An anti-reverse pressure relief clean exhaust type columnar
fire extinguisher is characterized in that a
waist-hole-shaped side groove hole is formed in the edge of a heat insulation pressure bearing plate and used for allowing a starting thermosensitive line to penetrate through, an elastic piece is fixed to the end face of one side of a
medicine bin cavity of the heat insulation pressure bearing plate, and the elastic piece can completely shield the side groove hole under the action of high-pressure gas in the
medicine bin cavity; by eliminating reverse pressure relief of the inner cavity of the head sealing head, the clean discharging effect is improved. The long guide
piston component is adopted, the guide length can be increased, the capacity of a fire extinguishing agent is not reduced, the sliding stability and reliability of the
piston are improved, the purpose of clean
discharge is achieved cooperatively, a pressure relief structure is arranged between the
piston and a cylinder body or between the piston and a rear sealing head, and slow pressure relief of a propelling cavity can be formed when the piston moves to the clean
discharge limit position; the fire extinguishing agent can be completely discharged, the situation that the pressure in the propelling cavity is continuously increased due to
combustion of the redundant gas production explosive block can be prevented, and the accident that people are hurt due to explosion caused by the fact that the pressure in the propelling cavity is too high in the later
fire extinguisher disassembling process is eliminated.