JPS6033425A - Safety device for combustion - Google Patents

Abstract

PURPOSE:To obtain the safety device eliminating the leakage of gas without deteriorating the operability of instruments when the mis-fire or non-ignition of a burner is generated by a method wherein a safety control unit, outputting a signal to close automatically a safety valve when there is no flame in the burner under a condition that a gas cock is opened, is equipped in the device. CONSTITUTION:The safety control unit 8 detects the opening of the cock 3 by a cock switch 9 and outputs the signal to close the safety valve 6 in case there is no signal from a combustion sensor 7 at this moment. The safety control unit 8 consists of a micro-computer 21, a sensor input circuit 22, a switch input circuit 23, a battery check circuit 24, a valve driving circuit 25, a valve check circuit 26, a buzzer driving circuit 27 and a ventilating fan driving output circuit 28.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a combustion safety device that automatically shuts off gas when a gas combustion appliance misignites or misfires.

Conventional structure and its problems In recent years, gas stoves and table stoves with a safety function that automatically closes the gas to prevent raw gas from leaking in the event of ignition errors or misfires have begun to appear on the market. . Figure 1 shows an example of a conventional gas staple stove. Gas is inlet 1
The gas flows through the safety valve 2 and the gas cock 3, and is ignited by an igniter (not shown) in the burner 4 to be combusted. 5 is a sensor for detecting the presence or absence of flame in the burner 4, which uses a thermocouple type thermoelement.

The safety valve 2 has a structure in which a stain magnet is energized by the four attractions generated by the thermoelement 2 to attract the valve. Generally, in order to ignite burner 4, the user must use cock 3.
Turn to flow gas and operate the igniter (not shown), and at the same time open the safety valve 2 by pressing the cock 3, and press the iron piece of the safety valve 2 against the electromagnet. As the burner 4 is ignited and the flame heats the element 5, an electromotive force is generated and the safety 5-beige valve 2 continues to open. When the burner 4 misfires for some reason, the electromotive force of the element 5 disappears, and the safety valve 2 is unable to attract the safety valve 2. The force of the internal spring causes the valve to close.

In this case, when opening the cock 3, it is necessary to press the cock 3 to open the safety valve 2 at the same time, and the time required for the burner 4 to ignite and the element 5 to generate an electromotive force (approximately 30 to 40 seconds) It becomes inconvenient to use because you have to keep pressing the cooker.If you still have a gas staple stove with 3 or 4 Uniburners 4, the system shown in Figure 1 requires as many configurations as the number of burners, which is complicated and expensive. become.

Furthermore, since the electromotive force of the element 5 is usually as low as several tens of mV, it is necessary to make the attracting surface between the electromagnet and the iron piece of the safety valve 2 highly precise, resulting in problems such as low manufacturing efficiency.

OBJECTS OF THE INVENTION The present invention improves the above-mentioned conventional problems and provides a safety device that eliminates gas leakage in the event of burner misfire or non-ignition without reducing the operability of the appliance. The purpose is to

Structure of the Invention In order to achieve the above object, the present invention provides a combustion sensor that detects the combustion flame of the burner, a safety valve that opens manually and self-maintains, and a switch that works with the gas cock. The structure includes a safety control section that outputs a signal to automatically close the safety valve when there is no flame.

DESCRIPTION OF EMBODIMENTS Examples of the present invention will be described below with reference to FIGS. 2 to 8.

FIG. 2 shows an embodiment of the combustion safety device of the present invention.

Gas flows from inlet 1 to safety valve 6 and gas cock 3, which will be explained later.
It passes through and burns in burner 4. At this time, the gas cock 3 may be in the form of pulp. The flame is detected by a combustion sensor 7 and sends a signal to a safety control section 8.

The safety control unit 8 outputs a signal to the safety valve 6 in response to a signal from the combustion sensor 7 and a signal from a cock switch 9 which generates an open/close signal for the gas cock 3 in conjunction with the gas cock 3 . Reference numeral 10 denotes a DC power source for driving the safety control section 6.

FIG. 3 shows an example of the safety valve 6.

Here, a self-adsorption type safety valve is shown using a permanent magnet 11. Normally, the valve 12 is pressed against the valve seat 14 by a spring 13 to prevent gas from flowing from the A chamber to the B chamber. By pressing the external button 15, the valve 12 causes the gas to flow from the A chamber to the B chamber from the valve seat 14. When the plunger 16 made of a magnetic material contacts the magnetic yoke 17, a magnetic circuit is formed between the permanent magnet 11, the yoke 17, and the plunger 16, and the plunger 16 overcomes the force of the spring 13 and is attracted to the button 15. Even if the pressing force is removed, the valve 12 continues to open. If a direct current is applied to the coil 18 to generate a magnetic field in a direction that cancels the magnetic force of the permanent magnet, the attraction force disappears, and the force of the spring 15 presses the valve 12 against the valve seat 14 to prevent gas from flowing in. The safety valve described above makes it possible to close the safety valve 6 when the safety control section 8 in FIG. 2 detects an abnormality.

Furthermore, this type of safety valve does not require constant energization to open the valve 12, but only requires instantaneous energization to close the valve, so it can withstand long-term use even if the DC power source 10 is a dry battery.

The safety valve 6 may have a ratchet type configuration as shown in FIG.

With the configuration shown in FIG.
It is detected that the cock 3 is opened, and if there is no signal from the combustion sensor 7 at this time, a signal is output to close the safety valve 6. The combustion sensor 7 may be one that detects the temperature of the flame or one that detects the ionic current of the flame.

Here, an example of a thermoelement using a thermocouple will be explained as in FIG. 1. Generally, this type of temperature sensor has a thermal time constant, and even if the burner 4 is ignited, there is a delay time until the sensor 7 outputs an output. It has a timer section that does not shut off the safety valve 6 even if there is no signal from the sensor 7 for a certain period of time.

Gas staple stoves often have two to four burners. FIG. 5 shows the case of 30 stoves. Page 9 states that one safety valve 6 is provided on the gas population 1 side. The safety control unit 8 includes cock switches 9a to 9c and combustion sensors 7a to 7 corresponding to the respective burners 4a to 4c.
c is checked, and the safety valve 6 is shut off only when there is no output from the combustion sensor 7a of the burner 4a whose cock is open, but it operates so as not to shut off even if there is no sensor output from the burner whose cock is not open. . Also here 9a
When a cock open signal is input from any of the cock switches 9c to 9c, a signal for driving an external ventilation fan 19 is output to ventilate the air. Furthermore, since the safety valve 6 is a self-adsorption valve, it continues to open even if the safety control section 8 does not operate, and even if the burner misfires at this time, the valve cannot be shut off. When a DC power source 10 is configured with a dry battery, a drop in battery voltage is detected and an output is output to automatically cut off the safety valve 6 before the voltage becomes below the limit for operating the safety valve 6. At the same time, when a cock open signal is input from each cock switch, it is detected that the power supply 10 is at a voltage that allows the safety valve 6 to operate, and the buzzer 20 notifies the operator. For example, if there is no power source 10, the user can determine this because there is no buzzer notification page 10.

Furthermore, the buzzer 20 also functions to notify a person by giving a warning for a certain period of time even when the safety valve 6 is shut off. Further, even if the cocks 3a to 3c are opened while the safety valve 6 is closed, the burner will not be lit for any length of time because gas will not flow. In order to prevent such a situation, the device is configured to detect whether the safety valve 6 is open or closed when the cocks 38 to 3c are opened, and to notify by the buzzer 20 even when the safety valve 6 is closed.

FIG. 6 shows the configuration of the safety control section 8. The safety control section 8 includes a microcomputer 21, a sensor input circuit 22, a switch input circuit 23, a battery check circuit 24, a pulp drive circuit 25, a pulp check circuit 26, a buzzer drive circuit 27, and a ventilation fan drive output circuit 28.

The sensor input circuit 22 compares the outputs of the combustion sensors 7a to 7c (here, thermocouple type thermoelements) with an internal reference potential, and inputs the outputs to the microcomputer 21 to determine whether each burner is in combustion. Vane force.

The switch input circuit 23 is connected to each switch input circuit 9a.
-9c is detected, and whether the cocks 3a-3C are open or closed is input to the microconbeater 21.

Here, when cock 3 is closed, Nui Fuchi 9 ONC
When the contact is connected to ground and the connector 3 is opened, N
Ground is connected to the o contact. At this time, the negative terminal of the battery 10 is connected to the No contact, so that when any cock is opened, the negative terminal of the battery 10 is connected to the ground terminal of the safety control unit 8, and power is supplied. ,
It doubles as a power supply switch and a cock switch.

The battery check circuit 24 detects the voltage of the battery 10 and sends a signal to the microconbeater 21 when the voltage falls below a certain level. In response to this, the microconbeater 21 shuts off the safety valve 6 and drives the buzzer 20.

The valve drive circuit 25 amplifies the signal from the microconbeater 21, momentarily energizes the coil (coil) v18 of the safety valve 6, and shuts off the safety valve 6.

The valve check circuit 26 is a circuit that checks whether the safety valve 6 is open or closed and sends a signal to the microconbeater 21. In order to have a nokuru check function, A configuration in which detection is performed using a contact that interlocks with the safety valve 6, a configuration in which detection is performed based on a difference in impedance flowing through the coil 18, or the like may be used.

The buzzer drive circuit 27 is a circuit that drives the buzzer 20 and includes an oscillator therein, and oscillates on and off based on the output of the microcomputer 21. Here, the buzzer drive circuit 27 may be configured to provide notification using a lamp.

The ventilation fan drive circuit 28 is a circuit that outputs a signal to automatically operate the ventilation fan 19 when the cable 3 is opened, and drives a relay etc. with the output of the microcomputer 21 to operate the ventilation fan 19.

FIG. 7 shows a specific example of the circuit shown in FIG. Parts that are the same as those in FIG. 6 are designated by the same numbers. The valve check circuit 26 is configured to detect a contact 6' connected to the safety valve 6. 08
C29 is an oscillator that generates a reference clock signal for the microconbeater 13 page (CPU) 21.

FIG. 8 shows an example of a flow chart of the basic program of the microcomputer 21. Although the example in which there is one burner 4 is shown here, the same concept may be applied even if there are a plurality of burners. In the figure, the ignition timer W is used to cover the response delay of the combustion sensor, and operates after the cock is opened, during which time the input from the sensor is ignored.

X's [buzzer output of 0.25 ecJ is the third one that checks whether the battery voltage is sufficient when each cock is opened and sounds the buzzer for 0.2 seconds each time it is operational.
This is the information department. This is because it does not alert when the voltage is not high enough to drive the buzzer or when you forget to insert the battery.
We can separate.

Y "one continuous buzzer" indicates a second notification section that notifies you until the safety valve is opened when the safety valve is shut off when the cock is opened. Z's "buzzer 10secj" indicates the first notification section that notifies when the safety valve performs a shutoff operation.

Page 14 In the above description, an example in which a microconbeater is used in the safety control section 8 has been described, but it may also be constructed using a discrete circuit.

The above embodiment has the following effects.

(1) Even if there are multiple gas burners, only one safety valve is required, resulting in an inexpensive and simple system configuration.

(2) Since the system is configured to use a buzzer to notify you of various conditions, the user can check even if he or she is far away.

(3) It is a fail-safe and safe system with functions to check the opening/closing of the safety valve and check for battery voltage drop.

(41) It also outputs a signal to automatically operate the ventilation fan, so the air is always kept clean.

Details of the invention As explained above, the present invention has the following effects.

(1) The user only needs to open the gas cock (there is no need to push the gas cock around like in the past, and there is no need to keep pushing until the electromotive force of the element is generated, so the user can simply open the gas cock with one-touch operation) 15 pages easy to use.

(2) High-precision machining is not required because the safety valve that is attracted by the electromotive force of the conventional thermoelement 1- is not used.

(3) Since the safety valve has a self-holding mechanism, no electric power is required to open and hold the valve, which saves power in the system and can be used with dry battery power.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional combustion safety device, Fig. 2 is a block diagram showing an embodiment of the combustion safety device of the present invention, Figs.
The figure is a block diagram showing an example of the safety valve in the same device, FIG. 5 is a block diagram showing another embodiment of the same device, FIG. 6 is a block diagram showing the structure of the safety control section in the same device, and FIG. FIG. 8 is a circuit diagram showing a specific example thereof, and is a flow diagram when a microconbeater is used in the same circuit. 3.3a, 3b, 3cm gas cock, 4°4a,
4 b, 4 c... burner, 6...
Safety valve, 7.7a, 7b, 7c... Combustion sensor, 8... Safety control section, 9, 9a, 9b
, 9c...Cock Suiki ζ, 8A switch (switch mechanism), 10...DC power supply (dry battery), 11...Permanent magnet (self-holding mechanism),
12... Valve, 17... Ventilation fan (ventilator), 18... Electromagnetic carp) V (Closing drive unit)
, 20...Buzzer, 24...Battery check circuit (battery check section), 26...Valve check input circuit (check operation section), W...
...Ignition timer (timer section), X...Third notification section, Y...Second notification section, Z...First notification section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4

Claims (1)

[Scope of Claims] (1) A burner that burns gas, a combustion sensor that detects the combustion flame of the burner, a gas cock installed in series in the gas passage leading to the burner, and a self-holding device that manually opens and holds the burner. It consists of a safety valve having a mechanism and a closing drive unit that closes the valve, and a safety control unit that drives the safety valve in response to a signal from the combustion sensor, and this safety control unit includes a switch that operates in conjunction with the gas cock. It has a timer section that operates when the gas cock is opened in response to a signal from the mechanism, and after the operation of the timer section is completed, the timer section receives a signal from the combustion sensor and closes the burner when the burner misfires or is in a non-ignition state. A combustion safety device configured to output a signal to the drive unit. (2) A plurality of burners are provided, and a gas cock is provided corresponding to each burner, and a safety valve is provided on the upstream side of the branch point of these gas passages, and The combustion safety device according to claim 1, wherein the safety valve is configured to send a signal from the combustion sensor and the switch mechanism of each gas cock to the safety control section. (3) The safety valve has a self-holding mechanism that attracts the valve with a permanent magnet. The combustion safety device according to claim 1 or 2, wherein the closing drive section includes an electromagnetic coil and a spring that act in a direction to cancel the magnetic force of the permanent magnet. The combustion safety device according to claim 1, wherein the control section includes a first notification section that notifies when the safety valve is activated by a signal from the combustion sensor. (5) The safety control section is , a check operation part that checks whether the safety valve is open when the gas cock opens based on a signal from a switch mechanism of the gas cock, and a second notification part that notifies when the safety valve is open or closed. The combustion safety device according to claim 1. (6) The safety control section is configured to be driven by a dry battery power supply;
- The combustion safety device according to claim 1, further comprising a battery check section that closes a safety valve when the voltage of the dry battery drops below a certain level. (7) The battery check section has a third notification section that detects and notifies that the voltage of the dry cell battery is below a certain level when the gas cock is opened in response to a signal from the switch mechanism of the gas cock. A combustion safety device according to claim 6. (8) Claim 4: The first notification section, the second notification section, and the third notification section are configured to notify by a buzzer.
The combustion safety device described in Section 5 or Section 7. (9) The safety control unit is configured to drive a ventilation device that ventilates indoor air when at least one gas cock is open in response to a signal from a switch mechanism of the gas cock. Combustion safety device.