JP3348812B2 - Structure of gas removal filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure of a gas removing filter.

[0002]

2. Description of the Related Art In a filter for removing fine particles, fibers or the like as a raw material are not uniform, so that the filter is clogged from a place having a large void. When the pressure loss at the clogged location increases, the fluid moves to another location, etc., and even if there is a drift, it has self-controllability and distributes the fine particles evenly and evenly in a macroscopically uniform flow. Looks like.

[0003] On the other hand, in the gas removal filter, in the above-mentioned macroscopic uniform flow, the gas adsorbed component of the filter becomes temporarily full, and a phenomenon of deterioration appears, and the life of the gas removal filter is reduced. Is shorter than expected.

Therefore, there is a possibility that the conventional pleated structure of the filter for removing fine particles cannot exhibit sufficient performance.

FIG. 4 shows one unit surrounded by a chain line of a gas removing filter 50 obtained by laminating and pleating a plurality of filters, and FIG. The flow velocity distribution at the inlet 52 is shown, although modeled as follows. That is, the flow is concentrated on the inlet portion of the filter 50, that is, on the corner portion 51. Therefore, it can be understood that the gas comes into contact with the corner portion 51 and the gas adsorption component is deteriorated.

[0006] As shown in FIG. 6, the flow velocity is highest at the outlet 53. That is, there is a large difference between a place where air is easily passed and a place where air is not easily passed. As a result, variations occur in the residual ion exchange capacity of each part on the outlet side of the filter 50. This is because the air passing through the filter 50 contacts the filter 50 and increases the apparent thickness of the film.

[0007]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a gas for preventing the corners of the pleats on the inlet side from deteriorating first and eliminating the variation in the residual ion exchange capacity at the corners on the outlet side pleats. An object of the present invention is to provide a structure of a removing filter.

[0008]

According to the gas removing filter structure of the present invention, an inlet separator is provided between inlet pleats of a filter unit formed by laminating and pleating a plurality of non-woven fabrics of ion exchange fibers. , The outlet side separator is inserted between the outlet side pleats, and a spacer is provided to cover the corner of the inlet side pleats.

Further, according to the structure of the gas removing filter of the present invention, the inlet separator is inserted between the inlet pleats of the filter unit formed by laminating and pleating a plurality of non-woven fabrics of ion exchange fibers. Inserting the outlet separator between the outlet pleats, heat-sealing the corners of the inlet and outlet pleats, crushing the gap of the nonwoven fabric, and sharpening the tip so that gas does not permeate from the tip. It has become.

Further, according to the structure of the gas removing filter of the present invention, an inlet separator is inserted between an inlet pleat of a filter unit formed by stacking and pleating a plurality of filters, and an outlet pleat is formed. An outlet-side separator is inserted therebetween, and a spacer that covers a corner of the inlet-side pleat is provided. The outlet-side separator is formed of a porous plate.

According to the structure of the gas removing filter of the present invention, the inlet-side separator is inserted between the inlet-side pleats of the filter unit formed by laminating and pleating a plurality of filters. An outlet-side separator is inserted therebetween, and a spacer that covers a corner of the inlet-side pleat is provided, and the spacer is formed of a porous plate.

Further, according to the present invention, the spacer is a porous plate. Further, according to the present invention, the inlet-side and outlet-side separators are porous plates.

[0013]

In the gas removing filter configured as described above, the corners of the pleat fold inlet are heat-sealed to form an acute angle, so that air does not pass through this end, so that ion exchange is prevented. No effect occurs.

Further, at the pleat outlet side, turbulence is generated in the air flow by the outlet side separator of the porous plate body, the boundary film between the filter and the separator is eliminated, and uniform gas contact is performed. Variations in the residual ion exchange capacity at each part of the outlet are eliminated.

[0016]

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

In FIG. 1, the gas removing filter of the present invention comprises a lower outer frame 1, an upper outer frame 2, a left outer frame 3, and a right outer frame 4.
A filter unit 10 housed in the space defined by
Pleat A on the inlet side of the filter unit 10 (FIG. 2)
The separator 12 inserted between the inlet side separator 20, the outlet side separator 30 inserted between the outlet side pleats B (FIG. 2), and the corner 12 of the inlet side pleat A of the filter unit 10.
(FIG. 2).

As shown in FIG. 2, the filter unit 10 is formed by laminating a plurality of (four in the illustrated example) ion-exchange fiber non-woven fabrics 11a to 11d and pleating the non-woven fabrics. Are connected at the corners 12 and 13, and the corners 12 and 13 are heat-sealed to crush the gap of the non-woven fabric and make the tip T an acute angle and the inlet side pleats A and the outlet side. Pleat B is formed. When treating ammonia or acidic gas, the nonwoven fabric that adsorbs ammonia or acidic gas is a nonwoven fabric other than the first nonwoven fabric.
Used for 1b and 11c.

The inlet side separator 20 is formed by forming a large number of small holes 33 formed by bending a thin plate 21 into a corrugated shape in a direction perpendicular to the flow S with a porous plate. It is in contact with the side wall of the side pleats A.

The outlet-side separator 30 is formed by bending a thin plate 31 into a corrugated shape in a direction perpendicular to the flow S and forming a large number of small holes 33 in the same manner as the separator 20 by a porous plate. Each top edge 32 is in contact with the side wall of the outlet side pleat B.

Next, the operation will be described.

At the time of gas removal, the corner portion 12 of the inlet side pleat A has a structure in which gas is not permeated from the front end portion by heat-sealing to crush the gap of the nonwoven fabric and to make the front end T an acute angle. It is avoided that the part 12 deteriorates first. It is preferable that the depth of the heat-sealed portion in the direction of the flow S from the tip T is 10% or less and 0.5% or more. When the heat-sealed portion is 10% or more, the effective portion of the filter is reduced, and the effect of crushing the tip is lost.
At 0.5% or less, there is no point in providing the heat-sealed portion at the tip.

Further, since the outlet side pleats B are inserted into the outlet side separator 30 of punched metal, a turbulent flow occurs in the flow of air, and the boundary between the filter unit 10 and the separator 30 is eliminated, and the uniformity is maintained. Gas contact is performed, and there is no variation in the residual ion exchange capacity of the outlet-side pleat B. Unless the inlet side and the outlet side are heat-sealed to make the tip sharp, the ion exchange cannot be effectively used.

FIG. 3 shows another embodiment of the present invention, in which the outlet side separator 30A is constituted by a wire mesh 34 whose side, which is a porous plate, is in contact with the side wall of the outlet side pleats B.
This is an example configured in the same manner as described above. This embodiment also has the same operation and effect as the previous embodiment.

[0025]

According to the present invention, as described above, the corners of the pleats on the inlet side are prevented from being deteriorated first, and the variation of the residual ion exchange capacity of each part of the pleats on the outlet side is eliminated. Therefore, the life of the filter can be extended.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a horizontal sectional view showing a filter unit and a spacer.

FIG. 3 is an exploded perspective view showing another embodiment of the present invention.

FIG. 4 is a drawing showing a model of a conventional filter.

FIG. 5 is a flow velocity distribution diagram near a corner of an inlet-side pleat.

FIG. 6 is a flow velocity distribution chart near a corner of an outlet-side pleat.

[Explanation of symbols]

 A: Inlet pleat B: Outlet pleat S: Air flow 1 ... Lower outer frame 2 ... Upper outer frame 3 ... Left outer frame 4 ... Right outer frame 10 ··· Filter units 11a to 11d ··· Nonwoven fabrics 12, 13, 51 ··· Corner portions 14, 15, 16 ··· Side portions 20 ··· Inlet side separators 21 and 31 ··· Thin plates 22, 32 · ..Top edge 30 ... Outlet side separator 33 ... Small hole

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-227249 (JP, A) JP-A-63-205115 (JP, A) JP-A-59-4142 (JP, A) (58) Field (Int. Cl. ⁷ , DB name) B01D 46/00-46/54 B01D 53/34

Claims (5)

(57) [Claims] 1. An inlet separator is inserted between inlet pleats of a filter unit formed by laminating and pleating a plurality of non-woven fabrics of ion exchange fibers, and an outlet separator is inserted between outlet pleats. And a spacer for covering a corner portion of the inlet-side pleats. 2. An inlet separator is inserted between inlet pleats of a filter unit formed by laminating and pleating a plurality of non-woven fabrics of ion exchange fibers, and an outlet separator is inserted between outlet pleats. A gas removing filter structure wherein the inlet and outlet pleats are heat-sealed at their corners to crush gaps in the nonwoven fabric and sharpen the tip so that gas does not pass through the tip. 3. An inlet separator is inserted between inlet pleats of a filter unit formed by laminating and pleating a plurality of filters, and an outlet separator is inserted between outlet pleats. A spacer for covering a corner of a side pleat, wherein the outlet-side separator is a porous plate. 4. An inlet separator is inserted between inlet pleats of a filter unit formed by laminating and pleating a plurality of filters, and an outlet separator is inserted between outlet pleats. A structure of a gas removal filter, wherein a spacer is provided to cover a corner of the side pleat, and the spacer is a porous plate. 5. The structure of a gas removing filter according to claim 2, wherein a heat-sealed portion at a corner of the pleat is not more than 10% and not less than 0.5% of a depth of the filter.