A device for testing the thermal stability of aerogel

Abstract

The invention relates to the technical field of aerogel performance detection, and specifically proposes an aerogel thermal stability testing device; the device comprises an adsorption temperature measuring platform, a heat insulation cover which is lifted and arranged just above the adsorption temperature measuring platform, a heating plate which is hinged and sealed at the top open end of the heat insulation cover, a partition mechanism for dividing the area inside the heat insulation cover to form a dehumidification chamber, and two pressing plate mechanisms assembled on the heat insulation cover; the device provided by the invention can perform preliminary heat insulation test on the thermal stability of aerogel in a relatively uniform, closed and controllable test space, and can perform indiscriminate rapid dehumidification treatment on the test material plate before the test, thereby eliminating the influence of multiple variables such as the surrounding environment and the humidity of the material itself on the test, improving the accuracy and authenticity of the test result, and facilitating objective and accurate performance judgment.

Description

Technical Field

[0001] The invention relates to the technical field of aerogel performance detection, and specifically proposes an aerogel thermal stability testing device. Background Art

[0002] Aerogel is an ultralight porous solid material derived from gel. It is one of the lowest known solid materials with the lowest density. It combines a unique nanostructure, ultra-low thermal conductivity and extremely high porosity. Therefore, it has extremely low thermal conductivity, excellent thermal insulation, flame retardancy, good sound absorption, light transmittance and strong adsorption, and has important applications in science and engineering.

[0003] Aerogel has an extremely high porosity, and the pores are mostly filled with air. When the humidity in the air is too high, water vapor will fill the pores of the aerogel. Aerogel with excessive humidity will increase the thermal conductivity of the material itself and reduce its thermal insulation. In the field of construction engineering, aerogel materials are often used as flame retardant and thermal insulation materials. In order to ensure that the material has more reliable thermal insulation performance, general aerogel materials are usually modified and processed so that the modified aerogel material has better hydrophobicity than general aerogel, thereby showing low water absorption and high thermal insulation.

[0004] When aerogel materials are used for thermal insulation and flame retardant purposes, they need to have excellent thermal insulation and thermal stability. Thermal insulation reflects the ability of aerogel to block heat, and thermal stability reflects the ability of aerogel to maintain its physical structure and chemical properties stable in a high temperature environment. Therefore, in the production process of this type of aerogel, it is necessary to test and verify the thermal insulation and thermal stability of aerogel. For flame retardant and thermal insulation aerogel, generally the stronger the thermal insulation, the better its thermal stability. However, thermal stability usually requires a comprehensive evaluation of multiple indicator dimensions, and the thermal insulation test is relatively simple, and the evaluation index is relatively single. Therefore, when testing aerogel materials used as flame retardant and thermal insulation, the aerogel can be first tested for thermal insulation, so that the aerogel that meets the thermal insulation test requirements can be further tested for thermal stability. The thermal insulation test can be used as a preliminary test process for the entire thermal stability test and used for screening tests to improve the test verification efficiency of the entire test.

[0005] In the existing preliminary thermal insulation test of aerogel thermal stability, one side of the aerogel test material is usually heated, and the temperature of the other side of the aerogel test material is detected to detect the thermal insulation effect. The detection method is usually simple, but there are many factors affecting the test, which affect the final authenticity and accuracy of the test. Specifically, it can be seen as follows: (1) The test is basically carried out in an open environment, and the test results are easily affected by environmental factors, such as the temperature, humidity, wind speed of the test environment, and the convection conduction of heat after heating with the air. Many environmental variables greatly affect the accuracy of the test.

[0006] (2) During testing, multiple temperature measurements and point heating methods corresponding to the temperature measurement points are often used. On the one hand, this causes the aerogel heating surface to be non-uniform in size. On the other hand, the aerogel heating surface is heated unevenly, which increases the test variables.

[0007] (3) Aerogels usually contain moisture in their pores and on their surfaces, but no uniform and effective dehumidification treatment was performed before testing, which resulted in the thermal conductivity of the aerogels in the early stages of the test being larger than the actual thermal conductivity, which in turn affected the overall evaluation and judgment of the thermal insulation properties of the aerogels.

[0008] In summary, the thermal insulation test methods and approaches used in existing tests have many problems of inconsistency in test variables. The test results are interfered by many factors, which affects the judgment of thermal insulation and affects the preliminary evaluation of the thermal stability of aerogels and the conduct of subsequent tests. Summary of the invention

[0009] In order to solve the above problems, the present invention provides an aerogel thermal stability testing device, which is used to solve the problems mentioned in the above background technology.

[0010] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme to achieve the goal: an aerogel thermal stability testing device, comprising: an adsorption temperature measuring platform, used for adsorbing, fixing and measuring the temperature of the lower end surface of the aerogel test material plate; a heat insulation cover, which is arranged to be lifted and lowered just above the adsorption temperature measuring platform, and when descending, its bottom end can form a closed docking with the adsorption temperature measuring platform, and a vertical downward heating channel is arranged inside; a heating plate, which is hinged and closed at the top open end of the heating channel of the heat insulation cover, and heats the upper end surface of the test material plate through the heating channel; a partition mechanism, including two dehumidification partitions arranged horizontally and relatively slidingly in the heat insulation cover, and the two dehumidification partitions It is capable of separating the heating channel area located above to form a dehumidification chamber; an air inlet channel and an exhaust channel connected to the dehumidification chamber are arranged in the dehumidification partition; when the dehumidification partition completely separates or completely opens the heating channel, the two channels are opened or closed accordingly; and two pressing plate mechanisms are arranged in a one-to-one correspondence with the two dehumidification partitions; the pressing plate mechanism includes a pressing plate horizontally slidably installed at the bottom end of the heat insulation cover and used for pressing the test material plate, and a driving component connected to the pressing plate and extending into the heat insulation cover; in the process of the two dehumidification partitions sliding completely away from the heating channel and continuing to move away, the dehumidification partition drives the pressing plate to extend into the heating channel through the driving component.

[0011] Preferably, the outside of the heat insulation cover is provided with two air inlet ends that can pass the external air into the air inlet channels of the two dehumidification partitions one by one; when the heating channel is completely separated by the two dehumidification partitions, the air inlet end and the corresponding air inlet channel in the dehumidification partition are in a docking and connecting state, and when the two dehumidification partitions completely avoid the heating channel, the air inlet end and the corresponding air inlet channel in the dehumidification partition are in a staggered and disconnected state.

[0012] Preferably, the adsorption temperature measuring platform includes: a material supporting base, used for horizontally limiting the placement of the test material plate; an adsorption plate, mounted on the material supporting base, for pneumatically adsorbing and fixing the lower end surface of the test material plate; and a plurality of temperature measuring components, all of which are vertically elastically connected to the upper end surface of the adsorption plate and all vertically pass through the supporting surface of the material supporting base.

[0013] When the test material plate is adsorbed and fixed on the supporting surface of the support base, the temperature sensing end of the temperature measuring component is elastically pressed against the lower end surface of the test material plate.

[0014] Preferably, the heat insulation cover comprises: a cylindrical cover; two horizontally symmetrically arranged pressure plate bins are arranged at the bottom end of the cylindrical cover, two pressure plate mechanisms are assembled at the two pressure plate bins one by one, the pressure plates are horizontally slidably installed in the pressure plate bins, and the lower end surfaces of the pressure plates are completely exposed in the pressure plate bins; a partition bin, horizontally fixed at the top end of the cylindrical cover; two dehumidification partitions are horizontally slidably installed in the partition bin; and a hinge cylinder, coaxially arranged with the cylindrical cover and fixed at the top end of the partition bin; the heating plate is hinged and closed at the top end port of the hinge cylinder; the partition bin is respectively connected with the hinge cylinder and the cylindrical cover above and below and together constitute a heating channel.

[0015] Preferably, the dehumidification baffle includes: an outer shell bin, which is a hollow shell structure, horizontally slidably installed in the baffle bin, and the two ends of the outer shell bin in the sliding direction are respectively in a closed and open state; a plurality of protrusions are provided on the upper end surface of the outer shell bin, and the protrusions extend along the sliding direction of the outer shell bin; and an embedded bin, which is embedded in the cavity of the outer shell bin from the open end of the outer shell bin; the embedded bin includes a fixing strip fixed in the cavity of the outer shell bin and a plurality of airway tubes fixed on the fixing strip, the airway tubes are hollow in structure, and the plurality of airway tubes are plugged into and matched in a one-to-one manner in the inner cavity positions of the plurality of protrusions on the outer shell bin.

[0016] Corresponding air holes are provided between the airway tube and the raised portion, which can be connected with the air inlet end and introduce external air. Corresponding air holes are also provided between the airway tube and the raised portion, which discharge the air introduced into the airway tube into the dehumidification chamber. The inner cavity of the outer shell warehouse is divided by the embedded warehouse to form an exhaust chamber. The upper end surface of the outer shell warehouse is provided with air holes for passing the air in the dehumidification chamber into the exhaust chamber. The closed end of the outer shell warehouse away from the opening is connected with an exhaust pipe for discharging the air in the exhaust chamber to the outside, and the exhaust pipe extends from the interior of the partition warehouse to the outside.

[0017] Preferably, the partition bin comprises: a partition box, which is a rectangular box structure, and the bottom is fixed on the top of the cylindrical cover; a closed cover plate, which is sealed and fixed on the top of the partition box, and the bottom end of the hinge cylinder is fixed on the upper end surface of the closed cover plate; and a guide groove plate, which is fixed on the bottom end surface of the closed cover plate and embedded in the bin of the partition box, and the bottom end surface of the guide groove plate is provided with a profile guide groove that slides in contact with the upper end surface of the outer shell bin; the air inlet end is fixed on the upper end surface of the closed cover plate, and air holes are correspondingly provided between the closed cover plate and the guide groove plate to connect the air inlet end with the air inlet channel.

[0018] Preferably, touch blocks are fixed on both horizontal sides of the outer wall of the shell bin that are located perpendicular to its sliding direction, and the touch blocks slide in fit with the contour guide grooves of the guide groove plate; the driving assembly includes: a hinge seat fixed on the bottom end surface of the partition box; two toggle rods, which are hinged on the hinge seat through the same hinge axis, and a torsion spring for resetting the toggle rods is installed on the hinge seat; two toggle rods extend into the bin of the partition box, and the two toggle rods are aligned one by one with the two touch blocks on the corresponding dehumidification partitions; two guide rods are fixedly connected to the bottom ends of the two toggle rods one by one; and a sliding plate, which is slidably mounted on the two guide rods and hinged on the pressure plate.

[0019] When the two moisture-discharging partitions slide away from each other, the trigger block triggers the toggle rod, so that the driving assembly pushes the pressing plate to slide from the pressing plate bin into the cylinder of the cylindrical cover.

[0020] Preferably, a supporting groove with a limited position for placing the test material plate is formed on the upper end surface of the supporting base; a heat-insulating retaining ring is arranged at the bottom end of the supporting base and aligned with the supporting groove; the adsorption plate is embedded and installed in the heat-insulating retaining ring; a clamping ring is also threadedly rotatably installed in the heat-insulating retaining ring, and the adsorption plate is clamped up and down between the bottom end surface of the supporting groove and the upper end surface of the clamping ring; a plurality of adsorption heads are arranged on the adsorption plate and vertically pass through the supporting groove, and the top of the adsorption head is flush with the upper end surface of the supporting groove.

[0021] Preferably, a filter layer for dehumidifying external air is provided in the air duct at the air inlet end; and a humidity sensor for detecting the humidity of the exhaust air is mounted on the exhaust pipe.

[0022] Preferably, a temperature sensor for detecting the temperature of the upper heating surface of the test material plate is installed on the pressing plate.

[0023] The above technical scheme has the following advantages or beneficial effects: the present invention provides an aerogel thermal stability testing device, which uses thermal insulation test as a preliminary test of thermal stability test to indirectly evaluate the thermal stability state of aerogel, changes the existing open test method used in thermal insulation test, and realizes multiple isolations between the test environment and the surrounding environment through the cooperation of adsorption temperature measuring platform and heat insulation cover, thereby ensuring the uniformity and stability of the test environment, avoiding the influence of multiple environmental variables such as temperature, humidity, wind force of the surrounding environment and air convection after heating on the test during open test, the test material plate can be fixed for test through the adsorption temperature measuring platform, and the test material plate of the same size can be limited and placed, and the test material plate can be fully covered and evenly heated with adjustable temperature by using a heating plate, and based on the closed and adjustable In the heated test space, a partition mechanism that can form a dehumidification chamber is integrated and installed. Before the test, indiscriminate dehumidification treatment can be carried out in the unified and closed test space. The dehumidification process is simple and easy to operate, and the effect of enhanced thermal conductivity of aerogel caused by humidity on the actual thermal insulation effect can be eliminated. In addition, a pressing plate mechanism is provided in conjunction with the partition mechanism, which can cooperate with the adsorption temperature measuring platform to complete the fitting of temperature measuring points on the upper and lower end surfaces of the test material plate. In summary, the device provided by the present invention can carry out preliminary thermal insulation testing of thermal stability of aerogel in a relatively unified, closed and controllable test space, and can carry out indiscriminate rapid dehumidification treatment on the test material plate before the test, eliminating the influence of multiple variables such as the surrounding environment and the humidity of the material itself on the test, thereby improving the accuracy and authenticity of the test results and facilitating objective and accurate performance judgment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The present invention and its features, configurations and advantages will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings. The same reference numerals indicate the same parts throughout the drawings, which are not drawn to scale, with emphasis on illustrating the subject matter of the present invention.

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of an aerogel thermal stability testing device provided by the present invention.

[0026] Figure 2 It is a side view of an aerogel thermal stability testing device provided by the present invention.

[0027] Figure 3 yes Figure 2 Sectional view of AA.

[0028] Figure 4 It is a three-dimensional cross-sectional view of the adsorption temperature measuring platform.

[0029] Figure 5 It is a three-dimensional cross-sectional view of the adsorption temperature measuring platform without the support base.

[0030] Figure 6 It is a three-dimensional cross-sectional view of the partition mechanism and the pressure plate mechanism assembled on the heat insulation cover.

[0031] Figure 7 yes Figure 6 A three-dimensional cross-sectional view of the assembly structure shown in another perspective.

[0032] Figure 8 It is a three-dimensional structural diagram of the connection between the cylindrical cover and the heat insulation box.

[0033] Fig. 9 It is a three-dimensional structural diagram of the connection between the hinge seat cylinder, the closed cover plate and the guide groove plate.

[0034] Fig.10 It is a three-dimensional structural diagram of the dehumidification partition.

[0035] Fig.11 It is a three-dimensional structural diagram of the outer shell warehouse.

[0036] Fig.12 It is a three-dimensional structural diagram of the embedded warehouse.

[0037] Fig.13 It is a three-dimensional structural diagram of the pressure plate mechanism.

[0038] In the figure: 1, device table; 11, guide column; 2, adsorption temperature measuring table; 21, support base; 211, support groove; 212, heat insulation retaining ring; 213, sealing retaining ring; 22, adsorption plate; 221, air chamber; 222, air chamber plate; 223, adsorption head; 23, temperature measuring element; 231, spring; 232, temperature sensing patch; 233, guide pin; 24, clamping support ring; 3, heat insulation cover; 31, cylinder cover; 311, pressure plate bin; 32, partition bin; 321, partition box; 322, closing cover Plate; 323, guide groove plate; 33, hinge seat cylinder; 4, heating plate; 5, partition mechanism; 51, outer shell bin; 511, trigger block; 512, exhaust pipe; 513, raised portion; 52, embedded bin; 521, fixing strip; 522, airway tube; 53, air inlet end; 531, main air pipe; 532, air pipe end; 533, branch air pipe; 6, pressure plate mechanism; 61, pressure plate; 62, drive assembly; 621, hinge seat; 622, toggle rod; 623, guide rod; 624, sliding plate. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0041] like Figure 1 , Figure 3 and Figure 4 As shown, an aerogel thermal stability testing device comprises a device table 1, on which is mounted an adsorption temperature measuring table 2 for adsorbing, fixing and measuring the temperature of the lower end surface of an aerogel test material plate. The adsorption temperature measuring table 2 comprises a disc-shaped supporting base 21 which is embedded and fixed on the surface of the device table 1. A supporting groove 211 for placing the aerogel test material plate in a limited position is centrally provided on the upper end surface of the supporting base 21. The supporting groove 211 is circular. The aerogel test material plate actually used for the test can be randomly intercepted from the aerogel material being produced and formed. The intercepted aerogel test material plate is circular, and the radius of the test material plate is slightly smaller than the radius of the supporting groove 211. The edge step position of the supporting groove 211 is a chamfered structure, which is convenient for guiding the test material plate to fall into the supporting groove 211. A sealing retaining ring 213 is arranged on the upper end surface of the support base 21 around the support groove 211 , and a cylindrical heat insulating retaining ring 212 is arranged on the bottom end surface of the support groove 211 opposite to the support groove 211 . The sealing retaining ring 213 and the heat insulating retaining ring 212 are integrally formed on the support base 21 .

[0042] like Figure 3 , Figure 4 and Figure 5As shown, an adsorption plate 22 for pneumatically adsorbing and fixing the test material plate is embedded in the heat-insulating retaining ring 212 on the support base 21. The adsorption plate 22 is disc-shaped and includes an air chamber bin 221 and an air chamber plate 222 sealed and fixed to the top of the air chamber bin 221. A clamping ring 24 for clamping the adsorption plate 22 is also threadedly installed in the heat-insulating retaining ring 212. By tightening the clamping ring 24, the upper end surface of the air chamber plate 222 is clamped and contacted with the lower end surface of the support base 21, and the lower end surface of the air chamber bin 221 is clamped and contacted with the upper end surface of the clamping ring 24; A square hole is provided at the center of the groove 211, and four square holes are evenly distributed around the center circumference of the support groove 211. Four circular holes are also provided around the center of the support groove 211, and the four circular holes are evenly distributed alternately relative to the four circumferentially distributed square holes; the bottom end of the air chamber warehouse 221 is provided with an external joint that can be connected to the vacuum pump through an air pipe; the air chamber plate 222 is provided with four adsorption heads 223 that vertically pass through the four circular holes in a one-to-one correspondence, and the adsorption heads 223 can perform vacuum negative pressure adsorption, and the top of the adsorption head 223 is aligned with the upper end of the support groove 211. The inner end surface of the air chamber warehouse 221 and the lower end surface of the air chamber plate 222 are provided with circular tubes that can be plugged into each other, a total of five groups, and the circular tubes that are plugged into each other are separated from the air chamber in the adsorption disk 22 to form a circular tube channel; five temperature measuring components 23 are fixed on the upper end surface of the air chamber plate 222, and the five temperature measuring components 23 are assembled in five circular tube channels one by one to form five evenly distributed temperature detection points, and the five temperature measuring components 23 all use the same type of patch temperature sensor for temperature measurement, and the patch temperature sensor can be a fiber grating temperature sensor, or other suitable Temperature sensor; the temperature measuring component 23 includes a temperature sensing patch 232 on the temperature sensor for sensing temperature, a guide pin 233 welded on the temperature sensing patch 232, and a spring 231 sleeved on the guide pin 233. The guide pin 233 is slidably installed in the circular tube channel. A connecting wire is led out of the guide pin 233 and connected to the temperature sensor body. One end of the spring 231 is welded on the temperature sensing patch 232, and the other end of the spring 231 is fixed to the air chamber plate 222 by a welded metal sheet. When the spring 231 is not passively compressed, the temperature sensing patch 232 is exposed upward from the square hole.

[0043] In the present invention, the temperature measuring component 23 is located in the square hole of the support base 21 and has good thermal insulation and sealing properties. In order to enhance the thermal insulation with the external environment and facilitate the observation of the state of the temperature measuring component 23 and the test material plate, in this embodiment, the support base 21 and the adsorption plate 22 are both made of transparent ceramic materials.

[0044] like Figure 2 , Figure 3 , Figure 6 , Figure 7 , Figure 8 and Fig. 9As shown, in order to facilitate the formation of a barrier with the external surrounding environment during testing, a heat insulation cover 3 is assembled in conjunction with the adsorption temperature measuring platform 2. The heat insulation cover 3 is also made of transparent ceramic material, and the heat insulation cover 3 is lifted and arranged directly above the adsorption temperature measuring platform 2; the heat insulation cover 3 includes a hinge cylinder 33, a partition bin 32 and a cylinder cover 31 from top to bottom, the partition bin 32 includes a partition box 321, a closed cover plate 322 and a guide groove plate 323, the partition box 321 is a rectangular box structure, the bottom of which is fixed to the top of the cylinder cover 31, the partition bin 32 and the cylinder cover 31 are integrally formed, four guide pillars 11 are fixed on the device platform 1, and the partition bin 32 is vertically slidably installed on the four guide pillars 11. In this embodiment, an electric hydraulic cylinder (not shown in the figure) can also be vertically fixedly installed on the surface of the device platform 1 The partition bin 32 is fixed to the output end of the electric hydraulic cylinder, so as to drive the heat insulation cover 3 to rise and fall as a whole. When the heat insulation cover 3 descends, the bottom end of the cylindrical cover 31 can be correspondingly inserted into the heat insulation retaining ring 212 to form a reinforced seal; the closed cover plate 322 is sealed and fixed to the top of the partition box 321 by screws, and the bottom end of the hinge seat cylinder 33 is fixed on the upper end surface of the closed cover plate 322; the guide groove plate 323 is fixed on the bottom end surface of the closed cover plate 322 and is embedded in the bin of the partition box 321. The hinge seat cylinder 33 is integrally formed with the closed cover plate 322 and the guide groove plate 323. The hinge seat cylinder 33 coincides with the axis of the cylindrical cover 31 and has the same inner diameter. Obviously, the partition bin 32 is correspondingly connected with the hinge seat cylinder 33 and the cylindrical cover 31 above and below and together constitutes a vertical downward heating channel.

[0045] like Figure 2 and Figure 3 As shown, a heating plate 4 for heating the upper end surface of the test plate is hingedly installed at the top port of the hinge seat cylinder 33, and a handle for opening the heating plate 4 is fixed to the top of the heating plate 4. In the present embodiment, the heating plate 4 is specifically an existing resistance heating plate 4, which can evenly cover and heat the entire heated surface of the test plate through the heating channel, and the heating temperature can be precisely controlled.

[0046] like Figure 6 and Figure 7As shown, in order to facilitate the dehumidification treatment of the test material plate before the test, a partition mechanism 5 for dividing the heating channel in the heat insulation cover 3 to form a dehumidification chamber is also integrated on the heat insulation cover 3; the partition mechanism 5 includes two dehumidification partitions arranged horizontally and relatively sliding in the heat insulation cover 3; when the two dehumidification partitions slide relatively close to each other and the close ends are close to each other, the two dehumidification partitions separate the upper channel area of ​​the heating channel to form a dehumidification chamber, and the dehumidification partition is provided with an air inlet channel for introducing external air into the dehumidification chamber and an air outlet channel for discharging the air in the dehumidification chamber to the outside. In addition, the top of the closed cover plate 322 is also connected and equipped with two air inlet ends 53 which correspond to each other and introduce external air into the air inlet channels of the two dehumidification baffles; when the heating channel is completely separated by the two dehumidification baffles, the air inlet end 53 and the air inlet channel in the corresponding dehumidification baffle are in a docking connection state, and the air inlet channel and the exhaust channel are both in an open state; when the two dehumidification baffles completely avoid the heating channel, the air inlet end 53 and the air inlet channel in the corresponding dehumidification baffle are in a staggered disconnection state, and the air inlet channel and the exhaust channel are both in a closed state.

[0047] like Figure 6 , Figure 7 , Fig.10 , Fig.11 and Fig.12 As shown, in order to avoid high-temperature deformation and rust, the dehumidification partition is also made of ceramic material; the dehumidification partition includes an outer shell bin 51 and an embedded bin 52; the outer shell bin 51 is a hollow shell structure, horizontally slidably installed in the partition bin 32, and the two ends of the outer shell bin 51 in the sliding direction are respectively closed and open; the upper end surface of the outer shell bin 51 is evenly distributed with a plurality of raised portions 513 with circular arc cross-sections, and the raised portions 513 extend along the sliding direction of the outer shell bin 51; the outer wall of the outer shell bin 51 Actuating blocks 511 are welded on both horizontal sides perpendicular to the sliding direction thereof, and there is a sliding fit between the bottom end surface of the outer shell bin 51 and the inner end surface of the partition box 321, as well as between the two triggering blocks 511 and the inner side wall of the partition box 321; a profile guide groove is provided on the bottom end surface of the guide groove plate 323, which is slidingly fitted with the upper end surface of the outer shell bin 51, and the protrusion 513 on the outer shell bin 51 and the two triggering blocks 511 are both embedded in the profile guide groove of the guide groove plate 323.

[0048] like Figure 6 , Fig.10 , Fig.11 and Fig.12As shown, the embedded bin 52 is embedded in the cavity of the outer shell bin 51 from the open end of the outer shell bin 51; the embedded bin 52 includes a fixing strip 521 fixed in the cavity of the outer shell bin 51 and a plurality of airway tubes 522 integrally formed and fixed on the fixing strip 521, the airway tubes 522 are hollow structures, and the plurality of airway tubes 522 are plugged and matched one by one in the inner cavity positions of the plurality of protrusions 513 on the outer shell bin 51; the fixing strip 521 closes the open end of the outer shell bin 51, and the airway tubes 522 are in close contact with the inner wall of the protrusion 513.

[0049] Specifically, Figure 6 , Fig. 9 , Fig.10 , Fig.11 and Fig.12 As shown, an air hole (corresponding to the air hole 522) is provided between the airway tube 522 and the raised portion 513, which can be connected to the air inlet end 53 and introduce external air. Fig.11 and Fig.12 The airway tube 522 and the raised portion 513 are provided with air holes (corresponding to the air holes in the airway tube 522) for discharging the air introduced into the dehumidification chamber. Fig.11 and Fig.12 The long holes in the Fig.11 The long strip hole in the figure refers to the hole located on the raised portion 513; the inner cavity of the outer shell bin 51 is separated by the embedded bin 52 to form an exhaust chamber, and the upper end surface of the outer shell bin 51 is provided with an air hole (corresponding to the Fig.11 The exhaust pipe 512 is connected to the closed end of the outer shell bin 51 away from the opening to discharge the air in the exhaust chamber to the outside. The exhaust pipe 512 is slidably matched with the partition bin 32 and extends to the outside. An electric hydraulic cylinder can be horizontally installed outside the heat insulation cover 3, and the part of the exhaust pipe 512 extending to the outside is fixed to the output end of the electric hydraulic cylinder, thereby driving the dehumidification baffle to slide horizontally. In addition, in order to facilitate the confirmation of whether the air discharged from the dehumidification chamber is in a dry state, in this embodiment, an existing humidity sensor for detecting the humidity of the exhaust air is also installed on the exhaust pipe 512. In order to adapt to use in high temperature environments, the humidity sensor can be an existing ceramic humidity sensor. The air inlet end 53 includes a main air pipe 531, on which an air pipe end 532 is provided and connected to multiple branch air pipes 533. The branch air pipes 533 are connected to corresponding air holes that continuously pass through the closed cover plate 322 and the guide groove plate 323. In order to dehumidify and filter the air introduced from the outside, a dehumidification filter layer is also installed in the air pipe end 532, and the filter layer can be an existing dehumidification filter membrane.

[0050] In the present invention, the exhaust pipe 512 is connected to the vacuum pump through the air pipe. When working, the air intake end 53 and the air intake channel and the exhaust channel in the dehumidification baffle together form a gas circulation channel. Specifically, when the vacuum pump is working, the external air is filtered through the air intake end 53 and then passes through the air holes of the closed cover plate 322, the air holes of the guide groove plate 323 and the circular air holes between the outer shell bin 51 and the air duct tube 522 in sequence to enter the inner cavity of the air duct tube 522, and continues to be discharged from the long strip air holes of the air duct tube 522 to the outside into the dehumidification chamber, while the outer shell bin 51 draws the air in the dehumidification chamber into the exhaust chamber through the air holes distributed between the raised parts 513, and finally discharges it to the outside through the exhaust pipe 512; the air circulation in the dehumidification chamber can be enhanced by the introduction and discharge of air.

[0051] like Figure 3 , Figure 6 , Figure 7 and Fig.13 As shown, in order to facilitate the test material plate to be pressed down and fixed on the adsorption temperature measuring platform 2 in the heat insulation cover 3, two horizontally symmetrically arranged pressure plate bins 311 are provided at the bottom end of the cylindrical cover 31, and pressure plate mechanisms 6 are installed at the two pressure plate bins 311, and the two pressure plate mechanisms 6 are arranged in a one-to-one correspondence with the two dehumidification partitions; the pressure plate mechanism 6 includes a pressure plate 61 and a driving assembly 62, the pressure plate 61 is horizontally slidably installed in the pressure plate bin 311, and the lower end surface of the pressure plate 61 is completely exposed in the pressure plate bin 311 for pressing the upper end surface of the test material plate. The driving assembly 62 includes an articulated seat 621 fixed on the bottom surface of the partition box 321, and two toggle rods 622 are hingedly installed on the articulated seat 621 through the same articulated axis, and a torsion spring (not shown in the figure) is installed on the articulated seat 621 to reset the toggle rods 622; the two toggle rods 622 extend into the compartment of the partition box 321, and the two toggle rods 622 are arranged one by one with the two touch blocks 511 on the corresponding dehumidification partition; the bottom ends of the two toggle rods 622 are welded with guide rods 623, and a sliding plate 624 is installed along the two guide rods 623 to slide together, and the sliding plate 624 is hinged on the pressing plate 61 through two hinge joints. A temperature sensor for detecting the temperature of the upper heating surface of the test material plate is also installed on the pressing plate 61. The temperature sensor used can be consistent with the temperature sensor used in the temperature measuring member 23, and the temperature sensing end of the temperature sensor on the pressing plate 61 is flush with the bottom surface of the pressing plate 61.

[0052] In the present invention, when the two dehumidification baffles are pressed against each other, the pressure plate 61 is completely located in the pressure plate bin 311, and the bottom port of the cylindrical cover 31 is completely open; in addition, when the two dehumidification baffles completely slide away from the heating channel and continue to slide away, the dehumidification baffles drive the pressure plate 61 to slide horizontally into the heating channel through the driving assembly 62.

[0053] It should be noted that the present invention adopts a heating and exhaust method to dehumidify the aerogel test material plate. Generally, the water absorption of non-modified aerogel materials is relatively higher than that of modified aerogel materials, and water vapor is more likely to exist in the microporous pore structure of the aerogel, while the water vapor on the hydrophobic aerogel material is mostly located on the surface or in the macroscopic pore structure; it is relatively difficult to dehumidify the non-modified aerogel material using the unified dehumidification method before testing provided by the present invention, and it may be necessary to increase the dehumidification temperature and time. Therefore, it is preferentially suitable for thermal insulation testing of hydrophobic modified aerogel materials, and is particularly suitable for preliminary testing of aerogel materials used for flame retardant and thermal insulation purposes before thermal stability testing, and is used to quickly verify and evaluate the comprehensive performance of the aerogel products produced, including thermal insulation and thermal stability.

[0054] Before the test, random sampling can be performed in the produced aerogel material to obtain a plurality of circular test material plates slightly smaller than the size of the support groove 211 .

[0055] During the test, the test material board is first subjected to indiscriminate dehumidification and drying treatment through the device, and then the thermal insulation performance test is carried out after dehumidification and drying. The specific test process can be seen as follows.

[0056] Dehumidification and drying stage: first, the heat insulation cover 3 is lowered as a whole, so that the bottom end of the cylindrical cover 31 is just connected and inserted into the sealing retaining ring 213; then, the two dehumidification partitions are slid towards each other until they are close to each other, thereby separating the space area above the heating channel to form a dehumidification chamber. At this time, the entire air path of the two dehumidification partitions is in a connected state. Then, the heating plate 4 is manually opened, and the test material plate is placed on the two dehumidification partitions. At this time, the lower end surface of the test material plate is in contact with the raised portion 513. The purpose of providing the raised portion 513 is to facilitate the air circulation under the test material plate; then, the heating plate 4 is turned on, and the temperature of the heating plate 4 is adjusted to the temperature range required for dehumidification heating, in order to avoid aerogel caused by high-temperature heating during the dehumidification process. The pore structure collapses and deforms, so the heating plate 4 is heated at a relatively low temperature during the dehumidification stage, and the heating temperature is generally less than 100°. In addition, the vacuum pump connected to the dehumidification baffle is turned on simultaneously. During the dehumidification process, the water vapor in the deeper pores in the aerogel can be brought out through auxiliary heating, and the evaporation of water vapor can be promoted. The cooperation of the two dehumidification baffles and the two external air inlet ports 53 can not only achieve uniform dispersion of the airflow, but also enhance air circulation and quickly discharge the water vapor brought out of the test material plate. The humidity sensor on the exhaust pipe 512 can quickly feedback the water vapor content in the exhaust air. When the humidity sensor shows that the exhaust air is basically dry and the humidity state tends to be stable, it can be considered that the test material plate has been fully dehumidified and dried.

[0057] After dehumidification and drying, in order to eliminate the impact of heating during the dehumidification process on subsequent thermal insulation tests, the test material plate needs to be cooled down. During the cooling process, the heating of the heating plate is suspended, while the dehumidification partition continues to circulate air, prompting the test material plate to cool down quickly until the temperature in the dehumidification chamber drops to the same as the external room temperature. In order to facilitate the monitoring of the temperature in the dehumidification chamber, a thermometer can be installed on the heating plate, and the temperature in the dehumidification chamber can be measured by the thermometer.

[0058] Material transfer stage: after the drying and cooling are completed, the two dehumidification partitions slide away from each other in the opposite direction. When the two dehumidification partitions just completely avoid the heating channel, the trigger block 511 just contacts the corresponding toggle rod 622, and the pressure plate 61 is still in the pressure plate bin 311, and the port at the bottom end of the cylindrical cover 31 is also completely open. In the closed heat insulation cover 3, it is not affected by the wind direction of the external ambient airflow. The test material plate naturally falls under the action of gravity and falls into the material support groove 211; as the two dehumidification partitions continue to slide in the opposite direction, the two trigger blocks 511 on the same dehumidification partition synchronously trigger the toggle rod 622, and the toggle rod 622 deflects, driving the sliding plate 624 through the guide rod 623, and then pushing the pressure plate 61 to slide horizontally outward along the pressure plate bin 311 and extend into the heating channel.

[0059] Adsorption and fixation stage: The heat shield 3 continues to descend, and the pressure plate 61 descends synchronously therewith. The two pressure plates 61 slightly press on the test material plate, so that the lower plate surface of the test material plate is in good contact with the groove surface of the support groove 211, so that the five temperature sensing patches 232 are tightly attached to the test material plate. Subsequently, the adsorption plate 22 fixes the test material plate by negative pressure adsorption through the adsorption head 223, and the heat shield 3 rises slightly, so that the pressure plate 61 and the upper plate surface of the test material plate are adjusted from a slightly pressured state to maintain just a close contact. It should be added here that the distance between the bottom end of the cylindrical cover 31 and the inner end face of the support groove 211 is known, and the thickness of the aerogel material used for testing is also known. Therefore, after the aerogel is placed, the descending height of the heat shield 3 can be adjusted accordingly.

[0060] Insulation test stage: while the test material plate is kept in an adsorbed and fixed state, the entire upper end surface of the test material plate is covered and evenly heated by the heating plate 4. The heating temperature of the heating plate 4 can be gradually increased according to the test set temperature range. The multiple temperature sensors on the temperature measuring element 23 can be used to detect the temperature of multiple points on the back temperature surface of the test material plate in real time, and the temperature sensor on the pressing plate 61 can be used to detect the temperature on the heated surface of the test material plate in real time, so that the heating temperature of the heating plate 4, the detection temperature of the pressing plate 61 end and the detection temperature of the temperature measuring element 23 can be generated together with the same The temperature curve of time change can simulate the thermal insulation of the aerogel in a heated environment. The detected temperature at the end of the pressing plate 61 is equivalent to the temperature of the heated environment. By comparing the temperature curves, when the detected temperature at the end of the pressing plate 61 gradually increases, the smaller the increase in the detected temperature of the temperature measuring component 23 is, the better the thermal insulation effect is. When the detected temperature at the end of the pressing plate 61 is at a certain point, the detected temperature of the temperature measuring component 23 begins to increase sharply, which means that when the temperature is higher than this point, the thermal insulation of the tested aerogel is basically invalid, and it is used as the critical temperature of thermal insulation failure of the test material plate.

[0061] After the test is completed, the heat shield 3 can be lifted up, and the adsorption plate 22 can be released, and then the tested test material plate can be taken out from the support base.

[0062] Repeated testing of multiple material plates: In order to eliminate random errors in the testing process, multiple selected test material plates can be individually and repeatedly tested according to the above test operation process, and the test data of each test material plate can be recorded. The actual thermal insulation performance of the produced aerogel can be comprehensively analyzed based on multiple sets of test data. If the thermal insulation performance meets the performance standard, the batch of materials can be subjected to subsequent related tests on thermal stability. If the performance standard is not met, the production process needs to be adjusted to meet the material performance requirements.

[0063] The present invention provides an aerogel thermal stability testing device, which uses a thermal insulation test as a preliminary test of a thermal stability test to indirectly evaluate the thermal stability state of the aerogel, changes the open test method used in the existing thermal insulation test, and realizes multiple isolations between the test environment and the surrounding environment through the cooperation of an adsorption temperature measuring platform 2 and a heat insulation cover 3, thereby ensuring the uniformity and stability of the test environment, avoiding the influence of multiple environmental variables such as the temperature, humidity, wind force of the surrounding environment, and air convection after heating on the test during the open test, the adsorption temperature measuring platform 2 can be used to test and fix the test material plate, and the test material plate of the same size can be placed in a limited position, and the heating plate 4 is used to perform temperature-adjustable full-coverage uniform heating on the test material plate, and in a closed and heatable test space, The integrated installation is provided with a partition mechanism 5 which can form a dehumidification chamber, and before the test, an indiscriminate dehumidification treatment can be performed in a unified and closed test space. The dehumidification process is simple and easy to operate, and the effect of the actual thermal insulation effect on the thermal conductivity of the aerogel caused by humidity can be eliminated. In addition, a pressing plate mechanism 6 is provided in conjunction with the partition mechanism 5, and the temperature measuring point bonding on the upper and lower end surfaces of the test material plate can be completed in conjunction with the adsorption temperature measuring platform 2. In summary, the device provided by the present invention can perform preliminary thermal insulation tests on the thermal stability of aerogels in a relatively unified, closed and controllable test space, and can perform indiscriminate rapid dehumidification treatment on the test material plate before the test, eliminating the influence of multiple variables such as the surrounding environment and the humidity of the material itself on the test, thereby improving the accuracy and authenticity of the test results and facilitating objective and accurate performance judgment.

[0064] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0065] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0066] The above describes the preferred embodiments of the present invention. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and the devices and structures that are not described in detail should be understood to be implemented in a common manner in the art; any technician familiar with the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify them into equivalent embodiments with equivalent changes, which does not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of protection of the technical solution of the present invention.

Claims

1. An aerogel thermal stability testing device, characterized in that: include: An adsorption temperature measuring platform, used for adsorption, fixation and temperature measurement of the lower end surface of the aerogel test plate; The heat insulation cover is arranged to be lifted and lowered just above the adsorption temperature measuring platform, and when descending, its bottom end can form a closed connection with the adsorption temperature measuring platform, and a vertical downward heating channel is arranged inside; A heating plate is hingedly closed at the top open end of the heating channel of the heat insulation cover and heats the upper end surface of the test material plate through the heating channel; The partition mechanism includes two dehumidification partitions that are horizontally relatively slidably arranged in the heat insulation cover, and the two dehumidification partitions can separate the heating channel area located above to form a dehumidification chamber; the dehumidification partition is provided with an air intake channel and an exhaust channel connected to the dehumidification chamber; when the dehumidification partition completely separates or completely opens the heating channel, the two channels are correspondingly opened or closed; before the test, the test material plate is dehumidified indiscriminately in a unified closed test space to eliminate the influence of the surrounding environment and the humidity of the material itself on the test; and two pressing plate mechanisms, which are arranged in a one-to-one correspondence with the two dehumidification baffles; the pressing plate mechanism comprises a pressing plate horizontally slidably mounted at the bottom of the heat insulation cover and used for pressing the test material plate, and a driving assembly connected to the pressing plate and extending into the heat insulation cover; in the process of the two dehumidification baffles completely sliding away from the heating channel and continuing to move away, the dehumidification baffles drive the pressing plate to extend into the heating channel through the driving assembly; The heat insulation cover comprises a cylindrical cover and a partition bin, wherein the partition bin is horizontally fixed on the top of the cylindrical cover; the two dehumidification partitions are horizontally slidably installed in the partition bin; The dehumidification partition includes: an outer shell bin, which is a hollow shell structure, horizontally slidably installed in the partition bin, and the two ends of the outer shell bin in the sliding direction are respectively closed and open; the upper end surface of the outer shell bin is provided with a plurality of protrusions, and the protrusions extend along the sliding direction of the outer shell bin; the protrusions facilitate the air circulation under the test material plate.

2. The aerogel thermal stability testing device according to claim 1, characterized in that: The outside of the heat insulation cover is provided with two air inlet ends that can pass the external air into the air inlet channels of the two dehumidification partitions one by one; when the heating channel is completely separated by the two dehumidification partitions, the air inlet end and the corresponding air inlet channels in the dehumidification partition are in a docking and connecting state, and when the two dehumidification partitions completely avoid the heating channel, the air inlet end and the corresponding air inlet channels in the dehumidification partition are in a staggered and disconnected state.

3. The aerogel thermal stability testing device according to claim 1, characterized in that: The adsorption temperature measuring platform comprises: The material support base is used to place the test material plate horizontally; The adsorption plate is installed on the support base and is used for pneumatically adsorbing and fixing the lower end surface of the test material plate; and a plurality of temperature measuring components, all of which are vertically elastically connected to the upper end surface of the adsorption plate and vertically pass through the supporting surface of the support base; When the test material plate is adsorbed and fixed on the supporting surface of the support base, the temperature sensing end of the temperature measuring component is elastically pressed against the lower end surface of the test material plate.

4. The aerogel thermal stability testing device according to claim 2, characterized in that: The heat insulation cover also includes two horizontally symmetrically arranged pressure plate bins at the bottom of the cylindrical cover, and the two pressure plate mechanisms are assembled at the two pressure plate bins one by one. The pressure plate is horizontally slidably installed in the pressure plate bin, and the lower end surface of the pressure plate is completely exposed in the pressure plate bin; And the hinge seat cylinder is coaxially arranged with the cylinder cover and fixed at the top end of the partition bin; the heating plate is hinged and closed at the top end port of the hinge seat cylinder; the partition bin is respectively connected with the hinge seat cylinder and the cylinder cover above and below and together constitutes a heating channel.

5. The aerogel thermal stability testing device according to claim 4, characterized in that: The dehumidification baffle also includes an embedded bin, which is embedded in the cavity of the outer shell bin from the open end of the outer shell bin; the embedded bin includes a fixing strip fixed in the cavity of the outer shell bin and a plurality of airway tubes fixed on the fixing strip, the airway tubes are hollow structures, and the plurality of airway tubes are plugged and matched in a one-to-one correspondence with the inner cavity positions of the plurality of protrusions on the outer shell bin; Corresponding air holes are provided between the airway tube and the raised portion, which can be connected with the air inlet end and introduce external air. Corresponding air holes are also provided between the airway tube and the raised portion, which discharge the air introduced into the airway tube into the dehumidification chamber. The inner cavity of the outer shell warehouse is divided by the embedded warehouse to form an exhaust chamber. The upper end surface of the outer shell warehouse is provided with air holes for passing the air in the dehumidification chamber into the exhaust chamber. The closed end of the outer shell warehouse away from the opening is connected with an exhaust pipe for discharging the air in the exhaust chamber to the outside, and the exhaust pipe extends from the interior of the partition warehouse to the outside.

6. The aerogel thermal stability testing device according to claim 5, characterized in that: The partition warehouse comprises: The partition box is a rectangular box structure, with the bottom penetrating and fixed on the top of the cylindrical cover; The closed cover is sealed and fixed on the top of the partition box, and the bottom end of the hinge seat cylinder is fixed on the upper end surface of the closed cover; And a guide groove plate, which is fixed on the bottom end surface of the closed cover plate and embedded in the bin of the partition box, and the bottom end surface of the guide groove plate is provided with a profile guide groove that slides and fits with the upper end surface of the outer shell bin; the air inlet end is fixed on the upper end surface of the closed cover plate, and air holes that connect the air inlet end with the air inlet channel are correspondingly provided between the closed cover plate and the guide groove plate.

7. The aerogel thermal stability testing device according to claim 6, characterized in that: A trigger block is fixed on both sides of the outer wall of the housing bin at a level perpendicular to the sliding direction thereof, and the trigger block is slidably fitted with the profile guide groove of the guide groove plate; The drive assembly comprises: A hinged seat, fixed on the bottom end surface of the partition box; The two toggle rods are hinged on the hinge seat through the same hinge shaft, and a torsion spring is installed on the hinge seat to reset the toggle rods; the two toggle rods extend into the compartment of the partition box, and the two toggle rods are aligned with the two touch blocks on the corresponding dehumidification partitions; Two guide rods are fixedly connected to the bottom ends of the two toggle rods in a one-to-one correspondence; and a sliding plate, slidably mounted on the two guide rods and hinged on the pressure plate; When the two dehumidification partitions slide away from each other, the trigger block triggers the toggle rod, so that the driving assembly pushes the pressing plate to slide from the pressing plate bin into the cylinder of the cylindrical cover.

8. The aerogel thermal stability testing device according to claim 3, characterized in that: The upper end surface of the material supporting base is provided with a material supporting groove for placing the test material plate in a limited position; the bottom end of the material supporting base is provided with a heat insulating retaining ring aligned with the material supporting groove; the adsorption plate is embedded and installed in the heat insulating retaining ring; a clamping support ring is also threadedly rotatably installed in the heat insulating retaining ring, and the adsorption plate is clamped up and down between the bottom end surface of the material supporting groove and the upper end surface of the clamping support ring; the adsorption plate is provided with a plurality of adsorption heads vertically passing through the material supporting groove, and the top end of the adsorption head is flush with the upper end surface of the material supporting groove.

9. The aerogel thermal stability testing device according to claim 5, characterized in that: A filter layer for dehumidifying the external air is arranged in the air passage at the air inlet end; and a humidity sensor for detecting the humidity of the exhaust air is mounted on the exhaust pipe.

10. The aerogel thermal stability testing device according to claim 1, characterized in that: The pressing plate is provided with a temperature sensor for detecting the temperature of the upper heating surface of the test material plate.

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