JPS58195099A - Impeller of centrifugal blower - Google Patents

Abstract

PURPOSE:To easily prepare an impeller of a centrifugal blower, by forming mutually oppositely facing parts of two upper and bottom parts to a stepped shape in the radial direction and fitting said parts to each other. CONSTITUTION:An impeller main unit 1' is divided into two parts excepting an undercut part 3 of an impeller, and the upper part 4 is formed to a concaved shape in the vicinity of its center reversely the bottom part 5 is formed to a protrusive shape in the vicinity of its center. Since a rib 9 protruded in the radial direction and the shaft direction from the upper part 4 is formed so as to be fitted to a groove 10 provided to the bottom part 5 in an end face 7 contacted in the radial direction and in an end face 6 contacted in the parallel direction to a shaft, the impeller of a centrifugal blower is easily prepared.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an impeller for a centrifugal blower, and an object thereof is to provide an impeller that can be easily molded and has high strength.

The structure of a conventional centrifugal blower impeller (hereinafter referred to as an impeller) will be explained with reference to FIG. 1.2.The impeller body 1 is configured to be rotated by this.

Now, this type of impeller main body 1 is shown in the figure.

When molding is to be performed using a mold that can be pulled out in the B-B' force direction, that is, in the axial direction, the vicinity of the portion shown in 3 becomes a so-called undercut portion, and therefore the shape is such that it cannot be pulled out in the axial direction. Therefore, if you want to mold it, you will need a special method, such as using a side core or a casting method called the lost wax method, rather than a simple mold that punches out only in the axial direction.

The present invention aims to provide an impeller that solves the above-mentioned difficulty in molding, and embodiments thereof will be described below with reference to the accompanying drawings.

The impeller main body 1' shown in FIG. 3 is divided into two parts, avoiding the undercut part 3 of the conventional impeller shown in FIG. 1, and consists of an upper part 4 and a lower part 5.

The upper part 4 has a concave shape near the center (around the shaft), and the lower part 6 has a convex shape near the center so that they fit into each other, and near the outer periphery of the impeller body 1', It has an end face parallel to the axis and a radial direction 1 and 7, and is in a joined state.

FIG. 4 is an enlarged view of the end surface portion 8 where the upper portion 4 and the lower portion 5 contact near the outer periphery. Contact in the radial direction 11 and 7
And, at the end rr+i 6 which contacts the axis in the direction parallel to the axis, there is a rib 9 protruding from the upper part 4 in the radial direction and the axial direction.
It is formed to fit into a groove 10 provided in the lower part 5.

(-i+L: In the configuration, the impeller main body 1' consists of two parts, ie, upper and lower parts 4.
6, each of which has a shape that can be molded using a simple molding method. Furthermore, the opposing end faces in both the radial and axial directions at the outer circumference fit together via the ribs 9).
...and the strength when assembled is 1. ', j) It is very strong. :・□ ,,,,'1:・11111゜If the impeller according to the present invention is used as described above, it is easy to
- High strength products can be obtained using a simple molding method.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an impeller in a conventional centrifugal blower, Fig. 2 is an enlarged perspective view of main parts, Fig. 3 is an exploded perspective view of an impeller of a centrifugal blower in an embodiment of the present invention, and Fig. 4 is an essential part. FIG. 4...Top, 5...Bottom, 9...Rib, 1o...Groove. Name of agent: Patent attorney Toshio Nakao and one other person
'1 :l□・1・ :゛:゛1111111 V・・□,,. Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] (1)) - Consists of two lower parts, these 1
...The opposing parts at the bottom have a stepped shape in the radial direction, and are the impellers of a centrifugal blower fitted together. □ Hanetun.