First, the definition of centrifugal fan:
A centrifugal fan is a machine for tightening and transporting gas. From the point of view of energy, it is a kind of mechanical energy that transforms the mechanical energy of the original motive into the gas energy.
Two. The composition and structure of centrifugal fan
1. the composition of the centrifugal fan:
The centrifugal fan adopts the single suction D type transmission structure, and the centrifugal fan and the motor are connected by a coupling. The centrifugal fan body is mainly composed of the shell, inlet, rotor group (impeller and spindle), bearing box, coupling and so on. (F type transmission, it is double support two bearing box, single suction has an air inlet room, double suction two air intake room. The C, B type drive has the active wheel and the passive wheel. In addition to the centrifugal fan, the unit can also be equipped with all kinds of external accessories according to the needs of the user, such as motor, conditioning door, all support, electric actuator, muffler and so on.
2. introduction of the structure of centrifugal fan:
2.1 centrifugal fan can be made into two types of rotating or reversing: from one side of the motor, if the impeller is rotating clockwise in the direction of clockwise, it is called CIS centrifugal fan, and the reverse centrifugal fan is rotated in the direction of counterclockwise, and it is "inverse". The exit orientation of the centrifugal fan shows that the "Shun" and "reverse" can be made into six viewpoints of 0, 45, 90, 135, 180 and 225 degrees. Other special viewpoints can also be made according to the requirements of users.
According to the detailed situation, the bearing box has two kinds: (1) water cooling bearing box (2) oil cooling bearing box.
Three. Repair and maintenance of centrifugal fan
Proper protection and maintenance is an important guarantee for the safe and reliable operation of centrifugal fans and improving the service life of centrifugal fans. Therefore, in the use of centrifugal fans, it is necessary to cause enough attention.
3.1. impeller repair, maintenance in the initial stage of the impeller operation and all time to view the time, only a chance, it is necessary to see whether the impeller presents cracks, wear, dust and other shortcomings. Only possible, it is necessary to keep the impeller clean, and regularly use steel wire brush to the dust and rust and so on, because of the lengthening of the operation time, these dust can not be evenly attached to the impeller, and formed the impeller balance damage, causing the transfer of Zi Zhendang. The impeller only needs to be repaired, so it needs dynamic balancing. If conditions permit, we can use portable test balance to balance at the scene. Before moving balance, it is necessary to see if all the tightening bolts are tightened. Because the impeller has been working under unbalanced conditions for some time, these bolts may be loose.
The repair and maintenance of the 3.2. casing and the intake chamber can be used to check whether there is serious wear in the interior of the casing and the intake chamber, and in addition to the accumulation of serious dust accumulation, these parts can not be repaired in particular. Check the fastening bolts of all the fasteners regularly, and press the butterfly spring on the bottom to the height of the set of the drawing. say
The repair and maintenance of the 3.3. bearing section often looks at the oil supply condition of the bearing lubricating oil. If the tank is leaking, the bolt can be tightened up a little. If it is not possible, it may have to be replaced with a new sealing packing.
The repair and maintenance of other supporting equipment of 3.4., including motor, electric actuator, instrument, instrument, etc., are detailed in the respective application instructions. These application storytelling are supplied by all the supporting manufacturers. The production plants are randomly supplied to these users.
When the centrifugal fan is stopped to use when the 3.5. centrifugal fan is stopped, when the ambient temperature is below 5 C, the residual water of the equipment and pipeline should be released to prevent the freezing equipment and pipeline.
3.6. centrifugal fan for long term parking service maintenance when not in use (1) put the rust bearing oil on the surface of bearings and other principal components to avoid rust. (2) every half of the rotor of the centrifugal fan should be manually moved with a rotating half circle (180 degrees) manually, and a symbol should be made at the end of the rotor before moving, so that the original point is located at the bottom of the rotor.
Note: the type of bearing of the centrifugal fan is detailed in the general drawing.
Four: the cause of the fault in the operation of the centrifugal fan
The 4.1. centrifugal fan is violent:
The 4.1.1. centrifugal fan shaft is not the same as the motor axis.
The stiffness of the 4.1.2. base or all the stents is not good.
4.1.3. impeller bolts or rivet loosening and impeller deformation.
4.1.4. impeller shaft disc hole and shaft cooperated loosening.
The bolts of the 4.1.5. housing, bearing seat and bracket, bearing seat and bearing cap are loosened.
4.2. bearing temperature rise is too high:
4.2.1. bearing box oscillating violently
4.2.2. grease or oil poor quality, metamorphosis and dust, sand, dust or other impurities or filling volume is not appropriate.
The 4.2.3. shaft and the rolling bearing device are tilted, and the two bearings are not concentric.
4.2.4. rolling bearing outer ring rolling. (conflict with the bearing box).
4.2.5. rolling bearing inner ring relative to spindle rolling (i.e. running inner ring and spindle conflict)