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Oral presentation

Development of a differential pressure switch to be operated correctly, under negative pressure at the Tokai Reprocessing Plant

Yasuo, Kiyoshi; Morimoto, Kenji; Seto, Nobuhiko; Watahiki, Seiichi

no journal, , 

JP, 2009-105389   Patent publication (In Japanese)

Cells and vessels as well as buildings have maintained as a negative pressure to keep nuclear materials inside. Differential pressure switches, detecting change of liquid level and pressure at reprocessing plant, have been required airtightness for the nuclear materials containment under negative pressure. Problem of using the conventional airtight switch is, however, that could not meet the acceptable range with deep negative pressure. We have designed and made a prototype airtight switch applying a new type of pressure detection component. The prototype switch has been reliable on the actual usage, which has been evaluated by an operation, a vibration and an endurance test. We are improving its quality for adapting to the reprocessing process.



安尾 清志; 綿引 誠一

小針 保明*

JP, 2009-105389  Patent licensing information  Patent publication (In Japanese)

【課題】低圧室の雰囲気の圧力の変化に基づく検出誤差の発生を防止することができるベローズ型差圧式圧力スイッチ及び圧力検出システムを実現する。 【解決手段】差圧容器403内を仕切って低圧室401と高圧室402を形成し受圧変位体420の変位に応動するベローズ型差圧式圧力スイッチにおいて、前記受圧変位体は、高圧室から低圧室に向かって伸縮する円筒形状のベローズ421の先端開口を閉じるように該ベローズの先端開口に結合され、前記応動スイッチは、ベローズ先端封止部材422の凹部の周壁に取り付けた永久磁石423と、リードスイッチ425を備え、前記ベローズ先端封止部材の凹部の底壁422Cと前記差圧容器の壁403Aを気密状態に貫通するように螺着された調整ねじ426との間に圧縮状態に介在させたベローズ伸長調整ばね427を設ける。

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