Solar dryer with passive rotor turbolizer

Abstract

The Utility Model relates to the field of heat engineering and more specifically to solar dryers using natural convection to carry out drying processes and is used in households and small farms for ecological and economical drying of textiles, agricultural products, herbs, fruits and other materials, where intensive air exchange is required under controlled temperature conditions. The solar dryer includes a solar air collector (10), an inlet air duct (11) and a drying chamber (12), on the upper part of which an outlet opening 15 is located, and along the length of the air duct (11) between the solar air collector (10) and the drying chamber (12) a passive rotor turbolizer (14) is located. The passive rotor turbolizer (14) consists of an inlet confuser (1), connected by a flange (8) to an inlet air duct (11), an outlet diffuser (2), located in the upper part of the passive rotor turbolizer (14) and attached to it by a support frame (6) and a rotor (3), equipped with profiled blades, whereby the rotor (3) is mounted on a vertically oriented central axis (9), connected by means of two hybrid ceramic bearings (5) respectively at one end to the inlet confuser 1, and at the other end to the outlet diffuser 2. At the base of the axis (9) is located a magnetic system (4), implemented by a pair of repulsive annular neodymium magnets, located with the same poles facing each other, and around the rotor (3) is located a fixed stator ring (7) with guide blades, located at an angle allowing the swirling of the inlet air in a direction coinciding with the direction of rotation of the the rotor (3). The profiled blades of the rotor (3) have an aerodynamic profile and progressive torsion geometry, in which the angle of attack of the blades is greater at their base, preferably 48° and decreasing towards their periphery, preferably to 12°, the profile of the blades being an asymmetric "airfoil" type with a concave lower surface and a convex upper surface.