US1317294A - Brand - Google Patents

Description

E. P. DEBRAND.

ET PACKING.

AP no" HLED JULY 7. 1911.

1,317,294. PatentedSe ,1 19.

Fig.1 I

E. P. HILDEBRAND.

METALLIC PACKING.

APPLICATION HLED JULY 7. 1917.

1,317,294.. PatentedSept. 30,1919.

5 SHEETS-SHEET 2. Fig.3

wuwltoz Edward P. Hildebrand E. P. HILDEOBR-AND.

METALLIC PACKING.

APPLICATION FILED JULY 1. 1911.

1,3 1 7,294. Patented Sept. 30, 1919.- i 5 SHEETS-SHEET 3- Fig. 4

E. P. HILDEBRAND.

METALLIC PACKING.

APPLICATION HLED JULY 7. l9l7.

1,3 17,294. Patented Sept. 30,1919.

5 SHEETS-SHEET 4.

Ell mentor Edwand Pliildebnand mu COLUMBIA PLANOORAPH cn., WASHINGTON. n. c.

E. P. HILDEBRAND.

METALLIC PACKING.

APPLICATION FILED JULY 1.1911.

1,3 1 7,294; Patented Sept. 30, 1919.

5 SHEETS-SHEET 5.

Fig. 10

V fllll-l I ll llillV A Figll 'awumdtoz Edward P Hildebrand EDWARD P. HILDEBRAND, 0F SEATTLE; WASHINGTON.

METALLIC PACKING.

Specification of Letters Patent. Patented Sept. 30, 1919;

Application filed July 7, 1917. Serial No. 179,222.-

To all whom it may concern: V

Be it known that I, EDWARD P. HILDE- BRAND, a citizen of the United States, and resident of the city of Seattle, county of King, and State of Washington, have invented certain new and usefullmprovements in Metallic Packings, of which the following is a specification.

My invention relates to metallic packings for piston rods and comprises certain novel parts and combinations of parts whichwill be hereinafter described and particularly defined by the claims. I p I The object of my invention is to provide a metallic packing which has a capacity for large wear without getting in such shape that it will leak and which will make as tight a joint after large Wear as it will when used.

A further object of my invention is to make a metallic packing such in construction that small particles of scale or dirt of any kind which 'may get into the packing is likely to be discharged away from the wearing surfaces and also to "provide means whereby such foreign particles may be blown out of the packing.

A further object of my invention is to pro vide a construction of packing in which means are provided whereby oil may be positively applied to the wearing surfaces within the body of the packing.

Other objects of my invention will appear from a study of the specification andthe drawings and will be hereinafter described and then claimed. W

In the accompanying drawings I have shown my packing in the forms of construction which are now most preferred by me.

Figure 1 is a section taken through i a portion of the head of a. cylinder and the rod packing applied thereto.

Fig. 2 is a. transverse section taken substantially on the line 2-2 of Fig. 1.

Fig. 3 is an axial section taken upon a different plane from that shown in Fig. 1, showing more particularly the manner of applying supply and blow off pipes to the various parts of the packing in order to more thoroughly blow out foreign matter.

Fig. i is a longitudinal section taken through a packing made in accordance with myinvention, in which the casing is longitudinally split.

Fig. 5 is a transverse section of the type of packing shown infiFig. 4:.

Fig. 6 is a plan view of the outer surface of the crown ring employed in'niaking my packing. I

Fig. 7 is a transverse section through this ring. v,

Fig. 8 is a face view of the packing rings which are employed in maintaining a tight joint along the surfaces of the piston.

Fig. 9 is a face view, witha. portion of one segment broken away, of the sealing ring which is employed in connection with the ring shown in Fig. 8.

Figs. 10 and 11 are, respectively,face view and section ofv the bridge ring employed in my device. I p h Fig. 12 is a transverse section taken between adjacent rings of my packing showing the employment ofa snifter valve to control the blow off. 1 r In the drawings, A represents a portion of the head of a steam engine cylinder and B a section of the piston rod which reciprocates through a hole in the head A. Sur rounding the piston rod B and forming an integral part of the head A, is usually found an annular flange or boss 0. The pack ing devices are usually secured to this part C as is shown in the drawings.

I will first describe the type of construction shown in Fig. 1, being that in which the casing is composed of a series of integral rings which may be separated lengthwise of the piston rod, but which can not be removed from the piston rod without uncoupling the engine.

Adjacent thecylinder head and engaging the outer face of the flange C, is" the memher 1, which I havecalled a crown ring. The appearance of the outer facefofthis ring is shown in Fig. 6. Between this ring and the flange C is usually provided a gasket or ring of packing material 11, in order to secure a tight joint. Crown ring 1 is provided with a slight, inwardly vprojecting flange 12, which snugly fits within the opening D which surrounds the piston rod within flange C. This flange serves to accurately center the packing device.-

Extending inward from the outer face of this ring is a recess 13,- of such size as to loosely receive therein the 'shield ring 2.

When the shield ring is in place, an annular,

chamber D and the recess 13 in the crown distance sufficiently to provide a groove extending about the ring beyond the outer sur face of the flange 14. The flange 14 1s also cut across by grooves v15 so as to form freecommunication between the groove 13, or the space which occurs between the shield ring and the'crown ring, and the space D V I which immediately surrounds the piston rod.

, The, shield ring-2 ispreferably made in .two. or more segments and .fits'closely against the outer surface of the piston rod. To insure vayielding engagement with the surface of the rodI groove the outer surface of this shield. ring. andplace within the grooves springs 20-, which, are coiled springs extending entirely around the ring and having :their ends secured together." These are placed under sufficient initial tension to yieldingly press .the segments of. the ring against the piston rod. g

I ,prefer to construct the surface of the ring, which istoward the cylinder,.so that it is a conical shape, as is clearly shown in Figs. 1.and,3. ,This surface 21, if the-engine; is a vertical engine, has a tendency. to deflect any particles of scale or foreign mat-v ter which enter the chamberD, downward and outward, This conical surface. may include the entire upper surface of the ring, as is shown in Figs. .3 andet or stop short of the piston rod, asinFig. 1. The outer portion of the uppersurface of: the shield ring 2, is made to conform incontour with the outer face of thesegmental flange 14 of the crownring. In use, these. surfaces are;supposed to be practically in, contact, not of sucha natureas ,to bind the shieldring againstmovement transversely of the piston rod, but to prevent any material movement lengthwise of the piston rod. In. this condi tion, the slots 15in the crown ringfurnish free and ample communication between the I.ing. The under or ,outer surface of the shield ring. 2 is recessed, forminga chamber 22 of such size as to receive, one or moreof the metallic, packing- -rings. 1 This chamber is enough larger than the diameter of the packing ringsjthattheymay have a limited :free

movementina direction transverse the axis of the piston rod. The depth of this recess is such that while the rings are snugly engaged at top and bottom, they. are not bound against movement transversely of the axis of the rod.

Next outside of the crownringl is the ring 5 which I havev called the scavenging ring, it is provided with means whereby the chamber D may be blownout and thus cleansed of any foreign particles. This ring .shown a drainage ring- 6.

has an inwardly extending web 50 which forms a bridgepiec'e between consecutive pairs of rings 8 and 4. It is also provided atoneside; with a ch'amb er 51 to Which a' pipe 52 is attached, this pipe being the blow off pipe, and leading to any point where it is desired to convey the steam and foreign material discharged from the chamber D. The chamber 51, with which this pipe connects, is in communication with the chamber 13, which surrounds the shield ring 2. The pipe 52 would naturally be provided with a valve,as' 53, by which it'isI controlled. The hole in the head A through which the piston rod passes, is not such a tight fit but that a small space is left through which the .steam'may blow. Whenever the valvecontrolling the pipe 52 is opened steam will be blown out-through the chambers D and 13, carrying with it anyparticles of dirt or foreign matter which may have found their way into these chambers. i

' The valve for controlling this discharge pipe may be an automatic valve which will open if thepressure exceeds any figure for which it has been set, and also, one which may be opened by. hand when desired. This wouldbe an automatic snifter valve, and such a valve as that is indicated as being So applied in Fig. 12. The valve 53 ,therein indicated is of a standard constructionand description of the particular construction thereof is not believed to be necessary. 2 Next outside the scavengingring 5 I have The contacting faces of the drainage andscavenging rings are recessed, as shown at 56 and 62, to receive a bridge ring 7 This bridge ring is of plain construction in two half rings, as isishown in Figs. 10 and 11; Its inner bore isslightly larger. than that of the piston rod. The drainage ring 6has a'flange 60 projecting inward, which is in function the same as the bridge ring .7, each of which forms a supporting partition between consecutive pairs of packing rings. This drainage ring 6 has a drain pipe 61 connected thereto sothatany water which'may have-reached this point will be carried away. i I ,7 1 Next outside of thedrainage ring6 isEthe outer flange plate 8. Through holes formed in this piece the securing ,boltsSOare screwed into the flange Cfof the cylinder head.v The drainage ring 6 andfiange ring 8 arezpro vided with ,complemental recesses 68, which secure exact registry. between therings and also forman offset surface to better water passing between them- The packing rings are shownas. used in prevent an angle of 45 with the tangent, so as to make a sharp edged flange 40. The major part of the end of each of the ring segments is cut so as to parallel the like part of the end surface of the adjacent segment. This arallelism is, however,- not the essential feature. The essential feature is that the outer edges of th end surfaces 41 shallnot be nearer together than the inner edges of the same surfaces, so that, as the ring wears down and the ends thereof approach each other, the small chamberthusf rmed between the ends of the segments will remain open to the exterior at all times.

The 45 angle formed by the exterior sun faces of the points 40 with the tangent, is the angle which would be employed when the ring is cut into four segments. While it is possible to cut the ring into a chiferent number of segments, I pre er to use four seg ments. The angle en iployedshould be such as would make this. outer surface of the point 40 arallel with the direction of bodily movement of the ring inward as. its inner surface wears away-.-

The points 40 are brought to a sharp edge and the sharp ed esv of adjacent segments are in contact when the inner surfaces of the segments are incontact with the rod; Under these conditions,- when the inner surfaces of the ring segments wear away they will move nearer the center,- but the wear which pcrmits their movement toward the center of the rod wears away the points 40 to such a degree that the sharp edges of these points always remain in contact, thus. making a perfectclosure at all times. I

With the rings so constructed there is no recess or cavity directly communicating or openin intothe piston rod receiving s ace.

There is, therefore, nocavity on their inner surface for the collection of dirt. Furthermore, in case any dirt should get between the piston rod and these ring segments, it will have a tendency to force this segment outward. This would slightly open the inner end of the chamber formed between the ring segments and would permit the particle of dirt to pass between the adjacent ends of the segments into the chamber between them, and thus into the chamber which surrounds them, at which point it can do no harm. I have, however, provided means whereby dirt which has been received into this annular chamber may be blown out.

In conjunction with the ring formed by segments such as is shown in Fig. 8, I enrploy a ring 3 which, however, has its segments ends cut radially. This ring need be made only in two pieces. In both types of rings I provide circumferential grooves in which are placed coiled springs 20 so that these rings are held with yielding pressure against the piston rod.

In Fig. 3 I have shown the means whereby all of the annular chambers surrounding the pairs of'pa'cking rings may be blown out at will. In this view the plane of section has been chosen and the rings so placed that the ends of the component segments of the rings are. shown. The chambers 13, which surround the rings, are connected with pipes 9, which pipes are each provided with a valve 90, by which it may be controlled and connects with some source of supply of steam or air under pressure.

At the opposite side of the casing a corresponding set of pipes 91 are shown, each controlled by a valve 92. The connection of these pipes with the chamber 13 which is within the shield ring 2, is by means of a channel 93 which extends inward within the body of the scavenging ring 5. By such a construction it is possible, by opening the proper valves. which are connected with any one of the spaces 13, to blow steam through this passage and thus to blow out any particles of dirt or foreign matter which may have collected therein. Such a provision may not ordinarily be required but there are certain special cases where the water employed in making steam carries a large percentage of foreignmatter, and scale is very aptto form and get into the packing. In such case, the ability to blow it out may be of great advantage.

The construction of casing so far described lias been that employed where it is composed of a series of rings each of which is integral and extends entirely about the piston rod. InFigs. 4 and 5 I have shown a casing which isconiposed'only of two parts 10, these beingjoincd upon a plane which is parallel with the axis. of the piston rod.

In this case the bridge flan es 70, which are interposed between adjacent pairs of rings, are integral with the casing. The casing is also secured together by means of 'bolts 35, or in any other suitable and convenient manner. Such a casing can be placed upon and removed from the rod without uncoupling the engine. In the other type of casing the packing rings may be easily removed by dropping the casing rings down.

In Figs. 1 and 2 I have shown one of these rings, as the scavenging ring 5, as being provided with a channel 55, lying within the sides of the bridge flange 50 and extending from the inner edge thereof adjacent the piston rod, to the exterior of the ring. A pipe 54 is connected so as to communicate with this channel and employed as a means for the positive introduction of oil to the packing.

. Any suitable means whereby oil may be forced through this pipe to the packing may be employed. In this way the oil may be applied directly where needed to the interior of the packing instead of the piston rod outside of the packing,-trustingto a sufiicient 7 said shield ring and blow ofl connections extending from said recess.

2. In a metallic packing for rods bination with segment rings, and a'casing having recesses for said rings of a. size to form .an annular passage about the rings, of means for blowing steamthrough said annular passage. .1 W

3. The combination with ametallic packing for rods of a shield ring closely fitting about the rod next to the cylinder head and a casing member having Ia'recess for said ring of an excess diameter to form an annular space extending about said ring to permit .diametrical shifting of the ring, said parts having contacting surfaces which are perpendicular tothe axis of the piston rod and grooves extending across .these surfaces and connecting said annular space with the exterior surface, ofthe rod, and the. casing having a blow ofi channel'leading from said annular space; 1 I I y 4. In a metallic piston :rod packing, a shield ring placed about the rodnext to the cylinder head, a casing member having a recess for the shield ring of a diameter greater than-the ringto thereby-form an annular space outside the shield ring, within which the shield ring may freely shift laterally of its bore,said parts being constructed the com- 7 to maintain freefcommunication at all times between said annular space and the 1 piston rod bore of thecylinder head, and also having a blow off channel leading from said annular space.

. 1 5. A metallic packing. for rods comprising a shield ring fitting closely the rod and having a ring receivmgrecess, r1ngs-1nsa1d recess, and a casing member havinga reccss receiving the shield ring and: leaving a passage surrounding the said shield ring and means for freely blowmgsteam through sald passage.

6. A metallic packing for rods comprising ackin' rin s ;a shield rin havin a recess C 7 D b for the packing rings .and interposed between the packing rings and theflpressure, and a "crown ringinterposed between the shield ring and the'pressure and having a recess of greater'diameter than the shield 1 greater diameter than the shield ring and a blow ofi connection with said space, and also havingbearing engagement with the pressure receiving face of the shield ring and channels connecting the shield-ring-receiving recess with therod receiving space.

Signed at Seattle, Washingtomthis 2nd day of July, 1917. 1 I EDWARD P. HILDEBRAND.

Copies of this patent may be obtained forfive cents each, by. addressing the Commissioner of Patents. Washington, I). G. r

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