The performance parameters of the water pump indicate the performance of the water pump. However, the performance parameters are not isolated and static, but are interrelated and restrict each other. For a specific pump, this connection and restriction has certain regularity. The law of change between them, usually expressed by a curve, is called the pump performance curve. It is extremely important to fully understand the performance of the pump, to be familiar with the characteristics of the performance curve, and to grasp the law of change. It is extremely important for rational selection and matching, correct determination of the installation height of the pump, adjustment of the pump operating conditions, and strengthening of the scientific management of the pumping station.
1. The performance curves of high-efficiency and energy-saving water pumps mainly include flow-head curve (Q-H), flow-power curve (Q-P), flow-efficiency curve (Q-η).
2. First, check whether the curve is flat and whether there is a hump. The flatter the curve of the high-efficiency and energy-saving water pump, the better. Of course, hump is not allowed. Second, look at which efficiency is higher. Then compare their scope which is wider, the wider the scope, the better the adjustment and use.
3. In production practice, it is necessary to refer to the performance curve of the pump to select the operating point of the pump, so that the pump can always operate in the rate range.
4. On the performance curve, for an arbitrary flow point, a set of head, power and efficiency values corresponding to it can be found. Usually, a set of corresponding parameters is called the best working point.
5. It is ideal for the pump to run at the most efficient point. However, the requirements of users are very different, not necessarily consistent with the performance under the most frequent point. For this reason, a range is specified (the efficiency drop is 5%~8% as the boundary), and the pump runs within this range, and the efficiency drop is not too large. This range is the pump's working range (also called range). Beyond this range, the efficiency is low and uneconomical.
