US3832085A - Automotive fan shroud - Google Patents
Automotive fan shroud Download PDFInfo
- Publication number
- US3832085A US3832085A US00295048A US29504872A US3832085A US 3832085 A US3832085 A US 3832085A US 00295048 A US00295048 A US 00295048A US 29504872 A US29504872 A US 29504872A US 3832085 A US3832085 A US 3832085A
- Authority
- US
- United States
- Prior art keywords
- shroud
- fan
- projections
- circumferentially
- noise level
- 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
- F04D29/00—Details, component parts, or accessories
- F04D29/40—Casings; Connections of working fluid
- F04D29/52—Casings; Connections of working fluid for axial pumps
- F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
- F04D29/526—Details of the casing section radially opposing blade tips
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S415/00—Rotary kinetic fluid motors or pumps
- Y10S415/914—Device to control boundary layer
Definitions
- ABSTRACT A shroud enclosing an automotive type fan has ridges projecting from the internal surface equally spaced circumferentially to provide a circumferentially undulating pattern to the axial flow of air forced through the space between the shroud and the fan to reduce the noise level of the shroud-fan combination.
- AUTOMOTIVE FAN SHROUD This invention relates, in general, to an automotive type fan shroud. More particularly, it relates to a construction to reduce the noise level of a fan shroud combination.
- the invention provides a construction to reduce noise level in which the circumferential pattern to the flow of air past the shroud and fan blades is undulating and provided by ridges located on the internal surface of the shroud equally spaced circumferentially around the shroud.
- FIG. 1 is an end elevational view of a fan shroud embodying the invention
- FIG. 2 is a side elevational view of the fan shroud of HO. 1, with parts broken away and in section, and,
- HG. 3 shows a modification.
- the fan shroud of the invention is adapted to cooperate with a fan of the automotive type, such as, for example, that indicated at in phantom in FIGS. 1' and 2.
- the fan would be mounted in a conventional manner on the engine, and would generally be of a stamped steel or similar design having a number (4 in this case) of circumferentially spaced fan blades 12. It will be understood of course that the number and spacing and construction of the fan play no part in the present invention and is optional insofar as the fan shroud construction is concerned.
- the fan shroud in this case consists of a narrow section 14 of a thin cylinder that circumferentially surrounds and axially encloses the fan blades. It has a generally smooth exterior surface 16 that is welded or otherwise suitably secured to a generally rectangular supporting structure 18. The latter would be secured in a known manner adjacent the radiator of the motor vehicle for cooperation of the fan therewith to pull airflow through the radiator into the engine compartment.
- the upper portion of the leading edge of the fan shroud 16 is formed with a cover forcontrol purposes, for example, to control the total flow of air and provide proper restriction, as is common in an automotive fan shroud installation.
- ridges or projections 24 Attached to the inner surface 22 of shroud 14 are a plurality of ridges or projections 24 that extend axially for approximately an inch, for example, and are oriented with an axis parallel to the axis of the shroud.
- the ridges have a finger-like appearance, and are equally spaced circumferentially around the shroud inner surface, for example, in this case, approximately four inches apart.
- the ridges have a generally hat-shaped or square-like cross-section, I although FIG. 3 indicates that the ridges 24' could have a half-round crosssection with a radius of approximately 0.25 inches.
- the radial projection of the ridges defines an annular clearance space between the ridges and fan blades, as shown.
- each of the ridges 24 is tapered axially at its leading edge for a nonturbulent entrance of the air past the ridges.
- the above construction provides for the smooth entrance of air into the shroud, with the circumferentially undulating pattern reducing the shroud fan combination noise level.
- An automotive type fan shroud including a generally cylindrical section adapted to surround and axially enclose a fan and having circumferentially spaced projections from the internal surface to provide a circumferentially undulating pattern to the axial. flow of air past the shroud thereby reducing fan-shroud combination noise level the fan having blades enclosed by the shroud, a radial clearance space being provided between the inner extremities of the projections and the outer radial extent of the fan blades.
- a fan shroud as in claim 1 the projections each having a finger like appearance oriented parallel to the shroud axis and the projections together being equally spaced circumferentially around the shroud internal surface.
- a fan shroud as in claim 2, the projections having an axially extending taper at the air entrance end.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
A shroud enclosing an automotive type fan has ridges projecting from the internal surface equally spaced circumferentially to provide a circumferentially undulating pattern to the axial flow of air forced through the space between the shroud and the fan to reduce the noise level of the shroud-fan combination.
Description
United States Patent [191 DeFauw et a1.
AUTOMOTIVE FAN SHROUD Inventors: Raymond Henry DeFauw,
Dearborn; Raymond G. Murley, Dearborn Heights, both of Mich.
Ford Motor Company, Dearbom, Mich.
Filed: Oct. 4, 1972 Appl. No.: 295,048
Assignee:
US. Cl 415/119, 415/185, 415/DIG. 1 Int. Cl. F01d 25/04 Field of Search 415/182, 183, 184, 185,
415/186, 209, DIG. 1; 181/33 HA, 33 HB References Cited UNITED STATES PATENTS 11/1928 Schmidt 415/209 3/1935 Funk 415/209 5/1940 Forrest 415/209 1 Aug. 27, 1974 2,558,816 7/1951 Bruynes 415/D1G. 1 2,650,752 9/1953 Hoadley.... 415/D1G. 1 2,844,001 7/1958 Alford 415/D1G. 1 2,944,623 7/1960 Dodine, Jr 181/33 HB 3,610,262 10/1971 Wise 181/33 HA FOREIGN PATENTS OR APPLICATIONS 1,161,481 1/1964 Germany 415/D1G. 1
Primary ExaminerHenry F. Raduazo Attorney, Agent, or FirmKeith L. Zerschling; Robert E. McCollum [57] ABSTRACT A shroud enclosing an automotive type fan has ridges projecting from the internal surface equally spaced circumferentially to provide a circumferentially undulating pattern to the axial flow of air forced through the space between the shroud and the fan to reduce the noise level of the shroud-fan combination.
3 Clains, 3 Drawing Figures PAIENIEDmszmm FlG.3
FIG.&
AUTOMOTIVE FAN SHROUD This invention relates, in general, to an automotive type fan shroud. More particularly, it relates to a construction to reduce the noise level of a fan shroud combination.
The use of a shroud to surround an automotive type fan to increase the efficiency of airflow through the engine compartment invariably also increases the noise level of the combination. Devices have been suggested for reducing the noise level, such as, for example, changing the curvature in an axial direction of the shroud. Such is shown, for example, in US. Pat. No. 3,334,807, Fan, K. D. McMahan. Another suggestion is to decrease the turbulence of flow through the shroud to decrease noise level, as shown, for example, in US. Pat. No. 3,433,403, Fan Inlet Shroud, Gerlitz. It will be noted, however, that, in both of the above instances, the circumferential pattern of air as it flows axially through the shroud is the same as other constructions, the airflow pattern in an axial direction being changed but not'circumferentially.
The invention provides a construction to reduce noise level in which the circumferential pattern to the flow of air past the shroud and fan blades is undulating and provided by ridges located on the internal surface of the shroud equally spaced circumferentially around the shroud.
it is a primary object of the invention, therefore, to provide an automotive type fan shroud construction with a reduced noise level.
It is a further object of the invention to provide a fan shroud with internal ridges equally spaced circumferentially and projecting into the path of axial flow of air through the shroud so as to provide an overall circumferential undulating flow pattern to the air to reduce the noise level of the fan-shroud combination.
Other objects, features and advantages of the invention will become more apparent upon reference to the succeeding detailed description thereof, and to the drawings illustrating a preferred embodiment thereof, wherein;
FIG. 1 is an end elevational view of a fan shroud embodying the invention;
FIG. 2 is a side elevational view of the fan shroud of HO. 1, with parts broken away and in section, and,
HG. 3 shows a modification.
As stated previously, the fan shroud of the invention is adapted to cooperate with a fan of the automotive type, such as, for example, that indicated at in phantom in FIGS. 1' and 2. The fan would be mounted in a conventional manner on the engine, and would generally be of a stamped steel or similar design having a number (4 in this case) of circumferentially spaced fan blades 12. It will be understood of course that the number and spacing and construction of the fan play no part in the present invention and is optional insofar as the fan shroud construction is concerned.
The fan shroud in this case consists of a narrow section 14 of a thin cylinder that circumferentially surrounds and axially encloses the fan blades. It has a generally smooth exterior surface 16 that is welded or otherwise suitably secured to a generally rectangular supporting structure 18. The latter would be secured in a known manner adjacent the radiator of the motor vehicle for cooperation of the fan therewith to pull airflow through the radiator into the engine compartment.
As best seen in FIG. 2, the upper portion of the leading edge of the fan shroud 16 is formed with a cover forcontrol purposes, for example, to control the total flow of air and provide proper restriction, as is common in an automotive fan shroud installation.
Attached to the inner surface 22 of shroud 14 are a plurality of ridges or projections 24 that extend axially for approximately an inch, for example, and are oriented with an axis parallel to the axis of the shroud. The ridges have a finger-like appearance, and are equally spaced circumferentially around the shroud inner surface, for example, in this case, approximately four inches apart. The ridges have a generally hat-shaped or square-like cross-section, I although FIG. 3 indicates that the ridges 24' could have a half-round crosssection with a radius of approximately 0.25 inches. The radial projection of the ridges defines an annular clearance space between the ridges and fan blades, as shown. It will be obvious, of course, that other crosssectional configurations could be used without departing from the scope of the invention. As best seen in FIG. 2, each of the ridges 24 is tapered axially at its leading edge for a nonturbulent entrance of the air past the ridges.
From the above, it will be seen that the airflow past the interior of the shroud as a whole will have a smoothly undulating pattern in a circumferential direction, but that otherwise the axial flow of air is essentially in parallel streamlines except forthat portion of air blocked by the cover or baffle 20.
The above construction provides for the smooth entrance of air into the shroud, with the circumferentially undulating pattern reducing the shroud fan combination noise level.
While the invention has been described and illustrated in its preferred embodiments in the drawings, it will be clear to those skilled in the arts to which it pertains that many changes and modifications may be made thereto without departing from the scope of the invention.
We claim:
1. An automotive type fan shroud including a generally cylindrical section adapted to surround and axially enclose a fan and having circumferentially spaced projections from the internal surface to provide a circumferentially undulating pattern to the axial. flow of air past the shroud thereby reducing fan-shroud combination noise level the fan having blades enclosed by the shroud, a radial clearance space being provided between the inner extremities of the projections and the outer radial extent of the fan blades.
2. A fan shroud as in claim 1, the projections each having a finger like appearance oriented parallel to the shroud axis and the projections together being equally spaced circumferentially around the shroud internal surface.
3. A fan shroud as in claim 2, the projections having an axially extending taper at the air entrance end.
Claims (3)
1. An automotive type fan shroud including a generally cylindrical section adapted to surround and axially enclose a fan and having circumferentially spaced projections from the internal surface to provide a circumferentially undulating pattern to the axial flow of air past the shroud thereby reducing fan-shroud combination noise level the fan having blades enclosed by the shroud, a radial clearance space being provided between the inner extremities of the projections and the outer radial extent of the fan blades.
2. A fan shroud as in claim 1, the projections each having a finger like appearance oriented parallel to the shroud axis and the projections together being equally spaced circumferentially around the shroud internal surface.
3. A fan shroud as in claim 2, the projections having an axially extending taper at the air entrance end.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00295048A US3832085A (en) | 1972-10-04 | 1972-10-04 | Automotive fan shroud |
CA176,264A CA996080A (en) | 1972-10-04 | 1973-07-12 | Automotive fan shroud |
AU59367/73A AU470728B2 (en) | 1972-10-04 | 1973-08-20 | Automotive fan shroud |
DE19732345506 DE2345506A1 (en) | 1972-10-04 | 1973-09-08 | AIR CONDUCTING DEVICE FOR FANS, IN PARTICULAR FOR VEHICLE ENGINES |
GB4362673A GB1412680A (en) | 1972-10-04 | 1973-09-18 | Fan shrouds particularly for fans for automobile engines |
JP48111048A JPS4971335A (en) | 1972-10-04 | 1973-10-04 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US00295048A US3832085A (en) | 1972-10-04 | 1972-10-04 | Automotive fan shroud |
Publications (1)
Publication Number | Publication Date |
---|---|
US3832085A true US3832085A (en) | 1974-08-27 |
Family
ID=23135994
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00295048A Expired - Lifetime US3832085A (en) | 1972-10-04 | 1972-10-04 | Automotive fan shroud |
Country Status (6)
Country | Link |
---|---|
US (1) | US3832085A (en) |
JP (1) | JPS4971335A (en) |
AU (1) | AU470728B2 (en) |
CA (1) | CA996080A (en) |
DE (1) | DE2345506A1 (en) |
GB (1) | GB1412680A (en) |
Cited By (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4061188A (en) * | 1975-01-24 | 1977-12-06 | International Harvester Company | Fan shroud structure |
JPS53115914A (en) * | 1977-03-18 | 1978-10-09 | Matsushita Electric Ind Co Ltd | Electric blower |
JPS53115913A (en) * | 1977-03-18 | 1978-10-09 | Matsushita Electric Ind Co Ltd | Electric blower |
JPS53115912A (en) * | 1977-03-18 | 1978-10-09 | Matsushita Electric Ind Co Ltd | Electric blower |
US4152094A (en) * | 1975-10-31 | 1979-05-01 | Hitachi, Ltd. | Axial fan |
US4662818A (en) * | 1983-07-23 | 1987-05-05 | International Standard Electric Corporation | Tangential blower |
US4927328A (en) * | 1989-03-02 | 1990-05-22 | Scoates William D | Shroud assembly for axial flow fans |
US5277541A (en) * | 1991-12-23 | 1994-01-11 | Allied-Signal Inc. | Vaned shroud for centrifugal compressor |
US5507703A (en) * | 1992-07-16 | 1996-04-16 | Gkn Viscodrive Gmbh | Differential drive |
US5518364A (en) * | 1993-03-27 | 1996-05-21 | Deutsche Forschungsanstalt For Luft-Und Raumfahrt E.V. | Method for the reduction of sound emission as well as for the improvement of the air output and the efficiency in an axial flow machine, and flow machine |
US6123051A (en) * | 1998-08-12 | 2000-09-26 | Chrysler Corporation | Shroud for an engine cooling fan |
US6264427B1 (en) | 1999-02-10 | 2001-07-24 | Shop-Vac Corporation | Vaneless impeller housing for a vacuum cleaner |
US6375416B1 (en) | 1993-07-15 | 2002-04-23 | Kevin J. Farrell | Technique for reducing acoustic radiation in turbomachinery |
US6746391B2 (en) * | 2001-11-09 | 2004-06-08 | Eppendorf Ag | Swing-out-rotor laboratory centrifuge with noise abatement system |
FR2943000A1 (en) * | 2009-03-12 | 2010-09-17 | Peugeot Citroen Automobiles Sa | Nozzle for motor-driven fan or fixed collar in motor vehicle e.g. hybrid vehicle, has rotation face whose fractal dimension is higher than specific value permitting localization of acoustic modes near of raised and/or hollow elements |
US20110064559A1 (en) * | 2006-06-27 | 2011-03-17 | Socpra-Sciences Et Genie, S.E.C. | Method and apparatus for controlling tonal noise from subsonic fans |
US9180772B2 (en) * | 2011-04-26 | 2015-11-10 | Denso Thermal Systems S.P.A. | Fan assembly for vehicles |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5540342Y2 (en) * | 1975-07-10 | 1980-09-20 | ||
JP2767045B2 (en) * | 1988-10-31 | 1998-06-18 | 臼井国際産業 株式会社 | Radiator shroud |
EP0746689B1 (en) * | 1993-08-30 | 2002-04-24 | Robert Bosch Corporation | Housing with recirculation control for use with banded axial-flow fans |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1693352A (en) * | 1922-12-06 | 1928-11-27 | Westinghouse Electric & Mfg Co | Dredger pump |
US1993158A (en) * | 1930-09-08 | 1935-03-05 | George D Roper Corp | Air moving apparatus |
US2202790A (en) * | 1938-02-23 | 1940-05-28 | Allis Chalmers Mfg Co | Waste paper stock pump |
US2558816A (en) * | 1947-08-16 | 1951-07-03 | United Aircraft Corp | Fluid mixing device |
US2650752A (en) * | 1949-08-27 | 1953-09-01 | United Aircraft Corp | Boundary layer control in blowers |
US2844001A (en) * | 1953-01-06 | 1958-07-22 | Gen Electric | Flow straightening vanes for diffuser passages |
US2944623A (en) * | 1955-09-02 | 1960-07-12 | Jr Albert G Bodine | Jet engine noise reducer |
DE1161481B (en) * | 1960-03-19 | 1964-01-16 | Voith Gmbh J M | Device for stabilizing the characteristics of centrifugal machines with an axially flowed impeller |
US3610262A (en) * | 1969-10-07 | 1971-10-05 | Boeing Co | Stowable vane sonic throat inlet for jet aircraft noise suppression |
-
1972
- 1972-10-04 US US00295048A patent/US3832085A/en not_active Expired - Lifetime
-
1973
- 1973-07-12 CA CA176,264A patent/CA996080A/en not_active Expired
- 1973-08-20 AU AU59367/73A patent/AU470728B2/en not_active Expired
- 1973-09-08 DE DE19732345506 patent/DE2345506A1/en active Pending
- 1973-09-18 GB GB4362673A patent/GB1412680A/en not_active Expired
- 1973-10-04 JP JP48111048A patent/JPS4971335A/ja active Pending
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1693352A (en) * | 1922-12-06 | 1928-11-27 | Westinghouse Electric & Mfg Co | Dredger pump |
US1993158A (en) * | 1930-09-08 | 1935-03-05 | George D Roper Corp | Air moving apparatus |
US2202790A (en) * | 1938-02-23 | 1940-05-28 | Allis Chalmers Mfg Co | Waste paper stock pump |
US2558816A (en) * | 1947-08-16 | 1951-07-03 | United Aircraft Corp | Fluid mixing device |
US2650752A (en) * | 1949-08-27 | 1953-09-01 | United Aircraft Corp | Boundary layer control in blowers |
US2844001A (en) * | 1953-01-06 | 1958-07-22 | Gen Electric | Flow straightening vanes for diffuser passages |
US2944623A (en) * | 1955-09-02 | 1960-07-12 | Jr Albert G Bodine | Jet engine noise reducer |
DE1161481B (en) * | 1960-03-19 | 1964-01-16 | Voith Gmbh J M | Device for stabilizing the characteristics of centrifugal machines with an axially flowed impeller |
US3610262A (en) * | 1969-10-07 | 1971-10-05 | Boeing Co | Stowable vane sonic throat inlet for jet aircraft noise suppression |
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4061188A (en) * | 1975-01-24 | 1977-12-06 | International Harvester Company | Fan shroud structure |
US4152094A (en) * | 1975-10-31 | 1979-05-01 | Hitachi, Ltd. | Axial fan |
JPS53115914A (en) * | 1977-03-18 | 1978-10-09 | Matsushita Electric Ind Co Ltd | Electric blower |
JPS53115913A (en) * | 1977-03-18 | 1978-10-09 | Matsushita Electric Ind Co Ltd | Electric blower |
JPS53115912A (en) * | 1977-03-18 | 1978-10-09 | Matsushita Electric Ind Co Ltd | Electric blower |
US4662818A (en) * | 1983-07-23 | 1987-05-05 | International Standard Electric Corporation | Tangential blower |
US4927328A (en) * | 1989-03-02 | 1990-05-22 | Scoates William D | Shroud assembly for axial flow fans |
US5277541A (en) * | 1991-12-23 | 1994-01-11 | Allied-Signal Inc. | Vaned shroud for centrifugal compressor |
US5507703A (en) * | 1992-07-16 | 1996-04-16 | Gkn Viscodrive Gmbh | Differential drive |
US5518364A (en) * | 1993-03-27 | 1996-05-21 | Deutsche Forschungsanstalt For Luft-Und Raumfahrt E.V. | Method for the reduction of sound emission as well as for the improvement of the air output and the efficiency in an axial flow machine, and flow machine |
US6375416B1 (en) | 1993-07-15 | 2002-04-23 | Kevin J. Farrell | Technique for reducing acoustic radiation in turbomachinery |
US6123051A (en) * | 1998-08-12 | 2000-09-26 | Chrysler Corporation | Shroud for an engine cooling fan |
US6358005B1 (en) | 1999-02-10 | 2002-03-19 | Shop Vac Corporation | Vaneless impeller housing for a vacuum cleaner |
US6264427B1 (en) | 1999-02-10 | 2001-07-24 | Shop-Vac Corporation | Vaneless impeller housing for a vacuum cleaner |
US6485259B2 (en) | 1999-02-10 | 2002-11-26 | Shop Vac Corporation | Vaneless impeller housing for a vacuum cleaner |
US6746391B2 (en) * | 2001-11-09 | 2004-06-08 | Eppendorf Ag | Swing-out-rotor laboratory centrifuge with noise abatement system |
US20110064559A1 (en) * | 2006-06-27 | 2011-03-17 | Socpra-Sciences Et Genie, S.E.C. | Method and apparatus for controlling tonal noise from subsonic fans |
US8777560B2 (en) | 2006-06-27 | 2014-07-15 | Socpra—Sciences et Genie, S.E.C. | Method and apparatus for controlling tonal noise from subsonic fans |
FR2943000A1 (en) * | 2009-03-12 | 2010-09-17 | Peugeot Citroen Automobiles Sa | Nozzle for motor-driven fan or fixed collar in motor vehicle e.g. hybrid vehicle, has rotation face whose fractal dimension is higher than specific value permitting localization of acoustic modes near of raised and/or hollow elements |
US9180772B2 (en) * | 2011-04-26 | 2015-11-10 | Denso Thermal Systems S.P.A. | Fan assembly for vehicles |
Also Published As
Publication number | Publication date |
---|---|
GB1412680A (en) | 1975-11-05 |
DE2345506A1 (en) | 1974-04-11 |
JPS4971335A (en) | 1974-07-10 |
CA996080A (en) | 1976-08-31 |
AU470728B2 (en) | 1976-03-25 |
AU5936773A (en) | 1975-02-20 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3832085A (en) | Automotive fan shroud | |
US5997246A (en) | Housing for a centrifugal blower | |
US5466120A (en) | Blower with bent stays | |
US4181172A (en) | Fan shroud arrangement | |
US6896478B2 (en) | Dual fan blower with axial expansion | |
AU605042B2 (en) | Shrouding for engine cooling fan | |
BR0115868B1 (en) | Centrifugal fan assembly, Centrifugal rotor manufacturing method and Centrifugal fan assembly method. | |
US4202296A (en) | Cooling system for internal combustion engines | |
US4470753A (en) | Radial blower, especially for heaters or air conditioning systems in vehicles | |
US4432694A (en) | Blower | |
US6874990B2 (en) | Integral tip seal in a fan-shroud structure | |
US4396351A (en) | Engine cooling fan | |
US3730642A (en) | Cooling means for motor of a wet pick-up vacuum sweeper | |
US3531221A (en) | Ventilator with axial propeller wheel | |
GB2037890A (en) | Cooling system for internal combustion engines | |
US3199774A (en) | In-duct fan | |
JPH06336927A (en) | Air blower | |
JPH07197896A (en) | Fuel pump for automobile | |
JPS63146196U (en) | ||
US3368744A (en) | Ventilator fan impeller | |
US2980990A (en) | Spiral blower wheel | |
US2350939A (en) | Blower | |
US3464622A (en) | Blower fan | |
US3098603A (en) | Centrifugal fan housings | |
US6162016A (en) | Centrifugal blower assembly |