KR20200099454A - Method of manufacturing casing for filtering module, and casing for filtering module - Google Patents

Abstract

Provided is a method of manufacturing a casing for a filtering module to have excellent non-abrasion and corrosion resistance without expensive molds for manufacturing. The present invention relates to a method of manufacturing a casing (100) for a filtering module having a helical fin (12) on a circumferential wall of a filter accommodation chamber (16) that accommodates a cylindrical filter (20) using a side wall as a filter material, the method including: a fin formation process of forming a metal spiral fin (12); and a fin insertion step of inserting the helical fin (12) into the filter accommodation chamber (16) including an inner space of a casing body formed of a metal circular tube. In the fin formation process, it is preferable to form a spiral fin by winding a strip-shaped metal plate around a circumferential member.

Description

A method for manufacturing a casing for a filtration module, and a casing for a filtration module TECHNICAL FIELD [Method OF MANUFACTURING CASING FOR FILTERING MODULE, AND CASING FOR FILTERING MODULE]

The present invention relates to a method of manufacturing a casing containing a cylindrical filtration filter, and more particularly, to a method of manufacturing a casing for a filtration module having a helical passage in a peripheral wall of a cylindrical filtration chamber containing a filtration filter. .

BACKGROUND ART Conventionally, a filtration module is widely used in which a cylindrical filter having a side wall as a filtration material is disposed in a columnar filtration chamber extending in the vertical direction, and a liquid to be filtered is passed through the filter from outside to inside.

In such a filtration module, it has been proposed to provide a spiral passage in the space between the inner wall of the filtration chamber and the side wall of the filter in order to suppress the adhesion of filtration solids to the outer circumference of the filter medium. Proposed such a module in the manufacturing method of the casing, a method of cutting it off by mechanical processing from a mass of resin, or by attaching two or three resin members formed by injection molding. Proposing a method of forming a casing.

[Patent Document 1] Japanese Unexamined Patent Application Publication No. 2018-001 5 6 9 3

However, in the method of manufacturing a filtration module of Patent Document 1, there is a problem in that the yield is poor, such as the thin and long fins are damaged during processing in the method of cutting away from the resin mass by machining.

In addition, in the method of bonding the injection-molded two-part members or third-part members together, there are the following problems. That is, (1) it has been confirmed that a fine pulsating flow occurs due to the step difference between the members attached to the inner wall of the filtration chamber, and this pulsating flow may cut the resin and cause a hole in the casing, or the shape of a spiral groove. Due to this change, there is a concern that the flow rate or flow rate of the circulating water may change. (2) The production cost of a mold for forming a second or third member by injection molding is high. (3) Raw water subject to filtration is not only fresh water, but also drainage, wastewater, sewage, high temperature water, etc., so when the casing is made of resin, the temperature of the raw water or the particles mixed with it B. There is a risk of abrasion and corrosion due to chemicals.

The present invention has been made in order to solve such a problem, and an object of the present invention is to provide a method of manufacturing a casing for a filtration filter capable of providing a casing having low manufacturing cost and excellent abrasion resistance and corrosion resistance.

The invention made in order to solve the above problem is a method of manufacturing a casing for a filtration module having a helical pin on the circumferential wall of a filter accommodation chamber accommodating a cylindrical filter for filtering at the side wall, and forming a metal helical pin It is characterized by including a pin forming step and a pin insertion step of inserting the helical pin into a filter accommodation chamber composed of an inner space of a casing body made of a metal circular tube.

As described above, in the manufacturing method of the casing for a filtration module of the present invention, after forming a spiral pin separately from the casing body, it is accommodated in the filter accommodation chamber of the casing body, and a lump material such as a bar is pierced. Compared to the case of cutting out the spiral pins, the filter accommodation chamber with the spiral pins can be formed more easily, and at the same time, material cost can be saved. In addition, by doing in this way, since the step difference caused by the bonding of the two- and third-part members can be eliminated, the generation of pulsating flow can be prevented and a spiral flow can be effectively formed on the filter surface.

In the pin formation step, it is preferable to form a helical pin by winding a strip-shaped metal plate around a cylindrical body. By doing so, it is possible to easily form a helical pin.

In the manufacturing method of the casing for a filtration filter of the present invention, a helical groove forming step of forming a helical groove in the inner wall of the filter accommodation chamber is provided, and in the pin insertion step, the helical pin is inserted into the helical groove, and the It is preferable to insert a helical pin into the filter receiving chamber. By doing so, the spiral pin can be easily inserted into the filter accommodation chamber.

In the pin insertion process, it is preferable to insert the spiral pin into the spiral groove while rotating the spiral pin. By doing so, it is possible to easily insert the spiral filter into the spiral groove.

The manufacturing method of the casing for a filtration module of the present invention comprises a pin welding step of welding the helical pin to the casing body, and in the pin welding step, communicating with the helical groove from the outer wall side of the casing body It is preferable that a welding concave portion is provided, and the helical pin is welded to the casing body from the welding concave portion. By doing so, the spiral pin can be easily fixed to the casing body.

In the pin insertion step, it is preferable that at least a portion of the lower side of the spiral flow path formed by the spiral pin is gradually narrowed while facing downward. The raw liquid to be filtered gradually passes through the filter while flowing through the spiral flow path while contacting the filter surface, so the flow rate decreases and the speed decreases. By making the spiral flow path narrow while facing downward, the cross-sectional area of the flow path can be matched with the quantity of raw water flowing through the spiral flow path, and the flow velocity of the raw water flowing through the spiral flow path can be increased.

The present invention is a casing for a filtration module having a helical pin on the circumferential wall of a filter accommodation chamber accommodating a cylindrical filter for filtering from the side wall, and a casing made of a metal circular tube with the inner space as the filter accommodation chamber And a casing for a filtration module, comprising a main body, and a metal helical pin provided on an inner wall of the filter accommodation chamber, and configured as a separate body from the casing main body.

The helical pin is preferably inserted into a helical groove provided in the circumferential wall of the filter accommodation chamber, and the helical flow path formed by the helical pin gradually increases with at least a portion of the lower side facing downward. It is better to install it so that it is narrow.

As described above, according to the manufacturing method of the present invention, it is possible to provide a casing for a filtration module excellent in durability and economy.

1 is a longitudinal sectional view of a filtration module according to an embodiment of the present invention.
2 is a partial front view showing an upper appearance of the filtration module shown in FIG. 1.
3 is a cross-sectional view taken along line XX in FIG. 1.
4 is an explanatory diagram showing an example of a method of forming a spiral pin, (a) shows a plate material used for forming a spiral pin, and (b) shows a shape in which the plate material is spirally wound to form a spiral pin. Is shown.
5 is a longitudinal sectional view of the casing body shown in FIG. 1.
6 is a longitudinal sectional view of the casing shown in FIG. 1.
Fig. 7 is a diagram showing a state in which a helical pin is welded to the casing body, (a) is an explanatory view showing a state viewed from the outside of the casing body, and (b) is an explanatory view showing a main part in a longitudinal section.
FIG. 8 is a front view illustrating a part of the filter made by winding the thread shown in FIG. 1 without breaking.

Hereinafter, embodiments of the present invention will be described in detail with reference to appropriate drawings. However, the present invention is not limited to the following embodiments.

1 shows a filtration module 100 according to an embodiment of the present invention. The filtration module 100 mainly includes a casing 10 and a filter 20, and a filter cap 3, a filter hold 4, a casing cap 5, and a safety bar 6 It is equipped with.

As shown in FIG. 6, the casing 10 removes a bottomed tubular shape with an open top, and a cylindrical casing main body 11 and an inner peripheral surface of the casing main body 11 The bottom member 13 made of a helical pin 12 installed in the bottom member and a disk blocking the bottom of the casing body 11, and a through hole provided in the center of the bottom member 13 to the bottom. A filter support pipe 14 extending elongate and a raw water discharge port 19 extending downward from a through hole near the periphery of the bottom member 13 are provided. The casing 10 is preferably formed by processing stainless steel throughout, but metals other than iron or aluminum may be used. By using stainless steel having excellent heat resistance, corrosion resistance, and abrasion resistance, it is possible to treat a wide range of water quality such as fresh water such as groundwater, factory drainage, and industrial wastewater.

The casing body 11 is made of a metal circular tube such as stainless steel, and as shown in Fig. 5, a spiral groove 15 is provided on the inner circumferential surface by machining (helical Groove forming process), a pair of bar holes 11c and 11c facing each other in the radial direction are provided near the upper end. In the spiral groove 15, the interval W between the adjacent grooves is constant in the upper half, while the interval W is gradually narrowed while the lower half faces downward. In addition, on the upper end side of the casing body, there are two slit-shaped viewing windows 11d (see Fig. 2) used when pulling out the filter 20 from the casing 10, as described later, in two places in the circumferential direction (in Fig. 2, one place). Only shown) is installed, and a pair of stopper pieces (11e, 11e) are installed as a stopper connecting the lower end of the casing cap 5.

As shown in Fig. 6, the helical pin 12 is made of a single strip material formed of a long plate-like metal plate such as stainless steel and connected in a spiral shape. The helical pin 12 is a round bar that rotates by a shelf or the like as shown in Fig. 2(b) by rotating the long plate 12A, for example, as shown in Fig. 4(a) in the fin formation step. It is formed by winding it around the shaft (column-shaped body) (A) of a 棒) shape. The helical pin 12 is inserted, for example, into the helical groove 15 by inserting its lower end into the upper end of the helical groove 15 and then rotating it (pin insertion step). The spiral groove 15 is provided with a stopper (not shown in the figure) for stopping the spiral pin 12 at a predetermined position.

As shown in FIG. 7, the plate-shaped spiral pin 12 is a spiral groove (external circumferential surface) of the casing main body 11 in a state where the outer edge connection in the width direction is inserted into the spiral groove 15. 15) and is welded to the casing body 11 from the outside through a cutout groove 11a installed so as to intersect with the spiral groove 15 at the same time (pin welding process, reference numeral in FIG. 7 The ellipse of the two-dot chain line shown in 12b shows the welded portion in a modeling format). In this way, by fixing the helical pins 12 to the casing main body 11, a helical flow path 17 is formed in the circumferential wall of the filter accommodation chamber 16.

The helical pin 12 is formed to have a thickness of 1 mm or more and 5 mm or less, and a protruding height from the inner circumferential surface of the casing body 11 to be 3 mm or more and 10 mm or less, according to the outer diameter of the filter, etc., and the outer diameter of the filter 20 If this φ 62 mm, for example, a thickness of 2 mm and a protruding height of 7.5 mm are formed.

As shown in FIG. 6, the spiral fin 12 is provided with a raw water introduction part 121 formed so as to gradually widen the width of the fin while facing downward on the upper end side. By doing so, it becomes easy to introduce raw water into the filter accommodation chamber 16 and the spiral flow path 17. In addition, the lower half of the helical pin 12 gradually decreases as the width W of the adjacent pin faces downward along the helical groove 15, so that the helical flow path 17 is gradually narrowed. It is installed so that it can be installed. The raw water flowing through the helical flow path 17 gradually passes through the filter 20 and decreases as the flow rate decreases, so that the flow rate decreases so that the cross flow effect cannot be sufficiently obtained. Therefore, by narrowing the spiral flow path 17 only below it, the flow velocity of the raw water can be maintained and a decrease in the cross flow effect can be suppressed.

The filter 20 is equipped with an inner core 21, a seal layer 22, and a pair of upper and lower end members 23 and 23, as shown in FIG. 8.

As shown in Fig. 1, the inner core 21 is formed in a cylindrical shape with open upper and lower ends of resin or metal, and is formed of a plurality of through holes penetrating in the thickness direction of the side wall. The window-shaped water passing holes 21a are formed in a lattice shape in parallel in the circumferential direction and in the axial direction. On the outer circumferential surface of the inner core 21, as shown in Fig. 8, a plurality of axially connected (in the example of the drawing display, a total of 8 pieces of 2 pieces at 4 points in the circumferential direction) ) A convex tank (21b) is installed. When cutting the thread layer (22) with a knife in order to reuse the inner core (21), the convex tank (21c) consisting of a bone (谷間) between two cushioning tanks (21b, 21b) arranged adjacently It is used as a guide.

The thread layer 22 is formed by winding a braided thread, such as cotton or polypropylene, around the inner core 21 by winding several times. The yarn used for the yarn layer 22 may be appropriately selected and used according to a target filtration amount or degree of filtration, a widely known yarn generally used for a filter made by winding yarn.

The seal layer 22 is adhered to the convex tank 21b for buffering while adjoining the adjacent yarns at a plurality of locations (for example, two locations) in the circumferential direction by means of an adhesive. (懸架用) In the vicinity of the convex tank 21b, it is wound around the inner core 21 in a state that is somewhat spaced from the outer peripheral surface of the inner core 21 and is turned.

As shown in FIG. 1, the end member 23 is provided with a flat tubular inner core fitting portion 231 and a filtered water outlet 233 with a flange portion 232 therebetween. Then, the inner core 21 is inserted into the inner core 21 to close the openings at both ends of the inner core 21. The inner core fitting portion 231 is provided with a user hole 23a for inserting the safety bar 6 when the filter 20 is pulled out from the casing 10 on the outer circumferential surface. have.

The user hole 23a is provided slightly below the viewing window 11d when the filter 20 is set in the casing 10, and when the filter 20 is pulled out from the casing 10, By inserting the front end of the safety bar 6 into the user hole 23a of the upper end member 23 through the viewing window 11d, and pressing down the rear end thereof, the safety bar 6 As a lever having the edge of the viewing window 11d as a support point, the filter 20 is lifted.

On the outer circumferential surface of the filtered water outlet 233, two O-ring grooves 233a and 233a are provided for inserting the O-ring 7 sealing a gap with the inner circumferential surface of the filter support pipe 14. .

The filter cap 3 is formed in a cylindrical shape with a lid from a soft resin having elasticity such as polypropylene, and is configured to close the filtered water outlet 233 of the upper end member 23. The filter hold (4) is in the vicinity of the lower end of the cover-shaped tubular hand held portion (holding portion) 41, the convex portion 42 protruding upward from the holding portion 41, and the gripping portion 41. It has a grate portion 43 extending radially from a plan view, and an outer peripheral portion 44 that is supported at the outer end of the grate portion 43 and abuts against the inner peripheral surface of the casing body 11 . The casing cap (5) eliminates the cylinder with a flat cover, and the bar holes (5c, 5c) to fit the safety bar (6) into the side wall formed by a punching board with a large number of through holes (5a) Is formed. By putting the casing cap (5) on the casing (10) and inserting the safety bar (6) into the bar holes (5c, 11c), the filter hold (4) presses the convex portion (42) to fix the casing. Desorption of the cap 5 is prevented.

Further, reference numerals 61 and 62 denote a stopper and a latch for preventing the safety bar 6 from falling off, and reference numerals 61a and 61b denote a chain for preventing loss of the safety bar 6 and the latch 62, respectively.

The filter 20 accommodates the filter in the casing 10 by inserting the filtered water outlet 233 of the lower end member 23 into the filter support pipe 14 as shown in FIG. 1. It is accommodated in the thread 16. At this time, the positions of the viewing window 11d and the user hole 23a are matched. The seal layer 22 is surrounded by a helical pin 12 with a slight gap 18 therebetween, and the upper end member 23 is the raw water introduction part 121 of the helical pin 12 It is surrounded by.

When filtering using the filtration module 100, for example, the filtration module 100 is installed on the bottom of a raw water storage tank (not shown in the drawing) that stores raw water to be filtered, and the corresponding raw water Raw water is stored in the storage tank until the upper end of the filtration module 100 is submerged, and raw water is injected into the filter accommodation chamber 16 through the through hole of the casing cap 5. A large mixture of raw water is prevented from entering the filtration module 100 by punching metal.

The raw water flowing into the filter accommodation chamber 16 flows into the spiral flow path 17 and the gap 18 between the spiral fins 12 and the seal layer 22. Since the spiral fin 12 is provided with a raw water introduction portion 121 in which the width of the fin is gradually widened while facing downward on the upper end, the raw water flowing into the filter accommodation chamber 16 is shortened along the gap 18. -cut) can be suppressed and smoothly absorbed into the spiral flow path 17.

The raw water flowing through the spiral passage 17 and the gap 18 passes through the seal layer 22 and the inner core 21 of the filter 20 to become filtered water and flows into the inner space 8 of the inner core 21 Then, it is discharged from the filtered water outlet 233 at the lower end of the inner core 21, and flowed to a suitable next process device such as a tank for storing the filtered water.

Further, the raw water flowing into the filter receiving chamber 16 flows down while turning the spiral flow path 17, so that impurities such as solids in the raw water are separated from the filter surface by centrifugal force. In addition, a spirally orbiting water flow, a Taylor vortex or Dean vortex in which it occurs, and a flow of water flowing down the gap 18 vertically along the seal layer 22 occur on the surface of the seal layer 22 together. Since the cross-flow effect can be enhanced by various water flows, the solid matter adhering to the seal layer 22 can be efficiently removed.

In the present embodiment, since the helical fin 12 is made of stainless steel, the edge can be sharply formed, so that Dean vortex and Taylor vortex can be effectively generated, and the activity is improved compared to the resin, The effect of centrifugal force or cross flow that softens the flow of raw water increases.

The raw water flowing through the spiral flow path 17 gradually passes through the seal layer 22 of the filter 20 and flows into the inner space 8, so that the amount of water decreases and the flow velocity decreases as it goes downward. In the present embodiment, since the spiral flow passage 17 gradually narrows downwards, it is possible to suppress a decrease in the applied flow velocity gradually, and further decrease in the crossflow effect.

Since the casing main body 11 is formed of a pipe material, there is no step in the circumferential direction on the inner circumferential surface, and generation of a pulsating flow due to the step difference can be suppressed. Further, since the casing body 11 is entirely made of stainless steel, it is excellent in chemical resistance and abrasion resistance, and various liquids can be filtered.

The raw water flowing down the spiral flow path 17 without passing through the filter 20 is discharged from the raw water discharge port 19 opening at the lower end of the spiral flow path 17, and returns to the raw water storage tank, for example. , Again processed by the filtration module 100.

When performing backwashing of the filter 20, the washing water is pressurized by a backwashing pump (not shown in the drawing), and the inner core 21 and the seal layer (in the inner space 8 of the filter 20) are pressurized. 22) to the outside, and pass the washing water. Due to this as well, the solid matter accumulated in the seal layer 22 can be removed. In this embodiment, at least the filter chamber of the seal layer 22 is formed by the buffer tank 21b on the outer circumferential surface of the inner core 21 by the buffer tank 21b. Since the distance is somewhat separated from the outer circumferential surface, the filter chamber is liable to vibrate during backwashing, and solids can be efficiently removed.

The raw water becomes more contaminated as it descends the spiral flow path 17, so that the amount of solid matter increases as the bottom of the seal layer 22 goes down. In this embodiment, since the end material having the filtered water outlet 233 is provided above and below the filter 20, the filter 20 is used until the entire seal layer becomes dirty by appropriately replacing the top and bottom. ) Can greatly increase the life span.

This invention is not limited to the above-described embodiment, and a spiral pin may be provided in the casing body without making a spiral groove in the inner surface of the casing body. For example, a spiral pin may be inserted into a casing body without a spiral groove and fixed by welding only at both ends thereof. The spiral pin may be fixed to the casing body by a method other than welding. The helical pin may cut a metal circular tube into a helical shape by machining. The helical pin may not have a raw water introduction portion, and the pin width W may be constant over the entire length.

The filter is not limited to a filter made by winding a thread, and a widely known cylindrical filter having a side wall as a filter material, such as a ceramic filter, can be suitably used. The inner core does not need to be provided with a convex tank for a shock absorber, and may be divided into several pieces in the lengthwise direction.

The filtration module may not be an immersion type filtration module, but may be a pressure type, a casing storage type, or other non-immersion type filtration module. The inner-core water passing hole is not limited to a rectangle, but may be a square, circular, or other suitable shape.

100: filtration module
20: filter
16: filter receiving room
10: casing
12: spiral pin
11: casing body
A: columnar body
15: spiral groove
11a: welding concave
17: spiral flow path
W: spacing

Claims (9)

A method of manufacturing a casing for a filtration module having a helical pin on a circumferential wall of a filter accommodation chamber accommodating a cylindrical filter for filtering at a side wall,
A fin formation step of forming a metal spiral fin,
A method of manufacturing a casing for a filtration module, comprising: a pin insertion step of inserting the helical pin into a filter accommodation chamber made of a space inside the casing body made of a metal circular tube. The method of claim 1,
In the fin formation step, a method of manufacturing a casing for a filtration module, wherein a helical fin is formed by winding a strip-shaped metal plate around a cylindrical body. The method of claim 1,
A helical groove forming step of forming a helical groove in the inner wall of the filter accommodation chamber,
In the pin insertion step, the spiral pin is inserted into the spiral groove to insert the spiral pin into the filter accommodation chamber. The method of claim 3,
In the pin insertion process, the method of manufacturing a casing for a filtration module, in which the spiral pin is inserted into the spiral groove while rotating. The method of claim 3,
A pin welding process of welding the spiral pin to the casing body is provided,
In the pin welding process, a welding convex part communicating with the spiral groove from the outer wall side of the casing body is provided, and the helical pin is welded to the casing body from the welding convex part. Manufacturing method. The method according to any one of claims 1 to 5,
In the pin insertion step, a method for manufacturing a casing for a filtration module, in which at least a portion of a lower side of a spiral flow path formed by the spiral pin is provided downward and gradually narrower. A casing for a filtration module having a helical pin on a circumferential wall of a filter accommodation chamber in which a cylindrical filter for filtration from the side wall is accommodated,
A casing body made of a metal circular tube with an inner space as a filter accommodation chamber,
A casing for a filtration module, characterized in that it is configured as a separate body from the casing main body, and has a metal spiral pin installed on an inner wall of the filter accommodation chamber. The method of claim 7,
The helical pin is inserted into a helical groove provided in a peripheral wall of the filter housing chamber. The method according to claim 7 or 8,
The helical fin is provided so that the gap gradually narrows while at least a portion of the lower side faces downward.

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