JPH0780427A - Method of cleaning pipe and its device - Google Patents

Method of cleaning pipe and its device

Info

Publication number
JPH0780427A
JPH0780427A JP5224637A JP22463793A JPH0780427A JP H0780427 A JPH0780427 A JP H0780427A JP 5224637 A JP5224637 A JP 5224637A JP 22463793 A JP22463793 A JP 22463793A JP H0780427 A JPH0780427 A JP H0780427A
Authority
JP
Japan
Prior art keywords
inlet
outlet
liquid
water
flow
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
Application number
JP5224637A
Other languages
Japanese (ja)
Other versions
JP3340525B2 (en
Inventor
Isao Kitagawa
勲 北川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KITAGAWA KOTOMI
Original Assignee
KITAGAWA KOTOMI
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by KITAGAWA KOTOMI filed Critical KITAGAWA KOTOMI
Priority to JP22463793A priority Critical patent/JP3340525B2/en
Publication of JPH0780427A publication Critical patent/JPH0780427A/en
Application granted granted Critical
Publication of JP3340525B2 publication Critical patent/JP3340525B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PURPOSE:To provide a pipe cleaning method and its device for switching a liquid from a forward running direction to a reversed running direction or vice versa, then accelerating the formation of bubbles in a pipe by injecting a gas into the liquid and cleaning the pipe inner wall efficiently by impacts generated by the collapse of the bubbles. CONSTITUTION:The flow direction of a liquid is switched from forward to reversed or vice versa in a pipe, and at the same time, bubbles are formed in the pipe by injecting a gas into the liquid, if the liquid is set in the forward flow direction and the reversed flow direction. After that, impurities sticking to the inner wall of the pipe wall 15 are removed by impacts generated by the collapse of the bubbles.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、内部に液体が流通する
管路を備えた例えば熱交換器等の液体使用機器に接続し
て、その管路内壁に付着するスケール等を好適に除去し
得る管路の洗浄方法及びその装置に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for removing scales or the like adhering to the inner wall of a pipe by connecting to a liquid-using device such as a heat exchanger having a pipe through which a liquid flows. The present invention relates to a method for cleaning a pipeline and a device for the same.

【0002】[0002]

【従来の技術】水等の液体が流通する管路を具備した水
使用機器としては、例えば冷却水の循環管路を備えた鋳
型や、各種の熱交換器等多岐にわたって提供されてい
る。このような水使用機器においては、管路の液体入口
から出口に向けて水を流通させて、鋳込みによって温度
が上昇した鋳型を冷却させたり、使用後の水の熱交換を
させたりしているのが一般的である。
2. Description of the Related Art As water-using equipment provided with a pipe through which a liquid such as water flows, there are provided a wide variety of devices such as a mold provided with a circulation pipe for cooling water and various heat exchangers. In such a water-using device, water is circulated from the liquid inlet of the pipeline toward the outlet to cool the mold whose temperature has risen due to casting, or to perform heat exchange of water after use. Is common.

【0003】しかしながら、上記の如く管路に水を流通
させた場合、水使用機器での水の流れ方向が、入口から
出口に向けて一方向のみとなっているために、水の循環
管路内における継手の段差部分や他の屈曲部分(例えば
エルボ,ベンド等)の内壁においてスケール等の不純物
が付着し、これが堆積されて水の流路が狭くなる等の問
題があった。また、水使用機器が鋳型等の加熱される機
器であって、その内部にこれを冷却するための冷却水循
環管路が形成されている場合には、冷却水の入口近くは
充分に冷却されるものの、出口近くになるにしたがって
冷却水が順次加熱されるために充分な冷却ができないと
いう問題もあった。これは循環する水によって逆に加熱
する機器の場合も、入口近くは充分に加熱されるが出口
近くは加熱が不充分になって同様な結果となる。
However, when the water is circulated in the pipeline as described above, the flow direction of the water in the water-using device is only one direction from the inlet to the outlet, and therefore the water circulation pipeline. There is a problem that impurities such as scale adhere to the inner wall of the stepped portion of the joint and other bent portions (for example, elbows, bends, etc.) and are accumulated to narrow the water flow path. Further, when the water-using device is a device such as a mold to be heated and a cooling water circulation pipe line for cooling the device is formed therein, the vicinity of the cooling water inlet is sufficiently cooled. However, there is a problem that the cooling water cannot be sufficiently cooled because the cooling water is sequentially heated near the outlet. In the case of a device that is heated inversely by circulating water, this is the same as that near the inlet is sufficiently heated, but near the outlet is insufficiently heated.

【0004】このような不都合を解決すべく、例えば本
発明者は先に実開平2─110770号公報において
『水流切換装置』を開示している。この水流切換装置に
よれば、水使用機器内での水の流れ方向を正方向及び逆
方向に切り換えて、正方向の水の流れによって付着した
不純物を逆方向の水の流れによって剥離させるととも
に、水によって水使用機器を冷却又は加熱する場合に
も、水の入口と出口が逆転されることによって均一な冷
却又は加熱をなすことができる。また、水使用機器内で
水の流れ方向を正逆切り換えると、この流れの正逆切り
換えに使用する切換弁の種類によっては、切換時に水流
の急変があって水撃作用(ウォーターハンマー)が生じ
るが、この水流切換装置にあっては、これに設けた入口
及び出口側選択弁が、水の入口,出口,第一及び第二出
入口を相互に連通させるリークモードを構成して水使用
機器との間で水の移動をなくし、これによって水撃作用
を防止している。
In order to solve such inconvenience, for example, the present inventor has previously disclosed a "water flow switching device" in Japanese Utility Model Laid-Open No. 2-110770. According to this water flow switching device, the flow direction of water in the water using device is switched between the forward direction and the reverse direction, and the impurities attached by the forward water flow are separated by the reverse water flow, and Even when the water-using device is cooled or heated by water, the inlet and the outlet of the water are reversed, so that uniform cooling or heating can be performed. In addition, when the water flow direction is switched between normal and reverse in the equipment using water, depending on the type of the switching valve used for the normal and reverse switching of the flow, there is a sudden change in the flow of water at the time of switching and a water hammer effect (water hammer) occurs. However, in this water flow switching device, the inlet and outlet side selection valves provided in the water flow switching device constitute a leak mode in which the water inlet, outlet, first and second inlets and outlets are in communication with each other, and are used as water-using equipment. The movement of water between them is eliminated, thereby preventing the water hammer effect.

【0005】[0005]

【発明が解決しようとする課題】ところで、上記水流切
換装置においては、不純物の除去,一様な冷却又は加熱
効果,水撃作用の防止に関しては性能的に全く問題点は
ないが、特に管路内壁に付着した不純物が経時に連れて
堆積した場合、単に水の流れ方向を切り換えるだけで
は、その堆積した不純物を充分に剥離できないといった
不都合があった。
By the way, in the above water flow switching device, there is no problem in performance regarding removal of impurities, uniform cooling or heating effect, and prevention of water hammer action, but especially the pipe line. When the impurities adhering to the inner wall are deposited with the passage of time, there is a disadvantage that the deposited impurities cannot be sufficiently separated by simply switching the flow direction of water.

【0006】本発明は、上記の不都合を解決し得るもの
であって、その目的は、液体を正逆に切り換えるととも
に、この液体に気体を注入して管路内で気泡の形成を促
進させ、この気泡の壊滅時の衝撃によって管路内壁を良
好に洗浄し得る管路の洗浄方法及びその装置を提供する
ことにある。
The present invention can solve the above-mentioned inconveniences, and its purpose is to switch a liquid between normal and reverse directions and to inject a gas into the liquid to promote the formation of bubbles in a pipe line. It is an object of the present invention to provide a method for cleaning a pipeline and an apparatus for cleaning the inside wall of the pipeline satisfactorily by the impact when the bubbles are destroyed.

【0007】[0007]

【課題を解決するための手段】本発明の管路の洗浄方法
及びその装置のうち、請求項1に記載のものは、管路で
液体の流れ方向を正方向及び逆方向に切り換えるととも
に、液体の流れが正方向のとき及び逆方向のときに、そ
れぞれこの液体に向けて気体を注入して管路内に気泡を
形成させ、その後の気泡の壊滅時に発生する衝撃によっ
て前記管路内壁に付着した不純物を除去することを特徴
とする。
Among the methods and apparatus for cleaning a pipe of the present invention, the one described in claim 1 is characterized in that the flow direction of the liquid is switched to the forward direction and the reverse direction in the pipe, and When the flow is in the forward direction and in the reverse direction, gas is injected toward the liquid to form bubbles in the pipeline, and the bubbles are adhered to the inner wall of the pipeline by the impact generated when the bubbles collapse. It is characterized in that the removed impurities are removed.

【0008】また、請求項2に記載のものは、弁本体
に、液体の供給源に連続する入口と、液体の排出先に連
続する出口と、これら入口及び出口に連通しかつ液体使
用機器に連続する第一及び第二出入口と、前記入口から
入った液体の流れの向きを前記第一出入口と第二出入口
とこれらの両方とのいずれかに選択する入口側選択弁
と、前記出口に向かう液体の流れの通過部として前記第
一出入口と第二出入口とこれらの両方とのいずれかを選
択する出口側選択弁とを設けるとともに、前記入口側選
択弁の第一出入口選択時に出口側選択弁が第二出入口を
選択する正流モードと、前記入口側選択弁の第二出入口
選択時に出口側選択弁が第一出入口を選択する逆流モー
ドとに切り換える開閉切換機構を設け、さらに前記液体
の供給源と前記入口側選択弁との間の流路に気体を注入
する注入機構を設けたことを特徴とする。
According to a second aspect of the present invention, the valve body is provided with an inlet connected to a liquid supply source, an outlet connected to a liquid discharge destination, and an inlet connected to the inlet and the outlet, and a device using the liquid. A continuous first and second inlet / outlet, an inlet-side selection valve for selecting the direction of the flow of the liquid entering from the inlet to either the first inlet / outlet, the second inlet / outlet, or both, and to the outlet. An outlet-side selection valve that selects either the first inlet / outlet, the second inlet / outlet, or both as a passage for the liquid flow is provided, and the outlet-side selection valve is selected when the first inlet / outlet of the inlet-side selection valve is selected. Is provided with an open / close switching mechanism for switching between a forward flow mode in which the second inlet / outlet is selected and a reverse flow mode in which the outlet-side selection valve selects the first inlet / outlet when the second inlet / outlet of the inlet-side selection valve is selected. Source and the entrance side Characterized by providing an injection mechanism for injecting a gas in a flow path between the 択弁.

【0009】[0009]

【作用】本発明の管路の洗浄方法及びその装置のうち、
請求項1に記載のものによれば、液体の流れ方向を正方
向から逆方向に切り換えると、流れの反転による液体の
抵抗の増加によって管路内壁に付着した不純物が除去さ
れるとともに、液体の流れが正方向のとき及び逆方向の
ときに、それぞれこの液体に向けて気体を注入している
ため、逆方向に流れる液体の先端で気泡の形成が促進さ
れ、この気泡が壊滅する時に発生する衝撃によって管路
内壁に堆積した不純物を剥離する。ここで、前記気泡の
発生,壊滅が急激に繰り返される現象(所謂キャビテー
ション)は、管路内において流れの圧力が極度に低下す
る部分、例えば液体に働いている静圧の低下と、管路内
を流れる液体の流速に伴う圧力の低下とが局所的に同時
に起こるような部分があると、この部分で液体が瞬間的
に沸騰して気泡を生じ、その直後にこの気泡は、より圧
力の高い部分に運ばれて壊滅するといった動力学的な現
象であって、前記気泡の発生から壊滅までの時間は約1
/1000秒程度の極めて大きい速度であることが確認
されている。また、液体には、通常多かれ少なかれ種々
の物質が溶解されているが、殊に気体が溶解されている
と、キャビテーションの発生は促進される傾向がある。
Among the method and apparatus for cleaning a pipeline of the present invention,
According to the first aspect of the present invention, when the flow direction of the liquid is switched from the forward direction to the reverse direction, impurities adhering to the inner wall of the conduit are removed due to the increase in the resistance of the liquid due to the reversal of the flow, and the liquid When the flow is in the forward direction and in the reverse direction, the gas is injected toward the liquid, so that the formation of bubbles is promoted at the tip of the liquid flowing in the opposite direction, and the bubbles are destroyed when they collapse. Impurities that have accumulated on the inner wall of the pipe due to impact are peeled off. Here, the phenomenon in which the generation and destruction of the bubbles is rapidly repeated (so-called cavitation) is caused by a portion where the pressure of the flow extremely decreases in the pipe, for example, a decrease in static pressure acting on the liquid and the inside of the pipe. If there is a portion where the pressure drop due to the flow velocity of the liquid flowing locally simultaneously occurs, the liquid will boil instantaneously in this portion to form a bubble, and immediately thereafter, this bubble has a higher pressure. It is a dynamic phenomenon that it is carried to a part and destroyed, and the time from the generation of the bubbles to the destruction is about 1
It has been confirmed that the speed is extremely large, about 1000 seconds. In addition, various substances are usually dissolved in the liquid, but more or less various substances are dissolved therein. In particular, when gas is dissolved, the occurrence of cavitation tends to be accelerated.

【0010】本発明では、液体の流れを正逆切り換えた
後に、その液体の境界部分で生じる圧力差と、液体の流
れが正方向のとき及び逆方向のときに、それぞれこの液
体に向けて注入した気体との影響によって、液体の分子
運動が活発化され、前記境界部分において気泡の形成が
促進される。この気泡は、流れ方向の切り換え後に流れ
る液体の移動に伴い、その流れの先端では形成,壊滅を
短時間に繰り返し、壊滅時に発生する衝撃によって管路
内壁に堆積した不純物を剥離する。換言すれば、流れ方
向を切り換えた後の液体は、その流れの先端で気泡の形
成,壊滅を繰り返しながら管路内を移動し、この気泡の
壊滅時に発生する衝撃によって管路内壁に付着した不純
物を剥離する。このように、キャビテーションを利用す
ることで、単に流れ方向を切り換えるだけでは充分に剥
離しきれなかった管路内壁の不純物をも剥離し、管路内
壁を良好に洗浄することが可能となる。
According to the present invention, after the liquid flow is switched between normal and reverse directions, the pressure difference generated at the boundary part of the liquid and when the liquid flow is in the forward direction and the reverse direction, the liquid is injected toward the liquid. Due to the influence of the generated gas, the molecular motion of the liquid is activated and the formation of bubbles is promoted at the boundary portion. The bubbles repeat formation and destruction at the tip of the flow in a short time with the movement of the flowing liquid after the switching of the flow direction, and the impurities accumulated on the inner wall of the conduit are peeled off by the impact generated at the time of the destruction. In other words, the liquid after switching the flow direction moves in the pipeline while repeatedly forming and destroying bubbles at the tip of the flow, and the impurities generated on the inner wall of the pipeline by the impact generated when the bubbles are destroyed. Peel off. As described above, by utilizing cavitation, impurities on the inner wall of the conduit that could not be sufficiently separated by simply switching the flow direction can be separated, and the inner wall of the conduit can be cleaned well.

【0011】また、請求項2に記載のものによれば、洗
浄装置の入口に液体の供給源からの液体が入り、この液
体は、その第一及び第二出入口の一方から液体使用機器
の二つの出入口の一方に供給され、ここで循環して所定
の仕事をした後に、液体使用機器の他方の出入口から出
て洗浄装置の他方の出入口に入り、この液体はさらに洗
浄装置の出口から出る。この際、液体の供給源と入口側
選択弁との間の流路では、注入機構によって液体に気体
が注入されている。
According to the second aspect of the present invention, the liquid from the liquid supply source enters the inlet of the cleaning device, and the liquid is supplied from one of the first and second inlets and outlets of the liquid using equipment. It is supplied to one of the two inlets and outlets, circulates there and performs a predetermined work, and then exits from the other inlet and outlet of the liquid using device and enters the other inlet and outlet of the cleaning device, and the liquid further exits from the outlet of the cleaning device. At this time, gas is injected into the liquid by the injection mechanism in the flow path between the liquid supply source and the inlet side selection valve.

【0012】ここで、開閉切換機構によって、入口側選
択弁が第一出入口を選択しかつ出口側選択弁が第二出入
口を選択して正流モードになると、洗浄装置の入口から
入った液体は第一出入口から液体使用機器の一方の出入
口に供給され、液体使用機器内を循環してその他方の出
入口から洗浄装置に第二出入口に入り、さらに出口から
流出する。次に開閉切換機構によって入口側選択弁が第
二出入口を選択して逆流モードにすると、、洗浄装置の
入口から入った液体は第二出入口から液体使用機器の正
流モードでは出口であった出入口に供給されてここから
液体使用機器内を循環して他方の出入口から出て、洗浄
装置にはその第一出入口に入り、さらに出口から流出す
る。
When the inlet-side selection valve selects the first inlet / outlet and the outlet-side selection valve selects the second inlet / outlet by the open / close switching mechanism to enter the forward flow mode, the liquid entering from the inlet of the cleaning device is The liquid is supplied from the first inlet / outlet to one inlet / outlet of the liquid using device, circulates in the liquid using device, enters the second inlet / outlet of the cleaning device from the other inlet / outlet, and further flows out from the outlet. Next, when the inlet side selection valve selects the second inlet / outlet by the open / close switching mechanism and the backflow mode is set, the liquid entering from the inlet of the cleaning device is the outlet from the second inlet / outlet in the normal flow mode of the liquid using device. Is supplied to the cleaning device, circulates in the liquid-using device, exits from the other inlet / outlet port, enters the first inlet / outlet port of the cleaning device, and further flows out from the outlet port.

【0013】このようにして、正流モードと逆流モード
とでは第一及び第二出入口での液体の出入り方向が逆転
して、液体使用機器での液体の流れ方向が逆転し、液体
使用機器でこれまでの液体の入口と出口が逆になる。こ
のため、管路内壁に堆積したスケール等の不純物が逆方
向の液体の流れによって除去されるとともに、注入機構
から注入した気体によって液体内での気泡の発生が促進
され、この気泡の壊滅時に発生する衝撃によっても管路
内壁に堆積した不純物が剥離された後、液体使用機器外
へ排出される。また、液体使用機器を液体によって冷却
又は加熱する場合にも、液体の入口と出口が反覆して逆
転されることによって管路の温度が均一になり、したが
って冷却又は加熱が一様になされる。
In this way, in the forward flow mode and the reverse flow mode, the liquid inflow and outflow directions at the first and second inlets and outlets are reversed, and the liquid flow directions in the liquid using equipment are reversed, so that the liquid using equipment is The previous liquid inlet and outlet are reversed. Therefore, impurities such as scale accumulated on the inner wall of the pipe are removed by the flow of the liquid in the opposite direction, and the gas injected from the injection mechanism promotes the generation of bubbles in the liquid, which are generated when the bubbles are destroyed. The impact also causes the impurities accumulated on the inner wall of the pipe to be peeled off, and then discharged to the outside of the device using the liquid. Also, when the liquid-using device is cooled or heated by the liquid, the inlet and outlet of the liquid are reversed to be reversed, so that the temperature of the pipeline becomes uniform and therefore the cooling or heating becomes uniform.

【0014】[0014]

【実施例】以下、本発明の実施例を図面を参照して詳細
に説明する。図1は本発明の概要を示す回路図であっ
て、符号1は洗浄装置を示しており、この洗浄装置1に
金型,オイルクーラーその他の水使用機器2が接続され
て往復循環装置が構成されている。
Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a circuit diagram showing an outline of the present invention. Reference numeral 1 indicates a cleaning device, and a mold, an oil cooler and other water using equipment 2 are connected to the cleaning device 1 to form a reciprocating circulation device. Has been done.

【0015】洗浄装置1は、図1において一点鎖線で仮
想的に示した弁本体に、水の供給源3にポンプPを介し
て連続する入口4と、水の排出先に連続する(本実施例
では供給源3に戻る)出口5と、これら入口4及び出口
5に連通しかつ水使用機器2に連続する第一出入口6及
び第二出入口7とを備えている。また、前記出口5と供
給源3との間には濾過器8が介在する。なお、前記ポン
プPは、水流のための水圧を得ることができれば他の位
置であってもよい。
The cleaning device 1 is connected to a valve body, which is virtually shown by a one-dot chain line in FIG. 1, at an inlet 4 which is continuous to a water supply source 3 via a pump P and at a water discharge destination (this embodiment). In the example, it returns to the supply source 3), an outlet 5, and a first inlet 6 and a second inlet 7 which communicate with the inlet 4 and the outlet 5 and are continuous with the water using device 2. Further, a filter 8 is interposed between the outlet 5 and the supply source 3. The pump P may be located at another position as long as it can obtain the water pressure for the water flow.

【0016】さらに弁本体内には、前記入口4と、第一
及び第二出入口6,7との間に介在して、入口4から入
った水流の向きを、第一出入口6と、第二出入口7と、
これら両方6,7とのいずれかに選択する電動式の入口
側選択弁Aが配設される一方、前記出口5と、第一及び
第二出入口6,7との間に介在して、出口5に向かう水
流の通過部として、第一出入口6と、第二出入口7と、
これら両方6,7とのいずれかに選択する電動式の出口
側選択弁Bが配設されている。これら入口側選択弁A
と、出口側選択弁Bとの開閉は、相互に逆位相となって
おり、かつ両選択弁A,Bの開閉動作は同期されてい
る。かかる逆位相での同期動作は、開閉切換機構9によ
って行われる。
Further, in the valve body, the water flow entering from the inlet 4 is directed between the first inlet 6 and the second inlet 6 by interposing between the inlet 4 and the first and second outlets 6 and 7. Doorway 7,
An electric inlet side selection valve A for selecting either of these 6 and 7 is arranged, while the outlet 5 is interposed between the outlet 5 and the first and second inlets and outlets 6 and 7. As a passage for the water flow toward 5, a first doorway 6, a second doorway 7,
An electric outlet side selection valve B for selecting either of these 6 and 7 is provided. These inlet side selection valves A
And the outlet side selection valve B are opened and closed in opposite phases to each other, and the opening and closing operations of both the selection valves A and B are synchronized. The open / close switching mechanism 9 performs the synchronizing operation in the opposite phase.

【0017】この開閉切換機構9は、本実施例において
は電動式モータMによる自動切換機構を採用しており、
その操作部には、モータMの電源をON−OFFする電
源釦と、開閉切換機構9に内蔵した水流切換タイマの設
定に基づき入口側選択弁A及び出口側選択弁Bを開閉す
る水流切換モード,及び入口側選択弁A及び出口側選択
弁Bの開閉動作を停止させるOFFモード,及び後述す
る注入機構を作動させる洗浄モードとに切り換える切換
スイッチと、この切換スイッチのモードに基づき所定の
装置を起動させる起動釦及びその起動を停止させる停止
釦が設けられ、さらに入口側選択弁A及び出口側選択弁
Bの開閉の基づく水流の正逆方向を点灯する正流ラン
プ,逆流ランプと、モータMの異常時に点灯する異常ラ
ンプ等が設けられ、さらに前記水流切換タイマの設定を
行う第一設定部と、後述する注入機構のインパクトタイ
マの設定を行う第二設定部が設けられている。なお、こ
の操作部には、必要に応じて他の機能を追加してもよ
い。
The open / close switching mechanism 9 employs an automatic switching mechanism using an electric motor M in this embodiment.
A power button for turning the power of the motor M on and off, and a water flow switching mode for opening and closing the inlet side selection valve A and the outlet side selection valve B based on the setting of the water flow switching timer built in the opening / closing switching mechanism 9 are provided in the operation section. , An OFF mode for stopping the opening / closing operations of the inlet side selection valve A and the outlet side selection valve B, and a cleaning mode for operating an injection mechanism described later, and a predetermined device based on the mode of the switching switch. A start button for starting and a stop button for stopping the start are provided, and further, a forward flow lamp and a reverse flow lamp for lighting the forward and reverse directions of the water flow based on the opening and closing of the inlet side selection valve A and the outlet side selection valve B, and the motor M. An abnormal lamp that lights up when an abnormality occurs, and a second setting unit that sets the impact timer of the injection mechanism, which will be described later, and a first setting unit that sets the water flow switching timer. Tough is provided. Note that other functions may be added to this operation unit as necessary.

【0018】また、前記入口4と、入口側選択弁Aとの
間には、これらを接続する管路の一部として混合管21
が組み込まれており、この混合管21には注入機構22
が接続されている。注入機構22は、入口4から入った
水に向けて気体を注入するものであって、その詳細分解
図を図5に示すように、混合管21に設けた枝管21a
に逆止弁22が接続され、この逆止弁22にミニチュア
バルブ23が接続され、このミニチュアバルブ23に継
手24及びチューブ25を介して電磁弁26が接続さ
れ、さらにこの電磁弁26に気体の供給源27が接続さ
れたものである。これらの構成部材のうち、電磁弁26
には図示しないインパクトタイマが内蔵されており、こ
のインパクトタイマによって電磁弁26が間欠的に開閉
するようになっている。なお、インパクトタイマの設定
は前記第二設定部によって行い、前記管路の径及びこの
管路を流れる水の流量等の条件にて設定時間を決定す
る。
Further, between the inlet 4 and the inlet side selection valve A, a mixing pipe 21 is formed as a part of a pipe line connecting them.
Is incorporated into the mixing pipe 21.
Are connected. The injection mechanism 22 is for injecting gas toward the water entering from the inlet 4, and a detailed exploded view of the injection mechanism 22 is shown in FIG.
Is connected to a check valve 22, a miniature valve 23 is connected to the check valve 22, a solenoid valve 26 is connected to the miniature valve 23 via a joint 24 and a tube 25, and a gas is connected to the solenoid valve 26. The supply source 27 is connected. Of these components, the solenoid valve 26
Has a built-in impact timer (not shown), and the impact timer causes the solenoid valve 26 to open and close intermittently. The impact timer is set by the second setting unit, and the set time is determined by conditions such as the diameter of the pipe and the flow rate of water flowing through the pipe.

【0019】一方、前記水使用機器2における水の循環
管路15の両端に形成される第一出入口16と第二出入
口17には、洗浄装置1の前記第一出入口6と第二出入
口7とに設けた図1では図示しない継手によってそれぞ
れ個別に連結されている。次に、上記のように構成され
た洗浄装置1を用いて水使用機器2内の循環管路15の
内部を洗浄する方法について説明する。
On the other hand, the first inlet / outlet port 16 and the second inlet / outlet port 17 formed at both ends of the water circulation pipe 15 in the water using device 2 have the first inlet / outlet port 6 and the second inlet / outlet port 7 of the cleaning apparatus 1, respectively. In FIG. 1, the joints are not connected to each other and are individually connected. Next, a method of cleaning the inside of the circulation pipeline 15 in the water using device 2 using the cleaning device 1 configured as described above will be described.

【0020】先ず、前記第一及び第二設定部にて水流切
換タイマとインパクトタイマの時間設定を行った後、開
閉切換機構9の操作部の切換スイッチを水流切換モード
とする。これによって、ポンプPが供給源3から洗浄装
置1へと送水し、入口4に入った水は、入口側選択弁A
の一方の出口A1 と出口側選択弁Bの他方の入口B2
が開き、かつ入口側選択弁Aの他方の出口A2 と出口側
選択弁Bの一方の入口B1 とが閉じているときには、入
口側選択弁Aが第一出入口6を選択しかつ出口側選択弁
Bが第二出入口7を選択している正流モードであって、
水は図2に示すように流れる。すなわち、第一出入口6
から水使用機器2の第一出入口16に入り、循環管路1
5を矢印Xの方向に循環して第二出入口17から出た
後、洗浄装置1の第二出入口7に入り出口5から出て、
濾過器8を経て供給源3に戻る。
First, after setting the time of the water flow switching timer and the impact timer in the first and second setting portions, the changeover switch of the operation portion of the open / close switching mechanism 9 is set to the water flow switching mode. As a result, the pump P sends water from the supply source 3 to the cleaning device 1, and the water that has entered the inlet 4 has the inlet side selection valve A
One outlet A 1 and the other inlet B 2 of the outlet side selection valve B are opened, and the other outlet A 2 of the inlet side selection valve A and one inlet B 1 of the outlet side selection valve B are closed. Is in the forward flow mode in which the inlet side selection valve A selects the first inlet / outlet 6 and the outlet side selection valve B selects the second inlet / outlet 7,
Water flows as shown in FIG. That is, the first doorway 6
To the first inlet / outlet 16 of the water using device 2 from the circulation line 1
5 is circulated in the direction of arrow X and exits from the second entrance / exit 17, and then enters the second entrance / exit 7 of the cleaning apparatus 1 and exits from the exit 5,
Return to the supply source 3 via the filter 8.

【0021】ここで、水流切換タイマの設定に基づき、
入口側選択弁Aと出口側選択弁Bとの開閉が上記とは逆
になって、入口側選択弁Aが第二出入口7を選択しかつ
出口側選択弁Bが第一出入口6を選択した逆流モードの
場合には、その水の流れを図3に示すように、洗浄装置
1の第二出入口7から水がでて水使用機器2の第二出入
口17に入り、矢印Yの方向に循環して第一出入口16
から洗浄装置1の第一出入口6に入り、さらに出口5か
ら出る。したがって、開閉切換機構9による入口側選択
弁Aと出口側選択弁Bとの切り換えによって水使用機器
2の循環管路15内での循環方向が逆転する。
Here, based on the setting of the water flow switching timer,
The opening and closing of the inlet side selection valve A and the outlet side selection valve B are opposite to the above, and the inlet side selection valve A selects the second inlet / outlet 7 and the outlet side selection valve B selects the first inlet / outlet 6. In the case of the backflow mode, as shown in FIG. 3, the water flows out from the second inlet / outlet 7 of the cleaning device 1 into the second inlet / outlet 17 of the water using device 2 and circulates in the direction of the arrow Y. Then the first doorway 16
To the first inlet / outlet 6 of the cleaning device 1 and further from the outlet 5. Therefore, by switching between the inlet side selection valve A and the outlet side selection valve B by the opening / closing switching mechanism 9, the circulation direction in the circulation pipe line 15 of the water using device 2 is reversed.

【0022】この場合、前記正流モードと逆流モードと
の切り換え時には、切り換え途中でリークモードになっ
て、水は図4に示すように流れる。すなわち、入口4か
ら入った水は入口側選択弁Aの出口A1 及び出口A2
両方から流れ出て、出口A1から流れ出た水は第一出入
口6へは流れずに出口側選択弁Bの入口B1 へと流れ、
かつ出口A2 から流れ出た水は第二出入口7へは流れず
に出口側選択弁Bの入口B2 へと流れ、洗浄装置1内の
みを循環して出口5から出る。このとき、水使用機器2
には水が往復せず、循環管路15内で水は一旦静止した
状態になるので、前記切り換えによる水撃作用を起こす
ことがない。
In this case, at the time of switching between the forward flow mode and the reverse flow mode, the leak mode is set during the switching, and the water flows as shown in FIG. That is, the water entering from the inlet 4 flows out from both the outlet A 1 and the outlet A 2 of the inlet side selection valve A, and the water flowing out from the outlet A 1 does not flow to the first inlet / outlet 6 but the outlet side selection valve B. To the entrance B 1 of
Moreover, the water flowing out from the outlet A 2 does not flow into the second inlet / outlet 7 but flows into the inlet B 2 of the outlet side selection valve B, circulates only in the cleaning device 1 and exits from the outlet 5. At this time, water-using device 2
Since the water does not reciprocate, the water temporarily stops in the circulation pipe line 15, so that the water hammer action due to the switching does not occur.

【0023】ここで、前記操作部の切換スイッチを洗浄
モードにすると、水流切換タイマが作動しつつインパク
トタイマも作動し、このインパクトタイマの設定に基づ
き電磁弁26が間欠的に作動する。すなわち、気体の供
給源27から電磁弁26へと気体が供給され、この電磁
弁26から混合管21へ向けて間欠的に気体を送り込
む。この際、気体を送る圧力は、管路を流れる水の圧力
より高い圧力であるものとする。なお、前記気体は、空
気,炭酸ガス,窒素ガス等危険性を伴わないものであれ
ば何でもよいが、一般には安価であってかつ簡素な空気
を使用するのがよい。
When the changeover switch of the operation section is set to the washing mode, the water flow changeover timer operates while the impact timer also operates, and the solenoid valve 26 operates intermittently based on the setting of the impact timer. That is, the gas is supplied from the gas supply source 27 to the electromagnetic valve 26, and the gas is intermittently sent from the electromagnetic valve 26 toward the mixing pipe 21. At this time, the pressure for sending the gas is assumed to be higher than the pressure of the water flowing through the pipeline. The gas may be air, carbon dioxide gas, nitrogen gas or the like as long as it is not dangerous, but generally, it is preferable to use simple and inexpensive air.

【0024】このようにして水に気体を注入すると、こ
の気体によって水の分子運動が活発化され、そのときの
水が低温であったとしても気泡が発生しやすくなる。こ
の状態にある水を、前記正流モード及び逆流モードで所
定間隔おきに流通させると、正流モードで流した水と、
次に逆流モードで流した水との境界部分では圧力差が生
じ、さらに逆流モードで流した水の先端では気体の注入
によって水の分子運動が活発化されているので、この逆
流モードで流した水の先端ではキャビテーションが発生
する。このキャビテーションつまり気泡の形成,壊滅の
連続的な発生現象によって、循環管路15の内壁には物
理的な衝撃がかかり、この内壁に付着した不純物(スケ
ール等)は剥離されるとともに、流れの反転による水の
抵抗の増加によっても不純物は除去され、循環管路15
内壁は良好に洗浄されることになる。また、上記したよ
うに、流れの切り換え時にはリークモードになって循環
管路15内の水は一旦静止した状態となり、かつ流れ方
向を切り換えた後の水は、その流れの先端で気泡の形
成,壊滅を繰り返しながら循環管路15内を移動するの
で、この循環管路15内に至る所で均一にキャビテーシ
ョンが発生することになり、循環管路15内壁は満遍な
く洗浄されることになる。
When the gas is injected into the water in this way, the molecular motion of the water is activated by the gas, and bubbles are likely to be generated even if the water at that time has a low temperature. When the water in this state is circulated at predetermined intervals in the forward flow mode and the reverse flow mode, the water flowed in the forward flow mode,
Next, a pressure difference occurs at the boundary with the water flowing in the reverse flow mode, and the molecular motion of water is activated by the injection of gas at the tip of the water flowing in the reverse flow mode. Cavitation occurs at the tip of the water. This cavitation, that is, a phenomenon of continuous formation and destruction of bubbles, gives a physical impact to the inner wall of the circulation conduit 15, and the impurities (scale etc.) attached to the inner wall are separated and the flow is reversed. Impurities are also removed by the increase in water resistance due to the circulation line 15
The inner wall will be well cleaned. Further, as described above, when the flow is switched, the leak mode is set so that the water in the circulation pipe 15 is temporarily stopped, and the water after switching the flow direction forms bubbles at the tip of the flow. Since the inside of the circulation pipe 15 is moved while being repeatedly destroyed, cavitation is uniformly generated everywhere in the circulation pipe 15, and the inner wall of the circulation pipe 15 is uniformly washed.

【0025】このように、正流モードと逆流モードによ
って水を流通させ、そのモードを切り換えた後の水の流
れの先端において発生した圧力差によって気泡の形成を
促進させる上、水に空気を注入することによって気泡の
形成がさらに促進されるので、この気泡の壊滅時に発生
する物理的な衝撃によって循環管路15内壁に付着した
不純物を剥離するとともに、流れの反転による水の抵抗
の増加によっても不純物を除去することができる。した
がって、単に水の流れ方向を切り換えるだけでは充分に
剥離しきれなかった不純物をも剥離することができ、循
環管路15内壁を良好に洗浄し、保全することができ
る。さらに、水使用機器2が、水によって冷却又は加熱
されるものである場合にも、水の入口と出口が反覆して
逆転されることによって循環管路15の温度が均一にな
り、したがって冷却又は加熱をも一様になすことができ
る。
As described above, the water is circulated in the forward flow mode and the reverse flow mode, the formation of bubbles is promoted by the pressure difference generated at the tip of the water flow after the mode is switched, and the air is injected into the water. By doing so, the formation of bubbles is further promoted, so that impurities attached to the inner wall of the circulation conduit 15 are separated by the physical impact generated when the bubbles are destroyed, and the resistance of water increases due to the reversal of the flow. Impurities can be removed. Therefore, impurities that could not be completely removed by simply switching the flow direction of water can be removed, and the inner wall of the circulation pipe line 15 can be washed well and maintained. Further, even when the water using device 2 is to be cooled or heated by water, the temperature of the circulation pipe line 15 becomes uniform by reversing the inlet and outlet of the water and thus cooling or heating. The heating can be uniform.

【0026】なお、本実施例において説明した入口側選
択弁Aと出口側選択弁Bとには、いかなる公知の切換弁
を適用してもその効果を得ることができるし、入口側選
択弁Aあるいは出口側選択弁Bを、それぞれ二つずつの
弁装置で構成しても勿論可能であるが、例えば三方ピス
トン弁(例えば、リックス株式会社販売『ロッキーバル
ブ』(商品名))を使用すると、以下のような利点があ
る。すなわち、このロッキーバルブは、蒸気,気体,
水,温水その他の流体に適用できるエアー式ON−OF
F弁であって、その構成を図6に示すように、ステム3
1の先端に特殊合成樹脂製ディスクリング32を設けて
良好なシール機能を確保し、シリンダ部33のシールパ
ッキン34が特殊な樹脂性パッキンから形成されている
ため潤滑油の供給を不要とするとともに耐熱性を向上さ
せ、グランド部35にはダストシール36及びリングワ
ッシャ37を配設して外部からの塵埃,流体からのスケ
ール等がステム31に付着するのを防ぎ、グランドパッ
キン38の寿命を向上させる等の特徴を有するものであ
る。このため、通常の弁では対応できない高温の液体
(約200℃程度)を流す場合にも適用でき、エアー圧
でステム31が進退して開閉を行うので、塵埃,スケー
ル等が噛み合って開閉動作に異常を来すことがなく、常
に良好な弁の切り換えを実現できる。また、このような
三方ピストン弁によれば、製造その他の経済性が向上す
る上、洗浄装置1全体がコンパクトに構成できるので、
例えば水使用機器2のそれぞれにオプションとして設置
することもできる。
Any known switching valve can be applied to the inlet side selection valve A and the outlet side selection valve B described in this embodiment, and the effect can be obtained, and the inlet side selection valve A can be obtained. Alternatively, it is of course possible to configure each of the outlet side selection valves B by two valve devices, but for example, when a three-way piston valve (for example, "Rocky valve" (trade name) sold by Rix Co., Ltd.) is used, There are the following advantages. That is, this rocky valve is
Air type ON-OF applicable to water, warm water and other fluids
As shown in FIG. 6, the stem 3 is an F valve.
A special synthetic resin disc ring 32 is provided at the tip of 1 to ensure a good sealing function, and since the seal packing 34 of the cylinder portion 33 is formed of a special resin packing, it is not necessary to supply lubricating oil. Heat resistance is improved, and a dust seal 36 and a ring washer 37 are provided in the gland portion 35 to prevent dust from the outside, scale from fluid, etc. from adhering to the stem 31, and improve the life of the gland packing 38. And so on. Therefore, it can be applied to the case of flowing a high temperature liquid (about 200 ° C.) that cannot be handled by a normal valve, and the stem 31 moves forward and backward by air pressure to open and close, so that dust, scale, etc. mesh with each other for opening and closing operation. It is possible to always achieve good valve switching without causing an abnormality. Further, according to such a three-way piston valve, the manufacturing efficiency and the like are improved, and the cleaning device 1 as a whole can be configured compactly.
For example, it may be installed as an option in each of the water using devices 2.

【0027】[0027]

【発明の効果】以上の説明から明らかなように、本発明
の管路の洗浄方法及びその装置によれば、以下の効果を
得ることができる。請求項1に記載のものによれば、液
体の流れ方向を正方向から逆方向に切り換えるととも
に、液体の流れが正方向のとき及び逆方向のときに、そ
れぞれこの液体に向けて気体を注入することで、流れの
反転による液体の抵抗の増加によって前記不純物は剥離
され、さらに逆方向に流れる液体の流頭部での気泡の壊
滅時に発生する衝撃によっても不純物が剥離されるの
で、流れ方向を切り換えるのみでは除去できなかった不
純物を好適に除去することができ、したがって管路内壁
を一層良好に洗浄することができる。
As is apparent from the above description, the following effects can be obtained by the method and apparatus for cleaning a pipeline according to the present invention. According to the first aspect of the present invention, the flow direction of the liquid is switched from the forward direction to the reverse direction, and the gas is injected into the liquid when the flow is in the forward direction and in the reverse direction, respectively. As a result, the impurities are separated by the increase in the resistance of the liquid due to the reversal of the flow, and the impurities are also separated by the impact generated when the bubbles are destroyed at the flow head of the liquid flowing in the opposite direction. Impurities that could not be removed only by switching can be suitably removed, and thus the inner wall of the conduit can be cleaned better.

【0028】請求項2に記載のものによれば、正流モー
ドと逆流モードとでは第一及び第二出入口での液体の出
入り方向が逆転して、液体使用機器での液体の流れ方向
が逆転し、液体使用機器でこれまでの液体の入口と出口
が逆になり、循環管路の段差や屈曲によって堆積したス
ケール等の不純物が逆方向の液体の流れによって除去さ
れるとともに、注入機構から注入した気体によって液体
内での気泡の形成が助長され、この気泡の壊滅時に発生
する衝撃によって循環管路内壁の不純物を剥離し、管路
の良好な洗浄を実現することができる。また、液体使用
機器を液体によって冷却又は加熱する場合にも、液体の
入口と出口が反覆して逆転されることによって循環管路
の温度が均一になり、したがって冷却又は加熱を一様に
なすことができる。
According to the second aspect of the present invention, in the forward flow mode and the reverse flow mode, the liquid inflow and outflow directions at the first and second inlets and outlets are reversed, and the liquid flow directions in the liquid using device are reversed. However, the liquid inlet and outlet have been reversed in equipment that uses liquid, and impurities such as scale accumulated due to steps and bends in the circulation pipeline are removed by the liquid flow in the opposite direction, and the liquid is injected from the injection mechanism. The formation of bubbles in the liquid is promoted by the generated gas, and the impurities generated on the inner wall of the circulation pipe can be peeled off by the impact generated when the bubbles are destroyed, so that good cleaning of the pipe can be realized. Also, when cooling or heating a liquid-using device with a liquid, the temperature of the circulation pipeline becomes uniform by reversing the inlet and outlet of the liquid so that the cooling or heating becomes uniform. You can

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明に係る洗浄装置の一実施例を示す回路図
である。
FIG. 1 is a circuit diagram showing an embodiment of a cleaning device according to the present invention.

【図2】正流モード時の水の流路を示す説明図である。FIG. 2 is an explanatory diagram showing a flow path of water in a normal flow mode.

【図3】逆流モード時の水の流路を示す説明図である。FIG. 3 is an explanatory diagram showing a flow path of water in a backflow mode.

【図4】リークモード時の水の流路を示す説明図であ
る。
FIG. 4 is an explanatory diagram showing a flow path of water in a leak mode.

【図5】本発明に係る注入機構を示す詳細分解図であ
る。
FIG. 5 is a detailed exploded view showing an injection mechanism according to the present invention.

【図6】本実施例において説明した三方ピストン弁の半
断面図である。
FIG. 6 is a half sectional view of the three-way piston valve described in this embodiment.

【符号の説明】[Explanation of symbols]

1 洗浄装置 2 液体使用機器 3 供給源 4 入口 5 出口 6 第一出入口 7 第二出入口 9 開閉切換機構 15 循環管路 22 注入機構 A 入口側選択弁 B 出口側選択弁 1 Cleaning Device 2 Liquid Using Equipment 3 Supply Source 4 Inlet 5 Outlet 6 First Inlet / Outlet 7 Second Inlet / Outlet 9 Open / Close Switching Mechanism 15 Circulation Pipeline 22 Injecting Mechanism A Inlet Side Selection Valve B Outlet Side Selection Valve

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 管路で液体の流れ方向を正方向及び逆方
向に切り換えるとともに、液体の流れが正方向のとき及
び逆方向のときに、それぞれこの液体に向けて気体を注
入して管路内に気泡を形成させ、その後の気泡の壊滅時
に発生する衝撃によって前記管路内壁に付着した不純物
を除去することを特徴とする管路の洗浄方法。
1. A pipeline for switching the flow direction of a liquid between a forward direction and a reverse direction, and a gas is injected into the pipeline when the flow of the liquid is a forward direction and a reverse direction, respectively. A method of cleaning a pipeline, characterized in that bubbles are formed in the interior of the pipeline, and the impurities adhering to the inner wall of the pipeline are removed by an impact generated when the bubbles are destroyed.
【請求項2】 弁本体に、液体の供給源に連続する入口
と、液体の排出先に連続する出口と、これら入口及び出
口に連通しかつ液体使用機器に連続する第一及び第二出
入口と、前記入口から入った液体の流れの向きを前記第
一出入口と第二出入口とこれらの両方とのいずれかに選
択する入口側選択弁と、前記出口に向かう液体の流れの
通過部として前記第一出入口と第二出入口とこれらの両
方とのいずれかを選択する出口側選択弁とを設けるとと
もに、前記入口側選択弁の第一出入口選択時に出口側選
択弁が第二出入口を選択する正流モードと、前記入口側
選択弁の第二出入口選択時に出口側選択弁が第一出入口
を選択する逆流モードとに切り換える開閉切換機構を設
け、さらに前記液体の供給源と前記入口側選択弁との間
の流路に気体を注入する注入機構を設けたことを特徴と
する洗浄装置。
2. The valve body has an inlet that is continuous with a liquid supply source, an outlet that is continuous with a liquid discharge destination, and first and second inlets and outlets that are connected to these inlets and outlets and that are continuous with a liquid-using device. An inlet-side selection valve that selects the direction of the flow of the liquid entering from the inlet to either the first inlet / outlet, the second inlet / outlet, or both of the first inlet / outlet, the second inlet / outlet, and the first passage as a passage for the liquid flow toward the outlet. A forward flow in which an outlet-side selection valve that selects either one of the inlet / outlet and the second inlet / outlet is provided, and the outlet-side selection valve selects the second inlet / outlet when the first inlet / outlet of the inlet-side selection valve is selected An opening / closing switching mechanism for switching between a mode and a reverse flow mode in which the outlet side selection valve selects the first inlet / outlet when selecting the second inlet / outlet of the inlet side selection valve, and further, the liquid supply source and the inlet side selection valve Inject gas into the flow path between A cleaning device provided with an injection mechanism for
JP22463793A 1993-09-09 1993-09-09 Pipe cleaning equipment Expired - Fee Related JP3340525B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22463793A JP3340525B2 (en) 1993-09-09 1993-09-09 Pipe cleaning equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22463793A JP3340525B2 (en) 1993-09-09 1993-09-09 Pipe cleaning equipment

Publications (2)

Publication Number Publication Date
JPH0780427A true JPH0780427A (en) 1995-03-28
JP3340525B2 JP3340525B2 (en) 2002-11-05

Family

ID=16816837

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22463793A Expired - Fee Related JP3340525B2 (en) 1993-09-09 1993-09-09 Pipe cleaning equipment

Country Status (1)

Country Link
JP (1) JP3340525B2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008297819A (en) * 2007-05-31 2008-12-11 Bridgestone Corp Pipe washing system and pipe washing method
JP2016175051A (en) * 2015-03-23 2016-10-06 佐藤商事株式会社 Pipe washing apparatus and pipe washing method
CN109907671A (en) * 2019-03-22 2019-06-21 广东水利电力职业技术学院(广东省水利电力技工学校) A kind of rice washer
JP2019135028A (en) * 2018-02-05 2019-08-15 リックス株式会社 Pipe cleaning device and pipe cleaning method
US11035629B2 (en) 2017-06-06 2021-06-15 Denso Corporation Heat exchange apparatus
CN117505357A (en) * 2023-11-29 2024-02-06 肇庆本田金属有限公司 Cleaning device for flushing salt core in piston

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008297819A (en) * 2007-05-31 2008-12-11 Bridgestone Corp Pipe washing system and pipe washing method
JP2016175051A (en) * 2015-03-23 2016-10-06 佐藤商事株式会社 Pipe washing apparatus and pipe washing method
US11035629B2 (en) 2017-06-06 2021-06-15 Denso Corporation Heat exchange apparatus
JP2019135028A (en) * 2018-02-05 2019-08-15 リックス株式会社 Pipe cleaning device and pipe cleaning method
CN109907671A (en) * 2019-03-22 2019-06-21 广东水利电力职业技术学院(广东省水利电力技工学校) A kind of rice washer
CN117505357A (en) * 2023-11-29 2024-02-06 肇庆本田金属有限公司 Cleaning device for flushing salt core in piston

Also Published As

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