JPH07103470A - Combustion instrument - Google Patents

Abstract

PURPOSE:To provide a combustion instrument, capable of excluding an erroneous stop of burning operation due to incomplete combustion condition caused by the affection of wind or the like and operating properly in the case of incomplete combustion due to the blockading and the like of an exhaust gas passage or an air supplying passage. CONSTITUTION:A combustion instrument is provided with a first incomplete combustion monitoring means 27, monitoring whether the detection of incomplete combustion detected by an incomplete combustion detecting means 26 has been continued for a predetermined timer time or not, a second incomplete combustion monitoring means 27, monitoring the repeated number of detection when the detection of the incomplete combustion has been effected within the timer time or less, and a combustion control means 22, controlling burning operation based on the monitoring results of the monitoring means 26, 27. The combustion control means 22 stops the burning operation of the combustion instrument so that the restarting of the operation is impossible when the incomplete combustion has been continued for a time set the timer while the control means 22 stops the burning-operation of the combustion instrument so as to be capable of restarting when the repeating number of incomplete combustion within a time set by the timer has arrived at a predetermined number of repeating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a combustion device such as a water heater,
In particular, the present invention relates to a combustion device equipped with a means for detecting incomplete combustion in a combustion section by an unburned gas sensor such as a CO sensor.

[0002]

2. Description of the Related Art Conventionally, in this type of apparatus, for example, an unburned gas sensor for detecting unburned gas such as CO is provided in an exhaust passage connected to a combustion chamber of a water heater, and the amount of unburned gas is measured. It is known that the incomplete combustion state is detected by the output of the corresponding unburned gas sensor and the combustion operation is stopped by this, and in this type, when the output of the unburned gas sensor exceeds a predetermined judgment level. Judge that an incomplete combustion state has occurred.

By the way, the incomplete combustion state in which the output of the unburned gas sensor exceeds a predetermined judgment level is caused by the blockage of the exhaust passage or the air supply passage, the clogging of the fins, etc., and the combustion chamber of the water heater. There is an incomplete combustion state due to strong wind being blown into the combustion chamber and obstructing the air supply to the combustion chamber.The former incomplete combustion state may cause the exhaust passage and the air supply passage to be blocked, fins to be clogged, etc. Unless excluded
Although it does not disappear, the latter incomplete combustion state is generally temporary and resolves spontaneously. Then, when the former incomplete combustion state occurs, it is desirable to stop the combustion operation, and when the latter incomplete combustion state occurs, it is desirable to be able to continue the combustion operation.

However, in the conventional case, the output of the unburned gas sensor is not distinguished from the continuous incomplete combustion state due to the blockage of the exhaust passage and the air supply passage and the temporary incomplete combustion state due to the wind. Since the combustion operation is stopped when exceeds the predetermined determination level, there is a disadvantage that the combustion operation is originally stopped when it is not necessary to stop the combustion operation.

In order to eliminate such an inconvenience, the combustion operation is stopped when an incomplete combustion state in which the output of the unburned gas sensor exceeds a predetermined judgment level is continuously detected for a predetermined time, and When the detection of the incomplete combustion state does not reach the predetermined time, it is possible to continue the combustion operation. Further, when a continuous incomplete combustion state is detected, it is conceivable to disable the combustion device and prompt the user for a repair request.

On the other hand, for example, when the degree of blockage of the exhaust passage or the like is small, or when the amount of gas supply to the gas burner changes even if the degree of the exhaust passage or the like is relatively large, unburned The output of the gas sensor often goes up and down with respect to a predetermined judgment level. Then, even in such a case, it is desirable to stop the combustion operation, and the state in which the output of the unburned gas sensor frequently goes up and down with respect to the predetermined determination level as described above is also caused by the influence of wind or the like. Since it can happen, it is desirable to stop the combustion operation so that it can be restarted.

However, when the combustion operation is stopped only when the incomplete combustion state is continuously detected for a predetermined time as described above, the output of the unburned gas sensor is set to a predetermined determination level due to the exhaust passage being partially clogged. On the other hand, when it goes up and down frequently, there is a disadvantage that the combustion operation continues, and it is desired to eliminate this.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and eliminates erroneous stop of the combustion operation due to an incomplete combustion state due to the influence of wind, etc. An object of the present invention is to provide a combustion device that operates properly in an incomplete combustion state due to blockage or the like.

[0009]

In order to achieve such an object, the present invention provides a combustion apparatus equipped with an incomplete combustion detecting means for detecting incomplete combustion in a combustion section, which is not provided by the incomplete combustion detecting means. The first incomplete combustion monitoring means for monitoring whether or not the complete combustion detection continues for a predetermined timer time, and the detection of the incomplete combustion by the incomplete combustion detection means ends within the time period less than the timer time. At this time, a second incomplete combustion monitoring means for monitoring the number of repetitions of the detection, and when the detection of the incomplete combustion continues for the timer time, the combustion operation of the combustion equipment is stopped unrestartable, and When the number of repetitions of the detection of the incomplete combustion within a time period shorter than the timer time reaches a predetermined number, the operation control means for resumably stopping the combustion operation of the combustion device is provided. It is characterized in.

Further, when the detection of the incomplete combustion is continued for the time period of the timer and the operation is stopped so that the engine cannot be restarted,
It is characterized in that it is provided with a storage means for storing and holding information indicating that and a display means for displaying the information stored and held in the storage holding means.

[0011]

According to the present invention, when the detection of incomplete combustion by the incomplete combustion detection means continues for the timer time, the combustion control is stopped by the operation control means so that the exhaust passage is blocked. In such cases, combustion operation is prohibited.

Further, the detection of the incomplete combustion by the incomplete combustion detecting means ends within a time period shorter than the timer time,
When this is repeated, when the number of repetitions reaches a predetermined number, the operation control means stops the combustion operation. As a result, the combustion operation is stopped when an incomplete combustion state is repeated for a short time, such as when the exhaust passage is partially clogged, and when a single incomplete combustion state due to wind or the like occurs. , Combustion operation continues.
Further, even if the temporary incomplete combustion state due to wind or the like frequently occurs, the combustion operation is stopped, but at the time of this stop, restarting is possible, so that the restarting restarts the combustion operation without trouble. It becomes possible.

Further, in the case where the system is stopped so that it cannot be restarted,
Information indicating that a continuous incomplete combustion state has occurred due to blockage of the exhaust passage is stored and held in the storage means and is displayed by the display means, so that the user is notified that such an inconvenient state has occurred. Etc. can be clearly recognized, and it becomes possible for a user to make a repair request and to make a proper repair by a dealer.

[0014]

An embodiment of the present invention will be described below with reference to the drawings. 1 is an explanatory cross-sectional view of a water heater provided with this embodiment,
FIG. 2 is a block configuration diagram of a main part of FIG. 1, and FIG. 3 is a flow chart diagram for explaining the operation of the present embodiment.

As shown in FIG. 1, a forced combustion type gas water heater A includes a gas burner 2 for performing combustion in a combustion housing 1.
(Combustion section) is arranged, and the blower fan 3 supplies the combustion air X for the gas burner 2 to the combustion housing 1. Also,
In the water heater A, the combustion control device 4 supplies gas to the gas burner 2, ignites the gas burner 2, and controls the combustion fan 3.

The combustion housing 1 is provided below with combustion air X.
And an exhaust port 6 for discharging the combustion exhaust gas Z to the outside. Also, the combustion housing 1
A heat exchanger 7 is arranged above the gas burner 2 therein.

The gas burner 2 is composed of a burner group 8 for forming a flame and a nozzle tube 10 located below the burner group 8 and having an ejection port 9. Further, the fuel gas Y is supplied to the gas burner 2 through the gas pipe 11. The blower fan 3 includes turbo type blades.

The combustion control device 4 includes a water amount regulator 12, a water amount sensor 13, a thermistor 14, a source gas solenoid valve 15, a main solenoid valve 16, a governor type gas proportional solenoid valve 17, an igniter 18, a frame rod 19, and a CO sensor. 20 and a controller 21 for controlling them. Controller 2
As shown in FIG. 2, the reference numeral 1 denotes a combustion control means 22 (operation control means) and a CO sensor control means 23 as its functional configuration.
And a incomplete combustion determination means 24. CO sensor 20 and incomplete combustion determination means 24
And the incomplete combustion detection means 26. The incomplete combustion determination means 24 includes a first incomplete combustion monitoring means 27 and a second incomplete combustion monitoring means 28. Further, the controller 21 is provided with an EEPROM (storage unit) 29 that stores and holds information regarding incomplete combustion, and is further connected with a display unit (display unit) 30 that displays the information in the EEPROM 29. In addition, the controller 21
A reset switch 31 that can be operated only by a trader is connected to the combustion control means 22 of FIG.

Next, the controller 21 of the combustion control device 4
The basic operation of will be described with reference to FIG.

When a hot water supply tap (not shown) is opened while the operation switch (not shown) is turned on, the controller 21 detects this by the water amount sensor 13 and the combustion control means 22 controls the blower fan 3. The gas is burned and the igniter 18 is operated, and the original gas solenoid valve 15, the main solenoid valve 16 and the proportional solenoid valve 17 are controlled to open to supply the fuel gas to the gas burner 2 and thereby ignite the gas burner 2. Then, the combustion operation of the water heater is started. At this time, when the gas burner 2 is ignited, the ignition is detected by the frame rod 19, and when the ignition due to the operation of the igniter 18 is not detected, the igniter 18 and the original gas solenoid valve 15 are turned off to operate the water heater. To stop.
When ignition is detected, the igniter 18 is turned off, the gas amount proportional control is performed by the proportional solenoid valve 17, and the CO sensor control means 23 energizes the CO sensor 20 to activate it. The incomplete combustion detection operation described later is performed by the sensor 20, the incomplete combustion determination means 24, and the like. The gas amount proportional control and the incomplete combustion detection operation are continuously performed until the hot water tap is closed. CO
The operation of the sensor 20 may start at the time when the ON signal is output from the water amount sensor 13, or at the time when a predetermined time has elapsed after detecting the flame.

When the hot water tap is closed, the controller 21 detects this with the water amount sensor 13, and the combustion control means 22 causes the source gas solenoid valve 15, the main solenoid valve 16,
The proportional solenoid valve 17 is controlled to be closed to extinguish the gas burner 2, the combustion fan 3 is further stopped, and the CO sensor 20 is turned off, whereby the combustion operation of the water heater is stopped.

At the start of the combustion operation, the EEPROM is
Data stored and held in 29 are read out and displayed, which will be described later.

Next, the incomplete combustion detection operation will be described in detail with reference to FIG.

The basic operation of this incomplete combustion detection operation will be described. The controller 21 determines that the CO concentration (CO value) detected by the output of the CO sensor 20 corresponds to the incomplete combustion state of the gas burner 2. The combustion operation is stopped when the state of being equal to or greater than the predetermined determination value continues for a predetermined timer time (detection timer time) set at the start of the combustion operation.

More specifically, when the combustion operation is started and the CO
When the sensor 20 is activated, the CO sensor 20 causes C
The O value is detected. At this time, the incomplete combustion determination means 24 of the controller 21 determines that the detected CO value is a predetermined determination value (for example, 2000 ppm CO concentration) due to incomplete combustion.
In the above case, the detection timer 24a (see FIG. 2) built in the incomplete combustion determination means 24 is started.

When the CO value becomes equal to or more than the predetermined judgment value as described above, the incomplete combustion judgment means 24 changes the state to the timer time of the detection timer 24a, that is, the time after the detection timer 24a starts. The first incomplete combustion monitoring means 27 monitors whether or not it continues for a time until it goes up. When the state in which the CO value becomes equal to or greater than the predetermined judgment value continues for the timer time of the detection timer 24a, the incomplete combustion judgment means 24 operates the combustion control means 22 to cause the original gas solenoid valve 15, the main solenoid valve 16, and the proportional solenoid valve. The gas burner 2 is extinguished by controlling to close 17 and the combustion fan 3 is stopped to be driven, whereby the combustion operation of the water heater is stopped. Further, the incomplete combustion determination means 24 stores abnormal information such as CO value when the combustion operation is stopped and stores it in the EEPROM 29, and then the sensor control means 23 turns off the CO sensor 20.
To do.

In this embodiment, when the combustion operation is stopped in this way, the combustion operation of the water heater is basically
It is considered impossible to restart. That is, referring to FIG. 3, for example, when the user turns on the operation switch (not shown) again to open the hot water tap (not shown) to restart the combustion operation, the command of the combustion control means 22 causes EEPROM2
The abnormal data is read from 9, and the abnormal data or error is displayed on the display 30. In this case, although the combustion operation is restarted by turning on the reset switch 31, the reset switch 31 is provided at a place where the user cannot operate (for example, inside the water heater main body or the controller 21). Therefore, the user cannot restart the combustion operation.

As a result, in the case where the introduction port 5 or the exhaust port 6 is blocked such that the incomplete combustion state (CO value ≧ determination value) continues, the combustion operation of the water heater is stopped. At the same time, the combustion operation thereafter is prohibited in principle, and the situation in which the combustion operation is performed in such a state is avoided. Further, when the user tries to restart the water heater, the abnormal data and the error content are displayed on the display 30 without restarting the combustion operation, so that the introduction port 5 and the exhaust port 6 are blocked. It is possible to recognize that there is a problem, and repair is necessary, and it is possible to accurately request a repair from a contractor. Further, the contractor who has received the repair request can recognize the cause of the failure by the display on the display unit 30 and perform an accurate repair, and after the repair,
The combustion operation can be restarted without any trouble by simply operating the reset switch 31. The abnormal data in the EEPROM 29 is erased by the trader after repair.

On the other hand, referring to FIG. 4, in the incomplete combustion detection operation, within the detection timer time (detection timer 2
4a before the time expires), the CO value becomes smaller than the judgment value, that is, the CO value once becomes equal to or larger than the judgment value, but within the detection timer time, the CO value becomes smaller than the judgment value again. In this case, the incomplete combustion determination means 24 stops the detection timer 24a until the CO value becomes equal to or higher than the determination value. And in such cases,
The incomplete combustion determination means 24 determines the number of occurrences of the incomplete combustion state in which the CO value fluctuates with respect to the determination value within the detection timer time as described above, by the second incomplete combustion monitoring means 28.
To count using the count parameter K.

The count parameter K is set to "0" at the start of combustion operation, and is set to "0" every time an incomplete combustion state occurs in which the CO value rises and falls below the judgment value within the detection timer time. The number of repetitions of occurrence of such an incomplete combustion state is counted. Then, when the value of the count parameter K reaches a predetermined value, in other words, in the case where an incomplete combustion state in which the CO value fluctuates with respect to the determination value within the detection timer time occurs relatively frequently, The incomplete combustion determination means 24 operates the combustion control means 22 to turn off the original gas solenoid valve 15 and the like.
F to stop the combustion operation. And in this case, C
The combustion operation is stopped without storing and holding abnormal data such as the O value in the EEPROM 29. In this case, an error display different from the error content described above may be displayed.

As a result, when the introduction port 5 or the exhaust port 6 is partially clogged, or the introduction port 5 or the exhaust port 6 is clogged, in which an incomplete combustion state occurs intermittently for a relatively short period of time. When the combustion amount of the gas burner 2 frequently changes due to the proportional control of the gas amount in a state of progressing to a certain degree, the situation in which the combustion operation is stopped and the incombustible gas is accumulated is avoided. A situation in which the incomplete combustion state is intermittently generated for a relatively short period of time and the combustion operation is stopped may occur due to the influence of wind or the like, but when the combustion operation is stopped, the EEPROM 29 is stopped.
Since the abnormal data is not stored and retained in, the user can restart the combustion operation without any trouble. When the incomplete combustion state occurs sporadically due to a temporary wind or the like, the combustion operation continues without stopping.

The present invention is not limited to the above embodiments, but can be modified as appropriate without departing from the gist of the present invention. For example, in the present embodiment, the hot water supply device has been described as an example of the combustion device, but it goes without saying that the present invention can be applied to a combustion device such as a fan heater.

[0033]

As is apparent from the above description, according to the present invention, when the detection of the incomplete combustion by the incomplete combustion detecting means continues for the predetermined timer time, the combustion operation of the combustion equipment cannot be restarted. When the detection of incomplete combustion by the incomplete combustion detection means is repeatedly performed within the time period shorter than the timer time,
When the number of repetitions of the detection reaches a predetermined number, the combustion operation of the combustion equipment is restartably stopped, so that a temporary incomplete combustion state due to the influence of wind etc. may occur sporadically. In this case, it is possible to eliminate a malfunction that would stop the combustion operation in such cases, and if continuous incomplete combustion occurs due to blockage of the exhaust passage,
It is possible to reliably stop the combustion operation, and it is possible to avoid a situation in which the combustion operation is restarted in such a state. In addition, even if the exhaust passage is partially clogged and the incomplete combustion state is repeated intermittently for a short time, the combustion operation is stopped. It is possible to avoid a situation where the operation is performed, and when such a state occurs due to the influence of wind or the like, the combustion operation can be restarted without trouble by restarting the combustion equipment. Therefore,
It is possible to provide a combustion device that performs an appropriate operation according to various situations in which incomplete combustion occurs.

Further, when continuous incomplete combustion occurs due to blockage of the exhaust passage or the like, information indicating that effect is stored in the storage means and is displayed on the display means. Can take appropriate measures such as a repair request, and the contractor who has received the repair request can promptly take appropriate repair measures.

[Brief description of drawings]

FIG. 1 is an explanatory sectional view of a water heater to which an embodiment of the present invention is applied.

FIG. 2 is a block configuration diagram of a main part of FIG.

FIG. 3 is a flowchart for explaining the operation of the water heater of FIG.

FIG. 4 is a flowchart for explaining the operation of the water heater of FIG.

[Explanation of symbols]

22 ... Combustion control means (operation control means), 26 ... Incomplete combustion detection means, 27 ... First incomplete combustion monitoring means, 28 ...
Second incomplete combustion monitoring means, 29 ... EEPROM (storage means), 30 ... Indicator (display means).

Claims (2)

[Claims] 1. A combustion apparatus equipped with incomplete combustion detection means for detecting incomplete combustion in a combustion section, monitoring whether or not the detection of incomplete combustion by the incomplete combustion detection means has continued for a predetermined timer time. When the detection of the incomplete combustion by the first incomplete combustion monitoring means and the incomplete combustion detection means is completed within the time less than the timer time, the second incomplete combustion monitoring means monitors the number of repetitions of the detection. When the monitoring means and the detection of the incomplete combustion continue for the timer time, the combustion operation of the combustion device is stopped unrestartable, and the number of repetitions of the detection of the incomplete combustion within the time less than the timer time. When a predetermined number of times has been reached, an operation control means for resumably stopping the combustion operation of the combustion equipment is provided. 2. When the detection of the incomplete combustion is stopped for a restart due to the duration of the timer, storage means for storing and holding information indicating that, and information stored and held in the storage holding means. The combustion device according to claim 1, further comprising: a display unit that displays.