Shallow ground temperature field monitoring device

Abstract

The invention relates to the technical field of ground temperature field monitoring, and discloses a shallow ground temperature field monitoring device which comprises a protection pipe vertically arranged underground, and an electric telescopic rod, a temperature sensor, a laser distance measuring sensor, a first reference plate, a comparator and a controller which are arranged in the protection pipe. The electric telescopic rod is arranged in the protection pipe, the temperature sensor is connected with the output end of the electric telescopic rod through the clamping mechanism, a through hole is formed in the side wall of the protection pipe, and the temperature sensor extends out of the protection pipe through the through hole. The device has the following advantages and effects: on one hand, the temperature sensor is ensured to be in close contact with the soil, measurement errors caused by poor contact can be reduced, on the other hand, the temperature sensor is prevented from excessively compacting the soil, and the heat conductivity and the heat capacity are prevented from being influenced by excessive extrusion, so that the measurement accuracy is improved. Therefore, the accuracy and reliability of ground temperature monitoring data are ensured.

Description

Technical Field

[0001] This invention relates to the field of geothermal field monitoring technology, and in particular to a shallow geothermal field monitoring device. Background Technology

[0002] Shallow geothermal monitoring measures surface or near-surface temperatures to capture abnormal temperature signals transmitted from underground heat sources to the surface. It plays a crucial role in geological and mineral exploration, primarily in identifying thermal anomalies, assisting in geothermal resource exploration, guiding oil and gas resource exploration, monitoring mine heat hazards, and supporting geological disaster early warning.

[0003] In the process of shallow geothermal monitoring, temperature sensors detect temperature changes by directly contacting the soil. However, there are instances where the temperature sensor is not in close contact with the soil or is over-compacted. If the temperature sensor is not in close contact with the soil, i.e., there are gaps between the temperature sensor and the soil, air will fill the gaps and form a thermal resistance layer. The thermal conductivity of air (approximately 0.026 W / m·K) is much lower than that of soil (approximately 0.6-2.0 W / m·K for sand and approximately 0.2-0.8 W / m·K for clay), resulting in a significant reduction in heat transfer efficiency. If the temperature sensor is in too close contact with the soil, it will lead to over-compaction at the contact point. Over-compaction will change the soil porosity, density, and water content, thereby affecting its thermal conductivity and heat capacity, and thus affecting the accuracy of the measurement. Therefore, a shallow geothermal field monitoring device is proposed. Summary of the Invention

[0004] The purpose of this invention is to provide a shallow geothermal field monitoring device that ensures close contact between the temperature sensor and the soil without excessive compaction, thereby ensuring the accuracy and reliability of geothermal monitoring data.

[0005] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a shallow geothermal field monitoring device, comprising a vertically installed underground protective pipe, and an electric telescopic rod, a temperature sensor, a laser rangefinder, a first reference plate, a comparator, and a controller installed inside the protective pipe. The protective pipe is vertically installed underground, the electric telescopic rod is installed inside the protective pipe, the temperature sensor is connected to the output end of the electric telescopic rod through a clamping mechanism, the protective pipe has a through hole on its side wall, the temperature sensor extends to the outside of the protective pipe through the through hole, the first reference plate is fixedly connected to the outer peripheral surface of the temperature sensor, the laser rangefinder is installed on the inner wall of the protective pipe and arranged opposite to the first reference plate, and the controller is electrically connected to the comparator, the laser rangefinder, and the electric telescopic rod respectively. The comparator is used to compare the input signal of the laser rangefinder with a preset threshold. The threshold of the comparator is set to the measurement distance value of the laser rangefinder when the electric telescopic rod extends to the point where the temperature sensor is in close contact with the soil.

[0006] By adopting the above technical solution, the protective pipe is vertically installed underground, providing basic support and protection for the entire monitoring device, preventing direct damage to internal components from the external environment, and providing stable space for the installation of other components. The electric telescopic rod is installed inside the protective pipe as a driving component; its output end is connected to the temperature sensor via a clamping mechanism, enabling the temperature sensor to extend and retract, facilitating contact and separation between the temperature sensor and the soil. The temperature sensor extends to the outside of the protective pipe through a through-hole in the side wall, allowing it to directly contact the soil and accurately measure its temperature. The laser rangefinder emits laser light and receives reflected light, measuring the laser's propagation time. The distance between the sensor and the first reference plate is calculated, which determines the position of the temperature sensor. A threshold is preset in the comparator. This threshold is set as the distance measured by the laser rangefinder when the electric telescopic rod extends to make close contact between the temperature sensor and the soil. The laser rangefinder continuously measures the distance between itself and the first reference plate and inputs the measurement signal into the comparator. The comparator compares the input measurement signal with the preset threshold. When the preset threshold is reached, the electric telescopic rod is controlled to stop extending, ensuring that the temperature sensor is in close contact with the soil without excessive compaction. In summary, this device ensures that the temperature sensor is in close contact with the soil without excessive compaction, thereby ensuring the accuracy and reliability of the ground temperature monitoring data.

[0007] A further configuration of the present invention is as follows: the number of electric telescopic rods is two, the two electric telescopic rods are distributed in the vertical direction, the clamping mechanism includes a threaded sleeve fixedly connected to the protruding end of the upper electric telescopic rod and a fixed clamping plate fixedly connected to the protruding end of the lower electric telescopic rod, the threaded sleeve is internally threaded with a threaded rod, the end of the threaded rod is rotatably connected to a movable clamping plate, and the fixed clamping plate and the movable clamping plate are located in the same vertical direction.

[0008] By adopting the above technical solution, the distance between the movable clamping plate and the fixed clamping plate can be adjusted by rotating the threaded rod to clamp the temperature sensor. The use of dual electric telescopic rods and an adjustable clamping mechanism enhances the stability and flexibility of temperature sensor installation, and allows for precise clamping according to the size of the temperature sensor, facilitating installation and maintenance.

[0009] A further feature of the present invention is that an elastic friction layer is fixedly connected to the inner side of the fixed clamping plate and the movable clamping plate. The elastic friction layer is made of silicone material with a Shore hardness of 30A-50A and a thickness of 5mm-15mm.

[0010] By adopting the above technical solution, the elastic friction layer can play a buffering role, on the one hand reducing the squeezing and damage to the temperature sensor during the clamping process and protecting the temperature sensor, and on the other hand increasing the friction force to avoid slipping during the process of pushing the temperature sensor.

[0011] A further feature of the present invention is that it includes a second reference plate, which is fixedly connected to the fixed clamping plate and is located at the end away from the through hole.

[0012] By adopting the above technical solution, the second reference plate provides an additional reference for determining the position of the temperature sensor, which helps to install and position the temperature sensor more accurately and improve the overall accuracy of the monitoring device.

[0013] A further embodiment of the present invention includes a rectangular frame, wherein the electric telescopic rod, temperature sensor, laser rangefinder, first reference plate, comparator, and controller are disposed inside the rectangular frame, and a buffer mechanism is provided between the electric telescopic rod and the inner wall of the rectangular frame. The buffer mechanism includes a box fixedly connected to the inner wall of the rectangular frame, and a groove is provided on the inner side wall of the box. A cross-shaped sliding plate is slidably connected inside the groove. A spring is fixedly connected between the inner side of the cross-shaped sliding plate and the inner bottom wall of the box, and the bottom end of the electric telescopic rod is fixedly connected to the outer side of the cross-shaped sliding plate.

[0014] By adopting the above technical solution, when the electric telescopic pole is impacted by the temperature sensor, the cross-shaped slide plate slides in the groove, and the spring plays a buffering role, which can prevent the temperature sensor from directly hitting the soil, prevent excessive compaction at the contact point with the soil, protect the temperature sensor and the soil structure, and at the same time reduce the impact of external impacts on the electric telescopic pole and the temperature sensor, thereby improving the stability and reliability of the device.

[0015] A further feature of the present invention is that the controller is a programmable logic controller, model number FX3U-32MT-ES / A.

[0016] By adopting the above technical solutions, the programmable logic controller has high reliability, flexibility and powerful control functions, which can meet the complex ground temperature monitoring and control requirements and facilitate the realization of automated control and remote monitoring.

[0017] A further feature of the present invention is that the laser ranging sensor has a measurement range of 0.05m to 10m and a measurement accuracy of ±1mm.

[0018] By adopting the above technical solution, the appropriate measurement range and high measurement accuracy can ensure that the laser rangefinder accurately measures the distance between the temperature sensor and related components, providing accurate data support for the controller to control the electric telescopic pole and improving the control accuracy of the device.

[0019] A further configuration of the present invention is as follows: the controller includes a signal processing module and a drive module, the signal processing module is used to receive the comparison result of the comparator and generate control commands based on the comparison result, and the drive module is used to control the telescopic movement of the electric telescopic rod according to the control commands.

[0020] By adopting the above technical solution, the controller's functions are modularized. The signal processing module focuses on signal processing and analysis, while the drive module focuses on executing control commands, which improves the controller's processing efficiency and reliability, making the device's control more precise and stable.

[0021] The beneficial effects of this invention are: 1. This device ensures close contact between the temperature sensor and the soil, reducing measurement errors caused by poor contact. On the other hand, it avoids excessive compaction of the soil by the temperature sensor, preventing damage to its thermal conductivity and heat capacity due to excessive compression. In summary, this device ensures close contact between the temperature sensor and the soil without excessive compaction, thereby ensuring the accuracy and reliability of the ground temperature monitoring data.

[0022] 2. Through the coordinated operation of the laser rangefinder, comparator, and controller, the extension and retraction of the electric telescopic pole is automatically controlled, eliminating the need for frequent manual intervention, reducing errors and workload of manual operation, and improving monitoring efficiency and automation. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the internal structure of the protective tube of the present invention; Figure 2 This is a side view of the fixed clamping plate and the movable clamping plate of the present invention. Figure 3 This is a schematic diagram of the buffer mechanism of the present invention; Figure 4 This is a schematic diagram of the control principle of the present invention.

[0025] In the diagram, 1. Protective tube; 2. Buffer mechanism; 201. Box; 202. Spring; 203. Slide groove; 204. Cross-shaped sliding plate; 3. Second reference plate; 4. Electric telescopic rod; 5. Laser rangefinder; 6. Controller; 7. Comparator; 8. First reference plate; 9. Fixed clamping plate; 10. Temperature sensor; 11. Elastic friction layer; 12. Through hole; 13. Movable clamping plate; 14. Threaded sleeve; 15. Threaded rod; 16. Pull rope; 17. Rectangular frame; 18. Roller. Detailed Implementation

[0026] The technical solution of the present invention will now be clearly and completely described in conjunction with specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] Reference Figures 1-4 A shallow geothermal field monitoring device includes a vertically installed underground protective pipe 1, and an electric telescopic rod 4, a temperature sensor 10, a laser rangefinder 5, a first reference plate 8, a comparator 7, and a controller 6 installed inside the protective pipe 1. The protective pipe 1 is vertically installed underground, the electric telescopic rod 4 is installed inside the protective pipe 1, the temperature sensor 10 is connected to the output end of the electric telescopic rod 4 through a clamping mechanism, the protective pipe 1 has a through hole 12 on its side wall, the temperature sensor 10 extends to the outside of the protective pipe 1 through the through hole 12, the first reference plate 8 is fixedly connected to the outer peripheral surface of the temperature sensor 10, the laser rangefinder 5 is installed on the inner wall of the protective pipe 1 and is arranged opposite to the first reference plate 8, and the controller 6 is electrically connected to the comparator 7, the laser rangefinder 5 and the electric telescopic rod 4 respectively. The comparator 7 is used to compare the input signal of the laser rangefinder 5 with a preset threshold. The threshold of the comparator 7 is set to the measurement distance value of the laser rangefinder 5 when the electric telescopic rod 4 extends to the point where the temperature sensor 10 is in close contact with the soil. The protective pipe 1 is vertically installed underground, providing foundation support and protection for the entire monitoring device, preventing direct damage to internal components from the external environment, and providing stable space for the installation of other components. The electric telescopic rod 4 is installed inside the protective pipe 1, serving as a driving component. Its output end is connected to the temperature sensor 10 via a clamping mechanism, enabling the temperature sensor 10 to extend and retract, facilitating contact and separation between the temperature sensor 10 and the soil. The temperature sensor 10 extends to the outside of the protective pipe 1 through a through-hole 12 on its side wall, allowing it to directly contact the soil and accurately measure its temperature. The laser ranging sensor 5 emits laser light and receives reflected light, calculating the distance to the first base by measuring the laser's propagation time. The distance between the reference plates 8 determines the position of the temperature sensor 10. The comparator 7 presets a threshold value, which is set as the distance measured by the laser rangefinder 5 when the electric telescopic rod 4 extends to make close contact between the temperature sensor 10 and the soil. The laser rangefinder 5 continuously measures the distance between itself and the first reference plate 8 and inputs the measurement signal into the comparator. The comparator 7 compares the input measurement signal with the preset threshold value. When the preset threshold value is reached, the electric telescopic rod 4 is controlled to stop extending, ensuring that the temperature sensor 10 is in close contact with the soil without excessive compaction. In summary, this device ensures that the temperature sensor 10 is in close contact with the soil without excessive compaction, thereby ensuring the accuracy and reliability of the ground temperature monitoring data.

[0028] There are two electric telescopic rods 4, which are arranged vertically. The clamping mechanism includes a threaded sleeve 14 fixedly connected to the extended end of the upper electric telescopic rod 4 and a fixed clamping plate 9 fixedly connected to the extended end of the lower electric telescopic rod 4. The threaded sleeve 14 is internally threaded with a threaded rod 15, and the end of the threaded rod 15 is rotatably connected to a movable clamping plate 13. The fixed clamping plate 9 and the movable clamping plate 13 are located in the same vertical direction. By rotating the threaded rod 15, the distance between the movable clamping plate 13 and the fixed clamping plate 9 can be adjusted to clamp the temperature sensor 10. The use of dual electric telescopic rods 4 and an adjustable clamping mechanism enhances the stability and flexibility of the temperature sensor installation. It can be precisely clamped according to the size of the temperature sensor 10, which is convenient for installation and maintenance.

[0029] An elastic friction layer 11 is fixedly connected to the inner side of the fixed clamping plate 9 and the movable clamping plate 13. The elastic friction layer 11 is made of silicone material with a Shore hardness of 30A-50A and a thickness of 5mm-15mm. The elastic friction layer 11 can play a buffering role, on the one hand reducing the squeezing and damage to the temperature sensor 10 during the clamping process and protecting the temperature sensor 10, and on the other hand increasing the friction force to avoid slipping during the pushing of the temperature sensor 10.

[0030] It also includes a second reference plate 3, which is fixedly connected to the fixed clamping plate 9. The second reference plate 3 is located at the end away from the through hole 12. The second reference plate 3 provides an additional reference for determining the position of the temperature sensor 10, which helps to install and position the temperature sensor 10 more accurately and improve the overall accuracy of the monitoring device.

[0031] It also includes a rectangular frame 17. The electric telescopic rod 4, temperature sensor 10, laser rangefinder 5, first reference plate 8, comparator 7, and controller 6 are disposed inside the rectangular frame 17. A buffer mechanism 2 is provided between the electric telescopic rod 4 and the inner wall of the rectangular frame 17. The buffer mechanism 2 includes a box 201 fixedly connected to the inner wall of the rectangular frame 17. A groove 203 is provided on the inner side wall of the box 201. A cross-shaped sliding plate 204 is slidably connected inside the groove 203. The inner side of the cross-shaped sliding plate 204 is flush with the inner bottom wall of the box 201. A spring 202 is fixedly connected between the electric telescopic rod 4 and the bottom end of the electric telescopic rod 4 is fixedly connected to the outer side of the cross-shaped sliding plate 204. When the electric telescopic rod 4 is impacted by the temperature sensor 10, the cross-shaped sliding plate 204 slides in the sliding groove 203. The spring 202 plays a buffering role, which can prevent the temperature sensor 10 from directly hitting the soil, prevent excessive compaction at the contact point with the soil, protect the temperature sensor 10 and the soil structure, and at the same time reduce the impact of external impact on the electric telescopic rod 4 and the temperature sensor 10, thereby improving the stability and reliability of the device.

[0032] Controller 6 is a programmable logic controller, model FX3U-32MT-ES / A. Programmable logic controllers have high reliability, flexibility and powerful control functions, which can meet the complex ground temperature monitoring and control requirements, and facilitate the realization of automated control and remote monitoring.

[0033] The laser rangefinder 5 has a measurement range of 0.05m to 10m and a measurement accuracy of ±1mm. The suitable measurement range and high measurement accuracy can ensure that the laser rangefinder 5 accurately measures the distance between the temperature sensor 10 and related components, providing accurate data support for the controller 6 to control the electric telescopic rod 4 and improving the control accuracy of the device.

[0034] A pull rope 16 is fixedly connected to the top of the rectangular frame 17. The rectangular frame 17 can be lifted by pulling the rope 16. The pull rope 16 makes it easy to lift the temperature sensor 10 from the ground, which facilitates maintenance, repair and replacement of parts, and improves the maintainability of the device.

[0035] Multiple rollers 18 are rotatably connected to the outer surface of the rectangular frame 17. The rollers 18 are located between the protective tube 1 and the rectangular frame 17. The rotatable connection of multiple rollers 18 to the outer surface of the rectangular frame 17 allows the rectangular frame 17 to slide relative to the protective tube 1. The rollers 18 reduce the friction between the rectangular frame 17 and the protective tube 1, making it easier to install, move and adjust the rectangular frame 17 within the protective tube 1, reducing the difficulty of operation and improving the installation efficiency of the device.

[0036] The controller 6 includes a signal processing module and a drive module. The signal processing module is used to receive the comparison result of the comparator 7 and generate control commands based on the comparison result. The drive module is used to control the extension and retraction of the electric telescopic rod 4 according to the control commands. By modularizing the functions of the controller 6, the signal processing module focuses on signal processing and analysis, while the drive module focuses on executing control commands, which improves the processing efficiency and reliability of the controller and makes the control of the device more precise and stable.

[0037] The present invention has the following effects: 1. On the one hand, the device ensures that the temperature sensor 10 is in close contact with the soil, which can reduce the measurement error caused by poor contact. On the other hand, it avoids the temperature sensor 10 from being over-compacted with the soil, which can prevent the thermal conductivity and heat capacity from being affected by excessive compression. In summary, the device ensures that the temperature sensor 10 is in close contact with the soil without being over-compacted, thereby ensuring the accuracy and reliability of the ground temperature monitoring data.

[0038] 2. Through the coordinated operation of the laser rangefinder 5, comparator 7 and controller 6, the extension and retraction of the electric telescopic pole 4 is automatically controlled, eliminating the need for frequent manual intervention, reducing errors and workload of manual operation, and improving monitoring efficiency and automation.

Claims

1. A shallow geothermal field monitoring device, characterized in that, The system includes a vertically installed underground protective pipe (1), and an electric telescopic rod (4), a temperature sensor (10), a laser rangefinder (5), a first reference plate (8), a comparator (7), and a controller (6) installed inside the protective pipe (1). The temperature sensor (10) is connected to the output end of the electric telescopic rod (4) through a clamping mechanism. The protective pipe (1) has a through hole (12) on its side wall, through which the temperature sensor (10) extends to the outside of the protective pipe (1). The first reference plate (8) is fixedly connected to the temperature sensor. The outer peripheral surface of the sensor (10) is provided with the laser range sensor (5) disposed on the inner wall of the protective tube (1) and arranged opposite to the first reference plate (8). The controller (6) is electrically connected to the comparator (7), the laser range sensor (5) and the electric telescopic rod (4). The comparator (7) is used to compare the input signal of the laser range sensor (5) with a preset threshold. The threshold of the comparator (7) is set to the measured distance value of the laser range sensor (5) when the electric telescopic rod (4) extends to the point where the temperature sensor (10) is in close contact with the soil.

2. The shallow geothermal field monitoring device according to claim 1, characterized in that: The number of electric telescopic rods (4) is two, and the two electric telescopic rods (4) are arranged vertically. The clamping mechanism includes a threaded sleeve (14) fixedly connected to the extended end of the upper electric telescopic rod (4) and a fixed clamping plate (9) fixedly connected to the extended end of the lower electric telescopic rod (4). The threaded sleeve (14) is internally threaded with a threaded rod (15), and the end of the threaded rod (15) is rotatably connected to a movable clamping plate (13). The fixed clamping plate (9) and the movable clamping plate (13) are located in the same vertical direction.

3. The shallow geothermal field monitoring device according to claim 2, characterized in that: An elastic friction layer (11) is fixedly connected to the inner side of the fixed clamping plate (9) and the movable clamping plate (13). The elastic friction layer (11) is made of silicone material with a Shore hardness of 30A-50A and a thickness of 5mm-15mm.

4. A shallow geothermal field monitoring device according to claim 3, characterized in that: It also includes a second reference plate (3), which is fixedly connected to the fixed clamping plate (9) and is located at the end away from the through hole (12).

5. A shallow geothermal field monitoring device according to claim 4, characterized in that: It also includes a rectangular frame (17), the electric telescopic rod (4), temperature sensor (10), laser rangefinder (5), first reference plate (8), comparator (7) and controller (6) are set inside the rectangular frame (17), a buffer mechanism (2) is provided between the electric telescopic rod (4) and the inner wall of the rectangular frame (17), the buffer mechanism (2) includes a box (201) fixedly connected to the inner wall of the rectangular frame (17), the inner side wall of the box (201) is provided with a slide groove (203), a cross-shaped slide plate (204) is slidably connected inside the slide groove (203), a spring (202) is fixedly connected between the inner side of the cross-shaped slide plate (204) and the inner bottom wall of the box (201), and the bottom end of the electric telescopic rod (4) is fixedly connected to the outer side of the cross-shaped slide plate (204).

6. A shallow geothermal field monitoring device according to claim 1, characterized in that: The controller (6) is a programmable logic controller, model number FX3U-32MT-ES / A.

7. A shallow geothermal field monitoring device according to claim 1, characterized in that: The laser rangefinder (5) has a measurement range of 0.05m to 10m and a measurement accuracy of ±1mm.

8. A shallow geothermal field monitoring device according to claim 1, characterized in that: The controller (6) includes a signal processing module and a drive module. The signal processing module is used to receive the comparison result of the comparator (7) and generate control commands based on the comparison result. The drive module is used to control the telescopic movement of the electric telescopic rod (4) according to the control commands.

Images