JP3202391B2 - Defoaming device - Google Patents
Defoaming deviceInfo
- Publication number
- JP3202391B2 JP3202391B2 JP05807393A JP5807393A JP3202391B2 JP 3202391 B2 JP3202391 B2 JP 3202391B2 JP 05807393 A JP05807393 A JP 05807393A JP 5807393 A JP5807393 A JP 5807393A JP 3202391 B2 JP3202391 B2 JP 3202391B2
- Authority
- JP
- Japan
- Prior art keywords
- liquid
- main body
- bubbles
- defoaming
- suction
- 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 - Fee Related
Links
Landscapes
- Degasification And Air Bubble Elimination (AREA)
- Physical Water Treatments (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明はコータ（紙仕上機械）の
塗工液内の気泡分離、塗料、ワニス、インキ、接着剤、
ミルク、ラテックス、油圧作動油など各種液体における
気泡分離に利用できる脱泡装置に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the separation of air bubbles in a coating liquid of a coater (paper finishing machine), paints, varnishes, inks, adhesives,
The present invention relates to a defoaming device that can be used for separating bubbles in various liquids such as milk, latex, and hydraulic oil.
【０００２】[0002]
【従来の技術】各種液体中に気泡が含まれている場合に
は、この気泡が機器の損傷、エアレーション及びキャビ
テーションによるエロージョン、騒音、製品不良、流体
流量計測誤差等を引き起こす原因となるため、気泡を液
体中より分離除去することが必要である。従来より液体
中に混入する気泡を除去するための試みは種々なされて
おり、また脱泡の方式は、遠心力式と重力式に大きく分
けられる。2. Description of the Related Art When various liquids contain air bubbles, the air bubbles may cause damage to equipment, erosion due to aeration and cavitation, noise, product defects, fluid flow measurement errors, and the like. Must be separated and removed from the liquid. Conventionally, various attempts have been made to remove air bubbles mixed into a liquid, and defoaming methods are roughly classified into a centrifugal force method and a gravity method.
【０００３】次に前記遠心力式と重力式の夫々について
従来例を説明すると、図４は遠心力を利用した脱泡装置
の例であり、円筒状容器ａの軸心部に内筒ｆを設け、同
容器ａの上部の一側に流入口ｂを、また容器ａの下部の
一側に流出口ｄをそれぞれ設ける。そして容器ａの内面
と内筒ｆの外面とで形成される環状空間で、液体を流入
口ｂから内筒ｆの接線方向に流すことによって液体が旋
回し、その遠心力で比重の軽い気泡を中央に集め、浮上
分離させるようにしたものである。Next, conventional examples of the centrifugal force type and the gravity type will be described. FIG. 4 shows an example of a defoaming device utilizing centrifugal force. An inlet b is provided on one side of the upper part of the container a, and an outlet d is provided on one side of the lower part of the container a. Then, in the annular space formed by the inner surface of the container a and the outer surface of the inner cylinder f, the liquid is swirled by flowing the liquid from the inflow port b in the tangential direction of the inner cylinder f, and bubbles having a low specific gravity are generated by the centrifugal force. It is collected at the center and floated.
【０００４】また図５は重力式の脱泡装置の例で、容器
ａの下部に流体流入口ｂを設け、同流入口ｂから流入し
た気液二相流を一旦斜め下方へ移行させるよう、下面を
傾斜させたバケットｃを前記容器ａ内に収納し、同バケ
ットｃに取付けた流出口ｄを容器ａ外へ突出させ、かつ
容器ａ内に入れた液体の液面にフロートバルブｅを浮か
せた構成としてあり、流入口ｂから流入した気泡を含む
液体は、バケットｃの底部に衝突して上向きに方向を変
え、バケットｃ内に反転して流れ込み、気泡は浮上して
液体のみが流出口ｄより流出するようにしてある。FIG. 5 shows an example of a gravity type defoaming device, in which a fluid inlet b is provided at a lower portion of a container a so that a gas-liquid two-phase flow flowing from the inlet b is shifted obliquely downward. A bucket c having an inclined lower surface is accommodated in the container a, an outlet d attached to the bucket c is projected out of the container a, and a float valve e is floated on a liquid surface of the liquid contained in the container a. The liquid containing bubbles flowing from the inlet b collides with the bottom of the bucket c and changes its direction upward, flows in the bucket c in reverse, and the bubbles float and only the liquid flows out of the outlet c. d.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら図４の遠
心力式の脱泡装置は流体を旋回させることにより発生す
る遠心力を利用して、気泡を中央に集めて分離させるも
のであるため、以下のような問題があった。先ず流体に
旋回流を与える必要があるため、装置の構造が複雑にな
ると共に、大流量の場合は、旋回半径を小にすることが
できず、与え得る遠心力に限界があって、気泡集結機能
が十分でなかった。また大流量の場合に遠心力を大きく
するために、装置への供給速度を大きくとると、供給ポ
ンプの動力が大きくなる欠点があった。更に遠心力を与
えるのが供給ポンプ動力のみであったため、装置内で遠
心力の働いている範囲は狭く、装置が有効に稼動してい
ない等の問題があった。一方図５の重力式の脱泡装置は
気泡の浮上性を利用したものであるが、図５の例では分
離に多大な時間がかかって能率が悪く、かつ容器、槽が
大型になると共に、流体粘度が上昇すると、分離効率が
悪くなる等の問題があった。本発明は前記従来の問題を
解決するために提案されたものである。However, the centrifugal defoaming device shown in FIG. 4 utilizes the centrifugal force generated by swirling the fluid to collect and separate bubbles at the center. There was such a problem. First, it is necessary to apply a swirling flow to the fluid, which complicates the structure of the device. In the case of a large flow rate, the swirling radius cannot be reduced, and there is a limit to the centrifugal force that can be applied. Function was not enough. Further, when the supply speed to the apparatus is increased in order to increase the centrifugal force in the case of a large flow rate, there is a disadvantage that the power of the supply pump is increased. Furthermore, since only the supply pump power gives the centrifugal force, the range in which the centrifugal force works in the apparatus is narrow, and there are problems such as the apparatus not operating effectively. On the other hand, the gravity type defoaming device shown in FIG. 5 utilizes the buoyancy of air bubbles, but in the example of FIG. When the fluid viscosity increases, there is a problem that the separation efficiency deteriorates. The present invention has been proposed to solve the conventional problem.
【０００６】[0006]
【課題を解決するための手段】このため本発明は、下部
に液体供給口、上部に空気抜きパイプを備えた脱泡装置
であって、装置本体の内部に、上面が液体中に開口する
とともに、下部に前記装置本体の外部に連通する液排出
口を有し、当該液排出口側から上方に向けて前記装置本
体の内面との間隔が徐々に縮小する漏斗状のサクション
マウスが設けられて、前記サクションマウスは、漏斗状
の部分の上部にて、前記装置本体内面との間に、前記液
体供給口から前記装置本体の内部に供給された液体の流
速を増加させる狭隘部を形成し、前記装置本体の側部
に、前記狭隘部を通過した液体を前記狭隘部の上流側に
て前記装置本体に循環させる液体循環手段が設けられて
いることを特徴とする。 SUMMARY OF THE INVENTION Accordingly, the present invention provides a defoaming apparatus having a liquid supply port at a lower portion and an air vent pipe at an upper portion.
Wherein the upper surface opens into the liquid inside the device body
At the same time, a liquid discharge communicating with the outside of the device body at the bottom
The device main body from the liquid discharge port side upward.
Funnel-shaped suction where the distance from the inner surface of the body gradually decreases
A mouse is provided, the suction mouse is funnel-shaped
Above the part, between the inner surface of the device body and the liquid
The flow of the liquid supplied from the body supply port to the inside of the device body
Forming a narrow portion to increase the speed, the side of the device body
The liquid that has passed through the narrow part is located upstream of the narrow part.
Liquid circulating means for circulating in the apparatus main body is provided.
It is characterized by being.
【０００７】[0007]
【作用】装置本体内を上昇する気泡を含む液体は、サク
ションマウス外側と装置本体内壁との狭隘部で流速が急
速に速くなり、その間で加速された気泡は、慣性力によ
り上昇方向の運動量成分を持ち、サクションマウスには
極めて入り難くなる。しかし或る程度以上の気泡は、サ
クションマウス部には殆ど巻き込まれないが、それ以下
の気泡は巻き込まれる可能性がある。またサクションマ
ウス上部に、除去する気泡径以下のメッシュをもった金
網を設置した請求項２の場合は、更に微細な気泡も除去
できる。The flow of liquid containing bubbles rising inside the apparatus main body rapidly increases at a narrow portion between the outside of the suction mouth and the inner wall of the apparatus main body, and the bubbles accelerated during that time have an upward momentum component due to inertial force. And it becomes extremely difficult to enter the suction mouse. However, air bubbles of a certain degree or more are hardly entrained in the suction mouth portion, but air bubbles of a smaller size may be entrained. Further, in the case of claim 2 in which a wire mesh having a mesh smaller than the bubble diameter to be removed is provided above the suction mouth, finer bubbles can also be removed.
【０００８】[0008]
【実施例】以下本発明を図面の実施例について説明する
と、図１及び図２は本発明の実施例を示す。先ず図１の
第１実施例について説明すると、円筒形の装置本体１の
中に上部が漏斗状のサクションマウス２を内蔵してい
る。サクションマウス２は装置本体１の内面との間に、
上部の漏斗状部が狭隘部を形成し、同狭隘部に続く下部
は徐々に間隔が拡大し、下部は出口７に連通している。
また気泡を含む液体は、供給口３より供給され、サクシ
ョンマウス２の外側で流速が速くなるため気液が分離さ
れ、大きな気泡はサクションマウス２の上部へ浮上して
装置本体１上部の空気層４を形成する。また液体の一部
は循環パイプ５を通って装置本体１へ戻り、液体の大部
分はサクションマウス２を通って分離装置外へ排出さ
れ、所定の目的のために利用される。８は液体を循環さ
せるために循環パイプ５上に設けられた循環ポンプで、
装置本体１内で上昇流を生じさせる役割を持っている。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an embodiment of the present invention; FIG. First, the first embodiment of FIG. 1 will be described. A suction mouse 2 having a funnel-shaped upper part is built in a cylindrical device main body 1. The suction mouse 2 is located between the suction mouse 2 and the inner surface of the device body 1.
The upper funnel-shaped part forms a narrow part, and the lower part following the narrow part gradually increases the interval, and the lower part communicates with the outlet 7.
The liquid containing air bubbles is supplied from the supply port 3, and the flow velocity is increased outside the suction mouth 2, so that gas and liquid are separated, and large air bubbles float on the upper part of the suction mouth 2 to form an air layer above the apparatus main body 1. 4 is formed. In addition, a part of the liquid returns to the apparatus main body 1 through the circulation pipe 5, and most of the liquid is discharged out of the separation apparatus through the suction mouth 2 and is used for a predetermined purpose. 8 is a circulation pump provided on the circulation pipe 5 for circulating the liquid,
It has a role to generate an upward flow in the apparatus main body 1.
【０００９】さて図１において気泡を含む塗工液は、供
給口３より気液分離装置本体１に導入され、サクション
マウス２部で大きな気泡（直径３ｍｍ以上のもの）は上
昇し、それ以下の径の気泡を含む塗工液は、サクション
マウス２の内側を通って下降する。また装置本体１の上
部に浮上して溜まった気泡層４は、空気抜きパイプ６よ
り真空ポンプ９で抜き出す。一方塗工液の一部は、常に
循環パイプ５により装置本体１内を循環している。本実
施例で点Ｐ1 の位置の流速は、５ｃｍ／ｓｅｃである。
ここで点Ｐ1 は装置１のマウス２を取り外したときの空
塔速度を示す。また点Ｐ2 の流速は、２０ｃｍ／ｓｅｃ
とした。一方全供給流量は900 l/min であり、装置内の
循環パイプ５を循環している量は、全供給流量の５％
（45 l/min）とした。また供 給塗工液は、８ｖｏｌ％
で平均気泡径が２．５ｍｍであったものが、装置本体の
出口７では５ｖｏｌ％で平均気泡径は０．８ｍｍであっ
た。気泡層４の気圧はパイプ６より真空ポンプ９で空気
を抜き出すことにより若干（７００ｍｍＨｇ）減圧状態
にした。なお、コータ（紙仕上機械）の塗工液は、気泡
としては直径１ｍｍ以下で、４〜５ｖｏｌ％以下の気泡
率であれば、紙質上は全く問題がない。特に直径５ｍｍ
以上の気泡があれば、スキップという塗工液が紙に塗工
されていない箇所が存在するケースがある。In FIG. 1, the coating liquid containing air bubbles is introduced into the main body 1 of the gas-liquid separator from the supply port 3, and large air bubbles (those having a diameter of 3 mm or more) rise at the suction mouth 2 and rise below the suction mouth. The coating liquid containing bubbles having a diameter descends through the inside of the suction mouth 2. Further, the bubble layer 4 floating and accumulated at the upper part of the apparatus main body 1 is extracted from the air release pipe 6 by a vacuum pump 9. On the other hand, a part of the coating liquid is constantly circulating in the apparatus main body 1 by the circulation pipe 5. The flow rate of the position of the point P 1 in the present embodiment is 5 cm / sec.
Here, the point P 1 indicates the superficial velocity when the mouse 2 of the device 1 is removed. The flow rate at point P 2 is 20 cm / sec.
And On the other hand, the total supply flow rate is 900 l / min, and the amount circulating in the circulation pipe 5 in the apparatus is 5% of the total supply flow rate.
(45 l / min). The supplied coating liquid is 8 vol%
The average bubble diameter was 2.5 mm at the outlet 7 of the apparatus main body, and the average bubble diameter was 0.8 mm at 5 vol%. The pressure of the bubble layer 4 was slightly reduced (700 mmHg) by extracting air from the pipe 6 with a vacuum pump 9. The coating liquid of the coater (paper finishing machine) has no problem on the paper quality as long as the bubbles have a diameter of 1 mm or less and a bubble ratio of 4 to 5 vol% or less. Especially 5mm in diameter
If there are such bubbles, there may be a case where there is a portion of the paper where the coating liquid is not applied.
【００１０】図３にＰ1 の速度を５ｃｍ／ｓｅｃとした
場合と、４５ｃｍ／ｓｅｃとした場合にサクションマウ
ス２の径を変えた時のサクションマウス２の下部出口７
での気泡率を示す。なお、液体供給口３での条件は、前
述の通りで供給口３での気泡率は８ｖｏｌ％で、平均気
泡径は２．５ｍｍであった。また図２では、サクション
マウス２の漏斗状部の上面に、除去する気泡径以下のメ
ッシュを持った金網１０を設置したものであり、図１に
比べ更に微細な気泡を除去するようにしたものである。
次に図１を用いて行なった試験の結果、下記の点が判明
した。サクションマウスの径を大きくして、マウス外側
面の流速を上げると気液分離性は良くなる。またマウス
径を大きくすることにより循環液の吹込み流速が小さく
なり、気泡の吹込みが少なくなる。またサクションマウ
スの高さを高くすると、気泡の吹込みが少なくなる。FIG. 3 shows the lower outlet 7 of the suction mouse 2 when the diameter of the suction mouse 2 is changed when the speed of P 1 is 5 cm / sec and when the speed is 45 cm / sec.
Shows the bubble rate at. The conditions at the liquid supply port 3 were as described above, and the bubble rate at the supply port 3 was 8 vol% and the average bubble diameter was 2.5 mm. In FIG. 2, a wire mesh 10 having a mesh smaller than the bubble diameter to be removed is installed on the upper surface of the funnel-shaped portion of the suction mouth 2, so that finer bubbles are removed than in FIG. It is.
Next, as a result of a test performed using FIG. 1, the following points were found. When the diameter of the suction mouse is increased and the flow rate on the outer surface of the mouse is increased, the gas-liquid separation property is improved. Also, by increasing the diameter of the mouse, the flow velocity of the circulating fluid is reduced, and the blowing of bubbles is reduced. Also, when the height of the suction mouth is increased, the blowing of air bubbles is reduced.
【００１１】[0011]
【発明の効果】以上詳細に説明した如く本発明による
と、装置本体内を上昇する気泡を含む液体は、サクショ
ンマウスの漏斗状部と装置本体内面との間の狭隘部での
流速が急速に速くなり、その間で加速された気泡は、慣
性力により上昇方向の運動量成分を持ち、大きな気泡は
上昇してサクションマウスには入り難くなり、それ以下
の気泡を含む液体がサクションマウスを通って下部より
排出される。従って本発明によると、気液分離性を高め
ることができる。As described above in detail, according to the present invention, the liquid containing bubbles rising in the apparatus main body has a rapid flow velocity in the narrow portion between the funnel-shaped portion of the suction mouth and the inner surface of the apparatus main body. The bubbles accelerated during that time have a momentum component in the ascending direction due to the inertial force, large bubbles rise and it is difficult to enter the suction mouth, and liquid containing less bubbles passes through the suction mouth and lower Is more exhausted. Therefore, according to the present invention, gas-liquid separation properties can be improved.
【図１】本発明の第１実施例を示す脱泡装置の縦断面図
である。FIG. 1 is a longitudinal sectional view of a defoaming apparatus showing a first embodiment of the present invention.
【図２】本発明の第２実施例を示す脱泡装置の縦断面図
である。FIG. 2 is a longitudinal sectional view of a defoaming apparatus showing a second embodiment of the present invention.
【図３】本発明における狭隘部の流速とサクションマウ
スの下部出口部での気泡率との関係を示す線図である。FIG. 3 is a diagram showing the relationship between the flow velocity in a narrow portion and the air bubble ratio at the lower outlet of a suction mouth in the present invention.
【図４】従来の気液分離装置の１例を示す縦断面図であ
る。FIG. 4 is a longitudinal sectional view showing an example of a conventional gas-liquid separation device.
【図５】従来の図４と異なる気液分離装置の縦断面図で
ある。FIG. 5 is a longitudinal sectional view of a conventional gas-liquid separation device different from FIG.
１ 分離装置本体 ２ サクションマウス ３ 供給口 ４ 空気層 ５ 循環パイプ ６ 空気抜き用パイプ ７ 装置本体の出口 ８ 循環ポンプ ９ 真空ポンプ １０ 金網 DESCRIPTION OF SYMBOLS 1 Separation apparatus main body 2 Suction mouth 3 Supply port 4 Air layer 5 Circulation pipe 6 Air vent pipe 7 Outlet of apparatus main body 8 Circulation pump 9 Vacuum pump 10 Wire mesh
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) B01D 19/00 ──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. 7 , DB name) B01D 19/00
Claims (2)
プを備えた脱泡装置であって、 装置本体の内部に、上面が液体中に開口するとともに、
下部に前記装置本体の外部に連通する液排出口を有し、
当該液排出口側から上方に向けて前記装置本体の内面と
の間隔が徐々に縮小する漏斗状のサクションマウスが設
けられて、前記サクションマウスは、漏斗状の部分の上
部にて、前記装置本体内面との間に、前記液体供給口か
ら前記装置本体の内部に供給された液体の流速を増加さ
せる狭隘部を形成し、 前記装置本体の側部に、前記狭隘部を通過した液体を前
記狭隘部の上流側にて前記装置本体に循環させる液体循
環手段が設けられている ことを特徴とする脱泡装置。1. A liquid supply port at a lower part and an air vent pie at an upper part.
A defoaming device provided with a pump , wherein an upper surface opens into a liquid inside the device main body,
At the bottom has a liquid discharge port communicating with the outside of the device main body,
From the liquid outlet side to the inner surface of the device body
A funnel-shaped suction mouse that gradually reduces the space between
The suction mouse is moved over the funnel-shaped part.
Between the liquid supply port and the inner surface of the apparatus main body.
Increase the flow rate of the liquid supplied to the inside of the apparatus main body.
A narrow portion is formed so that the liquid that has passed through the narrow portion is
The liquid circulating through the apparatus body upstream of the narrow portion
A defoaming device comprising a ring means .
る気泡径以下のメッシュを持った金網を設置したことを
特徴とする請求項１記載の脱泡装置。2. The defoaming apparatus according to claim 1, wherein a wire net having a mesh smaller than the diameter of the bubble to be removed is provided above the suction mouth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05807393A JP3202391B2 (en) | 1993-02-24 | 1993-02-24 | Defoaming device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05807393A JP3202391B2 (en) | 1993-02-24 | 1993-02-24 | Defoaming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06246105A JPH06246105A (en) | 1994-09-06 |
| JP3202391B2 true JP3202391B2 (en) | 2001-08-27 |
Family
ID=13073742
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05807393A Expired - Fee Related JP3202391B2 (en) | 1993-02-24 | 1993-02-24 | Defoaming device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3202391B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7067204B2 (en) | 2002-04-01 | 2006-06-27 | National University Corporation Ehime University | Submerged plasma generator, method of generating plasma in liquid and method of decomposing toxic substance with plasma in liquid |
| KR101964830B1 (en) * | 2018-08-23 | 2019-08-07 | 이에스피 주식회사 | Water treatment apparatus |
| KR101964832B1 (en) * | 2018-08-23 | 2019-04-02 | 이에스피 주식회사 | Water treatment apparatus |
-
1993
- 1993-02-24 JP JP05807393A patent/JP3202391B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JPH06246105A (en) | 1994-09-06 |
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