EagleBurgmann international
EagleBurgmann WORLDWIDE
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EagleBurgmann Espey
Mixer
Agitators primarily find application in the food and pharmaceutical industries, as well as in the chemical sector. Agitators are usually closed off by compression packings or mechanical seals. Special seal solutions are needed if highly viscous media generate large radial deflections of the shaft, or when the temperatures in the seal area are high. Espey® carbon floating ring seals from EagleBurgmann Espey have been designed to cope with large radial shaft deflections, endless axial movements in implementations without bearings, and also for temperatures well above 500 °C (932 °F) (without additional cooling facilities). They meet a large number of requirements, such as compatibility with foods and robustness, and have been used for years in numerous applications.
Application example: Sealing of a mixer in the herbicide production
Issue and challenge:
Chlorine, in the form of chlorates, is the basic material for the manufacture of herbicides. The material is dampened with water and mixed with other chemicals appropriate for the final application to prepare it for further processing. This is done under a vacuum using a two-shaft paddle mixer with screws rotating in opposite senses. In order to seal the shaft at the mixer housing, the operator required a seal with a shaft sleeve to protect the paddle shafts. It would have to keep the dusts and the chlorine gases generated in the process within the mixer housing, and its function would have to remain unimpaired by the presence of the powder.
Solution from EagleBurgmann Espey:
The Espey solution for the 2-shaft paddle mixer is a combined Espey® WD200/500 with a connection for barrier gas and three seal rings. Its split housing permits assembly without dismantling the drive motors and is designed for a temperature of 94 °C (201.2 °F), vacuum, and a rotation speed of 30 rpm. Dry air is used as the barrier medium; adequate quantities are available without additional supply equipment. The dust present at the seals inside the mixer is kept away from the sealing region by slip rings. Because the shafts of the paddle mixer do not have suitable wear protection, Espey designed a two-piece shaft sleeve with a suitable coating to protect the shaft. The seal solution has a long service life, is maintenance-free, and compensates for shaft movements.
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