JP2619206B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to combustion equipment such as a water heater,
In particular, the present invention relates to a combustion device provided with 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, 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, for example. It is known that an incomplete combustion state is detected based on 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 determination level, It is determined that an incomplete combustion state has occurred.

An incomplete combustion state in which the output of the unburned gas sensor exceeds a predetermined determination level includes an incomplete combustion state caused by blockage of an exhaust passage and an air supply passage, clogging of fins, and the like, and a combustion chamber of a water heater. There is an incomplete combustion state in which strong air is blown into the combustion chamber and the air supply to the combustion chamber is obstructed, and the former incomplete combustion state causes clogging of exhaust passages and air supply passages, clogging of fins, etc. Unless excluded
Although not resolved, the latter incomplete combustion condition is generally temporary and resolves spontaneously. It is desirable that the combustion operation be stopped when the former incomplete combustion state occurs, and that the combustion operation be continued when the latter incomplete combustion state occurs.

However, in the prior art, the output of the unburned gas sensor is not distinguished between a continuous incomplete combustion state caused by blockage of the exhaust passage and the air supply passage and a temporary incomplete combustion state caused by wind and the like. Is designed to stop the combustion operation when it exceeds a predetermined determination level. Therefore, 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 inconvenience, the combustion operation is stopped when an incomplete combustion state in which the output of the unburned gas sensor exceeds a predetermined determination level is continuously detected for a predetermined time. If the detection of the incomplete combustion state is shorter than the predetermined time, the combustion operation may be continued. Further, when a continuous incomplete combustion state is detected, it is conceivable to disable the restart of the combustion equipment and urge the user to request a repair.

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 supplied to the gas burner changes even if the degree of blockage of the exhaust passage or the like is relatively large, unburned fuel In many cases, the output of the gas sensor frequently rises and falls with respect to a predetermined determination level. Also in such a case, it is desirable to stop the combustion operation, and such a state in which the output of the unburned gas sensor frequently fluctuates with respect to a predetermined determination level may be caused by the influence of wind or the like. Because it is possible, it is desirable to stop the combustion operation so that restarting is possible.

However, if 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 becomes a predetermined judgment level due to a half-clogging of the exhaust passage or the like. In the case where the temperature rises and falls frequently, there is a disadvantage that the combustion operation is continued, and it is desired to solve this.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and it is possible to eliminate the 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 the above object, the present invention relates to a combustion apparatus provided with incomplete combustion detecting means for detecting incomplete combustion in a combustion section. First incomplete combustion monitoring means for monitoring whether the detection of complete combustion has continued for a predetermined timer time, and detection of incomplete combustion by the incomplete combustion detection means has been completed within a time less than the timer 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 device is stopped so that it cannot be restarted, and When the number of repetitions of detection of the incomplete combustion within a time period less than a timer time reaches a predetermined number, operation control means for stopping the combustion operation of the combustion device so as to be restartable. It is characterized in.

Further, when the detection of the incomplete combustion has been continued for the timer period and the engine has stopped unrestartable,
It is characterized by comprising a storage means for storing and holding information indicating that, and a display means for displaying the information stored and held in the storage and 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 it cannot be restarted, whereby the exhaust passage is blocked. In such a case, the combustion operation is prohibited.

[0012] Further, detection of incomplete combustion by the incomplete combustion detection means is completed within a time less than the timer time,
When this operation is repeated and the number of repetitions reaches a predetermined number, the combustion operation is stopped by the operation control means. Thereby, the combustion operation is stopped when the incomplete combustion state occurs repeatedly for a short time as in the case of a half-clogging of the exhaust passage, and when a single incomplete combustion state due to wind or the like occurs. The combustion operation is continued.
Further, even when a temporary incomplete combustion state frequently occurs due to wind or the like, the combustion operation is stopped. However, when the combustion operation is stopped, the combustion operation can be restarted. It becomes possible.

[0013] Further, when the system is stopped so that it cannot be restarted,
Information indicating that a continuous incomplete combustion state has occurred due to a blockage of the exhaust passage or the like is stored in the storage means and displayed on the display means, so that the user is notified that such an inconvenient state has occurred. Can be clearly recognized, and a repair request by a user and a repair by a trader can be accurately performed.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory sectional view of a water heater provided with the present embodiment,
FIG. 2 is a block diagram of a main part of FIG. 1, and FIG. 3 is a flowchart for explaining the operation of the present embodiment.

As shown in FIG. 1, a forced combustion gas water heater A includes a gas burner 2 that burns in a combustion housing 1.
(Combustion section), and the blower fan 3 supplies the combustion air X of 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 with combustion air X downward.
, And a discharge port 6 for discharging the combustion exhaust gas Z to the outside is provided above. Also, the combustion housing 1
A heat exchanger 7 is arranged above the gas burner 2 in the inside.

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

The combustion control device 4 includes a water regulator 12, a water sensor 13, a thermistor 14, an original gas solenoid valve 15, a main solenoid valve 16, a governor 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, a combustion control means 22 (operation control means), a CO sensor control means 23
And a microcomputer including incomplete combustion determination means 24. CO sensor 20 and incomplete combustion determination means 24
Constitute 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 means) 29 for storing information on incomplete combustion, and further connected to a display (display means) 30 for displaying information of the EEPROM 29. The controller 21
Is connected to a reset switch 31 that can be operated only by a trader or the like.

Next, the controller 21 of the combustion control device 4
Will be described with reference to FIG.

When the hot water tap (not shown) is opened with the operation switch (not shown) turned on, the controller 21 detects this by the water amount sensor 13 and controls the blower fan 3 by the combustion control means 22. The fuel gas is supplied to the gas burner 2 by driving the igniter 18 and operating the igniter 18 and opening the original gas solenoid valve 15, the main solenoid valve 16, and the proportional solenoid valve 17 to 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 if the ignition by 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 the ignition is detected, the igniter 18 is turned off, then the proportional control of the gas amount is performed by the proportional solenoid valve 17, and the CO sensor 20 is energized by the CO sensor control means 23 to start it. An incomplete combustion detection operation to be described later is performed by the sensor 20 and 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. In addition, CO
The operation of the sensor 20 may be started 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 by the water amount sensor 13 and the combustion control means 22 causes the original gas solenoid valve 15, the main solenoid valve 16,
By controlling the proportional solenoid valve 17 to close, the gas burner 2 is extinguished, the driving of the combustion fan 3 is stopped, and the CO sensor 20 is turned off, thereby stopping the combustion operation of the water heater.

At the start of the combustion operation, the EEPROM
The reading and display of the stored data 29 are performed, which will be described later.

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

The basic operation of the 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 more than the predetermined determination value has continued 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 outputs C
An 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, a CO concentration of 2000 ppm) due to incomplete combustion.
Then, the detection timer 24a (see FIG. 2) built in the incomplete combustion determination means 24 is started.

When the incomplete combustion determination means 24 determines that the CO value is equal to or greater than the predetermined determination value as described above, the state is determined by the timer time of the detection timer 24a, that is, the time from the start of the detection timer 24a. The first incomplete combustion monitoring means 27 monitors whether or not the time up to the time of continuation is continued. When the state in which the CO value becomes equal to or greater than the predetermined determination value continues for the timer time of the detection timer 24a, the incomplete combustion determination means 24 operates the combustion control means 22, and the original gas solenoid valve 15, the main solenoid valve 16, and the proportional solenoid valve. 17 is closed so that the gas burner 2 is extinguished and the combustion fan 3 is stopped, thereby stopping the combustion operation of the water heater. Further, the incomplete combustion determination means 24 stores, for example, information such as the CO value at the time of stopping the combustion operation as abnormal data in the EEPROM 29, and then turns off the CO sensor 20 by the sensor control means 23.
I do.

In this embodiment, when the combustion operation is stopped as described above, the combustion operation of the water heater is basically performed as follows.
Restarting is not possible. 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) in order to restart the combustion operation, the combustion control means 22 issues a command. EEPROM2
The abnormal data is read out from 9 and the abnormal data or the 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 location 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.

In this way, when the inlet 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 subsequent combustion operation is prohibited in principle, and a situation in which the combustion operation is performed in such a state is avoided. Further, when the user attempts to restart the water heater, the abnormal data and the details of the error are displayed on the display 30 without restarting the combustion operation, so that the inlet port 5 and the exhaust port 6 are blocked. Then, it is possible to recognize that the repair is necessary, and it is possible to appropriately request the repair to the trader. Further, the contractor who has received the repair request can recognize the cause of the failure and perform an accurate repair based on the display on the display 30, and after the repair,
Only by operating the reset switch 31, the combustion operation can be restarted without any trouble. Incidentally, the abnormal data in the EEPROM 29 is deleted by the trader after the repair.

On the other hand, referring to FIG. 4, in the incomplete combustion detection operation, the time within the detection timer (detection timer 2
Before the time-up of 4a), when the CO value becomes smaller than the judgment value, that is, although the CO value once becomes the judgment value or more, the CO value becomes smaller than the judgment value again within the detection timer time. In this case, the incomplete combustion determination means 24 stops the detection timer 24a until the CO value becomes equal to or more than the determination value again. And in such a case,
The incomplete combustion determining means 24 determines the number of occurrences of the incomplete combustion state such that 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.
Is counted using the count parameter K.

The count parameter K is set to "0" at the start of the combustion operation. Each time an incomplete combustion state in which the CO value rises or falls below the determination value within the detection timer time, the count parameter K becomes "0". The number of occurrences of such an incomplete combustion state is counted. When the value of the count parameter K reaches a predetermined value, in other words, when the incomplete combustion state in which the CO value rises or falls 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 and turns 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 abnormal data such as the O value in the EEPROM 29. In this case, an error display different from the above-described error contents may be displayed.

Thus, when the inlet 5 or the exhaust port 6 is partially clogged such that the incomplete combustion state occurs intermittently for a relatively short time, or when the inlet 5 or the exhaust port 6 is clogged. If the combustion amount of the gas burner 2 fluctuates frequently due to the gas amount proportional control in a state where the combustion has progressed to some extent, the combustion operation is stopped, and a situation in which incombustible gas is accumulated is avoided. Such a situation in which the incomplete combustion state occurs intermittently for a relatively short period of time and the combustion operation is stopped may occur due to the influence of wind or the like.
Since the abnormal data is not stored and stored, the user can restart the combustion operation without any trouble. When the incomplete combustion state occurs spontaneously due to a temporary wind or the like, the combustion operation continues without stopping.

The present invention is not limited to the above-described embodiment, and can be appropriately modified without departing from the gist of the present invention. For example, in the present embodiment, a water heater has been described as an example of a combustion device, but it is needless to say 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 incomplete combustion by the incomplete combustion detection means continues for a predetermined timer period, the combustion operation of the combustion equipment cannot be restarted. And when the detection of incomplete combustion by the incomplete combustion detection means is repeatedly performed for detection of incomplete combustion within a time period less than the timer time,
By temporarily stopping the combustion operation of the combustion equipment when the number of times of the detection reaches a predetermined number of times, a temporary incomplete combustion state due to the influence of wind or the like may occur sporadically. In such a case, it is possible to eliminate malfunctions such as stopping the combustion operation, and if continuous incomplete combustion occurs due to blockage of the exhaust passage, etc.
The combustion operation can be reliably stopped, and a situation in which the combustion operation is restarted in such a state can be avoided. Further, even when the exhaust passage or the like is partially clogged and the incomplete combustion state repeatedly and intermittently occurs for a short period of time, the combustion operation is stopped. A situation in which the operation is performed can be avoided, and when such a state occurs due to the influence of wind or the like, the combustion operation can be restarted without any 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 a blockage of the exhaust passage or the like, information indicating the occurrence is stored in the storage means and displayed on the display means, so that the user can display the information. Can take an appropriate action such as a repair request, and the trader who has received the repair request can quickly take an appropriate repair action.

[Brief description of the 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 diagram of a main part of FIG. 1;

FIG. 3 is a flowchart for explaining the operation of the water heater of FIG. 1;

FIG. 4 is a flowchart for explaining the operation of the water heater of FIG. 1;

[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 ... Display (display means).

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-184426 (JP, A) JP-A-6-323535 (JP, A) JP-A-61-295425 (JP, A) JP-A-5-184425 26440 (JP, A) Japanese Utility Model Showa 62-192063 (JP, U) Japanese Utility Model Showa 63-49165 (JP, U)

Claims (2)

(57) [Claims] In a combustion apparatus provided with incomplete combustion detection means for detecting incomplete combustion in a combustion section, it is monitored whether or not detection of incomplete combustion by the incomplete combustion detection means has continued for a predetermined timer time. The first incomplete combustion monitoring means and the second incomplete combustion for monitoring the number of times of incomplete combustion detection by the incomplete combustion detection means when the detection of incomplete combustion is completed within a time period less than the timer time. Monitoring means, when the detection of the incomplete combustion continues for the timer time, the combustion operation of the combustion device is stopped so as not to be restartable, and the number of repetitions of the detection of the incomplete combustion within a time less than the timer time. Operation control means for stopping the combustion operation of the combustion device when the number of times reaches a predetermined number. 2. A storage means for storing and holding information indicating that the incomplete combustion has been stopped unrestartably due to the continuation of the timer period, and information stored and held in the storage holding means. 2. The combustion device according to claim 1, further comprising a display unit for displaying the following.