Hot Air Generator Pressure Control for Safe Low-Air Operation
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Solution Overview
Problem
Existing hot air generators face high consumption of compressed air and safety concerns due to potential gas transport without air, necessitating a more efficient and safe solution.
Innovation Solution
A portable hot air generator with a servocontrolled pressure regulator that adjusts gas pressure based on air pressure, incorporating a venturi and a stabilized flame burner to reduce compressed air consumption and prevent gas outflow without air outflow, enhancing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If compressed air is projected towards the flame to transfer calories, then hot air is generated for heating materials, but compressed air consumption increases significantly
Solution Approach 1:
The system uses the flame itself to heat the compressed air rather than using additional external heating means. The compressed air passes through the flame zone and is heated directly by the combustion process, making the flame serve dual purposes: providing heat for the material and heating the air stream.
Solution Approach 2:
The compressed air acts as an intermediary medium that transfers thermal energy from the flame to the material being heated. The air absorbs calories from the flame and delivers them to the material, optimizing heat transfer efficiency.
2Ease of operation
If gas is transported into the burner without compressed air, then gas may leak out of the generator, but the system needs to remain operational
Solution Approach 1:
The system prevents gas leakage by ensuring that compressed air is always present in the burner before gas is introduced. The air flow acts as a protective barrier that prevents unburned gas from escaping, and the interlock system prevents gas valve activation unless air flow is detected.
Solution Approach 2:
The system uses feedback from air flow detection (via the venturi effect or flow sensors) to control gas valve activation. The gas supply is automatically regulated based on the presence and magnitude of air flow, ensuring safe operation conditions are met before allowing gas introduction.
3Quantity of substance
If a venturi is added to reduce compressed air consumption, then air efficiency improves, but device complexity increases
Solution Approach 1:
The venturi utilizes pneumatic principles to create a pressure differential that draws in additional air or optimizes the air flow through the burner. The converging-diverging nozzle geometry converts pressure energy to kinetic energy and back, creating suction or pressure effects that enhance air utilization without requiring additional powered components.
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 reduces compressed air consumption and ensures safe operation by controlling gas outflow, preventing gas transport without air, thereby improving efficiency and safety.
Implementation Method 1
a venturi upstream from the flame generating means, formed on the elongated nozzle
Implementation Method 2
means for generating a flame inside the elongated nozzle
Implementation Method 3
to transfer calories to the compressed air which flows out of the generator in a hot condition
Implementation Method 4
a servocontrolled pressure regulator controlling gas pressure in the gas conduit depending on air pressure in the air conduit
Data Source
AI summary
A hot air generator comprising a handle (12), an elongated nozzle (14), flame generating means (6), a venturi (4), a gas conduit (162) intended to bring a combustible gas into the elongated nozzle (14) and at the flame generating means (6), an air conduit (164) intended for bringing compressed air into the elongated nozzle (14) and downstream from the venturi;characterized in that the generator further comprises a servocontrolled pressure regulator (2) controlling a gas pressure (Pd.g) in the gas conduit (162) depending on an air pressure (Pd.a) in the air conduit (164).