US3845903A - One piece radial vane diffuser and method of manufacturing the same - Google Patents

One piece radial vane diffuser and method of manufacturing the same Download PDF

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US3845903A
US3845903A US00388669A US38866973A US3845903A US 3845903 A US3845903 A US 3845903A US 00388669 A US00388669 A US 00388669A US 38866973 A US38866973 A US 38866973A US 3845903 A US3845903 A US 3845903A
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vanes
radial
rim
vane diffuser
cone
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US00388669A
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F Runninger
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Dunham Bush Inc
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Dunham Bush Inc
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  A CARRIER GAS OR AIR 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
    • F23C7/004—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion using vanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D53/00—Making other particular articles
    • B21D53/78—Making other particular articles propeller blades; turbine blades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D11/00—Burners using a direct spraying action of liquid droplets or vaporised liquid into the combustion space
    • F23D11/36—Details, e.g. burner cooling means, noise reduction means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/4932—Turbomachine making
    • Y10T29/49325—Shaping integrally bladed rotor

Definitions

  • Patent Runninger 1 ONE PIECE RADIAL VANE DIFFUSER AND METHOD OF MANUFACTURING THE SAME [75] Inventor: Frederick L. Rnnninger,
  • a one piece radial vane diffuser constitutes an annular array of curved, radially directed vanes, surrounding the combustion area of a fuel oil burner, downstream of the nozzle, and at the downstream end of a cylinder defining a primary air flow path concentric with the nozzle.
  • a circular sheet metal sheet is first drawn into a cone, the vanes are lanced from the cone to form a circumferential array of integral, radially directed, side by side, generally rectangular vanes linked to an annular rim at their radial outermost ends by an integral hinge.
  • the cone is then flattened, at least in the area of the vanes, to cause the vanes to move into edge overlapping position and preferably the vanes are bent or twisted about a radial axis passing through the hinge to provide air passages between vanes of predetermined size.
  • the vanes may be curved relative to their radial axes to effect swirling of the primary-air flow.
  • This invention relates to fuel oil burners, and more particularly, to acne piece radial vane diffuser and its SUMMARY OF THE INVENTION
  • the present invention is directed to forming such a radial vane diffuser from a single circular plate of sheet metal.
  • a circular, flat sheet metal plate is first drawn into a cone, and the cone is then lanced to form an annular outer rim and a plurality of integral, circumferentially spaced, radially directed and generally rectangular vanes joined to the rim only at their radially outermost ends by an integral hinge.
  • the lanced cone at least in the area of the vanes, is flattened to cause the vanes to move into edge overlapping position.
  • the vanes are bent at their hinges about a radial axis passing through the vanes to form air passages of predetermined size and configuration between vanes to control the primary air flow.
  • a portion of the rim adjacent the hinges is also flattened with the vanes, while the outermost peripheral portion of the rim is maintained at right angles thereto, to assist mounting of the rim within the cylinder definingthe secondary air flow path.
  • the vanes may be curved about their radial pivot axes to cause the primary air flow passing therethrough to spiral at the exit end of the one piece diffuser.
  • FIG. 1 is a side elevational view of a circular, flat sheet of metal forming the one piece radial vane diffuser subsequent to having at least its center drawn into conical form and lanced to form the individual vanes prior to flattening of the conical portion of the plate.
  • FIG. 2 is a right hand, end elevational view of the drawn sheet from the right side of FIG. 1.
  • FIG. 3 is a similar, end view of the one piece diffuser formed from the sheet of FIGS. 1 and 2, after flattening of the conical portion, twisting of the vanes about their integral hinges and curving of the individual vanes about a radial vane axis.
  • FIG. 4 is a vertical sectional view of the diffuser of FIG. 3 taken about line 44.
  • Hinges 34 join the vanes 22 to rim portion 14, initially through a remnant annular portion 36 of the cone portion 12 of the diffuser sheet 10. Because the effect of drawing the flat circular sheet forming diffuser 10, into at least a partial cone, increases the surface area, subsequent to the lancing of the conical area to define the vanes 22, the flattening of at least the vanes of cone portion 12 causes the individual vanes to overlapp. Thus, as seen in FIG. 4, edge 26 of each of the vanes overlaps edge 24 of the next succeeding vane in a clockwise direction.
  • the individual vanes are preferably twisted or bent about their hinges 34 to define flow passage 30 between the individual vanes, and further, the individual vanes 26 are preferably curved about a radial axis. In twisting or bending the individual vanes 22 about a radial axis, relative to each vane, it is preferred that the bend or twist take place about a line passing along edge 24 of each vane which intersects end portion 32.
  • the finished one piece radial vane diffuser consists of a narrow circular rim which may be of a diameter on the order of the cylindrical member (and not shown) defining the primary air path which acts to support the one piece radial vane diffuser I0 therewithin.
  • the formerly conical portion 12 of the diffuser is flattened such that the annular portion 36 of the diffuser I0 is at right angles to mounting rim l4 and it is from this portion 36 that the curved radial vanes 22 emanate.
  • the effect of the curved vanes and their spacing is to insure movement of the primary air flow into a spiral or helical path downstream of the diffuser 10 to effect greater mixing with the fuel oil from the nozzle and to promote excellent combustion of the fuel and air mixture downstream of diffuser 10, that is, in a direction to the left of the diffuser 10 in FIG. 4.
  • the diffuser may be formed of any sheet metal capable of withstanding the high temperature effects of into conical shape, the sheet metal plate is lanced irregcombustion downstream of the nozzle but must be of a metal permitting: the drawing of the cone from the flat sheet, the subsequent lancing to form the individual vanes 22 forming an outer circular array, the bending or twisting of the individual vanes about the integral hinges 34 and the curving of the vanes 22 about a radial axis passing therethrough by the method of manufacture of the present invention.
  • a one piece radial vane diffuser comprising: a circular metal sheet including an annular rim, a plurality of circumferentially spaced radial vanes partially struck from said sheet and being joined to said rim at their radially outermost ends by hinges integral with said rim, said vanes being of a width so as to overlap at their side edges, and said vanes being similarly twisted at said hinges, about a radial axis extending through said hinges to form air passages therebetween.
  • vanes comprise sectors of said sheet and are severed therefrom except along one side edge of said vanes at their radial outer ends, with said vanes being twisted about a radial axis which coincides with said one side edge of said vanes.
  • a method of manufacturing a one piece radial vane diffuser comprising the steps of:
  • a method of manufacturing a one piece radial vane diffuser from a unitary sheet metal plate comprising the steps of:

Abstract

A one piece radial vane diffuser constitutes an annular array of curved, radially directed vanes, surrounding the combustion area of a fuel oil burner, downstream of the nozzle, and at the downstream end of a cylinder defining a primary air flow path concentric with the nozzle. A circular sheet metal sheet is first drawn into a cone, the vanes are lanced from the cone to form a circumferential array of integral, radially directed, side by side, generally rectangular vanes linked to an annular rim at their radial outermost ends by an integral hinge. The cone is then flattened, at least in the area of the vanes, to cause the vanes to move into edge overlapping position and preferably the vanes are bent or twisted about a radial axis passing through the hinge to provide air passages between vanes of predetermined size. The vanes may be curved relative to their radial axes to effect swirling of the primary air flow.

Description

it tates Patent Runninger 1 ONE PIECE RADIAL VANE DIFFUSER AND METHOD OF MANUFACTURING THE SAME [75] Inventor: Frederick L. Rnnninger,
l-larrisonburg, Va.
[73] Assignee: Dunham-Bush,lnc., Harrisonburg,
22 Filed: Aug. 15,1973
[21] Appl. No.: 388,669
[56] References Cited UNITED STATES PATENTS 1,991,894 2/1935 Forney 239/399 3,309,027 3/1967 Chadwick et a1... 239/406 3,383,052 5/1968 Qysart et al. 239/406 X 3,650,477 3/1972 Tiullikssonii ..239/399 X I FOREIGN PATENTS OR APPLICATIONS 651,400 10/1962 Canada 431/265 Nov. 5, 1974 205.892 l0/l923 Great Britain ..239/406 Primary Examiner-Robert S. Ward, Jr. Attorney, Agent, or FirmSughrue, Rothwell, Mion, Zinn & Macpeak [5 7 ABSTRACT A one piece radial vane diffuser constitutes an annular array of curved, radially directed vanes, surrounding the combustion area of a fuel oil burner, downstream of the nozzle, and at the downstream end of a cylinder defining a primary air flow path concentric with the nozzle. A circular sheet metal sheet is first drawn into a cone, the vanes are lanced from the cone to form a circumferential array of integral, radially directed, side by side, generally rectangular vanes linked to an annular rim at their radial outermost ends by an integral hinge. The cone is then flattened, at least in the area of the vanes, to cause the vanes to move into edge overlapping position and preferably the vanes are bent or twisted about a radial axis passing through the hinge to provide air passages between vanes of predetermined size. The vanes may be curved relative to their radial axes to effect swirling of the primary-air flow.
10 Claims, 4 Drawing Figures BACKGROUND OF THE INVENTION FIELD OF THE INVENTION This invention relates to fuel oil burners, and more particularly, to acne piece radial vane diffuser and its SUMMARY OF THE INVENTION The present invention is directed to forming such a radial vane diffuser from a single circular plate of sheet metal. A circular, flat sheet metal plate is first drawn into a cone, and the cone is then lanced to form an annular outer rim and a plurality of integral, circumferentially spaced, radially directed and generally rectangular vanes joined to the rim only at their radially outermost ends by an integral hinge. The lanced cone, at least in the area of the vanes, is flattened to cause the vanes to move into edge overlapping position. Preferably the vanes are bent at their hinges about a radial axis passing through the vanes to form air passages of predetermined size and configuration between vanes to control the primary air flow. Preferably, a portion of the rim adjacent the hinges is also flattened with the vanes, while the outermost peripheral portion of the rim is maintained at right angles thereto, to assist mounting of the rim within the cylinder definingthe secondary air flow path. Further, the vanes may be curved about their radial pivot axes to cause the primary air flow passing therethrough to spiral at the exit end of the one piece diffuser.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side elevational view of a circular, flat sheet of metal forming the one piece radial vane diffuser subsequent to having at least its center drawn into conical form and lanced to form the individual vanes prior to flattening of the conical portion of the plate.
FIG. 2 is a right hand, end elevational view of the drawn sheet from the right side of FIG. 1.
FIG. 3 is a similar, end view of the one piece diffuser formed from the sheet of FIGS. 1 and 2, after flattening of the conical portion, twisting of the vanes about their integral hinges and curving of the individual vanes about a radial vane axis.
FIG. 4 is a vertical sectional view of the diffuser of FIG. 3 taken about line 44.
DESCRIPTION OF THE PREFERRED EMBODIMENT joined to an annular rim 14 which terminates at its periphery in a radially outwardly turned edge 16. Further, subsequent to drawing at least portion 12 of the sheet 2 ularly, that is, severed along severance lines 18 which define a large central opening 20, FIG. 2, to form a plurality of radial vanes 22 defined by side edges 24 and 26, a radially inner edge 28 and a radially outer edge 30, the radially outer edge 30 being joined to side edge 26 by a tapered edge portion 32 which acts in conjunction with the severance lines 18 to form integral hinges 34. Hinges 34 join the vanes 22 to rim portion 14, initially through a remnant annular portion 36 of the cone portion 12 of the diffuser sheet 10. Because the effect of drawing the flat circular sheet forming diffuser 10, into at least a partial cone, increases the surface area, subsequent to the lancing of the conical area to define the vanes 22, the flattening of at least the vanes of cone portion 12 causes the individual vanes to overlapp. Thus, as seen in FIG. 4, edge 26 of each of the vanes overlaps edge 24 of the next succeeding vane in a clockwise direction. Simultaneous with flattening of the conical section 12, the individual vanes are preferably twisted or bent about their hinges 34 to define flow passage 30 between the individual vanes, and further, the individual vanes 26 are preferably curved about a radial axis. In twisting or bending the individual vanes 22 about a radial axis, relative to each vane, it is preferred that the bend or twist take place about a line passing along edge 24 of each vane which intersects end portion 32.
Preferably, as seen in FIG. 4, the finished one piece radial vane diffuser consists of a narrow circular rim which may be of a diameter on the order of the cylindrical member (and not shown) defining the primary air path which acts to support the one piece radial vane diffuser I0 therewithin. The formerly conical portion 12 of the diffuser is flattened such that the annular portion 36 of the diffuser I0 is at right angles to mounting rim l4 and it is from this portion 36 that the curved radial vanes 22 emanate. The effect of the curved vanes and their spacing is to insure movement of the primary air flow into a spiral or helical path downstream of the diffuser 10 to effect greater mixing with the fuel oil from the nozzle and to promote excellent combustion of the fuel and air mixture downstream of diffuser 10, that is, in a direction to the left of the diffuser 10 in FIG. 4.
The diffuser may be formed of any sheet metal capable of withstanding the high temperature effects of into conical shape, the sheet metal plate is lanced irregcombustion downstream of the nozzle but must be of a metal permitting: the drawing of the cone from the flat sheet, the subsequent lancing to form the individual vanes 22 forming an outer circular array, the bending or twisting of the individual vanes about the integral hinges 34 and the curving of the vanes 22 about a radial axis passing therethrough by the method of manufacture of the present invention.
While the invention has been particularly shown and described with reference to a preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
What is claimed is:
l. A one piece radial vane diffuser comprising: a circular metal sheet including an annular rim, a plurality of circumferentially spaced radial vanes partially struck from said sheet and being joined to said rim at their radially outermost ends by hinges integral with said rim, said vanes being of a width so as to overlap at their side edges, and said vanes being similarly twisted at said hinges, about a radial axis extending through said hinges to form air passages therebetween.
2. The radial vane diffuser as claimed in claim 1, wherein said vanes comprise sectors of said sheet and are severed therefrom except along one side edge of said vanes at their radial outer ends, with said vanes being twisted about a radial axis which coincides with said one side edge of said vanes.
3. The radial vane diffuser as claimed in claim 1, wherein the radially outer ends of said other side edge of each vane are tapered toward said one side edge thereof to form said hinge.
4. The radial vane diffuser as claimed in claim 2, wherein the radially outer ends of said other side edge of each vane are tapered toward said one side edge thereof to form said hinge.
5. A method of manufacturing a one piece radial vane diffuser comprising the steps of:
forming at least an interior portion of a circular flat sheet of metal into a cone,
lancing the cone to form an annular outer rim and a circumferential array of integral, radially directed, generally rectangular vanes joined to said rim only at their radially outermost ends, and
flattening at least that portion of said cone forming said vanes to cause said vanes to move into edge overlapping position.
6. The method of manufacturing a one piece radial vane diffuser as claimed in claim 5, further comprising twisting said vanes about a radial axis passing through the vanes to form air passages between vanes.
7. The method of manufacturing a one piece radial vane diffuser as claimed in claim 5, further comprising curving each vane about a radial axis thereof to cause swirl of the air flow passing through the air passages between vanes.
8. The method of manufacturing a one piece radial vane diffuser as claimed in claim 6, further comprising curving each vane about a radial axis thereof to cause swirl of the air flow passing through the air passages between vanes.
9. The method of manufacturing a one piece radial vane diffuser as claimed in claim 5, wherein the radially inner portion of said rim coupled to said vanes, is flattened along with said vanes at right angles to the radially outer peripheral portion of said sheet to define a circular, axially directed rim portion generally at right angles to the vanes and said inner rim portion.
10. A method of manufacturing a one piece radial vane diffuser from a unitary sheet metal plate comprising the steps of:
drawing said flat metal plate into conical form with a cylindrical rim portion at its outer periphery,
lancing the conical portion to form an unsevered intermediate annular portion and a circumferentially array of integral, radially directed generally rectangular vanes joined to said intermediate annular portion only at their radially outermost ends by an integral hinge portion, and
flattening the portion of said cone including said vanes and said intermediate annular portion to form an annular portion at right angles to said cylindrical rim and a plurality of circumferentially spaced edge overlapping vanes and curving said vanes about radial axes passing through the vanes to form axial air passages therebetween of predetermined size and configuration,
whereby, the air swirls as it exits the air passages be tween the vanes and enters the axial passage determined by said cylindrical rim.

Claims (10)

1. A one piece radiaL vane diffuser comprising: a circular metal sheet including an annular rim, a plurality of circumferentially spaced radial vanes partially struck from said sheet and being joined to said rim at their radially outermost ends by hinges integral with said rim, said vanes being of a width so as to overlap at their side edges, and said vanes being similarly twisted at said hinges, about a radial axis extending through said hinges to form air passages therebetween.
2. The radial vane diffuser as claimed in claim 1, wherein said vanes comprise sectors of said sheet and are severed therefrom except along one side edge of said vanes at their radial outer ends, with said vanes being twisted about a radial axis which coincides with said one side edge of said vanes.
3. The radial vane diffuser as claimed in claim 1, wherein the radially outer ends of said other side edge of each vane are tapered toward said one side edge thereof to form said hinge.
4. The radial vane diffuser as claimed in claim 2, wherein the radially outer ends of said other side edge of each vane are tapered toward said one side edge thereof to form said hinge.
5. A method of manufacturing a one piece radial vane diffuser comprising the steps of: forming at least an interior portion of a circular flat sheet of metal into a cone, lancing the cone to form an annular outer rim and a circumferential array of integral, radially directed, generally rectangular vanes joined to said rim only at their radially outermost ends, and flattening at least that portion of said cone forming said vanes to cause said vanes to move into edge overlapping position.
6. The method of manufacturing a one piece radial vane diffuser as claimed in claim 5, further comprising twisting said vanes about a radial axis passing through the vanes to form air passages between vanes.
7. The method of manufacturing a one piece radial vane diffuser as claimed in claim 5, further comprising curving each vane about a radial axis thereof to cause swirl of the air flow passing through the air passages between vanes.
8. The method of manufacturing a one piece radial vane diffuser as claimed in claim 6, further comprising curving each vane about a radial axis thereof to cause swirl of the air flow passing through the air passages between vanes.
9. The method of manufacturing a one piece radial vane diffuser as claimed in claim 5, wherein the radially inner portion of said rim coupled to said vanes, is flattened along with said vanes at right angles to the radially outer peripheral portion of said sheet to define a circular, axially directed rim portion generally at right angles to the vanes and said inner rim portion.
10. A method of manufacturing a one piece radial vane diffuser from a unitary sheet metal plate comprising the steps of: drawing said flat metal plate into conical form with a cylindrical rim portion at its outer periphery, lancing the conical portion to form an unsevered intermediate annular portion and a circumferentially array of integral, radially directed generally rectangular vanes joined to said intermediate annular portion only at their radially outermost ends by an integral hinge portion, and flattening the portion of said cone including said vanes and said intermediate annular portion to form an annular portion at right angles to said cylindrical rim and a plurality of circumferentially spaced edge overlapping vanes and curving said vanes about radial axes passing through the vanes to form axial air passages therebetween of predetermined size and configuration, whereby, the air swirls as it exits the air passages between the vanes and enters the axial passage determined by said cylindrical rim.
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975141A (en) * 1974-06-25 1976-08-17 The United States Of America As Represented By The Secretary Of The Army Combustion liner swirler
US4370876A (en) * 1978-12-11 1983-02-01 Ballard James W Methods of constructing a one-piece roof vent device
EP0857528A2 (en) * 1997-02-04 1998-08-12 CORAL S.p.A. Method of producing a sheet metal fan, and fan produced thereby
US6029347A (en) * 1995-08-30 2000-02-29 Societe Europenne De Propulsion Method of manufacturing a turbine of thermostructural composite material, in particular of small diameter
US6123051A (en) * 1998-08-12 2000-09-26 Chrysler Corporation Shroud for an engine cooling fan
US20070042307A1 (en) * 2004-02-12 2007-02-22 Alstom Technology Ltd Premix burner arrangement for operating a combustion chamber and method for operating a combustion chamber
US20130305800A1 (en) * 2009-04-21 2013-11-21 Medtronic, Inc. Stents For Prosthetic Heart Valves and Methods of Making Same
EP3296462B1 (en) 2016-09-16 2018-09-05 Benninghoven GmbH & Co.KG Mülheim Assembly and method for manufacturing asphalt
US11878133B2 (en) 2019-10-08 2024-01-23 Medtronic, Inc. Methods of preparing balloon expandable catheters for cardiac and vascular interventions

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Publication number Priority date Publication date Assignee Title
GB205892A (en) * 1922-07-26 1923-10-26 Simplex Fuel Oil Engineering C Improvements in and relating to air-controlling devices for fueloil burning systems
US1991894A (en) * 1931-08-26 1935-02-19 Ross H Forney Combination gas and oil burner
CA651400A (en) * 1962-10-30 John Wood Company Limited Oil burner
US3309027A (en) * 1964-12-18 1967-03-14 American Radiator & Standard Oil burner
US3383052A (en) * 1966-06-28 1968-05-14 Union Oil Co Burner end cone having two different types of vanes
US3650477A (en) * 1969-11-04 1972-03-21 Sovereign Finanz Ag Choke

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA651400A (en) * 1962-10-30 John Wood Company Limited Oil burner
GB205892A (en) * 1922-07-26 1923-10-26 Simplex Fuel Oil Engineering C Improvements in and relating to air-controlling devices for fueloil burning systems
US1991894A (en) * 1931-08-26 1935-02-19 Ross H Forney Combination gas and oil burner
US3309027A (en) * 1964-12-18 1967-03-14 American Radiator & Standard Oil burner
US3383052A (en) * 1966-06-28 1968-05-14 Union Oil Co Burner end cone having two different types of vanes
US3650477A (en) * 1969-11-04 1972-03-21 Sovereign Finanz Ag Choke

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3975141A (en) * 1974-06-25 1976-08-17 The United States Of America As Represented By The Secretary Of The Army Combustion liner swirler
US4370876A (en) * 1978-12-11 1983-02-01 Ballard James W Methods of constructing a one-piece roof vent device
US6029347A (en) * 1995-08-30 2000-02-29 Societe Europenne De Propulsion Method of manufacturing a turbine of thermostructural composite material, in particular of small diameter
EP0857528A2 (en) * 1997-02-04 1998-08-12 CORAL S.p.A. Method of producing a sheet metal fan, and fan produced thereby
EP0857528A3 (en) * 1997-02-04 1999-06-23 CORAL S.p.A. Method of producing a sheet metal fan, and fan produced thereby
US6123051A (en) * 1998-08-12 2000-09-26 Chrysler Corporation Shroud for an engine cooling fan
US20070042307A1 (en) * 2004-02-12 2007-02-22 Alstom Technology Ltd Premix burner arrangement for operating a combustion chamber and method for operating a combustion chamber
US20130305800A1 (en) * 2009-04-21 2013-11-21 Medtronic, Inc. Stents For Prosthetic Heart Valves and Methods of Making Same
US9561119B2 (en) * 2009-04-21 2017-02-07 Medtronic, Inc. Stents for prosthetic heart valves and methods of making same
US10729540B2 (en) 2009-04-21 2020-08-04 Medtronic, Inc. Stents for prosthetic heart valves and methods of making same
US11654022B2 (en) 2009-04-21 2023-05-23 Medtronic, Inc. Stents for prosthetic heart valves and methods of making same
EP3296462B1 (en) 2016-09-16 2018-09-05 Benninghoven GmbH & Co.KG Mülheim Assembly and method for manufacturing asphalt
US11878133B2 (en) 2019-10-08 2024-01-23 Medtronic, Inc. Methods of preparing balloon expandable catheters for cardiac and vascular interventions

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