Drum Roaster Airflow Layout for Stable Roasting Pressure
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Solution Overview
Problem
Existing drum roasters face issues with fluctuating low-pressure conditions in the roasting drum due to ambient dependency on electric heating elements with suction fans, leading to inconsistent roasting results.
Innovation Solution
The arrangement of a feed air fan upstream of the electric heating element and a suction fan downstream of the roasting drum, combined with a control system, ensures a uniform air flow and reliable cooling, allowing for precise temperature control and energy-efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an electric heating element with a suction fan is used to heat air for roasting, then the heating function is achieved, but the low-pressure conditions in the roasting drum fluctuate considerably due to ambient conditions
Solution Approach 1:
The patent divides the air supply function into two separate fans: a feed air fan for supplying ambient air to the heating element, and a suction fan for extracting heated air into the roasting drum. This segmentation isolates the heating process from ambient pressure fluctuations, stabilizing the low-pressure conditions in the drum while maintaining effective heating.
2Ease of operation
If a blower is placed in front of an electric heating element to feed heating air into the roasting drum, then air flow is improved, but the heating air becomes even more difficult to control
Solution Approach 1:
The patent employs two independently controllable fans (feed air fan and suction fan) that can be dynamically adjusted to maintain optimal air flow and pressure conditions. This dynamic control system allows precise regulation of heating air characteristics, improving consistency while maintaining ease of operation through independent fan control.
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 provides consistent roasting results by maintaining a stable air flow and temperature, enhancing user control and safety, while being cost-effective and energy-efficient.
Implementation Method 1
at least one electric heating element, which is arranged in a heating tube upstream of the roasting drum, as viewed in the flow direction of the heating air, for heating supply air
Implementation Method 2
a suction fan, which is arranged downstream of the roasting drum, as viewed in the flow direction of the heating air, for extracting the heating air from the roasting drum
Implementation Method 3
The feed air fan is arranged upstream of the at least one electric heating element as seen in a flow direction of the feed air
Data Source
AI summary
A drum roaster for roasting beans. The drum roaster includes a housing assembly in which a roasting drum for receiving the beans is rotatably supported, a drive device for rotating the roasting drum, and a heating assembly for heating the beans at least via a heating air. The heating assembly includes an electric heating element for heating a feed air, a suction fan for extracting the heating air out of the roasting drum, and a feed air fan to supply the feed air.The electric heating element is arranged in a heating tube upstream of the roasting drum as seen in a flow direction of the heating air. The suction fan is arranged downstream of the roasting drum as seen in the flow direction of the heating air. The feed air fan is arranged upstream of the electric heating element as seen in a flow direction of the feed air.