US956781A - Rotary fan. - Google Patents

Description

J. R. ROBINSON.

ROTARY FAN.

APPLIUATION FILED MAR. 2s, 1909.

956,781 O Patented May 3, 1910.

2 SHEETS-SHEET 1.

` y f l O l J. R. ROBINSON.l

ROTARY FAN.

APPLICATION HLED MAB.23,1909.

Patented May 3, 1910.

2 SHEETS-SHEET 2.

,F l oo o o o o o o o o o o o o o o `e .o o o o o o o o o o o elo o o o o o M o o .o o o o w o O O O .mu o, o O O Inv O RUIM 1%N1O O .o o Q ,o o ..0.0 O Q o o ooooo o G .k Nl .Q O o NN, @L o o O o 5 o .u n@ \N\ o o o o o 5 periphery of the fan are also extended out intake opening of ,the rotorV and are there size or to'details ofconsjtruction,

4 5 Referring-Ito the drawings there is shown a 1 shaft 1' mounted `in -j journal @bearings 2l Qinounti-ng' for the shaftshown in the' drawain maylbe'chaned as' desired.` It is to be' e shaft 'is to be supplied vvision plate or web intermediate'v of the from-a consideration of. the following'def the' drawingsz-e-Flgure-'l 1s a perspecftive' view of the rotor 'detached from .the '40 easing.'v Fig. 2 is a eentral'seetion through vthe' rotor andcasing onel lai-ger scale than shown in Fig.'1.Y

'apart-ly in 'section -an understood' that t UNrrED STATES r-ATENT OFFICE.

JAMES REED aomNsoN, or MOUNT LEBANON, PENNSYLVANIA.

ROTARY FAN.

Application ined March 2s,

To all whom 'it may :Be it known that I, JAMES REED ROBIN- soN, a citizen of the United States, residing at Mount Lebanon, in the'county of Allegheny and State of Pennsylvania, have invented a new apd .useful Rotary Fan, of which the following isa specification.

This invention has 'reference to improvements in rotary fans and is an improvement upon the fans shown in Letters -Patent No.' 866,887, granted to me on September 24th, 1907, for improvements in rotary fans, and fin Letters Patent No. 673,47 7 granted to me on May 7, 1901, for improvements in fans.

In accordance with the presentinvention the fan rotor is made double, that is the air is drawn in at each end of the fan and dis' charged' at the periphery, there being a dilength of the fan. The intake'openings to the 'fan are -made by providing the rotor with. a sleeve* which extends out through the ening in the casing, and the main-fan b ades which extend from the hub to the through and-beyond the louter edge of the turned in the-direction'of rotation of thev said rotor'.

The invention will bebest understood-' 'tailed descriptiontaken. in connection with 'the accompan ing drawings'forming a p art ofthis. speci cation, but 1t is tlobev. under- -stood that the .inventionisg by noA mealns confined to the exactform or proportions 'or 3 is an end elevation partly .broken away of the fan and its casing..

pon s' uitable pedestals '3, nt the particular 1n forms no part of the present linvent-ion with la suitable pulle for the applicationof power olf-maybe irectly coupled to an en electric'motonor turbine. ast o nthe shaft is a hub formed oftwo' 4like members'- 4, 4, J'Qinedat their Specication of Letters Patent Patented May 3,1910. 1909. vserial No. 485,184.

bases and havin their apices" remote one from theother.

he faces of the'hub members ma be curved. y Clamped between the bases o the two-members of the'lmb is an annular web 5 extendingl ra'dix 1.ll fl from vthe hub. The rivets whi'c serve to Vsecure the bases of the two mem'berssof the hub to ether' also serveto secure the web 5 to the ub.

Each member 4 of theA hub carries. the inner end of a number of vmain fan-blades (i, the inner edges of these blades beingconnected into the hub membersft by suitable rivets extending through ian es 7` formed on the outer surface 'of the hu section. 'In the drawings four such blades are shown for each hub section and the flanges 7 are d isplaced so that the fan blades lie-tangential toa circle about the diameter of the shaft 7 or'a little larger, and the said fan blades slant slightly as shown.' T-he blades G extend -tovthe periphery of nitivardl therotor and along the web 5 are secured thereto by angles 8 riveted .to the blades and to the said angles.l That portion of the peripheral part of each blade G remote from secure the ring 10 to the blades 6. For a distance coincident-With the width of each.

ringlO the blades are curved ordished as shown atl 12 vand'this .'d1shedf port1on may Vbe Substantially radiales indicated' 1n. the

drawings. Between `the blades'f't-he rings 10 carry a number of peripheral blades 13` 'similar tothe 'dishedv portion 12 of the blades 6 and these short'peripheral blades, are equi-distan'tl disposed between the several main bla es 6. v `Fast on the outer: face of, each -rlng 10 -and'coincident with the .inner periphery of the lring is a sleeve 14 provided with a radial.

flan lberlveted to the corresponding' ring' 10. '4

1 5 by means of which' the-sleeve ma-,v

The 'ends of the blades' 6 'projecting in thedirectionof the axis of the rotor extend 'through and beyond the sleeve 14 and are there curved in 'thedirection of rotation as indicated at 16.l Y-

Surrounding the fan rotor is a casing 17' which may 'be shaped as usual and 1s provided with a disehar e'throat. A n annular' face plate 19 carrie by the casing closes vin the clearance space between the rotor and' the side walls 'of the casing.

ros

When the fan is in operation the forwardly curved projecting ends 16; of the main' fan blades enga e the air and direct it into the interior o the rotor where it is met by the conical hub section and thrown bodily outward to the periphery of the fan rotor and this outward movement of the air is further assisted by the tangential inclination of the fan blades. As soonl as the outmoving body of air reaches the peripheral blades 13 it is caught by the latter and directed into the casing 17 to finally escape -throgh the throat I1 By providing the forwardly curved projecting ends 16 of the fan blades not only areall the advanta es of the construction of thel fan of the a oresaid Letters Patent retained in the fan' structure of the presentl invention, but insteadjof depending on air pressure to supply the vacuum created by the outmovug air column within'the fan rotor the'air is directed into the interior of the fan rotor by the mechanical action of y.the curved blades 16 `upon' the air column.

Experience `has demonstrated -that vthe eiliciency of the fan is markedly increased by the addition of the curved blades 16. Also y Vby extending the intake opening of the fan .and fina'in fan blades extendin tially direct line from the hu of the rotor orifice an rotation, nthe main fan blades at and beyond l rotor well beyond the orice of the casing` the retarding eil'ect of any air currents which may return through" the clearance space of the casing is obviated.

vWhat is claimed 1. In a blast fan, a rotor havin an axiallyextended'intake orifice, a conica hub with `the apex'extending into the-intake orifice,

in a substanto near the .periphery lthereof and from thence continued 1n a forward curve to the periphery, said main blades also extending axia 1y be ond the axially extended intake there curved in the direction of Witnesses z.

the intake'orifice bein cb-extensire with the distance from the hui to the perlphery of the intake orifice.

2. In a blast fan, a rotor havin an axially extended intake orifice, a conica hub with the apex extending into the intake orifice, main fan blades extending in a substantially direct line from the hub of the rotor to near the peripher thereof and from thence c011- tinued in a orward curve to the peri hery, said mainblades also extending axia ly beyond the axiallyl extended intake orifice and there cextensive with the distance from the hub to the periphery of the said intakeoriicersaid blades beyond the intake orifice being curved in the direction ofA rotation, and peripheral Afan blades between the main fan blades. v

' 3. In a blast fan, a rotor having at each end an axially extended intake orifice, a hub stormed of two conical members joined at their bases and having their apices extending into the intake orilice, a central annular web extending radially from the joined bases of the hub members to the periphery of the rotor, main lfan blades extending in a substantially direct line from the hub of the rotor to near the periphery thereof and from thence continued in a forward curve to the periphery and also extending axially from the web to a point beyonditheaxial extension 'of the intake orifice, said axial exten sions of the main fan blades being co-exten sive with the distance from the hub to, the pein the direction of rotation, and peripheral -fan blades'between the main fan blades.V

In testimony that I claim the foregoing as my own, I have hereto aliixed my signatureV in the Apresence of two witnesses.

' JAMES REED'ROBINSON.

. M. ALICE McACo-Ms, FRED. C. GROTE.

Images