JP7629233B2 - filter - Google Patents

Description

The present invention relates to a filter.

For example, Patent Document 1 discloses a ceramic filter in which a plurality of filter units made of columnar porous ceramic sintered bodies having a honeycomb structure are combined and bound together via a sealing material layer, the assembly being composed of a combination of different types of filter units, and these different types of filter units carrying different amounts or types of catalysts. A ceramic filter in which a plurality of filter units made of columnar porous ceramic sintered bodies having a honeycomb structure are combined and bound together via a sealing material layer, the assembly being composed of a combination of different types of filter units, and these different types of filter units carrying different amounts or types of catalysts.

Patent Publication No. 2009-6326

The present invention aims to provide a filter with relatively low pressure loss.

The filter according to the present invention is a filter that captures substances to be collected in a fluid, and has a first flow path having a diameter that is not blocked by the substances to be collected, a second flow path having a diameter different from the first flow path and not blocked by the substances to be collected, and a partition wall separating the first flow path and the second flow path, all or part of the partition wall being made of a filter material that captures the substances to be collected. Here, "different diameters of the flow paths" is a concept that includes not only different diameters or average inner diameters, but also different cross-sectional shapes of the flow paths.

The filter according to the present invention is a filter that captures substances to be captured in a fluid, and has a flow path having a diameter that is not blocked by the substances to be captured, and a dividing wall that divides a portion of the flow path into a plurality of flow paths, and all or a portion of the dividing wall is made of a filter material that captures the substances to be captured.

Preferably, the average diameter of the first flow passage is 1.2 to 10 times that of the second flow passage.
Preferably, the first flow path has an average diameter of 0.01 mm to 10 m, and the second flow path has an average diameter of 0.02 mm to 100 m.

According to the present invention, a filter with relatively low pressure loss can be provided.

1 is a diagram illustrating an example of the overall configuration of an irregular honeycomb filter 10. FIG. FIG. 2 is a schematic diagram for explaining the irregular honeycomb filter 10 of FIG. 1 in more detail. FIG. 2 is a schematic diagram for explaining in more detail a partition wall 120 of the irregular honeycomb filter 10 of FIG. 1 . 1 is a diagram illustrating an evaluation experiment for evaluating the irregular honeycomb filter 10 of the present embodiment and the filters of Comparative Example 1 and Comparative Example 2. FIG. FIG. 13 is a diagram showing the results of an evaluation experiment.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram illustrating an example of the overall configuration of a deformed honeycomb filter 10. As shown in FIG.
As shown in Fig. 1, the irregular honeycomb filter 10 has a plurality of flow paths 100 having different inner diameters and partition walls 110 separating these flow paths. The irregular honeycomb filter 10 also has partition walls 120 that divide a portion of the flow path 100 into a plurality of flow paths. The irregular honeycomb filter 10 is an example of a filter according to the present invention.
Each of the flow paths 100 has an inner diameter large enough not to be clogged by the objects to be collected. For example, the average inner diameter of the first flow path 100B is 1.2 to 10 times the average inner diameter of the second flow path 100A. More specifically, the average inner diameter of the flow path 100 is 0.3 mm to 100 mm, and the average inner diameter of the first flow path 100B is 1.2 to 5 times the average inner diameter of the second flow path 100A. Here, the inner diameter of the flow path 100 refers to the diameter when the flow path cross section is circular, the minimum diameter when the flow path cross section is elliptical, and the minimum distance from any face to the opposing face or apex when the flow path cross section is polygonal.
Since the first flow path 100B is wider than the second flow path 100A, the internal pressure is relatively high. Due to this internal pressure difference, the fluid flows from the first flow path 100B to the second flow path 100A, and the objects to be collected in the fluid are collected by the partition wall 110.

FIG. 2 is a schematic diagram for explaining the irregular honeycomb filter 10 of FIG. 1 in more detail.
As shown in Fig. 2, a part or the whole of the partition wall 110 is made of a filter material that collects the target material. In this example, the whole of the partition wall 110 is made of a filter material. The partition wall 110 is made of, for example, activated carbon, diatomaceous earth, low-grade carbon, cellulose or other fibrous material, silicon carbide, cordierite, ceramic, or a mixture of these. The partition wall 110 may be supported with a functional additive such as titanium oxide.
The partition wall 110 may be formed by a slurry method or by extrusion molding. When a low resistance filter material is desired, the slurry method is advantageous.

FIG. 3 is a schematic diagram for explaining in more detail the dividing wall 120 of the irregular honeycomb filter 10 of FIG.
3, a part of the flow passage 100B is divided by a partition wall 120. That is, the partition wall 120 allows the inner diameter of the flow passage 100 to be varied, and the paths of the fluid flowing inside the irregular honeycomb filter 10 can be diversified.

FIG. 4 is a diagram for explaining an evaluation experiment for evaluating the irregular honeycomb filter 10 of the present embodiment and the filters of Comparative Example 1 and Comparative Example 2. As shown in FIG.
As shown in Fig. 4(A), the filters to be evaluated are the filter of this embodiment, a filter (Comparative Example 1) having a plurality of straight flow paths with the same inner diameter, and a filter (Comparative Example 2) having a honeycomb structure in which adjacent air holes are alternately closed. The filter of Comparative Example 2 is the filter described in Patent Document 1, etc. The materials, cross-sectional areas, and lengths of these filters are the same.
As shown in Figure 4 (B), inlet and outlet pressure loss measurement ports were installed before and after the filter unit, and the pressure loss ΔP was measured. The collection efficiency was measured by passing aerated Kanto loam (JIS type 11) through it, and measurements were taken at sampling points before and after the filter unit using the filter weight method. The test conditions were a flow rate of 100 L/min and a dust load of the Kanto loam of 5 to 8 g/min. A HEPA filter was used as the filter for measuring collection efficiency. An electronic differential pressure gauge was used for pressure measurement. A diaphragm pump was used as the suction pump, and flow rate adjustment was performed with a valve. Both pressure measurement and collection efficiency were measured every 5 mg/ ^m2 or 10 mg/ ^m2 .

FIG. 5 is a diagram showing the results of the evaluation experiment.
As shown in FIG. 5(A), the initial collection efficiency is similar between this embodiment and Comparative Example 1. However, after dust loading, the collection efficiency of Comparative Example 1 drops sharply, whereas the collection efficiency of this embodiment drops more gradually than that of Comparative Example 1.
5B, the pressure loss of Comparative Example 2 is overwhelmingly higher than that of this Example and Comparative Example 1 from the beginning, and the difference increases as the dust load increases. On the other hand, the pressure loss of this Example and Comparative Example 1 is overwhelmingly lower than that of Comparative Example 2, and the fluctuation is small.
In other words, the filter of this embodiment can collect dust at a lower pressure and is expected to have a longer life. For example, sufficient dust collection performance can be expected by simply attaching the filter of this embodiment to a commercially available circulator or air purifier.

As described above, the irregular honeycomb filter 10 of this embodiment can collect dust stably over a long period of time with low pressure loss.

Although an embodiment of the present invention has been described, the above embodiment is presented as an example and is not intended to limit the scope of the invention. The above embodiment can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the gist of the invention. The above embodiment and its variations are within the scope of the invention and its equivalents as set forth in the claims, as well as within the scope and gist of the invention.

Reference Signs List 10: Deformed honeycomb filter 100: Flow passage 110: Partition wall 120: Partition wall

Claims (3)

A filter for collecting objects to be collected in a fluid, comprising:
a first flow path having a diameter large enough not to be clogged by the object to be collected;
a second flow path having a diameter different from that of the first flow path and not clogged by the objects to be collected;
a partition wall separating the first flow path and the second flow path;
a dividing wall dividing a portion of the first flow path into a plurality of flow paths;
having
The partition wall is entirely or partially made of a filter material that collects the objects to be collected,
Both ends of the first flow path and the second flow path are open,
The filter, wherein the diameter of the first flow passage is larger than the diameter of the second flow passage over the entire flow passage excluding the portion . The average diameter of the first flow path is 1.2 to 10 times that of the second flow path.
The filter of claim 1 . The average diameter of the second flow path is 0.01 mm to 10 m;
The filter according to claim 2 , wherein the first flow passage has an average diameter of 0.02 mm to 100 mm.

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