Hot rod temperature field simulation test device applied to extremely cold region

Abstract

The utility model relates to the technical field of hot rod temperature field simulation tests in extremely cold regions, in particular to a hot rod temperature field simulation test device applied to extremely cold regions, which is matched with a frozen soil layer simulation soil sample for use and comprises a test box for containing the frozen soil layer simulation soil sample and a plurality of hot rod units, the plurality of hot rod units are sequentially arranged along the length direction of the test box at intervals of one time, two times and four times of a fixed distance, and are used for testing the influence of the intervals of the hot rod units on the temperature field, so that the conditions of hot rod temperature fields with different intervals can be tested through the hot rod units arranged at different intervals, and the test efficiency is improved. Meanwhile, a conveying pipe and a wire sequentially penetrate through each hot rod unit from bottom to top, fluid in the conveying pipe can take away heat in soil layers with different depths, the effect brought by reducing the temperature of the soil layers is tested, and the wire is connected with sensors at different depths, so that the temperature of the soil layers with different depths is measured.

Description

Technical Field

[0001] The utility model relates to the technical field of heat rod temperature field simulation test in extremely cold areas, in particular to a heat rod temperature field simulation test device applied to extremely cold areas. Background Art

[0002] The existing cold region soil layer test device is generally mainly used to test the frost heave of the soil layer. The main measurement method is to measure based on the principle of water migration. As the moisture in the frozen area increases, the frost heave will also increase. Therefore, it is generally lowered through a multi-stage casing and fixed on pads at different depths. The frost heave and thaw settlement of the soil layer are measured by the laser displacement sensor on the casing. However, in the relevant tests of the temperature field of the cold region soil layer, it is necessary to rely on the fluid to adjust the temperature of the soil layer at each depth. At the same time, it is also necessary to ensure that the fluid can circulate smoothly in the device system and realize the temperature measurement of the soil layer at each depth. In this process, the fluid also has a liquid-gas-liquid conversion process. How to cooperate with its conversion process to facilitate the morphological conversion of the fluid is not disclosed in the prior art. At the same time, in order to facilitate the adjustment of the fluid pipe in the device, the device should be detachable and assembled, and can be adjusted at any time. The prior art also does not disclose how to achieve it.

[0003] The Chinese patent with the announcement number CN217424288U discloses a device for measuring the frost heave of soils of different thicknesses, wherein a guide rod is fixed on a pad and buried in the soil, and sleeves of different lengths are fixed on the pad and sleeved on the guide rod, and buried at a corresponding depth according to the thickness of the soil layer to be measured. When the soil layer frost heaves and thaws, the guide rod does not move, and the sleeve moves with the soil. The frost heave and thaw settlement of the soil layer are measured by a laser displacement sensor on the upper part of the sleeve. However, the document does not disclose how to cooperate with the morphological transformation process of the fluid;

[0004] Therefore, how to design a hot rod temperature field simulation test device for use in extremely cold areas so that it can cooperate with the fluid morphology transformation process and realize the temperature measurement of soil layers at various depths, which can be disassembled and assembled and adjusted at any time, becomes a problem to be solved. Utility Model Content

[0005] The utility model aims to provide a heat rod temperature field simulation test device for use in extremely cold areas to solve the above problems.

[0006] In order to achieve the above objectives, the following technical solutions are provided:

[0007] A hot rod temperature field simulation test device for use in extremely cold areas is used in conjunction with a frozen soil layer simulation soil sample, comprising: a test box for containing the frozen soil layer simulation soil sample and a plurality of hot rod units, wherein the plurality of hot rod units are sequentially arranged at intervals of 1, 2 and 4 times a fixed distance along the length direction of the test box, for testing the influence of the intervals of the hot rod units on the temperature field; the test device also comprises a temperature measuring unit and a circulating refrigeration unit, wherein the temperature measuring unit comprises a wire, a temperature sensor and a temperature recorder, and the circulating refrigeration unit comprises a delivery pipe and a circulating pump, wherein the wire and the delivery pipe pass through each hot rod unit in turn, and both enter the hot rod unit from one end of the hot rod unit, extend along the axial direction of the hot rod unit to its lower part, bend upward and extend through the other end of the hot rod unit, and both ends of the delivery pipe are connected to the circulating pump, and both ends of the wire are electrically connected to the temperature recorder, and the wire is also electrically connected to the temperature sensor.

[0008] Preferably, the hot rod unit includes a drill barrel, a measuring assembly and a limit assembly. The bottom of the measuring assembly is provided with an external thread, and the inner wall of the limit assembly is provided with an internal thread, so that the measuring assembly and the limit assembly can be threadedly connected. The inner wall of the limit assembly is also provided with an entry joint and an exit joint for passing the wire and the conveying pipe.

[0009] Preferably, the measuring assembly includes a top shell, a piston, a pressure plate, a first spring, a top column, a top plate, a measuring plate, a rotating rod frame and a rotating rod. The piston is exactly limited in the top shell and has the freedom to move in the vertical direction. A pressure plate is provided on the top of the piston. The top column runs through the top shell, and its two ends are respectively fixed to the pressure plate and the top plate. A first spring is also wound around the top column, one end of the first spring is fixedly connected to the pressure plate, and the other end is fixed to the inner wall of the top shell. The measuring plate is bolted to the top plate for measuring the rising distance of the piston. There are two rotating rod frames, which are symmetrically arranged at both ends of the outer wall of the top shell. The rotating rod is arranged between the two rotating rod frames and fixed to the two rotating rod frames.

[0010] Preferably, the limit assembly includes a bottom shell, a limit plate, a rotating ring, a wire seat and a delivery tube seat. The limit plate is fixedly arranged in the bottom shell, the rotating ring is sleeved on the outside of the bottom shell and fixed thereto, the limit plate is provided with two through holes of different calibers from top to bottom, the wire seat and the delivery tube seat are respectively arranged at the through holes of one caliber of the limit plate, a sleeve is also provided on the delivery tube in the limit assembly, a gear ring is also provided on the wire seat, and the test device also includes a beam splitting assembly, which is meshingly connected to the gear ring.

[0011] Preferably, the beam splitting assembly includes a beam splitting seat, a lifting cylinder and teeth. The lifting cylinder is arranged in the beam splitting seat. A beam splitting plate is also provided in the lifting cylinder for splitting the wires. Adjustment holes are opened on the outer wall surface of the lifting cylinder from front to back. An adjusting bolt is penetrated on the beam splitting seat for adjusting the height of the lifting cylinder. The teeth are arranged in the middle of the beam splitting seat.

[0012] Preferably, the rotating ring is also provided with raised blocks evenly spaced at fixed intervals along its circumference, and an annular groove is also provided on the inner wall of the drill tube. A friction plate and a plurality of elastic pads are provided in the annular groove along its circumference, and the friction plate is just arranged between two elastic pads. The raised blocks can abut against the elastic pads and / or the friction plate through their up and down movement.

[0013] Preferably, the outer wall of the drill tube is also recessed inward to form a accommodating cavity, and an arc plate and a second spring are provided in the accommodating cavity, and the two ends of the second spring are respectively connected to the cavity wall and the arc plate of the accommodating cavity, and the temperature sensor passes through the top wall of the accommodating cavity, and a part of the temperature sensor is located in the accommodating cavity, and a card bracket is also provided on the outer top wall of the accommodating cavity, and a part of the wire is limited in the card bracket and is electrically connected to the temperature sensor.

[0014] The beneficial effects of the utility model are:

[0015] 1. The utility model can test the temperature field of hot rods with different spacings by arranging hot rod units at different intervals. At the same time, the delivery pipe and the wire pass through each hot rod unit in sequence from bottom to top. The fluid in the delivery pipe can take away the heat in the soil layers at different depths to test the effect of lowering the soil layer temperature. The wire is connected to the sensors at different depths to realize the measurement of the soil layer temperature at different depths.

[0016] 2. The measuring assembly and the limit assembly are connected by threads in the utility model, so that the measuring assembly and the limit assembly can be disassembled from each other, which is convenient for adjusting the position of the pipeline. At the same time, the measuring assembly cooperates with the friction plate. When the limit assembly is pulled or pressed, the limit assembly is limited in rotation by friction, which is convenient for the threaded connection operation of the measuring assembly.

[0017] 3. Through the setting of the piston, the utility model allows the evaporated liquid fluid to enter the measuring assembly through the casing and push the piston to move. The gas work further promotes its re-liquefaction to participate in the soil layer cooling process. At the same time, by locating the position of the measuring plate, the movement of the piston can be observed to assist in determining the temperature of the soil layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the utility model without the wire and the conveying tube;

[0019] Figure 2is a schematic diagram of the structure of the hot rod unit;

[0020] Figure 3 for Figure 2 A magnified schematic diagram of the structure at center A;

[0021] Figure 4 is a partial schematic diagram of the measurement component;

[0022] Figure 5 It is a schematic diagram of the local coordination between the limit assembly and the conveying pipe;

[0023] Figure 6 It is a schematic diagram of the local coordination between the limit assembly and the beam splitting assembly;

[0024] Figure 7 Schematic diagram of the structure of the beam splitter Figure 1 ;

[0025] Figure 8 Schematic diagram of the structure of the beam splitter Figure 2 ;

[0026] Fig. 9 It is a schematic diagram of the half-section structure of the drill tube and the limit assembly;

[0027] Fig.10 A schematic diagram of a half-section structure of the drill tube located at the accommodating cavity;

[0028] In the figure:

[0029] 1-Test chamber;

[0030] 2-Hot rod unit;

[0031] 3-drill barrel, 301-annular groove, 302-friction plate, 303-elastic pad, 304-accommodating chamber, 305-arc plate, 306-second spring, 307-cage;

[0032] 4-measuring assembly, 401-top shell, 402-piston, 403-pressing plate, 404-first spring, 405-top column, 406-top plate, 407-measuring plate, 408-rotating rod frame, 409-rotating rod;

[0033] 5-limiting assembly, 501-insertion joint, 502-exit joint, 503-bottom shell, 504-limiting plate, 505-rotating ring, 506-conductor seat, 507-transmission pipe seat, 508-gear ring, 509-protruding block;

[0034] 6-beam splitter assembly, 601-beam splitter seat, 602-lifting cylinder, 603-teeth, 604-beam splitter plate, 605-adjusting hole, 606-adjusting bolt;

[0035] 701-wire, 702-temperature sensor, 703-temperature recorder;

[0036] 801-transport pipe, 802-circulation pump, 803-casing pipe;

[0037] 9-Soil samples of frozen soil layer simulation. DETAILED DESCRIPTION

[0038] The following will combine the embodiments of the present invention to clearly and completely describe the technical solutions of the schematic diagrams in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] like Figure 1-10 As shown, a hot rod temperature field simulation test device for use in extremely cold areas is used in conjunction with a frozen soil simulation sample, comprising: a test box 1 for containing a frozen soil simulation sample 9 and a plurality of hot rod units 2, wherein the plurality of hot rod units 2 are sequentially arranged along the length direction of the test box 1 at intervals of 1, 2, and 4 times a fixed distance, for testing the influence of the intervals of the hot rod units 2 on the temperature field, the test device further comprising a temperature measuring unit and a circulating refrigeration unit, the temperature measuring unit comprising a wire 701, a temperature sensor 702, and a temperature recorder 703, the circulating refrigeration unit comprising a delivery pipe 801 and a circulating pump 802, the wire 701 and the delivery pipe 801 both pass through each hot rod unit 2 in turn, and both are connected from one end of the hot rod unit 2 to the other end of the hot rod unit 2. After entering the hot rod unit 2, extending along the axial direction of the hot rod unit 2 to its lower part, it bends and extends upward and passes through the other end of the hot rod unit 2. The two ends of the delivery pipe 801 are connected to the circulation pump 802, and the two ends of the wire 701 are electrically connected to the temperature recorder 703, and the wire 701 is also electrically connected to the temperature sensor 702; by setting the hot rod units 2 at different intervals, the temperature field of hot rods at different intervals can be tested. At the same time, the delivery pipe 801 and the wire 701 pass through each hot rod unit 2 in sequence, first from bottom to top, and the fluid in the delivery pipe 801 can take away the heat in the soil layers at different depths, and test the effect of reducing the soil layer temperature. The wire 701 is connected to the sensors at different depths to achieve the measurement of the soil layer temperature at different depths;

[0040] In some embodiments, the hot rod unit 2 includes a drill tube 3, a measuring component 4 and a limiting component 5. The bottom of the measuring component 4 is provided with an external thread, and the inner wall of the limiting component 5 is provided with an internal thread, so that the measuring component 4 and the limiting component 5 can be threadedly connected. The inner wall of the limiting component 5 is also provided with an insertion joint 501 and an exit joint 502 for passing the wire 701 and the conveying pipe 801; the measuring component 4 and the limiting component 5 are threadedly connected, so that the measuring component 4 and the limiting component 5 can be disassembled from each other, which is convenient for adjusting the position of the pipeline. At the same time, the measuring component 4 cooperates with the friction plate 302. When the limiting component 5 is pulled or pressed, the limiting component 5 is limited in rotation by friction, which is convenient for the threaded connection operation of the measuring component 4;

[0041] In some embodiments, the measuring assembly 4 includes a top shell 401, a piston 402, a pressure plate 403, a first spring 404, a top column 405, a top plate 406, a measuring plate 407, a rotating rod frame 408 and a rotating rod 409. The piston 402 is exactly limited in the top shell 401 and has the freedom to move in the vertical direction. The top of the piston 402 is provided with a pressure plate 403, and the top column 405 passes through the top shell 401, and its two ends are respectively fixed to the pressure plate 403 and the top plate 406. The top column 405 is also wound with a first spring 404, one end of the first spring 404 is fixedly connected to the pressure plate 403, and the other end is fixed to the top shell 401. On the inner wall, the measuring plate 407 is bolted to the top plate 406 to measure the distance the piston 402 rises. There are two rotating rod frames 408, which are symmetrically arranged at the two ends of the outer wall of the top shell 401. The rotating rod 409 is arranged between the two rotating rod frames 408 and fixed to the two rotating rod frames 408. Through the arrangement of the piston 402, the evaporated liquid fluid can enter the measuring component 4 through the sleeve 803 and push the piston 402 to move. The gas work further promotes its re-liquefaction to participate in the soil layer cooling process. At the same time, by positioning the position of the measuring plate 407, the movement of the piston 402 can be observed to assist in determining the temperature of the soil layer.

[0042] In some embodiments, the limiting assembly 5 includes a bottom shell 503, a limiting disk 504, a rotating ring 505, a wire seat 506 and a delivery tube seat 507. The limiting disk 504 is fixedly arranged in the bottom shell 503, and the rotating ring 505 is sleeved outside the bottom shell 503 and fixed thereto. The limiting disk 504 is penetrated from top to bottom and has two through holes with different calibers. The wire seat 506 and the delivery tube seat 507 are respectively arranged at the through holes of one caliber of the limiting disk 504. A sleeve 803 is also provided on the delivery tube 801 located in the limiting assembly 5, and a gear ring 508 is also provided on the wire seat 506. The test device also includes a beam splitting assembly 6, which is meshed and connected with the gear ring 508.

[0043] In some embodiments, the beam splitter assembly 6 includes a beam splitter seat 601, a lifting cylinder 602 and teeth 603. The lifting cylinder 602 is arranged in the beam splitter seat 601. A beam splitter plate 604 is also arranged in the lifting cylinder 602 for beam splitting the wire 701. An adjustment hole 605 is provided on the outer wall of the lifting cylinder 602 in a front-to-back manner. An adjustment bolt 606 is provided on the beam splitter seat 601 for adjusting the height of the lifting cylinder 602. The teeth 603 are arranged in the middle of the beam splitter seat 601.

[0044] In some embodiments, the rotating ring 505 is also provided with protrusions 509 at fixed intervals uniformly along its circumference, and an annular groove 301 is also provided on the inner wall of the drill tube 3. A friction plate 302 and a plurality of elastic pads 303 are provided in the annular groove 301 along its circumference. The friction plate 302 is just arranged between two elastic pads 303. The protrusions 509 can abut against the elastic pads 303 and / or the friction plate 302 through its up and down movement.

[0045] In some embodiments, the outer wall of the drill tube 3 is further recessed inward to form a receiving chamber 304, and an arc plate 305 and a second spring 306 are provided in the receiving chamber 304. The two ends of the second spring 306 are respectively connected to the chamber wall of the receiving chamber 304 and the arc plate 305. The temperature sensor 702 passes through the top wall of the receiving chamber 304, and a part of the temperature sensor 702 is located in the receiving chamber 304. A bracket 307 is also provided on the outer top wall of the receiving chamber 304. A part of the wire 701 is limited in the bracket 307 and is electrically connected to the temperature sensor 702.

[0046] In this embodiment, when the test starts, the drill tube 3 is inserted into the soil layer, and the device is placed in an ambient temperature of -35°C to -50°C. At this time, the temperature in the soil layer is slightly higher than the ambient temperature. Liquid ammonia is selected as the fluid, and its boiling point is -33.5°C. It is introduced into the delivery pipe 801 and circulated through the circulation pump 802. Since the temperature in the soil layer is slightly higher than the ambient temperature, the liquid ammonia at the bottom of the drill tube 3 evaporates and becomes gas, moves upward, and pushes the piston 402 to move. Due to the work done by the gas and the low temperature above the drill tube 3, the liquid ammonia is re-liquefied, and the cycle continuously transports the heat in the soil layer to the outside. When the drill tube 3 drills into the soil layer, there is soil in the accommodating chamber 304, and the temperature sensor 702 contacts the soil to measure the temperature. When the drill tube 3 is taken out, due to the gradual decrease of the soil pressure, the arc plate 305 can push part of the soil out of the drill tube 3.

Claims

1. A heat rod temperature field simulation test device used in extremely cold areas, used in conjunction with a frozen soil simulation soil sample, characterized in that: include: A test box for containing simulated soil samples of frozen soil layer and a plurality of hot rod units, wherein the plurality of hot rod units are arranged in sequence along the length direction of the test box at intervals of 1, 2 and 4 times a fixed distance, for testing the influence of the intervals of the hot rod units on the temperature field, the test device also includes a temperature measuring unit and a circulating refrigeration unit, the temperature measuring unit includes a wire, a temperature sensor and a temperature recorder, the circulating refrigeration unit includes a delivery pipe and a circulating pump, the wire and the delivery pipe pass through each hot rod unit in sequence, and both enter the hot rod unit from one end of the hot rod unit, extend along the axial direction of the hot rod unit to its lower part, bend and extend upward and pass through the other end of the hot rod unit, both ends of the delivery pipe are connected to the circulating pump, both ends of the wire are electrically connected to the temperature recorder, and the wire is also electrically connected to the temperature sensor.

2. The heat rod temperature field simulation test device used in extremely cold areas according to claim 1, characterized in that: The hot rod unit includes a drill barrel, a measuring component and a limit component. The bottom of the measuring component is provided with an external thread, and the inner wall of the limit component is provided with an internal thread, so that the measuring component and the limit component can be threadedly connected. The inner wall of the limit component is also provided with an entry joint and an exit joint for passing the wire and the conveying pipe.

3. The heat rod temperature field simulation test device used in extremely cold areas according to claim 2, characterized in that: The measuring assembly includes a top shell, a piston, a pressure plate, a first spring, a top column, a top plate, a measuring plate, a rotating rod frame and a rotating rod. The piston is limited in the top shell and has the freedom to move in the vertical direction. A pressure plate is provided on the top of the piston. The top column runs through the top shell, and its two ends are respectively fixed to the pressure plate and the top plate. A first spring is also wound around the top column, one end of the first spring is fixedly connected to the pressure plate, and the other end is fixed to the inner wall of the top shell. The measuring plate is bolted to the top plate for measuring the rising distance of the piston. There are two rotating rod frames, which are symmetrically arranged at the two ends of the outer wall of the top shell. The rotating rod is arranged between the two rotating rod frames and fixed to the two rotating rod frames.

4. The heat rod temperature field simulation test device used in extremely cold areas according to claim 3 is characterized in that: The limiting assembly includes a bottom shell, a limiting plate, a rotating ring, a wire seat and a conveying pipe seat. The limiting plate is fixedly arranged in the bottom shell, the rotating ring is sleeved outside the bottom shell and fixed thereto, the limiting plate is penetrated from top to bottom and has two through holes with different calibers, the wire seat and the conveying pipe seat are respectively arranged at through holes of one caliber of the limiting plate, a sleeve is also provided on the conveying pipe in the limiting assembly, a gear ring is also provided on the wire seat, and the test device also includes a beam splitting assembly, which is meshingly connected with the gear ring.

5. The heat rod temperature field simulation test device used in extremely cold areas according to claim 4, characterized in that: The beam splitting assembly includes a beam splitting seat, a lifting cylinder and teeth. The lifting cylinder is arranged in the beam splitting seat. A beam splitting plate is also provided in the lifting cylinder for beam splitting the wires. Adjustment holes are opened on the outer wall surface of the lifting cylinder from front to back. An adjustment bolt is penetrated on the beam splitting seat for adjusting the height of the lifting cylinder. The teeth are arranged in the middle of the beam splitting seat.

6. The heat rod temperature field simulation test device used in extremely cold areas according to claim 5, characterized in that: The rotating ring is also provided with raised blocks evenly spaced at fixed intervals along its circumference, and an annular groove is also provided on the inner wall of the drill tube. A friction plate and a plurality of elastic pads are provided in the annular groove along its circumference, and the friction plate is just arranged between two elastic pads. The raised blocks can abut against the elastic pads and / or the friction plate through their up and down movement.

7. The heat rod temperature field simulation test device used in extremely cold areas according to claim 6, characterized in that: The outer wall of the drill tube is also recessed inward to form a receiving cavity, and an arc plate and a second spring are arranged in the receiving cavity. The two ends of the second spring are respectively connected to the cavity wall and the arc plate of the receiving cavity. The temperature sensor passes through the top wall of the receiving cavity, and a part of the temperature sensor is located in the receiving cavity. The outer top wall of the accommodating cavity is also provided with a card frame, and a part of the wire is limited in the card frame. And electrically connected to the temperature sensor.

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