Valve Mechanism Seal Compression Control
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Solution Overview
Problem
Existing valve mechanisms in high-pressure thermo-hydraulic systems, particularly in automotive conditioning systems, face issues with uncontrolled seal deformation leading to rapid deterioration and accidental displacement of the seal under high pressures, resulting in short seal life and frequent maintenance needs.
Innovation Solution
A valve mechanism with a first body and a second sliding body, featuring a radial mechanical stop with a conical contact surface and a rectangular cross-section seal, allowing controlled maximum compression and positioning to optimize seal deformation and prevent accidental displacement, utilizing a helical spring for maintaining pressure against the seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the seal is allowed to deform freely under compression, then the valve achieves closure, but the deformation is uncontrolled and leads to rapid seal deterioration
Solution Approach 1:
The patent changes the geometric parameters of the contact surfaces - specifically making the seal seating surface conical with a specific angle and the end body surface substantially flat. This geometric parameter change controls the deformation pattern of the seal, distributing compression forces evenly and preventing excessive localized deformation that leads to rapid deterioration.
Solution Approach 2:
The patent incorporates a mechanical stop that preliminarily defines the maximum compression position of the seal before excessive deformation can occur. This stop prevents the end body from compressing the seal beyond a predetermined safe limit, thereby protecting the seal from rapid deterioration while still allowing sufficient compression for effective closure.
2Reliability
If the seal is highly deformable to ensure sealing, then closure is achieved, but the seal may accidentally detach under high pressure when open
Solution Approach 1:
The patent employs a composite sealing approach combining a deformable seal element (for sealing performance) with a rigid mechanical stop structure (for retention strength). The seal material allows sufficient deformation for sealing while the rigid stop provides the necessary mechanical restraint to prevent accidental detachment under high pressure conditions.
Solution Approach 2:
The mechanical stop is preliminarily positioned to define both the maximum compression limit and the retention boundary for the seal. This preliminary positioning ensures that the seal remains retained during open conditions while still allowing adequate deformation for sealing when closed, resolving the contradiction between sealing performance and retention strength.
3Volume of moving object
If the valve components are made small for automotive applications, then size requirements are met, but seal control and positioning become more difficult
Solution Approach 1:
The patent uses a conical surface for the seal seating area, introducing a curved geometric form that naturally guides and concentrates the compression forces onto the seal. This conical geometry provides inherent positioning control for the seal within the compact valve body, achieving precise seal positioning despite the small overall valve size required for automotive applications.
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 ensures a longer seal duration with optimal sealing performance and minimizes maintenance needs by controlling seal deformation and preventing accidental displacement, maintaining structural resistance and sealing efficiency under high pressures.
Implementation Method 1
a seal element (13), made of elastomer material, advantageously hyper elastic, disposed in a respective housing seating (15) made on the first body (11)
Implementation Method 2
a spring mounted on the stem of the first body, which is conformed to thrust the second body and keep it normally in the closed condition
Data Source
Figure 1~3
AI summary
Valve mechanism (10) for a thermo hydraulic system in which a pressurized fluid circulates, particularly at high pressure. The mechanism (10) comprises a first body (11) provided with at least a housing seating (15) in which a seal element (13) of elastomer material is disposed, and a second body (12) associated slidingly with the first body (11) and defining with the first body (11) at least a pipe (14) through which the pressurized fluid passes. The first body (11) and the second body (12) are reciprocally movable to define a first closed condition in which the second body (12) elastically compresses the seal element (13) and prevents the passage of the fluid through the pipe (14), and a second open condition in which the second body (12) is distanced from the seal element (13) and allows the fluid to pass through the pipe (14). The first body (11) comprises radial mechanical stop members (20) which, in the first closed condition, define a raised abutment and end-of-travel tooth for the second body (12), so as to determine a controlled compression of the seal element (13).