JP2002130668A - Combustion apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve both safety and handleability. SOLUTION: If an abnormality that has occurred is one caused by a flame failure, overheating, etc., this apparatus turns off only the Tr2 on heater side, and if it is the abnormality caused by an accidental fire, etc., on a grill part, this turns off only the Tr3 on grill side. On the other hand, if the occurring abnormality is circuit abnormality concerned with the apparatus at large such as a flame detecting circuit, etc., this turns off the Tr1 so as to inhibit the use of the whole apparatus.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burning appliance provided with a plurality of burning portions, such as a table stove provided with a cooking portion and a grill portion.

[0002]

2. Description of the Related Art For example, in a table stove, a safety valve is provided in a gas supply path to a stove section and a grill section, and the valve is held open by a safety valve control circuit during normal combustion. When a flame extinguishes, overheats, or the like occurs, and a thermocouple or a thermistor as abnormality detection means detects this, the safety valve control circuit cuts off the current to the safety valve, closes it, and stops gas supply. The safety valve control circuit includes two transistors for controlling the energization of the safety valve for each safety valve in the stove and the grill, respectively.
In this case, a serial connection was adopted.

[0003]

There are two types of abnormalities in a table stove: an abnormality caused by a problem in use of a combustion part detected by a thermocouple and a thermistor; Although there is an abnormality, in the conventional safety valve control circuit, all the safety valves are closed regardless of the type of the abnormality to stop the combustion of the entire appliance. If the latter circuit abnormality occurs, it is appropriate for safety. However, if the former circuit abnormality occurs, it is impossible to use other combustion units without abnormality, so that usability is impaired. on the other hand,
Since the safety valve control circuit itself has no means for detecting a circuit failure, if an ON failure or the like occurs in the transistor, the safety valve may not close even if the abnormality detection means detects misfire or overheating in the combustion section. . On the other hand, if the check means for detecting a circuit failure is provided, it is necessary to separately install the check means in accordance with the safety valve control circuit provided for each combustion section, resulting in an increase in cost.

Accordingly, a first aspect of the present invention is to provide a combustion apparatus which can improve both safety and usability with a simple configuration by improving a safety valve control circuit. It is. The second invention according to claim 3 is also provided by improving the safety valve control circuit.
It is an object of the present invention to provide a combustion apparatus that can improve safety with a simple configuration.

[0005]

According to a first aspect of the present invention, there is provided a safety valve control circuit, comprising:
The energizing transistors provided for each safety valve of each combustion unit and arranged in parallel with each other, one source transistor connected in series with the energizing transistors, and the energizing transistor and the source transistor are respectively turned on / off. And controllable energization control means. Depending on the type of abnormality detected by the abnormality detection means, the combustion of each combustion unit is stopped by turning off any of the energizing transistors, and the entire appliance is turned off by turning off the original transistor. It is characterized in that combustion stop can be selected. According to the second aspect of the present invention, in addition to the object of the first aspect, the state of energization of each safety valve is checked to further improve safety by reliably detecting a circuit failure of the safety valve control circuit itself. The power-on check means is provided, and when either the power-on transistor or the source transistor is turned off, the power-on check state of the safety valve is checked by the power-on check means so that the failure of the other transistor can be detected. is there.

According to a second aspect of the present invention, a safety valve control circuit is provided for each safety valve of each combustion section, and energizing transistors arranged in parallel with each other. Consisting of one original transistor connected in series with the energizing transistor, energizing control means capable of controlling ON / OFF of the energizing transistor and the original transistor respectively, and energizing checking means for checking the energized state of each safety valve. When one of the energizing transistor and the source transistor is turned off, the energization checking means checks the energized state of the safety valve to detect a failure of the other transistor. .

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a table stove as an example of a burning appliance. A table stove 1 includes two burning sections, a stove section 2 and a grill section 3. First, in the stove 2, reference numeral 4 denotes a stove burner, which includes a burner main body 5 to which a gas pipe 7 is connected and a burner head 6 mounted on the head of the burner main body 5. A main valve 9 and a magnet safety valve 10 that can be opened by operating the ignition button 8 are provided. Burner head 6
A thermistor 11 for detecting the temperature of the bottom of the pot is provided in the center of the thermocouple 12.
Are connected to the controller 13. Reference numeral 14 denotes a dry battery serving as a power supply for the controller 13. On the other hand, in the grill section 3, a pair of grill burners 15, 15 are arranged, and a gas valve 16 connected to the grill burners 15, 15 is also provided with a main valve 18 and a magnet safety valve 19 that can be opened by operating an ignition button 17. Is provided. A thermocouple 20 for detecting a flame is provided near the grill burner 15, and is also connected to the controller 13.

FIG. 2 is a circuit diagram of a safety valve control circuit 21 in the controller 13. The safety valve control circuit 21
Three PNP-type transistors Tr1 to Tr3 (hereinafter simply referred to as "Tr
1 "etc. ), And Tr2 and Tr3 serving as energizing transistors are arranged in parallel, and the magnet safety valve 10 on the stove side and the magnet safety valve 19 on the grill side are respectively provided.
And Tr1 as an original transistor is connected in series with Tr2 and Tr3. 23 is a microcomputer power supply V
_This is a power supply circuit for creating the _DD and the in-circuit power supply _VCC .
Furthermore, the microcomputer 22 is connected between the stove-side Tr2 and the magnet safety valve 10 and between the grill-side Tr3 and the magnet safety valve 19, respectively, to determine whether a voltage is applied to the magnet safety valve 10 or 19, respectively. It is possible to check whether or not.

The operation of the table stove 1 constructed as described above will be described with reference to the flowchart of FIG. When the operation button 8 is pressed, an igniter switch (not shown) is turned on in S1, and the microcomputer 22 that has detected the pressing operation of the operation button 8 turns on Tr1. Then, in S2, the main valve 9 and the magnet safety valve 10 are forcibly opened to supply fuel gas to the stove burner 4, and the igniter is activated to continuously discharge the ignition electrode (not shown) near the burner head 6. And S
Fired at 3. The burner 4 burns and the thermocouple 12
When the thermoelectromotive force of the sensor reaches the flame detection level or higher (S4), S
In 5, the pre-check is performed in the stove-side Tr2.
This is to check that no voltage is applied to the magnet safety valve 10, that is, that Tr2 is still OFF at this time. If the voltage is applied here, S
At 6, Tr1 is turned off as an ON failure of Tr2, and subsequent combustion is prohibited. On the other hand, if the pre-check in S5 is normal, Tr2 is turned ON in S7 and the magnet safety valve 1 is turned on.
Electricity is supplied to 0 to hold the valve open, and the combustion control is executed (S8).

Subsequently, no abnormality is found in the determination in S9, and
When the normal fire extinguishing operation is performed at 0, it is determined at S11 whether or not the grill burner 15 is burning. Here, if the grill burner 15 is burning, in S12, the burner Tr
2 is turned off, and a cutoff check is performed to check that no voltage is applied to the magnet safety valve 10 in S13. Here, if the voltage is still applied to the magnet safety valve 10, Tr1 is determined in S14 as ON failure of Tr2.
Is turned off to also extinguish the fire of the grill burner 15 and prohibit the subsequent combustion. On the other hand, if the cut-off check in S13 is normal, Tr1 is kept ON in S15 and the grill burner 1 is turned on.
The combustion of 5 is continued. On the other hand, in S11, grill burner 1
If No. 5 is not burning, that is, if only the stove section 2 is used alone, Tr1 is turned off in S16 and S1 is turned on in S17.
Perform the same shutdown check as in 3. If the voltage is still applied to the magnet safety valve 10, Tr2 is turned off in S18 as an ON failure of Tr1, and the subsequent combustion is prohibited. If the cutoff check in S17 is normal, Tr2 is turned off in S19.

Then, when the occurrence of an abnormality is confirmed in the determination of S9, in S20, the abnormality is a single abnormality in the stove section 2, for example, a high limit abnormality of the thermistor 11 (short circuit, short circuit,
Automatic fire extinguishing), disconnection or failure of thermistor 11, forgetting to extinguish stove or misfiring is determined. If these stoves are abnormal, it is determined in S11 whether grill is burning again. If it is determined that the grill is burning, only the burner Tr2 is turned off in S12. Thereafter, a cutoff check is similarly performed in S13, and if it is normal, the Tr1 is kept ON, so that the grill portion 3 can be used continuously (S1).
3-S15). If the grill is not burning, Tr1 is turned off and a cutoff check is performed (S16 to S1).
9). On the other hand, if it is determined in the step S20 that there is no abnormality in the stove section, it is determined that another circuit abnormality, for example, a circuit failure in the flame detection circuit or the thermistor circuit of the thermocouple 11, etc. Ban. Therefore, when the grill burner 15 is simultaneously burning, Tr3 is also OF.
Since the magnet safety valve 19 is closed by pressing F, the grill portion 3 becomes unusable.

As described above, according to the above embodiment, the safety valve control circuit 21 is provided for each of the magnet safety valves 10 and 19, and the energizing transistors Tr arranged in parallel with each other.
2, Tr3, Tr connected in series with Tr2, Tr3
1 and a microcomputer 22 capable of ON / OFF control of each of Tr1 to Tr3.
2, the combustion stop of only the heating unit 2 by turning off any of Tr3 and the combustion stop of the whole appliance by turning off Tr1 can be selected. The use of the entire portion 3 is prohibited and the safety is ensured, and in the event of an abnormality related to the stove portion 2, the use of only the stove portion 2 is prohibited and the use of the grill portion 3 is allowed, thereby improving the usability.

Further, according to the above embodiment, the safety valve control circuit 21 is similarly formed by the three transistors Tr1 to Tr3, and the energization checking means (S5, S13, S13) for checking the energization state of each of the magnet safety valves 10, 19. S
17), and either Tr2 or Tr1 is OF
By checking the energized state of the magnet safety valve 10 at the time of F, the failure of the other transistor can be detected, so that the circuit failure of the safety valve control circuit 21 itself can be reliably detected and safety is improved. I do. Further, the number of transistors can be reduced as compared with the conventional case, the configuration of the safety valve control circuit 21 can be simplified, and cost reduction can be achieved.

In the above embodiment, the first and second aspects of the present invention have been described by taking the stove as an example.
As described above, only the opening / closing control and the energization check are performed between Tr1 and Tr3, but the contents of the control and the operational effects are the same. Further, in the above embodiment, the table stove provided with the stove portion and the grill portion as the combustion portion is illustrated, but the present invention is similarly applicable to a case where only a plurality of stove portions are provided. is there.

[0015]

According to the first aspect of the present invention, the safety is ensured by prohibiting the use of all the combustion parts in the case of a circuit abnormality relating to the entire appliance, and the combustion is prevented in the case of an abnormality relating to an individual combustion part. The use of only other parts is prohibited, and the use of other parts is allowed, and the usability is improved. According to the second aspect of the invention, in addition to the effect of the first aspect, the energization checking means is provided to check the energization state to the safety valve when either the energizing transistor or the original transistor is turned off. By doing so, it is possible to reliably detect a circuit failure of the safety valve control circuit itself that can detect a failure of the other transistor, further improving safety and simplifying the configuration of the safety valve control circuit. According to the second aspect of the present invention,
Circuit failure of the safety valve control circuit itself can be reliably detected, and safety is improved. In addition, the number of transistors can be reduced as compared with the related art, so that the configuration of the safety valve control circuit can be simplified, and cost reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic view of a table stove.

FIG. 2 is a circuit diagram of a safety valve control circuit.

FIG. 3 is a flowchart showing the operation of the cooking stove;

FIG. 4 is a flowchart showing the operation of the grill section.

[Explanation of symbols]

1. Table stove, 2. Stove part, 3. Grill part, 4. Stove burner, 10, 19, Magnet safety valve, 13, Controller, 15, Grill burner,
21 safety valve control circuit, 22 microcomputer, Tr1
Tr3 transistor.

Claims (3)

[Claims] 1. A plurality of combustion sections, a safety valve provided in a gas supply path to the combustion section, a safety valve control circuit for controlling the opening and closing of the safety valve, an abnormality in the combustion section, and a circuit abnormality relating to the entire appliance. The safety valve control circuit, provided for each safety valve of each of the combustion units, and energizing transistors arranged in parallel with each other, Connected in series with the current-carrying transistor
One of the current-carrying transistors, the current-carrying transistor and the current-carrying transistor being configured to be ON / OFF-controllable by each of the current-carrying transistors according to the type of abnormality detected by the abnormality detection means. A combustion appliance characterized in that it is possible to select between stopping the combustion for each of the combustion units by turning off the combustion unit and stopping the combustion of the entire appliance by turning off the original transistor. 2. An energization check means for checking the energization state of each safety valve is provided, and when either the energization transistor or the source transistor is turned off, the energization check means checks the energization state to the safety valve. The combustion device according to claim 1, wherein a failure of the other transistor can be detected. 3. A combustion apparatus comprising: a plurality of combustion sections; a safety valve provided in a gas supply path to the combustion section; and a safety valve control circuit that controls opening and closing of the safety valve. Are provided for each safety valve of each of the combustion sections, and are arranged in parallel with each other, and are connected in series with the energizing transistors.
The current source transistor or the source transistor, comprising: a source transistor; an energization control unit capable of controlling ON / OFF of the energization transistor and the source transistor; and an energization check unit for checking an energization state of each safety valve. A burn-in device wherein a failure of the other transistor can be detected by checking the energization state of the safety valve by the energization check means when any one of the two is OFF.