What is the difference between double suction pumps and single suction pumps?

The main difference between double suction pumps and single suction pumps is the impeller. The single suction impeller absorbs water on one side, and the front and rear covers of the impeller are asymmetric. The double suction impeller absorbs water on both sides, and the impeller cover is symmetric. Usually, large-flow centrifugal pumps use double suction impellers.

Horizontal split case pump is equivalent to two single suction impellers of the same diameter working at the same time. Under the condition of the same impeller outer diameter, the flow rate can be doubled. Horizontal split case pump housing is split horizontally, which is convenient for inspection and maintenance. At the same time, the inlet and outlet of the double suction pump are consistent with the direction of the inlet and outlet of the pump and perpendicular to the axis of the pump, which is conducive to the arrangement and installation of the pump and the inlet and outlet pipelines. The impeller structure of the double suction pump is symmetrical, and although there is no axial force, the operation is relatively stable.

Single suction pumps, also known as end suction pumps, have the advantages of smooth operation, simple structure, easy repair and maintenance, easy installation, small installation area and so on. Single suction pumps have low cost, fair price and wide range of applications. Single suction pumps have small flow rate, equal flow rate, small volume, but large axial force and bearing load.

The basic components of a single suction pump are a high-speed rotating impeller and a fixed snail-shaped pump housing. The impeller with several (usually 4 to 12) reverse-curved blades is fixed on the pump shaft, and the motor drives the pump shaft to rotate at high speed. The impeller is the part that directly acts on the liquid in the pump and is the energy supply device of the centrifugal pump. The suction port in the center of the pump housing is connected to the suction pipe, and a one-way bottom valve is provided at the bottom of the suction pipe. The discharge port on the side of the pump housing is connected to the discharge pipe with an adjustment valve.