CN111059810A - Ultralow temperature refrigerating system and electronic expansion valve monitoring and control software - Google Patents
Ultralow temperature refrigerating system and electronic expansion valve monitoring and control software Download PDFInfo
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- CN111059810A CN111059810A CN202010038411.5A CN202010038411A CN111059810A CN 111059810 A CN111059810 A CN 111059810A CN 202010038411 A CN202010038411 A CN 202010038411A CN 111059810 A CN111059810 A CN 111059810A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
- F25B49/022—Compressor control arrangements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
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Abstract
The ultra-low temperature refrigeration system and the monitoring and control software of the electronic expansion valve are divided into three plates: system state, data acquisition and electronic expansion valve control and simulation; the software sets 3 different levels of login rights. The invention provides a simple and clear man-machine interaction interface with rich functions; the advantages of two control algorithms are exerted to control the electronic expansion valve by combining Fuzzy control and traditional PID control, namely Fuzzy PID control is utilized; the program compiled based on the high-level language has high stability, so that the running state of the refrigeration house is optimal, the running parameters and the adjustment control parameters are set quickly, the abnormal conditions of the unit are processed in time, and the method has practical significance for saving energy and reducing labor intensity. Meanwhile, the operation regulation and control reaction is rapid and timely, the operation is reliable, and the labor cost investment of the refrigeration house management is reduced.
Description
Technical Field
The invention relates to the field of ultralow temperature refrigeration monitoring, in particular to an ultralow temperature refrigeration system and electronic valve monitoring and control software.
Background
At present, most of detection and control systems related to the refrigeration houses at home and abroad are realized based on a PLC and a single chip microcomputer. The technology for constructing the refrigeration house monitoring system by using the PLC is relatively mature, and the high reliability of the PLC and the modularization idea of constructing the system enable the refrigeration house monitoring system to be popular among large and medium refrigeration house detection and control systems. However, the detection and control of a refrigeration house constructed by adopting the PLC require large early-stage capital investment, and the programming of the PLC is relatively complicated. The singlechip has the advantages of low cost and small volume, and can be flexibly designed according to the requirements of designers. However, the performance of the single chip microcomputer is not very stable, the design is relatively complex, and the development period is relatively long, so that the single chip microcomputer is generally suitable for controlling a small-sized refrigeration house and controlling a certain refrigeration component.
In 1986, the National Instruments (NI) first proposed the concept of Virtual Instrument technology (Virtual Instrument) by using high-performance modular hardware in combination with efficient and flexible software to perform various testing, measurement and automation applications. It uses mature mainstream computer technology, cooperates with innovative flexible software and modularized high-performance hardware products, and enables users to establish powerful computer-based instrument solutions. Nowadays, engineers and scientists in various countries around the world have used NI-LabVIEW graphical development tools in each link of a product design cycle, thereby improving product quality, shortening the time for putting products on the market, and improving product development and production efficiency. The integrated virtual instrument environment is used to be connected with the real world signal, data are analyzed to obtain practical information, information achievements are shared, and production efficiency is improved in a large range. The various tools provided by the virtual instrument can meet the needs of any project.
The virtual instrument is composed of hardware and software. The hardware of the virtual instrument is a computer and necessary electronic instrument hardware modules matched with the computer. The hardware body of the virtual instrument is an electronic computer, usually a personal computer, but also any general-purpose electronic computer. The electronic measurement instrument hardware modules configured for the computer are various sensors, signal conditioners, analog-to-digital converters (ADCs), digital-to-analog converters (DACs), data collectors (DAQs), etc. The two are combined by a program written by upper computer software (LabVIEW) to form a measurement and control platform. The computer and the electronic measuring instrument hardware module configured by the computer form the basis of a virtual instrument testing hardware platform. A user can monitor and control a measurement and control object through a simple and visual human-computer interaction interface, signals are regulated and controlled through test software, a final test result is obtained through the acquisition of an electronic measurement hardware platform and the processing of an electronic computer, and the final test result is displayed on the human-computer interface through a numerical value, a curve, a graph or even a multi-dimensional test result model. Of course, the test results can also be directly transmitted or recorded and stored through a computer network.
In the actual freezer operation control, the quality of goods in the storehouse depends on accurate, timely control, under original monitoring mode and system, can make the unable real time monitoring equipment's of staff running state, can not in time revise the operating parameter, leads to freezer unit operating condition can't adjust according to the change of environment, may ignore the problem that the unit appears in service even. The software can optimize the running state of the refrigeration house, quickly set running parameters and adjust control parameters, and timely process abnormal conditions of the unit, thereby having practical significance for saving energy and reducing labor intensity. Meanwhile, the operation regulation and control reaction is rapid and timely, the operation is reliable, and the labor cost investment of the refrigeration house management is reduced.
Compared with a thermostatic expansion valve, an electronic expansion valve is more and more popular among refrigeration users due to high automation, higher control precision and timely and quick control action, and becomes a main throttling element in a refrigeration system instead of the thermostatic expansion valve. The traditional electronic expansion valve control algorithm usually adopts PID control, but the high nonlinearity of the superheat degree of an evaporator outlet and the opening degree of an electronic expansion valve and the high coupling of refrigeration system components cause that a linear control system such as the PID cannot achieve good control effect.
Disclosure of Invention
The invention aims to realize user-oriented, simple and clear monitoring of a refrigeration system, monitoring and control of an electronic expansion valve and simulation of the electronic expansion valve on a man-machine interaction platform with rich functions through an ultralow-temperature refrigeration system and monitoring and control software of the electronic expansion valve.
The ultra-low temperature refrigeration system and the monitoring and control software of the electronic expansion valve are divided into three blocks: system state, data acquisition and electronic expansion valve control and simulation; the software sets 3 different levels of login rights.
The system state can be entered by clicking a 'system state' tab by a user;
the system state interface carries out real-time monitoring on the temperature, pressure, current and refrigerant mass flow state of a system measuring point, energy adjustment of a unit, the starting and stopping states of a high-low temperature stage compressor and real-time display of the opening of a valve; the system state interface can also perform the functions of starting and stopping the unit and setting the temperature of the target warehouse;
meanwhile, the system state interface is provided with a system alarm prompt and a system time prompt.
The data acquisition interface is used for displaying data acquisition and can display acquired data of temperature, pressure and refrigerant mass flow;
when a user needs to collect data, the data can be collected by clicking a data collection button on the right side of a data collection interface and turning the button green, and meanwhile, the data can be stored in a corresponding Excel table;
and when the data acquisition is required to be stopped, clicking the acquisition stopping button, turning the acquisition stopping button green, and dimming the data acquisition button.
The electronic expansion valve control and simulation interface displays the operation state of the electronic expansion valve, including the evaporation temperature, the evaporator outlet pressure and the evaporator outlet temperature;
when the valve is in an open state, the indicator light in the figure turns green, and when the valve is closed, the indicator light turns dark;
simultaneously displaying the superheat degree of an outlet of the evaporator, the opened time of the valve, the duty ratio and the parameter information of the operation procedure;
the electronic expansion valve control and simulation interface can realize the dragging, the zooming and the reduction of a curve through a chart tool of the interface;
in the electronic expansion valve control and simulation interface, a user can select a deflector rod through a controller at the upper left to select the controller, including PWM control and fuzzy control, and the name of the controller can be displayed at the right when the deflector rod is dialed to a corresponding position;
the superheat degree is set through a knob or an input control at the lower part, and the upper value and the lower value are synchronous;
the setting of control parameters can be carried out through a right PWM control tab and a fuzzy control tab, an action period and a period gap can be set in the PWM control tab, a fuzzy factor and scale factors Ke, Kec and Ku can be set in the fuzzy control tab, and the change of an output value can be observed in a chart by changing the three values;
the electronic expansion valve control and simulation interface comprises setting of simulation control parameters and display of an output curve, an address bar requires a user to select an fz file controlled by Fuzzy, and Fuzzy PID control simulation is carried out after selection;
"sp (setpoint)" is a set value for controlling superheat degree by simulation, three values at the right side of the interface are a P value, an I value and a D value, respectively, and a user can set the values according to experience, and "st (simulation time)" is a time value for continuous simulation;
PID control can be optimized using a Fuzzy control algorithm;
the user can read the data of the simulation time at the lower left corner and obtain the output curves of the PID control and the Fuzzy PID control.
The login authority requires a user to select a user name and input a password matched with the user name;
the login authority requires a user to click a menu file to pop up a login window of a login system; selecting a user name, inputting a password, clicking a 'login' button to log in the system, displaying the name of the current login user of the system on the left side of a state bar below the software, clicking a menu 'file' and then clicking 'login quit' in the state of logging in the system, namely, quitting the login state, and storing user information in a corresponding database table.
The invention provides a simple and clear man-machine interaction interface with rich functions; the advantages of two control algorithms are exerted to control the electronic expansion valve by combining Fuzzy control and traditional PID control, namely Fuzzy PID control is utilized; the program compiled based on the high-level language has high stability, so that the running state of the refrigeration house is optimal, the running parameters and the adjustment control parameters are set quickly, the abnormal conditions of the unit are processed in time, and the method has practical significance for saving energy and reducing labor intensity. Meanwhile, the operation regulation and control reaction is rapid and timely, the operation is reliable, and the labor cost investment of the refrigeration house management is reduced.
Drawings
FIG. 1 shows the user login information, PID control parameters and fuzzy PID control parameters of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software of the invention;
FIG. 2 is a system state interface diagram of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software of the present invention;
FIG. 3 is a diagram of a unit start-stop switch of a system state interface in the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention;
FIG. 4 is a fan electric heating start-stop switch of a system state interface in the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software of the invention;
FIG. 5 is a diagram of the reservoir temperature setting portion of the system status interface in the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software of the present invention;
FIG. 6 is a system alarm display portion of the system status interface in the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software of the present invention;
FIG. 7 is a data acquisition interface of the ultra-low temperature refrigeration system and the monitoring and control software of the electronic expansion valve of the present invention;
FIG. 8 is a section for displaying, selecting and collecting unit parameters in a data collection interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention;
FIG. 9 is an electronic expansion valve control and simulation interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software of the present invention;
FIG. 10 shows the status and control parameters of the electronic expansion valve in the electronic expansion valve control and simulation interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention;
FIG. 11 is a part of the superheat and control output curve of the evaporator outlet in the electronic expansion valve control and simulation interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software of the present invention;
FIG. 12 is a control mode and control parameter setting portion of the electronic expansion valve in the electronic expansion valve control and simulation interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention;
FIG. 13 is a fuzzy control parameter setting portion of the electronic expansion valve control and simulation interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention;
FIG. 14 is an electronic expansion valve simulation control interface in an electronic expansion valve control and simulation interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention;
FIG. 15 shows a PID control parameter setting part of an electronic expansion valve in an electronic expansion valve control and simulation interface of the electronic expansion valve simulation control interface in the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention;
FIG. 16 shows a fuzzy PID control parameter setting part of the electronic expansion valve in the electronic expansion valve control and simulation interface of the electronic expansion valve simulation control interface in the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention;
FIG. 17 is a simulation output curve portion of an electronic expansion valve simulation control interface in an electronic expansion valve control and simulation interface in the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention;
fig. 18 is a login window for the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software of the present invention.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.
The ultra-low temperature refrigeration system and the monitoring and control software of the electronic expansion valve are divided into three blocks: system state, data acquisition and electronic expansion valve control and simulation; the software sets 3 different levels of login rights.
The system state can be entered by clicking a 'system state' tab by a user;
the system state interface carries out real-time monitoring on the temperature, pressure, current and refrigerant mass flow state of a system measuring point, energy adjustment of a unit, the starting and stopping states of a high-low temperature stage compressor and real-time display of the opening of a valve; the system state interface can also perform the functions of starting and stopping the unit and setting the temperature of the target warehouse;
meanwhile, the system state interface is provided with a system alarm prompt and a system time prompt.
The data acquisition interface is used for displaying data acquisition and can display acquired data of temperature, pressure and refrigerant mass flow;
when a user needs to collect data, the data can be collected by clicking a data collection button on the right side of a data collection interface and turning the button green, and meanwhile, the data can be stored in a corresponding Excel table;
and when the data acquisition is required to be stopped, clicking the acquisition stopping button, turning the acquisition stopping button green, and dimming the data acquisition button.
The electronic expansion valve control and simulation interface displays the operation state of the electronic expansion valve, including the evaporation temperature, the evaporator outlet pressure and the evaporator outlet temperature;
when the valve is in an open state, the indicator light in the figure turns green, and when the valve is closed, the indicator light turns dark;
simultaneously displaying the superheat degree of an outlet of the evaporator, the opened time of the valve, the duty ratio and the parameter information of the operation procedure;
the electronic expansion valve control and simulation interface can realize the dragging, the zooming and the reduction of a curve through a chart tool of the interface;
in the electronic expansion valve control and simulation interface, a user can select a deflector rod through a controller at the upper left to select the controller, including PWM control and fuzzy control, and the name of the controller can be displayed at the right when the deflector rod is dialed to a corresponding position;
the superheat degree is set through a knob or an input control at the lower part, and the upper value and the lower value are synchronous;
the setting of control parameters can be carried out through a right PWM control tab and a fuzzy control tab, an action period and a period gap can be set in the PWM control tab, a fuzzy factor and scale factors Ke, Kec and Ku can be set in the fuzzy control tab, and the change of an output value can be observed in a chart by changing the three values;
the electronic expansion valve control and simulation interface comprises setting of simulation control parameters and display of an output curve, an address bar requires a user to select an fz file controlled by Fuzzy, and Fuzzy PID control simulation is carried out after selection;
"sp (setpoint)" is a set value for controlling superheat degree by simulation, three values at the right side of the interface are a P value, an I value and a D value, respectively, and a user can set the values according to experience, and "st (simulation time)" is a time value for continuous simulation;
PID control can be optimized using a Fuzzy control algorithm;
the user can read the data of the simulation time at the lower left corner and obtain the output curves of the PID control and the Fuzzy PID control.
The login authority requires a user to select a user name and input a password matched with the user name;
the login authority requires a user to click a menu file to pop up a login window of a login system; selecting a user name, inputting a password, clicking a 'login' button to log in the system, displaying the name of the current login user of the system on the left side of a state bar below the software, clicking a menu 'file' and then clicking 'login quit' in the state of logging in the system, namely, quitting the login state, and storing user information in a corresponding database table.
Fig. 1 shows user login information, PID control parameters, and FuzzyPID control parameters of monitoring and controlling software for an ultra-low temperature refrigeration system and an electronic expansion valve according to the present invention, wherein user login data, control parameters, simulation control parameters for the electronic expansion valve, and test curves of the monitoring and controlling system for the cryogenic refrigerator are read and written in through a Database, a Database connection provided by NI is used to establish connection with Microsoft Access, a table is created and deleted, and specific location data is queried, read, and written in.
FIG. 2 is a system state interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software of the invention, a user enters the interface of FIG. 2 by clicking a system state interface option card to monitor the system state, the left side is a flow chart of the cascade refrigeration system, the real-time data display of temperature, pressure, current and refrigerant mass flow points, the energy regulation of a unit, the starting and stopping states of a high-low temperature stage compressor and the real-time display of the valve opening are carried out; the right upper part is provided with a unit, a fan and an electric heating start-stop button which can control the start-stop of the unit, the right side is provided with a target warehouse temperature setting knob, and the warehouse temperature can be set through the upper knob or the lower input control; the lower right part is the alarm prompt of the system; the top column box is filled with the system name and the system time.
Fig. 3 and 4 are diagrams of a unit start-stop switch and a fan electric heating start-stop switch of a system state interface in the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software, wherein a user needs to manually start the fan for safety, the software firstly starts a high-low temperature level liquid supply valve of the fan of the refrigeration house, then starts a high-temperature level compressor, and then starts the low-temperature level compressor after waiting for 10-15 seconds; the electric heating is used for simulating load and stabilizing the temperature of the warehouse, and a user can start the electric heating when needed.
FIG. 5 is a database temperature setting portion of the system status interface in the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention, wherein the user can directly input the set value of the database temperature through the knob or the input control member below the knob, the input range is set to-60 deg.C-20 deg.C, and the temperature value exceeding the range is directly set to the nearest value.
Fig. 6 is a system alarm display part of the system status interface in the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software of the invention, when the system is abnormal, the alarm will be given, the buzzer will sound continuously, and the indication lamp which is abnormal in the plate will turn red to prompt the user that the abnormality occurs.
FIG. 7 is a data acquisition interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software of the present invention, wherein a user enters the data acquisition interface by clicking a "data acquisition interface" tab to perform data acquisition display; the upper left of the interface is a temperature display curve graph, the lower left is a pressure display curve graph, the upper right is the control of selecting and displaying multiple items of parameters and collecting data, and the lower right is the mass flow display of the refrigerator; the mouse is used for selecting the tool button at the lower left corner of each chart, so that the functions of the corresponding tool, including the movement of the charts and the zooming-in and zooming-out functions of the selected range data, can be obtained.
Fig. 8 is a unit parameter display selection and collection part in a data collection interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention, a user selects data displayed in a graph through the part, which are a temperature parameter, a reservoir temperature measurement point and a pressure parameter, respectively, and clicks a right down arrow with a mouse to select a parameter under the selection, wherein the selected parameter displays a symbol of "√" on the right side. Displaying real-time parameter data in a corresponding chart; when the user needs to carry out data acquisition, the button can be turned green by clicking the data acquisition button on the right side, then acquisition is carried out, all data can be saved in the corresponding Excel table, the user can check afterwards, when needs stop, the button is stopped to acquire by clicking, the button is turned green, and the data acquisition button is darkened simultaneously.
Fig. 9 is an electronic expansion valve control and simulation interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software of the present invention, a user enters the electronic expansion valve control and simulation interface by clicking an "electronic expansion valve control and simulation" option card, and the left side is the operation state of the electronic expansion valve; the upper right side is a graph for displaying the output and superheat degree of the electronic expansion valve; the middle is selection of a control mode and corresponding control parameter setting; and the lower right part is an electronic expansion valve simulation control interface which comprises the setting of each parameter and the display of a corresponding output curve.
FIG. 10 shows the operation states of the electronic expansion valve system including the evaporation temperature, the evaporator outlet pressure and the evaporator outlet temperature, and the electronic expansion valve state and control parameter part in the electronic expansion valve control and simulation interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software of the invention; when the valve is in an open state, the indicator light in the figure turns green, and when the valve is closed, the indicator light turns dark; the user can monitor the superheat degree of the evaporator outlet, the opening time of the valve and the duty ratio information at the lower part.
Fig. 11 is a diagram of the evaporator outlet superheat and control output curve portion in the electronic expansion valve control and simulation interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention, where the user can observe the evaporator outlet superheat, superheat set value and controller output value, and can implement the functions of curve dragging, zooming in and zooming out by the right lower graph tool.
Fig. 12 shows an electronic expansion valve control mode and control parameter setting portion in an electronic expansion valve control and simulation interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention, in the control mode and parameter interface, a user can select a lever through a controller on the upper left to select a controller, including PWM control and fuzzy control, to a corresponding position, and the name of the controller is displayed on the right.
FIG. 13 shows a fuzzy control parameter setting part in an electronic expansion valve control and simulation interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software, wherein the superheat degree is set through a lower knob or an input control, and the upper value and the lower value are synchronous; control parameters can be set through the right PWM control tab and the fuzzy control tab, and an action period and a period gap can be set in the PWM control tab; the fuzzy factors and the scale factors Ke, Kec, and Ku may be set in the fuzzy control tab, and changes in the output values may be observed in the above-described graph by changing these three values.
FIG. 14 is an electronic expansion valve simulation control interface in the electronic expansion valve control and simulation interface of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software of the present invention, including setting of simulation control parameters and display of output curves; the address bar requires the user to select the fz file controlled by Fuzzy, and Fuzzy PID control simulation can be carried out only after selection.
Fig. 15 shows the PID control parameter setting part of the electronic expansion valve in the electronic expansion valve control and simulation interface of the electronic expansion valve simulation control interface in the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention, in fig. 15, "sp (setpoint)" is the set value of the superheat degree of the simulation control, and the right three values are the P value, the I value, and the D value, respectively, and the user can set the "st (simulation time)" as the time value of the simulation duration according to experience.
Fig. 16 shows the Fuzzy PID control parameter setting part of the electronic expansion valve in the electronic expansion valve control in the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and controlling software and the electronic expansion valve simulation control interface in the simulation interface according to the present invention, and the user can modify the Fuzzy PID control parameter setting part according to the design of the user and optimize the PID control by using the Fuzzy control algorithm.
Fig. 17 is a portion of a simulation output curve of an electronic expansion valve simulation control interface in the electronic expansion valve control and simulation interface in the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention, and the output curves of PID control and Fuzzy PID control can be obtained from two graphs on the right side of the portion.
FIG. 18 is a view showing the login window of the ultra-low temperature refrigeration system and the electronic expansion valve monitoring and control software according to the present invention, wherein a user name is selected, a "login" button is clicked to login the system after a password is entered, the left side of a status bar below the software displays the name of the current login user of the system, and when the user has logged in the system, the user clicks a menu "file" - > "log out", and the user exits the login state, and the user information is stored in the corresponding database table.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (5)
1. Ultra-low temperature refrigerating system and electronic expansion valve monitoring and control software, its characterized in that:
the software was divided into three panels: system state, data acquisition and electronic expansion valve control and simulation;
the software sets 3 different levels of login rights.
2. The ultra-low temperature refrigeration system and electronic expansion valve monitoring and control software of claim 1, further characterized by:
the system state can be entered by clicking a 'system state' tab by a user;
the system state interface carries out real-time monitoring on the temperature, pressure, current and refrigerant mass flow state of a system measuring point, energy adjustment of a unit, the starting and stopping states of a high-low temperature stage compressor and real-time display of the opening of a valve; the system state interface can also perform the functions of starting and stopping the unit and setting the temperature of the target warehouse;
meanwhile, the system state interface is provided with a system alarm prompt and a system time prompt.
3. The ultra-low temperature refrigeration system and electronic expansion valve monitoring and control software of claim 1, further characterized by:
the data acquisition interface is used for displaying data acquisition and can display acquired data of temperature, pressure and refrigerant mass flow;
when a user needs to collect data, the data can be collected by clicking a data collection button on the right side of a data collection interface and turning the button green, and meanwhile, the data can be stored in a corresponding Excel table;
and when the data acquisition is required to be stopped, clicking the acquisition stopping button, turning the acquisition stopping button green, and dimming the data acquisition button.
4. The ultra-low temperature refrigeration system and electronic expansion valve monitoring and control software of claim 1, further characterized by:
the electronic expansion valve control and simulation interface displays the operation state of the electronic expansion valve, including the evaporation temperature, the evaporator outlet pressure and the evaporator outlet temperature;
when the valve is in an open state, the indicator light in the figure turns green, and when the valve is closed, the indicator light turns dark;
simultaneously displaying the superheat degree of an outlet of the evaporator, the opened time of the valve, the duty ratio and the parameter information of the operation procedure;
the electronic expansion valve control and simulation interface can realize the dragging, the zooming and the reduction of a curve through a chart tool of the interface;
in the electronic expansion valve control and simulation interface, a user can select a deflector rod through a controller at the upper left to select the controller, including PWM control and fuzzy control, and the name of the controller can be displayed at the right when the deflector rod is dialed to a corresponding position;
the superheat degree is set through a knob or an input control at the lower part, and the upper value and the lower value are synchronous;
the setting of control parameters can be carried out through a right PWM control tab and a fuzzy control tab, an action period and a period gap can be set in the PWM control tab, a fuzzy factor and scale factors Ke, Kec and Ku can be set in the fuzzy control tab, and the change of an output value can be observed in a chart by changing the three values;
the electronic expansion valve control and simulation interface comprises setting of simulation control parameters and display of an output curve, an address bar requires a user to select an fz file controlled by Fuzzy, and Fuzzy PID control simulation is carried out after selection;
"sp (setpoint)" is a set value for controlling superheat degree by simulation, three values at the right side of the interface are a P value, an I value and a D value, respectively, and a user can set the values according to experience, and "st (simulation time)" is a time value for continuous simulation;
PID control can be optimized using a Fuzzy control algorithm;
the user can read the data of the simulation time at the lower left corner and obtain the output curves of the PID control and the Fuzzy PID control.
5. The ultra-low temperature refrigeration system and electronic expansion valve monitoring and control software of claim 1, further characterized by:
the login authority requires a user to select a user name and input a password matched with the user name;
the login authority requires a user to click a menu file to pop up a login window of a login system; selecting a user name, inputting a password, clicking a 'login' button to log in the system, displaying the name of the current login user of the system on the left side of a state bar below the software, clicking a menu 'file' and then clicking 'login quit' in the state of logging in the system, namely, quitting the login state, and storing user information in a corresponding database table.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010038411.5A CN111059810A (en) | 2020-01-14 | 2020-01-14 | Ultralow temperature refrigerating system and electronic expansion valve monitoring and control software |
Applications Claiming Priority (1)
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| CN107067158A (en) * | 2017-03-01 | 2017-08-18 | 安徽谷之润食品有限公司 | A kind of New-style refrigeration house management system |
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| CN202393073U (en) * | 2011-12-24 | 2012-08-22 | 大连三洋压缩机有限公司 | Refrigerating system for ultra-low-temperature refrigerated storages |
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Application publication date: 20200424 |