JP2001004136A - Ignition controller for combustor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a satisfactory and secure ignition even in an initial ignition under non-stationary combustion environment such as unfavorable wind inflow and the like, and even in a reignition at the flame failure during continuous combustion. SOLUTION: When a combustor 2 is not ignited even by an ordinary ignition control means 6, and when a flame failure during continuous combustion is detected with a flame rod 7, a non-stationary judgement section 9 judges that a non-stationary combustion environment happens. After supply gas pressure and an air feed amount are increased and altered more than ordinary values by a supply degree alteration control section 10 after receiving the judgement, an igniter 5 is fired with an ignition control section 11. Ignition action is repeated several times. Post-purge time may be increased with a purge control section 12 every time. Additionally, the supply gas pressure and the feed air amount may be increased stepwise every time when the firing action is repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus having a combustor as a main component, such as a water heater, a hot water heater, a bathtub, or a combination thereof. Alternatively, the present invention relates to an ignition control device used for sure re-ignition when a misfire occurs during continuous combustion.

[0002]

2. Description of the Related Art In a combustion apparatus as described above, combustion air is introduced from the outside into a combustor housed in a casing for combustion, and exhaust gas after combustion is passed through an exhaust pipe or the like. It is derived outside. Therefore, depending on external weather conditions, wind may flow backward from the outside into the casing through the exhaust stack.

[0003] As a countermeasure against such reverse flow of wind, in a combustion apparatus such as a water heater, conventionally, in order to reliably discharge exhaust gas or the like by post-purging after stopping the combustion, the combustion apparatus is externally introduced into a casing. There is known a configuration in which the air volume of the post-purge is controlled to increase so as to counter the inflowing reverse wind pressure (for example, Japanese Patent No. 252112).
No. 2).

Further, for example, in an ignition stage based on a user operation, even if the combustor does not ignite in one ignition operation, the ignition operation is automatically performed a plurality of times under the same conditions (for example, two more times).
In general, when the ignition does not occur, the fuel supply or the like is stopped, and a safety operation such as displaying an error on a remote controller (hereinafter abbreviated as "remote controller") or the like is automatically performed. Is controlled.

Further, even in the combustion continuation stage, a situation may occur in which the flame of the combustor blows out (misfire) under the influence of the backflow of the wind. Is detected and the safety operation such as the fuel supply stop and the error display is automatically controlled.

[0006]

However, the ignition failure such as not firing even if the above-described ignition operation is performed and the misfire in the combustion continuation stage are caused by the fact that the combustion environment of the combustor in the casing is not in a steady state, but is caused by wind. It is considered that this is caused by falling into an unsteady state due to reverse inflow of water. In addition, with the rise of buildings in recent years such as high-rise apartments, the installation location of the combustion equipment becomes higher and it becomes more susceptible to weather conditions, especially strong winds and gusts, and the reverse inflow of wind as described above may occur Tend to increase further.

[0007] In addition to the above-described reverse flow of the wind, the ignition failure is caused by the low temperature of the first morning in the day or the low temperature of the winter in the year. It is considered that this is also caused by the fluctuation of the temperature condition that constitutes. Furthermore, even if the combustion air and fuel are supplied based on a predetermined air-fuel ratio, slight variations and the like may occur at each ignition operation timing of the igniter. It is also conceivable that ignition malfunctions occur in combination.

On the other hand, it is convenient for the user to detect the occurrence of the above-described combustion environment and perform a reliable ignition operation in response to the detection of the occurrence of the combustion environment as described above, in addition to simply performing the safety operation and the error display.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to mainly re-ignition in the event of misfiring during continuation of combustion as well as in initial ignition in a reverse wind inflow environment. Another object is to ensure that the ignition is good and reliable.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a method for igniting an unsteady combustion environment even when such an unsteady combustion environment occurs. Basically, one or both of the fuel supply degree and the air supply degree are increased and changed as compared with the normal ignition control.

More specifically, according to the present invention, as shown in FIG. 1, a combustor 2 for burning fuel and a fuel for supplying fuel to the combustor 2 are provided so that the degree of supply is changeable. A fuel supply system 3, an air supply system 4 for supplying combustion air to the combustor 2, and supplying the supply air in a changeable manner, and an igniter for performing an ignition operation on the combustor 2. 5 and a normal ignition control means 6 for causing the igniter 5 to perform an ignition operation in response to a combustion command signal based on a user's operation. . That is, a combustion state detecting means 7 for detecting whether the combustor 2 is in a combustion state or a non-combustion state, and a combustion state detection means 7 for detecting a non-combustion state caused by an unsteady combustion environment of the combustor 2. A malfunction ignition control means 8 for performing an ignition operation is provided. The malfunction ignition control means 8 determines whether the occurrence of the non-combustion state of the combustor 2 based on the state detection by the combustion state detection means 7 is caused by the occurrence of the unsteady combustion environment of the combustor 2. Unsteady determination unit 9 for determining whether
When the unsteady determination unit 9 determines that a non-combustion state occurs due to the unsteady combustion environment, the fuel supply system 3
And a supply degree change control unit 10 for increasing and / or increasing at least one of the fuel supply degree and the air supply degree by the air supply system 4 from a normal value. And an ignition control unit 11 for performing the following.

Here, the "combustor 2" and the "fuel supply system 3" include a petroleum burner having a fuel jet nozzle and a supply system for a liquid fuel such as gas oil or kerosene, or a gas combustion burner and a fuel burner. A supply system for gaseous fuel such as LPG or city gas can be used. When the fuel supply system is the above-described liquid fuel supply system, the supply degree can be changed by, for example, changing the discharge pressure or the discharge amount of an electromagnetic pump for supplying the liquid fuel, In the case of a supply system, for example, the opening degree of an electromagnetic proportional valve interposed in the supply pipe may be changed.

As the "air supply system 4", a system using a fan may be used. When a fan is used, a pushing system (a system illustrated in FIG. 1) for pushing air from the upstream end side into the combustor, A suction method for sucking air from the downstream end may be adopted. Further, in order to change the air supply degree, a change control of the rotation speed of each fan and a change control of the air flow path cross-sectional area may be performed. In order to change the cross-sectional area of the flow path, for example, the cross-sectional area of the flow path of the exhaust pipe on the air introduction side or the discharge side may be changed. For this change, various means such as a posture change control of a damper are used. I just need.

As the "combustion state detecting means 7", for example, a flame detector that receives a flame from the combustor 2 and converts it into an electric signal may be used.

The determination by the "unsteady determination unit 9" is such that in the initial ignition stage, the ignition operation based on the normal supply levels of fuel and air predetermined by the normal ignition control means 6 assuming that there is a steady combustion environment is performed. If the state detection by the combustion state detecting means 7 remains in the non-combustion state even after execution, it may be determined that the non-combustion state has occurred due to the occurrence of the unsteady combustion environment. Further, in the combustion continuation stage, when the state detection by the combustion state detecting means 7 changes from the combustion state to the non-combustion state, that is, when misfire occurs during the continuation of combustion, it is caused by the occurrence of the unsteady combustion environment. It may be determined that a non-combustion state has occurred. The ignition control by the malfunction ignition control means 8 based on the determination of the unsteady determination unit 9 includes only the initial ignition stage, only the combustion continuation stage,
Alternatively, both the initial ignition stage and the combustion continuation stage may be performed.

The increase change by the "supply degree change control unit 10" is to perform only one of the fuel supply degree, only the air supply degree, and both the fuel supply degree and the air supply degree. An increase change means an increase in pressure or volume. In the case of liquid fuel, the discharge pressure or the discharge amount of the fuel supply pump may be increased or changed. In the case of gaseous fuel, the discharge pressure or flow rate may be adjusted with respect to the supply source pressure from the supply source. When the air supply degree is changed, the air supply degree may be changed by increasing the rotation speed of the fan or by changing the cross-sectional area of the air flow path.

In the case where only the fuel supply degree is increased and changed, an unsteady combustion environment is generated in the initial ignition stage due to factors such as a lower temperature condition than in the steady state or a variation in the actual air-fuel ratio. Or
There is a case where a non-steady combustion environment is generated due to a reverse inflow of wind from the outside. In such a case, reliable ignition is achieved by changing the air-fuel ratio to a fuel richer than the normal value. In addition, as a case where only the air supply degree is increased and changed, there is a case where an unsteady combustion environment is generated due to a reverse inflow of wind from the outside at the initial ignition stage or reignition of misfire occurrence in the combustion continuation stage. In such a case, reliable ignition is achieved by changing the air supply degree so as to be able to counter the reverse wind pressure. Further, by increasing and changing both the supply levels of fuel and air, reliable ignition under the various unsteady combustion environments described above can be achieved.

The ignition operation by the "ignition control unit 11" is to cause the igniter 5 to perform the ignition operation under the execution of the increase change by the supply degree change control unit 10, but this ignition operation is not limited to one time. , Until the combustion state is detected by the combustion state detection means, that is, for example, twice until ignition occurs,
You may make it perform repeatedly three or four times. When repeating the ignition operation,
The increase change by the supply degree change control unit 10 may be increased stepwise. In that case, an upper limit value of the increase change may be set in advance, and when the upper limit value is reached, the ignition control may be stopped and the above-described safe operation may be performed.

Since the generation of the unsteady combustion environment is considered to be repeated several times with the passage of time, when the first unsteady combustion environment occurs, the amount of increase in the supply rate is increased stepwise as described above. When the ignition operation is repeated and the ignition operation is repeated, the increase change value at the stage of ignition is set as an initial value of the increase change value at the time of the next occurrence of the unsteady combustion environment, and this initial change value is set at the time of the second occurrence of the unsteady combustion environment. The first ignition operation may be started based on the value. It is possible to determine the degree of unsteadiness at the time of the first unsteady combustion environment, for example, the degree of reverse wind pressure, based on the magnitude of the increase change value at the stage of ignition,
By using the increase change value as an initial value at the time of the occurrence of the second unsteady combustion environment, it is possible to realize quick and more reliable ignition. That is, it is possible to evaluate the degree of unsteadiness (the degree of reverse wind pressure) using the increase change value as a parameter, and it is possible to more reliably perform the subsequent ignition control based on the evaluation. In this case, since the subsequent ignition control is performed based on the degree of the back wind pressure evaluated and determined, the second initial value is set only within the time lapse in which the same weather condition is considered to be continued. Setting is effective. Therefore, if the time interval from the occurrence of the previous unsteady combustion environment to the occurrence of the current unsteady combustion environment is too long, it is determined that the weather condition has already changed, and the initial value setting is performed. It is preferable to cancel and reset so as to perform the same increase change as the first ignition control.

Further, as described above, when the ignition operation is repeated by gradually increasing the change in the supply degree, the scavenging is performed each time the ignition operation is performed, and then the next ignition operation is performed. preferable. At this time, if the ignition does not occur even if the ignition operation is performed by increasing the increase change amount from the previous time, the scavenging performed before the next ignition operation is performed at a scavenging degree (scavenging pressure, scavenging amount or scavenging amount) higher than the previous scavenging. A scavenging control unit that increases the scavenging time may be added to the malfunction ignition control means. This makes it possible to reliably discharge unburned fuel even if the fuel supply degree is gradually increased and changed, and to ensure that the combustion environment during the next ignition operation is a predetermined one. It can be set.

In the case of the present invention described above, when an unsteady combustion environment occurs in which ignition does not occur even when the ignition operation is performed by the normal ignition control means in the initial ignition stage, or
When an unsteady combustion environment called misfire occurs in the combustion continuation stage, the unsteady determination unit of the malfunction ignition control unit determines that the above-described unsteady combustion environment has occurred. At least one of the supply degree and the air supply degree is increased and changed, and the ignition operation by the ignition control unit is performed in the increased and changed combustion environment. Accordingly, even if any of the above-mentioned unsteady combustion environments occurs, it becomes possible to reliably ignite the combustor under such an unsteady combustion environment.

[0022]

As described above, according to the ignition control apparatus for a combustion apparatus of the present invention, ignition can be reliably performed in the initial ignition stage even under an unsteady combustion environment. Even when a misfire occurs in the combustion continuation stage due to the occurrence of the unsteady combustion environment, the reignition can be performed reliably and automatically.

For this reason, in the case of the combustion equipment to which the present ignition control device is applied, the combustion equipment is installed in a place which is particularly susceptible to a gust, a strong wind, or a rapidly fluctuating outside temperature, such as a high-rise apartment, etc. Even if the combustion environment tends to occur, ignition at the initial ignition stage and re-ignition at the combustion continuation stage can be reliably ensured. In addition, such an ignition control device is particularly suitable for combustion equipment such as a hot water heater in which combustion is performed in a small capacity range among the combustion equipment, and ensures operation of such a hot water heater. Can be maintained.

[0024]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 2 shows an example of a combustion apparatus to which the embodiment of the present invention is applied. This combustion device is a bath cooker with a hot water heater with a water heater, and has the functions of hot water supply, heating, and bath reheating. In the figure, 21 is a heat exchange circuit for hot water supply, 22 is a heat exchange circuit for heating, 23 is a heat exchange circuit for reheating, and 24 is a controller for controlling the operation of these circuits. This combustion device raises the temperature of the hot water in the reheating heat exchange circuit 23 by performing heat exchange between the hot water in the heat exchange circuit 22 for heating and the hot water in the heat exchange circuit 23 for reheating during bath reheating. It is of the type that reheats it. The ignition control device according to the embodiment of the present invention is applied to the heat exchange circuit 21 for hot water supply and the heat exchange circuit 22 for heating. Hereinafter, each of the main components 21, 22, 23, and 24 of the combustion equipment will be described.

(Heat exchange circuit 21 for hot water supply) The heat exchange circuit 21 for hot water supply is arranged above a hot water supply casing (can body) 32 forming a hot water supply combustion chamber 31 and an upper portion of the combustion chamber 31 in the casing 32. A hot water supply heat exchanger 33, a hot water supply burner 34 disposed below the heat exchanger 33, and a hot water supply for supplying a fuel gas such as city gas or propane gas to the burner 34. Fuel supply system 35
And a hot-water supply air supply system 36 for supplying combustion air to the burner 34, and a hot-water supply inlet pipe 37 and a hot-water supply outlet pipe 38 connected to the hot-water supply heat exchanger 33, respectively.

The hot water supply fuel supply system 35 is provided with a hot water supply gas pipe 40 for connecting the downstream side of an opening / closing solenoid valve 39 common to a heating fuel supply system 55 described later and the hot water supply burner 34.
And the burner 34 inserted in the hot water supply gas pipe 40.
Electromagnetic valve for hot water supply 4 for changing and adjusting the gas pressure of fuel gas supplied by changing and adjusting the amount of fuel gas supplied to
1 is provided.

The hot-water supply air supply system 36 communicates with the lower end of the hot-water supply casing 32 and supplies a hot-air supply fan 42 such as a sirocco fan for blowing combustion air into the hot-water combustion chamber 31. A hot-water supply fan motor 43 for rotating the blower fan 42 is provided. By changing and controlling the rotation speed of the fan motor 43, the amount of air blown to the burner 34 can be changed and controlled.

Then, the water such as tap water supplied to the hot water supply heat exchanger 33 through the water inlet pipe 37 is heated by the flame of the hot water supply burner 34 while passing through the hot water supply heat exchanger 33. Hot water tap 4 of kitchen through hot water pipe 38
The hot water is supplied to a predetermined hot water supply point such as the heat-exchange circuit 4 or the heat exchange circuit 23 for reheating. Here, the hot water supply pipe 37 is provided with a water quantity sensor 45 as a hot water supply quantity detector for detecting the quantity of water entering the hot water supply heat exchanger 33, and a water supply temperature to the hot water supply heat exchanger 33. A hot water supply thermistor 46 is provided as a hot water supply hot water temperature detector, and a hot water supply heat exchanger 33
A tapping thermistor 47 is provided as a tapping water temperature detector for detecting tapping temperature.

In the casing 32, an igniter 4 as an igniter is provided near a position above a hot water supply burner 34.
8 and a rod frame 49 as a combustion state detecting means for detecting the flame from the burner 34, and a discharge cylinder for discharging combustion exhaust gas is communicated at the upper end.

(Heating Heat Exchange Circuit 22) The heating heat exchange circuit 22 is disposed above a heating casing (can body) 52 forming a heating combustion chamber 51 and above the combustion chamber 51 in the casing 52. A heating heat exchanger 53 provided, a heating burner 54 as a combustor disposed below the heat exchanger 53, and a heating fuel supply system for supplying the same fuel gas to the burner 54 as described above. 55, a heating air supply system 56 for supplying combustion air to the burner 54, and a heating circulation channel 57 partially connected to the heating heat exchanger 53. As the burner 54 in the heat exchange circuit 22 for heating, one having a smaller combustion capacity than the burner 34 for hot water supply is used.

As in the case of the hot water supply, the casing 52 has an igniter 58 as an igniter at a position near the heating burner 54 and a rod as combustion state detecting means for detecting the flame from the burner 54. A frame 59 is provided, and a discharge pipe for discharging combustion exhaust gas is communicated with the upper end.

The heating fuel supply system 55 is connected to the heating gas pipe 60 for connecting the downstream side of the common opening / closing solenoid valve 39 and the heating burner 54, and is interposed in the heating gas pipe 60. And a heating electromagnetic proportional valve 61 for changing and adjusting the gas pressure of the fuel gas supplied by changing and adjusting the fuel gas supply amount to the burner 54.

The heating air supply system 56 communicates with the lower end of the heating casing 52 and supplies a heating blower fan 62 such as a sirocco fan for blowing combustion air to the heating combustion chamber 51. A hot water supply fan motor 63 for rotating the blower fan 62 is provided. By changing and controlling the number of revolutions of the fan motor 63, the amount of air blown to the burner 54 can be changed and controlled.

The heating circulation channel 57 is provided with an expansion tank 64 interposed therebetween, a heating water inlet pipe 65 extending from the expansion tank 64 to the heating heat exchanger 53, and a heating heat exchanger 65. A hot water supply pipe 66 from 53 to the expansion tank 64 is provided. In the heating water inlet pipe 65,
A heating circulation pump 67 that circulates the hot water in the expansion tank 64 through the heating circulation flow path 57 and the like is provided.
The middle of the heating tapping pipe 66 is disposed so as to pass through a reheating heat exchanger 81 described later. The expansion tank 64 is connected to a downstream end of a heating water supply pipe 68 which is branched from a hot water supply water supply pipe 37 and has a water supply tap and a makeup water solenoid valve interposed therebetween, to perform water supply and water supply. It has become.

The upstream end of a low-temperature heating pipe 69 is connected to a heating water inlet pipe 65 at an intermediate position between the heating circulation pump 67 and the heating heat exchanger 53. The upstream end of the high-temperature heating pipe 70 is connected to the heating tapping pipe 66 at an intermediate position with the reheating heat exchanger 81. The downstream end of the heating return pipe 71 is connected to the heating tapping pipe 66 located at an intermediate position between the reheating heat exchanger 81 and the expansion tank 64.

The low-temperature heating pipe 69 is connected to the heating thermal valve 7.
2, the heater is connected to a heating device main body such as a panel heater or a fan heater (not shown), and return ends of the heating device main body are connected to the heating return pipe 71. On the other hand, the downstream end of the high-temperature heating pipe 70 is connected to a heating device main body such as an underfloor radiating pipe (not shown), and a return end from the heating device main body is connected to the heating return pipe 71.

A heating hot water outlet pipe 66 between the heating heat exchanger 53 and the branch from the high-temperature heating pipe 70 to the upstream end of the high-temperature heating pipe 70 detects the hot water temperature from the heat exchanger 53. A high-temperature heating thermistor 73 as a heater is installed, and a low-temperature heating thermistor 74 is provided in the heating return pipe 71.
Is installed.

An upstream end of a heating bypass pipe 75 is connected in the middle of the high-temperature heating pipe 70, and a downstream end of the heating bypass pipe 75 joins a heating return pipe 71 in front of the expansion tank 64. Connected to be. On the other hand, a bath heat operated valve 76 is interposed at a position downstream of the heating tapping heat exchanger 81 of the heating tapping pipe 66, and when the heat operated valve 76 is closed, the high temperature heating pipe 70 is connected to the heating pipe 70. The bypass pipe 75 for use constitutes a bypass flow path that bypasses the part of the heat exchanger 81 for reheating of the tapping pipe 66 for heating.

(Heat exchange circuit for reheating 23) The heat exchange circuit for reheating 23 comprises a reheating heat exchanger 81, a recirculation flow path 82 passing through the heat exchanger 81, and a recirculation flow path. A recirculation pump 83 for circulating hot water (not shown) through 82 and a pouring pipe 84 for pouring hot water into the circulation flow path 82 branching off from the hot water supply pipe 38.

The circulation channel 82 for reheating is provided with a bath return pipe 8 extending from a bathtub (not shown) to the heat exchanger 81 for reheating.
5 and a bath pipe 86 from the reheating heat exchanger 81 to the bathtub. The bath return pipe 85 is provided with the circulation pump 83, while the downstream end of the pouring pipe 84 is connected to the bath return pipe 85. The pouring pipe 84 is provided with a hot water level sensor 87, an electromagnetic on-off valve 88, and the like.

(Controller 24) Controller 24
Receive various operation commands based on a user's input operation from the remote controller 241 and receive the heat exchange circuits 21, 22, 23
, And includes a microcomputer, a memory, and the like. The controller 24 includes a hot water supply control unit, a bath reheating control unit, a heating control unit, and the like corresponding to the heat exchange circuits 21, 22, and 23. These hot water supply control means, bath reheating control means and heating control means are each provided with a normal ignition control means.

The hot water supply control means, on condition that the operation switch of the remote controller 241 is turned ON, when the hot water tap 44 is opened by the user and the water amount sensor 45 detects the water input amount equal to or more than the minimum operation water amount, The igniter 48 is ignited by the normal ignition control means in conjunction with the supply of the fuel gas from the fuel supply system 35 and the supply of the combustion air from the air supply system 36 to ignite the hot water supply burner 34. The igniter 48 stops when the flame rod 49 detects the flame, and thereafter the igniter 48 stops.
Predetermined combustion control is performed so as to reach the hot water supply temperature set by the user in Step 1.

The bath reheating control means includes the remote controller 2
The control is started when the user turns on the boiling temperature setting and the reheating operation switch for 41,
First, the electromagnetic opening / closing valve 88 is opened, and automatic pouring is performed to the set water level through the pouring pipe 84. When the set water level is reached, the attached normal ignition control means ignites the heating burner 54 in the same manner as described above, and the combustion is detected by the flame rod 59. Then, the heat valve 76 for bath is opened at the same time as the start of combustion, and the circulation pump 67 for heating and the circulation pump 83 for bath are driven. As a result, the hot and cold water in the expansion tank 64 circulates in the circulation circuit 57 for heating, while the hot and cold water in the bathtub circulates in the circulation flow path 82 for additional heating. Thereby, the hot and cold water supplied from the expansion tank 64 to the heating heat exchanger 53 via the heating water inlet pipe 65 is supplied to the heating heat exchanger 5.
While passing through 3, the heated hot water is heated by the flame of the heating combustion chamber 51, and the heated hot water flows out of the hot water discharge pipe 66 and returns to the expansion tank 64 through the additional heat exchanger 81. On the other hand, the hot water supplied from the bathtub to the reheating heat exchanger 81 through the bath return pipe 85 passes through the heating hot water pipe 66 while passing through the reheating heat exchanger 81, for example, about 80 degrees Celsius. After being heated by the
Return to bathtub via 6. As a result, the temperature of the hot water in the bathtub gradually increases.

The heating control means includes a high-temperature heating control section and a low-temperature heating control section. The user operates the remote control 241 to turn on the heating operation switch and to select either high-temperature heating or low-temperature heating. , Control is started.

When the high-temperature heating control is selected, the high-temperature heating control section ignites and burns the heating burner 54 by the normal ignition control means, and also omits an illustration (not shown) installed in the high-temperature heating pipe 70. The valve is opened to drive the heating circulation pump 67. As a result, the hot and cold water of the expansion tank 64 passes through the heating water inlet pipe 65 and is supplied to the heating heat exchanger 5.
3 while being heated by the flame in the combustion chamber 51,
The hot and cold water is heated by a hot water supply pipe 66 and a high-temperature heating pipe 7.
0, heating device main body such as underfloor radiating pipe and heating return pipe 7
1 and returns to the expansion tank 64. At this time, the hot-water valve 76 for the bath is closed, so that the hot water supplied to the hot-water outlet pipe 66 does not flow to the side of the reheating heat exchanger 81, and the high-temperature heating pipe It will flow to the side of 70. Then, for example, hot water of about 80 degrees Celsius radiates heat while passing through the heating device body such as the underfloor radiating pipe or the like, whereby underfloor heating or the like is performed.

When the low-temperature heating control is selected, the low-temperature heating control section ignites and burns in the same manner as in the above-described heating burner 54, and connects the bath thermal valve 76 and the heating thermal valve 72 to each other. The valve is opened to drive the circulation pump for heating 67. As a result, the heating water inlet pipe 65 from the expansion tank 64 is
Of the hot and cold water flowing into the heating pipe 69 for low temperature, and the remaining part is supplied to the heat exchanger 53 for heating. The hot and cold water supplied to the heating heat exchanger 53 is heated by the flame of the heating combustion chamber 51 while passing through the heat exchanger 53, and then is heated via the heating hot water pipe 66.
Return to 4. On the other hand, the hot and cold water flowing into the low-temperature heating pipe 69 passes through the heating heat valve 72, a heating device body such as a panel heater or a fan heater, and a heating return pipe 71, and the expansion tank 6.
Cycle back to 4. At this time, for example, 6 degrees Celsius
The hot water of about 0 degrees radiates heat while passing through the main body of the heating device such as the panel heater or the fan heater, thereby performing heating. Since the valve on the heating device main body side connected to the high-temperature heating pipe 70 is closed,
Hot water in the expansion tank 64 does not flow to the high-temperature heating pipe 70.

On the premise of the above configuration, the controller 24 is further provided with malfunction ignition control means as an embodiment of the present invention described below. The malfunction ignition control means is provided in combination with the normal ignition control means in each of the above hot water supply control means, bath reheating control means and heating control means. Since each malfunction ignition control means has the same configuration, only the malfunction ignition control means attached to the heating control means will be described with reference to FIG. 3 in the following embodiment, and other hot water supply control means or bath reheating control means will be described. The description of the components attached to is omitted.

<First Embodiment> The malfunction ignition control unit 92 includes an unsteady determination unit 921 and a supply degree change control unit 9.
22, an ignition control unit 923, and a scavenging control unit 924, and receives the ON operation signal of the heating operation switch from the remote control 241 and the detection signal from the frame rod 59 to supply the fuel gas from the fuel supply system 55. Solenoid valve 3 that opens and closes
9, electromagnetic proportional valve 61, fan motor 6 of air supply system 56
3 and each operation of the igniter 58 is controlled.

The unsteady determination unit 921 determines the occurrence of an unsteady combustion environment in the initial ignition stage and the combustion continuation stage, and the supply degree change control unit 922 prepares for the ignition in the unsteady combustion environment. The ignition control unit 923 controls the opening of the electromagnetic proportional valve 61 and the rotation speed of the fan motor 63. The ignition control unit 923 performs the ON operation (opening) of the electromagnetic valve 39 and the ignition operation of the igniter 58. In addition, the scavenging control unit 924 controls the number of rotations and the operation time of the fan motor 63.

Hereinafter, the control contents of the normal ignition control means 91 and the malfunction ignition control means 92 will be described in detail with reference to flowcharts shown in FIGS.

(Control at Initial Ignition Stage) FIGS. 4 and 5 show an initial ignition control SUB1.
The control 1 is started by the input of the ON operation signal of the heating operation switch from the remote controller 241. First, in step S1, the ignition operation number flag f is set to zero as an initial value, and then the normal ignition control means in steps S2 to S12. To control ignition.

In step S2, a normal initial gas pressure value Pint is set as the gas pressure P of the fuel gas, and the fan motor 6
A normal initial rotation value Fint is set as the rotation number F of 3. The relationship between Pint and Fint may be determined so as to have a predetermined air-fuel ratio (for example, an optimum air-fuel ratio). Then, the opening of the electromagnetic proportional valve 61 is set so that the opening corresponds to the gas pressure. In step S3, the pre-purge is performed by operating the fan motor 63 for a predetermined time. After that, in step S4, the igniter 58 is turned on, and in step S5
To add "1" to the ignition operation number flag f, and open the solenoid valve 39 in step S6. Then, in step S7, it is determined whether or not an ON signal (flame detection signal) has been output from the flame rod 59 (whether or not the combustion state has changed from a non-combustion state), that is, whether or not ignition has occurred. The operation is performed only for the lapse of the operation time (valve opening duration of the solenoid valve 39) Tgf (steps S8 and S7).

If the flame rod 59 outputs an ON signal even before the time Tgf elapses, the control proceeds to the normal combustion control SUB2. If ignition does not occur within the ignition operation time Tgf, the solenoid valve 39 is closed in step S9 to cut off the supply of fuel gas. And step S
At 10 and S11, the post-purge is performed by operating the fan motor 63 at a predetermined rotational speed F1 (for example, 116% of the normal maximum rotational speed) for the set scavenging time Tpf. This completes one ignition operation. Then, in the determination of the ignition operation number flag f in step S12, until the value f becomes “three times”, that is, in steps S2 to S4.
The ignition operation up to S11 is repeated three times. Steps S2 to S12 in which the ignition operation is repeated three times until ignition occurs constitute the control by the normal control means 91.

If ignition does not occur even after performing the ignition operation three times, it is determined that an unsteady combustion environment has occurred, and control is performed by the malfunction-time ignition control means 92 after step S13 shown in FIG.

That is, in step S13, a gas pressure value Pup increased and changed from the above Pint is set as the gas pressure P, and a rotation value Fup increased and changed from the above Fint is set as the rotation speed F of the fan motor 63. As Pup, for example, a value obtained by increasing Pint by several tens of percent may be used, and Fup may be determined so that a predetermined air-fuel ratio is obtained with respect to this Pup. For example, the initial value Pint of the normal gas secondary pressure is 50
６０60 mmH ₂ O, 10-2
Set a value of 0% increase. Then, the opening of the electromagnetic proportional valve 61 is changed so as to have an opening corresponding to the gas pressure P.

Thereafter, as in steps S3 to S11, the pre-purge is performed in step S14, the igniter 58 is turned on in step S15, "1" is added to the ignition operation number flag f in step S16, and the electromagnetic is performed in step S17. The valve 39 is opened. Then, step S1
In step 8, a determination as to whether or not ignition has occurred is made based on whether or not an ON signal has been output from the frame rod 59. The set ignition operation time Tgf
(Steps S19 and S18).

If the flame rod 59 outputs an ON signal even before the time of Tgf elapses, the control shifts to the normal combustion control SUB2. If the ignition is not performed within the ignition operation time Tgf, the solenoid valve 39 is closed in step S20 to shut off the supply of the fuel gas. And step S
At steps 21 and S22, the fan motor 63 is operated at the above-mentioned set rotation speed F1 for the set scavenging time Tpf to perform post-purge. Thus, the ignition operation under the unsteady combustion environment is completed once. In the determination of the ignition operation number flag f in step S23, the ignition operation in steps S13 to S22 is repeated until the value f becomes "6 times".
Repeat several times. Steps S13 to S23 in which the ignition operation is repeated three times until the ignition is performed in the unsteady combustion environment constitute the control by the malfunction ignition control means 92.

Even if the ignition is performed three times by the normal ignition control means 91 and three times in the unsteady combustion environment by the malfunction ignition control means 92, if the ignition still does not occur, A final post-purge is performed in step S24, and an error display is performed in step S25. This error display may be displayed in characters on the display of the remote controller 241, or a warning light may be turned on or a warning sound may be emitted.

In the above control, the ignition operation time Tgf may be changed and set according to the number of times of the ignition operation f. For example, as the Tg1 of the first ignition operation, 5 seconds,
Tg2 and Tg3 of the third ignition operation are 2 seconds each.
Each of Tg4 to Tg6 of the fourth to sixth ignition operations (that is, the first to third ignition operations by the ignition control means at the time of malfunction) includes three seconds. At this time, in the ignition operation by the malfunction ignition control means, the ignition operation time Tgf under the reverse flow condition of the wind is set, and the ignition operation by the normal ignition control means is performed so that the ignition can be performed even under the reverse flow condition of the wind. It may be longer or shorter than the time.

The scavenging time Tpf of the post-purge may be changed and set according to the number of times of ignition. As a criterion for this change setting, the gas pressure P may be changed to be longer by the increase so as to correspond to the increase. To illustrate,
The scavenging time Tp1 to Tp3 in the case of the normal ignition control means is 5 seconds, and the scavenging time T in the case of the malfunction ignition control means.
p4 to Tp6 each include a time longer than 5 seconds. In this case, the final scavenging time T of the post-purge by the normal ignition control means and the malfunction ignition control means, respectively.
p3 and Tp6 may each be longer.

Of the processing steps in the initial ignition stage described above, step S7 (if NO) when f = 3 constitutes the non-stationary determination section 921, and step S13 constitutes the supply degree change control section 922. Steps S15, S17, and S20 constitute an ignition control unit 923, and steps S21 and S24 constitute a scavenging control unit 924.

(Control in Combustion Continuation Stage) If the burner 54 is brought into a combustion state by the control in the initial ignition stage (YES in step S7 and step S18), the process proceeds to the normal combustion control SUB2. Normal combustion control SU
By B2, the control by the malfunction ignition control means in the combustion continuation stage is started.

This control is performed in step S3 as shown in FIG.
After the initialization of the re-ignition operation number flag f1 at 1 (zero setting) and the initialization of the misfire number flag U at step S32 (zero setting), respectively, the process proceeds to step S33.
It is determined whether misfire has occurred during the continuation of combustion.
This determination is made as to whether an OFF signal (a non-combustion state detection signal) is output from the frame rod 59, that is, whether the burner 5
The determination is made based on whether the flame No. 4 has been extinguished.

When a misfire occurs, first, in step S34
In step S35, "1" is added to the misfire count flag U, and in step S35, the fuel gas solenoid valve 39 is turned off (closed) to cut off the supply of the fuel gas.

Next, in step S36, it is confirmed that the number of re-ignition operation times flag f1 is 2 or less, and in step S37
Then, the above Pup is set as the gas pressure P1 for the reignition operation, that is, the opening of the electromagnetic proportional valve 61 is set, and the above Fup is set as the rotation speed F of the fan motor 63. At the same time, in step S38, the minimum output set value Psmax of the gas pressure after re-ignition is set as Pmin to Pmax (for example, 9
4 mmH ₂ O). Then, step S3
After the post-purge in step 9, the igniter 58 is turned on in step S40, and the number of re-ignition operations f in step S41.
In step S42, the solenoid valve 39 for fuel gas is turned on (opened) in step S42. That is, the first re-ignition operation is performed in a state where both the fuel gas pressure and the air flow are increased and changed.

It is determined in step S43 whether or not the ignition has been performed by the re-ignition operation, based on whether or not an ON signal has been output from the frame rod 59. If the ignition has not been performed, the solenoid valve 39 is determined in step S44 shown in FIG. Is turned off (closed) to shut off the fuel supply. Then, step S45
Is performed, and the re-ignition operation in steps S37 to S45 is repeated until the number of re-ignition operations f1 becomes three (in the case of YES in step S46). If the number of re-ignition operations f1 has become three (NO in step S46), post-purge is performed in step S47, an error is displayed in step S48, and the ignition control at the time of misfire occurrence is terminated in the combustion continuation stage.

When it is determined in step S43 whether or not the ignition has occurred, if the ignition is performed by the re-ignition operation (YES in step S43), the process proceeds to step S43.
Returning to step 33, it is confirmed whether or not a misfire has occurred. If the misfire does not occur immediately and the combustion state is maintained, the processing after step S49 is performed. The solenoid valve 3 is determined in steps S34 and S35.
9 is turned off, and if the number of re-ignition operations has reached three times (NO in step S36), step S54
, And an error display is performed in step S55, and the ignition control ends.

If the combustion state is continuing in step S33, the misfire history of the continuation of the combustion state is confirmed in step S49, and the continuation of the combustion state is continued from the initial ignition (U = 0), the process returns to step S32. On the other hand, if it is due to re-ignition after one misfire (U = 1), the process proceeds to step S50. Step S
At 50, the elapsed time from the first misfire is confirmed, and if it is before the elapse of the set time (for example, 15 minutes), the process returns to step S32 in the same manner as above, while if it is after the elapse of the set time, Determines that the unsteady combustion environment that caused the first misfire has improved and changed, and determines in step S51
To reset (reset) the re-ignition operation number flag f1. Further, in step S52, it is checked whether or not the set time has elapsed since the previous ignition operation, not from the first ignition operation, and if the set time has not elapsed since the previous ignition operation. While returning to step S32, if the set time has elapsed, it is determined that the unsteady combustion environment that caused the previous misfire has improved and changed in the same manner as described above, and the gas pressure after re-ignition is determined in step S53. The setting of the minimum output set value Psmax is restored from Pmax to Pmin.

Although not shown in the above flow chart, the heating switch of the remote controller 241 is turned on by a user operation before the elapse of a set time (for example, 15 minutes) from the previous reignition operation. After being turned off,
That is, if the above control is reset and then turned on again, it is determined that the cause of the unsteady combustion environment (for example, reverse inflow of wind) is still maintained, and the gas pressure after re-ignition is minimized. Set the output set value Psmax to Pmax instead of Pmin
The control of keeping the state is performed.
In addition, regarding the setting control of the minimum output set value Psmax, the same control as described above is performed not only when the combustion is stopped based on a user operation but also when the heating heat exchange circuit 22 is mechanically performed. It has become. That is, the heating heat exchange circuit 22 is provided with a thermostat that stops the ON-operation combustion when the temperature of the circulating hot water reaches a predetermined upper limit temperature value, and the thermostat is turned ON before the set time elapses. When the combustion is stopped and then turned off again to restart the combustion, the above Pma
Control for setting x as Psmax is performed.

The above-mentioned setting is made when the heating operation switch by the remote controller 241 is turned off and the combustion is stopped and then turned on again, or when the combustion is automatically stopped by the thermostat and restarted. Even if it occurs before the lapse of time, control is performed to initialize and reset the re-ignition operation number flag f1 in the same manner as in the process of step S50.

Among the processing steps of the malfunction ignition control means in the above combustion continuation stage, the step S33 for detecting that the OFF signal is output from the frame rod 59 in spite of the continuation of the combustion is the unsteady control. Step S37 constitutes the supply degree change control unit 922, and Steps S40 and S42 constitute the ignition control unit 923.
And the steps S45 and S47 are performed by the scavenging controller 92.
Constituting No. 3.

<Second Embodiment> FIGS. 8 to 10 show a part of the control contents of the malfunction ignition control means 92 according to the second embodiment. This second embodiment is the same as that of the first embodiment shown in FIGS. 3 to 7 except that the mode of increasing the change in the supply degree control unit 922 is different from that of the first embodiment. is there. Therefore, in the following description, only different points will be mainly described, and the same control contents will be denoted by the same step numbers as in the first embodiment, and detailed description thereof will be omitted.

(Control at Initial Ignition Stage) A flowchart shown by a combination of FIGS. 4 and 8 shows the initial ignition control SUB1 in the second embodiment. Then, as in the first embodiment, the control of the initial ignition control SUB1 is started by input of an ON operation signal of the heating operation switch from the remote controller 241. First, in step S1, the ignition operation number flag f is set to zero as an initial value. Then, the ignition control is performed by the normal ignition control means in steps S2 to S12 (see FIG. 4).

Next, the malfunction ignition control means 9 shown in FIG.
2 is performed. In this case, the difference from the first embodiment (see FIG. 5) is that when the ignition operation is repeated until the number of ignitions reaches six in step S23, the ignition operation by the ignition control means 92 for the fourth time is performed. In the case where re-ignition does not occur even in the first ignition operation, instead of repeating the increase operation of the supply degree under the same conditions as the previous operation as in the first embodiment, the next ignition operation is performed using the previous increase change value. The point is that it is further increased and changed. That is, after step S23, in step S260, a value obtained by adding the gas pressure increment value ΔP to the previous P is set as the gas pressure P, and a value obtained by adding the rotation speed increment value ΔF to the previous F is set as the rotation speed F. After that, the process returns to step S14 to repeat the re-ignition operation. In the second embodiment,
Steps S13 and S260 correspond to the supply degree change control unit 92.
2 will be constituted. The other control units 921, 9
The relationship between 23 and 924 and each processing step is the same as in the first embodiment.

(Control in Combustion Continuation Stage) If the burner 54 is brought into a combustion state by the control in the initial ignition stage (YES in step S7 and step S18), the process proceeds to the normal combustion control SUB2, and FIG. The normal ignition control SUB2 shown in FIG. 9 and FIG. 10 starts the control by the malfunction ignition control means in the combustion continuation stage.

This control differs from that of the first embodiment (see FIG. 6 and FIG. 7) in that the next re-ignition operation is performed by increasing the fuel gas and air flow as in the above-described control of the initial ignition stage. Is performed by further increasing the previous increase change value, and the increase change value at the time of ignition in the previous ignition control under the unsteady combustion environment is used as the initial value when the next unsteady combustion environment occurs. The point is to use.

Specifically, step S3 of the first embodiment
7 (see FIG. 6) instead of step S in the second embodiment.
370 (see FIG. 9) and step S491.
(See FIG. 9) and step S451 (see FIG. 10) are added.

That is, in step S370, the value of the gas pressure P at the time of ignition under the unsteady combustion environment at the initial ignition stage is used as the gas pressure P1 at the time of the first reignition operation (FIG. 8).
Of step S260 and YE in step S18
The value of the gas pressure P obtained by S) is set.

Next, in step S451, the gas pressure increment value ΔP is set to the previous P1 as the gas pressure P1 at the time of the second or subsequent reignition operation, and similarly, as the rotation speed F1 at the time of the second or later reignition operation. The rotation speed increment value ΔF is set to the previous F1.

On the other hand, the fuel is ignited by the above-described ignition operation (in the case of YES in step S43), the combustion state is maintained (in the case of NO in step S33), and the combustion state is maintained after the first misfire. (Step S
In the case of YES in 49), in step S491, the ignition is performed by the current ignition operation as the initial values P, F of the increase change values of the fuel gas and the blowing amount to be used when the next misfire occurs (P, F in step S370). The gas pressure P1 and the rotation speed F1 at this time are respectively set.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to a claim as an example of the present invention.

FIG. 2 is an overall schematic diagram of a combustion apparatus to which an embodiment of the present invention is applied.

FIG. 3 is a block diagram of a malfunction ignition control unit and the like.

FIG. 4 is a first half of a flowchart showing control contents in an initial ignition stage of the first embodiment.

FIG. 5 is a second half of the flowchart following FIG. 4;

FIG. 6 is a first half of a flowchart showing the control contents of a combustion continuation stage of the first embodiment.

FIG. 7 is a latter half of the flowchart following FIG. 6;

FIG. 8 is a diagram corresponding to FIG. 5 of the second embodiment.

FIG. 9 is a first half of a flowchart showing control contents in a combustion continuation stage of the second embodiment.

FIG. 10 is a second half of the flowchart following FIG. 9;

[Explanation of symbols]

 Reference Signs List 2 combustor 3 fuel supply system 4 air supply system 5 igniter 6,91 normal ignition control means 7 combustion state detection means 8,92 ignition control means when malfunctioning 9,921 unsteady determination unit 10,922 supply degree change control unit 11 , 923 Ignition control unit 12, 924 Scavenging control unit 34, 54 Burner (combustor) 35, 55 Fuel supply system 36, 56 Air supply system 48, 58 Igniter (igniter) 49, 59 Flame rod (combustion state detecting means)

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Eiichi Tsuji 93 Edo-cho, Chuo-ku, Kobe, Hyogo Pref. (72) Inventor Yoshihiko Kanayama 93 Edo-cho, Chuo-ku, Kobe-shi, Hyogo Prefecture Inside Noritz Co., Ltd. Akira Morimoto 93 Edocho, Chuo-ku, Kobe City, Hyogo Prefecture Within Noritz Co., Ltd. (72) Inventor Hideya Tokuyama 93 Edocho, Chuo-ku, Kobe City, Hyogo Prefecture Noritsu Co., Ltd.

Claims (6)

[Claims] 1. A combustor for burning fuel, a fuel supply system for supplying fuel to the combustor, the supply degree being changeable, and supplying combustion air to the combustor. An air supply system for supplying a changeable supply degree, an igniter for performing an ignition operation on the combustor, and performing an ignition operation on the igniter in response to a combustion command signal based on a user operation. A combustion state detection means for detecting whether the combustor is in a combustion state or a non-combustion state, and an unsteady combustion of the combustor. Malfunction ignition control means for igniting the combustor when a non-combustion state due to the environment occurs, wherein the malfunction ignition control means determines whether or not the combustor is inactive based on the state detection by the combustion state detection means. Burning An unsteady determination unit that determines whether the state is caused by the occurrence of the unsteady combustion environment of the combustor; and the unsteady determination unit determines that the unburned state is caused by the unsteady combustion environment. A supply degree change control unit for increasing and / or increasing at least one of the fuel supply degree by the fuel supply system and the air supply degree by the air supply system from a normal value; and And an ignition control unit for performing an ignition operation by a heater. 2. The non-steady state determination unit according to claim 1, wherein the state detection by the combustion state detection unit remains in the non-combustion state even when the ignition operation by the normal ignition control unit is performed in the initial ignition stage. An ignition control device for a combustion device, configured to determine that a non-combustion state has occurred due to the occurrence of an unsteady combustion environment. 3. The non-steady state determination unit according to claim 1, wherein when the state detection by the combustion state detection means changes from the combustion state to the non-combustion state in the combustion continuation stage, the non-steady state determination unit determines the non-steady state caused by the occurrence of the unsteady combustion environment. An ignition control device for a combustion device, configured to determine that a combustion state has occurred. 4. The ignition control unit according to claim 1, wherein the ignition control section is configured to repeatedly perform the ignition operation within a predetermined set number of times until the combustion state is detected by the combustion state detection means. Ignition control device for combustion equipment. 5. The ignition control unit according to claim 4, wherein the malfunction ignition control unit includes a scavenging control unit that performs scavenging after the ignition operation by controlling a supply operation by the air supply system. When the detection state by the combustion state detection means remains in the non-combustion state even when the ignition operation is repeatedly performed by the control unit, the scavenging degree is compared with the previous scavenging by further increasing and changing the air supply degree by the air supply system. An ignition control device for a combustion device, wherein the ignition control device is configured to increase the amount of change. 6. The supply level change control unit according to claim 4, wherein the supply level change control unit increases the supply level increase and change stepwise each time the ignition operation by the ignition control unit is repeated, and the state detection by the combustion state detection means is performed by the non-combustion state. An ignition control device for a combustion device, wherein an increase change value at a stage when the state changes from the state to the combustion state is set as an initial value of the increase change value in the next ignition operation control.