US2138814A - Blower fan impeller - Google Patents

Blower fan impeller Download PDF

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Publication number
US2138814A
US2138814A US130968A US13096837A US2138814A US 2138814 A US2138814 A US 2138814A US 130968 A US130968 A US 130968A US 13096837 A US13096837 A US 13096837A US 2138814 A US2138814 A US 2138814A
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Prior art keywords
impeller
blades
air
blower fan
blade
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Expired - Lifetime
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US130968A
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Robert E Bressler
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Kol Master Corp
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/28Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
    • F04D29/282Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers the leading edge of each vane being substantially parallel to the rotation axis

Description

Dec. 6, 1938- R. E. BRESSLER BLOWER FAN IMPELLER Filed` March. l5, 1937 lllli@l Patented Dec. 6, 1938 UNITED STATES PATENT OFFICE BLOWER. FAN IMPELLER Robert E. Bressler, Oregon, Ill., assigner to Kol- Master Corporation, Oregon, Ill., a corporation of Illinois This invention relates to improvements in blower fan mpellers and it consists of the matters hereinafter described and more particularly pointed out in the appended claims.

In impellers of this kind, air is moved by being accelerated within the passages between the blades and is moved in the direction of the periphery of the impeller in the rapid rotation of the latter. In the conventional impellers of this kind, wherein the blade surfaces defining the passages are parallel or diverge toward the periphery of the impeller, certain resistances are oered to the issue or discharge of air at the outlet end of the passages. These resistances are certain eddy currents, partial vacuums and the like, which cause a jamming and shock in the air issuing from the passage so that such impellers are not as eicient or as quiet in operation as it is desired to have them.

One of the objects of the present invention is to provide an impeller of the kind which is more quiet and eilicient in operation than the conventional type of impeller for the same purpose.

A further object of the invention is to provide an impeller of this kind which is practical to make as a cast integral structure, thus materially reducing the cost thereof.

Another'object of the invention is to provide an impeller of this kind wherein the air passages between the blades taper toward their discharge ends to compensate for the progressively smaller space required because of increase in velocity, so as to minimize shocks, voids and impact losses.

The above mentioned objects of the invention,

as well as others, together with the several advantages thereof, will more fully appear as I proceed with my specification.

In the drawingzl Fig. l is a view in front" elevation of a blower fan impeller embodying the preferred form of the invention, parts of the shroud or front ring being omitted better to show the structure of the blades.

' v` Fig. 2 is a sectional view through a part of the impeller shown in Fig. 1 as taken on the line 2 2 thereof.

Fig. 3 is a fragmentary detail view on an en- The conventional impeller has either a radial orv paddle wheel type of blade, a forward curvature blade, a rearward curvature blade or a radial tip or reverse curve blade, all of which are well known and while the invention is herein shown and described asA embodied in an impeller wherein the 5 y blades have a forward curvature, it is to be understood that this is only by way of illustration and not by way of limitation.'

Referring now in detail to that embodiment of the invention illustrated in Figs. l, 2 and 3 of 10 the accompanying drawing: 5 indicates the circular backing plate of the impeller, having a central hub 6 whereby the impeller may be mounted upon and secured to an associated driving shaft, not shown. 1 indicates the shroud or front ring 15 of the impeller which is spaced axially from the backing plate and has an outside diameter approximating that ofthe backing plate.

8 indicates the blades of the impeller which are disposed between the marginal part of the 20 backing plate and the shroud and are iixed at their ends thereto. Asherein shown, the backing plate, the shroud and the blades are made as an integral casting.

Each blade is substantially of a triangular 25 cross-section in that it has two sides or surfaces 9 and IIJ respectively and a base Il, the base being at the outer end of the blade and the apex being at the inner end of the blade. As shown in Figs. 1 and 3, one side surface of each blade is convex and the other is made concave. The said convexed and concaved surfaces coact to provide an air passage l2 between adjacent blades and said passage is of a greater cross sectional area at its inner or inlet end than it is at its 35 outer or outlet end. The curvature of said surfaces is such that the passages each decrease in cross sectional area toward the outlet end and this decrease is in substantial accordance with the increase in the velocity of the air passing 40 i through the passages.

. It is preferred that these curved surfaces each be an arc of a circle of the same radius, but on different centers, as best appears by the two comparison lines I3 and Il in Fig. 3. While the 45 blades are herein shown as of solid cross section, they may be made hollow, if so desired.

In Fig. 4 I have illustrated a modied form of the invention wherein the side surfaces 9a and Illa respectively of the blades 8a are at instead of curved. These surfaces thus dene straight sided passages I2a: which converge'toward the outlet end of the passage to restrict the same so that the area ofsaid passage decreases from the outlet to the inlet end of the passage as in form first described.

In the rotation of the impeller, the air is accel erated Within that area of the impeller inwardly of the blades and moves in the direction of the inlet ends of the passages. As each passage is restricted towards its outlet end, this compensates for the progressively smaller space required because of the increase in velocity and thus voids are reduced and shock and impact upon the blade surfaces is greatly minimized. Also, as the air passes through the outlet end of the passages, eddy currents and vacuous conditions are avoided at the outlet, which in the conventionai fan inrpeller manifest themselves as noise and drag that impair impeller ethciency. Thus, the :dow of the air through the passages is uniform and the air is dischargedl as a continuous blast or jet all around the periphery of the impeller without noise or appreciable loss in operating efficiency.

While in describing my invention I have referred in detail to the form, arrangement and construction of the various parts thereof, the same the Yis to be considered only in the illustrative sense so that i do not wish to be limited thereto, except as may be specically set forth in the appended claims.

I claim as my invention:

1. A blower fan impeller embodying therein a plurality of blades arranged in spaced relation about the periphery of the impeller, the opposed surfaces of adjacent blades defining air passages, which decrease in area from the inlet end to the outlet end to compensate for the progressively smaller space required because: of the increase in velocity of the air passing therethrough.

2. A blower fan impeller embodying therein a plurality of blades arranged in spaced relation about the periphery of the impeller, the opposed V surfaces of adjacent blades defining air passages which decrease in width from the inlet end to the outlet end of each passage to compensate for the progressively smaller space required because of the increase in the velocity of air passing therethrough.

3. A blower man impeller embodying therein a plurality of blades arranged in spaced relation about the periphery of the impeller, each blade having an active convexed surface and an active concaved surface, the convened surface of one blade and the concaved surface of the adjacent blade defining an air passageway between said blades and which air passage decreases in area from the inlet end to the outlet end to compensate for the progressively smaller space required because of the increase in velocity of the air passing therethrough.

4. A blower fan impeller embodying therein a plurality of blades arranged in spaced relation about the periphery of the impeller, each blade being of substantially triangular cross section with the apex at the inner end and the base at the outer end, the opposed surfaces of adjacent'blades defining air passages which gradually decrease in cross sectional area from the inlet end to the outlet end.

5. A blower fan impeller embodying therein a backing plate and a plurality of blades arranged in spaced relation about and integral at one end with the backing plate, a shroud connecting the other ends of said blades together, the opposed surfaces of adjacent blades dening air passages which decrease in area. from the inlet end to the outlet end to compensate for the progressively smaller space required because of the increase in velocity of the air passing therethrough 6. A blower fan impeller comprising an inte grally cast structure embodying therein a backing plate, a shroud spaced axially therefrom and a plurality of blades arranged in arcuately spaced relation between the marginal part of the backing plate and said shroud, the opposed surfaces of adjacent blades defining air passages of progressively reducing area from the inlet end to the outlet end to compensate for the progressively smaller space required because of the increase in velocity of the air passing therethrough.-

7. A blower fan comprising an integrally cast structure embodying therein a backing plate, a

- shroud spaced axially therefrom arid a plurality of blades arranged in arcuately spaced relation between the marginal part of the backing plate and said shroud, each blade having a convexed surface and a concaved surface, the convexed surface of said blades coacting with the concaved surfaces of the adjacent blades in forming air passage between said blades, and which air passages decrease in area from the inlet end to the outlet end to compensate for the progressively smaller space required because of the increase in velocity of the air passing therethrough.

8. A blower fan impeller embodying therein a plurality of blades arranged in spaced relation about the periphery of the impeller, each blade having an active convexed surface and an active concaved surface, the convexed and the concave surfaces of each blade being made on a curve of substantially the same radius but on different centers, the opposed surfaces of adjacent blades dening air passages which decrease in ara from the inlet tc the outlet end to compensate for the progressively smaller space required because of the increase in velocity of air passing therethrough.

ROBERT E. BRESSLER.

US130968A 1937-03-15 1937-03-15 Blower fan impeller Expired - Lifetime US2138814A (en)

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Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2652190A (en) * 1950-01-23 1953-09-15 Master Appliance Mfg Co Impeller wheel
US2948524A (en) * 1957-02-18 1960-08-09 Metal Pumping Services Inc Pump for molten metal
US3130481A (en) * 1959-03-14 1964-04-28 Ahlen Karl Gustav Method of manufacturing a blade wheel
US3144204A (en) * 1962-08-24 1964-08-11 Acme Engineering And Mfg Corp Centrifugal blower wheel
US3893817A (en) * 1973-01-02 1975-07-08 Outboard Marine Corp Die castable centrifugal fan
US4165950A (en) * 1976-09-06 1979-08-28 Hitachi, Ltd. Fan having forward-curved blades
US4826402A (en) * 1986-03-28 1989-05-02 Nachtrieb Paul W High-capacity centrifugal pump
EP0350408A2 (en) * 1988-07-07 1990-01-10 Societe D' Investissement Et D' Innovation Industriels Suction device for kitchen extractor, air cleaner and extractor containing such a device
US5633083A (en) * 1989-03-14 1997-05-27 Sunstar Kabushiki Toothbrush
WO2001002701A1 (en) * 1999-07-06 2001-01-11 Girgis, Sami, E. Rotary ram fluid pressurizing machine
US20050191173A1 (en) * 2003-09-23 2005-09-01 Awdalla Essam T. Rotary ram-in compressor
US20070212211A1 (en) * 2006-03-09 2007-09-13 Sony Corporation Cross flow fan apparatus, electronic apparatus and impeller
US20080253884A1 (en) * 2007-04-12 2008-10-16 United Technologies Corporation Out-flow margin protection for a gas turbine engine
US7906068B2 (en) 2003-07-14 2011-03-15 Cooper Paul V Support post system for molten metal pump
US8075837B2 (en) 2003-07-14 2011-12-13 Cooper Paul V Pump with rotating inlet
US8178037B2 (en) 2002-07-12 2012-05-15 Cooper Paul V System for releasing gas into molten metal
US8337746B2 (en) 2007-06-21 2012-12-25 Cooper Paul V Transferring molten metal from one structure to another
US8361379B2 (en) 2002-07-12 2013-01-29 Cooper Paul V Gas transfer foot
US8366993B2 (en) 2007-06-21 2013-02-05 Cooper Paul V System and method for degassing molten metal
US8444911B2 (en) 2009-08-07 2013-05-21 Paul V. Cooper Shaft and post tensioning device
US8449814B2 (en) 2009-08-07 2013-05-28 Paul V. Cooper Systems and methods for melting scrap metal
US8524146B2 (en) 2009-08-07 2013-09-03 Paul V. Cooper Rotary degassers and components therefor
US8529828B2 (en) 2002-07-12 2013-09-10 Paul V. Cooper Molten metal pump components
US8535603B2 (en) 2009-08-07 2013-09-17 Paul V. Cooper Rotary degasser and rotor therefor
US8613884B2 (en) 2007-06-21 2013-12-24 Paul V. Cooper Launder transfer insert and system
US8714914B2 (en) 2009-09-08 2014-05-06 Paul V. Cooper Molten metal pump filter
US9011761B2 (en) 2013-03-14 2015-04-21 Paul V. Cooper Ladle with transfer conduit
US9022731B2 (en) 2009-11-03 2015-05-05 Alessandro Seccareccia Centrifugal ceiling fan
US9108244B2 (en) 2009-09-09 2015-08-18 Paul V. Cooper Immersion heater for molten metal
US9156087B2 (en) 2007-06-21 2015-10-13 Molten Metal Equipment Innovations, Llc Molten metal transfer system and rotor
US9205490B2 (en) 2007-06-21 2015-12-08 Molten Metal Equipment Innovations, Llc Transfer well system and method for making same
US9410744B2 (en) 2010-05-12 2016-08-09 Molten Metal Equipment Innovations, Llc Vessel transfer insert and system
US9409232B2 (en) 2007-06-21 2016-08-09 Molten Metal Equipment Innovations, Llc Molten metal transfer vessel and method of construction
US9643247B2 (en) 2007-06-21 2017-05-09 Molten Metal Equipment Innovations, Llc Molten metal transfer and degassing system
US9903383B2 (en) 2013-03-13 2018-02-27 Molten Metal Equipment Innovations, Llc Molten metal rotor with hardened top
US10052688B2 (en) 2013-03-15 2018-08-21 Molten Metal Equipment Innovations, Llc Transfer pump launder system
US10138892B2 (en) 2014-07-02 2018-11-27 Molten Metal Equipment Innovations, Llc Rotor and rotor shaft for molten metal
US10267314B2 (en) 2016-01-13 2019-04-23 Molten Metal Equipment Innovations, Llc Tensioned support shaft and other molten metal devices
US10428821B2 (en) 2009-08-07 2019-10-01 Molten Metal Equipment Innovations, Llc Quick submergence molten metal pump

Cited By (84)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2652190A (en) * 1950-01-23 1953-09-15 Master Appliance Mfg Co Impeller wheel
US2948524A (en) * 1957-02-18 1960-08-09 Metal Pumping Services Inc Pump for molten metal
US3130481A (en) * 1959-03-14 1964-04-28 Ahlen Karl Gustav Method of manufacturing a blade wheel
US3144204A (en) * 1962-08-24 1964-08-11 Acme Engineering And Mfg Corp Centrifugal blower wheel
US3893817A (en) * 1973-01-02 1975-07-08 Outboard Marine Corp Die castable centrifugal fan
US4165950A (en) * 1976-09-06 1979-08-28 Hitachi, Ltd. Fan having forward-curved blades
US4826402A (en) * 1986-03-28 1989-05-02 Nachtrieb Paul W High-capacity centrifugal pump
EP0350408A2 (en) * 1988-07-07 1990-01-10 Societe D' Investissement Et D' Innovation Industriels Suction device for kitchen extractor, air cleaner and extractor containing such a device
FR2633983A1 (en) * 1988-07-07 1990-01-12 Invest Indl Immobilier Suction device for kitchen hood, air purifier and analogs, and hood having such a device
EP0350408A3 (en) * 1988-07-07 1990-03-28 Societe D' Investissement Et D' Innovation Industriels Suction device for kitchen extractor, air cleaner and extractor containing such a device
US4936288A (en) * 1988-07-07 1990-06-26 Societe d'Investissement et d'Innovation Industriels S. I.I.I. Exhaust device for kitchen hood, air purifier and the like, and hood comprising such a device
US5633083A (en) * 1989-03-14 1997-05-27 Sunstar Kabushiki Toothbrush
WO2001002701A1 (en) * 1999-07-06 2001-01-11 Girgis, Sami, E. Rotary ram fluid pressurizing machine
US9435343B2 (en) 2002-07-12 2016-09-06 Molten Meal Equipment Innovations, LLC Gas-transfer foot
US8529828B2 (en) 2002-07-12 2013-09-10 Paul V. Cooper Molten metal pump components
US8440135B2 (en) 2002-07-12 2013-05-14 Paul V. Cooper System for releasing gas into molten metal
US8409495B2 (en) 2002-07-12 2013-04-02 Paul V. Cooper Rotor with inlet perimeters
US9034244B2 (en) 2002-07-12 2015-05-19 Paul V. Cooper Gas-transfer foot
US8110141B2 (en) 2002-07-12 2012-02-07 Cooper Paul V Pump with rotating inlet
US8178037B2 (en) 2002-07-12 2012-05-15 Cooper Paul V System for releasing gas into molten metal
US8361379B2 (en) 2002-07-12 2013-01-29 Cooper Paul V Gas transfer foot
US8475708B2 (en) 2003-07-14 2013-07-02 Paul V. Cooper Support post clamps for molten metal pumps
US8075837B2 (en) 2003-07-14 2011-12-13 Cooper Paul V Pump with rotating inlet
US7906068B2 (en) 2003-07-14 2011-03-15 Cooper Paul V Support post system for molten metal pump
US8501084B2 (en) 2003-07-14 2013-08-06 Paul V. Cooper Support posts for molten metal pumps
US20050191173A1 (en) * 2003-09-23 2005-09-01 Awdalla Essam T. Rotary ram-in compressor
US20070212211A1 (en) * 2006-03-09 2007-09-13 Sony Corporation Cross flow fan apparatus, electronic apparatus and impeller
US20080253884A1 (en) * 2007-04-12 2008-10-16 United Technologies Corporation Out-flow margin protection for a gas turbine engine
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US10274256B2 (en) 2007-06-21 2019-04-30 Molten Metal Equipment Innovations, Llc Vessel transfer systems and devices
US8613884B2 (en) 2007-06-21 2013-12-24 Paul V. Cooper Launder transfer insert and system
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US8753563B2 (en) 2007-06-21 2014-06-17 Paul V. Cooper System and method for degassing molten metal
US10072891B2 (en) 2007-06-21 2018-09-11 Molten Metal Equipment Innovations, Llc Transferring molten metal using non-gravity assist launder
US9017597B2 (en) 2007-06-21 2015-04-28 Paul V. Cooper Transferring molten metal using non-gravity assist launder
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US8366993B2 (en) 2007-06-21 2013-02-05 Cooper Paul V System and method for degassing molten metal
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US9022731B2 (en) 2009-11-03 2015-05-05 Alessandro Seccareccia Centrifugal ceiling fan
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