CN2349507Y - Fully automatic controller for direct exhausting type gas water-heater - Google Patents

Abstract

The utility model relates to a fully automatic controller for direct exhausting type gas water heaters, comprising a high-voltage ignition circuit, and a gas electromagnetic switch circuit. The utility model is characterized in that the utility model also comprises an alternating current flame detection circuit which detects the combustion state of a combustor, a thermoelectrical potential detecting comparison circuit which detects the combustion condition of the combustor, an alarm circuit, a single chip computer CPU which respectively receives the signals of the alternating current flame detection circuit and the thermoelectrical potential detecting comparison circuit to control the opening and the closing of the switch circuit of the gas electromagnetic valve and control the high-voltage ignition circuit and the alarm circuit, and a reset circuit. When the water tap is opened, the reset circuit causes the single chip computer CUP to be initialized. The utility model has the advantages that the utility model prevents incomplete combustion and conforms to the national standard of GB6932-94 of domestic gas water heaters, the performance is stable, etc.

Description

Straight-line gas heater device for automatically controlling

The utility model relates to a kind of straight-line gas heater device for automatically controlling.

At present, cause fire in the use of straight-line gas heater, the reason of personal safety accident mainly contains several aspects: one, when water heater used, working environment was bad, atmosphere draught-free, during burner combustion, required oxygen supply is not gone up, and causes the anoxic duty, perhaps water heater stops up heat collector owing to reasons such as heat collector knot charcoals, and fume emission is not smooth, combustion conditions degenerates, imperfect combustion taking place, cause CO content in smoke to exceed standard greatly and push away discharging content, jeopardizes user's safety; Two, water heater because accidental cause causes burner flame-out, causes gas leakage in the work way, jeopardize user's safety and breaking out of fire; Three, because long-time continuous is used the straight-line gas heater, cause that indoor environment worsens, and jeopardizes user's safety and health.When above three kinds of situations occurring, all can not close source of the gas effectively, automatically.

The purpose of this utility model provides a kind of, atmosphere draught-free bad at working environment or because accidental cause causes burner flame-out or because long-time continuous is used under the situations such as causing the indoor environment deterioration straight-line gas heater device for automatically controlling of fuel gas path that can the automatic self-closing gas water heater.

In order to achieve the above object, the utility model is achieved in that and comprises a high-tension ignition circuit; One combustion gas electromagnetic switch circuit; It is characterized in that: it comprises that also one detects the interchange flame detection circuit of the fired state of burner; One thermoelectrical potential that detects the combustion conditions of burner detects comparison circuit; Warning circuit; One receives the singlechip CPU that opens or closes, controls high-tension ignition circuit and warning circuit that the signal that exchanges flame detection circuit and thermoelectrical potential detection comparison circuit removes to control the gas electromagnetic valve on-off circuit respectively respectively; One reset circuit, when water is sincere when opening, reset circuit makes the singlechip CPU initialization.Exchange flame detection circuit and comprise resistance R 1-R4, capacitor C 1-C2, diode D1-D3, transformer B2, triode N1, comparator IC1 and flame feedback electrode; Resistance R 1, diode D3, triode N1 and transformer B2 constitute oscillating circuit, flame feedback electrode F is connected to the secondary end of transformer B2 by resistance R 4, the secondary other end of transformer B2 connects the inverting input of comparator IC1, the positive input end grounding of IC1 by resistance R 3.Thermoelectrical potential detects comparison circuit and comprises resistance R 6, R8, R10, R18, capacitor C 3, C4, C9, diode Z1, comparator IC2, thermocouple E1 and secondary thermocouple E2; Thermocouple E1, the anti-phase serial connection of secondary thermocouple E2, its serial connection back one end connects the normal phase input end of comparator IC2, other end ground connection by resistance R 18; The reverse inter-input-ing ending grounding of comparator IC1.The model of singlechip CPU is WJ-001515; Its 5th pin connects the output of comparator IC2, and the 6th pin connects the output of comparator IC2, and the 9th pin, the tenth pin connect two inputs of gas electromagnetic valve on-off circuit respectively; The 12 pin connects the input of high-tension ignition circuit; The 15 pin circuit taking alarm.

The utility model compared with prior art has following advantage:

1, prevents that the imperfect combustion function from meeting GB6932-94 domestic gas-fired water heater national standard, stable performance;

2, energy timing shutdown function, it is 20 ± 2 minutes or 30 ± 2 minutes that timing can be selected (20 minutes or 30 minutes) timing accuracy;

3, quick extinguish protection function, operating time of protection≤2 second (other form flame-out protection device such as thermojunction type 〉=20 second);

4, be 10 ± 2 seconds the duration of ignition, can stop igniting when kindling a fire automatically, saves the loss of power.

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

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

Fig. 3 is the block diagram of singlechip CPU.

Below in conjunction with drawings and Examples the utility model is done further detailed description:

As shown in Figure 1, comprise a high-tension ignition circuit (5); One combustion gas electromagnetic switch circuit (7); One detects the interchange flame detection circuit (1) of the fired state of burner; One thermoelectrical potential that detects the combustion conditions of burner detects comparison circuit (2); Warning circuit (6); One receives the singlechip CPU (4) that opens or closes, controls high-tension ignition circuit (5) and warning circuit (6) that the signal that exchanges flame detection circuit (1) and thermoelectrical potential detection comparison circuit (2) removes to control gas electromagnetic valve on-off circuit (7) respectively respectively; One reset circuit (3), when water is sincere when opening, reset circuit (3) makes single-chip microcomputer CUP (4) initialization.Shown in Fig. 2,3, exchange flame detection circuit (1) and comprise resistance R 1-R4, capacitor C 1-C2, diode D1-D3, transformer B2, triode N1, comparator IC1 and flame feedback electrode F; Resistance R 1, diode D3, triode N1 and transformer B2 constitute oscillating circuit, flame feedback electrode F is connected to the secondary end of transformer B2 by resistance G4, the secondary other end of transformer B2 connects the inverting input of comparator IC1, the positive input end grounding of IC1 by resistance R 3.Thermoelectrical potential detects comparison circuit (2) and comprises resistance R 6, R8, R10, R18, capacitor C 3, C4, C9, diode Z1, comparator IC2, thermocouple and secondary thermocouple; Thermocouple, the anti-phase serial connection of secondary thermocouple, its serial connection back one end connects the normal phase input end of comparator IC2, other end ground connection by resistance E18; The reverse inter-input-ing ending grounding of comparator IC2.Reset circuit (3) comprises resistance R 7, R11, capacitor C 5 and diode D4.The model of singlechip CPU (4) is WJ-001515; Its 5th pin connects the output of comparator IC1, and the 6th pin connects the output of comparator IC2, and the 12 pin, the tenth pin connect two inputs of combustion gas electromagnetic switch circuit respectively; The 12 pin connects the input of high-tension ignition circuit (5); The 15 pin circuit taking alarm (6).High-tension ignition circuit (5) comprises triode P1, N2, transformer B1, controllable silicon T, diode D5, D8, Zener diode Z2, resistance R 5, R13, R14, R15, R16, capacitor C 7, C8, C14 and high-voltage ignition coil B3.Gas electromagnetic valve on-off circuit (7) comprises triode P2, P3, pull-in winding L1-1, hold-in winding L1-2, resistance R 16, R17, capacitor C 13, diode D6, D7.When sincere opening, Water operated switch gear normally opened contact closure, singlechip CPU powers on, and its 3rd pin resets and initialization by reset circuit (3), and its 12nd pin C3=0 exports ignition signal.Element R5, R14, R15, P1, N2, C7, B1 form an oscillator circuit, B1 time level more than 100 volt voltages give capacitor C 8 chargings by diode D5, trigger controllable silicon T conducting by R19, Z2, C14, capacitor C 8 discharges, produce the high-tension ignition of volt more than 10,000 by high-voltage ignition coil B3, time-delay 0.5S in the igniting beginning, single-chip microcomputer the 10th pin C1=0, P2 conducting, magnetic valve pull-in winding L1-1 energising, the 9th pin C=0, make the P3 conducting, magnetic valve hold-in winding L1-2 energising is behind 0.4S, its the 10th pin C=1 ends P2, pull-in winding L1-1 outage.Element R1, D3, N1, B2 are oscillator circuits, B2 time level produces one more than 100 volt voltage, the resistance R 4 flame feedback electrode of starting to exchange fire, after handling the detected flare up fire of flame feedback electrode F, comparator IC1 is input to the 5th pin of singlechip CPU, when burner catches fire, by rectified action to flame, comparator IC1 is input as negative voltage, be output as high voltage, the 5th pin D1=1 of singlechip CPU, singlechip CPU continues to keep the 9th pin C0=0 according to its 12nd pin of this signal C3=1, makes water heater enter the normal combustion state.If do not catch fire from the continuous 10S burner of igniting beginning, singlechip CPU the 9th pin C0=1 ends P3, and gas electromagnetic valve is closed in hold-in winding L1-2 outage, stops water heater working, its 15th pin B2 output alarm signal.In the water heater course of normal operation; if burner meets accident flame-out; it is resistance R 4 shorted to earths or open circuit that the flame feedback electrode is surveyed less than flame; the end of oppisite phase voltage of comparator IC1 is positive voltage; the 5th pin D1=1 of singlechip CPU, its 9th pin CO=1 output makes hold-in winding L1-2 outage; close gas electromagnetic valve, realize extinguish protection function and output alarm signal.This circuit also has the ground protection function, promptly works as feedback electrode and bumps ground (water tank and burner), and singlechip CPU all can stop water heater working, with protection user safety.First and second thermocouple E1, the anti-phase serial connection input voltage of E2 Δ V are input to the normal phase input end of comparator IC2, its predetermined voltage is 12MV, during the water heater operate as normal, input voltage be Δ V≤-12MV, the normal phase input end voltage of comparator IC2 is negative voltage, is output as 0V, i.e. single-chip microcomputer the 11st pin D2=0, the 9th pin C0=0 output, water heater continues operate as normal.When beginning to have lighted a fire after 503, singlechip CPU constantly detects the signal of the 6th pin D2, when water heater generation imperfect combustion, and input voltage Δ V＞-12V, the positive input voltage of IC2 is a positive voltage, be output as high level, the 6th pin D2=1 of singlechip CPU, singlechip CPU the 9th pin C0=1 output, make hold-in winding L1-2 outage, close gas electromagnetic valve, prevent imperfect combustion, simultaneously the B2 output alarm signal.When singlechip CPU the 7th pin D3=1, water heater continuous operation 20 minutes, singlechip CPU is exported C0=1 by timing routine, closes gas electromagnetic valve, realizes the timing shutdown function, exports cue simultaneously, notifies the user to note ventilating and safety.When D3=0, the water heater timing shutdown time is 30 minutes.Thermocouple and feedback electrode are installed on the burner in the utility model, and the secondary thermocouple is installed on the water tank of water heater.

Claims (4)

1, a kind of straight-line gas heater device for automatically controlling comprises a high-tension ignition circuit; One combustion gas electromagnetic switch circuit; It is characterized in that: it comprises that also one detects the interchange flame detection circuit (1) of the fired state of burner; One thermoelectrical potential that detects the combustion conditions of burner detects comparison circuit (2); Warning circuit (6); One receives the singlechip CPU (4) that opens or closes, controls high-tension ignition circuit (5) and warning circuit (6) that the signal that exchanges flame detection circuit (1) and thermoelectrical potential detection comparison circuit (2) removes to control gas electromagnetic valve on-off circuit (7) respectively respectively; One reset circuit (3), when water is sincere when opening, reset circuit (3) makes singlechip CPU (4) initialization.

2, straight-line gas heater device for automatically controlling according to claim 1 is characterized in that: exchange flame detection circuit (1) and comprise resistance R 1-R4, capacitor C 1-C2, diode D1-D3, transformer B2, triode N1, comparator IC1 and flame feedback electrode F; Resistance R 1, diode D3, triode N1 and transformer B2 constitute oscillating circuit, the flame feedback electrode is connected to the secondary end of transformer B2 by resistance R 4, the secondary other end of transformer B2 meets the inverting input IC2 of comparator IC1, the positive input end grounding of IC1 by resistance R 3.

3, straight-line gas heater device for automatically controlling according to claim 1, it is characterized in that: thermoelectrical potential detects comparison circuit (2) and comprises resistance R 6, R8, R10, R18, capacitor C 3, C4, C9, diode Z1, comparator IC2, thermocouple E1 and secondary thermocouple E2; Thermocouple E1, the anti-phase serial connection of secondary thermocouple E2, its serial connection back one end connects the normal phase input end of comparator IC2, an end ground connection by resistance R 18; The reverse inter-input-ing ending grounding of comparator IC2.

4, straight-line gas heater device for automatically controlling according to claim 1, it is characterized in that: the model of singlechip CPU (4) is WJ-001515; Its 5th pin connects the output of comparator IC2, and the 6th pin connects the output of comparator IC3, and the 12 pin, the tenth pin connect two inputs of combustion gas electromagnetic switch circuit respectively; The 12 pin connects the input of high-tension ignition circuit (5); The 15 pin circuit taking alarm (6).

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