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CN-121994828-A - Dynamic vacuum insulation nondestructive testing tool

CN121994828ACN 121994828 ACN121994828 ACN 121994828ACN-121994828-A

Abstract

The invention provides a dynamic vacuum insulation nondestructive testing tool which comprises a low atomic number shell, an inner side of the shell is provided with an elastic temperature resistant layer, a magnetic attraction fixing unit is embedded in the shell, an inner supporting structure is arranged in the shell of a carbon fiber shell and is composed of at least two layers of V-shaped corrugated sheets which are arranged in an orthogonal mode and nano porous insulation composite materials filled in gaps of the corrugated sheets, a dynamic vacuum system comprises a sealing valve and a vacuum pump, a multi-point pumping port, a vacuum monitoring unit and a controller, the working state of the vacuum pump is automatically adjusted according to vacuum degree change, dynamic vacuum on-demand control is adopted, rapid vacuumizing and pressure relief are realized by cooperation of the magnetic attraction sealing valve and the vacuum pump, energy consumption is reduced, radiation interference is reduced, meanwhile, the surface of an insulation board is ensured to be maintained within a certain range by cooperation effect formed by combining the vacuum layer with aerogel ceramic composite materials, and meanwhile, the orthogonal corrugated sheets and point contact needle-shaped supports disperse stress are enhanced in structural strength.

Inventors

  • WANG YUE
  • ZHANG LIANG

Assignees

  • 上海理工大学

Dates

Publication Date
20260508
Application Date
20251209

Claims (10)

  1. 1. A dynamic vacuum insulation nondestructive testing tool is characterized by comprising: the inner side of the shell with low atomic number is provided with an elastic temperature resistant layer, and a magnetic fixing unit is embedded in the shell; The inner support structure is arranged in the shell of the carbon fiber shell and consists of at least two layers of V-shaped corrugated sheets which are arranged in an orthogonal manner and nano porous heat insulation composite materials filled in gaps of the corrugated sheets; the dynamic vacuum system comprises a sealing valve and a vacuum pump, and is provided with a multi-point air extraction opening, a vacuum monitoring unit and a controller, and the working state of the vacuum pump is automatically adjusted according to the change of the vacuum degree; The surface of the V-shaped corrugated sheets is provided with a high-temperature-resistant coating, point contact type supporting units are arranged between the V-shaped corrugated sheets, and the controller adjusts the air extraction rate in real time according to the vacuum degree.
  2. 2. The dynamic vacuum insulation nondestructive testing tool according to claim 1, wherein the low atomic number shell is made of carbon fiber reinforced polymer-based materials, and the magnetic fixing unit is a neodymium-iron-boron magnet.
  3. 3. The dynamic vacuum insulation nondestructive testing tool according to claim 1, wherein the nano porous insulation composite material is an aerogel reinforced ceramic fiber composite material, the compressive strength is more than or equal to 50MPa, and the temperature resistance is more than or equal to 1300 ℃.
  4. 4. The dynamic vacuum insulation nondestructive testing tool according to claim 1 is characterized in that a high-temperature resistant coating on the surface of the V-shaped corrugated sheet is CrNbO 4 coating, the temperature resistance is more than or equal to 300 ℃, and the wave height of the V-shaped corrugated sheet is 10mm and the wave distance is 15mm.
  5. 5. The dynamic vacuum insulation nondestructive testing tool according to claim 1, wherein the point contact type supporting unit is of a spherical needle-shaped supporting structure, is connected with the corrugated sheet through high-temperature sintering, and has a point contact area of less than or equal to 0.5%.
  6. 6. The dynamic vacuum insulation nondestructive testing tool according to claim 1, wherein the pumping time of the dynamic vacuum system is less than or equal to 10 minutes, and the vacuum degree is maintained to be less than or equal to 10 -6 Pa.
  7. 7. The dynamic vacuum insulation nondestructive testing tool according to claim 1, wherein the total absorption of the testing tool to Ir-192 gamma rays is less than or equal to 12%.
  8. 8. The dynamic vacuum insulation nondestructive testing tool according to claim 1, wherein a sealing surface of the magnetic sealing valve is coated with CrNbO 4 layers, and the temperature resistance is more than or equal to 300 ℃.
  9. 9. The dynamic vacuum insulation nondestructive testing tool according to claim 1, wherein the elastic temperature-resistant layer is a silica gel layer with precut V-shaped grooves, and the groove depth is adapted to the minimum bending radius of the pipeline.
  10. 10. The dynamic vacuum insulation nondestructive testing tool according to claim 1 is characterized in that the vacuum monitoring unit is a film vacuum gauge, the film vacuum gauge is integrated into the dynamic vacuum system, the air extraction rate is adjusted in real time through a controller, and the working state of a pump is automatically adjusted according to the change of the vacuum degree.

Description

Dynamic vacuum insulation nondestructive testing tool Technical Field The invention relates to the technical field of nondestructive testing of thermal pipelines, in particular to a dynamic vacuum insulation nondestructive testing tool. Background When the heating power pipeline is used for detecting the online film rays, the heat insulation layer at the detection part needs to be removed, but the high-temperature pipe wall can cause the problems of film performance damage, substrate deformation, failure of a sensitization screen and the like. Most of the existing heat insulation devices are made of materials with low heat conductivity coefficients, are insufficient in structural strength and large in ray interference, and cannot be directly used for detection areas. Therefore, there is a need for an adiabatic apparatus with dynamic vacuum control, low radiation interference and high structural strength to improve the accuracy and safety of high temperature pipeline detection. Disclosure of Invention The invention aims to provide an adiabatic device with dynamic vacuum control, low ray interference and high structural strength, and solves the problems that the traditional adiabatic device is difficult in vacuum maintenance, remarkable in high-temperature deformation, high in ray absorption and scattering rate and the like. In order to achieve the above purpose, the invention provides a dynamic vacuum insulation nondestructive testing tool, comprising: The low atomic number shell is provided with an elastic temperature resistant layer at the inner side and a magnetic attraction fixing unit embedded in the shell, and the problems of ray absorption and scattering are remarkably reduced by adopting the carbon fiber low atomic number shell; The inner support structure is arranged in the shell of the carbon fiber shell and consists of at least two layers of V-shaped corrugated sheets which are arranged in an orthogonal manner and nano porous heat insulation composite materials filled in gaps of the corrugated sheets; the dynamic vacuum system comprises a sealing valve and a vacuum pump, and is provided with a multi-point air extraction opening, a vacuum monitoring unit and a controller, and the working state of the vacuum pump is automatically adjusted according to the change of the vacuum degree; The surface of the V-shaped corrugated sheets is provided with a high-temperature-resistant coating, point contact type supporting units are arranged between the V-shaped corrugated sheets, the point contact units of the orthogonal corrugated sheets are matched, balance between high structural strength and low heat conduction is achieved, and the controller adjusts the air extraction rate in real time according to the vacuum degree. Further, the sealing valve is a magnetic type sealing valve, the vacuum pump is a portable vacuum pump, and the magnetic type sealing valve and the portable vacuum pump are cooperated to realize rapid vacuumizing and pressure relief, so that the energy consumption in high-temperature pipeline detection is greatly reduced. Furthermore, the shell with low atomic number is made of carbon fiber reinforced polymer base material, and the magnetic attraction fixing unit is a neodymium-iron-boron magnet. Further, the nano porous heat insulation composite material is an aerogel reinforced ceramic fiber composite material, the compressive strength is more than or equal to 50MPa, and the temperature resistance is more than or equal to 1300 ℃. Furthermore, the high-temperature resistant coating on the surface of the V-shaped corrugated sheet is CrNbO 4 coating, the temperature resistance is more than or equal to 300 ℃, and the wave height and the wave distance of the V-shaped corrugated sheet are 10mm and 15mm. Furthermore, the point contact type supporting unit is a bulbous needle-shaped supporting structure, the needle-shaped structure is of a circular section, the needle-shaped structure is connected with the corrugated sheet through high-temperature sintering, the point contact area ratio is less than or equal to 0.5%, and the heat conduction path is greatly reduced through the design of the minimized contact area, and meanwhile, the structural supporting strength is maintained. Further, the pumping time of the dynamic vacuum system is less than or equal to 10 minutes, and the vacuum degree is maintained to be less than or equal to 10 < -6 > Pa. Furthermore, the total absorption of the detection tool to Ir-192 gamma rays is less than or equal to 12%, the film is ensured to obtain enough exposure due to the low ray absorption characteristic, and the defect detection rate and the imaging quality are improved. Furthermore, the sealing surface of the magnetic sealing valve adopts CrNbO 4 coating, the temperature resistance is more than or equal to 300 ℃, and the CrNbO 4 coating has excellent high-temperature stability and sealing performance, and can maintain long-term effective vacuum sealing in a 300