Linear temperature sensing cable and cable type linear temperature sensing fire detector structure
By using an alternating design of the insulation layer and conductive layer of the first core wire, the problem of the length limitation of the temperature sensing cable is solved, achieving a wider range of fire detection coverage and signal stability, and improving the accuracy and reliability of fire detection.
Patent Information
- Application Number
- CN202423157481.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2034-12-20
AI Technical Summary
The maximum usable length of existing heat-sensing cables is limited, making it difficult to cover ultra-long cable tunnels and vast areas, resulting in blank areas for fire detection and increasing the risk of fire occurrence and spread.
The design employs an interlaced first core insulation layer to increase the effective length of the temperature sensing cable while maintaining signal stability. The conductive sheath enhances the cable's flexibility and anti-interference capabilities.
Without increasing the cable length, the actual coverage of the temperature sensing cable was improved, the risk of signal fluctuations and false alarms was reduced, and the accuracy and reliability of fire detection were enhanced.
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Figure CN223815649U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The embodiment of the utility model relates to the technical field of fire fighting, especially to a linear temperature sensing cable and cable type linear temperature sensing fire detector structure. BACKGROUND
[0002] The cable type linear temperature sensing fire detector is a common fire detection equipment, mainly composed of a temperature sensing cable, a signal processing unit and a terminal device.
[0003] However, the maximum length of the temperature sensing cable is generally 200 meters, which is difficult to achieve comprehensive and effective coverage for large places such as super-long cable tunnels and wide-area warehouses, and is prone to cause blank areas of detection, thereby increasing the potential risk of fire occurrence and spread. CONTENT OF THE UTILITY MODEL
[0004] The utility model provides a linear temperature sensing cable and cable type linear temperature sensing fire detector structure, avoid increasing the length of temperature sensing cable, the reasonable change of outside temperature causes signal fluctuation.
[0005] In the first aspect, the utility model provides a linear temperature sensing cable, comprising:
[0006] An outer sheath;
[0007] N first core wires, at least two second core wires and at least one third core wire arranged in the outer sheath; N is greater than 0 and is an integer;
[0008] The first core wire, the second core wire and the third core wire all comprise a conductor, wherein the first core wire further comprises a temperature characteristic material layer wrapped on the surface of the conductor, and a first insulating material layer wrapped on the surface of the temperature characteristic material layer; the first insulating material layers of adjacent first core wires are staggered in the same direction in sequence; the second core wire further comprises a second insulating material layer wrapped on the surface of the conductor.
[0009] Optionally, the interval distance between the first insulating material layers on the first core wire is the same.
[0010] Optionally, the length size of the first insulating material layer is greater than or equal to the length size of the interval between the first insulating material layers.
[0011] Optionally, the third core wire further comprises a temperature characteristic material layer wrapped on the surface of the conductor.
[0012] Optionally, the linear temperature sensing cable further comprises a conductive layer sleeve arranged along the inner wall of the outer sheath on one side of the inner wall, and the first core wire, the second core wire and the third core wire are arranged in the conductive layer sleeve.
[0013] Optionally, the temperature characteristic material layer is a thermal sensitive material layer.
[0014] In a second aspect, the utility model discloses a cable type linear temperature sensing fire detector structure, comprising a signal processing unit, a terminal unit and the linear temperature sensing cable of any embodiment of the utility model.
[0015] Two ends of the linear temperature sensing cable are connected with the signal processing unit and the terminal unit respectively, wherein the N first core wires and the at least one third core wire form a plurality of closed loops.
[0016] The at least two second core wires form a temperature compensation loop.
[0017] Optionally, the signal processing unit comprises a micro control unit and N+1 filter amplification units, and the terminal unit comprises a terminal resistor.
[0018] One end of the N first core wires is connected with the input end of the N filter amplification units and a first power signal respectively, the other end of the N first core wires is connected with one end of the terminal resistor correspondingly, the other end of the terminal resistor is connected with one end of the third core wire, and the other end of the third core wire is connected with a second power signal; the filter amplification unit is used for signal filtering and amplifying the voltage signal of the first core wire.
[0019] One end of the second core wire is connected with the input end of one filter amplification unit and a first power signal, and the other end of the second core wire is connected with one end of the terminal resistor correspondingly.
[0020] The micro control unit is connected with the output end of the filter amplification unit.
[0021] The linear temperature sensing cable provided by the utility model comprises an outer sheath, N first core wires, at least two second core wires and at least one third core wire in the outer sheath, the first core wire, the second core wire and the third core wire all comprise a conductor body, wherein the first core wire further comprises a temperature characteristic material layer wrapped on the surface of the conductor body and a first insulating material layer wrapped on the surface of the temperature characteristic material layer, and the first insulating material layers of adjacent first core wires are staggered and arranged in the same direction in sequence, and the second core wire further comprises a second insulating material layer wrapped on the surface of the conductor body. The first insulating material layer is arranged at intervals to change the effective area of the first core wire for temperature sensing. In the case that the effective area of the first core wire is not changed, the actual length of the first core wire is increased, and the signal fluctuation caused by the reasonable change of external temperature when the length of the temperature sensing cable is increased is avoided. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1The utility model provides a cross section structure schematic drawing of linear temperature sensing cable for the embodiment of the utility model,
[0023] Figure 2 The utility model provides a cross section structure schematic drawing of linear temperature sensing cable for another embodiment of the utility model,
[0024] Figure 3 The utility model provides a structure schematic drawing of first core wire for the embodiment of the utility model,
[0025] Figure 4 The utility model provides a structure schematic drawing of first core wire for another embodiment of the utility model,
[0026] Figure 5 The utility model provides a structure schematic drawing of cable type linear temperature sensing fire detector for the embodiment of the utility model,
[0027] Figure 6 The utility model provides a circuit schematic drawing of cable type linear temperature sensing fire detector structure for the embodiment of the utility model. DETAILED DESCRIPTION
[0028] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in conjunction with the drawings in the embodiments of the utility model below, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor fall within the protection scope of the utility model.
[0029] At present, the maximum use length of temperature sensing cable is generally 200m, because with the increase of cable length, the cable is more susceptible to temperature change interference, and normal amplitude change of external temperature will cause signal fluctuation, resulting in temperature measurement result fluctuation and false alarm problem caused by error. Due to length limitation, for the super-long cable tunnel, the wide area warehouse and other large places, it is difficult to achieve comprehensive and effective coverage, and it is easy to produce the blank area of detection, thereby increasing the potential risk of fire occurrence and spread.
[0030] Therefore, Figure 1 The utility model provides a cross section structure schematic drawing of linear temperature sensing cable for the embodiment of the utility model, referring to Figure 1 , comprising:
[0031] Outer sheath 110;
[0032] N first core wires 120, at least two second core wires 140 and at least one third core wire 130 arranged in the outer sheath 110, N is greater than 0 and is an integer;
[0033] The first core wire 120, the second core wire 140 and the third core wire 130 each comprise a conductor 100, wherein the first core wire 120 further comprises a temperature characteristic material layer 101 coated on the surface of the conductor 100, and a first insulating material layer 102 coated on the surface of the temperature characteristic material layer 101; the first insulating material layers 102 of adjacent first core wires 120 are staggered in the same direction in sequence; the second core wire 140 further comprises a second insulating material layer coated on the surface of the conductor 100.
[0034] Specifically, the outer sheath 110 coats the internal first core wire 120, the second core wire 140 and the third core wire 130. The outer sheath 110 can be an insulating material, which is used to protect the temperature sensing cable from external stress damage, and at the same time improve the flexibility of the temperature sensing cable. According to the measurement environment of the temperature sensing cable, the number of the first core wire 120 can be 2, 3, 4, … or N, etc. The first core wire 120 is a functional core wire of the temperature sensing cable, which is used to sense the temperature of the protected object. The first core wire 120 comprises a conductor 100, and a temperature characteristic material layer 101 coated on the conductor 100. When the temperature changes, the resistance characteristic of the temperature characteristic material layer 101 also changes. For example, the temperature characteristic material layer 101 can be a thermosensitive material layer, for example, the material of the thermosensitive material layer is selected to be a negative temperature coefficient thermosensitive material, which can reduce the resistivity with the increase of temperature when the temperature changes. The first insulating material layer 102 is coated on the surface of the temperature characteristic material layer 101 in intervals, and the first insulating material layer 102 does not change in resistivity when the temperature changes. Therefore, by arranging the first insulating material layer 102 in intervals, the effective area of the first core wire 120 for temperature sensing can be changed. Without changing the effective area of the first core wire 120, the actual length of the first core wire 120 will increase, for example, the effective area of the first core wire 120, i.e. the total length of the temperature characteristic material layer 101 not coated by the first insulating material layer 102 is 10m, and due to the interval arrangement of the first insulating material layer 102, the total length of the first core wire 120 can be greater than 10m. Thus, the length of the temperature sensing cable is increased, and the signal fluctuation caused by the reasonable change of external temperature is avoided.
[0035] For example, Figure 2The utility model provides a cross section structure schematic drawing of linear temperature sensing cable, first insulating material layer 102 interval setting is in the surface of temperature characteristic material layer 101, the interval length size between first insulating material layer 102 is L1, the length size of exposed temperature characteristic material layer 101 is L1, the length size of first insulating material layer 102 is L2, under the condition that the effective area of first core wire 120 is not changed, the actual length of first core wire 120 will increase. In parallelly arranged first core wire 120, the first insulating material layer 102 of first core wire 120 is staggered in sequence along the same direction, for example, the first insulating material layer 102 of adjacent first core wire 120 is staggered in sequence to first direction X and forms staggered setting, wherein the first insulating material layer 102 of adjacent first core wire 120 has at least partial overlapping position in the longitudinal position, when having at least partial overlapping position, the length size L2 of first insulating material layer 102 is greater than the length size L1 of temperature characteristic material layer 101, as shown in Figure 2
[0036] Figure 3 The utility model provides a structure schematic drawing of first core wire, refer to Figure 3 The first insulating material layer 102 of adjacent first core wire 120 can also be adjacent in the longitudinal position, when being adjacent, the length size L2 of first insulating material layer 102 is equal to the length size L1 of temperature characteristic material layer 101.
[0037] Figure 4 The utility model provides another structure schematic drawing of first core wire, refer to Figure 4 The first insulating material layer 102 of adjacent first core wire 120 does not have overlapping position in the longitudinal position, when not having overlapping position, the length size L2 of first insulating material layer 102 is less than the length size L1 of temperature characteristic material layer 101.
[0038] Need to explain that, Figures 1-4 The first core wire 120, second core wire 140 and third core wire 130 in
[0039] At least two second core wires 140 can be temperature compensation core wire, and second insulating material layer is covered on the surface of the conductor 100 of second core wire 140, and plays the role of insulation protection. At least two second core wires 140 and signal processing unit and terminal unit constitute temperature compensation closed loop.
[0040] The at least one third core wire 130 can be a common terminal, when the temperature sensing cable is connected between the signal processing unit and the terminal unit, the N first core wires 120 and the at least one third core wire 130 form a plurality of closed signal acquisition loops, when the temperature sensing cable is at an abnormal temperature, at least one of the N first core wires 120 generates an electrical signal change, and the signal processing unit can realize judging whether there is a temperature alarm according to the electrical signal change.
[0041] The linear temperature sensing cable provided by the embodiment of the utility model, including outer sheath 110, and N first core wire 120, at least two second core wire 140 and at least one third core wire 130 in outer sheath 110, first core wire 120, second core wire 140 and third core wire 130 all include conductor 100, wherein, first core wire 120 still include the temperature characteristic material layer 101 of cladding in the surface of conductor 100, and the first insulating material layer 102 of interval cladding in the surface of temperature characteristic material layer 101, the first insulating material layer 102 of adjacent first core wire 120 is staggered in turn along the same direction, second core wire 140 still include the second insulating material layer of cladding in the surface of conductor 100, by interval setting first insulating material layer 102 can change the effective area of temperature sensing of first core wire 120, in the case where not changing the effective area of first core wire 120, increase the actual length of first core wire 120, and avoid increasing the length of temperature sensing cable, and the signal fluctuation caused by the reasonable change of external temperature.
[0042] Optionally, referring to Figure 2 、 Figure 3 and Figure 4 , the interval distance between the first insulating material layers 102 on the first core wire 120 is the same, so that the processing technology complexity of the first core wire 120 is reduced in the process, the first insulating material layers 102 are arranged at equal intervals, the exposed temperature characteristic material layers 101 have the same size, and the heated length of the temperature sensing cable is convenient to determine.
[0043] For example, optionally, the length size L1 of the first insulating material layer 102 is greater than or equal to the length size of the interval between the first insulating material layers 102, that is, the length size L1 of the first insulating material layer 102 is greater than or equal to the length size L2 of the exposed temperature characteristic material layer 101, and continuing to refer to Figure 2, the first insulation material layer 102 of the adjacent first core wire 120 is staggered by being offset to the first direction X in sequence, wherein the first insulation material layer 102 of the adjacent first core wire 120 is at least partially overlapped in the longitudinal position, that is, the length dimension L2 of the first insulation material layer 102 is greater than the length dimension L1 of the temperature characteristic material layer 101, therefore, when only one electric signal changes, the signal processing unit receives that, due to the interval arrangement of the first insulation material layer 102, there is temperature change in the length dimension L1 range of the temperature characteristic material layer 101 of a certain section of one first core wire 120, so that it can be judged that the heated length of the temperature sensing cable is at least one L1 length range. When only two electric signals change, due to the interval arrangement of the first insulation material layer 102, it can be explained that there is temperature change in the length dimension L1 range of the temperature characteristic material layer 101 of a certain section of two first core wires 120, so that it can be judged that the heated length of the temperature sensing cable is at least two L1 length range. For example, in the embodiment of the utility model, the length dimension L2 of the first insulation material layer 102 is twice the length dimension L1 of the temperature characteristic material layer 101, the first insulation material layer 102 of the adjacent first core wire 120 is staggered by being offset to the first direction X in sequence by one length dimension L1 of the temperature characteristic material layer 101, and the temperature characteristic material layer 101 exposed by the first core wire 120 is overlapped with the first insulation material layer 102 of the adjacent first core wire 120 in position, that is, it can be ensured that the heated length can be analyzed according to the length dimension L1 of the temperature characteristic material layer 101 each time. It should be noted that the length ratio of the length dimension L2 of the first insulation material layer 102 and the length dimension L1 of the temperature characteristic material layer 101 can also be other ratios according to needs, and the temperature characteristic material layer 101 exposed by the first core wire 120 is overlapped with the first insulation material layer 102 of the adjacent first core wire 120 in position.
[0044] Similarly, continuing to refer to Figure 3, the first insulation material layer 102 of the adjacent first core wire 120 is sequentially offset to the first direction X to form staggered arrangement, wherein the first insulation material layer 102 of the adjacent first core wire 120 is arranged adjacent in the position of the longitudinal direction, that is, the length dimension L2 of the first insulation material layer 102 is equal to the length dimension L1 of the temperature characteristic material layer 101, therefore, when only one electric signal changes, the signal processing unit receives that due to the interval arrangement of the first insulation material layer 102, it can be explained that there is temperature change in the length dimension L1 range of the temperature characteristic material layer 101 of a certain section of the first core wire 120, so that it can be judged that the heated length of the temperature sensing cable is maximum in the length range of one L1. When only two electric signals change, due to the interval arrangement of the first insulation material layer 102, it can be explained that there is temperature change in the length dimension L1 range of the temperature characteristic material layer 101 of a certain section of the two first core wires 120, so that it can be judged that the heated length of the temperature sensing cable is maximum in the length range of two L1.
[0045] Based on the above embodiment, the temperature sensing cable implemented by the utility model can reduce performance attenuation and improve alarm accuracy compared with ordinary cables under the same use length and the same heated length. For example, the total length of the first core wire 120 is 10m, the length dimension L1 of the temperature characteristic material layer 101 is 1m, and the heated length of the ordinary cable and the temperature sensing cable in the embodiment of the utility model is 2m, the temperature sensing cable in the embodiment of the utility model is detected by two length dimensions L1 of the temperature characteristic material layer 101, while the ordinary cable is detected by one 2m temperature characteristic material layer 101, the shorter the sensing length of the temperature characteristic material layer 101 used in the detection process, the smaller the performance attenuation generated, and the smaller the corresponding detection error and detection fluctuation, therefore, under the same use length and heated length, the performance attenuation can be reduced and the alarm accuracy can be improved.
[0046] Optionally, the third core wire 130 further comprises a temperature characteristic material layer 101 wrapped on the surface of the conductor 100. The third core wire 130 as a common end can improve the resistance of the whole signal acquisition loop by arranging the temperature characteristic material layer 101, which is conducive to reducing electromagnetic interference on the core wire to ensure the stability of signal transmission.
[0047] Optionally, referring to Figure 1 and Figure 2 , the linear temperature sensing cable further comprises a conductive layer sleeve 150 arranged along the inner wall of the outer sheath 110, and the first core wire 120, the second core wire 140 and the third core wire 130 are arranged in the conductive layer sleeve 150.
[0048] Specifically, the first core wire 120, the second core wire 140 and the third core wire 130 can be arranged in parallel or twisted or wound in one body, and then wound by the conductive layer sleeve 150. The conductive layer sleeve 150 can be intermittently wound during the winding process. For example, two first core wires 120 are taken as an example. The conductive layer sleeve 150 passes through the temperature characteristic material layer 101 of the first first core wire 120 and the first insulating material layer 102 of the second first core wire 120, and the temperature characteristic material layer 101 of the second first core wire 120 and the first insulating material layer 102 of the first first core wire 120 during the winding process. The temperature characteristic material layer 101 of the first first core wire 120 corresponds to the insulating part of the first insulating material layer 102 of the second first core wire 120 as a conductive part, and the temperature characteristic material layer 101 of the second first core wire 120 corresponds to the insulating part of the first insulating material layer 102 of the first first core wire 120 as a conductive part, which are complementary in position, so that the shielding effect is better realized by the conductive layer sleeve 150, the external interference is reduced, and the stability of the characteristic impedance is maintained. The conductive layer sleeve 150 further improves the bending performance and tensile capacity of the temperature sensing cable. In the temperature sensing cable, the conductive layer sleeve 150 also increases the conductive contact area between the temperature characteristic material layers 101 of the first core wires 120, which helps to achieve the performance index of shortening the standard alarm length.
[0049] Figure 5 A schematic diagram of a cable type linear temperature sensing fire detector structure is provided for the embodiment of the utility model, see Figure 5 , comprising a signal processing unit 510, a terminal unit 520 and any linear temperature sensing cable 530 of the embodiment of the utility model;
[0050] The two ends of the linear temperature sensing cable 530 are connected with the signal processing unit 510 and the terminal unit 520 respectively; wherein N first core wires 120 and at least one third core wire 130 constitute a plurality of closed loops;
[0051] At least two second core wires 140 constitute a temperature compensation loop.
[0052] Specifically, the temperature sensing cable 530 is connected between the signal processing unit 510 and the terminal unit 520, and at least two second core wires 140 constitute a temperature compensation loop with the signal processing unit 510 and the terminal unit 520. At least one third core wire 130 can be a common end, and N first core wires 120 and at least one third core wire 130 constitute a plurality of closed signal acquisition loops. When the temperature sensing cable 530 is at an abnormal temperature, at least one of the N first core wires 120 will produce an electrical signal change, and the signal processing unit 510 can realize the judgment of temperature alarm according to the electrical signal change.
[0053] Figure 6 The utility model provides a kind of circuit schematic diagram of cable type linear temperature sensing fire detector structure for the utility model embodiment, refer to Figure 6 Optionally, the signal processing unit 510 includes a microcontroller unit and N+1 filter amplification units 512; the terminal unit 520 includes a terminal resistor;
[0054] One end of the N first core wires 120 is respectively connected to the input end of the N filter amplification units and the first first power signal VDD, and the other end of the N first core wires 120 is connected to one end of a terminal resistor, the other end of the terminal resistor is connected to one end of the third core wire 130, and the other end of the third core wire 130 is connected to the second power signal; the filter amplification unit is used for signal filtering and amplifying the voltage signal of the first core wire 120;
[0055] One end of the second core wire 140 is connected to the input end of a filter amplification unit and the first power signal, and the other end of the second core wire 140 is connected to one end of a terminal resistor;
[0056] The microcontroller unit is connected to the output end of the filter amplification unit.
[0057] Specifically, the external power supply can provide the first power signal VDD to power the cable type linear temperature sensing fire detector structure. The second power signal can be a signal negative pole, such as a ground signal. The third core wire 130 serves as a common terminal, one end of each first core wire 120 is connected to the first power signal VDD, and the other end is connected to a terminal resistor. Here, the terminal resistors connected to the first core wires 120 are respectively denoted as R1, R2, …, RN.
[0058] The third core wire 130 is grounded to form N signal acquisition loops. The input end of each filter amplification unit is connected to the acquisition node of each first core wire 120, denoted as S1, S2, …, SN. One end of a second core wire 140 is connected to the first power signal VDD, and the other end is connected to a terminal resistor, which can be denoted as Rb1. Another second core wire 140 is grounded to form a temperature compensation loop. The temperature compensation loop is used to provide a reference signal of the external environment temperature. It should be noted that the resistance of the terminal resistor b1 connected to the second core wire and the terminal resistors R1, R2, …, RN connected to the first core wires can be different, and the resistance of the terminal resistors R1, R2, …, RN connected to the first core wires can also be different, which is not limited here.
[0059] The input end of a signal filter amplification unit is connected to the acquisition node of the second core wire 140, denoted as Sb1. The signal filter amplification unit is used for signal filtering and signal amplifying the acquired voltage signal. For example, the signal filter amplification unit includes an operational amplifier unit 5121, a first signal filter unit 5122, a signal amplification unit 5123, and a second signal filter unit 5124.
[0060] After the temperature sensing cable 530 is connected, the connection status of the temperature sensing cable 530 can be detected, i.e., initialization detection. For example, the microcontroller unit can collect the signals of nodes S1, S2...SN and Sb1, which are then passed through the operational amplifier unit 5121, the first signal filtering unit 5122, and then amplified by the signal amplification unit 5123. After passing through the second signal filtering unit 5124, the data D1, D2...DSN and DSb1 are obtained. At the same time, the microcontroller unit modulates the DSb1 data through the digital-to-analog converter 513 (Digital-to-Analog Converter, DAC) to obtain the reference signal of the external ambient temperature. By comparing the data of each first core wire 120 with the reference signal, for example, if the difference between the two is within the normal range, it can be determined that the data of D1, D2...DSN are within the normal range, which means that the signal acquisition circuit of each first core wire 120 is normal and there is no short circuit or open circuit.
[0061] In practical applications, the microcontroller unit can acquire signals from nodes S1, S2...SN and Sb1. After passing through the operational amplifier unit 5121, the signals are filtered by the first signal filtering unit 5122, amplified by the signal amplification unit 5123, and then filtered by the second signal filtering unit 5124 to obtain data D1[t], D2[t]...DSN[t] and DSb1[t]. The microcontroller unit compares the data D1, D2...DSN and DSb1 with the data D1[t], D2[t]...DSN[t] and DSb1[t]. The difference between D1[t] and D1 is stored as △D1, the difference between D2[t] and D2 is stored as △D2, the difference between DSN[t] and DSN is stored as △DSN, and the difference between DSb1[t] and DSb1 is stored as △DSb1. The microcontroller can compare the calculated data △D1, △D2...△DSN with the preset △D data of the microcontroller and process the ratio to K1, K2...KN. Based on the magnitude and distribution range of the K value, the heating length of the 530 temperature sensing cable can be fuzzily inferred.
[0062] For example, with Figure 2 Taking the medium-temperature sensing cable 530 as an example, when it is not heated, the difference between the data D1[t], D2[t]...DSN[t] and DSb1[t] obtained by the microcontroller and the data D1, D2...DSN and DSb1 is less than or equal to the preset ΔD.
[0063] If the temperature sensing cable 530 is heated, the micro control unit obtains the difference △D1 between the data D1[t] and the data D1, and if the difference △D1 is greater than the preset △D, it indicates that the temperature characteristic material layer 101 of the first first core is heated, and the resistivity of the temperature characteristic material layer 101 decreases with the increase of temperature, so the resistance of the first first core decreases, and the voltage value of the first first core is less than the initial voltage value of the first first core. The difference △D1 between the data D1[t] and the data D1 is compared with the preset △D to obtain K1, and since there is only one group of difference, the length of the first first core corresponding to the length L1 of the temperature characteristic material layer 101 can be inferred.
[0064] If the temperature sensing cable 530 is heated, the micro control unit obtains the difference △D1 between the data D1[t] and the data D1, and if the difference △D1 is greater than the preset △D, it indicates that the temperature characteristic material layer 101 of the first first core is heated, and the resistivity of the temperature characteristic material layer 101 decreases with the increase of temperature, so the resistance of the first first core decreases, and the voltage value of the first first core is less than the initial voltage value of the first first core. The difference △D1 between the data D1[t] and the data D1 is compared with the preset △D to obtain K1, and since there is only one group of difference, the length of the first first core corresponding to the length L1 of the temperature characteristic material layer 101 can be inferred.
[0065] Table 1 is a heating length table of the temperature sensing cable 530
[0066]
[0067] According to Table 1, when there is one group of difference, the length of the temperature sensing cable 530 corresponding to the length L1 of the temperature characteristic material layer 101 can be inferred. When there are two groups of differences, the length of the temperature sensing cable 530 corresponding to the length L1 of the two temperature characteristic material layers 101 can be inferred. When there are N-1 groups of differences, the length of the temperature sensing cable 530 corresponding to the length L1 of at least N-1 temperature characteristic material layers 101 can be inferred. When there are N groups of differences, the length of the temperature sensing cable 530 corresponding to the length L1 of at least N temperature characteristic material layers 101 can be inferred.
[0068] Finally, it should be pointed out that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions described in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not change the essence of the corresponding technical solutions beyond the spirit and scope of the technical solutions of the embodiments of the present application.
Claims
1. A linear heat-sensing cable, characterized in that, The cable comprises: an outer sheath; N first core wires, at least two second core wires and at least one third core wire arranged in the outer sheath; N is greater than 0 and is an integer; the first core wire, the second core wire and the third core wire each comprise an electrically conductive body, wherein the first core wire further comprises a temperature characteristic material layer wrapped on the surface of the electrically conductive body, and a first insulating material layer wrapped on the surface of the temperature characteristic material layer; the first insulating material layers of adjacent first core wires are staggered in the same direction in sequence; the second core wire further comprises a second insulating material layer wrapped on the surface of the electrically conductive body.
2. The linear heat sensing cable of claim 1, wherein, The spacing distance between the first insulating material layers on the first core wire is the same.
3. The linear heat sensing cable of claim 2, wherein, The length dimension of the first insulating material layer is greater than or equal to the length dimension of the spacing between the first insulating material layers.
4. The linear heat sensing cable of claim 3, wherein, The third core wire further comprises a temperature characteristic material layer wrapped on the surface of the electrically conductive body.
5. The linear heat sensing cable according to any one of claims 1-4, characterized in that, Further comprising a conductive layer sleeve arranged along the inner wall of the outer sheath, and the first core wire, the second core wire and the third core wire are arranged in the conductive layer sleeve.
6. The linear heat sensing cable according to any one of claims 1 to 4, characterized in that, The temperature characteristic material layer is a thermosensitive material layer.
7. A cable linear heat detection fire detector arrangement, characterised in that, The cable comprises a signal processing unit, a terminal unit and the linear temperature sensing cable according to any one of claims 1-6. The two ends of the linear temperature sensing cable are respectively connected with the signal processing unit and the terminal unit; wherein the N first core wires and the at least one third core wire form a plurality of closed loops; The at least two second core wires form a temperature compensation loop.
8. The cable linear heat detection fire detector structure of claim 7, wherein, The signal processing unit comprises a micro control unit and N+1 filter amplification units; the terminal unit comprises a terminal resistor; One end of the N first core wires is respectively connected with the input end of N filter amplification units and a first power signal, the other end of the N first core wires is respectively connected with one end of the terminal resistor, the other end of the terminal resistor is connected with one end of the third core wire, the other end of the third core wire is connected with a second power signal; the filter amplification unit is used for signal filtering and amplifying the voltage signal of the first core wire; One end of the second core wire is connected with the input end of a filter amplification unit and a first power signal, the other end of the second core wire is connected with one end of a terminal resistor; The micro control unit is connected with the output end of the filter amplification unit.