JP7292336B2 - 半導体製造設備の排出流体の処理システム及び方法 - Google Patents
半導体製造設備の排出流体の処理システム及び方法 Download PDFInfo
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Description
110 真空ポンプハウジング
112 ガス吸入口
113 フロント空間
114 ガス排出口
115 リア空間
116 隔壁
117 フロント空間連結通路
118 リア空間連結通路
120 回転軸
122 メインローター
124 補助ローター
130 モーター
140 インバーター
150 プラズマ装置
152 第1連結配管
154 第2連結配管
160 バイパス管
161 バイパス管連結ホール(孔)
162 開閉バルブ
170 制御器
180 圧力センサー
190 ガス副産物検出器
200 ドライポンプ
202 出口管
Claims (12)
- 半導体製造設備の排出流体処理システムであって、
真空ポンプハウジングを含み、前記真空ポンプハウジングの一方の側部にガス吸入口が形成され、前記真空ポンプハウジングの他方の側部にドライポンプと連結されるガス排出口が形成され、
更に、前記真空ポンプハウジングの内部空間を、前記ガス吸入口と連通するフロント空間と、前記ガス排出口と連通するリア空間とに区分する隔壁と、
前記真空ポンプハウジングのフロント空間及びリア空間に回転可能に配置された回転軸と、
前記回転軸に装着され、前記フロント空間に配列された複数のメインローターと、
前記回転軸に装着され、前記リア空間に配列された複数の補助ローターと、
前記回転軸に連結されたモーターと、
前記モーターの駆動を制御するインバーターと、
前記フロント空間と第1連結配管を介して連通可能に連結され、前記リア空間と第2連結配管を介して連通可能に連結されたプラズマ装置と、
前記プラズマ装置と前記真空ポンプハウジングのガス吸入口との間に連結されたバイパス管と、
前記バイパス管に装着された開閉バルブと、
前記インバーターによってモーター回転速度を制御し、前記開閉バルブを所定周期で開閉制御する制御器と、を含む排出流体処理システム。 - 前記ガス吸入口を通して流入する洗浄ガスは、
前記メインローターが装着されたフロント空間を経てから前記プラズマ装置でプラズマ放電によって分解された後、一部が、オープン制御された前記開閉バルブ及び前記バイパス管を通して且つ再び前記ガス吸入口を通して前記メインローターが装着されたフロント空間に供給されるか、又は
前記メインローターが配列されたフロント空間を経てから前記プラズマ装置でプラズマ放電によって分解された後、前記開閉バルブがクローズ制御された状態で前記補助ローターが配列されたリア空間に供給された後、前記ドライポンプに排出される、請求項1に記載の排出流体処理システム。 - 前記ガス吸入口に、前記真空ポンプハウジングの圧力を測定して前記制御器に伝送する圧力センサーが装着される、請求項1に記載の排出流体処理システム。
- 前記制御器は、前記圧力センサーの測定信号に基づき、ブースターポンプの吸入圧力を、前記真空ポンプハウジングの内部に洗浄ガスが留まる時間を遅延させるための設定圧力に高めるように調節するために、前記インバーターにモーター回転速度減少調節のための制御信号を印加するように構成される、請求項3に記載の排出流体処理システム。
- 前記真空ポンプハウジングのガス排出口又は前記ドライポンプの出口管の位置に、工程副産物と反応したガスの副産物量を測定して前記制御器に伝送する副産物検出器が装着される、請求項1に記載の排出流体処理システム。
- 前記制御器は、前記副産物検出器の検出の結果、副産物量が臨界値以上であれば前記プラズマ装置の駆動及び前記モーターの回転速度調節を維持させる制御を行い、副産物量が臨界値未満であれば洗浄ガスの供給を中断し、前記プラズマ装置の駆動を停止させるとともに前記モーターの駆動を元の速度に復帰させる制御を行うように構成される、請求項5に記載の排出流体処理システム。
- 前記真空ポンプハウジングに、前記バイパス管との連結のためのバイパス管連結ホールと、前記プラズマ装置にガス循環可能に連結されるフロント空間連結通路及びリア空間連結通路とが形成される、請求項1に記載の排出流体処理システム。
- 前記プラズマ装置内に、前記バイパス管連結ホールと連通するバイパス管が直接形成される、請求項7に記載の排出流体処理システム。
- 半導体製造設備の排出流体処理方法であって、
洗浄ガスを真空ポンプの真空ポンプハウジング内に供給する段階と、
洗浄ガスをメインローターが存在する前記真空ポンプハウジングのフロント空間を経由させた後、プラズマ装置に供給する段階と、
前記プラズマ装置のプラズマ放電によって、洗浄ガスを分解させる段階と、
前記プラズマ装置と前記真空ポンプハウジングのガス吸入口との間に連結されるバイパス管の開閉バルブがオープンした場合、前記プラズマ装置で分解させた洗浄ガスを、前記バイパス管を通して前記フロント空間に流入させて前記フロント空間内の工程副産物と反応させる段階と、
前記開閉バルブがクローズした場合、前記プラズマ装置で分解させた洗浄ガスを前記真空ポンプハウジングのリア空間に流入させて前記リア空間内の工程副産物と反応させる段階と、
工程副産物と反応した洗浄ガスをドライポンプに排出させる段階と、を含む排出流体処理方法。 - 更に、分解させた洗浄ガスを前記フロント空間又は前記リア空間に供給する前に又は供給している間、制御器によって、圧力センサーの測定信号に基づいてモーターの速度を制御して前記真空ポンプの吸入圧力を設定圧力に高めるように調節する段階を含む、請求項9に記載の排出流体処理方法。
- 前記制御器の電流指令によるインバーターの制御によって前記モーターを定格回転速度より低い速度に低下させるように調節することにより、前記真空ポンプの吸入圧力を、前記真空ポンプハウジングの内部に洗浄ガスが留まる時間を遅延させるための設定圧力に高めるように調節する、請求項10に記載の排出流体処理方法。
- 更に、前記ドライポンプの出口管に装着されたガス副産物検出器で工程副産物と反応した洗浄ガスの工程副産物量を測定する段階と、
測定された工程副産物量と臨界値を比較する段階と、
比較の結果、工程副産物量が臨界値以上であれば、未だに前記真空ポンプハウジングの内部が十分に洗浄されていないと判断し、制御器でプラズマ装置の駆動を維持させるとともに前記真空ポンプのモーターの回転速度調節を維持させる制御を行う段階と、
前記工程副産物量が臨界値未満であれば、前記真空ポンプハウジングの内部が所望の水準に洗浄されたと判断し、前記制御器で洗浄ガスの供給を中断させ、前記プラズマ装置の駆動を停止させるとともに前記モーターの駆動を元の速度に復帰させる制御を行う段階と、を含む請求項9に記載の排出流体処理方法。
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