CN2131049Y

CN2131049Y - Temp sensing timer for fume extractor

Info

Publication number: CN2131049Y
Application number: CN 92219234
Authority: CN
Inventors: 李复生; 李南生
Original assignee: Individual
Current assignee: Individual
Priority date: 1992-06-29
Filing date: 1992-06-29
Publication date: 1993-04-28
Anticipated expiration: 2002-06-29

Abstract

The utility model discloses a temperature sensing timer for a fume extractor. The control box of the utility model is installed on a fume extractor and is connected with a temperature sensor through conducting wire. The box body of the control box in which a circuit board is installed is provided with a button. A timing circuit and a temperature sensing circuit, which are arranged on the circuit board and are connected with a timing circuit, are also connected with an alarming and annunciating circuit. The timing circuit is composed of a half minute generator, a frequency divider, and an electronic switch which are connected. The input terminal of the timing circuit is connected with the 50Hz sinusoidal signal of the output terminal of a transformer in the power circuit.

Description

Temp sensing timer for fume extractor

The utility model relates to a kind of temperature-sensitive and timing device that is applicable to kitchen hood.

A kind of kitchen hood is arranged at present, it is except having traditional suction mechanism, also has a cover oil smoke alarm control unit, it is to be formed by connecting by smoke transducer, amplifying circuit and driving circuit, it utilizes smoke transducer to respond to certain density oil smoke or some flammable harmful gases, by the keying of amplifying circuit and driving circuit control suction mechanism.Yet this control device can not adapt to the needs of Modern Family's kitchen operation fully, because cooking to heat up water, family not only needs oil smoke and flammable harmful gas are controlled, but also temperature or time need heat up water to cooking the time control, temperature drift or on the low side and overlong time or too short heating up water to cooking all can be brought adverse influence, and waste energy, even some peril is because effectively control and produce the temperature and time shortage.

The purpose of this utility model is exactly to provide a kind of novel lampblack absorber temperature-sensitive timer for the shortcoming that overcomes prior art, this device should be able to be responded to the temperature of cooking and heating up water, various programs to the kitchen operation are carried out timing alarm, make people plannedly on purpose carry out the kitchen operation or be engaged in other housework or rest, energy savings prevents the generation of mishap; In addition, temperature-sensitive scope or timing range should be able to be regulated selection.Simple in structure, easy to use, should not influence the structure and the use of former lampblack absorber during installation.

The utility model is to adopt following measure to realize its purpose.

The control enclosure that is installed on the lampblack absorber is connected by lead with temperature sensor, is mounted with button on the box body of control enclosure, and circuit board is installed in the box body, and the timing circuit that is connected with power circuit on the circuit board also rings circuit with the news of reporting to the police with temperature-sensitive circuit and is connected.Timing circuit is to be formed by connecting by half a minute generator, frequency divider and electronic switch, and the input end of timing circuit inserts the 50Hz sinusoidal signal of transformer output terminal in the power circuit.Half a minute generator is to be made of 12 grades of binary counter CD4040, and its input end is by the sinusoidal signal of the 50Hz of transformer output terminal in electronic switch and the diode access power circuit, and its frequency division output terminal is connected with the AND circuit that is constituted by a diode.Frequency divider is to be made of seven grades of binary counter CD4024, and its input end is connected with the output terminal of half a minute generator.Electronic switch is to be made of d type flip flop CD4013 and bidirectional analog switch CD4066, forms and gate output circuit by each electronic switch that diode is connected with the output terminal of frequency divider.Temperature-sensitive circuit is to be made of thermistor and variable resistor serial connection.Temperature sensor is exactly a thermistor.It is to be formed by connecting by squegger, audio frequency oscillator, amplifier and loudspeaker that the news of reporting to the police are rung circuit, and squegger and audio frequency oscillator are made of two Sheffer stroke gates and resistance capacitance.

The drawing of accompanying drawing is described as follows:

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

Fig. 2 is a functional-block diagram of the present utility model, and wherein S is a power circuit, and B is half a minute generator, and F is a frequency divider, and D is an electronic switch, and W is a temperature-sensitive circuit, and J rings circuit for the news of reporting to the police;

Fig. 3 is a power circuit diagram;

Fig. 4 is the circuit diagram of half a minute generator;

Fig. 5 is the circuit diagram of frequency divider;

Fig. 6 is the circuit diagram of electronic switch;

Fig. 7 is temperature-sensitive circuit figure;

Fig. 8 rings circuit diagram for the news of reporting to the police;

Fig. 9 is voltage-stabilized power supply circuit figure;

Figure 10 is the utility model complete circuit connection layout.

Below in conjunction with accompanying drawing the utility model is further described.

Referring to Fig. 4, the principle of work of half a minute generator is such: send into a noble potential by the A end during start, pass through capacitor C ₁With resistance D ₉, R ₃To capacitor C ₁Charging is in resistance R ₃Produce a positive pulse, the R of counter CD4040 end is carried out passing through resistance R from clear " zero " ₁Can make capacitor C ₁Discharge rapidly after outage.Send into the sinusoidal signal of 50Hz when input end, at first pass through D ₁The negative half period of pruning is by electronic switch K ₁Send into the CP end of the CD4040 of counter, by its frequency division output terminal Q ₃-Q ₉, Q ₁₁By diode D ₂-D ₈And resistance R ₄The AND circuit of forming just can obtain half a minute pulse output with the addition of above-mentioned fractional frequency signal cycle.This signal triggering rejection gate H simultaneously ₁, make H ₂Output rises to noble potential rapidly, and by diode D ₁₀Send into counter CD4040, make the CD4040 zero clearing and finish the output of half a minute periodic signal.Go round and begin again like this and export the pulsating wave of a half a minute, wherein rejection gate H ₁And H ₂Be CD4001.Frequency divider is to be made of 7 grades of binary counter CD4024, and it is identical with half a minute generator principle from the zero clearing principle, when input end (CP) input half a minute in cycle pulsating wave, and its frequency division output terminal (Q ₂Q ₆) export pulse in 1 fen, pulse in 2 fens, pulse in 4 fens, pulse in 8 fens and 5 groups of signals of pulse in 16 fens respectively, by electronic switch K ₂-K ₆Various combination can be by diode D ₁₂-D ₁₆And resistance R ₇Produce timing signal output in 1-31 minute in the AND circuit of forming, ring the circuit timing alarm thereby trigger the news of reporting to the police.Electronic switch is to be connected to form by d type flip flop CD4013 and bidirectional analog switch CD4066, d type flip flop and resistance R A, RB and capacitor C A form trigger flip-flop, resistance R B and capacitor C A are for starting shooting from clear circuit, when the X end has a high level, the bistable counter-rotating, the Z end rises to noble potential, thereby the control end of trigger switch K is connected K switch.As pressing keys S ₂-S ₆The time, can make light emitting diode D ₁₈-D ₂₃Shinny accordingly, represent corresponding K switch ₂-K ₆Connecting, is timing in 1-31 minute thereby make counter CD4024 by 1,2,4,8,16 weighted arrays.F wherein ₁-F ₆Be inverter circuit CD4069.Temperature sensor (5) is a thermistor Rt, this resistance R t and variable resistor R ₈Serial connection forms temperature-sensitive circuit.Resistance R ₉With voltage stabilizing diode D ₂₄Form voltage-stabilized power supply circuit.When temperature rose to setting value, the resistance of thermistor Rt dropped to certain value, through variable resistor R ₈Dividing potential drop makes rejection gate H ₃Input end rises to hop value, H ₃Be output as low level, if this moment is K switch ₇Closure then makes rejection gate H ₄The output high level, promptly (D) holds and is high level, just triggers the news sound circuit of reporting to the police and sends the sound.If come the signal (V of self-timer ₈) become high level, equally also can make (D) end become high level, trigger news and ring circuit alarm.Rejection gate H ₃, H ₄Be the CD4001 integrated circuit.The control enclosure (3) that is mounted with button (1) on the box body (2) can be installed on the lampblack absorber, and its (3) is connected by lead (4) with temperature sensor (5).The course of work of timing circuit is such.At first press button S after the start ₂-S ₆, make corresponding light emitting diode D ₁₉-D ₂₃Luminous, thus corresponding K switch ₂-K ₆Closure makes counter CD4024 be in 1-31 minute timing standby condition; Pressing button S then ₁, make light emitting diode D ₁₈Shinny, K switch ₁, K ₇, K ₈While is closed, wherein K switch ₁The CP end that makes the reference clock signal of 50Hz send into counter CD4040 picks up counting K switch ₇Make rejection gate H ₄An input end be low level, carry out the preparation of timing and alarming, K switch ₈Closure then makes counter CD4040 and CD4024 zero clearing, to guarantee the accuracy of timing; After treating that timing is finished, rejection gate H ₃Input end obtain high level, make rejection gate H ₄Output terminal also obtain high level, so by Sheffer stroke gate M ₁-M ₄The warning news of forming are rung circuit and are obtained the condition that news are rung, loudspeaker just " too " report to the police.At this moment, pressing button S again ₁, light emitting diode D ₁₈Go out K switch ₁, K ₇, K ₈Disconnect, count pulse promptly no longer is provided, rejection gate one input end is a noble potential, and output terminal is an electronegative potential, makes news ring circuit and loses news and ring condition and stop news and ring.The course of work of temperature-sensitive circuit is such.Pressing button S at first ₁Make K switch ₁Closure when the temperature of thermistor Rt rises to when temperature is set, is provided with temperature T 〉=95 ° as boiling water, and its resistance drops to one regularly, makes rejection gate H ₃One input end is a high level, and these news of reporting to the police are rung circuit alarm; Pressing button S again ₁, make K switch ₁Disconnect, reporting to the police then stops.

The utility model is owing to adopt mu balanced circuit, make entire circuit reliable and stable accurately, timing range and temperature-sensitive scope combination in any, this device is installed on lampblack absorber, can make people leave the kitchen relievedly when cooking and do other thing heating up water, the utility model is simple in structure, and is easy to use, energy savings can prevent the generation of mishap.

Claims

1, a kind of lampblack absorber temperature-sensitive timer, the control enclosure that it is characterized in that being installed on the lampblack absorber is connected by lead with temperature sensor, be mounted with button on the box body of control enclosure, circuit board is installed in the box body, and the timing circuit that is connected with power circuit on the circuit board also rings circuit with the news of reporting to the police with temperature-sensitive circuit and is connected.

2, lampblack absorber temperature-sensitive timer according to claim 1, it is characterized in that described timing circuit is to be formed by connecting by half a minute generator, frequency divider and electronic switch, the input end of timing circuit inserts the 50Hz sinusoidal signal of transformer output terminal in the power circuit.

3, lampblack absorber temperature-sensitive timer according to claim 2, it is characterized in that described half a minute generator is to be made of 12 grades of binary counter CD4040, its input end is by the sinusoidal signal of transformer output terminal 50Hz in electronic switch and the diode access power circuit, and its frequency division output terminal is connected with the AND circuit that is constituted by a diode.

4, lampblack absorber temperature-sensitive timer according to claim 3 is characterized in that described frequency divider is to be made of 7 grades of binary counter CD4024, and its input end is connected with the output terminal of half a minute generator.

5, lampblack absorber temperature-sensitive timer according to claim 4, it is characterized in that described electronic switch is to be made of d type flip flop CD4013 and bidirectional analog switch CD4066, form and gate output circuit by each electronic switch that diode is connected with the output terminal of frequency divider.

6, lampblack absorber temperature-sensitive timer according to claim 1 or 5 is characterized in that described temperature-sensitive circuit is to be formed by thermistor and variable resistor serial connection.

7, lampblack absorber temperature-sensitive timer according to claim 6 is characterized in that described temperature sensor is a thermistor.

8, lampblack absorber temperature-sensitive timer according to claim 7, it is characterized in that it is to be formed by connecting by squegger, audio frequency oscillator, amplifier and loudspeaker that described warning news are rung circuit, and squegger and audio frequency oscillator are made of two Sheffer stroke gates and resistance capacitance.