Gas-liquid mixing device

A gas-liquid mixing device having a venturi structure in which a throat portion and an enlarged diameter portion connected to a downstream side of the throat portion and increasing in diameter toward the downstream side are provided in a main passage through which a liquid passes, the gas-liquid mixing device comprising:

• a ring-shaped collision chamber provided on an outer peripheral side of the enlarged diameter portion, and;
• a stirring chamber provided on a downstream side of the enlarged diameter portion, wherein
• a flow path on the downstream side of the enlarged diameter portion includes:
• a collision flow path that is connected to the collision chamber and causes a gas-liquid to collide with an outer peripheral wall of the collision chamber;
• a straight flow path that is connected to the stirring chamber and through which the gas-liquid passing through a central portion of the enlarged diameter portion travels straight;
• and an outer ring flow path through which the gas-liquid flows from the collision chamber to the stirring chamber, and
• the gas-liquid from the outer ring flow path and the gas-liquid from the straight flow path are stirred in the stirring chamber.