ventilator
ã€definition】
Ventilating fan A type of air conditioning appliance that is driven by a motor to rotate the air flow of a fan blade to allow indoor and outdoor air exchange. Also known as the ventilation fan. The purpose of ventilation is to remove the dirty air in the room and regulate the temperature, humidity and sensory effects. Ventilators are widely used in homes and public places.
ã€Development History】
In 1958, ventilation fans were put into production in Japan. Early products can only be exhausted in one direction, called exhaust (wind) fans. In 1964, shutter-type ventilation fans appeared. China's Guangdong Province, Jiangmen City, home appliance industry company in 1974 for the first time the production of 200mm open exhaust fan. Shenyang's exhaust fan plant began production of 300mm metal-type shutter-type exhaust fans in 1976. In 1979, it produced 300mm two-way shutter-type ventilation fans.
ã€working principle】
There are three kinds of ventilation methods for exhaust fans: discharge type, suction type, and combination type. The exhaust type enters the air from the natural air inlet, and the dirty air is discharged through the ventilation fan; the suction type sucks fresh air through the ventilation fan and discharges the dirty air from the natural exhaust port; and the use type is that the suction and the exhaust are completed by the ventilation fan. A type of air-conditioning appliance that drives the air flow by a fan to rotate the air to exchange indoor and outdoor air. Also known as the ventilation fan. The purpose of ventilation is to remove the dirty air in the room and regulate the temperature, humidity and sensory effects. Ventilators are widely used in homes and public places.
Ventilation volume, different sites need to change the amount of ventilation and the number of ventilation. The amount of fresh air required by a person or per square meter is called the required ventilation. The number of fresh air changes within one hour is referred to as the number of air changes (see table).
Ventilation fan structure
Louvered ventilation fans are the most widely used ventilation fans and consist mainly of motors, blades, wind frames, panels, shutters, and special pull switches. The motor generally uses a single-phase capacitor running asynchronous motor. Vented motors below 150mm are also shaded-pole motors. Fan blades are generally injection molded with ABS and AS plastics, which are light weight and high strength. The air frame is usually made by stamping and spot welding of sheet steel, and plastic injection molding is also used. The panel is plastic injection molded. Shutters are usually stamped and formed from sheet steel or tinplate.
The specifications of the ventilation fan are divided into 100, 150, 200, 250, 300, 350, 400, 450 and 500 mm according to the fan blade diameter. Map related connections.
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