Characteristics Of Several Commonly Used Centrifugal Pump Packing Seals

Dec 14, 2024

1. Carbon fiber filler

Carbon fiber sealing filler is a new type of sealing filler. The excellent self-lubricating performance, high and low temperature resistance, and chemical resistance of carbon fiber sealing fillers have attracted great attention. In addition, the elasticity and flexibility of carbon fiber sealing fillers as compression fillers are also extremely good. The disadvantage of carbon fiber sealing fillers is only that they have infiltration and leakage, but they can prevent them from being soaked in polytetrafluoroethylene or other adhesives. At present, the cost of carbon fiber sealing filler is relatively high, but with the development of carbon fiber, the cost of carbon fiber sealing filler will definitely decrease. Therefore, carbon fiber sealing filler is the most ideal and promising filler.

2. Metal fillers

There are two types of metal fillers: semi metal fillers and all metal fillers. Semimetallic fillers are composed of a combination of metal and non-metal materials; All metal fillers do not contain non metals. Among them, there is a type of metal tape wrapped filler, which uses asbestos rope as the core and the outer layer is made by spiral winding multiple layers of strip aluminum, lead, and tin foil. The surface of the metal foil is coated with lubricant, and the cross-section is square. This semi metallic filler has good thermal conductivity, wear resistance, stable friction performance, low friction coefficient, high mechanical strength, pressure resistance, and pressure fluctuations. The filler is made by winding a metal strip, and there is no leakage problem. The speed at the edge of the shaft can reach 20-25m/s. He is mainly used for boiler feedwater pumps.

3. Expanded graphite packing

Expanded graphite fillers belong to a branch of pure graphite fillers. It is a graphite product made from high-quality natural flake graphite as raw material, which undergoes chemical treatment, high-temperature instant heat treatment (expansion), and mechanical processing. After high-temperature treatment, the expanded graphite particles take on a worm like shape and can be molded into products using simple equipment. In addition to possessing all the excellent properties of graphite, it also has elasticity and compressibility, anisotropy, and low gas and liquid permeability, making it an ideal sealing material. Due to its soft performance, it is also known as "flexible graphite".

4. Nano level sealing filler

Nano level sealing packing is a new generation of sealing packing for industrial (water) pumps. Nano sealing filler is a layered (nano scale) shear (non-woven) material. This product has a delicate texture, smooth and soft texture, high tensile strength, and strong plasticity. It can be manually deformed, making it very suitable as a friction pair material and easy to install. It has two major characteristics: superplasticity and absorption capacity, excellent lubrication performance, long service life, easy installation and maintenance. Its excellent lubricity can effectively reduce the energy consumption of equipment; The ultra long service life and maintenance free can greatly save the production and maintenance costs of enterprises and reduce the labor intensity of workers. Choosing this product is an effective way for enterprises to achieve energy conservation, consumption reduction, and income increase.