JPS611917A - Combustion controller - Google Patents

Abstract

PURPOSE:To prevent a relatively large ignition sound based on the operation of an ignitor by making the ignitor inoperative when a power source voltage is lowered to less than a predetermined voltage and releasing a forcible holding of the valve opening of an electromagnetic safety valve. CONSTITUTION:When a push button 8 is pushed up to an ignition position B, an electromagnetic safety valve 1, an interrupting valve 4 and an ignition valve 6 are opened. Simultaneously, a relay 22 is actuated by the voltage of a capacitor 23, an ignitor 16 operates for a predetermined period of time, and a pilot burner of a burner unit 2 is ignited. A discharge circuit 21 is closed by the operation of the relay 22, and opening of the electromagnetic safety valve 1 is forcibly held by the discharge current of a capacitor 19. In a case where a battery is used as a power source 18 and the voltage is lowered less than a predetermined value, the relay 22 does not operate. Accordingly, then a predetermined value, the relay 22 does not operate. Accordingly, opening of the electromagnetic valve 1 is not forcibly held, and a raw gas is not emitted from the burner unit 2. In such a case, if the voltage of the power source 18 is made more than a predetermined value, an ignition sound which is relatively large due to the ignitor can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an electromagnetic safety valve that is inserted into the gas passage leading to the burner latch 1 and presses the operation part 1 of the electromagnetic safety valve (1-1) to open the valve with a discharge current of 2-1. The present invention relates to a forced hold type combustion control device 27.

In this type of combustion control device, the igniter is connected to the power source and activated by τ when the steering part l is operated to the ignition position. Generally speaking, the interval between discharge 0 and r improves as the power supply voltage decreases. Therefore, if there is even a slight delay in the discharge of the igniter, the gas passage is opened at the same time as the operating member is moved to the ignition position, resulting in a relatively loud ignition noise due to the ignition delay.

The present invention aims to prevent such inconveniences from occurring, and the present invention aims to prevent such inconveniences from occurring.
An igniter that is connected to a power source and activated by operating an operating member that presses and releases an electromagnetic safety valve that is interposed in a play passage connected to a backlash passage to the ignition position, and a capacitor that is charged when the operating member is not operated. When the operating member is operated to the ignition position, the electromagnetic safety valve is opened to face the gas unit, and the capacitor is operated until the thermoelectromotive force of the thermocouple rises to a predetermined value. Forced hold J with discharge current of
When the operating portion H is operated to the ignition position, the igniter is maintained in an activated state for a predetermined period of time after the operation, and the igniter is deactivated when the power supply voltage drops to a predetermined value of 1+ff or less. The invention is also characterized in that a control means is provided for releasing the forced hold.

FIG. 1 shows a cutaway plan view of a water heater equipped with a combustion control device of the present invention.

In Fig. 1 a), (1a) is the solenoid of the electromagnetic safety valve (1), and the electromagnetic safety valve (1) is connected to the burner units 1 to (2).
), the electromagnetic safety valve (1) is attached to the first operating member (7), and is inserted into the gas passage (3) connected to When the push button (8) is pushed to the ignition position B, the tip of the valve rod (9) is pressed to open the shutoff valve (4) and the ignition valve (6).
), the shutoff valve (4) is provided in response to the pushing of the push button (8) to the intermediate position C and the ignition position B, and the ignition valve (6) is provided to the ignition position opening in (8) of the push button (8). Each valve was opened by pushing.

Moreover, the water pressure responsive valve (5) was operated by a water pressure detector (11) that detects water flow to the heat exchanger (1o). (1 is a water valve operated by the second operating part tJ (+3) which is connected to the push button (8) common to the first operating part (7), and the water valve (121 is the push button (8) ) to the ignition position port to stop water flow or reduce the amount of water flow, and by operating to intermediate position C to allow water to flow.

(+4) is a changeover switch that is switched by pushing the push button (8) to intermediate position C, (15) is a changeover switch that is switched by pushing pushbutton (8) to ignition position B, and this changeover switch 05) is arranged, for example, at the same position as the changeover switch (14). (+6) (17) are the igniter and thermocouple facing the burner unit (2), respectively.

FIG. 2 shows an example of an electric circuit constructed using these changeover switches Q4) (15) and the like.

In Figure 2, the solenoid (1a) of the electromagnetic safety valve (1)
) is intervened in the charging circuit l2I) of the capacitor (19) connected to the battery power supply (1 day) via the b contact of the changeover switch (+4), and also the changeover switch (1
It is arranged to intervene in the discharge circuit of the capacitor 09) connected through the a contact of 4).

According to the present invention, the electric circuit includes the operating member (
According to the operation to the ignition position of 7), the igniter (16) is activated for a predetermined period of time after the operation, and when the voltage of the power source (18) drops below a predetermined value, the igniter (16) is deactivated. The present invention is characterized by a control means for canceling the forced opening of the electromagnetic safety valve (1).

This control means will be described in detail below, using a relay (c) having contacts (22a) and (22b) interposed in the circuit connecting the igniter (16) to the power source (18) and the discharge circuit (01), respectively. In preparation, the relay @ is intervened in the discharge circuit of the second capacitor (), and the second capacitor () is connected to the push button (
The changeover switch (8), which is closed when not operated, is connected to power supply 1 (18) through the b contact of 4 - θ5) and is charged, and is opened when push button (8) is operated to ignition position B. discharge through the a contact of the changeover switch (15),
The relay @ is activated for a predetermined period of time by the discharge current when the voltage of the power supply (III) exceeds a predetermined value, thus connecting the igniter (16) to the power source (16) via the contact (22a). When activated, the discharge circuit 021) is opened to forcibly hold the electromagnetic safety valve (1) open for a predetermined time, and the relay (to) is activated when the voltage of the power source 08) drops below a predetermined value. Thus, the igniter (16) is deactivated and the discharge circuit 01) is connected to the contact (
22b) to release the forced open hold of the electromagnetic safety valve (1).

In FIG. 2, OI) is a resistor for adjusting the discharge time constant of the capacitor () and setting the operating voltage and operating time of the relay @. The operating time and operating voltage of the relay can also be changed depending on the rating of the relay, the partial voltage of the charging voltage of the capacitor, etc.

Next, its operation will be explained.

When the push button (8) is pushed to the ignition position B, the valve rod (9) pressed by the first operating member (7) closes the electromagnetic safety valve (1),'
Open the aIi valve (4) and the ignition valve (6). At the same time, the changeover switch (+4) (+5
) is switched from the 1-position to the a contact as shown in FIG. When the voltage of the power supply 08) exceeds a predetermined value, the voltage of the battery ψ) charged by the voltage causes the relay @
is activated, the igniter θ6) is activated for a certain period of time, and thus the pilot burners of the burner blades 1 to (2) are ignited. The discharge circuit I21) is opened by the operation of the relay wire, so press the push button (8) as the igniter! Even if it returns from ifB to the intermediate position @C, the opening of the electromagnetic safety valve (1) is forcibly held by the discharge current of the thermocouple (17).
) is maintained by the thermoelectromotive force generated by heating by the pylon l-burner. When the water valve θ2 is opened by returning the push button (8) to the intermediate position C, water flows through the heat exchanger 00), and the water pressure responsive valve (5) is opened, so that the main barb of the barb unit (2) is opened. ignites.

For example, when a battery is used as the power source 08), its voltage decreases as it is used. When this voltage drops below a predetermined value, when the push button (8) is operated as described above,
Since the relay @ does not operate, the igniter section does not operate and the burner unit (2) does not ignite. and condensation υ(
Since the discharge circuit 21) (19) remains open, the electromagnetic safety valve (1) is not forcibly held open and the button (8) is pressed.
Upon returning to the intermediate position C, the electromagnetic safety valve (1) is closed. Kari-C raw gas is not released from the burner unit (2).

Therefore, in such a case, if you check the voltage of the power supply (1B) and if the voltage has dropped, increase the voltage to a specified value or higher, it will prevent a relatively large problem caused by the conventional igniter. Ignition can be prevented before it happens.

In the circuit shown in Figure 2, the relay has two interlocking contacts (22a) and (22b);
Figure and Figure 4 [As shown, instead of the relay @, two relays (22aH22b) each have one contact (22aH22b)
A) Using (22B), insert the relay (22^) into the discharge circuit of the =1 capacitor ■) and its contact (22a)
is connected in series with the igniter (16), and the relay (22B) is connected in series or parallel with the igniter (16), and its contact (22b) is inserted into the discharge circuit 01) of the capacitor (+9). can also have a similar effect.

FIG. 5 also shows an electrical circuit of another embodiment of the invention.

The circuit shown in the same figure is different from the circuit shown in Fig. 2 in that a sub-discharge circuit ch) is provided, and the sub-discharge circuit ch) has a normally closed contact (22b) of the relay @ and a resistor. ) intervenes, and when the relay (c) is inoperable, the circuit (i) is connected to the discharge circuit (121) of (+9) to immediately discharge the electric charge of (19), and the electromagnetic safety valve is activated. (1)
In addition to releasing the forced hold on the valve opening of the valve, it is also ensured that no charge remains in the battery (19) under any operating conditions, and when extinguishing a fire, the charging current of the capacitor (19) always exceeds the thermoelectromotive current of the thermocouple (7). Cancellation, electromagnetic safety valve (1)
It acts so that ■1 valve is turned on.

Thus, when the voltage of the power supply (1B) exceeds a predetermined value, the relay @ is activated and its contact +22A) is closed, so the igniter (+6) is activated for a predetermined time, while the contact (22b)
Since is opened, the sub-discharge circuit (i) is opened. Therefore, push the push button (8) to the ignition position to fire the burner unit I.
~ (2) is returned to the intermediate position G after ignition, the N magnetic safety valve (1
) is forcibly kept open by the discharge current flowing through the discharge circuit 2+) of the capacitor -09), and then kept open by the thermogenic flow of the thermocouple (c).

Then, when the water valve (water pressure response valve (5)) opens in conjunction with the opening of the water valve, the burners 1 to (2) are ignited.Igniter 06)
After the auxiliary discharge circuit has been activated for a specified period of time, the secondary discharge circuit is opened.
The electric charge in the thermoelectric valve (09) will be quickly discharged, and if the burner unit (2) fails to ignite, the forced hold will be released and the electromagnetic safety valve (1) will quickly close, and if it ignites, the thermoelectric Due to the thermal electromotive current of pair (7), the electromagnetic safety valve (1) continues to open and combustion continues.

When the fire is extinguished, the selector switch (14) is closed to the b contact side, and the battery '4j (19) is charged from the frost @ (1B) t. As a result, the charging power flowing to the solenoid (1a) is transferred to the solenoid (1a). 1a) also extinguishes the thermal electromotive current flowing through the thermal lightning pair (c), and quickly opens the electromagnetic safety valve (1).

When the voltage of the power source 08) drops below a predetermined value, the relay (c) is inactive, so the igniter (16) does not operate.
A sub-discharge circuit (i) is formed, and the charge in the capacitor θ9) is quickly discharged, and the forced hold of opening of the electromagnetic safety valve (1) is released and the valve is closed.

The circuits shown in FIGS. 6 to 10 each have a sub-discharge circuit section like the circuit shown in FIG. 5. The circuits shown in FIGS. 6 and 7 correspond to the circuits shown in FIGS. 3 and 4, respectively, except for the sub-discharge circuit.

In the circuits shown in FIGS. 4 and 7, the capacitor ) is connected in series with the relay (22A) when the push button (8) is not operated, and connects the open b contact of the changeover switch (15). The battery is charged from the power source (lB) through the switch (15) and discharged through the a contact of the switch (15) which is closed when the push button (9) is operated to the ignition position. Although different from those shown in FIGS. 3 and 6, the operation is the same.

The circuit shown in Figure 8 uses a relay with one switching contact, whose A contact is connected in series with the igniter (+6), and whose B contact is connected to the sub-discharge circuit (E). It is something.

The circuit shown in FIGS. 9 and 10 uses a switch (of a switch) that is linked to a water pressure responsive valve (5) that opens in response to the opening of the water valve in the S boiler, and connects this to the sub-discharge circuit. ), and when the water valve is opened, the switch c! ? ) is closed, and the forced hold of opening of the electromagnetic safety valve (1) is released by the auxiliary discharge circuit (i).

As described above, according to the present invention, when an operating member such as an electromagnetic safety valve is operated to the ignition position, the igniter is maintained in an activated state for a predetermined period of time after the operation, and the igniter is turned off when the power supply voltage drops below a predetermined voltage. Since we have provided a control means to disable the electromagnetic safety valve and release the forced hold on the opening of the electromagnetic safety valve, it is possible to prevent the relatively loud ignition noise caused by the activation of the igniter when the power supply voltage drops; It has the effect of being carried out safely without the generation of gas.

[Brief explanation of the drawing]

FIG. 1 is a cutaway plan view of an example of a water heater to which the present invention is applied, and FIGS. 2 to 10 each show an electric circuit of an embodiment of the present invention.

Claims (1)

[Scope of Claims] 1. An igniter that is connected to a power source and activated by operating an operating member to an ignition position that presses and opens an electromagnetic safety valve interposed in a gas passage connected to a burner unit facing the igniter; and a capacitor that is charged when the operating member is not operated, and when the electromagnetic safety valve is opened when the operating member is operated to the ignition position, the thermoelectromotive force of the thermocouple facing the gas unit reaches a predetermined value. In the device in which the igniter is forcibly held by the discharge current of the capacitor until the voltage rises, when the operating member is operated to the ignition position, the igniter is held in the operating state for a predetermined period of time after the operation, and the power supply voltage is A combustion control device characterized in that a control means is provided for deactivating the igniter and releasing the forced hold when the value falls below a predetermined value. 2. Combustion according to claim 1, characterized in that a solenoid of the electromagnetic safety valve is interposed in the charging circuit of the capacitor, and the charging current flowing through the solenoid has a polarity opposite to that of the thermocouple. Control device.