JPH03176127A - Method for integrally molding cross flow fan - Google Patents

Abstract

PURPOSE:To easily and integrally mold a cross flow fan by pulling out a plurality of gap forming molds interposed in the gaps between a large number of thin plates arranged radially in a radial outward direction. CONSTITUTION:When a plurality of the gap forming molds interposed in the gaps 2 between thin plates 1 are pulled out in a radial outward direction (p), all of the gap forming molds are not together pulled out and the group of the gap forming molds 3a in contact with one thin plate 1 on the surface side thereof is provided so as to pull out the molds 3a simultaneously in the relation between pins 7 and guide grooves 8 by the rotation of a cam disc 6 and the group of the gap forming molds 3b in contact with one thin plate on the rear side thereof are also provided so as to simultaneously pull out the molds 3b in the relation between the pins 7 and the guide grooves 8 in the same way by the rotation of the cam disc 6. The shape of each of the guide grooves 8 of the group of the gap forming molds 3b is formed into a concentric circular arc 8 up to the midway so that the group of the gap forming molds 3b are pulled out after the group of the gap forming molds 3a is pulled out and the group of the gap forming molds 3a and the group of the gap forming molds 3b are pulled out so as to provide a time lag. Therefore, a cross flow fan can be smoothly demolded in the radial outward direction (p) and the integral molding of the cross flow fan (a) becomes possible.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention generally applies to a cross-flow fan in which a large number of thin plates are arranged radially in parallel with gaps, which are widely used in blowers such as air conditioners. The present invention relates to an integral molding method for a cross flow fan, which is molded in the same way as other plastic products.

[Problems to be solved by conventional technology and invention]

2. Description of the Related Art Conventionally, a cross-flow fan is, for example, a type shown in FIG. 1.2, in which a large number of thin plates in the form of splash plates are arranged radially in parallel with gaps between the ribs.

Conventionally, in plastic molding of this cross flow fan, partial molding was performed by dividing the parts at the ribs, pulling out the gap forming mold from the axial direction (lateral direction), and gluing these partial molded products over the rib part I. I connected them together to make a crossflow fan.

However, this is extremely difficult to manufacture! The drawback was that it was not possible to produce A-products, and the cost was correspondingly high.

In addition, since it is a partially molded product, the roundness or balance with respect to the axis is poor, resulting in vibration and noise. This also had the disadvantage of requiring a higher cost.

The present invention provides a method for integrally molding a normal flow fan that solves the above-mentioned drawbacks. The explanation with reference numerals in the drawings is as follows.

When molding cross flow fan a with a mold,
This relates to an integral molding method for a cross-flow fan characterized in that a plurality of gap-forming molds 3 interposed in gaps 2 between a large number of thin plates 1 arranged radially in parallel are pulled out in a radially outward direction p. .

[For production]

A large number of thin plates 1 arranged radially in a cross flow fan a
[The plurality of gap forming metals 3 interposed in the tear gap 2 are released from the mold in the radially outward direction P, and the mold (core) 4 at the center of the cross flow fan a is released from the mold in the axial direction Qi to form the cross flow. Fan a is integrally molded.

〔Example〕

The moldability of a crossflow fan in which a large number of thin plates 1 in the form of splash plates are arranged radially between ribs 5 as shown in FIG. 1.2 will be described in detail.

First, the most preferred first embodiment will be described in detail.

When pulling out the plurality of gap forming molds 3 interposed in the gap 2 between the thin plates 1 in the radially outward direction p, all the gap forming molds 3 are not pulled out together, but are in contact with the front side of the - thin plates 1. The gap-forming molds 3a group are arranged so that they can be pulled out simultaneously by the rotation of the cam disk 6 due to the relationship between the pin 7 and the guide 1148, and the gap-forming molds 3b group that are in contact with the back side are also pulled out by the rotation of the cam disk 6. The shape of the kite groove 8 of the gap forming molds 3b group is changed so that the gap forming molds 3b group are pulled out before the gap forming molds 3b group are pulled out. The gap forming mold 3a group and the gap forming mold 3 are formed into concentric arcs 8'.
The h group is extracted with a time difference.

Therefore, especially in this embodiment, since the drawing is performed with a time lag, the gap forming mold 3b that is in contact with the front side of the thin sheet work is
When pulling out the group first, the thin plate 1 is supported by the gap forming mold 3b group that is in contact with the other back side, so it can be pulled out smoothly.When pulling out the gap forming die 3b group then, one side of the thin plate 1 Since it is already free, it can be pulled out smoothly, and the mold can be released extremely smoothly in the radially outward direction p without removing or damaging the thin plate 1. Integral molding is possible.

Further, pins 7 are provided in the gap forming mold 38 group that is in contact with the front side of the thin plate 1 and in the gap forming mold 3b group that is in contact with the back side of the thin plate 1.
Gap forming mold 3 due to the relationship between the guide groove 8 of the cam disk 6 and
The a group is pulled out at the same time, the gap forming molds 3bn are also pulled out at the same time, and the gap forming molds 3a group are pulled out at the same time, and then the gap forming molds 3b group are pulled out at the same time, so the work efficiency is greatly improved, and it is This is a molding method that enables integral molding with improved mass productivity.

Furthermore, this example will be explained in detail.

As shown in FIG. 3, the gap forming mold 3 is provided with a claw portion 9 interposed in the gap 2 between the thin plates 1 at its tip.

A pin 7 is attached to each left and right side of this gap forming mold 3, and a guide 112 of a guide plate 11 is inserted into a guide groove 8 of a cam disk 6 in which the pin 7 is arranged on the left and right sides as shown in FIGS. mating through.

In particular, Figure 5.6 shows the cross-flow fan's fly plate-like thin plate 18 gap forming mold 3. The pin 7, cam disk 6. Guide groove 8 and guide plate work 1 formed on cam disk 6
This shows the relationship between the guide grooves n.

Pin 7 of the gap forming mold 3a in contact with the front side of the thin plate 1
The guide groove 8 into which the gap forming mold 3a group is fitted is the cam disk 6.
The cam plate 6 is rotated so as to gradually release the mold from the thin plate 1.
The guide groove 8 into which the pin 7 of the gap forming mold 3b group, which is in contact with the back side of the thin plate 1 adjacent to the gap forming mold 3b group, is fitted, is provided in an elongated shape that gradually moves away from the center of the cam disk. The guide groove n of the guide plate 11 interposed between the cam discs 6 which have concentric arcs 8 with equal distances from the center of the cam discs 6 and then gradually move away from the center of the cam disc 6 is a guide Wi.
The figure shows a case where each gap forming die 3 is provided in a radial elliptical shape so as to guide the movement of the gap forming die 3 by the gap forming die 3 .

Next, the mold release procedure by the molding apparatus A that implements this embodiment will be described in detail with reference to FIGS. 7 to 9.

First, as shown in FIG. 7, a gap forming mold is formed in which resin is radially arranged from the injection cylinder nozzle t3 through the pot runner 14 in the mold (core) 4 at the center of the cross flow fan a, and from the outflow part. Shape it for 3 hours.

After molding, as shown in FIG. 9, the molding device A is slid back and forth to the right using the slide pin mark to break it.

Due to this sliding, the four-part slide plate 16, which presses and fixes the gap-forming mold 3 from the radial outward direction, slides upward along the angular pin 17 that is slidably fitted, and fixes the gap-forming mold 3. Release. Thereafter, the gap forming mold 3 is released.

The release of the gap forming mold 3 will be explained.

When the gear meshing with the cam disc 6 is rotated by a motor or by the vertical movement of a rod of a hydraulic cylinder attached to the cam disc 6, the cam disc 6 rotates a little.
As shown in FIG. 5, the gap-forming molds 3a group are simultaneously released from between the thin plates 1 by the difference in distance from the center of the guide groove 8, and the gap-forming molds 3b group are separated from each other by the difference in distance from the center of the guide groove 8. Since it is still sliding on the concentric arc 8' of the guide groove 8, it is not released from the mold.

When the cam disk 6 is further rotated, the gap forming molds 3a group continue to be gradually released, but the gap forming molds 3b group go beyond the concentric arc 8' and form an ellipse that moves away from the center of the cam disk 6. Start sliding the gap forming mold 3a.
Releases from the mold later than the group.

The guide grooves 8 of the gap forming molds 3a group and the gap forming molds 3b group are designed to have the same distance away from the center of the cam disk 6 and the same rotation angle, and when the rotation ends as shown in FIG.
The figure shows the case where the release state from the thin plate 1 is the same.

The shape of the guide grooves 8 of the gap forming molds 3a group is symmetrical with the shape of the guide grooves 8 of the gap forming molds 3b group, and a concentric arc 8' portion is provided toward the end of the contact, so that they are completely alternate. It may be designed to be released from the mold.

After the mold release of the gap forming mold 3 is completed, the core 4 is pulled out to the right with the cross flow fan a attached to its outer periphery, as shown on the right side of FIG.

Thereafter, the stripper Sakaide is pushed out to the left along the circumferential surface of the core 4 to strip the cross flow fan a.

This mold release procedure is performed in reverse to return to the molded state, and the resin is again injected from the injection cylinder nozzle 13, and the same procedure is repeated to perform integral molding and mass-produce.

Incidentally, the reference numeral 29 in the figure is a circular gate formed at the outflow portion.

Next, a second example will be explained in detail.

The second embodiment shown in FIGS. 1O to 12 is similar to the first embodiment described above.
Hydraulic cylinder 21 instead of cam disk type as in the embodiment
The gap forming mold 3 is released in the radial direction p.

Fig. 10 and Fig. 1+ are designed in such a way that rods 22 of hydraulic cylinders 21 are directly attached to each gap forming mold 3 arranged radially, and each hydraulic cylinder 21 is controlled to perform mold release. It is. At this time, each hydraulic cylinder 21 is pulled out at a time lag between the gap forming molds 3a group in contact with the front side of the thin plate 1 and the gap forming molds 3b group in contact with the back side, as in the first embodiment described above. It is desirable to control the

Note that the symbol * and U in the figure represent the gap forming mold 3a bay and its guide pin.

Further, FIG. 12 is designed to save the number of hydraulic cylinders 21 and to ensure that the gap forming molds 3a group and the gap forming molds 3b group are pulled out with a time difference. A protruding pin 19 with a stopper head, which has different lengths for the gap forming mold 3a group and the gap forming mold 3b group, is provided protrudingly from the tip of each of the radially outward directions p, and this ejector pin 19 has a stopper head. The fitting annular body 20 divided into several parts is fitted onto the pin 19 in a state where it cannot be pulled out, and the rod n of the hydraulic cylinder 21 is connected to this fitting annular body side, and the gap forming mold 3 is pulled out in the radial outward direction p. It is something.

That is, the fitting annular body 20 is moved in the radially outward direction p by the rod 22.
When pulled up, the gap forming mold 3a group with the protruding pin 19 with a stopper head starts to be released for short ejections, but the gap forming mold 3b with the protrusion pin 19 with a stopper head protruding from the group for long ejections. The group has a protruding pin 19 with a stopper head for this difference in length.
After sliding with respect to the fitting annular body 20, the mold release is started only by further pulling up the fitting annular body 20. Therefore, when removing the mold, there is a gap corresponding to the length of the protruding pin 9 with a stopper head. The forming molds 3a group and the gap forming molds 3b group are pulled out with a time difference.

Next, a third embodiment will be described in detail.

In the third embodiment, as shown in FIGS. 13 and 14, the gap forming mold 3 is released in the radially outward direction p using a release angular pin.

More specifically, the gap-forming mold 3 is formed with fitting grooves on the left and right sides that are inclined with respect to the mold opening direction of the molding apparatus A, and a mold release angular pin is fitted into the large fitting grooves.

That is, when the molding apparatus A is opened to the right, the gap forming mold 3 slides to the right and moves in a radially outward direction pt=M along the mold release angular pin.

In addition, the cross-sectional shape of the fitting rli 2B formed in the gap forming mold 3b group is not a perfect circle but an oval to provide play for the release angular pin z5, and the gap forming mold 3 is divided by this play.
It may be designed to delay the start of mold release of BN.

Note that the reference numeral n in the figure is a guide groove into which the pin 7 is fitted.

In this embodiment, the distinction between the front side and the back side of the thin plate l is not only a redundant expression to explain that the molds are released alternately, but also a difference between the details of the gap forming mold 3a and the group of gap forming molds 3b themselves. There is no such thing.

〔Effect of the invention〕

According to the present invention, a cross flow fan can be easily integrally molded.

Since it can be integrally molded, it becomes possible to mass-produce it, which makes it possible to provide a loss flow fan at a correspondingly low cost, and also to provide a highly practical cross flow fan that is well-balanced and free of vibration and noise.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a partially cutaway perspective view of the product, Fig. 2 is an enlarged cross-sectional view of the product, and Fig. 3 is a sloped surface of a part of the gap forming mold. Figure 4 is an enlarged view of a portion of the gap forming mold showing the state in which it is pulled out every other piece,
Figure 5.6 is a side sectional view showing the state in which the forming mold is pulled out;
FIG. 7 is a front sectional view of the molding device A in the first embodiment in the molding state, FIG. 8 is a partially cutaway side view of the molding device A in the first embodiment in the molding state, and FIG. 9 1 is a front sectional view of the molding apparatus A of the first embodiment in which the mold is broken, the gap forming mold is released, and the core is taken out, and FIGS. 10 and 11 are enlarged explanations of the main parts of the second embodiment. Figure 12 is the second
FIGS. 13 and 14, which are enlarged explanatory views of main parts of other examples of the embodiment, are front sectional views of the molding apparatus A in the third embodiment. a...Cross flow fan, 1...%Ji, 2...
Gap, Q,,, H! ! The trust mold. 75 parrot 1? 1 Lower 6a5 77 /y7A 7e Kohe 10/jp pu//(5) ``Sa/84 fear*/<Am July 1990 no 2-day

Claims (1)

[Claims] An integrated cross-flow fan characterized in that when molding the cross-flow fan with a mold, a plurality of gap-forming molds interposed in gaps between a large number of radially arranged thin plates are pulled out in a radial outward direction. Molding method.