Patent ID: 6863123

Claim:
A high thermal change rate temperature test device which is provided with a cabinet body with each peripheral side made from heat insulating cabinet walls, and a bottom portion matching a baseplate of different test forms, the baseplate being made from a light and easy to assemble material of low heat conductivity comprising bakelite; bottom portions of four side walls of the cabinet body having soft thermal insulating sponges attached thereto so that when covering the bakelite baseplate, the weight of the cabinet body itself can press the thermal insulating sponges to form internal and external heat insulation for the cabinet body; an upper end of the cabinet body being provided with a plurality of circulation fans; an upper end of the interior of the cabinet body being provided with high speed electric heating tubes, inner wall surfaces of the upper end of the interior of the cabinet body being provided with a plurality of nozzles connected to liquid nitrogen pipes, the liquid nitrogen pipes being provided with pressure adjusting valves, pressure meters, cryogenic valves, the pressure adjusting valves and the cryogenic valves being connected by flexible stainless steel hose, outlet ends of the cryogenic valves for controlling liquid nitrogen being connected to the nozzles in the cabinet, the cryogenic valves and nozzle sets being connected by short pipes to prevent delay in low temperature control; the liquid nitrogen pipes being designed to be multiple in number, each being connected to a Dewars liquid nitrogen bottle, the cryogenic valves of all pipes being simultaneously opened during full-speed temperature cooling to eject liquid nitrogen, the cryogenic valve of only one group of the liquid nitrogen pipes being used at a constant temperature, and a minority of the nozzles being subjected to temperature micro-adjustment, achieving a satisfactory temperature controlling effect of quick temperature cooling and quick stability of temperature when temperature is constant.