Portable device for measuring heat conductivity coefficient of frozen soil and predicting frozen soil environment

Abstract

The utility model relates to the technical field of frozen soil environment monitoring, and provides a portable device for measuring the heat conductivity coefficient of frozen soil and predicting the frozen soil environment, the device uses a thermocouple (2), a cylindrical constant-temperature heat source (3), a data acquisition card (7) and other components, the thermocouple (2) can directly measure the center temperature of a frozen soil sample, and the cylindrical constant-temperature heat source (3) can directly measure the center temperature of the frozen soil sample. Data are recorded in real time through the data acquisition card (7) and transmitted to a database through the antenna (1) for analysis and comparison, the center temperature of the frozen soil sample is directly measured, and a 0-DEG C constant-temperature boundary environment is provided through the cylindrical constant-temperature heat source (3). The outside of the device is coated with a heat insulation coating, real-time experimental data can be exported, and data of frozen soil temperature changing along with time can be recorded. The device can quickly measure the heat conductivity coefficient of the frozen soil in a field environment and predict the change of the frozen soil environment.

Description

Technical Field

[0001] The utility model relates to the technical field of frozen soil environment monitoring, in particular to a portable detection device for detecting ice content in frozen soil. Background Art

[0002] Under the influence of global warming, the permafrost buried underground has begun to thaw, and the door of the earth's "refrigerator" has quietly opened, which may bring severe challenges to the ecological environment, water cycle and climate system.

[0003] Frozen soil and its changes have important impacts on water and heat exchange between the earth-atmosphere system, surface hydrological processes, cold-region ecosystems, and the stability of cold-region engineering buildings. Therefore, monitoring and research on frozen ground temperature has always been one of the core issues in cryogenics research.

[0004] For the meteorological department, the monitoring of frozen soil mainly involves manual observation of the freezing depth and automatic monitoring of deep ground temperature. Foreign permafrost areas have a history of construction and operation for decades, and have accumulated rich experience in the design, construction, inspection, operation and management of pavements and pipelines. In particular, a large number of theoretical and experimental studies have been conducted on the impact of geological disasters such as frozen heave and thaw settlement on pipelines in permafrost areas. For the construction of oil and gas pipelines in permafrost areas, my country has also accumulated some experience in construction, inspection and management of permafrost areas. With the extensive and in-depth development of frozen soil research, the thermal conductivity of ice in frozen soil has been studied. At present, in the fields of municipal construction, pipeline laying, earth science, etc. that need to involve frozen soil issues, the research on the relevant parameters of water content in frozen soil is relatively vacant. In addition, the relevant research on seasonal frozen soil is also very immature and controversial in many aspects. The root cause of the controversy lies in the immaturity of frozen soil test technology, which is manifested in many aspects, including the lack of seasonal frozen soil test standards and the limitation of test instruments.

[0005] At present, the calorimeter flow method is usually used to measure the thermal conductivity of frozen soil ice in China. However, the calorimeter flow method is sensitive to ambient temperature and the results are prone to errors. It is complex to install and maintain, and the cost of use is increased. The market has a large demand for thermal conductivity measurement services for frozen soil ice, but there is a lack of professionally qualified testing institutions and affordable frozen soil ice measurement products. Therefore, how to overcome the problems of existing frozen soil testing equipment, such as large size, long testing time, inability to measure on site, and high price, is an urgent problem that technicians in this field need to solve. Utility Model Content

[0006] In view of the problems existing in the above-mentioned prior art, the purpose of the utility model is to launch a convenient, rapid and affordable frozen soil thermal conductivity detection product.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] A portable device for measuring thermal conductivity of frozen soil and predicting frozen soil environment, characterized in that it includes an antenna, a thermocouple, a cylindrical constant temperature heat source, a protective shell, a PC interface, a controllable power battery, and a data acquisition card, wherein the antenna is installed on the top of the protective shell and is used to transmit data to a database for analysis and comparison; the thermocouple is fixed at the center position of the lower top of the protective shell and is used to directly measure the center temperature of the frozen soil sample; the cylindrical constant temperature heat source and the controllable power battery are respectively arranged on the top and side walls of the protective shell, the cylindrical constant temperature heat source provides a constant temperature boundary environment of 0 degrees Celsius for the experimental sample, and the controllable power battery provides electrical energy for the antenna, the thermocouple, the cylindrical constant temperature heat source and the data acquisition card; the PC interface is used to export the measured real-time experimental data; the data acquisition card performs integrated processing and is used to record data on changes in frozen soil temperature over time.

[0009] On the basis of the above technical solution, the following technical features can be added for further limitation.

[0010] Optionally, the protective shell has a heat insulation coating on the outside.

[0011] The utility model has the following beneficial effects:

[0012] As for hardware equipment, the product can achieve high-precision measurement of the thermal conductivity of ice in permafrost, which will help further study and understand the thermal conduction characteristics in permafrost environments, and provide important scientific basis for decision-making and applications in permafrost engineering and other related fields.

[0013] For the measurement part: thermocouples, cylindrical constant temperature heat sources, annular cylindrical controllable power batteries and cylindrical IoT modules are assembled to further improve the portability, safety and protection of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The drawings in the specification, which constitute a part of the present application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0015] Figure 1 , Figure 2 , Figure 3 A schematic diagram showing the connection and setting of the antenna 1 and the protective shell 4 is shown.

[0016] Figure 4 A schematic diagram of the appearance of the protective shell 4 is shown.

[0017] Figure 5 A schematic structural diagram of the antenna 1 is shown.

[0018] Figure 6The internal connection and setting diagram of the antenna 1 and the thermocouple 2 in the protective shell 4 are shown.

[0019] Figure 7 The schematic diagram of the structure of the data acquisition card 7 is shown.

[0020] The markings shown in the figure are explained as follows: antenna 1, thermocouple 2, cylindrical constant temperature heat source 3, protective shell 4, PC terminal interface 5, controllable power battery 6, data acquisition card 7. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0022] like Figure 1-Figure 7 As shown, a portable device for measuring thermal conductivity of frozen soil and predicting frozen soil environment is characterized by: comprising an antenna 1, a thermocouple 2, a cylindrical constant temperature heat source 3, a protective shell 4, a PC terminal interface 5, a controllable power storage battery 6, and a data acquisition card 7, wherein the antenna 1 is installed on the top of the protective shell 4, and is used to transmit data to the database for analysis and comparison; the thermocouple 2 is fixed at the center position of the top lower part of the protective shell 4, and is used to directly measure the center temperature of the frozen soil sample; the cylindrical constant temperature heat source 3 and the controllable power storage battery 6 are respectively arranged on the top and side wall of the protective shell 4, and the cylindrical constant temperature heat source 3 provides a constant temperature boundary environment of 0 degrees Celsius for the experimental sample, and the controllable power storage battery 6 provides power for the antenna 1, the thermocouple 2, the cylindrical constant temperature heat source 3 and the data acquisition card 7; the PC terminal interface 5 is used to derive the measured real-time experimental data; the data acquisition card 7 performs integrated processing and is used to record the data of frozen soil temperature changes over time. The outer layer of the protective shell 4 can be coated with a heat-insulating material. The cylindrical constant temperature heat source 3 mainly provides a constant temperature for the frozen soil being measured inside, so as to maintain a constant temperature difference between the inside and outside of the instrument and ensure the accuracy of the experiment. The protective shell 4 mainly protects the internal structure of the instrument and has a heat preservation effect. It is coated with heat-insulating paint to reduce the impact of the external environment on the experiment and reduce the changes in the heat transfer from the constant temperature heat source to the external soil. The design of the cylindrical constant temperature heat source 3 and the protective shell 4 enables the instrument to operate stably under various conditions, ensuring the reliability and accuracy of the experiment.

[0023] like Figure 5 As shown, after the measurement starts, the data can be transmitted to the database for analysis and comparison using the antenna 1, and the center temperature of the frozen soil sample can be directly measured. The real-time data can also be exported through the PC interface 5.

[0024] like Figure 6As shown, the thermocouple 2 is fixed at the center of the top lower part of the protective shell 4, and is used to directly measure the center temperature of the frozen soil sample. During the field measurement process, the instrument is placed in the frozen soil sample, the power is turned on, and the thermocouple 2 can measure the temperature change of the frozen soil in real time, and transmit the monitoring data to the database through the PC terminal interface 5.

[0025] like Figure 7 As shown, a schematic diagram of the structure of the data acquisition card 7. The data acquisition card 7 is a type of computer hardware, connected to the computer through a data connection interface, and is used to convert the temperature signal into a digital signal so that the computer can process and analyze these signals. The data acquisition card 7 generally includes an analog-to-digital converter (ADC) and a digital-to-analog converter (DAC), as well as an input / output (I / O) channel, which is used to communicate data with the antenna 1 and the computer.

[0026] In summary, the first generation of products developed by the project team include ice melting heat measuring instrument, Smacq data acquisition card device, thermocouple and acrylic plate. The products can achieve high-precision thermal conductivity measurement of ice in frozen soil, which is helpful for further research and understanding of thermal conductivity characteristics in frozen soil environment, and provide important scientific basis for decision-making and application in frozen soil engineering and other related fields. Thermocouple, cylindrical constant temperature heat source, annular column controllable power battery and cylindrical IoT module are assembled to further improve the portability, safety and protection of the equipment.

Claims

1. A portable device for measuring thermal conductivity of frozen soil and predicting frozen soil environment, characterized in that: The invention comprises an antenna (1), a thermocouple (2), a cylindrical constant temperature heat source (3), a protective shell (4), a PC interface (5), a controllable power storage battery (6), and a data acquisition card (7), wherein the antenna (1) is arranged on the top of the protective shell (4) and is used to transmit data to a database for analysis and comparison; the thermocouple (2) is fixed at the center position of the lower top of the protective shell (4) and is used to directly measure the center temperature of the frozen soil sample; the cylindrical constant temperature heat source (3) and the controllable power storage battery (6) are respectively arranged on the top and side wall of the protective shell (4); the cylindrical constant temperature heat source (3) provides a constant temperature boundary environment of 0 degrees Celsius for the experimental sample, and the controllable power storage battery (6) provides electric energy for the antenna (1), the thermocouple (2), the cylindrical constant temperature heat source (3) and the data acquisition card (7); the PC interface (5) is used to derive the measured real-time experimental data; the data acquisition card (7) performs integrated processing and is used to record the data of the frozen soil temperature changing with time.

2. A portable device for measuring thermal conductivity of frozen soil and predicting frozen soil environment according to claim 1, characterized in that: The protective shell (4) has a heat insulation coating on its outer surface.

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