Handheld Burning Device Safety via Nested Tube Design
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Solution Overview
Problem
Conventional handheld burning devices are limited by their short metal outer tube length, leading to safety concerns and user fear due to the proximity of the user's hand to the heated object.
Innovation Solution
A handheld burning device with a diversion mechanism, nozzle, mixing inner tube, ignition mechanism, and metal outer tube, where the mixing inner tube is designed to be longer by optimizing the aperture and inner diameter ratios, allowing for a longer operational length while maintaining safety and functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the metal outer tube length is increased to improve safety and reduce user fear, then the safety and user comfort are improved, but the structural design becomes more complex and difficult to manufacture
Solution Approach 1:
The patent applies nesting by placing the mixing inner tube inside the metal outer tube, creating a nested structure where the inner tube is housed within the outer tube. This allows the outer tube to be longer for safety while the inner tube maintains its functional length, resolving the contradiction between safety and structural complexity.
Solution Approach 2:
The patent segments the burning device into distinct functional components: the metal outer tube for safety and structure, and the mixing inner tube for fuel mixing and combustion. This segmentation allows each component to be optimized independently, enabling the outer tube to be longer without complicating the overall structure.
2Object-affected harmful factors
If the mixing inner tube length is increased to improve safety distance, then the safety is improved, but the operation may be affected
Solution Approach 1:
The patent applies parameter changes by optimizing the aperture size (0.17-0.19 mm) and the ratio between inner diameter and aperture (28-33 times). These parameter adjustments ensure that the longer mixing inner tube (60-100 mm) maintains proper fuel mixing and combustion characteristics, preventing operational issues while achieving safety goals.
3Stability of the object's composition
If the aperture size is reduced to optimize the inner diameter ratio, then the mixing efficiency is improved, but the fuel flow may be restricted
Solution Approach 1:
The patent applies parameter changes by precisely controlling the aperture size within the range of 0.17-0.19 mm and the inner diameter ratio within 28-33 times. These optimized parameters balance fuel flow restriction with mixing efficiency, ensuring adequate fuel delivery while achieving proper atomization and combustion.
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 enhances safety and reduces user fear by allowing a longer mixing inner tube without compromising operation, addressing the limitations of conventional devices.
Implementation Method 1
An outlet of the nozzle has an aperture being within a range from 0.17 mm to 0.19 mm
Implementation Method 2
The mixing inner tube has two ends that are respectively defined as a first end and a second end. The first end is arranged adjacent to the outlet of the nozzle
Implementation Method 3
The ignition mechanism has an ignition end and a manipulation end. The ignition end is arranged adjacent to the second end of the mixing inner tube
Implementation Method 4
The metal outer tube is sleeved around the mixing inner tube. The second end of the mixing inner tube is arranged in the metal tube
Data Source
AI summary
A handheld burning device includes a diversion mechanism, a nozzle connected to the diversion mechanism, a mixing inner tube arranged adjacent to an outlet of the nozzle, an ignition mechanism, and a metal outer tube that is sleeved around the mixing inner tube. The outlet of the nozzle has an aperture being within a range from 0.17 mm to 0.19 mm, an inner diameter of the mixing inner tube is within a range from 28 times to 33 times of the aperture, a length of the mixing inner tube is within a range from 60 mm to 100 mm, and a length of the metal outer tube is greater than the length of the mixing inner tube and is within a range from 90 mm to 140 mm.