JPS6058220A - Filter - Google Patents

Abstract

PURPOSE:To make it possible to repeatedly use a filter many times by changing a mesh size or a ventilation degree during use even if the filter is not exchanged, by forming a filter part by using a fine wire material comprising a shape memory alloy. CONSTITUTION:a filter 1 is formed by using a fine wire material comprising a shape memory alloy having shape memory effect and formed into a reticulated shape to be entirely subjected to shape memory treatment. A filter 1' obtained by the compression deformation of this filter 1 is arranged to the predetermined position in a fluid pipe 3. Subsequently, a fluid is filtered while passed through the pipe 3 and, when clogging is generated, this filter 1' is taken out and heated to a predetermined temp. The treated filter 1' is returned to the shape subjected to shape memory treatment and clogged impurity particles are removed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filter used for any of the four purposes, filtration of specimens or liquids, separation or removal of foreign substances, classification of powders, etc.

Conventionally, when separating or classifying substances, methods using static electricity, magnetism, centrifugal force, etc. are sometimes used, but one of the simplest methods is to use a filter (filter, etc.).
There is a method using a sieve, etc.).

Conventionally, such filters include porous sintered bodies such as metals and ceramics, porous plastics, mesh bodies,
Fiber aggregates are used, but in any case, the roughness, air permeability, etc. of the fibers are constant, and it is not possible to change the roughness or air permeability during the process unless they are replaced. In addition, as the filters gradually become clogged, their mesh or air permeability becomes substantially smaller, and in such cases, it is necessary to replace the filter with a new one to avoid problems caused by clogging. .

This invention was made in view of the above-mentioned conventional circumstances, and it is possible to change the roughness, air permeability, etc. during use without replacing it, and even if clogging occurs during use, it can be completely removed. You can easily clear the blockage,
The purpose is to provide a filter that can be used repeatedly.

That is, the filter according to the present invention has a thin wire material (thin wire shape and long wire material) made of a shape memory alloy having a shape memory effect.
Contains short fibers. ) is characterized in that the filter section is constructed using partially or entirely.

The thin wire material made of shape memory alloy constituting the filter according to the present invention includes, for example, Ti-Ni alloy, Cu-
An-Ni alloy, Cu-An-Zn alloy, Cu-
There are thin wire materials made of Z'n alloys, Ni--Al alloys, etc., and the thin wire materials used are those in the shape of elongated lines or rods, and those in the form of long fibers or short fibers.

FIG. 1 and FIG. 2 show one embodiment of the present invention.
The figure is a perspective view showing a filter according to an embodiment of the present invention, and this filter 1 is made of a mesh body having a cylindrical shape in appearance, and this filter 1 is made of a shape memory alloy having a shape memory effect. It is constructed by using a thin wire material 2 and assembling a ring-shaped outer peripheral thin wire material 2a, a vertical thin wire material 2b, and a horizontal thin wire material 2C. The shape memory alloy constituting this filter 1 can be shaped as a whole into a shape memory process as shown in the figure. Alternatively, the horizontal thin wires 2C may be formed by using shape memory treated linear wires and combining them into a net shape.

Note that the shape memory treatment at this time is performed by performing martensitic transformation treatment at a low temperature according to a conventional method.

Next, the filter 1 made of a mesh shown in FIG. 1 is compressed and deformed to match the inner diameter of the fluid pipe 3 shown in FIG. Set up

When a liquid or gas is passed through the fluid pipe 3 in this state, impurity particles and the like that may be present in the liquid or gas during long-term use are trapped by the compressed filter 1'. When the filter 1' gradually becomes clogged with these impurity particles and needs to be replaced, the filter 1' is taken out and then heated to a predetermined temperature. As a result of this heating, the compressively deformed filter 1' returns to the shape that has been subjected to the shape memory treatment as shown in FIG. 1, the impurity particles fall under their own weight or easily fall by applying vibration or the like. In addition, if impurity particles are attached, they are removed by appropriate cleaning. After cleaning in this way, when reusing the filter 1 shown in FIG. 1, the filter 1 shown in FIG.
' is arranged at a predetermined position in the fluid pipe 3.

3 and 4 show other embodiments of the invention, t
The fJ3 diagram is a diagram according to another embodiment of the present invention.
H −+ ,,l h* '4 噌 is a large number of holes 14a
A large number of fibrous d-thin wires 12 made of a shape memory alloy are vertically planted on one side of a substrate 14 having a shape memory alloy. In this case, the thin wire 12 has been subjected to shape memory treatment in a straight state. Moreover, as for this thin wire material 12, the ratio a/b of the major axis length a and the minor axis length b of the cross section is 10.
It is more desirable to use a fiber whose length L is L/'iT≧10.

Therefore, when the filter 11 is used as a filter, as shown in FIG.
The filter 11 is deformed so as to come into close contact with the surface of the fluid pipe 13, and in this state, the filter 11 is disposed at a predetermined position of the fluid pipe 13. Therefore, when the fluid flows in the direction of the arrow in this state, the impurity particles contained in the fluid are caught by the mmI-shaped thin wire material 12, and the fluid that has passed through the thin wire material 12 is trapped in the holes 14 of the substrate 14.
a to the left in the drawing.

Next, when the filter 11 becomes clogged so much that it becomes necessary to replace it, the 417 no.
Heat to a shape recovery temperature of 12 degrees. Therefore, each thin wire 12 returns to its original upright state as shown in FIG. 3, so that impurity particles and the like stuck to the thin wire 12 can be removed very easily. - When reusing the thin wire 12
After being bent again along the surface of the substrate 14, it is placed in a predetermined position in the main pipe 13.

FIGS. 5 and 6 are diagrams showing still another embodiment of the present invention, in which the filter according to the present invention is used as a sieve.

That is, in this embodiment, the thin wire material 22 made of a shape memory alloy constituting the filter 21 has, for example, a rectangular (square) shape after being subjected to shape memory treatment as shown in FIG. be. Each of the rectangular thin wire rods 22 is connected to each other by a connecting ring 25 at a portion of each corner to form a net shape.
The upper and lower ends and a part of the left end corner of the net-like body are movably connected to the upper and lower and left side frames 27 by another connecting ring 26. In addition, the lower frame 27 has coupling rings 28 attached to the frames 27° 27 on both the left and right sides.
．． 28. It is attached so that it can be moved freely by
Furthermore, the right end side of the net-like body is locked to one end of the tension spring 30, and the other end of the tension spring 30 is connected to the right frame 2.
7, and the net-like body is always pulled rightward by a tension spring 30. Therefore, when the net-like body is heated to the shape recovery temperature, the thin wire 22 resists the tension of the tension spring 30 and becomes rectangular (as shown in FIG. 5).
(square), and at temperatures other than the shape recovery temperature,
As shown in FIG. 6, the net-like body is pulled rightward by the tension spring 30 and deformed, so that the thin wire 22 has a diamond shape.

Therefore, when using this filter 21 to separate substances in a liquid, for example, if you want to separate even relatively small substances, the liquid can be passed through the filter 21 at room temperature, and the filter 21 can be shaped as shown in FIG. Since the mesh of the filter 21 is relatively fine, even relatively small particles in the liquid can be separated. On the other hand, when it is desired to separate a relatively large substance contained in a liquid, the liquid is heated to the shape memory recovery temperature of the thin wire material 22, the thin wire material 22 is made into a rectangular shape as shown in FIG. to flow. In this way, by changing the temperature of the liquid, the roughness of the filter 21 changes due to the interaction between the shape memory effect of the thin wire material 22 and the tensile force of the tension spring 30. The selection criteria based on the size of the substance contained therein can be changed as appropriate.

FIG. 7 is a diagram showing still another embodiment of the present invention, in which this filter 31 is formed into a disc shape by intertwining fibrous thin wire material 32 made of a shape memory alloy, and in this shape is heated at a predetermined temperature. It has shape memory.

Therefore, when using this filter 31, compression deformation is applied to reduce the diameter and wall thickness of the filter 31 in accordance with the diameter or thickness of the filter mounting portion, and then this compressed deformation filter is not shown. Install it on the filter installation part.

Next, when the filter becomes clogged with dust or foreign particles captured during use, the filter is taken out and heated to a predetermined shape memory recovery temperature. Therefore, as the string-like fine wire material 32 returns to its shape in each # constituting the filter by this heating, the captured dust, foreign particles, etc. are removed during these movements.

As explained above, the filter according to the present invention is
Since the filter section is partially or entirely constructed using thin wire material made of a shape memory alloy that has a shape memory effect, even if it becomes clogged during use, it can be cleared very easily. It is possible to reuse the filter, and it has very excellent effects in that it is also possible to change the texture, air permeability, etc. of the filter as appropriate.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a filter according to an embodiment of the present invention;
2 is a partially exploded perspective view of the filter shown in FIG. 1 attached to a fluid pipe, FIG. 3 is a side view of a filter according to another embodiment of the present invention, and FIG. 4 is a view of the filter shown in FIG. 3. FIGS. 5 and 6 are explanatory side views of a 4-J digit state taken into a fluid pipe; FIGS. 5 and 6 are explanatory views of a filter according to still another embodiment of the present invention when the coarseness is enlarged and reduced, respectively; FIG. FIG. 3 is a perspective view of a filter in still another embodiment of the invention. 1.11, 21.31... Filter, 1'... Compressively deformed filter, 2.12, 22.32... Thin wire material made of shape memory alloy. Patent Applicant Daido Steel Co., Ltd. Representative Patent Attorney Yutaka Oshio Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure i or Figure 6

Claims (4)

[Claims] (1) A filter characterized in that the filter portion is constructed using a thin wire material made of a shape memory alloy having a shape memory effect. (2) The filter according to claim (1), wherein the filter portion is made of a network of fine wires made of a shape memory alloy. (3) The filter according to claim (1), wherein the filter portion is made of a fiber aggregate of fine wire material made of a shape memory alloy. (4) The thin wire material has a cross-sectional major axis length a and a minor axis length b ratio a/b of 10 or less, and the length L is L/b.
Claim No. 1 (1) consisting of fibers with Fi≧10
) or (3).