Device and method for measuring deep hypothermia heat leakage rate of material

Abstract

The invention discloses a device and a method for measuring the deep hypothermia heat leakage rate of a material. The device comprises an inner cylinder, an outer cylinder, an inner flange, an outer flange and heat insulation foam. The open end of the inner cylinder is welded to the inner flange, the side face and the bottom face are covered with heat insulation foam, a liquid inlet pipe and an air outlet pipe are welded to the bottom face, a low-temperature valve is arranged on the liquid inlet pipe, and a low-temperature valve, a pressure gauge and a flow meter are connected to the air outlet pipe. The outer cylinder and the inner cylinder are concentrically arranged, the open end is connected to the inner flange through a flange, a liquid inlet pipe is welded to the bottom face, meanwhile, an air outlet is formed, and the side face and the bottom face are covered with heat insulation foam. Threaded holes are formed in the outer edge of the inner flange in the circumferential direction. The outer side surface of the outer flange is provided with a small part made of a test material, the remaining area is covered with heat insulation foam, and the inner side is fastened on the inner flange through peripheral bolt and nut assemblies. The inner cylinder and the outer cylinder are axially and vertically arranged, and the flange is below. The outer cylinder, the inner flange and the outer flange are connected through the same set of bolt and nut assembly. A polytetrafluoroethylene gasket is arranged between the outer cylinder and the inner flange. The high-precision measurement method for the deep hypothermia heat leakage rate of the material is realized.

Description

technical field [0001] The invention belongs to the technical field of experimental detection devices, and relates to a phase change evaporation rate measurement device for low temperature fluid caused by environmental heat leakage, in particular to a material deep and low temperature heat leakage rate measurement device and method. Background technique [0002] Large-scale air separation systems, large-scale rockets using liquid hydrogen and liquid oxygen as propellants, and large-scale superconducting magnets all work in a deep and low-temperature environment, generally involving low-temperature fluids such as liquid nitrogen, liquid oxygen, liquid hydrogen, and liquid helium. Due to the huge temperature difference with the environment, in order to reduce the evaporation of cryogenic fluid, generally cryogenic fluid equipment works in a vacuum or is insulated with a material with a very small thermal conductivity. For example, the superconducting magnet system is generally...

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Problems solved by technology

These methods can only measure the overall evaporation rate of the cryogen...

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