To improve intake performance and to reduce noises by providing a ring which smoothly leads an air flow turned by a diffuser to a ventilating port at a circular corner to which a motor frame and a fan cover is contacted, so as to vanish the air flow swirl at the corner portion. CONSTITUTION:An electric-powered blower 1 is provided with a ring 14 having a circular recess surface 15 which smoothly leads an air flow to a ventilating port 16, at a circular corner portion to which a motor frame 5 and a fan cover 11 are contacted. The air flow led from the slant passage 12 of a diffuser 7 is therefore turned along the recess surface 15 of the ring without the generation of swirls to be smoothly led to the ventilating port 16 of the motor frame 5. Consequently, intake performance is remarkably improved due to this electric- powered blower 1 and also noises become small thereby.

Description

[Detailed Description of the Invention] (a) Industrial Application Field The present invention relates to an electric blower used in a vacuum cleaner, etc. More specifically, the present invention relates to an electric blower used in a vacuum cleaner, etc. The second invention relates to an electric blower that discharges air to the outside.

(b) Prior Art Conventionally, electric blowers such as those shown in FIGS. 1θ to 13 have been known. In other words, an electric blower includes motors 2 and 3 attached to a disc-shaped motor frame 5 on the downstream side, and a fan 10 attached to the shaft 8 of the motors 2 and 3 on the upstream side of the motor frame 5. 21 are known.

Such an electric blower 2I is further provided with a disk-shaped diffuser 7 between the fan 1O and the motor frame 5 to change the direction of the airflow generated by the fan 10.

A fan cover 11 that covers the fan IO and the diffuser 7 is attached to the motor frame 5 concentrically. An air inlet is provided in the center of the fan cover 11.

Then, the airflow whose direction is changed by the diffuser 7 is
The motor 2 is connected to the motor 2 from the ventilation hole 16 provided in the motor frame 5.
・It is structured so that it can be guided inside 3.

In this electric blower 21, the airflow generated by the fan IO hits the fan cover 11 and is diverted obliquely toward the downstream side along the inclined passage 12 provided on the outer periphery of the diffuser 7. The motor frame 5 is guided by the guide wall 13 provided on the back side of the diffuser 7.
The air is discharged into the motors 2 and 3 from the ventilation port 16 of the motor.

(C) Problems to be Solved by the Invention In the electric blower 21 described above, the motor frame 5 and the fan cover 1
There is an angular corner portion 18 at the point where 1 touches. In this corner portion 18, the airflow generates eddies and becomes turbulent, which poses a problem in that not only the suction performance of the electric blower 21 is poor, but also the noise is large.

This invention was made in view of the above-mentioned circumstances, and the technical problem is to improve suction performance and reduce noise in an electric blower by eliminating the vortices of airflow generated at the corner portions. shall be.

(d) Means for Solving the Problems and Their Effects In this invention, a diffuser is disposed between a fan and a motor frame, the direction of the airflow generated by the fan is changed by the diffuser, and the airflow is disposed on the motor frame. In an electric blower that guides the inside of the motor from the ventilation hole,
A ring is provided at the circumferential corner where the motor frame and the fan cover are in contact, which has an arcuate concave surface and can smoothly guide the airflow whose direction is changed by the diffuser to the ventilation hole. This is an electric blower.

That is, the electric blower of the present invention is characterized in that a ring having an arcuate concave surface is provided at the circumferential corner where the motor frame and the fan cover are in contact to smoothly guide airflow to the ventilation opening.

Here, as the ring, one made of a plastic material or the like is used. Then, this ring is welded, for example, by ultrasonic welding to the downstream peripheral edge of the diffuser or the upstream corner where the motor frame and the fan cover are in contact.

Thus, the airflow directed from the sloping passage of the diffuser is redirected without creating vortices along the concave surface of the ring and is smoothly guided to the ventilation opening of the motor frame.

(e) Examples Examples of the present invention will be described below based on the drawings. Note that this invention is not limited to this.

In FIGS. 1 to 8, the electric blower 1 is roughly divided into an electric motor part and a blower part. The electric motor section further includes a rotor assembly section 2, a stator assembly section 3, a bracket 4, and a motor frame 5. The blower section further includes a diffuser 7 fixed to the front surface of the motor frame 5 with screws 6, a fan IO1 fastened to the shaft 8 of the rotor assembly section 2 with nuts 9, and a fan cover II that covers the outside of the fan 10. .

I2 is an inclined passage formed integrally with the outer periphery of the diffuser 7, and a guide wall 13 extending from the outside to the inside is provided on the lower surface of the inclined passage.
is provided. 14 is a ring, which has an arcuate concave surface 15 on its inner peripheral side.

The flow of air in this electric blower 1 is shown by arrows.

In the electric blower 1 having the above configuration, the fan 10
The airflow pushed out by the centrifugal force of
6 and inside the electric motor section, and is discharged from the exhaust port 17 of the bracket 4 to the outside of the machine.

This electric blower! and conventional electric blower 2! The suction characteristics (suction power and air volume/vacuum characteristics) were tested. The test conditions are as follows.

Both electric blowers 1/2! In both cases, the motor power consumption is sooo
, motor rotation speed is 3500 rpm, core outer diameter 88 mmφ
, the outer diameter of the fan 10 is 110 mmφ. The diffuser 7 in both electric blowers 1-21 has an outer diameter of 1
32mmφ, D diameter shown in Figures 3 and 12 is 120
mmφ and height (F shown in FIG. 6) is 10 mm.

And the ring 14 provided in the electric blower l of the embodiment
has an outer diameter of 132 mmφ and an inner diameter (C shown in Figure 7).
is 125 mmφ, and the height (E shown in FIG. 6) is 5 mm.

The results of the test conducted under the above test conditions are shown in FIG.

As can be seen from FIG. 9, the maximum value of the suction power in the conventional electric blower 21 is 2! OW, whereas the maximum value of the suction power of the electric blower l of the example is 217W.

In this electric blower 1, a ring I4 having an arcuate concave surface 15 is provided at the circumferential corner where the motor frame 5 and the fan cover 11 are in contact to smoothly guide the airflow to the ventilation 016. For this reason, the airflow guided from the inclined passage 2 of the diffuser 7 is directed to the ring I4.
concave surface! 5 without generating a vortex, and is smoothly guided to the ventilation port 16 of the motor frame 5. Therefore, according to this electric blower l, the suction performance is significantly improved and the noise is also reduced.

(f) Effects of the Invention According to the present invention, suction performance can be significantly improved simply by additionally installing a simple and inexpensive ring. In addition, the noise caused by the air vortex can be eliminated, and the overall sound of the electric blower can be reduced.

[Brief explanation of drawings]

1 to 9 show examples. That is, Fig. 1 is a sectional view of the main parts of the electric blower, Fig. 2 is a back view of the diffuser and ring that constitute the electric blower, and Fig. 3 is a plan view of the diffuser and ring.
Fig. 4 is a perspective view of the diffuser and ring, Fig. 5 is a partially omitted sectional view taken along the line v-■ in Fig. 4, and Fig. 6 is a partially omitted sectional view taken along the line ■-■ in Fig. 4. Figure 7 is a perspective view of the ring, Figure 8 is an enlarged view of section A in Figure 1, and Figure 9 is a perspective view of the ring.
The figure is a diagram showing the suction characteristics of an electric blower. 1O to 13 show conventional examples. That is, Fig. 10 is a sectional view of the main part of the electric blower, and Fig. 11 is a sectional view of the main part of the electric blower.
The figure is a rear view of the diffuser, FIG. 12 is a plan view of the diffuser, and FIG. 13 is an enlarged view of section 8 in FIG. 10. Fig. 1 1...Electric blower, 3...Stator assembly, 5...Motor frame, 7...Diffuser, 9... Nut, 1 11... Fan cover, 1 13... Guide wall, 1 15... Concave surface, 1 17... Discharge port, 1 2!・・・・・・Electric blower. 2... Rotor assembly section, 4... Bracket, 6... Screw, 8... Shaft, 0... Fan, 2... ... Slanted passageway, 4 ... Ring, 6 ... Ventilation hole, 8 ... Corner part, Fig. 2 Fig. 3 Fig. 7 Fig. 4 Fig. 5 Figure 6 Figure 9 Procedural Amendment 1. Display of the case 1999 Patent Application No. 213927 Name of the invention Electric blower Amendment person Relationship to the case Patent applicant Notes Location 2-18 Keihan Hondori, Moriguchi City Name
(188) Satoshi Iue, Representative of Sanyo Electric Co., Ltd.

Claims (1)

[Claims] 1. A diffuser is disposed between the fan and the motor frame, the diffuser changes the direction of airflow generated by the fan, and the airflow is guided into the motor through a ventilation hole provided in the motor frame. In the electric blower, a ring is provided at the circumferential corner where the motor frame and the fan cover are in contact, which has an arcuate concave surface and can smoothly guide the airflow whose direction is changed by the diffuser to the ventilation hole. An electric blower characterized by: