EP0894199B1 - Impeller - Google Patents

Impeller Download PDF

Info

Publication number
EP0894199B1
EP0894199B1 EP97921050A EP97921050A EP0894199B1 EP 0894199 B1 EP0894199 B1 EP 0894199B1 EP 97921050 A EP97921050 A EP 97921050A EP 97921050 A EP97921050 A EP 97921050A EP 0894199 B1 EP0894199 B1 EP 0894199B1
Authority
EP
European Patent Office
Prior art keywords
discs
blade
mountings
hub
impeller
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
EP97921050A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0894199A1 (en
Inventor
Edgar Säterdal
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.)
Flaekt Woods AB
Original Assignee
Flaekt Woods AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Flaekt Woods AB filed Critical Flaekt Woods AB
Publication of EP0894199A1 publication Critical patent/EP0894199A1/en
Application granted granted Critical
Publication of EP0894199B1 publication Critical patent/EP0894199B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/263—Rotors specially for elastic fluids mounting fan or blower rotors on shafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/34—Blade mountings
    • F04D29/36—Blade mountings adjustable

Definitions

  • the present invention relates to an axial impeller having a hub for attaching the impeller to a shaft and a plurality of essentially radial blades, which are each connected to the hub by means of a blade mounting and turnably attached to the respective blade mountings.
  • Normally used prior art axial impellers which are of this type and in which the blades are turnable for adjusting the capacity of the impeller, have a cast rim of the centre, which is accurately machined.
  • Each blade is turnably arranged on a substantially radial blade shaft, which is nonrotatably anchored in the rim of the centre, e.g. screwed into accurately machined holes in the rim.
  • the rim is connected to the shaft hub, which is cast, by means of components which are cast integrally with the hub and the rim.
  • the blade is formed with an integral shank and the hub comprises a metal body having a bore receiving the shank and tensioning means connects the shank and the body for applying tensile force to the shank, the blade and its shank being integrally formed of a fiber-reinforced synthetic resin material.
  • the blade is connected to a flange on the metal body by means of bolts or screws.
  • the construction of the invention permits the manufacture of the assembly to be advantageously simplified and the weight to be reduced while providing a consistently high rate of force transfer.
  • an impeller for an axial flow fan comprises a hub and two ring-shaped carrier elements, preferably made of a polymer material.
  • the carrier elements a plurality of indentations are made for the attachment of radially orientated fan blades.
  • the object of the invention is to make it possible to use the same ring-shaped elements for different number of blades and different lengths of the blades.
  • the object of the present invention is to provide an axial impeller, which is simple and inexpensive to manufacture and is of simple design, which does not require the stock-keeping of a plurality of expensive components, which are individually adapted to a number of impeller variants, e.g. impellers having different diameters and/or different numbers of blades.
  • an axial impeller which is of the type stated by way of introduction and which is characterised in that the hub supports two parallel discs which are arranged in front of each other, have essentially the same diameter and are provided with through bolt holes, that the blade mountings are arranged between the discs, and that the discs are attached to the blade mountings and pressed against these by means of bolts, which extend through bolt holes in the respective discs.
  • the bolt holes in the one disc are positioned in front of the bolt holes in the other disc, and the bolts extend through through bolt holes in the respective blade mountings.
  • the bolt holes in each disc are suitably arranged in pairs, one of the bolt holes in all pairs being positioned on an outer circle which is concentric with the disc and the other of these bolt holes being positioned on an inner circle which is concentric with the disc, and each blade mounting has two through bolt holes, which are located in front of the bolt holes in a pair of bolt holes in each disc.
  • the discs are preferably made of metal sheet.
  • a circumferential border surrounding the two discs and having through holes for the blades is attached to the discs to produce a flow which is aerodynamically undisturbed by the blade mountings.
  • the border suitably has internal disc mountings, which are uniformly distributed along the circumference of the border and have pins, which are inserted into pin holes formed in the discs in the vicinity of the circumference thereof.
  • the disc mountings are advantageously yieldable in a limitedly elastic manner in the radial direction of the discs.
  • the border is preferably made of metal sheet.
  • the axial impeller shown in the drawings has a hub 1 for attaching the impeller to a shaft (not shown).
  • the hub 1 has an axial centre hole 2 and a keyway 3 formed therein.
  • the hub 1 supports a plurality of essentially radial blades 4, of which only one is shown in Figs 2 and 6.
  • the hub 1 supports two discs 5 which are arranged in front of each other and are made of metal sheet, preferably cor-ten metal sheet.
  • the two discs 5 are concentric with the hub 1 and perpendicular to the axis thereof.
  • Each disc 5 has a centre hole 6, which has a smaller diameter than the hub 1 but a greater diameter than the centre hole 2 thereof, and a plurality of bolt holes 7, which are positioned in the vicinity of the centre hole 6 and are uniformly distributed around this.
  • Each disc 5 is attached to the hub 1 by means of bolts 8, which extend through the holes 7 and are screwed into corresponding threaded holes 9 in the hub 1 (Fig. 3).
  • Each disc 5 has two series of through bolt holes 10 and 11, the bolt holes 10 in one series being positioned on and uniformly distributed along an outer circle C1, which is concentric with the disc 5, and the bolt holes 11 in the other series being positioned on and uniformly distributed along an inner circle C2, which is concentric with the disc 5.
  • the bolt holes 10 and 11 are positioned radially in front of each other and form pairs of holes 10, 11.
  • the number of pairs of holes 10, 11 is identical with the number of blades 4.
  • Each blade 4 is, in a manner that will be described in more detail below, attached to a cast blade mounting 12, which is arranged between the discs 5.
  • Each blade mounting 12 has a main part 13 and a pivot pin 14 integrally cast therewith.
  • the main part 13 has two parallel through bolt holes 15 and 16, each positioned axially in front of a bolt hole 10, 11 in a pair of holes 10, 11 in each disc 5.
  • the discs 5 are attached to the blade mountings 12 and pressed against the main part 13 thereof by means of bolts 17 and 18, which extend through the holes 10, 11 in the discs 5 and the holes 15, 16 in the blade mountings 12.
  • a ring 19 consisting of two ring halves which are interconnected by means of bolts 20 (Fig. 4).
  • the ring 19 has an internal circumferential shoulder 21 engaging in a circumferential groove 22 in the pivot pin 14 of the blade mounting 12, and is turnable about the pivot pin 14 for adjustment of the blade 4.
  • the outer surface of the ring 19 is positioned at the same level as the free end surface of the pivot pin 14.
  • the ring 19 has four threaded bolt holes 23, which extend in the axial direction of the pivot pin 14 and which are uniformly distributed along the circumference of the ring 19.
  • Each blade 4 has a blade base 24 in the form of a disc, which abuts against the outer surface of the ring 19 and the end surface of the pivot pin 14.
  • An annular groove 25 is formed in the end surface of the pivot pin 14 and receives a cup spring 26, against which the blade base 24 abuts in the area of the groove 25.
  • the blade 4 is attached to the blade mounting 12 with the aid of four bolts 27, which each extend through a hole 28 in the blade base 24 and are each screwed into one of the bolt holes 23 in the ring 19 so as to press the base 24 of the blade 4 against the blade mounting 12.
  • the ring 19 is turnable for adjusting the blade 4 merely when the bolts 27 are not tightened.
  • the border 30 has in front of each blade mounting 12 a through hole 31 for each blade 4.
  • the width of the border 30 is greater than the distance between the discs 5.
  • the border 30 has a plurality of internal disc mountings 32 in the form of radially inwardly directed flanges, which are welded to the border and which are uniformly distributed along the circumference thereof.
  • Each mounting 32 has axially directed pins 33, which are inserted in a pin hole 34 (Fig. 5) in the associated disc 5.
  • the pin holes 34 are formed in the discs 5 in the vicinity of the circumference thereof.
  • the disc mountings 32 are provided with axially directed notches 35 (Fig. 3) which enable radial relative motions, which arise between the border 30 and the discs 5 during operation of the impeller, to be received in an elastically yieldable manner.
  • identical blade mountings 12 can be used independently of the number of blades 4 in the impeller. Blade mountings of different types and dimensions thus need not be kept in stock.
  • the discs 5 and the border 30 it is sufficient to keep metal sheets in stock since the machining of a metal sheet for manufacturing discs and border can be effected very easily and quickly once the diameter of the discs and the number of blades have been determined. The machining is suitably carried out as laser cutting.
  • the discs 5 and the border 30 need not be made of cor-ten metal sheet or any other metal sheet, but can be manufactured from, for instance, plastic material.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Saccharide Compounds (AREA)
  • Wind Motors (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP97921050A 1996-04-26 1997-04-23 Impeller Expired - Lifetime EP0894199B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9601589A SE508695C2 (sv) 1996-04-26 1996-04-26 Axialfläkthjul
SE9601589 1996-04-26
PCT/SE1997/000683 WO1997041355A1 (en) 1996-04-26 1997-04-23 Impeller

Publications (2)

Publication Number Publication Date
EP0894199A1 EP0894199A1 (en) 1999-02-03
EP0894199B1 true EP0894199B1 (en) 2003-06-25

Family

ID=20402349

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97921050A Expired - Lifetime EP0894199B1 (en) 1996-04-26 1997-04-23 Impeller

Country Status (17)

Country Link
EP (1) EP0894199B1 (et)
AT (1) ATE243812T1 (et)
AU (1) AU2719897A (et)
BG (1) BG62900B1 (et)
CZ (1) CZ287283B6 (et)
DE (1) DE69723065T2 (et)
DK (1) DK0894199T3 (et)
EE (1) EE03625B1 (et)
ES (1) ES2202610T3 (et)
HU (1) HUP9901664A3 (et)
NO (1) NO984955L (et)
PL (1) PL182685B1 (et)
RU (1) RU2184275C2 (et)
SE (1) SE508695C2 (et)
SK (1) SK282927B6 (et)
TR (1) TR199802138T2 (et)
WO (1) WO1997041355A1 (et)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2156818B1 (es) * 1999-05-07 2002-03-01 Soler & Palau Helices con numero variable de alabes de diferente inclinacion.
US7214035B2 (en) 2005-02-18 2007-05-08 Mario Bussières Rotor for a turbomachine
US8651816B2 (en) 2007-03-06 2014-02-18 Fantech Tecnologia Em Sistemas De Ventilacao Ltda Fan blade connection
US9863250B2 (en) * 2010-02-24 2018-01-09 United Technologies Corporation Fastener aperture having an elongated geometry
DE102014009051A1 (de) * 2014-06-24 2015-12-24 Tlt-Turbo Gmbh Laufrad für Axiallüfter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2610921A1 (de) * 1976-03-16 1977-09-22 Albert Zinth Fluegelrad fuer ventilatoren
DE3718678A1 (de) * 1987-06-04 1988-12-22 Mtu Muenchen Gmbh Fasertechnische verdichterschaufel

Also Published As

Publication number Publication date
SK144098A3 (en) 1999-12-10
DE69723065T2 (de) 2004-05-06
NO984955D0 (no) 1998-10-23
SE9601589D0 (sv) 1996-04-26
CZ335298A3 (cs) 1999-11-17
EE03625B1 (et) 2002-02-15
CZ287283B6 (en) 2000-10-11
TR199802138T2 (xx) 1999-02-22
BG102835A (en) 1999-04-30
AU2719897A (en) 1997-11-19
HUP9901664A3 (en) 2000-02-28
EE9800358A (et) 1999-04-15
PL329515A1 (en) 1999-03-29
SE9601589L (sv) 1997-10-27
NO984955L (no) 1998-12-22
BG62900B1 (bg) 2000-10-31
HUP9901664A2 (hu) 1999-08-30
SK282927B6 (sk) 2003-01-09
DE69723065D1 (de) 2003-07-31
RU2184275C2 (ru) 2002-06-27
ATE243812T1 (de) 2003-07-15
EP0894199A1 (en) 1999-02-03
DK0894199T3 (da) 2003-10-13
ES2202610T3 (es) 2004-04-01
PL182685B1 (pl) 2002-02-28
SE508695C2 (sv) 1998-10-26
WO1997041355A1 (en) 1997-11-06

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