The double-suction pump refers to the fact that the impeller has two suction ports instead of two impellers, which is indeed misleading for many people. The biggest advantage of this design is hydraulic symmetry, and theoretically, there is no axial force. The axial action is better than that of the single-suction pump. The double-suction pump has great advantages in balancing the axial force and runs more smoothly.

In many factories, the circulating pump site generally uses a double-suction pump to meet the requirements of relatively large flow. Some water plants, steel mills and municipal projects also use double suction pumps, and the larger flow can reach 10000m3/h. There are still many manufacturers of double-suction pumps in China.

The structure of double suction pump

1- pump body; 2- pump cover; 3- impeller; 4- shaft; 5- double suction sealing ring; 6- shaft sleeve; 7- packing sleeve; 8- packing;

9- packing ring; 10- packing gland; 11- bushing nut; 12- bearing body; 13- bearing body gland;

14-Deep groove ball bearing; 15-Coupling parts; 16-Bearing end cover

It should be emphasized that the horizontal single-stage double-suction pump adopts the middle-opening structure, and the joint surface of the pump body and the pump cover is generally the horizontal plane passing through the axis line, which is usually called the middle-opening surface.

Due to this structure, all parts in the pump can be inspected by opening the pump cover without dismantling the inlet and outlet pipelines, moving motors or other prime movers, and the inspection is extremely convenient.

Compared with the single-suction pump, the double-suction pump has a larger flow rate and better suction performance; compared with the mixed-flow pump, it has a higher lift.

The structural characteristics of the double suction pump

The impeller of the double-suction pump can be regarded as composed of two single-suction impellers back-to-back, just like the two impellers are arranged symmetrically, so it can be considered that no axial force will be generated during operation.

However, due to manufacturing and assembly reasons, there are always dimensional deviations, it is impossible to achieve absolute symmetry, and the liquid flow cannot be absolutely symmetrical, so there must be a residual axial force, so generally double-suction pumps are equipped with radial Rolling bearings to withstand residual axial forces.

Advantages of double suction pumps

Since the impeller has two suction ports, each inlet only needs to bear half the flow rate. Under the same speed and flow rate, the flow rate is relatively low due to the reduction of the inlet flow rate, and the impeller is not prone to cavitation.

That is to say, its anti-cavitation ability is stronger than that of the single-suction pump, which is definitely the advantage of the double-suction pump, so many customers are willing to use the double-suction pump. The reason is that the single-suction pump has one less seal, and the cost is relatively low because there is no need to consider cavitation.

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