Heat-sensing fire detector and fire monitoring method

Abstract

The present application provides a temperature-sensing fire detector and a fire monitoring method. The temperature-sensing fire detector includes a processing unit and a plurality of detection units. The detection units are used for contact temperature sensing and / or non-contact temperature sensing. The detection units directly connected to the processing unit are direct detection units, and the detection units not directly connected to the processing unit are indirect detection units. The processing unit is connected to a plurality of direct detection units to form a star structure centered on the processing unit, or the direct detection unit and / or the indirect detection unit are connected to a plurality of indirect detection units; each detection unit has an independent number identifiable by the processing unit; the processing unit is used to perform fire monitoring according to the signal transmitted by the detection unit, and locate the location of the fire according to the independent number. In this way, the range of fire monitoring and alarm can be effectively realized under the condition of saving the amount of detection units as much as possible, the cost of engineering equipment can be reduced, and the location of the fire can be located in time.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a temperature-sensitive fire detector and a fire monitoring method. Background Art

[0002] At present, cable-type linear heat-sensing fire detectors are widely used for fire detection at home and abroad. Cable-type linear heat-sensing fire detectors use temperature-sensitive materials to process cables, and then cover the cables with sheaths. The detection principle is generally the impedance change principle (that is, the detector is made of cable materials with special temperature coefficients, and the detection circuit determines whether there is a fire at the scene according to the impedance change of the cable).

[0003] In current engineering applications, the cable-type linear heat-sensing fire detector is restricted by its structure and detection mechanism, and its detection radius is limited, which limits the detection range. If you want to monitor and alarm a fire in a larger space, you usually need to deploy a large number of cable-type linear heat-sensing fire detectors (the monitoring range of cable-type linear heat-sensing fire detectors is near their deployment location), which increases the cost of engineering equipment and reduces the cost-effectiveness of engineering applications. In addition, it is difficult for cable-type linear heat-sensing fire detectors to effectively locate the location of the fire, which is not conducive to timely fire rescue. Summary of the invention

[0004] The purpose of the embodiments of the present application is to provide a temperature-sensitive fire detector and a fire monitoring method, so as to perform fire monitoring and alarm in a larger space as possible and locate the fire location in time.

[0005] In order to achieve the above purpose, the embodiments of the present application are implemented in the following manner:

[0006] In the first aspect, an embodiment of the present application provides a temperature-sensing fire detector, which includes a processing unit and multiple detection units, the detection units are used for contact temperature sensing and / or non-contact temperature sensing, the detection units directly connected to the processing unit are direct detection units, and the detection units not directly connected to the processing unit are indirect detection units, the processing unit is connected to multiple direct detection units to form a star structure with the processing unit as the center, or the direct detection unit and / or the indirect detection unit are connected to multiple indirect detection units; each of the detection units has an independent number identifiable by the processing unit; the processing unit is used to monitor fire according to the signal transmitted by the detection unit, and to locate the fire location according to the independent number of the detection unit.

[0007] Multiple detection units of the temperature-sensitive fire detector can be connected to the processing unit, wherein the detection unit directly connected to the processing unit is a direct detection unit, and the detection unit not directly connected to the processing unit is an indirect detection unit. According to actual needs, multiple detection units can be connected to the processing unit to form a star structure, a tree structure, etc. Compared with the fire monitoring of the same size range by the cable-type linear temperature-sensitive fire detector (the cable-type linear temperature-sensitive fire detector cannot be set up with a branch structure. In actual application, each set of cable-type linear detectors will pass through the trunk part when laid, causing waste), it can effectively realize range-wide fire monitoring and alarm under the condition of saving the number of detection units as much as possible, reduce the cost of engineering equipment, and improve the engineering application cost performance of temperature-sensitive fire detectors. In addition, since each detection unit has an independent number that can be recognized by the processing unit, the processing unit can determine the location of the alarm detection unit through the independent number, which is conducive to timely locating the location of the fire.

[0008] In combination with the first aspect, in a first possible implementation of the first aspect, the detection unit includes a temperature sensing cable and a temperature sensing element, the temperature sensing element has the independent number and is used for contact temperature sensing and non-contact temperature sensing, and the temperature sensing cable is used for contact temperature sensing; one end of the temperature sensing cable is connected to the temperature sensing element; the other end of the temperature sensing cable is used to connect to the processing unit, or to connect to the temperature sensing element of another detection unit.

[0009] The detection unit includes a temperature sensing cable and a temperature sensing element. The temperature sensing element can be used for contact temperature sensing and non-contact temperature sensing. The temperature sensing cable can be used to connect with the temperature sensing element of the processing unit or another detection unit, thereby realizing the expansion of the temperature sensing fire detector. The distribution range of the temperature sensing fire detector can be changed according to actual needs, so that the temperature sensing fire detector can adapt to a variety of environments. In addition, the temperature sensing cable is used for contact temperature sensing, while the temperature sensing element is used for contact temperature sensing and non-contact temperature sensing. The advantages of both can be combined, so that the detection result of the detection unit is closer to the temperature condition in the actual environment, and the influence caused by the structure and setting method of the cable-type linear temperature sensing fire detector itself can be avoided as much as possible (the cable-type linear temperature sensing fire detector is susceptible to electromagnetic interference).

[0010] In combination with the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the temperature sensing cable is cabled in a multi-core twisted manner.

[0011] The temperature sensing cable is made of multi-core twisted cables, and the multi-core twisted structure can effectively suppress common mode interference, so it has strong anti-interference ability, thereby minimizing the impact of electromagnetic interference on the detection results of the temperature sensing cable.

[0012] In combination with the first possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect, the temperature sensing cable and the temperature sensing element are connected by ultrasonic welding, infrared welding or laser welding.

[0013] By connecting the temperature sensing cable and the temperature sensing element by ultrasonic welding, infrared welding or laser welding, a waterproof and dustproof effect can be achieved, and the detection accuracy of the detection unit can be guaranteed as much as possible.

[0014] In combination with the first possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, a relay module is further connected between the temperature sensing cable and the temperature sensing element of the detection unit, and the relay module is used to amplify the received signal and output it.

[0015] A relay module is connected between the temperature sensing cable and the temperature sensing element of the detection unit to amplify the received signal, which is beneficial to ensure the accuracy of the detection results of the detection unit far away from the processing unit, thereby providing a basis for accurate monitoring of large-scale fire monitoring by temperature-sensitive fire detectors.

[0016] In combination with the fourth possible implementation of the first aspect, in a fifth possible implementation of the first aspect, the relay module includes a temperature-sensing cable amplifying circuit and a temperature-sensing element amplifying circuit, the temperature-sensing cable amplifying circuit being used to amplify the signal of the temperature-sensing cable; the temperature-sensing element amplifying circuit being used to amplify the signal of the temperature-sensing element.

[0017] By arranging a temperature sensing cable amplifying circuit and a temperature sensing element amplifying circuit in the relay module, the signal of the temperature sensing cable and the signal of the temperature sensing element are amplified respectively, which is beneficial to ensure the accuracy of the detection result of the detection unit.

[0018] In a second aspect, an embodiment of the present application provides a fire monitoring method, which is applied to a processing unit in a temperature-sensitive fire detector described in the first aspect or any possible implementation of the first aspect, and the method includes: obtaining real-time temperature data transmitted back by the detection unit, and obtaining an independent number of the detection unit; determining the difference between the real-time temperature data and the historical temperature data of the detection unit; when the difference is greater than a first preset value, determining the fire location according to the independent number and issuing a fire alarm.

[0019] By determining the difference between the instantaneous temperature data and the historical temperature data and comparing it with the first preset value, when the difference is greater than the first preset value, the fire location is determined according to the independent number and a fire alarm is issued. In this way, when the temperature data change value detected by the detection unit exceeds the first preset value, it can be determined that a fire has occurred there, thereby accurately monitoring the fire and timely locating the location of the fire, which is conducive to timely fire rescue.

[0020] In combination with the second aspect, in a first possible implementation method of the second aspect, when the difference is not greater than the first preset value, the method also includes: determining whether the difference is greater than a second preset value, wherein the second preset value is less than the first preset value; if so, recording the detection unit corresponding to the independent number and issuing an early warning; if not, updating the historical temperature data according to the real-time temperature data.

[0021] When the difference is between the first preset value and the second preset value, it is determined that a fire may have occurred at the location monitored by the detection unit, and the detection unit is recorded and an early warning is issued. This can avoid as much as possible the situation where the fire is not detected because the difference between the instant temperature data detected by the detection unit and the historical temperature data in the early stage of the fire does not reach the first preset value. It can also avoid as much as possible the situation where the fire is detected only after it has spread, which is conducive to timely fire rescue.

[0022] In combination with the first possible implementation method of the second aspect, in a second possible implementation method of the second aspect, when the difference is greater than a second preset value and not greater than the first preset value, after recording the detection unit corresponding to the independent number and issuing an early warning, the method further includes: determining the number of detection units that issue an early warning in the same time period; when the number is less than a preset number, determining the fire location according to the independent number and issuing a fire alarm; when the number is not less than a preset number, determining the installation position of each of the early warning detection units, and updating the first preset value according to the installation position of each of the early warning detection units.

[0023] When the difference is between the first preset value and the second preset value, the number of detection units that are warned in the same period is determined. If the number is less than the preset number, it means that the temperature rise is likely caused by a local fire rather than a rise in ambient temperature, so it can effectively and timely warn of the occurrence of a fire. When the number of detection units that are warned is not less than the preset number, it means that the temperature data rise detected by these detection units is likely caused by a rise in ambient temperature, and false alarms can be avoided as much as possible.

[0024] In a third aspect, an embodiment of the present application provides a fire monitoring method, which is applied to a processing unit in a temperature-sensitive fire detector described in the first aspect or any possible implementation of the first aspect, and the method includes: obtaining real-time temperature data transmitted back by the detection unit, and obtaining an independent number of the detection unit; comparing the real-time temperature value in the real-time temperature data with the alarm temperature value; when the real-time temperature value is greater than the alarm temperature value, determining the fire location according to the independent number and issuing a fire alarm.

[0025] By comparing the instant temperature value in the instant temperature data with the alarm temperature value, when the instant temperature value is greater than the alarm temperature value, the fire location is determined according to the independent number and a fire alarm is issued. In this way, when the temperature value detected by the detection unit exceeds the alarm temperature value, it can be determined that a fire has occurred there, thereby accurately monitoring the fire and timely locating the location of the fire, which is conducive to timely fire rescue.

[0026] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of a temperature-sensitive fire detector provided in an embodiment of the present application.

[0029] Figure 2 A schematic diagram of the structure of another temperature-sensitive fire detector provided in an embodiment of the present application.

[0030] Figure 3 A schematic diagram of the structure of a detection unit provided in an embodiment of the present application.

[0031] Figure 4 A schematic diagram of the structure of another detection unit provided in an embodiment of the present application.

[0032] Figure 5 A schematic diagram of the structure of a temperature sensing cable provided in an embodiment of the present application.

[0033] Figure 6 This is a circuit diagram of the first part of a temperature sensing element amplifier circuit provided in an embodiment of the present application.

[0034] Figure 7 This is a circuit diagram of the second part of a temperature sensing element amplifier circuit provided in an embodiment of the present application.

[0035] Figure 8 A circuit diagram of a temperature sensing cable amplifier circuit provided in an embodiment of the present application.

[0036] Fig. 9 A flow chart of a fire monitoring method provided in an embodiment of the present application.

[0037] Fig.10 A flowchart of another fire monitoring method provided in an embodiment of the present application.

[0038] Icon: 10-temperature-sensitive fire detector; 11-processing unit; 12-detection unit; 121-temperature-sensitive element; 1211-temperature-sensitive window; 122-temperature-sensitive cable; 1221-temperature-sensitive wire core; 1222-sheath; 12A-direct detection unit; 12B-indirect detection unit. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0040] See also Figure 1 , Figure 1 A schematic structural diagram of a temperature-sensitive fire detector 10 provided in an embodiment of the present application.

[0041] In this embodiment, the temperature-sensing fire detector 10 may include a processing unit 11 and a detection unit 12 .

[0042] The processing unit 11 may be connected to a plurality of detection units 12 to receive temperature data detected by the detection units 12 and process the temperature data.

[0043] Due to the complexity and changeability of the actual environment, in order to achieve fire monitoring over a larger area with as few temperature-sensitive fire detectors 10 as possible, illustratively, the connection method between the processing unit 11 and multiple detection units 12 can be: multiple detection units 12 are connected with the processing unit 11 as the center, forming a star structure with the processing unit 11 as the center.

[0044] In this embodiment, for the convenience of description, the detection unit 12 is distinguished here: the detection unit 12 directly connected to the processing unit 11 is regarded as the direct detection unit 12A, and the detection unit 12 not directly connected to the processing unit 11 is regarded as the indirect detection unit 12B. It should be noted that the individual structures of the direct detection unit 12A and the indirect detection unit 12B are the same, and they are different in the connection position, and they are not two completely different detection units 12.

[0045] Therefore, the processing unit 11 is connected to the plurality of detection units 12 in a star structure, that is, the processing unit 11 is connected to the plurality of direct detection units 12A. The star-structured heat-sensing fire detector 10 can monitor fires in a wider range of environments than the cable-type linear heat-sensing fire detector 10, rather than limiting the monitoring range to the vicinity of the installation path of the cable-type linear heat-sensing fire detector 10 (e.g., a 2-meter range around the cable-type linear heat-sensing fire detector 10).

[0046] Of course, the connection method between the processing unit 11 and the plurality of detection units 12 in the temperature-sensitive fire detector 10 is not limited to the above-mentioned star structure.

[0047] See also Figure 2 , Figure 2 A schematic structural diagram of another temperature-sensitive fire detector 10 provided in an embodiment of the present application is shown.

[0048] In order to more accurately monitor the fire in the environment within the range, a tree-structured connection method can be used to connect the processing unit 11 and the multiple detection units 12. Exemplarily, a plurality of indirect detection units 12B can be connected to the direct detection unit 12A, so that multiple indirect detection units 12B are arranged within the range monitored by the direct detection unit 12A and the indirect detection unit 12B, so that more accurate fire monitoring can be performed on the environment in the range.

[0049] Of course, multiple non-direct detection units 12B can also be connected to the non-direct detection unit 12B, so that more non-direct detection units 12B can be deployed within the range monitored by the non-direct detection unit 12B and the multiple connected non-direct detection units 12B, so as to perform more accurate fire monitoring of the environment in the range. Therefore, in practical applications, the deployment can be carried out after comprehensive consideration of factors such as actual needs and deployment costs, and this should not be regarded as a limitation of the present application.

[0050] In addition, it should be noted that the situation in which only one direct detection unit 12A is connected to the processing unit 11, and multiple indirect detection units 12B are connected to the direct detection unit 12A, or multiple indirect detection units 12B are connected to a certain indirect detection unit 12B of the temperature-sensitive fire detector 10, also falls within the scope of protection claimed by this application.

[0051] The heat-sensing fire detector 10 adopts such a structure. Compared with the fire monitoring of the same size range by the cable-type linear heat-sensing fire detector (the cable-type linear heat-sensing fire detector needs to set up a multi-layer ring structure, referring to multiple concentric circles, to achieve effective fire monitoring of the range area), it can effectively achieve range fire monitoring while saving the amount of detection units 12 as much as possible, which can reduce the cost of engineering equipment and improve the engineering application cost performance of the heat-sensing fire detector 10. In addition, the structure can be adjusted according to actual needs, and the detection units 12 can be arranged within the range to improve the fire monitoring of the environment within the range with higher accuracy.

[0052] In this embodiment, in order to locate the location of the fire, illustratively, each detection unit 12 in the temperature-sensitive fire detector 10 has an independent number that can be identified by the processing unit 11. The installation position of each detection unit 12 can be associated with the independent number of the corresponding detection unit 12, and the installation position of the detection unit 12 can be located by identifying the independent number of the detection unit 12 (that is, the location of the fire can be located). In this way, the location of the fire can be quickly and accurately located, which is conducive to timely rescue of the fire.

[0053] See also Figure 3 , Figure 3 The schematic diagram of the structure of a detection unit 12 provided in an embodiment of the present application is shown. In this embodiment, the detection unit 12 may include a temperature sensing element 121 and a temperature sensing cable 122 .

[0054] The temperature sensing element 121 may have an independent number (i.e., an independent number in the detection unit 12 that can be identified by the processing unit 11), so that the location of the fire can be located by locating the installation position of the temperature sensing element 121. In this embodiment, the temperature sensing element 121 can be used for contact temperature sensing and non-contact temperature sensing, wherein non-contact temperature sensing can use image temperature sensing (such as infrared image temperature sensing). Since the temperature sensing element 121 itself also has the function of contact temperature sensing, the contact temperature sensing can contact the surface of the object to detect the temperature. The temperature sensing cable 122 has the function of contact temperature sensing, thereby ensuring the consistency of the detection unit 12 when detecting the temperature. Therefore, the temperature sensing element 121 can also realize the temperature sensing function that is no different from that of the temperature sensing cable 122. That is, the temperature sensing cable 122 can realize contact temperature sensing (contact temperature sensing that both have) together with the temperature sensing element 121, and the temperature sensing cable 122 can rely on the non-contact temperature sensing function of the temperature sensing element 121 to realize non-contact temperature sensing together. A temperature sensing window 1211 may be provided on the temperature sensing element 121 to facilitate non-contact temperature sensing of the temperature sensing element 121 .

[0055] See also Figure 4 , Figure 4 FIG. 1 shows a schematic diagram of connecting a circular temperature sensing cable 122 to a temperature sensing element 121. Figure 3 The illustrated embodiment shows a flat temperature sensing cable 122. The shape and selected type of the temperature sensing cable 122 herein should not be considered as limiting the present application.

[0056] See also Figure 5 In this embodiment, the temperature sensing cable 122 may include a temperature sensing core 1221 and a sheath 1222. The sheath 1222 may be coated on the surface of the temperature sensing core 1221 to protect the temperature sensing core 1221. In order to reduce the electromagnetic interference to the temperature sensing cable 122 as much as possible, the temperature sensing cable 122 may be cabled in a multi-core twisted manner, for example. Figure 5 The two cores are twisted together as shown in A, or Figure 5 The four-core twisted cable shown in B is used for cable formation. The multi-core twisted cable is used for cable formation, and the multi-core twisted structure can effectively suppress common mode interference, so it has strong anti-interference ability, thereby minimizing the impact of electromagnetic interference on the detection results of the temperature sensing cable 122. Of course, the two listed multi-core twisted cable formation methods should not be regarded as limitations on the present application.

[0057] One end of the temperature sensing cable 122 may be connected to the temperature sensing element 121 , and the other end of the temperature sensing cable 122 may be connected to the processing unit 11 , or may be connected to the temperature sensing element 121 of another detection unit 12 .

[0058] Exemplarily, in the direct detection unit 12A, one end of the temperature sensing cable 122 is connected to the temperature sensing element 121 (forming the detection unit 12), and the other end of the temperature sensing cable 122 can be connected to the processing unit 11. In the indirect detection unit 12B, one end of the temperature sensing cable 122 is connected to the temperature sensing element 121 (forming the detection unit 12), and the other end is connected to the temperature sensing element 121 of another detection unit 12.

[0059] In this way, the connection between the detection unit 12 and the processing unit 11 in the temperature-sensitive fire detector 10, as well as the connection between the detection units 12 and the detection units 12 can be realized, so that the structure of the temperature-sensitive fire detector 10 can be adjusted according to actual needs to adapt to the actual environment, thereby making the temperature-sensitive fire detector 10 more flexible and applicable.

[0060] In this embodiment, in order to ensure the detection accuracy of the detection unit 12, the temperature sensing cable 122 and the temperature sensing element 121 can be connected by ultrasonic welding, infrared welding or laser welding. By adopting ultrasonic welding, infrared welding or laser welding, the welding part of the temperature sensing cable 122 and the temperature sensing element 121 can achieve a waterproof and dustproof effect, thereby ensuring the accuracy of the detection unit 12. Of course, the connection between the temperature sensing cable 122 and the temperature sensing element 121 in the temperature sensing fire detector 10 provided in the embodiment of the present application, and the connection between the temperature sensing cable 122 and the processing unit 11 can adopt such a welding method, which is not limited here.

[0061] In addition, it should be noted that since the temperature sensing cable 122 is a conductor and under the conditions of small current / small voltage (0.5A and below / 36V and below), the impact on the temperature sensing cable 122 and the temperature sensing element 121 is extremely small, therefore, the temperature sensing cable 122 can also be used as a communication and power supply multiplexing line, so there is no need for additional lines to power the temperature sensing cable 122 and the temperature sensing element 121, which can save costs and make the structure of the detection unit 12 and the temperature sensing fire detector 10 more concise.

[0062] When the detection unit 12 connected to a processing unit 11 is far away from the processing unit 11 (for example, 10 kilometers or more), the detection signal of the detection unit 12 may be weak when it is transmitted to the processing unit 11, which is not conducive to the accurate fire monitoring of the environment by the temperature-sensitive fire detector 10. Therefore, in order to ensure the monitoring accuracy of the temperature-sensitive fire detector 10, a relay module can be connected between the temperature-sensitive cable 122 and the temperature-sensitive element 121 to amplify the received signal and output it to ensure the signal strength. Exemplarily, the relay module can be set between the temperature-sensitive cable 122 of one detection unit 12 and the temperature-sensitive element 121 of another detection unit 12, taking the detection unit 12 as a unit, so that the signal of the detection unit 12 can be amplified and transmitted to another detection unit 12, and finally transmitted to the processing unit 11.

[0063] In this embodiment, the relay module may include an amplifying circuit for the temperature sensing cable 122 and an amplifying circuit for the temperature sensing element 121. The amplifying circuit for the temperature sensing cable 122 may be used to amplify the signal of the temperature sensing cable 122, while the amplifying circuit for the temperature sensing element 121 may be used to amplify the signal of the temperature sensing element 121. Thus, the strength of the signal transmitted from the detection unit 12 to the processing unit 11 can be ensured.

[0064] For example, see Figure 6 and Figure 7 , Figure 6 and Figure 7The first and second circuit diagrams of the temperature sensing element 121 amplifier circuit are shown respectively (because the drawings are too large to be viewed, they are shown in two parts, where: Figure 6 The M and N in the part are respectively Figure 7 M and N in the figure are connected correspondingly, thus forming an amplifying circuit of the temperature sensing element 121).

[0065] The temperature sensing element 121 amplifier circuit provided in the embodiment of the present application can be found in the specific circuit connection method. Figure 6 and Figure 7 The circuit connection shown in the figure is not described in detail here. Among them, thermopile represents a thermopile, 2.5V, 4.5V, 5V, etc. represent voltage sources of 2.5 volts, 4.5 volts, and 5 volts respectively, NTC OUT represents the output of the thermistor (i.e., the output of ambient temperature sensing), IR OUT represents the infrared output (i.e., the output of non-contact temperature sensing), R1 to R14 represent resistors, and C2, C3, C4, C6, C7, C8, C9, C11, C13, and C14 represent capacitors.

[0066] For example, see Figure 8 , Figure 8 The circuit diagram of the temperature sensing cable 122 amplifier circuit is shown. The temperature sensing cable 122 amplifier circuit provided in the embodiment of the present application can be found in the specific circuit connection method. Figure 8 The circuit connection shown in the figure is not described in detail here. Among them, OPA4317ID is an operational amplifier, VCC represents a voltage source, the letter R and a number represent a resistor, the letter C and a number represent a capacitor, FB1 and FB2 represent inductors, and CT3 represents a chip capacitor.

[0067] It should be noted that there are various designs and connection methods for implementing signal amplification circuits, and the specific connection method of the temperature sensing element 121 amplification circuit provided in the embodiment of the present application, as well as the specific connection method of the temperature sensing cable 122 amplification circuit, are only one of the multiple methods and should not be regarded as a limitation on the present application.

[0068] Based on the same concept, the embodiment of the present application also provides a fire monitoring method, which is applied to the processing unit of the temperature-sensitive fire detector provided in the embodiment of the present application. Fig. 9 , Fig. 9 A flow chart of a fire monitoring method provided in an embodiment of the present application is shown. In this embodiment, the fire monitoring method may include: step S10, step S20 and step S30.

[0069] In this embodiment, the processing unit may execute step S10.

[0070] Step S10: Acquire the real-time temperature data returned by the detection unit, and acquire the independent serial number of the detection unit.

[0071] In this embodiment, the processing unit can obtain the instantaneous temperature data returned by the detection unit (i.e., the real-time temperature data detected by the detection unit), and on the other hand, the processing unit can obtain the independent number of the detection unit. It should be noted that the order of obtaining the instantaneous temperature data and the independent number is not limited.

[0072] After acquiring the real-time temperature data sent back by the detection unit, the processing unit may execute step S20.

[0073] Step S20: Determine the difference between the instantaneous temperature data and the historical temperature data of the detection unit.

[0074] In this embodiment, the historical temperature data of the detection unit can be determined. For example, the historical temperature data sent back by the detection unit can be determined by the independent number of the detection unit. In order to determine the temperature change of the environment within the range detected by the detection unit, the difference between the instantaneous temperature data and the historical temperature data can be determined (difference = instantaneous temperature data - historical temperature data).

[0075] After determining the difference value, the processing unit may execute step S30.

[0076] Step S30: When the difference is greater than a first preset value, the fire location is determined according to the independent number and a fire alarm is issued.

[0077] In this embodiment, the processing unit can compare the difference with the first preset value. When the difference is greater than the first preset value, it means that the temperature change is large, and it is very likely that a fire has occurred here. Therefore, the processing unit can determine the location where the fire may occur based on the installation location of the detection unit, so that the location of the fire can be located when a fire occurs, which is conducive to timely alarm and emergency rescue of the fire.

[0078] When the difference is not greater than the first preset value, in order to further eliminate the possibility of a fire (and, as far as possible, to alarm the fire before the fire becomes intense), the processing unit may determine whether the difference is greater than a second preset value, wherein the second preset value is less than the first preset value.

[0079] If (i.e. the difference is between the first preset value and the second preset value), the processing unit can record the detection unit corresponding to the independent number and issue an early warning. In this way, the environment of the range detected by these detection units can be regarded as a suspicious object for further investigation.

[0080] When the difference is between the first preset value and the second preset value, it is determined that a fire may have occurred at the location monitored by the detection unit, and the detection unit is recorded and an early warning is issued. This can avoid as much as possible the situation where the fire is not detected in time because the difference between the instant temperature data detected by the detection unit and the historical temperature data before the fire occurs does not reach the first preset value. It can also avoid as much as possible the situation where the fire is detected only after it has spread, which is conducive to timely fire rescue.

[0081] In this embodiment, the processing unit can also determine the number of detection units that have been warned in the same period. Exemplarily, the processing unit can determine the number of detection units (i.e., the independent numbers of the recorded detection units) that have been warned in the current period (i.e., in the same period) after processing the real-time temperature data returned by all detection units. When the number is less than the preset number, the fire location is determined according to the independent number and a fire alarm is issued.

[0082] In this embodiment, when the number of warning detection units is not less than a preset number, the processing unit can also determine the installation position of each warning detection unit, analyze these positions to determine the amount that should be adjusted to update the first preset value.

[0083] For example, if the installation locations of these detection units are relatively scattered, the temperature difference of all detection units (the difference between the instantaneous temperature data and the historical temperature data of the detection units in the same period) can be obtained, and after the average value is calculated, the first preset value is adjusted according to a certain proportion of the average value (for example, the proportion can be 0.7, 0.6, 0.75, etc., not limited here). If the installation locations of these detection units are relatively concentrated, it means that this situation belongs to the temperature change of the local area, so when adjusting the first preset value, the first preset value can be adjusted according to a lower proportion (for example, the proportion can be 0.3, 0.2, 0.1, etc., not limited here).

[0084] When the number of warning detection units is not less than a preset number, it indicates that the rise in temperature data detected by these detection units is likely to be caused by a rise in ambient temperature, and false alarms can be avoided as much as possible.

[0085] It should be noted that, within the deployment range of the temperature-sensitive fire detector, the overall ambient temperature change usually causes the instantaneous temperature data of most detection units to change. If the number of detection units that are warned is less than the preset number, it means that the temperature change is a temperature change within a small range, which is likely to be caused by a fire in a local area, rather than a change in ambient temperature. Therefore, monitoring the environment within the range in this way can effectively monitor and alarm the occurrence of fire accurately and timely.

[0086] If the difference is less than the second preset value, it means that no fire has occurred within the range detected by the detection unit. The historical temperature data of the detection unit may also be updated based on the real-time temperature data of the detection unit.

[0087] It should be noted that in the case of an alarm, the historical temperature data of the detection unit may not be updated. For the case of an early warning but no alarm, the historical temperature data may be updated. Updating the historical temperature data is helpful to prevent false alarms. The time interval for the processing unit to obtain the returned data may be once every 5 minutes, once every 3 minutes, etc., which is not limited here.

[0088] In addition, this embodiment uses the difference between the instantaneous temperature data and the historical temperature data as the judgment standard, but this should not be regarded as a limitation of the present application. In some other optional implementations, the judgment can also be made based on the temperature value in the instantaneous temperature data sent back by the detection unit, or it can be made by combining the temperature value and the difference. These methods should all fall within the protection scope of the fire monitoring method provided in the embodiments of the present application.

[0089] See also Fig.10 , Fig.10 FIG. 2 is a flow chart of another fire monitoring method provided by an embodiment of the present application. In this embodiment, the fire monitoring method may include: step S100, step S200 and step S300.

[0090] In this embodiment, the processing unit may execute step S100.

[0091] Step S100: Acquire the real-time temperature data returned by the detection unit, and acquire the independent serial number of the detection unit.

[0092] In this embodiment, the processing unit can obtain the instantaneous temperature data returned by the detection unit (i.e., the real-time temperature data detected by the detection unit), and on the other hand, the processing unit can obtain the independent number of the detection unit. It should be noted that the order of obtaining the instantaneous temperature data and the independent number is not limited.

[0093] After acquiring the real-time temperature data returned by the detection unit, the processing unit may execute step S200.

[0094] Step S200: Compare the instant temperature value in the instant temperature data with the alarm temperature value.

[0095] In this embodiment, the processing unit may compare the instant temperature value in the instant temperature data with the alarm temperature value.

[0096] Then, the processing unit may execute step S300.

[0097] Step S300: When the instantaneous temperature value is greater than the alarm temperature value, the fire location is determined according to the independent number and a fire alarm is issued.

[0098] In this embodiment, when the processing unit determines that the instantaneous temperature value is greater than the alarm temperature value, the fire location can be determined according to the independent number and a fire alarm can be issued. The specific fire location method can refer to the above method, and the alarm can be issued based on the determined fire location, which will not be repeated here.

[0099] By comparing the instant temperature value in the instant temperature data with the alarm temperature value, when the instant temperature value is greater than the alarm temperature value, the fire location is determined according to the independent number and a fire alarm is issued. In this way, when the temperature value detected by the detection unit exceeds the alarm temperature value, it can be determined that a fire has occurred there, thereby accurately monitoring the fire and timely locating the location of the fire, which is conducive to timely fire rescue.

[0100] It should be noted that the above two fire monitoring methods can be operated independently of each other without affecting each other, or can be operated in combination, which is not limited here.

[0101] In summary, the embodiments of the present application provide a temperature-sensitive fire detector and a fire monitoring method, wherein multiple detection units of the temperature-sensitive fire detector can be connected to a processing unit, wherein the detection unit directly connected to the processing unit is a direct detection unit, and the detection unit not directly connected to the processing unit is an indirect detection unit. According to actual needs, multiple detection units can be connected to the processing unit to form a star structure, a tree structure, etc., so that range-based fire monitoring and alarm can be effectively achieved while saving the number of detection units as much as possible, which can reduce the cost of engineering equipment and improve the engineering application cost-effectiveness of temperature-sensitive fire detectors. In addition, since each detection unit has an independent number that can be recognized by the processing unit, the processing unit can determine the position of the alarming detection unit through the independent number, which is conducive to timely locating the location of the fire.

[0102] In the embodiments provided in this application, it should be understood that the disclosed method can be implemented in other ways. The device embodiments described above are merely illustrative.

[0103] In this document, relational terms such as first and second, etc. are used merely to distinguish one entity or operation from another entity or operation, but do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0104] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A heat-sensing fire detector, characterized in that: The temperature-sensing fire detector comprises a processing unit and a plurality of detection units, wherein the detection units are used for contact temperature sensing and / or non-contact temperature sensing, the detection units directly connected to the processing unit are direct detection units, and the detection units not directly connected to the processing unit are indirect detection units. The processing unit is connected to the multiple direct detection units in a star structure with the processing unit as the center, or the processing unit is connected to the multiple direct detection units in a tree structure, and the direct detection unit and / or the indirect detection unit are connected to multiple indirect detection units; Each of the detection units has an independent number identifiable by the processing unit; The processing unit is used to monitor the fire according to the signal transmitted by the detection unit, and locate the fire location according to the independent number of the detection unit; Each of the detection units includes a temperature sensing cable and a temperature sensing element, the temperature sensing element has the independent number and is used for contact temperature sensing and non-contact temperature sensing, wherein a temperature sensing window is provided on the temperature sensing element, and the temperature sensing cable is used for contact temperature sensing; In each of the direct detection units, one end of the temperature sensing cable is connected to the temperature sensing element, and the other end of the temperature sensing cable is used to connect to the processing unit; In each of the indirect detection units, one end of the temperature sensing cable is connected to the temperature sensing element, and the other end is used to connect to the temperature sensing element of another detection unit.

2. The heat-sensing fire detector according to claim 1, characterized in that: The temperature sensing cable is cabled in a multi-core twisted manner.

3. The heat-sensing fire detector according to claim 1, characterized in that: The temperature sensing cable and the temperature sensing element are connected by ultrasonic welding, infrared welding or laser welding.

4. The heat-sensing fire detector according to claim 1, characterized in that: A relay module is also connected between the temperature sensing cable and the temperature sensing element of the detection unit, and the relay module is used to amplify the received signal and then output it.

5. The heat-sensing fire detector according to claim 4, characterized in that: The relay module includes a temperature sensing cable amplifier circuit and a temperature sensing element amplifier circuit. The temperature sensing cable amplifier circuit is used to amplify the signal of the temperature sensing cable; The temperature sensing element amplifying circuit is used to amplify the signal of the temperature sensing element.

6. A fire monitoring method, characterized in that: A processing unit applied to a heat-sensing fire detector according to any one of claims 1 to 5, the method comprising: Obtaining the real-time temperature data returned by the detection unit, and obtaining the independent serial number of the detection unit; Determining the difference between the instantaneous temperature data and the historical temperature data of the detection unit; When the difference is greater than a first preset value, the fire location is determined according to the independent number and a fire alarm is issued.

7. The fire monitoring method according to claim 6, characterized in that: When the difference is not greater than the first preset value, the method further includes: Determining whether the difference is greater than a second preset value, wherein the second preset value is less than the first preset value; If so, record the detection unit corresponding to the independent number and issue an early warning; If not, the historical temperature data is updated according to the real-time temperature data.

8. The fire monitoring method according to claim 7, characterized in that: When the difference is greater than the second preset value and not greater than the first preset value, after recording the detection unit corresponding to the independent number and issuing an early warning, the method further includes: Determine the number of detection units that issue warnings in the same period; When the number is less than a preset number, the fire location is determined according to the independent number and a fire alarm is issued; When the number is not less than the preset number, the installation position of each of the early warning detection units is determined, and the first preset value is updated according to the installation position of each of the early warning detection units.

9. A fire monitoring method, characterized in that: A processing unit applied to a heat-sensing fire detector according to any one of claims 1 to 5, the method comprising: Obtaining the real-time temperature data returned by the detection unit, and obtaining the independent serial number of the detection unit; Comparing the instantaneous temperature value in the instantaneous temperature data with the alarm temperature value; When the instantaneous temperature value is greater than the alarm temperature value, the fire location is determined according to the independent number and a fire alarm is issued.

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