open impeller slurry pump output

The Difference Between End Suction Centrifugal Pump And Double Suction Centrifugal Pump

First, the flow size is different

1. Double suction pump: equivalent to two single suction impellers of the same diameter working at the same time, the flow rate can be doubled under the same outer diameter of the impeller; the pump casing is horizontally opened, which is convenient for inspection and maintenance

2. End suction pump: Single-stage end suction centrifugal pump is a simple type of centrifugal pump. This kind of pump generally has a small flow rate and is mostly a small pump

Second, the structure composition is different

1. Double suction centrifugal pump: It is composed of two back-to-back impellers, and the water flow from the impellers merges into a volute.

As an important form of centrifugal pump, double suction pump is widely used in engineering because of its high lift and large flow. The impeller of this pump type is actually a combination of two back-to-back impellers, and the water flow from the impellers merges into a volute. The double-suction pump has the following characteristics: it is equivalent to two single-suction impellers of the same diameter working at the same time, and the flow rate can be doubled under the same outer diameter of the impeller; the pump casing is opened horizontally, which is convenient for inspection and maintenance. The inlet and outlet of the suction pump are in the same direction and perpendicular to the pump shaft, which is conducive to the arrangement and installation of the pump and the inlet and outlet pipes; the impeller structure of the double suction pump is symmetrical, there is no axial force, and the operation is relatively stable. In the areas along the Yellow River in my country, the pumping station has a large flow and a high head, and most of them use double-suction centrifugal pumps.

2. End-suction centrifugal pump: single-stage means that there is only one stage of impeller in the pump, and single-suction means that water is sucked from one side of the impeller.

The end suction pump sucks in horizontally and axially, and spit out radially upwards. The pump is a suspension structure, and the rotor parts can be returned for maintenance without dismantling the inlet and outlet pipelines during maintenance. The pump is connected with the motor through a common elastic coupling or an extended elastic coupling, and the shaft seal of the pump is sealed with a soft packing. The bearing is a single row radial ball bearing, lubricated with lubricating oil. From the motor side, the pump rotates clockwise.

When the end suction pump is started, the pump shaft drives the impeller to rotate at a high speed, forcing the liquid prefilled between the blades to rotate. Under the action of inertial centrifugal force, the liquid moves radially from the center of the impeller to the outer periphery. The liquid obtains energy in the movement process of flowing through the impeller, the static pressure energy increases, and the flow rate increases. When the liquid leaves the impeller and enters the pump casing, the velocity of the flow passage in the casing is gradually expanded and the velocity is extinguished, and part of the kinetic energy is converted into static pressure energy, and finally flows into the discharge pipeline along the tangential direction. Therefore, the volute pump casing is not only a component that collects the liquid flowing out of the impeller, but also an energy conversion device. When the liquid is thrown from the center of the impeller to the periphery, a low pressure area is formed in the center of the impeller, and the liquid is sucked into the center of the impeller under the action of the total potential energy difference between the liquid level of the storage tank and the center of the impeller. Relying on the continuous operation of the impeller, the liquid is continuously sucked in and discharged. The mechanical energy obtained by the liquid in the centrifugal pump is ultimately manifested as an increase in the static pressure energy.

The end-suction centrifugal pump means that only one end of the impeller enters the water, and the double-suction pump means that both ends of the impeller enter the water, that is, two inlets.

3. Different performance characteristics

1. The double suction centrifugal pump is more suitable for conveying large flow and requiring stable operation. When the flow rate of the pump is very high, if it is a single-suction pump, the inlet and outlet diameters of the pump should be large. If a double-suction pump is used, the size and weight of the pump can be relatively reduced, the rotational speed can also be increased, and the volumetric efficiency can be increased.

2. The anti-cavitation ability of the double suction pump is stronger than that of the single suction pump. Since the medium is inhaled at both ends of the impeller, hydraulic symmetry will be formed, so that the balanced axial thrust of the double-suction pump is better than that of the single-suction pump, and the operation is more stable. Moreover, the flow rate of the medium is low, and the impeller is not prone to cavitation.

The double suction pump mainly sucks the medium at both ends of the impeller, and there is a sealing cavity on each side of the impeller. Instead the pump has two suction ports. The anti-cavitation capability of the double-suction pump is stronger than that of the single-suction pump. Since the medium is sucked at both ends of the impeller, hydraulic symmetry will be formed, so the balanced axial thrust of the double-suction pump is better than that of the end-suction pump, and the operation is more stable. Moreover, the flow rate of the medium is low, and the impeller is not prone to cavitation. However, the double-suction pump has one more sealing cavity than the single-suction pump, so its cost is relatively high.

4. Different application scenarios

The end suction pump is a kind of water pump widely used in agriculture. Double suction pumps are mostly used for water supply and drainage in mines, cities, power stations, and various water conservancy projects.

The end-suction pump generally has a small flow rate. The advantage is that the same flow rate has a small end-suction volume, but the axial force is large and the bearing burden is large. Compared with double suction pumps, there are many limitations. In terms of use, the advantages of the double-suction sewage pump are more obvious.