Premixing device and combustion device including the same

A premixing device which comprises

• a premixing flow path to which air is supplied from the outside and for generating a mixture by mixing fuel gas with the air,
• a partition wall section which divides the premixing flow path into a first flow path and a second flow path arranged in parallel, and
• a first fuel gas outlet and a second fuel gas outlet that are capable of discharging fuel gas into the first flow path and the second flow path by utilizing negative pressure generated by air flow in the first flow path and the second flow path,
• the premixing device comprising:
• a first blade section, provided in the first flow path, and provided with the first fuel gas outlet facing a downstream side in an air flow direction;
• a protruding wall section, provided on the first blade section so as to protrude from an edge section of the first fuel gas outlet towards a downstream side in the air flow direction;
• and
• a flapper, oscillating in a direction facing the first blade section, at a position downstream in the air flow direction than the first blade section within the first flow path, and being capable of opening and closing both the first flow path and the first fuel gas outlet according to an air flow rate of the premixing flow path while avoiding interference with the protruding wall section, and
• when the flapper is in an open state below a specified opening degree, a configuration being such that flow of air from the first flow path into the first fuel gas outlet is capable of being suppressed by the protruding wall section.