Variable section end head unwarming armored heater and preparation method thereof

Abstract

The invention discloses a variable section end head unwarming armored heater and a preparation method thereof. The heater comprises a metal casing and a resistance heating wire, wherein the resistance heating wire is arranged on the axis of the metal casing; an insulating material is filled between the metal casting and the resistance heating wire; left and right ends of the metal casting are connected with a simple and easy cap respectively; the resistance heating wire passes through the end part of the simple and easy cap to connect a heating traction rod; and an organic seal gum is filled in the simple and easy cap. The heater is characterized in that: two ends of the metal casing are heating ends, the middle part of the metal casing is a middle heating section, and the diameter D of the heating ends is greater than the diameter d of the middle heating section. The preparation method comprises the following steps of: a) drawing; b) rotary swaging; c) end head manufacturing; and d) heating traction rod welding. By designing an armored heating element with a reasonable structure, the heat aggregated at the end head is as low as possible to achieve an effect that the end head is not heated, so a manufacturing process for the end head can be simplified, and the overall performance, particularly the reliability of the heating element can be ensured.

Description

technical field [0001] The invention relates to a heater, in particular to a non-heating armored heater with a variable cross-section end and a preparation method thereof. Background technique [0002] As a heating device, the armored heater is widely used in the fields of modern industry, agriculture and special operations. The armored heater is to put the heating element material with insulation into the metal sleeve, and the three are drawn to make a dense and solid combination. With the rapid development of modern industrial and agricultural production, the requirements for heating device technology are getting higher and higher, especially in harsh environments. It is necessary to ensure not only the functionality of the device, but also its reliability and safety. Traditional armored heaters are limited by their own structure and performance as well as special working conditions and cannot meet production needs. [0003] The terminal of the armored heater is the key ...

AI Technical Summary

Problems solved by technology

The end of the heater is heated during operation, and the sealing material of the end may fail due to carbonization due to excessive temperature during long-term operation (organic adhesive sealing materials such as common rubber seals, etc.), or produce slight damage due to thermal expansion of the material. Cracks (inorganic sealing materials such as glass seals, etc.), which affect the insulation performance of the heater

In addition, the continuous accumulation of heat makes the heating element material form a thicker oxide skin, resulting in poor contact and sparking, and even the heating element material is blown due to the continuous accumulation of heat.

At the same time, for small-diameter heaters with an outer diameter less than φ2.0mm, because the insulation layer between the heating wire and the metal of the armored shell is very thin, but the heating power must be guaranteed, the above conditions are more likely to be broken down and cause heating device failure

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