JP2001090943A - Combustion abnormality detecting device and combustion device employing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a combustion abnormality detecting device, capable of detecting the occurrence of flooding through a CO sensor mounted normally on a bath hot-water supplier or the like, and a combustion device equipped with the combustion abnormality detecting device. SOLUTION: An existence of abnormality deciding means 111 decides the occurrence of combustion abnormality based on the present value of carbon monoxide concentration detected by a CO sensor 25 while a cause of abnormality deciding means 112 decides the cause of combustion abnormality based on the pattern of changing of the concentration of carbon monoxide in exhaust gas in accordance with the elapse of time. Materially, when the concentration of carbon monoxide is raised slowly, the slow increase of the pressure loss of supplying air or exhaust gas during a long period of time, such as the clogging of fins for a heat exchanger, is decided as the cause of the abnormality and when the concentration of carbon monoxide is increased within a short period of time and the value is fluctuated largely within a short period of several seconds, the cause of the combustion abnormality is decided as strong wind while the cause is decided as flooding when the concentration of carbon monoxide is raised within a short period of time and the value of the concentration of carbon monoxide is not fluctuated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for detecting abnormal combustion in a combustion section.

[0002]

2. Description of the Related Art A bath water heater installed in a bathroom is usually formed as a thin vertical type, and is installed immediately beside a bathtub. The floor of the place where the bathtub is installed is usually one step lower than the floor of the washing room in the bathroom so that the water flowing out from the drain of the post-installation type bathtub does not flow toward the washing room. Further, a bathroom drain port for draining water to the outside is provided on the floor surface of the bathtub where the bathtub has been lowered.

When a large amount of hot water is drained from a bathtub or a large amount of hot water is used in a washing place such as a shower, water that exceeds the drainage capacity of a bathroom drain port flows into a dropping bathtub arrangement where the water is lowered by one step. Water accumulates in the water. In particular, if trash is clogged in the bathroom drain, water easily accumulates in the bathtub arrangement location.

By the way, in a bath water heater installed in a bathroom, a burner portion is usually arranged near the bottom surface.
If a large amount of water accumulates at the place where the bathtub is placed due to clogging of trash in the bathroom drain, the burner will be flooded. Therefore, the conventional bath water heater uses a mechanical mechanism such as a float switch or a water level sensor to detect the presence or absence of flooding, or a bimetal is provided further below the burner to detect the presence of flooding, If there was a flood, combustion was stopped to ensure safety.

On the other hand, in order to prevent accidents due to incomplete combustion, etc., the bath water heater is usually equipped with a CO sensor for detecting the concentration of carbon monoxide in the exhaust gas. In conventional bath water heaters, based on the concentration of carbon monoxide currently detected by this CO sensor, fin clogging and poor ventilation of the heat exchanger are detected to reduce the amount of combustion or supply combustion air. When the combustion state is controlled by increasing the amount, or when the concentration of carbon monoxide exceeds the upper limit, the combustion is stopped or an abnormality is displayed.

[0006]

In a conventional bath water heater, a dedicated sensor and a mechanical part are provided for detecting flooding, so that the apparatus becomes large as much as the installation space is required. However, there has been a problem that the structure becomes complicated, which leads to a rise in the price of the device.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems of the prior art, and has a combustion abnormality detecting device capable of detecting the presence or absence of submergence using a CO sensor normally mounted on a bath water heater or the like. And a combustion device provided with the same.

[0008]

The gist of the present invention to achieve the above object lies in the following inventions. [1] In a combustion abnormality detecting device for detecting abnormal combustion in a combustion section (22), a sensor (25) for detecting a concentration of carbon monoxide in exhaust gas discharged from the combustion section (22) and a sensor for detecting a cause of the abnormal combustion. An abnormality cause determining means (112) for determining whether the concentration of carbon monoxide detected by the sensor (25) has changed over time. A combustion abnormality detecting device for determining the cause of the combustion abnormality based on the identification result.

[2] In a combustion abnormality detecting device for detecting abnormal combustion in the combustion section (22), a sensor (2) for detecting the concentration of carbon monoxide in the exhaust gas discharged from the combustion section (22).
5), abnormality presence / absence determination means (111) for determining the presence / absence of combustion abnormality, and abnormality cause determination means (112) for determining the cause of the combustion abnormality.
1) is the sensor (2) during the combustion of the combustion section (22).
5) comparing the detected carbon monoxide concentration with a predetermined reference value to determine whether or not the combustion state of the combustion section (22) is abnormal. The abnormality cause determination means (112)
Identifying in what pattern the carbon monoxide concentration detected by the sensor (25) has changed over time;
A combustion abnormality detection device for determining the cause of a combustion abnormality based on the identification result.

[3] Abnormal cause determination means (112)
Is a device for determining the cause of abnormal combustion based on the rate of increase in the concentration of carbon monoxide, wherein the abnormal combustion detection device according to [1] or [2] is characterized.

[4] The abnormality cause determining means (112)
Is to determine the cause of the combustion abnormality based on whether or not the concentration of carbon monoxide fluctuates within a certain fluctuation range or more, wherein the combustion abnormality detection according to [1] or [2] is performed. apparatus.

[5] The abnormality cause determining means (112)
Is to determine the cause of abnormal combustion based on the rate of increase of the concentration of carbon monoxide and whether or not the concentration of carbon monoxide fluctuates over a certain range [1].
Or the combustion abnormality detection device according to [2].

[6] The abnormality cause determining means (112)
Is characterized in that when the concentration of carbon monoxide fluctuates within a certain range or more, it is determined that the cause of the abnormal combustion is a strong wind, [1], [2], [4] or [5]. The combustion abnormality detection device according to the above.

[7] In the combustion abnormality detecting device, the combustion unit (22) is attached to a combustion device arranged near the bottom of the appliance main body. When the rate of increase of the carbon oxide concentration is equal to or higher than a certain value, it is determined that the cause of the abnormal combustion is either strong wind or the submergence of the burning part (22) immersed in water [1], [2]. The abnormal combustion detection device according to [3], [5] or [6].

[8] An apparatus for detecting abnormal combustion in a combustion section (22), wherein the combustion section (22) is attached to a combustion apparatus disposed near a bottom of an appliance body. A sensor (25) for detecting the concentration of carbon monoxide in the exhaust gas discharged from the combustion section (22) and a history of the concentration of carbon monoxide detected by the sensor (25) during combustion of the combustion section (22) are stored. History storage means (151)
Abnormality determination means (111) for determining whether or not the combustion state of the combustion section (22) is abnormal, and abnormality cause determination means (112) for determining the cause of the combustion abnormality.
The abnormality presence / absence determining means (111) is provided for the combustion part (2).
During the combustion of 2), the concentration of carbon monoxide detected by the sensor (25) is compared with a predetermined reference value, and the combustion unit (22) is compared.
The abnormal cause determining means (112) determines the cause of the abnormal combustion by one of the submergence in which the combustion part (22) is immersed in water and the strong wind. A primary determination means (113) for roughly classifying a first type and a second type caused by something other than these, and a secondary determination means (114) for finely classifying the first type of cause into submergence and strong wind. The primary determination means (113) is configured to store the contents of the history storage means (151) when the abnormality presence / absence determination means (111) determines that the combustion state of the combustion section (22) is abnormal. It is checked whether or not the concentration of carbon monoxide in the exhaust gas is increasing at a constant rate or more, and if it is increasing at a constant rate or more, the cause of the current combustion abnormality is identified as the first. Judged as a species and did not increase at a certain rate of increase Can has been made to determine the cause of this abnormal combustion and the second kind, the secondary determining means (11
4) When the primary determination means (113) determines that the cause of the combustion abnormality is the first type, the concentration of carbon monoxide detected by the sensor (25) fluctuates in a fluctuation range of a certain value or more. In the case of fluctuating over a certain range, the cause of the current combustion abnormality is determined to be a strong wind.If it does not fluctuate within a certain range, the cause of the current combustion abnormality is determined. A combustion abnormality detection device for determining that a flood has occurred.

[9] [1], [2], [3], [4],
In a combustion device provided with the combustion abnormality detection device according to [5], [6], [7] or [8], when a combustion abnormality is detected, the combustion unit is thereafter operated until a predetermined release condition is satisfied. Abnormality handling means (1) for stopping combustion in (22)
15), wherein the abnormality handling means (115) changes the cancellation condition in accordance with the cause of the combustion abnormality indicated by the result of the determination by the abnormality cause determining means (112). apparatus.

The present invention operates as follows. The abnormality cause determination means (112) identifies the pattern in which the concentration of carbon monoxide in the exhaust gas detected by the sensor (25) has changed with the passage of time, and based on the identification result, determines whether the combustion abnormality has occurred. Determine the cause. That is, conventionally, CO
The sensor (25) compares the present concentration of carbon monoxide with a predetermined reference value to detect the presence or absence of combustion abnormality,
Although only the current value of the carbon monoxide concentration was used for feedback control of the air ratio, in the present invention, the abnormal combustion was determined based on the change pattern of the carbon monoxide concentration over time. The cause has been determined. More specifically, the sudden rise in carbon monoxide concentration
It is determined whether the rise is gradual, whether the carbon monoxide concentration is repeatedly pulsating in a short cycle, or whether it is stable, and the like, and the cause of the abnormal combustion is determined based on the result of the determination.

For example, when the concentration of carbon monoxide is gradually increasing, the pressure loss of the supply and exhaust gas gradually increases over a long period of time, such as clogging of the fins of the heat exchanger and contamination of the exhaust pipe. Is considered to be the cause of abnormal combustion. On the other hand, if the carbon monoxide concentration increases in a relatively short time,
It can be determined that flooding or strong wind is the cause of abnormal combustion.
Further, when the concentration of carbon monoxide increases in a short time and its value fluctuates with a large fluctuation width in a short cycle of several seconds, it can be estimated that the strong wind causes the combustion abnormality.

As described above, the concentration of carbon monoxide is detected using the normally equipped CO sensor (25), and a change pattern is identified from the rate of increase and the fluctuation range of the concentration of carbon monoxide. Since the cause of the combustion abnormality is determined by clogging of the fins, flooding, strong wind, etc., it is not necessary to separately provide a dedicated sensor (25) or the like for each cause of the combustion abnormality, and the configuration of the apparatus can be simplified.

The abnormality judging means (111) compares the concentration of carbon monoxide detected by the CO sensor (25) during combustion of the combustion section (22) with a predetermined reference value to determine whether the combustion section (2) has the abnormality.
It is determined whether the combustion state of 2) is abnormal. Thus C
If the presence or absence of a combustion abnormality is determined based on the detection value of the O sensor (25), the cause may be determined only when there is an abnormality, and the processing efficiency can be improved.

More specifically, the cause of the combustion abnormality is determined as follows. The history storage means (151)
The history of the concentration of carbon monoxide detected by the CO sensor (25) during the combustion of the combustion section (22) is stored. The abnormality presence / absence determining means (111) compares the concentration of carbon monoxide detected by the CO sensor (25) during the combustion of the combustion section (22) with a predetermined reference value to determine whether the combustion state of the combustion section (22) is abnormal. It is determined whether or not.

The abnormality cause determining means (112) determines the cause of the combustion abnormality as a first type, which is one of a submergence or a strong wind in which the combustion part (22) is immersed in water, and a second type, which is caused by other than these. A primary determination means (113) roughly divided into:
A secondary determination means (114) for subdividing the cause of the abnormality into submergence and strong wind is provided.

The primary determination means (113) includes a history storage means (1) when the abnormality presence / absence determination means (111) determines that the combustion state of the combustion section (22) is abnormal.
It is checked whether or not the concentration of carbon monoxide in the exhaust gas is increasing at a certain rate or more with reference to the stored contents of 51). If the rate of increase is higher than a certain rate, the cause of the current combustion abnormality is determined to be the first type, and if the rate of increase is not higher than the certain rate, the cause is determined to be the second type.

When the primary determination means (113) determines that the cause of the combustion abnormality is the first type, the secondary determination means (114) determines that the concentration of carbon monoxide detected by the CO sensor (25) is constant. It is checked whether or not it fluctuates within the above fluctuation range. The secondary determination means (114) determines that the cause of the current combustion abnormality is a strong wind when the carbon monoxide concentration fluctuates in a fluctuation range of a certain value or more, and determines that it is not fluctuated in a fluctuation range of a certain value or more. The cause of the abnormal combustion is determined to be flooding.

In a combustion device such as a bath water heater provided with the above-described combustion abnormality detection device, when a combustion abnormality is detected, the combustion unit (2) is thereafter operated until a predetermined release condition is satisfied.
An abnormality countermeasure (115) for stopping the combustion in 2) is provided. The abnormality countermeasure unit (115) changes the cancellation condition according to the cause of the combustion abnormality indicated by the determination result of the abnormality cause determination unit (112). For example, in the case of a strong wind, the error is released by stopping the flow of water, and in the case of a flood, the error is not released unless the operation switch is once turned off.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Each drawing shows an embodiment of the present invention. The combustion abnormality detection device 111 according to the present invention,
The single-can multi-channel water heater 10 as a combustion device equipped with 112, 150, and 25 has a function of supplying hot water to a faucet, a shower, and a bathtub, and a function of reheating hot water in the bathtub. It is. One can multi-channel type bath water heater 10
This is a FF (forced supply / exhaust) type bath water heater installed in the bathroom, and a bathtub arrangement location 202 which is one step lower (more than ten centimeters) than the bathroom washroom 201 as shown in FIGS.
Is installed together with the bathtub 203. FIG. 3 shows a state in which the side plate of the single-can multi-channel type water heater 10 is removed, and illustrates the inside of the single-can multi-channel water heater 10 in a simplified manner.

At a predetermined position of the bathtub arrangement location 202, a bathroom drain port 204 for arranging water in the bathtub arrangement location 202 outside is buried. The washing place 201 is slightly inclined toward the side of the bathtub arrangement location, and water or hot water used on the washing place side flows into the bathtub arrangement place 202, and from the bathroom drain 204 buried in the bottom surface to the outside. Drained to Further, the water discharged from the drain port 205 of the bathtub 203 once flows down to the bathtub disposition location 202 and is then discharged to the outside from the bathroom drain port 204.

An exhaust pipe (not shown in FIG. 3) is connected to an exhaust pipe connecting portion 11 arranged on the upper surface of the single-can multi-channel type water heater 10. Exhausted outside the bathroom. In addition, an air supply cylinder (not shown in FIG. 3) connected to the outside of the bathroom is connected to the air supply cylinder connection portion 12, so that air necessary for combustion is taken in from the outside of the bathroom.

As shown in FIG. 4, the single-can multi-channel water heater 10 includes a combustion chamber 21, and a burner 22 as a combustion section is provided below the combustion chamber 21.
A heat exchanger 23 for transmitting heat from the burner 22 to water supply or the like is disposed at an upper portion of the heat exchanger 23. Above the heat exchanger 23, a suction-type combustion fan 24 is arranged.
In the middle of the exhaust passage downstream of the combustion fan 24, a CO sensor 2 for detecting the concentration of carbon monoxide contained in the exhaust gas is provided.
5 are arranged.

By rotating the combustion fan 24, the air in the combustion chamber 21 is discharged out of the bathroom through the exhaust pipe. As a result, the inside of the combustion chamber 21 becomes a negative pressure, and outside air flows into the combustion chamber 21 from the supply port 21 a at the lowermost part of the combustion chamber 21 through the supply cylinder and the supply cylinder connection portion 12. . Air supply port 21a and bathtub arrangement location 202
The distance to the floor is about 10 cm and the washing area 201
Is slightly smaller than the head of the bathtub arrangement location 202.

An igniter 26 (see FIG. 1) not shown in FIG. 4 is provided near the burner 22. Further, the presence or absence of the supply of the combustion gas to the burner 22, the switching of the combustion surface of the supply destination, and the adjustment of the supply amount are controlled by the original gas solenoid valve
7. This is performed by the switching solenoid valve 28 and the proportional valve 29.

The heat exchanger 23 has both a hot water supply channel 40 as a water pipe for hot water supply and a reheating channel 50 for circulating water in the bathtub for reheating.
Transfers heat from the burner 22 to both of the flow paths 40, 5
It is a so-called one-can-two-water-channel type with a function of transmitting heat to zero.

The hot water supply flow path 40 includes a hot water supply heat receiving pipe 40a which receives heat in the heat exchanger 23, a water supply flow path 41 communicating with an inlet side of the hot water supply heat receiving pipe 40a, and a hot water supply extending from an outlet side of the hot water supply heat receiving pipe 40a. And a flow path 42. The water inlet channel 41 and the hot water outlet channel 42 are connected by a fixed bypass 43 near the heat exchanger 23. Fixed bypass 4
Reference numeral 3 plays a role of directly flowing a part of the supply water flowing from the water inlet flow path 41 to the hot water discharge path 42 bypassing the heat exchanger 23, and the bypass ratio is fixed at a constant value.

A predetermined branching point 44 in the water inlet passage 41 that is farther from the heat exchanger 23 than the fixed bypass passage 43, and a heat exchanger 2 in the hot water passage 42 that is farther than the fixed bypass passage 43.
A predetermined merging point 45 remote from 3 is connected by a bypass passage 46 provided with a bypass water amount control valve 32 in the middle thereof. The fixed bypass 4
Between the branch point to 3 and the branch point 44 to the bypass passage 46, there is provided a water amount sensor 33 for detecting the presence or absence of water flow in the hot water supply flow path 40 and the amount of water flow. The junction of the hot water discharge passage 42 with the fixed bypass passage 43 and the bypass passage 46
A water flow control valve 31 that opens and closes to control the flow of water is provided between the water flow control valve 31 and the junction point 45.

A hot water supply confirming water amount sensor 34 for detecting the presence or absence of hot water is provided at a predetermined location downstream of the junction 45 in the hot water flow path 42. The hot water flow path 42 branches further downstream than the hot water supply confirmation water amount sensor 34, and the hot water tap 1
3 and the shower head 14 and the like through a shower hose. By changing the opening of the water amount control valve 31 and the bypass water amount control valve 32, the maximum discharge amount from the hot water tap 13 and the shower head 14 and the mixing ratio between the water heated by the heat exchanger 23 and the water supply are adjusted. It has become.

A water-supply thermistor 61 for detecting the water supply temperature is located slightly upstream (water supply source) from the branching point 44 in the water supply flow path 41, and a hot-water supply heat receiving pipe 40 in the hot water supply flow path 42.
A heat exchange outlet thermistor 62 for detecting the water temperature of the portion is disposed in the vicinity of the outlet side of a. Further, a water tapping thermistor 63 for detecting the water temperature after the supply of water from the bypass passage 46 has been mounted slightly downstream of the junction 45.

The reheating channel 50 connects between the bath heat receiving tube 50a, which is a portion that receives heat in the heat exchanger 23, the suction / discharge port 206 provided on the side wall of the bathtub 203, and the inlet side of the bath heat receiving tube 50a. It is composed of a bath return flow passage 51 and a bath outgoing flow passage 52 connecting between the outlet side of the bath heat receiving tube 50a and the suction / discharge port 206. In the middle of the bath return channel 51, the circulation pump 7
1 and a reheating water switch 72 for detecting the presence or absence of water flow in the bath return flow path 51. Further, a bath thermistor 73 for detecting the temperature of hot water flowing from the bathtub 203 is attached near the reheating water switch 72.

A predetermined position between the circulation pump 71 and the inlet of the bath heat receiving tube 50a in the bath return flow channel 51 and a position between the hot water supply thermistor 63 and the hot water supply confirmation water amount sensor 34 in the hot water flow channel 42. A predetermined location is connected by a pouring connection pipe 54 provided with a pouring solenoid valve 74 in the middle.
In the middle of the pouring connection pipe 54, in addition to several check valves 75,
An overpressure relief valve 76 is arranged in parallel with the pouring solenoid valve 74. By opening the pouring solenoid valve 74, it is possible to flow the hot water heated by the heat exchanger 23 through the hot water supply heat receiving pipe 40 a into the reheating channel 50 and pouring the hot water into the bathtub 203. Except for the pouring operation, the pouring solenoid valve 74 is kept closed.

In addition, a single-can multi-channel water heater 10
Has an electrical board 100 equipped with electrical components for controlling the operation of the appliance. Further, a remote controller 160 for remotely controlling the operation state of the appliance is connected.

FIG. 1 shows a circuit configuration of a one-can multi-channel water heater 10. One-can multi-channel water heater 1
The electrical board 100 included in the device 0 includes a CPU (central processing unit) 110 which plays a central role in various controls. C
Various circuit devices are connected to the PU 110 via a data bus, an address bus, and the like.

The ROM (Read Only Memory) 120 is a read-only memory for storing programs executed by the CPU 110 and various fixed data. RAM (random access memory) 130
This is a working memory for storing data that is temporarily needed to execute a program. Non-volatile RAM1
Reference numeral 50 denotes a rewritable memory that does not lose its stored contents even when the power of the appliance is turned off. Non-volatile RAM 150
Functions as a history storage unit 151 that stores a history of changes in the concentration of carbon monoxide in exhaust gas detected by the CO sensor 25. The timer section 140 has a function of measuring an elapsed time during combustion and the like.

Various peripheral components are connected to the CPU 110 of the electrical board 100 through an input / output interface circuit and a driver circuit (not shown). In particular,
Various gas solenoid valves 27 to 29, igniter 26, combustion fan 24, CO sensor 25, water amount sensor 33, hot water supply confirmation water amount sensor 34, water amount control valve 31, bypass water amount control valve 3
2. Reheating water switch 72, circulation pump 71, pouring solenoid valve 74, reheating water switch 72, bath thermistor 73, input water thermistor 61, heat exchange outlet thermistor 6.
2. Hot water thermistor 63 and the like. CPU 110
Is connected to a remote controller 160 having a function of receiving various operations and displaying a driving state and the like.

The remote controller 160 has an operation switch 162 for switching the operation state between the operation state and the rest state.
And an operation unit 161 provided with a hot water temperature setting switch and the like, not shown, and a display unit 165 for displaying an operation state such as a set temperature at the present time and whether the battery is being kept warm or being reheated. The display unit 165 also has a function as an error display unit 166 that displays the occurrence of a combustion abnormality and the details thereof.

The CPU 110 includes a combustion control means (not shown) for controlling various operations such as hot water supply, pouring and reheating, an abnormality presence / absence determination means 111 for determining the presence / absence of abnormality in the combustion state, The function as the combustion cause determining means 112 for determining the cause and the abnormality coping means 115 is performed. These functions are realized by executing a program stored in the ROM 120.

The abnormality presence / absence determining means 111 is provided by the CO sensor 2
5 determines the presence or absence of abnormal combustion based on the current concentration of carbon monoxide in the exhaust gas detected. The combustion cause determining means 112 has a function of a primary determining means 113 for roughly classifying the cause of the combustion abnormality into two types, and a function of a secondary determining means 114 for further subdividing one of the types roughly classified by the primary determining means 113 into two types. Fulfill.

The primary judging means 113 determines the cause of the combustion abnormality as a first type caused by one of submergence or strong wind in which the air supply port 21a in the lower part of the combustion chamber 21 is immersed in water, and the other types. It performs a function roughly classified into the second kind that is the cause. The second type is a type of abnormality in which the pressure loss of the supply / exhaust gradually increases over a long period of time, such as clogging of the fins of the heat exchanger 23 and dirt inside the exhaust pipe.

FIG. 5 shows the characteristic of increasing the carbon monoxide concentration when fin clogging is caused by abnormal combustion.
FIG. 6 shows the characteristic of increasing the carbon monoxide concentration when flooding is the cause of the combustion abnormality, and FIG. 7 shows the characteristic of changing the carbon monoxide concentration when strong wind is the cause of the combustion abnormality. . The vertical axis of each graph is the concentration of carbon monoxide, and the horizontal axis is the combustion time.

As shown in FIG. 5, when clogging of fins or the like is a cause of abnormal combustion, the concentration of carbon monoxide gradually rises relatively slowly over a long period of time. On the other hand, in the case of flooding or strong wind, the concentration of carbon monoxide increases in a relatively short time as shown in FIGS. When the strong wind is the cause of the abnormal combustion, the concentration of carbon monoxide repeatedly increases and decreases with a relatively large fluctuation width in response to the fluctuation of the wind intensity. On the other hand, when the flooding is the cause of the combustion abnormality, the carbon monoxide concentration increases monotonically and does not fluctuate with a large fluctuation width.

Based on these, the primary judgment means 113
When the abnormality presence / absence determination unit 111 determines that there is a combustion abnormality, it refers to the storage content of the history storage unit 151 to determine whether the concentration of carbon monoxide in the exhaust gas is increasing at a constant rate or more. If the rate of increase is more than a certain rate, the cause of the abnormal combustion is determined to be the first type (flood or strong wind). If the rate of increase is not more than a certain rate, the cause of the abnormal combustion is determined. The cause is determined to be the second type (fin clogging or the like).

When the primary determination means 113 determines that the cause of the abnormal combustion is the first type (flood or strong wind), the secondary determination means 114 increases the carbon monoxide concentration detected by the CO sensor 25 to several tens of degrees. It is monitored over a period of seconds to determine whether the concentration of carbon monoxide fluctuates within a certain range. If it fluctuates within a certain fluctuation range, the cause of the current combustion abnormality is determined to be a strong wind, and if it does not fluctuate within a certain fluctuation range, the cause of the current combustion abnormality is determined to be flooding. It has the function to do.

The abnormality countermeasure means 115 has a function of stopping the combustion of the supply cylinder connecting portion 12 after the abnormality is detected by the abnormality presence / absence determining means 111 until a predetermined release condition is satisfied. In addition, abnormality handling means 115
Is configured to switch the previous release condition according to the cause of the combustion abnormality indicated by the result of determination by the combustion cause determination means 112.

For example, when there is a strong wind, there is no problem even if the combustion is resumed as soon as the wind stops, so the user closes the tap once, and the water amount sensor 33 and the hot water supply confirmation water amount sensor 34
When is turned off, clear the error. In the case of flooding, it is necessary to take measures such as cleaning around the drain of the bathroom. Therefore, the combustion stop state is maintained until the operation switch of the appliance is once turned off. Therefore, once the operation switch 162 is turned off and then the operation switch 162 is turned on, the error is released.

If the cause of the combustion abnormality is the second type, the clogged fins of the heat exchanger 23 are cleaned,
Since it is necessary to take measures such as exchanging the heat exchanger 23 itself, the error is reset by pressing a reset switch (not shown) provided on the electrical board 100 by a service person or the like who has completed repairs. Has become. In the present embodiment, the abnormality presence / absence determination unit 111, the combustion cause determination unit 112, the nonvolatile RAM 150, and the CO sensor 25 correspond to a combustion abnormality detection device.

Next, the operation will be described. FIG. 8 shows a flow of an operation for detecting a combustion abnormality or the like. The CO sensor 25 constantly measures the concentration of carbon monoxide while the gas is being burned by the burner 22 by any of hot water supply, hot water supply, and reheating. Then, in the normal state, the measured value is stored in the history storage unit 151, for example, every minute (step S801). Here, data of the past four hours from the present time is stored in the history storage means 151 by accumulating only the combustion time.

The abnormality presence / absence determining means 111 constantly compares the concentration of carbon monoxide detected by the CO sensor 25 with a predetermined reference upper limit value, and if it is less than the reference upper limit value (step S802; N), It is determined that there is no abnormal combustion, and the operation of sequentially storing the history of the carbon monoxide concentration in the history storage unit 151 as described above is continued.

If the concentration of carbon monoxide detected by the CO sensor 25 is equal to or higher than the reference upper limit (step S80)
2; Y), it is determined that a combustion abnormality has occurred. When the abnormality is detected by the abnormality determining unit 111 in this way, the primary determining unit 113 of the combustion cause determining unit 112
Reads the value (C1) of the carbon monoxide concentration two hours before the cumulative combustion time only from the history storage means 151 (step S803). And the current value of carbon monoxide concentration (C
2) is compared with the value (C1) of the carbon monoxide concentration two hours before, and it is determined whether or not the difference is less than 200 ppm (step S804).

The current value (C2) of carbon monoxide concentration and 2
The difference from the value (C1) of the carbon monoxide concentration before the time is 200 p
If it is less than pm (step S804; N), since the concentration of carbon monoxide is gradually increasing over a relatively long period of time, it is determined that the cause of the combustion abnormality is the second type such as clogging of the fin ( Step S805). Error handling means 115
Is determined by the primary determination means 113 as the cause of the combustion abnormality.
If it is determined that it is a seed (fin clogging or the like), an error code or the like corresponding to the fin clogging error is displayed on the error display section 166 of the remote controller 160 (step S80).
6).

Further, the supply of the combustion gas is immediately stopped, and the error release condition for fin clogging is set (step S8).
07). Specifically, until the heat exchanger 23 is cleaned or replaced by a service person or the like, the combustion stop state is maintained until the reset switch of the electrical board 100 is pressed, and an error occurs when the reset switch is pressed. Cancel.

The current value (C2) of carbon monoxide concentration and 2
The difference from the value (C1) of the carbon monoxide concentration before the time is 200 p
pm or more (step S804; Y), since the concentration of carbon monoxide has increased in a relatively short time, it is determined that the cause of the combustion abnormality is the first type (flooding or strong wind) (step S804). S808). If it is determined to be the first type, the secondary determination means 114 monitors the change in the concentration of carbon monoxide detected by the CO sensor 25 for the next 10 seconds (step S809), and the fluctuation range of the concentration of carbon monoxide is 100 pp.
It is determined whether the value is equal to or less than m (step S810).

If the fluctuation range is 100 ppm or less (step S810; Y), it is determined that the cause of the combustion abnormality is flooding because the fluctuation range is relatively small (step S81).
1). When the secondary determination unit 114 determines that the cause of the combustion abnormality is flooding, the abnormality handling unit 115 displays an error code or the like indicating that the combustion abnormality has occurred on the error display unit 166 of the remote controller 160. (Step S812).

Further, the supply of the combustion gas is immediately stopped, and an error canceling condition for flooding is set (step S813).
In the case of flooding, it is necessary to take measures such as cleaning around the bathroom drain 204, so that the combustion stop state is maintained until the operation switch 162 of the appliance is once turned off. Therefore, once the operation switch 162 is turned off and then the operation switch 162 is turned on, the error is released.

If the fluctuation range of the carbon monoxide concentration exceeds 100 ppm (step S810; N), the fluctuation range is large, so that it is determined that the cause of the abnormal combustion is strong wind (step S814). When the secondary determination unit 114 determines that the cause of the combustion abnormality is a strong wind, the abnormality handling unit 115 indicates to the error display unit 166 of the remote controller 160 that a combustion abnormality has occurred due to the strong wind (such as insufficient exhaust). An error code or the like is displayed (step S815).

Further, the supply of the combustion gas is immediately stopped, and an error canceling condition for the strong wind is set (step S816).
In the case of strong wind, there is no problem even if combustion restarts as soon as the wind stops, so the user once closes the tap and the error is released when the water amount sensor 33 and the hot water supply confirmation water amount sensor 34 are turned off. If an abnormal combustion due to strong wind occurs during the reheating operation, the error is canceled when the user starts the reheating operation again.

As described above, the cause of the abnormal combustion, particularly whether or not the vehicle is flooded, is determined by using the CO sensor 25. Therefore, it is not necessary to provide a dedicated sensor for detecting the flooding unlike the related art. The configuration can be simplified.

In the embodiment described above, the current carbon monoxide concentration (C2) and the carbon monoxide concentration (C
1), and the cause of the combustion abnormality was determined to be the first type and the second type based on the magnitude of the difference, but the comparison target is not limited to the carbon monoxide concentration two hours before. . For example, it may be one hour before or three hours before. Further, the difference between the carbon monoxide concentrations in the determination standard is not limited to 200 ppm, and may be changed as appropriate according to the specification of the appliance. The fluctuation range and the monitoring time of the criterion for determining whether the wind is the strong wind or the flood are not limited to those exemplified in the embodiment.

In addition, in the embodiment, an example of one-can-two-channel hot water supply and reheating is shown. However, a one-can-one-channel type or a two-can-two-channel type may be used, and the type of the combustion device may be different. It doesn't matter. Of course, the combustion abnormality detecting device according to the present invention may be applied to a combustion device other than the bath water heater installed in the bathroom. For example, even in the case of an outdoor installation type, there is a risk of flooding depending on the installation location, so it is effective to mount the combustion abnormality detection device according to the present invention.

The fuel supplied to the burner may be petroleum or the like in addition to gas. For oil or the like, a burnerless type such as a gun type burner may be used.

[0068]

According to the combustion abnormality detecting apparatus of the present invention, the concentration of carbon monoxide is detected by using the normally equipped CO sensor, and the change pattern is determined from the rate of increase and the fluctuation width of the concentration of carbon monoxide. Based on the identification, the cause of the abnormal combustion is determined to be fin clogging, flooding, strong wind, and the like. For this reason, it is not necessary to provide a dedicated sensor or the like for each cause of the combustion abnormality, and the size of the device and the price of the device can be reduced.

In a combustion device such as a bath water heater provided with the above-described combustion abnormality detection device, the error release condition is switched and changed for each cause of the combustion abnormality determined by the combustion abnormality detection device. Appropriate measures can be taken.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of a single-can multi-channel type water heater according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a state in which a bathroom in which a one-can multi-channel water heater according to an embodiment of the present invention is installed is viewed from above.

FIG. 3 is an explanatory view showing a step of a floor surface of a bathroom in which a one-can multi-channel type water heater according to an embodiment of the present invention is installed, and a schematic configuration inside the one-can multi-channel type water heater; is there.

FIG. 4 is a block diagram illustrating a configuration of a single-can multi-channel water heater that is a combustion device equipped with a combustion abnormality detection device according to one embodiment of the present invention.

FIG. 5 is an explanatory diagram showing a characteristic of increasing the concentration of carbon monoxide when a cause of abnormal combustion is fin clogging or the like.

FIG. 6 is an explanatory diagram showing a characteristic of increasing the concentration of carbon monoxide when the cause of the combustion abnormality is flooding.

FIG. 7 is an explanatory diagram showing a characteristic of increasing a carbon monoxide concentration when a cause of abnormal combustion is a strong wind.

FIG. 8 is a flowchart showing an operation of the one-can multi-channel type water heater according to one embodiment of the present invention until a combustion abnormality is detected, its cause is determined, and a countermeasure is taken;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... One-can multi-channel water heater 11 ... Exhaust pipe connection part 12 ... Air supply cylinder connection part 13 ... Hot water tap 14 ... Shower head 21 ... Combustion chamber 21a ... Air supply port 22 ... Burner 23 ... Heat exchanger 24 ... Combustion Fan 25 CO sensor 26 Igniter 31 Water amount control valve 32 Bypass water amount control valve 33 Water amount sensor 34 Hot water supply confirmation water amount sensor 40 Hot water supply passage 40 a Hot water supply heat receiving tube 41 Water supply passage 42 Water supply passage 43 ... fixed bypass passage 44 ... branching point 45 ... junction 46 ... bypass passage 50 ... reheating channel 50a ... bath heat receiving tube 51 ... bath return channel 52 ... bath outflow channel 54 ... pouring connection tube 61 ... water entry thermistor 62: Heat exchange outlet thermistor 63: Hot water thermistor 71: Circulation pump 72: Reheating water switch 73: Bath thermistor 74: Pouring solenoid valve 75: Reverse Valve 76: Overpressure relief valve 100: Electrical board 110: CPU 111: Abnormality determination means 112: Combustion cause determination means 113: Primary determination means 114: Secondary determination means 115: Abnormality handling means 120: ROM 130: RAM 140 ... Timer section 150 Non-volatile RAM 151 History storage means 160 Remote controller 161 Operation section 162 Operation switch 165 Display section 166 Error display section 201 Washing place 202 Bathtub arrangement 203 Bath tub 204 Bathroom drain 205 Drainage port 206 ... Suction and discharge port

Continuing from the front page (72) Inventor Kiyoshi Umezawa 3-4 Fukamidai, Yamato-shi, Kanagawa Prefecture Inside Gaster Co., Ltd. (72) Inventor Yuhiro Shiyama 3-4 Fukamidai, Yamato-shi, Kanagawa Prefecture Gaster Co., Ltd. (72 ) Inventor Tatsuya Wada 3-4 Fukamidai, Yamato-shi, Kanagawa Prefecture Inside Gaster Co., Ltd. (72) Inventor Atsushi Akamatsu 3-4 Fukamidai, Yamato-shi, Kanagawa Prefecture F-term in Gaster Co., Ltd. 3K003 RA01 TA01 TB07 TC08

Claims (9)

[Claims] An apparatus for detecting abnormal combustion in a combustion section, comprising: a sensor for detecting a concentration of carbon monoxide in exhaust gas discharged from the combustion section; and an abnormal cause determining means for determining a cause of the abnormal combustion. The abnormality cause determination means identifies what kind of pattern the carbon monoxide concentration detected by the sensor has changed with the passage of time, and determines the cause of the combustion abnormality based on the identification result. A combustion abnormality detection device, characterized in that: 2. A combustion abnormality detecting device for detecting a combustion abnormality in a combustion section, comprising: a sensor for detecting a concentration of carbon monoxide in exhaust gas discharged from the combustion section; An abnormal cause determining unit that determines the cause of the combustion abnormality, wherein the abnormality presence / absence determining unit compares the carbon monoxide concentration detected by the sensor during combustion of the combustion unit with a predetermined reference value, and It is to determine whether the combustion state of the combustion unit is abnormal, the abnormality cause determination means, to identify in what pattern the carbon monoxide concentration detected by the sensor has changed over time, A combustion abnormality detection device for determining the cause of a combustion abnormality based on the identification result. 3. The combustion abnormality detecting device according to claim 1, wherein the abnormality cause determining means determines the cause of the combustion abnormality based on the rate of increase in the concentration of carbon monoxide. 4. The apparatus according to claim 1, wherein said abnormality cause determining means determines the cause of the combustion abnormality based on whether or not the concentration of carbon monoxide fluctuates within a certain range or more. Or the combustion abnormality detection device according to 2. 5. The abnormality cause determining means determines the cause of the combustion abnormality based on the rate of increase of the concentration of carbon monoxide and whether or not the concentration of carbon monoxide fluctuates within a certain fluctuation range. The combustion abnormality detection device according to claim 1 or 2, wherein: 6. The abnormal cause determining means determines that the cause of the abnormal combustion is a strong wind when the concentration of carbon monoxide fluctuates within a certain fluctuation range.
6. The combustion abnormality detection device according to 2, 4, or 5. 7. The combustion abnormality detecting device, wherein the combustion unit is attached to a combustion device disposed near a bottom of the appliance body, wherein the abnormality cause determination unit determines that the rate of increase in the concentration of carbon monoxide is low. 7. The abnormal combustion detection according to claim 1, wherein it is determined that the cause of the abnormal combustion is a strong wind or a submergence in which the combustion part is immersed in water. apparatus. 8. A combustion abnormality detecting device for detecting a combustion abnormality in a combustion section, wherein the combustion section is attached to a combustion apparatus arranged near a bottom of an appliance body. A sensor for detecting the concentration of carbon monoxide, history storage means for storing a history of the concentration of carbon monoxide detected by the sensor during combustion of the combustion unit, and determining whether or not the combustion state of the combustion unit is abnormal. Abnormality determining means for determining, and abnormality cause determining means for determining a cause of combustion abnormality, wherein the abnormality determining means is configured to determine a concentration of carbon monoxide detected by the sensor during combustion of the combustion unit and a predetermined value. It is to determine whether the combustion state of the combustion unit is abnormal by comparing with a reference value, the abnormality cause determination means, the cause of the combustion abnormality, of the flooding and strong wind in which the combustion unit is immersed in water The first of which is either
A primary determination unit for roughly classifying the first type of abnormality into a flood and a strong wind, and a primary determination unit for roughly classifying the first type of abnormality cause into a flood and a strong wind. When the abnormality presence / absence determination unit determines that the combustion state of the combustion unit is abnormal, the concentration of carbon monoxide in the exhaust gas increases at a certain rate or more with reference to the storage content of the history storage unit. It is determined whether or not the combustion has occurred at a rate of increase above a certain level, and the cause of the current combustion abnormality is determined to be the first type. The secondary determining means determines the cause of the abnormality as the second type. When the primary determining means determines that the cause of the combustion abnormality is the first type, the secondary determining means detects one of the abnormalities by the sensor. The carbon oxide concentration fluctuates over a certain range Investigate whether or not this fluctuation is more than a certain fluctuation range, determine that the cause of this combustion abnormality is strong wind, and if it is not fluctuation more than a certain fluctuation range, determine the cause of this combustion abnormality. A combustion abnormality detection device characterized by determining that: 9. A combustion system comprising the combustion abnormality detecting device according to claim 1, 2, 3 or 4, when a combustion abnormality is detected, and thereafter, a predetermined release condition is set. Abnormality coping means for stopping combustion in the combustion section until the condition is satisfied, wherein the abnormality coping means changes the release condition according to the cause of the combustion abnormality indicated by the result of the judgment by the abnormality cause judging means. A combustion device, characterized in that: