A pipeline expansion joint with its own secondary pressure charging

An expansion joint with its own technology, applied in the field of expansion joints, can solve problems such as large internal and external pressure difference, pipeline medium leakage, short fatigue life, etc., achieve the effect of reducing the working stress state, increasing the use pressure occasion, and meeting the temperature compensation requirements

Active Publication Date: 2018-04-24
LUOYANG SUNRUI SPECIAL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compensator selected for the existing pipeline only bears internal pressure or external pressure, the internal and external pressure difference is large, the bellows is in a state of high stress, and the fatigue life is short
At the same time, due to the lack of an alarm device, it is not easy to find out in time after the bellows breaks, resulting in the leakage of the pipeline medium, resulting in property loss and safety accidents.

Method used

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  • A pipeline expansion joint with its own secondary pressure charging
  • A pipeline expansion joint with its own secondary pressure charging
  • A pipeline expansion joint with its own secondary pressure charging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Such as figure 1 and figure 2 The pipeline expansion joint with self-contained secondary pressure shown in the figure is an external pressure type, and the waveform parameters and wave numbers of the working bellows 4 and the protection bellows 9 are the same. The inlet pipe assembly 1, the outer pipe 2, the middle pipe assembly 8, the working bellows 4, the inner end ring assembly 3, and the outlet pipe 11 form a fluid medium space, and the working bellows bear the high external pressure of the working fluid medium. The protection bellows 9 is welded with the outer end ring assembly 10 to form a secondary pressurization chamber, the working bellows bears the internal pressure set by the pressurization medium, and the protection bellows also bears the internal pressure of the pressurization medium. In this way, the pressure difference between the inner and outer surfaces of the working bellows will be reduced, and the stress situation will be greatly improved, which i...

Embodiment 2

[0026] Such as image 3 and Figure 4 As shown, the pipeline expansion joint adopts the internal pressure type, the inlet pipe assembly 1, the working bellows 4, and the outlet pipe 11 form a fluid medium space, and the working bellows bears the high internal pressure of the working fluid medium. The protection bellows 9 is welded with the outer pipe 2 to form a secondary pressurization chamber, the working bellows bears the external pressure set by the pressurization medium, and the protection bellows bears the internal pressure of the pressurization medium. In this way, the pressure difference between the inner and outer surfaces of the working bellows will be reduced, and the stress situation will be greatly improved, which is beneficial to improving the service life of the working bellows.

[0027] The pressurized medium 19 is gas, which is filled by the external pressurized gas cylinder 17 through the pressurized valve 16 and the plugging pipe 15 . The pressure chamber ...

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Abstract

The invention relates to an expansion joint for a pipeline with self-contained secondary pressure, which includes a working bellows for compensating the expansion and contraction of the pipeline. Internal pressure, or set inside the pipeline to withstand the external pressure exerted by the fluid medium in the pipeline on its outer wall; the outside or inside of the working bellows is provided with a pressurized medium for applying an opposite pressure to the fluid medium on the working bellows. The pressure medium is connected to a protective bellows. The pipeline expansion joint with a secondary pressure charging alarm structure of the present invention can not only reduce the working stress state of the bellows, meet the temperature compensation requirements of the pipeline, improve the service life of the bellows, and meet the requirements of safe use.

Description

technical field [0001] The invention relates to an expansion joint, in particular to an expansion joint for a pipeline with its own secondary pressure charging. Background technique [0002] With the advancement of urbanization and industrialization in my country, centralized heating projects and petrochemical projects are being constructed on a large scale, and there are temperature changes in the pipelines that transport fluid media. The pipelines need to be designed with compensator expansion joints to compensate for the thermal expansion and contraction of the pipelines, so as to reduce the temperature of the pipelines. Stress, to ensure the safe operation of the pipeline system. The compensator selected for the existing pipeline only bears internal pressure or external pressure, the internal and external pressure difference is relatively large, the bellows is in a state of high stress, and the fatigue life is short. At the same time, due to the lack of an alarm device, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16L51/03
CPCF16L51/03
Inventor 郑大远李凯李世乾王伟兵张爱琴杨萌
Owner LUOYANG SUNRUI SPECIAL EQUIP
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