Wireless transmission system for underground pipe gallery

Abstract

The invention belongs to the technical field of nuclear power, and particularly relates to an underground pipe gallery wireless transmission system. The underground pipe gallery wireless transmission system disclosed by the invention is in a linear configuration, considers the structural characteristics of the underground pipe gallery environment and intelligent construction requirements, balances engineering construction and performance requirements, integrates radio frequency and Ethernet network technologies, and starts from the directions of power supply and an upper connecting channel (to a server) through a data and power supply simultaneous transmission technology; the wireless coverage difficulty in the pipe gallery environment is simplified, the traditional star-shaped networking mode of network switches and AP base stations is broken through, the serial networking mode of main base stations and branch base stations is innovated, extension is convenient, wiring is simple, power supply and data transmission of remote equipment can be achieved through one cable, extension networking can be conducted according to needs, and the cost is reduced. In order to adapt to the environmental characteristics and implementation requirements of the nuclear power long underground pipe gallery, a wireless coverage scheme more suitable for a linear plant is provided for the industry.

Description

Technical Field

[0001] The present invention belongs to the field of nuclear power technology, and specifically relates to an underground pipe gallery wireless transmission system. Background Art

[0002] Underground pipeline corridors are an important part of nuclear power plants. The control linkage signals, power supply cables, cooling water and thermal water between nuclear power plant buildings are all connected and operated through underground pipeline corridors.

[0003] The underground pipe gallery of the nuclear power plant is located below the ground, linearly running through all the plant buildings of the entire unit, crisscrossing. At present, there is no wireless communication means in the underground pipe gallery of the nuclear power plant. After the staff enters the underground pipe gallery, the outside world cannot get in touch with them immediately, and the equipment in the underground pipe gallery also lacks real-time monitoring means.

[0004] The communication needs of the underground corridors of nuclear power plants include audio / video calls, data transmission, personnel positioning, sensor access, and access and use of various communication terminals. Therefore, wireless access and high-bandwidth communication systems are required. At present, traditional wireless communication solutions basically adopt the deployment mode of network switches + base stations. Due to the limitation of transmission media, the transmission distance is short (such as the network cable needs to be within 100 meters) or multiple transmission media need to be deployed. The underground corridors are distributed linearly, and it is difficult to lay cables and obtain electricity in the corridors. Therefore, it is urgent to effectively solve the communication problems of underground corridors in nuclear power plants. Summary of the invention

[0005] In order to overcome the problems existing in the related technologies, an underground pipe gallery wireless transmission system is provided, which includes: a maintenance terminal, an integrated management platform, a network switch, a main base station and multiple sub-base stations; the main base station and multiple sub-base stations all have WiFi wireless access capabilities;

[0006] The maintenance terminal and the integrated management platform are connected to the network switch respectively; the network switch is connected to the main base station; the main base station is provided with multiple downlink ports, each of which is connected in series with multiple sub-base stations. The main base station is used to supply power to all sub-base stations and also to realize the data aggregation and upload function;

[0007] Each sub-base station is provided with an uplink port and a downlink port. The uplink port is used for data transmission and power input with an upper-level main base station or an upper-level sub-base station, and the downlink port is used for data transmission and power output with a lower-level sub-base station.

[0008] In a possible implementation, the main base station includes a first main module, a plurality of submodules, a plurality of power supply & signal coupling / separation circuits and a power supply module;

[0009] The main module is used to connect an external antenna to achieve WiFi wireless coverage in the area around the main base station; each sub-module is connected to the main module for communication. After receiving the datagram output by the main module, each sub-module converts it into a WiFi signal through the WiFi chip set in the sub-module and outputs it to the power supply & signal coupling / separation circuit;

[0010] The power module is an external power supply, used to convert the alternating current of a first voltage value output by the power supply into direct current of a second voltage value to power the main base station, and output it to each power supply & signal coupling / separation circuit;

[0011] The power supply & signal coupling / separation circuit couples the received DC signal with the WiFi signal to form a mixed signal, which is then sent to multiple base stations connected in series in the downlink through the connected downlink port; or the WiFi signal is separated from the mixed signal and sent to the sub-module for processing.

[0012] In a possible implementation, each sub-base station includes a second main module, a left sub-module, a right sub-module, and two power supply & signal coupling / separation circuits;

[0013] The main module is used to connect an external antenna to achieve WiFi wireless coverage in the area around the base station;

[0014] A power & signal coupling / separation circuit of the sub-base station separates the mixed signal received from the connected uplink port into a WiFi signal and a DC signal, the DC signal is used to power the sub-base station and is output to another power & signal coupling / separation circuit of the sub-base station, and the WiFi signal is output to the left sub-module;

[0015] The left submodule parses the received WiFi signal into data packets through the built-in WiFi chip, and after being processed by the switching chip of the main module, the right submodule couples the received DC signal with the WiFi signal to form a mixed signal, which is sent to the downlink serial sub-base station through the connected downlink port;

[0016] In a possible implementation, the main module includes: a WiFi chip, a switch chip, a front-end module circuit, a local management circuit, a memory circuit, a serial port circuit, and a PoE power supply circuit;

[0017] The WiFi chip and the switching chip work together to receive WiFi signals, forward uplink / downlink data, and provide data exchange and routing functions.

[0018] Front-end module circuit, used to provide transmission amplification and reception amplification, filtering, power detection, control and switching functions of RF signals;

[0019] The local management circuit is used to manage various circuits of the installed main base station or sub-base station, including working status, watchdog, equipment monitoring, power supply management, port management, and equipment configuration;

[0020] Memory circuit, a storage circuit supporting the operation of the WiFi chip;

[0021] Serial port circuit: provides input / output interface circuit for configuration and debugging of installed main base station or sub-base station equipment;

[0022] The PoE power supply circuit is used to provide PoE power supply and data access capabilities.

[0023] In one possible implementation, the main base station and each sub-base station can provide two external antennas to complete 2.4G WiFi and 5G WiFi coverage.

[0024] In one possible implementation, the main base station uses AC power and optical fiber as power supply and uplink data channels; coaxial cables are used as power supply and data transmission physical media between the main base station and the sub-base stations and between the sub-base stations; the WiFi signal transmitted in the coaxial cable is a data signal in the 5G frequency band.

[0025] In one possible implementation, the power & signal coupling / separation circuit is used to couple or separate the DC power supply with the 5G WiFi signal; and to shield and filter non-5G WiFi signals.

[0026] In one possible implementation, the redundant computing power and Ethernet data processing capabilities within the main base station and each base station can provide functions such as wired communication while providing broadband wireless coverage.

[0027] The beneficial effects of the present disclosure are as follows: the underground pipe gallery wireless transmission system of the present disclosure is a linear configuration, which takes into account the structural characteristics of the underground pipe gallery environment and the needs of intelligent construction, balances the engineering construction and performance requirements, integrates radio frequency and Ethernet network technology, and uses data and power supply simultaneous transmission technology. Starting from the power supply and upstream connection channel (to the server), it simplifies the difficulty of wireless coverage in the pipe gallery environment, breaks through the star networking mode of traditional network switches + AP base stations, and innovates the main base station + sub-base station serial networking mode, which is convenient for extension and simple wiring. One cable can be used to realize power supply and data transmission of remote equipment, and the network can be extended as needed to adapt to the environmental characteristics and implementation requirements of the long underground pipe gallery of nuclear power plants, and provide the industry with a wireless coverage solution that is more suitable for linear factories.

[0028] The disclosed system saves equipment investment and construction costs. Compared with the traditional method, one main base station can replace multiple network switches, saving equipment investment. In the underground pipe gallery environment, wiring and power supply are relatively difficult. The system saves the construction of cables such as network cables, power cables, and optical cables, greatly saving construction costs. In addition, the system has a small number of devices and simple connections, which reduces system failure points and reduces the workload of system operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a block diagram of an underground pipe gallery wireless transmission system according to an exemplary embodiment.

[0030] Figure 2 It is a block diagram of a master base station according to an exemplary embodiment.

[0031] Figure 3 It is a block diagram of a sub-base station according to an exemplary embodiment.

[0032] Figure 4 is a block diagram of a power supply & signal coupling / separation circuit according to an exemplary embodiment.

[0033] Figure 5 is a block diagram of a main module according to an exemplary embodiment.

[0034] Figure 6 is a block diagram of a left submodule or a right submodule according to an exemplary embodiment. DETAILED DESCRIPTION

[0035] The present disclosure is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Figure 1 is a block diagram of an underground pipe gallery wireless transmission system according to an exemplary embodiment. Figure 1 As shown, the system includes: a maintenance terminal, an integrated management platform, a network switch, a main base station and multiple sub-base stations; the main base station and multiple sub-base stations all have WiFi wireless access capabilities. The maintenance terminal and the integrated management platform are respectively connected to the network switch; the network switch is connected to the main base station. Among them, the maintenance terminal can be represented as a PC or a laptop computer, which is used by maintenance personnel to log in to the integrated management platform for configuration, query, upgrade and other operations; the integrated management platform can be used to provide unified management of wireless transmission systems, base station management, user management, authority management and other functions.

[0037] The main base station can be provided with two downlink ports, each port is connected to multiple sub-base stations in series via a coaxial cable. The main base station is used to supply power to all sub-base stations and also to realize data aggregation and upload functions. Each sub-base station can be provided with two ports, one port is used for data transmission and power input with the upper main base station or sub-base station, and the other port is used for data transmission and power output with the lower sub-base station. Both the main base station and the sub-base station have the ability to provide 2.4G and 5G WiFi wireless access.

[0038] The main base station uses AC power and optical fiber as power supply and uplink data channel. Coaxial cable is used as power supply and data transmission physical medium between the main base station and sub-base stations, and between sub-base stations; 48V DC is used for power supply, and WiFi protocol is used for data transmission, which is transmitted on coaxial cable through power & signal coupling and separation unit.

[0039] Considering that the network rate of the WiFi protocol in the 5G band is higher than that in the 2.4G band, the WiFi signal that can be transmitted in the coaxial cable is a data signal in the 5G band.

[0040] The sub-base stations can be extended remotely using coaxial cables as needed. The system's power supply and network interface are connected from the main base station and transmitted to each sub-base station through cables to complete the data communication function, solving the problem of network coverage caused by the long distance of power and network interfaces in underground corridors and simplifying construction.

[0041] In one possible implementation, considering factors such as power supply and data transmission delay, one main base station is designed to carry eight sub-base stations. Considering factors such as voltage drop and data signal loss, the coaxial cable length between the main base station and each sub-base station can be 200 meters. Each base station can provide two external antennas to complete 2.4G WiFi and 5G WiFi coverage.

[0042] like Figure 2 As shown, the main base station includes a first main module, multiple sub-modules and a power module; wherein the main module is provided with multiple WiFi radio frequency output ports for external antennas to achieve WiFi wireless coverage in the area surrounding the main base station, and the sub-modules are all provided with WiFi radio frequency output ports for data transmission between the main base station and other main base stations.

[0043] The main base station also includes a power module for converting 220V AC power into 48V DC power to provide power for the main base station and its connected sub-base stations. The power module has a power programmable switch and an overcurrent protection function 1.

[0044] The main base station is equipped with a power supply & signal coupling / separation circuit, which is used to couple the WiFi signal with 48V DC into a mixed signal and then transmit it to multiple branch base stations connected in series downlink through coaxial cables connected to each port; or separate the WiFi signal from the mixed signal and send it to the left submodule or the right submodule for processing.

[0045] like Figure 3 As shown, the sub-base station includes a second main module, a left sub-module and a right sub-module; the second main module is provided with multiple WiFi radio frequency output ports for external antennas to achieve WiFi wireless coverage in the area around the sub-base station, and the left sub-module and the right sub-module are both provided with a 5G WiFi radio frequency signal for data transmission with other main base stations or sub-base stations.

[0046] The sub-base station is equipped with a power & signal coupling / separation circuit, which is used to separate the mixed signal in the coaxial cable into WiFi signal and 48V DC, or to couple the WiFi signal and 48V DC into a mixed signal for transmission in the coaxial cable. In addition to supplying power to the lower-level sub-base station, the separated 48V DC also provides 48V power for this unit.

[0047] See also Figure 4 The power & signal coupling / separation circuit includes capacitors, inductors, and filtering circuits, which are used to couple or separate the 48V DC power supply with the 5G WiFi signal; shield and filter non-5G WiFi signals to avoid affecting data transmission.

[0048] The power & signal coupling / separation circuit is designed and calculated using the characteristics of capacitors blocking DC and passing AC, and the characteristics of inductors passing DC and blocking AC, which can reduce the circuit's impact on 5G signal attenuation and transmission impedance.

[0049] The frequency of 5G WiFi signals is high. When transmitted in the transmission line (microstrip line / strip line) of the printed circuit board, the routing needs to be designed according to the 50-ohm transmission line to avoid signal reflection and attenuation caused by impedance mismatch. The parasitic parameters of conventional capacitors and inductors used in related technologies are large, so high-frequency capacitors and hollow cable inductors with small parasitic parameters need to be selected. In addition, when designing the stacking and impedance of the printed circuit board, the line width, flow rate, transmission line impedance matching, etc. should be considered at the same time.

[0050] like Figure 5 As shown, the main module adopts WiFi chip and switching chip, and is designed with other necessary supporting circuits to realize the local WiFi access function, local main control and data exchange function.

[0051] The WiFi chip has a built-in high-performance processor, power amplifier, low-noise amplifier, filter, transceiver switch, high-speed WiFi module and hardware forwarding engine. Together with other supporting circuit modules, it provides stable 2.4G WiFi and 5G WiFi wireless access and routing forwarding functions.

[0052] The switching chip, under the coordination of the built-in high-performance processor in the WiFi module, cooperates with other supporting circuit modules to provide data exchange and routing functions for the local wireless access data and uplink / downlink forwarding data.

[0053] In addition, in order to realize the above functions, the main module also designs the required supporting circuit modules, and the functions of each supporting circuit module are as follows:

[0054] Front-end module circuit: provides transmission amplification and reception amplification, filtering of RF signals, and even includes power detection, control and switching functions. For WiFi radio frequency, the front-end module is divided into 2.4G and 5G, which are used in 2.4G and 5G frequency bands respectively.

[0055] Local management circuit: various circuits used for local equipment management, including working status, watchdog, equipment monitoring, power supply management, port management, equipment configuration and other supporting circuits.

[0056] Memory circuit: A storage circuit that supports the operation of the WiFi chip.

[0057] Serial port circuit: An interface circuit that provides input / output for local device configuration and debugging.

[0058] PoE power supply circuit: provides PoE power supply and data access capabilities.

[0059] like Figure 6 As shown, the main functions provided by the left submodule and the right submodule are: after receiving the 5G WiFi signal separated by the power & signal coupling / separation circuit, it is parsed into a data packet through the WiFi chip, and the data packet is sent to the switching chip of the main module through the interface for the next step of processing;

[0060] After receiving the datagram from the main module switching chip, it is converted into a 5G WiFi signal through the WiFi chip, and the 5G WiFi signal is then sent to the power & signal coupling / separation circuit for coupling and transmission.

[0061] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An underground pipe gallery wireless transmission system, characterized in that: The system includes: a maintenance terminal, an integrated management platform, a network switch, a main base station and multiple sub-base stations; the main base station and multiple sub-base stations all have WiFi wireless access capabilities; The maintenance terminal and the integrated management platform are connected to the network switch respectively; the network switch is connected to the main base station; the main base station is provided with multiple downlink ports, each of which is connected in series with multiple sub-base stations. The main base station is used to supply power to all sub-base stations and also to realize the data aggregation and upload function; Each sub-base station is provided with an uplink port and a downlink port. The uplink port is used for data transmission and power input with an upper-level main base station or an upper-level sub-base station, and the downlink port is used for data transmission and power output with a lower-level sub-base station.

2. The system according to claim 1, characterized in that The main base station includes a first main module, a plurality of submodules, a plurality of power supply & signal coupling / separation circuits and a power supply module; The main module is used to connect an external antenna to achieve WiFi wireless coverage in the area around the main base station; each sub-module is connected to the main module for communication. After receiving the datagram output by the main module, each sub-module converts it into a WiFi signal through the WiFi chip set in the sub-module and outputs it to the power supply & signal coupling / separation circuit; The power module is an external power supply, used to convert the alternating current of a first voltage value output by the power supply into direct current of a second voltage value to power the main base station, and output it to each power supply & signal coupling / separation circuit; The power supply & signal coupling / separation circuit couples the received DC signal with the WiFi signal to form a mixed signal, which is then sent to multiple base stations connected in series in the downlink through the connected downlink port; or the WiFi signal is separated from the mixed signal and sent to the sub-module for processing.

3. The system according to claim 1, characterized in that Each sub-base station includes a second main module, a left sub-module, a right sub-module and two power supply & signal coupling / separation circuits; The main module is used to connect an external antenna to achieve WiFi wireless coverage in the area around the base station; A power & signal coupling / separation circuit of the sub-base station separates the mixed signal received from the connected uplink port into a WiFi signal and a DC signal, the DC signal is used to power the sub-base station and is output to another power & signal coupling / separation circuit of the sub-base station, and the WiFi signal is output to the left sub-module; The left submodule parses the received WiFi signal into data packets through the built-in WiFi chip. After being processed by the switching chip of the main module, the right submodule couples the received DC signal with the WiFi signal to form a mixed signal, which is sent to the downlink series sub-base station through the connected downlink port.

4. The system according to claim 1, characterized in that The main module includes: WiFi chip, switch chip, front-end module circuit, local management circuit, memory circuit, serial port circuit, PoE power supply circuit; The WiFi chip and the switching chip work together to receive WiFi signals, forward uplink / downlink data, and provide data exchange and routing functions. Front-end module circuit, used to provide transmission amplification and reception amplification, filtering, power detection, control and switching functions of RF signals; The local management circuit is used to manage various circuits of the installed main base station or sub-base station, including working status, watchdog, equipment monitoring, power supply management, port management, and equipment configuration; Memory circuit, a storage circuit supporting the operation of the WiFi chip; Serial port circuit: provides input / output interface circuit for configuration and debugging of installed main base station or sub-base station equipment; The PoE power supply circuit is used to provide PoE power supply and data access capabilities.

5. The system according to claim 1, characterized in that The main base station and each sub-base station can provide 2 external antennas to complete 2.4G WiFi and 5G WiFi coverage.

6. The system according to claim 5, characterized in that The main base station uses AC power and optical fiber as power supply and uplink data channels; coaxial cables are used as physical media for power supply and data transmission between the main base station and the sub-base stations and between each sub-base station; the WiFi signal transmitted in the coaxial cable is a data signal in the 5G frequency band.

7. The system according to claim 3 or 4, characterized in that: The power & signal coupling / separation circuit is used to couple or separate the DC power supply with the 5G WiFi signal; and to shield and filter the non-5G WiFi signals.

8. The system according to claim 1, characterized in that The redundant computing power and Ethernet data processing capabilities within the main base station and each base station can provide functions such as wired communications while providing broadband wireless coverage.

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