Dual armature solenoid valve assembly
View Patent ↗An electromagnetic valve assembly having a dual armature solenoid for controlling two valves is disclosed. In one embodiment, the solenoid may include a first pole piece, a second pole piece spaced from the first pole piece, a coil disposed about at least a portion of the first pole piece, a first armature extending laterally across the first pole piece and the second pole piece, and a second armature extending laterally across the first pole piece and the second pole piece. In one illustrative embodiment, the first armature and the second armature pivot relative to the second pole piece. In another illustrative embodiment, the first armature and the second armature pivot relative to the first pole piece. In yet another illustrative embodiment, the first armature and the second armature pivot relative to opposite pole pieces. In any case, the coil may electromagnetically actuate the first and second armatures to selectively open and/or close corresponding valves or other actuatable components.
1. A solenoid comprising:
a first pole piece;
a second pole piece separate from the first pole piece, and spaced from the first pole piece;
a coil disposed about at least a portion of the first pole piece the coil producing a magnetic flux in the first pole piece when activated;
a first armature extending across the first pole piece and the spaced second pole piece, the first armature pivoted on or adjacent to the first pole piece or the second pole piece;
a second armature extending across the first pole piece and the spaced second pole piece, the second armature pivoted on or pivoted adjacent to the first pole piece or the second pole piece wherein the first armature, the second pole piece and the second armature each act as part of a flux concentrator for concentrating the magnetic flux produced by the coil in the first pole piece across one or more air gaps.
2. The solenoid of claim 1 further comprising:
a first biasing mechanism adapted to bias the first armature away from whichever one of the first pole piece or the second pole piece that the first armature does not pivot on or adjacent to; and
a second biasing mechanism adapted to bias the second armature away from whichever one of the first pole piece or the second pole piece that the second armature does not pivot on or adjacent to.
3. The solenoid of claim 2 wherein the coil is wound around a bobbin, wherein the first biasing mechanism is attached to the first armature and the bobbin and the second biasing mechanism is attached to the second armature and the bobbin.
4. The solenoid of claim 2 wherein the first armature and the second armature are pivotably moved to work against the biasing mechanisms when a sufficient current is provided through the coil to produce a magnetic force large enough to overcome the biasing force of the biasing mechanisms.
5. The solenoid of claim 1 wherein the first armature can be actuated to open and close a first valve, and the second armature can be actuated to open and close a second valve.
6. The solenoid of claim 5 wherein the first and second valves are pneumatic valves.
7. The solenoid of claim 1 wherein the first armature and the second armature are positioned on opposite sides of the coil.
8. The solenoid of claim 1 wherein the first pole piece is positioned parallel to the second pole piece.
9. The solenoid of claim 1 wherein the one or more air gaps are between the first armature and one or more of the first pole piece and the second pole piece, and/or between the second armature and one or more of the first pole piece and the second pole piece.
10. An electromagnetic valve assembly comprising:
a first armature that can open and close a first valve;
a second armature that can open and close a second valve;
a first pole piece provided between the first armature and the second armature;
a second pole piece separate from the first pole piece, and spaced from the first pole piece;
a first biasing mechanism for biasing the first armature away from the first pole piece;
a second biasing mechanism for biasing the second armature away from the first pole piece;
a coil coaxially disposed about the first pole piece;
wherein the first armature engages the second pole piece and pivots, and wherein the second armature engages the second pole piece and pivots; and
wherein the coil induces a magnetic force in the first pole piece to pivot the first and second armatures against the first and second biasing mechanisms.