Vulcanization Device Venturi Injector Mixing
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Solution Overview
Problem
Existing vulcanizing devices face issues with non-uniform heat transfer and pressure distribution due to stratification of steam and nitrogen mixtures, leading to overcuring and defective tire curing, as previous solutions like simultaneous injection or pre-mixing outside the bladder result in incomplete mixing and condensate accumulation.
Innovation Solution
A vulcanizing device with a Venturi-effect injector that mixes steam and pressurized gas outside the curing chamber before introduction, ensuring a homogeneous mixture is maintained throughout the curing process, using a combination of steam for heat and nitrogen or air for pressure regulation, preventing stratification and condensate formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If steam and nitrogen are injected simultaneously into the bladder, then the curing process can begin, but the gases stratify and temperature becomes non-uniform
Solution Approach 1:
The patent applies preliminary action by pre-mixing steam and nitrogen outside the bladder before injection. The mixing chamber prepares a homogeneous mixture in advance, preventing stratification during the curing process and ensuring uniform temperature distribution from the start.
2Stability of the object's composition
If steam is injected first followed by nitrogen with agitation, then mixing can be achieved, but the process becomes complex and less productive
Solution Approach 1:
The patent segments the injection process into two independent parts: a mixing chamber for preparing the homogeneous mixture and a separate injection system for delivering it to the bladder. This segmentation simplifies the overall system by dedicating specific functions to specific components.
Solution Approach 2:
The mixing chamber acts as an intermediary device between the steam/nitrogen sources and the bladder. It serves as a intermediate stage where gases are properly mixed before being introduced to the curing chamber, eliminating the need for complex agitation mechanisms inside the bladder.
3Ease of operation
If nitrogen is injected in oblique direction towards upper part and steam horizontally, then injection can occur, but gases stratify due to density difference
Solution Approach 1:
The patent changes the key parameter of mixing location from inside the bladder to an external mixing chamber. By altering where the mixing occurs, the system avoids the problem of density-based stratification that happens when gases are injected directly into the bladder with simple directional injection.
4Duration of action of moving object
If high temperature and pressure are maintained in the bladder, then curing can proceed, but overcuring occurs due to excessive temperature
Solution Approach 1:
The patent ensures homogeneity of the heat-transfer fluid by thoroughly mixing steam and nitrogen before injection. This homogeneous mixture distributes heat uniformly throughout the curing chamber, preventing localized overheating and overcuring while maintaining the necessary temperature for proper curing duration.
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 achieves uniform temperature and pressure distribution within the tire, ensuring consistent curing quality and extending the life of the bladder by maintaining a homogenous heat-transfer fluid mixture, thus preventing overcuring and improving productivity.
Implementation Method 1
A vulcanizing device with a Venturi-effect injector that mixes steam and pressurized gas outside the curing chamber before introduction
Implementation Method 2
The heat-transfer fluid is introduced at a very high temperature and a very high pressure into the flexible bladder so as to press it firmly against the green tire and exchange heat energy therewith
Data Source
AI summary
A vulcanizing device for a tire includes a mold, a central part, a curing bladder, and an injector. The central part is positioned inside the mold and supports the curing bladder, which is arranged to press firmly against an internal part of a tire. An internal part of the curing bladder defines a vulcanizing chamber, which holds a pressurized heat-transfer fluid. The heat-transfer fluid, which is a mixture of steam and pressurized gas, circulates in the vulcanizing chamber and between an inlet pipe leading into the vulcanizing chamber and an outlet pipe leading out of the vulcanizing chamber. The injector is arranged outside the vulcanizing chamber and is connected to the inlet pipe, the outlet pipe, and a supply pipe for supplying steam or pressurized gas. The injector is structured to mix steam or pressurized gas coming from the supply pipe with the heat-transfer fluid leaving the vulcanizing chamber.