Bellows Diaphragm Valve Geometry to Prevent Liquid Retention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Suck-back valves with bellows structures are prone to liquid retention and impurity accumulation due to the design of the bellows and diaphragm configuration, leading to potential defects where particles are discharged at unexpected times.
Innovation Solution
A valve design featuring a bellows part with a cylindrical wetted surface and valleys adjacent to a single peak, where the lower end of the bellows is connected to the wetted part, ensuring the entire region is in the liquid flow direction, and the angle of inclined surfaces is set between 30° and 40° to facilitate liquid flow and prevent retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bellows part with valleys is formed to provide sealing and flexibility, then the sealing performance and flexibility are improved, but liquid retention and impurity accumulation occur in the valley regions
Solution Approach 1:
The invention extracts and eliminates the problematic valley regions from the bellows structure by providing drainage holes that lead directly from the valleys to the exterior. This removes the liquid retention issue while preserving the sealing and flexibility functions of the bellows part.
Solution Approach 2:
The drainage holes act as intermediary channels that connect the valley regions to the exterior, providing a controlled path for liquid and impurity discharge. This mediator structure allows the bellows to maintain its sealing function while preventing harmful liquid accumulation.
2Object-generated harmful factors
If the bellows part is positioned to allow liquid flow through the region, then liquid retention is prevented, but the structural integrity and sealing may be compromised
Solution Approach 1:
The bellows part is segmented by introducing drainage holes that divide the internal structure into functional zones. The valleys remain for sealing while the holes provide flow paths, creating a segmented structure that simultaneously achieves both sealing and drainage functions.
Solution Approach 2:
Different regions of the bellows part are given different functions: the valley regions provide sealing contact while the drainage hole locations provide flow pathways. This local differentiation allows the structure to achieve both sealing performance and liquid drainage without compromising either function.
3Object-generated harmful factors
If drainage holes are added to the bellows part to enable liquid discharge, then liquid retention is prevented, but the device complexity increases
Solution Approach 1:
The drainage function is merged into the existing bellows structure by forming drainage holes directly in the bellows part. This integration combines the sealing function of the bellows with the drainage function, eliminating the need for separate drainage components and reducing overall device complexity.
Solution Approach 2:
The bellows part is given multiple functions: it provides sealing through its valley regions, maintains flexibility through its expandable structure, and enables liquid drainage through the integrated drainage holes. This multi-functionality reduces the need for additional components.
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 effectively prevents liquid retention and impurity accumulation near the bellows, ensuring reliable operation by ensuring the bellows region is within the liquid flow path and maintaining the suck-back function to prevent dripping during full-close operations.
Implementation Method 1
a bellows part that couples between the base and the tip part... The bellows is disposed in the suck-back chamber
Implementation Method 2
a piston part that is accommodated in the housing so as to be movable along the shaft line and receives a first urging force acting downward in the shaft line from pressure of a fluid introduced from an outside of the housing
Implementation Method 3
an urging force generation part that transmits to the piston part a second urging force acting upward in the shaft line
Implementation Method 4
when the pressure of the fluid introduced from the outside is weakened and the second urging force generated by the urging force generation part exceeds the first urging force, the valve element part comes into contact with the valve hole to bring the valve hole into the closed state to block the supply of the liquid to the outlet flow path
Data Source
Figure 1
Figure 2
Figure 3
AI summary
To prevent a defect in which a liquid is retained in a vicinity of a valley of a bellows part and particles such as impurities are accumulated. Provided is a valve (100) including a valve element part (20) and a diaphragm part (50) that is coupled to the valve element part (20). The diaphragm part (50) includes a base (51), a tip part (52), and a bellows part (53) that couples between the base (51) and the tip part (52). A wetted part (52a) in contact with the liquid at the tip part (52) is formed in a cylindrical shape extending along a shaft line X. A lower end part (53d) of the bellows part (53) is connected to the wetted part (52a) in a connection position CP coinciding with an outer peripheral surface of the wetted part (52a). The valley (53b) of the bellows part (53) is disposed in the connection position CP.