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Plug type Backward Curved Centrifugal fan - Wheel type L-YFBCPL

● Wheel Specification: 355~1,400
● Volume range: 4000~1,40000 m³/h
● Static pressure range: 200~3,000 Pa
● Temperature: -20~450 degrees centigrade
● High effective backward curved single inlet centrifugal wheel, stable performance, and wide range of high-efficiency area.
● The INFINAIR bearing box is configured as a standard form, with a result of higher reliability.
● Balance quality grade up to G4.0 ( AMCA 204 ) to reduce noise and vibration.
● Fan wheel and the bearing box and the motor are separated by insulation board for easy maintenance.

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Plug type Backward Curved Centrifugal fan - Wheel type L-YFBCPL

Optimized design

-- wheel uses the advanced technology, Optimized design of CFD flow field simulation for backward cured centrifugal wheel. It means blade section has a certain radian, not a straight line; the angle between air flow direction and blade velocity direction is blunt angle. This type of centrifugal wheel is the most efficiency. Mercury series wheel is higher efficient, produces less noise, and guarantees stable performance compared with backward inclined wheel.

Stress analyze tested
-- Whole wheel is aided design of CAE, Strengthen slots properly located and repeatedly validated to ensure long-term reliability of operation.

Plasma cut, clamp positioned and continuously welded
-- The fan blade is laser cutting, precisely positioned by clamp, and continuously welded. The process guarantees the smooth panel edge, precise welding angle, rigid structure. The stress shall be distributed evenly for stable running at high speed for a long time.

Balance quality grade up to G4.0
-- Each wheel is dynamically balanced to the level of G4.0 (Typical products are balanced to G6.3 only),this would help the wheel running quietly for a long time.

-- Wheel naturally have a peak value on the shaft power curve when motor power is larger than peak value. No matter what operating point it is. It can guarantee safe usage.

Wide performance range of high efficiency
-- This type of wheel has smooth and satiable performance curve and wide working area of high efficiency, effectively avoid the performance loss caused by working point change.


High Reliability
-- Backward curved centrifugal wheel with high efficiency wide and non-overload characteristics to ensure operation more safely.
-- To be adopted FEA-aided stress and vibration analysis design for high strength and small vibration, bring about a result that long-time running more stable. 
-- When the temperature of -20-250℃, the fan flow surface (impeller、 optional volute) adopts the high quality carbon steel Q345B; When the temperature of 250-450℃, the fan flow surface adopts 304 stainless steel.
-- The bearing holes both sides of the box body were processed once, therefore the bearings coaxial degree are good, and the bearing life is long to ensure long-term continuous operation.
-- Insulation board, protect transmission from the influence of high temperature condition, improve the transmission group life.
-- Fan shaft is subjected to finish turning & hardening and tempering. Maximum load surpasses 35% of limit speed;

-- Belt drive: precise and adjustable, selection up to the requirements of design conditions.
-- The motor and bearing box were installed in side of the insulation board for easy installation and maintenance.
-- The bearing box equips with lard cavity to ensure bearings oil bath lubrication, Its cooling effect is very good and application of temperature from -20℃ to 450℃.
-- Oil cavity mirror design make fuel oil change intuitive and convenient.

High efficiency
-- Optimized design repeatedly of CFD flow field simulation to ensure aerodynamic performance complied with the flow field characteristics.
-- Standard equipped INFINAIR bearing box, the shaft damage is small and the transmission efficiency is higher.
-- Venturi inlet design as optional matched front disc precisely to avoid turbulent flow and air leakage ,so that the air flow more smoothly to improve aerodynamic performance.
-- The volte design as optional to further improve efficiency. The fan efficiency grades up to FEG80 (AMCA 205). 


Naming Convention:

Tech Spec

YFBCPL Technical Specification

Fan Type
The fan shall be single inlet with steel backward curved centrifugal wheel. The drive type shall be belt drive. Structure of the fan shall allow convenient withdrawal of the wheel for maintenance and cleaning.

Quality Standards 
The fan shall be tested in accordance with AMCA Standard 210 and 300. The manufacturer must own the production license for industrial products and ISO9001 quality system authentication.

The wheel shall be steel backward curved centrifugal and fully welded. The wheel shall be statically and dynamically balanced to level G4.0 in accordance with AMCA204 Standard. When the wheel is operating at the highest allowable speed, the volume shall be stable and the noise shall be low. Wheel features shall be able to avoid performance downgrade resulting from sliding of the working points. Wheel material shall be Q345 for the temperature between 60 and 250 degrees centigrade, and 304SS for the temperature between 251 and 450 degrees centigrade to ensure the wheel’s strength and no creep deformation in high temperature and high speed running in working condition.

Fan Housing (optional)

Housing of the fan shall be made of steel. Its thickness and strength shall be able to bear the maximum operation weight of the fan. Housing of the fan shall be made through continuous welding. The housing of the fan must be equipped with a manhole for removing of foreign matters entering the fan.

Inlet (optional)
Fan inlet shall be steel and aerodynamic design round curved section to smoothly transit the air to the wheel cone, it will have well commutate effect to effectively reduce turbulence, improve fan efficiency and reduce noise.

Transmission Device

The fan shaft shall be treated through soaking furnace to the hardness of HB250 to 280. The maximum velocity shall be designed to at least exceed 35% of the maximum fan operation speed. When the working condition between 60 and 250 degrees centigrade, the shaft material shall be adopted 40Cr. When the working condition between 251 and 450 degrees centigrade, the shaft material shall be adopted 35CrMo. The support structures shall be whole drum-type bearing box with oil deflector inside. The bearing grease shall be molybdenum disulfide and the adding quantity according to the oil amount on space 1/2 ~ 1/3. The service life of the bearing shall be more than L10:80000h. Bearing box near the volute end must be equipped with a wind wheel, wind round the use of light weight, fast heat dissipation aluminum casting. The pulley shall be constructed of cast-iron; Fan pulleys shall be sized for a minimum of 130% of driving power. The pulley and belt shall be furnished with cover.

Insulation Layer

Fan shall be equipped with insulation layer to insulate flue gas temperature outward transfer effectively. Internal insulation layer shall be filled with aluminum silicate cotton. The thickness of insulation layer is 100mm when the working condition below 250 degrees centigrade, and 150mm when the working condition between 251 and 450 degrees centigrade.

Fan surface shall be polished and cleaned up to remove particulates, welding slag, burrs, sharp edge, iron, oil, then epoxy coating or high temperature coating for high temperature environments use, fan surface shall be free of sags, wrinkle, blisters, exposed metal or peeling after coating. It shall be no corrosion and rust at least 10 years in allowable working condition. 

Motor shall be carefully matched to the fan load, IP54, and insulation class F. Motor bearings shall be lubricant ball type. Motor and drives shall be out of the air stream to avoid grease or dirt accumulation.


Permanently fixed aluminum nameplate shall be fixed on fan body clearly display fan mark, product model and serial number (i.e.: unique ID for each fan), so that the customer can use this number to find out the parts used. 

Acceptable Manufacturers
Qualified suppliers shall have an AAA credit rating. Providing INFINAIR or similar products, with their design based on YFBCPL models of INFINAIR.

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