The suction tube and pump must be filled with liquid before the pump is turned on. After the pump is turned on, the impeller rotates at a high speed, and the liquid rotates with the blade. Under the action of the centrifugal force, it flies outward from the impeller, and the liquid that is ejected gradually slows down in the pump chamber, the pressure gradually increases, and then the pump At the exit, the discharge pipe flows out. At this point, at the center of the blade, the liquid is drawn to the surroundings to form a vacuum low-pressure zone with neither air nor liquid. The liquid in the liquid pool flows into the pump through the suction pipe under the action of the atmospheric pressure of the pool surface, and the liquid is continuous. It is continuously sucked from the liquid pool and continuously flows out from the discharge pipe.
The chemical pump seal forms mainly include: oil seal seal, gasket seal, thread seal, labyrinth seal, packing seal and dynamic seal, mechanical seal.
First, the oil seal
It is a self-tightening lip seal. It has a simple structure, small size, low cost, convenient maintenance and low resistance torque. It can prevent media leakage and prevent external dust and other harmful substances from invading. A certain compensation capacity, but not high pressure, so it is generally used in chemical pumps on low pressure occasions.
Second, the gasket seal
The gasket is the basic component of the centrifugal pump static seal and is used in a wide range of applications. The selection of gaskets is mainly determined by factors such as the transport medium, temperature, pressure and corrosivity of the chemical pump.
Third, the thread seal
There are generally two forms on chemical pumps, one is a threaded joint gasket seal, and the other is a threaded and filled seal, both of which are used for sealing of small diameter threaded joints. The seal of the threaded electric diaphragm pump gasket is a gasket, and the thread only serves to provide a pressing force.
Fourth, the labyrinth seal
The maze sealing effect is very good when the design is reasonable, the processing is excellent, the assembly is good, and the rotation speed is high. However, in practical applications, the resulting chemical pump leaks a lot, so it is not commonly used in chemical pump seals.
Five, packing seal
The filler with compressibility and resilience is placed in the stuffing box, and the axial pressing force of the gland is converted into a radial sealing force, thereby sealing.
This method of sealing is called a packing seal and this packing is called a packing. Because the packing sealing structure is simple in form, convenient to replace, low in price, suitable for speed, pressure and wide medium, it is widely used in the design of chemical pumps.
Sixth, dynamic seal
When the chemical pump is in operation, the pressure head generated by the auxiliary impeller balances the high pressure liquid at the outlet of the main impeller to achieve sealing. When parking, the auxiliary impeller does not work, so it is necessary to have a parking seal at the same time to solve the chemical pump leakage that may occur when parking.
The auxiliary impeller has a simple sealing structure, reliable sealing and long service life. The drip water can be prevented from leaking during the operation of the chemical pump, so it is often used in pumps that transport contaminated media with chemical pumps.
Seven, mechanical seal
Nowadays, the chemical pump industry is the most widely used sealing form. Because mechanical seals have the advantages of less leakage and long life, mechanical seals in the world are the most important shaft sealing methods in these equipments. Mechanical seals, also known as end seals, are defined in the relevant national standards: "The at least one pair of end faces perpendicular to the axis of rotation are held together by the action of the fluid pressure and the compensating mechanism's spring force (or magnetic force) and the auxiliary seal. a device that prevents fluid leakage by sliding relative to each other."
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