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With the rapid development of China's industrial technology, the requirements for industrial pumps are becoming higher and higher, especially the sealing performance. The sealing of industrial pump plays an important role in the operation of all equipment. The leakage of sealing system of industrial pump will seriously affect the normal operation of equipment. Especially the development of high temperature and high pressure pump makes the sealing of pump more strict. Industrial pump selection this day to talk about the failure of packing seal measures taken.
1. Selection of filler material. When selecting fillers, we should pay attention to the following premises:
① There is enough plasticity under the gland pressure. Under the compression force, whether it can produce the necessary radial force and contact with the tight shaft can supplement all the loose holes and cracks, so as to block the leakage.
② It has enough chemical stability, does not stain the medium, the filler is not expanded by the medium, the filling impregnant is not dissolved by the medium, and is not eroded by the sealing liquid, gas and lubricating liquid.
③ There is room for automatic relaxation, wear resistance, small conflict coefficient, without damaging conflict and heat.
④ If there is a small deviation of the shaft, whether the packing has enough floating rotation; whether the production is simple and filling is convenient.
2. Add packing. When adding packing, the packing room must be cleaned and free of any impurities and dirt. Check the size of stuffing box and packing, and circle cut according to the size of pump shaft, which is not easy to be too short. When filling, sharp tools (such as screwdriver, wire, etc.) shall not be used to press the packing, so as to avoid the formation of holes in the packing and affect the sealing effect. During the filling and compaction process, the gland shall not be inclined, resulting in too tight compression of the packing near the gland section, and uniform force shall be used when tightening. After the packing is added, the packing is not easy to be added too tightly, and there should be a certain degree of looseness.