A direct buried heat preservation and anticorrosion expansion joint

Abstract

The invention relates to a direct burial type heat-preservation antiseptic expansion joint which comprises an end tube, a siphunculus, a working bellows, an antiseptic bellows, a pressure-bearing shielding can, a first protective cover, a second protective cover and a guide shielding can, wherein the working bellows is sleeved on the left side of the siphunculus, the two ends of the working bellows are respectively fixed on an internal guide plate and a middle end plate by virtue of working adapters, and the internal guide plate is fixed on the left end of the siphunculus; the pressure-bearing shielding can is sleeved outside the working bellows, the left end of the pressure-bearing shielding can is fixedly connected with the end tube, and the middle of the pressure-bearing shielding is fixedly connected with the middle end plate; the first protective cover is sleeved outside the pressure-bearing shielding can, the left end of the first protective cover is fixedly connected with the end tube, and the right end of the first protective cover is fixedly connected with the pressure-bearing shielding can; the guide shielding can is sleeved on the right side of the outer siphunculus, the left end of the guide shielding can is fixedly connected with the siphunculus, and the antiseptic bellows is sleeved outside the guide shielding can; and the second protective cover is sleeved outside the antiseptic bellows, the two ends of the antiseptic bellows are respectively fixedly connected with the right ends of the first protective cover and second protective cover, and the left end of the second protective cover is sleeved on the right end of the first protective cover. The expansion joint provided by the invention has the advantages of good tightness, long service life and high thermal efficiency.

Description

technical field [0001] The invention relates to a pipe network component, in particular to a direct-buried thermal insulation and anti-corrosion expansion joint used in a heating pipe network, and belongs to the technical field of pipes. Background technique [0002] In urban heating pipe network systems, corrugated expansion joints are generally used as thermal compensation devices for heating pipe networks. With the application of direct burial technology of heating pipelines and direct burial corrugated expansion joints, direct burial expansion joint technology has shown many outstanding advantages such as small footprint, low engineering cost, no impact on city appearance, and environmental protection. At present, the commonly used directly buried external pressure bellows expansion joints or direct buried internal pressure bellows expansion joints are in direct contact with groundwater in terms of structural design, which can only prevent the larger solid particles ...

AI Technical Summary

Problems solved by technology

At present, the commonly used directly buried external pressure bellows expansion joints or direct buried internal pressure bellows expansion joints are in direct contact with groundwater in terms of structural design, which can only prevent the larger solid particles in the ground from invading the bellows, and cannot be effective. The corrosion of the corrugated pipe by groundwater and other liquid substances is greatly reduced, which greatly reduces the safety quality and operating life of the corrugated expansion joint, and limits the scope of use of the directly buried corrugated expansion joint, especially in areas with high surface water levels and coastal cities. use

In addition, due to the lack of insulation facilities for corrugated pipes, the thermal efficiency of directly buried heating pipes is reduced

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