JPS6023253B2 - Slow ignition device for gas combustion appliances - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a gas combustor using a proportional solenoid valve, in which the ignition noise is quiet for a certain period of time and the flame does not transfer, regardless of the magnitude of the load, when the flame transfers to the main burner. The present invention provides a slow ignition device that realizes a trailing ignition operation by specifying the amount of gas to be reliably achieved.

Figure 1 shows the characteristics of time versus gas amount when the flame transfers to the conventional main burner. Since proportional control is used, the amount of gas in the main burner varies depending on the load. In the case of maximum load, Q2 gas amount is ejected. Therefore, the ignition sound is loud and close to an explosion sound. This was a problem because it caused discomfort to the user. When the load is minimum, the amount of gas ejected from the main burner is small, but it cannot be lower than the amount of gas Q, which ensures the fire transfer. Therefore, the proportional control range is between Q and Q2, and even though it would be possible to narrow down the flame by 4 degrees if fire transfer is not taken into account, it cannot be narrowed down, so the advantage of proportional control is halved. The present invention eliminates these conventional drawbacks, and embodiments thereof will be described below with reference to the drawings.

FIG. 2 shows a gas passage configuration in an embodiment of the present invention. 1 turns on the gas supply to the main burner. 1st to turn off
It is a solenoid valve.

2 is a passage that supplies the minimum amount of gas to the main burner, and is regulated by a needle 3.

4 is a proportional solenoid valve, which adjusts the gas amount depending on the load.

Reference numeral 5 denotes a second solenoid valve for ignition, which operates only within the predetermined time of the slow ignition timer.

3' is a needle provided in the passage of the second solenoid valve 5.

6 is a main burner, 7 is a pilot burner, and 8 is a solenoid valve for the main valve.

FIG. 3 shows the time-gas amount characteristics in one embodiment of the present invention.

When the original valve solenoid valve 8 and the first solenoid valve 1 open, the minimum amount of gas Q3 that has passed through the passage 2 flows. Next, since the slow ignition timer is operating, the second electromagnetic valve 5 is turned on, and gas flows from there as well, and is added to Q3 so that a total gas amount of Q flows. The amount of gas Q is defined as the amount of gas that produces a quiet ignition sound and ensures that the flame transfers. When the set time of the slow ignition timer has elapsed, the second solenoid valve 5 is turned off. At the same time, the proportional solenoid valve 4 and its control circuit operate, so that the degree of opening of the proportional solenoid valve 4 is proportionally controlled depending on the magnitude of the load, and as a result, a gas amount between Q and Q3 is produced.
Q can be made as small as possible by taking advantage of the features of proportional control. The fourth shows its control circuit.

9 is a relay contact, which turns on when the pilot flame is held.

The first solenoid valve 1, also shown in FIG. 1, is turned on because the relay contact 9 is turned on when the pilot flame is held. Reference numeral 10 designates a timer for trailing points. This timer is mainly composed of a comparator 11, and a positive input 14 defined by resistors 12 and 13 is connected to a resistor 15 and a capacitor 16.
When the negative input 17, which is charged and the potential increases, exceeds the voltage, the output of the comparator 11 changes from low to high.

This becomes the timer setting time. When the output of the comparator 11 goes high, the transistor 18 turns on and the second
Solenoid valve 5 is turned on. A proportional control section 19 drives the proportional solenoid valve 4 via transistors 21 and 22 from the proportional control circuit 2.

When the timer operates and transistor 18 turns on,
Since its collector is connected to the base of transistor Q2 via diode 23, transistor 21
, 22 are turned off, and the proportional solenoid valve 4 is also turned off.

When the timer turns off, the output of the comparator 11 changes from high to low, so the transistor 18 turns off, and the second solenoid valve 5 also turns off, and at the same time, the transistors 21 and 22 turn off.
is turned on, and the proportional solenoid valve 4 is also turned on.

Based on the above configuration, the present invention has the following effects.

{11 Since a solenoid valve is provided exclusively for ignition, slow ignition can be achieved reliably.

'2} Even when the load is small with an appliance that uses proportional control, it is possible to emit the amount of gas that will ensure a stable flame transfer regardless of the load at the time of ignition.

Therefore, since the load is small, the problem of the flame being small and not causing fire transfer does not occur. (3) If a needle is installed in the passage of the solenoid valve for trailing ignition, gas conversion can be easily accommodated.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the time-gas amount characteristics during flame transfer in a conventional example, Fig. 2 is a diagram showing the gas passage configuration in an embodiment of the present invention, and Fig. 3 is a diagram showing the time-gas amount characteristic in an embodiment of the present invention.
FIG. 4, which is a diagram showing the gas amount characteristics, is a control circuit diagram thereof. DESCRIPTION OF SYMBOLS 1...First solenoid valve, 2...Passage for supplying the minimum amount of gas, 3, 3'...Needle, 4...
...Proportional solenoid valve, 5...2nd for machine ignition
Tortoise valve, 6... Main burner, 7...
Pilot burner, 8...9 valve solenoid valve, 10.
...Timer, 19...Proportional control section, 2
0...Proportional control circuit. Figure 1 Figure 3 Figure 2 Figure 4

Claims (1)

[Claims] 1. A first solenoid valve and a proportional solenoid valve having a bypass provided in series in a gas supply path to a burner from top to bottom, and a second solenoid valve and a solenoid valve provided in parallel with the proportional solenoid valve. It consists of a control circuit that controls the first solenoid valve, and a controller that has a timer circuit that starts at the same time as energization starts and times up after a set time when the first solenoid valve is opened, and turns off the proportional solenoid valve during the operating time of the timer circuit. On the other hand, the second solenoid valve is turned on and opened, and when a time elapses, the second solenoid valve is turned off and closed, while the proportional solenoid valve is turned on and the proportional solenoid valve is controlled by the controller. A slow ignition device for gas-burning appliances. 2. A slow ignition device for a gas combustion appliance according to claim 1, wherein a needle is provided in a passage of a second solenoid valve that is parallel to the proportional solenoid valve.