Self -suction pump is a type of centrifugal pump. The flow of the centrifugal pump can be adjusted through various methods. Under normal circumstances, the pump is most reasonable to work under the rated point conditions, but sometimes it will cause the pump to run at the small traffic conditions due to some reasons, which will cause some of the following negative negatives. Influence.

(1) Decrease efficiency and increase power consumption. Self -suction pumps generally make the highest efficiency point near the rated work point when designing. If the self -suction pump is running at a small traffic conditions, its operating efficiency will decrease quickly. Generally, the smaller the traffic flow of the same pump, the smaller the efficiency, so it is not economical to run under small traffic conditions of. Under normal circumstances, at this time, a suitable high -efficiency small pump is needed.

(2) Increased vibration noise, resulting in environmental pollution, damage to pump parts, and affecting the service life of the pump. At the design of the work conditions, due to the consistency of the direction of the liquid flow and the direction of the blade, the loss of loses, impact loss, and vortex loss are relatively small, which is close to zero. However, when the pump is working in a small traffic area, due to the deviation of the design point, the losses of the pump overcurrent parts, the impact loss, and the vortex loss have further increased. These losses are accompanied by a large amount of hydraulic noise and mechanical vibration.

(3) Internal return of pumps increases significantly, and the internal accumulation heat increases, which increases the temperature of the liquid in the pump, causing the heating of the pump body, which affects the mechanical performance of the pump parts. Inhalation conditions.

(4) The radial force of the self -suction pump increases, and the rotor of the deterioration pump. Because the pump is deviated from the design conditions when working in a small traffic area, the flow rate of the internal liquid in the aeral interior is reduced, but according to the speed triangle analysis, it can be seen that the liquid outflow speed in the leaf wheel increases. Radial force.