Fluorine plastic centrifugal pump is conveying acid, alkali, corrosion of solvent commonly used centrifugal pump, fluorine plastic centrifugal pump seal usually adopts mechanical seal, mechanical seal centrifugal pump is one of the main parts, thus is the cause of most of pump failure caused by seal failure.
Mechanical seal failure cause of pump failure accounted for more than 50% of the equipment failure rate, so it is necessary to understand working principle of the centrifugal water pump
mechanical seal, in order to reduce the failure rate of the pump.
One, the principle of mechanical seal mechanical seal is a kind of relying on the elastic element of dynamic and static ring end face seal preloaded and medium pressure and the elastic element of pressure and seal axial end face sealing device.
Mechanical seals are usually made of static ring, ring, compaction of components and packing element.
Ring and static ring end face of a pair of friction pair, ring by liquid pressure in the sealed chamber to make the end face pressure on the static ring end face, and on the two ring end face produced a suitable pressure and keep a very thin layer of liquid membrane and reach the purpose of sealing.
Compression components create pressure, can make the pump in not running condition, also keep the transverse joint, nothing more than to ensure sealing medium leakage, and to prevent debris from getting into the seals.
Seal up the clearance between the axis and seal ring and static ring and the clearance between the gland function, at the same time, the pump vibration and impact buffer role.
Mechanical seal in the actual operation is not an isolated parts, it is combined with other parts of the pump running.
Second, the working principle of the centrifugal pump and mechanical seal device of centrifugal pump with motor, coupling, make its high-speed rotating impeller, liquid between blade driven by the blade, under the action of centrifugal force, and continuously from the centre was thrown around, when the liquid in the pump impeller center was put to the edge, the center has formed the low pressure area, because before entering the pump at the entrance of liquid pressure is greater than the water pump suction pressure, under the action of pressure difference, the liquid and the suction pipe continuously, in the suction pump to supplement the discharged liquid position, as long as constantly rotating impeller, liquid suction and discharge.
shaft through the pump shell, there is a gap between movement, the fluid will leak from the gap in the water pump to the pump, if the suction side is vacuum, the outside air leakage into the pump, the serious influence of pump work, in order to reduce the leakage, generally in the dynamic and static clearance is equipped with shaft end sealing device.
Shaft sealing device is an important part of a centrifugal pump, it is directly related to the centrifugal pump can work normally.
Now generally adopts mechanical seal shaft sealing device.
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