JPH0875161A - Burner - Google Patents

Abstract

PURPOSE: To provide a combustion device which makes it possible to obtain a gas quantity equivalent to a required amount of combustion of a burner with high accuracy even if a ventilation passage in a combustion chamber is affected by outside wind or the like, and what is more, to prevent a harmful influence, such as the generation of imperfect combustion resultant from a clogging in the ventilation passage produced by a continuous operational failure. CONSTITUTION: A correction time detection means 29, which detects an elapsed time of a corrected state when the rotary speed of a combustion fan 10 is corrected with a correction means 28, is installed to a combustion device which is provided with the correction means 28 which is designed to correct the rotary speed of the combustion fan 10 so as to provide a target gas quantity when the amount of gas supply detected with a gas quantity sensor 13 differs from a target gas quantity, and a combustion stop means 27 is installed to stop the combustion of a burner when the corrected state continues longer than the specified time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion device such as a water heater.

[0002]

2. Description of the Related Art In a water heater, for example, the burner combustion amount required to match the hot water temperature detected by a hot water temperature sensor with a set temperature set by a user is calculated, and the rotation speed of a combustion fan is calculated as described above. Controls the set speed determined according to the required combustion amount, and controls the opening degree of the proportional valve provided in the fuel supply passage to the burner in the combustion chamber according to the required combustion amount or the actual rotation speed of the combustion fan. What is done is generally known.

In this type of combustion apparatus, it is assumed that the rotation speed of the combustion fan and the air flow rate (air supply quantity) to the burner by the combustion fan always correspond to each other in a constant relationship. It controls to the set rotation speed. However, in reality, the load on the combustion fan changes due to clogging of the exhaust passage, the influence of outside air, etc.In such a case, even if the rotation speed of the combustion fan is equal to the set value, the actual The air volume changes. Therefore, even if the rotation speed of the combustion fan is controlled to the set rotation speed that is determined according to the required combustion amount, the actual air flow rate to the burner is not always maintained at an appropriate amount.

Therefore, in this type of combustion device,
For example, using an air volume sensor (wind speed sensor) installed in the ventilation passage that communicates with the combustion chamber that houses the burner, monitor the blowing condition to the burner depending on whether the ventilation passage is clogged, etc., and respond to that blowing condition. It is known that the number of revolutions of the combustion fan is corrected so that the actual air flow rate to the burner becomes an appropriate air flow rate corresponding to the required combustion amount (for example, actual Kaihei 1-1295).
61, Japanese Utility Model Publication No. 60-143251).
In this case, the rotation speed of the combustion fan is corrected so that the air volume detected by the air volume sensor becomes the target air volume corresponding to the required combustion volume.

Further, generally, the energizing current of the fan motor for driving the combustion fan changes depending on the clogging condition of the ventilation passage and the like at any rotation speed of the combustion fan. Therefore, by utilizing this, the current flowing to the burner is detected by detecting the energizing current of the fan motor during air blowing, and the number of revolutions of the combustion fan is corrected according to the energizing current. The inventors of the present application have also considered that the actual air volume is controlled to be an appropriate air volume corresponding to the required combustion amount.

By correcting the number of revolutions of the combustion fan in accordance with the blowing condition in this manner, the burner can perform the required combustion even if it is affected by, for example, holes in the exhaust passage, disengagement, clogging of foreign matter, or outside air. It is possible to supply an appropriate amount of combustion air corresponding to the amount.

However, the influence of the outside wind is temporary and returns to the normal state when the wind is stopped, but the perforation of the ventilation passage, detachment, clogging of foreign matter, etc. are continuous. In particular, in the case of clogging of the exhaust passage, if the state where the exhaust passage has progressed to some extent continues, there is a possibility that the air pressure in the combustion chamber accommodating the burner becomes high and it becomes difficult to supply fuel.

[0008]

SUMMARY OF THE INVENTION The present invention aims to improve such a combustion apparatus. More specifically, even if the ventilation passage of the combustion chamber is affected by outside wind, the required combustion amount of the burner is reduced. Provided is a combustion device capable of accurately obtaining a corresponding air volume and capable of preventing an adverse effect such as incomplete combustion due to a continuous abnormality such as clogging of a ventilation path. The purpose is to do.

[0009]

In order to achieve the above object, the present invention blows a combustion fan for blowing air to a burner housed in a combustion chamber and an air amount corresponding to a required combustion amount of the burner to the burner. Rotation speed setting means for setting the rotation speed of the combustion fan, and fan driving means for driving the combustion fan at the rotation speed set by the rotation speed setting means,
Blower state monitoring means for grasping the state of air blown to the burner by the combustion fan, and the combustion so as to obtain an air volume corresponding to the required combustion amount of the burner according to the air blow state grasped by the air blow state monitoring means. In a combustion device including a correction unit that corrects the rotation speed of the fan, when the rotation speed of the combustion fan is corrected by the correction unit,
It is characterized by comprising a correction time measuring means for measuring the elapsed time of the correction state and a combustion stopping means for stopping the combustion of the burner when the elapsed time of the correction state continues for a predetermined time or more.

In this case, an air flow sensor for detecting the air flow to the burner by the combustion fan is provided, and the air blowing state monitoring means is provided with a target air flow rate to the burner which is predetermined corresponding to the required combustion amount of the burner. And the amount of difference between the detected air volume detected by the air volume sensor and the blown state to the burner, and the correction means corrects the rotation speed of the combustion fan according to the difference between the target air volume and the detected air volume. It is characterized by doing.

Alternatively, the fan driving means includes a fan motor for driving the combustion fan to rotate, and a current sensor for detecting an energization current of the fan motor, and the blown state monitoring means corresponds to the set rotational speed. Then, the blower state to the burner is grasped by the difference amount between the predetermined reference energizing current of the fan motor and the detected energizing current detected by the current sensor, and the correcting means determines the reference energizing current and the detected energizing current. The number of revolutions of the combustion fan is corrected according to the difference between

Further, the correction time measuring means indicates the correction state when the rotation speed of the combustion fan corrected by the correction means deviates from a predetermined range based on the set rotation speed. It is characterized by measuring the elapsed time.

Alternatively, in the case of using the air volume sensor, the correction time measuring means has a ratio between the air volume detected by the air volume sensor and the rotation speed of the combustion fan corrected by the correction means, It is characterized in that the elapsed time of the correction state is measured when a deviation from a predetermined range based on the ratio between the target air volume and the set rotational speed is taken as a reference.

[0014]

According to the present invention, although the combustion fan that blows air to the burner in the combustion chamber is basically rotated at the set number of revolutions for blowing the air volume corresponding to the required combustion amount of the burner, When the state of air blown to the burner by the combustion fan, which is grasped by the air blow state monitoring means, is affected by outside air, clogging of the ventilation passage of the combustion chamber or perforation, etc. By correcting the number of revolutions by the correction means, the burner is supplied with an air volume corresponding to the required combustion amount. At this time, when the outside wind is affected, the outside wind is temporary, so the correction state of the rotation speed of the combustion fan by the correction means is canceled in a relatively short time. On the other hand, if the ventilation passage is clogged or a hole is formed, the correction state of the rotation speed of the combustion fan continues. Therefore, in the case of clogging or perforation of the ventilation passage, the elapsed time of the correction state of the rotation speed of the combustion fan measured by the correction time measuring means continues beyond the predetermined time, so that the combustion is stopped. Burner combustion is stopped by means. Then, in the case of being affected by a temporary outside wind that is shorter than the predetermined time, the elapsed time of the correction state of the rotation speed of the combustion fan falls within the predetermined time, and the combustion of the burner is stopped by the combustion stopping means. The combustion of the burner continues without being stopped.

The state of air blown by the combustion fan is detected by, for example, the air flow rate of the combustion fan using the air flow rate sensor, and the amount of difference between the detected air flow rate and a target air flow rate determined in advance corresponding to the required combustion amount of the burner. It is possible to grasp. In this case, the correction of the rotation speed of the combustion fan by the correction unit is performed according to the amount of difference between the detected air amount and the target air amount, so that the air amount corresponding to the required combustion amount of the burner is obtained.

Alternatively, the state of air blown by the combustion fan is
It is also possible to detect the energizing current of the fan motor by the current sensor and grasp it by the amount of difference between the detected energizing amount and the reference energizing current that is predetermined corresponding to the set rotation speed of the combustion fan. In this case, the correction of the rotation speed of the combustion fan by the correction unit is performed according to the amount of difference between the detected energization current and the reference energization current, so that the air volume corresponding to the required combustion amount of the burner is obtained.

Even if the ventilation passage is not clogged, it is caused by, for example, a detection error of an air flow sensor or a current sensor for monitoring the blowing condition, a control error of the rotation speed of the combustion fan, or the like. Thus, the correction state of the rotation speed of the combustion fan may continue, but in such a case, it is preferable to continue the combustion of the burner originally. Therefore, in consideration of the case where the correction state of the rotation speed of the combustion fan continues in such a state that it is preferable to continue the combustion of the burner, a predetermined range based on the set rotation speed of the combustion fan is set in advance. If the combustion fan is corrected within the predetermined range, the correction time measuring means does not measure the elapsed time of the correction state and the combustion of the burner is continued. When the correction state of the rotation speed of the combustion fan continues due to the detection error of the air flow sensor, the current sensor, etc., the control error of the rotation speed of the combustion fan, the combustion of the burner continues. Then, when the rotation speed of the combustion fan is corrected outside the predetermined range, the correction time measuring means measures the elapsed time of the correction state, and when the correction state continues for a predetermined time or more, Assuming that the correction state is due to clogging or perforation of the ventilation path,
The combustion of the burner is stopped by the combustion stopping means.

Further, in the case of monitoring the air blowing state using the air volume sensor, the ratio between the air volume detected by the air volume sensor and the rotation speed of the combustion fan corrected by the correction means is equal to the target air volume. When a deviation from a predetermined range based on the ratio to the set rotational speed is used, by measuring the elapsed time of the correction state by the correction time measuring means, as in the above case, the air flow sensor and the current When the combustion fan speed continues to be corrected due to a detection error of the sensor or a control error of the combustion fan speed, etc., the burner combustion is continued, and the ventilation passage is blocked. Moreover, it becomes possible to stop the combustion of the burner.

[0019]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a system configuration diagram of the combustion apparatus of this embodiment, and FIG. 2 is a block configuration diagram of a main part of the combustion apparatus of FIG.

The combustion apparatus of this embodiment is a water heater, and
In the figure, 1 is a heat exchanger 2 and a burner 3 for heating the heat exchanger 2.
Water heater main body having a built-in water heater, 4 is a water pipe piped through the heat exchanger 2, 5 is a flow sensor for detecting the flow rate of water flowing through the water pipe 4 on the upstream side of the heat exchanger 2, and 6 is heat exchange A temperature sensor for detecting the temperature at which the water flowing through the water pipe 4 flows downstream of the vessel 2, 7 is a gas supply pipe for supplying gas to the burner 3,
Reference numeral 9 denotes an open / close solenoid valve and a gas proportional valve which are sequentially provided in the gas supply pipe 7 from the upstream side thereof, 10 denotes a combustion fan for blowing combustion air to the burner 3, 11 denotes a fan motor for driving the combustion fan 10, and 12 Is a rotation speed sensor composed of a Hall element or the like for detecting the rotation speed of the combustion fan 10,
Reference numeral 13 is an air flow sensor such as a hot-wire air flow sensor provided in the air supply passage 14 from the combustion fan 10 to the burner 3, 15 is an operating unit for the user to set the hot water temperature, and 16 is an operating unit 15 The fan motor 1 according to the set temperature of the hot water set by
1, a controller for controlling the gas proportional valve 9, etc., 17 is an igniter for igniting the burner 3, and 18 is the burner 3
It is a frame rod that detects the combustion state such as the presence or absence of misfire.

The upstream side of the water flow pipe 4 is connected to a water pipe (not shown), and the downstream side is connected to a hot water supply tap (not shown) of a kitchen or a bathroom. The burner 3 is housed in a combustion chamber 1a in the water heater main body 1, and the combustion chamber 1a is communicated with the air supply passage 14 and an exhaust passage provided in an upper portion of the water heater main body 1. 1b is connected.

Further, the controller 16 is composed of an electronic circuit including a microcomputer and the like, and has a basic functional configuration as shown in FIG. It is necessary to match the tap water temperature with the set temperature from the tap water temperature detected by the tap water temperature sensor (not shown), the tap water temperature detected by the temperature sensor 6, and the flow rate detected by the flow rate sensor 5. A required combustion amount calculation unit 19 for determining the required combustion amount of the burner 3 and a target air amount (combustion air supply amount) from the combustion fan 10 to the burner 3 according to the required combustion amount calculated by the calculation unit 19 are set. The air flow rate setting unit 20 is provided. Further, a fan control unit that controls the rotation speed of the combustion fan 10 via the fan motor 11 according to the target air volume set by the air volume setting unit 20, the actual air volume of the combustion fan 10 detected by the air volume sensor 13, and the like. 21
And the air volume setting unit 20 provided in the fan control unit 21.
A rotation speed setting unit 23 (rotation speed setting means) for setting the rotation speed of the combustion fan 10 according to a predetermined data table or the like according to the target air volume set by
The fan drive unit 24 (fan drive unit) that drives the fan motor 11 at the set rotation speed and the fan control unit 21 are also provided, and the target air volume cannot be obtained by the rotation speed set by the rotation speed setting unit 23. In case of combustion fan 1
A correction unit 28 (correction unit) that corrects the rotational speed of 0 according to the air volume detected by the air volume sensor 13, and the correction rotational speed of the combustion fan 10 that is also provided in the fan control unit 21 and is corrected by the correction unit 28. Separately, the rotation speed setting unit 23
And a correction range setting unit 25 that sets an allowable range of the correction rotation speed of the combustion fan 10 according to a data table or the like that is set in advance on the basis of the set rotation speed according to. Furthermore, the rotation speed sensor 12 detects the rotation speed of the combustion fan 10 detected by the rotation speed sensor 12, and a monitoring unit 26 that monitors whether the rotation speed is within an allowable range set by the correction range setting unit 25. A correction time measuring unit 29 (correction time measuring means) for starting time measurement when the rotation speed of the combustion fan 10 deviates from the allowable range, and the rotation speed sensor 1
2, a valve control unit 22 that controls the opening of the gas proportional valve 9 according to the number of revolutions of the combustion fan 10 and the like, which controls the gas supply amount to the burner 3, and the correction time counting unit 29. The fan control unit 21 according to the corrected time
And a stop command unit 27 (combustion stopping means) for stopping the combustion fan 10 via the solenoid valve and cutting off the gas supply to the burner 3 via the solenoid valve 8. Here, the correction unit 28 includes an air blowing state monitoring unit that monitors the air blowing state of the combustion fan 10 to the burner 3 based on the air amount detected by the air amount sensor 13 and the target air amount set by the air amount setting unit 20. .

Incidentally, when the water flow of the water pipe 4 is started, the controller 16 detects this through the flow rate sensor 5,
In response to the detection of water flow, the fan controller 21 rotationally drives the combustion fan 10 via the fan motor 11, and
The solenoid valve 8 of the gas supply pipe 7 is opened to start the gas supply to the burner 3, and the burner 3 is ignited via the igniter 17, whereby the hot water supply operation is started.

When the flow sensor 5 detects that the water flow through the water pipe 4 is stopped, the controller 16 causes the solenoid valve 8 to operate.
Is closed to cut off the gas supply to the burner 3, and the fan controller 21 stops the combustion fan 10 to terminate the hot water supply operation. The operation of terminating the hot water supply operation is also performed when the flame rod 18 detects a misfire or the like of the burner 3 during the hot water supply operation.

Next, the operation of the water heater of this embodiment will be described.

When the hot water supply operation is started as described above, the controller 16 is required by the required combustion amount calculation unit 19 to match the hot water discharge temperature detected by the temperature sensor 6 with the set temperature set by the operation unit 15. The required combustion amount of the burner 3 is obtained every moment based on the detection data of the incoming water temperature, the outgoing hot water temperature and the flow rate by the temperature sensor 6 and the flow rate sensor 5. Further, the air flow rate setting unit 20 of the controller 16 sets a target air flow rate from the combustion fan 10 to the burner 3 corresponding to the required combustion amount calculated by the required combustion amount calculation unit 19 according to a predetermined data table or the like.

Next, the controller 16 controls the combustion fan 10 by the fan controller 21. That is,
The rotation speed setting unit 23 sets the rotation speed of the combustion fan 10 corresponding to the target air volume according to a predetermined data table or the like, and the fan driving unit 24 sets the rotation speed by the fan motor 11 via the fan motor 11.
Drive. The above set rotational speed can blow a proper target air volume corresponding to the required combustion amount to the burner 3 when the air supply passage 14 and the exhaust passage 1b are normal or when there is no influence of outside air. This is the rotation speed of the combustion fan 10.

At this time, the correction unit 28 of the fan control unit 21
Corrects the rotation speed of the combustion fan 10 when the air volume detected by the air volume sensor 13 is different from the target air volume. That is, when the detected air volume is smaller than the target air volume, the number of revolutions of the combustion fan 10 is increased more than the initial number of revolutions (set number of revolutions) to increase the air volume according to the deviations, and in the opposite case. Reduces the rotation speed of the combustion fan 10 below the initial rotation speed (set rotation speed) in accordance with the deviation between the detected air flow rate and the target air flow rate. As a result, the rotation speed of the combustion fan 10 is corrected so that the target air volume and the actual air volume match.

On the other hand, the valve controller 22 of the controller 16
In parallel with controlling the combustion fan 10 as described above, controls the opening of the gas proportional valve 9 to control the gas supply amount to the burner 3. In this case, basically, the valve control unit 2
2 is a combustion fan 1 detected by the rotation speed sensor 12.
The opening of the gas proportional valve 9 is controlled according to the actual rotational speed of zero. Therefore, when the exhaust passage 1b and the air supply passage 14 are normal and are not affected by the external wind, the rotation speed of the combustion fan 10 and the actual air volume correspond to each other. Gas proportional valve 9 according to the rotation speed of the combustion fan 9
The amount of gas supplied to the burner 3 is controlled by controlling the opening degree of
It corresponds to the air volume to the burner 3 controlled by the target air volume, and the burner 3 burns with the required combustion amount. Further, in the exhaust passage 1b, when the air volume of the combustion fan 10 fluctuates due to clogging of the air supply passage 14 or the influence of outside air, the rotation speed of the combustion fan 10 is equal to the actual air volume as described above. Since the correction is performed so as to match the target air volume, the rotation speed of the combustion fan 10 increases or decreases. Therefore, if the opening of the gas proportional valve 9 is simply controlled according to the rotation speed of the combustion fan 10, the opening of the gas proportional valve 9 changes in accordance with the rotation speed of the combustion fan 10, and the burner 3 The amount of gas supply changes. Therefore, when the air volume detected by the air volume sensor 13 is smaller than the target air volume in order to offset the correction amount of the rotational speed of the combustion fan 10, the valve control unit 22 of the controller 16 determines the rotational speed of the combustion fan 10 as described above. Therefore, the opening of the gas proportional valve 9 is made smaller than the opening corresponding to the rotation speed of the combustion fan 10, and in the opposite case, the opening of the gas proportional valve 9 is rotated. Increase the opening rather than the number. As a result, the gas supply amount to the burner 3 corresponds to the required combustion amount of the burner 3, and the burner 3 burns smoothly with the required combustion amount. It should be noted that such cancellation is not necessary in the proportional valve preceding type and parallel type, which are not the above fan preceding type.

By the way, when the rotation speed of the combustion fan 10 is corrected as described above, when it is affected by the outside air, or the air supply passage 14 and the exhaust passage 1b are clogged,
There is a case where a hole is formed, a disconnection or the like occurs. Especially, when the exhaust passage 1b is clogged, there is a possibility that incomplete combustion or the like may occur as described above, so it is necessary to prevent this. There is. At this time, for example, when the exhaust passage 1b is perforated or disengaged, when the combustion fan 10 is rotated at the set rotational speed, the detected air volume becomes larger than the target air volume, and in the case of clogging, the target air volume becomes On the other hand, the detected air volume becomes small. The controller 16 sets the allowable range of the corrected rotation speed of the combustion fan 10 by the correction range setting unit 25 according to a predetermined data table or the like with the rotation speed set by the rotation speed setting unit 23 as a reference. Here, the allowable range is the combustion fan 10 provided corresponding to each set rotational speed associated with each time the target air volume is set.
Is a permissible correction range of the rotation speed of the
Even if the correction state is continued due to a detection error due to contamination of No. 3 or an error in controlling the number of revolutions of the combustion fan 10, a predetermined number of revolutions of the combustion fan 10 is set so as not to stop combustion. It is a range.

When the rotation speed of the combustion fan 10 is corrected as described above, the corrected combustion fan 10 is corrected.
Of the combustion fan 10 based on the rotation speed detected by the rotation speed sensor 12, and the rotation speed of the combustion fan 10 detected by the rotation speed sensor 12 deviates from the permissible range. The time counting unit 29 measures the correction time. If the deviation is within a predetermined time due to a temporary effect of outside wind, the correction time measuring unit 29 stops the time measurement, but when the deviation exceeds the predetermined time, the stop command unit 27
Stop burning.

As described above, the controller 16 corrects the rotation speed of the combustion fan 10 so that not only the target air volume suitable for the combustion of the burner 3 is blown to the burner 3, but also incomplete combustion may occur. Exhaust passage 1
In the case of continuous occurrence such as clogging of b, combustion of the burner 3 is stopped to prevent such inconvenience from occurring. Then, for example, when the rotation speed of the combustion fan 10 is corrected due to a temporary influence of the outside air, the correction is performed outside the permissible range for a temporary time. The time counting by the time counting unit 29 is stopped within the predetermined time, and therefore the combustion of the burner 3 continues without any trouble.

In this embodiment, the air flow sensor 13 is used to monitor the blowing condition of the combustion fan 10 and
However, the energization current of the fan motor 11 is detected using the current sensor 11a (see FIG. 2), and the set rotation of the combustion fan 10 is determined according to the detected energization current and the required combustion amount. The number of revolutions of the combustion fan 10 according to a deviation (amount of difference) from a predetermined reference energizing current corresponding to the number (current flowing through the fan motor 11 at the set number of revolutions when the exhaust passage 1b etc. are normal). May be corrected. In this case, for example, when the exhaust passage 1b is clogged, the energizing current of the fan motor 11 decreases, so the rotation speed of the combustion fan 10 is increased according to the degree of decrease.

Next, another embodiment of the present invention will be described with reference to FIGS.
Will be described with reference to. FIG. 3 is a block diagram of a main part of the apparatus of this embodiment, and FIG. 4 is a diagram for explaining the operation of the apparatus of this embodiment. The air blower of this embodiment is provided in the water heater of FIG. 1, and the system configuration of the water heater is the same as that of FIG. In the following description, the same components as those of the water heater of FIG. 1 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the water heater provided with the combustion device of the present embodiment, the controller 16 shown in FIG. 1 has the required combustion amount calculation section 19, the air flow rate setting section 20, as in the case of the above embodiment.
The fan control unit 21, the monitoring unit 26, the correction time counting unit 29,
A valve control unit 22 and a stop command unit 27 are provided. The fan control unit 21 includes a rotation speed setting unit 2 as in the above embodiment.
3, fan drive unit 24, correction unit 28, correction range setting unit 2
5 are provided.

The controller 16 of the present embodiment is provided with the air volume and rotation speed sensor 12 detected by the air volume sensor 13.
A calculation unit 30 is newly provided to calculate the ratio with the rotation speed detected by.

Further, in the water heater of this embodiment, the operations of the required combustion amount calculation unit 19, the air flow rate setting unit 20, the valve control unit 22, and the stop command unit 27 are the same as those in the above-described embodiments.

The operation of the water heater according to this embodiment, which is different from the water heater according to the above-described embodiment, will be described below.

In the water heater of this embodiment, the fan control section 21 of the controller 16 has the same structure as that of the above-mentioned embodiment.
Basically, the correction unit 28 of the fan control unit 21 burns the target air volume so that the target air volume and the actual air volume detected by the air volume sensor 13 match when the air volume detected by the air volume sensor 13 is different from the target air volume. The rotation speed of the fan 10 is corrected.

At this time, the correction range setting unit 25 of the controller 16 sets the permissible range of the ratio value of the air volume to the rotation speed with reference to the ratio value of the rotation speed set by the rotation speed setting unit 23 and the target air volume. Set. Here, the allowable range refers to, for example, as shown in FIG. 4, when a reference line a having a slope of the ratio between the target air volume and the set rotational speed is shown, a detection error due to dirt or the like of the air volume sensor 13 or the combustion fan 10 Even if the correction state is continued due to the control error of the number of revolutions, the range is a predetermined range b so that the combustion is not stopped.

Next, the calculating section 30 detects the corrected rotation speed of the rotation speed sensor 12 of the combustion fan 10, and
The value of the ratio with the air volume detected by the air volume sensor 13 is obtained. Then, the monitoring unit 26 monitors whether the value of the calculating unit 30 is within the range b, and when the value deviates from the range b, the correction time measuring unit 29 measures the correction time. With this configuration, even if both the air volume detected by the air volume sensor 13 and the rotational speed of the combustion fan 10 that is corrected accordingly change momentarily, the correction state of the rotational speed of the combustion fan 10 can be reliably monitored. The burner 3 can be stopped in the case of clogging of the exhaust passage 1b which may cause incomplete combustion and the like, while the burner 3 can be stopped in the case of being temporarily affected by outside wind or the like. Can continuously perform good combustion.

The combustion apparatus of the present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made. For example, in the above embodiment,
Although the correction duration for stopping the combustion is constant regardless of the combustion amount, it may be shortened as the combustion amount increases.

Further, in the above embodiment, the correction time counting unit 2
In No. 9, the timing is measured only when the rotation speed of the combustion fan 10 detected by the rotation speed sensor 12 deviates from the permissible range. May be.

The allowable range of correction of the rotational speed of the combustion fan 10 is, for example, that the degree of clogging of the exhaust passage 1b and the air supply passage 14 is low, and the burner 3 is properly adjusted while correcting the rotational speed of the combustion fan 10. The range may be such that combustion can be sufficiently performed.

[0045]

As is apparent from the above description, according to the present invention, when the combustion fan operates, the rotation speed of the combustion fan is controlled by the correction means in accordance with the air blowing state monitored by the air blowing state monitoring means. When the appropriate amount of air corresponding to the required amount of combustion is corrected so that it is blown, and when the elapsed time measured by the correction time measurement means continues for a predetermined time or more in that correction state, the burner is stopped by the combustion stop means. When the combustion is stopped, the burner combustion is accurately stopped in a state where there is a possibility that incomplete combustion or other inconvenience may occur due to clogging, perforation, disconnection, etc. of the air passage, and such inconvenience is caused. In addition, it is possible to prevent the generation of air, and when the blown condition is temporarily affected by temporary outside air, etc. Good combustion of the burner can be continuously carried out while blowing in over Na.

Then, the blowing state of the combustion fan is grasped by using the air volume sensor, and the number of revolutions of the combustion fan is determined according to the difference between the detected air volume and the target air volume preset corresponding to the required combustion volume of the burner. Or to detect the fan motor energization current with a current sensor to ascertain the blowing state of the combustion fan, and according to the difference between the detected energization current and the reference energization current corresponding to the set rotation speed of the combustion fan. By correcting the rotation speed of the combustion fan by means of the above, the rotation speed of the combustion fan can be corrected accurately.

Further, if a predetermined range based on the set rotation speed of the combustion fan is set in advance and the combustion fan is corrected at a rotation speed within the predetermined range, a correction state by the correction time measuring means is obtained. When the rotation speed of the combustion fan is corrected by deviating from the predetermined range without measuring the elapsed time, the correction time is measured by the correction time measuring means to measure the correction state. Even if is continued for a predetermined time or more, if it is within the predetermined range, the combustion is not stopped, so it is preferable to continue the combustion of the burner when the correction state continues due to the detection error of the air volume sensor etc. It is possible to prevent the combustion from stopping in this state, and to reliably stop the combustion of the burner when there is a risk of incomplete combustion, etc. It can be provided.

In the case where the air flow sensor is used to monitor the blown air condition, a predetermined range based on the ratio between the target air flow rate and the set rotational speed is set, and the air flow rate detected by the air flow sensor and the combustion fan are set. If the ratio to the corrected number of revolutions is within the predetermined range, the correction time measuring means does not measure the elapsed time of the correction state, and if the ratio deviates from the predetermined range, the correction time measuring means Even if the number of revolutions of the combustion fan for sending an appropriate amount of air to the burner fluctuates from moment to moment by measuring the elapsed time of the correction state by It is possible to accurately measure the time, and like the case described above, it is possible to prevent the combustion from being stopped in a state where it is preferable to continue the combustion of the burner,
It is possible to reliably stop the combustion of the burner when there is a risk of incomplete combustion or the like, and it is possible to provide a combustion device with excellent usability.

Therefore, according to the present invention, even if the ventilation passage of the combustion chamber is affected by the external wind, the air volume corresponding to the required combustion amount of the burner can be accurately obtained, and the ventilation passage is clogged. It is possible to provide a combustion device capable of preventing adverse effects such as occurrence of incomplete combustion due to continuous abnormalities such as the above.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a combustion apparatus according to an embodiment of the present invention.

FIG. 2 is a block configuration diagram of a main part of the combustion device of FIG.

FIG. 3 is a block configuration diagram of a main part of an apparatus according to another embodiment of the present invention.

FIG. 4 is a diagram for explaining the operation of the apparatus of FIG.

[Explanation of symbols]

3 ... Burner, 10 ... Combustion fan, 11a ... Current sensor,
13 ... Air flow sensor, 23 ... Rotation speed setting means, 24 ... Fan driving means, 27 ... Combustion stopping means, 28 ... Correction means, 2
9 ... Correction time measuring means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masayoshi Takayama 2-26 Fukuzumi-cho, Nakagawa-ku, Nagoya-shi, Aichi Linnai Co., Ltd. (72) Masakazu Ando 2-26 Fukuzumi-cho, Nakagawa-ku, Nagoya, Aichi Inside Linnai Co., Ltd. (72) Inventor Hideo Okamoto 2-26 Fukuzumicho, Nakagawa-ku, Nagoya, Aichi Prefecture

Claims (5)

[Claims] 1. A combustion fan for blowing air to a burner housed in a combustion chamber, and a rotation speed setting means for setting the rotation speed of the combustion fan for blowing to the burner an air flow corresponding to a required combustion amount of the burner. A fan driving means for driving the combustion fan at a rotational speed set by the rotational speed setting means, an air blowing state monitoring means for grasping an air blowing state of the combustion fan to the burner, and an air blowing state monitoring means. In a combustion device including a correction unit that corrects the rotation speed of the combustion fan so as to obtain an air volume corresponding to the required combustion amount of the burner according to the blowing condition, the rotation speed of the combustion fan is corrected by the correction unit. Correction time measuring means for measuring the elapsed time of the correction state when corrected by
A combustion device, comprising: a combustion stopping means for stopping the combustion of the burner when the elapsed time in the correction state continues for a predetermined time or more. 2. An air flow sensor for detecting an air flow to the burner by the combustion fan, wherein the blower condition monitoring means sets a target air flow to the burner which is predetermined corresponding to a required combustion amount of the burner. The blown state to the burner is grasped by the amount of difference from the detected air amount detected by the air amount sensor, and the correction means corrects the rotation speed of the combustion fan according to the amount of difference between the target air amount and the detected air amount. The combustion apparatus according to claim 1, wherein: 3. The fan driving means comprises a fan motor for rotationally driving the combustion fan, and a current sensor for detecting an energization current of the fan motor, and the blown state monitoring means corresponds to the set rotational speed. Then, the blower state to the burner is grasped by the difference amount between the predetermined reference energizing current of the fan motor and the detected energizing current detected by the current sensor, and the correcting means determines the reference energizing current and the detected energizing current. 2. The combustion apparatus according to claim 1, wherein the rotation speed of the combustion fan is corrected according to the amount of difference between 4. The correction time measuring means indicates the correction state when the rotation speed of the combustion fan corrected by the correction means deviates from a predetermined range based on the set rotation speed. The combustion device according to claim 1, wherein the elapsed time is measured. 5. The correction time measuring means is configured such that a ratio between the air volume detected by the air volume sensor and the rotation speed of the combustion fan corrected by the correction means is a ratio between the target air volume and the set rotation speed. The combustion apparatus according to claim 2, wherein the elapsed time of the correction state is detected when a deviation from a predetermined range determined on the basis of the above is detected.