Sealed cavity leak detection method based on spontaneously expanding gas

Abstract

The invention provides a method for detecting the leakage of a seal chamber based on spontaneous expanding gas, and belongs to the technical field of leakage detection. The method specifically comprises the steps: placing a solid material, which can generate expanded gas when meeting heat or is volatile under the normal temperature, in the seal chamber as a reagent before the assembly of the seal chamber; carrying out the assembly to form the seal chamber, heating the seal chamber to proper temperature during leakage detection (there is no need of heating when a reagent is volatile under the normal temperature), and separating out the gas in the solid reagent, wherein the gas tends to overflow because of the miniature pressure difference generated by the gas. When the seal chamber has a leakage problem, the method can detect the gas outside the seal chamber. When the method is used for the detection of the leakage of the seal chamber, the method can effectively achieves the leakage detection of a seal chamber which is compact in structure or has any complex structure.

Description

technical field [0001] The invention relates to a leak testing method, in particular to a leak testing method based on spontaneously expanding gas, and belongs to the technical field of leak testing. Background technique [0002] In order to ensure the sealing effect of important industrial products, sealing requirements are often put forward in some places with compact structures, and it is stipulated that leak tests must be carried out. For example, with the continuous improvement of the aircraft's tactical indicators, it is required to fly faster and have a longer range, and the integrated design of the aircraft and the engine is high. In order to increase the range, the effective method is to increase the volume of the fuel tank. The increase in the space of the fuel tank results in a reduction in the space of the engine, a shorter length of the combustion chamber, and a more compact structure and layout. This type of structure is often due to structural and space const...

AI Technical Summary

Problems solved by technology

This type of structure is often due to structural and space constraints, commonly used leak detection sensors and instruments cannot go deep into the interior for testing; and because it is difficult to realize air inflation and liquid filling, traditional detection methods such as bubble leak detection, pressure difference method, and listening method cannot be effective. carry out

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