CN2241900Y

CN2241900Y - Fireproof photoelectric detector

Info

Publication number: CN2241900Y
Application number: CN 95203380
Authority: CN
Inventors: 陈哲生; 唐保俭
Original assignee: Guangzhou Communication Equipment Factory Ministry Of Posts & Telecommunication
Current assignee: Guangzhou Communication Equipment Factory Ministry Of Posts & Telecommunication
Priority date: 1995-01-26
Filing date: 1995-01-26
Publication date: 1996-12-04
Anticipated expiration: 2005-01-26

Abstract

The utility model discloses a fireproof photoelectric detector, which is composed of an infrared light emitting unit, an infrared light receiving unit, an alarm unit, a program control timing and detecting switch SW< 1 >, an inhibiting switch SW< 2 >, etc. The utility model is characterized in that a chip U< 2 > is arranged between the emitting and receiving units and the alarm unit as the smoke detecting special control chip. The use of the special detecting control chip and a high-performance sensor can improve the control performance of the circuit. The detector has the function of smoke detection and can analyze, indicate and alarm the faults. The utility model has the advantages of high sensitivity, safety, etc.

Description

The fire prevention photodetector

The utility model relates to safety devices against fire, particularly a kind of fire prevention photodetector.

Present most optical detector of fire smokes of circulation on the market, the ubiquity function singleness, generally by an infraluminescence pipe, infrared light receiving tube, and convert the photocurrent that receives to voltage or electric current is formed with the circuit of signal, signal is done very simple processing.Thereby can't be to the detector operation state, parameters such as the supply voltage of detector detect.Not, because the design reasons of circuit, great majority also exist power consumption big, power supply mode is restricted, make some detectors must adopt the power-supply unit of larger capacity could guarantee the long-term operate as normal of detection circuit, and its alarm condition is to provide indication by a luminotron, can not send chimes of doom, the scene can't allow amblyope (especially blind person) band band warn, because the defective of these functions, cause being independent of other opertaing device and work independently, can only be matched in control box to use, range of application is subjected to certain restriction.

The purpose of this utility model provides a kind of simple in structure, and is highly sensitive, low in energy consumption, and automatic sound-light alarm also is provided with the photodetector of functions such as self check, inhibition.

The purpose of this utility model is achieved by the following scheme: it comprises infrared light transmitter unit, infrared light receiving element, formations such as timing network, acousto-optic warning unit, program control timer U3 (MC14536BCP) and switch SW 1, SW2, its technical solution are to transmit and receive the unit and regularly and between the alarm unit circuit be provided with chip U2 (MC145010P) as the smoke detection special chip.

1 to 4 pin and the infrared receiver of the said chip U2 of the utility model join, wherein 1,2 human hair combing wastes are not through resistance R 15, capacitor C 7, the positive pole of C8 and receiving tube D4 joins, 3 pin of U2 and the negative pole of quantities received D4 join, 4 pin of U2 are through resistance R 13, adjustable resistance VR1, resistance R 12, diode D1 connects positive source, 5 pin of U2 are connected to 16 pin of timer U3 respectively, 10 pin and 12 pin, be connected to positive source again, 6 pin of U2 are connected with the base stage of the triode Q1 of infrared emission unit, and 7 pin connect independent inner connecting interface through resistance R 2, simultaneously at 8 of U2,9, also be connected in series a hummer H1 between 10 pin, 11 pin of U2 are connected with the light warning circuit that luminotron D3 forms with resistance R 6; 12,13 pin and resistance R 7, R8, the timing grid that capacitor C 6 is formed joins, 14 pin earthing potentials, 15 pin connect positive source through resistance R 10, and 16 join switch SW 1, another termination positive source of SW2 with the end of switch SW 1 and SW2 respectively.

The utility model is compared with the prior art: because after being provided with special detection control chip and high performance sensor in the circuit, the detection reliability of circuit is improved greatly, add Circuit Optimization, power consumption reduces greatly, monitoring current reaches the A utmost point, thereby power supply can be worked alone by 9 volts of alkaline batteries supplies.In addition, the utility model can also be analyzed fault, indication and simulation alarm except that surveying the smog function.It is simple to have circuit structure, and the detection sensitivity height is easy to install and use, applied range, its full advantage such as reliable.

Below in conjunction with accompanying drawing the utility model is illustrated:

Fig. 1 is a circuit structure diagram of the present utility model.

Circuit working principle as shown in Figure 1 is: by infraluminescence pipe D2, the sensor that infrared electro receiving tube D4 forms D4 when smokeless does not work, D4 received that the light of cigarette scattering produces photocurrent when cigarette was arranged, make the 3 pin change in voltage of chip U2, (10ms once) constantly detected to 3 pin voltages in chip U2 inside, when detecting setting value, chip with fire alarm from 7,8,9,10,11 pin are sent, make the D3 in the light warning circuit glittering, the hummer H1 of sound warning circuit sends chimes of doom, simultaneously per 40 seconds of the internal circuit of U2 to 15 pin voltage detecting once, when measuring voltage when being lower than setting value, buzzer will be followed the glittering chimes of doom that sends of luminotron D3.This voltage is by resistance R 9, and R10 and supply voltage are determined, thereby be can be used for judging the fault of power supply.

When switch SW 2 was connected, 16 pin of chip U2 were high level, and this moment, fire alarm signal was sent in the U2 simulation, in order to detect the detector operation situation.Just often D3 is glittering, and hummer is rung, in this circuit by resistance R 7, R8, capacitor C 6 is formed timing networks; Diode D3, resistance R 6 is formed light warning circuit, capacitor C 8, C7, resistance R 12, R13, R14 and resistance R 15 are formed the sensitivity adjustment network, (wherein R14 is the light signal transfer resistance of D4, resistance R 11, R3 and triode Q1, capacitor C 4 is formed optical transmission circuit, resistance R 4, R5, capacitor C 5 is formed hummer vibration sounding alarm circuit; U3 (MC14536BCP) is common program control timer; Resistance R 23, R24, capacitor C 9 constitutes timing network, capacitor C 10, resistance R 22 constitutes the power-up initializing circuit of timer U3.When switch SW 1 was connected, 2 pin of U3 transferred high level to by low level, and U3 resets to timer, 13 pin output low levels, D2 stops luminous, and detection circuit quits work, promptly said inhibition duty, when timing arrives, 13 pin of U3 recover high level, and detector enters normal monitoring state again.

Claims

1, a kind of fire prevention photodetector, comprise the infrared light transmitter unit, the infrared light receiving element, timing network, acousto-optic warning unit, program control timer U3 (MC14536BCP) and self-test switch SW1 suppress switch SW 2 formations such as grade, it is characterized in that: transmitting and receiving the unit and regularly and between the alarm unit circuit be provided with chip U2 (MC145010P) as the smoke detection special integrated circuit.

2, fire prevention photoconductive detector according to claim 1, it is characterized in that: 1 to 4 pin and the infrared receiver of special chip U2 join, wherein 1,2 pin are respectively through resistance R 15, resistance 5, capacitor C 7, the positive pole of C8 and quantities received D4 joins, 3 pin of U2 and the negative pole of receiving tube D4 join, 4 pin of chip U2 are through resistance R 13, resistance VR1, resistance R 12, diode D1 connects positive source, 5 pin of U2 are received 16 pin of timer U3 respectively, 10 pin, 12 pin, and be connected to positive source, 6 pin of chip U2 are connected with the base stage of the triode Q1 of infrared light transmitter unit, 7 pin meet the inner RP1 that connects of independent head through resistance R 2, simultaneously at 8 of U2,9, also be connected in series a hummer H1 between 10 pin, the light warning circuit that 11 pin of chip U2 and resistance R 6 and luminotron D3 form, 12,13 pin and resistance R 7, R8, the timing network that capacitor C 6 is formed joins, 14 pin earthing potentials, and 15 pin connect positive source through resistance R 10,16 pin join switch SW 1 with detector switch SW1 with an end that suppresses switch SW 2 respectively, the termination power positive pole of SW2.