3, an outer liner including an upper surface liner 42 and a lower surface liner 44 is placed in relation to be overlapped with the upper and lower surface walls 28 and 30, and is fixed thereat by screwed upset type coupling members, etc. The leading edges or nose portion of the upper and lower surface walls 28 and 30 are welded to a solid rod 32, while the trailing edges thereof are also welded to a rib 34 with a relatively narrow width, provided at the rear end portion. 3, that a blade 14 of a generally hollow structure fundamentally includes an inner frame having a plurality of ribs 20 and 26 provided to be arranged from a leading edge to a trailing edge of the blade 14, and an upper surface wall 28 and a lower surface wall 30 applied onto the inner frame to provide a surface wall assembly, thereby forming a desired airfoil section as illustrated. It has been a recent trend that airfoil blades have been employed not only for large-sized blowers, but also for blowers in domestic use as well, for the purpose of improving performance of such blowers.Ĭonventionally, for manufacturing such airfoil blades, it has been so arranged, for example, as shown in FIG. The increasing arc’s broad blade tip improves impeller performance in inefficient inlet geometry and is especially effective with a sharp-edge inlet or large tip clearance.The present invention generally relates to a fan impeller for use in an air conditioner or the like, and more particularly, to airfoil blades for a fan impeller, and also manufacturing method thereof. Finally, our increasing arc impellers are ideal for generating high static pressures and high airflows in a lightweight fan. And reduced fan speeds also mean reduced tip-speed-generated sound, which is one more reason why the broad paddle is the selection of choice in oil coolers, condensers, and for cooling tower fans. Multi-Wing’s broad paddle impellers use a broad chord width to generate high pressures at lower RPM. The sickle varies from the airfoil because the blade uses a distinct curved leading edge and also has a broader surface area, though both are high efficiency impellers. Like the airfoil, the sickle impeller is specifically designed for sound reduction by reducing vortex shedding as air leaves the blade surface. As a low noise airfoil blade, its sturdy design is perfect for the most rugged applications involving heavy debris including waste management, agriculture and forestry. Our true reversible impeller is also airfoil selection, but its unique design allows it to produce equal airflow in both directions with efficiencies well above 70 percent. The high efficiency airfoil is ideal in a compact envelope and can be the most efficient impeller in optimized conditions. Multi-Wing’s airfoil impellers have a twisted blade design that reduces vortex shedding along the blade profile, making it a very popular choice for low noise applications. Our design flexibility is a direct result of our component part system and five distinct blade profiles, married with our sales engineering staff’s generations of application expertise. Multi-Wing designs custom impellers for applications requiring low noise impellers, high efficiency impellers, high airflow impellers and high pressure impellers. Multi-Wing America builds a broad range of high strength impellers across the HVAC, refrigeration, and industrial heat exchanger markets. Custom axial impellers designed from five different impeller profiles
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