Патент USA US2410976код для вставки
Nov. 12, 1946. H. F. JOHNS 2,410,976 OIL WELL PUMP PACKING Filed Sept.y 23, 19434 rlift!?. l i te" INVENTOR. Haß/‘_y f? Joh/7.5 ‘2,410,976 ~lì’atentecl Nov. 12,1946 UNITED STATES PATENT or-EicE DIL WELL .PUMP PACKING Harry Johns, vKansas City, Mo., assignor to Velma V. Johns Application September 23, 1943, Serial No. 503,518 1 -Claim. (C1. 286-31) 1 This invention relates to rpumps of the charac ter used for deep well pumping, and more par ticularly, to improved packing means for pumps of this type. In deep well pumps the packing, for sealing the circumferential surface of the working vbarrel in its ‘reciprocating travel within lthe pump often Wears rapidly due to sand and like abrasive sus pended in the liquid ’being pumped. VThis neces in cylinder 20 ynear its lower end, and a second nipple 2-6 is interposed `in said cylinder nearer ¿the upper end thereof. Mounted for reciprocation within bore 24 of nipple 22 is a tubular working barrel 28 carrying a traveling valve 29 l-on its Vlower end, the latter comprising a seat 36, a ball 32, normally resting on the seat, and a perforated retainer ring '3'4 Since the pump Vis usually located at, or near ‘the bottom of the well the resultant cost of removing the entire pump assembly, including the `pump to the seat. secured in any suitable manner within barrel 28 sitates frequent replacement of the packing. 10 for limiting upward movementfof the ball relative tubing and `sucker rod string, is relatively ïhigh. To this cost must be added the loss >in time and -production during the period while the pump is ` As will be clear from Fig. ‘2, the upper end of nipple 22 is concaved to form a seat for the yadja cent end of a lower packing `sleeve 36 of suffi cient thickness to iill the space vbetween barrel 28 and inner cylinder 2i). A similar upper pack ing sleeve 38 is positioned adjacent a'bearing col lar 46, against which rides an adjusting sleeve 42 'It is the primary object of this invention, there surrounding the working 'barrel 28. An expan fore, to provide a pump embodying `means to au tomatically compensate ‘for the wear on packing "20 sion spring 44 interposed between packing sleeves v33 and 33, serves to compress the same ‘to snug incident to operation ofthe pump. inoperative. ` ' A lfurther aim of the invention 'is .to 'provide va pump with packing on which a spring pressure rfrictional Yengagement ' with "barrel 2 8. been accomplished with structure illustrated in the accompanying drawing, wherein: the bore `56 o'f’upper head l2, `the latter being also provided with a plurality of longitudinal vducts 5B foi` passage of liquid from cylinder 20 into tubing The’upper end of working barrel '128 is joined 'by a nipple '45 with the »lower end of a perforated is constantly maintained, and to embody mechM anism within the pump whereby the springs for 25 cage 48 of a check valve 49, wherein is `mounted a ball 50 vnormally resting yon a seating ring ‘52 applying -the pressure may 'be reloaded atfwi’ll lwithin the cage. yA pilot rod 54, threaded »into the from the surface of the well. upper end of cage At8, is rec-iprocably mounted in These and other objects =of the invention Ahave Fig. 1 is a central, longitudinal, condensed sec tion of the upper portion of a pump constructed in accordance with this invention. Fig. 2 is a similar condensed, sectional view of 35 the lower end of the pump. Fig. 3 is a cross section of the pump taken on the line III--III of Fig. l. Fig. 4 is a cross section on the line IV-IV of 60 connected by a coupling -62 to a reduced upper end of head I2. A string of sucker rods 64, threaded into a socket 66 of rod 54 leads to the surface of the well and is connected to a pump jack or the like, in the usual manner. Formed on lower head Ill at its uppermost end, . is a reduced, externally threaded neck 65 for mounting the cage 66 of a standing valve 61 Fig. 5 is a cross section taken on line V-V of 40 wherein is contained a ring seat 68 and a ball 10, normally resting on the seat. A short nipple Fig. 1. l2 »is threaded into the upper end of the cage The pump comprising the instant invention is 66 to retain the ball within the cage. a long, slender, cylindrical unit without external Within |the lower end of inner cylinder 20 and protuberances to move freely through the casing of a well. and includes 'a lower head Il) and an up 45 extending from lower head I0 into a threaded recess 69 of nipple 22, is a liner 'II spaced con per head I2, which are joined by an outer cylin centrically from the inner cylinder and from der I4. Lower head lil is provided with a reduced, Working barrel 28 to form a chamber 13 for liquid externally threaded neck Iâ engaging the upper entering the pump through an axial longitudinal end of a strainer I8, or the like, extending into the Fig. l; and» v body of liquid to be pumped. An inner cylinder 20, concentric with outer cylinder I4 and spaced slightly therefrom, is se cured at its lower and upper ends to reduced por bore 'I4 of head I0. Y Referring again to lower and upper packing sleeves 36 and 38 respectively, these `sleeves should be formed of compressible material in order that reduction in cross sectional area of each sleeve tions of heads I0 and I2 respectively. A nipple 22 having a relatively small bore 24 is interposed 55 incident to wear created by reciprocation of the 2,410,976 3 4 working barrel therein, may be compensated for Obviously, it would be impractical to employ After the packing sleeves have become Worn and consequently shortened to the extent that spring 44 is no longer capable of exerting sufñ cient pressure thereagainst, the weight of the isucker rod string is used to force adjusting sleeve 42 downwardly until the proper spring tension is again obtained, pawls 8U serving to retain the a spring sufficiently long to maintain a substan ltially uniform pressure on sleeves of _such length sleeve in adjusted position. A pump has, therefore„been provided having by reduction in the length of the sleeves through action of spring 44. In actual practice it has been found that sleeves 36 and 38 should be rela tively long, as for example, eighteen inches or more. throughout the period of their usefulness. For this reason, it is desirable to provide for periodi substantially automaticl means for maintaining its working barrel in properly packed condition. cally reloading spring 44 without necessitating Moreover, it has been made possible to reload the spring, used for maintaining the packing in per A preferred structure for accomplishing the fect contact with the working barrel, from the above result includes the adjusting sleeve 42 sur 15 surface of the ground, thus eliminating much rounding the upper end portion of working bar work, loss of time, and expense. removal of the pump assembly from the well. rel 28. This sleeve is provided with a series of While only one embodiment of the pump has annular ratchet teeth 'I6 having upwardly facing been illustrated and described, it is conceivable lateral shoulders 18 for engagement by a plu that modincations might be made thereof without rality of pawls 80 located in slots 82 of nipple 26 20 departing from the spirit of this invention, and and pivotally mounted therein on pins 84. A it is desired therefore, .to be limited only by the circumscrìbing spring 86, clearly shown in Fig. 4 scope of the appended claim. of the drawing, is mounted in an annular groove Having thus described the invention, what I 88 of nipple 26 and contacts the plurality of pawls claim as new and desire to secure by Letters 80 to urge the same into engagement with the 25 Patent is: ratchet teeth 16. The upper end of sleeve 42 Packing structure comprising a fixed tubular is adapted to bear against a lateral flange 9D cylinder; a barrel reciprocably disposed within on nipple 46. the cylinder; spaced apart packing sleeves be Any suitable means may be employed for creat tween the cylinder and said barrel; a spring be ing a sealed relation of the ends of outer cylinder 30 tween said sleeves for urging the same against I4 with lower and upper heads I0 and I2 respec the inner face of the cylinder and the outer face tively, as indicated, for example, at 92. of the barrel; an adjusting sleeve surrounding a The operation of a pump constructed as de portion of the length of the barrel, said adjust scribed is as follows: ‘ Upward movement of working barrel 28 -creates 35 a vacuum in chamber 13 and liquid enters the ing sleeve having a series of annular ratchet teeth on the outer face thereof; a lateral projec tion on the barrel for engaging one end of the sleeve to urge the latter in a direction toward said spring to compress the latter; and a series chamber through strainer I8, bore 14, and stand ing valve 61. As the working barrel returns downwardly the standing valve is closed and ball of pawls pivotally attached to the cylinder for 32 of traveling valve 29 is lifted from its seat 40 radial movement for engaging the said teeth to `to allow iiow of liquid through working barrel 28, lock the adjusting sleeve against movement in check valve 49, `and ducts 58 into tubing 60. a direction from said spring when the pawls are Spring 44, initially loaded to exert a pressure of engaged with any of the teeth, said pawls being approximately two hundred pounds per square so attached to the cylinder as to have their lower inch against packing sleeves 36 and 38 prevents ends free to swing radially toward and from the return leakage of liquid around the outer face teeth on said adjusting sleeve, said pawls having of working barrel 28. As the packing wears, a split annular spring circumscribing vthe series spring 44 expands to maintain Ya perfect contact thereof for drawing the same against the teeth of the packing with the outer circumference of of the adjusting sleeve. the working barrel. ‘ 50 » HARRY F. JOHNS.