The Rotapump Model
100 is a wellhead pump that easily pumps 2-inch monitoring wells
from any depth. The pump is easily transported, setup, and operated
using a portable drill or electric motor powered by a car battery.
Decontamination of equipment between wells is eliminated because
the pump uses a dedicated pumping tube stored in each well. The
pump is self priming from any depth and can pump sediment laden
water with no difficulty. The pumping rate can be precisely controlled
at a constant rate from 1/4 gpm up to 6 gpm or more. Sediment-free
low-flow purging and sampling are easily done by placing the pumping
tube inside a stilling tube.
The pump has an elliptical plate mounted on a rotating shaft. As the
shaft rotates the edge of the plate moves up and down. This up and
done motion is transferred to a follower with rollers bearing on the
top and bottom of the plate. The follower is constrained to move only
vertically by rollers attached to each side of the follower that bear
on vertical rods. A pumping tube with a bottom check valve is attached
the follower with hose clamps so that with each revolution of the plate
the pumping tube move up and down once. On the down stroke, the bottom
check valve opens due to water resistance and admits water into the
pumping tube. On the upstroke the pumping tube is lifted and the check
valve closes due water pressure. Water is incrementally added to the
pump tube and once the tube is full, water is discharged from the tube
and well. At high RPM, the rapid lifting of the pumping tube on the
upstroke imparts upward momentum to the water in the tube. On the rapid
reversal of direction on the downstroke, the momentum causes water
to continue to flow upward and draw additional water in the tube through
the bottom check valve.
Briefly stated, the pump mechanism action converts horizontal rotary
motion into cyclic up-and-down motion, the vertical motion is imparted
to a pumping tube having a bottom check valve, and the cyclic up-and-down
motion jacks water up then out of the pumping tube. The faster the
up-and-down motion the greater the flow rate.
Pump parts are primarily stainless steel, aluminum, and Teflon/Delrin.
All shaft and roller bearings are sealed. The pump does not require
lubrication and is easily disassembled. Load bearing materials in contact
are aluminum or steel and Telflon/Delrin. This combination of materials
results in negligible wear of mated bearing surfaces.
A drill harness is offered for operation of the pump
using a portable drill. A speed controller placed between the drill
and 12 volt battery is offered for precise control of the flow rate.
A 450 Watt DC motor that mounts securely on the pump is also available.
The motor is designed for use with the speed controller. The pump is
most easily used with the 450 Watt motor and speed controller and is
the recommended style of use.
Please
call or fax McEdwards Manufacturing & Distribution to
discuss your sampling requirements. You can
view demonstration videos and place
orders.
Rota
Pump - United States Patent # 7069986
