Parallel Exhaust Heat Recovery Valve Layout for Compact Mounting
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Solution Overview
Problem
Conventional exhaust heat recovery apparatuses for vehicles are bulky and heavy due to their design, which limits their ease of assembly and mounting due to interference with other components.
Innovation Solution
The apparatus features a housing with a slide gate that moves longitudinally to switch exhaust gas flow between two passages, reducing volume and weight, and includes a heat exchanger with a tube bundle and a drive mechanism using a wax actuator to control the slide gate's position based on cooling fluid temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a disc-type or flap-type valve member is used in the switching valve, then the exhaust gas flow can be switched between passages, but the size and weight of the apparatus increase
Solution Approach 1:
The exhaust passages are divided into multiple parallel paths (first and second exhaust passages) with a heat exchanger disposed in one path. The slide gate segments the flow distribution between these parallel passages, allowing selective routing of exhaust gas to achieve heat recovery or bypass functionality.
Solution Approach 2:
The switching valve employs a slide gate that moves linearly between different positions to dynamically control exhaust gas flow distribution. This dynamic positioning mechanism replaces traditional disc or flap valves, enabling flexible flow switching while reducing overall apparatus size and weight.
2Ease of operation
If a disc-type or flap-type valve member is used in the switching valve, then the exhaust gas flow can be switched between passages, but the volume of the apparatus increases
Solution Approach 1:
The switching valve and flow control functionality are merged into a compact linear slide gate mechanism that operates within the existing passage structure. This integration eliminates the need for separate valve bodies and complex actuation mechanisms required by disc or flap valves, significantly reducing apparatus volume.
Solution Approach 2:
The linearly movable slide gate provides dynamic flow control within a compact space, replacing the larger spatial requirements of traditional rotational disc valves or flap mechanisms. This dynamic linear motion enables efficient flow switching with minimal volume occupation.
3Device complexity
If the switching valve is disposed adjacent to one end portion of the housing, then the valve structure is simplified, but the layout flexibility is reduced due to increased size
Solution Approach 1:
The linearly movable slide gate provides dynamic flow control within a compact space, replacing the larger spatial requirements of traditional rotational disc valves or flap mechanisms. This dynamic linear motion enables efficient flow switching with minimal volume occupation.
Solution Approach 2:
The slide gate moves in a longitudinal direction parallel to the exhaust gas flow, utilizing the length dimension of the housing rather than occupying lateral space. This dimensional approach to valve design reduces interference with peripheral components and improves mounting layout flexibility.
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 enhances the ease of assembly and mounting by reducing the apparatus's volume and weight, allowing for more flexible layout and improved heat recovery efficiency.
Implementation Method 1
a heat exchanger disposed within the first exhaust passage
Implementation Method 2
a cooling fluid channel through which a coolant or the like passes, and an exhaust gas channel through which the exhaust gas passes
Implementation Method 3
a wax actuator selectively rotating the cam member
Data Source
AI summary
An exhaust heat recovery apparatus includes: a housing having a first exhaust passage and a second exhaust passage, an exhaust inlet fitting, and an exhaust outlet fitting; a heat exchanger disposed in the first exhaust passage; and a switching valve having a slide gate which is movable in a longitudinal direction of the housing so as to allow a flow of exhaust gases to be switched between the first exhaust passage and the second exhaust passage, wherein the first exhaust passage is parallel to the second exhaust passage, and the slide gate is movable between the first exhaust passage and the second exhaust passage.