The motor power required for a centrifugal fan means that under certain operating conditions, the power required for the centrifugal fan and the wind box is fully opened when the air inlet is fully open. If the air inlet is fully open for operation, the motor may be damaged. It is best to close the valve on the inlet or outlet pipe of the fan during the test run of the fan, and then gradually open the valve after the operation until the required working conditions are reached, and pay attention to whether the running current of the fan exceeds the rated current. When the centrifugal fan reaches normal speed, it should be measured whether the fan input current is normal, and the operating current of the centrifugal fan cannot exceed its rated current. If the operating current exceeds its rated current, check whether the supplied voltage is normal.
The centrifugal fan is essentially a variable flow constant pressure device. When the speed is constant, the theoretical pressure-flow curve of the centrifugal fan should be a straight line. Due to internal losses, the actual characteristic curve is curved. The pressure generated in centrifugal fans is greatly affected by changes in intake air temperature or density. For a given intake volume, the lowest pressure is generated at the highest intake temperature (lowest air density). For a given pressure and flow characteristic curve, there is a power and flow characteristic curve. When the blower is running at a constant speed, for a given flow, the required power increases as the intake air temperature decreases.
Centrifugal fans are a very common device, and we may see them in many cases. For example, ventilation, dust extraction 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 appliances; grain Drying and delivery; you can see the style of centrifugal fans in the wind tunnel wind source and hovercraft inflation and propulsion. The ancestor of the centrifugal fan is called the fan, long ago, long ago, in China, many years before BC, there was a simple wooden windmill. In fact, it is the grandfather of a centrifugal fan. Its principle is basically the same as that of modern centrifugal fans.
Centrifugal force balancing machines can be divided into soft supporting balancing machines and hard supporting balancing machines according to different supporting characteristics. The balance speed is higher than the natural frequency of the rotor-supporting system. This kind of balancing machine has a small support stiffness, and the signal detected by the sensor is proportional to the vibration displacement of the support. The balance speed lower than the natural frequency of the rotor-supporting system is called a hard-supported balancer. The balancer has a large support stiffness, and the signal detected by the sensor is proportional to the vibration force of the support. The centrifugal fan impeller can be divided into two types: a backward inclined centrifugal impeller and a forward inclined centrifugal impeller according to the installation direction of the impeller blade. According to the impeller structure, the impeller can be divided into two types: multi-wing impeller and sub-wheel. According to motor installation requirements, it can be divided into outer rotor impeller and inner rotor impeller.
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