Geothermal temperature measuring device

Abstract

The utility model discloses a geothermal temperature measuring device which comprises a drill rod, a driving rotating shaft which is arranged in the drill rod and is coaxial with the drill rod, a plurality of first bevel gears are uniformly arranged in the axial direction of the driving rotating shaft, a plurality of detection holes are formed in the side wall of the drill rod, and driving screw rods are arranged in the detection holes. A second bevel gear meshed with the first bevel gear is arranged at one end of the driving screw rod, a moving block is in threaded fit with the driving screw rod, and the moving block is connected with a temperature detector located at an outer side port of the detection hole through a plurality of connecting rods; according to the scheme, after a drill rod drills into an underground soil layer, a driving motor can drive a driving rotating shaft to rotate, and a driving screw rod rotates under the transmission action of a plurality of first bevel gears and second bevel gears, so that a moving block is driven to move in the axial direction of the driving screw rod; and the moving block can push the temperature detector to extend out of the detection hole and be inserted into the soil layer through a plurality of connecting rods, so that the temperature detection of the underground soil layer is realized.

Description

Technical Field

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

[0002] Geothermal measurement is a method of determining the temperature and heat flow at the same depth in the shallow layer, and making profiles and plane diagrams of isotherms and heat flux density to solve problems in hydrogeology, structure, minerals, coal fields, oil, natural gas and engineering geology. Geothermal measurement is of great significance in geothermal investigations. Since the heat in geothermal anomaly areas can continuously diffuse to the surface through conduction, measuring the temperature and natural heat flow at a certain depth underground can delineate the geothermal anomaly area and roughly infer the distribution range of groundwater.

[0003] The measurement environment of geothermal exploration is mostly underground, such as tunnels, wells, and the bottom of the ocean. When conducting geothermal exploration, it is necessary to lower a geothermal measuring device into a shallow well 10 to 30 meters or 50 to 100 meters underground to measure the geothermal gradient of the soil layer temperature. The geothermal gradient refers to the rate of temperature change as the drilling depth increases, and the geothermal gradient is the basic data for studying the geothermal field and calculating the heat flux density.

[0004] Existing geothermal measurement devices have certain drawbacks when used. It is necessary to drill a hole first, then pull out the drill rig, insert the measuring pipe, and then lower a single temperature sensor to different detection depths for detection. The process is cumbersome and the measurement efficiency is low. In addition, the temperature sensor is not in contact with the soil layer, resulting in large errors in the detection data of the soil layer temperature. Utility Model Content

[0005] In view of the above-mentioned deficiencies in the prior art, the utility model provides a geothermal temperature measuring device, which solves the problems of complicated operation, low efficiency and large measurement error in the prior art geothermal gradient measurement.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A geothermal temperature measuring device is provided, which includes a drill rod with a hollow interior, a driving shaft coaxially arranged with the drill rod is arranged inside the drill rod, a plurality of first bevel gears are evenly arranged in the axial direction of the driving shaft, a plurality of detection holes corresponding to the positions of the first bevel gears are arranged on the side wall of the drill rod, and the plurality of detection holes are all located in the radial direction of the drill rod, a driving screw is arranged in the detection hole, a second bevel gear meshing with the first bevel gear is arranged at one end of the driving screw, a moving block is threadedly matched on the driving screw, and the moving block is connected to a temperature detector located at an outer port of the detection hole through a plurality of connecting rods.

[0008] Furthermore, two bearing seats are provided in the detection hole to limit the ends of the driving screw rod respectively, and a plurality of limit holes for the connecting rod to pass through are provided on the bearing seat between the moving block and the temperature detection head.

[0009] Furthermore, the temperature detector includes a measuring cylinder, the outer wall of the measuring cylinder is slidably fitted with the inner wall of the detection hole, the inner end of the measuring cylinder is connected to a plurality of connecting rods, the outer end of the measuring cylinder is provided with a cone head, and a temperature probe is embedded on the outer wall of the measuring cylinder.

[0010] Furthermore, the plurality of detection holes are evenly arranged in the axial direction and the circumferential direction of the drill pipe side wall, and the second bevel gears in the plurality of detection holes in the same circumferential direction are all meshed with the first bevel gears at corresponding positions.

[0011] Furthermore, the upper end of the driving shaft is transmission-connected to the driving motor, and a thrust ball bearing abutting against the lower end of the driving shaft and a limit bearing for sleeve-mounting the driving shaft are arranged in the drill rod.

[0012] Furthermore, a spiral blade is arranged on the outer wall of the drill rod, and a conical drill bit is arranged at the lower end of the drill rod.

[0013] The beneficial effects of the utility model are:

[0014] 1. In this scheme, when the drill rod is drilled into the underground soil layer, the driving motor can be used to drive the driving shaft to rotate, and under the transmission action of a plurality of first bevel gears and second bevel gears, the driving screw is rotated, thereby driving the moving block to move along the axial direction of the driving screw, and the moving block can push the temperature detector out of the detection hole and insert it into the soil layer through a plurality of connecting rods, thereby realizing the temperature detection of the underground soil layer.

[0015] 2. Each detection hole in this scheme is a temperature detection point. Among them, several detection holes evenly arranged in the axial direction enable this scheme to simultaneously realize the geothermal gradient measurement at different depths; and several detection holes evenly arranged in the circumferential direction enable this scheme to measure the soil layer temperature at different circumferential positions of the borehole at the same depth, thereby increasing the number of detections and reducing the measurement error of the temperature sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the geothermal temperature measurement device.

[0017] Figure 2 for Figure 1 sectional view of .

[0018] Figure 3 for Figure 2 Magnified view of area A.

[0019] Among them, 1. drill rod, 2. driving shaft, 3. first bevel gear, 4. detection hole, 5. driving screw, 6. second bevel gear, 7. moving block, 8. connecting rod, 9. bearing seat, 10. limiting hole, 11. measuring cylinder, 12. cone head, 13. temperature probe, 14. driving motor, 15. thrust ball bearing, 16. limiting bearing, 17. spiral blade, 18. conical drill bit. DETAILED DESCRIPTION

[0020] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0021] like Figures 1 to 3 As shown, the geothermal temperature measuring device of the present scheme includes a drill rod 1 with a hollow interior, a spiral blade 17 is arranged on the outer wall of the drill rod 1, and a conical drill bit 18 is arranged at the lower end of the drill rod 1. During implementation, the drill rod 1 is screwed into the borehole through an external drilling drive device; a driving shaft 2 coaxially arranged with the drill rod 1 is arranged inside the drill rod 1, and the upper end of the driving shaft 2 is connected to the driving motor 14 for transmission, and a thrust ball bearing 15 abutting the lower end of the driving shaft 2 and a limit bearing 16 for sleeve-mounting the driving shaft 2 are arranged inside the drill rod 1, wherein the limit bearing 16 enables the driving shaft 2 to rotate smoothly, and the thrust ball bearing 15 can bear the axial load of the driving shaft 2.

[0022] A plurality of first bevel gears 3 are evenly arranged in the axial direction of the driving shaft 2, and a plurality of detection holes 4 corresponding to the positions of the first bevel gears 3 are arranged on the side wall of the drill rod 1. The plurality of detection holes 4 are evenly arranged in the axial and circumferential directions of the side wall of the drill rod 1, and the plurality of detection holes 4 are all located in the radial direction of the drill rod 1. A driving screw 5 is arranged in each detection hole 4, and a second bevel gear 6 is arranged at one end of the driving screw 5. The second bevel gears 6 in the plurality of detection holes 4 located in the same circumferential direction are all meshed with the first bevel gear 3 at the corresponding position. A moving block 7 is threadedly fitted on the driving screw 5, and the moving block 7 is connected to a temperature detector located at the outer port of the detection hole 4 through a plurality of connecting rods 8.

[0023] Two bearing seats 9 are provided in the detection hole 4, which are respectively limited and sleeved on the two ends of the driving screw rod 5. The bearing seat 9 located between the moving block 7 and the temperature detection head is provided with a plurality of limiting holes 10 for the connecting rod 8 to pass through. At the same time, the limiting holes 10 can limit the connecting rod 8 to prevent the connecting rod 8 and the moving block 7 from rotating with the driving screw rod 5.

[0024] In this scheme, after the drill rod 1 penetrates into the underground soil layer, the driving motor 14 can be used to drive the driving shaft 2 to rotate, and under the transmission action of the first bevel gears 3 and the second bevel gears 6, the driving screw 5 is rotated, thereby driving the moving block 7 to move along the axial direction of the driving screw 5, and the moving block 7 can push the temperature detector out of the detection hole 4 and insert it into the soil layer through the connecting rods 8, so as to realize the temperature detection of the underground soil layer; at the same time, each detection hole 4 of this scheme is a temperature detection point, among which the detection holes 4 are evenly arranged in the axial direction, so that the scheme can realize the geothermal gradient measurement of different depths at the same time; and the detection holes 4 are evenly arranged in the circumferential direction, so that the scheme can measure the soil layer temperature at different circumferential positions of the borehole at the same depth, thereby increasing the number of detection times and reducing the measurement error of the temperature sensor.

[0025] The temperature detector includes a measuring column 11, the outer wall of the measuring column 11 is slidably fitted with the inner wall of the detection hole 4, the inner end of the measuring column 11 is connected to a plurality of connecting rods 8, and the outer end of the measuring column 11 is provided with a cone head 12 to facilitate the insertion of the temperature detector into the soil layer; a temperature probe 13 is embedded on the outer wall of the measuring column 11, so that when the temperature detector is not extended, the temperature probe 13 is hidden in the detection hole 4, effectively avoiding extrusion damage to the geothermal detection head during the drilling process.

Claims

1. A geothermal temperature measuring device, characterized in that: It comprises a drill rod with a hollow interior, wherein a driving shaft coaxially arranged with the drill rod is arranged inside the drill rod, a plurality of first bevel gears are evenly arranged in the axial direction of the driving shaft, a plurality of detection holes corresponding to the positions of the first bevel gears are arranged on the side wall of the drill rod, and the plurality of detection holes are all located in the radial direction of the drill rod, a driving screw is arranged in the detection hole, a second bevel gear meshing with the first bevel gear is arranged at one end of the driving screw, a moving block is threadedly fitted on the driving screw, and the moving block is connected to a temperature detector located at the outer port of the detection hole through a plurality of connecting rods.

2. The geothermal temperature measuring device according to claim 1, characterized in that: Two bearing seats are arranged in the detection hole, which are respectively provided with limit sleeves on the two ends of the driving screw rod. The bearing seat located between the moving block and the temperature detection head is provided with a plurality of limit holes for the connecting rod to pass through.

3. The geothermal temperature measuring device according to claim 2, characterized in that: The temperature detector comprises a measuring cylinder, the outer wall of the measuring cylinder is slidably fitted with the inner wall of the detection hole, the inner end of the measuring cylinder is connected to a plurality of connecting rods, the outer end of the measuring cylinder is provided with a cone head, and the outer wall of the measuring cylinder is embedded with a temperature probe.

4. The geothermal temperature measuring device according to claim 1, characterized in that: The plurality of detection holes are evenly arranged in the axial direction and the circumferential direction of the drill pipe side wall, and the second bevel gears in the plurality of detection holes in the same circumferential direction are all meshed with the first bevel gears at corresponding positions.

5. The geothermal temperature measuring device according to claim 1, characterized in that: The upper end of the driving shaft is drivingly connected to the driving motor, and a thrust ball bearing abutting against the lower end of the driving shaft and a limit bearing for sleeve-mounting the driving shaft are arranged in the drill rod.

6. The geothermal temperature measuring device according to claim 1, characterized in that: The outer wall of the drill rod is provided with spiral blades, and the lower end of the drill rod is provided with a conical drill bit.

Images