Variable Dead Volume Compressor Thermal Management
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Solution Overview
Problem
Existing air compressors used in breakdown kits for inflating tires face thermal overload issues due to limited temperature resistance and thermal conductivity of plastic materials, leading to increased production costs or reduced performance when made of metal or oversized designs.
Innovation Solution
A reciprocating piston compressor with a variable dead air volume that adjusts based on cylinder head temperature, utilizing a pressure chamber connected to the compression chamber, actuated by a shape memory alloy or thermal bimetallic element, to control compressor performance and prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the compressor is made of plastic materials to reduce production costs, then manufacturing cost decreases, but temperature resistance and thermal conductivity worsen
Solution Approach 1:
The patent applies local quality by making only the cylinder head (the component most exposed to thermal stress) from metal, while the rest of the compressor body remains plastic. This targeted approach provides thermal resistance exactly where needed without requiring the entire compressor to be metal, thus balancing cost and temperature resistance.
2Reliability
If the compressor power is permanently limited to prevent thermal overload, then reliability improves, but productivity decreases
Solution Approach 1:
The patent implements dynamics by making the dead air volume variable rather than fixed. The dead air volume automatically adjusts based on operating conditions - increasing when thermal overload is detected to reduce compressor power and prevent damage, and decreasing when cooling is sufficient to restore full productivity. This dynamic adjustment resolves the contradiction between reliability and productivity.
3Temperature
If active cooling measures are implemented to prevent thermal overload, then temperature control improves, but device complexity increases
Solution Approach 1:
The patent applies self-service by designing a passive thermal management system where the variable dead air volume automatically responds to temperature conditions without requiring external control systems, sensors, or active cooling mechanisms. The system self-regulates compressor power based on its own thermal state, simplifying the overall device while maintaining effective temperature control.
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
This design allows for efficient, high-power operation with reduced thermal stress and lower production costs, as the dead air volume can be electronically controlled, reducing compressor output, temperature, and electrical power consumption by up to 30%, while maintaining efficiency and preventing uncontrolled system swings.
Implementation Method 1
actuated by a shape memory alloy or thermal bimetallic element
Implementation Method 2
actuated by a shape memory alloy or thermal bimetallic element
Implementation Method 3
compressor unit as the compressed gas source, which is designed as a reciprocating piston compressor
Implementation Method 4
the dead air volume can be electronically controlled, reducing compressor output, temperature, and electrical power consumption
Data Source
Figure 1A~1B
AI summary
The invention relates to a device for sealing and inflating inflatable objects, in particular for sealing and inflating motor vehicle tyres. Said device comprises a compressor unit as a pressurized gas source, which is designed as a reciprocating piston compressor (10) driven by means of a thrust crank gear. Said reciprocating piston compressor is provided with a variable dead volume of air (9), the content thereof can be varied depending on the temperature of the cylinder head (11).