| 摘要 |
The present invention relates to a passive shutdown sealing device (20, 40) for a primary motorized pump unit comprising a series of thermal bimetal strips (21, 41) having a first position, known as the cold position, when the temperature of said bimetal strips is below said temperature threshold, and a second position, known as the hot position, when the temperature of said bimetal strips is above said temperature threshold; a sealing ring (23) having an activated position when said thermal bimetal strips (21, 41) are in their hot position and having an inactivated position when said thermal bimetal strips are in their cold position; locking/unlocking means (25) designed to lock said sealing ring (23) in its inactivated position when said thermal bimetal strips (21, 41) are in their cold position and to free said sealing ring (23) when said thermal bimetal strips (21, 41) are in their hot position; elastic means (24) designed to urge said sealing ring (23) into the activated position when said locking/unlocking means (25) are unlocked.
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