JPS593200Y2 - electric blower - Google Patents

Description

[Detailed description of the invention] This invention relates to an electric blower used in a vacuum cleaner.
This provides an efficient and high-performance electric blower.

Generally, a commutator motor is used as a motor for a fan used in a vacuum cleaner in order to reduce the size and rotate at high speed.

In the case of this commutator motor, since the motor temperature increases significantly during operation, it is necessary to cool the motor using exhaust gas.

For this reason, a structure is generally adopted in which the air discharged from the impeller is ultimately guided into the motor through a path that cools the motor while being discharged to the outside of the motor.

The conventional two-stage fan shown in FIG. 1 is provided with guide vanes 1 to guide airflow into the motor.

The guide vane 1 guides the airflow discharged from the second stage impeller 2 into the motor, and discharges the motor to the outside while cooling the motor.

FIG. 2 shows the guide vane 1.

The guide vane 1 has a shape having four vanes 4 fixed perpendicularly to a disc 3 by screws or welding.

The airflow discharged from the second-stage impeller hits the blades 4 and is abruptly changed direction and guided into the motor.

Since this method of guiding the airflow into the motor is based on colliding the airflow with the blades 4, there is a relatively large loss in flow, resulting in low fan efficiency.

The present invention solves the above-mentioned conventional drawbacks and improves the shape of the guide vanes to reduce loss in the guide vanes and provide a two-stage fan for vacuum cleaners with high fan efficiency. Examples will be described based on FIGS. 3 to 5.

In the figure, reference numeral 5 denotes the first stage casing, and a suction port 6 for sucking in airflow is provided in the upper center of the casing.

7 is a first stage impeller, and 8 is a first stage return passage.

The first stage return passage 8 is attached to the second stage casing 9 by caulking or welding.

A second stage suction port is provided in the upper center of the second stage casing 9 so that the motor shaft 10 passes therethrough, and also as a passage for the airflow to be sucked into the second stage impeller 11 after passing through the first stage return passage 8. 12 is the opening day.

The first casing 5 is attached to the second casing 9 by press fitting to prevent air leakage.

13 is a guide vane that smoothly guides the airflow discharged from the second stage impeller 11 into the inside of the motor, and this guide vane 13 is attached to the motor bracket 14 with screws.

The second stage casing 9 is press-fitted into the motor bracket 14 to prevent air leakage.

15 is a motor body. Figures 4 and 5 show the guide vane 13.
shows the shape of

Eight inclined blades 13b are provided around the disk 13a, and the inclined blades 13b have portions where they overlap with each other to form a passage.

The guide portion A of the guide vane 13 is constructed by stacking identical parts shifted by 45 degrees.

That is, the shape of each part is made of a single sheet metal as shown in FIG.
I have 4 3b's.

A hole 16 through which the motor shaft passes and four mounting holes 17 for attaching to the motor bracket are bored in the center of the disc 13a.

These four mounting holes 17 are two sets of mounting holes located symmetrically across the motor shaft and forming an angle of 45 degrees to each other as shown in the figure.

When these two guide vanes 13 are overlapped with a 45° shift, the overall shape becomes as shown in Fig. 4. Only two mounting holes for the motor bracket shown above pass through the two plates. Attaches to the bracket with screws.

In the above configuration, due to the rotation of the impeller with an outer diameter of 125 mm (approximately 2000 rpm), air sucked in from the first stage suction port 6 passes from the first stage impeller 7 through the first stage return passage 8 and is transferred to the second stage. It passes through the suction port 12 and is sucked into the second stage impeller 11.

The airflow discharged from the second stage impeller 11 flows through the guide vanes 13
It is guided into the inside of the motor and discharged to the outside while cooling the motor.

It is necessary to guide the airflow discharged from the second stage impeller 11 into the motor with as little loss as possible, but with conventional guide vanes, the second stage impeller 11
The airflow after being discharged from the guide vane collided with the guide vane, causing a sudden change in direction, resulting in a large loss.

When using the guide vanes of the present invention, the airflow after discharge from the second-stage impeller is guided by eight blades and passes through the passage formed by overlapping two blades, so the flow is rectified. and is smoothly guided into the motor.

Therefore, there is no collision like in the conventional example, so the 6th
As shown in the figure, we were able to significantly reduce loss and improve fan efficiency.

Moreover, since it can be made by stacking two pieces of the same part shifted by 45 degrees, productivity is excellent.

As described above, the present invention has a guide section for guiding airflow into the motor of an electric blower, which consists of a disk and a plurality of blades that are integrally formed on the outer periphery of the disk and inclined in the circumferential direction. Two blades are used, and the guide blades are stacked one on top of the other at different angles.

Therefore, the present invention provides an electric blower that has a simple structure and can improve productivity, and can effectively guide the airflow discharged from the impeller into the motor with little loss in flow, and has high fan efficiency. be able to.

[Brief explanation of the drawing]

Fig. 1 is a cutaway side view of the main parts of a conventional two-stage fan, Fig. 2 is a perspective view of its guide blades, Fig. 3 is a cutaway side view of the main parts of an electric blower according to an embodiment of the present invention, and Fig. 4 is a perspective view of the guide section of the blower, Figure 5 is an exploded perspective view of the guide section, and Figure 6 is an exploded perspective view of the guide section.
The figure is a comparison diagram of fan efficiency between a conventional example and a fan according to the present invention. A... Guide section, 11... Impeller, 1
3... Guide vane, 13a... Disc, 1
3b... Feather.

Claims (1)

[Scope of utility model registration request] In an electric blower that cools the motor body by guiding the airflow discharged from the impeller into the motor body through the guide part, the guide part is formed integrally with a disc and the outer periphery of this disc, and extends in the circumferential direction. An electric blower characterized in that it is constructed by using two guide vanes each consisting of a plurality of inclined blades, and overlapping the guide vanes at mutually shifted angles.