JPH0724227A - Laminated filter made of wire net - Google Patents

Abstract

PURPOSE:To inexpensively produce a filter capable of filtering out minute dust, etc., capable of maintaining high filtering performance for a long time and having high strength. CONSTITUTION:Plural wire net layers 2-6 each consisting of plural wire nets and different from each other in mesh are superposed, flatly compacted and sintered. Since the resulting filter 1 is made thick as a whole, it can filter out even minute dust, etc. By the presence of the large-mesh wire nets 3, 5 each composed of thick wires, the filter 1 can maintain high strength. Since dust is dispersed in the filter 1 by the presence of the large-mesh wire net layers 3, 5, the filter 1 hardly causes blocking and can maintain high filtering performance for a long time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter used for filtering fluids such as various liquids and gases, such as in the case of filtering molten polymer in the production of chemical fibers.

[0002]

2. Description of the Related Art In the case where the dust to be filtered is very small and the pressure of the fluid is high, as in the case of filtering a molten polymer in the production of chemical fibers, the conventional method is very small. Filters made by sintering different powder alloys have been used. However, this sintered alloy filter is expensive because the material cost and the processing cost are high, and moreover, the ratio of metal particles in the total volume is high, and the function of taking dusts inside the filter is low, so Have a tendency to adhere to the surface of the filter and cause clogging, and therefore, it has to be removed from the apparatus and frequently washed again or replaced, which causes a problem of high running cost.

On the other hand, it has been conventionally performed variously to construct a filter by stacking several wire nets. Since the wire net filter is low in material cost and processing cost, it can be manufactured at low cost. Has the advantage to say. However, the conventional wire mesh filter has a structure in which several wire meshes are simply superposed, and therefore cannot be used in a portion for removing fine dusts as in the case of filtering the molten polymer described above. It was

With respect to this point, it is considered that a large number of fine meshes may be overlapped, but the structure in which only a large number of fine meshes are simply overlapped cannot increase the overall strength. Therefore, it cannot be used in places where high pressure acts, and since the entire filter has the same coarseness and the ability to take in dust inside is low, similar to the sintered alloy filter. However, there is a problem in that dust tends to adhere to the surface, which easily causes clogging.

An object of the present invention is to make it possible to inexpensively manufacture a filter capable of filtering minute dusts, maintaining high strength, and less likely to cause clogging.

[0006]

In order to achieve this object, the present invention is directed to stacking a plurality of kinds of wire nets having different mesh roughnesses in a multi-layer structure so that adjacent wire net layers are in close contact with each other. Then, it is configured to be held inseparably.

[0007]

With the above-mentioned structure, since a large number of wire mesh layers are formed as a whole, even minute dusts can be filtered. In that case, since the open-meshed wire mesh layer plays a role of a reinforcing material, high strength can be maintained, and it can also be used in a region where high pressure acts, such as in the case of filtering a molten polymer. .

By the way, in order to maintain the filtering performance of the filter, it is necessary to allow a fluid to pass through while a large amount of dust is taken in the inside of the filter. It is necessary to be able to hold in a dispersed state. However, in the present invention, the presence of the wire mesh layer having a coarse mesh in the filter promotes the uptake of dust into the filter, and the dust taken in the filter is mainly a fine mesh. Since it is efficiently retained in the layer, it is possible to retain dust in a state of being dispersed throughout the inside of the filter, and as a result, it is possible to maintain high filtration performance for a long time.

Since the filter is made of wire mesh,
It can be manufactured at low cost. Thus, according to the invention,
It has an effect that a minute dust can be filtered for a long time and a high-strength filter can be manufactured at low cost.
Further, when a plurality of wire mesh groups formed by weaving the material wire meshes are stacked as described in claim 2, the process of stacking the wire mesh layers can be performed extremely easily, so that the manufacturing cost can be further reduced. Is possible, and moreover,
Since it is possible to prevent or significantly reduce the exposure of the ends of the striations in the wire mesh layer to the peripheral edge of the filter, it is possible to improve safety.

When the wire mesh layers are three-dimensionally woven such as knitted or knitted, as in claim 3, the overlapping wire mesh layers are intricately entangled with each other. The function of retaining the class is improved, and the filtration performance can be further improved. Furthermore, when the wire mesh layers that are overlapped with each other are sintered as in claim 4, the wire mesh layers do not separate from each other due to the pressure during use, and the mesh roughness of the entire filter is kept constant. Therefore, it is possible to maintain the same filtering performance as a sintered alloy filter, and even though it is a wire mesh filter, it does not have to be crimped on the outer peripheral edge with a metal plate ring. Since it is possible to maintain the shape of, it can be handled extremely easily.

[0011]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 8 show a first embodiment, and a filter 1 in this embodiment is composed of five wire mesh groups 2, 3, 4, 5, 6 each consisting of a plurality of wire mesh layers. .

Of these, the first wire netting group 2 forming the upper surface of the filter 1, the third wire netting group 4 located in the middle, and
Three wire mesh groups, the fifth wire mesh group 6 and the fifth wire mesh group 6 forming the lower surface of the filter 1, are composed of fine meshes, and the second wire mesh group 3 and the fourth wire mesh group 5 are composed of coarse meshes. Each wire mesh layer 2,
As shown in FIG. 3, the threads 3, 4, 5 and 6 are stretchable and three-dimensionally woven by knitting or knitting a stainless steel or the like striation 7, respectively.

Further, as shown in FIGS. 4 and 5, the first wire netting group 2 and the fifth wire netting group 6 are formed so as to be connected to each other, and the first wire netting group 2 and the fifth wire netting group 6 are formed. And 1
By forming a continuous state by double-folding a single material wire mesh, the first wire mesh group 2 and the fifth wire mesh group 6
It is in a state of enclosing the other three wire mesh groups 3, 4, and 5.

The second wire netting group 3, the third wire netting group 4 and the fourth wire netting group 5 are each made up of a plurality of layers by folding a single material metal net a plurality of times. The second wire mesh group 3, the fourth wire mesh group 5 and the third wire mesh group 4 are shown in FIG.
Further, as shown in FIG. 6, the strips 10 of the wire mesh groups 3, 4, 5 are arranged so as to intersect each other at an angle of approximately 45 degrees in a plan view.

The filter 1 is composed of wire mesh groups 2, 3, 4,
The wire mesh layers in Nos. 5 and 6 are pressed and solidified so as to be in close contact with each other, and then sintered.
As shown in, the striations 7 in the overlapping wire mesh layers are
The wire mesh layers are intertwined with each other and fixed (FIGS. 4 and 5 show the wire mesh layers in a separated state for convenience of description).

The filter 1 having the above-mentioned configuration is shown in FIG.
As shown in FIG. 3, the filter 11 is used by being loaded in a conduit 12 through which a fluid 11 such as a molten polymer flows and supporting a sand (fine particles) 13 having a filter function, or without being used together with the sand 13. Used in 1 only. In this case, since the entire filter 1 is composed of a large number of wire mesh layers, it is possible to reliably filter minute dusts, while the second wire mesh group 3 and the fourth wire mesh group 5 are provided.
However, since it is formed of a thick wire, high strength can be maintained.

Further, since the second wire netting group 3 and the third wire netting group 4 are coarse, the introduction of dust into the filter 1 is promoted, while the finer third wire netting group 4 and the fifth wire netting group are used. The presence of group 6 prevents debris from coming off. Therefore, it is possible to keep the dusts in a diffused state in the entire volume of the filter 1, and as a result, it is possible to maintain a high filtration capacity for a long time.

Since each of the wire mesh groups 2, 3, 4, 5, 6 is knit-woven, the wire lines 7 of the overlapping wire mesh layers are intricately entangled with each other. It is possible to further improve the function of holding the class. Further, by pressing and pressing and then sintering, the filter 1 can be obtained in the same manner as the sintered alloy filter.
Since the roughness of the mesh as a whole is kept constant, the phenomenon that the overlapping wire mesh layers are separated by the pressure of the fluid 11 does not occur, and not only a constant filtration performance can be maintained, but also the outer peripheral edge The ring body made of a metal plate can be held in a constant shape without being caulked.

In addition, each wire mesh group 2, 3, 4, 5, 6
Since each of them is formed by folding the material wire mesh, it is possible to prevent or significantly reduce the exposure of the end portion of the striation line 10 to the outside of the filter 1, and improve the safety. As in the embodiment, the second and fourth wire mesh groups 3, 5
And the fourth wire netting group 5 are arranged so that the striations 10 thereof intersect at an angle of about 45 degrees in a plan view, the coarseness of the mesh at the contact points of the wire netting groups 3, 4, 5 is made fine. Therefore, there is an advantage that the filtration performance can be further improved.

If the first wire netting group 2 is made of fine mesh as in the embodiment, it is suitable for supporting the sand 13 by the filter 1 as shown in FIG. The filter 1 is manufactured through the steps shown in FIGS. 9A and 9B to FIG. That is, as shown in FIG. 9A, by folding the material wire mesh, each wire mesh group 2, 3, 4,
After forming 5 and 6, as shown in FIGS. 9B and 10, the continuous body 1 including the first wire mesh group 2 and the fifth wire mesh group 6
At 4, the three wire mesh groups 3, 4, 5 are wrapped.

Then, as shown in FIGS. 11 and 12, the filter 1 formed in a rectangular shape in plan view is pushed into the female die 15 of the press machine and then pushed by the male die 16, whereby each wire mesh group is pressed. The wire mesh layers in 2, 3, 4, 5, 6 are pressed and solidified so as to be in close contact with each other. By this press working, a flat plate shape having an appearance similar to that of the sintered alloy filter is formed.

Then, as shown in FIG. 11 (b), the flattened filter 1 is put into a heating furnace and heated to sinter the overlapping wire mesh layers. By the way, as shown in FIG. 9C, it is conceivable that a large number of unit wire nets 17 may be punched out from a raw metal wire net, and the multiple unit wire nets 17 may be stacked and pressed to be sintered. In this manufacturing method, the edge line 10 'of the unit wire net 17 punched out from the material wire mesh comes out and loses its shape, or as shown in FIG. There is a problem that the unitary wire mesh 17 is deformed irregularly due to the residual stress (curving) generated in ′, and it becomes impossible to overlap.

On the other hand, when the wire mesh groups 2, 3, ... Are constructed by folding the material wire mesh as in the present invention, the filter 1 can be easily and easily produced without the above-mentioned problems. It is possible to surely form a multilayered structure. In the second embodiment shown in FIGS. 13 to 14, seven wire mesh groups 2, 3, ... 8 formed in a band plate shape in a plan view are overlapped and pressed by a press machine 18. The plate-shaped body 19 is formed by punching, and then the filter 1 having a desired shape is punched out from the plate-shaped body 19.

In this case, as shown as a third embodiment in FIG. 15, a ring member 20 made of a metal plate is provided around the periphery of the filter 1.
You may crimp. The third embodiment shown in FIG. 16 is
After the cotton-like body 21 made of fine fibers such as stainless steel is wound by the coarse mesh group 9a, the coarse mesh layer 9b is formed.
Was wound up with a fine mesh layer 9b, and then the whole was pressed and solidified by a press machine 18 and then sintered. As apparent from this example, in the present invention, the It may include a part of the filter material that is not a wire mesh.

In the present invention, the number of wire mesh layers, the manner in which the layers are stacked, the mesh roughness of each wire mesh layer, the material of the wire mesh, the number of wire mesh layers in the wire mesh group, etc., are required, It goes without saying that it can be appropriately selected depending on the strength and the like.

[Brief description of drawings]

FIG. 1 is a perspective view of a filter according to a first embodiment.

FIG. 2 is an isolated perspective view showing a superposed state of the wire mesh layers in the filter of FIG.

FIG. 3 is a diagram showing how to weave each wire mesh layer.

FIG. 4 is a schematic sectional view taken along line IV-IV in FIG.

5 is a schematic sectional view taken along line VV of FIG.

6 is a partial plan view taken along line VI-VI of FIG.

FIG. 7 is a diagram showing a state of striations in the filter.

FIG. 8 is a diagram showing a usage state of a filter.

9 (a) and 9 (b) are views showing a processing step of the filter according to the first embodiment, and FIGS. 9 (c) and 9 (d) are views showing comparison with other manufacturing methods.

FIG. 10 is a diagram showing a step subsequent to that in FIG.

FIG. 11 is a diagram showing a step of compacting a filter.

12 is a plan sectional view taken along line XII-XII of FIG.

FIG. 13 is a diagram showing a processing process of the second embodiment.

FIG. 14 is a diagram showing a step subsequent to that in FIG.

FIG. 15 is a sectional view showing a third embodiment.

FIG. 16 is a diagram showing a processing step of the fourth example.

[Explanation of symbols]

 1 Filter 2-9b Wire mesh group 10 Strands 11 Fluid 12 Pipeline 13 Sand

Claims (4)

[Claims] 1. A plurality of kinds of wire nets having different mesh roughnesses are superposed in multiple layers, and each wire netting layer is held inseparably so that adjacent wire netting layers are in close contact with each other. Multilayer filter made of wire mesh. 2. In "Claim 1", the entire wire mesh layer is
A wire mesh laminated filter, characterized in that it is formed by stacking a plurality of wire mesh groups composed of a plurality of wire mesh layers, and each wire mesh group is formed into a plurality of layers by folding a material wire mesh a suitable number of times. 3. In "Claim 1" or "Claim 2",
A wire mesh laminated filter, wherein each of the wire mesh layers is three-dimensionally woven like a knit weave or a knitted weave. 4. In “Claim 1” to “Claim 3”,
A wire mesh laminated filter, characterized in that the wire mesh layers are held inseparable by sintering the wire mesh layers which are overlapped with each other.