CN105353811B - A kind of intelligent temperature control system and its control method for liquid nitrogen cryogenics device - Google Patents
A kind of intelligent temperature control system and its control method for liquid nitrogen cryogenics device Download PDFInfo
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- CN105353811B CN105353811B CN201510933264.7A CN201510933264A CN105353811B CN 105353811 B CN105353811 B CN 105353811B CN 201510933264 A CN201510933264 A CN 201510933264A CN 105353811 B CN105353811 B CN 105353811B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
Abstract
The present invention relates to a kind of intelligent temperature control system and its control method for liquid nitrogen cryogenics device, device includes：Main control module, temperature sensor, resistance thermometry, control output circuit module, touch-screen, liquid nitrogen converter, output temperature adjustment module and gas flow control module；The control mode that method is combined using two-stage series connection temperature adjustment with gas flow 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, is reached design temperature and is exported by nozzle.Programming, debugging of the present invention by software, 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 system, specifically a kind of intelligent temperature control for liquid nitrogen cryogenics device
System processed and its control method.
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 system.
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 system for liquid nitrogen cryogenics device and its control to low temperature nitrogen temperature real-time control
Method.
In order to solve the above technical problems, the technical solution adopted by the present invention is：
The present invention relates to a kind of intelligent temperature control system for liquid nitrogen cryogenics device, including：Main control module, temperature are passed
Sensor, resistance thermometry, control output circuit module, touch-screen, liquid nitrogen converter, output temperature adjustment module and gas stream
Amount control module, wherein：
Resistance thermometry, receive temperature sensor temperature signal, and by temperature signal be converted into electric signal be transferred to master
Control module；
Main control module, receives and processes the data that resistance thermometry sends, output information to control output circuit module；
Control output circuit module, the power output of heater strip in control liquid nitrogen converter and output temperature adjustment module,
So as to control temperature；
Gas flow control module receives the instruction control gas flow of main control module；
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.
The gas flow control module includes gas mass flow controller and vacuum diaphragm pump, positioned at liquid nitrogen converter
And output temperature adjustment module between.
CPU224XP CN of the main control module using the programmable controller S7-200 that Siemens Company produces in serial.
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；
F is flow；
T is temperature；
A, B, C, D are equation coefficients.
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；F is flow；A, B are equation coefficients.
The invention has the advantages that and advantage：
1. programming, debugging of the present invention by software, the liquid nitrogen cryogenics device of exploitation can be accurately and stably to low temperature
Nitrogen temperature realizes real-time control, the control mode being combined with gas flow adjustment using two-stage series connection temperature adjustment, first
Level liquid nitrogen gasification and the second level output temperature regulation Fuzzy PID is respectively adopted, for flow to control temperature shadow
The factor of sound carries out the correction-compensation of power output, control temperature accuracy is reached design requirement, and it is accurate to export response quickly；
2. present system uses programmable controller as control core, strong antijamming capability high with reliability,
Small in volume, energy consumption is low, and the design of system, construction work amount are small, easy to maintenance, the advantages of development efficiency is high；
3. the control output circuit module in the present invention is made up of photoelectric isolating device and MOSFET element, and output is anti-dry
Disturb, response quickly it is accurate；
4. the gas flow control module in the present invention uses gas mass flow controller and vacuum diaphragm pump, controls gas
Body flow has response quickly, the advantage of precise control, the final precision for ensureing to realize control temperature；Vacuum diaphragm pump can be 24 small
When continuously run, without any working media (oil-free), pollution is not produced, it is ensured that gas it is pure；
5. present system employs touch-screen and carries out the input and display in real time of data, with good man-machine interaction circle
Face.
Brief description of the drawings
Fig. 1 is structured flowchart of the present invention for the intelligent temperature control system of liquid nitrogen cryogenics device.
Fig. 2 is the temperature control workflow of liquid nitrogen cryogenics device in 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 system for liquid nitrogen cryogenics device of the invention includes：Main control module,
Temperature sensor, resistance thermometry, control output circuit module, touch-screen, liquid nitrogen converter, output temperature adjustment module and
Gas flow control module, wherein：Resistance thermometry, receives the temperature signal of temperature sensor, and temperature signal is converted into
Electric signal is transferred to main control module；Main control module, receives and processes the data that resistance thermometry sends, and output information is defeated to controlling
Go out circuit module；Control output circuit module, the output work of heater strip in control liquid nitrogen converter and output temperature adjustment module
Rate, so as to control temperature；Gas flow control module receives the instruction control gas flow of main control module；Touch-screen, with master control
Module carries out data cube computation, and temperature and gas flow values at liquid nitrogen converter and nozzle are shown in real time.
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.Through actual test, power output meets quadratic polynomial function with flow, with
Temperature line relationship, 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, and t is temperature, and A, B, C, D are equation coefficients.
In the quadratic polynomial expressed by formula (1), A, B, C, D numerical value are related to particular system, are surveyed through actual motion
Amount, by data acquisition, obtains power output and flow, multigroup corresponding data of temperature, by being obtained after the Fitting Calculation.At this
Respectively 5.3571, -10.643,1.6035,340 are measured in system.
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 is carried out through actual survey to output nitrogen
Examination, power output meets linear relationship with flow, and computational methods are shown in formula (2).
P=AF+B (2)
Wherein, P is heating power；F is flow；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；
F is flow；
T is temperature；
A, B, C, D are equation coefficients.
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；F is flow；A, B are equation coefficients.
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| CN109655731A (en) * | 2017-10-12 | 2019-04-19 | 北京信息科技大学 | A kind of demisler when the low-temperature test for wafer |
| CN108732193A (en) * | 2018-05-31 | 2018-11-02 | 西北工业大学 | The diffraction method of nearly physiological status biological macromolecule crystal |
| CN110262587B (en) * | 2019-05-29 | 2023-11-03 | 南京航空航天大学 | Low-temperature loading device and temperature control method for intelligent temperature-controllable Hopkinson pressure bar test |
| CN112505245B (en) * | 2020-11-11 | 2023-02-14 | 山西科致成科技有限公司 | Multi-path standard gas flow control device for detecting mine gas sensor |
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| WO1999043994A1 (en) * | 1998-02-26 | 1999-09-02 | Lucid, Inc. | Confocal microscope for facilitating cryosurgery of tissue |
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