Before the pump is opened, the suction pipe and the pump must be filled with liquid. After the pump is opened, the impeller rotates at high speed. The liquid moves along with the blades. Under the action of centrifugal force, the impeller flies outward, and the liquid ejected slowly slows down in the diffuser of the pump housing, and the pressure gradually increases. Then it flows out from the pump outlet and the discharge pipe. At this time, in the leaves at the center of the vacuum area of low pressure liquid was thrown to the surrounding formation there is no air and no liquid, liquid pool at the surface of the liquid under the action of atmospheric pressure, through the suction pipe into the pump, the liquid is continuously pumped up from the liquid pool is also continuously from the outflow discharge tube. Stainless steel chemical pump

The main sealing forms of chemical pump include oil seal seal, gasket seal, thread seal, labyrinth seal, packing seal, power seal and mechanical seal.

One, seal oil seal

Is a kind of self tight seal lip shape, which has the advantages of simple structure, small size, low cost, convenient maintenance, resistance torque is small, which can prevent the leakage of medium, can also prevent external dust and other harmful substances invasion, and compensation ability to wear, but not high pressure, so generally used in low pressure on the occasion of chemical pump.

Two. Gasket seal

The gasket is the basic element of the static seal of the centrifugal pump, and its scope of use is very wide. The type selection of the gasket is mainly determined by the medium, temperature, pressure and corrosiveness of the chemical pump.

Three, thread seal

There are two forms in chemical pumps, one is threaded connection gasket seal, one is thread plus filling seal, the other two are used for sealing small diameter threaded connection. The sealing piece of the threaded diaphragm pump is sealed by the gasket is a gasket, and the thread only serves as a pressing force.

Four, labyrinth seal

The labyrinth sealing effect is very good when the design is reasonable, the processing is fine, the assembly is perfect and the speed is high. But in practical application, the chemical pump leakage is very much, so it is not commonly used in the chemical pump seal.

Five. Packing seal

It is to put the compressing and resilient packing into the packing box, and to rely on the axial compression force of the cap into the radial seal force, so as to play the sealing effect.

This sealing method is called a packing seal, which is called a sealed packing. Because of its simple structure, convenient replacement, low price, speed, pressure and wide media, packing seal is widely used in chemical pump design. Six. Dynamic seal

During the operation of the chemical pump, the pressure head produced by the auxiliary impeller balances the high pressure liquid at the outlet of the main impeller to realize the seal. When parking, the auxiliary impeller does not play a role, so it must be equipped with a parking seal at the same time to solve the chemical pump leakage that may occur when parking.

Vice impeller seal has the advantages of simple structure, reliable sealing, long service life, can be realized leak of chemical pump operation, so it is often used in the chemical pump conveying medium impurity pump.

Seven. Mechanical seal

Chemical pump industry is currently the most widely used form of sealing. Because mechanical seals have many advantages, such as less leakage and long life, mechanical seals are the main shaft seal methods in these days. The mechanical seal is also called the seal, in the relevant national standard is defined as: “ by at least a pair of end faces perpendicular to the axis of rotation of the fluid pressure and the elasticity of compensation organizations (or magnetic) device to prevent fluid leakage sticking and sliding relatively the retention and coordination of auxiliary seals. ”

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