Thermal insulation box and manufacturing method therefor, and refrigerator having same

Solution Overview

Problem

The existing methods for incorporating vacuum insulation panels in refrigerators result in skinning of the foaming material due to inadequate preheating, affecting the energy-saving effect and appearance, and there is a need for improved methods to ensure uniform foaming and enhanced insulation.

Innovation Solution

A method involving pre-assembling a shell with a vacuum insulation panel, using auxiliary workpieces to mitigate height differences, and heating the inside of the cabinet shell with hot air to achieve uniform foaming and improve insulation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the heat preservation layer is thinned to increase volume ratio, then the volume is improved, but the preheating temperature on the vacuum insulation panel side is insufficient causing skinning of foaming material

Engineering Contradiction:

Improvevolume ratioVSAvoidpreheating temperature

Core Design Contradiction:

Volume of moving objectVSTemperature

Solution Approach 1:

The patent applies preliminary action by pre-heating the cabinet body before foaming, specifically targeting the vacuum insulation panel area. The pre-heating temperature is raised to 80-100℃ to ensure sufficient thermal energy is available when foaming material contacts the panel, preventing skinning while maintaining thin heat preservation layer thickness.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the preheating temperature parameter from traditional lower temperatures to 80-100℃, and adjusts the preheating time to 5-15 minutes. These parameter modifications ensure the vacuum insulation panel reaches adequate temperature before foaming, solving the skinning problem while maintaining thin heat preservation layer design.

Inventive Principle:

Principle #35Parameter changes

2Volume of moving object

If the heat preservation layer is thinned, then the volume ratio is improved, but the foaming material skins on the surface of the vacuum insulation panel affecting energy-saving effect

Engineering Contradiction:

Improvevolume ratioVSAvoidfoaming uniformity

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by pre-heating the cabinet body before foaming, specifically targeting the vacuum insulation panel area. The pre-heating temperature is raised to 80-100℃ to ensure sufficient thermal energy is available when foaming material contacts the panel, preventing skinning while maintaining thin heat preservation layer thickness.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent changes the preheating temperature parameter from traditional lower temperatures to 80-100℃, and adjusts the preheating time to 5-15 minutes. These parameter modifications ensure the vacuum insulation panel reaches adequate temperature before foaming, solving the skinning problem while maintaining thin heat preservation layer design.

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If preheating time is extended to achieve sufficient temperature, then the foaming quality is improved, but the production efficiency decreases due to fast line rhythm

Engineering Contradiction:

Improvefoaming qualityVSAvoidproduction efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent changes the preheating temperature parameter from traditional lower temperatures to 80-100℃. This higher temperature allows the vacuum insulation panel to reach the required foaming temperature faster, reducing preheating time to 5-15 minutes while ensuring adequate thermal energy for uniform foaming, thus balancing quality with production efficiency.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent applies preliminary action by pre-heating the cabinet body before foaming, specifically targeting the vacuum insulation panel area. The pre-heating temperature is raised to 80-100℃ to ensure sufficient thermal energy is available when foaming material contacts the panel, preventing skinning while maintaining thin heat preservation layer thickness.

Inventive Principle:

Principle #10Preliminary action

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 method ensures the inner surface of the vacuum insulation panel reaches the required foaming temperature, reducing skinning and enhancing insulation performance while maintaining aesthetic appeal.

Implementation Method 1

injecting a foaming material between the cabinet shell and an inner liner for foaming

Methodology Applied

Scientific EffectFoaming: Foam

Implementation Method 2

heating an inside of the cabinet shell

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Data Source

PatentEP4129614B1Thermal insulation box and manufacturing method therefor, and refrigerator having same

Publication Date: 2025.07.16 QINDAO HAIER REFRIGERATOR CO LTD

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Figure 3

AI summary

A thermal insulation box and a manufacturing method therefor, and a refrigerator having same. The manufacturing method for the thermal insulation box comprises the following steps: pre-assembling a housing, having a vacuum insulation panel attached to the inside, into a box housing; heating the inside of the box housing; and injecting a foaming material between the box housing and an inner liner for foaming. According to the present invention, the inside of the box housing is heated, such that the inner surface of the housing can reach a target temperature required for foaming, thereby reducing or avoiding a surface crusting phenomenon, and improving a thermal insulation effect of the thermal insulation box.