Direct load wrist pin

Abstract

A wrist pin assembly can include a connecting rod can be pivotably attached to a crank member. A housing can extend between a crank member end and a piston rod end. The connecting rod can extend from the crank member and into the housing through the crank member end. A crosshead can be installed within the housing. The crosshead can be operable to translate within the housing between the crank member end and the piston rod end. A wrist pin can be installed within the crosshead. The connecting rod can be pivotably attached to the wrist pin to translate the wrist pin and the crosshead within the housing in a first direction and a second direction as the crank member rotates. A plunger assembly can be directly coupled to the wrist pin and can extend from the wrist pin through the piston rod end.

1 . A positive displacement reciprocating pump comprising:
 a crank member rotatable about a central axis;   a wrist pin assembly pivotably coupled to the crank member, the wrist pin assembly operable to translate in a first direction and a second direction as the crank member rotates, the wrist pin assembly including:
 a wrist pin; 
   a plunger assembly directly coupled to the wrist pin assembly, the plunger assembly translates along a central axis in the first direction and the second direction as the crank member rotates, the plunger assembly including:
 a pony rod directly connected to the wrist pin; and 
   a pump section pressurized by the plunger assembly moving in the first direction and depressurized by the plunger assembly moving in the second direction.   
     
     
         2 . The positive displacement reciprocating pump of  claim 1 , wherein the wrist pin assembly comprises:
 a connecting rod pivotably attached to the crank member;   a housing extending between a crank member end and a piston rod end, the connecting rod extending from the crank member and into the housing through the crank member end; and   a crosshead installed within the housing, the crosshead operable to translate within the housing between the crank member end and the piston rod end;   wherein the wrist pin is installed within the crosshead, the connecting rod pivotably attached to the wrist pin to translate the wrist pin and the crosshead within the housing in the first direction and the second direction as the crank member rotates.   
     
     
         3 . The positive displacement reciprocating pump of  claim 2 , wherein the connecting rod comprises:
 a crank side section comprising:
 a crank side attachment interface configured to attach the connecting rod to the crank member; and 
   a wrist pin side section, the wrist pin side section opposite the crank side section, the connecting rod extending longitudinally between the crank side section and the wrist pin side section, the wrist pin side section comprising:
 a wrist pin side attachment interface. 
   
     
     
         4 . The positive displacement reciprocating pump of  claim 3 , wherein the wrist pin is installed into the wrist pin side attachment interface to couple the wrist pin to the crosshead. 
     
     
         5 . The positive displacement reciprocating pump of  claim 4 , wherein the crosshead is hollow such that the wrist pin side section of the connecting rod can fit within the crosshead, the crosshead comprising:
 a first aperture; and   a second aperture, the first aperture concentrically aligned with the second aperture such that a vertical axis of the first aperture and the second aperture are orthogonal to the central axis of the crosshead.   
     
     
         6 . The positive displacement reciprocating pump of  claim 5 , wherein at least a portion of the wrist pin extends into the first aperture and the second aperture when the wrist pin is installed within the crosshead. 
     
     
         7 . The positive displacement reciprocating pump of  claim 6 , wherein the wrist pin comprises:
 a pony rod attachment interface extending radially therefrom.   
     
     
         8 . The positive displacement reciprocating pump of  claim 7 , wherein the pony rod is coupled to the pony rod attachment interface of the wrist pin, the pony rod operable to translate in a first direction and a second direction along a longitudinal axis of the pony rod as the crank member rotates. 
     
     
         9 . The positive displacement reciprocating pump of  claim 8 , wherein the plunger assembly comprises:
 a piston rod removably coupled to the pony rod opposite the pony rod attachment interface, the piston rod extending into the pump section to pressurize and depressurize the pump section; and   a clamp configured to couple the piston rod to the pony rod.   
     
     
         10 . The wrist pin assembly of  claim 2 , wherein the connecting rod, the housing, the crosshead, and the plunger assembly are installed substantially horizontally. 
     
     
         11 . A wrist pin assembly comprising:
 a connecting rod pivotably attached to a crank member;   a housing extending between a crank member end and a piston rod end, the connecting rod extending from the crank member and into the housing through the crank member end;   a crosshead installed within the housing, the crosshead operable to translate within the housing between the crank member end and the piston rod end;   a wrist pin installed within the crosshead, the connecting rod pivotably attached to the wrist pin to translate the wrist pin and the crosshead within the housing in a first direction and a second direction as the crank member rotates; and   a plunger assembly directly coupled to the wrist pin and extending from the wrist pin through the piston rod end, the plunger assembly translates along a central axis in the first direction and the second direction as the crank member rotates.   
     
     
         12 . The wrist pin assembly of  claim 11 , wherein the connecting rod comprises:
 a crank side section, the crank side section comprising:
 a crank side attachment interface configured to attach the connecting rod to the crank member; and 
   a wrist pin side section, the wrist pin side section opposite the crank side section, the connecting rod extending longitudinally between the crank side section and the wrist pin side section, the wrist pin side section comprising:
 a wrist pin side attachment interface. 
   
     
     
         13 . The wrist pin assembly of  claim 12 , wherein the wrist pin is installed into the wrist pin side attachment interface to couple the wrist pin to the crosshead. 
     
     
         14 . The wrist pin assembly of  claim 13 , wherein the crosshead is hollow such that the wrist pin side section of the connecting rod can fit within the crosshead, the crosshead comprising:
 a first aperture; and   a second aperture, the first aperture being concentrically aligned with the second aperture such that a vertical axis of the first aperture and the second aperture are orthogonal to the central axis of the crosshead.   
     
     
         15 . The wrist pin assembly of  claim 14 , wherein at least a portion of the wrist pin extends into the first aperture and the second aperture when the wrist pin is installed within the crosshead. 
     
     
         16 . The wrist pin assembly of  claim 11 , wherein the wrist pin comprises:
 a pony rod attachment interface extending radially therefrom.   
     
     
         17 . The wrist pin assembly of  claim 16 , wherein the plunger assembly comprises:
 a pony rod directly coupled to the pony rod attachment interface of the wrist pin, the pony rod operable to translate in the first direction and the second direction along a longitudinal axis of the pony rod as the crank member rotates.   
     
     
         18 . The wrist pin assembly of  claim 17 , wherein the plunger assembly comprises:
 a piston rod removably coupled to the pony rod opposite the pony rod attachment interface of the wrist pin, the piston rod extending and retracting with the pony rod; and   a clamp configured to couple the piston rod to the pony rod.   
     
     
         19 . The wrist pin assembly of  claim 11 , wherein the connecting rod, the housing, the crosshead, and the plunger assembly are installed substantially horizontally. 
     
     
         20 . The wrist pin assembly of  claim 11 , wherein the housing is fluidically sealed.