CN113390920B - Method for testing performance of heat-insulating material - Google Patents
Method for testing performance of heat-insulating material Download PDFInfo
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- CN113390920B CN113390920B CN202110712886.2A CN202110712886A CN113390920B CN 113390920 B CN113390920 B CN 113390920B CN 202110712886 A CN202110712886 A CN 202110712886A CN 113390920 B CN113390920 B CN 113390920B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/202—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material using mass spectrometer detection systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
- G01M3/226—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators for containers, e.g. radiators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/14—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N7/00—Analysing materials by measuring the pressure or volume of a gas or vapour
- G01N7/14—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference
- G01N7/16—Analysing materials by measuring the pressure or volume of a gas or vapour by allowing the material to emit a gas or vapour, e.g. water vapour, and measuring a pressure or volume difference by heating the material
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Abstract
A device and a method for testing the performance of a heat-insulating material belong to the field of low-temperature containers and equipment. The device comprises a vibration platform and a detection cylinder body arranged on the vibration platform, wherein an inner container with the outer surface used for winding a heat insulation material to be detected is arranged in the detection cylinder body, and a chamber used for filling media simulating different working conditions is arranged in the inner container; the detection cylinder body is provided with a medium inlet and a medium outlet which are communicated with the cavity of the inner container, and the detection cylinder body is provided with a nitrogen replacement port, a vacuum degree detection port and a vacuum pumping port which are communicated with the inner cavity of the detection cylinder body; the inspection method comprises an operation flow for inspecting the performance of the thermal insulation paper material, an inspection method of the thermal insulation paper material at different temperatures and an inspection method of the thermal insulation paper material at different states. The device can be used for testing the performances of the heat-insulating material, such as the air release rate, the static evaporation rate and the like, and solves the problem that the appearance and the package of the heat-insulating material can only be tested and the performance of the heat-insulating material cannot be tested when a user carries out incoming material testing on the heat-insulating material.
Description
Technical Field
The invention relates to the field of low-temperature containers and equipment, in particular to a method for testing the performance of a heat-insulating material.
Background
Cryogenic equipment industry vessels are typically 2-layer or multi-layer structures with a separation gap often using vacuum powder insulation or high vacuum multi-layer insulation. The high vacuum multi-layer heat-insulating material is commonly heat-insulating paper, heat-insulating quilt and the like, the quality of the properties such as air release rate, static evaporation rate and the like has important influence on the heat-insulating properties such as vacuum degree, maintenance time and the like of a low-temperature container, and the air release rate is not more than 8 multiplied by 10 according to the national GB/T31480 (high vacuum multi-layer heat-insulating material for deep cooling container) standard requirement at present ﹣7 Pa·m³/s·g。
At present, when a user unit inspects the incoming materials of the heat-insulating material, only the appearance and the packaging condition of the heat-insulating material can be inspected, but the performance of the heat-insulating material cannot be inspected, and whether the performance meets the relevant standard requirements only depends on the certification provided by a supplier.
Disclosure of Invention
The invention aims to provide a thermal insulation material performance testing device and a testing method which can test the performance of the thermal insulation material such as the air release rate, the maintaining time and the like aiming at the defects of the prior art.
The invention aims to solve the technical problem by adopting the following technical scheme, and the device for testing the performance of the heat-insulating material is characterized by comprising a vibration platform and a detection cylinder body arranged on the vibration platform, wherein an inner container with the outer surface used for winding the heat-insulating material to be tested is arranged in the detection cylinder body, the inner container is suspended in an inner cavity of the detection cylinder body through a hanging strip, and a cavity used for filling media simulating different working conditions is arranged in the inner container;
the detection cylinder is provided with a medium inlet and a medium outlet which are communicated with the chamber of the inner container through a hose;
the detection cylinder body is provided with a nitrogen replacement port, a vacuum degree detection port, a composite vacuum gauge interface and a vacuum pumping port which are communicated with the inner cavity of the detection cylinder body;
the detection cylinder is provided with a temperature sensor and a pressure sensor which are used for detecting the temperature and the pressure of the inner container.
The technical problem to be solved by the invention can be further realized by the following technical scheme that an end cover connected with the detection cylinder body through a fastening device is arranged at the top of the detection cylinder body, and the medium inlet, the medium outlet, the temperature sensor and the pressure sensor are all arranged at the top of the end cover.
The technical problem to be solved by the invention can be further realized by the following technical scheme that the end cover is also provided with a sight glass and a lifting lug which can observe the internal condition of the inner cavity, and the inner container is suspended in the detection cylinder body through a hanging strip connected with the lifting lug.
The technical problem to be solved by the invention can be further realized by the following technical scheme that a reserved interface communicated with the inner cavity of the detection cylinder body is arranged on the detection cylinder body, and a valve is arranged at the reserved interface.
The technical problem to be solved by the invention can be further realized by the following technical scheme that a bottom cover is arranged at the bottom of the detection barrel, a sewage draining outlet is arranged at the center of the bottom cover, and a support rod is arranged between the bottom cover and the vibration platform.
The technical problem to be solved by the invention can be further realized by respectively arranging valves at the medium inlet, the medium outlet, the nitrogen gas replacement port, the vacuum degree detection port, the composite vacuum gauge interface and the vacuumizing port through the following technical scheme.
A method for detecting a heat-insulating material by using a heat-insulating material performance detection device is characterized by comprising the following steps:
the method comprises the following operation flows:
s1, sampling: sampling the heat-insulating material according to a set size to the accuracy of 0.001g;
s2, drying: drying the sample at 105 +/-5 ℃ for 24 hours;
s3, placing: opening the detection cylinder, binding the heat-insulating material on the outer wall of the inner container by using a glass fiber band, and sealing and fastening the detection cylinder;
and S4, connection: connecting a vacuum unit, a helium mass spectrometer leak detector, a medium pipeline, a composite vacuum gauge and a nitrogen displacement pipeline with corresponding interfaces to ensure that no impurities exist in the pipelines and all valves are in a closed state;
s5, liquid filling: opening a medium inlet valve, and closing the valve after filling the test medium;
s6, working: after the preparation work is finished, starting the vacuum unit and opening the corresponding valve to carry out vacuum-pumping operation on the inner cavity,
after the pressure of the inner cavity is less than the highest pressure allowed by the leak detector, the helium mass spectrometer is started to perform leak detection on the system, and the leak rate of the system is required to be less than or equal to 1.0 multiplied by 10 ﹣9 Pa · m flash/s; after the leakage rate meets the requirement, the inner cavity and sample leakage and deflation rate test is as follows: the GB/T31480 standard annex B requires;
the deflation rate test of the sample is repeated for 5 times, and the average value of the test results of 3 times after the maximum and minimum results are removed is taken as the final result;
the method comprises the following detection methods at different temperatures:
1. and (3) ultra-low temperature test: when the ultralow temperature working condition of-196 ℃ is simulated, opening the medium inlet valve to fill liquid nitrogen, closing the inlet valve after filling is finished, and observing and recording the temperature and pressure of the inner container chamber;
2. and (3) low-temperature testing: when the low-temperature working condition of-20 ℃, 40 ℃ or 80 ℃ below zero is simulated, the medium inlet is connected into a compressor or other refrigerating systems, the temperature of the medium inlet is kept within the range required by the test period, and the temperature and the pressure of the inner container cavity are observed and recorded;
3. and (3) normal temperature test: when the normal temperature working condition is simulated, any medium is not required to be filled, and the temperature and the pressure of the inner container chamber are observed and recorded;
4. and (3) high-temperature testing: when the working condition of high temperature of 50 ℃ is simulated, the medium inlet and the medium outlet are connected into the hot air/hot oil pipeline, so that the temperature of the hot air/hot oil pipeline is kept in the range of the test period, and the temperature and the pressure of the inner container chamber are observed and recorded;
the method comprises the following inspection methods under different states:
static state: when the static working condition is simulated, the vibration platform is closed, and no vibration source is kept nearby the device;
dynamic state: when a dynamic working condition is simulated, starting the vibration platform and keeping the vibration frequency within a set range;
compared with the prior art, the device is provided with the cylinder body, the inner container for winding the heat insulation paper material on the outer surface and the cavity for filling the medium, and has the advantages that the air release rate, the static evaporation rate and other performances of the heat insulation materials such as the heat insulation paper, the heat insulation quilt and the like can be tested, and the problem that the appearance and the packaging condition of the heat insulation material can only be tested and the performance of the heat insulation material cannot be tested when a user carries out incoming material test on the heat insulation material is solved; the simulation test under different temperatures and different states can be satisfied, the comparison of the performances of the heat insulation materials of different brands can be satisfied, and the practicability of the inspection device is improved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention;
in the figure: 1. the device comprises a sight glass, 2 a medium inlet, 3 a fastening device, 4 a nitrogen replacement port, 5 a vacuum degree detection port, 6 a reserved port, 7 a support rod, 8 a vibration platform, 9 a sewage discharge port, 10 a small hole cover, 11 a vacuumizing port, 12 a detection cylinder body, 13 a composite vacuum gauge port, 14 a medium outlet, 15 a temperature sensor, 16 a pressure sensor and 17 an inner container.
Detailed Description
The following further describes particular embodiments of the present invention to facilitate further understanding of the present invention by those skilled in the art, and does not constitute a limitation to the right thereof.
Referring to fig. 1, the device for testing the performance of the heat-insulating material comprises a vibration platform and a detection cylinder body arranged on the vibration platform, wherein an inner container is arranged in the detection cylinder body, the outer surface of the inner container is used for winding the heat-insulating material to be tested, the inner container is suspended in an inner cavity of the detection cylinder body through a hanging belt, and a chamber used for filling media simulating different working conditions is arranged in the inner container;
the detection cylinder is provided with a medium inlet and a medium outlet which are communicated with the chamber of the inner container through a hose;
the detection cylinder is provided with a nitrogen replacement port, a vacuum degree detection port, a composite vacuum gauge interface and a vacuum pumping port which are communicated with the inner cavity of the detection cylinder;
the detection cylinder is provided with a temperature sensor and a pressure sensor which are used for detecting the temperature and the pressure of the inner container.
The top of the detection barrel of this embodiment is equipped with the end cover of being connected through fastener and detection barrel, medium import, medium export, temperature sensor and pressure sensor all set up the top at the end cover.
The end cover of the embodiment is also provided with a sight glass and a lifting lug which can observe the internal condition of the inner cavity, and the inner container is suspended in the detection cylinder body through a hanging strip connected with the lifting lug.
The detection barrel of this embodiment is equipped with the communicating reservation interface in inner chamber with the detection barrel, it is equipped with the valve to reserve the interface.
The bottom of the detection barrel of this embodiment is equipped with the bottom, the bottom center department of bottom is equipped with a drain, still is equipped with the bracing piece between bottom and the vibrations platform.
The medium inlet, the medium outlet, the nitrogen gas replacement port, the vacuum degree detection port, the composite vacuum gauge interface and the vacuumizing port of the embodiment are respectively provided with a valve.
A method for detecting a heat-insulating material by applying a heat-insulating material performance testing device,
the method comprises the following operation flows:
s1, sampling: sampling the heat-insulating material according to a set size to the accuracy of 0.001g;
s2, drying: drying the sample at 105 +/-5 ℃ for 24 hours;
s3, placing: opening the detection cylinder, binding the heat-insulating material on the outer wall of the inner container by using a glass fiber band, and sealing and fastening the detection cylinder;
and S4, connection: connecting a vacuum unit, a helium mass spectrometer leak detector, a medium pipeline, a composite vacuum gauge and a nitrogen displacement pipeline with corresponding interfaces to ensure that no impurities exist in the pipelines and all valves are in a closed state;
s5, liquid filling: opening a medium inlet valve, and closing the valve after filling the test medium;
s6, working: after the preparation work is finished, starting the vacuum unit and opening the corresponding valve to carry out vacuum-pumping operation on the inner cavity,
after the pressure of the inner cavity is less than the highest pressure allowed by the leak detector, the helium mass spectrometer is started to perform leak detection on the system, and the leak rate of the system is required to be less than or equal to 1.0 multiplied by 10 ﹣9 Pa · m flash/s; after the leakage rate meets the requirement, the inner cavity and sample leakage and deflation rate test is as follows: the GB/T31480 standard annex B requires;
the deflation rate test of the sample is repeated for 5 times, and the average value of the test results of 3 times after the maximum and minimum results are removed is taken as the final result;
the method comprises the following detection methods at different temperatures:
1. and (3) ultra-low temperature test: when the ultralow temperature working condition of-196 ℃ is simulated, opening the medium inlet valve to fill liquid nitrogen, closing the inlet valve after filling is finished, and observing and recording the temperature and pressure of the inner container chamber;
2. and (3) low-temperature testing: when the low-temperature working condition of-20 ℃, 40 ℃ or 80 ℃ below zero is simulated, the medium inlet is connected into a compressor or other refrigerating systems, the temperature of the medium inlet is kept in the range of the test period, and the temperature and the pressure of the inner container chamber are observed and recorded;
3. and (3) normal temperature test: when the normal temperature working condition is simulated, any medium is not required to be filled, and the temperature and the pressure of the inner container chamber are observed and recorded;
4. and (3) high-temperature testing: when the working condition of high temperature of 50 ℃ is simulated, the medium inlet and the medium outlet are connected into the hot air/hot oil pipeline, so that the temperature of the hot air/hot oil pipeline is kept in the range of the test period, and the temperature and the pressure of the inner container chamber are observed and recorded;
the method comprises the following detection methods in different states:
static state: when the static working condition is simulated, the vibration platform is closed, and no vibration source is kept nearby the device;
dynamic state: and when the dynamic working condition is simulated, the vibration platform is started, and the vibration frequency is kept within a set range.
The invention provides a thermal insulation material deflation rate, maintenance time and other performance inspection (acceptance) device, which considers the maximum simulation of actual operation conditions, wherein a vacuum unit of the device is butted with a vacuumizing port, a helium mass spectrometer leak detector is butted with a vacuum degree detection port, a medium pipeline is butted with a medium inlet and a medium outlet, a composite vacuum gauge is butted with a composite vacuum gauge interface, and a nitrogen displacement pipeline is butted with a nitrogen displacement port;
the device adopts the following materials: the outer container Q345R is made of carbon steel, the inner container S30408 is made of stainless steel, and a connecting pipe and valve S30408 is made of stainless steel material. The roughness of the carbon steel material is up to Sa2.5 through sand blasting treatment, and the stainless steel material is degreased. After welding lines of the inner container body, the outer container body, a pipeline connected with the inner container body, a valve and the like are qualified through ray detection and penetration detection, and the integral hydraulic test is qualified. The ray detection and the penetration detection are qualified according to the NB/T47013 standard level 1, the water pressure testAnd (4) qualified indexes are tested: the pressure is increased to 1.6MPa, the pressure is maintained for 30 minutes, and the product is qualified without leakage and pressure release. The helium mass spectrometer leak detector is used for detecting the leak of a test system with the leak detection rate of less than or equal to 1.0 multiplied by 10 ﹣9 Pa · m high and vacuum interlayer air leakage rate less than or equal to 1.0 × 10 ﹣9 Pa · m cultivation under vacuum interlayer gas leakage and discharge rate is less than or equal to 5.0 × 10 -7 Pa · m high-speed cultivation under normal temperature and vacuum degree of vacuum interlayer sealing not more than 5.0X 10 -2 Pa。
In order to meet the inspection requirements of different working conditions, inspection methods at different temperatures and inspection methods in different states are designed. The device can be used for the performance test of various different heat-insulating materials, thereby improving the practicability of the device. The actual performance of the heat-insulating material is detected, the reliability of the heat-insulating material can be greatly improved, the heat-insulating performance of the low-temperature product is calculated, and the data such as the vacuum degree, the maintenance time and the like of the low-temperature product are reliably mastered.
When the test is carried out, the tank is required to be kept clean and has no sundries or dirt such as oil stain, water and the like. The integral device is required to be in a completely closed non-leakage state after the valve and the end cover are closed, helium leakage detection is carried out on the integral device, environmental conditions such as temperature, humidity and vacuum degree and related parameters are recorded, and when the vacuum degree of the integral device reaches a specified value, the valve of the vacuumizing port is closed. And detecting and recording the vacuum degree condition of the device, and closing a vacuum degree detection valve. And after the inspection device is allowed to stand for a period of time as required, detecting and recording the vacuum degree of the inspection device again, and taking the vacuum degree as the performance conditions such as the air release rate of the heat-insulating material. The whole test process can be observed through a sight glass.
After the work is finished, replacing the container with nitrogen, taking out the heat insulating material to prevent water from entering, sealing and storing by adopting (0.03 to 0.05MPa) nitrogen positive pressure, protecting each interface and keeping the inside of the device clean.
The test data can be collated to compare the performance conditions of the heat-insulating materials of different manufacturers or different models, and the smaller the leakage and deflation rate is, the better the performance is.
Claims (6)
1. A method for testing the performance of a heat-insulating material is characterized by comprising the following steps: the device comprises a vibration platform and a detection cylinder body arranged on the vibration platform, wherein an inner container with the outer surface used for winding a heat insulation material to be detected is arranged in the detection cylinder body, the inner container is suspended in an inner cavity of the detection cylinder body through a hanging strip, and a cavity used for filling media simulating different working conditions is arranged in the inner container;
the detection cylinder body is provided with a medium inlet and a medium outlet which are communicated with the cavity of the inner container through a hose;
the detection cylinder body is provided with a nitrogen replacement port, a vacuum degree detection port, a composite vacuum gauge interface and a vacuum pumping port which are communicated with the inner cavity of the detection cylinder body;
the specific detection method comprises the following operation flows:
s1, sampling: sampling the heat-insulating material according to a set size to the accuracy of 0.001g;
s2, drying: drying the sample at 105 +/-5 ℃ for 24 hours;
s3, placing: opening the detection cylinder, binding the heat-insulating material on the outer wall of the inner container by using a glass fiber band, and sealing and fastening the detection cylinder;
and S4, connection: connecting a vacuum unit, a helium mass spectrometer leak detector, a medium pipeline, a composite vacuum gauge and a nitrogen displacement pipeline with corresponding interfaces to ensure that no impurities exist in the pipelines and all valves are in a closed state;
s5, liquid filling: opening a medium inlet valve, and closing the valve after filling the test medium;
s6, working: after the preparation work is finished, starting the vacuum unit and opening the corresponding valve to carry out vacuum-pumping operation on the inner cavity,
after the pressure of the inner cavity is less than the highest pressure allowed by the leak detector, the helium mass spectrometer is started to perform leak detection on the system, and the leak rate of the system is required to be less than or equal to 1.0 multiplied by 10 ﹣9 Pa · m flash/s; after the leakage rate meets the requirement, the inner cavity and sample leakage and deflation rate test is as follows: the GB/T31480 standard annex B requires;
the deflation rate test of the sample is repeated for 5 times, and the average value of the test results of 3 times after the maximum and minimum results are removed is taken as the final result;
the method comprises the following detection methods at different temperatures:
1. and (3) ultra-low temperature test: when the ultralow temperature working condition of-196 ℃ is simulated, opening the medium inlet valve to fill liquid nitrogen, closing the inlet valve after filling is finished, and observing and recording the temperature and pressure of the inner container chamber;
2. and (3) low-temperature testing: when the low-temperature working condition of-20 ℃, 40 ℃ or 80 ℃ below zero is simulated, the medium inlet is connected into a compressor or other refrigerating systems, the temperature of the medium inlet is kept in the range of the test period, and the temperature and the pressure of the inner container chamber are observed and recorded;
3. and (3) normal temperature test: when the normal temperature working condition is simulated, any medium is not required to be filled, and the temperature and the pressure of the inner container chamber are observed and recorded;
4. and (3) high-temperature testing: when the working condition of high temperature of 50 ℃ is simulated, the medium inlet and the medium outlet are connected into the hot air/hot oil pipeline, so that the temperature of the hot air/hot oil pipeline is kept in the range of the test period, and the temperature and the pressure of the inner container chamber are observed and recorded;
the method comprises the following detection methods in different states:
static state: when the static working condition is simulated, the vibration platform is closed, and no vibration source is kept nearby the device;
dynamic state: and when the dynamic working condition is simulated, the vibration platform is started, and the vibration frequency is kept within a set range.
2. The method for inspecting the properties of a heat insulating material according to claim 1, wherein: the top of detecting the barrel is equipped with the end cover of being connected through fastener and detection barrel, medium import, medium export, temperature sensor and pressure sensor all set up the top at the end cover.
3. The method for inspecting the properties of a heat insulating material according to claim 2, wherein: the end cover is also provided with a sight glass and a lifting lug which can observe the internal condition of the inner cavity, and the inner container is suspended in the detection cylinder body through a hanging strip connected with the lifting lug.
4. The method for inspecting the properties of a heat insulating material according to claim 1, wherein: the detection barrel is provided with a reserved interface communicated with the inner cavity of the detection barrel, and the reserved interface is provided with a valve.
5. The method for inspecting the properties of a heat insulating material according to claim 1, wherein: the bottom of detecting the barrel is equipped with the bottom, the bottom center department of bottom is equipped with a drain, still is equipped with the bracing piece between bottom and the vibrations platform.
6. The method for inspecting the properties of a heat insulating material according to claim 1, wherein: and valves are respectively arranged at the medium inlet, the medium outlet, the nitrogen replacement port, the vacuum degree detection port, the composite vacuum gauge interface and the vacuumizing port.
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| CN207488217U (en) * | 2017-11-21 | 2018-06-12 | 中国计量大学 | The apparent thermal conductivity of multilayer insulant and outgassing rate test device |
| CN110068431A (en) * | 2019-05-09 | 2019-07-30 | 中南大学 | A kind of leakage test method of aerospace composite tank at low ambient temperatures |
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