JPH02140494A - Electric blower - Google Patents

Abstract

PURPOSE:To aim at improving the blast efficiency and decreasing the noise of an impeller by forming a current plate for dividing long blades and short blades disposed alternately between front shrouds and rear shrouds approximately in the vertical direction. CONSTITUTION:Long blades 29 and short blades 30 are disposed alternately between front shrouds 27 and rear shrouds 28, and a current plate 31 is further formed between both shrouds such as to divide the long blade 29 and the short blade 30 approximately in the vertical direction. With this structure, the turbulence and the pressure compression of the air current generated at both side faces of a long blade 29 and a short blade 30 or in the vertical direction inside an impeller rotating at high speed can be lessened, so that the improvement in the blast efficiency of the impeller 24 as well as the decrease in noise can be promoted.

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.

2. Description of the Related Art A conventional electric blower of this type includes an impeller 2 and an air guide 3 in a casing 1 as shown in FIG. 4, and a motor 4 rotates the impeller 2 at high speed to adjust the air volume and vacuum pressure. It was becoming more profitable. Also, impeller 2
As shown in Fig. 5, there are a front shroud 5, a rear shroud 6, and a plurality of long blades 7 made of sheet metal or aluminum
, and 8 short blades.

Problems to be Solved by the Invention However, the impeller 2 used in the electric blower is
It rotates at a very high speed of about 25,000 to 40,000 (r, p, m,), and the airflow flows from the inlet of the impeller 2 toward the outlet at high speed. Here, when considering the internal flow of the impeller 2, it is considered that turbulence in flow velocity and unevenness in pressure occur on both sides of the long and short blades 8 and in the vertical direction. This leads to a decrease in the air blowing efficiency of the impeller 2 and an increase in noise. In order to solve this problem, it is necessary to make the airflow flow smoothly and with less turbulence.

The present invention solves these problems by providing an electric blower that can achieve high air blowing efficiency and low noise by providing a rectifying plate that divides the long blades and short blades almost vertically inside the impeller. The purpose is to provide

Means for Solving the Problems In order to solve the above problems, the electric blower of the present invention arranges long blades and short blades alternately between a front shroud and a rear shroud, and arranges the long blades and short plates almost vertically. It is equipped with an impeller with a current plate formed between the front shroud and the rear shroud so that the shroud is divided into two parts.

Effect With the above-mentioned configuration, it is possible to straighten and soften the turbulence in the airflow velocity and pressure density that occur on both sides of the long and short blades inside the impeller and in the vertical direction using the rectifier plate, thereby reducing the turbulence of the airflow. As a result, the impeller's air blowing efficiency can be improved and noise can be reduced.

EXAMPLE Hereinafter, an example of the present invention will be described based on the drawings.

1 to 3 are a partial sectional view of an electric blower, a plan view and a sectional view of an impeller, and a sectional view of a main part of the impeller, showing an embodiment of the present invention. In FIGS. 1 to 3, reference numeral 21 denotes a casing, which has an air intake hole 22 opened in the center, and an air guide 23 is attached to the opposite side of the air intake hole 22 to prevent air leakage. 24 is an impeller made of resin material, which includes an intake hole 22 and an air guide 23.
is set between. 25 is a commutator motor for driving, and the airflow flowing from the intake hole 22 is transferred to the commutator motor 2.
5 is discharged from the exhaust hole 26 while cooling the inside thereof.

The impeller 24 has a front shroud 27 made of resin material.
and a rear shroud 28 and long blades 29 and short blades 30 arranged alternately therebetween.

31 is a front shroud 27 and a rear shroud 28 so as to divide the long blade 29 and the short blade 30 in a substantially vertical direction.
This is a rectifier plate formed between the two.

In this configuration, when the impeller 24 starts rotating at high speed by the commutator motor 25, the intake hole 2 of the casing 21
2 flows into the impeller 24 and the air guide 2
3 and flows out from the exhaust hole 26. In this process of airflow, the airflow inside the impeller 24 flows at a very high speed from the inlet to the outlet of the impeller 24, but at this time, turbulence in the airflow velocity and pressure increase Long blade 29 and short blade 30
Occurs on both sides and in the top and bottom directions. However, in the above configuration, the front shroud 27 and the rear shroud 2 are arranged so that the long blade 29 and the short blade 1 node 30 are divided almost vertically.
Since the rectifier plate 31 is formed between the impellers 8 and 8, the turbulent airflow within the impeller 24 is rectified, and the turbulence of the airflow is reduced. Therefore, it is possible to improve the air blowing efficiency of the impeller and reduce noise.

Effects of the Invention As described above, according to the present invention, a rectifying plate is formed inside the impeller between the front shroud and the rear shroud so as to divide the long blades and the short blades almost vertically. The flow of air is rectified by the rectifying plate, which makes it possible to improve the air blowing efficiency and reduce noise of the impeller and, by extension, the electric blower.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of an electric blower according to an embodiment of the present invention;
Figures 2 (a) and (b) are a plan view and a sectional view of the impeller of the same electric blower, Figure 3 is a sectional view taken along A-A of the same impeller, and Figure 4 is a sectional view of the impeller.
The figure is a partial sectional view of a conventional electric blower, and FIG. 5 is a plan view and a sectional view of an impeller of the conventional electric blower. 24... Impeller, 27... Front shroud, 28...
- Rear shroud, 29...long blade, 30...short blade, 31...straightening plate. Agent Yoshihiro Morimoto 23, -, 17-7+'A)' Rectification diagram Figure 3 Figure Tote c+1+- He To N /h /n Figure 4 Figure Da

Claims (1)

[Claims] 1. An electric blower equipped with an impeller formed between the front shroud and the rear shroud, with a rectifying plate dividing the long blades and short blades in a nearly vertical direction, which are arranged alternately between the front shroud and the rear shroud.