What factors will cause high energy consumption of centrifugal fan?
What factors will cause high energy consumption of centrifugal fan?
There are many factors leading to high energy consumption of centrifugal fan, including other aspects in addition to its own quality problems. If analyzed in combination with the actual application, the actual energy consumption of centrifugal fan is often caused by the obvious difference between its actual working point and the expected high – efficiency working point.
In the process of actual operation of centrifugal fan, if the safety margin set by the staff is too large, or just blindly its high-grade performance area, it will undoubtedly make the rated air volume of the fan exceed the performance required by the actual work, which will naturally lead to the increase of energy consumption.
In order to meet the needs of work, staff often choose the way of throttling to increase the operation resistance of centrifugal fan equipment, which will further increase the energy consumption of equipment and reduce the use efficiency. These are non manufacturing factors that lead to high energy consumption of centrifugal fan.
Of course, it is also possible that the power of centrifugal fan equipment and supporting motor selected by users is too large, but the actual use demand is ignored, which will also cause great waste. In addition, in the process of installing centrifugal fan equipment, the improper design of the selected pipeline system will increase the resistance of the pipe network of centrifugal fan equipment, and then increase its energy consumption, resulting in the decline of service efficiency.
When the centrifugal fan is in operation, the regulation mode is unreasonable, which will also reduce its working efficiency and increase energy consumption. In addition, the energy consumption of centrifugal fan is also related to daily management. If the management process is not proper, it will also cause a waste of electric energy.
1. Working principle of centrifugal blower when the motor rotates to drive the fan impeller to rotate, the gas between the blades in the impeller also rotates, and these gases are thrown out under the action of centrifugal force. The gas flow rate increases, so that the kinetic energy of the gas is converted into static pressure energy in the flow, and then with the pressurization of the fluid, the static pressure energy is converted into velocity energy, and the gas is discharged through the exhaust port, A certain negative pressure is formed in the middle of the impeller. Due to the negative pressure at the inlet, the external gas is immediately supplemented under the action of atmospheric pressure, and the gas is continuously discharged and supplemented under the continuous rotation of the impeller, so as to achieve the purpose of continuous blowing. Under the same power, the air pressure and air volume are generally inversely proportional. Under the same power, if the air pressure is high, the air volume will be relatively low, while if the air volume is large, the air pressure will be lower, so as to make full use of the efficiency of the motor.
2. Working principle of Roots blower and roots blower: Roots blower is a positive displacement fan, and the air volume transported is proportional to the number of revolutions. Each time the three blade impeller rotates, two impellers are used for suction and exhaust three times. Compared with the two blade impeller, the gas pulsation is less, the load change is less, the mechanical strength is high, the noise is low, and the vibration is also small. Two three blade impellers are arranged on the two parallel shafts. A small gap is always maintained between the wheel and the inner hole surface of the oval box and each impeller. Due to the uniform rotation of the impellers in the opposite direction, a certain amount of gas surrounded by the box and the impeller is transmitted from the suction side to the discharge side. Each impeller is always kept in the correct phase by the synchronous gear and will not touch each other. Therefore, it can be high-speed without internal lubrication. Moreover, it has the advantages of simple structure, stable operation and stable performance. It is suitable for a variety of purposes and has been used in a wide range of fields.
1) Generally speaking, roots blower has large air volume and pressure. Similarly, roots blower has great noise. If the air volume is small and the noise requirements are high, rotary blower is selected. Rotary blower also belongs to constant flow fan. The main working parameter is air volume. The output pressure changes with the change of pipeline and load, and the change of air volume is very small, Rotary fan is variable volume compression, which is mainly characterized by low speed, low noise, low vibration, high efficiency and high energy saving. Click here to browse pictures in the new window, especially recommended: low noise, oil-free, YH environmental protection fan.
2) If the load needs constant flow effect, use roots blower. Because roots blower belongs to constant flow fan, the main working parameter is air volume. The output pressure changes with the change of pipeline and load, and the change of air volume is very small. Roots blower is a kind of high-pressure fan. Roots blower is a positive displacement fan. The delivered air volume is proportional to the number of revolutions and transports the gas from the suction side to the discharge side. If the load needs constant pressure effect, centrifugal fan is used. Because the centrifugal fan is a constant pressure fan, the main working parameter is air pressure. The output air volume changes with the change of pipeline and load, and the air pressure changes little. Centrifugal fan with small air pressure. The compression process of air is usually carried out by several working impellers (or stages) under the action of centrifugal force. The centrifugal fan belongs to the square torque characteristic, while the Roots fan basically belongs to the constant torque characteristic.
Working principle of Roots blower
Roots fan is a positive displacement fan, and the air volume conveyed is proportional to the number of revolutions. Each time the three blade impeller rotates, two impellers carry out suction and exhaust for three times. Compared with the two blade type, the gas pulsation is small, the vibration is small and the noise is low. There is always a small gap between the impeller on the two shafts of the fan and the hole surface in the oval shell, between the end face of the impeller and the front and rear end covers of the fan and between the impeller of the fan. Driven by the synchronous gear, the wind is transmitted from the air inlet of the fan to the discharge side along the inner wall of the shell. The inner cavity of the fan does not need lubricating oil. It has the advantages of simple structure, stable operation and stable performance. It is suitable for a variety of purposes and has been used in a wide range of fields.
Due to the adoption of three blade rotor structure and reasonable structure at the air inlet and outlet in the shell, the fan has small vibration and low noise- T# j8 E2 W: y6 t+ t7 ^% A
The impeller and shaft are of integral structure, and the impeller is free of wear. The performance of the fan remains unchanged for a long time and can operate continuously for a long time.
The fan has large volume utilization rate, high volume efficiency, compact structure and flexible installation mode.
The selection of bearings is more reasonable, and the service life of each bearing is uniform, which prolongs the service life of the fan!
The fan oil seal is made of imported fluororubber material, which is high temperature resistant, wear-resistant and long service life.
The models are complete, which can meet the needs of different users for different purposes.
Centrifugal fan is a kind of driven fluid machinery, which depends on the input mechanical energy to increase the gas pressure and discharge the gas.
Centrifugal fans are widely used in ventilation, dust removal and cooling of factories, mines, tunnels, cooling towers, vehicles, ships and buildings; Ventilation and induced draft of boilers and industrial furnaces; Cooling and ventilation in air conditioning equipment and household electrical appliances; Drying and selection of grain; Wind tunnel wind source and inflation and propulsion of hovercraft.
The working principle of centrifugal fan is basically the same as that of turbine compressor, but because the gas flow rate is low and the pressure changes little, it is generally unnecessary to consider the change of gas specific volume, that is, the gas is treated as an incompressible fluid.
Roots blower is a constant flow fan. The main working parameter is air volume. The output pressure changes with the change of pipeline and load, and the change of air volume is very small.
Centrifugal fan belongs to constant pressure fan. The main working parameter is air pressure. The output air volume changes with the change of pipeline and load, and the air pressure changes little.