JPH0216126Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to various gas combustion devices such as gas water heaters, gas bath equipment, gas fan heaters, and gas stoves. The present invention relates to a gas combustion device in which a plurality of electromagnetic valves for cutting off fuel supply are installed in series in a road, and the fuel supply passage is cut off in multiple layers by the electromagnetic valves to improve safety.

[Prior Art] Electromagnetic valves used to cut off fuel supply in gas combustion equipment are broadly classified into valves that are electromagnetically maintained in an open state against self-closing force and then cut off the current to stop the self-closing force. A self-holding type solenoid valve that non-electromagnetically maintains both the open and closed states and is electromagnetically closed when energized. However, conventionally, in gas combustion equipment in which a plurality of solenoid valves for cutting off fuel supply are installed in series in the fuel supply path, all of these solenoid valves are of the energization holding type, or all of them are self-contained. It was either a holding type or a holding type, and the configuration was such that the types of solenoid valves installed in series were simply unified (I cannot provide any literature).

(Problem that the invention aims to solve) However, in a type in which all the solenoid valves for fuel supply cutoff are unified to the energization holding type, during the combustion operation of the burner,
Since it is necessary to continuously supply electric power to all of these solenoid valves to maintain the valve open state, power consumption is large, which increases the electricity bill.
Additionally, devices that use batteries as a power source have problems such as frequent battery replacement.Furthermore, new power generation means such as thermoelectric power generation elements and photovoltaic elements, which have limited power generation, cannot be used as power sources. There were also problems in technological development that made it difficult to introduce and use.

On the other hand, a model in which all of the solenoid valves for cutting off fuel supply are self-holding types does not require electricity to maintain the valve open or closed state, so the power consumption is quite low, but the power consumption is quite low. Because everything is done electromagnetically by energizing, in the event of a power supply problem such as a failure in the power supply circuit or a voltage drop in the power supply battery, all of the solenoid valves installed in series will be unable to close and the fuel supply will be cut off. There was a risk that the system would become inoperable, and there was still a problem of lack of trust in terms of safety.

The purpose of the present invention is to reduce power consumption and ensure safety against power supply troubles by rationally improving the functional characteristics of each type of solenoid valve.

[Means for solving problems]

The characteristic configuration of the gas combustion device according to the present invention is such that some of the plurality of electromagnetic valves for cutting off fuel supply installed in series in the fuel supply path are kept in the open state by resisting self-closing force. The remaining number of valves are self-maintaining solenoid valves that non-electromagnetically maintain their open and closed states. is as follows.

[Effect]

In other words, only some of the solenoid valves installed in series are energized type solenoid valves that require electric power to maintain the open state, and the others require electric power to maintain the open and closed states. Since it is a self-holding type that does not require any electricity, the total amount of power required to maintain the solenoid valve open state during burner combustion operation can be reduced compared to a type in which all solenoid valves are energized and held. Device power consumption is reduced.

In addition, regarding safety against power supply troubles, which has been a problem in models where all solenoid valves are self-holding, even if a power supply trouble occurs and the electromagnetic closing operation of the self-holding solenoid valve becomes impossible. Due to a power supply problem, the energized solenoid valve installed in series with the self-holding solenoid valve was unable to maintain its open state electromagnetically, and the energized solenoid valve automatically closed due to the self-closing force. The valve closes automatically, thereby cutting off the fuel supply.

[Effect of idea]

As a result of the above, it is possible to both reduce power consumption and ensure safety against power supply problems, reducing electricity costs and
While achieving longer lifespans of power batteries and easier technological development using thermoelectric power generation elements and photovoltaic elements, in terms of safety, the original safety structure of cutting off the fuel supply route in multiple layers has been improved. The combination of this and ensuring safety against power supply troubles has made it possible to achieve high reliability.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 shows the configuration of a combustion section applied to various gas combustion devices, and shows a fuel supply path 2 for a gas burner 1.
A first solenoid valve 3 and a second solenoid valve 4 for cutting off fuel supply, and a gas governor 5 are interposed in series,
A fuel supply path 2 with those two solenoid valves 3 and 4
By doubly shutting off the gas, safety against gas leaks, etc. is improved.

6 in the figure is an ignition circuit that generates a spark in the spark rod 7 to ignite the burner 1;
is a power supply circuit that supplies operating power to the two electromagnetic valves 3 and 4, operating power to the ignition circuit 6, and the like.

9 opens both electromagnetic valves 3 and 4 based on the ON operation of the operation switch 10, and also opens the ignition circuit 6.
This is a combustion control circuit that closes both electromagnetic valves 3 and 4 based on the OFF operation of the operation switch 10, and is automatically controlled by the combustion control circuit 9 based on the ON/OFF operation of the operation switch 10. The burner 1 is ignited and extinguished in the following manner.

11 is a combustion state detection circuit using a flame rod or a thermocouple as the combustion flame detection end 12;
The first and second solenoid valves 3 and 4 are configured to be automatically closed by the combustion control circuit 9 based on the detection result of the combustion state detection circuit 11 when a combustion trouble such as a burnout or incomplete combustion occurs. It has been done.

Of the two electromagnetic valves 3 and 4, the first electromagnetic valve 3 is electromagnetically opened by energizing the valve against the self-closing force and maintaining the valve open state by cutting off the energization. A so-called energized holding type solenoid valve that closes with a self-closing force is applied, while the second solenoid valve 4 is mechanically held to maintain the valve open state and maintain the valve closed state. A so-called self-holding solenoid valve is used, which is non-electromagnetically operated by a mechanism, and which operates electromagnetically by energizing the valve.

In other words, by making one of the two solenoid valves 3 and 4 installed in series a energization holding type and the other being a self-holding type, during the combustion operation of the burner 1, the first energization holding type Although the fuel supply can be continued by simply supplying power to the solenoid valve 3 to maintain the valve open state, and the power consumption of the combustion apparatus as a whole can be reduced, in the unlikely event that the power supply circuit 8
When the self-holding type second solenoid valve 4 is unable to close due to a failure, etc., the first solenoid valve 3 self-closing, which cuts off the supply of power to maintain the valve open state due to the power supply trouble. The fuel supply can be cut off by automatically closing the valve using a biasing force, thereby reducing power consumption and ensuring safety against power supply troubles.

In configuring the combustion control circuit 9, when the operation switch 10 is turned OFF to extinguish the burner, as shown in FIG. After the solenoid valve 4 is closed, the combustion state detection circuit 11 confirms that the burner is extinguished.
The solenoid valve 3 is operated to close, and
In the burner extinguishing operation, if burner extinguishing is not confirmed by the combustion state detection circuit 11 within, for example, about 2 to 3 seconds (Δt) after the closing operation of the second solenoid valve 4, the burner extinguishing operation is performed as shown in FIG. As shown, when the set time (Δt) has elapsed, the first solenoid valve 3 is closed, and the abnormality notification circuit 13 is activated assuming that the second solenoid valve 4 has failed. There is.

In other words, when a failure such as coil breakage occurs in the self-holding second solenoid valve 4 and it becomes impossible to close the valve, the user does not notice the failure and the burner is closed only by opening and closing the first solenoid valve 3. Continuous use of the device for ignition and extinguishing operations is prevented by activating the abnormality alarm circuit 13 as described above, thereby double-blocking the fuel supply path 2 by the two solenoid valves 3 and 4. The original safety function is maintained.

[Another example] Next, another embodiment of the present invention will be described.

Some of the three or more solenoid valves may be of the energization holding type, and the remaining number may be of the self-holding type, and these three or more solenoid valves may be interposed in series in the fuel supply path 2. The number of energization holding type solenoid valves and self-holding type solenoid valves may be any number as long as they are each one or more.

As shown in FIG. 3, a fuel supply path 2 is branched and connected to a plurality of burners 1, and an energization holding type solenoid valve 3 is connected.
and a self-holding solenoid valve 4, one of which is installed as a main valve in the fuel supply path base pipe portion 2a before branching, and the other is installed as a separate valve for each burner 1 in the fuel supply path branch pipe portion after branching. Alternatively, as shown in FIG. 4, a plurality of parallel bypass pipe sections 2c may be provided in the middle of the fuel supply path 2 for one burner 1, and an energization holding type electromagnetic One of the valve 3 and the self-holding solenoid valve 4 is interposed as a main valve in the fuel supply path 2 before the bypass pipe section 2c,
The other valve may serve as a capacity switching valve for the burner 1 and may be interposed in each of the bypass pipe sections 2c.

Each of the energization holding type solenoid valve and the self-holding type solenoid valve may be of a type in which the valve opening operation is performed non-electromagnetically by human force etc. instead of the type in which the valve opening operation is performed electromagnetically as in the above-mentioned embodiment, Furthermore, in the self-holding electromagnetic valve, various conventionally known types can be applied to the mechanism for non-electromagnetically maintaining the open and closed states of the self-holding electromagnetic valve.

When adding a function to notify a failure of a self-holding solenoid valve, as in the above embodiment, it is necessary to confirm that the burner is extinguished when the self-holding solenoid valve is closed with priority over the energized holding solenoid valve. Instead of determining whether or not a failure has occurred based on the self-holding type solenoid valve, the operation of the plunger in a self-holding solenoid valve may be directly detected and the presence or absence of a failure may be determined based on the detection result. By utilizing the fact that the operating current change characteristics of a type solenoid valve are different between when the valve is operating normally and when the valve is malfunctioning, the presence or absence of a failure may be determined based on the detection of the changing state of the operating current.

As the power source for operating the electromagnetic valve, various sources can be used, such as a general external power source such as 100 V AC, a battery, a photovoltaic element, a thermoelectric element, etc.

The present invention is intended for various gas combustion devices such as gas water heaters, gas bath devices, gas fan heaters, and stoves.

Incidentally, although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, FIG. 1 is a diagram showing the configuration of a combustion section, and FIG. 2 A and B are time charts, respectively. FIG. 3 and FIG. 4 are respectively diagrams showing the configuration of the pipelines showing another embodiment of the present invention. 1... Burner, 2... Fuel supply path, 3, 4...
solenoid valve.

Claims (1)

[Scope of utility model registration request] A gas combustion device in which a plurality of electromagnetic valves 3 and 4 for cutting off fuel supply are installed in series in a fuel supply path 2 to a gas burner 1, in which some of the electromagnetic valves 3 and 4 are The remaining number of valves are self-holding type solenoid valves that non-electromagnetically maintain their open and closed states. A gas combustion device that serves as a valve.