CN100504322C - Warning method for linear temperature sensitive detector - Google Patents
Warning method for linear temperature sensitive detector Download PDFInfo
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- CN100504322C CN100504322C CNB2007100574010A CN200710057401A CN100504322C CN 100504322 C CN100504322 C CN 100504322C CN B2007100574010 A CNB2007100574010 A CN B2007100574010A CN 200710057401 A CN200710057401 A CN 200710057401A CN 100504322 C CN100504322 C CN 100504322C
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Abstract
An alarming method of linear temperature sensing detector includes carrying out analysis on resistance or voltage value corresponding to a series of sampled valves in last period of current time, issuing fire alarm signal if these resistance or voltage values are gradually dropped down or rised up by said detector and issuing fault alarm by said detector if resistance or voltage values corresponding to sampled values are suddenly changed to be zero or to be maximum value.
Description
Technical field
The present invention relates to a kind of alarm method that is used for line-type heat detector, particularly relate to a kind of alarm method that is used for line-type heat detector that can under the situation of being rapidly heated, accurately send alerting signal.
Background technology
Line-type heat detector is a kind of widely used fire detector, mainly by linear temperature sensor, be connected an end of linear temperature sensor, can be in real time the temperature or the warning electrical quantity (or sampled value) of linear temperature sensor be detected, and the terminal resistance that sends the boxcar of alerting signal and be connected the linear temperature sensor other end according to the size of temperature or warning electrical quantity (or sampled value) constitutes.Fig. 1 is a kind of line-type heat detector structural representation of prior art.As shown in Figure 1, the line-type heat detector of this prior art is made of linear temperature sensor and the boxcar 7 and the terminal resistance 6 that are connected to the linear temperature sensor two ends; Wherein linear temperature sensor comprises two parallel detecting conductors that are provided with 1,2 and a parallel NTC or the CTR characteristic material layer 3 that is arranged between two detecting conductors 1,2.Fig. 2 is the line-type heat detector structural representation of another kind of prior art.As shown in Figure 2, the line-type heat detector of this prior art is made of linear temperature sensor and the boxcar 7 and the terminal resistance 6 that are connected to the linear temperature sensor two ends; Wherein linear temperature sensor comprises two parallel detecting conductors 1 that are provided with, 2 reach parallel two detecting conductors 1 that are arranged on, NTC between 2 or CTR characteristic material layer 3, a conductive layer 4 and a fused insulating layer 5, and in two detecting conductors 1,2 at least one be elastic wire.The alarm method that is used for above-mentioned two kinds of line-type heat detectors at present is: 1. work as boxcar 7 and detect two detecting conductors 1 of line-type heat detector, the resistance value R of the sampled value correspondence between 2 is during less than the resistance value Rd of alarming threshold value correspondence, and detector sends fire alarm signal; 2. when boxcar 7 detected in the line-type heat detector resistance value R ≈ 0 of the sampled value correspondence between two detecting conductors 1,2, detector sent the short trouble alerting signal.But, there is following point in above-mentioned this alarm method: when above-mentioned two kinds of line-type heat detector parts are heated fast, for example, when utilizing the local location of lighter calcination detector, at two detecting conductors 1, under 2 the stress, will be in contact with one another conducting (being short circuit) between the detecting conductor 1,2.In this process, 7 pairs of two detecting conductors 1 of boxcar, the resistance value R of the sampled value correspondence that detects between 2 changes very fast, but because the restriction in sampling period, be to have the non-sampling period between the adjacent double sampling, at this moment boxcar 7 will occur and not collect the sampled data of the resistance value R of sampled value correspondence less than the resistance value Rd of alarming threshold value correspondence, but collect the state of the resistance value R ≈ 0 of sampled value correspondence, thereby cause detector to produce the problem that to send fire alarm signal but send the short trouble alerting signal by mistake, will reduce the warning reliability of line-type heat detector like this.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of alarm method that is used for line-type heat detector that can improve the warning reliability.
In order to achieve the above object, the alarm method that is used for line-type heat detector provided by the invention comprises the following step that carries out in order:
1) boxcar detects with certain sampling period in real time to the electrical parameter values (resistance value R or magnitude of voltage U) of the sampled value correspondence between two detecting conductors in the line-type heat detector and continuous updated stored, and preserves all the time before now the stage of the electrical parameter values of a series of sampled value correspondences in a period of time;
2) to detect in the line-type heat detector resistance value R ≈ 0 or the magnitude of voltage U of the sampled value correspondence between two detecting conductors be the peaked stage a certain moment of boxcar;
3) boxcar is to from step 2) that resistance value R or magnitude of voltage U that begins the sampled value correspondence of storing the inherent for the previous period step 1) constantly analyzes, if by time or sampling sequencing, during descending gradually appears in the resistance value R of sampled value correspondence or rising gradually appears in magnitude of voltage U trend, detector sends fire alarm signal; If by time or sampling sequencing, the trend that descending does not gradually appear in the resistance value R of sampled value correspondence or rising does not gradually appear in magnitude of voltage U, but resistance value R directly sports 0 or magnitude of voltage U when sporting maximal value, and detector sends the stage of short trouble alerting signal.
Resistance value R is the decision method of downtrending gradually and is in the described step 3): the resistance value Rt1 of a series of sampled value correspondences of gathering in the described time period, Rt2, in, the resistance value Rt1 of twice different sampled value correspondence before and after occurring, Rt2, Rt2＜Rt1 wherein, t2〉t1, and Rt2 ≠ 0.
Because detector can be subjected to the interference of various factors when sampling, above-mentioned comparative approach by twice data sampling size still might cause wrong report fire alarm problem, when especially linear temperature sensor being carried out squeeze test, the possibility of wrong report fire alarm increases, therefore magnitude of voltage U is gradually that the decision method of ascendant trend further is: the resistance value Rt1 of a series of sampled value correspondences of gathering in the described step 3) in described time period T, Rt2, Rt3 ... in, the resistance value Rt1 of three different sampled value correspondences before and after occurring at least, Rt2, Rt3, wherein Rt1〉Rt2〉Rt3, t3〉t2〉t1, and Rt3 ≠ 0
Magnitude of voltage U is gradually that the decision method of ascendant trend is: a series of sampled value corresponding voltage value Ut1 that gather in the described step 3) in described time period T, Ut2, in, twice different sampled value corresponding voltage value Ut1 before and after occurring, Ut2, Ut1＜Ut2 wherein, t2〉t1, and Ut2 is not equal to maximal value.
Equally, because detector can be subjected to the interference of various factors when sampling, above-mentioned comparative approach by twice data sampling size still might cause wrong report fire alarm problem, when especially linear temperature sensor being carried out squeeze test, the possibility of wrong report fire alarm increases, therefore magnitude of voltage U is gradually that the decision method of ascendant trend further is: a series of sampled value corresponding voltage value Ut1 that gather in the described step 3) in described time period T, Ut2, Ut3 ... in, at least three different sampled value corresponding voltage value Ut1 before and after occurring, Ut2, Ut3, wherein Ut3〉Ut2〉Ut1, t3〉t2〉t1, and Ut3 is not equal to maximal value.
Time period T in the described step 1) chooses in 1s～30s scope,
The sampling period of boxcar is chosen in 0.1s～3s scope in the described step 1).
Voltage max is voltage (or electromotive force) value that at least one detecting conductor adopts the linear temperature sensor sampled value correspondence that boxcar detects under two detecting conductor direct short-circuit situations of thermocouple wire in the described step 3), and its size is rule of thumb or passes through calculating or experimental measurement and definite.
The alarm method that is used for line-type heat detector provided by the invention is when boxcar detects the resistance value R ≈ 0 of the sampled value correspondence between the detecting conductor or corresponding voltage value and is maximal value, resistance or magnitude of voltage to a series of sampled value correspondences in this moment previous time period are analyzed, if these resistance or magnitude of voltage change with the trend that descends gradually or rise gradually, detector will send fire alarm signal; And if the resistance of sampled value correspondence or magnitude of voltage are not to change with the trend that descends gradually or rise gradually, but directly sport 0 or maximal value, detector will carry out fault alarm, thereby can eliminate the false alarm problem that detector occurs under the situation of being heated fast, therefore can improve the reliability of line-type heat detector.
Description of drawings
Fig. 1 is a kind of line-type heat detector structural representation of prior art.
Fig. 2 is the line-type heat detector structural representation of another kind of prior art.
Embodiment
Below in conjunction with drawings and the specific embodiments the alarm method that is used for line-type heat detector provided by the invention is elaborated.
Embodiment 1:
The alarm method that is used for line-type heat detector provided by the invention is applicable to the line-type heat detector shown in Fig. 1.Described line-type heat detector is made of linear temperature sensor and the boxcar 7 and the terminal resistance 6 that are connected to the linear temperature sensor two ends; Wherein linear temperature sensor comprises two parallel detecting conductors that are provided with 1,2 and a parallel NTC or the CTR characteristic material layer 3 that is arranged between two detecting conductors 1,2.Wherein can adopt parallel, winding or coaxial manner setting between two detecting conductors 1,2.
The alarm method that is used for line-type heat detector provided by the invention also is applicable to the line-type heat detector shown in Fig. 2.Described line-type heat detector is made of linear temperature sensor and the boxcar 7 and the terminal resistance 6 that are connected to the linear temperature sensor two ends; Wherein linear temperature sensor comprises two parallel detecting conductors 1 that are provided with, 2 reach parallel two detecting conductors 1 that are arranged on, NTC between 2 or CTR characteristic material layer 3, a conductive layer 4 and a fused insulating layer 5, two detecting conductors 1 wherein, can adopt parallel, winding or coaxial manner setting between 2, and at least one is elastic wire.
The alarm method that is used for line-type heat detector provided by the invention comprises the following step that carries out in order:
1) two detecting conductors 1 in 7 pairs of line-type heat detectors of boxcar, the resistance value R of the sampled value correspondence between 2 detects in real time with certain sampling period and continuous updated stored, and preserve before now the resistance value Rt1 of a series of sampled value correspondences in a period of time T all the time, Rt2 ... the stage of (t2〉t1);
2) boxcar 7 a certain moment t detect in the line-type heat detector stage of the resistance value R ≈ 0 (t〉t2〉t1) of the sampled value correspondence between two detecting conductors 1,2;
3) 7 pairs of boxcars are from step 2) that constantly t begin the resistance value Rt1 of the sampled value correspondence of storing the inherent step 1) of T for the previous period, Rt2, analyze, if by time or sampling sequencing, when downward trend appearred gradually in the resistance value R of sampled value correspondence, detector sent fire alarm signal; If by time or sampling sequencing, downward trend does not gradually appear in the resistance value R of sampled value correspondence, but directly sports at 0 o'clock, detector sends the stage of short trouble alerting signal.
Time period T in the described step 1) chooses in 1s～30s scope, and the sampling period of boxcar is then chosen in 0.1s～3s scope.
Resistance value R is the decision method of downtrending gradually and is in the described step 3): the resistance value Rt1 of a series of sampled value correspondences of gathering in described time period T, Rt2, in, the resistance value Rt1 of twice different sampled value correspondence before and after occurring, Rt2, Rt2＜Rt1 wherein, t2〉t1, and Rt2 ≠ 0.
The decision method that resistance value R is downtrending gradually in the described step 3) also can be improved to: the resistance value Rt1 of a series of sampled value correspondences of gathering in described time period T, Rt2, Rt3, in, at least the resistance value Rt1 of three different sampled value correspondences before and after occurring, Rt2, Rt3, Rt1 wherein〉Rt2〉Rt3, t3〉t2〉t1, and Rt3 ≠ 0, this decision method is based on following reason: before detector does not carry out squeeze test, as shown in Figure 2, do not come in contact conducting between detecting conductor 1 and the conductive layer 4, the resistance value of the sampled value correspondence of boxcar 7 detections at this moment is Rt1; When linear temperature sensor is carried out squeeze test, need make detecting conductor 1 and conductive layer 4 come in contact conducting earlier, the resistance value of the sampled value correspondence of boxcar 7 detections this moment can diminish and be Rt2, i.e. Rt1〉and Rt2, t2〉t1; And then make between two detecting conductors 1,2 and come in contact conducting, the resistance value R ≈ 0 of the sampled value correspondence that detects of boxcar 7 at this moment.If the decision method that alarm method that provides according to present embodiment and above-mentioned resistance value R are downtrending gradually, promptly this moment Rt1 Rt2, t2〉t1, and Rt2 ≠ 0, and the resistance value Rt1 of the sampled value correspondence that boxcar 7 detects, Rt2 ... variation tendency be to descend gradually, detector will be judged as fire condition and mistake is sent fire alarm signal.If the improvement decision method that alarm method that provides according to present embodiment and resistance value R are downtrending gradually, though promptly this moment Rt1 Rt2, t2〉t1, and Rt2 ≠ 0, but boxcar 7 can't be determined the resistance value Rt1 of sampled value correspondence, Rt2 ... variation tendency whether for descending gradually, at this moment detector will send the short trouble alerting signal exactly; The resistance value Rt3 that only in time period T, occurs a sampled value correspondence at least, while Rt1〉Rt2〉Rt3, t3〉t2〉t1, and Rt3 ≠ 0, detector just can send fire alarm signal, so just can improve the warning reliability of line-type heat detector greatly.
Embodiment 2:
Present embodiment is the improvement on embodiment 1 basis: two detecting conductors 1 on the line-type heat detector of present embodiment, at least one is thermocouple wire in 2, thereby form a linear temperature sensor with thermocouple characteristic with another root, all the other ingredients are identical with embodiment 1 described line-type heat detector, at this moment, the value of the sampled value correspondence of 7 pairs of linear temperature sensors detections of boxcar is voltage (electromotive force) value.
The alarm method that is used for line-type heat detector that present embodiment provides comprises the following step that carries out in order:
1) two detecting conductors 1 in 7 pairs of line-type heat detectors of boxcar, sampled value corresponding voltage value U between 2 detects in real time with certain sampling period and continuous updated stored, and preserve before now a series of sampled value corresponding voltage value Ut1 in a period of time T all the time, Ut2 ... the stage of (t2〉t1);
2) boxcar 7 a certain moment t detect in the line-type heat detector stage that the sampled value corresponding voltage value U between two detecting conductors 1,2 is a maximal value (t〉t2〉t1);
3) 7 pairs of boxcars are from step 2) that constantly t begin the sampled value corresponding voltage value Ut1 that stores the inherent step 1) of T for the previous period, Ut2, analyze, if by time or sampling sequencing, when the trend of rising gradually appearred in sampled value corresponding voltage value U, detector sent fire alarm signal; If by time or sampling sequencing, the trend that rising does not gradually appear in sampled value corresponding voltage value U, but when directly sporting maximal value, detector sends the stage of short trouble alerting signal.
Time period T in the described step 1) chooses in 1s～30s scope, and the sampling period of boxcar is then chosen in 0.1s～3s scope.
Magnitude of voltage U is gradually that the decision method of ascendant trend is: a series of sampled value corresponding voltage value Ut1 that gather in the described step 3) in described time period T, Ut2, in, twice different sampled value corresponding voltage value Ut1 before and after occurring, Ut2, Ut1＜Ut2 wherein, t2〉t1, and Ut2 is not equal to maximal value.
Magnitude of voltage U is gradually that the decision method of ascendant trend also can be improved to: a series of sampled value corresponding voltage value Ut1 that gather in the described step 3) in described time period T, Ut2, Ut3, in, at least three different sampled value corresponding voltage value Ut1 before and after occurring, Ut2, Ut3, Ut3 wherein〉Ut2〉Ut1, t3〉t2〉t1, and Ut3 is not equal to maximal value, and this situation is based on following reason: before detector does not carry out squeeze test, do not come in contact conducting between detecting conductor 1 and the conductive layer 4, the sampled value corresponding voltage value of boxcar 7 detections at this moment is Ut1; When linear temperature sensor is carried out squeeze test, need make detecting conductor 1 and conductive layer 4 come in contact conducting earlier, this moment, the sampled value corresponding voltage value of boxcar 7 detections can become greatly Ut2, i.e. Ut2〉and Ut1, t2〉t1; And then make between two detecting conductors 1,2 and come in contact conducting, the sampled value corresponding voltage value U ≈ maximal value that detects of boxcar 7 at this moment; If the alarm method and the above-mentioned magnitude of voltage U that provide according to present embodiment are the decision method of ascendant trend gradually, promptly this moment Ut2 Ut1, t2〉t1, and Ut2 ≈ maximal value, and the sampled value corresponding voltage value Ut1 that boxcar 7 detects, Ut2 ... variation tendency be to rise gradually, detector will be judged as fire condition and mistake is sent fire alarm signal.If the alarm method and the magnitude of voltage U that provide according to present embodiment are the improvement decision method of ascendant trend gradually, though promptly this moment Ut2 Ut1, t2〉t1, and Ut2 ≈ maximal value, but boxcar 7 can't be determined sampled value corresponding voltage value Ut1, Ut2 ... variation tendency whether for rising gradually, at this moment detector will send the short trouble alerting signal exactly; A sampled value corresponding voltage value Ut3 only appears in time period T at least, while Ut3〉Ut2〉Ut1, t3〉t2〉t1, and Ut3 ≈ maximal value, detector just can send fire alarm signal, so just can improve the warning reliability of line-type heat detector greatly.
Voltage max in the present embodiment is that at least one detecting conductor adopts the linear temperature sensor of thermocouple wire at two detecting conductors 1, voltage (or electromotive force) value of the sampled value correspondence that boxcar 7 detects under the 2 direct short-circuit situations, its size are rule of thumb or through calculating or experimental measurement and definite.
Claims (8)
1, a kind of alarm method that is used for line-type heat detector is characterized in that: the described alarm method that is used for line-type heat detector comprises the following step that carries out in order:
1) boxcar (7) is to two detecting conductors (1 in the line-type heat detector, the electrical parameter values resistance value R of the sampled value correspondence 2) or magnitude of voltage U detect in real time with certain sampling period and continuous updated stored, and preserve all the time the stage of the electrical parameter values of a series of sampled value correspondences in a period of time before now;
2) to detect the resistance value R ≈ 0 or the magnitude of voltage U of the sampled value correspondence between two detecting conductors (1,2) in the line-type heat detector be the peaked stage to a certain moment t of boxcar (7);
3) boxcar (7) is to from step 2) that resistance value R or magnitude of voltage U that begins the sampled value correspondence of storing the inherent step 1) of T for the previous period constantly analyzes, if by time or sampling sequencing, during descending gradually appears in the resistance value R of sampled value correspondence or rising gradually appears in magnitude of voltage U trend, detector sends fire alarm signal; If by time or sampling sequencing, the trend that descending does not gradually appear in the resistance value R of sampled value correspondence or rising does not gradually appear in magnitude of voltage U, but resistance value R directly sports 0 or magnitude of voltage U when sporting maximal value, and detector sends the stage of short trouble alerting signal.
2, the alarm method that is used for line-type heat detector according to claim 1, it is characterized in that: resistance value R is the decision method of downtrending gradually and is in the described step 3): the resistance value Rt1 of a series of sampled value correspondences of gathering in described time period T, Rt2, in, the resistance value Rt1 of twice different sampled value correspondence before and after occurring, Rt2, wherein Rt2＜Rt1, t2〉t1, and Rt2 ≠ 0.
3, the alarm method that is used for line-type heat detector according to claim 1, it is characterized in that: resistance value R is the decision method of downtrending gradually and is in the described step 3): the resistance value Rt1 of a series of sampled value correspondences of gathering in described time period T, Rt2, Rt3, in, at least the resistance value Rt1 of three different sampled value correspondences before and after occurring, Rt2, Rt3, Rt1 wherein〉Rt2〉Rt3, t3〉t2〉t1, and Rt3 ≠ 0
4, the alarm method that is used for line-type heat detector according to claim 1, it is characterized in that: magnitude of voltage U is gradually that the decision method of ascendant trend is: a series of sampled value corresponding voltage value Ut1 that gather in the described step 3) in described time period T, Ut2, in, twice different sampled value corresponding voltage value Ut1 before and after occurring, Ut2, wherein Ut1＜Ut2, t2〉t1, and Ut2 is not equal to maximal value.
5, the alarm method that is used for line-type heat detector according to claim 1, it is characterized in that: magnitude of voltage U is gradually that the decision method of ascendant trend is: a series of sampled value corresponding voltage value Ut1 that gather in the described step 3) in described time period T, Ut2, Ut3 ... in, at least three different sampled value corresponding voltage value Ut1 before and after occurring, Ut2, Ut3, wherein Ut3〉Ut2〉Ut1, t3〉t2〉t1, and Ut3 is not equal to maximal value.
6, the alarm method that is used for line-type heat detector according to claim 1 is characterized in that: the time period T in the described step 1) chooses in 1s～30s scope
7, the alarm method that is used for line-type heat detector according to claim 1 is characterized in that: the sampling period of boxcar in the described step 1) (7) is chosen in 0.1s～3s scope.
8, the alarm method that is used for line-type heat detector according to claim 1, it is characterized in that: voltage max is that at least one detecting conductor adopts the linear temperature sensor of thermocouple wire at two detecting conductors (1 in the described step 3), the voltage or the potential value of the sampled value correspondence that boxcar under 2) the direct short-circuit situation (7) detects, its size are rule of thumb or through calculating or experimental measurement and definite.
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| CNB2007100574010A CN100504322C (en) | 2007-05-21 | 2007-05-21 | Warning method for linear temperature sensitive detector |
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| CNB2007100574010A CN100504322C (en) | 2007-05-21 | 2007-05-21 | Warning method for linear temperature sensitive detector |
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| CN102662103B (en) * | 2012-05-11 | 2014-07-02 | 成都安可信电子股份有限公司 | Method for preventing false alarms of alarm device |
| CN102992220B (en) * | 2012-12-14 | 2015-03-04 | 中联重科股份有限公司 | Method, device and system for synchronous control of winches, and multi-winch single-hook type crane |
| CN105809876B (en) * | 2016-05-06 | 2018-11-02 | 曾以若 | A kind of line type temperature-sensitive detection cable |
| CN110969797A (en) * | 2019-11-14 | 2020-04-07 | 中国航空工业集团公司西安航空计算技术研究所 | Aviation fire alarm monitoring method and circuit |
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