The pump is shown in the process flow diagram:
The impeller is mounted in the pump casing and fastened to the pump shaft, which is directly driven by the motor. There is a liquid suction pipe in the center of the pump casing. Liquid enters the pump through the bottom valve and suction pipe. The liquid discharge outlet on the pump casing is connected with the discharge pipe.
Before the pump starts, the pump casing is filled with the liquid being conveyed; after starting, the impeller is driven by the shaft to rotate at high speed, and the liquid between the vanes must rotate with it. Under the action of centrifugal force, the liquid from the center of the impeller is thrown to the outer edge and gain energy to leave the outer edge of the impeller at a high speed into the worm-shaped pump casing.
In the snail shell, the liquid is decelerated due to the gradual expansion of the flow path, and part of the kinetic energy into static pressure energy, and finally flow into the discharge pipeline at a higher pressure, sent to the place of need.
Liquid from the impeller center to the outer edge of the flow, in the impeller center to form a certain vacuum, due to the reservoir above the liquid surface pressure is greater than the pressure of the pump inlet, the liquid will be pressed into the impeller continuously. It can be seen that as long as the impeller continues to rotate, the liquid will continue to be sucked in and discharged.
Linear pump working principle is different from any other pumps, is the use of magnetic levitation principle and spiral ring hydrodynamic structure to realize the fluid propulsion, that is, the abolition of the shaft, the abolition of the shaft connection, the abolition of the shaft sealing structure. After starting the current is converted into a magnetic field, the magnetic field force drives the spiral ring operation.
Extended information
In agricultural production, the pump is the main irrigation and drainage machinery. China's rural area is vast, every year rural areas need a large number of pumps, generally speaking, agricultural pumps accounted for more than half of the total output of pumps.
In the mining and metallurgical industries, the pump is also the most used equipment. Mines need to use pumps to drain water, in mineral processing, smelting and rolling process, need to use pumps to water supply, etc..
In the electric power sector, nuclear power plants need nuclear main pumps, secondary pumps, tertiary pumps, thermal power plants need a large number of boiler feed pumps, condensate pumps, oil and gas mixing pumps, circulating pumps and ash pumps.
In the national defense construction, aircraft flaps, rudder and landing gear adjustment, warships and tank turrets rotation, submarine sinking and floating, etc. need to use the pump. High-pressure and radioactive liquids, some also require the pump without any leakage and so on.
In short, whether it is an airplane, rockets, tanks, submarines, or drilling, mining, trains, ships, or daily life, everywhere you need to use the pump, everywhere there are pumps in operation. It is so, so the pump as a general-purpose machinery, it is a class of mechanical industry in the main products.
Baidu Encyclopedia - Pumps