Vehicle Heater Heat Exchanger Layout for Easier Assembly
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Solution Overview
Problem
Existing heat exchanger designs for vehicle heaters are complex and difficult to manufacture, with interference between housing parts and inefficient heat transfer due to the placement of waste gas flow connecting pieces within the heat carrier medium flow space.
Innovation Solution
A pot-like heat exchanger housing design with strategically placed heat carrier medium flow connecting pieces and a waste gas flow connecting piece, allowing for a simpler manufacturing process and preventing interference between housing parts, while keeping the waste gas flow connecting piece outside the heat carrier medium flow space to simplify manufacturing and reduce thermal stress on components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the waste gas flow connecting piece is placed within the heat carrier medium flow space, then heat transfer efficiency is improved, but manufacturing complexity increases and thermal stress on components increases
Solution Approach 1:
The waste gas flow connecting piece is repositioned from the radial direction (within the heat carrier medium flow space) to the axial direction (outside the heat carrier medium flow space). This dimensional change allows the connecting piece to pass through the inner circumferential wall at the end area rather than through the intermediate space, resolving the contradiction by maintaining heat transfer efficiency while simplifying manufacturing and reducing thermal stress on non-essential parts.
2Ease of operation
If the waste gas flow connecting piece passes through the ring-like intermediate space, then connection to interior space is achieved, but interference between housing parts occurs and manufacturing becomes difficult
Solution Approach 1:
The heat exchanger housing is divided into outer and inner housing parts with distinct functional zones. The waste gas flow connecting piece is assigned to pass through the inner circumferential wall at the end area, separating its path from the intermediate space between housing parts. This segmentation eliminates interference between housing parts during assembly while maintaining connection capability to the interior space.
3Ease of operation
If the heat carrier medium flow connecting pieces are placed at the outer circumferential wall, then heat carrier medium flow connection is achieved, but thermal stress on outer housing part increases
Solution Approach 1:
The heat carrier medium flow connecting pieces are extracted from the outer circumferential wall and repositioned to the inner circumferential wall in the end area. This extraction removes the thermal stress burden from the outer housing part, as the connecting pieces now pass through the inner housing part which is better positioned to handle thermal loads from the combustion chamber.
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 design enables a simpler and more efficient manufacturing process, reduces thermal stress on components, and maintains effective heat transfer by separating the waste gas flow connecting piece from the heat carrier medium flow space, allowing for easier assembly and reduced thermal exposure on non-essential parts.
Implementation Method 1
the inner heat exchanger housing can absorb heat from the combustion waste gases and can transfer this to heat carrier medium flowing in the heat carrier medium flow space
Data Source
AI summary
A heat exchanger arrangement, especially for a vehicle heater, includes a pot-like heat exchanger housing (12) extending in the direction of a longitudinal axis (L) of the housing. The heat exchanger housing includes an outer housing part (14) with the outer circumferential wall (18) and with an outer bottom wall (20) as well as an inner housing part (16) with the inner circumferential wall (22) and with an inner bottom wall (24). A heat carrier medium flow connecting piece (50, 52), open towards the heat carrier medium flow space, is provided at an axial end area (44) of the outer circumferential wall of the outer housing part, the end area being located at a distance from the outer bottom wall. A waste gas flow connecting piece (30) is open towards an interior space (26) of the heat exchanger housing, which interior space is enclosed by the inner wall.