CN2049003U - Alarm for fire of textile dust room - Google Patents

Abstract

The utility model discloses an alarm for the fire of the textile dust room, comprising a plurality of sensing elements, a detecting circuit, an alarm circuit and a dust removing device. The sensing elements are arranged on a same detecting head and share an amplifying and driving unit. The dust removing device comprises a net cover, two wings with brushes and blades provided and coaxial with the two wings. The alarm can forecast the happening of the fire under the environment with high dust content and large wind speed.

Description

Alarm for fire of textile dust room

The utility model is a kind of alarm that is used for forecast fire in dustiness height, the environment, particularly textile mills' dirt chamber that wind speed is big.

Known fire-alarm, for example the fire-alarm of Chinese patent 85204022 introductions adopts constant-current supply and dual input differential type testing circuit.It has multiparameter input, differential type detection, dependable performance, advantage of high precision, can carry out fire forecast according to temperature difference, luminance difference, combustible gas concentration and smokescope.But this alarm is unsuitable for being contained in the high and big such particular environment of wind speed of dustiness that textile mills dirt chamber had.

The purpose of this utility model provides a kind of textile mills dirt chamber fire-alarm, it can be in the big environment of dustiness height, wind speed accurate forecast disaster hidden-trouble.

The utility model is achieved in that comprising sensing circuit, detecting on the fire-alarm of amplifying circuit and warning circuit, increases a fly-ash separator, this fly-ash separator comprise guard, guard external belt hairbrush both wings and with the coaxial mounted blade of both wings.A detection head that is covered by guard is housed below above-mentioned guard, the shell of detection head is connected mutually with guard, sensing circuit is housed on the circuit board of detection head enclosure and detects amplifying circuit, the sensing element of sensing circuit stretches out the detection head cover top portion and is exposed in the guard.During use, fly-ash separator that fuses and detection head are contained in the air channel, dirt chamber, and warning circuit and other circuit are contained in the control box in addition of dirt chamber, and two place's circuit link to each other with lead.When high velocity air in the air channel, dirt chamber drives the blade rotation of fly-ash separator, blade drives double-vane and hairbrush rotation thereof again, thereby remove the dust in the detected air-flow that enters in the guard, avoid the influence of dust, thereby make the fire-alarm of band sensing element can be applied in the such specific environment in dustiness textile mills dirt chamber high and that wind speed is big sensing element.In order to improve accuracy of detection, sensing circuit adopts three, the temperature sensing circuit of the resistor-type temperature fuse that promptly be respectively the smog sensing circuit that adopts the high sensitivity semiconductor gas sensor, adopts high setting accuracy and the flame sensing circuit that adopts the infrared ray high energy receiver of band lens, these three sensing circuits are respectively as remote, middle distance and the closely detection of disaster hidden-trouble.Three shared detection amplifying circuits of sensing circuit, interfere with each other during for unlikely circuit working, three sensing circuits and the connected mode that detects amplifying circuit, take to be in series with temperature sensing circuit again after the signal output part parallel connection with smog sensing circuit and flame sensing circuit, series circuit with this composition is connected both ends of power then, make temperature sensing circuit power path is provided for other two sensing circuits, also the signal output part of smog sensing circuit and flame sensing circuit all is attempted by the input end of detection amplifying circuit simultaneously.

Because the utility model only need be installed a fly-ash separator and change several sensing elements, thus structure and uncomplicated, and because these sensing elements can be surveyed respectively far, in in-plant disaster hidden-trouble, therefore the accuracy of detection is strong.

Below in conjunction with drawings and Examples the utility model is described in detail.

Fig. 1 is the structural representation that fly-ash separator and detection head are connected as a single entity.

Reference numeral among Fig. 1 is: 1, nut; 2, packing ring; 3, blade; 4, cushion cover; 5, brush axle; 6, both wings; 7, copper sheathing; 8, copper guard; 9, guard frame; 10, semiconductor gas sensor; 11, copper sheathing; 12, snap ring; 13, detection head shell; 14, printed circuit board (PCB); 15, fixed screw; 16, temperature fuse; 17, infrared ray high energy receiver.

Fig. 2 is the electrical schematic diagram of the utility model specific embodiment.Below the circuit structure among Fig. 2 and the course of work are described in detail.

(1) detection head part

(1) smog sensing circuit: this circuit is by semiconductor gas sensor QM-N5 outer meeting resistance R ₈And capacitor C ₉Form.When gas sensor QM-N5 runs into the CO gas that contains in the fire dense smoke, detect that equivalent resistance descends between the utmost point, make it and temperature fuse Th75C and potentiometer W ₂The intrinsic standoff ratio that is in series reduces, and detects the current potential reduction that utmost point output A is ordered, and forms a negative pulse thus and is added in detection amplifying circuit IC ₄2. pin of triggering input end, make IC immediately ₄ Output terminal 3. pin become high level from low level, this high level is delivered to the corresponding switching transistor BG of relay part in the control box by connecting lead ₆Base stage, BG ₆Become conducting, relay ZJ by ending ₁Action, ZD ₁Lamp is bright, is connected the ZJ in the bidirectional triode thyristor static switch circuit partly simultaneously ₁Normally closed contact disconnect bidirectional triode thyristor BCR ₁Because of triggerless voltage turn-offs, A.C. contactor C ₁Dead electricity, the centrifugal exhauster stall that it drove.Owing to there is not sufficient air, the vexed condition of a fire in the subterranean pipe line of dirt chamber just is controlled in the stage of just sending out.When turning off blower fan, BG ₆Conducting also make D ₁₅Conducting, relay ZJ ₀The circuit that the part of reporting to the police is connected in adhesive, its normally opened contact sends the alarm sound of similar fire engine to the workshop, to tell people fire alarm has taken place.Potentiometer W ₂Be to use as regulating warning sensitivity.

After smog (CO gas) disappears, IC ₄6. pin approximately through being charged to 2/3 V gradually after 1 minute the time-delay _CCSupply voltage, 3. pin turns back to low level, BG at once ₆End, detect amplifying circuit and get back to standby condition again.

(2) temperature sensing circuit: by temperature fuse Th75C and potentiometer W ₂Be in series, they also play a part to provide power supply to smog sensing circuit and flame sensing circuit simultaneously.When a large amount of hot blasts that caught fire during through temperature sensor Th75C, its inner fusible core fuses because of running into the thermal current that surpasses 75 ℃, and this moment, power supply negative terminal also made IC ₄2. pin add a negative pulse, produce and the such Blowing stopper of above-mentioned smog sensing circuit and the same course of work of reporting to the police to the workshop.As long as change a Th75C as changing insurance after the accident treatment.

(3) flame sensing circuit: by the infrared ray high energy receiver R of band lens _dSerial connection potentiometer W ₃And resistance R ₉The power supply bleeder circuit of forming adds triode BG ₅Form resistance R ₉The dividing potential drop at two ends is as triode BG ₅Basic radio press the W of said temperature sensing circuit ₅With Th75C reality as triode BG ₅Load.When flame during near detection head, infrared ray high energy receiver R _dDetect the infrared ray in the flame, its resistance value is fallen greatly, R ₉The two ends partial pressure value improves and makes BG ₅Base voltage improves, thus BG ₅Emitter-base bandgap grading output terminals A point current potential reduces, and also makes IC ₄2. pin obtain a negative pulse, produce the same course of work turning off blower fan and to workshop report to the police such with above-mentioned smog sensing circuit.R _dAdopt H32, its function of surveying low-light is extremely strong.

(4) detect amplifying circuit: by " omnipotent integrated package " NE555 time base circuit IC ₄Amplifier, outer meeting resistance R again make comparisons ₁₀With R ₁₁, capacitor C ₁₀With C ₁₁And light emitting diode D ₅Form R ₁₁With D ₅The luminous display circuit of forming comparison amplifier output.Described by aforementioned the utility model basic design scheme, the signal output part A of smog sensing circuit and flame sensing circuit and zero-bit ground end all are attempted by IC ₄2. pin and 1. between the pin of input trigger end, the output terminal of smog sensing circuit and the parallel connection of flame sensing circuit is in series with temperature sensing circuit again and is connected to supply voltage V _CCAnd between the zero-bit ground end, thereby form the non-interfering comprehensive parameters sensor-based system of a shared detection amplifying circuit.So just according to the stage of fire organic growth in the air channel, dirt chamber, promptly earlier from dense smoke, temperature raises then, and the process of flame takes place again, by three kinds of sensors form far, in, in-plant multiple defence line, make that the reliability of the utility model alarm is very high.Resistance R ₇With light emitting diode D ₄As the luminous display circuit of supplying with detection head part power supply, wherein light emitting diode D ₄Be contained on the detection head outer casing top surface.

(2) relay part: by triode BG ₆, resistance R ₁₂, capacitor C ₁₂, SCR control relay ZJ ₁, pilot lamp ZD ₁And diode D ₁₅Form a relay control unit, Fig. 2 embodiment has 10 such relay control units and (comprises from ZJ ₁To ZJ ₁₀), partly match the shared controlling alarm relay ZJ of these 10 relay control units respectively with corresponding 10 detection heads ₀With pilot lamp ZD ₁₁Above-mentioned relay control unit and detection head part also can not be 10, but can increase and decrease according to the actual needs of check point number.The principle of work of whole relay control is, from IC ₄The level of drive that 3. output terminal is exported is in low level state at ordinary times, in case sensing circuit detects the condition of a fire, 3. the pin upset is high level, BG ₆Transfer conducting, ZJ to from ending ₁Get electric adhesive, ZD ₁Lamp is bright, simultaneously ZJ ₀Pass through D ₁₅Get electric adhesive, ZD ₁₁Lamp is bright.Obviously, the diode D of 10 relay control units ₆To D ₁₅For ZJ ₀Form an OR circuit.

(3) bidirectional triode thyristor static switch part: mainly by bidirectional triode thyristor BCR ₁, A.C. contactor JC ₁, resistance R ₂₂And ZJ ₁Normally closed contact form.In Fig. 2 embodiment, such bidirectional triode thyristor static switch part also has 10, and is corresponding one by one with above-mentioned 10 relay control units respectively.When not having the condition of a fire, above-mentioned ZJ ₁Discharge its normally closed contact closure, BCR ₁Trigger electrode G pass through R ₂₂Obtain synchronous triggering voltage, JC ₁Adhesive after pressing driving button AN, the load operate as normal, in case the condition of a fire is arranged, as previously mentioned, ZJ ₁Adhesive immediately, its normally closed contact disconnects, BCR ₁End JC ₁The outage shutdown.R ₂₃And C ₂₂Be BCR ₁Resistance-capacitance protection, K ₂For making the switch of test usefulness, TA is a stop button.

(4) power supply and time-delay part: power unit is by transformer B, insurance BX ₁, K switch ₁, neon lamp ND, bridge circuit QL and capacitor C ₁Form transformation commonly used and current rectifying and wave filtering circuit, mu balanced circuit mainly adopts triode BG ₁With three end integrated regulated power supply IC ₁, capacitor C ₁To C ₄, resistance R ₁With R ₂And potentiometer W ₁Be external counterpart, this voltage stabilizing li has carrying load ability and the overheating protection up to 15A, can adjust to the designing requirement value to the voltage of delivering to detection head according to conductor length during installation.

Gas sensor detects the resistance instability of the utmost point when just starting working, designed the high delay circuit of repeatable accuracy, mainly by NE555 time base circuit IC for this reason ₂And time-delay pilot relay ZJ ₀₀Form.IC during start just ₂2. pin be that low level is triggered, 3. pin output high level, relay ZJ ₀₀Adhesive, by its power supply in normally closed contact disconnection relay part of relay part, only to the detection head power supply, warning this moment part and bidirectional triode thyristor static switch part all keep non-action state, because IC ₂Input end be connected to resistance R ₃And capacitor C ₅Charge-discharge circuit is so about 1.1R that delays time after start ₃C ₅After the time of size, 3. the pin upset is low level, ZJ ₀₀Discharge, relay partly the electric standby condition that enters.C ₆Be IC ₂5. the external capacitor of pin, R ₄And D ₂Be the luminous display circuit of time-delay part, D ₃Be fly-wheel diode.

(5) warning part: the alert audio signal generating circuit is mainly by KD9561 VLSI (very large scale integrated circuit) IC ₃Constitute, it has four kinds of sound available, and the utility model has been selected the audible alarm of fire engine for use.IC ₃For the 3V power supply, undistorted in order to guarantee, adopted by triode BG ₄Stabilivolt WY, resistance R ₅With R ₆And capacitor C ₇With C ₈Electronic filter power supply because this alarm major function is the control electromechanical equipment, alarm sound is assisted, so audio power drive part employing triode BG ₃With BG ₂The Darlington transistor of forming reduces cost to simplify circuit.S ₂Be the loudspeaker of 5W left and right sides power, as above-mentioned relay ZJ ₀Electric after, the warning of promptly working of its normally opened contact closure, the part of reporting to the police.

Claims (2)

1, the fire-alarm that is used for textile mills dirt chamber, it includes sensing circuit, detects amplifying circuit and warning circuit, of the present utility model being characterised in that, it also has a fly-ash separator, this fly-ash separator comprise guard, guard external belt hairbrush both wings and with the coaxial mounted blade of both wings, a detection head that is covered by guard is housed below guard, the shell of detection head is connected mutually with guard, sensing circuit is housed on the circuit board of detection head enclosure and detects amplifying circuit, the sensing element of sensing circuit stretches out the detection head housing department and is exposed in the guard.

2, fire-alarm as claimed in claim 1, it is characterized in that described sensing circuit adopts three, promptly be respectively the smog sensing circuit that adopts the high sensitivity semiconductor gas sensor, adopt the temperature sensing circuit of temperature fuse of high setting accuracy and the flame sensing circuit that adopts the infrared ray high energy receiver of band lens, the shared detection amplifying circuit of these three sensing circuits, three sensing circuits and the connected mode that detects amplifying circuit, take to be in series with temperature sensing circuit again after the signal output part parallel connection with smog sensing circuit and flame sensing circuit, series circuit with this composition is connected both ends of power then, also the signal output part of smog sensing circuit and flame sensing circuit all is attempted by the input end of detection amplifying circuit simultaneously.

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