The housing and blades of electric ventilation fan

Electric ventilation fan casing is generally constituted by two materials of plastic and metal. Electric ventilation fan in the transmission machinery and fixed parts are generally plastic, rubber, metal three materials. Electric ventilation fan of many parts, each part of the materials used, such as motors, reactors, timer, and a variety of switching elements constituent materials and special.

Cover wire nets do generally judge the advantages and disadvantages of the standard is the nets wire thickness, the thicker the better will not be deformed, not easy to go in a child's hand. Average net cover stars before and after the two parts, the rear cover with a diameter of 1.0-1.5mm steel wire on a flat steel wire of about 2mm × 5mm, made with a skeleton radial or spiral-shaped, by means of screws or locking nut fastening the front of the fan head cover. The front cover made of the same material as the radiation-shaped, front grilles rely on clamping clip after net cast. The outer surface of the nets, chrome or spray treatment, increase the aesthetic and prevent rust. The center of the front grilles are generally equipped with a decorative circle.

The number of axial flow fan blades often is odd, this is because the use of the even piece shape symmetrical blades, if not adjusting the balance, it is easy to make the system resonance occurs with the blade material can not resist the vibration generating fatigue will make the blade or spindle breaks, mostly designed to the odd blades designed on the axis of asymmetry. This principle is also commonly applied to including part of the helicopter propeller blade design.

Electric ventilation fan blades are made of PP material, that is, we often say that the recycled plastic, lower costs, there is a kind AS material is engineering plastic, relative to that cost higher, but the quality will be good many, most electric ventilation fan blades made of engineering plastic injection molding.