Silicone Outlet Valve for Durable Food-Safe Beverage Pumps
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Solution Overview
Problem
Existing beverage pumps, particularly those used in household appliances like beverage vending machines, face challenges in achieving food conformity and durability due to material limitations, especially with conventional outlet valves prone to cracking and adhesion issues.
Innovation Solution
The outlet valve is made of silicone or poly(organo)siloxane, with a compression chamber unit made of food-grade polypropylene, and features a design that minimizes adhesion and material loss, ensuring a robust and food-safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a beverage pump is integrated into a beverage container, then beverage dispensing is enabled, but the pump components are exposed to the beverage and require cleaning, increasing cleaning complexity
Solution Approach 1:
The pump components (pump housing, piston, seals) are extracted from the beverage environment and enclosed within a sealed pump chamber that is fluid-tightly separated from the beverage container. This allows the pump mechanism to perform its function while being protected from direct beverage contact, thereby reducing cleaning complexity.
Solution Approach 2:
A fluid-tight separation membrane or seal acts as an intermediary between the beverage and the pump components. This intermediary allows the pump to operate on the beverage without direct contact, enabling beverage dispensing while preventing contamination of pump parts that would require cleaning.
2Ease of manufacture
If the pump is designed to be fluid-tight separated from the beverage, then cleaning effort is reduced, but the structure becomes more complex
Solution Approach 1:
The pump chamber is merged with the closure structure of the beverage container, integrating the sealed pump housing into the existing cap assembly. This consolidation reduces overall structural complexity while maintaining fluid-tight separation, as the pump chamber walls serve dual purposes as both pump enclosure and closure components.
Solution Approach 2:
The pump chamber structure serves multiple functions: it encloses the pump mechanism, provides fluid-tight separation from the beverage, and integrates with the closure assembly. This multi-functionality reduces the need for additional separate components, thereby simplifying the overall structure while achieving cleaning ease.
3Ease of operation
If the piston rod passes through the pump head, then the piston can be actuated, but beverage can penetrate along the piston rod into the drive mechanism
Solution Approach 1:
The piston rod is nested within a sealed bearing housing or seal chamber that is fluid-tightly enclosed. The piston rod passes through a sealed interface (such as a magnetic coupling or sealed bearing) that prevents beverage penetration while allowing rotational or reciprocating motion, thus protecting the drive mechanism from beverage contact.
Solution Approach 2:
A sealed bearing or magnetic coupling acts as an intermediary between the piston rod and the drive mechanism. This intermediary component allows mechanical actuation to be transmitted through the piston rod while maintaining fluid-tight separation, preventing beverage from penetrating along the piston rod into the drive mechanism.
4Reliability
If seals are used to prevent beverage penetration, then reliability improves, but wear of seals increases device complexity and maintenance needs
Solution Approach 1:
Mechanical seals are replaced with magnetic coupling mechanisms that transmit rotational or reciprocating motion through magnetic fields without physical contact. This substitution eliminates seal wear and the associated maintenance requirements while maintaining reliability by preventing beverage penetration through magnetic rather than mechanical means.
Solution Approach 2:
Magnetic fields act as intermediaries to transmit mechanical motion without physical contact across the fluid-tight barrier. This intermediary mechanism eliminates the need for wearing seals while maintaining reliable beverage penetration protection, as the magnetic coupling transfers force through the sealed interface without degradation.
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 configuration enhances the durability and food safety of the beverage pump, providing a long service life and cost-effective solution with reduced material degradation.
Implementation Method 1
the piston rod is magnetically coupled to the drive mechanism
Implementation Method 2
the piston rod is provided with a resilient seal element
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The invention is based on a beverage pump, in particular an oscillating piston pump, for a domestic appliance (12), in particular for a beverage machine, for the purpose of conveying a liquid, comprising a working piston (14), comprising a pumping chamber (16), in which the working piston (14) is axially movably guided and which, when a working piston (14) is fitted in place, has a pre-chamber (22), a pressure chamber (24) and an outlet chamber (26), comprising a magnetic actuator (20), which is intended to provide a magnetic field for driving the working piston (14), and comprising an outlet valve (18), which is arranged, in terms of flow, between the pressure chamber (24) and the outlet chamber (26) and which has at least one compression-chamber unit (28) and at least one valve element (30). It is proposed that the valve element (30) should consist at least predominantly of silicone.