Multi-Disc Oil Wiper Packing for Piston Rod Oil Sealing
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Solution Overview
Problem
Crosshead piston compressors suffer from continuous oil loss and contamination due to lubricating oil passing through the oil wiper packing, which can damage the mechanism and contaminate compressed fluid.
Innovation Solution
An oil wiper packing system comprising multiple chamber discs with wiper rings, where each disc has a recess and a partition wall with a bore, allowing the piston rod to pass through, and wiper rings are arranged in each recess to prevent oil propagation, with the play between the wiper ring and chamber disc preconfigured to ensure optimal sealing and minimize oil transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single chamber disc with wiper ring is used, then the structure is simple, but lubricating oil passes through continuously causing oil loss and contamination
Solution Approach 1:
The oil wiper packing is divided into multiple chamber discs (at least two) arranged in series along the running direction of the piston rod. Each chamber disc contains a wiper ring that contacts the piston rod surface. This segmentation creates multiple sealing stages, where oil is progressively wiped off at each stage, preventing continuous oil passage through the packing while maintaining a manageable structural complexity.
2Reliability
If multiple chamber discs are arranged successively, then oil transfer is prevented, but the installation complexity increases
Solution Approach 1:
Multiple chamber discs are connected together to form an integrated oil wiper packing assembly. The chamber discs are arranged successively in the running direction and connected via connecting elements (such as screws or clips) that pass through alignment holes. This merging approach maintains reliable oil sealing performance by creating multiple sealing stages, while simplifying installation compared to separate components by providing a pre-assembled unit that can be installed as one piece.
3Ease of manufacture
If wiper ring play is not preconfigured, then manufacturing is easier, but optimal sealing and minimal oil transfer cannot be ensured
Solution Approach 1:
The play between the wiper ring and chamber disc is preconfigured during manufacturing to specific dimensional tolerances. The chamber disc recess is designed with precise dimensions relative to the wiper ring, ensuring optimal contact pressure and sealing performance. This preliminary configuration of dimensional parameters during manufacturing ensures minimal oil transfer and optimal sealing without requiring complex adjustment mechanisms during installation or operation.
Data Source
AI summary
An oil wiper packing for a piston rod of a crosshead piston compressor, and corresponding assembly method. The oil wiper packing has at least one chamber disc having a chamber disc cutout, wherein a wiper ring arranged in the chamber disc cutout. At least two chamber discs, each having a chamber disc cutout, are arranged in succession in a direction of extent (L), and a single wiper ring is in each chamber disc cutout. Each wiper ring has no play or only negligible play in the direction of extent (L) in the operating state but is movable in the radial direction. It is necessary to set the play in in the cold state during the assembly of the wiper rings. Such an arrangement allows advantageous wiping of oil, preventing oil from spreading in the direction of extent of the piston rod.