Coffee Grinder Flow Control Partition for Uniform Dose Dispensing
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Solution Overview
Problem
On-demand grinder-dosers for espresso machines often produce irregular and pulsed flows of ground coffee, leading to inconsistent coffee doses due to burr design and electrostatic charges, affecting beverage quality.
Innovation Solution
A device with a pivotally mounted partition and an elastic member, such as a spring, controls the flow of ground coffee by increasing resistance and ensuring a uniform discharge into the portafilter, using a calibrated spring force to maintain flow consistency until the required dose is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If an on-demand grinder-doser is used to dispense ground coffee directly into the portafilter, then the dosing process is simplified and automated, but the flow of ground coffee becomes irregular and pulsed, leading to dose inconsistency
Solution Approach 1:
A flow control device is introduced as an intermediary component in the discharge channel. This device includes a movable closure element that acts as a mediator between the grinding chamber and portafilter, regulating the irregular coffee flow to produce consistent dosing while maintaining the automated on-demand system
Solution Approach 2:
The flow control device changes the flow parameters of ground coffee by adjusting the cross-sectional area of the discharge opening. The closure element moves to modify the opening size, transforming the irregular pulsed flow into a uniform steady flow, thereby achieving dose consistency without sacrificing automation
2Manufacturing precision
If the discharge opening size is reduced to improve flow uniformity, then dose consistency improves, but the dispensing time increases and productivity decreases
Solution Approach 1:
The flow control device employs a dynamic closure element that can adjust the discharge opening size during operation. Rather than using a fixed small opening, the dynamic adjustment allows the system to optimize both flow uniformity and dispensing speed, maintaining dose consistency while avoiding excessive dispensing times
Solution Approach 2:
The closure element is positioned and adjusted in advance to optimal settings before dispensing begins. This preliminary configuration ensures that the discharge opening is pre-optimized for both uniform flow and adequate dispensing speed, eliminating the need to choose between dose uniformity and productivity
3Reliability
If electrostatic charge accumulates in ground coffee grains during flow through the conduit, then the coffee grains may partially block the discharge channel, but increasing channel resistance would further disrupt flow uniformity
Solution Approach 1:
The flow control device serves as an intermediary that manages the electrostatically charged coffee grains. The controlled discharge opening and closure mechanism prevent grain accumulation and blocking while maintaining smooth uniform flow, resolving the conflict between flow continuity and flow uniformity
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
Ensures a consistent and uniform delivery of the precise coffee dose, reducing variations and improving the quality of the dispensed beverage by regulating the flow through the grinder-doser's discharge channel.
Implementation Method 1
an elastic member, such as a spring, controls the flow of ground coffee by increasing resistance and ensuring a uniform discharge into the portafilter, using a calibrated spring force to maintain flow consistency
Data Source
Figure 1
Figure 2~3
AI summary
A device for imparting uniformity to the flow of ground coffee that comes from an "on-demand" grinder-doser (1) and directed, under the dispensing thrust of the latter, when in operation, toward the portafilter (7) of an espresso coffee machine, in which said flow is collected until the amount corresponding to the dose required for beverage formation is reached, whereupon the grinder-doser stops. The device comprises a tubular conduit (5) for said flow, an opening (6) through which the flow is discharged, which is placed in the conduit in a point that overlies the location (8) in which the portafilter (7) is placed for receiving said flow of ground coffee. The section of said opening, as viewed transverse to the axis of the conduit (5) for said flow of ground coffee, has a contour that extends along a closed line. The device comprises a partition (12) connected to portion (13) of the contour of said opening (6) and able to angularly move toward the exterior of the opening between at least two angularly offset positions under the thrust of said flow of ground coffee and against elastic means (15). Said elastic means comprise means (18) for adjusting the intensity of the elastic forces exerted thereby. Once the flow has been compacted against said partition (12) it becomes a smooth, fluctuation-free flow and the amount of ground coffee that is received in the portafilter (7) during operation of the grinder-doser actually corresponds to the required dose.