Detachable test device and test method for testing performance of frozen thermal insulation material under confining pressure

Abstract

The invention relates to a detachable testing device for testing the performance of a frozen thermal insulation material under confining pressure. The detachable testing device is composed of a sealing cover round hole, a screw, a fixing groove, a first sealing groove, an oil valve, an outlet bolt, a pressure gauge, a screw hole, an external sleeve, a second sealing groove, a freezing pipe sealing disc, an external steel pipe, a nut, a sealing cover, a freezing pipe, a thermal insulation material, a temperature measuring line, a temperature measuring instrument, a refrigerating unit and a rubber pipe. The invention further provides a detachable test method for testing the performance of the frozen thermal insulation material under the confining pressure, and specific embodiments are provided. The device disclosed by the invention can be used for carrying out a material thermal insulation performance test under the action of crustal stress; the thermal insulation performance indexes of different materials under the action of different confining pressures can be simulated; more importantly, due to the fact that the device is detachable, the influence that sealing performance of the device becomes poor due to repeated cutting and welding is eliminated, increase of labor cost is avoided, fire hazards are eradicated, and a selection basis is provided for selecting materials with excellent heat preservation and cold insulation performance during underground freezing method construction.

Description

Technical field [0001] The present invention relates to the field of material insulation performance testing technology, and is specifically a peripheral freezing insulation material performance test detachable test device and test method. Background technique [0002] With the exhaustion of shallow coal resources, new mines are mostly dark coal seams. When the geological conditions are very complex, the soil layer is used, and when the frozen method is used to cut the well, a large amount of cold in the frozen tube is absorbed by the surrounding soil in the initial surface. Cause cold loss, thereby affecting construction progress and increasing construction costs. Therefore, it is necessary to select a material that is excellent in insulation performance for the initial surface segregation of frozen tube insulation. However, the insulation material on the frozen tube of the initial surface sectors will be subject to the ground stress of the soil layer, and the internal structure...

AI Technical Summary

Problems solved by technology

However, repeated welding and cutting not only affect the progress of the test, but also greatly increase the cost of the test; at the same time, repeated cutting and welding will also make the sealing performance of the one-piece closed sleeve worse and worse, which will lead to the failure of the confining pressure to be applied, resulting in the failure of the test ; more importantly, the high temperature and sparks generated during the cutting and welding process are very likely to ignite the material, causing the test to fail, causing a fire, and seriously threatening the life of the test personnel. Therefore, it is very necessary to design the performance of the freezing insulation material under confining pressure. Testing Detachable Test Devices

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