Vacuum high temperature cleaning adsorption activation process for thermal insulation spacers

Abstract

The present invention relates to a vacuum high-temperature cleaning adsorption activation device for an insulating spacer and a process method thereof, which comprises a vacuum drying oven, the vacuum drying oven comprises an oven door, a sample rack is arranged in the vacuum drying oven, a spacer is arranged on the sample rack; a temperature measurement controller is arranged in the vacuum drying oven, the vacuum drying oven is connected to a first vacuum gauge, the vacuum drying oven is connected to a vent valve, one end of the vent valve is connected to a high-purity nitrogen interface, and the other end is connected to the vacuum drying oven, and the spacer is polyimide aerogel fiber paper or polyimide aerogel fiber cloth and glass fiber paper. The present invention utilizes the adsorption characteristics of the micropores of the polyimide aerogel fiber paper after displacement drying and activation at ultra-low temperature to adsorb residual gas molecules between the layers of the composite multi-layer insulation, thereby improving the vacuum degree between the layers and extending the high vacuum maintenance time between the layers.

Description

Technical Field

[0001] The invention relates to the technical field of low-temperature thermal insulation, and in particular to a vacuum high-temperature cleaning adsorption activation device for a thermal insulation spacer and a process method thereof. Background Art

[0002] The storage temperature of cryogenic liquids is very low, such as: liquid nitrogen (-196℃), liquid oxygen (-183℃), liquid argon (-186℃), liquefied natural gas (-162℃), liquid hydrogen (-253℃), and liquid helium (-269℃). These cryogenic liquids are generally stored in vacuum double-wall cryogenic containers. The middle of the double wall is evacuated and covered with multiple layers of insulation on the surface of the inner container. This is to block the heat from external heat entering the temperature liquid through radiation, conduction and convection. Although multi-layer insulation can effectively prevent the introduction of external heat, the characteristics of the multi-layer insulation layer materials in the vacuum interlayer and the release of gas on the surface of the interlayer wall in the vacuum environment will bring about heat transfer of free gas molecules. The cavity of multi-layer insulation can be evacuated to a high vacuum, but the gas molecules continuously analyzed by the interlayer material have an interlayer pressure that is dozens of times higher than that of the interlayer cavity, making it impossible to eliminate the heat conduction of free molecules of the interlayer gas. The lower the temperature of the cryogenic medium, the easier it is to volatilize. Any small heat flow entering the interior of the cryogenic liquid container will cause a large amount of evaporation of the cryogenic liquid. In order to reduce the evaporation loss of ultra-low temperature liquids such as liquid hydrogen and liquid helium during storage and transportation, it is necessary to increase the vacuum degree of the vacuum interlayer and extend the maintenance time of high vacuum in the vacuum interlayer, reduce the heat conduction of gas free molecules, and further improve the insulation performance of the multi-layer insulation.

[0003] The current problem is that due to the cleaning phenomenon of the insulation material in a vacuum environment, the number and concentration of free gas molecules between the multiple insulation layers continue to increase, and these free gas molecules continue to diffuse into the vacuum compartment outside the multiple insulation layers, continuously deteriorating the vacuum. The vacuum deterioration increases external heat conduction, which becomes the main problem of the rapid decline in the performance of the multi-layer insulated low-temperature container. Summary of the invention

[0004] The purpose of the present invention is to overcome the above-mentioned shortcomings and to provide a vacuum high-temperature cleaning adsorption activation device and a process method for an insulating spacer. After vacuum high-temperature cleaning, the insulating spacer can not only reduce the material degassing rate of the multi-layer insulating material in the vacuum interlayer, but also enable the material to produce an adsorption effect on various free gas molecules in a low-temperature environment, thereby increasing the vacuum degree of the vacuum interlayer of the low-temperature container and extending the time for maintaining the vacuum state of the vacuum interlayer. By reducing the thermal conductivity of the free gas molecules, the thermal insulation performance of the multi-layer insulation is improved.

[0005] The object of the present invention is achieved in that:

[0006] A vacuum high-temperature cleaning adsorption activation device for insulating spacers, comprising a vacuum drying oven, the vacuum drying oven comprising a door, a sample rack provided in the vacuum drying oven, and a spacer placed on the sample rack; a temperature measurement controller is provided in the vacuum drying oven, and the vacuum drying oven is connected to a first vacuum gauge for measuring the vacuum degree in the vacuum drying oven. The vacuum drying oven is connected to a vent valve, one end of the vent valve is connected to a high-purity nitrogen interface, and the other end is connected to the vacuum drying oven, and high-purity nitrogen is filled and discharged into the vacuum drying oven through the vent valve. The vacuum drying oven is connected to a vacuum unit and a second vacuum gauge through a first vacuum valve and a second vacuum valve.

[0007] Furthermore, the spacer is polyimide aerogel fiber paper or polyimide aerogel fiber cloth and glass fiber paper.

[0008] Furthermore, one end of the first vacuum valve is connected to a vacuum drying box, and the other end is connected to an air inlet of a high vacuum diffusion pump. The second vacuum gauge is connected to a vacuum pipeline between the air inlet of the high vacuum diffusion pump and the first vacuum valve.

[0009] Furthermore, one end of the second vacuum valve is connected to the vacuum drying box, and the other end is connected to the air inlet of the low vacuum pump.

[0010] Furthermore, one end of the third vacuum valve is connected to the cleaning port of the high vacuum diffusion pump, and the other end is connected to the air inlet of the low vacuum pump and the vacuum pipeline between the second vacuum valve.

[0011] A process method for vacuum high temperature cleaning adsorption activation device of thermal insulation spacer, comprising the following contents:

[0012] Step 1: Place the material on the sample rack of the vacuum drying oven, use a low vacuum pump to heat and evacuate the vacuum drying oven through the evacuation valve, and when the vacuum degree measured by the first vacuum gauge is less than 50Pa, close the evacuation valve;

[0013] Step 2: Open the charging valve and fill the vacuum drying oven with high-purity nitrogen of about 0.08MPa through the high-purity nitrogen interface, and then close the charging valve; after maintaining the high temperature of 300℃ for half an hour, heat the vacuum drying oven and evacuate it. When the vacuum is evacuated to less than 30Pa, close the evacuation valve;

[0014] Step 2: Open the charging valve and fill the vacuum drying oven with 0.08MPa of high-purity nitrogen for the second time, and then close the charging valve; then heat the vacuum drying oven to evacuate, and when the vacuum is evacuated to less than 15Pa, close the evacuation valve;

[0015] Step 3: Open the charging valve and fill the vacuum drying oven with 0.08MPa high-purity nitrogen for the third time, and then close the charging valve; then heat and evacuate the vacuum drying oven, and after evacuating to less than 5Pa, open the high vacuum diffusion pump to continuously heat and evacuate the vacuum drying oven through the evacuation valve, then stop heating and close the evacuation valve;

[0016] Step 4: Open the charging valve and charge the vacuum drying oven with 0.11 MPa of high-purity nitrogen for the fourth time, and cool it naturally to room temperature. During the natural cooling process, continue to charge the vacuum drying oven with high-purity nitrogen to maintain a slight positive pressure of 0.11 MPa in the vacuum drying oven.

[0017] Furthermore, in step 1, the temperature of the heated vacuum drying oven is controlled by a temperature controller and maintained at 250-350°C.

[0018] Furthermore, after maintaining the high temperature of 300° C. for half an hour in step 2 and step 3, the vacuum drying oven is heated and evacuated.

[0019] Furthermore, in step three, a high vacuum diffusion pump is turned on to continuously heat and evacuate the vacuum drying oven through the evacuation valve for 4 hours.

[0020] Furthermore, the method further comprises step 5, after naturally cooling to room temperature, opening the door of the vacuum drying oven, quickly taking out the processed materials, and sealing them in plastic packaging bags filled with high-purity nitrogen for standby use.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The vacuum high-temperature cleaning adsorption activation device and process of the present invention treat spacers such as polyimide aerogel fiber paper or polyimide aerogel fiber cloth and glass fiber paper, and utilize the adsorption characteristics of the micropores of the polyimide aerogel fiber paper after displacement drying and activation at ultra-low temperature to adsorb residual gas molecules between the layers of the composite multi-layer insulation body, thereby improving the vacuum degree between the layers and extending the high vacuum maintenance time between the layers. The super insulation characteristics of the aerogel are utilized to block the solid heat transfer in the multi-layer insulation body close to the ultra-low temperature cold surface. The treated spacers can be applied to the interlayers of the multi-layer insulation structure, and are particularly suitable for the manufacture and application of ultra-low temperature insulation and cryogenic liquid containers such as liquid hydrogen and liquid helium, thereby greatly improving their insulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic structural diagram of the vacuum high temperature cleaning adsorption activation device of the present invention.

[0024] Figure 2 It is a schematic diagram of the structure of the thermal insulation spacer used in the present invention.

[0025] in:

[0026] Vacuum drying oven 1, sample rack 2, temperature measurement controller 3, first vacuum gauge 4, vent valve 5, first vacuum valve 6, second vacuum valve 7, third vacuum valve 8, second vacuum gauge 9, high vacuum diffusion pump 10, low vacuum pump 11, outer wall of inner container 12, first spacer 13, second spacer 14, third spacer 15, reflective film 16, vacuum cavity 17, inner wall of outer container 18. DETAILED DESCRIPTION

[0027] In order to better understand the technical solution of the present invention, the following will be described in detail in conjunction with the relevant illustrations. It should be understood that the following specific embodiments are not intended to limit the specific implementation of the technical solution of the present invention, and are only implementations that can be adopted by the technical solution of the present invention. It should be noted that the description of the positional relationship of each component in this article, such as component A being located above component B, is based on the description of the relative positions of the components in the illustration, and is not intended to limit the actual positional relationship of the components.

[0028] Embodiment 1:

[0029] See also Figure 1 , Figure 1 A schematic diagram of the structure of a cleaning adsorption activation device for a spacer of a multi-layer thermal insulation composite structure is drawn. As shown in the figure, the spacer of the multi-layer thermal insulation composite structure needs to undergo a vacuum high-temperature cleaning adsorption activation process before use, and a vacuum high-temperature cleaning adsorption activation device is used, which includes a vacuum drying oven 1, the vacuum drying oven 1 includes a door, a sample rack 2 is provided in the vacuum drying oven 1, and a spacer is provided on the sample rack 2, and the spacer is polyimide aerogel fiber paper or polyimide aerogel fiber cloth and glass fiber paper.

[0030] The vacuum drying oven 1 is provided with a temperature measurement controller 3, the vacuum drying oven 1 is connected to a first vacuum gauge 4, the vacuum drying oven 1 is connected to a vent valve 5, one end of the vent valve 5 is connected to a high-purity nitrogen interface, and the other end is connected to the vacuum drying oven 1.

[0031] The vacuum drying box 1 is respectively connected to a first vacuum valve 6 and a second vacuum valve 7 , the first vacuum valve 6 is respectively connected to a second vacuum gauge 9 and a high vacuum diffusion pump 10 , the second vacuum valve 7 is respectively connected to a third vacuum valve 8 and a low vacuum pump 11 , and the third vacuum valve 8 is connected to the high vacuum diffusion pump 10 .

[0032] The above vacuum high temperature cleaning adsorption activation process includes the following contents:

[0033] (1) Place polyimide aerogel fiber paper (cloth) and glass fiber paper on the sample rack of a vacuum drying oven, heat and evacuate the vacuum drying oven through the F2 evacuation valve using a low vacuum pump, and control the heating temperature to be maintained at about 300°C by a temperature controller. When the vacuum degree measured by the first vacuum gauge is less than 50 Pa, close the F2 evacuation valve;

[0034] (2) Open the charging valve and fill the vacuum drying oven with high-purity nitrogen of about 0.08MPa through the high-purity nitrogen interface, and then close the charging valve; after maintaining the high temperature of 300℃ for half an hour, heat the vacuum drying oven and evacuate it. When the vacuum is evacuated to less than 30Pa, close the F2 evacuation valve;

[0035] (3) Open the charging valve and fill the vacuum drying oven with 0.08MPa high-purity nitrogen for the second time, then close the charging valve; maintain the high temperature of 300℃ for half an hour, heat the vacuum drying oven and evacuate it. When the vacuum is evacuated to less than 15Pa, close the F2 evacuation valve;

[0036] (4) Open the charging valve for the third time to charge the vacuum drying oven with 0.08MPa of high-purity nitrogen, and then close the charging valve; after maintaining the high temperature of 300°C for half an hour, heat the vacuum drying oven to evacuate it, and after evacuating it to less than 5Pa, start the high vacuum diffusion pump to heat and evacuate the vacuum drying oven through the F1 evacuation valve for 4 hours, then stop heating and close the F1 evacuation valve;

[0037] (5) Open the charging valve for the fourth time and charge the vacuum drying oven with 0.11 MPa of high-purity nitrogen. Cool it naturally to room temperature. Continue to charge the vacuum drying oven with high-purity nitrogen during the process of cooling it naturally to room temperature to maintain a slight positive pressure of 0.11 MPa in the vacuum drying oven.

[0038] (6) After naturally cooling to room temperature, open the door of the vacuum drying oven, quickly take out the treated polyimide aerogel fiber paper (cloth) and glass fiber paper, and seal them in plastic packaging bags filled with high-purity nitrogen for later use.

[0039] See also Figure 2 , Figure 2 A schematic diagram of the structure of a vacuum high-temperature cleaning adsorption activation device for an insulating spacer is drawn. As shown in the figure, the insulating spacer processed by the vacuum high-temperature cleaning adsorption activation device of the present invention is applied to a multi-layer insulating composite structure, which includes three insulating layers arranged in sequence between the inner container outer wall 12 and the outer container inner wall 18 of the double-walled low-temperature container: a first group of insulating layers, a second group of insulating layers and a third group of insulating layers, wherein the first group of insulating layers is coated on the surface of the inner container outer wall 12, and a vacuum cavity 17 is provided between the third group of insulating layers and the outer container inner wall 18.

[0040] Reflective films 16 are provided between the first group of heat-insulating layers, the second group of heat-insulating layers and the third group of heat-insulating layers.

[0041] The first group of insulation layers is an ultra-low temperature insulation layer, including 10 to 15 layers of first spacers 13, and a reflective film 16 is provided between two adjacent layers of first spacers 13; the first spacer 13 is polyimide aerogel fiber paper or polyimide aerogel fiber cloth, the thickness of the first layer of first spacers 13 close to the outer wall 12 of the inner container is 0.15 mm to 0.3 mm, and the thickness of each layer of first spacers 13 decreases by 0.05 mm in sequence until the thickness of the first spacers 13 decreases to 0.05 mm and remains unchanged, and the total thickness of the first group of insulation layers is 20 to 25 mm; the layer density of the first layer of first spacers 13 close to the outer wall 12 of the inner container is 3 to 6 / cm, the layer density of the second layer of first spacers 13 is 4 to 9 / cm, the layer density of the third layer of first spacers 13 is 5 to 15 / cm, the layer density of the fourth layer of first spacers 13 is 6 to 20 / cm, and the layer density of the first spacers 13 from the fifth layer to the last layer is 10 / cm.

[0042] The second group of insulation layers is a low-temperature insulation layer, including 10 to 15 layers of second spacers 14, and a reflective film 16 is provided between two adjacent layers of second spacers 14; the second spacer 14 is polyimide aerogel fiber paper or polyimide aerogel fiber cloth, and the layer density of the second spacer 14 is greater than 15 / cm; the total thickness of the second group of insulation layers is not more than 10 mm.

[0043] The third group of insulation layers is a sub-low temperature insulation layer, including 10 to 15 layers of third spacers 15, and a reflective film 16 is provided between two adjacent layers of the third spacers 15; the third spacers 15 are glass fiber paper, and the layer density of the third spacers 15 is greater than 20 / cm; the total thickness of the third group of insulation layers is not greater than 10 mm.

[0044] The reflective film 16 is a metal foil such as a metal aluminum foil or a metal copper foil, and the thickness of the metal foil is less than 0.02 mm and the emissivity is less than 0.006.

[0045] The thickness of a single layer of polyimide aerogel fiber paper or polyimide aerogel fiber cloth is less than 0.05 mm.

[0046] The coating process of the above-mentioned multi-layer thermal insulation composite structure includes the following contents:

[0047] (1) The winding process is carried out in a room with a constant temperature and humidity environment. The temperature in the room is controlled at 20℃±2℃, and the humidity is controlled below 50% relative humidity. Operators must wear masks, hats, and gloves, and the number of people is strictly limited;

[0048] (2) The sealed polyimide aerogel fiber paper (cloth), glass fiber paper and aluminum foil are unpacked in the winding room and wrapped according to the conventional wrapping process, and the wrapping is completed within the specified time;

[0049] (3) Implementation of the first insulation layer:

[0050] Before the first group of multi-layer insulation coating of the inner container, the outer surface of the inner container is first cleaned and dried, and then a layer of polyimide aerogel fiber paper (cloth) is evenly coated on the outer surface of the inner container, and the seams should overlap. The coating thickness of the polyimide aerogel fiber paper (cloth) should be uniform, within the range of 0.15-0.3mm, without leaving any gaps; then a layer of metal foil is coated; the subsequent coating principle is a combination of a spacer layer inside and a reflective film outside: the second layer can be coated with a composite layer of polyimide aerogel fiber paper (cloth) and metal foil that has been pre-compounded, or it can be coated separately; the thickness of the second layer of polyimide aerogel fiber paper (cloth) is reduced by 0.0 on the basis of the previous layer 5mm, and then the thickness of each layer of the spacer material polyimide aerogel fiber paper (cloth) decreases by 0.05mm from the inside to the outside until it is reduced to a single layer of polyimide aerogel fiber paper (cloth); the thickness of a single layer of polyimide aerogel fiber paper (cloth) should be less than 0.05mm, and it is wrapped until 10 to 15 combined layers, and the total thickness of the first group of insulation layers should be within 20 to 25mm; the total thickness of each group of insulation layers is controlled by measuring the circumference and adjusting the tightness. The first group of insulation layers is a variable density insulation layer, and its insulation principle is to increase the thickness of the insulation layer at the ultra-low temperature end to minimize the solid thermal conductivity component when the temperature gradient at the ultra-low temperature end is large;

[0051] (4) Implementation of the second insulation layer:

[0052] The second group of thermal insulation layers is coated on the basis of the first group of thermal insulation layers; the reflective film in the second group of thermal insulation layers is aluminum foil, and the spacer is a single layer of polyimide aerogel fiber paper (cloth) with the smallest possible thickness; the first group of thermal insulation layers is evenly wrapped with a pre-compounded strip-shaped single layer combination until 10 to 15 combined layers are coated, the total thickness of the second group of thermal insulation layers should be within 10 mm, and the layer density of the second group of thermal insulation layers is greater than 15 / cm;

[0053] (5) Implementation of the third insulation layer:

[0054] The third group of thermal insulation layers is coated on the basis of the second group of thermal insulation layers; the reflective film in the third group of thermal insulation layers is aluminum foil, and the spacer is glass fiber paper; the pre-compounded strip-shaped single-layer combination is evenly wrapped and coated on the second group of thermal insulation layers until 10 to 15 combined layers are coated, the total thickness of the third group of thermal insulation layers should be within 10 mm, and the layer density of the third group of thermal insulation layers is greater than 20 / cm;

[0055] After the coating is completed, the outer container is assembled and welded, and the assembly and welding are completed within the specified time; thus, the high vacuum ultra-low temperature multi-layer insulation composite structure installation assembly is completed;

[0056] For the container that has been assembled and welded, the interlayer between the inner and outer containers is roughly vacuumed and waits for the next process.

[0057] The above are only specific application examples of the present invention and do not constitute any limitation on the protection scope of the present invention. Any technical solution formed by equivalent transformation or equivalent replacement shall fall within the protection scope of the present invention.

Claims

1. A vacuum high temperature cleaning adsorption activation process for an insulating spacer, characterized in that: A vacuum high-temperature cleaning adsorption activation device for an insulating spacer comprises a vacuum drying oven (1), the vacuum drying oven (1) comprising a chamber door, a sample rack (2) being arranged inside the vacuum drying oven (1), and a spacer being arranged on the sample rack (2); a temperature measurement controller (3) being arranged inside the vacuum drying oven (1), the vacuum drying oven (1) being connected to a first vacuum gauge (4), the vacuum drying oven (1) being connected to a venting valve (5), one end of the venting valve (5) being connected to a high-purity nitrogen interface, and the other end being connected to the inside of the vacuum drying oven (1); The vacuum drying oven (1) is connected to a first vacuum valve (6), and the first vacuum valve (6) is respectively connected to a second vacuum gauge (9) and a high vacuum diffusion pump (10); the vacuum drying oven (1) is respectively connected to a second vacuum valve (7), and the second vacuum valve (7) is respectively connected to a third vacuum valve (8) and a low vacuum pump (11); the third vacuum valve (8) is connected to a high vacuum diffusion pump (10); The thermal insulation spacer comprises three layers of thermal insulation layers in sequence: a first group of thermal insulation layers, a second group of thermal insulation layers and a third group of thermal insulation layers, wherein a reflective film (16) is arranged between the first group of thermal insulation layers, the second group of thermal insulation layers and the third group of thermal insulation layers; the first group of thermal insulation layers is an ultra-low temperature thermal insulation layer, comprising 10 to 15 layers of first spacers (13), wherein a reflective film (16) is arranged between two adjacent layers of first spacers (13); the second group of thermal insulation layers is a low temperature thermal insulation layer, comprising 10 to 15 layers of second spacers (14), wherein a reflective film (16) is arranged between two adjacent layers of second spacers (14); the third group of thermal insulation layers is a sub-low temperature thermal insulation layer, comprising 10 to 15 layers of third spacers (15), wherein a reflective film (16) is arranged between two adjacent layers of third spacers (15); The vacuum high temperature cleaning adsorption activation process of the above-mentioned thermal insulation spacer includes the following contents: Step 1: Place the material on the sample rack of the vacuum drying oven, use a low vacuum pump to heat and evacuate the vacuum drying oven through the evacuation valve, and when the vacuum degree measured by the first vacuum gauge is less than 50Pa, close the evacuation valve; Step 2: Open the charging valve and fill the vacuum drying oven with 0.08MPa high-purity nitrogen through the high-purity nitrogen interface, and then close the charging valve; after maintaining the high temperature of 300°C for half an hour, heat the vacuum drying oven and evacuate it. When the vacuum is evacuated to less than 30Pa, close the evacuation valve; Step 2: Open the charging valve and fill the vacuum drying oven with 0.08MPa of high-purity nitrogen for the second time, and then close the charging valve; then heat the vacuum drying oven to evacuate, and when the vacuum is evacuated to less than 15Pa, close the evacuation valve; Step 3: Open the charging valve and fill the vacuum drying oven with 0.08MPa high-purity nitrogen for the third time, and then close the charging valve; then heat and evacuate the vacuum drying oven, and after evacuating to less than 5Pa, open the high vacuum diffusion pump to continuously heat and evacuate the vacuum drying oven through the evacuation valve, then stop heating and close the evacuation valve; Step 4: Open the charging valve and charge the vacuum drying oven with 0.11 MPa of high-purity nitrogen for the fourth time, cool it naturally to room temperature, and continue to charge the vacuum drying oven with high-purity nitrogen during the natural cooling process to maintain a slightly positive pressure of 0.11 MPa in the vacuum drying oven; The thermal insulation spacer is applied to a multi-layer thermal insulation composite structure, and the coating process of the multi-layer thermal insulation composite structure includes the following contents: The first set of insulation layers was implemented: First, evenly coat a layer of polyimide aerogel fiber spacer on the outer surface of the container that is close to the inner container. The seams should overlap, and the coating thickness of the polyimide aerogel fiber spacer should be uniform, with a thickness within 0.15~0.3mm and no gaps; then coat a layer of metal foil; a reflective film is set between adjacent spacers; the thickness of the second layer of polyimide aerogel fiber spacer decreases by 0.05mm on the basis of the previous layer, and the thickness of each layer of the spacing material polyimide aerogel fiber spacer from the inside to the outside decreases by 0.05mm in sequence until it is reduced to a single layer of polyimide aerogel fiber spacer; the single layer thickness of the polyimide aerogel fiber spacer should be less than 0.05mm, and it is coated until 10~15 combined layers are formed. The total thickness of the first group of insulation layers should be within 20~25mm; The second set of insulation layers was implemented: The second group of thermal insulation layers is coated on the basis of the first group of thermal insulation layers; the reflective film in the second group of thermal insulation layers is aluminum foil, and the spacer is a single layer of polyimide aerogel fiber spacer; the first group of thermal insulation layers is evenly wrapped with a pre-compounded strip-shaped single layer combination until 10 to 15 combined layers are coated, the total thickness of the second group of thermal insulation layers should be within 10 mm, and the layer density of the second group of thermal insulation layers is greater than 15 / cm; The third set of insulation layer implementation: The third group of thermal insulation layers is coated on the basis of the second group of thermal insulation layers; the reflective film in the third group of thermal insulation layers is aluminum foil, and the spacer is glass fiber paper; the pre-compounded strip-shaped single-layer combination is evenly wrapped and coated on the second group of thermal insulation layers, and the coating is completed until 10 to 15 combined layers, the total thickness of the third group of thermal insulation layers should be within 10 mm, and the layer density of the third group of thermal insulation layers is greater than 20 / cm.

2. A vacuum high temperature cleaning adsorption activation process for a thermal insulation spacer according to claim 1, characterized in that: In step 1, the temperature of the heating vacuum drying oven is controlled by a temperature controller and maintained at 250-350°C.

3. The vacuum high temperature cleaning adsorption activation process of a thermal insulation spacer according to claim 1, characterized in that: After maintaining the high temperature of 300° C. for half an hour in step 2 and step 3, the vacuum drying oven is heated and evacuated.

4. The vacuum high temperature cleaning adsorption activation process of a thermal insulation spacer according to claim 1, characterized in that: In step 3, the high vacuum diffusion pump is turned on to continuously heat and evacuate the vacuum drying oven through the evacuation valve for 4 hours.

5. The vacuum high temperature cleaning adsorption activation process of a thermal insulation spacer according to claim 1, characterized in that: The method further comprises step 5, after naturally cooling to room temperature, opening the door of the vacuum drying box, quickly taking out the processed materials, sealing them in plastic packaging bags filled with high-purity nitrogen for later use.

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