Air bag inflating and deflating system for blocking sewer

The utility model relates to the technical field of pipeline plugging, in particular to an air bag inflating and deflating system for sewer plugging, which comprises an air compressor, a first inflating system and a second inflating system, the first inflating system and the second inflating system are communicated with the air compressor and are arranged in parallel, the first inflating system is communicated with an air bag B, and the second inflating system is communicated with an air bag A; the first inflation system is connected with the first deflation system in series, the second inflation system is connected with the second deflation system in series, the first deflation system is connected with the second deflation system in parallel, and the first deflation system and the second deflation system are communicated to the vacuum pump. The inflation state is monitored in real time through the air flow, the pressure value is set in advance, inflation is stopped when the internal pressure of the air bag r