CN111696303B - Temperature sensing cable, temperature sensing fire detection system comprising same and temperature detection method - Google Patents
Temperature sensing cable, temperature sensing fire detection system comprising same and temperature detection method Download PDFInfo
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- CN111696303B CN111696303B CN202010635928.2A CN202010635928A CN111696303B CN 111696303 B CN111696303 B CN 111696303B CN 202010635928 A CN202010635928 A CN 202010635928A CN 111696303 B CN111696303 B CN 111696303B
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Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/06—Electric actuation of the alarm, e.g. using a thermally-operated switch
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- Fire-Detection Mechanisms (AREA)
Abstract
The invention provides a temperature sensing cable, comprising: the signal line comprises a positive electrode wire and a negative electrode wire which are arranged in parallel; a plurality of temperature sensing units disposed along the signal line between the positive and negative electrode leads at intervals, the temperature sensing units being configured to sense an ambient temperature and coupled to the signal line; and a self-restoring fuse electrically connected between adjacent temperature sensing units. According to the embodiment of the invention, the range of the ignition point can be accurately positioned, the detection distance is long, the detection precision is high, and the detection temperature can be displayed in real time.
Description
Technical Field
The invention relates to the field of temperature-sensing fire detection application, in particular to a temperature-sensing cable, a temperature-sensing fire detection system comprising the same and a temperature detection method.
Background
The linear temperature-sensing fire detector is fire detecting equipment used in cable tunnel, comprehensive pipe gallery, cable interlayer, cable shaft, traffic tunnel, subway, transformer station and other places, and its core component is sensitive component. The form of the sensitive parts can be divided into: cable, air tube, distributed optical fiber, fiber optic cable, wire-type multipoint. The most common types are cable and fiber optic cables and distributed optical fibers. The traditional cable type linear temperature-sensing detector consists of two different metal elastic wires coated with heat-sensitive materials, when the detector is heated, the heat-sensitive materials soften to cause the short circuit of the two wires with different materials to generate thermocouple effect, a detection module sends out instructions to measure the temperature of a short circuit point, and if the temperature of the short circuit point is lower than the alarm temperature, the short circuit fault alarm is triggered; and if the temperature of the short circuit point is higher than the alarm temperature, triggering a fire alarm. However, the traditional temperature-sensing cable type fire detector has the defects of short detection length, poor positioning accuracy, no temperature display function and the like. In addition, the optical fiber cable type fire disaster detector has the defects of high cost, fast light intensity attenuation of a light source, poor positioning precision, difficult connection and the like. The following table details the performance comparisons of several conventional temperature sensing cables.
The matters in the background section are only those known to the inventors and do not, of course, represent prior art in the field.
Disclosure of Invention
In view of at least one of the drawbacks of the prior art, the present invention provides a temperature sensing cable, comprising:
the signal line comprises a positive electrode wire and a negative electrode wire which are arranged in parallel;
a plurality of temperature sensing units disposed along the signal line between the positive and negative electrode leads at intervals, the temperature sensing units being configured to sense an ambient temperature and coupled to the signal line; and
and the self-recovery fuse is electrically connected between the adjacent temperature sensing units.
According to one aspect of the invention, the temperature sensing unit further comprises a metal wire or flexible PCB disposed between adjacent temperature sensing units, and the self-restoring fuse is coupled to the metal wire or flexible PCB.
According to one aspect of the present invention, the cable housing further includes a cable housing that encloses the signal wire, the temperature sensing unit, the self-restoring fuse, the metal wire, or the flexible PCB therein.
According to one aspect of the present invention, the signal line further includes a connection portion, the positive electrode wire includes a positive electrode conductor and an insulating layer covering the positive electrode conductor, the negative electrode wire includes a negative electrode conductor and an insulating layer covering the negative electrode conductor, the positive electrode conductor extends within the positive electrode wire, the negative electrode conductor extends within the negative electrode wire, and the connection portion is provided between the positive electrode wire and the negative electrode wire, connecting the positive electrode wire and the negative electrode wire together.
According to one aspect of the invention, the distance between two adjacent temperature sensing units is one meter, and 10-15 self-recovery fuses are arranged.
According to one aspect of the present invention, the connection portion is a flat structure, and the material of the connection portion is an insulating material.
According to one aspect of the invention, a plurality of mutually-spaced placing grooves are further arranged on the connecting part, and each temperature sensing unit is arranged in one of the placing grooves.
According to one aspect of the invention, wherein between the two temperature sensing units, the connection has one or more notched portions to expose the self-restoring fuse.
According to one aspect of the present invention, the temperature sensing unit includes a temperature sensor, a circuit board, and a control chip mounted on the circuit board, wherein a circuit parameter of the temperature sensor is changeable according to a change in temperature, the control chip is connected to the temperature sensor and can determine temperature information according to the circuit parameter of the temperature sensor, and the control chip is coupled to the signal line and configured to transmit the temperature information through the signal line.
According to an aspect of the present invention, wherein the temperature sensing unit is configured to be able to acquire electric power through the signal line.
According to one aspect of the invention, the temperature sensing unit and the adjacent temperature sensing unit form a passage, a self-recovery fuse between the two is also located in the passage, the temperature sensing unit is configured to sense a change in a circuit parameter of the self-recovery fuse in the passage due to a temperature change, and when the change in the circuit parameter exceeds a threshold value, the temperature sensing unit sends a fire alarm signal through the signal line.
According to one aspect of the invention, the circuit board is provided with a first bonding pad and a second bonding pad, the positive electrode wire is connected with the circuit board through the first bonding pad, and the negative electrode wire is connected with the circuit board through the second bonding pad.
According to one aspect of the invention, the temperature sensor is a thermistor, preferably a negative temperature coefficient thermistor, the thermistor is closely attached to the cable sheath, and the self-restoring fuse is a positive temperature coefficient thermistor.
The invention also relates to a temperature-sensing fire detection system, which comprises:
the temperature sensing cable according to any one of the preceding claims;
and the signal processing unit is coupled with the first end of the temperature sensing cable, receives data transmitted by the temperature sensing unit in the temperature sensing cable, and carries out fire alarm according to the data.
According to one aspect of the invention, the temperature sensing cable further comprises a terminal box, wherein the terminal box is coupled with the second end of the temperature sensing cable and seals the second end of the temperature sensing cable.
According to one aspect of the invention, wherein the signal processing unit receives temperature data from the temperature sensing unit.
According to an aspect of the present invention, each of the temperature sensing units has a unique address number, and the unique address number is included in data transmitted by the temperature sensing unit through the signal line.
According to one aspect of the invention, wherein the signal processing unit is configured to:
when the temperature sent by one of the temperature sensing units is higher than a first alarm temperature threshold value, triggering fire alarm; and/or
When the data sent by one of the temperature sensing units show that the temperature of the data in a certain time is higher than a second alarm temperature threshold value, a fire alarm is triggered.
According to one aspect of the invention, the first alarm temperature threshold is 60-85 ℃, preferably 85 ℃.
The invention also relates to a method for detecting temperature by using the temperature-sensitive fire detection system.
The embodiment of the invention overcomes the defects of the traditional temperature sensing detector, such as high cost and poor positioning precision of the optical fiber cable, and can accurately position the range of the ignition point, and has the advantages of long detection distance, high detection precision and real-time display of the detection temperature by providing the temperature sensing cable and the temperature sensing fire detection system comprising the same.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, serve to explain the invention. In the drawings:
FIG. 1 shows a schematic diagram of a temperature sensing cable according to one embodiment of the invention;
fig. 2 shows a schematic diagram of a temperature sensing cable according to another embodiment of the invention;
FIG. 3 shows a schematic cross-sectional view of the temperature-sensing cable signal line shown in FIG. 1;
FIG. 4 shows a schematic diagram of a temperature-sensitive fire detection system according to one embodiment of the invention;
FIG. 5 illustrates three modes of application of a temperature-sensitive fire detection system according to one embodiment of the invention; and
fig. 6 shows a schematic diagram of a fire alarm system according to an embodiment of the invention.
Detailed Description
Hereinafter, only certain exemplary embodiments are briefly described. As will be recognized by those of skill in the pertinent art, the described embodiments may be modified in various different ways without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature and not as restrictive.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be fixedly connected, detachably connected, or integrally connected, and may be mechanically connected, electrically connected, or may communicate with each other, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is less level than the second feature.
The following disclosure provides many different embodiments, or examples, for implementing different features of the invention. In order to simplify the present disclosure, components and arrangements of specific examples are described below. They are, of course, merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, which are for the purpose of brevity and clarity, and which do not themselves indicate the relationship between the various embodiments and/or arrangements discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art will recognize the application of other processes and/or the use of other materials.
The embodiments of the present invention will be described below with reference to the accompanying drawings, and it should be understood that the embodiments described herein are for illustration and explanation of the present invention only, and are not intended to limit the present invention.
Fig. 1 shows a schematic diagram of a temperature sensing cable according to an embodiment of the present invention, and fig. 2 shows a schematic diagram of a temperature sensing cable according to another embodiment of the present invention. The temperature sensing cable 100 will be described in detail with reference to fig. 1 and 2. As shown, the temperature sensing cable 100 (100-1 and 100-2 as shown in fig. 1 and 2) includes: a signal line 10 (10-1 and 10-2 as shown in fig. 1 and 2), a plurality of temperature sensing units 20 (20-1 and 20-2 as shown in fig. 1 and 2), and a self-restoring fuse 30. Wherein the signal line 10 includes a positive electrode lead 11 and a negative electrode lead 12, the positive electrode lead 11 and the negative electrode lead 12 being arranged in parallel, the temperature sensing unit 20 being disposed along the signal line 10 between the positive electrode lead 11 and the negative electrode lead 12 at a distance from each other, the temperature sensing unit 20 being configured to sense an ambient temperature and being coupled to the signal line 10. Specifically, the temperature sensing unit 20 is coupled to the signal line 10 by welding with the positive and negative electrode leads 11 and 12. The self-restoring fuses 30 are electrically connected between the adjacent temperature sensing units 20, alternatively, the distance between the adjacent two temperature sensing units 20 is one meter, and 10-15 self-restoring fuses 30 are provided. The neighboring self-restoring fuses 30, and the self-restoring fuses 30 and the temperature sensing unit 20 may be electrically connected by wires. According to a preferred embodiment of the present invention, the temperature sensing cable 100 is a single length of up to 1000 meters, and accordingly, up to 1000 temperature sensing units 20 may be provided in one of the temperature sensing cables 100. Wherein the self-healing fuse 30 is optionally a positive temperature coefficient thermistor, which is a semiconductor resistor with temperature sensitivity, is low in normal operation, and has a resistance value which increases almost stepwise with increasing temperature when the ambient temperature or current exceeds a certain threshold value once. When the temperature is reduced, the self-healing fuse 30 may automatically heal for reuse.
According to one embodiment of the present invention, as shown in fig. 1, the temperature sensing cable 100-1 further includes a metal wire 31 disposed between adjacent temperature sensing units 20-1, the self-restoring fuse 30 is coupled to the metal wire 31, and the self-restoring fuse 30 is electrically connected with the temperature sensing units 20-1 through the metal wire 31.
Fig. 3 shows a schematic cross-sectional view of the temperature sensing cable signal line shown in fig. 1. As shown, the signal line 10-1 for the temperature sensing cable 100-1 includes: positive electrode lead 11, negative electrode lead 12, and connection portion 13-1. Wherein the positive electrode lead 11 comprises a positive electrode conductor 15 and an insulating layer 16, and the insulating layer 16 wraps the positive electrode conductor 15. The negative electrode lead 12 includes a negative electrode conductor 17 and an insulating layer 18, the insulating layer 18 covers the negative electrode conductor 17, and the positive electrode lead 11 and the negative electrode lead 12 are arranged in parallel. The connection portion 13-1 is of a flat structure, and is also made of an insulating material, and is disposed between the parallel positive electrode lead 11 and negative electrode lead 12, so as to connect the positive electrode lead 11 and the negative electrode lead 12 together. The connection portion 13-1, the insulating layer 16 of the positive electrode lead 11, and the insulating layer 18 of the negative electrode lead 12 are preferably integrally formed of the same material. According to a preferred embodiment of the invention, the wire diameters of the positive and negative conductors 15, 17 are 1-2 square millimeters. The positive and negative conductors 15, 17 may be made of conventional copper wire. According to an embodiment of the present invention, a metallic wire groove 14 extending in the longitudinal direction of the signal wire 10-1 is provided on the connection portion 13-1 of the signal wire 10-1, and the metallic wire 31 is provided in the metallic wire groove 14. The metallic wire groove 14 is preferably configured in a shape of a combination of a flare and three-quarters of a circle to ensure that the metallic wire 31 is easily inserted into the metallic wire groove 14 along the guiding of the notch and is caught after the insertion, and is not easily dropped out. Preferably, the diameter of the metallic wire groove 14 is set to 1.2 mm.
According to an embodiment of the present invention, as shown in fig. 2, the temperature sensing cable 100-2 includes a flexible PCB 32 disposed between adjacent temperature sensing units 20-2 in addition to the signal line 10-2, the plurality of temperature sensing units 20-2, and the self-restoring fuse 30, as compared to the temperature sensing cable 100-1. The self-restoring fuse 30 is coupled to the flexible PCB 32, and the self-restoring fuse 30 is electrically connected to the temperature sensing unit 20-2 through the flexible PCB 32. According to an embodiment of the present invention, in particular, the self-healing fuse 30 is coupled with the flexible PCB 32 through a chip mounting process, or by providing a placement hole 33 at a corresponding position on the flexible PCB 32, and the self-healing fuse 30 is coupled with the flexible PCB 32 by being soldered at both ends of the placement hole 33. In addition, the temperature sensing cable 100-2 has a signal line 10-2 different from the temperature sensing cable 100-1. Specifically, the signal line 10-2 includes the same positive electrode lead 11, negative electrode lead 12, and different connection portion 13-2 as in the signal line 10-1, wherein the connection portion 13-2 is solid at its middle flat portion and rectangular in cross section as compared to the connection portion 13-1, and there is no metallic lead groove 14 on the connection portion 13-2 because it is coupled to the self-restoring fuse 30 through the flexible PCB 32 provided on the temperature sensing unit 20-2. Other features of the signal line 10-2 are the same as those of the signal line 10-1, and will not be described here again.
According to one embodiment of the present invention, as shown in fig. 1 and 2, the temperature sensing cable 100 further includes a cable sheath 40, and the cable sheath 40 encloses the signal wire 10, the temperature sensing unit 20, the self-restoring fuse 30, the metal wire 31 or the flexible PCB 32 therein. The cable sheath 40 is optionally a thermoplastic polyurethane polymer insulating material, and has the characteristics of high strength, good toughness, friction resistance, good weather resistance, mechanical stretching resistance, corrosion resistance, wear resistance, cold resistance, oil resistance, water resistance, aging resistance and the like, and the cable sheath 40 is tightly wrapped on the surface of the internal signal wire 10, the temperature sensing unit 20, the self-recovery fuse 30, the metal wire 21 or the flexible PCB 32, so as to protect and protect the internal devices. When the cable sheath 40 is packaged, the cable sheath 40 is directly and tightly attached to the signal wire 10 and the components of the temperature sensing unit 20 in a vacuum pumping mode in the extrusion molding die, so that the influence of the heat conduction due to the existence of a bubble heat insulation layer in the cable is avoided.
According to an embodiment of the present invention, as shown in fig. 1 and 2, the thickness of the connection portion 13 of the signal line 10 is smaller than the diameter of the positive electrode wire 11 and/or the negative electrode wire 12, and the connection portion 13 is made of an insulating material. Preferably, the width of the connecting portion 13 is 5-7 mm, the thickness is 1.5-2 mm, and the material of the connecting portion 13 is thermoplastic polyurethane polymer insulation material. As shown in fig. 1 and 2, the insulating layer 16 of the positive electrode lead 11, the insulating layer 18 of the negative electrode lead 12, and the connection portion 13 are preferably integrated together and manufactured integrally.
According to an embodiment of the present invention, as shown in fig. 1 and 2, the connection part 13 is provided with a plurality of spaced apart slots 50, and each of the temperature sensing units 20 is disposed in one of the slots 50. The placement groove 50 may be a hollowed-out portion of the connection portion 13. According to a preferred embodiment of the invention, the cross section of the placement groove 50 is 1.5mm x6mm and is produced by a punching process.
In the temperature sensing cable 100-1 shown in fig. 1, the metal wire 31 coupled with the self-restoring fuse 30 is placed in the metal wire groove 14 (see fig. 3), and then the metal wire 31 may be closed in the metal wire groove 14 by a melted plastic insulating material. It is further preferable that the connection portion 13-1 has one or more notch portions 60 (i.e., an opening portion on a closing portion formed of a plastic insulating material) between two adjacent temperature sensing units 20 to expose the self-restoring fuse 30, and the exposed self-restoring fuse 30 is disposed closely to the cable sheath 40 when the cable sheath 40 is enclosed, and the self-restoring fuse 30 can follow the change of the external environment temperature more timely due to the packing material of only the cable sheath 40. The one or more notch portions 60 are exposed points of the self-restoring fuse 30, i.e., temperature detection points of the temperature sensing cable 100-1. In this way, the self-healing fuse 30 is able to more accurately detect small changes in ambient temperature.
According to one embodiment of the present invention, as shown in fig. 1 and 2, wherein the temperature sensing unit 20 includes a temperature sensor 21, a circuit board 22, and a control chip 23 mounted on the circuit board 22, wherein a circuit parameter of the temperature sensor 21 may be changed according to a change in temperature, temperature information at the temperature sensing unit 20 is monitored in real time, the control chip 23 is connected to the temperature sensor 21 and may determine temperature information according to the circuit parameter of the temperature sensor 21, and the control chip 23 is coupled to the signal line 10 and configured to transmit the temperature information through the signal line 10. Preferably, the control chip 23 is configured to trigger a high temperature alarm when the temperature sensed by the temperature sensor 21 exceeds a temperature threshold or when the temperature rises too fast, and to transmit an alarm signal through the signal line 10.
According to one embodiment of the present invention, as shown in fig. 1 and 2, in which the temperature sensing unit 20 and the temperature sensing unit adjacent thereto form a path in which the self-recovering fuse 30 is also located, the temperature sensing unit 20 (chip 23) is configured to sense a change in a circuit parameter of the self-recovering fuse 30 due to a temperature change in the path, and the temperature sensing unit 20 transmits a fire alarm signal through the signal line 10 when the change in the circuit parameter exceeds a threshold value.
According to one embodiment of the present invention, as shown in fig. 1 and 2, the circuit board 22 is provided with a first bonding pad 24 and a second bonding pad 25, the positive electrode lead 11 is connected to the circuit board 22 at the first bonding pad 24 through the positive electrode conductor 15, the negative electrode lead 12 is connected to the circuit board 22 at the second bonding pad 25 through the negative electrode conductor 17, and the first bonding pad 24 and the second bonding pad 25 are designed as two half metallized holes in parallel to facilitate reliable welding together of the positive electrode conductor and the negative electrode conductor.
According to an embodiment of the present invention, the circuit board 22 of the temperature sensing unit 20 is further provided with a third pad 26 and a fourth pad 27. As shown in fig. 1, the temperature sensing unit 20-1 of the temperature sensing cable 100-1 further includes two connection plates 28, wherein one ends of the two connection plates 28 are electrically connected to the circuit board 22 through a third pad 26 and a fourth pad 27, respectively, so that a self-restoring fuse 30 can be connected to the circuit board 22 through the metal wires 31, the connection plates 28, respectively. Preferably, the connection board 28 is a PCB flexible board. As shown in fig. 2, the circuit board 22 on the temperature sensing unit 20-2 of the temperature sensing cable 100-2 is electrically connected with the flexible PCB 32 through the third pad 26 and the fourth pad 27, respectively, so that the self-restoring fuse 30 can be connected with the circuit board 22 through the flexible PCB 32.
According to one embodiment of the present invention, the temperature sensor 21 in the temperature sensing cable 100 is configured as a thermistor, preferably a negative temperature coefficient thermistor, which is closely attached to the cable sheath 40, and the distance between adjacent temperature sensing control units 20 is 90-100 cm, preferably 100 cm, so as to precisely locate the ignition point within a range of one meter.
In addition, according to an embodiment of the present invention, as shown in fig. 1 and 2, the signal line 10 may be used not only to transmit signal data but also to supply power to the temperature sensing unit 20. The temperature sensing unit 20 is electrically connected to the positive electrode lead 11 and the negative electrode lead 12 through the first bonding pad 24 and the second bonding pad 25, and may be used for transmitting signals (for example, between the chip 23 and the outside), and may also be used for powering various devices (for example, the control chip 23) on the temperature sensing unit 20, which will not be described herein.
Compared with the existing signal line, the signal line 10 shown in fig. 1 and 2 integrates the positive electrode lead 11 and the negative electrode lead 12, and the relative positions of the positive electrode lead 11 and the negative electrode lead 12 are not easy to twist or change in the deployment process when the temperature sensing cable 100 is installed, particularly when the temperature sensing cable is used. The flat signal wire 10 more conveniently places the temperature sensing unit circuit board 22 and other electronic components of the temperature sensing cable 100 in the placement groove 50 arranged in the connecting part 13, and the circuit board 22 and the electronic components are not higher than the insulating layer of the signal wire 10, so that the insulating layer better protects the electronic components from being extruded and damaged; the integral signal wire 10 can also make the response of the exposed point of the self-recovery fuse arranged on the notch part 60 of the connecting part 13 to the temperature more consistent according to the comparison rule of the appearance and the size of the temperature sensing cable, namely, the consistency of the response of all detection points of the whole wire to the ambient temperature is ensured. When the integral signal wire 10 is pulled by external force, the positive electrode lead 11 and the negative electrode lead 12 are uniformly stressed, so that the welding spots welded on the signal wire 10 are not sprained, and the reliability of the product is ensured.
The present invention also relates to a temperature-sensitive fire detection system, as shown in fig. 4, which is a schematic diagram of a temperature-sensitive fire detection system according to an embodiment of the present invention. As shown, the temperature-sensitive fire detection system 500 includes one or more of the temperature-sensitive cables 100 and a signal processing unit 200. The temperature sensing cable 100 collects the ambient temperature in real time and monitors the cable status, and the signal processing unit 200 is coupled to the first end of the temperature sensing cable 100, and is configured to receive the data transmitted by the temperature sensing unit 20 in the temperature sensing cable 100, perform query, analysis, and processing, and perform fire alarm according to the data. According to an embodiment of the present invention, the signal processing unit 200 may be externally connected to 1 to 3 temperature sensing cables 100. According to a preferred embodiment of the present invention, the signal processing unit 200 further includes an indicator light, a nixie tube, and a plurality of ports (not shown in the figure), and the technical parameters thereof are as follows: the rated voltage is DC24V, and the working range is DC 20V-DC 28V; the power under normal conditions is 5W, and the alarm power is less than or equal to 14W; the indicator light is set to three colors in three cases: fire alarm (red), fault (yellow), running (green); the ports respectively comprise 1 RS485 (MODBUS protocol) port, 1 CAN port, 3 passive dry contact output ports (fire alarm, fault, auxiliary control), 1 fire protection loop port and 1 temperature sensing cable channel port.
According to an embodiment of the present invention, as shown in fig. 4, the temperature-sensing fire detection system 500 further includes a terminal box 300, the terminal box 300 is coupled to the second end of the temperature-sensing cable 100, seals the second end of the temperature-sensing cable 100, and is configured to monitor the communication state of the temperature-sensing cable 100 between the signal processing unit 200 and the terminal box 300, and timely feedback whether the alarm information exists in the cable. According to an embodiment of the present invention, the terminal boxes 300 are closed devices, and the wire inlet is provided with a soft rubber sealing waterproof device, so that the protection level of the IP66 can be met, and each terminal box 300 seals one temperature sensing cable 100. According to a preferred embodiment of the present invention, the technical parameters of the terminal box 300 are set as follows: rated voltage DC24V, working range DC 20V-DC 28V, flame-retardant ABS plastic, and shell protection grade IP67.
According to one embodiment of the present invention, each of the temperature sensing units 20 in the temperature sensing cable 100 has a unique serial number ID or address number. When the temperature sensing unit 20 sends temperature information or alarm signals through the signal line 10, the data will be provided with the serial number ID or address number. The signal processing unit 200 is a control center of the temperature sensing fire detection system 500, and the signal processing unit 200 receives real-time temperature information from the temperature sensing unit 20 and processes the information to determine whether a fire occurs in an area where the temperature sensing cable 100 is located. The specific position of the temperature sensing unit 20 where the corresponding event occurs can be known according to the attached unique number ID or unique address number to precisely locate the ignition point.
According to one embodiment of the invention, wherein the signal processing unit 200 is configured to: the real-time temperature value and the temperature change condition of the area where the temperature sensing cable 100 is located can be inquired, monitored and analyzed. Specifically, when the temperature transmitted by one of the temperature sensing units 20 is higher than the first alarm temperature threshold value, a fire alarm is triggered; and/or when the data transmitted by one of the temperature sensing units 20 shows that its temperature rises above the second alarm temperature threshold for a certain period of time (i.e. the temperature rises too fast), a fire alarm is triggered. Wherein the first alarm temperature threshold is 60-85 ℃, preferably 85 ℃. Those skilled in the art will appreciate that the signal processing unit 200 may also be configured to set various alarm temperatures in zones.
Fig. 5 illustrates three modes of application of the temperature-sensitive fire detection system according to one embodiment of the present invention. As shown in the drawing, in the application mode, one end of the temperature sensing cable 100 is coupled to the signal processing unit 200, and the other end is coupled to the terminal box 300, and the temperature sensing cable 100 and the terminal box 300 are simultaneously disposed in a detection area, and the temperature in the detection area is sensed to monitor fire. In this mode, the detection area is the furthest, i.e. the length of the temperature sensing cable 100 is 1000 meters. In the second application mode, one end of the temperature sensing cable 100 is coupled to the signal processing unit 200 through a common twisted pair cable with a length of 1.5 square millimeters, and the other end is coupled to the terminal box 300, and the temperature sensing cable 100 and the terminal box 300 are simultaneously placed in a detection area to sense the temperature in the detection area and monitor fire. In this mode, detection of a farther detection area can be achieved by adjusting the length of the normal twisted pair cable. In the third application mode, the connection of the temperature sensing cable 100 is the same as that of the first application mode, but the temperature sensing cable 100 and the terminal box 300 are respectively distributed in four detection areas with different temperatures, namely, a detection area 1, a detection area 2, a detection area 3 and a detection area 4. In this mode, the temperature-sensitive fire detection system 500 may sense and alarm the temperature of different detection areas independently, respectively. The second application mode and the third application mode make the application range of the temperature-sensing fire detection system 500 wider and the application scenario more diverse. It will be appreciated by those skilled in the art that the application scope of the temperature-sensitive fire detection system 500 is not limited to the above three application modes, and other application modes modified according to specific needs are also within the scope of the present invention.
Fig. 6 shows a schematic diagram of a fire alarm system according to an embodiment of the invention. As shown, the fire alarm system 700 includes the temperature sensitive fire detection system 500, a fire alarm controller 710, communication lines 720, and other devices 730. Wherein the temperature-sensitive fire detection system 500 is used for sensing and monitoring the temperature of a detection area, and wherein the signal processing unit 200 is coupled with the fire alarm controller 710 and other devices 730 through communication lines 720, respectively. When the fire alarm system 700 is activated, the temperature sensing cable 100 transmits real-time temperature data to the signal processing unit 200 for analysis and processing, and the fire alarm controller 710 controls the execution and activation of a fire alarm executor (not shown) such as an alarm bell, a fire sprinkler head, a fire door, etc., according to the temperature information transmitted from the signal processing unit 200, and the other devices 730 receive the information of the signal processing unit 200 and function when the temperature sensing fire detection system 500 fails. In the present embodiment, only one application of the temperature-sensitive fire detection system 500 to the fire alarm system 700 is schematically shown.
The invention also relates to a method for detecting the temperature by using the temperature-sensitive fire detection system 500.
The embodiment of the invention overcomes the defects of the traditional cable type linear temperature-sensing detector, such as high cost and poor positioning precision of the optical fiber cable, can accurately position the range of the ignition point, has long detection distance and high detection precision, and can display the detection temperature in real time by providing the temperature-sensing cable and the temperature-sensing fire detection system comprising the same. Compared with the traditional optical fiber cable, the optical fiber cable has the advantages of being free from light intensity attenuation of a light source, being free from external stress influence, being free from vibration influence and the like. And the temperature sensing cable has the advantages of simple structure, low cost, high strength and wider application.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (19)
1. A temperature-sensitive cable, comprising:
the signal line comprises a positive electrode wire and a negative electrode wire which are arranged in parallel;
a plurality of temperature sensing units disposed along the signal line between the positive and negative electrode leads at intervals, the temperature sensing units configured to sense an ambient temperature and coupled to the signal line, wherein the temperature sensing units include a temperature sensor, a circuit board, and a control chip mounted on the circuit board, wherein a circuit parameter of the temperature sensor is changeable according to a change in temperature, the control chip is connected to the temperature sensor and can determine temperature information according to the circuit parameter of the temperature sensor, and the control chip is coupled to the signal line and configured to transmit the temperature information through the signal line; and
and the self-recovery fuse is electrically connected between the adjacent temperature sensing units.
2. The temperature-sensing cable of claim 1, further comprising a metal wire or flexible PCB disposed between adjacent temperature-sensing units, the self-restoring fuse being coupled to the metal wire or flexible PCB.
3. The temperature-sensitive cable of claim 2, further comprising a cable sheath encasing the signal wire, temperature-sensitive unit, self-restoring fuse, metal wire, or flexible PCB therein.
4. A temperature sensing cable according to any one of claims 1-3, wherein the signal wire further comprises a connection portion, the positive electrode wire comprises a positive electrode conductor and an insulating layer, the insulating layer encases the positive electrode conductor, the negative electrode wire comprises a negative electrode conductor and an insulating layer encases the negative electrode conductor, the positive electrode conductor extends within the positive electrode wire, the negative electrode conductor extends within the negative electrode wire, and the connection portion is disposed between the positive electrode wire and the negative electrode wire, connecting the positive electrode wire and the negative electrode wire together.
5. A temperature sensing cable according to any one of claims 1-3, wherein the spacing between adjacent two temperature sensing units is one meter and 10-15 of the self-healing fuses are provided.
6. The temperature-sensitive cable according to claim 4, wherein the connecting portion is of a flat structure, and the connecting portion is made of an insulating material.
7. The temperature-sensing cable of claim 6, wherein a plurality of spaced apart slots are further provided on the connection portion, each of the temperature-sensing units being disposed in one of the slots.
8. The temperature-sensing cable of claim 6, wherein the connection portion has one or more notched portions between two of the temperature-sensing units to expose the self-restoring fuse.
9. A temperature sensing cable according to any one of claims 1-3, wherein the temperature sensing unit is configured to be able to obtain electrical power through the signal line.
10. A temperature sensing cable according to any one of claims 1 to 3, wherein the temperature sensing unit and the temperature sensing unit adjacent thereto form a passageway in which a self-healing fuse therebetween is also located, the temperature sensing unit being configured to sense a change in a circuit parameter of the self-healing fuse due to a change in temperature in the passageway, the temperature sensing unit sending a fire alarm signal over the signal line when the change in the circuit parameter exceeds a threshold value.
11. The temperature-sensing cable of claim 1, wherein the circuit board is provided with a first pad and a second pad, the positive electrode wire is connected to the circuit board through the first pad, and the negative electrode wire is connected to the circuit board through the second pad.
12. A temperature sensing cable according to claim 1, wherein the temperature sensor is a thermistor, preferably a negative temperature coefficient thermistor, which is in close proximity to the cable sheath, the self-healing fuse being a positive temperature coefficient thermistor.
13. A temperature-sensitive fire detection system, comprising:
the temperature-sensitive cable of any one of claims 1-12;
and the signal processing unit is coupled with the first end of the temperature sensing cable, receives data transmitted by the temperature sensing unit in the temperature sensing cable, and carries out fire alarm according to the data.
14. The temperature-sensitive fire detection system of claim 13, further comprising a terminal enclosure coupled to the second end of the temperature-sensitive cable, closing the second end of the temperature-sensitive cable.
15. A temperature-sensitive fire detection system according to claim 13 or 14, wherein the signal processing unit receives temperature data from the temperature sensing unit.
16. A temperature-sensitive fire detection system according to claim 13 or 14, wherein each of the temperature-sensitive units has a unique address number, the unique address number being included in data transmitted by the temperature-sensitive unit through the signal line.
17. The temperature-sensitive fire detection system according to claim 13 or 14, wherein the signal processing unit is configured to:
when the temperature sent by one of the temperature sensing units is higher than a first alarm temperature threshold value, triggering fire alarm; and/or
When the data sent by one of the temperature sensing units show that the temperature of the data in a certain time is higher than a second alarm temperature threshold value, a fire alarm is triggered.
18. A temperature sensitive fire detection system according to claim 17, wherein the first alarm temperature threshold is 60-85 ℃, preferably 85 ℃.
19. A method of temperature detection using a temperature-sensitive fire detection system as claimed in any one of claims 13 to 18.
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| US11674852B1 (en) * | 2019-09-06 | 2023-06-13 | Robert T. Lapeyre | Stirring paddle with integrated sensor |
| CN211699808U (en) * | 2020-05-11 | 2020-10-16 | 江苏中利集团股份有限公司 | Temperature-sensing fire detection cable |
| CN114255561A (en) * | 2021-12-21 | 2022-03-29 | 中车大连机车研究所有限公司 | Novel cable type linear temperature-sensing detector |
| CN114898938A (en) * | 2022-05-26 | 2022-08-12 | 广州番禺电缆集团有限公司 | Intelligent cable device with temperature monitoring and displaying function |
| CN116343426B (en) * | 2023-03-20 | 2023-09-08 | 享成安全科技(南京)有限公司 | Cable type linear temperature-sensing fire detector with position indication and use method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03100392U (en) * | 1990-01-31 | 1991-10-21 | ||
| CN101078654A (en) * | 2007-07-05 | 2007-11-28 | 张陈 | Recoverable cable type linear temperature-sensing detector |
| CN102592392A (en) * | 2012-03-06 | 2012-07-18 | 曾学义 | Linear temperature sensing fire detector and alarm method thereof |
| CN204331969U (en) * | 2014-12-09 | 2015-05-13 | 江苏中实电子有限公司 | A kind of locate mode line-type heat detector |
| CN105869339A (en) * | 2016-06-17 | 2016-08-17 | 无锡圣敏传感科技股份有限公司 | Line type heat fire detector |
| CN110796820A (en) * | 2019-12-06 | 2020-02-14 | 无锡圣敏传感科技股份有限公司 | Temperature-sensing fire detector and fire monitoring method |
| CN213182997U (en) * | 2020-07-03 | 2021-05-11 | 青鸟消防股份有限公司 | Temperature sensing cable and temperature sensing fire detection system comprising same |
-
2020
- 2020-07-03 CN CN202010635928.2A patent/CN111696303B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03100392U (en) * | 1990-01-31 | 1991-10-21 | ||
| CN101078654A (en) * | 2007-07-05 | 2007-11-28 | 张陈 | Recoverable cable type linear temperature-sensing detector |
| CN102592392A (en) * | 2012-03-06 | 2012-07-18 | 曾学义 | Linear temperature sensing fire detector and alarm method thereof |
| CN204331969U (en) * | 2014-12-09 | 2015-05-13 | 江苏中实电子有限公司 | A kind of locate mode line-type heat detector |
| CN105869339A (en) * | 2016-06-17 | 2016-08-17 | 无锡圣敏传感科技股份有限公司 | Line type heat fire detector |
| CN110796820A (en) * | 2019-12-06 | 2020-02-14 | 无锡圣敏传感科技股份有限公司 | Temperature-sensing fire detector and fire monitoring method |
| CN213182997U (en) * | 2020-07-03 | 2021-05-11 | 青鸟消防股份有限公司 | Temperature sensing cable and temperature sensing fire detection system comprising same |
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