Vacuum heat insulating panel and method for manufacturing same
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Solution Overview
Problem
Conventional vacuum heat-insulating panels suffer from a thermal bridge effect due to aluminum foil outer wrapping materials and poor heat insulation caused by randomly arranged glass fibers in the core material, leading to high heat conductivity and reduced heat preservation efficiency.
Innovation Solution
A method for manufacturing a vacuum heat-insulating panel involving a core material of uniformly laminated glass fibers with diameters between 1 µm to 3 µm, produced by pouring molten glass into a high-speed centrifugal head, and an outer wrapping material without aluminum foils to prevent thermal bridges, combined with a calcium oxide getter for improved vacuum integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If aluminum foil is used as outer wrapping material, then heat insulation is improved, but thermal bridge effect occurs causing heat transfer through the wrapping material
Solution Approach 1:
The patent removes the aluminum foil layer from the outer wrapping material structure. The specification explicitly states that the outer wrapping material comprises polyethylene terephthalate film without aluminum foil, thereby eliminating the thermal bridge effect caused by metallic layers while maintaining the heat insulation function through the plastic film structure.
Solution Approach 2:
The patent uses a composite structure consisting of multiple layers including polyethylene terephthalate film, foam plastic, and heat-insulating board. This composite material approach provides effective heat insulation without relying on aluminum foil, thus avoiding thermal bridge effects while maintaining or improving insulation performance.
2Ease of manufacture
If glass fibers are arranged in random order in core material, then manufacturing is simplified, but heat transfer occurs through erect fibers and voids reducing heat insulation
Solution Approach 1:
The patent specifies that glass fibers in the core material should be arranged perpendicular to the heat transfer direction. This local orientation arrangement optimizes the heat insulation performance by preventing heat conduction through fibers, while the specification acknowledges this requires specific manufacturing control rather than completely random arrangement.
Solution Approach 2:
The patent transforms the fiber arrangement from a two-dimensional random planar distribution to a three-dimensional structured orientation where fibers are perpendicular to the heat transfer direction. This dimensional change in fiber orientation effectively blocks heat transfer paths through the core material.
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 blocks heat transfer, reducing the heat conductivity coefficient to less than 0.002 W/m.K and enhancing heat preservation performance by over 5%, thereby improving energy efficiency in refrigeration systems.
Implementation Method 1
pouring molten glass at a high temperature of 1100 °C to 1300 °C into a centrifugal head spinning at a high speed, where the spinning speed of the centrifugal head is 2000 rpm to 2500 rpm, flinging out fiber filaments
Implementation Method 2
a getter (usually calcium oxide that absorbs water) placed inside
Implementation Method 3
A vacuum heat-insulating panel includes three parts: an inner core material (usually an assembly of glass fibers), an outer wrapping material, and a getter placed inside. A vacuum degree of the vacuum panel directly affects the heat preservation effect
Data Source
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Figure 5
AI summary
A vacuum heat-insulating panel comprises outer wrapping material and core material. A getter is provided in the core material. The outer wrapping material is made by compounding wrapped material without aluminum foil on one side or both sides. The core material is made of an aggregate of glass fiber with uniform laminated structure, and the diameter of the glass fiber is 1-3 µm. A method for manufacturing the vacuum heat-insulating panel is also disclosed. Due to very high vacuum degree in the vacuum heat-insulating panel, the heat transferring speed is reduced. And, because of the outer wrapping material without aluminum foil layer, the edge thermal bridge effect is eliminated and the heat insulation effect is very good.