JPS60125799A - Motor fan - Google Patents

Abstract

PURPOSE:To permit to improve the efficiency of a fan and intake air smoothly into the fan by a method wherein a conical rotor is provided with an impeller, formed vertically so that whose one end is extended into the direction of outer periphery from the position of an air suction port and the other end is extended into the inner peripheral direction and having a multitude of blades. CONSTITUTION:The rotor 30 of an impeller 23 is substantially conical and is provided with a hub, therefore, air stream, sucked from a suction port 38, enters into the impeller 23 smoothly. A blade 31 forms an inner blade section 31a by being connected to the rotor 30 with a curve from the upper end face (a) into the inner peripheral direction thereof, therefore, the suction port 38 occupies a large space and the air may be induced forcibly. The air in the impeller 23 is discharged under increasing the pressure thereof between a multitude of blades 31. The discharged air flows into a multitude of volute chambers provided at the outer periphery of the impeller 23, guided by a fan casing 37 curved smoothly and the dynamic pressure of the air is converted into the static pressure of the same efficiently during this period. According to this method, the efficiency of the fan may be improved and the smooth intake of the air may be effected.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an electric nozzle 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 dehydrator 6 having four volute chambers 6 was arranged around the outer periphery of the impeller 1, and the outer periphery of the deductor 6 was covered with a fan case 7. It is attached to the impeller 1n, and the fan case 7 has an air suction port 9 formed therein. but,
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 The weight balance was poor, and unbalance occurred during high-speed rotation, making ultra-high-speed rotation impossible. Due to its shape, the impeller 1 has the disadvantage that it tends to cause turbulence when air is sucked in, and its blowing efficiency is low.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned problems of conventional electric blowers, and provides a small electric blower that can increase fan efficiency and smoothly take in air.

Structure of the Invention The electric blower according to the present invention has a conical rotor, and a large number of blades formed upright with one end extending in the external direction from the position of the air suction port and the other end extending in the inner circumferential direction. It is equipped with an impeller, a fan casing having a large number of independent volute chambers located around the outer periphery of the impeller, and a fan casing forming the above-mentioned suction port with a full width of the impeller and the fan casing. This improves air flow and allows for smooth air intake.

EXAMPLE DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the accompanying drawings. Figure 3 shows a vacuum cleaner with a built-in electric blower.
An impeller 23 is fixed to a shaft 22 of a motor 21,
A large number of independent poll chambers 24 are formed around the outer periphery of the impeller 23. The volute chamber 24 is provided in the dihyuser 26 and is connected to the suction hole 26 of the motor 21 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. 2Y 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 6. The rotor 30 of the impeller 23 is shaped like a circle C1, and a large number of blades 31 are integrally formed upright on the rotor 30. The shape of the blade 31 is such that the upper end surface a of the blade 31 faces an air suction port (described later), and one end is curved in the outer circumferential direction from the air suction port position, and the outer end is bent in the rotation direction of the motor 21 (arrow ), while the other end is connected to the air. The blade 31 is connected to the shaft 2 of the motor 21.
It is installed perpendicular to 2.

Next, FIG. 6 shows the structure of the dihyuser 26.

This will be explained with reference to FIG.

The dihydrator 26 has a large number of tongues 33 arranged radially around the outer periphery of the impeller 23, and guide vanes 36 for a return passage are connected from the terminal ends 34 of the tongues 33 to form a volute chamber 24.

The volute chamber 24 is configured to expand with an expansion rate of about 70 such that the volume gradually expands as it moves away from the impeller 23.

Next, FIG. 8 shows an electric blower that combines the impeller 23, the blower 25, and other components. motor 21
Place the dihyuser 25 on the outer periphery of the motor bearing on the top surface of the motor.
Then, the impeller 23 is connected to the motor 21.
II22 and is fixed with screws 36.

A fan casing 37 is provided to cover the impeller 23 and the dihyuser 26. The fan casing 37 is provided with an air suction hole 38 at the center of its upper part.

In the above configuration, the impeller 23 rotates due to the rotation of the motor 21, and the suction [138≠
Δ to empty θi≠ (suction size car A - rotor 3 of impeller 23
Since o has a substantially conical shape and has a hub 31, the airflow smoothly enters the impeller 23.

In particular, since the blade 31 is joined to the rotor 3o in a curved line in the inner circumferential direction from the upper end surface a to form an inner blade portion 31a, the suction port 28 can be made large and air can be forcibly drawn. Then, the air within the impeller 23 is discharged while increasing the pressure between the many blades 31. The discharged air flows into a plurality of polyto chambers 24 provided around the outer periphery of the impeller 23, is guided by a gently curved fan casing 37, and enters a return passage 39 while being gently decelerated and changed direction. The inside is discharged with cold All L. During this time, the dynamic pressure of air can be efficiently converted into static pressure.

Effects of the Invention Since the electric blower of the present invention has a blade shape that extends inward from the air suction port and is provided on the rotor, the suction port can be made thicker and air can be drawn in smoothly. The grooved rotor has a conical shape, which reduces turbulence and increases the pressure between the impeller blades. Since the bushing is formed upright on the rotor, the impeller can be manufactured by simple resin molding. Therefore, the electric transport J! of the present invention! tJ has high fan efficiency and can be miniaturized.

[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, Figure 3 is a cutaway sectional view of the main parts of a vacuum cleaner, not showing an actual example of the present invention, and Figure 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 top view showing the relationship between the impeller and the dihy user, FIG. 7 is a bottom view of the dihy user, and FIG. 8 is a practical example of the present invention. FIG. 2 is a cutaway sectional view of essential parts of the electric blower shown in FIG. 21...Motor, 23...Impeller, 24...
...Polycoat room, 26-...Dyuser, 31...Flade, 3-...Fan casing. Name of agent: Patent attorney Toshio Nakao and one other name
1 page 2 figure 3? 4 Figure 4 Figure 5 Figure 6

Claims (1)

[Claims] A conical rotor has an impeller with many grades formed upright with one end extending outward from the air inlet position and the other end extending inward, and a large number of impellers on the outer periphery of this impeller. An electric blower comprising a dihyzer in which an independent volute chamber is located, and a fan casing that covers the impeller and dihyuser and forms the above-mentioned suction port.