JP2004204969A - Hydraulic oil cleaning-up device and method for hydraulic operating device - Google Patents

Hydraulic oil cleaning-up device and method for hydraulic operating device Download PDF

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Publication number
JP2004204969A
JP2004204969A JP2002375375A JP2002375375A JP2004204969A JP 2004204969 A JP2004204969 A JP 2004204969A JP 2002375375 A JP2002375375 A JP 2002375375A JP 2002375375 A JP2002375375 A JP 2002375375A JP 2004204969 A JP2004204969 A JP 2004204969A
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oil
hydraulic
hydraulic oil
operating device
hydraulic operating
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JP4050144B2 (en
Inventor
Fumio Nakajima
文雄 中嶋
Koichi Iwata
剛一 岩田
Masaharu Shimizu
正治 清水
Yoshitada Kobayashi
義賢 小林
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TMT & D KK
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TMT & D KK
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a hydraulic oil cleaning-up device for a hydraulic operating device capable of removing wastes in the hydraulic oil in a state of operating the equipment. <P>SOLUTION: A first suction device and a first foreign matter removing device connected with each other in series, are mounted in the outer part of a mechanism box of the hydraulic operating device, the hydraulic oil in the hydraulic operating device is introduced to the first suction device through an oil supply hose, and the hydraulic oil having passed through the first foreign matter removing device, is returned to the hydraulic operating device through a returning hose. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【0001】
【発明の属する技術分野】
本発明は、油圧操作機構を採用した電力用開閉器の作動油の保守管理に係り、特に、作動油の浄化の効率を向上させることを可能とした油圧操作装置の作動油浄化装置及び浄化方法に関するものである。
【0002】
【従来の技術】
一般に、電力用開閉器は静止電気機械に分類され、電路の切換や落雷や地絡等、事故の影響除去のために行う開閉時以外は、通電状態(閉路状態)あるいは開路状態を維持することが基本運用状態であるという機器の性格上、一般の常時動作している機械のような頻繁な保守点検は行われていない。
【0003】
このような電力用開閉器の内、油圧操作機構を採用する電力用開閉器としては電力用遮断器が多く、この電力用遮断器は機械的動作責務が最も過酷な機械といえる。この様な機械では、油圧操作機構の作動油として、夏の外気温40℃程度から、冬の厳冬期の屋外機器温度−20℃の間、動作時間が0.005秒程度の差に収まるよう配慮するため、油の粘度の影響を受けないように構造面の配慮をするだけでなく、作動油にも粘度指数が300を超えるような温度変化に対する粘度変化の少ない特殊な作動油を使うことが一般的である。
【0004】
この様な作動油は、冷凍倉庫用の機械や航空機に使用する作動油として市販されている。これらの作動油では、基油を溶剤に近いほど低粘度にすると共に、粘度安定剤をポリマー重量として10%程度添加するなど、通常の作動油の数倍の添加剤を使用して粘度安定性を確保している。また、酸化防止剤や極圧剤等によって、過酷な使用状態に対する耐性を確保している。
【0005】
一方、電力用開閉器では低温粘性を最重要基準としてこの様な作動油を採用するが、高温での使用が少ないこと、高速動作による発熱等を考えた場合、機器の実際の動作が年間高々数回と極めて少ないことから、酸化劣化や摩擦発熱等が少ないため、油の劣化は極めて少なく、通常6年間や12年間という長期間、作動油交換をしないことが一般的である。
【0006】
しかし、詳細に調査すると、長期間の屋外使用等によって、極圧剤の例えば燐酸トリクリシル等の燐酸エステル等が穏やかに金属と反応したり、分解したりしており、通常の過酷使用では発生しない反応中間生成物が発生することが判ってきた。このため、添加剤の析出等で、機器性能の内、特に微細隙間の閉塞やサクションストレーナ等の閉塞などが確認されている。
【0007】
これらの対策としては、より短期間での作動油交換等が考えられるが、機器運用効率の向上を考えると、定期的な運用停止による保守活動の回数を減らすことが強く望まれている。これまでの保守方法は、一定期間毎に機器を停止し、作動油の交換や機器動作の確認を実施してきた。例えば、小形の開閉器で1日、大形の開閉器で3日程度の機器補修を6年間に1回程度実施していた。しかし、機器運用の効率化の観点から、この補修期間を倍に延長することが望まれている。
【0008】
以下、図を参照して従来の遮断器点検時の作動油交換方法を説明する。なお、図6は遮断器の油管系統を示すものである。すなわち、機器運用中は、油槽34内の作動油を油圧ポンプ31によりストレーナ314を介して吸い込み、ラインフィルタ313を介して蓄圧器であるアキュムレータ4に送り込む。アキュムレータ4内は、作動油と反対側に可動ピストンを介して高圧窒素ガス等の不活性ガスが封入されており、作動油を圧入すると作動油の圧力と不活性ガス圧力がつり合うように可動ピストンが移動する。この様なアキュムレータは、一般にピストン型アキュムレータと呼ばれている。
【0009】
作動油をポンプで高圧側に圧送し続けると、油圧が徐々に上昇し、圧力スイッチ33が所定圧力を検出するとポンプの運転を停止する。その後は、圧油を使用した場合や自然の圧油漏れに伴ってアキュムレータ4内の圧油量が低下すると、油圧が低下するために、圧力スイッチ33が油圧低下を検出してポンプを再度運転する。
【0010】
そして、遮断器の接点を駆動する場合、電磁弁27または28を動作させて、駆動シリンダ内のピストン22の両側の油圧力を変更することで遮断器の接点を移動させると、この時の動作に必要な圧油がアキュムレータ4から供給され、使用後の圧油は排油路を通ってポンプのRポートに戻される。
【0011】
一方、点検の場合には、ポンプ電源を断って、止め弁39を開くことによって、人為的にアキュムレータ4内の圧油を油槽34内に戻す。この時、圧油の大半が油槽34に戻り、油槽内液面が最上限まで至る。この段階で作動油を油槽34から抜き取って作動油を交換する。
【0012】
【発明が解決しようとする課題】
上述したように、従来の作動油交換は、油圧を放圧して機器不動作の状態で実施しており、この場合、使用作動油中約90%程度の量の交換が可能であったが、この作業を実施するためには、機器を動作不能にするため、運転を停止して実施していた。
【0013】
このように、作動油交換を機器を停止した状態で行うこととした理由は、機器運用中はいつ系統事故が発生するか判らない状況下で可動部を含む機器機構箱内で作業をすることへの安全上の配慮、作動油を抜き去った場合に、機器動作に伴って作動油供給が必要になった場合に、補給用の油槽内の作動油がなくなっていると、作動油補給ができずに機器動作に支障をきたすこと等を考慮したためである。
【0014】
しかしながら、機器停止を極力なくして機器運用効率を高める昨今の要求から、機器定期点検周期を延長していくと、作動油交換の周期も同様に延長することになり、添加剤の劣化物等の相互作用で発生する老廃物が、ストレーナやより高圧部の微細隙間に影響を与える可能性が考えられるため、機器停止間隔の延長は困難であった。
【0015】
本発明は、上述したような従来技術の問題点を解決するために提案されたものであり、その第1の目的は、機器運用状態で作動油中の老廃物を除去することができる油圧操作装置の作動油浄化装置を提供することにある。
また、第2の目的は、機器運用状態のまま、作動油の異常状態を検出して、適切なタイミングで作動油の浄化を行うことができる油圧操作装置の作動油浄化方法を提供することにある。
【0016】
【課題を解決するための手段】
上記の目的を達成するため、請求項1に記載の油圧操作装置の作動油浄化装置は、油圧操作装置の機構箱の外部に、互いに直列に接続した第1の吸い込み装置と第1の異物除去装置を設置し、前記油圧操作装置内の作動油を、給油ホースを介して前記第1の吸い込み装置に導入し、前記第1の異物除去装置を経由した作動油を、戻りホースを介して、前記油圧操作装置に戻すように構成したことを特徴とするものである。
上記のような構成を有する請求項1の発明によれば、機器を停止することなく、必要な時に作動油の延命処置を講ずることが可能となり、機器運用効率を向上させることができる。
【0017】
請求項2に記載の発明は、請求項1に記載の油圧操作装置の作動油浄化装置において、前記第1の吸い込み装置及び第1の異物除去装置と並列に、第2の吸い込み装置を配設し、前記第1の吸い込み装置と前記第2の吸い込み装置を、同時に又は交互に運転するように構成したことを特徴とするものである。
上記のような構成を有する請求項2の発明によれば、第2の吸い込み装置によって、油槽内に沈殿固着している老廃物を撹拌して、第1の吸い込み装置に導入しやすくすることができる。その結果、浄化効果を高め、作業時間を短縮することが可能となる。
【0018】
請求項3に記載の発明は、請求項2に記載の油圧操作装置の作動油浄化装置において、前記第2の吸い込み装置に、第2の異物除去装置を直列に接続したことを特徴とするものである。
上記のような構成を有する請求項3の発明によれば、第2の吸い込み装置に直列に接続した第2の異物除去装置によって、主として大粒径の粒子や比重の高い粒子を捕捉すると同時に、第1の異物除去装置によって、微細粒径の異物除去を行うことによって、高効率の浄化作業が可能となる。
【0019】
請求項4に記載の発明は、請求項1乃至請求項3のいずれか一に記載の油圧操作装置の作動油浄化装置において、前記油圧操作装置の機構箱に、前記給油ホース及び戻りホースを挿入することができる開口部を設け、この開口部を前記両ホースを取り付けた状態で閉止できるように構成したことを特徴とするものである。
上記のような構成を有する請求項4の発明によれば、機器運用中の作業において、精密な操作機構を収納した機構箱内と外部装置を接続した場合でも、風雨等から内部を守ることができる。
【0020】
請求項5に記載の油圧操作装置の作動油浄化方法は、油圧操作装置の油槽に設けられた油面計に、その背面または側面から光を照射して油面計内の作動油を観察し、作動油の不均一性を確認した場合に、作動油の浄化作業が必要であると判断することを特徴とするものである。
上記のような構成を有する請求項5の発明によれば、精密機器分析をせずに、光源と目視比較サンプルを使用して、簡易な方法で作動油の変質を見分けることができるので、浄化作業の必要な時期の判断が容易となる。
【0021】
請求項6に記載の油圧操作装置の作動油浄化方法は、油圧操作装置の油槽の底部から作動油を採取し、目開き50μm乃至150μmの濾過部材を透過させ、この時の透過時間が所定時間を超えた場合、あるいは網目上に異物を確認した場合に、作動油の浄化作業が必要であると判断することを特徴とするものである。上記のような構成を有する請求項6の発明によれば、微細孔やフィルター閉塞作用のある析出物の量を、メッシュ状の濾過部材を使用して簡易に判定することができるので、浄化作業の必要な時期の判断が容易となる。
【0022】
請求項7に記載の油圧操作装置の作動油浄化方法は、油圧操作装置のポンプの自動運転回路にポンプ運転時間計とポンプ運転回数計を設け、所定期間のポンプ運転時間が、使用初期のポンプ運転時間の所定倍数を超えた場合に、作動油の浄化作業が必要であると判断することを特徴とするものである。
上記のような構成を有する請求項7の発明によれば、機器内のポンプの性能低下を、浄化作業が必要か否かの判断要素とすることにより、浄化作業の必要な時期の判断が容易となる。
【0023】
請求項8に記載の油圧操作装置の作動油浄化方法は、油圧操作装置の油槽の開口部からファイバースコープを挿入し、常時、油面付近の油槽壁面や油槽内構造物側面を観察し、析出物の付着を認めた場合に、作動油の浄化作業が必要であると判断することを特徴とするものである。
上記のような構成を有する請求項8の発明によれば、異物の付着特性を生かして、ファイバースコープを利用し、異物の発生を実際に目視確認することができるので、浄化作業の必要な時期の判断が容易となる。
【0024】
【発明の実施の形態】
以下、本発明に係る油圧操作装置の作動油浄化装置及び浄化方法の実施の形態について、図面を参照して説明する。なお、図6に示した従来型と同一の部材には同一の符号を付して、説明は省略する。
【0025】
(1)第1実施形態
図1は、本発明の第1実施形態の構成を示すものであって、要部の油槽を含むポンプユニット部分を示したものである。
本実施形態においては、開閉器の外部に、個別のポンプを含む第1の吸い込み装置250と、この第1の吸い込み装置250から作動油を供給され、内部に設けられた異物除去部で作動油中の異物を除去する第1の異物除去装置450とが配設されている。
【0026】
また、前記第1の吸い込み装置250は、給油ホース200によって、開閉器の低圧油槽開口部(図中では、注油口兼呼吸器316部分)を介して油槽34と連通されている。また、前記第1の異物除去装置450と油槽34とは、戻りホース300によって連通され、第1の異物除去装置450内の作動油が所定量以上になると、開閉器の油槽34に作動油を戻すように構成されている。
【0027】
なお、給油ホース200及び戻りホース300と、第1の吸い込み装置250、第1の異物除去装置450内に初期空間があると、これらの装置を運用した直後、その空間分だけ開閉器内油槽34の油量が減少するため、この減少を最小限にするための調整用作動油を運用前に予備作動油容器500から第1の異物除去装置450内に取り込んでおくことが望ましい。
【0028】
このように構成された本実施形態においては、まず、戻りホース300を開閉器油槽34に取付け、給油ホース200を予備作動油容器500に取付けて第1の吸い込み装置250を駆動し、戻りホース300内が作動油で充満するようにした後、給油ホース200を開閉器油槽34内に装着する。この段階から第1の吸い込み装置250を運転すると、開閉器油槽34内の作動油は、給油ホース200→第1の吸い込み装置250→第1の異物除去装置450→戻りホース300を介して循環するため、開閉器内の作動油量は一定値を保って、外部に設けられた第1の異物除去装置450との間を循環することができる。
【0029】
なお、第1の異物除去装置450として、濾過装置や静電浄油装置、脱水装置等、作動油の浄化に最適な装置を用いることにより、油槽内の作動油を効率よく浄化することができる。また、通常、濾過装置や浄化装置は密閉式なので、第1の吸い込み装置250の流量を系全体で一定に保ち、初期に油量調整することによって、開閉器側の油量を変化させずに、作動油を循環浄化することができる。
【0030】
このように、本実施形態によれば、機器運用中の浄化作業が可能となり、長時間の機器停止ができない状況でも、作動油の健全性を確保することができる。
【0031】
(2)第2実施形態
次に、本発明に係る作動油の浄化装置の第2実施形態を図2を用いて説明する。本実施形態は上記第1実施形態の変形例であって、第1実施形態の構成に第2の吸い込み装置251、第2の給油ホース201及び第2の戻りホース301を追加したものである。
【0032】
通常、浄油作業を実施すると、老廃物や沈降異物、油槽壁面に付着した異物等の存在が見出されることが多い。この沈降異物は比重の重い金属反応物が多く、その上に有機物が沈降している。また、壁面や油面付近には粘着性有機物が多く存在する。
【0033】
これらの異物を除去するために、濾過精度を高めようとすると、透過粒径に小さな濾過材を使用するか、静電吸着等を使用することが多い。しかし、これらの装置を使用した場合、浄化装置部分の流速を高めると浄化性能が低下する傾向にあるため、開閉器油槽内の作動油を撹拌する能力が制限されてしまう。
【0034】
本実施形態は、この様な問題点を解決することを目的とするものであり、濾過機能を具備しない撹拌用装置として機能する第2の吸い込み装置251を、第1の吸い込み装置250及び第1の異物除去装置450と並列に取付けたものである。
【0035】
このような構成を有する本実施形態においては、油槽34から給油ホース200に導入した作動油の一部を、第2の給油ホース201を介して、撹拌用の第2の吸い込み装置251に導き、第2の戻りホース301を介して、そのまま油槽34に戻す。一方、油槽34から給油ホース200に導入した作動油の残りは、第1実施形態と同様に、第1の吸い込み装置250及び第1の異物除去装置450に導入され、異物除去がなされる。
【0036】
このようにすると、開閉器油槽34内は強度に撹拌され、底部沈降物や壁面付着物が作動油に分散され、第1の異物除去装置450に導かれるため、老廃物除去の効率をより高めることができる。
【0037】
なお、この様な撹拌装置としては、スクリュー式の撹拌装置等も市販されているが、機器運用中にこの様な装置を装着することは、機構箱内に持ち込む装置が増加するため好ましくない。また、作動油の撹拌滞電や加熱等を考えると、余り強固に長時間撹拌しない方が良い場合もある。本発明者等の試験結果では、油槽内作動油を3分間で全量交換できる程度の流量で10分間程度撹拌継続すると、ほぼ油中粒子数は上限値になった。
【0038】
したがって、浄化処置前にこの様な撹拌を実施してから作業をするか、あるいは交互に撹拌と浄化を実施することで沈降性異物・付着性異物をより効率的に除去することができる。なお、図2では、開閉器油槽内には吸排2本のホースしか装着していないが、作業条件が許せば、撹拌用の吸排のホースを独立に装着することも可能である。
【0039】
(3)第3実施形態
次に、本発明に係る作動油の浄化装置の第3実施形態を図2を用いて説明する。なお、本実施形態は上記第2実施形態の変形例であって、第2の吸い込み装置251に、例えば、透過粒径50ミクロン以上の粗い透過装置や、サイクロンのような遠心除去装置、あるいは磁力を使用した吸着装置等の第2の異物除去装置(図示せず)を直列に接続したものである。
【0040】
このような構成を有する本実施形態によれば、第2の吸い込み装置251に直列に接続した第2の異物除去装置によって、大粒径の異物や極めて比重の高い異物を除去することができる。特に、磁力を使用した吸着装置は、磁性金属異物を吸着するが、金属異物は比重が重いため、低速流の装置では装置に到達する前にホース内で壁面に付着して捕捉できないが、高速流の装置では捕捉装置まで流れに乗せて持ち込むことが可能である。
【0041】
このようにすると、大粒径の異物や金属分等を予め除去できると同時に、循環している異物の粒径を均質化できるため、例えば静電式除去装置等では、極板間の不慮の短絡等を防止する効果もあり、効率向上に有効である。
【0042】
(4)第4実施形態
上記の実施形態においては、作動油中の異物除去について述べてきたが、次にこの様な油中異物除去を実施する場合に、運用中の機器の機構箱を開放状態で作業することとなり、循環浄化作業に要する数時間の間、天候変化等から機器をも守るために処置をする必要がある。本実施形態は、このための対応策を提案するものである。
【0043】
すなわち、本実施形態においては、図3に示すように、扉部材600に開口部604が形成され、この開口部604に、中央に穴部605を有する貫通板603が着脱可能に取り付けられている。この貫通板603は、ゴムパッキン601及びくさび602を介して、前記開口部604を閉塞できるように取り付けられている。そして、浄化作業の実施中には、この貫通板603の穴部605に上記2つの吸排ホースを挿入し、作業が終了した後は、穴部を有しない閉塞板(図示せず)を取り付けるように構成されている。
【0044】
なお、この貫通板としては、開閉器の内部観察用に機構箱扉に設けられた透明な窓を利用することもできる。この窓は、一般にプラスチック板か強化ガラス板をゴムパッキンで鉄板の扉に装着して構成されている。
【0045】
このような構成を有する本実施形態によれば、機器使用中に長時間作動油処理を実施していても扉を開放しておく必要がなく、機器の内部に悪影響を与えることなく作業ができる。
【0046】
(5)第5実施形態
本実施形態は、上記の実施形態で述べた油中異物除去を実施するタイミングを適切に判断する方法を提供するものである。なお、図4は開閉器機構箱の内部配置例を示す側面図、図5は正面図である。
【0047】
一般に、油槽34には油面を確認するために透明な油面計36が設けられている。この油面計36には、その上下で油槽内部と連通する竪穴が形成されており、油面計36内に作動油が導かれている。そのため、油槽34内の作動油のごく一部がこの部分から直接目視確認することができる。
【0048】
本発明者等はこの点に着目し、油面計36の背後または見る位置の横方向から均質な光を照射することができる光源(図示せず)を配設したものである。なお、この光源としては、光量が均一で安定していることが必要であり、キセノンランプやハロゲンランプ、または蛍光燈が望ましい。
【0049】
そして、このような光源を油面計36の側面または背面から照射して、油面計36内の作動油を観察する。一般に、変質した作動油は透明度が低下することが多く、また、変質分は作動油と微かに比重が異なるか、または極性を帯びて異物同士集合する傾向があるため、この観察結果を、同様の照射条件で劣化作動油モデルを撮影した写真と比較することにより、透過光の差や透明度の差を判断することができる。
【0050】
このようにして油中劣化物を確認した場合、所定の期間以内に上記第1実施形態〜第3実施形態の浄化作業を実施するようにすると、定期的に作業する場合に比べて作業量を低減でき、より効率的な保守が可能となる。
【0051】
(6)第6実施形態
本実施形態も、上記の実施形態で述べた油中異物除去を実施するタイミングを適切に判断する方法を提供するものである。
すなわち、作動油劣化物で最も直接的に開閉器の性能に影響するのは、ストレーナの閉塞をもたらすような異物である。この異物発生の確認を簡易的にする方法として、油槽底部から適量の作動油を採取し、目開き50μm乃至150μmの金網を通過させる。
【0052】
本発明者等の試験では、100ml当り通常は何回繰り返しても数秒で通過するが、異物が発生している作動油では、10秒を超える通過時間を観察し、作業を繰り返すことで通過できなくなることを確認した。程度は対象とするストレーナの網目目開きで変るが、採取通過を3回程度繰り返し、通過時間が明らかに延長する場合、影響が発生すると判断できる。
【0053】
この様な確認によって異物を発見した場合、明らかに網目に異物の付着も確認できる。この様な簡易判断の結果、異物が確認された場合に、上記第1実施形態〜第3実施形態の浄化作業を実施するようにすると、定期的に作業する場合に比べて作業量を低減でき、より効率的な保守が可能となる。
【0054】
(7)第7実施形態
本実施形態も、上記の実施形態で述べた油中異物除去を実施するタイミングを適切に判断する方法を提供するものである。
一般に、油中析出物は油中にある程度分散するため、急激にストレーナを目詰まりさせるものではないが、徐々に閉塞させる。油圧回路でストレーナは大気圧とポンプ吸い込みによる負圧の差圧力だけで透過させているため、最も閉塞しやすい部分である、高圧開路中に設けた細孔やフィルタでは、閉塞した場合、閉塞点前後の差圧が高くなるが、ストレーナでは高々1気圧の差圧力しか発生しないためである。このストレーナの閉塞はポンプの吐出量に直接影響する。
【0055】
開閉器では機器は静止待機しているが、高低圧間の油漏れは必ず存在し、このためにポンプ圧油が減少してポンプは適度に自動運転して所定油圧を保つように設定されている。この補充用の自動運転は圧力スイッチで実施しているため、ポンプ性能が一定であれば補充用運転時間もほぼ一定である。そこで、ポンプ運転回路に積算時間計と運転回数計を設けることで、所定回数ポンプが運転した場合のポンプ運転積算時間を得ることができる。
【0056】
この様な記録をすることで、ポンプの運転時間が延長した場合、ポンプ性能の低下としてストレーナの閉塞を感知できる。ポンプ補充運転時間が一定値を超えた場合に、上記第1実施形態〜第3実施形態の浄化作業を実施するようにすると、その後の閉塞要素を除去することができる。なお、遮断器等の開閉器では20%乃至50%以上時間が延びた場合に処置をすることが望ましいが、この値は機器の運用状況や裕度の設定によって適宜値を選定することができる。
【0057】
(8)第8実施形態
本実施形態も、上記の実施形態で述べた油中異物除去を実施するタイミングを適切に判断する方法を提供するものである。
本実施形態は、粘着性異物が油面付近の金属壁面に付着し易い性質を利用したものである。すなわち、添加剤、特に極圧剤系統の劣化物は金属壁面に付着し易く、これらを核にした異物は壁面付着性がある。但し、大量の油中では壁面よりも劣化物相互に引き合って集合を作るため明確な壁面付着は見え難い。
【0058】
一方、油面付近では、前述のポンプの補充運転の影響で、静止機器といえども常時油面は一定範囲で変動しており、この部分では壁面に付着した劣化物が作動油を除かれ濃縮する。このため油中よりも壁面付着性が現れやすい。
【0059】
さらに、気液界面であるために酸化や加水反応も起こり易く、様々な異物が液面付近の壁面に付着する。この壁面をファイバースコープ等を挿入して確認すると、劣化物の多寡が明確に判断できる。高性能ファイバースコープでは油中のストレーナを直接観察できるが、高性能ファイバースコープは高価であり、また作動油と色相の類似した析出物の判断は難しい。
【0060】
しかし、液面の若干上の気中部分を観察するのには通常のファイバースコープで可能であり、色相も液面上に液面と類似のものが見えることから判断が容易である。絶対量評価は困難であるが、上記の浄化処置を実施する時期の目途を得るためにはこれで充分である。
【0061】
(9)他の実施形態
本発明は、上述した実施形態に限定されるものではなく、第1及び第2の異物除去装置としては、除去対象となる異物に応じて適切な装置に交換することもできる。また、第5〜第8実施形態に示した油中異物除去を実施するタイミングの判断方法は、単一で用いるだけでなく、複合して用いることにより、より多面的な判断ができることは言うまでもない。
【0062】
【発明の効果】
以上説明したように、本発明によれば、機器運用状態で作動油中の老廃物を除去することができる油圧操作装置の作動油浄化装置を提供することができる。また、機器運用状態のまま、作動油の異常状態を検出して、適切なタイミングで作動油の浄化を行うことができる油圧操作装置の作動油浄化方法を提供することができる。
【0063】
その結果、これまで機器の停止点検に合わせて実施してきた作動油の交換等の作業を、機器運用中にあるいはごく短時間の機器停止の機会に実施することができるため、機器の定期停止点検期間の延長が可能になり、開閉器の運用効率を高めることが可能になる。
【図面の簡単な説明】
【図1】本発明に係る油圧操作装置の作動油浄化装置の第1実施形態の構成を示す概略図。
【図2】本発明に係る油圧操作装置の作動油浄化装置の第2・第3実施形態の構成を示す概略図。
【図3】本発明に係る油圧操作装置の作動油浄化装置の第4実施形態の構成を示す概略図。
【図4】電力用開閉器機構箱の内部配置例を示す側面図。
【図5】電力用開閉器機構箱の内部配置例を示す正面図。
【図6】一般的な開閉器の油圧操作機構の構成を示す油管系統図。
【符号の説明】
1…遮断部
11…遮断部内の開閉器接点
2…操作シリンダ(アクチュエータ)
21…シリンダ
22…ピストン
27、28…電磁弁
211…ピストンロッド
3…ポンプ関連部分
31…油圧ポンプ
32…電動機
33…圧力スイッチ
34…油槽
35…油面計
36…圧力計
37…高圧配管
38、39…止め弁
310…逆止弁
311…逃し弁
312…継手
313…ラインフィルタ
314…ストレーナ
315…油面スイッチあるいはフロートスイッチ
316…注油口兼呼吸器
320…低圧配管
4…アキュムレータ(蓄圧器)
9…機構箱
100…油面
200…給油ホース
300…戻りホース
250…吸い込み装置
251…第2の吸い込み装置
450…異物除去装置
500…予備作動油容器
600…扉部材
601…ゴムパッキン
602…くさび
603…貫通板
604…開口部
605…穴部
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to maintenance management of hydraulic oil for a power switch employing a hydraulic operating mechanism, and in particular, to a hydraulic oil purifying apparatus and a cleaning method for a hydraulic operating device capable of improving the efficiency of purifying hydraulic oil. It is about.
[0002]
[Prior art]
In general, power switches are classified as static electric machines, and they must be kept energized (closed) or open except when switching is performed to eliminate the effects of accidents such as switching of electrical circuits or lightning or ground faults. Due to the nature of the device, which is in a basic operation state, frequent maintenance and inspections are not performed as in general constantly operating machines.
[0003]
Among such power switches, there are many power circuit breakers that employ a hydraulic operating mechanism, and this power circuit breaker can be said to be the machine with the most severe mechanical operation duty. In such a machine, as a hydraulic oil for the hydraulic operating mechanism, the operation time falls within a range of about 0.005 seconds between an outside air temperature of about 40 ° C. in summer and an outdoor equipment temperature of −20 ° C. in severe winter in winter. In order to take into consideration, not only consider the structural aspect so that it is not affected by the viscosity of the oil, but also use a special hydraulic oil with a small viscosity change with temperature change such that the viscosity index exceeds 300 as the hydraulic oil. Is common.
[0004]
Such hydraulic oils are commercially available as hydraulic oils for use in machines and aircraft for freezer warehouses. In these hydraulic oils, the viscosity is reduced by using an additive several times that of ordinary hydraulic oil, such as making the viscosity lower as the base oil is closer to the solvent and adding a viscosity stabilizer to the polymer by about 10% by weight. Is secured. In addition, an antioxidant, an extreme pressure agent, and the like ensure resistance to severe use conditions.
[0005]
On the other hand, power switches use such hydraulic oil with low temperature viscosity as the most important criterion.However, considering that there is little use at high temperature and heat generation due to high speed operation, the actual operation of equipment will increase Since it is extremely small, such as several times, there is little oxidative deterioration or frictional heat generation, so the oil deterioration is extremely small, and it is common that hydraulic oil is not replaced for a long period of time, usually 6 years or 12 years.
[0006]
However, a detailed investigation shows that extreme pressure agents such as phosphoric acid esters such as tricrisyl phosphate are gently reacted with metal or decomposed due to long-term outdoor use or the like, and do not occur in normal severe use. It has been found that reaction intermediates are generated. For this reason, it has been confirmed that, due to the precipitation of the additive, etc., in particular, blockage of the minute gap and blockage of the suction strainer and the like among the device performance.
[0007]
As a countermeasure for this, it is conceivable to change hydraulic oil in a shorter period of time. However, in consideration of improvement in equipment operation efficiency, it is strongly desired to reduce the number of maintenance activities due to periodic stoppage of operation. Conventional maintenance methods have stopped the equipment at regular intervals, replaced hydraulic oil, and confirmed the operation of the equipment. For example, equipment repair was performed once a day for a small switch and about three days for a large switch once every six years. However, it is desired to double this repair period from the viewpoint of improving the efficiency of equipment operation.
[0008]
Hereinafter, a conventional hydraulic oil replacement method at the time of a circuit breaker inspection will be described with reference to the drawings. FIG. 6 shows an oil pipe system of the circuit breaker. That is, during the operation of the device, the hydraulic oil in the oil tank 34 is sucked by the hydraulic pump 31 via the strainer 314 and sent to the accumulator 4 as a pressure accumulator via the line filter 313. The accumulator 4 is filled with an inert gas such as high-pressure nitrogen gas via a movable piston on the side opposite to the hydraulic oil. When the hydraulic oil is pressed into the movable piston, the movable piston and the inert gas pressure are balanced. Moves. Such an accumulator is generally called a piston type accumulator.
[0009]
When the hydraulic oil is continuously pumped to the high pressure side by the pump, the oil pressure gradually increases, and when the pressure switch 33 detects a predetermined pressure, the operation of the pump is stopped. Thereafter, when the pressure oil is used or when the amount of the pressure oil in the accumulator 4 is reduced due to a natural leak of the pressure oil, the oil pressure is reduced. Therefore, the pressure switch 33 detects the decrease in the oil pressure and operates the pump again. I do.
[0010]
When the contacts of the circuit breaker are driven by operating the solenoid valves 27 or 28 to change the oil pressure on both sides of the piston 22 in the drive cylinder, the operation at this time is performed. Is supplied from the accumulator 4, and the used pressure oil is returned to the R port of the pump through the drainage passage.
[0011]
On the other hand, in the case of inspection, the pressure oil in the accumulator 4 is artificially returned to the oil tank 34 by turning off the pump power and opening the stop valve 39. At this time, most of the pressure oil returns to the oil tank 34, and the liquid level in the oil tank reaches the upper limit. At this stage, the operating oil is extracted from the oil tank 34 and the operating oil is replaced.
[0012]
[Problems to be solved by the invention]
As described above, the conventional hydraulic oil replacement is performed in a state where the device is not operated by releasing the hydraulic pressure. In this case, about 90% of the used hydraulic oil can be replaced. In order to perform this work, the operation was stopped and the operation was performed in order to render the equipment inoperable.
[0013]
In this way, the reason for changing the hydraulic oil while the equipment is stopped is that work must be performed in the equipment mechanism box including the movable parts in a situation where it is not known when a system accident will occur during the operation of the equipment. Considering safety considerations, if the hydraulic oil is drained out, if the supply of hydraulic oil is required due to the operation of the equipment, and if the oil in the replenishing oil tank is This is because consideration has been given to, for example, not being able to do so and hindering device operation.
[0014]
However, due to recent demands to improve equipment operation efficiency by minimizing equipment shutdowns, if the equipment periodic inspection cycle is extended, the hydraulic oil replacement cycle will be extended as well, resulting in deterioration of additives and other substances. It is difficult to extend the equipment stop interval because waste products generated by the interaction may affect the strainer and the fine gap in the higher pressure part.
[0015]
SUMMARY OF THE INVENTION The present invention has been proposed to solve the problems of the prior art as described above, and a first object of the present invention is to provide a hydraulic operation capable of removing wastes in hydraulic oil in an operation state of equipment. An object of the present invention is to provide a hydraulic oil purifying device for a device.
A second object is to provide a method of purifying a hydraulic oil of a hydraulic operating device capable of detecting an abnormal state of the hydraulic oil in an operation state of the device and purifying the hydraulic oil at an appropriate timing. is there.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, a hydraulic oil purifying device for a hydraulic operating device according to claim 1 comprises a first suction device and a first foreign matter removal connected in series with each other outside a mechanism box of the hydraulic operating device. A device is installed, the hydraulic oil in the hydraulic operating device is introduced into the first suction device via an oil supply hose, and the hydraulic oil via the first foreign matter removing device is returned via a return hose. It is configured to return to the hydraulic operating device.
According to the first aspect of the present invention having the above-described configuration, it is possible to take measures to extend the life of the hydraulic oil when necessary without stopping the device, thereby improving the operation efficiency of the device.
[0017]
According to a second aspect of the present invention, in the hydraulic oil purifying device for a hydraulic operating device according to the first aspect, a second suction device is provided in parallel with the first suction device and the first foreign matter removing device. The first suction device and the second suction device are configured to operate simultaneously or alternately.
According to the second aspect of the present invention having the above-described configuration, the second suction device stirs the wastes settled and fixed in the oil tank to facilitate introduction into the first suction device. it can. As a result, it becomes possible to enhance the purification effect and shorten the operation time.
[0018]
According to a third aspect of the present invention, in the hydraulic oil purifier of the hydraulic operating device according to the second aspect, a second foreign matter removing device is connected in series to the second suction device. It is.
According to the invention of claim 3 having the above-described configuration, the second foreign matter removing device connected in series to the second suction device mainly captures particles having a large particle diameter or particles having a high specific gravity, The first foreign matter removing device removes foreign matter having a fine particle diameter, thereby enabling a highly efficient cleaning operation.
[0019]
According to a fourth aspect of the present invention, in the hydraulic oil purifying device for a hydraulic operating device according to any one of the first to third aspects, the oil supply hose and the return hose are inserted into a mechanism box of the hydraulic operating device. And an opening that can be closed with the two hoses attached.
According to the invention of claim 4 having the above configuration, in the operation during operation of the equipment, even when the inside of the mechanism box containing the precise operation mechanism and the external device are connected, the inside can be protected from the weather and the like. it can.
[0020]
According to a fifth aspect of the present invention, there is provided a method for purifying hydraulic oil in a hydraulic operating device, wherein the oil level gauge provided in an oil tank of the hydraulic operating device is irradiated with light from the back or side thereof to observe the hydraulic oil in the oil level gauge. When the non-uniformity of the hydraulic oil is confirmed, it is determined that the operation of purifying the hydraulic oil is necessary.
According to the fifth aspect of the present invention having the above-described configuration, it is possible to use a light source and a visual comparison sample to identify deterioration of the working oil by a simple method without performing precision instrument analysis. It is easy to determine when work is required.
[0021]
In the method for purifying hydraulic oil of a hydraulic operating device according to claim 6, the hydraulic oil is collected from the bottom of the oil tank of the hydraulic operating device and passed through a filter member having an aperture of 50 μm to 150 μm. Is exceeded, or when a foreign substance is confirmed on the mesh, it is determined that the cleaning operation of the working oil is necessary. According to the sixth aspect of the present invention having the above-described configuration, the amount of the fine pores and the amount of the precipitate having the filter blocking effect can be easily determined by using the mesh-shaped filtering member. This makes it easy to determine when necessary.
[0022]
According to a seventh aspect of the present invention, there is provided a method for purifying hydraulic oil of a hydraulic operating device, wherein a pump operating time counter and a pump operating frequency counter are provided in an automatic operation circuit of a pump of the hydraulic operating device, and a pump operating time for a predetermined period is set to an initial operating time. When a predetermined multiple of the operation time is exceeded, it is determined that a cleaning operation of the hydraulic oil is necessary.
According to the seventh aspect of the present invention having the above-described configuration, the deterioration of the performance of the pump in the apparatus is used as a determination factor of whether or not the cleaning operation is necessary, so that it is easy to determine when the cleaning operation is necessary. It becomes.
[0023]
In the method for purifying hydraulic oil of a hydraulic operating device according to claim 8, a fiberscope is inserted from an opening of an oil tank of the hydraulic operating device, and an oil tank wall surface near an oil surface and a side surface of a structure in the oil tank are constantly observed to be deposited. When the adherence of an object is recognized, it is determined that a cleaning operation of the hydraulic oil is necessary.
According to the eighth aspect of the present invention having the above-described configuration, it is possible to actually visually check the generation of the foreign matter by utilizing the adhesion property of the foreign matter and utilizing the fiberscope. Is easy to determine.
[0024]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a hydraulic oil purifying device and a purifying method for a hydraulic operating device according to the present invention will be described with reference to the drawings. The same members as those of the conventional type shown in FIG. 6 are denoted by the same reference numerals, and description thereof will be omitted.
[0025]
(1) First embodiment
FIG. 1 shows a configuration of a first embodiment of the present invention, and shows a pump unit portion including a main part of an oil tank.
In the present embodiment, a first suction device 250 including an individual pump is supplied to the outside of the switch, and a hydraulic oil is supplied from the first suction device 250, and the hydraulic oil is supplied to a foreign matter removing unit provided therein. A first foreign matter removing device 450 for removing foreign matter therein is provided.
[0026]
Further, the first suction device 250 is connected to the oil tank 34 via a low-pressure oil tank opening of the switch (in the figure, an oil inlet / respirator 316) by an oil supply hose 200. Further, the first foreign matter removing device 450 and the oil tank 34 are communicated with each other by a return hose 300, and when the hydraulic oil in the first foreign matter removing device 450 becomes equal to or more than a predetermined amount, the hydraulic oil is filled into the oil tank 34 of the switch. It is configured to return.
[0027]
If there is an initial space in the refueling hose 200 and the return hose 300, the first suction device 250, and the first foreign matter removing device 450, immediately after the operation of these devices, the oil tank 34 in the switch for the space. Therefore, it is desirable that the adjusting hydraulic oil for minimizing this decrease be taken from the preliminary hydraulic oil container 500 into the first foreign matter removing device 450 before operation.
[0028]
In this embodiment configured as described above, first, the return hose 300 is attached to the switch oil tank 34, the oil supply hose 200 is attached to the preliminary hydraulic oil container 500, and the first suction device 250 is driven. After the inside is filled with the working oil, the oil supply hose 200 is mounted in the switch oil tank 34. When the first suction device 250 is operated from this stage, the operating oil in the switch oil tank 34 circulates through the oil supply hose 200 → the first suction device 250 → the first foreign matter removing device 450 → the return hose 300. Therefore, the amount of hydraulic oil in the switch can be maintained at a constant value and circulated between the switch and the first foreign matter removing device 450 provided outside.
[0029]
By using a device that is optimal for purifying hydraulic oil, such as a filtration device, an electrostatic oil purifier, or a dehydrator, as the first foreign matter removing device 450, it is possible to efficiently purify the hydraulic oil in the oil tank. . Also, since the filtering device and the purifying device are usually of a closed type, the flow rate of the first suction device 250 is kept constant throughout the system, and the oil amount is adjusted at the initial stage so that the oil amount on the switch side is not changed. The working oil can be circulated and purified.
[0030]
As described above, according to the present embodiment, the cleaning operation can be performed during the operation of the device, and the soundness of the hydraulic oil can be ensured even when the device cannot be stopped for a long time.
[0031]
(2) Second embodiment
Next, a second embodiment of the apparatus for purifying hydraulic oil according to the present invention will be described with reference to FIG. This embodiment is a modification of the first embodiment, in which a second suction device 251, a second oil supply hose 201, and a second return hose 301 are added to the configuration of the first embodiment.
[0032]
Usually, when the oil purification operation is performed, the presence of wastes, settled foreign substances, foreign substances attached to the oil tank wall, and the like is often found. Many of these precipitated foreign substances have a heavy metal reactant, on which organic substances are deposited. In addition, there are many sticky organic substances near the wall surface and the oil surface.
[0033]
In order to increase the filtration accuracy in order to remove these foreign substances, a filtering material having a small transmission particle size or an electrostatic adsorption is often used. However, when these devices are used, the purification performance tends to decrease when the flow velocity in the purification device portion is increased, so that the ability to stir the operating oil in the switch oil tank is limited.
[0034]
The present embodiment is intended to solve such a problem, and the second suction device 251 functioning as a stirring device having no filtering function is replaced with the first suction device 250 and the first suction device 250. This is attached in parallel with the foreign matter removing device 450 of FIG.
[0035]
In the present embodiment having such a configuration, a part of the hydraulic oil introduced into the oil supply hose 200 from the oil tank 34 is guided to the second suction device 251 for stirring via the second oil supply hose 201. The oil is returned to the oil tank 34 via the second return hose 301. On the other hand, the rest of the hydraulic oil introduced from the oil tank 34 into the oil supply hose 200 is introduced into the first suction device 250 and the first foreign matter removing device 450, as in the first embodiment, to remove foreign matter.
[0036]
In this way, the inside of the switch oil tank 34 is strongly agitated, and the bottom sediment and wall deposits are dispersed in the hydraulic oil and guided to the first foreign matter removing device 450, so that the efficiency of waste matter removal is further improved. be able to.
[0037]
As such a stirrer, a screw-type stirrer or the like is also commercially available, but it is not preferable to mount such a stirrer during operation of the device because the number of devices to be brought into the mechanism box increases. In addition, in consideration of the static electricity, heating, and the like of the working oil, it may be better not to stir too strongly for a long time. According to the test results of the present inventors, the number of particles in the oil almost reached the upper limit when stirring was continued for about 10 minutes at such a flow rate that the entire amount of hydraulic oil in the oil tank could be replaced in 3 minutes.
[0038]
Therefore, the sedimentable foreign matter and the adhered foreign matter can be more efficiently removed by performing the work after performing such agitation before the purification treatment, or by performing the agitation and the purification alternately. In FIG. 2, only two suction and discharge hoses are installed in the switch oil tank. However, if the working conditions permit, it is also possible to independently install suction and discharge hoses for stirring.
[0039]
(3) Third embodiment
Next, a third embodiment of the apparatus for purifying hydraulic oil according to the present invention will be described with reference to FIG. This embodiment is a modification of the second embodiment. For example, a coarse suction device having a transmission particle size of 50 μm or more, a centrifugal removal device such as a cyclone, or a magnetic force is applied to the second suction device 251. A second foreign matter removing device (not shown) such as an adsorption device using the above is connected in series.
[0040]
According to the present embodiment having such a configuration, the second foreign matter removing device connected in series to the second suction device 251 can remove a foreign material having a large particle size or a foreign material having an extremely high specific gravity. In particular, an adsorption device using magnetic force adsorbs magnetic metallic foreign matter, but the metallic foreign matter has a high specific gravity. In a flow device, it is possible to carry the flow to the capture device.
[0041]
By doing so, it is possible to remove foreign substances and metal components having a large particle diameter in advance, and at the same time, to homogenize the particle diameter of the circulating foreign substances. It also has the effect of preventing short circuits and the like, and is effective in improving efficiency.
[0042]
(4) Fourth embodiment
In the above embodiment, the removal of foreign matter in the hydraulic oil has been described.However, when such a foreign matter removal in the oil is performed, the mechanism box of the operating device is to be operated in an open state, For several hours required for the circulation cleaning work, it is necessary to take measures to protect the equipment from weather changes and the like. The present embodiment proposes a countermeasure for this.
[0043]
That is, in the present embodiment, as shown in FIG. 3, an opening 604 is formed in the door member 600, and a through plate 603 having a hole 605 in the center is detachably attached to the opening 604. . The through plate 603 is attached via a rubber packing 601 and a wedge 602 so that the opening 604 can be closed. During the cleaning operation, the two suction hoses are inserted into the holes 605 of the through plate 603, and after the operation is completed, a closing plate (not shown) having no holes is attached. Is configured.
[0044]
In addition, as this penetration plate, a transparent window provided in the mechanism box door for observing the inside of the switch can also be used. This window is generally constructed by attaching a plastic plate or a tempered glass plate to an iron plate door with rubber packing.
[0045]
According to the present embodiment having such a configuration, it is not necessary to open the door even if the hydraulic oil treatment is performed for a long time during use of the device, and work can be performed without adversely affecting the inside of the device. .
[0046]
(5) Fifth embodiment
The present embodiment provides a method for appropriately determining the timing of performing the foreign matter removal in oil described in the above embodiment. FIG. 4 is a side view showing an example of the internal arrangement of the switch mechanism box, and FIG. 5 is a front view.
[0047]
Generally, the oil tank 34 is provided with a transparent oil level gauge 36 for checking the oil level. A vertical hole communicating with the inside of the oil tank is formed above and below the oil level gauge 36, and hydraulic oil is guided into the oil level gauge 36. Therefore, a very small part of the hydraulic oil in the oil tank 34 can be directly visually confirmed from this part.
[0048]
The present inventors have paid attention to this point, and provided a light source (not shown) capable of irradiating uniform light from behind the oil level gauge 36 or from the side of the viewing position. The light source needs to have a uniform and stable light amount, and is preferably a xenon lamp, a halogen lamp, or a fluorescent lamp.
[0049]
Then, such a light source is irradiated from the side surface or the back surface of the oil level gauge 36 to observe the working oil in the oil level gauge 36. In general, the deteriorated hydraulic oil often has reduced transparency, and the altered part has a slight difference in specific gravity from the hydraulic oil or has a tendency to aggregate foreign substances with polarity. By comparing with a photograph of the deteriorated hydraulic oil model taken under the irradiation condition, a difference in transmitted light and a difference in transparency can be determined.
[0050]
In this way, when deteriorating substances in oil are confirmed, if the purification operation of the first embodiment to the third embodiment is performed within a predetermined period, the amount of work is reduced as compared with the case of performing the operation periodically. It can be reduced and more efficient maintenance becomes possible.
[0051]
(6) Sixth embodiment
The present embodiment also provides a method for appropriately determining the timing of performing the foreign matter removal in oil described in the above embodiment.
That is, the degraded hydraulic oil that most directly affects the performance of the switch is a foreign matter that causes the strainer to be blocked. As a simple method of confirming the generation of foreign matter, an appropriate amount of hydraulic oil is sampled from the bottom of the oil tank and passed through a wire mesh having openings of 50 μm to 150 μm.
[0052]
In the test of the present inventors, it usually passes in a few seconds regardless of the number of repetitions per 100 ml. Confirmed that it will disappear. The degree varies depending on the mesh size of the strainer to be targeted, but if the sampling and passing are repeated about three times and the passing time is clearly prolonged, it can be determined that the influence occurs.
[0053]
When a foreign substance is found by such a check, the adhesion of the foreign substance can clearly be confirmed on the mesh. As a result of such a simple determination, when a foreign substance is confirmed, if the cleaning operation of the first to third embodiments is performed, the amount of work can be reduced as compared with a case where the cleaning is performed periodically. , More efficient maintenance becomes possible.
[0054]
(7) Seventh embodiment
The present embodiment also provides a method for appropriately determining the timing of performing the foreign matter removal in oil described in the above embodiment.
Generally, the precipitates in the oil are dispersed to some extent in the oil, so that the strainers are not suddenly clogged, but are gradually closed. In the hydraulic circuit, the strainer transmits only the pressure difference between the atmospheric pressure and the negative pressure due to the suction of the pump. Although the pressure difference before and after increases, the strainer generates only a pressure difference of at most 1 atm. This strainer blockage has a direct effect on the pump output.
[0055]
In the switchgear, the equipment is in a standby state, but there is always an oil leak between high and low pressure. I have. Since the automatic operation for replenishment is performed by the pressure switch, the replenishment operation time is substantially constant if the pump performance is constant. Therefore, by providing an integrating timer and an operating counter in the pump operating circuit, it is possible to obtain an integrated operating time of the pump when the pump is operated a predetermined number of times.
[0056]
By performing such recording, when the operating time of the pump is extended, the blockage of the strainer can be detected as a decrease in pump performance. When the purifying operation of the first to third embodiments is performed when the pump replenishment operation time exceeds a certain value, the subsequent blocking element can be removed. In the case of a switch such as a circuit breaker, it is desirable to take measures when the time is extended by 20% to 50% or more. However, this value can be selected as appropriate according to the operation status of the equipment and the setting of the margin. .
[0057]
(8) Eighth embodiment
The present embodiment also provides a method for appropriately determining the timing of performing the foreign matter removal in oil described in the above embodiment.
This embodiment utilizes the property that the sticky foreign matter easily adheres to the metal wall near the oil surface. That is, the additives, particularly the degraded products of the extreme pressure agent system, easily adhere to the metal wall surface, and the foreign matters having these as nuclei have the wall surface adhesion. However, in a large amount of oil, the deteriorating substances are attracted to each other more than the wall surface to form an aggregate, so that clear wall adhesion is hardly visible.
[0058]
On the other hand, near the oil level, the oil level constantly fluctuates within a certain range, even for stationary equipment, due to the effect of the pump refilling operation described above. I do. For this reason, the adhesion to the wall surface tends to appear more easily than in oil.
[0059]
Furthermore, because of the gas-liquid interface, oxidation and hydrolysis reactions are also likely to occur, and various foreign substances adhere to the wall near the liquid surface. When this wall surface is checked by inserting a fiberscope or the like, the number of degraded products can be clearly determined. High performance fiberscopes can directly observe strainers in oil, but high performance fiberscopes are expensive and difficult to determine deposits similar in hue to hydraulic oil.
[0060]
However, it is possible to observe the aerial part slightly above the liquid level with an ordinary fiberscope, and it is easy to determine the hue because a similar thing to the liquid level can be seen on the liquid level. Although it is difficult to evaluate the absolute amount, this is enough to provide an indication of when to perform the above-mentioned cleaning treatment.
[0061]
(9) Other embodiments
The present invention is not limited to the above-described embodiment, and the first and second foreign matter removing devices can be replaced with appropriate devices according to the foreign matter to be removed. Further, it is needless to say that not only the method of judging the timing of performing the foreign matter removal in oil shown in the fifth to eighth embodiments is used alone, but also a multifaceted judgment can be made by using it in combination. .
[0062]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a hydraulic oil purifying device of a hydraulic operating device capable of removing wastes in hydraulic oil in a device operation state. Further, it is possible to provide a method of purifying a hydraulic oil of a hydraulic operating device, which can detect an abnormal state of the hydraulic oil in an operation state of the device and purify the hydraulic oil at an appropriate timing.
[0063]
As a result, the work such as changing the hydraulic oil, which had been performed at the same time as the stoppage of the equipment, can be performed during the operation of the equipment or at a very short opportunity to stop the equipment. The period can be extended, and the operation efficiency of the switch can be increased.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a configuration of a first embodiment of a hydraulic oil purifying device for a hydraulic operating device according to the present invention.
FIG. 2 is a schematic diagram showing a configuration of a second or third embodiment of a hydraulic oil purifying device for a hydraulic operating device according to the present invention.
FIG. 3 is a schematic diagram showing a configuration of a fourth embodiment of a hydraulic oil purifying device for a hydraulic operating device according to the present invention.
FIG. 4 is a side view showing an example of the internal arrangement of the power switch mechanism box.
FIG. 5 is a front view showing an example of the internal arrangement of the power switch mechanism box.
FIG. 6 is an oil pipe system diagram showing a configuration of a general hydraulic operating mechanism of a switch.
[Explanation of symbols]
1 ... Interruption part
11 ... Switch contact in the breaking section
2. Operating cylinder (actuator)
21 ... Cylinder
22 ... Piston
27, 28 ... Solenoid valve
211 ... Piston rod
3. Pump related parts
31 ... Hydraulic pump
32 ... Electric motor
33 ... Pressure switch
34 ... oil tank
35 ... Oil level gauge
36 ... Pressure gauge
37 ... High pressure piping
38, 39 ... stop valve
310 ... check valve
311… Relief valve
312 ... Joint
313 ... Line filter
314 ... Strainer
315 ... oil level switch or float switch
316 ... Oil and respirator
320: Low pressure piping
4. Accumulator (accumulator)
9… Mechanism box
100 ... oil level
200 ... refueling hose
300 ... Return hose
250 ... suction device
251—second suction device
450 ... Foreign matter removal device
500 ... reserve hydraulic oil container
600 ... door member
601 Rubber packing
602: wedge
603 ... through plate
604: Opening
605 ... hole

Claims (8)

油圧操作装置の機構箱の外部に、互いに直列に接続した第1の吸い込み装置と第1の異物除去装置を設置し、
前記油圧操作装置内の作動油を、給油ホースを介して前記第1の吸い込み装置に導入し、
前記第1の異物除去装置を経由した作動油を、戻りホースを介して、前記油圧操作装置に戻すように構成したことを特徴とする油圧操作装置の作動油浄化装置。
Outside the mechanism box of the hydraulic operating device, a first suction device and a first foreign matter removing device connected in series with each other are installed,
Hydraulic oil in the hydraulic operating device is introduced into the first suction device via an oil supply hose,
A hydraulic oil purifying device for a hydraulic operating device, wherein the hydraulic oil passing through the first foreign matter removing device is returned to the hydraulic operating device via a return hose.
前記第1の吸い込み装置及び第1の異物除去装置と並列に、第2の吸い込み装置を配設し、前記第1の吸い込み装置と前記第2の吸い込み装置を、同時に又は交互に運転するように構成したことを特徴とする請求項1に記載の油圧操作装置の作動油浄化装置。A second suction device is provided in parallel with the first suction device and the first foreign matter removal device, and the first suction device and the second suction device are operated simultaneously or alternately. The hydraulic oil purifying device for a hydraulic operating device according to claim 1, wherein the device is configured. 前記第2の吸い込み装置に、第2の異物除去装置を直列に接続したことを特徴とする請求項2に記載の油圧操作装置の作動油浄化装置。The hydraulic oil purifying device for a hydraulic operating device according to claim 2, wherein a second foreign matter removing device is connected in series to the second suction device. 前記油圧操作装置の機構箱に、前記給油ホース及び戻りホースを挿入することができる開口部を設け、この開口部を前記両ホースを取り付けた状態で閉止できるように構成したことを特徴とする請求項1乃至請求項3のいずれか一に記載の油圧操作装置の作動油浄化装置。The mechanism box of the hydraulic operating device is provided with an opening through which the oil supply hose and the return hose can be inserted, and the opening can be closed with both hoses attached. The hydraulic oil purifying device for a hydraulic operating device according to any one of claims 1 to 3. 油圧操作装置の油槽に設けられた油面計に、その背面または側面から光を照射して油面計内の作動油を観察し、作動油の不均一性を確認した場合に、作動油の浄化作業が必要であると判断することを特徴とする油圧操作装置の作動油浄化方法。The oil level gauge provided in the oil tank of the hydraulic operating device is irradiated with light from the back or side to observe the hydraulic oil in the oil level gauge. A method of purifying hydraulic oil for a hydraulic operating device, comprising determining that a cleaning operation is necessary. 油圧操作装置の油槽の底部から作動油を採取し、目開き50μm乃至150μmの濾過部材を透過させ、この時の透過時間が所定時間を超えた場合、あるいは網目上に異物を確認した場合に、作動油の浄化作業が必要であると判断することを特徴とする油圧操作装置の作動油浄化方法。Hydraulic oil is collected from the bottom of the oil tank of the hydraulic operating device and is passed through a filter member having an aperture of 50 μm to 150 μm.If the permeation time at this time exceeds a predetermined time, or if foreign matter is confirmed on the mesh, A method of purifying hydraulic oil for a hydraulic operating device, comprising determining that a cleaning operation of hydraulic oil is necessary. 油圧操作装置のポンプの自動運転回路にポンプ運転時間計とポンプ運転回数計を設け、所定期間のポンプ運転時間が、使用初期のポンプ運転時間の所定倍数を超えた場合に、作動油の浄化作業が必要であると判断することを特徴とする油圧操作装置の作動油浄化方法。A pump operation time meter and a pump operation frequency counter are provided in the automatic operation circuit of the pump of the hydraulic operating device. The method for purifying hydraulic oil of a hydraulic operating device, comprising: 油圧操作装置の油槽の開口部からファイバースコープを挿入し、常時、油面付近の油槽壁面や油槽内構造物側面を観察し、析出物の付着を認めた場合に、作動油の浄化作業が必要であると判断することを特徴とする油圧操作装置の作動油浄化方法。A fiberscope is inserted from the opening of the oil tank of the hydraulic operating device, and the oil tank wall surface near the oil surface and the side of the structure inside the oil tank are constantly observed. A method for purifying hydraulic oil of a hydraulic operating device, characterized in that
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US8586491B2 (en) 2005-11-04 2013-11-19 Ocv Intellectual Capital, Llc Composition for high performance glass, high performance glass fibers and articles therefrom
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