Coupling Fitting Structure for Negative-Pressure Sealing
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Solution Overview
Problem
Existing coupling fittings fail to effectively seal channels when the pressure inside is negative, and their versatility is compromised due to the need for specialized structures for both fittings.
Innovation Solution
A coupling fitting with a cylindrical body featuring protrusions and a seal material on the outer circumference, where the hooks of the protrusions engage with a target fitting, ensuring a secure seal even under negative pressure, and allowing compatibility with other fittings of the same shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a special structure is provided for both fittings to enable sealing under negative pressure, then sealing under negative pressure is achieved, but the versatility of the coupling fittings becomes poor
Solution Approach 1:
The patent achieves universality by designing a coupling fitting where only one fitting needs the special structure (gap between outer circumference and protrusions with seal material positioned accordingly). The mating fitting can be a standard coupling fitting, allowing the invention to work with existing fittings and maintain versatility while achieving sealing under negative pressure
Data Source
AI summary
A coupling fitting comprises a cylindrical first body having a first end portion, a first coupling part having a plurality of first protrusions arranged around the first end portion and having hooks formed thereon, and a first seal material provided on an outer circumference of the first end portion. A gap is formed between the outer circumference and the plurality of first protrusions. When the coupling fitting is coupled with the target fitting, a part of the target fitting is inserted into the gap, the hooks of the plurality of first protrusions engage the target fitting, and the first seal material contacts an inner circumference of the target fitting.