CN102354429B - Multivariate combined-type linear temperature-sensing fire detector and implementation method - Google Patents

Multivariate combined-type linear temperature-sensing fire detector and implementation method Download PDF

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CN102354429B
CN102354429B CN201110296108.6A CN201110296108A CN102354429B CN 102354429 B CN102354429 B CN 102354429B CN 201110296108 A CN201110296108 A CN 201110296108A CN 102354429 B CN102354429 B CN 102354429B
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temperature
circuit
heart yearn
sensing
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CN201110296108.6A
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CN102354429A (en
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刘星
李艳庆
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无锡圣敏传感科技有限公司
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Abstract

Multivariate combined-type linear temperature-sensing fire detector, it comprises sensing unit and microprocessor; Described sensing unit adopts three core flat structures, and in sensing unit, three heart yearn head ends are connected with microprocessor connection terminal corresponding end; Microcontroller circuit is made up of front end circuit, filtering circuit, amplifying circuit, communication driving circuit, signaling control circuit, time code receiving circuit, host CPU processor, warning output control circuit, warning section display circuit.The implementation method of Multivariate combined-type linear temperature-sensing fire detector, comprise following treatment step: according to the temperature data of sensing unit Real-time Collection, compare with the fire burning data be stored in advance in host CPU, draw the state of temperature between institute surveillance zone, realize different constant temperature and report to the police and environment temperature adaptive equalization.

Description

Multivariate combined-type linear temperature-sensing fire detector and implementation method

Technical field

The invention belongs to fire detecting and alarm technical field in safety engineering discipline, relate to a kind of be mainly used in fire early detection and the bad environments places such as all kinds of long tunnel of industrial circle, travelling belt, large-scale workshop, warehouse, track traffic such as electric power, metallurgy, petrochemical industry, due to overheated, the naked light of various electric power facility, equipment or article burn the fire that causes occur before or the Initial Abnormal status monitoring Multivariate combined-type linear temperature-sensing fire detector of reporting to the police and its implementation.

Background technology

The line-type heat detector being applied in the maturation of the industrial circles such as electric power, metallurgy, petrochemical industry at present mainly contains 3 kinds: on-off value linear constant temperature fire detector, analog linetype temperature-fixing fire detecting device and analog linear different constant temperature fire detector.These 3 kinds of detectors all adopt temperature sensing material to be processed into cable; the structure of outer cladding sheath; detection mechanism is generally impedance variation principle; namely detector adopts the cable material with distinct temperature coefficient to make; when the environment temperature of detector protection changes; the impedance of cable changes, and testing circuit is according to the impedance variation of cable, and whether scene of judging has fire to occur.Although some line-type heat detectors realize two-parameter or measuring multiple parameters by the quantity increasing inner temperature-sensitive cable, its structure and detection mechanism do not have the change of essence.

Line-type heat detector is in current engineer applied; mainly there are the following problems: one is the restriction by structure and detection mechanism, and the radius of protection of a detector is limited, so limit the protection domain of detector; add engineering equipment cost, reduce engineer applied cost performance.Two is because application places is mostly strong electromagnetic place, line-type heat detector is subject to electromagnetic interference (EMI), in order to prevent false alarm, detector sensitivity is turned down, although analog linear different constant temperature fire detector has been installed in part place, simply shield differential temperature function sometimes, only retain constant temperature warning function, cause detector to realize early fire detection, delay best warning and fire fighting and rescue opportunity.Three is the Effect on Detecting in order to ensure line-type heat detector, and the early detection realizing fire is reported to the police, the mounting means that project installation adopts contact to lay, and the manner easily introduces electromagnetic interference (EMI), is also unfavorable for engineering maintenance and maintenance.Four is that the line-type heat detector used at present does not possess monitored area temperature and warning position Presentation Function, because which limit use length and the application places of detector.

Due to the existence of the problems referred to above, greatly limit the range of application of line-type heat detector, have impact on the early stage responding ability of fire of detector.

Summary of the invention

For the deficiency that current line-type heat detector exists, the invention provides a kind of low cost and there is Multivariate combined-type linear temperature-sensing fire detector and the implementation method of stronger anti-electromagnetic interference capability and incipient fire responding ability.

For realizing the object of the invention, the present invention adopts following technical proposals:

Multivariate combined-type linear temperature-sensing fire detector, it comprises sensing unit and microprocessor; Said sensing unit adopts three core flat structures, and in sensing unit, three heart yearn head ends are connected with microprocessor connection terminal corresponding end; Microcontroller circuit is made up of front end circuit, filtering circuit, amplifying circuit, communication driving circuit, signaling control circuit, time code receiving circuit, host CPU processor, warning output control circuit, warning section display circuit; Heart yearn 2 outputs signal and outputs to filtering circuit input end by front end circuit, and filtering circuit output signal is connected to host CPU input end through amplifying circuit; Heart yearn 1 outputs signal and exports back code receiving circuit to by communication driving circuit, return code receiving circuit and output signal to host CPU, the steering order of host CPU through signaling control circuit to the input of communication driving circuit, the output of communication driving circuit connects heart yearn 1, by heart yearn 1, the steering order of host CPU is sent to sensing module, realize the transmitted in both directions of data, heart yearn 3, as the data common port of heart yearn 1 and heart yearn 2, is connected directly to earth potential.

Said sensing unit, adopt three core flat structures, three heart yearns are conductor, be arranged in parallel, wherein fill the negative temperature coefficient insulating material to slowly change or fast-changing temperature can be responsive between heart yearn 2,3, temperature increases resistance and declines, and forms the sensing cable with sense of continuity temperature function; Between heart yearn 1,3, sensing module is set at a certain distance, sensing module is pressed on negative temperature coefficient insulating material, and connection terminal is welded with heart yearn 1,3, installation infrared temperature sensor on sensing module, can realize remote non-contact type temperature measurement.The additional water-proof jacket of three heart yearns.

Said sensing unit, also four-core flat structure can be adopted, quad is conductor, be arranged in parallel, wherein heart yearn 1,2,3 and the heart yearn 1 in three core flat structures, 2,3 identical, heart yearn 4 is parallel to heart yearn 3 and arranges, and role is consistent with the effect of heart yearn 3, only as data communication line, form order circuit.

Because namely sensing unit comprises the sensing cable with sense of continuity temperature function, comprise again the sensing module of highly sensitive remote temperature sensing function, namely line formula temperature-sensitive and point type temperature-sensitive combine, so heart yearn can export analog quantity and digital quantity two kinds of temperature informations simultaneously, heart yearn 2,3 exports as analog quantity temperature information, and heart yearn 1,3 exports as digital quantity temperature information.

Sensing module is by level-conversion circuit, signal decoding circuit, response control circuit, infrared temperature sensor, semiconductor temperature sensor, channel selection circuit, signal amplification circuit, form from CPU processor.The output signal of heart yearn 1,3 exports signal decoding circuit to through level-conversion circuit, signal decoding circuit outputs signal to from CPU input end, level-conversion circuit is exported to through response control circuit from the answer information of CPU, level-conversion circuit output signal to heart yearn 1,3, realize and the bidirectional data transfers of microprocessor.The output of infrared temperature sensor is connected to the input of channel selection circuit, and the output of channel selection circuit is connected to the input of signal amplification circuit, and the output of signal amplification circuit is connected to the input from CPU.Control output from the channel selecting of CPU and be connected to channel selection circuit, realize the signals collecting to two kinds of different temperatures sensors.

Warning section display circuit is made up of LED charactron or LCD liquid crystal display, can displays temperature and alarm set point (i.e. sensing module address) position; Warning output control circuit comprises optocoupler and relay, and CPU exports control signal and is connected to relay by optocoupler, and relay output end is connected to remote control equipment, realizes the isolated controlling exported of reporting to the police.

The communication succession adopted between microprocessor and sensing module illustrates: microprocessor adopts the mode signaling of width modulation.Send out 12 information when patrolling and examining sensing module altogether, signaling order is 4, pattern position, address bit 8, and pattern position and address bit all first send out low level, and rear high-order.After powering on, microprocessor patrols and examines sensing module from 1 to 255 order, and midfeather certain hour is bus charging.Sensing module adopts and draws current system to answer information, and answer information is digital quantity, first answers low level during answer, and rear answer is high-order.The advantage of this communications protocol is that data communication line has stronger power supply capacity, while carrying out data communication, provides certain power supply energy by level-conversion circuit for sensing module, utilizes two lines bus just can realize data communication and power supply.Dormant state is in during sensing module flat from CPU, be waken up when carrying out data communication, start receiving mode position and address bit, after the address bit received and the machine address coincide, the machine address date is answered in the answer stage of communication succession, the temperature data being about to obtain postbacks to microprocessor by bus, communication is complete, the temperature data of infrared temperature sensor and semiconductor temperature sensor is gathered from CPU, be that data communication is prepared after process next time, then reenter dormant state.Due to from the time-sharing work of CPU and dormancy working method, the power consumption of sensing module is effectively reduced, substantially increases the load capacity of microprocessor, the quantity of sensing module can reach 255.

Multivariate combined-type linear temperature-sensing fire detector implementation method comprises following treatment step: according to the temperature data of sensing unit Real-time Collection, compare with the fire burning data be stored in advance in host CPU, draw the state of temperature between institute surveillance zone, realize different constant temperature and report to the police and environment temperature adaptive equalization.

Different constant temperature is reported to the police and the realization of environment temperature adaptive equalization comprises the steps:

First the analog input signal of heart yearn 2,3 in sensing unit is obtained, record temperature initial value C0, obtain the digital output signal of the sensing module connected between heart yearn 1,3, No. 1 address record temperature initial value B10, No. 2 address record temperature initial value B20, No. 3 address record temperature initial value B30, by that analogy, m address record temperature initial value Bm0 (m≤255), and record current running time T 0;

After microprocessor enters normal monitoring state, the data-signal that Real-time Collection two kinds is different, record current temperature value Cn, B1n-Bmn, Tn, calculate the temperature difference Δ C=Cn-C0 of heart yearn 2,3 current temperature value and initial value, the temperature difference Δ Bm=Bmn-Bm0 (m is 1-255) of current temperature value that the sensing module of all addresses gathers and initial value, working time differ from the rate of temperature change Δ C/ Δ T between Δ T=Tn-T0, heart yearn 2,3, the rate of temperature change Δ Bm/ Δ T (m is 1-255) of the sensing module of all addresses;

Be stored in advance in fire burning data A, D in host CPU, Δ A, Δ D are relevant with temperature sensing medium, obtain by fire combustion curve, wherein A, D are two temperature constants, Δ A, Δ D are two temperature variations, fire combustion curve is the data that the one group of temperature and time gathered in standard fire combustor test and in-site modeling natural fire generating process is correlated with, the horizontal ordinate of this curve is the time, and ordinate is temperature.

When meeting Δ C/ Δ T >=Δ D or meeting Δ Bm/ Δ T >=Δ A, carry out differential temperature warning, start alarm lamp and relay, simultaneously according to the address information of sensing module, display alarm zone field.

When meeting Δ C >=D or meeting Δ Bm >=A, carry out constant temperature warning, start alarm lamp and relay, simultaneously according to the address information of sensing module, display alarm zone field.

When above-mentioned two alert if all do not meet, replace C0 with Cn, replace Bm0 (m is 1-255) with Bmn, carry out environment temperature adaptive equalization.

The present invention is beneficial effect and advantage compared with prior art:

1, in fire detector of the present invention, sensing unit adopts two kinds of diverse temperature detection modes of mechanism, line formula temperature-sensitive and point type temperature-sensitive combine, be polynary line-type heat detector truly, greatly can improve the warning accuracy of line-type heat detector.

2, present invention preserves the characteristic of the continuous temperature-sensitive of line type fire detector, add infrared temperature sensor simultaneously, so remote non-contact measurement can be realized, make line-type heat detector work in higher grade of sensitivity, improve the incipient fire responding ability of line-type heat detector.

3, line-type heat detector of the present invention can adopt contactless mounting means; effectively can avoid electromagnetic interference (EMI); the protected area of detector is expanded while reducing rate of false alarm; improve the engineering adaptability of detector; compare with existing fire detector, engineering equipment cost can reduce by more than 50%.

4, line-type heat detector has warning position Presentation Function, therefore improves the use length of detector, can expand products application place.

Accompanying drawing explanation

Fig. 1 sensing unit structural drawing 1;

Fig. 2 sensing unit structural drawing 2;

Fig. 3 microprocessor function figure;

Fig. 4 line-type heat detector pie graph;

Fig. 5 sensing module pie graph;

Fig. 6 communication succession figure;

Fig. 7 software flowing chart.

Embodiment

Below in conjunction with drawings and Examples, the present invention is described in further detail:

See accompanying drawing 4, Multivariate combined-type linear temperature-sensing fire detector, it comprises sensing unit and microprocessor; Said sensing unit adopts three core flat structures, three heart yearns 1,2 in sensing unit, 3 head ends and microprocessor connection terminal A1, A2, and A3 corresponding end connects; Microcontroller circuit is made up of front end circuit, filtering circuit, amplifying circuit, communication driving circuit, signaling control circuit, time code receiving circuit, host CPU processor, warning output control circuit, warning section display circuit; Heart yearn 2 outputs signal and outputs to filtering circuit input end by front end circuit, and filtering circuit output signal is connected to host CPU input end through amplifying circuit; Heart yearn 1 outputs signal and exports back code receiving circuit to by communication driving circuit, return code receiving circuit and output signal to host CPU, the steering order of host CPU through signaling control circuit to the input of communication driving circuit, the output of communication driving circuit connects heart yearn 1, by heart yearn 1, the steering order of host CPU is sent to sensing module, realize the transmitted in both directions of data, heart yearn 3, as the data common port of heart yearn 1 and heart yearn 2, is connected directly to earth potential.

Sensing unit perception long distance areas continuous temperature change information, microcontroller acquires, process and analysis temperature information, and determine whether to report to the police according to data results.

Said sensing unit, adopt three core flat structures, three heart yearns are conductor, be arranged in parallel.Specifically see accompanying drawing 1.Wherein fill negative temperature coefficient insulating material 8 between heart yearn 2,3, form the cable with sense of continuity temperature function; Between heart yearn 1,3, sensing module 6 is set at a certain distance, sensing module is pressed on negative temperature coefficient insulating material, and is welded with heart yearn 1,3 by connection terminal, and solder joint is 7, installation infrared temperature sensor on sensing module, can realize non-contact type temperature measurement.The additional water-proof jacket 5 of three heart yearns.Spacing between sensing module 6 is 1-8 rice, and quantity mostly is 255 most, and therefore sensing unit is the longest reaches 2Km.

Said sensing unit, also can adopt four-core flat structure, quad is conductor, be arranged in parallel.Specifically see accompanying drawing 2.Wherein fill negative temperature coefficient insulating material 8 between heart yearn 2,3, form the cable with sense of continuity temperature function; Between heart yearn 1,4, sensing module 6 is set at a certain distance, sensing module is pressed on negative temperature coefficient insulating material, and is welded with heart yearn 1,4 by connection terminal, and solder joint is 7, installation infrared temperature sensor on sensing module, can realize non-contact type temperature measurement.The additional water-proof jacket 5 of quad.Spacing between sensing module 6 is 1-8 rice, and quantity mostly is 255 most, and therefore sensing unit is the longest reaches 2Km.

Because namely sensing unit comprises the cable with sense of continuity temperature function, comprise again the sensing module of highly sensitive remote temperature sensing function, namely line formula temperature-sensitive and point type temperature-sensitive combine, so heart yearn can export analog quantity and digital quantity two kinds of temperature informations simultaneously, heart yearn 2,3 exports as analog quantity temperature information, and heart yearn 1,3 exports as digital quantity temperature information.

Terminal B1, B3 of sensing module connect with heart yearn 1,3 respectively.Sensing module is by level-conversion circuit, signal decoding circuit, response control circuit, infrared temperature sensor, semiconductor temperature sensor, channel selection circuit, signal amplification circuit, form from CPU processor.The output signal of heart yearn 1,3 exports signal decoding circuit to through level-conversion circuit, signal decoding circuit outputs signal to from CPU input end, level-conversion circuit is exported to through response control circuit from the answer information of CPU, level-conversion circuit output signal to heart yearn 1,3, realize and the bidirectional data transfers of microprocessor.The output of infrared temperature sensor is connected to the input of channel selection circuit, and the output of channel selection circuit is connected to the input of signal amplification circuit, and the output of signal amplification circuit is connected to the input from CPU.Control output from the channel selecting of CPU and be connected to channel selection circuit, realize the signals collecting to two kinds of different temperatures sensors.

See accompanying drawing 3, microcontroller circuit is made up of front end circuit, filtering circuit, amplifying circuit, communication driving circuit, signaling control circuit, time code receiving circuit, host CPU processor, warning output control circuit, warning section display circuit; Heart yearn 2 outputs signal and outputs to filtering circuit input end by front end circuit, and filtering circuit output signal is connected to host CPU input end through amplifying circuit; Heart yearn 1 outputs signal and exports back code receiving circuit to by communication driving circuit, return code receiving circuit and output signal to host CPU, the steering order of host CPU through signaling control circuit to the input of communication driving circuit, the output of communication driving circuit connects heart yearn 1, by heart yearn 1, the steering order of host CPU is sent to sensing module, realize the transmitted in both directions of data, heart yearn 3, as the data common port of heart yearn 1 and heart yearn 2, is connected directly to earth potential.

See accompanying drawing 4, in sensing unit, heart yearn 2,3 head end connects microprocessor connection terminal A2, A3, and tail end connects terminal resistance R, and heart yearn 1 head end connects microprocessor terminal A1, and tail end is unsettled.Heart yearn 2 outputs signal and outputs to filtering circuit input end by front end circuit, and filtering circuit output signal is connected to host CPU input end through amplifying circuit; Heart yearn 1 outputs signal and exports back code receiving circuit to by communication driving circuit, return code receiving circuit and output signal to host CPU, the steering order of host CPU through signaling control circuit to the input of communication driving circuit, the output of communication driving circuit connects heart yearn 1, by heart yearn 1, the steering order of host CPU is sent to sensing module, realize the transmitted in both directions of data, heart yearn 3, as the data common port of heart yearn 1 and heart yearn 2, is connected directly to earth potential.

Said sensing module, see accompanying drawing 5.Sensing module is by level-conversion circuit, signal decoding circuit, response control circuit, infrared temperature sensor, semiconductor temperature sensor, channel selection circuit, signal amplification circuit, form from CPU processor.The output signal of heart yearn 1,3 exports signal decoding circuit to through level-conversion circuit, signal decoding circuit outputs signal to from CPU input end, level-conversion circuit is exported to through response control circuit from the answer information of CPU, level-conversion circuit output signal to heart yearn 1,3, realize and the bidirectional data transfers of microprocessor.The output of infrared temperature sensor is connected to the input of channel selection circuit, and the output of channel selection circuit is connected to the input of signal amplification circuit, and the output of signal amplification circuit is connected to the input from CPU.Control output from the channel selecting of CPU and be connected to channel selection circuit, realize the signals collecting to two kinds of different temperatures sensors.

Warning section display circuit is made up of LED charactron or LCD liquid crystal display, can displays temperature and alarm set point (i.e. sensing module address) position; Warning output control circuit comprises optocoupler and relay, and CPU exports control signal and is connected to relay by optocoupler, and relay output end is connected to remote control equipment, realizes the isolated controlling exported of reporting to the police.

See accompanying drawing 6, the communication succession adopted between microprocessor and sensing module illustrates: microprocessor adopts the mode signaling of width modulation.Send out 12 information when patrolling and examining sensing module altogether, signaling order is 4, pattern position, address bit 8, and pattern position and address bit all first send out low level, and rear high-order.After powering on, microprocessor patrols and examines sensing module from 1 to 255 order, and midfeather certain hour is bus charging.Sensing module adopts and draws current system to answer information, and answer information is digital quantity, first answers low level during answer, and rear answer is high-order.The advantage of this communications protocol is that data communication line has stronger power supply capacity, while carrying out data communication, provides certain power supply energy by level-conversion circuit for sensing module, utilizes two lines bus just can realize data communication and sensing module is powered.Dormant state is in during sensing module flat from CPU, be waken up when carrying out data communication, start receiving mode position and address bit, after the address bit received and the machine address coincide, the machine address date is answered in the answer stage of communication succession, the temperature data being about to obtain postbacks to microprocessor by bus, communication is complete, the temperature data of infrared temperature sensor and semiconductor temperature sensor is gathered from CPU, be that data communication is prepared after process next time, then reenter dormant state.Due to from the time-sharing work of CPU and dormancy working method, the power consumption of sensing module is effectively reduced, substantially increases the load capacity of microprocessor, the quantity of sensing module can reach 255.

See accompanying drawing 7, Multivariate combined-type linear temperature-sensing fire detector implementation method, the method is according to the temperature data of sensing unit Real-time Collection, compare with the fire burning data be stored in advance in host CPU, draw the state of temperature between institute surveillance zone, realize different constant temperature and report to the police and environment temperature adaptive equalization.

Different constant temperature is reported to the police and the realization of environment temperature adaptive equalization comprises the steps:

First the analog input signal of heart yearn 2,3 in sensing unit is obtained, record temperature initial value C0, obtain the digital output signal of the sensing module connected between heart yearn 1,3, No. 1 address record temperature initial value B10, No. 2 address record temperature initial value B20, No. 3 address record temperature initial value B30, the like, m address record temperature initial value Bm0 (m≤255), and record current running time T 0;

After microprocessor enters normal monitoring state, the data-signal that Real-time Collection two kinds is different, record current temperature value Cn, B1n-Bmn, Tn, calculate the temperature difference Δ C=Cn-C0 of heart yearn 2,3 current temperature value and initial value, the temperature difference Δ Bm=Bmn-Bm0 (m is 1-255) of current temperature value that the sensing module of all addresses gathers and initial value, working time differ from the rate of temperature change Δ C/ Δ T between Δ T=Tn-T0, heart yearn 2,3, the rate of temperature change Δ Bm/ Δ T (m is 1-255) of the sensing module of all addresses;

Be stored in advance in fire burning data A, D in host CPU, Δ A, Δ D are relevant with temperature sensing medium, obtain by fire combustion curve, wherein A, D are two temperature constants, Δ A, Δ D are two temperature variations, fire combustion curve is the data that the one group of temperature and time gathered in standard fire combustor test and in-site modeling natural fire generating process is correlated with, the horizontal ordinate of this curve is the time, and ordinate is temperature.

When meeting Δ C/ Δ T >=Δ D or meeting Δ Bm/ Δ T >=Δ A, carry out differential temperature warning, start alarm lamp and relay, simultaneously according to the address information of sensing module, display alarm zone field.

When meeting Δ C >=D or meeting Δ Bm >=A, carry out constant temperature warning, start alarm lamp and relay, simultaneously according to the address information of sensing module, display alarm zone field.

When above-mentioned two alert if all do not meet, replace C0 with Cn, replace Bm0 (m is 1-255) with Bmn, carry out environment temperature adaptive equalization.

Specific works principle: when the nearby region local temperature that line-type heat detector is monitored occurs abnormal, the impedance of the negative temperature coefficient insulating material between sensing unit heart yearn 2,3 changes, microprocessor, according to impedance variation situation, can judge the whether breaking out of fire of detector institute monitor area.The temperature data of simultaneously part sensing module monitoring also changes, and microprocessor also can monitor region whether breaking out of fire according to this change, indicates abnormal position (i.e. sensing module address) simultaneously.When the remote region local temperature that line-type heat detector is monitored occurs abnormal, the impedance variation of the negative temperature coefficient insulating material between sensing unit heart yearn 2,3 is not obvious, but the temperature data change of sensing module monitoring obviously, microprocessor can monitor rapidly the whether breaking out of fire of remote region according to this change, indicates simultaneously and indicates abnormal position (i.e. sensing module address) simultaneously.When residing for detector, environment temperature changes, the impedance of the negative temperature coefficient insulating material between sensing unit heart yearn 2,3 can change, can be there is consistent change in the temperature data of all sensing module monitorings simultaneously, so it is because variation of ambient temperature causes that the data that microprocessor unanimously can change according to this judge that temperature data occurs abnormal, these data is not processed or carries out ambient temperature compensation.Owing to achieving the remote non-contact temperature detection of multiple combined type truly; therefore improve the incipient fire responding ability of detector; greatly reduce the rate of false alarm of detector, add the protected area of detector, enhance the engineering adaptability of line-type heat detector.

Claims (8)

1. Multivariate combined-type linear temperature-sensing fire detector, it comprises sensing unit and microprocessor; Described sensing unit adopts three core flat structures, and in sensing unit, three heart yearn head ends are connected with microprocessor connection terminal corresponding end; Microcontroller circuit is made up of front end circuit, filtering circuit, amplifying circuit, communication driving circuit, signaling control circuit, time code receiving circuit, host CPU processor, warning output control circuit, warning section display circuit; Heart yearn 2 outputs signal and outputs to filtering circuit input end by front end circuit, and filtering circuit output signal is connected to host CPU input end through amplifying circuit; Heart yearn 1 outputs signal and exports back code receiving circuit to by communication driving circuit, return code receiving circuit and output signal to host CPU, the steering order of host CPU through signaling control circuit to the input of communication driving circuit, the output of communication driving circuit connects heart yearn 1, by heart yearn 1, the steering order of host CPU is sent to sensing module, sensing module is contained in sensing unit, realizes the transmitted in both directions of data, heart yearn 3, as the data common port of heart yearn 1 and heart yearn 2, is connected directly to earth potential;
The implementation method of Multivariate combined-type linear temperature-sensing fire detector, comprise following treatment step: according to the temperature data of sensing unit Real-time Collection, compare with the fire burning data be stored in advance in host CPU, draw the state of temperature between institute surveillance zone, realize different constant temperature and report to the police and environment temperature adaptive equalization;
Described different constant temperature is reported to the police and the realization of environment temperature adaptive equalization comprises the steps:
First the analog input signal of heart yearn 2,3 in sensing unit is obtained, record temperature initial value C0, obtain the digital output signal of the sensing module connected between heart yearn 1,3, No. 1 address record temperature initial value B10, No. 2 address record temperature initial value B20, No. 3 address record temperature initial value B30, the like, m address record temperature initial value Bm0, m≤255, and record current running time T 0;
After microprocessor enters normal monitoring state, the data-signal that Real-time Collection two kinds is different, record current temperature value Cn, Bln-Bmn, Tn, calculate the temperature difference Δ C=Cn-C0 of heart yearn 2,3 current temperature value and initial value, the temperature difference Δ Bm=Bmn-Bm0 of current temperature value that the sensing module of all addresses gathers and initial value, m is 1-255, working time differs from the rate of temperature change Δ C/ Δ T between Δ T=Tn-T0, heart yearn 2,3, the rate of temperature change Δ Bm/ Δ T of the sensing module of all addresses, and m is 1-255;
Be stored in advance in fire burning data A, D in host CPU, Δ A, Δ D are relevant with temperature sensing medium, obtain by fire combustion curve, wherein A, D are two temperature constants, Δ A, Δ D are two temperature variations, fire combustion curve is the data that the one group of temperature and time gathered in standard fire combustor test and in-site modeling natural fire generating process is correlated with, the horizontal ordinate of this curve is the time, and ordinate is temperature;
When meeting Δ C/ Δ T >=Δ D or meeting Δ Bm/ Δ T >=Δ A, carry out differential temperature warning, start alarm lamp and relay, simultaneously according to the address information of sensing module, display alarm zone field;
When meeting Δ C >=D or meeting Δ Bm >=A, carry out constant temperature warning, start alarm lamp and relay, simultaneously according to the address information of sensing module, display alarm zone field;
When above-mentioned two alert if all do not meet, replace C0 with Cn, replace Bm0 with Bmn, m is 1-255, carries out environment temperature adaptive equalization.
2. according to the Multivariate combined-type linear temperature-sensing fire detector described in claim one, sensing unit adopts three core flat structures, three heart yearns are conductor, be arranged in parallel, wherein fill the negative temperature coefficient insulating material to slowly change or fast-changing temperature can be responsive between heart yearn 2,3, form the sensing cable with sense of continuity temperature function; Between heart yearn 1,3, sensing module is set at a certain distance, sensing module is pressed on negative temperature coefficient insulating material, and connection terminal is welded with heart yearn 1,3, installation infrared temperature sensor on sensing module, can realize remote non-contact type temperature measurement; The additional water-proof jacket of three heart yearns.
3. according to the Multivariate combined-type linear temperature-sensing fire detector described in claim one, sensing unit also can adopt four-core flat structure, quad is conductor, be arranged in parallel, wherein heart yearn 1,2,3 and the heart yearn 1 in three core flat structures, 2,3 identical, heart yearn 4 is parallel to heart yearn 3 and arranges, and role is consistent with the effect of heart yearn 3.
4. according to the Multivariate combined-type linear temperature-sensing fire detector described in claim one, sensing unit had both comprised the sensing cable with sense of continuity temperature function, comprise again the sensing module of highly sensitive remote temperature sensing function, line formula temperature-sensitive and point type temperature-sensitive is adopted to combine, the temperature detection mode of the sensor phase compound of two kinds of different thermometric mechanism; Spacing between sensing module 6 is 1-8 rice, and quantity mostly is 255 most, and therefore sensing unit is the longest reaches 2Km.
5., according to the Multivariate combined-type linear temperature-sensing fire detector described in claim one, the sensing module of sensing unit is by level-conversion circuit, signal decoding circuit, response control circuit, infrared temperature sensor, semiconductor temperature sensor, channel selection circuit, signal amplification circuit, form from CPU processor; The output signal of heart yearn 1,3 exports signal decoding circuit to through level-conversion circuit, signal decoding circuit outputs signal to from CPU input end, level-conversion circuit is exported to through response control circuit from the answer information of CPU, level-conversion circuit output signal to heart yearn 1,3, realize and the bidirectional data transfers of microprocessor; The output of infrared temperature sensor is connected to the input of channel selection circuit, and the output of channel selection circuit is connected to the input of signal amplification circuit, and the output of signal amplification circuit is connected to the input from CPU; Control output from the channel selecting of CPU and be connected to channel selection circuit, realize the signals collecting to two kinds of different temperatures sensors.
6. according to the Multivariate combined-type linear temperature-sensing fire detector described in claim one, the sensing module of sensing unit comprises infrared temperature sensor and semiconductor temperature sensor, or the two optional one.
7. according to the Multivariate combined-type linear temperature-sensing fire detector described in claim one, it is characterized in that: warning section display circuit is made up of LED charactron or LCD liquid crystal display, can displays temperature and alarm set point and sensing module address location; Warning output control circuit comprises optocoupler and relay, and CPU exports control signal and is connected to relay by optocoupler, and relay output end is connected to remote control equipment, realizes the isolated controlling exported of reporting to the police.
8. according to the Multivariate combined-type linear temperature-sensing fire detector described in claim one, it is characterized in that: microprocessor adopts the mode signaling of width modulation, 12 information are sent out altogether when patrolling and examining sensing module, signaling order is 4, pattern position, address bit 8, pattern position and address bit all first send out low level, and rear high-order; After starting working, microprocessor patrols and examines sensing module from 1 to 255 order, and midfeather certain hour is bus charging; Sensing module adopts and draws current system to answer information, and answer information is digital quantity, first answers low level during answer, and rear answer is high-order; Dormant state is in during sensing module flat from CPU, be waken up when carrying out data communication, start receiving mode position and address bit, after the address bit received and the machine address coincide, the machine address date is answered in the answer stage of communication succession, the temperature data being about to obtain postbacks to microprocessor by bus, communication is complete, the temperature data of infrared temperature sensor and semiconductor temperature sensor is gathered from CPU, be that data communication is prepared after process next time, then reenter dormant state.
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