SEPARATE FLOW PATH TYPE OF AIR-GAS MIXING DEVICE

摘要

According to the present invention, a gas-air mixing device used in a gas boiler comprises: a gas supply tube branched into a first gas flow path and a second gas flow path; an air supply tube branched into a first air flow path and a second air flow path by means of an air-flow-path branching apparatus; a pressure valve which is connected to the inlet port side of the gas supply tube in order to adjust the supply rate of gas being supplied to the gas supply tube; and a drive unit in which two valve bodies are connected to a rod that moves vertically up and down due to the magnetic force of an electromagnet; and the air-flow-path branching apparatus is formed so as to have a slot that can link through to either the first air flow path or the second air flow path, and so as to have a joining part which the rod can pass through in a position corresponding to the slot.