JP2003004236A - Gas cooking device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating and cooking device in which the incomplete combustion of a burner is detected and the incomplete combustion is prevented from continuing. SOLUTION: A gas table 1 comprises a complete primary combustion type burner 2 having as an upper surface a glass plate 3 on which a material to be heated is mounted and provided in a combustion chamber 14, a gas nozzle 12 for supplying fuel gas to the burner 2, an exhaust passage 15 having one end communicating with the combustion chamber 14 and the other end communicating with an exhaust port 4, an air supply and exhaust fan 5 for supplying combustion air to the burner 2 through an air supply space 13 and feeding the combustion exhaust gas of the burner 2 to the exhaust port 4 through the exhaust passage 15 and a controller 6 (6a) for controlling the operation of the gas table 1. When the thermal electromotive force of a thermocouple 16 reaches a prescribed level or higher, the controller 6 (6a) decides that the incomplete combustion of the burner 2 is generated to stop the supply of the fuel gas to the burner 2 from the gas nozzle 12 and turn on an abnormality lamp provided in an operation panel 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to combustion control of a gas cooker for heating a food item placed on the upper part of a combustion chamber by means of a burner of all primary combustion type provided in the combustion chamber.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10A, the upper surface of a combustion chamber provided with a burner 100 is a glass plate 101, and a cooked food placed on the glass plate 101 is heated. Known gas cookers. In such a gas cooker, the air supply / exhaust fan 102
As a result, combustion air is supplied to the burner 100, and the combustion exhaust gas of the burner 100 is exhausted from the exhaust port 103.

FIG. 10 (b) is a sectional view of the heating cooker shown in FIG. 10 (a) as seen from the left side, and the controller 105 is the target of the burner 100 adjusted by the combustion amount adjusting section 104. The flow rate of the fuel gas supplied from the gas supply path (not shown) to the mixing tube 106 and the flow rate of the combustion air supplied from the air supply / exhaust fan 102 to the mixing tube 106 are set according to the combustion amount. As a result, the mixture of the fuel gas and the combustion air mixed at an appropriate mixing ratio is supplied to the burner 100, and the burner 100 can be burned while maintaining a good air-fuel ratio.

However, in the process of using the gas cooker, oil or dust may adhere to the air supply passage (not shown) or the exhaust passage 107 of the gas cooker. Then, when such adhesion of oil or dust progresses, the supply of combustion air to the burner 100 is hindered, and the burner 10 is deficient due to a shortage of combustion air.
Incomplete combustion of 0 will occur.

The user of the gas cooker uses the burner 10
If you did not notice the incomplete combustion of 0, burner 10
There was an inconvenience that incomplete combustion of 0 was continued.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a heating cooker which solves the above-mentioned inconvenience and prevents the incomplete combustion from continuing when the incomplete combustion occurs. To aim.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and is a burner of all primary combustion type provided in a combustion chamber on which an object to be heated is placed, The present invention relates to an improvement of a gas cooker including a fuel gas supply means for supplying a fuel gas to the burner and an exhaust passage having one end communicating with the combustion chamber and the other end communicating with an exhaust port.

A first aspect of the present invention is a flame detecting means provided near the exhaust port for detecting a combustion flame,
When combustion flame due to secondary combustion is detected by the flame detection means during combustion of the burner, at least one of stop of supply of fuel gas from the fuel gas supply means to the burner and abnormality notification. And a combustion abnormality coping means for performing one of the above.

According to the present invention, when incomplete combustion of the burner occurs and unburned gas or incomplete combustion gas (hereinafter referred to as unburned gas) is discharged through the exhaust passage, Secondary combustion occurs when the unburned gas or the like reaching the exhaust port comes into contact with the air near the exhaust port. Therefore, the combustion abnormality coping means supplies the fuel gas from the fuel gas supply means to the burner when the flame detection means provided near the exhaust port detects a combustion flame due to secondary combustion. At least one of the stop and the abnormality notification. Thus, the combustion abnormality coping means immediately stops the incomplete combustion of the burner when the supply of the fuel gas from the fuel gas supply means to the burner is stopped, and when the abnormality is notified, the user does not. It is possible to prevent the incomplete combustion of the burner from being continued by recognizing that the incomplete combustion of the burner has occurred and prompting the extinction of the burner.

In a second aspect of the present invention, an oxidation catalyst provided near the exhaust port, temperature detecting means for detecting a temperature near the oxidation catalyst, and the temperature during combustion of the burner are used. And a combustion abnormality coping means for performing at least one of stopping the supply of the fuel gas from the fuel gas supply means to the burner and reporting an abnormality when the temperature detected by the detection means becomes equal to or lower than a predetermined temperature. It is characterized by having.

According to the present invention, when incomplete combustion of the burner occurs and unburned gas or the like is discharged through the exhaust passage, the unburned gas or the like guided to the exhaust port is exhausted. By contacting the oxidation catalyst and the air near the mouth, catalytic combustion without combustion flame is performed. Therefore, the combustion flame due to the secondary combustion does not overflow from the exhaust port.
In addition, the consumption of the incomplete combustion gas due to the catalytic combustion has the effect of reducing the concentration of the incomplete combustion gas such as CO exhausted from the exhaust port.

Since heat is generated in association with the catalytic combustion, the combustion abnormality coping means is provided when the temperature detected by the temperature detecting means provided near the exhaust port becomes equal to or higher than the predetermined temperature. The incomplete combustion of the burner is continued because it is determined that catalytic combustion has occurred and at least one of stopping the supply of the fuel gas from the fuel gas supply means to the burner and notifying the abnormality is performed. Can be prevented. Further, in order for the secondary combustion of the unburned gas generated by the incomplete combustion of the burner to occur, it is premised that the temperature and the concentration of the unburned gas become high to some extent, but the catalytic combustion is the secondary combustion. Since the temperature and concentration of the unburned gas is lower than when combustion occurs, the present invention can detect the incomplete combustion earlier.

In the second aspect, the temperature detecting means is configured to detect the temperature difference between the upstream side and the downstream side of the oxidation catalyst as the detected temperature, so that the temperature before and after the catalytic combustion occurs. From the difference, it is possible to reliably detect the occurrence of the catalytic combustion.

Further, a third aspect of the present invention is to provide an inlet for the secondary air provided at an intermediate portion of the exhaust passage, and a flame detecting means provided near the inlet for detecting a combustion flame. ,
At least one of stopping the supply of fuel gas from the fuel gas supply means to the burner and reporting an abnormality when the combustion flame due to secondary combustion is detected by the flame detection means during combustion of the burner. It is characterized by including a combustion abnormality coping means for performing either of the above.

According to the present invention, when incomplete combustion of the burner occurs and unburned gas or the like is discharged through the exhaust passage, the secondary air provided in the middle of the exhaust passage. The unburned gas or the like led to the inlet of the above-mentioned gas comes into contact with the air introduced from the inlet, and secondary combustion occurs. In this case, since secondary combustion occurs in the exhaust passage, it is possible to prevent the flame from overflowing from the exhaust port. Then, the combustion abnormality coping means transfers from the fuel gas supply means to the burner when a combustion flame due to secondary combustion is detected by the flame detection means provided near the inlet of the secondary air. Since at least one of stopping the supply of the fuel gas and notifying the abnormality is performed, it is possible to prevent the incomplete combustion of the burner from continuing.

Further, in the third embodiment, the flame detecting means is provided in the path through which air flows in from the inlet of the secondary air, whereby the flame detecting means is cooled by the secondary air. As a result, deterioration of the flame detecting means due to heating can be suppressed.

In a fourth aspect of the present invention, a secondary air inlet provided at an intermediate portion of the exhaust passage, an oxidation catalyst provided near the inlet, and the vicinity of the oxidation catalyst. When temperature detected by the temperature detecting means provided in the burner is higher than or equal to a predetermined temperature during combustion of the burner,
Combustion abnormality coping means for performing at least one of stopping the supply of fuel gas from the fuel gas supply means to the burner and reporting an abnormality is provided.

According to the present invention, when incomplete combustion of the burner occurs and unburned gas or the like is discharged through the exhaust passage, the secondary air provided in the middle of the exhaust passage. The unburned gas or the like introduced to the inflow port comes into contact with the air introduced from the inflow port and the oxidation catalyst to cause catalytic combustion. Then, the combustion abnormality coping means determines that catalytic combustion has occurred when the temperature detected by the temperature detecting means becomes equal to or higher than the predetermined temperature, and the fuel gas supply is performed, as in the second aspect described above. Since at least one of stopping the supply of the fuel gas from the means to the burner and notifying the abnormality is performed, it is possible to prevent the incomplete combustion of the burner from continuing. Further, according to the present invention, since catalytic combustion occurs in the exhaust passage, it is possible to prevent the vicinity of the exhaust port from becoming hot.

Further, in the fourth aspect, the temperature detection means is set to detect the temperature difference between the upstream side and the downstream side of the oxidation catalyst as the detected temperature, whereby the temperature before and after the catalytic combustion occurs. From the difference, it is possible to reliably detect the occurrence of the catalytic combustion.

In the third and fourth aspects, the combustion exhaust of the burner and the combustion exhaust of the burner are provided downstream of the secondary air inflow port of the exhaust passage by obstructing ventilation of the exhaust passage. By providing an exhaust passage blocking means for promoting the mixing of the secondary air with the air flowing in from the inlet,
It is possible to easily cause the secondary combustion and the catalytic combustion. And thereby, the incomplete combustion of the burner can be detected earlier.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to FIGS. 1 is a configuration diagram of a gas table which is a gas cooker of the present invention, FIG. 2 is a configuration diagram of a gas table in the first and second embodiments of the present invention, and FIG. 3 is a thermocouple for a primary air ratio. A graph showing changes in output voltage and CO concentration, FIG. 4 is a configuration diagram of a gas table in the third and fourth embodiments of the present invention, and FIG. 5 is a gas table in the third embodiment of the present invention. FIGS. 6 to 9 are explanatory views of the path of unburned gas and secondary air, and FIG. 6 to FIG. 9 are configuration diagrams of a gas table according to the third embodiment of the present invention.

Referring to FIG. 1 (a), a gas table 1 which is a gas cooker according to the present invention includes a burner 2 of all primary combustion type.
(2a, 2b, 2c) is for heating a cooking product placed on a glass plate 3 forming an upper surface of a combustion chamber accommodating (2a, 2b, 2c), supplying combustion air to the burner 2 and combustion exhaust gas of the burner 2. Air supply / exhaust fan 5 for sending the air to the exhaust port 4
And a controller 6 for controlling the operation of the gas table 1.
(Including the function of the combustion abnormality coping means of the present invention, configured by a microcomputer and memory, etc.), and an abnormality for notifying an abnormality of the operation switch or the gas table 1 for starting / stopping heating, setting a heating amount, etc. An operation panel 7 provided with a lamp and the like is provided. Further, the gas table 1 is provided with a grill 8.

Next, a first embodiment of the present invention will be described with reference to FIGS. 1 (b) and 2 (a). Figure 1
(B) and FIG. 2 (b) show the gas table 1 shown in FIG.
3 is a cross-sectional view seen from the left side surface of FIG. A mixing pipe 10 communicates with the burner 2a, fuel gas is injected into the mixing pipe 10 from a gas nozzle 12 connected to the tip of a gas supply pipe 11, and the combustion air sucked by the air supply / exhaust fan 5 is supplied. The mixture gas is supplied to the mixing pipe 10 through the space 13, and the fuel gas and the combustion air are mixed in the mixing pipe 10. And
The mixture of fuel gas and combustion air reaches the burner 2a,
The burner 2a is burned by the complete primary combustion, and the combustion exhaust gas of the burner 2a is discharged from the combustion chamber 14 through the exhaust passage 15 and the exhaust port 4.

Here, the target combustion amount of the burner 2a is set by the heating amount setting switch provided on the operation panel 7, and the controller 6a determines the supply amount of the fuel gas and the combustion air according to the target combustion amount. By determining, the burner 2a is burned while maintaining a good air-fuel ratio. The controller 6a uses the air supply / exhaust fan 5 stored in the memory in advance.
The supply amount of the combustion air is set by controlling the rotation speed of the supply / exhaust fan 5 on the basis of the correlation data between the rotation speed and the supply amount of the combustion air. If dust or oil adheres to the communicating air supply passage (not shown) or the exhaust passage 15, the supply of combustion air in proportion to the rotation speed of the air supply / exhaust fan 5 cannot be obtained.

As a result, the supply amount of combustion air is insufficient with respect to the supply amount of fuel gas, resulting in incomplete combustion of the burner 2a. Therefore, in order to detect the incomplete combustion of the burner 2a, a thermocouple 16 (corresponding to the flame detecting means of the present invention) is provided near the exhaust port 4.

Then, as shown in FIG. 2A, high temperature unburned gas or incompletely burned gas (hereinafter referred to as unburned gas etc.) reaches the exhaust port 4 and comes into contact with the air in the vicinity of the exhaust port 4. Then, a combustion flame 20 is generated by secondary combustion of unburned gas or the like.
Here, FIG. 3 is a graph (in the figure) showing a change in CO concentration with respect to the primary air ratio (ratio of the supply flow rate of the primary air to the supply flow rate of the fuel gas) and the thermocouple 14 with respect to the primary air ratio. The graph (in the figure) showing the change in the output voltage is shown. From FIG. 3, when the primary air ratio becomes 1.0 or less and the supply of combustion air becomes insufficient,
It can be seen that incomplete combustion of the burner 2a occurs and the concentration of CO rapidly increases, and the output voltage of the thermocouple 14 also increases due to the occurrence of secondary combustion.

Therefore, the controller 6a uses the thermocouple 14
When the output voltage of 2 is equal to or higher than a predetermined voltage (Vth in the figure), it is determined that combustion flame due to secondary combustion is detected, and the supply of fuel gas to the burner 2a is stopped to burn the burner 2a. While stopping, operation panel 7 (see FIG. 1 (a))
An abnormal lamp (not shown) provided in the lamp is turned on to notify the user of the occurrence of incomplete combustion. As a result, the controller 6a prevents the incomplete combustion of the burner 2 from continuing and informs the user of the cause of extinguishing the burner 2.

Next, a second embodiment of the present invention will be described with reference to FIG. In addition, the above-mentioned first
The same components as those in the embodiment are given the same reference numerals and the description thereof will be omitted.

In the gas table shown in FIG. 2B, an oxidation catalyst 25 (platinum, palladium, ruthenium, etc.) is provided near the exhaust port 4. When incomplete combustion of the burner 2a occurs and unburned gas or the like is generated, unburned gas (CH ₄ or the like) or incomplete combustion gas (CO or the like) delivered to the vicinity of the exhaust port 4 via the exhaust passage 15 is generated. When) comes into contact with the oxidation catalyst 25 and air, catalytic combustion represented by the following chemical formulas (1) and (2) occurs.

CH ₄ + 2O ₂ → CO ₂ + 2H ₂ O + Q ₁ (J) ・ ・ ・ (1) CO + 1 / 2O ₂ → CO ₂ + Q ₂ (J) ・ ・ ・ ・ ・ ( 2) And the heat (Q ₁ , Q ₂ ) generated by this catalytic combustion
As a result, the temperature near the exhaust port 4 rises. Therefore, the controller 6b determines that catalytic combustion has occurred when the temperature detected by the thermocouple 14 (corresponding to the temperature detecting means of the present invention) is equal to or higher than a predetermined temperature, and supplies the fuel gas to the burner 2a. Is stopped to stop the combustion of the burner 2a, and an abnormality lamp (not shown) provided on the operation panel 7 is turned on. Thereby, the controller 6b prevents the incomplete combustion of the burner 2a from being continued.

The thermocouple 2 is also provided on the upstream side of the oxidation catalyst 25.
6 may be provided, and it may be determined that catalytic combustion has occurred when the difference between the temperature detected by the thermocouple 14 and the temperature detected by the thermocouple 26 exceeds a predetermined temperature. In this way, by detecting the temperature difference between the upstream side and the downstream side of the oxidation catalyst 25,
Since it is possible to detect an increase in temperature due to catalytic combustion, the controller 6b can more reliably recognize the occurrence of catalytic combustion.

Next, a third embodiment of the present invention will be described with reference to FIG. In addition, the above-mentioned first
The same components as those in the embodiment are given the same reference numerals and the description thereof will be omitted.

In the heating cooker shown in FIG. 4A, a secondary air inlet 30 is provided in the middle of the exhaust passage 15, and the inlet 30 is an air intake provided on the lower surface of the heating cooker. It communicates with the mouth 31. A thermocouple 32 (corresponding to the flame detecting means of the present invention) is provided near the inflow port 30.

When incomplete combustion of the burner 2a occurs in the heating cooker shown in FIG. 4 (a), unburned gas or the like produced by the incomplete combustion goes to the exhaust port 4 via the exhaust passage 15. However, when it comes into contact with the air that has flowed in through the secondary air inlet 30, a combustion flame 33 is generated by the secondary combustion of unburned gas. In this case, 2 such as unburned gas
Since the secondary combustion occurs near the secondary air inlet 30, the secondary combustion flame 33 can be suppressed from overflowing from the exhaust port 4.

Then, the controller 6c judges that the combustion flame due to the secondary combustion is detected when the thermoelectromotive force of the thermocouple 32 becomes equal to or higher than a predetermined level, as in the first embodiment described above. Then, the supply of the fuel gas to the burner 2a is stopped to stop the combustion of the burner 2 and an abnormal lamp (not shown) provided on the operation panel 7 (see FIG. 1A) is turned on.

Next, a fourth embodiment of the present invention will be described with reference to FIG. In addition, the above-mentioned first
The same components as those in the embodiment are given the same reference numerals and the description thereof will be omitted.

In the heating cooker shown in FIG. 4 (b), a secondary air inlet 35 is provided in the middle of the exhaust passage 15, and the inlet 35 is an air intake provided in the front of the heating cooker. It communicates with the mouth 36. Further, an oxidation catalyst 37 and a thermocouple 38 (corresponding to the temperature detecting means of the present invention) are provided on the downstream side near the inflow port 35. Then, in this manner, the secondary air inlet 35 is provided on the upstream side of the oxidation catalyst 37.
By providing the above, the oxygen that has flowed in from the inflow port 35 is reliably supplied to the oxidation catalyst 37 to facilitate catalytic combustion.

In the heating cooker shown in FIG. 4 (b),
When the incomplete combustion of the burner 2a occurs and unburned gas or the like is generated, the unburned gas or the like is sent toward the exhaust port 4 through the exhaust passage 15, and the air that has flowed in from the secondary air inflow port 35 is discharged. At the same time, it contacts the oxidation catalyst 37, and catalytic combustion occurs.

The heat generated by this catalytic combustion (see the above chemical formulas (1) and (2)) causes the oxidation catalyst 37
The temperature in the vicinity rises. Therefore, the controller 6d
Similarly to the above-described second embodiment, when the temperature detected by the thermocouple 38 becomes equal to or higher than a predetermined temperature, it is determined that catalytic combustion has occurred, and the supply of fuel gas to the burner 2a is stopped, and An abnormal lamp (not shown) provided on the operation panel 7 is turned on. As a result, the controller 6d
The incomplete combustion of the burner 2a is prevented from being continued.

Also in the fourth embodiment, as in the second embodiment described above, a thermocouple 39 is provided upstream of the oxidation catalyst 37 to detect the temperature detected by the thermocouple 38 and the thermocouple. When the difference between the detected temperatures of 39 exceeds a predetermined temperature,
It may be determined that catalytic combustion has occurred.

Further, as shown in FIG. 5A, in the above-described third embodiment, the thermocouple 32 is provided in the inflow path of the air 40 which flows in from the secondary air inflow port 30. Thus, the effect of cooling the thermocouple 32 can be obtained. And thereby, the deterioration of the thermocouple 32 due to heating can be suppressed.

Further, as shown in FIG. 5B, in the above-described third embodiment, a closing plate 45 (corresponding to the exhaust passage closing means of the present invention is provided near the inlet 30 of the secondary air. ), It is possible to generate a vortex between the air 42 flowing in from the inflow port 30 and the unburned gas 43 sent to the exhaust passage 15. As a result, the mixing of the secondary air with the unburned gas or the like is promoted, and secondary combustion easily occurs. Note that, also in the above-described fourth embodiment,
By providing the blocking plate 45, the mixing of the secondary air with the unburned gas or the like is promoted, and catalytic combustion can be facilitated.

Further, the above-described third embodiment and fourth embodiment
In the embodiment, the air intakes (31, 36) are provided on the lower surface of the heating cooker, but as shown in FIG. 6 (a), the air intakes 50 may be provided on the front surface of the heating cooker. Good.

The above-described third embodiment and fourth embodiment
6 (b), the air taken in from the air intake port 51 is passed through the inside of the heating cooker to flow in from the inflow port 30 to cool the inside of the heating cooker. The effect can be obtained.

Further, as shown in FIGS. 7A and 7B, throttle portions 60 and 61 (corresponding to the exhaust passage closing means of the present invention) may be provided in the exhaust passage 15. As a result, the delivery speed of the unburned gas that has passed through the throttle portions 60 and 61 increases, and turbulent flow is likely to occur, so that mixing of the unburned gas and the secondary air can be promoted.

As shown in FIGS. 8A and 8B, the throttle portions 70 and 72 (corresponding to the exhaust passage closing means of the present invention) are connected to the secondary air inlets 71 and 73. By arranging it on the downstream side, it is possible to further promote the mixing of unburned gas and the like with combustion air.

As shown in FIGS. 9 (a) and 9 (b), in the structure shown in FIGS. 6 (a) and 6 (b), the air intake port 50 to the secondary air inlet port. Fans 80 and 81 may be provided in the inflow path of air to the air inlet 30 and in the inflow path of air from the air intake 51 to the inflow port 30 of the secondary air, respectively. As a result, the flow rate of the air flowing from the secondary air inlets 80 and 81 increases, so that the secondary combustion can be promoted. In addition, also in the configurations shown in FIGS. 3 to 5 and 7 to 8, a fan is provided in the inflow path of the secondary air to forcibly increase the flow rate of the air flowing in from the inflow port. Two
The generation of secondary combustion and catalytic combustion can be promoted.

In this embodiment, the thermocouple is used as the flame detecting means of the present invention, but other types of flame detecting elements such as a frame rod may be used. Further, although the thermocouple is used as the temperature detecting means of the present invention, another type of temperature detecting element such as a thermistor may be used.

Further, in this embodiment, when the incomplete combustion of the burner 2a is detected, both the supply of the fuel gas to the burner 2a is stopped and the abnormality is notified, but only one of them is performed. Also, the effect of the present invention can be obtained.

In the present embodiment, the secondary air inlets (30, 35) are provided on the lower surface of the exhaust passage 15, but the secondary air inlets may be provided on the side surfaces of the exhaust passage 15. .

Further, in this embodiment, the three burners 2 are used.
Although all of a, 2b, and 2c show the gas table 1 housed in the combustion chamber having the glass plate 3 as the top plate, at least one burner is provided in the combustion chamber having the top plate such as the glass plate 3 as the top plate. The present invention can be applied to any stored gas table.

Further, in this embodiment, the air supply / exhaust fan 5 is used.
Although the forced combustion type gas table for supplying the combustion air to the combustion chamber has been described above, the present invention can be applied to a natural combustion type gas table that is not provided with a supply / exhaust fan. Incidentally, in the forced combustion type gas table, as described above, by adjusting the supply flow rates of the fuel gas and the combustion air to the burner and changing the combustion amount of the burner,
Controls the amount of heat to be cooked. On the other hand, in a natural combustion type gas table, the amount of fuel gas supplied to the burner is kept constant to keep the burner combustion amount constant and the burner combustion time per predetermined unit time is adjusted.
The OFF control controls the amount of heat to be cooked.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a heating cooker according to the present invention.

FIG. 2 is a configuration diagram of a heating cooker according to first and second embodiments of the present invention.

FIG. 3 is a graph showing changes in the output voltage of the thermocouple and the CO concentration with respect to the primary air ratio.

FIG. 4 is a configuration diagram of a heating cooker according to third and fourth embodiments of the present invention.

FIG. 5 is an explanatory diagram of a distribution route of unburned gas and secondary air according to the third embodiment of the present invention.

FIG. 6 is a configuration diagram of a heating cooker according to third and fourth embodiments of the present invention.

FIG. 7 is a configuration diagram of a heating cooker according to third and fourth embodiments of the present invention.

FIG. 8 is a configuration diagram of a heating cooker according to third and fourth embodiments of the present invention.

FIG. 9 is a configuration diagram of a heating cooker according to third and fourth embodiments of the present invention.

FIG. 10 is a configuration diagram of a conventional heating cooker.

[Explanation of symbols]

1 ... Gas table, 2 ... Burner, 3 ... Glass plate,
4 ... Exhaust port, 5 ... Blower fan, 6 ... Controller, 10
… Mixing tube, 12… Gas nozzle, 13… Air supply space, 1
4 ... Combustion chamber, 15 ... Exhaust passage, 16 ... Thermocouple

Continued front page    F-term (reference) 3K023 KA07 KD07                 3K068 NA04 PA01 PA04                 3K070 DA06 DA26 DA52 DA58 DA73

Claims (8)

[Claims] 1. An all-primary combustion type burner provided in a combustion chamber on which an object to be heated is placed, a fuel gas supply means for supplying a fuel gas to the burner, and one end of the combustion chamber. A gas cooker having an exhaust passage, the other end of which communicates with an exhaust port, in which a flame detection unit is provided near the exhaust port to detect a combustion flame, and the flame detection unit during combustion of the burner. A combustion abnormality coping means for performing at least one of stopping the supply of the fuel gas from the fuel gas supply means to the burner and notifying an abnormality when a combustion flame due to secondary combustion is detected. Gas cooker characterized by that. 2. An all-primary combustion type burner provided in a combustion chamber on which an object to be heated is placed, a fuel gas supply means for supplying a fuel gas to the burner, and one end of the combustion chamber. In a gas cooker having an exhaust passage, the other end of which communicates with an exhaust port, an oxidation catalyst provided in the vicinity of the exhaust port, temperature detection means for detecting a temperature in the vicinity of the oxidation catalyst, and When the temperature detected by the temperature detection means becomes equal to or higher than a predetermined temperature during combustion of the burner, at least one of stop of supply of fuel gas from the fuel gas supply means to the burner and abnormality notification is performed. A gas cooker comprising: means for coping with combustion abnormality. 3. The gas cooker according to claim 2, wherein the temperature detecting means detects a temperature difference between the upstream side and the downstream side of the oxidation catalyst as the detected temperature. 4. An all-primary combustion type burner provided in a combustion chamber on which an object to be heated is placed, a fuel gas supply means for supplying a fuel gas to the burner, and one end of the combustion chamber. In a gas cooker having an exhaust passage having the other end communicated with an exhaust port, a secondary air inlet provided at an intermediate point of the exhaust passage and a combustion flame provided near the inlet. And a flame detecting means for detecting the
Combustion abnormality coping means for performing at least one of stopping the supply of fuel gas from the fuel gas supply means to the burner and reporting an abnormality when a combustion flame due to secondary combustion is detected. Gas cooker characterized by. 5. The gas cooker according to claim 4, wherein the flame detecting means is provided in a path through which air flows from the inlet of the secondary air. 6. An all-primary combustion type burner provided in a combustion chamber on which an object to be heated is placed, a fuel gas supply means for supplying a fuel gas to the burner, and one end of the combustion chamber. In a gas cooker having an exhaust passage having the other end in communication with an exhaust port, a secondary air inlet provided at an intermediate point of the exhaust passage and an oxidation catalyst provided near the inlet. And a temperature detecting means provided in the vicinity of the oxidation catalyst, and a fuel from the fuel gas supplying means to the burner when the temperature detected by the temperature detecting means becomes equal to or higher than a predetermined temperature during combustion of the burner. A gas cooker, comprising: a combustion abnormality coping means for performing at least one of stopping gas supply and reporting an abnormality. 7. The gas cooker according to claim 6, wherein the temperature detecting means detects a temperature difference between the upstream side and the downstream side of the oxidation catalyst as the detected temperature. 8. A mixture of combustion exhaust gas of the burner and air introduced from the inlet of the secondary air, which blocks ventilation in the exhaust passage, downstream of the inlet of the secondary air in the exhaust passage. The gas cooker according to any one of claims 4 to 7, characterized in that an exhaust passage closing means for promoting the above is provided.