JPH0339214B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a gas control device for safely igniting gas combustion appliances such as gas bathtubs and gas instantaneous water heaters.

[Prior Art] A conventional gas control device for controlling gas flow and ignition of a domestic gas combustion appliance has the following configuration.

A main burner side gas introduction path equipped with a main valve;
A normally-closed electromagnetic safety valve is provided in the upstream gas introduction path where the sub-burner side gas introduction path is branched from the sub-burner side gas inlet path equipped with a pilot valve, and a thermocouple facing the sub-burner and an igniter for the sub-burner are provided. A cam that opens and closes the safety valve, the pilot valve, and the main valve, respectively, is provided on the ignition operating shaft that operates the igniter, and the electromagnetic safety valve is opened by the action of at least one of the electromagnetic force and the cam, and the safety valve includes: When the electromotive force of the thermocouple facing the sub-burner rises to a predetermined value, a forced opening force of electromagnetic force is activated, and at the time of starting ignition, the electromagnetic force from the ignition power source is activated until the electromotive force of the thermocouple facing the sub-burner rises to the predetermined value. In a gas control device in which a forced valve opening force is applied, in the process of rotating the ignition operating shaft from a stop position to an open position,
First, the safety valve is opened by the action of the cam, the valve is kept open by the force of the cam, and the valve is kept open by the electromagnetic force from the power supply, and then each of the cams is opened so that the pilot valve opens. The shape is set, and the auxiliary burner is ignited by the igniter in response to opening of the pilot valve.

[Technical Problem] In the conventional gas control device configured as described above, the sub-burner is always kept ignited as a spark when the main burner is ignited again after the use of the main burner is stopped. In order to ignite this device, the rotation of the ignition operating shaft may be stopped while the ignition operating shaft is being operated from the stop position to the open position (with the pilot valve in the open state), or due to some reason. In the unlikely event that the ignition operating shaft stops rotating due to a malfunction, if the igniter's power supply voltage happens to drop, that is, if the battery is exhausted, the ignition function will be lost and the safety valve will close due to electromagnetic force. Although the forced opening force acting on the valve disappears, the safety valve and pilot valve remain open due to the action of the cam, so the secondary burner does not ignite and the secondary burner releases raw gas (unburned gas). This caused continued inconvenience.

That is, a normally closed electromagnetic safety valve (operated by the electromotive force of the power supply or thermocouple) is installed upstream of the two gas valves for the main burner and the sub-burner.
Conventional gas control devices that control the opening and closing of these three gas valves by the action of a cam attached to the ignition operating shaft suffer from a drop in power supply voltage because the shape of the cam was not designed appropriately. If the ignition control shaft was turned from the stop position to the open position and stopped rotating for some reason when the ignition could not be ignited, there was a risk that raw gas would continue to flow from the sub-burner.

The purpose of the present invention is to prevent the igniter from dropping when the power supply voltage of the igniter happens to be low, that is, when the battery is exhausted.
In the event that the user of the appliance stops rotating the ignition operating shaft while moving it from the stop position to the open position in order to ignite the ignition, or due to some other malfunction, the ignition operation may be interrupted. Even if the shaft stops rotating, by appropriately designing the shape of the cam attached to the ignition operating shaft and setting the ignition timing, the inconvenience of continuing to emit raw gas from the sub-burner that has not ignited can be avoided. An object of the present invention is to provide a gas control device that can prevent the above problems.

[Means for Solving the Problems] In order to achieve the above object, the gas control device of the present invention includes: a main burner side gas introduction path equipped with a main valve;
A normally-closed electromagnetic safety valve is provided in the upstream gas introduction path where the sub-burner side gas introduction path is branched from the sub-burner side gas inlet path equipped with a pilot valve, and a thermocouple facing the sub-burner and an igniter for the sub-burner are provided. A cam that opens and closes the safety valve, the pilot valve, and the main valve, respectively, is provided on the ignition operating shaft that operates the igniter, and the electromagnetic safety valve is opened by the action of at least one of the electromagnetic force and the cam, and the safety valve includes: When the electromotive force of the thermocouple facing the sub-burner rises to a predetermined value, a forced opening force of electromagnetic force is activated, and at the time of starting ignition, the electromagnetic force from the ignition power source is activated until the electromotive force of the thermocouple facing the sub-burner rises to the predetermined value. In a gas control device in which a forced valve opening force is applied, the safety valve is once opened by a cam during the process of rotating the ignition operating shaft from the stop position to the open position.
The valve is kept open by the electromagnetic force from the power source, and the cam closes the safety valve again.
The shapes of the cams are set so that the pilot valve opens, and the auxiliary burner igniter is started after the pilot valve is opened and the main valve is subsequently opened. What was established in a previous period is a technical measure.

[Operations and Effects of the Invention] (Operations) The gas control device of the present invention uses an appropriate cam shape to first operate the electromagnetic control shaft in the process of gradually rotating the operation knob from the stop position to the open position. The safety valve is mechanically opened by the action of a cam,
Next, the safety valve is forcibly kept open for a predetermined period of time by a power source, and then the mechanical valve-opening force once applied to the electromagnetic safety valve is lost due to the specific shape of the cam (which is the gist of the present invention). be exposed. If this mechanical valve-opening force is lost, the pilot valve may extinguish for some reason at any further rotational position, and the electromotive force of the thermocouple may drop below the specified value, or the battery may become exhausted and the power supply may be interrupted. The electromagnetic safety valve closes when the power from the valve falls below a predetermined value. On the other hand, during normal ignition operation when the electromotive force from the power source is above a predetermined value, the electromagnetic safety valve is kept open by the electromagnetic force even after the mechanical valve opening force due to the action of the cam is lost. The pilot valve is opened by the action, and then the auxiliary burner igniter is started.

As a final step, the main valve is opened as the cam rotates, the main burner is ignited by the sub-burner, and the gas combustion appliance enters the operating state.

(Effects) (1) Due to the improved shape of the cam in the above configuration, at the rotational position where the pilot valve of the ignition operating shaft is opened, the pilot valve will extinguish for some reason and the electromotive force of the thermocouple will fall below the specified level. If the ignition power supply voltage is low and ignition does not occur, both the valve-opening force due to electromagnetic force and the mechanical valve-opening force due to the action of the cam are lost, and the electromagnetic safety valve closes, preventing raw gas from flowing from the pilot valve. It has the effect of preventing the danger of release.

(2) Due to the limitations at the time of starting the sub-burner igniter in the above configuration, in the present invention, in the process of rotating the ignition operating shaft from the stop position to the open position, the safety valve once opened is The cam shape is set so that the pilot valve for the auxiliary burner is opened after the valve is closed again. By adopting a valve opening/closing mechanism with an improved cam shape, (the auxiliary burner igniter starts before the pilot valve opens).
If so, when you turn the ignition operating shaft back to the stop position to extinguish the fire, if for some reason the ignition operating shaft returns to the point before the pilot valve starts opening, it does not return to the ignition starting position and the ignition operating shaft changes midway. When the rotation of the igniter is stopped, the pilot valve and the main valve close to extinguish the fire, but the cam mechanism cannot ignite the igniter operating switch. Under this condition, if the ignition operating shaft is moved back in the direction of ignition, which is in the middle position as described above, the igniter will not work, but the safety valve will remain cool for a certain period of time due to the electromotive force from the thermocouple due to residual heat. Since the valve is kept open and the pilot valve and main valve are opened by the action of the cam, raw gas may be released for a certain period of time, but if the auxiliary burner igniter is started after the pilot valve is opened, When the ignition operating shaft is returned in the ignition direction, the igniter is activated and the pilot valve is ignited, thus preventing the release of raw gas.

That is, it has the effect of eliminating the conditions that cause raw gas to be released due to malfunction of the ignition operating shaft as described in the above-mentioned operation.

[Example] FIG. 1 is an electrical circuit diagram for operating the device of the present invention.

The capacitor 3 serves as a timer for energizing the battery power source 11 to keep the electromagnetic safety valve 1 open until the electromotive force of the thermocouple 2, which serves as the power source for keeping the valve open, reaches a required level after the auxiliary burner ignites. Function. Further, the capacitor 12 is connected to the igniter 13
When the power supply switch SW2 is turned on, the relay contact 15 for opening and closing the circuit interposed in this power supply circuit
It functions as a time-limited activation timer for the activation relay 14.

FIG. 2 is a conceptual diagram illustrating the arrangement of the main components of the device of the present invention.

17 is a discharge part of the igniter 13, 18 is an auxiliary burner, and 19 is a main burner. Further, 1 is an electromagnetic safety valve provided at a gas introduction part to the apparatus, 4 is a main valve for the main burner, and 5 is a pilot valve for the sub-burner.

FIG. 3 is an operation time chart of the main components.

FIG. 4 is a front view of the ignition operating shaft knob showing the rotation range of the knob.

5 to 8 depict the shape of the cam of the device of the present invention and the structure showing its operating mechanism.

In FIG. 5 as a cross-sectional view of the device of the present invention, FIGS. 6 and 7 as side sectional views of two locations, and FIG. 8 as a side view, 2.
1 and 22 are solenoids for operating the electromagnetic safety valve 1 and the main valve 4; 23 and 24 are push rods for transmitting the movement of the respective operating cams 7 and 8 to the safety valve 1 and the main valve 4; 25, 26, 32, and 33 is double press rod 2
a group of springs 27, for keeping the cams 7, 8 and the valves 1, 4 in a linked operating state;
28 is a pressure rod for operating the pilot valve 5 and a spring for closing the valve; 29, 30 and 31 are gas supply pipes to the device, and joints for connection with the sub-burner 18 and the main burner 19; 20 is a joint for connecting the device to the This is the casing.

The overall configuration of this embodiment is shown in the operating electrical circuit diagram in Fig. 1, Fig. 2 as a conceptual diagram of the arrangement of the main components, Fig. 3 as an operation time chart of these main components, and the cam. The configuration and operating mechanism thereof will be explained below with reference to FIGS. 5 to 8.

Electromagnetic safety valve 1 installed at the gas introduction part to the device
is a thermocouple 2 heated by the sub-burner 18
The valve is of a type that is forcibly opened by the electromotive force of cam 7,
8 and 9 open and close the electromagnetic safety valve 1, the main valve 4 for the main burner, and the pilot valve 5 for the sub-burner, respectively, and the rotation of the ignition operating shaft 6 activates the igniter 13 of the sub-burner 18. In the combustion control device, in the process of rotating the ignition operating shaft 6 from the stop position to the open position, the electromagnetic safety valve 1, which is once opened by the mechanical action of the cam 7, is turned on by the power supply 11. The shapes of the cams 7 and 9 are set so that after the valve is held open by electromagnetic force, the valve is closed again by the mechanical action of the cam 7, and then the pilot valve 5 is opened. .

In Figure 3, which is an operating time chart of the main components of the device, the horizontal axis represents the rotation angle of the ignition operating shaft 6, and the operating knob is rotated from the stop position of 0° to the open position, rotated 180°. In the process of gradually rotating, the electromagnetic safety valve 1 is first mechanically opened by the action of the cam 7, and then the safety valve 1 is connected to a separate power source other than the thermocouple 2, in this case the DC power source 11.
Power switch to keep the valve open forcibly
SW1 is turned on by the action of a cam 10 attached to the ignition operating shaft 6. When the ignition operating shaft 6 reaches a position rotated by approximately 90 degrees, (this is the gist of the present invention)
Due to the specific shape of the cam 7, the mechanical valve-opening force once applied to the electromagnetic safety valve 1 is lost. As this mechanical valve opening force is lost, at a position rotated by about 90 degrees or more, both the electromotive force of the thermocouple 2 or more than a predetermined value or the electric power from the DC power supply 11 via the power switch SW1 is reduced to a predetermined value. When the temperature is below, the electromagnetic safety valve 1 closes. After the mechanical valve-opening force is lost, the pilot valve 5 is opened by the action of the cam 8, and at the same time, the power switch SW2 is turned on to operate the igniter 13 of the sub-burner.
The opening/closing cam 10 acts on the ignition starting side. Then, as a final step, the main valve 4 is opened as the cam 8 rotates, the main burner 19 is ignited by the sub-burner 18, and the gas combustion appliance enters the operating state.

When the pilot valve of the ignition operating shaft is in the rotational position where it is opened, if for some reason the pilot valve extinguishes and the electromotive force of the thermocouple becomes less than the specified level, or if the ignition power supply voltage is low and the ignition does not occur. In this case, both the valve opening force due to the electromagnetic force and the mechanical valve opening force due to the action of the cam are lost, the electromagnetic safety valve closes, and raw gas is not released from the pilot valve.

Additionally, when the pilot valve is opened and the sub-burner igniter is started at the same time, the safety valve that was once opened is closed again in the process of rotating the ignition operating shaft from the stop position to the open position. If a valve opening/closing mechanism with a cam shape is adopted so that the pilot valve for the secondary burner is opened after the burner has been used, (if the igniter for the secondary burner is started before the pilot valve is opened), it will be possible to extinguish the fire. When returning the ignition operating shaft to the stop position, if for some reason the ignition operating shaft returns to the point before the pilot valve starts opening, but does not return to the ignition starting position, and the rotation of the ignition operating shaft is stopped midway. (In case of malfunction of ignition control shaft),
The pilot valve and main valve are closed to extinguish the fire, but
The igniter operating switch cannot be activated by the cam mechanism. Under this condition,
For example, if you move the ignition operating shaft halfway in the direction of ignition, the igniter will not work, but the safety valve will remain open for a certain period of time until it cools down due to the electromotive force from the thermocouple due to residual heat, and the pilot valve and main valve will open. is opened by the action of a cam, causing raw gas to be released for a certain period of time, but if the sub-burner igniter is started at the same time as the pilot valve is opened, the ignition operation shaft When the igniter is moved back in the ignition direction, the igniter is activated and the pilot valve is ignited, thereby preventing the release of raw gas caused by malfunction of the ignition operating shaft.

[Brief explanation of the drawing]

Fig. 1 is an electrical circuit diagram for operating the device of the present invention;
The figure is a conceptual diagram of the arrangement of the main components of the device, Figure 3 is an operation time chart of each major component, Figure 4 is a front view of the ignition control shaft knob showing the rotation range, and Figure 5 is the device. Cross section of Figures 6 and 7
The figures are side cross sections of the two locations, and FIG. 8 is a diagram depicting each side. In the figure, 1...electromagnetic safety valve, 2...thermocouple, 4...
...Main valve, 5...Pilot valve, 6...Ignition operation shaft, 7-10...Cam, 11...DC power supply, 1
3...Igniter, 18...Sub burner, 19...Main burner.

Claims (1)

[Scope of Claims] 1. A normally closed electromagnetic safety valve is provided in an upstream gas introduction path where a main burner side gas introduction path equipped with a main valve and a sub-burner side gas introduction path equipped with a pilot valve diverge. , a thermocouple facing the auxiliary burner and an igniter for the auxiliary burner are provided, and an ignition operating shaft for operating the igniter is provided with a cam that opens and closes the safety valve, the pilot valve, and the main valve, respectively, the electromagnetic safety valve; is opened by the action of at least one of electromagnetic force or a cam, and when the electromotive force of the thermocouple facing the sub-burner rises to a predetermined value, the forced opening force of the electromagnetic force acts on the safety valve, and ignition starts. Sometimes, in a gas control device in which forced opening force of electromagnetic force from an ignition power source is applied until the electromotive force of the thermocouple rises to a predetermined value, in the process of rotating the ignition operating shaft from the stop position to the open position, The safety valve once opened by the cam,
The valve is held open by the electromagnetic force from the power supply, and the cam closes the safety valve again.
The shapes of the cams are set so that the pilot valve opens, and the auxiliary burner igniter is started after the pilot valve is opened and the main valve is opened subsequent to the opening of the pilot valve. A gas control device characterized by having been set in an earlier period.