Enhancement type multi-layer S type metal bellows
A metal bellows, enhanced technology, applied in the direction of hoses, pipes, pipes/pipe joints/fittings, etc., can solve the problem of inability to meet the requirements of large-diameter high-pressure pipelines for large displacement compensation, and achieve formability. , avoid disassembly problems, good fatigue life effect
Inactive Publication Date: 2013-03-27
NO 11 INST OF NO 6 ACADEMY OF CHINA AEROSPACE SCI & TECH
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Problems solved by technology
[0003] In order to overcome the deficiencies of the prior art, the present invention provides an enhanced multi-layer S-shaped metal bellows. The bellows provided by the present invention can greatly improve the pressure resistance under the premise of ensuring good displacement compensation capability and fatigue life, so that It overcomes the disadvantage that commonly used non-reinforced S-type bellows or other types of bellows cannot meet the large-diameter high-pressure pipeline's large-displacement compensation capability requirements
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Embodiment 1
[0034] The enhanced S-shaped bellows with a diameter of 270mm and a total height of 380mm are made of 316L stainless steel, with 12 layers, a wave number of 8, a slenderness ratio of 1, a single layer thickness of 0.3mm, and a peak and valley radius of 11mm. The wave pitch ratio is 0.95, the maximum involute gap is 3.7mm, and the pressure resistance is 35MPa.
Embodiment 2
[0036] Enhanced S-shaped bellows with a diameter of 520mm and a total height of 800mm. The material is 1Cr18Ni9Ti stainless steel. The distance ratio is 1.25, the maximum involute gap is 8.3mm, and the pressure resistance is 38MPa.
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The invention provides an enhancement type multi-layer S type metal bellows which comprises an expansion joint and an enhancement component, wherein the enhancement component comprises a plurality of enhancement rings and two end head armored rings, the expansion joint comprises straight edge sections arranged at two ends and a plurality of sequentially-connected wave nodes arranged in the middle of the two straight edge sections, and each wave node consists of an arc type wave trough, linear transition sections respectively arranged at two ends of the wave trough, and arc type wave peaks respectively connected with the transition sections; and the adjoining wave nodes are connected with each other by the arc type wave peaks. According to the enhancement type multi-layer S type metal bellows provided by the invention, the pressure resistance can be greatly improved on the premise that good displacement compensation capability and long fatigue life are guaranteed, so that the defect that the common enhancement-free S type bellows and the bellows of other types can not meet the requirement of the large-displacement compensation capability of a large-caliber and high-pressure pipeline can be overcome.
Description
technical field [0001] The invention belongs to the field of liquid rocket engine manufacturing, and can be used in the structural configuration design of metal bellows that need to work under high pressure conditions in other technical fields, especially large-diameter high-pressure pipelines. Background technique [0002] Multi-layer thin-wall corrugated pipes are widely used in different technical fields, such as aerospace, petrochemical, thermal and other industries that need to ensure the movable connection of pipelines to compensate for their relative displacement. The most common waveforms are U-shaped and Ω-shaped. The waveform and forming process of S-shaped bellows are relatively complicated, but the pressure resistance, compensation ability, and fatigue life are greatly improved. Chinese Patent Publication No. CN2262153U, the public date is September 10, 1997, and the expiration date is January 11, 2006. The name is "S-type metal multilayer bellows elastic and fle...
Claims
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IPC IPC(8): F16L11/15
Inventor 徐学军杨亚龙黄道琼杨永红秦红强薛杰高祖兴张德禹
Owner NO 11 INST OF NO 6 ACADEMY OF CHINA AEROSPACE SCI & TECH
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