Metal PTC electric heating tube component of air conditioner and manufacturing method thereof

Abstract

The invention discloses a metal PTC electric heating tube component of an air conditioner. A wound PTC heating filament of which two ends are sleeved and fixed with a conductive bar respectively, is placed in the center of a copper-plated iron pipe; a part of the conductive bars at two ends of the wound PTC heating filament is positioned outside the copper-plated iron pipe; magnesium oxide powderas heat conducting and insulating powder is filled in the copper-plated iron pipe; the wound PTC heating filament is tightly pressed in the center of the magnesium oxide powder in the copper-plated iron pipe; an aluminum pipe of a plurality of aluminum radiating fins is sleeved outside an expansion sleeve of the copper-plated iron pipe, namely the copper-plated iron pipe is tightly matched with the aluminum pipe, and the aluminum pipe is tightly matched with the aluminum radiating fins; and pipe orifices at two ends of the copper-plated iron pipe are sealed by silicon rubber and then sleeved into a porcelain head. The metal PTC electric heating tube component has the advantages of reasonable structure and better safety performance and durability. A manufacturing method for the component comprises the following steps: cutting the pipe, grinding the pipe, drilling the pipe, cleaning, winding wires, cleaning, drying, threading, measuring wires, spot welding, filling, stuffing a film, measuring withstood voltage, contracting the pipe, detecting the length of the pipe, middle inspection, peeling, pulling out colloidal particles, cutting a pin, straightening, inversing pipe angles, expanding the pipe, sealing, measuring the withstood voltage, measuring insulation, and measuring resistance.

Description

technical field [0001] The invention relates to an air conditioner metal PTC electric heating tube assembly and a manufacturing method thereof. Background technique [0002] The vast majority of air conditioners are bidirectional, that is, they can both cool and heat. However, due to the limitation of the heating cycle itself, the working efficiency of heating is not as high as that of cooling, especially in cold regions. Therefore, an auxiliary electric heater is often required. At present, most of the auxiliary electric heaters for air conditioners are nickel-chromium wires or non-insulated PTC (the so-called PTC is the abbreviation of Positive Temperature Coefficient, which means positive temperature coefficient of resistance, and the resistance value increases with the rise) electric heating tubes. Nickel-chromium wire electric heating tubes are difficult to match the service life of air conditioners due to their poor reliability and short product life; non-insulated PT...

AI Technical Summary

Problems solved by technology

Its heating element is a metal PTC tube, and the inner cavity of the metal PTC tube is filled with thermally conductive insulating powder, and the cavity between the metal PTC tube and the heat dissipation tube is evenly filled with thermally conductive insulating powder, and the structure is not very reasonable.

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