Sealed Diaphragm Pump Integrated Molded Housing
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Solution Overview
Problem
Current diaphragm pump designs have numerous undesirable leak paths that allow fluids to enter the motor, leading to inefficiencies and reliability issues.
Innovation Solution
The design incorporates a molded housing with integrated endbell portions and an upper housing to create a circumferential fluid-tight sealing arrangement, utilizing U-shaped diaphragm sealing channels and interlocking seals between the diaphragm and check valve assembly to minimize leak paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional multi-component housing design with multiple O-ring seals is used, then the pump can be assembled with standard sealing components, but numerous leak paths allow fluids to enter the motor
Solution Approach 1:
The patent merges the rear endbell, intermediate housing portion, and front endbell into a single integrated molded housing unit. This consolidation eliminates the need for multiple separate sealing interfaces between housing components, reducing the number of potential leak paths while maintaining reliable sealing through the integrated structure
Solution Approach 2:
The patent extracts and eliminates unnecessary sealing components (multiple O-rings and gaskets) by redesigning the housing as a single molded unit. The only remaining sealing interface is between the front endbell portion and upper housing, significantly reducing the number of sealing components needed while improving overall sealing reliability
2Reliability
If multiple O-ring seals and gaskets are used at each endbell, then the housing components can be sealed individually, but too many leak paths exist through the housing assembly
Solution Approach 1:
By combining multiple housing components into a single molded housing unit, the patent eliminates intermediate sealing interfaces that created leak paths. The integrated structure ensures fluid sealing through continuous material without gaps requiring additional seals, preventing fluid intrusion into the motor
Solution Approach 2:
The patent strategically segments the housing into two main portions (molded housing unit and upper housing) with a single sealing interface, rather than using multiple segments. This minimal segmentation reduces the number of sealing interfaces to just one critical location, eliminating multiple potential leak paths while maintaining functional segmentation
Data Source
AI summary
A pump includes a molded housing configured with a rear endbell portion to receive an armature and bearing, an intermediate motor portion to receive a motor shell and magnets arranged around the armature, and a front endbell portion to receive a diaphragm assembly having a diaphragm support plate supporting a diaphragm, the rear endbell portion, the intermediate motor portion and the front endbell portion being configured as an integrated molded housing unit, the diaphragm having two circumferential diaphragm sealing surfaces. The pump also includes an upper housing configured to assemble and couple to the molded housing so as to form a circumferential fluid-tight sealing arrangement that is configured between the front endbell portion and the upper housing on only one end of the pump.