High-net-aspirated foam applicator open closed bubble foam fire extinguishing foam nozzle nozzle

Introduction spray foam applicator is to produce and air foam fire extinguishing equipment, foam mixture by pipeline to the foam applicator, the intake air in the foam nozzle exit, the formation of air bubbles, spray in the danger zone to be protected, to achieve the purpose of extinguishing, mainly for low expansion foam sprinkler system. 2, extinguishing principle when a certain pressure when foam mixture flowing through the foam applicator cavity, due throttling the flow velocity increases, the pressure decreases, a negative pressure of the intake air, strike action by scattered inside the nozzle to form a certain multiple of air foam. 3, technical features with the nozzle spray foam fixed fire extinguishing system called foam sprinkler system. (1) Foam sprinkler system applies to A, B, C liquid may leak and inadequate fire-fighting facilities in place. Foam fire sprinkler system can play a role in addition to outside, but also play: ① a cooling effect on the protection of objects; ② other than burning other facilities to reduce heat radiation effect; ③ from the diaspora to the ground on the initial liquid fire suppression and control action. Foam sprinkler system is not deeper than 25mm of water-soluble liquid. (2) Foam sprinkler systems are generally divided inhaled air type (referred to as suction type) and non-inhaled air type (referred to as non-aspirated). When aspirating foam applicator should be used protein foam liquid YE, atmosphere protein foam liquid YEF, AFFF liquid YEQ or F protein resistant foam liquid YEDF6 like, when using non-aspirating foam applicator must be used AFFF fluid. (3) When using protein foam liquid or vapor bubble was the protection of non-soluble protein A, B, C liquid, its foam mixture supply strength not less than SL / (min · mZ), a continuous supply of time should not be less than 10min . Spray foam supply intensity and time is based on the continuous supply of domestic trials, with the provisions of the relevant foreign standards developed. (4) Foam sprinkler system should be set up automatic alarm device. System should adopt automatic control mode, but must have a manual control device. Set foam sprinkler system for timely and effective manner, the initial fire fighting or control, to avoid the spread of fire to expand. However, the automatic control is not complete with the will of the people, when there are failures, which requires a manual auxiliary control unit.