Preparation method of body or door of refrigerator

A box and box door technology, which is applied in the field of refrigerator box or box door preparation, can solve the problems that the heat insulation effect of the polyurethane insulation layer is greatly affected, and the polyurethane is difficult to distribute evenly, so as to avoid the effect of resistance

Active Publication Date: 2015-01-21
ZHEJIANG RIPU ELECTRONICS SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of refrigerator production and processing, the faster the polyurethane foaming speed, the finer the cells, the lower the thermal conductivity of the polyurethane insulation layer, that is, the better the heat insulation effect of the polyurethane insulation layer; however, in the actual production and processing process , due to the growth and expansion of microbubbles generated during polyurethane foaming will have a certain resistance to the fluid, it is difficult to distribute polyurethane evenly and has a great impact on the heat insulation effect of the polyurethane insulation layer

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1, a method for preparing a cabinet or door of a refrigerator, comprising the following process steps, specifically:

[0017] a. Place the assembled box shell or box door shell in a closed space;

[0018] b. The dry air at 80-100°C is circulated into the above-mentioned confined space through the circulating fan, and the time for entering the dry air is 20-30s;

[0019] c. After the time for the dry air to pass through, the above-mentioned circulation fan is stopped immediately, the vacuum pump is started immediately and the above-mentioned closed space is vacuumed, and the air pressure value in the above-mentioned closed space reaches -1.2~-0.1Mpa after 3~5s;

[0020] d. Keep the air pressure value in the above-mentioned confined space within the range of -1.2~-0.1Mpa, and the foaming material mixed at high speed by the mixing head of the polyurethane foaming machine is quickly injected into the box shell or the box door shell, wherein, Foaming material...

Embodiment 2

[0025] Embodiment 2, a method for preparing a cabinet or door of a refrigerator, comprising the following process steps, specifically:

[0026] a. Place the assembled box shell or box door shell in a closed space;

[0027] b. The dry air at 80-100°C is circulated into the above-mentioned confined space through the circulating fan, and the time for entering the dry air is 20-30s;

[0028] c. After the time for the dry air to pass through, the above-mentioned circulation fan is stopped immediately, the vacuum pump is started immediately and the above-mentioned closed space is vacuumed, and the air pressure value in the above-mentioned closed space reaches -1.2~-0.1Mpa after 3~5s;

[0029] d. Keep the air pressure value in the above-mentioned confined space within the range of -1.2~-0.1Mpa, and the foaming material mixed at high speed by the mixing head of the polyurethane foaming machine is quickly injected into the box shell or the box door shell, wherein, Foaming materials in...

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PUM

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Abstract

The invention discloses a preparation method of a body or a door of a refrigerator. The method finishes the preparation of the body or the door of the refrigerator through such process steps as preheating, vacuumizing, pressure maintaining injection, pressure maintaining foaming and air cooling; and because of the effect of negative pressure, when polyether glycol, polyester glycol, cyclopentane and isocyanate are mixed to be injected in a body shell or a door shell, microbubbles generated in the foaming can be timely and quickly discharged, so that the resistance effect generated by the growing expansion of the microbubbles is prevented, the polyurethane foaming speed is quickened, and the insulating performance of the refrigerator is improved.

Description

technical field [0001] The invention relates to the technical field of refrigerators, in particular to a method for preparing a refrigerator box or box door. Background technique [0002] As a general household appliance, a refrigerator has been widely used in people's daily life, wherein the refrigerator includes a cabinet, a cabinet door and a corresponding refrigeration system. For the box body and the box door, in order to ensure a good heat insulation effect, the inside of the box shell and the box door shell are filled with polyurethane heat insulation layer. [0003] In the process of refrigerator production and processing, the faster the polyurethane foaming speed, the finer the cells, the lower the thermal conductivity of the polyurethane insulation layer, that is, the better the heat insulation effect of the polyurethane insulation layer; however, in the actual production and processing process , because the growth and expansion of the microbubbles generated durin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/18B29C44/42
Inventor 王焕江李伟岑君妮
Owner ZHEJIANG RIPU ELECTRONICS SCI & TECH
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