Novel concentration-pressure sensing type flow control device

The utility model discloses a novel concentration-pressure sensing type flow control device. Box body, wherein the box body comprises an air inlet, an extraction opening and a slag discharging opening; the extraction opening comprises a main extraction pipeline and a low-concentration extraction pipeline; one side of the extraction opening is fixedly connected with a three-way pneumatic valve; thethree-way pneumatic valve is respectively communicated with the main extraction pipeline and the low-concentration extraction pipeline; the top surface of the box body is fixedly connected with a pressure sensor and a gas concentration sensor; gas is controlled to flow to the main extraction pipeline or the low-concentration extraction pipeline through opening and closing of the three-way pneumatic valve; the gas extraction negative pressure supply channel, namely the channel from the box body to the temporary extraction system pipeline, is automatically adjusted by detecting the concentration and the pressure of dri