JP3250237B2 - Electric blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric blower used for a vacuum cleaner.

[0002]

2. Description of the Related Art In recent years, vacuum cleaners have been characterized by enhanced suction power and reduced operating noise.
The electric blowers used are also producing many new technologies related to efficiency and noise.

[0003] A conventional electric blower will be described below. In FIG. 3 , reference numeral 1 denotes a casing, in which an impeller 2 and an air guide 3 are provided in the casing 1;
Is a motor. The impeller 2 is directly connected to the motor 4.

The operation of the electric blower constructed as described above will be described below. First, the impeller 2 was rotated at high speed by the motor 4 to obtain an air volume and a vacuum pressure, and the air flow passed through the air guide 3 from the inside of the impeller 2, passed through the inside of the motor 4, and flowed out.

When an air current passes through the air guide 3,
The dynamic pressure of the discharge airflow from the impeller 2 is converted into a static pressure to increase the vacuum pressure.

[0006]

However, in the above-mentioned conventional configuration, the airflow discharged from the impeller 2 is immediately after the airflow is discharged from the high-speed rotating impeller 2 at the inlet of the air passage of the air guide 3. Therefore, the disturbance is very large. For this reason, the distance of the passage is used for the purpose of eliminating turbulence before the function of smoothly reducing the flow velocity, which is the original function of the air passage, and the passage portion that can exert a smooth deceleration effect is relatively As a result, smooth deceleration could not be realized, and the overall blowing efficiency was reduced.

An object of the present invention is to solve the above-mentioned conventional problems, and it is a first object of the present invention to obtain an electric blower having a high blowing efficiency by rectifying air at an inlet of an air passage.

A second object is to provide an electric blower having a simple structure and high air blowing efficiency, which can realize industrial easiness while sacrificing a high degree of effect.

[0009]

According to a first aspect of the present invention, there is provided an electric blower comprising: a motor; and a casing mounted on a motor frame of the motor and including an impeller and an air guide. In the air guide, a plurality of substantially cylindrical pipes are arranged near the air passage entrance.

In order to achieve the second object, an electric blower according to the present invention comprises a motor and a motor frame of the motor.
To the impeller and air guide.
A chromatography shea ring, or outer periphery of the air guide of the impeller
In the air passage defined by the guide wall of the air guide,
Providing multiple partitions that are thinner than the guide wall,
It has a configuration in which a plurality of short air passages are formed.

[0011]

According to the electric blower of the present invention, since the airflow having a complicated flow discharged from the impeller is rectified at the inlet of the air guide and flows into the air passage, the flow becomes smooth in the air passage and the efficiency is improved. It will be well decelerated. As a result, loss due to turbulence in the air passage can be reduced, and efficiency can be improved.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 5 denotes a casing having an intake hole 6 at the center. The opposite side of the intake hole 6 is attached to the motor frame 8 of the motor 7 so that there is no air leakage. Reference numeral 9 denotes a centrifugal impeller having a plurality of blades, and an air guide 10 is provided around the impeller 9. The casing 5
Is formed so as to enclose the impeller 9 and the air guide 10, and is formed so that an air passage 12 formed by the casing 5 and the guide wall 11 of the air guide 10 has a passage that expands toward the outer periphery. A rectification passage 13 composed of a plurality of pipes is provided at an inlet of the rectifier 12.

The operation of the electric blower configured as described above will be described with reference to FIG. First, the airflow flowing out of the impeller 9 flows as a very turbulent flow near the inlet of the air passage 12. Thereafter, the turbulence is rectified and reduced as it passes through the inside of the rectification passage 13 having a plurality of pipe shapes, and the turbulence passes smoothly through the air passage 12.

Originally, the role of the air passage is to reduce the flow velocity of the air flow without loss, that is, to convert the dynamic pressure to the static pressure. However, in the conventional air passage, the turbulent flow from the impeller 9 is rectified. Most of the passages were used, so that the pressure recovery function due to deceleration could not be performed. As shown in this embodiment, the flow is rectified near the inlet of the air passage, so that the air passage 12 can efficiently carry out the function of converting the static pressure by deceleration, which is the original function.

Hereinafter, a second embodiment of the present invention will be described with reference to the drawings. In FIG. 2, a plurality of rectifying passages 15 having a thickness smaller than the guide wall 11 and a shorter length are provided near the inlet of the air passage 12. The same is true.

In the blower of this configuration, the impeller 9
Is very turbulent up to the vicinity of the inlet of the air passage 12, but the turbulence is rectified and reduced as it passes through the inside of the rectification passage 15 having a plurality of wall shapes, The air passes through the air passage 12 smoothly.

[0017]

As described above, the electric blower of the present invention rectifies a very turbulent airflow from the impeller by providing a plurality of pipe-shaped rectification passages at the inlet of the air passage in the air guide. Thus, it is possible to smoothly flow through the guide thereafter, thereby improving the blowing efficiency.

The present invention also relates to a motor and a motor for the motor.
Mounted on the motor frame, impeller and air guide
And a casing enclosing the air guide.
From the outer circumference of the prop, the outer circumference defined by the guide wall of the air guide
The air passage that expands toward
Providing a plurality of thin partition plates,
As a configuration that forms an air passage, the turbulence of the discharge flow from the impeller is reduced with a very simple configuration, and the subsequent air flow can smoothly pass through the guide, thereby improving the blowing efficiency Is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an electric blower according to a first embodiment.

FIG. 2 is a sectional view of a main part of an electric blower according to a second embodiment.

FIG. 3 is a sectional view of a conventional electric blower.

[Description of Signs] 10 air guide 12 air passage 13 pipe-shaped rectification passage 14 rectification wall 15 rectification passage

Continuation of the front page (56) References JP-A-4-303200 (JP, A) JP-A-5-84169 (JP, A) Patent 2740694 (JP, B2) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) A47L 9/00 F04D 29/44 F04D 29/66

Claims (2)

(57) [Claims] A motor and a casing attached to a motor frame of the motor and including an impeller and an air guide, wherein a plurality of substantially cylindrical pipes are provided near an inlet of an air passage of the air guide. Are provided along the passage, and the air passage of the air guide is started by the pipes. 2. A motor and a motor frame of the motor.
To the impeller and air guide.
The air guide impeller.
From the air guide to the outer periphery defined by the guide wall.
In the large air passage, use a thinner part than the guide wall.
Providing multiple cutting plates to form multiple short air passages
Electric blower that is.