Bi-stable electrically actuated valve
A pinch valve may use a spring force to close a collapsible tube at a pinch point, and may open with a cam mechanism, which may be controlled using an electric motor. The open and closed positions of the pinch valve may be stable without the use of continuing electrical energy, and electrical energy may be consumed during a change between positions. One arrangement may use multiple tubes in a circular arrangement with a cam that may operate one or more of the valves at a time. The cam mechanism may be driven by an electric motor.
1. A valve bank comprising:
a plurality of collapsible tubes, said collapsible tubes being arranged about a central axis;
a clamp arm assembly comprising, for each of said collapsible tubes:
a clamp disposed to pinch said collapsible tube; and
a closing force generator generating a closing force against said collapsible tube, said closing force generator simultaneously applying said closing force to each clamp in said clamp arm assembly;
a cam mechanism comprising a moving cam lobe adapted to rotate about said central axis, said moving cam lobe being disposed to open a first one of said clamps and thereby open a first one of said collapsible tubes.
2. The valve bank of claim 1 further comprising:
an electric motor disposed to drive said moving cam lobe.
3. The valve bank of claim 2 , said cam mechanism further comprising a stop.
4. The valve bank of claim 2 , said closing force generator comprising a tension mechanism mounted around each of said clamps.
5. The valve bank of claim 4 , said tension mechanism being an elastic member.
6. The valve bank of claim 1 further comprising:
a manifold having an intake and a plurality of outputs, each of said outputs being connected to said plurality of collapsible tubes.
7. The valve bank of claim 1 , said clamp arm assembly being manufactured as a single piece with said clamps.
8. The valve bank of claim 1 , said cam mechanism comprising a roller.
9. The valve bank of claim 1 , said closing force generator being an O-ring.