Asphalt pump sealing technology
Asphalt pump sealing device technology is the key technology to ensure that asphalt pumps can effectively prevent leakage when conveying high-temperature and high-viscosity asphalt. The following is a detailed analysis of asphalt pump sealing device technology:
1. Sealing principle
The sealing device of the asphalt pump mainly relies on mechanical seals, which are devices that achieve sealing through sliding end faces perpendicular to the shaft under the action of fluid pressure and the elastic force (or magnetic force) of the compensation mechanism. The mechanical seal maintains fit through the relatively sliding end faces with the cooperation of the auxiliary seal to prevent medium leakage.
2. Sealing material selection
The selection of sealing materials is crucial to the sealing effect of the asphalt pump. According to different working conditions, such as medium temperature, pressure, corrosiveness and other factors, different materials of sealing materials need to be selected. Common sealing materials include rubber, graphite, polytetrafluoroethylene, tungsten carbide, cemented carbide, etc. These materials usually have good mechanical strength, hardness, compressibility, corrosion resistance and aging resistance.
In high temperature environments, such as when the asphalt conveyed by the asphalt pump has a high temperature, it is necessary to select high temperature resistant sealing materials, such as tungsten carbide, cemented carbide, etc. These materials can maintain stable performance at high temperatures to ensure the sealing effect.
3. Sealing structure
The sealing structure of asphalt pumps usually includes single-end mechanical seals and double-end mechanical seals. Single-end mechanical seals are suitable for general working conditions and have the advantages of simple structure and easy installation. Double-end mechanical seals are suitable for more demanding working conditions, such as high temperature, high pressure, easy crystallization and other media environments. Double-end mechanical seals can more effectively prevent media leakage through the interaction of two sealing surfaces.
4. Installation and maintenance of sealing devices
Installation precautions:
The radial runout and axial movement of the equipment shaft should be strictly controlled to ensure the fit of the sealing surface.
The sealing part should be kept clean during installation to prevent impurities and dust from entering the sealing part.
The installation process should be gentle and avoid collisions and knocks to avoid damage to the sealing components.
After installation, ensure that the dynamic ring can move flexibly on the shaft and check whether there is a significant weight difference.
Maintenance points:
Regularly check the leakage of the sealing device, and if there is leakage, it should be handled in time.
Regularly check the wear of the sealing material, and replace it in time if it is severely worn.
For media that are easy to crystallize or contain particles, flushing, filtering and cooling measures must be taken to prevent crystals or particles from wearing the sealing surface.
5. Technical Improvement and Innovation
With the advancement of technology and the development of engineering practice, the technology of asphalt pump sealing devices is also constantly innovating and improving. For example, new sealing materials are used, the sealing structure is optimized, and automatic control systems are introduced to improve the sealing performance and operating reliability of asphalt pumps.
