Working principle of submerged long shaft pump and slurry pump
The slurry pump belongs to a centrifugal pump, which is divided based on the working principle of the pump.
The slurry pump belongs to a centrifugal pump, which is divided based on the working principle of the pump. The slurry pump achieves the process of conveying medium and boosting pressure through the action of centrifugal force. In addition, there are common types including screw principle, plunger principle, etc. that can be divided into pumps different from centrifugal principle. After discussing the concept of centrifugal pumps, let's talk about slurry pumps. Slurry pumps are classified from another perspective, that is, from the perspective of conveying media. As the name suggests, the slurry pump transports a mixture of solid particles containing slag and water. But in principle, the slurry pump belongs to a type of centrifugal pump. This will clarify these two concepts.
The main working components of a centrifugal pump are the impeller and casing, and the impeller device inside the casing is located on the shaft and connected to 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 blades do work on the fluid in its direction of motion, thereby increasing the pressure potential energy and kinetic energy of the fluid. At the same time, under the action of inertial force, the fluid flows from the center to the edge of the impeller, and exits the impeller at a high speed, enters the pressure chamber, and is then discharged through a diffusion tube. This process is called the water pressure process. At the same time, due to the flow of fluid at the center of the impeller towards the edge, a low-pressure zone is formed at the center of the impeller. When it has sufficient vacuum, under the pressure at the suction end (usually atmospheric pressure), the fluid enters the impeller through the suction chamber, which is called the suction process. Due to the continuous rotation of the impeller, the fluid is continuously discharged and sucked in, forming a continuous operation.
The working process of centrifugal pumps (including slurry pumps) is actually a process of energy transfer and conversion. It transfers the mechanical energy generated by the high-speed rotation of the electric motor through the blades of the pump and converts it into the pressure and kinetic energy of the fluid being pumped.
Before starting the underwater slurry pump, the pump inlet valve should be opened and the pump outlet valve should be closed. Then start the pump, and slowly open the pump outlet valve after the pump is started. The opening size and speed of the pump outlet valve should be controlled by ensuring that the pump does not vibrate and the motor does not exceed the rated current.
Starting with a pump in series also follows the above method. After starting the first stage pump, you can open the outlet valve of the final stage pump a bit (the appropriate opening size should be 1/4 of the rated current of the first stage pump motor), and then start the second and third stages successively until the final stage pump. After all the series pumps are started, you can gradually open the outlet valve of the final stage pump. The speed of valve opening should be controlled by the pump not vibrating and the motor of any stage pump not exceeding the rated current.
The main purpose of the submerged slurry pump is to transport flow, and it is best to install a flow meter (meter) in the operation monitoring system to monitor whether the flow meets the requirements at any time; In systems equipped with cyclone pipelines, slag flushing systems, and pressure filtration dehydration systems, a certain pressure is also required at the outlet of the pipeline. A pressure gauge should also be installed in this system to monitor whether the pressure meets the requirements.
During the operation of the submerged slurry pump, in addition to monitoring the flow and pressure, it is also necessary to monitor the motor not to exceed the rated current of the motor. Monitor oil seals, bearings, etc. at any time for any abnormal phenomena, and check if the pump has been emptied or overflowed, and handle them at any time.