CN114530739B - Anti-electromagnetic interference cable and connection method thereof, transponder system and train - Google Patents
Anti-electromagnetic interference cable and connection method thereof, transponder system and train Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R31/00—Coupling parts supported only by co-operation with counterpart
- H01R31/06—Intermediate parts for linking two coupling parts, e.g. adapter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B61—RAILWAYS
- B61L—GUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
- B61L15/00—Indicators provided on the vehicle or train for signalling purposes
- B61L15/0018—Communication with or on the vehicle or train
- B61L15/0036—Conductor-based, e.g. using CAN-Bus, train-line or optical fibres
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B11/00—Communication cables or conductors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/29—Protection against damage caused by extremes of temperature or by flame
- H01B7/295—Protection against damage caused by extremes of temperature or by flame using material resistant to flame
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/648—Protective earth or shield arrangements on coupling devices, e.g. anti-static shielding
- H01R13/658—High frequency shielding arrangements, e.g. against EMI [Electro-Magnetic Interference] or EMP [Electro-Magnetic Pulse]
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
- H01R43/26—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for engaging or disengaging the two parts of a coupling device
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2201/00—Connectors or connections adapted for particular applications
- H01R2201/02—Connectors or connections adapted for particular applications for antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R2201/00—Connectors or connections adapted for particular applications
- H01R2201/26—Connectors or connections adapted for particular applications for vehicles
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Communication Cables (AREA)
- Insulated Conductors (AREA)
Abstract
The invention discloses an anti-electromagnetic interference cable, a connecting method thereof, a transponder system and a train, wherein the cable is formed by disconnecting a first signal transmission cable in the cable, which is used for transmitting signals between a transponder communication unit and a transponder antenna, from a train body, so that the first signal transmission cable isolates interference signals conducted by the train body; specifically, the method includes insulating an interface of the connector that is connected to the first signal transmission cable from the connector body to prevent interfering signals from the vehicle body from entering the first signal transmission cable via the connector. The anti-electromagnetic interference cable can prevent interference signals on a carriage or a cabinet from being coupled into the cable, so that the interference condition of the cable in the use process is effectively reduced, the stability and safety of the signal transmission process of a transponder system are ensured, and the signal transmission safety of a train control system can be improved.
Description
Technical Field
The invention belongs to the technical field of train signal cables, and particularly relates to an anti-electromagnetic interference cable, a connecting method thereof, a transponder system and a train.
Background
The transponder communication units BTM and transponder antennas (CAU) are part of train-controlled vehicle-mounted devices that are mounted inside and outside the train at the bottom, respectively, and are connected by cables. During train operation, the BTM needs to communicate wirelessly with the ground transponder: when the train passes over the ground transponder, the transponder is activated by 27MHz electromagnetic energy transmitted by the vehicle-mounted BTM antenna, the transponder begins to work and transmits message information, and the CAU receives the message and transmits the message to the BTM through a cable.
With the rapid development of high-speed railways in China, the electromagnetic environment becomes increasingly complex, and the influence of electromagnetic interference on a train BTM system is increasingly large. The cable is used as an important component of the BTM system and is connected with the CAU and the host for signal transmission, and the safety operation of the train is influenced by the good or bad electromagnetic compatibility of the cable.
Taking the D cable as an example, the existing D cable is connected to the vehicle-mounted ATP cabinet via a ground wire, and the cabinet is connected to the ground via a vehicle body. As shown in fig. 1, which is a schematic diagram of an internal connection structure of a grounding type D cable in the prior art, there are 4 core wires in the D cable, a shielding layer is disposed outside each core wire, a C interface of an 8-core circular CT63-1208 connector at one end of the D cable is grounded, and is used for connecting a train body to ensure the grounding of the connector, and the shielding layers outside the 4 core wires are all grounded by connecting the C interface, so that in the prior art, the design is used for guiding interference into the train body and then guiding the interference into the ground; however, in many practical applications, it has been found that the cable-receiving body can instead introduce disturbances on the body into the cable, thereby causing a failure of the transponder system. For example, when the bow net of the passing neutral section of the train discharges offline, the interference signal is coupled to the car body through conduction, and the ground wire of the D cable is connected to the car body, the interference signal may be introduced into the D cable, thereby affecting the normal signal transmission of the D cable.
Disclosure of Invention
In order to solve the problems, the invention provides an anti-electromagnetic interference cable, a connecting method thereof, a transponder system and a train, and the cable can be prevented from receiving interference signals from a train body.
The invention discloses an anti-electromagnetic interference cable, which comprises:
the first signal transmission cable comprises a first core wire and a first shielding layer sleeved outside the first core wire, and the first shielding layer is insulated from the first core wire;
the two connectors are respectively connected to two ends of the first signal transmission cable, are respectively used for connecting a transponder communication unit positioned in a train and a transponder antenna positioned outside the train, and are used for transmitting signals between the transponder communication unit and the transponder antenna;
wherein each of the connectors includes a first cable interface and a second cable interface; insulation between the first cable interface and the second cable interface; the first core wire is communicated with a first cable interface in the connector, and the first shielding layer is communicated with a second cable interface in the connector.
Further, the first signal transmission cable further comprises a first insulating layer and a first protective layer, wherein the first insulating layer is arranged between the first core wire and the first shielding layer, and the first insulating layer is made of nonpolar resin;
the first protective layer is sleeved outside the first shielding layer, and the first protective layer is made of halogen-free flame-retardant elastic materials.
Further, the anti-electromagnetic interference cable further comprises a second protection layer and a third protection layer, and the second protection layer and the third protection layer are sequentially sleeved outside the first signal transmission cable and used for protecting the first signal transmission cable.
Further, the second protective layer is made of a low-smoke halogen-free flame-retardant material; the third protective layer is made of halogen-free flame-retardant elastic materials.
Further, the anti-electromagnetic interference cable further comprises a second signal transmission cable, and the second signal transmission cable and the first signal transmission cable are arranged side by side;
the second signal transmission cable comprises a second core wire, a second insulating layer, a second shielding layer and a fourth protective layer; the second insulating layer, the second shielding layer and the fourth protective layer are sleeved outside the second core wire in sequence; the second shield layer is insulated from the second core wire.
Further, the second core wire is made of silver-plated copper wires;
the second shielding layer is formed by braiding copper foil and tinned copper wires, or comprises an outer layer formed by braiding copper foil and tinned copper wires and an inner layer formed by aluminum foil or PET (polyethylene terephthalate) materials.
Further, the first core wire is made of copper stranded wires and is used for transmitting 27.095MHz power waves;
the first shielding layer is formed by braiding copper foil and tinned copper wires, or comprises an outer layer formed by braiding copper foil and tinned copper wires and also comprises an inner layer formed by aluminum foil or PET (polyethylene terephthalate) materials.
Further, the anti-electromagnetic interference cable is a D cable.
The invention also discloses a connection method of the anti-electromagnetic interference cable, which comprises the following steps:
connecting two ends of the anti-electromagnetic interference cable with a transponder communication unit positioned in a train and a transponder antenna positioned outside the train respectively, and transmitting signals between the transponder communication unit and the transponder antenna by the first signal transmission cable;
and disconnecting a first signal transmission cable in the anti-electromagnetic interference cable from a train body of the train.
The invention also discloses a transponder system, which comprises a transponder communication unit, a transponder antenna and a cable, wherein the cable is the anti-electromagnetic interference cable.
The invention also discloses a train comprising the transponder system, which is the transponder system disclosed by the invention.
The anti-electromagnetic interference cable is characterized in that a first signal transmission cable in the cable, which is used for connecting a transponder communication unit positioned in a train and a transponder antenna positioned outside the train and transmitting signals, is connected with a vehicle body in an insulating way, so that the first signal transmission cable isolates interference signals conducted by the vehicle body; specifically, the method includes insulating an interface of the connector that is connected to the first signal transmission cable from the connector body to prevent interfering signals from the vehicle body from entering the first signal transmission cable via the connector. The anti-electromagnetic interference cable can prevent interference signals on a carriage or a cabinet from being coupled into the cable, so that the interference condition of the cable in the use process is effectively reduced, the stability and safety of the signal transmission process of a transponder system are ensured, and the signal transmission safety of a train control system can be improved. Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic view of a cable internal connection structure according to the prior art;
fig. 2 shows a schematic diagram of the internal connection relationship of a cable according to a first embodiment of the present invention;
fig. 3 is a schematic view showing a cross-sectional structure of a cable according to a first embodiment of the present invention;
fig. 4 shows a schematic diagram of the internal connection relationship of a cable according to a second embodiment of the present invention;
fig. 5 shows a schematic cross-sectional structure of a cable according to a second embodiment of the invention;
FIG. 6 illustrates a transponder system according to an embodiment of the present invention;
fig. 7 shows a schematic cross-sectional structure of a double-shielding cable according to an embodiment of the invention.
The main reference numerals in the drawings illustrate:
1. a first signal transmission cable; 2. a connector; 3. a second signal transmission cable; 4. a second protective layer; 5. a third protective layer; 11. a first core wire; 12. a first shielding layer; 13. a first insulating layer; 14. a first protective layer; 31. a second core wire; 32. a second shielding layer; 33. a second insulating layer; 34. and a fourth protective layer.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Considering that in the running of the train, the problem that the fault of the transponder system and the safe running of the train are affected due to the fact that the internal structure of the D cable in the existing transponder system is connected (conducted) with the train body, so that an interference signal can be possibly introduced into the D cable to influence the normal signal transmission of the D cable is found; for example, when the train passing neutral section bow net discharges offline, the disturbance signal is coupled to the train body by conduction and then introduced into the D cable through the train body, causing a failure of the transponder system. The invention provides an anti-electromagnetic interference cable, a transponder system and a train.
Taking the application of the D cable as an example, the D cable mentioned in the present application is a D interface cable, which is a special cable applied to the railway communication field, specifically, installed in a train body, and used for transmitting high-frequency communication signals between a transponder antenna and a BTM host. Where D represents the communication line between the transponder antenna and the BTM host. It should be understood that, as a practical matter, those skilled in the art may also use the anti-electromagnetic interference cable of the present invention as a connection cable for isolating the vehicle body interference signal, and the D cable in the embodiment of the present application is only an exemplary illustration of an application of the anti-electromagnetic interference cable of the present invention.
Embodiment one:
for the convenience of understanding the present embodiment, a detailed description of an anti-electromagnetic interference cable disclosed in the embodiments of the present application will be first provided. As shown in fig. 2, a schematic structural diagram of an anti-electromagnetic interference cable according to an embodiment of the present invention includes:
the first signal transmission cable 1 comprises a first core wire 11 and a first shielding layer 12 sleeved outside the first core wire 11, wherein the first shielding layer 12 is insulated from the first core wire 11;
the connectors 2 are respectively connected to two ends of the first signal transmission cable 1, and each connector 2 comprises a shell, and a first cable interface and a second cable interface which are positioned in the shell; the first cable interface, the second cable interface and the shell are insulated; the first core wire 11 is communicated with a first cable interface in the connector 2, and the first shielding layer 12 is communicated with a second cable interface in the connector 2;
the two connectors 2 are in particular used for connecting a transponder communication unit located inside the train and a transponder antenna located outside the train, respectively, and the first signal transmission cable 1 is used for transmitting signals between the transponder communication unit and the transponder antenna.
In the embodiment of the application, two connectors 2 connect intercommunication transponder communication unit and transponder antenna respectively, the casing outside the transponder antenna is metal casing, this metal casing and train automobile body fixed connection, the inside transponder antenna of this metal casing and train automobile body disconnection, when the casing of connector 2 is connected with the transponder antenna, contact conduction between the casing of connector 2 and the metal casing outside the transponder antenna, but because insulating between the first cable interface and the second cable interface in connector 2, also insulating between first cable interface, second cable interface and the casing of connector 2, and then can ensure that the inside first signal transmission cable 1 of cable only communicates transponder communication unit and transponder antenna, stopped automobile body interference signal and got into first signal transmission cable 1.
Fig. 3 is a schematic diagram of a cable cross-section structure of an electromagnetic interference resistant cable according to a first embodiment of the present invention, specifically, a single-wire electromagnetic interference resistant cable, as shown in fig. 3, the first signal transmission cable 1 includes a first insulating layer 13 and a first protective layer 14, the first insulating layer 13 is disposed between the first core wire 11 and the first shielding layer 12, and a material of the first insulating layer 13 is nonpolar resin;
the first protection layer 14 is sleeved outside the first shielding layer 12, and the material of the first protection layer 14 is halogen-free flame retardant elastic material.
In the embodiment of the application, the anti-electromagnetic interference cable further comprises a second protection layer 4 and a third protection layer 5, and the second protection layer 4 and the third protection layer 5 are sequentially sleeved outside the first signal transmission cable 1 and are used for protecting the first signal transmission cable 1. Wherein the second protective layer 4 is made of a low-smoke halogen-free flame-retardant material; the third protective layer 5 is made of halogen-free flame-retardant elastic material.
The first core wire 11 is made of copper stranded wires and is formed by stranding a plurality of strands of copper wires and is used for transmitting 27.095MHz power waves; the first shielding layer 12 is formed by braiding copper foil and tinned copper wires.
Optionally, the first shielding layer 12 has a double-layer structure, and a layer of aluminum foil is further arranged on the inner side of the outer layer formed by braiding copper foil and tinned copper wires, and the aluminum foil is wrapped outside the first insulating layer 13.
Referring to fig. 2, according to a first embodiment of the present application, the connector 2 is a type 8-core circular CT63-1208 connector, and 8 internal interfaces of the CT63-1208 connector are isolated from the housing of the CT63-1208 connector, so as to avoid the cable from being conducted with the train body through the interfaces and the connector housing.
In this embodiment, the connection relationship between the CT63-1208 connector and the first signal transmission cable 1 of the cable is as follows:
referring to the above table, the vehicle upper end CT63-1208 connector means a connector provided between the cable of the present invention and the vehicle-mounted transponder communication unit BTM, the vehicle lower end CT63-1208 connector means a connector provided between the cable of the present invention and the transponder antenna CAU, and the first core wire 11 is a thick wire TX in the above table for communication operation between the transponder communication unit BTM and the transponder antenna CAU, transmitting a power wave of 27.095 MHz.
In this embodiment, as shown in fig. 2, the C interface is not connected to the ground wire, and is empty in the table, and any two interfaces isolated from each other in the connector can be selected as the first cable interface and the second cable interface. As shown in the table above, the hole site number A is a first cable interface connected with the first core wire 11, the hole site number G is a second cable interface connected with the first shielding layer 12, and other hole site numbers in the CT63-1208 connectors are all set to be empty and insulated from the train body, and the design that the first shielding layer 12 in the first signal transmission cable 1 is communicated with the train body through the connector shell is cancelled, so that interference signals on a carriage or a cabinet are prevented from being coupled into the cable, the signal interference condition of the cable, which is transmitted by the train body, in the using process is effectively reduced, the immunity of the cable is further improved, and meanwhile, the safe operation of a transponder system can be ensured.
It should be understood that the CT63-1208 connector is selected for only one model of connector 2, and that other connectors may be selected that meet the requirements of the present application: the connector 2 includes a first cable interface and a second cable interface which are insulated from each other, and the first cable interface and the second cable interface are not conducted with the vehicle body.
In comparison to the prior art shown in fig. 1, the C interface in the CT63-1208 connector is connected to a ground line to achieve grounding in the prior art. The cable in this embodiment adopts the following three key ways to achieve the effect of improving the electromagnetic interference resistance of the cable: a. the C interface connection ground wire in the connector 2 in the prior art is canceled; b. the use of all interfaces except A, G (i.e., the first cable interface and the second cable interface) is eliminated, leaving only the connector interface for implementing the signal transfer function between the transponder communication unit and the transponder antenna; c. the continuity of the connector 2 housing with the cable inner shield is cancelled. Through actual measurement, the connector interfaces are disconnected with the vehicle body, so that the electromagnetic interference resistance of the cable is greatly improved. By way of example, the wiring mode inside the D cable can be modified on the basis of a conventional D cable, so that the immunity of the D cable is improved, interference signals on a carriage or a cabinet are prevented from being coupled into the D cable, and the interference condition of the D cable in the use process is effectively reduced.
In one embodiment of the present application, the main usage performance indexes of the single-wire type anti-electromagnetic interference D cable include: the D cable can complete the transmission of an uplink 4.23MHz signal and the transmission of a downlink 27.095MHz signal; the D cable port is adapted to an autonomous CAU antenna D interface; the whole cable is not provided with a grounding point (namely is isolated from the vehicle body); d cable insulation resistance is not less than 500MΩ (under 500VDC condition); d, the withstand voltage of the cable is more than or equal to 1000VAC; d, the salt fog tolerance of the cable needs to be over 96 hours; the low smoke halogen-free index of the D cable meets the standards GB/T17651.2 and GB/T176502, and the flame retardant index meets the standard GB/T18380.31; the impact requirement accords with class 1 class B in IEC 61373; the vibration requirement meets class 1 class B in IEC 61373.
Embodiment two:
in combination with the first embodiment, the anti-electromagnetic interference cable in the second embodiment of the present application further includes a second signal transmission cable 3, where the second signal transmission cable 3 is disposed side by side with the first signal transmission cable 1;
fig. 4 is a schematic diagram of an internal connection relationship of a cable according to a second embodiment of the present invention, and fig. 5 is a schematic diagram of a cable cross-section structure of an electromagnetic interference resistant cable according to a second embodiment of the present invention, specifically a four-wire type electromagnetic interference resistant cable, as shown in fig. 4 and fig. 5, including a first signal transmission cable 1 and three second signal transmission cables 3;
the second signal transmission cable includes a second core wire 31, a second insulating layer 33, a second shielding layer 32, and a fourth protective layer 34; the second insulating layer 33, the second shielding layer 32 and the fourth protective layer 34 are sequentially sleeved outside the second core wire 31; the second shield layer 32 is insulated from the second core wire 31.
In the embodiment of the present application, the material of the first core wire 11 is a copper stranded wire, which is used for transmitting a 27.095MHz power wave; the first shielding layer 12 is formed by braiding copper foil and tinned copper wires, or the first shielding layer 12 is of a double-layer structure, the outer layer is formed by braiding copper foil and tinned copper wires, the inner layer is a layer of aluminum foil or a layer of PET material (PET, namely polyethylene terephthalate) wrapped outside the first insulating layer 13, the PET has excellent physical and mechanical properties in a wider temperature range, the long-term use temperature can reach 120 ℃, the electrical insulation is excellent, and even under high-temperature and high-frequency conditions, the electrical property is still better, but the corona resistance is worse, the creep resistance, the fatigue resistance, the friction resistance and the dimensional stability are all good. The second core wire 31 is made of silver-plated copper wire; the second insulating layer 33 is made of nonpolar resin material, the second shielding layer 32 is formed by braiding copper foil and tinned copper wires, or the second shielding layer 32 is of a double-layer structure, the outer layer is formed by braiding copper foil and tinned copper wires, and the inner layer is a layer of aluminum foil or a layer of PET material wrapped outside the second insulating layer 33; the fourth protective layer 34 is a halogen-free flame retardant elastomer.
Referring to fig. 5, in this embodiment, the second protection layer 4 is coated outside the first protection layer 14 and the fourth protection layer 34, the second protection layer 4 is specifically a low smoke halogen-free flame retardant filler filled in the third protection layer 5, the third protection layer 5 is a halogen-free flame retardant elastomer, and the second protection layer 4 and the third protection layer 5 together play a role of protecting the first signal transmission cable 1 and the second signal transmission cable 3 inside.
Referring to fig. 4, according to a second embodiment of the present application, there are A, B, C, D, E, F, G, H interfaces in the connector 2, wherein G, H is conducted, B, C, D is conducted, E, F is conducted, and A, B, E, G is isolated from each other. Four signal transmission cables are arranged in the cable, and the other six interfaces are reserved interface positions of the second signal transmission cable 3 except the first cable interface A and the second cable interface G which are connected with the first signal transmission cable 1. In fig. 4, a first signal transmission cable 1 is connected with a connector 2, and three second signal transmission cables 3 in the cable are empty and are not communicated with the connector 2.
As can be seen from comparison between fig. 1 and 4, in this embodiment, on the basis of the conventional cable, all the core wires and the shielding layer interfaces except the thick wire (the first core wire 11 for transmitting 27.095MHz power wave) and the first shielding layer 12 are connected (the second signal transmission cable 3 in the four-wire type anti-electromagnetic interference cable in fig. 1 is not connected with the connector 2, and 27.095MHz power is only transmitted through the first signal transmission cable 1); the connection mode of the core wires in the cable is simplified, so that the thick wires bearing the communication task can maintain the communication function, and the normal operation of the cable can not be influenced.
The second signal transmission cable 3 of the four-wire type anti-electromagnetic interference cable in fig. 1 is also connected to the connector 2, and the connector 2 is grounded through the C interface, so that the grounded first signal transmission cable 1 is grounded. In fig. 4, only the first signal transmission cable 1 in the cable is connected with the connector 2, and the connector 2 is not conducted with the first signal transmission cable 1, and the cable is not conducted with the vehicle body, so that the cable has better electromagnetic interference resistance on the premise of ensuring the communication transmission function.
As shown in fig. 5, the first signal transmission cable 1 is thicker than the second signal transmission cable 3, and in practice, the first protective layer 14 of the first signal transmission cable and the fourth protective layer 34 of each second signal transmission cable 3 may be set to different colors for distinction, and the interfaces in the connector 2 may be correspondingly identified. And the installation and the fault maintenance are convenient.
The four-wire type anti-electromagnetic interference cable in the embodiment can be used as a D cable.
It should be understood that only one shielding layer is disposed in the cable internal structure in the first embodiment and the second embodiment, and a person skilled in the art may dispose a double shielding layer or multiple shielding layers according to actual requirements, for example, a shielding layer may be disposed between the second protective layer 4 and the third protective layer 5, as shown in fig. 7, which is a schematic cross-sectional structure of a four-core double-shielding-layer cable according to an embodiment of the present invention, and a sheath and an outer shielding layer are disposed between the second protective layer 4 and the third protective layer 5, where the outer shielding layer is also formed by braiding copper foil and tinned copper wires, and the braiding density is greater than 80%.
Embodiment III:
the invention also discloses a connection method of the cable, which is the anti-electromagnetic interference cable disclosed by the invention, and comprises the following steps:
connecting two ends of the cable with a transponder communication unit positioned in the train and a transponder antenna positioned outside the train respectively, and transmitting signals between the transponder communication unit and the transponder antenna by a first signal transmission cable 1;
insulating a first signal transmission cable 1 of the cables from the train body; specifically, the first cable interfaces of the two connectors 2 are insulated from the train body; the second cable interface of the two connectors 2 is insulated from the train body so that both ends of the first signal transmission cable 1 are connected to only the transponder communication unit and the transponder antenna, respectively.
The cable in this embodiment is the anti-electromagnetic interference cable described in the first embodiment or the second embodiment.
By the method, the cable used for communication between the transponder antenna and the transponder communication unit is isolated from the train body, so that the transmission of interference signals into the transponder system through the train body approach is prevented.
The invention relates to an installation method of an anti-electromagnetic interference cable, which comprises the following steps:
first, the first core wire 11 of the first signal transmission cable 1 is communicated with a first cable interface in the connector 2, and the first shielding layer 12 of the first signal transmission cable 1 is communicated with a second cable interface in the connector 2; wherein the first core wire 11 is insulated from the first shielding layer 12; the first cable interface, the second cable interface and the housing of the connector 2 are insulated from each other.
After the first signal transmission cable 1 passes through the vehicle body, the connectors 2 at both ends are then connected to the transponder communication unit and the transponder antenna, respectively.
Embodiment four:
based on the same technical concept, the embodiment of the present application further provides a transponder system, and fig. 6 is a transponder system according to an embodiment of the present invention, including a transponder communication unit, a transponder antenna, and a cable, where the cable is an electromagnetic interference resistant cable in the first embodiment or the second embodiment of the present invention. Because the electromagnetic interference resistant cable is adopted in the scheme, the specific principle can be referred to the description of the first embodiment and the second embodiment, and the description is omitted here.
Fifth embodiment:
based on the same technical concept, the embodiment of the application also provides a train, which comprises a transponder system, wherein the transponder system is the transponder system in the fourth embodiment of the invention. Since the transponder system is adopted in the present solution, the specific principles can be referred to the description of the first embodiment, the second embodiment and the fourth embodiment, and will not be repeated here.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (11)
1. An electromagnetic interference resistant cable comprising:
the first signal transmission cable (1) comprises a first core wire (11) and a first shielding layer (12) sleeved outside the first core wire (11), wherein the first shielding layer (12) is insulated from the first core wire (11);
the connectors (2) are respectively connected to two ends of the first signal transmission cable (1), and the two connectors (2) are respectively used for connecting a transponder communication unit positioned in a train and a transponder antenna positioned outside the train and transmitting signals between the transponder communication unit and the transponder antenna;
wherein each of the connectors (2) comprises a first cable interface and a second cable interface; insulation between the first cable interface and the second cable interface; the first core wire (11) is communicated with a first cable interface in the connector (2), and the first shielding layer (12) is communicated with a second cable interface in the connector (2).
2. The anti-electromagnetic interference cable according to claim 1, characterized in that the first signal transmission cable (1) further comprises a first insulating layer (13) and a first protective layer (14), the first insulating layer (13) being disposed between the first core wire (11) and the first shielding layer (12), the material of the first insulating layer (13) being a nonpolar resin;
the first protective layer (14) is sleeved outside the first shielding layer (12), and the first protective layer (14) is made of halogen-free flame-retardant elastic materials.
3. The anti-electromagnetic interference cable according to claim 1, further comprising a second protective layer (4) and a third protective layer (5), wherein the second protective layer (4) and the third protective layer (5) are sequentially sleeved outside the first signal transmission cable (1) and are used for protecting the first signal transmission cable (1).
4. An anti-electromagnetic interference cable according to claim 3, characterized in that the material of the second protective layer (4) is a low smoke halogen-free flame retardant material; the third protective layer (5) is made of halogen-free flame-retardant elastic material.
5. An anti-electromagnetic interference cable according to claim 3, characterized in that it further comprises a second signal transmission cable (3), said second signal transmission cable (3) being arranged side by side with said first signal transmission cable (1);
the second signal transmission cable (3) includes a second core wire (31), a second insulating layer (33), a second shielding layer (32), and a fourth protective layer (34); the second insulating layer (33), the second shielding layer (32) and the fourth protective layer (34) are sequentially sleeved outside the second core wire (31); the second shielding layer (32) is insulated from the second core wire (31).
6. The anti-electromagnetic interference cable according to claim 5, characterized in that the material of the second core wire (31) is silver-plated copper wire;
the second shielding layer (32) is formed by braiding copper foil and tinned copper wires, or the second shielding layer (32) comprises an outer layer formed by braiding copper foil and tinned copper wires and also comprises an inner layer formed by aluminum foil or PET (polyethylene terephthalate) materials.
7. The anti-electromagnetic interference cable according to any one of claims 1 to 6, characterized in that the first core wire (11) is made of copper strands for transmitting power waves of 27.095 MHz;
the first shielding layer (12) is formed by braiding copper foil and tinned copper wires, or the first shielding layer (12) comprises an outer layer formed by braiding copper foil and tinned copper wires and also comprises an inner layer formed by aluminum foil or PET (polyethylene terephthalate) materials.
8. The anti-electromagnetic interference cable of claim 7 wherein the anti-electromagnetic interference cable is a D-cable.
9. A method for connecting an electromagnetic interference resistant cable according to any one of claims 1 to 8,
connecting two ends of the anti-electromagnetic interference cable with a transponder communication unit positioned in a train and a transponder antenna positioned outside the train respectively, and transmitting signals between the transponder communication unit and the transponder antenna by the first signal transmission cable (1);
and disconnecting a first signal transmission cable (1) in the anti-electromagnetic interference cable from a train body of the train.
10. A transponder system comprising a transponder communication unit, a transponder antenna and a cable, characterized in that the cable is an electromagnetic interference resistant cable according to any one of claims 1-8.
11. A train comprising a transponder system, characterized in that the transponder system is a transponder system according to claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210063680.6A CN114530739B (en) | 2022-01-20 | 2022-01-20 | Anti-electromagnetic interference cable and connection method thereof, transponder system and train |
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| CN202210063680.6A CN114530739B (en) | 2022-01-20 | 2022-01-20 | Anti-electromagnetic interference cable and connection method thereof, transponder system and train |
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| CN114530739B true CN114530739B (en) | 2024-03-22 |
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| CN202210063680.6A Active CN114530739B (en) | 2022-01-20 | 2022-01-20 | Anti-electromagnetic interference cable and connection method thereof, transponder system and train |
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| CN114530739A (en) | 2022-05-24 |
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