JPH0771761A - Manufacture of filter, filter, and gas apparatus including the filter - Google Patents

Abstract

PURPOSE:To provide a method of fabricating a filter wherein the filter composed of a mesh and a packing integrally provided thereon is automatically fabricated and wherein many filters can be fabricated. CONSTITUTION:A metal plate is etched and a mesh sheet S is molded to couple meshes 10 by keeping a relative position of a plate member 16 with respect to the mesh sheet. Then, the mesh sheet S is set to a mold 20 which is in turn clamped. A plurality of mold holes 22 formed in the mold 20 are disposed so as to face the meshes 10 when a protrusion 21 of the mold 20 is inserted into a positioning hole 15 in the mesh sheet S. Hereby, the need of fine positioning is eliminated and automation is ensured. Then, rubber is infected into the mold holes 22 in the clamped mold 20 and a packing is molded on the outer circumference of the meshes 10. Further, the mold 20 is opened and the branch member 16 is cut. Hereby, many filters composed of the meshes 10 and the packing integrally molded thereon are fabricated at a stretch.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a filter installed in a pipe for removing foreign matters contained in a fluid flowing in the pipe, a filter, and a gas appliance equipped with the filter.

[0002]

2. Description of the Related Art As shown in FIG. 8, a filter 3 is provided at a joint between a connecting pipe 30 of a gas burner portion of a gas stove and a supply pipe 34 which is connected to the connecting pipe 32 and supplies gas.
6 are provided. The filter 36 filters foreign matter mixed in the gas so that the foreign matter does not flow to the gas burner section.

By the way, the conventional filter 36 is a metal mesh 38 obtained by punching a sheet woven from a wire rod into a circular shape.
And the ring-shaped rubber packing 40 were separately manufactured, and were set in the supply pipe 32 by overlapping.

However, the filter 36 constructed separately as described above requires two steps for the installation work, which lowers the work efficiency. Moreover, the outer peripheral portion of the metal mesh 38 was bulged and the metal meshes 38 were entangled with each other, which was inconvenient in handling.

Also, by molding a nylon mesh,
After that, there is also one in which the outer peripheral portion is subjected to fusing processing and edging to prevent the meshes from being entangled with each other, but it takes a lot of time and effort to manufacture the mesh, which causes an increase in cost.

Therefore, as shown in FIG. 9, a method in which a metal mesh 38 punched out in a circular shape is set in a mold 42 for packing molding and the filter 44 is integrally formed is possible. It is difficult to place the 38 accurately in the mold 42, and there are technical problems in automation. Further, it is conceivable to directly punch a sheet woven with a wire rod into a circle in the mold, but this is technically difficult as in the above case.

Further, in the case of the metal mesh 38 woven with a wire material, a gap is created in the mold 42 due to the unevenness of the surface, and a packing material such as rubber penetrates into the metal mesh 38 through the gap to form the metal mesh. 38 had the drawback of clogging.

Further, in the case of the metal mesh 38 woven with a wire rod, the filter holes are usually formed in a rectangular shape. For this reason, when the maximum outer diameter and the minimum outer diameter are different, such as foreign matter mixed in gas, foreign matter of a size that should not be passed may be passed depending on the passing angle with respect to the filter hole, which may damage the gas appliance. there were.

[0009]

SUMMARY OF THE INVENTION In consideration of the above facts, the present invention makes it possible to automate the production of a filter in which a mesh and a packing are integrated, so that a large number of pieces can be obtained.
Furthermore, it aims at obtaining the filter suitable for a gas appliance.

[0010]

According to a first aspect of the present invention, there is provided a method for producing a filter comprising a mesh portion and a frame portion surrounding the outer periphery of the mesh portion, wherein a metal plate is etched. , A first step of forming a mesh sheet composed of a plurality of mesh parts and a connecting member for holding the relative positions and connecting the mesh parts to each other; and a plurality of mold holes corresponding to the mesh parts. The second step of setting the mesh sheet in the formed mold and clamping the mold, and injecting the frame material into the mold hole of the mold that has been clamped to mold the frame around the outer periphery of the mesh. And a fourth step of opening the mold, taking out the mesh sheet having the frame part molded on the outer periphery of the mesh part, and cutting the connecting member. There is.

According to a second aspect of the present invention, there is provided a filter comprising a mesh formed by etching a metal plate and a packing surrounding the outer periphery of the mesh.

The filter according to claim 3 is characterized in that the mesh and the packing are circular.

A gas appliance according to a fourth aspect of the present invention is a gas appliance comprising a circular mesh formed by etching a metal plate to form a plurality of circular holes as filter holes, and a packing surrounding the outer periphery of the mesh. It is characterized by being installed in the gas pipe.

[0014]

In the first aspect of the invention, in the first step, the metal plate is etched to form the mesh sheet for connecting the mesh parts with each other by holding the relative positions of the connecting members. Next, in the second step, the mesh sheet is set in the mold and the mold is clamped. The plurality of mold holes formed in the mold are arranged so that the mesh portion and the mold holes face each other when the mesh sheet is set in the mold. For this reason, fine alignment is not necessary and automation is possible.

In the third step, the frame material is injected into the mold cavity of the mold that has been clamped, and the frame is formed on the outer periphery of the mesh part. In the fourth step, the mold is opened, the mesh sheet having the frame formed on the outer periphery of the mesh is taken out, and the connecting member is cut. As a result, a large number of filters in which the mesh portion and the frame portion are integrally formed can be manufactured at one time.

According to the second aspect of the invention, since the mesh is formed by etching a metal plate, it does not entangle and entangle.

Further, in the invention according to the third aspect, the mesh and the packing are circular and can be used as a filter for a cylindrical pipe such as a gas pipe.

Further, in the invention according to claim 4, since the filter hole is processed into a circular hole, even if the maximum outer diameter and the minimum outer diameter are different, such as foreign matter mixed in gas,
Irrespective of the passage angle, all foreign matter having an outer diameter larger than the inner diameter of the circular hole is filtered. For this reason, a foreign matter of a size that should not originally pass through does not damage the gas appliance.

[0019]

EXAMPLE A procedure of a method of manufacturing a filter according to this example will be described with reference to FIGS.

As shown in FIG. 1, a metal plate 12 is used as a material for the mesh 10 (see FIG. 2). The surface of the metal plate 12 is, as shown in FIG. 2, a mesh 10 whose outer peripheral portion is edged, a frame-shaped frame 14, and the frame 14.
A branch material 1 supported by the and connecting the circular meshes 10 to each other.
The part corresponding to 6 is covered with a film having high adhesion.

Next, the metal plate 12 is chemically corroded and partially etched. By this etching process, the portion not covered with the film is attacked by the etching solution, and the mesh sheet S is formed as shown in FIG.

Next, as shown in FIG.
(See FIG. 5) Mesh sheet S into mold 20 for molding
Set. At this time, if the positioning hole 15 of the frame portion 14 of the mesh sheet S is inserted into the protrusion 21 of the mold 20, the center of the mesh 10 and the center of the mold hole 22 can easily coincide with each other. Can be done easily,
Automation is possible.

When the mesh sheet S is set, rubber is injected into the mold cavity 22 to form the filter 24 in which the circular mesh 10 and the ring-shaped packing 18 are integrated.

As shown in FIG. 4, a plurality of the filters 24 are connected by the branch members 16. The filter 24 connected by the branch material 16 is put into a press mold to
By punching with a pin 26, each filter 24 is separated as shown in FIG. 5, and a single product is obtained. Note that, as shown in FIG. 7, the filter 24 may be put into a press die in which the frame portion 58 is formed, and the branch member 16 may be cut by punching the filter 24 with a cylindrical punching member 60.

Further, since the mesh 10 formed by the etching process has the outer peripheral portion edged (see FIG. 2),
It is easy to handle, even when manufacturing the filters 24 one by one as in the conventional case, without the need to offer them.

Although the mesh 10 is made of metal in this embodiment, it is of course possible to chemically or electrically corrode the resin to manufacture the resin mesh. Also, the packing 18 is not limited to rubber, but may be resin.

Next, the filter attached to the gas appliance will be described. As shown in FIG. 6, a filter 50 is arranged at the joint between the connection pipe 30 of the gas burner portion of the gas stove and the supply pipe 34 that is connected to the connection pipe 32 and supplies gas. The filter hole 54 of the mesh 52 of the filter 50 is formed into a circular shape by etching. In this way, by utilizing the etching process, the circular filter hole 54 with high dimensional accuracy can be formed. Further, the ring-shaped packing 56 is integrally formed with the mesh 52 by the manufacturing method described above.

In the gas appliance using such a filter 50, even if foreign matter has a maximum outer diameter and a minimum outer diameter,
Irrespective of the passage angle, all foreign matter having an outer diameter larger than the inner diameter of the filter hole 54 is filtered. For this reason, foreign matter of a size that should not originally pass through does not damage the gas appliance.

[0029]

Since the present invention has the above-mentioned structure, the filter having the mesh and the packing integrated can be automated and a large number of filters can be obtained. In addition, since the foreign matter having a predetermined size is reliably filtered, the gas appliance is not damaged.

[Brief description of drawings]

FIG. 1 is a perspective view showing a procedure of a method for manufacturing a filter according to this embodiment.

FIG. 2 is a perspective view showing a procedure of a method for manufacturing a filter according to this embodiment.

FIG. 3 is a perspective view showing a procedure of a method for manufacturing a filter according to this embodiment.

FIG. 4 is a perspective view showing a procedure of a method for manufacturing a filter according to this embodiment.

FIG. 5 is a perspective view showing a procedure of a method for manufacturing the filter according to the present embodiment.

FIG. 6 is a cross-sectional view showing a filter arranged between a connection pipe and a supply pipe of the gas appliance according to the present embodiment.

FIG. 7 is a perspective view showing a modified example of the method for manufacturing the filter according to the present embodiment.

FIG. 8 is a cross-sectional view showing a conventional filter.

FIG. 9 is a perspective view showing a conventional filter manufacturing method.

[Explanation of symbols]

 10 mesh 14 frame 16 branch material 22 mold 26 pin S mesh sheet 52 mesh 54 filter hole

Claims (4)

[Claims] 1. A method of manufacturing a filter comprising a mesh portion and a frame portion surrounding the outer periphery of the mesh portion, wherein a metal plate is subjected to an etching process to retain a relative position with respect to the plurality of mesh portions. A first step of forming a mesh sheet composed of a connecting member for connecting parts, and setting the mesh sheet in a mold having a plurality of mold holes corresponding to the mesh part and clamping the mold. Second
A step of injecting a frame material into a mold hole of the mold that has been clamped, and molding the frame around the outer periphery of the mesh part; and opening the mold to open the mesh part. And a fourth step of taking out the mesh sheet having the frame portion formed on the outer periphery thereof and cutting the connecting member. 2. A filter comprising a mesh formed by etching a metal plate and a packing surrounding the outer periphery of the mesh. 3. The filter according to claim 2, wherein the mesh and the packing are circular. 4. A filter comprising a circular mesh in which a plurality of circular holes are formed as a filter hole by etching a metal plate and packing which surrounds the outer periphery of the mesh is installed in a gas pipe. Characteristic gas appliances.