CN115131936A - Temperature sensing cable and fire alarm system - Google Patents
Temperature sensing cable and fire alarm system Download PDFInfo
- Publication number
- CN115131936A CN115131936A CN202210946288.6A CN202210946288A CN115131936A CN 115131936 A CN115131936 A CN 115131936A CN 202210946288 A CN202210946288 A CN 202210946288A CN 115131936 A CN115131936 A CN 115131936A
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- China
- Prior art keywords
- temperature
- temperature sensing
- sensing unit
- low
- melting
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention provides a temperature sensing cable and a fire alarm system. The temperature sensing cable comprises two wires; the temperature sensing unit is arranged between the two leads and is electrically connected with the leads; the low-melting-point conductive material is electrically connected with the temperature sensing unit; the temperature sensing unit detects the on-off state of the low-melting-point conductive material connected with the temperature sensing unit and is configured to send out an alarm signal after the low-melting-point conductive material is disconnected. The fire alarm system comprises the temperature sensing cable; and the signal processing unit is electrically connected to one end of the temperature sensing cable and is configured to send out a fire alarm according to the signal of the temperature sensing unit on the temperature sensing cable. Through setting up temperature sensing unit and low melting point conducting material, can pinpoint the ignition point, do benefit to and put out the fire in the initial stage that the conflagration takes place, protection people's life and property safety.
Description
Technical Field
The invention relates to the technical field of fire-fighting equipment, in particular to a temperature sensing cable and a fire alarm system.
Background
A temperature sensing cable, also called a line type temperature sensing fire detector, is a fire detector that responds to the ambient temperature of a continuous line.
Fig. 1 shows a conventional temperature sensing cable, which includes a signal detector 210, a terminal connector 220, and two elastic conductors 230, wherein the two elastic conductors 230 are twisted with each other and connected between the signal detector 210 and the terminal connector 220, and a fusible insulation layer is further wrapped around the elastic conductors 230. When a fire disaster occurs in the temperature sensing cable, the meltable insulation layer outside the elastic conductors 230 is heated and melted, the two elastic conductors 230 approach each other under the action of the twisting force and are in contact with each other to form a short circuit, and the signal detector 210 receives the short circuit signal and sends out fire alarm information. Although the temperature sensing cable can detect whether a fire occurs or not, the temperature sensing cable cannot be used for accurately positioning the fire point when the fire occurs.
The statements in the background section are merely prior art as they are known to the inventors and do not, of course, represent prior art in the field.
Disclosure of Invention
The invention provides a temperature sensing cable and a fire alarm system, which aim to solve the problem that the temperature sensing cable in the prior art cannot accurately position an ignition point.
A temperature-sensitive cable, comprising:
two wires are arranged;
the temperature sensing unit is arranged between the two leads and is electrically connected with the leads; and
the low-melting-point conductive material is electrically connected with the temperature sensing unit;
the temperature sensing unit detects the on-off state of the low-melting-point conductive material connected with the temperature sensing unit and is configured to send out an alarm signal after the low-melting-point conductive material is disconnected.
According to one aspect of the invention, the two wires are substantially parallel, the temperature sensing cable comprises a plurality of temperature sensing units which are arranged at intervals along the length direction of the wires, and the low-melting-point conductive material is connected between adjacent temperature sensing units.
According to one aspect of the invention, an insulating component is arranged outside the temperature sensing unit; the insulation assembly comprises an insulator and an insulation protection layer; the insulator is provided with an object placing hole, and the temperature sensing unit is arranged in the object placing hole; the insulating protective layer is arranged outside the insulator and at least covers the object placing hole.
According to one aspect of the invention, the insulator is provided with a threading hole communicated with the object placing hole, and the low-melting-point conductive material is threaded through the threading hole.
According to an aspect of the present invention, the insulator includes two insulating blocks with a space provided therebetween, and the wire is exposed at the space and electrically connected to the temperature sensing unit.
According to one aspect of the invention, one end of the insulating block is provided with a notch; the two insulating blocks are symmetrically arranged, and the object placing holes are formed by notches in the two insulating blocks.
According to one aspect of the invention, the insulating protection layer is a non-hydrophilic polymer insulating sleeve.
According to an aspect of the present invention, the temperature sensing unit includes a temperature sensor having a chip and a negative temperature coefficient thermistor;
when the resistance value of the negative temperature coefficient thermistor is lower than a preset value, the temperature sensor sends out an alarm signal; or when the variation difference of the resistance value of the negative temperature coefficient thermistor is larger than a preset value within a preset time, the temperature sensor sends out an alarm signal.
According to one aspect of the present invention, the low melting point conductive material is a low melting point metal wire or a low melting point conductive fiber.
The present invention also provides a fire alarm system, comprising:
the temperature sensing cable described above;
and the signal processing unit is electrically connected to one end of the temperature sensing cable and is configured to send out a fire alarm according to the signal of the temperature sensing unit on the temperature sensing cable.
According to one aspect of the invention, the signal processing unit is configured to determine the location of the fire.
Compared with the prior art, the embodiment of the invention provides the temperature sensing cable and the fire alarm system, when the low-melting-point conductive material is heated and fused, the temperature sensing units connected with the temperature sensing cable can timely detect the condition and send alarm signals outwards, and the ignition point can be accurately positioned according to the alarm signals sent by which temperature sensing unit is analyzed. The temperature sensing unit can be protected by arranging the insulator and the insulating protective layer, the temperature sensing unit is prevented from being damaged by mechanical pressure, and the temperature sensing unit is prevented from being corroded by external water, moisture, dust and the like.
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 illustrates a temperature sensitive cable of the prior art;
FIG. 2 illustrates a temperature sensitive cable according to one embodiment of the present invention;
FIG. 3 illustrates a temperature sensing unit and an insulation assembly according to one embodiment of the present invention;
fig. 4 shows an insulator according to an embodiment of the invention.
In the figure: 100. a temperature-sensitive cable; 110. a temperature sensing unit; 111. a temperature-sensitive sensor; 120. a low melting point conductive material; 130. an insulating assembly; 131. an insulator; 1311. an insulating block; 1312. a notch; 1313. threading holes; 1314. a through hole; 132. an insulating protective layer; 1321. a non-hydrophilic polymer insulating sleeve; 133. placing an object hole; 140. a wire; 210. a signal detector; 220. a terminal connection member; 230. an elastic conductor.
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" and "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; they may be directly connected or indirectly connected through intervening media, or may be connected through the use of two elements or the interaction of two elements. 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 preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Fig. 2 shows a temperature sensitive cable 100 according to an embodiment of the present invention, which will be described in detail with reference to fig. 2.
As shown in fig. 2, the temperature-sensitive cable 100 includes a conductive wire 140, a temperature-sensitive unit 110, and a low-melting point conductive material 120. The number of the wires 140 is two, the two wires 140 are substantially parallel, and the wires 140 may include a metal wire and an insulating material wrapped outside the metal wire. The temperature sensing unit 110 is disposed between two wires 140 and electrically connected to the wires 140, and the two wires 140 supply power to the temperature sensing unit 110 and serve as a carrier for signal transmission. The temperature sensing units 110 may be disposed in a plurality of numbers, the plurality of temperature sensing units 110 are disposed at intervals along the length direction of the wire 140, the adjacent temperature sensing units 110 are electrically connected to the low melting point conductive material 120, the low melting point conductive material 120 may be at least a low melting point metal wire, the low melting point metal wire may be, for example, a tin-zinc alloy wire, a lead-antimony alloy wire, or the like, and the melting point of the low melting point metal wire may be 150-. In other embodiments, the low-melting point conductive material 120 may also be at least low-melting point conductive fibers. When the temperature sensing cable 100 is in a closed state, the conductive material 120 with a low melting point is heated to melt and break the conductive material 120 with a low melting point.
The temperature sensing unit 110 is configured to detect the on/off state of the low melting point conductive material 120 connected thereto, and to send an alarm signal when detecting the off state of the low melting point conductive material 120. For example, the temperature sensing unit 110 may include a current sensor or a voltage sensor, and the on/off state of the low melting point conductive material 120 is determined by detecting the current or voltage of the low melting point conductive material 120. When a fire breaks out near the temperature sensing cable 100, the low melting point conductive material 120 close to the fire point is heated and disconnected, and the temperature sensing unit 110 connected with the low melting point conductive material 120 can timely detect the situation and send an alarm signal to the outside, wherein the alarm signal can contain the position information of the temperature sensing unit 110, and the fire point can be accurately positioned by analyzing the alarm signal.
The distance between adjacent temperature sensing units 110 may be set as desired, and may be, for example, 0.5 m or 1 m. The distance between the adjacent temperature sensing units 110 is related to the accuracy of locating a fire, and the smaller the distance between the adjacent temperature sensing units 110 is, the higher the accuracy of locating a fire when a fire occurs near the temperature sensing cable 100.
Fig. 3 illustrates a temperature sensing unit 110 and an insulation assembly 130 according to one embodiment of the present invention. As shown in fig. 2 and 3, the temperature sensing unit 110 may further include a temperature sensing sensor 111 having a chip and a negative temperature thermistor. The temperature sensor 111 can sense the change of the ambient temperature nearby, and when the change of the ambient temperature reaches a set alarm threshold value, the temperature sensor 111 sends out an alarm signal.
Specifically, the resistance value of the ntc thermistor in the temperature sensor 111 gradually decreases with the increase of the temperature, so that the alarm threshold value of the temperature sensor 111 can be set to a fixed value, that is, when the resistance value of the ntc thermistor is lower than a preset value, the temperature sensor 111 sends an alarm signal; the alarm threshold of the temperature sensor 111 may also be set to a difference value, that is, when the difference value of the resistance value change of the negative temperature coefficient thermistor is greater than the preset difference value within the preset time, the temperature sensor 111 sends an alarm signal.
According to an embodiment of the present invention, as shown in fig. 3 and 4, an insulation member 130 is provided outside the temperature sensing unit 110, and the insulation member 130 may be flat to facilitate coiling of the temperature sensing cable 100. The insulation assembly 130 includes an insulator 131 and an insulation protection layer 132, wherein the insulator 131 is provided with an object placing hole 133, the temperature sensing unit 110 is disposed in the object placing hole 133, and the insulation protection layer 132 is disposed outside the insulator 131 and at least covers the object placing hole 133 to protect the temperature sensing unit 110, prevent the temperature sensing unit 110 from being damaged by mechanical pressure, and prevent external water, moisture, dust, and the like from entering.
According to an embodiment of the present invention, as shown in fig. 3, the insulator 131 includes two insulating blocks 1311, a notch 1312 is formed at one end of the insulating block 1311, and the two insulating blocks 1311 are symmetrically disposed, so that the notches 1312 formed in the two insulating blocks 1311 constitute the object placing hole 133. A wire hole 1313 is further formed at the other end of the insulating block 1311, the wire hole 1313 communicates with the gap 1312, the cross section of the wire hole 1313 may be waist-shaped, and the low melting point conductive material 120 penetrates the insulating block 1311 through the wire hole 1313 and is electrically connected to the temperature sensing unit 110. The insulating block 1311 is provided with two through holes 1314, the two through holes 1314 are respectively located at two sides of the notch 1312 and penetrate through two ends of the insulating block 1311, the two wires 140 correspond to the two through holes 1314 one by one, the two wires 140 penetrate through the insulating block 1311 through the corresponding through holes 1314 respectively, a certain interval is left between the two insulating blocks 1311, and the wires 140 are exposed at the interval and electrically connected with the temperature sensing unit 110, which specifically may be: conductor blocks are provided at both sides of the temperature sensing unit 110, and the conductor blocks extend into the space and are welded with the metal wires of the corresponding lead wires 140.
The insulation block 1311 may be directly injection-molded on the conductive wire 140, so that a strong bonding force is formed between the insulation block 1311 and the conductive wire 140, and the insulation block 1311 and the conductive wire 140 are not easily separated by an external force. In other embodiments, the insulation block 1311 may be formed and then fixed to the wire 140, for example, the insulation block 1311 is bonded to the wire 140.
According to an embodiment of the present invention, as shown in fig. 3 and 4, the insulation protection layer 132 may be a non-hydrophilic polymer insulation sleeve 1321, and the non-hydrophilic polymer insulation sleeve 1321 is sleeved outside the two insulation blocks 1311 and covers the gaps 1312 on the two insulation blocks 1311. The non-hydrophilic polymer insulating cover 1321 may be adhered to the insulating block 1311, or may be connected to the insulating block 1311 by interference fit, so that the non-hydrophilic polymer insulating cover 1321 is tightly fitted to the insulating block 1311, and external water, moisture, dust, and the like are prevented from entering the accommodating hole 133.
The present invention also provides a fire alarm system, comprising a signal processing unit and the temperature sensing cable 100 as described above, wherein the signal processing unit is electrically connected to one end of the temperature sensing cable 100 (for example, electrically connected to two wires 140 of the temperature sensing cable 100), and the signal processing unit is configured to issue a fire alarm according to a signal (for example, the alarm signal) issued by the temperature sensing unit 110 on the temperature sensing cable 100. The signal processing unit may be further configured to determine the location of a fire based on a signal from the temperature sensing unit 110 on the temperature sensing cable 100.
Compared with the prior art, the temperature sensing cable 100 and the fire alarm system provided by the embodiment of the invention can alarm when the low-melting-point conductive material 120 is disconnected, and can also alarm when the environmental temperature changes to reach the set alarm threshold value, so that the fire detection is more sensitive, the fire point can be accurately positioned, the fire can be extinguished at the initial stage of the fire, and the life and property safety of people can be protected.
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 modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. 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 (11)
1. A temperature-sensitive cable, comprising:
two wires are arranged;
the temperature sensing unit is arranged between the two leads and is electrically connected with the leads; and
the low-melting-point conductive material is electrically connected with the temperature sensing unit;
the temperature sensing unit detects the on-off state of the low-melting-point conductive material connected with the temperature sensing unit and is configured to send out an alarm signal after the low-melting-point conductive material is disconnected.
2. The temperature-sensing cable according to claim 1, wherein the two wires are substantially parallel, the temperature-sensing cable includes a plurality of temperature-sensing units spaced apart along a length direction of the wires, and the low-melting-point conductive material is connected between adjacent ones of the temperature-sensing units.
3. The temperature-sensing cable according to claim 1, wherein an insulating member is provided outside the temperature-sensing unit; the insulation assembly comprises an insulator and an insulation protection layer; the insulator is provided with an object placing hole, and the temperature sensing unit is arranged in the object placing hole; the insulating protective layer is arranged outside the insulator and at least covers the object placing hole.
4. The temperature-sensitive cable according to claim 3, wherein the insulator is provided with a threading hole communicating with the storage hole, and the low-melting-point conductive material is threaded through the threading hole.
5. The temperature-sensitive cable according to claim 3 or 4, wherein the insulator includes two insulating blocks with a space provided therebetween, and the conductive wire is exposed at the space and electrically connected to the temperature-sensitive unit.
6. The temperature-sensitive cable according to claim 5, wherein a notch is provided at one end of the insulating block; the two insulating blocks are symmetrically arranged, and the object placing holes are formed by notches in the two insulating blocks.
7. The temperature-sensitive cable according to claim 3, wherein the insulation protective layer is a non-hydrophilic polymer insulation sheath.
8. The temperature-sensing cable according to claim 1, wherein the temperature-sensing unit includes a temperature sensor having a chip and a negative temperature coefficient thermistor;
when the resistance value of the negative temperature coefficient thermistor is lower than a preset value, the temperature sensor sends an alarm signal; or when the variation difference of the resistance value of the negative temperature coefficient thermistor is larger than a preset value within a preset time, the temperature sensor sends out an alarm signal.
9. The temperature-sensitive cable according to claim 1, wherein the low-melting-point conductive material is a low-melting-point metal wire or a low-melting-point conductive fiber.
10. A fire alerting system, comprising:
the temperature sensitive cable of any one of claims 1-9;
and the signal processing unit is electrically connected to one end of the temperature sensing cable and is configured to send out a fire alarm according to the signal of the temperature sensing unit on the temperature sensing cable.
11. A fire alerting system as claimed in claim 1, wherein the signal processing unit is configured to determine the location of a fire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210946288.6A CN115131936A (en) | 2022-08-08 | 2022-08-08 | Temperature sensing cable and fire alarm system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210946288.6A CN115131936A (en) | 2022-08-08 | 2022-08-08 | Temperature sensing cable and fire alarm system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115131936A true CN115131936A (en) | 2022-09-30 |
Family
ID=83385745
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210946288.6A Pending CN115131936A (en) | 2022-08-08 | 2022-08-08 | Temperature sensing cable and fire alarm system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115131936A (en) |
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2022
- 2022-08-08 CN CN202210946288.6A patent/CN115131936A/en active Pending
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