CATALYTIC THRUSTER

PURPOSE:To secure high performance and long service life of a catalyzer in a cracking chamber by eliminating a clearance in this cracking chamber with a screen mesh with a compression band using a spring. CONSTITUTION:A screen mesh 7 holding a catalyzer 6 keeps off the occurrence of any clearance being produced when the catalyzer 6 is gradually crushed and discharged into space by a heat cycle due to thruster injection, in a way of pressing this catalyzer 6 to the side of an injector 5 with the screen mesh 7 with a compression band 9 using a spring 10. This operation is made possible by pulling one side of the compression band 9 unified with the screen mesh 7 by dint of the spring 10, and locking the other side to an inner wall of a cracking chamber 4. As for holding of the thruster axial catalyzer 6, it is performed by a catalytic layer holding wall 11, and as for the holding of the whole catalytic layer, it is performed by a catalytic layer support 12.