Claims
- 1. A low head, high volume pump comprising an inner cylinder and a substantially larger outer cylinder joined as two vertical concentric cylinders, vertical partitions between the cylinders dividing a space between the cylinders into an inlet chamber and an outler chamber which is substantially larger in volume than the inner cylinder to form an air chamber to reduce pump pulsations, upper and lower inlet ports between the inlet chamber and the inner cylinder and upper and lower outlet ports between the outlet chamber and the inner cylinder, spring loaded valves in the ports for permitting flow from the inlet chamber to the cylinder and for permitting flow from the cylinder to the outlet chamber, a piston in the inner cylinder, upper and lower end covers on the inner cylinder, a piston rod connected to the piston and extending through one of the end covers, an inlet connected to the inlet chamber, an outlet connected to the outlet chamber, wherein the springs on the valves at the inlet ports are tension springs and extend through the outer cylinder, and the springs on the valves at the outlet ports are tension springs and extend through the inner cylinder.
- 2. The apparatus of claim 1 wherein the valves are curved hinged flap valves with hinges at vertical edges thereof connected to a wall of the inner cylinder adjacent the ports.
- 3. The apparatus of claim 2 wherein the flap valves at the inlet ports are mounted on an inside of the inner cylinder and wherein the flap valves on the outlet ports are mounted on an outer side of the inner cylinder.
- 4. The apparatus of claim 3 wherein the flap valves comprise a curved sheet of elastomeric material for contacting a surface of the inner cylinder surrounding a port and a complimentary rigid reinforcing sheet curved similarly to a wall of the inner cylinder and wherein the springs are connected to the rigid reinforcing sheet.
- 5. The apparatus of claim 1 wherein the piston comprises a flat round fiberglass support having a central portion and a lower portion extending radially outward beyond the central portion, elastomeric ring means mounted outwardly on the outer section and a ring compressor comprising a fiberglass annulus having a downward extending radial flange for bearing against the ring means and means for urging the ring compressor downward toward the outer portion.
- 6. The apparatus of claim 1, wherein the valves are flat and operate on a cylinder end for the outlet valves and under a cylinder end for the inlet valves.
- 7. The apparatus of claim 1 wherein the inner cylinder is divided axially into three sections, an upper valve section, a lower valve section and a middle piston receiving section.
- 8. The apparatus of claim 7 wherein the middle section has an inner cylinder liner.
- 9. The apparatus of claim 1 wherein the valves comprise a curved elastomeric sheet, an axially extending rigid hinge portion extending along one axial edge of the elastomeric sheet, a curved rigid backing portion spaced from the hinge portion and extending over a remainder of the elastomeric sheet.
- 10. The apparatus of claim 9 further comprising axially extending fiberglass reinforcing strips on a side of the elastomeric sheet opposite the rigid backing and means for joining the strips and the rigid backing for maintaining the shape of the elastomeric element.
- 11. The apparatus of claim 1 wherein the outer cylinder comprising a surge tank having an outlet for delivering pump water, a sump tank having an inlet through which pump water enters.
- 12. The apparatus of claim 11 wherein the sump and surge tanks are open to atmosphere.
- 13. The apparatus of claim 12 further comprising a manifold extending between upper and lower inlet ports of the inner cylinder.
- 14. The apparatus of claim 13 wherein the height of the surge tank is variable with respect to the height of the sump tank in response to changes in head.
- 15. The apparatus of claim 14 wherein the sump and/or surge tank are heightened and covered to create an air cell and to allow a higher pumping head.
- 16. The apparatus of claim 15 wherein a small orifice is added to the sump air cell portion of the suction sump for charging the air cells formed by the covers.
- 17. A low head high volume pump apparatus comprising an outer vertical cylinder and an inner vertical cylinder, the outer vertical cylinder being substantially taller than the inner vertical cylinder, a partition extending across the outer vertical cylinder and connected to the inner vertical cylinder, the partition dividing the outer vertical cylinder into an inlet sump chamber and an outlet surge chamber, the outlet surge chamber extending upward above the inner cylinder to form an air chamber to reduce pump pulsations, an inlet connected to the sump chamber and an outlet connected to the surge chamber, the inner cylinder having a central portion in which a piston moves and having upper and lower valve portions, each of the valve portions having an inlet valve opening communicating with the inlet chamber and an outlet valve opening for communicating with the surge chamber, and spring loaded valves positioned in the valve openings for automatically opening an inlet opening as a piston moving within the central portion moves away from a valve portion and opening an outlet valve opening as a piston in the central portion moves toward a valve portion, wherein the spring loaded valves have springs which extend through the inner cylinder, the springs on the valves at the inlet ports being compression springs and the springs on the valves at the outlet ports being tension springs.
- 18. The apparatus of claim 17 wherein a top of the outer cylinder is open.
- 19. The apparatus of claim 17 further comprising an inlet manifold connected to the intake openings of the valve portions of the inner cylinder, the inlet manifold having a volume greater than a volume of the inner cylinder.
- 20. The apparatus of claim 17 wherein the outer cylinder extends above and below the inner cylinder and wherein the extension of the outer cylinder above the inner cylinder is greater than an extension of the outer cylinder below the inner cylinder, and wherein a diameter of the outer cylinder is greater than three times a diameter of the inner cylinder, whereby the sump and the surge tank have volumes substantially greater than a volume of the inner cylinder.
- 21. The apparatus of claim 17, wherein the valves are flat and operate on a cylinder end for the outlet valves and under a cylinder end for the inlet valves.
Parent Case Info
This is a continuation-in-part of Application Ser. No. 802,289 filed Nov. 27, 1985 by Don E. Avery and Bryan F. Young, now U.S. Pat. No. 4,699,574.
US Referenced Citations (12)
Continuation in Parts (1)
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Number |
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802289 |
Nov 1985 |
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