1, mechanical seal repair in several errors
The larger the spring compression, the better the sealing effect. In actual fact, the spring compression is too large, can lead to rapid wear and tear friction, instantaneous burning; excessive compression of the spring lost the ability to adjust the dynamic ring end face, leading to seal failure.
Ring seal ring as tight as possible. In fact, the ring is too tight moving ring harmless. One is to exacerbate the wear and tear between the seal ring and the sleeve, premature leakage; the other is to increase the axial resistance of the moving ring, the resistance to movement, can not be adjusted in time when the working conditions change frequently; thirdly, Is to move the ring ring deformation, affecting the sealing effect.
Static ring seal as tight as possible. Static ring seal is basically static, the relatively tight seal will be better, but too tight is also harmful. First, the static ring seal caused by over-deformation, affecting the sealing effect; Second, if the static ring material is graphite, generally more brittle, too easily lead to fragmentation caused by excessive force; Third, the installation and removal difficulties, can easily damage the static ring.
Impeller lock mother tighter and better. Mechanical seal leakage, the sleeve and shaft leakage (shaft leakage) is more common. Generally believed that the leakage between the shaft impeller lock is not locked, in fact, leading to leakage between the shaft more factors, such as the shaft pad failure, offset, impurities within the shaft, shaft and sleeve with a larger shape Bit error, contact surface damage, there is a gap between the various components on the shaft, the shaft thread is too long and so will lead to shaft leakage. Lock over lock only lead to premature failure of the shaft pad, on the contrary, lock the lock body, so that the shaft pad always maintain a certain degree of compression flexibility, in operation, the lock will automatically lock in time, the shaft is always in good Sealed state.
New better than the old. Relatively speaking, the use of new mechanical seal effect is better than the old, but the new mechanical seal quality or material selection is not appropriate, with the larger size error will affect the sealing effect; In polymeric and permeability medium, the static ring without excessive Wear, or not replaced as well. Because the static ring in the static ring seat for a long time in a quiescent state, the polymer and impurities deposited as one, played a better seal.
2. In addition to using the pump in strict accordance with the installation instructions, should also pay attention to two points:
First, avoid by "experience." Such as the pump valve leakage in the emergence of some machine plans to save trouble, before each boot, fill the inlet pipe to fill some dry soil, and then rushed to the soil rushed to the end of the valve so that the end of the valve watertight. This method looks easy, but not enough. Because when the pump starts to work, the bottom valve of the sand will be with the water into the pump, wear impeller, pump housing and shaft, seriously affecting the service life, the correct method should be overhaul the bottom valve, it can not be repaired ,replace. Second, find out the fault should be promptly eliminated, should not allow the crew "sick" work. For example, found that the pump shaft packing wear serious, to increase the filler, otherwise it will make the pump shaft packing leak. Pump shaft packing leaks not only make the unit energy consumption is too large, and cavitation will occur to speed up the damage to the impeller, a direct impact on pump life. As another example, found that the pump vibration, should immediately stop checking, or if the pump is likely to be bent and deformed safety accidents.
3. Pump units and piping in use for a period of time, should be well pump maintenance work.
(1) Exhaust water pump and the remaining water in the pipeline.
(2) If the disassembly is convenient, the pump and pipeline can be removed and cleaned.
(3) Check the ball bearings, such as jacket wear, Kuang, ball wear or the surface of the spots have to be replaced. Can still be used to clean the bearings with gasoline or kerosene butter preserved.
(4) Inspect the impeller for any cracks or small holes, and if the impeller is loose, repair or replace if damaged. Check the impeller wear ring gap, if more than the specified value, should be repaired or replaced.
(5) If both the pump and the pipe are not to be disassembled, cover the exit with a cover to prevent debris from entering.
(6) When the transmission tape is not used, the tape should be removed, washed with warm water, dried and stored in the place without direct sunlight, nor stored in places with oil, corrosives and smoke. In any case, do not allow the tape to be stained with oil, diesel or gasoline, and do not apply rosin and other sticky substances to the tape. Before use, remove the white powder from the contact surface of the tape.
(7) Scrub all screws and bolts with steel wire brush, apply oil or dip in diesel oil.
In short, in addition to strictly in accordance with the instructions to use, but also should be good pump maintenance and repair work, so as to extend the service life of the pump.
4. How long the pump bearing grease needs replacement
For bearings, lubrication is an important issue around its performance. The appropriate lubricant or lubrication method will greatly affect the bearing life. If the bearings are made of high-grade grease in normal operating conditions can run 15,000 hours or two years. For motor power greater than 18.5KW pump or in unfavorable conditions such as high ambient temperature, air humidity, dust, and aggressive industrial environment should be checked in advance bearings, if necessary, can arrange 5000 hours to replace the grease. The amount of grease filling varies with the structure and volume of the housing, which is generally 1 / 3-1 / 2 filled to the volume. When the filling amount is too much, the grease will deteriorate, age and soften due to stirring and heating.
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