Liquid nitrogen pump

A power end assembly for a multi-cylinder reciprocating plunger pump comprising:

• a frame including a casing defined by spaced apart top and bottom walls, longitudinal sidewalls, and a first end wall defining a transverse flange, said frame including main bearing support means extending from said first end wall and including means defining a plurality of spaced apart bearing support blocks and spaced apart pairs of elongated column members, each pair of column members including a support block;
• a crankshaft assembly supported in said frame including a plurality of eccentrics, each of said eccentrics supporting a reciprocating connecting rod;
• roller bearing assemblies supported in each of said support blocks for journalling said eccentrics, respectively, on opposite sides of each of said connecting rods;
• and
• said crankshaft assembly is further characterized by a separable crankshaft section, and each of said eccentrics has a hub portion removably mounted on and drivenly keyed to said crankshaft section whereby said bearing assemblies can be assembled in supportive relationship to each of said eccentrics on opposite sides thereof, respectively.

In a multi-cylinder reciprocating plunger pump a power end assembly comprising:

• a frame including a casing defined by spaced apart top and bottom walls, longitudinal sidewalls, and a first end wall defining a transverse flange, said frame including main bearing support means extending from said first end wall and including means defining a plurality of spaced apart bearing support blocks for supporting a plurality of main bearings for a rotatable crankshaft assembly;
• a plurality of cylindrical sleeves extending from said flange into the interior of said casing;
• a crosshead member slidably guided in each of said sleeves, respectively;
• said frame including means for supporting said sleeves including transverse support members spaced from and generally parallel to said flange, each of said support members including a bore for receiving a sleeve in supportive relationship thereto, said flange including a plurality of bores aligned with respective bores in said support members for supporting respective ones of said sleeves;
• and
• a removable cover plate secured to said flange for retaining said sleeves in said bores in said flange.

In a multi-cylinder reciprocating plunger pump a power end assembly comprising:

• a frame including a casing defined by spaced apart top and bottom walls, longitudinal sidewalls, and a first end wall defining a transverse flange, said frame including main bearing support means extending from said first end wall and including means defining a plurality of spaced apart bearing support blocks for supporting a plurality of main bearings for a rotatable crankshaft assembly, said support blocks including removable cap portions, and said bearing support means including a plurality of elongated tie rods extending from said flange to said cap portions for securing said cap portions to respective ones of said support blocks;
• a plurality of adaptor members secured to said frame by said tie rods, each of said adaptor members including means for supporting a fluid cylinder and plunger assembly, each of said adaptor members including spaced apart transverse plate portions interconnected by a plurality of spaced apart and generally parallel rod portions, the space between said rod portions providing access to coupling means interconnecting a plunger rod of said cylinder and plunger assembly with a crosshead rod reciprocably supported on said power end assembly;
• a plurality of cylindrical sleeves extending from said flange into the interior of said casing;
• a crosshead member slidably guided in each of said sleeves, respectively;
• said frame including means for supporting said sleeves including transverse support members spaced from and generally parallel to said flange, each of said support members including a bore for receiving a sleeve in supportive relationship thereto;
• a plurality of bores formed in said flange and aligned with respective bores in said support members for supporting respective ones of said sleeves;
• and
• a removable cover plate secured to said flange for retaining said sleeves in said bores in said flange.

A power end assembly for a multi-cylinder reciprocating plunger pump comprising:

• a frame including a casing defined by spaced apart top and bottom walls, longitudinal sidewalls, and a first end wall defining a transverse flange, said frame including main bearing support means for supporting a plurality of main bearings for a rotatable crankshaft assembly;
• a plurality of cylindrical crosshead guide sleeves;
• means on said frame including said flange for supporting said sleeves in such a way that said sleeves extend from said flange into the interior of said casing;
• crosshead members slidably disposed in said sleeves, respectively, said crosshead members each including means forming bearing surfaces for supporting said crosshead members for reciprocation in said sleeves;
• and
• plate means secured to said flange for retaining said sleeves in their supported positions on said frame whereby said sleeves can be inserted in and removed from said casing at said flange and said crosshead members can be inserted in and removed from said sleeves at said flange upon removal of said plate means from said flange.