For many years energy efficiency has been the number one topic with manufacturers and users of vacuum furnaces for thermal treatment. The search for energy saving possibilities concentrated here mainly on the furnaces themselves and the optimization of the heat-treatment processes. Furnace designs and operating conditions were established and optimized long ago. Measures for heat recovery and other concepts to reduce energy consumption were clearly gained. However, with the new digital age upon us, further investigation into energy savings possibilities should again be explored. The vacuum system, as part of the furnace, was often neglected in those efforts to reduce power consumption. Despite this, the vacuum pump manufacturers worked diligently on the improvement of the energy efficiency for their products. For example, modern screw vacuum pumps have been developed with a focus to reduce their energy consumption down to the level of longstanding oil-sealed rotary-vane or rotary-piston vacuum pumps. Improvements in enhanced robustness along with a marked reduction in maintenance costs were also attainable. Also, next generation roots-pumps utilize modern built-in motor concepts to improve leak tightness, minimize power consumption and reduce parts wear.
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