LKB series of forward curved multi-bldes centrifugal fans are low noise and compact structure fans which are developed with advanced technology, adopting external rotor motor direct drive. The fans are characterized by high efficiency, low noise, large air flow, small size, compact structure. They are ideal subsidiary equipment for cabinet air-conditioning units, variable air volume(VAV) air conditioner, and other heating, air- conditioning, purification, ventilating equipment. 
Specification
1. Impeller Diameter: 200 ~500mm. 2. Air Volume Range: 1000~20000m3/h. 3. Total Pressure Range: 200~850Pa 4. Sound Range: 60~84 dB(A). 5. Drive Type: External rotor motor direct drive. 6. Model: 200, 225, 250, 280, 315, 355,400, 450, 500. 7. Applications: Ideal subsidiary equipment for cabinet air-conditioning.units, variable air volume(VAV) air conditioner, and other heating, air-conditioning, purification equipmentType of Product
1)Direction of Rotation LKB Series ventilator can be devi ded into two direction of rotations, left-hand rotation(LG) and right hand rotation (RD); Viewing from motor outlet terminal, if the impeller rotates clockwise, it is called right hand ventilator; If the impeller rotates anti-clockwise, it is called left hand ventilator. 2)Direction of Air Outlet According to Fig 1, LKB Series ventilator can be made in four air-outlet direc- tions:0°, 90°, 180°, 270° ,
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Construction of Product
LKB Series ventilator consists of scroll, impeller, baseplate (frame), motor, shaft sleeve and air outlet flange. 1)Scroll The scroll is made of high quality hot-galvanizing steel sheet. The side plates take the shape according to aerodynamics and make the ventilator volume minimum. On the air inlet of side plate there is an air-inlet to make the air stream enter the impeller without loss. The snail plate is fixed on the side plates by way of spot welding or biting as a whole. On the side plate of the scroll there are a series of holes drilled in advance for riveting nuts to carry out installation according to air outlet direction needed by the customer. 2) Impeller The impeller is made of high quality hot galvanizing steel sheet and is de signed to a special configuration according to aerodynamics to make the efficiency highest and the noise lowest.The impeller is fixed on the middle disk plate and on the end ring with riveting grippers. The impeller has enough rigidity during continuous rotation with maximum power.Before leaving factory, all impellers have passed all-round dynamic balance test according to the Company Standard which is higher than National Standard. 3) Baseplate (Frame) LKB Series ventilator baseplate is made of high quality hot galvanizing steel sheet. The direction of baseplate installation can be carried out according to the different requirements of customers.Over LKB 315 ventilator frame is made of angle steel and flatsteel. On four sides of the frame there are holes drilled for installation to meet customers requirements in different installation directions. 4) Motor The motor used in LKB series fans are low noise three phase asynchronous motors with external rotors. The impeller is installed on the external casing of the motor. The motor rotation speed can be changed by using provided with three -phase voltage regular, silicon controlled. Voltage regulator, frequency converter and etc. to satisfy changeable load in system. 5) Flange The flange is made of hot galvanizing angle steel. The connection of angle steel straps and the connection between flange and scroll are carried out by using TOX non-welding technology, thus obtaining fine appearance, enough rigidity and strength. The dimensions and type of flange are shown in Fig2.
Performance of Ventilator
1)The ventilator performance in this catalogue denotes the performance in standard conditions. It denotes air inlet conditions of ventilator as follows: Air inlet pressure Pa = 101.325KPa Air temperature t = 20lD Inlet gas density p = 1.2Kg/m3 If the practical air inlet conditions of customer or the speed of the operating ventilator changes,the conversion can be carried out according to the following expression:
where: 1) Volume Qo(nWh), total pressure Po( Pa), speed n( r/min), and Nino( kw) can be obtained from Performance chart. Asterisk (*) on the upper right corner denotes the performance parameter needed by the customers in practical gas inlet conditions. The difference in relative humidity is omitted from the above-mentioned formulas. 2) The performance of the sample ventilator is tested in accordance with GB1236-2000. Its noise index is measured according to GB2888-1991 at the point 1 metre from the inlet Asterisk (*) on the upper right comerdenotes the performance parameter needed by the customers in practical gas inlet conditions. Instructions
1)Matching electric motor power of ventilator denotes internal power plus safety coefficient of electric motor capacity in special operating condition, it does not denote the power required during full opening of air outlet. Therefore no-load running of ventilator without any applied resistance is strictly prohibited in order to avoid burning out of the motor caused by its operation at over rated power. 2)This fan is restricted for use in areas where air substances are non-corrosive, non-toxics and non-alkaline or where dust parties <150mg/m3,-10°C < temperature < 40°C. If special conditions during transportation, load and unload, it is strictly prohibited to shock the ventilators. 3) Prior to installing ventilator, rotate the impeller by hand or stick to check for tightness or impact. If it is ensured that there is no tightness and impact, then the installation can be carried out. 4)Soft connection between air pipe and ventilator air-inlet and outlet should be made as possible. The joints should not be tightened too much. 5)After installing, the ventilator, the scroll of ventilator should be inspected. There should not be tools and extra matters remained in the casing. 6)Prior to official operation of ventilation, it is necessary to check the rotating direction of both motor and ventilator for their coordination. 7)During ordering it is necessary to state the type of ventilator, speed, air volume, air pressure, direction of air outlet, rotating direction, type of electric motor and its specifications.
