| 摘要 |
PURPOSE:To suppress the generation of creep and thereby lengthen a life, by threadedly engaging a core into a joint body, and embedding a low-melting point alloy in a gap between the joint body and the core. CONSTITUTION:A core 5 is formed in a transverse cross sectional shape dividing a cross section of a low-melting point alloy 2 in a pressure receiving direction into a plurality of sections. The low-melting point alloy 2 is embedded in a gap between the core 5 and a joint body 1. As a contact area between the joint body 1 and the low-melting point alloy 2 and between the core 5 and the alloy 2 is large, and a pressure receiving area per section as divided is small, a displacement in a pressure receiving direction due to the expansion of the low-melting point alloy 2 is small. Accordingly, even when a normal pressure is received at temperatures lower than a predetermined temperature for a long time, creep is hardly generated, and a life of a fusible plug may be lengthened.
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