SEPARATE FLOW PATH TYPE OF GAS-AIR MIXING DEVICE

摘要

According to the present invention, a gas-air mixing device used in a gas boiler includes: 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 gas supply tube branched into a first gas flow path and a second gas flow path; a pneumatic valve which is connected to the inlet side of the gas supply tube in order to control the supply rate of gas being supplied to the gas supply tube; and a drive unit having one valve body connected to a rod that moves vertically up and down due to the magnetic force of an electromagnet; wherein the first gas flow path extends up to a boundary of the first air flow path and the second air flow path.