Heat Gun Flow Passage With Guiding Protrusions for Even Flame
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Solution Overview
Problem
Conventional high power gas heat guns suffer from uneven flame distribution, inefficient combustion, high risk of user burns due to concentrated heat, pressure losses, noise, and difficulty in aiming due to turbulent flows and susceptibility to wind, leading to poor precision and increased NOx and CO emissions.
Innovation Solution
A heat gun design with a head portion featuring a flow passage having an inlet, outlet, and flow guiding protrusions that reduce backward flows and turbulence, enhancing combustion efficiency, flow capacity, and even heat distribution, while allowing a wider flame exit for improved precision and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the width of the flame exit end is increased to heat large areas quickly, then the heating area is improved, but the flame distribution becomes uneven and heat concentrates in a small region
Solution Approach 1:
The flow passage is divided into multiple sections: inlet portion, flow guiding portion with protrusions, and outlet portion. This segmentation allows different zones to perform specific functions - the flow guiding protrusions create multiple flow paths that distribute flame evenly across the wide exit, preventing concentration in a single region while maintaining large heating area
Solution Approach 2:
The flow guiding protrusions create localized flow control zones within the passage. Each protrusion modifies the local flow characteristics to ensure uniform velocity distribution across the outlet, allowing different regions of the wide flame exit to contribute evenly to heating without creating hot spots
2Power
If high pressure gas is used to increase heat power, then the heating power is improved, but turbulence increases causing noise and making flow control difficult
Solution Approach 1:
The flow guiding protrusions feature curved outer peripheries that guide gas flow smoothly around bends. These curved surfaces reduce flow separation and turbulence that would otherwise occur with sharp edges, allowing high pressure gas to flow smoothly at high power settings while minimizing noise generation
3Stability of the object's composition
If the flame flows at low speed to maintain stability, then the flame stability is improved, but the flame is susceptible to distortion by thermal buoyancy and wind
Solution Approach 1:
The flow passage geometry is optimized to achieve the right balance of flow velocity and stability. The gradual expansion and specific curvature of the passage maintain laminar flow characteristics while achieving sufficient exit velocity (greater than 10 m/s) to resist wind and buoyancy effects, allowing precise aiming without sacrificing flame stability
4Power
If the exit of the mixing chamber is widened to increase heat power, then the heat power is improved, but flow control capability decreases
Solution Approach 1:
The flow passage design creates dynamic flow control through its geometric progression. The gradual expansion from inlet to outlet, combined with strategically positioned flow guiding protrusions, maintains flow attachment and control even at wide exit dimensions. This dynamic geometry allows the passage to adapt flow patterns to maintain control capability while delivering high heat power
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 design improves combustion efficiency, reduces noise and pressure drops, allows for even heat distribution, and enhances user safety by preventing burns and improving aiming precision, even in windy conditions, while maintaining a higher flow capacity and wider heat application area.
Implementation Method 1
The flow passage includes two flow guiding protrusions disposed at the flow guiding portion... The two flow guiding protrusions extend oppositely along the long sides
Implementation Method 2
The high pressure gas is spewed at a high velocity out of a gas nozzle in the venturi tube, which causes outside air to flow to the venturi tube
Implementation Method 3
If the flame flows at a speed which is too low, the flame is susceptible to distortion under thermal buoyant effects... the flame, which flows too slow, may burn backward toward the user
Data Source
AI summary
A heat gun includes a head portion. The head portion defines a flow passage having an inlet end at one end and an outlet end at another opposite end, and includes an inlet portion, an outlet portion and a flow guiding portion disposed between the inlet and outlet ends. The outlet portion is formed with two long sides and two short sides. The flow guiding portion is disposed between the inlet and outlet portions. The flow passage includes two flow guiding protrusions disposed at the flow guiding portion. The two flow guiding protrusions are disposed oppositely and extend oppositely along the long sides.