Commonly used centrifugal pump packing there are four kinds:
Carbon fiber filler
Carbon fiber packing is a new type of packing. Carbon fiber sealing filler excellent self-lubricating properties, high temperature resistance, low temperature performance and chemical resistance caused great attention, and carbon fiber sealing filler as a compression packing flexibility and flexibility is also very good, carbon fiber sealing filler only shortcomings Penetration leakage, but after intrusion Teflon or other adhesives can be prevented. At present, the cost of carbon fiber sealing packing is high, but with the development of carbon fiber, the cost of carbon fiber sealing packing is expected to decline. Therefore, carbon fiber packing is one of the most ideal and most promising packing materials.
Metal filler
Metal filler with semi-metallic filler and all-metal filler two. Semi-metallic fillers are made of a combination of metal and nonmetallics; all-metal fillers are non-metallic. One of the metal tape wound packing, he asbestos rope as the core, the outer band ribbon aluminum, lead, tin foil spiral multi-layer wound. Metal foil surface coated with lubricant, cross-section into a square. This semi-metallic filler has good thermal conductivity, wear resistance and stable friction properties, small friction coefficient, mechanical strength, pressure and pressure fluctuations. Filler is made of a metal tape wound, there is no leakage of leakage problems. Shaft speed up to 20 ~ 25m / s. He is mainly used for boiler feed pumps.
Expanded graphite packing
Expanded graphite packing belongs to a branch of pure graphite packing. It is made of high-quality natural flaky graphite as raw material, after chemical treatment, high temperature instantaneous heat treatment (expansion), and then by mechanical processing of graphite products. Expanded graphite particles after high temperature treatment are worm-like, and can be molded by simple equipment. In addition to all the fine qualities of graphite, it is also an ideal sealing material with elasticity and compressibility, anisotropy, low gas and liquid permeability. Because of its soft performance, also known as "flexible graphite."
Nanometer seal packing
Nanometer seal packing, is a new generation of industrial (water) pump seal packing. Nano sealing filler, layered (nano) shear (non-woven) material. The product is delicate in texture, smooth and soft, high in tensile strength and strong in plasticity. It can be plastic deformed by hand, which is very suitable for friction material and easy to install. It has superplasticity, two major characteristics of absorption, lubrication, good performance, long service life, easy installation and easy maintenance. Its excellent lubricity can effectively reduce the energy consumption of equipment; long service life and maintenance-free can greatly save the cost of production and maintenance of enterprises and reduce the labor intensity of staff. The use of the product is an effective way for enterprises to achieve energy saving, consumption reduction and revenue growth.
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