JP2001205013A - Laminated filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact laminated filter thigh in regeneration efficiency and easy to manufacture. SOLUTION: A plurality of ring-shaped filter elements 1, each of which has a large number of through-holes 6 having a hole size larger than the particle size of a suspended substance formed therein so that the hole axes of them is turned in the thickness direction of the filter element and has notches 5-1, 5-2 formed to the inner and outer peripheral end parts thereof, are laminated and an inflow part of a liquid to be treated is provided on the side of one of the inner and outer peripheral lamination surfaces of each filter element and an outflow part of the liquid to be treated is provided on the side of the other one for them. The filter elemets 1-1 have at least two kinds of non-circular ring shapes and are laminated so that the center positions of them are allowed to coincide with each other and the through-holes 6 are partially exposed to the inner and outer peripheral lamination surfaces of the filter elements other than the notches 5-1, 5-2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated filter for purifying water and other fluids, in which a plurality of filter bodies having a ring-like planar shape are laminated.

[0002]

2. Description of the Related Art Conventionally, a filtering device has been used in which a laminated filter is formed by laminating a plurality of flat filter bodies, and a liquid to be treated is introduced and filtered from a direction perpendicular to the laminating direction of the filter bodies. ing. As such a laminated filter, there is a filter described in, for example, JP-A-10-52608. As disclosed in this publication, a filter having fine pores such as a porous filter medium is generally used as a filter.

[0003]

However, the porous filter material conventionally used as a flat filter has fine pores and depressions smaller than the suspended material, and the suspended material has water flowing through the pores and depressions. And is captured in a compressed state. Therefore, the filter body made of the porous filter medium is easily clogged. In the case of clogging, the rate of regeneration is low by water flow or other physical means, and the only alternative is to use chemicals or replace the filter.

Further, in order to reduce the size of the laminated filter, it is necessary to increase the filtration area, the passage, and the inflow and outflow holes of the liquid to be treated. In order to increase the number of inflow holes and outflow holes, it is effective to reduce the thickness of each filter and to stack many filters at the same height in the stacking direction. However, when the porous filter medium has a small thickness or a thin solid portion that supports the pores, the filter body becomes brittle, resulting in insufficient strength.
Furthermore, it is very difficult to control and manage the pore size of the micropores and depressions of the porous filter medium, and the production method is also complicated and complicated.

[0005] As described above, the conventional laminated filter using the porous filter medium as a filter has a problem that the regeneration rate of the clogging treatment is low and the obstacle in the production is large.

An object of the present invention is to provide a laminated filter for purifying fluid which is high in regeneration rate, compact and easy to manufacture.

[0007]

According to the present invention, a plurality of through-holes having a diameter larger than the particle size of the suspension are formed with the hole axis oriented in the thickness direction, and are formed at the inner peripheral end and the outer peripheral end. A plurality of non-circular ring-shaped filters each having a notch 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 disposed on the other side. Wherein the filter body has two or more types of non-circular ring shapes and is laminated so that the center positions thereof are coincident with each other, and the cut surface is formed on the inner peripheral laminated surface and the outer peripheral laminated surface. In addition to the notch, the through hole is partially exposed.

According to the present invention, it is possible to obtain a laminated filter for fluid purification which has a high regeneration rate, is compact and easy to manufacture.

[0009]

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 non-circular 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 peripheral laminated surface and the outer peripheral laminated surface, and an outflow of the treated liquid is distributed on the other side. Parts are provided, respectively, wherein the filter is 2
At least two types of non-circular ring-shaped shapes are stacked so that their center positions are aligned, and the inner peripheral laminated surface and the outer peripheral laminated surface are partially exposed to the through holes in addition to the cutouts. It is a laminated filter characterized by the fact that at the time of filtration,
In the filtration passage formed by the overlap of the through holes, a hole smaller than the suspension is formed according to the degree of overlap of the through holes, and an inflow hole and an outflow hole are formed by communicating part of the through holes with the outside. In addition, at the time of regeneration, by providing a sufficient gap between the laminations of the filter, there is an effect that the suspension can be regenerated in a free state without binding force.

Here, in the present invention, the hole axis is a line segment connecting the centers of the cross sections of the through holes, that is, the center axis.
The center position is the center of the inscribed circle of each ring. In addition, the ring shape includes not only a circle but also a polygon,
The non-circular ring shape means a polygon having an outer shape other than a circle.

The through-holes larger than the particle diameter of the suspension are defined as the largest number of average particles when the particle size distribution of the substance to be filtered (assumed removal substance) in the liquid to be treated is taken. On the large particle diameter side based on the diameter (representative value), 40% of the total number of particles on the large particle diameter side (50% as a whole).
%, The pores having a diameter larger than the particle diameter containing 90% (90% is included in the total number). For example, if the liquid to be filtered is bath water and the turbid substance in the bath water is to be filtered, the assumed removal substance is oil or fat or sebum cells (usually 5 to 60 μm in size) coming out of the body. Bacteria with different properties (usually 0.3 to 3 μm in size) and large hairs are excluded. In the case where the assumed removal substance is a turbid substance, a through-hole larger than 90% particle diameter of the turbid substance is filtered to remove a turbid substance and a larger suspension such as hair. In the laminated filter of the present invention, the distribution of the overlapping openings (filtration holes) varies depending on the number and distribution of through-holes formed in the filter, and is also affected by the properties of the liquid to be treated. Therefore, when the distribution of the assumed removal substance is abnormally widened to the smaller diameter side, it is effective in some cases to reduce the diameter of the through-hole to a particle diameter near the representative value.

The diameter of the through-hole should be set as a specific example. If the liquid to be treated is bath water, the 90% particle diameter 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 uniformly 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 size is 5 to 10 μm.
m, the diameter of the through-hole of the filter at this time is 50 to 100 μm
Is good. In addition, when the liquid to be treated is water in which residual chlorine has escaped by storing tap water, the assumed removal substance becomes bacteria,
The 90% particle size is 3 μm. At this time, it is preferable that the through hole of the filter has a diameter of 20 to 50 μm.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view of a laminated filter according to an embodiment of the present invention, and FIG. 2 is an enlarged view showing a cross section of a portion surrounded by a circle A in FIG. FIG. 3 is a plan view showing a filter having a rectangular saw blade-like inner periphery and outer periphery incorporated in the laminated filter of FIG.

In FIG. 1, a laminated filter 2 according to the present embodiment has an annular filter body 1 having a uniform thickness, and has a plane shape shown in FIG. It is laminated as a combination with the filter body 1-1. The laminated filter 2 forms the outer peripheral laminated surface 2-1 and the inner peripheral laminated surface 2-2 as the inflow surface or the outflow surface of the liquid to be treated by these filter bodies 1 and 1-1, respectively, and seals the upper and lower ends respectively. The filter bodies 1 and 1-1 are squeezed and held by the upper surface pressing plate 3-1 and the lower surface pressing plate 3-2 arranged in the state. Further, a pipe line 4 is sealingly connected to the lower surface holding plate 3-2 so as not to interfere with the filter 1. The liquid to be treated flows into the inside of the multilayer filter 2 from the outside and is discharged from the pipe 4, or conversely, the liquid to be treated is supplied from the pipe 4 and discharged from the inside of the multilayer filter 2 to the outside. And

Each of the two types of filters 1, 1-1 is shown in FIG.
As shown in the figure, a large number of minute through holes 6 are opened in the thickness direction with the hole axis directed, and a number of notches are formed at the inner peripheral end and the outer peripheral end, respectively. As shown by an alternate long and short dash line in FIG. 3, it has an annular planar shape and has a uniform overall thickness. Further, the other filter body 1-1 is annular as shown in FIG. 3, but each of the outer peripheral edge and the inner peripheral edge has an outer diameter of a rectangular saw blade shape and is formed as a uniform series of projections and recesses. Have been. In the example of FIG. 3, the outer diameter and the inner diameter of a virtual circle drawn by the tip of each of the outer peripheral edge and the inner peripheral edge of the filter body 1-1 are equal to the outer diameter and the inner diameter of the annular filter body 1. That is, when the other filter body 1-1 is concentrically sandwiched between the two filter bodies 1, the annular filter body 1 has a filter body 1 having projections and recesses.
-1 so that the concave portion of the filter body 1-1 faces outward from between the filter bodies 1 and 1-1.

In the above configuration, as shown in FIG. 2, the liquid to be treated is introduced in a direction perpendicular to the outer laminated surface 2-1 of the laminated filter 2, filtered inside the laminated filter 2, and The liquid flowing to the surface 2-2 and being filtered is discharged through the line 4 (see FIG. 1). In the filtration of the liquid to be treated, the liquid to be treated flows into the inside of the filter 2 from the notch 5-1 facing the outer periphery of the filter 1 as shown in FIG. The inflowing treated water flows into the filtration passage formed by the through hole 6 overlapping the notch 5-1.
It reaches into the through hole 6 of the upper or lower filter. That is, the number of the through holes 6 overlapping the notch 5-1 is the number of the inflow holes.
The liquid to be treated flowing from the notch 5-1 travels through the laminated filter 2 and matches one with the notch 5-2 on the inner peripheral end formed similarly to the notch 5-1 on the outer peripheral surface side. The partially exposed through-hole 6 serves as an outflow hole, and is discharged into the multilayer filter 2.

On the other hand, a filter body 1 having rectangular saw blade-shaped projections and concave portions formed on the outer peripheral edge and the inner peripheral edge shown in FIG. 3, respectively.
When the filter body 1 is sandwiched between the annular filter bodies 1, the concave portion of the filter body 1 enters from the outer periphery and the inner periphery of the filter body 1. Therefore, the through holes 6-1 and 6-2 (see FIG. 2) of the pair of filter bodies 1 sandwiching the upper and lower sides of the filter body 1-1 directly communicate with the outside, so that these through holes 6-1 and 6 are formed. -2 serves as an inflow hole and an outflow hole for the processing solution passing in the thickness direction of the laminated filter 2. As a result, it is possible to increase the number of inflow holes and outflow holes of the liquid to be treated, which is applied to the laminated filter 2.

Here, as the filter body 1-1, various types can be used instead of the planar shape shown in FIG. FIG.
FIG. 5, FIG. 6, FIG. 7, and FIG. 8 are plan views showing different forms of the filter. For example, as shown in FIG. 4, a filter body 1-1 provided with only protrusions on the inner and outer circumferences,
It may be a combination of a circle and a regular polygon as shown in FIG. 5, a circle and a star as shown in FIG. 6, or a combination of a circle and other figures as shown in FIG. In addition, the filter body 1-1 to be combined is not limited to a circular shape only, and any combination may be used as long as the same unevenness as the cutout portion or the protruding portion is formed at the end by the combination of the filter bodies 1-1. Thus, for example, all the filters are shown in FIG.
Even if the filter body 1-1 shown in FIG. 1 is laminated by being shifted in the circumferential direction by a predetermined angle around the center point C-1 of the filter body in the range surrounded by the outer end, the cutout portion or the protrusion is formed. It is possible to form the same irregularities as the part.

It is not necessary that the cutouts and protrusions of the filter body be provided uniformly at the ends, but may be provided only at a part of the ends. Further, the notch or the protruding portion does not need to be provided at both the inner peripheral end and the outer peripheral end, and can be provided only at the outer peripheral end as shown in FIG. 8, for example, and can be adjusted as necessary. It is. Further, the notch portion is the filter 1
By providing a through hole up to the end of the filter, it is possible to provide unevenness like a notch, and by using a filter of this structure, it becomes possible to stack the filter so that the ends of all the filters are substantially aligned. , To facilitate the manufacture of the filter.

FIG. 9 is an enlarged view of a portion surrounded by a circle H in FIG. 2, and is a schematic view showing a mechanism for filtering a suspension contained in the liquid to be treated. As shown in the drawing, when the liquid to be treated, which proceeds in the direction of the arrow, passes through the overlapping portion of the through-holes 6 of the stacked filter 1 (, 1-1), the filtering hole, that is, the overlapping portion of the upper and lower through-holes 6 is higher than the overlapping portion. Large suspensions are trapped without being able to pass through the filtration holes. Further, the opening area of the filtration hole formed by the overlap of the through holes 6 can be increased or reduced depending on the degree of overlap. Therefore, due to the difference between the size of the formed filtration hole and the size of the through hole 6, the velocity distribution of the flow of the liquid to be treated is not uniform inside the through hole 6, and the through hole 6
Flow stagnation and vortices occur inside. The stagnation or vortex of the flow of the liquid to be treated thus generated acts to draw a small suspension therein, and the suspension is also trapped by this drawing. The suspension is trapped in the through-hole 6 of the filter 1 by the above mechanism.

Here, the multilayer filter 2 is formed by exposing a large number of cutouts 5-2 on the discharge side on the inner peripheral laminated surface 2-2, and the cutout 5-1 on the supply side is formed on the outer peripheral laminated surface 2-1. Are exposed (see FIG. 2). Outflow portion which can cover the inner peripheral laminated surface 2-2 of the laminated filter 2 and collect the liquid to be treated after filtration, and the outer peripheral laminated surface 2-1
An inflow portion that can supply the liquid to be treated by covering is provided for water flow. In the present embodiment, the upper holding plate 3
-1 and lower surface plate holding plate 3-2 and inner peripheral laminated surface 2 of filter 1
The space surrounded by 2 forms an outflow portion together with the discharge pipe connected to the space. Although the inflow portion is not shown in FIG. 1, it may be any one as long as a cover that covers the outer peripheral laminated surface 2-1. As described above, the multilayer filter 2 of the present embodiment is configured to flow in from the inflow portion on the outer periphery of the multilayer filter 2 and discharge from the internal outflow portion. However, it is also possible to provide an inflow portion inside the laminated filter 2 with the flow direction reversed, and to discharge from the outflow portion provided outside. At this time, the position of the cutout on the supply side and the cutout on the discharge side are reversed, the cutout on the supply side is formed at the inner peripheral end of the filter 1, and the cutout on the discharge side is the outer end of the filter 1. Part will be formed. In the laminated filter 2 in this case, a number of cutouts on the supply side are exposed on the inner peripheral laminated surface 2-2, and a number of cutouts on the discharge side are exposed on the outer peripheral laminated surface 2-1. Providing the inflow portion on the outer periphery can increase the filtration area at the time of inflow, and can slightly increase the time until regeneration. However, which of the inflow portions may be selected from the arrangement relationship of the pipes and the like.

FIG. 10 is an enlarged view of a main part showing a procedure of regeneration of the filter.

When the adhering suspended matter is removed from the filter bodies 1 and 1-1 for regeneration, at least a gap is provided between the filter bodies 1 and larger than the suspended matter, and the suspended matter trapped in the through-hole 6 is formed. Release constraints on things. When the liquid is flowed in this state, the suspension quickly flows out of the through-hole 6 into the gap between the filter bodies 1 and flows out of the laminated filter 2 to be regenerated.
By providing a gap between the filter bodies 1 in this manner, a filter having a very high regeneration rate under low energy can be realized.

FIG. 11 is a cross-sectional view of a main part of a filter provided with a through hole having one inlet and two outlets. As shown in the drawing, when the through-hole 6 liquid enters from the upper side, the velocity distribution becomes non-uniform due to the disturbance of the flow at the branching portion before the two outlets. As a result, a stagnation or vortex of the flow is generated inside the through-hole 6, and it is difficult for the suspended matter to be taken out of the through-hole 6 when the suspended matter is taken into this. Therefore, the regeneration rate is reduced, and it is preferable that the through-hole 6 has a configuration in which one inlet and one outlet are provided and there is no branch flow path inside.

FIG. 12 is a cross-sectional view of a main part of a filter having a through-hole whose opening cross section is not uniform in the thickness direction. In the through hole 6 having such an open cross section, when the liquid enters from above,
When the flow is disturbed at the widened portion or the narrowed portion of the through hole 6, the velocity distribution is not uniform. Thereby, the through hole 6
A stagnation or a vortex of the flow is generated in the inside of the through hole, and it is difficult for the suspended matter to be taken out of the through hole 6 when the suspended matter is taken into the stagnation. Therefore, the regeneration rate is reduced, and the through-hole 6 preferably has a uniform opening cross section in the thickness direction.

FIG. 13 is a cross-sectional view of a main part showing an arrangement of a filter having a depression formed on the surface in addition to the through hole. Filter 1
Does not have the depression 7, the filtration passage is interrupted where there is no overlap between the through holes 6. On the other hand, filter 1
When the recess 7 is provided, a filtration passage formed by the overlap of the through hole 6 and the recess 7 or the overlap of the recesses 7 is formed, and the water flow resistance can be reduced.

FIG. 14 is a cross-sectional view of a main part showing an arrangement of a filter body in which through holes are opened in a direction perpendicular to the thickness direction of the filter body in the example of FIG. The through hole 8 is formed so as to have an opening axis that does not coincide with the thickness direction (the vertical direction in the figure) of the filter body 1, and is formed as an opening axis orthogonal to the thickness direction of the through hole 6 in the illustrated example. ing. If the filter 1 does not have the depression 7 or the through hole 8, the filtration passage is interrupted where there is no overlap between the through holes 6. On the other hand, in the filter body 1 provided with the depression 7 and the through hole 8, the through hole 8 is added as a flow path in addition to the filtration path formed by the overlap of the through hole 6 and the depression 7 or the overlap between the depressions 7.
Thereby, the water flow resistance can be reduced.

In the laminated filter 2 of the above embodiment, the filter 1 has two or more types of shapes, and the filter 1 is laminated so that the center position is matched between the adjacent filters 1. Both the surface 2-2 and the outer peripheral laminated surface 2-1 have irregularities on the surface derived from two or more different shapes of the filter body, and the irregularities increase the filtration area. Therefore, the filtration flow rate of the multilayer filter 2 increases,
Pressure loss can also be reduced.

[0030]

According to the present invention, a laminated filter having extremely high regeneration efficiency at low energy can be obtained, and a resource saving type laminated filter for fluid purification can be provided which 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, miniaturization with less pressure loss is possible, and its manufacture is facilitated.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a laminated filter according to an embodiment of the present invention.

FIG. 2 is an enlarged view showing a cross section of a portion surrounded by a circle A in FIG. 1, showing a flow of a liquid to be treated in a laminated filter.

FIG. 3 is a plan view of a filter having a rectangular saw blade-shaped inner and outer periphery incorporated in the multilayer filter of FIG. 1;

FIG. 4 is a plan view showing a filter body.

FIG. 5 is a plan view showing a filter.

FIG. 6 is a plan view showing a filter body.

FIG. 7 is a plan view showing a filter.

FIG. 8 is a plan view showing a filter.

9 is an enlarged view of a portion surrounded by a circle H in FIG. 2, and is a schematic diagram showing a mechanism of filtering a suspension contained in a liquid to be treated.

FIG. 10 is an enlarged view of a main part showing a procedure for regenerating a filter.

FIG. 11 is a cross-sectional view of a main part of a filter having a through hole having one inlet and two outlets.

FIG. 12 is a cross-sectional view of a main part of a filter body having a through hole whose opening cross section is not uniform in the thickness direction.

FIG. 13 is a cross-sectional view of a main part showing an arrangement of a filter body having a depression formed on the surface in addition to a through hole.

FIG. 14 is a cross-sectional view of a main part showing an arrangement of a filter body in which through holes are opened in a direction perpendicular to the thickness direction of the filter body in the example of FIG. 13;

[Explanation of symbols]

 1,1-1 Filter body 2 Multilayer filter 2-1 Outer layer stacking surface 2-2 Inner layer stacking surface 3-1 Upper surface pressing plate 3-2 Lower surface pressing plate 4 Pipe line 5-1,5-2 Notch 6,6 -1, 6-2 Through hole 7 Depression 8 Through hole C-1 Center point of filter

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shigeru Narakino 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F-term (reference) 4D019 AA03 BD01 CA03 CA05

Claims (1)

[Claims] A plurality of through-holes having a diameter larger than the particle diameter of the suspension, the plurality of through-holes being formed with the hole axis oriented in the thickness direction, and a notch formed at each of an inner peripheral end and an outer peripheral end. A multilayer filter in which a plurality of circular ring-shaped filter bodies are laminated, and an inflow portion of the liquid to be treated is provided on one side of an inner peripheral laminated surface and an outer peripheral laminated surface, and an outflow portion of the liquid to be treated is provided on the other side. The filter body has two or more types of non-circular ring shapes and is stacked so that the center positions thereof are coincident with each other, and the inner peripheral laminating surface and the outer peripheral laminating surface have the through hole in addition to the notch. A laminated filter that is partially exposed.