Buried thermal insulation fixed knot

Abstract

The invention discloses a buried thermal insulation fixed knot. The fixed knot is characterized by comprising a core pipe, a thermal insulation layer, a high-efficiency hard thermal insulation layer and an outer pipe, wherein the high-efficiency hard thermal insulation layer is arranged between the core pipe and the outer pipe, and is connected with the core pipe and the outer pipe through welding points; and the thermal insulation layer is filled between the core pipe and the outer pipe. The buried thermal insulation fixed knot adopts a direct welding structure of the high-efficiency hard thermal insulation layer and the core pipe and the outer pipe, so that the bearing pressure of the fixed knot is greatly enhanced, and a fixed effect is achieved; the high-efficiency hard thermal insulation layer stops the heat transfer between the core pipe and the outer pipe, so that the heat of the core pipe cannot be transferred or is little transferred; and the buried thermal insulation fixed knot is simple in structure, high in bearing pressure, strong in adaptability, stable in transmission performance, low in heat conducting coefficient, obvious in thermal insulation effect and prominent in energy saving effect.

Description

technical field [0001] The invention relates to the field of fixed joints for buried pipes, in particular to a heat-insulating fixed joint for buried pipes with stable transmission performance and low thermal conductivity. Background technique [0002] At present, the production method of the fixed joint on the market is to weld two sections of outer protective tubes through flanges to form a relatively fixed whole. The working tube passes through the middle of the connected outer protective tubes, and the middle of the working tube and the outer protective tubes For the anti-corrosion process, the thickness of the flange is 15-40mm. The thickness of the flange can also be selected according to the diameter of the pipe and the pressure of the pipe. The part of the flange protruding from the outer protective pipe should be selected to reserve a certain length. In order to fit with the cement pier and keep fixed with the cement pier, the purpose is to prevent the axial displac...

AI Technical Summary

Problems solved by technology

However, since the welded fixed joint is in contact with the cement pier and soil, the fixed joint becomes a heat dissipation point in the pipeline, which increases the heat loss and pressure drop of the pipeline and reduces the thermal efficiency of the pipe network

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