CN107064207A - Heat propagation time constant measuring device and method between multiple thermostatic container interlayer - Google Patents
Heat propagation time constant measuring device and method between multiple thermostatic container interlayer Download PDFInfo
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- CN107064207A CN107064207A CN201710028405.XA CN201710028405A CN107064207A CN 107064207 A CN107064207 A CN 107064207A CN 201710028405 A CN201710028405 A CN 201710028405A CN 107064207 A CN107064207 A CN 107064207A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/18—Investigating or analyzing materials by the use of thermal means by investigating thermal conductivity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/00584—Control arrangements for automatic analysers
Abstract
The invention provides heat propagation time constant measuring device and method between a kind of multiple thermostatic container interlayer, belong to liquid heat propagation time constant fields of measurement.The device includes industrial computer, water bath with thermostatic control equipment, pressure controller, image capturing system and suspension；The suspension is suspended in internal layer liquid；The water bath with thermostatic control equipment is connected by thermo-insulating pipe line with outer layer container, and temperature precision control is realized with outer layer liquid circulation；The pressure controller is connected by pipeline with the internal layer container, and the pressure suffered by the internal layer liquid in internal layer container is changed by pressure controller；Described image acquisition system is arranged on the outside of outer layer container, just to internal layer container and the observation window of outer layer container, the motion state for gathering suspension；The water bath with thermostatic control equipment, pressure controller, image capturing system are connected with industrial computer respectively.
Description
Technical field
The invention belongs to liquid heat propagation time constant fields of measurement, and in particular to hot between a kind of multiple thermostatic container interlayer
Propagation time constant measuring apparatus and method.
Background technology
Thermostatic container is widely used in being used as conduction using liquid medium in research and production link, most of thermostatic container
And thermostatic medium, in many high accuracy temperature control fields, in order to realize that the thermostatic of mk ranks is controlled, it is necessary to using multiple
Heat transfer balance is carried out using liquid medium connection between thermostatic container, every layer of thermostatic container.Temperature control system is general to outermost layer
Liquid medium temperature be adjusted, conduct the final temperature stabilization for realizing liquid environment in internal layer container by multilayer liquid.
How to determine that the heat propagation time constant between Multideck thermostatic container has important practical significance for High Accuracy Constant Temperature control.
Existing measuring method is mainly the direct method of measurement：The mounting temperature sensor in every layer of liquid, measures every layer of liquid
Temperature changes over time data and curves, calculates every layer of fluid temperature propagation time constant.The advantage of this method is to set up
In direct measurement data, precision is high, and system is easily achieved.But for closed Multideck thermostatic control container, due to internal layer
Liquid can not mounting temperature sensor, therefore this method is difficult to apply；And for mk rank high-precision constant temperature systems, temperature
The heat that the thermal resistance effect of sensor is produced can change the thermo parameters method of liquid in itself, so as to influence measurement accuracy.
It is therefore desirable to study a kind of non-connecing that disclosure satisfy that closed Multideck thermostatic container interstitial fluid body heat propagation time constant
Touch measuring method.
The content of the invention
It is an object of the invention to solve problem present in above-mentioned prior art, there is provided a kind of multiple thermostatic container interlayer
Between heat propagation time constant measuring device and method.
The present invention is achieved by the following technical solutions：
A kind of heat propagation time constant measuring device between multiple thermostatic container interlayer, the multiple thermostatic container includes internal layer
Container and outer layer container, fill internal layer liquid in internal layer container, and outer layer liquid, the internal layer container are filled in outer layer container
It is placed in the outer layer liquid in outer layer container, relative two sides is provided with transparent sight in the outer layer container and internal layer container
Window is examined, the measurement apparatus includes industrial computer, water bath with thermostatic control equipment, pressure controller, image capturing system and suspension；
The suspension is suspended in internal layer liquid；
The water bath with thermostatic control equipment is connected by thermo-insulating pipe line with outer layer container, and temperature essence is realized with outer layer liquid circulation
Close control；
The pressure controller is connected by pipeline with the internal layer container, is changed by pressure controller in internal layer container
Internal layer liquid suffered by pressure；
Described image acquisition system is arranged on the outside of outer layer container, just to internal layer container and the observation window of outer layer container,
Motion state for gathering suspension；
The water bath with thermostatic control equipment, pressure controller, image capturing system are connected with industrial computer respectively.
The suspension is regular geometric body, and the relative difference of its density and the density of internal layer liquid is less than or equal to 1 × 10-5。
The water bath with thermostatic control equipment, pressure controller and image capturing system are connected by RS232 serial ports with industrial computer, work
Motion state, the temperature of regulating thermostatic water bath equipment and the regulation pressure for the suspension that control machine collection image capturing system is collected
The output pressure of controller.
The control accuracy of the water bath with thermostatic control equipment is ± 10mk, adjustable range (10-50) DEG C.
The resolution ratio of described image acquisition system is 10 μm, and sample frequency is more than 30fps, and IMAQ rectangular area is little
In 4mm × 3mm.
The control accuracy of the pressure controller is ± 50Pa, and adjustable range (0.1-1) Mpa, the response time is less than 0.1s.
The sampling rate of the industrial computer is more than 1KHz.
The material selection 1Cr18Ni9Ti of the internal layer container, milled processed is passed through on surface.
Using between above-mentioned multiple thermostatic container interlayer heat propagation time constant measuring device realize multiple thermostatic container every
Interlayer heat propagation time constant measuring method, including：
(1) by the temperature of industrial computer regulating thermostatic water bath equipment, suspension is made stably to be suspended in internal layer liquid, so
Constant temperature N number of hour afterwards；
(2) pressure for adjusting pressure controller by industrial computer is exported, and pressure excitation δ (t) is produced, under suspension is slow
Drop, carries out heat exchange balance between outer layer liquid and internal layer liquid, suspension rises back to original position again；Control to press by industrial computer
The pressure output of force controller, makes suspension rest on a certain spatial altitude position all the time, and record pressure values are changed over time
Data and curves P (t), the intra-record slack byte time is not more than 0.05 second, and time of measuring is not less than 60 minutes；
(3) using first-order mathematic model P (t)=e-t/T/ T principle of least square the Fitting Calculations go out time constant T.
N in the step (1) is 24.
What the generation pressure excitation δ (t) in the step (2) was realized in：
Original pressure moment in internal layer container is increased into 0.3Mpa in 0.1 second, then original pressure is reduced to again, produced
Pressure excitation δ (t).
It is realized in the step (2) by the pressure output of industrial computer control pressure controller：
The industrial computer is exported using the pressure of pid algorithm control pressure controller.
Compared with prior art, the beneficial effects of the invention are as follows：Apparatus structure of the invention is simple, automaticity is high,
Easily operated, heat propagation time constant is measured between being adapted to closed Multideck thermostatic container.
Brief description of the drawings
Fig. 1 is the schematic diagram of the present invention；
Fig. 2 is the workflow diagram of the present invention.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings：
The present invention passes through regulating thermostatic bath temperature and internal layer container pressure change internal layer fluid density, image capturing system
Collection suspension is in the image information of space motion in real time, and when internal layer fluid density is consistent with aerosol density, suspension is just
It is static at a certain height of internal layer liquid；Then the pressure increased by pressure controller moment in internal layer container encourages δ (t),
Under Joule Thompson benefit function, internal layer fluid temperature is raised rapidly, so that density diminishes, suspension slowly declines；Outer layer
Be present gradient difference and carry out heat exchange balance in the temperature between liquid and internal layer liquid, controlled by industrial computer with pid algorithm interior
Pressure values in layer container, finely tune internal layer fluid density, suspension is rested on a certain spatial altitude position all the time, record pressure
The data and curves P (t) that value is changed over time, time of measuring is not less than 60 minutes, uses first-order mathematic model P (t)=e-t/T/T
The Fitting Calculation goes out time constant T.
As shown in figure 1, apparatus of the present invention include industrial computer 1, it is image capturing system 2, water bath with thermostatic control 3, internal layer liquid 4, outstanding
Float 5 (suspension is generally regular geometric body, such as spherical and square), internal layer container 6, outer layer liquid 7, outer layer container 8
With pressure controller 9.There is internal layer liquid 4 in internal layer container 6, the density of internal layer liquid 4 and the density of suspension 5 are close to (two
The relative difference of person, which is less than, is no more than 1 × 10-5), with internal layer liquid 4 for water for example, suspension 5 uses spherical hollow glass
Body.(internal layer container is directly placed at the ground of outer layer container in the environment of outer layer liquid 7 that internal layer container 6 is placed in outer layer container 8
On plate, or it is placed on the cushion block on floor), outer layer liquid 7 is connected progress circulation realization with water bath with thermostatic control 3 by thermo-insulating pipe line
Temperature precision control.Internal layer container 6 is connected with the intermediate duct of pressure controller 9, and can change internal layer by pressure controller 9 holds
(pressure controller and internal layer container are connected pressure in device 6 suffered by the water of internal layer liquid 4 by pipeline, and pressure controling chamber is to internal layer
The liquid level of container applies pressure).The temperature in outer layer liquid 7 can be changed in water bath with thermostatic control 3, then by the mode of heat transfer
Fine adjustment is carried out to the water of internal layer liquid 4, so as to change the density of the water of internal layer liquid 4.When the water density of internal layer liquid 4 changes
When, movement in vertical direction can occur for the spherical hollow vitreum of suspension 5 being close with the water density of internal layer liquid 4, and it moves shape
State is gathered by image capturing system 2.Image capturing system 2, water bath with thermostatic control 3 and pressure controller 9 pass through RS232 serial ports and industry control
Machine 1 is connected, the collection suspension of industrial computer 1 object image, regulating thermostatic bath temperature and pressure controller output pressure.
Water bath with thermostatic control control accuracy of the present invention is ± 10mk, adjustable range (10-50) DEG C；
Image capturing system resolution ratio of the present invention is 10 μm, and sample frequency is more than 30fps, IMAQ rectangle region
Domain is not more than 4mm × 3mm；
The control accuracy of pressure controller of the present invention is ± 50Pa, adjustable range (0.1-1) Mpa, response time
Less than 0.1s；
Industrial computer data acquisition system sampling rate of the present invention is more than 1KHz；
Pressure values of the present invention changed over time data and curves P (t) time of measuring not less than 60 minutes, used single order
Mathematical modeling P (t)=e-t/T/ T goes out time constant T by principle of least square the Fitting Calculation.
Milled processed is passed through on the material selection 1Cr18Ni9Ti of internal layer container of the present invention, surface, can effectively be carried
The anti-corrosion of high container, antirust ability, while having good heat conductivility.
As shown in Fig. 2 the workflow of the inventive method is：Needed before test by the regulating thermostatic water-bath 3 of industrial computer 1
Temperature, make being suspended in the water of internal layer liquid 4 for the spherical hollow stabilization of suspension 5, then constant temperature 24 hours.Then pass through
The pressure output of the regulation pressure controller 9 of industrial computer 1, moment increases the pressure 0.3Mpa in internal layer container in 0.1 second, produces
(only being used in first time should by pressure excitation δ (t) (increasing 0.3Mpa on original pressure, be then reduced to original pressure again)
Excitation, is all the new excitation produced with PID control later), under Joule Thompson benefit function, the temperature of the water of internal layer liquid 4
The rapid rise of degree, so that density diminishes, the spherical hollow glass of suspension 5 slowly declines；Between outer layer liquid 7 and internal layer liquid 4
Temperature there is gradient difference and carry out heat exchange balance, it is defeated with the pressure of pid algorithm control pressure controller 9 by industrial computer 1
Go out so as to change the pressure value of the water of internal layer liquid 4, the density of the water of fine setting internal layer liquid 4 makes to hang by the observation of image capturing system 2
Float rests on a certain spatial altitude position all the time, and (suspension always first slightly declines and then rises back to original position again, and image is adopted
Collecting system gathers the image of suspension, and this image information is passed into industrial computer, sentenced by industrial computer draw above as software
The motion state of disconnected suspension), the data and curves P (t) that record pressure values are changed over time, time of measuring is not less than 60 minutes,
Use first-order mathematic model P (t)=e-t/T/ T (t is the time in pressure time graph, and T is the time constant of first-order system) is used
Principle of least square the Fitting Calculation goes out time constant T.
Above-mentioned technical proposal is one embodiment of the present invention, for those skilled in the art, at this
On the basis of disclosure of the invention application process and principle, it is easy to make various types of improvement or deformation, this is not limited solely to
Invent the method described by above-mentioned embodiment, therefore previously described mode is preferred, and and without limitation
The meaning of property.
Claims (9)
1. a kind of heat propagation time constant measuring device between multiple thermostatic container interlayer, the multiple thermostatic container holds including internal layer
Device and outer layer container, fill internal layer liquid in internal layer container, and outer layer liquid is filled in outer layer container, and the internal layer container is put
Put in the outer layer liquid in outer layer container, relative two sides is provided with transparent observation in the outer layer container and internal layer container
Window, it is characterised in that：The measurement apparatus includes industrial computer, water bath with thermostatic control equipment, pressure controller, image capturing system and hanged
Float；
The suspension is suspended in internal layer liquid；
The water bath with thermostatic control equipment is connected by thermo-insulating pipe line with outer layer container, and temperature precision control is realized with outer layer liquid circulation
System；
The pressure controller is connected by pipeline with the internal layer container, is changed by pressure controller in internal layer container
Pressure suffered by layer liquid；
Described image acquisition system is arranged on the outside of outer layer container, just to internal layer container and the observation window of outer layer container, is used for
Gather the motion state of suspension；
The water bath with thermostatic control equipment, pressure controller, image capturing system are connected with industrial computer respectively.
2. heat propagation time constant measuring device between multiple thermostatic container interlayer according to claim 1, it is characterised in that：
The suspension is regular geometric body, and the relative difference of its density and the density of internal layer liquid is less than or equal to 1 × 10-5。
3. heat propagation time constant measuring device between multiple thermostatic container interlayer according to claim 2, it is characterised in that：
The water bath with thermostatic control equipment, pressure controller and image capturing system are connected by RS232 serial ports with industrial computer, industrial computer collection
The motion state of the suspension that image capturing system is collected, the temperature of regulating thermostatic water bath equipment and regulation pressure controller
Output pressure.
4. heat propagation time constant measuring device between multiple thermostatic container interlayer according to claim 1, it is characterised in that：
The control accuracy of the water bath with thermostatic control equipment is ± 10mk, adjustable range (10-50) DEG C；
The resolution ratio of described image acquisition system is 10 μm, and sample frequency is more than 30fps, and IMAQ rectangular area is not more than
4mm×3mm；
The control accuracy of the pressure controller is ± 50Pa, and adjustable range (0.1-1) Mpa, the response time is less than 0.1s；
The sampling rate of the industrial computer is more than 1KHz.
5. heat propagation time constant measuring device between multiple thermostatic container interlayer according to claim 4, it is characterised in that：
The material selection 1Cr18Ni9Ti of the internal layer container, milled processed is passed through on surface.
6. realized using heat propagation time constant measuring device between any described multiple thermostatic container interlayers of claim 1-5
Measuring method, it is characterised in that：Methods described includes：
(1) by the temperature of industrial computer regulating thermostatic water bath equipment, suspension is made stably to be suspended in internal layer liquid, Ran Houheng
Temperature N number of hour；
(2) pressure for adjusting pressure controller by industrial computer is exported, and produces pressure excitation δ (t), and suspension slowly declines, outside
Heat exchange balance is carried out between layer liquid and internal layer liquid, suspension rises back to original position again；Pass through industrial computer control pressure control
The pressure output of device processed, makes suspension rest on a certain spatial altitude position, the data that record pressure values are changed over time all the time
Curve P (t), the intra-record slack byte time is not more than 0.05 second, and time of measuring is not less than 60 minutes；
(3) using first-order mathematic model P (t)=e-t/T/ T principle of least square the Fitting Calculations go out time constant T.
7. method according to claim 6, it is characterised in that：N in the step (1) is 24.
8. method according to claim 7, it is characterised in that：Generation pressure excitation δ (t) in the step (2) is this
What sample was realized：
Original pressure moment in internal layer container is increased into 0.3Mpa in 0.1 second, original pressure is then reduced to again, pressure is produced
Encourage δ (t).
9. heat propagation time constant measuring device between multiple thermostatic container interlayer according to claim 8, it is characterised in that：
It is realized in the step (2) by the pressure output of industrial computer control pressure controller：
The industrial computer is exported using the pressure of pid algorithm control pressure controller.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710028405.XA CN107064207B (en) | 2017-01-16 | 2017-01-16 | Heat propagation time constant measuring device and method between multiple thermostatic container interlayer |
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| CN201710028405.XA CN107064207B (en) | 2017-01-16 | 2017-01-16 | Heat propagation time constant measuring device and method between multiple thermostatic container interlayer |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940969A (en) * | 2014-05-06 | 2014-07-23 | 中国计量科学研究院 | System and method for measuring compressibility coefficient of organic liquid based on standard monocrystal silicon sphere |
| CN105699592A (en) * | 2015-10-16 | 2016-06-22 | 中国计量科学研究院 | System and method for measuring compressibility coefficient ratio of liquid under constant entropy and constant temperature condition |
-
2017
- 2017-01-16 CN CN201710028405.XA patent/CN107064207B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103940969A (en) * | 2014-05-06 | 2014-07-23 | 中国计量科学研究院 | System and method for measuring compressibility coefficient of organic liquid based on standard monocrystal silicon sphere |
| CN105699592A (en) * | 2015-10-16 | 2016-06-22 | 中国计量科学研究院 | System and method for measuring compressibility coefficient ratio of liquid under constant entropy and constant temperature condition |
Non-Patent Citations (2)
| Title |
|---|
| 王金涛 等: "基于静力悬浮原理的单晶硅球间微量密度差异精密测量方法研究", 《物理学报》 * |
| 王金涛 等: "近单晶硅密度液体压缩系数精密测量方法", 《仪器仪表学报》 * |
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