CN202196487U

CN202196487U - Fire automatic alarm device

Info

Publication number: CN202196487U
Application number: CN2011202468944U
Authority: CN
Inventors: 董彦良
Original assignee: Suzhou Institute of Trade and Commerce
Current assignee: Suzhou Institute of Trade and Commerce
Priority date: 2011-07-14
Filing date: 2011-07-14
Publication date: 2012-04-18
Anticipated expiration: 2021-07-14

Abstract

The utility model discloses a fire automatic alarm device, which comprises a single chip microcomputer electrically connected with a power supply circuit respectively for providing power for the device, a temperature sensing circuit for collecting temperature around the device, a smoke density sampling circuit for collecting smoke density of a fire spot, a display circuit for displaying temperature values and an alarm circuit. The temperature sensing circuit and the smoke density sampling circuit convert temperature and density signals into electrical signals of the fire spot and send the electrical signals to the single chip microcomputer, the single chip microcomputer processes the electrical signals, and calculated temperature values are displayed on the display circuit. When the temperature values exceed preset values, the alarm circuit gives out alarms. The fire automatic alarm device has the advantages of being simple in structure, low in cost, widely applicable and the like.

Description

A kind of automatic fire alarm device

Technical field

The utility model relates to a kind of automatic fire alarm device, concrete relates to a kind of automatic fire alarm device that is used for small fireproof units such as residential neighborhoods, machine room, office.

Background technology

The automatic fire alarm control system of China experienced from having to do not having, from simple to the evolution of complicacy, its self energy degree is increasingly high.At present, domestic manufacturer lays particular stress on the research and development that are used for bulk storage plant, market, senior office building, hotels and other places large-sized fire warning system mostly, and this automatic alarm system generally is made up of fire detector, local fire alarm control panel and central fire alarm control panel; Also can link with various fire-fighting equipments and communication device, to form central control system according to the requirement of engineering.Promptly by automatic warning, self-extinguishing, safe escape induce, systematic procedure shows, a complete fire-fighting control system is formed in fire-fighting file administration etc., they adopt concentrated area control type of alarm, its system complex, cost is high.And in small fireproof units such as residential neighborhoods, machine room, offices; Need the practical automatic fire alarm sniffer of a kind of small inexpensive; Promptly only need detect the imminent stage of fire; Object burning will be supervened a large amount of smog, very high situations such as temperature, will send the bright information of red light automatically, and the prompting people are about to breaking out of fire.Thereby carry out certain measure, or put out a fire, or the emergency escape scene that catches fire, thereby avoid causing some unnecessary property loss and casualties.Requisite when therefore, developing a kind of simple, cheap automatic fire alarm device.

The utility model content

For overcoming the deficiency of prior art, the purpose of the utility model is to provide a kind of automatic fire alarm device.

In order to solve the problems of the technologies described above, realize above-mentioned purpose, the utility model is realized through following technical scheme:

A kind of automatic fire alarm device comprises a single-chip microcomputer, it is characterized in that: said single-chip microcomputer electrically connects a power circuit respectively, is used to provide this to install required power supply; A temperature sensing circuit is used for harvester temperature on every side; A smokescope sample circuit, the smokescope that is used to gather kindling point; A display circuit; Be used to show the measured temperature value; And warning circuit; Said temperature sensing circuit and said smokescope sample circuit change into electric signal with the signal of the temperature of burning things which may cause a fire disaster and concentration and send to single-chip microcomputer, after single-chip microcomputer is handled, the temperature value that is calculated is presented on the display circuit, and when temperature during above setting value warning circuit will report to the police.

Further, said single-chip microcomputer electrically connects said power circuit, said temperature sensing circuit, said smokescope sample circuit, said display circuit and said warning circuit.

Further, said single-chip microcomputer is a single-chip microcomputer that model is AT89S51.

Further, the said temperature sensing circuit digital temperature sensor that to have a model be DS18B20.

Further, said smokescope sample circuit has hot wire type semiconductor-type sensor, catalytic combustion type sensor or a semiconductor-type sensor.

Further, said display circuit has a digital tube display or LCD.

Compared with prior art, the utlity model has following advantage:

(1) can be applied in small fireproof units such as residential neighborhoods, machine room, offices;

(2) simple in structure, cheap.

Above-mentioned explanation only is the general introduction of the utility model technical scheme, in order more to know the technological means of understanding the utility model, and can implement according to the content of instructions, below be preferred embodiment and the conjunction with figs. of the utility model specify as after.The embodiment of the utility model is provided by following examples and accompanying drawing thereof in detail.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is done further detailed explanation.

Fig. 1 is the principle of work synoptic diagram of automatic fire alarm device.

Fig. 2 is the electrical block diagram of automatic fire alarm device.

Fig. 3 is the power circuit synoptic diagram of automatic fire alarm device.

Fig. 4 is the single chip computer architecture synoptic diagram of automatic fire alarm device.

Fig. 5 is the temperature sensing circuit synoptic diagram of automatic fire alarm device.

Fig. 6 is the smokescope sample circuit synoptic diagram of automatic fire alarm device.

Fig. 7 is the warning circuit synoptic diagram of automatic fire alarm device.

Fig. 8 is the display circuit synoptic diagram of automatic fire alarm device.

Embodiment

Referring to Fig. 1, shown in Figure 2, a kind of automatic fire alarm device of present embodiment comprises a single-chip microcomputer, and said single-chip microcomputer electrically connects a power circuit respectively, is used to provide this to install required power supply; A temperature sensing circuit is used for harvester temperature on every side; A smokescope sample circuit, the smokescope that is used to gather kindling point; A display circuit; Be used to show the measured temperature value; And warning circuit; Said temperature sensing circuit and said smokescope sample circuit change into electric signal with the signal of the temperature of burning things which may cause a fire disaster and concentration and send to single-chip microcomputer, after single-chip microcomputer is handled, the temperature value that is calculated is presented on the display circuit, and when temperature during above setting value warning circuit will report to the police.

Further, said single-chip microcomputer for example is a single-chip microcomputer that model is AT89S51.

Further, said temperature sensing circuit have one for example model be the digital temperature sensor of DS18B20.

Further, said display circuit has a digital tube display or LCD.

Automatic fire alarm device below in conjunction with using the utility model embodiment is done with detailed introduction.

The power circuit principle figure of the fire alarm installation of the utility model is as shown in Figure 3, and major part is to adopt linear voltage stabilization chip 7805 to realize voltage stabilizing, and when there was fluctuation in input voltage, output voltage kept constant device.Its cardinal principle is to pass through power transformer to single-phase alternating current, and rectification circuit, filtering circuit, mu balanced circuit change into galvanic current and press.

The Fundamentals of Mono-Chip Computers figure of the fire alarm installation of the utility model is as shown in Figure 4; AT89S51 is a low-power consumption; 8 single-chip microcomputers of high-performance CMOS; Sheet include 4k Bytes ISP (In-system programmable) can be erasable repeatedly 1000 times the Flash read-only program memory, device adopts high density, the nonvolatile storage technologies manufacturing of atmel corp, compatibility standard MCS-51 order set and 80C51 pin configuration; Integrated general 8 central processing units and ISPFlash storage unit in the chip, the AT89S51 of powerful microcomputer can be the solution that many embedded Control application systems provide high performance-price ratio.

It is to make other functional parts in CPU and the system all be in a definite original state that single-chip microcomputer resets, and starts working from this state, and the back PC=0000H that for example resets makes single-chip microcomputer from first unit instruction fetch.No matter be when single-chip microcomputer just begins to connect with the mains, still the outage back all will reset after perhaps breaking down.Reseting period (being that RST is between high period), the P0 mouth is high configuration, P1-P3 mouth output high level; PSEN is invalid for the external program memory read strobe signal.Address latch signal ALE also is a high level.

AT89S51 pin XTAL1 and XTAL2 and crystal oscillator and capacitor C 2, C3 are connected by mode shown in Fig. 2-2.Sheffer stroke gate in crystal oscillator, capacitor C 2/C3 and the sheet (as feedback, amplifier element) has constituted capacitance connecting three point type oscillator, and the capacity of oscillation signal frequency and crystal oscillator frequency and capacitor C 3, C2 is relevant, but mainly determines that by crystal oscillator frequency scope is between 0～33MHz.

The temperature sensing circuit of the fire alarm installation of the utility model is as shown in Figure 5, and temperature sensor DS18B20 serves as the control core with the AT89S51 single-chip microcomputer.At first, the corresponding small voltage signal process of the temperature that sensor is sent here is amplified, and changes into bigger voltage signal and sends into the AT89S51 single-chip microcomputer; Then, A/D changes, data is carried out linearization process in the AT89S51 single-chip microcomputer, digitized voltage signal is transformed into corresponding temperature value, and judge whether temperature value exceeds alarm limit, and when temperature exceeded the limit value of setting, red light was bright.

The smokescope sample circuit of the fire alarm installation of the utility model is as shown in Figure 6, and the Smoke Detection alarm serves as the control core with the AT89S51 single-chip microcomputer, adopts semiconductor-type sensor (CZ) sensor acquisition smog information.At first, the corresponding small voltage signal process of the smokescope that sensor is sent here is amplified, and changes into bigger voltage signal and sends into the AT89S51 single-chip microcomputer; Then, A/D conversion, concentration ratio carry out linearization process to data in the AT89S51 single-chip microcomputer, and digitized voltage signal is transformed into corresponding decimal system concentration value; At last, actual inflammable gas concentration is sent into liquid crystal, and judge whether concentration value exceeds alarm limit, and when smokescope exceeded the limit value of setting, red light was bright.Because smoke transducer need be worked under heated condition, and temperature is high more, reacts fast more, response time and release time are just fast more in addition.Be to improve the response time, guarantee sensor exactly, stably work, alarm need continue the voltage of a 5V of output to smoke transducer.In order to guarantee its reliability, in the voltage of output 5V, carry out malfunction monitoring.Said smokescope sample circuit also can use hot wire type semiconductor-type sensor or catalytic combustion type sensor acquisition smog information.

The warning circuit of the fire alarm installation of the utility model is as shown in Figure 7, and when the data after single-chip microcomputer is handled exceeded setting value, warning circuit will be reported to the police.Certainly be a simple warning circuit.When the P1.4 mouth was output as high level, light-emitting diodes was in control a second towards signal, and red light is bright, is warning.Be output as low level, the light emitting diode no signal, red light does not have demonstration, is normal.

The display circuit of the fire alarm installation of the utility model is as shown in Figure 8, adopts LCD LM016L to carry out temperature and shows.Display is standard 14 pin interfaces.1 pin ground connection wherein, 2 pin connect+the 5v power supply.The potentiometer that 3 pin meet a 2K plays the effect that adjustment contrasts.4 pin are that register is selected, selection instruction register when selecting data register, low level during high level.5 pin are reading writing signal line, carry out read operation during high level, carry out write operation during low level.When 4 pin and 5 pin can write instruction or explicit address during jointly for low level, when 4 pin are that low level 5 pin can be read busy signal during for high level, when 5 pin are that high level 4 pin can write data during for low level.The E end is an Enable Pin, when 6 foots become low level by the high level saltus step, and the Liquid Crystal Module fill order.DO is 8 bidirectional data lines to D7.Said display circuit also can use digital display tube displays temperature data.

The foregoing description is technical conceive and the characteristics for the utility model is described just, and its purpose is the content that lets the one of ordinary skilled in the art can understand the utility model and implements according to this, can not limit the protection domain of the utility model with this.The variation or the modification of every equivalence of having done according to the essence of the utility model content all should be encompassed in the protection domain of the utility model.

Claims

1. an automatic fire alarm device comprises a single-chip microcomputer, it is characterized in that: said single-chip microcomputer electrically connects a power circuit respectively, is used to provide this to install required power supply; A temperature sensing circuit is used for harvester temperature on every side; A smokescope sample circuit, the smokescope that is used to gather kindling point; A display circuit; Be used to show the measured temperature value; And warning circuit; Said temperature sensing circuit and said smokescope sample circuit change into electric signal with the signal of the temperature of burning things which may cause a fire disaster and concentration and send to single-chip microcomputer, after single-chip microcomputer is handled, the temperature value that is calculated is presented on the display circuit, and when temperature during above setting value warning circuit will report to the police.

2. according to claim 1 automatic fire alarm device, it is characterized in that: said single-chip microcomputer is a single-chip microcomputer that model is AT89S51.

3. according to claim 1 automatic fire alarm device, it is characterized in that: the digital temperature sensor that it is DS18820 that said temperature sensing circuit has a model.

4. according to claim 1 automatic fire alarm device, it is characterized in that: said smokescope sample circuit has hot wire type semiconductor-type sensor, catalytic combustion type sensor or a semiconductor-type sensor.

5. according to claim 1 automatic fire alarm device, it is characterized in that: said display circuit has a digital tube display or LCD.