EP0857528B1 - Verfahren zum Herstellen eines Metallblechventilators und so hergestellter Ventilator - Google Patents

Verfahren zum Herstellen eines Metallblechventilators und so hergestellter Ventilator Download PDF

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Publication number
EP0857528B1
EP0857528B1 EP98101839A EP98101839A EP0857528B1 EP 0857528 B1 EP0857528 B1 EP 0857528B1 EP 98101839 A EP98101839 A EP 98101839A EP 98101839 A EP98101839 A EP 98101839A EP 0857528 B1 EP0857528 B1 EP 0857528B1
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EP
European Patent Office
Prior art keywords
fan
blades
lateral walls
undulations
sheet metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98101839A
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English (en)
French (fr)
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EP0857528A2 (de
EP0857528A3 (de
Inventor
Erminio Coral
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Coral SpA
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Coral SpA
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Publication date
Application filed by Coral SpA filed Critical Coral SpA
Publication of EP0857528A2 publication Critical patent/EP0857528A2/de
Publication of EP0857528A3 publication Critical patent/EP0857528A3/de
Application granted granted Critical
Publication of EP0857528B1 publication Critical patent/EP0857528B1/de
Anticipated expiration legal-status Critical
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Classifications

    • 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

Definitions

  • the present invention relates to a method of producing a sheet metal fan, and to a sheet metal fan produced using such a method (see for example US-A-3 845 903).
  • One known method of producing such fans is to first prepare a sheet metal disk with a central hole for housing a hub; separately cut and bend a number of sheet metal blades; and finally weld or rivet the blades perpendicularly to the disk.
  • Another known method is to prepare a number of radial elements with a substantially L-shaped circumferential section; and fit the radial L-shaped elements together by welding or riveting the edge of the L of one element to the edge of one wing of the angularly adjacent element, so that the joined wings of the L-shaped elements form a flat disk, and the wings perpendicular to them form the actual blades of the fan.
  • edges of the blades and/or the rivets create turbulent air or gas flow, so that the fans are extremely noisy and consume an excessive amount of electric power.
  • actual manufacture is a long painstaking job requiring skilled labour, so that the fans are fairly expensive to produce.
  • a method of producing a sheet metal fan characterized by comprising the steps of:
  • a sheet metal fan characterized by being formed in one piece, and by comprising undulations alternating with cavities; said undulations defining at least a first number of blades of said fan.
  • Number 6 in Figure 1 indicates as a whole a first fan produced using the method according to the present invention.
  • Fan 6 is made in one piece from appropriately thick sheet metal, and comprises a number of blades 7 extending radially with respect to an axis 8 and alternating with cavities 9 having a trapezoidal circumferential section.
  • each blade 7 tapers axially, has a substantially V-shaped circumferential section, and comprises a pair of facing, converging lateral walls 11, and a connecting wall 12 connecting lateral walls 11 and having, when viewed from above, a substantially straight profile.
  • Connecting wall 12 comprises an outer first portion 13 having generating lines substantially perpendicular to axis 8; and an inner second portion 14 having generating lines sloping and converging towards a central hole 16.
  • each cavity 9 is larger than each blade 7 measured along the same peripheral line, and is defined by two lateral walls 11 of the angularly adjacent blades 7, and by a flat, substantially sector-shaped bottom wall 17.
  • Sector-shaped walls 17 are coplanar with one another, and blades 7 extend from the same side of fan 6 with respect to the plane of bottom walls 17.
  • Fan 6 of the above type is known technically as a "high-pressure straight-bladed single-intake fan" by comprising one intake side - the side from which blades 7 extend - and by connecting walls 12 having, when viewed from above, a substantially straight profile.
  • Number 20 in Figure 2 indicates a second fan produced using the method according to the present invention, and which is substantially similar to fan 6 in Figure 1, except that, viewed from above, connecting wall 12 has a curved as opposed to a straight profile, so that fan 20 in Figure 2 is known technically as a "high-pressure curved-blade single-intake fan.”
  • Fan 6 in Figure 1 is produced using the method described below with reference to Figures 3-6.
  • the method by which fan 6 is produced comprises a first step of preparing, e.g. on a blanking press, a flat sheet metal disk 28 ( Figure 3) of predetermined diameter, and with a central hole 29 coaxial with axis 8 and larger in diameter than the desired central hole 16 of fan 6 in Figure 1.
  • the sheet may be of any metal suitable for cold drawing, and is selected of such a thickness as to ensure a certain amount of rigidity of fan 6.
  • Disk 28 is drawn using a first die 30 ( Figure 5) defined by two complementary half-dies 31, 32, which are fitted to a forming or drawing press (not shown) and moved to and from each other.
  • Half-die 31 has a number of radial elements or ribs 33 for forming respective first radial undulations 34 with, viewed from above, a substantially straight profile, and so obtaining a first semifinished part 36 also shown in Figure 4.
  • Half-die 32 in turn has a number of radial elements or ribs 38 for forming respective cavities 9 between first radial undulations 34 of semifinished part 36 and also having, when viewed from above, a substantially straight profile.
  • Half-die 31 also carries a number of locators 37 shown in section in Figure 5 for the sake of clarity, and which provide for centering disk 28 on half-die 31.
  • Disk 28 is first placed between locators 37 on half-die 31; and the press is activated to close die 30 and subject disk 28 to a first drawing operation to form radial undulations 34 and cavities 9 of semifinished part 36.
  • the drawing operation also reduces the diameter of hole 29, so that semifinished part 36 has a central hole 42 smaller in diameter than hole 29 of disk 28.
  • radial undulations 34 are formed by deforming portions of disk 28 in the same direction, and define the blades 7 of fan 6 in Figure 1.
  • Semifinished part 36 is then placed in a second die 43 ( Figure 6) also defined by two half-dies 44 and 46 of a drawing press (not shown).
  • Half-dies 44 and 46 have radial elements or ribs 47 and 48 similar to radial ribs 33 and 38 of half-dies 31 and 32, but such as to further draw radial undulations 34 and cavities 9 of semifinished part 36 to reduce the transverse dimension of blades 7.
  • radial ribs 47 and 48 are so shaped as to reduce the radius of walls 12 connecting walls 11, and so reduce the distance between walls 11, increase the angular extension of sector-shaped bottom walls 17, and increase the extension of cavities 9.
  • Semifinished part 36 is first placed on half-die 44 as shown in Figure 6; and die 43 is closed to subject semifinished part 36 to a second drawing operation and precisely form blades 7 of fan 6, so that the diameter of hole 42 of semifinished part 36 is further reduced to form hole 16 of fan 6.
  • the above method also provides for producing fan 20 in Figure 2, the only difference being that dies 30 and 43 have radial ribs 33,38 and 47,48 with, viewed from above, a curved as opposed to a straight profile.
  • die 43 may be used on its own. In which case, disk 28 is placed on half-die 44, and die 43 is closed to form blades 7 and cavities 9 in a single drawing operation.
  • Fan 6 produced using the above method may either be fitted directly to the supply system or subjected to a further fabrication step in which each blade 7 is bent further to bring respective lateral walls 11 closer together so that they are substantially contacting each other as shown in Figures 7 and 8.
  • number 60 in Figure 7 indicates a high-pressure straight-bladed single-intake fan
  • number 65 in Figure 8 a high-pressure curved-bladed single-intake fan, which are obtained respectively by bending blades 7 of fan 6 in Figure 1 and fan 20 in Figure 2.
  • Number 70 in Figure 9 indicates yet a further fan produced using the method according to the present invention.
  • Fan 70 is partly similar to fan 6 in Figure 1, except that it comprises a further number of radial undulations 72 defining a further number of blades 71 opposed with respect to blades 7.
  • blades 71 are identical to blades 7, extend radially with respect to axis 8 on the opposite side of the plane of bottom walls 17 to blades 7, and are offset angularly with respect to blades 7.
  • Blades 71 are formed by deforming respective mid portions of bottom walls 17 in exactly the same way as, but in the opposite direction to, blades 7.
  • Fan 70 of the above type is known technically as a "high-pressure straight-bladed double-intake" fan by having two identical intake sides, each identical to that of high-pressure straight-bladed single-intake fan 6 in Figure 1, so that the intake of fan 70 in Figure 9 is substantially twice that of fan 6 in Figure 1.
  • Fan 70 may also either be fitted directly to the supply system or subjected to a further fabrication step to bend blades 7, 71 and bring respective walls 11 closer together so that they are substantially contacting each other.
  • Figure 10 shows an air supply system fitted with fan 70 in Figure 9.
  • the supply system indicated as a whole by 80, comprises a fan 82 featuring a high-pressure straight-bladed double-intake fan 70 of the type described above and powered by a drive 83. More specifically, fan 82 comprises a first and second air intake 84, 85 on opposite sides of fan 70, and a single air outlet 86.
  • fans featuring double-intake fans 70 provide for drawing in substantially twice the volume of air, and hence for better conditioning performance, as compared with single-intake fans.
  • fan 6 is extremely cheap to produce, the overall cost reduction, with respect to known methods, being estimated at about 50%.
  • blades 7 have no sharp edges, and walls 11 of blades 7 7 are perfectly smooth with no welds or riveting, fan 6 is extremely silent-operating, and consumes at least 20% less electric power as compared with known fans of the same capacity.
  • surfaces 11 of blades 7 of fan 6 may be nonsymmetrical; and the fabrication method may be implemented by an automatic multistation device.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Claims (19)

  1. Verfahren zur Herstellung eines Metallblechventilators (6; 20), dadurch gekennzeichnet, daß es die Schritte umfaßt:
    Herstellen einer Metallblechscheibe (28) mit einem zentralen Loch (29), das zu einer Achse (8) koaxial ist; und
    Unterziehen der Scheibe (28) mindestens einem ersten Ziehvorgang, um einen welligen Körper (36, 6; 20) mit mindestens einer Anzahl von ersten Wellen (34) auszubilden, die eine Anzahl von ersten Flügeln (7) des Ventilators (6; 20) definieren.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der erste Ziehschritt erste Flügel (7), die sich axial verjüngen und jeweils ein Paar von einander zugewandten, zusammenlaufenden Seitenwänden (11) umfassen, und eine Verbindungswand (12), die die Seitenwände (11) verbindet, ausbildet.
  3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß die ersten Flügel (7) durch Verformen von Teilen der Scheibe (28) in derselben Richtung ausgebildet werden.
  4. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß es auch den Schritt umfaßt:
    Unterziehen des welligen Körpers (36) einem zweiten Ziehvorgang, um eine Querabmessung von jedem der ersten Flügel (7) zu verändern.
  5. Verfahren nach einem der vorangehenden Ansprüche 2 bis 4, dadurch gekennzeichnet, daß es auch den Schritt umfaßt:
    Biegen von jedem der ersten Flügel (7), um den Abstand zwischen den jeweiligen Seitenwänden (11) zu verringern.
  6. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, daß es auch den Schritt umfaßt:
    Unterziehen des welligen Körpers (36) einem dritten Ziehvorgang, um eine Anzahl von zweiten Wellen (72) auszubilden, die eine Anzahl von zweiten Flügeln (71) des Ventilators (70) definieren.
  7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß die zweiten Flügel (71) durch Verformen von Teilen (17) des welligen Körpers (36), die sich zwischen jeweiligen Paaren von benachbarten ersten Flügeln (7) befinden, in der entgegengesetzten Richtung zu jener, in der die ersten Flügel (7) verformt werden, ausgebildet werden.
  8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß es auch den Schritt umfaßt:
    Biegen der zweiten Flügel (71), um den Abstand zwischen den jeweiligen Seitenwänden (11) zu verringern.
  9. Metallblechventilator, dadurch gekennzeichnet, daß er aus einem Stück ausgeformt wird, und dadurch, daß er Wellen (34, 72), die mit Hohlräumen (9) abwechseln, umfaßt; wobei die Wellen (34, 72) mindestens eine Anzahl von ersten Flügeln (7) des Ventilators (6; 20) definieren.
  10. Ventilator nach Anspruch 9, dadurch gekennzeichnet, daß jeder der ersten Flügel (7) ein Paar von einander zugewandten, zusammenlaufenden Seitenwänden (11) und eine Verbindungswand (12), die die Seitenwände (11) verbindet, umfaßt.
  11. Ventilator nach Anspruch 10, dadurch gekennzeichnet, daß die Verbindungswand (12) einen ersten Teil (13) mit Erzeugungslinien, die zu einer Achse (8) des Ventilators (6; 20) im wesentlichen senkrecht sind, und einen zweiten Teil (14) mit Erzeugungslinien, die bezüglich der Achse (8) abfallen, umfaßt.
  12. Ventilator nach Anspruch 11, dadurch gekennzeichnet, daß die Vorsprünge der Erzeugungslinien in einer zur Achse (8) im wesentlichen senkrechten Ebene im wesentlichen gerade sind.
  13. Ventilator nach Anspruch 11, dadurch gekennzeichnet, daß die Vorsprünge der Erzeugungslinien in einer zur Achse (8) im wesentlichen senkrechten Ebene gekrümmt sind.
  14. Ventilator nach einem der vorangehenden Ansprüche 10 bis 13, dadurch gekennzeichnet, daß die Hohlräume (9) einen im wesentlichen trapezförmigen Umfangsabschnitt aufweisen.
  15. Ventilator nach Anspruch 14, dadurch gekennzeichnet, daß jeder der Hohlräume (9), gemessen entlang einer Umfangslinie, eine Abmessung aufweist, die größer ist als jeder der ersten Flügel (7), gemessen entlang derselben Umfangslinie.
  16. Ventilator nach Anspruch 14 oder 15, dadurch gekennzeichnet, daß jeder der Hohlräume (9) durch zwei Seitenwände (11) von winkelmäßig benachbarten ersten Flügeln (7) und durch eine ebene, im wesentlichen sektorförmige Bodenwand (17) definiert ist.
  17. Ventilator nach Anspruch 16, dadurch gekennzeichnet, daß die Bodenwände (17) koplanar sind und daß sich die ersten Flügel (7) auf derselben Seite der Ebene der Bodenwände (17) erstrecken.
  18. Ventilator nach Anspruch 16 oder 17, dadurch gekennzeichnet, daß die Wellen (34, 72) auch eine Anzahl von zweiten Flügeln (71) definieren, die bezüglich der ersten Flügel (7) entgegengesetzt liegen.
  19. Ventilator nach Anspruch 18, dadurch gekennzeichnet, daß die zweiten Flügel (71) in einem Winkel bezüglich der ersten Flügel (7) versetzt sind und sich von mittleren Bereichen von jeweiligen Bodenwänden (17) erstrecken.
EP98101839A 1997-02-04 1998-02-03 Verfahren zum Herstellen eines Metallblechventilators und so hergestellter Ventilator Expired - Lifetime EP0857528B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO970082 1997-02-04
IT97TO000082A IT1291493B1 (it) 1997-02-04 1997-02-04 Metodo di fabbricazione di una ventola in lamiera e relativa ventola cosi' fabbricata

Publications (3)

Publication Number Publication Date
EP0857528A2 EP0857528A2 (de) 1998-08-12
EP0857528A3 EP0857528A3 (de) 1999-06-23
EP0857528B1 true EP0857528B1 (de) 2002-12-11

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EP98101839A Expired - Lifetime EP0857528B1 (de) 1997-02-04 1998-02-03 Verfahren zum Herstellen eines Metallblechventilators und so hergestellter Ventilator

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EP (1) EP0857528B1 (de)
AT (1) ATE229389T1 (de)
DE (1) DE69809972T2 (de)
DK (1) DK0857528T3 (de)
ES (1) ES2186024T3 (de)
IT (1) IT1291493B1 (de)
PT (1) PT857528E (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6712584B2 (en) 2000-04-21 2004-03-30 Revcor, Inc. Fan blade
US6814545B2 (en) 2000-04-21 2004-11-09 Revcor, Inc. Fan blade
US6942457B2 (en) 2002-11-27 2005-09-13 Revcor, Inc. Fan assembly and method
JP7041866B2 (ja) * 2016-07-13 2022-03-25 株式会社荏原製作所 ボルテックス形ポンプ用羽根車及びボルテックス形ポンプ

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3095822A (en) * 1960-04-01 1963-07-02 Kiefer Otto Plastic wheels or runners
US3845903A (en) * 1973-08-15 1974-11-05 Dunham Bush Inc One piece radial vane diffuser and method of manufacturing the same
US5554004A (en) * 1995-07-27 1996-09-10 Ametek, Inc. Fan impeller assembly

Also Published As

Publication number Publication date
ES2186024T3 (es) 2003-05-01
ITTO970082A1 (it) 1998-08-04
DK0857528T3 (da) 2003-03-24
PT857528E (pt) 2003-04-30
IT1291493B1 (it) 1999-01-11
EP0857528A2 (de) 1998-08-12
EP0857528A3 (de) 1999-06-23
DE69809972T2 (de) 2003-07-17
DE69809972D1 (de) 2003-01-23
ATE229389T1 (de) 2002-12-15

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