JP2580846Y2 - Separable in-cell filter - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-cell filter for use in nuclear energy facilities for removing radioactive materials, and more particularly to a separable in-cell filter that can be reduced in volume and can be reused.

[0002]

2. Description of the Related Art In an in-cell filter, the upper and lower ends of a filter body containing a filter medium between a cylindrical inner core and a cylindrical outer core are sealed with an upper lid and a lower lid, respectively. Therefore, the entire end of the filter body is directly fixed to the upper and lower lids via an adhesive.

[0003]

For example, an in-cell filter is used for removing radioactive materials in a nuclear power plant or the like. When discarding an in-cell filter containing radioactive materials, it is necessary to separate and reduce the volume. Is desired. However, in the case of the conventional in-cell filter, since the filter body and the upper and lower lids are directly fixed via an adhesive, they cannot be separated. Therefore, there has been a demand for a proposal of an in-cell filter in which the filter main body and the upper and lower lids can be freely separated while maintaining the sealing property between the filter main body and the upper and lower lids.

The separable in-cell filter according to the present invention satisfies the above-mentioned demands. The upper and lower ends of a filter body containing a filter medium between a cylindrical inner core and a cylindrical outer core are sealed with an upper lid and a lower lid, respectively. In the in-cell filter, a buffer material made of glass wool or filter paper is interposed between the upper and lower lids and the filter body, and only both ends of the filter material of the filter body are fixed to the buffer material with an adhesive. The lid is pressed and fixed to the filter body.

It is preferable that the upper and lower lids are pressed and fixed to the filter body by tightening bolts for connecting the lids, because the assembling work of the in-cell filter is simplified.

In order to prevent the adhesive from penetrating into the cushioning material and from adhering to the upper and lower lids,
It is preferable to use a paste-like or high-viscosity silicone having a viscosity of 10 poise or more, a urethane resin, an epoxy resin, a chloroprene-based synthetic rubber, or the like, which has poor affinity for a buffer material.

[0007]

The filter body is fixed only to the buffer material made of glass wool or filter paper with an adhesive. The buffer material to which the filter body is fixed is not fixed to the upper and lower lids. The upper and lower lids are separable, so that the volume can be reduced and the core and the upper and lower lids can be reused. In addition, the seal between the filter main body and the upper and lower lids is maintained by compressing the sealing portion formed of a buffer material made of glass wool or filter paper and an adhesive by pressing the upper and lower lids against the filter main body.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exploded perspective view showing an embodiment of a separable in-cell filter according to the present invention; In the drawing, reference numeral 1 denotes a filter main body, in which a filter medium 4 made of glass paper is accommodated between a cylindrical inner core 2 made of punched metal and a cylindrical outer core 3 also made of punched metal. The upper lid 5 and the lower lid 6 were sealed. In the illustrated embodiment, the bolt 7 fixed to the lower lid 6 is used.
The upper lid 5 and the lower lid 6 are connected via
The upper and lower lids 5 and 6 were tightened and fixed to the filter body 1 by pressing. In the figure, 9 is an upper cover holding plate, 1
0 indicates a gasket.

The upper lid 5 and the lower lid 6 are shown in detail in the state of attachment of the lower lid in FIG. 3. At the same time, only the end 4a of the filter medium 4 of the filter body 1 is fixed to the cushioning material 11 via an adhesive 12 made of high-viscosity silicone.

As Comparative Example 1, as shown in FIG.
The upper cover 5 and the lower cover 6 are attached to the filter body 1 with the adhesive 1 applied to the entire surface between the upper and lower covers 5 and 6 and the filter body 1.
An in-cell filter sealed with only 2 was prepared.

As a comparative example 2, as shown in FIG. 5, an upper cover 5 and a lower cover 6 are attached to the filter body 1 such that glass wool or glass wool which is applied to the entire surface between the upper and lower covers 5, 6 and the filter body 1 An in-cell filter was made by sealing only with the buffer material 11 made of filter paper.

Further, as a comparative example 3, as shown in FIG. 6, the upper cover 5 and the lower cover 6 are attached to the filter body 1 and the entire surface between the upper and lower covers 5, 6 and the filter body 1 is made of glass wool or filter paper. With the cushioning material 11
An in-cell filter in which the entire end of the filter main body 1 was fixed to the buffer material 11 via an adhesive 12 to seal and seal the filter body 1 was produced.

Next, with respect to the in-cell filters of the above embodiment and Comparative Examples 1 to 3, the collection efficiency, separation property and reusability were measured or evaluated.

[0014]

[Table 1]

The reusability was determined to be good if no adhesive was attached to the core or the upper and lower lids. As shown in Table 1, in the case of Comparative Example 1, the trapping efficiency was 99.97% or more, which was good, but lacked in separability and reusability, and in the case of Comparative Example 2, the separability was poor. , The reusability is good, but the collection efficiency is less than 99.97%, which is not sufficient and poor;
In the case of Comparative Example 3, the collection efficiency was 99.97% or more, which was good, but lacked in separability and reusability. As is clear from Table 1, only the in-cell filter of this example is excellent in all of the collection efficiency, the separation property, and the reusability.

[0016]

As described above, according to the in-cell filter of the present invention, the sealing performance between the filter body and the upper and lower lids is excellent, the collection efficiency is good, and the volume can be reduced by being separable. An in-cell filter capable of reusing the core and the upper and lower lids can be provided.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of an embodiment of a detachable in-cell filter of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged sectional view of a main part of a filter body and a sealing portion of a lower lid of the detachable in-cell filter of FIG. 1;

FIG. 4 is an enlarged cross-sectional view of a main part of a filter body and a seal portion of a lower lid of an in-cell filter according to a comparative example, which corresponds to FIG. 1;

5 is an enlarged cross-sectional view of a main part of a filter body and a seal portion of a lower lid of an in-cell filter according to another comparative example, corresponding to FIG. 1;

6 is an enlarged cross-sectional view of a main part of a filter body and a seal portion of a lower lid of an in-cell filter according to still another comparative example, which corresponds to FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filter main body 2 Inner core 3 Outer core 4 Filter medium 4a Filter medium end part 5 Upper lid 6 Lower lid 7 Bolt 8 Nut 9 Upper lid holding plate 10 Gasket 11 Buffer material 12 Adhesive

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hideaki Kawaguchi 415, Sakunotani, Yuki-shi, Ibaraki Pref. Japan Inorganic Co., Ltd. Yuki Plant (56) Reference Reference −79627 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) B01D 46/00-46/52

Claims (2)

(57) [Scope of request for utility model registration] 1. An in-cell filter in which a filter body containing a filter medium between a cylindrical inner core and a cylindrical outer core has upper and lower ends sealed with an upper lid and a lower lid, respectively. And a buffer material made of glass wool or filter paper is interposed in the filter body, only both ends of the filter material of the filter body are fixed to the buffer material with an adhesive, and the upper and lower lids are pressed and fixed to the filter body. Flexible in-cell filter. 2. The apparatus according to claim 1, wherein said upper and lower lids are tightened by bolts connecting said lids.
A separable in-cell filter as described in the above.