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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