Novel corrosion-resisting expansion appliance for pipelines

Abstract

The invention discloses a novel corrosion-resisting expansion appliance for pipelines, belonging to the technical field of a compensation device structure of a heat pipe. The novel corrosion-resisting expansion appliance for the pipelines comprises an inner pipe, an altered-diameter core pipe, a corrugated pipe, an outer sleeve pipe, a convex outer ring for the altered-diameter core pipe, an inner bearing platform for the outer sleeve pipe, a sealing piece and the like, wherein the inner pipe smoothly and entirely passes into the convex outer ring for the altered-diameter core pipe and matched with the inner wall of the altered-diameter core pipe in a lap joint manner to seal a notch of the convex outer ring for the altered-diameter core pipe; the altered-diameter core pipe and the convex outer ring for the altered-diameter core pipe with the sealing piece can entirely displace along the axial direction of the altered-diameter core pipe and a displacement structure in a space between the outer sleeve pipe and the inner pipe along with the expansion of the corrugated pipe, wherein the displacement structure displaces relative to the inner pipe; and the inner bearing platform for the outer sleeve pipe is abutted against the outer end of the step-shaped wide opening of the convex outer ring for the altered-diameter core pipe, and therefore, an anti-release limiting structure of the altered-diameter core pipe is formed. The novel corrosion-resisting expansion appliance for the pipelines has the characteristics of small internal pressure thrust and friction, stable sealing property, small heat waste, corrosion resistance, no direction limitation and large absorption displacement.

Description

technical field [0001] The invention relates to a novel corrosion-resistant expander for pipelines, which belongs to the technical field of pipeline compensation devices for thermal networks, and specifically belongs to the technical field of compensation device structures for thermal pipelines used in industries such as petroleum, chemical industry, light industry, thermal power, and metallurgy. Background technique [0002] Due to the temperature change of the transmission medium, the thermal pipeline will inevitably cause thermal expansion and contraction of the pipeline, and the expansion and contraction deformation of the pipeline will appear in the form of axial thrust or axial displacement that is not conducive to the safe operation of the pipeline. Under normal circumstances, pipeline compensation devices are installed in thermal pipelines to absorb or compensate pipeline deformation. The following types of compensators are common in the market: 1. Spherical compensa...

AI Technical Summary

Problems solved by technology

Among them: the application range of the spherical compensator is limited, and the pressure loss is large; the corrugated compensator has a large pipeline stress in practical application, and it is always in a stressed state during operation, which is easy to burst; the old-fashioned sleeve compensator has a single structure and is sealed. The performance is unstable, the leakage phenomenon is common, and the anti-corrosion link is also very weak

The performance of the rotary compensator is good; it has a large amount of compensation and flexible layout, especially in long-distance overhead pipelines. However, there are also shortcomings: first, the gap between the inner pipe and the reducing pipe is too large, During the movement of the fluid medium, eddy currents will be generated in this part, which will increase the pressure loss of the fluid medium

Second, because the structure of the rotary compensator is a radial working principle, it must occupy a certain space when it is arranged in the pipeline; each set of compensator installation points must be equipped with a drain valve; this increases the cost and pressure loss of the pipeline network; especially It cannot be widely used in buried pipelines

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