Pilot Valve Snap-Fit Design for Stable Brazing Connection
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Solution Overview
Problem
The insecure connection between the inlet pipe and the valve body in brazing processes of pilot valves is due to the welding ring expanding and causing solder to be positioned far from the connection, leading to instability.
Innovation Solution
A snap-fit part, specifically an annular snap groove, is formed on the valve body or inlet pipe to snap the welding ring into, ensuring it remains at the connection point during brazing, enhancing the connection stability by increasing the contact area and facilitating solder flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the welding ring is melted during brazing, then the solder can flow and form a joint, but the welding ring expands under stress causing the solder to be positioned far from the connection between the inlet pipe and the valve body
Solution Approach 1:
The snap-fit part is designed to preliminarily position the welding ring at the correct location before brazing occurs. This preliminary positioning ensures that when the welding ring is melted and expands during brazing, the solder remains at the correct position near the connection between the inlet pipe and valve body, rather than being displaced far from the joint area.
2Ease of manufacture
If the welding ring expands under stress during melting, then the brazing process can proceed, but the solder is not easy to flow into the connection between the inlet pipe and the valve body
Solution Approach 1:
The snap-fit part acts as an intermediary structure between the welding ring and the connection area. It provides a restraining effect that mediates the expansion of the welding ring during melting, allowing the brazing process to proceed while simultaneously guiding the solder flow into the connection between the inlet pipe and valve body.
3Device complexity
If no snap-fit structure is used, then the device structure remains simple, but the connection between the inlet pipe and the valve body is insecure
Solution Approach 1:
Instead of making the entire valve structure complex, the snap-fit part is introduced as a localized feature with specific quality - an annular groove structure that provides restraining effect precisely where needed. This local quality enhancement secures the welding ring position during brazing without requiring complex modifications to the overall valve structure.
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 snap-fit design stabilizes the connection between the inlet pipe and valve body, ensuring a secure and stable joint by preventing welding ring deformation and promoting solder flow, thereby improving the overall integrity of the assembly.
Implementation Method 1
The snap-fit part is configured for allowing a welding ring to be snapped into... the contact area therebetween can be increased... superior restraining effect
Implementation Method 2
In the brazing process, a welding ring is sleeved over the inlet pipe and placed on the valve body... When the welding ring is melted
Data Source
AI summary
The present application relates to a pilot valve and a switching valve. The pilot valve includes a valve body and an inlet pipe having an end plugged into the valve body. A snap-fit part is formed on either or both of the valve body and the inlet pipe and located at a plug-in position between the inlet pipe and the valve body, and the snap-fit part is configured for allowing a welding ring to be snapped into.