US 2026/0146594 A1Published application

Wiper ring for reciprocating compressor rod packing

AssigneeCompressor Products International LLC (Cpi)

InventorPascal Mahieux

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Abstract

A rod packing assembly that includes a wiper ring is disclosed. In one embodiment, a rod packing assembly comprises a first ring, a second ring, a third ring, a first biasing member, a second biasing member, and a third biasing member. The third ring has at least one port, and is positioned between the first ring and the second ring. The first ring, the second ring, and the third ring surround a rod and to scrape a surface of the rod. The first biasing member applies a first force to urge the first ring against the rod, and the second biasing member applies a second force to urge the second ring against the rod. The third biasing member applies at least a third force to urge the third ring against the rod. The first and second rings are arranged to apply forces to urge the third ring against the rod.

Claims20

Dependent claims

A rod packing assembly comprising:

a first ring;
a second ring;
a third ring including at least one port defined therein, wherein the third ring is coupled to the first ring and to the second ring, the third ring being positioned between the first ring and the second ring, and wherein the first ring, the second ring, and the third ring are configured to surround a rod and to collectively scrape a surface of the rod;
a first biasing member, the first biasing member being arranged around the first ring, wherein the first biasing member applies a first force to the first ring to urge the first ring against the rod and against the third ring, thereby urging the third ring against the rod;
a second biasing member, the second biasing member being arranged around the second ring, wherein the second biasing member applies a second force to the second ring to urge the second ring against the rod and against the third ring, thereby urging the third ring against the rod;
and
at least one third biasing member, the at least one third biasing member being arranged around the third ring wherein an outer diameter of the first biasing member or an outer diameter of the second biasing member overlaps the outer diameter of the at least one third biasing member, wherein the at least one third biasing member applies at least a third force to the third ring to urge the third ring against the rod.

4 more elements

A reciprocating compressor comprising:

a piston assembly including a piston and a piston rod;
a crankcase, the crankcase containing a crankshaft and oil, wherein the piston rod is coupled to the piston and to the crankshaft, wherein the oil coats the piston rod;
and
a wiper ring positioned around the piston rod such that the piston rod moves along a first axis through the wiper ring, the wiper ring being arranged to scrape a surface of the piston rod to remove the oil from the piston rod as the piston rod moves along the first axis, the wiper ring including:
a first outer ring,
a second outer ring,
an inner ring sandwiched between the first outer ring and the second outer ring, the inner ring having a plurality of ports defined therein, and
a plurality of biasing elements, the plurality of biasing elements including a first biasing member arranged to apply a first inward force to urge the first outer ring against the piston rod, a second biasing member arranged to apply a second inward force to urge the second outer ring against the piston rod, and at least one third biasing member arranged to apply a third inward force to urge the inner ring against the piston rod, wherein an outer diameter of the first biasing member or an outer diameter of the second biasing member overlaps the outer diameter of the at least one third biasing member, wherein the first inward force and the second inward force also urge the inner ring against the piston rod, and wherein the oil removed from the piston rod is provided to the inner ring and directed through the plurality of ports.

5 more elements

A reciprocating compressor comprising:

a piston assembly including a piston and a piston rod;
a crankcase, the crankcase containing a crankshaft and oil, wherein the piston rod is coupled to the piston and to the crankshaft, wherein the oil coats the piston rod;
and
a packing ring assembly positioned around the piston rod such that the piston rod moves along a first axis through the packing ring assembly, the packing ring assembly having a plurality of scraping surfaces arranged to be forced against a surface of the piston rod by an inward radial force imposed by a plurality of biasing members that are arranged around outer diameters of packing rings in the packing ring assembly and arranged so that at least two of the plurality of biasing members at least partially overlap, wherein the inward radial force urges the plurality of scraping surfaces to scrape the surface of the piston rod to remove the oil from the piston rod as the piston rod moves along the first axis, the packing ring assembly further being arranged to capture the oil removed from the piston rod and to direct the oil removed from the piston rod through the packing ring assembly to return the oil removed from the piston rod to the crankcase.

1 more element

Dependencies are inferred from the claim text.