Four fluorine centrifugal pump mechanical seal to choose main point is introduced

Four fluorine centrifugal pump is using fluorine plastic material, will be corrosion resistance good a corrosion-resistant centrifugal pump, ptfe sealing conditions of centrifugal pump mechanical seal is an important part of the mechanical seal types are various, how to choose the suitable four fluorine centrifugal water pump mechanical seal is very critical, not only can ensure the sealing effect, also can prolong the service life of mechanical seal. Mechanical seal is the use of two surfaces friction between the principle of operation, to achieve the purpose of sealing. Rotating seal face installed in the pump shaft, the fixed seal face installed in the gland. Due to a sealing surface is in motion, and the other a sealing surface is stationary, so will the class is called dynamic sealing seal. Four fluorine centrifugal pump in normal operation, between the sealing surface of revolution and stationary surface because of the stuffing box pressure produced by liquid and keep it in a sealed condition, when starting and stopping, stuffing box pressure produced by spring pressure to maintain, Can even by spring pressure to replace) 。 Most of the design of the mechanical seal with soft materials to make the surface of revolution, the rotating friction on the surface of the harder still. Over the years, the combination of the most common is the use of carbon materials as a surface of revolution, to make it run on the surface of the ceramic stationary. This kind of material is still in common use, but still face is select stainless steel or more rigid materials, such as tungsten carbide and silicon carbide. No matter use what material, in a word between the contact surface must be kept in a layer of liquid membrane, in order to play the role of lubrication. However, in the packing box, use the spring load and the way of the combination of liquid pressure, can have very good sealing effect between the sealing surface. But sealing pressure is too high, will affect the interface formed between the liquid membrane, increase heat and premature wear and tear. If sealing pressure is too low, contact surface between the gap increases, easy to cause liquid leakage. Four fluorine centrifugal water pump seal the choice of the main shaft axial and radial motion to maintain flexibility with spring, to ensure the sealing between the contact surface. However, can only provide a certain degree of flexibility. mechanical condition and its length diameter ratio ( A spindle diameter and the ratio of the extension length measure, the lower the ratio, the better) The sealing reliability plays an important role ( The public number: pump pipe home) 。 Seal the flexibility of general by a large main spring and a series of small spring or corrugated ensure sealing device. Chemical industry adopted by the traditional seal design, its sealing pressure is applied to rotary surface, this seal is called rotating seal, because the spring or corrugated sealing device with the spindle rotation. Is new design, its spring or corrugated sealing device installed on stationary base.
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