The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 10, 2025
Filed:
Nov. 16, 2022
Hoerbiger Wien Gmbh, Vienna, AT;
Hoerbiger Wien GmbH, Vienna, AT;
Abstract
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.