On October 21st, 1909, Nikola Tesla (an inventor of many ingenious items) filed a patent for a pump which uses smooth rotating disks inside a volute casing. Tesla's novel method of "fluid propulsion" was based on two basic principals of physics: "adhesion and viscosity". 1,061,142, May 6th, 1913. The pump disks are keyed to a single shaft (a dark rod in the top drawing from the patent). The inlets for the fluid are shown in light blue in the upper drawing. Each disk has holes cut in the center "preferably curved, as shown". We have highlighted the holes in light blue in the lower drawing. The patent states that to reduce clogging, a solid disk or disks ("each in its own casing") can be used. Also, the pump can be staged for increased pressure, using the output of one disk as the input to the next, in series, on one shaft. With a rotational force applied to the shaft, rotating the keyed disks, the fluid rotates as well and moves towards the outer edge of the disks. In the lower drawing the fluid spirals out in a counter-clockwise direction.
The fluid might complete one or more revolutions, or less than a revolution, before reaching the outer edges of the disks, depending on the viscosity of the fluid, the speed of rotation, the width between the disks, and other factors. Here we have highlighted in red, the exit path of the fluid through the volute, after it has spiralled out from the center as the disks rotate. In the bottom drawing the fluid and the disks all rotate in a counterclockwise direction. The author once saw a delightful working model of this pump. It was made out of stiff paper and tape. Copies of patents are available from the U.S. Patent office for a small fee. This Glossary is a part of a complete educational tutorial about pumps! Mechanical pumps are the second most common machine in the world (after electric motors).Most people are unfamiliar with how the many different kinds of pumps work! Call us toll free to order the program on CD-ROM! Click here for more information!
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