JPS6035198A - Electric motor-driven blower - Google Patents

Abstract

PURPOSE:To improve blast efficiency through prevention of disturbance of an air flow in a centrifugal impeller, by a method wherein an oblique flow impeller, having an approximately conical guide, is, coaxially with a centrifugal impeller, mounted to the suction part of the centrifugal impeller. CONSTITUTION:An oblique flow impeller 14, having an approximately conical guide 16, is, coaxially with a centrifugal impeller 10, mounted to a suction part 13 of the centrifugal impeller 10. Thus, an air flow, produced through the rotation of the oblique impeller 14, is sucked in a direction extending parallel to a shaft 9 of a motor. The air flow is smoothly changed along the guide 16 into a direction extending vertically to the shaft of the motor and is sucked in the centrifugal impeller 10, resulting in prevention of disturbance of the air flow.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric blower for generating vacuum pressure used in a vacuum cleaner, etc. 0 Structure of a conventional example and its problems Conventionally, in this type of electric blower, As shown in FIG. 1, a centrifugal impeller 3 is attached to the motor shaft 2 of the motor 1 with a nut 4
, and arrange the air guide 6 around the centrifugal impeller 3.
It was common to provide a casing 6 to cover them.

2. In such conventional electric blowers, when improvements are made to increase the air blowing rate, the improvements are mainly made to the shape of the centrifugal impeller 3 and the air guide 6, and the area around the suction lower 0 of the blower is No special efforts were made. Since the centrifugal impeller 3 sucks in the airflow parallel to the rotational axis by the force that causes the airflow to flow in a direction perpendicular to the rotational axis, the airflow from the suction port to the discharge port undergoes a sudden direction change inside the centrifugal impeller. are doing. As a result, complex airflow turbulence occurred in that area, and this airflow turbulence affected ventilation efficiency.

Purpose of the Invention The present invention eliminates the turbulence of the airflow in the centrifugal impeller that is seen in such conventional electric blowers, and improves the smooth flow of the airflow.
The purpose is to provide an electric blower with high air blowing efficiency.

Structure of the Invention The electric blower of the present invention includes a centrifugal impeller attached to a motor shaft, an air guide arranged around the centrifugal impeller,
A mixed-flow impeller is provided coaxially with the centrifugal impeller and has a substantially conical guide at the suction port of the centrifugal impeller. The mixed-flow impeller installed at the suction port of the impeller smoothly guides the air flowing into the centrifugal impeller to the discharge port without causing a sudden change in direction, eliminating turbulence in the air flow that occurs inside the centrifugal impeller and improving blowing efficiency. It has been improved.

Description of examples Examples thereof will be described below based on the accompanying drawings.

In FIG. 2, reference numeral 8 denotes a motor, and a centrifugal impeller 10 having a suction port 13 and a discharge port 13' is attached to a motor shaft 9 of the motor 8. An air guide 11 is disposed around the outer periphery of the centrifugal impeller 1o to guide the airflow discharged from the centrifugal impeller 1o into the motor 8, and a casing 12 is provided so as to cover these. At its end, the casing 12 is attached in a gas-tight manner to the motor casing 8'.

A mixed flow impeller 14 having a substantially conical guide is attached to the suction port 13 of the centrifugal impeller 10 and is connected to the motor shaft 9 by a nut 1.
5, it is attached coaxially with the centrifugal impeller 1o. Next, the configuration of the mixed flow impeller 14 is shown in FIGS. 3, 4, and 5.

The mixed flow impeller 14 has a plurality of blades 17 on the outer periphery of a substantially conical guide 16 that are angled toward the rotation of the motor.

The operation of the above configuration will be explained.

As the motor shaft 9 rotates, air is sucked in through the suction port 13 of the centrifugal impeller 1o, but the action of the centrifugal impeller 1o alone produces a force that causes the air to flow in a direction perpendicular to the motor shaft 9. Therefore, the force in the direction parallel to the motor shaft 9 at the suction port 13 is weak. However, in the present invention, the effect of the mixed flow impeller 14 allows air to flow smoothly also in a direction parallel to the motor shaft 9. That is, since the mixed flow impeller 14 is provided with a plurality of blades 17 on the outer periphery of a substantially conical guide 16 that are angled toward the rotation of the motor, the airflow is controlled by the rotation of the mixed flow impeller 14. Motor shaft 9
The airflow in the centrifugal impeller 10 is suctioned into the centrifugal impeller 10, smoothly changed direction along the guide in a direction perpendicular to the motor axis, and the air flow in the centrifugal impeller 10. disturbances are prevented. In this way, a sharing relationship is created in which the airflow parallel to the motor shaft 9 at the suction port 13 is guided by the mixed flow impeller 14, and the airflow in the direction perpendicular to the motor shaft 9 is guided by the centrifugal impeller 10. The air flow is not disturbed in such a centrifugal impeller 1o and the blowing efficiency is not reduced, but the effect is that the blowing efficiency is greatly improved.

Effects of the Invention As is clear from the above embodiments, the electric blower of the present invention has the following features:
In particular, since the diagonal flow impeller is installed coaxially with the centrifugal impeller at the suction port of the centrifugal impeller, the diagonal flow impeller sucks air from the suction port of the centrifugal impeller in a direction parallel to the rotation axis of the motor.
The airflow can be guided along a roughly conical guide and sent to the centrifugal impeller to smooth the airflow.
This makes it possible to obtain a blower with high air blowing efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of a conventional electric blower, and FIG. 2 is a perspective view of a diagonal flow impeller of the electric blower according to an embodiment of the present invention. 9...Motor shaft, 1o...Centrifugal impeller, 11...Air guide, 12...Casing, 13...River/suction port, 14・・・・・・Diagonal flow impeller, 16 ・・・Substantially conical guide. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2'' Figure 3 Figure 1''7 Figure 5

Claims (1)

[Claims] The centrifugal impeller is equipped with a centrifugal impeller attached to the motor shaft, an air guide placed around the centrifugal impeller, and a casing provided to cover these. An electric blower in which a diagonal flow impeller with a guide is installed coaxially with a centrifugal impeller.