Wireless communication grounding system for ultra-high-speed magnetic levitation traffic line of low-vacuum pipeline

Abstract

The invention provides a wireless communication grounding system of a low-vacuum pipeline ultra-high-speed magnetic levitation traffic line. The wireless communication grounding system comprises an in-pipe communication cabinet, a leakage cable, an outdoor communication cabinet and a cable grounding device. A high-pressure connecting device is arranged on the pipeline wall of the metal vacuum pipeline, the high-pressure connecting device is arranged in a reserved interface of the pipeline, a connector which is conducted inside and outside is arranged in a connecting main body, and a first group of feeder lines inside the vacuum pipeline are connected with a second group of feeder lines outside the vacuum pipeline through the high-pressure connecting device; the cable grounding device comprises a lightning arrester and a feeder grounding card, the lightning arrester is connected to a connecting plug in the vacuum pipeline, and a shielding layer of the first group of feeder is connected with a grounding point of the lightning arrester and is connected to a weak current grounding body in the pipeline through a grounding wire of the lightning arrester; and the feeder grounding clamp is connected with a shielding layer of the second group of feeder outside the pipeline, and is connected to a weak current grounding body outside the pipe beam through a grounding clamp grounding wire. According to the invention, safe operation and reliable grounding of the wireless communication system are realized.

Description

Technical Field

[0001] This invention relates to the field of ultra-high-speed low-vacuum pipeline maglev transportation technology, and in particular to a wireless communication grounding system for a low-vacuum pipeline ultra-high-speed maglev transportation line. Background Technology

[0002] The low-vacuum tube ultra-high-speed maglev transportation system uses contactless electromagnetic propulsion to enable vehicles to travel at high speeds within the tube. Unlike traditional wheel-rail transportation, its significant feature is that the power supply system is located on the ground side. Due to the high vehicle speed, the ground power supply voltage is relatively high, and the environment inside the tube is complex, thus placing high demands on the ground-side power supply.

[0003] Grounding describes the electrical connection between certain conductive parts of an electrical device or equipment and the ground. It is an essential measure for maintaining the reliability and stability of system and equipment operation, protecting equipment and personal safety, preventing lightning damage, and suppressing electromagnetic interference. The correctness of grounding plays a crucial role in the safe operation of the system, protecting equipment insulation from abnormal overvoltage damage, and preventing electric shock.

[0004] Wireless communication systems play a crucial role in the safe operation of low-vacuum pipeline ultra-high-speed maglev transportation lines. Therefore, providing a safe and reliable wireless communication grounding system suitable for low-vacuum pipeline ultra-high-speed maglev transportation lines is of great importance to the application of low-vacuum pipeline ultra-high-speed maglev transportation systems. Summary of the Invention

[0005] In view of the above problems, the present invention is proposed to provide a wireless communication grounding system for a low-vacuum pipeline ultra-high-speed maglev transportation line that overcomes or at least partially solves the above problems.

[0006] The wireless communication grounding system for a low-vacuum pipeline ultra-high-speed maglev transportation line provided by the present invention includes an in-pipe communication cabinet, a leaking cable connected to the in-pipe communication cabinet and installed on the inner side wall of the metal vacuum pipeline, an outdoor communication cabinet installed outside the metal vacuum pipeline, and a cable grounding device.

[0007] A high-pressure connection device is installed on the wall of the metal vacuum pipe. The high-pressure connection device includes a connection body and two sets of connection plugs located inside and outside the metal vacuum pipe. The connection body is set in the interface reserved in the vacuum pipe. The connection body includes a connector with internal and external conductivity. The connector is airtightly connected to the two sets of plug assemblies located inside and outside the metal vacuum pipe. The connection plug of the high-pressure connection device located inside the vacuum pipe is connected to the leakage cable through the first set of feeders. The connection plug of the high-pressure connection device located outside the vacuum pipe is connected to the outdoor communication cabinet through the second set of feeders. The connection between the first set of feeders and the second set of feeders is realized through the connector in the connection body. A sealing structure is set at the junction of the high-pressure connection device and the metal vacuum pipe.

[0008] The cable grounding device includes a surge arrester and a feeder grounding clamp. The surge arrester is connected to the connector plug of the high-voltage connection device located inside the vacuum pipeline. The shielding layer of the first set of feeders is connected to the grounding point of the surge arrester and is connected to the weak current grounding body set inside the vacuum pipeline through the grounding wire of the surge arrester. The feeder grounding clamp is connected to the shielding layer of the second set of feeders outside the vacuum pipeline and is connected to the weak current grounding body set outside the pipe beam through the grounding wire of the grounding clamp.

[0009] Optionally, the cable grounding device may also include a DC interrupter for the communication line installed between the leaking cable and the outdoor communication cabinet.

[0010] Optionally, the DC interrupter is connected between the first set of feeders and the leaky cable, or between the second set of feeders and the outdoor communication cabinet.

[0011] Optionally, the leaky cable includes an inner conductor, an insulating dielectric layer, an outer conductor, and a cable protective sheath arranged sequentially from the inside out. The outer surface of the cable protective sheath is provided with an anti-corrosion layer, and several slots are formed on the surface of the outer conductor.

[0012] Optionally, the system also includes an inter-equipment communication cabinet, which is connected to each outdoor communication cabinet via a single-mode 8-core optical cable.

[0013] Optionally, the first set of feeders is connected to the leaky cable via an RF connector.

[0014] Optionally, the feeder length between the leaky cable and the outdoor communication cabinet is less than or equal to 10 meters.

[0015] Optionally, the low-voltage grounding electrode installed inside the vacuum pipe and the low-voltage grounding electrode installed outside the pipe beam are grounding flat steel.

[0016] The wireless communication grounding system for the low-vacuum pipeline ultra-high-speed maglev transportation line provided in this embodiment of the invention adopts lightning protection grounding treatment at the feeder cable of the wireless communication system and sets up corresponding grounding cards, surge protectors and other devices. It can avoid the harm of lightning strikes to RRU equipment and personnel through surge protectors, and after avoiding lightning strikes, the grounding card conducts current through the feeder outside the flange to avoid damage to RRU equipment, thus providing a guarantee for the safe operation and reliable grounding of the wireless communication system.

[0017] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, and in order to make the above and other objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention are described below. Attached Figure Description

[0018] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0019] Figure 1 This is a grounding schematic diagram of the wireless communication grounding system for a low-vacuum pipeline ultra-high-speed maglev transportation line provided in an embodiment of the present invention. Detailed Implementation

[0020] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0021] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0022] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the meaning consistent with their meaning in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined.

[0023] Figure 1 This is a grounding diagram of the wireless communication grounding system for a low-vacuum pipeline ultra-high-speed maglev transportation line provided in an embodiment of the present invention. Figure 1 As shown, in the wireless communication grounding system of the low-vacuum pipeline ultra-high-speed maglev transportation line, one leaky cable is laid at the top and one at the bottom of the pipeline. The wireless communication grounding system for the low-vacuum pipeline ultra-high-speed maglev transportation line provided by the present invention includes an internal communication cabinet, a leaky cable connected to the internal communication cabinet and installed on the inner side wall of the metal vacuum pipeline, an outdoor communication cabinet installed outside the metal vacuum pipeline, and a cable grounding device;

[0024] A high-voltage connection device is installed on the wall of the metal vacuum pipeline. The high-voltage connection device includes a connection body and two sets of connectors located inside and outside the metal vacuum pipeline. The connection body is located within a pre-reserved interface in the vacuum pipeline. The connection body contains connectors with internal and external conductivity. These connectors are airtightly connected to the two sets of connector assemblies located inside and outside the metal vacuum pipeline. The connector inside the high-voltage connection device is connected to a leaky cable via a first set of feeders. The connector outside the high-voltage connection device is connected to an outdoor communication cabinet via a second set of feeders. The connection between the first and second sets of feeders is achieved through the connectors within the connection body. A sealing structure is provided at the junction of the high-voltage connection device and the metal vacuum pipeline. Specifically, the high-voltage connection device is a double-female connector. The connectors of the high-voltage connection device are implemented using a double-female form, used to connect the N-type male connector of the radio frequency cable. Airtightness is ensured between the N-type male connector and the double-female connector through tightening, insulating tape, and vacuum sealant. The connection body has a flange base, and the connector is fixedly connected within the flange base. The dual-female connector RF cable is used to transmit RF signals. The connector serves as an interface adapter at the flange and a RF signal connection point. The main body of the connector is equipped with a flange insert, a high-voltage connection device, and a sealing structure at the junction with the vacuum system.

[0025] The cable grounding device includes a surge arrester and a feeder grounding clamp. The surge arrester is connected to the connector plug of the high-voltage connection device located inside the vacuum pipeline. The shielding layer of the first set of feeders is connected to the grounding point of the surge arrester and is connected to the weak current grounding body set inside the vacuum pipeline through the grounding wire of the surge arrester. The feeder grounding clamp is connected to the shielding layer of the second set of feeders outside the vacuum pipeline and is connected to the weak current grounding body set outside the pipe beam through the grounding wire of the grounding clamp.

[0026] Furthermore, the cable grounding device also includes a DC interrupter for the communication line installed between the leaky cable and the outdoor communication cabinet. Specifically, the DC interrupter is connected between the first set of feeders and the leaky cable, or between the second set of feeders and the outdoor communication cabinet.

[0027] In one specific embodiment, the first set of feeders and the leaky cable are connected via an RF connector.

[0028] In one specific embodiment, the feeder length between the leaky cable and the outdoor communication cabinet is less than or equal to 10 meters.

[0029] In one specific embodiment, a DC interrupter is installed at the beginning of both leaky cables. Specifically, the DC interrupter is installed at the beginning of the leaky cable by screwing. A surge arrester is installed at the connector plug inside the vacuum pipe where the high-voltage connection device is located. Specifically, the surge arrester is installed at the connector plug inside the vacuum pipe by screwing. After the feeder shielding layer is treated, it is connected to the grounding point of the surge arrester, and finally connected to the low-voltage grounding electrode on the south side of the pipe via a grounding wire. On the connector plug side outside the vacuum pipe, a grounding clamp is installed on the feeder cable between the vacuum pipe and the base station combiner. The feeder shielding layer is connected to the metal clip of the grounding clamp, and the grounding clamp is connected to the low-voltage grounding electrode outside the pipe beam via a grounding wire. The low-voltage grounding electrode inside the vacuum pipe and the low-voltage grounding electrode outside the pipe beam are both grounding flat steel.

[0030] Furthermore, the leaky cable includes an inner conductor, an insulating dielectric layer, an outer conductor, and a cable protective sheath arranged sequentially from the inside out. The outer surface of the cable protective sheath is provided with an anti-corrosion surface layer, and several slots are formed on the surface of the outer conductor.

[0031] In one alternative embodiment, the wireless communication grounding system of the low-vacuum pipeline ultra-high-speed maglev transportation line also includes an equipment room communication cabinet, which is connected to each outdoor communication cabinet via a single-mode 8-core optical cable.

[0032] In the wireless communication grounding system for the low-vacuum pipeline ultra-high-speed maglev transportation line provided by this invention, the radio base station (RBS) and the leaky cable are connected via a feeder for transmitting communication signals. The feeder and the leaky cable are connected via an RF connector, and the feeder length is controlled within 10 meters to ensure the quality of wireless signal transmission. Lightning protection grounding is applied to the feeder cable, and corresponding grounding clamps, surge protectors, DC blockers, and other devices are installed. The DC blocker serves to: ① prevent DC from affecting the leaky cable signal transmission; ② protect the radio base station (RRU) connected to the leaky cable; and ③ protect construction personnel inside the pipeline. The surge protector prevents lightning strikes from harming the RRU equipment and personnel. The grounding clamp prevents lightning strikes from diverting current through the feeder outside the flange, thus preventing damage to the RRU equipment.

[0033] The wireless communication grounding system for the low-vacuum pipeline ultra-high-speed maglev transportation line provided in this embodiment of the invention adopts lightning protection grounding treatment at the feeder cable of the wireless communication system and sets up corresponding grounding cards, surge protectors and other devices. It can avoid the harm of lightning strikes to RRU equipment and personnel through surge protectors, and after avoiding lightning strikes, the grounding card conducts current through the feeder outside the flange to avoid damage to RRU equipment, thus providing a guarantee for the safe operation and reliable grounding of the wireless communication system.

[0034] Furthermore, those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of the invention and form different embodiments. For example, any of the claimed embodiments can be used in any combination.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wireless communication grounding system for a low-vacuum pipeline ultra-high-speed maglev transportation line, the system comprising an in-pipe communication cabinet, a leaking cable connected to the in-pipe communication cabinet and installed on the inner side wall of the metal vacuum pipeline, an outdoor communication cabinet installed outside the metal vacuum pipeline, and a cable grounding device; A high-pressure connection device is installed on the wall of the metal vacuum pipe. The high-pressure connection device includes a connection body and two sets of connection plugs located inside and outside the metal vacuum pipe. The connection body is set in the interface reserved in the vacuum pipe. The connection body includes a connector with internal and external conductivity. The connector is airtightly connected to the two sets of plug assemblies located inside and outside the metal vacuum pipe. The connection plug of the high-pressure connection device located inside the vacuum pipe is connected to the leakage cable through the first set of feeders. The connection plug of the high-pressure connection device located outside the vacuum pipe is connected to the outdoor communication cabinet through the second set of feeders. The connection between the first set of feeders and the second set of feeders is realized through the connector in the connection body. A sealing structure is set at the junction of the high-pressure connection device and the metal vacuum pipe. The cable grounding device includes a surge arrester and a feeder grounding clamp. The surge arrester is connected to the connector plug of the high-voltage connection device located inside the vacuum pipeline. The shielding layer of the first set of feeders is connected to the grounding point of the surge arrester and is connected to the weak current grounding body set inside the vacuum pipeline through the grounding wire of the surge arrester. The feeder grounding clamp is connected to the shielding layer of the second set of feeders outside the vacuum pipeline and is connected to the weak current grounding body set outside the pipe beam through the grounding wire of the grounding clamp.

2. The system according to claim 1, characterized in that, The cable grounding device also includes a DC disconnector for the communication line installed between the leaking cable and the outdoor communication cabinet.

3. The system according to claim 2, characterized in that, The DC interrupter is connected between the first set of feeders and the leaky cable, or between the second set of feeders and the outdoor communication cabinet.

4. The system according to any one of claims 1-3, characterized in that, The leaky cable includes an inner conductor, an insulating dielectric layer, an outer conductor, and a cable protective sheath arranged sequentially from the inside out. The outer surface of the cable protective sheath is provided with an anti-corrosion layer, and several slots are formed on the surface of the outer conductor.

5. The system according to any one of claims 1-3, characterized in that, The system also includes an inter-equipment communication cabinet, which is connected to each outdoor communication cabinet via a single-mode 8-core optical cable.

6. The system according to any one of claims 1-3, characterized in that, The first set of feeders is connected to the leaky cable via an RF connector.

7. The system according to any one of claims 1-3, characterized in that, The feeder length between the leaky cable and the outdoor communication cabinet is less than or equal to 10 meters.

8. The system according to any one of claims 1-3, characterized in that, The low-voltage grounding electrode installed inside the vacuum pipe and the low-voltage grounding electrode installed outside the pipe beam are low-voltage grounding flat steel.

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