JPS6126765Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention provides ignition control in a combustion device that is equipped with a plurality of combustors, for example, one for bathing and one for hot water supply, and exhausts their exhaust through a common exhaust stack. Regarding circuits.

Conventionally, in a combustion device of this type that includes a plurality of combustors, when one burner is ignited while the other burner is being ignited, the ignition wind pressure of the ignited combustor is applied to the combustor that is currently burning. It does happen that the combustor during combustion is blown out.

If you close the ignition electric circuit and discharge after recognizing that the ignition has been blown out, there will be a time lag between the blown out and the re-discharge, and the combustion chamber will be filled with unburned gas, increasing the ignition pressure for re-ignition. It has the disadvantage of burning explosively.

To prevent this, it is possible to keep the ignition electric circuit closed during combustion, but doing so not only consumes a large amount of power, but also causes severe wear and tear on the discharge electrodes.

The object of the present invention is to obtain an ignition control circuit in a combustion circuit that is free from such inconveniences, and is intended to provide an ignition control circuit for a plurality of combustors a each having a separate ignition circuit 1.
The exhaust gas from each combustor a is connected to a common exhaust pipe b.
When the ignition electric circuit 1 of another combustor a is closed during combustion in at least one combustor a, the combustion during combustion is The ignition electric circuit 1 of the device is closed.

In the diagram, two combustors a ₁ and a 2 are prepared, and both combustors a ₁ and ₂ are provided with gun-type burners C.
The combustion chambers d ₁ and d ₂ of a ₂ and the exhaust chamber e are connected to a common exhaust pipe b, so that the exhaust gas is exhausted through the common exhaust pipe b.

Each ignition electric circuit 1, 1' is as shown in FIG. The configurations to be configured are indicated with a dashed symbol.

The ignition electric circuit 1 includes a main switch s, a blower/motor M, a first relay R ₁ , a second relay R ₂ , a prepurge timer PT, an ignition timer IT, an ignition transformer IG, a safety timer ST, and a fire detector.
CDS, fuel pump P, and the first relay R ₁ is connected via its self-holding contact R ₁ -a, the a contact ST-a of the safety timer ST parallel to this, and the main switch S, and the second relay R ₂ The pre-purge timer PT and the ignition timer IT are connected to the power supply via the main switch S and the b contact R1 _- b of the first relay _R1 , and are further connected to the ignition transformer IG.
is the main switch S and the b contact R ₁ -b of the first relay R ₁
ignition timer for both ignition electric circuits 1, 1' connected in parallel and connected to the power supply via
Through each contact IT-a, IT-a' of IT, IT' and the b contact CDS-1b of the flame detection circuit CDS, the b of the safety timer ST main switch S and the first relay _R1
Contact _R1 -b and a contact PT- of pre-purge timer PT
A is further connected to the power supply via the b contact CDS-2b of the flame detection circuit CDS.

The flame detection circuit CDS and the electromagnetic pump P are connected via the main switch S, the B contact R1 _- b of the first relay _R1 , and the A contact PT-a of the pre-purge timer PT, and the blower motor M is connected to both ignition electric A contact R 2 -a of each second relay R ₂ , R ₂ ' interposed in circuits 1, ₁ ';
It is connected to the power supply via R ₂ '-a. In the drawing, TH is a thermoswitch that detects temperature and turns on and off.

Next, the operation of this circuit will be explained.

If you close the main switch S of the ignition electric circuit 1 now,
First, the second relay _R2 is energized and both electric circuits 1,
The a-contacts R ₂ -a and R ₂ '-a interposed at the terminal 1' are closed, and time limits are set for the prepurge timer PT and the ignition timer IT. Therefore, the combustion motors M and M' installed in both combustors a and a' rotate to scavenge air inside both combustors a and a', and the ignition transformer IG is connected to the b contact CDS-1b of the flame detector CDS.
It is activated via . Then, upon completion of the pre-purge timer PT, the contact PT-a is closed. For this purpose, safety timer ST and flame detector are installed.
CDS and electromagnetic pump P become operational. Therefore, fuel is supplied to combustor a, and ignition transformer IG
It ignites and burns due to the spark discharge from the ignition plug.

When a flame occurs, the flame detection circuit CDS detects it and its b contacts CDS-1b and CDS-2b
open. Therefore, the safety timer ST stops its operation. However, the ignition transformer IG remains energized by the contact IT-a of the ignition timer IT.

After a certain period of time has elapsed, the contact IT-a of the ignition timer IT opens, cutting off the current to the ignition transformer IG and entering a normal combustion state.

If no flame is detected within a certain period of time after the flame detection circuit CDS is energized, the safety timer ST is activated, and relay _R1 is energized to close its contact ST-a, which has intervened in relay _{R1 .} -b is switched, the power to the entire circuit 1 is cut off, and the circuit 1
The whole thing becomes inoperable.

And while one combustor a is burning, the other combustor
When the main switch S' of the other ignition electric circuit 1' is closed in order to cause combustion in the combustor a', the ignition electric circuit 1' is activated in the same manner as described above, and when the combustor a' is ignited, the ignition electric circuit 1' is activated in the same manner as described above. Ignition timer intervening in ignition transformer IG of ignition electric circuit 1 of combustor a
Contact IT'-a of IT' is also closed. Therefore, even if the wind pressure when the other combustor a' ignites reaches one combustor a and blows it out, the ignition transformer IG operates to immediately ignite and combust. can be sustained. As shown in the figure, if one combustor a is operated while the combustion blower of the other combustor a' is operated, the inconvenience of exhaust gas being discharged through the other combustor a' can be resolved. .

According to the present invention, when the ignition electric circuit of the other combustor is closed during combustion in at least one combustor, the ignition electric circuit of the combustor that is currently burning is closed in conjunction with the closing of the ignition electric circuit of the other combustor. As a result, as mentioned above, even if the combustor under combustion is blown out by the wind pressure generated when igniting the other combustor, the ignition can be immediately ignited by operating the ignition electric circuit. This has the effect of eliminating the above-mentioned inconvenience.

[Brief explanation of the drawing]

Fig. 1 is a side view of one embodiment of the present invention, and Fig. 2 is an ignition electrical circuit diagram. 1, 1' . . . ignition circuit, _a1 , a2 _. . . combustor.

Claims (1)

[Scope of utility model registration request] An ignition control circuit in a combustion device having a plurality of combustors each equipped with a separate ignition electric circuit and exhausting the exhaust from each combustor through a common exhaust pipe, which is configured so that when the ignition electric circuit of at least one combustor is closed while the other combustor is burning, the ignition control circuit of the combustor that is burning is closed in conjunction with the closing of the ignition electric circuit of the other combustor.