CN1114789C

CN1114789C - Combustion controlling circuit

Info

Publication number: CN1114789C
Application number: CN97120464A
Authority: CN
Inventors: 安藤厚史; 栗木圭一
Original assignee: Rinnai Corp
Current assignee: Rinnai Corp
Priority date: 1996-10-16
Filing date: 1997-10-15
Publication date: 2003-07-16
Anticipated expiration: 2017-10-15
Also published as: TW471612U; CN1179528A; KR19980032812A; KR100254099B1

Abstract

To decrease a maximum load current in a combustion control circuit using as a power source a power source circuit for converting an alternating current from a battery or a commercial power source into a direct current. A combustion control circuit comprises a valve opening circuit 23 for forcedly opening a safety valve 14 under an electromagnetic force, a holding circuit 24 for opening and holding the safety valve 14, an ignition circuit 25 and a flame rod circuit 26. During an ignition operation, the valve opening circuit 23 is operated for a short time, and the holding circuit 24 and the ignition circuit 25 are operated for a prescribed ignition time. Then, after the operation of the valve opening circuit 23 is completed, the flame rod circuit 26 is operated.

Description

Combustion controlling circuit

Technical field

The present invention relates to be applicable to the combustion controlling circuit of burners such as water heater, in more detail, just relate to battery or the alternating current of source power supply and convert the combustion controlling circuit that galvanic power circuit is a power supply to.

Background technology

In burner, emit the countermeasure of coal gas when preventing to catch fire, on the pipeline of the fuel supplying of burner, electromagnetic valve is set, this electromagnetic valve utilizes the operating physical force of electromagnetic force or button and opens, by utilizing electromagnetic force to be held open state.When making this burner operation, when ignition operation, open electromagnetic valve, then, with thermoelectric occasionally flame rod detection burner catch fire during, electromagnetic valve remained opening and remain in operation.In addition,, just close electromagnetic valve, prevent to emit coal gas when thermoelectricity when occasionally flame rod detects burner and catches fire.

Here, as the mode of opening electromagnetic valve, operating physical force mechanical system of opening and the electric means that makes big electric current utilize electromagnetic force to open by the electromagnet that is arranged on the electromagnetic valve of utilizing button are arranged.

The case of fire of opening the valve circuit, electromagnetic valve is remained the holding circuit of opening and detecting burner of when adopting electric means, firing circuit that burner is lighted is set in combustion controlling circuit, opening electromagnetic valve makes the testing circuit that catches fire of holding circuit work simultaneously when burner catches fire.And, when carrying out ignition operation, make firing circuit work certain hour, thereby when the beginning ignition operation, make out the valve circuit working short time open electromagnetic valve simultaneously.And, in firing circuit carries out the certain hour of work, thereby also make holding circuit work that electromagnetic valve is remained opening after the valve circuit quits work opening.After the end-of-job of firing circuit, if the burner point has caught fire, just the signal according to the testing circuit that catches fire makes electromagnetic valve remain opening by holding circuit, thereby proceeds burning.On the other hand, if burner does not have point to catch fire, the testing circuit that then catches fire just makes holding circuit quit work, thereby closes electromagnetic valve, prevents to emit coal gas.

Here, in the testing circuit that catches fire, use thermocouple sometimes, need certain preheating time but thermocouple produces the required electromotive force of detected temperatures from starting working to.Therefore, when in the testing circuit that catches fire, using thermocouple, after the end-of-job of firing circuit, also must electromagnetic valve be remained opening, until preheating time through thermocouple by holding circuit.Therefore, in the process of firing circuit work, when burner does not catch fire, because electromagnetic valve remains opening before the preheating time that arrives thermocouple, so, will discharge coal gas.

In contrast, if constitute the testing circuit that catches fire by the flame-rod circuit that catches fire that uses flame rod to detect burner, also can detected temperatures even unlike thermocouple, carry out preheating.Therefore, after the end-of-job of firing circuit, flame-rod circuit just detected the igniting situation of burner immediately and makes holding circuit work, thereby can make electromagnetic valve remain opening when burner had caught fire in the process of firing circuit work.Like this, when having used flame-rod circuit, when carrying out ignition operation, can make the working time of firing circuit and holding circuit consistent.Therefore, in the end-of-job of firing circuit, the work of the holding circuit during ignition operation just stops.So when flame-rod circuit did not detect catching fire of burner, flame-rod circuit was just forbidden holding circuit work, electromagnetic valve is just closed immediately.Like this, just, can prevent reliably owing to the igniting mistake causes gas leak.

The power-supply battery of using as combustion controlling circuit and the general manganese dry cell that uses, as shown in Figure 5, its utilization rate changes with the variation of load current.Here.So-called utilization rate is exactly an employed value when judging life-span of battery usually, the utilization rate height, and the life-span of battery is long, and utilization rate is low, and the life-span of battery is short.Hence one can see that, and the big more utilization rate of electric current load current required when using battery is low more, thereby the life-span of battery is also short more.In addition, utilization rate also has deviation with each battery.In Fig. 5, a line represents it is the characteristic of the battery that utilization rate is the highest in a plurality of batteries; The b line represents it is the characteristic of the minimum battery of utilization rate.As shown in Figure 5, when load current hour, the difference of the utilization rate of a and b is certain basically, and when load current surpassed 500mA, its reduced rate was just very big from the beginning for the low battery of utilization rate, thereby the difference of the utilization rate of a and b increases.The deviation that is the life-span of battery also increases.

As mentioned above, in combustion controlling circuit, be provided with utilize electromagnetic force open electromagnetic valve open valve circuit and flame-rod circuit the time, just need be used to make the load current of these circuit workings, in order to make firing circuit work, combine with needed load current, when ignition operation begins, just flow through bigger load current.Therefore, when the summation of these load currents for example surpasses 500mA, if the low battery of utilization rate, thus sometimes before the date is changed in the appointment of battery battery just consume clean end-of-life in advance, thereby the number of times of battery altering increases, and makes troubles to the user.

Also have,, also use sometimes the alternating current of source power supply is converted to galvanic power circuit as the power supply of combustion controlling circuit.At this moment, when being used to make the load current of above-mentioned each circuit bigger, large load current when adapting to ignition operation constitutes parts such as the transformer of power circuit or silicon electric bridge and must select the higher large component of rated value for use, thereby the maximization and the cost that will cause machine improves.

Summary of the invention

In view of above situation, research topic of the present invention just is to reduce the initial load current of ignition operation, makes above-mentioned defective be unlikely generation.

In order to address the above problem, combustion controlling circuit of the present invention is to convert the combustion controlling circuit of galvanic power circuit as power supply to battery or the alternating current of source power supply, it is characterized in that: have the firing circuit to the burner igniting; Be arranged on to burner and send on the pipeline of fuel the Electromgnetic seat valve that utilizes electromagnetic force to control the conducting of above-mentioned pipeline and close; That opens this electromagnetic valve opens the valve circuit; Electromagnetic valve is remained the holding circuit of opening and detect the igniting situation of burner and when said burner is caught fire, make the flame-rod circuit of above-mentioned holding circuit work with flame rod.By ignition operation, make out valve circuit working the 1st setting-up time, make above-mentioned firing circuit and above-mentioned holding circuit work 2nd setting-up time longer simultaneously than above-mentioned the 1st setting-up time, when opening the end-of-job of valve circuit, flame-rod circuit is started working above-mentioned.

According to the present invention, when carrying out ignition operation, not that all required circuit are worked simultaneously when making igniting, but flame-rod circuit is started working, so, the load current in the time of can reducing to carry out ignition operation.Therefore, when using battery as the power supply of combustion controlling circuit, the deviation that can suppress utilization rate that the individual difference by battery causes and be the life-span increases.Like this, even be exactly the low battery of utilization rate from the beginning, its reduced rate can not increase terrifically yet, so, can prevent the phenomenon that battery is made troubles to the user with regard to consuming only before the date is changed in the appointment of battery.

In addition, use when the alternating current of source power supply converted to galvanic power circuit as the power supply of combustion controlling circuit, because the load current when carrying out ignition operation is little, so, can make parts such as the transformer that constitutes power circuit or silicon electric bridge adopt the little small parts of rated value, thereby can realize the miniaturization of machine and reduce cost.

Description of drawings

Fig. 1 is the front view of an example of using the water heater of circuit of the present invention.

Fig. 2 is the constructed profile of the gas valve assembly that is provided with in water heater.

Fig. 3 is the block diagram of one embodiment of the invention.

Fig. 4 is the sequential chart of the working time of each circuit of expression.

Fig. 5 is the load current of expression battery and the graph of relation between the utilization rate.

Fig. 6 is the block diagram of another embodiment behind the change power supply.

The specific embodiment

Embodiment:

Below, illustrate that a exemplary application with combustion controlling circuit of the present invention is in the embodiment of the represented water heater 1 of Fig. 1.

Water heater 1 has gas burner 2 and the heat exchanger 3 of this gas burner 2 as thermal source.The gas valve assembly 7 that water pipe on also having the lower end that is arranged on water heater 1 in addition and being connected on the running water pipe (not shown) is connected with coal gas Pipe joint 6 on being connected on the gas pipe (not shown) with joint 4 water valve assembly 5 that is connected and the lower end that is arranged on water heater 1.

Heat exchange water route 8 by heat exchanger 3 and obstructed over-heat-exchanger 3 be close to the dirty side that water route, road 9 is connected water valve assembly 5.The dirty end in this heat exchange water route 8 is connected with the mixing portion 10 that dirty end that is close to water route, road 9 and the lower center portion that is arranged on water heater 1 are divided.In addition, going out sprinkler head 11 is connected with this mixing portion 10 by bend pipe 12.

Water valve assembly 5 makes from not shown running water pipe to water heater 1 water flowing or pass water by the push that the user carries out button 13.In addition, the adjustment of being undertaken to the water-flowing amount in above-mentioned two water routes 8,9 by user's rotary manipulation button 13.Because this structure and the not special difference of existing well-known structure, so, its detailed description omitted.

As shown in Figure 2, in gas valve assembly 17, one side begins to be provided with in proper order electromagnetic valve 14, hydraulic pressure responding valve 15, gas control 16 and coal gas adjustable valve 17 from the upper reaches.Hydraulic pressure responding valve 15 utilizes the control lever 15a of the water controller (not shown) interlock that is provided with in water valve assembly 5 to push when water flowing and drives valve.In addition, the manipulation chuck 18a that the switch 18 that is used in electromagnetic valve 14 switchings carries out on/off is set on control lever 15a.As shown in Figure 1, coal gas adjustable valve 17 by with the operation control lever 17a meshed gears 17b of the front that is arranged on water heater 1,17b regulates the coal gas amount linkedly with the operation control lever.

Because gas valve assembly 7 has above-described structure, so, the user presses the button 13 when giving water heater 1 water flowing, by not shown water controller control lever 15a is pushed to the left in Fig. 2 and open hydraulic pressure responding valve 15, simultaneously, chuck 18a on the control lever 15a moves with the left side of control lever 15a in Fig. 2, thereby switch 18 is connected.Like this, just the described electromagnetic valve 14 in back is opened, supplied with coal gas to burner 2, its igniting.

As shown in Figure 1, the flame that is provided with the flame rod 20 of the case of fire that detects burner 2 to ignition plug 19 of burner 2 igniting, when carrying out ignition operation and detects the state that catches fire of igniting EO afterburner 2 in water heater 1 detects the thermocouple 21 of usefulness.In addition, in the side of heat exchanger 3, the thermocouple 22 of the imperfect combustion situation that detects the burner 2 that anoxic causes is set above burner 2.

Fig. 3 represents the combustion controlling circuit of present embodiment, and the power supply of this circuit is a battery 31.The 2nd coil 14b that be provided with in electromagnetic valve 14 that resistance is little, the 1st coil 14a that produces big electromagnetic force and resistance are big, produces little electromagnetic force.And, thereby thereby setting utilizes big electromagnetic force to open opening valve circuit 23 and utilizing little electromagnetic force to be held open the holding circuit 24 of state for the 2nd coil electricity of electromagnetic valve 14 for the 1st coil 14a energising in combustion controlling circuit.

Make ignition plug 19 produce spark discharge detects burner 2 with the firing circuit 25 of the igniting of burner 2, according to the electric current that flows through flame rod 20 the flame-rod circuit 26 of case of fire and catching fire and unburnt catching fire and anoxic testing circuit 27 of detection burner 2 thereby also be provided with in the combustion controlling circuit.And the electromotive force of above-mentioned 2

thermocouples

21,22 of connecting of polarity is imported this and is caught fire and anoxic testing circuit 27.

At burner 2 be in catch fire state time output high level signal when flame-rod circuit 26 flows through electric current in flame rod 20 here.In addition, when in the flame rod 20 during not by electric current burner 2 be in output low level signal when catching fire state.

Catch fire and anoxic testing circuit 27 surpasses catching fire during discriminant value of appointment at the electromotive force of the thermocouple of being imported 21 and is in output high level signal when catching fire state at burner 2.In addition, thus catch fire and anoxic testing circuit 27 drops to catching fire and output low level signal during the anoxic discriminant value less than appointment at the catch fire electromotive force of thermocouple 21 of burner 2.In addition, thus when burner 2 imperfect combustions take place was in anaerobic condition, the flare of burner 2 will raise.Thereby heat hot galvanic couple 22 like this, just produces electromotive force in thermocouple 22.Thereby the electromotive force of this electromotive force and thermocouple 21 is cancelled out each other input is caught fire and the electromotive force of anoxic testing circuit 27 reduces.Like this, catch fire and anoxic discriminant value when following, catch fire and anoxic detects 27 with regard to the output low level signal when the input electromotive force drops to.

In addition, in the combustion controlling circuit of present embodiment, also be provided with the 1st to the 3rd 3 timing circuits 28 that pick up counting from the moment that above-mentioned switch 18 is connected ₁, 28 ₂, 28 ₃The 1st timing circuit 28 ₁, 18 connections from the outset constantly begin, at the 1st setting-up time T ₁The signal of output high level in (for example 0.4 second) is by the 1st timing circuit 28 ₁The output signal of high level make out 23 work of valve circuit, to the 1st coil 14a energising, thereby electromagnetic valve 14 is opened.

The 2nd timing circuit 28 ₂From the moment that switch 18 is connected, the signal of output high level in than long the 2nd setting-up time T2 (for example 0.8 second) of the 1st setting-up time T1 is by the 2nd timing circuit 28 ₂The output signal of high level make firing circuit 25 work, make holding circuit 24 work simultaneously, to the 2nd coil 14b energising, thereby electromagnetic valve 14 is remained opening.

The 3rd timing circuit 28 ₃From the moment that switch 18 is connected, at the 3rd setting-up time T suitable with the heating stand-by period of thermocouple 21 ₃The signal (not shown) of output high level in (for example 30 seconds).In addition, also with the 3rd timing circuit 28 ₃Output signal input AND gate circuit 29.In addition, the signal of output is imported AND gate circuits 29 by "NOT" circuit 30 when opening 23 work of valve circuit.Therefore, when opening valve circuit 23 and quit work, just from the signal of "NOT" circuit 30 output high level, so, be carved into through the 3rd setting-up time T when opening the end-of-job of valve circuit 23 ₃During in from the signal of AND gate circuit 29 output high level, and make flame-rod circuit 26 work by this output signal.

Except the 2nd timing circuit 28 ₂Output signal input holding circuit 24 outside, flame-rod circuit 26 and catch fire and the output signal of anoxic testing circuit 27 is also imported holding circuit 24.Like this, when from the signal of this each

circuit

26,27 output high level, holding circuit 24 is also worked, thereby switches on to the 2nd coil 14b.

According to said structure by ignition operation, when promptly the push by button 13 carries out water flowing switch 18 is connected, as shown in Figure 4, from the moment that switch 18 is connected, at the 1st setting-up time T ₁In open valve circuit 23 work.In addition, in the 2nd setting-up time T2, holding circuit 24 and firing circuit 25 are worked simultaneously.Like this, electromagnetic valve 14 is just opened by electromagnetic force, becomes opening, thereby coal gas supplied burner 2 is lighted a fire burner 2 by ignition plug 19.

And, through the 1st setting-up time T ₁After, when opening the end-of-job of valve circuit 23, send the signal of high level to AND gate circuit 29 from "NOT" circuit 30.In addition, simultaneously at the 3rd setting-up time T ₃In, from the 3rd timing circuit 28 ₃Signal to AND gate circuit 29 input high levels.Therefore, by the signal of AND gate circuit 29 to flame-rod circuit 26 input high levels, thereby flame-rod circuit 26 is started working.

Like this, through the 1st setting-up time T ₁The time, open the end-of-job of valve circuit 23, but holding circuit 24 works in the 2nd setting-up time T2, so electromagnetic valve 14 still is in opening.In addition, in the 2nd setting-up time T2, make ignition plug 19 work, the operation of lighting a fire by firing circuit 25.

Through the 2nd setting-up time T2 the time, the 2nd timing circuit 28 ₂Signal to holding circuit 24 input, but this moment if burner 2 has caught fire, then after through the 2nd setting-up time T2, also send signals to holding circuit 24 from flame-rod circuit 26, holding circuit 24 works on, thereby the burning of burner 2 is proceeded.Also have, though not shown,, begin to through the 3rd setting-up time T from the moment that switch 18 is connected ₃During in, produce required electromotive force from thermocouple 21, therefore, before flame-rod circuit 26 power cut-offs, catch fire and anoxic testing circuit 27 is started working.And after through the 3rd setting-up time T3, by catching fire and the signal of anoxic testing circuit 27 makes holding circuit 24 work, electromagnetic valve 14 remains on opening, thereby the burning of burner 2 is proceeded.

Here, the load current of opening valve circuit 23 is about 410mA, and the load current of holding circuit 24 is about 6mA, and the load current of firing circuit 25 is about 80mA, and the load current of flame-rod circuit 26 is about 20mA.Therefore, if these

circuit

23,24,25 of the moment of connecting at

switch

18,26 all work, and then maximum load current is exactly 516mA, still, and in the present embodiment, owing to flame-rod circuit 26 is started working, so maximum load current is 496mA.Like this, in the present embodiment, can reduce maximum load current required when carrying out ignition operation.Specifically, make maximum load current exactly, so can suppress the tendency that the deviation of the utilization rate that caused by battery individual difference shown in Figure 5 increases less than 500mA.Therefore, battery can not take place consumed clean before the replacing date of appointment and increase battery altering number of times etc., the inconvenience that brings to the user.

In addition, in the above-described embodiments, be to use battery as the power supply of combustion controlling circuit, still, with the alternating current of source power supply 32 is converted to galvanic power circuit 33 as the combustion controlling circuit of power supply also can with above-mentioned the same formation.In the present embodiment, the same except being that battery 31 utilizes the alternating current with source power supply 32 to be transformed to galvanic power circuit 33 formations with the power supply among Fig. 3 with the foregoing description of Fig. 3, so, omit its detailed description.According to present embodiment, as mentioned above,,, thereby can realize the miniaturization of machine and reduce cost so as the transformer 34 that constitutes power circuit 33, or parts such as silicon electric bridge 35 can adopt the little small parts of rated value because maximum load current reduces.

The embodiment of the combustion controlling circuit that applies the present invention to water heater more than has been described, still, equally also can have used the present invention for the combustion controlling circuit of other burners such as burner for cooking and heating installation.

Claims

1. one kind with the combustion controlling circuit of battery as power supply, it is characterized in that comprising: to the firing circuit of burner igniting; The electromagnetic force of utilizing that is arranged on the fuel feed pipe road of burner is carried out the conducting in this fuel feed pipe road and the electromagnetic valve of closing; That opens this electromagnetic valve opens the valve circuit; Electromagnetic valve remained the holding circuit of opening and use flame rod to detect the case of fire of burner and when burner catches fire, make the flame-rod circuit of above-mentioned holding circuit work;

By ignition operation the above-mentioned valve circuit of opening is worked in the 1st setting-up time, above-mentioned firing circuit and above-mentioned holding circuit are worked in than the 2nd long setting-up time of the 1st setting-up time, when opening the end-of-job of valve circuit, flame-rod circuit is started working above-mentioned.

2. one kind to convert the alternating current of source power supply to the combustion controlling circuit of galvanic power circuit as power supply, it is characterized in that comprising:

Firing circuit with the burner igniting; The electromagnetic force of utilizing that is arranged on the burner fuel service is carried out the conducting in this fuel feed pipe road and the electromagnetic valve of shutoff operation; That opens this safety valve opens the valve circuit; Electromagnetic valve remained the holding circuit of opening and use flame rod to detect the case of fire of burner and when burner catches fire, make the flame-rod circuit of holding circuit work;

By ignition operation the above-mentioned valve circuit of opening is worked in the 1st setting-up time, above-mentioned firing circuit and above-mentioned holding circuit are worked in the 2nd setting-up time longer than the 1st setting-up time, flame-rod circuit is started working when opening the end-of-job of valve circuit above-mentioned.