Deformable Compressor Cylinder for Relief-Free Tire Repair Pressure Control
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Solution Overview
Problem
Existing compressor systems for puncture repair kits face challenges in efficiently limiting maximum pressure without using relief valves, particularly for high compression volumes, leading to high production costs and design restrictions.
Innovation Solution
A compressor system with an elastically deformable cylinder main body made of plastic, allowing pressure control without relief valves by deforming as pressure increases, adhering to the expression 0.3×V1×P0/(Pp-P0) < V2 < 0.8×V1×P0/(Pp-P0), where V1 is the swept volume, V2 is the compression volume at top dead center, and P0 is the air pressure, enabling flexible design and reduced production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal cylinder is used to ensure material stability for air compression, then the structural strength is improved, but the production cost increases and design flexibility is reduced
Solution Approach 1:
The invention changes the material parameter from rigid metal to elastically deformable plastic, allowing the cylinder to dynamically adjust its compression volume through elastic deformation under pressure. This enables the use of cheaper plastic materials while maintaining the required structural functionality through elastic rather than rigid strength.
Solution Approach 2:
The invention introduces dynamic behavior to the cylinder by allowing it to elastically deform under compression pressure. The compression volume becomes a dynamic parameter that increases with pressure according to the relationship V2/V1 ≥ 0.8, rather than remaining fixed as in traditional rigid metal cylinders. This dynamic adaptation eliminates the need for expensive metal materials.
2Reliability
If a relief valve is used to limit maximum pressure, then the pressure control safety is improved, but the device complexity increases
Solution Approach 1:
The invention makes the cylinder itself perform the pressure limitation function through its elastic deformability. As pressure increases, the cylinder wall elastically deforms to increase the compression volume, automatically limiting the maximum pressure without requiring an external relief valve. The system serves itself by using the cylinder's inherent elastic properties for pressure control.
Solution Approach 2:
The invention extracts and removes the relief valve from the system, replacing it with the intrinsic elastic deformability of the cylinder. The pressure limitation function that was previously performed by a separate relief valve component is now integrated into the cylinder structure itself, simplifying the overall device.
3Volume of moving object
If the compression volume is reduced to below 0.8 for portability, then the compactness is improved, but the ability to limit maximum pressure without relief valve is worsened
Solution Approach 1:
The invention changes the nature of the compression volume from a fixed geometric parameter to a dynamic parameter that varies with pressure. The ratio V2/V1 ≥ 0.8 represents the minimum elastic deformability required, allowing the actual compression volume to be small at low pressure (for portability) while automatically increasing under pressure to provide adequate pressure limitation capability.
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 system achieves consistent pressure control for high compression volumes, reducing production costs and minimizing the risk of return flow, while allowing for a variety of designs and safe operation without relief valves.
Implementation Method 1
the cylinder main body is elastically deformable as the pressure increases
Data Source
AI summary
A compressor system for a puncture repair kit, in which a supply pressure of compressed air is controlled to a specified pressure Pp or less without the use of a relief valve, having a motor, a piston, which is driven by the motor via a crank mechanism and has a cylinder component with a cylinder main body having a pump chamber, in which a piston is movable between a bottom dead center and a top dead center and air is compressed, and a receiving chamber for receiving the compressed air compressed in the pump chamber through an air discharge valve. The cylinder main body is elastically deformable as the pressure increases, the cylinder main body being deformable to such an extent that the compression volume V2 of the cylinder fulfills the following expression (a) 0.3×V1×P0/(PP−P0)=<V2<0.8×V1×P0/(PP−P0) (a), where V1 is a swept volume which is a cylinder volume while the piston moves from the bottom dead center to the top dead center, V2 is a compression volume which is a cylinder volume when the piston is located at the top dead center, and P0 is an air pressure.