CN103885496A - High and low temperature triaxial test temperature control device - Google Patents
High and low temperature triaxial test temperature control device Download PDFInfo
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- CN103885496A CN103885496A CN201410120123.9A CN201410120123A CN103885496A CN 103885496 A CN103885496 A CN 103885496A CN 201410120123 A CN201410120123 A CN 201410120123A CN 103885496 A CN103885496 A CN 103885496A
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Abstract
The invention discloses a high and low temperature triaxial test temperature control device comprising a triaxial pressure chamber and a temperature control system. Asbestos type heat insulation layers are arranged on the outer wall of an organic glass cylinder, the top of a top cover and the bottom of a base of the triaxial pressure chamber. The temperature control system comprises a temperature measuring and controlling instrument, a temperature sensor, a spiral copper tube, an electromagnetic valve and a refrigerating/heating source. The spiral copper tube is tightly attached to the inner wall of the pressure chamber. One end of the spiral copper tube is a refrigerating fluid inlet, and the other end of the spiral copper tube is a refrigerating fluid outlet. The refrigerating fluid inlet is connected with a refrigerating fluid supply opening of the refrigerating/heating source through an electromagnetic valve. The refrigerating fluid outlet is connected with a refrigerating fluid reflux inlet of the refrigerating/heating source. After receiving signals of the temperature sensor, the temperature measuring and controlling instrument sends an instruction to the electromagnetic valve according to a set temperature value, so that opening and closing of the electromagnetic valve are controlled. By the adoption of the high and low temperature triaxial test temperature control device, full-automatic triaxial high and low temperature control is achieved, the temperature control effect is good, the precision is high, the long-term stability is good, and triaxial tests of temperature-sensitive materials such as a soil sample and bituminous concrete at different temperatures can be conducted.
Description
Technical field
The present invention relates to a kind of attemperating unit that can control effectively to triaxial test temperature, realize the different temperatures such as high temperature, the low temperature test condition of triaxial test, belong to civil engineering work earthwork test Instrument technical field.
Background technology
The temperature in the basins such as the Yellow River, with constantly changing season, is worked as climate warming, and temperature rise occurred that ice berg, this special ice condition of ice dam will form great potential safety hazard, probably caused Ling Hong to overflow originally in river.Once ice flood disaster occurs, and will greatly endanger the people's lives and property safety, causes serious economic loss.Therefore further investigate icepro phase temperature variation to the stable impact of dyke, for the control of scientific guidance embankment dangerous situation, improve the stability of embankment, guarantee that construction project and people life property safety have very important theory significance and practical value.For this problem, be necessary to carry out for soil strength distortion ice flood season the further investigation of the Changing Pattern of temperature effect.
Bituminous concrete is widely used in highway engineering, along with bituminous concrete performance understanding is progressively goed deep into, mechanization of building operation degree improves gradually, and asphaltic concrete core wall antiseepage earth and rockfill dam becomes focus and the focus of current engineering circles, and this dam type has become the popularization dam type of International Commission on Large Dams.Along with the rising of temperature, bituminous concrete becomes soft plasticity from hard fragility, and temperature sensitivity is very remarkable.But due to reasons such as limitation of the technology, import equipment are too expensive, the temperature sensitivity of this material and temperature safety evaluatio aspect still lack deep research.
In order to study the temperature benefit of mechanical property of soil strength deformation characteristic ice flood season, bituminous concrete equitemperature sensitive material, the soil test equipment under normal temperature can not meet the demands, need can temperature control triaxial test equipment.Existing three axle attemperating units or can only unidirectional temperature control, that triaxial apparatus is placed in to constant temperature enclosure or constant temperature oven in pressure chamber's outer cup, expense is higher or operate upper Shortcomings, therefore, develops economic, practical high low temperature triaxial test attemperating unit and seems particularly urgent and important.
Summary of the invention
For the above-mentioned deficiency of existing experimental technique, the technical problem to be solved in the present invention is to provide a kind of high low temperature triaxial test attemperating unit, temperature control efficiency is high, can realize height temperature control, and the long-time stability of temperature control are good, realize the Automatic Control of test temperature, and accuracy of temperature control is high, thereby three axles of carrying out soil sample under different temperatures or bituminous concrete equitemperature sensitive material are quiet, power and creep test, improve the universality of temperature control three axles.
According to foregoing invention design, the present invention is achieved by the following technical solutions:
1, a high low temperature triaxial test attemperating unit, comprises triaxial cell, temperature control system, and described triaxial cell comprises top cover, organic glass cylinder, nut, pull bar, base; The top cover of described organic glass cylinder screws pull bar with base employing nut and is connected.Described temperature control system comprises temperature measurement-control instrument, temperature sensor, spirality copper tube, solenoid valve, cooling/heating source; Described temperature sensor lower end probe is placed in triaxial cell's organic glass cylinder, and upper end wire is connected with temperature measurement-control instrument, and solenoid valve is also connected with temperature measurement-control instrument by wire; Described spirality copper tube is arranged on the organic glass cylinder inwall of triaxial cell, spirality copper tube one port is refrigerating fulid import, another port is refrigerating fulid outlet, described refrigerating fulid import is connected with the refrigerating fulid supply port in cooling/heating source by solenoid valve, and refrigerating fulid outlet is connected with the refrigerating fulid refluxing opening in cooling/heating source.
The insulation materials such as 2, described organic glass drum outer wall, top cover top, base bottom also arrange thermofin, and described thermofin is asbestos.
3, described temperature sensor inserts sensor probe in the organic glass cylinder of triaxial cell by joint through pressure chamber's top cover, and joint bottom arranges one " O " RunddichtringO.
4, described spirality copper tube is close to organic glass infuser inwall, adopts the even coiling of Φ 8 copper tube to form, the deburring of aperture, end.
5, the two ends of described spirality copper tube are from bottom to top respectively by gland nut, and cone seal packing ring, passes pressure chamber's top cover by joint sealing.
6, described temperature measurement-control instrument is digital display type intelligent measurement and control of temperature instrument, has that preset, the high limit of lower bound is preset, the function of observing and controlling, is connected with temperature sensor, solenoid valve by wire.
7, on the pipeline of described refrigerating fulid outlet, a refrigerating fulid outlet valve is set, is then connected with the refrigerating fulid refluxing opening in cooling/heating source.
8, a refrigerating fulid imported valve is set on the pipeline of described refrigerating fulid import, then pipeline is connected with the refrigerating fulid supply port in cooling/heating source through solenoid valve.
9, described solenoid valve is Japanese SMC admission valve, and maximum working pressure (MWP) is hydraulic pressure 2.5MPa, flow aperture 3mm.
10, the volume in described cooling/heating source is 210L, circular flow 2.5m
3/ h, and be provided with electrothermal tube, take into account refrigeration and heating function simultaneously.
The beneficial effect of this patented claim compared with conventional art
1, the present invention improves and has increased temperature control system on routine intravenous triaxial apparatus, dynamic triaxial apparatus, creep triaxial apparatus basis, has realized the effective control to temperature, and the long-time stability of temperature control are good, can carry out quiet, moving, creep triaxial test under different temperatures.
2, the present invention, in order to make soil sample entirety thermally equivalent, evenly arranges multi-circle spiral flow shape copper tube in pressure chamber, has effectively guaranteed the homogeneity of heating or refrigeration.
3, the present invention adopts the refrigerating fulid that coefficient of heat conductivity is high to carry out temperature transmission as circulation fluid, and temperature control efficiency is high.
4, the present invention, in order to prevent scattering and disappearing of pressure chamber's internal temperature, wraps up the insulation materials such as heat insulation asbestos by peripheral pressure chamber with bottom, has improved the efficiency of heating surface, has effectively guaranteed the homogeneity of temperature.
5, the present invention can realize low temperature control, also can realize higher temperatures control, and temperature-control range is-10 ℃～50 ℃, and having solved existing three axle attemperating units only can cryogenic refrigeration or the deficiency of high-temperature heating.
6, existing three-shaft high-low temperature control technology is the temperature that changes three axle equipment or pressure chamber environment of living in, equipment is placed in to constant temperature enclosure or constant temperature oven in pressure chamber's outer cup, but it is high and be not suitable for personnel's long period of experiments operation that the former need carry out temperature control improvement expenses to whole laboratory, the latter or be that external imported product price is high, otherwise overall volume is large and test operation space is little is not easy to operation.Compare, the present invention is that economy does not account for again volume.
7, the present invention is reasonable in design, simple for structure, easy to operate, and measurement and the control of temperature realize robotization, and temperature control control accuracy ± 0.2 ℃.
Accompanying drawing explanation
Fig. 1 is high low temperature triaxial test attemperating unit structural representation;
Fig. 2 is the vertical view of pressure chamber's top cover of Fig. 1.
In figure: 1-temperature measurement-control instrument; The outlet of 2-refrigerating fulid; 3-temperature sensor; 4-refrigerating fulid outlet valve; 5-temperature sensor probe joint; 6-" O " RunddichtringO; 7-copper tube joint; 8-" O " RunddichtringO; 9-nut; 10-pressure chamber top cover; 11-conical gasket; 12-gland nut; 13-spirality copper tube; 14-pull bar; 15-thermofin; 16-organic glass cylinder; 17-base; 18-gland nut; 19-conical gasket; 20-" O " RunddichtringO; 21-copper tube joint; 22-refrigerating fulid imported valve; The import of 23-refrigerating fulid; 24-solenoid valve; 25-refrigerating fulid supply port; 26-refrigerating fulid refluxing opening; 27-cooling/heating source.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention and Relational Questions are described in further detail.
As shown in Figure 1, a kind of high low temperature triaxial test attemperating unit of the present invention, comprises triaxial cell, temperature control system.
Triaxial cell comprises top cover 10, organic glass cylinder 16, nut 9, pull bar 14, base 17; The top cover 10 of organic glass cylinder 16 adopts nut 9 to screw pull bar 14 with base 17 to be connected.Organic glass cylinder 16 outer walls, top cover 10 tops, base 17 bottoms also arrange asbestos thermofin 15, to prevent that pressure chamber's internal temperature scatters and disappears.
Temperature control system comprises temperature measurement-control instrument 1, solenoid valve 24, temperature sensor 3, spirality copper tube 13, cooling/heating source 27.
Temperature measurement-control instrument 1 is digital display type intelligent measurement and control of temperature instrument, has that preset, the high limit of lower bound is preset, the function of observing and controlling, is connected with temperature sensor 3, solenoid valve 24 by wire; Solenoid valve 24 is Japanese SMC admission valve, and maximum working pressure (MWP) is hydraulic pressure 2.5MPa, flow aperture 3mm.Temperature measurement-control instrument 1 receives after temperature sensor signal, according to preset temperature limit, solenoid valve is sent to instruction, thereby controls the open and-shut mode of solenoid valve.
Cooling/heating source 27 is the customization of professional refrigerating machine producer, adopts imported compressor, 210 liters of volumes, circular flow 2.5T/h, and is provided with electrothermal tube, takes into account refrigeration and heating function simultaneously; The refrigerating fulid supply port 25 in cooling/heating source 27 passes through solenoid valve 24 by pipeline, be connected with refrigerating fulid import 23, the open and-shut mode of solenoid valve 24 is determining whether refrigerating fulid circulates in pipeline, refrigerating fulid imported valve 22 is set on the pipeline of refrigerating fulid import 23, and valve-off can stop the output of refrigerating fulid; The refrigerating fulid refluxing opening 26 in cooling/heating source 27 is connected with refrigerating fulid outlet 2, on the pipeline of refrigerating fulid outlet 2, refrigerating fulid outlet valve 4 is set, and valve-off can stop flowing of refrigerating fulid.For guaranteeing pressure chamber's temperature control effect, cooling/heating source and pressure chamber's distance are unsuitable long, should consider that cooling/heating source and triaxial cell approach as far as possible when the layout of laboratory.The temperature-control range of temperature control system is-10 ℃～50 ℃, accuracy of temperature control ± 0.2 ℃, and temperature replaces confined pressure water to test with refrigerating fulid during lower than 0 ℃.
Test unit concrete operation step of the present invention is as follows:
1, sample preliminary work, carries out test temperature adjustment to the sample preparing, and sample is placed to 24h in constant temperature (temperature controlling value ± 0.2 ℃) tank before test and is guaranteed that the temperature of whole sample is even.
2, within 12 hours, open cooling/heating source current in advance, set the temperature of refrigerating fulid supply source, test temperature during lower than room temperature set temperature generally low 5 ℃ than test temperature, test temperature during higher than room temperature set temperature generally high 5 ℃ than test temperature.
3,, after sample installs, the pressure chamber of parcel insulating layer of asbestos on cover, or treat Zhao Shanghou pressure chamber of pressure chamber outer wall, top cover, bottom parcel asbestos insulation material, toward the de aerated water or the refrigerating fulid that inject prefabricated test temperature in pressure chamber.
4, by high limit, preset test temperature ± 0.2 ℃ that is made as respectively of lower bound of temperature measurement-control instrument, open the valve of refrigerating fulid import and export, refrigerating fulid circulates in cooling/heating source, spirality copper tube.Test temperature is during lower than room temperature, if pressure chamber's temperature higher than temperature measurement-control instrument design temperature, temperature controller control solenoid valve is opened, refrigerating fulid enters by circulating line in the spiral copper pipe of inside, pressure chamber, by cold cycling, makes pressure chamber's temperature reach design temperature; Test temperature is during higher than room temperature, by solenoid valve and temperature measurement-control instrument reversal connection, if pressure chamber's temperature is lower than temperature measurement-control instrument design temperature, temperature controller control solenoid valve is opened, refrigerating fulid enters by circulating line in the spiral copper pipe of inside, pressure chamber, by cold cycling, makes pressure chamber's temperature reach design temperature, temperature controller control closed electromagnetic valve, thus reach the object of pressure chamber's temperature closed loop control.
5, until the stable reading of 30min temperature sensor after test temperature, can carry out that three follow-up axles are quiet, power or creep test, measured related data is the current Rock And Soil index of correlation setting at temperature.In whole process of the test, controlled pressure chamber water temperature is test temperature ± 0.2 ℃.
6, after off-test, close the valve of refrigerating fulid import and export, prevent that refrigerating fulid from leaking, if the long period is not used attemperating unit should close the switch in cooling/heating source.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any belong to those skilled in the art the present invention disclose technical scope in; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (10)
1. a high low temperature triaxial test attemperating unit, comprises triaxial cell, temperature control system;
It is characterized in that: described triaxial cell comprises top cover (10), organic glass cylinder (16), nut (9), pull bar (14), base (17); The top cover (10) of described organic glass cylinder (16) screws pull bar (14) with base (17) employing nut (9) and is connected;
Described temperature control system comprises temperature measurement-control instrument (1), temperature sensor (3), spirality copper tube (13), solenoid valve (24), cooling/heating source (27); Described temperature sensor (3) lower end probe is placed in the organic glass cylinder (16) of triaxial cell, upper end is connected with temperature measurement-control instrument (1) by wire, and solenoid valve (24) is also connected with temperature measurement-control instrument (1) by wire; Described spirality copper tube (13) is arranged on organic glass cylinder (16) Nell wall of triaxial cell, spirality copper tube (13) one ports are refrigerating fulid import (23), another port is refrigerating fulid outlet (2), described refrigerating fulid import (23) is connected with the refrigerating fulid supply port (25) of cooling/heating source (27) by solenoid valve (24), and refrigerating fulid outlet (2) is connected with the refrigerating fulid refluxing opening (26) of cooling/heating source (27).
2. high low temperature triaxial test attemperating unit according to claim 1, it is characterized in that: the insulation materials such as described organic glass cylinder (16) outer wall, top cover (10) top, base (17) bottom also arrange thermofin (15), and described thermofin (15) is asbestos.
3. high low temperature triaxial test attemperating unit according to claim 1, it is characterized in that: described temperature sensor (3) inserts pressure chamber inside by sensor probe through pressure chamber's top cover (10) by joint (5), joint (5) bottom arranges one " O " RunddichtringO (6).
4. high low temperature triaxial test attemperating unit according to claim 1, is characterized in that: described spirality copper tube (13) is close to organic glass infuser (16) inwall, adopts the even coiling of Φ 8 copper tube to form, the deburring of aperture, end.
5. high low temperature triaxial test attemperating unit according to claim 4, it is characterized in that: the two ends of described spirality copper tube (13) are from bottom to top respectively by gland nut (12,18), cone seal packing ring (11,19), by joint (7,21) hermetically passing pressure chamber top cover (10).
6. high low temperature triaxial test attemperating unit according to claim 1, it is characterized in that: described temperature measurement-control instrument (1) is digital display type intelligent measurement and control of temperature instrument, have that preset, the high limit of lower bound is preset, the function of observing and controlling, be connected with temperature sensor (3), solenoid valve (24) by wire.
7. high low temperature triaxial test attemperating unit according to claim 1, it is characterized in that: on the pipeline of described refrigerating fulid outlet (2), a refrigerating fulid outlet valve (4) is set, is then connected with the refrigerating fulid refluxing opening (26) of cooling/heating source (27).
8. high low temperature triaxial test attemperating unit according to claim 1, it is characterized in that: a refrigerating fulid imported valve (22) is set on the pipeline of described refrigerating fulid import (23), and then pipeline is connected with the refrigerating fulid supply port (25) of cooling/heating source (27) through solenoid valve (24).
9. high low temperature triaxial test attemperating unit according to claim 8, is characterized in that: described solenoid valve (24) is Japanese SMC admission valve, and maximum working pressure (MWP) is hydraulic pressure 2.5MPa, flow aperture 3mm.
10. high low temperature triaxial test attemperating unit according to claim 1, is characterized in that: the volume in described cooling/heating source (27) is 210L, circular flow 2.5m
3/ h, and be provided with electrothermal tube, take into account refrigeration and heating function simultaneously.
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| CN201410120123.9A CN103885496A (en) | 2014-03-28 | 2014-03-28 | High and low temperature triaxial test temperature control device |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105699010A (en) * | 2014-11-28 | 2016-06-22 | 中国石油天然气股份有限公司 | Constant temperature control box for electronic pressure gauge calibration and electronic pressure gauge calibration system |
| CN106769563A (en) * | 2016-12-12 | 2017-05-31 | 中国科学院武汉岩土力学研究所 | The Triaxial tester and its method of soil body Frozen-thawed cycled dynamic load coupling |
| CN106908084A (en) * | 2017-03-27 | 2017-06-30 | 北京航天控制仪器研究所 | A kind of band temperature control box three-axle table of high-accuracy multifunctional |
| CN107014685A (en) * | 2017-04-14 | 2017-08-04 | 南京林业大学 | The Triaxial tester and its test method of a kind of achievable local temperature control |
| CN107907400A (en) * | 2017-10-19 | 2018-04-13 | 青海大学 | A kind of temperature control ess-strain triaxial apparatus |
| CN108181006A (en) * | 2017-11-22 | 2018-06-19 | 西安应用光学研究所 | A kind of double winding constant temperature black matrix |
| CN109406302A (en) * | 2018-12-27 | 2019-03-01 | 贵州理工学院 | A kind of manual portable soil triaxial apparatus |
| CN109900544A (en) * | 2019-02-28 | 2019-06-18 | 河海大学 | A kind of triaxial test system that can simulate complex environment and stress |
| CN110470085A (en) * | 2019-07-30 | 2019-11-19 | 中国矿业大学 | Three axis of one kind have pressure to freeze ice making method |
| CN114489178A (en) * | 2022-01-17 | 2022-05-13 | 上海卫星工程研究所 | Satellite-borne infrared radiation calibration source large-range temperature change control device for sun synchronous orbit satellite |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105699010A (en) * | 2014-11-28 | 2016-06-22 | 中国石油天然气股份有限公司 | Constant temperature control box for electronic pressure gauge calibration and electronic pressure gauge calibration system |
| CN106769563A (en) * | 2016-12-12 | 2017-05-31 | 中国科学院武汉岩土力学研究所 | The Triaxial tester and its method of soil body Frozen-thawed cycled dynamic load coupling |
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| CN107014685A (en) * | 2017-04-14 | 2017-08-04 | 南京林业大学 | The Triaxial tester and its test method of a kind of achievable local temperature control |
| CN107907400A (en) * | 2017-10-19 | 2018-04-13 | 青海大学 | A kind of temperature control ess-strain triaxial apparatus |
| CN108181006A (en) * | 2017-11-22 | 2018-06-19 | 西安应用光学研究所 | A kind of double winding constant temperature black matrix |
| CN109406302A (en) * | 2018-12-27 | 2019-03-01 | 贵州理工学院 | A kind of manual portable soil triaxial apparatus |
| CN109406302B (en) * | 2018-12-27 | 2023-09-26 | 贵州理工学院 | Manual portable soil triaxial apparatus |
| CN109900544A (en) * | 2019-02-28 | 2019-06-18 | 河海大学 | A kind of triaxial test system that can simulate complex environment and stress |
| CN110470085A (en) * | 2019-07-30 | 2019-11-19 | 中国矿业大学 | Three axis of one kind have pressure to freeze ice making method |
| CN114489178A (en) * | 2022-01-17 | 2022-05-13 | 上海卫星工程研究所 | Satellite-borne infrared radiation calibration source large-range temperature change control device for sun synchronous orbit satellite |
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