Patent ID: 6945521

Claim:
A fluid mixing apparatus adapted to mix a first fluid and a second fluid with each other, characterized in that the apparatus includes a first fluid supply passage, a second fluid supply passage, and a mixing unit for mixing the first fluid and second fluid with each other to generate a mixed fluid, the first fluid supply passage branching out into a first passage and a second passage via a flow ratio regulator, the second passage branching out at a branching portion thereof into a third passage in which a flow ratio is set in advance, the third passage being connected to the mixing unit, the second fluid supply passage and a fourth passage being connected to the mixing unit, a mixed fluid generated by mixing with each other in the mixing unit the first fluid flowing from the third passage thereinto and the second fluid flowing from the second fluid supply passage thereinto being made to flow out into the fourth passage, the fourth passage joining the second passage or the first passage which is on the downstream side of the branching portion, the second passage joining the first passage.