US938781A - Mine-ventilator. - Google Patents

Description

M. T. MUDONOUGH. MINE VENTILATOB.

APPLIOATION FILED MAY 5. 1909.

.MI M. M.

z SHEETS-SHEET 1'.

Patented Nov. 2, 1909.

M, T. MODONOUGH.

- MINE VENTILATOR.

ABPLIUATIOH FILED HAY 6, 1909. 938,781

` produce a Fig.- 4 is a diametrical section through the:

tions of tlieparts msnm fr. menoNoUen, or nimm, weer vincriire. A mNn-vENTILA'ron. A

En sinrus riafrnf Specification of Letters Patent.

Application tiled Hay 5, 1909. `Serial No. 494,121.

The primary object of the invention is a fau wheel which the shape and relative position of the blades -Will impart to the fan a maximum degree of volumetric and manometric eiiiciency, while at the saine time maintaining a high mechanical etliciency retnlring a minimum of Power to rotate it.

e invention also has' or its object a simple, durable and eilicient construction of fan wheel designed Ventilating of mines, altho li ap for otherp generally, e sai wheel embodying an inner and outer series of blades so arranged with respectto each other that in the rotation of the fan the blade ci one series will back up the corresponding blade in advance of it in the other series to ractically uniform and continuous iiow o air.v

With these and other objects in view, as will more ullyappear as the description proeeeds, themvention consists in certain constructions, arran ements and combinatat I-shall hereinafter fully describe and claim.

For 7a full understanding of the invention, reference is to be had to the followingdesoription and accompanying drawings in which: A A Figure 1 is a side elevation of my iini proved fan wheel, a conventional housing be# ing shown, partly broken perspective view of a x'tion of on an enlar d scale, portion of wmgFa the blades o. the outer series ig. 3 is a detailor fra enta perspective view of one of the hu s for t e wheel the means for sec g' the h ub to thefinner ends of the radiating ribs or spokes, a portion of one of the same being shown in dotted lines;

wheel and housing and ,'Fig. 5 is `a fra inentary perspectivd view of a. blade of e mnernseries. Y

Corresponding and like parts 'are referred particularl for use in the y licable present embodiment o away; Fi 2-is a 5.

e wheel' emb fand a relatively f otherwise secured at its inner edge to theI 'to in the V:following description and indi- Patented Nov. 2, 1909.

cated in all the views of the accompanying drawings by the same reference characters.

Referring to the drawings the numeral 1 designates the shaft of my improved ventilating fan, said shaft -being journaled in any desired way as in the pillow-blocks, on the up er -end of the standards 2, and being provided at either or both ends with a pulley 3 or other transmission element, connected as by a belt 4 or the like tosome driving part or source of power (not shown). The two laterally spaced hubs .5 of the wheel are, ke ed or otherwise effectively held onthe sha l and are preferably `provided with radially posed arms 6 that are preferably. cast therewith and that project beyendgthe periphery of the hub as best illu trated in F .3. Theradia s okesiorri s'ofthe- 1g *mi P wheel are bolted or o erwise secured at their Y inner ends to these arms as indicated in Fig.

3, and are bolted or otherwise secured at their outer ends to outer circular rims 8 and at intermediate points to inner circular rims 9. Iifi the present instance there are twelve pairs o each other as clearly illustrated in the drawings, although it is to be understood that in invention'is not limited to this number of ri and that an desired number may be empio ed. The blades A of the outer series exten transversely hom one side of the wheel to the oppositeside vand extend 'from the outer circumference of the outer rim to points slightly short of the outer edgesof the inner rims 9. Each blade of the outer series of blades is curved outwardl in `opposite directions asbest illustratedl in curvatureof the opposite faces being .such as y to (produce the highest manometric eiciency an g eii'ect. In the toavoi'd any dra the invention, the sheet steel and-each lade A is formed of odios a main Section 10 that is curved ection to form acurved face for the blade,

v opiosite direction to formthe'oppositely curve Fig; 2, the

l slightly beyond its median line in an outward of the blade. The two sections areheld prop` erlyspa'ced from eachother-at their outer edges by substantially V-shaped metallic 1 2 inte 'therebetween andrivetedthereto :1t-intermediate 'oints in the length oftheblade, and the sai sections riveted or .otherwise secured at their ends to substantially U-shaped or angular brackets 13 that are riveted or otherwise secured to the flanges 14. as best illustrate outer rims 8. As noted the outer ends of the ribs 7 are recessed along their outer edges so as, to provide recesses Within which these brackets 13 fit. Preferably both outer and inner rims are constructed in any desired number of sections, held together by bolts extending through angularl disposed end d'in Fig. 2. V The outer edges of the blades A are secured in any desired wayto the ribs.

Referring to Fig. 5 wherein a blade B for4 the inner set of the blades is illustrated, it will be understood that such blades are also provided with oppositely curving faces that are formed in the present instance by means of two outwardly diverging sections 15 riveted together at their inner edges which fit .Within recesses 16 in the hubs 5, between the ribs 7. The outer edges of these sections 15 are held rigidly together in properly spaced relation by means of substantially V-shaped metallic straps 17 riveted thereto at intermediate points and by brackets 18 VVat their outer corners, said brackets embodying U- shaped body portions that are rivetedto the sections ofthe blades and connecting webs V19 that are' riveted or otherwise secured to 'the inner rims 9.

It will be understood that in the preferred Y arrangement of parts there-are one-half Yas many inner blades as there are Vouter blades, and that theV inner blades are located in planes between the outer blades as clearly illustrated in Fig. 1, so that the currents of air set up by the-revolutions of the outer blades will be followed up by similar eurrents produced by the inner blades andV a substantially continuous'and uniform ilow of air will be produced. For the purpose of illustration only, I have shown as in Fig. 1, the wheel embodied in a housing C which' is formed with a substantially ,tangentially disposed inlet onening 20 for the 4outer series of blades and with centrally disposed eyes 21 at opposite sides for the inner set of blades prlncipally, the casing or housing being also provided with -an outlet tube 22 which is common to both sets of blades and which is designed to lead by a tunnel or the like to the mine'or other place to be ventilated. While I have described the inletY as at 20 and the outlet as at 22, it is obvious that these terms are relative or arbitrary, as

it is clear that the' fan may be d to exhaust air from a mme or other plal Aas welli -tinuous manner,

Vformed with oppositely curved faces,

oas-,1er

as supply fresh air, according to the direction' of rotation'Y of the fan wheel.

While as above stated, my invention is primarily designed for use in supplying mines w1th proper ventilation, and continued' A,

ous currents of pure air so that themen and animalsworking therein will not suffer any inconvenience or inj urlous'eifects consequent upon foul or poisonous air, it is also designed in emergencies such as explosions to exhaust the poisonous air and gases from a mine, and it is to be undeistood that the invention is applicable for Ventilating and other purposes generally where. it is desired to establish air currents. It is also to be understood that ,my invention is not limited to the exact construction and arrangement of parts hereinbefore described and illustrated in the Vaccompanying drawings as various changes may be made in the proportions and con-- structions of the parts without departing from the scope of the invention as defined by the appended claims. f

Y The curvature of the opposite faces of the inner and outer blades not only prevents the dragging effect that would be produced by plane faces, but-avoids to a Vrequisite extent the radial impact of the impulse of air against the middle of the housing, the flow being thereby maintained in a uniformY conthe continuity being largely the result of thel two series of blades, namely an inner series and an outer series, the blades of one series following theV blades of the other series in. such' a manner that the current established will be unbroken and continuous.

Having thus described the invention, Awhat is claimed as new is:

l. A centrifugal fan wheel embodying an outer series of blades, an inner series of blades, and a housing for said -Wheel provided With a side eye leading to the inner series of blades, and with an independent admission opening leading to the outer series of blades.

2. A centrifugal fan wheel, embodying an `outer series of blades, and an inner series'of blades, the said blades of both series beiiilg t e blades of the inner series alternating with the blades of the outer series.V

fIn testimon whereof I aix my signature in presence o two witnesses.4

MARTIN T. ICDOEGUGH. [L s] Witnesses:

J. D. Yummy,-

Fnnnnniox S.

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