Medical Check Valve Curved Discharge Wall
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Solution Overview
Problem
Medical check valves face challenges in maintaining reliable closure under high pressures, leading to unintended closure and reduced flow cross-section, as well as excessive membrane stress and lowered opening pressure, which are not adequately addressed by existing designs.
Innovation Solution
The check valve design features a second hose connecting casing with a curvature directing the membrane disk towards the discharge channel, a conically tapering discharge channel with recesses, and a circular reinforcement, ensuring a larger rest area for the membrane and preserving flow cross-section, while minimizing membrane stress and turbulence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the membrane disk is forced against the discharge space wall due to high pressures, then the valve closes, but the flow cross-section is reduced and membrane deformation occurs
Solution Approach 1:
The invention introduces a curvature in the discharge space wall that directs the membrane disk toward the discharge channel, adding a dimensional aspect to the membrane's movement path. This curvature ensures that even when the membrane is forced against the wall under high pressure, it follows a controlled trajectory that preserves the flow cross-section while maintaining closure reliability.
Solution Approach 2:
The invention applies local quality by creating a specific curved region in the discharge space wall opposite the membrane apertures. This localized curvature is designed with a specific radius to match the aperture configuration, providing targeted support and direction to the membrane disk only in the critical area where pressure forces act, without affecting the overall valve structure.
2Reliability
If the membrane disk is forced against the discharge space wall due to high pressures, then the valve closes, but membrane stress increases and opening pressure is lowered
Solution Approach 1:
The curvature in the discharge space wall adds a dimensional component to the membrane's interaction with the wall, distributing the high pressure forces along a curved surface rather than concentrating them at a single point. This dimensional approach reduces peak membrane stress while maintaining the closure function.
Solution Approach 2:
The invention employs spherical curvature in the discharge space wall design, where the wall is curved with a radius corresponding to the aperture radius. This curvature allows the membrane disk to be directed smoothly toward the discharge channel, reducing stress concentrations and preventing excessive membrane deformation under high pressure conditions.
3Reliability
If the membrane apertures come to rest against the opposite wall of the discharge space under high pressures, then unintended closure occurs, but flow is blocked
Solution Approach 1:
The curvature in the discharge space wall creates a three-dimensional path for the membrane disk, ensuring that even when forced against the wall under high pressure, the membrane follows a controlled trajectory that maintains the flow channel open. This dimensional approach prevents the membrane from completely blocking the discharge path while still providing closure control.
Solution Approach 2:
The invention changes the geometric parameter of the discharge space wall by introducing a specific curvature radius that matches the aperture configuration. This parameter change ensures that the membrane disk, when forced against the wall, maintains adequate clearance from completely blocking the flow path, thus preserving productivity while maintaining operational control.
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 allows the check valve to operate at higher pressures with minimal opening pressure, maintaining a large flow cross-section and preventing membrane deformation, thus ensuring reliable and efficient operation under varying pressure conditions.
Implementation Method 1
a resilient membrane disk that is configured between said casings and that, in the event of excess pressure in an intake channel of the first hose connecting casing can be lifted off an annular valve seat enclosing an surrounding intake space communicating with said intake channel and that, in the event of excess pressure in a discharge channel of the second hose connecting casing, can be pressed reliably and in a minimum of time onto the valve seat
Data Source
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AI summary
A check valve in particular for medical applications has a first hose connecting casing and a second hose connecting casing and a membrane disk configured between the two hose connecting casings. The membrane disk is made of a resilient material and cooperates with an annular valve seat. The membrane disk is fitted radially outside the valves seat with apertures leading to a discharge space. The wall (26) of the second hose connecting casing (4) is opposite the apertures (20) and fitted with a surface (29) curved away from the membrane (6) toward the discharge channel (24). The discharge channel (24) is fitted with an intake mouth (27) in the wall (26), the diameter of said mouth being less than that of the discharge channel (24). The discharge channel (24) conically tapers within a transition segment (31) toward the intake mouth (27). Recesses (28) communicating with the discharge space (22) are fitted into the transition segment (31) and are dimensioned in a way to substantially compensate the different flow cross- sections between the intake mouth (27) and the discharge channel (24).