Temperature sensing cable, fire alarm method, and fire alarm system

Abstract

This invention provides a temperature-sensing cable, wherein the controller in the temperature-sensing control unit can sense nearby temperature changes through a first temperature acquisition circuit and a second temperature acquisition circuit, and issue a high-temperature warning (or fire warning) by outputting a warning signal. The warning signal can carry the address information of the controller. By determining the location of the controller that issued the warning signal, the high-temperature point (or ignition point) can be accurately located. This invention also provides a fire alarm method and a fire alarm system based on the above-mentioned temperature-sensing cable. By performing a composite judgment on the temperature field data information of multiple related temperature-sensing control units, false alarms can be reduced, especially those caused by electromagnetic interference, humid environments, construction pressure, and localized rapid heating.

Description

[0001] This application is a divisional application of Chinese patent application filed on May 6, 2024, with patent application number CN202410550993.3 and invention title “A temperature sensing cable, fire alarm method and fire alarm system”. Technical Field

[0002] This invention relates to the field of fire protection technology, and in particular to a temperature-sensing cable, a fire alarm method, and a fire alarm system. Background Technology

[0003] Temperature-sensing cables, also known as linear temperature-sensing fire detectors, are fire detectors that respond to the ambient temperature of a continuous circuit. Temperature-sensing cables are divided into two categories: resettable and non-resettable. Non-resettable temperature-sensing cables consist of two conductors insulated with a temperature-sensitive material. When the ambient temperature rises to a predetermined operating temperature, the temperature-sensitive material breaks, causing a short circuit between the two conductors and generating an alarm signal. Resettable temperature-sensing cables, also known as analog temperature-sensing cables, have resistance that changes with temperature. When the resistance change reaches a set alarm threshold, the detector emits an alarm signal. While these temperature-sensing cables can be used to monitor the operating temperature of power cables and issue an alarm signal when the temperature at a certain point on the power cable is too high, they cannot accurately pinpoint the high-temperature point. Furthermore, these temperature-sensing cables generally have poor moisture resistance and electromagnetic interference resistance. When used to monitor power cables, they frequently cause false alarms due to electromagnetic interference and / or moisture (power cable installation sites typically have high electromagnetic interference and / or humidity).

[0004] The content of the background section is merely the technology known to the inventor and does not necessarily represent the prior art in this field. Summary of the Invention

[0005] To address one or more deficiencies in the prior art, the present invention provides a temperature-sensing cable, comprising:

[0006] Power signal multiplexing cable;

[0007] Multiple temperature-sensing wires are spaced apart along the length of the power signal multiplexing cable. Each temperature-sensing wire includes a first conductor, a second conductor, and a temperature-sensing material. The temperature-sensing material is connected between the first conductor and the second conductor. The temperature-sensing material is a conductor, and its resistance changes with temperature.

[0008] Multiple temperature sensing control units are provided, each including a controller and a first temperature acquisition circuit. The multiple temperature sensing control units are electrically connected between adjacent temperature sensing lines. Adjacent temperature sensing control units and the temperature sensing lines located between them constitute a second temperature acquisition circuit. The controller is coupled to the power signal multiplexing cable, the first temperature acquisition circuit, and the second temperature acquisition circuit, respectively. The controller is configured to receive and / or transmit signals via the power signal multiplexing cable. The controller is configured to output a warning signal based on a first analog quantity from the first temperature acquisition circuit and / or a second analog quantity from the second temperature acquisition circuit, wherein both the first analog quantity and the second analog quantity change with temperature.

[0009] According to one aspect of the invention, the controller is configured to:

[0010] When the first analog quantity reaches the first warning threshold and the second analog quantity is in the first warning interval, a warning signal is output; and / or,

[0011] When the rate of change of the first analog quantity reaches the second warning threshold, and the rate of change of the second analog quantity is within the second warning interval, a warning signal is output; and / or,

[0012] When the rate of change of the second analog quantity reaches the third warning threshold, a warning signal is output.

[0013] According to one aspect of the present invention, the first temperature acquisition circuit includes a first resistor and a second resistor connected in series, wherein the first resistor is a thermistor, and an acquisition node is provided between the first resistor and the second resistor;

[0014] The controller includes a power port and a first acquisition port, wherein the first temperature acquisition circuit is coupled between the power port and ground, the first acquisition port is coupled to the acquisition node, and the controller is configured to acquire a first voltage signal through the first acquisition port and use the first voltage signal as the first analog quantity.

[0015] According to one aspect of the present invention, the temperature sensing control unit further includes a third resistor, a fourth resistor, a fifth resistor, and a differential circuit, wherein the third resistor is coupled between the upstream end of the first wire and the upstream end of the second wire, the fourth resistor is coupled between the power supply port and the downstream end of the first wire, the fifth resistor is coupled between the downstream end of the second wire and ground, and the differential circuit has two input terminals, one of which is coupled to the downstream end of the first wire and the other input terminal is coupled to the downstream end of the second wire;

[0016] The controller is configured to receive the output signal of the differential circuit and use it as the second analog quantity.

[0017] According to one aspect of the invention, the differential circuit is integrated into the controller.

[0018] According to one aspect of the invention, the temperature sensing control unit further includes a voltage regulator capacitor, one electrode of which is grounded and the other electrode is coupled to the power supply port.

[0019] According to one aspect of the invention, the power signal multiplexing cable includes a third conductor and a fourth conductor;

[0020] The controller includes a power supply port and a data port;

[0021] The temperature sensing control unit includes a first filtering circuit, which is coupled to the third wire, the power supply port and the data port respectively. The first filtering circuit is configured to provide the controller with a stable power supply and amplitude limiting and width limiting signals in conjunction with the power signal multiplexing cable.

[0022] According to one aspect of the present invention, the first filtering circuit includes a sixth resistor, a filtering capacitor, and a noise reduction and bleedering device, wherein the sixth resistor is connected between the third conductor and the power supply port; one electrode of the filtering capacitor is grounded, and the other electrode is coupled between the sixth resistor and the power supply port; the noise reduction and bleedering device has a built-in spike discharge circuit, and the noise reduction and bleedering device is connected between the third conductor and the data port.

[0023] According to one aspect of the invention, the temperature sensing control unit further includes a first diode connected between the third wire and the first filter circuit, the first diode being configured to allow current to flow from the third wire to the first filter circuit.

[0024] According to one aspect of the invention, the controller incorporates a second filtering circuit, which is coupled to the data port, and the second filtering circuit is configured to filter out interference signals.

[0025] According to one aspect of the present invention, the temperature sensing cable further includes an insulation layer, the power signal multiplexing cable and the temperature sensing wire are embedded in the insulation layer, the insulation layer is provided with a plurality of mounting holes, and the temperature sensing control unit is disposed in the mounting holes; an insulating protective layer is provided over the insulation layer, and the insulating protective layer is disposed along the entire length of the temperature sensing cable.

[0026] The present invention also provides a fire alarm method based on the temperature sensing cable described above, the fire alarm method comprising:

[0027] Based on the warning signal, multiple relevant temperature sensing control units are identified;

[0028] Collect temperature field data information for each of the relevant temperature sensing and control units. The temperature field data information includes a first analog quantity, the rate of change of the first analog quantity, a second analog quantity, and the rate of change of the second analog quantity.

[0029] Based on the temperature field data information from the multiple related temperature sensing and control units, determine whether to trigger a fire alarm.

[0030] According to one aspect of the present invention, the step of determining a plurality of relevant temperature sensing control units based on the warning signal includes:

[0031] Based on the warning signal, determine the temperature sensing control unit that issued the warning signal;

[0032] The temperature control unit that issued the warning signal and several nearby temperature control units are designated as relevant temperature control units.

[0033] According to one aspect of the present invention, the step of confirming whether to issue a fire alarm based on the temperature field data information of the plurality of related temperature sensing control units includes:

[0034] The first element is determined based on the first analog value of the plurality of related temperature sensing control units;

[0035] The second element is determined based on the rate of change of the first analog quantity of the multiple related temperature sensing control units;

[0036] The third element is determined based on the second analog value of the plurality of related temperature sensing control units;

[0037] The fourth element is determined based on the rate of change of the second analog quantity of the multiple related temperature sensing control units;

[0038] Based on the preset weight coefficients of the first element, the second element, the third element, and the fourth element, the first element, the second element, the third element, and the fourth element are weighted and merged to obtain the fifth element.

[0039] If the fifth element is greater than the alarm threshold, a fire alarm will be triggered;

[0040] Otherwise, the fire alarm will not be triggered.

[0041] According to one aspect of the invention, the first element A is determined according to the following formula:

[0042]

[0043] Where n is the number of relevant temperature sensing control units, M iR1 is the first analog quantity of the i-th related temperature sensing control unit among the plurality of related temperature sensing control units, M i-1 R1 is the first analog quantity of the (i-1)th related temperature sensing control unit among the plurality of related temperature sensing control units.

[0044] According to one aspect of the invention, the second element is the number of the rate of change of a first analog quantity of a relevant temperature sensing control unit that exceeds a preset threshold.

[0045] According to one aspect of the invention, the third element C is determined according to the following formula:

[0046]

[0047] Where n is the number of relevant temperature sensing control units, M i R a M represents the second analog quantity of the i-th related temperature sensing control unit among the plurality of related temperature sensing control units. i-1 R a M is the second analog quantity of the (i-1)th correlated temperature sensing control unit among the plurality of correlated temperature sensing control units. n This serves as an environmental benchmark.

[0048] According to one aspect of the invention, the fourth element D is determined according to the following formula:

[0049]

[0050] Where n is the number of relevant temperature sensing control units, M i R a / T represents the rate of change of the second analog quantity of the i-th related temperature sensing control unit among the plurality of related temperature sensing control units.

[0051] The present invention also provides a fire alarm system, comprising:

[0052] The temperature-sensing cable as described above;

[0053] A terminal box is connected to the end of the temperature-sensing cable;

[0054] A signal processing unit is connected to the front end of the temperature sensing cable, and the signal processing unit is configured to:

[0055] Based on the warning signal, multiple relevant temperature sensing control units are identified;

[0056] Collect temperature field data information for each of the relevant temperature sensing and control units. The temperature field data information includes a first analog quantity, the rate of change of the first analog quantity, a second analog quantity, and the rate of change of the second analog quantity.

[0057] Based on the temperature field data information from the multiple related temperature sensing and control units, determine whether to trigger a fire alarm.

[0058] According to one aspect of the invention, the signal processing unit is configured to:

[0059] Based on the warning signal, determine the temperature sensing control unit that issued the warning signal;

[0060] The temperature control unit that issued the warning signal and several nearby temperature control units are designated as relevant temperature control units.

[0061] According to one aspect of the invention, the signal processing unit is configured to:

[0062] The first element is determined based on the first analog value of the plurality of related temperature sensing control units;

[0063] The second element is determined based on the rate of change of the first analog quantity of the multiple related temperature sensing control units;

[0064] The third element is determined based on the second analog value of the plurality of related temperature sensing control units;

[0065] The fourth element is determined based on the rate of change of the second analog quantity of the multiple related temperature sensing control units;

[0066] Based on the preset weight coefficients of the first element, the second element, the third element, and the fourth element, the first element, the second element, the third element, and the fourth element are weighted and merged to obtain the fifth element.

[0067] If the fifth element is greater than the alarm threshold, a fire alarm will be triggered;

[0068] Otherwise, the fire alarm will not be triggered.

[0069] According to one aspect of the invention, the signal processing unit is configured to determine the first element A according to the following formula:

[0070]

[0071] Where n is the number of relevant temperature sensing control units, M i R1 is the first analog quantity of the i-th related temperature sensing control unit among the plurality of related temperature sensing control units, M i-1 R1 is the first analog quantity of the (i-1)th related temperature sensing control unit among the plurality of related temperature sensing control units.

[0072] According to one aspect of the invention, the second element is the number of the rate of change of a first analog quantity of a relevant temperature sensing control unit that exceeds a preset threshold.

[0073] According to one aspect of the invention, the signal processing unit is configured to determine the third element C according to the following formula:

[0074]

[0075] Where n is the number of relevant temperature sensing control units, M i R2 is the second analog quantity of the i-th related temperature sensing control unit among the plurality of related temperature sensing control units, M i-1 R2 is the second analog quantity of the (i-1)th related temperature sensing control unit among the plurality of related temperature sensing control units, M n This serves as an environmental benchmark.

[0076] According to one aspect of the invention, the signal processing unit is configured to determine the fourth element D according to the following formula:

[0077]

[0078] Where n is the number of relevant temperature sensing control units, M i R a / T represents the rate of change of the second analog quantity of the i-th related temperature sensing control unit among the plurality of related temperature sensing control units.

[0079] Compared with the prior art, embodiments of the present invention provide a temperature-sensing cable, wherein the controller in the temperature-sensing control unit can sense nearby temperature changes through a first temperature acquisition circuit and a second temperature acquisition circuit, and issue a high-temperature warning (or fire warning) by outputting a warning signal. The warning signal can carry the address information of the controller. By determining the location of the controller that issued the warning signal, the high-temperature point (or ignition point) can be accurately located. The first filtering circuit and the power signal multiplexing cable can provide the controller with a stable power supply and a signal with limited amplitude and width. By embedding the second filtering circuit in the controller, interference signals can be filtered out, improving the electromagnetic interference resistance of the temperature-sensing cable. By embedding the power signal multiplexing cable and the temperature sensing wire in the insulation layer, and placing the temperature-sensing control unit in the mounting hole on the insulation layer and covering the mounting hole with an insulating protective layer, the moisture resistance of the temperature-sensing cable can be improved.

[0080] Embodiments of the present invention also provide a fire alarm method and a fire alarm system, which are implemented based on the above-mentioned temperature sensing cable. By performing a composite judgment on the temperature field data information of multiple related temperature sensing control units, false alarms can be reduced, especially those caused by electromagnetic interference, humid environment, construction pressure, local rapid heating and other factors. Attached Figure Description

[0081] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0082] Figure 1 A schematic diagram of a temperature-sensing cable according to an embodiment of the present invention is shown;

[0083] Figure 2 It shows Figure 1 A magnified view of the central area;

[0084] Figure 3 A schematic diagram of a temperature-sensing cable according to an embodiment of the present invention is shown;

[0085] Figure 4 A flowchart of a fire alarm method according to an embodiment of the present invention is shown;

[0086] Figure 5 A schematic diagram of a fire alarm system according to an embodiment of the present invention is shown. Detailed Implementation

[0087] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0088] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0089] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0090] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0091] The following disclosure provides many different embodiments or examples for implementing various structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. These are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed. In addition, examples of various specific processes and materials are provided in this invention, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0092] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0093] Figure 1 A schematic diagram of a temperature-sensing cable 100 according to an embodiment of the present invention is shown. Figure 2 It shows Figure 1 Enlarged view of the middle section, Figure 3 A schematic diagram of a temperature-sensing cable 100 according to an embodiment of the present invention is shown below, in conjunction with... Figures 1 to 3 Provide a detailed description.

[0094] like Figures 1 to 3As shown, the temperature-sensing cable 100 includes a power signal multiplexed cable 110, a temperature-sensing wire 120, and a temperature-sensing control unit 130. The power signal multiplexed cable 110 extends along a first direction and can be used to provide power and data communication for the temperature-sensing control unit 130. Multiple temperature-sensing wires 120 and multiple temperature-sensing control units 130 are respectively arranged alternately along the length of the power signal multiplexed cable 110, and multiple temperature-sensing control units 130 are electrically connected between adjacent temperature-sensing wires 120. That is, the temperature-sensing wires 120 and multiple temperature-sensing control units 130 are sequentially and alternately arranged and interconnected along the length of the power signal multiplexed cable 110. The temperature-sensing wire 120 includes a first conductor 121, a second conductor 122, and a temperature-sensing material Ra. The temperature-sensing material Ra is connected between the first conductor 121 and the second conductor 122. The temperature-sensing material Ra is a conductor, and its resistance changes with temperature (for example, the higher the temperature, the lower the resistance of the temperature-sensing material Ra). The temperature sensing control unit 130 includes a controller 131 and a first temperature acquisition circuit 132. Furthermore, adjacent temperature sensing control units 130 and the temperature sensing wire 120 located between them constitute a second temperature acquisition circuit 133. Both the first and second temperature acquisition circuits 132 and 133 can accurately monitor changes in ambient temperature. Specifically, the controller 131 is coupled to a power signal multiplexing cable 110, the first temperature acquisition circuit 132, and the second temperature acquisition circuit 133, respectively. The controller 131 is configured to receive and transmit signals via the power signal multiplexing cable 110. The controller 131 is also configured to obtain a first analog signal from the first temperature acquisition circuit 132 and a second analog signal from the second temperature acquisition circuit 133. The controller 131 is further configured to output a warning signal based on the first and / or second analog signals. Since both the first and second analog signals change with temperature, the warning signal accurately reflects temperature anomalies. By tracing the source of the warning signal, high-temperature locations or potential ignition points can be accurately located.

[0095] According to one embodiment of the present invention, such as Figure 1 and Figure 2As shown, controller 131 can be configured to output a warning signal when the first analog quantity reaches a first warning threshold and the second analog quantity is in a first warning interval. Controller 131 can also be configured to output a warning signal when the rate of change of the first analog quantity reaches a second warning threshold and the rate of change of the second analog quantity is in a second warning interval; wherein the rate of change of the first analog quantity is the change in the first analog quantity per unit time, and the rate of change of the second analog quantity is the change in the second analog quantity per unit time. Controller 131 can also be configured to output a warning signal when the rate of change of the second analog quantity reaches a third warning threshold. These configurations further enhance the warning capability of the temperature-sensing cable 100, enabling it to not only respond to the current temperature state but also provide warnings about temperature change trends, thus playing a crucial role in fire prevention and early detection.

[0096] According to one embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the first temperature acquisition circuit 132 may include a first resistor R1 and a second resistor R2 connected in series. A acquisition node is provided between the first resistor R1 and the second resistor R2, and the acquisition node is used to connect to the controller 131. The first resistor R1 may be a thermistor, whose resistance value changes with temperature; preferably, the first resistor R1 is a negative temperature coefficient thermistor, whose resistance value decreases as temperature increases. The controller 131 may be a system integrated circuit chip, which has a power port U1 and a first acquisition port AD1. The first temperature acquisition circuit 132 is coupled between the power port U1 and ground. The power port U1 can provide a stable voltage to the first temperature acquisition circuit 132. When the ambient temperature near the first temperature acquisition circuit 132 changes, the resistance value of the first resistor R1 changes, and correspondingly, the voltage value at the acquisition node also changes. The first acquisition port AD1 is coupled to the acquisition node in the first temperature acquisition circuit 132. The controller 131 is configured to obtain the voltage value (first voltage signal) at the acquisition node through the first acquisition port AD1 and use the first voltage signal as a first analog quantity.

[0097] According to one embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the temperature sensing control unit 130 also includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a differential circuit 1331. The third resistor R3, the fourth resistor R4, the fifth resistor R5, and the differential circuit 1331 can work with the temperature sensing wire 120 to form a second temperature acquisition circuit 133. Specifically, the third resistor R3 is coupled between the upstream end of the first wire 121 and the upstream end of the second wire 122 (in...). Figure 1 and Figure 2In the circuit diagram (with the left side as the upstream end and the right side as the downstream end), the second temperature acquisition circuit 133 is closed. A fourth resistor R4 is coupled between the power supply port U1 and the downstream end of the first wire 121. A fifth resistor R5 is coupled between the downstream end of the second wire 122 and ground. The differential circuit 1331 has two input terminals: one input terminal X is coupled to the downstream end of the first wire 121 to acquire the voltage value at the downstream end of the first wire 121; the other input terminal Y is coupled to the downstream end of the second wire 122 to acquire the voltage value at the downstream end of the second wire 122. The differential circuit 1331 can process these two voltage values ​​(the voltage value at the downstream end of the first wire 121 and the voltage value at the downstream end of the second wire 122) and output the difference between these two voltage values ​​at the output terminal. The power port U1 of the controller 131 can provide a stable voltage to the second temperature acquisition circuit 133. When the ambient temperature near the second temperature acquisition circuit 133 changes, the resistance value of the temperature-sensing material Ra changes, and correspondingly, the difference between the voltage value at the downstream end of the first wire 121 and the voltage value at the downstream end of the second wire 122 changes, that is, the voltage value at the output end of the differential circuit 1331 changes. The controller 131 can be configured to receive the output signal of the differential circuit 1331 (i.e., the voltage value at the output end of the differential circuit 1331) and use it as a second analog quantity. Preferably, the differential circuit 1331 can be integrated into the controller 131, and the controller 131 is configured with two acquisition ports as the two input terminals X and Y of the differential circuit 1331.

[0098] According to one embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the temperature sensing control unit 130 may further include a voltage regulator capacitor 134. One electrode of the voltage regulator capacitor 134 is grounded, and the other electrode is coupled to the power supply port U1 of the controller 131 (that is, coupled to the input terminals of the first resistor R1 and the fourth resistor R4, respectively). With this configuration, the voltage regulator capacitor 134 works in conjunction with the power supply port U1 of the controller 131 to provide a stable voltage supply to the first temperature acquisition circuit 132 and the second temperature acquisition circuit 133. Its advantage lies in effectively reducing noise caused by power fluctuations, thereby significantly reducing the risk of false alarms from the controller 131, improving the electromagnetic compatibility of the temperature sensing cable 100, and further ensuring the operational stability of the temperature sensing cable 100 in an electromagnetic interference environment.

[0099] According to one embodiment of the present invention, such as Figure 1 and Figure 2As shown, the controller 131 may include a power supply port U2 and a data port I / O. The power supply port U2 can be used to connect to an external power source, and the data port I / O can be used to receive external signals and also to output signals. The power signal multiplexing cable 110 includes a third conductor 111 and a fourth conductor 112. The temperature sensing control unit 130 includes a first filter circuit 135, which is coupled to the third conductor 111, the power supply port U2, and the data port I / O, respectively. The first filter circuit 135 is configured to work with the power signal multiplexing cable 110 to provide the controller 131 with a more stable power supply and a signal with limited amplitude and width, so as to effectively suppress noise and interference on the power line, prevent the signal from being too strong and causing damage or interference to the controller 131, and at the same time ensure the clarity and accuracy of the signal.

[0100] According to one embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the first filter circuit 135 may include a sixth resistor R6, a filter capacitor 136, and a noise reduction and discharge device 137. The sixth resistor R6 is connected between the third conductor 111 and the power supply port U2. One electrode of the filter capacitor 136 is grounded, and the other electrode is coupled between the sixth resistor R6 and the power supply port U2 (i.e., connected to the power supply port U2). By setting the filter capacitor 136, high-frequency noise on the power signal multiplexing cable 110 can be effectively filtered out, so as to provide a stable power supply for the controller 131. The noise reduction and discharge device 137 has a built-in spike discharge circuit, which is connected between the third conductor 111 and the data port I / O. Its function is to quickly discharge the spike voltage (i.e., limit the amplitude and width of the signal) without affecting the normal signal transmission, thereby protecting the controller 131 from damage by voltage spikes.

[0101] According to one embodiment of the present invention, such as Figure 1 and Figure 2 As shown, the controller 131 has a built-in second filter circuit (not shown in the figure). The second filter circuit can be coupled to the data port I / O. The second filter circuit can filter out interference signals and improve the electromagnetic interference resistance of the controller 131.

[0102] According to one embodiment of the present invention, such as Figure 1 and Figure 2As shown, the temperature sensing control unit 130 may further include a first diode 138, which is connected between the third wire 111 and the first filter circuit 135. The first diode 138 is configured to allow current to flow from the third wire 111 to the first filter circuit 135. Furthermore, the controller 131 also has a power ground interface U3, which is grounded and connected to a fourth wire 112 via a second diode 139. The second diode 139 is configured to prevent current from flowing from the fourth wire 112 to the power ground interface U3.

[0103] According to one embodiment of the present invention, such as Figure 3 As shown, the temperature-sensing cable 100 also includes an insulation layer 140. A power signal multiplexed cable 110 and a temperature-sensing wire 120 are embedded within the insulation layer 140. Multiple mounting holes 150 are spaced apart on the insulation layer 140, and the temperature-sensing control unit 130 is disposed in a corresponding mounting hole 150. An insulating protective layer 160 is also provided outside the insulation layer 140, extending along the entire length of the temperature-sensing cable 100. These features significantly improve the moisture-proof performance of the temperature-sensing cable 100 and reduce the possibility of false alarms in humid environments.

[0104] Compared with the prior art, the embodiments of the present invention provide a temperature sensing cable 100, which has good anti-electromagnetic interference performance and moisture resistance performance. The controller 131 in the temperature sensing control unit 130 can sense the nearby temperature changes through the first temperature acquisition circuit 132 and the second temperature acquisition circuit 133, and output a warning signal to provide a high temperature warning (or fire warning), which is conducive to quickly and accurately locating the high temperature point (or ignition point).

[0105] Figure 4 A flowchart of a fire alarm method 200 according to an embodiment of the present invention is shown. The fire alarm method 200 can be implemented based on the heat-sensing cable 100 as described above, such as... Figure 4 As shown, the fire alarm method 200 includes the following steps, which are described in detail below.

[0106] In step S210: Based on the warning signal, determine multiple relevant temperature sensing control units.

[0107] In a specific implementation, upon receiving an early warning signal, the source of the signal can be traced to identify the temperature-sensing control unit that issued it. For example, the early warning signal typically contains the address information of the temperature-sensing control unit (controller) that issued it. Therefore, the temperature-sensing control unit that issued the signal can be accurately identified using the address information in the early warning signal. After identifying the temperature-sensing control unit that issued the signal, it and other temperature-sensing control units within a certain range around it can be considered as related temperature-sensing control units. Preferably, with the temperature-sensing control unit as the center, other temperature-sensing control units within a certain range upstream and downstream are considered as related temperature-sensing control units. For example, there may be n related temperature-sensing control units, numbered sequentially from upstream to downstream of the temperature-sensing cable as 1, 2, 3, ..., n. It should be noted that the number of related temperature-sensing control units should be determined based on the arrangement of the temperature-sensing cable and the actual application scenario. This invention does not impose a rigid requirement on this number, allowing for adaptation to different application needs and environmental conditions.

[0108] In step S220: Collect temperature field data information for each relevant temperature sensing control unit, wherein the temperature field data information includes a first analog quantity, the rate of change of the first analog quantity, a second analog quantity, and the rate of change of the second analog quantity.

[0109] In a specific implementation, query commands can be sent to multiple relevant temperature sensing control units. Specifically, a specific query command can be sent sequentially and individually to each relevant temperature sensing control unit. This query command is only valid for the corresponding relevant temperature sensing control unit. After receiving the relevant query command, the relevant temperature sensing control unit will feed back the temperature field data it has obtained. Other temperature sensing control units will not respond to this query command. In some embodiments, a single specific query command can also be sent to these relevant temperature sensing control units. This query command is only valid for these relevant temperature sensing control units, and other temperature sensing control units will not respond to this query command.

[0110] After collecting temperature field data from all relevant temperature sensing and control units, vector groups can be established using this temperature field data, as shown in Table 1:

[0111]

[0112]

[0113] In step S230: Based on the temperature field data information from multiple relevant temperature sensing control units, determine whether to activate the fire alarm.

[0114] In a specific implementation, the first element can be determined based on the first analog signal from multiple related temperature sensing control units. Specifically, the first element can be denoted as A. In the formula: n is the number of relevant temperature sensing and control units, M i R1 is the first analog signal of the relevant temperature sensing control unit with serial number i, M i-1 R1 is the first analog signal of the relevant temperature sensing control unit with serial number i-1.

[0115] A second element can be determined based on the rate of change of the first analog quantity of multiple related temperature sensing control units. The second element is the number of related temperature sensing control units whose rate of change of the first analog quantity exceeds a preset threshold, and can be denoted as B. Specifically, M1R1 / T, M2R1 / T, M1R3 / T…M n R1 / T is compared sequentially with a preset threshold, and M1R1 / T, M2R1 / T, M1R3 / T…M are recorded (statistically) n The number of B values ​​in R1 / T that exceed the preset threshold.

[0116] The third element can be determined based on the second analog values ​​from multiple related temperature sensing control units. Specifically, the third element can be denoted as C. Where: M i R a M is the second analog quantity of the relevant temperature sensing control unit with serial number i. i-1 R a M is the second analog quantity of the relevant temperature sensing control unit with serial number i-1. n This serves as an environmental benchmark.

[0117] The fourth element can be determined based on the rate of change of the second analog quantity of multiple related temperature sensing control units. Specifically, the fourth element can be denoted as D. Where: M i R a / T represents the rate of change of the second analog quantity of the relevant temperature sensing control unit with serial number i.

[0118] The first, second, third, and fourth elements can be weighted and merged based on the preset weight coefficients K1, K2, K3, and K4 of the first, second, third, and fourth elements to obtain the fifth element. Specifically, the fifth element is denoted as Q, where Q = K1A + K2B + K3C + K4D.

[0119] The fifth element can be compared with a preset alarm threshold. If the fifth element is greater than the alarm threshold, a fire alarm will be triggered; otherwise, no fire alarm will be triggered.

[0120] Compared with existing technologies, embodiments of the present invention provide a fire alarm method 200 based on a temperature-sensing cable. This method reduces false alarms by comprehensively judging temperature field data from multiple related temperature-sensing control units. Specifically, by comprehensively considering the first analog quantity (A) and the second analog quantity (C) of multiple temperature-sensing control units, it can more accurately capture subtle differences in temperature changes, thereby improving the accuracy of the early warning system. By comprehensively considering the rate of change (B and D) of multiple temperature-sensing control units, it helps to distinguish between slow environmental changes and rapid abnormal changes, such as the rapid temperature rise during a fire. By introducing weighting coefficients (K1, K2, K3, K4) to weight and fuse different elements, the fifth element can adjust the importance of each element according to the needs of the actual application scenario, and at the same time, the fifth element can more comprehensively reflect the fire risk, thereby improving the reliability of fire alarms.

[0121] Figure 5 A schematic diagram of a fire alarm system 300 according to an embodiment of the present invention is shown below. Figure 5 Provide a detailed description.

[0122] like Figure 5 As shown, the fire alarm system 300 includes a temperature-sensing cable 100, a terminal box 320, and a signal processing unit 310. The signal processing unit 310 is connected to the front end of the temperature-sensing cable 100, and the terminal box 320 is connected to the end of the temperature-sensing cable 100. The terminal box 320 ensures the normal operation of the temperature-sensing control unit at the end of the temperature-sensing cable and ensures smooth data link transmission by sending a heartbeat signal. The signal processing unit 310 is configured to determine multiple relevant temperature-sensing control units based on the warning signal, collect temperature field data information from each relevant temperature-sensing control unit, and determine whether to trigger a fire alarm based on the temperature field data information from multiple relevant temperature-sensing control units. The temperature field data information includes a first analog quantity, the rate of change of the first analog quantity, a second analog quantity, and the rate of change of the second analog quantity.

[0123] According to one embodiment of the present invention, such as Figure 5 As shown, the signal processing unit 310 can be configured to determine the temperature sensing control unit that issued the warning signal based on the warning signal; and to designate the temperature sensing control unit that issued the warning signal and a plurality of nearby temperature sensing control units as related temperature sensing control units.

[0124] According to one embodiment of the present invention, such as Figure 5As shown, the signal processing unit 310 is configured to: determine a first element based on the first analog quantity of multiple related temperature sensing control units; determine a second element based on the rate of change of the first analog quantity of multiple related temperature sensing control units; determine a third element based on the second analog quantity of multiple related temperature sensing control units; determine a fourth element based on the rate of change of the second analog quantity of multiple related temperature sensing control units; perform weighted fusion of the first element, second element, third element, and fourth element based on preset weight coefficients for the first element, the second element, the third element, and the fourth element to obtain a fifth element; if the fifth element is greater than the alarm threshold, a fire alarm is triggered; otherwise, no fire alarm is triggered.

[0125] According to one embodiment of the present invention, such as Figure 5 As shown, the signal processing unit 310 is configured to determine the first element A according to the following formula: Where n is the number of relevant temperature sensing control units, M i R1 is the first analog signal of the i-th related temperature sensing control unit among multiple related temperature sensing control units, M i-1 R1 is the first analog signal of the (i-1)th associated temperature sensing control unit among multiple associated temperature sensing control units.

[0126] According to one embodiment of the present invention, such as Figure 5 As shown, the second element is the number of the rate of change of the first analog quantity of the relevant temperature sensing control unit that exceeds the preset threshold.

[0127] According to one embodiment of the present invention, such as Figure 5 As shown, the signal processing unit 310 is configured to determine the third element C according to the following formula: Where n is the number of relevant temperature sensing control units, M i R2 is the second analog signal of the i-th related temperature sensing control unit among multiple related temperature sensing control units, M i-1 R2 is the second analog quantity of the (i-1)th correlated temperature sensing control unit among multiple correlated temperature sensing control units, M n This serves as an environmental benchmark.

[0128] According to one embodiment of the present invention, such as Figure 5 As shown, the signal processing unit 310 is configured to determine the fourth element D according to the following formula: Where n is the number of relevant temperature sensing control units, M i R a / T represents the rate of change of the second analog quantity of the i-th correlated temperature control unit among multiple correlated temperature control units.

[0129] Compared with the prior art, the embodiments of the present invention also provide a fire alarm system 300, which can perform composite judgment on the temperature field data information of multiple related temperature sensing and control units, which is beneficial to reduce false alarms, especially to reduce false alarms caused by factors such as electromagnetic interference, humid environment, construction pressure, and local rapid heating.

[0130] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A temperature-sensing cable, comprising: A plurality of temperature sensing wires are spaced apart along a first direction. Each temperature sensing wire includes a first conductor, a second conductor, and a temperature sensing material. The temperature sensing material is connected between the first conductor and the second conductor. The temperature sensing material is a conductor, and the resistance value of the temperature sensing material changes with temperature. A power signal multiplexing cable extends along the first direction, and the power signal multiplexing cable includes a third conductor and a fourth conductor; and Multiple temperature-sensing control units are provided, each including a controller and a first temperature acquisition circuit. The first temperature acquisition circuit has a thermistor. The multiple temperature-sensing control units are electrically connected between adjacent temperature-sensing wires. Adjacent temperature-sensing control units and the temperature-sensing wires located between them constitute a second temperature acquisition circuit. The controller is coupled to the third wire, the fourth wire, the first temperature acquisition circuit, and the second temperature acquisition circuit, respectively. The controller is configured to receive and / or transmit signals via the power signal multiplexing cable. The controller is configured to output a warning signal based on a first analog quantity from the first temperature acquisition circuit and / or a second analog quantity from the second temperature acquisition circuit, wherein both the first analog quantity and the second analog quantity change with temperature.

2. The temperature-sensing cable according to claim 1, wherein, The controller is configured to: When the first analog quantity reaches the first warning threshold and the second analog quantity is in the first warning interval, a warning signal is output; and / or, When the rate of change of the first analog quantity reaches the second warning threshold and the rate of change of the second analog quantity is in the second warning interval, a warning signal is output. And / or, When the rate of change of the second analog quantity reaches the third warning threshold, a warning signal is output.

3. The temperature-sensing cable according to claim 1, wherein, The first temperature acquisition circuit includes a first resistor and a second resistor connected in series, wherein the first resistor is a thermistor, and an acquisition node is provided between the first resistor and the second resistor; The controller includes a power port and a first acquisition port, wherein the first temperature acquisition circuit is coupled between the power port and ground, the first acquisition port is coupled to the acquisition node, and the controller is configured to acquire a first voltage signal through the first acquisition port and use the first voltage signal as the first analog quantity.

4. The temperature-sensing cable according to claim 3, wherein, The temperature sensing control unit further includes a third resistor, a fourth resistor, a fifth resistor, and a differential circuit. The third resistor is coupled between the upstream end of the first wire and the upstream end of the second wire. The fourth resistor is coupled between the power port and the downstream end of the first wire. The fifth resistor is coupled between the downstream end of the second wire and ground. The differential circuit has two input terminals, one of which is coupled to the downstream end of the first wire and the other input terminal is coupled to the downstream end of the second wire. The controller is configured to receive the output signal of the differential circuit and use it as the second analog quantity.

5. The temperature-sensing cable according to claim 4, wherein, The differential circuit is integrated into the controller.

6. The temperature-sensing cable according to any one of claims 3-5, wherein, The temperature sensing and control unit also includes a voltage regulator capacitor, one electrode of which is grounded and the other electrode is coupled to the power port.

7. The temperature-sensing cable according to claim 1, wherein, The controller includes a power supply port and a data port; The temperature sensing control unit includes a first filtering circuit, which is coupled to the third wire, the power supply port and the data port respectively. The first filtering circuit is configured to work with the power signal multiplexing cable to provide the controller with a stable power supply and a signal that has been limited in amplitude and width.

8. The temperature-sensing cable according to claim 7, wherein, The first filtering circuit includes a sixth resistor, a filter capacitor, and a noise reduction and discharge device. The sixth resistor is connected between the third conductor and the power supply port. One electrode of the filter capacitor is grounded, and the other electrode is coupled between the sixth resistor and the power supply port. The noise reduction and discharge device has a built-in spike discharge circuit and is connected between the third conductor and the data port.

9. The temperature-sensing cable according to claim 7, wherein, The temperature sensing control unit further includes a first diode connected between the third wire and the first filter circuit, and the first diode is configured to allow current to flow from the third wire to the first filter circuit.

10. The temperature-sensing cable according to claim 7, wherein, The controller has a built-in second filtering circuit, which is coupled to the data port and is configured to filter out interference signals.

11. The temperature-sensing cable according to claim 1, wherein, The temperature sensing cable also includes an insulation layer, the power signal multiplexing cable and the temperature sensing wire are embedded in the insulation layer, the insulation layer is provided with a plurality of mounting holes, and the temperature sensing control unit is disposed in the mounting holes; an insulating protective layer is provided outside the insulation layer, and the insulating protective layer is provided along the entire length of the temperature sensing cable.

12. A fire alarm method, based on the heat-sensing cable according to any one of claims 1-11, the fire alarm method comprising: Based on the warning signal, multiple relevant temperature sensing control units are identified; Collect temperature field data information for each of the relevant temperature sensing and control units. The temperature field data information includes a first analog quantity, the rate of change of the first analog quantity, a second analog quantity, and the rate of change of the second analog quantity. Based on the temperature field data information from the multiple related temperature sensing and control units, determine whether to trigger a fire alarm.

13. The fire alarm method according to claim 12, wherein, The step of determining multiple relevant temperature sensing control units based on the warning signal includes: Based on the warning signal, determine the temperature sensing control unit that issued the warning signal; The temperature control unit that issued the warning signal and several nearby temperature control units are designated as relevant temperature control units.

14. The fire alarm method according to claim 12, wherein, The step of determining whether to trigger a fire alarm based on the temperature field data information from the multiple related temperature sensing control units includes: The first element is determined based on the first analog value of the plurality of related temperature sensing control units; The second element is determined based on the rate of change of the first analog quantity of the multiple related temperature sensing control units; The third element is determined based on the second analog value of the plurality of related temperature sensing control units; The fourth element is determined based on the rate of change of the second analog quantity of the multiple related temperature sensing control units; Based on the preset weight coefficients of the first element, the second element, the third element, and the fourth element, the first element, the second element, the third element, and the fourth element are weighted and merged to obtain the fifth element. If the fifth element is greater than the alarm threshold, a fire alarm will be triggered; Otherwise, the fire alarm will not be triggered.

15. The fire alarm method according to claim 14, wherein, The first element A is determined according to the following formula: Where n is the number of relevant temperature sensing control units, M i R1 is the first analog quantity of the i-th related temperature sensing control unit among the plurality of related temperature sensing control units, M i-1 R1 is the first analog quantity of the (i-1)th related temperature sensing control unit among the plurality of related temperature sensing control units.

16. The fire alarm method according to claim 14, wherein, The second element is the number of the rate of change of the first analog quantity of the relevant temperature sensing control unit that exceeds the preset threshold.

17. The fire alarm method according to claim 14, wherein, The third element C is determined according to the following formula: Where n is the number of relevant temperature sensing control units, M i R a M represents the second analog quantity of the i-th related temperature sensing control unit among the plurality of related temperature sensing control units. i-1 R a M is the second analog quantity of the (i-1)th correlated temperature sensing control unit among the plurality of correlated temperature sensing control units. n This serves as an environmental benchmark.

18. The fire alarm method according to claim 14, wherein, The fourth element D is determined according to the following formula: Where n is the number of relevant temperature sensing control units, M i R a / T represents the rate of change of the second analog quantity of the i-th related temperature sensing control unit among the plurality of related temperature sensing control units.

19. A fire alarm system, comprising: The temperature-sensing cable according to any one of claims 1-11; A terminal box is connected to the end of the temperature-sensing cable; A signal processing unit is connected to the front end of the temperature sensing cable, and the signal processing unit is configured to: Based on the warning signal, multiple relevant temperature sensing control units are identified; Collect temperature field data information for each of the relevant temperature sensing and control units. The temperature field data information includes a first analog quantity, the rate of change of the first analog quantity, a second analog quantity, and the rate of change of the second analog quantity. Based on the temperature field data information from the multiple related temperature sensing and control units, determine whether to trigger a fire alarm.

20. The fire alarm system according to claim 19, wherein, The signal processing unit is configured to: Based on the warning signal, determine the temperature sensing control unit that issued the warning signal; The temperature control unit that issued the warning signal and several nearby temperature control units are designated as relevant temperature control units.

21. The fire alarm system according to claim 19, wherein, The signal processing unit is configured to: The first element is determined based on the first analog value of the plurality of related temperature sensing control units; The second element is determined based on the rate of change of the first analog quantity of the multiple related temperature sensing control units; The third element is determined based on the second analog value of the plurality of related temperature sensing control units; The fourth element is determined based on the rate of change of the second analog quantity of the multiple related temperature sensing control units; Based on the preset weight coefficients of the first element, the second element, the third element, and the fourth element, the first element, the second element, the third element, and the fourth element are weighted and merged to obtain the fifth element. If the fifth element is greater than the alarm threshold, a fire alarm will be triggered; Otherwise, the fire alarm will not be triggered.

22. The fire alarm system according to claim 21, wherein, The signal processing unit is configured to determine the first element A according to the following formula: Where n is the number of relevant temperature sensing control units, M i R1 is the first analog quantity of the i-th related temperature sensing control unit among the plurality of related temperature sensing control units, M i-1 R1 is the first analog quantity of the (i-1)th related temperature sensing control unit among the plurality of related temperature sensing control units.

23. The fire alarm system according to claim 21, wherein, The second element is the number of the rate of change of the first analog quantity of the relevant temperature sensing control unit that exceeds the preset threshold.

24. The fire alarm system according to claim 21, wherein, The signal processing unit is configured to determine the third element C according to the following formula: Where n is the number of relevant temperature sensing control units, M i R a M represents the second analog quantity of the i-th related temperature sensing control unit among the plurality of related temperature sensing control units. i-1 R a M is the second analog quantity of the (i-1)th correlated temperature sensing control unit among the plurality of correlated temperature sensing control units. n This serves as an environmental benchmark.

25. The fire alarm system according to claim 21, wherein, The signal processing unit is configured to determine the fourth element D according to the following formula: Where n is the number of relevant temperature sensing control units, M i R a / T represents the rate of change of the second analog quantity of the i-th related temperature sensing control unit among the plurality of related temperature sensing control units.

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