Flanged Cable Entry for Thin-Wall Flameproof Housings
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Solution Overview
Problem
Existing explosion-proof arrangements require significant manufacturing effort due to the need for threaded connections, which is challenging when the wall thickness is minimal, preventing efficient flame-proof sealing and increasing complexity.
Innovation Solution
An explosion-proof arrangement featuring a connection body with a flange surface that forms a flame-proof gap with the housing wall, eliminating the need for threads by using an adhesive or sealing layer and a locking device to secure the connection body, allowing for a threadless edge surface and reduced wall thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If threaded connections are used in wall openings, then flame-proof sealing is achieved, but manufacturing effort increases significantly and wall thickness must be sufficient for threading
Solution Approach 1:
The invention extracts the threading operation from the housing wall manufacturing process. Instead of forming threads directly in the housing wall, a separate connection body with integrated threading is used. This connection body is inserted into a threadless wall opening, separating the sealing function from the structural housing component and eliminating the need for complex threading operations in the housing wall itself.
Solution Approach 2:
The connection body acts as an intermediary element between the housing wall and the cable insert. It provides the threaded connection interface while the housing wall itself remains simple with a threadless opening. The flange of the connection body creates a flame-proof gap that serves as the sealing interface, mediating between the structural requirement of the wall and the sealing requirement of the connection.
2Volume of moving object
If wall thickness is reduced to minimize housing size, then compactness is achieved, but threaded connections become impossible or insufficient for flame-proof sealing
Solution Approach 1:
The threading function is extracted from the housing wall and transferred to the separate connection body. This allows the housing wall to be made as thin as needed for compactness while the connection body, which has the threading requirement, can be designed with sufficient thickness to accommodate threads and create an effective flame-proof gap.
Solution Approach 2:
The flame-proof sealing is achieved by creating a gap in the axial dimension rather than relying on radial thickness for threading. The flange of the connection body extends axially to create a flame-proof gap between the insert section and the housing wall, allowing thin-walled constructions to achieve adequate sealing without requiring thick walls for traditional threaded connections.
3Strength
If threaded connections are formed in housing walls, then connection strength is achieved, but device complexity increases due to additional manufacturing steps
Solution Approach 1:
The complex threading operation is extracted from the housing wall manufacturing process and consolidated into the connection body manufacturing. This allows the housing wall to be produced with a simple threadless opening while the connection body, which requires threading, is manufactured separately with the threaded interface already integrated. The overall device complexity is reduced by eliminating the need to form threads in the housing wall itself.
4Volume of moving object
If flange surface is positioned close to housing wall to minimize gap, then compactness is achieved, but adequate flame-proof cooling distance is compromised
Solution Approach 1:
The flame-proof gap is created in the axial dimension rather than requiring excessive radial space. The flange extends axially from the connection body to create a sufficient gap between the insert section and the housing wall, allowing adequate cooling distance to be achieved without significantly increasing the overall radial dimensions of the assembly.
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 reduces manufacturing effort and allows for effective flame-proof sealing even with minimal wall thickness, preventing ignition of explosive atmospheres by ensuring that hot gases and sparks are cooled or extinguished before escaping.
Implementation Method 1
the flange surface is opposed to the wall inner surface or the wall outer surface and forms a flame-proof gap
Data Source
AI summary
The invention relates to an explosion-proof arrangement (10) with an explosion-proof housing (11) which has a wall opening (23) in a housing wall (12). The wall thickness (d) of the housing wall (12) is so small that it is not possible to form a thread there in order to screw in a connecting body (15) for a line to pass through or for receiving an assembly so as to ensure protection against flame transmission. According to the invention, a connecting body (25), which has a flange (38) with a flange face (39), is inserted into the wall opening (23). The flange face (39) delimits a flameproof gap (58) by way of the housing wall (12). The dimensions of a gap or intermediate space between the connecting body (25) and a boundary face (24) of the housing wall (12), which boundary face delimits the wall opening (23), are not important. The protection against flame transmission can be provided solely by the flameproof gap (58) between the flange face (39) and the housing wall (12).