JP3781297B2 - Safety screen cleaning device for filter - Google Patents
Safety screen cleaning device for filter Download PDFInfo
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- JP3781297B2 JP3781297B2 JP2002234450A JP2002234450A JP3781297B2 JP 3781297 B2 JP3781297 B2 JP 3781297B2 JP 2002234450 A JP2002234450 A JP 2002234450A JP 2002234450 A JP2002234450 A JP 2002234450A JP 3781297 B2 JP3781297 B2 JP 3781297B2
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Description
【０００１】
【発明の属する技術分野】
この発明は、下水等の再生水ろ過時に、不快害虫の幼虫やろ材の摩耗クズが、処理水側へ流出するのを防止するろ過機におけるセイフティースクリーンの洗浄装置に関する。
【０００２】
【従来の技術】
従来、砂ろ過装置は周知であり、樹脂性ろ材や繊維ろ材等を用いて上向流で固液分離を行なうろ過装置もよく知られている。樹脂ろ材や繊維ろ材等を用いたろ過装置は、ろ材の比重が軽く、目詰まりしたろ材層が容易に撹拌でき、洗浄水も少ない利点がある。ろ過槽に上向流で供給した原水を、粒状の発泡ろ材のろ材層で固液分離を行ない、集水ノズルからろ液を取出して、目詰まりしたろ材層を撹拌機で洗浄撹拌してろ材を再生する装置は、例えば、特開平９−１５５１１６号公報に記載してあるように、この発明の出願人が提案している。また、ろ過槽上部にろ材流出防止用の止水スクリーンを設け、集水した分離水側にスクリーンを設け、混入するユスリカの幼虫等を除去する装置も、例えば、特開２００２−１１３０５号公報に記載してあるように、この発明の出願人が提案している。
【０００３】
【発明が解決しようとする課題】
従来、動物プランクトンやユスリカの幼虫等の生物体は、ろ材層中を動くことにより、捕捉粒子径よりも大きいにもかかわらず、集水ノズルを通り抜け集水室に流入し、下水等の再生水ろ過時に、ユスリカ等の不快害虫の幼虫や樹脂性ろ材の摩耗クズが処理水側に流入していた。その対策として、細目のスクリーンを配設したろ過機にあっては、不快害虫の幼虫やろ材の摩耗クズの除去ができるものであるが、ろ過運転を停止してスクリーンに配設した洗浄管から洗浄水を噴射して、スクリーンの目詰まりを解消する必要があった。この発明は、上記のろ過装置を改良したもので、ろ過を中断することなく、セイフティースクリーンを自動的に洗浄できる洗浄装置を提供することを目的とする。
【０００４】
【課題を解決するための手段】
この発明の要旨は、密閉状のろ過槽の底部から供給した原水を、ろ材層で固液分離を行なって、ろ過槽の頂部からろ液を取出すろ過装置において、前記ろ過槽の頂部に集水ノズ ルを設け、その内部を集水室とし、前記集水室の上部に配設した処理水室の底部開口に、円筒状のスクリーンを回転自在に吊設して、スクリーンのろ過面を集水室に垂下させると共に、集水室に挿入した吸込管の集水口をスクリーンの外周面に対設したもので、ろ過室を広くとることができると共に、集水室に流入してきたユスリカ等の不快害虫の幼虫や樹脂性ろ材の摩耗クズを回転しているスクリーンで捕捉して、ろ過運転を継続しながら、吸込管の集水口から不快害虫の幼虫や摩耗クズを排出させることができる。
【０００５】
不快害虫の幼虫やろ材の摩耗クズを捕捉するスクリーンは、保護金網に支持された金属ろ材を、パンチングメタルで挟持して、パンチングメタルの目開きを集水室側を処理水室側より小さくしたもので、補強したスクリーンに処理水室の背圧を受け易くしたものである。処理水室の上部に支架した駆動機の回転軸をスクリーンの底部に連結して、スクリーンを回転自在としたもので、処理水室の背圧を利用して処理水の一部を吸込管に流入させて、不快害虫の幼虫や摩耗クズを排出することができる。スクリーン前後に差圧が取れない時には、吸込管に連結した逆洗水排水管にラインポンプを配設すれば、不快害虫の幼虫や摩耗クズを吸引して排出することができる。
【０００６】
【発明の実施の形態】
この発明に係る装置は上記のように構成してあり、ろ過槽の槽底から供給した原水は、原水中に含まれる微細粒子をろ過層で捕捉させ、分離したろ液をろ過槽上部の集水室に流入させる。分離水とともに集水室に流入してきたユスリカ等の不快害虫の幼虫や樹脂性ろ材の摩耗クズをスクリーンで捕捉して、スクリーンから処理水室に流入させて、ろ過槽より処理水を排出する。スクリーンが捕捉した不快害虫の幼虫や摩耗クズで目詰まりした時には、ろ過運転を継続しながら、処理水側に背圧をかけると同時に、洗浄弁を開き大気解放すれば、ろ過された処理水の一部でスクリーンの洗浄が行なわれる。不快害虫の幼虫や摩耗クズが処理水とともに集水口から吸込管に流入し、洗浄水排水管から排出される。なお、配置上スクリーンの前後の差圧が取れない場合は、ラインポンプで吸引する。ろ材層が目詰まりしたときには、撹拌羽根や空気撹拌等でろ材層を撹拌すれば、ろ材層から分離された微細粒子を洗浄排水とともにろ過槽外に抜き出すことができる。所定時間後にろ過操作を開始すれば、再生されたろ材層から清澄なろ液を取出すことができる。
【０００７】
【実施例】
この発明を図面に基づき詳述すると、図１はろ過槽上部に設けたセイフティースクリーンの洗浄装置であって、密閉状のろ過槽１に樹脂性の粒状の発泡ろ材や繊維ろ材等が収納してある。ろ過槽１の頂部に集水ノズル２が設けてあり、集水ノズル２の開口はろ材が流出しない程度の大きさとしてある。ろ過槽１に上向流で原水を供給して、ろ過槽１の上部にろ材を浮上させてろ材層３を形成させて、原水中に含まれる微細粒子をろ材層３に捕捉させ、分離されたろ液を集水ノズル２の内部の集水室４に移送する。動物プランクトンやユスリカの幼虫等の生物体は、ろ材層３中を動くことにより、捕捉粒子径よりも大きいにもかかわらず、集水ノズル２を通り抜ける。また、目詰まりしたろ材層３を機械撹拌あるいは空気撹拌した時に、ろ材の摩耗クズが発生し、比重の軽いろ材クズが集水室に流入する。なお、集水室４はろ過槽１の上部に集水スクリーンを張設して、その上方を集水室としてもよいものである。また、ろ材層３は比重の大きい砂やアンスラサイトとしてもよいものである。
【０００８】
図１に示すように、ろ過槽１の頂部に配設した集水ノズル２の上部に処理水室５が配設してあり、処理水室５の底部の開口に周面をろ過面としたスクリーン６が回転可能に吊設してある。このスクリーン６は上部を処理水室５に解放して、底部を閉止してある。ろ液とともに集水室４に流入してきた不快害虫の幼虫や樹脂性ろ材の摩耗クズをスクリーン５で捕捉して、分離された処理水だけをスクリーン６の上部の処理水室５に流出させ、処理水室５に設けた処理水管７からろ過槽１外に処理水を抜出す。なお、符号８は処理水室５の底部の開口とスクリーン６の上端部の間に設けたメカニカルシールである。
【０００９】
処理水室５の上部に支架した駆動機９の回転軸１０がスクリーン６の底部に連結してあり、駆動機９でスクリーン６を回転可能としてある。集水ノズル２に吸込管１１が挿入してあり、吸込管１１の集水口１２が回転自在としたスクリーン６の外周面に対設してある。吸込管１１に洗浄弁１３を介して逆洗水排水管１４が連結してあり、逆洗水排水管１４をろ過槽１の下方に垂下してある。図２に示すように、スクリーン６は保護金網１５に支持された金属ろ材１６がパンチングメタル１７、１８で挟持してあり、集水ノズル２側のパンチングメタル１７の目開きを処理水室５側のパンチングメタル１８の目開きよりも小さくしてある。処理水室５から集水室４への背圧を受けやすくしてある。
【００１０】
スクリーン６が目詰まりした時には、ろ過運転を継続しながら、駆動機９でスクリーン６を回転させ、処理水室５に背圧をかけると同時に洗浄弁１３を開き大気解放する。処理水室６側の背圧と逆洗水排水管１４のサイホン作用により、処理水の一部が処理水室５から吸込管１１の集水口１２に吸引されて、スクリーン６で捕捉したＳＳ、ろ材クズ及び不快害虫の幼虫が集水口１２から吸込管１１に流入する。洗い流された不快害虫の幼虫等は洗浄水排水管１４から排出され、スクリーン６の目詰まり物が取除かれる。なお、配置上スクリーン６の前後の差圧が取れない場合は、逆洗水排水管１４の後段にラインポンプ１９を配設して、このラインポンプ１９で吸引すれば、スクリーン６の目詰まりが解消できる。そして、ろ材層３が目詰まりしたときには、撹拌羽根（図示せず）等でろ材層３を空気撹拌または機械撹拌すれば、ろ材層３から分離された微細粒子を洗浄排水とともにろ過槽１外に排出できる。
【００１１】
【発明の効果】
以上のように、この発明に係るろ過機におけるセイフティースクリーンの洗浄装置は、不快害虫の幼虫やろ材の摩耗クズが、処理水側へ流出するのを防止して、目詰まりするスクリーンをろ過を中断することなく洗浄することができる。即ち、従来のろ過装置では、処理水側に流入したユスリカ等の不快害虫の幼虫やろ材の摩耗クズは、細目のスクリーンを配設して捕捉し、ろ過運転を停止してスクリーンを洗浄する必要があったものであるが、この発明にあっては、ろ液の集水室の上部に配設した処理水室の底部開口に、周面をろ過面としたスクリーンを回転自在に吊設して集水室に垂下させ、集水室に挿入した吸込管の集水口をスクリーンの外周面に対設したもので、ろ液の集水室に流入してきたユスリカ等の不快害虫の幼虫や樹脂性ろ材の摩耗クズをスクリーンで捕捉して、ろ過運転を継続しながら分離水の一部を逆流させて、吸込管の集水口から不快害虫の幼虫等を排出することができる。
【００１２】
ろ過槽の頂部に集水ノズルを設け、その内部を集水室とすれば、ろ過室を広く取ることができる。スクリーンが、保護金網に支持された金属ろ材を、パンチングメタルで挟持して、パンチングメタルの目開きを集水室側を処理水室側より小さくしたもので、補強したスクリーンに処理水室の背圧を受け易くなるものである。処理水室の上部に支架した駆動機の回転軸をスクリーンの底部に連結して、スクリーンを回転自在としたもので、処理水側の背圧で吸込短管から不快害虫の幼虫や摩耗クズを排出することができる。スクリーンの前後に差圧が取れない時には、吸込管に連結した逆洗水排水管にラインポンプを配設すれば、不快害虫の幼虫や摩耗クズを排出することができる。
【図面の簡単な説明】
【図１】 この発明に係るろ過機におけるセイフティースクリーンの洗浄装置の縦断面図である。
【図２】 同じく、要部のスクリーンの縦断面図である。
【符号の説明】
１ ろ過槽
２ 集水ノズル
３ ろ材層
４ 集水室
５ 処理水室
６ スクリーン
９ 駆動機
１０ 回転軸
１１ 吸込管
１２ 集水口
１４ 逆洗水排水管
１５ 保護金網
１６ 金属ろ材
１７、１８ パンチングメタル
１９ ラインポンプ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a safety screen cleaning device in a filter that prevents unpleasant pest larvae and filter media wear debris from flowing out to treated water during filtration of reclaimed water such as sewage.
[0002]
[Prior art]
Conventionally, sand filtration apparatuses are well known, and filtration apparatuses that perform solid-liquid separation in an upward flow using a resinous filter medium, a fiber filter medium, or the like are also well known. A filtration apparatus using a resin filter medium, a fiber filter medium, or the like has an advantage that the specific gravity of the filter medium is light, the clogged filter medium layer can be easily stirred, and there is little washing water. The raw water supplied in the upward flow to the filtration tank is separated into solid and liquid using the granular foam filter medium layer, the filtrate is taken out from the water collection nozzle, and the clogged filter medium layer is washed and stirred with a stirrer. An apparatus for reproducing the image has been proposed by the applicant of the present invention as described in, for example, Japanese Patent Laid-Open No. 9-155116. Also, an apparatus for providing a water stopping screen for preventing the outflow of filter media at the upper part of the filtration tank, providing a screen on the collected separated water side, and removing mixed chironomid larvae is disclosed in, for example, Japanese Patent Application Laid-Open No. 2002-11305. As stated, the applicant of the present invention has proposed.
[0003]
[Problems to be solved by the invention]
Conventionally, living organisms such as zooplankton and chironomid larvae move through the filter medium layer and flow into the water collection chamber through the water collection nozzle even though it is larger than the trapped particle diameter, and filter the reclaimed water such as sewage. Occasionally larvae of unpleasant pests such as chironomid and wear debris from resinous filter media flowed into the treated water side. As a countermeasure, a filter equipped with a fine screen can remove unpleasant insect larvae and abrasion debris from the filter medium. It was necessary to eliminate clogging of the screen by spraying cleaning water. The present invention is an improvement of the above-described filtration device, and an object thereof is to provide a washing device that can automatically wash the safety screen without interrupting the filtration.
[0004]
[Means for Solving the Problems]
The gist of the present invention is that the raw water supplied from the bottom of the sealed filtration tank is subjected to solid-liquid separation in the filter medium layer, and the filtrate is taken out from the top of the filtration tank, and water is collected at the top of the filtration tank. the nozzle provided, and its internal and water collecting chamber, the the bottom opening of the processing water chamber which is disposed above the water collecting chamber, and suspended freely rotating cylindrical screen, collecting the filtration surface of the screen In addition to hanging down in the water chamber, the suction port of the suction pipe inserted in the water collection chamber is placed on the outer peripheral surface of the screen, so that the filtration chamber can be made wide and the chironomid etc. that flowed into the water collection chamber Unpleasant pest larvae and resinous filter media wear debris are captured by a rotating screen, and the unpleasant pest larvae and wear debris can be discharged from the water collecting port of the suction pipe while continuing the filtration operation.
[0005]
The screen for catching unpleasant insect larvae and filter debris wears a metal filter supported by a protective wire mesh with punching metal, making the opening of the punching metal smaller on the water collection chamber side than on the treatment water chamber side. The reinforced screen makes it easy to receive the back pressure of the treatment water chamber. The rotating shaft of the drive unit supported on the upper part of the treatment water chamber is connected to the bottom of the screen to make the screen rotatable. A part of the treatment water is drawn into the suction pipe using the back pressure of the treatment water chamber. It can be discharged to discharge nuisance pests and wear debris. When a differential pressure cannot be obtained across the screen, a line pump can be provided in the backwash water drain pipe connected to the suction pipe to suck and discharge unpleasant pest larvae and abrasion debris.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The apparatus according to the present invention is configured as described above, and the raw water supplied from the bottom of the filtration tank captures fine particles contained in the raw water with a filtration layer, and collects the separated filtrate at the upper part of the filtration tank. Let it flow into the water chamber. The screen captures unpleasant insect larvae such as chironomids and wear debris of resinous filter media that have flowed into the water collection chamber along with the separated water, flows into the treated water chamber from the screen, and discharges the treated water from the filtration tank. If the screen is clogged with trapped unpleasant insect larvae or abrasion debris, it continues filtration and applies back pressure to the treated water side. Some screens are cleaned. Unpleasant pest larvae and abrasion debris flow into the suction pipe from the water collection port together with the treated water, and are discharged from the washing water drain pipe. If the differential pressure across the screen cannot be taken due to the arrangement, suction is performed with a line pump. When the filter medium layer is clogged, the fine particles separated from the filter medium layer can be extracted out of the filtration tank together with the washing waste water by stirring the filter medium layer with a stirring blade or air stirring. If the filtration operation is started after a predetermined time, a clear filtrate can be taken out from the regenerated filter medium layer.
[0007]
【Example】
The present invention will be described in detail with reference to the drawings. FIG. 1 shows a safety screen cleaning device provided at the upper part of a filtration tank, in which a resinous granular foam filter material, fiber filter medium, etc. are stored in a sealed filter tank 1. It is. A water collection nozzle 2 is provided at the top of the filtration tank 1, and the opening of the water collection nozzle 2 is sized so that the filter medium does not flow out. The raw water is supplied to the filtration tank 1 in an upward flow, the filter medium is floated on the upper part of the filtration tank 1 to form the filter medium layer 3, and the fine particles contained in the raw water are captured and separated by the filter medium layer 3. The filtrate is transferred to the water collection chamber 4 inside the water collection nozzle 2. Living organisms such as zooplankton and chironomid larvae move through the water collection nozzle 2 even though they are larger than the trapped particle diameter by moving in the filter medium layer 3. Further, when the clogged filter medium layer 3 is mechanically stirred or air-stirred, filter medium wear debris is generated and filter medium debris having a low specific gravity flows into the water collecting chamber. In addition, the water collection chamber 4 is good also as a water collection chamber in the upper part of the filtration tank 1 by extending a water collection screen. The filter medium layer 3 may be sand or anthracite having a large specific gravity.
[0008]
As shown in FIG. 1, a treated water chamber 5 is disposed at the top of a water collection nozzle 2 disposed at the top of the filtration tank 1, and the peripheral surface is used as a filtration surface at the opening at the bottom of the treated water chamber 5. A screen 6 is suspended so as to be rotatable. The screen 6 is open at the top to the treated water chamber 5 and closed at the bottom. The screen 5 captures unpleasant pest larvae that have flowed into the water collecting chamber 4 together with the filtrate, and wear debris of the resinous filter medium, and causes only the separated treated water to flow out into the treated water chamber 5 above the screen 6. The treated water is drawn out of the filtration tank 1 from the treated water pipe 7 provided in the treated water chamber 5.
[0009]
A rotating shaft 10 of a driving machine 9 supported on the upper part of the treated water chamber 5 is connected to the bottom of the screen 6 so that the driving machine 9 can rotate the screen 6. A suction pipe 11 is inserted into the water collection nozzle 2, and a water collection port 12 of the suction pipe 11 is provided on the outer peripheral surface of the screen 6 that is rotatable. A backwash water drain pipe 14 is connected to the suction pipe 11 via a wash valve 13, and the back wash water drain pipe 14 is suspended below the filtration tank 1. As shown in FIG. 2, the screen 6 has a metal filter medium 16 supported by a protective metal mesh 15 sandwiched between punching metals 17 and 18, and the opening of the punching metal 17 on the side of the water collecting nozzle 2 is arranged on the treated water chamber 5 side. It is made smaller than the opening of the punching metal 18. The back pressure from the treated water chamber 5 to the water collecting chamber 4 is easily received.
[0010]
When the screen 6 is clogged, while continuing the filtration operation, the screen 6 is rotated by the drive unit 9 to apply back pressure to the treated water chamber 5, and at the same time, the cleaning valve 13 is opened to release the atmosphere. Due to the back pressure on the treated water chamber 6 side and the siphon action of the backwash water drain pipe 14, a portion of the treated water is sucked from the treated water chamber 5 into the water collecting port 12 of the suction pipe 11 and captured by the screen 6. Filter medium waste and larvae of unpleasant pests flow into the suction pipe 11 from the water collection port 12. The washed away unpleasant insect larvae and the like are discharged from the washing water drain pipe 14, and the clogging of the screen 6 is removed. If the differential pressure across the screen 6 cannot be taken due to the arrangement, the line pump 19 is disposed at the rear stage of the backwash water drain pipe 14 and sucked by the line pump 19 so that the screen 6 is clogged. Can be resolved. And when the filter medium layer 3 is clogged, if the filter medium layer 3 is air-stirred or mechanically stirred with a stirring blade (not shown) or the like, the fine particles separated from the filter medium layer 3 are washed out of the filtration tank 1 together with the washing waste water. Can be discharged.
[0011]
【The invention's effect】
As described above, the safety screen cleaning device in the filter according to the present invention prevents unpleasant pest larvae and filter media wear debris from flowing out to the treated water side, and filters clogged screens. It can be cleaned without interruption. That is, in the conventional filtration device, it is necessary to dispose unpleasant larvae such as chironomid larvae and filter media wear debris that flow into the treated water side by installing a fine screen and stop the filtration operation to clean the screen. However, according to the present invention, a screen having a peripheral surface as a filtration surface is rotatably suspended at the bottom opening of the treatment water chamber disposed above the filtrate water collection chamber. The suction port of the suction pipe inserted into the water collection chamber is placed on the outer peripheral surface of the screen, and the larvae and resin of chironomid and other unpleasant pests that flow into the water collection chamber It is possible to capture the wear debris of the filter medium with a screen and to reverse a part of the separated water while continuing the filtration operation, thereby discharging unpleasant larvae and the like from the water collecting port of the suction pipe.
[0012]
If a water collection nozzle is provided at the top of the filtration tank and the inside is used as a water collection chamber, the filtration chamber can be widened. The screen is made by sandwiching a metal filter supported by a protective wire mesh with punching metal and opening the punching metal so that the water collection chamber side is smaller than the treatment water chamber side. It becomes easy to receive pressure. The rotating shaft of the drive unit supported on the upper part of the treatment water chamber is connected to the bottom of the screen so that the screen can rotate freely. The back pressure on the treated water side removes harmful insect pests and wear debris from the suction short pipe. Can be discharged. When differential pressure cannot be taken across the screen, larvae and wear debris of unpleasant pests can be discharged by arranging a line pump in the backwash water drain pipe connected to the suction pipe.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a safety screen cleaning device in a filter according to the present invention.
FIG. 2 is also a longitudinal sectional view of the main screen.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Filtration tank 2 Water collection nozzle 3 Filter material layer 4 Water collection chamber 5 Treated water chamber 6 Screen 9 Drive machine 10 Rotating shaft 11 Suction pipe 12 Water collection port 14 Backwash water drain pipe 15 Protective metal mesh 16 Metal filter medium 17, 18 Punching metal 19 Line pump
Claims (4)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002234450A JP3781297B2 (en) | 2002-08-12 | 2002-08-12 | Safety screen cleaning device for filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002234450A JP3781297B2 (en) | 2002-08-12 | 2002-08-12 | Safety screen cleaning device for filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2004073920A JP2004073920A (en) | 2004-03-11 |
| JP3781297B2 true JP3781297B2 (en) | 2006-05-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002234450A Expired - Fee Related JP3781297B2 (en) | 2002-08-12 | 2002-08-12 | Safety screen cleaning device for filter |
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| Country | Link |
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| JP (1) | JP3781297B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104436808A (en) * | 2014-11-28 | 2015-03-25 | 黑龙江大学 | Full-automatic water purifying and filtering device with self-cleaning function and filtering method |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100884825B1 (en) | 2007-12-04 | 2009-02-23 | (주)휠탑 | Water treatment method and the apparatus using horizontal purify |
| JP2015062864A (en) * | 2013-09-25 | 2015-04-09 | 三浦工業株式会社 | Ballast water treatment apparatus |
| KR102020716B1 (en) * | 2017-11-21 | 2019-09-10 | 강수동 | Liquid Contamination Purifier |
| CN108568153A (en) * | 2018-04-16 | 2018-09-25 | 南京汇康玻璃制品有限公司 | A kind of glass printing ink rapid filtering device |
| WO2024150470A1 (en) * | 2023-01-12 | 2024-07-18 | メタウォーター株式会社 | Separation device and method for controlling separation device |
-
2002
- 2002-08-12 JP JP2002234450A patent/JP3781297B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104436808A (en) * | 2014-11-28 | 2015-03-25 | 黑龙江大学 | Full-automatic water purifying and filtering device with self-cleaning function and filtering method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2004073920A (en) | 2004-03-11 |
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