Scientific research feedback teaching measurement and control experiment system based on CO2 transcritical refrigeration system

Abstract

A scientific research feedback teaching measurement and control experiment system based on a CO2 transcritical refrigeration system comprises a scientific research experiment table, a scientific research feedback teaching measurement and control test box and a teaching simulation experiment table. The scientific research experiment table is equipment for research and development of scientific research projects; the teaching simulation experiment table comprises an analog signal generator, a teaching simulation system and an analog signal receiver. The scientific research feedback teaching measurement and control test box comprises an equipment track, an air switch, a transformer, a Siemens PLC1200 CPU, a digital quantity module, an analog quantity input module, an analog quantity output module, a platinum resistor input module, a wireless module, a switch, a touch screen, a cooling fan, a shielding wire, a module extension line, a power supply indicating lamp and an aviation male and female plug. According to the invention, the simulation signal generator, the simulation signal receiver and the teaching simulation system form a teaching simulation experiment table which is connected with the measurement and control experiment box and the scientific research experiment table, so that the measurement and control experiment box can carry out real-time measurement and control on the scientific research experiment table and also can carry out teaching simulation measurement and control on the experiment table. Scientific research requirements are met, meanwhile, conversion of scientific research equipment to scientific research feedback teaching can be implemented stably and safely for a long time, and the strength of undergraduate teaching and postgraduate talent training is improved.

Description

Technical Field

[0001] The present invention relates to the measurement and control of refrigeration system principles, and specifically to a measurement and control experimental system for a refrigeration system, in particular to a measurement and control experimental system for a CO2 transcritical refrigeration system, and in particular to a scientific research feedback teaching measurement and control experimental system based on a CO2 transcritical refrigeration system with a PLC as the core. Background Art

[0002] In order to support the development strategy of giving priority to education, self-reliance in science and technology, and talent-led development, vocational undergraduate education must expand its horizons, innovate ideas, and actively conduct open reorganization and interactive integration with different educational levels and industrial elements. In particular, focusing on deepening the integration of industry and education, integrating science and education, and feeding back scientific research to teaching as a new development direction are the core contents of building a high-quality vocational education system and cultivating great craftsmen. As the core of the strategy of rejuvenating the country through science and education, scientific research feeding back teaching not only realizes the deep integration of education and science and technology, but also accelerates knowledge innovation and application, effectively promotes the cultivation of high-tech skilled talents, and provides solid talent and scientific and technological support for national modernization. This integration improves the quality of talent training and scientific research in both directions through the synergy of "science" and "education", and has become a key strategy for promoting innovation and improving education quality in the current education field.

[0003] In order to promote the feedback of scientific research to teaching, in the process of converting the experimental equipment of national scientific research projects into teaching equipment, we encountered a large number of students and students lacked practical scientific research experience. Because of the increase in uncontrollable factors in the experimental process, the risk of damage to the experimental equipment was very high. At the same time, the laboratory equipment was expensive and the maintenance cost was high, which made it difficult to continue the implementation of scientific research feedback teaching, resulting in many scientific research equipment being quickly damaged and losing their teaching value after being converted into teaching equipment. Summary of the invention

[0004] The purpose of the present invention is to solve the bottleneck problem of converting scientific research equipment into teaching equipment in scientific research feedback teaching, and to provide a scientific research feedback teaching measurement and control experimental system based on a CO2 transcritical refrigeration system, including a scientific research experimental table, a scientific research feedback teaching measurement and control experimental box and a teaching simulation experimental table. The scientific research experimental table is a device developed for a scientific research project. The present invention forms a teaching simulation experimental table connected to the measurement and control experimental box and the scientific research experimental table through an analog signal generator, an analog signal receiver and a teaching simulation system, so that the measurement and control experimental box can not only perform real-time measurement and control on the scientific research experimental table, but also perform teaching simulation measurement and control on the experimental table. It not only meets the scientific research requirements, but also can implement the transformation of scientific research equipment into scientific research feedback teaching stably, safely and for a long time, and enhance the strength of undergraduate teaching and graduate talent training. The CPU of the PLC is connected through the track in the box, and the expansion of digital quantity, analog quantity, communication and various functional modules are installed to meet the needs of different experimental purposes.

[0005] In order to achieve the above-mentioned purpose, one embodiment of the present invention provides a scientific research feedback teaching measurement and control experimental system based on a CO2 transcritical refrigeration system, including a scientific research feedback teaching measurement and control experimental box and a teaching simulation experimental table. The scientific research feedback teaching measurement and control experimental box includes: a scientific research feedback teaching measurement and control experimental box, an equipment track, an air switch, a transformer, a Siemens PLC1200 CPU, a digital quantity module, an analog quantity input module, an analog quantity output module, a platinum resistance input module, a wireless module, a switch, a touch screen, a cooling fan, a shielded wire, a module extension extension cable, a power supply indicator light, and an aviation male and female plug; the equipment track includes a first equipment track and a second equipment track; the equipment track is installed in the bottom of the experimental box and installed horizontally from top to bottom; the touch screen and the power supply indicator light are installed on the experimental box cover; the cooling fan is installed at the rear of the experimental box; the air switch, transformer, Siemens PLC1200 CPU, a digital quantity module, and two analog quantity input modules are installed on the first equipment track in sequence; the analog quantity input module, two analog quantity output modules, two platinum resistance input modules, a remote module, and a switch are installed on the second equipment track in sequence. The teaching simulation experiment platform includes an analog signal generator, an analog signal receiver and a teaching simulation system. The analog signal generator sends out the signal simulated by the teaching simulation system, and the analog signal receiver and PLC receive the signal, or the signal of the analog signal generator changes after corresponding control, collects various types of data, and then transmits the data to the LabVIEW software supporting the experimental box through the communication module, and conducts in-depth analysis of the data to achieve simulation measurement and control of the CO2 transcritical refrigeration system.

[0006] Preferably, equipment developed based on other scientific research projects can be designed into a scientific research feedback teaching measurement and control experiment system according to the design ideas of the present invention. During the design process, the size of the experiment box, the openings and the track layout can be designed according to the actual number of modules to realize the conversion of non-standard customized teaching equipment.

[0007] Preferably, the electrical parameter acquisition module is connected to the PLC; the measured real-time data is transmitted to the PLC.

[0008] Preferably, an analog signal generator is used to simulate the real data of the experimental bench, and an analog signal receiver is used to control the feedback of the analog signal generator to cause its signal change. The simulation system of the teaching simulation experimental bench is used as a bridge to achieve simulation measurement and control of the experimental bench.

[0009] Preferably, when the shielded wire is used to collect temperature, a four-core shielded wire and matching male and female connectors are used; when used to collect pressure, the shielded wire should be larger than two cores; and the remaining data points are connected using ordinary wires.

[0010] Preferably, the real-time network communication performs real-time data transmission through a switch or a network cable; the measured real-time data is transmitted to the matching LabVIEW software.

[0011] The main purpose of the scientific research feedback teaching measurement and control experimental system is to simulate the real system so that students can establish an intuitive understanding and learning of the overall process of the experiment and the overall structure of the equipment used through the simulation system without actual operation experience, and enhance their familiarity and application of the equipment and software functions. The significance of the scientific research feedback teaching measurement and control experimental system is that it becomes an important bridge connecting theoretical teaching and experimental teaching, cultivates students' thinking of combining theory with practice, and extends the connotation of experimental teaching in time and space. The design invention of the scientific research feedback teaching measurement and control experimental system aims to feed back the equipment of the scientific research project to teaching, which is convenient for teaching and simulation experiments. Based on the measurement and control of the CO2 transcritical refrigeration system, the present invention designs a kind of easy-to-operate and portable, capable of real-time network communication, and with supporting LabVIEW software to support the process learning of experimental operation and intuitive analysis of data. Other expansion modules can be added to perform equipment control, data acquisition, wireless communication, simulation control and other functions, and the module controls can be flexibly changed according to the different needs of the experiment. Through the design of the present invention, a new idea is provided for the measurement and control based on the CO2 transcritical refrigeration system. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a relationship diagram of the three platforms of the scientific research experiment platform, the scientific research feedback teaching measurement and control experiment box, and the teaching simulation experiment platform of the CO2 transcritical refrigeration system of the present invention.

[0013] Figure 2 It is a left view of the scientific research feedback teaching measurement and control experiment box based on the CO2 transcritical refrigeration system of the present invention, including 1-5 wire routing reserved holes.

[0014] Figure 3 This is the main view (rear) of the scientific research feedback teaching measurement and control experiment box based on the CO2 transcritical refrigeration system of the present invention, including 6 cooling fan reserved holes.

[0015] Figure 4 It is the right view of the scientific research feedback teaching measurement and control experiment box based on the CO2 transcritical refrigeration system of the present invention, including 7-17-temperature acquisition line reserved holes, 18-29-pressure acquisition line reserved holes, 30-40-digital quantity / analog quantity acquisition line reserved holes.

[0016] Figure 5 It is a top view of the scientific research feedback teaching measurement and control experiment box based on the CO2 transcritical refrigeration system of the present invention, including 41-reserved installation position inside the electrical parameter module cover, 42-reserved hole for power indicator light, 43-reserved hole for power supply indicator light, and 44-reserved hole for touch screen.

[0017] Figure 6This is a schematic diagram of a top-down track of a scientific research feedback teaching measurement and control experiment box based on a CO2 transcritical refrigeration system of the present invention, including 45-a first equipment track, 46-a second equipment track, 47-an air switch, 48-a transformer, 49-a Siemens PLC1200CPU, 50-a digital quantity module, 51-a first analog quantity input module, 52-a second analog quantity input module, 53-a third analog quantity input module, 54-a first analog quantity output module, 55-a second analog quantity output module, 56-a first platinum resistance input module, 57-a second platinum resistance input module, 58-a remote module, and 59-a switch.

[0018] Figure 7 This is a front view of the box body of the scientific research feedback teaching measurement and control experiment box based on the CO2 transcritical refrigeration system of the present invention.

[0019] Figure 8 The invention discloses a teaching simulation experiment platform for a scientific research feedback teaching measurement and control experiment system based on a CO2 transcritical refrigeration system, comprising 60 - an analog signal generator, 61 - a teaching simulation system, and 62 - an analog signal receiver. DETAILED DESCRIPTION

[0020] The following describes the implementation of the present invention in detail by taking specific embodiments as examples in conjunction with the accompanying drawings.

[0021] The scientific research feedback teaching measurement and control experiment box based on the CO2 transcritical refrigeration system of the present invention is designed for the purpose of equipment start and stop and data collection, and the box size is: 500×400×150mm.

[0022] like Figure 2 The left view of a scientific research feedback teaching control experiment box based on a CO2 transcritical refrigeration system provided by an embodiment of the present invention is shown. A hole with a radius of 15 mm is drilled at 66 mm from the left margin and 75 mm from the top margin for subsequent power supply and other wires, and then holes are drilled horizontally to the right at intervals of 66 mm from the center of the first hole, for a total of 5 holes.

[0023] like Figure 3 The front view (rear) of a scientific research feedback teaching control experiment box based on a CO2 transcritical refrigeration system provided by an embodiment of the present invention is shown. A rectangular window 160 mm long and 80 mm wide is opened to the lower right at a distance of 170 mm from the left margin and 35 mm from the upper margin for installing a cooling fan.

[0024] like Figure 4The right view of a scientific research feedback teaching control experiment box based on a CO2 transcritical refrigeration system provided by an embodiment of the present invention is shown. A hole with a radius of 8mm is punched at 30mm from the left margin and 75mm from the upper margin for subsequent data acquisition lines, and then holes are punched horizontally to the right at intervals of 30mm from the center of the first hole, for a total of 12 holes. Based on this row of holes, holes with a radius of 8mm are punched at 25mm above and below and 47.5mm from the left margin, and then holes are punched horizontally to the right at intervals of 30mm from the center of the first hole, for a total of 11 holes per row. A total of 34 holes are punched in three rows.

[0025] like Figure 5 The top view of a scientific research feedback teaching control experiment box based on a CO2 transcritical refrigeration system provided by an embodiment of the present invention is shown. Two holes with a radius of 11 mm are drilled at 154 mm from the left and right margins and 130 mm from the upper margin on the upper cover for installing the power supply and power indicator light. A rectangular window with a length of 192 mm and a width of 138 mm is opened to the lower right at 154 mm from the left margin and 200 mm from the upper margin for installing the touch screen. The electrical parameter module is installed at a suitable position between the indicator lights on the inner side of the upper cover.

[0026] like Figure 6 A schematic diagram of a top view of a track of a scientific research feedback teaching control experiment box based on a CO2 transcritical refrigeration system provided by an embodiment of the present invention is shown. A first equipment track 45 and a second equipment track 46 with a length of 420 mm are installed to the right at a distance of 40 mm from the left margin and 120 mm from the upper and lower margins for subsequent equipment installation and module connection.

[0027] An air switch 47, a transformer 48, a Siemens PLC1200CPU 49, a digital quantity module 50, and a first analog quantity input module 51 are installed in sequence on the first equipment track 45; a second analog quantity input module 52, a third analog quantity input module 53, a first analog quantity output module 54, a second analog quantity output module 55, a first platinum resistance input module 56, a second platinum resistance input module 57, a remote module 58, and a switch 59 are installed in sequence on the second equipment track 46; the equipment between the two tracks is connected using a module extension extension cable.

[0028] Equipment developed based on other scientific research projects can be designed into scientific research feedback teaching measurement and control experiment boxes based on the design ideas of this invention. During the design process, the experiment box size, openings and track layout can be designed according to the actual number of modules to realize the transformation of non-standard customized teaching equipment.

[0029] The present invention is based on the measurement and control of the CO2 transcritical refrigeration system, and designs a device that is easy to operate and carry, capable of real-time network communication, and equipped with supporting LabVIEW software to support process learning of experimental operations and intuitive analysis of data. A teaching simulation experiment table is formed by an analog signal generator, an analog signal receiver, and a teaching simulation system, which is connected to a measurement and control experiment box and a scientific research experiment table, so that the measurement and control experiment box can not only perform real-time measurement and control on the scientific research experiment table, but also perform teaching simulation measurement and control on the experiment table. A new idea is provided for the measurement and control of the CO2 transcritical refrigeration system.

[0030] The above embodiments are merely illustrative of the design principles and uses of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A scientific research feedback teaching measurement and control experimental system based on a CO2 transcritical refrigeration system, characterized by: The scientific research feedback teaching measurement and control experimental system based on the CO2 transcritical refrigeration system includes a scientific research experimental table, a scientific research feedback teaching measurement and control experimental box and a teaching simulation experimental table; The scientific research laboratory bench is a device developed for scientific research projects; The teaching simulation experimental platform comprises a simulation signal generator (60), a teaching simulation system (61), and a simulation signal receiver (62); The scientific research feedback teaching control test box comprises a first wire routing reserved hole (1), a second wire routing reserved hole (2), a third wire routing reserved hole (3), a fourth wire routing reserved hole (4), a fifth wire routing reserved hole (5), a cooling fan reserved hole (6), a first temperature acquisition line reserved hole (7), a second temperature acquisition line reserved hole (8), a third temperature acquisition line reserved hole (9), a fourth temperature acquisition line reserved hole (10), a fifth temperature acquisition line reserved hole (11), a sixth temperature acquisition line reserved hole (12), a seventh temperature acquisition line reserved hole (13), an eighth temperature acquisition line reserved hole (14), a ninth temperature acquisition line reserved hole (15), The tenth temperature acquisition line reserved hole (16), the eleventh temperature acquisition line reserved hole (17), the first pressure acquisition line reserved hole (18), the second pressure acquisition line reserved hole (19), the third pressure acquisition line reserved hole (20), the fourth pressure acquisition line reserved hole (21), the fifth pressure acquisition line reserved hole (22), the sixth pressure acquisition line reserved hole (23), the seventh pressure acquisition line reserved hole (24), the eighth pressure acquisition line reserved hole (25), the ninth pressure acquisition line reserved hole (26), the tenth pressure acquisition line reserved hole (27), the eleventh pressure acquisition line reserved hole (28), the twelfth pressure acquisition line reserved hole (29), the first digital quantity / analog quantity acquisition A reserved hole for a digital / analog acquisition line (30), a reserved hole for a second digital / analog acquisition line (31), a reserved hole for a third digital / analog acquisition line (32), a reserved hole for a fourth digital / analog acquisition line (33), a reserved hole for a fifth digital / analog acquisition line (34), a reserved hole for a sixth digital / analog acquisition line (35), a reserved hole for a seventh digital / analog acquisition line (36), a reserved hole for an eighth digital / analog acquisition line (37), a reserved hole for a ninth digital / analog acquisition line (38), a reserved hole for a tenth digital / analog acquisition line (39), a reserved hole for an eleventh digital / analog acquisition line (40), and a reserved installation position inside the cover plate of the electrical parameter module (41), a reserved hole for a power indicator light (42), a reserved hole for a power supply indicator light (43), a reserved hole for a touch screen (44), a first equipment track (45), a second equipment track (46), an air switch (47), a transformer (48), a Siemens PLC1200 CPU (49), a digital quantity module (50), a first analog quantity input module (51), a second analog quantity input module (52), a third analog quantity input module (53), a first analog quantity output module (54), a second analog quantity output module (55), a first platinum resistance input module (56), a second platinum resistance input module (57), a remote module (58), and a switch (59); The scientific research feedback teaching measurement and control experiment box is punched with a hole of 10-20mm radius at 66mm from the left margin and 75mm from the upper margin from the left side of the box body, and then punched with holes at intervals of 50-80mm horizontally to the right from the center of the first hole, for a total of 5 holes, which are reserved holes (1) for the first wire routing, reserved holes (2) for the second wire routing, reserved holes (3) for the third wire routing, reserved holes (4) for the fourth wire routing, and reserved holes (5) for the fifth wire routing; from the right side of the box body, holes with a radius of 8-15mm are punched at 30mm from the left margin and 75mm from the upper margin for subsequent data acquisition lines, and then punched with holes at intervals of 25-35mm horizontally to the right from the center of the first hole, for a total of 12 holes, and with this row of holes as a reference, holes with a radius of 8mm are punched at intervals of 20-30mm above and below and 47.5mm from the left margin, and then punched with holes at intervals of 25-35mm horizontally to the right from the center of the first hole, for a total of 11 holes per row.A total of 34 holes are punched in three rows, from top to bottom and from left to right, namely, the first temperature collection line reserved hole (7), the second temperature collection line reserved hole (8), the third temperature collection line reserved hole (9), the fourth temperature collection line reserved hole (10), the fifth temperature collection line reserved hole (11), the sixth temperature collection line reserved hole (12), the seventh temperature collection line reserved hole (13), the eighth temperature collection line reserved hole (14), the ninth temperature collection line reserved hole (15), the tenth temperature collection line reserved hole (16), the eleventh temperature collection line reserved hole (17), and the first pressure collection line reserved hole (18). , a second pressure collection line reserved hole (19), a third pressure collection line reserved hole (20), a fourth pressure collection line reserved hole (21), a fifth pressure collection line reserved hole (22), a sixth pressure collection line reserved hole (23), a seventh pressure collection line reserved hole (24), an eighth pressure collection line reserved hole (25), a ninth pressure collection line reserved hole (26), a tenth pressure collection line reserved hole (27), an eleventh pressure collection line reserved hole (28), a twelfth pressure collection line reserved hole (29), a first digital quantity / analog quantity collection line reserved hole (30), a second digital quantity / analog quantity collection line reserved hole (31), a second digital quantity / analog quantity collection line reserved hole (32), a third pressure collection line reserved hole (33), a fourth pressure collection line reserved hole (34), a fifth pressure collection line reserved hole (35), a sixth pressure collection line reserved hole (36), a seventh pressure collection line reserved hole (37), a eighth pressure collection line reserved hole (38), a ninth pressure collection line reserved hole (39), a tenth pressure collection line reserved hole (40), a eleventh pressure collection line reserved hole (41), a twelfth pressure collection line reserved hole (42), a first digital quantity / analog quantity collection line reserved hole (43), a second digital quantity / analog quantity collection line reserved hole (44), a a reserved hole (31) for a digital quantity / analog quantity acquisition line, a reserved hole (32) for a third digital quantity / analog quantity acquisition line, a reserved hole (33) for a fourth digital quantity / analog quantity acquisition line, a reserved hole (34) for a fifth digital quantity / analog quantity acquisition line, a reserved hole (35) for a sixth digital quantity / analog quantity acquisition line, a reserved hole (36) for a seventh digital quantity / analog quantity acquisition line, a reserved hole (37) for an eighth digital quantity / analog quantity acquisition line, a reserved hole (38) for a ninth digital quantity / analog quantity acquisition line, a reserved hole (39) for a tenth digital quantity / analog quantity acquisition line, and a reserved hole (40) for an eleventh digital quantity / analog quantity acquisition line; the first equipment rail An air switch (47), a transformer (48), a Siemens PLC1200 CPU (49), a digital quantity module (50), and a first analog quantity input module (51) are sequentially installed on the track; a second analog quantity input module (52), a third analog quantity input module (53), a first analog quantity output module (54), a second analog quantity output module (55), a first platinum resistance input module (56), a second platinum resistance input module (57), a remote module (58), and a switch (59) are sequentially installed on the second equipment track; and the equipment between the two tracks is connected by using a module extension extension cable.

2. The scientific research feedback teaching measurement and control experimental system based on the CO2 transcritical refrigeration system according to claim 1 is characterized by: The first wire routing reserved hole (1), the second wire routing reserved hole (2), the third wire routing reserved hole (3), the fourth wire routing reserved hole (4), and the fifth wire routing reserved hole (5) have a hole radius of 15 mm and are punched at intervals of 66 mm horizontally.

3. The scientific research feedback teaching measurement and control experimental system based on the CO2 transcritical refrigeration system according to claim 1 is characterized by: The first temperature acquisition line reserved hole (7), the second temperature acquisition line reserved hole (8), the third temperature acquisition line reserved hole (9), the fourth temperature acquisition line reserved hole (10), the fifth temperature acquisition line reserved hole (11), the sixth temperature acquisition line reserved hole (12), the seventh temperature acquisition line reserved hole (13), the eighth temperature acquisition line reserved hole (14), the ninth temperature acquisition line reserved hole (15), the tenth temperature acquisition line reserved hole (16), the eleventh temperature acquisition line reserved hole (17), the first pressure acquisition line reserved hole (18), the second pressure acquisition line reserved hole (19), the third pressure acquisition line reserved hole (20), the fourth pressure acquisition line reserved hole (21), the fifth pressure acquisition line reserved hole (22), the sixth pressure acquisition line reserved hole (23), the seventh pressure acquisition line reserved hole (24), the eighth pressure acquisition line reserved hole (25), and the ninth pressure acquisition line reserved hole (26) , a tenth pressure collection line reserved hole (27), an eleventh pressure collection line reserved hole (28), a twelfth pressure collection line reserved hole (29), a first digital quantity / analog quantity collection line reserved hole (30), a second digital quantity / analog quantity collection line reserved hole (31), a third digital quantity / analog quantity collection line reserved hole (32), a fourth digital quantity / analog quantity collection line reserved hole (33), a fifth digital quantity / analog quantity collection line reserved hole (34), a sixth digital quantity / analog quantity collection line reserved hole (35), a seventh digital quantity / analog quantity collection line reserved hole (36), an eighth digital quantity / analog quantity collection line reserved hole (37), a ninth digital quantity / analog quantity collection line reserved hole (38), a tenth digital quantity / analog quantity collection line reserved hole (39), and an eleventh digital quantity / analog quantity collection line reserved hole (40), the hole radius is 8 mm, the holes are punched at intervals of 30 mm horizontally, and at intervals of 25 mm vertically.

4. The scientific research feedback teaching measurement and control experimental system based on the CO2 transcritical refrigeration system according to claim 1 is characterized by: The cooling fan reserved hole (6) is a rectangular window with a length of 160 mm and a width of 80 mm, which is opened to the lower right at a distance of 170 mm from the left margin and 35 mm from the upper margin.

5. The scientific research feedback teaching measurement and control experimental system based on the CO2 transcritical refrigeration system according to claim 1 is characterized by: The power indicator light reserved hole (42) and the power supply indicator light reserved hole (43) are respectively punched with a radius of 11 mm at a distance of 154 mm from the left and right margins and 130 mm from the upper margin of the upper cover.

6. The scientific research feedback teaching measurement and control experimental system based on the CO2 transcritical refrigeration system according to claim 1 is characterized by: The touch screen reserved hole (44) is a rectangular window with a length of 192 mm and a width of 138 mm opened to the lower right at a distance of 154 mm from the left side of the upper cover and 200 mm from the upper margin.

7. The scientific research feedback teaching measurement and control experimental system based on the CO2 transcritical refrigeration system according to claim 1 is characterized by: The electrical parameter acquisition module is connected to the PLC; the measured real-time data is transmitted to the PLC.

8. The scientific research feedback teaching measurement and control experimental system based on the CO2 transcritical refrigeration system according to claim 1 is characterized by: An analog signal generator (60) is used to simulate real data of the experimental bench; and an analog signal receiver (62) is used to control the feedback analog signal generator to cause its signal to change.

9. The scientific research feedback teaching measurement and control experimental system based on the CO2 transcritical refrigeration system according to claim 1 is characterized by: Equipment developed based on other scientific research projects can be designed into scientific research feedback teaching measurement and control experiment boxes based on the design ideas of this invention. During the design process, the experiment box size, openings and track layout can be designed according to the actual number of modules to realize the transformation of non-standard customized teaching equipment.

10. The scientific research feedback teaching measurement and control experimental system based on the CO2 transcritical refrigeration system according to claim 1 is characterized by: The shielded wire is used for collecting temperature with four-core shielded wire and matching male and female connectors; when used for collecting pressure, the shielded wire should be larger than two cores; the remaining data points are connected with ordinary wires; The real-time network communication performs real-time data transmission via a switch (59) or a network cable; the measured real-time data is transmitted to the matching LabVIEW software.

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