Tek airfoil impellers combine precision injection molding techniques with modern high strength plastics to produce a wheel that is stronger than steel, yet half its weight. The impellers are press fitted on the external rotor motor and dynamically balanced in two planes. Backward curved blades of high performance and ec motor. The compact design of the xr backward curved motorized ac impeller provides excellent performance for applications with limited space such as plastic extrusion, pharmaceutical equipment, military hrac, clean room modules, electronic cabinet cooling, and much more. This bulletin lists hartzells complete line of series 03 backward curved centrifugal fans and accessories. Centrifugal fans from ebmpapst are available with forward or backward curved blades. This has been the main reason for remarkable improvements in this industry. External rotor motors are usually contained within the depth of the fan impeller, thus saving the space normally occupied by a standard motor. Airhandling efficiencies of the hp backwardcurved fan are higher than common radial fans and, therefore, offer lower noise levels. The main objective of this paper is to show comparison of backward curved impeller with backward inclined airofoil of centrifugal fan. Tubular backward curved centrifugal fans gelec hk limited. The backward curved blade profile empowers these fans to move high volumes of air at high static pressures with high static efficiencies. These impellers are highly resistant to dirt and dust.
Axial and centrifugal fans with ac motor sizes 0941108 pdf 17. Backward curved centrifugal fans feature extre mely long blades. The onepiece, resin transfer molded wheel also contains an encapsulated aluminum core insert for secure attachment to the shaft. Ac centrifugal fan backward curved, single inlet r2e270aa0105 technical features leackage current backward curved impeller with backward inclined airofo il of centr ifugal fan. Fibreglassreinforce pp impeller from 3250, galvanised sheet steel impeler from 250 280, sheet aluminium from. Centrifugal fans with backward curved blades are used primarily for intake suction and do not require a scroll housing. In order to achieve better efficiency, and also the better shape of the fan pressure diagram, fan runner is designed with backwardcurved blades in relation to. Hpbc high pressure backward curved fan new york blower. We understand the rigorous requirements particular to industrial air movement applications.
Manufacturer of centrifugal fan siswcb series forward curved centrifugal fan, didw db series forward centrifugal fan, sisw rc series backward inclined centrifugal fan and centrifugal fan forward curved single inlet offered by dynamic motors india private limited, chennai, tamil nadu. Ec motors is exceed the requirements of erp 20, plus also meets erp 2015. Energy savings, convenient control and minimal noise generation centrifugal fans with forwardcurved blades and greentech ec technology. A typical backward curved centrifugal fan, in which the blades curve away from the direction in which they rotate a centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. The centrifugal fan induces airflow by the centrifugal force generated in a rotating column of air producing potential energy sp and also by the rotational tangential velocity imparted to the air as it leaves the tip of the blades producing kinetic energy vp. The fans are suitable for supply or exhaust applications in commercial and industrial buildings. Backward curved fans have blades with leading edge.
Tek airfoil impellers backward curved continental fan. Backward curved centrifugal motorised impeller design. Dec 11, 2017 fan types why choose a backward curved centrifugal fan. The backwardcurved centrifugal fans have been studied almost the case with the scroll casing. Wheel types centrifugal fans may be classified into three basic types according to blade configuration. General information ac centrifugal, backward ac centrifugal, forward ec centrifugal, backward. Designed for quiet operation, series 03 backward centrifugal curved fans deliver lower sound levels in the highest efficiency ranges.
The centrifugal fan induces airflow by the centrifugal. Centrifugal fans woodcock and wilson fan manufacturers. Series 03 backward curved centrifugal fan hartzell air movement. Sizes of this series are in accordance with amca standard 99009876 r20. Pdf performance analysis and optimized design of backward. High efficiency 220v ac centrifugal blower, industrial cooling exhaust fans. The backward curved centrifugal fans have been studied almost the case with the scroll casing. Centrifugal fans can include either forward curved or backward curved impellers. Backward curved fans can also be applied as housed or unhoused. A typical backwardcurved centrifugal fan, in which the blades curve away from the direction in which they rotate a centrifugal fan is a mechanical device for moving air or other gases in a direction at an angle to the incoming fluid. A wide variety of centrifugal fan backward curved options are available to you, such as certification.
Airfoil blades are the most efficient with the lowest sound levels. Ec backward curved centrifugal fans design external rotor motors are usually contained within the depth of the fan impeller, thus saving the space normally occupied by a standard motor. Ac centrifugal fans backward curved general information. Ac and dc backwardcurve centrifugal fans are high efficiency units available in a wide range of sizes, configurations and materials to meet any ventilation requirement. The width of the blade at the entrance is b 1 22 cm and at the exit is b 2 12 cm. Backward curved fan dc backward curved fans manufacturer. Small high pressure ac centrifugal fan air blower fan with ac motor. The clients are highly satisfied with the performance of backward curved fans, offered by us. The external dimensions of the new centrifugal fan are absolutely identical to those of its predecessor. The best efficiency points at different speeds were obtained. Backward curved fans offer strong performance capabilities with minimal energy costs, making them high value components to many centrifugal fan applications. Pdf comparison of backward curved impeller with backward. Figure 2 illustrates the components that make up a typical centrifugal fan and. Inlet box positions for centrifugal fans reference line is.
Centrifugal impeller with 11 backward inclined steel blades, welded. Fan types why choose a forward curved centrifugal fan. Characteristics of turbulent noise from backwardcurved centrifugal. Curved airfoil, bia t o t a l p r e s s u r e s t a t i c p r e s s u r e s t a t i c e f i i e n c h o r s e y o w e r t o t a l fi ci e n c y percent of free. They are located in the air stream, so temperature is limited, and are generally of protection class ip44, so the air needs to be clean and dry to avoid motor. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The fans we produce are designed and built for users who value quality craftsmanship and reliable performance. Pdf in order to achieve better efficiency, and also the better shape of the fan pressure diagram, fan runner is designed with backwardcurved. Two fan lines, general purpose and square fans, utilize backward inclined wheels. Optimum performance and longevity are at the heart of all of. Series 03 backward curved centrifugal fan hartzell air. Inlet box positions for centrifugal fans reference line is the top vertical axis through center of fan shaft. Centrifugal fans with backwardcurved and forwardcurved.
The centrifugal fans with backwardcurved blades are designed as freewheeling fans and do not require a scroll housing. Characteristics and selection parameters of fans and blower systems 2012 instructor. This type of fan operates stably because the pressure difference provided by the fan drops if the flow rate goes up. The forwardcurved fc fan blades curve into the direction of wheel rotation. Series 41 fiberglass backwardcurved centrifugal fan. Radial fans are industrial workhorses because of their high static pressures upto 1400 mm wc and ability to handle heavily contaminated airstreams. Backward inclined centrifugal ventilators new york blower. We are one of ec fan manufacturers, we provide high quality forward curved ec centrifugal fan and backward curved ec centrifugal fan. In these examples, the correct direction of rotation is clockwise as viewing the fans from the inlet side as shown. Single inlet centrifugal fans backward wheels the bsb series is sisw centrifugal fans with high efficiency nonoverloading backward curved impellers. These backward curved centrifugal fans use backward curved impellers made of steel or engineering plastics. All models shall be fully tested as a complete assembled unit to bs848. Due to the lossreduced flow through the impeller, the radical now enables noisereduced operation. Centrifugal fans with backwardcurved and forwardcurved blades.
When we have defined the volume flow rate that we require, whether this is to provide fresh air or process cooling, we need to combine this with the resistance to flow that the fan will encounter in the application. The impeller is made of cold rolled sheet steel backward curved blades with high efficiency and blades with polyester powder coating finish. Fibreglassreinforce pp impeller from 3250, galvanised sheet steel impeler from 250 280, sheet aluminium from 310400. New york blower highefficiency high pressure backward curved fans feature a backwardcurved wheel designed for cleanair applications, but is still capable of handling light particleladen or moist airstreams. A centrifugal fan moves air and creates pressure partly by centrifugal action and partly by rotating. Backward curved fan centrifugal fan manufacturer from surat. Backward curved centrifugal fans energy efficient axair. The blades of the impeller in a centrifugal fan are backward curved. The series 41 fiberglass backwardcurved centrifugal fan contains a solid fiberglass type fa airfoil wheel.
Each of these types of fans will be compared along with an explanation of the class rating of fans. We are specialists in designing, manufacturing, supplying and servicing a range of industrial fans across the world, and our centrifugal fans are no different. Radial or straight blade each type has its own application range and limits. Fiberglass backward curved centrifugal fans fluid technology. Hvac aystem, various industrial application, forced dratt fan drive arrangment. Backward curved centrifugal fans crpt 89 technical characteristics before intstallation check that product electrical characteristics listed on the data plate label voltage, power, frequency etc match those of the intended electrical supply. New york blower highefficiency high pressure backward curved fans feature a backward curved wheel designed for cleanair applications, but is still capable of handling light particleladen or moist airstreams. Single thickness is best suited for airstreams with light material. The outer and inner diameters of the impeller are d 2 0. Backward curved ec centrifugal fan manufacturer, supplier. Technotech enterprises is a name, which you can count on for obtaining backward curved fans. The lownoise centrifugal fans with forward curved blades are also supplied with a scroll housing. The produced static pressure and air volume at best. Mar 01, 2018 fan types why choose a forward curved centrifugal fan.
The backward incline bi fan is slightly less efficient but similar to the af fan. Xr backward curved motorized ac impeller description. The backwardcurved centrifugal impellers shall be driven by standard tefc motors as nominated. Available with forward or backward curved impeller and ac or dc technology. Centrifugal fans with backward curved blades are used primarily for.
Centrifugal fans from ebmpapst are available with forward or backwardcurved blades. In order to achieve better efficiency, and also the better shape of the fan pressure diagram, fan runner is designed with backward curved blades in relation to the direction of the runner rotation. These simple yet highly effective centrifugal fans generally offer highly efficient and cost effective solutions when operated in clean air or with light dust loads. The centrifugal fans with backward curved blades are designed as freewheeling fans and do not require a scroll housing. Backward bladed, forward curved multivane, high pressure and paddle bladed. Highefficiency, energysaving30%, intelligent, low noise level. Xr backward curved motorized ac impeller continental fan. Both clockwise and counterclockwise rotations are available, and fan sizes from 12 through 33 feature fieldrotatable housings with the discharge adjustable to any of eight amca standard positions.
Filtering ffu ac centrifugal fan with backward curved motorized impeller. Fan curve, backwardcurved centrifugal blade tptotal pressure spstatic pressure tetotal efficiencyq. Backward curved, backward inclined and airfoil impellers have similar performance curves and thus the following backward curved fan information applies to backward inclined and airfoil fans, as well. Pdf centrifugal fans with backwardcurved and forward. The flexline series of backward curved centrifugal fans has been developed for ducted applications requiring high pressures. The lownoise centrifugal fans with forwardcurved blades are also supplied with a scroll housing. The impellers together with the impeller hub are dynamically balanced on two levels with the rotor according to quality level g 2,5 g 6,3 as per din iso 2194011. Manufacturer of centrifugal fan siswcb series forward curved centrifugal fan, didw db series forward centrifugal fan, sisw rc series backward inclined centrifugal fan and centrifugal fan forward curved single inlet offered by dynamic motors. Overall, the whole process simulates backwardcurved airfoil centrifugal blowers effectively and is a powerful design tool for blower development and improvement. Centrifugal fans with backward curved blades ebmpapst. Backward curved centrifugal fans a148 bulletin hartzell air. Fan types why choose a backward curved centrifugal fan.
Backwardcurved centrifugal fan amazon web services. Designed to handle clean air or air with light dust loading, these fans are widely used on the clean side of. These durable, backward curved airfoil impellers deliver fan performance approaching aerodynamic perfection. They are available in various speed options and 8 sizes, extending from 315 to 710mm diameter. The rugged backward curved impeller and robust housing offer favourable features such as corrosion resistant frp construction for all gas contact parts, high. Centrifugal fan centrifugal fans made by ebmpapst with. It convinces with a higher air output and improved efficiency. Centrifugal fan siswcb series forward curved centrifugal. Backward inclined centrifugal ventilators new york. In the air cleaner, the impeller is set in the rectangular casing. Backward curved centrifugal fans the centrifugal fan manufacturing companies have been investing in research a development to improve the efficiency of fans.
Characteristics and selection parameters of fans and. More than 70 hartzell offices can provide specific. Backward curved fans can be used with or without scroll housing, and find its application in sucking operations, and where static required at fan inlet is high. Every wheel model in the backwardcurved product line has its unique advantages and displays its entire potential during operation highest levels of efficiency, very high performance density and a pleasant noise spectrum characterize these products. Airhandling efficiencies of the hp backward curved fan are higher than common radial fans and, therefore, offer lower noise levels. Backward curved centrifugal fans exclusive uk fan supplier. Like the hyblades the fan blades of the radical centrifugal fans are designed with a dimensionally stable, hybrid construction.
Our complete range of blowers is available in ac and ec technology. Typical applications commercial and industrial supply or exhaust applications requiring. Type centrifugal backward curved blades diameters 40 to 60 inches 1016 to 1524mm belt drive arrangement 9cb available up to 250 hp. Curved blades are idea for highvolume, lowpressure applications. High efficiency industrial backward curved fans fa n. Backwardcurve centrifugal fans feature lubricated maintenancefree ball bearings and vibrationfree operation.
Pdf centrifugal fans with backwardcurved and forwardcurved. Backwardcurved centrifugal fans the centrifugal fan manufacturing companies have been investing in research a development to improve the efficiency of fans. If the opposite were true, increased an increased flow rate would cause increase fan power, which is unstable. We are considered to be one of the prime suppliers of backward curved fans in india. Now, after the successful market launch of the hyblade axial fans, the energyefficient radical fans from ebmpapst are defining new standards in the centrifugal field of ventilation and airconditioning technology.