US3872916A - Fan shroud exit structure - Google Patents

Fan shroud exit structure Download PDF

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Publication number
US3872916A
US3872916A US348436A US34843673A US3872916A US 3872916 A US3872916 A US 3872916A US 348436 A US348436 A US 348436A US 34843673 A US34843673 A US 34843673A US 3872916 A US3872916 A US 3872916A
Authority
US
United States
Prior art keywords
fan
shroud
section
air stream
radial
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
Application number
US348436A
Other languages
English (en)
Inventor
Harold D Beck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Navistar Inc
Case LLC
Original Assignee
International Harverster Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by International Harverster Corp filed Critical International Harverster Corp
Priority to US348436A priority Critical patent/US3872916A/en
Priority to CA184,880A priority patent/CA992409A/en
Priority to DE2411225A priority patent/DE2411225C3/de
Priority to FR7411223A priority patent/FR2224318B1/fr
Priority to SE7404430A priority patent/SE402322B/xx
Priority to NL7404587.A priority patent/NL158255B/nl
Priority to JP49037771A priority patent/JPS49129032A/ja
Priority to IT50040/74A priority patent/IT1004094B/it
Priority to BR2685/74A priority patent/BR7402685D0/pt
Priority to AU67565/74A priority patent/AU471444B2/en
Priority to GB1515174A priority patent/GB1466795A/en
Application granted granted Critical
Publication of US3872916A publication Critical patent/US3872916A/en
Assigned to PATTERSON, LINDA L., TRUSTEE, FIDELITY UNION BANK, TRUSTEE reassignment PATTERSON, LINDA L., TRUSTEE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: INTERNATIONAL HARVESTER COMPANY
Assigned to INTERNATIONAL HARVESTER COMPANY reassignment INTERNATIONAL HARVESTER COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: FIRST FIDELTY BANK, NATIONAL ASSOCIATION PATTERSON, LINDA L.; TRUSTEES
Assigned to J.I. CASE COMPANY A DE CORP reassignment J.I. CASE COMPANY A DE CORP ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL HARVESTER COMPANY A DE CORP
Assigned to CASE CORPORATION, A CORP. OF DELAWARE reassignment CASE CORPORATION, A CORP. OF DELAWARE CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: J. I. CASE COMPANY, A CORP. OF DELAWARE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted fans

Definitions

  • ABSTRACT An internal combustion engine, having a heat exchange cooling system, a fan for moving air there through and a shroud and shroud exit section for controlling the air path.
  • the shroud exit encloses the fan and includes throat (CF) radial expander (R) and radial flat (RF) sections whereby air is drawn through the heat exchanger axially and expelled radially along said exit sections.
  • a vehicle having a liquid cooled internal combustion engine and a radiator cooling sys' tem for dissipating the heat produced.
  • the radiator cooling system includes a standard radiator, an axial flow fan facing the radiator and having a plurality of angular blades whereby air is drawn rearwardly through the radiator.
  • a shroud rearwardly extends from the back face of the radiator to channel air through the radiator and hamper the fan from drawing air which has not passed through or at least come in contact with the perforated heat exchanging surfaces of the radiator. For the most part the shroud encloses the entire perforated heat exchanging rear area of the radiator.
  • a fan shroud exit means is also provided having secured to the backwardly extending portion oftbe fan shroud and extending rearwardly thereof as well as outwardly. As will be later explained it is the particular contour of this exit section in combination with an axial flow fan located therein, the location thereof also being important, which allows the air stream to be converged and directed radially away from the engine compartment. As is apparent this invention is also applicable to a stationary engine where it is desired to direct the air stream.
  • FIG. 1 is a side elevation of an internal combustion engine showing the device of my invention attached to a vehicle;
  • FIG. 2 is a fragmentary vertical section showing the relationship of the fan to the contoured exit section
  • FIG. 3 is a top view of a tractor showing the air stream of the prior art fan assemblies.
  • FIG. 4 is atop view of a tractor showing the directed air stream achieved with the radiator cooling assembly herein disclosed.
  • FIG. 1 there is shown a conventional water cooled heat producing internal combustion engine means 10 forwardly carried on longitudinally extending parallel support means 12 of vehicle means 14.
  • vehicle means 14 is a tractor, however, as will hereafter become more apparent this invention can be applied to any type ofvehicle employing a heat generating internal combustion engine or any other portable or stationary device requiring an air moving fan.
  • a water cooling radiator means 16 employed to dissipate the engine generated heat. Water flows between the waterjacket on the engine (not shown) and the radiator through a series of fluid communicating means l8 and 20.
  • sheet metal means 22 encircles engine means 10 thereby forming the engine compartment area means 24.
  • fan means 28 Carried at the forward end of engine means 10 is a fan shaft means 26 whereby power is delivered to drive fan means 28.
  • fan means 28 is a rotatable suction fan positioned opposite the radiator means 16, and normally creating a flow of air or drawing in a stream of cooling air rearwardly through the radiator with a subsequent axial discharge thereof. This axial flow of air is directed to the fan means by a shroud means 30.
  • the particular shape of the forward section 32 is dependent upon the shape and design of the perforated heat exchanging design of the radiator.
  • connection between the leading edge of 32 and the rear face 34 of the radiator will be dependent upon the particular characteristics of these components, that is, some connections being provided with air gaps while others are substantially sealed over the entire circumference of the enclosure.
  • the entire perforated area is substantially sealed against the passage of air from any other direction except through the radiator. From the forward edges the shroud means (be it a taper transition as shown or a box type) converges rearwardly to a circular rear section 36.
  • Exit shroud means 38 includes a tubular means 40, an arcuated means portion 42 and a flat flange portion means 44.
  • tubular means portion 40 forms the leading edge of the exit shroud means while arcuated means portion 42 still extending generally rearwardly simultaneously extends outwardly around an arch the reference point ofwhich is defined as point 46.
  • arcuated section 42 has a general bell-shaped appearance being a section of a transition surface or some approximation thereof.
  • arcuatcd section 42 is a section of a constant radius arch.
  • Flat flange portion 44 forms the trailing edge of exit shroud means 38 and has a major plane perpendicular to that of tubular section 40.
  • tubular means 40 will be hereafter referred to as the cylindrical throat means
  • arcuated portion 42 will be referred to as the radial expanding means
  • flat flange portion 44 will be referred to as radial flat means.
  • Overall the entire fan shroud exit means 38 has a horn-like configuration.
  • fan means 28 is rotatingly carried adjacent said radiator means and operably to establish a flow of cooling air therethrough.
  • Fan means 28 includes a plurality of fan blade means 48 (only one shown) as is well known in the art. As shown in FIG. 2 fan means 28 is surrounded by said contoured fan shroud exit section 38. The enclosure of the fan means 28 within shroud means 30 is such that a front plane struck out by the leading edge 50 is coextensive and passes through the leading section of throat means 40 and a rear plane struck out by trailing edge 52 is about coextensive and parallel with said radial flat portion 44. It should be noted, however, that there is a plus or minus error factor involved in both of these values of about 12 percent of AW. That is, the respective planes formed by the blade means can be within about 12 percent of optimum and still function satisfactorily within 4 the scope of this invention. Thus, within this range the direction air stream will still be substantially radial.
  • RF AW/3, CF AW/3, and R 2AW/3
  • RF is the length of the radial flat portion 44
  • F is the length of the cylindrical throat section 40 and R is a radius of the radial expanding section 42 or distance from the reference point to the transistion surface
  • AW is the projected axial width of fan 28.
  • FIGS. 3 and 4 show the path in which air is dispersed by the fan means comprising again a standard assembly and the improved assembly, thus, the achieved is apparent.
  • the amount or relation of the fan means 28 to the exit section means 38 is most conveniently expressed in terms of the amount of the fan which is exposed past the end of the shroud or projects rearwardly thereof. It has been found that a X,,-equal to zero gives optimum results; however, reasonable results can be achieved by having X,.; about equal to plus or minus 12 percent of AW. That is, as explained previously when the plane swept out by the rear edge is coextensive with the surface of the radial flat or within the tolerance set forth. By changing the orientation of the fan with respect to the fan exit section it is also possible to direct the air stream, straight back, at an angle off radial, etc.,
  • a heat exchange system including, a heat exchange means such as a radiator, a fan shroud and a fan shroud exit section with a fan therein.
  • An exit section includes, in order, a cylindrical throat section, a radial expanding section, and a radial flat portion. The leading edge of the cylindrical throat section being secured to the shroud around its entire circumference.
  • the fan assembly carried in the shroud exit section includes a plurality of fan blades having front or leading edges and trailing or rear edges. These edge means sweep out planes as they rotate, that is, a front and rear plane.
  • the front plane for the most part should intersect thejunction between the shroud end and the cylindrical throat while the rear plane should be parallel to and coextensive with the radial flat portion.
  • the R value in the preferred embodiment is the radius of the radial expanding section, that is, the radial expanding section is a part of a circle.
  • the fan induced stream of air is converged and directed out of the shroud exit parallel to the radial flat portion thus avoiding the passage of dust and particle laden air currents against the engine and subsequently against the operator station.
  • a method of transferring internal combustion en- 'gine produced heat for cooling said engine comprising the steps of:
  • a method for dissipating internal combustion en gine produced heat comprising the steps of:
  • a method of handling air for cooling a water jacketed internal combustion engine such that a Coanda effeet is achieved comprising the steps of:
  • a heat transfer system for an internal combustion engine comprising:
  • a heat exchanger including a front and a rear section:
  • a heat transfer system for an internal combustion engine comprising:
  • a heat exchanger having a front and a rear section
  • a shroud having a forward section arranged to enclose said rear section, and a rearwardly extending unitary contoured exit section including means defining a cylindrical throat, means defining a radial expanding section and a radial flat portion;
  • a cooling system for an internal combustion engine comprising:
  • a radiator including means defining a tube and means defining a rearward area
  • a shroud having a forward section arranged to include said rearward area of said radiator, and means defining a rearwardly extending unitary contoured exit section including a cylindrical throat, a radial expanding section and a radial flat portion;
  • said radiator includes means defining a rearwardly extending perforated area
  • a vehicle having an operator station, an internal combustion engine, a radiator for cooling fluid from said engine an axial flow fan axially facing said radiator and including a plurality of angular blades drawing air rearwardly through said radiator, and a shroud rearwardly extending from said radiator wherein the improvement comprises:
  • the shroud exit section of claim 10 wherein said fan has a front plane which intersects said tubular portion and a rear plane which intersects, plus or minus 12 percent, said flat flange portion whereby a stream of air is converged and directed outwardly parallel to said flat flange portion to prevent the passage of dust and particle laden air against said engine, and engine heat against said operator station.
  • a vehicle having an operator station and an internal combustion engine, a radiator for cooling fluid from said engine, an axial flow fan axially facing said radiator and including a plurality of angular blades drawing air rearwardly through said radiator, and a shroud rearwardly extending from said radiator wherein the im provementcomprises:
  • a unitary fan shroud exit portion secured to said shroud and extending rearwardly thereof including:
  • said fan shroud exit portion is secured to said shroud around its entire circumference
  • said blade means defines a rear plane, said plane being coextensive with said radial flat means plus or minus 12 percent.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
US348436A 1973-04-05 1973-04-05 Fan shroud exit structure Expired - Lifetime US3872916A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US348436A US3872916A (en) 1973-04-05 1973-04-05 Fan shroud exit structure
CA184,880A CA992409A (en) 1973-04-05 1973-11-02 Fan shroud exit structure
DE2411225A DE2411225C3 (de) 1973-04-05 1974-03-08 Luftfördereinrichtung an einem Kühler für Brennkraftmaschinen
FR7411223A FR2224318B1 (nl) 1973-04-05 1974-03-29
SE7404430A SE402322B (sv) 1973-04-05 1974-04-02 For motorfordon avsedd vermeoverforingsanordning
JP49037771A JPS49129032A (nl) 1973-04-05 1974-04-03
IT50040/74A IT1004094B (it) 1973-04-05 1974-04-03 Perfezionamento negli effusori per radiatori per veicoli a motore
NL7404587.A NL158255B (nl) 1973-04-05 1974-04-03 Voertuig, voorzien van een radiator, een ventilator en een van de radiator tot om de ventilator lopende omhulling.
BR2685/74A BR7402685D0 (pt) 1973-04-05 1974-04-04 Sistema de dissipacao de calor e de refrigeracao aperfeicoador e veiculo utilizando o mesmo
AU67565/74A AU471444B2 (en) 1973-04-05 1974-04-04 Fan shroud exit structure
GB1515174A GB1466795A (en) 1973-04-05 1974-04-05 Fan and cowl assembly in a vehicle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US348436A US3872916A (en) 1973-04-05 1973-04-05 Fan shroud exit structure

Publications (1)

Publication Number Publication Date
US3872916A true US3872916A (en) 1975-03-25

Family

ID=23368047

Family Applications (1)

Application Number Title Priority Date Filing Date
US348436A Expired - Lifetime US3872916A (en) 1973-04-05 1973-04-05 Fan shroud exit structure

Country Status (11)

Country Link
US (1) US3872916A (nl)
JP (1) JPS49129032A (nl)
AU (1) AU471444B2 (nl)
BR (1) BR7402685D0 (nl)
CA (1) CA992409A (nl)
DE (1) DE2411225C3 (nl)
FR (1) FR2224318B1 (nl)
GB (1) GB1466795A (nl)
IT (1) IT1004094B (nl)
NL (1) NL158255B (nl)
SE (1) SE402322B (nl)

Cited By (83)

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Publication number Priority date Publication date Assignee Title
US4173995A (en) * 1975-02-24 1979-11-13 International Harvester Company Recirculation barrier for a heat transfer system
US4180130A (en) * 1974-05-22 1979-12-25 International Harvester Company Heat exchange apparatus including a toroidal-type radiator
US4184541A (en) * 1974-05-22 1980-01-22 International Harvester Company Heat exchange apparatus including a toroidal-type radiator
US5143516A (en) * 1989-02-06 1992-09-01 Paccar Inc. Recirculation shield and fan shroud assembly
ES2052431A2 (es) * 1991-02-11 1994-07-01 Carrier Corp Estructura de orificio de ventilador y cubierta para recinto de un sistema de acondicionamiento de aire.
EP0645543A1 (en) * 1993-08-31 1995-03-29 Caterpillar Inc. Low noise cooling system
US20070036648A1 (en) * 2005-08-11 2007-02-15 York International Corporation Extended venturi fan ring
US20070224044A1 (en) * 2006-03-27 2007-09-27 Valeo, Inc. Cooling fan using coanda effect to reduce recirculation
US20080196678A1 (en) * 2004-11-04 2008-08-21 Naoya Kakishita Radiator-Shroud Structure
US20100226752A1 (en) * 2009-03-04 2010-09-09 Dyson Technology Limited Fan assembly
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Also Published As

Publication number Publication date
AU471444B2 (en) 1976-04-29
JPS49129032A (nl) 1974-12-10
IT1004094B (it) 1976-07-10
FR2224318A1 (nl) 1974-10-31
SE402322B (sv) 1978-06-26
DE2411225B2 (de) 1976-07-01
NL7404587A (nl) 1974-10-08
FR2224318B1 (nl) 1979-02-16
DE2411225A1 (de) 1974-10-24
GB1466795A (en) 1977-03-09
DE2411225C3 (de) 1981-08-20
NL158255B (nl) 1978-10-16
CA992409A (en) 1976-07-06
BR7402685D0 (pt) 1974-11-19
AU6756574A (en) 1975-10-09

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