JPH03264798A - Electric motor-driven blower - Google Patents

Abstract

PURPOSE:To make a blower applicable to multipurpose vacuum cleaners through change of a disk part by constituting an impeller of a cone-shaped base body, having a plurality of sheets of blades in which a suction side is curved toward the direction of rotation of a motor and a blow-out side has a delay angle relating to the direction of rotation, and the disk part. CONSTITUTION:A centrifugal impeller 24 is provided in a casing 21 mounted air-tightly to a motor 30 and provided with a suction air hole 22 in the center, and an air guide 26 is provided being positioned in a lower part of the impeller 24. The impeller 24 is constituted of a base body 32 of almost cone shape enlarging its shape larger as it advances from the axial direction to the radial direction, plurality of sheets of blades 25 provided in this base body 32 and a disk part 33. The blade 25 is formed in a shape in a manner wherein a blow-out side has a delay angle relating to the direction of rotation while curving a suction side in the direction of rotation (arrow mark) of the motor 30. The disk part 33 is formed by providing blades 25a, smoothly continued to the blades 25, in the peripheral part, and a blower is made applicable to a vacuum cleaner of plural kinds by replacing this disk part 33.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an electric blower for use in a vacuum cleaner.

BACKGROUND ART Conventional electric blowers of this type have a typical construction as shown in FIGS. 4 and 5. That is, an impeller 2 and an air guide 3 are provided in a casing 1, and the impeller 2 is rotated at high speed by a motor 4 to obtain the necessary air volume and vacuum pressure. This impeller 2 has blades 5 and back plate 6.
It is composed of

Problems to be Solved by the Invention In the electric blower having the conventional configuration described above, once the impeller 2 is determined, the output is almost determined and constant.

For this reason, there was a problem in that it was necessary to develop a very large number of impellers to accommodate vacuum cleaners with a wide variety of uses.

The present invention has been made to solve these problems, and it is an object of the present invention to provide an electric blower that has a simple structure and can be used as a versatile vacuum cleaner.

Means for Solving the Problems Means of the present invention for achieving the above object includes a motor;
an impeller and a casing containing an air guide, the impeller having a conical base having a plurality of blades whose suction side is curved toward the rotational direction of the motor, and whose blowout side has a plurality of blades having a delay angle with respect to the rotational direction. and an electric blower comprising a disk portion having a blade smoothly continuous with the blade.

The working disc part has blades that are smoothly continuous with the blades of the impeller, and by simply changing the type of this disc part as necessary, it can be used with many types of vacuum cleaners with different performance. It is possible to provide a compatible electric blower.

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1, 2, and 3. 21 is a casing that has an intake hole 22 in the center and is attached to the motor 30 so that there is no air leakage. 24 is a centrifugal impeller arranged in the casing 21, and 26 is an air guide provided below the impeller 24. impeller 24
has a substantially conical base body 32 whose diameter increases from the axial direction to the radial direction, a plurality of blades 25 provided on the base body 32, and a disc portion 33. The blade 25 has a suction side curved in the rotational direction (arrow) of the motor 30 to facilitate the inflow of airflow, and an airflow side has a shape with a delay angle with respect to the rotational direction. Further, the base portion 33 of the disk portion 33 is collinear with the base body 32 and the motor shaft to form the impeller 24, and can be configured extremely easily. The casing 21 also includes a diffuser 27 formed between the casing 21 and the air guide 26, and has an airflow passage that expands toward the outer periphery. Air guide 26
A return passage 29 is formed at the end of the differential user 27 and smoothly communicates therewith, and the airflow is smoothly guided to the intake hole 28 of the motor through the return passage 29. The motor 30 described above is composed of a commutator motor for driving, and the airflow flowing into the intake hole 28 is discharged from the exhaust hole 31 while cooling the inside of the motor.

The operation of this embodiment will be explained below. The disk portion 33 is the base body 3
2, and the blades 25 of the base body 32 and the blades 25a are provided on the outer periphery of the impeller 24 so as to be continuous with each other. Therefore, the airflow inside the impeller 24 is controlled by the blades 25.
The water can flow continuously from the air to the blade 25a, receiving kinetic energy as if flowing over one blade. That is, the blade 25a of the disc portion 33
In this way, energy due to centrifugal force can be intentionally imparted to the airflow. As a result, the disc part 33 to be used
By appropriately selecting the type of output, it is extremely easy to obtain a predetermined output.

Effects of the Invention As described above, the electric sending am of the present invention includes a motor, a casing containing an impeller and an air guide, and the impeller has a suction side curved toward the rotational direction of the motor, and a blowout side curved toward the rotation direction of the motor. By using an electric blower consisting of a conical base having a plurality of blades having a lag angle with respect to the rotation direction, and a disc part having a blade smoothly continuous with the blades, the electric blower has a simple structure and is versatile in cleaning. Accordingly, it is possible to provide an electric blower having a configuration that can be applied to various types of machines.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an electric blower showing an embodiment of the present invention, Fig. 2 is a perspective view of the impeller, and Fig. 3 is a plan view of the disc.
FIG. 4 is a sectional view of a conventional electric blower, and FIG. 5 is a perspective view of the impeller. 21...Casing, 22...Intake hole, 24...
Impeller, 25/25a...Blade, 30...Motor, 32...Base, 33...Disc portion.

Claims (1)

[Claims] The impeller includes a motor, and a casing containing an impeller and an air guide, and the impeller is a conical shape having a plurality of blades curved toward the rotation direction of the motor on the suction side and having a lag angle with respect to the rotation direction on the blowout side. An electric blower comprising a shaped base body and a disc part having a blade smoothly continuous to the blade.