| 摘要 |
<p>The invention concerns an internal pressure explosion-proof system by means of which an electric motor or the like is not rendered operative until after gas in an airtight vessel is replaced with certainty by a protective gas. According to the invention, the internal pressure explosion-proof system (1) comprises gas flow amount detecting means (6a, 6b) provided for an exhaust pipe (5a, 5b) for detecting an amount of protective gas exhausted from an airtight vessel (3) in which an electric appliance (M1, .., M6) which may produce a spark or fire is accomodated, and controlling means (7) for enabling operation of the electric appliance (M1, ..., M6) when a flow amount, detected by the gas flow amount detecting means (6a, 6b) when protective gas is fed into the airtight vessel (3), reaches a predetermined level, and besides the internal pressure of the airtight vessel (3) exceeds another predetermined level.</p> |
