Pneumatic Engine Valve Diaphragm Structure Against Condensate Sticking
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Solution Overview
Problem
Existing valve devices for internal combustion engines are prone to functional failures due to ice formation or condensate accumulation, which causes the membrane to stick to the housing, leading to operational issues and potential corrosion.
Innovation Solution
The valve device incorporates axial projections on the housing base with a drain to reduce the risk of membrane sticking, featuring a design where the membrane rests on these projections, preventing condensate accumulation and ensuring reliable operation by directing fluids and contaminants away from the membrane area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the diaphragm rests directly on the base surface of the housing, then the structure is simple, but condensate accumulation causes the diaphragm to stick to the housing
Solution Approach 1:
The base surface is segmented into multiple projection elements that create discrete contact points for the diaphragm. This segmentation prevents continuous contact between the diaphragm and the base surface, allowing condensate to drain away from the contact areas and preventing sticking while maintaining structural simplicity.
Solution Approach 2:
The projections act as intermediary elements between the diaphragm and the base surface. These projections elevate the diaphragm contact points above the base surface, creating a drainage path for condensate and preventing direct adhesion between the diaphragm and the housing while adding minimal structural complexity.
2Ease of manufacture
If the diaphragm rests on the base surface, then manufacturing is simple, but ice formation or condensate causes the diaphragm to stick
Solution Approach 1:
The projections are pre-formed on the base surface during manufacturing, creating an elevated contact surface for the diaphragm before condensate or ice formation occurs. This preliminary structural feature ensures that even when condensate accumulates or ice forms, the diaphragm contact points remain elevated and free from adhesion, without requiring complex post-manufacturing modifications.
Solution Approach 2:
The base surface is modified locally at specific projection locations rather than uniformly across the entire surface. This localized modification creates drainage pathways and elevated contact points precisely where the diaphragm makes contact, while leaving the rest of the base surface simple and easy to manufacture.
3Reliability
If the diaphragm is positioned away from the base surface using projections, then sticking is prevented, but device complexity increases
Solution Approach 1:
The projections are integrated directly into the base surface as a unified structure rather than being separate components. This merging of the projection features with the base surface maintains manufacturing simplicity and structural integrity while achieving the reliability benefit of preventing diaphragm sticking through elevated contact points.
4Reliability
If condensate accumulates in the enclosed space, then a microclimate forms causing corrosion, but adding drainage increases device complexity
Solution Approach 1:
The drainage function is extracted and integrated into the base surface through the projection structure. The projections naturally create drainage pathways that channel condensate away from the diaphragm contact areas toward the outlet, eliminating the need for separate drainage components or complex drainage systems while preventing corrosion.
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 design significantly reduces the risk of membrane sticking and prevents internal climate buildup, ensuring reliable functioning and preventing corrosion, thus maintaining the valve's functionality over a long service life regardless of ambient temperatures.
Implementation Method 1
the drain extends from the lowest geodetic position of the base towards the inlet or outlet and is formed by a wall sloping downwards towards the inlet or outlet
Implementation Method 2
a pneumatically actuated actuator by means of which the valve closing element can be moved, and which has at least one diaphragm which is clamped in the housing and divides an actuator space into a first subspace and a second subspace
Implementation Method 3
When a vacuum is applied to the control chamber, the bellows contracts, allowing the check plate to perform its normal function
Data Source
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AI summary
The invention relates to a valve device for internal combustion engines, said valve device comprising: a housing (20) having an inlet (22) and an outlet (24); a valve closing element (34) which can be lowered onto a valve seat (36) and raised from the valve seat (36); and a pneumatically actuated actuator (10) by means of which the valve closing element (34) can be moved and which has at least one diaphragm (16; 56) which is clamped in the housing (20) and divides an actuator space (11) into a first partial space (12) and a second partial space (57). In order to prevent the diaphragm from adhering in the actuator space, according to the invention at least one projection (71) is formed on a base surface (58) of the housing (20), said projection being raised axially from said base surface (58) in the direction of the diaphragm (16; 56) and on which projection the diaphragm (16; 56) rests in at least one of its end positions on the housing (20), wherein a drain (72) which fluidically connects the second partial space (57) to the inlet (22) or outlet (24) is formed in the base surface (58).