CN2370298Y

CN2370298Y - Pulse igniting controller of double needle flame detection

Info

Publication number: CN2370298Y
Application number: CN 99235878
Authority: CN
Inventors: 卢楚鹏
Original assignee: WANHE ENTERPRISE GROUP CO SHUNDE CITY
Current assignee: WANHE ENTERPRISE GROUP CO SHUNDE CITY
Priority date: 1999-04-26
Filing date: 1999-04-26
Publication date: 2000-03-22
Anticipated expiration: 2009-04-26

Abstract

The utility model relates to a pulse igniting controller of double needle flame detection, which is used in gas water heaters. The utility model comprises a central processing unit, signal detection circuits and driving circuits, wherein, the input terminals of the signal detection circuits are respectively connected with flame needles A, B which are arranged in a water heater, the output terminals of the signal detection circuits are both connected with the central processing unit, the input terminals of the driving circuits are connected with the central processing unit, and the output terminals of the driving circuits are respectively connected with an igniting needle arranged in the water heater and a gas electromagnetic valve. The utility model adopts the structure of double needle flame detection, and thereby, not only a water heater has high reliability and high sensitivity for the protection of incomplete combustion, but also the success ratio of one-time ignition is high. The utility model also has the advantages of simple technology, convenient adjustment, and low cost. The utility model provides the pulse igniting controller of double needle flame detection, which has convenience, practicality, and superior performance.

Description

The pulse firing controller that crosspointer flame detects

The utility model is the pulse firing controller that a kind of crosspointer flame that is used for gas heater detects, and belongs to the renovation technique of pulse firing controller.

Existing pulse firing controller; its flame detection circuit is to adopt thermocouple to detect a bit; some is to adopt single needle (flame pin) direct current to detect or single needle (flame pin) interchange detection; also some is to adopt the flame pin; thermocouple is mixed to be detected; to not considering the gas heater of " imperfect combustion protection " problem; use above-mentioned testing circuit all passable; but requirement according to GB6932-1994; the straight-line water heater must have the function of imperfect combustion protection; and adopt above-mentioned flame detection circuit; on the problem of " imperfect combustion protection "; still exist jejune factor at present; qualification rate is not high; this mainly is because flame itself is a kind of poor stability; discreteness is big; be subject to the chemical phenomenon of several factors influence, adopt above-mentioned flame detection circuit, its one side seizure easily qualitatively; but, not the part nothing the matter just then because of the imperfect combustion protection relates to its quantitative one side.

The purpose of this utility model is to consider the problems referred to above and a kind of imperfect combustion protection reliability height, highly sensitive is provided, and the pulse firing controller that detects of also higher crosspointer flame of ignition success rate.

Theory diagram of the present utility model as shown in drawings, include CPU (1), signal deteching circuit (2,3), drive circuit (4,5), wherein the input of signal deteching circuit (2,3) is connected with flame pin A, B in the water heater respectively, output all is connected with CPU (1), the input of drive circuit (4) is connected with CPU (1), and output is connected with igniting pin in the water heater; The input of drive circuit (5) is connected with CPU (1), and output is connected with gas electromagnetic valve.

Describe concrete structure of the present utility model in detail below in conjunction with embodiment:

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

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

Embodiment:

Theory diagram of the present utility model as shown in Figure 1, include CPU (1), signal deteching circuit (2,3), drive circuit (4,5), wherein the input of signal deteching circuit (2,3) is connected with flame pin A, B in the water heater respectively, output all is connected with CPU (1), the input of drive circuit (4) is connected with CPU (1), and output is connected with igniting pin in the water heater; The input of drive circuit (5) is connected with CPU (1), and output is connected with gas electromagnetic valve.Wherein flame pin A is the bending pin, and flame pin B is straight shape pin.Above-mentioned CPU (1) includes single-chip microcomputer IC1 and peripheral cell capacitor C 2 thereof, CX1, CX2, crystal oscillator X, signal deteching circuit (2) includes triode BG2 and peripheral cell resistance R 12 thereof, R16, R18, capacitor C 6, C8, signal deteching circuit (3) includes triode BG6 and peripheral cell resistance R 20 thereof, R21, R22, capacitor C 13, C14, drive circuit (4) includes triode BG3, BG4 and peripheral cell resistance R 13 thereof, R14, drive circuit (5) includes triode BG5, BG1, transformer T1, T2, high voltage package E1 and peripheral cell resistance R 1 thereof, R2, R3, diode D1, D2, D3, D8, capacitor C 1, C3, controllable silicon SCR, wherein the base stage of BG2 is connected with flame pin A by resistance R 18 and reaches and resistance R 16, one end of capacitor C 8 connects, the emitter stage of BG2 and resistance R 16, the connection of capacitor C 8 other ends reaches and BG3, BG4, BG5, the emitter stage of BG6 connects, and be connected with the interface L1 of IC1 by capacitor C 7, the colelctor electrode of BG2 passes through by resistance R 12, the parallel circuit ground connection that capacitor C 6 is formed; The base stage of triode BG6 is connected with flame pin B by resistance R 21 and is connected with an end of resistance R 20, capacitor C 13, the emitter stage of BG6 is connected with the other end of resistance R 20, capacitor C 13, and the colelctor electrode of BG6 is connected with the pin L4 of IC1 and the parallel circuit ground connection by being made up of resistance R 22, capacitor C 14; The base stage of triode BG3 is connected with the interface L1 of IC1 by resistance R 13, and the colelctor electrode of BG3 is connected with the coil LA that keeps of gas electromagnetic valve, and the two ends of LA are connected with diode D7; The base stage of triode BG4 is connected with the interface L0 of IC1 by resistance R 14, and the colelctor electrode of BG4 is connected with the coil LB that keeps of gas electromagnetic valve, and the two ends of LB are connected with diode D6, the equal ground connection of the other end of LA, LB; The base stage of BG5 is connected with the interface K0 of IC1 by resistance R 15, the colelctor electrode of BG5 is connected with the primary coil contact 6 of transformer T1, the base stage of BG1 is connected with an end of resistance R 1, the negative pole of D8 respectively, the other end of R1 is connected with the primary coil contact 7 of T1, the positive pole of D8 is connected and ground connection with the igniting pin, the emitter stage of BG1 is connected and ground connection with the igniting pin, and the colelctor electrode of BG1 is connected with the primary coil contact 5 of T2, and the contact 6 of T1 is connected with the contact 4 of T2; One end of the primary coil of high voltage package E1 is connected with the secondary coil contact 3 of T2, the other end of the primary coil of E1 is connected with the secondary coil contact 1 of T1 by capacitor C 1, diode D2, the positive and negative electrode of controllable silicon SCR, resistance R 2 are connected between the contact 3 of the negative pole of diode D2 and T2, diode D2 is connected the two ends of the primary coil of E1, on the interface L2 of the trigger end of SCR by capacitor C 3, resistance R 3 and IC1.In addition; for realizing other defencive function, make water heater more safe and reliable, above-mentioned CPU (1) also is connected with stops up thermocouple testing circuit (6); the input that stops up thermocouple testing circuit (6) is connected with thermocouple, and output is connected with CPU (1).Above-mentioned obstruction thermocouple testing circuit (6) includes ic chip 2A, IC2B, resistance R 4～R10, capacitor C 4, C5, diode D4, D5, wherein the positive input terminal of IC2A is connected with the end of resistance R 5, R4, negative input end is connected with an end of resistance R 6, and output is connected with the interface K2 of IC1 and by capacitor C 4 ground connection; The positive input terminal of IC2B is connected with an end of resistance R 10, the other end of R10 is connected with an end of resistance R 8, the other end of R8 is connected with resistance R 5, the negative input end of IC2B is connected with an end and the thermocouple of resistance R 9 respectively, the other end ground connection of thermocouple, the end of R7, the minus earth of D5, the positive pole of D5 is connected with R10, R8, and the output of IC2B is connected with the pin I0 of IC1 by capacitor C 5 ground connection reaching.Wherein IC2A, IC2B are LM393; In addition, CPU (1) also is connected with water-control switch testing circuit (7), the input of water-control switch testing circuit (7) is connected with water-control switch SW1, output is connected with CPU (1), above-mentioned water-control switch testing circuit (7) includes resistance R 11, R17, capacitor C 10, C11, C12, wherein an end of capacitor C 10, C11, C12, resistance R 17 is connected with the interface G5 of IC1 and is connected with water-control switch SW1 by power supply B2, and be connected the equal ground connection of the other end of C10, C11, C12, R17 with the interface L3 of IC1 by resistance R 11.In order to see the duty of water heater more intuitively, be connected with light emitting diode L8 between the emitter stage of above-mentioned resistance R 11 and BG2, BG6.

When the utility model uses, flame pin A is installed in the more stable place of flame, flame pin B is easy to generate from flame when being installed in imperfect combustion, take off the place of fire, with the corresponding interface in the utility model respectively with flame pin A, B, the igniting pin, thermocouple, water-control switch connects, open the taps and the power switch of water heater, then its water-control switch SW1 connects, and the power connection of IC1, then at first self check of IC1, flame detection pin A, whether short circuit (is passed through L4 to B, 14 interfaces), enough whether cell voltage (by the K2 interface), stop up thermocouple whether open circuit (by the I0 interface) etc., after self check is passed through, IC1 is by K0 interface output pulse firing signal, at this moment the K0 interface is a low level, the BG5 conducting, oscillation transformer T1 work (self-oscillation), the alternating voltage that is produced is through the D2 rectification, charge to C1, the L2 interface output-pwm signal of IC1, trigger the controllable silicon SCR conducting, the C1 discharge, discharge current produces induced electromotive force through the primary coil of high voltage package E1, produces high pressure up to 15000V at the secondary coil of high voltage package E1, carries out spark ignition by the igniting pin.IC1 produced behind the pulse firing signal 0.5 second, the L0 of IC1, the L1 interface produces low level simultaneously, BG3, the BG4 conducting, the actuating coil LA of gas electromagnetic valve, keeping coil LB opens, wherein actuating coil LA opened after 0.5 second, BG4 turn-offs (high level of the I0 interface of IC1 output at this moment), gas electromagnetic valve relies on keeps coil LB maintenance open mode, after 2 seconds, IC1 scanning flame pin A, signal on the B is (by the L4 of IC1, the I4 interface), if water heater is lighted a fire successfully, flame pin A, B has flame current to pass through over the ground, BG2, the BG6 conducting, I4 on the IC1, level on the L4 interface is a high level, as long as I4, any one is a high level in the L4 interface, and then IC1 scans flare up fire, the pulse signal of the K0 interface output among the IC1 continues to stop after 2 seconds, and gas electromagnetic valve is kept coil and stayed open the normal combustion of state with the maintaining heat hydrophone.After lighting a fire successfully, IC1 is by the signal of its I4, L4 interface continuation scanning flame pin A, B, with the follow-up operate as normal of different situations (situation as shown in the table) decision water heater of flame pin A, the last signal of B.

Flame pin A	Flame pin B	Judge
Flame pin A	Flame pin B	Judge	There is not fire	There is not fire	Accident extinguishing
There is not fire	Fire is arranged	Normally	There is not fire	There is not fire	Accident extinguishing
There is not fire	Fire is arranged	Normally	Fire is arranged	There is not fire	Also completing combustion (after 1 minute)
Fire is arranged	Fire is arranged	Normally	Fire is arranged	There is not fire	Also completing combustion (after 1 minute)

Have during the pulse firing, if the signal on IC1 scanning flame pin A, the B is all unsuccessful, or maximum the maintenance for 14 seconds of pulse firing time, to light a fire after 14 seconds, pulse stops; Perhaps after lighting a fire successfully, if flame-out phenomenon appears in water heater; Or water heater burning the imperfect combustion state occurs after 1 minute, the then L0 of IC1, the sealing of L1 interface, and closed electromagnetic valve, water heater enter protection alarm condition (reporting to the police by light emitting diode L8 flicker); Under other situation, water heater all keeps normal working condition.

Above-mentioned flame pin A place is as long as there is flare up fire (flame ion electric current 〉=0.05UA) then BG2 conducting a little, has higher sensitivity during its induction flame, and when detecting to vibration of flame, have compatible (sampling has fiery state) preferably from flame, when taking off situation such as fire, and flame pin B place need enough flare up fire (the flame ion electric current must 〉=0.25UA), BG6 just can conducting, and it has sensitivity preferably (abnormal condition of sampling flame) to flame from flame, when taking off situation sampling such as fire.

The utility model is because the structure that has adopted crosspointer flame to detect; event is its reliability height to the protection of straight-line water heater imperfect combustion, highly sensitive not only; and one time ignition success rate is also higher; and technology is simple; debugging is convenient; with low cost, be the pulse firing controller that a kind of crosspointer flame convenient and practical, function admirable detects.

Claims

1, a kind of pulse firing controller of crosspointer flame detection, it is characterized in that including CPU (1), signal deteching circuit (2,3), drive circuit (4,5), wherein the input of signal deteching circuit (2,3) is connected with flame pin A, B in the water heater respectively, output all is connected with CPU (1), the input of drive circuit (4) is connected with CPU (1), and output is connected with igniting pin in the water heater; The input of drive circuit (5) is connected with CPU (1), and output is connected with gas electromagnetic valve.

2, the pulse firing controller that crosspointer flame according to claim 1 detects, it is characterized in that above-mentioned CPU (1) includes single-chip microcomputer IC1 and peripheral cell capacitor C 2 thereof, CX1, CX2, crystal oscillator X, signal deteching circuit (2) includes triode BG2 and peripheral cell resistance R 12 thereof, R16, R18, capacitor C 6, C8, signal deteching circuit (3) includes triode BG6 and peripheral cell resistance R 20 thereof, R21, R22, capacitor C 13, C14, drive circuit (4) includes triode BG3, BG4 and peripheral cell resistance R 13 thereof, R14, drive circuit (5) includes triode BG5, BG1, transformer T1, T2, high voltage package E1 and peripheral cell resistance R 1 thereof, R2, R3, diode D1, D2, D3, D8, capacitor C 1, C3, controllable silicon SCR, wherein the base stage of BG2 is connected with flame pin A by resistance R 18 and reaches and resistance R 16, one end of capacitor C 8 connects, the emitter stage of BG2 and resistance R 16, the connection of capacitor C 8 other ends reaches and BG3, BG4, BG5, the emitter stage of BG6 connects, and be connected with the interface L1 of IC1 by capacitor C 7, the colelctor electrode of BG2 passes through by resistance R 12, the parallel circuit ground connection that capacitor C 6 is formed; The base stage of triode BG6 is connected with flame pin B by resistance R 21 and is connected with an end of resistance R 20, capacitor C 13, the emitter stage of BG6 is connected with the other end of resistance R 20, capacitor C 13, and the colelctor electrode of BG6 is connected with the pin L4 of IC1 and the parallel circuit ground connection by being made up of resistance R 22, capacitor C 14; The base stage of triode BG3 is connected with the interface L1 of IC1 by resistance R 13, and the colelctor electrode of BG3 is connected with the coil LA that keeps of gas electromagnetic valve, and the two ends of LA are connected with diode D7; The base stage of triode BG4 is connected with the interface L0 of IC1 by resistance R 14, and the colelctor electrode of BG4 is connected with the coil LB that keeps of gas electromagnetic valve, and the two ends of LB are connected with diode D6, the equal ground connection of the other end of LA, LB; The base stage of BG5 is connected with the interface K0 of IC1 by resistance R 15, the colelctor electrode of BG5 is connected with the primary coil contact 6 of transformer T1, the base stage of BG1 is connected with an end of resistance R 1, the negative pole of D8 respectively, the other end of R1 is connected with the primary coil contact 7 of-T1, the positive pole of D8 is connected and ground connection with the igniting pin, the emitter stage of BG1 is connected and ground connection with the igniting pin, and the colelctor electrode of BG1 is connected with the primary coil contact 5 of T2, and the contact 6 of T1 is connected with the contact 4 of T2; One end of the primary coil of high voltage package E1 is connected with the secondary coil contact 3 of T2, the other end of the primary coil of E1 is connected with the secondary coil contact 1 of T1 by capacitor C 1, diode D2, the positive and negative electrode of controllable silicon SCR, resistance R 2 are connected between the contact 3 of the negative pole of diode D2 and T2, diode D2 is connected the two ends of the primary coil of E1, on the interface L2 of the trigger end of SCR by capacitor C 3, resistance R 3 and IC1.

3, the pulse firing controller of crosspointer flame detection according to claim 1 and 2, it is characterized in that above-mentioned CPU (1) also is connected with obstruction thermocouple testing circuit (6), the input that stops up thermocouple testing circuit (6) is connected with thermocouple, and output is connected with CPU (1).

4, the pulse firing controller of crosspointer flame detection according to claim 3, it is characterized in that above-mentioned obstruction thermocouple testing circuit (6) includes ic chip 2A, IC2B, resistance R 4～R10, capacitor C 4, C5, diode D4, D5, wherein the positive input terminal of IC2A is connected with the end of resistance R 5, R4, negative input end is connected with an end of resistance R 6, and output is connected with the interface K2 of IC1 and by capacitor C 4 ground connection; The positive input terminal of IC2B is connected with an end of resistance R 10, the other end of R10 is connected with an end of resistance R 8, the other end of R8 is connected with resistance R 5, the negative input end of IC2B is connected with an end and the thermocouple of resistance R 9 respectively, the other end ground connection of thermocouple, the end of R7, the minus earth of D5, the positive pole of D5 is connected with R10, R8, and the output of IC2B is connected with the pin 10 of IC1 by capacitor C 5 ground connection reaching.

5, the pulse firing controller of crosspointer flame detection according to claim 4 is characterized in that above-mentioned IC2A, IC2B are LM393.

6, the pulse firing controller that detects according to claim 1 or described crosspointer flame, it is characterized in that above-mentioned CPU (1) also is connected with water-control switch testing circuit (7), the input of water-control switch testing circuit (7) is connected with water-control switch SW1, and output is connected with CPU (1).

7, the pulse firing controller of crosspointer flame detection according to claim 6, it is characterized in that above-mentioned water-control switch testing circuit (7) includes resistance R 11, R17, capacitor C 10, C11, C12, wherein an end of capacitor C 10, C11, C12, resistance R 17 is connected with the interface G5 of IC1 and is connected with water-control switch SW1 by power supply B2, and be connected the equal ground connection of the other end of C10, C11, C12, R17 with the interface L3 of IC1 by resistance R 11.

8, the pulse firing controller that detects of crosspointer flame according to claim 7 is characterized in that being connected with light emitting diode L8 between the emitter stage of above-mentioned resistance R 11 and BG2, BG6.