JPH0638453A - Electric blower - Google Patents

Abstract

PURPOSE:To provide a small-sized, high-output, and highly efficient electric blower with little current loss. CONSTITUTION:This blower is equipped with a centrifugal impeller 4 being coupled with a motor shaft 3, a diffuser 11 for guiding a sent-out air current, an air guide member 7 for guiding the air current having passed the diffuser 11, being fixed to a motor frame 9, and a casing 1 being set and fixed to the motor frame 9, containing the impeller 4 and the diffuser 11, and herein the adhesion between the diffuser 11 and the casing 1 is raised by installing fine projections at the set faces of the diffuser 11 and the casing 1 or filling up adhesive substance between them.

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 or the like.

[0002]

2. Description of the Related Art In recent years, electric blowers have become more and more high-input and high-output, and there is a market need for smaller size and higher efficiency.

Conventionally, this type of electric blower has been disclosed in Japanese Examined Patent Publication No. 52-
The structure is as shown in Japanese Patent No. 49168. The configuration will be described below with reference to FIG. FIG. 4 shows a configuration example of a conventional electric blower, in which a centrifugal impeller 4 fixed to a rotating shaft 3 of an electric motor 2 in a casing 1.
The centrifugal impeller 4 sucks air from the intake hole 5 of the casing 1 and sends it out in the radial direction. The airflow sent out from the impeller 4 is separated and rectified by the plurality of diffuser blades 13 of the diffuser 11, and is gradually guided to the exhaust hole 8 of the electric motor 2 through the downvolute portion 12 of the air guide member 7 while gradually expanding, and the air volume is increased. It was designed to obtain a vacuum pressure. Further, since the diffuser 11 is closely attached to the casing 1, the outer diameter portion of the diffuser 11 has a large curved surface.

[0004]

However, in the above-mentioned conventional configuration, the curved surface portion of the casing 1 and the curved surface portion of the diffuser 11 do not completely adhere to each other and a gap is generated, and the pressure of the air flow discharged from the impeller 4 is high. Therefore, since the air flows into the airflow adjacent to the diffuser blade 13 through this gap, there has been a problem that the separation and rectifying action of the airflow of the diffuser 11 is obstructed, and the vacuum pressure and efficiency decrease.

The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a high-efficiency electric blower which is small in size, high in output, and free from air flow loss.

[0006]

In order to achieve the above object, an electric blower of the present invention is fixed to a motor frame, a centrifugal impeller connected to a motor shaft, a diffuser for guiding an air flow sent from the impeller, and a motor frame. An air guide member for guiding the airflow passing through the diffuser, and a casing that includes the impeller and the diffuser and is fitted and fixed to the electric motor frame are provided, and a narrow projection is provided on the fitting surface of the diffuser casing. It is provided. Further, an adhesive or a filler, or a filler having an adhesive property is filled, applied or attached to the fitting surface of the diffuser and the casing.

[0007]

With this configuration, the airflow discharged from the impeller is separated and rectified by the diffuser vanes, and a protrusion provided on the fitting surface of the diffuser with the casing or an adhesive or a filling material on the fitting surface of the diffuser with the casing. By filling, applying or pasting an adhesive filler, the airflow rectified by each diffuser blade is prevented from flowing into the adjacent rectified airflow and disturbing the rectification effect, and the airflow to the air guide member is prevented. Is efficiently discharged and the flow loss of the air flow in the casing is reduced to obtain a high vacuum pressure.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In the figure, the same members as those in the conventional example are given the same numbers. In FIGS. 1, 2 and 3, 2 is a driving electric motor,
A casing 1 having an air intake hole 5 in the center thereof is airtightly fitted and attached to a frame 9 of the electric motor 2. Four
Is a centrifugal impeller having a plurality of blades and is a motor shaft 3
Is stuck to. Reference numeral 10 is an air guide provided between the impeller 4 and the frame 9 of the electric motor, and has an down guide portion 12 and is fixed to the frame 9.
The diffuser 11 is attached so as to overlap with the diffuser 11, and the thin protrusion 14 is provided on the fitting surface of the diffuser 11 with the casing 1 so as to be in close contact with the casing 1 and guide the air flow sent from the impeller 4. is doing.

In the above structure, the airflow generated from the impeller 4 which is driven by the electric motor 2 and rotates at a high speed is exhausted from the exhaust hole 8 of the electric motor through the air guide 10. The airflow is separated and rectified by the plurality of diffuser vanes 13 of the diffuser 11, and is gradually expanded and discharged through the downvolute portion 12 of the air guide member 7, but the fitting surfaces of the casing 1 and the diffuser 11 are in close contact with each other. Although it is a curved surface for improvement, a slight gap actually occurs and the pressure of the air flow discharged from the impeller 4 is high, so the air flow with a pressure higher than this gap leaks and the flow of the adjacent air flow Disturb the rectification effect. As a result, loss occurs and the vacuum pressure drops.

By providing a thin protrusion 14 on the fitting surface of the diffuser 11 with the casing 1, the curved surface portion of the diffuser 11 and the casing 1 is more closely adhered to prevent leakage of high-pressure air flow. This prevents the vacuum pressure from decreasing.

Further, by making the protrusion 14 thin,
When the casing 1 is press-fitted, in the fitting portion between the diffuser 11 and the casing 1, the protrusion 14 that is already in close contact is crushed, and the portion with a gap is filled with the protrusion 14, and the diffuser 11 and the casing 1 Can have higher adhesion.

The fitting surface may be closely attached by filling, applying or pasting an adhesive or a filler or a filler having an adhesive property.

[0013]

As is clear from the above description, the electric blower of the present invention eliminates the gap between the diffuser blade and the diffuser blade by eliminating the gap between the diffuser blade and the casing by providing a thin projection on the fitting surface of the diffuser. It is possible to obtain a high vacuum pressure that can be maintained without. Further, by making the protrusions thin, the adhesion can be enhanced, and stable performance can be obtained. In addition, the same effect as described above can be obtained by filling, applying, or sticking an adhesive, a filler, or a filler having adhesiveness to the fitting surface between the diffuser and the casing.

[Brief description of drawings]

FIG. 1 is a half sectional view of an electric blower of the present invention.

FIG. 2 is a plan view of a diffuser.

FIG. 3 is an enlarged view of a fitting portion between a diffuser and a casing.

FIG. 4 is a half sectional view of a conventional electric blower.

[Explanation of symbols]

 1 Casing 3 Electric motor shaft 4 Impeller 7 Air guide member 9 Electric motor frame 11 Diffuser 13 Diffuser blade 14 Diffuser protrusion

Claims (2)

[Claims] 1. A centrifugal impeller connected to a motor shaft,
A diffuser that guides the air flow sent from the impeller, an air guide member that is fixed to the electric motor frame and that guides the air flow that has passed through the diffuser, and a casing that includes the impeller and the diffuser and is fitted and fixed to the electric motor frame. And an electric blower having a narrow projection on the surface of the diffuser fitted with the casing. 2. The electric blower according to claim 1, wherein the fitting surface between the diffuser and the casing is filled with, or coated with or affixed with an adhesive or a filling material or a filling material having adhesiveness to eliminate a gap between the fitting surfaces.