JPH10202701A - Injection mold and multi-vane radial fan molded by using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection mold capable of integrally forming a multi- wane radial fan by injection molding and the multi-vane radial fan molded by using the mold. SOLUTION: A second mold 3 for molding circular arc-shaped vanes has blocks 302a-302m arranged so as to be divided into a circumferential shape along the circular arcs of the vanes and also has vane molding recessed parts 304a-304m provided from the almost central part on the side surface side of one ends of the blocks 302a-302m toward the inner end side thereof. Further, the blocks 302a-302m can select the first position gathered to the innermost side and a second position diverged to the outermost side by rotating a support plate 301 provided with guide grooves 301a-301m for receiving the slide pins 303a-303m provided at the respective blocks.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection mold and a multi-blade radial fan molded using the mold.
More specifically, the present invention relates to an injection molding die capable of integrally forming components of a multi-blade radial fan and a multi-blade radial fan molded using the die.

[0002]

2. Description of the Related Art First, the structure of a generally used multi-blade radial fan 100 will be described with reference to FIGS. FIG. 4 shows a multi-blade radial fan 10.
0 is a perspective view, and FIG. 5 is an end view corresponding to line XX ′ in FIG.

Referring to FIGS. 1 and 2, a multi-blade radial fan 100 has a first annular disk 101 and a second annular disk 102 at a predetermined interval. A fluid port 101a is provided at the center of the annular disk 101.

A first annular disk 101 and a second annular disk 102
A plurality (13 in the present embodiment) of arc-shaped blades 103 are radially arranged at a predetermined pitch.

[0005] Multi-blade radial fan 10 having the above structure
Today, as shown in FIG. 5, reference numeral 0 denotes a first annular disk 101 formed by injection molding and a second annular disk 1 formed by injection molding.
02 and a plurality of arc-shaped wings 103 are bonded to each other using an adhesive or the like to form a finished product.

[0006]

However, in the multi-blade radial fan 100 described above, as shown in FIG. 5, a first annular disk 101, a second annular disk formed integrally, and an arc-shaped An operation for bonding the wing 103 is required. Therefore, the multi-blade radial fan 10
There is a problem that the cost required for manufacturing the O. 0 cannot be reduced.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an injection molding die capable of integrally molding a multi-blade radial fan by injection molding, and a multi-blade radial fan molded using the die.

[0008]

A multi-blade radial fan in which a plurality of arc-shaped blades are radially arranged at predetermined intervals between first and second annular disks arranged at a constant interval. An injection molding die for integral formation, comprising:
A first mold having a first recess for molding an annular disk;
A second mold including a plurality of blocks circumferentially divided and arranged along the arc of the blade to form a plurality of arc-shaped blades between the first and second annular disks; A third mold having a second recess for receiving the second mold and sandwiching the mold with the first mold, and a third recess for molding the second annular disk;

Further, the block is provided with a slit for forming a plurality of arc-shaped wings between the block and the block adjacent to each other, from a substantially central portion on one side surface of one end of the block toward the inner end. A wing-forming concave portion, a convex portion provided on the upper surface side of the block, a first position for receiving the convex portion of the block, and collecting the innermost portion from each block so as to have a function as a molding die; A guide groove for receiving a convex portion of each block is provided so as to be slidable between the fan and the second outermost position for removing the second mold from the fan after completion of molding of the fan. And a supporting plate provided.

Preferably, the guide groove is provided in an arc shape along the wing. By using the injection molding die having the above-described configuration, it is possible to integrally form the first and second annular disks and the plurality of arc-shaped blades radially arranged. Also, when removing the integrally formed multi-blade radial fan from the mold,
By rotating the support plate in a predetermined direction, all the blocks move outward along the guide grooves, and the second mold can be easily removed from the multi-blade radial fan, thereby improving workability. It is also possible.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to the drawings, an injection molding die for molding a multi-blade radial fan and a multi-blade radial fan molded by using the mold will be described with reference to the drawings. 3 will be described. The shape of the multi-blade radial fan that is finally completed is the same as that of the multi-blade radial fan 100 shown in FIG. FIG. 1 is a longitudinal sectional view of an injection molding die 10 according to the present embodiment, FIG. 2 is a plan view showing a first state of a second molding die 3, and FIG. FIG. 4 is a plan view showing a second state of the molding die 3.

First, referring to FIG.
Will be described. This injection molding die 10
Has a first molding die 2, a second molding die 3, and a third molding die 4.

The first molding die 2 has a first concave portion 2a for molding the first annular disk 101 and a convex portion 2b for forming an inlet / outlet for forming the fluid port 101a. Further, the first molding die 2 is also provided with an escape recess 2c for escaping the support plate 301 provided on the second molding die 3.

Next, the third mold 4 sandwiches the second mold 3 together with the first mold 2 and is provided with a second concave portion 4b for receiving the second mold 3;
The concave portion 4b is provided with a third concave portion 4a for forming a second annular disk.

Next, the structure of the second molding die 3 will be described with reference to FIG.
This will be described in detail with reference to FIG. This second molding die 3
In order to form a plurality of arc-shaped blades 103 between the annular disk 101 and the second annular disk 102, the arc-shaped blades 10
Blocks 302a to 302m that are circumferentially divided and arranged along the third arc.

In each of the blocks 302a to 302m, in order to form a slit between other blocks adjacent to each other in order to form a wing, each block is moved from a substantially central portion on one side to the inner end side. Wing forming recesses 304a-
304 m are provided.

Also, sliding pins 303a to 303m are provided on the upper surfaces of the blocks 302a to 302m.

On the upper surface side of each of the blocks 302a to 302m, a guide groove 301 for receiving the sliding pins 303a to 303m provided in each of the blocks 302a to 302m.
A support plate 301 provided with a to 301 m is provided.

The guide grooves 301a to 301m are shown in FIG.
After the completion of molding of the multi-blade radial fan, the blocks 302a to 302m are removed from the first position where the blocks 302a to 302m shown in FIG. As shown in FIG. 3 for removal, it is provided in an arc shape along an arc-shaped wing so as to be slidable between the outermost second position.

Therefore, in the state shown in FIG. 2, after the molding of the multi-blade radial fan is completed, FIG.
By rotating the support plate 301 in the direction indicated by the arrow A shown in FIG. 3, the blocks 302a to 302m are turned into the guide grooves 301a to 301m in the direction indicated by the arrow B in FIG.
, It is possible to remove the second mold from the molded multi-blade radial fan in one operation.

Also, by using the above-described injection molding die 10, the multi-blade radial fan 100 can be formed into a first annular disk 101, a second annular disk 102, and an arc-shaped blade 103.
Can be obtained integrally, and the work of attaching the components constituting the multi-blade radial fan as in the related art is eliminated, and the cost of the multi-blade radial fan can be reduced.

It should be understood that the embodiments disclosed herein are illustrative in all aspects and not restrictive. Therefore, the scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic configuration of an injection mold according to an embodiment of the present invention.

FIG. 2 is a plan view showing a first state of a second mold of the injection mold according to the present invention.

FIG. 3 is a plan view showing a second state of a second molding die of the injection molding die according to the present invention.

FIG. 4 is an overall perspective view showing the structure of a multi-blade radial fan.

FIG. 5 is an end view corresponding to line XX ′ in FIG. 4;

[Explanation of symbols]

 Reference Signs List 10 Injection molding die 1 Third molding die 1a Third concave portion 1b Second concave portion 2 First molding die 2a Escape concave portion 2b Inlet / outlet molding convex portion 2c First concave portion 301 Support plate 301a to 301m Guide groove 302a to 302m Block 303a to 303m sliding pin 304a-304m slit

Claims (3)

[Claims] 1. A multi-blade radial fan in which a plurality of arc-shaped wings are radially arranged at predetermined intervals between first and second annular disks arranged at a constant interval. A first mold having a first recess for molding the first annular disk; and a circumferentially divided mold along each arc of the plurality of blades. A second mold including a plurality of blocks to be arranged, and sandwiching the second mold with the first mold,
A third mold having a second recess for receiving the second mold and a third recess for molding the second annular disk, wherein the block is provided with the wing between adjacent blocks. A slit for molding, a wing-forming concave portion provided from a substantially central portion on the side surface side of one end toward the inner end side of the block, a convex portion provided on the upper surface side of the block, A first position that receives the convex portion and is collected on the innermost side from each of the blocks so as to have a function as a molding die, and after the molding of the multi-blade radial fan is completed, the second molding die is removed from the blade. A support plate provided with a guide groove for receiving the convex portion of each block so as to be slidable between the outermost second position for removal and each block. , Injection molds. 2. The injection molding die according to claim 1, wherein the guide groove is provided in an arc shape along the wing. 3. A multi-blade radial fan in which the first and second annular disks and the plurality of arc-shaped blades are integrally formed by using the injection molding die according to claim 1.