Temperature sensing cable, fire alarm method and fire alarm system

Abstract

According to the temperature sensing cable provided by the invention, a controller in a temperature sensing control unit can sense nearby temperature changes through a first temperature acquisition circuit and a second temperature acquisition circuit, high-temperature early warning (or fire early warning) is carried out in a mode of outputting an early warning signal, and the early warning signal can carry address information of the controller; the high-temperature point (or ignition point) can be accurately positioned by determining the position of the controller sending out the early warning signal. The invention also provides a fire alarm method and a fire alarm system, which are implemented based on the temperature sensing cable, and by performing composite judgment on the temperature field data information of a plurality of related temperature sensing control units, false alarms can be reduced, and the fire alarm efficiency is improved. Especially, false alarms caused by factors such as electromagnetic interference, humid environment, construction extrusion, local rapid temperature rise and the like can be reduced.

Description

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

[0002] The present invention generally 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 Art

[0003] Temperature sensing cable, also known as linear temperature sensing fire detector, is a fire detector that responds to the temperature around a continuous line. Temperature sensing cables are divided into two types: recoverable and irrecoverable. Among them, irrecoverable temperature sensing cable consists of two conductors insulated with heat-sensitive materials. When the ambient temperature rises to the predetermined action temperature, the temperature-sensitive material breaks, causing the two conductors to short-circuit, thereby generating an alarm signal; recoverable temperature sensing cable, also known as analog temperature sensing cable, has a resistance that changes with temperature. When the resistance change reaches the set alarm threshold, the detector sends an alarm signal. Although these temperature sensing cables can be used to monitor the operating temperature of power cables and send out an alarm signal when the temperature at a certain point on the power cable is too high, they cannot be relied on to accurately locate the high-temperature point. In addition, the moisture resistance and electromagnetic interference resistance of these temperature sensing cables are generally poor. When these temperature sensing cables are used to monitor power cables, the temperature sensing cables often cause false alarms due to electromagnetic interference and / or moisture (the layout of power cables usually has high electromagnetic interference and / or humidity).

[0004] The contents of the background technology section are merely the technologies known to the inventors and do not necessarily represent the prior art in the field. Summary of the invention

[0005] In view of one or more defects in the prior art, the present invention provides a temperature sensing cable, comprising:

[0006] Power signal multiplexing cable;

[0007] A plurality of temperature-sensitive wires are arranged at intervals along the length direction of the power signal multiplexing cable, the temperature-sensitive wires include a first wire, a second wire and a temperature-sensitive material, the temperature-sensitive material is connected between the first wire and the second wire, the temperature-sensitive material is a conductor, and the resistance value of the temperature-sensitive material changes with the change of temperature; and

[0008] A plurality of temperature sensing control units, the temperature sensing control units comprising a controller and a first temperature acquisition circuit, the plurality of temperature sensing control units being electrically connected between adjacent temperature sensing lines, respectively, and adjacent temperature sensing control units and the temperature sensing lines therebetween forming a second temperature acquisition circuit, wherein the controller is coupled to the power signal multiplexing cable, the first temperature acquisition circuit and the second temperature acquisition circuit respectively, the controller being configured to receive and / or send signals via the power signal multiplexing cable, the controller being configured to output a warning signal according to a first analog quantity of the first temperature acquisition circuit and / or a second analog quantity of the second temperature acquisition circuit, wherein both the first analog quantity and the second analog quantity change with changes in temperature.

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

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

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

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

[0013] According to one aspect of the present invention, the first temperature acquisition circuit comprises a first resistor and a second resistor connected in series, wherein the first resistor is a thermistor, and a collection 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 port and the downstream end of the first wire, the fifth resistor is coupled between the downstream end of the second wire and the 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 is coupled to the downstream end of the second wire;

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

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

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

[0019] According to one aspect of the present 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 respectively coupled to the third wire, the power supply port and the data port. The first filtering circuit is configured to cooperate with the power signal multiplexing cable to provide the controller with a stable power supply and amplitude and width limiting signals.

[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 discharge device, wherein the sixth resistor is connected between the third wire 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 discharge device has a built-in spike discharge circuit, and the noise reduction and discharge device is connected between the third wire and the data port.

[0023] According to one aspect of the present invention, the temperature sensing control unit further includes a first diode, which is 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.

[0024] According to one aspect of the present invention, the controller has a built-in second filter circuit, the second filter circuit is coupled to the data port, and the second filter circuit is configured to filter out interference signals.

[0025] According to one aspect of the present invention, the temperature sensing cable also includes an insulating layer, the power signal multiplexing cable and the temperature sensing line are embedded in the insulating layer, a plurality of mounting holes are provided on the insulating layer, and the temperature sensing control unit is arranged in the mounting holes; an insulating protective layer is provided on the outer cover of the insulating layer, and the insulating protective layer is arranged 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 as described above, the fire alarm method comprises:

[0027] According to the warning signal, determining a plurality of relevant temperature sensing control units;

[0028] Collecting temperature field data information of each of the related temperature sensing control units, wherein the temperature field data information includes a first analog quantity, a rate of change of the first analog quantity, a second analog quantity, and a rate of change of the second analog quantity;

[0029] Determine whether to issue a fire alarm based on the temperature field data information of the multiple related temperature sensing control units.

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

[0031] According to the warning signal, determining the temperature sensing control unit that issues the warning signal;

[0032] The temperature sensing control unit that issues the warning signal and multiple temperature sensing control units in its vicinity are regarded as relevant temperature sensing 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 comprises:

[0034] Determining a first factor according to first analog quantities of the plurality of related temperature sensing control units;

[0035] Determining a second factor according to a change rate of the first analog quantity of the plurality of related temperature sensing control units;

[0036] determining a third factor according to the second analog quantities of the plurality of related temperature sensing control units;

[0037] determining a fourth factor according to a change rate of the second analog quantity of the plurality of related temperature sensing control units;

[0038] According to a preset weight coefficient of the first element, a preset weight coefficient of the second element, a preset weight coefficient of the third element, and a preset weight coefficient of the fourth element, the first element, the second element, the third element, and the fourth element are weighted and integrated to obtain a fifth element;

[0039] If the fifth factor is greater than the alarm threshold, a fire alarm is issued;

[0040] Otherwise, no fire alarm is given.

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

[0042]

[0043] Where n is the number of related temperature sensing control units, M iR1 is the first analog value of the i-th related temperature sensing control unit among the multiple 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 multiple related temperature sensing control units.

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

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

[0046]

[0047] Where n is the number of related temperature sensing control units, M i R a is the second analog quantity of the i-th related temperature sensing control unit among the multiple related temperature sensing control units, M i-1 R a is the second analog quantity of the i-1th related temperature sensing control unit among the multiple related temperature sensing control units, M n It is the environmental benchmark value.

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

[0049]

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

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

[0052] A temperature sensing cable as described above;

[0053] A terminal box 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 as follows:

[0055] According to the warning signal, determining a plurality of relevant temperature sensing control units;

[0056] Collecting temperature field data information of each of the related temperature sensing control units, wherein the temperature field data information includes a first analog quantity, a rate of change of the first analog quantity, a second analog quantity, and a rate of change of the second analog quantity;

[0057] Determine whether to issue a fire alarm based on the temperature field data information of the multiple related temperature sensing control units.

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

[0059] According to the warning signal, determining the temperature sensing control unit that issues the warning signal;

[0060] The temperature sensing control unit that issues the warning signal and multiple temperature sensing control units in its vicinity are regarded as relevant temperature sensing control units.

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

[0062] Determining a first factor according to first analog quantities of the plurality of related temperature sensing control units;

[0063] Determining a second factor according to a change rate of the first analog quantity of the plurality of related temperature sensing control units;

[0064] determining a third factor according to the second analog quantities of the plurality of related temperature sensing control units;

[0065] determining a fourth factor according to a change rate of the second analog quantity of the plurality of related temperature sensing control units;

[0066] According to a preset weight coefficient of the first element, a preset weight coefficient of the second element, a preset weight coefficient of the third element, and a preset weight coefficient of the fourth element, the first element, the second element, the third element, and the fourth element are weighted and integrated to obtain a fifth element;

[0067] If the fifth factor is greater than the alarm threshold, a fire alarm is issued;

[0068] Otherwise, no fire alarm is given.

[0069] According to one aspect of the present 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 related temperature sensing control units, M i R1 is the first analog value of the i-th related temperature sensing control unit among the multiple 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 multiple related temperature sensing control units.

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

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

[0074]

[0075] Where n is the number of related temperature sensing control units, M i R2 is the second analog value of the i-th related temperature sensing control unit among the multiple related temperature sensing control units, M i-1 R2 is the second analog value of the i-1th related temperature sensing control unit among the multiple related temperature sensing control units, M n It is the environmental benchmark value.

[0076] According to one aspect of the present 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 related temperature sensing control units, M i R a / T is the change rate of the second analog quantity of the i-th related temperature sensing control unit among the multiple related temperature sensing control units.

[0079] Compared with the prior art, an embodiment of the present 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 position of the controller that issues the warning signal, the high temperature point (or fire point) can be accurately located; a first filtering circuit and a power signal multiplexing cable can be used to provide the controller with a stable power supply and amplitude and width limiting signals, and interference signals can be filtered out by building a second filtering circuit into the controller, thereby improving the anti-electromagnetic interference performance of the temperature sensing cable; by embedding the power signal multiplexing cable and the temperature sensing line in the insulating layer, setting the temperature sensing control unit in the mounting hole on the insulating layer and covering the mounting hole with an insulating protective layer, the moisture-proof performance of the temperature sensing cable can be improved.

[0080] An embodiment of the present invention also provides a fire alarm method and a fire alarm system, which are implemented based on the above-mentioned temperature sensing cable and can reduce false alarms by performing composite judgment on the temperature field data information of multiple related temperature sensing control units, especially false alarms caused by electromagnetic interference, humid environment, construction squeezing, local rapid temperature rise and other factors. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying 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 Shows Figure 1 A magnified view of the middle part;

[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 flow chart 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 DESCRIPTION

[0087] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0088] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0089] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0090] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is lower in level than the second feature.

[0091] The disclosure below provides many different embodiments or examples to realize different structures of the present invention. In order to simplify the disclosure of the present invention, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplicity and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0092] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0093] Figure 1 1 shows a schematic diagram of a temperature sensing cable 100 according to an embodiment of the present invention. Figure 2 Shows Figure 1 A magnified view of the middle part. Figure 3 A schematic diagram of a temperature sensing cable 100 according to an embodiment of the present invention is shown below. Figures 1 to 3 Describe in detail.

[0094] like Figures 1 to 3As shown, the temperature sensing cable 100 includes a power signal multiplexing cable 110, a temperature sensing line 120 and a temperature sensing control unit 130, wherein the power signal multiplexing cable 110 extends along a first direction, and can be used to provide power supply and data communication for the temperature sensing control unit 130. There are multiple temperature sensing lines 120 and multiple temperature sensing control units 130, respectively, wherein multiple temperature sensing lines 120 are arranged at intervals along the length direction of the power signal multiplexing cable 110, and multiple temperature sensing control units 130 are respectively electrically connected between adjacent temperature sensing lines 120, that is, the temperature sensing lines 120 and multiple temperature sensing control units 130 are alternately arranged in sequence and connected to each other in the length direction of the power signal multiplexing cable 110. The temperature sensing line 120 includes a first conductor 121, a second conductor 122 and a temperature sensing material Ra, wherein the temperature sensing material Ra is connected between the first conductor 121 and the second conductor 122, and the temperature sensing material Ra is a conductor, and its resistance value changes with the change of temperature (for example, the higher the temperature, the smaller the resistance value of the temperature sensing material Ra). The temperature sensing control unit 130 includes a controller 131 and a first temperature acquisition circuit 132. In addition, adjacent temperature sensing control units 130 and the temperature sensing line 120 located therebetween constitute a second temperature acquisition circuit 133, wherein the first temperature acquisition circuit 132 and the second temperature acquisition circuit 133 can both accurately monitor changes in ambient temperature. Specifically, the controller 131 is coupled to the 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 send signals via the power signal multiplexing cable 110. The controller 131 is also configured to obtain a first analog quantity from the first temperature acquisition circuit 132 and a second analog quantity from the second temperature acquisition circuit 133. The controller 131 is also configured to output an early warning signal according to the first analog quantity and / or the second analog quantity, wherein the first analog quantity and the second analog quantity both change with changes in temperature. Therefore, the early warning signal can accurately reflect temperature anomalies. By tracing the source of the early warning signal, high temperature points or potential ignition points can be accurately found.

[0095] According to one embodiment of the present invention, Figure 1 and Figure 2As shown, the controller 131 can be configured to output a warning signal when the first analog quantity reaches the first warning threshold and the second analog quantity is in the first warning interval. The controller 131 can also be configured to output a warning signal 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; wherein the rate of change of the first analog quantity is: the amount of change of the first analog quantity per unit time, and the rate of change of the second analog quantity is: the amount of change of the second analog quantity per unit time. The controller 131 can also be configured to output a warning signal when the rate of change of the second analog quantity reaches the third warning threshold. The above configuration further enhances the warning capability of the temperature sensing cable 100, so that the temperature sensing cable 100 can not only respond to the current temperature state, but also warn of the trend of temperature changes, thereby playing a key role in fire prevention and early detection.

[0096] According to one embodiment of the present invention, 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, and an acquisition node is provided between the first resistor R1 and the second resistor R2, and the acquisition node is used to connect the controller 131. Among them, the first resistor R1 may be a thermistor, and its resistance value changes according to the change of temperature; preferably, the first resistor R1 is a negative temperature coefficient thermistor, and its resistance value decreases with the increase of temperature. The controller 131 may be a system integrated 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 the ground, and the power port U1 can provide a stable voltage for 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 accordingly, the voltage value at the acquisition node position will also change. The first acquisition port AD1 is coupled to the acquisition node in the first temperature acquisition circuit 132, and 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 the first analog quantity.

[0097] According to one embodiment of the present invention, Figure 1 and Figure 2 As shown, the temperature sensing control unit 130 further includes a third resistor R3, a fourth resistor R4, a fifth resistor R5 and a differential circuit 1331, wherein the third resistor R3, the fourth resistor R4, the fifth resistor R5 and the differential circuit 1331 can cooperate with the temperature sensing line 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 (at Figure 1 and Figure 2, with the left side as the upstream end and the right side as the downstream end) to close the second temperature acquisition circuit 133. The fourth resistor R4 is coupled between the power port U1 and the downstream end of the first wire 121. The fifth resistor R5 is coupled between the downstream end of the second wire 122 and the ground. The differential circuit 1331 has two input terminals, wherein one input terminal X is coupled to the downstream end of the first wire 121 to collect the voltage value of 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 collect the voltage value of the downstream end of the second wire 122; the differential circuit 1331 can process these two voltage values ​​(the voltage value of the downstream end of the first wire 121 and the voltage value of the downstream end of the second wire 122) and output the difference between the two voltage values ​​at the output terminal. The power port U1 of the controller 131 can provide a stable voltage for the second temperature acquisition circuit 133. When the ambient temperature near the second temperature acquisition circuit 133 changes, the resistance value of the temperature-sensitive material Ra changes. Accordingly, 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 (that is, the voltage value at the output end of the differential circuit 1331) and use it as the second analog quantity. Preferably, the differential circuit 1331 can be integrated in the controller 131, and the controller 131 is configured with two acquisition ports as the two input ends X and Y of the differential circuit 1331.

[0098] According to one embodiment of the present invention, Figure 1 and Figure 2 As shown, the temperature sensing control unit 130 may also include a voltage stabilizing capacitor 134, one electrode of the voltage stabilizing capacitor 134 is grounded, and the other electrode is coupled to the power port U1 of the controller 131 (that is, coupled to the input end of the first resistor R1 and the input end of the second resistor R4, respectively). Through the above configuration, the voltage stabilizing capacitor 134 works in conjunction with the power port U1 of the controller 131 to provide a stable voltage supply for the first temperature acquisition circuit 132 and the second temperature acquisition circuit 133. Its advantage is that it can effectively reduce the noise caused by power supply fluctuations, thereby significantly reducing the risk of false warnings generated by the controller 131, helping to improve the electromagnetic compatibility of the temperature sensing cable 100, and further ensuring the operating stability of the temperature sensing cable 100 in an electromagnetic interference environment.

[0099] According to one embodiment of the present invention, Figure 1 and Figure 2As shown, the controller 131 may include a power supply port U2 and a data port I / O, wherein the power supply port U2 may be used to connect an external power source, and the data port I / O may be used to receive an external signal, and may also be used to output a signal to the outside. The power signal multiplexing cable 110 includes a third wire 111 and a fourth wire 112, and the temperature sensing control unit 130 includes a first filter circuit 135, and the first filter circuit 135 is coupled to the third wire 111, the power supply port U2, and the data port I / O, respectively. The first filter circuit 135 is configured to cooperate with the power signal multiplexing cable 110 to provide the controller 131 with a more stable power supply and a limited amplitude and width signal, 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 ensure the clarity and accuracy of the signal.

[0100] According to one embodiment of the present invention, 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 discharge device 137, wherein the sixth resistor R6 is connected between the third wire 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, the high-frequency noise on the power signal multiplexing cable 110 can be effectively filtered out, thereby achieving the purpose of providing a stable power supply for the controller 131; the noise reduction discharge device 137 has a built-in spike discharge circuit, which is connected between the third wire 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, Figure 1 and Figure 2 As shown, the controller 131 has a built-in second filter circuit (not shown in the figure), and 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 anti-electromagnetic interference performance of the controller 131.

[0102] According to one embodiment of the present invention, Figure 1 and Figure 2As shown, the temperature sensing control unit 130 may further include a first diode 138, the first diode 138 is connected between the third wire 111 and the first filter circuit 135, and the first diode 138 is configured to allow current to flow from the third wire 111 to the first filter circuit 135. In addition, the controller 131 also has a power ground interface U3, the power ground interface U3 is grounded, and is connected to the fourth wire 112 through a second diode 139, and the second diode 139 is configured to not allow current to flow from the fourth wire 112 to the power ground interface U3.

[0103] According to one embodiment of the present invention, Figure 3 As shown, the temperature sensing cable 100 also includes an insulating layer 140, the power signal multiplexing cable 110 and the temperature sensing line 120 are embedded in the insulating layer 140, a plurality of mounting holes 150 are arranged at intervals on the insulating layer 140, and the temperature sensing control unit 130 is arranged in the corresponding mounting holes 150. An insulating protective layer 160 is also sleeved outside the insulating layer 140, and the insulating protective layer 160 is arranged along the entire length of the temperature sensing cable 100. The above arrangement can greatly improve the moisture-proof performance of the temperature sensing cable 100 and reduce the possibility of false alarms of the temperature sensing cable 100 in a humid environment.

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

[0105] Figure 4 FIG. 1 is a flow chart showing a fire alarm method 200 according to an embodiment of the present invention. The fire alarm method 200 may be implemented based on the temperature sensing cable 100 as described above. Figure 4 As shown, the fire alarm method 200 includes the following steps, which are described in detail below.

[0106] In step S210: a plurality of relevant temperature sensing control units are determined according to the warning signal.

[0107] In a specific embodiment, when an early warning signal is received, the source of the early warning signal can be traced to determine the temperature sensing control unit that issued the early warning signal. For example, the early warning signal generally contains the address information of the temperature sensing control unit (controller) that issued the early warning signal. Therefore, the temperature sensing control unit that issued the early warning signal can be accurately determined by the address information in the early warning signal. After determining the temperature sensing control unit that issued the early warning signal, the temperature sensing control unit and other temperature sensing control units within a certain range around it can be used as related temperature sensing control units. Preferably, with the temperature sensing control unit as the center, the temperature sensing control unit and other temperature sensing control units within a certain range upstream and downstream are used as related temperature sensing control units. For example, there are n related temperature sensing control units, and the n related temperature sensing control units are arranged in sequence from upstream to downstream of the temperature sensing cable, and the serial numbers are 1, 2, 3, ..., n. It should be noted that the number of related temperature sensing control units should be determined according to the layout of the temperature sensing cable and the actual application scenario. The present invention does not make a rigid provision for the specific setting of this number to adapt to different application requirements and environmental conditions.

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

[0109] In a specific implementation, a query instruction may be sent to multiple related temperature sensing control units. Specifically, a specific query instruction may be sent to each related temperature sensing control unit in sequence and individually. The query instruction is only valid for the corresponding related temperature sensing control unit. After the related temperature sensing control unit receives the query instruction related to it, the related temperature sensing control unit feeds back the temperature field data information it obtains, and other temperature sensing control units do not respond to the query instruction. In some embodiments, a specific query instruction may also be sent to these related temperature sensing control units. The query instruction is only valid for these related temperature sensing control units, and other temperature sensing control units do not respond to the query instruction.

[0110] After collecting the temperature field data information of all relevant temperature sensing control units, a vector group can be established based on the temperature field data information, as shown in Table 1:

[0111]

[0112]

[0113] In step S230: confirm whether to issue a fire alarm based on the temperature field data information of multiple related temperature sensing control units.

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

[0115] The second factor can be determined according to the change rate of the first analog quantity of multiple related temperature sensing control units. The second factor is the number of change rates of the first analog quantity of the related temperature sensing control units that exceeds the preset threshold. The second factor can be recorded as B. Specifically, M1R1 / T, M2R1 / T, M1R3 / T…M n R1 / T is compared with the preset threshold in turn, and records (statistics) M1R1 / T, M2R1 / T, M1R3 / T…M n The number B in R1 / T that exceeds the preset threshold.

[0116] The third factor can be determined according to the second analog quantities of the multiple related temperature sensing control units. Specifically, the third factor can be denoted as C, Where: M i R a is the second analog value of the temperature sensing control unit with serial number i, M i-1 R a is the second analog value of the temperature sensing control unit with serial number i-1, M n It is the environmental benchmark value.

[0117] The fourth factor can be determined according to the change rate of the second analog quantity of multiple related temperature sensing control units. Specifically, the fourth factor can be recorded as D, Where: M i R a / T is the rate of change of the second analog quantity of the relevant temperature sensing control unit with serial number i.

[0118] The first element, the second element, the third element and the fourth element may be weighted and fused according to the preset weight coefficient K1 of the first element, the preset weight coefficient K2 of the second element, the preset weight coefficient K3 of the third element and the preset weight coefficient K4 of the fourth element to obtain the fifth element. Specifically, the fifth element is recorded as Q, Q = K1A + K2B + K3C + K4D.

[0119] The fifth factor may be compared with a preset alarm threshold. If the fifth factor is greater than the alarm threshold, a fire alarm is issued; otherwise, no fire alarm is issued.

[0120] Compared with the prior art, the embodiment of the present invention provides a fire alarm method 200 based on a temperature sensing cable, which can reduce false alarms by performing a composite judgment on the temperature field data information of 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 is possible to more accurately capture the subtle differences in temperature changes, thereby improving the accuracy of the early warning system; by comprehensively considering the change rates (B and D) of multiple temperature sensing control units, it is helpful to distinguish between slow environmental changes and rapid abnormal changes, such as a sharp rise in temperature when a fire occurs; by introducing weight coefficients (K1, K2, K3, K4) to perform weighted fusion of 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 enable the fifth element to more comprehensively reflect the fire risk, thereby improving the reliability of the fire alarm.

[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 Describe in detail.

[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, wherein 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 can ensure the normal operation of the temperature sensing control unit at the end of the temperature sensing cable, and ensure the smoothness of the data link by sending a heartbeat signal. The signal processing unit 310 is configured to determine a plurality of related temperature sensing control units according to the early warning signal, collect the temperature field data information of each related temperature sensing control unit, and confirm whether to issue a fire alarm according to the temperature field data information of the plurality of related temperature sensing control units, wherein the temperature field data information includes a first analog quantity, a change rate of the first analog quantity, a second analog quantity and a change rate of the second analog quantity.

[0123] According to one embodiment of the present invention, Figure 5 As shown, the signal processing unit 310 can be configured to determine the temperature sensing control unit that sends the warning signal according to the warning signal; and use the temperature sensing control unit that sends the warning signal and multiple temperature sensing control units nearby as relevant temperature sensing control units.

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

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

[0126] According to one embodiment of the present invention, Figure 5 As shown, the second factor is the amount 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, Figure 5 As shown, the signal processing unit 310 is configured to determine the third factor C according to the following formula: Where n is the number of related temperature sensing control units, M i R2 is the second analog value of the i-th related temperature sensing control unit among multiple related temperature sensing control units, M i-1 R2 is the second analog value of the i-1th related temperature sensing control unit among the multiple related temperature sensing control units, M n It is the environmental benchmark value.

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

[0129] Compared with the prior art, an embodiment of the present invention further provides a fire alarm system 300, which can perform composite judgment on the temperature field data information of multiple related temperature sensing control units, which is helpful in reducing false alarms, especially false alarms caused by electromagnetic interference, humid environment, construction squeezing, local rapid temperature rise and other factors.

[0130] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A temperature sensing cable, comprising: A plurality of temperature-sensing wires are arranged at intervals along a first direction, the temperature-sensing wires include a first wire, a second wire and a temperature-sensing material, the temperature-sensing material is connected between the first wire and the second wire, the temperature-sensing material is a conductor, and the resistance value of the temperature-sensing material changes with the change of temperature; A power signal multiplexing cable extending along the first direction, wherein the power signal multiplexing cable comprises a third wire and a fourth wire; and A plurality of temperature sensing control units, the temperature sensing control units comprising a controller and a first temperature acquisition circuit, the first temperature acquisition circuit having a thermistor, the plurality of temperature sensing control units being electrically connected between adjacent temperature sensing lines, adjacent temperature sensing control units and the temperature sensing lines therebetween forming a second temperature acquisition circuit, wherein 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 being configured to receive and / or send signals via the power signal multiplexing cable, the controller being configured to output a warning signal according to a first analog quantity of the first temperature acquisition circuit and / or a second analog quantity of the second temperature acquisition circuit, wherein the first analog quantity and the second analog quantity both change with changes in temperature.

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

3. The temperature sensing cable according to claim 1, wherein: The first temperature acquisition circuit comprises a first resistor and a second resistor connected in series, wherein the first resistor is a thermistor, and a collection 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, 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 port and the downstream end of the first wire, the fifth resistor is coupled between the downstream end of the second wire and the 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 is coupled to the downstream end of the second wire; The controller is configured to receive the output signal of the differential circuit as the second analog quantity.

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

6. The temperature sensing cable according to any one of claims 3 to 5, wherein: The temperature sensing control unit further includes a voltage stabilizing capacitor, one electrode of the voltage stabilizing capacitor is grounded, and the other electrode of the voltage stabilizing capacitor 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 respectively coupled to the third wire, the power supply port and the data port. The first filtering circuit is configured to cooperate with the power signal multiplexing cable to provide the controller with a stable power supply and a signal with limited amplitude and width.

8. The temperature sensing cable according to claim 7, wherein: The first filtering circuit includes a sixth resistor, a filtering capacitor and a noise reduction discharge device, wherein the sixth resistor is connected between the third wire 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 discharge device has a built-in spike discharge circuit, and the noise reduction discharge device is connected between the third wire 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 filter circuit, the second filter circuit is coupled to the data port, and the second filter circuit is configured to filter out interference signals.

11. The temperature sensing cable according to claim 1, wherein: The temperature-sensing cable also includes an insulating layer, the power signal multiplexing cable and the temperature-sensing line are embedded in the insulating layer, a plurality of mounting holes are provided on the insulating layer, and the temperature-sensing control unit is arranged in the mounting holes; an insulating protective layer is provided on the outer jacket of the insulating layer, and the insulating protective layer is arranged along the entire length of the temperature-sensing cable.

12. A fire alarm method, based on the temperature sensing cable according to any one of claims 1 to 11, the fire alarm method comprising: According to the warning signal, determining a plurality of relevant temperature sensing control units; Collecting temperature field data information of each of the related temperature sensing control units, wherein the temperature field data information includes a first analog quantity, a rate of change of the first analog quantity, a second analog quantity, and a rate of change of the second analog quantity; Determine whether to issue a fire alarm based on the temperature field data information of the multiple related temperature sensing control units.

13. The fire alarm method according to claim 12, wherein: The step of determining a plurality of relevant temperature sensing control units according to the early warning signal comprises: According to the warning signal, determining the temperature sensing control unit that issues the warning signal; The temperature sensing control unit that issues the warning signal and multiple temperature sensing control units in its vicinity are regarded as relevant temperature sensing control units.

14. The fire alarm method according to claim 12, wherein: The step of confirming whether to issue a fire alarm according to the temperature field data information of the plurality of related temperature sensing control units comprises: Determining a first factor according to first analog quantities of the plurality of related temperature sensing control units; Determining a second factor according to a change rate of the first analog quantity of the plurality of related temperature sensing control units; determining a third factor according to the second analog quantities of the plurality of related temperature sensing control units; determining a fourth factor according to a change rate of the second analog quantity of the plurality of related temperature sensing control units; According to a preset weight coefficient of the first element, a preset weight coefficient of the second element, a preset weight coefficient of the third element, and a preset weight coefficient of the fourth element, the first element, the second element, the third element, and the fourth element are weighted and integrated to obtain a fifth element; If the fifth factor is greater than the alarm threshold, a fire alarm is issued; Otherwise, no fire alarm is given.

15. The fire alarm method according to claim 14, wherein: The first factor A is determined according to the following formula: Where n is the number of related temperature sensing control units, M i R1 is the first analog value of the i-th related temperature sensing control unit among the multiple 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 multiple related temperature sensing control units.

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

17. The fire alarm method according to claim 14, wherein: The third factor C is determined according to the following formula: Where n is the number of related temperature sensing control units, M i R a is the second analog quantity of the i-th related temperature sensing control unit among the multiple related temperature sensing control units, M i-1 R a is the second analog quantity of the i-1th related temperature sensing control unit among the multiple related temperature sensing control units, M n It is the environmental benchmark value.

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

19. A fire alarm system, comprising: The temperature sensing cable according to any one of claims 1 to 11; A terminal box 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 as follows: According to the warning signal, determining a plurality of relevant temperature sensing control units; Collecting temperature field data information of each of the related temperature sensing control units, wherein the temperature field data information includes a first analog quantity, a rate of change of the first analog quantity, a second analog quantity, and a rate of change of the second analog quantity; Determine whether to issue a fire alarm based on the temperature field data information of the multiple related temperature sensing control units.

20. The fire alarm system according to claim 19, wherein: The signal processing unit is configured to: According to the warning signal, determining the temperature sensing control unit that issues the warning signal; The temperature sensing control unit that issues the warning signal and multiple temperature sensing control units in its vicinity are regarded as relevant temperature sensing control units.

21. The fire alarm system according to claim 19, wherein: The signal processing unit is configured to: Determining a first factor according to first analog quantities of the plurality of related temperature sensing control units; Determining a second factor according to a change rate of the first analog quantity of the plurality of related temperature sensing control units; determining a third factor according to the second analog quantities of the plurality of related temperature sensing control units; determining a fourth factor according to a change rate of the second analog quantity of the plurality of related temperature sensing control units; According to a preset weight coefficient of the first element, a preset weight coefficient of the second element, a preset weight coefficient of the third element, and a preset weight coefficient of the fourth element, the first element, the second element, the third element, and the fourth element are weighted and integrated to obtain a fifth element; If the fifth factor is greater than the alarm threshold, a fire alarm is issued; Otherwise, no fire alarm is given.

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

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

24. The fire alarm system according to claim 21, wherein: The signal processing unit is configured to determine the third factor C according to the following formula: Where n is the number of related temperature sensing control units, M i R a is the second analog quantity of the i-th related temperature sensing control unit among the multiple related temperature sensing control units, M i-1 R a is the second analog quantity of the i-1th related temperature sensing control unit among the multiple related temperature sensing control units, M n It is the environmental benchmark value.

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

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