JPS6147997B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of an impeller in a centrifugal electric blower.

Figure 1 shows the general configuration of a centrifugal electric blower. 1 is a casing with a suction port 2 opened in the center of the upper part, and the opening opposite the suction port 2 is attached to the motor frame 3 by press fitting. It is being
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 this motor shaft 6 by tightening it with a nut 7. 8 is a motor.

By rotating the impeller 4, airflow is generated, and the path of the flow is the suction port 2.
→ Inside the impeller 4 → Air guide 5 → Inside the motor 8 and is discharged to the outside in this order.

Let's now focus on the impeller in the electric blower shown above. FIG. 2 shows the configuration of a conventional impeller. As is clear from this, the caulking allowance 1 of the blade 12 is inserted into the caulking holes 11 made in the front shroud 9 and the rear shroud 10.
3 (state shown in FIG. 2), and then crimped the caulking allowance 13 to complete the impeller (state shown in FIG. 2).

Conventional impellers made in this manner have various drawbacks. In other words, the process becomes complicated because a large number of crimping allowances are crimped, and gaps may occur between the shroud and the blade due to variations in crimping force.
Further, due to variations in the crimping force, the impeller cannot be crimped properly, which weakens the strength of the impeller, and there is a possibility that the shroud and the blades may come apart.

The present invention aims to eliminate the above-mentioned drawbacks of conventional impellers and provide a strong impeller using a simple manufacturing method.

That is, the centrifugal electric blower of the present invention is arranged such that the mutual spacing is gradually narrowed in the outer circumferential direction, and the shroud has a hook hole, and the shroud engages with the hook hole, and the tip extends in the outer circumferential direction. The shroud and the blade are equipped with a blade with a facing hook-shaped protrusion protruding from the edge and whose height gradually decreases toward the outer circumference, and by inserting the protrusion into the hook hole and moving it toward the outer circumference, the shroud and the blade are They are integrated to form an impeller.

Therefore, the impeller can be easily assembled, and the shroud and blade can be more firmly integrated by centrifugal force without any gaps.

An embodiment of the impeller according to the present invention will be described below with reference to the drawings. In FIG. 3, 14 is a front shroud, and 15 is a rear shroud, each of which has hook holes 16 and 17. Reference numeral 18 denotes a blade, and hook-shaped projections 19 and 20 are provided on the edges facing the front and rear shrouds 14 and 15.

In the above configuration, the manufacturing process of the impeller will now be explained. Hook-like protrusion 19,2 of blade 18
0 into the hook holes 16 and 17 for temporary assembly (Fig. 3B). Thereafter, by extruding each blade 18 in the radial direction toward the outer circumference, the shrouds 14 and 15 fit into the gaps 21 and 22 between the hook-shaped projections 19 and 20, resulting in a completed product (FIG. 3C).

In this way, in the impeller of the present invention, both the front and rear shrouds are fixed by the hook-like projections during assembly,
Further, when the impeller rotates, a force directed toward the outer circumference in the radial direction due to centrifugal force is applied to the blades, so that both shrouds are fixed even more strongly. Furthermore, by designing the hook dimensions, the gap between the shroud and the blade can be made extremely small. Therefore, the impeller according to the present invention is easy to manufacture and has high strength.
The result is one with no gaps.

[Brief explanation of the drawing]

Figure 1 is a partially cutaway sectional view of a centrifugal electric blower.
Figures 2 to 2 show a conventional impeller, with 1 being an exploded sectional view and 2 being an explanatory diagram of its assembly. 3A to 3C show an impeller according to an embodiment of the present invention, where A is an exploded sectional view and B and C are assembly explanatory views. 14, 15... Shroud, 16, 17... Hook hole, 18... Blade, 19, 20... Protrusion.

Claims (1)

[Claims] 1. A pair of shrouds that are disposed with mutual intervals gradually narrowed in the outer circumferential direction and have hook holes, and a hook-shaped protrusion that engages with the hook holes and has a tip facing toward the outer circumference. It is equipped with a blade that protrudes from the edge and whose height is gradually lowered toward the outer circumference, and by inserting the protrusion into the hook hole and moving it toward the outer circumference, the shroud and the blade are integrated to form an impeller. Centrifugal electric blower.