A special monitoring device for geothermal heat in winter in the northern cold regions

Abstract

The present invention discloses a special monitoring device for geothermal heat in winter in the severely cold regions of northern China, comprising an outer cylinder, which is a sealed cylindrical body with a plurality of expansion bladders distributed around its outer wall. A central axis is provided at the center of the outer cylinder, and a probe is fixed at the lower end of the central axis. A wire is connected to the top of the outer cylinder, a pull rope is connected to the bottom of the outer cylinder, and a counterweight is fixed below the pull rope. The two ends of the expansion bladder are connected to the two ends of the outer cylinder through a chute, one end of the chute is fixed in the outer cylinder and extends radially outward from the outer cylinder, and the two ends of the expansion bladder are slidably connected to the chute via sliders. Compared with the prior art, the present invention can provide better support and cushioning, and the probe can be prevented from being damaged during the descent process, and has good stability.

Description

Technical Field

[0001] The present invention relates to the technical field of geothermal monitoring equipment, in particular to a special geothermal monitoring device for winter in severely cold northern regions. Background Art

[0002] Geothermal energy is clean, environmentally friendly, and renewable, with abundant reserves. It has been widely used in urban and rural clean energy heating, bathing, planting, and breeding. Geothermal monitoring is a basic work in the development and utilization of geothermal resources. It is of great significance to understand the dynamic changes of heat reservoirs and their surrounding geological environment and to ensure the long-term sustainable development and utilization of resources. In the existing technology, temperature detection is carried out by placing temperature detection sensors in geothermal wells. However, it is impossible to obtain planar data within the geothermal distribution range, and it is impossible to obtain real-time original data related to geothermal water temperature loss, geothermal well wall temperature impact, cementing quality, etc. during geothermal drilling and development and utilization. By drilling multiple detection holes and conducting detection in the detection holes, more complete data can be obtained, but the sensors are easily damaged in the process of placing them in the detection holes, and the position and stability of the sensors are difficult to guarantee.

[0003] Therefore, it is necessary to provide a dedicated geothermal monitoring device for winter in the northern cold regions to solve the problems raised in the above background technology. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a dedicated geothermal monitoring device for winter in severely cold northern regions, comprising an outer cylinder, the outer cylinder being a sealed cylindrical body with a plurality of expansion bladders distributed around its outer wall, a central axis being provided at the center of the outer cylinder, and a probe being fixed at the lower end of the central axis;

[0005] A conducting wire is connected to the upper portion of the outer cylinder, a draw rope is connected to the lower portion of the outer cylinder, and a counterweight is fixed to the lower portion of the draw rope.

[0006] Furthermore, preferably, both ends of the expansion bag are connected to both ends of the outer tube through a slide groove, one end of the slide groove is fixed in the outer tube and extends radially outward along the outer tube, and both ends of the expansion bag are slidably connected to the slide groove through sliders respectively.

[0007] Furthermore, preferably, the expansion bladder is a bladder body made of elastic material, and the filler therein is polyvinylidene chloride.

[0008] Furthermore, preferably, the polyvinylidene chloride filler in the expansion bladder is in the shape of microspheres.

[0009] Furthermore, as a preference, the central shaft is slidably connected to the outer cylinder, and both ends of the central shaft can pass through both ends of the outer cylinder.

[0010] Furthermore, as a preference, a connecting rod is hinged on the slider above each of the expansion bladders, and the other ends of the connecting rods are hinged to the top of the central axis.

[0011] Furthermore, preferably, a sliding sleeve is fixed to the upper portion of the outer cylinder, the sliding sleeve is slidably connected to the central shaft, and a fixed sleeve is fixed to the central shaft inside the outer cylinder and below the sliding sleeve.

[0012] Furthermore, as a preference, a spring is sleeved in the central axis between the sliding sleeve and the fixed sleeve, and the spring provides elastic force to move the central axis upward until the probe is retracted into the outer cylinder.

[0013] Furthermore, as a preference, the drawstring is divided into multiple strands near one end of the outer tube, each strand passing through the edge of the outer tube and into the interior of the outer tube, and each strand of the drawstring is hooked into the connecting hook through a connecting ring;

[0014] The middle portion of the connecting hook is hinged to the inner wall of the outer cylinder, and a contact ball is fixed on the upper portion of the connecting hook, and the contact ball is located below the fixing sleeve.

[0015] Furthermore, as a preference, a concave pressure groove is opened at the lower end of the central shaft, and the pressure groove is connected to the probe, a pressure ball is provided in the pressure groove to seal it, and a position sensor is arranged in the pressure ball.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] In the present invention, the outer cylinder is guided into the detection hole under the action of the gravity of the counterweight block, and as the temperature rises, the expansion bag is heated and expanded, so that the outer cylinder is fixed in the detection hole. The heat-expandable microspheres made of polyvinylidene chloride and a foaming agent have an initial expansion temperature of at least 80°C. The initial expansion temperature is low and the volume expansion ratio is high, which can play a good supporting and buffering role.

[0018] In the present invention, when the expansion bladder is heated and expanded, it drives the slider to move away from the central axis, and the central axis is driven downward by the action of the connecting rod. When the expansion bladder is in the initial state, the height of the central axis causes the probe to retract into the outer tube. When the expansion bladder is heated and expanded, the central axis moves downward to cause the probe to extend out of the outer tube, thereby preventing the probe from being damaged during the descent process.

[0019] In the present invention, when the central axis moves down to the fixed sleeve and presses the contact ball, the connecting hook rotates around the hinge point, causing the connecting ring to separate from the connecting hook, thereby causing the counterweight block to separate from the outer cylinder, so as to prevent the counterweight block from generating axial force on the outer cylinder and affecting its stability when the outer cylinder is fixed in the detection hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1This is a schematic diagram of the three-dimensional structure of a special geothermal monitoring device for winter in the northern cold regions;

[0021] Figure 2 This is a schematic diagram of the cross-sectional structure of a special geothermal monitoring device for use in cold northern regions in winter.

[0022] In the figure: 1. Outer cylinder; 2. Expansion bladder; 3. Central axis; 4. Probe; 5. Wire; 6. Pull rope; 7. Counterweight; 8. Slide groove; 9. Slider; 10. Connecting rod; 11. Connecting hook; 12. Connecting ring; 13. Contact ball; 31. Sliding sleeve; 32. Fixed sleeve; 33. Spring; 34. Pressure groove; 35. Pressure ball. DETAILED DESCRIPTION

[0023] See also Figure 1 and Figure 2 In an embodiment of the present invention, a dedicated geothermal monitoring device for use in cold northern regions in winter includes an outer cylinder 1, which is a sealed cylindrical body having a plurality of expansion bladders 2 distributed around its outer wall. A central axis 3 is provided at the center of the outer cylinder 1, and a probe 4 is fixed to the lower end of the central axis 3.

[0024] A conducting wire 5 is connected to the upper portion of the outer cylinder 1 , a pull rope 6 is connected to the lower portion of the outer cylinder 1 , and a counterweight 7 is fixed below the pull rope 6 .

[0025] The counterweight block 7 is a cement block. Under the action of the gravity of the counterweight block 7, the outer cylinder 1 is guided into the detection hole. As the temperature rises, the expansion bag 2 expands due to heat, so that the outer cylinder 1 is fixed in the detection hole, so that the geothermal temperature can be detected by the probe 4 and the data can be transmitted back to the ground through the wire 5.

[0026] In this embodiment, the two ends of the expansion bladder 2 are connected to the two ends of the outer tube 1 through a slide groove 8. One end of the slide groove 8 is fixed in the outer tube 1 and extends radially outward along the outer tube 1. The two ends of the expansion bladder 2 are slidably connected to the slide groove 8 through sliders 9, that is, as the expansion bladder 2 expands, its axis can change the distance from the outer tube 1.

[0027] In this embodiment, the expansion bladder 2 is made of an elastic material, and the filler therein is polyvinylidene chloride. Polyvinylidene chloride has stable chemical properties and a high thermal expansion coefficient, and is therefore well suited for use as a thermal expansion filler.

[0028] In this embodiment, the polyvinylidene chloride filler in the expansion bladder 2 is in the shape of microspheres. The heat-expandable microspheres made of polyvinylidene chloride and a foaming agent have a minimum initial expansion temperature of 80°C. The low initial expansion temperature and high volume expansion ratio can provide better support and cushioning effects.

[0029] In this embodiment, the central shaft 3 is slidably connected to the outer cylinder 1 , and both ends of the central shaft 3 can pass through both ends of the outer cylinder 1 .

[0030] In this embodiment, a connecting rod 10 is hinged on the slider 9 above each of the expansion bladders 2, and the other end of the connecting rod 10 is hinged to the top of the central shaft 3;

[0031] That is to say, when the expansion bladder 2 is heated and expanded, it drives the slider 9 to move away from the central axis 3, and drives the central axis 3 downward through the action of the connecting rod 10. When the expansion bladder 2 is in the initial state, the height of the central axis 3 causes the probe 4 to retract into the outer tube 1. When the expansion bladder 2 is heated and expanded, the central axis 3 moves downward to cause the probe 4 to extend out of the outer tube 1, thereby preventing the probe 4 from being damaged during the descent process.

[0032] In this embodiment, a sliding sleeve 31 is fixed to the upper portion of the outer cylinder 1 , and the sliding sleeve 31 is slidably connected to the central shaft 3 . A fixed sleeve 32 is fixed to the central shaft 3 below the sliding sleeve 31 in the outer cylinder 1 .

[0033] In this embodiment, a spring 33 is sleeved in the central shaft 3 between the sliding sleeve 31 and the fixed sleeve 32 . The spring 33 provides elastic force to move the central shaft 3 upward until the probe 4 is retracted into the outer tube 1 .

[0034] In this embodiment, the pull rope 6 is divided into multiple strands near the end of the outer tube 1 and passes through the outer tube 1 from the edge thereof, and each strand of the pull rope 6 is hooked into the connecting hook 11 through the connecting ring 12.

[0035] The middle portion of the connecting hook 11 is hinged to the inner wall of the outer tube 1 , and a contact ball 13 is fixed to the upper portion of the connecting hook 11 . The contact ball 13 is located below the fixing sleeve 32 .

[0036] Moreover, the bottom of the outer cylinder 1 can be disassembled.

[0037] That is to say, when the central axis 3 moves down to the fixed sleeve 32 and presses down the contact ball 13, the connecting hook 11 rotates around the hinge point, causing the connecting ring 12 to disengage from the connecting hook 11, thereby causing the counterweight 7 to disengage from the outer cylinder 1, so as to prevent the counterweight 7 from generating axial force on the outer cylinder 1 and affecting its stability when the outer cylinder 1 is fixed in the detection hole.

[0038] In this embodiment, a concave pressure groove 34 is opened at the lower end of the central shaft 3, and the pressure groove 34 is connected to the probe 4. A pressure ball 35 is installed in the pressure groove 34 to seal it, and a position sensor is installed in the pressure ball 35.

[0039] In specific implementation, the expansion bag 2 in the initial state is moved to a position where it fits in with the outer tube 1, and then the pull rope 6 and the counterweight 7 are installed at the bottom of the outer tube 1;

[0040] Drill a detection hole at the monitoring location. The diameter of the detection hole is slightly larger than the outer diameter of the expansion bladder 2. Place the detection device through the detection hole through the wire 5. Under the action of the gravity of the counterweight 7, guide the outer cylinder 1 into the detection hole. After the wire 5 is extended to an appropriate length, it is fixed.

[0041] As the temperature rises, the heat-expandable microspheres made of polyvinylidene chloride and a foaming agent expand, thereby expanding the expansion bag 2 and fixing the outer cylinder 1 in the detection hole;

[0042] When the expansion bladder 2 expands due to heat, it drives the slider 9 to move away from the central axis 3, and the central axis 3 is moved downward by the action of the connecting rod 10, so that the probe 4 extends out of the outer tube 1;

[0043] At the same time, when the central shaft 3 moves down to the fixed sleeve 32 and presses down the contact ball 13, the connecting hook 11 rotates around the hinge point, causing the connecting ring 12 to separate from the connecting hook 11, thereby separating the counterweight 7 from the outer cylinder 1, so that when the outer cylinder 1 is fixed in the detection hole, the counterweight 7 does not generate an axial force on it and affect its stability;

[0044] The probe 4 and the pressure ball 35 transmit the geothermal temperature and pressure data at the depth back to the surface via the wire 5 .

[0045] The above is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A special monitoring device for geothermal heat in winter in the northern cold regions, characterized by: The outer cylinder (1) is a closed cylindrical body, and a plurality of expansion bags (2) are distributed around the outer wall thereof. A central axis (3) is provided at the center of the outer cylinder (1), and a probe (4) is fixed at the lower end of the central axis (3). A conducting wire (5) is connected to the upper portion of the outer cylinder (1), a drawstring (6) is connected to the lower portion of the outer cylinder (1), and a counterweight (7) is fixed below the drawstring (6); The two ends of the expansion bag (2) are connected to the two ends of the outer cylinder (1) through a slide groove (8), one end of the slide groove (8) is fixed in the outer cylinder (1) and extends outward along the radial direction of the outer cylinder (1), and the two ends of the expansion bag (2) are slidably connected to the slide groove (8) through a slider (9) respectively; The central shaft (3) is slidably connected to the outer cylinder (1), and both ends of the central shaft (3) can pass through both ends of the outer cylinder (1); A connecting rod (10) is hingedly connected to the slider (9) above each expansion bag (2), and the other end of each connecting rod (10) is hingedly connected to the top of the central shaft (3); A sliding sleeve (31) is fixed to the upper portion of the outer cylinder (1), the sliding sleeve (31) is slidably connected to the central shaft (3), and a fixed sleeve (32) is fixed to the central shaft (3) below the sliding sleeve (31) within the outer cylinder (1); The draw rope (6) is divided into multiple strands near one end of the outer cylinder (1) and penetrates into the inner part of the outer cylinder (1) from the edge of the outer cylinder (1), and each strand of the draw rope (6) is hooked into the connecting hook (11) through the connecting ring (12); The middle portion of the connecting hook (11) is hinged to the inner wall of the outer cylinder (1), and a contact ball (13) is fixed to the upper portion of the connecting hook (11), and the contact ball (13) is located below the fixing sleeve (32).

2. The device for monitoring geothermal heat in northern cold regions in winter according to claim 1 is characterized in that: The expansion bladder (2) is a bladder body made of elastic material, and the filler therein is polyvinylidene chloride.

3. The device for monitoring geothermal heat in winter in the northern cold regions according to claim 2, characterized in that: The polyvinylidene chloride filler in the expansion bag (2) is in the shape of microspheres.

4. The device for monitoring geothermal heat in winter in northern cold regions according to claim 1 is characterized in that: A spring (33) is sleeved in the central shaft (3) between the sliding sleeve (31) and the fixed sleeve (32), and the spring (33) provides elastic force to move the central shaft (3) upward until the probe (4) is retracted into the outer cylinder (1).

5. The device for monitoring geothermal heat in northern cold regions in winter according to claim 1 is characterized in that: The lower end of the central shaft (3) is provided with an inwardly concave pressure groove (34), and the pressure groove (34) is connected to the probe (4). A pressure ball (35) is provided in the pressure groove (34) to seal the pressure groove, and a position sensor is provided in the pressure ball (35).

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