JP2010207790A - Filtration assistant line for spring type filter and filter element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filtration assistant line for spring type filters and a filter element, enabling permanent microfiltration without needing any consumable supplies. <P>SOLUTION: The filtration assistant line for spring type filters is a wire having a cross sectional area of more than 0.03 mm<SP>2</SP>and less than 2.0 mm<SP>2</SP>, comprising a 5-200 μm concave portion and a 5-200 μm projection, and having toughness. A filter element is also provided, so that it completely covers the filtration assistant line for spring type filters along the periphery of a cylindrical housing comprising a spiral spring around which an elastic wire with protrusions formed at irregular pitches is wound spirally and so that concave portions and projections of each wire are located at random. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a filter element that filters fine substances present in liquids and gases, and particularly stable for a long time without clogging filtration of fine suspensions in liquids and fine dust in gases. It relates to filter elements that can be used for

  Conventionally, filter cloths and filter papers are used as filter elements for filtering liquids and gases, but filter cloths and filter papers are clogged by the material to be filtered, so they need to be replaced periodically, and running costs are incurred. . There is a need for a filter element that does not clog and does not require replacement.

  As filter elements that do not cause clogging and need not be replaced, there are the following Patent Documents 1 and 2, and a coil spring type is disclosed.

Japanese Patent No. 1822317 Japanese Patent No. 3124901

  Patent Document 1 discloses a filter element in which elastic wire rods having protrusions formed at substantially equal pitches in advance are spirally wound, and can be filtered at minute intervals by the protrusions, and the minute intervals are expanded. By doing so, clogging is eliminated, but precise filtration cannot be performed only with a minute interval due to protrusions. In Patent Document 2, fine filtration is possible by attaching a filter aid such as diatomaceous earth or activated carbon powder to the gap between coiled filter elements. Therefore, it is very difficult to separate them, so that the filter aid must be discarded together with the material to be filtered, and the filter aid becomes a consumable item.

  SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a spring filter filter auxiliary wire and a filter element that are free from consumables and enable permanent microfiltration permanently.

  As a result of extensive research on the above problems, the present inventors have devised a filter auxiliary line that can be permanently microfiltered and can be easily separated from an object to be filtered, thereby completing the present invention. It came.

That is, the cross-sectional area 0.03 mm ² beyond the present invention, less than 2.0 mm ^2, a spring-type filter for filtration aid, which is a wire having a toughness having recesses and protrusions of 5~200μm A line is provided.

  In this wire, it is preferable that the concave portion and the convex portion are present at the same position on the wire and shifted by a normal position or a phase of 90 degrees.

  In addition, a filter element according to another aspect of the present invention is a cylindrical housing comprising a spring-type filter auxiliary wire, and a spiral spring in which an elastic wire having a protrusion formed at an equal pitch is spirally wound. It is characterized in that it is installed so as to completely cover the outer periphery of the body and the uneven portions of each wire are randomly located.

  As described above, according to the present invention, it is possible to provide a filter element that can be permanently filtered and a spring-type filter element that can perform fine filtration without any consumables.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. However, the present invention can be implemented in many different forms, and is not limited to the description of the following embodiments and examples. .

  The present embodiment relates to a filter aid for a spring type filter and a filter element.

(Filtration auxiliary wire for spring type filter)
Spring-type filter for filtration aid line according to the present embodiment is greater than the cross-sectional area 0.03 mm ^2, less than 2.0 mm ^2, and characterized in that the wire having a toughness having an uneven portion of 5~200μm To do.

When the cross-sectional area of the wire is 0.03 mm ² or less, the number of auxiliary wires used for the filter element increases and the cost becomes high, and separation from an object to be filtered at the time of backwashing described later becomes difficult. If the cross-sectional area is 2.0 mm ² or more, the wire becomes heavier, and if the weight of the filter element becomes excessive, it is necessary to increase the washing pressure at the time of back washing. Become high.

Sectional area of the more preferred wire is 0.1 mm ² greater than, less than 1.0 mm ^2.

  The uneven | corrugated | grooved part in this invention points out the dent and swell from the wire-material reference | standard surface shown in FIG. 1, and makes the height (low) 5-200 micrometers. If the uneven portion is 5 μm or less, microfiltration can be performed, but the amount of filtration becomes small, which is not preferable. If the uneven portion is 200 μm or more, sufficient filtration cannot be performed, which is not preferable.

  A more preferable uneven | corrugated | grooved part is 10-100 micrometers.

  The wire is preferably a material that shrinks during filtration (adheres to the spring type filter), stretches (swells) during backwashing, and has a toughness that does not break under some impact. Metals such as stainless steel and titanium, polyethylene, polypropylene, polyethylene terephthalate Organic polymers such as tempered glass and ceramics can be used, but the material is not particularly limited.

  In the auxiliary wire of the present invention, as shown in FIG. 1, it is preferable that the concave portion and the convex portion are present at the same position on the wire and shifted by a normal position or a phase of 90 degrees. This shape is a state in which when the concave portion is formed by a processing method such as rolling or pressing the wire, the surface shifted by 90 degrees from the concave surface due to the law of conservation of mass becomes a convex portion. This is particularly preferable because it is formed with convex portions. In particular, a method in which a roller having a plurality of grooves parallel to the axial direction is used and the wire is sandwiched and rolled is preferable.

  The formation of the concavo-convex portion on the wire is not limited to rolling or pressing, and may be performed by any method. The concave portion can be formed by cutting, etching, or the like, and the convex portion can be formed by overlay welding, joining, bonding, or the like. These methods have a problem in that the processing steps are complicated and the cost is high.

(Filter element)
The filter element according to the present embodiment covers each wire rod so as to completely cover the outer periphery of a cylindrical casing made of a spiral spring in which a resilient wire rod having protrusions formed at equal pitches is spirally wound. It is characterized in that it is installed so that the uneven portions are randomly located. In order to completely cover the cylindrical casing made of the winding spring, it is preferable to install 100 or more, preferably 200 or more filter element filtration aid wires, but the number is not particularly limited.

  In the conventional spring-type filter, the surface on which the material having protrusions on the arcuate outer surface is wound in a coil shape becomes the filtration area, and the size of the gap formed by the protrusions is accurately determined. By pre-coating a filter aid on the outer peripheral surface of the spring type filter, the filtration gap can be made fine and fine filtration becomes possible. Clogging may occur when the amount of the material to be filtered increases, but when clogged, the filter element may be backflowed from the inner hollow part of the filter element toward the outside of the coil, or by flowing compressed air or the like, that is, backwashing. The agent is removed from the gap together with the material to be filtered, and the clogging is eliminated, and the mixture of the filter aid and the material to be filtered is discarded. (Figure 2)

  The filter element using the filtration auxiliary wire of the present invention is installed along the outer periphery of a cylindrical casing made of a winding spring, and the ends of the wire are fixed on the top and bottom of the casing. Since the uneven portion of the wire exhibits the same action as the filter aid, the filtration gap can be made fine and precision filtration becomes possible. When the amount of objects to be filtered increases and becomes clogged, the objects to be filtered are removed from the gaps by back washing, and the clogging is easily eliminated. At this time, the auxiliary line is extended (backed up) by backwashing pressure to open the line interval and facilitate the removal of the object to be filtered. However, the auxiliary line itself is not detached from the housing, and the filtration can be continuously repeated repeatedly. I can do it. (Figure 3)

  Hereinafter, the filter auxiliary wire for a spring type filter and the filter element described in the above embodiment were actually created to confirm the effect of the present invention. Examples of the present invention will be described in detail below, but the present invention is not limited to these ranges.

Example 1
An auxiliary wire was formed by continuously forming 20 μm irregularities with a spacing of 3 mm from a wire rod (cross-sectional area 0.79 mm2) of stainless steel (SUS304) having a diameter of 1 mm. A filter element in which 200 auxiliary wires were installed along the outer periphery of a cylindrical casing made of a winding spring was created, and sewage suspended in a solid of 0.5 to 30 μm was filtered.

(Comparative Example 1)
The same sewage as in the example was filtered using a cylindrical casing made of the same spring as in the example and using diatomaceous earth as a filter aid.

Table 1 shows the filtration results of Example 1 and Comparative Example 1.

  As can be seen from Table 1 showing the filtration results of Example 1 and Comparative Example 1, the filtration aid for spring type filter and the filter element of the present invention have the same filtration capacity and backwash time, and supply aid (consumables) ) Is unnecessary and it can be seen that continuous filtration is possible.

  The present invention can be widely used in public uses such as sewage treatment and purification treatment, and industrial uses such as dust removal, and in particular, it can be used for various uses as it can be permanently filtered without replacements or consumables. Is possible.

It is a figure which shows the structure of an auxiliary line. It is explanatory drawing of the spring type filter using a filter aid. It is explanatory drawing of the spring type filter using an auxiliary line.

DESCRIPTION OF SYMBOLS 1 ... Spring filter element 2 ... Core metal 3 ... Top metal fitting 4 ... Bottom metal fitting 5 ... Filter aid 6 ... Filtered object 7 ... Auxiliary wire

Claims (3)

Sectional area 0.03 mm ² exceeds, less than 2.0 mm ^2, a spring-type filter for filtration aid lines, characterized in that the wire having a toughness having recesses and protrusions of 5 to 200 [mu] m.   The filter aid wire for a spring-type filter according to claim 1, wherein the concave portion and the convex portion are present at the same position on the wire and shifted from each other at a normal position or a phase of 90 degrees.   The filtration auxiliary wire for a spring-type filter according to claim 1 or 2 is arranged along the outer periphery of a cylindrical casing made of a wound spring in which a resilient wire having protrusions formed at equal pitches is spirally wound. A filter element characterized in that the filter element is installed so as to completely cover and the uneven portions of each wire are randomly positioned.