| 摘要 |
PURPOSE: To prevent mutual contact of plurality of tubes in high temperature by installing an insulating board consisting of ceramics material between the face in the high temperature space side of a high temperature space side tube board and the face in the low temperature side of a low temperature space side tube board. CONSTITUTION: An upper tube board heat insulating board 9 consisting of ceramics is provided on the upper side of the upper tube board 1 and heat of the tube board 1 is prevented from radiating on a fuel supply chamber 3 side by action of the board 9. Therefore, as temperature difference between a lower tube board 2 and the tube board 1 decreases, consequential heat extension difference and deflection quantity difference decreases, and at the same a fuel injection tube 7, which is held by the tube board 1, and a cell tube 8, which is held by the tube board 2 and concentric with the tube 7 in ordinary temperature, are prevents from contacting with each other in high temperature. Namely, mutual contact and damage of concentric multiple tubes can be prevented. |
