Working Principle of Submersible Slurry Pump

A submersible slurry pump is a kind of centrifugal pump from the principle of physics. Conceptually, it refers to a machine that adds energy to solid and liquid mixed media through the effect of centrifugal force (the rotation of the pump's impeller) and converts electrical energy into a device for the kinetic and potential energy of a medium. The name of the submersible slurry pump is a centrifugal pump that is distinguished from the point of view of the conveying medium.

The connection between the centrifugal pump and the submersible slurry pump

Firstly describe the connection between the centrifugal pump and the submersible slurry pump, and then the principle of the submersible slurry pump is naturally clear. The concept of centrifugation is from the pump itself. There are many types of pumps, and dozens of categories can be distinguished according to different viewpoints. The centrifugal pump is distinguished from the working principle of the pump. It is the process of pressurizing the transport medium through the effect of centrifugal force. In addition, there are common varieties including the screw principle, plunger principle, etc. which can distinguish pumps different from the centrifugal principle. After talking about the centrifugal pump concept, let's talk about the submersible slurry pump. The submersible slurry pump distinguishes the pump from another point of view, that is, the transport medium. As the name implies, the submersible slurry pump transports a mixture of solid particles containing dross and water. However, in principle, the submersible slurry pump is a type of centrifugal pump. In this way, the two concepts are made clear.

How does the Centrifugal pump work？

The main working parts of a centrifugal pump are the impeller and the casing. The impeller equipment inside the casing is located on the shaft and connects with the prime mover to form a whole. When the prime mover drives the impeller to rotate, the blades in the impeller force the fluid to rotate, that is, the blade does work on the fluid along its direction of movement, and then forces the pressure potential energy and kinetic energy of the fluid to be added. At the same time, under the effect of inertial force, the fluid flows from the center to the margin of the impeller, flows out of the impeller at a high speed, enters the extrusion chamber, and is discharged through the dispersion pipe. This process is called the pressure water process. Together, because the fluid in the center of the impeller flows to the margin, a low-pressure region is formed in the center of the impeller. When it has a satisfactory vacuum, the fluid enters the impeller through the suction chamber under the effect of the pressure at the suction end (usually atmospheric pressure). This process is called the Water absorption process. Because the impeller rotates in succession, the fluid is continuously discharged and sucked in, which constitutes a continuous operation.

The working process of centrifugal pumps (including submersible slurry pumps) is actually a process of energy transfer and conversion. It transfers the mechanical energy of the motor at high speed through the blades of the pump and converts it into pressure energy and kinetic energy of the pumped fluid.

These pumps are considered multi-level centrifugal pumps operating in the vertical position. Fluids that are augmented by impeller will drop off their kinetic energy in the diffuser and here the conversion of kinetic energy to pressure happens. This is the fundamental principle of both mixed flow and radial pumps. Whereas in the hydraulic submersible pumps, the motor is of hydraulic type other than the electric ones and in the case of closed-cycle the power liquid is kept isolated from the generated liquid. And in the open cycle, there will be a mixing of the generated fluid and the power fluid with that of surface isolation.

The shaft of the pump is connected either to the protector or gas separator through mechanical coupling at the pump bottom side. The liquid moves into the pump via the ingesting screen and is then elevated by the pump levels. The other components consist of bushings that are located all across the shaft length thus offering radial assistance to the shaft. In most cases, a thrust bearing handles a portion of the axial forces that arise in the pump, but these forces are maximumly captivated through the protector’s thrust bearing. There even exist various types of screw kind submersible pumps, where there will be a steel screw that operates as a functioning component. This screw permits the pump to operate water even in extreme impurity conditions.

How to extend the service life of the submersible slurry pump？

The working environment of the submersible slurry pump determines its service life. Let the centrifugal pump manufacturer teach you how to use coups to extend its service life.

To deal with this problem, the debris and long fibers sucked by the submersible slurry pump must be cut and discharged, and then the sand and water will be driven out together. This not only prolongs the service life of the submersible slurry pump but also speeds up municipal engineering. Construction speed creates the conditions. There is also a stir-type electric pump, which works slightly differently from cutting. It is equipped with a homogenizing tissue attachment. When the water is pumped to the bottom layer, because the underwater sediment or sediment has reached a certain concentration ratio and is not uniform, the thick sand will be sucked and stuck without draining the water. This is the first You need to mix them evenly and dilute them into thin sand so that it won't damage the electric pump easily.

In addition, in order to maintain the balance of the axial force of the main impeller, a sub-impeller structure must be provided, which can reduce the pressure in the seal cavity and greatly increase the axial force of the electric pump and the life of the mechanical seal. The heat dissipation of the electric pump has always been a key issue in the service life of the electric pump. If the heat dissipation is not good, the temperature in the motor will rise, which will continuously increase the power of the motor, easily burn out the motor, and shorten the life of the pump. In order to deal with this problem, we choose an external circulation cooling system to enhance the heat dissipation function, which can ensure that the electric pump can work normally when the water surface is exposed. Regarding the discharge of severe corrosive liquids, a stainless electric pump can be used first. Its corrosion resistance and operating reliability will be greatly improved.

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