Venturi Burner Movable Part Modulation
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Solution Overview
Problem
Existing gas premix burner devices face difficulties in maintaining a sufficient depression signal when the flow rate is reduced, as the depression evolves with the square of the flow rate, making it challenging to achieve high modulation rates without external energy sources or mechanical systems.
Innovation Solution
The gas premix burner device incorporates a movable part within the Venturi system, driven by a suction fan and a return spring, which modifies the air and gas passage sections through conical surfaces and protruding elements, allowing for automatic adaptation of flow rates without external energy sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flow rate is reduced in a pre-mixed gas burner with Venturi effect, then the modulation capability is improved, but the depression signal becomes insufficient
Solution Approach 1:
The patent applies the dynamics principle by making the Venturi tube movable rather than fixed. The Venturi tube is positioned on a movable support that allows it to translate along the gas flow direction. This movement dynamically adjusts the Venturi effect intensity: at low flow rates, the Venturi tube moves to optimize the depression signal, while at high flow rates, it adjusts to maintain proper mixing ratios. This dynamic positioning resolves the contradiction by enabling sufficient depression signal even when overall flow rate is reduced, thereby improving modulation capability without sacrificing depression strength.
2Stress or pressure
If mechanical systems with servomotors or solenoids are used to vary intake sections, then the depression remains important at reduced flow, but the device complexity increases
Solution Approach 1:
The patent applies the self-service principle by designing a system where the Venturi tube automatically adjusts its position based on flow conditions without requiring external control systems. The movable support allows the Venturi tube to respond autonomously to changes in gas flow, optimizing the depression signal and mixing ratio automatically. This eliminates the need for servomotors, solenoids, or other complex mechanical control systems, thereby maintaining sufficient depression at reduced flow rates while avoiding increased device complexity.
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 solution ensures consistent depression and modulation of flow rates across varying conditions, enabling high modulation rates without the need for external energy sources or mechanical systems, thereby improving the burner's operational efficiency.
Implementation Method 1
creates a depression on the gas valve
Implementation Method 2
a Venturi interposed between said injector and said fan so as to create a vacuum on said gas valve
Implementation Method 3
the cooperation of said protruding elements with said openings being achieved through surfaces conical, so that the depth of insertion of said protruding elements in said openings makes it possible to modify the dimensions of the passages, and therefore to modulate the flow rates
Implementation Method 4
a moving part, able to move under the action of said fan and a return spring
Data Source
Figure 1
Figure 2
AI summary
A gas premix burner device comprising a fan (1) for drawing in the air/gas mixture, a gas supply valve (2), a gas injector (3), and a venturi (4) interposed between the injector (3) and the fan (1) to create a vacuum on the gas valve (2). The venturi (4) has a movable part (40) capable of moving under the action of the fan (1) and a return spring (43), the movement of the movable part being capable of modifying the cross-sections of the gas (G) and air (A) passages (41, 42).