| 摘要 |
PURPOSE:To surely supply water at a set water level regardless of whether there is residual water or not by judging whether or not there is residual water in a water reservoir and setting up a new water level value when there is no residual water, by detecting the pressure at a point of inflexion of pressure when the water level passes an adapter and determining the water level of the water storage section, and when there is residual water, by using the previous water level standard value for the control of the water level. CONSTITUTION:There is no change in the pressure until the supply water to a water reservoir 1 reaches an adapter 2. As soon as the water level in the reservoir 1 goes across the adapter 2 the pressure starts rising. The detection of the residual water is, therefore, carried out before starting water supply operation. When there is no residual water the point of inflection is detected to renew the water level standard value, and water is supplied according to that value. If there is residual water, a stored value is read out and water replenishing operation is carried out by that value. The judgement whether or not there is residual water is made by the circulation mode operation and it is judged by a water flow switch 9. This switch 9 is turned OFF if there is no residual water because air comes in from the water reservoir 1 and it is possible to judge. The period to make the judgement is the elasped time tB. If the water flow switch 9 is ON at this time, the value Px in the store and used in the previous judgement is used and water is replenished to the value of PA added to the value Px. |
