CN115541651A - A thermal insulation material use temperature evaluation and performance testing system - Google Patents

Abstract

The invention provides a system for evaluating the use temperature and testing the performance of a heat insulating material, which comprises a test bench, a temperature measuring component and a temperature control component, wherein the temperature measuring component is arranged on the test bench; the test bench comprises a support (11), a heat insulation bottom plate (12), a test groove (13), a heat preservation furnace lining (14) and a protective cover (15); the temperature measuring component comprises a first hot-surface thermocouple (21), a first cold-surface thermocouple (22) and an interlayer thermal resistor (23); the temperature control assembly comprises a heating element (31), a second hot-surface thermocouple (32), a second cold-surface thermocouple (33) and an intelligent temperature control meter. The system can complete the test of the heat insulation performance of the heat insulation material in the evaluation process of the maximum use temperature of the heat insulation material, thereby reducing the test time and improving the evaluation efficiency; meanwhile, the system has the advantages of high testing precision, small error and good performance evaluation accuracy.

Description

A thermal insulation material use temperature evaluation and performance testing system

technical field

The invention relates to the technical field of temperature testing, in particular to a thermal insulation material use temperature evaluation and performance testing system.

Background technique

Insulation material refers to the material that can block the transfer of heat flow. It is mainly used to prevent the heat of the hot-end parts from being transferred to the cold-end, causing the temperature of the cold-end parts to rise. It is widely used in many fields such as weaponry, aerospace, and construction industries. .

The service temperature of thermal insulation materials, especially the maximum service temperature, is one of the key parameters for judging the performance of thermal insulation materials. Effective, accurate and rapid evaluation of the maximum service temperature of thermal insulation materials is conducive to the further development of thermal insulation materials. At present, the highest service temperature evaluation method for thermal insulation materials is to place the sample under simulated test conditions close to the service state for a specified period of time, and then test the relevant performance of the sample after the sample, that is, the thermal insulation performance. This process needs to be carried out step by step. , the test period is long, and the performance test efficiency is low; at the same time, the existing test methods have problems such as poor sample temperature test uniformity, low temperature test accuracy, and poor performance evaluation accuracy.

Contents of the invention

In view of the problems existing in the prior art above, the purpose of the present invention is to provide a thermal insulation material service temperature evaluation and performance testing system, which can complete the thermal insulation performance test of the thermal insulation material during the evaluation process of the maximum service temperature of the thermal insulation material, Therefore, the test time is reduced and the evaluation efficiency is improved; at the same time, the system has the advantages of high test accuracy, small error, and good performance evaluation accuracy.

The object of the present invention is achieved through the following technical solutions:

A thermal insulation material use temperature evaluation and performance testing system, characterized in that it includes a test bench, a temperature measurement component and a temperature control component; the test bench includes a bracket, a heat insulation bottom plate, a test tank, a heat insulation furnace The bottom plate is set on the bracket and the test tank is set on the heat insulation bottom plate. The inner wall of the test tank and the upper surface of the heat insulation bottom plate are covered with the heat preservation furnace lining, and the top of the heat preservation furnace lining is set as a stepped structure recessed to the middle, which is used to install the sample and the protective cover. One end is rotatably connected to one side of the test tank; the temperature measurement component includes the first hot-surface thermocouple, the first cold-surface thermocouple and the interlayer thermal resistance, and the first hot-surface thermocouple is evenly arranged on the heat-insulating furnace lining on the heat-insulating bottom plate side and its bottom end sequentially through the insulation furnace lining, heat insulation bottom plate and support, located outside the support, the first cold surface thermocouple is set on the side of the sample away from the first hot surface thermocouple and the first cold surface thermocouple and the second Corresponding to a hot surface thermocouple, the interlayer thermal resistance is evenly distributed between each layer of the sample; the temperature control component includes a heating element, a second hot surface thermocouple, a second cold surface thermocouple and an intelligent temperature control meter, and the heating element is set On both sides of the test tank and its heating end is located in the insulation furnace lining, and the control end is located outside the test tank, the second hot-side thermocouple corresponds to the first hot-side thermocouple and is misplaced, and the second cold-side thermocouple is aligned with the first cold-side thermocouple. The thermocouples are correspondingly and misplaced, and the second cold surface thermocouple is correspondingly arranged with the second hot surface thermocouple.

For further optimization, the intelligent temperature control meter is arranged outside the test tank and is electrically connected to the second thermocouple on the hot surface, the second thermocouple on the cold surface, and the heating element respectively.

For further optimization, the thickness of the insulation furnace lining is not less than 75mm.

For further optimization, the protective cover is a ventilation protective cover, on which a plurality of ventilation openings are evenly opened.

For further optimization, the top ends of the first thermal surface thermocouple and the second thermal surface thermocouple are both set in a spherical shape, and the bottom end of the sample is correspondingly provided with a spherical groove.

For further optimization, the first cold-surface thermocouple and the second cold-surface thermocouple are patch-type thermocouples.

For further optimization, the interlayer thermal resistance is a sheet thermal resistance, the thickness of which is not more than 0.5mm.

For further optimization, the heating element is arranged parallel to the sample and the heating element is arranged in an area 100-300 mm below the middle position of the sample.

For further optimization, a heating ventilation shield is arranged outside the heating element.

A method for temperature evaluation and performance testing of thermal insulation materials, using the above-mentioned system, characterized in that it includes the following steps:

Step 1: First, set the samples in layers, and then set prefabricated grooves on the top surface of each layer of samples according to the dot matrix arrangement of interlayer thermal resistance, and do not set prefabricated grooves on the top surface of the topmost sample; then , followed by the interlayer thermal resistance installed in the prefabricated groove - the two-layer sample contact bonding - the interlayer thermal resistance installed in the prefabricated groove - the two-layer sample contact bonding cycle process, until the specified number of layers of testing is completed. kind of compound;

Step 2: According to the dot matrix distribution of the first thermal surface thermocouple and the second thermal surface thermocouple on the bottom surface, a spherical groove is correspondingly opened on the bottom surface of the bottom sample; The concave surface of the furnace lining is contacted and fitted, and the spherical groove is clamped with the corresponding hot surface thermocouple;

Step 3: arrange the corresponding first cold surface thermocouple and the second cold surface thermocouple on the top surface of the sample; then close the protective cover;

Step 4: Start the heating element, and adjust the power of the heating element through the real-time feedback of the second hot surface thermocouple and the second cold surface thermocouple; The temperature data of the surface thermocouple and the interlayer thermal resistance are used to complete the heat insulation performance test of the sample and the evaluation of the maximum service temperature.

For further optimization, in the first step, the prefabricated groove is pressed and formed through a sheet-like imitation mold; the interlayer thermal resistance is installed in the prefabricated groove through a profile.

For further optimization, in the second step, an aluminum silicate felt insulation material layer is also used to fill the gap between the edge of the sample and the insulation furnace lining to avoid heat spillage and loss.

For further optimization, in the process of collecting temperature data in the step 4, an environmental collection thermocouple is also set in the area 1m away from the heating element for collecting the ambient temperature.

The present invention has following technical effect:

In this application, through the bonding of the first spherical thermocouple, the second thermocouple and the spherical groove, the first is to realize the multi-point clamping and positioning of the sample after placement, and to avoid the external force during installation and testing. The deviation of the sample caused by or other factors leads to inconsistent test positions of thermocouples in different test periods and differences in test results. Close fit to ensure the accuracy of test results and avoid the influence of air gap, environment and other factors. At the same time, the arrangement of hot-surface thermocouples, cold-surface thermocouples, and interlayer thermal resistances in the lattice distribution of this application is to ensure that the temperature measurement component and the temperature control component do not affect each other, and the second is to ensure the uniformity of the temperature test; The correspondence between the first hot surface thermocouple and the first cold surface thermocouple, the second hot surface thermocouple and the second cold surface thermocouple ensures the accuracy of temperature measurement and temperature control, and avoids the temperature difference between the hot surface and the cold surface. Different test points cause errors; through the setting of interlayer thermal resistance, the temperature test inside the sample can be realized, which is conducive to evaluating the overall heat insulation performance and maximum service temperature of the test sample, ensuring the accuracy of the results.

The test temperature range of this application is wide, and it can be tested from room temperature to 1500°C. The evaluation of the temperature is used to greatly shorten the test time, improve the performance test efficiency, reduce the energy consumption of the performance test, and reduce the test cost.

Description of drawings

Fig. 1 is a schematic diagram of the front structure of the temperature evaluation and performance testing system used in the embodiment of the present invention.

Fig. 2 is a schematic side view of the temperature evaluation and performance testing system used in the embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a sample of the system in an embodiment of the present invention.

Fig. 4 is a view from direction A in Fig. 3 .

Fig. 5 is a view from direction B in Fig. 3 .

Fig. 6 is a sectional view taken along line C-C of Fig. 3 .

Among them, 11. bracket; 12. heat insulation bottom plate; 13. test tank; 14. insulation furnace lining; 15. protective cover; 151. vent; 152. handle; Surface thermocouple; 23. Interlayer thermal resistance; 31. Heating element; 310. Heating ventilation shield; 32. The second hot surface thermocouple; 33. The second cold surface thermocouple; 40. Sample; 400. Silicic acid Aluminum felt insulation material layer; 41, spherical groove.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.

Example 1:

As shown in Figures 1 to 6: a thermal insulation material service temperature evaluation and performance testing system, characterized in that it includes a test bench, a temperature measurement component and a temperature control component; the test bench includes a bracket 11, a heat insulation bottom plate 12, a test Groove 13, insulation bottom plate 14 and protective cover 15, heat insulation base plate 12 is arranged on support 11 and test groove 13 is arranged on heat insulation base plate 12, test groove 13 inner wall and heat insulation base plate 12 upper surface cover insulation furnace lining 14 and insulation furnace lining The top of 14 is set as a stepped structure recessed toward the middle (as shown in Figure 1 and Figure 2, that is, the height of the insulation lining 14 close to the inside of the test tank 13 is lower than the height of the insulation furnace lining 14 away from the inside of the test tank 13), for installation For sample 40, the thickness of the heat preservation furnace lining 14 is not less than 75mm and the thickness of the side wall heat preservation furnace lining 14 is consistent. One end of the protective cover 15 is rotatably connected to one side of the test tank 13, and a fixed clip can be provided on the other side to realize a fixed and sealed connection (the fixed clip is specifically marked in the figure, and a common fixed clip structure in the field can be used); the protective cover 15 It is a ventilation protective cover, on which a plurality of ventilation openings 151 are evenly opened, and meanwhile, a handle 152 is arranged on the protective cover 15 for opening the protective cover 15 .

The temperature measurement assembly includes a first hot surface thermocouple 21, a first cold surface thermocouple 22 and an interlayer thermal resistance 23. The first hot surface thermocouple 21 is evenly arranged on the upper side of the insulation furnace lining 14 on the heat insulation bottom plate 12 and its bottom The end runs through the insulation furnace lining 14, the heat insulation bottom plate 12 and the support 11 in turn, and is located outside the support 11. The first cold surface thermocouple 22 is arranged on the side of the sample 40 away from the first hot surface thermocouple 21 and the first cold surface thermocouple The couple 22 corresponds to the first thermocouple 21 on the hot surface, and the interlayer thermal resistance 23 is evenly distributed between each layer of the sample 40; the temperature control assembly includes a heating element 31, a second thermocouple 32 on the hot surface, and a second thermocouple on the cold surface. 33 and an intelligent temperature control meter, the heating element 31 is arranged on both sides of the test tank 13 and its heating end is located in the insulation furnace lining 14, the control end is located outside the test tank 13, the second hot surface thermocouple 32 and the first hot surface thermocouple 21 Corresponding and misplaced settings (that is, the second thermal surface thermocouple 32 and the first thermal surface thermocouple 21 are arranged on the same plane and their shapes and sizes are consistent, but their specific setting points are misaligned and do not interfere with each other), the second The cold surface thermocouple 33 corresponds to the first cold surface thermocouple 22 and is misplaced (that is, the second cold surface thermocouple 33 is arranged on the same plane as the first cold surface thermocouple 22 and their shapes and sizes are consistent, but their specific settings The points are misplaced and do not interfere with each other), and the second cold-side thermocouple 33 is set corresponding to the second hot-side thermocouple 32 (that is, the number of the second cold-side thermocouple 33 is consistent with the number of the second hot-side thermocouple 32 ), the intelligent temperature control meter is set outside the test tank 13 and is electrically connected to the second hot-surface thermocouple 32, the second cold-surface thermocouple 33, and the heating element 31, respectively.

The top ends of the first hot-surface thermocouple 21 and the second hot-surface thermocouple 32 are all arranged in a spherical shape, and the bottom end of the sample 40 is correspondingly provided with a spherical groove 41; the first cold-surface thermocouple 22 and the second cold-surface thermocouple The couple 33 is a chip type thermocouple; the interlayer thermal resistance 23 is a chip type thermal resistance, and its thickness does not exceed 0.5mm.

The dot matrix arrangement of each thermocouple or thermal resistance is shown in Figures 4-6, wherein the number of the first thermocouples 21 on the hot surface is less than the number of the second thermocouples 32, that is, the number of thermocouples 22 on the first cold surface. The number is less than the number of the second cold surface thermocouples 33 . As shown in Figure 4 and Figure 5: the first hot surface thermocouple 21 and the first cold surface thermocouple 22 are evenly distributed on the diagonal of the sample 40, the second hot surface thermocouple 32 and the second cold surface thermocouple 33 are evenly distributed on the diagonal and two midlines of the sample, and the second hot-surface thermocouple 32 located on the diagonal 32 is misaligned with the first hot-surface thermocouple 21 on the same surface; as shown in Figure 6: The interlayer thermal resistances 23 are evenly distributed on the two midlines of the same layer of the sample 40 .

The heating element 31 is arranged parallel to the sample 40 and the heating element 31 is arranged in the area 100-300 mm below the middle position of the sample 40 (combined with Fig. 1 and Fig. 2); The heat dissipation of the heating element 31 is ensured.

Example 2:

A method for temperature evaluation and performance testing of thermal insulation materials, using the system described in Example 1, characterized in that it includes the following steps:

Step 1: First, set the sample 40 in layers, and keep the thickness of each layer of the sample 40 consistent, that is, select a sample of the same material with multiple layers of thickness and size that is thinner in thickness; The top surface of 40 is provided with prefabricated grooves according to the dot matrix arrangement of the interlayer thermal resistance 23 described in Embodiment 1, and the top surface of the topmost sample 40 is not provided with prefabricated grooves; the setting method of the prefabricated grooves is specifically: through the sheet shape imitation mold to carry out the compression molding of the prefabricated groove; then, the interlayer thermal resistance 23 is installed in the prefabricated groove in sequence-the two-layer sample 40 is contacted and bonded-the interlayer thermal resistance 23 is installed in the prefabricated groove-two layers The sample 40 is contacted with the cyclic process of bonding until the compounding of the specified number of layers of the sample 40 is completed (as shown in Figure 3, this embodiment is the compounding of the three-layer sample 40); the interlayer thermal resistance 23 is installed on the In the prefabricated groove, the contact bonding between the two layers of samples 40 may use adhesives, or may be directly pressed and bonded, or other fastening and bonding methods may also be used.

Step 2: According to the lattice distribution of the first hot surface thermocouple 21 and the second hot surface thermocouple 32 on the bottom surface (that is, the insulation furnace lining 14 of the heat insulation bottom plate 12) (refer to the above-mentioned embodiment 1 for the specific lattice distribution) in The bottom surface of the lowermost sample 40 corresponds to a spherical groove 41; then place the sample 40 so that the bottom surface of both ends of the sample 40 is in contact with the concave surface of the insulation furnace lining 14 (as shown in Figure 1), and the spherical groove 41 and the corresponding The hot-surface thermocouple (clamping means that the spherical heads of the first thermal-surface thermocouple 21 and the second thermal-surface thermocouple 32 are correspondingly embedded in the spherical groove 41); at the same time, the aluminum silicate felt insulation material layer 400 Fill the gap between the edge of the sample 40 and the insulation furnace lining 14 to avoid heat spillage and loss. As shown in Figures 1 and 2, the thickness of the aluminum silicate felt insulation material layer 400 is not less than 200mm.

Step 3: arrange the corresponding first cold surface thermocouple 22 and the second cold surface thermocouple 33 on the top surface of the sample 40 (their lattice distribution refers to that described in Example 1); then close the protective cover 15;

Step 4: start the heating element 31, and adjust the power of the heating element 31 through the real-time feedback of the second hot surface thermocouple 32 and the second cold surface thermocouple 33; 21. The temperature data of the first cold surface thermocouple 22 and the interlayer thermal resistance 23 are used to complete the heat insulation performance test and the highest service temperature evaluation of the sample; during the process of collecting temperature data, it is also set in an area 1m away from the heating element 32 An environmental collection thermocouple (the specific setting position of the environmental collection thermocouple is not shown in the figure, and those skilled in the art can understand it), used to collect the ambient temperature.

Among them, the ranges of the first hot-side thermocouple 21, the first cold-side thermocouple 22, the interlayer thermal resistance 23, the second hot-side thermocouple 32, and the second cold-side thermocouple 33 are all from 0 to 1500°C, and the accuracy is ±0.01°C; the range of the intelligent temperature control meter is 0~1500°C, the accuracy is ±0.1°C; the maximum working temperature of the heating element 31 is 1500°C, the maximum heating rate should not be less than 50°C/min, and the heating error should not be greater than 5% or 15°C.

It will be apparent to those skilled in the art that the invention is not limited to the details of the above-described exemplary embodiments, but that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Accordingly, the embodiments should be regarded in all points of view as exemplary and not restrictive, the scope of the invention being defined by the appended claims rather than the foregoing description, and it is therefore intended that the scope of the invention be defined by the appended claims rather than by the foregoing description. All changes within the meaning and range of equivalents of the elements are embraced in the present invention. Any reference sign in a claim should not be construed as limiting the claim concerned. In addition, it should be understood that although this specification is described according to implementation modes, not each implementation mode only contains an independent technical solution, and this description in the specification is only for clarity, and those skilled in the art should take the specification as a whole , the technical solutions in the various embodiments can also be properly combined to form other implementations that can be understood by those skilled in the art.

Claims (9)

1. A thermal insulation material service temperature evaluation and performance testing system, characterized in that: it includes a test bench, a temperature measurement component and a temperature control component; the test bench includes a bracket, a heat insulation bottom plate, a test tank, a heat preservation furnace lining and a protective cover, The heat insulation bottom plate is set on the bracket and the test tank is set on the heat insulation bottom plate. The inner wall of the test tank and the upper surface of the heat insulation bottom plate are covered with the insulation furnace lining, and the top of the insulation furnace lining is set as a stepped structure recessed toward the middle, which is used to install the sample. One end of the protective cover is rotatably connected to one side of the test tank; the temperature measurement component includes the first hot-side thermocouple, the first cold-side thermocouple and the interlayer thermal resistance, and the first hot-side thermocouple is evenly arranged on the heat insulation bottom plate. The upper side of the furnace lining and its bottom end run through the insulation furnace lining, the heat insulation bottom plate and the support in sequence, and are located outside the support. The first cold surface thermocouple is set on the side of the sample away from the first hot surface thermocouple and the first cold surface thermocouple Corresponding to the first hot surface thermocouple, the interlayer thermal resistance is evenly distributed between each layer of the sample; the temperature control component includes a heating element, a second hot surface thermocouple, a second cold surface thermocouple and an intelligent temperature control meter. The elements are arranged on both sides of the test tank with the heating end inside the holding furnace lining and the control end outside the test tank. The second hot-side thermocouple corresponds to the first hot-side thermocouple and is misplaced. The second cold-side thermocouple is aligned with the first The thermocouples on the cold surface correspond to and are arranged in dislocation, and the thermocouples on the second cold surface and the second thermocouples on the hot surface are arranged correspondingly. 2. A heat insulation material service temperature evaluation and performance testing system according to claim 1, characterized in that: the protective cover is a ventilation protective cover, and a plurality of ventilation openings are evenly opened on it. 3. A thermal insulation material service temperature evaluation and performance testing system according to claim 1 or 2, characterized in that: the top ends of the first thermal surface thermocouple and the second thermal surface thermocouple are both set in a spherical shape , the bottom of the sample corresponds to a spherical groove. 4 . A thermal insulation material service temperature evaluation and performance testing system according to claims 1 to 3 , wherein the first cold-surface thermocouple and the second cold-surface thermocouple are chip-type thermocouples. 5. A thermal insulation material service temperature evaluation and performance testing system according to claims 1-4, characterized in that: the interlayer thermal resistance is a sheet thermal resistance, and its thickness does not exceed 0.5 mm. 6. A heat insulation material service temperature evaluation and performance testing system according to claim 1, characterized in that: a heating and ventilation shield is arranged outside the heating element. 7. According to claim 3, a method for using a thermal insulation material service temperature evaluation and performance testing system, characterized in that: comprising the following steps: Step 1: First, set the samples in layers, and then set prefabricated grooves on the top surface of each layer of samples according to the dot matrix arrangement of interlayer thermal resistance, and do not set prefabricated grooves on the top surface of the topmost sample; then , followed by the interlayer thermal resistance installed in the prefabricated groove - the two-layer sample contact bonding - the interlayer thermal resistance installed in the prefabricated groove - the two-layer sample contact bonding cycle process, until the specified number of layers of testing is completed. kind of compound; Step 2: According to the dot matrix distribution of the first thermal surface thermocouple and the second thermal surface thermocouple on the bottom surface, a spherical groove is correspondingly opened on the bottom surface of the bottom sample; The concave surface of the furnace lining is contacted and fitted, and the spherical groove is clamped with the corresponding hot surface thermocouple; Step 3: arrange the corresponding first cold surface thermocouple and the second cold surface thermocouple on the top surface of the sample; then close the protective cover; Step 4: Start the heating element, and adjust the power of the heating element through the real-time feedback of the second hot surface thermocouple and the second cold surface thermocouple; The temperature data of the surface thermocouple and the interlayer thermal resistance are used to complete the heat insulation performance test of the sample and the evaluation of the maximum service temperature. 8. According to claim 7, a method for evaluating the service temperature of thermal insulation materials and using a performance testing system is characterized in that: in said step 1, the prefabricated grooves are pressed and formed through a sheet-shaped imitation mold; the interlayer thermal resistance is passed through The profile is installed in the prefabricated groove. 9. According to claim 7, a method for using a thermal insulation material service temperature evaluation and performance testing system, characterized in that: in the process of collecting temperature data in the step 4, an environment is set in an area 1m away from the heating element Collect thermocouples.

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