Stepper-Driven Pinch Valve for Hygienic Beverage Flow Control
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Solution Overview
Problem
Existing beverage preparation machines, such as espresso machines, face challenges with magnetic valves that are heavy, expensive, prone to contamination, and require constant energization, leading to inefficiencies and hygiene issues.
Innovation Solution
Incorporating a pinch valve with at least two fluid passage lines that performs valve and control functions, utilizing a stepper motor-driven activating mechanism to control fluid flow, allowing for versatile distribution and flow quantity control, including change-over and throttling functions, reducing contamination risk and energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic valves are used for fluid control in beverage preparation machines, then reliable valve and control functions are achieved, but the device becomes heavy, expensive, and requires constant energization
Solution Approach 1:
The patent replaces magnetic valves (electromagnetic system) with a pinch valve actuated by a linearly operating activating mechanism (mechanical system). The pinch valve uses mechanical compression of a flexible tube to control fluid flow, eliminating the need for electromagnetic coils and magnets. This substitution significantly reduces weight while maintaining reliable valve functions for controlling coffee and milk flows.
Solution Approach 2:
The pinch valve components, particularly the flexible tube, are simpler and less expensive than magnetic valves. The activating mechanism with pinch wedges and linear motor represents a cost-effective alternative to expensive electromagnetic components, making the overall beverage preparation machine more affordable while maintaining functionality.
2Reliability
If magnetic valves are used for fluid control, then valve functions are achieved, but the device becomes expensive
Solution Approach 1:
The patent replaces expensive magnetic valves with a mechanically actuated pinch valve system. The linear motor driving the activating mechanism is simpler and less costly than electromagnetic valve components. The pinch valve construction with flexible tubes and mechanical actuators reduces manufacturing complexity and material costs while maintaining reliable fluid control for beverage preparation.
Solution Approach 2:
The pinch valve components use simpler, less expensive materials and construction methods compared to magnetic valves. The flexible tube and mechanical actuating components can be manufactured more cost-effectively, reducing the overall bill of materials and manufacturing costs for the beverage preparation machine.
3Reliability
If magnetic valves are used for fluid control, then valve functions are achieved, but susceptibility to contamination increases
Solution Approach 1:
The patent replaces magnetic valves with a pinch valve where the flexible tube is compressed externally by pinch wedges. The fluid (coffee or milk) flows through the flexible tube without contacting any mechanical moving parts. This design eliminates contamination risks from valve internals, seals, and electromagnetic components that could degrade and contaminate the beverage, ensuring higher hygiene standards.
Solution Approach 2:
The patent uses a flexible tube (thin film) as the fluid passage that can be compressed externally to control flow. The flexible tube encapsulates the fluid path, preventing contact between the beverage and external mechanical components. This flexible membrane approach ensures that coffee and milk remain in contact only with the smooth inner surface of the tube, minimizing contamination risk while maintaining reliable valve control functions.
4Reliability
If magnetic valves are used for fluid control, then valve functions are achieved, but constant energization is required leading to increased energy consumption
Solution Approach 1:
The patent replaces magnetic valves that require constant electromagnetic energization with a mechanically actuated pinch valve. The linear motor provides intermittent mechanical actuation through the activating mechanism, which positions the pinch wedges to control fluid flow. Once positioned, the mechanical system maintains valve state without continuous energy input, dramatically reducing power consumption compared to electromagnetic valves that must remain energized to maintain their position.
Solution Approach 2:
The linear motor actuates the activating mechanism periodically to change valve positions rather than requiring continuous operation. The motor moves the pinch wedges to desired positions and then stops, allowing the mechanical system to maintain the valve state passively. This periodic actuation pattern significantly reduces energy consumption compared to the constant energization required by magnetic valves, while still achieving reliable fluid control for beverage preparation.
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 pinch valve solution enables more efficient, cost-effective, and hygienic beverage preparation by allowing precise control of fluid flow, reducing contamination risk, and enabling longer switching travels, thus supporting the preparation of various beverages like coffee and milk without constant energization.
Implementation Method 1
at least one pinch valve, which is arranged in the fluid line system of the beverage preparation machine, encompasses at least two fluid passage lines and is designed to execute valve and/or control functions on the fluid passage lines
Implementation Method 2
an activating mechanism is thereby present for the coupled activation of the valve and/or control functions of the two fluid passage lines
Data Source
AI summary
A beverage preparation machine has at least one pinch valve (1) in the fluid line system, wherein the pinch valve (1) has at least two fluid passage lines (20, 21) and is designed to execute valve and/or control functions on the fluid passage lines (20, 21). The operating mechanism of the pinch valve (1) is set up for coupled activation of the valve and/or control functions and a drive with a stepper motor (25) is provided.