Fully automatic coffeemaker with tolerance accommodation at the heating element
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Solution Overview
Problem
Fully automatic coffee machines face deformation issues due to brewing pressure, leading to stress on seals and material wear, which requires rigid construction and tight tolerances, increasing material intensity and costs.
Innovation Solution
The brewing piston is mounted in a bearing that offers at least two translational and three rotational freedoms, allowing it to tilt and displace relative to the housing, reducing deformation stress and preventing jamming between the brewing chamber and piston, thereby extending seal life and reducing material usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing and brewing device are made rigid with tight tolerances to prevent deformation, then the structural stability and sealing reliability are improved, but the material intensity and manufacturing costs increase
Solution Approach 1:
The brewing piston is mounted on a bearing that allows it to move dynamically relative to the brewing chamber, enabling automatic compensation for deformations under brewing pressure without requiring rigid housing construction or tight tolerances
Solution Approach 2:
The bearing provides translational and rotational freedoms that change the positional parameters of the brewing piston, allowing it to adapt to dimensional changes in the brewing chamber caused by pressure and temperature variations during operation
2Stability of the object's composition
If the brewing piston is rigidly mounted to prevent movement, then the structural stability is improved, but the seal deformation stress increases and seal life decreases
Solution Approach 1:
The bearing-mounted brewing piston can dynamically adjust its position and orientation relative to the brewing chamber, maintaining stable sealing contact despite chamber deformation under brewing pressure, thereby extending seal life
Solution Approach 2:
The bearing acts as an intermediary between the brewing piston and the housing, absorbing deformation stresses and preventing them from being transmitted to the seal between the piston and brewing chamber
3Reliability
If the brewing chamber and piston are designed with tight tolerances to prevent jamming, then the operational reliability is improved, but the manufacturing precision requirements and costs increase
Solution Approach 1:
The bearing provides translational and rotational freedoms that enable the brewing piston to dynamically compensate for tolerance variations and dimensional changes, preventing jamming without requiring tight manufacturing tolerances
Solution Approach 2:
The bearing changes the positional and orientational parameters of the brewing piston, allowing it to adapt to manufacturing variations and prevent jamming between the brewing chamber and piston during operation
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
A fully automatic coffeemaker for domestic use comprising a heating device and a housing for same, in which a powered and movable heating chamber is located and to which a fixedly mounted heating element is secured, is improved by placing the heating element in a mounting that has at least one degree of freedom.