CN107064207B - 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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- CN107064207B CN107064207B CN201710028405.XA CN201710028405A CN107064207B CN 107064207 B CN107064207 B CN 107064207B CN 201710028405 A CN201710028405 A CN 201710028405A CN 107064207 B CN107064207 B CN 107064207B
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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 present invention provides heat propagation time constant measuring device and methods between a kind of multiple thermostatic container interlayer, belong to liquid heat propagation time constant fields of measurement.The device includes industrial personal computer, water bath with thermostatic control equipment, pressure controller, image capturing system and suspended matter；The suspended matter is suspended in internal layer liquid；The water bath with thermostatic control equipment is connected by thermo-insulating pipe line with outer layer container, is recycled with outer layer liquid and is realized the control of temperature precision；The pressure controller is connected to by pipeline with the internal layer container, changes pressure suffered by the internal layer liquid in internal layer container by pressure controller；The outside of outer layer container, the observation window of face internal layer container and outer layer container, for acquiring the motion state of suspended matter is arranged in described image acquisition system；The water bath with thermostatic control equipment, pressure controller, image capturing system are connect with industrial personal computer respectively.
Description
Technical field
The invention belongs to liquid heat propagation time constant fields of measurement, and in particular to heat between a kind of multiple thermostatic container interlayer
Propagation time constant measuring apparatus and method.
Background technique
Thermostatic container is widely used in research and production link, is used as and is conducted using liquid medium in most of thermostatic container
And thermostatic medium, it is needed to realize the thermostatic control of mk rank using multiple in many high accuracy temperature control fields
Thermostatic container carries out heat transfer balance using liquid medium connection between every layer of thermostatic container.Temperature control system is generally to outermost layer
Liquid medium temperature be adjusted, conduct the final temperature for realizing liquid environment in internal layer container by multilayer liquid and stablize.
How to determine that the heat propagation time constant between Multideck thermostatic container has important practical significance for High Accuracy Constant Temperature control.
Existing measurement 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 advantages of this method is to establish
In direct measurement data, precision is high, and system is easily achieved.But container is controlled for closed Multideck thermostatic, 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 system, temperature
The heat that the thermal resistance effect of sensor generates can change the thermo parameters method of liquid itself, to influence measurement accuracy.
It is therefore desirable to study a kind of non-connecing that can satisfy liquid heat propagation time constant between closed Multideck thermostatic container
Touch measurement method.
Summary of the invention
It is an object of the invention to solve above-mentioned problem existing in the prior art, a kind of multiple thermostatic container interlayer is provided
Between heat propagation time constant measuring device and method.
The present invention is achieved by the following technical solutions:
Heat propagation time constant measuring device between a kind of 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, opposite two sides is equipped with transparent sight in the outer layer container and internal layer container
Window is examined, the measuring device includes industrial personal computer, water bath with thermostatic control equipment, pressure controller, image capturing system and suspended matter；
The suspended matter is suspended in internal layer liquid；
The water bath with thermostatic control equipment is connected by thermo-insulating pipe line with outer layer container, is recycled with outer layer liquid and is realized temperature essence
Close control；
The pressure controller is connected to by pipeline with the internal layer container, is changed in internal layer container by pressure controller
Internal layer liquid suffered by pressure；
Described image acquisition system is arranged in the outside of outer layer container, the observation window of face internal layer container and outer layer container,
For acquiring the motion state of suspended matter；
The water bath with thermostatic control equipment, pressure controller, image capturing system are connect with industrial personal computer respectively.
The suspended matter is regular geometric body, and the relative difference of 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 connect by RS232 serial ports with industrial personal computer, work
Control machine acquires the motion state, the temperature of regulating thermostatic water bath equipment and adjusting pressure of the collected suspended matter of image capturing system
The output pressure of controller.
The control precision 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 greater than 30fps, and Image Acquisition rectangular area is little
In 4mm × 3mm.
The control precision 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 personal computer is greater than 1KHz.
Milled processed is passed through on the material selection 1Cr18Ni9Ti of the internal layer container, 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 measurement method, comprising:
(1) temperature for passing through industrial personal computer regulating thermostatic water bath equipment, is suspended in suspended matter steadily in internal layer liquid, so
Constant temperature N number of hour afterwards；
(2) it is exported by the pressure that industrial personal computer adjusts pressure controller, pressure excitation δ (t) is generated, under suspended matter is slow
Drop, carries out heat exchange balance between outer layer liquid and internal layer liquid, suspended matter rises back to original position again；It is controlled and is pressed by industrial personal computer
The pressure of force controller exports, and suspended matter is made to rest on a certain spatial altitude position always, and record pressure values change over time
Data and curves P (t), intra-record slack byte time are not more than 0.05 second, and time of measuring is not less than 60 minutes；
(3) first-order mathematic model P (t)=e is used-t/T/ T principle of least square the Fitting Calculation goes out time constant T.
N in the step (1) is 24.
Generation pressure excitation δ (t) in the step (2) is achieved in that
Pressure moment original in internal layer container is increased into 0.3Mpa in 0.1 second, is then reduced to original pressure again, is generated
Pressure motivates δ (t).
It is achieved in that in the step (2) by the pressure output that industrial personal computer controls pressure controller
The industrial personal computer is exported using the pressure of pid algorithm control pressure controller.
Compared with prior art, the beneficial effects of the present invention are: the device of the invention structure is simple, high degree of automation,
It is easily operated, it is suitble to heat propagation time constant between closed Multideck thermostatic container to measure.
Detailed description of the invention
Fig. 1 is the principle of the present invention figure；
Fig. 2 is work flow diagram of the invention.
Specific embodiment
Present invention is further described in detail with reference to the accompanying drawing:
The present invention passes through regulating thermostatic bath temperature and internal layer container pressure change internal layer fluid density, image capturing system
Acquisition suspended matter is in the image information of space motion in real time, and when internal layer fluid density is consistent with aerosol density, suspended matter is just
It is static at a certain height of internal layer liquid；Then the pressure in internal layer container is increased by pressure controller moment and motivates δ (t),
Under Joule Thompson benefit function, internal layer fluid temperature is increased rapidly, so that density becomes smaller, suspended matter slowly declines；Outer layer
Temperature between liquid and internal layer liquid carries out heat exchange balance there are gradient difference, controlled by industrial personal computer with pid algorithm in
Pressure values in layer container, finely tune internal layer fluid density, and suspended matter is made to rest on a certain spatial altitude position always, record pressure
The data and curves P (t) that value changes over time, time of measuring are not less than 60 minutes, use 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 personal computer 1, image capturing system 2, water bath with thermostatic control 3, internal layer liquid 4, hang
Floating object 5 (suspended matter 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 the density of internal layer liquid 4 and suspended matter 5 is close to (two
The relative difference of person, which is less than, is no more than 1 × 10-5), it is water for example, suspended matter 5 uses spherical hollow glass with internal layer liquid 4
Body.(internal layer container is directly placed at the ground of outer layer container in 7 environment of outer layer liquid 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 connect with water bath with thermostatic control 3 by thermo-insulating pipe line and carries out circulation realization
The control of temperature precision.Internal layer container 6 is connected with 9 intermediate duct of pressure controller, can change internal layer by pressure controller 9 and holds
(pressure controller is connected with internal layer container by pipeline pressure suffered by 4 water of internal layer liquid, and pressure controling chamber is to internal layer in device 6
The liquid level of container applies pressure).It can change the temperature in outer layer liquid 7 in water bath with thermostatic control 3, then pass through the mode of heat transfer
Fine adjustment is carried out to 4 water of internal layer liquid, to change the density of 4 water of internal layer liquid.When 4 water density of internal layer liquid changes
When, movement in vertical direction can occur for the 5 spherical hollow vitreum of suspended matter being close with 4 water density of internal layer liquid, move shape
State is acquired 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 connects, and industrial personal computer 1 acquires suspension object image, regulating thermostatic bath temperature and pressure controller output pressure.
Water bath with thermostatic control control precision 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 greater than 30fps, Image Acquisition rectangle region
Domain is not more than 4mm × 3mm；
The control precision 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 greater 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 model P (t)=e-t/T/ T goes out time constant T by principle of least square the Fitting Calculation.
The material selection 1Cr18Ni9Ti of internal layer container of the present invention, surface are passed through milled processed, can effectively be mentioned
The anti-corrosion of high container, antirust ability, while there is good heating conduction.
As shown in Fig. 2, the workflow of the method for the present invention is: needing before test through 1 regulating thermostatic water-bath 3 of industrial personal computer
Temperature, make being suspended in 4 water of internal layer liquid for 5 spherical hollow stabilization of suspended matter, then constant temperature 24 hours.Then pass through
Industrial personal computer 1 adjusts the pressure output of pressure controller 9, and moment increases the pressure 0.3Mpa in internal layer container in 0.1 second, generates
(only using in first time should for pressure excitation δ (t) (increasing 0.3Mpa in original pressure, be then reduced to original pressure again)
Excitation is all the new excitation generated with PID control later), under Joule Thompson benefit function, the temperature of 4 water of internal layer liquid
Degree increases rapidly, so that density becomes smaller, 5 spherical hollow glass of suspended matter slowly declines；Between outer layer liquid 7 and internal layer liquid 4
Temperature carry out heat exchange balance there are gradient difference, by industrial personal computer 1 with pid algorithm control pressure controller 9 pressure it is defeated
Out to change the pressure value of 4 water of internal layer liquid, the density of 4 water of internal layer liquid is finely tuned, makes to hang by the observation of image capturing system 2
Floating object rests on a certain spatial altitude position always, and (always first slightly then decline rises back to original position again to suspended matter, and image is adopted
Collecting system acquires the image of suspended matter, this image information is passed to industrial personal computer, is sentenced by industrial personal computer draw above as software
The motion state of disconnected suspended matter), the data and curves P (t) that record pressure values change 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 method and principle, it is easy to make various types of improvement or deformation, be not limited solely to this
Invent method described in above-mentioned specific embodiment, therefore previously described mode is only preferred, and and do not have limitation
The meaning of property.
Claims (8)
1. heat propagation time constant measurement method between a kind of multiple thermostatic container interlayer, it is characterised in that: what the method used
Measuring device includes internal layer container and outer layer container, and internal layer liquid is filled in internal layer container, outer layer is filled in outer layer container
Liquid, the internal layer container are placed in the outer layer liquid in outer layer container, opposite in the outer layer container and internal layer container
Two sides is equipped with transparent observation window；The measuring device includes that industrial personal computer, water bath with thermostatic control equipment, pressure controller, image are adopted
Collecting system and suspended matter；The suspended matter is suspended in internal layer liquid；The water bath with thermostatic control equipment passes through thermo-insulating pipe line and outer layer
Container is connected, and recycles with outer layer liquid and realizes the control of temperature precision；The pressure controller is held by pipeline and the internal layer
Device connection changes pressure suffered by the internal layer liquid in internal layer container by pressure controller；The setting of described image acquisition system
In the outside of outer layer container, the observation window of face internal layer container and outer layer container, for acquiring the motion state of suspended matter；It is described
Water bath with thermostatic control equipment, pressure controller, image capturing system are connect with industrial personal computer respectively；The described method includes:
(1) temperature for passing through industrial personal computer regulating thermostatic water bath equipment, is suspended in suspended matter steadily in internal layer liquid, then permanent
Temperature N number of hour；
(2) it is exported by the pressure that industrial personal computer adjusts pressure controller, generates pressure excitation δ (t), suspended matter slowly declines, outside
Heat exchange balance is carried out between layer liquid and internal layer liquid, suspended matter rises back to original position again；Pressure control is controlled by industrial personal computer
The pressure of device processed exports, and suspended matter is made to rest on a certain spatial altitude position, the data that record pressure values change over time always
Curve P (t), intra-record slack byte time are not more than 0.05 second, and time of measuring is not less than 60 minutes；
(3) first-order mathematic model P (t)=e is used-t/T/ T principle of least square the Fitting Calculation goes out time constant T.
2. according to the method described in claim 1, it is characterized by: the N in the step (1) is 24.
3. according to the method described in claim 2, it is characterized by: generation pressure excitation δ (t) in the step (2) is this
What sample was realized:
Pressure moment original in internal layer container is increased into 0.3Mpa in 0.1 second, is then reduced to original pressure again, generates pressure
It motivates δ (t).
4. according to the method described in claim 3, it is characterized by: controlling pressure control by industrial personal computer in the step (2)
The pressure output of device is achieved in that
The industrial personal computer is exported using the pressure of pid algorithm control pressure controller.
5. method according to claim 1-4, it is characterised in that: the suspended matter is regular geometric body, close
Degree and the relative difference of the density of internal layer liquid are less than or equal to 1 × 10-5。
6. method according to claim 1-4, it is characterised in that: the water bath with thermostatic control equipment, pressure controller
It is connect by RS232 serial ports with industrial personal computer with image capturing system, industrial personal computer acquires the collected suspended matter of image capturing system
Motion state, the temperature of regulating thermostatic water bath equipment and adjust pressure controller output pressure.
7. method according to claim 1-4, it is characterised in that: the control precision 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 greater than 30fps, and Image Acquisition rectangular area is not more than
4mm×3mm；
The control precision 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 personal computer is greater than 1KHz.
8. method according to claim 1-4, it is characterised in that: the material selection of the internal layer container
Milled processed is passed through on 1Cr18Ni9Ti, surface.
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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)
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| 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 |
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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 |
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| Title |
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| 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;王金涛 等;《物理学报》;20130331;第62卷(第3期);第037702-1至037702-8页 |
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