High-temperature dry block temperature calibrator

A high-temperature dry block temperature calibrator, used for temperature calibration of a high temperature element under test, comprising:

• a high-temperature furnace body and a control board module, which are independently assembled on an instrument lower support and located in a cover body of an instrument outer cover assembled above the instrument lower support and engaged at a periphery;
• a system board module assembled on a side surface of the instrument outer cover;
• and
• a protective apparatus arranged at the top of the instrument outer cover, wherein a top protective plate of the protective apparatus is provided with a hole corresponding to a furnace opening of the high-temperature furnace body and a jack at the top of the instrument outer cover in order to receive the element under test, and the side surfaces of the protective apparatus are open or are ribbed plates with air outlets,
• wherein the high-temperature furnace body comprises:
• a base arranged at the bottom of the high-temperature furnace body;
• a thermostatic block and a heat-insulating cylinder which are fixed on the base, wherein the heat-insulating cylinder is disposed on the outer periphery of the thermostatic block with a certain spacing from the thermostatic block to form a cooling channel;
• and
• a cooling fan mounted in a cavity of the base;
• the base is provided with ventilation holes in communication with the cooling channel, and the cooling fan is in communication with the cooling channel through the ventilation holes, and
• wherein the heat-insulating cylinder comprises an inner cylinder and an outer cylinder sleeved outside the inner cylinder, and the inner cylinder is a sealed double-layer structure, which is a hollow heat insulation cylinder consisting of an inner wall, an outer wall and closure plates at the two ends;
• the inner cylinder is arranged outside the thermostatic block with a certain spacing from the thermostatic block to form the cooling channel, the outer cylinder is arranged around the inner cylinder and a spacing therebetween forms a secondary cooling channel, and the bottom of the inner cylinder and the bottom of the outer cylinder are fixed on the base of the high-temperature furnace body;
• the top of the inner cylinder and the top of the outer cylinder are engaged by means of a positioning block, which is provided with an airflow outlet in communication with the cooling channel and the secondary cooling channel.