Layered Cylinder Head Cooling for Reciprocating Piston Compressors
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Solution Overview
Problem
Reciprocating piston machines for compressing fluid in motor vehicle systems face inefficiencies in cooling, particularly in the top dead center region where waste heat is highest, leading to increased oil ejection rates and reduced compressor performance.
Innovation Solution
A layered cylinder head design with integrated cooling and outlet channels that extend through the cylinder housing, forming heat exchanger regions with alternating cooling and outlet channels to enhance cooling efficiency, and a valve tappet mechanism for idling operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional cooling channel is provided in the cylinder head, then the compressed air can be cooled, but the cooling efficiency is insufficient particularly in the top dead center region where waste heat is highest
Solution Approach 1:
The cylinder head is divided into multiple functional layers (valve carrier element, chamber plate, head plate) with cooling channels distributed across different levels. This segmentation allows targeted cooling of specific high-heat regions, particularly the top dead center area, by placing cooling channels at optimal positions within each layer to maximize heat removal efficiency.
Solution Approach 2:
The cooling channels are extended from a single-plane configuration into a multi-dimensional network that penetrates through multiple layers of the cylinder head structure. By routing channels through the valve carrier element, chamber plate, and head plate at different depths and orientations, the cooling system accesses heat sources in three-dimensional space, significantly improving cooling coverage in the top dead center region.
2Loss of substance
If the heat development in the top dead center region is too high, then the oil ejection rate increases, but additional cooling measures increase device complexity
Solution Approach 1:
The cooling channels are integrated directly into the layered cylinder head structure itself, merging the cooling function with the structural components. The valve carrier element, chamber plate, and head plate each incorporate cooling channels as integral parts, eliminating the need for separate external cooling assemblies and reducing overall device complexity while effectively controlling oil ejection through targeted cooling.
Solution Approach 2:
The layered cylinder head components serve multiple functions simultaneously: they provide structural support for valves and pistons while also acting as heat exchangers with embedded cooling channels. This multi-functionality allows the same structural elements to perform both mechanical and thermal management roles, reducing the number of separate components needed and simplifying the overall system while controlling oil ejection rates.
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
This design improves cooling efficiency by effectively managing waste heat, reducing oil ejection rates, and enhancing the overall performance of the compressor by optimizing the flow of cooling medium and compressed air.
Implementation Method 1
a cooling medium channel for cooling at least a partial region of the cylinder head
Implementation Method 2
a heat exchanger region is provided in the cylinder housing, wherein at least a partial portion of the cooling medium channel and a partial portion of the outlet channel run through said region
Data Source
AI summary
A reciprocating piston machine for compressing a fluid, more particularly ambient air, for a compressed air system of a motor vehicle, includes a cylinder housing and a cylinder head constructed layer by layer and including a valve carrier element with an outlet valve, a chamber plate and a head plate with a pressure medium outlet. A cooling medium channel for cooling at least a partial region of the cylinder head and an outlet channel for connecting the outlet valve to the pressure medium outlet are provided and extend through components of the cylinder head, at least in portions. In order to improve the cooling, at least a partial portion of the cooling medium channel and a partial portion of the outlet channel are allocated to the cylinder housing.