JPH04367703A - Fikter for ventilation fan - Google Patents

Abstract

PURPOSE:To make it possible to dispose of a filter having a filter frame made of a resin with a compact size by folding it double at prescribed sites. CONSTITUTION:A filter film 19 and a frame body 18 are formed integrally to give a filter 12. The frame body 18 is prepared by injection molding of regin through gates 20, 21. Since the gates 20, 21 are so set as to be located at the center parts of both upper and lower lines 18c, 18a, weld lines are produced almost the center parts of both right and left lines of the frame body 18. Consequently, the frame body 18 can be folded easily on the center of the weld lines, so that the filter 12 can be disposed of in a compact size condition.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for ventilation fans in which a filter membrane is integrally provided on a frame formed by injection molding of resin.

0002

2. Description of the Related Art Conventionally, disposable filters for ventilation fans have been provided, which are detachably attached to the front of the ventilation fan body and are discarded when they become dirty due to long-term use of the ventilation fan. An example of such a filter is shown in Figure 6.
Shown below. That is, the filter 1 is formed by integrally molding a filter membrane 3 made of nonwoven fabric or the like onto a rectangular frame 2 made of, for example, ABS resin. The frame body 2 is formed by injection molding, and if the three gates 4, 5, and 6 provided at the positions shown in the figure are used during the injection molding, , the weld line of the frame 2 is the corner of the frame 2 where the resin injected into the mold wraps around and collides with each other to be integrated, and the lower side 2a of the frame and the handle formed parallel to this. It occurs approximately in the center of the portion 2b (each position of the weld line is indicated by arrows A, B, and C).

0003

By the way, when disposing of a disposable filter, it is desirable to dispose of the filter in a compact state by folding it in half so that the filter does not become bulky. However, in the case of the conventional structure described above, since the frame 12 is molded with resin, it is not easy to bend it, and in fact, it is difficult to discard the filter after it is folded in half at the intended location. Met.

The present invention has been made in view of the above-mentioned circumstances, and its object is to provide a frame body made of resin and a filter membrane integrally formed therein, which can be folded in two at a predetermined point in a compact state. To provide a ventilation fan filter that can be disposed of.

[0005]

[Means for Solving the Problems] A filter for a ventilation fan of the present invention has a filter membrane integrally provided on a frame formed by injection molding of resin through a gate, and the frame has a filter membrane formed by injection molding of resin through a gate. The gate positions are set so that weld lines are formed at two positions facing each other with the filter membrane in between.

[0006]

[Operation] When a frame is formed by injection molding of resin through a gate, weld lines are formed on the frame at two positions facing each other with a filter membrane in between. This results in
The frame body can be bent relatively easily at the weld line portion, and the filter can be folded in two and disposed of in a compact state.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. In FIG. 2, which shows the entire ventilation fan in perspective, a filter 12 is fitted on the front surface of the ventilation fan main body 11.

Ventilation fan body 1 with filter 12 removed
1, a motor 13 is attached within the ventilation fan body 11 via a support frame 14, and a blowing blade 15 is attached to the motor 13. In addition, a shutter 16 is provided at the rear opening of the ventilation fan main body 11.
is rotatably provided. And the ventilation fan body 11
A decorative frame 17 is fixed to the front of the decorative frame 1.
The filter 12 is fitted into the hole 7 .

In FIG. 1, which is a perspective view of the filter 12, the filter 12 is constructed by integrally molding a filter membrane 19 made of nonwoven fabric onto a rectangular frame 18. Furthermore, the frame body 18
A handle portion 18b is integrally formed on the lower side 18a.

The frame body 18 is formed by injection molding ABS resin into a molding die (not shown) through the gates 20, 21 shown in FIG. In this case, since the positions of the gates 20 and 21 are set at the center of the upper side 18c and lower side 18a of the frame 18, the resin injected from such gate positions goes around the inside of the mold and flows into the frame 18. They collide and become integrated at a position corresponding to approximately the center of both left and right sides 18d and 18e. Here, as the resin goes around inside the mold in this way, the temperature at its tip decreases, so the left and right sides 18 of the frame 18 where the resin collides and is integrated.
A weld line in which the resin is not completely mixed is formed approximately at the center of d and 18e (the positions of the weld lines are indicated by arrows D and E). In other words, the weld lines are formed at two opposing positions in the frame 18 with the filter membrane 19 in between.

Now, when the ventilation fan is operated for a long time with the filter 12 having the above structure attached to the ventilation fan main body 11, the filter membrane 19 of the filter 12 becomes dirty with oil dust and the like. If the filter membrane 19 becomes dirty beyond the usage limit, the filter 12 is replaced. That is, by pulling the handle portion 18b of the frame 18, the filter 12 is removed from the front surface of the ventilation fan main body 11, and a new filter 12 is attached to the ventilation fan main body 11.

Then, as shown in FIG. 4, the ventilation fan main body 1
1. Hold the upper side 18c and lower side 18a of the frame 18 of the filter 12 removed from the filter 12 with your hands and bend it so that the filter membrane 19 is on the inside. At this time, both left and right sides of the frame 18 1
Since the strength of the parts 8d and 18e where the weld lines are formed is lower than the strength of other parts, when a large force is applied to both the left and right sides 18d and 18e of the frame 18,
As shown in FIG. 5, both left and right sides 18d and 18e of the frame 18
It can be folded in half around the center.

In short, in the case of the above embodiment, the positions of the gates 20 and 21 of the frame 18 are on both the left and right sides 18d, which are opposite to each other.
Since the weld line is formed approximately at the center of the frame 18, the filter 12 can be easily bent around the approximately center of both the left and right sides 18d and 18e of the frame 18. Therefore, the filter 12 can be bent at a predetermined position compared to the conventional example in which weld lines are not formed on opposing sides.

Furthermore, since the filter 12 can be folded in half as described above, the filter 12 can be disposed of in a compact state.

In the above embodiment, the positions of the gates 20 and 21 are set so that a weld line is formed approximately at the center of both the left and right sides 18d and 18e of the frame 18.
Alternatively, the gate position may be set so that a weld line is formed at opposing portions of the upper and lower sides 18c and 18a (including the handle portion 18b) of the frame 18, particularly at approximately the center.

Furthermore, the present invention is not limited to rectangular filters, but may be applied to circular filters.

[0017]

[Effects of the Invention] As is clear from the above description, according to the ventilation fan filter of the present invention, the frame body formed by injection molding of resin through the gate is arranged in two positions facing each other with the filter membrane in between. Since the gate positions are set so as to form weld lines in each case, a filter in which a filter membrane is integrally provided on a resin-molded frame can be folded in half at a predetermined point and disposed of in a compact state. This has the excellent effect of making it possible to

[Brief explanation of drawings]

FIG. 1 is a perspective view of a filter showing one embodiment of the present invention.

[Figure 2] Overall perspective view

[Figure 3] Overall vertical cross-sectional view with filter removed

[
Figure 4: Perspective view showing how the filter is folded

[Figure 5]
Perspective view showing the filter in a folded state

[Figure 6] A diagram equivalent to Figure 1 showing a conventional example

[Explanation of symbols]

11 is the ventilation fan body, 12 is the filter, 18 is the frame, 19
is a filter membrane, and 20 and 21 are gates.

Claims (1)

[Claims] 1. A frame body formed by injection molding of resin through a gate and a filter membrane integrally provided therein, the frame body having welds at two opposing positions with the filter membrane in between. A filter for a ventilation fan, characterized in that the gate position is set so as to generate a line.