Mechanical Seal Maintenance Process
As technology advances, new materials, rotating machinery has generally used mechanical
seal shaft sealing device, sealed as in power and chemical industries. Mechanical seal is relative to the packing seal leakage, long life, without the advantages of small power consumption, but also have its structure is relatively complex, repair technology request higher shortcomings, it is proposed to overhaul the higher requirement.
We were limited, rotating machinery technology level, especially the pump widely adopted packing seal. In the operation of pump shaft seal leakage often appear, especially hot water pump, such as water pump, 4 # steam incremented pump, serious when forced to stop leakage, serious impact on the safe and stable operation of the unit. By constantly exploring, pump class # 1 unit successfully on the mechanical seal of the pump, and the reconstruction work in process has accumulated rich experience in maintenance and overhaul of mechanical seal.
To master mechanical seal maintenance and maintenance, first, we need to know the working principle of mechanical seal. Mechanical seal is by two perpendicular to the axis of the sealing element, smooth and flat surface, and each joint of relative rotation and sealing device. It is by the pressure of the service medium in rotating sealing ring of the static contact surface of compound in appropriate clamping force, the two end closely, maintain a layer between the end of liquid membrane and achieve the goal sealed. This layer of liquid membrane with liquid dynamic pressure and static pressure lubrication, plays and balance of forces. Mechanical seal of the pump repair technology mainly in the following aspects:
A clean and mechanical seal. The check
The working principle of mechanical seal requirements without any impurities inside the mechanical seal. The mechanical seal to thoroughly clean, static, dynamic ring sleeves. Key inspection:
1 and movement rings surface crack exists scratches, such flaws that can cause severe mechanical seal of the existing leakage. Conditional can use special tool to check whether level off, sealing, pressure seal uneven water will enter assembly of mechanical seal ring after sealing ring, action, mechanical seal failure. When necessary, can make tooling in hydrostatic test before assembly.
2 and check whether there are static sealing ring block defect of influence. As static and dynamic ring gasket rings with surface defects such as whether there are wounds, our unit steam pump once due to the existence of similar static ring block defect and discharge.
3 and check whether mechanical seal of deformation and damage compensation spring, stubborn coefficient whether changes.
4, check the sealing collar exists burr, trench, etc.
5 and cleaning check all gasket existence defects such as cracks, porosity, whether in nominal diameter aprons range.
6 and pumping institution of mechanical seal of the helical screw pump well there is crack defects, break.
Ii. Mechanical seal assembly technology dimension
Mechanical seal maintenance process is relatively complex, to ensure the mechanical seal assembly without leakage, mechanical seal technology dimension of checking is indispensable.
1, measuring, static sealing ring fixed ring size. This data is used to verify the radial static ring width, elected by different friction friction materials, radial width should be more than the big soft 3mm - 1, otherwise easy cause unevenness of edges embedded hard soft materials of end up.
2, inspection, static and dynamic ring ring or collar, the clearance of the inner ring is usually better than static trunnion big 1-2mm, to ensure FuDongXing acting-ring trunnion big diameter, than 1mm 0.5 - to compensate for the shaft vibration and deflection, but the gap is too big, otherwise, it will not make acting-ring seal card into the mechanical seal function caused damage.
3 and the mechanical seal. We often speak of mechanical seal tightly force is also face pressure, the pressure must be appropriate, face, will make the mechanical seal face, the friction surface heat accelerated frictional wear, increase power, Too small, easy to discharge. Face pressure is in the design of mechanical seal, we determined only by measuring in the assembly to determine the force of mechanical seal. Usually the measurement method to measure static ring end installed to cover the vertical distance in the end, the measuring acting-ring face to face the vertical distance gland, both the difference of the pre-pressures are mechanical seal.
4 and measuring the length of spring compensation. Spring performance changes will directly influence the mechanical seal face pressure. Normally in the long run after spring, spring will shorten the length of the ring on the compensation of mechanical seal of the centrifugal force would cause deformation. Our 1 # unit to pump lead pump mechanical seal maintenance process had found compensation spring shorter caused by mechanical seal function drops.
5 and measurement of static loop turn against the length and pin pin pin hole depth, prevent static ring too long can assemble in place. This kind of situation will damage mechanical seal.
by: selina00123
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