Diaphragm Pump Outlet Port Return Flow Obstructer
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Solution Overview
Problem
Existing diaphragm pumps face inefficiencies due to residual air volume in the dead space between the operating diaphragm and the first cell wall, which reduces their capacity to self-prime and overall performance.
Innovation Solution
Incorporating a return flow obstructer or preventer inside the operating diaphragm's outlet port to prevent air from re-entering the dead space, allowing for efficient evacuation and maintaining negative pressure between the diaphragm and the first cell wall, thus minimizing dead volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an outlet line guided through the operating diaphragm to an external non-return valve is used, then air can be evacuated from the dead space, but a long outlet line creates residual air volume that reduces pump efficiency and self-priming capability
Solution Approach 1:
The harmful residual air volume in the outlet line is eliminated by extracting the non-return valve from the external outlet line and relocating it directly to the outlet port in the operating diaphragm. This extraction removes the source of the problem (long outlet line with residual air) while maintaining the beneficial function (air evacuation from dead space).
Solution Approach 2:
Instead of evacuating air through a long external outlet line as in the prior art, the invention inverts the approach by placing the non-return valve directly at the outlet port within the operating diaphragm. This reverses the traditional configuration and eliminates the problematic outlet line, achieving air evacuation without residual air volume.
2Adaptability or versatility
If the first cell wall is made flexible to couple with the operating diaphragm, then the pump can self-prime, but dead space between the diaphragm and cell wall reduces efficiency
Solution Approach 1:
The harmful dead space between the operating diaphragm and first cell wall is extracted and eliminated by providing an outlet port directly in the operating diaphragm. This allows the flexible first cell wall to maintain coupling with the diaphragm for self-priming while removing the inefficient air pocket that would otherwise form.
Solution Approach 2:
The outlet function is segmented from the external outlet line configuration and integrated directly into the operating diaphragm structure. This segmentation allows the diaphragm to serve dual purposes: maintaining flexible coupling with the cell wall for self-priming while simultaneously providing direct air evacuation to eliminate dead space.
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 diaphragm pump's efficiency and reliability by ensuring the first cell wall remains coupled to the operating diaphragm during suction strokes, eliminating the need for active evacuation and maintaining a low residual volume, thereby improving priming capability and operational accuracy.
Implementation Method 1
maintaining negative pressure between the diaphragm and the first cell wall
Implementation Method 2
the first cell wall of the disposable cell and the operating diaphragm are held against one another and coupled together as a result of negative pressure or as a result of adhesive forces
Implementation Method 3
an operating diaphragm which is drivingly connected to an oscillating stroke drive
Data Source
AI summary
The invention relates to a diaphragm pump (109) having a pump housing (1) on which a disposable cell (2) is releasably fixable, which disposable cell has a first and a second cell wall (3, 4) which (3, 4) define an operating space (5) between them, and having an operating diaphragm (6) which (6) is drivingly connected to an oscillating stroke drive and which (6) is releasably coupleable with the flexible first cell wall (3) on its diaphragm flat side remote from the stroke drive. It is characteristic to the diaphragm pump (109) according to the invention that at least one outlet port (12) in the operating diaphragm (6) is provided with a return flow obstructer or a return flow preventer for evacuating the dead space (11) arranged between it and the first cell wall (3) (cf. FIG. 1).