What is a double suction pump? What is a single suction pump? What are the differences between the two?
Release time:
2021-12-09
Source:
The double suction pump is also known as a single-stage double suction centrifugal pump, while the single suction pump is referred to as a single-stage single suction centrifugal pump or a single-stage single suction clear water centrifugal pump.
The double suction pump is also known as a single-stage double suction centrifugal pump, while the single suction pump is referred to as a single-stage single suction centrifugal pump or a single-stage single suction clear water centrifugal pump.
The single suction pump has a horizontal axial intake and radial discharge. The single-stage pump has a suspended structure, allowing for maintenance without removing the inlet and outlet pipelines, enabling direct removal of the rotor components for servicing. The single-stage pump can be connected to the motor via an elastic coupling or an extended elastic coupling, with the shaft seal using a soft packing seal. The bearings are lubricated with oil using single-row radial ball bearings. From the motor's perspective, the single-stage pump rotates clockwise, and most pumps rotate clockwise; however, they can rotate counterclockwise based on user requirements.
Single-stage pumps generally adopt excellent hydraulic models, decomposed and combined based on the parameters of IS centrifugal pump models and vertical pumps, designed and manufactured strictly according to national standards. Single-stage single suction centrifugal pumps are suitable for transporting clear water and liquids with physical and chemical properties similar to water, with a usage temperature of <80℃.
The differences between the two include water intake, working principle, flow rate, and price. Below we will mainly explain these four differences between double suction pumps and single suction pumps.
1. Different water intake
The double suction pump is literally interpreted as having water intake at both ends of the impeller. The single suction pump is literally interpreted as having water intake from one end of the impeller.
2. Different working principles
Working principle of the double suction pump: The impeller of the double suction centrifugal pump is actually composed of two back-to-back impellers, with the water flowing out from the impeller entering a volute.
Working principle of the single suction pump: After starting, the shaft of the single-stage single suction centrifugal pump guides the impeller to perform high-speed rotational motion, pre-filling the liquid between the blades for rotation. Under the action of inertial centrifugal force, the liquid moves radially outward from the center of the impeller. During this movement process, the liquid gains energy, static pressure increases, and flow velocity rises. After leaving the impeller and entering the pump casing, the flow path inside gradually widens, slowing down the speed and converting part of its kinetic energy into static pressure energy before flowing tangentially into the discharge pipeline. Therefore, the volute casing not only serves as a component for liquid exiting from the impeller but also acts as a rotating device. As liquid is flung outward from the center of the impeller, a low-pressure area forms at the center of the impeller. Under the influence of potential energy difference between the liquid level in the reservoir and that at the center of the impeller, liquid is drawn into the center of the impeller. With continuous operation of the impeller, liquid is continuously sucked in and discharged. This cyclical motion process is referred to as the working principle of a single suction pump.
3. Different flow rates
Double suction centrifugal pumps are mainly used in low working environments with large flow rates. Single suction centrifugal pumps have relatively lower flow rates. For equivalent flow rates, single suction pumps are smaller in size but have greater axial forces and heavier bearing loads.
4. Different prices
The manufacturing cost of double suction pumps is higher, resulting in slightly higher prices compared to single suction pumps. The cost of single suction pumps is lower than that of double suction pumps, making them reasonably priced and widely used; however, in many aspects, double suction pumps perform better.
Single suction pump
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