JPH0217779B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an operation control device for an electromagnetic safety valve applied to gas instantaneous water heaters and other gas appliances.

(Prior Art) The applicant of the present invention has previously developed a device of this type, for example, as seen in Japanese Patent Application No. 118272/1983, in which an operating solenoid for an electromagnetic safety valve interposed in a gas passage leading to a burner unit is used as a condenser. A hold switch is provided in the charging circuit for the capacitor, which is connected to a power source, and is closed when a push button or other operating member is operated toward the ignition position. A type of safety valve has been proposed in which the charging current of the charging circuit is guided through the solenoid and the safety valve is held in the open position. However, in such a valve, the hold time is relatively long. Due to the setting, if an ignition error occurs in the burner unit, a relatively large amount of raw gas is likely to be released through this, which is a disadvantage.

(Problems to be Solved by the Invention) It is an object of the present invention to provide a device that does not have such inconveniences, that is, a device in which the safety valve closes quickly in the event of ignition error to prevent the release of raw gas. .

(Means for Solving the Problems) The present invention has been made based on such a viewpoint, and the operating solenoid of the electromagnetic safety valve interposed in the gas passage leading to the burner unit is connected to the condenser and the solenoid connected thereto. The circuit is provided with a hold switch that closes when a push button or other operating member is operated toward the ignition position, and when the switch closes, the safety valve is closed. In the type in which the charging current of the charging circuit is guided through the activation solenoid and the valve is held in the open position, an auxiliary charging circuit consisting of a side path parallel to the activation coil is connected to the charging circuit for activation and deactivation. It is provided so that it can be freely switched between operation and operation.

(Example) An example of implementing the present invention will be explained with reference to the attached drawings.

The drawing shows a case in which the water heater is applied to a gas instantaneous water heater. Reference numeral 1 indicates the water heater body, and the body 1 is equipped with a heat exchanger 2 and a burner unit 3 facing the same, and its front surface is It is equipped with an operating member 4 consisting of a push button. When the operating member 4 is pressed for the first time, it is moved backward from the closed position A shown in the figure to the ignition position B located behind it, and then returned to the open position C in front of it when the push is released. According to the push button, the push button is configured so that after it moves slightly backward from the open position C, it returns to the initial closed position A when the push button is subsequently released.

The burner unit 3 consists of a main burner 3a, a constant-fire burner 3b on the side thereof, and an ignition burner 3c on the side thereof. When the valve moves backward to the ignition position B, the gas valve 7 is pushed open via the operating rod 6, and when the gas valve 7 is opened, the gas valve 7 is pushed open via the intermediate lever 8. An electromagnetic safety valve 9 is interposed, and the safety valve 9 has an operating solenoid 10 that holds it in the open position.
Further, the gas passage 5 is provided with a water passage 1 located downstream thereof and connected to the heat exchanger 2.
A water pressure responsive valve 13 that opens when water is flowing in response to the water governor 12 in the tank 1 is interposed. The burner unit 3 is equipped with a thermocouple 14 connected in parallel with the operating solenoid 10 on its upper surface, and is also equipped with an igniter 15 for ignition, and the igniter 15 is located at the ignition position B of the operating member 4 described above. According to the operation,
It responds to an ignition switch 16 that is pushed through the operating rod 6 to close it, and is further provided with a hold switch 17 on the side of the ignition switch 16 that is also pushed through the rod 6 and closes. . In the drawing, reference numeral 18 indicates a water valve inserted into the water passage 11, and when the operating member 4 returns from the ignition position B to the opening position C, the valve 18
It shall be configured to open when pushed by it.

FIG. 2 shows the electric circuit, in which the operating solenoid 10 is connected to a capacitor 19, and a charging circuit 2 for the capacitor 19, which is composed of a power supply 20 connected thereto.
1, and the above-mentioned hold switch 17 is also intervened in the circuit 21, and when the switch 17 is closed as the above-mentioned operating member 4 moves backward to the ignition position B, the charging circuit 21 is activated. A charging current flows through the actuating solenoid 10 to cause the solenoid 10 to perform a predetermined operation, that is, to hold the safety valve 9 in the open position. In the drawing, reference numeral 22 designates a discharging circuit which is closed upon opening of the switch 17 and is to then discharge the charge of the capacitor 19.

Although the above is not particularly different from what was proposed earlier, according to the present invention, the charging circuit 21 is provided with an auxiliary charging circuit 23 consisting of a side path in parallel with the actuating solenoid 10; The circuit 2 is provided with a switch 24 which is normally open and connected to the circuit 2.
3 is in an inoperative state, and when the operating member 4 is returned from the ignition position B to the open position C, the switch 24 is closed and the circuit 23 is ready for operation. In the illustrated example, the switch 24 is connected to the water governor 12 described above.
The system is designed to close when water is flowing in conjunction with the system.
Note that even in the embodiment shown in FIG. 1, the switch 24 provided in the circuit 23 takes about 1 second to return to the intermediate position after pressing the operating member 4 and releasing the operation. The thermocouple 14 can obtain the electromotive force necessary to attract the solenoid valve 9 during this period. However, if the electromotive force obtained during this time is insufficient, the resistor 25 is inserted to delay the operation as necessary. FIG. 3 shows a modification thereof, which is not particularly different from the above-described one except that the switch 24 is constructed in a switching type.

(Function) The operation will be explained below. When the first push and the second push release are applied to the operating member 4, the gas passage 5 opens and the igniter 15 is activated to activate the burner unit 3. At the same time, water is passed through the heat exchanger 2 to obtain hot water, and this point is not particularly different from the conventional one.
Furthermore, during such operation, the hold switch 17 closes to generate a charging current in the charging circuit 21, and the operating solenoid 10 is energized by the current for a predetermined period of time to hold the electromagnetic safety valve 9 in the open position. Although not particularly different from the previously proposed one, according to the present invention, the auxiliary charging circuit 23 is provided as described above, and the following operation can be obtained. That is, considering the case where an ignition error occurs in the burner unit 3, when the operating member 4 returns to the open position C,
The switch 24 is closed and the auxiliary charging circuit 23 is activated, so that the charging current of the charging circuit 21 is bypassed through the auxiliary charging circuit 23 and the activation solenoid 10 is de-energized, so that the electromagnetic safety valve 9 is activated. The hold by the solenoid 10 is released and the solenoid closes quickly to prevent raw gas from being released inadvertently.

In addition, in the above-mentioned embodiment, one common operation member 4
Although the operating rod 6 and the water valve 18 are configured to be operated by the above, it goes without saying that they may be configured to be operated by separate operating members. In this case, if the switch 24 intervening in the auxiliary charging circuit 23 is closed in conjunction with the water governor 12 as in the above-described embodiment, the auxiliary charging circuit 23 will be in the operating state and the unused battery immediately after the ignition operation will be activated. This prevents the release of raw gas when the water valve is opened and operated during ignition.
Furthermore, in the case where the operating rod 6 and the water valve 18 can be operated by separate operating members, for example, as shown in Japanese Patent Publication No. 47-7296, etc., the operating rod 6 is closed to the position A and the ignition position behind it is set. 2 with B
It may also be possible to switch the position. To explain this with reference to the device shown in FIG.
0 and closes the hold switch 17 to forcibly hold the electromagnetic safety valve 9, and in this state, when the water valve 18 is opened by a separate operating member, the switch 24 is closed. Similarly, it is possible to prevent the release of raw gas when the water valve is opened when the fire is not ignited. If the operating rod 6 and water valve 18 are operated by separate operating members, the subsequent opening operation of the water pressure responsive valve 13, that is, the accompanying closing operation of the switch 24, will be delayed after the ignition operation. During this time, the electromotive force of the thermocouple 14 is more fully obtained, and the need for the resistor 25 is further reduced.

Furthermore, although the instantaneous water heater of the above embodiment has been described, it goes without saying that the present invention can also be applied to gas stoves, etc. In this case, the switch 24 that intervenes in the auxiliary charging circuit 23 is opened from the ignition position of the operating rod 6. It is possible to switch directly to the active state by a switching movement into the position.

(Effects) As described above, according to the present invention, the charging circuit is provided with an auxiliary charging circuit consisting of a bypass circuit in parallel with the operating solenoid, and the charging current can be freely diverted to this circuit.
For example, in the event of an ignition error, the operating solenoid can be de-energized and the electromagnetic safety valve can be quickly closed using the bypass, thus preventing the inadvertent release of raw gas.Furthermore, the structure is simple and inexpensive. It has the following effects.

[Brief explanation of drawings]

FIG. 1 is a cutaway plan view of an example of a gas instantaneous water heater equipped with the device of the present invention, and FIG. 2 is a circuit diagram of the main parts thereof.
FIG. 3 is a circuit diagram of a modification thereof, and FIG. 4 is a plan view of another embodiment of the gas instantaneous water heater. 3...Burner unit, 4...Operation member, 5...
...Gas passage, 9...Solenoid safety valve, 10...Operation solenoid, 17...Hold switch, 19...
Capacitor, 20...power supply, 21...charging circuit,
23...Auxiliary charging circuit.

Claims (1)

[Claims] 1. An operating solenoid for an electromagnetic safety valve interposed in a gas passage leading to a burner unit is a condenser,
In addition to intervening in the charging circuit of the capacitor consisting of a power supply connected to the capacitor, the circuit is provided with a hold switch that closes when a push button or other operating member is operated toward the ignition position, and the circuit is closed when the switch is closed. If the safety valve is of a type in which the charging current of the charging circuit is conducted through the operating solenoid and held in the valve open position, the charging circuit includes an auxiliary charging circuit comprising a side path parallel to the operating coil. An operation control device for an electromagnetic safety valve that can be freely switched between activation and deactivation. 2. The operating member is configured to be switchable from the ignition position to the intermediate open position and to the closed position, and the auxiliary charging circuit is brought into an operating state by switching the operating member from the ignition position to the open position. An operation control device for an electromagnetic safety valve according to claim 1, which is selected from the following. 3. An operation control device for an electromagnetic safety valve according to claim 1, which includes a resistor interposed in the auxiliary charging circuit.