JPS6332487B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a filter used in a filtration device for removing particulate matter suspended in a liquid or gas.

Conventionally, various filters have been used to remove suspended particulate matter in liquids or gases, such as paper, cloth, resin, glass, fibrous materials made of metal, sand, gravel, or metal mesh. However, these have not been able to withstand long-term use due to drawbacks such as susceptibility to clogging and poor durability. In addition, as shown in Fig. 6, the filter is made to be strong and durable and can be operated for a long period of time by back washing.
A filter is made by arranging a spacing fixing metal rod B along the axial direction inside a cylindrical shape, and welding the spacing fixing metal wire A and the spacing fixing metal rod B at their respective intersection points. However, due to technical constraints in the manufacturing method, it is impossible to manufacture this filter economically with fine slit spacing uniformly and accurately, and even the finest slit spacing obtained is actually only 50 ~100μ,
There was also a drawback in that the uniformity of the slit spacing was not good. In addition, there is a method in which filter wire is simply space-wound using a polygonal metal tube as the core, but there is no winding machine that can obtain fine slit spacing g with uniform spacing, and even the most accurate winding machine is polygonal. When winding on a metal core, the spacing can only vary by about ±50μ. Similarly, a polygonal metal tube is used as a core body, and a filter wire coated with a resin film is tightly wound on the core body, and then the resin coat film is removed with an appropriate solvent to obtain the slit spacing. A method was also attempted, but this method
It is difficult to apply resin uniformly in a line with a thickness of
This method is not suitable for obtaining uniform slit spacing because it causes a variation in coating film thickness of 10 μm and also causes uneven coating thickness due to uneven thickness. In addition, if the coating film is removed with a suitable solvent, loosening occurs between the core and the filter wire, and the slit spacing shifts, resulting in a disadvantage that it is not possible to obtain accurate and uniform fine slit spacing. be.

The present invention was developed in view of the above points, and its purpose is to maintain uniform spacing between fine slits with high precision, to easily filter and separate fine suspended particles that are difficult to settle during wastewater treatment, etc. Furthermore, the present invention provides a filter that is strong and can be easily unclogged in the slit by backwashing, that filtration work is extremely efficient, has a long life, is suitable for mass production, and is economically extremely inexpensive. It is in. Another objective is to efficiently separate fine suspended particles using a small and inexpensive filtration device without requiring a huge facility such as a settling tank, and to economically reduce liquid processing costs. It is.

The present invention will be explained below with reference to the drawings. 1 to 5 show the structure of a filter obtained by the manufacturing method of the present invention and the manufacturing method of the present invention. FIGS. 1a and 1b are perspective views of the core of a filter constituting the present invention, in which a perforated polygonal metal tube core 1 has a large number of liquid passage holes 2 on each side of the polygonal metal tube. It is formed by distorting the surface inward to form a curved surface 3. Note that the perforated polygonal metal tube core 1 only needs to be triangular or more shaped. Figure 2 a is
A filter wire 4 is attached to the outer periphery of the perforated polygonal metal tube core 1.
2b is a perspective view of the spacer wire 5 and the spacer wire 5 tightly wound together, and FIG. 2b is a partially enlarged sectional view thereof. That is, by closely winding the filter wire 4 having an outer diameter D and the spacer wire 5 having an outer diameter d around the outer periphery of the core body 1 and fixing the wire ends, the slit interval g between adjacent filter wires 4 can be reduced. is held constant. In this case, the slit spacing is sufficiently maintained only by the contact friction between the core 1 and the filter wire 4, but if necessary, it is also possible to weld the gap or to reinforce and fix it with resin or adhesive. Figure 2c shows a welded part 6 between the core 1 and the filter wire 4.
This is an example of what was formed. FIG. 2d shows another example in which a holding wire 7 is arranged on the outside of the filter wire 4 wound with a spacer wire 5 interposed therebetween and perpendicular thereto, and a welded portion 8 is formed at each intersection of both wires 4 and 7. was formed.

Next, a method of winding the filter wire 4 and the spacer wire 5 around the core body 1 will be explained with reference to FIG. When winding the filter wire 4 and the spacer wire 5 around the outer periphery of the core body 1 which rotates around the axis, the winding angle of the spacer wire 5 is set to θ° in the winding direction with respect to the filter wire 4. The spacer wire 5 and the filter wire 4 are wound successively in the longitudinal direction of the core 1 while bringing the spacer wire 5 and the filter wire 4 into close contact with each other. This winding process will be explained in more detail as shown in FIG. 3b. Figure 3 b○… how?

Claims (1)

[Scope of Claims] 1. A concave curved surface is formed on each side of the polygonal metal tube, and a perforated polygonal metal tube core with a liquid passage hole bored in the curved surface is provided with a filter having an outer diameter of D. The wire and a spacer wire with an outer diameter d for maintaining and forming a constant slit interval g between adjacent filter wires are wound closely in a relationship expressed by the following formula, d=(D+g) ² / 4D However, D>d>1/4D After fixing the wire terminals, the spacer wires are dissolved and removed by a chemical method to obtain a filter with a constant slit spacing g between adjacent filter wires. Characteristic filter manufacturing method.