Hot plate with shaped double walled electric heating element to promote heat transfer

摘要

A ordinary electric heating-tube is sleeved with an aluminum tube to form a double-walled structure in which the aluminum tube is pressure reformed to a shape of upper flat and lower circular surface. A lower tray is made of steel and pressed with recessed grooves. The double-walled electric heating-tube is disposed in the grooves of the tray and covered with an aluminum evenly-heating-plate. The evenly-heating-plate, the electric heating tube, and the lower tray is pressed to form an integral body. The outer wall of the electric heating-tube has a large contacting area with the evenly-heating-plate.