JP2016112520A - Multilayer structure filter and filter device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multilayer structure filter required that a layer member at an upstream side does not cause clogging from an initial stage.SOLUTION: A problem is solved by a filter where: an external layer and at least one or more filter layers disposed at the inside of the external layer are provided; coarse particles and aggregates are filtered by passing a liquid toward one or more the filter layers from the outside of the external layer; and the external layer has a first porous member and a second porous member and is wound around at least one or more the filter layers in a state of overlapping the first porous member and the second porous member.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a filter for passing a liquid having a high solid content ratio and filtering coarse particles and aggregates contained in the liquid.

  For example, in a product using a high solid content particle-containing fluid such that the viscosity of the fluid is approximately 10 centipoise or more and the fluid viscosity is 500 centipoise or more, the presence of coarse particles and secondary aggregates degrades the product quality. Classification filtration is required for the purpose of removing coarse particles and aggregates. In general, a filter that filters a fluid efficiently removes coarse particles and aggregates contained in the fluid to be filtered. Therefore, the average size of the pores of the members that constitute the filter is removed in the fluid to be filtered. It is determined by the particle size of coarse particles and aggregates to be obtained and the particle size of particles that are necessary without being removed. If the average size of the pores of the members constituting the filter is too large relative to the average particle size of the coarse particles and aggregates contained in the fluid, the coarse particles and aggregates cannot be removed. On the other hand, if the average size of the pores of the members constituting the filter is too small with respect to the particle size of the particles contained in the fluid, coarse particles and aggregates initially removed by the filter may be The flow cannot be filtered.

  The fluid to be filtered contains a plurality of coarse particles and aggregates having different average particle diameters and necessary particles. In order to efficiently remove these coarse particles and aggregates, a multilayer structure filter using a plurality of types of layer members is used.

  FIG. 1 shows a filtration device 20 using a filter 1 composed of two layer members as a representative example of a multilayer filter. A filter 1 having a multilayer structure is disposed in the filtration device 20. The filter 1 includes an inner layer 2 and an outer layer 3 having a different structure on the outer side thereof. Mainly, the inner layer 2 functions as a filtration layer, and the outer layer functions as a rectifying layer. The fluid filtering device 20 includes an upstream line 21 through which a fluid to be filtered flows, and a downstream line 22 through which the filtered fluid flows. The fluid from the upstream line 21 to the downstream line 22 typically flows in the filter from the space outside the filter 1 toward the center of the filter 1 as indicated by the arrow, and the filtered fluid is It is discharged from the central space of the filter to the downstream line 22. In the filter 1 having such a multilayer structure, generally, a layer member having a small pore diameter is disposed on the inside as a filtration layer, and a layer member having a relatively large pore diameter is disposed on the outside as a rectifying layer, so that coarse particles and aggregates can be removed. Remove small particles and agglomerates in order. For example, in the filter 1 of FIG. 1, the hole diameter of the inner layer 2 is set smaller than the hole diameter of the outer layer 3.

  When a general filter is used to pass a liquid with a high solid content ratio and filter coarse particles and aggregates, the particle size of the coarse particles and aggregates contained in the fluid and the required particle size When determining the pores based on the diameter, if the filter structure is such that coarse particles and aggregates are removed by the pores on the upstream side of the filter, the layer member located on the upstream side will suddenly Clogging may occur and the filter as a whole may not function sufficiently. For this reason, the outer layer needs to be configured to promote a rectifying action for preventing clogging so as not to hinder the downstream flow.

  Therefore, it comprises an outer layer and at least one or more filtration layers arranged inside the outer layer, and allows liquid to flow from the outside of the outer layer toward the one or more filtration layers to remove coarse particles and aggregates. A filter for filtering, wherein the outer layer includes a first porous member and a second porous member, and the at least one or more of the first porous member and the second porous member are stacked. The problem is solved by a filter wound around the filter layer.

  Thereby, the multilayer structure filter which does not raise | generate a sudden clogging in a rectification | straightening layer from the liquid flow initial stage can be provided.

The filtration apparatus using a multilayer structure filter is shown. 1 shows a multilayer filter of the present invention. 3 shows the outer layer of the multilayer filter of the present invention. 3 shows another embodiment of the multilayer filter of the present invention.

  Hereinafter, the filter and the filtration device of the present invention will be described with reference to FIGS. FIG. 2 shows the filter 1 according to the embodiment of the present invention. The filter 1 includes a filtration layer 2 as an inner layer and a rectifying layer 3 as an outer layer. Here, this does not mean that the filtration layer 2 has no rectifying effect. Further, this does not mean that the rectifying layer 3 also has no filtration function. Mainly, the filter layer 2 is set to have a filtering effect, and the rectifying layer 3 means a layer set to have a rectifying effect. Moreover, the filtration layer 2 consists of at least one or more layer members. As the filtration layer 2, it consists of filtration layer members, such as a nonwoven fabric, for example. The filtration layer 2 may be constituted by a single filtration layer member, or a plurality of filtration layer members such as a plurality of filtration layer members of the same type having different average pore diameters or a plurality of filtration layer members of different types. May be. The rectifying layer 3 is disposed outside the filtration layer 2 by stacking one or more porous members.

  FIG. 3 is a diagram showing details of the rectifying layer 3. FIG. 3 is a view of portion A of FIG. 2 as viewed from the direction of the arrow. The rectifying layer 3 is made of a plurality of porous members. For example, as shown in FIG. 3, the rectifying layer 3 can be configured as a combination layer 5 configured by stacking a first porous member 11 and a second porous member 12.

  In the combination layer 5, the first porous member 11 and the second porous member 12 can generally be different types of members. Different types of members may be various combinations such as members having the same average pore diameter and members having different materials, even if the materials are the same. Of the first porous member 11 and the second porous member 12, the first porous member 11 is wound more inside the filter than the second porous member 12. Further, the size of the hole of the first porous member 11 is preferably larger than the size of the hole of the second porous member 12.

  In the above description, the rectifying layer 3 has been described in the embodiment in which one combination layer 5 configured in a state where two different porous members are stacked is wound around the filtration layer 2. However, a plurality of combination layers may be further stacked on the combination layer configured in a state where two different porous members are stacked, and may be wound around the filtration layer 2. That is, “one porous member” prepared separately and “another porous member” arranged inside the “one porous member” separately from the “one porous member” are prepared. One or more stacked combination layers 6 and 7 are further manufactured. The one or more combination layers 6 and 7 are further overlapped with the combination layers 6 and 7 formed by overlapping the first porous member 11 disposed inside the second porous member 12 and around the filtration layer 2. Wrap around.

  That is, as shown in FIG. 4, the third porous member 13 is prepared as the “one porous member”, and the fourth porous member 14 is prepared as the “other porous member”. The third porous member 13 is disposed inside the fourth porous member 14 to form the combination layer 6. At this time, the size of the hole of the third porous member 13 is preferably larger than that of the fourth porous member 14. This can be superimposed on the combination layer 5 and wound around the filtration layer 2 to form the rectifying layer 3. Furthermore, a fifth porous member 15 and a sixth porous member 16 are prepared, and the fifth porous member 15 is arranged on the inner side of the sixth porous member 16 to form the combination layer 7. At this time, the size of the hole of the fifth porous member 15 is preferably larger than the hole of the sixth porous member 16. It is possible to overlap the combination layer 5 and the combination layer 6 and wind the combination layer 5 to the combination layer 7 around the filtration layer 2 as the rectifying layer 3. In this way, a pair of combination layers may be formed by two porous members, and the rectifying layer 3 may be configured as a plurality of combination layers obtained by combining a plurality of combination layers.

  Further, as shown in FIG. 3, the first porous member 11 and the second porous member 12 have holes formed between fiber axes formed in two directions having an angle with each other. That is, the first porous member 11 forms a hole between the fiber axis along the first direction and the fiber axis along the second direction that is an angle with respect to the first direction. doing. The second porous member 12 forms a hole between the fiber axis along the third direction and the fiber axis along the fourth direction, which is an angle with respect to the third direction. ing. When the first porous member 11 and the second porous member 12 are overlapped when the rectifying layer 3 is formed, the first porous member 11 and the second porous member 12 have a first direction, a second direction, a third direction, and a fourth direction. Of these, it is preferable that at least one does not match. For example, the first direction and the second direction of the first porous member 11 are orthogonal to each other, and the holes can be rectangular. On the other hand, the third direction and the fourth direction of the second porous member 12 are not orthogonal to each other, and the holes can be parallelograms or rhombuses. At this time, the first direction of the first porous member 11 and the third direction of the second porous member 12 can be matched. In this case, the second direction and the fourth direction do not match. As shown in FIG. 3, all of the first direction, the second direction, the third direction, and the fourth direction may not be matched.

  The first porous member 11 may serve as a spacer with respect to the second porous member 12. Therefore, the thickness of the first porous member 11 and the second porous member 12 can be different. The thickness can be set for each fluid.

  If the rectifying layer 3 is configured as a single filter member (for example, the first porous member 11) and is wound around the inner member, it is wound over 360 degrees with respect to the central angle of the filtration layer 2, When the single filter members constituting the rectifying layer 3 are overlapped, the overlapped outer portion is distant from the center of the filter. As a result, the holes are displaced in the adjacent layers. Due to the positional deviation, an effective channel cross-sectional area through which the fluid formed by the holes in the thickness direction in the rectifying layer 3 passes is reduced. As a result, necessary particles are also captured in the rectifying layer 3. Necessary particles trapped by the rectifying layer 3 block the pores and obstruct the flow to the filtration layer 2. However, if the rectifying layer 3 is composed of at least two layers of porous members as in the present invention, the size of the holes can be changed in the adjacent layers. It is possible to prevent a decrease in the effective channel cross-sectional area from the effect that the flow in the circumferential direction of the filter can be stimulated by changing the thickness of adjacent layers. .

  Here, the effect of the present invention will be described by showing test results with a comparative example. As a comparative example, a filter having a filtration layer having a performance of removing particles of 50 micrometers or more from a fluid by 90% or more from a fluid and having no rectifying layer was prepared. On the other hand, as an example, a filter wound around the outer periphery of the filtration layer was prepared in a state where the porous member A and the porous member B were stacked as a rectifying layer on the outer periphery of the same filtration layer member.

  The porous member A forms a hole between a fiber axis along a certain direction (first direction) and a fiber axis along a second direction that is at an angle with respect to that direction (first direction). doing. Further, the porous member B has a hole between a fiber axis along a certain direction (third direction) and a fiber axis along a fourth direction having an angle with respect to the direction (third direction). Is forming. Then, as the rectifying layer, the porous member A and the porous member B are overlapped with each other so that the first direction, the second direction, the third direction, and the fourth direction do not match, and this is wound around the outer periphery of the filtration layer. Formed.

  Here, for each of the filter of the comparative example and the filter of the example of the present invention, the pressure loss was measured by flowing a test fluid having a particle concentration of 60 weight percent with the outer layer side as the upstream. As a result, as shown in Table 1, in the comparative example having no rectifying layer, the back pressure necessary for liquid passage increased to 100 kilopascals or more, but in the filter of the present invention, the back pressure necessary for liquid passage was 40. Reduced to kilopascals.

1 Filter 2 Filtration layer (inner layer)
3 Rectification layer (outer layer)
11 First porous member 12 Second porous member

Claims (3)

An outer layer and at least one or more filtration layers disposed inside the outer layer, allowing liquid to flow from the outside of the outer layer toward the one or more filtration layers to filter coarse particles and aggregates. A filter,
The outer layer includes a first porous member and a second porous member, and is wound around the at least one filtration layer in a state where the first porous member and the second porous member are overlapped. The attached filter. The filter according to claim 1,
The first porous member forms a hole between the fiber axis along the first direction and the fiber axis along the second direction at an angle with respect to the first direction;
The second porous member forms a hole between the fiber axis along the third direction and the fiber axis along the fourth direction of the direction at an angle with respect to the third direction,
A filter in which the first direction, the second direction, the third direction, and the fourth direction do not match in the state where the first porous member and the second porous member are overlapped. The filter according to claim 1 or 2,
The filtration layer is arranged in the overlapped state with one porous member and one or more porous members arranged inside the one porous member and another porous member having a larger hole than the one porous member. A filter wound around the at least one filtration layer in a state in which the combination layer is further stacked.

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