Positive Displacement Fluid Control
Pump / Fan / Compressor
and Energy Generation Systems
Positive Displacement Fluid Control
Pump / Fan / Compressor
and Energy Generation Systems
Pump / Fan / Compressor
and Energy Generation Systems
Pump / Fan / Compressor
and Energy Generation Systems
Conventional rotary positive displacement devices have limitations, including, depending on the type, high friction, low volume, high speed, complex valving, lack of fine adjustment and are usually non reversible (neither directionally nor switching from pump to generator mode).
We solve all of the above by using individually controlled but synchronized paddles which approach & distance themselves from each other to achieve the required function.
Patent Pending in approximately 30 countries. WO 2022/115665 .
Now seeking interested partners to develop & license in fields such as air cooling, air-conditioning, medical, energy, food industry, industrial pumps/compressors/generators & consumer goods.
Although electric motors could be used to control the two paddles independently, several novel gearbox options have been developed which mechanically lock in the synchronized movements.
Here the input is turned by hand - note how the paddles (with arcs at their extremities) approach & distance themselves from each other and how their positions relate to the inlet/outlet openings.
Here we attach a standard drill - a quasi constant speed drive is sufficient and needs no advanced electronics nor software, the gearbox does the work (as example, the drill chuck was actually slipping on reverse, but, no problem, the system remained in synchronization).
Device works as a generator from pressure or vacuum applied to either of the inlet/outlet ports. Here we use 100mBar suction from a vacuum cleaner to demonstrate. Its generating around 100W. Pressurized air would doubly increase output (torque & speed), but these demonstrators are not suitable for that - they consist of only rapid prototyped plastic parts.
This alternative gearbox with reduction has a 4:1 mechanical advantage allowing more torque at the paddles. But main advantage is that this gearbox is dynamically balanced by design, compared to the one used on earlier videos which has counter-balance added (avoiding is usually better than compensating).
A Ø4 x 1.5" fan, using a BLDC motor, a 3rd type of gearbox & radial balancing, all within central hub (for compact applications). Static pressure head of 16mm H2O and max flow of 3cfm at motor speed of 1000rpm. In addition to gaps, tolerances, noisy loose non-helical gears, interference & sliding bearings, the 3W rated motor (Ø20 x 10mm) is a key limitation here - already forcing 11W into it (dare not go any higher) - need to move to a larger motor for next iteration, but progress being made!
A Ø6" x 1.8" fan, using a more powerful BLDC motor. At 10W, we are achieving 3" H2O static, 1.7" at 8cfm and full open flow of 16cfm - all at speeds of only a few hundred rpm. We are now seriously challenging incumbent technologies. Next version will have a different layout to allow full dynamic balancing of paddles so that we can safely run at much higher speeds, together with other features including ball bearings, a modified gearbox, paddle optimization - all in iterations as we progress.
A Ø6" x 5" fan, with: one stage straddling the other in the vertical so as to have evenly-distributed inertia for dynamic balance, ball bearings, a two-stage gearbox and a larger motor. This gives high bEMF, low current (heat) and high inertia allowing a low-power control loop. It pulls (vacuum) just as well as it pushes (pressure). Then, at 22W total (Work+Heat+Electronics), we are getting 3 inches water at zero flow and up to 50 CFM at no load (broke a gear, so showing 12W).
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