Gear Pump Pre-Wetting for Milk Frother Vacuum Sealing
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Solution Overview
Problem
Milk frother systems with gear pumps face high demands on tightness and sensitivity to wear due to the need to generate vacuum pressure equal to the height of the milk column, leading to leakage issues and complex sealing requirements, which are costly and difficult to maintain.
Innovation Solution
The system wetts the gear pump with water or steam before operation to create a sealing effect, allowing for higher negative pressure generation without relying on the gear pump's own vacuum, reducing the need for precise component tolerances and simplifying maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gear pump is designed to generate vacuum pressure equal to the maximum height of the milk column, then the pump can suck in milk from the container, but the tightness requirements become extremely high and any leakage equalizes the pressure difference
Solution Approach 1:
The system performs a preliminary wetting action by conveying water or steam through the milk supply line into the gear pump chamber before milk is pumped. This creates a liquid seal in advance that prevents air leakage during the vacuum phase, allowing the pump to generate the required negative pressure without requiring extremely tight mechanical seals.
Solution Approach 2:
The invention uses hydraulic sealing by introducing liquid (water or steam) into the gear pump chamber to create a liquid barrier that prevents air from leaking from the high-pressure outlet side to the low-pressure inlet side. This liquid seal replaces the need for complex mechanical sealing systems.
2Reliability
If complex sealing systems are used to prevent leakage, then tightness is improved, but the device complexity increases and cleaning becomes difficult
Solution Approach 1:
The invention extracts the sealing function from the mechanical gear pump structure and relocates it to the fluid system by using water or steam to create a liquid seal. This removes the need for complex mechanical sealing components while maintaining reliable sealing performance.
Solution Approach 2:
Water or steam acts as an intermediary substance that mediates the sealing function between the high-pressure and low-pressure sides of the gear pump. This liquid intermediary creates an effective seal without requiring direct mechanical contact or complex sealing components.
3Reliability
If the gear pump operates without lubrication due to food contact requirements, then food safety is maintained, but wear and tear increases during long term use
Solution Approach 1:
The liquid (water or steam) that is already present in the system serves a dual function: it creates the necessary seal and simultaneously provides lubrication for the gear pump components during operation. This self-service approach eliminates the need for separate lubrication systems while extending component life.
4Ease of operation
If the gear pump is positioned above the milk container floor to enable suction, then milk can be drawn from the container, but the negative pressure requirement increases with height
Solution Approach 1:
The system performs a preliminary wetting action before milk suction begins. By filling the space between the gear pump and milk surface with liquid first, the system reduces the effective height of the milk column that the pump must lift, thereby reducing the required negative pressure.
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 enables the gear pump to achieve significantly higher negative pressure with lower tolerance requirements, reducing manufacturing costs and sensitivity to wear, while ensuring reliable milk frothing and heating functions.
Implementation Method 1
a liquid in the gear pump produces a certain sealing effect... Due to the approach according to the invention, it works—by means of water—even if the gear pump is dry... the adhesive properties of the water and the resulting sealing effect
Data Source
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AI summary
The invention relates to a milk foaming system having a gear pump (7) which is connected at least to a milk supply line on the inlet side, said supply line being connected to a milk vessel which can be filled with milk in the operating state, wherein the supply line protrudes into the milk vessel for example. The gear pump suctions milk from the milk vessel via the milk supply line. The system additionally has a supply line for supplying water and/or steam to the gear pump in order to flush the gear pump after use for example or in order to heat the pumped milk (in particular by supplying steam). According to the invention, the milk foaming system is designed such that the gear pump is wetted with water or steam pumped via the supply line prior to pumping milk under specific conditions.