JPS5823375Y2 - filter - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a new structure of a filter body.

Filters for air intakes of air conditioners and heaters, filters for cooling water in cooling towers, and filters for lubricating oil and cutting oil sources in industrial machinery often use the first filter.
A filter like the one shown is used.

As this filter, the present applicant previously proposed a filter in which a mesh is integrally molded with a frame made of synthetic resin (including rubber).

This filter is easy to manufacture, cost effective, and durable.

And this conventional filter 1 is molded into mold A as shown in Fig. 2.
and molded using mold B.

At this time, from the vicinity of the contact point between the frame 2 and the net 3 to the center of the net 3 (
In order to prevent the synthetic resin from protruding, the gap between the molds AB and the distance S) in the figure is narrower than the central portion of the net 3 and is formed to be equal to the thickness of the net 3 divided by l.

Therefore, in this part, the mesh 3 is crushed during molding.

■The mold temperature is high because it is close to cavity 4. ■To prevent the formation of flakes on the molded product, the mold A part (arrow in the figure) is at an acute angle at the twilling part where both molds meet. , The net 3 tends to break or burn and become weakened due to the reasons described in (1) to (3) that it is easy to break at this sharp corner.

In addition, such a filter 1 tends to warp easily, although it is not clear whether this is because the mesh 3 stretches and contracts the frame 2 due to temperature changes, and when the filter 1 is placed on a flat plate, some part of the frame 2 always gets distorted. It was easy for parts to rise above the flat plate.

Further, in a filter in which the mesh and the frame are integrally molded, there is an inconvenience that even if a portion of the mesh is torn, the entire filter must be replaced.

Therefore, the inventor of the present invention has completed the present invention as a result of intensive studies to eliminate such drawbacks.

The gist of the present invention is to provide a rubber or synthetic resin type filter in which a net and a frame are integrally molded, in which a thin edge portion integrally formed with the frame is provided on the fluid passage surface side of the net. This is because the thin edge is molded integrally with the net.

The present invention will be explained in detail below based on embodiments shown in the drawings.

FIG. 3 shows the first embodiment of the present invention, in which the upper side of the frame 2 has a semicircular shape, and a net 3 that functions as a filter is integrally formed in the lower straight part.

A thin edge 5 in the shape of an extended straight portion of the frame 2 is provided near the contact point between the frame 2 and the fluid passage surface of the net 3, and the net 3 is also provided on the lower surface of the thin edge 5. Molded in one piece.

In order to mold this example having such a thin edge 5, molding is performed using molds C and D as shown in FIG.

Then, the molten resin after being injected is quickly cooled down at the thin edge portion 5 because it is thin, and the net 3 is not burnt, and there is an advantage that the net 3 is difficult to break because there is no sharp corner.

In addition, not only during molding, the filter frame with this shape is not easily distorted and deformed, and the dust that has accumulated in a part of the corner (arrow a) can be easily and completely removed. Even if the net 3 is pulled in the vertical direction (arrow bc direction), the thin edge 5 also bends accordingly, making it difficult for the net 3 to peel off from the frame 2.

Of course, if the thin edge portion 5 is provided, the bonding area of the thin edge portion 5 alone will be larger than in the conventional case, and it will be more difficult to peel off.

FIG. 5 shows a second embodiment, in which the cross-sectional shape of the frame 2 is L.
The thin edge portion 5 is provided following the straight portion, and has the same effect as the first embodiment.

FIG. 6 shows a third embodiment. In this example, the cross-sectional shape of the frame 2 is a circle, the thin edge 5 is provided on the diametrical extension of the circle, and the net 3 is provided on the lower half of the circumference and the thin wall. It is provided to penetrate through the center of the edge 5.

The thin edge portion 5 is made slightly thicker to serve as a rib, reinforcing the entire filter.

In this example, since the net 3 is integrally molded along the circumference, it has a larger adhesive area than the first example and is less likely to peel off.

In addition to the frame 2 described above, the present invention also includes a core 6 in the frame 2.
It may also be a filter frame with embedded .

It is preferable to embed the core body 6 because it becomes more durable. However, in the conventional frame 2 in which the core 6 is embedded, the net 3 expands and contracts due to temperature differences during use and pulls the frame 2, causing the frame 2 to rotate around the core 6 as shown in FIG. Dimensions l
There is a drawback that the value changes like l'.

On the other hand, in the fourth embodiment of the present invention, as shown in FIG.
The thin edge portion 5 absorbs the expansion and contraction of the frame body 2 and prevents rotation of the frame body 2.

FIG. 9 shows a fifth embodiment, in which the frame body 2 has a circular cross-sectional shape.
A core body 6 is embedded in the center of the frame body 2, and a net 3 is integrally molded on the lower circumference of the frame body 2, and this net 3 is also integrally molded inside the thin edge portion 5 curved in a waveform. .

The center of the core body 6 and the frame body 2 is located on an extension of the fluid passage surface of the net 3.

In this example, not only the corrugated thin edge 5 is provided, but also the centers of the core body 6 and the frame body 2 are located on an extension of the fluid passage surface of the net 3.

Therefore, when the net 3 expands or contracts, it is absorbed by the thin edge portion 5, and even if it cannot be completely absorbed, the frame 2 is difficult to rotate.

In the fourth and fifth embodiments, unlike the conventional core 6 embedded filter frame 2, the dimension l changes and the filter 1 cannot be removed and installed smoothly from the machine during cleaning. No.

As explained above in the first to fifth embodiments, according to the present invention, the thin edge portion formed integrally with the frame is provided on the fluid passage surface side of the net, and the thin edge portion is formed integrally with the net. Therefore, when the net is attached to the frame, the vicinity of the roots is less likely to be damaged, and as a result, the durable life of the filter in which the net and the frame are integrally formed can be increased.

In addition, by giving a certain thickness to the thin edge,
It is also possible to strengthen the filter by giving it the function of a rib.

The filter frame of this invention is made of synthetic resins such as polyethylene, polypropylene, polyvinyl chloride, polyurethane,
It is molded from rubber such as natural rubber or synthetic rubber, and the net is molded from not only the above-mentioned synthetic resins but also synthetic resins such as nylon resin and polyester resin, as well as metals such as iron, copper, and aluminum.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a filter, FIG. 2 is a cross-sectional view showing a conventional filter frame during molding, FIG. 3 is a perspective view showing a part of the first embodiment of the present invention, and FIG. The figure is a sectional view showing the state of molding on the same side, FIG. 5 is a perspective view showing one part of the second embodiment, and FIG. 6 is a perspective view showing one part of the third embodiment. FIG. 7 is a sectional view showing a conventional filter frame, FIG. 8 is a sectional view showing a part of the fourth embodiment of the present invention, and FIG. 9 is a perspective view showing a part of the fifth embodiment. .

Claims (1)

[Scope of utility model registration request] 1. In a rubber or synthetic resin type filter in which the net and frame are integrally molded, a thin edge formed integrally with the frame is provided on the fluid passage surface side of the net, and the thin edge is integrally molded with the net. A filter characterized by: 2. The filter according to claim 1, wherein the thin edge portion is curved in a waveform in a cross section.