US1053154A - Centrifugal fan. - Google Patents

Description

o. G. CAMPBELL 1 M. 1551113110011.

CBNTRIFUGAL FAN.

APPLIATION FILED FEB. 20, 1912.

1,053, 1 54. Patented Feb', 18, 1913.

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CHARLES G. CAMPBELL AND MONROE BENBROOK, MILWAUKEE, WISCONSIN, ASSIGNORS TO CREAMERY PACKAGE MANUFACTURING COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

CENTRIFUGAL FAN.

Specicationof Letters Patent.

Patented Feb. 18, 1913.

To all whom t may concern:

Be it known that we, CHARLES G. CAMP- BELL and MONROE BENBRooK, both vcitizens of the United States, and residents of Milwaukee, in the county of Milwaukee and State of Wisconsin, have' invented certain new and useful Improvements in Centrifugal Fans; and we do hereby declare that the following is a full, clear, and exact description thereof.

Our invention refers to centrifugal fans wherein air is introduced axially and discharged peripherally of the fan-casing through the action of any type of fan therein, the object of the invention being to produce a centrifugal fan which will operate with the least expenditure of power in ratio to the resistance to be overcome, said fan being particularly adapted for use in the production of a vacuum.

Heretofore as far as we are laware the inrush of air at the fan axisl is met with an abrupt face that offers great frictional resistance incidental to change of the direction of the air from the axial point to the shedding point of the blades, the said frictional resistance causing back pressure resulting in material loss of power and efficiency, this being especially so in connection with vacuum producing fans.

Our invention contemplates overcoming the above objectionable features of fans of this character by the employment of a conicall deector which is disposed axially of the fan opposite the air intake of the casing. By the interposition of this cone it is apparent that the change of the directionv of air on entering the fan-casing is eifected with the least resistance, the same being spreader deflected radially'into a thin sheet that is evenly distributed to the blades,

- Thus accumulation of aircurrent at the axis of the fan is eliminated whereby greater efciency and reduction in power expended is the result.

Another object of the invention is to pro- Vide means for adjusting the area of. the

air intake opening of the fan whereby the volume of air is correctly proportioned relative'to the speed and capacity of the fan.

Our present` invention is designed to be used particularly in connect-ion with vacuum creating apparatus such as disclosed in our application for patent, Serial Number 682362, liled March 8, 1912. i

With the above objects in view the invention consists in certain peculiarities of construction and combination of parts as hereinafter more fully set forth with reference to the accompanying drawings and subsequently claimed.

In the drawings Figure 1 represents a longitudinal sectional view of a fan embodying the features of our invention, the section being indicatedby line 1-1 of Fig.

2; Fig. 2, a face View of the same with parts' broken away Aand parts in section to more clearly illustrate the details of construction; Fig. 3 illustrates another form of cone from that shown in Figs. l and 2, .wherein the face of the cone is serrated; Fig. 4, a diagrammatic View upon a small scale of an.

other form of our invention applied to a centrifugal fan, and Fig. 5, a similar view of still another form of our invention.

Referring by characters to the drawings, v

l represents a fan-casing of the snail-shell type having the usual eccentric circular air intake 2, and a peripheral air discharge opening 3, the same being tangentially disposed with relation to the circumference of the casing. A driving shaft 4 is axially alined with the intake opening 2 and is jour-Y naled in a bearing bracket 5 of any desired type. As shown 1n Figs. 1 and 2, this shaft projects into the casing, and has secured thereto a conical deector 6, the point of which is disposed opposite the casing intake opening.- The conical deiector in this instance constitutes a hub to which is attached a backing-plate 7 that carries the usual series of vanes or blades 8. The front edges of the blades are suitably Aconnected to a" disk 9,

which disk in conjunction with the backingplate forms a housing for said'blades, it being understood that the disk is centrally apertured to form a receiving opening delecto'r, lwhereby the air passage 1s re- :whereby communication is established vbel stricted or increased as the case may require,

- said tubular throat being held in its adjusted position by a lock-nut 11, which impinges against the outer face of the air intake 2 of the casing.

From the foregoing description it is apparent that when air is admitted through the throat or air intake opening that it will strike the point of the cone and thus be dis-V dered free-to receive a greater volume of air,

and hence when said fan is utilized as either a vacuum producer or blower, the vacuum efficiency is increased while the force expended is proportionately reduced.

In some instances, as shown in Fig. 3, we may provide the face of the conical deflector with serrations 12, whereby greater surface area is presented and the air is more readily broken up into spray form whereby'a series j of thin even sheets of air are distributed to the fan blade as it strikes said face, itbeing understood however, that while we have shown the serrations disposed radially that they may be in spiral or any other suitable form desired to produce the result.

" Fig. 4 illustrates a form of the invention wherein the conical vdeflector 6 is connected to the fan-casing and is therefore non-rotary, the fan A in this instance being revolved about thev conical delector.

Fig. 5 illustrates another form o f the invention wherein the backing-plate 7 of the fan B is formed in one piece-with the conical,-

deiector 6 it being understood that the fan-casing 1n either the form shown in Fig.

4 or 5 isV p ractically of the same type as that illustrated in Figs. 1 and 2.

In connection with describing our invention we have illustrated and specifically mentioned a conical deflector provided with a concaved circular surfaceagainst which the intake air contacts. It should be understood however, in some instances, we may, without departing'from the spirit of our in vention, use a polygonal. form for the deflector surface.-

We claim:

1. In a centrifugal fan having a casing provided with an air intake and peripheral discharge, and a fan mounted within the casing in axial alinement with vthe air intake; the combination of a conical deflector arranged opposite the'air intake, and means for adjusting the air intake opening relative to said conical deiector.

2. A centrifugal fan comprising a casing provided with an air intake and peripheral discharge, a fan mounted within thecasing, and a sleeve in connection with the air intake adjustable toward and from the back of the fan to increase or restrict the aforesaid intake opening.

3. Inacentrifugal fan; the combination of a casing provided with an air intake openingand peripheral discharge, a fan mountedA within the casing in axial alinement with the air intake, and aA conical deflector carried by said fan, a. sleeve mounted within the casing air intake opening, and means for adjusting said sleeverelative to the face of the conical deiector for increasing or restricting the aforesaid intake opening.

4. In a `centrifugal fan having a casing provided with an air intake and peripheral discharge, a fan mounted'within the casing in axial a'linement with the air intake, and a conical deiiector carried by said fan; the

combination of a sleeve in threaded union C. G. CAMPBELL. MONROE BENBROOK.

the foregoing Witnesses: GEO. W. YOUNG, M. E. DowNEY.

with the fan casing'- intake opening, theA .mouth of the sleeve being in axial allnem'ent

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