Air heater with double protection functions

Abstract

The invention relates to an air heater with the double protection functions. The air heater comprises a rectangular shell, a forceful air circulation device and a power source, wherein the left end and the right end of the rectangular shell are provided with openings. The shell is internally provided with a plurality of PTC heating pieces. An infrared temperature detector is arranged at the bottom of the rectangular shell. A circuit where the power source is located is connected with a temperature controller, a fuse and a normally-closed contact in series. According to the air heater with the double protection function, constant temperature can be achieved automatically, energy can be saved, risks of safety accidents such as explosion and fire disasters can be reduced to a great extent, and the safety of the heater is further improved through the double protection design of the temperature controller and the fuse.

Description

Technical field [0001] The invention relates to the field of electrothermal machinery, in particular to an air heater with double protection. Background technique [0002] Electric heater is one of the important equipment in daily life. Traditionally, stainless steel electric heating tube is generally used. Its structure is to put electric heating wire in the metal tube, and the gap part is tightly filled with thermally conductive and insulating magnesium oxide powder The advantage is that the stainless steel electric heating tube is a pure resistive load, and the power is easy to determine. The disadvantage is that it can only realize on and off control, and cannot automatically adjust the power according to the temperature. At the same time, when the phenomenon of dry burning is caused by an accident, the heating temperature of the stainless steel electric heating tube is easy to be uncontrollable, and the safety hazard is large, and it is easy to cause explosions, fires and ot...

AI Technical Summary

Problems solved by technology

[0002] Electric heaters are one of the important equipment in daily life. Traditionally, stainless steel electric heating tubes are generally used. The structure is to put electric heating wires in the metal tubes, and the gaps are tightly filled with thermally conductive and insulating magnesium oxide powder. The advantage is that the stainless steel electric heating tube is a purely resistive load, and the power is easy to determine. The disadvantage is that it can only be controlled on and off, and the power cannot be automatically adjusted according to the temperature.

At the same time, when dry burning occurs due to accidents, it is easy to cause the heating temperature of the stainless steel electric heating tube to be uncontrollable, causing great safety hazards and easily causing explosions, fires and other injuries.

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