Overmolded Pump Diaphragm for Sanitary Durability
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Solution Overview
Problem
Diaphragm pumps face challenges in achieving robustness and durability while maintaining sanitary operation, particularly in applications where certain structural parts need to be isolated from the pumped fluid.
Innovation Solution
The diaphragm design incorporates an overmolded structure with a flexible cover made from a first polymer for fluid contact and a backing formed from a second polymer, thermally bonded to provide mechanical support and resilience, allowing the diaphragm to flex during pumping cycles without direct fluid contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diaphragm is made robust with structural parts for mechanical support, then durability and longevity are improved, but direct contact between structural parts and pumped fluid occurs, compromising sanitary operation
Solution Approach 1:
The diaphragm is segmented into two distinct parts: a flexible cover made from food-grade polymer for fluid contact and a backing formed from structural polymer for mechanical support. This segmentation allows each part to be optimized for its specific function while maintaining overall diaphragm performance.
Solution Approach 2:
The structural backing is extracted as a separate component from the flexible cover. The backing is overmolded onto the cover, creating a composite structure where the structural elements are isolated from direct fluid contact while still providing necessary mechanical support through the bonded assembly.
2Reliability
If the diaphragm is made robust with structural parts, then durability is improved, but the complexity of the diaphragm structure increases
Solution Approach 1:
The flexible cover and structural backing are merged into a single integrated diaphragm assembly through overmolding. The thermal bonding process creates a permanent bond between the two polymers, combining the benefits of both materials while presenting a unified component that reduces assembly complexity.
Solution Approach 2:
The diaphragm utilizes a composite structure combining two different polymers: a flexible, food-grade polymer for the cover and a more rigid, structurally sound polymer for the backing. This composite approach allows each material to contribute its optimal properties to the overall diaphragm performance.
3Ease of manufacture
If a single polymer is used for the entire diaphragm, then manufacturing simplicity is maintained, but the diaphragm cannot simultaneously achieve fluid contact safety and structural robustness
Solution Approach 1:
The invention changes the material parameter by using two different polymers with distinct properties. The first polymer (cover) is selected for its flexibility and food-grade safety, while the second polymer (backing) is selected for its structural strength and rigidity. This parameter change enables the diaphragm to meet both sanitary and mechanical requirements.
Solution Approach 2:
Different regions of the diaphragm are assigned different material qualities: the outer cover region uses a flexible, food-safe polymer for fluid contact, while the inner backing region uses a rigid, structurally sound polymer for mechanical support. Each region's material quality is optimized for its specific functional requirements.
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 enhances the durability and longevity of the diaphragm by distributing pumping forces effectively, reducing wear and risk of separation, and ensuring sanitary operation by isolating non-fluid-contacting structural parts.
Implementation Method 1
The first polymer of the cover is thermally bonded to the second polymer of the flexible plate
Data Source
AI summary
A diaphragm for use in a pump includes a cover configured to contact fluid to pump the fluid and a backing disposed at least partially within the cover. The backing includes a flexible plate that extends outward relative to a core of the backing, the flexible plate configured to flex during reciprocation of the diaphragm. The cover is formed from a first polymer and the flexible plate is formed from a second polymer.