JP3884445B2 - Air filter medium and air filter using the same - Google Patents

Air filter medium and air filter using the same Download PDF

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JP3884445B2
JP3884445B2 JP2004101474A JP2004101474A JP3884445B2 JP 3884445 B2 JP3884445 B2 JP 3884445B2 JP 2004101474 A JP2004101474 A JP 2004101474A JP 2004101474 A JP2004101474 A JP 2004101474A JP 3884445 B2 JP3884445 B2 JP 3884445B2
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filter medium
air
filter
bottomed
bottomed hole
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JP2005279594A (en
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健 山口
正昭 渡辺
範一 新舎
慎生 和田
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Nippon Muki Co Ltd
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Description

本発明は、ビル空調用、半導体、食品、病院等のクリーンルーム用の高性能フィルタのプレフィルタ等として使用可能な、低通気抵抗で長寿命のエアフィルタろ材とそれを用いたエアフィルタに関するものである。 The present invention relates for building air conditioning, semiconductor, food, can be used as a pre-filter or the like of the high-performance filter for clean rooms such as hospitals, in the air filter media at low flow resistance life air filter using the same It is.

従来、エアフィルタ用ろ材としては、平板状のパネル形がプレフィルタに一般的に使用されている。ところが、ろ材面積が小さいことから、ろ材をプリーツしてろ材面積を大きくすることが常套手段となっている。
ところが、パネル形はろ材厚さが薄いため通気抵抗は低いものの、粉塵保持容量が小さくてフィルタの寿命は短い問題がある。また、ろ材の厚さを厚くすると、粉塵保持容量は大きくなるものの通気抵抗が大きくなる問題がある。
プリーツ形は、小容積にろ材面積を大きくする関係で、ろ材は薄く通気抵抗は低いものの、粉塵保持容量が小さくてフィルタの寿命は短い問題がある。また、ろ材の厚さを厚くすると、粉塵保持容量は大きくなるものの通気抵抗が大きくなる問題がある。 Conventionally, as a filter material for an air filter, a flat panel shape is generally used for a prefilter. However, since the filter medium area is small, it has become a common practice to increase the filter medium area by pleating the filter medium.
However, the panel type has a thin filter medium and has low ventilation resistance, but has a problem that the dust holding capacity is small and the filter life is short. Further, when the thickness of the filter medium is increased, there is a problem that the dust resistance is increased but the ventilation resistance is increased.
The pleated shape has a problem that the filter medium is thin and the ventilation resistance is low because the filter medium is thin and the ventilation resistance is low because the filter medium is thin and the ventilation resistance is small. Further, when the thickness of the filter medium is increased, there is a problem that the dust resistance is increased but the ventilation resistance is increased.

そこで、本発明は、低通気抵抗で長寿命のエアフィルタろ材及びそれを用いたエアフィルタを提供することを目的とするものである。   Accordingly, an object of the present invention is to provide an air filter medium having a low airflow resistance and a long life and an air filter using the same.

本発明のエアフィルタろ材は、前記課題を解決するためになされたもので、請求項１に記載の通り、ろ材の空気流入側に、空気流出側から空気流入側に向けて開口する有底孔群を設けるとともに、前記ろ材の空気流出側に、空気流入側から空気流出側に向けて開口する有底孔群を、前記空気流入側の有底孔群に対して互い違いに且つ隔壁を存して設けるとともに、貫通孔を備える３枚以上のろ材を積層して構成されたことを特徴とする。
また、請求項２に記載のエアフィルタろ材は、請求項１に記載のエアフィルタろ材において、前記３枚以上のろ材では、空気流出側に積層せれるろ材の密度を、空気流入側に積層されるろ材の密度よりも大きくしたことを特徴とする。
また、請求項３に記載のエアフィルタろ材は、請求項２に記載のエアフィルタろ材において、前記３枚以上の各積層ろ材を繊維から構成し、空気流出側に積層せれるろ材を構成する繊維の平均繊維径を、空気流入側に積層されるろ材を構成する繊維の平均繊維径よりも小さくしたことを特徴とする。
また、請求項４に記載のエアフィルタろ材は、請求項１乃至３のいずれかに記載のエアフィルタろ材において、前記有底孔の孔径を入口から底に向かって徐々に小さくなるようにしたことを特徴とする。
また、本発明のエアフィルタろ材は、請求項５に記載の通り、請求項１乃至４のいずれかに記載のエアフィルタろ材をフィルタ枠に収容したことを特徴とする。 The air filter medium of the present invention is made in order to solve the above-mentioned problem, and has a bottomed hole that opens on the air inflow side of the filter medium from the air outflow side to the air inflow side as described in claim 1. A group of bottomed holes that open from the air inflow side to the air outflow side on the air outflow side of the filter medium, and have a partition wall alternately with respect to the bottomed hole group on the air inflow side. Te provided Rutotomoni, characterized in that it is formed by laminating three or more filter media having a through-hole.
The air filter medium according to claim 2 is the air filter medium according to claim 1, wherein the density of the filter medium stacked on the air outflow side is stacked on the air inflow side in the three or more filter media. It is characterized by being larger than the density of the filter medium .
Further, the air filter medium according to claim 3 is the air filter medium according to claim 2 , wherein each of the three or more laminated filter media is made of fibers, and the fibers constituting the filter media stacked on the air outflow side. The average fiber diameter is made smaller than the average fiber diameter of the fibers constituting the filter medium laminated on the air inflow side .
Further, in the air filter medium according to claim 4, in the air filter medium according to any one of claims 1 to 3, the diameter of the bottomed hole is gradually decreased from the inlet toward the bottom. It is characterized by .
The air filter medium of the present invention is characterized in that, as described in claim 5 , the air filter medium according to any one of claims 1 to 4 is housed in a filter frame.

本発明の請求項１のエアフィルタろ材によれば、流入した空気は有底孔により遮られ、有底孔の延長方向よりも、通気抵抗の低い隔壁を介して、反対側の面側から設けられた貫通孔へと移動することになる。従って、ろ材を厚くしても、低通気抵抗のろ材が得られる。また、単なる平板状のろ材では、ろ材を厚くしても表層部でしか粉塵を捕集できないのに比べ、ろ材を厚くしても効率良く多くの粉塵を保持することができるのでフィルタの寿命を長くできる。また、有底孔間の隔壁の通気抵抗が低いので、スムーズに空気が通り抜けるため、ろ材が厚いにもかかわらず、低通気抵抗のろ材が得られる。また、３枚以上のろ材を積層して構成されるので、単一層のろ材に有底孔を形成する場合に比べて、より簡単に有底孔を形成することができるので、作業効率に優れる。
本発明の請求項２のエアフィルタろ材によれば、通常ろ材で用いられる粗密ろ材（空気流入側で荒い塵埃を捕集し、空気流入面での目詰まりを防止する）を簡単に製作することができる。
本発明の請求項３のエアフィルタろ材によれば、通常ろ材で用いられる繊維径勾配ろ材（空気流入側で荒い塵埃を捕集し、空気流入面での目詰まりを防止する）を簡単に製作することができる。
本発明の請求項４のエアフィルタろ材によれば、空気入口の有底孔の断面積が徐々に小さくなるので、空気が進入するのに従い空気量が減少するのに合わせて流速を一定に保ちつつ、隔壁全体から一様に空気を通り抜けさせることができる。また、傾斜した貫通部隔壁に空気が衝突し易いことも合わさって、低通気抵抗のろ材が得られる。
本発明の請求項５のエアフィルタによれば、上記効果を備えたエアフィルタとすることができ、ビル空調用、半導体、食品、病院、住居用等の空調用として使用できる。 According to the air filter medium of claim 1 of the present invention, the inflowing air is blocked by the bottomed hole, and is provided from the opposite surface side through the partition wall having a lower ventilation resistance than the extending direction of the bottomed hole. It moves to the formed through hole. Therefore, even if the filter medium is thick, a filter medium with low ventilation resistance can be obtained. In addition, with a simple flat filter medium, even if the filter medium is thick, dust can be collected only at the surface layer. Can be long. In addition, since the airflow resistance of the partition wall between the bottomed holes is low, air passes smoothly, and thus a low airflow resistance filter medium can be obtained even though the filter medium is thick. In addition, since it is configured by laminating three or more filter media, the bottomed holes can be more easily formed compared to the case where the bottomed holes are formed in a single layer of filter media, so that the work efficiency is excellent. .
According to the air filter medium of claim 2 of the present invention, it is possible to easily produce a coarse and dense filter medium (collecting rough dust on the air inflow side and preventing clogging on the air inflow surface) normally used in the filter medium. Can do.
According to the air filter medium of claim 3 of the present invention, a fiber diameter gradient filter medium normally used in a filter medium (collecting rough dust on the air inflow side and preventing clogging on the air inflow surface) is easily manufactured. can do.
According to the air filter medium of claim 4 of the present invention, since the cross-sectional area of the bottomed hole of the air inlet is gradually reduced, the flow rate is kept constant as the air volume decreases as the air enters. However, air can be uniformly passed through the entire partition wall. In addition, combined with the fact that air easily collides with the inclined penetrating partition walls, a filter medium with low ventilation resistance can be obtained.
According to the air filter of Claim 5 of this invention, it can be set as the air filter provided with the said effect, and it can be used for the air-conditioning for buildings air-conditioning, a semiconductor, a foodstuff, a hospital, a residence, etc.

図１は、本発明のエアフィルタろ材を組み込んで構成したエアフィルタろ材の正面図であり、また、図２は、図１のＩ−Ｉ線断面図を示している。
図中１はろ材、２は前記ろ材１の正面側に設けられた有底孔、３は前記ろ材１の反対側に設けられた有底孔、４は前記有底孔３、４間に位置する隔壁、１０は前記ろ材１を収容するフィルタ枠を示すものである。 FIG. 1 is a front view of an air filter medium constructed by incorporating the air filter medium of the present invention, and FIG. 2 is a cross-sectional view taken along the line II of FIG.
In the figure, 1 is a filter medium, 2 is a bottomed hole provided on the front side of the filter medium 1, 3 is a bottomed hole provided on the opposite side of the filter medium 1, and 4 is located between the bottomed holes 3 and 4. A partition wall 10 represents a filter frame that accommodates the filter medium 1.

前記ろ材１としては、合成繊維・無機質繊維等の繊維体、合成樹脂・無機質の発泡体、無機質の押出成形体等を使用できる。
前記ろ材１が繊維体である場合、その平均繊維径は０．２〜５０μｍが好ましい。平均繊維径０．２μｍ未満では製造困難で非常に高価であるという問題あり、平均繊維径５０μｍ超では捕集効率が悪くなる問題がある。
前記ろ材１が繊維体である場合、密度は５〜４０ｋｇ／ｍ３とすることが好ましい。密度５ｋｇ／ｍ３未満では捕集効率が悪くなる問題があり、密度４０ｋｇ／ｍ３超では通気抵抗が高くなる問題があるためである。 As the filter medium 1, fiber bodies such as synthetic fibers / inorganic fibers, synthetic resin / inorganic foams, inorganic extruded bodies, and the like can be used.
When the filter medium 1 is a fibrous body, the average fiber diameter is preferably 0.2 to 50 μm. If the average fiber diameter is less than 0.2 μm, there is a problem that the production is difficult and very expensive, and if the average fiber diameter exceeds 50 μm, there is a problem that the collection efficiency is deteriorated.
When the filter medium 1 is a fibrous body, the density is preferably 5 to 40 kg / m 3 . This is because when the density is less than 5 kg / m 3 , there is a problem that the collection efficiency is deteriorated, and when the density exceeds 40 kg / m 3 , there is a problem that the ventilation resistance is increased.

前記ろ材１に設ける有底孔２、３の孔径は、数ｍｍ〜５０ｍｍの円孔が好ましい。但し、これに限定されることなく、三角形、四角形等の多角形の孔でもよい。
前記ろ材１に設ける有底孔２、３の個数は、ろ材１の端面の面積を基準として、１００〜５００個／ｍ２設けることが好ましい。
前記ろ材１に設ける有底孔２、３、即ち、非貫通孔の深さ（Ｈ−Ｈ４）は、ろ材高さＨの１／２〜９／１０が好ましい。 The hole diameter of the bottomed holes 2 and 3 provided in the filter medium 1 is preferably a circular hole of several mm to 50 mm. However, the hole is not limited to this, and may be a polygonal hole such as a triangle or a quadrangle.
The number of the bottomed holes 2 and 3 provided in the filter medium 1 is preferably 100 to 500 / m 2 based on the area of the end face of the filter medium 1.
The bottomed holes 2 and 3 provided in the filter medium 1, that is, the depth (H-H4) of the non-through holes are preferably 1/2 to 9/10 of the filter medium height H.

また、本発明では、有底孔２，３は、互い違いに対称に配置されるようにする。好ましくは、図１に示されるように、隣接する有底孔２，２の中心間を結ぶ直線の垂直二等分線上に、反対面側の有底孔３を隔壁を存して設けるようにする。但し、これに限定されることなく有底孔２と有底孔３は非対称に配置してもよい。例えば、有底孔２を円孔で有底孔３を三角形孔で非対称としてもよい。また、有底孔２の数を有底孔３の数より多くしたり少なくしたりして非対称としてもよい。また、有底孔２を斜め配置とし有底孔３を前記配置に交叉するように配置する非対称としてもよい。 In the present invention, the bottomed holes 2 and 3 are alternately arranged symmetrically. Preferably, as shown in FIG. 1, the bottomed hole 3 on the opposite side is provided on the vertical bisector of the straight line connecting the centers of the adjacent bottomed holes 2 and 2 with a partition wall therebetween. To do. However, the bottomed hole 2 and the bottomed hole 3 may be arranged asymmetrically without being limited thereto. For example, the bottomed hole 2 may be asymmetric with a circular hole and the bottomed hole 3 with a triangular hole. Further, the number of the bottomed holes 2 may be asymmetrical by increasing or decreasing the number of the bottomed holes 3. Further, the bottomed holes 2 may be arranged in an oblique manner, and the bottomed holes 3 may be asymmetrically arranged so as to cross the above-described arrangement.

エアフィルタろ材の空気流入又は空気流出側の何れか一方の面における端面の面積と有底孔群の表面積との和、即ち、空気が接触する表面積は、前記一方の面の端面に有底孔を設けない場合の面積の２〜５倍とすることが好ましい。２倍未満ではろ材面積を増やす効果がなくフィルタの寿命が伸びない問題があり、５倍超では、ろ材の隔壁の厚みが薄くなり粉塵捕集量が小さくなりフィルタの寿命が伸びない問題があるためである。   The sum of the area of the end face on either the air inflow side or the air outflow side of the air filter medium and the surface area of the bottomed hole group, that is, the surface area in contact with air is the bottomed hole on the end face of the one side. It is preferable to make it 2 to 5 times the area in the case of not providing. If it is less than 2 times, there is a problem that the filter media area is not increased and the filter life is not extended. Because.

前記有底孔２、３の総容積は、前記ろ材１の有底孔２、３が無い状態の体積の０．２〜０．５倍とすることが好ましい。０．２倍未満ではろ材の通気抵抗を低くする効果がない問題があり、０．５倍超では、ろ材の厚みが薄くなり粉塵捕集量が小さくなりフィルタの寿命が伸びない問題があるためである。   The total volume of the bottomed holes 2 and 3 is preferably 0.2 to 0.5 times the volume of the filter medium 1 without the bottomed holes 2 and 3. If it is less than 0.2 times, there is a problem that the ventilation resistance of the filter medium is not lowered, and if it exceeds 0.5 times, there is a problem that the thickness of the filter medium becomes thin and the amount of dust collected becomes small and the filter life is not extended. It is.

前記ろ材１は単一層でもよいが、多層構造として、特に、貫通孔を備える３枚以上のろ材を積層して構成することにより、容易に有底孔を備えたろ材を作製することができる。勿論、貫通孔と非貫通孔を備えるろ材を複数枚積層したり、貫通孔と非貫通孔を備えるろ材と、貫通孔を備えるろ材を積層したりして作製することは任意である。   Although the filter medium 1 may be a single layer, a filter medium having a bottomed hole can be easily produced by laminating three or more filter media having through-holes as a multilayer structure. Of course, it is optional to stack a plurality of filter media having through holes and non-through holes, or to laminate a filter medium having through holes and non-through holes and a filter medium having through holes.

また、空気流出側に積層されるろ材の密度を、空気流入側に積層されるろ材の密度よりも大きくすれば、通常ろ材で用いられる繊維径勾配ろ材（空気流入側で荒い塵埃を捕集し、空気流入面での目詰まりを防止する）を簡単に製作することができる。例えば、空気流入側に積層されるろ材の密度は、５〜１０ｋｇ／ｍ３で、空気流出側に積層されるろ材の密度は１０〜４０ｋｇ／ｍ３とすることができる。 Also, if the density of the filter media stacked on the air outflow side is greater than the density of the filter media stacked on the air inflow side, the fiber diameter gradient filter media normally used in filter media (collecting rough dust on the air inflow side). , Preventing clogging at the air inflow surface). For example, the density of the filter material to be laminated on the air inlet side, at 5 to 10 kg / m 3, the density of the filter material to be laminated on the outflow side can be 10~40kg / m 3.

また、前記空気流出側に積層されるろ材を構成する繊維の平均繊維径を、前記空気流入側に積層されるろ材を構成する繊維の平均繊維径よりも小さくすれば、通常ろ材で用いられる繊維径勾配ろ材（空気流入側で荒い塵埃を捕集し、空気流入面での目詰まりを防止する）を簡単に製作することができる。例えば、空気流出側に積層されるろ材の平均繊維径は１０〜５０μｍとし、空気流入側に積層されるろ材の平均繊維径は０．２〜１０μｍとすることができる。
上記したろ材は、公知のフィルタ枠に収容され、エアフィルタとすることができる。 Further, if the average fiber diameter of the fibers constituting the filter medium laminated on the air outflow side is made smaller than the average fiber diameter of the fibers constituting the filter medium laminated on the air inflow side, fibers normally used in the filter medium A radial gradient filter medium (which collects rough dust on the air inflow side and prevents clogging on the air inflow surface) can be easily manufactured. For example, the average fiber diameter of the filter medium laminated on the air outflow side can be 10 to 50 μm, and the average fiber diameter of the filter medium laminated on the air inflow side can be 0.2 to 10 μm.
The above-described filter medium can be housed in a known filter frame to form an air filter.

下記の通り、実施例１〜６と比較例１、２のろ材を作製し、その通気抵抗、ろ材の寿命及びろ材コストを評価することとした。   The filter media of Examples 1 to 6 and Comparative Examples 1 and 2 were prepared as described below, and the ventilation resistance, filter media life and filter media cost were evaluated.

（実施例１）
実施例１のろ材を作製するために、平均繊維径６μｍのガラス繊維で構成され、密度７ｋｇ／ｍ３とした、幅４０ｃｍ、長さ４０ｃｍで、所定の厚さに形成したグラスウール板を使用し、図３（ａ）に示すように、第１層、第２層及び第３層を構成するろ材１Ａ、１Ｂ、１Ｃとして、それぞれ、２５ｍｍ、５０ｍｍ、２５ｍｍの厚さに形成したものを用意した。
次に、ろ材１Ａには、図１に示すように、正面側には、直径３０ｍｍの円形状の貫通孔を孔の中心間距離を３７．５ｍｍとして、グリッド状に６０個設けた。また、裏面側には、直径３０ｍｍ、深さ１２．５ｍｍの有底孔を、正面側の貫通孔のグリッドの中心部近傍に位置するようにして６０個設けた。
次に、ろ材１Ｃには、前記ろ材１Ａの貫通孔に対応する位置には、直径３０ｍｍ、深さ１２．５ｍｍの有底孔を設け、設けられた有底孔のグリッドの中央部近傍には、直径３０ｍｍの貫通孔を互い違いにして設けるようにした。
次に、ろ材１Ｂには、前記ろ材１Ａの貫通孔及びろ材１Ｃの貫通孔に連通するように貫通孔を設けるようにした。そして、これらろ材１Ａ、１Ｂ及び１Ｃを、図３に示すようにして、接着して、正面側と背面側とにそれぞれ、深さ８７．５ｍｍの有底孔２、３を有するろ材１を作製した。 Example 1
In order to produce the filter medium of Example 1, a glass wool plate made of glass fibers having an average fiber diameter of 6 μm, having a density of 7 kg / m 3 , a width of 40 cm, a length of 40 cm and a predetermined thickness was used. As shown in FIG. 3A, the filter media 1A, 1B, and 1C constituting the first layer, the second layer, and the third layer were prepared to have thicknesses of 25 mm, 50 mm, and 25 mm, respectively. .
Next, as shown in FIG. 1, the filter medium 1 </ b> A was provided with 60 circular through holes with a diameter of 30 mm on the front side in a grid shape with a distance between the centers of the holes of 37.5 mm. In addition, 60 bottomed holes having a diameter of 30 mm and a depth of 12.5 mm were provided on the back surface side so as to be located near the center of the grid of the through holes on the front side.
Next, the filter medium 1C is provided with a bottomed hole having a diameter of 30 mm and a depth of 12.5 mm at a position corresponding to the through hole of the filter medium 1A, and in the vicinity of the center of the grid of the provided bottomed holes. The through-holes having a diameter of 30 mm are provided alternately .
Next, a through hole was provided in the filter medium 1B so as to communicate with the through hole of the filter medium 1A and the through hole of the filter medium 1C. And these filter media 1A, 1B, and 1C are adhere | attached as shown in FIG. 3, and the filter media 1 which has the bottomed holes 2 and 3 of depth 87.5mm on the front side and the back side, respectively are produced. did.

（実施例２）
図３（ｂ）に示すように、ろ材１Ａ及びろ材１Ｃには、有底孔を設けず、直径３０ｍｍの貫通孔を設けるようにしたこと以外は、実施例１と同様にして、深さ７５ｍｍの有底孔２、３を有するろ材１を作製した。 (Example 2)
As shown in FIG. 3B, the filter medium 1A and the filter medium 1C have a depth of 75 mm in the same manner as in Example 1 except that a bottomed hole is not provided and a through hole having a diameter of 30 mm is provided. The filter medium 1 having the bottomed holes 2 and 3 was prepared.

（実施例３）
ろ材１を、図３（ｃ）に示すように、厚さ５０ｍｍの２層のろ材１Ｄ、１Ｅにより構成し、ろ材１Ｄ、１Ｅには、実施例２のろ材１Ａ、１Ｃと同様にして貫通孔を設けるようにして、これらを接着して、正面側と背面側とにそれぞれ、深さ５０．０ｍｍの有底孔２、３を有するろ材１を作製した。尚、ろ材１Ｄ、１Ｅの材料等は、実施例１と同じものを使用した。 (Example 3)
As shown in FIG. 3C, the filter medium 1 is composed of two layers of filter media 1D and 1E having a thickness of 50 mm, and the filter media 1D and 1E have through-holes in the same manner as the filter media 1A and 1C of the second embodiment. Thus, a filter medium 1 having bottomed holes 2 and 3 each having a depth of 50.0 mm was produced on the front side and the back side, respectively. In addition, the same material as Example 1 was used for the filter media 1D and 1E.

（実施例４）
図３（ｄ）に示すように、実施例３のろ材１Ｄ、１Ｅの厚さを、それぞれ２５ｍｍとした以外は、実施例３と同様にして、深さ２５．０ｍｍの有底孔２、３を有するろ材１を作製した。 Example 4
As shown in FIG. 3 (d), the bottomed holes 2, 3 having a depth of 25.0 mm are the same as in Example 3, except that the thickness of the filter media 1D, 1E of Example 3 is 25 mm. A filter medium 1 having

（実施例５）
図３（ｅ）に示すように、ろ材１の有底孔の直径が表面の開口部では３６ｍｍとし、底部では２４ｍｍとなるように徐々に孔径を小さくなるようにした以外は、実施例２と同様にして、ろ材１を作製した。 (Example 5)
As shown in FIG. 3 (e), the diameter of the bottomed hole of the filter medium 1 is 36 mm at the opening on the surface, and the hole diameter is gradually reduced so as to be 24 mm at the bottom. Similarly, the filter medium 1 was produced.

（実施例６）
図３（ｆ）に示すように、実施例１のろ材１を単一のろ材から構成した以外は、実施例１と同様の材料等を使用して、ろ材１を作製した。 (Example 6)
As shown in FIG. 3 (f), a filter medium 1 was produced using the same material as in Example 1 except that the filter medium 1 of Example 1 was composed of a single filter medium.

（比較例１）
図３（ｇ）に示すように、３層のろ材から構成し、空気流入側に直径３０ｍｍ、深さ７５ｍｍの有底孔を、中心間距離３７．５ｍｍ間隔でグリッド状に配置した以外は、実施例１と同様の材料等を使用してろ材１を作製した。 (Comparative Example 1)
As shown in FIG. 3 (g), it is composed of three layers of filter media, except that holes with a diameter of 30 mm and a depth of 75 mm are arranged on the air inflow side in a grid shape with a center-to-center distance of 37.5 mm. The filter medium 1 was produced using the same material as in Example 1.

（比較例２）
図３（ｈ）に示すように、実施例１と同様の材料を使用して、孔を設けないろ材１を作製した。 (Comparative Example 2)
As shown in FIG. 3 (h), a filter medium 1 having no holes was produced using the same material as in Example 1.

下記表１に実施例１〜６及び比較例１、２の構成について記載し、評価結果については表２に記載した。
尚、表１において、比１とは、ろ材の空気流入又は空気流出側の何れか一方の面側における空気が接触する表面積を、一方の端面の面積（有底孔群を設けないろ材の端面の面積）で除したものである。具体的に説明すると、図１に示されるものでは、比１は下記式により求めることができる。
（πＡ（Ｈ−Ｈ４）ｎ＋Ｌ・Ｄ）／（Ｌ・Ｄ）
Ａ：有底孔の直径
Ｌ：ろ材の長さ
Ｄ：ろ材の幅
Ｈ：ろ材の高さ
ｎ：正面側の有底孔の数
Ｌ・Ｄ：ろ材の端面の面積（有底孔群を設けない場合）
（Ｈ−Ｈ４）：有底孔の深さ The following Table 1 describes the configurations of Examples 1 to 6 and Comparative Examples 1 and 2, and the evaluation results are listed in Table 2.
In Table 1, the ratio 1 refers to the surface area of the air in contact with the air inflow side or the air outflow side of the filter medium, the area of one end face (the end face of the filter medium without the bottomed hole group). Divided by the area. Specifically, in the case shown in FIG. 1, the ratio 1 can be obtained by the following equation.
(ΠA (H−H4) n + LD) / (LD)
A: Diameter of the bottomed hole L: Length of the filter medium D: Width of the filter medium H: Height of the filter medium n: Number of bottomed holes on the front side L / D: Area of the end face of the filter medium (providing a group of bottomed holes) If not)
(H-H4): Depth of bottomed hole

また、比２とは、有底孔の総容積を、ろ材の有底孔が無い状態の体積で除したものである。具体的に説明すると、図１に示されるものでは、比２は下記式により求めることができる。
（π（Ａ／２）２・（Ｈ−Ｈ４）・２ｎ）／（Ｌ・Ｄ・Ｈ）
２ｎ：正面側及び裏面側の有底孔の数 The ratio 2 is the total volume of the bottomed holes divided by the volume of the filter medium without the bottomed holes. Specifically, in the case shown in FIG. 1, the ratio 2 can be obtained by the following equation.
(Π (A / 2) 2 · (H−H4) · 2n) / (L · D · H)
2n: Number of bottomed holes on the front side and the back side

ろ材の通気抵抗の評価としては、０．５ｍ／ｓ通風時の圧力損失測定により、比較例２を１００として、相対評価により１０以下を◎、１１〜５０を○、５１〜１００を△、１０１以上を×とした。
また、ろ材の寿命の評価としては、ＪＩＳ Ｂ９９０８の試験方法により、比較例２を１として、相対評価により４倍以上を◎、２倍以上を○、２倍未満を△、１倍未満を×とした。 As the evaluation of the airflow resistance of the filter medium, Comparative Example 2 is set to 100 by measuring the pressure loss when 0.5 m / s is ventilated, and 10 or less is evaluated as ◎, 11 to 50 as ◯, 51 to 100 as △, 101. The above was set as x.
Moreover, as an evaluation of the life of the filter medium, according to the test method of JIS B9908, Comparative Example 2 was set to 1, and relative evaluation was 4 times or more, ◎, 2 times or more, ◯, 2 times less, △, less than 1 time × It was.

Figure 0003884445
Figure 0003884445

Figure 0003884445
Figure 0003884445

表２に示される通り、本発明の実施例１〜５は、ろ材を３層重ねて製作しており、ろ材の開孔の作業効率に優れており、ろ材の材料費と合わせた加工費のコストが安価である。本発明の実施例６は、単一層タイプのため、加工費は高いものの、この点以外は、比較例１、２よりも優れていることがわかった。
また、本発明の実施例１、２、５、６は、一方の側の有底孔と、他方の側の有底孔とを隔てる隔壁面積が大きいため、特にフィルタの通気抵抗を低くすることができる。
また、本発明の実施例３は、空気が流れるろ材の厚みが厚いためろ材抵抗が大きくなり、フィルタの通気抵抗がやや悪くなる。
また、本発明の実施例４は、他の例と比べてろ材厚さを半分にしたため、ろ材空気通過面積及びろ材中の有底孔の体積が少なくなり、フィルタの通気抵抗とフィルタの寿命共にやや悪くなる。
また、比較例１は、有底孔がないためフィルタの通気抵抗が高い問題があり、塵埃も空気入口側の表層部で捕集されて厚さを十分に利用できないのでフィルタの寿命も悪くなる問題がある。
また、比較例２は、有底孔が空気入口側にしかないため、最終層で急激に抵抗が高くなりフィルタの通気抵抗が高い問題があり、空気出口側には有底孔がないため隔壁を通して有底孔から有底孔への空気の通過もできないので、隔壁での捕集が十分に利用できないのでフィルタの寿命も悪くなる問題がある。 As shown in Table 2, Examples 1 to 5 of the present invention are manufactured by stacking three layers of filter media, which is excellent in the work efficiency of opening the filter media, and the processing cost combined with the material cost of the filter media. Cost is low. Since Example 6 of the present invention was a single layer type, the processing cost was high, but it was found that, except this point, it was superior to Comparative Examples 1 and 2.
In addition, in Examples 1, 2, 5, and 6 of the present invention, since the partition wall area separating the bottomed hole on one side and the bottomed hole on the other side is large, the ventilation resistance of the filter is particularly lowered. Can do.
Further, in Example 3 of the present invention, since the thickness of the filter medium through which air flows is thick, the resistance of the filter medium is increased, and the ventilation resistance of the filter is slightly deteriorated.
Further, in Example 4 of the present invention, the thickness of the filter medium is halved compared to the other examples, so that the air passage area of the filter medium and the volume of the bottomed hole in the filter medium are reduced, and both the ventilation resistance of the filter and the life of the filter are both Slightly worse.
Further, Comparative Example 1 has a problem that the ventilation resistance of the filter is high because there is no bottomed hole, and dust is also collected at the surface layer portion on the air inlet side, so that the thickness cannot be fully utilized, so the filter life is also deteriorated. There's a problem.
Further, in Comparative Example 2, since the bottomed hole is only on the air inlet side, there is a problem that the resistance rapidly increases in the final layer and the ventilation resistance of the filter is high, and there is no bottomed hole on the air outlet side. Since the passage of air from the bottomed hole to the bottomed hole is also impossible, there is a problem that the filter life is deteriorated because the trapping by the partition walls cannot be fully utilized.

本発明エアフィルタ用ろ材を備えたエアフィルタの正面図Front view of an air filter provided with a filter medium for air filter of the present invention 図１のＩ−Ｉ線断面図Sectional view taken along the line II of FIG. （ａ）〜（ｈ）実施例及び比較例のろ材の説明のための模式図(A)-(h) The schematic diagram for description of the filter medium of an Example and a comparative example

符号の説明Explanation of symbols

１ ろ材
２ 有底孔
３ 有底孔
４ 隔壁
１０ フィルタ枠 DESCRIPTION OF SYMBOLS 1 Filter medium 2 Bottomed hole 3 Bottomed hole 4 Bulkhead 10 Filter frame

Claims (5)

ろ材の空気流入側に、空気流出側から空気流入側に向けて開口する有底孔群を設けるとともに、前記ろ材の空気流出側に、空気流入側から空気流出側に向けて開口する有底孔群を、前記空気流入側の有底孔群に対して互い違いに且つ隔壁を存して設けるとともに、貫通孔を備える３枚以上のろ材を積層して構成されたことを特徴とするエアフィルタろ材。 A bottomed hole group that opens from the air outflow side to the air inflow side is provided on the air inflow side of the filter medium, and a bottomed hole that opens from the air inflow side to the air outflow side on the air outflow side of the filter medium. air filter, characterized in that the group of, Rutotomoni provided exist a staggered and partition wall with respect to the bottomed hole group of the air inflow side, which is formed by laminating three or more filter media having a through-hole Filter media. 前記３枚以上のろ材では、空気流出側に積層せれるろ材の密度を、空気流入側に積層されるろ材の密度よりも大きくしたことを特徴とする請求項１に記載のエアフィルタろ材。 2. The air filter medium according to claim 1 , wherein the density of the filter medium stacked on the air outflow side is greater than the density of the filter medium stacked on the air inflow side in the three or more filter media. 前記３枚以上の各積層ろ材を繊維から構成し、空気流出側に積層せれるろ材を構成する繊維の平均繊維径を、空気流入側に積層されるろ材を構成する繊維の平均繊維径よりも小さくしたことを特徴とする請求項２に記載のエアフィルタろ材。 Each of the three or more laminated filter media is composed of fibers, and the average fiber diameter of the fibers constituting the filter medium laminated on the air outflow side is larger than the average fiber diameter of the fibers constituting the filter medium laminated on the air inflow side. The air filter medium according to claim 2 , wherein the air filter medium is made smaller. 前記有底孔の孔径を入口から底に向かって徐々に小さくなるようにしたことを特徴とする請求項１乃至３のいずれかに記載のエアフィルタろ材。 The air filter medium according to any one of claims 1 to 3, wherein the diameter of the bottomed hole is gradually reduced from the inlet toward the bottom. 請求項１乃至４のいずれかに記載のエアフィルタろ材をフィルタ枠に収容したことを特徴とするエアフィルタろ材。 Claims 1 to air filter media, characterized in that accommodating the air filter media according to the filter frame to one of the 4.
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