US1080763A - Blower. - Google Patents

Description

@E51 Mmm@ @am C. V. KEER.

BLOWER.

APPLICATION FILED 11116.14, 1911.

1,0809763,V Patented 1180.9, 1913.

4 SHBETSSHEET l.

@fm1/@M1 1 [N VENTO/1' C. V. KERR.

BLOWER.

APPLIUATION FILED 11130.14, 1911.

1,080,?63 Patented Dec. 9, i913.

4 SHEETS-SHEET 4.

WTNESSES [NI/ENTOR 'unrTn sTaTs raTnnT ernten.

CHARLES V. KEER, OF WELLSVILLE, NEW YRK, ASSIGNOR T0 MOEYIFN BROS., QF

WELLSVILLE, NEW YORK.

BLOWER.

Patented Dec. 9, 1913.

Application led December 14, 1911. Serial No. 665,785.

To all whom t may concern Y Be it known that l, CHARLES V. linnn, a citizen of the United States, and a resident of Wellsville, New York, have invented certain new and useful Improvements in Blowers, of which the following is a speciication. My invention relates to a blower of the propeller type, specially adaptedvfor supplying air under pressure to furnaces, although it may be use'd for other purposes.

More particularly, my invention comprises two impellers of the disk type arranged to work toward each other and usually mounted on a single shaft, in combination with a suitable delector and a volute casing.

vFurther, the invention consists in spe-v cially shaping the blades of the impellers .to coperate with the other features of the invention to best advantage.

Further, Iprovide a novel form of bearing for the impeller shaft comprising a f stufling box which prevents atomizing and waste of oil supplied to the bearing.

I will now describe my invention in detail with reference to the accompanying drawing which illustrates exemplifying structuresin which the invention is embodied. Figure l is a vertical section of one form of the invention. Fig. 2 is an enlarged sectional view of one of the bearings. Fig. 3 is a vertical section of another form of the invention. Fig. 4 is an enlarged detail of vthe shaft, impellers, and deflect-or. Fig. 5 is an enlarged front view of one of the blades. Fig. 6 is a side view of the same. Fig. 7 is a section of the blade near the tip. Fig. 8 is a section of the blade near the base. Fig. 9 is an end elevation of the form of blower shown inv Fig. l. Fig. 10 is an end elevation of the blower shown in Fig. 3. Fig. 11 is a sectional detail of 'a modilied form of delector shown in proper relation to the shaft and impellers; and Fig. l2 is still another. modiiication of the delector.

Referring first to Figs. l and 9, reference 'character l designates the shaft, carrying impeller hubs 2 on which blades 3 are mounted. ,These blades may be secured inthe mannen fully described in my prior pend- -ing application, Serial #648,584, iiled September 9, 191?, and the blades may also be formed as described in said application and as illustrated in Figs. 5 to 8 inclusive,,in

which it appears that while the blades near the tip have a moderate pitch angle inthe direction of rotation, this angle proportionately increases toward the base as shown in Fig. 8, where the angle is very abrupt, so that at all portions of their length the blades have an impelling capacity suited to their angular velocity at that point. The blades as shown in Figs. 7 and 8 have curved impelling faces and in the preferred form this curvature increases from the tip toward the base of the blade. The important shape of these blades may be graphically described by saying that the blades have curved iIn pelling faces and that the average pitch-r angle of the blades with relation to the plane of rotation increases from the tip toward the base. The average angle may, of course, be indicated by a straight line drawn from one edge of the blade to the other in planes parallel to the planes indicated in Figs. 7 and 8. More particularly, the shape of the blades may be described by saying that they have curved impelling faces, the curvature increasing from the tip toward the base, the average pitch angle also increasing from tip toward the base. This form of blade when the curvatures uniformly increase from tip to base and angle correspondingly increases, may mathematically be described as an increasing helicoidal pitch. This mathematical term, however, is not employed in the claims because the change in curvature and pitch angle may be not absolutely uniform, and, therefore, not exactly in accordance with the mathematical definition, while the blades may still come within the spirit ofthe invention as described by the graphic phrases above. The shaft l is supported in bearings carried by the boxes 4. 5 designates in general the impeller casing, of which the periphery 6, as shown in Fig. 9, is of volute form. he casing terminates at 7 in a discharge opening. The casing is provided at each side adjacent to one of the impellers with a flared'mouth orI supply passage 8. rlhe tips of the ,blades revolve close to the throats 9 of these supply passages. Struts 10 supportbearingboxes il.

Surrounding the shaft, between the two iinpellers, is a deflector designated generally by reference character ll. The form Of this delector may vary greatly. As shown in Fig. l an approved form -onsists of a double conod of which the small v.ends are se.

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cured to the hubs and the large ends meet to ferm an annulus 12 centrally located within the casing. When the shaft is vre` volved at suitable speed, the disk impellers with blades peculiarly shaped, as described in my aforesaid application,take air through theV supplyports 8 and deliver it at high velocity into the casing. The impelled air leaving the inner edges of the blades takes a diagonal path inward, forward y(in the direction of shaft rotation) and outward, and the volute casing effectively accommd' dates the air entering in this manner and efficientlyl converts the kinetic energy 'of the `fluid into static energy or pressure. Th@ defiector 11 serves edectively, by reason of its form and arrangement, to prevent eddy vcurrents which otherwise tend to formwithin the casing.

A blower constructed as 'described will very etliciently develop satisfactory pressure vfor supplying air for combustion lto fur` naces, etc.

In blowers and exhaust 'fans heretofore constructed, it has been found that the entering air and the rapid rotation ofthe shaft tend to atomize oi vin the bearings and to vrapidly dissipate and waste the lubricant.

To prevent this AI provide my'bearing boxes l, as shown 1n F 1g. 2, with stuffing glands'15 v secured vby screws 1G. By means of these stuffing boxes and'packing 17, the shaft beari ings toward the impellers may bc made satisfactorily oil-tight and wastev of oil-may be prevented. The details of the bearingproper 'may vary greatly but the described construction' operatesI satisfactorily in' connectionv .with lring oiling bearings as illustrated.

It has been stated that the form of the delector may be varied greatly. iig. 11 shows a deflector consisting of a-hollow cylinder 30 placed between the impeller hubsI andto this may beadded a central disk 31. The cylin-l der 30 vforms in e'ect an enlargement of the shaft and ltakes up eddy space that would otherwise be present, and the disk -31 also forms a baille which prevents eddy currents. Instead of the conoidal deflector shown in Fig. 1, a delector of double straight conical form, as shown in' Fig. 12, 'may be employed. "Further, the size of the central portions of the dellectors, in any of th'ese forms, and the consequent angle of the cones, or

`other dimensions, may be considerably varicd.

Fig. 3 shows a modification of the blower construction in which an annular throat or nozzle 410 is placed between the casing 5 and the discharge chamber 4:1 adjacent to the deiector. This forni of the blower iseflicient and desirable in some cases.

I claim:

1. In a blower, the combination of a volute casing, a shaft therein, a disk impeller on the shaft, a detlec'tor at the discharge side of the impeller, a bearingfor the shaft at the suction side of the impeller, and a stufling box loss due to fan suction. f

2. In a blower, the combination of a volute on the'shaft arranged to discharge toward each other, and a deiiectorbetween the impellers, bearings for the shaft outside the im-l pellers 'and stalling boxes for the bearings about the shaft to prevent oil loss due to fan suction. y

3. In a blower, the combination of a volute casing, a shaft, two disk impellers on the peller con'iprising a hub and blades, said pitch-angle of the blades with relation to the plane of rotation increasing from the tip toward the base, and a deflector within the casing about the shaft between the iinpcller hubs.

casing, a shaft, two disk form impellers on the shaft, one near each side of the casing, the casing boing provided with opposite inlet openings leading to said impellers, and a double conoidal deflector within the casing and about the shaft between the impellers, the conoid bases adjoining each other centrally within the casing.

5. '.lhe combination of a volute casing, a shaft therethrough, a deilector thereon centei-ed in the casing, the Casin g being provided with annular air inletsione at each side, disk the inlets and working toward the center, the blades of said impellers having curved working faces, vthe curvature of the faces increasing from the tip toward the base and the average pitcheanglc of the blades also increasing from the tip toward the base of the blades. l

(5. In a blower, the combination of a volute casing, a shaft,'disk impellers Comprising a hub and blades, said blades having curved working faces, the curvature of said faces increasing froni the tip toward the base of the blades, the average pitch angle of the blades to the plane of rotation also increasing from thetip toward the base of the blades.

7. In a blower, the combination of a rotatable shaft, a discharge casing of volute form in a plane perpendicular to the shaft, the sides of the casing being provided with circular air inlets concentric with the shaft, two disk impellers on the shaft, one within each of said air inlets, the impellers being arranged todischarge toward each other, and a deflector within the casing between the impellers.

8. In a table shaft, a discharge casing of volute form sides'of the casing being provided with cirfor the bearing about the shaft vto prevent oil casing, a shaft therein, two disk impellers qshaft, one at each side of the casing, each im' bladesI having curved faces, the 'averagey l. In a blower, the combinationof ay volutey blower, the combination of a rotain a plane perpendicular to the shaft, thet impellers on said shaft one withi-n each of iso vculurair inletsr concentric withv the shaft, .charge edges to obtain an increased distWo disk impellers on the shaft, one Witliin charge head, and a' deector Within the cas- 10 ,each of said air inlets, the impellers being ing between .the impellers.

arranged to discharge toward each other,\ CHARLES V. KEER -each impeller comprising a hub Asind blades,

said blades having concaved working faces Witnesses:

of helical pitch,'sa1d pitch increasing at all ALWIN SGHALLER, points of the blade from the inleg; to the clis-A CHAS. O. LIVERMORE.

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