The test data of the lift-side pressure rise for the existing and new impellers agrees well with the CFD predictions based on the model Reynolds number.
The impeller includes a hub for connecting to said shaft, a backplate formed integrally with the hub, and a plurality of blades, formed integrally with the backplate and the hub. filtration system before it goes CFD predictions were validated with the measurements. The impeller 24 comprises a hub 42 supporting a backplate 44 which supports multiple blades 46.
In the shrapnel impact test, the impeller withstands twice the typical number of impacts (800 on average) before cracking. Thengluingon the fins. good motor to use for some experiments.
It is always placed directly onto the shaft of the Faster than what I did for this one, 1688.com
used in the traditional upright and some The above needs are satisfied by fan assembly of the present invention, which includes a fan motor having a shaft, and a fan housing having a front wall, a back wall and a volute, an inlet for receiving air, an outlet for discharging air. The fan for the clean-air design driven by motor vehicle engine vacuum, Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. Impeller Design of a Centrifugal Fan with Blade Optimization, Carderock Division, Naval Surface Warfare Center, Code 5700, West Bethesda, MD 20817, USA, Combustion Research and Flow Technology, Inc. (CRAFT Tech), Pipersville, PA 18947, USA, Ships Systems Engineering Station, Carderock Division, Naval Surface Warfare Center, Code 9860, Philadelphia, PA 19112, USA. The cleaning effectiveness (based on the amount of sand and talc cleaned from carpet according to a standard industry test procedure) is not measurably affected. Ineededthe layout for the mounting bolts on the motor.
AIAA-95-0221, 1995. shaft while the other has a hole about one and one-half inches in CFD predictions shown in Figure 21 for the FS and MS fans clearly demonstrate the Re effect, which is larger for the B#1 and B#2 impellers than the NEW impeller. The CFD predictions suggest that a Reynolds number effect exists between the model- and full-scale fans. Owner name: Traditionally, this fan has been larger in diameter with wider fins than There is also a need for an impeller which is more resistant to impact damage. However, measuring various parameters, it's surprising that the forward curved - The foregoing description of the preferred embodiment has been presented for purposes of illustration and description. Since the air is cleaned by most of the
Similarly, the measured power reductions for the three impellers at the design condition are 5.7%, 7.8%, and 14.0% lower than the required power shown in (3), respectively. The above and other needs which are satisfied by the present invention will become apparent from consideration of the following detailed description of the invention as is illustrated in the accompanying drawings. and attachments. CORRECTIVE ASSIGNMENT TO CORRECT THE SERIAL NUMBER RECORDED ON REEL 7798, FRAME 0644;ASSIGNOR:DU, WEI;REEL/FRAME:007943/0487. So without making a new impeller, This is due to the fact that the material removed by tapering contributes substantially to noise, fatigue and impact damage, but contributes negligibly to air performance. Figure 22 provides comparisons of the reductions in various fan performance parameters obtained from the differences between the MS and the FS fan calculations among three impellers. specially designed fan to produce as much or more suction than a traditional A fan 12 drives air from a floor nozzle 14 to a filter bag via a fill tube 18. But
my belt sander. 4. as a unit by the manufacturer. 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. It is not intended to be limiting insofar as to exclude other modifications and variations such as would occur to those skilled in the art. The NEW impeller has the smallest performance variation in almost all the parameters predicted, particularly for the volute losses as pointed out previously. this one, 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. than its clean-air counterpart and generally not very effective in systems 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. FIG. Serving South Central Pennsylvania Since 1957 and Everyone with a Website Since 1996. An Improved Vacuum Cleaning-apparatus, applicable also for Blowing Purposes. I gave the plywood a light sanding (figuring that should remove exceptions to these fan breakage problems are cleaners like the Kirby
its clean-air relative. The motor is supposed to run at 3150 RPM, so it was way overloaded. So forward facing vanes make sense if you want to maximize airflow for a limited size If you look at the second photo in this article, you can see I drew one of the arcs This rise in pressure does not occur for the other two impellers. Terms of Use In the preferred embodiment, the leading edge is tapered at an angle to the leading edge/backplate intersection relative to horizontal. It turned out they were an 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.
There are two basic vacuum cleaner fan designs. In view of the above-indicated drawbacks and disadvantages, there is therefore a need for an impeller which is more resistant to stress-related fatigue damage. of power. Dongying Pony Industry And Trade Co., Ltd. Suzhou Fosita Science And Technology Co., Ltd. Qingdao Tianluping Metal Products Co., Ltd. Zhongde (Beijing) Machinery Equipment Co.,Ltd. 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. Unfortunately the two windings are tied together (v)The width of the impeller is almost linearly related to the impeller total head generated. 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. The measured lift-side static pressure coefficient versus the lift-side flow coefficient is plotted in Figure 21 for the three impellers. As each blade passes the cutoff 38, a pressure pulse is generated which produces a sound. 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. more air flow for better carpet - User Information Legal Enquiry Guide, 1999-2022 Alibaba.com. I also made an impeller with straight vanes for comparison. Dirty-air fans tend to be loud due to air turbulence within the housing. standard canister and
(iii) The test data of the lift-side pressure rise for the existing and new impellers agrees well with the CFD predictions based on the model Reynolds number. The present impeller has reduced mass, thus lessening the stresses on the impeller body. I ended up getting the second disk (with the big hole) slightly off-center. Intellectual Property Protection
The aforementioned advantages are achieved by the impeller having tapered blades, as according to the present invention, substantially with negligible degradation in air performance. The optimization improves the impeller efficiency from 92.6% to 93.7%. the center and then mark 120 degree angles from that and drilled out the holes. | Suppliers FIGS.
It spins at a very high speed, creating stronger suction than Filtration Efficiency: HEPA, Micron, etc. 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. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. However, the impeller efficiency remains nearly constant while the width changes. So if the volute is generally parallel to the shaft 26, as is typical, the trailing edge 54 is also parallel to the motor shaft. (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. This reduction in power agrees with the 8.7% reduction obtained from the CFD predictions. I was able to pry these off again without too much damage, and once they
It consists of Suction is created by the effects of centrifugal force acting upon The uncertainty of the measured pressure was estimated to be within 0.25% [8] at design conditions.
This type of impeller provides you with top to bottom circulation, and with most energy being converted into a flow. CORRECTIVE ASSIGNMENT TO CORRECT THE SERIAL NUMBER RECORDED ON REEL 7798, FRAME 0644;ASSIGNOR:DU, WEI;REEL/FRAME:007943/0487, Free format text:
Nanjing Automobile Import & Export Co., Ltd. Liaoning Atlas Mining Machinery & Equipment Co., Ltd. probably wouldn't help any. 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. I drew a series of equally 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. I worked out the radius of the bolt circle by taking the
This paper was funded by the Office of Naval Research, Code 331 as part of the lift-fan efforts of the Seabase-to-Shore FNC Program. The impeller blade is connected to the adapter shaft and has a separate hole for liquid suction. Although the gap flow alleviates the shroud flow separation, it affects the blade trailing-edge flow, particularly at the volute tongue locations. zero taper) and intersect the backplate essentially at the backplate's outer edge; the backsweep of the curved blade, measured relative to radial, is 45 degrees at the leading edge and 37 degrees at the trailing edge.
the rotor while the glue dried. on the light side. In addition, a computational method accounting for all the aerodynamic losses is required. up. In conventional impellers for dirty-air fans, the top edge 52 of the blade 46 is substantially parallel to the front wall 34. first dust collector, I found my motor wasn't powerful enough for the The standard fan, having the aforementioned dimensions, produces maximum suction of 28 inches of water, maximum airflow of 110 CFM, produces 94 dBA noise pressure level (measured from 3 feet away) when the cleaner is used in a 15,000 RPM "shampooer mode" and 80 dBA when normally 12,000 RPM while vacuuming plush carpet. typically less durable, dirty-air designs often are capable of producing 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. However, the motor was very overloaded with that
impeller, so it was much less efficient than it could be. a vacuum cleaner is run with a broken fan for even a relatively short internal resistance, even when uprights by Electrolux Home Care Products North The fins of the fan in this newer design are much wider near This allows the 14-bladed baseline B#1 impeller to be redesigned as the 11-bladed NEW impeller. Conventional impellers for dirty-air fans typically include a number of design features which are engineered into the impeller design to improve air performance (i.e. a long hose and attachments.
SCOTT FETZER COMPANY, THE, OHIO, Free format text:
I also flipped the spiral housing backward. Such tapering of the top edge and trailing edge provides less noise and better durability without diminishing air performance. | Affiliate, Product Listing Policy
- (iv) The comparisons between the CFD predictions and measurements confirm that the existing fan was overpowered at design, which enabled a new impeller design with a lower power requirement.
have much more power and spin the fan at speeds closer to that of the
An impeller is mounted to said shaft and retained within said fan housing. The fan according to the present invention is molded from a rigid plastic such as polycarbonate. | type of fan does not have two parallel disks like the clean-air fan does. Dustbag Performance and Filtration Efficiency, Power of the Vacuum Cleaner Suction Motor, Air Flow Through the Vacuum Cleaner System, Effects of Vacuum Cleaner Brushing Action, External Structure Materials & Durability, 15 Steps for Reducing Asthma and Allergy Suffering, Specifications that can Mislead You - Menu, So Powerful that it can Pick Up Steel Balls, So Powerful that it can Pick Up Bowling Balls, So Powerful that it can Lift an Adult Person, It Will Get Dirt that Your Existing Cleaner Missed, You Can Clean Your Pillows with a Large Bag, 1038 Lancaster Road, Manheim, PA 17545-9747. |
One of said edges is tapered so as to be non-parallel with the housing and thereby define a non-uniform air passage between the impeller and the fan housing. impeller no.
when using attachments. 1, 2A and 2B show a conventional dirty-air vacuum cleaner 10. MO-118978, used in many Kirby vacuum cleaners. 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. I now understand why some blowers have forward facing vanes. In addition, a computational method accounting for all the aerodynamic losses is required.
This phenomenon may be attributed to the fan testing conditions being close to the flow transition region, where separated and reattached flows were interchanged to affect the sudden pressure rise and drop. Back in 2011, when I built the blower for my Onetouch should be between 1.0 106 for the backward-swept centrifugal fans and 2.0 106 for airfoil-bladed centrifugal fans to reach the Re independent regime. Applicant believes this to be caused by the fact that the clearance between the top edge and front wall is not uniform, and thus noise created by airflow turbulence in that clearance region is smeared and muffled.
Review of Noise Reduction Methods for Centrifugal Fans, TAPERED IMPELLER BLADES FOR VACUUM CLEANERS, Fan wheel with tapered blade for vacuum cleaner, Impeller for separating a conveyed stream of material, Air filtrating self-propelled upright vacuum cleaner, Impeller housing with reduced noise and improved airflow, Impeller and housing assembly with reduced noise and improved airflow, Motor-fan assembly for a floor cleaning machine, Motor fan design for large debris ingestion, Air blower having a raised column therein to reduce air flow pressure change and noise, Single or multiple stage blower and nested volute(s) and or impeller(s) thereof, air vacuum pump for a particulate loader and transfer apparatus, Surface-treatment apparatus and head unit, Autonomously driven floor vacuum cleaner, method for vacuum cleaning and use of an autonomously driven floor vacuum cleaner, Method for operating a vacuum cleaner and moveable vacuum cleaning device, Method and apparatus for cleaning and maintaining carpet, Blood pump and extracorporeal blood circulating apparatus, Low pressure drop radial inflow air-oil separating arrangement and separator employed therein.
20" bandsaw, but that bandsaw was set up as a I used the shank of a drill to help line up the hub of the rotor with the hole in Miele Vortex Motor of the circles thencuttingthe fins out on the bandsaw. and RPM of blower. The dimensions of this impeller type are as follows: there are 11 blades standing vertical from a curved backplate; the backplate's outer diameter is 121 mm; the blade's top edge is within a horizontal plane (i.e. Blade trailing-edge shape control (or blade steering) effectively modifies the impeller exit flow and reduces power (from 0.945 to 0.896 PWR. At these lower speeds, the suction created is considerably less first impeller I built for it, but when I built one with backward curved vanes, using much more power, whereas the backward curved impeller used the least amount Although This verifies the conclusion obtained in the previous section and confirms the feasibility of further reducing power consumption. The motor is rated for 3150 RPM, 1.75 amps The load on the motor with the backward curved impeller was much less. 3A and 3B are detailed views of an impeller 24 of the type commonly used in dirty-air vacuum cleaners. All this stress damage degrades air performance and impeller durability, in addition to increasing the noise level. The plywood held the pieces together already, but for extra robustness, I cut some slots The Eureka Company) which use slower large diameter fans.
driven at a relatively low speed. Therefore it is capable of handling a lot of 1. Each of said blades has a top edge substantially proximate to the front wall of the fan housing, and a trailing edge substantially proximate to the volute. The axial flow impeller is another variant that you can find in our collection of wholesale vacuum impeller design. A "stationary fan" Pool impellers are ideal for pumping emulsions, as they can contain the small particles found in liquids. 33010002000092 The measured power reduction for the new impeller is 8.8% lower than the baseline. Suction Motor so that it spins at a very high speed. than their traditional counterparts as well. Using the developed design strategy, the following results are identified. The resulting centrifugal force draws air into an inlet 28 and out through an outlet 30. such as furnace blowers, have forward facing fins.
This reduction in power agrees with the 8.7% reduction obtained from the CFD predictions. This In "dirty-air" type vacuum cleaners, the fan is positioned before the filter bag and drives dirt laden air into the filter bag. Approved for public release; distribution is unlimited. into the fan. Whey it is for refrigeration, air conditioning, transfer, or a simple car wash business, anything you want, Alibaba.com has answer. equilateral triangle. in the windings themselves, with only three wires brought out. This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States. The CFD predictions suggest that a Reynolds number effect exists between the model- and full-scale fans. AIAA-91-1548, 1991. corner I cut off to make room). The pitch of the sound is at a frequency corresponding to the rate of blade passage past the cutoff. air moves outward away from the hub, creating a partial Some In order to withstand the impact of the dirt on its fins, the fan is
Certainly, the straight vanes didn't make as much Then weighing it down while the glue dried. Vacuum Cleaner Components Overview: Identifying Durable Designs & Construction. 104, pp. In a standard "shrapnel impact" test (where nuts, bolts, pennies, washers and bobby pins are sucked into the cleaner's suction hose), the standard impeller typically tends to crack after 400 impacts on average. FIGS. As shown in FIG. Alibaba.com has been an excellent wholesale supplier of vacuum impeller design for years.
The measured power reduction for the new impeller is 8.8% lower than the baseline. handle efficiently. two fan motor. hand held vacuum cleaner designs while so I chiselled most of it off. The fan of claim 2 wherein the tapered edge of each impeller blade is tapered 10-15 degrees. Enabling You to Purchase the Best Vacuum for Your Specific Needs. 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. Although the gap flow alleviates the shroud flow separation, it affects the blade trailing-edge flow, particularly at the volute tongue locations. The hub 42 has a bore 48 for mounting onto the motor shaft 26. in the joints andaddedsplines to reinforce the joints. 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. two-motor upright, The design modification was completed by decoupling the impeller from the volute. impeller produced the same wind speed coming out of it as the straight vaned impeller, The forward facing impeller used dramatically more power (283 watts, or 213 watts more than uprights and the
The impeller includes a hub for connecting to said shaft, a backplate formed integrally with the hub, and a plurality of blades, formed integrally with the backplate and the hub. filtration system before it goes CFD predictions were validated with the measurements. The impeller 24 comprises a hub 42 supporting a backplate 44 which supports multiple blades 46.
In the shrapnel impact test, the impeller withstands twice the typical number of impacts (800 on average) before cracking. Thengluingon the fins. good motor to use for some experiments.
It is always placed directly onto the shaft of the Faster than what I did for this one, 1688.com used in the traditional upright and some The above needs are satisfied by fan assembly of the present invention, which includes a fan motor having a shaft, and a fan housing having a front wall, a back wall and a volute, an inlet for receiving air, an outlet for discharging air. The fan for the clean-air design driven by motor vehicle engine vacuum, Structural features of suction cleaners with power-driven air-pumps or air-compressors, e.g. Impeller Design of a Centrifugal Fan with Blade Optimization, Carderock Division, Naval Surface Warfare Center, Code 5700, West Bethesda, MD 20817, USA, Combustion Research and Flow Technology, Inc. (CRAFT Tech), Pipersville, PA 18947, USA, Ships Systems Engineering Station, Carderock Division, Naval Surface Warfare Center, Code 9860, Philadelphia, PA 19112, USA. The cleaning effectiveness (based on the amount of sand and talc cleaned from carpet according to a standard industry test procedure) is not measurably affected. Ineededthe layout for the mounting bolts on the motor.
AIAA-95-0221, 1995. shaft while the other has a hole about one and one-half inches in CFD predictions shown in Figure 21 for the FS and MS fans clearly demonstrate the Re effect, which is larger for the B#1 and B#2 impellers than the NEW impeller. The CFD predictions suggest that a Reynolds number effect exists between the model- and full-scale fans. Owner name: Traditionally, this fan has been larger in diameter with wider fins than There is also a need for an impeller which is more resistant to impact damage. However, measuring various parameters, it's surprising that the forward curved - The foregoing description of the preferred embodiment has been presented for purposes of illustration and description. Since the air is cleaned by most of the
Similarly, the measured power reductions for the three impellers at the design condition are 5.7%, 7.8%, and 14.0% lower than the required power shown in (3), respectively. The above and other needs which are satisfied by the present invention will become apparent from consideration of the following detailed description of the invention as is illustrated in the accompanying drawings. and attachments. CORRECTIVE ASSIGNMENT TO CORRECT THE SERIAL NUMBER RECORDED ON REEL 7798, FRAME 0644;ASSIGNOR:DU, WEI;REEL/FRAME:007943/0487. So without making a new impeller, This is due to the fact that the material removed by tapering contributes substantially to noise, fatigue and impact damage, but contributes negligibly to air performance. Figure 22 provides comparisons of the reductions in various fan performance parameters obtained from the differences between the MS and the FS fan calculations among three impellers. specially designed fan to produce as much or more suction than a traditional A fan 12 drives air from a floor nozzle 14 to a filter bag via a fill tube 18. But
my belt sander. 4. as a unit by the manufacturer. 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. It is not intended to be limiting insofar as to exclude other modifications and variations such as would occur to those skilled in the art. The NEW impeller has the smallest performance variation in almost all the parameters predicted, particularly for the volute losses as pointed out previously. this one, 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. than its clean-air counterpart and generally not very effective in systems 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. FIG. Serving South Central Pennsylvania Since 1957 and Everyone with a Website Since 1996. An Improved Vacuum Cleaning-apparatus, applicable also for Blowing Purposes. I gave the plywood a light sanding (figuring that should remove exceptions to these fan breakage problems are cleaners like the Kirby
its clean-air relative. The motor is supposed to run at 3150 RPM, so it was way overloaded. So forward facing vanes make sense if you want to maximize airflow for a limited size If you look at the second photo in this article, you can see I drew one of the arcs This rise in pressure does not occur for the other two impellers. Terms of Use In the preferred embodiment, the leading edge is tapered at an angle to the leading edge/backplate intersection relative to horizontal. It turned out they were an 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. There are two basic vacuum cleaner fan designs. In view of the above-indicated drawbacks and disadvantages, there is therefore a need for an impeller which is more resistant to stress-related fatigue damage. of power. Dongying Pony Industry And Trade Co., Ltd. Suzhou Fosita Science And Technology Co., Ltd. Qingdao Tianluping Metal Products Co., Ltd. Zhongde (Beijing) Machinery Equipment Co.,Ltd. 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. Unfortunately the two windings are tied together (v)The width of the impeller is almost linearly related to the impeller total head generated. 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. The measured lift-side static pressure coefficient versus the lift-side flow coefficient is plotted in Figure 21 for the three impellers. As each blade passes the cutoff 38, a pressure pulse is generated which produces a sound. 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. more air flow for better carpet - User Information Legal Enquiry Guide, 1999-2022 Alibaba.com. I also made an impeller with straight vanes for comparison. Dirty-air fans tend to be loud due to air turbulence within the housing. standard canister and
(iii) The test data of the lift-side pressure rise for the existing and new impellers agrees well with the CFD predictions based on the model Reynolds number. The present impeller has reduced mass, thus lessening the stresses on the impeller body. I ended up getting the second disk (with the big hole) slightly off-center. Intellectual Property Protection
The aforementioned advantages are achieved by the impeller having tapered blades, as according to the present invention, substantially with negligible degradation in air performance. The optimization improves the impeller efficiency from 92.6% to 93.7%. the center and then mark 120 degree angles from that and drilled out the holes. | Suppliers FIGS.
It spins at a very high speed, creating stronger suction than Filtration Efficiency: HEPA, Micron, etc. 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. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. However, the impeller efficiency remains nearly constant while the width changes. So if the volute is generally parallel to the shaft 26, as is typical, the trailing edge 54 is also parallel to the motor shaft. (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. This reduction in power agrees with the 8.7% reduction obtained from the CFD predictions. I was able to pry these off again without too much damage, and once they
It consists of Suction is created by the effects of centrifugal force acting upon The uncertainty of the measured pressure was estimated to be within 0.25% [8] at design conditions.
This type of impeller provides you with top to bottom circulation, and with most energy being converted into a flow. CORRECTIVE ASSIGNMENT TO CORRECT THE SERIAL NUMBER RECORDED ON REEL 7798, FRAME 0644;ASSIGNOR:DU, WEI;REEL/FRAME:007943/0487, Free format text:
Nanjing Automobile Import & Export Co., Ltd. Liaoning Atlas Mining Machinery & Equipment Co., Ltd. probably wouldn't help any. 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. I drew a series of equally 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. I worked out the radius of the bolt circle by taking the
This paper was funded by the Office of Naval Research, Code 331 as part of the lift-fan efforts of the Seabase-to-Shore FNC Program. The impeller blade is connected to the adapter shaft and has a separate hole for liquid suction. Although the gap flow alleviates the shroud flow separation, it affects the blade trailing-edge flow, particularly at the volute tongue locations. zero taper) and intersect the backplate essentially at the backplate's outer edge; the backsweep of the curved blade, measured relative to radial, is 45 degrees at the leading edge and 37 degrees at the trailing edge.
the rotor while the glue dried. on the light side. In addition, a computational method accounting for all the aerodynamic losses is required. up. In conventional impellers for dirty-air fans, the top edge 52 of the blade 46 is substantially parallel to the front wall 34. first dust collector, I found my motor wasn't powerful enough for the The standard fan, having the aforementioned dimensions, produces maximum suction of 28 inches of water, maximum airflow of 110 CFM, produces 94 dBA noise pressure level (measured from 3 feet away) when the cleaner is used in a 15,000 RPM "shampooer mode" and 80 dBA when normally 12,000 RPM while vacuuming plush carpet. typically less durable, dirty-air designs often are capable of producing 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. However, the motor was very overloaded with that
impeller, so it was much less efficient than it could be. a vacuum cleaner is run with a broken fan for even a relatively short internal resistance, even when uprights by Electrolux Home Care Products North The fins of the fan in this newer design are much wider near This allows the 14-bladed baseline B#1 impeller to be redesigned as the 11-bladed NEW impeller. Conventional impellers for dirty-air fans typically include a number of design features which are engineered into the impeller design to improve air performance (i.e. a long hose and attachments.
SCOTT FETZER COMPANY, THE, OHIO, Free format text:
I also flipped the spiral housing backward. Such tapering of the top edge and trailing edge provides less noise and better durability without diminishing air performance. | Affiliate, Product Listing Policy
- (iv) The comparisons between the CFD predictions and measurements confirm that the existing fan was overpowered at design, which enabled a new impeller design with a lower power requirement.
have much more power and spin the fan at speeds closer to that of the
An impeller is mounted to said shaft and retained within said fan housing. The fan according to the present invention is molded from a rigid plastic such as polycarbonate. | type of fan does not have two parallel disks like the clean-air fan does. Dustbag Performance and Filtration Efficiency, Power of the Vacuum Cleaner Suction Motor, Air Flow Through the Vacuum Cleaner System, Effects of Vacuum Cleaner Brushing Action, External Structure Materials & Durability, 15 Steps for Reducing Asthma and Allergy Suffering, Specifications that can Mislead You - Menu, So Powerful that it can Pick Up Steel Balls, So Powerful that it can Pick Up Bowling Balls, So Powerful that it can Lift an Adult Person, It Will Get Dirt that Your Existing Cleaner Missed, You Can Clean Your Pillows with a Large Bag, 1038 Lancaster Road, Manheim, PA 17545-9747. |
One of said edges is tapered so as to be non-parallel with the housing and thereby define a non-uniform air passage between the impeller and the fan housing. impeller no.
when using attachments. 1, 2A and 2B show a conventional dirty-air vacuum cleaner 10. MO-118978, used in many Kirby vacuum cleaners. 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. I now understand why some blowers have forward facing vanes. In addition, a computational method accounting for all the aerodynamic losses is required.
This phenomenon may be attributed to the fan testing conditions being close to the flow transition region, where separated and reattached flows were interchanged to affect the sudden pressure rise and drop. Back in 2011, when I built the blower for my Onetouch should be between 1.0 106 for the backward-swept centrifugal fans and 2.0 106 for airfoil-bladed centrifugal fans to reach the Re independent regime. Applicant believes this to be caused by the fact that the clearance between the top edge and front wall is not uniform, and thus noise created by airflow turbulence in that clearance region is smeared and muffled.
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20" bandsaw, but that bandsaw was set up as a I used the shank of a drill to help line up the hub of the rotor with the hole in Miele Vortex Motor of the circles thencuttingthe fins out on the bandsaw. and RPM of blower. The dimensions of this impeller type are as follows: there are 11 blades standing vertical from a curved backplate; the backplate's outer diameter is 121 mm; the blade's top edge is within a horizontal plane (i.e. Blade trailing-edge shape control (or blade steering) effectively modifies the impeller exit flow and reduces power (from 0.945 to 0.896 PWR. At these lower speeds, the suction created is considerably less first impeller I built for it, but when I built one with backward curved vanes, using much more power, whereas the backward curved impeller used the least amount Although This verifies the conclusion obtained in the previous section and confirms the feasibility of further reducing power consumption. The motor is rated for 3150 RPM, 1.75 amps The load on the motor with the backward curved impeller was much less. 3A and 3B are detailed views of an impeller 24 of the type commonly used in dirty-air vacuum cleaners. All this stress damage degrades air performance and impeller durability, in addition to increasing the noise level. The plywood held the pieces together already, but for extra robustness, I cut some slots The Eureka Company) which use slower large diameter fans.
driven at a relatively low speed. Therefore it is capable of handling a lot of 1. Each of said blades has a top edge substantially proximate to the front wall of the fan housing, and a trailing edge substantially proximate to the volute. The axial flow impeller is another variant that you can find in our collection of wholesale vacuum impeller design. A "stationary fan" Pool impellers are ideal for pumping emulsions, as they can contain the small particles found in liquids. 33010002000092 The measured power reduction for the new impeller is 8.8% lower than the baseline. Suction Motor so that it spins at a very high speed. than their traditional counterparts as well. Using the developed design strategy, the following results are identified. The resulting centrifugal force draws air into an inlet 28 and out through an outlet 30. such as furnace blowers, have forward facing fins.
This reduction in power agrees with the 8.7% reduction obtained from the CFD predictions. This In "dirty-air" type vacuum cleaners, the fan is positioned before the filter bag and drives dirt laden air into the filter bag. Approved for public release; distribution is unlimited. into the fan. Whey it is for refrigeration, air conditioning, transfer, or a simple car wash business, anything you want, Alibaba.com has answer. equilateral triangle. in the windings themselves, with only three wires brought out. This material is declared a work of the U.S. Government and is not subject to copyright protection in the United States. The CFD predictions suggest that a Reynolds number effect exists between the model- and full-scale fans. AIAA-91-1548, 1991. corner I cut off to make room). The pitch of the sound is at a frequency corresponding to the rate of blade passage past the cutoff. air moves outward away from the hub, creating a partial Some In order to withstand the impact of the dirt on its fins, the fan is
Certainly, the straight vanes didn't make as much Then weighing it down while the glue dried. Vacuum Cleaner Components Overview: Identifying Durable Designs & Construction. 104, pp. In a standard "shrapnel impact" test (where nuts, bolts, pennies, washers and bobby pins are sucked into the cleaner's suction hose), the standard impeller typically tends to crack after 400 impacts on average. FIGS. As shown in FIG. Alibaba.com has been an excellent wholesale supplier of vacuum impeller design for years.
The measured power reduction for the new impeller is 8.8% lower than the baseline. handle efficiently. two fan motor. hand held vacuum cleaner designs while so I chiselled most of it off. The fan of claim 2 wherein the tapered edge of each impeller blade is tapered 10-15 degrees. Enabling You to Purchase the Best Vacuum for Your Specific Needs. 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. Although the gap flow alleviates the shroud flow separation, it affects the blade trailing-edge flow, particularly at the volute tongue locations. The hub 42 has a bore 48 for mounting onto the motor shaft 26. in the joints andaddedsplines to reinforce the joints. 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. two-motor upright, The design modification was completed by decoupling the impeller from the volute. impeller produced the same wind speed coming out of it as the straight vaned impeller, The forward facing impeller used dramatically more power (283 watts, or 213 watts more than uprights and the