Revolving door in the late 19th century by both Cypriot Burleigh Van 坎尼尔 registered in the US Patent, where Mr. 坎尼尔 original patent include: two wings door, three-wing door, four-wing doors, and five-wing doors. Revolving door is used to prevent direct flow to bad smells, sounds, dust and dirt into the building. His trademark is "always open - closed forever." Rising air in the building on the ground floor entrance of direct and proportional to the height of the building pressure. Although the building itself and the pressure caused by the wind, there is a lot of airflow and surface wind, the revolving door is still up and running effortlessly, light and comfortable, because the air pressure inside and outside the door and the door of pneumatic equal. In the 1920s Italy, has produced a few fan wings of the door, when the door wings are designed to swing open in both directions. Later, the revolving door a Swedish manufacturer has launched a new door wings, they are based on the original design of the electric motor and stand adds. At that time also had three-wing doors and four-wing doors. Three-wing revolving door at the airport and the hotel has been very common, smaller doors for hand baggage through the revolving door 4.2 ~ 5.4m diameter more convenient access to the baggage car. Use the four-wing doors higher performance, greater throughput and from abortion. Four-wing revolving door with a diameter of 2m at 10r / min speed, people at normal walking speed per hour in both directions through 10X4X60 = 2400 (people). Four-wing revolving door the most widely used in office buildings and hotels and other places. Five wing door has not been developed, there is still no sales. Proposed in the original patent in the design of two special-purpose: one is movable to the side door; the other is the "break out" donut strong. These designs before folding popular today may have been very popular. Side door and folding mobile combined into one door, the rotary door opened straight increase of nearly 50%, to ensure that in the building of fire, the revolving door is still as fast-track access to the building, to ensure that dangerous under the condition personnel from within the building to escape, doors revolving door is designed to be collapsible, so that each individual leaf when pressed, can loosen or rotate an angle in the opposite direction of rotation, the formation of the channel. Currently, many countries or regions which have a performance area has been included in safety regulations. In the 1940s, the revolving door increases the speed control, the speed of the door so that the required control. With industrialization, automation, automatic doors of various revolving door, with a card reader to identify safety performance of the revolving door, with various security sensors revolving door automatic doors and a number of special-purpose joined the original four-winged door manual Among the series to continue to develop, only now the automatic revolving door. Development of automatic doors not only because of its anti-noise and dust performance, it is important to do its energy-saving features, American Society of Heating, Refrigerating and Air Conditioning Engineers Association in the United States Institute obtained the conclusion is: the revolving door entrance is the most economical efficient building entrance. In 一扇 common diameter 2m, high 2.1m of the revolving door, the drive is only 1.7 cubic meters of air circulation during each pass. Since the amount of heat exchange air is small, and therefore a good energy saving performance of the revolving door. 

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