JP2001269511A - Laminated filter and filter apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated filter capable of being regenerated by removing a suspended substance accumulated on the filter, excellent in filtering characteristics and mechanical characteristics, low in cost and capable of being manufactured in a small size, and a filter apparatus using the same. SOLUTION: The laminated filter is constituted by alternately laminating a plurality of flat plate-shaped filters 2a, which have a large number of through- holes larger than the particle size of a suspended substance and have discharge side notches and supply side notches at the inner and outer end parts thereof, and a plurality of corrugated filters 2b having spring elasticity. Filter channels are formed by the overlap of the through-holes between the filters 2 and gaps are provided between the filters 2 at the time of regeneration by the spring elasticity of the corrugated filters 2b to form washing liquid channels to realize highly efficient regeneration.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated filter formed by laminating a plurality of flat filter bodies and a filtering device using the same.

[0002]

2. Description of the Related Art A filtration device for removing suspended matter in a liquid to be treated such as sewage or wastewater uses a filtration material having mesh-like pores formed by a hollow fiber membrane or the like. Are known.

[0003] For example, Japanese Patent Application Laid-Open No. 10-52608 discloses that a large number of porous filter media having a large number of fine pores are brought into close contact with each other, and their contact surfaces are laminated so as to be separable. A method is disclosed in which a liquid to be treated is circulated through a porous filter medium to perform filtration.

[0004]

However, the technology of the invention described in the above prior art publication has the following problems.

[0005] (1) The porous filter medium captures the suspension in a state of being compressed by a water flow at a portion of mesh-like pores or depressions smaller than the suspension. It tends to accumulate in parts and cause clogging.

(2) Once the porous filter medium is clogged, it is difficult to remove the suspended matter from the pores and depressions. Therefore, the regeneration rate is low by physical means such as washing with a water stream, and the chemical recovery rate is low. There is no other way but to dissolve using chemicals or replace the filter media.

(3) In order to reduce the size of the filtration material, it is necessary to increase the filtration area and the number of filtration passages per passage area through which the liquid to be treated flows. It is effective to stack many filter bodies within the same height. However, when the thickness of the porous filter material is reduced, the strength is reduced and the porous filter material becomes brittle.

(4) It is difficult to control and control the pore size of the pores or depressions of the porous filter material, and the production method is complicated and the production cost is high.

The present invention has been made to solve the above-mentioned conventional problems, and it is possible to remove and regenerate the suspended matter accumulated in a filter, to have excellent filtration characteristics and mechanical characteristics, to be manufactured at a low cost and in a small size. It is an object of the present invention to provide a laminated filter that can be used and a filtering device using the same.

[0010]

According to the laminated filter of the present invention, a plurality of through-holes having a diameter larger than the particle diameter of the suspension are formed in the direction of the thickness in the direction of the hole axis. A plurality of ring-shaped filter bodies each having a notch formed at an end are laminated, and an inflow portion of the liquid to be treated is provided on one side of the inner and outer laminated surfaces, and an outflow portion of the liquid to be treated is provided on the other side. A laminated filter provided, wherein the filter has a bent portion having a spring elasticity in a thickness direction.

According to the present invention, by providing a gap between the filter bodies of the filter, accumulated suspended matter can be removed and regenerated, and the filter can be excellent in filtration characteristics and mechanical characteristics at low cost. In addition, a laminated filter that can be manufactured in a small size can be provided.

[0012]

DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present invention, a plurality of through-holes having a diameter larger than the particle diameter of the suspension are formed in the thickness direction with the hole axis directed, and the inner peripheral end and the outer peripheral are formed. A plurality of ring-shaped filter bodies each having a notch formed at an end are laminated, and an inflow portion of the liquid to be treated is provided on one side of the inner and outer laminated surfaces, and an outflow portion of the liquid to be treated is provided on the other side. A laminated filter provided, wherein the filter body has a bent portion having spring elasticity in a thickness direction, and has the following operation.

(A) The cross-sectional area of the flow passage of the filtration passage can be set to various sizes depending on the degree of overlap between the openings of the through-holes. By adjusting the ratio and the flow path resistance to the flow of the liquid to be treated, the suspension can be efficiently filtered.

(B) When the liquid to be treated is in a filtration treatment state in which the liquid to be treated is passed through the filtration passage, the suspended matter in the liquid to be treated is formed into a filtration hole formed by the overlap between the through-holes and a vortex formed in the through-hole. Or by being drawn into the stagnation area.

(C) At the time of performing the regeneration treatment of the laminated filter in which the suspended matter is captured, the restraining force in the laminating direction of the filter body is reduced, and the spring elasticity of the filter body causes the filter body to have at least a smaller gap between the laminated bodies than the suspended matter. By providing a large gap, the suspension can be in a state without binding force. By flowing the washing liquid in this state, the suspension can be easily discharged out of the filter.

(D) The filter is made of a metal such as aluminum, copper, iron or stainless steel, or a non-permeable material made of plastic such as polyethylene, polypropylene, polyvinyl chloride or the like. A filter having a large number of holes is used. For example, when a metal such as aluminum is used, the thickness of the filter can be reduced while maintaining the required strength of the filter. When a non-water-permeable material such as plastic is used, processing is easy.

(E) The through hole has a diameter of, for example, 0.1 m.
m or more, it can be manufactured by punching, molding, and the like, and the hole diameter can be easily controlled.

(F) Since the supply holes and the cutouts on the discharge side are formed in the through holes at both ends of the filter, the liquid to be treated is supplied from a direction perpendicular to the lamination direction of the filter. Then, the liquid to be treated, which has been processed through the filtration passage, can be discharged from the opposite side, and the suspension in the liquid to be treated can be removed most efficiently in accordance with the particle diameter, flow rate, etc. The turbid matter can be filtered.

Here, the ring-shaped filter is a plate-like body having an opening in the center, for example, a donut-shaped one in which the inner and outer circumferences are circular, and a triangular or other polygonal shaped inner and outer circumferences. Things included.

The inner peripheral laminated surface and the outer peripheral laminated surface refer to the inner wall surface and the outer wall surface of the laminated ring-shaped filter. Also,
The inner peripheral end and the outer peripheral end refer to inner and outer peripheral edges of the ring-shaped filter. The hole axis of the through hole is a so-called center line connecting the center points of the cross sections of the through hole.

The laminated filter is formed by, for example, laminating 10 to 100 filter bodies in a separable state without using an adhesive or the like.

The pore size larger than the particle size of the suspension refers to the largest average particle size (representative) when the particle size distribution of the substance to be filtered most in the liquid to be treated (assumed removal substance) is taken. On the large particle side on the basis of the value), the particle diameter (the total number of particles, or the so-called relative cumulative frequency) of particles including 40% of the total number of particles on the large particle diameter side (50% in total) is 90%. Since it will be included,
(Referred to as 90% particle size).

For example, if the liquid to be filtered is bath water used in a bathtub, and it is desired to filter turbid substances in the bath water,
Assumed removal substances are oils and fats, sebum cells, etc. (normally,
The size is 5 to 60 μm), and bacteria having different properties (usually 0.3 to 3 μm in size) and large hair are excluded. In the case where the assumed removal substance is a turbid substance, a hole larger than 90% particle diameter of the turbid substance is formed in the filter, whereby a turbid substance or a suspension such as hair larger than the turbid substance is filtered. . In the multilayer filter of the present invention, the number of through holes formed in the filter and the distribution state of the overlapping openings (filtration holes) change depending on the distribution state, and the filtering performance is slightly affected by the properties of the liquid to be treated.
Therefore, when the distribution of the assumed removal substance is unusually spread to the smaller diameter side, it is effective in some cases to reduce the pore diameter to a particle diameter near the representative value.

What should be the diameter of this hole,
Explaining with a specific example, when the liquid to be treated is bath water, the 90% particle size is 30 to 50 μm. As described above, the assumed removal substance is a turbid substance in the bath water and does not filter bacteria. Assuming that a sufficient number of the through holes are evenly distributed, the diameter of the through hole of the filter is preferably about 300 to 700 μm, which is one order larger than the 90% particle diameter.

When the liquid to be treated is tap water, the 90% particle diameter is 5 to 10 μm.
１００100 μm is preferred. Further, in the case where the liquid to be treated is tap water stored water and residual chlorine has escaped, the supposedly removed substance is a bacterium, and the 90% particle diameter is 3 μm. At this time, the diameter of the through-hole of the filter is preferably 20 to 50 μm.

According to a second aspect of the present invention, a plurality of through-holes having a diameter larger than the particle diameter of the suspension are formed with the hole axis directed in the thickness direction, and the through-holes are formed at the inner peripheral end and the outer peripheral end, respectively. A stack in which a plurality of notched ring-shaped filters are laminated, and an inflow portion of the liquid to be treated is provided on one side of the inner peripheral laminating surface and the outer peripheral laminating surface, and an outflow portion of the liquid to be treated is provided on the other side. A filter, wherein the filter has a corrugated structure that is continuous in a direction perpendicular to a direction in which the filter is stacked, and a binding force that tightens in a direction in which the filter is stacked during regeneration. By opening the filter, the corrugated structure provided in the direction perpendicular to the laminating direction of the filter body causes uniform pressure over almost the entire circumference of the filter body between adjacent filter bodies during regeneration. To make the gap between the filter Has an effect of the inside of terpolymers can be uniformly cleaned.

According to a third aspect of the present invention, in the laminated filter according to the second aspect, the corrugated structure of the filter is continuous in a circumferential direction of the filter. By releasing the binding force tightening in the stacking direction of the filter, the cleaning liquid passage connecting the inner circumferential stacking surface side and the outer circumferential stacking surface side of the stacked filter is formed by the corrugated structure provided so as to be continuous in the circumferential direction of the filter. It is provided radially and regularly, and has an effect of preventing a partial short path of the cleaning liquid and uniformly cleaning the inside of the filter.

According to a fourth aspect of the present invention, a plurality of through-holes having a diameter larger than the particle diameter of the suspension are formed with the hole axis directed in the thickness direction, and the through-holes are formed at the inner peripheral end and the outer peripheral end, respectively. A stack in which a plurality of notched ring-shaped filters are laminated, and an inflow portion of the liquid to be treated is provided on one side of the inner peripheral laminating surface and the outer peripheral laminating surface, and an outflow portion of the liquid to be treated is provided on the other side. A filter, wherein the filter according to any one of claims 1 to 3 and a plate-like filter are alternately laminated, wherein a lamination direction of the filter during regeneration is provided. By releasing the binding force
The filter body having spring elasticity always presses the adjacent plate-shaped filter bodies in the laminating direction, and the filter bodies having spring elasticity between all the plate-shaped filter bodies cause a gap due to the bent portion. By providing the cleaning liquid passages in all of the filter stacks, the cleaning liquid can be brought into contact with all the filters without causing a short path in each of the filter gaps, so that the cleaning liquid can be efficiently regenerated.

The invention described in claim 5 is the invention according to claims 1 to 4
And a pair of non-permeable suppressing plates sandwiching the filter according to any one of the above from the upper end and the lower end in the laminating direction of the filter body. The laminated filter has the following effects.

(A) Since the filter body to be laminated is supported on the upper and lower sides by a non-permeable support plate, an inflow portion or an outflow portion can be formed, and the liquid to be treated near the upper or lower surface is short-circuited. This has the effect of preventing passage and preventing the liquid after filtration from escaping to the upper or lower surface.

(B) Even if the laminated filter is placed horizontally,
The filter can be maintained in a laminated state while maintaining the predetermined strength.

(C) By providing a support mechanism capable of freely setting the distance between the non-water-permeable support plates and sandwiching the stacked filter bodies, the flow characteristics of the filtration channel formed in the filter can be improved. By changing it, the accumulated suspension can be efficiently washed and removed, and the particle size and the like of the suspension to be filtered can be selected. Here, the support mechanism for setting the interval between the non-water-permeable support plates can be configured by a screw mechanism or the like that connects the upper and lower non-water-permeable support plates.

The invention according to claim 6 is the invention according to claims 1 to 5
And a filtering device provided with the filter according to any one of the above.

(A) Since it is possible to use a laminated filter in which the pore size of the filter can be easily controlled, it is possible to provide a device having little variation in the filtration process and high regeneration efficiency.

(B) Since the laminated filter can be designed to be small in the laminating direction (thickness direction), the apparatus can be made compact and the filtration apparatus can be operated with a small installation area.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a cross-sectional view of a laminated filter applied to a filtration device according to Embodiment 1 of the present invention, and FIG. 2 is a diagram showing a flow of a liquid to be treated in a laminated body.
FIG.

In FIG. 1, (a) is a sectional view at the time of filtration,
(B) is a sectional view at the time of cleaning.

In FIG. 1A, reference numeral 1 denotes the first embodiment.
2 is a filter body formed in a circular ring shape, 3 is a cylindrical ring-shaped laminate formed by laminating 10 to 50 filter bodies 2, and a flat filter body 2a ( 1 (b)) and a corrugated filter 2b (see FIG. 1 (b)) having a corrugation continuous in the circumferential direction are alternately laminated. Reference numeral 4 denotes a disc-shaped upper surface holding plate, which is a water-impermeable support plate for fixing the upper portion of the laminate 3, and reference numeral 5 denotes a disc-shaped lower surface, which is a water-impermeable support plate for fixing and supporting the lower portion of the laminate 3. The holding plate, 6 is the liquid to be treated
An inflow pipe for introducing into the inside, 7 is an outflow pipe for discharging the filtrate filtered by the laminate 3, 8 is a shaft rotatable having a threaded portion penetrating the center of the upper surface holding plate 4, 9 is a shaft An interlocking gear unit 10 is a motor for rotating the shaft 8 via the gear of the gear unit 9, and a guide 11 is fixed at one end to the lower surface holding plate 5 and penetrates the upper surface holding plate 4.

The filtration device is a device for treating a liquid to be treated such as sewage or waste water and filtering and removing the contained suspended matter by using the laminated filter 1. And the liquid to be treated is supplied using the difference in water level from the storage tank.

As shown in FIG. 1A, during filtration,
A plurality of the filter bodies 2 are stacked with no gap in the thickness direction to form a cylindrical ring-shaped laminate 3. The laminated body 3 is driven by a motor 10 to rotate a shaft 8 via a gear unit 9 to move an upper holding plate 4, which is a water-impermeable support plate, toward a lower holding plate 5 by a screw mechanism. The body 2 is tightly held so as not to form a gap, and the guide 11 suppresses a shift in a direction perpendicular to the stacking direction. At this time, the uppermost filter body 2 of the multilayer body 3 and the upper surface holding plate 4 are in close contact with each other without any gap. Similarly, the filter body 2 at the lowermost surface of the laminate 3 and the lower surface holding plate 5 are in close contact with each other without any gap.

The outflow portion of the present embodiment is formed by the internal space formed by the upper surface pressing plate 4, the lower surface pressing plate 5, and the inner peripheral lamination surface of the laminate 3, and the outflow pipe 7.

The distance between the upper surface holding plate 4 and the lower surface holding plate 5 which sandwich the laminated body 3 can be freely adjusted by a screw mechanism. it can.

Further, the lower surface holding plate 5 guides the liquid to be treated to the outside of the laminated filter 1 at an inner portion of the inner peripheral laminated surface of the filter 2 not in contact with the lowermost filter 2. A tube 7 is provided.

At this time, the liquid to be treated is introduced into the laminated filter 1 from the inflow pipe 6, flows into the laminated body 3 from the outer peripheral lamination surface of the laminated body 3, and captures the suspended material in the laminated body 3. When the liquid reaches the lamination surface, it becomes a clear filtrate and is discharged from the outflow pipe 7.

At the time of reproduction, as shown in FIG.
By rotating the motor 10 in the reverse direction, the upper holding plate 4 is moved away from the lower holding plate 5 by a screw mechanism,
The upper surface holding plate 4 is stopped at a position where a gap is provided between the respective filter bodies 2, and the distance L between the upper surface holding plate 4 and the lower surface holding plate 5 is fixed.

At this time, the washing liquid flows into the laminated filter 1 from the outflow pipe 7, flows into the laminated body 3 from the inner peripheral laminated surface of the laminated body 3, and is washed out of the suspended matter trapped in the laminated body 3. It reaches the outer peripheral laminated surface and is discharged from the inflow pipe 6.

As described above, by changing the rotation direction of the motor 10 and freely adjusting the distance L between the upper surface holding plate 4 and the lower surface holding plate 5 of the laminated body 3, the spring elasticity of the corrugated filter 2b at the time of reproduction is improved. Can be opened and closed to open and close the gap between the respective filter bodies 2.

FIG. 2 is a partially enlarged perspective view of the laminate 3 during reproduction.

The washing liquid flows from the outflow pipe 7 and flows into the inside of the laminate 3 through the internal space surrounded by the inner peripheral lamination surface of the filter 2. At the time of regeneration, the gap L between the upper surface holding plate 4 and the lower surface holding plate 5 is enlarged by a screw mechanism, so that the corrugated filter 2b
The gap is provided between the filter bodies 2 by expanding the gap with the flat filter body 2a by spring elasticity. The suspension trapped in the filter 2 is washed away while flowing through the washing liquid passage 12 formed in the gap between the filters, and flows out of the laminate 3.

FIG. 3 is a perspective view of the filter 2 constituting the laminate 3. FIG. 3A shows a flat filter body 2a,
(B) shows a corrugated filter 2b having a corrugated structure that is continuous in the circumferential direction.

FIG. 4 is a partially enlarged view of the surface of the filter 2.

The flat filter 2a is a circular ring filter and is flat. The corrugated filter 2b has a corrugated structure continuous in the circumferential direction of the circular ring-shaped filter,
When it is pressed in the thickness direction and deformed into a flat plate shape, it has the same shape as the flat filter body 2a. The pressure required to deform the corrugated filter 2b into a flat plate shape is
It can be changed by the material of b, the pitch of the wave, the height from the bottom to the top of the wave, and the like.

As shown in FIG. 4, these filter bodies 2
A large number of through-holes 13 having a diameter D whose hole axes are oriented in the thickness direction are provided, and a filtration passage is formed in the laminated body 3 by overlapping the through-holes 13. Through hole 1 provided in filter 2
3 is formed such that the distance P between the centers of the through holes 13 adjacent to each other is 1.2 to 1.8 times the diameter D of the through holes 13. The diameter D is 0.4 to the thickness T of the filter 2.
It is set to be in a range of up to 1.0 times.

By the combination of the hole diameter D and the pitch P (distance between centers of adjacent through holes) of the through holes 13, the shape of the filtration passage formed by the overlap and the diameter of the filtration holes can be changed.

FIG. 5 is a partially enlarged view of the laminate 3 at the time of filtration.

The laminate 3 is formed by exposing a large number of discharge side notches 14 on the inner peripheral laminated surface and exposing a large number of supply side notches 15 on the outer peripheral laminated surface. An outflow portion 16 that covers the inner peripheral laminated surface of the laminate 3 and can collect the liquid to be treated after filtration, and an inflow portion 17 that covers the outer peripheral laminated surface and can supply the liquid to be treated, Provided for water flow. As described above, in the multilayer filter 1 of the first embodiment, the liquid to be treated flows in from the inflow portion 17 on the outer periphery of the multilayer body 3 and is discharged from the outflow portion 16 inside. In addition, the flow direction of the liquid to be treated is reversed,
It is also possible to provide an inflow section inside and outflow from an outflow section provided outside. At this time, the positions of the supply side notch 15 and the discharge side notch 14 are reversed, and the supply side notch 15
Are formed at the inner peripheral end of the filter body 2 and the discharge side notch 14
Is formed at the outer peripheral end of the filter body 2. In the laminated filter 1 in this case, many supply-side cutouts 15 are exposed on the inner peripheral laminated surface, and many discharge-side cutouts 14 are exposed on the outer peripheral laminated surface. Providing the inflow portion 17 on the outer periphery can increase the filtration area at the time of inflow, and can slightly increase the time until regeneration. However, which one of the inflow portions 17 should be selected may be selected from the positional relationship of the piping and the like.

The liquid to be treated is placed on the outer periphery (or inner periphery) of the filter 2.
From the supply cutout 15 at the end, the filter body 2 flows into the filtration passage communicating with the discharge cutout 14 while being narrowed by the overlap of the through holes 13 formed by stacking the filter bodies 2. The inflowing water to be treated is deposited on the laminated filter 2
Flows into another opening (filtering hole) formed further overlapping with the through hole 13 of FIG. As described above, thereafter, through the filtration passage formed by the overlap of the openings of the through holes 13, the liquid finally reaches the discharge side notch 14 at the inner (or outer) end.

The filter 2 has a ring shape made of a plastic material such as polyethylene, polypropylene and polyurethane.

In the present embodiment, the inner and outer circumferences are of a donut shape having a circular shape. Instead of this, various shapes such as a triangle and a quadrangle can be used according to the application.

FIG. 6 is a perspective view of a filter provided with a corrugated structure in one direction, FIG. 7 is a perspective view of a filter which is entirely curved, and FIG.
FIG. 4 is a perspective view of a filter provided with a cut-and-raised portion.

The shape of the corrugated filter 2b is not limited to this embodiment. For example, a corrugated structure having a corrugated structure in one direction as shown in FIG. 6 or a filter as shown in FIG. The entire 2 may be curved. Alternatively, it can be formed by providing a cut and raised portion as shown in FIG.

FIG. 9 is an enlarged cross-sectional view of FIG. 5 showing a mechanism for filtering a suspension, and shows a mechanism for filtering a suspension contained in a liquid to be treated.

When the liquid to be treated passes through the filtration passage formed by the overlap of the through holes 13, the adjacent through holes 1
A suspension larger than the overlap opening (filtration hole) of the three
It is trapped because it cannot pass through this part. The filtration holes have various diameters including fine holes depending on the degree of overlap between the through holes 13.

Due to the difference between the size of the formed filtration hole and the diameter of the through hole 13, the velocity distribution of the liquid flow inside the through hole 13 is not uniform. Thereby, the through hole 1
Inside 3, stagnation areas and vortices of the flow are generated. Small suspensions are also trapped by being drawn into these pools.

The suspension is trapped in the through-hole 13 of the filter body 2 by the two mechanisms described above.

FIG. 10 is an enlarged sectional view of the laminate 3 showing the regeneration mechanism of the laminated filter 1.

As shown in FIG. 10, at the time of regeneration, the distance between the upper surface holding plate 4 and the lower surface holding plate 5 is adjusted by using a screw mechanism, and the gap H between each filter 2 is larger than at least the suspended material. Is provided. As a result, the suspended matter trapped in the through-hole 13 is in a free state without any restraint. In this state, by flowing a washing solution or the like, the suspended matter is filtered from the through-hole 13 through the filter 2. It easily exits toward the gap between and flows out of the laminate 3.

FIG. 11 shows a one-to-one relationship between the inlet and the outlet of the through hole 13.
FIG. 3 is a schematic diagram showing a flow of a liquid to be treated in a case where the liquid is not processed. When the cleaning liquid or the like enters the through-hole 13 from above, the flow is disturbed at the branch portion, so that the velocity distribution is not uniform. As a result, a flow stagnation area and a vortex are generated inside the through-hole 13. If the suspended matter is taken into this, it is difficult to get out of the through-hole 13, so that the inlet and the outlet have
It is desirable to adopt a straight shape that does not branch.

The straight hole may be a hole having a taper. If the inlet and the outlet correspond one-to-one, the hole may have a branch passage which does not communicate with the outside.

FIG. 12 is a schematic diagram showing the flow of the liquid to be treated when the through holes are not identical in the thickness direction. When the liquid enters the through hole 13 from above, the flow is disturbed at the widening portion or the narrow portion, so that the velocity distribution is not uniform. As a result, a flow stagnation area and a vortex are generated inside the through-hole 13. When the suspension is taken into this, the through hole 1
3, it is desirable that the through-hole 13 has the same cross-sectional shape in the hole axis direction.

The multilayer filter 1 and the filtering device according to the first embodiment have the following functions because they are configured as described above.

(1) The flow passage cross-sectional area of the filtration passage can be set to various sizes depending on the degree of overlap between the openings of the through-holes. By adjusting the ratio and the flow path resistance to the flow of the liquid to be treated, the suspension can be efficiently filtered.

(2) When the liquid to be treated is in a filtration treatment state in which the liquid to be treated flows through the filtration passage, the suspended matter in the liquid to be treated is swirled into the filtration holes formed in the through holes and the through holes formed by the overlap between the through holes. And in the area of the stagnation area.

(3) At the time of performing the regeneration treatment of the laminated filter in which the suspended matter is captured, by providing at least a gap larger than the suspended matter between the laminated layers of the filter due to the elasticity of the filter. The object can be in a state without binding force. By flowing the washing liquid in this state, the suspension can be easily discharged out of the filter.

(4) Since there is a support mechanism capable of freely setting the interval between the non-water-permeable support plates, the flow characteristics in the filtration flow path inside the laminate are changed, and the accumulated suspension is removed. Efficient washing and removal can be performed, and the particle size of the suspension to be filtered can be selected.

(Embodiment 2) FIG. 13 is a cross-sectional view showing a flow of a liquid to be treated in a multilayer filter according to Embodiment 2 of the present invention.

In FIG. 13, reference numeral 13 denotes a through hole provided in the filter, and reference numeral 18 denotes a depression provided on the wall surface of the filtration passage other than the through hole 13.

Since the multilayer filter of the second embodiment is configured as described above, the following functions are provided.

In the case where the filter body 2 has no depression as in the first embodiment, the filtration passage is interrupted where there is no overlap between the through holes 13. However, as shown in FIG.
Has a depression 18 in the first embodiment, the filtration passage is narrowed or cut off in the first embodiment.
As a result, the flow passage cross-sectional area can be partially enlarged to form a filtration passage having a small water flow resistance. Therefore, the liquid to be treated can be supplied to the filtration device with low energy to perform the filtration treatment, and the operation can be performed economically and efficiently.

(Embodiment 3) FIG. 14 is a sectional view showing a flow of a liquid to be treated in a multilayer filter according to Embodiment 3 of the present invention.

In FIG. 14, 13 is a through hole provided in the filter, 18 is a recess provided in the wall of the filtration passage other than the through hole 13, and 19 is an adjacent through hole formed in a direction along the stacking direction of the stack. 13 are horizontal through-holes connecting between the holes 13.

Since the laminated filter of the third embodiment has the above configuration, it has the following operation.

As in the first embodiment, the filter 2 is
Alternatively, when the through-hole 13 is not provided in a direction other than the thickness direction, the filtration passage is interrupted at a place where there is no overlap between the through-holes 13. However, as shown in FIG. 14, when the hollow 18 or the horizontal through hole 19 other than the thickness direction is formed in the filter body 2, the flow path resistance of the liquid to be treated can be further reduced, and the liquid to be treated is supplied to the filtration passage with low energy. Can be flushed.

[0085]

As described above, according to the present invention, it is possible to provide a resource-saving type laminated filter which requires a small amount of energy for regeneration, has a high energy saving effect, and does not require replacement of the filter due to clogging. In addition, there is no restriction on the direction of filtration (flow of liquid) or the direction of mounting the filter, so that it is possible to achieve an excellent effect that the size can be reduced and the production is easy.

That is, according to the invention described in claim 1, the following effects (a) to (d) can be obtained.

(A) The cross-sectional area of the flow passage of the filtration passage can be set to various sizes according to the degree of overlap between the openings of the through-holes. By adjusting the ratio and the flow path resistance to the flow of the liquid to be treated, the suspension can be efficiently filtered.

(B) When the liquid to be treated is in the filtration treatment state in which the liquid to be treated is passed through the filtration passage, the suspended matter in the liquid to be treated is removed by filtration holes and / or through holes formed by the overlap between the through holes. It can be trapped by being drawn into the vortex or stagnation area formed inside.

(C) At the time of performing the regeneration treatment of the laminated filter in which the suspended matter is captured, the gap between the laminated layers of the respective filter bodies is at least larger than that of the suspended matter due to the spring elasticity of the filter body. The object can be in a state without binding force. By flowing the washing liquid in this state, the suspension can be easily discharged out of the filter.

(D) It can be manufactured by punching, die molding, etc., and the hole diameter can be easily controlled.

According to the second aspect of the present invention, by releasing the restraining force for tightening the filter in the stacking direction at the time of regeneration, the corrugated structure provided in the direction perpendicular to the stacking direction of the filter is provided. At the time of regeneration, uniform pressure is generated over substantially the entire circumference of the filter between adjacent filter bodies, so that the gap between the filter bodies is uniformed and the inside of the filter can be uniformly washed.

According to the third aspect of the present invention, by releasing the restraining force for tightening the filter in the laminating direction at the time of regeneration, the corrugated structure provided so as to be continuous in the circumferential direction of the filter is formed. The cleaning liquid passage connecting the inner peripheral laminating surface side and the outer peripheral laminating surface side of the filter is regularly provided in a radial manner, so that a short path of the cleaning liquid can be prevented and the inside of the filter can be uniformly cleaned.

According to the fourth aspect of the present invention, by releasing the restraining force for tightening the filter body in the laminating direction at the time of regeneration, the filter body having spring resilience is always stacked with respect to the adjacent flat filter body in the laminating direction. And the filter body having spring elasticity between all the plate-like filter bodies causes a gap due to the bent portion, and the washing liquid is short-passed by providing a washing liquid passage in all the filter body lamination gaps. An effect that the filter can be efficiently regenerated by contacting with all the filter bodies without any problem can be obtained.

According to the invention of claim 5, in addition to the above, the following effects (a) to (c) can be obtained.

(A) Since the filter body to be laminated is supported on the upper and lower sides by a non-permeable support plate, an inflow portion or an outflow portion can be formed, and the liquid to be treated near the upper or lower surface thereof is short-circuited. This has the effect of preventing passage and preventing the liquid after filtration from escaping to the upper or lower surface.

(B) Even if the laminated filter is placed horizontally,
The filter can be maintained in a laminated state while maintaining the predetermined strength.

(C) By providing a support mechanism capable of freely setting the distance between the non-water-permeable support plates and sandwiching the stacked filter bodies, the flow characteristics of the filtration channel formed in the filter can be improved. By changing it, the accumulated suspension can be efficiently washed and removed, and the particle size and the like of the suspension to be filtered can be selected. Here, the support mechanism for setting the interval between the non-water-permeable support plates can be configured by a screw mechanism or the like that connects the upper and lower non-water-permeable support plates.

According to the invention described in claim 6, the following effects (a) and (b) can be obtained.

(A) Since a laminated filter in which the pore size of the filter can be easily controlled can be used, it is possible to provide an apparatus with little variation in filtration processing and high regeneration efficiency.

(B) Since the laminated filter can be designed to be small in the laminating direction (thickness direction), the apparatus can be made compact and the filtration apparatus can be operated with a small installation area.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a multilayer filter applied to a filtration device according to Embodiment 1 of the present invention.

FIG. 2 is a partially enlarged perspective view of FIG. 1 showing a flow of a liquid to be treated inside a laminate.

FIG. 3 is a perspective view of a filter constituting a laminate.

FIG. 4 is a partially enlarged view of the surface of a filter body.

FIG. 5 is a partially enlarged view of a laminate during filtration.

FIG. 6 is a perspective view of a filter provided with a corrugated structure in one direction.

FIG. 7 is a perspective view of a filter body which is entirely curved.

FIG. 8 is a perspective view of a filter provided with a cut-and-raised portion.

FIG. 9 is an enlarged cross-sectional view of FIG. 5, showing the mechanism by which the suspension is filtered.

FIG. 10 is an enlarged sectional view of a laminate showing a regeneration mechanism of the laminate filter.

FIG. 11 is a schematic view showing the flow of a liquid to be treated when the inlet and the outlet of the through-hole 13 are not one-to-one.

FIG. 12 is a schematic diagram showing the flow of a liquid to be treated when the through holes are not identical in the thickness direction.

FIG. 13 is a cross-sectional view showing a flow of a liquid to be treated in the multilayer filter according to the second embodiment of the present invention.

FIG. 14 is a cross-sectional view showing a flow of a liquid to be treated in a multilayer filter according to Embodiment 3 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Laminated filter 2 Filter body 2a Flat filter body 2b Corrugated filter body 3 Laminated body 4 Upper surface restraint plate 5 Lower surface restraint plate 6 Inflow pipe 7 Outflow pipe 8 Shaft 9 Gear part 10 Motor 11 Guide 12 Cleaning liquid passage 13 Through hole 14 Discharge Side cutout 15 Supply cutout 16 Outflow section 17 Inflow section 18 Depression 19 Horizontal through hole

Claims (6)

[Claims] 1. A ring in which a plurality of through-holes having a diameter larger than the particle diameter of the suspension are formed with the hole axis oriented in the thickness direction, and notches are formed at the inner peripheral end and the outer peripheral end, respectively. A multilayer filter in which a plurality of filter bodies each having a shape of a liquid are laminated, and an inflow portion of a liquid to be treated is provided on one side of an inner peripheral laminating surface and an outer peripheral laminating surface, and an outflow portion of the liquid to be treated is provided on the other side. A laminated filter, wherein the body has a bent portion having a spring elasticity in a thickness direction. 2. A ring in which a plurality of through-holes having a diameter larger than the particle diameter of the suspension are formed with the hole axis oriented in the thickness direction, and notches are formed at the inner peripheral end and the outer peripheral end, respectively. A multilayer filter in which a plurality of filter bodies each having a shape of a liquid are laminated, and an inflow portion of a liquid to be treated is provided on one side of an inner peripheral laminating surface and an outer peripheral laminating surface, and an outflow portion of the liquid to be treated is provided on the other side. A laminated filter, wherein the body has a corrugated structure that is continuous in a direction perpendicular to the laminating direction of the filter. 3. The multilayer filter according to claim 2, wherein the corrugated structure of the filter is continuous in a circumferential direction of the filter. 4. A ring in which a plurality of through-holes having a diameter larger than the particle diameter of the suspension are formed with the hole axis oriented in the thickness direction, and cutouts are formed at the inner peripheral end and the outer peripheral end, respectively. A multilayer filter in which a plurality of filter bodies each having a plurality of shapes are laminated, and an inflow portion of the liquid to be treated is provided on one side of the inner peripheral laminating surface and the outer peripheral laminating surface, and an outflow portion of the liquid to be treated is provided on the other side. Item 4. A laminated filter, wherein the filter body and the flat filter body according to any one of Items 1 to 3 are alternately laminated. 5. A laminated filter comprising a pair of non-permeable suppressing plates for sandwiching the filter according to any one of claims 1 to 4 from an upper end and a lower end of the filter body in a laminating direction. 6. A filtering device comprising the filter according to claim 1.