US1004776A - Rotary blower. - Google Patents

Description

T. W. GREEN.

ROTARY BLOWER.

- APPLIOATION FILED 11.111. 24, 1911.

2 SHEETS-SHEET 1.

. A g y 6 Wai 1 l. I

,Wm 2 2J/ 47 y l 1 j@ '19 W 1@ 'l0/l INV Y ATTORNEY T. W. GREEN.

ROTARY BLOWER.

APPLIUATIQN FILED 111111.24, 1911.

1,004,776. Patented Oct. 3, 1911.

2 SHEETS-SHEET 2.

`MJIIIIIIIIIII f IIIEIIIIIEIE HHH I WITNESSES fTBoM-As'wf. GREEN, onrmrannniiia, PENNSYLVANIA.

ROTARY Btownn.

. Specication of ettersjlatent. i

f Patented. oct. 3,1911.

To all whom it may concemr -Be it known that I, THOMAS W. GREEN, a

citizen of the United States, and a resident of which thev following is a specification.

.of Philadelphia, vPennsylvania, have invent-` ed a certain new and useful Rotary Blower,

My invention relates to blowers and particularly Ato that type or character of blower in which two impellers alternate in position and cooperate to perform the locking or valve functions for each other.

One of the purposes of my invention is to provide plane faces for the lock or seal portions upon each impeller which cooperate with a blade of theother, in order to Vsimplify themachining-ofthese' locks and to provide for adjustment to maintain effective seals with the blades notwithstanding wear,

or variation in the relative angular positions connecting gearing or other parts.

A further purpose of my invention is to provide adjustment of the plane locking portions, preferably into parallel plane positions. .e 1

A further purpose of my invention is to provide reliable quick adjusting means for the plane surfaces involved and to make them capable 0f nice adjustment.

further purpose of my invention is to provide for adjustment of the sealing lock arngularly yvith respect to its length, which I prefer to accomplish by making -the ends of the lock separately adjustable.

A further purpose of my. invention is to equip the ends of impeller blades with sealson ofl it.

lng members which are'made effective in proportion to the pressure used and by rea- `Further-- purposes of my invention and i novel details of construction will appear in the specification and claims hereof.

In the drawings I have selected for illustration an embodiment of my invention whichis highly practical, eiicient and inexpensive, from among the many available forms.

Figures 1 and 2 are transverse vertical sections of the preferred form of my invention,

corresponding to the section at in Fig. 3, but with the impellers in slightly different positions. Fig. 3 is a horizontal section of my invention corresponding to the section at w-Jw in Fig. 1. Figura@ is a relatively enlarged elevation of a part, of the structure Application. nledimarch v24,A 1.9:,12v seriauNo. 616,728.

the structure seen in Fig. 5. irelatively enlarged section of the outer end j o f one of the impellers of Figs. 1 and 2. Fig.

8 is a brokenelevation, showing a modificaytion of one part ofmy invention. Fig. 9 is and outlet opening 5. these'openings is provided with flanges 6 plate. '.Fig. 5 is a section corresponding to line V.a-.z'of Fig. 4 but with the plate in place. Fig. 6' 1s a broken end elevation of Fig. 7 is a a broken section upon line y-y of Fig. 8.

The same reference numerals indicate like parts'l inthe drawings.

In the form illustrated, 1 designates a casyin 'or frame, here called a cylinder, semicy indrical in cross section at the parts 2 and 3 and straight between these parts.

Within this two cooperating impellers lare i placed. The casing is provided with two openings for the gasor liquid which is being ofthe two impellers because of wear to the 'the outlet. Their character is dtrminedby the direction of rotation of the impellers.` With the direction indicated `by the arrowsv pumped, one being the inlet and the other in the ligures, these become inlet opening4 AThe casing about by which suitable piping is attached andthe cylinderis flanged at its ends at 7 for attachment of cylinder heads 8 which carry the bearings 9l for the shafts 10, 11-' upon which the two impellers are mounted. I provide suitable glands 12 for these bearings whenever gas is being pumped and the pressure is sufficient to make leakage therethrough objectionable, and drive one of the impellers by the shaft of the other, in proper time relation thereto, through two equal gears 13 which are held in place by set screws 14 passing through bosses 15 upon the gears. Upon one end of one of the shafts, preferably that end opposite the gearing, I mount any suitable pulley or other driving device 16; so that the bladesof one impeller 17 may be properly driven and timed to pass within the lwaist 18 of the other impeller 19, and vice versa.

For the purpose of assisting in the sealing function between the impellers and coperating parts when handling gases and light liquids, and of making the tightness of the seal correspond in large measure with the 'need therefor by reason of the pressure used,

I may groove the impellers longitudinally at their outer extremitiesas .at 20, and insert therein' sealing.. material of any suitable l a gearing, permits adjustment of any one.or

all of the plane faces to rovide for wear of V `quite satisfactory for the purpose. The cylindrical shape of the sealing material is quite desirable as it results in slight rotation thereof in use, whereas regular polyg- .onal shapes would require withdrawal and reinsertion with the other sides successively exposed to approximate the same distribution of wear about the surface of the sealing material automatically attained'by the 5 circular form. The outward pressure upon the sealing material is made proportionate to the force tending to cause the air or other material to pass it.

The main aims of my invention, in so far as it relates to the sealing parts or faces of the waist of each impeller, are to secure ease and accuracy in the machining of these parts and to make them adjustable. I attain the rst aim by making these parts plane upon their surfaces and further simplify the construction, as well as the laying out of this Work in the shop, by making the plane face upon one side of the impeller which forms part of the surface of one waist lie within the same plane as that face upon the other side of the impeller which forms a part of the opposite side of the other waist. I also make the other two plane waist surfaces cooperating respectively with the two above stated, as parts of another plane at right angles to the plane irst stated.

l The adjustability attains three advantages. It permits the two plane surfaces upon opposite sides of the same waist to be adjusted, one outwardly and' the other inwardly, to compensate for lag or lead of one impeller angularly with respect to the other because of wear of the connecting the faces themselves or o the impellers, and, with independent means'for adjusting the different ends ofthe planes, makes it possible to accommodate the plane faces to the impellers during construction or erection when their faces are not strictly parallel, whether because of strain or whatever other reason. To secure these benefits, I

' form portions 23 of the locks or cut-offs of my impellers as plane surfaoes with which the outer, preferably belled, portions 24 of the blades cooperate. I have found the most desirable arrangement of these to be that in which these planes are radial to limitingedges ofv these plane surfaces with relation to the sealing `l1ne of the portions 24 therewith at the tlme that the impeller ,begins to seal with another of the planel faces. I extend the plane surfaoes toward the center ofthe im eller sufficiently-to have a reasonable lap o these seals, both to insure effective sealing of the one before the seal is released by the other and also to provide for variation of the exact lines at which both seals become effective after wear' of the gearing and angular variation of the relative positions of the impellers take place. While I am providing primarily in my adjustment for the wear in the gearing With corresponding relative angular variation in osition of the two impellers, and for cant- 1ng of the seals to bring' them into parallelism with the cooperating impeller surface, it is evident that wear of any character which might occur between the rotating parts can also be provided for by the same adjustment.

While the exact vcurvature of the impeller blade could be determined experimentally, I prefer to determine the various centers of curvature as follows: From the center of that part of the pitch circle 25 lying Within each blade as at 26, between the points 27 at which the pitch circle cut-s the planes 23,

23', 232 and 233, I 'set ofi' points 28 upon a tangent 29 drawn to the-pitch circle through 'the point 26. These points 27 and 28 are,

therefore, at a distance from 26 correspond- :ing to the chord of one-eighth of the pitch gcircle. I then connect opposite points 27, V28 as indicated. From the points 26 I next draw lines`26-3O which are chords of quarters of the pitch circle. The intersections of these lines-26-30 with the lines 27-28 at 31 and 32 give the centers about which I describe the portions 33 of the blade, using feach of these centers to describe the curve upon that face of the blade farthest from said center. The connecting curves between portions 33 and the plane surfaces are drawn from centers 25 upon the pitch circle midway between 26 and 27. Each center 25 is used for the curve upon the side of the impeller nearer to it. curve forming the end of the impeller between the points 34 at which the curves 33 sodetermined leave the plane cooperating surfaces of the seals 23, 23', etc., giving allowance for suiiicient lap, may vary considerably and is laid out to cooperate with The character ofthe the curvature of the parts of the waist of each impeller between the plane faces, so as to trap as little air as possible therein and to give pro er waist width for the impeller shaft an reasonable impeller strength thereabout.

I have found that the method of designing l the curvesnof my impeller blades, as above defined, forms effective blade surfaces for coperation with the plane sealing faces,

for the plane faces, corresponding differences in the impeller blade curves will be required and these can be determined practiby means of screws 41,.

cally' with ease.

The planesurfaces of the locks `or cut-offs may be easily and accurately laid out and machined and are very desirable even when not adjustable. They may be made adjustable in any of a great variety o ways of which I have shown but two, one illustrating nicety and ease of adjustment and the other simplicity of construction.

In the form shown in Figs. 5 and 6, I groove the impeller longitudinally at 36 throughout its length, and with its depth' preferably tangential to the pitch circle, to provide seats for plates 37, and cut itdeeper at each edge to provide spaces 38 wit in which the operating lugs of wedges 39 are placed. The plates 37 form the effective sealing faces, coperating with the. blades or vanes of the impeller's and are adjusted by means of the wedges 39, which may be 'moved independently, but which are moved toward or away from each other to effect or permit outward or inward movement of the plates 37 through parallel positions. If the wear toward different-ends of the machine be different, or the machine be set up in a position to cause uneven stress or twist .upon the surfaces, the variation can be taken up by adjusting one only of the wedges.

The movement of the plates 37 outwardly is here shownas limited by two sets of means, shown as screws, ofvwhich the set 40 at all times takes the outward strain brought upon the plate bythe wedges 39 as these are drawn toward each other by the screws 41. Before effecting additional outward movement of the plate 37, therefore, one or both of the screws 40 must be slacked. to the desired extent, after which the wedge or wedges 39 are forced in to take up the slack Within the impeller body at this point are cast or otherwise located sockets 42 whosel openings, best seen in Fig. 4, are of keyhole form, being enlarged at 43 to permit the passagev of heads 44 of screws 45, while the openings are smaller at 46 to retain heads 44 therein. The plates are inserted with the screws 45 in place by passing the heads 44 through the openings 43. The plates are then moved longltudinally to position with the parts as shown in Fig. 5, after which the wedges 39 are put 1n' place and the screws 40 and 4l are inserted. f

rlfhe screws 45 are intended to limit the ultimate outward movement of the plates 37, particularly in 'case of withdrawal, accidentally or otherwise, of the screws 40. Both sets of screws 40 and 45 are intended to protect against outward-strainsI but bothv are protected against strains due to centrifugal forces by the engagement of plates 37 .withl the edges 47 of the openings 36 in the lmpellers. Since the plates lie, preferably,

with their faces in radial position with respect to the impeller shaft, the centrifugal strains will be received squarely upon the preferably tangential edges 47 of the impeller and there will be no shearing nor other centrifugal strains upon any of the screws or fastenings used. The wedges 3S) are recessed at 39 to allow adjustment without interference with the screws 40.

In the form shown in Figs. 8 and 9 the same grooves 36 are used to provide seating for the adjustable faces, and the same edges 47 receive the radial thrust due to any centrifugal action present. The plate 37 is rctained finally by the dovetailed part 48 fitting in t-he corresponding groove 49 and permitting insertion of this member from the end. Here liners of different thickness or successively changed number are intended to be Ainserted at 50 and the plate is drawn back rigidly against them by means of screws 5l passing through the material of the impeller.

It will be evident that other forms of adjustment than by wedges or liners, and other securing and operating means than by screws, may be used and that a similar action might be obtained by movement of the plane surfaces in other directions than that indicated to effect the adjustment. lVhatever form of adjustment is used, all ofthe faces are, preferably, initially set at an intermediate position in their range of adjustment. Vhen wear of the gearing requires adjustment, one of the two faces upon thc same side of the impeller is set farther out and the other farther back in the impeller to bring the faces into operative relation to the blade of the other impeller, whether it be lagging or leading. fear upon' the lock faces may also be compensated by outward adjustment of the face which' is worn. Some of the advantages of the plane face may be peller, with interchange of these sealing functions successively by the-waist and blade of the two impellers alternately and so as to maintain a continuous seal between the impellers at all times. In each sealing cooperation of one side of the waist of one impeller with the blade of the other, the blade coperates with two sealing waist faces, each of which faces in coperation witha blade presents an embodiment of one part of my invention. The plane faces, whether adjustable or not, perform valve functions only in these relations, and are capable of uses where the rotor upon which they are mounted is a valve only, and never an impeller. I have, therefore, considered the one member as an impeller and the other as a'valve only,

'in some of the claims.

Having thus described'my invention what I claim as new and desire to secure by Let.

ters Patent is 1. In a blower, a pair of impellers, each having blade and lock portions, the blade of one coperating with the lock of the other, and plane lock portions upon each impeller.

2. In a blower, a pair of impellers having belled blade` portions and plane facings for lock portions, the blade portions of each impeller coperating with the lock portions of the other.

' 3. In a blower, a pair of impellers having their blades belled and their lock portions lying substantially in planes radial.

4. In a blower, an impeller having belled blades in combination with a rotary .mem-

` ber locking with the blades and havingv its locking surfaces plane.

5. In a blower, an impeller having belled blades in combination with a rotary locking member, a movable facing coperating therewith and means for substantially tangentially adjusting the facing.

6. In a blower, an impeller having blades in combination with a rotary lockin member therefor, providing separate loc faces adjusting the locking facestangentially with respect to the rotary locking member.

9. In a blower, an impeller having belled blades in combination with a rotary locking 'clement having its locking faces lying substantially within quadrant planes through the axis of its rotation.

10. In a blower, an impeller blade, a rotary sealing member therefor, an adjustable locking plate for the member` and separate adjustments for different ends of-the lock.

11. In a blower, a pair of belled impellers, each impeller havingbelled blades on opposite ends and a lock on each side between the blades for one of the blades of the other impeller and having plane faces upon opposite sides of each lock.

12. In a blower, two cooperating impellers, each having two belled blades and intermediate plane sided locks.

13. In a blower, a belled blade having one side plane and approximately radial in proximity to the waist for engagement with another impeller.

. 14. In a blower, an impeller blade, a rotary sealing member therefor, a movable sealing face for the sealing member, longitudinally movable wedges for moving said face, means for moving the wedges/ and means for limiting the movement of the sealing face.

15. In a blower, an impeller, a rotary sealing member thereforffa movable seal upon said member, wedges for moving said seal, means for limiting the movement of the seal and additional means for limiting the ultimate movement of the seal.

16. In a blower, an impeller, a rotary member coperating therewith and, longitndinally grooved to provide a substantia 1y tangential abutment, a removable locking face -for the impeller located in said groove and resting agalnst the abutment and means for adjustlng the vposition of said face in a tangential dlrection.

17. In a blower, an impeller blade, a rotar grobved to form a seatfor a locklng facing, a facing therefor, means admittln saidfacing by longitudinal movement an ligniting the outward movement thereof and means for adjusting the facing. a

- THOMAS W. GREEN.

Witnesses:

THoisrAs D. MowLDs,

HELEN I. KAUFFMAN.

locking member therefor longitudinally-

Images