JP2004084688A - Filter device of sealing gas - Google Patents

Filter device of sealing gas Download PDF

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Publication number
JP2004084688A
JP2004084688A JP2002242512A JP2002242512A JP2004084688A JP 2004084688 A JP2004084688 A JP 2004084688A JP 2002242512 A JP2002242512 A JP 2002242512A JP 2002242512 A JP2002242512 A JP 2002242512A JP 2004084688 A JP2004084688 A JP 2004084688A
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Japan
Prior art keywords
gas
flow path
filter device
filter
container
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JP2002242512A
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Japanese (ja)
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JP4333101B2 (en
Inventor
Haruyoshi Fukuoka
福岡 玄義
Susumu Iwai
岩井 進
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NIPPON JOHN KUREEN KK
Eneos Corp
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NIPPON JOHN KUREEN KK
Nippon Petroleum Refining Co Ltd
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  • Mechanical Sealing (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter device which sufficiently maintaining cleanliness even in the case of buffer gas containing much liquid part without greatly remodeling the situation around the device. <P>SOLUTION: The flow path 7 of buffer gas from an inflow port 70 to an outflow port 79 is formed in a container 2. Two cylindrical filter elements 5 dividing the flow path into an upstream side and a downstream side are arranged in series in the longitudinal direction along the flow path 7, and the buffer gas is sequentially cleaned with respective elements. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、非接触メカニカルシールに導入されるシール用ガスの清浄化に好適なフィルター装置に関する。
【0002】
【従来の技術】
コンプレッサ等における回転軸とケーシング間を密封する非接触メカニカルシールは既に提供されており、ガスを直接シールするドライガスシールとしては、遠心コンプレッサーをはじめ多くの回転機械に適用されている。
図5はその一例を示したものであり、回転軸100に密封固定したメイティングリング102とシールハウジング104に密封装着し且つ押圧手段105にて軸方向へ付勢したプライマリーリング103との対面するシール面102a、103aよりシール部106(107)が構成され、各シール面102a、103aの何れか一方のシール面に、相対的回転方向に対して前進角を有する複数の螺旋溝を円周方向に一定間隔で設けて封入流体をシール面102a、103a間に圧送することで中心に向かう動圧が発生し、この動圧により両シール面間にミクロン単位のギャップを生じさせて非接触状態を保持して高周速回転を可能としたものである。
【0003】
図示した非接触メカニカルシールBはタンデム式と呼ばれ、二個のシール部106、107を並べてシールカートリッジを構成したものであり、機内側のシール部106(主シール部)でシールを行い、大気側のシール部107(補助シール部)はリークガスが直接大気側に出ることを制限している。
シール部106に供給される封入流体(バッファーガス)は導配管108を通じて導入されるとともに、機内側ラビリンス112より機内側に排出することで機内側ガスの侵入を防止しており、シール部106を通過したリークガスは、中間室111より導配管109を介してフレアー等の図示しない排気管に導かれる。
また、大気側ラビリンス113には導配管110よりパージガスが供給され、大気側のベアリング等の潤滑油のミスト等の侵入を防止するとともにリークガスの大気中への漏れを防止している。
【0004】
シール部106に供給されるバッファーガスは、異物や液分のない清浄なガスとする必要がある。特にガス中の液分は、シール面102a、103aに入り込むことで当該シール面を発熱させ、この熱によりシール面外径側の隙間が広がり、リークガス流量が増加するといった不都合が生じる。このため、バッファーガスの導配管108にはフィルター部Aが設けられ、取扱うガスが液体分を同伴している可能性が高い場合は、高い濾過精度で液体分除去性能をもつコアレッシングタイプのエレメントが使用される。
【0005】
【発明が解決しようとする課題】
ところで、バッファーガスとしてシール対象であるコンプレッサーの圧縮ガスを用いる場合、当該ガス中には液分が多く含まれることから、前記フィルター部Aで単に一つのフィルターを通すのみでは充分な清浄度が得られない。この対策としては、エレメントサイズを大きくしてエレメントの通過流速を下げ、捕捉効率を改善することや、図6に示すように、エレメント5を備えたフィルター装置101を二台直列に接続することが試みられてきた。
【0006】
しかしながら、エレメントサイズの増大には限界があり、また、二台直列に接続する対策ではバッファーガスの液分の影響は少なくできるものの主として設置スペース上の理由からフィルター装置101まわりの装置状況を大幅に改造する必要が生じ、現実的な対処法ではなかった。
【0007】
本発明は係る現況に鑑み為されたものであり、装置まわりの状況を大幅に改造することなく、バッファーガスに液分が多く含まれる場合も充分な清浄度を確保できるフィルター装置を提供せんとするものである。
【0008】
【課題を解決するための手段】
すなわち本発明は、ドライガスシールを成す非接触メカニカルシールに供給されるシール用ガスを予め濾過或いは液分除去して清浄化するためのフィルター装置であって、流入口と流出口を備えた容器内に、該流入口から流出口に至る前記シール用ガスの流路を形成するとともに、前記流路を上流側と下流側に区分するフィルターエレメントを当該流路に沿って直列に複数配置してなり、前記シール用ガスを各エレメントで順次清浄化することを特徴とするシール用ガスのフィルター装置を提供する。
【0009】
このようなフィルター装置にあっては、単一エレメント構造のフィルター装置を二台直列に接続していた従来の使用法と同等又はそれ以上の清浄化効果が期待できるとともに、前記二台直列接続した場合における設置スペースの増大とそれに伴う装置まわりの大幅な改造が回避される。
【0010】
円筒状の前記容器内に、流路を介して互いに連通した上部流通空間及び下部流通空間を設けるとともに、これら各流通空間に、それぞれシール用ガスを径方向に通過させる円筒状のフィルターエレメントを同一直線上に配置してなるものでは、コンパクトな構造が維持される。
【0011】
各フィルターエレメントが互いに同種のエレメントであるものでは、ガス中に粒子分が多く、捕捉した粒子分によりエレメントが目詰まりして破損しても、二段目のエレメントがバックアップとして同様に機能し、ドライガスシールが確実に保護される。
【0012】
前記フィルターエレメントが、径方向内側から外側に向けてシール用ガスを通過させ、ガス中の液体分を捕捉する円筒状のコアレッサー型フィルターエレメントであり、前記流入口を上部流通空間に配置したエレメント内側流路に連通させるとともに、当該上部流通空間のエレメント外側流路を下部流通空間に配置したエレメントの内側流路に連通させ、前記流出口を下部流通空間のエレメント外側流路に連通させ、容器底部に同じくエレメント外側流路に連通するドレン排出口を設けてなるものでは、二台直列接続した従来のものと異なり、上部エレメントで捕捉したドレンがガスの流れに沿って下部に導かれることから、上部流通空間にドレンが滞留したり、同伴すること等が回避され、除去されるドレン量は従来の二台接続方法よりも更に増大できる。
【0013】
前記流出口に通じる容器内面側の開口部に対して、本体内壁との間に流通空間を形成する凹部を外面側に備え、且つ、該流通規制部材の前記開口部と異なる高さ位置に、エレメント外側流路より前記流通空間へ処理ガスを導入するための多孔部を穿設した略筒状の流通規制部材を覆設してなり、前記エレメントを通過した流体を前記多孔部を介して流通空間に導き、容器内面に沿って一旦軸方向に流通させた後、前記流出口より排出してなるものでは、エレメントを通過した僅かなミストやドレンが前記流出口に至ることを極力防止できるとともに、万一エレメントが破損しても破片が前記開口部に進入することが防止される。
【0014】
エレメントを通過した清浄ガスの一部を、前記ドレン排出口を通じて排出させる排出手段を設け、当該排出される清浄ガスの流れにより容器内面に付着したドレンを排出口へ導いてなるものでは、容器内面に付着したドレンがガスの流れにより流出口に導かれてしまうことが防止でき、捕捉したドレンを確実に除去できる。
【0015】
前記容器を、前記下部流通空間が内面側に形成され、外周壁に流入口及び流出口が形成された筒状の容器本体と、前記上部流通空間が内面側に形成された同じく筒状の蓋体とより構成し、それぞれの開口端部に形成されたフランジを貫通するボルトによって互いに固定されるものでは、エレメント交換が容易であるとともに、状況に応じて上部のエレメントを取り除き、前記蓋体に代えて例えば板状の部材を取付けることで、単一エレメント構造のコンパクトなフィルター装置に容易に構成変更できる。
【0016】
【発明の実施の形態】
次に、本発明の実施形態を添付図面に基づき詳細に説明する。
【0017】
図1は、本発明のフィルター装置の内部構造を示す説明図であり、図1〜5は実施形態を示し、図中符号1はフィルター装置、2は容器、5はフィルターエレメント、7は流路をそれぞれ示している。
【0018】
本発明に係るフィルター装置1は、図5に示すように導配管108に介装され、ドライガスシールを成す非接触メカニカルシールBのシール部106に供給されるシール用ガスを予め濾過或いは液分除去して清浄化するための装置であり、本実施形態では、非接触メカニカルシールBはコンプレッサー用軸封装置であり、フィルター装置1はシール用ガスであるバッファーガスを清浄化する。
フィルター装置1は、図1に示すように、流入口70と流出口79を備えた容器2内に、該流入口70から流出口79に至るバッファーガスの流路7を形成するとともに、前記流路を上流側と下流側に区分するフィルターエレメント5を当該流路7に沿って直列に複数配置し、前記バッファーガスを各エレメントで順次清浄化するものであり、二台直列接続していた従来の使用法と同等又はそれ以上の清浄化効果が得られる一方、設置スペースは従来に比べよりコンパクト化できるのである。
【0019】
尚、図5では、メイティングリング102とプライマリーリング103の対が軸方向に二対あるタンデム型の非接触メカニカルシールを示しているが、勿論メイティングリングとプライマリーリングが一対のシングル型のものでも良く、更に両シール面102a、103aとが接触して密封するものであっても良い。
【0020】
フィルター装置1(A)はバッファーガス供給配管上に二台並列に装備され、それぞれ運転用及び予備用としてバルブ操作により交互に切り替えて使用される。即ち運転用が目詰まりを生じた時点で予備用を運転用に切り替え、目詰まりを生じたエレメントを新品に交換し、これが予備用となる。当該フィルター部Aには差圧計付きで昇圧作動する差圧スイッチが設けられており、これによりエレメントの目詰まりを察知次第、予備のフィルターに切り替えられ、運転を止めることなく交換可能に構成されている。
【0021】
容器2は縦長な円筒形状であり、当該容器内には流通路74を介して互いに連通した上部流通空間24及び下部流通空間25が上下に設けられている。
具体的には、外周壁に流入管26及び流出管27を突設し、下部流通空間25を内側に有した筒状の容器本体21と、上部流通空間24を内側に有した同じく筒状の蓋体22とを、各開口端部に形成したフランジ21a、22aを貫通するボルトナットにより互いに着脱可能に組み付けて構成されており、これら各流通空間24、25には、バッファーガスを径方向に通過させ、異物や液分を捕捉する円筒状のフィルターエレメント5が同一直線上に配置されており、これにより上下二段のエレメント構造が内部構成されている。
【0022】
このようにフランジ構造とすれば、例えば図2に示すように、上部のエレメント5を取り除き、蓋体22の代わりに板状部材23を同じくフランジ21aにボルトナットで固定することにより、従来と同様の単一エレメントからなるフィルター装置1Aに容易に構成変更でき、高い濾過精度を必要としない場合など使用環境に応じて上記構成変更によりコンパクト化を図ることが可能となる。
【0023】
上下に直列配置したフィルターエレメント5、5は、使用環境に応じて適宜その種類を選択でき、本例では同種のエレメントを用いることで一段目となる上流側エレメントが捕捉粒子で目詰まりし閉塞して破損する事態が生じても、下流側のエレメントをバックアップとして同様の機能を担保し、ドライガスシールを確実に保護することとしている。
尚、二段目となる下部側に上部側よりも濾目の小さなものを用いたり、或いは上部側にコアレッサー型以外の濾過エレメントを用い且つ下部側に水分を捕捉するコアレッサー型を用いるなどの異種エレメントの組合せとすること等も勿論可能である。
【0024】
上下のエレメントには、それぞれ径方向内側から外側に向けてバッファーガスを通過させ、ガス中の液体分を捕捉する円筒状のコアレッサー型フィルターエレメント5が用いられている。
本実施例では清浄化の対象となるバッファーガスがコンプレッサーの圧縮ガスであるため、前記エレメントは、マイクログラスファイバーと樹脂の材質のコアレッシング機能付き二層構造とし、内径50.8mm、厚さ6.4mm、長さ230mm、粒子径0.1μmの除去効率93%、粒子径5μmの除去効率100%のエレメントが好適に用いられる。
【0025】
容器本体21の上端寄りには、蓋体22との組み合せにより内部形成される上部流通空間24と下部流通空間25とを区分するとともに上下端にそれぞれエレメントの支持用端部31、32を備えた扁平円柱状の支持部材3が内嵌されている。
前記支持部材3には、両端にネジ溝81、82が形成された支持杆8の一端を支持用端部31(32)の中央部に螺合して縦立させ、前記中央部の周囲に形成された段部33にエレメント一端部5aを係合して支持杆8と同軸に配置させるとともに、エレメント他端部5bに係合する止着部材83を支持杆先端のネジ溝82に螺着することで、当該エレメント5が前記支持杆8及び止着部材83を介して支持用端部31に固定される。
【0026】
支持部材3の外周面には前記本体内壁との間に環状空間を形成する凹溝30が設けられており、流入管26は前記環状空間に連通する位置に設けられている。また、当該支持部材3には、凹溝30の底面に開口し、上端略中央部の上部エレメント内側流路72に連通する流通路71が斜上方に穿設されており、流入管26先端の流入口70より導かれたバッファーガスは、前記流通路71を通じて上部エレメント5の内側流路72に導かれた後、該エレメント5を径方向に通過して濾過、清浄化される。
【0027】
また、同じく支持部材3には、上部エレメント外側流路73に開口し、下部エレメントの内側流路75に連通する流通路74が斜め下方に穿設され、下部流通空間25のエレメント外側流路76には流出管27が連通して設けられており、上部エレメントを通過したバッファーガスは前記流通路74を通じて下部エレメントの内側流路に導かれ、該エレメント5を径方向に通過して再度、濾過、清浄化された後、エレメント外側流路76より流出管27を通じて排出される。
このようにエレメントを縦方向に二個直列に配置した本発明においては、上部エレメントで捕捉されたドレンはガスの流れにより前記流通路74を通じて下部に導かれ、当該ドレン液が下部エレメント通過時に他の小さなドレン液滴を取り込むことにより、下部エレメントで捕獲できないドレン量が減少する。それにより除去されるドレン液自体も増大するために、ドレンの滞留や同伴が防止される。
【0028】
容器本体21内面側における流出管27の内面開口部79aが臨む部位には、本体内壁との間に流通空間を形成する凹部40を外面側に備えた筒状の流通規制部材4が覆設されており、該流通規制部材4の前記内面開口部79aと異なる高さ位置には、エレメント外側流路76より前記流通空間へバッファーガスを導入する多孔部41が穿設されている。導入されたバッファーガスは、容器内面に沿って一旦軸方向に流通された後に前記流出管27より排出されることから、当該迂曲流路を形成した流通規制部材によりエレメントを通過した僅かなミストやドレンが直接流出管27に入ることを極力防止するとともに、万一エレメントが破損した場合であっても当該破片が流出管27に入ることが回避される。
【0029】
本体容器21の底部にはドレン排出口90を備えた排出管28が設けられており、本例では、図3に示すように液面計LG付のドレンポット9を接続し、本体容器21よりドレンを連続排出している。尚、図4に示すようにドレンポットより絞り部91を介してフレアー等の排気管に少量のガスを放出し、エレメントを通過したバッファーガスの一部を前記ドレン排出口90を通じて排出させる排出手段を設けたものでは、当該排出される少量のバッファーガスの流れにより容器内面に付着したドレンが強制的に排出口へ導かれ、ドレンが内部に残留することや流出管27に進入するといった不都合が防止され、ドレンポットに確実に導くことが可能となる。
【0030】
フィルター装置1よりも下流側の導配管108は、スチームの抱線で加熱し、液分を気化するスチームトレース保温が施され、配管表面からの放熱とオリフィスや調整弁等の流量調整部での断熱膨張作用による温度降下に起因するミスト化やドレン化が防止されており、フィルター装置1の流出管27にも前記保温を施すことが好ましい。
【0031】
【発明の効果】
以上のように、本発明のフィルター装置によれば、バッファーガス中に液分が多く存在するような運転状況でも、単一エレメント構造のフィルター装置を二台直列に接続していた従来の使用法と同等又はそれ以上の清浄化効果が期待でき、リークガス流量を安定させることが可能となるとともに、前記二台直列接続した従来の場合における設置スペースの増大とそれに伴う装置まわりの大幅な改造が回避される。
【0032】
円筒状の前記容器内に、流路を介して互いに連通した上部流通空間及び下部流通空間を設けるとともに、これら各流通空間に、それぞれシール用ガスを径方向に通過させる円筒状のフィルターエレメントを同一直線上に配置したので、コンパクトな構造を維持できる。
【0033】
各フィルターエレメントが互いに同種のエレメントであるので、ガス中に粒子分が多く、捕捉した粒子分によりエレメントが目詰まりして破損しても、二段目のエレメントをバックアップとして同様に機能させ、ドライガスシールを確実に保護できる。
【0034】
フィルターエレメントが、径方向内側から外側に向けてシール用ガスを通過させ、ガス中の液体分を捕捉する円筒状のコアレッサー型フィルターエレメントであり、前記流入口を上部流通空間に配置したエレメント内側流路に連通させるとともに、当該上部流通空間のエレメント外側流路を下部流通空間に配置したエレメントの内側流路に連通させ、前記流出口を下部流通空間のエレメント外側流路に連通させ、容器底部に同じくエレメント外側流路に連通するドレン排出口を設けたので、二台直列接続した従来のものと異なり、上部エレメントで捕捉したドレンがガスの流れに沿って下部に導かれることから、上部流通空間にドレンが滞留したり、同伴すること等が回避され、除去されるドレン量を従来の二台接続方法よりも更に増大できる。
【0035】
前記流出口に通じる容器内面側の開口部に対して、本体内壁との間に流通空間を形成する凹部を外面側に備え、且つ、該流通規制部材の前記開口部と異なる高さ位置に、エレメント外側流路より前記流通空間へ処理ガスを導入するための多孔部を穿設した略筒状の流通規制部材を覆設してなり、前記エレメントを通過した流体を前記多孔部を介して流通空間に導き、容器内面に沿って一旦軸方向に流通させた後、前記流出口より排出することとしたので、エレメントを通過した僅かなミストやドレンが前記流出口に至ることを極力防止できるとともに、万一エレメントが破損しても破片が前記開口部に進入することを防止できる。
【0036】
エレメントを通過した清浄ガスの一部を、前記ドレン排出口を通じて排出させる排出手段を設け、当該排出される清浄ガスの流れにより容器内面に付着したドレンを排出口へ導くこととしたので、容器内面に付着したドレンがガスの流れにより流出口に導かれてしまうことを防止でき、捕捉したドレンを確実に除去できる。
【0037】
前記容器を、前記下部流通空間が内面側に形成され、外周壁に流入口及び流出口が形成された筒状の容器本体と、前記上部流通空間が内面側に形成された同じく筒状の蓋体とより構成し、それぞれの開口端部に形成されたフランジを貫通するボルトによって互いに固定することとしたので、エレメント交換が容易であるとともに、状況に応じて上部のエレメントを取り除き、前記蓋体に代えて例えば板状の部材を取付けることで、単一エレメント構造のコンパクトなフィルター装置に容易に構成変更できる。
【図面の簡単な説明】
【図1】本発明の実施形態に係るフィルター装置の内部構造を示す断面図。
【図2】単一エレメント構造に構成変更した様子を示す断面図。
【図3】排出管に接続したドレンポットを示す説明図。
【図4】バッファーガスの一部をドレン排出口より排出させる排出手段を示す説明図。
【図5】非接触メカニカルシールとフィルター部を示す説明図。
【図6】単一エレメント構造の従来のフィルター装置を二台直列に接続した例を示す断面図。
【符号の説明】
A フィルター部   B 非接触メカニカルシール
1 フィルター装置      2 容器
3 支持部材         4 流通規制部材
5 エレメント        5a 端部
5b 端部          7 流路
8 支持杆          9 ドレンポット
21 容器本体        21a フランジ
22 蓋体          22a フランジ
23 板状部材        24 流通空間
25 下部流通空間      26 流入管
27 流出管         28 排出管
30 凹溝          31 支持用端部
32 支持用端部       33 段部
40 凹部          41 多孔部
70 流入口         71 流通路
72 内側流路        73 外側流路
74 流通路         75 内側流路
76 外側流路        79 流出口
79a 内側開口部      81、82 ネジ溝
83 止着部材        90 ドレン排出口
91 絞り部         100 回転軸
101 フィルター装置    102a シール面
102 メイティングリング  103a シール面
103 プライマリーリング  105 押圧手段
104 シールハウジング   106 シール部
107 シール部       108 導配管
109 導配管        110 導配管
111 中間室        112 ラビリンス
113 ラビリンス
[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a filter device suitable for purifying a sealing gas introduced into a non-contact mechanical seal.
[0002]
[Prior art]
A non-contact mechanical seal for sealing between a rotary shaft and a casing in a compressor or the like has already been provided, and a dry gas seal for directly sealing gas has been applied to many rotary machines including a centrifugal compressor.
FIG. 5 shows an example of such a case, in which a mating ring 102 hermetically sealed to a rotating shaft 100 and a primary ring 103 hermetically mounted on a seal housing 104 and urged in the axial direction by a pressing means 105 face each other. A sealing portion 106 (107) is formed by the sealing surfaces 102a and 103a, and a plurality of spiral grooves having an advancing angle with respect to the relative rotation direction are formed on one of the sealing surfaces 102a and 103a in the circumferential direction. A fixed pressure is provided between the sealing surfaces 102a and 103a, and a dynamic pressure toward the center is generated. This dynamic pressure generates a micron-unit gap between the two sealing surfaces so that a non-contact state is generated. This allows the high peripheral speed rotation to be maintained.
[0003]
The illustrated non-contact mechanical seal B is called a tandem type and has a seal cartridge in which two seal portions 106 and 107 are arranged side by side. The side seal portion 107 (auxiliary seal portion) restricts the leak gas from flowing directly to the atmosphere side.
The sealed fluid (buffer gas) supplied to the seal portion 106 is introduced through the conduit 108 and is discharged from the inside labyrinth 112 to the inside of the machine to prevent the inboard gas from entering. The leak gas that has passed is guided from the intermediate chamber 111 to a not-shown exhaust pipe such as a flare via a conduit 109.
A purge gas is supplied to the atmosphere-side labyrinth 113 from the conduit 110 to prevent entry of mist or the like of lubricating oil from bearings or the like on the atmosphere side and leakage gas to the atmosphere.
[0004]
The buffer gas supplied to the seal portion 106 needs to be a clean gas free of foreign matter and liquid. In particular, the liquid component in the gas enters the sealing surfaces 102a and 103a to generate heat on the sealing surfaces, and the heat causes the gap on the outer diameter side of the sealing surface to widen, thereby causing a problem that the leak gas flow rate increases. For this reason, the filter section A is provided in the buffer gas introducing pipe 108, and when there is a high possibility that the gas to be handled is accompanied by a liquid component, a coalescing type element having a high filtration accuracy and a liquid component removing performance. Is used.
[0005]
[Problems to be solved by the invention]
By the way, when the compressed gas of the compressor to be sealed is used as the buffer gas, since a large amount of liquid is contained in the gas, sufficient cleanliness can be obtained simply by passing one filter through the filter part A. I can't. As a countermeasure for this, it is possible to increase the element size to reduce the flow velocity of the element and improve the trapping efficiency, or to connect two filter devices 101 each having the element 5 in series as shown in FIG. Have been tried.
[0006]
However, there is a limit to the increase in the element size, and the measures connected in series can reduce the influence of the liquid content of the buffer gas, but the condition of the device around the filter device 101 is largely reduced mainly because of the installation space. It needed to be remodeled and was not a practical solution.
[0007]
The present invention has been made in view of the current situation, and it is necessary to provide a filter device that can ensure sufficient cleanliness even when a large amount of liquid is contained in a buffer gas without significantly modifying the surroundings of the device. Is what you do.
[0008]
[Means for Solving the Problems]
That is, the present invention is a filter device for preliminarily filtering or removing a sealing gas supplied to a non-contact mechanical seal forming a dry gas seal and purifying the gas, and a container having an inlet and an outlet. Inside, while forming a flow path of the sealing gas from the inlet to the outlet, a plurality of filter elements for dividing the flow path into an upstream side and a downstream side are arranged in series along the flow path. And a sealing gas filter device characterized in that the sealing gas is sequentially cleaned by each element.
[0009]
In such a filter device, a cleaning effect equivalent to or more than the conventional usage in which two single-element structure filter devices are connected in series can be expected, and the two devices are connected in series. In such a case, an increase in installation space and a corresponding remodeling around the device are avoided.
[0010]
In the cylindrical container, an upper circulation space and a lower circulation space which are communicated with each other via a flow path are provided, and a cylindrical filter element which allows a sealing gas to pass in a radial direction is provided in each of these circulation spaces. In the case of being arranged on a straight line, a compact structure is maintained.
[0011]
In the case where each filter element is the same kind of element, the second-stage element functions similarly as a backup even if the element is clogged and broken due to a large amount of particles in the gas and the captured particles, Dry gas seal is reliably protected.
[0012]
The filter element is a cylindrical coalescer type filter element that passes a sealing gas from a radially inner side to an outer side and captures a liquid component in the gas, wherein the inflow port is disposed in an upper circulation space. While communicating with the inner flow path, the element outer flow path of the upper circulation space is communicated with the inner flow path of the element disposed in the lower circulation space, and the outlet is communicated with the element outer flow path of the lower circulation space, In the case where the bottom has a drain outlet that communicates with the outside flow path of the element, unlike the conventional case where two units are connected in series, the drain captured by the upper element is guided to the lower part along the gas flow. Drains are prevented from staying in or entraining in the upper circulation space, and the amount of drain removed is smaller than that of the conventional two-unit connection method. It can be increased to.
[0013]
For the opening on the inner surface side of the container that communicates with the outlet, a concave portion that forms a flow space between the inner wall of the main body and the outer surface side is provided, and at a height different from the opening of the flow restricting member, A substantially cylindrical flow regulating member having a perforated portion for introducing a processing gas into the flow space from the element outside flow path is covered, and the fluid passing through the element flows through the perforated portion. After being introduced into the space, and once circulated in the axial direction along the inner surface of the container, and discharged from the outlet, it is possible to prevent a slight mist or drain passing through the element from reaching the outlet as much as possible. Even if the element is damaged, fragments are prevented from entering the opening.
[0014]
Discharging means for discharging a part of the clean gas passing through the element through the drain discharge port is provided, and the flow of the discharged clean gas guides the drain adhered to the inner surface of the container to the discharge port. It is possible to prevent the drain adhering to the gas from being led to the outlet by the flow of the gas, and the trapped drain can be reliably removed.
[0015]
The container includes a cylindrical container body in which the lower circulation space is formed on the inner surface side and an inlet and an outlet formed in an outer peripheral wall, and a cylindrical lid in which the upper circulation space is formed on the inner surface side. In the one that is composed of a body and is fixed to each other by bolts penetrating through the flanges formed at the respective open ends, the element can be easily replaced, and the upper element is removed as necessary, and Alternatively, for example, by attaching a plate-shaped member, the configuration can be easily changed to a compact filter device having a single element structure.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[0017]
FIG. 1 is an explanatory view showing the internal structure of a filter device of the present invention. FIGS. 1 to 5 show an embodiment, in which reference numeral 1 denotes a filter device, 2 denotes a container, 5 denotes a filter element, and 7 denotes a flow path. Are respectively shown.
[0018]
As shown in FIG. 5, the filter device 1 according to the present invention filters or separates a sealing gas supplied to the sealing portion 106 of the non-contact mechanical seal B forming a dry gas seal in advance, as shown in FIG. In this embodiment, the non-contact mechanical seal B is a compressor shaft sealing device, and the filter device 1 purifies a buffer gas, which is a sealing gas.
As shown in FIG. 1, the filter device 1 forms a buffer gas flow path 7 from the inflow port 70 to the outflow port 79 in a vessel 2 having an inflow port 70 and an outflow port 79, and Conventionally, a plurality of filter elements 5 for dividing a passage into an upstream side and a downstream side are arranged in series along the flow path 7, and the buffer gas is sequentially cleaned by each element. While a cleaning effect equal to or more than that of the method of using is obtained, the installation space can be made more compact than before.
[0019]
Note that FIG. 5 shows a tandem type non-contact mechanical seal in which the pair of the mating ring 102 and the primary ring 103 is two pairs in the axial direction. Alternatively, the sealing surfaces 102a and 103a may be brought into contact with each other for sealing.
[0020]
Two filter devices 1 (A) are mounted in parallel on the buffer gas supply pipe, and are alternately used for operation and standby by operating a valve. That is, when the operation is clogged, the spare is switched to the operation, and the clogged element is replaced with a new one, which becomes the spare. The filter unit A is provided with a differential pressure switch that operates with a differential pressure gauge and operates to increase the pressure. As soon as the clogging of the element is detected, the filter is switched to a spare filter so that the filter can be replaced without stopping operation. I have.
[0021]
The container 2 has a vertically long cylindrical shape, and an upper circulation space 24 and a lower circulation space 25 communicating with each other via a flow passage 74 are vertically provided in the container.
Specifically, an inflow pipe 26 and an outflow pipe 27 are protruded from the outer peripheral wall, and a cylindrical container body 21 having a lower circulation space 25 inside, and a cylindrical container body having an upper circulation space 24 inside. The lid 22 is detachably assembled to each other with bolts and nuts penetrating through the flanges 21a, 22a formed at the respective open ends. Cylindrical filter elements 5 that pass through and capture foreign substances and liquid components are arranged on the same straight line, thereby internally forming an upper and lower two-stage element structure.
[0022]
With such a flange structure, for example, as shown in FIG. 2, the upper element 5 is removed, and the plate member 23 is fixed to the flange 21a instead of the lid 22 with a bolt and a nut as in the conventional case. The configuration can be easily changed to the filter device 1A composed of a single element, and the configuration can be made compact by changing the configuration according to the use environment such as when high filtration accuracy is not required.
[0023]
The type of the filter elements 5, 5 arranged in series vertically can be selected as appropriate according to the use environment. In this example, the use of the same type of element causes the upstream element, which is the first stage, to be clogged and clogged by trapped particles. Even if a breakage occurs, the same function is secured by using the downstream element as a backup, and the dry gas seal is reliably protected.
In addition, a filter having a smaller filtration than the upper side is used for the lower side which is the second stage, or a filter element other than the coalescer type is used for the upper side and a coalescer type for capturing moisture is used for the lower side. Of course, it is also possible to use a combination of different kinds of elements.
[0024]
For the upper and lower elements, a cylindrical coalescer type filter element 5 for passing a buffer gas from a radially inner side to an outer side and capturing a liquid component in the gas is used.
In this embodiment, since the buffer gas to be cleaned is the compressed gas of the compressor, the element has a two-layer structure with a coalescing function of micro glass fiber and resin material, an inner diameter of 50.8 mm and a thickness of 6 mm. An element having a removal efficiency of 93% with a diameter of 0.4 mm, a length of 230 mm, a particle diameter of 0.1 μm, and a removal efficiency of 100% with a particle diameter of 5 μm is suitably used.
[0025]
Near the upper end of the container body 21, an upper flow space 24 and a lower flow space 25 formed internally by combination with the lid 22 are divided, and support ends 31 and 32 of the elements are provided at upper and lower ends, respectively. A flat cylindrical support member 3 is fitted inside.
One end of a support rod 8 having screw grooves 81 and 82 formed at both ends of the support member 3 is screwed into a central portion of the support end portion 31 (32) to stand upright. The one end 5a of the element is engaged with the formed step 33 so as to be coaxial with the support rod 8, and a fastening member 83 engaged with the other end 5b of the element is screwed into the screw groove 82 at the tip of the support rod. By doing so, the element 5 is fixed to the support end 31 via the support rod 8 and the fastening member 83.
[0026]
The outer peripheral surface of the support member 3 is provided with a concave groove 30 forming an annular space between the support member 3 and the inner wall of the main body, and the inflow pipe 26 is provided at a position communicating with the annular space. Further, the support member 3 has a flow passage 71 which is opened at the bottom surface of the concave groove 30 and communicates with the upper element inner flow passage 72 substantially at the center of the upper end. The buffer gas guided from the inflow port 70 is guided to the inside flow path 72 of the upper element 5 through the flow path 71, and then passes through the element 5 in the radial direction to be filtered and purified.
[0027]
Similarly, in the support member 3, a flow path 74 that opens to the upper element outer flow path 73 and communicates with the lower element inner flow path 75 is formed obliquely downward, and the element outer flow path 76 of the lower flow space 25 is formed. Is provided with an outflow pipe 27, and the buffer gas passing through the upper element is guided to the inner flow path of the lower element through the flow path 74, passes through the element 5 in the radial direction, and is filtered again. After being cleaned, it is discharged from the element outside flow path 76 through the outflow pipe 27.
In the present invention in which two elements are arranged in series in the vertical direction as described above, the drain captured by the upper element is guided to the lower part through the flow passage 74 by the flow of the gas, and the drain liquid passes through the lower element when passing through the lower element. By taking small drain droplets, the amount of drain that cannot be captured by the lower element is reduced. As a result, the amount of the drain liquid itself to be removed also increases, so that stagnation and entrainment of the drain are prevented.
[0028]
A cylindrical flow restricting member 4 having a concave portion 40 that forms a flow space with the inner wall of the main body on the outer surface side is covered by a portion facing the inner surface opening 79a of the outflow pipe 27 on the inner surface side of the container main body 21. At a position different from the inner surface opening 79a of the flow restricting member 4, a porous portion 41 for introducing a buffer gas into the flow space from the element outer flow path 76 is formed. Since the introduced buffer gas is discharged from the outflow pipe 27 after being once circulated in the axial direction along the inner surface of the container, a slight mist that has passed through the element by the flow restricting member forming the detour flow path, Drain is prevented from directly entering the outflow pipe 27 as much as possible, and even if the element is damaged, the debris is prevented from entering the outflow pipe 27.
[0029]
A drain pipe 28 having a drain outlet 90 is provided at the bottom of the main body container 21. In this example, a drain pot 9 with a liquid level meter LG is connected as shown in FIG. Drain is continuously discharged. As shown in FIG. 4, a discharging means for discharging a small amount of gas from a drain pot to an exhaust pipe such as a flare through a throttle section 91 and discharging a part of the buffer gas passing through the element through the drain discharge port 90. The drain attached to the inner surface of the container is forcibly guided to the outlet by the flow of the small amount of the buffer gas discharged, and the drain remains in the inside and enters the outflow pipe 27. Thus, the liquid can be reliably guided to the drain pot.
[0030]
The conduit 108 on the downstream side of the filter device 1 is heated by steam lines, and is subjected to steam trace heat retention for evaporating a liquid component, thereby radiating heat from the piping surface and controlling the flow rate at an orifice, a regulating valve and the like. Mist formation and drainage due to a temperature drop due to the adiabatic expansion action are prevented, and it is preferable that the outflow pipe 27 of the filter device 1 is also kept warm.
[0031]
【The invention's effect】
As described above, according to the filter device of the present invention, even in an operating condition in which a large amount of liquid is present in the buffer gas, the conventional use method in which two single-element structure filter devices are connected in series The same or higher cleaning effect can be expected, and the leak gas flow rate can be stabilized, and the installation space in the conventional case where the two units are connected in series and the accompanying significant modification around the device are avoided. Is done.
[0032]
In the cylindrical container, an upper circulation space and a lower circulation space which are communicated with each other via a flow path are provided, and a cylindrical filter element which allows a sealing gas to pass in a radial direction is provided in each of these circulation spaces. Since they are arranged on a straight line, a compact structure can be maintained.
[0033]
Since each filter element is the same type of element, if the gas contains a large amount of particles and the element is clogged and damaged by the captured particles, the second-stage element can function as a backup and operate in the same manner. The gas seal can be reliably protected.
[0034]
The filter element is a cylindrical coalescer type filter element that passes the sealing gas from the radially inner side to the outer side and captures a liquid component in the gas, wherein the inflow port is disposed in the upper circulation space. While communicating with the flow path, the element outer flow path of the upper circulation space is communicated with the inner flow path of the element arranged in the lower circulation space, the outlet is communicated with the element outer flow path of the lower circulation space, and the container bottom is Also, unlike the conventional one connected in series, the drain caught by the upper element is guided to the lower part along the gas flow, so that the drain outlet communicating with the element outside flow path is provided. Drainage can be prevented from being retained or entrained in the space, and the amount of drain removed can be further increased compared to the conventional two-unit connection method. .
[0035]
For the opening on the inner surface side of the container that communicates with the outlet, a concave portion that forms a flow space between the inner wall of the main body and the outer surface side is provided, and at a height different from the opening of the flow restricting member, A substantially cylindrical flow regulating member having a perforated portion for introducing a processing gas from the element outer flow path into the flow space is covered, and the fluid passing through the element flows through the perforated portion. After being led to the space, and once circulated in the axial direction along the inner surface of the container, and then discharged from the outlet, it is possible to prevent a slight mist or drain passing through the element from reaching the outlet as much as possible. Even if the element is damaged, the fragments can be prevented from entering the opening.
[0036]
Discharge means for discharging a part of the clean gas passing through the element through the drain outlet is provided, and the flow of the discharged clean gas guides the drain attached to the inner surface of the container to the outlet. It is possible to prevent the drain adhering to the gas from being led to the outlet by the flow of the gas, and to reliably remove the trapped drain.
[0037]
The container includes a cylindrical container body in which the lower circulation space is formed on the inner surface side and an inlet and an outlet formed in an outer peripheral wall, and a cylindrical lid in which the upper circulation space is formed on the inner surface side. And the lids are fixed to each other by bolts penetrating through the flanges formed at the respective open ends, so that the elements can be easily exchanged, and the upper element is removed as necessary, and the lid For example, by attaching a plate-shaped member instead of the above, the configuration can be easily changed to a compact filter device having a single element structure.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an internal structure of a filter device according to an embodiment of the present invention.
FIG. 2 is a sectional view showing a state where the configuration is changed to a single element structure.
FIG. 3 is an explanatory view showing a drain pot connected to a discharge pipe.
FIG. 4 is an explanatory view showing a discharge means for discharging a part of a buffer gas from a drain discharge port.
FIG. 5 is an explanatory view showing a non-contact mechanical seal and a filter unit.
FIG. 6 is a sectional view showing an example in which two conventional filter devices having a single element structure are connected in series.
[Explanation of symbols]
Reference Signs List A Filter part B Non-contact mechanical seal 1 Filter device 2 Container 3 Support member 4 Flow control member 5 Element 5a End 5b End 7 Flow path 8 Support rod 9 Drain pot 21 Container main body 21a Flange 22 Lid 22a Flange 23 Plate shape Member 24 Flow space 25 Lower flow space 26 Inflow pipe 27 Outflow pipe 28 Drain pipe 30 Concave groove 31 Supporting end 32 Supporting end 33 Step 40 Depression 41 Perforated part 70 Inlet 71 Flow passage 72 Inside flow path 73 Outside Flow path 74 Flow path 75 Inner flow path 76 Outer flow path 79 Outlet 79a Inner opening 81, 82 Screw groove 83 Fastening member 90 Drain discharge port 91 Restrictor 100 Rotating shaft 101 Filter device 102a Le surface 102 mating ring 103a seal face 103 primary ring 105 pushing means 104 seal housing 106 seal portion 107 sealing portion 108 guide pipe 109 guiding pipe 110 guiding pipe 111 intermediate chamber 112 Labyrinth 113 Labyrinth

Claims (7)

ドライガスシールを成す非接触メカニカルシールに供給されるシール用ガスを予め濾過或いは液分除去して清浄化するためのフィルター装置であって、流入口と流出口を備えた容器内に、該流入口から流出口に至る前記シール用ガスの流路を形成するとともに、前記流路を上流側と下流側に区分するフィルターエレメントを当該流路に沿って直列に複数配置してなり、前記シール用ガスを各エレメントで順次清浄化することを特徴とするシール用ガスのフィルター装置。A filter device for preliminarily filtering or removing a sealing gas supplied to a non-contact mechanical seal forming a dry gas seal and for purifying the gas, and the filter is provided in a container having an inlet and an outlet. While forming a flow path of the sealing gas from an inlet to an outlet, a plurality of filter elements for dividing the flow path into an upstream side and a downstream side are arranged in series along the flow path. A gas filter device for sealing, wherein gas is sequentially purified by each element. 円筒状の前記容器内に、流路を介して互いに連通した上部流通空間及び下部流通空間を設けるとともに、これら各流通空間に、それぞれシール用ガスを径方向に通過させる円筒状のフィルターエレメントを同一直線上に配置してなる請求項1記載のフィルター装置。In the cylindrical container, an upper circulation space and a lower circulation space which are communicated with each other via a flow path are provided, and a cylindrical filter element which allows a sealing gas to pass in a radial direction is provided in each of these circulation spaces. The filter device according to claim 1, wherein the filter device is arranged on a straight line. 前記各フィルターエレメントが互いに同種のエレメントである請求項1又は2記載のフィルター装置。3. The filter device according to claim 1, wherein each of the filter elements is of the same type. 前記フィルターエレメントが、径方向内側から外側に向けてシール用ガスを通過させ、ガス中の液体分を捕捉する円筒状のコアレッサー型フィルターエレメントであり、前記流入口を上部流通空間に配置したエレメント内側流路に連通させるとともに、当該上部流通空間のエレメント外側流路を下部流通空間に配置したエレメントの内側流路に連通させ、前記流出口を下部流通空間のエレメント外側流路に連通させ、容器底部に同じくエレメント外側流路に連通するドレン排出口を設けてなる請求項2又は3記載のフィルター装置。The filter element is a cylindrical coalescer type filter element that passes a sealing gas from a radially inner side to an outer side and captures a liquid component in the gas, wherein the inflow port is disposed in an upper circulation space. While communicating with the inner flow path, the element outer flow path of the upper circulation space is communicated with the inner flow path of the element arranged in the lower circulation space, and the outlet is communicated with the element outer flow path of the lower circulation space, 4. The filter device according to claim 2, wherein a drain outlet communicating with the element outside flow path is provided at the bottom. 前記流出口に通じる容器内面側の開口部に対して、本体内壁との間に流通空間を形成する凹部を外面側に備え、且つ、該流通規制部材の前記開口部と異なる高さ位置に、エレメント外側流路より前記流通空間へ処理ガスを導入するための多孔部を穿設した略筒状の流通規制部材を覆設してなり、前記エレメントを通過した流体を前記多孔部を介して流通空間に導き、容器内面に沿って一旦軸方向に流通させた後、前記流出口より排出してなる請求項4記載のフィルター装置。For the opening on the inner surface side of the container that communicates with the outlet, a concave portion that forms a flow space between the inner wall of the container and the outer surface side is provided, and at a different height from the opening of the flow restricting member, A substantially cylindrical flow regulating member having a perforated portion for introducing a processing gas from the element outer flow path into the flow space is covered, and the fluid passing through the element flows through the perforated portion. The filter device according to claim 4, wherein the filter device is led to a space, once circulated in the axial direction along the inner surface of the container, and then discharged from the outlet. エレメントを通過した清浄ガスの一部を、前記ドレン排出口を通じて排出させる排出手段を設け、当該排出される清浄ガスの流れにより容器内面に付着したドレンを排出口へ導いてなる請求項4記載のフィルター装置。5. A discharge means for discharging a part of the clean gas passing through the element through the drain discharge port, and the drain attached to the inner surface of the container is guided to the discharge port by the flow of the discharged clean gas. Filter device. 前記容器を、前記下部流通空間が内面側に形成され、外周壁に流入口及び流出口が形成された筒状の容器本体と、前記上部流通空間が内面側に形成された同じく筒状の蓋体とより構成し、それぞれの開口端部に形成されたフランジを貫通するボルトによって互いに固定される請求項2〜6の何れか1項に記載のフィルター装置。The container includes a cylindrical container body in which the lower circulation space is formed on the inner surface side and an inlet and an outlet formed in an outer peripheral wall, and a cylindrical lid in which the upper circulation space is formed on the inner surface side. The filter device according to any one of claims 2 to 6, comprising a body and fixed to each other by bolts penetrating flanges formed at the respective open ends.
JP2002242512A 2002-08-22 2002-08-22 Gas filter device for sealing Expired - Fee Related JP4333101B2 (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010102940A1 (en) * 2009-03-10 2010-09-16 Siemens Aktiengesellschaft Shaft seal for a turbomachine
CN102072322A (en) * 2011-01-31 2011-05-25 江苏金鹰流体机械有限公司 Combined type sealing device with double end faces
EP2326858A1 (en) * 2008-09-25 2011-06-01 Siemens Aktiengesellschaft Arrangement comprising a shaft seal
JP2012531305A (en) * 2009-07-02 2012-12-10 オーリコン レイボルド バキューム ゲーエムベーハー Multistage oil separator
JP5945793B1 (en) * 2016-02-16 2016-07-05 株式会社フクハラ Filter device for compressed air
JP2016161099A (en) * 2015-03-04 2016-09-05 三菱化学株式会社 Transfer method for liquid containing easy-polymerizable compound

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2326858A1 (en) * 2008-09-25 2011-06-01 Siemens Aktiengesellschaft Arrangement comprising a shaft seal
EP2326857A1 (en) * 2008-09-25 2011-06-01 Siemens Aktiengesellschaft Arrangement comprising a shaft seal
WO2010102940A1 (en) * 2009-03-10 2010-09-16 Siemens Aktiengesellschaft Shaft seal for a turbomachine
CN102348915A (en) * 2009-03-10 2012-02-08 西门子公司 Shaft seal for a turbomachine
US8985587B2 (en) 2009-03-10 2015-03-24 Siemens Aktiengesellschaft Shaft seal for a turbomachine
JP2012531305A (en) * 2009-07-02 2012-12-10 オーリコン レイボルド バキューム ゲーエムベーハー Multistage oil separator
CN102072322A (en) * 2011-01-31 2011-05-25 江苏金鹰流体机械有限公司 Combined type sealing device with double end faces
JP2016161099A (en) * 2015-03-04 2016-09-05 三菱化学株式会社 Transfer method for liquid containing easy-polymerizable compound
JP5945793B1 (en) * 2016-02-16 2016-07-05 株式会社フクハラ Filter device for compressed air
JP2017144365A (en) * 2016-02-16 2017-08-24 株式会社フクハラ Filter device for compressed air

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