EP1621775A2 - A composite fan rotor for a tangential fan - Google Patents
A composite fan rotor for a tangential fan Download PDFInfo
- Publication number
- EP1621775A2 EP1621775A2 EP05106204A EP05106204A EP1621775A2 EP 1621775 A2 EP1621775 A2 EP 1621775A2 EP 05106204 A EP05106204 A EP 05106204A EP 05106204 A EP05106204 A EP 05106204A EP 1621775 A2 EP1621775 A2 EP 1621775A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- fan
- fan rotor
- blades
- transverse
- rotor
- 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.)
- Withdrawn
Links
Images
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
- F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
- F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers
- F04D29/282—Rotors 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
- F04D29/283—Rotors 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 rotors of the squirrel-cage type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D17/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps
- F04D17/02—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal
- F04D17/04—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal pumps having non-centrifugal stages, e.g. centripetal of transverse-flow type
-
- 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
- F04D29/02—Selection of particular materials
- F04D29/023—Selection of particular materials especially adapted for elastic fluid pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/10—Metals, alloys or intermetallic compounds
- F05D2300/12—Light metals
- F05D2300/121—Aluminium
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/40—Organic materials
- F05D2300/43—Synthetic polymers, e.g. plastics; Rubber
Definitions
- the present invention relates to a fan rotor, in particular for a tangential fan, comprising:
- Tangential fans are used in particular in air conditioning systems and for ventilating ovens.
- fan rotors for such fans have a cylindrical cage structure with at least two end discs and, frequently, intermediate discs too, with preferably arcuate blades extending longitudinally between them.
- Such fan rotors are generally made of metal. More recently, fan rotors of plastics material have been available.
- Fan rotors made completely of metal are typically made of pressed sheet metal, while plastics fan rotors are generally manufactured by injection moulding.
- Fan rotors made of a metal offer good reliability even at high temperatures, but are limited as to the possible shape of the blades.
- the thickness of blades produced from sheet metal is essentially constant, so it is not possible to make blades with a more aerodynamically effective cross section, for example blades which have a wing profile.
- Plastics blades on the other hand, can be moulded into a variety of shapes and thicknesses and can, in particular, be given a wing profile which offers high performance and low noise levels of the fan.
- thermoplastic material used is subject to high temperatures in operation, at which the rotor can become deformed, with its structure being at risk of undergoing physical, chemical and dimensional alterations which can reduce its reliability.
- a second disadvantage lies in the fact that the process for moulding a cage-structure fan rotor is highly complicated, with regard to dimensions and to the design of the moulds and with regard to the ease with which a fan can be extracted from the mould, this last being the reason why blades are often manufactured so as to project radially beyond one of the terminal discs. These radially projecting blades make the fan noisier in operation.
- a third disadvantage is related to the mounting of elastomeric hubs on the longitudinal ends of the fan rotor. These hubs are generally either co-moulded with the terminal portions of the fan rotor or inserted into the said terminal portions and such operations can give rise to problems.
- One object of the invention is to overcome these disadvantages of the prior art and to provide a fan rotor of the type described above, which is reliable at high temperatures, has a structure which is both simple and compact and is characterised by low operating noise, is simple and economical to manufacture and offers a high operating efficiency.
- the fan rotor provides enhanced reliability and improved performance.
- a fan rotor of this type is easier to produce since only the blades are injection-moulded, thereby eliminating the need to form the entire cage structure in a single mould, with the blades then being fitted to the transverse portions using the same method and machinery used to assemble fan rotors made entirely of metal.
- the blades do not need to project radially from the terminal support elements of the fan rotor, providing the considerable advantage of reducing fan noise.
- a tangential fan of a type which is known per se is generally indicated 1, having a support structure or shroud 2 also for conveying air and made of sheet metal or a plastics material.
- a fan rotor 10 is mounted for rotation in the structure 2, rotatable by means of an electric motor 3, preferably an alternating current electric motor, for example a screened pole asynchronous motor.
- an electric motor 3 preferably an alternating current electric motor, for example a screened pole asynchronous motor.
- the structure 2 includes two facing end walls 4, 5 and at least one side wall 9 extending about the axis of the fan rotor 10, between the said end walls.
- Two supports, indicated 6, are provided for the rotation of the fan rotor 10, which in operation rotates about an axis indicated A.
- the fan rotor 10 has a cage-like structure, generally cylindrical in shape, with two transverse elements or discs 12 and an intermediate transverse disc element 14 with a circumferential arrangement of blades 16 around it, all preferably arcuate in section.
- a plurality of intermediate discs it is possible to use a plurality of intermediate discs.
- FIG 2 shows a perspective view of the fan rotor 10 with the blades 16 fitted onto the transverse elements 12, 14. These latter are made of metal, have notches 18 in their perimeter (see Figure 3), and are usually produced by pressing.
- the blades 16 are produced, for example, by injection moulding of a thermoplastic material and are coupled to the transverse elements 12, 14 at the notches 18. These latter are preferably of a complementary arcuate configuration able to house and retain corresponding portions of the blades 16, by means of interference fit coupling, for example.
- plastic blades 16 it is advantageous for the plastic blades 16 to be made with an optimised fluid-dynamic section, of a wing profile, for example.
- portions 22 of each blade 16 intended to be inserted into corresponding grooves 18 in the transverse terminal elements 12 (and in any intermediate transverse element or elements 14) can have a modified section, in particular thinner, with respect to the rest of the blade, in order to facilitate this insertion operation.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
Abstract
two transverse terminal elements (12), substantially perpendicular to the axis of rotation of the rotor;
a plurality of longitudinal blades (16) arranged circumferentially about the axis of rotation of the fan rotor, parallel both to each other and to the axis, and which extend longitudinally between the transverse terminal elements (12); and in which
the transverse terminal elements (12) are made of metal and the blades (16) are moulded of a plastics material and fixed to the periphery of the transverse terminal elements (12).
Description
- The present invention relates to a fan rotor, in particular for a tangential fan, comprising:
- two terminal transverse support elements, substantially perpendicular to the axis of rotation of the rotor; and
a plurality of longitudinal blades disposed circumferentially about the axis of rotation of the fan rotor, parallel to each other and to the said axis, and extending longitudinally between the terminal transverse support elements. - Tangential fans are used in particular in air conditioning systems and for ventilating ovens. In the prior art, fan rotors for such fans have a cylindrical cage structure with at least two end discs and, frequently, intermediate discs too, with preferably arcuate blades extending longitudinally between them.
- Such fan rotors are generally made of metal. More recently, fan rotors of plastics material have been available.
- Fan rotors made completely of metal are typically made of pressed sheet metal, while plastics fan rotors are generally manufactured by injection moulding.
- Fan rotors made of a metal offer good reliability even at high temperatures, but are limited as to the possible shape of the blades. In particular, the thickness of blades produced from sheet metal is essentially constant, so it is not possible to make blades with a more aerodynamically effective cross section, for example blades which have a wing profile. Plastics blades, on the other hand, can be moulded into a variety of shapes and thicknesses and can, in particular, be given a wing profile which offers high performance and low noise levels of the fan.
- However, tangential fan rotors made entirely of plastics materials also carry some disadvantages.
- A first disadvantage lies in the fact that the thermoplastic material used is subject to high temperatures in operation, at which the rotor can become deformed, with its structure being at risk of undergoing physical, chemical and dimensional alterations which can reduce its reliability.
- A second disadvantage lies in the fact that the process for moulding a cage-structure fan rotor is highly complicated, with regard to dimensions and to the design of the moulds and with regard to the ease with which a fan can be extracted from the mould, this last being the reason why blades are often manufactured so as to project radially beyond one of the terminal discs. These radially projecting blades make the fan noisier in operation.
- A third disadvantage is related to the mounting of elastomeric hubs on the longitudinal ends of the fan rotor. These hubs are generally either co-moulded with the terminal portions of the fan rotor or inserted into the said terminal portions and such operations can give rise to problems.
- One object of the invention is to overcome these disadvantages of the prior art and to provide a fan rotor of the type described above, which is reliable at high temperatures, has a structure which is both simple and compact and is characterised by low operating noise, is simple and economical to manufacture and offers a high operating efficiency.
- This object is achieved according to the invention by providing a fan rotor of the type specified, in which the terminal transverse elements are made of metal and the blades are made of moulded plastics material and are secured to the periphery of the said terminal transverse elements.
- Thanks to these characteristics, the fan rotor provides enhanced reliability and improved performance. A fan rotor of this type is easier to produce since only the blades are injection-moulded, thereby eliminating the need to form the entire cage structure in a single mould, with the blades then being fitted to the transverse portions using the same method and machinery used to assemble fan rotors made entirely of metal. Finally, the blades do not need to project radially from the terminal support elements of the fan rotor, providing the considerable advantage of reducing fan noise.
- Further characteristics of the invention will become apparent from the detailed description which follows, with reference to the drawings provided purely by way of non-limitative example, in which:
- Figure 1 is a plan view of a tangential fan including a fan rotor according to the invention;
- Figure 2 is a perspective view of a fan rotor according to the invention;
- Figure 3 is a view of a transverse element of a fan rotor according to the invention; and
- Figure 4 is a perspective view of a blade usable in a fan rotor according to the invention.
- In Figure 1, a tangential fan of a type which is known per se is generally indicated 1, having a support structure or shroud 2 also for conveying air and made of sheet metal or a plastics material.
- A fan rotor 10 is mounted for rotation in the structure 2, rotatable by means of an
electric motor 3, preferably an alternating current electric motor, for example a screened pole asynchronous motor. - In the embodiment shown by way of example in Figure 1, the structure 2 includes two facing
end walls 4, 5 and at least oneside wall 9 extending about the axis of the fan rotor 10, between the said end walls. Two supports, indicated 6, are provided for the rotation of the fan rotor 10, which in operation rotates about an axis indicated A. - In the embodiment illustrated by way of example, the fan rotor 10 has a cage-like structure, generally cylindrical in shape, with two transverse elements or
discs 12 and an intermediatetransverse disc element 14 with a circumferential arrangement ofblades 16 around it, all preferably arcuate in section. For especially long fans, it is possible to use a plurality of intermediate discs. - Figure 2 shows a perspective view of the fan rotor 10 with the
blades 16 fitted onto thetransverse elements notches 18 in their perimeter (see Figure 3), and are usually produced by pressing. Thetransverse terminal elements 12, which can also be made of aluminium, carry rotary supports 6 (see Figure 1) of a polymeric material, for example, which can either be moulded onto the saidtransverse terminal elements 12, or manufactured separately and then secured (by interference fit, for example) onto the terminaltransverse elements 12. - With reference in particular to Figure 4, the
blades 16 are produced, for example, by injection moulding of a thermoplastic material and are coupled to thetransverse elements notches 18. These latter are preferably of a complementary arcuate configuration able to house and retain corresponding portions of theblades 16, by means of interference fit coupling, for example. - It is advantageous for the
plastic blades 16 to be made with an optimised fluid-dynamic section, of a wing profile, for example. In this event,portions 22 of eachblade 16 intended to be inserted intocorresponding grooves 18 in the transverse terminal elements 12 (and in any intermediate transverse element or elements 14) can have a modified section, in particular thinner, with respect to the rest of the blade, in order to facilitate this insertion operation. - The manufacture of only the blades of a plastics material also makes it possible to use blades which need not be straight, but could be curved in various ways in order to improve performance, a possibility which is not available when an entire fan rotor is moulded in a plastics material.
- Naturally, the principle of the invention remaining unchanged, manufacturing details and embodiments may vary widely from those described and illustrated, without departing thereby from the scope of the present invention.
Claims (7)
- A fan rotor (10), in particular for a fan of tangential type (1), including:two transverse terminal support elements (12) substantially perpendicular to the axis of rotation (A) of the fan rotor (10);a plurality of longitudinal blades (16) arranged circumferentially about the axis of rotation (A) of the fan rotor (10), parallel to each other and to the said axis (A) and extending longitudinally between the terminal transverse support elements (12); and in whichthe transverse terminal elements (12) are made of metal while the blades (16) are moulded in a plastics material and are fixed to the periphery of the said transverse terminal elements (12).
- A fan rotor (10) according to Claim 1, in which the blades (16) are fitted in peripheral grooves (18) formed at the outer perimeter of the transverse terminal elements (12).
- A fan rotor (10) according to Claim 1 or Claim 2, further comprising at least one intermediate transverse support element (14), also made of metal and into which the blades (16) are also fixed; the said intermediate element (14) being substantially perpendicular to the axis of rotation (A).
- A fan rotor (10) according to any of the preceding Claims, in which the blades (16) are not of constant thickness in cross section, having a cross section which is like a wing section.
- A fan rotor (10) according to any preceding Claim, in which the cross section of the blades (16) is modified at the portions (22) intended to be coupled to the transverse support elements (12, 14).
- A fan rotor (10) according to any preceding Claim, in which the transverse support elements (12, 14) are made of aluminium.
- A fan (1) including a fan rotor (10) according to any of the preceding Claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT000542A ITTO20040542A1 (en) | 2004-07-30 | 2004-07-30 | COMPOSITE FAN FOR A TANGENTIAL TYPE FAN |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1621775A2 true EP1621775A2 (en) | 2006-02-01 |
EP1621775A3 EP1621775A3 (en) | 2009-10-21 |
Family
ID=35266890
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05106204A Withdrawn EP1621775A3 (en) | 2004-07-30 | 2005-07-07 | A composite fan rotor for a tangential fan |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1621775A3 (en) |
CN (1) | CN1734100A (en) |
IT (1) | ITTO20040542A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103352869A (en) * | 2013-04-15 | 2013-10-16 | 温州市亨成电子有限公司 | Aluminium one-step forming cross-flow and eddy-current wind wheel and processing technology thereof |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101832294B (en) * | 2010-05-21 | 2013-04-17 | 余姚天超通风设备有限公司 | Manufacturing method of inclined through-flow metal fan blade |
CN110107957B (en) * | 2015-10-12 | 2020-12-11 | 珠海格力电器股份有限公司 | Air conditioner indoor unit and air conditioner |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3536416A (en) * | 1968-05-14 | 1970-10-27 | Dov Z Glucksman | Squirrel-cage rotor for fluid moving devices |
JPS55148998A (en) * | 1979-05-10 | 1980-11-19 | Mineichi Akaishi | Multiple blade fan |
US5476365A (en) * | 1993-09-28 | 1995-12-19 | Kobayashi; Takao | Centrifugal blower wheel with forward curved multi-blades |
-
2004
- 2004-07-30 IT IT000542A patent/ITTO20040542A1/en unknown
-
2005
- 2005-07-07 EP EP05106204A patent/EP1621775A3/en not_active Withdrawn
- 2005-07-29 CN CNA2005100881749A patent/CN1734100A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3536416A (en) * | 1968-05-14 | 1970-10-27 | Dov Z Glucksman | Squirrel-cage rotor for fluid moving devices |
JPS55148998A (en) * | 1979-05-10 | 1980-11-19 | Mineichi Akaishi | Multiple blade fan |
US5476365A (en) * | 1993-09-28 | 1995-12-19 | Kobayashi; Takao | Centrifugal blower wheel with forward curved multi-blades |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103352869A (en) * | 2013-04-15 | 2013-10-16 | 温州市亨成电子有限公司 | Aluminium one-step forming cross-flow and eddy-current wind wheel and processing technology thereof |
CN103352869B (en) * | 2013-04-15 | 2015-11-25 | 温州市亨成电子有限公司 | Aluminum once-through cross-flow type wind wheel, vortex type wind wheel and processing technology thereof |
Also Published As
Publication number | Publication date |
---|---|
EP1621775A3 (en) | 2009-10-21 |
CN1734100A (en) | 2006-02-15 |
ITTO20040542A1 (en) | 2004-10-30 |
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Effective date: 20100422 |