JPS6325357Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an electric blower used, for example, in a vacuum cleaner.

[Conventional technology]

This type of electric blower is constructed as shown in FIG. 1, for example. That is, a is a drive motor, and this drive motor a is provided with a rectifying plate b, a centrifugal fan c, and a fan cover d in this order, and the airflow discharged from the fan c is directed to the rectifying plate b as shown by the arrow. and the inside of the drive motor a, and is discharged to the outside through the exhaust window e.

The centrifugal fan c is composed of a motor side plate part f, a non-motor side plate part g, a blade part h, and the like. Conventionally, the motor side plate part f has a flat disk shape as shown in the figure, while the non-motor side plate part g has an umbrella shape with its outer circumference inclined toward the motor side.

[Problem that the invention attempts to solve]

Therefore, since the air path taken in from the suction port i is bent at right angles (in the centrifugal direction) at the motor side plate portion f, there is a problem in that the windage loss is large.

Moreover, since the motor side plate part f has a flat plate shape, the center of gravity of the fan c is located above the motor side plate part f in the drawing. For this reason, an unbalance may occur due to the rotation of the fan at a position quite far from the bearing j, causing increased vibration of the electric blower.

Therefore, in order to eliminate the above drawbacks, for example, the second
As shown in the figure, a configuration in which the motor side plate part f and the anti-motor side plate part g were each shaped like an umbrella was also considered, but it was found that the windage loss was relatively large in this case as well. The cause of this is the uneven chain spacing m that spreads deep between the motor side plate part f and the rectifier plate b.
This is thought to be due to the formation of a loss due to the rotation of the motor side plate portion f at this location.

The present invention was developed based on the above-mentioned circumstances, and its purpose is to provide an electric blower that is less likely to cause vibrations due to fan imbalance and has less windage loss.

[Means for solving problems]

That is, the present invention provides an electric blower in which a rectifier plate, a centrifugal fan, and a fan cover are provided in this order on a drive motor, and the motor side plate portion and the non-motor side plate portion that constitute the centrifugal fan are arranged so that their outer peripheral sides are closer to the center. The fan facing part of the baffle plate, which is provided with a gap formed between the rectifying plate and the motor side plate part, is shaped like an umbrella so as to be inclined toward the motor side. This is an electric blower characterized by the following.

[Effect]

Therefore, according to the present invention, by forming the motor-side plate portion and the anti-motor side plate portion into umbrella shapes, the center of gravity of the fan approaches the bearing side, making it difficult for vibrations to occur due to unbalance of the fan. . Moreover, since the motor side plate part has a diagonal flow shape, the windage loss of the intake air is reduced, and since the fan facing part of the rectifier plate is shaped like an umbrella along the motor side plate part, the rectifier plate It is also extremely effective in reducing windage damage, as the gap between the fan and the motor side plate can be made uniform, making it difficult to cause losses due to rotation of the fan.

[Example of idea]

A first embodiment of the present invention will be described below with reference to FIG. In the drawings, reference numeral 1 indicates a drive motor. This drive motor 1 includes a stator (not shown) inside a motor case 3 in which an exhaust window 2 is formed.
The rotor 4 is housed therein. Further, 5 is a rotating shaft, and both ends of this rotating shaft 5 are supported by bearings 6 and 7. And the bearing 6 on the upper side of the diagram
are attached to an end face plate 3a constituting a part of the motor case, and several ventilation holes 8 are formed in this end face plate 3a.

The drive motor 1 is provided with a rectifying plate 10, a centrifugal fan 11, and a fan cover 12 in this order. This fan cover 12 is airtightly attached to the motor case 3, and an air guide port 13 is provided in the center of the fan cover 12.
has been established.

On the other hand, the centrifugal fan 11
1a, a plate portion 11b on the opposite side to the motor, and a plurality of curved blades 11c disposed between these plate portions 11a and 11b. Then, the rotating shaft 5 is inserted into the mounting hole 14 formed in the center of the motor side plate portion 11a, and the upper and lower washers 15, 16 and the nut 17 are inserted.
It is designed to be fixed to this rotating shaft 5 using a. On the other hand, a suction port 18 is provided at the center of the plate portion 11b on the opposite side of the motor, at a position facing the air guide port 13.

Each of these plate portions 11a and 11b is formed into an umbrella shape such that its outer peripheral portion is inclined toward the motor 1 side with respect to its center portion. The bent portion 19 of the motor side plate portion 11a is formed by bending washers 15, 16 which are bent into a similar shape.
The bent portion 19 is reinforced by being clamped. However, such a reinforcing structure is not necessarily required, and may be adopted as appropriate.

On the other hand, the current plate 10 has a fan facing part 10a facing the motor side plate part 11a with a gap 22 formed therebetween, and a plurality of fan facing parts 10a provided at equal intervals in the circumferential direction on the outer periphery of the fan facing part 10a. The air intake port 20 and a plurality of guide vanes 21 provided on the inner surface of the fan facing portion 10a are integrally molded from a synthetic resin material.

The fan facing portion 10a is shaped to be substantially parallel to the motor-side plate portion 11a, that is, parallel or nearly parallel, and is formed in an umbrella shape along the motor plate portion 11a.

In the first embodiment with the above configuration, when the centrifugal fan 11 is rotated by the drive motor 1, the air taken in from the air guide port 13 passes through the centrifugal fan 11 and the rectifying plate 10 as shown by the arrow, and then passes through the motor case 3. The air enters the inside and is exhausted to the outside through the exhaust window 2, and the drive motor 1 is cooled by this air flow.

According to the centrifugal fan 11, the motor side plate portion 11a and the non-motor side plate portion 11
b are each formed into an umbrella shape, so compared to the conventional product (first
(see figure), the center of gravity of the fan can be moved closer to the bearing 6. Therefore, it is extremely effective in preventing vibrations caused by unbalance when rotating the fan. Moreover, since the air passage formed by the motor side plate portion 11a is a diagonal flow, the air flow in the axial direction taken in from the suction port 18 is not bent at right angles, and windage loss can be reduced.

Moreover, since the fan facing portion 10a of the rectifier plate 10 is shaped like an umbrella and runs along the motor side plate portion 11a, the rectifier plate 10 and the motor side plate portion 11
The gap 22 between the fan and the fan becomes substantially uniform, so that loss due to rotation of the fan can be suppressed, and windage loss can be further reduced.

Note that FIG. 4 shows a second embodiment of the present invention, in which the fan facing portion 10a of the current plate 10
is formed into an umbrella shape as in the first embodiment, and the end plate 3a of the motor case has a nearly horizontal shape. By doing this, an enlarged air passage 23 is formed inside the rectifier plate 10 that widens in depth so that the cross-sectional area of the flow passage becomes wider toward the center of rotation, so that the rectification effect due to the differential user effect becomes even better. , efficiency is further improved.
The other basic structures are the same as those of the first embodiment, and the same effects as those of the first embodiment are achieved, so the same reference numerals are given to the common parts and the explanation thereof will be omitted. In the case of the second embodiment, a plurality of reinforcing beads 24 are formed at intervals in the circumferential direction on the bent portion 19 of the motor side plate portion 11a to reinforce the bent portion 19. ing.

[Effect of idea]

As described above, according to the present invention, the motor-side plate portion and the anti-motor side plate portion that constitute the centrifugal fan are each shaped like an umbrella with the outer periphery inclined toward the motor side, and the fan-facing portion of the rectifier plate is tilted toward the motor side. It is formed in an umbrella shape along the plate portion, making it difficult to generate vibrations due to unbalance of the fan, and also reducing windage loss.

[Brief explanation of the drawing]

FIG. 1 is a side view partially showing a conventional electric blower, FIG. 2 is a partially cross-sectional view showing another electric blower, and FIG. 3 is a partially cross-sectional view showing a first embodiment of the present invention. The side view and FIG. 4 are cross-sectional views showing a part of the second embodiment of the present invention. 1... Drive motor, 10... Rectifier plate, 10a...
...Fan opposing part, 11...Centrifugal fan, 11a...
...Motor side plate part, 11b...Counter-motor side plate part, 12...Fan cover.

Claims (1)

[Scope of utility model registration request] An electric blower in which a drive motor is provided with a rectifier plate, a centrifugal fan, and a fan cover in this order, and the airflow discharged from the centrifugal fan is discharged by passing through the rectifier plate and the drive motor,
The motor-side plate portion and the counter-motor side plate portion constituting the centrifugal fan are each shaped like an umbrella so that the outer periphery thereof is inclined toward the motor side relative to the center portion, and a gap is formed between the motor-side plate portion and the motor-side plate portion. The fan-facing part of the baffle plate provided with
An electric blower characterized in that it is formed into an umbrella shape along the motor side plate portion.