KR19990017059A - Dust collection filter of electrostatic precipitator - Google Patents
Dust collection filter of electrostatic precipitator Download PDFInfo
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- KR19990017059A KR19990017059A KR1019970039826A KR19970039826A KR19990017059A KR 19990017059 A KR19990017059 A KR 19990017059A KR 1019970039826 A KR1019970039826 A KR 1019970039826A KR 19970039826 A KR19970039826 A KR 19970039826A KR 19990017059 A KR19990017059 A KR 19990017059A
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- electrostatic precipitator
- dust
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- discharge
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
- B03C3/14—Plant or installations having external electricity supply dry type characterised by the additional use of mechanical effects, e.g. gravity
- B03C3/155—Filtration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/04—Plant or installations having external electricity supply dry type
- B03C3/08—Plant or installations having external electricity supply dry type characterised by presence of stationary flat electrodes arranged with their flat surfaces parallel to the gas stream
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- Disinfection, Sterilisation Or Deodorisation Of Air (AREA)
Abstract
본 발명은 전기집진기의 집진필터를 콤팩트화 함과 함께 탈취/살균 기능을 갖게 하는 구조에 관한 것으로, 방전선(5)과 방전대응극(6)을 구비한 전리부, 금망, 포집부가 순차적으로 배치된 집진필터에 있어서, 전리부와 금망 사이에 유전체망이 설치됨을 특징으로 하는 전기집진기의 집진필터에 관한 기술이다.The present invention relates to a structure for compacting the dust collecting filter of the electrostatic precipitator and having a deodorizing / sterilizing function. The ionizing part, the gold screen and the collecting part having the discharge line 5 and the discharge counter electrode 6 are sequentially In the dust collector filter arranged, it is a technique related to the dust collector filter of the electrostatic precipitator, characterized in that a dielectric network is installed between the ionizing portion and the gold mesh.
Description
본 발명은 전기집진기의 집진필터구조에 관한 것으로, 특히 집진필터를 콤팩트화 함과 함께 미생물 증식 억제 및 탈취기능을 갖게 하는데 적합한 구조에 관한 것이다.The present invention relates to a dust collecting filter structure of an electrostatic precipitator, and more particularly, to a structure suitable for compacting the dust collecting filter and suppressing microbial growth and deodorizing function.
종래의 전기집진기는 도 1 및 도 2에 나타낸 바와 같이, 본체(1) 전방에는 모터의 구동력을 받아 회전하면서 흡입력을 발생시키는 팬(2)에 의해 실내공기가 흡입되는 흡입그릴(3)이 설치되고, 흡입그릴(3) 후방에는 1차적으로 큰 먼지를 제거하는 프리필터(4)가 설치되며, 프리필터(4) 후방에는 방전선(5)과 평판으로된 방전대응극(6)이 일정간격을 두고 절연되어 미세한 먼지를 강제로 전리시키는 전리부(A)가 설치되고, 후방에는 알루미늄(Al) 그릴로된 금망(17)이 설치된다.As shown in FIGS. 1 and 2, a conventional electrostatic precipitator has a suction grill 3 in which indoor air is sucked by a fan 2 that generates suction while rotating by receiving a driving force of a motor. The pre-filter 4 for removing large dust is installed at the rear of the suction grill 3, and the discharge line 5 and the discharge counter electrode 6 made of a flat plate are fixed at the rear of the pre-filter 4. An ionizing portion A is insulated at intervals and forcibly ionizes fine dust, and a gold mesh 17 made of aluminum (Al) grill is installed at the rear.
그리고 금망(17) 후방의 포집부케이스(7)내에는 순차적으로 절연성이 좋은 수지물인 포집전극판(8)과 가속전극판(9)이 삽입되며, 포집전극판(8)과 가속전극판(9) 각각의 외주면에는 간격을 유지하는 돌기(10)가 형성되고, 상기 돌기가 형성된 포집전극판(8) 및 가속전극판(9)의 중앙에는 도전성 도료 또는 알루미늄 박지 등의 도전층으로 이루어진 포집부(B)로 구성된다.In addition, a collecting electrode plate 8 and an acceleration electrode plate 9, which are resins having good insulating properties, are sequentially inserted into the collecting unit case 7 behind the gold mesh 17, and the collecting electrode plate 8 and the acceleration electrode plate ( 9) Each outer circumferential surface is formed with a projection 10 to maintain a gap, and the center of the collecting electrode plate 8 and the acceleration electrode plate 9 is formed with a conductive layer such as a conductive paint or aluminum foil It consists of part (B).
상기 전리부(A), 금망(17), 포집부(B)를 총칭하여 집진필터라 한다.The ionizing part (A), the gold screen 17, and the collecting part (B) are collectively called a dust collecting filter.
상기 포집부(B) 후방에는 탈취필터(11)가 구성된다.The deodorizing filter 11 is configured behind the collecting part B.
상기 포집전극판 인가단자(12)는 전리부의 방전선(5)과 접지되고, 가속전극판 인가단자(13)는 방전선(5)과 동일전극의 전압이 인가되도록 하며, 전리부케이스(14)에 설치된 지지대(15)를 통하여 방전선(5)에 통상직류 6∼8㎸의 전압이 인가되도록 한다.The collecting electrode plate applying terminal 12 is grounded with the discharge line 5 of the ionizing portion, and the acceleration electrode plate applying terminal 13 allows the voltage of the same electrode to be applied to the discharge line 5 and the ionizing portion case 14. 6 to 8 kW of direct current is applied to the discharge line 5 through the support 15 provided in the "
상기 구성에 따른 작동을 설명한다.The operation according to the above configuration will be described.
전원이 인가되면 팬(2)의 흡입력에 따라 공기가 흡입그릴(3)을 통해서 유입되어 프리필터(4)에서 큰 먼지는 제거되고, 방전선(5)에 전압이 인가되면 방전대응극(6)과의 사이에 코로나 방전이 발생되어 이 사이를 통과한 미세먼지는 하전을 갖고 강제 전리된다.When power is applied, air flows through the suction grill 3 according to the suction force of the fan 2, so that large dust is removed from the prefilter 4, and when a voltage is applied to the discharge line 5, the discharge counter electrode 6 Corona discharge is generated between) and fine dust passing between them is charged and forcedly ionized.
상기 하전된 큰 먼지는 금망(17)에 걸리지고 이를 통과한 먼지등이 포집부케이스(7) 내부를 통과하면서 가속전극판(9)과 포집전극판(8)사이의 전계 강도에 의해 상기 포집전극판(8)의 도전층에 쿨롱력의 작용으로 먼지가 포집되고, 가속전극판(9)의 도전층에도 일부 먼지가 포집되며, 냄새성분은 탈취필터(11)에서 제거되어 청정공기가 토출그릴(16)을 통해서 외부로 배출된다.The charged large dust is caught by the gold mesh 17 and the dust, which has passed therethrough, passes through the collecting part case 7 and is collected by the electric field strength between the acceleration electrode plate 9 and the collecting electrode plate 8. Dust is collected by the Coulomb force on the conductive layer of the electrode plate 8, some dust is also collected by the conductive layer of the acceleration electrode plate 9, and the odor component is removed from the deodorizing filter 11 to discharge clean air. It is discharged to the outside through the grill 16.
그러나 상기 구조에서 집진필터는 도 3에 나타낸 바와같이, 알루미늄(Al)으로된 금망(17)은 도전체임으로 방전선(5)에서 방전대응극(6)까지의 간격(a)가 방전선(5)에서 금망(17)까지의 간격(b)보다 좁아야 되지만 방전선(5)과 방전대응극(6)의 간격(a)는 방전효율을 위해 일정간격을 유지하여야 되므로 방전선(5)과 금망(17)간의 간격(b)이 넓어질 수 밖에 없다.However, in the above structure, as shown in FIG. 3, the dust collecting filter is made of aluminum (Al), and thus, a gap (a) from the discharge line 5 to the discharge counter electrode 6 is a conductor. It should be narrower than the spacing b from 5) to the gold mesh 17, but the spacing a between the discharge line 5 and the discharge counter electrode 6 should be maintained at a constant spacing for the discharge efficiency. And the distance (b) between the gold mesh 17 is bound to be widened.
따라서 이와 같은 넓은 간격(b)로 인해 집진필터 전체의 부피가 커질 수 밖에 없고 또한 상기 구조에서는 미생물을 포함한 미세먼지를 비롯한 냄새를 제거하는데 한계가 있다.Therefore, due to such a wide spacing (b) it is bound to increase the volume of the entire dust collecting filter and there is a limit in removing the smell, including the fine dust containing microorganisms in the structure.
본 발명은 상기한 종래의 문제점을 해결하기 위해 안출한 것으로, 전리부와 금망의 간격을 좁혀 전체적으로 콤팩트화 함과 함께 살균 및 탈취기능을 가질 수 있는 집진필터 구조를 제공하고자 하는데 그 목적이 있다.The present invention has been made to solve the above-mentioned problems, and to provide a dust collecting filter structure that can have a sterilization and deodorization function as well as compact as a whole by narrowing the distance between the ionizing portion and the gold mesh.
도 1은 종래의 전기집진기를 나타낸 종단면도1 is a longitudinal sectional view showing a conventional electrostatic precipitator
도 2는 도 1에 설치된 집진필터의 분해사시도2 is an exploded perspective view of the dust collecting filter installed in FIG.
도 3은 종래 집진필터의 확대 종단면도3 is an enlarged longitudinal sectional view of a conventional dust collecting filter;
도 4는 본 발명에 따른 집진필터의 확대 종단면도4 is an enlarged longitudinal sectional view of the dust collecting filter according to the present invention;
도 5는 TiO2광촉매반응 메카니즘 상태도5 is a state diagram of the TiO 2 photocatalytic reaction mechanism
＊ 도면의 주요부분에 대한 부호의 설명＊ Explanation of symbols on main parts of drawing
A : 전리부 18 : 유전체망A: ionizing part 18: dielectric network
19 : 금망19: gold mesh
상기 목적 달성을 위한 본 발명은 방전선과 방전대응극을 구비한 전리부, 금망, 포집부를 포함한 전기집진기에 있어서, 방전선과 방전대응극의 간격보다 방전선과 금망의 간격을 짧게 하기 위해 전리부와 금망 사이에 유전체망을 구비함을 특징으로 한다.The present invention for achieving the above object is an electrostatic precipitator including an ionizing unit, a gold screen, and a collecting unit having a discharge line and a discharge counter electrode, in order to shorten the distance between the discharge line and the gold mesh than the distance between the discharge line and the discharge counter electrode It is characterized by having a dielectric network therebetween.
상기 유전체망은 플라스틱 금망에 광촉매물질이 코팅된 것이다.The dielectric network is coated with a photocatalytic material on a plastic gold mesh.
도 4는 본 발명에 따른 집진필터의 종단면도를 나타낸 것이다.Figure 4 shows a longitudinal cross-sectional view of the dust collecting filter according to the present invention.
이에 도시된 바와 같이, 방전선(5)과 방전대응극(6)을 구비한 전리부(A) 후방에 순차적으로 유전체망(18)과 금망(19)이 설치되고, 그 후방에는 포집부(B)를 갖는 집진필터로 구성된다.As shown in the drawing, the dielectric network 18 and the gold mesh 19 are sequentially installed behind the ionizing portion A having the discharge line 5 and the discharge counter electrode 6, and the collecting portion ( And a dust collecting filter having B).
상기 구성에서 방전선(5)과 금망(19)의 간격(b')이 방전선(5)과 방전대응극의 간격(a)보다 짧다.In this configuration, the interval b 'between the discharge line 5 and the gold mesh 19 is shorter than the interval a between the discharge line 5 and the discharge counter electrode.
이와 같이 간격(b')을 짧게 할 수 있음은 전리부(A)와 금망(19) 사이에 유전체망(18)을 구성시킴으로써 가능한 것이다.It is possible to shorten the interval b 'in this manner by forming the dielectric network 18 between the ionizing portion A and the gold mesh 19.
상기 유전체망(18)으로써 일예를 들면 테프론망은 전하를 차단하여 주므로 방전대응극(6)과의 사이에 발생하는 방전이 금망(19)에 직접 미치지 않게 된다.As the dielectric network 18, for example, the Teflon network blocks electric charges, so that the discharge generated between the discharge counter electrode 6 does not directly reach the gold network 19.
이와 같이 금망(19)을 전리부에 근접되게 설치함으로써 집진필터를 전체적으로 콤팩트하게 할 수 있다.Thus, by providing the gold mesh 19 close to the ionizing portion, the dust collecting filter can be made compact in its entirety.
유전체망(19)에 광촉매물질, 예로써 산화티타늄(TiO2)를 코팅한 것은 방전선(5)에서 발산되는 자외선의 광원과 반응하여 탈취/살균기능을 부여하기 위한 것이고, 이때 TiO2는 결정형태가 Anatase 상으로 이루어진 것이 바람직하다.The coating of the photocatalytic material, for example titanium oxide (TiO 2 ), on the dielectric network 19 is to give a deodorizing / sterilizing function by reacting with a light source of ultraviolet rays emitted from the discharge line 5, wherein TiO 2 is a crystal. It is preferable that the form consists of an Anatase phase.
TiO2인 광촉매는 빛을 흡수하여 에너지가 높은 상태가 되고 그 에너지를 반응물질에 주어 화학반응을 일으키게 한다.The photocatalyst, TiO 2 , absorbs light and becomes high in energy, giving it to the reactant to cause a chemical reaction.
도 5는 TiO2광촉매반응 메카니즘에 따른 여기(勵起)상태를 나타낸 것으로, 자외선광이 TiO2에 조사되면 Valence Band(原子價電子)에 있는 전자가 Conduction Band(전도띠)으로 전이되어 음전기를 지닌 전자와 Valence Band에 양전기를 지닌 정공(正孔)이 생성된다.FIG. 5 shows an excited state according to a TiO 2 photocatalytic reaction mechanism. When ultraviolet light is irradiated onto TiO 2 , electrons in a valence band are transferred to a conduction band to generate a negative electric charge. Positive electrons are generated in the electrons and valence bands.
상기와 같은 전자와 정공은 매우 강한 환원력과 산화력을 갖고 있고, 하기 반응식에 의해 OH radical 이나 슈퍼옥사이드엔아이온(O2 -) 등의 활성산소를 발생한다.The electrons and holes as described above have very strong reducing power and oxidizing power, and generate active oxygen such as OH radical and superoxide enion (O 2 − ) by the following reaction formula.
OH radical은 냄새, 균, 오염물 등을 살균시키는 강한 산화력을 갖고 있는 성질이 있다.OH radical has a strong oxidizing power to sterilize odors, bacteria and contaminants.
즉, e-(Conductin Band에 전이된 전자), h+(Valencce Band에 남은 정공)은 TiO2표면에서 확산, 이동하여 하기와 같은 반응을 갖는다.That is, e − (electrons transitioned to the conductor band) and h + (holes remaining in the valencce band) diffuse and move on the TiO 2 surface to have a reaction as follows.
상기와 같이 확산된 h+는 물속의 수산화이온과 반응해서 OH를 생성, 물분자와 반응해서 OH과 OH+ion을 생성하여 직접 유기물과 반응 유기물을 산화시킨다.H + diffused as described above reacts with hydroxide ions in water to produce OH, and reacts with water molecules to produce OH and OH + ions to directly oxidize organic and reacted organics.
상기와 같은 e-는 수중산소와 반응해서 O2 -를 생성하고, O2 -는 ①과 같이 물분자와 반응해서 두 개의 OH radical과 두 개의 수산화이온 그리고 산소 한분자를 만들거나 ②와 같이 H+와 반응하여 HO를 만들고 결국은 H2O2를 생성하여 이 H2O2가 몇가지 반응경로를 거쳐 OH radical이 생성한다.E as described above - the O 2 reacts with water oxygen-generate and, O 2 - is ① reacts with water molecules as to make those two OH radical and two hydroxide ions and oxygen, one minutes, or H +, such as the ② the reaction creates a HO finally the OH radical to produce an H 2 O 2 is generated by the H 2 O 2 via several reaction routes.
상기 Organic은 냄새, 균, 오염물을 나타낸 것이다.The organic represents odors, bacteria, contaminants.
상기 광촉매 반응의 반응비는 일반적으로 물속보다는 공기중에서 더 크며, 공기중 반응의 양자수율은 물중 반응의 수율보다 약 39배 정도 더 큰 것으로 알려지고 있다.The reaction ratio of the photocatalytic reaction is generally larger in air than in water, and the quantum yield of the air reaction is known to be about 39 times larger than the yield of the reaction in water.
이상의 구성에 따라 방전선(5)에 전압이 인가되면 방전대응극(6)과의 사이에 코로나 방전이 균일한 분포로 발생되어 그 사이를 통과하는 먼지는 하전을 갖고 전리되는데, 금망(19)과 상기 전리부(A) 사이에는 전하를 차단하는 유전체망(18)이 설치되어 있어 방전이 금망(19)에 미치지 않는다.According to the above configuration, when a voltage is applied to the discharge line 5, the corona discharge is generated in a uniform distribution between the discharge counter electrode 6, and the dust passing therebetween is charged and ionized. Between the ionizing portion A and the dielectric network 18 to block the charge is provided so that the discharge does not reach the gold network 19.
따라서 금망(19)을 전리부(A)에 근접되게 설치할 수 있어 전체적으로 콤팩트하게 된다.Therefore, the gold screen 19 can be installed in close proximity to the ionizing portion A, thereby making the overall compact.
상기 전리된 먼지는 TiO2가 코팅된 유전체망(18)을 거치게 되는데, 이때 TiO2광촉매는 방전선(5)에서 발하는 자외선을 받아 상기 반응에서와 같은 탈취/살균 작용을 받게 되면서 통과되어 금망(19)에서 굵은 먼지는 걸러지고 이를 통과한 미세먼지는 포집부(B)에서 포집된다.The ionized dust is passed through the TiO 2 coated dielectric network 18, wherein the TiO 2 photocatalyst receives ultraviolet rays emitted from the discharge line 5 and undergoes the same deodorizing / sterilizing action as the reaction. In 19) coarse dust is filtered out and fine dust passing through it is collected in the collecting part (B).
이와 같이 본 발명은 집진필터의 조립간격이 짧아져 콤팩트함과 함께 광촉매 반응으로 포집부(B)에 도달되기 전의 미세먼지중의 미생물을 살균시키고 또한 탈취시키므로써 포집부(B)에서 포집되지 않고 외부로 배출되는 공기를 청정하게 할 수 있다.As described above, the present invention is shorter in the assembly interval of the dust collecting filter and is not collected in the collecting part B by sterilizing and deodorizing microorganisms in the fine dust before reaching the collecting part B by the photocatalytic reaction. The air discharged to the outside can be cleaned.
이상에서와 같이 본 발명은 전리부(A)와 금망(19) 사이에 TiO2가 코팅된 유전체망(18)을 구성시키므로써 방전선(5)과 금망(19)의 간격(b')을 짧게 유지할 수 있어 전체적으로 콤팩트화할 수 있음과 함께 광촉매의 작용으로 포집부(B)에 도달되기전의 미세먼지중에 내재하고 있는 미생물 살균 및 탈취로 신선한 공기를 외부로 배출시킬 수 있다.As described above, the present invention configures the dielectric network 18 coated with TiO 2 between the ionizing portion A and the gold mesh 19 to thereby form a gap b ′ between the discharge line 5 and the gold mesh 19. Since it can be kept short, it can be compactized as a whole and the fresh air can be discharged to the outside by microorganism sterilization and deodorization inherent in the fine dust before reaching the collecting part B by the action of the photocatalyst.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970039826A KR100249197B1 (en) | 1997-08-21 | 1997-08-21 | Electrical dust collector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970039826A KR100249197B1 (en) | 1997-08-21 | 1997-08-21 | Electrical dust collector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR19990017059A true KR19990017059A (en) | 1999-03-15 |
| KR100249197B1 KR100249197B1 (en) | 2000-03-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1019970039826A KR100249197B1 (en) | 1997-08-21 | 1997-08-21 | Electrical dust collector |
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| Country | Link |
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| KR (1) | KR100249197B1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100445778B1 (en) * | 2001-07-23 | 2004-08-25 | 주식회사 엔비오 | Photocatalyic deodorization filter for air cleaner using plastic optical fibers |
| KR100475863B1 (en) * | 2002-01-18 | 2005-03-15 | 학교법인연세대학교 | A high efficiency dust collector |
| KR20200144870A (en) | 2019-06-19 | 2020-12-30 | 김상은 | Resin composition having excellent antifungal and antibacterial properties |
| CN114484696A (en) * | 2022-01-26 | 2022-05-13 | 广州市科帮环境科技有限公司 | Air filtering method |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01231926A (en) * | 1988-03-14 | 1989-09-18 | Hitachi Ltd | Air cleaner |
| JPH034948A (en) * | 1989-05-30 | 1991-01-10 | Mitsubishi Electric Corp | Dust collecting/deodorizing filter for air purifier |
-
1997
- 1997-08-21 KR KR1019970039826A patent/KR100249197B1/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100445778B1 (en) * | 2001-07-23 | 2004-08-25 | 주식회사 엔비오 | Photocatalyic deodorization filter for air cleaner using plastic optical fibers |
| KR100475863B1 (en) * | 2002-01-18 | 2005-03-15 | 학교법인연세대학교 | A high efficiency dust collector |
| KR20200144870A (en) | 2019-06-19 | 2020-12-30 | 김상은 | Resin composition having excellent antifungal and antibacterial properties |
| CN114484696A (en) * | 2022-01-26 | 2022-05-13 | 广州市科帮环境科技有限公司 | Air filtering method |
Also Published As
| Publication number | Publication date |
|---|---|
| KR100249197B1 (en) | 2000-03-15 |
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