And air path system is used for detecting air tightness of air pressure element

The utility model discloses an air path system for detecting the air tightness of an air pressure element. The air path system comprises an air source mechanism, a two-way switch valve and a pressuresensor, the air source mechanism is connected to the two-way switch valve through a first inflation pipeline, the two-way switch valve is connected to the air pressure element through a second inflation pipeline, the pressure sensor is used for checking the air pressure of the second inflation pipeline, and the air path system further comprises a three-way switch valve. The three-way switch valveis at least provided with an air inlet, an air outlet and a pressure relief opening, and the air inlet and the air outlet are connected to the first inflation pipeline; the three-way switch valve further has a first state, a second state, a third state and a fourth state, wherein the first state enables the air inlet to be communicated with the air outlet and enables the air inlet, the air outletand the pressure relief ope