Residual Fuel Detection Arm for Solid Heater Accuracy
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Solution Overview
Problem
Current solid fuel heater devices for detecting the residual fuel layer are inaccurate and unreliable, leading to issues such as shortened glowing time, excess air, increased pollutant production, and reduced heater lifespan due to either under or overestimation of the residual layer.
Innovation Solution
A rotating detection arm within the fuel chamber, connected to a detection deflection element with a weight and pressing mechanism, which overcomes torque to accurately detect the residual layer volume and control combustion air supply, preventing fuel wedging during loading and enhancing operational reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detection methods based on flue gas temperature, time lapse, oxygen amount, or light radiation intensity are used, then the residual layer can be detected, but the accuracy and reliability are relatively low
Solution Approach 1:
The patent replaces complex sensor-based detection systems (temperature, oxygen, light sensors) with a simple mechanical detection arm that physically senses the residual fuel layer. The detection arm rotates based on direct contact with the fuel layer, providing accurate and reliable mechanical measurement without the inaccuracies of indirect sensor-based methods.
Solution Approach 2:
The detection arm acts as an intermediary element between the fuel layer and the detection mechanism. It directly contacts the residual fuel layer and transmits this information through rotation, serving as a mediator that converts the physical presence of fuel into a detectable signal without requiring complex sensing systems.
2Measurement precision
If a moving bottom is used to detect residual layer mass, then accuracy and reliability improve, but the design complexity and cost increase
Solution Approach 1:
The patent extracts the detection function from the complex moving bottom system and implements it through a simple rotating detection arm. This separates the detection mechanism from the fuel loading system, allowing accurate residual layer detection without requiring a complex moving bottom design, thus reducing overall system complexity.
Solution Approach 2:
Instead of using a complex moving bottom system, the patent creates a simplified copy of the detection function through the rotating detection arm. The arm replicates the detection capability of a moving bottom system but with much simpler construction, achieving the same measurement precision without the complexity and cost of a fully movable bottom design.
3Ease of operation
If the detection arm is not pressed against the fuel chamber wall during loading, then fuel can be loaded, but the detection arm may be wedged and prevent proper fuel filling
Solution Approach 1:
The pressing element performs a preliminary action by pressing the detection arm against the fuel chamber wall before fuel loading begins. This preliminary pressing action prevents the detection arm from being wedged during subsequent fuel loading, ensuring smooth fuel filling while maintaining detection arm reliability for accurate residual layer detection.
Solution Approach 2:
The pressing element applies a preliminary counteracting force to prevent the harmful effect of the detection arm being wedged. By continuously pressing the arm against the wall during loading, the system preemptively counteracts the wedging force that would otherwise prevent proper fuel filling and compromise detection reliability.
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 provides accurate and reliable detection of the optimum residual layer volume, optimizing heater performance, reducing pollutant production, and extending heater and chimney lifespan while minimizing construction complexity and costs.
Implementation Method 1
the detection arm is connected to the detection deflection element. The detection deflection element includes an outer arm which is firmly connected to the detection arm, wherein the outer arm is led out of the fuel chamber of the heater, and a weight is attached on the outer arm
Implementation Method 2
a pressing element which consists of a cam associated with the outer arm and connected to a loading door by means of a rod
Data Source
Figure 1~4
Figure 5~8
AI summary
The device comprises a detection arm (7) pivotally placed in the fuel chamber (1) of a heater (20), wherein the end portion (7.1) of the detection arm (7) defines the level of the residual layer (8) of fuel (2), wherein the detection arm (7) is connected to a detection deflection element (4). The detection deflection element (4) comprises an outer arm (10) which is firmly connected to the detection arm (7), wherein the outer arm (10) is led out of the fuel chamber (1), and wherein a weight (11) is attached to the outer arm (10). The outer arm (10) is connected to a position sensor (6) or an air flap. From the point of view of comfort loading of fuel to the fuel chamber (1), a pressing element (16) is associated with the detection deflection element (4). The pressing element (16) comprises a cam (15) added to the outer arm (10), wherein the cam (15) is connected to the loading door (12) by means of a rod (14).