CN104376677A - High-sensitivity composite linear heat fire detector and alarming method thereof - Google Patents
High-sensitivity composite linear heat fire detector and alarming method thereof Download PDFInfo
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- CN104376677A CN104376677A CN201410748667.XA CN201410748667A CN104376677A CN 104376677 A CN104376677 A CN 104376677A CN 201410748667 A CN201410748667 A CN 201410748667A CN 104376677 A CN104376677 A CN 104376677A
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- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
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Abstract
The invention discloses a high-sensitivity composite linear heat fire detector. The high-sensitivity composite linear heat fire detector comprises a temperature-sensitive component, a signal processing unit and a terminal resistor, wherein the temperature-sensitive component comprises an analog quantity cable type linear temperature-sensitive cable and a plurality of temperature sensing modules; the temperature sensing modules are adjacent to one another and are connected to one another in parallel; the distance between each two temperature sensing modules is not greater than 1 meter; and the stability and the reliability of the detector are improved. Compared with a single multi-point cable type linear heat fire detector, the high-sensitivity composite linear heat fire detector has the characteristic that the sensitivity is improved greatly. Moreover, the invention provides an alarming method for the high-sensitivity composite linear heat fire detector. By the high-sensitivity composite linear heat fire detector and the alarming method thereof, fusion complementary of constant-temperature alarming and differential-temperature alarming is realized by multi-data fusion on the basis that a normal running state, a fire hazard state and a fault state are judged accurately, uninterrupted fire hazard detection is realized, and multi-level fire hazard detection and multi-level alarming functions are fulfilled further. The high-sensitivity composite linear heat fire detector has quite high practicality and is suitable to be popularized and used.
Description
Technical field
The invention belongs to fire detecting and alarm technical field in safety engineering discipline, be specifically related to a kind of composite line type temperature sensing fire detector and alarm method thereof.
Background technology
At present, the cable linear temperature sensing fire detector of prior art is widely used in industrial fire field.It mainly contains switching value cable linear temperature sensing fire detector, analog quantity cable linear temperature sensing fire detector, multipoint mode cable linear temperature sensing fire detector and distributed linear optical fiber heat fire detector.The said goods Problems existing in engineer applied is cannot use after switching value cable linear temperature sensing fire detector is reported to the police, analog quantity cable linear temperature sensing fire detector is subject to environment temperature and the impact of length of being heated, there is the detection blind area between 2 sensing points in multipoint mode cable linear temperature sensing fire detector, its sensitivity of distributed linear optical fiber heat fire detector is lower, and often probe unit length is 3m.
Due to the existence of the problems referred to above, greatly limit the range of application of the cable linear temperature sensing fire detector of prior art.
Summary of the invention
Goal of the invention: in order to overcome the deficiencies in the prior art, first object of the present invention is to provide a kind of highly sensitive composite line type temperature sensing fire detector, second object is to provide a kind of alarm method for highly sensitive composite line type temperature sensing fire detector, to improve the stability of detection, reliability and sensitivity, and the continuous fire detection of free of discontinuities and Multi-stage alarming can be realized.
Technical scheme: for solving the problems of the technologies described above, highly sensitive composite line type temperature sensing fire detector provided by the invention, comprises temperature sensing part, signal processing unit and terminal resistance;
Described temperature sensing part comprises the temperature sensing module of analog quantity cable linear temperature sensing cable and some parallel connections, and between the described temperature sensing module of placed adjacent, spacing is not more than 1 meter;
Described signal processing unit comprises arithmetic processing apparatus, and the first electric signal measurement device be connected with arithmetic processing apparatus, the second electric signal measurement device and alarm output device;
Described terminal resistance comprises the terminal resistance R1 be connected with the temperature sensing wired in parallel of multiple parallel connection, and the terminal resistance R2 be connected in parallel with analog quantity cable linear temperature sensing cable;
The line end of the some temperature sensing modules of described parallel connection is connected in parallel terminal resistance R1, and head end is connected with the first electric signal measurement device; The end of described analog quantity cable linear temperature sensing cable is connected in parallel terminal resistance R2, and head end is connected with the second electric signal measurement device.
Preferably, described arithmetic processing apparatus, the semaphore for recording according to the first electric signal measurement device and the second electric signal measurement device judges that detector is in normal operation or fire or malfunction; Simultaneously for when judging that detector is in fire or malfunction, starting alarm output device and carrying out fire alarm or fault alarm;
Described first electric signal measurement device is used for carrying out semaphore collection to the circuit that temperature sensing module and terminal resistance R1 are connected in parallel; Described second electric signal measurement device is used for carrying out semaphore collection to the circuit that analog quantity cable linear temperature sensing cable and terminal resistance R2 are connected in parallel.
Preferably, described temperature sensing module is that open type temperature switch is connected a thermistor Rt.
Preferably, described temperature sensing part comprises the first cable and the second cable, and described First Line cable wrap draws together outer field first insulating sheath, and in the first insulating sheath, some temperature sensing modules of being connected in parallel by the first metallic conductor; Described second cable is analog quantity cable linear temperature sensing cable, comprises two second metallic conductors in outer field second insulating sheath and the second insulating sheath, is coated with NTC characteristic barrier layer respectively outside described two second metallic conductors.Certainly other common temperature-sensitive elastomeric material can be also coated with outside described two second metallic conductors.
Preferably, described first cable is parallel with the second cable is close to or is equidistantly twisted into one.Preferably, described some temperature sensing modules are connected in parallel by first metallic conductor of more than two or two.Further preferred, described first cable and the second Wire/cable contact member are integrated and cover insulating sheath and form the total cable of single temperature-sensitive outward afterwards.
The alarm method for above-mentioned highly sensitive composite line type temperature sensing fire detector that the present invention provides simultaneously, comprises the steps:
The step of semaphore Real-time Collection: the collection of resistance value semaphore is carried out to the circuit that temperature sensing module and terminal resistance R1 are connected in parallel by the first electric signal measurement device; By the second electric signal measurement device, the collection of resistance value semaphore is carried out to the circuit that analog quantity cable linear temperature sensing cable and terminal resistance R2 are connected in parallel;
The step of calculation process: pass through arithmetic processing apparatus, calculation process is carried out to the semaphore that the first electric signal measurement device and the second electric signal measurement device record, judge the duty residing for detector, described duty comprises normal operating condition, fire condition and malfunction;
The step of reporting to the police: when the duty judging detector is fire condition, starts alarm output device and carries out fire alarm; When the duty of detector is malfunction, starts alarm output device and carry out fault alarm.
Preferably, the step of described calculation process, comprising:
The determining step of normal operating conditions: the resistance value collected when the first electric signal measurement device equals the resistance value of terminal resistance R1, and the resistance value that the second electric signal measurement device collects is when equaling the resistance value of terminal resistance R2, arithmetic processing apparatus judges that the duty of detector is normal operating conditions;
The step that malfunction judges: the resistance value collected when the first electric signal measurement device equals 0 or+∞, or when the resistance value that collects of the second electric signal measurement device equals 0 or+∞, arithmetic processing apparatus judges that the duty of detector is malfunction;
The step that fire condition judges, comprising:
When the resistance value that the first electric signal measurement device collects is less than the resistance value of terminal resistance R1, judge a pair resistance value that first, second electric signal measurement device collects, whether meet the corresponding threshold value be less than in preset alarm sets of threshold values, then arithmetic processing apparatus judges that the duty of detector is fire condition in this way simultaneously;
When the resistance value that the first electric signal measurement device collects equals the resistance value of terminal resistance R1, judge whether the rate of change of the resistance value that the second electric signal measurement device collects is greater than preset temperature rate of change threshold value, then arithmetic processing apparatus judges that the duty of detector is fire condition in this way.Under this conceptual design, the present invention can realize the unremitting continuous fire detection in arbitrfary point.
As preferred further, in the step that described fire condition judges: comprise preset alarm sets of threshold values more than two and plural preset temperature rate of change threshold value;
When the resistance value that the first electric signal measurement device collects is less than the resistance value of terminal resistance R1, for each group preset alarm sets of threshold values, judge a pair resistance value that first, second electric signal measurement device collects one by one, whether meet the corresponding threshold value be less than in this preset alarm sets of threshold values, then arithmetic processing apparatus judges that the duty of detector is the fire condition of this preset alarm sets of threshold values corresponding level in this way simultaneously;
When the resistance value that the first electric signal measurement device collects equals the resistance value of terminal resistance R1, for each preset temperature rate of change threshold value, judge whether the rate of change of the resistance value that the second electric signal measurement device collects is greater than this preset temperature rate of change threshold value, then arithmetic processing apparatus judges that the duty of detector is the fire condition of this preset temperature rate of change threshold value corresponding level in this way;
In the step of described warning: when judging that the duty of detector is the fire condition of this preset alarm sets of threshold values or this preset temperature rate of change threshold value corresponding level, start the fire alarm that alarm output device carries out this preset alarm sets of threshold values or this preset temperature rate of change threshold value corresponding level.
In this preferred scheme further, the Multi-stage alarming function for different stage can be realized.
Preferably, the temperature sensing module in described detector is that open type temperature switch is connected a thermistor Rt; In the step that described fire condition judges: comprise two groups of preset alarm sets of threshold values, be respectively (R1 (DW1), R2 (DW1)) and (R1 (DW2), R2 (DW2)); Described (R1 (DW1), R2 (DW1)) be corresponding alarm settings threshold value T(DW1) sets of threshold values corresponding to the resistance value that collects of first, second electric signal measurement device, described alarm settings threshold value T(DW1) be the closed threshold value of described temperature switch; Described (R1 (DW2), R2 (DW2)) be corresponding alarm settings threshold value T(DW2) sets of threshold values corresponding to the resistance value that collects of first, second electric signal measurement device, described alarm settings threshold value T(DW2) be greater than the closed threshold value of described temperature switch.In this preferred version, can realize closing threshold value for temperature switch and being greater than the two-stage warning that temperature switch closes threshold value.
Beneficial effect: highly sensitive composite line type temperature sensing fire detector provided by the invention, its temperature sensing part comprises the temperature sensing module be connected in parallel that analog quantity cable linear temperature sensing cable and some adjacent spacing are not more than 1 meter, improve the stability of detector, reliability, especially than single multipoint mode cable linear temperature sensing fire detector, sensitivity is greatly improved.
Highly sensitive composite line type temperature sensing fire detector provided by the invention and alarm method simultaneously, the numerical value of the resistance value semaphore that two groups of electric signal measurement devices are collected and rate of change thereof, contrast with the alarm threshold value group preset and preset temperature rate of change threshold value, the fusion that this detector constant temperature is reported to the police and differential temperature is reported to the police is achieved complementary by multi-data fusion, no matter be (when length of being heated is greater than the maximum spacing between adjacent parallel connection between temperature sensing module) when having large burning things which may cause a fire disaster to occur around temperature sensing part, or (length of being heated is less than the maximum spacing between adjacent parallel connection between temperature sensing module when having little burning things which may cause a fire disaster to occur around temperature sensing part, by thermal site time adjacent parallel connection between temperature sensing module time), fire alarm can be realized exactly, achieving normal operating condition, on the basis of the accurate judgement of fire condition and malfunction, achieve the continuous detection of free of discontinuities accurately.
Further, the present invention also by organizing the setting of preset alarm sets of threshold values and multiple preset temperature rate of change threshold value more and detecting judgement, realizes multistage detection and Multi-stage alarming function.
In general, highly sensitive composite line type temperature sensing fire detector provided by the invention and alarm method, there is higher stability, reliability and sensitivity, on the basis of accurate judgement achieving normal operating condition, fire condition and malfunction, the fusion that constant temperature is reported to the police and differential temperature is reported to the police is achieved complementary by multi-data fusion, achieve the continuous detection of free of discontinuities accurately, also can realize multistage detection and Multi-stage alarming function further, there is very high practicality, be suitable for applying.
Accompanying drawing explanation
Fig. 1 is the structural representation of highly sensitive composite line type temperature sensing fire detector provided by the invention;
Fig. 2 is the structural representation of temperature sensing module in Fig. 1;
Fig. 3 is the sectional structure schematic diagram of temperature sensing part in Fig. 1.
Embodiment
Fig. 3 is the structural representation that in Fig. 1, temperature sensing part is longitudinally analysed and observe, and is further described the present invention below in conjunction with drawings and Examples.
system embodiment 1:as shown in Figure 1, the highly sensitive composite line type temperature sensing fire detector that the present embodiment provides, comprises temperature sensing part, signal processing unit and terminal resistance;
Described temperature sensing part comprises the temperature sensing module of analog quantity cable linear temperature sensing cable and some parallel connections, between the described temperature sensing module of placed adjacent, spacing is not more than 1 meter, the maximum spacing D (max)≤1 meter between the temperature sensing module of being namely separated by arbitrarily between parallel connection;
Described signal processing unit comprises arithmetic processing apparatus, and the first electric signal measurement device be connected with arithmetic processing apparatus, the second electric signal measurement device and alarm output device;
Described terminal resistance comprises the terminal resistance R1 be connected with the temperature sensing wired in parallel of multiple parallel connection, and the terminal resistance R2 be connected in parallel with analog quantity cable linear temperature sensing cable;
The line end of some temperature sensing modules in parallel is connected in parallel terminal resistance R1, head end is connected with the first electric signal measurement device, and described first electric signal measurement device is used for carrying out semaphore collection to the circuit that temperature sensing module and terminal resistance R1 are connected in parallel; The end of analog quantity cable linear temperature sensing cable is connected in parallel terminal resistance R2, head end is connected with the second electric signal measurement device, and described second electric signal measurement device is used for carrying out semaphore collection to the circuit that analog quantity cable linear temperature sensing cable and terminal resistance R2 are connected in parallel.
Described arithmetic processing apparatus, the semaphore for recording according to the first electric signal measurement device and the second electric signal measurement device judges that detector is in normal operation or fire or malfunction; Simultaneously for when judging that detector is in fire or malfunction, starting alarm output device and carrying out fire alarm or fault alarm.
As shown in Figure 2, described temperature sensing module is that open type temperature switch is connected a thermistor Rt.
As shown in Figure 3, temperature sensing part described in the present embodiment comprises the first cable and the second cable, the cut-open view of the first cable provided from Fig. 3, First Line cable wrap draws together outer field first insulating sheath 4, and in the first insulating sheath 4, some temperature sensing modules 1 of being connected in parallel by two first metallic conductors 3; Described second cable is analog quantity cable linear temperature sensing cable 2, comprises two second metallic conductors in outer field second insulating sheath and the second insulating sheath, is coated with NTC characteristic barrier layer respectively outside described two second metallic conductors.Certainly other common temperature-sensitive elastomeric material can be also coated with outside described two second metallic conductors.
As seen from Figure 1, in the first cable, two first metallic conductor end parallel connections of multiple temperature sensing module in parallel access terminal resistance R1, and head end accesses in the first electric signal measurement device; Two second metallic conductor end parallel connections in second cable (analog quantity temperature sensing cable) access terminal resistance R2, and head end accesses in the second electric signal measurement device.Two groups of electric signal measurement devices carry out acquisition and processing to resistance value semaphore respectively, and send the data of collection to arithmetic processing apparatus, data analysis and calculating that arithmetic processing apparatus imports into two groups, normally run according to calculation process result, the judgement of fire, fault.When having fire alarm or fault alarm occurs, arithmetic processing apparatus starts alarm output device.
Described first electric signal measurement device comprises the first front end circuit, the first filtering circuit, the first amplifying circuit and the first A/D convertor circuit; The input end of this first front end circuit is connected with the first cable head end, and be connected with the first filtering circuit, the first amplifying circuit and the first A/D convertor circuit after the first front end circuit in turn, the output of this first A/D convertor circuit is connected with arithmetic processing apparatus.Described second electric signal measurement device comprises the second front end circuit, the second filtering circuit, the second amplifying circuit and the second A/D convertor circuit; The input end of this second front end circuit is connected with the second cable head end, and be connected with the second filtering circuit, the second amplifying circuit and the second A/D convertor circuit after the second front end circuit in turn, the output of this second A/D convertor circuit is connected with arithmetic processing apparatus.
Described first cable and the second cable can adopt parallel be close to or equidistantly stranded mode formed one.Or by two Wire/cable contact members are formed the total cable of single temperature-sensitive at outer setting insulating sheath again.Connection metal conductor between multiple temperature sensing modules of described parallel connection can arrange more than two or two as required.Some in literary composition is one or more.Between the described temperature sensing module of placed adjacent, spacing is not more than on the basis of 1 meter simultaneously, and the location gap between the multiple temperature sensing modules be connected in parallel can be arranged flexibly according to practical situations.
mode embodiment 2:
The alarm method for above-mentioned highly sensitive composite line type temperature sensing fire detector that this method embodiment 2 provides, comprises the steps:
The step of semaphore Real-time Collection: the collection of resistance value semaphore is carried out to the circuit that temperature sensing module and terminal resistance R1 are connected in parallel by the first electric signal measurement device; By the second electric signal measurement device, the collection of resistance value semaphore is carried out to the circuit that analog quantity cable linear temperature sensing cable and terminal resistance R2 are connected in parallel.
The step of calculation process: namely pass through arithmetic processing apparatus, calculation process is carried out to the semaphore that the first electric signal measurement device and the second electric signal measurement device record, judge the duty residing for detector, described duty comprises normal operating condition, fire condition and malfunction, specifically comprises:
The determining step of normal operating conditions: the resistance value collected when the first electric signal measurement device equals the resistance value of terminal resistance R1, and the resistance value that the second electric signal measurement device collects is when equaling the resistance value of terminal resistance R2, arithmetic processing apparatus judges that the duty of detector is normal operating conditions; Now run indicator flicker;
The step that malfunction judges: the resistance value collected when the first electric signal measurement device equals 0 or+∞, or when the resistance value that collects of the second electric signal measurement device equals 0 or+∞, arithmetic processing apparatus judges that the duty of detector is malfunction; 0 detect the resistance value determined for corresponding electric signal measurement device during riches all the way arbitrarily raw short circuit in temperature sensing part herein, also can be described as fault value A, + ∞ is riches all the way the arbitrarily raw open circuit in temperature sensing part herein, during the whole open circuit of especially a certain cable, corresponding electric signal measurement device detects the resistance value determined, and also can be described as fault value B;
The step that fire condition judges: this method embodiment 2 comprises one group of preset alarm sets of threshold values (R1 (DW1), R2 (DW1)) and preset temperature rate of change threshold value Δ R (CW); Described (R1 (DW1), R2 (DW1)) be corresponding alarm settings threshold value T(DW1) sets of threshold values corresponding to the resistance value that collects of first, second electric signal measurement device, described alarm settings threshold value T(DW1) be the closed threshold value of described temperature switch, when the temperature of the first cable perception reaches threshold value T (DW1) of temperature switch, temperature switch can close;
When the resistance value that the first electric signal measurement device collects is less than the resistance value of terminal resistance R1, judge first, a pair resistance value that second electric signal measurement device collects, whether meet simultaneously and be less than preset alarm sets of threshold values (R1 (DW1), R2 (DW1)) in corresponding threshold value, namely judge whether the resistance value that the first electric signal measurement device collects meets the R1 (DW1) preset in less-than operation treating apparatus, judge whether the resistance value that the second electric signal measurement device collects meets the R2 (DW1) preset in less-than operation treating apparatus simultaneously, as all satisfied, then arithmetic processing apparatus judges that the duty of detector is fire condition,
(also can be: when the resistance value of the resistance value that the first electric signal measurement device collects and terminal resistance R1 is in certain deviation range when the resistance value that the first electric signal measurement device collects equals the resistance value of terminal resistance R1, this deviation range can set flexibly according to actual conditions), judge whether the rate of change of the resistance value that the second electric signal measurement device collects is greater than preset temperature rate of change threshold value Δ R (CW), then arithmetic processing apparatus judges that the duty of detector is fire condition in this way.
The step of reporting to the police: when the duty judging detector is fire condition, starts alarm output device and carries out fire alarm, firewarning light flicker simultaneously; When the duty of detector is malfunction, starts alarm output device and carry out fault alarm; Simultaneous faults lamp glimmers.
mode embodiment 3:
The alarm method for above-mentioned highly sensitive composite line type temperature sensing fire detector that this method embodiment 3 provides, comprises the steps:
The step of semaphore Real-time Collection: the collection of resistance value semaphore is carried out to the circuit that temperature sensing module and terminal resistance R1 are connected in parallel by the first electric signal measurement device; By the second electric signal measurement device, the collection of resistance value semaphore is carried out to the circuit that analog quantity cable linear temperature sensing cable and terminal resistance R2 are connected in parallel.
The step of calculation process: namely pass through arithmetic processing apparatus, calculation process is carried out to the semaphore that the first electric signal measurement device and the second electric signal measurement device record, judge the duty residing for detector, described duty comprises normal operating condition, fire condition and malfunction, specifically comprises:
The determining step of normal operating conditions: the resistance value collected when the first electric signal measurement device equals the resistance value of terminal resistance R1, and the resistance value that the second electric signal measurement device collects is when equaling the resistance value of terminal resistance R2, arithmetic processing apparatus judges that the duty of detector is normal operating conditions; Now run indicator flicker;
The step that malfunction judges: the resistance value collected when the first electric signal measurement device equals 0 or+∞, or when the resistance value that collects of the second electric signal measurement device equals 0 or+∞, arithmetic processing apparatus judges that the duty of detector is malfunction; 0 detect the resistance value determined for corresponding electric signal measurement device during riches all the way arbitrarily raw short circuit in temperature sensing part herein, also can be described as fault value A, + ∞ is riches all the way the arbitrarily raw open circuit in temperature sensing part herein, during the whole open circuit of especially a certain cable, corresponding electric signal measurement device detects the resistance value determined, and also can be described as fault value B;
The step that fire condition judges: this method embodiment 3 comprises two groups of preset alarm sets of threshold values and preset temperature rate of change threshold value Δ R (CW);
Described two groups of preset alarm sets of threshold values, are respectively (R1 (DW1), R2 (DW1)) and (R1 (DW2), R2 (DW2)); Described (R1 (DW1), R2 (DW1)) be corresponding alarm settings threshold value T(DW1) sets of threshold values corresponding to the resistance value that collects of first, second electric signal measurement device, described alarm settings threshold value T(DW1) be the closed threshold value of described temperature switch, when the temperature of the first cable perception reaches threshold value T (DW1) of temperature switch, temperature switch can close; Described (R1 (DW2), R2 (DW2)) be corresponding alarm settings threshold value T(DW2) sets of threshold values corresponding to the resistance value that collects of first, second electric signal measurement device, described alarm settings threshold value T(DW2) be greater than the closed threshold value of described temperature switch;
When the resistance value that the first electric signal measurement device collects is less than the resistance value of terminal resistance R1, for each group preset alarm sets of threshold values, judge a pair resistance value that first, second electric signal measurement device collects one by one, whether meet the corresponding threshold value be less than in this preset alarm sets of threshold values, then arithmetic processing apparatus judges that the duty of detector is the fire condition of this preset alarm sets of threshold values corresponding level in this way simultaneously; That is:
For alarm settings threshold value T(DW1) corresponding preset alarm sets of threshold values (R1 (DW1), R2 (DW1)), when the resistance value that the first electric signal measurement device collects is less than the resistance value of terminal resistance R1, judge whether the resistance value that the first electric signal measurement device collects meets the R1 (DW1) preset in less-than operation treating apparatus, judge whether the resistance value that the second electric signal measurement device collects meets the R2 (DW1) preset in less-than operation treating apparatus simultaneously, as all satisfied, then arithmetic processing apparatus judges that the duty of detector is alarm settings threshold value T(DW1) fire condition of corresponding level, i.e. preset alarm sets of threshold values (R1 (DW1), R2 (DW1)) fire condition of corresponding level,
Equally, for alarm settings threshold value T(DW2) corresponding preset alarm sets of threshold values (R1 (DW2), R2 (DW2)), when the resistance value that the first electric signal measurement device collects is less than the resistance value of terminal resistance R1, judge whether the resistance value that the first electric signal measurement device collects meets the R1 (DW2) preset in less-than operation treating apparatus, judge whether the resistance value that the second electric signal measurement device collects meets the R2 (DW2) preset in less-than operation treating apparatus simultaneously, as all satisfied, then arithmetic processing apparatus judges that the duty of detector is alarm settings threshold value T(DW2) fire condition of corresponding level, i.e. preset alarm sets of threshold values (R1 (DW2), R2 (DW2)) fire condition of corresponding level,
(also can be: when the resistance value of the resistance value that the first electric signal measurement device collects and terminal resistance R1 is in certain deviation range when the resistance value that the first electric signal measurement device collects equals the resistance value of terminal resistance R1, this deviation range can set flexibly according to actual conditions), for this preset temperature rate of change threshold value Δ R (CW), judge whether the rate of change of the resistance value that the second electric signal measurement device collects is greater than this preset temperature rate of change threshold value Δ R (CW), then arithmetic processing apparatus judges the fire condition of the duty of detector as this preset temperature rate of change threshold value Δ R (CW) corresponding level in this way.
The step of reporting to the police: when judging that the duty of detector is the fire condition of this preset alarm sets of threshold values or this preset temperature rate of change threshold value corresponding level, start the fire alarm that alarm output device carries out this preset alarm sets of threshold values or this preset temperature rate of change threshold value corresponding level, firewarning light flicker simultaneously; When the duty of detector is malfunction, starts alarm output device and carry out fault alarm; Simultaneous faults lamp glimmers.
principle of work:
(1): after normal power supply, first electric signal measurement device of detector provided by the invention carries out signals collecting to the circuit that the multiple temperature sensing module of parallel connection and a terminal resistance R1 are connected in parallel, and the second electric signal measurement device is organized to analog quantity cable linear temperature sensing cable and another circuit that terminal resistance R2 is connected in parallel and carried out signals collecting.Because one group of signal is that multiple temperature sensing module is in parallel with terminal resistance R1; And another group signal is that analog quantity cable linear temperature sensing cable is in parallel with terminal resistance R2, and normal temperature counterdie analog quantity cable linear temperature sensing cable line-to-line resistance is high resistant.Therefore when two groups of electric signal measurement devices detect R1 resistance value and R2 resistance value respectively, arithmetic processing apparatus can judge that detector is in normal operating condition thus, now normal run indicator flicker.
(2): when riches all the way arbitrarily raw short circuit in temperature sensing part, the electric signal measurement device of its correspondence detects that now resistance value is 0, arithmetic processing apparatus can judge that now detector is in malfunction according to this, and alarm output device exports fault-signal, fault alarm is carried out in the flicker of simultaneous faults lamp.When riches all the way the arbitrarily raw open circuit in temperature sensing part, during the whole open circuit of especially a certain cable, the resistance value that the electric signal measurement device that this cable connects detects is+∞, arithmetic processing apparatus can judge that now detector is in malfunction according to this, now alarm output device exports fault-signal, and fault alarm is carried out in trouble light flicker.
(3): around temperature sensing part, having large burning things which may cause a fire disaster to occur, (length of being namely heated is greater than the maximum spacing between adjacent parallel connection between temperature sensing module, at least one temperature sensing module is had to be arranged in big fire source range) time, the resistance value semaphore that first, second electric signal measurement device collects will change.
When the temperature of temperature sensing module perception reaches alarm settings threshold value T(DW1) (i.e. the threshold value T (DW1) of temperature switch) time, temperature switch close.The resistance value semaphore that now the first electric signal measurement device collects is more than one thermistor Rt1 and the value in parallel of terminal resistance R1.The termination resistance value R1 detected under the resistance value of this parallel connection must be less than normal operating conditions.In the case, the alarm threshold value R1 (DW1) preset in this parallel connection value and arithmetic processing apparatus is compared; Meanwhile, the resistance value semaphore of the analog quantity cable linear temperature sensing cable that the second electric signal measurement device collects and the measuring circuit that terminal resistance R2 forms is T(DW1) corresponding to parallel resistance value, by same for this value with arithmetic processing apparatus in default alarm threshold value R2 (DW1) compare.Once both are less than the alarm threshold value (R1 (DW1) in corresponding arithmetic processing apparatus simultaneously, R2 (DW1)) time, arithmetic processing apparatus can judge that the current duty of detector is fire condition according to this, and export fire alarm by alarm output device, firewarning light flicker simultaneously.Therefore by above-mentioned judgement, the present invention can realize T(DW1) constant temperature fire report to the police.
As preset Multi-stage alarming setting threshold value, the alarm settings threshold value T (DW2) of threshold value T (DW1) is closed as being greater than temperature switch, when the temperature of temperature sensing module perception reaches alarm settings threshold value T(DW2) time, the resistance value semaphore that first electric signal measurement device collects is more than one thermistor Rt1 and the value in parallel of terminal resistance R1, the alarm threshold value R1 (DW2) preset is compared in this parallel connection value and arithmetic processing apparatus; Meanwhile, the resistance value semaphore of the measuring circuit that analog quantity cable linear temperature sensing cable shunt terminal resistance R2 that the second electric signal measurement device collects forms is T(DW2) corresponding to parallel resistance value, by same for this value with arithmetic processing apparatus in default alarm threshold value R2 (DW2) compare.Once both are less than the alarm threshold value (R1 (DW2) in corresponding arithmetic processing apparatus simultaneously, R2 (DW2)) time, arithmetic processing apparatus can judge that the current duty of detector is fire condition according to this, and export fire alarm by alarm output device, firewarning light flicker simultaneously.Therefore by above-mentioned judgement, the present invention can realize T(DW1) and two-stage constant temperature fire T(DW2) report to the police, certainly also as required, many groups can be arranged and are greater than T(DW1) alarm settings threshold value T(DWN), to realize required multistage constant temperature warning function.
(4): around temperature sensing part, having little burning things which may cause a fire disaster to occur, (length of being namely heated is less than the maximum spacing between adjacent parallel connection between temperature sensing module, by thermal site time adjacent parallel connection between temperature sensing module) time, because do not have temperature sensing module to be arranged in burning things which may cause a fire disaster, the resistance value semaphore that first electric signal measurement device collects is substantially unchanged, the termination resistance value R1 detected under still equaling normal operating conditions.And the parallel resistance value of the measuring circuit that the analog quantity cable linear temperature sensing cable shunt terminal resistance R2 that the second electric signal measurement device collects forms, will change along with the rising of temperature, compare by time rate temperature change threshold value Δ R (CW) that preset in speed that this parallel resistance value is changed and arithmetic processing apparatus, speed once the change of this parallel resistance value meets or exceeds Δ R (CW), arithmetic processing apparatus can judge that the current duty of detector is fire condition according to this, and export fire alarm by alarm output device, firewarning light flicker simultaneously.By above-mentioned judgement, the present invention can realize differential fire corresponding to Δ R (CW) and report to the police.What the method for being reported to the police by this differential fire and above-mentioned constant temperature fire were reported to the police complements each other, and the present invention can realize the unremitting continuous fire detection in arbitrfary point.Certainly also as required, many groups rate temperature change threshold value Δ R (CWN) can be preset, to realize required multistage differential temperature warning function.
(5): when in (three), (four), alarm output device carries out fire alarm, the duty that arithmetic processing apparatus can provide Current detector is simultaneously the fire alarm of which group preset alarm sets of threshold values or which preset temperature rate of change threshold value corresponding level, to carry out fire detection and alarm more accurately.
Above implementation column does not form restriction to the present invention, and relevant staff is in the scope not departing from the technology of the present invention thought, and the various change carried out and amendment, all drop in protection scope of the present invention.
Claims (10)
1. a highly sensitive composite line type temperature sensing fire detector, is characterized in that: comprise temperature sensing part, signal processing unit and terminal resistance;
Described temperature sensing part comprises the temperature sensing module of analog quantity cable linear temperature sensing cable and some parallel connections, and between the described temperature sensing module of placed adjacent, spacing is not more than 1 meter;
Described signal processing unit comprises arithmetic processing apparatus, and the first electric signal measurement device be connected with arithmetic processing apparatus, the second electric signal measurement device and alarm output device;
Described terminal resistance comprises the terminal resistance R1 be connected with the temperature sensing wired in parallel of multiple parallel connection, and the terminal resistance R2 be connected in parallel with analog quantity cable linear temperature sensing cable;
The line end of the some temperature sensing modules of described parallel connection is connected in parallel terminal resistance R1, and head end is connected with the first electric signal measurement device; The end of described analog quantity cable linear temperature sensing cable is connected in parallel terminal resistance R2, and head end is connected with the second electric signal measurement device.
2. highly sensitive composite line type temperature sensing fire detector according to claim 1, it is characterized in that: described arithmetic processing apparatus, the semaphore for recording according to the first electric signal measurement device and the second electric signal measurement device judges that detector is in normal operation or fire or malfunction; Simultaneously for when judging that detector is in fire or malfunction, starting alarm output device and carrying out fire alarm or fault alarm;
Described first electric signal measurement device is used for carrying out semaphore collection to the circuit that temperature sensing module and terminal resistance R1 are connected in parallel; Described second electric signal measurement device is used for carrying out semaphore collection to the circuit that analog quantity cable linear temperature sensing cable and terminal resistance R2 are connected in parallel.
3. highly sensitive composite line type temperature sensing fire detector according to claim 1, is characterized in that: described temperature sensing module is that open type temperature switch is connected a thermistor Rt.
4. highly sensitive composite line type temperature sensing fire detector according to claim 1, it is characterized in that: described temperature sensing part comprises the first cable and the second cable, described First Line cable wrap draws together outer field first insulating sheath, and in the first insulating sheath, some temperature sensing modules of being connected in parallel by the first metallic conductor; Described second cable is analog quantity cable linear temperature sensing cable, comprises two second metallic conductors in outer field second insulating sheath and the second insulating sheath, is coated with NTC characteristic barrier layer respectively outside described two second metallic conductors.
5. highly sensitive composite line type temperature sensing fire detector according to claim 4, is characterized in that: described first cable is parallel with the second cable to be close to or to be equidistantly twisted into one; Described some temperature sensing modules are connected in parallel by first metallic conductor of more than two or two.
6. highly sensitive composite line type temperature sensing fire detector according to claim 5, is characterized in that: described first cable and the second Wire/cable contact member are integrated and outer cover insulating sheath and form the total cable of single temperature-sensitive afterwards.
7., for the alarm method of the highly sensitive composite line type temperature sensing fire detector described in the arbitrary claim of claim 1 to 6, it is characterized in that comprising the steps:
The step of semaphore Real-time Collection: the collection of resistance value semaphore is carried out to the circuit that temperature sensing module and terminal resistance R1 are connected in parallel by the first electric signal measurement device; By the second electric signal measurement device, the collection of resistance value semaphore is carried out to the circuit that analog quantity cable linear temperature sensing cable and terminal resistance R2 are connected in parallel;
The step of calculation process: pass through arithmetic processing apparatus, calculation process is carried out to the semaphore that the first electric signal measurement device and the second electric signal measurement device record, judge the duty residing for detector, described duty comprises normal operating condition, fire condition and malfunction;
The step of reporting to the police: when the duty judging detector is fire condition, starts alarm output device and carries out fire alarm; When the duty of detector is malfunction, starts alarm output device and carry out fault alarm.
8. the alarm method for highly sensitive composite line type temperature sensing fire detector according to claim 7, is characterized in that: the step of described calculation process, comprising:
The determining step of normal operating conditions: the resistance value collected when the first electric signal measurement device equals the resistance value of terminal resistance R1, and the resistance value that the second electric signal measurement device collects is when equaling the resistance value of terminal resistance R2, arithmetic processing apparatus judges that the duty of detector is normal operating conditions;
The step that malfunction judges: the resistance value collected when the first electric signal measurement device equals 0 or+∞, or when the resistance value that collects of the second electric signal measurement device equals 0 or+∞, arithmetic processing apparatus judges that the duty of detector is malfunction;
The step that fire condition judges, comprising:
When the resistance value that the first electric signal measurement device collects is less than the resistance value of terminal resistance R1, judge a pair resistance value that first, second electric signal measurement device collects, whether meet the corresponding threshold value be less than in preset alarm sets of threshold values, then arithmetic processing apparatus judges that the duty of detector is fire condition in this way simultaneously;
When the resistance value that the first electric signal measurement device collects equals the resistance value of terminal resistance R1, judge whether the rate of change of the resistance value that the second electric signal measurement device collects is greater than preset temperature rate of change threshold value, then arithmetic processing apparatus judges that the duty of detector is fire condition in this way.
9. the alarm method for highly sensitive composite line type temperature sensing fire detector according to claim 8, is characterized in that:
In the step that described fire condition judges: comprise preset alarm sets of threshold values more than two and plural preset temperature rate of change threshold value;
When the resistance value that the first electric signal measurement device collects is less than the resistance value of terminal resistance R1, for each group preset alarm sets of threshold values, judge a pair resistance value that first, second electric signal measurement device collects one by one, whether meet the corresponding threshold value be less than in this preset alarm sets of threshold values, then arithmetic processing apparatus judges that the duty of detector is the fire condition of this preset alarm sets of threshold values corresponding level in this way simultaneously;
When the resistance value that the first electric signal measurement device collects equals the resistance value of terminal resistance R1, for each preset temperature rate of change threshold value, judge whether the rate of change of the resistance value that the second electric signal measurement device collects is greater than this preset temperature rate of change threshold value, then arithmetic processing apparatus judges that the duty of detector is the fire condition of this preset temperature rate of change threshold value corresponding level in this way;
In the step of described warning: when judging that the duty of detector is the fire condition of this preset alarm sets of threshold values or this preset temperature rate of change threshold value corresponding level, start the fire alarm that alarm output device carries out this preset alarm sets of threshold values or this preset temperature rate of change threshold value corresponding level.
10. the alarm method for highly sensitive composite line type temperature sensing fire detector according to claim 9, is characterized in that: the temperature sensing module in described detector is that open type temperature switch is connected a thermistor Rt; In the step that described fire condition judges: comprise two groups of preset alarm sets of threshold values, be respectively (R1 (DW1), R2 (DW1)) and (R1 (DW2), R2 (DW2));
Described (R1 (DW1), R2 (DW1)) be corresponding alarm settings threshold value T(DW1) sets of threshold values corresponding to the resistance value that collects of first, second electric signal measurement device, described alarm settings threshold value T(DW1) be the closed threshold value of described temperature switch; Described (R1 (DW2), R2 (DW2)) be corresponding alarm settings threshold value T(DW2) sets of threshold values corresponding to the resistance value that collects of first, second electric signal measurement device, described alarm settings threshold value T(DW2) be greater than the closed threshold value of described temperature switch.
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