Hoerbiger Wien Gmbh

Andreas Kaufmann

Martin Lagler

Guido Pratelli

Marian Janko-Grasslober

Bernhard Spiegl

Matthias Kornfeld

In order to provide a sealing device () for sealing a piston rod () of a reciprocating compressor () at compressor standstill, which enhances the safety of operation, the sealing device () comprises a number of first packing retainers (), each retainer including a retaining opening () in which a first packing ring () is arranged, a second packing retainer (), including a retaining opening () in which a second packing ring () is arranged, the second retainer () being positioned closer to the second axial device end () than the number of first packing retainers () in an axial direction of the sealing device (), wherein the second packing ring () is an uncut ring, comprising a continuous inner circumferential sealing surface (), the second packing ring () being configured to seal the piston rod () at standstill of the compressor (), wherein the sealing device () further comprises a support passage () having a first support passage end (), a second support passage end () and a valve () for opening and closing the support passage (), the support passage () being configured to vent at least a gas, leaking from the first axial device end () in the direction of the second axial device end () past at least one of the number of first packing rings (), from the first support passage end () to the second support passage end (), wherein the sealing device () further comprises an unobstructed vent passage () having a first vent passage end () and a second vent passage end (), the vent passage () being configured to vent a gas, leaking from the first axial device end () in the direction of the second axial device end () past the second packing ring (), from the first vent passage end () to the second vent passage end ().

Sealing device for a piston rod of a reciprocating compressor

In order to provide a sealing device () for sealing a piston rod () of a reciprocating compressor (), which provides good sealing properties at compressor standstill, which has a simple structure, which allows for a simple handling and which requires no external source of energy, the sealing device () comprises a number of first packing retainers (), each retainer including a retaining opening () in which a first packing ring () is arranged, a second packing retainer (), including a retaining opening () in which a second packing ring () is arranged, the second retainer () being positioned closer to the second axial device end () than the number of first packing retainers () in an axial direction of the sealing device (), wherein the second packing ring () is an uncut ring, comprising a continuous inner circumferential sealing surface (), wherein the second packing ring () is made from a material comprising a polymer, the material having a thermal expansion coefficient (α), which is at least two times higher than the thermal expansion coefficient (αFE) of iron, wherein at or below a defined activation temperature an inner diameter (d_i) of the second packing ring () is smaller than an outer diameter (D_a) of the piston rod () to be sealed, such that in the mounted state of the sealing device () in the compressor () the second packing ring () is prestressed in a radial direction in order to form a tight seal between the continuous inner circumferential sealing surface () of the second packing ring () and the outer circumferential surface () of the piston rod (), wherein at a given operating temperature, the inner diameter (d_i) of the second packing ring () is larger than the outer diameter (D_a) of the piston rod (), such that in the mounted state of the sealing device () in the compressor () the continuous inner circumferential sealing surface () of the second sealing ring () is detached from the outer circumferential surface () of the piston rod () in order to provide a leakage path past the second packing ring () in the axial direction.

Various embodiments of the present disclosure are directed to packing rings. In one example embodiment, a packing ring is disclosed including first and second axial ring ends, at least three ring segments, and at least three relief openings. The at least three relief openings each have a first relief opening end opening into the radially inside inner circumferential surface of the ring segment. The first relief opening ends of two relief openings arranged adjacent to one another in the circumferential direction are spaced apart from one another at a relief opening circumferential distance. The first relief opening ends are closer in the axial direction to the first axial ring end than to the second axial ring end and are spaced apart at a relief opening axial distance from the first axial ring end, which is 4% to 20% of the axial ring width of the ring segment.

Packaging ring with relief opening

A scraper ring is provided with a plurality of sealing sections on the radially inner circumferential surface, each including a scraping edge, wherein the sealing sections are spaced axially apart from each other by inner circumferential grooves, with at least one recess provided on the circumference of the scraper ring which extends at least partially from a first axial ring end to a second axial ring end and extends at least partially in a direction different from the axial direction of the scraper ring. At least one drainage opening is provided on the outer circumferential surface of the scraper ring, which is connected to at least one inner circumferential groove for removing scraped oil from the inner circumferential grooves.

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Vienna, Austria

Andreas Kaufmann