US1377400A - Blower - Google Patents

Description

H. c. coPPus. Y ILowER. Y APPLICATION FILED' APR. 16, 1915.1

Patented May 10, 1921.

" ffm N.

UNITED STATES PATENT formes. 'N

FRANS H. C. COPPUS, F WORCESTER, MASSACHUSETTS, ASSIGNOR TO COPPUS ENGI- NEERING AND EQUIPMENT COMPANY, 0F WORCESTER, MASSACHUSETTS, A COR' PORATION OF MASSACHUSETTS.

BLOWER.

To all whom t may concern.'

Be it known that I, FRANS H. C. CorrUs,

' a citizen of the United States, residing at Worcester, in the county of Worcester and Commonwealth of Massachusetts, have invented a new and useful Improvement 1n BloWers, of which the following, together with the accompanying drawings, is a speclfication.

i'lhe present invention relates to-blowers, of the type ordinarily used for creating an artificial draft in the ash pit of a boiler or the like, or foriventilating purposes.

The invention is chieiiy concerned with an improved means for varying the quantity of air or other gas handled by the blower, without resorting to a regulation of the speedl of the blower, or to the use of a damper in the casing or conduit through which the air or gas is forced. i

In instances where a blower of the type above set forth is driven by an electric motor, changes in the speed of the blower,

which must, in order to be effective, cover a.

wide range, requiretheuse of a very expensive motor, and involve regulation of the same by a rheostat: the 'latter of course, consumes a large amount of power. In case the blower is of the pulley or gear 4driven run at a certain definite speed in-order to' obtain the full benefit from the power consumed. The use of a damper in the casing or conduit of the blower is equally wasteful of power, since the partial closure of the outlet from said casingrequires a large ex- Y penditure of power to force the air therethrough. j 1

My invention aims toovercome the difiiculties above enumerated, by the provision of means whereby the 'varying demands made upon a blower for a greater or less supply of air can be regulated without vchangingjits yspeed or without changingjthe area of the blower casing or conduit; I have illustrated the same in the accompanying drawings in which the single figure is a sectional view of a blower constructed 1n accordance with my inventlon.

Like reference characters and figures refer to similar parts in the different views.

In the drawings I have illustrated a m'otor 1 as the driving means for the blower; it is lapparent however that any other primev mover for driving the blower maybe employed. The casing 2 of the motor 1 is eX- tended forwardly into the mouth of the.

threaded upon the extreme outer end of the4 shaft. The flange 7 is provided with a polygonal rim 10 spaced `from and surrounding the hub 8 thereof, and in the present instance having siX symmetrical sides, to correspond to the number of blades in the fan. It lis apparent ythat when a fan having a greater or less number of blades is employed, the shape of the rim 10 is made to correspond therewith.

Each blade 11 of the fan has at its base a journal 12 which passes centrally through the corresponding side of the rim 10 and vis reduced at its end to enter a concentric hole in the hub 8. A' ball bearing 13 is provided for each journal 12 between `the inner surface of the corresponding side of rim 10,

' and a bevelpinion 14 keyed or pinned to the journal near its end. These ball bearings 13 take up the .load which is put upon the blades by the centrifugal force produced by y therotation 'of the blower structure.

The shaft 5 has loosely journaled thereon a bevel gear 15 which mesheswith each of the bevel pinions '14 carried by the journals 12 of the blades 11: The hub 1G of said gear 415 is elongated in the direction of the motor 1 and carries the inner raceway member of the ball bearing 4. which is held against a shoulderel? thereon, by a nut 18. In the specmeation of :Letters Patent. Patented May 10, 1921 .Application iilerl April 16, 1915. Serial No. 21,907.

construction shown, the bevel gear 15 and its hub 16 is received upon the shaft 5 between Y the inner end of hub 8, and a shoulder 1 9, the diameter of the shaft 5, inwardly of said shoulder, being such that the periphery of' the same is flush-with the periphery of hub 16.

A helical cam slot formed atthe inner end of hub 16 receives a" pin 21 projecting inwardly from a sliding sleeve 22, having a spline connection23-with thei'enlarged section of the shaft 5 and projecting over the Hush surface of the hub 16.

vThe sleeve 22 has an annulargroove, in

which a ring 24 rides loosely, said ring hav ring diametrically opposite trunnions 25 over each of which fits the bifurcated end 26 of the side of a forked lever 27. The lever 27 "extends through a slot 28 in thecasing 2,

and is pivoted at 29 upon a housing 30 which extends over and closes the slot 28. j The other end of lever 27 in the construction shown carries a swiveled member 31, in threaded engagement with an adjusting screw 32. By turning the hand wheel 33 of said screw, the pin 21 is moved backward 4and forward, to rotate' the bevel gear 15 upon the shaft 5 and thereby change the pitch of the blades 11`of the fan. 4An annular plate 34 may be bolted or otherwise secured upon the end of casing 2, thereby inclosing a chamber adapted t0 contain a supply of lubricant for the ball bearing 4,

i blower should bear a fixed relation to the rate of combustion required to keep the steam pressure within the boiler constant,

for the varying demands made upon thesame.

Under these circumstances it is desirable rvto control the action of the blower in response to thefluctuations in the steam pressure, as for instance, by making the sleeve 22 responsive in its movement to variations of pressure in such a blower.

It will thus be seen that I have provided a blower adapted to be controlled either by hand kor by an automatic regulator; when a greater quantity of air is required, the

I movement of the sleeve 22 to the right by either of i the instrumentalities above described, causes the blades -11 to have a greater pitch according to the distance through which the sleeve is moved. This producesv the desired result without increasing the speed of rotation ofthe fan. Gbviously,

. in this connection alone.

movement ofthe sleeve in the other direction causes .the blades to handle a smaller quan/'- tity of air.

Although I have described the blower con stituting my' invention in connection with the forced draft system of a furnace, it is obvious that the advantages to be derived therefrom are not limited to its employment It willy be clear that a blower ofthe type described is peculiarly adaptable for use in Ventilating systems, wherein it is oftentimes highly desirable to vary the quantity of air handled by the blower.

speed of the motor or other prime mover to drive the blower; the adjustment of the said fan, a sleeve attached to the endv of said shaft, a radial flange carried by said sleeve, a rim carried by said flange concentric Awith said sleeve, and alined journal bearings for the blades of said fan in said In such instances it is usually impracticable and inconvenient to vary the sleeve and in said concentric `rim respec- A* tively. 2. In `an apparatus of thecharacter set forth, a driving shaft, a sleeve attachedto the end of said shaft, a radial flange carried by said sleeve, a rim carried by said flange concentric with said sleeve, a rotatable fan having its blades journaled in bearingsin said sleeve and said rim, bevel gears carried by` said blades, and ball bearings between said bevel gears and said rim to secure the radial thrustV on said blades.

3. In anfapparatus o'f the character set forth, a casing, a driving shaft journaled in said casing and projecting-beyondthe casing, a sleeve attached to the projecting end of saidshaft, a fan carried by said sleeve, bevel gears 'carried by the'blades of said fan, a sleeve rotatable on said shaft, a bevel gear carried by said rotatable sleeve, and an annular plate attached to said casing and holding the bevel gear on said rotatable sleeve in mesh with the bevel gears on said fan blades.

Dated this thirteenth day of April, 1915.

FRANS H. C. COPPUS. Witnessesz PENELOPE COMBERBACH, GERTRUDE MCGRATH.

Images