| 摘要 |
An adjustment device for obtaining the maximum efficiency for water turbines having adjustable runner blades and guide rails and test probes provided in the draft tube after the turbine. The purpose of the present invention is to provide an adjusting device having a very simple design, a very high sensibility and which can distinguish inclined flow against the measuring position or the transmitter from rotation. These tasks have been solved in that the test probes (16) are provided in pairs at some distance from each other and substantially radially from the centre axis (22) of the draft tube (15) and mainly at the same level, that the test probes (16) are disc-formed with mainly symmetrical wing profile and on each flat side being equipped with at least one measurement spot (17a, 17b), that the measurement spots (17a, 17b) belonging to each probe are connected to one side each of a pressure difference transmitter (19, 20), and that the pressure difference transmitters (19, 20) are arranged to emit signals, which are proportional to the horizontal speed component of the recorded rotational speed of the water and which signals are used for adjusting the pitch of the guide rails. |
