Diaphragm Valve Structure for Internal Bonding and Leak Prevention
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Solution Overview
Problem
Existing valve designs face reliability issues due to the exposure of the diaphragm's outer peripheral end, which can lead to peeling and fluid leakage under pressure differences, reducing the valve's effectiveness over time.
Innovation Solution
A valve structure where the diaphragm is bonded internally within a recessed chamber formed by two case members, with a reinforcing plate and specific bonding members to enhance tensile strength and prevent external pressure exposure, using an elastic film and support plate configuration to manage deformation and prevent breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the outer peripheral end of the diaphragm is exposed to the outside from the case, then the structure is simpler and easier to manufacture, but the reliability decreases due to peeling and fluid leakage under pressure differences
Solution Approach 1:
The diaphragm's outer peripheral end is nested inside the case rather than being exposed externally. The bonding member is positioned within the case to secure the diaphragm, creating a nested configuration where the diaphragm is contained within the case structure. This resolves the contradiction by maintaining manufacturing simplicity while improving reliability through internal positioning that protects against pressure-induced peeling and leakage.
2Reliability
If the diaphragm is bonded with a bonding member inside the case, then the reliability is improved by preventing peeling and leakage, but the device complexity increases
Solution Approach 1:
The bonding member is applied locally only at the outer peripheral end of the diaphragm where it contacts the case, rather than across the entire diaphragm surface. This localized bonding approach improves reliability at the critical stress point while minimizing the addition of complexity to the overall device structure.
3Strength
If the plane area of the diaphragm is smaller than the plane area of the case, then the bonding strength is improved, but the flow capacity may be reduced
Solution Approach 1:
The diaphragm is designed with a smaller plane area than the case, concentrating the bonding interface at the periphery where the diaphragm contacts the case wall. This local quality approach ensures strong bonding at the critical interface while the central portion of the diaphragm maintains sufficient area for fluid flow, thus resolving the contradiction between bonding strength and flow capacity.
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 improves the reliability of the valve by preventing fluid leakage and enhancing bonding strength, ensuring the diaphragm remains secure and functional over time, suitable for applications like pumps and medical devices.
Implementation Method 1
a diaphragm (150) formed so as to partition the valve chamber into a lower valve chamber (106) connected to the inflow port (H1) and an upper valve chamber (107) connecting the discharge port (H3) and the air outlet (H2)... an elastic film (104)
Implementation Method 2
the outer periphery of the diaphragm (150) is fixed to at least one of the first case member (101) and the second case member (105) with a first bonding member (300) so as to be located inside the case
Data Source
AI summary
A valve includes a first case member having an inflow port and a first valve seat, a second case member having an air outlet and a discharge port, a valve chamber formed by bonding the first case member and the second case member, at least one of which has a recessed shape, with a first bonding member while the recessed shape is located on an inner side, and a diaphragm formed so as to partition the valve chamber into a lower valve chamber connected to the inflow port and an upper valve chamber connecting the discharge port and the air outlet.