Pressure vessel and fixed structure of blowdown straw thereof

The utility model provides a pressure vessel and fixed structure of blowdown straw thereof, pressure vessel has an at least bottleneck, install valve seat, blowdown valve, blowdown straw and business turn over pneumatic valve door on the bottleneck, the through -hole that goes through inside and outside both ends face is offered to the valve seat, and outer terminal surface is a drain to reach a business turn over gas port and put through the through -hole to the side of the valve seat, the blowdown straw is installed in the through -hole, and the through -hole internal diameter is greater than blowdown straw external diameter, and valve seat seal installation is on the bottleneck, the blowdown valve is installed on the drain, blowdown straw fixed connection in blowdown valve to inside stretching into pressure vessel, inside and outside blowdown valve intercommunication pressure vessel, be equipped with a positioner between blowdown straw and the valve seat through -hole, the fixed blowdown straw of positioner is for the flexible coupling between positioner and valve seat and/or the blowdown straw, the valve seat has the business turn over gas pocket of intercommunication through -hole to the pressure vessel in, business turn over pneumatic valve door is installed on the business turn over gas port, inside and outside business turn over pneumatic valve door intercommunication pressure vessel.