JP2003144876A - Air diffuser - Google Patents
Air diffuserInfo
- Publication number
- JP2003144876A JP2003144876A JP2001349506A JP2001349506A JP2003144876A JP 2003144876 A JP2003144876 A JP 2003144876A JP 2001349506 A JP2001349506 A JP 2001349506A JP 2001349506 A JP2001349506 A JP 2001349506A JP 2003144876 A JP2003144876 A JP 2003144876A
- Authority
- JP
- Japan
- Prior art keywords
- air
- diffuser
- tube
- base end
- air diffuser
- 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.)
- Granted
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Abstract
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】本発明は散気装置に関し、反
応槽内に気体を平均して散気する技術に係るものであ
る。
【０００２】
【従来の技術】従来、下水処理、上水処理等において反
応槽内に空気等の気体を散気する散気装置は、一般的に
槽内に浸漬する散気管に複数の散気孔を軸心方向に沿っ
て適当間隔で設けており、散気管は先端を構造的に閉塞
するか、バルブで閉栓しており、基端側にブロワを接続
している。
【０００３】散気装置はブロワから供給する空気を散気
管の各散気孔から槽内液中に噴出させて槽内液の曝気や
攪拌、酸素供給等を行うが、散気による槽内液の攪拌や
酸素供給等の効果の有効性を高めるためには、散気管の
各散気孔から噴出する空気量が均一であることが望まし
い。
【０００４】
【発明が解決しようとする課題】しかし、散気管が長尺
である場合には、散気管の各散気孔から噴出する空気量
は均一でなく、散気管は空気が流入する基端に近い程に
散気孔から噴出する空気量が少なく、先端に近い程に散
気孔から噴出する空気量が多くなる。
【０００５】このため、基端に近い程に散気孔の口径を
大きくしてその圧力損失を小さくし、先端に近い程に散
気孔の口径を小さくしてその圧力損失を大きくすること
で、各散気孔から噴出する空気量を平均化することが可
能である。また、散気管に形成する散気孔の配置ピッチ
を基端に近い程に小さくしてその分布密度を高め、散気
孔の配置ピッチを先端に近い程に大きくしてその分布密
度を低めることで、噴出する空気量を散気管全体として
平均化することが可能である。
【０００６】しかし、散気孔の口径や配置ピッチを計算
によって予め求めることは困難であり、散気孔の口径や
配置ピッチが異なる多数の散気管を用意し、経験則とし
て散気孔の口径や配置ピッチの最適条件を決定すること
は困難であり、現実的な方途ではない。
【０００７】本発明は上記した課題を解決するものであ
り、散気管の各散気孔から噴出する空気量を平均化して
散気による作用効果を高めることができる散気装置を提
供することを目的とする。
【０００８】
【課題を解決するための手段】上記課題を解決するため
に、本発明の散気装置は、槽内に浸漬する散気管に複数
の散気孔を設け、散気管の基端に空気供給源を接続し、
散気管を基端から先端に向けて下り勾配で傾斜配置して
散気管の先端と基端との間に所定水深差を生じさせるこ
とで、散気管の各散気孔に作用する背圧を先端に近い程
に漸次に高く設定したものである。
【０００９】上記した構成において、各散気孔から噴出
する空気量は散気管内の圧力と各散気孔に背圧として作
用する水圧との差圧によって決まり、散気管内の圧力分
布の傾向は基端側から先端側へ漸次に高くなり、この圧
力分布は散気管の姿勢に影響されずほぼ一定である。こ
のため、先端に近い程に各散気孔に作用する背圧を高く
することで、散気管内の圧力と各散気孔の背圧との差圧
を一定となし、噴出する空気量を平均化する。
【００１０】
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて説明する。図１〜図３において、曝気槽１に
浸漬した散気装置２は散気ケース３の内部に散気管４を
配置しており、散気管４の基端に接続した空気供給管５
にブロワ６を設け、散気管４の先端に接続した洗浄用管
７に洗浄用バルブ８を設けている。
【００１１】散気管４は所定口径の大径管からなる幹管
９と、幹管９の下方に配置した所定口径の小径管からな
る複数の枝管１０とからなる。枝管１０は逆Ｔ字形をな
し、上部の一端で幹管９に連通するとともに、両端が幹
管９の下方位置で開口しており、枝管１０の上部位に複
数の散気孔１１を設けている。
【００１２】散気管４は幹管９の基端から先端に向けて
下り勾配で傾斜して配置しており、散気管４の幹管９の
先端と基端との間に５〜２０ｍｍの所定水深差Ｌを生じ
させている。この傾斜は散気管４と散気ケース３のフレ
ームとの間にスペーサ等を介装することで与える。この
結果、曝気槽１の槽内液の水圧によって散気管４の各散
気孔１１に作用する背圧は幹管９の先端に近い程に漸次
に高くなる。
【００１３】散気管４の両端の水深差の適値は散気管４
の勾配を変化させて経験的に求め、後述するように、散
気管４の内部圧力と各散気孔１１の背圧との差圧が一定
となり、各散気孔１１から噴出する空気量が均一となる
水深差とする。
【００１４】以下、上記した構成における作用を説明す
る。散気運転時には洗浄用バルブ８を閉栓した状態で、
ブロア６から所定圧力の空気を散気管４へ供給する。こ
の空気は幹管９を通して各枝管１０に流れ、枝管１０の
両端の開口に達する前に各散気孔１１から曝気槽１の槽
内液中に噴出する。
【００１５】各散気孔１１から噴出する空気量は散気管
４の内部圧力と各散気孔１１に背圧として作用する水圧
との差圧によって決まる。散気管４の内部の圧力分布の
傾向は基端側から先端側へ漸次に高くなり、この圧力分
布は散気管４の姿勢に影響されずほぼ一定である。
【００１６】図６は散気管４の内部の圧力分布を測定し
た結果を示すものであり、散気管４を水平に配置した状
態で散気管に供給する空気量を変化させた場合と、本実
施の形態のように散気管４を傾斜配置した状態で散気管
４に供給する空気量を変化させた場合とについて開示し
ており、測定位置を示す符号は幹管９の基端側から先端
側へ順次に大きくなる。
【００１７】ａ折線は散気管４が水平で０．６２５ｍ3
／ｍｉｎの空気量の場合を示し、ｂ折線は散気管４が水
平で０．７５ｍ3／ｍｉｎの空気量の場合を示し、ｃ折
線は散気管４が水平で０．９ｍ3／ｍｉｎの空気量の場
合を示し、ｄ折線は散気管４が入口側（基端側）で１０
ｍｍ高くなるように傾斜して０．６２５ｍ3／ｍｉｎの
空気量の場合を示し、ｅ折線は散気管４が入口側（基端
側）で１０ｍｍ高くなるように傾斜して０．７５ｍ3／
ｍｉｎの空気量の場合を示し、ｆ折線は散気管４が入口
側（基端側）で１０ｍｍ高くなるように傾斜して０．９
ｍ3／ｍｉｎの空気量の場合を示している。ａ〜ｃを求
めた水位とｅ〜ｆを求めた水位とは多少異なっており、
そのために水圧に差異が見られる。
【００１８】しかし、散気管４が水平であるか傾斜して
いるかに拘わらず、空気量の多寡に拘わらず、圧力分布
の傾向はほぼ一定であり、幹管９の先端に近い程に圧力
が高くなる傾向がある。
【００１９】一方、散気管４の各散気孔１１に作用する
背圧は、散気管４を先端に向けて下り勾配に傾斜して配
置し、散気管４の先端と基端との間に所定水深差を生じ
させることで、先端に近い程に各散気孔１１に作用する
背圧が高くなる。このため、散気管４の内部圧力と各散
気孔１１の背圧との差圧が一定となり、各散気孔１１か
ら噴出する空気量が平均化される。
【００２０】図４は散気管４を水平に配置した状態で各
枝管１０の散気孔１１における空気量を測定した結果を
示すものであり、ａ折線は供給空気量が０．６２５ｍ3
／ｍｉｎの場合を示し、ｂ折線は供給空気量が０．７５
ｍ3／ｍｉｎの場合を示し、ｃ折線は供給空気量が０．
９ｍ3／ｍｉｎの場合を示している。
【００２１】このように、散気管４を水平に配置した場
合には幹管９の先端に近い程に散気孔１１から噴出する
空気量が多くなる。図５は散気管４を入口側（基端側）
で１０ｍｍ高くなるように傾斜して配置した状態で各枝
管１０の散気孔１１における空気量を測定した結果を示
すものであり、ａ折線は供給空気量が０．６２５ｍ3／
ｍｉｎの場合を示し、ｂ折線は供給空気量が０．７５ｍ
3／ｍｉｎの場合を示し、ｃ折線は供給空気量が０．９
ｍ3／ｍｉｎの場合を示している。
【００２２】このように、散気管４を先端と基端との間
に所定水深差が生じるように傾斜配置した場合には、各
散気孔１１から噴出する空気量が平均化される。洗浄時
には、洗浄用バルブ８を開栓し、ブロア６から散気管４
の幹管９に供給する空気を洗浄用管７を通して大気圧下
に排気する。
【００２３】このとき、散気管４の幹管９の内部を流れ
る空気が枝管１０の散気孔１１に比べて背圧および抵抗
の小さい洗浄用管７の排気口（大気圧下）へ向って流れ
ることで、槽内液が散気孔１１を通して枝管１０および
幹管９の内部に流入する。槽内液は枝管１０および幹管
９の内部の付着物を洗い流し、幹管９を流れる空気とと
もに洗浄用管７へ流入し、エアリフト作用によって排気
口から排出される。
【００２４】圧力の低下した散気管４へ槽内液が急激に
流入するとその抵抗によって内部の圧力が高まって槽内
液の流入が停止し、洗浄用管７でのエアリフト作用によ
って散気管４の内部の槽内液を排出して散気管４の内部
の圧力が低下すると槽内液が再び散気管４へ流入し、散
気管４および洗浄用管７において脈動が発生する。
【００２５】このように脈動が発生して散気管４の内部
の圧力が急激な増減を繰り返して変化し、散気管４の内
部に急速な槽内液の流れが反復的に生じることで散気管
４の内部の付着物を洗浄する効果が高まる。
【００２６】
【発明の効果】以上のように、本発明によれば、散気管
を空気供給源に接続する基端から先端に向けて下り勾配
で傾斜配置して散気管の先端と基端との間に所定水深差
を生じさせ、散気管の各散気孔に作用する背圧を先端に
近い程に漸次に高く設定することで、散気管内の圧力と
各散気孔の背圧との差圧を一定となし、噴出する空気量
を平均化することができる。Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a diffuser, and more particularly to a technique for averaging and diffusing gas in a reaction tank. 2. Description of the Related Art Conventionally, a diffuser for diffusing gas such as air into a reaction tank in sewage treatment, water supply treatment, or the like, generally includes a plurality of diffusing holes in a diffuser pipe immersed in the tank. Are provided at appropriate intervals along the axial direction, and the diffuser tube is structurally closed at the distal end or closed with a valve, and a blower is connected to the proximal end side. [0003] The air diffuser blows air supplied from a blower into the liquid in the tank from each of the air diffusion holes of the air diffuser to aerate and agitate the liquid in the tank, supply oxygen, and the like. In order to enhance the effectiveness of effects such as stirring and oxygen supply, it is desirable that the amount of air ejected from each diffuser hole of the diffuser tube be uniform. [0004] However, when the air diffuser is long, the amount of air ejected from each diffuser hole of the air diffuser is not uniform, and the air diffuser is located at the base end where air flows in. The closer to the end, the smaller the amount of air ejected from the diffuser holes, and the closer to the tip, the greater the amount of air ejected from the diffuser holes. [0005] For this reason, by increasing the diameter of the diffuser hole closer to the base end to reduce its pressure loss, and by decreasing the diameter of the diffuser hole closer to the distal end to increase its pressure loss, It is possible to equalize the amount of air ejected from the diffusing holes. Also, by reducing the arrangement pitch of the diffuser holes formed in the diffuser tube closer to the base end to increase the distribution density, and increasing the arrangement pitch of the diffuser holes closer to the distal end to lower the distribution density, It is possible to average out the amount of air to be blown out as an entire diffuser. However, it is difficult to obtain the diameter and arrangement pitch of the diffusing holes in advance by calculation, and a large number of diffusing tubes having different diameters and arrangement pitches of the diffusing holes are prepared. It is difficult to determine the optimal conditions of the above, and it is not a practical way. An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an air diffuser capable of averaging the amount of air blown out from each air diffuser hole of a diffuser tube to enhance the effect of the air diffuser. And [0008] In order to solve the above-mentioned problems, a diffuser according to the present invention is provided with a plurality of diffuser holes in a diffuser tube immersed in a tank, and air is provided at a base end of the diffuser tube. Connect the source,
The back pressure acting on each diffuser hole of the diffuser tube is set at the distal end by arranging the diffuser tube at a downward slope from the base end to the distal end and causing a predetermined water depth difference between the distal end and the base end of the diffuser tube. Is set to be gradually higher as is closer to. In the above arrangement, the amount of air ejected from each diffuser is determined by the pressure difference between the pressure in the diffuser and the water pressure acting as a back pressure on each diffuser. The pressure gradually increases from the end to the tip, and this pressure distribution is substantially constant without being affected by the attitude of the air diffuser. For this reason, by increasing the back pressure acting on each diffuser hole closer to the tip, the differential pressure between the pressure inside the diffuser pipe and the back pressure of each diffuser hole is made constant, and the amount of air blown out is averaged I do. Embodiments of the present invention will be described below with reference to the drawings. 1 to 3, an air diffuser 2 immersed in an aeration tank 1 has an air diffuser 4 disposed inside an air diffuser case 3 and an air supply pipe 5 connected to a base end of the diffuser 4.
Is provided with a blower 6, and a cleaning valve 8 is provided in a cleaning tube 7 connected to the tip of the diffuser tube 4. The air diffuser 4 comprises a main pipe 9 composed of a large-diameter pipe having a predetermined diameter, and a plurality of branch pipes 10 composed of small-diameter pipes having a predetermined diameter disposed below the main pipe 9. The branch pipe 10 has an inverted T-shape, communicates with the main pipe 9 at one upper end, and both ends are open at a position below the main pipe 9, and a plurality of air diffusion holes 11 are provided at an upper portion of the branch pipe 10. ing. The diffuser tube 4 is arranged so as to be inclined downward from the base end of the main tube 9 toward the distal end thereof, and a predetermined distance of 5 to 20 mm is provided between the distal end and the base end of the main tube 9 of the diffuser tube 4. A water depth difference L is generated. This inclination is given by interposing a spacer or the like between the diffuser tube 4 and the frame of the diffuser case 3. As a result, the back pressure acting on each diffuser hole 11 of the diffuser tube 4 due to the water pressure of the liquid in the aeration tank 1 gradually increases nearer to the tip of the main pipe 9. The appropriate value of the water depth difference between both ends of the diffuser 4 is
Empirically obtained by changing the gradient of the air, and as described later, the differential pressure between the internal pressure of the air diffuser 4 and the back pressure of each air diffuser 11 becomes constant, and the amount of air ejected from each air diffuser 11 becomes uniform. Water depth difference. The operation of the above configuration will be described below. During the aeration operation, with the cleaning valve 8 closed,
Air of a predetermined pressure is supplied from the blower 6 to the air diffuser 4. This air flows into each branch pipe 10 through the main pipe 9, and blows out from each air diffusion hole 11 into the liquid in the aeration tank 1 before reaching the openings at both ends of the branch pipe 10. The amount of air ejected from each diffuser hole 11 is determined by the pressure difference between the internal pressure of the diffuser tube 4 and the water pressure acting as a back pressure on each diffuser hole 11. The tendency of the pressure distribution inside the air diffuser 4 gradually increases from the base end to the distal end, and this pressure distribution is substantially constant without being affected by the attitude of the air diffuser 4. FIG. 6 shows the result of measuring the pressure distribution inside the air diffuser 4, in which the amount of air supplied to the air diffuser 4 is changed while the air diffuser 4 is horizontally arranged, and in the present embodiment. And the case where the amount of air supplied to the air diffuser 4 is changed in a state where the air diffuser 4 is inclined as in the embodiment described above, and the reference numeral indicating the measurement position is from the base end side to the distal end side of the main pipe 9. Sequentially increases. The folding line a indicates that the diffuser 4 is horizontal and 0.625 m 3.
The b-fold line shows the case where the air diffuser 4 is horizontal and the air amount is 0.75 m 3 / min, and the c-fold line shows the case where the air diffuser 4 is horizontal and the air amount is 0.9 m 3 / min. The d-fold line indicates that the air diffuser 4 has 10 points on the inlet side (base end side).
In this case, the air flow rate is 0.625 m 3 / min when the air diffuser 4 is inclined to increase by 10 mm on the inlet side (proximal end side) and 0.75 m 3 / min.
In the case of the air amount of min, the f-shaped line is inclined by 0.9 mm so that the air diffuser 4 becomes higher by 10 mm on the inlet side (base end side).
The case of the air amount of m 3 / min is shown. The water levels for which a to c were determined are slightly different from the water levels for which e to f were determined,
Therefore, there is a difference in water pressure. However, regardless of whether the air diffuser 4 is horizontal or inclined, the tendency of the pressure distribution is almost constant irrespective of the amount of air, and the closer the pressure is to the tip of the main pipe 9, the more the pressure becomes. Tends to be higher. On the other hand, the back pressure acting on each diffuser hole 11 of the diffuser tube 4 is set such that the diffuser tube 4 is arranged with a downward inclination toward the distal end, and is provided between the distal end and the proximal end of the diffuser tube 4. By producing a water depth difference, the back pressure acting on each diffuser hole 11 becomes higher nearer to the tip. For this reason, the differential pressure between the internal pressure of the diffuser pipe 4 and the back pressure of each diffuser hole 11 becomes constant, and the amount of air ejected from each diffuser hole 11 is averaged. FIG. 4 shows the result of measuring the amount of air in the air diffusing holes 11 of each branch pipe 10 in a state where the diffusing pipe 4 is arranged horizontally. The broken line a indicates that the supplied air amount is 0.625 m 3.
/ Min, and the b-fold line indicates that the supply air amount is 0.75.
The case of m 3 / min is shown.
The case of 9 m 3 / min is shown. As described above, when the diffuser tube 4 is arranged horizontally, the amount of air blown out from the diffuser holes 11 becomes larger as it comes closer to the tip of the main tube 9. Fig. 5 shows the diffuser 4 on the inlet side (proximal side)
FIG. 6 shows the result of measuring the air amount in the air diffusing holes 11 of each branch pipe 10 in a state where it is inclined so as to be higher by 10 mm. The a-fold line indicates that the supply air amount is 0.625 m 3 /.
min, the b-fold line indicates that the supply air amount is 0.75 m
3 / min, and the c-fold line indicates that the supply air amount is 0.9.
The case of m 3 / min is shown. As described above, when the diffuser tube 4 is arranged so as to be inclined so that a predetermined water depth difference is generated between the distal end and the proximal end, the amount of air ejected from each diffuser hole 11 is averaged. At the time of cleaning, the cleaning valve 8 is opened and the air diffuser 4
The air supplied to the main pipe 9 is exhausted under the atmospheric pressure through the cleaning pipe 7. At this time, the air flowing inside the main pipe 9 of the air diffuser 4 is directed toward the exhaust port (under atmospheric pressure) of the cleaning pipe 7 having a lower back pressure and resistance than the air diffuser holes 11 of the branch pipe 10. By flowing, the liquid in the tank flows into the branch pipe 10 and the main pipe 9 through the air diffusion holes 11. The liquid in the tank rinses off the deposits inside the branch pipe 10 and the main pipe 9, flows into the cleaning pipe 7 together with the air flowing through the main pipe 9, and is discharged from the exhaust port by an air lift action. When the liquid in the tank suddenly flows into the diffuser pipe 4 having a reduced pressure, the internal pressure increases due to the resistance, and the flow of the liquid in the tank is stopped. When the liquid in the tank is discharged and the pressure inside the diffuser tube 4 decreases, the liquid in the tank flows into the diffuser tube 4 again, and pulsation occurs in the diffuser tube 4 and the cleaning tube 7. As described above, the pulsation is generated, and the pressure inside the air diffuser 4 is repeatedly changed rapidly, and a rapid flow of the liquid in the tank is repeatedly generated inside the air diffuser 4. The effect of cleaning the deposits inside 4 is enhanced. As described above, according to the present invention, the air diffuser is inclined at a downward gradient from the base end connected to the air supply source to the front end, and the front end and the base end of the air diffuser are connected to each other. Between the pressure in the diffuser and the back pressure of each diffuser by gradually increasing the back pressure acting on each diffuser in the diffuser nearer to the tip. The pressure is kept constant, and the amount of air blown out can be averaged.
【図面の簡単な説明】
【図１】本発明の実施の形態における散気装置を示す正
面図である。
【図２】同散気装置の散気管を示す横断面図である。
【図３】同散気装置の散気管を示す要部拡大図である。
【図４】散気管を水平とする状態での各散気孔における
空気量を示すグラフ図である。
【図５】散気管を傾斜配置する状態での各散気孔におけ
る空気量を示すグラフ図である。
【図６】散気管の内部圧力分布を示すグラフ図である。
【符号の説明】
１ 曝気槽
２ 散気装置
３ 散気ケース
４ 散気管
５ 空気供給管
６ ブロワ
７ 洗浄用管
８ 洗浄用バルブ
９ 幹管
１０ 枝管
１１ 散気孔BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing an air diffuser according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing an air diffusion tube of the air diffusion device. FIG. 3 is an enlarged view of a main part showing an air diffusion tube of the air diffusion device. FIG. 4 is a graph showing the amount of air in each diffuser hole when the diffuser is horizontal. FIG. 5 is a graph showing the amount of air in each air diffusion hole in a state where the air diffusion pipe is inclined. FIG. 6 is a graph showing an internal pressure distribution of the air diffuser. [Description of Signs] 1 Aeration tank 2 Air diffuser 3 Air diffuser case 4 Air diffuser 5 Air supply pipe 6 Blower 7 Cleaning pipe 8 Cleaning valve 9 Main pipe 10 Branch pipe 11 Air diffuser
───────────────────────────────────────────────────── フロントページの続き (72)発明者 岡島 康信 大阪府大阪市浪速区敷津東一丁目２番47号 株式会社クボタ内 Ｆターム(参考） 4D029 AA01 AB07 BB10 4G035 AB07 AC15 AE13 ────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yasunobu Okajima 2-47 Shikitsu Higashi, Naniwa-ku, Osaka-shi, Osaka Kubota Corporation F term (reference) 4D029 AA01 AB07 BB10 4G035 AB07 AC15 AE13
Claims (1)
設け、散気管の基端に空気供給源を接続し、散気管を基
端から先端に向けて下り勾配で傾斜配置して散気管の先
端と基端との間に所定水深差を生じさせることで、散気
管の各散気孔に作用する背圧を先端に近い程に漸次に高
く設定したことを特徴とする散気装置。Claims: 1. A plurality of air diffusion holes are provided in an air diffuser tube immersed in a tank, an air supply source is connected to a base end of the air diffuser tube, and the air diffuser tube descends from the base end to the distal end. By forming a predetermined difference in water depth between the tip and base end of the air diffuser by arranging it with a gradient, the back pressure acting on each air diffusion hole of the air diffuser is set to gradually increase as it approaches the tip. Characteristic air diffuser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001349506A JP3784303B2 (en) | 2001-11-15 | 2001-11-15 | Air diffuser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001349506A JP3784303B2 (en) | 2001-11-15 | 2001-11-15 | Air diffuser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003144876A true JP2003144876A (en) | 2003-05-20 |
| JP3784303B2 JP3784303B2 (en) | 2006-06-07 |
Family
ID=19162164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001349506A Expired - Fee Related JP3784303B2 (en) | 2001-11-15 | 2001-11-15 | Air diffuser |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3784303B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011092835A (en) * | 2009-10-28 | 2011-05-12 | Mitsubishi Rayon Co Ltd | Method for operating aeration device |
| WO2014065268A1 (en) | 2012-10-25 | 2014-05-01 | 三菱レイヨン株式会社 | Aeration device, operation method therefor, and water treatment apparatus |
| JP2015085314A (en) * | 2013-09-26 | 2015-05-07 | 三菱レイヨン株式会社 | Air diffusion device and water treatment apparatus |
| CN107935209A (en) * | 2017-10-26 | 2018-04-20 | 上海市政工程设计研究总院（集团）有限公司 | One kind aeration partial pressure control method |
-
2001
- 2001-11-15 JP JP2001349506A patent/JP3784303B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011092835A (en) * | 2009-10-28 | 2011-05-12 | Mitsubishi Rayon Co Ltd | Method for operating aeration device |
| WO2014065268A1 (en) | 2012-10-25 | 2014-05-01 | 三菱レイヨン株式会社 | Aeration device, operation method therefor, and water treatment apparatus |
| JP2015085314A (en) * | 2013-09-26 | 2015-05-07 | 三菱レイヨン株式会社 | Air diffusion device and water treatment apparatus |
| CN107935209A (en) * | 2017-10-26 | 2018-04-20 | 上海市政工程设计研究总院（集团）有限公司 | One kind aeration partial pressure control method |
| CN107935209B (en) * | 2017-10-26 | 2024-01-19 | 上海市政工程设计研究总院（集团）有限公司 | Aeration partial pressure control method |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3784303B2 (en) | 2006-06-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| TWI380851B (en) | Device for gassing a liquid | |
| KR20150053981A (en) | Aeration device, operation method therefor, and water treatment apparatus | |
| JPH07265676A (en) | Gas dissolution | |
| US6843470B2 (en) | Air diffuser and flushing method thereof | |
| KR840007361A (en) | Variable Concentration Hose End Spray | |
| JP5532819B2 (en) | Operation method of air diffuser | |
| US20110101548A1 (en) | Diffuser for aeration | |
| JPH07856A (en) | Floatation cell | |
| JP2003144876A (en) | Air diffuser | |
| JPH09253685A (en) | Aeration apparatus | |
| KR20190023452A (en) | Venturi equipment for gas boilers | |
| JP2002058976A (en) | Ejector | |
| JP2792015B2 (en) | Gas dissolution equipment | |
| JP2009202139A (en) | Gas diffuser member | |
| CN107143016A (en) | Deodor water closet | |
| JP2002186840A (en) | Fine bubbles production method and device therefor | |
| JP2005055333A (en) | Gas sampling bag | |
| JP4618899B2 (en) | Sludge transfer device | |
| US6039917A (en) | Jet column reactor pump with coaxial and/or lateral intake opening | |
| JP2003056500A (en) | Ejector | |
| CN210115033U (en) | Aeration device for liquid preparation system and liquid preparation system | |
| CN220926476U (en) | Negative pressure type maintenance-free jet aerator | |
| JP2002186991A (en) | Air diffuser | |
| CN215951781U (en) | Water-gas mixing device and water heater | |
| JPS60227887A (en) | Stirrer for digestion tank |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20040922 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20060209 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20060214 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20060314 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090324 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100324 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100324 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110324 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110324 Year of fee payment: 5 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120324 Year of fee payment: 6 |
|
| LAPS | Cancellation because of no payment of annual fees |