The pump characteristic test device includes auxiliary pump, flow measurement pipeline, pressure measurement pipeline, valve, measuring instrument and other auxiliary pipelines. Among them, the flow measurement pipeline, pressure measurement pipeline, valve, measuring instrument and other auxiliary pipelines are the same as the test device under the normal operating conditions of the pump. The difference is the choice of auxiliary pump. The flow and head of the auxiliary pump determine whether the test can be carried out smoothly. In general, the flow 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 torque measurement in the special working condition of zero speed should use a static torque sensor. The selection of its range can be calculated according to the output power of the auxiliary pump, but factors such as pipeline loss and pump loss 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 performance test of the pump running in the forward rotation, positive lift (the energy of the impeller outlet is greater than the inlet energy), positive flow (the liquid flows from the suction port to the discharge port), Positive torque (the prime mover transmits mechanical energy to the liquid) conditions. Contrary to the above, they are called reverse rotation, negative lift, negative flow, and negative torque. Under special operating conditions, the pump can operate under the condition that one or several of these parameters have negative values. The four-quadrant characteristics of the pump refer to the different combination characteristics of these parameters.
Due to the continuous expansion of the use range and field of water pumps, several pumps often run in series or in parallel, which may cause other pumps to run in an abnormal state due to the failure of one pump. In addition, due to the different use of the pump, the reverse operation of the pump may also occur. Therefore, people pay more and more attention to the use characteristics of pumps under various working conditions. Therefore, the study of the four-quadrant characteristics of the pump is very necessary for the research and design personnel of the pump user.