Flow-path Structure with Nested Frame for Brazing Assembly
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Solution Overview
Problem
The existing heat exchanger designs, such as those disclosed in JP2014-214955A, face issues with assembling errors due to the lack of engagement between frame-shaped connecting plates and the air-intake-flow-path forming member, leading to potential gaps during the brazing process.
Innovation Solution
A flow-path structure that includes a barrel body and frame bodies with a ring-shaped frame part fitted to the outer surface and inner engagement portions that engage with the inner surface of the barrel body, preventing deformation and separation, thus ensuring proper assembly without gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If frame-shaped connecting plates are used to connect ducts to the air-intake-flow-path forming member, then the structure can be assembled, but the connecting plates cannot prevent inward separation of the flow-path forming member during brazing
Solution Approach 1:
The frame body is divided into two functional segments: the ring-shaped frame part that fits around the outer circumference and the inner engagement portion that extends inward to engage with the inner surface. This segmentation allows each part to perform its specific function - the outer part prevents outward deformation while the inner part prevents inward separation during brazing.
Solution Approach 2:
The inner engagement portion is nested within the ring-shaped frame part, creating a nested structure where the frame body has both outer and inner engagement capabilities. This nested configuration enables the frame body to simultaneously constrain the flow-path forming member from both outward and inward directions during the brazing process.
2Device complexity
If the flow-path forming member is free during brazing, then assembly is simple, but the member deforms outward and creates gaps
Solution Approach 1:
The frame body provides different types of constraints at different locations: the ring-shaped frame part provides outward constraint at the outer circumference, while the inner engagement portion provides inward constraint at the inner surface. This local differentiation of constraint types ensures precise positioning of the flow-path forming member throughout the brazing process.
Data Source
AI summary
A flow-path structure through which fluid flows includes: a barrel body through which fluid flows in an inner circumference; and a frame body configured to connect a flow path member, the flow path member being configured to guide the fluid into the barrel body, wherein the frame body has: a ring-shaped frame part configured to be fitted into an outer surface of the barrel body; and an inner engagement portion configured to engage with an inner surface of the barrel body so as to hold a state in which the outer surface of the barrel body is brought into contact with the frame part.