Before the brushless DC pump runs, the pump cavity must be filled with liquid before it can run. Then, does the inlet flow rate affect the pump's operation and delivery during the brushless DC pump operation? The inlet flow rate will definitely have an impact, and the following analysis will be made:   The setting principle of the diameter of the outlet and inlet of the brushless DC pump: Generally, the outlet diameter is selected according to the economic flow rate, and the outlet diameter is determined by the flow rate. When the pipe diameter is less than 250, it is 1～1.2m/s, and when the pipe diameter is 250～1000, it is 1.2. ~1.6 m/s. Technically, the speed of the water flow should not exceed 2.5~3.0m/s, and the low speed should not be less than 0.6 m/s (to prevent deposition).

First, the inlet flow rate is small, disadvantages
1. Under the same flow rate, the pipe diameter needs to be large, and the pipeline cost is high;
2. For some easy-to-sediment media, if the flow rate is too small, it is easy to cause sedimentation blockage;
3. The impeller inlet is large, the diameter of the mouth ring is large, and the leakage is large.

Second, the inlet flow rate is small, the advantages
1. It is beneficial to increase the NPSHA of the device's cavitation margin, and the pump is not easy to cavitation;
2. The scouring of the pipeline is small, especially the medium containing particles;
3. It is not easy to generate static electricity; the pressure drop of the inlet filter is small; in the same section, the medium flows evenly and the hydraulic loss is small.

The water inlet of the pump is generally larger than the outlet diameter. Whether the diameter of the inlet and outlet pipes of the brushless DC pump must be larger than the inlet and outlet diameter of the pump itself, this problem needs to be analyzed in detail. For most brushless DC water pumps, the purpose of increasing the diameter of the inlet and outlet pipes is to reduce the flow velocity of the fluid in the pipe, so as to reduce the resistance of the pipe and reduce the power consumption of the brushless DC water pump. However, increasing the pipe diameter is The increase in pipeline investment costs is at the expense. In this way, for the pipeline with a long-distance pump outlet, it can be considered to increase the pipe diameter appropriately to reduce the resistance drop, but for short-distance pipelines, it is not necessary to consider; and the material conveyed by the pump inlet is liquefied For materials that are prone to cavitation, such as gas, temperature close to the boiling point, and relatively low suction position, consider increasing the diameter of the pump inlet pipe to reduce the resistance drop and avoid cavitation of the pump.

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