JP2002001026A - Filter element used for precoat filtration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filter element used for precoat filtration capable of easily maintaining a micro spacing between adjacent material wires. SOLUTION: The filter element used for the precoat filtration is characterized in that the wires are wound in coil 1 state and an interstice 9 is formed between adjacent wires of the coil 1 by interposing a thin plate 2 between the adjacent wires.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter element used for precoat filtration for filtering impurities present in a liquid using a filter aid. It can be used for filtration of general household water and drinking liquid, as well as liquid filtration of high-temperature water, high-temperature oil, and chemicals, which are unsuitable for general cartridge filters.

[0002]

2. Description of the Related Art Conventionally, the following is known as a coil spring type filter element. 1) There is a material in which several grooves are formed on the outer periphery of a material wire forming a coil, the material wire is wound in a coil shape, and the outer periphery is pre-coated with a filter aid. This filter element must be subjected to secondary processing to form a groove in the material wire, and it requires advanced technology to form the groove, and twists the material wire when winding it into a coil. However, special equipment (machine) is required and the production cost is high, and the torsion of the material wire becomes a point of contact between the material wires, making the shape of the coil unstable. It was necessary to stabilize the coil shape by inserting a hollow tube core metal inside. In addition, since impurities easily adhere to the groove of the material wire,
The backwash effect of removing impurities adhering to the grooves during backwash was poor. 2) In some cases, projections are provided at regular intervals on a part of the outside of a material wire forming a coil, the material wire is wound in a coil shape, and the outer periphery is precoated with a filter aid. This filter element has an oval cross section that is not circular but has two parallel surfaces because fine projections must always be placed in a fixed direction when the material wire is wound in a coil shape. It must be wound in a coil shape while keeping the projections in a fixed direction using two parallel surfaces as guides. Therefore, projections must be provided at regular intervals outside the material wire, or secondary processing has to be performed to make two surfaces of the material wire cross-section parallel. 3) A material wire is applied to the core metal of the hollow tube for forming the coil.
In some cases, the wire is wound in a coil shape while maintaining a fine interval between the material wires, and the outer periphery thereof is pre-coated with a filter aid, and the minute interval between the material wires is used as a filtrate inflow path. This filter element requires the material wire to be wound around the core metal while maintaining the fine spacing at equal intervals, so a special device (machine) with high precision is required, the production cost is high, and the fineness between the material wires is high. Because of the high precision with the interval maintained, the surface is easily damaged during cleaning, and brush cleaning cannot be performed. Therefore, an expensive cleaning device such as non-contact cleaning is required.

[0003]

In the case of a coil material wire in which grooves are formed or in which protrusions are provided at regular intervals, the material wire must be subjected to precise secondary processing. It was not suitable for high-mix low-volume production because of the demand for raw materials.

[0004] In any of the conventional filter elements, the contact portion is a point and a line, and the size and length of the coil are limited due to the fact that the coil is wound around the core of the hollow tube in a coil shape. However, there is a problem in that the mounting method cannot be arbitrarily selected, and the mounting method using the cored bar is screw-in, so it is not easy to attach and detach, and cannot be mounted on a commercially available cartridge filter housing.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, makes it possible to easily maintain the fine spacing between the material wires, and makes it compatible with commercially available cartridge filter housings and enables selection according to the application. Another object of the present invention is to provide an inexpensive liquid filtration filter element used for precoat filtration, which can increase the filtration area by joining large-diameter filter elements and can also produce a large variety of products in small quantities.

[0006]

According to the first aspect of the present invention, a wire is wound in a coil shape, and a gap is formed between adjacent wires by interposing a thin plate between adjacent wires of the coil. The present invention relates to a filter element used for precoat filtration, wherein a gap of a certain size is maintained between adjacent wires of a coil by the interposition of a thin plate.

According to a second aspect of the present invention, a thin plate projection is formed radially from an annular plate having a diameter smaller than that of the coil, and the thin plate projection is interposed between adjacent wires of the coil. According to the filter element used for precoat filtration according to claim 1, the diameter of the coil can be arbitrarily selected, and the coil can be kept in a stable state.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an example of an embodiment of the present invention, and FIG. 2 is a front view of FIG. 1, in which a plate 2 is interposed between wires forming a spiral of a coil 1. And
A cap-shaped holding member 3 that is in close contact with the outer periphery of the coil 1 is fitted around the outer periphery of the upper end and the lower end of the coil 1 to form a filter element 4.

FIG. 5 is a front view showing an example of the coil 1, in which a commercially available elastic wire or the like is wound in a coil shape, and the material of the wire can be appropriately selected.

FIG. 6 is a plan view showing an example of the plate 2, and FIG. 7 is a front view of FIG. 6. The plate 2 has an annular portion 6 having a circular center hole 5. The outer diameter of the annular portion 6 is smaller than the inner diameter of the coil 1 described above, and a protrusion 7 extending radially from the annular portion 6 in all directions is formed. As shown in FIG. Is made of a thin plate having a thickness of 8.

As shown in FIG. 8, the plate 2 is interposed between adjacent wires of the wire forming the spiral of the coil 1, and the center of the annular portion 6 of the plate 2 is the coil as shown in FIG. When the center is substantially coincident with the center of the coil 1, the projecting portions 7 of the plate 2 are inserted between the adjacent wires of the coil 1. When the coil 1 is compressed from above and below in this state as shown in FIG. 9, the gap 9 between the wires forming the spiral of the coil 1 becomes equal to the plate thickness 8 of the plate 2 shown in FIG. Since each wire of the coil 1 comes into close contact with the plurality of flat protrusions 7, the coil 1 can maintain a stable wound state. Then, the interval 10 between the protruding portions 7 shown in FIG. 4 becomes the passage passage gap width of the filtered liquid.

If the outer diameter of the coil 1 is large, the interval 10 between the projections 7 shown in FIG. 4 becomes large and the gap 9 between the wire rods becomes unstable (see FIG. 9). As the plate 2 to be used, as shown in FIG. 12, a plate having a large diameter of the center hole 5 and the annular portion 6 and a large number of projecting portions 7 is used.

FIG. 10 is a plan view showing an example of the presser bar 11. The presser bar 11 presses the coil 1 from the inner diameter side as shown in FIG. 1, FIG. 2 and FIG. Thus, the winding wire of the coil 1 is stabilized.
As shown in the plan view of FIG.
Is provided with a through-hole 12 for fitting and fixing the end portion. 1 and 3, a female screw hole 13 is provided at the center of the holding metal fitting 3, and a connection pipe 15 having a male screw 14 engraved on the outer periphery as shown in FIG. You can do it.

As shown in FIG. 8, the plate 2 is interposed between the adjacent wires of the coil 1, and as shown in FIG. 1 and FIG. By compressing from above and below, the wire of the coil 1 and the protruding portion 7 of the plate 2 are brought into close contact with each other, and the through hole 12 of the holding member 3 (see FIG. 3)
When the end of the holding rod 11 is fitted and fixed to the filter element 4, the filter element 4 shown in FIGS. 1 and 2 is assembled.

FIG. 13 is a longitudinal sectional view showing an example of a use state of the above-described filter element 4, and FIG. 14 is a plan view of FIG. 13, in which a mounting bolt 17 is screwed into a filter mounting portion 16 of the filter housing from below. The packing 18 is placed on the upper end of the filter element 4 and inserted from below the mounting bolt 17, and the packing 18 placed on the upper end of the filter element 4 contacts the lower edge of the filter mounting portion 16. Then, the packing 19 is applied to the lower end of the filter element 4, the center hole 21 of the holding plate 20 is fitted to the lower end of the mounting bolt 17, and the packing 19 is pressed by the holding plate 20 from below.
The nut 22 is screwed into the lower end of the nut.

Thus, the filter element 4
Is attached to the filter mounting portion 16 of the filter housing, and then the filter aid 23 is attached to the outer surface of the coil 1. As the method, the filter mounting unit 16
A required amount of a filter aid is put in a filter housing (not shown) above the filter housing beforehand, and a precoat liquid is fed by a pump or the like, or a precoat tank is provided outside the filter housing. There is a method in which an auxiliary agent and a liquid for precoating are added and stirred to form a precoat liquid, and the precoat liquid is circulated by a pump or the like. As a filter aid, diatomaceous earth and a liquid to be filtered using diatomaceous as a main agent, pulp powder, activated carbon powder, and barley powder are used as additives suitable for the purpose of filtration.

When the liquid to be filtered is passed through the filter element 4 as shown by the arrow in FIG. 13, the liquid passes through the layer of the filter aid 23 and passes through the gap 9 between the wires of the coil 1.
(See FIG. 9), the filter enters the inside of the filter element 4, passes between the coil 1 and the mounting bolt 17 and
From the opening of the holding member 3 at the upper end, the filter mounting portion 16
And flows out to a filter housing (not shown).

Since the coil 1 is pressed from the inner diameter side by the pressing rod 11 so as not to bend to the side, it is not necessary to use a conventional hollow tube core, and the backwashing effect is also eliminated. Are better.

FIG. 15 is a longitudinal sectional view showing another example of the embodiment of the present invention, and FIG. 16 is a longitudinal sectional view showing a use state of the embodiment shown in FIG. 15, in which two filter elements 4 are connected. The capacity is increased by expanding the filtration area,
1 and 13 are denoted by the same reference numerals. In FIG. 15, the connection pipe 15 shown in FIG. 11 is screwed into the female screw hole 13 at the center of the holding members 3, 3 of the two filter elements 4, and the packing 24 is fitted on the mating surface of the holding members 3, 3. The interposition prevents impurities from entering. And FIG.
As shown in (1), the filter may be attached to the filter mounting portion 16 of the filter housing using a long mounting bolt 17.

[0021]

The first and second aspects of the present invention have the following effects. 1) Since there is no need to perform secondary forming such as providing grooves or protrusions on the coil wire, the coil material is not particularly limited and selection is easy, and the outer diameter of the coil wire can be arbitrarily selected, and manufacturing is possible. It can be manufactured easily and inexpensively. 2) It is possible to produce a large variety of products in small quantities, and it is easy to increase the capacity by increasing the filtration area by joining them together, and it can be mounted on a commercially available filter housing and is compatible with cartridge filters. 3) Since a hollow tube core for stabilizing the coil is not required, the backwashing property is excellent, filtration time is increased, and mounting is easy because there is no hollow tube core.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an example of an embodiment of the present invention.

FIG. 2 is a front view of FIG.

FIG. 3 is a plan view of FIG. 1;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 1;

FIG. 5 is a front view showing an example of a coil.

FIG. 6 is a plan view showing an example of a plate.

FIG. 7 is a front view of FIG. 6;

FIG. 8 is a front view showing a state where a plate is interposed between coils.

FIG. 9 is a longitudinal sectional view of FIG.

FIG. 10 is a plan view showing an example of a holding rod.

FIG. 11 is a longitudinal sectional view showing an example of a connection pipe.

FIG. 12 is a plan view showing another example of the plate.

FIG. 13 is a longitudinal sectional view showing an example of a use state of the embodiment of the present invention.

FIG. 14 is a plan view of FIG.

FIG. 15 is a longitudinal sectional view showing another example of the embodiment of the present invention.

FIG. 16 is a longitudinal sectional view of the use state of the embodiment shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coil 2 Plate 3 4 Filter element 5 Center hole 6 Annular part 7 Projection part 8 Plate thickness 9 Gap 10 Gap 11 Holding rod 12 Through hole 13 Female screw hole 14 Male screw 15 Connection pipe 16 Filter mounting part 17 Mounting bolt 18 Packing 19 Packing 20 Holding plate 21 Center hole 22 Nut 23 Filtration aid 24 Packing

Claims (2)

[Claims] 1. A filter element used for precoat filtration, wherein a wire is wound in a coil shape, and a gap is formed between adjacent wires by interposing a thin plate between adjacent wires of the coil. . 2. The thin plate according to claim 1, wherein a thin plate protruding portion is formed radially from an annular plate having a smaller diameter than the coil, and the thin plate protruding portion is interposed between adjacent wires of the coil. Filter element used for precoat filtration.