Radial Piston Pump
Radial Piston Pumps can produce a very smooth flow under extreme pressure. Generally they are variable-displacement pumps.
In variable models, flow rate changes when the shaft holding the rotating pistons is moved with relation to the casing (in different models either the shaft or the casing moves.) Output can also be varied by changing the rotation speed.
In this animation if the casing (shown in red) is moved to the left, the flow rate would decrease to zero. If it is moved even further to the left the flow would reverse.
Input in this animation is through the TOP two black holes near the center below the “Pintle” (shown in yellow). Output is through the BOTTOM two black holes, above the pintle. Higher pressure areas are indicated with a DARKER blue fluid color.
The pistons are usually forced out by springs. They are forced back in, expelling liquid, by the casing.
An odd number of pistons is always used to smooth the hydraulic balance. These pumps revolve at speeds up to about 1200 RPM.
Note similarities to, and differences from, the wobble pump, swash plate pump, and bent axis pump.
Rag Pumps have been used for at least 400 years and probably a lot longer.
Their use was widespread. Rag pumps were used aboard large sailing ships to bring salt water up for various uses and they were also used in wells. Horses, a water wheel, or “tramping men” all might have supplied the power to turn the wheel.
Cloth bundles, usually just rags, are tied in knots at intervals on a rope or chain. The chain is then hung around a wheel and through a tube that goes below water level. The base of the tube is flanged to prevent the rag balls from catching.
When the wheel rotates water is drawn up a tube.
This pump is very similar to a Lift Disk Pump and Bucket Pump.
Ram Pumps only have two moving parts, making them virtually maintenance-free.
Water enters the lower of two chambers through a pipe from an elevated water source. This pipe must be relatively long and thick so that significant force (inertia) is developed as the water moves down it to the chamber.
As water rushes in it starts the pump. The chamber fills and the ESCAPE VALVE (on the left here) shuts. The DELIVERY VALVE to the AIR DOME opens.
The momentum of the rushing water pushes some water into the air dome and compresses the air that partially fills that chamber. When the pressure is great enough it opposes the force of the incoming water and the second valve drops shut.
After the delivery valve shuts, air pressure pushes water up the outlet pipe. In the first chamber, all valves are closed and no water can move, so the escape valve drops open and the cycle begins to repeat, about once a second.
This is an ideal pump when a plentiful water source is available. Roughly 3/4’s of the water that passes through the system exits via the escape valve.
Recessive Spiral Pump
This pump category, now internationally patented, was invented by Australian naturalist and marine designer Jayden Harman after decades of study of the plant and animal kingdom.
The basic design of the impeller is a logarithmic spiral shape variously known as a Phi Ratio, a Phi Geometry, a Fibonacci Sequence, or a Proportional Spiral. In three dimensions, these patterns can be called Recessive Spirals. To visualize a recessive spiral, imagine the inside of a conch shell. Of course, nature never needs to mathematically determine a Fibonacci sequence, but she has nevertheless once again pointed us in the proper direction, a direction which we can only follow if enough numbers are crunched and experimental designs tested. One impeller variation is shown in the photo.
By smoothly accelerating the fluid centripetally (towards the center), and by minimizing turbulence, Recessive Spiral pump designs lessen vibration, and reduce or even have a negative heat gain, while delivering more thrust with virtually no cavitation. Advance the technology through the use of computer design, 3-D molding techniques, studies across hundreds of plant, animal, and other natural implementations of the Phi geometry, and build and test refinement after refinement of the basic concepts, and you have a pump which can move extraordinary amounts of fluid with incredible efficiency.
Rotary Cam Pump
Rotary Cam Pumps come in many variations. This animation is also called a Cochrane Rotary Pump. It is not in use now and is mainly of historical curiosity.
In this model the intake is the lower tube on the right and the outlet is at the top. The piston slide arm moves around inside a slot in the casing.
As an eccentric cam rotates the circular plunger around the edge of the casing, fluid is swirled around the edge to the outlet port.
One variation of this type of pump is the Kinney Rotating Plunger Pump which ejects the fluid through a hollow in the slide pin and a discharge port on the discharge side of the pump.