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diaphragm seal are used in many purposes inside pump, chemical, pharmaceutical, process and safety industries. They are sometimes used with the purpose of reducing put on, sealing of liquids from the surroundings, cleanliness wants or as a security issue to brake over if torque all of a sudden rises.
The commonest magnetic couplings are made with an outer and inside drive, both build up with Neodymium magnets so as to get the best torque density as attainable. By optimizing the diameter, air hole, magnet measurement, number of poles and choice of magnet grade, it is possible to design a magnetic coupling that fits any software within the vary from few millinewton meter as a lot as a quantity of hundred newton meters.
When solely optimizing for เพรสเชอร์เกจ , the designers typically are likely to forget contemplating the influence of temperature. If the designer refers again to the Curie point of the person magnets, he’ll claim that a Neodymium magnet would fulfill the requirements up to more than 300°C. Concurrently, you will need to include the temperature dependencies on the remanence, which is seen as a reversible loss – typically around 0,11% per degree Celsius the temperature rises.
Furthermore, a neodymium magnet is underneath strain during operation of the magnetic coupling. This signifies that irreversible demagnetization will happen long before the Curie point has been reached, which usually limits using Neodymium-based magnetic coupling to temperatures below 150°C.
If larger temperatures are required, magnetic couplings made of Samarium Cobalt magnets (SmCo) are typically used. SmCo just isn’t as strong as Neodymium magnets however can work up to 350°C. Furthermore, the temperature coefficient of SmCo is just 0,04% per diploma Celsius which means that it can be used in applications where efficiency stability is required over a bigger temperature interval.
New technology In collaboration with Copenhagen Atomics, Alfa Laval, Aalborg CSP and the Technical University of Denmark a new technology of magnetic couplings has been developed by Sintex with support from the Danish Innovation Foundation.
The purpose of the venture was to develop a magnetic coupling that might increase the working temperature space to achieve temperatures of molten salts round 600°C. By exchanging the internal drive with a magnetic materials containing the next Curie point and boosting the magnetic subject of the outer drive with special magnetic designs; it was potential to develop a magnetic coupling that began at a lower torque level at room temperature, but solely had a minor discount in torque stage as a operate of temperature. This resulted in superior efficiency above 160°C, irrespective of if the benchmark was against a Neodymium- or Samarium Cobalt-based system. This could be seen in Figure 1, the place it is shown that the torque stage of the High Hot drives has been examined as a lot as 590°C on the inside drive and still carried out with an almost linear discount in torque.
The graph additionally reveals that the temperature coefficient of the High Hot coupling is even lower than for the SmCo-system, which opens a decrease temperature market the place performance stability is important over a larger temperature interval.
Conclusion At Sintex, the R&D division remains to be developing on the know-how, however they must be challenged on torque stage at either completely different temperature, dimensions of the magnetic coupling or new functions that haven’t previously been attainable with commonplace magnetic couplings, so as to harvest the full potential of the High Hot know-how.
The High Hot coupling is not seen as a standardized shelf product, however as a substitute as custom-built by which is optimized for particular purposes. Therefore, additional growth will be made in shut collaboration with new partners.
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