JPH02140493A - Electric blower - Google Patents

Abstract

PURPOSE:To aim at improving the blast efficiency of an impeller as well as decreasing noise by forming a short blade with a through part of a part of a front shroud or a rear shroud cut and raised up between the front and rear shrouds. CONSTITUTION:A short blade 30 among long blades 29 and short blades 30 disposed alternately between front shrouds 27 and rear shrouds 28 is formed by cutting and raising up a part of the external side 31 of the blade curved face, the rear shroud 28 facing inside or the front shroud 27. A through part 34 is provided at the formed short blade 30. In addition, a closing plate 33 is fixed by contact in order to close the opening part 32 created at the rear shroud 28 or the front shroud 27 by cutting. With such structure, the turbulence of air current generated in an impeller 24 during high speed rotation is lessened, so that the improvement of the blast efficiency and the lowering of the noise of the impeller 24 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.
is provided, the impeller 2 is rotated at high speed by the motor 4,
It was possible to obtain the air volume and vacuum pressure. Further, as shown in FIG. 13, the impeller 2 was composed of a front shroud 5 and a rear shroud 6 made of sheet metal, aluminum, etc., and a plurality of long blades 7 and short blades 8.

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 approximately 25,000 to 40,000 [r, p, m,), and the airflow flows from the inlet to the outlet of the impeller 2 at high speed. Here, when considering the internal flow of the impeller 2, it is conceivable that disturbances in the flow velocity and density and density of the pressure occur on both sides of the long blades 7 and the 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 and provides an electric blower in which the short blades of the impeller are improved so that disturbances in flow velocity and pressure density do not occur on both sides of the long blades and short blades and in the vertical direction. The purpose is to

Means for Solving the Problems In order to solve the above problems, the electric blower of the present invention has a penetration part between the front shroud and the rear shroud made of sheet metal or the like, and between the long blade and the front (or rear) shroud. A short blade is provided, and the short blade is formed by cutting and raising a rear (or front) shroud opposing the outside or inside of the curved surface of the blade, and at the same time blocking the opening where the rear (or front) shroud is cut and raised. It is equipped with an impeller with a closing plate.

Furthermore, the present invention is provided with an impeller in which the end surface of the short blade having a penetrating portion is formed into the same curved surface as the curved surface of the front shroud.

Effect With the above configuration, an impeller in which the short blades are cut and raised from the rear (or front) shroud opposite to the outside of the blade curved surface so as to form a penetration part between the front (or rear) shroud has a long blade. The turbulence in the airflow speed and the pressure density that occur on both sides of the blade and the short blade and in the vertical direction are canceled out by the above-mentioned penetration part, and the turbulence in the airflow can be reduced, thereby improving the impeller's air blowing efficiency and reducing noise. It is.

In addition, in an impeller formed by cutting and raising short blades from the rear (or front) shroud opposite to the inside of the blade curved surface, the outlet part of the short blades (outer periphery of the impeller)
can be formed up to the outer diameter of the impeller,
There is no need to intentionally increase the outer diameter of the impeller; on the contrary, even if it is made smaller, the same effect as described above can be achieved.

Furthermore, in an impeller in which the end surface of the short blades is formed to have the same curved surface as the front shroud, there is a penetration part along the direction of the airflow or a guide part by the short blades, which makes the airflow even more turbulent. Furthermore, it is possible to improve the air blowing efficiency of the impeller and reduce noise.

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 a first embodiment. In FIGS. 1 to 3, 21 is a casing, which has an intake hole 22 opened in the center, and an air guide 23 is installed on the opposite side of the intake hole 22 to prevent air leakage. 24 is an impeller having a plurality of blades, and is provided between the intake hole 22 and the air guide 23.

25 is a commutator motor for driving, and the airflow flowing in from the intake hole 22 is discharged from the exhaust hole 26 while cooling the inside of the commutator motor 25.

The impeller 24 has a front shroud 27 made of sheet metal or the like.
and a rear shroud 28 and long blades 29 and short blades 30 arranged alternately therebetween.

The short blade 30 is formed by cutting and raising a part of the rear shroud 28 facing the outside 31 of the blade curved surface, and then cutting and raising a part of the rear shroud 28 that faces the outside 31 of the blade curved surface.
A closing plate 33 for closing the rear shroud 28 is fixed in contact with the rear shroud 28. 34 is the front shroud 27 and short blade 30
This is a penetrating portion formed between.

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 may occur. Density and density occur on both sides of the long blade 29 and the short blade 30 and in the vertical direction. However, in the above configuration, since the penetration part 34 is formed, the above-mentioned turbulence in the flow velocity of the airflow and the density and density of the pressure cancel each other out,
There is less turbulence in the airflow, improving the air blowing efficiency of the impeller 24 and reducing noise. Furthermore, the volume of the first through-hole 34 can be easily changed by changing the size of the short blade 30 that cuts and raises the rear shroud 28, so it can be easily mass-produced industrially. Further, airflow leakage from the opening 32 of the rear shroud 28 is prevented by a closing plate 33.

FIG. 4 and FIG. 5 are a plan view and a sectional view of an impeller and a sectional view of a main part of the impeller showing a second embodiment. Fourth
In the figures and FIG. 5, 40 is an impeller, which has a front shroud 41 and a rear shroud 42 made of sheet metal or the like, and long blades 43 and short blades 44 arranged alternately therebetween. The short blade 44 is formed by cutting and raising a part of the front shroud 41 facing the outside 45 of the blade curved surface, and a closing plate 47 for closing the cut and raising opening 46 of the front shroud 41 is formed by cutting and raising a part of the front shroud 41 facing the outside 45 of the blade curved surface. 41. 48 is a penetration portion formed between the rear shroud 42 and the short blade 44.

In this configuration, the long blades 43 inside the impeller 40
Disturbances in airflow speed and uneven pressure occur on both sides of the short blades 44 and in the vertical direction due to the penetration portion 48 between the short blades 44 and the rear shroud 42.

The turbulence of the airflow speed and the density of the pressure cancel each other out, reducing the turbulence of the airflow, improving the blowing efficiency of the impeller 40 and reducing noise. The volume of the penetration part 48 is also the same as that of the front shroud 4.
Since the size of the short blade 44 for cutting and raising the blade 1 can be easily changed, mass production can be easily carried out industrially. Further, airflow leakage from the opening 46 of the front shroud 41 is prevented by the closing plate 47, and since this closing plate 47 is fixed to the front shroud 41 which is approximately umbrella-shaped, the impeller 40
When the impeller rotates at high speed, the strength of the front shroud 41, which is weaker than the flat plate rear shroud 42, can be improved, making it possible to provide an impeller that can withstand higher speeds.

6 and 7 are a plan view and a sectional view of an impeller and a sectional view of a main part of the impeller showing a third embodiment. 6th
In the figures and FIG. 7, 50 is an impeller, which has a front shroud 51 and a rear shroud 52 made of sheet metal or the like, and long blades 53 and short blades 54 arranged alternately therebetween. The short blade 54 is formed by cutting and raising a part of the rear shroud 52 facing the inner side 55 of the blade curved surface, and a closing plate 57 for closing the cut and raising opening 56 of the rear shroud 52 is formed by cutting and raising a part of the rear shroud 52 that faces the inner side 55 of the blade curved surface. 52 and is fixed in contact with it. Reference numeral 58 denotes a penetration portion formed between the front shroud 51 and the short blade 54.

In this configuration, the penetration portion 54 reduces turbulence in the airflow inside the impeller 50, improving the air blowing efficiency of the impeller 50 and reducing noise, as in the first embodiment. However, since the short blades 54 are formed by the rear shroud 52 facing inside the curved surface of the short blades 54, it is possible to form the short blades 54 close to the outer periphery of the impeller 50, and the rear shroud The above-mentioned effects can be obtained without further increasing the outer diameter of 52.

FIGS. 8 and 9 are a plan view and a cross-sectional view of an impeller, and a cross-sectional view of a main part of the impeller, showing a fourth embodiment. 8th
In the figures and FIG. 9, an impeller 60 has a front shroud 61 and a rear shroud 62 made of sheet metal or the like, and long blades 63 and short blades 64 arranged alternately therebetween. The short blade 64 is formed by cutting and raising a part of the front shroud 61 facing the inner side 65 of the blade curved surface. 61 and is fixed in contact with it. 68 is a penetration part formed between the rear shroud 62 and the short blade 64. In this configuration, the penetration part 68 can improve the air blowing efficiency of the impeller and reduce noise, as in the second embodiment. Similarly to the third embodiment, it is possible to provide a compact impeller 60 without increasing the outer diameter of the front shroud 61.

FIG. 10 is a plan view and a sectional view of an impeller showing a fifth embodiment. Similar to the third embodiment, the impeller 70
has a front shroud 1-71 and a rear shroud 72 made of sheet metal or the like, and long blades 73 and short blades 74 arranged alternately therebetween. The short blade 74 is formed by cutting and raising a part of the rear shroud 72 facing the inner side 75 of the blade curved surface.
A closing plate 77 for closing the cut-out opening 76 of No. 2
is fixed in contact with the rear shroud 72. 78 is a penetration part formed between the front shroud 71 and the similar plate 74, and this penetration part 78 has a curved surface of an end face 79 of the short blade 74 facing the front shroud 71.
Since it is formed to be the same as the curved surface of , the volume change of the penetration part 78 along the flow of the airflow is uniform,
It becomes possible to further improve the air blowing efficiency of the impeller 70 and reduce noise.

FIG. 11 is a plan view and a cross section of an impeller showing a sixth embodiment. Similar to the fourth embodiment, the impeller 80 has a front shroud 81 and a rear shroud 82 made of sheet metal or the like, and long blades 83 and short blades 84 arranged alternately therebetween. The short blade 84 is formed by cutting and raising a part of the front shroud 81 facing the inner side 85 of the curved surface of the blade, and a closing plate 87 for closing the cut and raising opening 86 of the front shroud 81 is attached to the front shroud. It is abutted and fixed to 81. Reference numeral 88 denotes a penetration portion formed between the rear shroud 82 and the short blade 84. Further, the curved surface of the end surface 89 of the short blade 84 facing the rear shroud 82 is configured to have the same shape as the curved surface of the front shroud 81. Therefore, a guide section is formed by the short blades 84 along the flow of the airflow, so that it is possible to further improve the air blowing efficiency of the impeller 80 and reduce noise.

Effects of the Invention As described above, according to the present invention, a short blade having a penetrating portion between the long blade and the front (or rear) shroud is provided between the front shroud and the rear shroud made of sheet metal, etc. After facing the outside of its blade curved surface (
In an impeller that is formed by cutting and raising the rear (or front) shroud, and also forming a closing plate to close the opening cut and raising the rear (or front) shroud, improvement of the impeller's air blowing efficiency and reduction of noise can be achieved by using sheet metal. This can be done with a simple method of cutting and raising it.

In particular, by fixing the closing plate to the front shroud side, the strength of the impeller can be improved and the impeller can be adapted to higher speeds.

In addition, in an impeller in which the short blades are formed by cutting and raising the rear (or front) shroud opposite to the inside of the blade curved surface, the short blades can be formed up to the entire outer diameter of the impeller, so it is possible to increase the outer diameter of the impeller. This has the effect of making it possible to provide a small, lightweight, and inexpensive electric transport machine.

Furthermore, in an impeller in which the curved surface of the end surface of the penetration part of the short blade is formed to be the same curved surface as the front shroud, a passage is formed that follows the flow of air within the impeller, further improving the impeller's air blowing efficiency and reducing noise. This has the effect of making it possible to provide an electric blower with reduced energy consumption.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view of an electric blower according to a first embodiment of the present invention, FIGS. 2(a) and 2(b) are a plan view and a sectional view of an impeller of the same electric blower, and FIG. 3 is an A of the impeller. 4(a) and 4(b) are a plan view and a sectional view of the impeller of the second embodiment, FIG. 5 is a BB sectional view of the same impeller, and FIG.
a) (b) is a plan view and a cross-sectional view of the impeller of the third embodiment, FIG. 7 is a C-C cross-sectional view of the same impeller, and FIG. 8 (a)
(b) is a plan view and a sectional view of the impeller of the fourth embodiment,
Figure 9 is a sectional view of the same impeller along line D-B, and Figure 10 (a) (
b) is a plan view and a sectional view of the impeller of the fifth embodiment;
1(a) and 1(b) are a plan view and a cross-sectional view of the impeller on the sixth actual flow side, and FIG. 12 is a partial cross-sectional view of a conventional electric blower.
FIGS. 13(a) and 13(b) are a plan view and a sectional view of an impeller of a conventional electric blower. 24.40,50,60,70.80...impeller,
27,41,51,61゜71.81...front shroud, 28,42,52,62,72.82...rear shroud, 29,43,53,63,73.83...long blade , 30° 44 , 54 , 64 , 74 , 8
4... Short blade, 32, 46, 56, 66.76° 86... Opening, 33, 47, 57, 67.77.8
7...Closing plate, 34,48°58.68,78.88・
... Penetration part, 79, 89... End surface. Agent Yoshihiro Morimoto 21, -, Keishinfu 4 22-, Danbu 23 - Air i'4 to 24 - Impeller 2 Dar - Shizukuryu Tekimoki Rou %'frL Moxibustion 0++- To NIN Ichigo! ″: E Nima Yodo Figure 12 Figure 73

Claims (1)

[Claims] 1. A short blade having a penetrating portion between the long blade and the front shroud is provided between the front shroud and the rear shroud made of sheet metal or the like, and the short blade is provided outside or inside the curved surface of the blade. An electric blower comprising an impeller formed by cutting and raising a rear shroud facing the rear shroud and having a closing plate for closing an opening formed by cutting and raising the rear shroud. 2. A short blade having a penetration part between the long blade and the rear shroud is provided between the front shroud and the rear shroud made of sheet metal or the like, and the front shroud has the short blade facing outside or inside the curved surface of the blade. An electric blower comprising an impeller formed by cutting and raising the front shroud and having a closing plate for closing an opening formed by cutting and raising the front shroud. 3. Equipped with an impeller whose end face of the short blades facing the front shroud has the same curved surface as the front shroud so that the change in the penetration between the short blades formed by cutting and raising the rear shroud and the front shroud is uniform. The electric blower according to claim 1. 4. The electric blower according to claim 2, further comprising an impeller in which the end face of the short blade formed by cutting and raising the front shroud and the curved surface of the front shroud are the same curved surface.