Water pump characteristic test device and definition

The water pump characteristic test device includes auxiliary pump, flow measuring pipeline, pressure measuring pipeline, valve, measuring instrument and other auxiliary pipelines. Among them, the flow measurement pipeline, pressure measurement pipeline, valve, measuring instrument and other auxiliary pipeline are the same as the test device under the normal operation condition of the pump. The difference is the choice of auxiliary pump. The flow rate and head of the auxiliary pump determine whether the test can be carried out smoothly. Under normal circumstances, the flow rate of the auxiliary pump used should be at least 2-3 times that of the tested pump, and the head should be at least 2-3 times that of the tested pump. The static torque sensor should be used to measure the torque under the special working condition of zero speed. The range selection can be calculated according to the output power of the auxiliary pump, but the pipeline loss, pump loss and other factors should be considered.

Generally speaking, the performance test of the water pump refers to the performance test under normal operating conditions. It is also the pump running in forward rotation, positive head (the outlet energy of the impeller is greater than the inlet energy), positive flow (the liquid flows from the suction port to the discharge port), Positive torque (the prime mover transfers mechanical energy to the liquid) under working conditions. The opposite of the above is called reverse, negative lift, negative flow, and negative torque, respectively. Under special operating conditions, the pump can operate under one or several of these parameters with negative value. The four-quadrant characteristics of the pump refer to the different combination characteristics of these parameters.

Due to the continuous expansion of the scope of use and the use of water pumps, there are often several pumps running in series or parallel, which may occur due to the failure of a pump, resulting in other pumps running under abnormal conditions. In addition, due to the use of different pumps, there may also be reverse operation of the pump. Therefore, people pay more and more attention to the use characteristics of the pump under various working conditions. Therefore, it is very necessary to study the four-quadrant characteristics of the pump for the research and design personnel of the pump users.