Beijing centrifugal fan repair / fan balancing

Beijing fan maintenance; centrifugal-Fan, explosion-proof centrifugal fans, axial fan, portable spray cooling fan, air-conditioning fan, kitchen, fire, cupola, low noise, Francis, oblique flow, Roots, mine fan , brick kiln fan, cement kiln fan, wooden conveying fan, Subway fan, fan anti-corrosion and high-temperature fan. The tunnel fan of high-temperature fan blower centrifugal fan axial fan roof ventilation fan cement kiln fan. 1.1 wind turbine installation and commissioning high-temperature fan installation spindle axis thermal expansion of a high-temperature fan, through the non-locating bearing axial swimming implemented. It has been considered in the design of the spindle in the conditions of thermal expansion, usually in the installation drawings will be clearly marked bearing, position size impeller installed. When conducting on-site installation work required attention: (1) According to the expansion direction of the spindle selected as the positioning end load side; (2) to determine the orientation and non-locating bearing based on the difference between the end cap. 1.2 System alignment alignment system including: a center bearing alignment, fan shaft and motor alignment. To avoid thermal state of "false to the" high-temperature fan looking for the parts being must be carried out at room temperature. Installation from the bearing lubrication station 1.3 Installation of wind turbine lubrication station not too far away, in order to avoid high temperatures prevail. Lubrication station is too far will lead into the oil return pipe passing through a long, large fluid losses along the way, and prone to bearing into the oil pressure is insufficient, poor oil return, bearing oil leakage and other faults (especially in the winter cold to open the vehicle The case most likely to occur). Commissioning medium density 1.4 at room temperature is greater than the actual working conditions of many. Thus, cold test temperature fan, you must ensure that the inlet air damper is closed, diagnosis and treatment of the fan vibration 2 2.1 Troubleshooting excessive hot air operation is the most common failure is the impact on the safe operation of the fan and factory normal production an important factor. Fan vibration causes are many common causes: a rotor imbalance, the system of bad, loose, Stator friction, bearing failure, rotor bending, resonance, electrical failure caused by fan vibration. 2.1.1 Heaters rotor imbalance rotor imbalance causes and treatment of the most common causes of excessive turbine vibration. Simple rotor unbalance vibration characteristics Obviously, their performance: (1) approximately sinusoidal waveform; (2) spectrum, the harmonic energy is concentrated at the fundamental frequency. Since the sintering plant, pellet plant process Heaters special working environment, leading to fan rotor imbalance factor is relatively complex. Pelletizing Plant Heaters rotor imbalance common causes and treatment in Table 1. 2.1.2 simple method to judge several other common vibration fault in Table 2. 2.2 bearing temperature high bearing temperatures run high hot air is a common fault, the reason a lot, but in terms of high-temperature fan, including six aspects: (1) serious bearing wear, axial and radial clearance is too large. This is mainly used for too long bearings, ball and cage and other badly worn and need replacing; less (2) the amount of lubricant or excessive. Mostly hot air circulating oil lubrication, hydraulic and lubrication oil station has a great influence on the bearing temperature, oil lubrication oil station oil temperature generally does not exceed 40 ℃. Oil filter should be cleaned regularly. Meanwhile, the inlet pipe and the return pipe from the cabinet should not be too close to the ambient temperature to avoid the effects of radiation oil; (3) oil grade metamorphic or not, the viscosity is too low or too high. The best general high temperature fan oil replaced every six months, and the grades of 32 # or 46 # appropriate (or strictly in accordance with the instructions required to select equipment lubricants); (4) the ambient temperature is too high. High-temperature fan bearing temperature with the ambient temperature fluctuation is large, resulting in an unstable process operation on the air temperature instability, thus affecting the bearing temperature is frequently encountered problems; (5) Installation errors. Both ends of the bearing mounting misalignment or positioning of the spindle installation error, resulting in non-locating bearing cover and bearing outer ring gap is too small, the back spindle thermal expansion, bearing outer ring with the cap, and this will lead to bearing friction heat; ( 6) bearing outer ring rotation and bearing friction inside the hole. Table 1 Heaters common cause of rotor imbalance and imbalance common causes of dust processing method ineffective treatment system serial number, the impeller uneven wear, leading to 1. If the impeller rotor unbalance the overall wear and tear is not serious, you can move directly through the site balance, to solve the problem; 2. If the impeller overall wear is more serious, blade wear layer has been rubbed off more than 2/3, to avoid further wear and cause the entire impeller scrap, preferably before surfacing wear layer, and then move on site balanced approach. This repetitive work, you can extend the life of nearly 1 times the impeller. Welding electrodes can be selected according to the blade base material, material. In addition, the site should be chosen and the thickness of the cladding layer according to the fan inlet structure to improve welding quality. For example, both sides into the wind turbines, the most dramatic part of the wear in the middle of the blade, weld surfacing layer here should be dense and thick, which can effectively improve the wear cycle 2 in the flue gas ash deposited on the back of the blade, resulting in This imbalance is common faults of hot air pellet plant. Impeller clean to eliminate vibration resistant liner 3 detachable blade retaining bolts fall off if the fan blades wear layer is detachable before the dynamic balance of the fan, be sure to double-check each impeller a bolt, to re-tighten the loose and spot welding, it would be difficult to eliminate vibration through the field balancing.