Analysis of centrifugal fan, centrifugal blower and exhaust blower

Centrifugal fans, as a general term for the fan, include centrifugal fan, centrifugal blower and exhaust blower. In terms of basic structure are: the impeller, casing, shaft coupling, etc. the main equipment components, the working principle is: the impeller is the main power components have wind and energy transfer; housing mainly used to introduce gas and exhaust gas, and part of the kinetic energy into gas pressure can be used to connect the motor and the wind coupling; machine, torque.

Centrifugal fan: can be divided into three grades in high pressure low pressure, commonly used products are 4-72 series centrifugal fan, 4-79 series centrifugal fan, 8-09 high-pressure centrifugal fan, 9-19 high-pressure centrifugal fan, 9-28 high-pressure centrifugal fan, the fan are general purpose fan series. Centrifugal fan is to rely on the input of mechanical energy, improve gas pressure side by side to send gas machinery, it is a driven fluid machinery. Widely used in factories, mines, tunnels, cooling towers, vehicles, ships and buildings ventilation, dust control; cooling and ventilation equipment and household appliances in the air; grain drying and selected; wind tunnel and air inflator and hovercraft propulsion.
Centrifugal blower: centrifugal blower is composed of casing, impeller, air inlet, transmission shaft and base plate. Working principle: when the motor rotates and drives the fan impeller rotates between the impeller vanes in the gas to rotate, and under the action of centrifugal force out of the gas, the gas flow rate increases, the gas converts kinetic energy into pressure energy in the flow, and then with the fluid pressure, the pressure can also convert speed and the exhaust gas through the exhaust port, and the formation of a certain negative pressure in the middle of the impeller, because the entrance pressure is negative, the external gas under the action of atmospheric pressure immediately added, continuous discharge and feeding gas in the impeller under continuous rotation, so as to achieve the purpose of continuous blast. Under the same power, wind pressure and air volume are generally inversely proportional to. Under the same power, the wind pressure is high, the wind will be relatively low, and the wind, the wind pressure will be low, so as to make full use of the efficiency of the motor. Features: low speed, low noise. The highest efficiency is above 86%, and the high efficiency area is wider than the similar products. Reasonable structure, advanced technology, and similar products than small size, light weight, convenient maintenance. The wind rate of this type of fan is larger than that of the centrifugal fan, but the wind pressure is smaller than that of the centrifugal fan, and the temperature is lower than that of the centrifugal fan.

Centrifugal fan: mainly in the boiler fan as the main products, the main types are: GY4-73 type boiler fan, Y5-47 type boiler centrifugal fan, GY6-41 type boiler fan, Y6-51 boiler centrifugal fan, Y8-39 type boiler centrifugal fan etc.. Furnace centrifugal fan is based on the principle of kinetic energy into potential energy, the use of high-speed rotating impeller will accelerate the gas, and then slow down, change the flow, so that the conversion of kinetic energy into potential energy (pressure). Believe that a lot of people on the boiler centrifugal induced draft fan pressure conversion principle is not very understanding, so today we will introduce you to the knowledge of this area. In a single-stage centrifugal fan, the gas enters the impeller from the axial direction, and the gas flows into the radial direction when the gas flows through the impeller, and then enters the diffuser. In the diffuser, the gas changes the flow direction and slows down.

This deceleration will convert the kinetic energy into pressure energy. The increase of pressure mainly occurred in the impeller, followed by the expansion process. In the multi-stage centrifugal fan, the air flow is used to make the air flow into the next impeller, which leads to higher pressure.
Because the draught fan is mostly used in the boiler draught, the wind pressure is bigger, the high temperature resistance degree is higher than the general fan.

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