CN111696302A - 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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- CN111696302A CN111696302A CN202010635482.3A CN202010635482A CN111696302A CN 111696302 A CN111696302 A CN 111696302A CN 202010635482 A CN202010635482 A CN 202010635482A CN 111696302 A CN111696302 A CN 111696302A
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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
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- 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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Abstract
The present invention provides a temperature sensing cable, including: the signal wire comprises a positive wire and a negative wire, and the positive wire and the negative wire are arranged in parallel; a plurality of temperature sensing units disposed between the positive electrode lead and the negative electrode lead at intervals along the signal line, the temperature sensing units being configured to sense an ambient temperature and coupled to the signal line; and adjacent temperature sensing units are connected by the fuse wire. By 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
A linear temperature-sensing fire detector is used in places such as cable tunnels, comprehensive pipe galleries, cable interlayers, cable shafts, traffic tunnels, subways, transformer substations and the like, and a core component of the linear temperature-sensing fire detector is a sensitive component. The form of the sensitive component can be divided into: cable, air tube, distributed fiber, fiber optic cable, wire, multi-point. The most common types of which are cable and fiber optic cables and distributed optical fibers. When the detector is heated, the thermosensitive material is softened to cause the short circuit of the two wires made of different materials to generate a thermocouple effect, a detection module sends an instruction to measure the temperature of a short circuit point, and if the temperature of the short circuit point is lower than an alarm temperature, a 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 conventional temperature sensing cable type fire detector has the defects of short detection length, poor positioning accuracy, no temperature display function and the like. In another optical fiber cable type fire detector, the optical fiber cable 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 comparison of the performance of several conventional temperature sensitive cables.
The statements in this background section merely represent techniques known to the public and are not, of course, representative of the prior art.
Disclosure of Invention
In view of at least one of the drawbacks of the prior art, the present invention provides a temperature-sensitive cable including:
the signal wire comprises a positive wire and a negative wire, and the positive wire and the negative wire are arranged in parallel;
a plurality of temperature sensing units disposed between the positive electrode lead and the negative electrode lead at intervals along the signal line, the temperature sensing units being configured to sense an ambient temperature and coupled to the signal line; and
and the adjacent temperature sensing units are connected by the fuse wire.
According to one aspect of the invention, the cable protection sleeve is used for covering the signal wire, the temperature sensing unit and the fusible link.
According to an aspect of the present invention, the signal line further includes a connection portion, the positive wire includes a positive conductor and an insulating layer, the insulating layer covers the positive conductor, the negative wire includes a negative conductor and an insulating layer, the insulating layer covers the negative conductor, the positive conductor extends inside the positive wire, the negative conductor extends inside the negative wire, and the connection portion is disposed between the positive wire and the negative wire to connect the positive wire and the negative wire together.
According to an 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 an aspect of the present invention, wherein the connecting portion is provided with a fuse groove in which the fuse is disposed.
According to an aspect of the present invention, a plurality of placing grooves are further provided on the connecting portion, and each of the temperature sensing units is provided in one of the placing grooves.
According to an aspect of the invention, wherein between the two temperature sensing units, the connecting portion has one or more notch portions to expose the fusible link.
According to an aspect of the invention, wherein the cross-section of the fuse wire groove is configured in a shape of a flare combined with a three-quarter circle.
According to an aspect of the invention, wherein the fuse is set in a relaxed state within the fuse slot.
According to an aspect of the present invention, wherein the temperature sensing unit includes a thermistor whose circuit parameter is variable according to a change in temperature, a circuit board, and a control chip mounted on the circuit board, the control chip being connected to the thermistor and determining temperature information according to the circuit parameter of the thermistor, the control chip being 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 obtain electric power through the signal line.
According to an aspect of the invention, wherein the temperature sensing unit is configured to sense a fuse wire connected thereto, and when the fuse wire is fused, the temperature sensing unit is configured to send a disconnection signal through the signal line.
According to an aspect of the present invention, wherein the temperature sensing unit and the temperature sensing unit adjacent thereto form a path in which a weak current passes when a fuse between the two is not fused; the circuit becomes an open circuit when a fuse between the two is blown, the open circuit having no current therein, the temperature sensing unit being configured to send an open circuit signal through the signal line when the current is not detected.
According to an aspect of the present invention, the circuit board is provided with a first pad and a second pad, the positive electrode lead is connected to the circuit board through the first pad, and the negative electrode lead is connected to the circuit board through the second pad.
According to one aspect of the invention, the thermistor is a negative temperature coefficient thermistor, the negative temperature coefficient thermistor is tightly attached to the cable sheath, and the distance between adjacent temperature sensing control units is 90-100 cm.
The present invention also relates to a temperature-sensitive fire detection system, comprising:
the temperature-sensitive cable according to any one of the above;
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 an aspect of the present invention, further comprising a terminal closure coupled to the second end of the temperature sensing cable for closing the second end of the temperature sensing cable.
According to an aspect of the invention, wherein the signal processing unit receives temperature data and/or trip 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 an aspect of the invention, wherein the signal processing unit is configured to:
when the temperature sent by one temperature sensing unit is higher than a first alarm temperature threshold value, triggering fire alarm; and/or
And when the temperature of one temperature sensing unit is higher than a second alarm temperature threshold value within a certain time, the fire alarm is triggered.
According to one aspect of the invention, wherein said first alarm temperature threshold is 60-85 ℃, preferably 85 ℃.
The present invention also relates to a method of temperature detection using the temperature sensitive fire detection system as described in any one of the above.
The embodiment of the invention overcomes the functional defects of the traditional cable type linear temperature-sensing detector and the defects of high cost and poor positioning precision of an optical fiber cable by providing the temperature-sensing cable and the temperature-sensing fire detection system comprising the same, can accurately position the range of a fire point, has long detection distance and high detection precision, and can display the detection temperature in real time.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 shows a schematic view of a temperature sensitive cable according to one embodiment of the present invention;
FIG. 2 shows a schematic diagram of a signal line according to one embodiment of the invention;
FIG. 3 shows a cross-sectional schematic of a signal line according to one embodiment of the invention;
FIG. 4 illustrates a connection diagram of a temperature sensing unit and a fuse according to an embodiment of the present invention;
FIG. 5 shows a schematic diagram of a temperature sensitive fire detection system according to one embodiment of the invention;
FIG. 6 illustrates three modes of application of a temperature sensitive fire detection system according to one embodiment of the present invention; and
fig. 7 shows a schematic diagram of a fire alerting system according to one embodiment of the present invention.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments may be modified in various different ways, all 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 is to 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", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.
The embodiments of the present invention will be described in conjunction with the accompanying drawings, and it should be understood that the embodiments described herein are only for the purpose of illustrating and explaining the present invention, and are not intended to limit the present invention.
Fig. 1 shows a schematic view of a temperature sensitive cable according to one embodiment of the present invention. As shown in the drawing, the temperature sensing cable 100 includes: a signal line 10, a plurality of temperature sensing units 20, and a 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 are arranged in parallel, the temperature sensing unit 20 is disposed between the positive electrode lead 11 and the negative electrode lead 12 at intervals along the signal line 10, the temperature sensing unit 20 is configured to sense an ambient temperature and is coupled to the signal line 10. Specifically, the temperature sensing unit 20 is coupled to the positive electrode lead 11 and the negative electrode lead 12 by welding to form a signal line 10. The adjacent temperature sensing units 20 are connected by the fusible links 30. According to a preferred embodiment of the present invention, the temperature sensitive cable 100 is single up to 1000 meters long. Wherein the fusible link 30 is preferably an alloy material with a melting point between 160 and 220 ℃ and a diameter of 0.8 mm, such as a nickel-tin alloy.
According to an embodiment of the present invention, as shown in fig. 1, the temperature sensing cable 100 further includes a cable sheath 40, and the signal line 10, the temperature sensing unit 20 and the fuse 30 are covered by the cable sheath 40. 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 surfaces of the internal signal line 10, the temperature sensing unit 20 and the fusible link 30, so as to protect and protect the internal devices. When encapsulating cable sheath 40, through the mode at the inside evacuation of extrusion molding mould, make cable sheath 40 and signal line 10, temperature sensing unit 20's components and parts directly closely laminate, avoid the inside bubble insulating layer that has of cable and influence the heat conduction.
Fig. 2 shows a schematic diagram of a signal line according to an embodiment of the invention. As shown in the drawing, the signal line 10 for the temperature-sensitive cable 100 includes: a positive electrode lead 11, a negative electrode lead 12, and a connection portion 13. The positive electrode lead 11 comprises a positive electrode conductor 15 and an insulating layer 16, and the insulating layer 16 covers the positive electrode conductor 15. The cathode lead 12 comprises a cathode conductor 17 and an insulating layer 18, the insulating layer 18 coats the cathode conductor 17, and the anode lead 11 and the cathode lead 12 are arranged in parallel. The connecting portion 13 is of a flat structure, is also made of an insulating material, and is disposed between the parallel positive electrode lead 11 and the negative electrode lead 12 to connect the positive electrode lead 11 and the negative electrode lead 12 together. The connection portion 13, the insulating layer 16 of the positive electrode lead 11, and the insulating layer 18 of the negative electrode lead 12 may be integrally formed of the same material. According to a preferred embodiment of the present invention, the wire diameter of the positive conductor 15 and the negative conductor 17 is 1 to 2 mm square. The positive conductor 15 and the negative conductor 17 may be made of a common copper wire. According to an embodiment of the present invention, a fuse groove 14 extending in a longitudinal direction of the signal line 10 is provided on the connection portion 13 of the signal line 10, and the fuse 30 is provided in the fuse groove 14. Preferably, the diameter of the fuse wire groove 14 is set to 1.2 mm.
According to an embodiment of the present invention, the thickness of the connecting portion 13 is smaller than the diameter of the positive electrode lead 11 and/or the negative electrode lead 12, and the connecting portion 13 is made of an insulating material. Preferably, the width of the connecting part 13 is 5-7 mm, the thickness is 1.5-2 mm, and the material of the connecting part 13 is thermoplastic polyurethane polymer insulating material. As shown in fig. 1, the insulating layer 16 of the positive electrode lead 11, the insulating layer 18 of the negative electrode lead 12, and the connecting portion 13 are preferably integrally formed.
Fig. 3 shows a schematic cross-sectional view of a signal line according to an embodiment of the invention. As shown in the drawings, the fuse wire groove 14 in the signal line 10 is configured in a shape of a combination of a bell mouth and a three-quarter circle, so as to ensure that the fuse wire 30 is easily put into the fuse wire groove 14 along the direction of the notch, and is blocked after being put into the fuse wire groove, so that the fuse wire is not easily dropped out. And the fuse wire 30 is set to be in a loose state in the fuse wire groove 14, so as to prevent the fuse wire 30 from being pulled apart due to stress when the cable is bent, thereby causing wrong alarm information. It will be understood by those skilled in the art that the shape of the fuse wire groove is not limited thereto, and any fuse wire groove shape that meets the above requirements may be included within the scope of the present invention.
It is also preferred that the fuse 30 be secured in the fuse slot 14 by closing the opening (flare as described above) of the fuse slot 14 with molten plastic insulating material after the fuse 30 is placed in the fuse slot 14.
As shown in fig. 1, a plurality of placing grooves 50 are provided at intervals on the connecting portion 13, and each of the temperature sensing units 20 is provided in one of the placing grooves 50. The placement groove 50 may be a hollowed-out portion of the connection portion 30. According to a preferred embodiment of the invention, said placement grooves 50 have a cross section of 1.5mmx6mm and are produced by a punching process. As described above, after the fuse 30 is placed in the fuse slot 14, the fuse 30 may be enclosed in the fuse slot 14 by the molten plastic insulating material. It is further preferable that the connecting portion 13 has one or more notch portions 60 (i.e., an opening portion on a closed portion formed of a plastic insulating material) between two adjacent temperature sensing units 20 to expose the fusible link 30, and the exposed fusible link 30 is disposed to be closely attached to the cable sheath 40 when the cable sheath 40 is enclosed, and the fusible link 30 can more timely follow the change of the external environment temperature due to the fact that only one layer of the wrapping material is provided across the cable sheath 40. The one or more notch portions 60 are exposed points of the fusible link 30, which are temperature detecting points of the temperature sensing cable 100. In this way, the fusible link 30 can more accurately detect a slight change in the ambient temperature.
Fig. 4 illustrates a connection diagram of a temperature sensing unit and a fuse according to an embodiment of the present invention. As shown in the figure, the temperature sensing unit 20 includes a thermistor 21, a circuit board 22 and a control chip 23 mounted on the circuit board 22, wherein the circuit parameter of the thermistor 21 can be changed according to the change of temperature, the temperature information at the temperature sensing unit 20 is monitored in real time, the control chip 23 is connected to the thermistor 21 and can determine the temperature information according to the circuit parameter of the thermistor 21, and the control chip 23 is coupled to the signal line 10 and is 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 thermistor 21 exceeds a temperature threshold or the temperature rises too fast, and send an alarm signal through the signal line 10.
According to an embodiment of the present invention, as shown in fig. 4, a first land 24 and a second land 25 are provided on the circuit board 22, the positive lead 11 is connected to the circuit board 22 at the first land 24 through the positive conductor 15, the negative lead 12 is connected to the circuit board 22 at the second land 25 through the negative conductor 17 (as shown in fig. 1), and the first land 24 and the second land 25 are designed as two half-metallized holes in parallel, so as to facilitate reliable welding of the positive and negative leads together. According to an embodiment of the present invention, the temperature sensing unit 20 further includes two connection boards 28, and the circuit board 22 is further provided with a third pad 26 and a fourth pad 27, wherein one ends of the two connection boards 28 are electrically connected to the circuit board 22 through the third pad 26 and the fourth pad 27, respectively, so that the fusible link 30 can be connected to the circuit board 22 through the connection boards 28. Preferably, the connection board 28 is a flexible PCB.
In addition, according to an embodiment of the present invention, the signal line 10 may be used not only to transmit signal data, but also to supply power to the temperature sensing unit 20. As shown in fig. 4, the temperature sensing unit 20 is electrically connected to the positive lead 11 and the negative lead 12 through the first pad 24 and the second pad 25, and not only can be used for transmitting signals (for example, between the chip 23 and the outside), but also can be used for supplying power to various devices (for example, the control chip 23) on the temperature sensing unit 20, which is not described herein again.
Compared with the existing signal line, the signal line 10 shown in fig. 2 integrates the positive lead 11 and the negative lead 12, and when being installed, especially when being used for the temperature sensing cable 100, the relative positions of the positive lead 11 and the negative lead 12 are not easily distorted or changed during the deployment process. 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 connection 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 electronic components are better protected by the insulating layer from being damaged by extrusion; the integral signal wire 10 can also make the exposed point of the fusible link of the notch part 60 arranged on the connecting part 13 more consistent in response to the temperature according to the comparison rule of the appearance and the size of the temperature sensing cable, namely, the consistency of all the detection points of the whole wire in response to the ambient temperature is ensured. When the integrated signal wire 10 is pulled by external force, the positive lead 11 and the negative lead 12 are stressed uniformly, so that the welding spot welded on the signal wire 10 is not strained, and the reliability of the product is ensured.
According to an embodiment of the present invention, the temperature sensing unit 20 is configured to sense the fusing of a fuse 30 connected thereto, and when the fuse 30 is fused, the temperature sensing unit 20 (chip 23) is configured to send a disconnection signal through the signal line 10, wherein the signal line 10 is the positive lead 11 and the negative lead 12. According to one embodiment of the present invention, the temperature sensing unit 20 and the temperature sensing unit 20 adjacent thereto form a passage in which the fuse wire 30 is located. When the fuse 30 between the two is not blown, there is a weak current flow in the path; when the fuse 30 between the two is fused, the path becomes open circuit, and the temperature sensing unit 20 is configured to transmit an open circuit signal through the signal line 10 when the current is not detected.
According to a preferred embodiment of the present invention, the thermistor 21 in the temperature-sensitive cable 100 is configured as a ntc thermistor, the ntc thermistor is closely attached to the cable sheath 40, and the distance between adjacent temperature-sensitive control units 20 is 90-100 cm, so as to accurately position the ignition point within one meter.
The present invention also relates to a temperature sensitive fire detection system, as shown in fig. 5, which is a schematic view of a temperature sensitive fire detection system according to an embodiment of the present invention. As shown in the drawing, the temperature-sensitive fire detection system 500 includes one or more 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 configured to receive the data transmitted by the temperature sensing unit 20 in the temperature sensing cable 100, perform querying, analyzing 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 of the temperature sensing cables 100. According to a preferred embodiment of the present invention, the signal processing unit 200 further comprises an indicator light, a nixie tube and a plurality of ports (not shown in the figure), and the technical parameters thereof are as follows: rated voltage is DC24V, and the working range is DC 20V-DC 28V; the power under the normal condition 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 (red), fault (yellow), run (green); the plurality of ports respectively include 1 RS485(MODBUS agreement) port, 1 CAN port, 3 passive dry contact output ports (fire alarm, trouble, auxiliary control), 1 fire control return circuit port and 1 temperature sensing cable passageway port.
According to an embodiment of the present invention, as shown in fig. 5, the temperature-sensitive fire detection system 500 further includes a terminal box 300, the terminal box 300 is coupled to the second end of the temperature-sensitive cable 100, seals the second end of the temperature-sensitive cable 100, and is configured to monitor a communication state of the temperature-sensitive cable 100 between the signal processing unit 200 and the terminal box 300 and timely feed back whether there is a broken short circuit message in the cable. According to an embodiment of the present invention, the terminal box 300 is a closed device, the wire inlet has a soft glue sealing waterproof device, which can meet the protection level of IP66, 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, material is flame retardant ABS plastic, and the protection grade of the shell is IP 67.
According to an embodiment of the present invention, each temperature sensing unit 20 in the temperature sensing cable 100 has a unique number ID or address number. When the temperature sensing unit 20 sends temperature information, open circuit information or alarm signal through the signal line 10, the data will have its 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 and/or disconnection 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. According to the attached unique number ID or unique address number, the specific position of the temperature sensing unit 20 where the corresponding event occurs can be known, so as to accurately locate the ignition point or the disconnection point.
According to an embodiment of the present 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 sent by one of the temperature sensing units 20 is higher than a first alarm temperature threshold, a fire alarm is triggered; and/or when the data sent by one of the temperature sensing units 20 shows that the temperature thereof rises above the second alarm temperature threshold value within a certain time (i.e. the temperature rises too fast), triggering a fire alarm. 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 zone various alarm temperatures.
Fig. 6 shows three application modes of the temperature-sensitive fire detection system according to one embodiment of the present invention. As shown in the figure, 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, so that the temperature sensing cable 100 and the terminal box 300 are simultaneously placed in a detection area, the temperature in the detection area is sensed, and a fire is monitored. In this mode, the length of the sensing area, which is the farthest sensing area, i.e., 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 of 1.5mm square, and the other end is coupled to the terminal box 300, so that the temperature sensing cable 100 and the terminal box 300 are simultaneously placed in a detection area, the temperature in the detection area is sensed, and a fire is monitored. In this mode, the detection of the farther detection zone can be achieved by adjusting the length of the ordinary twisted pair cable. In the third application mode, the connection of the temperature sensing cable 100 is the same as that in the first application mode, but the temperature sensing cable 100 and the terminal box 300 are respectively distributed in four detection regions with different temperatures, i.e., a detection region 1, a detection region 2, a detection region 3, and a detection region 4. In this mode, the temperature-sensitive fire detection system 500 may sense and alarm the temperature of different detection areas independently. The second application mode and the third application mode both make the application range of the temperature-sensitive fire detection system 500 wider, and the application scenarios are more diverse. It will be understood by those skilled in the art that the application range 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. 7 shows a schematic diagram of a fire alerting system according to one embodiment of the present invention. As shown, the fire alarm system 700 includes the temperature-sensitive fire detection system 500, a fire alarm controller 710, a communication line 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, the fire alarm controller 710 controls the actuation and opening of fire alarm actuators (not shown), such as an alarm bell, a fire sprinkler, a fire door, etc., according to the temperature information and/or disconnection information transmitted from the signal processing unit 200, and the other devices 730 receive the information of the signal processing unit 200 and act 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 present invention also relates to a method for temperature detection using the above temperature-sensitive fire detection system 500.
The embodiment of the invention overcomes the functional defects of the traditional cable type linear temperature-sensing detector and the defects of high cost and poor positioning precision of an optical fiber cable by providing the temperature-sensing cable and the temperature-sensing fire detection system comprising the same, can accurately position the range of a fire point, has long detection distance and high detection precision, and can display the detection temperature in real time. Compared with the traditional optical fiber cable, the optical fiber cable has the advantages of being not subjected to strong light source attenuation, external stress influence, 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: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (22)
1. A temperature-sensitive cable, comprising:
the signal wire comprises a positive wire and a negative wire, and the positive wire and the negative wire are arranged in parallel;
a plurality of temperature sensing units disposed between the positive electrode lead and the negative electrode lead at intervals along the signal line, the temperature sensing units being configured to sense an ambient temperature and coupled to the signal line; and
and the adjacent temperature sensing units are connected by the fuse wire.
2. The temperature-sensitive cable according to claim 1, further comprising a cable sheath that encases the signal wire, the temperature-sensitive unit, and the fusible link therein.
3. The temperature-sensitive cable according to claim 1 or 2, wherein the signal line further includes a connecting portion, the positive wire includes a positive conductor and an insulating layer, the insulating layer covers the positive conductor, the negative wire includes a negative conductor and an insulating layer, the insulating layer covers the negative conductor, the positive conductor extends inside the positive wire, the negative conductor extends inside the negative wire, and the connecting portion is provided between the positive wire and the negative wire to connect the positive wire and the negative wire together.
4. The temperature-sensitive cable according to claim 3, wherein the connection portion has a flat structure, and the connection portion is made of an insulating material.
5. The temperature-sensitive cable according to claim 4, wherein a fuse groove is provided on the connection part, the fuse being disposed in the fuse groove.
6. The temperature-sensitive cable according to claim 4, wherein the connection part is further provided with a plurality of placement grooves spaced apart from each other, and each of the temperature-sensitive units is disposed in one of the placement grooves.
7. The temperature-sensitive cable according to claim 4, wherein the connection part has one or more notch portions between the two temperature-sensitive cells to expose the fusible links.
8. The temperature-sensitive cable according to claim 5, wherein a cross-section of the fuse wire groove is configured in a shape of a bell mouth combined with a three-quarter circle.
9. The temperature-sensitive cable according to claim 5, wherein the fuse is set in a relaxed state within the fuse groove.
10. The temperature sensing cable according to claim 1 or 2, wherein the temperature sensing unit includes a thermistor whose circuit parameter is variable according to a change in temperature, a circuit board, and a control chip mounted on the circuit board, the control chip being connected to the thermistor and determining temperature information according to the circuit parameter of the thermistor, the control chip being coupled to the signal line and configured to transmit the temperature information through the signal line.
11. The temperature sensing cable according to claim 1 or 2, wherein the temperature sensing unit is configured to be able to obtain electric power through the signal line.
12. A temperature-sensitive cable according to claim 1 or 2, wherein the temperature-sensitive unit is arranged to sense the melting of a fuse associated therewith, the temperature-sensitive unit being arranged to send a trip signal via the signal line when the fuse melts.
13. The temperature-sensitive cable according to claim 12, wherein the temperature-sensitive cell and the temperature-sensitive cell adjacent thereto form a path in which a weak current passes when a fuse between the two is not fused; the circuit becomes an open circuit when a fuse between the two is blown, the open circuit having no current therein, the temperature sensing unit being configured to send an open circuit signal through the signal line when the current is not detected.
14. The temperature-sensitive cable according to claim 10, wherein the circuit board is provided with a first land and a second land, the positive electrode lead is connected to the circuit board through the first land, and the negative electrode lead is connected to the circuit board through the second land.
15. The temperature sensing cable according to claim 10, wherein the thermistor is a ntc thermistor, the ntc thermistor is closely attached to the cable sheath, and a distance between adjacent temperature sensing control units is 90 to 100 cm.
16. A temperature sensitive fire detection system comprising:
the temperature sensitive cable according to any one of claims 1 to 15;
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.
17. The temperature sensitive fire detection system of claim 16 further comprising a terminal closure coupled to the second end of the temperature sensitive cable to seal the second end of the temperature sensitive cable.
18. The temperature sensitive fire detection system of claim 16 or 17, wherein the signal processing unit receives temperature data and/or trip data from the temperature sensing unit.
19. The temperature sensitive fire detection system according to claim 16 or 17, wherein each of the temperature sensing units has a unique address number, the unique address number being included in data transmitted by the temperature sensing units through the signal lines.
20. The temperature-sensitive fire detection system of claim 16 or 17, wherein the signal processing unit is configured to:
when the temperature sent by one temperature sensing unit is higher than a first alarm temperature threshold value, triggering fire alarm; and/or
And when the temperature of one temperature sensing unit is higher than a second alarm temperature threshold value within a certain time, the fire alarm is triggered.
21. The temperature sensitive fire detection system of claim 20 wherein the first alarm temperature threshold is 60-85 ℃, preferably 85 ℃.
22. A method of temperature detection using the temperature sensitive fire detection system of any one of claims 16-21.
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| CN111696302B (en) | 2024-02-02 |
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