Pressure measuring device arranged on air inlet pipeline

The invention relates to a pressure measuring device arranged on an air inlet pipeline. The pressure measuring device comprises an air inlet seat, a base, a vibrating membrane, a driving plate, a pressure spring and a microswitch, wherein the vibrating membrane covers a pressure chamber, and the base and the air inlet seat are buckled and fixedly connected together; the air inlet seat and the base clamp the radial edge of the vibrating membrane, and the pressure chamber is opposite to a containing chamber; the driving plate is arranged in the containing chamber, and a guide plate is matched with the side wall of a guide hole in a sliding manner; a cylindrical spring seat is opposite to a tubular spring seat and is inserted into one end of the pressure spring, and the other end of the pressure spring is positioned in the tubular spring seat; the microswitch is fixed on a switch base, a button of the microswitch is opposite to the guide hole and is matched with a contact on the driving plate. As the structure is adopted, when the pressure in the air inlet pipeline is beyond the pressure set by an air consumption device, the microswitch acts to cut off a power supply of a control valve of the air consumption device, or a signal is transferred to a control device and the control device closes the control valve, and the purpose of safety is achieved.