JPS60128999A - Motor blower - Google Patents

Abstract

PURPOSE:To enhance the efficiency of a fan in a motor blower by providing a diffuser, in which a volute casing is located along the outside periphery of an impeller, in addition to a fan casing whose part along the outer periphery of the volute casing is formed in a curved surface. CONSTITUTION:Many blades 32, which are bent in the radial direction, are built as an integrated body into the hub surface 31 of the rotor 30 of an impeller 23. And along the outer periphery of the impeller 23, diffusers 25 are formed in a radial manner to form a volute casing 24. The volute casing 24 is formed in such a manner that its volume increases gradully according to a certain volume expanding rate as the distance from the impeller 23 increases. Thus, the pressure of air stream increases smoothly in the impeller 23 and inside many blades 32, thereby efficiently transforming dynamic pressure into static pressure. With this contrivance, dynamic pressure loss due to air collision can be reduced, ensuring static pressure recovery. Thus, efficiency of a fan can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric blower that is incorporated into a vacuum cleaner.

Conventional configuration and problems thereof Figures 1 and 2 show a conventional electric blower. In the figure, reference numeral 1 denotes an impeller, which is constructed by interposing curved blades 4 between the sheet metal of the front shroud 2 and the rear shroud 3. A dihyzer 6 having four polyneat chambers 6 was disposed on the outer periphery of the impeller 1, and the outer periphery of the dihyuser 6 was covered with a fan case 7. The impeller 1 is attached to a motor shaft 8, and the fan case 7 has an air suction port 9 formed therein. However, with this configuration of the electric blower, there is a limit to how small the electric blower can be made.

In other words, in order to secure the air blowing capacity of the electric blower and make it smaller, it is possible to reduce the diameter of the impeller 1 and increase the rotation speed, but since the impeller 1 is made of sheet metal, the impeller itself It is difficult to balance the weight, and unbalance occurs during high-speed rotation, making ultra-high speed rotation impossible.

In addition, the dynamic pressure discharged from the impeller 1 is efficiently converted into static pressure in the process of passing through the polyneedle chamber 6, increasing the efficiency of the fan. A wall is provided parallel to this, and the air discharged from the impeller 1 collides directly with the wall surface of the polyneedle chamber 6. Since the air collides with the surface 11 at almost the same speed as the speed discharged from the impeller 1, there is a drawback that a very large dynamic pressure loss occurs.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned problems of the conventional electric blower, and provides an electric blower that increases fan efficiency and is miniaturized.

Structure of the Invention The electric blower according to the present invention has a large number of blades arranged in the radial direction parallel to the motor axis on the hub surface of the conical rotor, and the outer ends of the blades are arranged at a lagging angle with respect to the rotational direction of the motor. a dither having a large number of independent polyneat chambers located around the outer periphery of the impeller, and a fan casing that covers the impeller and dither and has a curved portion along the outer periphery of the polyneat chamber. This allows the impeller to be molded with resin and eliminates airflow collisions in the polyneat chamber, resulting in an electric blower with high fan efficiency.

Description of examples An embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 shows a vacuum cleaner with a built-in electric blower. An impeller 23 is fixed to the shaft 22 of a motor 21, and on the outer periphery of the impeller 23 there are many independent plastic tools.
A chamber 24 is formed.

This polyneat chamber 24 is provided in the dihyuser 26, is connected to the suction hole 26 of the motor 21 through a passage, and is connected to the impeller 2.
3 to guide the air blowing. The air that has cooled the inside of the motor 21 is discharged to the outside from the cleaner body. 27 is a vibration isolator that holds the electric blower, 28 is a cord reel, and 29 is a filter.

First, the structure of the impeller 23 will be explained with reference to FIGS. 4 and 5. 30 is the rotor of the impeller 23, which has a conical shape, and a large number of blades 32 are integrally provided by curving in the radial direction from the hub surface 31 of the rotor 30, and the outer end of the blade 32 is connected to the rotation of the motor 21. It is configured to have a delay angle B with respect to the direction (arrow). That is, the blades 32 are axially parallel to the shaft 22 of the motor 21, eliminating the inducer of a so-called general mixed flow impeller.

Next, FIG. 7 shows the structure of the dihyuser 25.

This will be explained with reference to FIG.

The dihyuser 26 has a large number of tongs 33 radially provided around the outer periphery of the impeller 23, and guide vanes 36 for a return passage are provided continuously from the terminal ends 34 of the tongs 33 to form a polyneat chamber 24. . The polyneat chamber 24 is configured so that its volume gradually expands as it moves away from the impeller 23, with a certain volume expansion rate.

Next, FIG. 9 shows an electric blower in which the impeller 23, the dihyuser 26, and other components are combined. motor 21
A dihyuser 26 is placed on the outer periphery of the motor bearing on the upper surface of the impeller 26 , and the impeller 23 is inserted into the motor shaft 22 and fixed thereon with a screw 36 . A fan casing 37 is provided between the impeller 23 and the dihyzer 26, and the portion along the outer periphery of the bore chamber 24 is a gently curved surface 38,
Air is smoothly guided inside.

In the above configuration, the impeller 23 rotates due to the rotation of the motor 21, and the suction port 39 at the upper part of the fan casing 37 is rotated.
Air is sucked in from. Since the impeller 230 rotor 3O has a substantially conical nozzle surface 31, the airflow is smoothly discharged from the impeller 23 while increasing the pressure within the impeller 23 and between the many blades 32.

The discharged air flows into a polyneat chamber 24 constituted by tongs 33 of a large number of dihyusers 26 provided around the outer periphery of the impeller 23. Since the outer end wall of the polyneedle chamber 24 is covered with a fan casing 37 having a gently curved surface 38, the airflow enters the return passage 4° while gently decelerating and changing direction, thereby cooling the inside of the motor 21. During this time, the dynamic pressure of the air can be efficiently converted into static pressure.

In the shape of the impeller 23, in addition to the above structure, as shown in FIG. When the suction port 39 is curved parallel to the motor shaft 22 and in the radial direction from the position of the same diameter, the area of the suction port 39 becomes large and the air volume can be increased.

Effects of the Invention In the electric blower of the present invention, the impeller has a structure in which a large number of plates are provided on the hub surface of the rotor in parallel with the motor axis and in the radial direction. It can be easily processed by aluminum die-casting. In addition, the air discharged from the impeller flows smoothly and is decelerated in the volute chamber, which is provided in large numbers independently, and when exiting from the volute chamber, the curved surface of the fan casing reduces dynamic pressure loss due to air collisions. , the static pressure is sufficiently recovered, the efficiency of the fan is high, and the size of the fan can be reduced.

[Brief explanation of drawings]

Figure 1 is a cutaway sectional view of the main parts of a conventional electric blower, Figure 2
The figure is an exploded perspective view of a conventional electric blower, Figure 3 is a cutaway sectional view of essential parts of a vacuum cleaner showing an embodiment of the present invention, and Figure 4 is a top view of an electric vacuum cleaner showing an embodiment of the present invention. 7 is a top view showing the relationship between the impeller and the dihy user, FIG. 8 is a bottom view of the dihy user, and FIG. 9 is a cutaway sectional view of essential parts of an electric blower showing an embodiment of the present invention. be. 21... Motor, 23... Impeller,
24... Volute chamber, 26... Dihyuser, 32... Blade, 37...
・Fan cover, 38...Name of curved surface agent
Patent attorney Toshio Nakao and one other person Figure 1 Figure 2 Figure 3 Figure 5 Figure 7 Figure 5

Claims (2)

[Claims] (1) An electric blower comprising a dihyzer in which a large number of independent bolyte chambers are located around the outer periphery of an impeller, and a fan casing that covers the impeller and dihyuser and has a curved surface along the outer circumference of the polyneate chamber. (2) The electric blower according to claim 1, wherein several blades among the large number of blades are provided at a position having approximately the same diameter as an air suction port formed in the fan casing.