CN2090525U - Thermometric signaler - Google Patents

Abstract

The utility model relates to a temperature measuring and alarming device which adopts a general-purpose diode or a triode as a temperature sensing probe. A sampling branch for the probe is connected in parallel with a series branch for reference voltage, the sampling output and the voltage amplifying circuits of the former two are connected. The output terminal of the voltage amplifying circuit is connected with an output control circuit. The input terminal of the output control circuit is connected with a pulse oscillating circuit, while the output terminal thereof is connected with a power output circuit via a pulsed filter. The utility model has the advantages of high measuring accuracy and sensitivity, saving power consumption, low cost, simple circuit, good reliability and stability.

Description

Thermometric signaler

The utility model relates to a kind of temperature survey and alarm device thereof.

At present, general medium and low temperature surveying instrument probe adopts thermistor and thermopair mostly, and the former general temperature measurement accuracy is not high, poor repeatability, latter's measuring accuracy are not high yet, and price is more expensive, volume is big, and a lot of thermopair head glass-encapsulated then also are afraid of to bump, hit, fall.They generally only use in commercial production.People adopt semiconductor temperature probe (being commonly called as the temperature-sensitive integrated package) again in recent years, but its price is also high, and tolerance surge voltage impact capacity is very poor, general by the powered battery use, it is only made measuring instrument usually and uses, and not as the equipment that can use for a long time continuously, and supply voltage fluctuates by a relatively large margin and can influence measuring accuracy.

The purpose of this utility model is exactly in order to address the above problem, and a kind of cheapness, the general thermometric indicator that uses are provided.

Technical solution of the present utility model as shown in the figure.

Fig. 1 is the utility model electrical schematic diagram;

Fig. 2 is the partial circuit diagram of the utility model no pulse wave filter.

Such as Fig. 1, the utility model is by probe sampling slip, reference voltage series arm, voltage amplifier circuit, Power supply and filter regulator circuit, pulse oscillation circuit, output control circuit, the pulse bandwidth filtering circuit, power output circuit and negative pressure rectification circuit form, and the probe sampling slip is by resistance R₂, potentiometer W₁, diode BG₃Be composed in series, the reference voltage series arm is by resistance R₄、R ₅, potentiometer W₂、W ₃Be composed in series, voltage amplifier circuit is by voltage comparator JC_1－1、JC _1－2, resistance R₆Form comparator JC_1－1、JC _1－2Also with voltage-stabiliser tube BG₁、BG ₁₀, resistance R₁₂, capacitor C₁Form Power supply and filter regulator circuit, pulse oscillation circuit is by phase inverter G₁、G ₂, resistance R₃, capacitor C₂Form, output control circuit is by phase inverter G₅Input, diode BG₄, resistance R₇、R ₈Form, the pulse bandwidth filtering circuit is by diode BG₇, resistance R₁₀, capacitor C₅With phase inverter G₆Input form phase inverter G₆Output and multiple tube BG₈、BG ₉, resistance R₁₁Form power output circuit, the negative pressure rectification circuit is by diode BG₅、BG ₆, capacitor C₃、C ₄Form. Probe sampling slip two ends and reference voltage series arm two ends also connect, the diode BG in the probe sampling slip₃Positive pole and voltage amplifier circuit in comparator JC_1－1Reverse input end connect JC_1－1Import in the same way potentiometer W in the termination reference voltage series arm₂Sliding contact, JC_1－1Output meet comparator JC_1－2Reverse input end, JC_1－1、JC _1－2Be same voltage comparator integrated package LM393, their positive and negative power end all with Power supply and filter regulator circuit in capacitor C₁Positive and negative electrode and meet C₁Negative pole pass through resistance R₁₂Be connected C with the negative terminal (namely) of power supply Vc₁Positive pole and voltage-stabiliser tube BG₁Positive pole connect BG₁Negative pole connect the anode of power supply Vc, in anode and the resistance R of power supply Vc₁₂With capacitor C₁Between the tie point of negative terminal and meet voltage-stabiliser tube BG₁₀, comparator JC_1－1Output pass through resistance R₆Meet voltage-stabiliser tube BG₁Positive pole, BG₁Positive pole also be connected with the reference voltage series arm with the probe sampling slip and connect in the lump end and is connected, another of pop one's head in sampling slip and reference voltage series arm also meets termination comparator JC_1－2In the same way input. Phase inverter G₁－G ₆Be same hex inverter integrated package 74HCO4, their power positive end all connects the positive pole of power supply Vc, and their power supply negative terminal all meets voltage-stabiliser tube BG₁Positive pole, phase inverter G wherein₁、G ₂And resistance R₃, capacitor C₂Form pulse oscillation circuit, the output of pulse oscillation circuit is by phase inverter G₄Isolation and negative pressure rectification circuit (C₃、C ₄、BG ₅、BG ₆) input connect the output of negative pressure rectification circuit and comparator JC_1－2In the same way input connect. The output of pulse oscillation circuit is also by phase inverter G₃The diode BG of isolation and output control circuit₄Positive pole connect BG₄Negative pole connecting resistance R₇、R ₈Mid point, R₇Another termination power Vc anode, R₈Another termination voltage amplifier circuit in comparator JC_1－2Output, BG₄Negative pole also call out with doorbell or self-checking circuit in resistance R₁An end connect R₁The other end is by button AN₁Ground connection, BG₄Negative pole and phase inverter G₅Input connect G₅Output meet diode BG in the pulse bandwidth filtering circuit₇Positive pole, BG₇Negative pole connect capacitor C₅, resistance R₁₀Mid point, C₅The anode of another termination power Vc, R₁₀Another termination Power supply and the voltage-stabiliser tube BG in the filter regulator circuit₁Positive pole, BG₇Negative pole also with phase inverter G₆Input connect G₆Output by the resistance R in the power output circuit₁₁With multiple tube BG₈、BG ₉Base stage connect multiple tube BG₈、BG ₉Colelctor electrode output connect the end of piezoelectric buzzer YD, the other end ground connection of YD. Resistance R₉Be used for Current Control, its termination voltage-stabiliser tube BG₁Positive pole, another termination comparator JC_1－2Output. Button AN₁, diode BG₂And resistance R₁Form doorbell and call out or self-checking circuit BG₂Negative pole meet button AN₁And resistance R₁Tie point, BG₂Plus earth.

Temperature measurement range of the present utility model is by reference voltage series arm W₂、W ₃、R ₄、R ₅Resistance set, and as with reference to voltage, send the comparator JC of voltage amplifier circuit_1－1In the same way input, do temperature sensor probe with general-purpose diode or triode, sampled signal from the probe sampling slip diode BG₃Positive pole take out, send into comparator JC_1－1Reverse input end, compare with reference voltage, work as JC_1－1In the same way input current potential when being lower than reverse input end, when namely measured temperature does not reach the temperature that sets, JC_1－1Output be conducting state, be low level, because comparator JC_1－2Reverse input end and JC_1－1Output connect, then at JC_1－1Under the turn-on condition, JC_1－2The output cut-off, voltage is through R₇、R ₈To JC_1－2Output, make JC_1－2Output be high level, the diode BG in the output control circuit then₄No-output, buzzer YD does not ring. Simultaneously, voltage is through power switch K₁, resistance R₁₂, voltage-stabiliser tube BG₁With comparator JC_1－1、JC _1－2Consist of the loop, BG₁Two ends form voltage, make phase inverter G₁－G ₆Work, phase inverter G₁、G ₂, resistance R₃, capacitor C₂Form pulse oscillation circuit, it is all the time in running order, through phase inverter G₄Drive negative pressure rectification circuit (BG₅、BG ₆、C ₃、C ₄), offer probe sampling slip, reference voltage series arm and comparator JC_1－2Input biasing, use as high-precision regulated power supply. Here forming high-precision regulated power supply is a performance having utilized voltage comparator LM393, it has very low source current (0.8mA), be not subjected to the impact of supply voltage, it as constant-current source device, the recycling Zener diode is constant this performance of voltage stabilizing value under constant current conditions, has solved the problem of high-precision regulated power supply. The output of pulse oscillation circuit is also by phase inverter G₃To deliver to output control circuit (BG after the oscillator signal isolation₄、R ₇、R ₈、G ₅), as comparator JC_1－2During the output cut-off, BG₄Not conducting, then phase inverter G₅Output is electronegative potential, makes the diode BG in the pulse bandwidth filtering circuit₇Output cut-off, then phase inverter G₆Input is electronegative potential, and output is high potential, thereby makes the multiple tube BG in the power output circuit₈、BG ₉Cut-off, buzzer YD does not send the sound.

As comparer JC _1-1The current potential of input end in the same way when being higher than reverse input end, when promptly measured temperature meets or exceeds the temperature that sets, the potentiometer W in this moment reference voltage series arm ₂Moving point voltage value constant, and the diode BG of probe in the sampling slip ₃The positive terminal magnitude of voltage descends, and is lower than W ₂Moving some potential value, then comparer JC _1-1Output ends, and is high level, and comparer JC _1-2The output conducting is because R ₇, R ₈Series connection, JC _1-2Conducting make it produce voltage drop, diode BG ₄Current return is arranged, then BG ₄Conducting, phase inverter G ₅Just oscillator signal is sent to subordinate, because C in the pulse bandwidth filtering circuit ₅, R ₁₀Time coefficient long, so phase inverter G ₆Input end is high level, and output terminal is low level, complex pipe BG ₈, BG ₉Conducting, hummer YD is work just, sends the alarm signal.

The utility model is made doorbell and is called out or the self check time spent, as power switch K ₁Close JC _1-2Not conducting, (being that temperature measurement circuit is not worked), at this moment resistance R ₁Through AN ₁To ground, at AN ₁When pressing, pulse oscillation circuit starting of oscillation, R ₁Ground connection makes BG in the output control circuit ₄Conducting, then G ₅Pulse output is arranged, make BG ₇Pulse output is also arranged, and C ₅, R ₁₀The pulsed filter time coefficient that constitutes is greater than the time coefficient in oscillating impulse cycle, so G ₆Input end be high level, be output as low level, make complex pipe BG ₈, BG ₉Conducting, hummer YD sends the sound; If K ₁Do not close, and JC _1-2During conducting, do not press AN yet ₁, resistance R ₁Pass through AN ₁Ground connection, electric current is through stabilivolt BG ₁, diode BG ₂, compare JC _1-1, JC _1-2, phase inverter G ₁-G ₆With button AN ₁Constitute the loop, but circuit operate as normal still makes hummer YD send the alarm signal.

The utility model also can save the pulse bandwidth filtering circuit after output control circuit, directly be connected with power output circuit.Specifically connect as Fig. 2 phase inverter G ₅The input end connection constant, its output termination phase inverter G ₆Input end, G ₆Output terminal pass through resistance R ₁₁Meet complex pipe BG in the power output circuit ₈, BG ₉Base stage, BG ₈, BG ₉Collector output connect the end of piezoelectric buzzer YD, YD other end ground connection is at hummer YD two ends and connecting resistance R ₁₃

The utility model adopts good reproducibility, volume is little, sensitivity, the higher semiconductor devices of measuring accuracy are made temperature sensor, and adopt high-precision regulated power supply to guarantee measuring accuracy, temperature-measuring range is at 20 ℃-100 ℃, and its temperature measurement error is ± 2 ℃, and the utility model is being used alternating current and not voltage stabilizing, under the big condition of voltage fluctuation amplitude, its measuring accuracy is constant substantially, can resist the stronger impact of gushing simultaneously, can work long hours, its measuring accuracy and sensitivity are higher, the power consumptive province, price of complete machine is low, and circuit is simple, reliability, good stability, easy to use.The utility model can be used for overtemperature alarm devices such as warehouse, grain depot, various device, fermentation, environmental monitoring, can be used as also that family's water is boiled, meal burns and boil warning device, can be used as fire-alarm at ordinary times.In addition, the utility model also is provided with button, can be used as doorbell calling or self check and uses.

Claims (4)

1, a kind of thermometric indicator, it is made up of probe sampling slip, reference voltage series arm, voltage amplifier circuit, power supply power supply and filter regulator circuit, pulse oscillation circuit, output control circuit, pulse bandwidth filtering circuit, power output circuit and negative pressure rectification circuit, and the sampling slip that it is characterized in that popping one's head in is by resistance R ₂, potentiometer W ₁, diode BG ₃Be composed in series, the reference voltage series arm is by resistance R ₄, R ₅, potentiometer W ₂, W ₃Be composed in series, voltage amplifier circuit is by voltage comparator JC _1-1, JC _1-2, resistance R ₆Form comparer JC _1-1, JC _1-2Also with stabilivolt BG _i, BG _Ic, resistance R ₁₂, capacitor C ₁Form power supply power supply and filter regulator circuit, pulse oscillation circuit is by phase inverter G ₁, G ₂, resistance R ₃, capacitor C ₂Form, output control circuit is by phase inverter G ₅Input end, diode BG ₄, resistance R ₇, R ₈Form, the pulse bandwidth filtering circuit is by diode BG ₇, resistance R ₁₀, capacitor C ₅With phase inverter G ₆Input end is formed, G ₆Output terminal and complex pipe BG ₈, BG ₉, resistance R ₁₁Form power output circuit, the negative pressure rectification circuit is by diode BG ₅, BG ₆, capacitor C ₃, C ₄Form, probe sampling slip two ends and reference voltage series arm two ends also connect, diode BG in the probe sampling slip ₃Positive pole and voltage amplifier circuit in comparer JC _1-1Reverse input end connect JC _1-1Import potentiometer W in the termination reference voltage series arm in the same way ₂Sliding contact, JC _1-1Output meet comparer JC _1-2Reverse input end, JC _1-1, JC _1-2Positive and negative power end all with power supply power supply and filter regulator circuit in capacitor C ₁Positive and negative electrode and meet C ₁Negative pole pass through resistance R ₁₂With power supply V _cNegative terminal (promptly) connect C ₁Positive pole and stabilivolt BG ₁Positive pole connect BG ₁Negative pole meet power supply V _cAnode, at power supply V _cAnode and resistance R ₁₂With capacitor C ₁Between the tie point of negative terminal and meet stabilivolt BG ₁₀, comparer JC _1-1Output terminal pass through resistance R ₆Meet stabilivolt BG ₁Positive pole, BG ₁Positive pole also is connected with the end that connects in the lump of probe sampling slip and reference voltage series arm, another of pop one's head in sampling slip and reference voltage series arm also meets termination comparer JC _1-2Input end in the same way; Phase inverter G ₁-G ₆Power positive end all meet power supply V _cAnode, their power supply negative terminal all meets stabilivolt BG ₁Positive pole, phase inverter G wherein ₁, G ₂And resistance R ₃, capacitor C ₂Form pulse oscillation circuit, its output is by phase inverter G ₄Isolate and negative pressure rectification circuit (BG ₅, BG ₆, C ₃, C ₄) input connect the output of negative pressure rectification circuit and comparer JC _1-2Input end in the same way connect, the output of pulse oscillation circuit is also by phase inverter G ₃Isolate diode BG with output control circuit ₄Positive pole connect BG ₄Negative pole connecting resistance R ₇, R ₈Mid point, R ₇Another termination power V _cAnode, R ₈Another termination voltage amplifier circuit in comparer JC _1-2Output terminal, BG ₄Negative pole also call out with doorbell or self-checking circuit in resistance R ₁One end connects, R ₁The other end is by button AN ₁Ground connection, BG ₄Negative pole and phase inverter G ₅Input end connect G ₅Output meet diode BG in the pulse bandwidth filtering circuit ₇Positive pole, BG ₇Negative pole connect capacitor C ₅, resistance R ₁₀Mid point, C ₅Another termination power V _cAnode, R ₁₀The power supply of another termination power and the stabilivolt BG in the filter regulator circuit ₁Positive pole, BG ₇Negative pole also with phase inverter G ₆Input end connect G ₆Output by the resistance R in the power output circuit ₁₁With complex pipe BG ₈, BG ₉Base stage connect complex pipe BG ₈, BG ₉Collector output connect the end of piezoelectric buzzer YD, the other end ground connection of YD.

2, by the described thermometric indicator of claim 1, it is characterized in that at stabilivolt BG ₁Positive pole and comparer JC _1-2Output terminal between be connected to resistance R ₉

3, by the described thermometric indicator of claim 1, it is characterized in that button AN ₁, diode BG ₂And resistance R ₁Form doorbell and call out or self-checking circuit BG ₂Negative pole meet button AN ₁And resistance R ₁Tie point, BG ₂Plus earth.

4, by the described thermometric indicator of claim 1, it is characterized in that after output control circuit, also can saving the pulse bandwidth filtering circuit, directly be connected phase inverter G with power output circuit ₅The input end connection constant, its output termination phase inverter G ₆Input end, G ₆Output pass through resistance R ₁₁Meet complex pipe BG in the power output circuit ₈, BG ₉Base stage, BG ₈, BG ₉Collector output connect the end of piezoelectric buzzer YD, YD other end ground connection is at hummer YD two ends and connecting resistance R ₁₃

Images