CN103293182A - Automatic heat conductivity coefficient tester through protective heat flow meter method and detection method - Google Patents
Automatic heat conductivity coefficient tester through protective heat flow meter method and detection method Download PDFInfo
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- CN103293182A CN103293182A CN2013101785527A CN201310178552A CN103293182A CN 103293182 A CN103293182 A CN 103293182A CN 2013101785527 A CN2013101785527 A CN 2013101785527A CN 201310178552 A CN201310178552 A CN 201310178552A CN 103293182 A CN103293182 A CN 103293182A
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Abstract
The invention provides an automatic heat conductivity coefficient tester through a protective heat flow meter method. According to the tester, due to the motion of a piston rod in a cylinder of a pneumatic device, a hot plate and a thermal protection furnace of a testing stack body are lifted; a supporting sleeve is arranged on the outer side of a cold plate and a cold plate fixing seat; a heat flux transducer is arranged on the lower end face of the upper supporting sleeve; an electric signal obtained by the heat flux transducer is transmitted to a control unit for performing analytical control; the control unit is connected with the pneumatic device and controls the motion of the piston rod in the cylinder of the pneumatic device. The invention also provides a method for detecting the automatic heat conductivity coefficient tester through the protective heat flow meter method. The tester has the effects that the heat flux transducer is protected and is prevented from being damaged by pressing, the automatic lifting operation of the testing stack body can be realized, complicated manual operation is avoided, and the measurement precision of the heat conductivity coefficient of thermal insulation and insulating materials and the repeatability of instrument measurement are improved. The tester is suitable for manufacturing enterprises, institutions of higher learning, research institutions and other units for the thermal insulation and insulating materials.
Description
Technical field
The present invention relates to a kind of protective hot flowmeter method thermal conductivity measuring apparatus, particularly a kind of protective hot flowmeter method coefficient of heat conductivity automatic analyzer and detection method.
Background technology
Coefficient of heat conductivity is to weigh the thermal conduction characteristic of thermal insulation material and insulation material and the important parameter of heat-insulating property, and it is the key index of weighing and differentiate material heat radiation and heat-insulating capability.Thermal insulation material and insulation material are applied to all trades and professions, and such as building, metallurgy, military project, Aero-Space etc., the height of its performance is to determine by the coefficient of heat conductivity of material itself is big or small.So the accurate measurement as important parameter-coefficient of heat conductivity of weighing thermal insulation material and performance of heat protective material has important practical significance for modern production.
The coefficient of heat conductivity assay method mainly is divided into transient state method and steady state method, have the big of measurement range as a kind of method protective hot flowmeter method in the middle of the steady state method, can the MEASUREMENTS OF THIN material, the characteristics of small sample material, realization is to the measurement of big coefficient of heat conductivity material, and this has very important value for scientific research and production practices.
The conductometer based on the heat flow meter method that present stage maintains the leading position mainly is foreign products, and with regard to the current situation of domestic Related product, technology is far immature, and poor reliability simultaneously.Heat flux sensor can not bear very big pressure; and present stage, heat flux sensor was to stick on the cold drawing with heat conductive silica gel; if adhere to not tight; can be taken away original position by hot plate or test specimen; because heat flux sensor is littler than hot plate or cold drawing size; when heat flux sensor when the packing material coefficient of heat conductivity has gap on every side; hot-fluid is in downward transmittance process; the hot-fluid line can be offset; thereby cause the generation of thermal contact resistance, the mean heat flux that the heat flow density that heat flux sensor is measured can deviation theory, and present stage heat protection stove and hot plate need use hand-operated lifting; complex operation, automation degree of equipment is low.Therefore design a kind of high precision protective hot flowmeter method coefficient of heat conductivity automatic assay instrument with protection heat flux sensor function and have significant values.
Summary of the invention
At not enough on the prior art structure, the purpose of this invention is to provide a kind of protective hot flowmeter method coefficient of heat conductivity automatic analyzer and detection method, to reach the reasonable installation that realizes heat flux sensor and the purpose of protecting heat flux sensor, prevent from being taken away original position by crushing or quilt; And adopt scaling method to reduce because the thermal conductivity measurement error that thermal contact resistance and the skew of hot-fluid line cause, raising thermal conductivity measurement precision; Further improve the automaticity of analyzer simultaneously, the automatic lifting of the hot plate of realization test stack body and heat protection stove reduces manually-operated, and raising is to the measuring accuracy of the coefficient of heat conductivity of insulation and thermal insulation material and the repetition reliability of apparatus measures.
For achieving the above object, the technical solution used in the present invention provides a kind of protective hot flowmeter method coefficient of heat conductivity automatic analyzer, wherein: this analyzer comprises control module and instrument unit, the instrument unit includes supporting structure, the test stack body is installed in the described supporting structure, and the test stack body comprises hot plate, cold drawing, heat protection stove, and wherein cold drawing is fixed on the cold drawing holder, hot plate is fixed on the hot plate holder, and heat protection fender is in the periphery setting of hot plate and cold drawing; It is characterized in that: pneumatic means is installed above described supporting structure, the cylinder of pneumatic means, piston rod link to each other successively with small end, the connecting rod lower end links to each other with heat protection stove with the hot plate holder of test stack body, the lower surface of the support set outside the cold drawing of test stack body is provided with heat flux sensor, fills Heat Conduction Material around heat flux sensor; The resulting electric signal of described heat flux sensor is sent to and carries out analysis and Control on the control module, and described control module links to each other with pneumatic means, and the piston rod movement of the cylinder of pneumatic means is controlled.
A kind of detection method of protective hot flowmeter method coefficient of heat conductivity automatic analyzer also is provided simultaneously.
Effect of the present invention is this analyzer protection heat flux sensor; avoid heat flux sensor to take away original position by crushing or by hot plate or test specimen; reduce owing to heat flux sensor is installed the thermal conductivity measurement error that causes; improve the thermal conductivity measurement precision; realize the automation mechanized operation of analyzer simultaneously; avoid manually operated loaded down with trivial details; realize automation mechanized operation and measurement; improve repeatability and the automaticity of instrument; and it is simple in structure; operation is easily learned, and also can grasp method of operating rapidly even without the personnel of operating experience, is conducive to the popularization of analyzer.
Description of drawings
Fig. 1 is analyzer physical construction synoptic diagram of the present invention;
Fig. 2 is that analyzer physical construction of the present invention is to test specimen detected state synoptic diagram;
Fig. 3 is the schematic side view that heat flux sensor of the present invention is installed;
Fig. 4 is analyzer pneumatic control block diagram of the present invention;
Fig. 5 is analyzer electrical control block diagram of the present invention.
Among the figure:
1, cylinder 2, cylinder supports frame 3, support frame 4, heat protection stove 5, hot plate holder 6, heat flux sensor 7, cold drawing 8, cold drawing holder 9, heat protection stove pad 10, piston rod 11, nut 12, connecting rod 13, universal joint 14, hot plate 15, test test specimen 16, upper support cover 17, lower support cover 18, pedestal 19, motor 20, air lift pump 21, high-pressure cylinder 22, reversal valve 23, variable valve 24, packing material
Embodiment
By reference to the accompanying drawings protective hot flowmeter method coefficient of heat conductivity automatic analyzer of the present invention and detection method are described further.
Protective hot flowmeter method coefficient of heat conductivity automatic analyzer of the present invention adopts is protective hot flowmeter method in the one-dimensional stable method, according to Fourier's one-dimensional stable heat conduction model, by measuring the coefficient of heat conductivity that heat flow density, sample temperature difference and sample thickness calculate material.Basic calculation is as follows:
In the formula, R is test test specimen thermal resistance value, and Δ T is the test test specimen upper and lower surface temperature difference, and q is heat flow density, and h is the test specimen thickness, and λ is test test specimen thermal conductivity value.
Protective hot flowmeter method coefficient of heat conductivity automatic analyzer of the present invention, its structure as shown in Figure 1, 2, this analyzer comprises instrument unit and control module, wherein the instrument unit is made up of test stack body, pneumatic means, automatic temperature control apparatus, heat flux sensor, supporting structure, and control module is made up of interconnective host computer, motor, communication module, control module.In supporting structure 3 inside the test stack body is installed, the cylinder 1 of pneumatic means is installed above supporting structure 3, the cylinder 1 of pneumatic means, piston rod 10 links to each other successively with connecting rod 12 upper ends, connecting rod 12 lower ends link to each other with the hot plate holder 5 of test stack body, heat protection stove 4 links to each other with connecting rod 12 clearance fit, drive the automatic lifting of hot plate 14 and the heat protection stove 4 of test stack body by the motion of piston rod 10, heat flux sensor 6 is installed in the cold drawing 7 outer upper supports of test stack body and overlaps 16 lower surface, support set 16 is resisted downward pressure and is protected heat flux sensor 6, is filled with Heat Conduction Material around heat flux sensor 6; Heat flux sensor 6 resulting electric signal are sent to and carry out analyzing and processing on the control module.The hot plate 14 of test stack body, cold drawing 7, heat protection stove 4 all have mounting hole; the sensor of automatic temperature control apparatus is located in the mounting hole of test stack body; the sensor electrical signal of automatic temperature control apparatus is sent in the control module; temperature through control module analysis and Control test stack body; control module links to each other with the instrument unit of analyzer by communication module; control module links to each other with pneumatic means, and cylinder piston rod 10 motions of pneumatic means are controlled.
Described pneumatic means comprises cylinder 1, reversal valve 22, variable valve 23 and high-pressure cylinder 21 etc., wherein cylinder 1 is fixedly mounted on supporting structure 3 tops by cylinder supports frame 2, and be connected to form gas return path with variable valve 23, reversal valve 22 and high-pressure cylinder 21 successively by airtight tracheae, reversal valve 22 admission lines link to each other with high-pressure cylinder, reversal valve 22 links to each other with control module, high-pressure cylinder 21 links to each other with air lift pump 20, and air lift pump is driven by motor 19.
The test stack body comprises hot plate 14, cold drawing 7, heat protection stove 4, and hot plate 14, cold drawing 7 are generally cylindrical, and general size is slightly larger than the physical dimension of heat flux sensor 6.Wherein cold drawing 7 is fixed on the cold drawing holder 8; hot plate 14 is fixed on the hot plate holder 5; hot plate holder and cold drawing holder play a part fixing and support hot plate and cold drawing; described connecting rod 12 lower ends link to each other with hot plate holder 5 by universal joint 13; connecting rod 12 upper ends are rigidly connected with the piston rod 10 of cylinder by nut 11; connecting rod 12 links to each other with heat protection stove 4 clearance fit; there is step connecting rod 12 lower ends; the step overall diameter is greater than the internal diameter of the upper port of heat protection stove 4, and the upper surface of heat protection stove is positioned on the step.Heat protection stove 4 has improved accuracy and the repeatability of apparatus measures greatly for test environment provides the test environment of a temperature constant.
Described support set comprises upper support cover 16 and lower support cover 17, the lower support cover is installed in cold drawing 7 and cold drawing holder 8 peripheries, upper support cover 16 is installed in the top of lower support cover 17 and cold drawing 7, cold drawing holder 8 and lower support cover 17 are fixed on the pedestal 18, between the upper and lower support set heat insulation layer is installed, upper support cover 16 is to be made by the very little material of coefficient of heat conductivity, and heat flux sensor 6 sticks on the lower surface of upper support cover 16 by heat conductive silica gel.
Protective hot flowmeter method coefficient of heat conductivity automatic analyzer detection method of the present invention, this method is when detecting operation, described heat flux sensor 6 and upper support cover 16 closely contacts with cold drawing 7, around heat flux sensor 6, fill the Heat Conduction Material 24 that coefficient of heat conductivity and heat flux sensor 6 approach, such as selecting the thermal conductive silicon film, thickness is identical with heat flux sensor 6.Q is for passing to the mean heat flux of cold drawing, q under hot plate
1Be the heat flow density that heat flux sensor 6 is measured, the pass is between the two:
q=q
1(A
1+A
2λ
2/λ
1)/A
Wherein: λ
1Be the coefficient of heat conductivity of heat flux sensor 6, λ
2Be the coefficient of heat conductivity of packing material 24, A
1Be the area of heat flux sensor 6, A
2Be the area of packing material 24, A is cold drawing 7 total areas, makes a=(A
1+ A
2λ
2/ λ
1)/A, when heat flux sensor 6 with after packing material 24 is determined on every side, the value of a is constant.Title a is penalty constant, when test test specimen 15 environment temperatures change, and the heat flow density q that heat flux sensor 6 is measured
1Constantly change, can utilize formula q=q
1A obtains the heat flow density after the compensation, and then obtains the coefficient of heat conductivity of material.Demarcating back coefficient of heat conductivity computing formula is:
λ=q
1ah/ΔT
During measurement, test test specimen 15 is placed on the top of upper support cover 16.Upper support cover 16 and lower support cover 17 play protection heat flux sensor 6; upper support cover 16 plays a supportive role on the one hand; prevent heat flux sensor 6 by crushing, avoid test specimen sample 15 or hot plate 15 to contact with heat flux sensor 6 on the other hand, and taken away original position.
Described protection heat flow method thermal conductivity measuring apparatus, wherein the lifting of the heat of test stack body protection stove 4 and hot plate 14 all realizes by the motion of cylinder piston rod 10.Hot plate 14 is fixed on the hot plate holder 5, and hot plate holder 5 links to each other with connecting rod 12 by universal joint 13, and connecting rod 12 links to each other with piston rod 10 by nut 11.When piston rod 10 motions; drivening rod 12 and hot plate 14 liftings; when the step of connecting rod 12 lower ends runs into heat protection stove 4; because the step overall diameter is greater than the internal diameter size of the upper port of heat protection stove 4; connecting rod 12 will drive 4 liftings of heat protection stove, thereby realizes the lifting control to hot plate 14 and the heat protection stove 4 of test stack body.
Described control module links to each other with the instrument unit of analyzer by communication facilities, the sensor electrical signal of automatic temperature control apparatus is sent in the control module, measure the temperature of stack body through the control module analysis and Control, the resulting electric signal of heat flux sensor is sent on the control module to be handled, control module links to each other with pneumatic means simultaneously, and motor is controlled the cylinder piston rod motion of the cylinder of pneumatic means and the work of reversal valve by controlling.Control module and physical construction are combined closely, and realize the intelligent measuring process of instrument smoothly.
Application Example: the coefficient of heat conductivity of measuring certain test specimen sample
1, make test specimen:
The size of test test specimen 15 is by standard limited value, and to the size under the standard conditions arbitrarily, this protection heat flow method thermal conductivity measuring apparatus all can be tested.
2, connect power supply, sample be installed:
Connect power supply, open motor 19, make piston rod 10 drive hot plates 14 to rising, when being raised to a certain position, run into heat protection stove 4, drive heat protection stove 4 then just to rising.Until rising to the top, place test test specimen 15, be that piston rod 10 moves downward; when heat protection stove 4 moves downward the bottom and runs into heat protection stove pad 9,4 stop motions of heat protection stove, piston rod 10 drives hot plates 14 to be continued to move downward; after compressing test test specimen 15, piston rod 10 stop motions.
3, open test procedure, the temperature of hot plate 14, cold drawing 7 and heat protection stove 4 is set, environment temperature is arrived measure requirement.
4, the temperature of computer real-time monitoring hot plate 14, cold drawing 7, heat protection stove 4, and the output valve of heat flux sensor 6, and preserve automatically.
5 analyze data and print result, according to demarcating the coefficient of heat conductivity that differentiate hot coefficient formulas in back is obtained test specimen, finish the mensuration to material thermal conductivity, and bolt down procedure starts cylinder 1, take out test test specimen 15.
This protective hot flowmeter method coefficient of heat conductivity automatic analyzer has been realized protection and the automation mechanized operation function to heat flux sensor, has improved the repeatability of instrument, has simplified the operability of instrument.
Claims (6)
1. protective hot flowmeter method coefficient of heat conductivity automatic analyzer, this analyzer comprises control module and instrument unit, the instrument unit includes supporting structure, the test stack body is installed in the described supporting structure, the test stack body comprises hot plate, cold drawing, heat protection stove, wherein cold drawing is fixed on the cold drawing holder, and hot plate is fixed on the hot plate holder, and heat protection fender is in the periphery setting of hot plate and cold drawing; It is characterized in that: pneumatic means is installed above described supporting structure, the cylinder of pneumatic means, piston rod link to each other successively with small end, the connecting rod lower end links to each other with heat protection stove with the hot plate holder of test stack body, the lower surface of the support set outside the cold drawing of test stack body is provided with heat flux sensor, fills Heat Conduction Material around heat flux sensor; The resulting electric signal of described heat flux sensor is sent to and carries out analysis and Control on the control module, and described control module links to each other with pneumatic means, and the piston rod movement of the cylinder of pneumatic means is controlled.
2. protective hot flowmeter method coefficient of heat conductivity automatic analyzer according to claim 1, it is characterized in that: described pneumatic means also comprises reversal valve, variable valve and high-pressure cylinder, the cylinder of described pneumatic means links to each other with variable valve, reversal valve and high-pressure cylinder successively by airtight gas circuit and constitutes gas return path, the admission line of reversal valve links to each other with high-pressure cylinder, and reversal valve links to each other with described control module.
3. protective hot flowmeter method coefficient of heat conductivity automatic analyzer according to claim 1; it is characterized in that: the small end of described pneumatic means is rigidly connected by the piston rod of nut and cylinder; the connecting rod lower end links to each other with the hot plate holder by universal joint; connecting rod links to each other with heat protection stove clearance fit; be provided with step near the connecting rod lower end; stepped diameters is greater than the internal diameter of the upper port of heat protection stove, and the upper surface of heat protection stove is positioned on the step.
4. protective hot flowmeter method coefficient of heat conductivity automatic analyzer according to claim 1, it is characterized in that: the outer support set of described cold drawing comprises upper support cover and lower support cover, support set is installed in cold drawing and cold drawing holder periphery, cold drawing holder and lower support cover are fixed on the pedestal, the upper support cover is positioned on cold drawing and the upper support cover, between upper support cover, the lower support cover thermofin is installed, heat flux sensor sticks on the lower surface of upper support cover by heat conductive silica gel.
5. protective hot flowmeter method coefficient of heat conductivity automatic analyzer according to claim 1, it is characterized in that: described control module comprises interconnective host computer, motor, communication module, control module, control module links to each other with heat flux sensor by automatic temperature control apparatus in the instrument unit of communication module and analyzer, analyzing and processing is carried out in being sent to the heat flow density electric signal of cold drawing transmission by hot plate that heat flux sensor collects on the control module, control module links to each other with pneumatic means simultaneously, by direct motor drive air lift pump work, the cylinder piston rod motion of pneumatic means is controlled and the work of reversal valve by control module.
6. the detection method of protective hot flowmeter method coefficient of heat conductivity automatic analyzer according to claim 1, this method is when detecting operation, the heat flux sensor of described protective hot flowmeter method coefficient of heat conductivity automatic analyzer closely contacts with cold drawing with the upper support cover, the thickness of filling Heat Conduction Material around heat flux sensor is identical with heat flux sensor thickness, when the test test specimen, the heat flow density q that known heat flux sensor is measured
1, test specimen thickness h and test test specimen top and bottom temperature difference Δ T, calibrated coefficient of heat conductivity computing formula is:
λ=qh/ΔT=q
1ah/ΔT
In the formula: λ is the coefficient of heat conductivity of test test specimen, and q is for passing to the mean heat flux of cold drawing, q under hot plate
1The heat flow density of measuring for actual heat flux sensor, then q and q
1The pass is: q=q
1A, penalty constant a=(A
1+ A
2λ
2/ λ
1)/A, so:
q=q
1(A
1+A
2λ
2/λ
1)/A
λ wherein
1Be the coefficient of heat conductivity of heat flux sensor, λ
2For filling the coefficient of heat conductivity of Heat Conduction Material, A
1Be the area of heat flux sensor, A
2For filling the area of Heat Conduction Material, A is the cold drawing total area.
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Cited By (14)
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| CN103529076A (en) * | 2013-10-31 | 2014-01-22 | 中国科学院寒区旱区环境与工程研究所 | Automatic temperature control device for measuring heat conductivity coefficient |
| CN103868948A (en) * | 2014-02-26 | 2014-06-18 | 天津大学 | Method for correcting heat exchange power of heat conductivity tester through single-test piece guarded hot plate method |
| CN103983660A (en) * | 2014-04-30 | 2014-08-13 | 中国科学院武汉岩土力学研究所 | Indoor rock sample heat conduction coefficient testing device |
| CN106442613A (en) * | 2016-09-22 | 2017-02-22 | 西华大学 | Bench and method for testing heat conductivity coefficient of heat exchange tube of EGR cooler |
| CN107966471A (en) * | 2017-11-14 | 2018-04-27 | 东南大学 | A kind of in-situ testing device and test method of soil body thermal conductivity and geothermic gradient |
| CN108508059A (en) * | 2018-04-12 | 2018-09-07 | 滁州银兴新材料科技有限公司 | A kind of online quick conductive coefficient detection device with temperature compensation function |
| CN108844993A (en) * | 2018-06-28 | 2018-11-20 | 广州市建筑科学研究院有限公司 | A method of for correcting enclosure structure heat transfer coefficient on-site test result |
| CN108884847A (en) * | 2016-04-08 | 2018-11-23 | 株式会社电装 | Monitoring arrangement |
| CN109142431A (en) * | 2018-07-19 | 2019-01-04 | 芜湖籁余新能源科技有限公司 | A kind of Guarded hot plate heat conductivity measuring device |
| CN109269682A (en) * | 2018-09-27 | 2019-01-25 | 北京遥测技术研究所 | A kind of caliberating device and scaling method of heat flow transducer |
| CN110168356A (en) * | 2017-01-16 | 2019-08-23 | 三菱电机株式会社 | Pyroconductivity measurement device and pyroconductivity measuring method |
| CN111707706A (en) * | 2020-06-04 | 2020-09-25 | 西安交通大学 | Heat flux density measuring device with thermal radiation shield and method |
| CN113376207A (en) * | 2021-06-07 | 2021-09-10 | 长安大学 | Over-and-under type coefficient of heat conductivity test instrument of constant temperature basin |
| CN113484362A (en) * | 2021-08-30 | 2021-10-08 | 清华大学 | Method for correcting heat transfer area of heat conductivity coefficient tester |
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| CN103529076A (en) * | 2013-10-31 | 2014-01-22 | 中国科学院寒区旱区环境与工程研究所 | Automatic temperature control device for measuring heat conductivity coefficient |
| CN103868948A (en) * | 2014-02-26 | 2014-06-18 | 天津大学 | Method for correcting heat exchange power of heat conductivity tester through single-test piece guarded hot plate method |
| CN103868948B (en) * | 2014-02-26 | 2016-08-17 | 天津大学 | The modification method of the hot exchange power of single test specimen Guarded hot plate Conduction Coefficient Detector Basing |
| CN103983660A (en) * | 2014-04-30 | 2014-08-13 | 中国科学院武汉岩土力学研究所 | Indoor rock sample heat conduction coefficient testing device |
| CN108884847B (en) * | 2016-04-08 | 2020-07-31 | 株式会社电装 | Monitoring device |
| CN108884847A (en) * | 2016-04-08 | 2018-11-23 | 株式会社电装 | Monitoring arrangement |
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| CN110168356B (en) * | 2017-01-16 | 2022-08-02 | 三菱电机株式会社 | Thermal conductivity measuring device and thermal conductivity measuring method |
| CN110168356A (en) * | 2017-01-16 | 2019-08-23 | 三菱电机株式会社 | Pyroconductivity measurement device and pyroconductivity measuring method |
| CN107966471A (en) * | 2017-11-14 | 2018-04-27 | 东南大学 | A kind of in-situ testing device and test method of soil body thermal conductivity and geothermic gradient |
| CN108508059A (en) * | 2018-04-12 | 2018-09-07 | 滁州银兴新材料科技有限公司 | A kind of online quick conductive coefficient detection device with temperature compensation function |
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| CN109142431A (en) * | 2018-07-19 | 2019-01-04 | 芜湖籁余新能源科技有限公司 | A kind of Guarded hot plate heat conductivity measuring device |
| CN109269682A (en) * | 2018-09-27 | 2019-01-25 | 北京遥测技术研究所 | A kind of caliberating device and scaling method of heat flow transducer |
| CN109269682B (en) * | 2018-09-27 | 2021-10-01 | 北京遥测技术研究所 | Calibration device and calibration method of heat flow sensor |
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