Pump characteristics curve and the best working point

Pump flow - lift characteristic curve generally has three types: flat type, steep drop type, hump type. Pumps for air-conditioning water circulation system should have flat features, the zero flow and the maximum flow between the lift change range should not exceed 10% -15%; steep drop characteristics of the pump due to its maximum flow and minimum flow between the lift too Large, so it should not be used; hump characteristics of the pump can not be used because of the parallel operation of the two pumps may cause load and lift cycle changes, and when the frequency of this change is equal to the natural frequency of the system will produce dangerous " Oscillation phenomenon ", and this phenomenon will have some impact on the normal operation of the system. The best working point of circulating pump is the intersection of pump characteristic curve and system pipe network characteristic curve. However, due to various reasons, the actual flow of the system is always greater than the design calculation flow, the result is to design the pump operating point offset to the right along the pump characteristic curve. When the working point of the pump is shifted to the right, the lift produced by the circulating pump is reduced, which is extremely unfavorable to the normal operation of the system. In particular, the most unfavorable loop in the system will further reduce the flow of the loop and affect the normal Use function There are mainly two reasons for the shift to the right of the work point. The first is that the hydraulic calculation in the design adopts an excessive safety factor and an unrealistic pressure drop calculation method. The second is that the designed system does not perform serious hydraulic balance calculation. After construction, Have not been rigorous system debugging. Therefore, in order to make the system run according to the design conditions, in addition to the relevant calculations should be carefully and carefully, but also in the selection of the pump when the pump operating point at the left side of the optimal choice of the appropriate location to prevent the pump actual working point Beyond a certain range in uneconomical operating conditions, affecting the normal operation of the system.

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