JP2500301B2 - Control device for combustion device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a commercial AC power supply for a combustion device such as a stove, and a control device that operates by energization from another power supply.

[0002]

Conventionally, the electromotive force of the thermocouple generated <br/> Ri by the temperature of the burner of the combustion flame is determined by the control circuit, it is energized the electromagnetic safety valve (safety valve) in the control circuit Has proposed a control device for a combustion device that opens and closes a fuel supply path to a burner. The control device of this combustion device normally energizes the electromagnetic safety valve and holds the valve open only when the control circuit determines that the electromotive force of the thermocouple has risen above a predetermined value.

[0003]

However, in the prior art, when a power failure occurs, the electromagnetic safety valve is not energized and therefore is not held open, so the fuel supply path is not opened and combustion cannot be performed by the burner. There were challenges.
For this reason, for example, in a combustion device such as a cooking stove, there is a problem that heating and cooking cannot be performed during a power failure.

An object of the present invention is to provide a control device for a combustion device that can burn with a burner even in the event of a power failure.

[0005]

According to a first aspect of the present invention, there is provided a burner for burning fuel, a fuel supply passage for supplying the fuel to the burner, and a fuel supply passage arranged in the fuel supply passage.
An electromagnetic safety valve that keeps open when energized and closes when deenergized, operating means for manually forcibly opening this electromagnetic safety valve, and energizing and energizing the electromagnetic safety valve
Safety valve drive circuit for controlling the stop of the burner, a thermocouple disposed facing the flame port of the burner and generating an electromotive force according to the temperature of the combustion flame of the burner, and the electromagnetic safety valve.
A normal power supply circuit in which the safety valve drive circuit and the safety valve drive circuit are connected in series.
And a closed circuit, the electromagnetic safety valve and the thermocup
And a power supply circuit for a power outage that connects the
It is installed in the circuit and when it is energized
Opens and closes the power supply circuit at the time of power failure when power supply is stopped
Opening and closing means, and energizing and stopping energization to this opening and closing means
Control device for a combustion device, including a drive circuit for controlling opening / closing means
However, during normal times, the communication from the opening / closing means drive circuit is
The power supply circuit at the time of power failure by operating the opening / closing means by electricity.
Open and open the electromagnetic safety valve from the safety valve drive circuit.
The valve is held open by electricity, and in the event of a power failure, the opening / closing means drive circuit
When the power is cut off by operating the opening / closing means by stopping the energization of
Close the power supply circuit and connect the electromagnetic safety valve to the thermocouple.
The technical means of holding the valve open by the electromotive force of is adopted.

The invention as defined in claim 2 is as set forth in claim 1.
In addition to the control device for the combustion device, as the opening and closing means,
A normally closed relay switch connected to the power supply circuit at the time of power failure , and a relay coil that opens the relay switch when energized are provided.

The invention as defined in claim 3 is as defined in claim 2.
In addition to the control device for a combustion apparatus, the switching means drive circuit
As such , a relay drive circuit for controlling energization and de-energization of the relay coil is provided. Then, the relay drive circuit, especially to stop the energization of the relay coil after energization predetermined time has elapsed since the stop
To collect.

[0008]

According to the first aspect of the present invention, when the electromagnetic safety valve cannot be energized and the electromagnetic safety valve cannot be energized, the opening / closing means closes the power supply circuit at the time of the power failure. Therefore, the electromagnetic safety valve and the thermocouple form a closed circuit. Therefore, the fuel is burned by the burner by manually operating the operating means to perform ignition while the electromagnetic safety valve is forcibly held open. While the burner is in the combustion state, the electromagnetic safety valve is energized by the electromotive force of the thermocouple, so that the valve is held open and the fuel is continuously supplied to the burner, so that the combustion of the fuel is continued in the burner.

According to a second aspect of the present invention, there is provided a power supply circuit during a power failure for connecting the electromagnetic safety valve and the thermocouple by opening the normally closed relay switch when the switching means drive circuit energizes the relay coil. be opened. When the opening / closing means drive circuit stops energizing the relay coil, the normally closed relay switch is closed and the power supply circuit is closed at the time of power failure .

According to the third aspect of the present invention , when a power failure occurs during combustion of the burner, the relay drive circuit stops energizing the relay coil after a lapse of a predetermined time after the energization is stopped. Therefore, by delaying the closing timing of the normally closed relay switch, the closing timing of the power supply circuit at the time of power failure is delayed. Therefore, even when an electromotive force is generated in the thermocouple due to combustion of the burner, energization from the safety valve drive circuit to the electromagnetic safety valve is stopped first, so the electromagnetic safety valve is closed and the fuel supply path is closed. It is extinguished by a fire.

[0011]

According to the first aspect of the present invention, since the burner can perform combustion even in the power failure state, it is possible to solve the problem that the burner cannot heat and cook for a long time.

According to the second aspect of the present invention, the normally-closed type relay switch that operates by energizing the relay coil is used as the opening / closing means, so that it always acts on the side that closes the power supply circuit at the time of power failure at the time of power failure. be able to.

According to the third aspect of the present invention, the fire can be extinguished even when a power failure occurs while the fuel is burning in the burner.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A control system for a combustion apparatus according to the present invention will be described based on an embodiment shown in FIGS. FIG. 1 is a main electric circuit diagram of the gas stove, and FIG. 2 is a schematic diagram showing a gas supply path incorporated in the gas stove.

The gas stove 1 includes a gas burner 2, a gas supply passage 3, an ignition device 4 and an electric circuit 5. The gas burner 2 burns a mixture of gaseous fuel and combustion air (hereinafter referred to as fuel gas). A thermocouple (thermocouple) 21 is attached to the gas burner 2 so as to face the flame mouth of the gas burner 2. The thermocouple 21 generates thermoelectromotive force (thermal voltage) corresponding to the temperature of the combustion flame generated in the gas burner 2.

The gas supply passage 3 is the fuel supply passage of the present invention and is a passage for supplying the fuel gas to the gas burner 2.
The gas supply path 3 is provided with an electromagnetic safety valve 31, a manual main valve 32 and a throttle 33.

The electromagnetic safety valve 31 is a conventionally known one which is composed of an electromagnetic coil (not shown), a valve body (not shown) and the like. When manually pressed, the valve body is displaced to supply gas. The passage 3 is opened, and the valve is held open when energized in this state, and closed when the energization is stopped.

The manual main valve 32 is composed of a valve body (not shown) and the like, and when manually pressed, the valve body is displaced to open and close the gas supply passage 3. The throttle 33 is a portion that throttles the flow rate of the fuel gas.

The ignition device 4 comprises a fire extinguisher button 41, an igniter (not shown) and the like. The point fire extinguisher button 41 is an operating means of the present invention, and is a push-push type equipped with a conventionally known heart cam mechanism. When the point fire extinguishing button 41 is pressed during ignition, the electromagnetic safety valve 31 and the manual main valve 32 are opened, and the manual main valve 32 is held open at the intermediate position by releasing the pressing.

When extinguishing the fire, the manual main valve 32 is closed by releasing the lock at the intermediate position by re-pressing the point extinguishing button 41 and releasing it. The igniter is arranged so as to face the flame outlet of the gas burner 2, and ignites the fuel gas when the point extinguishing button 41 is pressed during use.

The electric circuit 5 will be described later as an electromagnetic safety valve 31 .
A normal power supply circuit that connects the safety valve drive circuit 57 in series
Power supply circuit 50, electromagnetic safety valve 31 and thermocouple 21 connected in series as a closed circuit 51 as a power supply circuit during a power failure , a relay 52 for opening and closing the closed circuit 51, and energization and energization of the electromagnetic safety valve 31 and the relay 52. It has an energization control circuit 53 for controlling the stop and the like.

The relay 52 is the opening / closing means of the present invention, and is a normally closed relay switch 54 and a relay coil 55.
Have. When closed, the relay switch 54 connects the thermocouple 21 and the electromagnetic safety valve 31 to close (form) the closed circuit 51.

When the relay switch 54 is opened, the connection between the thermocouple 21 and the electromagnetic safety valve 31 is cut off to open the closed circuit 51. The relay coil 55 opens the relay switch 54 when energized and closes the relay switch 54 when energized.

The energization control circuit 53 includes an ignition detection circuit 56,
It has a safety valve drive circuit 57, a relay drive circuit 58 and a microcomputer 59. The ignition detection circuit 56 sends a signal to the microcomputer 59 when the electromotive force of the thermocouple 21 rises above a predetermined value.

The safety valve drive circuit 57 includes an ignition detection circuit 56.
When a signal is output from the microcomputer 59 in response to the signal from the electromagnetic safety valve 31, the electromagnetic safety valve 31 is energized via the power supply circuit 50 . Further, when no signal is received from the ignition detection circuit 56 due to a misfire or the like, the signal from the microcomputer 59 is stopped and the energization of the electromagnetic safety valve 31 is stopped.

The relay drive circuit 58 is the opening / closing means of the present invention.
In the drive circuit, the ignition switch 41 is ignited and the relay coil 55 is energized when a signal is output from the microcomputer 59. Further, the relay drive circuit 58 is provided with a timer such as a capacitor, performs a fire extinguishing operation by a power failure or a point fire extinguishing button 41, and energizes the relay coil 55 after a predetermined time has elapsed since the signal from the microcomputer 59 was stopped. To stop. The microcomputer 59 operates when supplied with power from a commercial AC power supply (not shown).

The operation of the gas stove 1 is shown in FIGS. 1 and 2.
It will be described based on. When burning with the gas burner 2 during a power failure, first, the point fire extinguishing button 41 is manually pressed. Then, the electromagnetic safety valve 31 and the manual main valve 32 are forcibly opened, and the gas burner 2 passes through the gas supply passage 3.
Is supplied with fuel gas.

When the user ignites with a match or a lighter, combustion is started in the gas burner 2 and the thermocouple 21 is heated by the heat of the combustion flame generated in the gas burner 2.
Generates electromotive force.

Since there is no power outage, no signal is output from the microcomputer 59 to the relay drive circuit 58, so that the relay coil 55 is not energized. Therefore, by closing the relay switch 54, a closed circuit 51 that connects the electromagnetic safety valve 31 and the thermocouple 21 in a ring shape is formed.

As a result, since the electromagnetic safety valve 31 is energized by the electromotive force of the thermocouple 21, the electromagnetic safety valve 31
The electromagnetic safety valve 31 is released even if the user releases the pressing of the fire extinguisher button 41 after reaching a predetermined electromotive force required to hold the valve open.
Is held open, and the manual main valve 32 is locked in the open position by the heart cam mechanism.

Therefore, the gas burner 2 is connected to the gas supply passage 3
Since the fuel gas is continuously supplied from, the combustion is continued in the gas burner 2. That is, in this embodiment, since the gas burner 2 can perform combustion even in the power failure state, heating and cooking can be performed even when the power failure state continues for a long time. Note that the thermocouple 21 does not generate an electromotive force if a misfire occurs during use during this power outage, and the electromagnetic safety valve 3
No. 1 is not energized and the valve is closed, and the supply of fuel gas is stopped.

When a power failure occurs during heating and cooking by the gas burner 2, the electric circuit 5 is de-energized, and therefore the signal from the microcomputer 59 to the relay drive circuit 58 is stopped. At this time, the relay drive circuit 58 keeps energizing the relay coil 55 until a predetermined time elapses by a timer such as a capacitor.

During this period, the signal from the microcomputer 59 is not output to the safety valve drive circuit 57, and the electromagnetic safety valve 3
The energization of 1 is stopped and the electromagnetic safety valve 31 is closed. Therefore, the gas supply passage 3 is closed, the supply of the fuel gas to the gas burner 2 is cut off, and the fire is surely extinguished. That is, when the gas burner 2 is heating and cooking, it operates on the safe side when a power failure occurs.

(Modification) In this embodiment, a relay is used as the switching means, but a semiconductor switching element such as a transistor may be used. In this embodiment, the gas fuel is used as the fuel, but a liquid fuel such as kerosene may be used.

The power failure state includes not only the case where the supply of the AC current from the commercial AC power supply is stopped but also the case where the dry battery is removed.

In this embodiment, the electromagnetic safety valve is forcibly opened only manually and the valve is kept open by energization. However, the electromagnetic safety valve is forcibly opened and opened by either energization or manual operation. You may use what hold | maintains a valve by energizing. In this case, the electromagnetic valve for forced valve opening is often provided separately from the electromagnetic coil for holding the valve open.

In this embodiment, the ignition detection circuit sends a signal to the microcomputer when the electromotive force of the thermocouple is equal to or more than a predetermined value, and the microcomputer sends a signal to the safety valve drive circuit in response to this. , The signal may be sent to the microcomputer when the electromotive force has a time gradient, that is, when the value of the electromotive force is not in a downward trend. The signal an ignition detecting circuit according to the magnitude of the electromotive force is transmitted to the microcomputer, the microcomputer analyzes the signal, it may be determined a signal transmission to the safety valve drive circuit.

[Brief description of drawings]

FIG. 1 is a main electric circuit diagram of a gas stove adopting the present invention.

FIG. 2 is a schematic view showing a gas supply passage incorporated in a gas stove.

[Explanation of symbols]

1 Gas Stove 2 Gas Burner (Burner) 3 Gas Supply Channel (Fuel Supply Channel) 21 Thermocouple 31 Electromagnetic Safety Valve 41 Point Fire Extinguishing Button (Operating Method) 50 Power Supply Circuit (Normal Power Supply Circuit) 51 Closed Circuit (Power Supply Circuit During Power Failure ) 52 Relay (Opening and closing means) 53 Energization control circuit 54 Normally closed relay switch 55 Relay coil 57 Safety valve drive circuit 58 Relay drive circuit (opening and closing means drive circuit)

Claims (3)

(57) [Claims] 1. A burner for burning fuel, (b) a fuel supply passage for supplying the fuel to the burner, and (c) a fuel supply passage provided in the fuel supply passage for holding the valve open when energized. Then, an electromagnetic safety valve that closes when the energization is stopped, (d) an operating means for manually forcibly opening the electromagnetic safety valve , and (e) control of energization of the electromagnetic safety valve and stop of energization
A safety valve drive circuit, (f) is disposed to face the flame hole of the burner, said a thermocouple which generates an electromotive force corresponding to the temperature of the combustion flame of the burner, and (g) the electromagnetic safety valve safety valve Connect to drive circuit in series
The continuous normal power supply circuit, and (h) a closed circuit, and the electromagnetic safety valve and the thermostat
A power supply circuit for a power failure in which pulls are connected in series, and (i) a power supply circuit provided in the power supply circuit for a power failure when energized
When the power supply circuit is opened during the power failure and the power supply is stopped, the power is stopped.
Opening / closing means for closing the power supply circuit during power supply, and (j) controlling energization and stoppage of energization to this opening / closing means
And a control device for a combustion device including an opening / closing means drive circuit.
Therefore, during normal times, the power is supplied from the opening / closing means drive circuit to
By opening and closing the power supply circuit at the time of power failure by operating the opening and closing means,
Open the electromagnetic safety valve by energizing the safety valve drive circuit.
In the event of a power failure , hold the
By operating the opening / closing means to close the power supply circuit at the time of power failure,
Open the electromagnetic safety valve by the electromotive force of the thermocouple.
A control device for a combustion device, which is characterized by being held . 2. The control device for a combustion device according to claim 1,
There are, the switching means, the normally closed relay switch connected to the power failure power feeding circuit, and opens the relay switch to be electrification control apparatus of the combustion device you further comprising a relay coil. 3. The control device for a combustion device according to claim 2,
The opening / closing means drive circuit is a relay drive circuit for controlling energization and stoppage of energization of the relay coil , and the relay drive circuit is configured to connect the relay coil to the relay coil after a predetermined time has elapsed since energization was stopped. control device for stopping the energization combustion device you characterized.