The design of the backward curved centrifugal wheel is optimized through CFD simulation and conforms to the aerodynamic characteristics, ensuring great efficiency and smooth airflow.
The blades use plasma cutting technology, high-precision fixtures and are all-welded. They have smooth edges, high strength and great reliability for long-term high speed operation with evenly distributed stress.
Each wheel undergoes dynamic balancing tests and reaches G4.0 grade balancing level (whereas common products have only G6.3 level). This high balancing level has ensured the stable, durable and quiet operation of YFBCSI fans.
The aerodynamic performance curves of the wheel are stable and flat, suitable for various operating conditions of high efficiency. Performance decline can be avoided as the operating point moves.
There is a peak motor shaft power of the YFBCSI fan. After the motor is selected based on the peak shaft power, motor power and motor service factor, the motor shaft power will not exceed the rated power as the fan runs. The customers in using this product need not worry about it.
The YFBCSI fan shall be SISW centrifugal fan mounted with steel backward curved wheel. It shall be direct, coupling or belt driven. The fan structure shall allow the wheel to be taken out for maintenance or cleaning.
Tests shall be performed on YFBCSI fans and certificates obtained under AMCA Standard 210 & 300. The manufacturer shall have the Production License for National Industrial Products and get the ISO9001 certification.
The steel wheel shall be all welded and be of the backward curved centrifugal type. The wheel shall undergo static and dynamic balancing tests and reach AMCA 204- G4.0 balancing level. At the highest running speed, the wheel shall produce smooth airflow and low sound. The decline in fan performance shall be prevented. When the temperature is below 60℃, the material shall be Q235; Q345 for temperature range 61℃~250℃ and 304 stainless steel for temperature range 251℃~450℃. Through using these materials, the wheel has high strength and will not warp in high speed operation.
The fan housing shall be made of steel and the thickness of the housing shall be able to support the fan’s maximum weight in operation. It shall be continuously welded and there shall be an access door to get any foreign bodies away.
The inlet shall conform to aerodynamics. It shall have streamlined design to allow for smooth airflow, less turbulence and low sound.
The fan surface shall be polished so that no protuberances, welding spatters, burrs, sharp edges, scrap iron and greasy dirt can be found. Then electrostatic epoxy coatings or high temperature resistance coatings shall be applied. The surface shall be a level one without sags, cracks, cockles or detachment.
Heat treated through soaking furnace, the shaft shall reach the hardness level of HB250～280. It shall have its load designed at least 35% more than the maximum running speed of the fan. The shaft shall have shaft cover. When the temperature is below 250℃, the fan shaft material shall be 40Cr and 35CrMo for temperature range of 251℃~450℃. The bearings shall have a minimum L10 life of 80, 000 hours at the maximum cataloged speed. N32~N46 lubricant shall be used for the bearing. For temperature range of 61℃~250℃, water cooling device shall be adopted. For temperature over 250℃, water pipes shall be utilized. Sealed and lubricated under normal temperatures, the belts shall have pulleys of cast iron type with a size of at least 130% of the driving power. The pulley and belt shall have guard for protection and there shall be flexible coupling. The transmission efficiency and factor of safety of torsion shall meet the design requirements of fans.
There shall be a close match between the motor and the fan load. The motor shall have a degree of protection standard IP54 and an insulation class F. Its bearing shall be of ball type that can be lubricated. To avoid grease or dirt accumulation, the motor and drive unit shall be located out of the airstream.
The fan shall include Spark C spark resistance construction. At the inlet, there shall be copper ring. Explosion-proof motor shall be used. The fan shall be CNEX certificated and the manufacturer shall obtain the production license for explosion-proof electric products.
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