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Gradient thermal insulating layer and preparation method and preparation device thereof

A technology for preparing devices and thermal insulation layers, applied in lamination devices, heat exchange equipment, transportation and packaging, etc., can solve problems such as unevenness, and difficulty in sticking materials and inner walls tightly, and achieves the effect of meeting processing accuracy and suiting requirements.

Active Publication Date: 2017-09-15
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the flanges on both sides of the cylindrical workpiece are processed after welding, and the grooves on the inner wall surface that need to be covered with heat-insulating materials are uneven. How to ensure that the material adheres tightly to the inner wall is also a problem.

Method used

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  • Gradient thermal insulating layer and preparation method and preparation device thereof

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preparation example Construction

[0036] The invention provides a preparation method of a gradient heat insulation layer.

[0037] A method for preparing a gradient heat insulation layer provided by the present invention includes step 1: cutting two or more sheets of heat insulation material according to the size of the inner surface of the workpiece to be insulated; step 2: coating the inner surface of the workpiece The first adhesive is to paste the cut heat insulation materials on the inner surface of the workpiece in turn, and use the adhesive to bond the two adjacent heat insulation materials; Step 3: After the pasting is completed, apply The surface is sprayed with two or more impregnation solutions of different concentrations, and the concentrations are mass concentrations; after drying, the gradient heat insulation layer is obtained, and the heat insulation material is a flexible porous heat insulation material. The immersion liquid is a liquid with hardening properties after drying, and the spraying s...

Embodiment

[0071] This embodiment provides a method for preparing the gradient heat insulation layer by using the gradient heat insulation layer preparation device provided by the present invention. The device provided by this embodiment is as figure 1 shown.

[0072] The gradient heat insulation layer for a cylindrical workpiece and its coating method and device provided in this embodiment can be applied to large-sized cylindrical workpieces. The length of the workpiece is 1.9 meters, the diameter is 0.5 meters, the cylinder of the workpiece is welded, and the designed depth of the groove covering the heat insulation material is 7mm. There are actually uneven phenomena, the maximum height difference is 1.2mm, and the maximum coating size is 7.8mm. A specific embodiment is to bond multiple layers of insulating material within the workpiece and then perform gradient hardening.

[0073] Among them, according to the working temperature of the workpiece, alumina fiber paper and aluminum si...

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Abstract

The invention relates to a gradient thermal insulating layer and a preparation method and a preparation device thereof. The preparation method comprises the following steps: cutting two or more pieces of a heat insulating material according to the size of the internal surface of a to-be-heat-insulated workpiece; smearing an adhesive to the internal surface of the workpiece, bonding the cut heat insulating material on the internal surface of the workpiece in sequence, and bonding two adjacent layers of the heat insulating material; spraying steeping liquid of two or more different concentrations on the surface of the heat insulating material; and drying to obtain the gradient thermal insulating layer, wherein the heat insulating material is flexible porous heat insulating material, the steeping liquid has hardening characteristic after drying, and the spraying sequence for the steeping liquid of different concentrations is from high concentration to low concentration. The invention also provides a device for preparing the gradient thermal insulating layer. The gradient thermal insulating layer has gradually changed hardness gradient, which is more suitable for practical applications.

Description

technical field [0001] The invention relates to the technical field of heat protection, in particular to a gradient heat insulation layer and a preparation method and device thereof. Background technique [0002] When the high-speed flight engine is working, the temperature of the wall surface of the combustion chamber is as high as 3000K. In order to protect the metal workpiece outside the engine and its peripheral electronic equipment, it is necessary to coat the outer wall of the combustion chamber and the inner wall of the workpiece with high-temperature-resistant heat-insulating materials for thermal protection. After heating the material, the cylindrical combustion chamber and the cylindrical workpiece are set. [0003] In order to reduce gas convection heat transfer, the gap between the combustion chamber and the cylindrical workpiece is usually less than 0.5mm. The length of the cylindrical workpiece is 1.5 to 2 meters, so a very high precision requirement is put fo...

Claims

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Application Information

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IPC IPC(8): B32B3/24B32B5/26B32B7/12B32B37/06B32B37/12B32B38/08F16L59/02
CPCB32B3/266B32B5/26B32B7/12B32B37/06B32B37/12B32B38/08B32B2250/02B32B2255/02B32B2260/04B32B2260/046B32B2307/304B32B2605/18F16L59/029
Inventor 张世超陈玉峰孙浩然陈曙光邓可为闫达琛方凯李世新李佳绪王卓
Owner CHINA BUILDING MATERIALS ACAD
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