CN101944264A - Cable line type temperature-sensing fire detector - Google Patents
Cable line type temperature-sensing fire detector Download PDFInfo
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- CN101944264A CN101944264A CN 201010267916 CN201010267916A CN101944264A CN 101944264 A CN101944264 A CN 101944264A CN 201010267916 CN201010267916 CN 201010267916 CN 201010267916 A CN201010267916 A CN 201010267916A CN 101944264 A CN101944264 A CN 101944264A
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Abstract
The invention discloses a cable line type temperature-sensing fire detector which comprises a switching box and a temperature-sensing cable which are connected with each other, wherein a wire core is arranged in the temperature-sensing cable. The fire detector also comprises a signal processor and a comparison circuit which are arranged in the switching box and a first lead wire and a second lead wire which are arranged in the temperature-sensing cable, wherein a sensitive element is arranged between the first lead wire and the second lead wire, and the sensitive element is used for sensing the change of environmental temperature and sending the detected temperature change information of the environmental temperature to the comparison circuit; the comparison circuit is connected among the wire core, the first lead wire, the second lead wire and the signal processor and is used for converting the temperature change information into signals which can be recognized by the signal processor and sending the signals to the signal processor; and an alarm threshold is set in the signal processor, the received temperature change information is compared with the alarm threshold, and alarm signals can be sent out when the temperature change information exceeds the alarm threshold.
Description
Technical field
The present invention relates to a kind of fire detection technology, specifically, relate to a kind of cable linear temperature sensing fire detector.
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 the renewable type cable linear temperature sensing fire detector of prior art conformance with standard GB16280-1996 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.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 of prior art 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 cable linear temperature sensing fire 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 cable linear temperature sensing fire detector, comprise: interconnective boxcar and temperature sensing cable, be provided with core in the described temperature sensing cable, also comprise: be arranged on signal processor, the comparator circuit in the described boxcar and be arranged on first lead and second lead in the described temperature sensing cable, between described first lead and second lead, be provided with sensitive element; Described core, first lead and the second lead mutual insulating, wherein,
Sensitive element is used to experience the variation of environment temperature, and the temperature information of detected environment temperature is sent to described comparator circuit;
Comparator circuit is connected between core, first lead and second lead and the described signal processor, is used for described temperature information is changed into the discernible signal of described signal processor, and sends to described signal processor;
Signal processor is provided with alarm threshold value, and the described temperature information and the described alarm threshold value that receive are compared, the alert signal of transmitting messages when described temperature information surpasses described alarm threshold value.
Further: described signal processor is a single-chip microcomputer.
Further: described sensitive element adopts temperature detect switch (TDS) combination, melting insulating material, positive temperature coefficient (PTC) insulating material, negative temperature coefficient insulating material or critical temperature temperature-sensitive insulating material.
Further: described temperature detect switch (TDS) combination comprises normally closed temperature detect switch (TDS) and the Chang Kai temperature detect switch (TDS) that is in series.
Further: described temperature detect switch (TDS) combination is adopted and is often driven temperature detect switch (TDS).
Further: described melting insulating material is coated in described first lead and the second lead outside.
Further: also comprise privates, described privates respectively with described first lead and second wire insulation, often drive temperature detect switch (TDS) being respectively arranged with between described first lead and second wire insulation and between the privates and second wire insulation.
Further: described temperature information is switching value signal or the resistance variations analog signals related with environment temperature.
Further: described signal processor is provided with at least one alarm threshold value.
Further: described temperature sensing cable is connected with termination box.
Technique effect comprises:
1, 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.
2, cable linear temperature sensing fire detector of the present invention need not obtain concrete environment temperature occurrence, adopts mechanical temperature detect switch (TDS)s such as a kind of thermometal or memorial alloy, and a switch contact signal is provided when different environment temperatures; Perhaps be coated with the temperature sensing cable of the insulating material (melting insulating material, NTC, PTC or CTR material) of temperature-sensitive by another root, a resistance variations signal related with environment temperature is provided, can set fire temperature according to this signal and survey the different action threshold value of temperature sensing cable, temperature grade thereby the raising cable linear temperature sensing fire detector is failure to actuate.That the present invention has is simple and reliable, cost is low, and the design of boxcar is convenient, is easy to advantages such as production in enormous quantities.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention one;
Fig. 2 is the structural representation of the embodiment of the invention two;
Fig. 3 is the structural representation of the embodiment of the invention three;
Fig. 4 is the structural representation of the embodiment of the invention four.
Embodiment
Cable linear temperature sensing fire detector of the present invention, outside the core of parcel negative temperature coefficient megohmite insulant, increase the lead of two mutually insulateds, sensitive element is set between lead, and sensitive element can adopt temperature detect switch (TDS) combination or temperature-sensitive insulating material (melting insulating material, NTC megohmite insulant, PTC megohmite insulant or CTR).
The invention provides the mode of following several employing sensitive elements, mode one, the combination of every group of temperature detect switch (TDS) is the normally closed temperature detect switch (TDS) of often opening a rated function temperature 〉=TB of temperature detect switch (TDS) series connection by a rated function temperature≤TA, wherein TA＜TB; Mode two, the combination of temperature detect switch (TDS) are often driven temperature detect switch (TDS) by one and are formed; Mode three is coated with the temperature sensing cable of sensitive element (melting insulating material, NTC megohmite insulant, PTC megohmite insulant or CTR megohmite insulant) by another root, and a resistance variations signal related with environment temperature is provided.
Among the present invention, front end at single-chip microcomputer is provided with comparator circuit, each core of comparator circuit and temperature sensing cable is connected, and in the reception temperature sensing cable temperature sensing material resistance with the change information with environment temperature of the variation of environment temperature or temperature detect switch (TDS) combination, carry out processing such as filtering, noise reduction, amplification, be processed into voltage or current signal that single-chip microcomputer can be discerned, and send single-chip microcomputer to, single-chip microcomputer is comprehensively judged this information.
Be that 85 ℃ of grades illustrate principle of work of the present invention with operating temperature in the constant temperature alarm mode of temperature detect switch (TDS) unitized construction below, other grade or different constant temperature pattern can be by that analogy.
Outside the core of cable linear temperature sensing fire detector parcel negative temperature coefficient megohmite insulant, increase the lead of two mutually insulateds, between these two leads, in less than 0.1 times of maximal use length scope, evenly connect one group of temperature detect switch (TDS) combination.The temperature detect switch (TDS) combination of some is arranged in each loop like this, and be in parallel the relation between each combination.Single-chip microcomputer in the boxcar makes up the change information of experiencing environment temperature according to temperature detect switch (TDS), compare with the change information of the temperature sensing cable wire insulation resistance of cable linear temperature sensing fire detector, the predetermined method of follow procedure changes the setting of alarm threshold value in the single-chip microcomputer of boxcar, improves the line-type heat detector temperature grade of being failure to actuate.
According to illustrating in the background technology, have TA≤T5,60 ℃＜TB≤85 ℃ at least.When temperature was lower than TA, the temperature detect switch (TDS) combination was often left, and the alarm threshold value that single-chip microcomputer is set is X1; When temperature is elevated to TA, often open the temperature detect switch (TDS) closure, temperature detect switch (TDS) makes up to closure signal of boxcar, and the alarm threshold value that single-chip microcomputer is set is X2; When temperature is elevated to TB, normally closed temperature detect switch (TDS) action is opened, because making up, temperature detect switch (TDS) connects, so though normally closed temperature detect switch (TDS) closure, but temperature detect switch (TDS) make up to boxcar be a start signal, the alarm threshold value that single-chip microcomputer is set reverts to X1.From reaching the complexity of alarm threshold value, X1＜X2 is arranged.
1. work as environment temperature and be lower than TA
1) temperature sensing cable of minimum warning length is heated, and should also not have the temperature detect switch (TDS) combination in the minimum warning length.
Boxcar receives not variation of temperature detect switch (TDS) combination in the temperature sensing cable.After temperature raise, the wire insulation resistance of temperature sensing cable descended, and when temperature reaches 85 ℃, boxcar receives the temperature sensing cable wire insulation resistance and drops to predefined value X1, carries out fire alarm at this moment.
2) temperature sensing cable of minimum warning length is heated, but should in the minimum warning length a pair of temperature detect switch (TDS) combination be arranged.
Though when temperature is elevated to TA, often open the temperature detect switch (TDS) closure, temperature detect switch (TDS) makes up to closure signal of boxcar, the alarm threshold value that single-chip microcomputer is set is X2.But when temperature is elevated to TB, normally closed temperature detect switch (TDS) action is opened, because making up, temperature detect switch (TDS) connects, so though normally closed temperature detect switch (TDS) closure, temperature detect switch (TDS) makes up the still start signal to boxcar, and the alarm threshold value that single-chip microcomputer is set reverts to X1.Therefore the cable linear temperature sensing fire detector operating temperature can be reported to the police about 85 ℃.
2. work as environment temperature and reach TA
1) be elevated to TA when temperature, often open the temperature detect switch (TDS) closure, temperature detect switch (TDS) makes up to closure signal of boxcar, and the alarm threshold value that single-chip microcomputer is set is X2.The degree of cable linear temperature sensing fire detector wire insulation resistance decline does not at this moment reach X2, so cable linear temperature sensing fire detector is failure to actuate.Because TA≤T5＜60 ℃, mean that cable linear temperature sensing fire detector begins after 60 ℃ even 60 ℃ temperature sections from TA and can be failure to actuate, so improved the temperature performance of being failure to actuate of cable linear temperature sensing fire detector.
2) when temperature continuation rising, insulation resistance decline degree reaches X2 when between the cable linear temperature sensing fire detector negative temperature coefficient core that single-chip microcomputer in the boxcar is measured; Perhaps temperature is elevated to TB, normally closed temperature detect switch (TDS) action is opened, the alarm threshold value that single-chip microcomputer is set reverts to X1, the degree that insulation resistance descends when between the cable linear temperature sensing fire detector negative temperature coefficient core that single-chip microcomputer is measured reaches X1, and cable linear temperature sensing fire detector can also carry out fire alarm.
Compared with prior art, the present invention only increases the several temperature switch combination in old product, substantially do not increase too many cost, can the continuous probe cable linear temperature sensing fire detector change, accomplish constant temperature pattern, differential temperature pattern or different constant temperature pattern fire alarm with the wire insulation resistance of temperature.Can carry out short-circuit between conductors or open circuit fault and report to the police, satisfy standard GB 16280-2005 " line-type heat detector " and revise single requirement No. 1.
Below with reference to accompanying drawing and preferred embodiment, technical solution of the present invention is described in detail.
Embodiment one
As shown in Figure 1, be the structural representation of the embodiment of the invention one.Embodiment 1 comprises boxcar 1, temperature sensing cable 2 and termination box 3, original temperature sensing cable 2 comprises core L1 and core L2, core L1 and core L2 are enclosed with negative temperature coefficient megohmite insulant 21, present embodiment one has increased the lead L3 and the lead L4 of two wrap insulate materials 22 (as high temperature PVC, PE etc.) and mutually insulated at temperature sensing cable 2, can be parallel, stranded between core L1, core L2, lead L3 and the lead L4 or the dual mode combination place.Termination box 3 is to make temperature sensing cable 2 form the device of a complete loops.
In less than the length range of 0.1 times of maximal use length, evenly connect a pair of temperature detect switch (TDS) combination between lead L3, the lead L4, comprise that a normally closed temperature detect switch (TDS) 23 and one often drive temperature detect switch (TDS) 24, the combination of every pair of temperature detect switch (TDS) be by a rated function temperature be 1 rated function temperature of normally closed temperature detect switch (TDS) 23 series connection of TA be TB often open temperature detect switch (TDS) 24, wherein TA＜TB; Normally closed temperature detect switch (TDS) 23 and Chang Kai temperature detect switch (TDS) 24 have two lead-in wires, and normally closed temperature detect switch (TDS) 23 after the series connection and Chang Kai temperature detect switch (TDS) 24 are connected between lead L3, the lead L4.There is quantity to be not more than 10 pairs of temperature detect switch (TDS) combinations like this in each loop, and is in parallel the relation between each combination.Single-chip microcomputer in the boxcar 1 is experienced the change information of environment temperature according to temperature detect switch (TDS), compare with the change information of the temperature sensing cable wire insulation resistance that can recover cable linear temperature sensing fire detector, the predetermined method of follow procedure changes the setting of alarm threshold value X in the single-chip microcomputer of boxcar, improves the line-type heat detector temperature grade of being failure to actuate.
In the present embodiment, the lead-in wire that respectively has of each temperature detect switch (TDS) of temperature detect switch (TDS) combination is welded to each other together, and two other lead-in wires of temperature detect switch (TDS) combination are welded on respectively on L3, the L4.Weld is carried out insulation, waterproof and dustproof, can increase external insulation layer 25 in the good back of welding, perhaps wraps with insulating tape.
Also can be behind extrusion molding external insulation layer 25, sever external insulation layer 25 welding temperature detect switch (TDS)s combinations, with the metal tube encapsulation, fill heat-conducting glue in the pipe then, perhaps welding good after plastic packaging together.
Single-chip microcomputer is as a kind of signal processor, be used to monitor the situation of change of the core core L1 and the insulation resistance between core L2, lead L3 and the lead L4 of described temperature sensing cable 2, and judged whether that according to the situation of change of insulation resistance fire takes place, when taking place, sends fire alerting signal when having drawn.
Embodiment two
As shown in Figure 2, be the structural representation of the embodiment of the invention two.Embodiment two comprises boxcar 1, temperature sensing cable 2 and termination box 3, and original temperature sensing cable 2 comprises: core L1, core L2, and be enclosed with negative temperature coefficient megohmite insulant 21; Present embodiment two increases lead L3, lead L4 and the lead L5 of 3 wrap insulate materials 22 (as high temperature PVC, PE etc.) mutually insulated outside core L1, the L2 of temperature sensing cable 2, can parallel, stranded or dual mode combination placement between core L1, core L2, lead L3, lead L4, the lead L5.What evenly connect a rated function temperature between lead L3, the lead L4 lead and be TA in less than the length range of 0.1 times of maximal use length often drives temperature detect switch (TDS) 24; What connect simultaneously a rated function temperature and be TB between lead L4, lead L5 often drives temperature detect switch (TDS) 26, and wherein TA＜TB often drives temperature detect switch (TDS) 24 and Chang Kai temperature detect switch (TDS) 26 and has two lead-in wires.There is quantity to be not more than 10 pairs of temperature detect switch (TDS) combinations like this in each loop, and is in parallel the relation between each combination.Embodiment 2 temperature detect switch (TDS)s combinations is that the temperature detect switch (TDS) of two different temperatures grades can be respectively to the different variation of ambient temperature signal of single-chip microcomputer in the boxcar 1 by lead L3, lead L4 and lead L4, lead L5, thereby the predetermined method of follow procedure is provided with different alarm threshold value X1 and X2, improves the line-type heat detector temperature grade of being failure to actuate.
In the temperature detect switch (TDS) combination, two lead-in wires often opening temperature detect switch (TDS) 24 and 26 are welded on respectively on lead L3, lead L4 or lead L4, the lead L5.Weld is carried out insulation, waterproof and dustproof, can increase external insulation layer 25 in the good back of welding, perhaps wraps with insulating tape.
Also can be behind extrusion molding external insulation layer 25, sever sheath and weld the temperature detect switch (TDS) combination, with the metal tube encapsulation, fill heat-conducting glue in the pipe then, perhaps welding good after plastic packaging together.
Be the principle of work that 85 ℃ of grades illustrate present embodiment two with operating temperature in the constant temperature alarm mode below, other grade or different constant temperature pattern can be by that analogy.
Among the embodiment two, as public pole, be provided with between lead L3, the lead L4 and often drive temperature detect switch (TDS) 24, be connected in the single-chip microcomputer of boxcar 2 with lead L4; Be provided with between lead L4, the lead L5 and often drive temperature detect switch (TDS) 26, be connected in the single-chip microcomputer of boxcar 2, single-chip microcomputer is discerned two switching signals respectively, sets different alarm threshold value X1, X2.
1. work as environment temperature and be lower than TA
1) temperature sensing cable of minimum warning length is heated, and should also not have the temperature detect switch (TDS) combination in the minimum warning length.
Boxcar receives not variation of temperature detect switch (TDS) combination in the temperature sensing cable.After temperature raise, the wire insulation resistance of temperature sensing cable descended, and when temperature reaches 85 ℃, boxcar receives the temperature sensing cable wire insulation resistance and drops to predefined value X1, carries out fire alarm at this moment.
2) temperature sensing cable of minimum warning length is heated, but should in the minimum warning length a pair of temperature detect switch (TDS) combination be arranged.
Though when temperature is elevated to TA, often open the temperature detect switch (TDS) closure, the temperature detect switch (TDS) 24 of often opening between lead L3 and the lead L4 is given closure signal of boxcar, and the alarm threshold value that single-chip microcomputer is set is X2.But when temperature is elevated to TB, often open temperature detect switch (TDS) 26 closures, the temperature detect switch (TDS) 26 of often opening between lead L4, the lead L5 is given another closure signal of boxcar, and the alarm threshold value that single-chip microcomputer is set reverts to X1.Therefore the cable linear temperature sensing fire detector operating temperature can be reported to the police about 85 ℃.
2. work as environment temperature and reach TA
1) be elevated to TA when temperature, often open temperature detect switch (TDS) 24 closures, L3, L4 temperature detect switch (TDS) make up to 1 one closure signal of boxcar, and the alarm threshold value that single-chip microcomputer is set is X2.At this moment the degree that descends of cable linear temperature sensing fire detector wire insulation resistance does not reach X2, so being failure to actuate of cable linear temperature sensing fire detector.Because TA≤T5＜60 ℃, mean that cable linear temperature sensing fire detector begins after 60 ℃ even 60 ℃ temperature sections from TA and can be failure to actuate, so improved the temperature performance of being failure to actuate of cable linear temperature sensing fire detector.
2) when temperature continuation rising, the degree that the cable linear temperature sensing fire detector wire insulation resistance descends reaches X2; Perhaps temperature is elevated to TB, often open temperature detect switch (TDS) 26 closures, the temperature detect switch (TDS) 26 of often opening between lead L4, the lead L5 is given another closure signal of boxcar, the alarm threshold value that single-chip microcomputer is set reverts to X1, the degree that the cable linear temperature sensing fire detector wire insulation resistance descends only need reach X1, and cable linear temperature sensing fire detector can also carry out fire alarm.
Embodiment three
As shown in Figure 3, be the structural representation of the embodiment of the invention three.Embodiment three comprises: boxcar 1, temperature sensing cable 2 and termination box 3, temperature sensing cable 2 is provided with core L1, the core L2 of parcel negative temperature coefficient megohmite insulant 21, increased lead L3, the lead L4 of two wrap insulate materials 22 (as high temperature PVC, PE etc.) and mutually insulated, can parallel, stranded or dual mode combination placement between core L1, core L2, lead L3, the lead L4.What evenly connect a rated function temperature between lead L3, the lead L4 and be TA in less than the length range of 0.1 times of maximal use length often drive temperature detect switch (TDS) 24, and each often to open between the temperature detect switch (TDS) 24 be relation in parallel.Often drive temperature detect switch (TDS) 24 and can pass through lead L3, lead L4 to the different variation of ambient temperature signal of single-chip microcomputer in the boxcar 1, thereby the predetermined method of follow procedure is provided with different alarm threshold value X1 and X2, improves the line-type heat detector temperature grade of being failure to actuate.
Often open 24 2 lead-in wires of temperature detect switch (TDS) and be welded on lead L3 and lead L4 respectively.Weld is carried out insulation, waterproof and dustproof, can increase external insulation layer 25 in the good back of welding, perhaps wraps with insulating tape.Also can be behind extrusion molding external insulation layer 25, sever external insulation layer 25 and weld the temperature detect switch (TDS) combination, with the metal tube encapsulation, fill heat-conducting glue in the pipe then, perhaps welding good after plastic packaging together.
Be the principle of work that 85 ℃ of grades illustrate present embodiment 3 with operating temperature in the constant temperature alarm mode below, other grade or different constant temperature pattern can be by that analogy.
With a pair of temperature detect switch (TDS) 24 of often opening among lead L3, the lead L4 is example, and a pair of often opening in the single-chip microcomputer that temperature detect switch (TDS) 24 all is connected to boxcar 2 when temperature is elevated to the operating temperature of often driving temperature detect switch (TDS) 24, given closure signal of single-chip microcomputer; When temperature is lower than the operating temperature of often driving temperature detect switch (TDS) 24, the unlatching that resets of temperature detect switch (TDS) contact.Single-chip microcomputer identification is set different alarm threshold value X1, X2 from the switching signal of temperature detect switch (TDS).
1. work as environment temperature and be lower than TA
The temperature sensing cable 2 of minimum warning length is heated, and should also often not open temperature detect switch (TDS) 24 combinations in the minimum warning length.
Boxcar 1 receives not variation of temperature detect switch (TDS) combination in the temperature sensing cable 2.After temperature raise, the wire insulation resistance of temperature sensing cable 2 descended, and when temperature reaches 85 ℃, boxcar 2 receives temperature sensing cables 2 wire insulation resistances and drops to predefined value X1, carries out fire alarm at this moment.
2. work as environment temperature and reach TA
When temperature is elevated to TA, often open temperature detect switch (TDS) 24 closures, the temperature detect switch (TDS) between lead L3 and the L4 makes up to 1 one closure signal of boxcar, and the alarm threshold value that single-chip microcomputer is set is X2.At this moment the degree that descends of cable linear temperature sensing fire detector wire insulation resistance does not reach X2, so being failure to actuate of cable linear temperature sensing fire detector.Because TA≤T5＜60 ℃ mean that cable linear temperature sensing fire detector begins to 60 ℃ from TA, even temperature sections can be failure to actuate after 60 ℃, so improved the temperature performance of being failure to actuate of cable linear temperature sensing fire detector.
When temperature continuation rising, the degree that the cable linear temperature sensing fire detector wire insulation resistance descends reaches X2, and cable linear temperature sensing fire detector can also carry out fire alarm.After temperature drops to the operating temperature of temperature detect switch (TDS), often drive temperature detect switch (TDS) 24 and reset, single-chip microcomputer recovers predefined alarm threshold value X1.Set the value of TA, X1, X2 by test, can improve the ability of the anti-variation of ambient temperature of cable linear temperature sensing fire detector effectively.
By different combinations, the perhaps temperature detect switch (TDS) of greater number different temperatures grade combination, many cores can be realized setting different action threshold values, improve the temperature of being failure to actuate under the varying environment temperature.
Embodiment four
The temperature-sensitive insulating material is divided into positive temperature coefficient (PTC) (PTC) insulating material, negative temperature coefficient (NTC) insulating material and critical temperature temperature-sensitive (CTR, Critical Temperature Resistor) insulating material according to the temperature coefficient difference.The typical feature of temperature-sensitive insulating material is to responsive to temperature, shows different resistance values under the different temperature; Positive temperature coefficient (PTC) temperature-sensitive insulating material resistance value when temperature is high more is big more, and negative temperature coefficient temperature-sensitive insulating material resistance value when temperature is high more is low more, and they belong to semiconductor devices.
Also having a kind of temperature-sensitive insulating material is can keep good insulation performance at normal temperature, and when reaching the operating temperature value, this material can present molten condition, under the elastic force effect, core short circuit mutually, thus the signal that temperature arrives sent, be referred to as the melting insulating material.
The melting insulating material is done temperature-sensitive insulating material 27, core L3 and L4 elastic metallic material, its signal changes with the influence of length irrelevant, the ability of bearable environment temperature is good, analog quantity temperature sensing cable between core L1 and the L2 is subjected to mechanical presses and resisting breakage ability good, and the combination of two kinds of unlike signals is covered the shortage mutually, make the most of the advantage, effectively improve the line-type heat detector temperature grade of being failure to actuate.
The cable linear temperature sensing fire detector of embodiments of the invention four is made up of boxcar 1, temperature sensing cable 2 and termination box 3.As shown in Figure 4, except that core L1, L2 that parcel negative temperature coefficient megohmite insulant 21 is arranged, also be provided with the core L3, the L4 that are enclosed with temperature-sensitive insulating material 27 (as meltable material, CTR, PTC, NTC etc.) at temperature sensing cable 2.Can be parallel, stranded between core L1, core L2, core L3 and the core L4 or the dual mode combination place.To vary with temperature be an analog signals to insulation resistance between core L1 and the L2; Temperature-sensitive insulating material 27 is a switching value signal (meltable material) with variation of ambient temperature between core L3 and the L4, or a resistance variations analog signals related with environment temperature (CTR, PTC, NTC etc.).
Comparator circuit in the boxcar 1 obtains a signal that can reflect variation of ambient temperature by temperature-sensitive insulating material 27, core L3 and L4, this signal sends to single-chip microcomputer after comparator circuit is handled, thereby single-chip microcomputer is set fire alarm threshold X 1, X2 even X3 etc. under the varying environment temperature, judges fire condition according to the insulation resistance analog signals between core L1 and the L2 again.
Claims (10)
1. cable linear temperature sensing fire detector, comprise: interconnective boxcar and temperature sensing cable, be provided with core in the described temperature sensing cable, it is characterized in that, also comprise: be arranged on signal processor, the comparator circuit in the described boxcar and be arranged on first lead and second lead in the described temperature sensing cable, between described first lead and second lead, be provided with sensitive element; Described core, first lead and the second lead mutual insulating, wherein,
Sensitive element is used to experience the variation of environment temperature, and the temperature information of detected environment temperature is sent to described comparator circuit;
Comparator circuit is connected between core, first lead and second lead and the described signal processor, is used for described temperature information is changed into the discernible signal of described signal processor, and sends to described signal processor;
Signal processor is provided with alarm threshold value, and the described temperature information and the described alarm threshold value that receive are compared, the alert signal of transmitting messages when described temperature information surpasses described alarm threshold value.
2. line-type heat detector as claimed in claim 1 is characterized in that: described signal processor is a single-chip microcomputer.
3. cable linear temperature sensing fire detector as claimed in claim 1 is characterized in that: described sensitive element adopts temperature detect switch (TDS) combination, melting insulating material, positive temperature coefficient (PTC) insulating material, negative temperature coefficient insulating material or critical temperature temperature-sensitive insulating material.
4. cable linear temperature sensing fire detector as claimed in claim 3 is characterized in that: described temperature detect switch (TDS) combination comprises normally closed temperature detect switch (TDS) and the Chang Kai temperature detect switch (TDS) that is in series.
5. cable linear temperature sensing fire detector as claimed in claim 3 is characterized in that: described temperature detect switch (TDS) combination is adopted and is often driven temperature detect switch (TDS).
6. cable linear temperature sensing fire detector as claimed in claim 3 is characterized in that: described melting insulating material is coated in described first lead and the second lead outside.
7. cable linear temperature sensing fire detector as claimed in claim 1, it is characterized in that: also comprise privates, described privates respectively with described first lead and second wire insulation, often drive temperature detect switch (TDS) being respectively arranged with between described first lead and second wire insulation and between the privates and second wire insulation.
8. cable linear temperature sensing fire detector as claimed in claim 1 is characterized in that: described temperature information is switching value signal or the resistance variations analog signals related with environment temperature.
9. cable linear temperature sensing fire detector as claimed in claim 1 is characterized in that: described signal processor is provided with at least one alarm threshold value.
10. as each described cable linear temperature sensing fire detector of claim 1 to 9, it is characterized in that: described temperature sensing cable is connected with termination box.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010267916 CN101944264A (en) | 2010-08-31 | 2010-08-31 | Cable line type temperature-sensing fire detector |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010267916 CN101944264A (en) | 2010-08-31 | 2010-08-31 | Cable line type temperature-sensing fire detector |
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| CN 201010267916 Pending CN101944264A (en) | 2010-08-31 | 2010-08-31 | Cable line type temperature-sensing fire detector |
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