JPH08257342A - Gas adsorptive air filter - Google Patents

Abstract

PURPOSE: To uniformize the adsorption life of respective capsules of sheet capsules and provide a gas adsorptive air filter of stabilized adsorption performance by making the amount of a gas adsorbent on the air inlet side to be filled in respective capsules of the sheet capsules more than that of the air outlet side. CONSTITUTION: A filter medium 1 is provided with a parallel filter medium sections 1a folded into zigzag shape. Sheet capsules 3a and 3b provided with a plurality or independent capsules 2a, 2b and 2c are fitted between respective parallel filter medium sections 1a. A gas adsorbent 4 is filled in respective capsules 2a, 2b and 2c. In the sheet capsule 3a fitted in a space between the parallel filter medium sections 1a with air inlets 6a opened on the air upstream side A of a filter, the amount of the gas adsorbent 4 in the capsule 2a close to the air inlet 6a is more. Thus the adsorption life of respective capsules of the sheet capsules is uniformized, and the stabilized adsorption performance of high reliability can be demonstrated at all times.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air filter having a zigzag fold structure used in an air conditioning system, and more specifically, it has a good dust (dust and smoke fine particles) filtering performance and a gas adsorption function. The present invention relates to a gas adsorption air filter having the same.

[0002]

2. Description of the Related Art Conventionally, in air-conditioning equipment, a device for cleaning the air to adjust the temperature and humidity has been used.
Among them, an air filter is used as an air purifying device for removing dust, and is used for coarse dust to fine dust depending on the application.
PA and HEPA filters are applied. A medium-performance or high-performance filter is generally used for filtering the air supplied to the room in the air conditioning of a normal commercial or office building.

Such a medium / high performance filter is generally shown in FIG.
The structure is shown in cross section in FIG. That is, in this example, the filter medium 811 is formed in a zigzag fold of parallel rows that form a continuous U-shaped cross section in the frame 810 that is assembled in a square shape, and at the inner circumference of the air inlet side 812 of the frame 810. A seal 813 is applied to a portion that comes into contact with the filter medium 811 with a glass mat and a special resin (for example, urethane resin) to maintain airtightness. Furthermore, aluminum foil or kraft paper is formed into a corrugated shape so as to maintain the distance between the adjacent filter medium surfaces and prevent air resistance as much as possible, that is, in this example, a triangular shape forming a continuous V-shaped cross section. A separator 814 formed in a zigzag folded shape of a folded column is inserted. The separator 814 has an air passage formed along the corrugated groove in the inlet side filter medium folding space 830 opening to the air upstream side 812 and the outlet side filter medium folding space 831 opening to the air downstream side 825 of the filter. Is similarly arranged.

On the other hand, NO _x , SO _x , CO for air cleaning
It is also necessary to remove harmful gases such as _X and offensive / unpleasant odors. Therefore, as a method of gas adsorption and dust collection, generally, a coarse dust filter for pretreatment is first provided, and then activated carbon, zeolite, highly active calcium, or a chemical is attached to them. There is used a means for arranging a tank or a frame filled with the adsorbent, allowing air to flow through the tank or frame, and further installing the above-mentioned medium / high performance air filter for dust removal behind the tank or frame.

Further, an air cleaning mechanism for carrying out gas adsorption and dust collection together has also been implemented. Activated carbon having a gas adsorption function is formed into a fiber to form an air filter, and gas adsorption and dust collection are carried out. Something that is designed to be done at the same time is being developed.

[0006] As described above, the air cleaning process is ideally performed for both pollutant gas and dust. However, even with ULPA filters, the particle size is 0.1
It is not applicable to gas components below μm. Therefore, the above-mentioned former method that uses both the gas adsorption mechanism and the dust collection mechanism is applied, but such a method can sufficiently secure the gas adsorption performance and the dust filtration performance. The gas adsorbing device becomes large in size as compared with the amount of air to be processed, and it is suitable for plants, but not suitable for general building air conditioning.

On the other hand, the above-mentioned means for constructing the air filter itself with activated carbon fibers has a common processing mechanism for gas and dust, and therefore has a limited processing capacity in a limited installation space. Moreover, there is no function of selectively treating a specific target gas.

In view of the above points, the present applicant has proposed and applied for a compact air filter capable of efficiently adsorbing gas and collecting dust (Japanese Patent Application No. 6-199).
426). A gas adsorption air filter according to this prior application includes a zigzag-folded filter medium having parallel folded parallel portions;
A sheet capsule in which a plurality of capsules that independently swell in a vertical and horizontal direction in an appropriate arrangement are formed on a sheet having air permeability, and a gas adsorbent is loaded into each of the formed capsules for sealing. The sheet capsule is arranged between the filter media of the parallel parallel portions.

In the gas adsorbing air filter according to this prior application, in a sheet filter arranged in a zigzag-folded parallel filter medium, for example, between a filter medium having an air inlet opening on the upstream side of the air and a filter medium, the inlet In the portion close to the side, most of the inflowing air flows along the capsule surface, and a part of the air passes through the filter medium and flows out into the space between the adjacent filter mediums. As it progresses toward the center, a small amount of air remaining after passing through the filter medium flows along the capsule surface,
In the portion near the outlet side, the amount of air flowing in contact with the capsule becomes the minimum.

On the contrary, in the sheet capsule disposed in the space between the filter medium having the air outlet opening on the downstream side of the air, the air upstream side is closed, so that the filter medium on both sides passes through this space. The amount of air flowing in from the adjacent space is minimum on the upstream side of the air and increases as it goes to the outlet. Therefore,
The amount of air in contact with the capsule increases on the outlet side.

[0011]

However, in the gas adsorption air filter according to the above-mentioned prior application, since the amount of the gas adsorbent in each capsule of the sheet capsules is evenly filled, for example, the inlet on the upstream side of the air. In the sheet capsule disposed in the space between the filter material with the opening, the gas adsorbent of the capsule near the inlet side becomes saturated faster than the gas adsorbent of the capsule near the outlet side. As a result, the adsorption life becomes non-uniform, the material is wasted, or the adsorption performance is deteriorated and the filter is used.

On the contrary, in the sheet capsule disposed in the space between the filter medium having the air outlet opened on the downstream side of the air, the gas adsorbent of the capsule near the outlet side reaches a saturated state quickly. In this case also, the adsorption life becomes non-uniform.

The present invention has been made in view of the above points, and the adsorption life of each capsule of the sheet capsules disposed between the filter media is made uniform to reduce waste of the adsorbent, and An object of the present invention is to provide a gas adsorption air filter in which the filter is used in a state where it can always exhibit stable and highly reliable adsorption performance.

[0014]

In order to achieve the above object, in the present invention, a zigzag-folded filter medium having parallel folded parallel portions; and a sheet having air permeability, which is independent in a vertical and horizontal direction according to an appropriate arrangement. A plurality of swelling capsules, each of which is filled with a gas adsorbent and sealed to form a sheet capsule; and the sheet between the parallel juxtaposed filter medium and the filter medium. A gas adsorbing air filter having capsules, wherein the amount of gas adsorbent in each capsule of the sheet capsule is in the space between the filter medium with the air inlet opening on the air upstream side and the air inlet side. There is provided a gas adsorption air filter characterized in that the number of capsules is larger than the number of capsules on the outlet side.

Further, in the present invention, a zigzag-folded filter medium having parallel folded back parallel portions; a plurality of capsules which independently swell in a vertical and horizontal direction in a suitable arrangement in a sheet having air permeability are formed. And a sheet capsule in which a gas adsorbent is loaded and sealed in each of the individual capsules; and a gas adsorption air filter in which the sheet capsule is arranged between the filter elements in the parallel parallel portions. ,
In the space between the filter medium with the air outlet opened on the downstream side of the air, the amount of gas adsorbent in each capsule of the sheet capsules is larger in the air outlet side capsule than in the inlet side capsule. A featured gas adsorption air filter is provided.

[0016]

[Function] The amount of the gas adsorbent to be filled in each of the sheet capsules is greater in the space between the filter media having the air inlet opening on the upstream side of the air, as much as the capsule on the inlet side, so that the adsorption becomes saturated. Becomes uniform. Similarly, in the space between the filter media in which the air outlet is opened on the downstream side of the air, more gas adsorbent is filled in the capsule on the outlet side, so that the time when the adsorption is saturated becomes uniform.

[0017]

FIG. 1 is a basic configuration diagram of an embodiment of the present invention.
The filter medium 1 is folded back in a zigzag shape and is in parallel with the parallel filter medium portion 1a.
Have. Sheet capsules 3a, 3b having a plurality of independent capsules 2a, 2b, 2c between each parallel filter medium portion 1a.
Is attached. A gas adsorbent 4 is filled in each capsule 2a, 2b, 2c. Regarding the sheet capsule 3a mounted in the space between the parallel filter media portions 1a in which the air inlet 6a is opened on the air upstream side A of such a filter, the amount of the gas adsorbent 4 in the capsule 2a closest to the air inlet 6a is The largest amount, the smaller the amount in the order of the capsules 2b and 2c. On the other hand, regarding the sheet capsule 3b mounted in the space between the parallel filter media 1a in which the air outlet 6b opens on the air downstream side B, the amount of the gas adsorbent 4 in the capsule 2a on the air outlet 6b side is the largest, and the air upstream. The closer to side A, the smaller the amount of gas adsorbent in the capsule.

In the gas adsorbing air filter having such a structure, the air enters from the inlet 6a on the upstream side A, flows in contact with the capsule 2a of the sheet capsule 3a, and a part of the air passes through the parallel filter medium portion 1a serving as a partition. Flows into the upper stage.
The remaining air flowing to the upper stage flows in contact with the second capsule 2b, and a part of the air passes through the parallel filter medium portion 1a and flows to the upper stage. The remaining air flowing to the upper stage is the third capsule 2
touch c. Therefore, in the capsule sheet 3a provided in the space between the parallel filter media 1a having the air inlet 6a opened on the air upstream side A, the amount of air contact with the capsule 2a closest to the inlet 6a is the largest, The amount of contact of air decreases in the order of the capsules 2b and 2c as it advances in the flow direction of. In the present invention, correspondingly, the amount of the gas adsorbent 4 in the capsule 2a is maximized along with the air flow direction, and the amount is reduced in the order of the capsules 2b and 2c. The amount of air contacting the agent 4 becomes substantially uniform, and there is almost no time difference between the capsules until the gas adsorbent 4 becomes saturated.

On the other hand, in the capsule sheet 3b provided in the space between the parallel filter media 1a having the air outlet 6b on the air downstream side B, the amount of air contact with the capsule 2c closest to the air upstream side A is small. It is the smallest, and the contact amount of air increases in the order of the capsules 2b, 2a as it advances in the air flow direction. In the present invention, in response to this,
Since the amount of the gas adsorbent 4 in the capsule 2c is minimized along the air flow direction and the amount is increased in the order of the capsules 2b and 2a, the amount of air contacting the gas adsorbent 4 in each capsule. Becomes almost uniform, and there is almost no time difference between the capsules until the gas adsorbent 4 becomes saturated.

Embodiments of the present invention will be further described below with reference to the drawings. Hereinafter, the same reference numerals are used for common components in the drawings. FIG. 2 is a perspective view including a cross-sectional view of a gas adsorption air filter according to the present invention. In the figure, 10 is a component frame that defines the unit air filter. Reference numeral 11 denotes a filter medium, which is housed in the frame 10 in a zigzag fold shape in which the filter medium surfaces are folded back in parallel so as to maintain a predetermined interval, and is kept airtight with the inner surface of the frame corresponding to the air upstream side 12,
The seal 13 is provided by known means. The filter medium 11 is made of glass fiber, polypropylene or the like.

Reference numeral 15 is a sheet capsule, which is a capsule-forming sheet 1 made of breathable paper or nonwoven fabric.
4, bulging portion (capsule) 16 in an appropriate arrangement pattern
a, 16b, 16c are press-molded, and a granular gas adsorbent 18 is loaded inside each capsule to form a sealing sheet 20.
It is sealed by.

In this embodiment, as described in the example of FIG. 1, in the capsule sheet between the filter media having the air inlet opening on the air upstream side 12, the gas adsorption is performed in order from the capsule 16a on the air upstream side 12. The amount of material 18 decreases,
The number of capsules 16a near the inlet on the upstream side is the largest, and the number of capsules 16b and 16c decreases in the order of air flow. On the other hand, in the sheet capsule between the filter media having the air outlet on the air downstream side 25, the air downstream side 2
The amount of the gas adsorbent decreases in order from the capsule of No. 5, the capsule 16a on the outlet side is the largest, and the capsules 16b, 16
It decreases in the order of c. The function and effect of such a configuration are similar to those of the example of FIG.

In FIG. 3, a part of the capsule 16 is broken,
The structure of the sheet capsule 15 is illustrated. As the granular gas adsorbent 18, an appropriate material is selected according to a known technique depending on the type of processing gas, and an appropriate size and amount of granules are set based on a predetermined processing amount, processing life, and the like.

Reference numeral 22 (FIG. 2) is a gas adsorbing member, which is composed of two sheet capsules 15 that are stacked with the sealing sheet 20 side facing each other, and the top of the capsule 16 that bulges on both sides in the thickness direction. The distance between them is matched with the distance between adjacent surfaces of the filter medium 11 in zigzag folding. Therefore, the gas adsorbing member 22 functions as a separator between adjacent filter medium surfaces.

Next, the operation will be described with reference to the longitudinal sectional view of the gas adsorption air filter shown in FIG. The arrow A typically shows the flow of air. The filter medium 11 is zigzag-folded so that the gas adsorbing members 22 are spaced apart from each other, and the filter medium portion 11 a is arranged in parallel, and the air inlet 2 opened to the air upstream side 12.
4, there are formed closed filter medium portions 11b, and closed air filter portions 11c, which alternate with the air outlet 27, are formed on the air downstream side 25 in the reverse order of the air upstream side 12. That is, the air inlet 24 on the upstream side 12 is closed to the filter medium 11c on the air downstream side 25, and the portion closed to the filter medium 11b on the upstream side 12 becomes the air outlet 27 on the downstream side 25. With this configuration, the inlet side space portion 60 communicating with the air inlet 24 formed by the folded filter medium and the outlet side space portion 61 communicating with the air outlet 27 are alternately arranged with the parallel filter medium portion 11a interposed therebetween. Is installed in.

Due to the forced air blowing of the air conditioning mechanism, air flows in from the air inlet 24 on the upstream side 12 and flows out from the air outlet 27 on the downstream side 25. Air inlet 24 to inlet side space 60
The contaminated air that has flowed in passes through the intermediate parallel filter medium portion 11 a, flows into the adjacent outlet-side space 61, and flows out from the air outlet 27. Therefore, the contaminated air permeates the capsule forming sheet 14 while flowing along the sheet capsule 15 of the gas adsorbing member 22a disposed in the inlet side space 60, and is contaminated in the air by the gas adsorbent 18 contained in the capsule 16. The removal target gas contained in is adsorbed. Next, the dust component is filtered by passing through the filter medium 11a interposed between the spaces 60 and 61. Further, the passing air flows along the capsule sheet 15 of the gas adsorbing member 22b arranged in the outlet side space 61, is further processed by the gas adsorbent 18 contained therein, and is discharged as clean air.

Regarding three kinds of material sheets having different air permeability used in the embodiment of the capsule forming sheet 14 according to the present invention, the air permeability of the sheet and carbon dioxide gas (CO ₂ ) flowing along the sheet permeate the sheet. Table 1 shows the relationship with the migration rate. As a quantitative indication of air permeability, the air permeability defined in Japanese Industrial Standards: Air permeability test method for paper and board (JIS _P8117-1963 ) was used.

[0028]

[Table 1] Sample Sheet Air Permeability (sec / 100cc) CO ₂ Transfer Rate (%) A 1 Approx. 70 B 2 to 6.5 Approx. 50 C 25 to 50 Approx. 15 As shown in Table 1, Small (highly breathable)
The carbon dioxide gas transfer rate of the sheet is high, and the carbon dioxide gas transfer rate also decreases as the air permeability increases (air permeability decreases). This also applies to other gas components, and generally, a sheet having an air permeability of 100 sec / 100 cc or less is used as the capsule-forming sheet 14 that covers the adsorbent 18. Low air permeability (high air permeability) when a large adsorption effect is expected depending on the specifications.
A sheet is selected, and a sheet having large air permeability (small air permeability) is used for long-term use. That is, as the capsule forming sheet 14, a sheet having appropriate air permeability can be selected according to the application.

On the other hand, when there is no air flow, almost no gas component passing through the sheet is observed, and the capsule-forming sheet 14 functions as a partition wall that blocks the adsorbent 18 and the outside air. For this reason, since the air stays during the suspension period of the air conditioner, the gas component does not permeate the capsule forming sheet 14 and enter the capsule 16, so that the adsorbent 18 contained therein has an unnecessarily adsorbing ability. Will not be consumed.

As shown in FIG. 5, the gas adsorbing member 22
Is configured such that the long axes of the capsules 16 are arranged along the air flow A, and as shown in a cross section in FIG. 6, a space between adjacent capsules 16 is large enough to minimize air resistance. The air flow passage 28 is secured.

FIG. 7 shows a gas adsorption member 3 according to another embodiment.
2 is a cross-sectional view showing a capsule-shaped sheet 34 in which a capsule 36 is formed in a corrugated shape and symmetrically faced to each other and the adsorbent 18 is sealed. The seat can be omitted.

FIG. 8 shows an embodiment of a capsule having another sectional shape. In the figure (a), the capsule forming sheet 44 has a tunnel type (or hat type) cross section.
Shows an example in which capsules 46 of No. 1 are formed, FIG. 7B shows an example in which capsules 56 having a triangular roof type (or V-shaped zigzag type) in cross section are formed on the capsule forming sheet 54, and FIG. An example in which a capsule 66 having a sawtooth cross section is formed on the sheet 64 is shown.

[0033]

As described above, in the gas adsorbing air filter according to the present invention, a sheet capsule is inserted between the filter media and the filter media in the parallel part of the zigzag folded filter media, and each capsule of the sheet capsule is filled. The amount of the gas adsorbent is filled more in the space between the filter media in which the air inlet is opened on the upstream side of the air flow, so that the time when the adsorption is saturated is made uniform among the capsules. Similarly, in the space between the filter media in which the air outlet is open on the downstream side, more space is filled toward the outlet side, so that the time when the adsorption becomes saturated becomes uniform. As a result, the adsorption life of each capsule of the sheet capsules is made uniform, the waste of the adsorbent is eliminated, and the filter is used in a state where the adsorption performance is always stable and highly reliable.

[Brief description of drawings]

FIG. 1 is a basic configuration diagram of an embodiment of the present invention.

FIG. 2 is a perspective view showing a cross section of a part of the gas adsorption air filter according to the present invention.

FIG. 3 is a perspective view showing a cutaway portion of the seat capsule according to the present invention.

FIG. 4 is a vertical sectional view of a gas adsorption air filter according to the present invention.

5 is a cross-sectional view taken along line IV-IV of FIG.

FIG. 6 is a cross-sectional view showing an enlarged part along line VV in FIG.

FIG. 7 is a cross-sectional view showing an enlarged part of a gas adsorbing member according to another embodiment.

FIG. 8 is a cross-sectional view showing various shape examples of capsules.

FIG. 9 is a cross-sectional perspective view of a conventional air filter.

[Explanation of symbols]

 1: Filter medium 2a, 2b, 2c: Capsule 3a, 3b: Sheet capsule 4: Gas adsorbent 6a: Air inlet 6b: Air outlet

 ─────────────────────────────────────────────────── ─── Continued front page (72) Kaoru Umeya Kaoru Umeya 13-30, Yagiyamahonmachi, Taihaku-ku, Sendai-shi, Miyagi 13 (72) Shoji Iwamiya 2-5-12 Kyobashi, Chuo-ku, Tokyo Toyo Heat Kogyo Co., Ltd. (72) Inventor Katsuhiro Uetani 2-5-12 Kyobashi, Chuo-ku, Tokyo Toyo Heat Co., Ltd.

Claims (2)

[Claims] 1. A zigzag-folded filter medium having parallel folded-back parallel portions; a plurality of capsules that independently swell vertically and horizontally in a suitable arrangement in a breathable sheet, and each formed individual A gas adsorption air filter comprising a sheet capsule in which a gas adsorbent is loaded and sealed in a capsule; a gas adsorption air filter in which the sheet capsule is arranged between the filter elements in the parallel and parallel parts, the air upstream side In the space between the filter medium with the air inlet opened in the space between the filter medium, the amount of the gas adsorbent in each capsule of the sheet capsule is larger in the air inlet side capsule than in the air outlet side capsule. A gas adsorption air filter. 2. A zigzag-folded filter medium having parallel folded parallel portions; a plurality of capsules that independently swell in a vertical and horizontal direction in a suitable arrangement in a breathable sheet, and each formed individual A gas adsorption air filter comprising a sheet capsule in which a gas adsorbent is loaded and sealed inside a capsule; a gas adsorption air filter in which the sheet capsule is arranged between the filter elements in the parallel and parallel portions, the air downstream side In the space between the filter medium having the air outlet opened in the space between the filter medium and the filter medium, the amount of the gas adsorbent in each capsule of the sheet capsule is larger in the air outlet side capsule than in the inlet side capsule. Gas adsorption air filter.