Fixed fire extinguishing apparatus

A fixed fire extinguishing apparatus, comprising:

• a housing, cartridges and an activation controller connected to each of the cartridges, wherein the cartridges are formed in an array in the housing;
• a bracket configured to support the cartridges is further provided in the housing;
• a top of the bracket is provided with a fixing holes matched with a structure of an outer wall of the cartridges;
• a bottom of each of the cartridges penetrates through the fixing holes and extends to a bottom of the bracket;
• a counter bore at a top of the housing;
• a spraying end of each of the cartridges extends into the counter bore;
• the bottom of each cartridge is fixedly connected with the bracket through a plurality of fixing devices which are connected;
• the plurality of fixing devices comprise a bolt fixed at the bottom of each of the cartridges, a nut matched with the bolt, a rotation-stopping main body that is clamped directly to the bottom of the bracket and a bump fixed on the rotation-stopping main body and clamped with the bolt;
• a through groove is provided on the bolt, a through-direction of the through groove is perpendicular to an extending direction of an axis of the bolt;
• the bump is embedded in the through groove to prevent rotation.