High vacuum multiple layer heat insulation quilt manufacture method

Abstract

The invention provides a method for making a microvacuum multilayer heat-insulating quilt, belonging to cryogenic engineering and cryogenic technical field. The method comprises the following steps of: preparing a mechanized production line; a plurality of reflecting layers and heat insulating layers is sewed into a quilt by seams after the plurality of reflecting layers and heat insulating layers are alternately combined on the production line according to certain requirements; and the quilt is evenly penetrated to make holes. The microvacuum multilayer heat-insulating quilt made by using the method reduces workloads for winding heat-insulating materials, shortens binding period, guarantees that the heat insulation quilt can not loose during using, and even can improve vacuumizing efficiency and maintain high vacuum degree between interlayer on the premise of a guarantee of excellent and stable heat insulation performance, thereby the method has more advantages of lot manufacturing and producing of cryogenic storage and transportation equipment, and prominent economic benefit and social benefit in cryogenic engineering.

Description

technical field [0001] The invention relates to a manufacturing method of a high-vacuum heat-insulating structure for low-temperature storage and transportation equipment, in particular to a manufacturing method of a high-vacuum multi-layer heat-insulating quilt. It belongs to the field of cryogenic engineering and cryogenic technology. Background technique [0002] High-vacuum multi-layer insulation is a commonly used high-efficiency insulation method in low-temperature storage and transportation equipment. Its structural principle is that highly reflective metal films and good heat-insulating spacers are placed alternately in the vacuum jacket, usually dozens of reflective layers and The combination of the spacer layer, and then the air in the vacuum jacket is pumped out with a vacuum pump to make it reach a high vacuum state. The vacuum jacket and the multi-layer insulation materials in it form a complete multi-layer insulation structure, which can limit the heat transfe...

AI Technical Summary

Problems solved by technology

After a long time of vacuuming, although the vacuum degree of the interlayer meets the requirements, a large amount of gas released by the thermal insulation material accumulates between the material layers, and the gas between the layers cannot be effectively pumped out. The existence of the interlayer gas makes the convective heat transfer intensified. , deterioration of thermal insulation performance

[0005] In the prior art, the application number is 200620048082.8 utility model patent for the thermal insulation structure of cryogenic liquid container. Although the high-vacuum multi-layer thermal insulation material composite unit also includes 5 to 10 alternately stacked spacer layers and reflective layers, the preparation of the composite unit Most of them are overlapped by hand or simple machinery, and they are not fixed or stitched into a quilt. Therefore, the density of the combined unit layer and the misalignment of the edge size of the material are not consistent. When covering the outside of the tank, there is a phenomenon of loosening and falling off, resulting in insufficient stability of the thermal insulation structure.

At the same time, the patent does not mention the requirement of perforating the insulation material to accelerate interlayer degassing

The multi-layer thermal insulation structure produced by the existing technology does not mention the hole treatment on the material. In engineering applications, there are also a few processes that use manual methods to punch irregular holes in the thermal insulation structure. Although this method can extract part of the interlayer gas, However, the reflective layer is destroyed, which increases the radiation heat transfer

Moreover, due to the irregularity of the opening, the degree of influence on the thermal insulation performance cannot be determined, which makes the thermal insulation performance fluctuate up and down, and the stability is poor

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