Accumulator Gas Plug Inclined Surface Seal
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Solution Overview
Problem
Conventional accumulators with a gas plug fitted to a concave portion of the housing are prone to foreign matter ingress, leading to potential rust and strength degradation due to the space created during welding, which can be exacerbated by environmental factors like water or dust.
Innovation Solution
The accumulator design incorporates a flange on the gas plug that contacts an inclined surface of the housing, creating a secure surface contact that prevents foreign matter entry and reduces the intrusion route, thereby minimizing the risk of rust and strength degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a space is provided between the gas plug and the concave portion to accommodate deformation during welding, then welding deformation is prevented, but foreign matter can enter the space causing rust and strength degradation
Solution Approach 1:
An O-ring seal is introduced as an intermediary element between the gas plug and the housing concave portion. This seal fills the space created by welding deformation while preventing foreign matter ingress. The O-ring is compressed between the gas plug flange and the housing, creating a sealing barrier that addresses both the deformation accommodation and contamination prevention requirements
Solution Approach 2:
The O-ring seal acts as a flexible element that can deform to accommodate the space variations caused by welding deformation. The flexible nature of the O-ring allows it to maintain contact and sealing pressure while adapting to the dimensional changes in the gas plug during and after welding, thus preventing foreign matter entry without compromising the welding process
2Reliability
If the gas plug is welded to the housing, then gas sealing is achieved, but the gas plug may deform due to welding heat
Solution Approach 1:
A clearance or space is intentionally designed between the gas plug and the housing concave portion before welding. This pre-planned space acts as a cushion that absorbs the dimensional changes and deformation caused by welding heat, preventing the gas plug from deforming excessively while maintaining the sealing function
3Length of moving object
If the overall length of the accumulator is reduced by fitting the gas plug into a concave portion, then downsizing is achieved, but foreign matter can more easily enter the space between components
Solution Approach 1:
The O-ring seal serves as a mediator that blocks the pathway for foreign matter while allowing the compact design to be maintained. By placing the seal in the interface between the gas plug and housing, it prevents foreign matter from entering the internal space without requiring the gas plug to protrude from the housing
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 effectively prevents foreign matter from entering the space between the gas plug and the housing, thus protecting the accumulator components from degradation and ensuring their structural integrity.
Implementation Method 1
the gas plug is welded to the housing by melting the welding portion in a state where the welding portion is making contact with the housing
Implementation Method 2
the gas plug is welded to the housing by melting the welding portion
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
Provided is an accumulator that prevents foreign matters from entering a space S between a housing and a gas plug that is fitted to a concave portion of the housing. An accumulator (100) includes: a housing (110) having an injection opening (112b) into which pressure gas is injected; and a gas plug (150) occluding the injection opening (112b), and seals the pressure gas in the housing (110) by the gas plug (150) that is welded to the housing (110) with a welding portion (151) of the gas plug (150) being melted, wherein the housing (110) includes: a concave portion to which the gas plug (150) occluding the injection opening (112b) is fitted, and to which the gas plug (150) is welded with the welding portion (151) being melted on its bottom surface (110a); and an inclined surface (110c) that extends from an edge portion of the concave portion toward an outside of the housing (110) such that a distance from a center of the injection opening (112b) increases, and the gas plug (150) includes a flange (152) which makes contact with the inclined surface (110c) in a state of being fitted and welded to the concave portion.