KR0154373B1 - Combustion device - Google Patents

Abstract

The present invention provides a combustion apparatus capable of distinguishing the clogging of the exhaust port from the clogging of the air supply port and enabling accurate operation corresponding thereto. The configuration corresponds to the initial detected wind amount obtained by the air volume sensor 13 in response to the predetermined rotation speed of the combustion fan 10 at the beginning of the combustion operation, and correspondingly to the predetermined rotation speed of the combustion fan 10 during subsequent combustion. Air volume change detection means 26 for obtaining a difference between the amount of combustion air during combustion obtained by the air flow sensor 13, and an operation stop means 27a for stopping the combustion operation when the difference in the detected air flow amount exceeds a predetermined value; do. In the case of the blockage of the exhaust port, the combustion operation is automatically stopped when the difference in the detected air volume exceeds a predetermined value, and in other cases, the combustion operation is continued. In the combustion operation, the rotation speed of the combustion fan 10 is controlled so that the detected air volume of the air volume sensor 13 matches the set air volume.

Description

Combustion device

1 is a system configuration diagram of a combustion device (water heater) which is an example of the first aspect of the present invention.

2 is a block diagram illustrating main parts of the hot water heater of FIG.

3 is a block diagram of a combustion device (water heater) of another example of the first aspect of the present invention.

4 is a block diagram of a combustion device (water heater) which is an example of the second aspect of the present invention.

5 is a diagram showing the relationship between the combustion fan rotation speed and the air volume of the hot water heater of FIG.

* Explanation of symbols for main parts of the drawings

3: burner 10: combustion fan

13: air flow sensor 18: combustion chamber

19: exhaust port 20: air supply

26: air flow change amount calculation means 27a: operation stop means

28: fan control means 29: deviation calculation means

30: memory means 31: reference speed setting means

39: first calculation means 40: second calculation means

The present invention relates to a combustion device such as a hot water heater.

For example, in a hot water heater, the amount of combustion of the burner required to match the tapping temperature detected by the tapping temperature sensor to a set temperature set by the user is determined at a time, and the rotation speed of the combustion fan for supplying combustion air to the burner is determined. It is generally known to control the opening speed of the proportional valve installed in the fuel supply path to the burner in accordance with the required rotation speed determined in accordance with the required combustion amount and the actual rotation speed of the combustion fan.

This type of combustion apparatus controls the rotation speed of the combustion fan to the indicated rotation speed on the premise that the rotation speed of the combustion fan and the air flow rate (air supply amount) from the combustion fan to the burner always correspond to each other in a constant relation. In reality, if the load of the combustion fan where the supply port of the combustion chamber containing the burner or the exhaust port is blocked is changed in the normal state, the actual air flow from the combustion fan to the burner is normal even though the rotation speed of the combustion fan is the same. Compared to

Therefore, in recent years, the actual air flow to the burner is detected every time according to the air flow sensor disposed in the air flow passage from the combustion fan to the burner, and the number of revolutions of the combustion fan is made so that the detected air flow corresponds to the set air flow corresponding to the required combustion amount of the burner. Is proposed (see, for example, JP-A-129561, JP-A-60-143251).

However, by controlling the combustion fan rotation speed using the airflow sensor as described above, even if the supply and exhaust ports of the combustion chamber are blocked to some extent, it is possible to supply the airflow corresponding to the required combustion amount of the burner from the combustion fan to the burner. In particular, when the blockage of the exhaust port is advanced to some extent, the following situation occurs.

That is, in the gas water heater, for example, if the clogging of the exhaust port proceeds to some extent, since the exhaust gas in the combustion chamber is not smoothly made, the pressure in the combustion chamber is increased. In this case, by controlling the combustion fan so that the air flow from the combustion fan to the burner matches the set air flow rate as described above, the air flow to the burner can correspond to the required combustion amount of the burner. Even if the opening degree of the proportional valve is controlled to supply one fuel gas to the burner, the air pressure in the combustion chamber becomes higher than the pressure of the fuel gas, making it difficult to eject the fuel gas from the burner. Therefore, it is difficult for the burner to supply an appropriate amount of fuel gas to the amount of air flow therein, making it difficult to obtain an appropriate amount of fuel, and at the same time, incomplete combustion may occur. Moreover, if the blockage of the exhaust port progresses to some extent, a part of the exhaust gas may not be exhausted from the combustion chamber to an appropriate place such as outdoors through the exhaust port, but may leak to an inappropriate place such as indoors.

Therefore, when clogging of the exhaust port of the combustion chamber occurs, it is required to automatically grasp this by any method and to stop the combustion operation. In addition, it is preferable that the blockage of the air supply port continues the combustion operation without causing the above situation even if this progresses to some extent.

Under such a background, the inventors of the present invention have made the following findings as a result of examining the relationship between the combustion fan rotation speed and the actual air volume when the exhaust or the air supply blockage occurs.

In other words, the relationship between the combustion fan rotation speed and the actual air volume has a relationship as shown by the solid line a in FIG. 5 in a normal state in which there is no clogging of the exhaust or air supply. In the case of clogging of the exhaust or air supply, for example, there is a relationship as shown by the solid line b in FIG. 5, and the air flow rate according to the arbitrary rotation speed is small compared to {solid line b) when it is normal. Lose. In such a case, the slope of the solid line b (the value of the air volume ratio to the rotational speed) basically decreases as the degree of blockage of the exhaust or air supply is larger, but this tendency is observed even when both the exhaust port and the air supply are blocked. It is the same.

On the other hand, in the case of clogging of the air supply port in one combustion operation, the relationship between the rotation speed of the combustion fan and the actual air volume does not change so much from the beginning to the end of the combustion operation. However, in the case of the blockage of the exhaust port, the relationship between the combustion fan rotation speed and the actual air volume is at the initial stage of the combustion operation. The relationship as shown by the virtual line c in FIG. That is, in the case of the blockage of the exhaust port, the air volume at an arbitrary rotation speed is relatively lower than the initial stage of the combustion operation at the stage where the combustion operation is advanced, and the straight slope showing the relationship between the combustion fan rotation speed and the air volume In the stage in which the combustion operation has progressed to some extent, it is relatively lower than the initial stage of the combustion operation. The reason can be considered as follows. That is, when the combustion operation proceeds, the temperature in the combustion chamber rises significantly with respect to the initial combustion operation, and the exhaust gas expands. When the exhaust port is clogged, the exhaust resistance is also greatly increased to increase the load of the combustion fan, and the amount of air at any rotational speed is relatively lower than the initial stage of the combustion operation. On the other hand, in the case of the blockage of the air supply, the exhaust gas is smoothly discharged. Therefore, even if the combustion operation proceeds, the exhaust gas temperature does not increase much compared with the initial combustion operation. It does not change much from the beginning to the end of operation.

Therefore, by monitoring the change of the actual air volume and the air flow rate ratio with respect to the rotational speed at an initial stage and a somewhat advanced stage at any predetermined rotational speed during combustion operation, the blockage of the exhaust port can be prevented from being blocked. We think that we can distinguish separately.

The present invention has been carried out in view of such a background, and in the combustion apparatus which controls the combustion fan rotation speed so that the detected air volume by the air flow sensor matches the set air flow rate, the clogging of the exhaust port can be grasped from the clogging of the air supply port, Accordingly, an object of the present invention is to provide a combustion device capable of accurate operation.

In order to achieve this object, a first aspect of the present invention provides a combustion chamber including a burner, an air supply port and an exhaust port connected to the combustion chamber, and combustion provided on the air supply side for blowing combustion air to the burner. A fan, a wind flow sensor for detecting the flow of air from the combustion fan to the burner, and the detected wind flow detected by the wind flow sensor during the combustion operation of the burner to match the set wind flow for obtaining the required burn amount of the burner; A combustion apparatus having fan control means for controlling the rotation speed of a combustion fan, comprising: an initial detection amount obtained by the air flow sensor corresponding to a predetermined rotation speed of the combustion fan at the beginning of the combustion operation of the burner, and then the The amount of change of the air to obtain the amount of change between the detected amounts of combustion wind during the burner, which is obtained by the flow rate sensor, corresponding to the predetermined rotational speed of the combustion fan during combustion of the burner. College math; And an operation stop means for stopping the combustion operation when the amount of change between the initial detection amount obtained by the air volume change amount calculating means and the amount of change in the detected air amount during combustion exceeds a predetermined amount.

The fan control means includes: storage means which has previously recorded and held the relationship between the air volume of the combustion fan and the rotational speed as reference data when the load of the combustion fan is normal; Reference speed setting means for obtaining a reference speed of a combustion fan corresponding to the set air volume on the basis of the reference data during burner combustion operation; Deviation calculation means for calculating a deviation between the set air flow rate and the detected air flow amount obtained by the air flow sensor; and at the same time, continuously controlling the combustion fan speed using the reference speed as the reference command speed, By correcting the number of revolutions of the combustion fan in accordance with the deviation between the air volume and the detected air volume, the combustion fan is controlled so that the detected air volume corresponds to the set air volume, and the air volume change amount calculating means starts the start of the combustion operation of the burner. In the initial deviation obtained by the deviation calculating means corresponding to the predetermined set wind speed at which the reference rotational speed becomes the predetermined rotation speed, and during the burning of the burner, the deviation calculation means corresponding to the predetermined set wind speed. Characterized in that the difference between the deviation during combustion is obtained as the amount of change between the initial detected air volume and the detected air volume during combustion. All.

The fan control means further includes means for controlling the combustion fan rotational speed to the predetermined rotational speed at the beginning of the combustion operation, and the air volume obtained by the reference data corresponding to the predetermined rotational speed during the control. Means for providing the deviation calculating means as a predetermined set amount of air, and the air volume change calculating means outputs from the deviation calculating means when the combustion fan is controlled at the predetermined rotational speed at the beginning of the combustion operation. Means for obtaining a deviation which is obtained as the initial deviation and the reference rotational speed corresponding to a set wind speed for obtaining the required combustion amount by the fan control means during subsequent burner combustion, when the combustion fan is controlled in the deviation calculation means. The deviation during combustion is multiplied by the ratio (NO / NX) of the ratio between the reference rotational speed Nx and the predetermined rotational speed NO. It is characterized by including the means for obtaining.

Or the fan control means comprises means for controlling the combustion fan rotational speed to the predetermined rotational speed at the beginning of the combustion operation, and wherein the air volume change amount calculating means is configured such that the combustion fan is started at the beginning of the combustion operation. Means for obtaining the detected air volume of the air volume sensor as the initial detection air volume when controlled at the predetermined rotational speed, and thereafter, between the actual rotational speed NX and the predetermined rotational speed NO of the combustion fan during burner combustion. And a means for obtaining the amount of detected combustion wind during combustion by multiplying the ratio NO / NX by the amount of air detected by the air flow sensor at the actual rotation speed NX.

In addition, the fan control means is characterized in that for controlling the combustion fan rotational speed to the predetermined rotational speed at the time of the pre-purge (Pre-Purge) or the burner burns out.

In order to achieve the above object, a second aspect of the present invention provides a combustion chamber accommodating a burner, an air supply port and an exhaust port connected to the combustion chamber, and a blower air for blowing combustion air to the burner. The installed combustion fan, the air flow sensor for detecting the air flow rate from the combustion fan to the burner, and the detection air flow detected by the air flow sensor during the burner combustion operation to match the set air flow rate for obtaining the required combustion amount of the burner. A combustion apparatus comprising a control means for controlling the rotational speed of the combustion fan, comprising: a first operational fisheries for obtaining a value of a detected air flow rate ratio of the airflow sensor to the combustion fan rotational speed during the combustion operation; Between the value H0 obtained by the first calculating means at the beginning of the combustion operation of the burner and the value H1 obtained by the first calculating means during the subsequent burning of the burner. Second calculating means for obtaining a change amount of? And operation stop means for stopping the combustion operation when the amount of change in the values of the ratios H0 and H1 obtained by the second calculation means exceeds a predetermined amount.

In the initial stage of the combustion operation of the burner, the ratio H0 is characterized in that it is a value of the ratio at the time of pre-purging or when the burner is fully developed.

In the first aspect of the present invention, when the clogging of the exhaust port occurs, and when it is progressing to a certain extent, the combustion operation proceeds for the detected air volume obtained by the air volume sensor at an arbitrary rotation speed of the combustion fan. If it does, it falls relatively large with respect to the initial detection wind volume of a combustion operation. Therefore, when the amount of change between the initial detection amount and the amount of detection during combustion increases in the predetermined rotational speed, and the amount of change exceeds the predetermined amount, clogging of the exhaust port proceeds to some extent, which may cause a problem in combustion operation. You can judge. In such a case, the situation where improper combustion operation is performed by stopping the combustion operation by the operation stop means is eliminated. When the exhaust port is in a normal state and clogging of the air supply port occurs, the amount of change between the initial detection wind amount and the combustion detection wind amount during combustion does not become very large and stays below the predetermined amount. Therefore, the combustion operation is continued without stopping at this time. In this case, the combustion operation is appropriately performed by controlling the rotation speed of the combustion fan so that the detected air volume obtained by the air volume sensor matches the set air volume.

In this case, the control by the fan control means for matching the detected air flow rate of the air flow sensor to the set air flow during the combustion operation is, for example, the relationship between the air flow rate and the rotation speed of the combustion fan when the load of the combustion fan is normal. Is stored as a reference data in advance, and the combustion fan is continuously controlled as the reference command speed based on the reference speed determined in response to the set air volume based on the reference data at the time of combustion operation. This is performed by correcting the rotation speed of the combustion fan in accordance with the deviation of the detected wind volume. In this case, in the initial stage of the combustion operation of the burner, the deviation obtained by the deviation calculation means corresponding to the predetermined set amount of wind which is the predetermined rotation speed of the combustion fan and the combustion during the burner By obtaining a difference from the deviation obtained by the deviation calculation means in correspondence with a predetermined set wind amount, the difference between the initial detected wind amount and the combustion wind amount during combustion is obtained as the change amount between those detected wind amounts. That is, for example, when the predetermined set amount of air is given to the fan control means at the beginning of the combustion operation, the fan control means first controls the rotational speed of the combustion fan to the predetermined rotational speed, and the deviation The initial deviation obtained by the calculation means is a deviation between the predetermined set wind amount and the initial detection amount. Similarly, if the predetermined set amount of air is given to the fan control means during combustion, the fan control means first controls the rotational speed of the combustion fan to the predetermined rotational speed, and at this time during combustion obtained by the deviation calculation means. The deviation is a deviation between the predetermined set wind amount and the combustion detection wind amount. Therefore, the difference in these deviations becomes the difference between the initial detection wind amount and the combustion detection wind amount, which corresponds to the amount of change between the two detection wind amounts. In this way, the deviation calculation means of the fan control means for performing control of matching the detected air flow rate of the air flow rate sensor with the set air flow rate is effectively utilized to obtain the amount of change (difference) between the initial detected air flow rate and the combustion wind amount during combustion.

The fan control means further includes means for controlling the rotational speed of the combustion fan to the predetermined rotational speed at the beginning of the combustion operation, and the air volume obtained by the reference data corresponding to the predetermined rotational speed during the control. Is provided to the deviation calculation means with the predetermined set wind volume, first, at the beginning of the combustion operation, the output is output from the deviation calculation means when the combustion fan is controlled at the predetermined rotation speed. Deviation is obtained as the initial deviation. Then, during subsequent combustion, the set wind amount for obtaining the required burn amount is given to the fan control means, and the fan control means controls the rotation speed of the combustion fan so that the detected wind amount of the air volume sensor matches the set wind amount. In this case, in general, the set wind amount for obtaining the required burn amount is different from the predetermined set wind amount, and therefore the combustion fan controlled by the fan control means when the set fan amount for obtaining the required burn amount is given to the fan control means. The number of revolutions (= reference revolution) is not limited to the predetermined revolution number, but the deviation between the set wind amount and the detected wind amount obtained by the deviation calculation means is substantially proportional to the rotation speed of the combustion fan ( See FIG. 5). By the way, when the deviation during combustion is obtained, the reference rotation is applied to the deviation output from the deviation calculation means when the combustion fan is controlled at the reference speed corresponding to the set wind speed for obtaining the required combustion amount by the fan control means. By multiplying the ratio NO / NX between the number Nx and the predetermined rotational speed NO, the combustion deflection can be estimated by proportional calculation. And the clogging of the said exhaust port is grasped | ascertained by comparing the difference between the combustion deviation and the initial deviation calculated | required in this way with the said predetermined amount. In order to calculate the deviation during combustion by calculation, the combustion fan may be rotated so that the set fan amount is always obtained so that the set fan amount corresponding to the required burn amount is obtained regardless of the predetermined set amount of air or the predetermined number of revolutions. It becomes possible to control.

In addition, in the first aspect of the present invention, the amount of change between the initial detected wind amount and the combustion middle wind amount can be obtained without using the deviation obtained by the deviation calculation means of the fan control means as described above. That is, the initial detection amount is obtained by the air volume sensor by controlling the rotation speed of the combustion fan to the predetermined rotation speed at the beginning of the combustion operation. In addition, with respect to the amount of the detected combustion wind, the actual amount of air of the combustion fan is almost proportional to the number of revolutions at any time during the burner combustion (see FIG. 5 above). Therefore, in order to multiply the detected air flow rate of the airflow sensor at a certain point during combustion by the ratio (NO / NX) of the actual rotation speed NX of the combustion fan at that time and the predetermined rotation speed NO, the proportional calculation is performed. At the predetermined rotational speed NO, the combustion detection wind amount is estimated. By comparing the amount of change between the detected combustion wind amount and the initial detection wind amount thus obtained with the predetermined amount, it becomes possible to grasp the clogging of the exhaust port as described above. In addition, in order to calculate the amount of combustion detection air during combustion as described above, the combustion fan is rotated so that the set amount of air corresponding to the required combustion amount is always obtained during burning of the burner regardless of the predetermined rotational speed for obtaining the amount of detection air during combustion. It becomes possible to control the number. In addition, the amount of detected airflow in the soft water can be obtained from the airflow sensor by controlling the rotational speed of the combustion fan at the predetermined rotational speed, for example, during combustion of the burner.

Moreover, when controlling the rotation speed of the said combustion fan to the said predetermined rotation speed at the beginning of the said combustion operation, it is preferable to carry out at the time of prepurge or burner completeness. In this way, after the burner commences in order to obtain the initial detection amount, proper air volume control of the combustion fan is performed by the fan control means, so that the initial detection amount can be obtained at the most suitable timing.

Next, according to the second aspect of the present invention, when the clogging of the exhaust port occurs, and it progresses to a certain extent, the value of the ratio of the detected air flow rate of the air flow sensor to the combustion fan rotation speed, that is, the combustion fan rotation speed and the air flow volume The inclination of the straight line showing the relationship of? Decreases relatively largely with respect to the detected wind volume at the beginning of the combustion operation as the combustion operation proceeds. Therefore, the amount of change between the value of the ratio H0 at the beginning of the combustion operation and the value of the ratio H1 during the combustion of the burner thereafter increases, and when the amount of change exceeds the predetermined amount, the exhaust port is blocked. It can be judged that this progresses to some extent and there is a risk of causing trouble to the combustion operation. In such a case, the situation of improper combustion operation is eliminated by stopping the combustion operation by the operation stop means. In such a case, since the values H0 and H1 of the ratio do not depend on the rotation speed of the combustion fan, the combustion fan rotation speed may be arbitrarily obtained when the values H0 and H1 are obtained. In addition, in the case where clogging of the air supply portion occurs when the exhaust port is in a normal state, the value of the ratio of the detected wind volume to the rotational speed does not change very much at the beginning of combustion operation and during combustion. The amount of change stays below the said amount. Therefore, the combustion operation is continued without stopping at this time. In this case, the combustion operation is appropriately performed by controlling the rotation speed of the combustion fan so that the detected air volume obtained by the air volume sensor matches the set air volume.

In addition, at the beginning of the combustion operation of the burner, the ratio value H0 is, for example, a value at the time of pre-purging or when the burner is fully burned, so that the above-mentioned value is adjusted at an appropriate timing as in the first embodiment. The value H0 of the ratio is obtained.

An example of the first aspect of the present invention will be described with reference to FIGS. 1, 2, and 5. FIG. 1 is a block diagram of the combustion system of this embodiment, and FIG. 2 is a block diagram of the main part of the device of FIG.

With reference to FIG. 1, the combustion apparatus of this embodiment is a hot water heater, 1 is a hot water heater main body which has the heat exchanger 2 and the burner 3 which heats it, 4 is the water flow pipe piped through the heat exchanger 2 , 5 is a flow rate sensor for detecting the flow rate of water flowing through the water pipe 4 on the upstream side of the heat exchanger 2, 6 is detecting the tapping temperature of the water flowing through the water pipe 4 on the downstream side of the heat exchanger 2. Temperature sensor, 7 is a gas supply pipe for supplying gas to the burner (3), 8, 9 is a solenoid valve and gas proportional valve sequentially opened upstream of the gas supply pipe (7), 10 is the burner (3) A combustion fan blowing air for combustion in the air, 11 is a fan motor for driving the combustion fan 10, 12 is a rotation speed sensor constituted by a hall element for detecting the rotation speed of the combustion fan 10, and 13 is a combustion fan. Air flow sensor for detecting the amount of water to the burner (3) in (10), 14 is an operation unit for setting the tapping temperature, etc., the user A controller for controlling the fan motor 11, the solenoid valve 8, the gas proportional valve 9 and the like according to the set temperature of the hot water set by the cultivator 14 or the detection signals of the respective sensors 5, 6, 12 and 13 16 is an igniter for igniting the burner 3, and 17 is a flame rod for detecting a combustion state such as the presence or absence of misfire of the burner 3.

The burner 3 is accommodated in the combustion chamber 18 formed in the water heater main body 1 below the heat exchanger 2, and the combustion chamber 18 has an exhaust port 19 provided above the water heater main body 1. The air supply port 20 provided in the lower part is in communication. The combustion fan 10 is provided on the air supply port 20 side, and the air flow sensor 13 is disposed in the air passage 21 extending from the air supply port 20 to the combustion chamber 18.

The upstream side of the water pipe 4 is connected to a water pipe (not shown), and the downstream side is connected to a hot water supply opening and closing device (not shown) such as a kitchen or a bathroom. The air flow rate sensor 13 is, for example, a hot air flow rate sensor. In addition to the hot wire type, the airflow sensor includes thermal type, Karman overeating, and Ben type.

Referring to FIG. 2, the controller 15 is composed of an electronic circuit including a microcomputer and the like. As a functional configuration, the controller 15 is provided by a set temperature imparted by the operation unit 14 and an inlet temperature sensor (not shown). Required combustion amount for obtaining the required combustion amount of the burner 3 required to match the tapping temperature to the set temperature at the detected water temperature, the tapping temperature detected by the temperature sensor 6, and the flow rate detected by the flow sensor 5 An air volume setting unit 23 for setting the air volume (supply amount of combustion air) from the combustion fan 10 to the burner 3 corresponding to the required amount of combustion determined by the arithmetic unit 22; A fan control unit 24 for controlling the rotation speed of the combustion fan 10 with the fan motor 11 in accordance with the detected air volume detected by the sensor 13 and the set air volume set by the air volume setting unit 23, and the rotation Gas proportional bell according to the rotation speed of the combustion fan 10 detected by the water sensor 12 (9) the valve control unit 25 for controlling the gas supply amount to the burner 3 by controlling the opening degree, and the detected wind amount (initial detection wind amount) of the air volume sensor 13 at the beginning of the combustion operation (hot water supply operation). And the air volume change calculation unit (air volume change amount detecting means) 26, which obtains the difference between the detected air volume (the detected air volume during combustion) of the air volume sensor 13 as the amount of change between the detected air quantities during the combustion of the burner 3 and the air volume. The fan control unit 24 stops the combustion fan 10 with the burner 3 in accordance with the difference between the initial detection wind amount determined by the change amount calculation unit 26 and the combustion detection wind amount. The stop command part 27 which interrupts gas supply is provided.

Here, in accordance with the configuration of the first aspect of the present invention, the fan control unit 24 merges the fan motor 11 and the rotation speed sensor 12 to form the fan control means 28, and the stop command unit ( 27 combines the solenoid valve 8 and the fan control unit 24 to constitute the operation stop means 27a. The fan control unit 24 includes a deviation calculation unit (deviation calculation unit) 29 for obtaining a deviation between the set air volume and the detected air volume of the air volume sensor 13, and the air volume and the rotation speed of the combustion fan 10 at the normal time. A reference speed setting for obtaining a reference speed of the combustion fan 10 corresponding to the set rotation speed on the basis of the storage unit (memory means) 30 which previously stored and held the reference data indicating the relationship with the reference data; Section (reference rotation speed setting means) 31 and a correction section 32 for correcting the rotation speed of the combustion fan 10 in accordance with the deviation obtained by the deviation calculation unit 29. The reference data stored in the storage unit 30 is data shown by the solid line a in FIG. 5.

In addition, the air volume change amount calculating section 26 is an initial deviation extracting section 33 for extracting the deviation (initial deviation) obtained by the deviation calculating section 29 at the beginning of the combustion operation, and a deviation during combustion of the burner 3. The combustion difference deviation extracting unit 34, which extracts the deviation obtained by the calculation unit 29 to obtain the combustion deviation, and the difference between the initial deviation and the combustion deviation, is obtained as the difference between the initial detection wind amount and the detection wind amount during combustion. The subtraction part 35 is provided.

When the water flow of the water pipe 4 starts, the controller 15 detects this by the flow rate sensor 5, and the fan control unit 24 uses the fan control unit 24 as a combustion motor to detect the water flow. While rotating (10), 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 by the igniter 16, Therefore, the combustion operation (hot water supply operation) of the burner 3 is started. At this time, the fan control unit 24 rotates the combustion fan 10 at a predetermined rotation speed (about 50% of the maximum rotation speed) for a predetermined time prior to the ignition of the burner 3, and performs prepurging. Subsequently, the burner 3 is fully developed.

When the water supply pipe 4 is stopped, the controller 15 closes the solenoid valve 8 to shut off the gas supply to the burner 3 and at the same time, the fan control unit 24 causes the combustion fan. (10) is stopped and the hot water supply operation is stopped. The end operation of the hot water supply operation is similarly performed when a misfire of the burner 3 is detected by the flame rod 17 during the hot water operation.

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

When the hot water supply operation is started as described above, the controller 15 rotates the combustion fan 10 at the predetermined rotation speed NO shown in FIG. 5 by the fan control unit 24, and in this state. The prepurge and burner 3 are fully developed. At this time, the air volume setting unit 23 determines the set air volume Fa0 corresponding to the predetermined rotational speed NO in the reference data indicated by the solid line a in FIG. 5 and the deviation calculation unit 29 of the fan control unit 24. ), And the deviation calculation unit 29 calculates a deviation between the set wind amount Fa0 and the detected wind amount obtained by the wind amount sensor 13 at this time. In such a case, if clogging of the air supply port 20 or the exhaust port 19 occurs, the relationship between the rotation speed of the combustion fan 10 and the air volume is the same as that shown by the solid line b in FIG. In this case, the detected air volume is Fb0 (Fa0), and the deviation obtained by the deviation calculator 29 is (Fa0-Fb0).

The initial deviation extracting unit 33 of the air volume change calculating unit 26 performs the deviation Fa0-Fb0 obtained by the deviation calculating unit 29 at the time of prepumping at the beginning of the hot water supply operation (combustion operation). The data is extracted as an initial deviation, and stored in the memory not shown.

Next, when the burner 3 is ignited and the combustion operation is started, the controller 15 controls the tapping temperature detected by the temperature sensor 6 by the required combustion amount calculation unit 22 by the operation unit 14. The required burned amount of the burner 3 necessary to match the set set temperature is determined at every time based on the intake temperature, the tapping temperature, and the detection data of the flow rate. In addition, the air volume setting unit 23 of the controller 15 sets the air volume from the combustion fan 10 to the burner 93 corresponding to the required combustion amount calculated by the required combustion amount calculation unit 22 according to a predetermined data table or the like, The set air volume is given to the fan control unit 24.

At this time, the fan control unit 24 is given on the basis of the reference data (data indicated by the solid line a in FIG. 5) stored in the storage unit 30 by the reference rotation speed setting unit 31. The reference speed corresponding to the set air volume is set as the reference command speed of the combustion fan 10. Specifically, with reference to FIG. 5, when the given set air volume is a fax, the reference rotation speed Nx is set as the reference command rotation speed. The fan control unit 24 basically monitors the actual rotational speed of the combustion fan 10 by the rotational speed sensor 12, and the rotational speed of the combustion fan 10 so that it becomes the reference rotational speed Nx. Feedback control.

In this case, when the load of the combustion fan 10 is normal without clogging the exhaust port 19 or the air supply port 20, the above-described control is performed, so that the amount of detected air flow obtained by the airflow sensor 13, namely The actual air volume to the burner 3 becomes the set air volume Fax. By the way, when the blockage of the exhaust port 19 and the air supply port 20 occurs, and the relationship between the rotation speed of the combustion fan 10 and the air volume becomes a relationship as shown by the solid line b of FIG. 5, for example, Even if the rotation speed of the combustion fan 10 is controlled by the reference rotation speed Nx, the detected air volume obtained by the air volume sensor 13 then becomes Fbx (Fax) and does not match the set air volume Fax. In such a case, the fan control unit 24 supplies the correction unit 32 according to the deviation (Fax-Fbx) between the set wind amount (Fax) and the detected wind amount (Fbx) determined by the deviation calculation unit (29). The rotational speed of the combustion fan 10 is corrected on the basis of the reference rotational speed Nx, and thus the rotational speed Nxb (see Fig. 5) is finally made so that the detected airflow quantity is consistent with the set wind speed. The rotation speed of the combustion fan 10 is corrected and controlled.

On the other hand, the valve control unit 25 of the controller 15, in parallel with the combustion fan 10 is controlled as described above, controls the opening degree of the gas proportional valve 9 to control the gas supply amount to the burner 3 do. In this case, basically, the valve control unit 25 controls the opening degree of the gas proportional valve 9 in accordance with the actual rotation speed of the combustion fan 10 detected by the rotation speed sensor 12. Therefore, when the load of the combustion fan 10 is normal without clogging the exhaust port 19, the rotation speed of the combustion fan 10 and the actual air volume correspond to each other, and thus the combustion fan 10 as described above. By controlling the opening degree of the gas proportional valve 9 in accordance with the rotational speed of the gas, the amount of gas supplied to the burner 3 corresponds to the amount of air to the burner 3 controlled by the set air volume, and the burner 3 Burns with the required combustion amount.

However, for example, when clogging of the exhaust port 19 or the air supply port 20 occurs, the rotation speed of the combustion fan 10 is controlled to match the detected air flow rate and the set air flow rate as described above, so that the burner 3 Even if the amount of air flow to () is the same, the rotation speed of the combustion fan 10 is increased or decreased. Therefore, simply by controlling the opening degree of the gas proportional valve 9 according to the rotational speed of the combustion fan 10, even if the air volume to the burner 3 is the same, the gas proportional valve according to the rotational speed of the combustion fan 10 The opening degree of (9) changes, and the gas supply amount to the burner 3 changes.

Therefore, the valve control unit 27 of the controller 14, when the detected air volume of the air volume sensor 13 is smaller than the set air volume in order to compensate for the correction of the rotation speed of the combustion fan 10, the combustion fan 10 Since the rotation speed of the fan is increased by the fan control unit 24, the opening degree of the gas proportional valve 9 is reduced from the opening degree according to the rotation speed of the combustion fan 10, and in the opposite case, the gas proportional valve 9 ) Increases the opening degree according to the rotational speed of the combustion fan 10. As a result, the gas supply amount to the burner 3 corresponds to the actual amount of air (detected air amount) to the burner 3, and the burner 3 burns smoothly at the required combustion amount.

During such a combustion operation, the deviation extracting unit 34 during combustion of the air volume change calculating unit 26 is a reference in which the combustion fan 10, by the fan control unit 24, corresponds to the set air volume as described above. When the rotational speed is controlled as the reference rotational speed and the reference rotational speed, then, during combustion, the deviation extracting unit 34 extracts a deviation between the set amount of air determined by the deviation calculating unit 29 and the detected amount of air, and the deviation. The deviation during combustion is obtained from the following description.

That is, with reference to FIG. 5, at any point in the combustion operation described above, the relationship between the rotation speed of the combustion fan 10 and the air volume is blocked by the exhaust port 19, for example, by the virtual line of FIG. In this state, if, for example, the set wind amount Fax is given to the fan control unit 24, the fan control unit 24 first determines the rotation speed of the combustion fan 10. The reference speed Nx corresponding to the set air volume Fax is controlled. At this time, the detected air flow rate of the air flow sensor 13 is Fcx, and the deviation obtained by the deviation calculation unit 29 becomes (Fax-Fcx). This deviation (Fax-Fcx) is extracted by the deviation extraction unit 34 during combustion. Then, the deviation extracting part 34 during the combustion, at the present time, the rotation speed (= reference speed Nx) of the combustion fan 10 detected by the rotation speed sensor 12, and performs the combustion operation as described above. When starting, the ratio (NO / NX) to the predetermined rotational speed NO of the combustion fan 10 when the initial deviation Fa0-Fb0 is extracted by the initial deviation calculation unit 33 is obtained. The value NO / NX is multiplied by the deviation (Fax-Fcx), and the value obtained by the multiplication is obtained as the in-combustion deviation. The deviation in combustion thus obtained is as shown in Fig. 5 clearly, in the present state (state of the imaginary line c in Fig. 5) when the initial deviation (Fa0-Fb0) is extracted. In the set air volume Fa0, when the rotation speed of the combustion fan 10 is controlled to the predetermined rotation speed NO, the deviation obtained by the deviation calculation unit 29 is estimated by proportional calculation. Therefore, the combustion deflection is in the state of the imaginary line c of FIG. 5, and the detected air flow rate of the air flow sensor 13 when the rotation speed of the combustion fan 10 is set to the predetermined rotation speed NO is set to Fc0. (Fa0-Fc0).

When the deviation Fa0-Fc0 during combustion is obtained as described above, the air volume change amount calculation unit 26 causes the initial deviation Fa0-Fb0 to be obtained by the initial deviation calculation unit 33 as described above. The subtraction unit 35 subtracts from -Fc0). The value obtained by this subtraction is (Fb0-Fc0), and the detected wind amount Fb0 obtained by the airflow sensor 13 when the rotation speed of the combustion fan 10 at the start of combustion operation is set to the predetermined rotation speed NO. ) And the detected wind amount Fc0 obtained by the air volume sensor 13 when the rotation speed of the combustion fan 10 is set to the predetermined rotation speed NO during the combustion of the burner 3.

Therefore, in the combustion operation, when the exhaust port 19 is clogged, as described above, the amount of air flows at an inclination of a straight line showing the relationship between the rotation speed of the combustion fan 10 and the air flow rate, or at an arbitrary rotation speed, When the combustion operation of the burner 3 proceeds, the prepurge in which the rotational speed and the air volume of the combustion fan 10 are relatively large decreases as compared with the initial combustion operation, and the initial deviation Fa0-Fb0 is obtained. The relationship as shown by the solid line b in FIG. 5 in the city becomes the same as that shown by the imaginary line c in FIG. 5 during combustion.

Therefore, in such a case, the difference between the detected wind amount Fb0 and the detected wind amount Fc0 obtained by the subtraction unit 35 becomes relatively large.

On the other hand, when there is no blockage of the exhaust port 19, or the degree of blockage is small, and the blockage of the air supply port 20 occurs, the relationship between the rotational speed of the combustion fan 10 and the air volume is not much at the beginning of the combustion operation. The difference between the detected wind amount Fb0 and the detected wind amount Fc0 obtained by the subtraction unit 35 is relatively small. This also applies to the case where the exhaust port 19 and the air supply port 20 are normal without clogging.

Therefore, the stop command unit 27 of the controller 15 compares the difference Fb0-Fc0 between the detected wind amount Fb0 and the detected wind amount Fb0 obtained by the subtraction unit 35 with a predetermined value. When the difference Fb0-Fc0 exceeds the predetermined value, the solenoid valve 8 is closed to shut off the gas supply to the burner 3, and the fan control unit 24 opens the combustion fan 10. The operation of the water heater is stopped. Accordingly, the hot water heater automatically stops the combustion operation in a state in which exhaust leakage or incomplete combustion may occur, where clogging of the exhaust port 19 progresses to a certain degree.

When the air supply port 20 is clogged without clogging the exhaust port 19, the difference Fb0-Fc0 between the detected air volume Fb0 and the detected air volume Fc0 does not exceed the predetermined value, and thus the water heater The combustion operation as described above continues.

Next, another example of the first aspect of the present invention will be described with reference to FIG. 3 and FIG. 3 is a block diagram of main parts of the apparatus of this embodiment. In addition, the apparatus of this embodiment is a hot water heater having the same system configuration as the hot water heater of FIG. 1, and the same reference numerals are given to those having the same configuration as the hot water heater of FIG.

Referring to Fig. 3, in the hot water heater of the present embodiment, the controller 15 shown in Fig. 1 is required combustion amount calculation unit 22, air volume setting unit 23, fan control unit ( 24, a valve control unit 25, a flow rate change amount calculating section (wind amount change amount calculating means) 26, and a stop command section 27 are provided. Therefore, corresponding to the configuration of the first aspect of the present invention, the fan control unit 24 constitutes the fan control means 28 together with the fan motor 11 and the rotation speed sensor 12, and the stop command unit 27. In combination with the solenoid valve 8 and the fan control unit 24, the operation stop means 27a is constituted.

In this case, the air volume change amount calculation unit 26 includes an initial detection wind amount extracting unit 3 and an combustion detection wind amount extracting unit 37 for extracting the initial detection wind amount and the combustion detection wind amount respectively from the air volume sensor 13; The subtraction part 38 which calculates the difference of the initial stage detection wind quantity and the detection wind quantity during combustion is provided. In addition, except for the air volume change detection unit 26, the other configuration and operation is exactly the same as in the above embodiment.

Next, the operation of the hot water heater of the present embodiment will be mainly described as an operation different from that of the above embodiment.

In the hot water heater of the present embodiment, at the start of the hot water heater operation (combustion operation), the combustion fan 10 is similar to the above-described embodiment by the fan control unit 24 at the time of the preliminary prepurification and the burnout to the burner 3. ) Is driven at a predetermined rotation speed NO by the fan motor 11. At this time, the detected air volume of the air volume sensor 13 is extracted by the initial detection air volume extracting unit 36 as the initial detection air volume and stored in a memory (not shown). At the time of extracting the initial detection wind amount, it is said that the relationship between the rotational speed of the combustion fan 10 and the air volume is shown by the solid line b of FIG. 5, and the initial detection wind amount extracted is Fb0.

Next, when combustion of the burner 3 is started, the number of rotations of the combustion fan 10 is controlled by the fan control unit 24 so that the set wind amount and the detected wind amount of the air volume sensor 13 coincide with each other. At the same time, the opening degree of the gas proportionality valve 9 is controlled by the valve control part 25 so that the gas of the quantity suitable for the air volume may be supplied to the burner 3, and the burner 3 will be set to the required combustion amount. Burn out.

During the combustion of the burner 3, the detected air volume of the air volume sensor 13 is sequentially extracted by the detection air volume extracting unit 37 during combustion. In such a case, the number of revolutions of the combustion fan 10 at the time of extracting the detection air volume may be limited to the predetermined number of revolutions NO of the combustion fan 10 when the initial detection wind amount is extracted. none. Therefore, the combustion detection wind amount extraction part 37 multiplies the detection wind amount which extracted the ratio of the said predetermined rotation speed NO with respect to the rotation speed of the combustion fan detected by the rotation speed sensor 12 at the time of extracting a detection wind volume. By doing so, the amount of detected wind of the air volume sensor 13 is estimated as the amount of detected wind during combustion at the predetermined rotational speed NO.

When the rotation speed of the combustion fan 10 detected by (12) is Nx and the detection air volume detected by the air flow sensor 13 is Fcx, the detection air volume extracting unit 37 during combustion causes the The amount of detected air flow of the air volume sensor 13 at the predetermined rotation speed NO is multiplied by the value of the ratio NO / NX of the ratio of the predetermined rotation speed NO to the actual rotation speed Nx to the detection air flow rate Fcx. (Fc0) is obtained as the amount of detected wind during combustion.

The thus detected combustion wind amount Fc0 is given to the subtractor 38 together with the initial detection wind amount Fb0, and the difference Fb0-FC0 is determined by the subtractor 38.

When the exhaust port 19 is clogged, the relationship between the rotation speed of the combustion fan 10 and the air volume at the time when the burner 3 is in combustion is shown by the solid line b in FIG. In the same relationship as shown by the same drawing virtual line (c). Therefore, as in the above-described embodiment, the difference Fb0-FC0 of the detected wind amount determined by the subtracting section 38 becomes relatively large.

Therefore, similarly to the above embodiment, the stop commanding unit 27 closes the solenoid valve 8 at the same time when the difference Fb0-Fc0 of the calculated air flow rate determined by the subtracting unit 38 exceeds a predetermined value. The fan control unit 24 stops the operation of the combustion fan 10, thereby stopping the combustion operation.

In the case of the blockage of the air supply port 20, or in the normal case where the exhaust port 19 and the air supply port 20 are not blocked, the combustion operation continues as in the above-described embodiment.

In each embodiment of the first aspect of the present invention described above, the difference between the initial detected wind amount and the detected combustion wind amount is determined, but the ratio thereof is obtained as the amount of change between the initial detected wind amount and the detected combustion wind amount and compared with a predetermined value. As a result, the clogging of the exhaust port 19 may be recognized to stop the combustion operation.

In addition, in each Example of 1st aspect, although the initial detection amount at the time of prepurge was acquired, you may make it possible to obtain the initial detection wind amount at the time of burner 3 perfection. Furthermore, the initial detection wind amount may be obtained initially after the combustion of the burner 3 is started, and in this case, the initial detection wind amount may be estimated by calculation similarly to the detection wind amount during combustion.

Moreover, in each Example of 1st aspect, although the water heater was demonstrated as an example of a combustion apparatus, it cannot be overemphasized that the 1st aspect of this invention can be applied also to other combustion apparatuses, such as a fan heater.

Moreover, in the said other Example of 1st aspect, although the rotation speed correction of the combustion fan 10 for making a set wind volume and a detected wind volume match, it is made to perform according to the deviation of a set wind volume and a detected wind volume, The rotation speed of the combustion fan 10 may be corrected in accordance with the ratio of the air volume.

Next, an example of the second aspect of the present invention will be described with reference to FIG. 4 and FIG. 4 is a block diagram of essential parts of the apparatus of this embodiment. In addition, the apparatus of this embodiment is a hot water heater which has the same system structure as the water heater of FIG. 1, and it demonstrates below and attaches | subjects the same code | symbol, and abbreviate | omits detailed description about the thing of the same structure as the water heater of FIG.

Referring to FIG. 4, in the hot water heater of the present embodiment, the controller 15 shown in FIG. 1 has the necessary combustion amount calculating section 22, the air volume setting section 23, and the like in the first embodiment. The fan control part 24, the valve control part 25, and the stop command part 27 are provided. In addition, corresponding to the configuration of the second aspect of the present invention, the fan control unit 24 constitutes the fan control means 28 together with the fan motor 11 and the rotation speed sensor 12, and the stop command unit 27. Constitutes an operation stop means 27a together with the solenoid valve 8 and the fan control unit 24.

The controller 14 has a configuration different from that of the embodiment of the first aspect, in which the rotation speed of the combustion fan 10 detected by the rotation speed sensor 12 during the hot water supply operation and the detected air volume of the air volume sensor 13 are different. The value of the ratio calculated by the first calculation unit 39 at the beginning of the hot water supply operation, for example, at the time of prepurge, and the burner 3 thereafter The second calculation part 40 which obtains the difference (variation amount) with the value of the ratio calculated | required by the 1st operation part 39 sequentially during combustion, and gives it to the stop command part 27 is provided.

The configuration operation except for the first calculation section 39 and the second calculation section 40 is the same as that of the embodiment of the first aspect.

Next, the operation of the hot water heater of the present embodiment will be mainly explained by the operation different from that of the embodiment of the first aspect described above.

As described above, when the hot water supply operation is started, the first calculation unit 39 determines the value of the ratio between the rotation speed of the combustion fan 10 detected by the rotation speed sensor 12 and the detected wind volume of the air volume sensor 13. Find every time until the end of operation. First, at the time of prepurging at the start of the hot water supply operation, the second calculating section 40 stores the value of the ratio between the rotational speed obtained by the first calculating section 39 and the detected air volume in a memory (not shown). Specifically, referring to FIG. 5, at the beginning of the hot water supply operation, if the relationship between the rotational speed of the combustion fan 10 and the air flow rate is shown by the solid line b in the same drawing, the value of the ratio is It is the value (F0 / N0 of the ratio of the detected wind amount F0 to the rotation speed N0 (= predetermined rotation speed) of the combustion fan 10 at the time of prepurification (Hereinafter, this will be described with reference numeral H0)). . The value H0 of this ratio represents the inclination of the solid line b.

Next, when combustion of the burner 3 is performed as mentioned above, the 2nd calculating part 40 will have the value of the ratio obtained by the 1st calculating part 39 every time, and the value of the ratio obtained at the said prepurge (H0). Is obtained, and this is given to the stop command unit 27.

Specifically, as of now, if the relationship between the rotational speed of the combustion fan 10 and the air volume is in the relationship shown by the virtual line c in FIG. 5, if the rotational speed of the combustion fan 10 is set to Nx, it will be detected. The air flow rate is Fcx, and the difference (H0-H1) between the value of the ratio (Fcx / Nx, hereinafter described with reference numeral H1) and the value H0 of the ratio is supplied to the second calculating section 40. Obtained by

When the exhaust port 19 is clogged, when combustion of the burner 3 progresses, the relationship between the rotation speed of the combustion fan 10 and the air volume is shown by the solid line b of FIG. Is the relationship shown by the imaginary line (c) of the same drawing, and the inclination of the straight line which shows the relationship between the rotation speed of the combustion fan 10 and the air volume, ie, the ratio of the air volume to the rotation speed of the combustion fan 10 The value of decreases relatively large. Therefore, in the case of clogging the exhaust port 19, the difference H0-H1 of the ratio value determined by the second calculating section 40 becomes relatively large when combustion of the burner 3 proceeds.

Therefore, the stop command unit 27 compares the difference (H0-H1) of the ratio value with a predetermined value, and stops the combustion operation similarly to the embodiment of the first aspect described above when the predetermined value is exceeded. At this time, the combustion operation may be stopped and an abnormal state may be reported. This is the same also in the Example of 1st aspect mentioned above. In addition, when there is no blockage of the exhaust port 19 or the degree of the blockage is small, even if a blockage of the air supply port 20 occurs, the difference (H0-H1) of the ratio value remains below the predetermined value. In this case, combustion operation (hot water supply operation) is performed as described in the above embodiment of the first aspect. That is, by the fan control unit 24, the rotation speed of the combustion fan 10 is controlled so that the set air flow rate and the detected air flow rate of the air flow rate sensor 13 are matched, and at the same time, a gas of an appropriate amount is supplied to the burner 3. The opening degree of the gas proportionality valve 8 is controlled by the valve control part 25, and the burner 3 burns by the required combustion amount.

In the present embodiment, the difference between the value H0 at the beginning of the operation and the value H1 during combustion is calculated. However, the ratio of the values H0 and H1 of these ratios is obtained. By comparing it to a predetermined value, it may be possible to catch the clogging of the exhaust port 19 and stop the combustion operation.

In addition, in the present Example, although the said value H0 was made into the value of the ratio at the time of preposition, the value of the ratio at the time of burnout of the burner 3 may be used, and the combustion of the burner 3 is The value of the ratio may be used at any time after the start.

In the present embodiment, the hot water heater is described as a combustion device. However, the second aspect of the present invention can be applied to other combustion devices such as a fan heater.

In addition, in the present embodiment, the rotation speed of the combustion fan 10 is made to be corrected according to the deviation between the set wind speed and the detected wind volume in order to match the set wind volume and the detected wind volume. The rotation speed of the combustion fan 10 may be corrected.

As is clear from the above description, according to the first aspect of the present invention, the initial detection wind amount obtained by the air flow sensor corresponding to the predetermined rotational speed of the combustion fan at the beginning of the combustion operation, and then the predetermined amount of the combustion fan during combustion. In response to the rotational speed, when the amount of change between the detected wind speeds obtained by the wind speed sensor exceeds a predetermined amount, the soft stop operation is stopped by an operation stop means, so that exhaust leakage or incomplete combustion may occur. In the case of clogging, it is possible to stop the combustion operation automatically, and when there is no blockage of the exhaust port or the degree of blockage is small, the burner of the burner, even if it is normal as well as a degree of blockage of the air supply, The rotation speed of the combustion fan is controlled by the fan control unit so that the detected air flow rate of the air flow sensor matches the set air flow rate corresponding to the required combustion amount. By controlling, the combustion operation of the burner can be performed smoothly. Therefore, the blockage of the exhaust port can be distinguished from the blockage of the air supply and the like, and the correct operation can be performed accordingly, and the combustion device excellent in safety and usability. Can be provided.

Further, at the beginning of the combustion operation, the initial deviation is obtained at the deviation calculation unit of the fan control means as the rotation speed and the set wind amount of the combustion fan at the predetermined rotation speed and the predetermined set wind amount, and thereafter, during the burning of the burner, From the deviation obtained by the deviation calculation unit in the set wind amount, the combustion deflection corresponding to the predetermined rotation speed and the predetermined set wind amount is estimated by calculation, and the difference between the initial deviation and the combustion deflection is calculated from the initial detection wind amount. By determining the amount of change between the detected wind speeds during combustion, the burner during combustion always corresponds to the required combustion amount, regardless of the processing for obtaining the detected combustion wind amount, as long as the clogging of the exhaust port does not proceed to some extent. It is possible to control the set airflow and the detected airflow to match, and accordingly, it is possible to perform a precise and smooth combustion operation.

In addition, at the beginning of the combustion operation, the rotation speed of the combustion fan is controlled to a predetermined rotation speed, an initial detection air volume is obtained by the airflow sensor, and thereafter, the combustion fan controlled by the fan control means during combustion of the burner. The above operation can be performed in a simple configuration by calculating the amount of detected combustion air at the predetermined rotational speed by calculation from the detected airflow volume of the airflow sensor at any rotational speed of the burner. As long as clogging of the exhaust port is not progressed to some extent, irrespective of the processing for obtaining the detected air flow rate during combustion, the set air flow rate corresponding to the required combustion amount can be controlled to match the detected air flow amount, and thus it is accurate. Smooth combustion operation can be performed.

Further, in the case of pre-purging or perfecting, the combustion fan is controlled at a predetermined rotation speed to obtain the initial deviation or the initial detection wind volume, so that the normal combustion operation is continued and the initial deviation or initial detection is performed. The air volume can be obtained easily at an accurate timing.

According to the second aspect of the present invention, the value of the ratio of the detected air flow rate of the air flow sensor to the rotational speed of the combustion fan obtained by the first calculation unit at the beginning of the combustion operation is determined by the first calculation unit during combustion. By obtaining the change amount between the values of the detected air flow rate ratio of the air flow sensor with respect to the rotation speed of the combustion fan obtained, and stopping the combustion operation by the operation stop means when the change amount exceeds the predetermined amount, In the case of clogging of the exhaust port which may cause exhaust leakage or incomplete combustion, the combustion operation can be stopped automatically, and if the clogging of the exhaust port is small or the degree of the blockage is small, of course, Even if there is a blockage of the air supply, the fan control unit rotates the combustion fan so that the detected air volume of the air volume sensor matches the set air volume corresponding to the burned amount of the burner. By controlling the whole water, the burner operation can be smoothly operated. Therefore, the blockage of the exhaust port can be distinguished from the blockage of the air supply and the like, and the correct operation can be performed accordingly. This excellent combustion device can be provided. Since the rotation speed of the combustion fan may be any value, the ratio value can be obtained very simply, and the burner is always set to correspond to the required combustion amount, unless the clogging of the exhaust port is advanced to some extent during the combustion of the burner. The air volume and the detected air volume can be controlled to match each other, so that an accurate and smooth combustion operation can be performed.

In addition, since the value of the ratio is obtained at the time of prepurgement or perfection at the beginning of the combustion operation, the value of the ratio can be easily obtained at a precise timing at the beginning of the combustion operation.

Claims (7)

A combustion chamber accommodating a burner, an air supply port and an exhaust port connected to the combustion chamber in succession, a combustion fan provided on the air supply side to blow combustion air into the burner, and an air volume for detecting the air volume from the combustion fan to the burner Combustion comprising a sensor and fan control means for controlling the rotational speed of the combustion fan so as to match the detected airflow amount detected by the airflow sensor during the combustion operation of the burner with a set airflow amount for obtaining the required combustion amount of the burner. An apparatus, comprising: an initial detection wind amount obtained by the air flow sensor in response to a predetermined rotation speed of the combustion fan at the beginning of a combustion operation of the burner, and corresponding to a predetermined rotation speed of the combustion fan during subsequent combustion of the burner Airflow change amount calculating means for obtaining a change amount between the combustion wind detection amounts obtained by the airflow sensor; And an operation stop means for stopping the combustion operation when the amount of change between the initial detected wind amount and the amount of detected wind during combustion exceeded a predetermined amount obtained by the air volume change amount calculating means. 2. The fan control means according to claim 1, wherein the fan control means comprises: memory means for storing in advance the relationship between the air volume of the combustion fan and the rotation speed when the load of the combustion fan is normal as reference data, and the reference data during the combustion operation of the burner. A reference speed setting means for obtaining a reference speed of the combustion fan corresponding to the set wind speed on the basis of the reference; By controlling the rotation speed of the combustion fan as the reference rotational speed as the reference rotational speed, the combustion fan is corrected so that the detected wind amount matches the set airflow amount by correcting the rotational speed of the combustion fan according to the deviation between the set airflow and the detected airflow. And the air volume change amount calculating means sets a predetermined speed at which the reference speed becomes the predetermined speed at the beginning of the combustion operation of the burner. The difference between the initial deviation obtained by the deviation calculation means in correspondence with the air volume and the deviation during combustion obtained by the deviation calculation means in response to the predetermined set air volume during combustion of the burner is the initial detection wind amount and in-burn detection. A combustion device characterized in that it is obtained as a change amount between air flows. 3. The fan control means according to claim 2, wherein the fan control means includes means for controlling the rotational speed of the combustion fan to the predetermined rotational speed at the beginning of the combustion operation, and in response to the reference data in response to the predetermined rotational speed. Means for imparting the amount of air obtained by the predetermined amount of air to the deviation calculating means, wherein the amount of air changing amount calculating means includes the deviation calculation when the combustion fan is controlled at the predetermined rotational speed at the beginning of the soft water operation. Means for obtaining the deviation output from the means as the initial deviation, and the deviation when the combustion fan is controlled to the reference rotational speed corresponding to the set wind speed for obtaining the required combustion amount by the fan control means during subsequent burner combustion. The combustion during the combustion by multiplying the deviation (N0 / Nx) of the ratio between the reference rotational speed (Nx) and the predetermined rotational speed (N0) by the deviation output from the calculation means And a means for calculating the deviation. 2. The fan control means according to claim 1, wherein the fan control means comprises means for controlling the rotational speed of the combustion fan to the predetermined rotational speed at the beginning of the combustion operation, and the air volume change amount calculating means at the beginning of the combustion operation. Means for obtaining the detected air volume of the air volume sensor as the initial detection air volume when the combustion fan is controlled at the predetermined rotation speed, the actual rotation speed Nx of the combustion fan during combustion of the burner thereafter, and the predetermined air flow rate; And a means for obtaining the amount of detected combustion air during the combustion by multiplying the value N0 / Nx of the ratio with the speed N0 by the detected air volume of the air volume sensor at the actual speed Nx. . 5. The combustion apparatus according to claim 3 or 4, wherein the fan control means controls the rotation speed of the combustion fan to the predetermined rotation speed when pre-purging or when the burner is fully burned out. A combustion chamber accommodating a burner, an air supply port and an exhaust port connected to the combustion chamber in succession, a combustion fan provided on the air supply side to blow combustion air into the burner, and an air volume for detecting the air volume from the combustion fan to the burner Combustion comprising a sensor and fan control means for controlling the rotational speed of the combustion fan so as to match the detected airflow amount detected by the airflow sensor at the time of combustion operation of the burner with a set airflow amount for obtaining the required combustion amount of the burner. An apparatus, comprising: first calculating means for obtaining a value of a ratio of a detected air flow rate of said air flow sensor to a rotation speed of said combustion fan during said combustion operation; Obtaining a change amount between the value of the ratio H0 obtained by the first calculating means at the beginning of the combustion operation of the burner and the value H1 of the ratio obtained by the first calculating means during the subsequent burning of the burner; Two computing means; And an operation stop means for stopping the combustion operation when the amount of change in the value of the ratio (H0, H1) obtained by the second calculation means exceeds a predetermined amount. The combustion apparatus according to claim 6, wherein the ratio H0 at the beginning of the burn operation of the burner is a value of the ratio at the time of prepurge or ignition of the burner.