Compressor Piston Gas-Layer Structure for Heat Loss Reduction
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Solution Overview
Problem
In linear compressors, high temperature and high pressure gases cause heat transfer to the cylinder and piston, leading to heat loss and reduced compression efficiency due to the thermal conductivity of the materials used.
Innovation Solution
A piston design incorporating a sliding portion, a head portion with a suction port, a press-fit cap, and elastic members forming a gas layer to reduce heat transfer by creating a low thermal conductivity barrier between the compression space and the cylinder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a piston made of thermally conductive material is used, then heat transfer from compression space to suction space is improved, but compression efficiency deteriorates due to heat loss
Solution Approach 1:
The patent introduces a gas layer as an intermediary substance between the compression space and the piston body. This gas layer acts as a thermal barrier that prevents direct heat transfer from the high-temperature compression space to the piston, thereby reducing heat loss and improving compression efficiency while still allowing some thermal management.
Solution Approach 2:
The patent changes the thermal conductivity parameter by introducing a gas-filled space instead of direct solid contact. The gas layer has low thermal conductivity compared to solid materials, effectively reducing heat transfer. This parameter change allows the piston to maintain structural integrity while minimizing unwanted heat transfer to the suction space.
2Device complexity
If the piston structure is simplified, then device complexity is reduced, but heat insulation performance deteriorates
Solution Approach 1:
The patent employs a thin gas layer as a flexible thermal barrier between the compression space and the piston body. This gas layer acts as a thin film insulation that prevents heat transfer without requiring complex rigid insulation structures, thus maintaining simplicity while improving thermal performance.
3Loss of energy
If thermal insulation is enhanced, then compression efficiency is improved, but device complexity increases
Solution Approach 1:
The gas layer serves as a simple intermediary that provides thermal insulation without requiring complex multi-layer insulation structures. By introducing this single gas-filled space, the patent achieves effective heat loss prevention while maintaining relatively simple piston construction.
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 gas layer effectively prevents heat transfer from high temperature gases to the cylinder and piston, enhancing compression efficiency by minimizing heat loss.
Implementation Method 1
a gas layer is formed between the head portion, the press-fit cap, and the first elastic member... High temperature and high pressure gas compressed in the compression space acts as a heat source and generates heat transfer to a cylinder, the piston 1010, and the sucked refrigerant that have a relatively low temperature, leading to a heat loss
Data Source
AI summary
A piston for a compressor is disclosed. The piston for the compressor compressing and discharging a refrigerant sucked into a cylinder includes a sliding portion disposed in the cylinder and having a suction space to receive the sucked refrigerant, a head portion coupled to the sliding portion, a compression space being formed at a front of the head portion and the suction space being formed at a rear of the head portion, the head portion comprising a suction port communicating the suction space with the compression space, a press-fit cap coupled to the front of the head portion, the press-fit cap comprising a suction hole connected to the suction port, and a first elastic member disposed between the press-fit cap and the head portion. A gas layer is formed between the head portion, the press-fit cap, and the first elastic member.