Sterile Filter Life Extension via Compressed Air Pressure Equalization
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Solution Overview
Problem
Constant-pressure beverage filling machines face challenges in maintaining aseptic conditions due to dirt and humidity in ambient air, which reduces the service life of sterile filters used for pressure equalization in the product tank.
Innovation Solution
The method involves providing compressed air through a line branch connected to both the environment and the product tank via sterile filters, ensuring that only compressed air, filtered to reduce dirt and humidity, flows into the tank, thereby extending the life of the filters and maintaining aseptic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ambient air is used for pressure equalization through sterile filters, then pressure equalization is achieved, but the service life of sterile filters is significantly reduced due to high dirt load and humidity
Solution Approach 1:
Compressed air is supplied in advance to the product tank through the sterile filter before ambient air can be drawn in. The compressed air supply is controlled to match the breathing requirements of the tank, ensuring that the filter is always supplied with clean compressed air rather than contaminated ambient air, thereby extending its service life
Solution Approach 2:
Compressed air acts as an intermediary substance to replace ambient air for pressure equalization purposes. Instead of allowing ambient air to pass through the sterile filter, compressed air is introduced as a cleaner alternative medium that achieves the same pressure equalization function without the harmful dirt and humidity components
2Reliability
If compressed air is supplied to prevent ambient air intake, then filter service life is extended, but system complexity increases
Solution Approach 1:
The compressed air supply system serves multiple functions: it provides pressure equalization for the product tank, prevents ambient air intake through the sterile filter, and can be integrated with existing factory air supply infrastructure. This multi-functionality justifies the added complexity by delivering multiple benefits from a single system addition
3Reliability
If sterile filters process ambient air continuously, then pressure equalization is maintained, but filtering efficiency decreases due to increased dirt load
Solution Approach 1:
Compressed air is prepared in advance through central treatment systems that remove particles, oil, and moisture before distribution. This pre-treated compressed air is then supplied to the product tank, ensuring that the sterile filter processes only clean air and maintains high filtering efficiency throughout its service life
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 approach effectively extends the service life of sterile filters by preventing ambient air from entering the tank, ensuring reliable pressure equalization without additional valves or ventilation lines, and maintaining aseptic conditions even during fluctuations in beverage fill levels.
Implementation Method 1
a line branch (5), which is connected via at least one sterile filter (6) to the product tank (3) and to the environment (7)
Implementation Method 2
When there is a negative pressure in the product tank (3), a portion of the compressed air (8) supplied at the line branch (5), dependent on the negative pressure, flows through the sterile filter (6) into the product tank (3)
Implementation Method 3
The beverage feed is then driven solely by hydrostatic pressure, depending on the level difference between the product tank's fill level and the product outlet of the filling valves
Data Source
Figure 1~2
Figure 3
AI summary
A method for pressure equalization in a constant-pressure filling machine (1) for beverages (2) and a corresponding constant-pressure filling machine (1) are described. Accordingly, compressed air (8) is supplied at a branch line (5) which is connected on one side to the environment (7) and on the other side, via at least one sterile filter (6), to a product vessel (3) of the constant-pressure filling machine. When there is a negative pressure in the product vessel, a proportion (8a) of the supplied compressed air (8), dependent on the negative pressure, flows through the sterile filter (6) into the product vessel (3), and the remaining compressed air (8b) flows from the branch line into the environment.