US2482519A - Square sided blower - Google Patents

Description

Sept. 20,1949. a. scHwARz SQUARE SIDED BLOWER Filed July 19, 1947 5 Sheets-Sheet 1 EN TOR.

. INV GERALD L- SCHWA RZ.

AYTORIVEYS.

Sept. 20, 1949. 6. L. scHwARz 2,482,519

SQUARE SIDED BLOWER Filed July 19, 1947 1 IN VEN TOR.

' GERALD L-SC HWARZ.

AT TORNEYS :5 Sheets-Sheet 2 Sept. 20, 1949. G. L. SCHWARZ j 2,482,519

SQUARE SIDED BLOWER Filed July 19, 1947 3 Sheets-Sheet 5 E97 INVENTOR.

GERALD L.SCIIWARZ.

JITORNEYS.

Patented Sept. 20, 1949 p Gerald L. Solmara,

signer. to Air' Gontrols- Inc.,

corporation of Ohio .lClevelandf Heights Ohio, as;

Cleveland, Ohio, at

Application July-19; 1947, SerialNo. 762,188-

a Claims. (01. 230-133) This invention. relates to centriiugal fans. or,

blowers, and to driving. arrangements therefor. More particularly, the invention is directed to; the provision of. ablower. which adapted to: installation with equalv facility? with disnhargeaorifice in various. orientations, and with. means. ior mounting a. drive motor thereem whicirmay easily be adapted to. various positions of the: blower.

The. inventionisalso directed tmaiblowerrcasing which is simpleto. fabricate andzmay'be; formed; for various characteristics: such. as pressure and volume of dischargecwithoutthe use of. a. multiplicity of speoialadiesandltfra methodiofclfabrioata ingthecasing; Among the objects, of. the inventionare: to; pro.- vide a more versatile blower and motor assembly and a more flexible. and. economical method or production of blowers than; have been known heretofore.

Referring to the-drawings: Fig. 1 is a perspectiveelevationview of one form. of the invention; 7

Fig. 2 is a .perspeetiveyelevation view takenfrom the opposite directionlf-roms Fig. 1.;

Fig. 3 is a perspective. exploded view'of'thecomponents of the blower casing;

Fig. 4 is a sectional view of: aiorming: dieassembly illustrating. a step in the preierreda method of making the scroll;

Fig. 5 isa'p'erspectiveviewillustrating;- theassembly of thecasingx; v I Fig. 6 isa; partial.- elevationview, with: parts-in section, illustrating; one'formoi motor mounting; and i 1 Fig. '7 is a partial elevationview illustrating a second form of motor mounting;

The present application is a eontinuation in part of my copendingapplication; Serial No.

D-121,849, filed Septemberfr, 1945.

Referring to Figsl. and- 2, a blower. according, to the invention comprises.nectangularaendplates H and l2, whichare :mir-ror imagesrofieachiother; and a scroll l3 extending be ween the-end; plates and welded to them. The end plates are flanged inwardly at" M Ol'lxthY-EBI edges and a part of the fourth edge, the unflanged portion [5 forming part of the outlet of the. blower. The scroll may be ofv any form calculated for the desired characteristics, ordinarily an Archimedean spiraLehd. is formed with inwardly-directed flanges l6' and I1 which are preferably spot-welded to the end plates. The outer end of the spiral engages the flange M at one corner of theend plates to: form oneiside of the outlet. Amarohed cutoff plate l8 formed with flanges. l9 along its straight edges is welddwith one edge against the inner end of the spiral, its other-edge constituting-the.

other. edgeeof .thenlltleti. This; cutoff pie-ta may 7 be proportioned as necessary to secure the desired size of outlet. r

modified in the assembly An impeller 2| ismountedona shaft 22 sup-'- ported in bearing brackets. 23 .all'dllzdi securedlto the end plates If! and 12;. ApulleyZiGf, whichmay be mounted oneither end 0f.the1shaft..22',;pro-.- vides for driving the. impeller: from a. motor 2:13 by means of the motor pulley 213:- and beltv 29..

The end plates are formedlwith. eccentric circular air intake openings. M and 32;. Preferably the end plates are stifiened and the How of; air is improved by roundedinwardly-direoted flanges 33 about the airintake openings-i Holes 34 are formed;- in the. corners of the: end plates except the corner at which. the. air; outlet is located; these holes being;v provided f0lti&%b0j1fi$ or rods 35 with nuts 31 which strengthen-thesissembly and serve as part of the arrangement for mounting the motor 211.

The preferred forms of the end plates; HT and I2, the scroll l3, and the cutoff: plate 18 may: also be seen in Figs. 4 and '5 which illustrate two stages in the assembly of. the blower. These elements may be fabricated inany desiredmanner; however, a feature of. the inventiongis. an-ime proved and economical method of forming; the scroll l3. 7

-In this method, the scrolls is. made from a rectangular sheet of metal of appropriate.size, which is first bent to form. the flanges L5 and H; The flanged sheet is then passed through Bending rolls, one of which is grooved to accommodate. the flanges, to shape it into a portion of a cylinder approximating its final curvature.

The scroll is.- bent to a spirahcurvatureein set ofv dies illustrated in Fig; l. whichmaybemade. of wood. The outer dies 41 and Marge advance-d toward each other, as indicated. by the-arrows in any customary manner. Theinner diesaremade, in three parts, and are either of such length as tofit within the flanges Hi and H. org'rooved'to. receive the flanges; The parts ofthe inner die are two members 33 and 44 with curved faces. and a wedge 55., thelower end. of: wbichis. formed as a section of the desired spiral; ..and which is forced between the members 43! and .44; as; indicated by the arrow, by theactionoi thepress;

After the forming operaticn the scroll. I32- is spot-welded to the end-plates- The: scroll: has sufiicient flexibility that. the: curvature; may be to; accommodate: variationsin design. of the blower within reasonable limits; To attainthedesiredicnrve; atemplate may be used, or selected; points be .laidofli on the end plates. It istherefore: unnecessary to have a: different set of. expensive dies for. each different scroll: fiormulaithatzmay'be Fig-.- ure .5 illustrates; the. scroihweldiedato' end'p'late l2. Addition of the othenen'd! plate; the cutoff: plate, and the: tiezrods. completes: the casing as illustrated in Figs. 1 and 2.

The preferred modes of mounting the drive motor 2'! are illustrated in Figs. 6 and '7. The arrangement illustrated in Fig. 6 provides a very simple and flexible motor mounting which is adaptable to any orientation of the blower casing about the axis of the shaft 22. As illustrated in Fig. 6, the blower is set up for horizontal discharge with the outlet at the lower edge of the casing as in Fig. 2. The motor 27 is supported by a bracket which may be of any form suitable to the particular motor selected and which is adapted to be secured by bolts or cap screws to a mounting plate 52 which isa flat plate of heavy gauge steel. One end of the plate 52 rests against the tie rod 36 and is held in position thereon by two clamps 53 secured to the mounting plate by bolts 54. A thumb screw 56 fitted in a tapped hole in the end of the plate 52 opposite the clamps 53 engages the scroll it or the flange of one end plate, and may be adjusted to obtain the desired tension of the belt 29. A jamb nut 51 on the thumb screw 56 retains it in adjustment.

It will be noted that this mounting is characterized by great simplicity and ease of attachment to the blower. The motor may be mounted in the position as shown when the blower is rotated 90 clockwise from the position shown in Fig. 6. If the blower is rotated 90 counterclockwise the motor may be mounted on either of the other tie rods 36, and if the blower is rotated 180 from the position shown in Fig. 6, the motor may be mounted on the tie rod diagonally opposite the one on which it is shown in Fig. 6. The pulley 26 may be mounted on either end of the shaft 22. The motor 2! may be reversed on the mounting plate ing plate may be clamped at either end of the tie rod for drive of the fan from either end as may be convenient in the particular installation.

Fig. 7 illustrates a modified form of motor mounting in which the plate 52 is clamped in the same manner as in Fig. 6 to a rod 5! parallel to the blower axis and extending from the center of one side of the end plate I I to the end plate 12. The rod 6| may conveniently be a section of pipe flattened and bent down at the ends at 62 and secured by bolts or rivets E3 to the end plates. The thumb screw 56 is fitted in one corner of the plate 52 so as to bear against the in-turned flange of the end plate. Preferably both corners of the plate 52 are tapped so that the thumb screw 55 may be used against either of the flanges i4, depending upon the arrangement of the motor and pulleys. The rod 6| may be mounted on any side of the blower and the end plates may be drilled or punched for mounting the rod on any side.

Fig. 2 illustrates a form of motor mounting plate 1| which is similar in principle to the mounting plate 5|, but is formed with ears 72 drilled to fit over a tie rod 36.

It will be seen that the square form of the end plates results in a blower adapted to mounting conveniently with the outlet in any direction. The construction of the blower is simple, requiring a minimum of special operations and tools, but results in a rigid structure and is inherently adapted to the production of blowers of diiferent characteristics from standard components.

The methods of mounting the drive motor disclosed herein also facilitate the mounting of the blower in any position and with the drive at either end of the impeller shaft.

Although the foregoing description is neces 52 if desired, and the mountmarginal flangesof the sarily of a detailed character, in order that the invention may be completely set forth, it is to be understood that the specific terminology is not intended to be restrictive or confining, and that various rearrangements of parts and modifications of detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

I claim:

1. A blower casing comprising a pair of opposed rectangular end plates flanged on three sides and part of the fourth side, and with flanged air intake openings, the flanges being directed toward the opposing plate and a scroll having inturned flanges lying against and welded to the end plates, the ends of the scroll being disposed against the ends of the marginal flanges 0f the end. plates.

2. A blower casing'comprising a pair of opposed rectangular end plates flanged inwardly on three sides and part of the fourth side, and with air intake openings; a scroll having inturned flanges lying against and welded to the end plates, one end of the scroll being disposed against the end plates. I 3. A blower casing comprising a pair of opposed rectangular end plates flanged on three sides and part of the fourth side, and with flanged air intake openings, the flanges being directed toward the opposing plate; a scroll having inturned flanges lying against and welded to the end plates, the outer end of the scroll being disposed against the marginal flanges of the end plates, and a cutoff plate mounted between the end plates adjacent the inner end of the scroll.

4. A blower casing comprising a pair of opposed rectangular end plates flanged on three sides and part of the fourth side, and with flanged air intake openings, the flanges being directed toward the opposing plate; a scroll having inturned flanges lying against and welded to the end plates, the ends of the scroll being disposed against the marginal flanges of the end plates, and tie rods joining opposed corners of the end plates.

5. a A blower casing comprising a pair of opposed rectangular end plates with marginal flanges, the-flanges beingdirected toward the opposing plate, and a scroll plate extending between the end plates and welded thereto, the scroll plate being in' abutting relation to the flange of each end plate at at least one point. 6. 'A blower casing comprising a pair of opposed rectangular end plateswith marginal flanges, the flanges being directed toward the opposing plate, and a scroll plate, with an inwardly directed flange, extending between the end plates and welded thereto, the scroll plate being in abutting relation to the flange of each end plate at at least one point. 1

GERALD L. SCHWARZ.

REFERENCES CITED UNITED STATES PATENTS Number Name Date 1,584,944 Johnson May 18, 1926 2,268,046 Marker et al. Dec. 30, 1941 FOREIGN PATENTS Number Country Date Netherlands July 15, 1939

Images