▎ 摘　　要

NOVELTY - The utility model belongs to the technical field of gas sensor, especially a gas sensor based on graphene-metal structure, comprising a shell, an end cover and a sensor main body; the end cover is installed at the bottom end of the shell; the sensor main body is installed on the inner side of the shell; the top end of the shell is provided with an air inlet embedded with a filter screen; the top surface of the end cover is provided with a connecting ring for embedding the bottom end of the shell; the side wall of the connecting ring is provided with an elastic pushing component; the top surface of the end cover is provided with an elastic supporting component; The gas sensor of the utility model, the shell and the end cover are connected by elastic clamping; under the premise of ensuring the connection stability of the shell and the end cover, it is convenient to disassemble the shell, so as to dismantle the sensor main body for overhauling; the dismounting process will not damage the structure shape of the shell, which is very convenient; the elastic supporting assembly is provided with a buffer and stabilizing effect, ensuring the safety mounting of the stable, prolonging the service life of the sensor.