JPH0474049B2 - - Google Patents
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- Publication number
- JPH0474049B2 JPH0474049B2 JP1283689A JP28368989A JPH0474049B2 JP H0474049 B2 JPH0474049 B2 JP H0474049B2 JP 1283689 A JP1283689 A JP 1283689A JP 28368989 A JP28368989 A JP 28368989A JP H0474049 B2 JPH0474049 B2 JP H0474049B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- ozone gas
- pressure
- ozone
- vortex pump
- 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
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- Food Preservation Except Freezing, Refrigeration, And Drying (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
- Oxygen, Ozone, And Oxides In General (AREA)
Description
【発明の詳細な説明】
〔発明の目的〕
（産業上の利用分野）
本発明は、オゾンガスを水に溶解させてオゾン
水を製造するオゾン水製造装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to an ozonated water production apparatus that produces ozonated water by dissolving ozone gas in water.
（従来の技術）
従来のオゾン水製造装置は、例えば特開昭64−
51071号公報に記載されているように、うず巻ポ
ンプを用いて水を循環させながら貯水槽に移送す
るようにした配管途中に、オゾン発生器で発生さ
せたオゾンガスをエジエクターによつて供給して
水に溶解させ、貯水槽内において大気圧のもとで
オゾン水と未溶解オゾンガスとを分離し、そのオ
ゾン水は別途ポンプで目的の場所に移送し、未溶
解オゾンガスは排オゾン処理装置で処理して大気
中に放出するようにしている。(Prior art) Conventional ozone water production equipment is, for example,
As described in Publication No. 51071, ozone gas generated by an ozone generator is supplied by an effluent to a pipe in which water is transferred to a water tank while being circulated using a centrifugal pump. Ozone water is dissolved in water, and undissolved ozone gas is separated from ozone water under atmospheric pressure in a water storage tank.The ozonated water is transported to the destination using a separate pump, and the undissolved ozone gas is treated with an exhaust ozone treatment device. and release it into the atmosphere.
また、特公昭56−12936号公報に記載されてい
るように、水が溜められた貯水槽の底部に、オゾ
ン発生器で発生させたオゾンガスを供給し、オゾ
ンガスが水面に達するまでの間に水に溶解させ、
水面から出た未溶解オゾンガスを排オゾン処理装
置で処理して大気中に放出するようにしている。 Furthermore, as described in Japanese Patent Publication No. 56-12936, ozone gas generated by an ozone generator is supplied to the bottom of a water tank where water is stored, and the ozone gas reaches the water surface. Dissolved in
Undissolved ozone gas released from the water surface is treated with an exhaust ozone treatment device and released into the atmosphere.
（発明が解決しようとする課題）
従来のオゾン水製造装置では、オゾンガスをエ
ジエクターや貯水槽底部に供給されて水面に出る
までの間に水に溶解させるようにしているが、そ
のオゾンガスを水に十分に溶解させることができ
ず、多量の未溶解オゾンガスが発生し、この未溶
解オゾンガスを処理するために排オゾン処理装置
を設けなければならなかつた。(Problem to be Solved by the Invention) In conventional ozone water production equipment, ozone gas is supplied to the ejector or the bottom of the water tank and is dissolved in water before reaching the water surface. It was not possible to dissolve the ozone gas sufficiently, and a large amount of undissolved ozone gas was generated, and an exhaust ozone treatment device had to be installed to treat this undissolved ozone gas.
また、オゾンガスを水に十分に溶解させて高濃
度のオゾン水を製造するには、高圧状態で所定時
間以上滞留させておくことが望ましいが、従来の
オゾン水製造装置では、貯水槽内において大気圧
状態におくため、多量の未溶解オゾンガスが発生
し、この未溶解オゾンガスを処理するために排オ
ゾン処理装置を設けなければならなかつた。 In addition, in order to sufficiently dissolve ozone gas in water and produce highly concentrated ozonated water, it is desirable to let it remain in a high-pressure state for a predetermined period of time, but in conventional ozonated water production equipment, a large amount of water is left in the water storage tank. Due to the atmospheric pressure conditions, a large amount of undissolved ozone gas was generated, and an exhaust ozone treatment device had to be installed to treat this undissolved ozone gas.
本発明は、このような点に鑑みてなされたもの
で、オゾンガスを水に十分に溶解させて高濃度の
オゾン水を製造することができるオゾン水製造装
置を提供することを目的とするものである。 The present invention has been made in view of these points, and an object of the present invention is to provide an ozonated water production device that can sufficiently dissolve ozone gas in water and produce highly concentrated ozonated water. be.
（課題を解決するための手段）
請求項１の発明は、オゾンガスを水に溶解させ
てオゾン水を製造するオゾン水製造装置におい
て、前記水の流通途中に渦流ポンプ１を設け、こ
の渦流ポンプ１の吸込側にオゾンガスを導入する
ものである。
(Means for Solving the Problems) The invention according to claim 1 provides an ozone water production apparatus for producing ozonated water by dissolving ozone gas in water, in which a vortex pump 1 is provided in the middle of the flow of the water, and the vortex pump 1 ozone gas is introduced into the suction side of the
請求項２の発明は、渦流ポンプ１の吐出側に、
オゾンガスが水に溶解するのに必要とする時間は
加圧状態で滞留させるとともにその圧力を高圧か
ら段階的に漸減させる複数の加圧溶解槽７，８を
設けたものである。 In the invention of claim 2, on the discharge side of the vortex pump 1,
A plurality of pressurized dissolution tanks 7 and 8 are provided in which ozone gas is allowed to stay in a pressurized state and the pressure is gradually reduced from a high pressure in stages to determine the time required for the ozone gas to dissolve in water.
（作用）
請求項１の発明では、渦流ポンプ１の特有の作
用により、渦流ポンプ１の羽根車で生じる渦流に
よつて渦流ポンプ１に吸込まれた水とオゾンガス
とが撹拌され、オゾンガスが微細気泡となり、さ
らに、水とオゾンガスとが撹拌されながら昇圧さ
れ、高圧のもとで水へのオゾンガスの溶解が促進
される。しかも、渦流ポンプ１でオゾン水を加圧
しているため、そのままオゾン水の利用場所まで
供給することも可能としている。(Function) In the invention of claim 1, due to the unique action of the vortex pump 1, the water and ozone gas sucked into the vortex pump 1 are stirred by the vortex generated by the impeller of the vortex pump 1, and the ozone gas becomes fine bubbles. Further, the water and ozone gas are pressurized while being stirred, and the dissolution of the ozone gas into the water is promoted under the high pressure. Moreover, since the ozonated water is pressurized by the vortex pump 1, it is possible to supply the ozonated water as is to the place where it is used.
請求項２の発明では、渦流ポンプ１から吐出さ
れる水とオゾンガスの混合液を複数の加圧溶解槽
７，８に通すことにより、オゾンガスが水に溶解
するのに必要とする時間、加圧状態で滞留させ
て、オゾンガスを十分に溶解させ、かつ、その圧
力を高圧から段階的に漸減させて、オゾン水の出
口において圧力降下が大きすぎて絞り効果により
オゾンガスが発生するのを防止するようにしてい
る。 In the invention of claim 2, by passing the mixed liquid of water and ozone gas discharged from the vortex pump 1 through the plurality of pressurized dissolving tanks 7 and 8, the time required for the ozone gas to dissolve in water and the pressurized liquid are reduced. The ozone gas is allowed to stagnate in such a state that the ozone gas is sufficiently dissolved, and the pressure is gradually reduced from a high pressure to prevent ozone gas from being generated due to a throttling effect due to a too large pressure drop at the outlet of the ozonated water. I have to.
（実施例）
以下、本発明の一実施例の構成を図面を参照し
て説明する。(Example) Hereinafter, the configuration of an example of the present invention will be described with reference to the drawings.
第１図において、１は渦流ポンプで、この渦流
ポンプ１の吸込側は、配管２によつて貯水槽３に
連通されている。 In FIG. 1, reference numeral 1 denotes a vortex pump, and the suction side of the vortex pump 1 is communicated with a water storage tank 3 through a pipe 2.
また、４はオゾンガスを発生するオゾン発生器
で、このオゾン発生器４は、途中にガス流量を調
整する流量計５を設けた配管６によつて前記渦流
ポンプ１の吸込側の配管２に連通されている。 Further, 4 is an ozone generator that generates ozone gas, and this ozone generator 4 is connected to the suction side piping 2 of the vortex pump 1 through a piping 6 that is provided with a flow meter 5 for adjusting the gas flow rate. has been done.
また、７，８は加圧溶解槽で、この加圧溶解槽
７，８は、内部に流入したオゾンガスと水の混合
液が加圧下で溶解しやすくするために細長い円筒
状に形成されており、第１の加圧溶解槽７の下部
と前記渦流ポンプ１の吐出側とが配管９によつて
連通され、この第１の加圧溶解槽７の上部と第２
の加圧溶解槽８の下部とが配管１０によつて連通
され、第２の加圧溶解槽８の上部にオゾン水を供
給する外部と連通する配管１１が接続されてい
る。そして、配管１０の途中には第１の加圧溶解
槽７の内部圧力を制御するための圧力制御弁１２
が設けられ、配管１１の途中には第２の加圧溶解
槽８の内部圧力を制御するための圧力制御弁１３
およびオゾン水を流出を閉止する止水栓１４が設
けられ、さらに、各加圧溶解槽７，８には内部圧
力を計る圧力計１５，１６が設けられている。 Further, 7 and 8 are pressurized dissolution tanks, and these pressurized dissolution tanks 7 and 8 are formed into elongated cylindrical shapes in order to facilitate the dissolution of the ozone gas and water mixture that has flowed into them under pressure. , the lower part of the first pressurized dissolution tank 7 and the discharge side of the vortex pump 1 are communicated by a pipe 9, and the upper part of the first pressurized dissolution tank 7 and the second
The lower part of the second pressurized dissolution tank 8 is connected by a pipe 10, and the upper part of the second pressurized dissolution tank 8 is connected to a pipe 11 that communicates with the outside for supplying ozone water. In the middle of the piping 10, there is a pressure control valve 12 for controlling the internal pressure of the first pressurized melting tank 7.
A pressure control valve 13 for controlling the internal pressure of the second pressurized melting tank 8 is provided in the middle of the pipe 11.
A stop valve 14 is provided to stop the ozone water from flowing out. Furthermore, each pressurized dissolution tank 7, 8 is provided with a pressure gauge 15, 16 for measuring the internal pressure.
第２図に前記渦流ポンプ１の構成を示し、ケー
シング２１に、環状の昇圧通路２２が形成され、
この昇圧通路２２の入口部２３に吸込口２４が連
通形成されているとともに、昇圧通路２２の出口
部２５に吐出口２６が連通形成され、昇圧通路２
２の入口部２３と出口部２５との間に隔離部２７
が形成されている。このケーシング２１内に羽根
車３１が回転自在に嵌合されており、この羽根車
３１の外周部には、複数の小羽根３２およびこの
小羽根３２の間に羽根溝３３が形成されている。
そして、この渦流ポンプ１の羽根車３１を回転さ
せると、吸込口２４から吸込まれる水は、羽根車
３１と共に昇圧通路２２をほぼ一周し、その間に
昇圧されて吐出口２６から吐出され、かつ、その
昇圧通路２２に吸込まれた水には、羽根車３１の
羽根溝３３と昇圧通路２２との間で渦流が生じ、
これが各羽根溝３３で同時に行なわれながら昇圧
通路２２内を進み、昇圧通路２２を進むに連れて
昇圧されるようになつている。 FIG. 2 shows the configuration of the vortex pump 1, in which an annular pressure increasing passage 22 is formed in the casing 21,
A suction port 24 is formed in communication with an inlet portion 23 of the pressure increase passage 22, and a discharge port 26 is formed in communication with an outlet portion 25 of the pressure increase passage 22.
A separating part 27 is provided between the inlet part 23 and the outlet part 25 of 2.
is formed. An impeller 31 is rotatably fitted into the casing 21 , and a plurality of small blades 32 and blade grooves 33 are formed between the small blades 32 on the outer periphery of the impeller 31 .
When the impeller 31 of this vortex pump 1 is rotated, the water sucked from the suction port 24 goes around the pressure boosting passage 22 together with the impeller 31, during which time the pressure is increased and the water is discharged from the discharge port 26. In the water sucked into the pressure boosting passage 22, a vortex is generated between the blade groove 33 of the impeller 31 and the pressure boosting passage 22,
This is done simultaneously in each blade groove 33 as the blade advances through the pressure increase passage 22, and as it advances through the pressure increase passage 22, the pressure is increased.
次に、本実施例の作用を説明する。 Next, the operation of this embodiment will be explained.
止水栓１４を開口した後、渦流ポンプ１を始動
させると、貯水槽３内の水は配管２を通じて渦流
ポンプ１に吸込まれる。このとき、配管２内の水
の流れが負圧になることにより、オゾン発生器４
で発生したオゾンガスが配管６を通じて配管２内
に吸込まれ、水と一緒にオゾンガスも渦流ポンプ
１に吸込まれる。 When the vortex pump 1 is started after the stop valve 14 is opened, water in the water tank 3 is sucked into the vortex pump 1 through the piping 2. At this time, the flow of water in the pipe 2 becomes negative pressure, so that the ozone generator 4
The ozone gas generated is drawn into the pipe 2 through the pipe 6, and the ozone gas is also drawn into the vortex pump 1 together with water.
そして、渦流ポンプ１では、上述のように、羽
根車３１の回転により、昇圧通路２２内に水とオ
ゾンガスとが一緒に吸込まれ、羽根車３１の各羽
根溝３３と昇圧通路２２との間で生じる渦流によ
つて水とオゾンガスとが撹拌され、オゾンガスが
微細気泡となり、さらに、水とオゾンガスとが撹
拌されながら昇圧通路２２内を進むに連れて昇圧
され、高圧のもとで水へのオゾンガスの溶解が促
進される。従つて、渦流ポンプ１の特有の作用に
より、オゾンガスが水に十分溶解し、高濃度のオ
ゾン水の製造が可能となる。 In the vortex pump 1, as described above, water and ozone gas are sucked together into the pressure boosting passage 22 by the rotation of the impeller 31, and between each blade groove 33 of the impeller 31 and the pressure boosting passage 22. The water and ozone gas are stirred by the generated vortex, and the ozone gas becomes fine bubbles. Furthermore, as the water and ozone gas are stirred and move through the pressure boosting passage 22, the pressure is increased, and the ozone gas is transferred to the water under high pressure. Dissolution is promoted. Therefore, due to the unique action of the vortex pump 1, ozone gas is sufficiently dissolved in water, making it possible to produce highly concentrated ozone water.
また、渦流ポンプ１から吐出される水とオゾン
ガスの混合液は、配管９を通じて第１の加圧溶解
槽７内に流入する。なお、渦流ポンプ１の吐出圧
力および第１の加圧溶解槽７の内圧は、圧力制御
弁１２を操作することによ、オゾンガスが水に溶
解しやすい高圧に設定されている。 Further, the mixed liquid of water and ozone gas discharged from the vortex pump 1 flows into the first pressurized dissolution tank 7 through the pipe 9. Note that the discharge pressure of the vortex pump 1 and the internal pressure of the first pressurized dissolution tank 7 are set to high pressures at which ozone gas is easily dissolved in water by operating the pressure control valve 12.
そして、この第１の加圧溶解槽７内に流入した
混合液は、高圧状態のもとで、オゾンガスが水に
溶解するのに必要な時間、槽内を移動しながら滞
留し、オゾンガスがより十分に溶解される。 The mixed liquid that has flowed into the first pressurized dissolution tank 7 stays under high pressure while moving within the tank for the time required for the ozone gas to dissolve in water, and the ozone gas becomes more concentrated. fully dissolved.
さらに、第１の加圧溶解槽７内でオゾンガスが
十分に溶解された混合液は、第１の加圧溶解槽７
の上部から配管１０を通じて第２の加圧溶解槽８
内に流入する。なお、この第２の加圧溶解槽８の
内圧は、圧力制御弁１３を操作することにより、
第１の加圧溶解槽７の内圧よりも低く、大気圧よ
りも例えば１気圧高い程度の圧力に設定されてい
る。 Furthermore, the mixed liquid in which ozone gas is sufficiently dissolved in the first pressurized dissolution tank 7 is transferred to the first pressurized dissolution tank 7.
The second pressurized melting tank 8 is passed through the pipe 10 from the top of the
flow inside. Note that the internal pressure of this second pressurized dissolution tank 8 can be controlled by operating the pressure control valve 13.
The pressure is set to be lower than the internal pressure of the first pressurized dissolution tank 7 and higher, for example, by 1 atm than atmospheric pressure.
そして、この第２の加圧溶解槽８内に流入した
混合液は、前記第１の加圧溶解槽７と同様に、所
定圧力状態のもとで、オゾンガスが水に溶解する
のに必要な時間、槽内を移動しながら滞留し、オ
ゾンガスがより十分に溶解される。 Then, as in the first pressurized dissolution tank 7, the mixed liquid that has flowed into the second pressurized dissolution tank 8 is heated under a predetermined pressure state to meet the requirements for ozone gas to dissolve in water. The ozone gas stays there for a while while moving in the tank, and the ozone gas is more fully dissolved.
その後、第２の加圧溶解槽８内でオゾンガスが
十分に溶解された混合液、すなわちオゾン水は、
第２の加圧溶解槽８の上部から配管１１を通じて
外部へ供給される。このとき、渦流ポンプ１によ
つてオゾン水は加圧されているため、そのままオ
ゾン水の利用場所まで供給することができる。 After that, the mixed liquid in which ozone gas is sufficiently dissolved in the second pressurized dissolution tank 8, that is, ozone water, is
It is supplied to the outside from the upper part of the second pressurized dissolution tank 8 through a pipe 11. At this time, since the ozonated water is pressurized by the vortex pump 1, it can be supplied as is to the place where the ozonated water is used.
ところで、前記圧力制御弁１２を通過する際に
絞り効果に伴つて気化したオゾンガスや、第１の
加圧溶解槽７内で溶解されずに第２の加圧溶解槽
８に流入したオゾンガスは、第２の加圧溶解槽８
を通過する間に、圧力と時間によつて確実に溶解
される。 By the way, ozone gas that is vaporized due to the throttling effect when passing through the pressure control valve 12 or ozone gas that has flowed into the second pressurized dissolution tank 8 without being dissolved in the first pressurized dissolution tank 7 is Second pressurized dissolution tank 8
While passing through, it is surely melted by pressure and time.
しかも、加圧溶解槽８の内圧を大気圧よりも例
えば１気圧高い程度の圧力に設定しているため、
オゾン水の出口において、圧力降下が大きすぎて
絞り効果によりオゾンガスが発生するのを防止
し、オゾンガスの発生を微少に抑えることがで
き、未溶解オゾンガスを処理するための排オゾン
処理装置を設けずに済む。 Moreover, since the internal pressure of the pressurized dissolution tank 8 is set to, for example, 1 atm higher than atmospheric pressure,
At the outlet of ozonated water, the pressure drop is too large to prevent ozone gas from being generated due to the throttling effect, and the generation of ozone gas can be suppressed to a very small level, without the need for a waste ozone treatment device to treat undissolved ozone gas. It ends up being
請求項１の発明によれば、渦流ポンプを使用す
るため、この渦流ポンプの特有の作用により、渦
流ポンプの羽根車で生じる渦流によつて渦流ポン
プに吸込まれた水とオゾンガスとが撹拌され、オ
ゾンガスが微細気泡となり、かつ、水とオゾンガ
スとが撹拌されながら昇圧され、高圧のもとで水
へのオゾンガスの溶解が促進されるので、オゾン
ガスを水に十分に溶解させて高濃度のオゾン水を
製造することができ、また、渦流ポンプでオゾン
水を加圧しているため、そのままオゾン水の利用
場所まで供給することも可能としている。
According to the invention of claim 1, since a vortex pump is used, the water and ozone gas sucked into the vortex pump are stirred by the vortex generated by the impeller of the vortex pump due to the unique action of the vortex pump. Ozone gas becomes fine bubbles, and water and ozone gas are pressurized while being stirred, and the dissolution of ozone gas in water is promoted under high pressure. Furthermore, since the ozonated water is pressurized using a vortex pump, it is also possible to supply the ozonated water directly to the place where it is used.
請求項２の発明によれば、渦流ポンプから吐出
される水とオゾンガスの混合液を複数の加圧溶解
槽に通すことにより、オゾンガスが水に溶解する
のに必要とする時間、加圧状態で滞留させて、オ
ゾンガスを十分に溶解させ、かつ、その圧力を高
圧から段階的に漸減させて、オゾン水の出口にお
いて圧力降下が大きすぎて絞り効果によりオゾン
ガスが発生するのを防止し、オゾンガスの発生を
微少に抑えることができ、未溶解オゾンガスを処
理するための排オゾン処理装置を設けずに済む。 According to the invention of claim 2, by passing the mixture of water and ozone gas discharged from the vortex pump through a plurality of pressurized dissolution tanks, the mixture is heated under pressure for the time required for the ozone gas to dissolve in water. The ozone gas is allowed to stagnate, and the ozone gas is sufficiently dissolved, and the pressure is gradually reduced from a high pressure to prevent ozone gas from being generated due to the throttling effect due to a too large pressure drop at the outlet of the ozonated water. The generation can be suppressed to a very small amount, and there is no need to provide an exhaust ozone treatment device for treating undissolved ozone gas.
第１図は本発明のオゾン水製造装置の一実施例
を示す構成図、第２図は渦流ポンプの断面図であ
る。
１……渦流ポンプ、７，８……加圧溶解槽。
FIG. 1 is a block diagram showing an embodiment of the ozone water production apparatus of the present invention, and FIG. 2 is a sectional view of a vortex pump. 1... Vortex pump, 7, 8... Pressurized dissolution tank.
Claims (1)
するオゾン水製造装置において、 前記水の流通途中に渦流ポンプを設け、この渦
流ポンプの吸込側にオゾンガスを導入することを
特徴とするオゾン水製造装置。 ２ 渦流ポンプの吐出側に、オゾンガスが水に溶
解するのに必要とする時間は加圧状態で滞留させ
るとともにその圧力を高圧から段階的に漸減させ
る複数の加圧溶解槽を設けたことを特徴とする請
求項１記載のオゾン水製造装置。[Claims] 1. An ozonated water production device for producing ozonated water by dissolving ozone gas in water, characterized in that a vortex pump is provided in the middle of the flow of the water, and ozone gas is introduced into the suction side of the vortex pump. Ozone water production equipment. 2. A plurality of pressurized dissolution tanks are provided on the discharge side of the vortex pump to allow the ozone gas to remain in a pressurized state for the time required to dissolve in water, and to gradually reduce the pressure from a high pressure. The ozone water production apparatus according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1283689A JPH03146123A (en) | 1989-10-31 | 1989-10-31 | Ozone water preparing apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1283689A JPH03146123A (en) | 1989-10-31 | 1989-10-31 | Ozone water preparing apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03146123A JPH03146123A (en) | 1991-06-21 |
| JPH0474049B2 true JPH0474049B2 (en) | 1992-11-25 |
Family
ID=17668803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1283689A Granted JPH03146123A (en) | 1989-10-31 | 1989-10-31 | Ozone water preparing apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03146123A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3190824U (en) * | 2014-03-12 | 2014-05-29 | 株式会社光未来 | Gas dissolving device |
| CN106457167B (en) * | 2014-05-27 | 2020-06-26 | 株式会社光未来 | Gas dissolving device and gas dissolving method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5529756B2 (en) * | 1975-02-08 | 1980-08-06 | ||
| JPS51128833A (en) * | 1975-05-01 | 1976-11-10 | Ebara Infilco Co Ltd | Aeration method |
| JPS51128836A (en) * | 1975-05-02 | 1976-11-10 | Ebara Infilco Co Ltd | An aeration device |
-
1989
- 1989-10-31 JP JP1283689A patent/JPH03146123A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH03146123A (en) | 1991-06-21 |
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