Bottom thermal protecting and thermal sealing structure for tail section of guided missile

The invention provides a bottom thermal protecting and thermal sealing structure for a tail section of a guided missile. The structure comprises an annular laminated high silica/ phenolic aldehyde heatproof plate, a metal-based flexible graphite seal ring and an annular metal bottom plate; the inner section of the annular metal bottom plate is step-like; the annular metal bottom plate is fixedly connected to the annular laminated high silica/ phenolic aldehyde heatproof plate to form an annular groove inside; the metal-based flexible graphite seal ring is spliced by an annular plane and an annular wall surface, wherein the annular section thereof is in a shape of a formula, the annular plane of the metal-based flexible graphite seal ring is embedded into the annular groove, the annular wall surface, vertical to the annular plane, of the metal-based flexible graphite seal ring extends toward the annular metal bottom plate, the annular metal bottom plate is fixedly mounted on a bottom metal shell of the tail se