Shallow geothermal energy monitoring device

Abstract

The utility model relates to the technical field of geothermal energy monitoring, and particularly discloses a shallow geothermal energy monitoring device which comprises an outer cylinder and an inner cylinder, a hollow-out pipe is connected inside the inner cylinder through a support, an optical fiber cable is arranged in the middle of the hollow-out pipe and connected with an optical information transceiver, and a plurality of vertical grooves are formed in the circumferential surfaces of the outer sides of the outer cylinder and the inner cylinder at equal angles. According to the technical scheme, the optical fiber cable is matched with the optical information receiving and transmitting all-in-one machine, geothermal energy is monitored through the distributed optical fiber temperature measurement technology principle, precision is high, the anti-electromagnetic interference capacity is high, the multiple outer cylinders and the multiple inner cylinders are vertically and rapidly spliced, so that external protection is conducted on the optical fiber cable, the inner cylinders can rotate mutually, the vertical groove B and the vertical groove A are aligned, and the geothermal energy is monitored. And the vertical groove is matched with the through hole of the hollow pipe, so that the optical fiber cable can be protected from the outside, and the problem of temperature measurement errors caused by a closed environment is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of geothermal energy monitoring, in particular to a shallow geothermal energy monitoring device. Background Art

[0002] Geothermal energy is currently widely used. Geothermal power generation is one of the key ways to utilize geothermal energy. Geothermal heating utilizes the stable underground temperature for air conditioning and indoor temperature control. Using geothermal energy to heat greenhouses can create an environment suitable for crop growth, improving crop yields and quality. Geothermal energy can also be used in industrial processes such as pulp cooking, evaporating seawater to make salt, desalination, drying various raw materials and products, and petroleum refining. These applications not only improve industrial production efficiency but also reduce production costs. With the continuous advancement of technology and the increasing awareness of environmental protection, the application prospects of geothermal energy will become even broader.

[0003] Currently, there are two ways to monitor geothermal energy: distributed fiber optic temperature measurement technology and geophysical detection technology. When using distributed fiber optic temperature measurement technology to monitor geothermal energy, the fiber optic line has weak protection and cannot use thicker protection, which will affect the changes in the fiber optic sensor temperature. Protection and monitoring accuracy cannot be met at the same time. Therefore, we propose a shallow geothermal energy monitoring device. Utility Model Content

[0004] The purpose of the utility model is to provide a shallow geothermal energy monitoring device to solve the problems raised in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a shallow geothermal energy monitoring device, comprising an outer tube, an inner tube rotatably arranged inside the outer tube, a hollow tube connected to the inner tube through a bracket, an optical fiber is arranged in the middle of the hollow tube, and the optical fiber is connected to an optical information transceiver. A plurality of vertical grooves A are opened at equal angles on the outer circumferential surface of the outer tube, and a plurality of vertical grooves B are opened at equal angles on the outer circumferential surface of the inner tube.

[0006] Furthermore, flanges are integrally formed on the upper and lower end surfaces of the outer cylinder. There are several outer cylinders, which are stacked vertically and fastened together by bolts.

[0007] Furthermore, the upper and lower end surfaces of the inner cylinder are integrally formed with convex ring platforms, the surface of the convex ring platform on the upper end surface of the inner cylinder is provided with a concave hole, and the surface of the convex ring platform on the lower end surface of the inner cylinder is provided with a convex column.

[0008] Furthermore, bearings are embedded in the outer circumferential surfaces of the convex ring platforms on the upper and lower end surfaces of the inner cylinder, and the outer rings of the bearings are connected to the inner wall of the outer cylinder by interference fitting.

[0009] Furthermore, a rotating part is provided on the top of the inner cylinder at the top end, a convex rod is provided on the bottom surface of the rotating part, and a through hole for passing the optical fiber is provided in the middle of the rotating part. The convex rod of the rotating part cooperates with the concave hole of the inner cylinder at the top end to rotate the inner cylinder.

[0010] Furthermore, the outer diameter of the inner cylinder is 1 mm smaller than the inner diameter of the outer cylinder, and the number and size of the vertical grooves A and B are consistent.

[0011] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0012] The technical solution of the present application uses an optical fiber line in conjunction with an optical information transceiver to monitor geothermal energy using the principle of distributed optical fiber temperature measurement technology. It has high accuracy and strong anti-electromagnetic interference ability. By quickly splicing multiple outer and inner tubes vertically, the optical fiber line is externally protected. The inner tubes can rotate with each other so that the vertical groove B is aligned with the vertical groove A. The vertical groove cooperates with the through hole of the hollow tube to protect the optical fiber line externally and avoid the problem of temperature measurement errors caused by a closed environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Other features, objects and advantages of the present invention will become more apparent from the detailed description of the non-limiting embodiments with reference to the following drawings:

[0014] Figure 1 This is a three-dimensional diagram of a shallow geothermal energy monitoring device of the utility model;

[0015] Figure 2 This is a front view of a shallow geothermal energy monitoring device according to the present invention;

[0016] Figure 3 It is a structural diagram of the outer cylinder;

[0017] Figure 4 This is a schematic diagram of the structure when the inner cylinder is equipped with a bearing;

[0018] Figure 5 It is a cross-sectional view of the inner cylinder.

[0019] In the figure: 1. outer cylinder; 101. vertical groove A; 102. flange; 2. rotating part; 3. optical fiber; 4. optical information transceiver; 5. inner cylinder; 501. vertical groove B; 502. convex ring platform; 6. bearing; 7. concave hole; 8. hollow tube; 801. bracket; 9. convex column. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Example 1, as Figure 1-5 As shown, the utility model provides a technical solution: a shallow geothermal energy monitoring device, comprising an outer cylinder 1, an inner cylinder 5 rotatably arranged inside the outer cylinder 1, a hollow tube 8 connected to the inner cylinder 5 through a bracket 801, an optical fiber 3 is arranged in the middle of the hollow tube 8, and the optical fiber 3 is connected to an optical information transceiver 4, a plurality of vertical grooves A101 are equiangularly opened on the outer circumferential surface of the outer cylinder 1, and a plurality of vertical grooves B501 are equiangularly opened on the outer circumferential surface of the inner cylinder 5.

[0022] In a specific embodiment of the present invention, the basic principle of distributed optical fiber temperature measurement technology is to utilize the thermal effect of optical fiber and use optical fiber as a sensor to realize temperature detection. When the optical fiber is subjected to temperature changes, the refractive index, loss and other parameters of the optical fiber material will change, thereby changing the transmission characteristics of the optical signal. Specifically, after the single-wavelength emission light is incident on the optical fiber, the scattered light returned from the optical fiber includes three frequency classifications: Rayleigh scattering, Raman scattering and Brillouin scattering. Among them, Rayleigh scattering is insensitive to temperature, while Raman scattering and Brillouin scattering have temperature modulation characteristics, which can be used as a technical solution for distributed optical fiber temperature measurement. In distributed optical fiber temperature measurement technology, optical phenomena such as Raman scattering spectroscopy or Brillouin scattering spectroscopy are usually used to realize temperature measurement. These scattering phenomena will cause the frequency of the optical signal to change. By measuring these frequency changes, temperature information can be obtained;

[0023] The optical information transceiver 4 includes a pulse light source transmitter, a photodetector, and a power supply component. The pulse light source transmitter uses a narrow linewidth pulse light source (such as a pulsed laser) to transmit light pulses with stable wavelengths to the optical fiber. Part of the scattered light generated during the transmission of the light pulse in the optical fiber will return along the original path and be received by the photodetector. By measuring the power distribution and time distribution of the scattered light, the temperature information along the optical fiber can be obtained. Based on the speed of light and the pulse emission time, the optical fiber position corresponding to the scattered light can be determined to achieve spatial resolution along the optical fiber. The scattered light power distribution is converted into a temperature distribution along the optical fiber using the calibration relationship between the Raman scattered light intensity ratio or the Brillouin scattered light intensity change and temperature.

[0024] When installing the outer cylinder 1, first align the vertical groove B501 of the inner cylinder 5 with the vertical groove A101 of the outer cylinder 1, and then vertically install the outer cylinders 1 in sequence. The flanges 102 between the outer cylinders 1 are fastened together by bolts. Between adjacent inner cylinders 5, the convex column 9 at the bottom of the upper inner cylinder 5 cooperates with the concave hole 7 at the top of the lower inner cylinder 5. A rotating member is provided at the top of the topmost inner cylinder, and a convex rod is provided on the bottom surface of the rotating member. The convex rod of the rotating member cooperates with the concave hole of the topmost inner cylinder to rotate the inner cylinder. A through hole for passing the optical fiber line 3 is provided in the middle of the rotating member.

[0025] During the process of inserting the outer tube 1 deep into the bottom layer, it is necessary to stagger the vertical groove B501 of the inner tube 5 with the vertical groove A101 of the outer tube 1 to prevent soil from entering the inner tube 5. When the outer tube 1 is inserted into place, the vertical groove B501 of the inner tube 5 can be rotated to align with the vertical groove A101 of the outer tube 1. The vertical groove cooperates with the through hole of the hollow tube to protect the optical fiber line 3 on the outside and avoid the problem of temperature measurement errors caused by a closed environment.

[0026] In the preferred technical solution, the upper and lower end surfaces of the outer cylinder 1 are integrally formed with flanges 102. There are several outer cylinders 1, which are stacked vertically and fastened together by bolts to achieve splicing and disassembly between the outer cylinders 1. The number of outer cylinders 1 is increased or decreased according to the monitoring depth.

[0027] In the preferred technical solution, the upper and lower end surfaces of the inner cylinder 5 are integrally formed with a convex ring platform 502. The surface of the convex ring platform on the upper end surface of the inner cylinder 5 is provided with a concave hole 7, and the surface of the convex ring platform on the lower end surface of the inner cylinder 5 is provided with a convex column 9, which is used to connect the various inner cylinders 5. When the inner cylinder 5 on the top layer is rotated, the inner cylinders on the lower layer can be driven to rotate.

[0028] In the preferred technical solution, bearings 6 are embedded in the outer circumferential surfaces of the convex ring platforms on the upper and lower end surfaces of the inner cylinder 5. The outer ring of the bearing 6 is connected to the inner wall of the outer cylinder 1 by interference fitting, which facilitates the smooth rotation of the inner cylinder 5.

[0029] In the preferred technical solution, a rotating part 2 is provided on the top of the topmost inner cylinder 5, a convex rod is provided on the bottom surface of the rotating part 2, and a through hole for the optical fiber 3 to pass through is provided in the middle of the rotating part 2. The rotating part 2 can rotate the top inner cylinder, thereby driving the inner cylinder of the lower layer to rotate, and a through hole for the optical fiber 3 to pass through is provided in the middle of the rotating part.

[0030] In the preferred technical solution, the outer diameter of the inner cylinder 5 is 1 mm smaller than the inner hole diameter of the outer cylinder 1, which facilitates the rotation of the inner cylinder 5. The number and size of the vertical grooves A101 and B501 are consistent, which is conducive to the optical fiber line to fully sense the temperature in the shallow geothermal area.

[0031] To sum up, the optical fiber line 3 cooperates with the optical information transceiver 4 to monitor geothermal energy using the principle of distributed optical fiber temperature measurement technology. By quickly splicing multiple outer tubes and inner tubes vertically, the optical fiber line 3 is externally protected to improve the durability and stability of the optical fiber line 3. The inner tubes can rotate with each other so that the vertical groove B501 is aligned with the vertical groove A101. The vertical groove cooperates with the through hole of the hollow tube to protect the optical fiber line 3 externally and avoid the problem of temperature measurement errors caused by a closed environment.

Claims

1. A shallow geothermal energy monitoring device, characterized by: The invention comprises an outer cylinder (1), an inner cylinder (5) rotatably arranged inside the outer cylinder (1), a hollow tube (8) connected to the inner part of the inner cylinder (5) via a bracket (801), an optical fiber (3) arranged in the middle of the hollow tube (8), and the optical fiber (3) connected to the optical information transceiver (4), a plurality of vertical grooves A (101) are formed at equal angles on the outer circumferential surface of the outer cylinder (1), and a plurality of vertical grooves B (501) are formed at equal angles on the outer circumferential surface of the inner cylinder (5).

2. A shallow geothermal energy monitoring device according to claim 1, characterized in that: The upper and lower end surfaces of the outer cylinder (1) are integrally formed with flanges (102). There are a plurality of outer cylinders (1), and the plurality of outer cylinders (1) are stacked vertically and fastened together by bolts.

3. A shallow geothermal energy monitoring device according to claim 2, characterized in that: The upper and lower end surfaces of the inner cylinder (5) are integrally formed with a convex ring platform (502), the convex ring platform surface of the upper end surface of the inner cylinder (5) is provided with a concave hole (7), and the convex ring platform surface of the lower end surface of the inner cylinder (5) is provided with a convex column (9).

4. A shallow geothermal energy monitoring device according to claim 3, characterized in that: The outer circumferential surfaces of the convex ring platforms on the upper and lower end surfaces of the inner cylinder (5) are both inlaid with bearings (6), and the outer ring of the bearing (6) is connected to the inner wall of the outer cylinder (1) by interference fitting.

5. The shallow geothermal energy monitoring device according to claim 3, characterized in that: A rotating member (2) is provided on the top of the inner cylinder (5) at the top end, a convex rod is provided on the bottom surface of the rotating member (2), and a through hole for the optical fiber (3) to pass through is provided in the middle of the rotating member (2).

6. The shallow geothermal energy monitoring device according to claim 1, characterized in that: The outer diameter of the inner cylinder (5) is 1 mm smaller than the inner diameter of the outer cylinder (1), and the number and size of the vertical grooves A (101) and B (501) are consistent.

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