Self-suction type foam generator

The utility model discloses a foam generator which comprises an air distribution pipe, a three-way pipe fitting and a main pipeline in which a helical stirring block is arranged, wherein the air distribution pipe is communicated with an air inlet pipe for inputting high-pressure nitrogen, and a nozzle is fixed at the outlet end of the air distribution pipe; the first end opening of the three-way pipe fitting is communicated with the nozzle of the air distribution pipe; the second end opening of the three-way pipe fitting is communicated with the head end of a diffuser pipe, and the third end opening is a foaming agent suction opening; the main pipeline is provided with an inputting opening and a discharging opening; the tail end of the diffuser pipe is connected with the inputting opening of the main pipeline; the discharging opening of the main pipeline is connected with a discharging pipe. The self-suction type foam generator can continuously and stably generate uniform and high-quality nitrogen foams through a specific suction mixing and stirring machine; the whole generator occupies a small area and can meet a requirement for working in a small space; the maintenance cost is low.