CN101021963A - Linear temperature-sensing fire detector - Google Patents
Linear temperature-sensing fire detector Download PDFInfo
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- CN101021963A CN101021963A CN 200710056928 CN200710056928A CN101021963A CN 101021963 A CN101021963 A CN 101021963A CN 200710056928 CN200710056928 CN 200710056928 CN 200710056928 A CN200710056928 A CN 200710056928A CN 101021963 A CN101021963 A CN 101021963A
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Abstract
This invention discloses a linetype temperature-sensing fire detector composed of a linetype temperature-sensing element and a converting box connected to one end of the element, in which, the element includes two parallel set detection conductors, a meltable salt material layer and a NTC property blocking layer set parallel between the detection conductors, when fire happens, the temperature of a heated part of the element will surpass the melt temperature of the meltable salt so that the conduction performance of which will be changed, and the electric parameter of the element is decided by the resistance of the NTC property blocking layer in the heated region so as to increase the available length of the element, and when the element is installed in a humid place, once moisture outside enters into it, the meltable salt will be solved, yet the NTC blocking layer is still set between the detection conductors, error warning will not happen.
Description
Technical field
The present invention relates to a kind of line-type heat detector, particularly relate to a kind of can be waterproof and dampproof, and can prolong the line-type heat detector that uses length.
Background technology
Line-type heat detector commonly used at present is a kind of broad-spectrum fire detector, mainly by linear temperature sensor and be connected an end of linear temperature sensor, can be in real time the temperature or the warning electrical quantity (or sampled value) of linear temperature sensor be detected, and form according to the boxcar that the size of temperature or warning electrical quantity (or sampled value) is sent fire alarm signal.United States Patent (USP) the 5th, 793 discloses a kind of line-type heat detector in No. 293.Fig. 1 is a linear temperature sensor transverse sectional view in this line-type heat detector.As shown in Figure 1, this linear temperature sensor is to be reached to walk abreast by two parallel detecting conductors that are provided with 1,2 to be arranged on detecting conductor 1, but the fused salt between 2 (eutectic salts) material layer 3 is formed; Wherein fusible salt material layer 3 is but that glass fibre or plastic optical fibre are immersed in the fused salt of fusing, but the fiber that will soak fused salt then twines or is wrapped in the outside of detecting conductor and makes.But the fusing point of fused salt is 60～300 ℃, and after the fusing, its electric conductivity strengthens, and promptly resistance reduces, and after solidifying, its electric conductivity reduces, and promptly resistance increases.When breaking out of fire, the linear temperature sensor that is positioned at the scene of fire in this detector will raise because of the temperature of being heated, but fused salt states of matter in the fusible salt material layer 3 of inside, heated part or electric conductivity will be subjected to the influence of temperature rising and change at this moment, thereby the electrical quantity of linear temperature sensor is also changed thereupon, at this moment, the boxcar that is connected linear temperature sensor one end will detect this variation immediately, in case but the temperature of this heated part surpasses the temperature of fusion of fused salt, boxcar sends fire alarm signal immediately, thereby reaches the purpose of fire alarm.But, there is following point in the line-type heat detector of this prior art: but owing to the fused salt chance water of linear temperature sensor inside in this detector can produce dissolving, thereby it is very responsive to wet environment, therefore, in case its fully or the part be in the wet environment, outside moisture will penetrate into the fusible salt material layer 3 of linear temperature sensor inside, thereby its electric conductivity is increased, the boxcar that be connected linear temperature sensor one end this moment just can detect this variation immediately, therefore might cause occurring false alarm.
Linear temperature sensor in the another kind of commonly used line-type heat detector is by two parallel detecting conductors that are provided with and parallelly be arranged on two NTC characteristic barrier layers between the detecting conductor and form.When breaking out of fire, the electrical quantity of the NTC characteristic barrier layer of inside, heated part will be subjected to this Temperature Influence and change on the linear temperature sensor, thereby the electrical quantity of linear temperature sensor is also changed thereupon, at this moment, the boxcar that is connected linear temperature sensor one end will detect this variation immediately, and send fire alarm signal, thereby reach the purpose of fire alarm according to the electrical quantity size of linear temperature sensor.Though moist environment is little to the influence of this line-type heat detector, because the NTC characteristic barrier layer of linear temperature sensor inside is very responsive to temperature, so environment temperature is very big to its influence; In addition, along with the increase of using length, the resistance of NTC characteristic barrier layer can reduce, therefore when environment temperature is higher than a certain temperature, its electrical quantity just might surpass the constant temperature alarming threshold value of setting, will produce false alarm like this, therefore the use length of this linear temperature sensor will be restricted in actual applications.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of can be waterproof and dampproof, and can prolong the line-type heat detector that uses length.
In order to achieve the above object, line-type heat detector provided by the invention mainly is made up of linear temperature sensor and the boxcar that is connected linear temperature sensor one end; Wherein linear temperature sensor comprises two parallel detecting conductors that are provided with and parallel fusible salt material layer and the NTC characteristic barrier layer that is arranged between two detecting conductors.
At least one outside is coated with fusible salt material layer and NTC characteristic barrier layer successively in the described detecting conductor.
At least one outside is coated with NTC characteristic barrier layer and fusible salt material layer successively in the described detecting conductor.
An external packets in the described detecting conductor is covered with the NTC characteristic barrier layer, and another root external packets is covered with fusible salt material layer.
The external packets of described detecting conductor, fusible salt material layer and NTC characteristic barrier layer is covered with insulating sheath.
A detecting conductor in the described linear temperature sensor is a thermocouple wire.
Line-type heat detector provided by the invention is fusible salt material layer and NTC characteristic barrier layer are arranged between two detecting conductors and constitute linear temperature sensor, when breaking out of fire, but the temperature of linear temperature sensor heated part will surpass the temperature of fusion of fused salt, thereby but the electric conductivity of fused salt is changed, it is very little to be that resistance value becomes, this moment, the electrical quantity size of linear temperature sensor was mainly decided by the resistance of heat affected zone intersegmental part NTC characteristic barrier layer, and be subjected to the influence of other area segments linear temperature sensor very little, therefore can increase the use length of linear temperature sensor greatly.And be installed in wet environment following time when linear temperature sensor, in case outside moisture enters into the inside of linear temperature sensor, the fused salt of inside, position is met water and will be produced dissolving but this makes moist, it is the relative conducting in this position, but owing to also be provided with the NTC characteristic barrier layer between two detecting conductors, so just can therefore not cause false alarm, thereby can guarantee that line-type heat detector is working properly.
Description of drawings
Fig. 1 is a linear temperature sensor transverse sectional view in the line-type heat detector of prior art.
Fig. 2 is a line-type heat detector structural representation provided by the invention.
Fig. 3 is a linear temperature sensor transverse sectional view in the line-type heat detector provided by the invention.
Linear temperature sensor partial structurtes cut-open view in the line-type heat detector provided by the invention when Fig. 4 adopts coaxial manner to be provided with for detecting conductor.
Fig. 5 is the line-type heat detector equivalent circuit theory synoptic diagram shown in Fig. 2.
Embodiment
Below in conjunction with drawings and the specific embodiments line-type heat detector provided by the invention is elaborated.
Embodiment 1:
Fig. 2 is a line-type heat detector structural representation provided by the invention.Fig. 3 is a linear temperature sensor transverse sectional view in the line-type heat detector provided by the invention.As Fig. 2, shown in Figure 3, line-type heat detector provided by the invention mainly is made up of linear temperature sensor and the boxcar 19 that is connected linear temperature sensor one end; Wherein linear temperature sensor is made up of two parallel detecting conductors that are provided with 5,9 and parallel fusible salt material layer 6 and the NTC characteristic barrier layer 7 that is arranged between the detecting conductor 5,9.Be coated with fusible salt material layer 6 and NTC characteristic barrier layer 7 on the detecting conductor 5 successively, can certainly on detecting conductor 5, coat NTC characteristic barrier layer 7 and fusible salt material layer 6 successively, or fusible salt material layer 6 and NTC characteristic barrier layer 7 be coated on respectively on two detecting conductors 5,9.In addition, can be covered with insulating sheath in the external packets of linear temperature sensor, this insulating sheath not only can make linear temperature sensor and external insulation, but also can play waterproof and dampproof effect to fusible salt material layer 6.In addition, also can connect a terminal resistance 18 that works the supervision effect of opening circuit at the other end of linear temperature sensor.
Detecting conductor 5,9 can be hollow core conductor, solid conductor or metal fibre braided wire, and that parallel setting then comprises is parallel, winding and mode such as coaxial.When detecting conductor 5,9 adopted coaxial manners to be provided with, as shown in Figure 4, the seal boot of detecting conductor 5 for being made by aluminium foil added the isometric metallic conductor silk 20 of one and detecting conductor 5 within it on the periphery, be convenient to wiring like this.
Described NTC characteristic barrier layer 7 employed materials are selected from a kind of in polyacetylene, polyaniline, polythiophene, the poly-phthalein mountain valley with clumps of trees and bamboo, and its thickness range is 0.1～5mm, and the thickness range of fusible salt material layer 6 then is 0.05～10mm.
Fig. 5 is the line-type heat detector equivalent circuit theory synoptic diagram shown in Fig. 2.As shown in Figure 5, R1 ' is the equivalent resistance of the NTC characteristic barrier layer 7 of unit length heat affected zone (or the zone that makes moist), R1 is the not equivalent resistance of the NTC characteristic barrier layer 7 of heat affected zone (or the zone that do not make moist) of unit length, R2 ' is the equivalent resistance of the fusible salt material layer 6 of unit length heat affected zone (or the zone that makes moist), R2 then is the not equivalent resistance of the fusible salt material layer 6 of heat affected zone (or the zone that do not make moist) of unit length, and its principle of work is as follows:
1) under normal circumstances, this moment, but external temperature was lower than the temperature of fusion of fused salt, but the fused salt in the fusible salt material layer 6 of whole linear temperature sensor inside is fusing not, even the resistance of NTC characteristic barrier layer 7 can and use the increase of length to reduce with the environment temperature rising in the linear temperature sensor, but the resistance of fusible salt material layer 6 is still very big, so the boxcar 19 that is connected linear temperature sensor one end can not be subjected to the influence of environment temperature yet and big variation takes place its electrical quantity that detects (or sampled value) size, thus can eliminate only have the NTC characteristic barrier layer line-type heat detector because of variation of ambient temperature and use the long false alarm that causes of length.
2) when breaking out of fire, but the temperature of heated part will surpass the temperature of fusion of fused salt on the linear temperature sensor, at this moment but the electric conductivity of the fused salt of its inside can be undergone mutation, R2 ' resistance value that promptly should the zone will become very little (being equivalent to the conducting of heat affected zone section), this moment, the heat affected zone section just became the line-type heat detector of common NTC characteristic, the electrical quantity size of the linear temperature sensor that boxcar 19 detects is mainly by the resistance R 1 of heat affected zone intersegmental part NTC characteristic barrier layer 7 ' decide, and sends fire alarm signal when resistance R 1 ' above the constant temperature alarming threshold value.
3) be installed in wet environment following time when linear temperature sensor, this moment, environment temperature was lower than the constant temperature alarm temperature.In case outside moisture enters into the whole or local interior of linear temperature sensor, but meeting water, the fused salt in the fusible salt material layer 6 of the inside, position that makes moist to produce dissolving, resistance R 2 that promptly should the zone ' will become very little, but because environment temperature is low, so two detecting conductors 5, also be provided with NTC characteristic barrier layer 7 between 7, i.e. resistance R 1 ' still very big; The main resistance R 1 of electrical quantity size of the linear temperature sensor of boxcar 19 detections this moment ' decide by the regional intersegmental part NTC characteristic barrier layer 7 that makes moist, so just can therefore not cause false alarm, thereby can guarantee that line-type heat detector is working properly.
Embodiment 2:
Present embodiment is the improvement on embodiment 1 basis: one that is about in two detecting conductors 5,9 of above-mentioned linear temperature sensor is adopted thermocouple wire to make, thereby form a linear temperature sensor with thermocouple characteristic with another root detecting conductor, boxcar 19 will send fire alarm signal according to voltage (electromotive force) value of linear temperature sensor this moment.
Claims (6)
1, a kind of line-type heat detector mainly is made up of linear temperature sensor and the boxcar (19) that is connected linear temperature sensor one end; Wherein linear temperature sensor comprises two parallel detecting conductors (5 that are provided with, 9) and parallel be arranged on two detecting conductors (5,9) the fusible salt material layer (6) between, it is characterized in that: described linear temperature sensor also comprises a parallel NTC characteristic barrier layer (7) that is arranged between the detecting conductor (5,9).
2, line-type heat detector according to claim 1 is characterized in that: at least one outside is coated with fusible salt material layer (6) and NTC characteristic barrier layer (7) successively in the described detecting conductor (5,9).
3, line-type heat detector according to claim 1 is characterized in that: at least one outside is coated with NTC characteristic barrier layer (7) and fusible salt material layer (6) successively in the described detecting conductor (5,9).
4, line-type heat detector according to claim 1 is characterized in that: an external packets in the described detecting conductor (5,9) is covered with NTC characteristic barrier layer (7), and another root external packets is covered with fusible salt material layer (6).
5, according to claim 1,2,3 or 4 described line-type heat detectors, it is characterized in that: the external packets of described detecting conductor (5,9), fusible salt material layer (6) and NTC characteristic barrier layer (7) is covered with insulating sheath.
6, line-type heat detector according to claim 1 is characterized in that: a detecting conductor in the described linear temperature sensor is a thermocouple wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710056928 CN101021963A (en) | 2007-03-15 | 2007-03-15 | Linear temperature-sensing fire detector |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710056928 CN101021963A (en) | 2007-03-15 | 2007-03-15 | Linear temperature-sensing fire detector |
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| CN101021963A true CN101021963A (en) | 2007-08-22 |
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| CN 200710056928 Pending CN101021963A (en) | 2007-03-15 | 2007-03-15 | Linear temperature-sensing fire detector |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015135391A1 (en) * | 2014-03-10 | 2015-09-17 | 青岛中阳消防科技有限公司 | Passive temperature-sensitive sensing element |
| CN115457724A (en) * | 2022-11-04 | 2022-12-09 | 河北省金泰科技开发有限公司 | Indoor multifunctional disaster prevention early warning device |
-
2007
- 2007-03-15 CN CN 200710056928 patent/CN101021963A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015135391A1 (en) * | 2014-03-10 | 2015-09-17 | 青岛中阳消防科技有限公司 | Passive temperature-sensitive sensing element |
| CN115457724A (en) * | 2022-11-04 | 2022-12-09 | 河北省金泰科技开发有限公司 | Indoor multifunctional disaster prevention early warning device |
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Owner name: SHOU AN INDUSTRY FIRE LTD. Free format text: FORMER OWNER: ZHANG WEISHE; APPLICANT Effective date: 20080704 |
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Effective date of registration: 20080704 Address after: Beijing City, the Capital Airport South Industrial Zone Banbidian Road No. 22 Lee post encoding: 101304 Applicant after: Sureland Industry Fire-Fighting Co., Ltd. Address before: The construction of the road in the middle of Xiqing Yangliuqing town, Tianjin District 55 post encoding: 300380 Applicant before: Zhang Wei Co-applicant before: Li Gangjin |
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