Double-Layer Pressure Bag for Complete Liquid Extraction
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Solution Overview
Problem
Conventional squeezing devices for bag-shaped containers struggle to extract all liquid substance, often leaving residue near the port due to uneven pressure distribution and complex structures, and are difficult to produce and use effectively.
Innovation Solution
A pressure bag with a hermetically-sealed chamber that inflates to apply pressure evenly across the container, utilizing a double-layered structure of flexible inner and outer sheets to ensure complete extraction of the liquid substance, with a simple design that facilitates production and use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single pressure bag is disposed on one side of the bag-shaped container, then the device structure is simple, but the liquid substance remains near the opposite short side and cannot be completely squeezed out
Solution Approach 1:
The pressure application function is segmented into two independent pressure bags positioned on opposite sides of the bag-shaped container. This segmentation allows simultaneous pressure application from both sides, effectively pushing the liquid substance toward the port and preventing residue accumulation near the opposite short side.
Solution Approach 2:
The solution transitions from one-dimensional pressure application (single pressure bag on one side) to two-dimensional pressure application (two pressure bags on opposite sides). This dimensional change creates balanced pressure distribution across the container, enabling complete liquid extraction.
2Quantity of substance
If two independent pressure bags are disposed on both sides of the bag-shaped container, then the liquid substance can be squeezed out more completely, but the structure and production process become complicated due to the need to connect the two pressure bags
Solution Approach 1:
Two separate pressure bags are merged into a single integrated pressure bag unit with a folded configuration. The first and second pressure bags are formed as continuous folded portions of the same flexible sheet, eliminating the need for separate connections and simplifying both structure and production while maintaining the dual-side pressure application function.
Solution Approach 2:
A single flexible sheet serves multiple functions: it forms both the first and second pressure bags, provides the housing chamber structure, and creates the integrated unit without requiring separate components. This multi-functionality reduces device complexity while achieving complete liquid extraction.
3Reliability
If the liquid substance is thickened to high viscosity to prevent reflux and diarrhea, then patient safety is improved, but the fluidity decreases and requires extremely large force to squeeze out, imposing considerable burden on workers
Solution Approach 1:
The pressure application is segmented into two simultaneous actions from opposite sides, effectively doubling the pressure efficiency. This segmentation allows high-viscosity liquids to be extracted with reduced manual force burden while maintaining patient safety through proper viscosity thickening.
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
The pressure bag effectively reduces the amount of liquid residue in the container after extraction and simplifies the production and operation process, ensuring efficient and complete removal of the liquid substance.
Implementation Method 1
when a fluid is injected into the pressure chamber, the pressure chamber is inflated and applies pressure to the bag-shaped container housed in the housing chamber
Implementation Method 2
The pressure bag has a double structure in which a flexible inner sheet and a flexible outer sheet are laid one on top of another
Data Source
AI summary
A pressure bag (1) has a bag-like shape including an opening (11) at one end thereof and a bottom portion (12) on the opposite side to the opening (11). The pressure bag (1) has a double structure in which an inner sheet (20) and an outer sheet (30) are laid one on top of the other so that the outer sheet (30) is located on the opposite side of the inner sheet (20) from the housing chamber (10). A pressure chamber (15) is provided between the inner sheet (20) and the outer sheet (30). All of the inner sheet (20), the outer sheet (30), and the pressure chamber (15) extend from one side to the other side of the housing chamber (10) via the bottom portion (12).