US1046773A - Casing for impellers of rotary blowers. - Google Patents

Description

T. W. GREEN. CASING FOR IMPELLERS OF ROTARY BLOWERS.

APPLICATION FILED MAY 10. 1912.

, Patnted D60. 10, 1912.

) 2 SHEETS-SHEET 1.

jmwmao FM: 3 i 15 4 INVENTOR A TTORNE Y T. W. GREEN. CASING FOR IMPELLERS'OP ROTARY BLOWEBS.

APPLIGATION FILED MAY 10, 1912.

Patented Dec. 10, 1912.

2 SHEETS-SHEET 2.

INVENTOR A TTORNE Y of Philadelphia, Pennsylvania,

To on whom ferred form of my casing ap 1 Fig.1, with a THOKAS W. GREEN,

I casino ron rrrmnnnnrnn, PENNSYLVANIA.

ELLE-BS OF ROTARY BLOWEBS.

concern: Be 1t known that I, Tnoms W. fGnEnN, a citizen of the United States,and a resident vented a certain new and the Impellers of Rotary Blowers, the following is a specification.

The purpose of my invention is to save in weight and thickness of metal economizing of which both in this way and in the cost of machin-- ing the casings for impellers such as are used in blowers, 'exhausters and pumps.

A further purpose of my invention is to substitute rolled sheet or plate material for cast iron in the curved outer casing parts of rotary blowers, exhausters or pumps.

A further purpose of my invention is to enable the manufacturer to finish the outer curved surfaces of the cast ends or heads of blowers, etc, in a lathe, boring mill or other A further purpose of my inclose within an extension of the casing the gearin which keeps the impellers in step and drives one impeller.

Further purposes of myinven'tion will appear from the specification and the claims.

I have preferred to illustratemy invention by one form thereof which I have determined to be light, inexpensiveand efficient, and which well illustrates the principles thereof.

Figure 1 is. a top planview of the prelied to a blower. Fig. 2 is a vertical section 0 the structure of portion of the casing removed. Fig. 3 is an elevation of the structure shown in Figs. 1 and 2, viewed from the pulley end but with the pulley removed. Fig. 4; is a section of the form shown in Fig. 1 taken upon lines H thereof.

;-have heretofore been cast The manufacture of impeller casings, particularly for the larger size blowers that weigh several tons has involved much diiliculty and a great expense. These casings and a large percentage of them has been spoiled in the molding, even when conditions favorable. Frequently the rough castings contain blow holes and other imperfections that are not discovered until a great amount of time and labor has been expended thereon. The great size of the flasks required and the difiicult-y in holding the parts in place during the casting operation, combine to make the foundry work very expensive and trouble- Speeification of Letters Patent. A Application filed Kay 10, 1912. scream. 90,309.

have inuseful Casing for 'not always register accurately.

ave been the mostsome. The of the flask as well as.

the uneven cooling require excessive allowance of material for machinin resulting in a waste of metal which is psi for at foundry prices, including labor, and is sold as Patented Dee.10,1912.

scrap. The finished cast casing is many times uneven in thickness, excessively heavy and bulky and cannot be divided to the best advantage because of the machining required. During the machining and setting up, the casings are frequently strained with the result-that the'impellers and casings do My invention is intended to overcome'all of the 'difiiculties stated and to produce a lighter, stronger and cheaper casing, with which the impellers can more easily be-made to register My invention is shown as applied to a rotary blower of the type having two im eller members, the outer end of the blade 0 each forming a seal with the waist of'the other. Evidently it is applicable also to other forms of blowers and pumps. In the double impeller pumps and blowers the central section, within which the inlet and outlet air connections are made, is preferably straight from side to side in the middle section, as indicated at -1 and 2 of the preferably cast central section 3 which I have shown as secured to the base in any suitable manner. Upon either side of this central section, with the two-impeller construction shown, is located a semi-cylindrical casing or shell, shown at 5 and 6 respectively, corresponding closely in shape to the art of the extreme outer portion of the b ade of the impeller upon that side of the blower or pump. This outer portion of the impeller, in'the form shown, is provided with the packing 7. At the ends the semi-cylindrical side casing parts are :closed by semi-circular heads 9, 9' and 10,

10'. With other multi-blade constructions, the portion of the circumference represented in the semi cylinder and the semi-circle respectively, will differ in accordance with the construction of the machine and will not always represent as much as half of a circle. The application of my invention to these forms will sufficiently tration here shown.

It has been customary to cast the entire outer casing or shell, dividing in various ways as'may he required for the necessary coring and to provide for'the accessibility of the impeller parts from the end thereof.

appear from the illusplate, side walls; and

: head greatly savin is a I g p .at 17, 1s and is 22 and 23 are shown.

I ings for the shafts 27 and 28 and are held.

vided with partition circular ends and 31 for the central end sec- 1,004,776 and here intended to represent conventional impellers.

sin

These cast heavy. 1 v

I have found that the casing may be separated vertically parallel to the impeller axes to advantage, along the edges 11, 12', between the central straig t portion and the semicylindrical side parts; thatthe semi-circular ends upon the same side may be cast separately and covered with semi-c lindrical that the en may be trued-up along'the-faccs thereof which ongage with the central straight part and fastened each to the other so as to be finished upon a boring bar or lathe as one circular in the'expenseof finhave been excessively For-convenience, 'I split the intermediate portion 3 up into four two end plates 13, 14 an the top and bottom frames 15 and'16. Each of. the central end plates preferabl provides bearing for one half of an impe er shaft'upon each side as stiffened at these bearings horizontally by web 19.. andlverti'call flanges 20 and 21 stiffened transversel 20' and 21'. At theto and bottom, flanges he flanges-2Q, 21, 22 and 23 are effective to join the parts to mating flanges upon the se '-circular end plates and the top and bottom central sections by any suitable fastenings, shown at 24. The caps 25, 26 coiiperate upon each end-with the bearing members 17, 18 to complete the bear- 1n place by any suitable means, such as the bolts 29 shown. The ends 9 and 10, as well as the central section 13 at this end, are pro- 'walls 30 for the semitlons, coiiperating to close the interior of the casing at this pomt a inst each other and the impeller shafts. utside of this partition, however, an elong housing is formed by slde walls 32, 33 and end walls 34, 35 parallel vwith the partitions 30 and 31 to inclose and protect the gears 36 by which the impeller shafts are main} tained in uniform rotation and both are imelled by pulley 37. The housing thus ibrmed add tionally stiflens this end of the impeller casing t'owhich the driving pulley is connected and upon which the strain is correspondingly increased.

I have illustrated two impellers 38 and 39 of a type-claimed by me inmy Patent N o.

The portlons of the from the other, repeachimpeller blade outside of the intermediate casing sections, is'in substantial contact with the semi-cylindricalside portions 5 and 6' to whose construction m mvention .as' here illustrated partly appl1es., The semi-circular heads 9 and 9' and 10 and 10 after being travel of each farthest arts comprising the faced on their straight edge portions are clamped together and turned in any suitable manner, as upon a boring mill, to turn off the circumferences 40, 40 41 of the other set at a preferably turning off the all of the semi-circular end operation as the simplest way of insuring the same diameter for each. They may be'bored 'for the .shaft at the same setting. The semiciroular end pieces may then be conveniently clamped respective ends after these flanges have been faced to the desired distance between their outer faces. I then bend metal, suit-ably flanged at their side edges as at 42, temporarily using an internal form between the ends where the separation of the end pieces makes this desirable, and rivetor otherwise fastening :the plate metal to the flanges 43 and 44 at any suitable inter- .vals. The flanged edges 42 are preferably tom intermediate sections. Any desired stiffening'or external suppor may be givento j the semi-cylindrical sheets of metal thus formed by external re-inforcing strips or sections 46 here shown as of T section and ;spaced at any suitable intervals. The sheet metal may ordinarily be secured to the sealmg contact, without the use of high, or where for any other reason leakage is feared or found to exist any kind of packated gear c'over' or 'lng may be inserted to improve or secure the joint or the edge isame purpose. In the assemblage of my device, the central frame parts can be erected and the impellers lifted to place before the semi-cylindrical side pieces are fitted on and before or fafter the top member 15 is placed. These gthe impellers may be removed by removal of the one semi-cylindrical side piece with its end pieces attached and entire lateral withjdrawal of the impeller until it will swing clear of the to piece 15, when it may be lifted outeit er upwardly. or axially. b 1ere the space does not permit this, it can e 1 the half bearing of the middle section and t p lifting of the impeller.

'tional weight and cost of metal otherwise the semi-cylindrical surfaces replaced by plate metal as well as the additional metal which would have to be cast these castings and subsequen boring at large expense.

' It will be evident that I make theinterior 1y removed by of the blower casing much more easily acsheets or plates of secured to the flanges 45 of the top andbotflanges at the ends' with suffi'ciently tight gaskets. Where the intended pressure is relatively ,parts are then readily applied. Either of section 15 removed, permitting free Y It .will be evident that I save the addi-- required for reliable cast iron covering of initially upon.

of one set and 41, single operation circumferences o pieces at' the same 10c may be calked for the fted outjust sufficiently to clear from -,ing{surface.

cessible than haspreviously been the case, greatly'facllitatmg the placing of my blower close to a vwall or other objectionable limitaving thus described my invention, what I claimas new and desire to secure by Letters Patent is 1. In adevlce of the character'stated, a central impeller casing section, semi-circular end pieces attached thereto and a sheet metal covering extending from one semi-circular end piece to the other upon the same side of the blower and means for retaining the parts together.

2. In a device of the character stated, a central impeller casing section carrying partial shaft bearings having the journal openings extending in opposite directions in combination with the side sections therefor secured to the central section and complemental shaft caps cooperating with the bearing blocks.

3. In a device of the character stated, a central impeller casing section, top and bottom parts therefor, semi-circular end side sections supported by the central section and corresponding in semi-circular contour to the path of travel of the outside of the impellers, impellers fitting within the casing and a side cover member fitting the contours of the end side sections and adjoining those upon the same side.

4. Ina device of the character stated, a

central impeller section end, side sections fitting thereto and having curved peripheries fitting in contour the paths of travel of the outside of he impeller-wings used, impellers adapted to be used in the casin and side casing members fitting the curve contours, of the end side sections and secured thereto. I

5. In a device of the character stated, a central section having partial shaft bearings thereon, removable top and bottom parts therefor and semi-cylindrical side sections and means for securing the sections together.

6. In a device of the character stated, central sections provided with side, bottom and top flanges at each end, top and bottom members provided with end flanges cooperating with the flanges of the central sectlon and oppositely facing cylindrical side sections having flanges at each end cooperating with they side flanges of the central section.

7. In a device of the character stated, end members provided with vertically divided bearings, a web connecting adjoining bearing parts, vertically disposed webs supporting the said bearing parts and top, bottom and side members adjoining the ends.

8. In a device of the character stated, a central casing member, semi-circular end side portions secured thereto at opposite ends of the casing and semi-cylindrical side members secured to the semi-circular ends.

9. An impeller casing having separable semi-circular flanged end side members and semi-cylindrical side connecting portions united to the flanges.

v 10. A pair of impellers, shafts therefor, an impeller casing vertically divided longitudinally through the axes of the impeller shafts, and means for uniting the parts at the planes of division.

11. In a device of the character stated, centrally and oppositely disposed side casing members divided alongparallel vertical planes, bearings divided along't-he planes of easing division and vertically disposed flanged supports for said bearings.

i THOMAS IV. GREEN. Witnesses:

HELEN I. KAUFFMAN, GERTRUDE BADER.

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