Air curtain generating mechanism

The utility model belongs to the technical field of dust sensor protection devices. The utility model provides an air curtain generating mechanism. The air curtain generating mechanism comprises a vacuum pump, a sample injector main body, an air inlet mouthpiece and a sample injector valve core, and the vacuum pump is connected with the air inlet mouthpiece through a pipeline. The air curtain generation mechanism provided by the utility model can generate protective gas around the gas to be detected, and the gas to be detected is protected so that the gas to be detected does not contact the dust sensor. The service life of the dust sensor is prolonged and the operation and maintenance cost is reduced. 本专利属于粉尘传感器保护装置技术领域。本专利提供了一种气幕发生机构，包括：真空泵、进样器主体、进气接嘴、进样器阀芯；所述真空泵通过管路与进气接嘴相连。本专利提供气幕发生机构能在待检测气体的周围生成保护气，对待检测气体进行保护使待检测气体不接触粉尘传感器。延长触粉尘传感器寿命，降低运行维护成本。