Flow meter with hollow blocking rotor
View Patent ↗A flow meter is disclosed with a hollow blocking rotor. The flow meter includes a housing that has a cavity with an inlet and an outlet. The flow meter also includes a pair of displacement rotors with a blocking rotor disposed between the displacement rotors. The blocking rotor includes a pair of convex walls and a pair of concave walls. The blocking rotor further includes a shaft coupled to the pair of concave walls. Each concave wall is disposed between and coupled to a pair of opposing convex walls. The concave walls provide clearance for rotation of the displacement rotors when the displacement rotors sweep along the concave walls. The hollow configuration of the blocking rotor reduces the impedance of the flow meter.
1. A blocking rotor for a rotary fluid displacement device that also includes a pair of displacement rotors that flank the blocking rotor, comprising:
a pair of convex walls and a pair of concave walls,
each concave wall being disposed between and coupled to the pair of opposing convex walls, the concave walls being coupled together,
wherein the concave walls provide clearance for rotation of the displacement rotors.
2. The blocking rotor of claim 1 wherein the concave walls are coupled together by a shaft.
3. The blocking rotor of claim 2 wherein the shaft couples the concave walls together at apexes of the concave walls.
4. The blocking rotor of claim 2 wherein the shaft is hollow.
5. The blocking rotor of claim 2 wherein the shaft is solid.
6. The blocking rotor of claim 1 wherein the concave walls are coupled together at apexes of the concave walls.
7. The blocking rotor of claim 1 wherein the blocking rotor is cast with gates and overflows being disposed on the concave walls.
8. A flow meter comprising:
a housing having a cavity with in inlet and an outlet;
a pair of displacement rotors with a blocking rotor disposed between the displacement rotors;
the blocking rotor including a pair of convex walls and a pair of concave walls, each concave wall being disposed between and coupled to the pair of opposing convex walls, the concave walls being coupled together;
wherein the concave walls provide clearance for rotation of the displacement rotors when the displacement rotors sweep along said concave walls.
9. The flow meter of claim 8 wherein a shaft couples the concave walls together.
10. The flow meter of claim 9 wherein the shaft couples the concave walls together at apexes of the concave walls.
11. The flow meter of claim 9 wherein the shaft is hollow.
12. The flow meter of claim 9 wherein the shaft is solid.
13. The flow meter of claim 8 wherein the concave walls are coupled together at apexes of the concave walls.
14. The flow meter of claim 10 wherein the blocking rotor is cast in a mold that includes gates and overflows and wherein the gates and overflows being disposed on the concave walls.
15. The flow meter of claim 10 wherein the cavity is trefoil-shaped.