An actuator using magnetic forces to reduce frictional forces

F - Mech Eng,Light,Heat,Weapons – 16 – K

Patent

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F16K 31/06 (2006.01) F16K 3/10 (2006.01) F16K 31/08 (2006.01)

Patent

CA 2215242

An actuator for opening and closing a valve with less resistance. The actuator includes a rotor, a stator, a valve and a shaft. The shaft having a first and second end, and an axis extending longitudinally therethrough. The stator, having an electromagnet mounted thereon, and circumferentially mounted around the shaft that extends therethrough. The rotor, fixedly mounted circumferentially around the first end, and having a permanent magnet mounted adjacent to the electromagnet and spaced a first distance therefrom. The valve including a rotary valve and valve seat. The rotary valve, mounted circumferentially around and near the second end, having a valve opening therein. The valve seat, mounted adjacent the rotary valve, having a seat valve opening therein, and fixedly attached to the stator. There actuator is designed for axially moving the rotor from the first distance to a second greater distance from the stator and thereby moving the rotary valve further away from the valve seat, and then axially rotate the shaft to a second position that aligned the seat valve opening and the valve opening, and then moving the rotor from the second distance back to the first lesser distance.

Cette invention concerne un dispositif de commande de robinet à résistance réduite, comportant un rotor, un stator, un obturateur, un siège et une tige. Le stator, qui porte un électroaimant, est monté sur la tige. Le rotor, fixé par son centre à l'une des extrémités de la tige, comporte un aimant permanent faisant face à l'électroaimant, dont il est séparé par un espace. Le robinet est constitué d'un obturateur tournant présentant une ouverture et d'un siège présentant une ouverture correspondant à celle de l'obturateur. L'obturateur est fixé à la tige, près de l'extrémité opposée au stator. Le siège de l'obturateur, monté à proximité de ce dernier, est fixé au stator. Ce dispositif de commande est conçu pour déplacer le rotor axialement de manière à l'éloigner du stator, ce qui éloigne l'obturateur de son siège, à tourner la tige jusqu'à ce que l'ouverture de l'obturateur coïncide avec l'ouverture du siège, puis à déplacer de nouveau le rotor axialement de manière à le ramener à la même distance du stator qu'au départ.

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