JPH0318089B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides an electromagnetic safety valve that is installed in a gas supply path to a burner and is held open by a predetermined electromotive force from a thermoelectric generator heated by the burner. Regarding gas safety equipment designed to

(Prior Art) As a conventional device of this type, for a certain period of time at the initial stage of ignition of the burner, that is, after ignition of the burner until a predetermined electromotive force is generated from the thermoelectric generating element, the electromotive force from the thermoelectric generating element is It is known that an electromotive force from a separate power source is added to the electromotive force so that the electromotive force exceeds a predetermined value, thereby forcibly holding the electromagnetic safety valve open (see, for example, Japanese Utility Model Publication No. 55-26671). .

(Problems to be Solved by the Invention) Therefore, according to the above-mentioned conventional device, the electric circuit becomes complicated due to the provision of a circuit related to a separate power source, and it also has the disadvantage of consuming additional electrical energy. cormorant.

(Means for Solving the Problems) The present invention attempts to solve the above-mentioned inconvenience by forcibly holding an electromagnetic safety valve open for a certain period of time at the initial stage of ignition without using an electric circuit. , in a gas safety device in which an electromagnetic safety valve installed in a gas supply path to a burner is held open by a predetermined electromotive force from a thermoelectric generating element heated by the burner, after the burner is ignited, the thermoelectric generator A forced hold burner is provided which heats the thermoelectric generating element together with the burner until a predetermined electromotive force is generated from the element, and a gas on-off valve interposed in the forced holding burner is connected to the gas generating element. The valve is characterized in that the valve is closed by a predetermined electromotive force.

(Function) The present invention has the above-described configuration. According to this, since heating is performed only by the burner, during a certain period of time at the initial stage of ignition of the burner, which takes a long time to generate a predetermined electromotive force from the thermoelectric generating element, The thermoelectric generator is heated by both the burner and the forced hold burner so that the thermoelectric generator quickly generates a predetermined electromotive force, thereby providing an electromagnetic safety valve interposed in the gas supply path of the burner. After that, a predetermined electromotive force is generated from the thermoelectric generating element only by heating by the burner. After a certain period of time after the initial ignition of the burner, the electromagnetic safety valve is opened by the predetermined electromotive force. At the same time, the gas on-off valve provided in the forced hold burner can be closed, and heating of the thermoelectric power generation element by the forced hold burner can be stopped.

(Example) Next, an example of the present invention will be described with reference to the accompanying drawings.

In FIG. 1, 1 indicates a main burner used, for example, in a gas water heater, and a gas supply path 2 to the main burner 1 includes an electromagnetic safety valve 3, a gas tank 4, and a governor 5 in order from the upstream side. Also, an igniter 6 is installed facing the combustion surface of the main burner 1.
and a thermocouple 7 which is a thermoelectric generating element.

The gas tank 4 is configured to drive the igniter 6 to ignite the main burner 1 when the gas tank 4 is opened, and the electromagnetic safety valve 3 opens in conjunction with the opening operation of the gas tank 4, and its operating coil 3a The valve is configured to be kept open when energized by a predetermined electromotive force from the thermocouple 7 heated by the main burner 1.

The above configuration is not different from the conventional device described above, and according to this, a certain period of time at the initial stage of ignition of the main burner 1, that is, a period of time until a predetermined electromotive force is generated from the thermocouple 7 heated by the main burner 1. As shown by line A in FIG. 2, it is relatively long, so some means is required to keep the electromagnetic safety valve 3 open during this period.

Therefore, in the conventional device, a power source separate from the thermocouple 7 is provided, and the electromagnetic safety valve 3 is kept open by the electric energy supplied from the power source. A burner 8 is provided, and the degree of heating is increased by heating the thermocouple 7 with both the forced hold burner 8 and the main burner 1 for a certain period of time. A predetermined electromotive force is generated promptly, thereby holding the electromagnetic safety valve 3 in an open state, and after the certain period of time, that is, the thermocouple 7 is heated only by the main burner 1 and the predetermined electromotive force is generated. When this starts to occur, the gas on-off valve 9 installed in the forced hold burner 8 is activated by the predetermined electromotive force so that the gas energy is not wasted and the thermocouple 7 is not overheated.
The valve was closed.

To specifically explain this using a diagram, the forced hold burner 8 is a conventionally known burner 8a.
However, the one shown in Figure 3 has a structure in which the outer periphery of the burner 8a is surrounded by a primary air guide cylinder 8b to be able to suck in a large amount of primary air, which is more convenient than when the burner 8a is used as is. Also made the flame more powerful. The forced hold burner 8 and the main burner 1 are ignited by an ignition burner 10 which is ignited by the igniter 6.

Further, as shown in FIG. 4, in the gas on-off valve 9, the valve rod 9a is pushed by the opening operation of the gas cock 4, and the valve body 9b made of a lid-shaped permanent magnet resists the elastic force of the return spring 9c. This is the electromagnet 11.
A predetermined electromotive force is generated from the thermocouple 7 which is attracted to the non-magnetized iron core portion 11a of the electromagnet 11 and then immediately heated by both the forced hold burner 8 and the main burner 1. When the iron core 11a of the valve body 9b is magnetized with a polarity opposite to that of the permanent magnet constituting the valve body 9b, the repulsive force causes the valve body 9b to
The valve is configured to return to its original position and close the valve.

FIGS. 5 and 6 show another embodiment of the present invention, in which the forced hold burner 8 is constructed of a two-pronged structure whose flames are superimposed on each other, as shown in FIG. to make the flame stronger,
Further, the gas on-off valve 9 is connected to a valve rod 9 as shown in FIG.
A recess 9e is provided in the middle of the valve rod 9d, and an elevating rod 9h is provided on the side of the valve rod 9d, which descends by the return force of the spring 9f and rises by the suction force of the electromagnet 9g. is pressed and the recess 9e and the tip of the lifting rod 9h are engaged, the thermocouple 7 is held in an open state and is immediately heated by both the forced hold burner 8 and the main burner 1. When a predetermined electromotive force is generated and the electromagnet 9g is actuated by this, the engagement between the recess 9e and the tip of the lifting rod 9h is released, and the valve rod 9
d returns to its original position and the valve is closed.

Incidentally, the forced hold burner 8 shown in FIG. 5 can also be used as an ignition burner.

FIG. 7 shows still another embodiment of the present invention. In this case, the forced hold burner 8 is constituted by a conventionally known burner that is ignited by a constant flame burner 12. When a predetermined electromotive force is generated from the thermocouple 7 heated by both this and the normal fire burner 12, the gas on-off valve 9 is closed and the fire is extinguished.

In the case shown in FIG. 7, the constant flame burner 12 is ignited by the igniter 6, and the main burner 1 is ignited by the constant flame burner 12.

(Effects of the Invention) According to the present invention, a forced hold burner is provided which heats the thermoelectric generating element together with the burner until a predetermined electric power is generated from the thermoelectric generating element after ignition of the burner, and the forced holding burner is provided to heat the thermoelectric generating element together with the burner. Since the gas on-off valve installed in the burner is closed by a predetermined electromotive force generated from the thermoelectric generating element, the thermoelectric generating element is closed during a certain period of time at the initial stage of ignition of the burner, as in the conventional device. It is possible to forcibly hold the electromagnetic safety valve open without preparing a separate power source, the electric circuit is simple, and there is no consumption of electrical energy. This has the effect of preventing waste of gas energy and preventing overheating deterioration of the thermoelectric generating element.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing one example of implementation of the device of the present invention, FIG. 2 is a characteristic diagram of a thermoelectric generating element, and FIGS. 3 and 4 are explanatory diagrams showing the main parts of FIG. 1. 5 and 6 are explanatory diagrams showing essential parts of another embodiment of the apparatus of the present invention, and FIG. 7 is a schematic explanatory diagram showing still another embodiment of the apparatus of the present invention. 1... Main burner (burner), 2... Gas supply path, 3... Electromagnetic safety valve, 7... Thermocouple (thermoelectric generating element), 8... Burner for forced hold, 12...
Permanent fire burner (burner).

Claims (1)

[Claims] 1. In a gas safety device in which an electromagnetic safety valve installed in a gas supply path to a burner is held open by a predetermined electromotive force from a thermoelectric generating element heated by the burner, the electromagnetic safety valve is opened after the burner is ignited. A forced hold burner is provided which heats the thermoelectric generating element together with the burner until a predetermined electromotive force is generated from the element, and a gas on-off valve interposed in the forced holding burner is connected to the gas generating element. A gas safety device characterized in that a valve is closed by a predetermined electromotive force.