Electric heating temperature preserver for low-pressure casting

The utility model provides an electric heating temperature preserver for casting in low pressure, which comprises a liquid-lifting tube, a support seat, a heating jacket, a resistance wire, a temperature preserving cover and a hollow chamber, wherein the support seat is arranged on the lower part of the liquid-lifting tube, the heating jacket is arranged on the periphery of the upper part of the support seat, the resistance wire is arranged on the heating jacket, the temperature preserving cover is arranged on the periphery of the heating jacket, and the hollow chamber is arranged between the liquid-lifting tube and the heating jacket. The utility model alters the structure that the support seat needs to be lengthened to the upper part of the liquid-lifting tube in a common technique in order to form the hollow chamber which is arranged between the liquid-lifting tube and the heating jacket, and the utility model has the advantage of enhanced heating speed; because the utility model can be heated to the temperature of from 500 DEG C. to 600 DEG C. in about 3 hours, energy consumption is reduced; because a blockage phenomenon can not appear on the upper part of the liquid-lifting tube, the utility model has the advantage of continuous production; the resistance wire can be replaced separately after damaged, therefore work is not influenced, and production efficiency is increased substantially; molten aluminium is not leaked in order to avoid industrial accidents; the utility model can ensure solidification to succeed, therefore the phenomena, such as shrinkage cavity of castings, loosening of the castings, etc. can be overcome.