JPH07101095B2 - Safety equipment for gas appliances - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a gas appliance safety device,
In particular, the present invention relates to a safety device such as a gas stove in which a monitoring condition for safe operation can be selected by an electric type monitoring device depending on whether the cooked food is heated or the fried food is heated. The present invention relates to a so-called child lock device that prevents inadvertent start of combustion due to mischief by operating a section.

[0002]

2. Description of the Related Art In a gas appliance such as a gas stove, a gas cock is used for heating control, and in order to realize the above child lock, the operation of the gas cock is
A so-called push-pull mechanism is employed in which the push-pull mechanism is pushed once in the axial direction and then rotated by a certain angle. As a result, it is possible to eliminate the inconvenience that the operating portion of the gas cock is inadvertently rotated as it is and the gas appliance is in a burning state.

However, in a gas stove of a type that enables heating of simmered food and heating of fried food and prevents overheating in both states, that is, heating of simmered food prevents sticking and that of fried food overheats oil. The overheated state is monitored by an electric device. Further, it is necessary to make the set temperature for the overheat prevention operation different between the boiled food heating and the fried food heating. In such a type of instrument, the adoption of the pushing mechanism has a problem in that the cost of the entire instrument is affected and the rationalization of the overall configuration of the instrument is insufficient.

According to the present invention, "the burner (B) is ignited by the operation of the ignition device associated with the opening operation of the gas cock (C), and the heat power is adjusted by adjusting the opening of the gas cock (C).
An overheat prevention device was installed to stop the combustion of the burner (B) when the heated container reached a predetermined overheat temperature, and the operating conditions of the overheat prevention device were different between the cooked state and the fried food heating state. It is an object of the present invention to realize a child lock in a "gas appliance" without the push-pull operation of the gas cock.

[0005]

[Technical Means] The technical means of the present invention for solving the above-mentioned problem is to provide a "switch (S) for switching the operating temperature of the overheat prevention device, and switch the gas cock (C) when it is fully closed. First to detect that the switch (S) is pressed
Detection means, and a second waiting means for detecting the re-operation of the changeover switch (S) by the output of the first detection means.
When the detecting means and the second detecting means are in the output state and the gas cock (C) is operated to open, the ignition device is brought into conduction, and the gas cock opens to open the burner (B ) Is held in the open state, but unless it is ignited, a safety valve that automatically closes when the operating force is released is incorporated. ”

[0006]

The above technical means operates as follows. When the gas cock (C) is fully closed, leave it
When (C) is opened, the burner (B) is ignited by the ignition device that works in conjunction with it, and then the burner is heated according to the opening of the gas cock (C), and the cooked food is heated by operating the selector switch (S). And either the fried food heating becomes a heating state, and the changeover switch (S) causes the overheat prevention device to operate at the corresponding set temperature.

When the appliance is not in use, the gas cock (C) is in a fully closed state, and when the changeover switch (S) is pushed in this state, the first detecting means detects this and the second detection is made by the output thereof. The means is on standby to detect the re-operation of the changeover switch (S). Therefore, in this state the gas cock
Even if (C) is opened, the second detector is not in the output state, so the ignition device is not conducting and the ignition operation is not executed. Then, when the operating force of the gas cock (C) is released,
The gas circuit in the gas cock (C) is automatically shut off by the safety valve built in this.

In using the device thereafter, the changeover switch (S) is operated again. As a result, the second detection means enters the output state and the ignition device is turned on when the gas cock (C) is opened, and the ignition operation is executed. And burner (B)
When is ignited, the safety valve opened by the opening operation of the gas cock (C) is held in the open state and the subsequent operation is started. Then, by operating the change-over switch (S), the system is put on standby in an overheat prevention state corresponding to either heating of simmered food or heating of fried food.

[0009]

[Effect] When the gas cock (C) is in the fully closed state, that is, when the selector switch (S) is operated when the equipment is not in use, the gas cock (C) is operated unless the selector switch (S) is operated again. Does not ignite the burner (B), and when the operating force of the gas cock (C) is released, the gas circuit in the gas cock (C) is automatically shut off by the safety valve, so inadvertent heating operation due to mischief can be prevented. .

[0010]

Embodiments of the present invention described above will now be described in detail with reference to the drawings. In this embodiment, as shown in FIG. 1, when the power is turned on, the overheat prevention device (7) is turned on, and the gas cock
The ignition device is activated by the switch (60) which is linked to the operation of (C).
(6) operates, and the operating temperature of the overheat prevention device (7) is switched by the changeover switch (S). Two types are set: a temperature (first set temperature) and a temperature (second set temperature) when the heated container is in an abnormally superheated state during heating of the fried food. Also, the gas cock (C) incorporates the misfire safety device shown in the figure.

The structure of this gas cock (C) is already well known, and a cam mechanism that interlocks with the closure (10) of the gas cock.
The safety valve (12) is opened and closed by (11), and a valve seat (13) is formed on the upstream side of the closure (10) built in the body (1) of the gas cock (C). The safety valve (12) faces each other. One end of the valve shaft (14) of the safety valve (12) is connected to the cam mechanism (1
An iron piece (15) is attached to the other end of the output section of (1) and faces the electromagnet (M) built in the main body (1). The safety valve (12) is normally urged in the valve closing direction by the spring (16).

The cam mechanism (11) is of a type that returns to its initial position when the output part of the cam mechanism (11) moves to the safety valve (12) side due to the opening and turning of the closure (10) and the opening and turning operation force is released. There is a known configuration. By adopting the cam mechanism (11), the safety valve (12) opens when the closing (10) is rotated, and the iron piece (15) is contacted with the electromagnet (M) to release the operating force. (1
The valve is closed and restored by 6).

The coil (21) of the electromagnet (M) is inserted in the circuit of the thermocouple (2) facing the flame hole of the burner (B) connected to the downstream side of the gas cock (C). A quick hold circuit (22) is connected in parallel to this thermocouple circuit. In this embodiment, the burner (B) has an annular combustion section, and the temperature sensing element (3) is provided in the space inside the combustion section.
Has been deployed. This thermosensitive element (3) is for sensing the temperature of this container by contacting the heated container placed on the virtue so as to face the burner (B).
The output from (3) is input to the control device (4), and the output from this control device (4) causes the drive circuit (6) of the ignition device (6).
1) and the operation of the output part of the overheat prevention device (7) are controlled.
The overheat prevention device (7) switches the output from the first setting device (71) that sets the operating temperature when heating the cooked food and the second setting device (72) that sets the operating temperature when heating the fried food. switch
The control device (4) compares the output from the thermosensitive element (3) with the set value, and the comparison result indicates the circuit of the thermocouple (2). To coil
It activates a normally closed output switch (23) inserted in series with (21). Therefore, this normally closed output switch (23)
Functions as the output of the overheat protection device (7).

The control device (4) of this embodiment uses a microcomputer, and its control program will be described with reference to the flow chart shown in FIG. When the power is turned on and this control program is activated, it is determined in step (80) whether the switch (60) is "off". This determines whether the gas cock (C) is in the fully closed state. Then, it is determined in step (81) whether the changeover switch (S) has been operated.

When the changeover switch (S) is not operated, the process proceeds to step (82) for judging whether the switch (60) is "on", and the switch (60) is "on". The drive circuit (61) and the quick hold circuit (22) are turned on. When the drive circuit (61) is turned on, the ignition device (6) is activated to ignite the burner (B). still,
Here, the switch (60) is interlocked with the operating shaft of the gas cock (C), and the operating shaft, that is, the opening of the closing member (10) after the time when it is rotated 11 degrees from the fully closed position. It is in the "on" state in the moving range (the range in which gas flows downstream of the closure (10)). The angle (11 degrees) is determined by the dimensional relationship between the downstream end of the passage hole of the closure (10) and the outlet of the main body (1).

The quick hold circuit (22) supplies a constant level of current to the circuit of the thermocouple (2) for a predetermined time and temporarily maintains the electromagnet (M) in an operating state. is there. When the gas cock (C) is operated, the cam mechanism
When the safety valve (12) opens due to the action of (11) and the iron piece (15) contacts the electromagnet (M) and releases the operating force, the spring (16) automatically closes the safety valve (12), but When the operating force is released when (10) is at the opening (the opening of 11 degrees or more) that supplies gas to the downstream side, the electromagnet is temporarily moved by the current supplied from the quick hold circuit (22). (M) is an iron piece
The safety valve (12) is kept open by adsorbing and holding (15), and the burner (B) continues to burn. And during this time the thermocouple
When (2) is heated and a predetermined thermoelectromotive force is generated in the thermocouple (2) circuit, the electromagnet (M) attracts the iron piece (15) even if the current supply by the quick hold circuit (22) is cut off. The held state is maintained, and the safety valve (12) is kept open.

After that, the heating prevention state previously selected by the changeover switch (S) is maintained. That is, the changeover switch (S) is changed to the first setting device (71) by the step (83).
Or, it is determined which of the second setting device (72) is connected, and when the changeover switch (S) is connected to the first setting device (71) side, the first setting is made in step (84). Bowl (71)
The output of the thermosensitive element (3) is compared with the output of the thermosensitive element (3) to wait for monitoring whether or not the heated container has risen to the vicinity of the focus temperature of the boiled food. The closed output switch (23) is turned off, the circuit of the coil (21) is opened, the safety valve (12) is closed, and the combustion of the burner (B) is stopped.

On the other hand, the changeover switch (S) is the second setting device (7
If it is connected to the 2) side, by the step (87),
The output of the heat sensitive element (3) is compared with the output of the second setting device (72) to wait for the condition to monitor whether the heated container is overheated, and the setting of the second setting device (72). The combustion of the burner (B) is stopped in the same manner when the temperature exceeds the overheated state. After that, when the gas cock (C) is returned to the fully closed position, this is judged in the step (85), and when the switch (60) is turned off, the process returns to the step (81).

The above is the operation during normal use, but in order to establish the child lock state, the changeover switch (S) is operated when the gas cock (C) is in the fully closed state. As a result, in step (81), it is determined that the changeover switch (S) has been operated when the gas cock (C) is in the fully closed state, and the process proceeds to step (86). In this step, it is monitored whether the changeover switch (S) has been operated again.In this state, even if the gas cock (C) is operated and the switch (60) is turned on, the changeover switch (S) Does not move to step (82) unless is re-operated.

That is, in the child lock state, the ignition device (6) does not operate even if the gas cock (C) is operated.
The safety valve (12) built into the gas cock (C) automatically closes when the operating force is released.
After the operation of (C), the gas circuit in the gas cock (C) is cut off. In the above configuration for bringing into the child-lock state, the combination of step (80) and step (81) corresponds to the first detection means in the section of technical means described above,
(86) corresponds to the above-mentioned second detecting means.

In this embodiment, when it is determined in step (81) that the change-over switch (S) is not operated again, the indicator lamp is lit so that the child lamp is locked by this indicator lamp. You can judge that. Although the control device (4) is a microcomputer in this embodiment, it may be a sequence control circuit.

In the above embodiment, the ignition device (6) and its driving device (61) are operated by the switch (60). However, in the normal ignition operation, the operating portion of the gas cock (C) is suddenly changed. Since it is rotated to the final position, a switch for operating the drive circuit (61) near the final position may be provided separately from the switch (60). Further, only the operation knob may be configured to return and rotate by a certain angle when the operation force of the operation knob of the gas cock is released, and the operation of the ignition device (6) may be stopped by the return and rotation. In this case, if the operating force is kept applied to the operating knob of the gas cock, the ignition device (6) continuously operates during that period.

[Brief description of drawings]

FIG. 1 is an overall explanatory view of an embodiment of the present invention.

FIG. 2 is a flowchart of a control program when the control device (4) is a microcomputer.

[Explanation of symbols]

 (C) ・ ・ ・ Gas cock (B) ・ ・ ・ Burner (S) ・ ・ ・ Changeover switch

Claims (1)

[Claims] 1. The burner (B) is ignited by the operation of an ignition device associated with the opening operation of the gas cock (C), and the heating power is adjusted by adjusting the opening degree of the gas cock (C) so that the heated container is heated to a predetermined temperature. Provided with an overheat prevention device for stopping the combustion of the burner (B) when the temperature reaches, in a gas appliance in which the operating conditions of the overheat prevention device are different between a cooked food heating state and a fried food heating state, Provided with a changeover switch (S) for changing the operating temperature, the first detection means for detecting that the gas cock (C) is fully closed and the changeover switch (S) is pressed, and the output of this first detection means By means of a second detecting means which stands by in a state of detecting the re-operation of the changeover switch (S) and an ignition device when the second detecting means is in an output state and the gas cock (C) is opened. And the gasco When the burner (B) is ignited by the opening and rotating operation and the burner (B) is ignited, it is kept in the open state, but unless it is ignited, a safety valve that automatically closes when the operating force is released is built in. Safety equipment for gas appliances.