CN217213478U

CN217213478U - Refrigeration plant IoT centralized monitoring system

Info

Publication number: CN217213478U
Application number: CN202220791234.2U
Authority: CN
Inventors: 王亮; 王晨; 代小军; 范成平; 车陆宽; 李季; 孙绍官; 李立君; 沈治涛; 腾鹏; 代昌明; 刘振楠; 姜忠龄
Original assignee: Dalian Bingshan Guardian Automation Co ltd; Panasonic Appliances Cold Chain Dalian Co Ltd
Current assignee: Dalian Bingshan Guardian Automation Co ltd; Panasonic Appliances Cold Chain Dalian Co Ltd
Priority date: 2022-04-07
Filing date: 2022-04-07
Publication date: 2022-08-16
Anticipated expiration: 2032-04-07

Abstract

The utility model discloses a refrigeration plant IoT centralized monitoring system, which belongs to the technical field of refrigeration plant monitoring and comprises an end equipment layer, an edge control layer and a cloud platform layer; the terminal equipment layer comprises refrigeration equipment and a terminal controller connected with the refrigeration equipment; the edge control layer comprises an LoRa wireless communication module and an industrial Internet of things gateway, and the LoRa wireless communication module is connected between the terminal controller and the industrial Internet of things gateway; the cloud platform layer comprises an industrial internet platform, and the industrial internet platform is in communication connection with the industrial internet of things gateway. The utility model discloses make things convenient for more whole environment and the inside active state of freezer of the super convenience store on-the-spot freezer of accuse merchant, effectively improved the degree of automation of freezer data monitoring and maintenance.

Description

IoT (Internet of things) centralized monitoring system for refrigeration equipment

Technical Field

The utility model belongs to the technical field of the refrigeration plant control, concretely relates to super convenience store refrigeration plant IoT centralized monitoring system of merchant based on loRa wireless communication technique.

Background

The existing refrigerating equipment of the supermarket store is too scattered and large in size, so that the parameter data of the refrigerating equipment of the supermarket store and the state information of the refrigerator are inconvenient for a supermarket manager to integrally master; the intellectualization of the refrigeration equipment of the current supermarket convenience store is insufficient, people need to be attended or investigated under the common condition, and the refrigeration equipment cannot be intelligently and automatically adjusted and controlled correspondingly according to the real-time state of the current refrigeration equipment; because the existing refrigeration equipment is relatively independent, the operation working conditions of each equipment are different, different characteristics cannot be effectively displayed, and valuable operation data parameters are lost; at present, most of refrigerator control is single individual management, group control and analysis cannot be achieved, data parameters are lost, management is blocked, and power consumption is large.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defect that the on-spot freezer product of the super convenience store of current merchant or controller distribute too dispersedly, not good management and control, the utility model provides a refrigeration plant IoT centralized monitoring system makes things convenient for whole environment and the inside active state of freezer of the super convenience store on-spot freezer of accuse merchant more, has effectively improved the degree of automation of freezer data monitoring and maintenance.

The utility model discloses a solve the technical scheme that its technical problem adopted and be: an IoT (Internet of things) centralized monitoring system for refrigeration equipment comprises an end equipment layer, an edge control layer and a cloud platform layer; the terminal equipment layer comprises refrigeration equipment and a terminal controller connected with the refrigeration equipment; the edge control layer comprises an LoRa wireless communication module and an industrial Internet of things gateway, and the LoRa wireless communication module is connected between the terminal controller and the industrial Internet of things gateway; the cloud platform layer comprises an industrial internet platform, and the industrial internet platform is in communication connection with the industrial internet of things gateway.

As a further embodiment of the present invention, the industrial internet of things gateway is further connected to the configuration touch screen.

As a further embodiment of the utility model, the terminal control ware includes freezer controller and freezer controller, and the freezer in freezer controller and the refrigeration plant corresponds to be connected, and the freezer controller corresponds with the freezer in the refrigeration plant and is connected.

As a further embodiment of the present invention, the refrigerator controller comprises an MCU micro control unit, and an analog input unit, a digital input unit, an analog output unit, a digital output unit, an electronic expansion valve output unit, a dimming output unit and a communication unit respectively connected to the MCU micro control unit, wherein the communication unit comprises an RS485 communication bus interface a and an RS485 communication bus interface b;

the power supply also comprises a switching power supply and a system power supply, wherein the switching power supply comprises an external AC220V voltage input end and a transformer which are connected, the transformer is connected with the system power supply, and the system power supply is connected with the units to supply power for the units.

As the utility model discloses a further embodiment, MCU microcontrol unit adopts the STM32 treater as main control chip, STM32 treater is connected with real-time clock module and external memory.

As a further embodiment of the utility model, the analog input unit adopts an ADC module inside the MCU, and the analog output unit adopts a DAC module or PWM output inside the MCU;

the digital quantity input unit comprises a switching value input module and a dry node input module, and the switching value input module is connected with the MCU through a photoelectric coupler; the dry node input module is connected with a magnetic bead, the magnetic bead is connected with a single-phase conduction diode, the single-phase conduction diode is connected with an upper pull resistor, and the upper pull resistor is connected with a system power supply; the digital quantity output unit comprises a relay output module and a transistor output module.

As a further embodiment of the present invention, the electronic expansion valve output unit includes a voltage pulse type electronic expansion valve and a PWM type electronic expansion valve; the voltage pulse type electronic expansion valve is connected with a capacitor, the capacitor is connected with an ULN2003 driving chip, and the ULN2003 driving chip is connected with the MCU; the PWM type electronic expansion valve is connected with a bidirectional thyristor, the bidirectional thyristor is connected with an optocoupler, and the optocoupler is connected with an MCU (microprogrammed control unit).

As a further embodiment of the present invention, the dimming output unit includes a darlington transistor, and the darlington transistor is connected to the electronic ballast.

As a further embodiment of the present invention, the freezer controller comprises an MCU integrated on the collection board, and a digital signal input circuit, a digital signal output circuit, an analog input circuit, an analog output circuit, and a communication circuit respectively connected to the MCU; the power supply is connected with the MCU, the digital signal input circuit, the digital signal output circuit, the analog quantity input circuit, the analog quantity output circuit and the communication circuit to supply power for the MCU, the digital signal input circuit, the digital signal output circuit, the analog quantity input circuit, the analog quantity output circuit and the communication circuit.

As a further embodiment of the present invention, the MCU employs GD32F103VET6 chip, and the digital signal input circuit includes a plurality of pull-up resistors; the digital signal output circuit comprises a relay, the relay is connected with the MCU through an ULN2003 chip, and the digital signal output circuit also comprises a bidirectional thyristor, and the bidirectional thyristor is connected with the MCU through a bidirectional thyristor driver; the analog quantity input circuit comprises two parts, wherein one part is a circuit applied to the temperature sensor and is respectively used as a voltage division circuit of 8 paths of temperature through eight resistors, the other part is a circuit applied to the pressure sensor, and a pin in the middle of a cold storage controller acquisition board socket CN1-CN3 is used as an analog quantity signal input end and is connected with the MCU; the analog output circuit comprises an operational amplifier and a PWM signal output module which are respectively connected with the MCU, and also comprises two paths of stepping electronic expansion valves, and the stepping electronic expansion valves are connected with the MCU through a ULN2003 chip; the communication circuit adopts an SP3485EN-L/TR chip.

The beneficial effects of the utility model include: the problems that the refrigerator products or controllers in the on-site shop and super convenience store are too dispersed in distribution, poor in management and control and the like are solved through LoRa wireless communication; meanwhile, LoRa wireless communication is low in power consumption, long in transmission distance and strong in penetrating power, so that the advantage is more obvious in the application of the scene. The integrated monitoring system of the refrigeration equipment IoT of the super convenience store based on the LoRa wireless communication technology is more convenient for managers to integrally control the environment of the on-site refrigerator of the super convenience store and the activity state inside the refrigerator, and meanwhile, various operating parameters and environment states in the on-site refrigerator of the super convenience store can be monitored in real time on a cloud platform layer; if an emergency situation occurs, a manager can make a quick response according to the real-time state, so that the emergency problem of the on-site refrigerator can be solved timely and efficiently; the automation degree of freezer data monitoring and maintenance is effectively improved, and meanwhile, unnecessary consumption of human resources in the management and inspection processes is greatly saved.

Drawings

FIG. 1 is a view of the overall structure of the present invention;

FIG. 2 is a frame diagram of the present invention;

FIG. 3 is a schematic diagram of the overall layout of the refrigerator controller of the present invention;

FIG. 4 is a diagram of the refrigerator controller according to the present invention;

FIG. 5 is an illustrative view of the port of the refrigerator controller of the present invention;

FIG. 6 is a schematic diagram of the cooling cabinet controller;

FIG. 7 is a diagram of the refrigeration storage controller according to the present invention;

fig. 8 is an explanatory view of the shape of the LoRa wireless communication module of the present invention.

The reference numbers in the figures illustrate: 1. refrigeration plant, 2, terminal controller, 3, loRa wireless communication module, 4, industry thing allies oneself with the gateway, 5, industry internet platform, 6, configuration touch-sensitive screen, 7, MCU little the control unit, 8, analog input unit, 9, analog output unit, 10, digital input unit, 11, digital output unit, 12, electronic expansion valve output unit, 13, the output unit that adjusts luminance, 14, RS485 communication bus interface an, 15, RS485 communication bus interface b, 16, outside AC220V voltage input end, 17, transformer, 18, system power supply.

19. Operational amplifier, 20, analog IC, 21, debugging interface, 22, microcontroller, 23, lithium battery, 24, buzzer, 25, electrolytic capacitor, 26, inductor, 27, power supply IC, 28, rectifier bridge, 29, transient suppression diode, 30, glass discharge tube, 31, piezoresistor, 32, optical coupler, 33, silicon controlled rectifier, 34, safety capacitor, 35, relay, 36, communication interface board plug-in type, 37, communication interface chip, 38, fuse, 39, pressure input a, 40, temperature input a, 41, dimming output, 42, transformer secondary terminal, 43, fan output, 44, transformer primary terminal, 45, power supply input, 46, AKV electronic expansion valve, 47, alarm output, 48, outside cabinet lighting/inside cabinet lighting, 49, defrosting synchronization, 50, heating output/refrigerating output, 51, non-cold output, 52, backup relay output, 53. the remote switch, 54, communication signals, 55, DC12V solid-state relay, 56, monitoring computer, 57, spare 485 communication, 58, display, 59, upper computer/cascade/RS 485 communication interface a, 60, electronic expansion valve, 61, analog output, 62, MCU chip, 63, 220V power supply, 64, electrical fuse, 65, JTAG programming port, 66, phase sequence detection part, 67, upper computer/cascade/RS 485 communication interface b, 68, frequency converter RS485 communication interface, 69, analog input, 70, switching value input, 71, antenna connector, 72, IOT extension socket, 73, temperature input b, 74, pressure input b, 75, progressive electronic expansion valve, 76, digital tube, 77, key switch, 78, LED indicator, 79, 7A resistance-capacitance relief, 80, relay output, 81, SSR relay output.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or component referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used merely to distinguish one element from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Example 1

A commercial ultra-convenience store refrigeration equipment IoT centralized monitoring system based on LoRa wireless communication technology comprises three parts, namely refrigeration equipment 1 with end concept and a terminal controller 2 connected with the refrigeration equipment 1, wherein the terminal controller 2 is used for acquisition control; the system comprises an LoRa wireless communication module 3 with the concept of 'side' and an industrial internet of things gateway 4, wherein the LoRa wireless communication module 3 is connected between a terminal controller 2 and the industrial internet of things gateway 4; the industrial internet platform 5 with the cloud concept is in communication connection with the industrial internet platform 5 and the industrial internet-of-things gateway 4. The industrial internet of things gateway 4 also supports communication connection and display with the configuration touch screen 6.

In the above embodiment, the terminal controller 2 collects data of the refrigeration equipment 1 of the store-and-store convenience store, and is connected with the industrial internet of things gateway 4 through the LoRa wireless communication module 3, and the industrial internet of things gateway 4 performs data processing and storage on the transmitted data, and transmits the local data to the configuration touch screen 6 connected to one side of the industrial internet of things gateway 4, and simultaneously transmits the data information to the industrial internet platform 5.

As shown in fig. 1, the refrigeration device IoT centralized monitoring system includes an end device layer, an edge control layer, and a cloud platform layer, the refrigeration device 1 in the store-and-store convenience store is a source of all data, and all subsequent operations such as control, query, management, and maintenance are also based on the operation data and real-time status provided by the refrigeration device 1, so the refrigeration device 1 in the store-and-store convenience store IoT centralized monitoring system is the bottom layer of the concept of "end" technology. The upper layer in the concept of "end" is the terminal controller 2, which is also an important link for connecting "end" and "edge". The terminal controller 2 mainly undertakes the data acquisition and bottom layer control part in the system architecture, acquires data provided by the refrigeration equipment 1 in the store-and-store convenience store, and performs corresponding control functions according to the mutual cooperation of internal control logic and control instructions issued by the upper layer.

As shown in fig. 2, the terminal controller 2 includes a freezer controller and a freezer controller, the freezer controller is correspondingly connected to the freezer in the refrigeration equipment 1, and the freezer controller is correspondingly connected to the freezer in the refrigeration equipment 1.

The overall layout connection relationship of the refrigerator controller is shown in fig. 3, and the refrigerator controller comprises an MCU (microprogrammed control unit) 7, and an analog quantity input unit 8, a digital quantity input unit 10, an analog quantity output unit 9, a digital quantity output unit 11, an electronic expansion valve output unit 12, a dimming output unit 13, an RS485 communication bus interface a14, an RS485 communication bus interface b15, a switching power supply and a system power supply 18 which are respectively connected with the MCU 7;

the switch power supply comprises an external AC220V voltage input end 16 and a transformer 17 which are connected, and the input voltage AC220V is converted into AC24V through the external linear power transformer 17 to supply power to the cold cabinet controller circuit board;

system power supply 18 part: AC24V AC voltage is input to a circuit board, is connected to a 2-path DC-DC switching power supply chip after full-bridge rectification and filtering, and the DC-DC switching power supply chip outputs DC12V and DC5V voltages respectively. The DC12V voltage supplies power to the relay, the analog quantity output and the analog quantity input part. The DC5V voltage supplies power for the interface chip, the emitter of the PNP triode, the pull-up resistor, the display screen interface and the like. The DC5V voltage is generated into DC3.3V voltage through a forward low-voltage drop voltage stabilizer AMS1117-3.3V and is supplied to an MCU (microprogrammed control unit) 7, an RS485 communication part and the like;

analog input section 8: the analog input unit 8 adopts a 12-bit ADC in the MCU 7 to acquire an input signal; the temperature analog quantity input part comprises 6 paths of temperature analog quantity input parts, wherein the temperature analog quantity input parts can detect the temperature input of a temperature sensor PT1000(2 lines)/a thermistor temperature sensor NTC5K and the 1 path of voltage DC 0-10V input, and can acquire pressure sensor signals;

analog quantity output unit 9: the analog quantity output unit 9 selects an output mode by switching a 0 omega resistor on a circuit board in a mode of 12-bit DAC or Pulse Width Modulation (PWM) in the MCU micro control unit 7; the circuit comprises 1 path of analog quantity output channel, can output 0-10V signals or 4-20mA signals, selects output types through software setting, and selects current or voltage output through a wiring terminal;

the digital quantity input unit 10 includes: the 3-path AC220V switching value input channel adopts a photoelectric coupler to isolate strong and weak current and then signals are accessed to the MCU 7; 2, the input interface is subjected to interference elimination by magnetic beads and then is subjected to pull-up resistance to DC5V voltage by a single-phase conducting diode connector 470R;

electronic expansion valve output unit 12: including a voltage pulse type electronic expansion valve and a PWM type electronic expansion valve. The voltage pulse type electronic expansion valve is controlled by an output signal of the MCU micro control unit 7, and the output signal is transmitted to an output interface after passing through an ULN2003 driving chip and capacitor decoupling. The PWM type electronic expansion valve is characterized in that the MCU micro control unit 7 outputs a PWM control signal to drive the optocoupler to control the bidirectional thyristor to output an alternating current control signal;

the MCU 7 adopts an STM32 processor STM32F103VCT6 of an intention Semiconductor (ST) company as a main control chip, configures a real-time clock module and adopts a special chip with the model of PCF8563 to finish the running and the keeping of time, communicates with an STM32F103VCT6 by adopting an IIC (I2C) bus, and configures an external memory EEPROM (electrically erasable programmable read-only memory) and 24C32 for recording and storing data;

the digital quantity output unit 11 includes: 8 paths of independent relay output channels and 2 paths of relay output channels sharing a common terminal, wherein 9 paths of 10 paths of relay outputs are in a single-pole single-throw mode, and 1 path of the 10 paths of relay outputs is in a single-pole double-throw mode; 4 paths of transistor outputs can drive the electronic expansion valve (in an excitation driving mode), and 1 path of transistor outputs can drive an akv (220VAC) electronic expansion valve;

dimming output unit 13: the output of the Darlington transistor is adopted, and the electronic ballast is matched, so that the brightness of lamp light can be adjusted;

2 RS485 communication bus interface, because of the interference killing feature is strong, can carry out long distance data transmission. The two interfaces can be respectively used for connecting an upper computer and a human-computer interface (HMI), and the other two interfaces are provided with red and green LEDs for indicating the communication state of the system, so that the communication fault is conveniently searched.

As shown in fig. 4, the main elements of the refrigerator controller include: the device comprises an operational amplifier 19, an analog IC20, a debugging interface 21, a microcontroller 22(MCU), a lithium battery 23, a buzzer 24, an electrolytic capacitor 25, an inductor 26, a power supply IC27, a rectifier bridge 28, a transient suppression diode 29(TWS), a glass discharge tube 30, a piezoresistor 31, an optical coupler 32, a controllable silicon 33, a safety capacitor 34, a relay 35, a communication interface board plug-in type 36, a communication interface chip 37 and a fuse 38; as shown in fig. 5, the refrigerator controller port includes: a pressure input a39, a temperature input a40, a dimming output 41, a transformer secondary 42, a fan output 43, a transformer primary 44, a power input 45, an AKV electronic expansion valve 46, an alarm output 47, an outside lighting/inside lighting 48, a defrost synchronization 49, a heating output/cooling output 50, a non-cooling output 51, a backup relay output 52, a remote switch 53, a communication signal 54, a DC12V solid state relay 55, a supervisory computer 56, a backup 485 communication 57, a display 58, an upper computer/cascade/RS 485 communication interface a59, an electronic expansion valve 60, and an analog output 61;

the application program of the refrigerator controller is stored in the main control chip of the STM32F103VCT6, and the refrigerator controller needs a 220V power supply to supply power when working. The upper computer can read the parameter set value and the acquisition value of the register address in the refrigerator controller through the RS485 communication bus interface, judge whether the set parameter is correct and the like, and meanwhile, the RS485 communication bus interface also has a cascade mode, so that the simultaneous connection of multiple units can be realized. The cold cabinet controller can collect parameters such as temperature parameters, pressure parameters, fan start and stop, electronic expansion valve start and stop and the like, and control connected refrigeration equipment, thereby realizing the purpose of energy conservation. A spare 485 communication port is also reserved in the refrigerator controller, and sufficient preparation is made for ensuring the communication function of the refrigerator controller.

It should be noted that the freezer controller with the above structure is mainly used for controlling display freezers, and as an optimal choice in this embodiment, on the premise of ensuring enough control points, the volume, the wiring terminals and the like are compatible with the thermostatic expansion valve controller, and meanwhile, the product cost is effectively controlled; comparing all functions, the structure appearance, the input and output points and performance index, the communication interface performance, the usability and other aspects all reach the advanced level in the industry. However, the refrigerator controller with the structure is not the only choice of the embodiment, and other known types of controllers with the acquisition control function can be the choice of the embodiment.

The refrigeration house controller comprises an MCU integrated on the acquisition board, and a digital signal input circuit, a digital signal output circuit, an analog quantity input circuit, an analog quantity output circuit and a communication circuit which are respectively connected with the MCU; the power supply is connected with the MCU, the digital signal input circuit, the digital signal output circuit, the analog quantity input circuit, the analog quantity output circuit and the communication circuit to supply power for the MCU, the digital signal input circuit, the digital signal output circuit, the analog quantity input circuit, the analog quantity output circuit and the communication circuit.

Power supply: the switching power supply realizes the conversion of a power supply part from AC220V to DC12V by applying a switching power supply chip of TOP242-GN, and a DC12V power supply is used for supplying power to a relay, an ULN2003, a stepping electronic expansion valve, a pressure sensor, an operational amplifier during analog quantity output, an LM2575 switching voltage-stabilizing integrated circuit and a 485 communication port peripheral equipment where CN9 is located; the conversion from 12V to 5V is realized by LM2575, and the 5V voltage output is used for supplying power to an AMS1117 voltage stabilizer, a pressure sensor, a reserved 4G module, a 485 communication port and an AD8628AIDBZR precision operational amplifier; the conversion from 5V to 3.3V is realized by AMS1117, and 3.3V is used for supplying power for an MCU chip, a 485 chip, some pull-up, a REF3025 reference voltage source and the like;

MCU: the application is GD32F103VET6 which is easy to innovate, the programming mode is SWD, 0.1uF chip decoupling capacitor, power-off clock keeping, U7 EEPROM, three KEYs KEY1 KEY2 KEY3, shift register and 3-bit nixie tube use;

digital signal input circuit: the pin state of the MCU chip is stabilized by pulling up the pins of the MCU chip through the resistors R57-R64, and the pin state of the MCU chip is changed when the external equipment is grounded (the ground of the controller);

the digital signal output circuit drives 8 relays by applying a 7-in 7-out ULN2003 chip, electric shock of the relays is matched with resistance-capacitance absorption between a zero line and a live line, and corresponding light emitting diodes can be lightened when the relays are conducted; another 3 ways of T410-600B bidirectional controllable silicon are output, and the controllable silicon is controlled through MOC3062 isolation drive;

analog input circuit: the temperature control circuit is divided into two parts, one part is a sensor type with the temperature NTC5K, a voltage division circuit with 8-path temperature is respectively realized through resistors R73-R80, and the MCU judges the corresponding temperature value through voltage; the other part is a circuit applied to the pressure sensor, the sensor is divided into a voltage type and a current type, a pin in the middle of a cold storage controller acquisition board socket CN1-CN3 is used as an analog quantity signal input, and finally the analog quantity signal is given to the MCU chip in a voltage mode and is judged through voltage.

Analog quantity output circuit: giving a signal through a DA pin of the MCU, realizing 4-20mA and 0-10V through an LM358 operational amplifier, controlling two paths of stepping electronic expansion valves, driving by applying an ULN2003 chip, and outputting a PWM signal;

the communication circuit adopts an SP3485EN-L/TR chip with the bit number of U19-U21, and a 4G module plug interface for IOT is reserved.

As shown in fig. 7, the freezer controller main components include: the device comprises an MCU chip 62, a 220V power supply 63, an electric fuse 64, a JTAG programming port 65, a phase sequence detection part 66, an upper computer/cascade/RS 485 communication interface b67, a frequency converter RS485 communication interface 68, an analog quantity input 69, a switching quantity input 70, an antenna connector 71, an IOT extension socket 72, a temperature input b73, a pressure input b74, a progressive electronic expansion valve 75, a nixie tube 76, a key switch 77, an LED indicator lamp 78, a 7A resistance-capacitance discharge 79, a relay output 80 and an SSR relay output 81.

The application program of the refrigeration house controller is stored in the MCU chip, and the refrigeration house controller needs a 220V power supply when working. The electric fuse beside the power supply ensures that the freezer controller prevents the freezer controller from burning out due to abnormal voltage under the power-on condition. The program is programmed into the MCU chip through the JTAG programming port, and the electric energy consumption and the electric quantity statistics of the refrigeration equipment connected with the recordable refrigeration house controller are detected through the phase sequence, so that data basis and energy-saving effect judgment are provided for the control of the energy-saving algorithm. The upper computer can read the parameter set value and the acquisition value of each address of the register in the refrigeration house controller through the RS485 communication interface, and judge whether the set parameter is correct, and the RS485 communication interface also has a cascade mode, so that a plurality of units can be connected simultaneously, and the RS485 communication interface of the frequency converter is mainly used for connecting the frequency converter, so that the refrigeration house controller has a frequency conversion function and is prepared for realizing energy-saving control. The refrigeration house controller controls the connected refrigeration equipment by acquiring parameters such as temperature parameters, pressure parameters, starting and stopping of a fan, a compressor and the like, so that the aim of energy conservation is fulfilled. IOT extension version socket can be when freezer controller needs independent networking, and it can be networking to connect the 4G module. Three key switches are provided, and are respectively confirmation keys; upper bond-additional bond; down key-decrease key. The three keys can control the functions of nixie tube display, indicator light flashing, parameter setting and the like.

The refrigeration house controller with the above structure is mainly used for controlling the refrigeration house, and is the best choice in the present embodiment, however, the refrigeration house controller with the above structure is not the only choice in the present embodiment, and other known types of controllers with the acquisition control function can be used as choices in the present embodiment.

The concept of 'edge' in the system architecture is mainly divided into a LoRa wireless communication module 3 and an industrial Internet of things gateway 4. Therefore, the loRa wireless communication technology is adopted in the super convenience store refrigeration plant IoT centralized monitoring system solution of merchant based on the loRa wireless communication technology, because E95-DTU (400LS22-485) loRa wireless communication module 3 that uses in this framework is the wireless data transmission radio station that has military industry level modulation technique, still compatible multiple transmission mode simultaneously, work is in (470MHz ~ 493MHz) frequency channel (acquiescence 470MHz), the loRa wireless communication module 3 of this embodiment provides transparent RS485 interface, adopt the plastic casing, guide tracked mounting structure, have different voltage input of many money. The LoRa spread spectrum technology can bring longer communication distance and has the advantage of strong anti-interference capability. The LoRa wireless communication module 3, as a communication medium, has a certain application range as optical fiber, microwave, and open wire: the real-time and reliable data transmission of monitoring signals in a private network under certain special conditions is provided, the real-time and reliable data transmission system has the characteristics of low cost, convenience in installation and maintenance, strong diffraction capability, flexible networking structure and long coverage range, is suitable for occasions with a plurality of points, dispersion, complex geographic environment and the like, and can be connected with data terminals such as a PLC (programmable logic controller), an RTU (remote terminal unit), a rain gauge, a liquid level meter and the like, so that the connection terminal controller is more stable and reliable.

In summary, the LoRa wireless communication portion in the architecture adopts the E95-DTU (400LS22-485) LoRa wireless communication module 3, the nationally allowed LoRa frequency band is 470-510MHz, and 470-493MHz is the optional communication frequency band, so as to meet the field communication requirement. The partial difficult scheduling problem of multi-terminal controller transmission data of main for solving on-the-spot many of loRa wireless communication, the on-the-spot freezer product of the super convenience store of general merchant or controller all can appear distributing too dispersedly, do not good management and control, inconvenient wired connection that uses. Therefore, reliable wireless network data transmission is the main problem to be solved urgently in the framework, and through repeated technical study, the E95-DTU (400LS22-485) LoRa wireless communication module 3 is finally adopted because the module adopts the latest LoRa technology, so that the distance is farther and the performance is stronger than that of the traditional LoRa data transmission radio station; the data encryption function is provided, and the packet length can be set by engineers or other technicians; the LBT function is supported, the radio station automatically waits for sending according to the current environment noise intensity, and the communication success rate of the radio station in the severe environment is greatly improved.

As shown in fig. 8, the parts of the external view of the LoRa wireless communication module are described as follows:

serial number	Name (R)	Function(s)	Description of the invention
				a	Mode	Mode switching button	Operating mode switching control
b	ANT	Radio frequency interface	SMA-K, external screw thread inner hole
				c	AC	Power supply interface	AC power input port, wire-pressed endPort AC85-265V
d	RS485	RS485 communication port	Standard RS485 interface
				e	PWR	Power indicator lamp	Turned on when power is turned on
f	TXD	Sending indicator light	Blink while sending data
				g	RXD	Receiving indicator light	Flash while receiving data
h	MO	Mode indicating lamp	Working mode indicator lamp
				i	M1	Mode indicating lamp	Working mode indicator lamp

The general specification parameters of the E95-DTU (400LS22-485) LoRa wireless communication module are as follows:

serial number	Item	Specification of	Description of the invention
				1	Size of the product	926630mm	Detailed mounting dimensions
2	Product weight	95g	Weight tolerance 5g
				3	Operating temperature	-40℃～+85℃	Industrial grade
4	Voltage range	85～265V(AC)	AC110V/220V can all
				5	Communication interface	RS485	RS485
6	Baud rate	Factory default 9600	The Baud rate ranges from 1200 to 115200
				7	Address code	Factory default 0	65536 total address codes can be set

The E95-DTU (400LS22-485) LoRa wireless communication modules all have four working modes, and when no harsh low-power consumption requirement exists, if normal communication is needed, the radio station is recommended to be configured into a transparent transmission mode (mode 0); the default setting is the transparent transmission mode (mode) when the radio station leaves the factory

Formula 0).

Note: if there is no low power consumption requirement, WOR mode (mode 1) need not be a concern.

The industrial internet of things gateway 4 is used as an upper layer of the edge, and is an important core of the edge, and the industrial internet of things gateway 4 is used as a core of data acquisition control and also takes on functions of data forwarding and data storage. In the LoRa wireless communication technology-based refrigerating equipment IoT centralized monitoring system solution for the supermarket/store-ready, the preferred model of the industrial internet of things gateway 4 is as follows: FCU1104 industry thing allies oneself with gateway, key parts explain:

the FCU1104 industrial Internet of things gateway adopts a NXP i.MX6ULL processor development design, has the advantages of ultra-high efficiency, high performance, low cost and the like, has a master frequency as high as 792 Mhz, and supports a 256MB/256MB industrial core board and a 512MB/4GB expansion business-level core board. The FCU1104 industrial Internet of things gateway defaults to two configurations of a basic version and an extended version, wherein the basic version integrates functional interfaces such as Ethernet, 4G, WiFi, LoRa, RS485 and the like, and the extended version additionally CAN extend RS485, RS232, CAN and DI/DO interfaces; the functions of 4G, WiFi, LoRa and the like adopt modular design, and the configuration of the client function is more flexible.

The application program built in the industrial internet of things gateway 4 mainly comprises three parts, namely a data acquisition part, an energy-saving algorithm part and a platform docking part. The data acquisition part is mainly used for acquiring data of the refrigeration equipment 1 connected with the terminal controller 2, and cleaning, converting, storing and encrypting the acquired data. The energy-saving algorithm part is mainly based on the data acquisition part, feeds back a processing result to the refrigeration equipment 1 connected with the terminal controller 2 through data and logic control, and simultaneously sends the processing result to the platform butt joint part. The platform docking part is mainly used for upper layer connection control of a program, and data communication is mainly carried out through an OPC UA protocol when data interaction is carried out with the data acquisition part.

The data acquisition part plays a role of an intermediate platform in the framework, is connected with the terminal controller 2 at the lower end, and simultaneously communicates with other programs and external connection equipment such as a configuration touch screen 6 and the like. The data acquisition part is compatible with a Modbus RTU protocol, a Modbus TCP protocol and an OPC UA protocol. The support of various protocols effectively ensures that the data acquisition part is not influenced when communicating with each link and module. The data acquisition part is also provided with a network management function, can support a common SIM card, namely a PCIE interface remote EC200S (Cat.1 without GPS and voice functions), has a 4G module network system comprising China Mobile 4G/3G/2G, China Unicom 4G/3G/2G and China telecom 4G, and can read a real-time signal value according to the field network condition. The multi-path parallel function of the data acquisition part can process data information on a plurality of links at the same time, thereby greatly improving the acquisition efficiency and effectively reducing the investment cost.

The energy-saving algorithm part mainly takes real equipment provided by the data acquisition part as basic data and takes related parameters and logic judgment preset in the program as basis, such as condensation degree, suction pressure, exhaust pressure, door state, lamp state and the like set in the program. And feeding back the processing result to the refrigeration equipment 1 connected with the terminal controller 2 by comparing the numerical value information of the set parameter with the state of the related parameter, thereby reducing the energy consumption of the refrigeration equipment 1 connected with one side of the terminal controller. The result of the related logic control is also fed back to the platform docking part, so that both data information and result records have historical basis and can be inquired, and true and reliable basis and preparation are provided for later improvement and adjustment. Therefore, in structural view, the energy-saving algorithm part plays a role in starting and stopping the data acquisition part and the platform butting part, also has a logic control function and is a control action of the power consumption reduction part. The power consumption is reduced, meanwhile, the energy conservation and emission reduction of the refrigeration equipment are greatly contributed, convenience is provided for managers of business overload, the working efficiency is greatly improved, the personnel management investment is reduced, and the benign development of the business overload is promoted.

The platform docking part is mainly used for upper layer connection control of a program, and data communication is mainly carried out through an OPC UA protocol when data interaction is carried out with the data acquisition part. The platform docking part mainly serves as an OPC UA client in communication, asks for data to be stored from the data acquisition part and forwards the data to the industrial internet platform 5, so that the platform docking part is a special interface function between the industrial internet platform 5 and an IoT centralized monitoring system of the commercial super refrigeration equipment. The platform docking part is internally compatible with OPC UA protocol and is mainly used for requesting data; the MQTT protocol is externally compatible and is mainly used for forwarding data to an upper industrial Internet platform 5.

The cloud concept in the system architecture refers to a monitoring part of the industrial internet platform 5, and is mainly used for upper-layer application control and data display. The manager and the user of the store-and-store can log in through the mobile phone client and the computer client, wherein the computer client is allocated with a fixed IP address, the manager can log in the own exclusive account after visiting, check the operation condition of the equipment under the account, and perform corresponding configuration and management according to the field requirement.

The architecture core of the refrigerating equipment IoT centralized monitoring system solution of the super convenience store in business of the LoRa wireless communication technology is cloud, edge and end. The data of the refrigeration equipment 1 is the source of all subsequent processes, and all operations such as control, query, management, maintenance and the like are also based on the operation data and the real-time state provided by the refrigeration equipment 1. The terminal controller 2 is also an important link for connecting the terminal and the side, bears the data acquisition and bottom layer control part, acquires the data provided by the refrigeration equipment 1 in the super-convenience store, and is matched with the control instruction issued by the upper layer according to the internal control logic to execute the corresponding control function. The 'edge' mainly comprises an LoRa wireless communication part and an industrial Internet of things gateway 4 part. In the structure, an E95-DTU (400LS22-485) LoRa wireless communication module 3 is adopted in the LoRa wireless communication part, the 470-493MHz frequency band can be selected by the module, the field communication requirement is met, and the problems that a field multi-terminal controller 2 is inconvenient to use wired connection and data transmission is difficult due to over-dispersed distribution and poor control are solved. The industrial internet of things gateway 4 is the core brain of the side, and the industrial internet of things gateway 4 is used as the core of data acquisition control and also plays a role in data forwarding and data storage. The data acquisition part, the energy-saving algorithm part and the platform butt joint part of the industrial internet of things gateway 4 are matched with each other, and play an important role in starting and ending in the architecture. The cloud concept in the system architecture refers to the monitoring part of the industrial internet platform 5, and is mainly used for application control and data display of the upper layer. A manager can remotely check and browse real-time information, historical data, equipment states and the like of the refrigeration equipment, and can remotely control the refrigeration equipment on site, so that the personnel investment and management of the store-type super convenience store are greatly reduced.

In conclusion, the LoRa wireless communication provided by the system solution optimizes the problems that refrigeration equipment is too dispersed, the size is large, and data cannot be collected and managed; the data summarization can effectively retain, protect and utilize data information of the supermarket store, so that refrigeration equipment of the supermarket store can correspondingly adjust and control energy conservation according to the real-time state of the refrigeration equipment, and therefore the purposes of reducing power consumption and reducing cost can be achieved; after data are summarized, individuation of refrigeration equipment of the store-and-store convenience store is reduced, detail difference of operation conditions of each piece of equipment is weakened, and the refrigeration equipment effectively shows individual value and overall value; the framework improves the problems of complexity and slow response of the traditional management, and realizes group control and analysis of the store-and-store; the intelligent management of the refrigeration equipment of the supermarket store-convenient is not enough by the functions of remote management, history retrieval, data analysis, remote control and the like, the labor investment is effectively reduced, and the efficiency is greatly improved.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. An IoT centralized monitoring system for refrigeration equipment is characterized by comprising an end equipment layer, an edge control layer and a cloud platform layer; the terminal equipment layer comprises refrigeration equipment (1) and a terminal controller (2) connected with the refrigeration equipment (1); the edge control layer comprises an LoRa wireless communication module (3) and an industrial Internet of things gateway (4), wherein the LoRa wireless communication module (3) is connected between the terminal controller (2) and the industrial Internet of things gateway (4); the cloud platform layer comprises an industrial internet platform (5), and the industrial internet platform (5) is in communication connection with the industrial internet of things gateway (4).

2. The IoT centralized monitoring system for the refrigeration equipment as claimed in claim 1, wherein the industrial Internet of things gateway (4) is further connected with a configuration touch screen (6) in a communication manner.

3. The IoT centralized monitoring system for the refrigeration equipment is characterized in that the terminal controller (2) comprises a refrigerator controller and a refrigeration house controller, the refrigerator controller is correspondingly connected with a refrigerator in the refrigeration equipment (1), and the refrigeration house controller is correspondingly connected with the refrigeration house in the refrigeration equipment (1).

4. The IoT centralized monitoring system of the refrigeration equipment is characterized in that the refrigerator controller comprises an MCU micro control unit (7), and an analog input unit (8), a digital input unit (10), an analog output unit (9), a digital output unit (11), an electronic expansion valve output unit (12), a dimming output unit (13) and a communication unit which are respectively connected with the MCU micro control unit (7), wherein the communication unit comprises an RS485 communication bus interface a (14) and an RS485 communication bus interface b (15);

the power supply also comprises a switching power supply and a system power supply (18), wherein the switching power supply comprises an external AC220V voltage input end (16) and a transformer (17) which are connected, the transformer (17) is connected with the system power supply (18), and the system power supply (18) is connected with the units for supplying power.

5. A refrigeration equipment IoT centralized monitoring system according to claim 4, characterized in that the MCU micro control unit (7) adopts STM32 processor as master control chip, the STM32 processor is connected with real-time clock module and external memory.

6. The IoT centralized monitoring system for the refrigeration equipment is characterized in that the analog input unit (8) adopts an ADC module inside the MCU micro control unit (7), and the analog output unit (9) adopts a DAC module or PWM output inside the MCU micro control unit (7);

the digital quantity input unit (10) comprises a switching value input module and a dry node input module, and the switching value input module is connected with the MCU (7) through a photoelectric coupler; the dry node input module is connected with a magnetic bead, the magnetic bead is connected with a single-phase conduction diode, the single-phase conduction diode is connected with an upper pull resistor, and the upper pull resistor is connected with a system power supply (18); the digital quantity output unit (11) comprises a relay output module and a transistor output module.

7. A refrigeration equipment IoT centralized monitoring system as in claim 5, characterized by that, the electronic expansion valve output unit (12) comprises a voltage pulse type electronic expansion valve and a PWM type electronic expansion valve; the voltage pulse type electronic expansion valve is connected with a capacitor, the capacitor is connected with an ULN2003 driving chip, and the ULN2003 driving chip is connected with an MCU (microprogrammed control unit) (7); the PWM type electronic expansion valve is connected with a bidirectional thyristor, the bidirectional thyristor is connected with an optocoupler, and the optocoupler is connected with an MCU (microprogrammed control unit) (7).

8. A refrigeration device IoT centralized monitoring system as set forth in claim 5 characterized in that the dimming output unit (13) comprises a Darlington transistor connected to an electronic ballast.

9. The IoT centralized monitoring system for the refrigeration equipment as claimed in claim 3, wherein the refrigeration storage controller comprises an MCU integrated on the acquisition board, and a digital signal input circuit, a digital signal output circuit, an analog input circuit, an analog output circuit and a communication circuit which are respectively connected with the MCU; the power supply is connected with the MCU, the digital signal input circuit, the digital signal output circuit, the analog quantity input circuit, the analog quantity output circuit and the communication circuit to supply power for the MCU, the digital signal input circuit, the digital signal output circuit, the analog quantity input circuit, the analog quantity output circuit and the communication circuit.

10. The IoT centralized monitoring system for the refrigeration equipment as claimed in claim 9, wherein the MCU employs a GD32F103VET6 chip, and the digital signal input circuit comprises several pull-up resistors; the digital signal output circuit comprises a relay, the relay is connected with the MCU through an ULN2003 chip, and the digital signal output circuit also comprises a bidirectional thyristor, and the bidirectional thyristor is connected with the MCU through a bidirectional thyristor driver; the analog quantity input circuit comprises two parts, wherein one part is a circuit applied to the temperature sensor and is respectively used as a voltage division circuit of 8 paths of temperature through eight resistors, the other part is a circuit applied to the pressure sensor, and a pin in the middle of a cold storage controller acquisition board socket CN1-CN3 is used as an analog quantity signal input end and is connected with the MCU; the analog output circuit comprises an operational amplifier and a PWM signal output module which are respectively connected with the MCU, and also comprises two paths of stepping electronic expansion valves, wherein the stepping electronic expansion valves are connected with the MCU through an ULN2003 chip; the communication circuit adopts an SP3485EN-L/TR chip.