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Publication numberUS3698833 A
Publication typeGrant
Publication dateOct 17, 1972
Filing dateMar 31, 1971
Priority dateMar 31, 1971
Publication numberUS 3698833 A, US 3698833A, US-A-3698833, US3698833 A, US3698833A
InventorsCann Peter L, Duell Richard J
Original AssigneeCarrier Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Centrifugal fan
US 3698833 A
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Description  (OCR text may contain errors)

United States Patent Cann et al.

[4 1 Oct, 17,1972

[ 54] CENTRIFUGAL FAN [72] Inventors: Peter L. Cann; Richard J. Duell,

both of Syracuse, NY.

[73] Assignee: Carrier Corporation, Syracuse, NY.

[22] Filed: March 31, 1971 [21] Appl. No.: 129,717

[52] US. Cl. ..415/20l, 415/204, 417/363 [51] Int. Cl. ..F04d 1/00, F04d 29/40 [58] Field of Search ..415/204, 206, 201, 219 C;

[56] References Cited 7 UNITED STATES PATENTS 3,145,910 8/1964 Jolly 417/363 Harris ..417/3 63 3,161,388 12/1964 Appleton ..417l363 3,401,870 9/1968 Crowe ..417/363 Primary Examiner-Henry F. Raduazo Attorney-Harry G. Martin, Jr. and J. Raymond Curtin 57 ABSTRACT A centrifugal fan assembly including a removable orifice ring having tabs thereon, the ring being formed from the material removed in the production of the side-plate of the fan housing, the diameter of the orilice ring being substantially equal to the diameter of the opening in theside plate of the fan housing, the tabs on the orifice ring being utilized to locate the orifice ring on the side plate of the fan housing.

4 Claims, 5 Dravving Figures PATENTEU BET 17 I973 3.6 98,8 33

5 I INVENTOR.

PETER ANN BY RICHAR ELL ATTORNEY CENTRIFUGAL FAN BACKGROUND OF THE INVENTION Centrifugal fans generally comprise a fan wheel mounted for rotation within a scroll-shaped housing. The housing is provided with circular inlet openings centered with respect to the fan wheel shaft. To improve fan performance, the inlet openings are smaller than the outside diameter of the fan wheel. To assemble the fan, a portion of one side of the fan housing may be removably secured to the housing by bolts or sheet metal screws. Ordinarily, the side of the fan housing is provided with a circular opening slightly larger than the diameter of the fan wheel. An inlet or orifice ring having an outside diameter greater than the diameter of the opening in the housing and an inside diameter equal to the desired inlet opening diameter is placed over the opening in the fan housing and fasteners are inserted through the portion of the orifice ring and the portion of the housing which are in overlapping relationship to attach the orifice ring to the housing. A plurality of fasteners are employed for this purpose. Since the outside diameter of the orifice ring is greater than the diameter of the opening in the side of the fan housing, the orifice ring and the side of the housing must be stamped from separate pieces of sheet metal stock.

SUMMARY OF THE INVENTION This invention relates to a centrifugal fan assembly and a method for manufacturing a fan housing having a scroll-shaped wrapper with first and second side plates secured thereto, the second side plate having a circular opening therein and a plurality of notches communicating with the circular opening. An orifice plate having a central circular opening is provided, the plate being formed by the material removed from the second side plate to provide the circular opening therein, the orifice plate thereby having a diameter substantially equal to the diameter of the circular opening in the second side plate. The orifice plate has tabs formed thereon as a result of the formation of the notches in the second side plate. The tabs are adapted for engagement with the second side plate at a location circumferentially spaced from the notches in the second side plate to position the orifice plate on the second side plate over the circular opening therein.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a fan housing with the orifice plate removed therefrom;

' FIG. 2 is an illustration of an orifice plate for use with the fan housing of FIG. 1;

FIG. 3 is a side view of a fan housing with the orifice plate of FIG. 2 placed thereon;

FIG. 4 is a side view of a centrifugal fan assembly with a portion broken away; and

FIG. 5 is a sectional view taken along line V--V of FIG. 4.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring more particularly to the drawing, there is illustrated a fan housing 3 comprised of a scroll-shaped wrapper 5, a first side plate 7 and a second side plate 9. Side plate 7 is provided with an air inlet opening 8 having a diameter less than the diameter of the fan wheel to be employed in the housing.

Side plate 9 and a,circular orifice plate 11 are provided by blanking orifice plate 11 from side plate 9. Tabs 13 are formed on orifice plate 11 which results in notches 15 being formed in side plate 9. The diameter of opening 17 formed in side plate 9 by the removal of the orifice plate 11 therefrom is therefore substantially equal to the diameter of the orifice plate. An air inlet opening 18 in orifice plate 11 and the air inlet opening 8 in side plate 7 are provided for passage of air into the fan housing.

A plurality of depressions 19, corresponding to the number of tabs formed on orifice plate 11, are formed in side plate 9. The depressions 19 are circumferentially spaced from notches 15 to receive tabs 13 and position orifice plate 11 in the plane of side plate 9.

The side plate 9 is preferably formed by first piercing and forming the air inlet opening, 18. The blank is then notched and pierced to provide the approximate exterior shape of the side plate before depressions 19 are formed therein and the orifice plate 1 l is blanked out.

The circular opening 17 formed in side plate 9 is sized to allow insertion of a fan wheel 23 into the completed housing.

The notches 15 provide openings for insertion of resilient grommets 25 and bolts 27 to mount a fan motor support bracket 29 on the housing and secure the orifice plate within opening 17. The motor support bracket, which is adapted to support and position a fan motor 31 and the fan wheel 23 which is secured to the shaft of the fan motor, is provided with a plurality of arms 37 corresponding to the number of notches in side plate 9.

To mount the motor support bracket and the orifice plate on the fan housing, the resilient grommets, which have an enlarged headed portion 33, a central bore 35 and internally threaded insert 37, are inserted into the notches in the side plate after the orifice plate is positioned thereon with the tabs aligned with depressions 19. The bolts 27 are then inserted through openings in the motor support bracket arms, threaded into the grommets 25 and tightened. This causes the grommets to swell on the inner side of side plate 9 to resiliently secure orifice plate 11 and motor support bracket 29 on side plate 9.

It can be seen from the foregoing that a centrifugal fan assembly is provided which generates a minimum quantity of scrap material in the fabrication thereof and which requires a minimal number of fasteners for assembly. Further, the second side plate including the central opening, depressions and notches and the orifice plate with tabs may be formed by simple stamping operations. Since the notches are adapted to receive the motor support bracket fasteners, further operations to form openings for fasteners are unnecessary.

While we have described a preferred embodiment of our invention, it is to be'understood that the invention is not limited thereto, since it may be embodied within the scope of the following claims.

We claim:

1. A centrifugal fan assembly comprising a housing having a scroll-shaped wrapper,

a first side plate associated with said wrapper,

a second side plate having a circular opening therein disposed opposite said first side plate on said scroll wrapper, said second side plate having a plurality of notches formed therein communicating with the circular opening, I

an orifice plate having a central circular opening therein, said orifice plate comprising material removed from said second side plate to provide the circular opening therein, said orifice plate thereby having a diameter substantially equal to the diameter of the circular opening in said second side plate, said orifice plate having tabs thereon resulting from the formation of the notches in said second side plate, said tabs being adapted for en gagement with said second side plate at a location circumferentially spaced from the notches in said second side plate to position said orifice plate on said second side plate over the circular opening therein, and

a fan wheel having an outer diameter larger than said orifice in said plate and less diameter than the circular opening in said second side plate mounted for rotation within said housing between said side plates.

2. A centrifugal fan assembly according to claim 1 further including support means for rotatably supporting said fan wheel within said housing, and fastening means adapted for cooperation with the notches in said side plate for securing said support means to said second side plate.

3. A centrifugal fan assembly according to claim 2 wherein said fastening means comprise:

a resilient grommet having an enlarged portion on one end thereof,

internally threaded means affixed to the other end of said grommet, said grommet being adapted for insertion through the notches in said second side plate with the other end thereof projecting into said housing, said enlarged portion engaging the outer surface of said orifice plate and said second side plate; and

bolt means adapted for insertion through the center of said grommet for engagement with said threaded means, said bolt being adapted for insertion through said support means into said grommet, subsequent tightening of said bolt causing the diameter of said resilient grommet internally of said housing to expand into engagement with said orifice plate and said second side plate to secure said orifice plate and said support means on said second side plate.

4. A centrifugal fan assembly according to claim 3 wherein said first side plate is provided with an orifice therein for passage of air into said housing.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3775029 *Feb 9, 1972Nov 27, 1973Lau IncDirect driven blower
US3780411 *Oct 19, 1972Dec 25, 1973Case Co J IMethod of making blower housing assembly
US3830595 *Aug 16, 1972Aug 20, 1974Tappan CoMotor mounting support
US3926537 *May 14, 1973Dec 16, 1975Piper JamesAir blower
US4199302 *Jan 19, 1979Apr 22, 1980Goettl Adam DCentrifugal blower having improved structure for mounting of rotor assembly
US4245965 *Jan 25, 1979Jan 20, 1981Master Air Inc.Gas-handling apparatus
US4590964 *Apr 26, 1985May 27, 1986General Motors CorporationNoise isolation for a fuel system
US4598894 *Sep 19, 1984Jul 8, 1986Nixdorf Computer AgFastening system for fastening a device which has two spaced holding flanges
US4599042 *May 18, 1984Jul 8, 1986Coolair Corporation Pte., Ltd.Fan casing volute
US4867640 *Jul 22, 1987Sep 19, 1989Broan Manufacturing Co., Inc.Exhaust fan for bathrooms and the like
US4884946 *Oct 31, 1988Dec 5, 1989Belanger, Inc.Blower housing construction
US5052888 *Jul 11, 1990Oct 1, 1991Ibm CorporationDC motor driven centrifugal fan
US6802770Dec 3, 2002Oct 12, 2004Broan-Nutone LlcVentilating exhaust fan
US6979169Nov 21, 2003Dec 27, 2005Broan-Nutone LlcModular ventilating exhaust fan assembly and method
US7128303Apr 2, 2004Oct 31, 2006Broan-Nu Tone LlcFan mounting spacer assembly
US7203416Nov 21, 2003Apr 10, 2007Broan-Nutone LlcVentilating and heating apparatus with heater shielded by tapered discharge duct
US7455500Dec 6, 2005Nov 25, 2008Broan-Nu Tone LlcModular ventilating exhaust fan assembly and method
Classifications
U.S. Classification415/201, 417/363, 415/206, 415/204
International ClassificationF04D29/60, F04D29/62
Cooperative ClassificationF04D29/626
European ClassificationF04D29/62C2