CN200962094Y - Heat conduction coefficient measurement device of intelligent temperature-preservation material - Google Patents
Heat conduction coefficient measurement device of intelligent temperature-preservation material Download PDFInfo
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- CN200962094Y CN200962094Y CN 200620026218 CN200620026218U CN200962094Y CN 200962094 Y CN200962094 Y CN 200962094Y CN 200620026218 CN200620026218 CN 200620026218 CN 200620026218 U CN200620026218 U CN 200620026218U CN 200962094 Y CN200962094 Y CN 200962094Y
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Abstract
The utility model relates to a heat conductivity coefficient measurement for the heat proof and insulating material the industry and construction field, specifically to an intelligent heat conductivity coefficient measuring device for the heat insulating material which provides a heat conductivity coefficient measuring device for the heat insulating material with high measuring data precision and automatization degree. The utility model comprises a heat plate, a guard plate and a cold plate. A heat plate heater and a heat plate temperature sensor are arranged in the heat plate. A guard plate heater and a guard plate temperature sensor are arranged in the guard plate and the temperature of the guard plate follows the heat plate temperature change at any moment. A cold plate heater and a cold plate temperature sensor are arranged in the cold plate. Besides, a voltage transformer, a multi-path amplifier, a multi-path signal switching card and a computer are included. The heat conductivity coefficient measurement for the heat proof and insulating material is mainly used for the design and manufacture of the heat conductivity coefficient measuring device for the heat proof and insulating material the industry and construction field.
Description
Technical field
The coefficient of heat conductivity of industrial circle, building field insulation material (claiming temperature conductivity again) is to be used for weighing the thermal conduction characteristic of insulation material and the important parameter of heat-insulating property, and the utility model relates to above-mentioned thermal Conductivity Determination.Specifically, the utility model relates to intelligent heat preserving material thermal conductivity determinator.
Background technology
Thermal conductivity measuring apparatus is a kind of important material property analytical instrument, and its ultimate principle is based on the coefficient of heat conductivity that Fourier's heat transfer theory is measured material.Coefficient of heat conductivity is to be used for weighing the thermal conduction characteristic of heat proof material and the important parameter of heat-insulating property, and the performance of heat-resistant insulation material is by the coefficient of heat conductivity decision of material.Environment when the coefficient of heat conductivity of material depends on the composition, voidage, water absorptivity, water cut, inner structure of material and heat conduction and temperature etc. are all multifactor.
The world today, the energy has become a key factor of national security, economic stability.Energy savings becomes the people of the world's common voice.Heat-resistant insulation material is an important channel of energy savings.The accurate mensuration of coefficient of heat conductivity is for the exploitation of these heat-resistant insulation materials and produce significant.Thermal conductivity measuring apparatus is the performance of heat-resistant insulation material and the critical equipment of quality testing.Thermal conductivity measuring apparatus can be applied to metering and quality supervised department is used for the quality arbitration of material, be used for R﹠D institution and manufacturer and be used to develop new material, application can comprise automobile, environment, building, Aero-Space, national defence, sea floor exploration, antarctic investigation, seashore and port engineering, scientific research, exploitation and engineering design etc.
Developed country's thermal conductivity measuring apparatus technology is ripe relatively.The EKO company of the U.S. has very long history aspect the development of thermal conductivity instrument, and is in position advanced in the world always.The Hot Disk coefficient of heat conductivity instrument technical parameter that Sweden produces can reach:
Coefficient of heat conductivity scope: 0.005-500W/mK
Temperature range: 10K-1000K
In the product of these companies, middle-temperature section (20 ℃～100 ℃) has been taked the combination of the two dull and stereotyped and cooling technique of semiconductor in our project, also can realize the automatic thickness measurement of sample, particularly computer technology is used, and has improved the intelligent level of instrument greatly.For the more application of low temperature wave band, they adopt liquid nitrogen and liquid helium is that refrigerant can be with temperature quick adjustment between-263 ℃-1000 ℃.
Thermal conductivity measuring apparatus belongs to the material property surveying instrument, and China becomes in this respect for many years by unfrequented technology.The overall product level also belongs to the technology at the beginning of the eighties at the end of the seventies in last century.For example, the thermal conductivity measuring apparatus of certain domestic corporation's development has adopted the steady state measurement method, and its control section is an Analogical Circuit Technique, and data presentation adopts analogue instrument to show, needs artificial counting and hand computation.The temperature measurement range of this instrument is 10 ℃～100 ℃, and cooling technic adopts water-cooled, instrument heaviness, complexity, and operation and maintenance is all very difficult.
In in the past a lot of years, because material environment friendly characteristic and heat preservation property are not paid attention to by country and enterprise, and the backwardness of management system, the research and development of the enterprise of China in material thermal conductivity analyzer field are very scattered, systems not very, belong to dead state substantially.In recent years, implementation along with the friendly type of national sustainable development strategy, energy strategy and construction environmental protection society, quality testing part, institution of higher learning and R﹠D institution, the manufacture of materials enterprises etc. in each province and city increase sharply to the demand of material thermal conductivity analyzer, overseas enterprise constantly enters China in addition, the performance and the quality that begin that enterprise's emphasis ground exploitation is arranged or promote thermal conductivity measuring apparatus are as tianjin building instrument experiment machine factory.But, be subjected to technical force, management system and the influence of many-sided factor such as not enough that the innovation talent is paid attention to, do not succeed in developing all the time.
Summary of the invention
For overcoming the deficiencies in the prior art, the purpose of this utility model is: the intelligent heat preserving material thermal conductivity that a kind of measurement data is accurate, automaticity is high determinator is provided.
The technical solution adopted in the utility model is: intelligent heat preserving material thermal conductivity determinator comprises: hot plate, backplate and cold drawing, and hot plate inside is provided with the hot plate well heater, and two hot plate temperature sensors are equipped with in hot plate inside; Backplate inside is provided with and makes the hot plate heat and the external world not have heat interchange, guarantees that again backplate does not have heat to pass to the backplate well heater and the backplate temperature sensor of hot plate simultaneously, and the temperature of backplate is followed the tracks of hot plate temperature at any time and changed; Cold drawing interior arrangement cold drawing well heater, the cold drawing temperature sensor is equipped with in cold drawing inside; Comprise electric pressure converter, multichannel pmultiple amplifier, multiple signals transition card and computing machine in addition, temperature sensor is connected to computing machine by multi way temperature electric pressure converter, multichannel pmultiple amplifier and multiple signals transition card respectively, hot plate well heater, backplate well heater and cold drawing well heater link to each other with computing machine respectively, in hot plate, also be provided with power amplifier, power amplifier is connected to computing machine by multichannel pmultiple amplifier and multiple signals transition card, also comprises the height segmentation stepping and high segmentation stepper motor sample driving and the feedback control unit that are used to place test specimen.
Described hot plate is of a size of 200 * 200 (mm2).
Described cold drawing is of a size of 300 * 300 (mm2).
Described backplate is of a size of 300 * 300 (mm2).
Described computing machine is for carrying out the computing machine of following execution the following step:
Initial parameter is set: hot plate, cold drawing temperature, specimen thickness and area;
Read hot plate, cold drawing and backplate temperature sensor data respectively;
Judge whether hot plate, cold drawing and backplate be identical with the value of setting,, transmit heating signal to hot plate, cold drawing and backplate well heater if inequality;
Judge that whether hot plate, cold drawing and backplate be identical with the value of setting, reads hot plate, cold drawing and power amplifier data;
According to formula
Calculate the insulation material coefficient of heat conductivity, I is the electric current by well heater in the formula, and R is a heater resistance, and H is the thickness of test specimen, t
2Be hot plate temperature, t
1Be the cold drawing temperature, k is an integration constant, and A is the test specimen area;
Use the stepper motor of high segmentation that sample is driven, be pressed between cold drawing and the hot plate up to sample, compress stop signal by the pressure switch mechanism of design voluntarily, that has realized thickness of sample reads full-automatic operation with instrument automatically;
Show, print.
Described hot plate, cold drawing adopt the conductor refrigeration structure.
Describedly judge whether hot plate, cold drawing and backplate be identical with the value of setting, is meant the fuzzy control of realization to cold and hot plate temperature precision tracking, comprises the following steps:
Systematic analysis;
Determine the I/O physical quantity;
Determine controller architecture;
Determine membership function;
Set up rule base;
Determine operator and select deblurring method;
Simulation;
Judge whether to reach requirement.
The utility model possesses following effect: owing to adopted hot plate, cold drawing and guard board structure, and fuzzy control technology, thereby the utility model Measuring Time is short, speed is fast, data are accurate, the employing of computing machine, it is simple, quick that the utility model is used, the calculating of data acquisition and processing (DAP) and coefficient of heat conductivity, demonstration and printout, the full-automation of realization instrument, visual and intelligent.
Description of drawings
Fig. 1 structural plan figure, 1 is mainboard among the figure, and 2 is backplate, and 3 is cold drawing, and 4 is that backplate thermometer 1,5 is that mainboard thermometer 1,7 is that mainboard thermometer 2,8 is that cold drawing thermometer 1,9 is a cold drawing thermometer 2 for backplate thermometer 2,6.
Fig. 2 inner structure, 10 is test specimen among the figure, and 11 is the hot plate well heater, and 12 is the backplate well heater.
Fig. 3 heat transfer theory synoptic diagram.
Fig. 4 electricity functional-block diagram.
Fig. 5 program flow diagram.
Fig. 6 overall construction drawing, among the figure, the 101st, the sample feeding gauge tap that puts in place, 103 heating films, the 102nd, cold drawing drives accurate orienting sleeve, and the 104th, transmission precision leading screw, the 105th, the drive motor of feeding.
The structure of Fig. 7 fuzzy controller.
Fig. 8 The Design of Fuzzy Logic Controller flow process.
Embodiment
Further specify the utility model below in conjunction with drawings and Examples.
The utility model embodiment is intelligent thermal conductivity measuring apparatus
1, the overall design of intelligent thermal conductivity measuring apparatus and structural design
The intelligence conductometer is on the basis of present conductometer, and the modify-water circulation is cooled to the semiconductor cooling, has increased the automatic sample feed unit of stepper motor, therefore need carry out specific design to structure again on the basis of original steady state measurement method and pair plate techniques.Overall design comprises the design of design and development, computer data acquiring, demonstration and control system of research, system for detecting temperature and the tracker of the selection of the design of cold and hot plate structure, the design of feeding drives structure, instrument insulation material of intelligent thermal conductivity measuring apparatus and installation and design, configuration design, method for rapid cooling.Structural design is the part of overall design, mainly is the structural design at cold and hot plate layout, the support of cold and hot plate and mode of motion.
2, the design of high segmentation stepper motor sample driving and feedback control unit
From the computing formula of coefficient of heat conductivity as can be seen, the precision of coefficient of heat conductivity depends on the measuring accuracy of the temperature measurement accuracy of cold and hot plate and temperature tracking and control accuracy, thickness of sample.Therefore the sample thickness measuring accuracy is one of important parameter of decision thermal conductivity measurement precision.Adopt high segmentation stepper motor sample to drive with feedback control unit and not only can realize the auto-feed of sample, and can accurately record sample thickness, measuring accuracy reaches 1um.
The technological development that cooling technique of semiconductor is used in two plane table thermos:
Research contents comprises the Theoretical Calculation and the experimental study of heat transferred and power consumption between cold and hot plate and semiconductor cooling element, thereby determines the size and the power consumption of semiconductor cooling element, and formulates rational refrigeration structure.
The realization of the fuzzy control method of cold and hot plate temperature precision tracking
The front is mentioned, and the temperature measurement accuracy of cold and hot plate and temperature are followed the tracks of the measuring accuracy that is determining coefficient of heat conductivity with control accuracy.Traditional PID FEEDBACK CONTROL and semi-conductive dutycycle control method generally can only reach 0.5 ℃ measuring accuracy, can not satisfy the accurate Testing requirement of coefficient of heat conductivity.The temperature that fuzzy control method is used for thermal conductivity measuring apparatus is controlled, and has effectively improved temperature tracking velocity and precision, thereby has improved the measuring accuracy of instrument.Use fuzzy control method, can realize 0.1 ℃～0.5 ℃ even higher measuring accuracy.
The unify exploitation of software package of electronic system, department of computer science
The core of intelligent conductometer is with the electronic signal digitizing, and is input to computing machine, realizes the full automatic working of instrument by computer software.Concrete function comprises sample auto-feed and thickness measure, temperature data acquisition, modulus signal conversion, signal bandpass filtering, heating and cooling power calculating, fuzzy control, spectrogram demonstration, printout, warning etc.
The method of heat conducting coefficient measuring all is to be based upon on the basis of Fourier heat equation.The method of measuring can be divided into two big classes: steady state method and transient state method, what this instrument adopted is the stable state flat band method.
The general structure of intelligent thermal conductivity measuring apparatus as shown in Figure 6.The 101st, the sample feeding gauge tap that puts in place, 103 heating films, the 102nd, cold drawing drives accurate orienting sleeve, and the 104th, transmission precision leading screw, the 105th, the drive motor of feeding.Omitted in the overall construction drawing with current shown in parts with another part of hot plate 1 plane of symmetry, promptly also there is a cover in 101,102,103,104,105,3 parts such as grade at the opposite side of hot plate 1, thereby constitute two flat-panel systems.
Carry out the principle explanation with the sample size of 300mm * 300mm below.
Fig. 1 has provided planimetric map of the present utility model.Fig. 2 is the mutual alignment that heating plate-test specimen-cold drawing is placed.
The 1-hot plate: claim main heating furnace again, 200 * 200 (mm2), inner having heaters is the basic hot body of instrument.Supply with the test specimen heat.In main heating plate inside two temperature sensors-hot plate temperature meter 1 and hot plate temperature meter 2 are housed, are used for measuring hot plate temperature, the precision of temperature sensor is very high.
The 2-backplate: external dimensions is 300 * 300 (mm2), and inside dimension is 204 * 204 (mm2), and there is the backplate well heater inside.Protect the temperature of heating plate and follow the tracks of main temperature of heating plate variation at any time, its function is to make the hot plate heat and the external world not have heat interchange on the one hand, guarantees again that simultaneously protecting heating plate does not have heat to pass to main heating plate.Guarantee the hot-fluid uniflux of main heating plate and cold drawing.Protect heating plate inside two temperature sensors of high precision-backplate thermometer 1 and backplate thermometer 2 are housed, be used for measuring the backplate temperature.
Hot plate temperature sensor, backplate temperature sensor, cold drawing temperature sensor and water temperature control sensor amount to 7.Adopt multi-form respectively and high precision Pt100 temperature sensing element different structure.This element stability is good, precision is high, is fit to the two plane table thermos of DRP-6W fully.The temperature signal of temperature sensor is transferred to computing machine by multi way temperature electric pressure converter, multichannel pmultiple amplifier and multiple signals transition card, by the computing machine pickoff signals, and signal handled, changes, store, show, control, form complete a, TT﹠C system automatically
3-cold drawing 1: its be of a size of 300 * 300 (mm2) its size and backplate measure-alike.The interior arrangement calandria is so that heating.Temperature sensor is equipped with in inside, is used for measuring the temperature of cold drawing.
The 10-test specimen has two, and size is identical with backplate, 300 * 300 (mm2), standard thickness is 20mm, and full-size is not more than 50mm, is placed on respectively between hot plate and two cold drawings, can measure the coefficient of heat conductivity of two test specimens simultaneously, get the coefficient of heat conductivity of its mean value as this test specimen.
Fig. 3 has provided the heat transfer theory synoptic diagram.Structure from figure as can be seen, it is made of hot plate, backplate and two cold drawing three parts.Arrow is represented direction of heat flow among the figure, and as seen from the figure, the flow direction of heat flows to cold drawing from hot plate.(Fig. 3 a), the direction of hot-fluid changes at the edge of hot plate, and the variation of this direction of heat flow is called the edge effect of hot-fluid not having under the situation of backplate.If hot plate is little more a lot of than their diameters with the distance of cold drawing, can ignore the influence of edge effect.But actual test specimen and instrument and equipment can not satisfy this condition, and the distance of hot plate and cold drawing can not be too little, and its diameter again can not be too big, therefore, dreams up the embodiment of Fig. 3 b.
In Fig. 3 b, increased backplate.The effect of backplate is to make the edge hot-fluid line of hot plate not crooked.If the backplate temperature is consistent with hot plate temperature, then very little buckling phenomenon will take place in the hot-fluid line at the hot plate edge, like this, just edge effect will be reduced to very low degree.Obviously, the slit of hot plate and backplate is more little, and both temperature are approaching more, and then the edge effect influence is more little.In fact, the introducing of backplate is equivalent to hot plate and cold drawing distance than the little a lot of theory vision of its diameter.Therefore, this has just simplified heat transfer theory, can represent actual conditions of the present utility model with theoretical equation.
The steady heat conduction of the utility model intelligent heat preserving material thermal conductivity determinator under thermal equilibrium state.Have only under the heat-staple condition, just can obtain correct result.Steady state (SS) is good more, and measurement result is accurate more.
The effect of hot plate makes after the hot plate heating, heat energy can only folk prescription to conduction, promptly conduct to the cold drawing direction by hot plate.Because two cold drawings are arranged, therefore, heat energy is to positive and negative both direction parallel transmission.When test specimen was between hot plate and cold drawing, heat energy was transmitted to the cold drawing direction by test specimen by hot plate.
The heat that the hot plate well heater produces is:
Q＝UI (1)
In the formula,
U-is added in the voltage at well heater two ends
I-is by the electric current of well heater
If represent the resistance of well heater with R, then the heat that produces of well heater is:
Q＝I
2R (2)
According to the heat transfer theoretical analysis, the coefficient of heat conductivity of material is directly proportional with the thickness of material, and is added in the temperature difference of hot side to huyashi-chuuka (cold chinese-style noodles) and is inversely proportional to.
Following formula is carried out integration from the huyashi-chuuka (cold chinese-style noodles) to the hot side, can obtain under ideal conditions:
In the formula,
The thickness of H-plate material
t
2-hot plate temperature
t
1-cold drawing temperature
The k-integration constant
According to equation (2), (4), can obtain the material thermal conductivity equation:
Equation (5) is exactly the coefficient of heat conductivity equation, and wherein k is an instrument constant.
In the utility model, constant k=1, simultaneously, because two identical test specimens and two cold drawings are arranged, therefore, equation (5) is rewritten into,
Equation (6) is exactly the utility model basic calculating equation, in computation process, measures in the coefficient of heat conductivity process of material again, does not need to add any correction factor, just can draw correct result.Measurement result of this instrument and Theoretical Calculation are very approaching, and therefore, the measurement of DRY-300F is accurate, and Measuring Time is short, the automaticity height.Generally speaking, measuring 150 minutes temperature of test specimen just can balance, and measurement in 210 minutes finishes, and obtains correct result.This result can manually read record, also can go out measurement data with printer prints.
Fig. 4 has provided schematic block circuit diagram.
Temperature measuring circuit
Temperature survey is finished by a plurality of temperature sensors.Hot plate temperature sensor, backplate temperature sensor, cold drawing temperature sensor and water temperature control sensor amount to 7.Adopt multi-form respectively and high precision Pt100 temperature sensing element different structure.This element stability is good, precision is high, is fit to the utility model fully.The temperature signal of temperature sensor is transferred to computing machine by multi way temperature electric pressure converter, multichannel pmultiple amplifier and multiple signals transition card, by the computing machine pickoff signals, and signal handled, changes, store, show, control, form complete a, TT﹠C system automatically.
Use the stepper motor of high segmentation.Instruments design is an initial position of having set cold drawing, number of revolutions by the calculated step motor can calculate the distance that sample advances, can realize the auto-feed and the thickness precision measurement of sample, improve the measuring accuracy of instrument, avoid hand dipping and sample feeding.
The structural design of sample step motor drive part is seen Fig. 6.The driving governor of motor is selected the QA743035 drive template, and he integrates adjustable pulse generator, go in ring distribution, power drive.Can produce the adjustable clock signal of 30 ~ 350Hz voluntarily.Use the single direct supply that power supply≤24V need not voltage stabilizing.Directly drive part 35BYG series and 42BYG series stepper motor; And most of 15BY, 25BY, 35BY, 42BY series stepper motor and most of 28BYJ～35BYJ series stepper motor operation.Drive phase current less than≤1.2A.
Its FEEDBACK CONTROL provides the stagnation stop signal by the parts among Fig. 61, and parts 1 are travel switch in the present embodiment.Sample thickness information goes to take advantage of the length equivalent calculating of individual pulse to obtain by the digit pulse number that is transferred to stepper motor.
Last measurement result can be used printer prints.
Hot plate well heater, backplate well heater adopt special heater dedicated respectively.Characteristics with good stability.The control automatically of cold drawing temperature.Special heater dedicated be that cooling technique of semiconductor is used in two plane table thermos.Cooling technique of semiconductor is based on Po Er and pastes (Peltier) effect: when electric current flows through the closed-loop path of two kinds of conductors compositions, one node place heating (heat absorption), another node place turn cold (heat release), or when electric current with different directions during by metal and semiconductor joint, its contact position or heating or heat absorption.
When cooling technique of semiconductor is used for intelligent thermal conductivity measuring apparatus, we mainly according to conductor refrigeration following some:
(1) power: power supply 2v～15v, current sinking 3A-25A, maximum power dissipation is up to 120W.
(2) maximum voltage: the maximum voltage that allows to add surpasses this voltage and not only could not refrigeration could heat on the contrary generally at 0.8～15.4 volt! Physical dimension is more little, and this allows voltage also more little, and is little with thickness relationship.
(3) physical dimension is big more, and refrigerating capacity is big more, and same size generally is that thickness is thin more, and refrigerating capacity is big more, and corresponding electric current is also big more.
Temperature monitoring and control system program design:
The realization of the fuzzy control method of cold and hot plate temperature precision tracking
The fundamental difference of fuzzy control and general automatic control is do not need to set up precise math model, but the utilization fuzzy theory to be with people's experimental knowledge, thinking reasoning.The method of control procedure and strategy are to be realized by so-called fuzzy controller.Therefore, the core of Temperature Fuzzy Control in intelligent conductometer and feedback and tracking is a The Design of Fuzzy Logic Controller.The basic design scheme of temperature fuzzy controller now is described with the structure (Fig. 7) of a fuzzy controller
(1) systematic analysis: controlled temperature is carried out systematic analysis, determine the input variable x of controller
1, x
2With output variable y and their numerical value change scope with require the control accuracy that reaches etc., set up physical model according to the needs of real process, determine the controller architecture General layout Plan.
(2) selection of fuzzy method is with definite: so-called obfuscation, be exactly input variable numerical value, be transformed into the language value of fuzzy language variable, for example the cold drawing temperature is 90 ℃, be transformed into the language value (temperature " low ", " in ", " height "), the temperature amount be divided into honest (PL), center (PM), just little (PS), zero (ZE) negative little (NS), negative in (NM), negative big (NL) seven grades of linguistic variables.The corresponding fuzzy subset of each language value, its subordinate function is selected triangle or trapezoidal profile for use.Can determine the corresponding degree of membership of input value by subordinate function figure.
(3) foundation of fuzzy rule base: determine that the language control law is the core work of design of Fuzzy Controller, the form of rule " IF......THEN...... " conditional statement commonly used.The computing of inference rule relates to determining of fuzzy operator.Reasoning operational method commonly used is two kinds of operators of maximum---minimum and maximum---product.
(4) deblurring of output numerical value is handled so-called deblurring and is handled, be exactly will output the language fuzzy quantity, be returned to accurate numerical value, just the degree of membership with the fuzzy subset of output calculates definite numerical process.
(5) experiment of temperature is modified to the validity and the reliability of checking design theory and method, designed temperature fuzzy controller need be carried out strict experimental examination and be revised and adjust, both can onlinely measure in good time, also but off-line carries out l-G simulation test or Computer Simulation, whether reaches the expectant control target with the check The controller.If do not reach requirement, will carry out meticulous design again.
After determining fuzzy control scheme, can carry out software debugging and application experiment by selecting specialized hardware fuzzy controller (fuzzy chip).
Visual Basic is the very practical visual programming environment that Microsoft develops, and it uses very extensive at data analysis and aspects such as processing, interface display, and the software development environment of the software employing of this paper establishment is exactly Visual Basic 6.0.
Each passage of capture card is set to thermometric passage and pressurization passageway, sampling period is each thermometric passage of 3s. continuous sweep and sends computer back to and show, handle, program is regulated the output voltage of pressurization passageway automatically according to the relation of returning between temperature value and the setting value, and then the power of the heating plate of control hot plate, backplate and cold drawing, realize automatic temperature monitoring and thermostatic control.
The present embodiment experimental applications is as follows:
1, the making of test specimen:
Thickness H=20mm (standard), maximum is no more than 50mm
Diameter 300 * 300 ± 2 (mm * mm), flatness＜=0.005mm
2, test specimen is placed
1〉mobile cold drawing is near the specimen thickness position, and with the close hot plate of test specimen, mobile cold drawing is used with second test specimen of quadrat method placement to correct position (distance of hot plate and cold drawing equals specimen thickness);
2〉build loam cake locking.
Test specimen is placed and is finished, and prepares to begin test.
3, energized AC220v
4, computer operation
Open computer power supply, enter the main interface of operation automatically;
According to prompting, " enter " with click, enter and measure the interface;
Before formal the measurement, carry out following work:
(1) with click " unit ", the input organization;
(2) with click " name ", input testing crew name or code name;
(3) with click " test specimen title ", input test specimen title or numbering;
(4) with click " specimen thickness ", input actual (real) thickness value (mm);
(5) in " parameter is set " input cold drawing temperature (be higher than 5 ℃ of room temperatures, instrument is made as 30 ℃);
(6) at " parameter is set " input hot plate temperature (standard be cold drawing temperature+20 ℃);
(7) " begin test " with click, enter automatic running status, finish behind the 180Min, provide the result.
The utility model uses advanced software and hardware technology, by simply, computer interface is realized calculating, demonstration and the printout of Automatic Control, data acquisition and processing (DAP) and the coefficient of heat conductivity of instrument efficiently, has advantages such as Measuring Time is short, speed is fast, data are accurate, automaticity is high, noiselessness.The utility model can be widely used in manufacturing enterprise, correlated quality inspection department and the R﹠D institutions such as unit, institution of higher learning and research institute of insulation material.
The foundation (list of references) that gordian technique realizes
1, two flat band methods belong to steady heat conduction coefficient determination method, and ripe semiconductor refrigerating technology is applied to two plane table thermo technical feasibilities." semiconductor cooler principle and the application " that concrete application can be write according to Chen Zhen woods and Sun Zhongquan, microelectric technique (1999,27 (5): 63-65) relevant books with other.
2, fuzzy control technology is an important method of control technology, than PID control technology multiple advantage is arranged, and is much used in Industry Control.Being applied to fuzzy control technology in the thermal conductivity measuring apparatus based on heat transfer theory is a technological innovation, will improves the measuring accuracy and the speed of instrument.
3, the stepper motor of height segmentation is applied in the thermal conductivity measuring apparatus, improves the intelligent level of instrument, operate easylier, also can avoid artificial measuring error.The stepper motor technology maturation is used feasible.
Liu Zengliang, fuzzy technology and application a collection of selected materials, publishing house of BJ University of Aeronautics ﹠ Astronautics, the design/Hao Lihong of 1997 improved thermal insulation material coefficient of heat conductivity protective heat plate method TT﹠C system, Lin Ling etc. // Chinese journal of scientific instrument, 2003,24 (4 supplementary issues) ,-360～361,376.
Claims (5)
1. an intelligent heat preserving material thermal conductivity determinator is characterized in that, comprising: hot plate, backplate and cold drawing, and hot plate inside is provided with the hot plate well heater, and two hot plate temperature sensors are equipped with in hot plate inside; Backplate inside is provided with and makes the hot plate heat and the external world not have heat interchange, guarantees that again backplate does not have heat to pass to the backplate well heater and the backplate temperature sensor of hot plate simultaneously, and the temperature of backplate is followed the tracks of hot plate temperature at any time and changed; Cold drawing interior arrangement cold drawing well heater, the cold drawing temperature sensor is equipped with in cold drawing inside; Comprise electric pressure converter, multichannel pmultiple amplifier, multiple signals transition card and computing machine in addition, temperature sensor is connected to computing machine by multi way temperature electric pressure converter, multichannel pmultiple amplifier and multiple signals transition card respectively, hot plate well heater, backplate well heater and cold drawing well heater link to each other with computing machine respectively, in hot plate, also be provided with power amplifier, power amplifier is connected to computing machine by multichannel pmultiple amplifier and multiple signals transition card, also comprises the height segmentation stepping and high segmentation stepper motor sample driving and the feedback control unit that are used to place test specimen.
2. a kind of intelligent heat preserving material thermal conductivity determinator according to claim 1 is characterized in that described hot plate is of a size of 200 * 200 (mm2).
3. a kind of intelligent heat preserving material thermal conductivity determinator according to claim 1 is characterized in that described cold drawing is of a size of 300 * 300 (mm2).
4. a kind of intelligent heat preserving material thermal conductivity determinator according to claim 1 is characterized in that described backplate is of a size of 300 * 300 (mm2).
5. a kind of intelligent heat preserving material thermal conductivity determinator according to claim 1 is characterized in that, described hot plate, cold drawing adopt the conductor refrigeration structure.
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| CN101915778A (en) * | 2010-07-19 | 2010-12-15 | 中国建筑科学研究院 | Apparatus and method for measuring thermal coefficients by adopting guarded thermal plate method |
| CN102326071A (en) * | 2008-12-23 | 2012-01-18 | 原子能与替代能源委员会 | Be used for device and correlation technique that heat exchange coefficient is measured |
| CN104155021A (en) * | 2014-07-22 | 2014-11-19 | 山东省计量科学研究院 | Standard temperature measuring board for thermal conductivity meter |
| CN105021650A (en) * | 2015-08-11 | 2015-11-04 | 中国兵器工业集团第五三研究所 | Device for measuring heat conduction coefficient by means of guarded hot plate method |
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| CN101915778A (en) * | 2010-07-19 | 2010-12-15 | 中国建筑科学研究院 | Apparatus and method for measuring thermal coefficients by adopting guarded thermal plate method |
| CN104155021A (en) * | 2014-07-22 | 2014-11-19 | 山东省计量科学研究院 | Standard temperature measuring board for thermal conductivity meter |
| CN104155021B (en) * | 2014-07-22 | 2016-08-17 | 山东省计量科学研究院 | A kind of thermal conductivity factor instrument standard thermometric plate |
| CN105021650A (en) * | 2015-08-11 | 2015-11-04 | 中国兵器工业集团第五三研究所 | Device for measuring heat conduction coefficient by means of guarded hot plate method |
| CN105021650B (en) * | 2015-08-11 | 2018-03-02 | 中国兵器工业集团第五三研究所 | A kind of Guarded hot plate heat conductivity measuring device |
| CN106442609A (en) * | 2016-03-10 | 2017-02-22 | 上海众材工程检测有限公司 | Evaluation method for equivalent heat conductivity coefficient of solid-solid phase change thermal insulation material |
| CN106017713A (en) * | 2016-06-28 | 2016-10-12 | 中航电测仪器股份有限公司 | Temperature measurement resistor |
| CN106017713B (en) * | 2016-06-28 | 2020-04-24 | 中航电测仪器股份有限公司 | Temperature measuring resistor |
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