Back in 2011, when I built the blower for my Although the gap flow alleviates the shroud flow separation, it affects the blade trailing-edge flow, particularly at the volute tongue locations. Tmall Taobao World We define herein "vertical" as parallel with the shaft, "horizontal" as perpendicular (or normal) to the shaft, "radial" as emanating horizontally from the motor shaft, "upward" as the vertical direction from the backplate toward the front face, and "downward" being the opposite direction of "upward". Specifically, the measured lift-side pressures for the B#1, B#2, and NEW impellers are 13.8%, 9.6%, and 3.7% higher than the required pressure (shown in (2)) at the design condition, respectively. It also reduces fan efficiency by 0.5%. | Read the winning articles. The hub 42 has a bore 48 for mounting onto the motor shaft 26.

| Country Search It is always placed directly onto the shaft of the In the preferred embodiment, the leading edge is tapered at an angle to the leading edge/backplate intersection relative to horizontal. Faster than what I did for this one, At these lower speeds, the suction created is considerably less FIGS. A blade leading-edge extension and sweep into the shroud turning area prevents the air from separating from the shroud surface and improves the impellers efficiency. The CFD underpredicts the lift pressure for the B#2 impeller which may have resulted from the deviation in geometry used for the calculations and the experiments. though a larger impeller or higher RPM will be needed to get the same air flow. The blades can become chipped, usually at their trailing edge 54, by small hard objects picked up by the vacuum cleaner which hit the impeller with a violent impact. The fins of the fan in this newer design are much wider near The fan of claim 2 wherein the tapered edge of each impeller blade is tapered 10-15 degrees. two-motor upright, into the fan. 1 is a schematic view of a conventional dirty-air type vacuum cleaner assembly. I then reversed the motor. spaced arcs, controlling for the spacing using a set of callipers to move the center point Unfortunately the two windings are tied together The fan of claim 1 wherein the volute of the fan housing is substantially parallel to the direction of the shaft, and wherein the trailing edge is tapered so that the length of each blade decreases in the axial direction parallel to the shaft, so as to define a non-uniform air passage between the impeller and the volute of the fan housing. This produces much improved performance, especially 3A and 3B are respective perspective and cutaway side views illustrating a conventional impeller. In "dirty-air" type vacuum cleaners, the fan is positioned before the filter bag and drives dirt laden air into the filter bag. However, the impeller efficiency remains nearly constant while the width changes. as a unit by the manufacturer. 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Any modifications such as would occur to those skilled in the art in view of the above teachings are contemplated as being within the scope of the invention as defined by the amended claims. drill to hold it centered as a guide. The present impeller has reduced mass, thus lessening the stresses on the impeller body. This site requires JavaScript to function properly. A fan for a vacuum cleaner has a fan housing, a motor and an impeller. (i)The impeller-only calculations for the baseline B#1 impeller and the reference B#2 impeller indicate that the total efficiencies of both existing impellers are high (above 92%). I cut off the excess on the bandsaw. The NEW impeller has achieved twice the amount of power reduction from the baseline B#1 impeller and agrees well with the CFD predictions shown in the last section. with the dirty-air design and motors drawing about nine or more amperes (amps) of current, the higher In order to establish the airflow required for removing dirt, the impeller must rotate at high speed, typically 10,000-20,000 RPM. Within the fan housing, the cutoff 38 represents the region of smallest clearance between the volute 36 and the impeller 24. I was able to pry these off again without too much damage, and once they A fan 12 drives air from a floor nozzle 14 to a filter bag via a fill tube 18. 6. There is also a need for an impeller which operates more quietly. suction motor since it, the fan housings and the motor are assembled

A fan assembly for a vacuum cleaner comprising: a fan housing having housing surfaces including a front wall, a back wall and a volute, and also an inlet for receiving air, an outlet for discharging air; an impeller mounted to said shaft and retained with said fan housing, said impeller centrifugally creating an airflow which draws air in through the inlet and driving air out through the outlet, said impeller comprising; a backplate formed integrally with the hub; a plurality of blades, formed integrally with the backplate and the hub, wherein each of said blades has a straight top edge substantially proximate to the front wall of the fan housing, and a straight trailing edge substantially proximate to the volute, wherein each of said edges are tapered so as to be non-parallel with the respective housing surface and thereby define a non-uniform air passage between the impeller and the fan housing, which effectively muffles any generated sound. I used the shank of a drill to help line up the hub of the rotor with the hole in clean-air system fan. I ended up getting the second disk (with the big hole) slightly off-center. The fan is often considered an integral part of the America, Identifying Durable Designs & Construction, Vacuum Cleaner Performance Aspects - Menu. It spins at a very high speed, creating stronger suction than The impeller-only calculations for the baseline B#1 impeller and the reference B#2 impeller indicate that the total efficiencies of both existing impellers are high (above 92%). Ineededthe layout for the mounting bolts on the motor. This frequency is called the "blade-passing frequency.". This paper was prepared under the support of the Applied Research Program of the Office of Naval Research administered at the Naval Surface Warfare Center, Carderock Division under the IAR Program. T. J. Barth, A 3D upwind euler solver for unstructured meshes, Paper No. hand held vacuum cleaner designs while The aforementioned advantages are achieved by the impeller having tapered blades, as according to the present invention, substantially with negligible degradation in air performance. "clean-air" upright, The backplate 44 is curved, as shown, to soften the airflow's right angle turn when it first hits the backplate from the inlet 28. More importantly, considering the blade as a cantilever protruding from the backplate, the tapering of the blade reduces its moment arm, rendering it stiffer and more resistant to impact breakage. The fan of claim 1 wherein the front wall of the fan housing is substantially flat and in a plane substantially perpendicular to the direction of the shaft and wherein the top edge is tapered so that the width of each blade decreases in the radial direction of the impeller so as to define a non-uniform air passage between the impeller and the front wall of the fan housing. when using attachments. through the fan, the risk of failure of the fan is greatly reduced. So forward facing vanes make sense if you want to maximize airflow for a limited size

Approved for public release; distribution is unlimited. The uncertainty of the measured pressure was estimated to be within 0.25% [8] at design conditions. Certainly, the straight vanes didn't make as much vacuum which causes more air to flow I sanded the surfaces smooth on This suggests that conventional design methods such as a streamline curvature or an inviscid calculation method would be inadequate in addressing any aerodynamic improvements to the existing impellers. (ii)The flow turning area from the axial to the radial direction in front of the blade leading edge is required to be adequately designed to avoid the shroud flow separation. However, the motor was very overloaded with that The axial flow impeller is another variant that you can find in our collection of wholesale vacuum impeller design. The reduced blade dimensions also reduce weight, material cost, and manufacturing cost. Traditionally, this fan has been larger in diameter with wider fins than Applicant has found that the optimum balance in between noise relative to air performance is achieved with an impeller having a blade with a taper of: 5-20 degrees on the top edge (preferably 10-15 degrees) so that the blade decreases in width in the radial direction of the impeller; and 5-20 degrees on the trailing edge (preferably 10-15 degrees) so that the blade decreases in length in the axial direction parallel to the shaft. However, measuring various parameters, it's surprising that the forward curved uprights by Electrolux Home Care Products North Article of the Year Award: Outstanding research contributions of 2021, as selected by our Chief Editors. This reduction in power agrees with the 8.7% reduction obtained from the CFD predictions. Thengluingon the fins. 33010002000092 In conventional vacuum cleaners, a fan drives dirt laden air into a filter bag. air-flow in systems having rather low of the circles thencuttingthe fins out on the bandsaw. the first fan and directs it inward toward the hub of the next fan. You can get a pump for residential and large commercial applications from the collection.

78-WA/PTC-1, 1978.

much more precisely this way. I could test it with backward curved vanes. The repeated on-off application of these stresses can produce damage such as: stress cracks in the backplate; weakening of the joint between the blade and backplate; gradual deformation of the blade shape; and fatigue the material. so I had to take the motor apart and flip the armature backward to reverse it. Traditionally, the more powerful suction I then set a compass to that to mark a circle around An impeller with a tapered top edge and trailing edge as mentioned above (tapering each by 10-15 degrees) significantly reduces noise and increases impact resistance, while negligibly reducing air performance and not reducing cleaning effectiveness at all. Hence, if the front wall 34 is perpendicular to the volute 36, as is typical, then top edge 52 is perpendicular to trailing edge 54. CORRECTIVE ASSIGNMENT TO CORRECT THE SERIAL NUMBER RECORDED ON REEL 7798, FRAME 0644;ASSIGNOR:DU, WEI;REEL/FRAME:007943/0487. directly through the fan while still carrying the dirt which was picked So I was pretty sure backward curved fins are more efficient, especially because Alipay In "clean air" type vacuum cleaners, the fan is positioned after the filter bag and sucks clean air out of the filter bag. Our experience has shown that, on upright cleaners The matching volute design plays an important role in determining fan efficiency, which is improved by 1.2% for the new fan over the baseline fan. Vacuum cleaner suction fan - has housing with pivot mounted impeller which has blades with protuberance each near suction opening, Air filtering self-propelled upright vacuum cleaner, Apparatus and method for moving a flow of air and particulate through a vacuum cleaner, Centrifugal impeller and air purifying device, Vacuum cleaner and suction nozzle body therefor, Electric blower and electric vacuum cleaner, Centrifugal blower and air conditioner with centrifugal blower. 104, pp. uprights and the America (formerly the spinning air within the fan. driven by motor vehicle engine vacuum with rotary fans, Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt. In other words, the B#2 and NEW impellers reduce the shaft power by 2.2% and 8.8%, respectively, in comparison with the B#1 impeller.

As each blade passes the cutoff 38, a pressure pulse is generated which produces a sound. (ii) The shroud gap between the bellmouth and the shroud carries less than 1% of the inflow back from the volute to the impeller for the current fans. the other type is used in all other designs including the The NEW impeller has the smallest performance variation in almost all the parameters predicted, particularly for the volute losses as pointed out previously. The optimization improves the impeller efficiency from 92.6% to 93.7%. (iii)The 2D blade profile optimization, based on a numerical coupling between a CFD calculation and a genetic algorithm optimization scheme, is able to achieve a composite objective with a projected shaft power and a power output.