Piston Rod Cavity Filled with High Thermal Conductivity Solid
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Solution Overview
Problem
Piston compressors without oil lubrication face challenges in maintaining low wear rates and effective cooling of piston rod seals due to increased friction and temperature, leading to premature failure, and existing actively cooled piston rods are complex, costly, and maintenance-intensive.
Innovation Solution
A piston rod with cavities filled with solids having higher thermal conductivity than the base material, such as copper or aluminum, to enhance heat dissipation and reduce temperature gradients, eliminating the need for liquid cooling systems and complex peripherals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If piston compressors use oil lubrication to minimize frictional forces, then wear rates of sealing elements are reduced and service life is extended, but lubricants are dissolved in the compressed gases or liquids making them unsuitable for sensitive media
Solution Approach 1:
The invention extracts and eliminates the lubrication function from the sealing system by using self-lubricating plastic materials that inherently provide low friction without requiring external oil lubrication. This removes the source of media contamination while maintaining the necessary tribological performance.
Solution Approach 2:
The invention changes the material parameters of the sealing elements by using filled polymers with specific tribological properties. The filling materials (such as PTFE, graphite, or solid lubricants) fundamentally alter the friction and wear characteristics, enabling oil-free operation with acceptable wear rates.
2Object-affected harmful factors
If piston compressors use dry lubrication with plastic-based sealing elements, then compressed media remain uncontaminated, but frictional heat increases leading to higher temperatures at contact points
Solution Approach 1:
The invention introduces thermally conductive filling materials (such as metal powders, ceramic particles, or graphite) as intermediaries within the plastic matrix. These fillers act as heat sinks and thermal pathways, conducting heat away from the contact points while maintaining the oil-free sealing function.
Solution Approach 2:
The invention uses composite plastic materials combining a polymer matrix with thermally conductive fillers. This composite structure provides both the necessary sealing properties and enhanced thermal management, dissipating frictional heat more effectively than pure plastics while maintaining oil-free operation.
3Temperature
If actively cooled piston rods with liquid cooling systems are used to dissipate frictional heat, then temperature at contact points is reduced, but device complexity and maintenance requirements increase
Solution Approach 1:
The invention makes the piston rod self-cooling by incorporating thermally conductive materials directly into the rod structure. The rod itself becomes the heat dissipation pathway, eliminating the need for external cooling systems, pumps, and complex infrastructure while maintaining effective temperature control.
Solution Approach 2:
The piston rod is constructed as a composite structure with a metal base body and thermally conductive filler materials or coatings. This composite design enhances the thermal conductivity of the rod, enabling passive heat dissipation through the rod's own structure without requiring active cooling systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides efficient cooling of piston rod seals, reduces wear rates, extends service life, and simplifies manufacturing and maintenance while reducing costs by utilizing high thermal conductivity materials to effectively dissipate heat and maintain low friction.
Implementation Method 1
Much of the frictional heat introduced is transported via heat conduction along the piston rod from the area of the seal packing to an area remote from the seal packing
Implementation Method 2
the cavity is filled with a solid whose specific thermal conductivity is greater than that of the base body
Data Source
Figure 1
Figure 2a
Figure 2b
AI summary
The present invention relates to a piston rod (20) for piston compressors (10), wherein the piston rod (20) comprises a base body (21) with an end facing the piston, an end facing away from the piston, and at least one cavity (24). This piston rod (20) is characterized in that the cavity (24) is filled with a solid (26) whose specific thermal conductivity is greater than that of the material of the base body (21). Furthermore, the invention relates to a piston compressor (10) with a piston (12) and an unlubricated piston rod seal (13), wherein the piston (12) is connected to a piston rod according to claim 1.