Small pump selection
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There is a system that requires a pump with a capacity of 1 m3, a head of 80 meters, and the medium is diluted ammonia water. Do any sea friends have any suggestions?
Choose a vortex pump – it offers low flow rate but high head pressure.
Choose a vortex pump – it offers low flow rate but high head pressure.
It’s a gear pump – with such a low flow rate, it’s just right for use
I don’t have much experience with vortex pumps. What are the characteristics of these vortex pumps compared to conventional centrifugal pumps?
I don’t have much experience with vortex pumps. What are the characteristics of these vortex pumps compared to conventional centrifugal pumps?
Low flow rates are no problem; it’s the head capacity of the gear pump that is an issue. And it’s rather troublesome to maintain.
The impeller of a vortex pump is a disk of uniform thickness, with numerous radial vanes on both sides of its outer edge. On the pump casing at the corresponding position to the blade, there is an annular flow channel of constant cross-section; this entire flow channel is divided into a suction side and a discharge side by a partition, which are connected to the pump’s suction and discharge pipelines respectively. As the liquid inside the pump rotates along with the impeller, a certain centrifugal force is generated, pushing the liquid into the annular flow channel within the pump casing. Subject to the constraints imposed by the shape of this flow channel, the liquid is forced to flow back and enter another flow channel behind it, starting from the root of the blades. Therefore, the path of motion of the liquid between the blade and the annular flow channel is a helical path that moves forward with respect to the stationary pump casing ； For a rotating impeller, it is a backward spiral. Vortex pumps are named after this vortex motion of the liquid. The liquid can enter between the blades multiple times to absorb energy, until it is finally discharged from the outlet. The operation of a vortex pump is somewhat similar to that of a multi-stage centrifugal pump, but it lacks energy conversion devices such as the volute or guide vanes found in centrifugal pumps. Vortex pumps transfer energy to the liquid by performing work repeatedly in succession, which allows them to generate high pressures. During energy transfer, due to the repeated impacts of the liquid, significant energy loss occurs, resulting in a low efficiency of the pump, typically ranging from 20 to 50%. Vortex pumps are suitable only for applications that require a low flow rate (1–40 m3/h) and a high head (up to 250 meters), such as fire pumps, gasoline pumps in aircraft refueling trucks, and feed water pumps for small boilers.
This efficiency is too low. Vertical impellers definitely consume a lot of energy. Thank you.