Magnetically coupled actuator and limit switch assembly for a sealed chamber system
A programmable, electronically controlled sprinkler system has a hermetically sealed internal chamber which encloses all of the internal water flow, valves, mechanical and rotational components and a plurality of magnetic coupling arrangements which allow external motors to control operation of the internal mechanical components without requiring any hydraulic seals.
1. A magnetic coupling assembly comprising:
a sealed chamber having a chamber wall;
an internal body rotatably mounted within said sealed chamber, said internal body having an axis of rotation aligned normal to said chamber wall;
an internal magnet received in said internal body on said axis of rotation;
an external coupling body rotatably mounted on an exterior surface of said chamber wall, said external coupling body having an axis of rotation aligned normal to said chamber wall and coaxial with said axis of rotation of said internal body;
an external magnet received in a socket in said external coupling body on said axis of rotation;
said internal and external magnet having north and south poles aligned parallel to the chamber wall and in phase with each other; and
wherein said internal magnet is magnetically coupled to said external magnet and said internal magnet and internal body are correspondingly rotated by rotation of said external coupling body and external magnet,
said external magnet being slidably movable within said socket of said external coupling body along said axis of rotation,
wherein said external magnet is repulsed by said internal magnet and slidably moves within said socket when said internal body and said internal magnet are prevented from rotating and said external coupling body continues to rotate, forcing said external magnet out of phase with said internal magnet and creating a repulsive force pushing said external magnet away from said chamber wall.
2. The magnetic coupling assembly of claim 1 further comprising a sensor configured and arranged to sense an end of rotation of said internal body within said sealed chamber.
3. The magnetic coupling assembly of claim 2 wherein said sensor comprises a mechanical switch which cooperates with said external coupling body.
4. A magnetic coupling assembly comprising:
a sealed chamber having a chamber wall;
an internal body rotatably mounted within said sealed chamber, said internal body having an axis of rotation aligned normal to said chamber wall;
an internal magnet received in said internal body on said axis of rotation;
an external coupling body rotatably mounted on an exterior surface of said chamber wall, said external coupling body having an axis of rotation aligned normal to said chamber wall and coaxial with said axis of rotation of said internal body;
an external magnet received in a socket in said external coupling body on said axis of rotation;
said internal and external magnet having north and south poles aligned parallel to the chamber wall and in phase with each other; and
a reversible motor driving rotation of said external coupling body,
wherein said internal magnet is magnetically coupled to said external magnet and said internal magnet and internal body are correspondingly rotated by rotation of said external coupling body and external magnet
said external magnet being slidably movable within said socket of said external coupling body along said axis of rotation,
wherein said external magnet is repulsed by said internal magnet and slidably moves within said socket when said internal body and said internal magnet are prevented from rotating and said external coupling body continues to rotate, forcing said external magnet out of phase with said internal magnet and creating a repulsive force pushing said external magnet away from said chamber wall.
5. The magnetic coupling assembly of claim 4 further comprising a sensor configured and arranged to sense an end of rotation of said internal body within said sealed chamber.
6. The magnetic coupling assembly of claim 5 wherein said sensor comprises a mechanical switch which cooperates with said external coupling body.
7. A magnetic coupling assembly comprising:
a sealed chamber having a chamber wall;
an armature rotatably mounted within said sealed chamber, said armature having an axis of rotation aligned normal to said chamber wall;
opposing armature stops within said sealed chamber, said armature being rotatable between said opposing armature stops;
an internal magnet received in said armature on said axis of rotation;
an external coupling body rotatably mounted on an exterior surface of said chamber wall, said external coupling body having an axis of rotation aligned normal to said chamber wall and coaxial with said axis of rotation of said armature;
an external magnet received in a socket in said external coupling body on said axis of rotation;
said internal and external magnet having north and south poles aligned parallel to the chamber wall and in phase with each other; and
a reversible motor driving rotation of said external coupling body,
wherein said internal magnet is magnetically coupled to said external magnet and said internal magnet and armature are correspondingly rotated by rotation of said external coupling body and external magnet
said external magnet being slidably movable within said socket of said coupling body along said axis of rotation,
wherein said external magnet is repulsed by said internal magnet and slidably moves within said socket when said armature engages one of said armature stops preventing further rotation of said armature and said internal magnet and said external coupling body continues to rotate, forcing said external magnet out of phase with said internal magnet and creating a repulsive force pushing said external magnet away from said chamber wall.
8. The magnetic coupling assembly of claim 7 further comprising a sensor configured and arranged to sense an end of rotation of said armature within said sealed chamber.
9. The magnetic coupling assembly of claim 8 wherein said sensor comprises a mechanical switch which cooperates with said external coupling body.
10. The magnetic coupling assembly of claim 9 wherein said mechanical switch is a limit switch mounted on said axis of rotation of said external coupling body adjacent to said external magnet, and
wherein said external magnet slidably moves within said socket into engagement with said limit switch when said armature engages one of said armature stops.
11. The magnetic coupling assembly of claim 7 wherein said external coupling body comprises a coupling gear and further comprising a motor gear engaged with said coupling gear for driving rotation of said coupling gear.
12. The magnetic coupling assembly of claim 10 wherein said external coupling body comprises a coupling gear and further comprising a motor gear engaged with said coupling gear for driving rotation of said coupling gear.
13. The magnetic coupling assembly of claim 7 wherein the armature is rotatably supported in a well within said chamber wall.
14. The magnetic coupling assembly of claim 7 wherein said internal and external magnets are square.
15. The magnetic coupling assembly of claim 10 wherein said internal and external magnets are square.
16. The magnetic coupling assembly of claim 7 further comprising a mechanical limit switch mounted on said axis of rotation of said external coupling body adjacent to said external magnet,
wherein said external magnet is repulsed by said internal magnet and slidably moves within said socket into engagement with said limit switch.
17. The magnetic coupling assembly of claim 16 wherein said external coupling body comprises a coupling gear and further comprising a motor gear engaged with said coupling gear for driving rotation of said coupling gear.
18. The magnetic coupling assembly of claim 16 wherein said internal and external magnets are square.
19. The magnetic coupling assembly of claim 17 wherein said internal and external magnets are square.