JP3248316B2 - Impeller for electric blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller for an electric blower incorporated in a vacuum cleaner.

[0002]

2. Description of the Related Art In recent years, an impeller of an electric blower has a front and rear shroud and a blade integrated by caulking. Hereinafter, a conventional electric blower will be described with reference to FIG.

[0003] The casing 1 has a suction port 2 in the upper central portion, and an opening facing the suction port 2 is press-fitted into a motor frame 3 and attached. Further, an impeller 4 and an air guide 5 are provided inside the casing 1. 6
Is a motor shaft, and the impeller 4 is attached to the motor shaft 6 by tightening with a nut 7. 8 is a motor.

[0004] With the above structure, the centrifugal force generated when the impeller 4 is rotated at a high speed sucks the airflow from the suction port 2 and discharges the airflow in the centrifugal direction to generate a suction pressure. The flow path of the airflow is the inlet 2
The inside of the impeller 4 → the air guide 5 → the inside of the motor 8 is discharged to the outside in this order.

[0005] The process of manufacturing the impeller 4 is as shown in FIG. That is, the blade 1 is inserted into the caulking holes 11 provided in the front shroud 9 and the rear shroud 10.
Then, the caulking piece 13 is inserted (the state shown in FIG. 9B), and then the caulking piece 13 is caulked to complete the impeller 4 as shown in FIG. 9C.

[0006]

However, in the above-mentioned conventional construction, when the caulking piece 13 is caulked, the blade 1
2 has a problem that it is difficult to process it into a predetermined shape because it is deformed so as to be crushed. That is, FIG.
As shown in FIG. 0, the front shroud 9, the rear shroud 10, and the blade 12 are arranged at 90 degrees or more and 90 degrees or less, respectively, so that when the caulking piece 13 is caulked, the blade 12 It is deformed to be crushed.

[0007] The present invention seeks to solve the problems such a conventional structure has, that of providing a high electric blower impellers strength has the primary purpose.

[0008]

First means of the present invention for achieving the Means for Solving the Problems A first object, edges and front and rear surface shroud having a hook hole, a protrusion which engages with the hook hole A notch is provided at the upper end of the protrusion, and the protrusions inserted into the hook holes and divided by the notch are tilted in different directions to integrate the front and rear shroud and the blade. This is an impeller for an electric blower.

[0009]

First means of the action of the present invention, by defeating each section separated by notches of protrusions provided with notches at the upper end in different directions, so as to integrate the front and rear faces shroud and blade Assembling impeller
Thus, a strong impeller can be formed.

[0010]

EXAMPLES for the first reference example of the following present invention will be described. 1 and 2, reference numerals 14 and 15 denote a pair of a front shroud and a rear shroud provided in such a manner that the interval between them is gradually narrowed in the outer peripheral direction. The front shroud 14 and the rear shroud 15 have hook holes 16 and 17. 1
Reference numeral 8 denotes a blade provided between the front shroud 14 and the rear shroud 15. Blade 18
The projection 19 and the projection 2 are provided at the edges of the front shroud 14 facing the hook holes 16 and the rear shroud 15 facing the hook holes 17.
0 is provided.

With the above configuration, (a) shown in FIG.
The impeller is produced according to the steps (b) and (c). That is, the projections 19 and 20 of the blade 18 are inserted into the hook holes 16 and 17, respectively, and then the projections 19 and 20 are inserted.
To the front shroud 14 and the rear shroud 1 respectively.
It is pushed down along 5 and becomes a finished product.

By assembling the impeller as described above, deformation of the blade due to caulking as in the conventional example does not occur. That is, in this reference example , the protrusion 19
Since 20 is pushed down along the shroud surfaces of the front shroud 14 and the rear shroud 15, the blade 1
8, no vertical force is applied. For this reason, even if the blade 18 has a certain angle with respect to the front shroud 14 and the rear shroud 15 as shown in FIG. The impeller can be easily assembled into a predetermined shape.

Next, a first embodiment of the present invention will be described with reference to FIG.
A description will be given based on FIG. Reference numerals 21 and 22 denote a front shroud and a rear shroud, respectively.
Four. 25 is a blade, front shroud 2
1. The rear shroud 22 has protrusions 26 and 27 at the edges facing the hook holes 23 and 24. In this embodiment, the notch 28
29 are provided.

With the above configuration, (a) shown in FIG.
The impeller is produced according to the steps (b) and (c). That is, the protrusions 26 and 27 of the blade 25 are inserted into the hook holes 23 and 24, respectively, and then the protrusions 19 and 20 are inserted.
To the front shroud 21 and the rear shroud 2 respectively.
Push down along 2. At this time, in this embodiment, the projections 26 and 27 have notches 28 and 29 at the center, and are separated into left and right pieces by the notches 28 and 29. In this embodiment, the notch 28
By utilizing 29, the left and right pieces are pushed down in different directions to produce an impeller as shown in FIG.

The above impeller of the present embodiment as described, using the notches 28, 29, since by pushing the left and right pieces of the projections 26, 27 in different directions are produced the impeller, in the reference example This makes it possible to make the impeller stronger than the manufactured impeller.

[0016] Next, a second exemplary embodiment of the present invention FIG. 5
A description will be given based on FIG. Reference numerals 30 and 31 denote a front shroud and a rear shroud, respectively.
Three. 34 is a blade, front shroud 3
The rear shroud 31 has T-shaped projections 35 and 36 at the edges facing the hook holes 32 and 33. Further, as shown in FIG. 6, the blade 34 has an angle α exceeding 0 ° with respect to the radial direction of the front shroud 30 and the rear shroud 31.

With the above configuration, (a) and (b) shown in FIG.
-The impeller is manufactured according to the procedure shown in (c).
That is, first, the T-shaped protrusions 35 and 36 of the blade 34 are inserted into the hook holes 32 and 33. In this state, the projection 35.3
The projections 35 and 36 are engaged with the hook holes 32 and 33 by shifting the relative positions of the front and rear shrouds 30 and 31 with respect to the hook holes 32 and 33. In this embodiment , each blade 34 is fixed.
As shown in FIG. 6, the front shroud 30 and the rear shroud 31 are rotated in the same direction. At this time,
Blade 34 has front shroud 30 and rear shroud 3
1 has an angle α with respect to the radial direction, so that the front shroud 3 is formed in the gaps 37 and 38 between the T-shaped projections 35 and 36.
0. The rear shroud 31 is in a state of entering. Thus, the impeller becomes a finished product.

According to this embodiment , with the blade 34 fixed, the front shroud and the rear shroud 30.
You can assemble the impeller simply by turning 1
The impeller can be easily assembled. Further, when the impeller rotates, a radially outward force is applied by the centrifugal force of the blade, so that the front and rear shrouds 30 and 31 and the blade 34 are more strongly integrated. Therefore, a high-strength impeller for an electric blower is realized by a simple manufacturing method.

[0019]

According to first means of the present invention, in which it is possible to obtain a high electric blower impellers strength.

[Brief description of the drawings]

The first cross-sectional view for assembling the description of the impeller of the reference example of the present invention; FIG

FIG. 2 is a sectional view taken along line KK of the impeller.

FIG. 3 is a sectional view for explaining assembly of the impeller according to the first embodiment of the present invention;

FIG. 4 is a sectional view taken along line LL of the impeller.

[5] The second cross-sectional view for assembling the description of the impeller of exemplary embodiment of the present invention

FIG. 6 is a plan view of the impeller shown partially cut away.

FIG. 7 is a sectional view taken along line MM of the impeller of FIG. 5;

FIG. 8 is a front view showing a cross section of one side of a conventional electric blower.

FIG. 9 is a sectional view for explaining assembly of a conventional impeller.

FIG. 10 is a sectional view taken along line XX of the impeller.

[Explanation of symbols]

 14.21.30 Front shroud 15.22.31 Rear shroud 16.17.23.24.32.33 Hook hole 18.25.34 Blade 19.20.26.27 Projection 28.29 Notch 35.36 T-shaped protrusion

Continuation of front page (56) References JP-A-52-134114 (JP, A) JP-A-58-104397 (JP, A) JP-A-1-205889 (JP, A) JP-A-62-10497 (JP) , A) Japanese Utility Model Showa 48-74103 (JP, U) Japanese Utility Model Showa 55-59196 (JP, U) Japanese Utility Model Showa 61-55197 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB Name) F04D 29/30

Claims (1)

(57) [Claims] 1. A front and rear shroud having a hook hole, a blade having a projection provided on an edge thereof for engaging with the hook hole, a notch is provided at an upper end of the projection, and the hook hole is provided. An impeller for an electric blower in which front and rear shrouds and blades are integrated by tilting projections, which are inserted into a notch and divided by notches, in different directions.