Pipe joint of skin-effect electric heating element

Abstract

The invention relates to a pipe joint used for the connecting of a skin-effect electric heating element and a heating pipe; the pipe joint made of iron-based memory alloy material is provided with 'bound and restore' feature, and can generate a certain connected tightening force, and can be used for replacing the pipe joint made of general material; meanwhile, the problems that the pipe joint for connecting two heating pipes in heating pipe connection of long-distance pipeline electric heating pipe construction is submerged in underground water or accidental water seepage can lead the sealing of the welding seam to be unreliable, which can affect the skin-effect heating current channel, the number of the pipe joints at the heating pipe is large, the welding construction which clings to the long-distance pipeline is difficult, the difficulty of underground construction is large, the workers are more, the construction period is long, and the welding technology is low-efficient are solved; meanwhile, the invention has advantages that: the air tightness is reliable, the welding device and the corresponding personnel are not required, and the operating tool is simple.

Description

technical field [0001] The invention relates to a "skin effect electric heating element pipe joint" for connecting a skin effect electric heating element to a heating pipe. Background technique [0002] It is known that the skin effect electric heating element is installed in parallel and closely attached to the surface of the long-distance pipeline along the axial direction to compensate for the heat and maintain the temperature. It is composed of a high-temperature wire and a heating tube. They are multi-strand soft copper cores and soft magnetic base steel pipes. The high-temperature wires are passed through the inner hole of the heating tube. The first end of the heating tube is respectively connected to the phase line and neutral line of the single-phase AC power supply. When the AC current passes through the core of the high-temperature wire and the heating tube is connected to form a series electrical circuit. On the one hand, the AC current passes through the core o...

AI Technical Summary

Problems solved by technology

Due to the large length of the long-distance pipeline project, the number of "pipe joints" on the heating pipe is large, the welding construction on the surface of the long-distance pipeline is difficult, there is a lot of labor, the construction period is long, especially the buried construction is difficult, and the pipe joints are soaked It is difficult to seal the weld seam under groundwater or accidental water ingress to ensure that water enters the inner cavity, affecting the skin heating current channel and causing serious failures to the project

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