| 摘要 |
A draining device for the removal of excess liquid in devices of the type wherein liquid is pumped from a liquid supply (8) to a location of use and excess liquid is collected and removed periodically, comprises at least one draining conduit (14, 14a) connected to the suction conduit (9) between the liquid supply (8) and the location of use. A valve (15, 16, 28a), keeps the or each draining conduit (14) closed when the amount of collected excess liquid is below a preselected limit value, the location of use then being supplied with liquid only from the liquid supply (8). The or each valve (15, 16, 28a) opens the corresponding draining conduit (14) when the amount of collected excess liquid exceeds the limit value so as to re-circulate the collected excess liquid to the location of use. The draining device is preferably used in a cooling unit for cooling air by means of evaporation of water, and the invention also comprises a device for cooling air by evaporation of a liquid in a surface-enlarged evaporation block (6) comprising said draining device. |
