Low-temperature high-pressure resistant electric heater and its manufacturing method

Abstract

The invention discloses a low-temperature high-pressure resistant electric heater in the field of electric heating devices and a manufacturing method thereof. The manufacturing method includes the following steps: preparing the corresponding length of an electric heat pipe, a resistance wire, a conductive lead rod and a protecting pipe, placing the protecting tube vertically, and stretching the resistance wire into the protecting tube; vertically placing the electric heating tube, putting the protecting tube into the electric heating tube, filling the magnesium oxide powder into the electric heating tube, keeping the protecting tube in the centering, removing the protecting tube out of the electric heating tube, carrying out pressure withstand test on the electric heating tube, reducing the diameter of the electric heating tube and sizing the axial length; the outer periphery of the electric heating tube is wound and provided with a heat radiating fin bending processing and forming; the tube mouth of the electric heating tube is sealed by silica gel, and an insulating terminal and a conductive rod fastener are arranged at the sealing end of the electric heating tube. The electric heater is processed by the method. According to the invention, the side of the wall of the electric heating tube can be prevented from being broken down under the high-pressure impact, the heat supplyis prevented from being interrupted, and the personal safety hazard is avoided.

Description

technical field [0001] The invention belongs to the field of electric heating devices, in particular to a low-temperature high-voltage resistant electric heater and a manufacturing method thereof. Background technique [0002] An electric heating tube is an electrical component that converts electrical energy into heat energy. In the prior art, there is an electric heating tube, the structure of which includes a metal tube shell, the inside of the metal tube is provided with an electrothermal alloy wire along the central axis, and a conductive rod connected with a resistance wire is provided at the nozzle, and the electrothermal alloy wire is connected to the inside of the metal tube. There is magnesium oxide powder between the walls, and the two ends of the metal tube are sealed with silica gel. When the electric heating tube is working, the conductive rod is connected to the power supply, and the resistance generates heat after being energized. The electric heating tube c...

AI Technical Summary

Problems solved by technology

The disadvantage of the electric heater in the prior art is that the electric heater is applied under the working condition of the 600V voltage of the high-speed train, and it has to withstand the high voltage impact of 3750V. etc., one side of the metal pipe wall is easy to be punctured or flickered; it is difficult to achieve the special requirements of no breakdown and no flicker for 1 minute, and frequent heating interruptions or personal safety hazards

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