Pellet Burner Rotary Combustion Chamber Air Control
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Solution Overview
Problem
Existing pellet burners lack effective control over the amount of air supplied to the combustion chamber, leading to over-oxidation or under-oxidation, which affects the efficiency and economics of combustion.
Innovation Solution
A rotary combustion chamber with a cylindrical, fixed cover and a ring-shaped duct for air supply, featuring a series of swingable obstructing strips and a control ring that selectively opens and closes air inlet holes to allow continuous adjustment of air flow, ensuring precise matching of fuel and air mixture throughout combustion phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If air supply to combustion chamber is not controlled, then burner structure is simple, but combustion efficiency deteriorates due to over-oxidation or under-oxidation
Solution Approach 1:
The patent applies the dynamics principle by making the combustion chamber rotary instead of fixed, and by introducing swingable obstructing strips that can dynamically adjust air inlet holes. The control ring with cam mechanism enables continuous adjustment of air supply during rotation, transforming a static structure into a dynamic system that optimizes combustion efficiency while maintaining structural simplicity.
2Productivity
If air supply is increased to improve combustion, then combustion efficiency improves, but fuel and air mixture balance deteriorates leading to over-oxidation
Solution Approach 1:
The patent implements feedback control through the cam mechanism on the control ring that automatically adjusts the position of obstructing strips based on the rotational position of the combustion chamber. This creates a closed-loop system where air supply is continuously modulated to maintain optimal fuel-air mixture composition throughout the combustion process, preventing both over-oxidation and under-oxidation.
Solution Approach 2:
The patent applies parameter changes by continuously varying the air inlet hole opening area through the swingable obstructing strips during combustion chamber rotation. The cam mechanism translates rotational position into precise control of air flow parameters, allowing dynamic adjustment of the fuel-air mixture ratio to maintain optimal combustion conditions throughout all phases.
3Device complexity
If fixed combustion chamber is used, then device complexity is low, but adaptability to different combustion phases deteriorates
Solution Approach 1:
The patent transforms the fixed combustion chamber into a rotary structure with adjustable air inlet holes controlled by swingable obstructing strips. This dynamic configuration allows the combustion chamber to adapt to different combustion phases (ignition, burning, suppression) by varying air supply, while the overall device structure remains relatively simple and compact.
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
Enables continuous adjustment of air supply to the combustion chamber, optimizing aeration and maintaining the optimal fuel and air mixture composition from ignition to fire suppression, enhancing the burner's efficiency and combustion parameters.
Implementation Method 1
a series of swingable obstructing strips and a control ring that selectively opens and closes air inlet holes to allow continuous adjustment of air flow
Implementation Method 2
a ring-shaped duct for air supply, featuring a series of swingable obstructing strips and a control ring that selectively opens and closes air inlet holes
Implementation Method 3
optimizing aeration and maintaining the optimal fuel and air mixture composition from ignition to fire suppression
Data Source
Figure 1~2
Figure 2a~2b
Figure 3~4
AI summary
An aeration mechanism of a combustion chamber in a pellet burner concerns a burner comprising a steel body (1) with an inlet hole (2) for pellets and a rotary combustion chamber (3), surrounded by a cylindrical, fixed cover (4) permanently connected with the body, in addition, a space between the combustion chamber and the cover is a ring-shaped duct (conduit) (5) supplying air to the combustion chamber throughout the inlet holes (6) and/or inflating nozzles placed on its circumference. In a solution according to the invention the rotary combustion chamber has several longitudinal diaphragms (7) arranged in a form of shutters swingably mounted on the outer surface of the combustion chamber and obscuring the inlet holes of air, working together with a fixed control ring (8) situated perpendicularly to the longitudinal axis of the chamber around its rear part, in addition, an inner surface (9) of the control ring has a shape of arcs of two radius (R, r) connected with each other by short, straight segments and functions as a cam pressing the diaphragms to the combustion chamber surface or releasing them in accordance with a sequence of the preset phases. The combustion chamber has a form of a prism or a truncated pyramid a base of which is a regular polygon. The diaphragms are arranged in twos on either side wall (10) of the combustion chamber.