EP0992692B1 - Fan including a duct for cooling the motor - Google Patents
Fan including a duct for cooling the motor Download PDFInfo
- Publication number
- EP0992692B1 EP0992692B1 EP99119896A EP99119896A EP0992692B1 EP 0992692 B1 EP0992692 B1 EP 0992692B1 EP 99119896 A EP99119896 A EP 99119896A EP 99119896 A EP99119896 A EP 99119896A EP 0992692 B1 EP0992692 B1 EP 0992692B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- motorized fan
- duct
- motor
- fan
- 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.)
- Expired - Lifetime
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
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
- F04D25/082—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation the unit having provision for cooling the motor
-
- 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
- F04D29/58—Cooling; Heating; Diminishing heat transfer
- F04D29/5806—Cooling the drive system
Definitions
- the present invention relates to a duct for a motorized fan, for application in particular to a heat exchanger for an internal combustion engine e.g. US-A-5 180 279.
- the invention relates to a duct comprising an essentially annular outer wall, defining internally an axial flow passage and which surrounds, in use, the rotor of the motorized fan; downstream of the motorized fan, the said wall is connected by means of a plurality of spokes to a central support structure to which the motor of the fan is fixed.
- the object of the present invention is to provide a duct of the aforesaid type which enables the electric motor of the fan to be efficiently cooled.
- a duct of the type described above characterised in that at least one blade is shaped so as to define a conduit with a radially outer inlet aperture, operable to capture a portion of the air stream generated by the fan in operation, and a radially inner outlet aperture, opening to the region occupied by the motor of the motorized fan.
- the invention also relates to a cooling device which includes a motorized fan and a duct having the characteristics defined above.
- a cooling device is generally indicated 1, for application in particular to a heat exchanger, such as a radiator, of an internal combustion engine.
- the cooling device 1 includes a motorized fan, generally indicated 2, and an associated duct, indicated 3.
- the motorized fan 2 includes, in a manner known per se, a rotor 4 with a hub 5 having a plurality of blades 6 extending from the periphery thereof.
- a rotor 4 with a hub 5 having a plurality of blades 6 extending from the periphery thereof.
- the radially outer ends of the blades 6 of the rotor 4 are connected to an outer ring indicated 7.
- the hub 5 of the rotor 4 is hollow and the associated electric drive motor 8 lies at least partially within it.
- the shaft 9 of the electric motor 8 is operatively connected to the hub 5 of the rotor.
- the duct 3 comprises an essentially annular outer wall 10 which defines internally an axial flow passage 11 and surrounds the rotor 4 of the motorized fan.
- the wall 10 of the duct Downstream of the motorized fan 2, the wall 10 of the duct is connected by means of a plurality of spokes 12 to a central support structure 13 to which the housing of the electric motor 8 is fixed in a manner known per se.
- each spoke 12 of the duct 3 is shaped so as to define a conduit 14 having a radially outer inlet aperture 15, acting to capture a portion of the air stream generated by the operation of the motorized fan 2.
- the stream of air captured through the aperture 15 flows through the conduit 14 in the direction of a radially inner outlet aperture 16 directed towards the region occupied by the motor 8 of the motorized fan.
- a spoke or each of the spokes 12, has a substantially tubular structure.
- this spoke could simply have a channel-shape structure.
- a chamber 17 is formed in the vicinity of the central support structure 13, into which the conduit 14 formed in one or each spoke 12 of the duct opens.
- the outlet or discharge aperture 16 is most conveniently formed essentially in the wall of this chamber facing the electric motor 8.
- the cooling of the motor 8 of the motorized fan can be further improved by the provision of a plurality of blades 18 (Figure 1) which extend from the inner surface of the hub of the rotor, generating in operation a stream which washes over the outer surface of the motor 8.
Description
- The present invention relates to a duct for a motorized fan, for application in particular to a heat exchanger for an internal combustion engine e.g. US-A-5 180 279.
- More specifically, the invention relates to a duct comprising an essentially annular outer wall, defining internally an axial flow passage and which surrounds, in use, the rotor of the motorized fan; downstream of the motorized fan, the said wall is connected by means of a plurality of spokes to a central support structure to which the motor of the fan is fixed.
- The object of the present invention is to provide a duct of the aforesaid type which enables the electric motor of the fan to be efficiently cooled.
- This and other objects are achieved according to the invention by providing a duct of the type described above, characterised in that at least one blade is shaped so as to define a conduit with a radially outer inlet aperture, operable to capture a portion of the air stream generated by the fan in operation, and a radially inner outlet aperture, opening to the region occupied by the motor of the motorized fan.
- The invention also relates to a cooling device which includes a motorized fan and a duct having the characteristics defined above.
- Further characteristics and advantages of the invention will become apparent from the following detailed description, provided purely by way of non-limitative example, with reference to the appended drawings, in which:
- Figure 1 is a longitudinally sectioned partial view of a cooling assembly which includes a motorized fan and a duct according to the invention;
- Figure 2 is a rear view of the said cooling assembly, in the direction of the arrow II of Figure 1;
- Figure 3 is a sectioned partial view taken on the line III - III of Figure 2.
-
- In Figure 1, a cooling device is generally indicated 1, for application in particular to a heat exchanger, such as a radiator, of an internal combustion engine.
- The
cooling device 1 includes a motorized fan, generally indicated 2, and an associated duct, indicated 3. - The motorized
fan 2 includes, in a manner known per se, a rotor 4 with ahub 5 having a plurality of blades 6 extending from the periphery thereof. In the embodiment shown by way of (non-limitative) example, the radially outer ends of the blades 6 of the rotor 4 are connected to an outer ring indicated 7. - Preferably, though not necessarily, the
hub 5 of the rotor 4 is hollow and the associated electric drive motor 8 lies at least partially within it. - The
shaft 9 of the electric motor 8 is operatively connected to thehub 5 of the rotor. - The duct 3 comprises an essentially annular
outer wall 10 which defines internally anaxial flow passage 11 and surrounds the rotor 4 of the motorized fan. - Downstream of the
motorized fan 2, thewall 10 of the duct is connected by means of a plurality ofspokes 12 to acentral support structure 13 to which the housing of the electric motor 8 is fixed in a manner known per se. - As may be seen in Figure 3, it is convenient if at least one and preferably each spoke 12 of the duct 3 is shaped so as to define a
conduit 14 having a radiallyouter inlet aperture 15, acting to capture a portion of the air stream generated by the operation of themotorized fan 2. - The stream of air captured through the
aperture 15 flows through theconduit 14 in the direction of a radiallyinner outlet aperture 16 directed towards the region occupied by the motor 8 of the motorized fan. - In the embodiment illustrated by way of example in Figure 3, a spoke, or each of the
spokes 12, has a substantially tubular structure. On the other hand, this spoke could simply have a channel-shape structure. - In the embodiment illustrated, a
chamber 17 is formed in the vicinity of thecentral support structure 13, into which theconduit 14 formed in one or each spoke 12 of the duct opens. The outlet ordischarge aperture 16 is most conveniently formed essentially in the wall of this chamber facing the electric motor 8. - Thanks to the arrangement described above, a portion of the air stream generated by the motorized fan is conveyed through the spoke or spokes of the ducts in the direction of the electric motor 8 of the motorized fan, thus ensuring that the latter is efficiently cooled.
- The cooling of the motor 8 of the motorized fan can be further improved by the provision of a plurality of blades 18 (Figure 1) which extend from the inner surface of the hub of the rotor, generating in operation a stream which washes over the outer surface of the motor 8.
- Naturally, the principle of the invention remaining unchanged, the embodiments and manufacturing details thereof may be varied widely from those described and illustrated here by way of non-limitative example, without departing thereby from the scope of the invention, as claimed in the appended Claims.
Claims (5)
- A duct (3) for a motorized fan (2), in particular for application to a heat exchanger for an internal combustion engine; the duct (3) comprising an essentially annular outer wall (10), which defines internally an axial flow passage (11) and surrounds, in use, the rotor (4) of the motorized fan (2); downstream of the motorized fan (2), the said wall (10) being connected by means of a plurality of spokes (12) to a central support structure (13) to which the motor (8) of the motorized fan (2) is fixed;
the duct (3) being characterised in that at least one spoke (12) is shaped so as to define a conduit (14) with a radially outer inlet aperture (15), acting to capture a portion of the air stream generated in use by the motorized fan (2), and a radially inner outlet aperture (16), directed towards the region occupied by the motor (8) of the motorized fan (2). - A duct according to Claim 1, characterised in that the said at least one spoke (12) has a substantially tubular structure.
- A duct according to Claim 1 or Claim 2, characterised in that a chamber (17) is formed in the vicinity of the central support structure (13) with an outlet aperture (16) facing the region occupied by the motor (8) of the motorized fan (2), and in that the conduit (14) formed in the or each said spoke (12) opens into the said chamber (17).
- A cooling device (1), in particular for a heat exchanger of an internal combustion engine, which includes a motorized fan (2) and a duct (3) according to one or more of the preceding Claims.
- A cooling device according to Claim 4, in which the rotor (4) of the motorized fan (2) has a hollow hub (5) operatively coupled to the shaft (9) of the motor (8) of the motorized fan (2);
characterised in that a plurality of blades (18) extend from the inner surface of the hub (5) of the rotor (4) acting, in operation, to generate a stream of air which washes over the motor (8) of the motorized fan (2).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT1998TO000850A IT1303112B1 (en) | 1998-10-08 | 1998-10-08 | CONVEYOR FOR A MOTOR-FAN AND COOLING DEVICE INCLUDING SUCH CONVEYOR. |
ITTO980850 | 1998-10-08 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0992692A1 EP0992692A1 (en) | 2000-04-12 |
EP0992692B1 true EP0992692B1 (en) | 2004-11-17 |
Family
ID=11417094
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99119896A Expired - Lifetime EP0992692B1 (en) | 1998-10-08 | 1999-10-07 | Fan including a duct for cooling the motor |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0992692B1 (en) |
DE (1) | DE69921930T2 (en) |
IT (1) | IT1303112B1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004097226A1 (en) * | 2003-04-28 | 2004-11-11 | Robert Bosch Corporation | Automotive engine-cooling fan assembly |
ITBO20070380A1 (en) * | 2007-05-30 | 2008-11-30 | Spal Automotive Srl | VENTILATION UNIT |
PT2549116E (en) * | 2011-07-22 | 2013-10-24 | Ebm Papst Mulfingen Gmbh & Co | Axial ventilator with additional flow channel |
GB2495710A (en) * | 2011-10-17 | 2013-04-24 | Nidec Motors & Actuators Gmbh Germany | Motor support arm for a cooling system fan |
CN109441863B (en) * | 2018-12-26 | 2023-11-28 | 英飞同仁风机股份有限公司 | Roof centrifugal fan and motor cavity heat dissipation structure and method thereof |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1487766A (en) * | 1919-11-13 | 1924-03-25 | Ilg Electric Ventilating Compa | Protective device for ventilating fans |
US1466364A (en) * | 1921-08-04 | 1923-08-28 | Ilg Electric Ventilating Compa | Self-cooled electric motor |
GB2029125B (en) * | 1978-08-18 | 1983-01-12 | Smiths Industries Ltd | Electric-motor driven fan arrangement for use in engine cooling systems |
US5180279A (en) * | 1992-03-31 | 1993-01-19 | General Motors Corporation | Heat shield and deflector for engine cooling fan motor |
-
1998
- 1998-10-08 IT IT1998TO000850A patent/IT1303112B1/en active IP Right Grant
-
1999
- 1999-10-07 DE DE69921930T patent/DE69921930T2/en not_active Expired - Fee Related
- 1999-10-07 EP EP99119896A patent/EP0992692B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
IT1303112B1 (en) | 2000-10-30 |
EP0992692A1 (en) | 2000-04-12 |
DE69921930D1 (en) | 2004-12-23 |
ITTO980850A1 (en) | 2000-04-08 |
DE69921930T2 (en) | 2005-03-31 |
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