Integrally Molded Excess Flow Shut-Off Device
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Solution Overview
Problem
Existing excess flow shut-off devices often malfunction by blocking outlets even when hoses are undamaged due to sensitivity to fluid flow, and components are not properly modulated for quality management, leading to user avoidance.
Innovation Solution
An excess flow shut-off device with an integrally modulated opening and closing member, support member, and blocking member, featuring a cylindrical part with a fine protrusion, a shaft hole, and a spring, allowing for easy assembly and quality management, ensuring uniform operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the shut-off device is made sensitive to fluid flow to detect hose damage, then the detection capability is improved, but false blocking occurs even when the hose is not damaged
Solution Approach 1:
The support member, opening and closing member, spring, and cylindrical member are integrally molded as a single unit, ensuring precise relative positioning and eliminating assembly variations that cause inconsistent triggering. This integration ensures the device responds only to genuine excess flow conditions rather than manufacturing tolerances.
Solution Approach 2:
The integral molding process allows precise control of geometric parameters such as the positioning protrusion depth, opening and closing member dimensions, and spring pre-compression, enabling optimization of the trigger threshold to distinguish between normal flow variations and actual hose damage conditions.
2Ease of manufacture
If components are separately manufactured and assembled, then manufacturing flexibility is improved, but quality consistency deteriorates leading to malfunction
Solution Approach 1:
Multiple components (support member, opening and closing member, spring, cylindrical member) are integrally molded into a single piece, eliminating assembly steps and ensuring consistent relative positioning. This resolves quality inconsistency while the single-mold process maintains manufacturing efficiency.
Solution Approach 2:
The integrally molded structure serves multiple functions simultaneously: the support member provides structural support, the opening and closing member controls flow, the spring provides restoring force, and the positioning protrusions ensure correct assembly - all in one manufactured unit.
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 device effectively blocks fluid flow only when the hose is damaged, preventing unnecessary shut-offs and facilitating easy manufacturing of uniform products with improved reliability.
Implementation Method 1
a spring (30) forcedly fit to the shaft part (21)
Implementation Method 2
a ball 2 blocks an outlet 3 when a hose is damaged so as to occur a fluid flow exceeding a magnetic force of a magnet 1
Data Source
AI summary
Disclosed therein is an excess flow shut off device which is operated under the same conditions by integrally modulating an opening and closing member, a support member for supporting the opening and a blocking member for blocking a passage by the opening and closing member. The excess flow shut off device is easy in quality management and allows an easy manufacture of uniform products operating under the same conditions because a support member, a spring, an opening and closing member, a joining member, and a cylindrical member are integrally joined together and modulated.