Diaphragm Pump Drive Unit Lower Dead Point Support
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Solution Overview
Problem
Conventional diaphragm pumps experience reduced liquid discharge efficiency due to diaphragm deformation beyond the lower dead point under high internal pressure, leading to decreased discharge amounts.
Innovation Solution
A diaphragm pump design where the diaphragm has a lower dead point located inward of its neutral position, supported by a drive unit on the outer side when at the lower dead point, allowing it to move toward an upper dead point by elastic recovery, thus maintaining tension and preventing deformation beyond the neutral position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the diaphragm is pulled outward to reach the lower dead point, then the liquid discharge efficiency is improved, but under high internal pressure the diaphragm deforms beyond the lower dead point inward, causing the discharge amount to decrease
Solution Approach 1:
The drive unit applies a preliminary supporting force to the diaphragm at the lower dead point to prevent inward deformation caused by high internal pressure. This counteracting force is applied in advance to offset the harmful effect of pressure-induced deformation, ensuring the diaphragm maintains its position and the pump chamber volume remains stable.
Solution Approach 2:
The drive unit dynamically adjusts its support function based on operating conditions. During normal operation, the diaphragm is pulled outward to maximize discharge efficiency. Under high pressure conditions, the drive unit transitions to providing supporting force to maintain the lower dead point position, creating a dynamic response to varying operational demands.
2Reliability
If additional tension mechanisms are added to prevent diaphragm deformation, then the discharge efficiency is maintained, but the device complexity increases
Solution Approach 1:
The drive unit is designed to perform multiple functions: it pulls the diaphragm outward during normal operation to achieve liquid discharge, and simultaneously provides supporting force under high pressure to prevent inward deformation. This multi-functionality eliminates the need for separate tension mechanisms, maintaining reliability while avoiding increased device complexity.
Solution Approach 2:
The patent merges the tensioning function and the driving function into a single integrated drive unit. By combining these functions, the patent avoids adding separate tension mechanisms, thus preventing an increase in device complexity while still maintaining reliable diaphragm position control under varying pressure conditions.
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 liquid discharge efficiency by maintaining tension in the diaphragm and reducing the force required for deformation, suppressing the deterioration of discharge efficiency under high pressure, and simplifying the pump's structure by eliminating the need for additional tension mechanisms.
Implementation Method 1
move toward the lower dead point by elastic recovery due to the elastic force of the diaphragm itself
Data Source
AI summary
Provided is a diaphragm pump including: a diaphragm that forms a part of a wall part of a pump chamber having a space for housing liquid to be delivered and that is elastically deformable to reciprocate in an inward and outward direction relative to the pump chamber; and a drive unit for elastically deforming the diaphragm toward the inner side in the inward and outward direction. The diaphragm has a lower dead point located inward of a neutral position in the inward and outward direction, in which the diaphragm is not elastically deformed at the neutral position. The drive unit is configured to support the diaphragm on an outer side in the inward and outward direction when the diaphragm lies at the lower dead point after reaching the lower dead point.