Uniform temperature testing of vacuum furnaces
The design of the cooling nozzle has been patented with a flap that can be flipped to prevent cold air from entering the hot zone during convection heating. An arc-shaped graphite heating element was used in the cylindrical section of the hot zone to provide additional charging space. This curved shape of the graphite heating element reduces the number of connectors by 50% compared to the original polygonal heating element.
Temperature uniformity test. The heating element of the GV6060 hot zone has five adjustable sections. Including the heating elements on both sides of the hot zone and the 3 circular belts on the cylinder, they are arranged in the upper, middle, and lower positions, respectively. Please see. A test fixture with 9 K-type thermocouples was used in the temperature uniformity test. Four thermocouples were placed on top, four on the bottom and one in the middle. Reference bracket.
Three temperature tests were performed using radiant heating, 538e, 816e, and 1093e. Two temperature point tests were performed using convection heating, 538e and 816e. Convective heating temperature uniformity was performed with the cooling nozzle closed and kept open Test to verify the role of the cover plate. In the entire temperature uniformity test, the five heating segments were adjusted at 538 e to achieve the best uniformity, and the same adjustment was used in other temperature tests. The heating section that needs to be adjusted at 538e only depends on whether radiant heating or convection heating is used.
The suggestion for further improving the temperature uniformity is to use an independently controlled heating zone in the furnace. This will allow each heating section to be independently adjusted at each temperature set point. The uniformity test of opening and closing of the nozzle cover shows that the temperature uniformity is not ideal when there is no cover plate blocking effect. The temperature difference rises approximately twice as the cover is opened. This test proves the advantages of this patented nozzle.
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