Many rural outbuildings need ventilation. Without it, houses and sheds become damp, cellars and basements get wet, and using an outdoor privy without a fan is, to put it mildly, uncomfortable.
Of course, fitting a toilet or cellar with an electric supply or exhaust fan is not difficult, but many dacha buildings are far from always electrified. But the fan I want to tell readers about does not need mains power — it is driven by… a rotary wind engine.
1 – wind fan; 2 – privy; 3 – vent pipe; 4 – pit
Anyone can build such a device. All of its “mechanics” consist of a rotary wind engine and a 12-bladed fan. Both are mounted on the shaft of a bearing unit made from the hub of a bicycle front wheel. The hub is fastened with M4 bolts and nuts in the centre of a circle cut from 8 mm plywood.
1 – rotary wind engine; 2 – nut securing the wind engine on the shaft; 3 – bearing unit (bicycle front-wheel hub); 4 – fan impeller (steel or duralumin sheet s2); 5 – wood screw fastening the wind fan to the vent pipe (12 pcs.); 6 – vent pipe (square-section box built from s20 boards); 7 – nut securing the fan impeller on the shaft; 8 – receiver (plastic basin); 9 – M5 bolts and nuts fastening the bearing unit to the receiver lid (3 sets); 10 – receiver lid (plywood s8)
The rotary wind engine is assembled from a pair of half-cylinders and two disks of 6 mm plywood. A good blank for the half-cylinders is an old aluminium pot or bucket. A plastic vessel of suitable size will also work. The pot is cut carefully along a diametral plane and clamped between two plywood disks as shown in the figures.
The fan impeller has 12 blades; it can be made from steel or duralumin sheet about 2 mm thick. After making the flat blank, each blade is bent twice as shown in the photo, by about 90°, and the direction of the bend depends on whether you need a supply or an exhaust fan.
1, 2 – end washers (plywood, s8); 3, 4 – rotor half-cylinders; 5 – angle bracket for joining half-cylinders and washers (6 pcs.); 6 – fastening half-cylinders and washers (M5 bolt with nuts, 12 sets)
The wind fan is mounted on top of a kind of receiver — a small plastic basin with a hole in the bottom for the vent pipe (asbestos-cement or built from boards). In the upper part of the receiver (above the fan impeller), holes are cut for air to exit (or enter).
(A – blank, B – finished impeller)
The finished unit is secured on top of the vent pipe — and it will continuously (and completely free of charge!) ventilate your toilet or cellar.
Modelist-Konstruktor No. 4’2012, I. KHOROSHEVSKY
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