Pressure measuring apparatus arranged on air inlet pipeline

Disclosed is a pressure measuring apparatus arranged on an air inlet pipeline. The apparatus comprises an air inlet seat, a base, a vibrating diaphragm, a driving board, a pressure spring and a micro switch. The vibrating diaphragm covers a pressure cavity, the base and the air inlet seat are buckled together and are fixed together, the air inlet seat and the base clamp the radial edge of the vibrating diaphragm, and the pressure cavity is opposite to an accommodating cavity; the driving board is arranged in the accommodating cavity, a guide plate is in sliding fit with the side wall of a guide hole, a cylindrical spring seat is opposite to a tubular spring seat, the cylindrical spring seat is inserted into one end of the pressure spring, and the other end of the pressure spring is disposed in the tubular spring seat; and the micro switch is fixed on a switch seat, the button of the micro switch is opposite to the guide hole, and the button of the micro switch cooperates with a contact on the driving board. According to the utility model, by adopting such a structure, when pressure in an air supply pipeline exceeds pressure set by an air consuming apparatus, the micro switch acts to cut off power supply of a control valve of the air consuming apparatus or transmit signals to a control apparatus, and the control apparatus switches off the control valve, such that the safety purpose is achieved.