Closed-Tank Liquid Level Control Using Pressure-Regulated Vessel
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Solution Overview
Problem
Existing methods for regulating the level of food liquids in closed containers are either invasive, prone to failure, or ineffective in preventing liquid leakage and chemical/microbiological changes due to temperature-dependent expansion and air exposure, especially in hermetically sealed containers.
Innovation Solution
An apparatus comprising a vessel with a predetermined volume and an open bottom communicating with the tank, using pressure control to adjust the liquid-free volume within the vessel, allowing for automated and non-invasive regulation of the liquid level by injecting or extracting inert gas to maintain a constant level, thereby compensating for changes caused by thermal expansion or liquid withdrawals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual topping up is performed periodically, then liquid level reduction is partially compensated, but chemical and microbiological alterations cannot be wholly prevented and labor is required
Solution Approach 1:
The system uses the tank's own fermented liquid as the making-up liquid, eliminating the need for external intervention or sacrifice of additional containers. The automatic level control system continuously monitors and compensates for level changes using the product itself,实现 self-service functionality
Solution Approach 2:
The system transitions from periodic manual topping up to continuous automated level control. The automatic system continuously monitors liquid level and performs making-up operations as needed, ensuring uninterrupted protection against oxidation and microbiological changes
2Object-affected harmful factors
If gas sweeping with heavy gases (CO2, Ar) is used, then liquid-air contact is avoided, but high cost and gas dissolution in liquid occur
Solution Approach 1:
The system replaces expensive inert gases (CO2, Ar) with atmospheric air, dramatically reducing material costs. While air contains oxygen that could cause oxidation, the system compensates by maintaining continuous liquid level above the air contact zone, preventing harmful liquid-air contact without requiring costly inert gas
Solution Approach 2:
The system changes the approach from chemical parameter control (using inert gases to displace oxygen) to physical parameter control (maintaining liquid level height to prevent contact). This parameter shift eliminates gas dissolution issues and cost problems while achieving the same protective effect
3Adaptability or versatility
If variable-volume containers with floating lids are used, then liquid level changes are accommodated, but cleaning and sanitization become difficult
Solution Approach 1:
The system separates the functions of level accommodation and cleaning. The fixed tank geometry provides easy cleaning surfaces, while the automatic level control system with external water supply handles the level accommodation function, eliminating the need for complex floating lid structures that hinder cleaning
4Reliability
If hermetically sealed containers are used, then liquid leakage is prevented, but pressure increase may cause failure or breakdown
Solution Approach 1:
The system performs preliminary level control by continuously monitoring liquid level and automatically adding liquid before excessive pressure can build up. This preventive approach maintains optimal liquid levels that prevent both leakage and overpressurization in hermetically sealed containers
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 apparatus provides accurate, automated, and non-invasive level control, preventing liquid leakage and minimizing chemical/microbiological alterations by maintaining a consistent liquid level, even in hermetically sealed containers, without the risks associated with manual topping or complex, failure-prone systems.
Implementation Method 1
means for increasing/decreasing a liquid-free portion of the volume inside the vessel and, as a result, for transferring part of the liquid to/from the tank through the bottom in response to liquid level changes detected in the tank
Implementation Method 2
the liquid level may change as a result of chemico-physical changes in the liquid and the container and particularly of temperature-dependent expansion of liquid
Data Source
Figure 1~2
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AI summary
An automatic apparatus for regulating and controlling the level of a liquid (1) in a tank (2) comprises: liquid level detection means (8); a vessel (3) associated with the tank (2), having a predetermined volume and equipped with an upper closure (6) and with an open bottom (5) in communication with the interior of the tank (2) at a height below the level of the liquid (1); means for increasing/decreasing a liquid-free portion of the volume inside the vessel (3) and for consequently transfer part of the liquid to/from the tank (2) through the bottom (5) in response to changes in the liquid level inside the tank (2) as detected by the detection means (8).