GB2029125A - Electric-motor driven fan arrangements for use in engine cooling systems - Google Patents
Electric-motor driven fan arrangements for use in engine cooling systems Download PDFInfo
- Publication number
- GB2029125A GB2029125A GB7928644A GB7928644A GB2029125A GB 2029125 A GB2029125 A GB 2029125A GB 7928644 A GB7928644 A GB 7928644A GB 7928644 A GB7928644 A GB 7928644A GB 2029125 A GB2029125 A GB 2029125A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electric
- motor
- fan
- motor driven
- driven fan
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
- H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
- H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft
-
- 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
-
- 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
- F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
An electric-motor driven fan arrangement for drawing air over a radiator (11) of an engine cooling system comprises an electric-motor (12), an axial fan (13) rotatably driven by the motor (12), and a pipe (43) extending from adjacent the blades (26) of the fan to the motor housing (19) through which some of the flow of air produced by the fan blades is channelled to cool the interior of the motor housing (19). Air exits from the housing (19) through apertures (22) in one end thereof. The entrance to the pipe (43) may be through an aperture in a leg (32) of a shroud (30) surrounding the fan blades to which the motor is attached. <IMAGE>
Description
SPECIFICATION
Electric-motor driven fan arrangements for use in engine cooling systems
This invention relates to electric-motor driven fan arrangements and in particular to electricmotor driven fan arrangements for use in engine cooling systems of the kind having a radiator through which liquid coolant is passed, and for producing a flow of air over the radiator to cool the liquid coolant.
Electric-motor driven fan arrangements are commonly used in vehicles having a liquidcooled internal combustion engine to force or draw air over the fins of a radiator of the engine cooling system to cool the liquid coolant contained therein. Such fan arrangements are normally disposed under the bonnet of the vehicle adjacent the radiator of the cooling system and as a consequence are subjected to high ambient temperatures, particularly when the fan arrangement is located downstream of the radiator so that hot air from the radiator is drawn over the fan arrangement.
The size of the electric motor of the fan arrangement is dictated to a certain extent by the limited space available and, in order to achieve optimum performance from the fan arrangement, it is necessary that the electric motor operates to provide a high power output. As a result of such operation however, the electric motor may generate considerable internal heat, which, together with the high ambient temperatures experienced by the fan arrangement, may lead to overheating of the components of the electric motor. This overheating of the motor components may ultimately cause the motor to break down, or at the least will considerably shorten the life of the motor.
It is an object of the present invention to provide an electric-motor driven fan arrangement for use in an engine cooling system of the aforementioned kind, which is more readily capable of operating satisfactorily over long periods of time in such an environment.
According to a first aspect of the present invention there is provided an electric-motor driven fan arrangement for use in an engine cooling system of the kind having a radiator through which liquid coolant is passed, and which is to be disposed adjacent a said radiator for producing a flow of air over said radiator to cool the liquid coolant therein, comprising an electric motor which includes a housing and an output shaft extending through said housing, a fan coupled to the output shaft for producing a flow of air upon rotation of said output shaft, and means for channelling some of the air flow produced by said fan into said motor housing thereby to effect cooling of the interior of said motor housing.
The channelling means may comprise a pipe which opens at one end into the motor housing.
Preferably, the fan comprises an axial fan, in which case the other end of the pipe may open adjacent the path of the blades of the fan and may be arranged to face into the flow of air produced thereby. This other end of the pipe may be downstream of the fan blades.
The axial fan may include a hub portion which overlies one end of the motor housing, and an aperture may be provided in that end of the motor housing through which air exits.
Shroud means may be provided which extends around, and is spaced from the fan blades to define a duct for the flow of air. A member may extend from the shroud means into the path of the flow of air produced by the fan and the end of the pipe may open through an aperture in this member.
According to a second aspect of the present invention, there is provided an engine cooling system including an electric-motor driven fan arrangement in accordance with the first aspect of the present invention which is disposed adjacent a radiator of the cooling system.
An electric-motor driven fan arrangement in accordance with the present invention and forming part of a vehicle engine cooling system will now be described, by way of example, with reference to the accompanying drawings in which: Figure 1 is a schematic view from one side of an electric-motor driven fan arrangement, partially in cross-section, mounted alongside a radiator of a vehicle engine cooling system; and
Figure 2 is a view from one end of the electric-motor driven fan arrangement shown in Fig. 1.
Referring to the drawings, the electric-motor driven fan arrangement, generally indicated at 10, is mounted adjacent a radiator 11 (shown schematically) of the engine cooling system.
The fan arrangement 10 includes an electric motor 12, for example a 1 2 volt D.C. electric motor, which drives an axial fan, generally indicated at 13, to draw air over the fins of the radiator 11 to cool the liquid coolant contained therein.
The electric motor 1 2 includes an armature 1 5 and a commutator 1 6 which are carried by a shaft 1 7 rotatably supported in two sintered bearings 1 8 mounted at respective ends of a metal housing 1 9 of the motor 1 2. The housing 1 9 carries a plurality of magnets 20 which surround the armature 1 5 and are arranged to generate magnetic flux for the armature 15, and brushes (not shown) which engage with the contacts of the commutator 16.
The motor housing 19, which effectively encloses the components 15, 16, 1 8 and 20, includes a spigot 21 which opens into the interior of the housing 1 9 adjacent both the commutator 1 6 and the rear bearing 18, and two apertures 22 in the end wall 23 of the housing 1 9 remote from the commutator 1 6.
The shaft 1 7 extends through the end wall 23 of the housing 1 9 and carries the axial fan 1 3. The fan 1 3 comprises a hub portion in the form of a generally cup-shaped member 25, and four fan blades 26 which are symmetrically spaced around an outer cylindrical surface defined by the member 25 and which extend radially outwards from that member.
The cup-shaped member 25 includes an integral hub 27 through which the shaft 1 7 extends, and is secured on the shaft 1 7 for rotation therewith by means of a nut 28 that cooperates with a screw thread provided on the end of the shaft 17.
The member 25 and the fan blades 26 may be formed from metal or plastics material as separate parts with the fan blades 26 secured to the member 25 by any suitable means.
Alternatively the member 25 and the blades 26 may be moulded as a unitary structure from plastics material.
In addition to supporting the fan blades 26, the cup-shaped member 25 overlies the end wall 23 of the motor housing 1 9 and serves to protect the electric motor 1 2 from rain droplets and dirt particles which may be carried with air passing over the radiator 11.
An annular shroud 30 of tough plastics material surrounds the fan blades 26. The shroud 30, shown partially in cross-section in
Fig. 1, is spaced radially outwards from the tips of the fan blades 26 and defines a cylindrical duct coaxial with the shaft 1 7 through which air is drawn upon rotation of the fan 1 3. Formed integrally with the shroud 30 is a spider structure 31 comprising three legs 32, 33 and 34 which are spaced at 120 intervals around the circumference of the shroud 30 and which extend generally inwards through the path of the flow of air produced by the fan towards the motor 1 2.
Each of the legs 32, 33 and 34 is attached to a respective upstanding lug 35 (only two of which are visible in Fig. 1) on the motor housing 1 9 by means of a bolt 36 so that the motor 1 2 is supported co-axially with the shroud 30. The shroud 30 is, in turn, conveniently mounted adjacent the radiator 11 either on the radiator itself or on a suitable part of the vehicle body work by means of, for example, screws which pass through a peripheral flange 37.
The leg 32 of the spider structure 31 includes a spigot 40 whose bore 41 opens adjacent the path of travel of the tips of the fan blades 36 on the high pressure side of the fan 1 3. One end of a flexible pipe 43 of plastics or rubber material is pushed over the spigot 40 so that the bore of the pipe 43 faces into the flow of air produced by the fan blades 26. The other end of the pipe 43 is coupled to the spigot 21 provided on the motor housing 1 9 so that the bore of the pipe 43 communicates with the interior of the housing 19.
When energised, the electric motor 1 2 rotatably drives the axial fan 1 3 and air is drawn over the fins of the radiator 11 by the fan blades 26 to cool the liquid coolant therein.
The fan 1 3 produces a flow of air through the annular duct defined between the inner surface of the shroud 30 and the cup-shaped member 25 which travels from right to left in
Fig. 1 around the legs 32, 33 and 34 of the spider structure 31.
A portion of this flow of air passes over the exposed surface of the motor housing 1 9 and thereby contributes to the dissipation of heat generated by the motor 1 2 during its energisation.
More importantly however, the air flow produced by the fan blades 26 is directed over the entrance to the bore of the spigot 40 in the leg 32 and is channelled through the pipe 43 into the interior of the motor housing 19.
It is believed that the flow of air produced by the fan blades 26 results in the formation of a high pressure region over the surface of the leg 32 and that this high pressure region assists in forcing air through the pipe 43 into the motor housing 1 9.
Air entering the housing 1 9 is directed over the commutator 1 6 and the rear bearing 1 8 and then flows between the armature 1 5 and the magnets 20 and over the other bearing 1 8 to cool those components of the motor 1 2. The air eventually exits from the housing 1 9 through the apertures 22 in the end wall 23 into the sheltered region between the cupshaped member 25 and the end wall 23 from whence it is drawn into the flow produced by the blades 26 of the fan 1 3.
The air flowing through the motor housing 1 9 in the above described manner dissipates heat from the interior of the motor 1 2. Even though the air used for this purpose has been warmed to some extent by the radiator 11 it is nevertheless considerabiy cooler than the interior of the motor 1 2 and is capable of reducing the temperature of the interior of the motor 1 2. In particular, the flow of air through the housing 1 9 cools those components of the motor, such as the commutator and bearings, which might othewise suffer from the effects of overheating. It has been found that, as a result of this cooling, the life expectancy of these components is considerably increased.
A filter may be disposed over the spigot 40 or in the pipe 43 if desired.
It is envisaged that more than one pipe may be provided to channel air from the flow produced by the fan 1 3 into the motor housing 1 9 in which case the one or more additional pipes may be connected between further spigots on the motor housing 1 9 and the remaining legs 33 and 34 of the spider struc ture 31. Furthermore, the number of apertures provided in the end wall 23 of the housing 1 9 through which air escapes may be varied according to requirements. Alternatively a single hole or slot may be provided.
Claims (11)
1. An electric-motor driven fan arrangement for use in an engine cooling system of the kind having a radiator through which liquid coolant is passed, and which is to be disposed adjacent a said radiator for producing a flow of air over said radiator to cool the liquid coolant therein, comprising an electric motor which includes a housing and an output shaft extending through said housing, a fan coupled to the output shaft for producing a flow of air upon rotation of said output shaft, and means for channelling some of the air flow produced by said fan into said motor housing thereby to effect cooling of the interior of said motor housing.
2. An electric-motor driven fan arrangement according to Claim 1, wherein said channelling means comprises a pipe which opens at one end into said motor housing.
3. An electric-motor driven fan arrangement according to Claim 2, wherein said electric motor includes commutator means and wherein said one end of the pipe opens into the motor housing adjacent said commutator means.
4. An electric-motor driven fan arrangement according to any one of the preceding claims, wherein said fan comprises an axial fan.
5. An electric-motor driven fan arrangement according to Claim 4, wherein the other end of said pipe opens adjacent the path of the blades of said axial fan and is arranged to face into said flow of air produced thereby.
6. An electric-motor driven fan arrangement according to Claim 5, wherein said other end of the pipe is disposed downstream of said fan blades.
7. An electric-motor driven fan arrangement according to any one of Claims 4 to 6, wherein said axial fan includes a hub portion which carries the fan blades and which is arranged to overlie one end of the motor housing.
8. An electric-motor driven fan arrangement according to Claim 7, wherein the said one end of the motor housing includes at least one aperture through which air exits from the motor housing.
9. An electric-motor driven fan arrangement according to any one of Claims 4 to 8, wherein said arrangement further includes shroud means extending around, and radially spaced from said fan blades which defines a duct for said flow of air.
1 0. An electric-motor driven fan arrangement according to Claim 9, including a member extending from said shroud means into the path of said flow of air produced by said fan.
11. An electric-motor driven fan arrangement according to Claim 10, wherein said member is attached to the electric motor and supports the electric motor on said shroud means.
1 2. An electric-motor driven fan arrangement according to either Claim 10 or Claim 11 and Claim 5, wherein the said other end of said pipe opens through an aperture in said member.
1 3. An electric-motor driven fan arrangement according to any one of the preceding claims, wherein said electric motor is located downstream of said fan.
1 4. An electric-motor driven fan arrangement substantially as hereinbefore described with reference to Figs. 1 and 2 of the accompanying drawings.
1 5. An engine cooling system including an electric-motor driven fan arrangement in accordance with any one of the preceding claims which is disposed adjacent a radiator of the cooling system.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7833813 | 1978-08-18 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2029125A true GB2029125A (en) | 1980-03-12 |
| GB2029125B GB2029125B (en) | 1983-01-12 |
Family
ID=10499142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7928644A Expired GB2029125B (en) | 1978-08-18 | 1979-08-16 | Electric-motor driven fan arrangement for use in engine cooling systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2029125B (en) |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0208909A2 (en) * | 1985-07-15 | 1987-01-21 | Rauch Landmaschinenfabrik GmbH | Device for spreading fertilizer |
| EP0304638A1 (en) * | 1987-08-26 | 1989-03-01 | AURORA Konrad G. Schulz GmbH & Co | Ventilator |
| EP0539339A1 (en) * | 1991-10-23 | 1993-04-28 | INDUSTRIE MAGNETI MARELLI S.p.A. | Rotating electric machine, particularly an alternator for motor vehicles |
| US5364025A (en) * | 1992-04-27 | 1994-11-15 | Ford Motor Company | Combination motor cooler and air aspirator for climate control system |
| FR2776140A1 (en) * | 1998-03-16 | 1999-09-17 | Asmo Co Ltd | Brushless electrical motor for an automobile air conditioning fan |
| EP0992692A1 (en) * | 1998-10-08 | 2000-04-12 | GATE S.p.A. | Fan including a duct for cooling the motor |
| WO2001033696A1 (en) * | 1999-11-03 | 2001-05-10 | Peter John King | Universal electric motor cowl |
| NL1014485C2 (en) * | 1999-04-28 | 2003-02-17 | Campbell Hausfeld Scott Fetzer | HVLP motor assembly. |
| CN102192170A (en) * | 2011-07-01 | 2011-09-21 | 中山泰坦工艺品有限公司 | Air fan with built-in fan blade |
| US8217548B2 (en) * | 2007-08-30 | 2012-07-10 | Johnson Electric S.A. | Electric motor |
| GB2495710A (en) * | 2011-10-17 | 2013-04-24 | Nidec Motors & Actuators Gmbh Germany | Motor support arm for a cooling system fan |
| CN109441863A (en) * | 2018-12-26 | 2019-03-08 | 上海诺地乐通用设备制造有限公司 | The structure and method of a kind of roof centrifugal blower and its motor cavity radiating |
| US20210218315A1 (en) * | 2018-06-21 | 2021-07-15 | Valeo Systemes Thermiques | Fan device for a motor vehicle |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105179323A (en) * | 2015-10-14 | 2015-12-23 | 新乡西玛鼓风机有限公司 | Air cooling type cooling system of heavy-duty fan |
-
1979
- 1979-08-16 GB GB7928644A patent/GB2029125B/en not_active Expired
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0208909A2 (en) * | 1985-07-15 | 1987-01-21 | Rauch Landmaschinenfabrik GmbH | Device for spreading fertilizer |
| EP0208909A3 (en) * | 1985-07-15 | 1987-11-25 | Rauch Landmaschinenfabrik Gmbh | Device for spreading fertilizer |
| EP0304638A1 (en) * | 1987-08-26 | 1989-03-01 | AURORA Konrad G. Schulz GmbH & Co | Ventilator |
| EP0539339A1 (en) * | 1991-10-23 | 1993-04-28 | INDUSTRIE MAGNETI MARELLI S.p.A. | Rotating electric machine, particularly an alternator for motor vehicles |
| US5364025A (en) * | 1992-04-27 | 1994-11-15 | Ford Motor Company | Combination motor cooler and air aspirator for climate control system |
| FR2776140A1 (en) * | 1998-03-16 | 1999-09-17 | Asmo Co Ltd | Brushless electrical motor for an automobile air conditioning fan |
| EP0992692A1 (en) * | 1998-10-08 | 2000-04-12 | GATE S.p.A. | Fan including a duct for cooling the motor |
| NL1014485C2 (en) * | 1999-04-28 | 2003-02-17 | Campbell Hausfeld Scott Fetzer | HVLP motor assembly. |
| BE1014084A3 (en) * | 1999-04-28 | 2003-04-01 | Campbell Hausfeld Scott Fetzer | Hvlp motor assembly. |
| WO2001033696A1 (en) * | 1999-11-03 | 2001-05-10 | Peter John King | Universal electric motor cowl |
| US8217548B2 (en) * | 2007-08-30 | 2012-07-10 | Johnson Electric S.A. | Electric motor |
| CN102192170A (en) * | 2011-07-01 | 2011-09-21 | 中山泰坦工艺品有限公司 | Air fan with built-in fan blade |
| GB2495710A (en) * | 2011-10-17 | 2013-04-24 | Nidec Motors & Actuators Gmbh Germany | Motor support arm for a cooling system fan |
| US20210218315A1 (en) * | 2018-06-21 | 2021-07-15 | Valeo Systemes Thermiques | Fan device for a motor vehicle |
| CN109441863A (en) * | 2018-12-26 | 2019-03-08 | 上海诺地乐通用设备制造有限公司 | The structure and method of a kind of roof centrifugal blower and its motor cavity radiating |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2029125B (en) | 1983-01-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |