Magnetic-drive device for rotary machinery
AssigneeNKG Insulators, Ltd.
InventorsOsamu Kyo, Yasuo Akitsu
Life of this patent
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Abstract
A magnetic-drive device used for rotary machines, having a high torque transmitting efficiency, causing little temperature elevation of treated fluids and exhibiting mechanical strength and thermal shock resistance. The device comprises a chamber formed by combining a front casing with a rear casing to accommodate a rotor supporting a driven magnet. The rear casing consists of a cylindrical partition walled up at its one end with a bottom portion and provided with a flange portion on the other end, which partition having a thickness of 1.5-8 mm and consisting of a ceramic material having a specific resistance of at least 10.sup.7 .OMEGA.-cm. A driving magnet arranged outside the partition is magnetically coupled with the driven magnet through the partition.
Claims3
A magnetic-drive device for rotary machinery comprising:
- a driving motor and a rotatable motor driven by a magnetic coupling means including a driving magnet fixed on a magnetic holder connected with said driving motor and a driven impeller magnet fixed on a rotor of said rotatable motor, said driving magnet and the driven impeller magnet being combined with each other;
- and
- a chamber accomodating said rotatable motor and having a cylindrical partition defining the periphery of the chamber, said partition having a thickness of 1.5-8 mm and comprising a ceramic material having zirconia as a main ingredient, containing 1-5%, based on the weight of the main ingredient, of alumina (Al.sub.2 O.sub.3), silica (SiO.sub.2) and an alkaline metal oxide, and having a specific resistance of at least 10.sup.7.OMEGA. -cm, through which partition the driving magnet and the driven impeller magnet are magnetically coupled.
Dependencies are inferred from the claim text.