Diaphragm Pump Check Valve Mounting for Swelling-Tolerant Sealing
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Solution Overview
Problem
Existing valve designs for diaphragm pumps face challenges such as difficulty in automated installation, loss of form-fit positioning due to chemical resistance and swelling issues, and require low production tolerances for tight sealing, which are costly and hard to achieve, especially in small pumps.
Innovation Solution
The valve design features outer edge mountings with webs connected via connecting brackets that engage with holding bases of the valve housing, allowing for correct positioning and tension application without crushing, facilitating easy installation and reliable sealing under pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the valve plate is made from elastic material to enable chemical resistance and flexibility, then the valve can adapt to pressure differences and maintain sealing, but the valve plate may swell and distort, losing form-fit positioning
Solution Approach 1:
The valve plate is divided into a closing body and outer edge mountings that are disconnected from one another. The outer edge mountings engage only on the closing body and are connected via connecting brackets to holding bases, separating the sealing function from the positioning function. This segmentation prevents swelling of the elastic material from affecting the form-fit positioning provided by the connecting brackets.
Solution Approach 2:
Connecting brackets serve as intermediaries between the outer edge mountings and the holding bases of the valve housing. These brackets provide form-fit positioning and engagement while allowing the elastic valve plate material to swell without compromising the positioning accuracy, thus mediating between the chemical resistance requirement and the positioning precision requirement.
2Reliability
If the valve seat protrudes beyond the valve housing plane to ensure tight sealing, then sealing reliability improves, but production tolerances must be very low, increasing cost
Solution Approach 1:
The valve design uses the pressure difference across the valve to automatically ensure tight sealing. The outer edge mountings are elastically preloaded for tension, and the closing body is moved into open position by pressure difference against the elasticity of the valve plate. This self-actuating mechanism compensates for tolerance variations in the valve seat protrusion, maintaining sealing reliability without requiring very low production tolerances.
3Stability of the object's composition
If the valve plate is clamped in the valve housing to maintain positioning, then the valve plate remains stable, but crushing in sealing regions occurs, reducing valve plate function
Solution Approach 1:
The valve plate structure is segmented into a closing body and outer edge mountings that are disconnected. The outer edge mountings engage only on the closing body and are connected via connecting brackets, eliminating the need to clamp the entire valve plate including sealing regions. This segmentation maintains positioning stability through the connecting brackets while preventing crushing of the sealing regions.
Solution Approach 2:
The clamping function is extracted from the valve plate itself and transferred to the connecting brackets that engage with the holding bases. This extraction allows the valve plate to remain unclamped in its sealing regions, preventing crushing and maintaining valve plate function, while the connecting brackets provide the necessary positioning stability.
4Adaptability or versatility
If clearance is provided around the valve plate to accommodate swelling, then chemical resistance is maintained, but form-fit positioning is lost and valve plate position becomes ambiguous
Solution Approach 1:
The valve plate is segmented into a closing body and outer edge mountings that are disconnected. The outer edge mountings with connecting brackets provide form-fit positioning engagement, while the closing body maintains chemical resistance through the elastic material. This segmentation allows clearance for swelling without losing position definition, as the connecting brackets maintain engagement.
Solution Approach 2:
The connecting brackets act as intermediaries that maintain form-fit positioning engagement between the outer edge mountings and the holding bases. This intermediary structure allows the elastic valve plate material to swell with chemical resistance while the connecting brackets maintain precise position definition through their engagement geometry.
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 enables easy mounting, including automated production, maintains precise positioning, and ensures reliable sealing with reduced dependence on precise tolerances, while minimizing the use of space and avoiding function-reducing crushing, ensuring effective operation under varying pressures.
Implementation Method 1
a valve plate (10), which is elastically preloaded for tension via outer edge mountings (101)
Implementation Method 2
can be moved into open position by a pressure difference, against the elasticity of the valve plate
Data Source
AI summary
A plate or check valve, for diaphragm pumps, including a valve chamber in which at least one valve seat is provided that interacts with a valve plate that is elastically pretensioned via outer edge mountings such that a closing body of the valve plate can be moved from a closed position, in which it sealingly lies on the valve seat, into an open position against the elasticity of the valve plate. The outer edge mountings have webs and connecting brackets which are connected to the web ends facing away from the closing body. The outer edge mountings are disconnected from one another and only engage on the closing body, each of the outer edge mountings has at least two webs that are connected together via a connecting bracket, and each connecting bracket engages behind at least one paired holding base of the valve housing.