Flexible extension joint
A technology of expansion joints and flexibility, applied in the direction of pipes/pipe joints/fittings, expansion compensation devices for pipelines, mechanical equipment, etc., can solve problems such as poor scalability, easy leakage during use, and enlarged defects, and achieve good results. Stretchability, long service life, and high pressure resistance
Inactive Publication Date: 2012-07-18
SHANGHAI SHENGYIDE METALLURGICAL EQUIP TECH
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Problems solved by technology
However, the above-mentioned existing flexible joints still have the following deficiencies: 1. The bellows of the flexible joints are the main compensation components, and the bellows are hydraulically formed from seamless steel pipes. Wall thickness changes and structural performance changes will occur at the troughs and troughs, and the defects in the original material will be enlarged. After forming, fine cracks may appear at the crests and troughs of the bellows due to plastic deformation, so it is easy to leak during use. Disable flexible joints
[0003]2. The caliber of the existing flexible joints is usually above 100mm. After the corrugated pipe is hydroformed, it has high rigidity, poor flexibility and low pressure bearing capacity. Small, in the actual use process, it can only absorb axial displacement and a small amount of radial displacement. For those pipeline equipment with high pressure and large radial displacement requirements, the existing flexible joints cannot meet the requirements
The use of welded bellows has good durability, flexibility, air tightness, and high pressure bearing characteristics. However, in actual work, there are still shortcomings in the use of high-pressure and large-displacement pipelines. people are satisfied
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[0023] see figure 1 , figure 1 It is a half-sectional schematic diagram of an embodiment of the flexible expansion joint of the present invention. It can be seen from the figure that the composition of the flexible expansion joint of the present invention is that the first flange 1 and the second flange 21 are sequentially welded coaxially along the gas flow direction The first connecting pipe 2, the first circular ring plate 4, the first working flexible bellows 5, the first balance ring plate 6, the first large-diameter connecting pipe 7, the second circular ring plate 9, and the balance flexible corrugated The pipe 10, the third circular ring plate 11, the second larger diameter connecting pipe 13, the second balance ring plate 14, the second working flexible bellows, the fourth circular ring plate 18 and the second connecting pipe 20, this embodiment The second working flexible bellows described in is formed by welding the working flexible bellows 15 and the working flexi...
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A flexible extension joint is formed by coaxially welding a first working flexible bellows, a balancing flexible bellows with a large area and a second working flexible bellows between two flanges. The working flexible bellows and the balancing flexible bellows are welding type piece-shaped bellows formed by a plurality of S-shaped wavy stainless steel ring pieces. The flexible extension joint is suitable for fluid conveying pipelines for gas, oil, water and the like, the requirements for axial displacement and horizontal displacement of the pipelines caused by expansion caused by heat and contraction caused by cold can be met, the flexible extension joint has the advantages of good extension and air tightness, high pressure resistance and long service life, and the effect of enabling absorption of pipe pressure thrust to be zero is achieved.
Description
technical field [0001] The invention relates to a gas transmission pipeline, in particular to a flexible expansion joint for straight pipeline equipment. The flexible expansion joint of the present invention is suitable for gas pipelines, oil pipelines and water pipelines, not only can meet the requirements of axial displacement and lateral displacement caused by thermal expansion and contraction of pipelines, but also has good scalability, air tightness and high pressure resistance And the characteristics of long service life, can absorb the pipeline pressure thrust to achieve zero effect. Background technique [0002] In the high-pressure pipelines of metallurgical and chemical systems, in order to compensate the displacement caused by thermal expansion and contraction of the pipeline, to protect the pipeline and avoid the damage caused by the displacement of the pipeline due to thermal expansion and contraction, flexible joints are often used. Existing flexible joints ar...
Claims
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IPC IPC(8): F16L51/03
Inventor 高鸿骧
Owner SHANGHAI SHENGYIDE METALLURGICAL EQUIP TECH