Submersible pump energy saving system upgrade

Design high efficiency of submersible pump

Pump itself loss can be divided into hydraulic loss, mechanical loss and volume loss. After the selection of the pump structure, it can be considered that the mechanical loss and volume loss are basically unchanged, so the energy saving of the pump itself should focus on reducing the hydraulic loss in the pump, and the following measures can be taken:

(1) select excellent hydraulic models;

(2) adopt advanced hydraulic design methods;

(3) combining the traditional design method, CAD/CFD technology and experimental means, and using CFD technology to predict the pump performance;

(4) reasonable selection of materials, increase the service life of wearing parts, improve the reliability and average life of the pump.

Two, submersible pump production efficiency

An efficient pump must be manufactured at a high technological level. In order to ensure pump design performance, first of all to improve the accuracy of manufacturing manufacturers should strive to improve the quality of parts casting, in order to ensure the accuracy of size and shape, to try to polish the flow channel of the pump, in order to improve the surface finish of the flow part, so as to reduce the friction resistance to the fluid. Secondly, the roughness of flow components is reduced to reduce the hydraulic loss of the pump and improve the efficiency of the pump. Choose the material of the parts in the gap reasonably, improve the anti-bite and wear resistance, reduce the gap value appropriately, and reduce the volume loss.

Three, submersible pump system energy saving

Each pump has a set of performance curves, corresponding to a flow value, can find its corresponding head, power and efficiency values. In general, we call this set of corresponding parameters as the operating point, corresponding to the highest

The efficiency point is called the optimal operating condition point. The intersection point of the flow-head performance curve and the pipeline characteristic curve is called the operating condition point of the pump. The operating point varies with the flow rate and head of the pump, while the characteristic curve of the pipeline basically remains unchanged in a given water supply pipeline system. In the actual use of the pump, the operating point of the pump should coincide with the optimal operating point, or close to the optimal operating point, so as to keep the pump in the high-efficiency operation area, so as to achieve the purpose of energy saving. The pump has been selected

The more departments that pass through the process, the larger the safety margin is left, which not only causes a lot of waste, some even can't work properly. Many efficient pumps operate far from the optimal operating point, with high energy consumption and low device efficiency. Determine the correct geometric mounting height of the pump

Degree is an important condition to ensure the pump does not produce cavitation when working under design condition. In practical work, people only pay attention to the flow rate and head, but often ignore the cavitation performance of the pump. Some installation personnel on the theoretical performance of the pump is not very understanding, not and never to calculate

Calculate the allowable installation height of the pump, only according to the past experience to determine the installation height of the pump; Some installation personnel think that the pump head is larger, the installation height is larger; Or due to the suction pipeline system resistance loss is not estimated enough, medium temperature fluctuation estimation

Insufficient counting, insufficient estimation of the change of the liquid level in the suction tank and other reasons, make the pump operate under the potential cavitation state, causing the damage of the pump faster, or cavitation, can not work. Therefore, it is of great significance to correctly determine the geometric installation height of the pump for energy conservation.