US1867320A - Pump packing assembly and packing rings - Google Patents

Description

July 12, W32.

J. H. M EVOY PUMP PACKING ASSEMBLY AND PACKING RINGS Filed Sept. 11, 1928 2 Sheets-Sheet atto'l, ma

July 12, 1932. J. H. M EVO PUMP PACKING ASSEMBLY AND PACKING RINGS Filed Sept. 11, 1928 '2 Sheets-Sheet 2 Patented July 12, 1932 UNITED, STATES PATENT. oFFica JOSEPH H. McEVoY, or HOUSTON, TEXAS PUMP PACKING ASSZEJVIBLY AND PACKING 'RINGS Application filed September 11, 1928. Serial No. 305,222.

The invention relates to an improved arrangement of the packing disposed about the Another object is to devise a packing as-,-

sembly which will be adjustable'to compen- 1 sate for wear without being removed from the pump barrel. v

A further object is to so arrange the packing and spacer rings either upon the pump rod or upon the pump barrel that they may be readily. adjusted and a fluid tight seal be maintained throughout the life of the packlng.

Other objects of the present improvements are to provide an improved valve construction, a novel ratchet arrangement to retain the packlng in compressed relatlon, and to manufacture this particular type of packing in several forms inaccordance with the demands which may arise.

9 Other and further objects will be readily apparent to those skilled in the art when the following description is considered in connection with thedrawings, wherein v Fig. 1 is a longitudinal section of a pump Fig. 5 is a view similar to Fig. 1 but showing the packing carried by the pump rod instead of the pump barrel. 1

Figs. 6 and 7 show modified forms of this type of packing.

Figs. 8 and 9 show an elevation andsection showing the improved packing arranged respectively of the lower end of the pump plunger While,

Figs. 10 and 11 showan elevation partly broken away, and a section of the spring sleeve as used in Fig. 5. f p

The construction shown in Fig. 1 discloses a pump barrel 10 which carries threaded to its lower end a coupling 11 which in turnis threaded to a nipple 12. This nipple 12 is connected to a standing valve assembly .13 of 1 usual construction. The coupling 11 has upper end terminating in a shoulder 14, and is hollowed internally to provide an annular seat 15 for the packing 16. This packing, tends to prevent the passage of sand and grit; upwardly around the pumpplunger. v V Y Inside the pump barrel 10 the pump plunger or pump rod 20 is adaptedto recip rocate. Between the pump plunger and pump barrel is an annular opening which. is to be filled with packing material which mustv maintain a fluid seal between the-two members. The packing maybe arranged in any of several forms as disclosed by this application. Fig. 1 shows an assembly ofspacer rings 21 and packing rings 22. These rings may be arranged as shown with their wedge faces in contact. These rings may be formed as a closed annular ring, theymaybe split ringsor in some. instances formed of two or' more sections to make up an annular ring. The spacer rings 21 it will be noted are somewhat separated leavingan opening23. As.

the packing rings 22 wear away in use the.

spacer rings are compressed at intervals' 'to eventually fill'the space 23 as will'be'later described. I V 1 The spacer rings may be formed of steel, 1 brass orany other suitable metal but are preferablyof ametal somewhat harderthan the packing rings which may be of babbitt, tin,

solder, lead or any suitable metalalloyiwhich. may be readily deformed. i

The spacer rings'21 as shown haveagroove: 2 1 at the apex of the face and adjacentthe meeting edges of the packing rings. When the entire'packer is compressed the tapered faces of the respective rings 21 and 22'ten'd to slide uponeach other which resultsincom pressing the packing to form a fiuid tight.

compressed the edge of each ring is deformed to enter the groove 24, whereby each ring is then somewhat firmly attached to its re- .spective spacing rings and no one ring is then able to take up .all of the movement of the entire assembly.

The lowermost spacer is shown as a half, ring and rests upon the shoulder 14 previously described. The uppermostspacer, is.

also a. half ring and forms a shoulder 25 upon which is placed the compressing sleeve 26. This sleeve forms a means for retaining the packing assembly in position and hasinternal and external acking rings thereon as shown at 27 and 28, V enlarged elevation of the sleeve which is made of spring metal and has longitudinal slits V therein thus forming the fingers 30. Each 201 finger 30 has its end flared outwardly and formed with ratchet teeth as at 31. The sleeve may, however, be formed without the slits and a single spring finger punched therefrom to act as a locking member. The inside of the pump barrel 10 has ratchet teeth 32 which correspond to and'are adapted to mesh with the aforesaid teeth 31 The'top of the pump plunger 20 has threaded to it the usual valve cage 33, but in this instance the lower end 34 thereo-fserves a specific function. Fig. 1 shows a pump plunger at a point below its normal working position but still it maybe lowered further.

until the end 34 of the cage 33 contacts with the ledge 35 on the inside of the sleeve 26. It is by means of this structure that the packing assembly is' compressed at will. The pump plunger is lowered to a position such as shown in Fig. 1 and then dropped sharply to strike theledge 35. This drives the sleeve 26 downwardly and compresses the packing rings which as stated are supported on the coupling 14.. }As the sleeve 26 travels'downward the ratchet teeth 31 slide past the teeth 32 of the pump barrel and the packing is thus held in its compressed condition. As the,

packing rings wear away the sleeve 26 may be again bumped or struck to further compress the packing. a a V It seems apparent with this construction thata novel assembly has beenevolved and that any necessary adjustment of the packing is easily obtained by merely lowering the pump rod as described. Themetallic packing used is not subject to deterioration when subjected to hot water which is often encountered andithere is nothing in the assembly to be replaced until the packing rings'have been completely worn away and 'th'e'ratchet driven to its lowermost position. z The pacl 'ng assembly as hereshown form a rigid substantial support for the pump plunger 20 so'that any tendency of vibration is avoided The additional packing rings 27 and 28*prevent'sand and grit from entering ig. 1. -Fig..4 shows an the assembly so that wear of the parts is reduced to a minimum.

Fig.2 shows a broken section of the assembly of Fig. 1 but having spacer and packing rings of a different configuration. The spacer rings as in Fig. 1 may be made of any having a concentric annular groove upon one side and a-ridge upon the other side. WVhen two of these cap rings are placed with'the groovesthereof adj acent,*a cavity is formed to receive the packing ring 44. The cap members and packing ring are both formed of a readily'deformable metal but preferably the ring 44 is softer-than the cap rings42 and 43 whereas the spacer rings 40 are composed of a material harder than either of the others.

7 This embodiment of the invention is con structed to function the same as that of Fig. l 'as when it is compressed the packing ring 44 will bulge out expanding the cap rings 42 and 43 forming a. fluid tight bearing for the pump plunger. Theadvantage obtained by this construction is that the'so-fter pack-ing metal 44 is confined between walls of harder metal and does not therefore come incontact with the moving plunger rod. This proexpanded forcing the ring 52 into fluid tight' engagement'with the pump rod. This form of the invention is especially adapted to a worn pump rod where agreat deal of eX-' pansionis desired and could very fWell be used to accommodatelthe'next smaller size of pump plunger by merely compressing the sleeve 26. s

' In combination-with the structure just described in Fig. Lthere is shown an improved; valve-55 which isshown' best at the topof Fig. 5. It has been customary in pumps'fof this type to provide atth'etop a ball valve similar to that shown at-"the bottom of Fig. 1, however, "a valve having acone seat '56 and a stem 57 whichis ada-pted'to slide in a sleeve 58, has beenfoundinuchbetter in sew-s ice. Such a valve as shown when pressed to closed position; by a spring 59 is=at-all times held in a perpendicular position and quickly seats whenthe flow'offiu-id ceases. With the usual ball valvethe fluid, gasesv and barrel 71.

iseaso sand passing tend to set the ball to bobbing around against the seat and the valve cage whereby it is soon worn and a leaking valve results. The valve seat as here shown is a removable ring 60 which rests upon a coupling 61 threaded to the pump rod. The valve cage 33 is threaded onto the coupling 61 and has a shoulder to engage the ring 60 and hold it firmly in position.

Fig. 5 also shows a form which the invention may take in that the packing rings, spacer rings, and ratchet sleeve are carried by the plunger and the moving surface is between the packing rings andthe pumpbarrel. Theform shown in Fig. 5 is somewhat similar to the form of Fig. 2 but the cap rings 65 and 66 have been modified to cover only one side and one edge of the packing ring 67 Thus the packing ring rests in constant engagement with the plunger 70, andthe harder metal 65 and '66 takes the wear with the The spacer rings 72 have-been altered to meet the existing conditions, nan1e 1y, several oil grooves 73 have been provided to trap lubricant and to prevent the passage of sand or grit. The internal surface of the spacer ring 72 has been hollowed out as at 74. 1

The construction of the ratchet sleeve is similar to that of Fig. 1 except the sleeve 76 is carried'by the pump plunger 70 and the ratchet teeth 77 are formed on the plunger at 78. Having reference to Figs. 8 to 11, enlarged views of the sleeve and ratchet are shown. The ratchet teeth are here shown as a series of threads 77 which may either be right or left handed as desired. A longitudinal groove 79 is formed in the plunger which acts as a lock in conjunction with the finger. 80 of the sleeve 76. i

A special coupling 83 is shown connecting the pump barrel and the nipple there below and has an inwardly projecting shoulder 84 upon which the ledge 85 of the sleeve 76 is adapted to be struck the same as in the arrangement of Fig. 1. A separate ring may be provided to take the place of the integral shoulder 84 if desired. If this is provided it is held in place by the adjacent ends of the pump barrel, and nipple as well as-the coupling 83.

In-this form of the ratchet sleeve it is preferable that any compressing of the packing rings be done by screwing the sleeve 76 onto the threads 77. To accomplish this the pump rod is lowered until the weight rests upon the shoulder 84 and the ledge 85, the plunger is then rotated and the weight compresses the packing and permits rotation of the plunger in the sleeve 76. It isto be understood that either the ratchet of Fig. 1 or the threaded arrangement of Fig. 5 may be employed.

Fig. 6 shows a further embodiment of the packing assembly as adapted for use in Fig.

5, namely it is to be carried by the pump with the pump rod.

plunger" instead of the casing. Th1Sjdi$- closure is theexact counterpart of-Fig; 1.- The spacer rings 88 and packing rings 89 being reversed as to their position. a

Fig. 7 shows a still further modification adjacent the pump barrel to take the wear.

The packing rings 93 have on their inner 3 surface a shim 92 which may be of brass, this shim 92contacts with one of the steps 94 of the spacer ring 9O.v Thus when the-sleeve 76 is screwed or bumped over the ratchet teeth the shim 92 shears off of the step 9.4 to

. the next step and allows the rubber packing ring 93 to firmly press it into engagement The several figures of the drawings illustrate staggered sets of rings in mostinstances 'butfor the purposes of'this improvement the U entire assembly may ifdesired be madeof packing rings and the spacer rings dispensed with. In the event this form is adopted the packing rings would have co-acting grooves and recesses as shown in Fig. 2 onthe cap and spacer rings. Either-the packing or the spacer rings may be formed in rings similar to the spacing rings of Fig. 2 if desired.

The spring sleeve of Figs. 4' and 10 may be if desired formedother than here illustrated in'that any number of fingers may be provided or asstated the sleevemay be tubular and a single indented or outwardly pressed compress the packing at the top of the assembly, Whereas Fig. 5 shows it at the bot- "tom, either may be used as the occasion demands without departing from the spirit of the invention.

It is believed that from the foregoing description those skilled in the art will be enabled to practice the improvement which may readily. take embodiments other than here shown without departing from the spirit of the invention.

Having described the invention, what i claimed is: 1

1. In a pump, alternate packing and spacing rings, each packing ring being elongated adjacent the inner side and of shorter length on its outer side, said spacing rings being shaped to interfit between said packing rings and formed witha plurality of shoulders and an inner sleeve on said packing rings to engage one of said shoulders on 7 2. In a pump; alternate packing and-spac ing rings, each packing ring being elongated adjacent the inner side and of shorter length on its outer side, said spacing rings being shaped to'interfit between said packing rings and formed with a plurality of shoulders,

said rings having elongated portions 011 one a side and shorter portions on theopposite side to-interfit with adjacent rings and a sleeve at one end of said-packing assembly :said sleeve fitting between said plunger member and said barrel member and spring fingers on said sleeve provided with ratchet teeth engaging one of said members to resist longitudinal movement away from, said packing but allowing compression of said packing rings.

4. A pump including a, pump barrel, a plunger in saidbarrel, a packing assembly between said plunger and said barrel supported upon said plunger,a sleeveon s'aid plunger below said packing, spring armson said sleeve having ratchet teeth thereon, said plunger having ratchetiteeth cooperating therewith to prevent said sleeve from down- Wardinovement thereon, and means on said pump barrel cooperating with "said sleeve to move said sleeve to compress said packing rings longitudinally. v In testimony whereof Ihereunto afiix my signature this 28th day of August,-A. D. 1928.

JOSEPH H. MoEVOY.

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