| 摘要 |
<p>PURPOSE:To keep an optimum mixture condition as to enhance safety and reliability by providing a mechanism for changing an inlet diameter of a branch pipe or a main pipe communicated with a confluent portion according to a flow velocity or a load, and controlling the flow velocity ratio and a pipe diameter ratio when the load is changed. CONSTITUTION:In mixture flow piping, high temperature water fluid A (hot water) and low temperature water fluid B (cold water) are mixed, thus producing mixture fluid C. A branch pipe 2 is welded in connection to a main pipe 1 for a main flow. A pipe diameter changing portion or a restriction part 3 is disposed in an inlet in a confluent portion of the branch pipe 2. A flow velocity ratio capable of optimizing mixture exists in a certain pipe diameter ratio. The optimum mixture condition is determined by the relation between the pipe diameter ratio and the flow velocity ratio. A pipe diameter is such deigned as to approximate to the relation under a rated operating condition. Since the flow velocity ratio is changed according to a change in load, the optimum mixture state cannot be kept in a constant pipe diameter ratio. Consequently, a pipe diameter is changed by the pipe diameter changing portion or the restriction part 3 so as to accord with the relation, thus keeping the optimum mixture condition.</p> |
