Brazed Tube Joint Structure for Controlled Filler Protrusion
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Solution Overview
Problem
The existing joint members for connecting tubes through which a fluid flows face issues with inconsistent protrusion of brazing material, leading to potential leaks and surface irregularities when joined by brazing, as the range of brazing material protrusion can vary significantly.
Innovation Solution
A joint member design featuring a joint main body with a flow path and an opening portion of larger inner diameter, a step portion, and a tube member with an annular recessed portion, where the tube member is inserted into the joint main body and brazed, preventing the brazing material from spreading excessively along the outer peripheral surface by containing it within the recessed area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the joint main body and tube member are joined by brazing without additional structural features, then the joining process is simple, but the range in which the brazing material protrudes from the joint portion varies significantly
Solution Approach 1:
The annular recessed portion is pre-formed on the tube member before brazing, creating a predetermined containment structure that guides and limits the flow of brazing material during the joining process, ensuring consistent protrusion range
Solution Approach 2:
The recessed portion creates a localized region with different geometric properties (deeper depth) compared to the surrounding tube member surface, concentrating and controlling the brazing material accumulation in a specific area rather than allowing random distribution
2Device complexity
If the tube member surface is left without a recessed portion, then the manufacturing process is simpler, but surface irregularities and potential leaks occur due to uncontrolled brazing material spreading
Solution Approach 1:
The recessed portion transforms the potentially harmful effect of brazing material spreading (which causes surface irregularities and leaks) into a beneficial containment mechanism, where the same material accumulation is directed into a controlled depression that maintains surface smoothness and connection reliability
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 effectively controls the range of brazing material protrusion, preventing leaks and maintaining the smoothness of the tube member's surface, thereby ensuring reliable fluid flow and connection integrity.
Implementation Method 1
a tube member (3D) configured to include an end portion (31a) inserted into the opening portion (22D) of the joint main body (2D) and joined to the joint main body (2D) by brazing
Data Source
AI summary
A joint member includes a joint main body configured to include a flow path portion formed and an opening portion communicating with the flow path portion, and a tube member configured to include an end portion inserted into the opening portion of the joint main body and joined to the joint main body by brazing. The joint main body includes a step portion on which the end portion of the tube member inserted into the opening portion abuts. The tube member includes an annular recessed portion recessed from an outer peripheral surface of the tube member and formed on a flexible tube side with respect to an end surface on a joint main body side.