Sealing Device for Power Electronic Communication Recess
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Solution Overview
Problem
Existing power electronic arrangements face challenges in effectively sealing communication devices against contaminants like dust, dirt, and moisture without exerting excessive pressure on printed circuit boards, which can damage the components.
Innovation Solution
A power electronic arrangement featuring a communication device accessible through a recess in a housing, sealed by a silicone rubber sealing device with circumferentially arranged sealing lips and a web, where the housing's pressure device applies minimal pressure on the printed circuit board, ensuring effective sealing against contaminants without damaging the board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing device is provided for sealing off the recess, then sealing effectiveness against contaminants is improved, but pressure is exerted onto the printed circuit board which may cause damage
Solution Approach 1:
The sealing device features two sealing lips positioned at different locations: one sealing lip seals the recess opening, while the other sealing lip seals the interface between the housing and printed circuit board. This localized sealing approach ensures effective contamination protection while distributing and minimizing pressure on the printed circuit board through the compliant sealing lips.
Solution Approach 2:
The sealing device utilizes the elastic properties of the sealing lips to adapt to pressure variations. The sealing lips are designed with appropriate elasticity to maintain sealing effectiveness under varying pressure conditions while preventing excessive pressure transmission to the printed circuit board, thus resolving the contradiction between sealing reliability and pressure protection.
2Reliability
If a sealing device with rigid structure is used, then sealing effectiveness is improved, but device complexity and risk of damage to printed circuit board increase
Solution Approach 1:
The sealing device employs flexible sealing lips made of elastomeric material that can deform and adapt to the sealing surfaces. This flexible membrane approach provides effective sealing against contaminants while being inherently compliant and adaptable, reducing the need for complex rigid sealing structures and minimizing the risk of damage to the printed circuit board.
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 provides a reliable seal against dust, dirt, and moisture ingress with minimal pressure on the printed circuit board, preventing damage and maintaining the integrity of the electronic components.
Implementation Method 1
the sealing device is formed from a material from amongst the group of materials comprising elastomers, in particular based on silicone rubber
Data Source
AI summary
The invention presents a power electronic arrangement comprising a power electronic switching device, a printed circuit board for carrying control signals for driving the power electronic switching device, a housing which covers the printed circuit board, a communication device which is arranged on the printed circuit board and is accessible through a recess in the housing, and comprising a sealing device, wherein the sealing device has a sealing section which rests in a sealing manner on a first sealing face of the communication device, and wherein the sealing device has a first and second sealing lip which are each arranged circumferentially around and at a distance from the communication device, wherein the two sealing lips are connected to one another by a web and both rest on a second sealing face of the printed circuit board, and wherein the housing has a wall-like pressure device which presses on the web and in this way the first sealing lip bears against that side of the pressure device which faces the communication device, and the second sealing lip bears against that side of the pressure device which is averted from the communication device.