Diaphragm Retainer R-Profile for Stable Pump Discharge
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Solution Overview
Problem
Conventional diaphragm and retainer structures in pump devices experience deformation and stress concentration, leading to unstable discharge amounts and reduced lifespan due to changes in effective diameter and strain distribution.
Innovation Solution
A mounting structure featuring a diaphragm with a disc shape and a retainer with R-shaped parts that maintain constant contact during reciprocation, stabilizing the diaphragm's deformation and reducing stress concentration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the diaphragm is structured with a linking part connecting the movable part and fixation part, then the diaphragm can be mounted on the retainer, but the linking part deforms greatly during reciprocation causing unstable discharge amounts
Solution Approach 1:
The diaphragm is divided into distinct functional parts: a movable part for pumping action, a fixation part for mounting, and a linking part for connection. This segmentation allows each part to be optimized independently, with the linking part specifically designed to maintain constant contact with the retainer during reciprocation, preventing deformation and ensuring stable discharge amounts.
2Ease of manufacture
If the retainer supports the diaphragm with a flat surface, then the diaphragm is easy to mount, but stress concentration occurs at the boundary section between movable and linking parts
Solution Approach 1:
The retainer is designed with a curved support surface instead of a flat surface, creating a localized quality change that distributes stress away from the boundary section between the movable and linking parts. This curved surface maintains easy mounting while preventing stress concentration, thereby improving the diaphragm's strength and durability.
3Stress or pressure
If the diaphragm deforms under high pressure load, then the effective diameter changes, but this causes the discharge amount to fluctuate greatly
Solution Approach 1:
The linking part is designed to maintain dynamic constant contact with the retainer during reciprocation, adapting to pressure loads while preventing excessive deformation. This dynamic contact ensures that the effective diameter remains consistent under varying pressure conditions, thereby maintaining stable discharge amounts while still capable of withstanding high pressure loads.
Data Source
AI summary
A mounting structure for a diaphragm and a retainer includes: the diaphragm that is formed to have a disc shape and includes a fixation part positioned in an outer circumferential part of the diaphragm, a movable part positioned in a central part of the diaphragm, and a linking part linking the fixation part and the movable part together, wherein a side of the diaphragm facing a pump chamber is defined as a front side and a side of the diaphragm opposite from the pump chamber is defined as a rear side; and the retainer that has an annular shape, supports the rear side of the movable part of the diaphragm, and reciprocates, together with the movable part, in an advancement/retreat direction to and from the pump chamber. The diaphragm has a first R-shaped part recessed toward the pump chamber, on the rear side of a boundary section between the movable part and the linking part. The retainer includes an abutment part that abuts against the rear side of the diaphragm and a second R-shaped part that is formed in an outer circumferential position of the abutment part so as to protrude toward the pump chamber and that mates with the first R-shaped part.