Gas mixing device for premixing gas

A gas mixing device for premixing gas is characterized by comprising a gas mixing cavity (1), one end of the gas mixing cavity (1) is connected with a multi-gas inlet pipe (2), the other end of the gas mixing cavity (1) is connected with a gas outlet pipe (3) communicated with an inner cavity of the gas mixing cavity (1), and the end, extending into the gas mixing cavity (1), of the multi-gas inlet pipe (2) is communicated with the gas inlet end of a hole net pipeline (4). The other end of the hole net pipeline (4) is a closed end; gas outlet holes are densely distributed in the circumferential direction of the hole net pipeline (4), and a baffle (5) with molecular sieve holes is arranged in one end, close to the gas outlet pipe (3), of the gas mixing cavity (1). The device is small in occupied area, and the length of the pipeline is effectively reduced. And the tempering of the torch can be effectively prevented, and the safety during gas mixing is improved. And gas combustion is more sufficient, and NOx gen