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Flexible connecting device of high-temperature and high-pressure pipeline and using method of flexible connecting device

A connection device and pipeline technology, which is applied to expansion compensation devices, adjustable connections, pipes/pipe joints/pipe fittings for pipelines, etc., can solve the problems of difficult sealing and sealing of non-welded connection pipes, and achieve significant economic benefits and savings. Construction cost, material and space saving effect

Pending Publication Date: 2022-03-18
INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is: in order to solve the problem of temperature difference stress compensation caused by thermal expansion and contraction of high-temperature and high-pressure pipelines and the problem that non-welded connection pipelines with alternating cold and hot working conditions are difficult to be airtight and sealed, the present invention provides a flexible connection device for high-temperature and high-pressure pipelines and Its use method can allow six degrees of freedom to move the pipeline under the premise of maintaining the airtightness of the high-temperature and high-pressure pipeline, thereby realizing temperature difference stress compensation and simplifying the pipeline

Method used

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  • Flexible connecting device of high-temperature and high-pressure pipeline and using method of flexible connecting device
  • Flexible connecting device of high-temperature and high-pressure pipeline and using method of flexible connecting device
  • Flexible connecting device of high-temperature and high-pressure pipeline and using method of flexible connecting device

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Effect test

Embodiment 1

[0038] Such as figure 1As shown, this embodiment provides a pipe connection device, including a first pipe 1 and a second pipe 2, and the first pipe 1 and the second pipe 2 are respectively set on two mounting flanges on the left and right sides. 3, the two mounting flanges 3 are passed through by screw rods, and the screw rods are fastened by mounting bolts and nuts 4, and the mounting bolts and nuts 4 are located on the outside of the mounting flange 3, and the mounting flange 3 has a limiting groove 5 , there is a seal in the limiting groove 5, and there is a cage 9 between the limiting groove 5 and the limiting groove 5, and the cage 9 is in sealing connection with the sealing member, and the cage 9 is located on the mounting flange 3 On the inner side, the first pipe 1 and the second pipe 2 pass through the seal and are located in the holder holder 9 (the end surface contact or butt joint of the first pipe 1 and the second pipe 2 is located in the holder holder 9), so Th...

Embodiment 2

[0044] Such as figure 1 As shown, the quantity of metal sealing gasket 6 and composite molten salt gasket 7 varies with the pressure of the two pipelines. If the pressure is high, a few more layers can be placed, and if the pressure is low, a few layers can be placed. Even if some metal sealing gaskets 6 and composite molten salt gaskets The gasket 7 is located outside the limiting groove 5, and the metal gasket 6 is always in contact with the cage 9 through the metal hollow sealing ring 8 for end-face sealing. Metal hollow sealing ring 8 is made of high-temperature-resistant metal tube, filled with inert gas, and the inert gas expands after being heated, which can ensure the close contact between metal hollow sealing ring 8 and metal gasket 6 to play the role of end face sealing under high temperature. Alternate distribution of metal sealing pads 6 and composite molten salt gaskets 7, under the condition of pressure and constraints on the outer periphery of the two pipes, the...

Embodiment 3

[0047] Although the first pipe 1 and the second pipe 2 are in close contact with the metal sealing gasket 6 and the composite molten salt gasket 7, they can still expand and contract in the axial direction of the first pipe 1 and the second pipe 2, that is, the left, right and left sides can be guaranteed. degrees of freedom to move in the right direction. There is a second movement gap 11 between the first pipe 1, the second pipe 2 and the cage 9, and a first movement gap 10 between the mounting flange 3 and the cage 9, which can ensure the pipes to expand up, down, forward and backward. Time-lapse free movement. The cage 9 is connected to the fixed bracket 12 and remains stationary. The metal hollow sealing ring 8 and the metal gasket 6 are adjusted by adjusting the contact distance between the metal gasket 6 and the cage 9 by adjusting the mounting bolts and nuts 4. The relative displacement between the ring 8 and the metal gasket 6, but can still maintain close contact. ...

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Abstract

The invention discloses a flexible connecting device of a high-temperature and high-pressure pipeline and a using method of the flexible connecting device, relates to the technical field of pipeline connection, and solves the problems of pipeline temperature difference stress compensation and airtight sealing. The flexible connecting device comprises a first pipeline and a second pipeline, and the two pipelines are arranged on two mounting flanges on the left side and the right side respectively in a sleeving mode; the mounting flange is fastened through mounting bolts and nuts located on the outer side of the mounting flange, the mounting flange is provided with a limiting groove, metal pads, composite molten salt gaskets and other sealing pieces are alternately distributed in the limiting groove at intervals, a retainer is arranged between the limiting groove and the mounting flange, the retainer is connected with the sealing pieces in a sealed mode, and the retainer is located on the inner side of the mounting flange. The two pipelines penetrate through the sealing piece and the retainer, the using method includes the steps that the sealing piece and the retainer are sealed by adjusting the installation bolt and nut, and the two movement gaps provide movement space for deformation of the two pipelines; the device has the advantages that stress caused by thermal expansion and cold contraction of a connecting pipeline is compensated on six degrees of freedom, and the airtight sealing performance is kept under the cold and hot alternating working condition.

Description

technical field [0001] The present invention relates to the technical field of pipeline connection, and more specifically relates to the technical field of a flexible connection device for high-temperature and high-pressure pipelines and its application method. Background technique [0002] If the temperature of the medium transported by the pipeline is very high, it will cause thermal expansion of the pipeline after it is put into operation, and it will cause shrinkage of the pipeline when it stops running or is cooled. If the thermal expansion and contraction of the pipeline is constrained by the support hanger or its connected equipment, it will cause huge stress in the pipe wall or on some welds. Once the stress exceeds the strength limit of the pipe or weld, the pipeline will be damaged. cause damage and may even damage equipment connected to it. General pipelines can compensate for thermal expansion and contraction of pipelines by setting flexible connection devices s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16L27/12F16L51/00F16J15/453F16J15/447
CPCF16L27/12F16L51/00F16J15/453F16J15/4472
Inventor 梁世强王大为汪小武纪永盛江嘉伟李建格宋洋洋宋宁宁
Owner INST OF ENGINEERING THERMOPHYSICS - CHINESE ACAD OF SCI
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