Sealed air inlet device for pipe orifice

The utility model discloses a sealed air inlet device for a pipe orifice. The sealed air inlet device for the pipe orifice comprises an air inlet insertion head, a sealing ring, an end opening sealing piece and a pressing piece, wherein an insertion section which can be inserted into a detection pipe is arranged at one end of the air inlet insertion head, the sealing ring is arranged on the outer wall of the insertion section in a sleeving mode and is used for being in sealing fit with the inner wall of the detection pipe, the end opening sealing piece is fixedly arranged on the air inlet insertion head, the end opening sealing piece presses the pipe orifice of the detection pipe so as to achieve sealing after the insertion section stretches into the detection pipe, and the pressing piece is used for pressing the end opening sealing piece to the pipe orifice of the detection pipe. According to the sealed air inlet device for the pipe orifice, a dual sealing structure is formed between the air inlet insertion head and the detection pipe. Compared with the prior art, the sealed air inlet device for the pipe orifice has the advantages that secondary sealing is added to the pipe orifice of the detection pipe, even if gas leakage occurs between the sealing ring and the inner wall of the detection pipe, gas can be effectively prevented from being leaked outside through secondary sealing, in this way, sealing between the air inlet insertion head and the detection pipe is effectively improved, and the reliability of a gas tightness detection result is guaranteed.