CN101667318B - Linear heat fire detector and method for improving non-operating temperature rating - Google Patents
Linear heat fire detector and method for improving non-operating temperature rating Download PDFInfo
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- CN101667318B CN101667318B CN2009101807680A CN200910180768A CN101667318B CN 101667318 B CN101667318 B CN 101667318B CN 2009101807680 A CN2009101807680 A CN 2009101807680A CN 200910180768 A CN200910180768 A CN 200910180768A CN 101667318 B CN101667318 B CN 101667318B
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Abstract
The invention discloses a linear heat fire detector, comprising a converter box and a temperature-sensing cable which are mutually connected, as well as a temperature sensor arranged on the temperature-sensing cable and a signal processor arranged in the converter box, wherein, the temperature-sensing cable is provided with at least two wire cores which are mutually insulated, two pins of the temperature sensor are respectively connected with conductors of the different wire cores in the temperature-sensing cable, negative temperature coefficient heat-sensitive insulating materials are coated outside the wire cores, and the temperature sensor is used for detecting the environmental temperature and sending a detected environmental temperature signal to the signal processor; and the signal processor is used for monitoring the change situation of the insulation resistance between the wire cores of the temperature-sensing cable, judging whether a fire disaster occurs or not according to the environmental temperature signal, the change thereof and the change situation of the insulation resistance and emitting an alarm signal when the fire disaster occurs. The invention further discloses a method of improving the non-operating temperature rating for the linear heat fire detector.
Description
Technical field
The present invention relates to a kind of line-type heat detector alarm technique, specifically, relate to the be failure to actuate method of temperature grade of a kind of line-type heat detector and raising thereof.
Background technology
Cable linear temperature sensing fire detector is made up of sensitive element and coupled boxcar etc., generally also comprises a termination box.Cable linear temperature sensing fire detector is divided into renewable type and the big in twos class of beyond retrievable.The temperature sensing cable conductor of renewable type cable linear temperature sensing fire detector is copper wire normally, copper wire outside extrusion molding one deck temperature-sensitive negative temperature coefficient insulating material; The renewable type cable linear temperature sensing fire detector adopts analog quantity to survey the alarm principle that wire insulation resistance changes, and the sensitivity that large-range fire disaster is surveyed is than switching value beyond retrievable temperature sensing cable height.And the renewable type cable linear temperature sensing fire detector is reusable, need not after the warning to change, and after environment temperature was recovered normally, detector recovered former state of insulation automatically, need not manually-operated.The renewable type temperature sensing cable is very soft, and is convenient during installation, and anti-extrusion ability is also than switching value beyond retrievable temperature sensing cable height.
But because the employing of renewable type cable linear fire detector is that analog quantity is surveyed the alarm principle that the temperature sensing cable wire insulation resistance changes, be equivalent to online parallel connection numerous fixing " negative temperature coefficient heat-sensitive insulation resistance ", the variation of being somebody's turn to do " negative temperature coefficient heat-sensitive insulation resistance " is non-linear, and back in parallel resistance total value still is nonlinear.There is can not accurately being scheduled to of environment temperature in the practical application again, the length that each loop temperature sensing cable uses differs, the actual local temperature not first-class objective factor of length of temperature sensing cable of being heated that raises in the accident, people can not know accurately that reality experiences the quantity of fixing " the negative temperature coefficient heat-sensitive insulation resistance " of thermal change, even the temperature variation of each temperature-sensitive fixed insulation changes in resistance or impression also is unpredictable.That is to say, if environment bulk temperature height, can recover the cable linear detector completely between line insulation resistance value descend, total equivalent resistance declines to a great extent, this raises with line style explorer portion or local temperature sensing cable heating temperature and causes between line resistance to descend more greatly to be difficult to differentiation more greatly.They all will influence the variation of total insulation resistance, so the accuracy that influence is reported to the police.
Standard GB 16280-2005 " line-type heat detector " in Nikkei national standardization management committee approval issue September 1 in 2005, has replaced old standard GB16280-1996 comprehensively.On Dec 27th, 2006, the approval issue GB16280-2005 " line-type heat detector " of National Standards Commission national standard " No. 1 modification is single " was from enforcement on February 1 in 2007.The sensitive element of cable linear temperature sensing fire detector pattern check is the temperature sensing cable of standard length, be defined as sample sensitive element length and be not less than the maximal use length that manufacturer provides, and the sensitive element length of line style differential temperature, different constant temperature fire detector should be not less than 150 meters, and the sensitive element length of linetype temperature-fixing fire detecting device should be not less than 200 meters.Minimum warning length legislations is for being not more than 1 meter in the fire alarm action test.Experimental enviroment is to carry out under the status of criterion, and just test ambient temperature keeps stable.
The variation of new standard maximum is to have revised the humid test method of being failure to actuate, the variation of environment temperature under the laboratory simulation practical application situation, the technical requirement that has improved the anti-variation of ambient temperature of product.After the test of standard code operating temperature, keep the sample design temperature constant, the any section sensitive element that with length is 0.1 times, 0.2 times, 0.4 times, 0.7 times, 1.0 times maximal use length respectively is installed in the constant temperature oven, be warming up to the temperature of being failure to actuate, product should be in the normal monitoring state, can not report to the police.On the other hand, GB16280-2005 " line-type heat detector " national standard " No. 1 modification is single " influences the performance of renewable type cable linear temperature sensing fire detector when ambient temperature conditions changes, also increased the response performance test under the variation of ambient temperature condition.Therefore foregoing renewable type cable linear temperature sensing fire detector is difficult to reach the requirement of new standard.
For example, temperature raises after the temperature sensing cable of the minimum warning length of prior art renewable type cable linear temperature sensing fire detector is heated, the wire insulation resistance of temperature sensing cable descends, when temperature reaches 85 ℃ of operating temperatures, the temperature sensing cable wire insulation resistance drops to predefined value, carries out fire alarm this moment.This point needs only conformance with standard GB16280-1996 and just can accomplish.With 0.1 times, 0.2 times, 0.4 times, 0.7 times, 1.0 times maximal use lengths, for example do the humid test of being failure to actuate for 200 meters, but at this moment this product can not keep being failure to actuate simultaneously.Suppose that operating temperature is respectively T1, T2, T3, T4, T5, standard code GB16280-2005 operating temperature is that the temperature of being failure to actuate of 85 ℃ of grades is 60 ℃, and the actual alarm temperature meets 85 ℃＞T1＞T2＞T3＞T4＞T5, and has T5＜60 ℃ at least.
Though prior art adopts increases by two core compensating lines, a lot of measures such as length of cable are set at the scene when debugging, and still have a lot of problems in the practical application.For example, Chinese patent 200620133478.2 has proposed a kind of influence that one deck melting plastic layer improves the antagonism variation of ambient temperature that increases, but because the influence of the inherent elastic force of elastic conductor, its recoverable ability reduces inevitably.Chinese patent application numbers 200810096418.1 has proposed a kind of fire detector and alarm method of parallel single wire digital temperature sensor, the temperature sensor of welding in 1 meter the scope that is less than or equal at cable, survey temperature variation accurately by temperature sensor, be not subjected to the influence of variation of ambient temperature; But, it is discontinuous that this patented claim exists temperature to survey, fire temperature between the temperature sensor of parallel connection changes the inherent shortcoming that can not survey, do not meet the requirement of standard GB 16280-2005 " line-type heat detector ", and its sensitive element quantity is many, will welds a temperature sensor every about 1 meter, and only can weld by hand, make trouble, technology falls behind, the cost costliness.
So, need to propose the be failure to actuate technology of temperature grade of a kind of brand-new raising line-type heat detector and satisfy the requirement of standard GB 16280-2005 " line-type heat detector " and " No. 1 revise singly ".
Summary of the invention
Technical matters solved by the invention provides a kind of line-type heat detector, can satisfy standard GB 16280-2005 " line-type heat detector " and " No. 1 modification be'ss single " requirement simultaneously.
Technical scheme is as follows:
A kind of line-type heat detector, comprise: interconnective boxcar and temperature sensing cable, described temperature sensing cable is provided with the core of at least two mutual insulatings, described core external packets is covered with the negative temperature coefficient heat-sensitive insulating material, also comprise: be arranged on the temperature sensor on the described temperature sensing cable and be arranged on the interior signal processor of described boxcar, two pins of described temperature sensor are connected with the conductor of different cores in the described temperature sensing cable respectively; Be provided with threshold value in the described signal processor, described threshold value comprises: alarm threshold value, temperature compensation threshold value, be failure to actuate temperature threshold and insulation resistance action threshold value; When described signal processor receives environment temperature that described temperature sensor transmits for less than described temperature compensation threshold value the time, described signal processor does not carry out temperature compensation; Perhaps, when described signal processor receives described environment temperature that described temperature sensor transmits when being equal to or greater than described temperature compensation threshold value, described signal processor carries out temperature compensation to described alarming threshold value, improve the temperature grade of being failure to actuate, reach the described temperature threshold of being failure to actuate until environment temperature; Perhaps, be failure to actuate during temperature threshold greater than described when described signal processor receives environment temperature that described temperature sensor transmits, described signal processor progressively reduces temperature compensation or cancellation temperature compensation; Perhaps, when the wire insulation resistance that receives described temperature sensing cable when described signal processor drops to described insulation resistance action threshold value, send alerting signal; Perhaps, when the ambient temperature signal that receives when described signal processor is elevated to described alarm threshold value, send alerting signal; Wherein,
Temperature sensor is used for the testing environment temperature, and detected ambient temperature signal is sent to described signal processor;
Signal processor, be used to monitor the situation of change of the insulation resistance between the core of described temperature sensing cable, according to described ambient temperature signal and variation thereof, and the situation of change of described insulation resistance judged whether that fire takes place, and sends alerting signal when fire takes place when having drawn.
Preferably, described signal processor is a single-chip microcomputer.
Preferably, also comprise termination box, described boxcar is connected by described temperature sensing cable with termination box, and described termination box is used so that described temperature sensing cable forms a complete loops.
Preferably, be filled with synthon in the described temperature sensing cable.
Another technical matters solved by the invention provides the method that a kind of line-type heat detector improves the temperature grade of being failure to actuate, and can satisfy standard GB 16280-2005 " line-type heat detector " and " No. 1 modification be'ss single " requirement simultaneously.
Technical scheme is as follows:
A kind of line-type heat detector improves the method for the temperature grade of being failure to actuate, and comprising:
End at temperature sensing cable connects boxcar, and described temperature sensing cable is provided with the core of at least two mutual insulatings, and described core external packets is covered with the negative temperature coefficient heat-sensitive insulating material, is provided with signal processor in the described boxcar; Two pins of described temperature sensor are connected with the conductor of different cores in the described temperature sensing cable respectively;
Be provided with threshold value in the described signal processor, described threshold value comprises: alarm threshold value, temperature compensation threshold value, be failure to actuate temperature threshold and insulation resistance action threshold value; When described signal processor receives environment temperature that described temperature sensor transmits for less than described temperature compensation threshold value the time, described signal processor does not carry out temperature compensation; Perhaps, when receiving the described environment temperature that described temperature sensor transmits, described signal processor is equal to or greater than described temperature compensation threshold value, described signal processor carries out temperature compensation to described alarming threshold value, improve the temperature grade of being failure to actuate, reach the described temperature threshold of being failure to actuate until environment temperature; Perhaps, be failure to actuate during temperature threshold greater than described when described signal processor receives environment temperature that described temperature sensor transmits, described signal processor progressively reduces temperature compensation or cancellation temperature compensation; Perhaps, when the wire insulation resistance that receives described temperature sensing cable when described signal processor drops to described insulation resistance action threshold value, send alerting signal; Perhaps, when the ambient temperature signal that receives when described signal processor is elevated to described alarm threshold value, send alerting signal;
Temperature sensor testing environment temperature, and detected ambient temperature signal sent to described signal processor;
Signal processor is monitored the situation of change of the insulation resistance between the core of described temperature sensing cable, according to described ambient temperature signal and variation thereof, and the situation of change of described insulation resistance judged whether that fire takes place, and sends alerting signal when fire takes place when having drawn.
Further, termination box is connected by described temperature sensing cable with described boxcar, described termination box is used so that described temperature sensing cable forms a complete loops.
The present invention can satisfy standard GB 16280-2005 " line-type heat detector " and " No. 1 modification be'ss single " requirement simultaneously, has solved the deficiency that prior art exists.
Compared with prior art, the present invention only increases the several temperature sensor in old product, do not increase too many cost substantially, can the continuous probe variation of temperature, accomplish constant temperature pattern, differential temperature pattern or different constant temperature pattern fire alarm, carry out short-circuit between conductors or open circuit fault and report to the police.
Description of drawings
Fig. 1 is the circuit connection diagram of the cable linear temperature sensing fire detector of the preferred embodiment of the present invention one;
Fig. 2 is the circuit connection diagram of the cable linear temperature sensing fire detector of the preferred embodiment of the present invention two.
Embodiment
Among the present invention, the signal processor of boxcar is judged with the change information that can recover the temperature sensing cable wire insulation resistance of cable linear temperature sensing fire detector according to the change information of this temperature sensor, draw the judgement that fire condition whether occurs, and then send alerting signal.
The present invention is realized by following technical proposals: in the maximal use length of the temperature sensing cable of the recovered cable linear temperature sensing fire detector that meets GB16280-1996, and even 1 temperature sensor of parcel in less than the length range of 0.1 times of maximal use length.Temperature sensor can be thermistor, thermopair, semiconductor temperature sensor, and perhaps integrated a kind of 1-wire digital temperature sensor comes accurate acquisition environment variation of temperature by this temperature sensor.Because the variation of environment temperature generally is milder, rate of change is little, generally is no more than 1 ℃/min, and variation of temperature is swift and violent relatively a lot of during fire.Among the present invention, by temperature sensor acquisition environment variation of temperature, distinguishing variation of temperature is the variation of environment temperature or the temperature variation that fire causes, further, setting by alarm threshold value in the single-chip microcomputer that changes boxcar, real-time on-site also progressively increases temperature compensation stage by stage, improves the line-type heat detector temperature grade of being failure to actuate.When judging temperature variation owing to fire causes, when perhaps temperature was elevated to environment temperature action this moment threshold values, alerting signal was sent in the fire detector action.
Be that example illustrates principle of work of the present invention below with the line-type heat detector.
Single-chip microcomputer is set with in the boxcar: alarm threshold value, insulation resistance action threshold value, and temperature compensation threshold value, the temperature threshold of being failure to actuate, and divide four kinds of situations to be introduced respectively below.
(1) be during when single-chip microcomputer receives temperature sensor sends in the temperature sensing cable ambient air temperature less than temperature compensation threshold value T5 (unit be ℃); do not carry out temperature compensation; carry out normal fire alarm pattern, promptly drop to insulation resistance action threshold value and just send alerting signal as long as single-chip microcomputer monitors insulation resistance.
(2) receive temperature sensor receives in the temperature sensing cable ambient air temperature when being equal to or greater than temperature compensation threshold value T5 (unit for ℃) when single-chip microcomputer, carry out the temperature compensation of real-time on-site, improve the temperature grade of being failure to actuate of line-type heat detector, until to the temperature threshold of being failure to actuate.Like this, no matter how much length is, because temperature sensor distance at interval is less than 0.1 times of maximal use length, so have at least a temperature sensor and temperature sensing cable to be heated together certainly, can real-time on-site carry out temperature compensation, improve the temperature grade of being failure to actuate.
(3) receive environment temperature when being failure to actuate temperature threshold when what single-chip microcomputer received temperature sensor in the temperature sensing cable, reduce temperature compensation or cancellation temperature compensation.When single-chip microcomputer receives the temperature sensing cable wire insulation resistance when dropping to insulation resistance action threshold value, carry out fire alarm.
When (4) temperature signal that receives temperature sensor when single-chip microcomputer is elevated to alarm threshold value, carry out fire alarm.
Below in conjunction with accompanying drawing and preferred embodiment, technical scheme of the present invention is described in further details.
As shown in Figure 1, the circuit connection diagram of the cable linear temperature sensing fire detector of the preferred embodiment of the present invention one.
Cable linear temperature sensing fire detector comprises temperature sensing cable 2, its boxcar 1 and termination box 3, and boxcar 1 and termination box 3 are connected the two ends of temperature sensing cable 2.Boxcar 1 is provided with signal processor, and herein, signal processor is selected single-chip microcomputer for use, and single-chip microcomputer is used for receiving the temperature variation signal of temperature sensing cable 2 and handling, and termination box 3 is to make temperature sensing cable 2 form the device of a complete loops.Temperature sensing cable 2 comprises 5 cores (L1, L2, L3, L4 and L5); Core L1 and L2 external packets are covered with negative temperature coefficient heat-sensitive insulating material 21, and core L1 and L2 are stranded mutually.In the present embodiment, temperature sensor 23 is selected 1-wire digital temperature sensor DS18B20 for use, and 1-wire digital temperature sensor DS18B20 core needs two cores at least, also can be three cores, and present embodiment uses three cores, and three pins are promptly arranged.The outer attached insulating material 22 of core L3, L4 and L5, cut core L3, L4 and L5 insulating material 22, three pins of temperature sensor 23 are welded on respectively on core L3, L4 and the L5, carry out insulation between the pin of temperature sensor 23 and between core L3, L4 and the L5 mutually.If the maximal use length of temperature sensing cable 2 is L, then length＜the 0.1L between the temperature sensor 23.Be welded with core L3, L4 and L5 and the core L1 and the mutual pair twist of L2 of temperature sensor 23, perhaps parallel placement.Can also perhaps, form sheath 24 at the outer extrusion molding one deck plastics of above-mentioned temperature sensing cable 2 or the sheath 24 of rubber at above-mentioned temperature sensing cable 2 outer one deck plastics or the rubber bands of twining.
As shown in Figure 2, the circuit connection diagram of the cable linear temperature sensing fire detector of the preferred embodiment of the present invention two.
Cable linear temperature sensing fire detector is made up of sensitive element temperature sensing cable 2 and coupled boxcar 1.Boxcar 1 is provided with signal processor, and herein, signal processor is selected single-chip microcomputer for use, and single-chip microcomputer is used for receiving the temperature variation signal of temperature sensing cable and handles.Temperature sensing cable 2 comprises seven cores, and core L1 and L2 are coated with negative temperature coefficient heat-sensitive insulating material 21, and core L6, L7 are coated with insulating material 22, and core L1, L2, L6, L7 are stranded mutually.The core of 1-wire digital temperature sensor DS18B20 needs two cores at least, also can be three cores, and present embodiment uses core L3, L4 and L5.Core L3, L4 and L5 are coated with insulating material 22, cut the insulating material 22 of core L3, L4 and L5, three pins of temperature sensor 23 are welded on respectively on core L3, L4 and the L5, carry out insulation mutually between temperature sensor 23 pins and between core L3, L4 and the L5.The maximal use length of temperature sensing cable 2 is L, then length＜the 0.1L between the temperature sensor 23.Be welded with core L3, L4, L5 and the mutual pair twist of core L1, L2 or the parallel placement of temperature sensor 23, can also be at the outer extrusion molding one deck plastics of temperature sensing cable 2 or the sheath 24 of rubber, perhaps, form sheath 24 at temperature sensing cable 2 outer one deck plastics or the rubber bands of twining.
With the core L1 of boxcar 1 a relative end and two bare exposed conductor kinks of L6 back solderings, keep good short circuit on the temperature sensing cable 2, two bare exposed conductor kinks of core L2 and core L7 back solderings keep good short circuit.And do waterproof, the moistureproof processing with heat-shrink tube or mackintosh separately respectively.Core L1, L2, L6 and L7 four-core formation loop turn back in the boxcar 1 like this.Core L3, the L4 of temperature sensing cable 2 and L5 do waterproof, the moistureproof processing with heat-shrink tube or mackintosh separately respectively, make it keep insulation each other.
In aforementioned, because it is the digital signal that transmits by unibus that DS18B20 sends to signal processor with detected temperature information, and the variable signal of the detected wire insulation resistance of signal processor is a simulating signal, these two kinds of signals can not influence each other by the common transmission of identical lead, so signal processor can be isolated this two kinds of signals more conveniently.Therefore, the core of temperature sensing cable 2 can reduce at least two cores.Two cores of temperature sensing cable 2 are coated with the negative temperature coefficient heat-sensitive insulating material by extrusion molding, and the core that is coated with the negative temperature coefficient heat-sensitive insulating material is combined closely mutually by stranded or external force squeezing action, and a stable insulation resistance value is provided between core.The bipod of temperature sensor 23 directly is welded on these two cores, thereby reduces the core diameter of temperature sensing cable, makes it soft more, convenient-laying.In order to improve the tensile strength of temperature sensing cable 2, also in order to make temperature sensing cable 2 appearances slicker and more sly, can the filling glass silk in the temperature sensing cable 2 etc. synthon.
Below in conjunction with preferred embodiment one and two, be that 85 ℃ grade comes the principle of work of cable linear temperature sensing fire detector is described in further details with alarm threshold value in the constant temperature alarm mode, other grade can be by that analogy.Standard code, GB16280-2005 operating temperature are that the temperature of being failure to actuate of 85 ℃ of grades is 60 ℃, and the actual alarm temperature when not having temperature sensor meets 85 ℃＞T1＞T2＞T3＞T4＞T5, and have T5＜60 ℃ at least.
Single-chip microcomputer is set in the boxcar 1: alarm threshold value is 85 ℃, and the temperature compensation threshold value is T5, and the temperature threshold of being failure to actuate is 60 ℃, and insulation resistance action threshold value can be changed by the programmed control of setting according to environment temperature in single-chip microcomputer.
Divide four kinds of situations to be introduced respectively below.
(1) receive temperature sensor 23 transmits in the temperature sensing cable 2 environment temperature for less than temperature compensation threshold value T5 the time when single-chip microcomputer, single-chip microcomputer does not carry out temperature compensation; Have only as core L1, L2 (embodiment one), or the insulation resistance between L1, L2, L6, the L7 (embodiment two) is during less than insulation resistance action threshold value, single-chip microcomputer sends alerting signal.
(2) when single-chip microcomputer receive that temperature sensor 23 transmits in the temperature sensing cable 2 environment temperature when being equal to or greater than temperature compensation threshold value T5 (unit ℃), single-chip microcomputer carries out temperature compensation at this moment, improve the temperature grade of being failure to actuate of line-type heat detector, reach 60 ℃ of the temperature thresholds of being failure to actuate until environment temperature.
(3) receive temperature sensor 23 transmits in the temperature sensing cable 2 environment temperature when being 60 ℃ greater than the temperature threshold of being failure to actuate when single-chip microcomputer, single-chip microcomputer progressively reduces temperature compensation or cancellation temperature compensation.The wire insulation resistance that boxcar 1 receives temperature sensing cable 2 carries out fire alarm when dropping to the insulation resistance action threshold value of setting this moment.
So, no matter whether there are temperature sensor 23 and temperature sensing cable 2 to be heated together, can accurately send fire alarm.
(4) further, when the temperature signal that receives when temperature sensor 23 was elevated to 85 ℃ of alarm threshold values, single-chip microcomputer sent alerting signal, carries out fire alarm.
When testing as being failure to actuate, no matter how much length is, because temperature sensor 23 distance at interval is less than 0.1 times of maximal use length, so have at least a temperature sensor 23 and temperature sensing cable 2 to be heated together certainly, as long as the environment temperature that temperature sensor 23 transmits is less than the temperature threshold of being failure to actuate, temperature compensation that just can real-time on-site improves the temperature grade of being failure to actuate.
Like this in the response performance test under the variation of ambient temperature condition that " No. 1 modification is single " increases, temperature sensing cable length is respectively 0.4,0.7,0.9 times of maximal use length in the A incubator, temperature sensing cable length is minimum warning length in the B incubator, so the rarest temperature sensor in the A incubator, before 60 ℃, carry out temperature compensation; After arriving 60 ℃, progressively reduce temperature compensation or cancellation temperature compensation, as long as the B incubator arrives 85 ℃, boxcar receives the temperature sensing cable wire insulation resistance and drops to the value of setting this moment, just can carry out fire alarm, no matter have or not temperature sensor in the B incubator.So the present invention can satisfy standard GB 16280-2005 " line-type heat detector " and " No. 1 modification be'ss single " requirement fully.
In aforementioned, if a value is arranged greater than being failure to actuate 60 ℃ of temperature thresholds among T1, T2, T3, T4, the T5, then the distance between the temperature sensor can also prolong in the temperature sensing cable.For example: T1＞60 ℃＞T2＞T3＞T4＞T5, the result of the test of being failure to actuate of 0.1 times of maximal use length can satisfy the requirement of new standard in just original technology, the distance of temperature sensor can extend to and be not more than 0.2 times of maximal use length in the temperature sensing cable so, but no longer than 0.4 times of maximal use length, guarantee to have 1 temperature sensor in the A incubator in the temperature sensing cable length range at least in the response performance test under the variation of ambient temperature condition that " No. 1 modification is single " increases.Temperature compensation can being failure to actuate on-test from 0.2 times of maximal use length like this.
Claims (6)
1. line-type heat detector, comprise: interconnective boxcar and temperature sensing cable, described temperature sensing cable is provided with the core of at least two mutual insulatings, described core external packets is covered with the negative temperature coefficient heat-sensitive insulating material, it is characterized in that, also comprise: be arranged on the temperature sensor on the described temperature sensing cable and be arranged on the interior signal processor of described boxcar, two pins of described temperature sensor are connected with the conductor of different cores in the described temperature sensing cable respectively; Be provided with threshold value in the described signal processor, described threshold value comprises: alarm threshold value, temperature compensation threshold value, be failure to actuate temperature threshold and insulation resistance action threshold value; When described signal processor receives environment temperature that described temperature sensor transmits for less than described temperature compensation threshold value the time, described signal processor does not carry out temperature compensation; Perhaps, when described signal processor receives described environment temperature that described temperature sensor transmits when being equal to or greater than described temperature compensation threshold value, described signal processor carries out temperature compensation to described alarming threshold value, improve the temperature grade of being failure to actuate, reach the described temperature threshold of being failure to actuate until environment temperature; Perhaps, be failure to actuate during temperature threshold greater than described when described signal processor receives environment temperature that described temperature sensor transmits, described signal processor progressively reduces temperature compensation or cancellation temperature compensation; Perhaps, when the wire insulation resistance that receives described temperature sensing cable when described signal processor drops to described insulation resistance action threshold value, send alerting signal; Perhaps, when the ambient temperature signal that receives when described signal processor is elevated to described alarm threshold value, send alerting signal; Wherein
Temperature sensor is used for the testing environment temperature, and detected ambient temperature signal is sent to described signal processor;
Signal processor, be used to monitor the situation of change of the insulation resistance between the core of described temperature sensing cable, according to described ambient temperature signal and variation thereof, and the situation of change of described insulation resistance judged whether that fire takes place, and sends alerting signal when fire takes place when having drawn.
2. line-type heat detector as claimed in claim 1 is characterized in that: described signal processor is a single-chip microcomputer.
3. line-type heat detector as claimed in claim 1 is characterized in that: also comprise termination box, described boxcar is connected by described temperature sensing cable with termination box, and described termination box is used so that described temperature sensing cable forms a complete loops.
4. line-type heat detector as claimed in claim 1 is characterized in that: be filled with synthon in the described temperature sensing cable.
5. a line-type heat detector improves the method for the temperature grade of being failure to actuate, and comprising:
End at temperature sensing cable connects boxcar, and described temperature sensing cable is provided with the core of at least two mutual insulatings, and described core external packets is covered with the negative temperature coefficient heat-sensitive insulating material, is provided with signal processor in the described boxcar; Two pins of described temperature sensor are connected with the conductor of different cores in the described temperature sensing cable respectively;
Be provided with threshold value in the described signal processor, described threshold value comprises: alarm threshold value, temperature compensation threshold value, be failure to actuate temperature threshold and insulation resistance action threshold value; When described signal processor receives environment temperature that described temperature sensor transmits for less than described temperature compensation threshold value the time, described signal processor does not carry out temperature compensation; Perhaps, when receiving the described environment temperature that described temperature sensor transmits, described signal processor is equal to or greater than described temperature compensation threshold value, described signal processor carries out temperature compensation to described alarming threshold value, improve the temperature grade of being failure to actuate, reach the described temperature threshold of being failure to actuate until environment temperature; Perhaps, be failure to actuate during temperature threshold greater than described when described signal processor receives environment temperature that described temperature sensor transmits, described signal processor progressively reduces temperature compensation or cancellation temperature compensation; Perhaps, when the wire insulation resistance that receives described temperature sensing cable when described signal processor drops to described insulation resistance action threshold value, send alerting signal; Perhaps, when the ambient temperature signal that receives when described signal processor is elevated to described alarm threshold value, send alerting signal;
Temperature sensor testing environment temperature, and detected ambient temperature signal sent to described signal processor;
Signal processor is monitored the situation of change of the insulation resistance between the core of described temperature sensing cable, according to described ambient temperature signal and variation thereof, and the situation of change of described insulation resistance judged whether that fire takes place, and sends alerting signal when fire takes place when having drawn.
6. line-type heat detector as claimed in claim 5 improves the method for the temperature grade of being failure to actuate, it is characterized in that: termination box is connected by described temperature sensing cable with described boxcar, and described termination box is used so that described temperature sensing cable forms a complete loops.
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| CN101944264A (en) * | 2010-08-31 | 2011-01-12 | 曾学义 | Cable line type temperature-sensing fire detector |
| CN102163359A (en) * | 2011-04-12 | 2011-08-24 | 李萍 | Linear temperature sensor with spare loop |
| CN102842201B (en) * | 2011-06-24 | 2014-03-12 | 刘忠顺 | Linear temperature sensor capable of being self-adaptive to environmental variation and monitoring method thereof |
| CN104198076A (en) * | 2014-08-26 | 2014-12-10 | 安徽蓝德仪表有限公司 | Multifunctional linear temperature sensor |
| CN109119266A (en) * | 2018-09-07 | 2019-01-01 | 贵州长通线缆有限公司 | A kind of contact under adaptive cable core high-low temperature difference guarantees device |
| CN114255561A (en) * | 2021-12-21 | 2022-03-29 | 中车大连机车研究所有限公司 | Novel cable type linear temperature-sensing detector |
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| CN101667318A (en) | 2010-03-10 |
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