JP2824207B2 - Control device of filtration process in sake brewing system - Google Patents
Control device of filtration process in sake brewing systemInfo
- Publication number
- JP2824207B2 JP2824207B2 JP6974994A JP6974994A JP2824207B2 JP 2824207 B2 JP2824207 B2 JP 2824207B2 JP 6974994 A JP6974994 A JP 6974994A JP 6974994 A JP6974994 A JP 6974994A JP 2824207 B2 JP2824207 B2 JP 2824207B2
- Authority
- JP
- Japan
- Prior art keywords
- filter
- valve
- inlet
- filtration
- side disconnection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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- Alcoholic Beverages (AREA)
- Filtration Of Liquid (AREA)
Description
【0001】[0001]
【産業上の利用分野】本発明は、清酒醸造システムにお
ける濾過工程の制御装置、特に濾過終了後の濾過機切り
離し作業の自動化に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a filtration process in a sake brewing system, and more particularly to an automatic operation for separating a filter after the filtration is completed.
【0002】[0002]
【従来の技術】清酒の醸造過程において、上槽(圧搾)
工程の後、濾過工程がある。この工程は、圧搾工程で醪
を搾った直後の生酒を濾過する工程であり、具体的に
は、図3に示すように、搾った直後の生酒を貯留するタ
ンク(入口タンク)1に活性炭を投入し、攪拌・静置し
た後、その活性炭を濾過し除去することで清澄な酒を作
る作業である。2. Description of the Related Art In the sake brewing process, an upper tank (pressing) is used.
After the step, there is a filtration step. This step is a step of filtering the raw liquor immediately after squeezing the mash in the pressing step. Specifically, as shown in FIG. 3, activated carbon is stored in a tank (inlet tank) 1 for storing the raw liquor immediately after squeezing. After charging, stirring and standing, the activated carbon is filtered and removed to make clear sake.
【0003】通常、濾過時間の短縮を目的として、ま
ず、入口タンク1に払い出し口として設けられている上
呑み2、下呑み3のうち、上方の上呑み2からタンク1
上層部の比較的清澄な酒を引き出して濾過し、次いで下
呑み3から、タンク1下層部の活性炭が沈澱して濃厚と
なった部分を引き出して濾過する方法が取られる。Usually, for the purpose of shortening the filtration time, first, among the upper swallow 2 and the lower swallow 3 provided as a discharge port in the inlet tank 1, the upper swab 2 and the upper
A method is adopted in which the relatively clear sake in the upper layer is drawn out and filtered, and then the thickened portion of activated carbon in the lower layer of the tank 1 is drawn out from the lower bowl 3 and filtered.
【0004】具体的には、上呑み2又は下呑み3からの
生酒は、払い出し配管4、濾過送りポンプ5及び供給配
管6から成る1次移送配管系を通して濾過機7へ送ら
れ、該濾過機を経て清澄な酒となり、2次移送配管系を
構成する移送配管8より図示してない澄口タンクへと移
される。[0004] Specifically, the sake from the upper swallow 2 or the lower swallow 3 is sent to a filter 7 through a primary transfer pipe system including a discharge pipe 4, a filtration feed pump 5 and a supply pipe 6, and the filter 7 Through the transfer pipe 8 constituting the secondary transfer pipe system to a clear tank (not shown).
【0005】更に、この濾過の終了に続いて水押しを行
なった後に、濾過機7内に捕捉した活性炭を圧縮空気を
使って脱水、乾燥する作業を行なうことを目的として、
濾過・水押しを連続して行なうことは勿論、濾過機7内
の圧力を保持させたままの状態で、濾過機7を濾過送り
ポンプ5から切り離す必要がある。この濾過機7の切り
離し作業においては、濾過機7の圧力を急激に変化させ
ることなく、濾過機7への入口側切り離し弁a及び出口
側切り離し弁bを同時に閉じなければならない。[0005] Further, after water is pressed following the end of the filtration, the activated carbon captured in the filter 7 is dewatered and dried using compressed air.
It is necessary to disconnect the filter 7 from the filtration feed pump 5 while maintaining the pressure inside the filter 7 as well as performing the filtration and water pushing continuously. In the separating operation of the filter 7, the inlet-side disconnection valve a and the outlet-side disconnection valve b to the filter 7 must be closed at the same time without rapidly changing the pressure of the filter 7.
【0006】[0006]
【発明が解決しようとする課題】しかしながら、従来
は、濾過機7の切り離し作業を、蔵人(作業員)の手作
業によっていたため、切り離しのための弁類操作のタイ
ミングに熟練を要し、失敗すれば濾過機7内部の濾層が
剥離・脱落し、脱水・乾燥が困難となるなどの問題があ
った。However, conventionally, since the separating operation of the filter 7 is manually performed by a brewer (operator), the timing of the operation of the valves for the separating operation is required to be skillful, and the operation is unsuccessful. Then, there is a problem that the filter layer inside the filter 7 peels off and falls off, making dehydration and drying difficult.
【0007】そこで、本発明の目的は、上記課題を解決
し、濾過終了後における濾過機の切り離し作業を、切り
換え遅れによる濾層崩壊の危険なしに、自動的に行うこ
とが可能な清酒醸造システムにおける濾過工程の制御装
置を提供することにある。Accordingly, an object of the present invention is to provide a sake brewing system capable of solving the above-mentioned problems and automatically performing the operation of disconnecting the filter after the filtration without danger of filter layer collapse due to switching delay. And a control device for the filtration step.
【0008】[0008]
【課題を解決するための手段】上記目的を達成するた
め、本発明の清酒醸造システムにおける濾過工程の制御
装置は、濾過機への1次移送配管系における入口側切り
離し弁の上流側と濾過機からの2次配管系における出口
側切り離し弁の下流側との間にバルブ付きバイパス配管
を設けると共に、入口側切り離し弁の近傍の配管に圧力
センサを設け、濾過機への酒類または押し水の供給を停
止するときは、圧力センサによる圧力表示が急激な変動
を起こさない程度に、バイパス配管のバルブの開放、濾
過機への入口側切り離し弁及び出口側切り離し弁の閉止
めを同時に進行させる構成のものである。In order to achieve the above object, a control apparatus for a filtration step in a sake brewing system according to the present invention comprises: a filter upstream of an inlet-side disconnection valve in a primary transfer piping system to a filter; Supply of liquor or pressurized water to a filter, by providing a bypass pipe with a valve between the outlet pipe and the downstream side of the outlet cutoff valve in the secondary pipe system, and a pressure sensor in the pipe near the inlet cutoff valve When stopping the operation, the opening of the valve of the bypass pipe and the closing of the inlet-side disconnection valve and the outlet-side disconnection valve to the filter are simultaneously advanced to the extent that the pressure display by the pressure sensor does not suddenly fluctuate. Things.
【0009】また、前記清酒醸造システムが濾過送りポ
ンプを備え、前記濾過機への酒類または押し水の供給を
停止するときは、前記圧力センサによる圧力表示が急激
な変動を起こさない程度に上記濾過送りポンプをスピー
ドコントロールしつつ、前記バイパス配管の前記バルブ
の開放、上記濾過機への前記入口側切り離し弁及び出口
側切り離し弁の閉止めを同時に進行させる構成のもので
ある。Further, the sake brewing system includes a filtration feed pump, and when the supply of liquor or pressed water to the filter is stopped, the filtration is performed to such an extent that the pressure display by the pressure sensor does not suddenly fluctuate. While the speed of the feed pump is controlled, the opening of the valve of the bypass pipe and the closing of the inlet-side disconnection valve and the outlet-side disconnection valve to the filter are simultaneously advanced.
【0010】[0010]
【作用】濾過機への酒類または押し水の供給を停止する
際、バイパス配管のバルブの開放、濾過機の入口側切り
離し弁及び出口側切り離し弁の閉止めが同時に進行され
るため、濾過機内圧力の急激な変動を阻止しつつ、自動
的に濾過機を移送配管系から切り離すことができる。When the supply of liquor or pressurized water to the filter is stopped, the opening of the bypass pipe valve and the closing of the inlet-side disconnection valve and the outlet-side disconnection valve of the filter are simultaneously advanced. The filter can be automatically disconnected from the transfer piping system while preventing rapid fluctuation of the filter.
【0011】また濾過送りポンプも制御に組み込むこと
ができて、この濾過送りポンプのスピードコントロール
下で、バイパス配管のバルブの開放、濾過機の入口側切
り離し弁及び出口側切り離し弁の閉止めを同時に進行さ
せれば、濾過機内圧力の急激な変動を確実に阻止しつ
つ、自動的に濾過機を移送配管系から切り離すことがで
きる。A filter feed pump can also be incorporated in the control. Under the speed control of the filter feed pump, the opening of the valve of the bypass pipe and the closing of the inlet side cutoff valve and the outlet side cutoff valve of the filter are simultaneously performed. By proceeding, the filter can be automatically disconnected from the transfer piping system while reliably preventing a rapid change in the pressure inside the filter.
【0012】[0012]
【実施例】以下、本発明の一実施例を添付図面に基づい
て説明する。図1において、基本的構成は図3と同様で
あるので、同一構成要素には同じ符号を付して説明を省
略する。An embodiment of the present invention will be described below with reference to the accompanying drawings. In FIG. 1, since the basic configuration is the same as that of FIG. 3, the same components are denoted by the same reference numerals and description thereof will be omitted.
【0013】図3の場合と異なり、濾過機7への1次移
送配管系における供給配管6の濾過機7入口付近には自
動切り換え弁から成る切り離し用の入口側切り離し弁9
が、また2次移送配管系における出口側配管8の濾過機
7出口付近には、自動切り換え弁から成る切り離し用の
出口側切り離し弁10が設けられている。そして、供給
配管6における入口側切り離し弁9より濾過機7入口側
には、濾過機7内の圧力を検知するための圧力センサ1
1と、圧力計12とが設けられている。Unlike the case of FIG. 3, the supply pipe 6 in the primary transfer piping system to the filter 7 is provided near the inlet of the filter 7 at the inlet of the filter 7, and is provided with an inlet-side disconnection valve 9 for disconnection.
However, in the secondary transfer piping system, near the outlet of the filter 7 in the outlet pipe 8, there is provided an outlet-side disconnection valve 10 for disconnection composed of an automatic switching valve. A pressure sensor 1 for detecting the pressure in the filter 7 is provided on the inlet side of the filter 7 from the inlet-side disconnection valve 9 in the supply pipe 6.
1 and a pressure gauge 12 are provided.
【0014】また、この入口側切り離し弁9の上流側と
出口側切り離し弁10の下流側において、供給配管6と
出口側配管8との間には、自動切り換え弁から成るバイ
パスバルブ13を具備するバイパス配管14が設けら
れ、これにより濾過機7がバイパスされて配管系から切
り離され、1次移送配管系から2次移送配管系へ生酒が
直接に移行しうるようになっている。A bypass valve 13 comprising an automatic switching valve is provided between the supply pipe 6 and the outlet pipe 8 on the upstream side of the inlet-side disconnection valve 9 and on the downstream side of the outlet-side disconnection valve 10. A bypass pipe 14 is provided, whereby the filter 7 is bypassed and separated from the pipe system, so that sake can be directly transferred from the primary transfer pipe system to the secondary transfer pipe system.
【0015】更に出口側配管8の先は、清澄な酒を移送
する配管15と排水のための配管16とに分岐してお
り、それぞれの配管15,16中に、送り切り換え弁1
7、18が設けられている。Further, the end of the outlet side pipe 8 is branched into a pipe 15 for transferring clear sake and a pipe 16 for drainage, and the feed switching valve 1 is provided in each of the pipes 15 and 16.
7, 18 are provided.
【0016】19は上記弁9、10、13、17、18
の開閉操作手順とタイミングを司るプログラマブルコン
トローラ(いわゆるシーケンサ)、20はこのシーケン
サ19の制御と濾過送りポンプ5のスピードコントロー
ルとを行って、濾過機7の切り離し作業の自動化を図る
コントローラであり、両者は共に制御装置の構成要素と
なる。Reference numeral 19 denotes the valves 9, 10, 13, 17, 18
A programmable controller (so-called sequencer) 20 controls the opening and closing operation procedure and timing of the filter. The controller 20 controls the sequencer 19 and controls the speed of the filtration feed pump 5 so as to automate the separating operation of the filter 7. Are both components of the control device.
【0017】さて、醪を圧搾工程で絞った後、その生酒
を濾過する濾過工程では、入口タンク1に活性炭を投入
し、攪拌・静置した後、活性炭を濾過・除去して清澄な
酒とする。In the filtration step of filtering the raw sake after squeezing the mash in the pressing step, activated carbon is put into the inlet tank 1, stirred and allowed to stand, and then the activated carbon is filtered and removed to obtain a clear sake. I do.
【0018】まずコントローラ20の制御の下で、シー
ケンサ19が、図2(a)に示すように、入口側切り離
し弁9及び出口側切り離し弁10を開状態、バイパスバ
ルブ13を閉状態で、濾過送りポンプ5を運転し、濾過
作業が行われる。このときコントローラ20は、圧力セ
ンサ11で検出される濾過機7の圧力変動に応じて濾過
送りポンプ5のスピードコントロールを行なうことによ
り、予め設定した濾過の最適圧力を保持するように調整
する。First, under the control of the controller 20, as shown in FIG. 2A, the sequencer 19 opens the inlet-side disconnection valve 9 and the outlet-side disconnection valve 10, opens the bypass valve 13 and closes the filter. The feed pump 5 is operated to perform a filtering operation. At this time, the controller 20 performs speed control of the filtration feed pump 5 in accordance with the pressure fluctuation of the filter 7 detected by the pressure sensor 11, thereby adjusting so as to maintain a preset optimum pressure for filtration.
【0019】次に、清澄な酒の送りが終了すると濾過後
の水押し工程に入り、シーケンサ19により切り換え弁
17が閉じられ、代わって切り換え弁18が開かれる。
これによって清澄な酒の送り工程から濾過後の水押し工
程へと連続的に切り替えられる。Next, when the feeding of the clear liquor is completed, a water pushing step after filtration is started, and the switching valve 17 is closed by the sequencer 19, and the switching valve 18 is opened instead.
As a result, the process is continuously switched from the step of feeding clear sake to the step of pushing water after filtration.
【0020】酒濾過の終了後の水押し工程では、濾過機
7の切り離し弁9、10は共に開状態、バイパスバルブ
13は閉状態になっている。濾過機7の切り離しは、押
し水が終了したのち排水の濾過が不要となったタイミン
グで実施する。即ち、図2(b)に示したように、濾過
機7の出口側切り離し弁10を徐々に閉じながら、タイ
ムラグを持たせて、入口側切り離し弁9の閉動作とバイ
パス弁13の開動作を行なわせる。この切り離し弁9、
10及びバイパスバルブ13の切換中も、濾過中と同様
に濾過機7内の圧力が一定になるよう、コントローラ2
0により濾過送りポンプ5のスピードコントロールを行
なう。In the water pushing step after the completion of the sake filtration, the disconnection valves 9 and 10 of the filter 7 are both open and the bypass valve 13 is closed. The separation of the filter 7 is performed at a timing when the drainage becomes unnecessary after the end of the pushing water. That is, as shown in FIG. 2 (b), while gradually closing the outlet-side disconnection valve 10 of the filter 7 with a time lag, the closing operation of the inlet-side disconnection valve 9 and the opening operation of the bypass valve 13 are performed. Let them do it. This disconnect valve 9,
During switching of the bypass valve 10 and the bypass valve 13, the controller 2 is controlled so that the pressure in the filter 7 becomes constant as during filtration.
0 controls the speed of the filtration feed pump 5.
【0021】このように、上記実施例では、濾過機7へ
の酒類または押し水の供給を停止するときは、圧力セン
サ11による圧力表示が急激な変動を起こさない程度
に、コントローラ20により濾過送りポンプ5のスピー
ドコントロールをしながら、シーケンサ19により、バ
イパス配管14のバイパスバルブ13の開放と、濾過機
7への入口側切り離し弁9及び出口側切り離し弁10の
閉止めを同時に進行させることにより、濾過機7の急激
な圧力変動や衝撃を防ぎ、以て濾過機7の濾層の崩壊を
起きないようにすることができる。As described above, in the above embodiment, when the supply of liquor or pressurized water to the filter 7 is stopped, the controller 20 filters and sends the water so that the pressure display by the pressure sensor 11 does not fluctuate sharply. By controlling the speed of the pump 5 and simultaneously opening the bypass valve 13 of the bypass pipe 14 and closing the inlet-side disconnection valve 9 and the outlet-side disconnection valve 10 to the filter 7 by the sequencer 19, Abrupt pressure fluctuations and impacts of the filter 7 can be prevented, so that collapse of the filter layer of the filter 7 can be prevented.
【0022】なお、各弁の動作は、急激な圧力変動や衝
撃で濾過機7の濾層の崩壊が起きないようにする必要
上、電動弁または開閉スピード調整が可能なエアー駆動
弁等が適している。The operation of each valve needs to be such that the filter layer of the filter 7 does not collapse due to sudden pressure fluctuations or shocks, and a motor-operated valve or an air-driven valve capable of adjusting the opening and closing speed is suitable. ing.
【0023】[0023]
【発明の効果】以上要するに本発明によれば、濾過機へ
の酒類または押し水の供給を停止する際、バイパス配管
のバルブの開放、濾過機の入口側切り離し弁及び出口側
切り離し弁の閉止めが同時に進行されるため、濾過機内
圧力の急激な変動を阻止し、従って濾過機の濾層の崩壊
を回避つつ、自動的に濾過機を移送配管系から切り離す
ことができる。In summary, according to the present invention, when the supply of liquor or pressurized water to the filter is stopped, the valve of the bypass pipe is opened, and the inlet-side disconnection valve and the outlet-side disconnection valve of the filter are closed. Simultaneously, the filter can be automatically disconnected from the transfer piping system while preventing a sudden change in the pressure inside the filter and thus preventing the filter layer of the filter from collapsing.
【0024】また濾過送りポンプも制御に組み込むこと
ができて、この濾過送りポンプのスピードコントロール
下で、バイパス配管のバルブの開放、濾過機の入口側切
り離し弁及び出口側切り離し弁の閉止めを同時に進行さ
せれば、濾過機内圧力の急激な変動を確実に阻止しつ
つ、自動的に濾過機を移送配管系から切り離すことがで
きる。A filter feed pump can also be incorporated in the control. Under the speed control of the filter feed pump, the opening of the valve of the bypass pipe and the closing of the inlet side cutoff valve and the outlet side cutoff valve of the filter are simultaneously performed. By proceeding, the filter can be automatically disconnected from the transfer piping system while reliably preventing a rapid change in the pressure inside the filter.
【図1】本発明の一実施例を示す図である。FIG. 1 is a diagram showing one embodiment of the present invention.
【図2】図1の濾過機の濾過時の接続状態と切り離し時
の接続状態を示す図である。FIG. 2 is a diagram showing a connection state at the time of filtration and a connection state at the time of disconnection of the filter of FIG. 1;
【図3】従来の濾過機の配管系からの切り離しを示した
図である。FIG. 3 is a diagram showing disconnection of a conventional filter from a piping system.
1 入口タンク 2 上呑み 3 下呑み 4 払い出し配管 5 濾過送りポンプ 6 供給配管 7 濾過機 8 移送配管 9 入口側切り離し弁 10 出口側切り離し弁 11 圧力センサ 12 圧力計 13 バイパスバルブ 14 バイパス配管 15 配管 16 配管 17 送り切り換え弁 18 送り切り換え弁 19 シーケンサ 20 コントローラ DESCRIPTION OF SYMBOLS 1 Inlet tank 2 Upper cup 3 Lower cup 4 Dispense pipe 5 Filtration feed pump 6 Supply pipe 7 Filtration machine 8 Transfer pipe 9 Inlet cutoff valve 10 Outlet cutoff valve 11 Pressure sensor 12 Pressure gauge 13 Bypass valve 14 Bypass pipe 15 Pipe 16 Piping 17 Feed switching valve 18 Feed switching valve 19 Sequencer 20 Controller
───────────────────────────────────────────────────── フロントページの続き (72)発明者 山口 秀樹 東京都千代田区神田司町2丁目3番地 株式会社大林組東京本社内 (72)発明者 奥本 国広 東京都千代田区神田司町2丁目3番地 株式会社大林組東京本社内 (72)発明者 山崎 博史 東京都千代田区神田司町2丁目3番地 株式会社大林組東京本社内 (56)参考文献 特開 平7−274932(JP,A) 特開 昭64−80276(JP,A) 特開 平5−111373(JP,A) 特開 平5−64564(JP,A) 特開 平7−143873(JP,A) (58)調査した分野(Int.Cl.6,DB名) C12G 3/02 119──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hideki Yamaguchi 2-3-3 Kandajicho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Kunihiro Okumoto 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Main Office (72) Inventor Hiroshi Yamazaki 2-3-3 Kandajicho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Main Office (56) References JP-A-7-274932 (JP, A) -80276 (JP, A) JP-A-5-111373 (JP, A) JP-A-5-64564 (JP, A) JP-A-7-143873 (JP, A) (58) Fields investigated (Int. . 6, DB name) C12G 3/02 119
Claims (2)
側切り離し弁の上流側と濾過機からの2次配管系におけ
る出口側切り離し弁の下流側との間にバルブ付きバイパ
ス配管を設けると共に、入口側切り離し弁の近傍の配管
に圧力センサを設け、濾過機への酒類または押し水の供
給を停止するときは、圧力センサによる圧力表示が急激
な変動を起こさない程度に、バイパス配管のバルブの開
放、濾過機への入口側切り離し弁及び出口側切り離し弁
の閉止めを同時に進行させることを特徴とする清酒醸造
システムにおける濾過工程の制御装置。A bypass pipe with a valve is provided between an upstream side of an inlet-side disconnection valve in a primary transfer piping system to a filter and a downstream side of an outlet-side disconnection valve in a secondary piping system from a filter. When a pressure sensor is installed in the pipe near the inlet-side disconnection valve and the supply of liquor or pressurized water to the filter is stopped, the valve on the bypass A control device for a filtration process in a sake brewing system, characterized in that the opening of the filter and the closing of the inlet-side disconnection valve and the outlet-side disconnection valve to the filter are simultaneously advanced.
濾過送りポンプを備え、前記濾過機への酒類または押し
水の供給を停止するときは、前記圧力センサによる圧力
表示が急激な変動を起こさない程度に上記濾過送りポン
プをスピードコントロールしつつ、前記バイパス配管の
前記バルブの開放、上記濾過機への前記入口側切り離し
弁及び出口側切り離し弁の閉止めを同時に進行させるこ
とを特徴とする清酒醸造システムにおける濾過工程の制
御装置。2. The sake brewing system according to claim 1, further comprising a filter feed pump, wherein when the supply of liquor or pressurized water to the filter is stopped, the pressure display by the pressure sensor fluctuates rapidly. Wherein the speed of the filtration feed pump is controlled to an extent that the opening of the valve of the bypass pipe and the closing of the inlet-side disconnection valve and the outlet-side disconnection valve to the filter are simultaneously advanced. Control device for filtration process in brewing system.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6974994A JP2824207B2 (en) | 1994-04-07 | 1994-04-07 | Control device of filtration process in sake brewing system |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP6974994A JP2824207B2 (en) | 1994-04-07 | 1994-04-07 | Control device of filtration process in sake brewing system |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH07274933A JPH07274933A (en) | 1995-10-24 |
JP2824207B2 true JP2824207B2 (en) | 1998-11-11 |
Family
ID=13411767
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP6974994A Expired - Lifetime JP2824207B2 (en) | 1994-04-07 | 1994-04-07 | Control device of filtration process in sake brewing system |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2824207B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102571146B1 (en) * | 2022-06-21 | 2023-08-24 | 황승민 | Stained water foreign matter filtering and filter cleaning automation device |
-
1994
- 1994-04-07 JP JP6974994A patent/JP2824207B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH07274933A (en) | 1995-10-24 |
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