A high temperature resistant antifreeze mpp pipe

Abstract

The invention relates to a high-temperature-resistant anti-freezing MPP pipe which comprises a pipe body. A flow guide channel penetrating through the pipe wall is formed in the pipe body, and a flowguide pipe is arranged in the flow guide channel. A heat dissipation cavity is formed in the outer wall of the pipe body, a heat absorption cavity is formed in the inner wall of the pipe body, the heat dissipation cavity and the heat absorption cavity are communicated through the flow guide pipe to form a closed loop, and the closed loop is filled with cooling liquid. An elastic separation piece is arranged in the heat absorption cavity and divides the heat absorption cavity into two subareas, and each subarea is communicated with the heat dissipation cavity through the flow guide pipe. The elastic separation piece is made of two-way memory alloy, and the volumes of the two subareas are repeatedly changed when the temperature is changed; a one-way flow guide switch is also arranged on theelastic separation sheet; and through the unique structural design, the heat transfer efficiency of the MPP pipe is improved, and the high-temperature resistance, cold resistance and frost resistanceof the MPP pipe are effectively enhanced.

Description

technical field [0001] The invention relates to the field of cable assemblies, in particular to a cable protection tube. Background technique [0002] Memory metal refers to a special metal material that can recover its original macroscopic shape in another temperature range after plastic deformation occurs in a certain temperature range; its microstructure has two relatively stable states, and this alloy can be used at high temperatures. into any shape you want, the alloy can be stretched at lower temperatures, but if you reheat it, it will remember its original shape and change back; for example, a spiral superalloy, After high-temperature annealing, its shape is in a helical state. At room temperature, even if it is forcibly straightened with a lot of effort, as long as it is heated to a certain "transformation temperature", the alloy will immediately return to its original spiral shape as if it remembered something. [0003] It is mainly a nickel-titanium alloy materia...

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Problems solved by technology

[0004] MPP pipe, also known as MPP power cable protection pipe, is divided into excavation type and non-excavation type. MPP non-excavation pipe is also called MPP jacking pipe or supporting pipe; compared with the traditional "grooving and buried pipe method", The non-excavation power pipe project is more suitable for the current environmental protection requirements, and removes the dust, traffic congestion and other disturbing factors caused by traditional construction. This technology can also lay pipelines in some areas where excavation operations cannot be implemented, such as historic sites. , downtown areas, crop and farmland protection areas, highways, rivers, etc.; MPP pipes use modified polypropylene as the main raw material, and their tensile and compressive properties are higher than HDPE. MPP pipes are light, smooth, small in friction resistance, and heat-resistant Fusion welding butt joint; it has the characteristics of high temperature resistance and external pressure resistance; the long-term use temperature is in the range of -20 ~ 70 ℃, and it has excellent electrical insulation; but in the actual working process of the cable, a large amount of heat energy is easy to accumulate in the pipeline, causing The internal temperature of the pipe body continues to rise, which brings great safety hazards to the normal operation of the cable; in addition, in extreme weather or special construction sites, the ambient temperature outside the cable is so low that it exceeds the normal working range of the traditional pipe body. There are problems of cracking and damage in the body; it is difficult and costly to improve the protection tube only from the improvement of materials, so the high temperature resistance, cold resistance and frost resistance of the tube body can be enhanced from other angles

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