JP2002317929A - Combustion equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide combustion equipment, in which a stable combustion can be secured, even if the length of an exhaust pipe and the height of an installation position are changed. SOLUTION: The combustion equipment comprises an exhaust-setting means 50, a height-setting means 51, a vaporizer heater 73, a vaporizer temperature sensor 91, and a controller 5. The exhaust setting means 50 makes setting in accordance with the state of installation of the exhaust pipe connected to the combustion equipment 1, and the height setting means 51 makes setting in accordance with the height of installation of the combustion equipment. The controller 5 controls supply of air and fuel gas. When vaporizer temperature has reached a predetermined temperature during preheating control of the vaporizer heater 73, the control means 5 performs a preheating control such that a fan 2 is driven in accordance with setting of the exhaust setting means 50, unburned gas stagnating in the inside of the combustion equipment 1 is scavenged to the outside through an exhaust pipe 105, and then finishes the preheating. On the other hand, the means 5 also performs combustion control based on correction control values in which an exhaust correction and a height correction have been done at least in either of the air supply amount and the fuel-gas supply amount in accordance with settings of the means 50 and the means 51.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion apparatus, and more particularly, to a combustion apparatus capable of performing stable combustion even when the laying state of an exhaust pipe connected to the combustion apparatus or the altitude of an installation place of the combustion apparatus fluctuates. .

[0002]

2. Description of the Related Art Even now, when city gas and propane gas are widely used, hot water heaters, heaters, and the like still use inexpensive liquid fuels such as kerosene in order to reduce running costs. Among them, when used for applications having a relatively small calorific value, a type in which a liquid fuel is vaporized by a vaporizer and the vaporized fuel gas is sent to a combustion section and burned is often used ( Tokuhei 7-213
No. 32).

[0003] In such a combustion apparatus, the fuel gas and the air vaporized by the vaporizer are mixed in advance and injected from the flame holes.
Then, the secondary air is directly supplied to the combustion section, and the fuel gas is burned by the premixed air and the secondary air. Therefore, the amount of primary air preliminarily mixed with fuel and the amount of secondary air supplied to the combustion section can be significantly increased according to the level of stable combustion and the turndown ratio (variation ratio when the gas amount or air amount is greatly varied). To fluctuate. For this reason, stable combustion cannot be obtained unless the amount of combustion and the amount of supply air are carefully controlled during combustion.

An exhaust pipe is attached to the main body of the combustion device so that the exhaust gas is discharged to a position distant from the living area, not only when the combustion device is installed indoors but also when the combustion device is installed outdoors. . However, the length of the exhaust pipe may increase depending on the installation location of the combustion device, or the number of bent exhaust pipes may increase because the exhaust pipe is laid along a wall or the like. On the other hand, in a combustion device using a liquid fuel, as described above, a liquid fuel such as petroleum is vaporized in a vaporizer to generate a fuel gas. If liquid fuel remains for some reason inside the vaporizer, there is a problem in that the fuel gas which has been vaporized and stays at the time of ignition after the completion of preheating burns rapidly and flashback occurs. In order to avoid such a problem, at the time of ignition, a pre-purge is performed in which the generated fuel gas is driven by a blower to discharge the gas.

[0005]

However, even if the pre-purge is performed for a predetermined period of time, if the length of the exhaust pipe is long or the number of bends is large depending on the state of laying of the exhaust pipe, the unburned gas remaining in the exhaust pipe will remain. Could not be exhausted completely.

On the other hand, apart from such a problem of the prepurge, there is a problem of a decrease in the oxygen concentration when the combustion device is installed at a high altitude. That is, the air concentration is lower in the highland than in the lowland, and the oxygen concentration is also reduced accordingly. For this reason, at high altitudes, even if air is blown by driving the blower at a predetermined rotation speed, an oxygen amount corresponding to the amount of combustion cannot be supplied, and incomplete combustion has occurred. Also, if the combustion device is installed at high altitude and the exhaust pipe is long,
Sufficient scavenging cannot be performed, and stable ignition and combustion cannot be performed. Therefore, improvement has been desired. The present invention has been proposed in view of such circumstances, and a combustion apparatus capable of ensuring stable combustion even when the length of an exhaust pipe connected to the combustion apparatus or the installation altitude of the combustion apparatus fluctuates. It is intended to provide.

[0007]

The present invention proposed to achieve the above object has a vaporizer for vaporizing a liquid fuel to produce a fuel gas, and is supplied from the produced fuel gas or a blower. In a combustion device that sends a mixed gas of air and fuel gas to a combustion unit to burn it, exhaust setting means that is switched and set according to the length or laid state of an exhaust pipe connected to the combustion device, and a carburetor A vaporizer heater for heating, a vaporizer temperature sensor for detecting the temperature of the vaporizer,
Control means for controlling the supply of air and fuel gas, wherein the control means, after the carburetor temperature reaches a predetermined temperature during the preheating control of the carburetor heater, according to the setting of the exhaust setting means The blower is driven to scavenge unburned gas remaining inside the combustion device to the outside through an exhaust pipe, and thereafter, preheating is completed.

When the length of the exhaust pipe connected to the combustion apparatus and the number of bent exhaust pipes due to the laying increase, even if the inner diameter of the exhaust pipe is the same, if the exhaust pipe is short and the number of bent pipes is small, In comparison, the amount of air required to scavenge the inside of the exhaust pipe increases. Further, the fluid resistance of the exhaust gas flowing inside the exhaust pipe also increases. For this reason, even if the driving state (driving voltage) of the blower is the same, the time for driving the blower increases as the exhaust pipe becomes longer and as the number of bends increases, or If the amount of air is not increased, the exhaust pipe cannot be completely scavenged. In other words, if the blower drive condition (drive time, drive voltage, etc.) remains constant, scavenging cannot be carried out sufficiently depending on the exhaust pipe laying condition, and the residual unburned gas vaporized by preheating will suddenly ignite during ignition. There is a problem of burning or flashback.

According to the present invention, scavenging is performed by driving the blower according to the setting of the exhaust setting means. That is, the unburned gas remaining inside the exhaust pipe is completely scavenged by changing the drive state of the blower according to the length of the exhaust pipe and the number of bends. Thereby, stable ignition can be performed. In order to change the drive state of the blower according to the setting of the exhaust setting means, the drive time (drive voltage) may be increased or decreased by keeping the drive time constant, or the drive time may be increased or decreased by keeping the drive force constant. Can be taken.

For example, when the exhaust pipe is long and has a large number of bends, it is possible to increase the drive time of the blower or increase the drive voltage of the blower to perform scavenging. Here, the temperature of the vaporizer at the start of driving of the blower can be set as appropriate, but it is desirable to set the temperature at which the liquid fuel inside the vaporizer is sufficiently vaporized. Also,
According to the present invention, the preheating completion notification is performed after the scavenging is performed, so that it is possible to immediately shift to the combustion control after the completion of the preheating, and the usability is improved.

A combustion device according to the present invention, which is simultaneously proposed, generates a fuel gas by vaporizing a liquid fuel, and sends out the generated fuel gas or a mixed gas of air and fuel gas to a combustion portion for combustion. Has exhaust setting means switched and set according to the length or laying state of an exhaust pipe connected to the combustion device, and control means for controlling supply of air and fuel gas. Combustion control is performed based on a correction control value obtained by performing exhaust correction on at least one of the air supply amount and the fuel gas supply amount according to the setting of the exhaust setting unit.

As the length of the exhaust pipe increases,
As the number of bends increases, the fluid resistance of the exhaust gas flowing inside the exhaust pipe increases. For this reason, even if the driving state of the blower is the same, the amount of air supplied to the combustion section is reduced as compared with the case where the exhaust pipe is short and the number of bends is small, and incomplete combustion is likely to occur. According to the present invention, the air supply amount (blowing amount)
Alternatively, the fuel gas supply amount (combustion amount), or both the combustion amount and the blowing amount, are corrected based on the setting of the exhaust setting means, that is, the setting value corresponding to the length of the exhaust pipe and the number of bends. Control is performed.

For example, when the exhaust pipe is long, the combustion amount is increased as compared with the case where the exhaust pipe is short, or the combustion amount is reduced, while the combustion amount is reduced without changing the combustion amount, and the combustion control is corrected. Can be. It is also possible to perform control to decrease the amount of combustion and increase the amount of blown air. Thus, the combustion control corrected according to the laying state of the exhaust pipe is performed, and stable combustion can be performed.

The setting of the exhaust setting means can be switched and set in two stages, for example, when the length is greater than or less than these values, using a predetermined length and a predetermined number of bends as a guide. In addition, the setting may be finely divided into three or more stages.
Further, the combustion control value corresponding to the exhaust setting means is obtained by storing the setting value of the exhaust setting means and the combustion control value of the combustion amount and the blowing amount in advance as a data table in the control means. It is possible to perform optimal control.

A combustion device according to the present invention, which is simultaneously proposed, generates a fuel gas by vaporizing a liquid fuel, and sends out the generated fuel gas or a mixed gas of air and fuel gas to a combustion portion for combustion. Has an altitude setting means switched and set according to the installation altitude of the combustion device, and a control means for controlling the supply of air and fuel gas. The combustion control is performed based on a correction control value obtained by performing altitude correction on at least one of the supply amount and the fuel gas supply amount.

Since atmospheric pressure is applied to the atmosphere distributed in layers on the ground surface, the air concentration decreases as the altitude increases, and the amount of oxygen contained in a unit volume decreases. For this reason, if an appropriate combustion control amount (burning amount and blowing amount) is applied to a highland as it is in a lowland, the supplied air amount (oxygen amount) becomes insufficient and incomplete combustion occurs. However, the combustion device needs to be installed from low altitude to high altitude regardless of the location and perform stable combustion, and some switching setting for correcting the combustion control value is required according to the installation location. According to the present invention, combustion control is performed in which the air supply amount (blowing amount) or the fuel gas supply amount (burning amount), or both the burning amount and the blowing amount are corrected according to the setting of the altitude setting means. . The altitude setting means can be set to, for example, three levels of low altitude (reference altitude), semi-altitude and high altitude, or subdivided into four or more levels.

For example, when switching to high altitude is performed, compared to the case of low altitude setting, combustion control is performed to increase and correct the air flow while maintaining the amount of combustion, or conversely, to decrease and correct the combustion amount while maintaining the air flow. I do. Further, it is also possible to perform a correction combustion control for reducing the combustion amount and increasing the air blowing amount. This makes it possible to perform optimal combustion according to the altitude. By storing the combustion control value according to the setting of the altitude setting means in the control means in advance as a data table, the corrected combustion control can be immediately performed with reference to the data table.

[0018] The combustion device of the present invention proposed at the same time has a configuration in which the present invention described in claims 2 and 3 is combined.
That is, in a combustion device that vaporizes a liquid fuel to generate a fuel gas, and sends out the generated fuel gas or a mixed gas of air and fuel gas to a combustion unit for combustion, an exhaust pipe connected to the combustion device is provided. Exhaust setting means switched and set in accordance with the length or laying state, altitude setting means switched and set in accordance with the installation altitude of the combustion device, and control means for controlling supply of air and fuel gas The control unit performs the combustion control based on a correction control value obtained by performing the exhaust correction and the altitude correction on at least one of the air supply amount and the fuel gas supply amount according to the settings of the exhaust setting unit and the altitude setting unit. It has a configuration.

According to the present invention, the combustion control corrected by appropriately combining the exhaust setting and the altitude setting can be performed. This makes it easy to make settings in accordance with the installation altitude of the combustion device and the laying state of the exhaust pipe, and secures stable combustion by the corrected combustion control. In this configuration as well, a data table in which the combustion control values (blowing amount and combustion amount) correspond to each combination of the settings of the altitude setting means and the exhaust setting means is stored in the control means in advance, so that the data table can be referred to. Thus, the corrected control can be performed immediately.

The combustion device of the present invention proposed at the same time has a configuration in which the present invention described in claims 1, 2 and 3 is combined. That is, in a combustion device that has a vaporizer that vaporizes liquid fuel to generate fuel gas, and sends out the generated fuel gas or a mixed gas of air and fuel gas supplied from a blower to a combustion unit and burns it. Exhaust setting means switched according to the length or laying state of the exhaust pipe connected to the combustion device, altitude setting means switched set according to the installation altitude of the combustion device, and vaporization for heating the vaporizer Heater, a vaporizer temperature sensor for detecting the temperature of the vaporizer, and control means for controlling the supply of air and fuel gas. The control means controls the vaporizer temperature during the preheating control of the vaporizer heater. After the temperature reaches a predetermined temperature, the blower is driven according to the setting of the exhaust setting means, and the unburned gas remaining inside the combustion device is scavenged to the outside through an exhaust pipe. line On the other hand, according to the settings of the exhaust setting means and the altitude setting means, combustion control is performed based on a correction control value obtained by performing exhaust correction and altitude correction on at least one of the air supply amount and the fuel gas supply amount. .

According to the present invention, the unburned gas remaining inside the exhaust pipe can be completely scavenged by changing the drive state of the blower according to the length and the number of bends of the exhaust pipe. Ignition can be performed. In addition, stable combustion can be ensured by combustion control corrected in accordance with the installation altitude of the combustion device and the laying state of the exhaust pipe. Further, the setting at the time of installation of the combustion device is easy.

In the present invention, a can body for exchanging heat generated in the combustion section with the internal passing water or the internal storage water;
An incoming water temperature sensor for detecting an incoming water temperature flowing into the can body,
It has a tapping temperature sensor for detecting the tapping temperature flowing out of the can body, and a tapping amount adjusting means for adjusting the tapping amount of the can body, and the control means is adapted to set the exhaust setting means or the altitude setting means. In order to make the hot water temperature by the exhaust control or the altitude-corrected combustion control close to the target set temperature, a hot water amount correction signal corresponding to the incoming water temperature and the hot water temperature is sent to the hot water amount adjusting means to correct the hot water amount. A configuration for performing control can be adopted.

As described above, in order to ensure stable combustion at high altitudes (areas with low air concentration), for example, if the combustion amount (number) is reduced while the blown air amount is kept unchanged, the combustion amount decreases. The temperature of the hot water drops. For this reason, the tapping temperature is lower than the set temperature, and the usability is impaired. In the present invention, the amount of hot water is adjusted in order to compensate for a drop in hot water temperature accompanying a decrease in the amount of combustion. That is, when the combustion control corrected by the setting of the altitude setting means or the exhaust setting means is performed, a hot water amount correction signal is generated and sent to the hot water amount adjusting means so as to maintain the hot water temperature at the target set temperature. I do. This makes it possible to adjust the amount of hot water to compensate for fluctuations in the hot water temperature.

In the present invention, the control means stores the set value of the altitude setting means or the exhaust setting means, the combustion control data including the water inlet temperature and the hot water temperature of the can body, and the hot water amount correction signal in association with each other. The control means refers to the stored data, extracts data that is the same as or close to the current combustion control data, and controls the extracted data between the extracted data and the current combustion control data. By performing a predetermined calculation, a new hot water amount correction signal is generated and sent to the hot water amount adjusting means, and the generated hot water amount correction signal is updated and stored in association with the current combustion control data. it can.

According to this configuration, the amount of hot water is controlled by the generated hot water amount correction signal so that the hot water temperature approaches the target set temperature, so that the hot water temperature drops significantly with respect to the set temperature. There is no trouble, and usability is improved. Further, according to the configuration of the present invention, the generated hot water amount correction signal is updated and stored together with the combustion control data, and a new hot water amount correction signal is calculated and output based on the updated data. Accordingly, it is possible to make the learning so that the hot water amount correction signal converges to the optimum value according to the combustion control data,
Accurate control can be performed immediately. Further, by performing the learning, it becomes possible to perform the correction control that absorbs the variation inherent in the combustion device.

The tapping amount correction signal may be set to a value equal to or greater than a predetermined correction lower limit value. As described above, by adjusting the tapping amount by the tapping amount correction signal, the tapping temperature can be made closer to the set temperature, and the usability is improved. By the way, the correction range to be performed for the difference due to the installation state of the combustion device, the difference due to aging, and the difference caused by each product is within a certain range, and if a difference exceeding this range occurs, other than these, It is often caused by failures. According to the present invention, by providing the correction lower limit value, it is possible to perform appropriate correction only for the above-described items that should be corrected, and to prevent excessive correction for a difference due to a failure or the like.

In the present invention, the control means controls at least one of the preheating temperature of the vaporizer, the preheating time, the driving amount of the blower, and the driving time according to the setting of the exhaust setting means or the altitude setting means. Configuration.

As described above, even if the driving state (driving voltage) of the blower is the same, depending on the laying state of the exhaust pipe,
The amount of air supplied from the blower to the carburetor or the combustion section fluctuates. Similarly, even if the driving state of the blower is the same, the amount of blown air (the amount of oxygen) supplied to the vaporizer or the combustion section varies depending on the installation altitude of the combustion device. Also,
As the air concentration changes, the amount of heat dissipated from the vaporizer to the surroundings by the air flow also changes. That is, even in the same combustion control state, the supply air amount and the carburetor temperature fluctuate in accordance with the exhaust pipe laying state and the installation altitude of the combustion device, which hinders stable combustion.

According to the present invention, control is performed by changing at least one of the preheating temperature of the vaporizer, the preheating time, the driving amount and the driving time of the blower according to the setting of the exhaust setting means or the altitude setting means. This makes it possible to preheat the carburetor to an optimum temperature according to the laying state of the exhaust pipe and the installation altitude of the combustion device.

In the present invention, at least one of the exhaust setting means and the altitude setting means is switched by a switch, switched by a connector, switched by an input operation of a control panel connected to the combustion apparatus, or controlled. It is possible to adopt a configuration based on any of the switching settings by transferring data to the means.

According to the configuration in which the switch and the connector are provided, depending on the laying state of the exhaust pipe and the installation altitude of the combustion device,
By operating these switches or changing the connection of the connector, the switching can be easily set. Further, according to the configuration in which the switching is set by the input operation of the operation panel, the setting can be made at any time according to the installation location of the combustion device and the laying state of the exhaust pipe. Furthermore, according to the configuration for transferring data to the control means, for example, data set in advance by another data setting device (such as a dedicated data setting device or a personal computer) is transferred to the control device via a connection cable or the like. The setting operation can be reliably performed in a short time.

In the present invention, the combustion device has a headwind detecting means for detecting a headwind state in which air enters the combustion device from the exhaust side, and when the headwind state is detected by the headwind detecting means, , The control means includes a scavenging time,
A configuration in which the control value of at least one of the air supply amount and the fuel gas supply amount is changed to perform the abnormality avoidance control may be adopted.

When the wind enters the inside of the combustion device from the exhaust pipe due to the strong wind, a reverse wind state occurs in which the air flows backward from the combustion portion to the upstream side. When a headwind condition occurs, sufficient pre-scavenging cannot be performed and safe ignition cannot be performed, and furthermore, the flame at the time of ignition is fanned by the headwind and the ignitability is reduced. Also, if a headwind condition occurs during combustion, the flame is fueled and stable combustion is impaired. Further, the heat generated in the combustion section flows back to the upstream side, and the members arranged on the upstream side are heated, causing a problem that the members are damaged or durability is reduced.

However, according to the present invention, the abnormal wind avoidance control can be performed by the control means by detecting the backward wind by the backward wind detecting means, and the ignitability, stable combustion are maintained, and the durability is improved. As the reverse wind detecting means, for example, a wind pressure switch that switches contacts based on the force of the air flow received by the fins can be used, and this wind pressure switch is arranged downstream of the combustion unit to detect the generation of the reverse wind. Can be taken.

In the present invention, the combustion section has a flame hole base in which flame holes for emitting a flame are arranged in a plane, and the flame hole base has a flame hole base temperature sensor for detecting the temperature of the flame hole base itself. Is provided, and an air temperature sensor for detecting the temperature of the air supplied to the combustion device is provided, and the reverse wind detection means includes a flame hole base temperature sensor, an air temperature sensor, and control means, and the control means is The configuration is such that, while referring to the detected flame base temperature, the detected air temperature is determined to be in a backward wind state when the detected air temperature rises beyond a predetermined reverse wind determination temperature range according to the flame hole base temperature. Can

Since the air taken into the combustion device is taken in from the outside, the temperature of the air taken in usually does not become significantly higher than the outside air temperature (in a case where air is supplied from a room, the room temperature). However, when the headwind condition occurs, as described above, the air flows backward from the combustion part side to the upstream side, so that the heat on the combustion part side moves to the upstream side. As a result, the air temperature sensor provided near the outside air introduction portion fluctuates according to the temperature on the combustion portion side.

In the present invention, a headwind state is detected by utilizing this phenomenon that occurs at the time of headwind. That is, when the headwind condition occurs, the heat of the combustion part moves to the upstream side, and the temperature detected by the air temperature sensor increases. If this temperature rise width is determined in advance as a headwind discrimination temperature width in correspondence with the flame hole base temperature, the control means detects the temperature rise width of the air temperature sensor and the flame hole base temperature to determine the headwind state. can do.

For example, in a state in which no flame is generated, that is, in a preheated state of the vaporizer, the flame base temperature is low. Therefore, the temperature range of the headwind discrimination is set to a narrow temperature range according to the flame hole base temperature. Further, the temperature range for determining the reverse wind during combustion is set to a wide temperature range according to the flame hole base temperature.
According to this configuration, the control unit monitors the temperature increase width of the air temperature sensor by applying the reverse wind determination temperature width corresponding to the flame hole base temperature. Then, when the temperature rise width of the air temperature sensor is increased to be equal to or greater than the reverse wind determination temperature width, the air temperature sensor is determined to be in a reverse wind state and necessary abnormality avoidance control is performed.

When the headwind detecting means detects a headwind condition, the control means performs an abnormality avoiding control for increasing and correcting at least one of the supply air amount and the combustion amount by a predetermined value corresponding to the combustion amount at the time of the headwind detection. It can be carried out. In the case where a headwind is generated, that is, when air flows backward from the combustion part side to the upstream side, an ignition mistake is likely to occur, and the combustion state is likely to be unstable due to the flame being blown out or to blow out easily. However, according to this configuration, when a headwind condition is detected, the supply air amount is increased by the control means, and the airflow that is going from the combustion section side to the upstream due to the headwind is supplied downstream by the supply airflow. Press to prevent air movement to the upstream side.

Further, the fuel gas (mixed gas) supplied to the combustion section is fanned by the back wind, and the combustion tends to be unstable. However, it is also possible to stabilize combustion by increasing the amount of combustion. The correction amount of the supplied air amount and the combustion amount can be appropriately determined according to the combustion device, but can also be determined, for example, according to the combustion amount (the number of combustions) at the time when the headwind is detected.

The combustion apparatus of the present invention is of a downward combustion type in which the fuel gas generated in the vaporizing section or the mixed gas of the combustion gas and the air is supplied to the burning section and the flame is jetted downward. It is desirable to configure. The combustion device is often incorporated into equipment such as a water heater as an upper combustion type in which a flame is ejected upward or a lower combustion type in which a flame is ejected downward.

In the combustion apparatus of the lower combustion type, heat generated in the combustion section moves to the downstream heat exchange section by the air flow supplied from the upstream side. This makes it easier for heat to stay on the upstream side of the combustion section. Further, once the exhaust portion is provided so as to be bent from the combustion portion, the combustion portion and the exhaust passage can be arranged in parallel in the lateral direction. Thereby, there is an advantage that the height of the apparatus can be kept low as a whole, and the apparatus can be downsized. According to the present invention, the above-described present invention efficiently preheats the vaporizing section to improve the ignitability and the combustibility while improving the heat exchange rate by adopting the down-combustion type, and at the same time, damage the parts by heat. And a configuration with improved reliability can be achieved.

[0043]

Embodiments of the present invention will be described below with reference to the drawings. The present invention relates to a combustion apparatus 1 that vaporizes and burns liquid fuel, and has a feature that stable combustion is ensured by providing the combustion apparatus 1 with an exhaust setting unit, an altitude setting unit, and a headwind detection unit. Things. Therefore, before describing the details of the control, the overall configuration of the combustion device 1 will be described. In the following description, the upper and lower relations are based on a state where the combustion device is installed in a water heater or the like.

(Configuration and Operation of Combustion Apparatus) FIG. 1 is a front view showing a water heater incorporating a combustion apparatus 1 according to an embodiment of the present invention with a front panel removed, and FIG. , FIG. 3 is a perspective view showing a flame hole base employed in the combustion section, FIG. 4 is an enlarged perspective view of a mounting portion of a vaporizer temperature sensor, FIG. 5 is a perspective view showing a lower surface side of the flame hole base, and FIG. FIG. 7 is an enlarged perspective view showing a mounting portion of the flame hole base temperature sensor, FIG. 7 is a perspective view showing an air amount adjusting section, and FIG. 8 is a view centering on control means (control circuit section) for controlling the water heater 100 including the combustion device 1. 3 is a block diagram of a control system configured in FIG.

As shown in FIG. 1, the water heater 100 has a substantially rectangular box shape having left and right side plates 101a, 101a, a top cover 101b, a bottom plate 101c, and a back panel (not shown). A large number of components including a combustion device 1, a can body 102 for performing heat exchange, and an exhaust portion 103 are accommodated. Further, an exhaust unit 103 for discharging combustion gas (exhaust gas) discharged from the combustion device 1.
Is arranged so as to be folded back from the can body 102, and the water heater 1
No. 00 communicates with an exhaust pipe connecting portion 104 provided through the top cover 101b.

An exhaust pipe 105 is connected to the exhaust pipe connecting portion 104 to discharge exhaust gas generated in the combustion device 1 to the outside. On the other hand, an opening 22 (described later) provided in an upper part of the combustion device 1 communicates with an intake pipe connection part 106 provided through a central portion of the top cover 101b. The intake pipe connection portion 106 includes an intake pipe 107
Is connected, and external air is introduced into the combustion device 1.

Normally, the exhaust pipe 105 and the intake pipe 107 are laid in parallel, and an intake / exhaust adapter (wall top) 108 is attached to the tip of each pipe. The intake / exhaust adapter 108 has a double pipe structure having an outer pipe and an inner pipe,
The end of the exhaust pipe 105 is connected to the inner pipe, and the end of the intake pipe 107 is connected to the outer pipe. The exhaust gas is discharged to the outside through the inner pipe, and the external air is sucked through the outer pipe. The intake / exhaust adapter 108 has a heat exchange function of transferring the heat of the exhaust gas to the intake air, and improves the combustibility in cold weather by increasing the intake air temperature.

As can be seen from FIG. 1, the combustion apparatus 1 of the present embodiment is built in the water heater 100 with the flame hole directed downward, and is of a downward combustion type (a so-called reverse type in which a flame is ejected downward). Combustion type). As shown in FIG. 2, the combustion device 1 employed in the water heater 100 is configured such that a blower 2, a drive mechanical unit 3, an air amount adjustment unit 4, a mixing unit 5, and a combustion unit 6 are sequentially stacked from above. . A vaporizer 7 is provided in the vicinity of the mixing section 5 and the combustion section 6, and a flow path forming member 13 is provided between the air amount adjusting section 4 and the vaporizer 7 to form an air flow path. I have.

The blower 2 has a fan 21 rotatably disposed inside a concave housing 20 formed by bending a steel plate. An opening 22 is formed at the center of the housing 20. Is provided.

The drive mechanical section 3 has a box 10, and a motor 30 is attached to the center of the top plate 12. The rotating shafts 30a and 30b of the motor 30 project from both ends, and the rotating shafts 30a and 30b penetrate substantially the entire length of the combustion device 1 vertically. The upper rotating shaft 30 a of the motor 30 is connected to the fan 21, and the lower rotating shaft 30 b is connected to the rotating member 8 of the carburetor 7. That is, the rotation of the motor 30 drives the fan 21 to rotate and blow air (supply air) downward, and simultaneously rotates the rotation member 8.

The motor 30 of the blower 2 is driven by a control signal generated by a control circuit unit (control means) 5 fixed to the outer wall of the box 10, and the number of rotations of the motor 30 is controlled to the combustion unit 6. The supply air volume is controlled. In addition, fan 21
And an air temperature sensor 90 for detecting the temperature of the air sucked from the opening 22 by the blower 2 is fixed to the top plate 12 of the box 10. In this embodiment,
A thermistor is used for the air temperature sensor 90, and a detection signal is sent to the control circuit unit 5.

As shown in FIGS. 2 and 7, the air amount adjusting section 4 is composed of a disk-shaped moving side plate-shaped member 41 and a square fixed side plate-shaped member 42. The movable side plate member 41 is rotatably attached. The movable side plate-like member 41 has a disk shape, and is provided with a shaft insertion hole 41a at the center. This shaft insertion hole 41a
, 12 radially approximately triangular openings 41b
Are provided, and twelve substantially rectangular openings 41c are further outwardly provided.
Is provided. Further, the movable side plate-shaped member 41 is provided with an engaging portion 41d in which a part of a peripheral edge portion is vertically cut and raised.

The fixed-side plate member 42 has a square shape, and is larger than the movable-side plate member 41. A shaft insertion hole 42a is also provided in the center of the fixed-side plate member 42. Twelve substantially triangular openings 42b are radially provided around the shaft insertion hole 42a, and twelve substantially square openings 42c are further provided outside. Further, a support member 42d that supports the driving piece 43 in a swingable manner is fixed to the fixed-side plate-like member 42. One end of the driving piece 43 is
It is connected to the drive shaft 40a of the step motor 40 fixed to the outer wall of the box 10, and the other end is engaged with the engaging portion 41d of the movable plate member 41.

The movable-side plate member 41 includes the fixed-side plate member 4.
2 and is relatively rotatable about the center shaft insertion holes 41a and 42a. When the step motor 40 is driven, the drive piece 43 engaged with the drive shaft 40a is driven.
Swings and presses the engaging portion 41d of the movable side plate member 41 in the tangential direction. As a result, the moving-side plate member 41
Are relatively rotated on the fixed side plate member 42 around the central shaft insertion hole 41a.

That is, the air amount adjusting section 4 rotates the movable plate member 41 by the stepping motor 40 so that the opening 4 of the movable plate member 41 and the fixed plate member 42 is opened.
The degree of overlap between 1b and 42b and between openings 41c and 42c is changed. Thus, the air amount adjusting unit 4
Is to increase or decrease the opening area by changing the degree of overlap between the openings, and to adjust the amount of air moving up and down through the openings.

The opening amount of the air flow path from the blower 2 to the combustion unit 6 side is adjusted by the air amount adjustment unit 4 to control the supply amount of the air flow generated by the blower 2 to the combustion unit 6 side. ing. In the present embodiment, the primary air (air directly supplied to the vaporizer 7) and the secondary air (to the periphery of a flame hole of a flame hole base to be described later) are controlled by controlling the moving side plate-shaped member 41 in the air amount adjusting unit 4. (The supplied air) is optimally adjusted. The step motor 40 is driven by a control signal generated by the control circuit unit 5, and the air amount adjusting unit 4 is adjusted and controlled so as to obtain an optimal opening area according to the combustion state.

As shown in FIG. 2, the flow path forming member 13
It is made by bending a thin plate into a substantially conical shape, and the inside is hollow and communicates vertically. That is, the flow path forming member 13
It has an opening at the upper part and a lower part, and both are in communication. The upper opening is in contact with the center of the fixed side plate-shaped member 42, and the lower opening is connected to the primary air introduction cylinder 15 described later. ing.

A fuel pipe (fuel supply pipe) 14 is fixed inside the flow path forming member 13. Fuel pipe 14
Is attached through the opening at the upper part of the flow path forming member 13, penetrates the flow path forming member 13 and the primary air introduction tube 15, and reaches the inside of the rotating member 8 of the vaporizer 7.

The mixing section 5, the combustion section 6 and the vaporizer 7 are arranged as shown in FIG.
As shown in the figure, the flame hole base 60 is the center, and the vaporizer 7 is provided at the center of the flame hole base 60. These components are housed in the housing 11. As shown in FIG. 2, the flame hole base 60 is made of aluminum die-cast, and has a complicated framework, openings and grooves. In FIG. 3, the flame hole base 60 is used.
Is shown in a state in which an upper surface plate 65 is attached to the upper part of FIG.

As shown in FIGS. 3 and 4, the upper surface side of the flame hole base 60 mainly functions as a flow path forming surface for fuel gas and secondary air, and the lower surface side has a flame hole mounting surface as shown in FIG. Functions as a surface. That is, on the upper surface side of the flame hole base 60, there are provided grooves 63 partitioned by a large number of loop-shaped vertical walls 62, and a groove 64 is provided between adjacent vertical walls 62. I have. Then, the fuel gas generated by the vaporizer 7, which will be described later, blows out from the groove 64 to the lower flame hole through the space between the upper surface wall 61 and the vertical wall 62 to generate a flame.

As shown in FIG. 5, a large number of loop-shaped vertical walls 66 are provided on the lower surface side of the flame hole base 60.
A number of openings 67 are arranged in each loop partitioned by the vertical wall 66. The vertical wall 66 is a vertical wall 6 on the upper surface side.
2, and an opening 67 partitioned by a vertical wall 66 communicates with the groove 63 on the upper surface side to form a secondary air supply path.

In addition, between the adjacent vertical walls 66,
A groove 64 communicating from the upper surface side is provided. A flame hole member 68 is fixed between the adjacent vertical walls 66 so as to straddle the vertical walls 66. The flame hole member 68 has a substantially U-shaped cross section, and a large number of flame holes 68a are arranged in a zigzag pattern near both longitudinal side edges on the lower surface side. Then, the fuel gas (mixed gas) supplied through the groove 64
Is emitted from the flame hole 68a, and is ignited by the fuel gas to generate a flame.

In this embodiment, the height d of the flame hole member 68 is set to 2 mm. That is, when the flame hole member 68 is fixed to the flame hole base 60, the height from the surface of the flame hole base 60 to the flame hole 68a of the flame hole member 68 becomes 2 mm. According to this configuration, heat generated by the flame ejected from the flame hole 68 a can be efficiently transmitted to the flame hole base 60 through both side surfaces of the flame hole member 68. Further, since the area of both side surfaces of the flame hole member 68 is small, heat conducted on both side surfaces is less likely to be dissipated by the secondary air supplied to the downstream side through the opening 67. Thereby, a part of the heat generated by the flame is efficiently conducted to the flame hole base 60. By configuring the flame hole member 68 in this manner, heat corresponding to the state of the flame is transferred to the flame hole base temperature sensor 9 described later.
2 enables accurate detection and enables appropriate control.

As shown in FIG. 3, the flame hole base 60 employed in the combustion apparatus 1 of the present embodiment has a heat absorbing wall 60.
a, 60b, and 60c are provided. Heat absorbing wall 60a
Is provided in a wall shape downward along the outer edge of the flame hole base 60 so as to surround the group of flame holes 68a arranged in large numbers. The heat absorbing wall 60a has a function of absorbing a part of the heat generated by the flame ejected downward from the flame hole 68a and transmitting the heat to the flame hole base 60.

Further, the heat absorbing wall 60b is
Is provided in the vicinity of the vaporizer 7 provided in the center of the flame hole base 60 in the longitudinal direction of the flame hole base 60 so as to sandwich the vaporizer. The heat absorbing wall 60b is formed in a wall shape having a height approximately half of that of the heat absorbing wall 60a.
Is provided so as to shield the light.

The heat absorbing wall 60c is provided in the vicinity of the vaporizer 7 so as to sandwich the vaporizer 7 toward the short side of the flame hole base 60. The heat absorbing wall 60c is formed by arranging a plurality of dice-shaped protrusions having a height approximately half that of the heat absorbing wall 60a. These heat absorbing walls 60
b and 60c have a function of transmitting a part of the radiant heat of the flame to the flame hole base 60 while blocking conduction of the radiant heat to the vaporizer 7. By arranging the heat absorbing walls 60a, 60b, and 60c, heat corresponding to the state of the flame can be detected as the temperature of the flame hole base 60, and accurate control can be performed. These heat absorbing walls 60a, 60b, 60c are formed as a die cast integrally with the flame hole base 60 using a mold.

In this embodiment, as shown in FIGS. 2 and 3, two temperature sensors using a thermistor are attached to the flame hole base 60. One is a vaporizer temperature sensor 91 that detects the temperature of the vaporizer 7, and the other is a flame hole base temperature sensor 92 that detects the temperature of the flame hole base 60.

As shown in FIGS. 2 to 4, the vaporizer temperature sensor 91 includes a lead wire 91b extending from the thermistor TH.
A connector 91a is provided at an end of the thermistor TH, and a fixing plate 91c is attached to the thermistor TH. The vaporizer temperature sensor 91 is fixed so as to pierce the peripheral portion 72 of the vaporizer 7 from the upper surface side of the flame hole base 60. That is, a fitting hole 60d is provided through the flame hole base 60 toward the peripheral portion 72 of the vaporizer 7, and a screw hole 60e is provided near the fitting hole 60d. Then, the thermistor TH is inserted into the insertion hole 60d, and the screw N is screwed into the screw hole 60e through the fixing plate 92c to be tightened and fixed. By fixing the vaporizer temperature sensor 91 in this manner, the temperature of the peripheral portion 72 of the vaporizer 7 can be efficiently detected.

On the other hand, as shown in FIGS. 2, 3 and 6, the flame hole base temperature sensor 92 is located at the outer edge corner of the flame hole base 60 along the heat absorbing wall 60a, and the vaporizer 7 is interposed therebetween. And is mounted so as to face a part farthest from the vaporizer temperature sensor 91. With this arrangement, the physical distance between the flame hole base temperature sensor 92 and the vaporizer temperature sensor 91 is maximized. Thus, it is possible to accurately grasp the flame hole base temperature corresponding to the flame in a state where it is least affected by the temperature fluctuation of the vaporizer. The flame hole base temperature sensor 92 has the same configuration as the vaporizer temperature sensor 91 described above. That is, a connector 92a is provided at an end of a lead wire 92b extending from the thermistor TH, and a fixing plate 92c is attached to the thermistor TH. The thermistor TH is the same as the vaporizer temperature sensor 91.

The flame hole base temperature sensor 92 is fixed so as to pierce the heat absorbing wall 60 a of the flame hole base 60 from the upper surface of the upper surface plate 65. That is, the upper plate 65 has an opening 65.
a is provided, and a fitting hole 60f is also provided at a position corresponding to the heat absorbing wall 60a of the flame hole base 60. A screw hole 65b is provided near the opening 65a of the upper surface plate 65. Then, the thermistor TH is fitted into the fitting hole 60f through the opening 65a, and the screw N is screwed into the screw hole 65b through the fixing plate 92c to be tightened and fixed. By fixing the flame hole base temperature sensor 92 in this manner, it is possible to efficiently detect a temperature corresponding to the heat absorbed by the heat absorbing wall 60a.

In the present embodiment, the flame hole base temperature sensor 9
2 is a 3-pin type connector 92a, which is distinguished from the 2-pin type connector 91a of the vaporizer temperature sensor 91. This prevents incorrect insertion of the connector during manufacturing or maintenance. The connectors 92 a and 91 a of the flame hole base temperature sensor 92 and the vaporizer temperature sensor 91 are connected to the control circuit unit 5.

As shown in FIGS. 1 and 4, the vaporizer 7 includes a vaporizing chamber 70 and a rotating member 8. Vaporization chamber 70
Is a cylindrical body having a bottom part 71 and a peripheral part 72. The bottom part 71 is closed and the upper part is open. That is, the vaporization chamber 70
Has a concave shape, the bottom surface portion 71 and the peripheral portion 72 are closed and airtight and watertight, and the upper portion is open. The vaporization chamber 70 has the bottom portion 71 and the peripheral portion 72 as described above, and has a shape like a cup, and the flame hole base 60.
It is attached to the central part of.

A vaporizer heater 73 is built in the bottom 71 of the vaporization chamber 70. When the vaporizer heater 73 is energized, the bottom portion 71 generates heat, and this heat is conducted through the wall of the vaporization chamber 70, so that the inner wall of the vaporization chamber 70 is entirely heated. This has a function of easily evaporating the liquid fuel scattered into the vaporization chamber 70 by the rotating member 8.

The rotating member 8 is attached to the rotating shaft 30b of the motor 30 and rotates integrally therewith. The rotating member 8 has a shape in which the periphery of a disk is cut and raised to provide a number of stirring blades 8a. The rotating member 8 scatters liquid fuel supplied (dropped) through the fuel pipe 14 by centrifugal force due to rotation. The scattered fuel is vaporized by heat inside the vaporization chamber 70 to become a fuel gas. . Further, the rotating member 8 has a function of stirring the vaporized fuel gas and the primary air supplied from the blower 2 to generate a uniform mixed gas. That is, in order to efficiently vaporize the liquid fuel inside the vaporization chamber 70, the rotating member 8 scatters the liquid fuel (oil is used in the present embodiment) dropped from the fuel pipe 14 in the form of fine particles and scatters. The function is to stir the vaporized fuel gas and the primary air to mix them uniformly.

As shown in FIG. 8, the control circuit section 5 controls the water heater 100 including the combustion device 1 in accordance with combustion, and is constituted by a digital circuit using a CPU. As shown in FIG. 8, the control circuit unit 5 includes an exhaust setting unit 5.
0, altitude setting means 51, vaporizer heater control circuit 52, blower control circuit 53, combustion amount control circuit 54, and hot water amount adjustment means 56 are connected. In addition, a temperature sensor or the like for detecting the temperature of each part of the combustion device 1 and the water heater 100 is connected to the control circuit unit 5, and is configured to perform control according to a detection signal of the sensor.

More specifically, the exhaust setting means 50 comprises:
The switch 50a is constituted by a single-pole single-throw switch 50. When the switch 50a is closed, the scavenging extension is set.
Open to cancel the scavenging extension setting. In the present embodiment, the setting of the scavenging extension and the canceling of the setting are switched between a state where the total length of the exhaust pipe 105 is 3 m or a state where the number of bends is three and a state where the number of bending is three or more.

The altitude setting means 51 comprises two single pole single throw switches 51a and 51b.
The flat, semi-highland and highland are switched by the combination setting of b. That is, when the switches 51a and 51b are opened, the setting is switched to the flatland setting, when only the switch 51a is closed, it is switched to the semi-highland setting, and when only the switch 51b is closed, the setting is switched to the highland setting. Further, a data table created in advance by associating the settings by the exhaust setting unit 50 and the altitude setting unit 51 with the combustion control values (the driving amount and the combustion amount of the blower 2) is transmitted to a control unit (control circuit unit) 5 described later. Store and configure.

The carburetor heater control circuit 52 controls the energization of the carburetor heater 73, and the control circuit section 5 generates a control signal with reference to the detection signal of the carburetor temperature sensor 91 to generate the carburetor heater 73. It is sent to the control circuit 52. The blower control circuit 53 controls the drive of the blower 2.
The control circuit unit 5 generates a control signal with reference to the detection signal of the rotation speed detection sensor 53 a provided in the blower 2 and sends the control signal to the blower control circuit 53.

The combustion amount control circuit 54 controls the supply amount of the liquid fuel dropped to the carburetor 7 through the fuel pipe 14 according to the combustion amount. The damper control circuit (air amount adjusting unit control circuit) 55 controls the opening area of the air amount adjusting unit 4 and sends a control signal from the damper control circuit 55 to the step motor 40 to perform control. .

The tapping amount adjusting means 56 controls the opening and closing valve by a servomotor (not shown), and adjusts the tapping amount flowing out of the can 102. That is, the control circuit unit 5 includes the incoming water temperature sensor 5 supplied to the can 102.
Referring to the combustion control state including the detection signal of 6a and the tapping temperature sensor 56b, the servo motor is controlled so that the tapping temperature becomes the target temperature, and the tapping amount is adjusted and controlled. Hot water supply amount adjusting means 56 is provided at a lower central portion of water heater 100 as shown in FIG.

The control circuit 5 includes a CPU, a RAM, an RO,
An M / I / O port and an A / D conversion circuit for converting an analog sensor signal into a digital signal or a D / A conversion circuit for converting a generated digital control signal into an analog control signal; A control signal corresponding to the amount of combustion is generated by a program process while referring to the detection signal and the switching signal of the switch. Data necessary for combustion control is stored in the ROM in advance,
The necessary combustion control processing is performed by referring to the data at any time in U.

In the combustion device 1 of the present embodiment, as described above, the thermistor TH includes the air temperature sensor 90,
A vaporizer temperature sensor 91, a flame hole base temperature sensor 92, an incoming water temperature sensor 56a, and a hot water temperature sensor 56b are arranged. Then, the control circuit unit 5 captures the detection signal of the thermistor TH as a voltage fluctuation of 0 to 5 volts, and A / D converts the captured analog voltage, thereby generating a digital signal corresponding to the voltage and performing signal processing. Is going. Note that the A / D conversion circuit performs 8-bit processing, converts an analog voltage of 0 to 5 volts into 255, and converts and outputs corresponding digital data.

Here, in order to detect a change in the resistance value of the thermistor TH due to a change in temperature as a voltage, a voltage is normally applied to both ends of the thermistor TH and a resistor connected in series to detect the potential at the connection point. Is adopted. In this case, a configuration in which the thermistor TH is connected to the ground side and a positive voltage is applied to the resistor side, or conversely, a configuration in which a resistor is connected to the ground side and a positive voltage is applied to the thermistor side can be adopted. Although the present invention can be implemented with any voltage polarity, the present embodiment has a configuration in which the thermistor TH is connected to the ground side and a positive voltage is applied to the resistance side. Then, the connection point potential is sent to the control circuit unit 5 as a sensor detection signal.

As described above, the combustion apparatus 1 according to the present embodiment is provided with the exhaust setting means 50 and the altitude setting means 51, and the control circuit (control means) 5 optimizes scavenging control and combustion according to the settings. The control is performed. Further, a temperature sensor is provided in each section, and detection signals of these temperature sensors are transmitted to the control circuit section 5 to perform abnormality avoidance control.

The details of each control process will be described below in order. Note that these controls are performed in the process of executing a series of programs by the control circuit unit 5, and it is difficult to clearly divide each control. Therefore, in the description, portions necessary for each control process are extracted from a series of programs and described.

(First Embodiment: Scavenging Control of Blower) Referring to the flowcharts of FIGS. 1 to 8 and FIG. 9, scavenging control of the blower according to the first embodiment of the present invention will be described. In the present embodiment, the exhaust setting means 50 is switched and set on the basis of the case where the length of the exhaust pipe connected to the combustion device 1 is 3 m or the number of bent exhaust pipes is three. In other words, when it exceeds this, the switch 50a of the exhaust setting means 50 is closed to set the scavenging extension setting, and when less than this, the switch 50a is opened to cancel the scavenging extension. The control circuit unit 5 monitors switching settings of an operation switch (not shown) of the combustion device 1. When the operation switch is turned on, the control circuit unit 5 sends a control signal to the carburetor heater control circuit 52 to supply electricity to the carburetor heater 73 and start preheating (see steps 200 and 201 in FIG. 9).

The control circuit 5 includes a vaporizer temperature sensor 91
Preheating of the vaporizer 7 with reference to the detection signal, and when the temperature of the vaporizer 7 reaches 250 ° C. (preheating temperature), a control signal is sent to the blower control circuit 53 to sweep the blower 2 at the scavenging speed In the embodiment, the rotation drive is started at 3000 rpm). This starts scavenging of the unburned gas vaporized by the vaporizer 7 (see steps 201 to 203 in FIG. 9).

The control circuit 5 starts driving the blower 2 and, at the same time, refers to the switching state of the switch 50 a of the exhaust setting means 50. If the switch 50a is in the open state, the setting of the scavenging extension has been released, so that the blower 2 is continuously driven for 6 seconds, and then the notification signal is transmitted to the remote controller (not shown) connected to the combustion device 1. And notifies completion of preheating. On the other hand, if the switch 50a of the exhaust setting means 50 is in the closed state, the scavenging extension is set, so that the blower 2 is continuously driven for 10 seconds, and then a notification signal is sent to a remote controller (not shown) to perform preheating. Completion notification is performed (see steps 204 to 207 in FIG. 9).

After the completion of the preheating notification, the control circuit 5 enters a combustion command standby state. During the standby of the combustion command, the energization control is performed so that the carburetor 7 is maintained at the standby preheating temperature (about 230 ° C.), and the blower 2 is driven by standby air blowing control described later. Then, when the combustion command is transmitted during the standby of the combustion command, the control circuit unit 5 controls the energization of the carburetor 7 to about 250 ° C. and shifts to the combustion control including the ignition control (steps 208 to 208 in FIG. 9). 212).

The control circuit unit 5 repeatedly performs the combustion control and the combustion standby control in response to the transmission of the combustion command. When the off state of the operation switch is detected as an interruption, the process proceeds to step 213 and the operation is turned off. (Step 2 in FIG. 9)
08-212, 213).

As described above, according to the combustion apparatus 1 of the present embodiment, scavenging according to the laying state of the exhaust pipe can be performed only by switching and setting the exhaust setting means 50 according to the laying state of the exhaust pipe. it can. Thus, when the preheating is completed, the unburned gas remaining inside the exhaust pipe is completely exhausted, and stable ignition and combustion can be performed.

In this embodiment, the drive time of the blower 2 is changed to perform scavenging in accordance with the setting of the exhaust setting means 50. For example, the drive time of the blower 2 is fixed and the drive voltage is changed. It is also possible to change (driving force). Further, at the time when the preheating completion notification is performed in step 207 in FIG. 9, the pre-scavenging of the exhaust pipe 105 has been completed, but when performing the combustion control in step 210,
Furthermore, it is also possible to perform a pre-purge (pre-scavenging) for a predetermined time. In step 211 in FIG. 9, the energization control of the carburetor heater 73 is performed so as to maintain the carburetor 7 at the standby preheating temperature (approximately 230 ° C.) during combustion standby. In this control, for example, the upper limit temperature (235 ° C.) and the lower limit temperature (225 ° C.) are set above and below the standby preheating temperature, and while the vaporizer temperature sensor 91 is monitored by the control circuit unit 5, the vaporizer 7 Is reached, the energization of the vaporizer heater 73 is stopped, and conversely, when the temperature reaches the lower limit temperature, the energization is resumed.

(Standby Blowing Control of Blower in First Embodiment) Next, standby blowing control of the blower 2 executed in step 212 of the flowchart shown in FIG. 9 will be described with reference to FIG.
0, will be described with reference to the flowchart of FIG. Here, the standby blower control according to the present embodiment prevents the heat in the vicinity of the vaporizer 7 and the combustion unit 6 from moving to the upstream side and maintains the vicinity of the vaporizer 7 at the preheating temperature or the standby preheating temperature. Control. Step 2 in FIG.
FIG. 11 shows details of drive control of the blower 2 according to the air temperature shown in FIG.

The control circuit section 5 reads the detection signal of the air temperature sensor 90 when the standby air blowing control is started. When the intake air temperature is lower than 50 ° C., the heat of the combustion section 6 does not move to the upstream side. Then, it is determined that the temperatures of the vaporizer 7 and the flame hole base 60 are not significantly increased, and the driving of the blower 2 is stopped (see steps 220, 221, and 224 in FIG. 10).

On the other hand, when the intake air temperature is equal to or higher than 50 ° C., the control circuit unit 5 drives the blower 2 at 500 rpm and performs drive control according to the air temperature shown in FIG. 11 (steps 221 to 221 in FIG. 10). 223, FIG. 11). As shown in FIG. 11, the blower control is performed by changing the rotation speed of the blower 2 according to the intake air temperature when the current drive rotation speed of the blower is continued for one minute. For example, as shown in step 250 of FIG. 11, when the blower 2 continues 500 rpm for 1 minute and the air temperature is 20 ° C. or less, the rotation speed of the blower 2 is set to 300 rpm
pm, and if the air temperature is more than 20 ° C. and 56 ° C. or less, 500 rpm is maintained. Further, when the air temperature is 58
If the temperature is not less than 60 ° C. and not less than 900 ° C., increase to 900 rpm;
If the air temperature is 60 ° C. or higher, control is performed to increase the temperature to 1500 rpm.

This blower control is performed when the rotation speed of the blower 2 is 3
The same operation is performed when 00 rpm, 900 rpm, and 1500 rpm are maintained for one minute.
The control is performed so that the rotation speed becomes 5, 255, 260 (see steps 240 to 261 in FIG. 11).

When the control process of the blower according to the air temperature is completed, the control circuit section 5 determines whether or not the air temperature is 56 ° C. or more in step 225 of FIG. If the air temperature is equal to or higher than 56 ° C.,
11), the rotation speed of the motor is measured for one minute.
The rotation speed of the blower 2 set in the flowchart of (1) is maintained (see steps 225 and 228 in FIG. 10).

On the other hand, in step 225, the air temperature
When the temperature is lower than 0 ° C., the timer 2 (time for measuring the air temperature of 56 ° C. or less for 1 minute) is started, and it is monitored whether the state continues for 1 minute (FIG. 10, steps 225 to 227, 2).
29). When the state in which the air temperature is lower than 56 ° C. continues for one minute, the control circuit unit 5 determines that the temperatures of the combustion unit 6 and the carburetor 7 are low, and refers to the detection signal of the carburetor temperature sensor 91 to control the carburetor 7. Find the temperature. Then, the temperature of the vaporizer 7 becomes 100
If the temperature exceeds ℃, reset the clock 2. On the other hand, when the temperature of the vaporizer 7 is 100 ° C. or lower, the timer 3 (time for measuring the vaporizer temperature of 100 ° C. or lower for 15 minutes) is started, and the state of 100 ° C. or lower is continuously monitored for 15 minutes. (See steps 229 to 233 in FIG. 10).

When the state in which the temperature of the vaporizer 7 is 100 ° C. or less is resolved within 15 minutes, the timer 3 is reset.
On the other hand, if the state where the temperature of the vaporizer 7 is 100 ° C. or less continues for 15 minutes, the drive of the blower 2 is stopped to raise the temperatures of the combustion unit 6 and the vaporizer 7 and the timer 3 is reset (step in FIG. 10). 230-236).

As described above, in the standby air blowing control of this embodiment, the number of revolutions of the blower is controlled stepwise according to the air temperature, and the state in which the air temperature is lower than the predetermined value and the vaporizer 7 is lower than the predetermined temperature. If the continuation is continued, control for stopping the drive of the blower 2 is performed. This effectively prevents the heat in the vicinity of the combustion section 6 from moving to the upstream side, and the carburetor 7.
Further, it is possible to effectively maintain the combustion section 6 (flame hole base 60) at a predetermined preheating temperature or a standby preheating temperature.

(Second Embodiment: Combustion Control According to Exhaust Setting and Altitude Setting) Next, FIG. 1 to FIG. 8 and FIG.
The combustion control according to the second embodiment of the present invention will be described with reference to the flowchart of FIG. The combustion control according to the present embodiment controls the amount of combustion (number) and the amount of air to be blown according to the settings of the exhaust setting unit 50 and the altitude setting unit 51 so as to obtain optimal combustion.

The ROM of the control circuit unit 5 stores a data table in which the switching setting of the exhaust setting unit 50 and the altitude setting unit 51 and the amount of combustion and the amount of blown air are associated in advance. This data table is provided individually according to the maximum combustion capacity of the combustion device 1 (in the present embodiment, classified into a high combustion type with a maximum combustion amount of 25.5 and a low combustion type with a maximum combustion amount of 21). I have. Further, it is assumed that the ROM stores in advance a combustion capability flag for distinguishing whether the combustion device 1 is of the high combustion type or the low combustion type.

Further, in the present embodiment, the altitude setting means 51 is configured to set the low altitude at an altitude of less than 500 m, the semi-altitude at an altitude of 500 m to less than 1000 m, and the altitude of an altitude of 1000 m to less than 1500 m. On the other hand, similarly to the first embodiment, the exhaust setting means 50 sets the exhaust pipe to have a total length of 3 m or the number of bends as a guide. Make settings to cancel.

When the energization of the water heater 100 (connection of the power outlet) is started, the control circuit unit 5 discriminates between the high combustion type and the low combustion type with reference to the combustion capacity flag stored in the ROM. If the result of determination is that it is a high combustion type, step 2
The routine proceeds to 72, and if it is a low combustion type, the flow branches to step 283 (see steps 270 to 272, 283 in FIG. 12).

The combustion apparatus 1 is of a high combustion type (maximum combustion amount 2
5.5), the control circuit unit 5 is provided with the altitude setting means 51.
With reference to the setting state of the exhaust setting unit 50, the maximum combustion amount (No. 25.5) is restricted according to the setting, and the setting is made to increase the blowing amount.

That is, the switch 51 of the altitude setting means 51
If both a and 51b are in the open state and the switch 50a of the exhaust setting means 50 is in the open state, the setting of the scavenging extension has been canceled in the lowland setting, so that the maximum combustion amount is 25.5.
The normal combustion control is performed using the air volume and air volume as standard. Similarly, when the scavenging extension is set in the lowland setting, the maximum combustion amount is reduced to 24.7, and the blowing amount is increased by 5% (steps 272, 276, 280 to 282 in FIG. 12).
reference). In addition, when the setting of scavenging extension is canceled in the semi-altitude setting, the maximum combustion amount is reduced to 24.4,
When the blowing rate is increased by 6% and the scavenging extension is set in the semi-highland setting, the maximum burning rate is reduced to No. 23 and the blowing rate is increased to 11% (FIG. 12, steps 272 and 276).
279).

Further, when the setting of the scavenging extension is canceled at the high altitude setting, the maximum combustion amount is reduced to 22.8, the blowing amount is increased by 12%, and the scavenging extension is set at the high altitude setting. Sometimes, while reducing the maximum combustion amount to No. 21,
The amount of air is increased to 17% (steps 272-2 in FIG. 12).
75).

On the other hand, when it is determined in step 271 that the combustion apparatus 1 is of the low combustion type (maximum combustion amount No. 21), the control circuit section 5 similarly refers to the setting states of the altitude setting means 51 and the exhaust setting means 50. Then, according to the setting, a setting is made to increase the blowing amount while maintaining the maximum combustion amount (No. 21).

That is, when the setting of the scavenging extension is canceled in the lowland setting, the blowing amount is set to the standard, and when the scavenging extension is set in the lowland setting, the blowing amount is increased by 5% (FIG. 12). Steps 283, 287, 291-293). In addition, when the setting of the scavenging extension is canceled in the semi-highland setting, the blowing amount is increased by 6%, and when the scavenging extension is set in the semi-highland setting, the blowing amount is increased by 11% (FIG. 12). Steps 283, 287-290). Further, when the setting of the scavenging extension is canceled in the high altitude setting, the blowing amount is increased by 12%, and when the scavenging extension is set in the high altitude setting, the blowing amount is increased by 17% (FIG. 12, step 283). 286).

The control circuit unit 5 stores the read maximum combustion amount and the correction value of the blowing amount in the RAM, and in the subsequent combustion control, refers to the data stored in the RAM to limit the maximum combustion amount. Perform control.

As described above, according to the combustion control of the present embodiment, the optimum setting can be achieved only by switching and setting the exhaust setting means 50 and the altitude setting means 51 in accordance with the exhaust pipe laying state and the installation altitude of the combustion apparatus 1. Combustion control in which the amount of combustion or the amount of air blow is automatically corrected so as to maintain the combustion state is performed. Thereby, the degree of freedom of installation of the combustion device can be significantly improved by a simple setting.

In the combustion control according to the present embodiment, the maximum combustion amount and the air blowing amount at the time of maximum combustion are corrected in accordance with the exhaust setting and the altitude setting. It is not limited. For example, by preparing in advance a data table in which the total combustion amount (number) including the exhaust setting and the altitude setting and the maximum combustion amount and the blowing amount are prepared, it is possible to perform more detailed combustion control according to the setting. It is. Further, when the combustion amount exceeds a predetermined value, it is also possible to adopt a configuration in which a data table in which the exhaust setting and the altitude setting are associated with the combustion amount (number) and the blowing amount is prepared.

Further, the combustion apparatus 1 of this embodiment is provided with the blower 2 having a blowing capacity capable of coping with the high combustion type (maximum combustion amount 25.5) even with the low combustion type (maximum combustion amount 21). ing. As a result, in the low combustion type, it is possible to perform combustion control in which the amount of air blow is increased and corrected without reducing the amount of combustion. However, in order to suppress noise caused by an increase in the air flow, it is also possible to perform control to suppress an increase in the air flow while reducing and correcting the combustion amount.

Here, according to the combustion control of this embodiment,
A combustion state in which the amount of combustion is limited according to the exhaust setting and the altitude setting occurs. Along with such a limitation of the amount of combustion, the temperature of the tap water flowing out of the can 102 decreases. Therefore, in the control according to the present embodiment, control for stabilizing the tapping temperature is performed by performing tapping amount adjustment control in step 296 of FIG.

(Hot water amount adjustment control in the second embodiment)
Hereinafter, the hot water supply amount adjustment control performed by the hot water supply amount adjusting means 56 in step 296 of FIG. 12 will be described. In the present embodiment, a case where only hot water is supplied by the water heater 100, a case where hot water is supplied and a bath is dropped at the same time, and a case where automatic heat retention and water replenishment are performed will be described. still,
In Expressions 1 to 7, C is a constant, and in this embodiment, the constant C is set to 25.

(When hot water supply temperature is 60 ° C. or less and hot water supply is used alone) The control circuit unit 5 refers to the RAM, reads the target set temperature set on the operation panel (not shown), and enters the water input temperature sensor 56a. The incoming water temperature is determined by the detection signal of Further, the maximum combustion amount according to the settings of the exhaust setting means 50 and the altitude setting means 51 is read with reference to the ROM. By substituting these data into Equation 1, the target tapping flow rate is calculated.

[0117]

(Equation 1)

The control circuit section 5 generates a control signal corresponding to the target hot water flow rate calculated by the equation 1, and sends the control signal to the hot water flow rate adjusting means 56 to control the hot water flow rate. That is, the target hot water flow rate is calculated using the fact that the hot water flow rate from the can body 102 is proportional to the maximum combustion quantity and is inversely proportional to the difference between the set temperature and the incoming water temperature. When calculating the target tapping flow rate in Equation 1,
In order to improve the usability of the water heater, a correction value (−α ° C.) is included to slightly increase the amount of hot water.

(When hot water supply set temperature exceeds 60 ° C. and hot water supply is used alone) The control circuit unit 5
The inlet water temperature and the outlet water temperature are obtained from the detection signals from the sensor 6a and the outlet temperature sensor 56b. In addition, hot water amount adjusting means 56
The present tapping flow rate is obtained with reference to the control signal of (1). By substituting these data into Equation 2, the current output number is calculated.

[0120]

(Equation 2)

Next, the control circuit unit 5 reads the stored previous learning number with reference to the RAM. Then, these data are substituted into Equation 3 to calculate the number of learning issues.

[0122]

(Equation 3)

Further, the control circuit section 5 reads the target set temperature set on the operation panel (not shown) and obtains the incoming water temperature based on the detection signal of the incoming water temperature sensor 56a. By substituting these data into Equation 4, the target tapping flow rate is calculated.

[0124]

(Equation 4)

The control circuit section 5 generates a control signal corresponding to the target hot water flow rate calculated by the equation 4 and sends the control signal to the hot water flow rate adjusting means 56 to control the hot water flow rate. That is, in Equation 3, the required number of combustions (the amount of combustion) in the combustion control state is determined by correcting and adding the half of the difference between the previous learning number and the current output number to the current output number. Learning is performed so as to converge to the number of learning issues.

(When the hot water supply and the bath are dropped simultaneously, or when only the bath is stopped after the simultaneous use,
When the hot water supply set temperature is 60 ° C. or less)
With reference to M, the target set temperature and the required number of baths set on the operation panel (not shown) are read, and the incoming water temperature is determined by the detection signal of the incoming water temperature sensor 56a.
Further, the maximum combustion amount according to the settings of the exhaust setting means 50 and the altitude setting means 51 is read with reference to the ROM. By substituting these data into Equation 5, the target tapping flow rate is calculated.

[0127]

(Equation 5)

The control circuit section 5 generates a control signal corresponding to the target hot water flow rate calculated by the equation 5, and sends the control signal to the hot water flow rate adjusting means 56 to control the hot water flow rate.

(When the hot water supply and the bath are dropped simultaneously, or when only the bath is stopped after the simultaneous use,
When the hot water supply set temperature exceeds 60 ° C.)
The incoming water temperature and the outgoing water temperature are obtained from the detection signals of the incoming water temperature sensor 56a and the outgoing water temperature sensor 56b. Further, the current tapping flow rate is obtained with reference to the control signal of tapping amount adjusting means 56. Substituting these data into Equation 2 above, the current output number is calculated.

[0130]

(Equation 6)

Next, the control circuit section 5 reads the stored previous learning number with reference to the RAM. Then, these data are substituted into Equation 3 to calculate the current learning number.

[0132]

(Equation 7)

Further, the control circuit section 5 reads the target set temperature and the required number of baths set on the operation panel (not shown) and obtains the incoming water temperature based on the detection signal of the incoming water temperature sensor 56a. By substituting these data into Equation 6, the target tapping flow rate is calculated.

[0134]

(Equation 8)

The control circuit section 5 generates a control signal corresponding to the target hot water flow rate calculated by the equation 6 and sends the control signal to the hot water flow rate adjusting means 56 to control the hot water flow rate.

(At the time of automatic warming or water replenishment and when the hot water supply set temperature is 60 ° C. or less) The control circuit unit 5 reads the target set temperature set on the operation panel (not shown) with reference to the RAM, and Then, the incoming water temperature is obtained from the detection signal of the incoming water temperature sensor 56a. Also, referring to the ROM,
The maximum combustion amount according to the settings of the exhaust setting means 50 and the altitude setting means 51 is read. By substituting these data into Equation 7, the target tapping flow rate is calculated.

[0137]

(Equation 9)

The control circuit section 5 generates a control signal corresponding to the target hot water flow rate calculated by the equation 7 and sends it to the hot water flow rate adjusting means 56 to control the hot water flow rate. In the calculation of the target tapping flow rate in Equation 7, a correction (+ β ° C.) for slightly setting the tapping temperature is performed.

As described above, according to the hot water supply amount adjustment control of the present embodiment, even when the amount of combustion is restricted by the exhaust setting or the altitude setting, the correction combustion control for bringing the hot water temperature close to the target set temperature is performed. Thereby, the tapping temperature is prevented from being remarkably deviated from the set temperature, and the usability is improved.

In the hot water supply amount adjustment control of the present embodiment, since the hot water temperature approaches the set temperature, there is a case where the hot water amount is significantly restricted and the usability is impaired. Therefore, the lower limit of the learning number (learning combustion amount) calculated by Expression 3 according to the setting of the exhaust setting unit 50 or the altitude setting unit is limited. That is, a low combustion type (maximum combustion amount 21
No.), the lower limit of the learning number is set to 18. Further, in the combustion apparatus of the high combustion type (maximum combustion amount 25.5), the lower limit of the number of learning numbers is set separately according to the exhaust setting and the altitude setting. That is, the lower limit is set to No. 22 in the lowland / scavenging extension cancellation setting, and the lower limit is set to 20.7 in the lowland / scavenging extension setting or semi-altitude / scavenging extension cancellation setting.
No. The lower limit is set to 19.6 in the semi-altitude / scavenging extension setting or the high altitude / scavenging extension cancel setting, and the lower limit is set to 18.5 in the high altitude / scavenging extension setting. This prevents a significant drop in the amount of hot water. The reason for setting the lower limit is as follows. That is,
Differences due to combustion equipment installation status, differences due to aging,
The correction range to be performed for the difference caused by other products is within a certain range. If a difference exceeding this range occurs, it often results from a failure other than these. Therefore, a lower limit value of the correction is provided so as to prevent an excessive correction for the difference due to a failure or the like and to perform correction only for an item to be corrected.

Incidentally, the exhaust pipe 10 of the combustion device 1 is usually
5 is laid so as to extend outdoors. For this reason, when the wind is strong, a reverse wind state occurs in which the wind enters the inside of the combustion device 1 through the exhaust pipe 105, and stable combustion is impaired. Therefore, the details of the abnormality avoidance control performed to ensure stable combustion even when a headwind occurs will be described below. In the following description, the combustion amount refers to the combustion amount corrected according to the settings of the exhaust setting unit 50 and the altitude setting unit 51. Similarly, when performing the blower control according to the combustion amount, the exhaust setting means 50 and the altitude setting means 51
Means the control of the blower corrected according to the setting of.

(Third Embodiment: Abnormality Avoidance Control When Backwind Occurs) Referring to the flowcharts of FIGS. 1 to 8 and FIGS. 13 to 15 and the graph of FIG.
Abnormality avoidance control at the time of occurrence of a reverse wind will be described. Incidentally, the reverse wind detection processing in FIG. 13 (steps 303 and 306).
FIG. 14A shows the details of FIG. 14A, and FIG. 14B shows the details of the backward wind release state determination processing (step 308) in FIG.
Is shown in FIG. 15A shows details of the abnormality avoidance control process (step 307) in FIG.
FIG. 15B shows the details of the steady control process (step 309) in FIG.

In the present embodiment, the flame hole base temperature sensor 9
2 and the detection signal of the air temperature sensor 90 to the control circuit 5
The headwind state is detected by determining in the above. That is, headwind discrimination temperature width data corresponding to the temperature of the flame hole base 60 is stored in advance in the ROM of the control circuit unit 5 as a data table. When the combustion device 1 is in a preheated state before ignition, the flame hole base temperature is very low. Therefore, when a headwind condition occurs, the temperature of the air temperature sensor 90 increases by a small width due to the heat of the carburetor 7 and the flame hole base 60. Is detected. On the other hand, if a headwind condition occurs during combustion, the air temperature sensor 90
Has a large value. By storing such a flame hole base temperature and a headwind discrimination temperature width in the ROM of the control circuit unit 5 in advance, the headhole temperature is detected to determine the headwind state.

Further, in the present embodiment, the control mode of the blower 2 and the air amount adjusting section (damper) 4 is changed between the steady state and the time when a headwind is generated. That is, in the steady state, FIG.
As shown in (a), the damper 4 is fully closed (combustion amount 3 to 10) and opened middle (combustion amount 10 to 18) according to the combustion amount.
No.) and fully open (burning amount No. 18-No. 26). The rotation speed of the blower 2 is 1800 to 500
Control is performed in the range of 0 rpm, and when the opening degree of the damper 4 is switched, the rotation speed of the blower 2 is discontinuously controlled in order to adjust the supply air amount to the target amount.

On the other hand, when a headwind is generated, control is performed to increase the amount of combustion as compared to the steady state and to increase the rotation speed of the blower 2 and the opening of the damper. That is, FIG.
As shown in FIG. 6 (b), the damper 4 is moved to the position A (combustion amount 8 to 14) and the position B (combustion amount 14 to 2) according to the combustion amount.
No. 0) and fully open (burning amount No. 20 to No. 26). Further, the rotation speed of the blower 2 is controlled in a range of 2500 to 5000 rpm higher than the steady state, and when the opening degree of the damper 4 is switched, the rotation speed of the blower 2 is discontinuously adjusted to adjust the supply air amount to the target amount. Is controlled. Here, the damper positions A and B are defined as fully closed <damper position A <middle open <
The opening degree satisfies the condition of damper position B <full opening.

In the following, abnormality avoidance control when a headwind is generated will be described. When the operation switch of the combustion device 1 is switched to the ON setting, the control circuit unit 5 performs a pre-heat treatment of the vaporizer 7 and waits for a combustion command when the pre-heating is completed (step 3 in FIG. 13).
00-302).

Upon receiving the combustion command, the control circuit unit 5 detects a reverse wind state in step 303. If the reverse wind is detected, the control circuit unit 5 controls the combustion amount to 8 and the damper position A to perform ignition control. On the other hand, if it is in a steady state, the combustion amount is 6,
The ignition control is performed by controlling the damper to be fully closed.

That is, in the steady state, the damper is fully closed to suppress the air flow to improve the ignitability, and in the reverse wind state, the damper is slightly opened (position A), and the air flow from the blower 2 and the reverse wind The ignitability is ensured by increasing the amount of combustion while canceling the airflow due to the airflow (steps 302 to 30 in FIG. 13).
5). Here, the detection (determination) of the headwind state in step 303 is performed in steps 303a to 303 in FIG.
This is performed according to the procedure shown in FIG. That is, the control circuit unit 5 detects the flame hole base temperature and obtains a head wind discrimination temperature width corresponding to the detected flame hole base temperature with reference to the ROM. And
The control circuit unit 5 monitors the detection signal of the air temperature sensor 90, and determines that the airflow is in the reverse wind state when the air temperature rises beyond the reverse wind determination temperature range.

The control circuit unit 5 determines again the state of the reverse wind after the ignition. If it is in the headwind detection state, abnormality avoidance control according to the combustion amount is performed. In the present embodiment, in the headwind detection state, if the combustion amount is 8 or less, ON / OFF control for obtaining the required combustion amount on average by repeating the combustion and stopping the combustion is performed.

In the headwind detection state, the combustion amount is 8
If the number exceeds 14 and the number is 14 or less, the blower control is performed at the damper position A in accordance with the amount of combustion (number). Perform blower control. When the combustion amount becomes 20 or more, the blower control according to the combustion amount (number) is performed when the damper is fully opened. While the control based on the headwind detection state is being performed, the control circuit unit 5 performs steps 307 and 3.
The process of step 08 is repeated to monitor the headwind release state (see steps 306 to 308 in FIG. 13 and FIG. 15A).

On the other hand, when a steady state is detected in step 306 after ignition, or when the headwind release state is determined in step 308 while control accompanying the headwind detection state is being performed, the routine proceeds to step 306. move on. Then, after the reverse wind detection is performed again, the process shifts to the steady control.

In the steady state, when the combustion amount is 10 or less,
When the damper is fully closed, the blower control according to the combustion amount (number) is performed. When the combustion amount exceeds 10 and less than 18, the blower control according to the combustion amount is performed with the damper open. In addition, the combustion amount is 18
When the damper is greater than or equal to the number, the blower control is performed in accordance with the combustion amount (number) when the damper is fully opened. Even while the control in the steady state is being performed, the control circuit unit 5 performs the control processing in steps 306 and 309. Is repeated to monitor the occurrence of a backwind condition, and when a backwind is detected, the process immediately proceeds to step 307 (step 3 in FIG. 13).
06, 309, see FIG. 15 (b)).

As described above, when a headwind is generated, stable combustion is achieved by increasing the amount of combustion and the amount of supplied air (the rotational speed of the blower 2 and the opening of the damper 4) (abnormality avoidance control) as compared with the steady state. We are trying to secure.

In the abnormality avoiding control of the present embodiment, scavenging control when a headwind is generated is not particularly described. However, when the headwind is detected, the abnormality avoiding control such as increasing the scavenging time or the rotation speed of the blower may be performed. it can. For example, a headwind detection process is added to the scavenging control shown in FIG. 9, and when a headwind state is detected, compared to the steady state,
It is also possible to perform scavenging control in which the number of rotations of the blower 2 is increased and the scavenging time is increased.

Also, in the present embodiment, an example has been described in which the backwind detecting means is constituted by the flame hole base temperature sensor 92, the air temperature sensor 90 and the control circuit 5, but the present invention is limited to such a structure. It is not something that can be done. For example, it is also possible to adopt a configuration in which a headwind state is detected by a wind pressure switch (not shown) provided on the downstream side of the combustion part 6 of the combustion device 1 as the headwind detection means.

Further, in the present embodiment, the state of canceling the reverse wind is determined by referring to the operation switch, the stop of combustion or the rotation speed of the blower 2. However, the present invention is not limited to such a configuration. For example, it is also possible to detect a case where the amount of combustion exceeds a predetermined value or a case where the current supplied to the blower becomes equal to or less than a predetermined value to determine the reverse wind release state. Further, in the configuration provided with the wind pressure switch, the reverse wind can be released in response to the non-backwind state detection signal of the wind pressure switch. Further, in a configuration in which a flame sensor (a frame rod or the like) for detecting a flame state is provided in the combustion unit 6, it is possible to determine that the headwind is released by detecting that the detection signal of the flame sensor has entered a predetermined fluctuation range. It is.

[0157]

According to the combustion apparatus of the first aspect, scavenging control can be performed so as to completely scavenge unburned gas according to the laying state of the exhaust pipe, and stable ignition and combustion can be achieved. Can be done. According to the combustion device of the second aspect, it is possible to perform the corrected combustion control according to the laying state of the exhaust pipe, and it is possible to improve the combustibility. According to the combustion device of the third aspect, it is possible to perform the corrected combustion control according to the installation altitude of the combustion device, and it is possible to improve the combustibility. According to the combustion device of the fourth aspect, it is possible to perform the corrected combustion control according to the laying state of the exhaust pipe and the installation altitude of the combustion device, and it is possible to improve the combustibility. Claim 5
According to the combustion device described in the above, it is possible to perform complete scavenging control according to the laying state of the exhaust pipe, and to perform corrected combustion control according to the laying state of the exhaust pipe and the installation altitude of the combustion device. , Ignitability and flammability can be improved. According to the sixth aspect of the present invention, the tapping temperature can be brought close to the set temperature, and the usability is improved. According to the seventh aspect of the present invention, by learning the control of the hot water supply amount, it is possible to absorb variations inherent in the combustion apparatus and to perform accurate hot water supply amount adjustment control. According to the present invention as set forth in claim 8, it is possible to effectively correct the fluctuation of the tapping temperature caused by the installation state and the secular change of the combustion device, or the difference between the combustion devices, by distinguishing from the failure and the like, The reliability of the device can be improved. According to the ninth aspect of the present invention, the carburetor can be optimally preheated according to the installation state of the combustion device, and the ignitability and the combustibility can be improved. According to the tenth aspect of the present invention, it is possible to perform the switching setting according to the installation state of the combustion device with a simple configuration. According to the eleventh and twelfth aspects of the present invention, stable combustion can be maintained by the abnormality avoidance control even when a headwind condition occurs.

[Brief description of the drawings]

FIG. 1 is a front view showing a water heater incorporating a combustion device according to an embodiment of the present invention with a front panel removed.

FIG. 2 is a sectional view of the combustion device according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a flame hole base employed in the combustion apparatus shown in FIG. 2;

FIG. 4 shows a carburetor employed in the combustion apparatus shown in FIG. 2;
FIG. 3 is a perspective view showing a state in which a vaporizer temperature sensor is attached.

FIG. 5 is a partially enlarged view showing a lower surface side of the flame hole base shown in FIG. 3;

FIG. 6 is a perspective view showing an attached state of a flame hole base temperature sensor.

FIG. 7 is a perspective view showing an air amount adjusting unit employed in the combustion device shown in FIG. 2;

FIG. 8 is a block diagram showing a main part of a control system of the combustion device shown in FIG.

FIG. 9 is a flowchart illustrating scavenging control according to the first embodiment of the present invention.

FIG. 10 is a flowchart showing standby air blowing control in the first embodiment shown in FIG.

11 is a flowchart showing the blower control in the standby blower control shown in FIG.

FIG. 12 is a flowchart illustrating combustion control according to a second embodiment of the present invention.

FIG. 13 is a flowchart illustrating abnormality avoidance control when a headwind is generated according to a third embodiment of the present invention.

14A is a flowchart illustrating a headwind detection process in FIG. 13; FIG. 14B is a flowchart illustrating a headwind release state determination process in FIG. 13;

15 (a) is a flowchart showing the abnormality avoiding control in FIG. 13, and FIG. 15 (b) is a flowchart showing the steady control in FIG.

16A is a graph showing a control state of the air amount adjusting unit in the steady control in FIG. 13, and FIG. 16B is a graph showing a control state of the air amount adjusting unit in the abnormality avoidance control in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Combustion apparatus 2 Blower 5 Control means 6 Combustion part 7 Vaporizer 50 Exhaust setting means 51 Altitude setting means 56 Hot water supply amount adjusting means 60 Flame hole base 73 Vaporizer heater 91 Vaporizer temperature sensor 92 Flame hole base temperature sensor 90 Air temperature sensor 102 Can body 105 Exhaust pipe

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kimiaki Asano 93 Edo-cho, Chuo-ku, Kobe, Hyogo Pref. (72) Inventor Hiroaki Tanaka 93 Edo-cho, Chuo-ku, Kobe, Hyogo Prefecture Inside Noritz Co., Ltd. Person Giritari Kanda 93 Edo-cho, Chuo-ku, Kobe City, Hyogo Prefecture F-term in Noritz Corporation 3K003 FA01 FB04 FB05 FC04 FC06 GA04 RA01 RA09 SB01 SB03 SC04 SC06 SC09 3K052 AB11 AB12 AB14 AC03

Claims (12)

[Claims] 1. A combustion system comprising a vaporizer for vaporizing a liquid fuel to generate a fuel gas, and delivering the generated fuel gas or a mixed gas of air and fuel gas supplied from a blower to a combustion unit for combustion. In the apparatus, exhaust setting means switched and set according to the length or laying state of an exhaust pipe connected to the combustion apparatus, a vaporizer heater for heating a vaporizer, and a vaporizer temperature for detecting a temperature of the vaporizer. A sensor and control means for controlling supply of air and fuel gas, wherein the control means controls the exhaust setting means after the vaporizer temperature reaches a predetermined temperature during the preheating control of the vaporizer heater. A combustion device characterized in that a blower is driven in accordance with the setting of (1) to scavenge unburned gas remaining inside the combustion device to the outside through an exhaust pipe, and thereafter, preheating is completed. 2. A liquid fuel is vaporized to produce a fuel gas,
In a combustion device in which generated fuel gas or a mixed gas of air and fuel gas is sent to a combustion section and burned, exhaust settings are switched and set according to the length or laying state of an exhaust pipe connected to the combustion device. Means, and control means for controlling supply of air and fuel gas, wherein the control means corrects the exhaust gas to at least one of the air supply amount and the fuel gas supply amount in accordance with the setting of the exhaust setting means. A combustion control unit that performs combustion control based on the corrected control value subjected to the control. 3. A fuel gas is produced by vaporizing a liquid fuel,
An altitude setting means that switches and sets the generated fuel gas or a mixed gas of air and fuel gas to the combustion section and burns the combustion gas according to the installation altitude of the combustion apparatus, and a supply control of the air and the fuel gas. Control means for performing combustion based on a correction control value obtained by performing altitude correction on at least one of the air supply amount and the fuel gas supply amount according to the setting of the altitude setting means. A combustion device characterized by performing control. 4. A fuel gas is produced by vaporizing a liquid fuel,
Exhaust setting means that is switched and set in accordance with the length or laying state of an exhaust pipe connected to a combustion device in a combustion device that sends out the generated fuel gas or a mixed gas of air and fuel gas to a combustion section and burns it. And altitude setting means switched and set according to the installation altitude of the combustion device,
Control means for controlling the supply of air and fuel gas, wherein the control means controls at least one of an air supply amount and a fuel gas supply amount according to the settings of the exhaust setting means and the altitude setting means. A combustion control unit that performs a combustion control based on a correction control value obtained by performing an exhaust gas correction and an altitude correction on the fuel cell. 5. A combustion device comprising a vaporizer for vaporizing a liquid fuel to generate a fuel gas, and delivering the generated fuel gas or a mixed gas of air and fuel gas supplied from a blower to a combustion unit for combustion. In the device, exhaust setting means switched and set according to the length or laying state of the exhaust pipe connected to the combustion device, altitude setting means switched and set according to the installation altitude of the combustion device,
A vaporizer heater for heating the vaporizer, a vaporizer temperature sensor for detecting the temperature of the vaporizer, and control means for controlling the supply of air and fuel gas, the control means of the vaporizer heater After the carburetor temperature reaches a predetermined temperature during the preheating control, the blower is driven according to the setting of the exhaust setting means, and the unburned gas remaining inside the combustion device is scavenged to the outside through an exhaust pipe. While performing preheating control to complete preheating later, a correction control value obtained by performing an exhaust correction and an altitude correction on at least one of the air supply amount or the fuel gas supply amount according to the settings of the exhaust setting unit and the altitude setting unit. Combustion device for performing combustion control based on 6. A can body for exchanging heat generated in the combustion section with internal passing water or internally stored water, an incoming water temperature sensor for detecting an incoming water temperature flowing into the can body, and a hot water flowing out of the can body. A tapping temperature sensor for detecting a temperature, and tapping amount adjusting means for adjusting the tapping amount of the can body, wherein the control means corrects exhaust gas according to the setting of the exhaust setting means or the altitude setting means. Alternatively, in order to make the tapping temperature by the combustion control subjected to the altitude correction close to the target set temperature, a tapping amount correction signal corresponding to the inlet water temperature and tapping temperature is sent to the tapping amount adjusting means, and the tapping amount correction control is performed. The combustion apparatus according to any one of claims 1 to 5, wherein the combustion is performed. 7. The control means associates a set value of the altitude setting means or the exhaust setting means, combustion control data including an inlet water temperature and an outlet water temperature of the can body with the hot water amount correction signal. The control means refers to the stored data to extract data that is the same as or close to the current combustion control data, and compares the extracted data with the current combustion control data. A new hot water amount correction signal is generated by performing a predetermined calculation in between and sent to the hot water amount adjusting means, and the generated hot water amount correction signal is updated and stored in correspondence with the current combustion control data. The combustion device according to claim 6, characterized in that: 8. The combustion apparatus according to claim 6, wherein the hot water amount correction signal is set to a value equal to or greater than a predetermined correction lower limit value. 9. The control unit changes at least one of a preheating temperature, a preheating time, a driving amount and a driving time of the blower of the vaporizer according to a setting of the exhaust setting unit or the altitude setting unit. The combustion device according to any one of claims 1 to 8, wherein the combustion device is controlled. 10. At least one of the exhaust setting means and the altitude setting means is a switch setting by a switch, a switch setting by a connector connection, a switch setting by an input operation of an operation panel connected to a combustion device, or the control. The combustion apparatus according to any one of claims 1 to 9, wherein the combustion apparatus is configured by any one of switch settings by transferring data to the means. 11. The combustion device has a headwind detecting means for detecting a headwind state in which air enters the inside of the combustion device from the exhaust side, and when the headwind state is detected by the headwind detection means, the control means performs the control. Means are scavenging control by a blower,
The combustion device according to any one of claims 1 to 10, wherein the abnormality avoidance control is performed by changing at least one of a control value of an air supply amount and a fuel gas supply amount. 12. The combustion part has a flame hole base in which flame holes for ejecting a flame are arranged in a plane, and the flame hole base is provided with a flame hole base temperature sensor for detecting the temperature of the flame hole base itself. An air temperature sensor for detecting the temperature of the air supplied to the combustion device, wherein the headwind detecting means is constituted by the flame hole base temperature sensor, the air temperature sensor, and the control means; The means refers to the detected flame hole base temperature, and determines that a head wind state is detected when the detected air temperature rises beyond a predetermined head wind determination temperature width according to the flame hole base temperature. The combustion device according to claim 11, characterized in that: