JP3012497B2 - Combustion equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation means for ventilating combustion air to a burner, a ventilation amount detecting means for detecting a ventilation amount of the combustion air, and a fuel supply amount supplied to the burner. Proper ventilation amount setting means for setting an appropriate ventilation amount to be performed, and control means for controlling an operation state of the ventilation means such that the ventilation amount detected by the ventilation amount detecting means becomes the proper ventilation amount. It relates to a combustion device.

[0002]

2. Description of the Related Art In a hot water supply apparatus as an example of the above-described combustion apparatus, conventionally, as shown in, for example, Japanese Patent Application Laid-Open No. 7-110126, a fan as a ventilation means is driven in a reference driving state (specifically, based on a command). Is the difference between the detected ventilation amount when driven at the reference rotation speed) and the appropriate ventilation amount corresponding to the reference rotation speed, or when the ventilation means is driven so that the reference ventilation amount is attained. If the deviation between the actual driving state (fan rotation speed) and the reference driving state (rotation speed) corresponding to the reference appropriate ventilation amount is equal to or larger than the set amount, the configuration of the apparatus is determined to be abnormal. There was something that was done.

[0003] The abnormality of the installation status of the device is, for example,
This is a state in which an abnormality has occurred in the ventilation path, such as the exhaust cylinder that discharges the combustion gas from the burner to the outside, which has deteriorated due to aging, has been damaged, or the exhaust cylinder has been removed. If the combustion is continued in this state, there is a disadvantage such as incomplete combustion or the like occurring. Therefore, such an abnormal state is detected.

Incidentally, the appropriate ventilation amount corresponding to the reference rotation speed or the reference driving state (rotation speed) corresponding to the reference appropriate ventilation amount is a function determined in advance in association with the burner fuel supply amount. Was obtained based on the

[0005]

By the way, in the combustion apparatus having the above-mentioned structure, it is considered that the state of ventilation by the ventilation means differs depending on the installation state of the apparatus. For example,
The length of the ventilation path for discharging the combustion gas from the burner to the outside may differ depending on the individual installation conditions,
Further, various states are conceivable, such as a difference in ventilation resistance due to the presence of the outer wall of the building near the air supply section or the exhaust section in the combustion air ventilation path.

However, in the above-described conventional configuration, the value used as a criterion for determining the installation status of the device is determined based on the standard installation status regardless of the individual installation status, as described above. Since it is uniformly obtained by a predetermined function in association with the supply amount, for example, when the ventilation resistance greatly changes from a standard value due to the difference in individual installation conditions as described above. There is a possibility that it may not be possible to accurately determine whether there is an abnormality in the ventilation path.

The present invention has been made in view of such a point, and an object of the present invention is to appropriately determine whether or not there is an abnormality in a ventilation path according to the installation status of each device. In providing a combustion device.

[0008]

According to the characteristic structure of the present invention, the ventilation means is controlled by the control means so that the operation state value of the ventilation means becomes the reference operation state value. The state of the ventilation path is determined by the ventilation state determination unit based on a deviation between the ventilation amount detected by the ventilation amount detecting unit and a reference ventilation amount corresponding to the reference operating state value. The ventilation amount is a value set by the reference ventilation amount setting means in accordance with the installation status of the device.

As a result, in a state where the ventilation means is driven at the reference operating state value, the reference ventilation amount as a reference for abnormality determination is set in a state corresponding to the installation state of the apparatus. Irrespective of the difference, it is possible to always determine whether or not the ventilation path is abnormal based on an appropriate reference ventilation amount according to the actual installation state of the device.

According to the characteristic configuration of the present invention, in the reference state in which the ventilation means is controlled by the control means such that the detected ventilation amount becomes the reference ventilation amount, the operating state value of the ventilation means is determined. Is detected by the operating state value detecting means, and ventilation is determined by the ventilation state determining means based on a deviation between the detected operating state value detected by the operating state value detecting means and a reference operating state value corresponding to the reference ventilation amount. The state of the route is determined, and the reference operation state value is a value set by the reference operation state value setting means in accordance with the installation state of the apparatus.

As a result, the reference operation state value of the ventilation means for setting the reference ventilation amount is set in a state corresponding to the installation state of the apparatus. The ventilation means is driven with an appropriate reference operating state value according to the actual installation state of the apparatus, so that it is possible to determine in an appropriate state whether or not the ventilation path is abnormal. .

According to the third aspect of the present invention, the reference ventilation amount setting means sets and stores the reference ventilation amount in accordance with a preset installation condition of the device, and sets the reference ventilation amount. Based on the installation status, since it is configured to set the reference ventilation amount corresponding to the installation status of the device,
The reference airflow corresponding to the actual installation status of the device can be reliably set.

When there are a plurality of installation conditions, a plurality of reference ventilation amounts are stored corresponding to the respective installation conditions, and a reference ventilation amount suitable for the actual installation condition is selected. Thus, the reference airflow amount is always set in an appropriate state.

According to a fourth aspect of the present invention, the reference operation state value setting means sets and stores the reference operation state value in accordance with a preset installation condition of the apparatus, and Since the reference operation state value corresponding to the installation state of the device is configured to be set based on the installation state of the device, the reference operation state value corresponding to the actual installation state of the device can be reliably set.

When there are a plurality of installation conditions, a plurality of reference operation state values are stored in correspondence with each of the installation conditions, and a reference operation state value suitable for an actual installation state is selected. Thus, the reference operation state value is always set in an appropriate state.

According to a fifth aspect of the present invention, in the reference state according to the first aspect,
Stable state determination means for determining whether the ventilation state is stable is provided. When the stable state determination means determines that the operation state is stable, the ventilation amount detection means detects the ventilation state. Since the air flow is configured to detect the air flow, the air flow is unstable, for example, the detected air flow fluctuates due to a strong wind blown to the exhaust part of the air flow path. Is different from the proper state, it is possible to avoid such disadvantages as detecting such an improper detected airflow.

According to a sixth aspect of the present invention, in the reference state according to the second aspect,
A stable state determining unit that determines whether the operating state of the ventilation unit is stable is provided, and the operating state value detecting unit determines that the operating state is stable by the stable state determining unit. And the operating state value is detected, so that the operating state of the ventilation means is in an unstable state, for example, due to a strong wind blown to the exhaust part of the ventilation path. Is changed and the operating state value is different from the proper state, it is possible to avoid such a disadvantage that such an inappropriate operating state value is detected.

According to a seventh aspect of the present invention, the reference air flow rate setting means is in a state in which the apparatus is in an initial installation state or in a state in which the apparatus is considered to be in an initial installation state, and
When the ventilation state is controlled such that the operation state value of the ventilation means becomes the set operation state value in the proper ventilation state, the detected ventilation amount of the ventilation amount detection means is determined by the reference ventilation. Since it is configured to be set as the amount, for example, a plurality of types of installation conditions are stored in advance, and the reference ventilation amount is set by designating which of the actual installation conditions is the actual installation condition. Compared to such a case, there is no need to consider variations due to individual differences in the equipment, and always, without any disadvantage such as specifying incorrect installation conditions, always accurately match the actual installation situation. It is possible to set a large reference ventilation volume.

According to the characteristic configuration of the present invention, the reference operating state value setting means is in a state in which the apparatus is in an initial installation state or in a state in which the apparatus is considered to be in an initial installation state, and in a proper ventilation state. In a state where the ventilation means is controlled such that the detected ventilation amount becomes the set ventilation amount, an operation state value detected by the operation state value detection means is set as the reference operation state value. For example, a plurality of types of installation conditions are stored in advance, and a reference operating state value is set by designating which of the actual installation conditions is the actual installation condition. It is not necessary to consider variations due to individual differences of the equipment compared to the case, and there is no disadvantage such as specifying incorrect installation conditions. Becomes that can be set to a reference operating state value.

According to a ninth aspect of the present invention, the deviation, that is, the deviation between the detected operation state value and the reference operation state value, or the detected ventilation amount and the reference ventilation amount are determined by the ventilation state determining means. If it is determined that the deviation exceeds the set amount, the safety operation means for executing a predetermined safety operation is provided, so that it is estimated that the deviation is large and the state of the ventilation path is abnormal. In this state, it is possible to prevent the disadvantages such as incomplete combustion of the burner by continuing to use without taking any measures.

According to a tenth aspect of the present invention, there is provided a display means for displaying at least one of the detected operation state value, the detected airflow amount, and the deviation. When the abnormality of the route is determined, by visually confirming the actual detection information, deviation, and the like, it is possible to more appropriately perform a countermeasure such as a subsequent maintenance process.

According to the eleventh aspect of the present invention, the ventilation state determination means is configured to determine the state of the ventilation path based on the command information of the command means. In addition to the case where the state of the installation is determined when installed at the same time, even after the installation, for example, the state of the ventilation path can be determined periodically or appropriately. Thus, it is possible to determine whether or not a problem has occurred in the ventilation path due to a problem caused by an obstacle or an external object such as a bird's nest.

According to the twelfth aspect of the present invention, since the command means is commanded by a manual operation, for example, in a maintenance work or the like, at an appropriate timing when the combustion operation is not performed. Thus, the state of the ventilation path can be appropriately determined, and the maintenance work can be performed efficiently.

According to the characteristic configuration of the present invention, the command means automatically issues a command at a predetermined timing set in advance. The state of the ventilation path is reliably and regularly determined without forgetting, and the use safety can be improved accordingly.

According to the invention, the ventilation state determination means automatically determines the state of the ventilation path when a set time has elapsed after the combustion of the burner is stopped. Thus, the state of the ventilation path can be properly determined in a stable state that is not affected by the variation of the ventilation amount due to the combustion of the burner.

According to a characteristic configuration of the present invention, the ventilating amount detecting means may be configured such that one end is opened in the ventilation path by the ventilation means, and that the one end is opened with the ventilation by the ventilation means. At a point where a pressure difference is generated, a communication pipe having the other end opened and a flowmeter for the airflow inside the communication pipe are provided, so that both ends of the communication pipe are opened by the ventilation by the ventilation means. A pressure difference is generated between the opened portions, an airflow proportional to the pressure difference flows inside the communication pipe, and the flow velocity is detected by the flow velocity meter. Then, the ventilation amount is detected based on the detected value. Therefore, it is possible to appropriately detect the ventilation amount regardless of the combustion state of the burner.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A combustion device according to the present invention will be described below. FIG. 1 shows a hot water supply device as an example of a combustion device. This hot water supply apparatus is provided with a hot water supply unit K for heating water to supply hot water, a control unit H for controlling the operation of the hot water supply unit K, and a remote control operation unit R for instructing the control unit H to give control information. .

The hot water supply section K determines whether or not a gas-fired burner 2 is provided in the combustion chamber 1, a heat exchanger 3 heated by the burner 2, an igniter 4 for igniting the burner 2, and whether or not the burner 2 is ignited. A flame rod 5 or the like is provided as a combustion state detecting means for detecting, and a fan 6 is provided as a ventilation means which allows the combustion air to flow through the burner 2 and whose ventilation amount can be changed and adjusted. . The fan 6 is driven by a motor (not shown).
A rotation speed sensor 7 is provided as operation state value detection means for detecting the actual rotation speed (an example of an operation state value).

The heat exchanger 3 is connected to a water inlet 8 to which water is supplied and a hot water outlet 9 for supplying hot water to a hot water tap (not shown). The water inlet 8 is turned on when the amount of water exceeds a set water amount.
A water flow switch 10 that turns off when the amount of water falls below a set water amount is provided, and a tap water temperature thermistor 11 that detects a tap water temperature is provided in the tap water path 8. Further, the fuel supply passage 12 for the burner 2 is provided with an electromagnetically operated on-off valve 13 and an electromagnetically operated gas proportional valve 14 capable of changing and adjusting the fuel supply amount.

An air flow sensor 15 is provided as air flow detecting means for detecting the air flow of the fan 6. This air volume sensor 15 has one end opened at the upper side of the burner 2 in the ventilation path of the fan 6,
A communication pipe 15a having the other end opened at a lower side of the burner 2 where a pressure difference is generated between the communication pipe 15a and the opening having the one end opened due to the ventilation by the fan 6, and an air flow inside the communication pipe 15a. And a velocity meter 15b for

The remote control operation unit R is communicably connected to the control unit H. The operation switch 16 instructs the control unit H to start and stop the hot water supply operation. H, a temperature setting switch 17 for instructing H, a display section 18 for displaying hot water temperature, etc., a determination switch 19 for instructing a start of determination of a ventilation state as described later, an abnormality display for displaying an abnormality as described later A lamp 20 and the like are provided.

The control section H is provided with a microcomputer, and detects information of each detection means such as the water flow switch 10, the tap water temperature thermistor 11, the air flow sensor 15, the frame rod 5, and the control information of the remote control operation section R. Is input, and based on the information, the on-off valve 11,
The operation of the gas proportional valve 14, the fan 6, the igniter 4, and the like is controlled.

The control unit H supplies a fuel supply amount I to the burner 2 based on the detected hot water temperature, the target hot water supply temperature, and the like.
p, gas flow control means 100 for adjusting the gas proportional valve 14, proper air flow setting means 101 for setting an appropriate air flow in response to the fuel supply amount Ip, Fan control means 102 as control means for controlling the operation state of the fan 6 (ventilation means) so that the amount of ventilation is attained. In the reference state where the fan 6 is controlled such that the rotation speed becomes the reference rotation speed, Air flow sensor 1
5, based on a deviation between the detected ventilation amount detected by 5 and the reference ventilation amount corresponding to the reference rotation speed, the ventilation state determination unit 103 that determines the state of the ventilation path, The reference ventilation amount setting means 104 for setting the reference ventilation amount, the stable state determination means 105 for determining whether or not the ventilation amount is stable in the reference state, and the ventilation state determination means 103, When it is determined that the distance exceeds the threshold, each of the safe operation means 106 for executing a predetermined safe operation is provided in the form of a control program.

The reference ventilation amount setting means 104 sets and stores a reference ventilation amount corresponding to a preset installation condition of the device, and designates the actual installation condition of the device, thereby setting the installation status of the device. Is configured to set the reference airflow amount corresponding to. Further, the ventilation state determining means 1
Reference numeral 03 is configured to determine the state of the ventilation path based on command information obtained by manually operating the determination switch 19.

That is, a setting operation section 21 for setting a reference ventilation volume is provided. The setting operation section 21 includes the setting switch 22 for instructing the start of a setting operation, a numerical input key (numeric keypad) 23, A number display unit 24 for displaying information, a completion switch 25 for instructing completion of setting, and the like are provided. The unit is provided in the water heater main body case separately from the remote control operation unit R so as not to be used by a general user. .
The above-described setting of the reference ventilation amount is performed by an installation worker or the like after the hot water supply device is installed.

Next, the operation of the control unit will be described with reference to the control flowcharts shown in FIGS.
After a power switch (not shown) provided on the water heater main body is turned on, a reference airflow is set based on the installation conditions of the water heater (step 1). This operation is performed by a manual operation. Specifically, since the length of the exhaust pipe 26 in which the exhaust path of the burner 2 is formed differs depending on the installation condition, the reference ventilation amount is set based on the length of the exhaust pipe 26 as an actual installation condition. I do. In addition, the diameter of the exhaust pipe 26 is set as a standard constant value. For example, FIG.
As shown in the figure, the fan rotation speed is changed to a reference rotation speed (for example, 30
The change characteristic between the length L of the exhaust pipe and the reference airflow while maintaining the rotation speed at 00 rpm) is set and stored in advance through experiments and the like. That is, the reference ventilation number is set and stored in accordance with the installation condition of the apparatus. Then, the setting switch 22
To start the setting by operating the
Is input using the numerical value input keys 23. Here, a part bent in an L-shape, for example, in the middle of the exhaust pipe is converted to a length equivalent to 0.7 times the length of the cylindrical straight pipe. As shown in FIG.
If the length L of the exhaust stack is input set, set the reference air quantity q _C corresponding thereto, to configure and operate the completion switch 25 completes. Note that the hatched area in FIG. 2 indicates an allowable range. When a value exceeding the maximum value _LMAX is set as the length of the exhaust cylinder, it is reported as abnormal.

Thus, the reference airflow q for the installation condition
_When the determination switch 19 is operated after the setting of _C is completed, the detected rotation speed is changed to the reference rotation speed (3000 rpm).
m), the fan 6 is operated (steps 2 and 3). Then, it is determined whether or not the state in which the variation width of the detected ventilation amount of the air volume sensor is equal to or less than the set amount continues for about 10 seconds, and whether the ventilation volume is stabilized (step 4). Therefore, it is determined whether or not there is a stable state without disturbance due to the influence of wind or the like. If the amount of ventilation is not stable even after 5 minutes, the abnormality indicator lamp 23 is turned on to notify the abnormality (steps 5 and 6). When the ventilation volume is stabilized, the detected ventilation volume at that time is read, and the deviation between the detected ventilation volume and the reference ventilation volume and the detected ventilation volume are displayed on the display unit 18 as display means (Step 7, Step 7).
8). Next, it is determined whether or not the ventilation state is good based on whether or not the deviation exceeds a set amount. If the deviation exceeds the set amount, it is determined that there is an abnormality in the ventilation state, and the abnormality is notified. (Steps 9 and 6). If not, it indicates that it is normal (step 10). And fan 6
Is stopped and the determination switch 19 is turned off, the hot water supply operation standby state is set (steps 11, 12, 1).
3). After the abnormal display is performed in step 6, the operation of the fan 6 is stopped so that the driving operation cannot be performed until the power switch is turned on or off or a reset switch (not shown) is operated. (Steps 14 and 15). These operations correspond to safe operations.

Thereafter, when the water flow is started and the water flow switch 10 is turned on while the operation switch 16 is turned on, the ignition operation for the burner is started, and the calculation is performed based on information such as the detected hot water temperature and the target hot water supply temperature. Fuel supply amount Ip
The gas proportional valve 14 is controlled so that
19) At the same time, the fan 6 is controlled so as to have an appropriate ventilation amount (step 20). This fan control
This is performed as shown in FIG. First, as shown in FIG. 3, contact in advance based on the characteristics of proper ventilation amount for the set fuel supply quantity Ip stored sets seeking proper ventilation quantity q _S with respect to the fuel supply amount Ip at that time There are (step 201), as shown in FIG. 4, on the basis of the change characteristics of the target rotational speed for the fuel supply quantity Ip being set previously stored, obtains a target rotational speed r _s for the fuel supply quantity Ip at that time , the detected rotation speed detected by the engine speed sensor 7 controls the operation of the fan 6 so that the target speed r _s (step 202).

Then, the actual air flow q
by detecting the _r, it calculates a rotation speed correction value on the basis of the detection air amount q _r and proper ventilation quantity q _S (step 203,
204). Specifically, the correction value k is calculated by the following equation (Equation 1).

[0040]

## EQU1 ## k = q _S / q _r

Next, the target rotation speed r _s of the fan 6 is corrected by multiplying by the correction value k, and the operation of the fan 6 is feed-forward controlled so as to reach the corrected rotation speed r ₁ (step 205). Then, detection ventilation amount q _r and proper ventilation amount q _S
The feedback control is performed so that the deviation from the difference becomes small (step 206). If the detected rotation speed of the fan 6 exceeds the preset upper limit rotation speed (4200 rpm) for a set time (10 seconds) or more, the control of the fan 6 is considered to be at the control limit (abnormal state) and the combustion of the burner 2 is determined. The operation is stopped, and the operation proceeds to step 6 to enter the operation check state (steps 207, 208, 209).

Thereafter, when the water flow switch 10 is turned off, the combustion of the burner 2 is stopped, and a post-purge for operating the fan 6 for a set time is executed thereafter (steps 21, 22, 23), and the hot water supply standby state is set. Return.

The determination control of the ventilation state based on the operation of the determination switch 19 as described above is performed not only at the initial stage of installation but also at the initial stage.
It is possible to appropriately execute even after that. With this configuration, it is possible to determine whether the ventilation state is good or not by operating the determination switch 19 not only at the initial stage of installation of the device but also thereafter. Can be done. Therefore, for example, the ventilation state becomes abnormal due to the presence of a bird's nest in the exhaust pipe with use,
In the case of damage due to aging, the abnormal state can be effectively determined.

[Another Embodiment] (1) Instead of the configuration in which the ventilation state determination means is instructed based on a manual operation as described above, a configuration in which an instruction is automatically issued at a predetermined timing as follows. It may be.
Note that the control in the state where the burner is burning is the same as the above-described configuration, and therefore only the control after the combustion is stopped will be described.

FIG. 8 shows a flowchart of the automatic discrimination control. When the normal combustion operation is completed and five hours have elapsed since the burner 2 stopped burning, the ventilation state determination control is executed (steps 30 to 35) similarly to the determination control as shown in FIG. Return to the state (step 36).
If the ventilation amount is not stable even after 5 minutes, the abnormality display is performed only when such a state is detected three times or more (steps 37 to 42). The reason is that, in this embodiment, since the automatic execution is performed irrespective of the user's intention, performing the abnormality notification by the disturbance such as the strong wind based on only one detection may cause confusion. Because there is.

Further, instead of the above-described automatic operation performed after the set time has elapsed after the burner combustion is stopped, the discriminating operation may be performed every time the cumulative combustion time reaches the set time. .

Further, the configuration instructed based on the manual operation and the configuration automatically instructed as described above may be used in combination.

(2) Instead of the reference ventilation amount setting means 104, reference rotation speed setting means for setting a reference rotation speed corresponding to the reference ventilation amount in accordance with the installation status of the apparatus is provided. Alternatively, the configuration may be such that the ventilation state is determined using the reference rotation speed. In this embodiment, for example,
As shown in FIG. 9, a reference rotation speed is used instead of the reference ventilation amount as data stored corresponding to the installation state of the device (length of the exhaust stack). In the discrimination control operation, in step 3 of FIG. 5 or step 31 of FIG. 8, the fan is controlled so as to have the reference ventilation amount, and ventilation is performed based on the deviation between the detected rotation speed and the reference rotation speed. The state will be determined. Further, in step 4, it is determined whether or not the fluctuation range of the detected rotational speed has become stable based on whether or not the state in which the fluctuation width is equal to or less than the set amount has continued for the set time or longer.

(3) The installation condition is not limited to the length of the exhaust cylinder, but may be set by using map data based on both data of the length of the exhaust cylinder and the diameter of the exhaust cylinder. May be used.

(4) The reference rotation speed setting means 104
When the device is in the initial state of installation and is in a proper ventilation state, the rotation is detected by the rotation speed sensor 7 in a state where the fan is controlled so that the detected ventilation amount becomes the reference ventilation amount. The number of revolutions may be set as the reference number of revolutions.

That is, the reference rotation speed is not set and stored in advance on the basis of the installation state of the apparatus (for example, the length of the exhaust pipe), but the apparatus is properly installed and the ventilation state is good. After checking that the setting switch 22
In accordance with the operation, the fan is controlled so as to be at the reference rotation speed, and in the state where the ventilation amount is stable, the detected ventilation amount at that time is detected and stored as the reference ventilation amount in the appropriate ventilation state. It is. In this case, the numerical input keys 23 and the numerical display 24 are not required.

FIG. 10 shows a flowchart of the reference ventilation amount storage control. The apparatus is initially installed, and it is inspected whether the ventilation state is proper. If the state is not proper, the apparatus is repaired, and an adjustment operation or the like is performed (steps 50 to 52).
Note that such inspection, adjustment work, and the like are performed artificially by an installation worker. When the inspection is completed and it is determined that the apparatus is in a proper installation state and the setting switch 22 is operated,
The operation control of the fan 6 is performed so that the reference rotation speed is obtained (steps 53 and 54). When the ventilation amount is stabilized, the ventilation amount is detected by the ventilation sensor 15, and the detected ventilation amount is set as the reference ventilation amount. Is stored (steps 55 and 5).
6, 57). When the reference airflow is stored, the fan 6 is stopped, and when the setting switch is turned off, the operation returns to the operation standby state (steps 58 and 59). If the amount of ventilation is not stable even after 5 minutes, an error is displayed and the fan 6
To stop the control (steps 60, 61,
62). In this case, the setting switch 22
Can be operated to execute the control.

In the subsequent determination operation, it is determined whether or not the ventilation state is good based on the difference between the reference ventilation amount stored as described above and the detected ventilation amount. .

With this configuration, compared to the case where a plurality of reference rotation speeds are previously obtained through experiments or the like and set and stored, the actual installation conditions are always taken into account without considering the variation due to individual differences of the devices. Thus, a reference rotation speed suitable for the condition can be obtained, and an accurate ventilation state can be determined.

Further, not only when the apparatus is installed but also after maintenance processing such as inspection and repair is completed,
That is, the configuration may be such that the reference rotation speed is stored in a state where the apparatus is considered to be in an initial installation state.

(5) The reference rotational speed setting means in the embodiment (2) is similar to the embodiment (4),
The detection in a state where the fan is controlled so that the device is in the initial installation state or in a state considered to be in the initial installation state, and is in a proper ventilation state, so that the fan has a reference ventilation amount. The configuration may be such that the rotation speed is set and stored as the reference rotation speed.

(6) As described above, instead of the configuration in which the reference values (operating state values, ventilation volumes) are previously set and stored as the change characteristic data with respect to the installation conditions, the following configuration may be used. . That is, even if the predetermined installation condition is of one type and one reference value (operation state value, ventilation volume) corresponding to the installation condition is set and stored in advance, the actual installation Then, the installer determines whether or not the actual installation condition matches the set condition. If the condition is satisfied, the value stored and set is set as the reference value. If the conditions do not match, a value corrected (eg, a value multiplied by a correction coefficient) with respect to a value stored and stored under a predetermined correction condition according to the actual installation condition. , Etc.) may be set as the reference value by the numerical input keys or the like.

(7) Instead of the air flow sensor 15, the air flow amount detecting means may detect the air flow by using a differential pressure gauge which directly detects a pressure difference between both ends of the communication pipe. Alternatively, a sensor for detecting the concentration (for example, oxygen concentration) of a specific component in the combustion gas may be provided, and the ventilation amount may be indirectly detected based on the detected concentration.

(8) The operating state value of the fan as the ventilation means is not limited to the number of rotations, but may be a voltage value applied to the fan, a current value, or a duty ratio when pulse driving is performed. It can be controlled using various operating state values.

Incidentally, reference numerals are written in the claims to facilitate comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a water heater.

FIG. 2 is a graph showing a relationship between a length of an exhaust cylinder and a reference ventilation amount.

FIG. 3 is a graph showing a relationship between a fuel supply amount and an appropriate ventilation amount.

FIG. 4 is a graph showing a relationship between a fuel supply amount and a target rotation speed.

FIG. 5 is a flowchart of a control operation.

FIG. 6 is a flowchart of a control operation.

FIG. 7 is a flowchart of a control operation;

FIG. 8 is a flowchart of a control operation according to another embodiment.

FIG. 9 is a graph showing the relationship between the length of the exhaust cylinder and the reference rotation speed in another embodiment.

FIG. 10 is a flowchart of a control operation according to another embodiment.

[Explanation of symbols]

 2 Burner 6 Ventilation means 7 Operating state value detection means 15 Ventilation amount detection means 18 Display means 19 Command means 101 Appropriate ventilation amount setting means 102 Control means 103 Ventilation state determination means 104 Reference ventilation amount setting means 105 Stable state determination means 106 Safe operation means

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F23N 5/18 101 F23N 5/24 104

Claims (15)

(57) [Claims] A ventilation means (6) for ventilating combustion air to a burner (2), and a ventilation amount detecting means (1) for detecting a ventilation amount of the combustion air.
5); an appropriate ventilation amount setting means (101) for setting an appropriate ventilation amount corresponding to a fuel supply amount supplied to the burner (2); A control means (102) for controlling an operation state of the ventilation means (6) so as to provide a ventilation amount, wherein an operation state value of the ventilation means (6) is a reference operation state. In a reference state in which the ventilation means (6) is controlled so as to have a value, the difference between the ventilation amount detected by the ventilation amount detecting means (15) and the reference ventilation amount corresponding to the reference operation state value is calculated. A combustion state determination means (103) for determining the state of the ventilation path based on the air flow, and a reference ventilation amount setting means (104) for setting the reference ventilation amount according to the installation status of the apparatus. apparatus. 2. A ventilation means (6) for ventilating combustion air to a burner (2), and a ventilation amount detecting means (1) for detecting a ventilation amount of the combustion air.
5); an appropriate ventilation amount setting means (101) for setting an appropriate ventilation amount corresponding to a fuel supply amount supplied to the burner (2); A control unit (102) for controlling an operation state of the ventilation unit (6) so that the ventilation amount is equal to the ventilation amount, wherein the detected ventilation amount is a reference ventilation amount. In a reference state in which the ventilation means (6) is controlled, an operation state value detection means (7) for detecting an operation state value of the ventilation means (6), and an operation state value detected by the operation state value detection means (7). A ventilation state determining means (103) for determining a state of a ventilation path based on a deviation between the detected operation state value and a reference operation state value corresponding to the reference ventilation amount; Reference work to set the reference operation state value Combustion apparatus in which the state value setting means. 3. The reference ventilation amount setting means (104) sets and stores a reference ventilation amount in accordance with a preset installation condition of the device, and based on an actual installation condition of the device. The combustion apparatus according to claim 1, wherein the reference airflow amount corresponding to the installation status of the combustion apparatus is set. 4. The reference operation state value setting means, wherein a reference operation state value is set and stored in accordance with a preset installation condition of the apparatus, and based on an actual installation state of the apparatus, 3. The combustion apparatus according to claim 2, wherein the reference operating state value corresponding to an installation state is set. 5. A stable state determining means (105) for determining whether or not the ventilation state is stable in the reference state, wherein the ventilation amount detecting means (15) is provided with the stable state determining means (105). 4. The combustion apparatus according to claim 1, wherein when the operation state is determined to be stable, the detected ventilation amount is detected. 6. A stable state judging means (105) for judging whether or not the operation state of the ventilation means (6) is stable in the reference state, wherein the operation state value detecting means is State determination means (1
The combustion apparatus according to claim 2 or 4, wherein when the operation state is determined to be stable according to (05), the operation state value is detected. 7. The ventilation means, wherein the reference ventilation amount setting means (104) is provided when the apparatus is in an initial installation state or in a state regarded as an initial installation state and is in a proper ventilation state. The ventilation amount detected by the ventilation amount detecting means (15) in a state where the ventilation means (6) is controlled so that the operation state value of (6) becomes the set operation state value is defined as the reference ventilation amount. The combustion device according to claim 1, wherein the combustion device is configured to be set. 8. The reference operating state value setting means, when the apparatus is in an initial installation state or in a state regarded as an initial installation state, and is in a proper ventilation state, the detected ventilation amount is In a state in which the ventilation means (6) is controlled so as to be a reference ventilation amount, an operation state value detected by the operation state value detection means (7) is set as the reference operation state value. The combustion device according to claim 2 or 6, wherein 9. A safety operation means (106) for executing a predetermined safety operation when the ventilation state determination means (103) determines that the deviation exceeds a set amount.
The combustion device according to claim 1, 2, 3, 4, 5, 6, 7, or 8, further comprising: 10. A display means (18) for displaying at least one of the detected operation state value, the detected airflow amount, and the deviation.
The combustion device according to 3, 4, 5, 6, 7, 8, or 9. 11. The ventilation state determining means (103) is configured to determine the state of the ventilation path based on command information of a commanding means (19).
The combustion device according to 3, 4, 5, 6, 7, 8, 9 or 10. 12. A combustion apparatus according to claim 11, wherein said command means (19) is commanded by manual operation. 13. A combustion apparatus according to claim 11, wherein said command means (19) automatically issues a command at a predetermined timing set in advance. 14. The combustion apparatus according to claim 13, wherein the predetermined timing is a point in time when a set time has elapsed after the combustion of the burner (2) has stopped. 15. The ventilation amount detecting means (15) has one end opened in a ventilation path of the ventilation means (6), and a portion of which one end is opened with the ventilation by the ventilation means (6). A communication pipe (15a) having the other end opened at a position where a pressure difference is generated between the communication pipe (15a) and a flowmeter (15) for the airflow inside the communication pipe (15a).
b) and b).
5, 6, 7, 8, 9, 10, 11, 12, 13, or 14
A combustion device as described.