Curved-Blade Coffee Dispenser for Low-Torque Ground Dosing
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Solution Overview
Problem
Existing coffee machine designs with ground coffee dispensers require powerful motors due to the compaction of coffee grounds by rotating blades, leading to increased size and cost, and the transfer mechanism often necessitates separating the storage reservoir from the filter holder, complicating the machine's dimensions.
Innovation Solution
A ground coffee dispenser with a disk and curved blades that guide coffee without opposition, reducing forces on the disk and allowing a smaller, less powerful motor, and a bell-shaped design to prevent compaction and facilitate easy handling, with a transfer aperture below the disk to maintain flow and simplify the design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the ground coffee distributor uses curved blades that push coffee against the inner wall to define peripheral space, then the quantity of ground coffee poured can be controlled, but the compaction of ground coffee increases and forces on the blades increase, requiring a more powerful motor
Solution Approach 1:
Instead of pushing coffee outward against the wall to define the peripheral space, the blades are designed to pull coffee inward toward the disk center. This reverses the traditional direction of force application, allowing the peripheral space to be defined by the blade geometry and rotation rather than by outward pushing forces, thereby reducing blade forces while maintaining precise coffee quantity control.
Solution Approach 2:
The blade geometry is optimized with specific curvature radii and angles that change along the blade length. The first curvature radius varies along the radial direction, and the second curvature radius varies along the tangential direction, allowing the blades to efficiently move coffee with reduced forces while maintaining precise metering of the peripheral space volume.
2Reliability
If a powerful motor is used to drive the disk against compacted coffee, then the ground coffee can be transferred reliably, but the motor size and cost increase
Solution Approach 1:
The force direction is inverted so that blades pull coffee inward rather than push outward. This reduces the opposing force that the motor must overcome, allowing reliable coffee transfer with a smaller, less powerful motor, thereby reducing motor size and cost while maintaining transfer reliability.
Solution Approach 2:
The curved blade design with variable curvature radii optimizes the flow path of ground coffee, reducing resistance and compaction. The smooth curved surfaces guide coffee efficiently toward the filter holder aperture, ensuring reliable transfer with minimal force requirements from the motor.
3Ease of operation
If the transfer aperture is placed on the inner wall of the contour, then ground coffee transfer can be achieved, but the storage reservoir must be separated from the filter holder, increasing machine dimensions
Solution Approach 1:
The transfer aperture is relocated to the bottom of the storage reservoir, allowing the filter holder to be positioned directly beneath the reservoir. This merging of the transfer point with the reservoir bottom enables vertical alignment and integration of components, eliminating the need for lateral separation and reducing overall machine dimensions while maintaining ease of coffee transfer.
Solution Approach 2:
The transfer aperture position is changed from a lateral position on the inner wall to a vertical position at the bottom of the reservoir. This dimensional change allows the filter holder to be positioned directly below, enabling vertical coffee flow and compact integration of the storage reservoir and filter holder, thereby reducing the horizontal footprint and overall machine dimensions.
4Measurement precision
If the disk periphery is inscribed in a diameter to define peripheral space, then precise coffee measurement is achieved, but the forces on the disk increase
Solution Approach 1:
Instead of defining the measurement perimeter by pushing coffee outward against the wall, the system defines the peripheral space volume through the inward-pulling action of the blades. The disk diameter inscribed in the periphery establishes the measurement boundary, but the inward force direction reduces the forces acting on the disk while maintaining precise volume definition through blade geometry and rotation.
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 solution enables precise coffee measurement, reduces motor torque requirements, and allows for a compact, cost-effective coffee machine design without the need for a separate motor transmission system, enhancing operational efficiency and ease of maintenance.
Implementation Method 1
a ground coffee distributor pouring a predefined quantity of ground coffee from the storage reservoir towards a brewing area
Data Source
AI summary
A ground coffee dispenser intended to cooperate with a coffee machine, includes a ground coffee storage reservoir provided with a contour and a bottom, and a ground coffee distributor pouring a predefined quantity of ground coffee from the reservoir into a brewing area of the machine. The distributor includes a disk driven in rotation, curved blades being attached onto a lower face of the disk. The quantity of ground coffee poured is defined by a peripheral space provided between the diameter of the periphery of the disk and an inner wall of the contour, close to the bottom of the storage reservoir. The bottom of the reservoir includes an opening for transferring the ground coffee arranged under the disk. The curved blade extends from the periphery towards the inside of the disk to transfer the ground coffee admitted by the peripheral space into the transfer opening when the disk rotates.