Heat Exchanger Expansion Valve Assembly Without Welding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing air conditioning systems for motor vehicles face challenges in simplifying the interface between the passenger compartment and the engine compartment, while also requiring a secure and efficient mechanical coupling between the heat exchanger and the expansion valve without the need for welding.
Innovation Solution
The assembly incorporates a junction block and a securing plate with a smooth shank screw having a threaded tip, which securely couples the expansion valve to the heat exchanger, allowing the expansion valve to be positioned closer to the heat exchanger and eliminating the need for welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the expansion valve is positioned close to the heat exchanger inside the air conditioning unit, then the interface between passenger compartment and engine compartment is simplified, but the mechanical coupling requires secure constraint without welding
Solution Approach 1:
The junction block merges multiple functions into a single component: it serves as a mounting structure for the expansion valve, provides fluid passage routing, and acts as a structural support element. This consolidation simplifies the overall assembly and reduces the number of separate parts that would otherwise need to be joined together, thereby reducing interface complexity while maintaining coupling reliability.
Solution Approach 2:
The securing plate acts as an intermediary element between the heat exchanger and the expansion valve assembly. It provides a standardized mounting interface that distributes mechanical loads and secures multiple components (heat exchanger, junction block, expansion valve) simultaneously, eliminating the need for welding while ensuring reliable mechanical coupling.
2Ease of manufacture
If welding is eliminated in favor of mechanical coupling, then manufacturing complexity is reduced, but the number of screws and assembly steps increases
Solution Approach 1:
The securing plate combines multiple fastening functions into a single component, allowing simultaneous attachment of the heat exchanger, junction block, and expansion valve using a limited number of screws. This reduces the total number of fastening operations required compared to traditional multi-component assemblies that would require welding or multiple separate fasteners.
Solution Approach 2:
The securing plate serves multiple functions: it acts as a mounting bracket for the heat exchanger, provides structural support for the junction block, and secures the expansion valve assembly. This multi-functionality reduces the need for additional specialized components, thereby simplifying the overall assembly structure despite eliminating welding.
3Productivity
If a limited number of screws are used to constrain all components, then assembly time is reduced, but the constraint reliability must be maintained
Solution Approach 1:
The securing plate is designed with pre-positioned mounting holes and engagement features that align with the heat exchanger and junction block. This preliminary configuration allows components to be quickly assembled in a single operation without requiring multiple adjustment steps, reducing assembly time while maintaining constraint reliability through precise geometric fitting.
Solution Approach 2:
The securing plate consolidates multiple constraint functions into a single fastening operation. By integrating the mounting of the heat exchanger, junction block, and expansion valve into one unified assembly step using a limited number of screws, it reduces overall assembly time while distributing mechanical loads effectively across all components to maintain constraint reliability.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
An assembly comprising a heat exchanger (10) and an expansion valve (20) for a vehicle, and further comprising a device for coupling the expansion valve (20) to the heat exchanger (10), wherein the coupling device comprises: a junction block (30) coupled to the expansion valve (20) and to the heat exchanger (10); and a securing plate (40) comprising an engagement portion (45a) configured to simultaneously engage flanged portions (12b, 13b) of a first tube (12) and a second tube (13), the securing plate (40) being fixable to the heat exchanger (10) by at least one screw (46) so as to hold the first tube (12), the second tube (13), the expansion valve (20), and the junction block (30) between the heat exchanger (10) and the securing plate (40).