Insulated Partition Assembly for Scroll Compressor Heat Management
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Solution Overview
Problem
In scroll compressors, heat transfer from high-pressure discharge gas to low-pressure suction gas reduces refrigerant density and compressor efficiency, leading to increased power consumption and decreased cooling capacity.
Innovation Solution
A high-strength thermally insulative partition assembly is introduced, comprising a metal plate with an insulating region of low thermal conductivity, such as polytetrafluoroethylene (PTFE) or nylon-66, sandwiched between metal plates or coated on their surfaces, to minimize heat transfer between the high-pressure and low-pressure sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal partition plate is used to separate high-pressure and low-pressure sides, then structural strength and pressure resistance are improved, but heat transfer from high-pressure side to low-pressure side increases, reducing compressor efficiency
Solution Approach 1:
The partition plate is constructed as a composite structure with a metal core providing mechanical strength and thermal insulation layers (such as polymer materials or vacuum layers) attached to both surfaces. This composite design enables the partition to simultaneously withstand high pressure differentials while minimizing heat conduction from the high-pressure discharge side to the low-pressure suction side, thereby resolving the contradiction between structural strength and thermal insulation.
Solution Approach 2:
Thermal insulation materials are introduced as intermediary layers between the metal partition plate surfaces and the refrigerant chambers. These intermediary layers (such as foam insulation, polymer coatings, or vacuum spaces) act as thermal barriers that reduce heat transfer while allowing the metal plate to maintain its structural integrity and pressure-containing function.
2Loss of energy
If thermal insulation is added to the partition plate, then heat transfer reduction is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The thermal insulation layers are permanently bonded to both surfaces of the metal partition plate to form an integrated assembly. This merging of the metal plate and insulation layers into a single pre-assembled unit simplifies installation and reduces the number of separate components that need to be handled during manufacturing and assembly, thereby reducing device complexity despite adding insulation functionality.
Solution Approach 2:
The partition plate design utilizes insulation materials and structures with optimized thermal conductivity parameters and thicknesses to achieve the required heat transfer reduction. By carefully selecting and tuning these parameters, the design achieves effective thermal insulation without requiring excessively thick or complex insulation structures, thus balancing performance with manufacturing simplicity.
3Loss of energy
If partition plate thickness is increased to reduce heat transfer, then thermal insulation is improved, but weight and manufacturing cost increase
Solution Approach 1:
The use of composite materials with low thermal conductivity (such as polymer insulation layers or vacuum insulation) enables achieving the required thermal insulation performance with much thinner layers compared to using solid metal of equivalent insulation capability. This significantly reduces the weight of the partition assembly while maintaining effective heat transfer reduction.
Solution Approach 2:
Lightweight thermal insulation materials are introduced as intermediary layers that provide high thermal resistance per unit thickness. These materials (such as foam insulators or aerogel coatings) enable effective heat blockage with minimal added weight, allowing the partition to achieve thermal insulation goals without increasing overall mass significantly.
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 effectively reduces heat transfer by up to 59%, enhancing compressor efficiency, increasing capacity by 2-9%, and decreasing power consumption by 3-5%, while maintaining structural integrity under high pressure and temperature conditions.
Implementation Method 1
an insulating region having a thermal conductivity (K) of less than or equal to about 300 mW/m·K at standard temperature and pressure conditions
Data Source
AI summary
The present disclosure provides a high-strength thermally insulative partition assembly (e.g., muffler plate) for use in a scroll compressor. The assembly includes at least one metal plate and an insulating region. The insulating region may have at least one insulating material or may be a low-pressure or vacuum chamber. The partition assembly serves to minimize heat transfer between a low-pressure refrigerant on the low-pressure, suction side and a high-pressure, high-temperature refrigerant on the high-pressure, discharge side of the compressor. The insulating region may be sandwiched between multiple metal plates. The insulating region may be coated on the metal plate. The insulating region may also be a preformed component or mask that is coupled to the metal plate via a mechanical interlock system.