GB2311562A - Fan cowl - Google Patents
Fan cowl Download PDFInfo
- Publication number
- GB2311562A GB2311562A GB9606563A GB9606563A GB2311562A GB 2311562 A GB2311562 A GB 2311562A GB 9606563 A GB9606563 A GB 9606563A GB 9606563 A GB9606563 A GB 9606563A GB 2311562 A GB2311562 A GB 2311562A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fan
- flow
- radiator
- installation
- region
- 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- Withdrawn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
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
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/54—Fluid-guiding means, e.g. diffusers
- F04D29/541—Specially adapted for elastic fluid pumps
- F04D29/545—Ducts
-
- 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
- F04D29/08—Sealings
- F04D29/16—Sealings between pressure and suction sides
- F04D29/161—Sealings between pressure and suction sides especially adapted for elastic fluid pumps
- F04D29/164—Sealings between pressure and suction sides especially adapted for elastic fluid pumps of an axial flow wheel
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Description
COWL FOR A FAN
A radiator of a motor vehicle engine cooling system is commonly arranged for ambient air to be drawn through it by means of an engine-driven fan which faces it. The fan may be a ring fan, in which a bladed impeller is arranged to rotate within a short cylindrical housing (the ring) extending about its periphery and forming part of a fan housing, or may be an open-bladed fan.
Because the fan is mounted on the engine and the radiator on the vehicle body, allowance has to be made for relative movements to occur between the two in directions radially of the fan. There is necessarily, therefore, a clearance around the fan. Various proposals have been made for alleviating the inefficiencies inherent in the tendency for a back-flow of ambient air to be drawn from the engine side of the fan through the clearance. Any such back-flow inevitably reduces the efficiency of the fan in drawing air through the radiator, but furthermore mixing of the backflow with the fan flow being drawn through the radiator is undesirable.
Most proposals made have involved the provision of cowls which project from the radiator as deflectors to divert the back-flow directly into the periphery of the fan, so preventing its mixing with the fan flow in the region between the fan and the radiator. However, such proposals simply divert the back-flow and make little attempt to reduce it.
It is an object of the present invention to provide an improved fan installation whereby back-flow into the fan flow is inhibited.
The invention provides, in one of its aspects, a fan installation in which there is a clearance around the periphery of the fan through which a back-flow of air may be drawn, the installation comprising deflecting means located in or adjacent to a tip vortex region of the fan and arranged to turn back-flow on itself within the region in order to reinforce blade tip eddies in the region, whereby to inhibit back-flow and militate against the ingestion of back-flow at the periphery of the fan.
The deflecting means may comprise a barrier of channel form, for example scoop-forming means which is generally C-shaped in cross-section.
The invention provides, in another of its aspects, a radiator installation in a motor vehicle in which an engine-driven fan facing the radiator is arranged to draw cooling air through the radiator, there being a clearance around the periphery of the fan through which a back-flow of ambient air may be drawn from the engine side of the fan and the installation comprising deflecting means located in or adjacent to a tip vortex region of the fan and arranged to turn back-flow on itself within the region in order to reinforce blade tip eddies in the region, whereby to inhibit back-flow and militate against the ingestion of back-flow at the periphery of the fan.
In a preferred construction, the deflecting means comprises a scoop-forming member facing the clearance around the fan. The scoop-forming member may be part of a cowl extending from around the radiator towards the fan and comprising also an outer limb bounding the clearance about the fan and being arranged to guide back-flow into the scoop-forming member. The scoop-forming member may take any suitable shape.
There now follows a description, to be read with reference to the accompanying drawing, of a radiator and ring fan installation in a motor vehicle engine cooling system which illustrates the invention by way of example.
The accompanying Fig.1 is a schematic illustration of the installation.
For an engine cooling system of a motor vehicle, a radiator 10 is arranged to have ambient cooling air drawn through it by means of a ring fan 12 driven by the engine.
The radiator 10 is secured to bodywork of the vehicle and the fan is mounted on the engine in a conventional manner, and as a consequence movement of the fan relative to the radiator occurs as the engine moves on its mountings when running.
The fan comprises a short cylindrical housing 14 (i.e. the fan ring) which surrounds impeller blades (not shown) of the fan and there is a clearance 16 all around the housing, radially between the housing and an outer limb 18 of a cowl which extends from the radiator (or bodywork adjacent to the radiator) to surround the fan housing. The purpose of the cowl is to form ducting between the radiator and the fan so that so far as possible the fan acts to draw air through the radiator rather than from elsewhere.
However, there is necessarily some back-flow of ambient air through the clearance 16 around the fan housing.
In order to minimise back-flow, and particularly the effects of back-flow on the performance of the fan in relation to the radiator, the cowl comprises deflecting means providing a barrier 20 of channel form and comprising a scoop-forming portion which is of a generally C-shaped form in cross-section and presents an opening 22 facing towards the clearance 16. The scoop-forming portion is positioned between the radiator and the fan, in or adjacent to a tip vortex region of the fan, being spaced slightly from the fan housing to leave a small gap 24 in the axial direction of the fan.
The effect of the channel-form barrier is to inhibit the back-flow by turning it back on itself to create eddies within the tip vortex region which reinforce and stabiiise blade tip eddies in the region, so inhibiting passage of back-flow onwards to mix with the fan flow being drawn through the radiator. The overall effect of the barrier is both to reduce back-flow and to militate against the ingestion of the back-flow into the fan at its periphery.
Claims (10)
1. A fan installation in which there is a clearance around
the periphery of the fan through which a back-flow of
air may be drawn, the installation comprising
deflecting means located in or adjacent to a tip vortex
region of the fan and arranged to turn back-flow on
itself within the region in order to reinforce blade
tip eddies in the region, whereby to inhibit back-flow
and militate against the ingestion of back-flow at the
periphery of the fan.
2. An installation according to claim 1 in which the
deflecting means comprises a barrier of channel form
facing the clearance around the fan.
3. An installation according to claim 2 in which the
barrier provides scoop-forming means which is generally
C-shaped in cross-section.
4. An installation according to any one of claims 1 to 3
in which the fan is a ring fan.
5. A radiator installation in a motor vehicle in which an
engine-driven fan facing the radiator is arranged to
draw cooling air through the radiator, there being a
clearance around the periphery of the fan through which
a back-flow of ambient air may be drawn from the engine
side of the fan and the installation comprising
deflecting means located in or adjacent to a tip vortex
region of the fan and arranged to turn back-flow on
itself within the region in order to reinforce blade
tip eddies in the region, whereby to inhibit back-flow
and militate against the ingestion of back-flow at the
periphery of the fan.
6. An installation according to claim 5 in which the
deflecting means comprises scoop-forming means facing
the clearance around the fan.
7. An installation according to claim 6 in which the
scoop-forming means is part of a cowl extending from
around the radiator towards the fan.
8. An installation according to either of claims 6 and 7
in which the scoop-forming means is generally C-shaped
in cross-section.
9. An installation according to any one of claims 5 to 8
in which the fan is a ring fan.
10.A radiator fan installation substantially as
hereinbefore described with reference to the
accompanying drawing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9606563A GB2311562A (en) | 1996-03-28 | 1996-03-28 | Fan cowl |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9606563A GB2311562A (en) | 1996-03-28 | 1996-03-28 | Fan cowl |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9606563D0 GB9606563D0 (en) | 1996-06-05 |
| GB2311562A true GB2311562A (en) | 1997-10-01 |
Family
ID=10791212
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9606563A Withdrawn GB2311562A (en) | 1996-03-28 | 1996-03-28 | Fan cowl |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2311562A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109098983A (en) * | 2017-06-21 | 2018-12-28 | 日立空调·家用电器株式会社 | Electric blowing machine |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB355549A (en) * | 1929-10-14 | 1931-08-27 | Schmidt Sche Heissdampf | Improvements in and relating to fan-operated induced-draught installations |
| US4515071A (en) * | 1982-04-05 | 1985-05-07 | Zach Elmer S | Ventilation air control unit |
| US4566852A (en) * | 1982-03-15 | 1986-01-28 | Sueddeutsche Kuehlerfabrik Julius Fr. Behr Gmbh & Co. Kg | Axial fan arrangement |
| WO1989007717A1 (en) * | 1988-02-11 | 1989-08-24 | Robert Bosch Gmbh | Axial fan |
| US4927328A (en) * | 1989-03-02 | 1990-05-22 | Scoates William D | Shroud assembly for axial flow fans |
| US5423660A (en) * | 1993-06-17 | 1995-06-13 | Airflow Research And Manufacturing Corporation | Fan inlet with curved lip and cylindrical member forming labyrinth seal |
-
1996
- 1996-03-28 GB GB9606563A patent/GB2311562A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB355549A (en) * | 1929-10-14 | 1931-08-27 | Schmidt Sche Heissdampf | Improvements in and relating to fan-operated induced-draught installations |
| US4566852A (en) * | 1982-03-15 | 1986-01-28 | Sueddeutsche Kuehlerfabrik Julius Fr. Behr Gmbh & Co. Kg | Axial fan arrangement |
| US4515071A (en) * | 1982-04-05 | 1985-05-07 | Zach Elmer S | Ventilation air control unit |
| WO1989007717A1 (en) * | 1988-02-11 | 1989-08-24 | Robert Bosch Gmbh | Axial fan |
| US4927328A (en) * | 1989-03-02 | 1990-05-22 | Scoates William D | Shroud assembly for axial flow fans |
| US5423660A (en) * | 1993-06-17 | 1995-06-13 | Airflow Research And Manufacturing Corporation | Fan inlet with curved lip and cylindrical member forming labyrinth seal |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109098983A (en) * | 2017-06-21 | 2018-12-28 | 日立空调·家用电器株式会社 | Electric blowing machine |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9606563D0 (en) | 1996-06-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |