Nonlinear gasket-based flange bolt pre-tightening load design method

A design method and flange bolt technology, applied in computer-aided design, calculation, special data processing applications, etc., can solve the problems of reducing the rebound performance of gaskets, leakage of flange connection system tightness, increase of flange deflection angle, etc. problem, to achieve the effect of improving safety
CN106971033AInactive Publication Date: 2017-07-21WUHAN INSTITUTE OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN Β· China
Current Assignee / Owner
WUHAN INSTITUTE OF TECHNOLOGY
Publication Date
2017-07-21
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a nonlinear gasket-based flange bolt pre-tightening load design method. The compression resilience performance of a gasket is analyzed; a relationship between unloading performance and bolt pre-tightening force of the gasket is discussed; a flange connection system is subjected to elastic analysis, and the nonlinear performance of a gasket material can enable the bolt pre-tightening force to be nonlinearly changed; a flange connection is subjected to coordination analysis of axial displacement; a law of change of gasket pressing force along with a working pressure and the bolt pre-tightening force is solved; a law of change of a flange deflection angle along with the working pressure and the bolt pre-tightening force is solved; the tightness of the bolt flange connection system is subjected to safety assessment; and a safety region of the nonlinear bolt pre-tightening force of a flange under the condition of a certain nominal pressure is given by integrating two aspects of the gasket pressing force and the flange deflection angle, so that the tightness of the bolt flange system reaches the best. According to the method, a simple and effective quantitative assessment method is given for the tightness of the normal-temperature flange connection system; a basis is provided for design and tightness assessment of the bolt flange connection system; and the safety is improved.
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Description

technical field

[0001] The invention belongs to the field of flange connection systems, and in particular relates to a method for designing the pretightening load of flange bolts based on nonlinear gaskets. Background technique

[0002] In pressure equipment and pipelines, due to the needs of production technology and installation and maintenance, detachable sealed connection structures are usually used. Among them, flange connection is the most typical detachable sealed connection, which is widely used in medium and low pressure vessels and pipelines. Although the flange connection is very practical in disassembly, there is always a potential leakage hazard. Even at normal temperature, if the working pressure and bolt pre-tightening force are not set properly, the rebound performance of the gasket will be reduced, and the stress of the gasket will be reduced. If the flange deflection angle increases, the tightness of the bolted flange connection system will be damaged due t...

Claims

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