JP2000176214A - Filter device and filtering method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the release property of solid mater stuck to a filter element at the time of back washing and to shorten the back washing time. SOLUTION: The inlet 12 and the outlet 13 divided with a tube plate 14 are provided at a cylindrical main body 11, and one end part of the plural long and thin coil type filter elements 15 having a spring property are mounted onto the tube plate 14. The piston 16 whose outer periphery is brought into sliding contact with the inner surface of the main body is arranged in the main body 11, and the other end parts of the filter elements 15 are mounted to the piston 16. The piston 16 is driven by the driving means 29 by the fluid pressure in the main body 11 so that each filter element 15 is compressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtration device for filtering fine solids in a liquid or a gas and a filtration method using the filtration device.

[0002]

2. Description of the Related Art As a device for filtering minute solids in a fluid such as a liquid or a gas, for example, JP-A-8-196821 discloses a device for passing a fluid between adjacent wheels of a spirally wound wire. The use of a filter element having a gap is proposed. As shown in FIG. 3, the filtration element 1 is formed by spirally winding a wire having a circular cross section provided with a plurality of protrusions A along the outer peripheral portion, and providing a gap B for fluid passage between adjacent rings of the wire. The entire element is formed in a coil shape.

FIG. 4 shows a filtering device using the coil type filtering element 1. The top fitting 3 is attached to the mounting hole of the tube sheet 7 provided in the apparatus main body, the filtering element 1 is attached to the top fitting 3, and the upper end of the core 2 with the bottom fitting 4 attached to the lower end with a nut 5 is attached to the top fitting. 3 and fastened with a nut 6 from above. Then, around the filter element 1, a filter aid 8 in which diatomaceous earth or diatomaceous earth is used as a main component and powder such as pulp powder or activated carbon is mixed thereto is adhered. At the time of filtration, the fluid flows into the inside from the outer peripheral portion of the filtration element 1 as shown by the arrow and is discharged from above. At this time, a minute solid to be filtered is captured by the filter aid 8 and removed. When the solid content accumulates in the filtration element 1 and the fluid resistance (differential pressure) increases by performing the filtration operation for a predetermined period, back washing is performed to restore the filtration element 1 to the initial state. At this time, various proposals have been made to extend the filter element 1 composed of a coil spring and increase the gap therebetween.

[0004]

However, such back washing of the conventional filter element 1 has a drawback that a special cylinder is required to extend the filter element, and the structure is complicated. Therefore, an object of the present invention is to provide a filtering device which solves such a problem and a filtering method using the same.

[0005]

According to a first aspect of the present invention, there is provided a filter device comprising: a cylindrical main body;
1, a fluid inflow portion 12 and a fluid outflow portion 13 provided in
A tube sheet 14 for partitioning the inflow portion 12 and the outflow portion 13, a coil-type filter element 15 having one end attached to the tube sheet 14 and having a spring property, and an outer periphery sliding on the inner surface of the main body 11. A moving disk-shaped piston 16; and a driving means 29 that changes the fluid pressure applied to the piston 16 and drives the same. The other end of the filter element 15 is connected to the piston 16 It is characterized by having. According to the present invention, the main body 1 can be used during backwashing.
The filter element can be extended by a simple structure of applying a fluid pressure to a piston that slides on the inner surface of the filter element by itself, also serving as a cylinder, so that the gap can be opened and backwashing can be performed easily and quickly.

[0006] The invention according to claim 2 is based on claim 1.
A filtration method comprising filtering the fluid while compressing the filtration element with a piston by using the filtration device described in 1 above, and washing the filtration element with the compression released. According to this method, quickly and reliably,
Switching between filtration and backwashing.

[0007]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a part of the filtration device of the present invention, which is cut away, and FIG. 2 is an enlarged view of a part II in FIG. The filtering device 10 includes a cylindrical main body 11, an inflow portion 12 and an outflow portion 13 of a fluid provided in the main body 11, and a tube sheet 14 that partitions the inflow portion 12 and the outflow portion 13. In the main body 11, there are provided a plurality of elongate coil-shaped filtration elements 15 having a spring property and one piston 16 whose outer periphery comes into contact with the inner surface and slides. One end of each filtration element 15 is attached to a tubesheet 14 and the other end is connected to a piston 16.

The main body 11 is constituted by sequentially connecting a lower body portion 17, an upper body portion 18, and a lid portion 19 having a circular cross section. Lower torso 1
7, an inflow portion 12 is provided, and a piston 16 is slidably disposed therein via a sealing O-ring 33 and a sliding ring 32 as shown in FIG. A tube sheet 14 is attached to the part. The tube sheet 14 and the upper edge of the lower body 17 are flanged. Similarly, the upper body 18 and the lid 19 are flange-connected, and the outlet 13 is provided at the top of the lid 19. A pipe 20 communicating with a tank (not shown) for storing a fluid to be filtered is connected to the inflow section 12, and the pipe 20 is provided with an on-off valve 21. Further, a pipe 22 communicating with a tank (not shown) for storing the filtered fluid is connected to the outflow portion 13, and the pipe 22 is provided with an on-off valve 23.

A plurality of mounting holes 24 are two-dimensionally provided on the entire surface of the tube sheet 14 at equal intervals. Further, the piston 16 is formed of a metal disk having corrosion resistance and durability, such as stainless steel, having a strong pressure, and a plurality of mounting holes 25 are two-dimensionally provided on the entire surface thereof at equal intervals. The filtration element 15 is formed by spirally winding a corrosion-resistant metal wire such as stainless steel, and a mounting bracket 27 connected to both ends thereof.
And is detachably attached to the attachment hole 24 of the tube sheet 14 and the attachment hole 25 of the piston 16 by a connecting member 28 such as a bolt. The wire loop 26 has a spring property, and can be expanded and contracted by sliding the piston 16. A metal wire having a plurality of protrusions A along the outer peripheral portion as shown in FIG. 3 is used, so that a gap B for fluid passage is formed between adjacent rings of the wire ring 26. ing. Then, at the time of filtration, the fluid passes through the gap B. In this case, without providing the protrusion A, the filtering element 15 may be set to a slightly extended state by the piston 16 at the time of filtration, and the fluid may be passed through the gap formed thereby.

The piston 16 is slid by driving means 29. In this example, a pressurized fluid is used as a drive source of the drive means 29, and the lower body part 17 constituting the main body 11 acts as a cylinder, and is guided on the inner wall surface through a sliding contact ring 32 so that the piston 16 The periphery slides. An annular groove is formed in the peripheral portion of the piston 16, and an O-ring 33 for sealing is fitted therein. The pressurized fluid is supplied by a pipe 30 that communicates with a pressurized fluid source (not shown) such as a pump that pressurizes water or the like or a compressor that pressurizes air and the like. 31 are provided. The driving means 29 is constituted by the pressurized fluid supply means and the lower body 17.

Next, the operation of the filter device 10 will be described. First, a diatomaceous earth or diatomaceous earth as a main component is mixed with a filter aid made by mixing powder such as pulp powder or activated carbon around each filter element 15. That is, pipe 2
0 and the line of the pipe 22 are switched to a filter aid supply line, and the filter aid is attached to the periphery of each filter element 15 by circulating a liquid containing the filter aid from a filter aid tank (not shown) in the main body 11. After growing and attaching a predetermined amount, the line is switched to the fluid side (filtration side).

(1) Filtration Step In order to filter the fluid, the fluid is compressed so that a predetermined fluid passage is formed between the wire rings 26 of each of the filtration elements 15. This compression is performed by opening the on-off valve 31 and sliding the piston 16 upward. In the case where a plurality of protrusions A are provided on the metal wire along the outer peripheral portion as shown in FIG. Is completely compressed. If the protrusion A is not provided, the wire is compressed to a position where a similar gap B is formed between the adjacent wheels of the wire loop 26. Next, the on-off valves 21 and 23 are opened, and the fluid to be filtered is circulated in the main body 11 to start filtration. If the filtration is continued, the solid content gradually accumulates between the wire loops 26 of the respective filtration elements 15 and the differential pressure increases. If the pressure difference exceeds a predetermined value, the process is switched to the back washing step.

(2) Backwashing step First, the on-off valves 21 and 23 are closed to complete the filtration step, and then the pressure of the pressurized fluid of the driving means 29 is adjusted by, for example, an atmospheric discharge valve provided in the pressurized fluid supply means. The compression of each filtration element 15 is released. By this release, each filter element 15 is extended by its spring property,
The gap B between adjacent wheels 6 is enlarged. Further, the piston 16 may be further lowered by lowering the internal pressure on the lower surface side of the piston 16 with respect to that on the upper surface side. Further, it is more effective to change the pressure difference between them and perform the backwashing while periodically expanding and contracting the filtration element. Then, the line between the pipe 22 and the pipe 20 is switched to a cleaning line, and the on-off valves 21 and 23 are opened to supply cleaning water from a cleaning tank (not shown). Washing water flows out 13
Through the filter element 15, and is returned from the lower body 17 through the inflow section 12 to the washing tank. When the back washing is completed, the on-off valves 21 and 23 are closed, the pressure of the pressurized fluid of the driving means 29 is returned to the original pressure, and the process is switched to the filtration step. When a large amount of the filter aid is removed together with the solid content by the back washing, the liquid containing the filter aid is caused to flow in the forward direction before the filtration step as described above, so that the filter aid is attached again.

[0014]

As described above, according to the filter device of the first aspect, the simple structure in which the body 11 itself is also used as a cylinder during backwashing and fluid pressure is applied to a piston sliding on the inner surface thereof. By extending the filtration element, the gap can be opened and backwashing can be performed easily and quickly. And the size of the device can be reduced. Further, a filtration method according to a second aspect uses the filtration device according to the first aspect, filters the fluid in a state where the filtration element is compressed by a piston, and cleans the filtration element in a state where the compression is released. Is performed. Therefore, efficient filtration can be performed, and at the same time, the removability of solids in back washing is increased to shorten the washing time, and the long-term operation efficiency of the filtration device can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a part of a filtration device of the present invention in a cutaway manner.

FIG. 2 is an enlarged view of a part II in FIG.

FIG. 3 is a sectional view showing an example of a conventional filtration element.

FIG. 4 is a partial sectional view showing a conventional filtration device.

DESCRIPTION OF SYMBOLS 1 Filtration element 2 Core 3 Top metal 4 Bottom metal 5 Nut 6 Nut 7 Tube sheet 8 Filtration aid 10 Filtration device 11 Main body 12 Inflow section 13 Outflow section 14 Tube sheet 15 Filtration element 16 Piston 17 Lower trunk Part 18 Upper trunk part 19 Lid part 20 Piping 21 On-off valve 22 Piping 23 On-off valve 24 Mounting hole 25 Mounting hole 26 Wire ring 27 Mounting bracket 28 Connecting member 29 Driving means 30 Pipe 31 Opening / closing valve 32 Sliding contact ring 33 Sealing O ring

[Procedure amendment]

[Submission Date] June 25, 1999 (1999.6.2
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

The present invention according to claim 1 is provided.
Is a tubular main body 11, an inflow portion 12 and an outflow portion 13 of a fluid provided in the main body 11, a tube sheet 14 separating the inflow portion 12 and the outflow portion 13, and one of the tube sheets 14 A plurality of coil-shaped filtration elements 15 having spring characteristics and having ends attached thereto, and an outer surface of the filtration elements 15
A filter aid adhering means for adhering the filter aid to the surface;
Filtration element in a state where a plurality of filtration elements 15 are suspended
Means for adhering solids in the fluid to the outer surface of
And the pressure of the fluid on the inner surface side of the
The solids adhered by pressing relatively to that of the surface side
Filtration device having backwash means for removing
It is a place.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

According to the present invention, the main body 11 is provided.
A disk-shaped piston 16 whose outer periphery slides on the inner surface of the piston;
The fluid pressure applied to the stone 16 is changed,
Driving means 29 to be driven,
The other end is connected to the piston 16.
The filtration device according to claim 1, wherein The present invention according to claim 3 is a coil type having a spring property.
The plurality of filtration elements 15 are connected to the main body 11 by the inflow section 12.
And a filter element attached to a tube sheet
And the filter element 1 attached to the
5. A filter aid adhering step of adhering the filter aid to the outer surface of Step 5.
And the filter element 15 to which the filter aid is attached
Filtration step of attaching solids in the fluid to the surface and filtering
And the pressure of the fluid on the inner surface side of the
The solids adhered by pressing relatively to that of the surface side
A backwashing step for removing
Is the law. The present invention according to claim 4 provides the tube sheet 14 with:
Pis attached to the lower part of the attached filtration element 15
The fluid is filtered while being compressed by the ton 16, and the compression is performed.
Cleaning of the filtration element 15 in the state where the
And a filtering element expanding and contracting step for performing
The filtration method according to claim 3.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

[0014]

According to the filtration device of the first aspect, the filtration is carried out.
The pressure of the fluid on the inner surface side of the excess element 15
Reverse pressure to remove attached solids by applying pressure relative to
Because of the washing means, backwashing can be performed quickly and effectively.
Can be. According to the filtration device of claim 2, backwashing
Sometimes the body 11 itself also serves as a cylinder,
A simple method of applying fluid pressure to the sliding piston 16
Open the gap by extending the filter element by the structure
Backwashing can be performed easily and quickly. And miniaturization of equipment
It can be performed. According to the filtration method of claim 3,
Effectively and quickly removes clogged filtration elements
Can be backwashed. According to the filtration method of claim 4.
In addition to efficient filtration,
The cleaning time is shortened by increasing the releasability of the
The long-term operation efficiency of the device can be improved. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] November 15, 1999 (1999.11.
15)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

According to the first aspect of the present invention, there is provided a tubular main body, an inflow portion and an outflow portion of a fluid provided in the main body, and the inflow portion and the outflow portion. A tube sheet 14 for partitioning the portion 13 and one end of the tube sheet 14 attached to the tube sheet 14, and a wire having a circular cross section is spirally wound.
A plurality of filter element 15 of the coil type having spring property was
A filter aid adhering means for adhering a filter aid to the outer surface of the filter element 15; and a solid content in a fluid adhered to the outer surface of the filter element 15 in a state where a plurality of the filter elements 15 are suspended. A filtering apparatus comprising: a filtering unit; and a backwashing unit that pressurizes the pressure of the fluid on the inner surface side of the filtering element 15 relative to that on the outer surface side to remove the adhered solids. .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

According to the present invention, the main body 11 is provided.
A disk-shaped piston 16 whose outer periphery slides on the inner surface of the filter, and a drive means 29 for changing the fluid pressure applied to the piston 16 to drive the same, and the other end of the filter element 15 is The filtering device according to claim 1, wherein the filtering device is connected to the piston (16). According to the third aspect of the present invention, there are provided a plurality of coil-shaped filtration elements 15 each having a spring property and a spirally wound wire having a circular cross section.
A filter element attaching step of attaching a filter element to a tube sheet 14 that partitions the main body 11 into an inflow section 12 and an outflow section 13, a filter aid attaching step of attaching a filter aid to an outer surface of the attached filter element 15, A filtration step of adhering the solid content in the fluid to the outer surface of the filter element 15 to which the filter aid has been attached and filtering the same; and the pressure of the fluid on the inner surface side of the filter element 15 relative to the outer surface side A backwashing step of removing solids adhered by applying pressure. The present invention according to claim 4, wherein the filter element 15 attached to the tube sheet 14
4. A filter element expanding and contracting step of filtering a fluid in a state where the fluid is compressed by a piston 16 attached to a lower portion of the filter element and performing back washing of the filter element 15 in a state where the compressed state is released. Is a filtration method.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

[0014]

According to the filter device of the first aspect, the cutoff
Filtration element 15 in which a circular surface rod is spirally wound
Used, the pressure of the fluid of the inner surface by applying relatively pressure to that of the outer surface side, has a backwashing means for removing solids deposited. Therefore, the inner side of the filtration element during backwashing
When the fluid flows out of the filter element to the outside,
The fluid is throttled before, and the fluid is
Due to diffusion, it adheres to the entire outer surface of the filtration element.
Solids can be efficiently removed. According to the filter device of the second aspect, the filter element is extended by a simple structure in which the body 11 itself is also used as a cylinder at the time of backwashing, and a fluid pressure is applied to the piston 16 that slides on the inner surface thereof. A gap can be opened and backwashing can be performed easily and quickly. Then, the size of the device can be reduced. According to the filtration method of the third aspect, a wire having a circular cross section is screwed.
Multiple Filtrations of Coil Type with Spiral Wound
By using the element 15, the clogged filtration element can be backwashed effectively and quickly. According to the filtration method of the fourth aspect, it is possible to perform efficient filtration, to enhance the separation of solids in the backwashing, to shorten the washing time, and to improve the long-term operation efficiency of the filtration device. Can be. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 6, 2000 (200.3.6)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005]

According to the first aspect of the present invention, there is provided a tubular main body, an inflow portion and an outflow portion of a fluid provided in the main body, and the inflow portion and the outflow portion. And a plurality of coil-shaped filtration elements 15 having one end attached to the tube sheet 14 and having a circular cross section and spirally wound therearound.
A filter aid adhering means for adhering a filter aid to the outer surface of the filter element 15; and a solid content in a fluid adhered to the outer surface of the filter element 15 in a state where a plurality of the filter elements 15 are suspended. A filtering means, a backwashing means for removing a solid content by pressurizing the pressure of the fluid on the inner surface side of the filtering element 15 relative to that on the outer surface side, and an outer periphery sliding on the inner surface of the main body 11 Disc shaped pis
Tongue 16 and the fluid pressure applied to the piston 16
And a driving means 29 for driving the filter.
The other end of the element 15 is connected to the piston 16.
It is a filtration device characterized by becoming .

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

[0006] The present invention described in claim 2, serial to claim 1
Using the filtration device described above, the outer surface of the filtration element 15
A filter aid adhering step of adhering the filter aid to the surface;
Mounted below filter element 15 mounted on plate 14
Attach the filter aid when compressed by the girder piston 16
The solid content in the fluid on the outer surface of the filtration element 15
Filtration process of attaching and filtering and releasing the compressed state
The pressure of the fluid on the inner surface side of the
The force applied to the solid
And a backwashing step for removing form components.
It is a filtration method.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

[0014]

According to the filtering device according to claim 1 as described above, according to the present invention, at the time of backwashing also serves as a main body 11 itself to the cylinder, simple of adding fluid pressure to the piston 16 in sliding contact with its inner surface structure To extend the filtration element,
The gap can be opened to perform backwashing easily and quickly. Soshi
Thus, the size of the device can be reduced. Claim 2
The filtration method according to claim 1 uses the filtration device according to claim 1.
Filter the fluid while compressing the filter element with a piston.
Filter and release the compression.
It is characterized by performing backwashing. For this reason, efficient filtration can be performed, and at the same time, the solids can be removed in the backwashing , the washing time can be shortened, and the long-term operation efficiency of the filtration device can be improved.

Claims (2)

[Claims] 1. A tubular main body 11, an inflow portion 12 and an outflow portion 13 of a fluid provided in the main body 11, a tube sheet 14 separating the inflow portion 12 and the outflow portion 13, and A coil-type filter element 15 having a spring property with one end thereof attached, a disk-shaped piston 16 whose outer periphery slides on the inner surface of the main body 11, and a fluid pressure applied to the piston 16 are changed. And a drive means 29 for driving the filter element, and the other end of the filter element 15 is connected to the piston 16. 2. Filtering of a fluid using the filtration device according to claim 1 with the filtration element 15 compressed by a piston 16 and cleaning of the filtration element 15 with the compression released. A characteristic filtration method.