CN105511518B - A kind of intelligent temperature control method for liquid nitrogen cryogenics device - Google Patents
A kind of intelligent temperature control method for liquid nitrogen cryogenics device Download PDFInfo
- Publication number
- CN105511518B CN105511518B CN201510930093.2A CN201510930093A CN105511518B CN 105511518 B CN105511518 B CN 105511518B CN 201510930093 A CN201510930093 A CN 201510930093A CN 105511518 B CN105511518 B CN 105511518B
- Authority
- CN
- China
- Prior art keywords
- temperature
- liquid nitrogen
- flow
- nitrogen
- control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
Abstract
The present invention relates to a kind of intelligent temperature control method for liquid nitrogen cryogenics device, the control mode being combined with gas flow adjustment using two-stage series connection temperature adjustment, it is first the low temperature nitrogen of lower temperature by liquid nitrogen gasification, the flow of low temperature nitrogen is controlled again, finally by the temperature of regulation low temperature nitrogen, design temperature is reached to be exported by nozzle, wherein：Liquid nitrogen gasification, by liquid nitrogen gasification in liquid nitrogen converter, produces the low temperature nitrogen less than setting output temperature；Flow-rate adjustment, flow adjustment is carried out by the low temperature nitrogen after gasification by gas flow control module, reaches predetermined amount of flow；Output temperature is adjusted, and the low temperature nitrogen of stability of flow carries out last temperature adjustment in output temperature adjustment module, reaches predetermined temperature.The present invention have developed the fuzzy temperature control system with good human-computer interaction interface, and accurately He stably can realize real-time control to low temperature nitrogen temperature.
Description
Technical field
The present invention relates to a kind of temperature control technology, specifically a kind of intelligent temperature control for liquid nitrogen cryogenics device
Method processed.
Background technology
X-ray single crystal diffractometer can be analyzed to the structure of matter and composition, in the case where sample is not destroyed, Neng Gouzhun
Really determine the mono-crystalline structures of molecule.Single crystal diffraction technology can determine the spatial arrangement of crystals atom (molecule, ion)
And structural symmetry, interatomic bond distance, bond angle, distribution of charges are determined, inquire into the microstructure of material and the pass of macro property
System.
The complete image data of most of single crystal samples is collected during simple sample is enclosed in cryogenic gas stream.Generally receive
Temperature during collection view data is completed in the range of 100K-200K.For large biological molecule, can be with by reducing its temperature
The radiation that X-ray is significantly reduced in crystals is spread, so as to reduce the damage to crystal prototype.
Liquid nitrogen cryogenics device is applied in X-ray single crystal diffractometer, is to the imagination that sample implements sub-cooled
Feasible.Liquid nitrogen is the liquid form that nitrogen is formed at low temperature.The boiling point of nitrogen is -196 DEG C, and temperature is such as at normal atmospheric pressure
Fruit will form liquid nitrogen below this.Liquid nitrogen is widely used in industrial production, when using liquid nitrogen, because it is in
Liquid, it is impossible to directly use, forms low temperature nitrogen and recycles after can only gasifying；Due to after liquid nitrogen gasification volume be liquid when
More than 600 times, the rapid change of volume, the stability of flow precision of influence output nitrogen, and then influence the temperature control of output nitrogen
Precision.
At present, it is applied to be reduced to the damage of crystal prototype by reducing temperature in X-ray single crystal diffractometer
There is not been reported for liquid nitrogen cryogenics temperature control method.
The content of the invention
For the stability of flow precision for exporting nitrogen due to the rapid change influence of volume after liquid nitrogen gasification in the prior art,
And then influenceing the temperature control precision of output nitrogen, this is not enough, the technical problem to be solved in the present invention is to provide one kind can be accurate
Really, stabilization realizes the intelligent temperature control method for liquid nitrogen cryogenics device to low temperature nitrogen temperature real-time control.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of intelligent temperature control method for liquid nitrogen cryogenics device of the invention, using two-stage series connection temperature adjustment and gas
The control mode that the adjustment of body flow is combined, is first the low temperature nitrogen of lower temperature by liquid nitrogen gasification, then control low temperature nitrogen
Flow, finally by the temperature of regulation low temperature nitrogen, reaches design temperature and is exported by nozzle, wherein：
Liquid nitrogen gasification, by liquid nitrogen gasification in liquid nitrogen converter, produces the low temperature nitrogen less than setting output temperature；
Flow-rate adjustment, flow adjustment is carried out by the low temperature nitrogen after gasification by gas flow control module, is reached
Predetermined amount of flow；
Output temperature is adjusted, and the low temperature nitrogen of stability of flow carries out last temperature in output temperature adjustment module and adjusts
It is whole, reach predetermined temperature.
The liquid nitrogen gasification includes control gasification heating power, i.e., liquid nitrogen gasification PID control meter is carried out in main control module
Calculate, carry out the correction-compensation of power output to the influence factor for controlling temperature for flow in PID computational algorithms, output is believed
Number by control output circuit module loading on liquid nitrogen converter, temperature control is carried out to liquid nitrogen gasification.
Liquid nitrogen gasification PID computational algorithms are：
P=AF2+B·F+C·t+D (1)
Wherein, P is heating power, and F is flow, and t is temperature, and A, B, C, D are equation coefficients, in actual motion survey calculation
Afterwards, fitting is obtained.
The output temperature regulation is that temperature adjustment PID control calculating is carried out in main control module, in PID computational algorithms
The correction-compensation of power output is carried out to the influence factor for controlling temperature for flow, by output signal by controlled output electricity
Road module loading carries out temperature control on liquid nitrogen converter to liquid nitrogen gasification.
Output temperature adjusts PID computational algorithms：
P=AF+B (2)
Wherein, P is heating power, and F is flow, and A, B are equation coefficients, and after actual motion survey calculation, fitting is obtained.
The invention has the advantages that and advantage：
1. programming, debugging of the present invention by software, can accurately and stably realize control in real time to low temperature nitrogen temperature
System, the control mode being combined with gas flow adjustment using two-stage series connection temperature adjustment, first order liquid nitrogen gasification and the second level
Output temperature regulation is respectively adopted Fuzzy PID, and power output is carried out to the influence factor for controlling temperature for flow
Correction-compensation, control temperature accuracy is reached design requirement, and it is accurate to export response quickly.
2. the inventive method has reliability high, and energy consumption is low, and the design of system, construction work amount are small, easy to maintenance, exploitation
The advantages of efficiency high, control gas flow has response quickly, the advantage of precise control, the final essence for ensureing to realize control temperature
Degree.
Brief description of the drawings
The theory diagram of the intelligent temperature control system for liquid nitrogen cryogenics device that Fig. 1 is related to for the inventive method；
Fig. 2 is temperature control workflow of the present invention.
Specific embodiment
With reference to Figure of description, the present invention is further elaborated.
As shown in figure 1, a kind of intelligent temperature control method for liquid nitrogen cryogenics device of the invention passes through following hardware system
System realization, including：Main control module, temperature sensor, resistance thermometry, control output circuit module, touch-screen, liquid nitrogen gasification
Device, output temperature adjustment module and gas flow control module, wherein：Resistance thermometry, receives the temperature of temperature sensor
Signal, and temperature signal is converted into electric signal is transferred to main control module；Main control module, receives and treatment resistance thermometry sends
Data, output information to control output circuit module；Control output circuit module, control liquid nitrogen converter and output temperature are adjusted
The power output of heater strip in section module, so as to control temperature；Gas flow control module receives the instruction control of main control module
Gas flow；Touch-screen, data cube computation is carried out with main control module, and temperature and gas at liquid nitrogen converter and nozzle are shown in real time
Flow value.
In the present embodiment, control output circuit module is made up of photoelectric isolating device and MOSFET element, for controlling liquid
The power output of heater strip in nitrogen vaporizer and output temperature adjustment module, so as to control temperature；Main control module is public Siemens
The CPU224XP CN taken charge of in programmable controller (PLC) S7-200 series produced；Resistance thermometry uses Siemens
The EM231CN expansion modules that company produces.
Gas flow control module is made up of gas mass flow controller and vacuum diaphragm pump, positioned at liquid nitrogen converter and
Between output temperature adjustment module, for the nitrogen flow for controlling whole system to export.
Main control module is also circumscribed with touch-screen, and the touch-screen is used to be input into associated temperature variable parameter, and shows institute in real time
State the temperature value and the flow value of gas flow control module of liquid nitrogen converter and output temperature adjustment module.
As shown in Fig. 2 a kind of intelligent temperature control method for liquid nitrogen cryogenics device of the invention, using two-stage series connection temperature
The control mode that degree regulation is combined with gas flow adjustment, is first the low temperature nitrogen of lower temperature by liquid nitrogen gasification, then control
The flow of low temperature nitrogen, finally by the temperature of regulation low temperature nitrogen, reaches design temperature and is exported by nozzle, wherein：
Liquid nitrogen gasification, by liquid nitrogen gasification in liquid nitrogen converter, produces the low temperature nitrogen less than setting output temperature；
Flow-rate adjustment, flow adjustment is carried out by the low temperature nitrogen after gasification by gas flow control module, is reached
Predetermined amount of flow；
Output temperature is adjusted, and the low temperature nitrogen of stability of flow carries out last temperature in output temperature adjustment module and adjusts
It is whole, reach predetermined temperature.
By liquid nitrogen gasification first in liquid nitrogen converter, period needs control gasification heating power, it is therefore an objective to which generation is less than
Set the low temperature nitrogen of output temperature.Because the temperature control precision of whole system is also related to gas flow, in this one-level
Need to consider flow on temperature controlled influence in temperature controlled processes.The system controls liquid nitrogen gasification process using pid algorithm,
Flow parameter is added in pid control algorithm, make PID control export heating signal remove with design temperature mutually outside the Pass also with stream
Amount is related.Liquid nitrogen gasification PID control calculating is carried out in main control module, for flow to control temperature in PID computational algorithms
Influence factor carried out the correction-compensation of power output, by output signal by control output circuit module loading to liquid nitrogen gas
Change on device, temperature control is carried out to liquid nitrogen gasification, computational methods are shown in formula (1), reach expected purpose.
P=AF2+B·F+C·t+D (1)
Wherein, P is heating power, and F is flow；T is temperature, and A, B, C, D are equation coefficients, related to particular system.
In quadratic polynomial expressed by formula (1), A, B, C, D numerical value are related to particular system, are measured through actual motion, by data
Collection, obtains power output and flow, multigroup corresponding data of temperature, by being obtained after the Fitting Calculation.Measure in the present system
Respectively 5.3571, -10.643,1.6035,340.
Secondly, the low temperature nitrogen through gasifying is by the vacuum diaphragm pump and gaseous mass in gas flow control module 109
Flow controller carries out flow adjustment, reaches predetermined amount of flow.
Finally, the low temperature nitrogen of stability of flow carries out last temperature adjustment in output temperature adjustment module, reaches it
To predetermined temperature, exported to sample from the nozzle of liquid nitrogen cryogenics device.It is directed in the temperature PID computational algorithm of this part
Flow carries out the correction-compensation of power output to the influence factor for controlling temperature, and temperature control, calculating side are carried out to output nitrogen
Method is shown in formula (2).
P=AF+B (2)
Wherein, P is heating power, and F is flow, and A, B are equation coefficients.In the linear formula expressed by formula (2), it is
Number A, B numerical value is related to particular system, is measured through actual motion, by data acquisition, obtains power output multigroup with flow
Corresponding data, by being obtained after the Fitting Calculation.Respectively 4,146 are measured in the present system.
In sum, a kind of intelligent temperature control system for liquid nitrogen cryogenics device of the invention, by the electricity of hardware
Road design, drafting and the programming of software, debugging, have developed the fuzzy temperature control system with good human-computer interaction interface
System, and real-time control accurately He stably can be realized to low temperature nitrogen temperature.So, the present invention effectively overcomes existing skill
Various shortcoming in art and have high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
The personage for knowing this technology all can carry out modifications and changes under without prejudice to spirit and scope of the invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete with institute under technological thought without departing from disclosed spirit such as
Into all equivalent modifications or change, should be covered by claim of the invention.
Claims (4)
1. a kind of intelligent temperature control method for liquid nitrogen cryogenics device, it is characterised in that：Using two-stage series connection temperature adjustment
It is first the low temperature nitrogen of lower temperature by liquid nitrogen gasification, then control cryogenic nitrogen with the control mode that gas flow adjustment is combined
The flow of gas, finally by the temperature of regulation low temperature nitrogen, reaches setting output temperature and is exported by nozzle, wherein：
Liquid nitrogen gasification, by liquid nitrogen gasification in liquid nitrogen converter, produces the low temperature nitrogen less than setting output temperature；
Flow-rate adjustment, flow adjustment is carried out by the low temperature nitrogen after gasification by gas flow control module, is reached predetermined
Flow；
Output temperature is adjusted, and the low temperature nitrogen of stability of flow carries out last temperature adjustment in output temperature adjustment module, makes
It reaches setting output temperature；
The liquid nitrogen gasification includes control gasification heating power, i.e., liquid nitrogen gasification PID control calculating is carried out in main control module,
Carry out the correction-compensation of power output in PID computational algorithms to the influence factor for controlling temperature for flow, output signal is led to
Control output circuit module loading is crossed to liquid nitrogen converter, temperature control is carried out to liquid nitrogen gasification.
2. the intelligent temperature control method for liquid nitrogen cryogenics device as described in claim 1, it is characterised in that liquid nitrogen gasification
PID computational algorithms are：
P=AF2+B·F+C·t+D (1)
Wherein, P is heating power, and F is flow, and t is temperature, and A, B, C, D are equation coefficients, after actual motion survey calculation,
Fitting is obtained.
3. the intelligent temperature control method for liquid nitrogen cryogenics device as described in claim 1, it is characterised in that：The output
Temperature adjustment is that temperature adjustment PID control calculating is carried out in main control module, for flow to control temperature in PID computational algorithms
The influence factor of degree has carried out the correction-compensation of power output, by output signal by control output circuit module loading to output
On temperature adjustment module, temperature control is carried out to liquid nitrogen gasification.
4. the intelligent temperature control method for liquid nitrogen cryogenics device as described in claim 3, it is characterised in that：Output temperature
Adjusting PID computational algorithms is：
P=AF+B (2)
Wherein, P is heating power, and F is flow, and A, B are equation coefficients, and after actual motion survey calculation, fitting is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510930093.2A CN105511518B (en) | 2015-12-14 | 2015-12-14 | A kind of intelligent temperature control method for liquid nitrogen cryogenics device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510930093.2A CN105511518B (en) | 2015-12-14 | 2015-12-14 | A kind of intelligent temperature control method for liquid nitrogen cryogenics device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105511518A CN105511518A (en) | 2016-04-20 |
| CN105511518B true CN105511518B (en) | 2017-05-31 |
Family
ID=55719578
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510930093.2A Active CN105511518B (en) | 2015-12-14 | 2015-12-14 | A kind of intelligent temperature control method for liquid nitrogen cryogenics device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105511518B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289548A (en) * | 2016-07-28 | 2017-01-04 | 广州赛莱拉干细胞科技股份有限公司 | Portable liquid nitrogen temperature monitoring device and early warning system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008133983A (en) * | 2006-11-28 | 2008-06-12 | Cool Technos:Kk | Ultra low temperature gas generator |
| CN203141310U (en) * | 2013-02-27 | 2013-08-21 | 安徽万瑞冷电科技有限公司 | Low-temperature nitrogen supplying system for use in low-temperature processing |
| WO2014083810A1 (en) * | 2012-11-27 | 2014-06-05 | 日曹エンジニアリング株式会社 | Refrigerant cooling device and method |
| CN203869557U (en) * | 2014-05-16 | 2014-10-08 | 丹东通达科技有限公司 | Liquid-nitrogen evaporator for X-ray single-crystal diffractometer |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9062904B2 (en) * | 2012-10-23 | 2015-06-23 | Doty Scientific, Inc. | Stabilizing control of a saturated cold gas stream |
-
2015
- 2015-12-14 CN CN201510930093.2A patent/CN105511518B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008133983A (en) * | 2006-11-28 | 2008-06-12 | Cool Technos:Kk | Ultra low temperature gas generator |
| WO2014083810A1 (en) * | 2012-11-27 | 2014-06-05 | 日曹エンジニアリング株式会社 | Refrigerant cooling device and method |
| CN203141310U (en) * | 2013-02-27 | 2013-08-21 | 安徽万瑞冷电科技有限公司 | Low-temperature nitrogen supplying system for use in low-temperature processing |
| CN203869557U (en) * | 2014-05-16 | 2014-10-08 | 丹东通达科技有限公司 | Liquid-nitrogen evaporator for X-ray single-crystal diffractometer |
Non-Patent Citations (2)
| Title |
|---|
| 低温加工用低温氮气系统研制;张海峰 等;《低温与超导》;20121031;第40卷(第10期);第34-36页 * |
| 喷射式气氮调温系统;韩启文 等;《中国空间科学技术》;20020630(第3期);第65-68页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105511518A (en) | 2016-04-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105630033B (en) | Temperature control method of water and its control system based on Adaptive Fuzzy PID | |
| CN104508575B (en) | PID constant operation method in use in semiconductor manufacturing apparatus temperature adjustment device, semiconductor manufacturing and the method for operation of use in semiconductor manufacturing apparatus temperature adjustment device | |
| CN105094177A (en) | High-precision constant-temperature controller and method based on fuzzy self-adaptive PID control | |
| CN103488216A (en) | Temperature control method of solar cell panel | |
| CN106647873A (en) | Temperature control method of wave-absorbing external heat flow simulation system for large-scale spacecraft antenna performance test | |
| CN103365212A (en) | Greenhouse control method based on CFD numerical simulation | |
| CN106768812B (en) | Flow parameter adjusting method and device based on wind-tunnel | |
| CN105353811B (en) | A kind of intelligent temperature control system and its control method for liquid nitrogen cryogenics device | |
| CN105511518B (en) | A kind of intelligent temperature control method for liquid nitrogen cryogenics device | |
| CN201476905U (en) | Neural network PID temperature controlled thermocouple automatic verification system | |
| CN102455718A (en) | Temperature control system in catalyst production device, temperature control method and application of temperature control system | |
| CN104503509A (en) | Induction furnace water temperature constant automatic control system and method | |
| CN205210740U (en) | A intelligent temperature control system for liquid nitrogen low temperature device | |
| Rathore et al. | PLC based PID implementation in process control of temperature flow and level | |
| CN105652692A (en) | Semi-physical object simulating platform of power plant instrument control system based on thermal power generation and control method | |
| CN206075835U (en) | The system that core heat release is simulated in a kind of electrical heating | |
| CN103063080A (en) | Temperature control method of cinder-flushing water of cooling tower outlet of blast furnace slag processing system | |
| CN107121927B (en) | Irrigation system based on generalized predictive control | |
| CN202865113U (en) | Crucible spraying control system based on robot CNC | |
| CN102645315B (en) | Automatic, fast and accurate detection method for air resistance characteristics of large heat exchanger | |
| CN204965229U (en) | Wet controlling means of constant temperature in digit control machine tool | |
| CN108375310B (en) | A kind of vacuum furnace beacon flint control method | |
| Jiaocheng et al. | The temperature field measurement of billet based on multi-information fusion | |
| CN206321052U (en) | A kind of temperature control baking box | |
| CN211348130U (en) | Combined gas distribution equipment for automatic calibration of gas sensor |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |