Safety Fitting Cylindrical Sealing Dust Plume
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Solution Overview
Problem
Existing safety fittings for gas lines fail to securely seal in dusty environments due to dust plumes forming at radial seals, allowing flames to penetrate and requiring complex adaptation of thick seals, which limits their effectiveness in explosion protection.
Innovation Solution
A safety fitting with a linearly displaceable locking body that forms a cylindrical annular gap when closed, shearing off dust plumes and using a standard sealing ring to achieve a flame-proof and gas-tight seal, with a cylindrical section designed to dissipate heat and prevent flame transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radial seal is used in the closing section, then sealing is achieved, but dust plumes form and cannot be broken through safely, compromising explosion protection
Solution Approach 1:
The invention removes the radial seal from the closing section entirely, extracting the harmful element that caused dust plume formation. The sealing function is relocated to the guide rod where a sealing ring is provided, while the closing body's cylindrical surface directly forms the flameproof gap seal in the closing section without any radial sealing components.
Solution Approach 2:
The sealing approach transitions from radial sealing (perpendicular to flow) to axial sealing (parallel to flow direction). The closing body seals axially against the housing end face, while the flameproof gap is formed radially between the cylindrical closing body and the closing section, creating a multi-dimensional sealing strategy that eliminates dust plume issues.
2Reliability
If thick seals are adapted to the contour of the closing body, then sealing is achieved, but complex processing is required
Solution Approach 1:
The sealing ring on the guide rod serves multiple functions: it seals the gap between the closing body and housing, and its simple annular geometry allows it to be a universal component that can be easily manufactured and replaced. The closing body's cylindrical surface also serves dual purposes as both the sealing surface and the flameproof gap-forming surface.
Solution Approach 2:
Instead of adapting the seal to the closing body contour, the invention inverts the approach by making the closing body itself the sealing element with its simple cylindrical geometry, and using a standard sealing ring on the guide rod to complete the seal. This reverses the traditional sealing paradigm and greatly simplifies manufacturing.
3Object-affected harmful factors
If the closing body rests obliquely on the seal, then dust plumes are not broken through, but flames can penetrate the gap, making the safety fitting ineffective
Solution Approach 1:
The cylindrical closing body is designed to preemptively prevent dust plume formation by maintaining a uniform radial gap throughout the closing section. The preliminary action of creating this controlled gap geometry prevents the conditions that would lead to oblique resting and dust plume accumulation, thereby maintaining explosion protection effectiveness.
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 safety fitting provides high insensitivity to contamination, ensures secure sealing, and is effective in explosion protection by suffocating flames with a large surface area and high heat capacity, allowing use in high-dust environments and pneumatic systems.
Implementation Method 1
the closing section, together with the circumferential section surrounding it, has a heat capacity that is so great that more heat is extracted from a flame in the annular gap than can be produced by combustion in the annular gap
Implementation Method 2
via which heat is dissipated, in relation to the very small volume of the annular gap
Data Source
AI summary
The invention relates to a safety fitting for blocking a line, said fitting comprising a blocking element (7, 7a) that is located in a widened section (4, 4a) of a housing (2, 2a), can be guided linearly in the direction of flow of the line and is held in an open position. Said blocking element can be moved under the influence of a pressure fluctuation in the line or moved actively into a sealing position. The housing (2, 2a) has a cylindrical sealing section (17, 17a), in which the blocking element (7, 7a) engages with a cylindrical section (15, 15a) forming a cylindrical annular gap (18).