Fiber bragg grating sensor based intelligent flange gasket

Abstract

The invention provides a fiber bragg grating sensor based intelligent flange gasket. The fiber bragg grating sensor based intelligent flange gasket is structurally provided with a metal framework (1), wherein a radial fiber bragg grating temperature sensor (4) and a peripheral fiber bragg grating strain sensor (5) are installed on the metal framework (1). The fiber bragg grating sensor based intelligent flange gasket can achieve integration of a sealing function and a monitoring function, a sealing failure state of the gasket can be timely found so as to take preventive measures for avoiding disastrous accidents, and the fiber bragg grating sensor based intelligent flange gasket can be installed and used without existing flange structure change and is suitable for an established flange system.

Description

technical field [0001] The invention relates to a flange gasket, in particular to an intelligent flange gasket based on optical fiber grating sensing. Background technique [0002] Gasket is an extremely important sealing element in flange connection, and its performance directly affects safe production. [0003] The sealing failure of existing flange gaskets in actual use is mainly due to the interface leakage caused by the pretightening force of the sealing contact surface being less than the medium pressure therein. The contact stress of the gasket is insufficient due to the decrease of the bolt pre-tightening force during use; the second is that the contact stress of the gasket is reduced due to the creep and stress relaxation of the gasket itself. [0004] At present, there are mainly two types of monitoring technologies for the sealing condition of flange gaskets: the first method is to measure the bolt pre-tightening force through a specific detection device during t...

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Problems solved by technology

[0003] The sealing failure of the existing flange gaskets in actual use is mainly due to the interface leakage caused by the pre-tightening force of the sealing contact surface being less than the medium pressure in it. The main influencing factors include: First, due to the actual pressure of the flange The gasket contact stress is insufficient due to the decrease of the bolt pretightening force during use; the second is the decrease of the gasket contact stress due to the creep and stress relaxation of the gasket itself

[0004] At present, there are two main types of flange gasket sealing state monitoring technologies: the first method is to measure the pre-tightening force of the bolts through a specific detection device during the initial installation of the flange gasket. The disadvantage of this method is that It is impossible to detect possible pre-tightening force drop in time during the actual use of the flange; the second method is to measure the creep and stress relaxation properties of the gasket material, as well as the compression rate, through a special detection device during the flange gasket design stage - Rebound rate, etc. The disadvantage of this method is that it can only reflect the performance parameters of the gasket material sample under specific test conditions, and cannot reflect the performance changes of the gasket during actual use

[0005] Due to the above shortcomings of the existing monitoring methods, it is not possible to effectively monitor the failure state of the gasket seal during the actual use of the flange.

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