Patent ID: 9587884
Date: 2017-03-07
CPC Classifications: F27B,F27D

Claim:
1. A heat insulation structure, which has a cylindrical side wall part formed in a multilayer structure, the heat insulation structure comprising: a cooling gas supply port provided in an upper portion of a side wall outer layer disposed in an outer side of the side wall part; a cooling gas passage provided between a side wall inner layer disposed in an inner side of the side wall part and the side wall outer layer; a space provided in an inner side of the side wall inner layer; a plurality of blowout holes provided in the side wall inner layer for distributing cooling gas from the cooling gas passage to the space; a buffer area continuously provided in the cooling gas supply port and the cooling gas passage; and a throttle part configured to reduce a cross-sectional area of a boundary surface between the buffer area and the cooling gas passage.