CN202648829U

CN202648829U - Water temperature monitoring device

Info

Publication number: CN202648829U
Application number: CN 201220336626
Authority: CN
Inventors: 傅碧辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-07-12
Filing date: 2012-07-12
Publication date: 2013-01-02
Anticipated expiration: 2022-07-12

Abstract

The utility model relates to a water temperature monitoring device. The water temperature monitoring device comprises a temperature sensor circuit and a single-chip microcomputer control circuit, wherein output signals of the temperature sensor circuit are transmitted to the single-chip microcomputer control circuit through a comparator circuit. Output signals of the single-chip microcomputer control circuit are controlled and transmitted to a carrier signal phase locked circuit, and output signals of the carrier signal phase locked circuit are transmitted to a carrier signal decoding circuit through a frequency selective amplifier circuit. According to the water temperature monitoring device, a thermistor is utilized as a temperature sensor, the thermistor and a time base integrated circuit form an alarm circuit together, and the alarm circuit can be controlled automatically within a certain temperature range; and when water temperature of food is too high or too low, after the judgment of the single-chip microcomputer, the result of the judgment is transmitted to a carrier host through carrier signals, an operator on duty can reach the site and handle the situation, and the problem that the life of the food is affected due to water temperature problem is avoided.

Description

A kind of water temperature supervising device

Technical field

The utility model relates to a kind of supervising device, particularly be a kind of water temperature supervising device.

Background technology

Food processing factory is extremely strict to food requirement to water temperature in process, will shorten the life-span of food during excess Temperature.

The utility model content

The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of water temperature supervising device is provided.

The technical scheme that its technical matters that solves the utility model adopts is: a kind of water temperature supervising device, comprise temperature sensor circuit and single chip machine controlling circuit, the output signal of described temperature sensor circuit transfers to single chip machine controlling circuit through comparator circuit, the output signal control of described single chip machine controlling circuit is sent to the carrier signal phase lock circuitry, and the output signal of described carrier signal phase lock circuitry sends to the carrier signal decoding scheme through the frequency-selecting amplifier circuit.

Preferably, described temperature sensor circuit adopts 2k Ω negative tempperature coefficient thermistor Rt as temperature sensor, and the output terminal of described thermistor Rt is connected with divider resistance R1, R2.

Preferably, described comparator circuit adopts NE555 time base circuit IC2, and the output terminal of described NE555 time base circuit IC2 is connected with heated condition pilot lamp LED1, LED2.

Preferably, described carrier signal phase lock circuitry is made of LM567 tone decoder U1 and peripheral electric capacity 2C1, resistance 2R1, resistance 2R2 thereof.

Preferably, described frequency-selecting amplifier circuit is made of elementary L1, electric capacity 2C2, the capacitor 2C3 of triode VT1, audio-frequency transformer (AFT) T, and is coupled to electric wire to carrier signal decoding scheme transmission data-signal by secondary L2, the electric capacity 2C4 of audio-frequency transformer (AFT) T.

Preferably, described carrier signal decoding scheme is made of the audio-frequency transformer (AFT) T1, LM567 ATD U2, triode VT2 and the LED that connect successively.

By adopting above-mentioned technical scheme, the beneficial effects of the utility model are: the utility model adopts thermistor to make temperature sensor, consisted of the warning circuit of the automatic control that in certain temperature range, keeps with time-base integrated circuit, when the food water temperature over-high or cross when low, after single-chip microcomputer is judged, transfer to the carrier wave main frame by carrier signal, operator on duty's processing of can reaching the spot avoids affecting because of the water temperature problem life-span of food.

Description of drawings

Fig. 1 is frame assumption diagram of the present utility model;

Fig. 2 is circuit theory diagrams of the present utility model.

Embodiment

As shown in Figure 1 and Figure 2, a kind of water temperature supervising device of the present utility model, comprise temperature sensor circuit 1 and single chip machine controlling circuit 2, the output signal of described temperature sensor circuit 1 transfers to single chip machine controlling circuit 2 through comparator circuit 11, the output signal control of described single chip machine controlling circuit 2 is sent to carrier signal phase lock circuitry 21, and the output signal of described carrier signal phase lock circuitry 21 sends to carrier signal decoding scheme 23 through frequency-selecting amplifier circuit 22.

Described temperature sensor circuit 1 adopts 2k Ω negative tempperature coefficient thermistor Rt as temperature sensor, the output terminal of described thermistor Rt is connected with divider resistance R1, R2, described comparator circuit 11 adopts NE555 time base circuit IC2, the output terminal of described NE555 time base circuit IC2 is connected with heated condition pilot lamp LED1, LED2, LED1 goes out, and the bright expression of LED2 is heated.

When water temperature is low, the resistance of thermistor Rt is higher, resistance R 1, the dividing potential drop of R2 and thermistor Rt, make A point current potential be lower than 1/3Vcc, therefore, NE555 time base circuit IC2 internal circuit upset output high level, the LED2 green indicating lamp is luminous, and pilot lamp LED1 extinguishes, the 3rd pin output high level signal of NE555 time base circuit IC2, the 35th pin I/O end that is input to single-chip microcomputer IC1 through resistance R 6 current limlitings also is high level state, after the comprehensive judgement of single-chip microcomputer IC1 internal processes, by LM567 tone decoder U1 and peripheral electric capacity 2C1 thereof, resistance 2R1, resistance 2R2 consists of carrier signal phase lock circuitry 21, and its oscillation frequency is by electric capacity 2C1, the parameter of resistance 2R1 determines that carrier frequency is adjusted in the 150-300KHZ scope.Elementary L1, electric capacity 2C2, capacitor 2C3 by triode VT1, audio-frequency transformer (AFT) T consist of frequency-selecting amplifier circuit 22, the 25th pin output high level signal by single-chip microcomputer IC1, make LM567 tone decoder U1 obtain working power, LM567 tone decoder U1 starts working, be coupled on local telephone network speaking wire or the AC network AC220V power lead and send by secondary L2, the electric capacity 2C4 of audio-frequency transformer (AFT) T, send data-signal to the carrier wave main frame.

Described carrier signal decoding scheme 23 is by the audio-frequency transformer (AFT) T1 that connects successively, LM567 ATD U2, triode VT2 and LED consist of, resistance 1R1, the time constant of electric capacity 1C5 network has determined the voltage controlled oscillator of LM567 ATD U2, when the carrier wave extension set sends 150-300KHZ carrier wave command signal to main frame, through electric capacity 1C1, audio-frequency transformer (AFT) T1 is coupled to the secondary L3 of audio-frequency transformer (AFT) T, its secondary L3, electric capacity 1C2, electric capacity 1C3 forms a carrier wave frequency selection network, signal after the frequency-selecting is coupled to the 3rd pin signal input part of LM567 ATD U2 through electric capacity 1C4, after LM567 ATD U2 decoding, by its 8th pin output terminal output low level, make triode VT2 conducting, LED is lighted, received the carrier data signal of extension set, current water temperature is excessively low, the reply water temp. heating.

When being raised to the upper of permission, water temperature prescribes a time limit, thermistor Rt resistance becomes lower, A point potential rise then, make the upset of NE555 time base circuit IC2 internal circuit, its the 3rd pin output low level, the luminous indication of LED1 red led, pilot lamp LED2 extinguishes, the 35th pin I/O end that is input to single-chip microcomputer IC1 through resistance R 6 current limlitings also is low level state, after the comprehensive judgement of single-chip microcomputer IC1 internal processes, the 25th pin output high level signal by single-chip microcomputer IC1, make LM567 tone decoder U1 obtain working power, LM567 tone decoder U1 starts working, secondary L2 by audio-frequency transformer (AFT) T, electric capacity 2C4 is coupled on local telephone network speaking wire or the AC network AC220V power lead and sends, send data-signal to the carrier wave main frame, through electric capacity 1C1, audio-frequency transformer (AFT) T1 is coupled to the secondary L3 of audio-frequency transformer (AFT) T, its secondary L3, electric capacity 1C2, electric capacity 1C3 forms a carrier wave frequency selection network, signal after the frequency-selecting is coupled to the 3rd pin signal input part of LM567 ATD U2 through electric capacity 1C4, after LM567 ATD U2 decoding, by its 8th pin output terminal output low level, make triode VT2 conducting, LED is lighted, received the carrier data signal of extension set, when current water temperature is up to standard, should stop water temp. heating.

Above-described only is a preferred embodiment of the present utility model, can not limit the scope that the utility model is implemented, and every equalization of doing according to the utility model claim changes and decorates, and all should still belong in the scope that the utility model contains.

Claims

1. water temperature supervising device, it is characterized in that: comprise temperature sensor circuit (1) and single chip machine controlling circuit (2), the output signal of described temperature sensor circuit (1) transfers to single chip machine controlling circuit (2) through comparator circuit (11), the output signal control of described single chip machine controlling circuit (2) is sent to carrier signal phase lock circuitry (21), and the output signal of described carrier signal phase lock circuitry (21) sends to carrier signal decoding scheme (23) through frequency-selecting amplifier circuit (22).

2. water temperature supervising device according to claim 1 is characterized in that: described temperature sensor circuit (1) adopts 2k Ω negative tempperature coefficient thermistor Rt as temperature sensor, and the output terminal of described thermistor Rt is connected with divider resistance R1, R2.

3. water temperature supervising device according to claim 1 and 2 is characterized in that: described comparator circuit (11) adopts NE555 time base circuit IC2, and the output terminal of described NE555 time base circuit IC2 is connected with heated condition pilot lamp LED1, LED2.

4. water temperature supervising device according to claim 1 is characterized in that: described carrier signal phase lock circuitry (21) is made of LM567 tone decoder U1 and peripheral electric capacity 2C1, resistance 2R1, resistance 2R2 thereof.

5. water temperature supervising device according to claim 1, it is characterized in that: described frequency-selecting amplifier circuit (22) is made of elementary L1, electric capacity 2C2, the capacitor 2C3 of triode VT1, audio-frequency transformer (AFT) T, and is coupled to electric wire to carrier signal decoding scheme (23) transmission data-signal by secondary L2, the electric capacity 2C4 of audio-frequency transformer (AFT) T.

6. water temperature supervising device according to claim 1 or 5, it is characterized in that: described carrier signal decoding scheme (23) is made of the audio-frequency transformer (AFT) T1, LM567 ATD U2, triode VT2 and the LED that connect successively.