CN210775296U - Air suction type soil body heat conductivity coefficient measuring device - Google Patents
Air suction type soil body heat conductivity coefficient measuring device Download PDFInfo
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- CN210775296U CN210775296U CN201921287626.XU CN201921287626U CN210775296U CN 210775296 U CN210775296 U CN 210775296U CN 201921287626 U CN201921287626 U CN 201921287626U CN 210775296 U CN210775296 U CN 210775296U
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- heat conductivity
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Abstract
The utility model provides a measuring device of bleeder soil body coefficient of heat conductivity. The measuring device comprises an outer chamber, a sample chamber, a heat conductivity coefficient test probe, a PTFE (polytetrafluoroethylene) film, a cylindrical porous plate, a rubber ring and a rubber gasket, wherein the heat conductivity coefficient probe is placed in the sample chamber, and the sample chamber is placed in the outer chamber. And the outer chamber is connected with an external air pump, and the heat conductivity coefficient test probe is connected with an external voltage stabilizer and a temperature monitor. The utility model has the advantages that: the problem that the heat conductivity coefficient of a solid phase composition substance of a soil body is difficult to obtain is effectively solved, and the heat conductivity coefficients of the solid phase composition substance and a soil-water mixture can be effectively measured; the method has important value for measuring and researching the heat conductivity coefficients of saturated and unsaturated soil bodies; has important practical significance for theoretical research of temperature field.
Description
Technical Field
The utility model belongs to ground body basic thermal parameter test research field especially relates to a measuring device and implementation method of bleeder soil body coefficient of heat conductivity. The device is used for measuring the heat conductivity coefficient of soil solid phase composition substances of rock and soil-water mixture.
Background
For the research of the heat conductivity coefficients of saturated and unsaturated soil bodies, the heat conductivity coefficients of the solid phase composition substances of the soil bodies and the soil-water mixture are very important to obtain. However, the existing device and test means can not directly measure the thermal conductivity of the solid phase composition substance of the soil body and the soil-water mixture, so that a device and a method for testing the thermal conductivity of the solid phase composition substance of the soil body and the soil-water mixture are urgently needed, the device and the method are used for accurately measuring the thermal conductivity of the solid phase composition substance of the saturated and unsaturated soil bodies and the soil-water mixture, and the device and the method have important practical significance for soil body thermal parameter research, geotechnical thermal calculation and temperature field analysis.
Disclosure of Invention
The utility model discloses a first purpose is in order to solve the difficult direct measurement of coefficient of heat conductivity of soil body solid phase composition material and soil-water mixture and obtain and provide a measuring device of air suction type soil body coefficient of heat conductivity.
The second objective of the present invention is to provide a method for obtaining the thermal conductivity of the soil solid phase composition material and the soil-water mixture by using a measuring device for the air-extracting soil thermal conductivity.
In order to achieve the above object, the utility model discloses a first technical scheme be: the measuring device comprises a pressure chamber, a sample chamber and a heat conductivity coefficient test probe device, wherein the heat conductivity coefficient test probe device is arranged in the sample chamber, the sample chamber is arranged in the pressure chamber, the pressure chamber is provided with an air guide one-way valve connected with an external air suction pump, the heat conductivity coefficient test probe device comprises a probe and a wire hole which are arranged on a cylindrical base, and the probe is connected with an external temperature tester through a wire.
The sample chamber is a hollow cylinder, the outer side of the bottom of the cylinder is provided with a lower flange fixed with the pressure chamber, the upper side and the lower side of the inner side are respectively provided with a groove, the lower groove is matched with the cylindrical base, a cylindrical porous plate is arranged in the upper groove, the upper layer and the lower layer of the porous plate are respectively provided with a PTFE film and are fixed on the cylinder through an upper fixing ring, and an annular rubber gasket is arranged between the bottom of the cylinder and the pressure chamber.
The pressure chamber comprises a top plate, a bottom plate and a side wall, wherein the upper end and the lower end of the side wall are respectively provided with a rubber ring placing groove of a rubber ring sealed with the top plate and the bottom plate, the top plate is provided with an air guide hole and is externally connected with an air guide one-way valve, and the bottom plate is provided with a cylindrical bottom groove and a lead leading-out hole which are connected with the cylindrical base.
The PTFE film is polytetrafluoroethylene material, cylindrical porous disk is permeable stone or macromolecular material.
The temperature tester is connected with a voltage stabilizer.
The utility model discloses a another technical scheme is: an implementation method of a measuring device for the heat conductivity coefficient of an air suction type soil body comprises the following steps:
the method comprises the following steps:
1) placing a cylindrical sample in a sample chamber and inserting a probe into the center of the sample;
2) connecting an exhaust pipe of the air pump to the air guide one-way valve, and checking the tightness of the device;
3) after the device is ensured to be sealed completely, the air in the device is pumped by using the air pump, the reading of an instrument of the air pump is observed, and the air pressure difference between the inside and the outside of the device is maintained at 1 MPa;
4) treat that the instrument reading of aspiration pump is stable the back, be connected the wire of coefficient of heat conductivity test probe with temperature tester and stabiliser respectively, wherein: 2 temperature lines of the lead are connected with a temperature tester, a red positive line is connected with the positive electrode of a voltage stabilizer, and a black negative line is connected with the negative electrode of the voltage stabilizer;
5) turning on the voltage regulator, and adjusting the output power of the voltage regulator: the output power of the voltage stabilizer is not suitable to be too large, the output power is controlled to be between 0.45 and 0.5W, and then the voltage stabilizer is turned off. The output power P calculation formula is that P is UI (1)
In the formula, P is the output power of the voltage stabilizer and has the unit of W; u is the output voltage in units of V; i is output current, unit A;
opening a temperature tester to test the temperature change of the sample, opening a voltage stabilizer to heat the probe when the temperature indication of the temperature tester is not changed any more, closing the voltage stabilizer when the temperature indication of the temperature tester is stable, and storing temperature data;
6) sorting the data into a T-lnt curve according to the temperature data stored in the step 5), and calculating the heat conductivity coefficient by using a general formula (2)
Wherein λ is a thermal conductivity, W/(m.K); q is the heat flux density in J/(m)2S); t is temperature, in K; t is time in units h.
Because the influence of air in the sample is eliminated by air extraction, the heat conductivity coefficient obtained by the formula (2) needs to be calculated by the formula (3), and the heat conductivity coefficient of the solid phase composition substance and the soil-water mixture can be obtained
In the formula, λ1The thermal conductivity coefficient of the soil-water mixture is solid phase composition matter; n is the porosity of the sample and is obtained by calculation according to the formula (4)
Where ρ and ρ arew、ρdRespectively the density of the soil body, the density of water and the density of dry soil; and w is the water content of the soil body.
The utility model has the advantages that: the air suction type soil body heat conductivity coefficient testing device can accurately measure the heat conductivity coefficients of solid phase composition substances and soil-water mixtures of saturated and unsaturated soil bodies, and has important practical significance for soil body thermal parameter research, geotechnical thermal calculation and temperature field analysis.
Drawings
Fig. 1 is a schematic structural view of a sample chamber of the present invention;
FIG. 2 is a schematic view of the structure of the thermal conductivity test probe of the present invention;
FIG. 3 is a schematic structural view of the fixing ring of the present invention;
FIG. 4 is a schematic view of the rubber pad structure of the present invention;
FIG. 5 is a schematic view of the rubber ring structure of the present invention;
FIG. 6 is a schematic structural position diagram of the PTFE film and the cylindrical permeable plate of the present invention;
fig. 7 is a schematic structural view of the side wall of the pressure chamber of the present invention;
fig. 8 is a schematic diagram of the structure of the top plate of the pressure chamber according to the present invention;
fig. 9 is a schematic diagram of the structure of the pressure chamber bottom plate of the present invention;
fig. 10 is a drawing illustrating a lead of the present invention;
fig. 11 is an assembly diagram of the suction type soil heat conductivity coefficient testing device of the present invention;
fig. 12 is a schematic structural view of the suction type soil heat conductivity coefficient testing device of the present invention.
In the figure:
1. pressure chamber 2, sample chamber 3, heat conductivity coefficient test probe
7. Rubber gasket 11, top plate 12 and bottom plate
13. Side wall 14, screw 21, lower flange
22. Side groove 23, fixed ring 31, cylindrical base
32. Probe 33, wire 111, air guide hole
112. Rubber ring placing groove 113, screw hole 114 and air guide one-way valve
121. Cylindrical bottom slot 122, wire guide 331, temperature wire
332. Red positive electrode wire 333. black negative electrode wire
Detailed Description
The following describes a measuring device for the heat conductivity of a soil body and an implementation method thereof with reference to the accompanying drawings.
A measuring device for the heat conductivity coefficient of an air suction type soil body and an implementation method are based on the following steps: when the gas in the soil body is pumped away, namely the soil body is in a low vacuum state, the soil body can be regarded as a soil body single-phase heat transfer body or a soil-water two-phase heat transfer body. By testing the soil body in the low vacuum environment, the solid phase composition substances of saturated and unsaturated soil bodies and the heat conductivity coefficient of a soil-water mixture can be effectively obtained, so that the purpose of measuring the heat conductivity coefficient is achieved.
As shown in fig. 1 to 12, a measuring device for heat conductivity of a suction soil body: the device comprises a pressure chamber 1, a sample chamber 2, a thermal conductivity test probe 3, a PTFE film 4, a cylindrical porous plate 5, a rubber ring 6 and a rubber gasket 7. The pressure chamber 1 is composed of a top plate 11, a bottom plate 12, a side wall 13 and a screw 14. The top plate 11 includes an air hole 111, a rubber ring placing groove 112, a screw hole 113, and an air guide check valve 114. The base plate 12 includes a rubber ring placement groove 112, a screw hole 113, a cylindrical bottom groove 121, and a wire guide hole 122. The side wall 13 includes upper and lower rubber ring-placing grooves 112. The main body of the sample chamber 2 is a hollow cylinder with a lower flange 21, the sample chamber 2 is provided with a concave side groove 22 respectively at the upper and lower parts, the sample chamber 2 is provided with a screw hole 113, a fixing ring 23 and a screw 14, and the fixing ring 23 is a hollow cylinder with a screw hole 113. The thermal conductivity test probe 3 is composed of a cylindrical base 31, a probe 32, a wire hole 122 and a wire 33, wherein the wire 33 is composed of 2 temperature wires 331, 1 red positive wire 332 and 1 black negative wire 333. The PTFE membrane 4 is a gas-permeable, water-impermeable polymer membrane made of a polytetrafluoroethylene material. The cylindrical porous plate 5 can be made of high-quality porous stone or polymer porous plate. The rubber ring 6 is made of rubber material and is in a ring shape. The rubber gasket 7 is made of a rubber material, is a hollow cylindrical sheet, and has screw holes 113.
The utility model discloses a measuring device of bleeder soil body coefficient of heat conductivity's equipment step:
1) the lead wires 33 of the thermal conductivity test probes 3 are passed through the lead wire holes 122 of the base plate 12 from the inside to the outside, and the thermal conductivity test probes 3 are placed in the cylindrical bottom grooves 121 of the base plate 12.
2) The rubber gasket 7 is placed on the periphery of the cylindrical bottom groove 121 of the bottom plate 12, the sample chamber 2 is pressed from top to bottom to cover the rubber gasket 7, the lower flange 21, the bottom plate 12 and the screw hole 113 of the rubber gasket 7 are aligned, and the rubber gasket 7 is screwed and fixed by the screw 14.
3) The PTFE membrane 4, the cylindrical water permeable plate 5, and the PTFE membrane 4 are placed in this order on the side groove 22 of the sample chamber 2, covered with the fixing ring 23, and the sample chamber 2 and the fixing ring 23 are fixed by the screw 14.
4) The rubber ring 6 is placed in the rubber ring 6 placement groove 112 of the side wall 13, placed between the top plate 11 and the bottom plate 12, and the top plate 11, the side wall 13, and the bottom plate 12 are fixed by screws 14. Thus assembling the measuring device of the heat conductivity coefficient of the air suction type soil body.
An implementation method of a measuring device for the heat conductivity coefficient of a suction type soil body comprises the following steps:
1) a cylindrical soil sample is placed in the sample chamber and a probe is inserted into the center of the sample. Cleaning up the floating soil inside the pressure chamber and outside the sample chamber, and completely assembling the device according to the assembling steps 1) -4) of the measuring device;
2) connecting an exhaust pipe of an air pump to the air guide one-way valve, smearing soapy water at the joint of the top plate, the bottom plate and the side wall, inflating the device at low pressure, and observing whether the joint of the top plate, the bottom plate and the side wall foams or not so as to check the tightness of the device. If the bubbling indicates that the tightness of the device is poor, checking whether the rubber ring is intact and whether the pressure chamber screw is tightened;
3) after the device is ensured to be sealed well, the air guide one-way valve of the device is connected with an external air pump, and the air in the device is extracted by the air pump. And observing the reading of a pressure gauge of the air pump, and maintaining the air pressure difference of at least 1MPa between the inside and the outside of the device;
4) and after the reading of the instrument of the air pump is stable, connecting the wires of the heat conductivity coefficient test probe of the device with a temperature tester and a voltage stabilizer respectively. Wherein, 2 temperature lines of the device wire are connected with the temperature tester, a red positive line of the device wire is connected with the positive electrode of the voltage stabilizer, and a black negative line of the device wire is connected with the negative electrode of the voltage stabilizer;
5) the regulator is turned on and the output power of the regulator is regulated. The output power of the voltage stabilizer is not suitable to be too large, the output power is controlled to be between 0.45 and 0.5W, and then the voltage stabilizer is turned off. The output power P calculation formula is that P is UI (1)
Wherein, P is the output power of the voltage stabilizer, W; u is the output voltage, V; i is the output current, A.
Opening a temperature tester to test the temperature change of the sample, opening a voltage stabilizer to heat the probe when the temperature indication of the temperature tester is not changed any more, closing the voltage stabilizer when the temperature indication of the temperature tester is stable, and storing temperature data;
6) sorting the data into a T-lnt curve according to the temperature data stored in the step 5), and calculating the heat conductivity coefficient by using a general formula (2)
Wherein λ is a thermal conductivity, W/(m.K); q is heat flux density, J/(m)2S); t is temperature, K; t is time, h.
Because the influence of air in the sample is eliminated by air extraction, the heat conductivity coefficient obtained by the formula (2) needs to be calculated by the formula (3), and the heat conductivity coefficient of the solid phase composition substance and the soil-water mixture can be obtained
In the formula, λ1The thermal conductivity coefficient of the soil-water mixture is solid phase composition matter; n is the porosity of the sample and is calculated by the formula (4).
Where ρ and ρ arew、ρdRespectively the density of the soil body, the density of water and the density of dry soil; and w is the water content of the soil body.
7) After the test was completed, the sample was cleaned, and the device was rinsed and assembled.
The utility model has the effects that: the air suction type soil body heat conductivity coefficient testing device is simple and convenient to operate, can accurately measure the heat conductivity coefficients of solid phase composition substances of saturated and unsaturated soil bodies and soil-water mixtures, and has important practical significance for researching soil body thermal parameters, engineering geotechnical thermal calculation and temperature field analysis.
Claims (5)
1. The utility model provides a measuring device of bleeder soil body coefficient of heat conductivity, characterized by: the test device comprises a pressure chamber (1), a sample chamber (2) and a heat conductivity test probe device (3), wherein the heat conductivity test probe device (3) is arranged in the sample chamber (2), the sample chamber (2) is arranged in the pressure chamber (1), the pressure chamber (1) is provided with an air guide one-way valve (114), and the heat conductivity test probe device (3) comprises a probe (32) and a lead (33) which are arranged on a cylindrical base (31).
2. The apparatus for measuring heat conductivity of a suction soil body according to claim 1, wherein: sample chamber (2) are hollow cylinder, the cylinder bottom outside is equipped with bottom flange (21) fixed with pressure chamber (1), and the inboard upper and lower respectively has the recess, lower groove (22) and with cylindrical base (31) looks adaptation, be equipped with cylindrical porous disk (5) in the upper groove, the upper and lower layer of cylindrical porous disk (5) all is equipped with PTFE film (4) and fixes on the cylinder through solid fixed ring (23) in upper portion, be equipped with annular rubber gasket (7) between cylinder bottom and pressure chamber (1).
3. The apparatus for measuring heat conductivity of a suction soil body according to claim 1, wherein: the pressure chamber (1) comprises a top plate (11), a bottom plate (12) and a side wall (13), wherein the upper end and the lower end of the side wall (13) are respectively provided with a rubber ring placing groove (112) of a rubber ring (6) sealed with the top plate (11) and the bottom plate (12), the top plate (11) is provided with an air guide hole (111) and is externally connected with an air guide one-way valve (114), and the bottom plate (12) is provided with a cylindrical bottom groove (121) of a cylindrical base (31) and a lead leading-out hole.
4. The apparatus for measuring thermal conductivity of a pumping soil mass as claimed in claim 2, wherein: the PTFE film (4) is made of polytetrafluoroethylene materials, and the cylindrical porous plate (5) is made of porous stone or high polymer materials.
5. The apparatus for measuring heat conductivity of a suction soil body according to claim 1, wherein: the probe (32) is composed of 2 temperature lines (331), 1 red positive line (332) and 1 black negative line (333), the obtained temperature line (331) is connected with an external temperature tester, and the red positive line (332) and the black negative line (333) are connected with the positive electrode and the negative electrode corresponding to the voltage stabilizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921287626.XU CN210775296U (en) | 2019-08-09 | 2019-08-09 | Air suction type soil body heat conductivity coefficient measuring device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921287626.XU CN210775296U (en) | 2019-08-09 | 2019-08-09 | Air suction type soil body heat conductivity coefficient measuring device |
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| CN210775296U true CN210775296U (en) | 2020-06-16 |
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| CN201921287626.XU Expired - Fee Related CN210775296U (en) | 2019-08-09 | 2019-08-09 | Air suction type soil body heat conductivity coefficient measuring device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320234A (en) * | 2019-08-09 | 2019-10-11 | 天津城建大学 | A kind of measuring device and implementation method of bleeder soil body thermal coefficient |
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2019
- 2019-08-09 CN CN201921287626.XU patent/CN210775296U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110320234A (en) * | 2019-08-09 | 2019-10-11 | 天津城建大学 | A kind of measuring device and implementation method of bleeder soil body thermal coefficient |
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Granted publication date: 20200616 Termination date: 20210809 |