Thermal Insulation System for Refrigeration Compressor Discharge
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Solution Overview
Problem
Existing refrigeration compressors face inefficiencies due to overheating caused by thermal exchange between the gas being drawn through the evaporation line and the compressor interior, leading to reduced capacity and efficiency, as prior solutions fail to effectively insulate the discharge heat from being transferred to the compressor's metallic parts.
Innovation Solution
A thermal insulation system for the discharge of a refrigeration compressor, featuring a hollow body with a plenum mounted inside the cylinder cap, maintaining a gap between the hollow body and the cylinder cap, and formed of thermal insulating material to prevent direct contact and further insulate the gas from the compressor's metallic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a discharge tube with plastic coating is used to insulate the discharge line, then heat transmission to the compressor interior is reduced, but the discharge gas heat is still transferred to the cylinder cap and metallic parts through the discharge chamber
Solution Approach 1:
The patent introduces a thermal insulating element as an intermediary substance filling the discharge chamber, positioned between the discharge tube and the cylinder cap. This mediator prevents direct thermal contact and blocks heat transfer pathways from the hot discharge gas to the cylinder cap and metallic components, thereby resolving the contradiction between maintaining discharge temperature and preventing energy loss to the compressor structure
Solution Approach 2:
The thermal insulating element is nested within the discharge chamber space, creating a layered insulation structure where the plastic-coated discharge tube is further enclosed by the insulating material in the discharge chamber. This nested arrangement provides multiple thermal barriers, effectively reducing heat transmission to the cylinder cap while maintaining the discharge function
2Temperature
If the discharge chamber is lined with thermal insulation directly against the cylinder cap, then insulation is provided, but thermal exchange through conduction still occurs between the gas and metallic parts
Solution Approach 1:
The patent employs a thermal insulating element as a mediator substance that fills the discharge chamber and contacts both the discharge tube and the cylinder cap. This intermediary material with low thermal conductivity breaks the direct thermal conduction pathway between the hot discharge gas and the metallic cylinder cap, preventing harmful heat transfer while maintaining structural integrity
Solution Approach 2:
The solution utilizes composite thermal insulation comprising both the plastic coating on the discharge tube and the thermal insulating element filling the discharge chamber. This multi-material approach creates a composite insulation system that addresses thermal conduction through different material properties, effectively blocking heat transfer to metallic parts
3Device complexity
If the discharge chamber allows direct contact between compressed gas and cylinder cap, then simple structure is maintained, but undesired heating of the gas to be compressed occurs
Solution Approach 1:
The thermal insulating element acts as a mediator that fills the discharge chamber and creates thermal separation between the hot discharge gas and the cylinder cap. This intermediary substance prevents direct thermal contact, blocking the heat transfer pathway that would otherwise warm the compression chamber and the gas to be compressed, while maintaining a relatively simple overall structure
Solution Approach 2:
The patent applies thermal insulation locally in the discharge chamber region where heat transfer from the discharge tube to the cylinder cap occurs. By concentrating the insulating element in this specific area, the solution prevents undesired heating of the compression chamber without requiring complex insulation throughout the entire compressor structure
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
Substantially reduces heat transfer to the cylinder cap and the compressor's internal environment, enhancing the compressor's efficiency by maintaining the refrigerant fluid at a lower temperature and minimizing undesired heating during the compression process.
Implementation Method 1
a thermal insulation system for the discharge of a refrigeration compressor... formed of thermal insulating material to prevent direct contact and further insulate the gas from the compressor's metallic components
Data Source
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AI summary
The compressor comprises: a cylinder crankcase (1) defining a cylinder (2) closed by a valve plate (3) provided with at least one discharge orifice (3a); a cylinder cap (10) seated against the valve plate (3) and in the interior of which is defined a discharge chamber (11). The present system comprises a hollow body (20) defining at least one plenum (21) mounted internal to the cylinder cap (10), maintaining a gap (30) with the latter. The hollow body (20) is seated against the valve plate (3), preventing the direct contact thereof with the inner volume of the hollow body (20), the latter being provided with an inlet nozzle (22) communicating the plenum (21) with the discharge orifice (3a) of the valve plate (3), and with an outlet nozzle (23) communicating the plenum (21) with a gas outlet (13) of the cylinder cap (10).