Sealing assembly of reversing device of pneumatic sample feeding system

The invention provides a pneumatic sample feeding system reversing device sealing assembly which comprises a fixed shaft, a rotating disc, a fixed shield and a fixed disc, the rotating disc sleeves the outer side of the fixed shaft, the fixed shield is arranged on one side of the fixed disc, a fixed seal I is arranged between the fixed shield and the fixed disc, a sleeve is arranged on the inner side of the fixed shield, and the fixed seal I is arranged on the outer side of the sleeve. A rotary seal is arranged on the side, close to the fixed disc, of the sleeve, an end face seal I is arranged between the rotary seal and the fixed disc, and a fixed seal II is arranged between the fixed disc and the fixed shaft. According to the reversing device of the pneumatic sample feeding system, when one-to-many pipeline conveying is carried out through rotation of the high-precision rotating platform, the sealing assembly adopts a multi-part and multi-form sealing combination assembly structure, so that good sealing per