Patent ID: 7758024

Claim:
A microbubble generating device comprising: a source of water; a dissolving water making unit for sucking the water of the source and gas, and for making dissolving water in which the gas is dissolved in the water from a mixed liquid in which the water and the gas are mixed together, wherein the dissolving water making unit includes a gas dissolving device for dissolving the gas in the water; and a bubble generating unit for generating microbubbles from the dissolving water supplied from the dissolving water making unit, wherein the gas dissolving device includes a closed vessel; an inflow port provided in the closed vessel and for causing the mixed liquid sucked from the source to flow into the closed vessel; an exhaust valve provided in an upper portion of the closed vessel and for exhausting excess gas from the mixed liquid; and an outflow port provided near a bottom portion of the closed vessel and for causing the dissolving water to flow out from the closed vessel to the bubble generating unit, and wherein between the incoming port and the outgoing port, the closed vessel includes a retention region in which the dissolving water flows slowly, air is dissolved in the dissolving water to substantial saturation, and the dissolving water hardly contains fine bubbles.