Heat Exchanger Guide Member for Backflow Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing heat exchangers face challenges in suppressing backflow of exhaust gases during heat recovery suppression, leading to reduced heat insulation performance due to pressure differences and flow separation issues.
Innovation Solution
A heat exchanger design featuring a hollow pillar-shaped honeycomb structure with specific cylindrical members and a guide member configuration, including an inclined portion and communication ports, which reduces pressure differences and prevents backflow by controlling flow paths and pressure distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the heat exchanger constantly collects waste heat from the first fluid to the second fluid, then heat recovery efficiency is improved, but the radiator capacity must be increased to discharge the collected waste heat when heat exchange is not needed
Solution Approach 1:
The patent introduces a valve that can open and close the rear end of the inner pipe, dynamically switching between heat recovery mode and non-recovery mode. This allows the system to adapt to different operational conditions, collecting waste heat when needed and preventing unnecessary heat collection when not needed, thereby avoiding the need for oversized radiator capacity.
2Loss of energy
If the valve is opened to suppress heat recovery, then heat insulation performance is improved, but exhaust gas backflow occurs due to pressure differences
Solution Approach 1:
The patent introduces an inclined portion in the guide member that creates asymmetric flow resistance. The inclination allows exhaust gas to flow easily in the forward direction while creating resistance to backflow. This asymmetric structure enables the system to maintain pressure equilibrium and prevent backflow even when the valve is opened for heat insulation.
3Ease of operation
If the inner pipe extends to the rear side to allow exhaust gas flow, then exhaust gas routing is improved, but flow separation occurs leading to backflow issues
Solution Approach 1:
The patent introduces a guide member as an intermediary component between the inner pipe and the external environment. The guide member, particularly with its inclined portion, acts as a mediator that directs exhaust gas flow smoothly and prevents flow separation. This intermediary structure stabilizes the flow path and prevents backflow while maintaining effective exhaust gas routing.
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 effectively suppresses backflow and enhances heat insulation performance by maintaining pressure equilibrium and directing flow paths to prevent reverse flow during heat recovery suppression.
Implementation Method 1
a heat exchanger which performs heat exchange between a first fluid and a second fluid by allowing the first fluid to flow inside and the second fluid to flow outside
Implementation Method 2
exchanging the heat from the first fluid having a higher temperature (for example, an exhaust gas) to the second fluid having a lower temperature (for example, cooling water)
Data Source
AI summary
A heat exchanger includes: a hollow pillar shaped honeycomb structure; a first cylindrical member fitted to a surface of an outer peripheral wall of the pillar shaped honeycomb structure; a second cylindrical member fitted to a surface of an inner peripheral wall of the pillar shaped honeycomb structure; a cylindrical guide member having a portion, the portion being disposed on a radially inner side of the second cylindrical member with a distance so as to form the flow path for the first fluid;an upstream cylindrical member connecting an upstream end of the first cylindrical member to an upstream side of the guide member; and a downstream cylindrical member connected to a downstream end of the first cylindrical member. The guide member includes an inclined portion that inclines to its downstream side.