Pump mechanical seal repair process has the following aspects: First, the mechanical seal cleaning and inspection Mechanical seal the working principle requires mechanical seal without any impurities inside. Clean the moving ring, stationary ring, bushings and other components thoroughly before assembling the mechanical seal. Key checks: 1, static and dynamic ring surface scratches, cracks and other defects, the existence of these defects will cause a serious mechanical seal leakage. Conditions can be special tools to check the sealing surface is flat, the sealing surface is not smooth, the pressure water will enter the mechanical and electrical seal assembly seal ring, the static and dynamic separation ring, mechanical seal failure. When necessary, tooling can be made before assembly water pressure test. 2, check the ring seat there is a defect affecting the seal. Such as the static and dynamic ring seat ring with static and dynamic sealing ring with scars and other defects. 3, check the mechanical seal compensation spring damage and deformation, whether the stubborn coefficient changes. 4, check the seal sleeve for burr, groove marks and other defects. 5, cleaning check all sealing ring cracks, pores and other defects, measuring the diameter of the rubber ring is within the tolerance. 6, with a mechanical seal pumping mechanism also check the spiral of the screw pump for cracks, broken lines and other defects. Second, the mechanical seal assembly technology Check the size of the mechanical seal overhaul process is more complex, to ensure that no leakage after the assembly of the mechanical seal, mechanical seal technical size of the essential check. 1, measuring moving ring, stationary ring sealing surface size. This data is used to verify the radial width of the static and dynamic rings. When using different friction materials, the radial width of the friction surface of the hard material should be 1-3mm larger than the soft one. Otherwise, the corner of the hard material end face may easily be embedded in the soft material Face up. 2, check the moving ring, stationary ring and the shaft or sleeve gap, the static diameter of the ring is generally larger than the shaft diameter 1-2mm, for moving ring, in order to ensure the floating, the diameter larger than the shaft diameter 0.5-1mm, to compensate Shaft vibration and deflection, but the gap can not be too large, otherwise it will move the ring ring stuck into the mechanical seal caused by damage. 3, check the mechanical seal tightness. We usually talk about the mechanical seal is the end pressure, end pressure than the appropriate, too large, the mechanical seal friction surface will heat to accelerate the wear of the end surface, increase the friction power; too small, easy to leak. The end face specific pressure is determined during mechanical seal design and can be determined by measuring the mechanical seal tightness during assembly. The usual measurement method is to measure the vertical distance from the installed static ring end surface to the gland end surface and the vertical distance between the end surface of the moving ring and the gland end surface. The difference between the two is the mechanical seal force. 4, measuring the length of the compensation spring changes. Changes in spring performance will directly affect the mechanical seal face than the pressure. Under normal circumstances, the length of the spring will be shortened after a long period of operation, and the mechanical seal of the compensating spring on the moving ring will be deformed due to the centrifugal force. 5, measuring the length of anti-static pins and pin hole depth to prevent the pin is too long static ring can not be assembled in place. This condition can damage the mechanical seal. three. Mechanical seal assembly after cleaning inspection, the technical size of the mechanical seal can be checked back after the installation, in this process should pay attention to the following points: 1, assembly of all seals due to the soap coated with lubricant, so you can Avoid damaging the apron during assembly. Static and dynamic ring between the sealing surface coated with grease to prevent static and dynamic ring sealing surface wear in the pump before driving. 2, floating ring assembly, be careful not to knock down the floating ring spring, so as not to affect the floating ring floating spring floating performance. Floating ring assembly, you can gently press the floating ring to determine whether there is a good floating performance. 3, the installation seal should be gently, to prevent damage to the seal, the seal should be installed and the cavity scrub clean. 4, Tighten the mechanical seal gland bolts should be uniform force to prevent uneven mechanical damage under pressure seal. For quick-mounted mechanical seals in the overall assembly must not forget the positioning of the radial path of movement away from the axis of the fixed position. Pump mechanical seal assembly in accordance with the above three steps, the assembly can be achieved without leakage of mechanical seals and other problems. However, the mechanical seal repair process should be to do a specific problem analysis, should be sealed for the mechanical seal is different medium, cold water and hot water temperature is different, the sealing medium is corrosive, the pressure within the chamber, the mechanical Seal design will be different, maintenance process will be different, which requires our flexible work in the maintenance work, the only way to ensure the quality of maintenance. The mechanical seal inspection process summed up the experience expressed as follows: Mechanical seal to be assembled, cleaning check forget. Look at the first look after the two rings, scars and cracks do not leak. Finally look at the rubber ring, stomatal diameter to see. Need to measure a variety of sizes, two ring gap to be adjusted. Tightness must be checked, a small spring is the key. Bolt force should be uniform, gently take a good habit.
Physical weighing is divided into Moisture Meter and Analytical Balance.
Physical Weighing,Digital Analytic Scale,Analytical Weighing Scale,Precision Water Moisture Meter
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