US2201867A - Centrifugal fan casing - Google Patents

Centrifugal fan casing Download PDF

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Publication number
US2201867A
US2201867A US215643A US21564338A US2201867A US 2201867 A US2201867 A US 2201867A US 215643 A US215643 A US 215643A US 21564338 A US21564338 A US 21564338A US 2201867 A US2201867 A US 2201867A
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United States
Prior art keywords
fan
casing
walls
centrifugal fan
fan casing
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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
US215643A
Inventor
Kenton D Mcmahan
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General Electric Co
Original Assignee
General Electric Co
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Filing date
Publication date
Application filed by General Electric Co filed Critical General Electric Co
Priority to US215643A priority Critical patent/US2201867A/en
Application granted granted Critical
Publication of US2201867A publication Critical patent/US2201867A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/4206—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for elastic fluid pumps
    • F04D29/4226—Fan casings
    • F04D29/4246—Fan casings comprising more than one outlet
    • 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
    • Y10S415/904—Tool drive turbine, e.g. dental drill

Definitions

  • the presentl invention relates to centrifugal fan casings of the type having a plurality of outlets, and to portable electric tools equipped with such casings for motor Ventilating and cooling purposes.
  • the object of my invention is to provide an improved construction and arrangement in fan casings of this type and in portable electric tools equipped with such casings, and for a consideration of What I believe to be novel and my invention, attention is directed to the accompanying description and the lclaim appended thereto.
  • Figure 1 is a side elevation of a portable electric motor driven tool having fan casing embodying my invention
  • liig. 2 is a sectional view taken on line 2-2 of Fig. 1
  • Fig. 3 is a sectional view taken on line 3-3 of Fig. 2.
  • a portable electric motor driven tool comprising an electric motor I having a handle 2 at one end and a driving head 3 at the other end.
  • the driving head is equipped with a suitable chuck I for holding drills and the like.
  • the driving connection between the motor and the chuck is carried within the head 3.
  • the fan has an inlet 1 at the center. Upon rotation, air is drawn into the motor casing through inlet openings 8 and through the motor casing to the fan inlet 1. The air is discharged from the fan to a casing which has end walls comprising the end wall 9 of the driving head 3 and the end frame I0 of the motor and which has peripheral wallsy comprising an. intermediate member II which is clamped therebetween. As shown in Fig. 2, the member II is of substantially square section.
  • -It has an inwardly extending flange I2 provided with a circular opening I3 which fits over and is seated on a circular'boss Il on the wall 9 of the driving head 3 so that the flange I2 is substantially flush with the wall 3.
  • integral with and extending along ther edges of a fiange are walls I5 which project axially therefrom over the fan and bridge the space between the driving head 3 and the motor to provide the outer periphery of the fan casing.;
  • the inner ends of the walls I5 terminate in cutoffs I6.
  • the front faces I1 of the Walls I5 extend from the cutoifs to the outside of the casing and serve to direct air from the fan to discharge outlets I8 arranged in the corners of the fan casing.
  • the inner surfaces I9 of the 5 walls I5 extend spirally beyond the cutoff in the f direction of rotation of the fan and overlap the faces I1 of the succeeding walls I5 to define the other sides of the discharge outlets.
  • the inner surfaces I9 diverge from the periphery of the 10 fan and provide passages increasing in area. from the cutoff around the fan toward the outlets.
  • the discharge passages for the fan are provided by spirally arranged walls having their inner ends terminat-J 15 ing in cutois I6 and extending therefrom along the sides of the fan casing in the direction of rotation of the fan and having the other ends overlapping the succeeding walls to provide the discharge outlets.
  • the front faces I1 of the 20 walls are also spirally arranged, providing a gradual increase in area of the discharge passages and a gradual change in direction of the discharge of air.

Description

May 2l, 1940. K.D. MCMAHAN CENTRIFUGAL FAN CASING Filed June 24, 1958 w m O m H Inventor z mw 8 M MJ. D@ *WW e# K@ Patented May 21, 1940 PATENT OFFICE 2,201,867 CENTRIFUGAL FAN CASING Kenton D. McMahan, Schenectady, N. Y., assignor to General Electric Company, a corporation of New York Application June 24, 1938, Serial No. 215,643
1 Claim.
The presentl invention relates to centrifugal fan casings of the type having a plurality of outlets, and to portable electric tools equipped with such casings for motor Ventilating and cooling purposes.
The object of my invention is to provide an improved construction and arrangement in fan casings of this type and in portable electric tools equipped with such casings, and for a consideration of What I believe to be novel and my invention, attention is directed to the accompanying description and the lclaim appended thereto.
In the accompanying drawing, Figure 1 is a side elevation of a portable electric motor driven tool having fan casing embodying my invention; liig. 2 is a sectional view taken on line 2-2 of Fig. 1, and Fig. 3 is a sectional view taken on line 3-3 of Fig. 2.
Referring to the drawing, there is shown a portable electric motor driven tool comprising an electric motor I having a handle 2 at one end and a driving head 3 at the other end. The driving head is equipped with a suitable chuck I for holding drills and the like. The driving connection between the motor and the chuck is carried within the head 3.
Between the driving head 3 and the electric motor is a bladed centrifugal fan 5 keyed to the motor shaft 6. The fan has an inlet 1 at the center. Upon rotation, air is drawn into the motor casing through inlet openings 8 and through the motor casing to the fan inlet 1. The air is discharged from the fan to a casing which has end walls comprising the end wall 9 of the driving head 3 and the end frame I0 of the motor and which has peripheral wallsy comprising an. intermediate member II which is clamped therebetween. As shown in Fig. 2, the member II is of substantially square section. -It has an inwardly extending flange I2 provided with a circular opening I3 which fits over and is seated on a circular'boss Il on the wall 9 of the driving head 3 so that the flange I2 is substantially flush with the wall 3. Integral with and extending along ther edges of a fiange are walls I5 which project axially therefrom over the fan and bridge the space between the driving head 3 and the motor to provide the outer periphery of the fan casing.; The inner ends of the walls I5 terminate in cutoffs I6. The front faces I1 of the Walls I5 extend from the cutoifs to the outside of the casing and serve to direct air from the fan to discharge outlets I8 arranged in the corners of the fan casing. The inner surfaces I9 of the 5 walls I5 extend spirally beyond the cutoff in the f direction of rotation of the fan and overlap the faces I1 of the succeeding walls I5 to define the other sides of the discharge outlets. The inner surfaces I9 diverge from the periphery of the 10 fan and provide passages increasing in area. from the cutoff around the fan toward the outlets.
From one aspect, it is seen that the discharge passages for the fan are provided by spirally arranged walls having their inner ends terminat-J 15 ing in cutois I6 and extending therefrom along the sides of the fan casing in the direction of rotation of the fan and having the other ends overlapping the succeeding walls to provide the discharge outlets. The front faces I1 of the 20 walls are also spirally arranged, providing a gradual increase in area of the discharge passages and a gradual change in direction of the discharge of air. Due to the shape of the discharge passages it is substantially impossible to damage 25 in front of the cutois as regards the direction of rotation of the fanA and terminating at the outer surface of the casing for directing air to the ad- 40 jacent outlets, and walls extending from the cutois beyond the cutoffs as regards the direction of rotation of the fan and diverging from said first walls and terminating at the outer surface of the casing providing passages increasing in area in the direction of rotation toward the succeeding outlets.
KENTON D. McMAHAN.
US215643A 1938-06-24 1938-06-24 Centrifugal fan casing Expired - Lifetime US2201867A (en)

Priority Applications (1)

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US215643A US2201867A (en) 1938-06-24 1938-06-24 Centrifugal fan casing

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US215643A US2201867A (en) 1938-06-24 1938-06-24 Centrifugal fan casing

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US2201867A true US2201867A (en) 1940-05-21

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2439933A (en) * 1943-07-28 1948-04-20 Westinghouse Electric Corp Centrifugal blower
US2778563A (en) * 1953-03-16 1957-01-22 Doyle Vacuum Cleaner Co Vacuum and blower producer
US3638594A (en) * 1970-03-10 1972-02-01 Merrow Machine Co Sewing machine cooling system
US4065233A (en) * 1974-07-16 1977-12-27 Matsushita Electric Industrial Co., Ltd. Electric blower assembly having volute passages to direct air into motor housing
US4082478A (en) * 1976-07-02 1978-04-04 Whirlpool Corporation Vacuum cleaner fan
JP2012112336A (en) * 2010-11-26 2012-06-14 Minebea Co Ltd Centrifugal fan
US20120152504A1 (en) * 2010-12-20 2012-06-21 Hilti Aktiengesellschaft Handheld power tool with air-guiding element

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2439933A (en) * 1943-07-28 1948-04-20 Westinghouse Electric Corp Centrifugal blower
US2778563A (en) * 1953-03-16 1957-01-22 Doyle Vacuum Cleaner Co Vacuum and blower producer
US3638594A (en) * 1970-03-10 1972-02-01 Merrow Machine Co Sewing machine cooling system
US4065233A (en) * 1974-07-16 1977-12-27 Matsushita Electric Industrial Co., Ltd. Electric blower assembly having volute passages to direct air into motor housing
US4082478A (en) * 1976-07-02 1978-04-04 Whirlpool Corporation Vacuum cleaner fan
JP2012112336A (en) * 2010-11-26 2012-06-14 Minebea Co Ltd Centrifugal fan
US9039361B2 (en) 2010-11-26 2015-05-26 Minebea Co., Ltd. Centrifugal fan
US20120152504A1 (en) * 2010-12-20 2012-06-21 Hilti Aktiengesellschaft Handheld power tool with air-guiding element

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