Temperature measuring device used in geothermal well hole

Abstract

The utility model relates to the technical field of temperature measuring equipment, in particular to a temperature measuring device used in a geothermal well hole, which specifically comprises a rack, a winding and unwinding mechanism, a temperature measuring device, a plugging mechanism and a rotary driving mechanism. The temperature measuring device comprises a signal line, the winding and unwinding mechanism comprises a winding drum, the signal line is wound on the winding drum, and the winding drum is rotationally connected with the rack. The plugging mechanism comprises a sealing shell, a wheel shaft and an unwinding wheel. Through the design of the sealing part and the plug part, a signal line can smoothly pass through, reliable sealing of the ground temperature monitoring hole is realized, and liquid leakage is prevented; when the signal line is released, the driving wheel shaft rotates to pull the signal line to be released, the service life loss caused by large bending deformation quantity of the cable is avoided, the friction resistance between the signal line and the plug part can be reduced through the movable gap between the signal line and the threading channel, the defect that the signal line is released by depending on the gravity of a sensor traditionally is overcome, and stable unwinding of the signal line is achieved.

Description

Technical Field

[0001] This utility model relates to the field of temperature measuring equipment technology, and in particular to a temperature measuring device for geothermal well boreholes. Background Technology

[0002] In geothermal resource development, temperature measurement within geothermal wells using temperature measuring devices is a crucial step. These devices detect the well temperature, allowing workers to classify wells based on temperature and ensure safe operation. Currently, geothermal monitoring requires lowering a monitoring sensor through a monitoring hole to a predetermined depth within the well, and then connecting the sensor to surface equipment via a temperature measuring cable.

[0003] For example, patent CN221628131U discloses a temperature measuring device and a geothermal well for geothermal wells. The device uses a drive mechanism to rotate a rotating rod, which in turn rotates a rocker arm, connecting rod, and mounting sleeve, allowing a fiber optic temperature sensor to be lowered into the wellbore for temperature measurement. However, this device lacks a geothermal monitoring hole sealing device, which could cause the circulating liquid inside the geothermal well to leak outwards through the geothermal monitoring hole.

[0004] To address the leakage problem, patent CN218456172U discloses a sealing and fixing device for geothermal well temperature measuring cables. This device seals the geothermal monitoring hole with a plug, and the sheath and hook secure the temperature measuring cable. However, this device has a new problem: when the temperature measuring cable is unwound or rewound, the friction between it and the hook and sheath is significant. The sensor's descent relies on its own gravity; if the gravity is low, it may not descend easily due to the inability to overcome friction; if the gravity is high, the labor intensity during rewinding is high. Furthermore, the temperature measuring cable is partially wrapped around the hook, resulting in significant bending deformation at the wrapping point during movement, affecting the cable's lifespan.

[0005] Therefore, there is an urgent need for a temperature measuring device that can effectively block the ground temperature monitoring hole, reduce the friction of the temperature measuring signal line during take-up and take-down, and achieve power-assisted take-up and take-down. Utility Model Content

[0006] To address the shortcomings of existing technologies, this application provides a temperature measuring device for use in geothermal wells, which solves problems such as poor sealing of the wellhead, high friction during the winding and unwinding of the temperature measuring signal line, and low winding and unwinding efficiency.

[0007] To achieve the above objectives, this utility model provides a temperature measuring device for geothermal well boreholes, including a frame, a winding and unwinding mechanism, a temperature measuring device, a sealing mechanism, and a rotary drive mechanism.

[0008] The temperature measuring device includes a signal line, and the winding and unwinding mechanism includes a drum for winding and unwinding the signal line. The signal line is wound and installed on the drum, and the drum is rotatably connected to the frame.

[0009] The sealing mechanism includes a sealing housing, axles, and unwinding reels. A plug is located at the bottom of the sealing housing to seal the geothermal monitoring hole. A sealing section is located at the top of the sealing housing. The plug has a wire-passing channel communicating with the inner cavity of the sealing housing. The signal wire passes through the sealing section and enters the inner cavity of the sealing housing, then exits through the wire-passing channel. There is a movable gap between the signal wire and the wire-passing channel. Two axles are rotatably mounted inside the sealing housing, each with an unwinding reel fixed to it. The signal wire is located between the two unwinding reels and abuts against their surfaces. A rotary drive mechanism can selectively drive the drum and axles to rotate. By abutting the unwinding reel against the signal wire, the signal wire is driven downwards into the geothermal well hole, allowing it to unwind. The movable gap between the signal wire and the wire-passing channel reduces friction during unwinding and rewinding, preventing difficulties and cable damage caused by excessive friction.

[0010] Preferably, the rotary drive mechanism includes a lifting and adjusting mechanism, a lifting frame, a worm gear reducer motor, an upper spline shaft, a lower spline shaft, a spline sleeve, an upper right-angle steering gear, and a lower right-angle steering gear. The worm gear reducer motor is fixedly mounted on the lifting frame, and the spline sleeve is rotatably mounted on the lifting frame. The output end of the worm gear reducer motor is connected to the spline sleeve via a transmission assembly. Both the upper and lower right-angle steering gears are fixedly mounted on the frame. The output end of the upper right-angle steering gear is connected to the drum, and the input end of the upper right-angle steering gear is connected to the upper spline shaft. The output end of the lower right-angle steering gear is connected to one of the upper spline shafts. Each wheel shaft is connected by a drive system. The input end of the lower right-angle steering gear is connected to the lower spline shaft. The upper spline shaft, lower spline shaft, and spline sleeve are coaxially arranged. The lifting adjustment mechanism drives the lifting frame to rise and fall. When the lifting frame rises to the upper dead point, the spline sleeve is keyed to the upper spline shaft. At this time, the power of the worm gear reducer motor is transmitted to the upper right-angle steering gear through the spline sleeve and the upper spline shaft, driving the drum to rotate and realize the winding of the signal line. When the lifting frame falls to the lower dead point, the spline sleeve is keyed to the lower spline shaft. At this time, the power of the worm gear reducer motor is transmitted to the lower right-angle steering gear, driving the wheel shaft to rotate and causing the unwinding wheel to release the auxiliary signal line.

[0011] Preferably, the lifting adjustment mechanism includes a screw, a nut seat, and a handle. The screw is rotatably connected to the frame, the nut seat is threadedly connected to the screw, the nut seat is fixedly connected to the lifting frame, and the handle is fixedly mounted on the screw. By rotating the handle, the screw is driven to rotate, causing the nut seat to move the lifting frame up and down, thus realizing the switching of the transmission connection between the spline sleeve and the upper or lower spline shaft, or the lower spline shaft, which is easy to operate.

[0012] Preferably, a gear is fixed on the axle, and the gears on the two axles are meshed together. The gears ensure that the two unwinding wheels rotate synchronously, stably driving the signal line.

[0013] Preferably, a rotary dynamic seal is installed on the sealing housing, and the wheel axle is rotary sealed to the sealing housing through the rotary dynamic seal to prevent the circulating liquid in the geothermal well from leaking from the sealing part.

[0014] Preferably, a sealing ring is installed on the inner side of the sealing part, and the signal line is slidably sealed to the sealing part through the sealing ring.

[0015] Preferably, the frame is equipped with a rotating communication device and a monitoring device, and one end of the signal line is connected to the monitoring device for communication through the rotating communication device.

[0016] Preferably, the signal line is an optical fiber, and the rotating communication device is an optical fiber slip ring.

[0017] Preferably, the signal line is a cable, and the rotating communication device is an electric slip ring.

[0018] Preferably, the temperature measuring device further includes a temperature sensor, which is connected to the free end of the signal line.

[0019] Compared with existing technologies, this technical solution has at least one of the following beneficial effects:

[0020] 1. The design of the sealing part and the plug head not only ensures that the signal line passes through smoothly, but also achieves a reliable seal of the ground temperature monitoring hole to prevent liquid leakage; the unwinding wheel abuts against the signal line, changing the traditional hanging fixation to a rolling support, which greatly reduces the friction of winding and unwinding, and avoids the life loss of the cable due to large bending deformation.

[0021] 2. When lowering the signal line, the signal line is pulled down by rotating the drive wheel axle. The movement gap between the signal line and the threading channel can reduce the frictional resistance between the signal line and the end cap, overcoming the shortcomings of the traditional method of relying on the sensor for gravity lowering, and realizing the stable unwinding of the signal line. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a geothermal well borehole temperature measuring device according to an embodiment of the present invention;

[0023] Figure 2 for Figure 1 A sectional view along line AA.

[0024] Figure 3 This is a schematic diagram of the internal structure of a sealing mechanism according to an embodiment of the present invention;

[0025] In the diagram, 1. Frame; 2. Unwinding / rewinding mechanism; 21. Drum; 22. Baffle; 3. Temperature measuring device; 31. Signal line; 32. Rotary communication device; 33. Monitoring equipment; 34. Temperature sensor; 4. Sealing mechanism; 41. Sealing housing; 411. Plug head; 412. Sealing part; 413. Threading channel; 414. Sealing ring; 42. Axle; 43. Unwinding wheel; 44. Gear; 45. Rotary dynamic seal; 5. Rotary drive mechanism; 51. Lifting and adjusting mechanism; 511. Screw; 512. Nut seat; 513. Handle; 52. Lifting frame; 53. Worm gear reducer motor; 54. Upper splined shaft; 55. Lower splined shaft; 56. Splined sleeve; 57. Upper right-angle steering gear; 58. Lower right-angle steering gear. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0027] Please see Figures 1 to 3 This application provides a temperature measuring device for geothermal well boreholes, including a frame 1, a winding and unwinding mechanism 2, a temperature measuring device 3, a sealing mechanism 4, and a rotary drive mechanism 5.

[0028] The temperature measuring device 3 includes a signal line 31, and the winding and unwinding mechanism 2 includes a drum 21 for winding and unwinding the signal line 31 and two baffles 22 fixed on the drum 21. The signal line 31 is wound and installed on the drum 21 and located between the two baffles 22. The drum 21 is rotatably connected to the frame 1 through a bearing. One end of the drum 21 is provided with a round hole for the signal line 31 to extend out, so that the signal line 31 can transmit signals to the monitoring device 33.

[0029] The sealing mechanism 4 includes a sealing housing 41, a wheel axle 42, and a reel 43. The sealing housing 41 has a plug head 411 at its bottom, which is a hollow cylindrical protrusion. The plug head 411 is inserted into the ground temperature monitoring hole to seal it. The sealing housing 41 has a sealing part 412 at its top, which is also a hollow cylindrical protrusion. The plug head 411 has a wire-passing channel communicating with the inner cavity of the sealing housing 41. 413, the wire-passing channel 413 is the hollow structure of the plug head 411. The signal line 31 passes through the sealing part 412 and enters the inner cavity of the sealing housing 41, and then exits the sealing housing 41 through the wire-passing channel 413. There is a movable gap between the signal line 31 and the wire-passing channel 413. Two axles 42 are rotatably and sealed inside the sealing housing 41. Each axle 42 is fixed with a unwinding wheel 43. The signal line 31 is located between the two unwinding wheels 43 and abuts against the wheel surface of the unwinding wheel 43. The rotary drive mechanism 5 can selectively drive the drum 21 and the axles 42 to rotate.

[0030] By contacting the unwinding wheel 43 with the signal line 31, the signal line 31 can be driven downward into the geothermal well hole, so that the signal line 31 is unwound. The movable gap between the signal line 31 and the wire passage 413 can reduce the friction of the signal line 31 during winding and unwinding, and avoid the problems of winding and unwinding difficulties and cable damage caused by excessive friction.

[0031] During operation, the plug is inserted into the geothermal well hole, and the rotary drive mechanism 5 selectively drives the wheel axle 42 to rotate, so that the unwinding wheel 43 pulls the signal line 31 to unwind. The signal line 31 has little resistance in the wire passage 413 and can be smoothly lowered into the geothermal well hole under the drive of the unwinding wheel 43.

[0032] Signal line 31 transmits the temperature signal to the receiving equipment above the well. Because the plug seals the geothermal well borehole, the circulating liquid inside the geothermal well borehole may enter the sealing housing 41 through the geothermal monitoring hole, but it will not leak outwards.

[0033] After the temperature measurement is completed, the winding signal line 31 and the rotary drive mechanism 5 selectively drive the drum 21 to rotate. The drum 21 winds up the signal line 31, and the unwinding wheel 43 rotates with the winding of the signal line 31 without affecting the winding of the signal line 31.

[0034] In some embodiments, the rotary drive mechanism 5 includes a lifting adjustment mechanism 51, a lifting frame 52, a worm gear reducer motor 53, an upper spline shaft 54, a lower spline shaft 55, a spline sleeve 56, an upper right-angle steering gear 57, and a lower right-angle steering gear 58. Both the upper right-angle steering gear 57 and the lower right-angle steering gear 58 are bevel gear right-angle steering gears.

[0035] The worm gear reducer motor 53 is fixedly mounted on the lifting frame 52, and the spline sleeve 56 is rotatably mounted on the lifting frame 52 via bearings. The output end of the worm gear reducer motor 53 is connected to the spline sleeve 56 via a chain drive assembly. The chain drive assembly specifically consists of a drive sprocket mounted on the output end of the worm gear reducer motor 53, a driven sprocket mounted on the spline sleeve 56, and a drive chain connecting the drive sprocket and the driven sprocket.

[0036] Both the upper right-angle steering gear 57 and the lower right-angle steering gear 58 are fixedly mounted on the frame 1. The output end of the upper right-angle steering gear 57 is connected to the drum 21 for transmission, and the input end of the upper right-angle steering gear 57 is connected to the upper spline shaft 54 ​​for transmission via a coupling. The output end of the lower right-angle steering gear 58 is connected to one of the wheel axles 42 for transmission, and the input end of the lower right-angle steering gear 58 is connected to the lower spline shaft 55 for transmission via a coupling. The upper spline shaft 54, the lower spline shaft 55, and the spline sleeve 56 are coaxially arranged. The wheel axle 42 connected to the output end of the lower right-angle steering gear 58 is located directly below the drum 21.

[0037] The lifting adjustment mechanism 51 drives the lifting frame 52 to rise and fall. When the lifting frame 52 rises to the upper dead point, the spline sleeve 56 is keyed to the upper spline shaft 54. At this time, the power of the worm gear reducer motor 53 is transmitted to the upper right angle steering gear 57 through the spline sleeve 56 and the upper spline shaft 54, which drives the drum 21 to rotate and realize the winding of the signal line 31. When the lifting frame 52 falls to the lower dead point, the spline sleeve 56 is keyed to the lower spline shaft 55. At this time, the power of the worm gear reducer motor 53 is transmitted to the lower right angle steering gear 58, which drives the wheel axle 42 to rotate and causes the unwinding wheel 43 to lower the signal line 31.

[0038] Both the upper right-angle steering gear 57 and the lower right-angle steering gear 58 can function as power transmission and direction conversion devices. The worm gear reducer motor 53 has a self-locking function. When the worm gear reducer motor 53 stops working, it can prevent the drum 21 from rotating on its own due to the weight of the signal line 31 or the downhole resistance, ensuring that the temperature sensor 34 remains stably at the target depth and avoiding data fluctuations or equipment damage.

[0039] In some embodiments, please refer to Figure 1 The lifting and adjusting mechanism 51 includes a screw 511, a nut seat 512, and a handle 513. The screw 511 is rotatably connected to the frame 1, the nut seat 512 is threadedly connected to the screw 511, and the nut seat 512 is fixedly connected to the lifting frame 52. The handle 513 is fixedly mounted on the screw 511. By rotating the handle 513, the screw 511 is driven to rotate, causing the nut seat 512 to drive the lifting frame 52 to rise and fall, thereby realizing the switching of the transmission connection between the spline sleeve 56 and the upper or lower spline shaft 55, or the lower spline shaft 55. The operation is simple.

[0040] The frame 1 is provided with a movable opening, and the lifting frame 52 is slidably connected to the movable opening. The frame 1 plays a guiding role for the lifting frame 52, so that when the nut seat 512 moves on the screw 511, it can drive the lifting frame 52 to move up and down linearly within the movable opening.

[0041] In some other embodiments, the lifting adjustment mechanism 51 may also be replaced by an electric cylinder, a pneumatic cylinder, or a hydraulic cylinder.

[0042] In some embodiments, please refer to Figure 1 and Figure 3 A gear 44 is fixed on the axle 42, and the gears 44 on the two axles 42 are meshed together. The gear 44 ensures that the two unwinding wheels 43 rotate synchronously, and stably drives the signal line 31.

[0043] In some embodiments, please refer to Figure 3 A rotary dynamic seal 45 and a bearing are installed on the sealing housing 41. The wheel axle 42 is rotary sealed to the sealing housing 41 via the rotary dynamic seal 45 to prevent the circulating liquid in the geothermal well from leaking from the sealing part 412. The rotary dynamic seal 45 is a mechanical seal or a packing seal. The wheel axle 42 is rotatably connected to the sealing housing 41 via the bearing, while ensuring smooth rotation of the wheel axle 42.

[0044] A sealing ring 414 is installed inside the sealing part 412, and the signal line 31 is slidably and sealingly connected to the sealing part 412 through the sealing ring 414. The sealing ring 414 can seal the sliding connection between the signal line 31 and the sealing part 412, preventing water leakage from the sealing part 412. The sealing ring 414 is made of materials such as nitrile rubber or fluororubber, and the sealing ring 414 is an O-ring.

[0045] In some embodiments, please refer to Figures 1 to 3 To facilitate receiving signals transmitted by signal line 31, a rotating communication device 32 and a monitoring device 33 are installed on the frame 1. One end of signal line 31 is connected to the monitoring device 33 through the rotating communication device 32.

[0046] Signal line 31 can be an optical fiber or a cable.

[0047] When the signal line 31 is an optical fiber, the rotating communication device 32 is an optical fiber slip ring.

[0048] When signal line 31 is a distributed optical fiber for temperature measurement, the optical fiber itself acts as a sensor, eliminating the need for an additional temperature sensor 34. By utilizing the light scattering effect in the optical fiber and analyzing the changes in the characteristics of backscattered light with temperature, continuous temperature measurement along the entire length of the optical fiber can be achieved. In this scheme, the optical fiber itself is both a signal transmission medium and a temperature-sensitive element. Each tiny segment of the entire optical fiber can be regarded as a virtual sensor, eliminating the need to install discrete sensor nodes on the optical fiber. The optical fiber transmits the signal to the monitoring device through an optical fiber slip ring.

[0049] When the signal line 31 is an optical fiber used only as a signal transmission channel, a temperature sensor 34 is also required. The temperature measuring device 3 includes the signal line 31 and the temperature sensor 34, which is connected to the free end of the signal line 31. The temperature sensor 34 is a fiber Bragg grating sensor or a fiber optic fluorescent temperature sensor, which converts the temperature signal into an optical signal through the optical fiber and then transmits it to the monitoring equipment through an optical fiber slip ring.

[0050] When the signal line 31 is a cable and the rotating communication device 32 is an electric slip ring, a temperature sensor 34 is also required. The temperature measuring device 3 includes the signal line 31 and the temperature sensor 34, which is connected to the free end of the signal line 31. The temperature sensor 34 is an electrical signal transmission temperature sensor that converts the temperature signal into an electrical signal for transmission and measurement. Thermocouple temperature sensors, resistance temperature sensors, semiconductor integrated temperature sensors, and thermistor temperature sensors can be used to meet the needs of different temperature measurement technologies.

[0051] A monitoring device 33 can be composed of a data acquisition module and a microcontroller such as the STM32 series. Taking a thermocouple sensor as an example, the data acquisition module first amplifies and filters the weak thermoelectric potential signal output by the sensor, and then converts the analog signal into a digital signal through an A / D converter, which is then transmitted to the microcontroller. The microcontroller converts the digital signal into the actual temperature value according to the thermocouple calibration table. Finally, an external LCD screen can be connected, and the microcontroller controls the screen to display the temperature information intuitively; alternatively, data can be transmitted to a remote monitoring terminal through communication interfaces such as serial port and Ethernet to achieve remote display and monitoring.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0054] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A temperature measuring device for geothermal well boreholes, characterized in that, The system includes a frame (1), a winding and unwinding mechanism (2), a temperature measuring device (3), a sealing mechanism (4), and a rotary drive mechanism (5). The temperature measuring device (3) includes a signal line (31). The winding and unwinding mechanism (2) includes a drum (21) for winding and unwinding the signal line (31). The signal line (31) is wound and installed on the drum (21), and the drum (21) is rotatably connected to the frame (1). The sealing mechanism (4) includes a sealing housing (41), a wheel axle (42), and an unwinding wheel (43). The sealing housing (41) has a plug head (411) at the bottom and a sealing part (412) at the top. The plug head (411) has a... There is a wire passage (413) communicating with the inner cavity of the sealed housing (41). The signal line (31) passes through the sealing part (412) and enters the inner cavity of the sealed housing (41), and exits the sealed housing (41) through the wire passage (413). There is a movable gap between the signal line (31) and the wire passage (413). Two axles (42) are installed in the sealed housing (41) for rotational sealing. Each axle (42) is fixed with a unwinding wheel (43). The signal line (31) is located between the two unwinding wheels (43) and abuts against the wheel surface of the unwinding wheel (43). The rotary drive mechanism (5) can selectively drive the drum (21) and the axle (42) to rotate.

2. The temperature measuring device for geothermal well boreholes according to claim 1, characterized in that, The rotary drive mechanism (5) includes a lifting adjustment mechanism (51), a lifting frame (52), a worm gear reducer motor (53), an upper spline shaft (54), a lower spline shaft (55), a spline sleeve (56), an upper right-angle steering gear (57), and a lower right-angle steering gear (58). The worm gear reducer motor (53) is fixedly mounted on the lifting frame (52), and the spline sleeve (56) is rotatably mounted on the lifting frame (52). The output end of the worm gear reducer motor (53) is connected to the spline sleeve (56) through a transmission assembly. The upper right-angle steering gear (57) and the lower right-angle steering gear (58) are both fixedly mounted on the frame (1). The upper right-angle steering gear (57) outputs... The upper right-angle steering gear (57) is connected to the upper spline shaft (54) via transmission. The lower right-angle steering gear (58) is connected to one of the wheel axles (42) via transmission. The lower right-angle steering gear (58) is connected to the lower spline shaft (55) via transmission. The upper spline shaft (54), the lower spline shaft (55), and the spline sleeve (56) are coaxially arranged. The lifting adjustment mechanism (51) drives the lifting frame (52) to rise and fall. When the lifting frame (52) rises to the upper dead point, the spline sleeve (56) is keyed to the upper spline shaft (54). When the lifting frame (52) falls to the lower dead point, the spline sleeve (56) is keyed to the lower spline shaft (55).

3. The temperature measuring device for geothermal well boreholes according to claim 2, characterized in that, The lifting adjustment mechanism (51) includes a screw (511), a nut seat (512) and a handle (513). The screw (511) is rotatably connected to the frame (1), the nut seat (512) is threadedly connected to the screw (511), the nut seat (512) is fixedly connected to the lifting frame (52), and the handle (513) is fixedly installed on the screw (511).

4. The temperature measuring device for geothermal well boreholes according to claim 2, characterized in that, A gear (44) is fixed on the axle (42), and the gears (44) on the two axles (42) are meshed together.

5. The temperature measuring device for geothermal well boreholes according to claim 2, characterized in that, A rotary dynamic seal (45) is installed on the sealing housing (41), and the axle (42) is rotary sealed to the sealing housing (41) through the rotary dynamic seal (45).

6. The temperature measuring device for geothermal well boreholes according to claim 2, characterized in that, A sealing ring (414) is installed inside the sealing part (412), and the signal line (31) is slidably sealed to the sealing part (412) through the sealing ring (414).

7. The temperature measuring device for geothermal well boreholes according to claim 1, characterized in that, The frame (1) is equipped with a rotating communication device (32) and a monitoring device (33). One end of the signal line (31) is connected to the monitoring device (33) through the rotating communication device (32).

8. The temperature measuring device for geothermal well boreholes according to claim 7, characterized in that, The signal line (31) is an optical fiber, and the rotating communication device (32) is an optical fiber slip ring.

9. The temperature measuring device for geothermal well boreholes according to claim 7, characterized in that, The signal line (31) is a cable, and the rotating communication device (32) is an electric slip ring.

10. The temperature measuring device for geothermal well boreholes according to claim 8 or 9, characterized in that, The temperature measuring device (3) also includes a temperature sensor (34), which is connected to the free end of the signal line (31).

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