Wafer stuffing box

Abstract

A low-profile wafer stuffing box includes a plurality of replaceable seals located within a single, unitary body. The body includes a central bore with a plurality of internal channels, a first internal channel located proximate a top surface of the body, a second internal channel located proximate a bottom surface of the body, and a third internal channel being located between the first internal channel and the second internal channel. An internal fluid corridor extends from the front wall through the stuffing box body and into the third internal channel. The low-profile wafer stuffing box may be used on reciprocating piston pumps.

1 . A reciprocating piston pump comprising:
 a riser pipe;   a well head attached to the riser pipe;   a sucker rod disposed within the riser pipe and extending through the well head, the sucker rod having a piston attached thereto;   an actuator having an actuator rod operatively coupled to a ball screw, at least a portion of the ball screw being disposed within the actuator rod;   a motor connected to the actuator and operatively coupled to the ball screw, the motor rotating the ball screw within the actuator rod; and   a wafer stuffing box disposed between the well head and the actuator, the wafer stuffing box including a stuffing box body and a central bore running through the stuffing box body, the central bore including an internal channel;   wherein the actuator rod is connected to the sucker rod by a connection fitting, the actuator rod having an outer diameter that is greater than or equal to an outer diameter of the connection fitting, and the central bore has an inner diameter that is substantially equal to the outer diameter of the actuator rod.   
     
     
         2 . The reciprocating piston pump according to  claim 1 , further comprising a plurality of inner channels within the central bore of the wafer stuffing box. 
     
     
         3 . The reciprocating piston pump according to  claim 1 , wherein one side of the wafer stuffing box body comprises a recessed channel. 
     
     
         4 . The reciprocating piston pump according to  claim 3 , further comprising a resilient seal disposed in the recessed channel. 
     
     
         5 . The reciprocating piston pump according to  claim 1 , further comprising a seal disposed in the inner channel. 
     
     
         6 . The reciprocating piston pump according to  claim 1 , wherein the wafer stuffing box includes a zerk fitting fluidly connected to an internal corridor, the internal corridor being fluidly connected to the internal channel for transferring a lubricant into the central bore. 
     
     
         7 . The reciprocating piston pump according to  claim 1 , comprising a plurality of inner channels in the central bore. 
     
     
         8 . A low-profile wafer stuffing box for a reciprocating piston pump, the low-profile wafer stuffing box comprising:
 a stuffing box body having a first side, a second side, a front wall, a rear wall, and a pair of side walls;   a central bore extending through the stuffing box body from the first side to the second side;   a plurality of internal channels within the central bore, a first seal disposed in a first internal channel and a second seal disposed in a second internal channel, a third internal channel being disposed between the first internal channel and the second internal channel;   an internal fluid corridor extending from the front wall through the stuffing box body and into the third internal channel.   
     
     
         9 . The reciprocating piston pump according to  claim 8 , wherein the one of the first and second seals comprises an inverted channel. 
     
     
         10 . The reciprocating piston pump according to  claim 9 , wherein the inverted channel comprises two angled sidewalls connected by a channel floor. 
     
     
         11 . The reciprocating piston pump according to  claim 10 , wherein the channel floor is oriented substantially perpendicular to a longitudinal axis of the central bore. 
     
     
         12 . The reciprocating piston pump according to  claim 10 , further comprising a semi-rigid insert disposed in the inverted channel. 
     
     
         13 . The reciprocating piston pump according to  claim 12 , wherein the semi-rigid insert comprises a segmented metal ring. 
     
     
         14 . The reciprocating piston pump according to  claim 9 , wherein the inverted channel comprises a pair of angled sidewalls that meet in a center of the inverted channel. 
     
     
         15 . The reciprocating piston pump according to  claim 14 , further comprising an outer shelf connected to an angled surface, the outer shelf being oriented substantially perpendicular to a longitudinal axis of the wafer stuffing box. 
     
     
         16 . The reciprocating piston pump according to  claim 8 , further comprising a recessed channel on one side of the stuffing box body. 
     
     
         17 . The reciprocating piston pump according to  claim 16 , wherein the first internal channel includes a rod wiper seal and the second internal channel includes a scraper seal. 
     
     
         18 . The wafer stuffing box of  claim 16 , further comprising a resilient seal disposed within the recessed channel. 
     
     
         19 . The wafer stuffing box of  claim 18 , further comprising a zerk fitting disposed on the front wall, the zerk fitting being fluidly connected to the internal fluid corridor. 
     
     
         20 . A wafer stuffing box for a reciprocating piston pump, the wafer stuffing box comprising:
 a body including a top side, a bottom side, a front wall, a rear wall, and a pair of side walls;   a central opening extending through the body from the top side to the bottom side;   a plurality of internal channels disposed within the central opening, a first internal channel being located near the top side of the body, a second internal channel being located near a bottom side of the body, and a third internal channel being located between the first and second internal channels;   an internal corridor extending from the front side to the third internal channel, the internal corridor being capable of transporting a lubricant into the third internal channel;   a rod scraper seal disposed in the second internal channel, the rod scraper seal including an inner cylindrical surface, an outer cylindrical surface, and an inverted scraper channel on a bottom of the rod scraper seal between the inner cylindrical surface and the outer cylindrical surface;   a semi-rigid insert disposed within the inverted scraper channel;   a rod wiper seal disposed in the first internal channel, the rod wiper seal including an inner cylindrical surface and an outer cylindrical surface, the inner cylindrical surface being longer than the outer cylindrical surface along a longitudinal axis of the rod wiper seal, an outer ledge connected to a top end of the outer cylindrical surface, and an angled surface connecting the outer ledge to the inner cylindrical surface;   an external channel disposed on the bottom side of the body, the external channel surrounding the central opening; and   a resilient seal disposed within the external channel.