CN2145919Y - Automatic monitor for cooker hood - Google Patents

Abstract

The utility model provides an automatic monitor for a cooker hood, mainly comprising a forcible reset switching circuit, an oil monitoring circuit, a buzz warning and blocking circuit, a drive delayer, a thyristor triggering circuit, an infrared emission circuit and an infrared receiving circuit. The utility model is characterized in that the warning circuit is additionally provided with a blocking circuit which is composed of a triode Q2, resistors R14, R15 and diodes D8, D9, so that a warning system can work normally no matter the utility model is under a manual or automatic working state; in addition, the thyristor triggering circuit which is amplified by the triode is arranged in the circuit, so that triggering electric current can be enhanced, and accordingly, a machine can work reliably under the environment of different temperature.

Description

Automatic monitor for cooker hood

The utility model relates to the device of multi-functional detection poisonous gas leakage, particularly a kind of smoke exhaust ventilator automator.

In the prior art, the 5th page of " CYBERSPACE " magazine in 1992 the tenth phase published about disclosed circuit structure and operation principle in the household smoke exhaust ventilator electronic monitor circuit, be unique soft-touch type electronic monitor that present home products generally adopts.The shortcoming of its existence is:

One, all like product does not all have illuminating lamp and controls automatically.

Two, when the long period uses, tobacco tar accumulates on the explosion-proof net of gas sensor, and the user can not removal sensor cleans, thereby makes the sensitivity of sensor reduce significantly or can not work at all, makes whole automatic system malfunctioning.

When three, machine places automatic function, meet the oil smoke air exhauster and open running automatically, and companion's buzzer for a long time toot cry.

Four, bidirectional triode thyristor circuits for triggering, adopt 555 time-base integrated circuits, and adopt low level to trigger (absorbing current trigger) by integrated circuit, because of the decline of silicon controlled trigger current with environment temperature increases, as meet low temperature environment, controllable silicon can't triggering and conducting, causes air exhauster or illuminating lamp normally not to open.

Five, when machine places manual function, warning system is closed because of cutting off the electricity supply, and therefore set warning system loses real significance.

The purpose of this utility model provides a kind of, on the basis of prior art all functions, sets up active infra-red line (emission, reception) detection circuit and photo resistance type luminosity control circuit and illuminating lamp according to the automatic open and close control of ambient light function.And no matter machine places manually or automatic function, warning system is the smoke exhaust ventilator automator of energy operate as normal all.

Technical solution of the present utility model is: a kind of smoke exhaust ventilator is monitored system automatically, is made up of power circuit, electronic switch and forced resetting on-off circuit, oil smoke monitoring and start delay circuit, buzzing alarm and lockout circuit, (motor) driving delayer, the triggering of (motor) controllable silicon, on-off circuit, infrared emission circuit, infrared reception and pre-amplification circuit, the triggering of (illuminating lamp) controllable silicon, on-off circuit.Its special character is that described forced resetting on-off circuit is made up of triode Q4, diode D4, D5, resistance R 22, R23.The base stage of Q4 and connect the input anode of integrated circuit A8 through resistance R 22, R41, the same ground connection of emitter stage of one end of resistance R 23 and Q4, the other end of R23 connects the base stage of Q4 and the end of R22 respectively, and the colelctor electrode of Q4 connects the input anode of A3 and A2 respectively through diode D4, D5.Described lockout circuit is made up of triode Q2, resistance R 14, R15, diode D8, D9.Wherein the colelctor electrode of triode Q2 meets buzzing sheet Y, and the base stage of Q2 connects the end of D8, D9 respectively through R14, and the other end of D8 connects the output of A5 through D12, and the other end of D9 connects the output of A6 through D16, D13.Described infrared transmitter: form by time-base integrated circuit IC4, triode Q10, infrared transmitting tube D18, resistance R 62-R65, diode D17, D19, capacitor C 17, C18, C19, wherein the base stage of Q10 connects the pin 3 of IC4, between the pin 6,7 of IC4 and meet R65 and D19.One end of capacitor C 17 is connected with the pin 5 of IC4, one end of capacitor C 18 connects the pin 2 of IC4 and the end of pin 6 and D19 respectively, the same ground connection of the other end of C17 and C18, the colelctor electrode sending and receiving light pipe D18 of Q10, the other end of D18 meets D17 through R63, the other end of D17 connects the Vcc point through R62, the grounded emitter end of Q10.Described infrared reception and pre-amplification circuit: by the preposition frequency-selecting amplification circuit of special infrared reception IC3, infrared receiving diode D15, triode Q9, diode D16, inductor L2, resistance R 54-R61, capacitor C 10-C16 forms, wherein, photoelectric receiving tube D15 is connected with the pin 7 of IC3, the pin 6 of IC3 connects the positive pole of capacitor C 13 through R56, the minus earth of C13, the pin 2 of IC3 connects the positive pole of capacitor C 14, the minus earth of C14, inductance L 2 connects the pin 3 of IC3 with capacitor C 11 parallel connections, the pin 4 of IC3 connects an end of capacitor C 12 and resistance R 57 respectively, another termination positive source of C12, the other end earth terminal of R57, the output pin 1 of IC3 connects the base stage of Q9 through resistance R 58, on the base stage of Q9, also be connected to simultaneously an end of resistance R 59 and capacitor C 15 respectively, the colelctor electrode difference connecting resistance R60 of Q9 and the end of diode D16, the end of another termination potentiometer W2 of D16, the other end of W2 meets Ba point and photo resistance R61 respectively, the other end earth terminal of R61.

The utlity model has following advantage:

One, active infra-red line (emission, receive) detection circuit and photo resistance type luminosity control circuit are set, thereby make the illuminating lamp can be according to the brightness automatic switch of environment.

Two, changed the mounting structure of gas sensor, but made the sensor utmost point carry out demolition, installation easily and clean, thus the sensitivity that has improved sensor.

Three, set up the lockout circuit of buzzer in warning circuit, make it under any circumstance, as long as air exhauster is opened running, this lockout circuit can be opened, when guaranteeing that machine is worked under auto state, buzzer only toot once.

Four, when watch-dog places manual function, the reporting system circuit all can operate as normal.As when meeting pernicious gas such as the oil gas of super concentration or oil smoke, before air exhauster does not turn round, will carry out sound always, light is reported to the police.

Five, the thyristor gating circuit that amplifies through triode is set, works reliably to adapt under the low temperature environment machine.

Following structure accompanying drawing is illustrated embodiment of the present utility model.

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

Fig. 2 is infrared emission of the present utility model, receiving circuit structure chart;

Fig. 3 is the utility model power circuit wherein;

Fig. 4 is power supply indication of the present utility model and control panel schematic diagram.

Embodiment of the present utility model is as follows:

1, power circuit: as shown in Figure 3, form by transformer B, diode D20-D23, three terminal regulator 7805 and electrochemical capacitor C20, C21.12 volts of alternating voltages of the secondary output of B through the D20-D23 rectification, make A hold+15 volts the DC voltage approximately of output voltage V cc over the ground, export stable+5 volt Vcc through C20 filtering again after C21 filtering is by the IC5 voltage stabilizing, supply with the operating voltage of whole watch-dog.

2, as shown in Figure 1, electronic switch and forced resetting on-off circuit: by amplifier integrated circuit A5-A8, resistance R 29-R47, capacitor C 6-C9, soft-touch type button switch K 1-K4 form electronic switching circuit.Form the forced resetting on-off circuit by triode Q4, diode D4, D5, resistance R 22, R23, K1 and K2 control the trigger of left and right electrical machinery of ventilator bidirectional triode thyristor (SCR1 and SCR2) switch respectively, K4 control motor and illuminating lamp drive the forced resetting on-off circuit Q4(automatic or manual function control of delayer (A3, A4)), K3 is the trigger of control illuminating lamp bidirectional triode thyristor (SCR3) switch.

When connecting power supply, the output of amplifier integrated circuit A5-A8 is low level, so luminous tube LED2 is shinny, meanwhile, the Q4 of forced resetting on-off circuit ends, and makes entire circuit be in automatic mode.

When pressing K4, A6 exports high level, and luminous tube LED2 extinguishes, Q4 begins conducting, because the conducting of Q4 causes the anode input of A3 and A4 to approach zero level, because prime does not have input signal, therefore make the output of A3 and A4 still keep low level, the automatic function of this moment disappears.

Press K1, A5 exports high level, triode Q8 conducting, and controllable silicon SCR 1 conducting that also is triggered simultaneously, air exhauster M1 starts working, and luminous tube LED4 is shinny.When pressing K1 once more, the A5 output recovers low level, and Q8 and SCR1 all end, and air exhauster M1 quits work, and luminous tube LED5 extinguishes.Equally, press K2 once more, air exhauster M2 also can quit work, and luminous tube LED4 extinguishes.

Press K3, A7 exports high level, the A6 conducting, and controllable silicon SCR 3 triggering and conducting, illumination lamp ignition, luminous tube LED3 is luminous simultaneously.Press K3 once more, the A7 output low level, Q6 and SCR3 all end, and illuminating lamp is closed, and LED 3 extinguishes.

3, oil smoke monitoring and start delay circuit: form by gas sensor G, amplifier integrated circuit A1, resistance R 1-R7, adjustable resistance W1, diode D1, triode Q1, electrochemical capacitor C1.The output of gas sensor G and R4 and R5 connect to form a bleeder circuit, are connected to the negative input end of A1, by another adjustable voltage division circuit that R1, R2, R3 and W1 form, are connected to the positive input terminal of A1.Connect to form a voltage comparator like this.After the gas sensor preheating, under the situation of no pernicious gas, adjust the W1 in the A1 positive input terminal bleeder circuit, make the positive input voltage ratio negative input end of A1 low, therefore, A1 is output as low level.When harmful gas concentrations such as oil smoke increased, the resistance of G reduced (being that output voltage reduces), makes the negative input end current potential of A1 be lower than positive input terminal, and A1 exports high level.

Triode Q1, resistance R 6, R7, diode D2, capacitor C 1 are formed the start delay circuit, during start, and capacitor C 1 charging, the Q1 conducting makes the positive input terminal of A1 approach zero level, and A1 is output as low level, to guarantee that the relevant circuit of back level can misoperation.Behind the C1 charging certain hour, the base potential of Q1 descends, and Q1 ends, and this moment, A1 and the relevant circuit of back level just entered operate as normal.D2 is after circuit is closed outage, and the electric energy that C1 is stored bleeds off rapidly, the delay time during with the maintenance start.

(4) buzzing alarm and lockout circuit: form by amplifier integrated circuit A2, triode Q2, Q3, resistance R 8-R17, diode D2, buzzing sheet Y, inductor L1, electrochemical capacitor C2, LED 1.Form square-wave generator by A2, R10, R11, R12, C2; About 2KHz oscillator that Q3, L1, Y, R16 and R17 form; Q2, R14, R15 form lockout circuit.Wherein whether square-wave generator work, controlled by the output level of prime observation circuit A1.During the A1 output low level, square-wave generator is not worked, and when A1 output high level, square-wave generator is started working.When square-wave generator was worked, because the effect that discharges and recharges of C2, A2 output level will become low level from high level repeatedly, becomes high level again from low level.Because the variation of A2 output level causes LED1 also can change thereupon.Therefore the 2KHz oscillator promptly is controlled by the output level situation of A1, also is controlled by the output level situation of A2 simultaneously.During A1 output high level, A2 also exports high level, oscillator work, and buzzing sheet sounding, when the A2 output low level, the blocking of oscillator is not worked.

When A3, A5, A6 output low level, Q2 in the buzzer lockout circuit ends, as long as when A3, A5, one of them amplifier output high level of A6, Q2 obtains base bias current and conducting, because the conducting of Q2, make the base stage of Q3 approach zero level, so the 2KHz oscillator is blocked and quit work.

(5) (motor) drives delayer: be made up of amplifier integrated circuit A3, diode D3, D10, D11, electrochemical capacitor C3, resistance R 18-R21.When A1 output high level, the positive input terminal current potential of A3 is than negative input end height, so A3 output high level.The high level of A1 output simultaneously, electric current charges to C3 through D3 and R18, when A1 output recovers low level, because the effect that discharges and recharges of C3 makes the output level of A3 keep certain hour.

(6) (motor) controllable silicon triggering, on-off circuit: form by triode Q7, Q8, diode D8, D9, bidirectional triode thyristor SCR, SCR2, resistance R 50-R53, luminous tube LED4, LED5.During A3 output high level, provide bias current by D10, D11, R50 and R52 to Q7, Q8 base stage respectively, cause Q7, Q8 conducting.Because the conducting of Q7, Q8,, make LED4, LED5 shinny, SCR1 and SCR2 conducting for the trigger electrode of SCR1 and SCR2 provides the loop.

When A5 output high level, provide bias current by D12 and R53 to the base stage of Q8, the Q8 conducting, SCR1 is triggering and conducting also, and LED5 is shinny.Because the buffer action of D11, so Q7 can't obtain not conducting of bias current.Equally, during A6 output high level, provide bias current to the Q7 base stage by D13 and R50, this moment Q7 and SCR2 conducting simultaneously, LED4 is shinny.Because the buffer action of D10, Q8 can not get not conducting of bias current.

(7) infrared transmitter: as shown in Figure 2, form by time-base integrated circuit IC4, triode Q10, infrared emission tube D18, resistance R 62-R65, diode D17, D19, capacitor C 17, C18, C19.Wherein form an about 34KHz pierce circuit of frequency by IC4, C17, C18, D19, R65 and R64, Q10 is the power amplifier of oscillator, and promotes the luminous work of D18, and R63 is the current-limiting resistance of D18.Wherein R62 and C19 play the power filter effect in whole radiating circuit, and D17 plays the signal buffer action, in order to avoid oscillator signal disturbs other circuit.

(8) infrared reception and pre-amplification circuit: form by the preposition frequency-selecting amplification circuit of special infrared reception IC3, infraluminescence pipe D15, triode Q9, diode D16, inductor L2, resistance R 54-R61, capacitor C 10-C16.The 34KHz infrared signal of being made up of IC3, D15, C10-C14, L2, R55-R58 receives selective frequency amplifier circuit, and when D15 received the 34KHz infrared signal, the output of IC3 was promptly exported undersuing (low level).The inverting amplifier circuit of forming by Q9, C15, R59 and R60, when IC3 does not have undersuing at ordinary times, because the base bias current that R59 provides, so Q9 is in conducting state.When IC3 output undersuing, Q9 then is in cut-off state, because ending of Q9 makes the negative pole output high level of D16.Wherein R54, C16 play the power supply filter action in circuit.

(9) ambient light control and illuminating lamp drive delay circuit: be made up of amplifier integrated circuit A4, triode Q5, adjustable resistance W2, photo resistance R61, electrochemical capacitor C4, C5, resistance R 24-R28, diode D6, D7.Wherein R61, W2, C4, Q5, R24 form the ambient light control circuit, and when ambient light was dark, the resistance value of R61 was in high-impedance state.When D16 output high level, electric current provides electric current through W2 to the Q5 base stage, makes the Q5 saturation conduction, at this moment D6 negative pole output low level.When ambient light was higher, the resistance value of R61 was in low resistive state, and the high level of D16 output will land through R61 in a large number.Therefore Q5 can not get enough base currents and the remain off state.When the D6 output low level, the negative input end current potential of A4 is lower than positive input terminal current potential, and A4 promptly exports high level.Meanwhile, D6 charges to C5, and D6 stops output low level.Because the discharge process of C5 makes the negative input end current potential state lower than positive input terminal of A4 keep a period of time, the high level of same A4 output also can keep a period of time.

(10) (illuminating lamp) controllable silicon trigger switch circuit: form by triode Q6, resistance R 48, R49, luminous tube LED3, bidirectional triode thyristor SCR3.During A4 output high level, the base stage of Q6 obtains the bias current conducting by D7, R48.Because the conducting of Q6, for the trigger end of SCR3 provides the loop, SCR3 is touched conducting, and LED3 is luminous simultaneously.Equally, during Q7 output high level, the Q6 base stage obtains bias current by D14, R48, Q6 and SCR3 conducting, and LED3 is shinny.

As shown in Figure 4:

One, indicator lamp and push button function:

A: power supply indication; B: manual indication; C: left motor rotates indication; D: right motor rotates indication; E: built-in lighting light ON/OFF indication.

1,2 automatic/hand state selector buttons; The 3rd, left motor changes/stops selector button; The 4th, right motor changes/stops selector button; The 5th, built-in lighting light ON/OFF selector button.

Two, using method:

(1) earlier this machine is connected the 220V power supply, can see that then power supply indicator is bright, then can carry out following function after the preheating in about 1 minute and select (then not needing preheating) as power cutoff not.

(2) press the duty that " 1 " or " 2 " button can be selected this machine according to user's needs,, represent when the B lamp is bright that this machine is in the Automatic Control duty, represent when the B lamp goes out that this machine is in manual control duty by " 1 " or " 2 " button.

(3) the B lamp is bright is this machine when being in the fully automatic working state:

1. work as the working range that people one enters this machine, not enough as ambient light, then this chance is opened built-in lighting light automatically, and the people closed light automatically in back 30 seconds, enough as ambient light, then above-mentioned action can not occur.

2. opening petroleum gas stove and frying in shallow oil, the carbon monoxide that produces in the cooking process such as stir-fry, waste gas such as oil smoke, this machine are automatic vent.

3. when the fully automatic working state, also can independently manually control the action of motor and the unlatching of light, but must be by " 3,4,5 " button, C, D, E lamp are extinguished after, this machine just can enter the fully automatic working state.

(4) not work be that this machine is when being in manual control to the B lamp.

1. press " 5 " button, but the ON/OFF of selector intraoral illumination light (opening when the E lamp is bright).

2. can select the commentaries on classics of left and right motor/stop (C, motor changeed when the D lamp was bright) by " 3,4 " button.

3. at manual state and left and right sides motor when not working, when the oil smoke of environment, waste gas such as carbon monoxide, oil gas surpass safety standard, and the automatic monitoring system of this machine promptly can be sent the sound and light alarm signal.

Claims (1)

1, a kind of smoke exhaust ventilator automator, form by power circuit, electronic switch and forced resetting on-off circuit, oil smoke monitoring and start delay circuit, buzzer siren and lockout circuit, (motor) driving delayer, the triggering of (motor) controllable silicon, on-off circuit, infrared emission circuit, infrared reception and pre-amplification circuit, the triggering of (illuminating lamp) controllable silicon, on-off circuit, it is characterized in that:

(1) described forced resetting on-off circuit: form by triode Q4, diode D4, D5, resistance R 22, R23, the base stage of Q4 connects the input anode of integrated circuit A8 through resistance R 22, R41, the same ground connection of emitter stage of one end of resistance R 23 and Q4, the other end of R23 connects the base stage of Q4 and the end of R22 respectively, and the colelctor electrode of Q4 connects the input anode of A3 and A2 respectively through diode D4, D5;

(2) described lockout circuit: form by triode Q2, resistance R 14, R15, diode D8, D9, wherein the colelctor electrode of triode Q2 meets buzzing sheet Y, the base stage of Q2 connects the end of D8, D9 respectively through R14, the other end of D8 connects the output of A5 through D12, and the other end of D9 connects the output of A6 through D16, D13;

(3) infrared transmitter: by time-base integrated circuit IC4, triode Q10, infrared transmitting tube D18, resistance R 62-R65, diode D17, D19, capacitor C 17, C18, C19 forms, wherein the base stage of Q10 connects the pin 3 of IC4, the pin 6 of IC4, between 7 and meet R65 and D19, one end of capacitor C 17 is connected with the pin 5 of IC4, one end of capacitor C 18 connects the pin 2 of IC4 and the end of pin 6 and D19 respectively, the same ground connection of the other end of C17 and C18, the colelctor electrode sending and receiving light pipe D18 of Q10, the other end of D18 meets D17 through R63, the other end of D17 connects the Vcc point through R62, the grounded emitter end of Q10;

(4) infrared reception and pre-amplification circuit: by the preposition frequency-selecting amplification circuit of special infrared reception IC3, infrared receiving diode D15, triode Q9, diode D16, inductor L2, resistance R 54-R61, capacitor C 10-C16 forms, wherein, photoelectric receiving tube D15 is connected with the pin 7 of IC3, the pin 6 of IC3 connects the positive pole of capacitor C 13 through R56, the minus earth of C13, the pin 2 of IC3 connects the positive pole of capacitor C 14, the minus earth of C14, inductance L 2 connects the pin 3 of IC3 with capacitor C 11 parallel connections, the pin 4 of IC3 connects an end of capacitor C 12 and resistance R 57 respectively, another termination positive source of C12, the other end earth terminal of R57, the output pin 1 of IC3 connects the base stage of Q9 through resistance R 58, on the base stage of Q9, also be connected to simultaneously an end of resistance R 59 and capacitor C 15 respectively, the colelctor electrode difference connecting resistance R60 of Q9 and the end of diode D16, the end of another termination potentiometer W2 of D16, the other end of W2 meets Ba point and photo resistance R61 respectively, the other end earth terminal of R61.

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