Intelligent induction high flame retardant B1 level cable

Abstract

The application discloses a high flame-retardant B1 grade cable with intelligent induction, which comprises a core, a fire-resistant layer winding, a first flame-retardant filling layer, a metal armor, a second flame-retardant filling layer, an intelligent induction device, a third flame-retardant filling layer and a flame-retardant sheath arranged in sequence from inside to outside, wherein the intelligent induction device is uniformly arranged along the axial direction of the flame-retardant cable, the intelligent induction device is internally provided with an induction coil and a temperature sensing fuse connected with an induction chip, the induction chip is internally provided with information data corresponding to the axial position of the cable, the temperature value caused by the external heat of the cable at the core is judged through wireless communication of an RFID radio frequency electronic tag and a reader and a temperature sensing fuse of a tag coil, different resonant inductances and tag antenna circuits are arranged at the reader and the electronic tag, the generated resonant circuits are one-to-one corresponding, so that the fuse of which temperature grade is currently disconnected is judged, and thus the core temperature is obtained; the principle is simple and practical, implementation is convenient, and the safety and intelligence of the flame-retardant cable are greatly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric energy transmission, in particular to a high-flame-retardant B1-level cable with intelligent induction. BACKGROUND

[0002] With the development of society, the progress of technology and the continuous improvement of people's living standards, the construction and engineering fields have developed rapidly, making the current traffic bridges, civil buildings and office buildings develop into large-scale intelligent fields, and the power distribution technology of large buildings is continuously improved. The safety standard level of large buildings is generally more stringent than that of ordinary small and medium-sized buildings. B1-level flame-retardant cables are widely used due to their excellent safety performance in fire scenarios. Although B1-level flame-retardant cables can play a role in flame retardation and fire spread prevention during a fire, they are not completely non-flammable, but their flame spread, heat release rate peak, total heat release within 1200S, and combustion growth rate index are significantly better than ordinary cables. The power transmission function of the cable is its fundamental mission, and in high-rise and super high-rise buildings, the power is completely transmitted from the bottom to the top. Although emergency power is provided in these buildings in the event of a fire, it cannot meet all needs, but many high-power devices such as elevators, lighting systems, fire water pumps, and building automation systems (BAS) can be normally powered by building power cables, which can improve the evacuation efficiency of people during a fire. However, the power handling measures during a fire are generally power failure. This seemingly irreconcilable contradiction between the two opposing measures can be greatly improved if the normal supply of power is ensured under safe conditions.

[0003] In terms of flame-retardant power cables, monitoring the safety of the cable during a fire and controlling whether to cut off the power supply can effectively solve the above-mentioned contradiction, i.e., ensuring safety while maximizing the normal supply of power.

[0004] There are also similar cables in the prior art, such as Chinese patent document CN 109461531A, which describes an intelligent early warning type fireproof and waterproof flame-retardant cable. A monitoring wire core is provided on the outside of the cable, which is burned out at the same time as the outer sheath when a fire occurs, and a detection device is used to cut off the power supply of the cable. However, flame-retardant cables generally have multiple fireproof measures, and the monitoring wire core provided on the outside cannot directly represent the actual situation of the power cable in the core. Often, the core is still very safe due to the effects of fireproof mud, armor, mica winding layer, and flame-retardant filler, and cutting off the power supply cannot maximize the provision of power under safe conditions. SUMMARY

[0005] The technical problem solved by the present application is to provide a high flame-retardant B1 level cable with intelligent induction, which can provide power supply under safe conditions to the maximum extent.

[0006] To solve the above technical problems, the technical solution adopted by the present application is:

[0007] A high flame-retardant B1 level cable with intelligent induction, the flame-retardant cable comprises a core, a fire-resistant layer, a first flame-retardant filling layer, a metal armor, a second flame-retardant filling layer, an intelligent induction device, a third flame-retardant filling layer and a flame-retardant sheath arranged in sequence from inside to outside, the intelligent induction device is uniformly arranged along the axial direction of the flame-retardant cable, the intelligent induction device is provided with an induction coil and a temperature sensing fuse connected with an induction chip, the induction chip is provided with information data corresponding to the axial position of the cable, a reader outside the cable provides power supply to the induction chip through electromagnetic induction and detects the signal of the induction coil, reads the information data of the induction chip, when the temperature at the intelligent induction device exceeds the set temperature, the temperature sensing fuse is disconnected due to over-temperature, the temperature received by the reader changes, thereby an over-temperature alarm signal corresponding to the position of the axial fusing point is sent.

[0008] The set temperature of the above-mentioned intelligent induction device is obtained by testing the flame-retardant cable, when the intelligent induction device reaches the set temperature, the core reaches the temperature threshold value for safe operation.

[0009] The above-mentioned intelligent induction device is an RFID radio frequency electronic tag, the reader is an RFID radio frequency reader, the identification code UID stored in the ID area of the RFID radio frequency electronic tag corresponds to the cable length code, and the user data area stores the set temperature limit value.

[0010] The above-mentioned reader comprises a reader coil, the reader coil is connected with the output end of a non-contact read-write chip, and the non-contact read-write chip is in communication connection with a reading controller.

[0011] The above-mentioned reader coil is connected with the non-contact read-write chip through a resonant frequency control circuit, the resonant frequency control circuit is provided with a plurality of resonant inductors, each resonant inductor is connected with an intermediate relay in series to form a series branch, a plurality of series branches are connected in parallel and connected with a resonant capacitor, and the intermediate relay is electrically connected with the output end of the reading controller.

[0012] The intelligent induction device has multiple groups of induction coils, the number of the induction coils is the same as the resonant inductance, each induction coil and a temperature sensing fuse form a tag coil series branch, all the tag coil series branches are connected in parallel and then electrically connected with the induction chip, the inductance values of the induction coils in each tag coil series branch are the same, the temperature sensing fuses in each tag coil series branch correspond to different fuse temperature values, when the temperature sensing fuses are sequentially fused due to the change of the temperature of the intelligent induction device, the tag coil series branches are sequentially removed from the parallel connection, and the inductance values of the parallel connection structure of the induction coils correspond to the resonant frequency formed by the inductance in the induction chip and the resonant frequency formed by the resonant inductance and the resonant capacitance in the resonant frequency control circuit.

[0013] In the preferred scheme one, the number of the induction coils and the temperature sensing fuses is 2.

[0014] In the preferred scheme one, the number of the induction coils and the temperature sensing fuses is 2.

[0015] The intelligent induction high flame-retardant B1 grade cable provided by the application can judge the temperature value of the cable caused by the heat outside the cable core through the wireless communication between the RFID radio frequency electronic tag and the reader and the temperature sensing fuses of the tag coil, and the resonant circuit one-to-one correspondence is generated through the different resonant inductance and tag antenna circuit arranged at the reader and the electronic tag, so that the fuse of which temperature grade is determined to be disconnected, and the temperature of the cable core is obtained. BRIEF DESCRIPTION OF DRAWINGS

[0016] The application will be further described below in combination with the drawings and embodiments:

[0017] Figure 1 It is a structural schematic diagram of the flame-retardant cable of the application;

[0018] Figure 2 It is a structural schematic diagram of the intelligent induction device and the reader of the application;

[0019] Figure 3 It is an electrical schematic diagram of the intelligent induction device of the application;

[0020] Figure 4 It is an electrical structure diagram of the resonant frequency control circuit of the application;

[0021] Figure 5 It is a structural schematic diagram of the preferred scheme one of the intelligent induction device;

[0022] Figure 6 It is a structural schematic diagram of the preferred scheme two of the intelligent induction device;

[0023] Figure 7The schematic diagram of the communication between the reader and the flame-retardant cable;

[0024] Figure 8 The schematic diagram of the use of the embodiment.

[0025] Wherein: the core 1, the fireproof layer 2, the first flame-retardant filling layer 3, the metal armor 4, the second flame-retardant filling layer 5, the intelligent induction device 6, the induction chip 61, the induction coil 62, the temperature sensing fuse 63, the third flame-retardant filling layer 7, the flame-retardant sheath 8, the reader 9, the reader coil 91, the non-contact read-write chip 10, the reading controller 11, the reader power supply 12, the flame-retardant cable 13, the incoming line cabinet 14, the resonant frequency control circuit 15. DETAILED DESCRIPTION

[0026] The technical scheme of the present application is described in detail below in combination with the drawings and embodiments.

[0027] As shown in Figures 1-4 A high flame-retardant B1-level cable with intelligent induction, the flame-retardant cable 13 comprises, from inside to outside, the core 1, the fireproof layer 2, the first flame-retardant filling layer 3, the metal armor 4, the second flame-retardant filling layer 5, the intelligent induction device 6, the third flame-retardant filling layer 7, and the flame-retardant sheath 8, the intelligent induction device 6 is arranged uniformly along the axial direction of the flame-retardant cable 13, the intelligent induction device 6 is provided with the induction coil 62 and the temperature sensing fuse 63 connected with the induction chip 61, the induction chip 61 is provided with information data corresponding to the position of the cable axis, the reader 9 outside the cable provides power supply to the induction chip 61 through electromagnetic induction, detects the signal of the induction coil 62, reads the information data of the induction chip 61, when the temperature at the intelligent induction device 6 exceeds the set temperature, the temperature sensing fuse 63 is disconnected due to over-temperature, the temperature received by the reader 9 changes, thereby sending an over-temperature alarm signal corresponding to the position of the axial melting point.

[0028] The set temperature at the intelligent induction device 6 is obtained by testing the flame-retardant cable 13, when the intelligent induction device 6 reaches the set temperature, the core 1 reaches the temperature threshold value for safe operation.

[0029] The intelligent induction device 6 is arranged between the second flame-retardant filling layer 5 and the third flame-retardant filling layer 7, due to the flame-retardant and heat-insulating effects of the flame-retardant sheath 8 and the third flame-retardant filling layer 7, the temperature sensing fuse 63 will not easily melt, and the set temperature at the intelligent induction device 6 can reflect the temperature of the core 1 through test, so that the flame-retardant cable 13 is durable and intelligent and safe, and the intelligent induction device 6 is arranged outside the metal armor 4, which can avoid the signal shielding effect of the "Faraday cage" of the metal armor 4, and electromagnetic induction can pass through the flame-retardant sheath 8 and the third flame-retardant filling layer 7 to reach the intelligent induction device 6.

[0030] The intelligent sensing device 6 is an RFID electronic tag, and the reader 9 is an RFID reader. The identification code UID stored in the ID area of the RFID electronic tag corresponds to the cable length code, and the user data area stores the set temperature limit value.

[0031] The RFID reader generates resonance oscillation through the internal inductance and capacitance, and generates induction with the coil inductance and capacitance of the RFID electronic tag. The RFID electronic tag transmits information to the reader by changing the impedance modulation of the radio frequency front-end circuit and reflecting the carrier wave through the chip inside the RFID electronic tag. The reader can read all the electronic tag information on the cable at the same time through the anti-collision mechanism and coding algorithm.

[0032] The reader 9 includes a reader coil 91 connected with the output end of the non-contact read-write chip 10. The non-contact read-write chip 10 is in communication connection with the reading controller 11.

[0033] The reader coil 91 is connected with the non-contact read-write chip 10 through the resonance frequency control circuit 15. The resonance frequency control circuit 15 is provided with a plurality of resonance inductors. Each resonance inductor is connected with an intermediate relay in series to form a series branch. The plurality of series branches are connected in parallel and connected with a resonance capacitor. The intermediate relay is electrically connected with the output end of the reading controller 11.

[0034] The intelligent sensing device 6 is provided with a plurality of sensing coils 62. The number of the sensing coils 62 is the same as that of the resonance inductors. Each sensing coil 62 is connected with a temperature sensing fuse 63 to form a tag coil series branch. All the tag coil series branches are connected in parallel and electrically connected with a sensing chip 61. The inductance values of the sensing coils 62 in each tag coil series branch are the same. The temperature sensing fuses 63 in each tag coil series branch correspond to different fuse temperature values. When the temperature of the intelligent sensing device 6 changes and the temperature sensing fuses 63 are fused in turn, the tag coil series branches are sequentially removed from the parallel connection. The inductance value of the parallel connection of the sensing coils 62 forms a one-to-one correspondence with the resonance frequency formed by the inductance of the sensing chip 61 and the capacitance and the resonance frequency formed by the resonance inductance and the resonance capacitance in the resonance frequency control circuit 15.

[0035] The total inductance formula of the parallel connection of the inductors is Lpar=1 / (1 / L1+1 / L2+1 / L3+1 / L4+…). When the inductances are the same, Lpar=L / n, and n is the number of the inductors connected in parallel.

[0036] The above setting distance is described as follows: Figure 3 and 4As shown, the number of resonant inductors is 2. The contactless read / write chip 10 uses the FM17520 read / write chip, with pins 11 and 13 corresponding to TX1 transmit output pin 1 and TX2 transmit output pin 2, respectively. L1 = 2L3 and L2 = 2L4 are set. The number of induction coils 62 is 2. Assuming the inductance value of induction coil 62 is L, when the cable is in normal use, two sets of tag coil series branches are connected in parallel. The total inductance of the parallel branches is L / 2. The read controller 11 generates a high level control signal CT3 or / and CT4, and the intermediate relays K3 or / and K4 are connected. At this time, L3, C9, C11, C13, and C14 form a resonant capacitor C and an inductance L1 / 2. According to the formula for the resonant frequency of an LC series circuit, the resonant frequency is... Make this resonant frequency value correspond to the resonant frequency value of the intelligent sensing device 6 at this time. The reading controller 11 can receive the signal fed back by the intelligent sensing device 6 through the connection of K3 or / and K4 at this time. It can know that the parallel connection of the two sets of tag coil series branches is normal, and thus know that the two temperature-sensitive fuses 63 have not blown.

[0037] Similarly, it can be deduced that when the temperature at the intelligent sensing device 6 reaches the lower of the temperature-sensitive fuses 63, the temperature-sensitive fuse 63 with the lower melting temperature melts. At this time, only one tag coil series branch is connected, and the total inductance is L. At this time, the relays K1 and / or K2 of the reading controller 11 are connected, which can generate the same resonant frequency as the current intelligent sensing device 6. The reader 9 can receive the signal from the intelligent sensing device 6 indicating that a temperature-sensitive fuse 63 has melted. Therefore, the current temperature at the intelligent sensing device 6 can be known from the melting temperature from high to low.

[0038] In the preferred embodiment, the number of the aforementioned induction coil 62 and temperature-sensitive fuse 63 is 2.

[0039] like Figure 5 As shown, when the temperature-sensitive fuse 63 is set to 2, the corresponding measures taken for the melting temperature of the 2 temperature-sensitive fuses 63 are the warning temperature and the power-off temperature. The warning temperature indicates that the temperature at the current core is abnormal, and the power-off temperature indicates that the temperature at the core has reached the limit and the power must be cut off.

[0040] In the preferred embodiment, the number of the aforementioned induction coil 62 and temperature-sensitive fuse 63 is 3.

[0041] like Figure 6As shown in the middle, set the temperature fuse 63 and temperature fuse 63 quantity is 2, the corresponding temperature fuse 63 of 2 corresponding to the measures taken for the temperature of the pre-warning temperature, alarm temperature and power-off temperature, pre-warning temperature indicates the temperature of the current wire core abnormal 1, alarm temperature indicates the temperature of the current wire core abnormal 2, need to troubleshoot, continue to power supply, power-off temperature indicates that the temperature of the wire core reaches the limit, must be powered off.

[0042] As shown in the middle, set the temperature fuse 63 and temperature fuse 63 quantity is 2, the corresponding temperature fuse 63 of 2 corresponding to the measures taken for the temperature of the pre-warning temperature, alarm temperature and power-off temperature, pre-warning temperature indicates the temperature of the current wire core abnormal 1, alarm temperature indicates the temperature of the current wire core abnormal 2, need to troubleshoot, continue to power supply, power-off temperature indicates that the temperature of the wire core reaches the limit, must be powered off. Figure 7 and 8 As shown in the middle, set the temperature fuse 63 and temperature fuse 63 quantity is 2, the corresponding temperature fuse 63 of 2 corresponding to the measures taken for the temperature of the pre-warning temperature, alarm temperature and power-off temperature, pre-warning temperature indicates the temperature of the current wire core abnormal 1, alarm temperature indicates the temperature of the current wire core abnormal 2, need to troubleshoot, continue to power supply, power-off temperature indicates that the temperature of the wire core reaches the limit, must be powered off. As shown in the middle, set the temperature fuse 63 and temperature fuse 63 quantity is 2, the corresponding temperature fuse 63 of 2 corresponding to the measures taken for the temperature of the pre-warning temperature, alarm temperature and power-off temperature, pre-warning temperature indicates the temperature of the current wire core abnormal 1, alarm temperature indicates the temperature of the current wire core abnormal 2, need to troubleshoot, continue to power supply, power-off temperature indicates that the temperature of the wire core reaches the limit, must be powered off.

Claims

1. A high flame retardant B1 class cable with intelligent sensing, characterized in that, The fire-retardant cable (13) comprises a core (1), a fire-resistant layer (2), a first fire-retardant filling layer (3), a metal armor (4), a second fire-retardant filling layer (5), a smart induction device (6), a third fire-retardant filling layer (7) and a fire-retardant sheath (8) arranged in sequence from inside to outside, the smart induction device (6) is arranged uniformly along the axial direction of the fire-retardant cable (13), the smart induction device (6) is provided with an induction coil (62) and a temperature-sensitive fuse (63) connected with an induction chip (61), the induction chip (61) is provided with information data corresponding to the axial position of the cable, a reader (9) outside the cable provides power to the induction chip (61) through electromagnetic induction and detects the signal of the induction coil (62) to read the information data of the induction chip (61), when the temperature at the smart induction device (6) exceeds the set temperature, the temperature-sensitive fuse (63) is disconnected due to over-temperature, the temperature received by the reader (9) changes, thereby an over-temperature alarm signal corresponding to the axial position of the fuse is sent out; The set temperature at the smart induction device (6) is obtained by testing the fire-retardant cable (13), when the smart induction device (6) reaches the set temperature, the core (1) reaches the temperature threshold value for safe operation; The smart induction device (6) is an RFID radio frequency electronic tag, the reader (9) is an RFID radio frequency reader, the identification code UID stored in the ID area of the RFID radio frequency electronic tag corresponds to the cable length code, and the set temperature limit value is stored in the user data area; The reader (9) comprises a reader coil (91), the reader coil (91) is connected with an output end of a non-contact read-write chip (10), and the non-contact read-write chip (10) is in communication connection with a reading controller (11); The reader coil (91) is connected with the non-contact read-write chip (10) through a resonant frequency control circuit (15), a plurality of resonant inductors are arranged in the resonant frequency control circuit (15), each resonant inductor is connected with an intermediate relay in series to form a series branch, a plurality of series branches are connected in parallel and connected with a resonant capacitor, and the intermediate relay is connected with an output end of the reading controller (11) in electricity; The smart induction device (6) is provided with a plurality of induction coils (62), the number of the induction coils (62) is the same as that of the resonant inductors, each induction coil (62) is connected with a temperature-sensitive fuse (63) to form a tag coil series branch, all the tag coil series branches are connected in parallel and connected with the induction chip (61) in electricity, the inductance values of the induction coils (62) in each tag coil series branch are the same, the temperature-sensitive fuses (63) in each tag coil series branch correspond to different fuse temperature values, when the temperature at the smart induction device (6) changes and the temperature-sensitive fuses (63) are sequentially disconnected, the tag coil series branches sequentially exit the parallel connection, the inductance values of the parallel connection of the induction coils (62) correspond to the resonant frequency of the resonant capacitor in the induction chip (61) and the resonant frequency of the resonant inductor and the resonant capacitor in the resonant frequency control circuit (15).

2. A high flame retardant B1 class cable with intelligent sensing as claimed in claim 1, wherein, The number of the inductive coils (62) and the thermal fuses (63) is 2.

3. A high flame retardant B1 class cable with intelligent sensing as claimed in claim 1, wherein, The number of the inductive coils (62) and the thermal fuses (63) is 3.

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