CN201369086Y

CN201369086Y - Temperature measuring type fire disaster alarm circuit

Info

Publication number: CN201369086Y
Application number: CNU200920136802XU
Authority: CN
Inventors: 傅俊豪
Original assignee: QUANZHOU JICHAO ELECTRONIC CO Ltd
Current assignee: QUANZHOU JICHAO ELECTRONIC CO Ltd
Priority date: 2009-02-17
Filing date: 2009-02-17
Publication date: 2009-12-23
Anticipated expiration: 2019-02-17

Abstract

The utility model relates to an electric alarm circuit, in particular to a temperature measuring type fire disaster alarm circuit with a temperature sensing head being a K-type temperature measuring line. The temperature measuring type fire disaster alarm circuit comprises a multipath temperature collection circuit, a microprocessor module, a display module, a key module and a power module, wherein the display module and the key module are connected with the microprocessor module; the multipath temperature collection circuit is a temperature collection circuit of the K-type temperature measuring line and is connected with an analog switch chip and then connected with a transport and placing module and an A/D converting circuit and then connected with the microprocessor module; and the microprocessor module is also connected with a remote communication module and a serial port storage chip, wherein the remote communication module is an RS232 communication module. The circuit also comprises an acousto-optic alarm module. The temperature measuring type fire disaster alarm circuit has the advantages of simple and reliable circuit, reliable detection way, computer on-line management and the like.

Description

Temp.-measuring type fire alarm circuit

Technical field

The utility model relates to the warning circuit of electronics, and especially relating to Temperature probe is the temp.-measuring type fire alarm circuit of K type thermometric line.

Background technology

Along with development and national economy and resident's modernization growth in the living standard, consumer increases year by year in large public building and the civilian installation, China's per capita household electricity consumption has turned over one and has turned in nearly 20 years, the hidden danger that electrical fire brings also increases severely thereupon, the electrical fire frequency happening in accident is more and more higher, and the country and people's the security of the lives and property has been caused grievous injury.According to statistics, electrical fire in recent years accounts for 30% of fire sum, is position first of all kinds of fire; The loss that electrical fire causes has accounted for about 40% of total fire damage, it should be noted that especially the fire that is caused by factors such as electric leakages just accounts for 70% of electrical fire; And crowd dead group of taking place in recent years hinders malignant fire, all is to be caused by electrical fire, therefore effectively controls electrical fire, and particularly effectively control is the current firemanic most important thing by the fire that factors such as electric leakage cause.

Electrical fire on fire mainly contains three kinds of modes, and one, electric spark and electric arc; Two, producing high temperature on electrical equipment or the circuit causes; Three, because the dangerous high temperature of connection terminal lead and the bad generation of termination contact, but owing to cable serious aging or loose contact cause occurrence index to improve constantly.

Though existing electric fire alarm control device can effectively prevent the generation of electrical fire,, cause certain infringement will certainly for buildings itself, especially to time-honored ancient buildings because wiring is loaded down with trivial details; And electric fire alarm control product is in " individual combat " state, and the place that the managerial personnel in the building can't know and determine to break down can't adapt to modernization, intellectualized management requirement.General electric fire alarm device is reported to the police by detecting its leakage current, such as Chinese patent application number: 200620068379.0 " a kind of electric fire alarm device " discloses a kind of electric fire alarm device, leakage control circuit and electric leakage prealarm circuit that it comprises zero-sequence transformer and connects described zero-sequence transformer output terminal, described leakage control circuit comprises the regulating resistor that is connected in described zero-sequence transformer rear end successively, filter, fairing, the unidirectional thyristor trigger electrode, the both positive and negative polarity of described unidirectional thyristor is connected with the output terminal of bridge rectifier respectively, be connected in series the tripping relay coil on the input end loop of described bridge rectifier, described electric leakage prealarm circuit and leakage control circuit are similar.Monitor by main line or branch line leakage current, and the fire-fighting pre-alarm is combined with electric leakage control, thereby reduce manufacturing cost, make the more reasonable economy of power system monitor, prevent unnecessary misoperation, fire is controlled at bud electrical network.

The utility model content

The utility model then adopts the more direct mode of another kind, adopts K type thermometric line monitoring cable surface temperature, and when electrical network cable generation electrical fire, the temperature of cable rises and reaches when setting dangerous values, sends alerting signal, and it is more quick directly.The utility model is mainly with compositions such as temperature sensing circuit, discharge circuit, analog switching circuit, single chip machine controlling circuit, warning circuits.

The utility model adopts following technical scheme:

Temp.-measuring type fire alarm circuit of the present utility model comprises multiplex temperature collection circuit, microprocessor module, display module, key-press module, power module, and described display module, key-press module are connected on the microprocessor module.Described multiplex temperature collection circuit is the temperature collection circuit of K type thermometric line, and it is connected to the analog switch chip, is connected to behind amplifier module and the A/D change-over circuit more in succession in described microprocessor module again; Described microprocessor also is connected in the telecommunication module.

Further, the microprocessor of described microprocessor module is singlechip microprocessor and peripheral crystal oscillator and reset circuit.

Further, described microprocessor module also is connected to the serial ports memory chip.

Further, described telecommunication module is the RS232 communication module.Described RS232 communication module adopts the MI232 dedicated IC chip.

Further, this circuit also comprises the sound and light alarm module.Also be connected with pilot lamp and audible alarm on the described microprocessor module.

Further, described pilot lamp is a LED light, and described audible alarm is that optical coupled switch is connected to sound chip and is connected in chip LM386 again and drives loudspeaker.

Further, described display module is a LCD MODULE.

Because the utility model adopts technique scheme, have that Based Intelligent Control and circuit are simple and reliable, detection mode reliable, can with advantage such as the online management of computer.

Description of drawings

Fig. 1 is a circuit module connection layout of the present utility model;

Fig. 2 is the circuit theory diagrams of the utility model most preferred embodiment.

Embodiment

Existing accompanying drawings and embodiment further specify the utility model.

As shown in Figure 1 and Figure 2, temp.-measuring type fire alarm circuit of the present utility model comprises multiplex temperature collection circuit, microprocessor module, display module, key-press module, power module, and described display module, key-press module are connected on the microprocessor module.Described multiplex temperature collection circuit is the temperature collection circuit of K type thermometric line, and it is connected to the analog switch chip, is connected to behind amplifier module and the A/D change-over circuit more in succession in described microprocessor module again; Described microprocessor also is connected in the telecommunication module.

K type thermometric line (thermopair) has the output of good linear voltage, when the contact of K type thermometric line contacts the cable surface temperature and reaches certain value, K type thermometric line can produce small d. c. voltage signal, this signal is input to analog switching circuit U2 the 13rd pin, by the inner switching controls of analog switching circuit U2, by analog switching circuit U2 the 3rd pin signal is exported, be input to transport and placing device U14 the 3rd pin again, after being input to U5 the 3rd pin internal arithmetic amplification again, export by 6 pin, this signal is input to A/D converter U3 the 1st pin (U3 is 8 A/D converters of high speed of band multiplexer and voltage reference) after amplifying, when reaching design temperature, single-chip microcomputer U4 divides four tunnel outputs; The first via is formed the serial output driving circuit, LCD display displays temperature value and the warning message of LCD chip for driving U7 by 3 pin, 4 pin, 5 pin, 6 pin, 7 pin of 33 pin, 6 pin, 7 pin, 8 pin and the LCD chip for driving U7 of single-chip microcomputer U4; The 35 pin high level of secondary route LCD chip for driving U7 become low level, and the indication of driving LED 2 alarm lamps is luminous.Third Road becomes low level by the 38 pin high level of LCD chip for driving U7, and triode Q5 conducting ends, and makes the relay J adhesive, provides one often to open or normally closed point, as signal feedback.The 4th route single-chip microcomputer U4 the 39th pin high level becomes low level, make optocoupler U10 enter the conducting cut-off state through resistance R 1 current limliting, make triode T1 conducting, sound chip U8, note amplifier U9 obtain voltage simultaneously, by the 2 pin output audio signals of sound chip U8, are added to note amplifier U9 the 3rd pin input end, after sound signal is amplified, by the output of the 5th pin, through capacitor C 1 coupling, Y sends alarm sound by loudspeaker.

Described herein is 1 tunnel temperature detection control principle wherein, and other ways are identical with 1 the tunnel, no longer repeats here.

Further, described microprocessor module also is connected to serial interface memory chip 5045.

Further, described RS232 communication module adopts the MI232 dedicated IC chip.

The utility model is by 15 pin of resistance R 39, button K1-K5, functional chip U2, the keyboard control circuit that 16 pin are formed, can be to alert sound setting, self check, button operation such as reset.

Rs 232 level conversion of the present utility model realize that circuit for remotely controlling is by resistance R 30, optocoupler U13, triode T3, resistance R 27, resistance R 25 and resistance R 26, transport and placing device U14, resistance R 28, resistance R 29, the high-low level change-over circuit that resistance R 19 is formed, when 15 pin of functional chip U2 are exported high level, make triode T2 conducting through resistance R 19 current limlitings, transport and placing device U14 output low level, 15 pin of both circuit and functional chip U2,36 pin form the closed loop current driving circuit, logical MI232 special IC carries out level conversion, be added to PC by com port, special-purpose configuration software is installed, can lead to Long-distance Control to two groups of high-low level change-over circuits and the inner I/O mouth of functional chip U2, realize operations such as " remote regulating; remote measurement; remote control; distant news ", and can write down the warning current state by software, print fault form etc.

Power circuit of the present utility model: have the two-way independent current source to supply with, guarantee the trigger circuit reliably working.The bridge rectifier circuit of forming by diode 1D1-1D4, low-and high-frequency capacitor filtering through capacitor C 9, capacitor C 8, be input to the 1st pin of 5V power supply chip U16, through inner voltage stabilizing, DC voltage by the 3rd pin output 5V, through capacitor C 6, capacitor C 7 high and low frequency filtering, provide+direct-current working volts of 5V to the utility model.The bridge rectifier circuit of forming by diode 1D5-1D8, through capacitor C 10, capacitor C 11 filtering, be input to the 1st pin of 12V power supply chip U16, through inner voltage stabilizing, DC voltage by the 3rd pin output 12V, through capacitor C 12, capacitor C 13 high and low frequency filtering, provide+direct-current working volts of 12V to the utility model.

Although specifically show and introduced the utility model in conjunction with preferred embodiment; but the those skilled in the art should be understood that; in the spirit and scope of the present utility model that do not break away from appended claims and limited; can make various variations to the utility model in the form and details, be protection domain of the present utility model.

Claims

1. temp.-measuring type fire alarm circuit, comprise multiplex temperature collection circuit, microprocessor module, display module, key-press module, power module, described display module, key-press module are connected on the microprocessor module, it is characterized in that: described multiplex temperature collection circuit is the temperature collection circuit of K type thermometric line, it is connected to the analog switch chip, is connected to behind amplifier module and the A/D change-over circuit more in succession in described microprocessor module again; Described microprocessor also is connected in the telecommunication module.

2. temp.-measuring type fire alarm circuit as claimed in claim 1 is characterized in that: the microprocessor of described microprocessor module is singlechip microprocessor and peripheral crystal oscillator and reset circuit.

3. temp.-measuring type fire alarm circuit as claimed in claim 1, it is characterized in that: described microprocessor module also is connected to the serial ports memory chip.

4. temp.-measuring type fire alarm circuit as claimed in claim 1 is characterized in that: described telecommunication module is the RS232 communication module.

5. temp.-measuring type fire alarm circuit as claimed in claim 1 is characterized in that: also be connected with pilot lamp and audible alarm on the described microprocessor module.

6. temp.-measuring type fire alarm circuit as claimed in claim 5 is characterized in that: described pilot lamp is a LED light, and described audible alarm is that optical coupled switch is connected to sound chip and is connected in chip LM386 again and drives loudspeaker.

7. temp.-measuring type fire alarm circuit as claimed in claim 1 is characterized in that: described display module is a LCD MODULE.