Explosion-proof Box Seal Testing Using Membrane Pressure
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Solution Overview
Problem
Existing methods for testing the seal of explosion-proof boxes are inefficient due to high water usage, long operating times, residual water issues, and reliability concerns, making them unsuitable for meeting international standards like IEC, which requires testing all boxes sold.
Innovation Solution
An apparatus with a closing body, insertion body, and membrane system that uses pressurized fluid to test the seal of explosion-proof boxes, ensuring correct pressure distribution and quick, reliable testing without the need for drying operations, featuring a membrane that acts under pressure to simulate explosion conditions and a control unit for automated operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the box is completely filled with water for seal testing, then the mechanical strength and seal integrity can be verified, but the operating time becomes excessively long and water consumption increases significantly
Solution Approach 1:
The patent introduces a membrane as an intermediary element that transmits pressure from a fluid (liquid or gas) to the box without requiring the box to be filled with fluid. The membrane converts fluid pressure into direct mechanical pressure on the box surface, enabling seal testing while avoiding the need to fill the entire box volume with water, thus reducing test time and water consumption while maintaining test reliability
Solution Approach 2:
The patent utilizes hydraulic or pneumatic pressure systems to apply controlled pressure through the membrane to the box. By using pressurized fluid (liquid or gas) in a controlled chamber behind the membrane, the system can rapidly apply and release test pressures, significantly reducing the time required compared to manual filling and draining methods, while also reducing overall fluid consumption
2Measurement precision
If high pressure is applied to test the box seal, then the detection precision improves, but the risk of damaging the box increases
Solution Approach 1:
The patent employs a membrane as a cushioning intermediary between the pressure source and the box. The membrane gradually transmits pressure to the box surface, preventing sudden pressure shocks that could damage the box. This cushioning effect allows the system to apply high pressures necessary for detecting fine cracks and fissures while protecting the box from pressure-induced damage
Solution Approach 2:
The patent enables dynamic control of pressure parameters through the membrane system, allowing gradual increase and decrease of pressure during testing. This controlled parameter variation ensures that high pressure can be applied briefly for detection purposes while immediately reducing pressure afterward, preventing cumulative stress damage to the box structure
3Reliability
If water is used to fill the box for testing, then the seal can be tested, but residual water remains causing cleaning and drying operations
Solution Approach 1:
The membrane acts as a barrier intermediary that prevents direct contact between the testing fluid and the box interior. The fluid remains in a controlled chamber behind the membrane, never entering the box being tested. This eliminates the problem of residual water remaining in the box, completely removing the need for cleaning and drying operations while maintaining seal test accuracy through the membrane's pressure transmission
Solution Approach 2:
The patent uses a flexible membrane film to separate the testing fluid from the box interior. This thin film allows pressure transmission while maintaining complete fluid isolation, preventing any water ingress into the box. The membrane's flexibility enables accurate pressure transmission while its impermeability ensures no residual water remains, eliminating post-test cleanup requirements
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 solution enables rapid, reliable, and safe testing of explosion-proof boxes, ensuring compliance with international standards by providing uniform pressure distribution and eliminating the need for extensive cleaning and drying, thus reducing operational costs and increasing test efficiency.
Implementation Method 1
a membrane (26), which acts under pressure to simulate explosion conditions
Implementation Method 2
uses pressurized fluid to test the seal of explosion-proof boxes, ensuring correct pressure distribution
Data Source
Figure 1
Figure 2
Figure 3
AI summary
Apparatus for testing the seal of an explosion-proof box, which comprises: a closing body (10) provided with a resting surface (11) against which the peripheral edge (6) of the box (2) is intended to be sealingly abutted; an insertion body (20), which is fixed to the closing body (10) and is adapted to be inserted in the inner space (5) of the box (2); a membrane (26) arranged as a coating of the insertion body (20), which delimits with the latter a compression chamber (28), and delimits an air gap (29) with the inner surface (4) of the box (2); first feeding means (31) connected to the compression chamber (28) and adapted to introduce inside the latter at least one pressurized working fluid in order to compress the membrane (26) against the inner surface (4) of the box (2); evacuation means (32) connected to the compression chamber (28) and adapted to allow the exit of the working fluid from the compression chamber (28) itself; second feeding means (33) connected to the air gap (29) and adapted to introduce, in the air gap (29), a working fluid in such air gap (29) to be interposed between the membrane (26) and the inner surface (4) of the box (2). Also forming an object of the present invention is a method for testing the seal of explosion-proof boxes obtained by means of an apparatus of the above-described type.