US3173605A - Fan housing - Google Patents

Fan housing Download PDF

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Publication number
US3173605A
US3173605A US289498A US28949863A US3173605A US 3173605 A US3173605 A US 3173605A US 289498 A US289498 A US 289498A US 28949863 A US28949863 A US 28949863A US 3173605 A US3173605 A US 3173605A
Authority
US
United States
Prior art keywords
insert
finger
fan
housing
shell
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
US289498A
Other languages
English (en)
Inventor
Dwight E Harris
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.)
Rotron Manufacturing Co Inc
Original Assignee
Rotron Manufacturing Co Inc
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 Rotron Manufacturing Co Inc filed Critical Rotron Manufacturing Co Inc
Priority to US289498A priority Critical patent/US3173605A/en
Priority to GB25112/64A priority patent/GB1004745A/en
Priority to FR978971A priority patent/FR1399245A/fr
Priority to DE19641428227 priority patent/DE1428227A1/de
Application granted granted Critical
Publication of US3173605A publication Critical patent/US3173605A/en
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
    • F04D29/547—Ducts having a special shape in order to influence fluid flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator

Definitions

  • This invention relates in general to fans and more particularly to fans having a diverging throat.
  • Fans which have a diverging throat are generally employed where a relatively high pressure differential must be created.
  • the relatively high pressure differential is required to overcome the resistance created by a filter through which the air circulates.
  • a filter between the fan and the equipment and, in addition, the equipment is inside a casing so that both the filter and the relative airtightness of the casing impose considerable resistance to the movement of air.
  • the fan must build up a pressure differential considerably greater than that provided by the conventional straight throat fan.
  • a preferred type of fan design to build up adequate pressure is one which has a diverging throat and in which there is relatively close tolerances between the ends of the fan blade and the peripheral throat surface.
  • the spokes of the housing around the fan blade should be located downstream in order to avoid creating turbulences in the air that impinges on the fan blades and thus to avoid noise and inefficiency. Since the throat periphery diverges in the direction of air movement through the throat, there results a total fan blade housing which makes it impossible to assemble the fan blades into the housing without building a two piece frame. In addition, close axial tolerances must be maintained on the positioning of the fan blades so that the fan blade itself will maintain the proper close clearance between the edges of the fan blade and the throat periphery formed by the inner wall of the housing within which the fan blade is located.
  • FIG. 1 is a front elevation of the housing of this invention
  • FIG 2 is a partial section along the plane 2-2 of FIG. 1;
  • FIG. 3 is a cross-section, of the inner wall insert, taken through a locking tab on the insert;
  • FIG. 4 is an elevation of a segment of the insert of FIG. 2;
  • FIG. 5 is a section along the inner surface of the fan frame showing the sockets adapted to engage the tabs on the insert;
  • FIG. 6 is a section along 6-6 in FIG. 5; the section being taken through the assembled housing to show the engagement between frame sockets and insert tab.
  • FIG. 1 is a somewhat simplified illustration of a fan 10 embodying this invention.
  • Fan blades 11 are mounted on a hub 12 to form what we might term the skeleton fan.
  • the motor which drives the fan blades 11.
  • the housing 15 Around this skeleton fan composed of fan blades 11 and hub 12, there is positioned the housing 15.
  • the housing 15 includes a hub cap 16 to which the hub 12 is journaled for rotation. From the hub cap 16 spokes 17 extend radially to support the peripheral shell 18 an insert 24.
  • the inner wall 19 of the housing 15 diverges in the direction of air current flow except for the bell-shaped mouth portion 20.
  • the outer edges of the fan blades 11 closely conform to the diverging inner wall 19 with only enough clearance so that the fan blades are completely free to rotate.
  • the area between the hub 12 and inner wall 19, within which the blades 11 are located, is the throat 21 of this fan 10.
  • the spokes 17 must be located downstream of the air flow through the throat 21 so as not to create turbulences in the air that impinges on the fan blade 11 and thus to avoid noise and inefficiency.
  • the housing 15 is made in two pieces as illustrated.
  • the peripheral shell 18, spokes 17 and hub cap 16 are made as one integral unit called herein the frame.
  • the second unit is an annular insert 24 having a wedge-shaped crosssection which is removably mounted on the inside of the peripheral shell 18 to form the diverging inner wall 19.
  • the frame and the insert 24 together constitute the housing 15.
  • the insert 24 is made of a resilient plastic material, so as to be tough and springy.
  • the material must be resilient such as is exemplified by any of the typical thermoplastic materials.
  • the insert 24 is snapped into the frame by means of projections 26 located on fingers 28, which fingers 28 form part of the outer surface of the insert 24.
  • the exact arrangement of these projections 26 and fingers 28 can best be understood by reference to FIGS. 2 through 5.
  • a cross-section of the insert 24 at the place where a finger 28 is located is shown in FIG. 2.
  • the finger 28 is formed by an undercutting near the outer surface 30 of the insert 24.
  • the undercutting provides an area 29 beneath the finger and into which the finger 28 can be flexed so that the projection 26 can pass under the shell 18. Since the finger 28 must be free to flex, to side cuts 31 are required, as shown in FIG. 3.
  • Two of these fingers 28, spaced apart together with outwardly extending projections 26, have been found to be adequate and preferable.
  • the fingers 28 are located near the inlet to the fan 10.
  • Matching sockets 33 for the projections 26 are provided in the inner wall 34 of the shell 18 near the inlet side of the housing 15.
  • the innerwal'l'sae'frne shell I8 will intercept the projections 26 and because of the curved leading surfaces 35 on the projections 26 will exert a radial pressure component which .will deflect the finger 28 inwardly until the projections 26 can pass under the shell 18.
  • the insert 24 is then pushed and rotated under the shell 18 until the projections 26snap into place inside a socket 33,
  • any number of. sockets 33 could be included in association with a single projection 26 to provide a greater number of adjustni'gsteps at any desired axial increment.
  • the undercut area 29 is illustrated as annular since it is easier to moldl the insert 24 in such'a fashion Obviously, the area 29 need only extend between sidecuts 31.
  • insert material could beselected so that a it woul'dfibe possible to avoid having to provide for the required flexibility by means. of the undercut area and side cuts 31.
  • insert materials whose compressibliity is such that the body of the insert could be solid and yet themateri'al would give 'enoughso-that a projection :26 could'be passed under theshell 18.
  • the projection 26 be resiliently mounted on the insert 24 so that the projection 26 canibe deflected on insertion of the insert "24 and 'will return'to its'original 1 position as 'it mates with a socket 33.
  • a diverging throat fan housing comprising: a frame having a shell with an inner surface, said inner surface being a first lockingsurface, and an insert having a diverging innersurface and an outer surface flush with said 'first lockingsurfaceof said shell, said diverging innersurface of said insert defin- -ing the periphery'of 'saiddiver'ging. throat,- said insert including a" finger along said outer surface of said insert, saidsfinger being formed by two side cuts into said outer surface of said insert and an nmdercut area beneath said finger, the outer surface of said finger being a second locking surface, f a projection extending from one of said locking surfaces, a matching socket in the.
  • said finger may be'defiected by said projection to. permit manual insertionof said insert into said shell and whereby said'socket engages said projection to hold said insert in said frame against axial and angular displacement during operation of said fan.
  • a fan housing comprising: 7
  • a frame having a shell, and.
  • said insert including a finger along said outer surface of said insert, said finger being formed by two side cuts into said outer surface of said insert and an undercut 'areab'eneath, said finger, said finger including a projection extending above the outer surface of said'finger,"
  • fan housingj comprising:
  • said insert including a finger along said outer surface of said insert, said finger beingforrned by two side cuts into said outer surfaceof said insert and an undercut areabeneath said'fingen: a
  • said finger including a projection extending above the outersurface'of said finger
  • said shell including a plurality of axially displaced sockets along its inner wall, one of said sockets engaging said 'tab to hold said insert in said frame against axial and angular displacement during operation of said fan the other of said sockets permitting'adjustment of the axial position of said insert.
  • annular fan housing insert having-a diverging inner surface and a cylindrical outer surface, a resilient finger along said'outer surface, ,said finger being formed by two side cuts into said 'outer surface and an undercut area beneath said finger, whereby the outer surface of said finger is a part'of' said outer surface of said insert, said finger including plurality of'axially' displaced sockets along the outer surface ofsaid'finger.
  • a diverging throatfan-housing comprising:
  • a frame having a peripheral shell and a'front portion a resilient projection extending from one of said locking whereby said resilient projection may be mated with any one of said sockets to provide adjustment of the axial position of said insert and thereby obtain de sired clearance between the periphery of said diverg ing throat and the fan blades of whatever skeleton fan may be assembled in said housing.
  • a diverging throat fan comprising:
  • skeleton fan mounted in said frame and adapted to move air toward said spokes
  • peripheral removable insert having an inner surface whereby said resilient projection may be mated with any one of said sockets to provide adjustment of the axial position of said insert and thereby'obtain desired clearance between the periphery of said diverging throat and the fan blades of said skeleton fan.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US289498A 1963-06-21 1963-06-21 Fan housing Expired - Lifetime US3173605A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US289498A US3173605A (en) 1963-06-21 1963-06-21 Fan housing
GB25112/64A GB1004745A (en) 1963-06-21 1964-06-17 Fan housing
FR978971A FR1399245A (fr) 1963-06-21 1964-06-19 Careter de ventilateur présentant une sortie ou un échappement de forme divergente
DE19641428227 DE1428227A1 (de) 1963-06-21 1964-06-22 Geblaesegehaeuse

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US289498A US3173605A (en) 1963-06-21 1963-06-21 Fan housing

Publications (1)

Publication Number Publication Date
US3173605A true US3173605A (en) 1965-03-16

Family

ID=23111797

Family Applications (1)

Application Number Title Priority Date Filing Date
US289498A Expired - Lifetime US3173605A (en) 1963-06-21 1963-06-21 Fan housing

Country Status (3)

Country Link
US (1) US3173605A (de)
DE (1) DE1428227A1 (de)
GB (1) GB1004745A (de)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3224666A (en) * 1963-04-16 1965-12-21 Svenska Aeroplan Ab Rotary fan arrangement
US3514216A (en) * 1968-03-06 1970-05-26 Borg Warner Coated compressor blades
US3635285A (en) * 1970-05-11 1972-01-18 Gen Motors Corp Cooling fan
US4566852A (en) * 1982-03-15 1986-01-28 Sueddeutsche Kuehlerfabrik Julius Fr. Behr Gmbh & Co. Kg Axial fan arrangement
US5407324A (en) * 1993-12-30 1995-04-18 Compaq Computer Corporation Side-vented axial fan and associated fabrication methods
US6338609B1 (en) * 2000-02-18 2002-01-15 General Electric Company Convex compressor casing
US6471473B1 (en) * 2000-10-17 2002-10-29 Rule Industries, Inc. Marine in bilge blower
US6508630B2 (en) 2001-03-30 2003-01-21 General Electric Company Twisted stator vane
US20070065281A1 (en) * 2005-09-22 2007-03-22 Delta Electronics, Inc. Fan and fan frame thereof
WO2009076126A1 (en) 2007-12-13 2009-06-18 Welch Allyn, Inc. Blood pressure motion sensing
CN1940308B (zh) * 2005-09-30 2011-09-14 台达电子工业股份有限公司 风扇及其扇框
US20120243985A1 (en) * 2011-03-22 2012-09-27 Fujitsu Limited Axial blower
US9568009B2 (en) 2013-03-11 2017-02-14 Rolls-Royce Corporation Gas turbine engine flow path geometry
CN107781224A (zh) * 2016-08-31 2018-03-09 昆山广兴电子有限公司 轴流式风扇
US20180266437A1 (en) * 2017-03-20 2018-09-20 Shop Vac Corporation Fan Having Housing Formed by Connectable Pieces and Including Air Guide Ribs and an Internal Ramp
US10844868B2 (en) 2015-04-15 2020-11-24 Robert Bosch Gmbh Free-tipped axial fan assembly

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2202585B (en) * 1987-03-24 1991-09-04 Holset Engineering Co Improvements in and relating to compressors
FR2928426A1 (fr) * 2008-03-10 2009-09-11 Leroy Somer Moteurs Motoventilateur

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1867809A (en) * 1930-09-09 1932-07-19 Herbert L Chase Propeller assembly for airships
GB441706A (en) * 1934-08-07 1936-01-24 Rene De Mey Improvements in or relating to the suspension arrangements for screw fan rotors
US2100946A (en) * 1934-08-07 1937-11-30 Mey Rene De Suspension arrangement for screw fan rotors
FR975879A (fr) * 1948-12-06 1951-03-12 Const Et D Equipements Mecaniq Perfectionnement dans la construction des cylindres pour turbines à gaz
CH313026A (de) * 1951-12-21 1956-03-15 Power Jets Res & Dev Ltd Turbomaschine
US2763426A (en) * 1952-05-22 1956-09-18 John R Erwin Means for varying the quantity characteristics of supersonic compressors
GB791568A (en) * 1956-03-26 1958-03-05 Gen Motors Corp Improvements in axial flow compressors
US2861829A (en) * 1954-10-23 1958-11-25 Skf Kugellagerfabriken Gmbh Detachable connection arrangement
US2879936A (en) * 1955-12-16 1959-03-31 Westinghouse Electric Corp Elastic fluid apparatus
US2930521A (en) * 1955-08-17 1960-03-29 Gen Motors Corp Gas turbine structure
US2982586A (en) * 1959-08-07 1961-05-02 Francis J Gliebe Fishing net construction
US2994472A (en) * 1958-12-29 1961-08-01 Gen Electric Tip clearance control system for turbomachines
US3042365A (en) * 1957-11-08 1962-07-03 Gen Motors Corp Blade shrouding
US3068016A (en) * 1958-03-31 1962-12-11 Gen Motors Corp High temperature seal

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1867809A (en) * 1930-09-09 1932-07-19 Herbert L Chase Propeller assembly for airships
GB441706A (en) * 1934-08-07 1936-01-24 Rene De Mey Improvements in or relating to the suspension arrangements for screw fan rotors
US2100946A (en) * 1934-08-07 1937-11-30 Mey Rene De Suspension arrangement for screw fan rotors
FR975879A (fr) * 1948-12-06 1951-03-12 Const Et D Equipements Mecaniq Perfectionnement dans la construction des cylindres pour turbines à gaz
CH313026A (de) * 1951-12-21 1956-03-15 Power Jets Res & Dev Ltd Turbomaschine
US2763426A (en) * 1952-05-22 1956-09-18 John R Erwin Means for varying the quantity characteristics of supersonic compressors
US2861829A (en) * 1954-10-23 1958-11-25 Skf Kugellagerfabriken Gmbh Detachable connection arrangement
US2930521A (en) * 1955-08-17 1960-03-29 Gen Motors Corp Gas turbine structure
US2879936A (en) * 1955-12-16 1959-03-31 Westinghouse Electric Corp Elastic fluid apparatus
GB791568A (en) * 1956-03-26 1958-03-05 Gen Motors Corp Improvements in axial flow compressors
US3042365A (en) * 1957-11-08 1962-07-03 Gen Motors Corp Blade shrouding
US3068016A (en) * 1958-03-31 1962-12-11 Gen Motors Corp High temperature seal
US2994472A (en) * 1958-12-29 1961-08-01 Gen Electric Tip clearance control system for turbomachines
US2982586A (en) * 1959-08-07 1961-05-02 Francis J Gliebe Fishing net construction

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3224666A (en) * 1963-04-16 1965-12-21 Svenska Aeroplan Ab Rotary fan arrangement
US3514216A (en) * 1968-03-06 1970-05-26 Borg Warner Coated compressor blades
US3635285A (en) * 1970-05-11 1972-01-18 Gen Motors Corp Cooling fan
US4566852A (en) * 1982-03-15 1986-01-28 Sueddeutsche Kuehlerfabrik Julius Fr. Behr Gmbh & Co. Kg Axial fan arrangement
US5407324A (en) * 1993-12-30 1995-04-18 Compaq Computer Corporation Side-vented axial fan and associated fabrication methods
US6338609B1 (en) * 2000-02-18 2002-01-15 General Electric Company Convex compressor casing
US6471473B1 (en) * 2000-10-17 2002-10-29 Rule Industries, Inc. Marine in bilge blower
US6508630B2 (en) 2001-03-30 2003-01-21 General Electric Company Twisted stator vane
US20070065281A1 (en) * 2005-09-22 2007-03-22 Delta Electronics, Inc. Fan and fan frame thereof
US7416387B2 (en) * 2005-09-22 2008-08-26 Delta Electronics, Inc. Fan and fan frame thereof
CN1940308B (zh) * 2005-09-30 2011-09-14 台达电子工业股份有限公司 风扇及其扇框
WO2009076126A1 (en) 2007-12-13 2009-06-18 Welch Allyn, Inc. Blood pressure motion sensing
US20120243985A1 (en) * 2011-03-22 2012-09-27 Fujitsu Limited Axial blower
US9568009B2 (en) 2013-03-11 2017-02-14 Rolls-Royce Corporation Gas turbine engine flow path geometry
US10844868B2 (en) 2015-04-15 2020-11-24 Robert Bosch Gmbh Free-tipped axial fan assembly
US11499564B2 (en) 2015-04-15 2022-11-15 Robert Bosch Gmbh Free-tipped axial fan assembly
CN107781224A (zh) * 2016-08-31 2018-03-09 昆山广兴电子有限公司 轴流式风扇
US20180266437A1 (en) * 2017-03-20 2018-09-20 Shop Vac Corporation Fan Having Housing Formed by Connectable Pieces and Including Air Guide Ribs and an Internal Ramp
US11359643B2 (en) * 2017-03-20 2022-06-14 Shop Vac Corporation Fan having housing formed by connectable pieces and including air guide ribs and an internal ramp

Also Published As

Publication number Publication date
DE1428227A1 (de) 1969-03-06
GB1004745A (en) 1965-09-15

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