JPS60125798A - Motor fan - Google Patents

Abstract

PURPOSE:To prevent generation of turbulent flow in the suction stream of air, increase the flow amount of a fan, improve the efficiency and miniaturize the fan by a method wherein a substantially conical rotor is provided integrally with two kinds of blades from a smaller diametral position than a suction port and the larger diametral position than the suction port. CONSTITUTION:Air is sucked from a suction port 38 by the rotation of a motor, not shown in the diagram, however, the rotor 29 of an impeller 23 is substantially conical, therefore, air stream enters into the impeller 23 smoothly. The blades are consisting of the blades 30, provided from the smaller diametral position than the diameter of a suction port 38, and the blades 31, provided from the larger diametral position than the diameter of the suction port 38, therefore, the amount of air for the impeller 23 is increased and the air is discharged under increasing the pressure between the blades 30, 31. The discharged air flows into the volute chambers 24 provided at the outer periphery of the impeller 23 in a large number and the dynamic pressure of the air is converted into the static pressure thereof by the chambers 24 and the curved surface 37 of a fan casing 36. According to this method, the increase of air-flow amount, improvement of the efficiency of the fan and the miniaturization of the device may be permitted.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention 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 a metal plate of a front shroud 2 and a rear shroud 3. There are four volute chambers 5 on the outer periphery of the impeller 1.
A fan case 7 covers the outer periphery of the diffuser 6. The impeller 1 is attached to a motor shaft 8, and an air suction port 9 is formed in the fan case. Shi power\shi,
With this configuration of the electric blower, there is a limit to how much the electric blower can be made into a /1-type electric blower.

That is, in order to secure the air blowing capacity of the electric blower and make it l]·8 μ, the diameter of the impeller 1 is made smaller and [! JJ: It is possible to increase the number to It's something that can't be rotated.

Purpose of the Invention Does the present invention solve the problems of the conventional electric blower mentioned above? The purpose is to provide an electric blower that is small in size and has more power by increasing fan efficiency.

Structure of the Invention The electric blower according to the present invention has a conical rotor with 2 f! ! a fan casing that covers the impeller and the diother and forms the above-mentioned suction port. This increases the suction air volume and improves fan efficiency.

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

FIG. 3 shows a vacuum cleaner with a built-in electric blower, in which an impeller 23 is fixed to the shaft 22 of a motor 21, and a number of independent volute chambers 24 are formed around the outer periphery of the impeller 23. There is. This volute chamber 24 is provided in the dihyuser 26, and is provided in the suction hole 2 of the motor 21.
1' through a passage to guide the air blown by the impeller 23. The air that has cooled the inside of the motor 21 is discharged to the outside from the cleaner body. 26 is a vibration isolator that holds the electric blower, 27 is a cord reel, and 28 is a filter.

First, the structure of the impeller 23 will be explained with reference to FIGS. 4 and 5.

29 is the rotor of the impeller 23, which has a conical shape, and the rotor 29 has grades 30.
31 is integrally provided with a type 2 aluminum die cast, resin, or the like. The blade 30 is an air suction port (described later)
The blades 31 are provided parallel to the shaft 22 of the motor 21 and curved in the radial direction from the position where the diameter is slightly smaller than that of the suction port, and the outer end of each blade 30. The delay angle β0 with respect to the rotation direction (arrow) of 21 is also composed of -.

Next, FIG. 6 shows the structure of the dihyuser 25.

This will be explained with reference to FIG.

The dihyuser 26 has a large number of tongs 32 radially provided around the outer periphery of the impeller 23, and furthermore, guide vanes 34 for a return passage are continuously provided from the terminal end 33 of the tongs 32 to form a volute chamber 24. . The volute chamber 24 is configured such that its volume gradually expands as it moves away from the impeller 23.

Next, FIG. 8 shows the overall structure in which the impeller 23, the dihyuser 25, and other structural members are combined.

A dihyzer 25 is placed on the outer periphery of a motor bearing on the upper surface of the motor 21, and an impeller 23 is inserted onto the shaft 22 of the motor 21 and fixed with a screw 35.

A fan casing 36 is provided to cover the impeller 23 and the dihyuser 25, and the volute chamber 24
The portion along the outer periphery of the volute chamber 24 has a gently curved surface 3γ, so that air can be smoothly guided within the volute chamber 24.

In the above configuration, the impeller 23 rotates due to the rotation of the motor 21, and the suction hole 38 in the upper part of the fan casing 36 is rotated.
Air is sucked in from. Since the rotor 29 of the impeller 23 has a substantially conical shape, the air flow U smoothly enters the impeller 23, and the pressure increases between the many grades 30, 31.

Here, since the blades are composed of the blade 30 installed from a position slightly smaller than the suction aperture and the grade 31 installed from a position larger than the suction aperture, the amount of air into the impeller 23 increases, and each blade 3o, 31
Air is discharged while increasing the pressure between the two.

The discharged air flows into a large number of volute chambers 24 provided around the outer periphery of the impeller 23, and since the outer periphery of the fan casing 36 is a curved surface 37, the air flow is gradually decelerated.
Then, the direction is changed and enters the return passage to cool the inside of the motor 21. That is, dynamic pressure of air can be efficiently converted into static pressure by the curved surface 37 of the volute chamber 241.

Effects of the Invention The electric blower of the present invention has two grades integrally provided on the conical rotor at a position with a smaller diameter than the air suction port and a position with a diameter larger than the air suction port. It is possible to increase the air volume with a small fan without causing turbulence in the intake of air, and the efficiency of the fan can be increased.

Comparing the electric blower of this embodiment with a conventional electric blower, it is found that in the embodiment of the present invention, the outer diameter of the impeller 23 is 74 mm (
Conventionally, it was 146 mm), and the outer diameter of the fan casing 37 was 9
4 rMl (conventionally 127mm) + rotation speed 34,00
0rpm (previously 24,000rpm), the same performance as the conventional one can be obtained, and the diameter of the electric blower can be made smaller to about 64mm, and the vacuum cleaner itself can also be made smaller accordingly. It is something that can be done.

[Brief explanation of the drawing]

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, FIG. 3 is a cutaway sectional view of main parts of a vacuum cleaner showing an embodiment of the present invention, and FIG. 4 is a top view of an impeller in an electric blower showing an embodiment of the present invention. FIG. 5 is a longitudinal sectional view of the impeller, FIG. 6 is a -1 side view showing the relationship between the impeller and the DHY user, FIG. 7 is a bottom view of the DHY user, and FIG. 8 is an embodiment of the present invention. FIG. 2 is a cutaway sectional view of main parts of an electric blower. 21... Motor, 23... Impeller,
24... Volute chamber, 25... Dihyuser, 30.31... Blade, 36...
fan casing. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure Δ Figure 2 Figure 3 Figure 4 Figure 4 2, 9 Figure 6

Claims (1)

[Claims] The conical rotor has a position smaller in diameter than the air intake port,
An impeller having two types of blades integrally arranged parallel to the motor axis from a position larger than the suction diameter, a dihyuser having a number of independent volute chambers located around the outer periphery of the impeller, and the impeller. An electric blower comprising a fan casing that covers a dihyuser and forms the above-mentioned suction port.