The working principle and performance of the centrifugal cooling fan
Centrifugal cooling fan is through the mechanical energy to increase the gas pressure, and then the gas out of the mechanical transmission, is one of the big four in dedusting ventilation system, a more sophisticated operating machinery, rely on the rotation of the impeller, negative pressure is formed within the cooling fan, the gas suction and discharge the cooling fan impeller passage and volute. Centrifugal cooling fan is a kind of impeller machinery, widely used in energy, environment, aviation and other fields, is one of main energy consumption equipment in industrial and agricultural production. Centrifugal cooling fan is mainly composed of casing, impeller, shaft, bearing housing, current collector, vent, coupling, pulley, and the base and other parts. The working principle of the centrifugal cooling fan: 1, centrifugal cooling fan is according to the kinetic energy is converted to potential energy principle, the use of high-speed rotation of the impeller speed, the gas and in the cooling fan casing to slow down, change flow direction, to the kinetic energy is converted into pressure. 2, centrifugal cooling fan is depending on the input mechanical energy, improve the gas pressure side by side to send the machinery of the gas, it is a kind of driven fluid machinery. 3, the working principle of the centrifugal cooling fan and the turbine compressor are basically the same, but due to the low gas flow rate, pressure changes small, generally does not need to consider the change of the gas volume, namely the gas as incompressible fluid. The performance of centrifugal cooling fan: ( 1) Centrifugal cooling fan performance curve and application: centrifugal cooling fan belongs to vane cooling fan, 'bully', when hours in pipelines, the flow become bigger; When pipelines is big, the flow decreases. For a centrifugal cooling fan, especially its performance curve. Usually, centrifugal cooling fan performance curve as shown in the figure below. Abscissa is flow shaft power increases with the flow, the flow rate, the greater the cooling fan motor current is larger; That is to say, for grate cooler cooling cooling fan, generally speaking, when the material layer thickness increases, the flow of the cooling fan will decrease, when the motor current decreases; On the other hand, the material thickness decreases, and the cooling fan flow rate increases, the motor current will increase. The cooling fan static pressure, total pressure and decreased with increment of traffic (basically Because the cooling fan power must be effectively, the cooling fan is inversely proportional pressure and flow must all) Cooling fan total pressure efficiency, which is a effective power cooling fan and shaft power ratio, its with the increase of flow rate, the present first increases and then phenomenon, is a high efficiency. This is the cooling fan selection basis! As for grate cooler cooling cooling fan, when determine the flow rate, pressure, can choose the flow rate and pressure corresponding to the pressure of high efficiency cooling fan. Because the cooling fan is a high total pressure efficiency, cooling fan static pressure, total pressure and not with the increase of flow straight to reduce, but first increases then decreases. At present, according to the enterprise actual situation, to customize the cooling fan, is the development direction of the cooling fan. （ 2) Centrifugal cooling fan performance curve and the pipeline characteristic curve for the cooling fan characteristic curve and the curve of the pipeline characteristic curve together, the abscissa for traffic, the vertical pressure. The cooling fan characteristic curve of pressure - Flow curve, as the figure in the dark of the line, namely with the increase of horizontal flow, showed a trend of decrease. The pipeline characteristic curve for the parabolic ( The reason is that resistance = 0. 5 * * density velocity squared) That figure in the three curves E1, E2 and E3. Pipeline characteristic curve and the cooling fan characteristic curve of intersection is the working point of the cooling fan ( How to keep the working point in the cooling fan all the scope of the pressure of high efficiency is the key of the cooling fan when the choice! ） In the pipeline characteristic curve of E1, E2 and E3 difference is the difference between a parabolic curve ( y = ax2 + c) , a, the greater the parabola opening is smaller, the faster the pressure with the increase of flow rate. That is E1 and E3, compared to its a bigger, show that the bigger the pipeline resistance, such as the opening of the cooling fan is smaller. Opening of centrifugal cooling fan, small increases, a parabola opening smaller, when the cooling fan working point change ( By the figure in the A3, A1) , namely the flow decreases, the pressure goes up. For conversion and the cooling fan, when the frequency changes, the curve and E1, E3 curve changes significantly different. Chi automotive air conditioning is a set research and development, marketing and after-sales service in a body specialized cooling fan manufacturer. Tong chi car air conditioning is the professional manufacturer of centrifugal, tong chi since entering the field of the cooling fan, always adhere to the cooperation with aviation scientific research units, combining aviation technology and the cooling fan technology, established the company characteristic of science and technology enterprises. Tong chi persist in integrating the essence of the cooling fan equipment both at home and abroad, 'chi' brand, independent research and development into a complete product specifications, production strength, full of potential cooling fan manufacturer, is one of the important production base of domestic cooling fan. The service hotline: in the country.