Ejector Through Hole Design for Reliable Combustion Product Ejection
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Solution Overview
Problem
Existing ejectors that use thinned scores to eject combustion products radially face issues with inconsistent ejection due to variations in score thickness, leading to incomplete cleavage and misdirection of the combustion product.
Innovation Solution
The design incorporates a through hole in the ejector's outer shell with a narrow part that concentrates stress at its deepest end, allowing for controlled cleavage and precise ejection of combustion products laterally by shaping the through hole to focus stress at the narrowest point, reducing the need for precise thickness control of thinned parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If thinned scores are used to eject combustion products radially, then the combustion product can be ejected laterally from the ejector, but variations in score thickness lead to inconsistent cleavage and misdirection of the combustion product
Solution Approach 1:
The invention changes the geometric parameters of the through hole, specifically creating a non-uniform cross-section with a narrow part that has a smaller diameter than other parts. This parameter change creates stress concentration at the narrow part, ensuring reliable and consistent cleavage initiation regardless of variations in overall hole dimensions, thereby resolving the contradiction between ease of operation and reliability.
2Reliability
If all scores have the same thickness for radial ejection, then consistent cleavage is achieved, but manufacturing precision requirements increase due to the need for uniform thickness control
Solution Approach 1:
The invention applies local quality by creating a through hole with non-uniform cross-section, where the narrow part has a smaller diameter than other parts. This localized geometric feature concentrates stress at the narrow part, ensuring consistent cleavage initiation without requiring uniform thickness control across the entire hole, thereby resolving the contradiction between reliability and manufacturing precision.
3Ease of manufacture
If the through hole has uniform cross-section, then manufacturing is simpler, but stress concentration is insufficient leading to unreliable cleavage initiation
Solution Approach 1:
The invention changes the geometric parameters of the through hole from a uniform cross-section to a non-uniform cross-section with a narrow part. This parameter change creates stress concentration at the narrow part, ensuring reliable cleavage initiation while maintaining relative simplicity in manufacturing through standard drilling and shaping processes, thereby resolving the contradiction between ease of manufacture and 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 configuration ensures reliable and directed ejection of combustion products with high reproducibility, improving the ejection performance by concentrating stress at the narrowest part of the through hole, thus ensuring effective cleavage and accurate directional ejection.
Implementation Method 1
an igniter including an ignition charge and an ignition portion configured to burn the ignition charge
Implementation Method 2
when the igniter in the housing is actuated and a combustion product is generated, then internal pressure of the housing increases
Implementation Method 3
the through hole includes a narrow part, in which a width of the through hole defined by each of parts of the two through-hole peripheral edges of the plurality of through-hole peripheral edges decreases gradually with an increasing distance from a center of the bottom surface toward the peripheral edge of the bottom surface
Implementation Method 4
the score cleaves in a direction of extension thereof, and, as a result, the combustion product is ejected laterally from the ejector through an opening formed by the cleaving
Data Source
AI summary
An ejector for ejecting a combustion product including, an igniter including an ignition charge and an ignition portion, a pyrotechnic agent, and a cup made of metal, the cup including a bottom surface and a peripheral wall, the peripheral wall being contiguous with a peripheral edge of the bottom surface and disposed to surround the ignition portion, the cup further including an accommodating space accommodating therein the pyrotechnic agent, the bottom surface of the cup including a through hole being defined by a plurality of through-hole peripheral edges, and the adjacent through-hole peripheral edges being connected together at a predetermined connection point, and the through hole including a narrow part, in which a width of the through hole defined by each of parts of the two through-hole peripheral edges of the plurality of through-hole peripheral edges decreases gradually with an increasing distance from a center of the bottom surface toward the peripheral edge of the bottom surface, and the narrow part being located closer to the peripheral edge of the bottom surface than a non-narrow part, which is defined by each of other parts of the two through-hole peripheral edges, is located.